drivers/scsi/ibmvscsi/ibmvfc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
   4  *
   5  * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
   6  *
   7  * Copyright (C) IBM Corporation, 2008
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/moduleparam.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/dmapool.h>
  14 #include <linux/delay.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/irqdomain.h>
  17 #include <linux/kthread.h>
  18 #include <linux/slab.h>
  19 #include <linux/of.h>
  20 #include <linux/pm.h>
  21 #include <linux/stringify.h>
  22 #include <linux/bsg-lib.h>
  23 #include <asm/firmware.h>
  24 #include <asm/irq.h>
  25 #include <asm/rtas.h>
  26 #include <asm/vio.h>
  27 #include <scsi/scsi.h>
  28 #include <scsi/scsi_cmnd.h>
  29 #include <scsi/scsi_host.h>
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_tcq.h>
  32 #include <scsi/scsi_transport_fc.h>
  33 #include <scsi/scsi_bsg_fc.h>
  34 #include "ibmvfc.h"
  35
  36 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
  37 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
  38 static u64 max_lun = IBMVFC_MAX_LUN;
  39 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
  40 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
  41 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
  42 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
  43 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
  44 static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
  45 static unsigned int mq_enabled = IBMVFC_MQ;
  46 static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES;
  47 static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS;
  48 static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ;
  49 static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M;
  50
  51 static LIST_HEAD(ibmvfc_head);
  52 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
  53 static struct scsi_transport_template *ibmvfc_transport_template;
  54
  55 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
  56 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
  57 MODULE_LICENSE("GPL");
  58 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
  59
  60 module_param_named(mq, mq_enabled, uint, S_IRUGO);
  61 MODULE_PARM_DESC(mq, "Enable multiqueue support. "
  62                  "[Default=" __stringify(IBMVFC_MQ) "]");
  63 module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO);
  64 MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. "
  65                  "[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]");
  66 module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO);
  67 MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. "
  68                  "[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]");
  69 module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO);
  70 MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. "
  71                  "[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]");
  72 module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO);
  73 MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. "
  74                  "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]");
  75
  76 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
  77 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
  78                  "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
  79 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
  80 MODULE_PARM_DESC(default_timeout,
  81                  "Default timeout in seconds for initialization and EH commands. "
  82                  "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
  83 module_param_named(max_requests, max_requests, uint, S_IRUGO);
  84 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
  85                  "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
  86 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
  87 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
  88                  "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
  89 module_param_named(max_targets, max_targets, uint, S_IRUGO);
  90 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
  91                  "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
  92 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
  93 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
  94                  "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
  95 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
  96 MODULE_PARM_DESC(debug, "Enable driver debug information. "
  97                  "[Default=" __stringify(IBMVFC_DEBUG) "]");
  98 module_param_named(log_level, log_level, uint, 0);
  99 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
 100                  "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
 101 module_param_named(cls3_error, cls3_error, uint, 0);
 102 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
 103                  "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
 104
 105 static const struct {
 106         u16 status;
 107         u16 error;
 108         u8 result;
 109         u8 retry;
 110         int log;
 111         char *name;
 112 } cmd_status [] = {
 113         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
 114         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
 115         { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
 116         { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
 117         { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
 118         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
 119         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
 120         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
 121         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
 122         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
 123         { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
 124         { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
 125         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
 126         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
 127
 128         { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
 129         { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
 130         { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
 131         { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
 132         { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
 133         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
 134         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
 135         { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
 136         { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
 137         { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
 138
 139         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
 140         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
 141         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
 142         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
 143         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
 144         { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
 145         { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
 146         { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
 147         { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
 148         { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
 149         { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
 150
 151         { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
 152         { IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
 153 };
 154
 155 static void ibmvfc_npiv_login(struct ibmvfc_host *);
 156 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 157 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 158 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
 159 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 160 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *);
 161 static void ibmvfc_tgt_move_login(struct ibmvfc_target *);
 162
 163 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *);
 164 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *);
 165
 166 static const char *unknown_error = "unknown error";
 167
 168 static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba,
 169                           unsigned long length, unsigned long *cookie,
 170                           unsigned long *irq)
 171 {
 172         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 173         long rc;
 174
 175         rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length);
 176         *cookie = retbuf[0];
 177         *irq = retbuf[1];
 178
 179         return rc;
 180 }
 181
 182 static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags)
 183 {
 184         u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities);
 185
 186         return (host_caps & cap_flags) ? 1 : 0;
 187 }
 188
 189 static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost,
 190                                                    struct ibmvfc_cmd *vfc_cmd)
 191 {
 192         if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
 193                 return &vfc_cmd->v2.iu;
 194         else
 195                 return &vfc_cmd->v1.iu;
 196 }
 197
 198 static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost,
 199                                                  struct ibmvfc_cmd *vfc_cmd)
 200 {
 201         if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
 202                 return &vfc_cmd->v2.rsp;
 203         else
 204                 return &vfc_cmd->v1.rsp;
 205 }
 206
 207 #ifdef CONFIG_SCSI_IBMVFC_TRACE
 208 /**
 209  * ibmvfc_trc_start - Log a start trace entry
 210  * @evt:                ibmvfc event struct
 211  *
 212  **/
 213 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
 214 {
 215         struct ibmvfc_host *vhost = evt->vhost;
 216         struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
 217         struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
 218         struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
 219         struct ibmvfc_trace_entry *entry;
 220         int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
 221
 222         entry = &vhost->trace[index];
 223         entry->evt = evt;
 224         entry->time = jiffies;
 225         entry->fmt = evt->crq.format;
 226         entry->type = IBMVFC_TRC_START;
 227
 228         switch (entry->fmt) {
 229         case IBMVFC_CMD_FORMAT:
 230                 entry->op_code = iu->cdb[0];
 231                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 232                 entry->lun = scsilun_to_int(&iu->lun);
 233                 entry->tmf_flags = iu->tmf_flags;
 234                 entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len);
 235                 break;
 236         case IBMVFC_MAD_FORMAT:
 237                 entry->op_code = be32_to_cpu(mad->opcode);
 238                 break;
 239         default:
 240                 break;
 241         }
 242 }
 243
 244 /**
 245  * ibmvfc_trc_end - Log an end trace entry
 246  * @evt:                ibmvfc event struct
 247  *
 248  **/
 249 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
 250 {
 251         struct ibmvfc_host *vhost = evt->vhost;
 252         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
 253         struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
 254         struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
 255         struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
 256         struct ibmvfc_trace_entry *entry;
 257         int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
 258
 259         entry = &vhost->trace[index];
 260         entry->evt = evt;
 261         entry->time = jiffies;
 262         entry->fmt = evt->crq.format;
 263         entry->type = IBMVFC_TRC_END;
 264
 265         switch (entry->fmt) {
 266         case IBMVFC_CMD_FORMAT:
 267                 entry->op_code = iu->cdb[0];
 268                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 269                 entry->lun = scsilun_to_int(&iu->lun);
 270                 entry->tmf_flags = iu->tmf_flags;
 271                 entry->u.end.status = be16_to_cpu(vfc_cmd->status);
 272                 entry->u.end.error = be16_to_cpu(vfc_cmd->error);
 273                 entry->u.end.fcp_rsp_flags = rsp->flags;
 274                 entry->u.end.rsp_code = rsp->data.info.rsp_code;
 275                 entry->u.end.scsi_status = rsp->scsi_status;
 276                 break;
 277         case IBMVFC_MAD_FORMAT:
 278                 entry->op_code = be32_to_cpu(mad->opcode);
 279                 entry->u.end.status = be16_to_cpu(mad->status);
 280                 break;
 281         default:
 282                 break;
 283
 284         }
 285 }
 286
 287 #else
 288 #define ibmvfc_trc_start(evt) do { } while (0)
 289 #define ibmvfc_trc_end(evt) do { } while (0)
 290 #endif
 291
 292 /**
 293  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 294  * @status:             status / error class
 295  * @error:              error
 296  *
 297  * Return value:
 298  *      index into cmd_status / -EINVAL on failure
 299  **/
 300 static int ibmvfc_get_err_index(u16 status, u16 error)
 301 {
 302         int i;
 303
 304         for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
 305                 if ((cmd_status[i].status & status) == cmd_status[i].status &&
 306                     cmd_status[i].error == error)
 307                         return i;
 308
 309         return -EINVAL;
 310 }
 311
 312 /**
 313  * ibmvfc_get_cmd_error - Find the error description for the fcp response
 314  * @status:             status / error class
 315  * @error:              error
 316  *
 317  * Return value:
 318  *      error description string
 319  **/
 320 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
 321 {
 322         int rc = ibmvfc_get_err_index(status, error);
 323         if (rc >= 0)
 324                 return cmd_status[rc].name;
 325         return unknown_error;
 326 }
 327
 328 /**
 329  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 330  * @vhost:      ibmvfc host struct
 331  * @vfc_cmd:    ibmvfc command struct
 332  *
 333  * Return value:
 334  *      SCSI result value to return for completed command
 335  **/
 336 static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd)
 337 {
 338         int err;
 339         struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
 340         int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
 341
 342         if ((rsp->flags & FCP_RSP_LEN_VALID) &&
 343             ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
 344              rsp->data.info.rsp_code))
 345                 return DID_ERROR << 16;
 346
 347         err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
 348         if (err >= 0)
 349                 return rsp->scsi_status | (cmd_status[err].result << 16);
 350         return rsp->scsi_status | (DID_ERROR << 16);
 351 }
 352
 353 /**
 354  * ibmvfc_retry_cmd - Determine if error status is retryable
 355  * @status:             status / error class
 356  * @error:              error
 357  *
 358  * Return value:
 359  *      1 if error should be retried / 0 if it should not
 360  **/
 361 static int ibmvfc_retry_cmd(u16 status, u16 error)
 362 {
 363         int rc = ibmvfc_get_err_index(status, error);
 364
 365         if (rc >= 0)
 366                 return cmd_status[rc].retry;
 367         return 1;
 368 }
 369
 370 static const char *unknown_fc_explain = "unknown fc explain";
 371
 372 static const struct {
 373         u16 fc_explain;
 374         char *name;
 375 } ls_explain [] = {
 376         { 0x00, "no additional explanation" },
 377         { 0x01, "service parameter error - options" },
 378         { 0x03, "service parameter error - initiator control" },
 379         { 0x05, "service parameter error - recipient control" },
 380         { 0x07, "service parameter error - received data field size" },
 381         { 0x09, "service parameter error - concurrent seq" },
 382         { 0x0B, "service parameter error - credit" },
 383         { 0x0D, "invalid N_Port/F_Port_Name" },
 384         { 0x0E, "invalid node/Fabric Name" },
 385         { 0x0F, "invalid common service parameters" },
 386         { 0x11, "invalid association header" },
 387         { 0x13, "association header required" },
 388         { 0x15, "invalid originator S_ID" },
 389         { 0x17, "invalid OX_ID-RX-ID combination" },
 390         { 0x19, "command (request) already in progress" },
 391         { 0x1E, "N_Port Login requested" },
 392         { 0x1F, "Invalid N_Port_ID" },
 393 };
 394
 395 static const struct {
 396         u16 fc_explain;
 397         char *name;
 398 } gs_explain [] = {
 399         { 0x00, "no additional explanation" },
 400         { 0x01, "port identifier not registered" },
 401         { 0x02, "port name not registered" },
 402         { 0x03, "node name not registered" },
 403         { 0x04, "class of service not registered" },
 404         { 0x06, "initial process associator not registered" },
 405         { 0x07, "FC-4 TYPEs not registered" },
 406         { 0x08, "symbolic port name not registered" },
 407         { 0x09, "symbolic node name not registered" },
 408         { 0x0A, "port type not registered" },
 409         { 0xF0, "authorization exception" },
 410         { 0xF1, "authentication exception" },
 411         { 0xF2, "data base full" },
 412         { 0xF3, "data base empty" },
 413         { 0xF4, "processing request" },
 414         { 0xF5, "unable to verify connection" },
 415         { 0xF6, "devices not in a common zone" },
 416 };
 417
 418 /**
 419  * ibmvfc_get_ls_explain - Return the FC Explain description text
 420  * @status:     FC Explain status
 421  *
 422  * Returns:
 423  *      error string
 424  **/
 425 static const char *ibmvfc_get_ls_explain(u16 status)
 426 {
 427         int i;
 428
 429         for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
 430                 if (ls_explain[i].fc_explain == status)
 431                         return ls_explain[i].name;
 432
 433         return unknown_fc_explain;
 434 }
 435
 436 /**
 437  * ibmvfc_get_gs_explain - Return the FC Explain description text
 438  * @status:     FC Explain status
 439  *
 440  * Returns:
 441  *      error string
 442  **/
 443 static const char *ibmvfc_get_gs_explain(u16 status)
 444 {
 445         int i;
 446
 447         for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
 448                 if (gs_explain[i].fc_explain == status)
 449                         return gs_explain[i].name;
 450
 451         return unknown_fc_explain;
 452 }
 453
 454 static const struct {
 455         enum ibmvfc_fc_type fc_type;
 456         char *name;
 457 } fc_type [] = {
 458         { IBMVFC_FABRIC_REJECT, "fabric reject" },
 459         { IBMVFC_PORT_REJECT, "port reject" },
 460         { IBMVFC_LS_REJECT, "ELS reject" },
 461         { IBMVFC_FABRIC_BUSY, "fabric busy" },
 462         { IBMVFC_PORT_BUSY, "port busy" },
 463         { IBMVFC_BASIC_REJECT, "basic reject" },
 464 };
 465
 466 static const char *unknown_fc_type = "unknown fc type";
 467
 468 /**
 469  * ibmvfc_get_fc_type - Return the FC Type description text
 470  * @status:     FC Type error status
 471  *
 472  * Returns:
 473  *      error string
 474  **/
 475 static const char *ibmvfc_get_fc_type(u16 status)
 476 {
 477         int i;
 478
 479         for (i = 0; i < ARRAY_SIZE(fc_type); i++)
 480                 if (fc_type[i].fc_type == status)
 481                         return fc_type[i].name;
 482
 483         return unknown_fc_type;
 484 }
 485
 486 /**
 487  * ibmvfc_set_tgt_action - Set the next init action for the target
 488  * @tgt:                ibmvfc target struct
 489  * @action:             action to perform
 490  *
 491  * Returns:
 492  *      0 if action changed / non-zero if not changed
 493  **/
 494 static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
 495                                   enum ibmvfc_target_action action)
 496 {
 497         int rc = -EINVAL;
 498
 499         switch (tgt->action) {
 500         case IBMVFC_TGT_ACTION_LOGOUT_RPORT:
 501                 if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT ||
 502                     action == IBMVFC_TGT_ACTION_DEL_RPORT) {
 503                         tgt->action = action;
 504                         rc = 0;
 505                 }
 506                 break;
 507         case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT:
 508                 if (action == IBMVFC_TGT_ACTION_DEL_RPORT ||
 509                     action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
 510                         tgt->action = action;
 511                         rc = 0;
 512                 }
 513                 break;
 514         case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT:
 515                 if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
 516                         tgt->action = action;
 517                         rc = 0;
 518                 }
 519                 break;
 520         case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT:
 521                 if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
 522                         tgt->action = action;
 523                         rc = 0;
 524                 }
 525                 break;
 526         case IBMVFC_TGT_ACTION_DEL_RPORT:
 527                 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
 528                         tgt->action = action;
 529                         rc = 0;
 530                 }
 531                 break;
 532         case IBMVFC_TGT_ACTION_DELETED_RPORT:
 533                 break;
 534         default:
 535                 tgt->action = action;
 536                 rc = 0;
 537                 break;
 538         }
 539
 540         if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT)
 541                 tgt->add_rport = 0;
 542
 543         return rc;
 544 }
 545
 546 /**
 547  * ibmvfc_set_host_state - Set the state for the host
 548  * @vhost:              ibmvfc host struct
 549  * @state:              state to set host to
 550  *
 551  * Returns:
 552  *      0 if state changed / non-zero if not changed
 553  **/
 554 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
 555                                   enum ibmvfc_host_state state)
 556 {
 557         int rc = 0;
 558
 559         switch (vhost->state) {
 560         case IBMVFC_HOST_OFFLINE:
 561                 rc = -EINVAL;
 562                 break;
 563         default:
 564                 vhost->state = state;
 565                 break;
 566         }
 567
 568         return rc;
 569 }
 570
 571 /**
 572  * ibmvfc_set_host_action - Set the next init action for the host
 573  * @vhost:              ibmvfc host struct
 574  * @action:             action to perform
 575  *
 576  **/
 577 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 578                                    enum ibmvfc_host_action action)
 579 {
 580         switch (action) {
 581         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
 582                 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
 583                         vhost->action = action;
 584                 break;
 585         case IBMVFC_HOST_ACTION_LOGO_WAIT:
 586                 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
 587                         vhost->action = action;
 588                 break;
 589         case IBMVFC_HOST_ACTION_INIT_WAIT:
 590                 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
 591                         vhost->action = action;
 592                 break;
 593         case IBMVFC_HOST_ACTION_QUERY:
 594                 switch (vhost->action) {
 595                 case IBMVFC_HOST_ACTION_INIT_WAIT:
 596                 case IBMVFC_HOST_ACTION_NONE:
 597                 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 598                         vhost->action = action;
 599                         break;
 600                 default:
 601                         break;
 602                 }
 603                 break;
 604         case IBMVFC_HOST_ACTION_TGT_INIT:
 605                 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
 606                         vhost->action = action;
 607                 break;
 608         case IBMVFC_HOST_ACTION_REENABLE:
 609         case IBMVFC_HOST_ACTION_RESET:
 610                 vhost->action = action;
 611                 break;
 612         case IBMVFC_HOST_ACTION_INIT:
 613         case IBMVFC_HOST_ACTION_TGT_DEL:
 614         case IBMVFC_HOST_ACTION_LOGO:
 615         case IBMVFC_HOST_ACTION_QUERY_TGTS:
 616         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 617         case IBMVFC_HOST_ACTION_NONE:
 618         default:
 619                 switch (vhost->action) {
 620                 case IBMVFC_HOST_ACTION_RESET:
 621                 case IBMVFC_HOST_ACTION_REENABLE:
 622                         break;
 623                 default:
 624                         vhost->action = action;
 625                         break;
 626                 }
 627                 break;
 628         }
 629 }
 630
 631 /**
 632  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 633  * @vhost:              ibmvfc host struct
 634  *
 635  * Return value:
 636  *      nothing
 637  **/
 638 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
 639 {
 640         if (vhost->action == IBMVFC_HOST_ACTION_NONE &&
 641             vhost->state == IBMVFC_ACTIVE) {
 642                 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 643                         scsi_block_requests(vhost->host);
 644                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
 645                 }
 646         } else
 647                 vhost->reinit = 1;
 648
 649         wake_up(&vhost->work_wait_q);
 650 }
 651
 652 /**
 653  * ibmvfc_del_tgt - Schedule cleanup and removal of the target
 654  * @tgt:                ibmvfc target struct
 655  **/
 656 static void ibmvfc_del_tgt(struct ibmvfc_target *tgt)
 657 {
 658         if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT)) {
 659                 tgt->job_step = ibmvfc_tgt_implicit_logout_and_del;
 660                 tgt->init_retries = 0;
 661         }
 662         wake_up(&tgt->vhost->work_wait_q);
 663 }
 664
 665 /**
 666  * ibmvfc_link_down - Handle a link down event from the adapter
 667  * @vhost:      ibmvfc host struct
 668  * @state:      ibmvfc host state to enter
 669  *
 670  **/
 671 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
 672                              enum ibmvfc_host_state state)
 673 {
 674         struct ibmvfc_target *tgt;
 675
 676         ENTER;
 677         scsi_block_requests(vhost->host);
 678         list_for_each_entry(tgt, &vhost->targets, queue)
 679                 ibmvfc_del_tgt(tgt);
 680         ibmvfc_set_host_state(vhost, state);
 681         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
 682         vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
 683         wake_up(&vhost->work_wait_q);
 684         LEAVE;
 685 }
 686
 687 /**
 688  * ibmvfc_init_host - Start host initialization
 689  * @vhost:              ibmvfc host struct
 690  *
 691  * Return value:
 692  *      nothing
 693  **/
 694 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
 695 {
 696         struct ibmvfc_target *tgt;
 697
 698         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 699                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 700                         dev_err(vhost->dev,
 701                                 "Host initialization retries exceeded. Taking adapter offline\n");
 702                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 703                         return;
 704                 }
 705         }
 706
 707         if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 708                 memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE);
 709                 vhost->async_crq.cur = 0;
 710
 711                 list_for_each_entry(tgt, &vhost->targets, queue)
 712                         ibmvfc_del_tgt(tgt);
 713                 scsi_block_requests(vhost->host);
 714                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 715                 vhost->job_step = ibmvfc_npiv_login;
 716                 wake_up(&vhost->work_wait_q);
 717         }
 718 }
 719
 720 /**
 721  * ibmvfc_send_crq - Send a CRQ
 722  * @vhost:      ibmvfc host struct
 723  * @word1:      the first 64 bits of the data
 724  * @word2:      the second 64 bits of the data
 725  *
 726  * Return value:
 727  *      0 on success / other on failure
 728  **/
 729 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
 730 {
 731         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 732         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
 733 }
 734
 735 static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1,
 736                                u64 word2, u64 word3, u64 word4)
 737 {
 738         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 739
 740         return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie,
 741                                   word1, word2, word3, word4);
 742 }
 743
 744 /**
 745  * ibmvfc_send_crq_init - Send a CRQ init message
 746  * @vhost:      ibmvfc host struct
 747  *
 748  * Return value:
 749  *      0 on success / other on failure
 750  **/
 751 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
 752 {
 753         ibmvfc_dbg(vhost, "Sending CRQ init\n");
 754         return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
 755 }
 756
 757 /**
 758  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 759  * @vhost:      ibmvfc host struct
 760  *
 761  * Return value:
 762  *      0 on success / other on failure
 763  **/
 764 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
 765 {
 766         ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
 767         return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
 768 }
 769
 770 /**
 771  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
 772  * @vhost:      ibmvfc host who owns the event pool
 773  * @queue:      ibmvfc queue struct
 774  * @size:       pool size
 775  *
 776  * Returns zero on success.
 777  **/
 778 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost,
 779                                   struct ibmvfc_queue *queue,
 780                                   unsigned int size)
 781 {
 782         int i;
 783         struct ibmvfc_event_pool *pool = &queue->evt_pool;
 784
 785         ENTER;
 786         if (!size)
 787                 return 0;
 788
 789         pool->size = size;
 790         pool->events = kcalloc(size, sizeof(*pool->events), GFP_KERNEL);
 791         if (!pool->events)
 792                 return -ENOMEM;
 793
 794         pool->iu_storage = dma_alloc_coherent(vhost->dev,
 795                                               size * sizeof(*pool->iu_storage),
 796                                               &pool->iu_token, 0);
 797
 798         if (!pool->iu_storage) {
 799                 kfree(pool->events);
 800                 return -ENOMEM;
 801         }
 802
 803         INIT_LIST_HEAD(&queue->sent);
 804         INIT_LIST_HEAD(&queue->free);
 805         spin_lock_init(&queue->l_lock);
 806
 807         for (i = 0; i < size; ++i) {
 808                 struct ibmvfc_event *evt = &pool->events[i];
 809
 810                 /*
 811                  * evt->active states
 812                  *  1 = in flight
 813                  *  0 = being completed
 814                  * -1 = free/freed
 815                  */
 816                 atomic_set(&evt->active, -1);
 817                 atomic_set(&evt->free, 1);
 818                 evt->crq.valid = 0x80;
 819                 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
 820                 evt->xfer_iu = pool->iu_storage + i;
 821                 evt->vhost = vhost;
 822                 evt->queue = queue;
 823                 evt->ext_list = NULL;
 824                 list_add_tail(&evt->queue_list, &queue->free);
 825         }
 826
 827         LEAVE;
 828         return 0;
 829 }
 830
 831 /**
 832  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
 833  * @vhost:      ibmvfc host who owns the event pool
 834  * @queue:      ibmvfc queue struct
 835  *
 836  **/
 837 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost,
 838                                    struct ibmvfc_queue *queue)
 839 {
 840         int i;
 841         struct ibmvfc_event_pool *pool = &queue->evt_pool;
 842
 843         ENTER;
 844         for (i = 0; i < pool->size; ++i) {
 845                 list_del(&pool->events[i].queue_list);
 846                 BUG_ON(atomic_read(&pool->events[i].free) != 1);
 847                 if (pool->events[i].ext_list)
 848                         dma_pool_free(vhost->sg_pool,
 849                                       pool->events[i].ext_list,
 850                                       pool->events[i].ext_list_token);
 851         }
 852
 853         kfree(pool->events);
 854         dma_free_coherent(vhost->dev,
 855                           pool->size * sizeof(*pool->iu_storage),
 856                           pool->iu_storage, pool->iu_token);
 857         LEAVE;
 858 }
 859
 860 /**
 861  * ibmvfc_free_queue - Deallocate queue
 862  * @vhost:      ibmvfc host struct
 863  * @queue:      ibmvfc queue struct
 864  *
 865  * Unmaps dma and deallocates page for messages
 866  **/
 867 static void ibmvfc_free_queue(struct ibmvfc_host *vhost,
 868                               struct ibmvfc_queue *queue)
 869 {
 870         struct device *dev = vhost->dev;
 871
 872         dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 873         free_page((unsigned long)queue->msgs.handle);
 874         queue->msgs.handle = NULL;
 875
 876         ibmvfc_free_event_pool(vhost, queue);
 877 }
 878
 879 /**
 880  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 881  * @vhost:      ibmvfc host struct
 882  *
 883  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 884  * the crq with the hypervisor.
 885  **/
 886 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 887 {
 888         long rc = 0;
 889         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 890         struct ibmvfc_queue *crq = &vhost->crq;
 891
 892         ibmvfc_dbg(vhost, "Releasing CRQ\n");
 893         free_irq(vdev->irq, vhost);
 894         tasklet_kill(&vhost->tasklet);
 895         do {
 896                 if (rc)
 897                         msleep(100);
 898                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 899         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 900
 901         vhost->state = IBMVFC_NO_CRQ;
 902         vhost->logged_in = 0;
 903
 904         ibmvfc_free_queue(vhost, crq);
 905 }
 906
 907 /**
 908  * ibmvfc_reenable_crq_queue - reenables the CRQ
 909  * @vhost:      ibmvfc host struct
 910  *
 911  * Return value:
 912  *      0 on success / other on failure
 913  **/
 914 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
 915 {
 916         int rc = 0;
 917         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 918         unsigned long flags;
 919
 920         ibmvfc_dereg_sub_crqs(vhost);
 921
 922         /* Re-enable the CRQ */
 923         do {
 924                 if (rc)
 925                         msleep(100);
 926                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
 927         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 928
 929         if (rc)
 930                 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
 931
 932         spin_lock_irqsave(vhost->host->host_lock, flags);
 933         spin_lock(vhost->crq.q_lock);
 934         vhost->do_enquiry = 1;
 935         vhost->using_channels = 0;
 936         spin_unlock(vhost->crq.q_lock);
 937         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 938
 939         ibmvfc_reg_sub_crqs(vhost);
 940
 941         return rc;
 942 }
 943
 944 /**
 945  * ibmvfc_reset_crq - resets a crq after a failure
 946  * @vhost:      ibmvfc host struct
 947  *
 948  * Return value:
 949  *      0 on success / other on failure
 950  **/
 951 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
 952 {
 953         int rc = 0;
 954         unsigned long flags;
 955         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 956         struct ibmvfc_queue *crq = &vhost->crq;
 957
 958         ibmvfc_dereg_sub_crqs(vhost);
 959
 960         /* Close the CRQ */
 961         do {
 962                 if (rc)
 963                         msleep(100);
 964                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 965         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 966
 967         spin_lock_irqsave(vhost->host->host_lock, flags);
 968         spin_lock(vhost->crq.q_lock);
 969         vhost->state = IBMVFC_NO_CRQ;
 970         vhost->logged_in = 0;
 971         vhost->do_enquiry = 1;
 972         vhost->using_channels = 0;
 973
 974         /* Clean out the queue */
 975         memset(crq->msgs.crq, 0, PAGE_SIZE);
 976         crq->cur = 0;
 977
 978         /* And re-open it again */
 979         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
 980                                 crq->msg_token, PAGE_SIZE);
 981
 982         if (rc == H_CLOSED)
 983                 /* Adapter is good, but other end is not ready */
 984                 dev_warn(vhost->dev, "Partner adapter not ready\n");
 985         else if (rc != 0)
 986                 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
 987
 988         spin_unlock(vhost->crq.q_lock);
 989         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 990
 991         ibmvfc_reg_sub_crqs(vhost);
 992
 993         return rc;
 994 }
 995
 996 /**
 997  * ibmvfc_valid_event - Determines if event is valid.
 998  * @pool:       event_pool that contains the event
 999  * @evt:        ibmvfc event to be checked for validity
1000  *
1001  * Return value:
1002  *      1 if event is valid / 0 if event is not valid
1003  **/
1004 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
1005                               struct ibmvfc_event *evt)
1006 {
1007         int index = evt - pool->events;
1008         if (index < 0 || index >= pool->size)   /* outside of bounds */
1009                 return 0;
1010         if (evt != pool->events + index)        /* unaligned */
1011                 return 0;
1012         return 1;
1013 }
1014
1015 /**
1016  * ibmvfc_free_event - Free the specified event
1017  * @evt:        ibmvfc_event to be freed
1018  *
1019  **/
1020 static void ibmvfc_free_event(struct ibmvfc_event *evt)
1021 {
1022         struct ibmvfc_event_pool *pool = &evt->queue->evt_pool;
1023         unsigned long flags;
1024
1025         BUG_ON(!ibmvfc_valid_event(pool, evt));
1026         BUG_ON(atomic_inc_return(&evt->free) != 1);
1027         BUG_ON(atomic_dec_and_test(&evt->active));
1028
1029         spin_lock_irqsave(&evt->queue->l_lock, flags);
1030         list_add_tail(&evt->queue_list, &evt->queue->free);
1031         if (evt->eh_comp)
1032                 complete(evt->eh_comp);
1033         spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1034 }
1035
1036 /**
1037  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
1038  * @evt:        ibmvfc event struct
1039  *
1040  * This function does not setup any error status, that must be done
1041  * before this function gets called.
1042  **/
1043 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
1044 {
1045         struct scsi_cmnd *cmnd = evt->cmnd;
1046
1047         if (cmnd) {
1048                 scsi_dma_unmap(cmnd);
1049                 scsi_done(cmnd);
1050         }
1051
1052         ibmvfc_free_event(evt);
1053 }
1054
1055 /**
1056  * ibmvfc_complete_purge - Complete failed command list
1057  * @purge_list:         list head of failed commands
1058  *
1059  * This function runs completions on commands to fail as a result of a
1060  * host reset or platform migration.
1061  **/
1062 static void ibmvfc_complete_purge(struct list_head *purge_list)
1063 {
1064         struct ibmvfc_event *evt, *pos;
1065
1066         list_for_each_entry_safe(evt, pos, purge_list, queue_list) {
1067                 list_del(&evt->queue_list);
1068                 ibmvfc_trc_end(evt);
1069                 evt->done(evt);
1070         }
1071 }
1072
1073 /**
1074  * ibmvfc_fail_request - Fail request with specified error code
1075  * @evt:                ibmvfc event struct
1076  * @error_code: error code to fail request with
1077  *
1078  * Return value:
1079  *      none
1080  **/
1081 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
1082 {
1083         /*
1084          * Anything we are failing should still be active. Otherwise, it
1085          * implies we already got a response for the command and are doing
1086          * something bad like double completing it.
1087          */
1088         BUG_ON(!atomic_dec_and_test(&evt->active));
1089         if (evt->cmnd) {
1090                 evt->cmnd->result = (error_code << 16);
1091                 evt->done = ibmvfc_scsi_eh_done;
1092         } else
1093                 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
1094
1095         del_timer(&evt->timer);
1096 }
1097
1098 /**
1099  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
1100  * @vhost:              ibmvfc host struct
1101  * @error_code: error code to fail requests with
1102  *
1103  * Return value:
1104  *      none
1105  **/
1106 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
1107 {
1108         struct ibmvfc_event *evt, *pos;
1109         struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
1110         unsigned long flags;
1111         int hwqs = 0;
1112         int i;
1113
1114         if (vhost->using_channels)
1115                 hwqs = vhost->scsi_scrqs.active_queues;
1116
1117         ibmvfc_dbg(vhost, "Purging all requests\n");
1118         spin_lock_irqsave(&vhost->crq.l_lock, flags);
1119         list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list)
1120                 ibmvfc_fail_request(evt, error_code);
1121         list_splice_init(&vhost->crq.sent, &vhost->purge);
1122         spin_unlock_irqrestore(&vhost->crq.l_lock, flags);
1123
1124         for (i = 0; i < hwqs; i++) {
1125                 spin_lock_irqsave(queues[i].q_lock, flags);
1126                 spin_lock(&queues[i].l_lock);
1127                 list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list)
1128                         ibmvfc_fail_request(evt, error_code);
1129                 list_splice_init(&queues[i].sent, &vhost->purge);
1130                 spin_unlock(&queues[i].l_lock);
1131                 spin_unlock_irqrestore(queues[i].q_lock, flags);
1132         }
1133 }
1134
1135 /**
1136  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
1137  * @vhost:      struct ibmvfc host to reset
1138  **/
1139 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
1140 {
1141         ibmvfc_purge_requests(vhost, DID_ERROR);
1142         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
1143         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
1144 }
1145
1146 /**
1147  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
1148  * @vhost:      struct ibmvfc host to reset
1149  **/
1150 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
1151 {
1152         if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
1153             !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
1154                 scsi_block_requests(vhost->host);
1155                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
1156                 vhost->job_step = ibmvfc_npiv_logout;
1157                 wake_up(&vhost->work_wait_q);
1158         } else
1159                 ibmvfc_hard_reset_host(vhost);
1160 }
1161
1162 /**
1163  * ibmvfc_reset_host - Reset the connection to the server
1164  * @vhost:      ibmvfc host struct
1165  **/
1166 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
1167 {
1168         unsigned long flags;
1169
1170         spin_lock_irqsave(vhost->host->host_lock, flags);
1171         __ibmvfc_reset_host(vhost);
1172         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1173 }
1174
1175 /**
1176  * ibmvfc_retry_host_init - Retry host initialization if allowed
1177  * @vhost:      ibmvfc host struct
1178  *
1179  * Returns: 1 if init will be retried / 0 if not
1180  *
1181  **/
1182 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
1183 {
1184         int retry = 0;
1185
1186         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
1187                 vhost->delay_init = 1;
1188                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
1189                         dev_err(vhost->dev,
1190                                 "Host initialization retries exceeded. Taking adapter offline\n");
1191                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
1192                 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
1193                         __ibmvfc_reset_host(vhost);
1194                 else {
1195                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
1196                         retry = 1;
1197                 }
1198         }
1199
1200         wake_up(&vhost->work_wait_q);
1201         return retry;
1202 }
1203
1204 /**
1205  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
1206  * @starget:    scsi target struct
1207  *
1208  * Return value:
1209  *      ibmvfc_target struct / NULL if not found
1210  **/
1211 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
1212 {
1213         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1214         struct ibmvfc_host *vhost = shost_priv(shost);
1215         struct ibmvfc_target *tgt;
1216
1217         list_for_each_entry(tgt, &vhost->targets, queue)
1218                 if (tgt->target_id == starget->id) {
1219                         kref_get(&tgt->kref);
1220                         return tgt;
1221                 }
1222         return NULL;
1223 }
1224
1225 /**
1226  * ibmvfc_get_target - Find the specified scsi_target
1227  * @starget:    scsi target struct
1228  *
1229  * Return value:
1230  *      ibmvfc_target struct / NULL if not found
1231  **/
1232 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
1233 {
1234         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1235         struct ibmvfc_target *tgt;
1236         unsigned long flags;
1237
1238         spin_lock_irqsave(shost->host_lock, flags);
1239         tgt = __ibmvfc_get_target(starget);
1240         spin_unlock_irqrestore(shost->host_lock, flags);
1241         return tgt;
1242 }
1243
1244 /**
1245  * ibmvfc_get_host_speed - Get host port speed
1246  * @shost:              scsi host struct
1247  *
1248  * Return value:
1249  *      none
1250  **/
1251 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
1252 {
1253         struct ibmvfc_host *vhost = shost_priv(shost);
1254         unsigned long flags;
1255
1256         spin_lock_irqsave(shost->host_lock, flags);
1257         if (vhost->state == IBMVFC_ACTIVE) {
1258                 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
1259                 case 1:
1260                         fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
1261                         break;
1262                 case 2:
1263                         fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
1264                         break;
1265                 case 4:
1266                         fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
1267                         break;
1268                 case 8:
1269                         fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
1270                         break;
1271                 case 10:
1272                         fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
1273                         break;
1274                 case 16:
1275                         fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
1276                         break;
1277                 default:
1278                         ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
1279                                    be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
1280                         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1281                         break;
1282                 }
1283         } else
1284                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1285         spin_unlock_irqrestore(shost->host_lock, flags);
1286 }
1287
1288 /**
1289  * ibmvfc_get_host_port_state - Get host port state
1290  * @shost:              scsi host struct
1291  *
1292  * Return value:
1293  *      none
1294  **/
1295 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1296 {
1297         struct ibmvfc_host *vhost = shost_priv(shost);
1298         unsigned long flags;
1299
1300         spin_lock_irqsave(shost->host_lock, flags);
1301         switch (vhost->state) {
1302         case IBMVFC_INITIALIZING:
1303         case IBMVFC_ACTIVE:
1304                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1305                 break;
1306         case IBMVFC_LINK_DOWN:
1307                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1308                 break;
1309         case IBMVFC_LINK_DEAD:
1310         case IBMVFC_HOST_OFFLINE:
1311                 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1312                 break;
1313         case IBMVFC_HALTED:
1314                 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1315                 break;
1316         case IBMVFC_NO_CRQ:
1317                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1318                 break;
1319         default:
1320                 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1321                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1322                 break;
1323         }
1324         spin_unlock_irqrestore(shost->host_lock, flags);
1325 }
1326
1327 /**
1328  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1329  * @rport:              rport struct
1330  * @timeout:    timeout value
1331  *
1332  * Return value:
1333  *      none
1334  **/
1335 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1336 {
1337         if (timeout)
1338                 rport->dev_loss_tmo = timeout;
1339         else
1340                 rport->dev_loss_tmo = 1;
1341 }
1342
1343 /**
1344  * ibmvfc_release_tgt - Free memory allocated for a target
1345  * @kref:               kref struct
1346  *
1347  **/
1348 static void ibmvfc_release_tgt(struct kref *kref)
1349 {
1350         struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1351         kfree(tgt);
1352 }
1353
1354 /**
1355  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1356  * @starget:    scsi target struct
1357  *
1358  * Return value:
1359  *      none
1360  **/
1361 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1362 {
1363         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1364         fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1365         if (tgt)
1366                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1367 }
1368
1369 /**
1370  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1371  * @starget:    scsi target struct
1372  *
1373  * Return value:
1374  *      none
1375  **/
1376 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1377 {
1378         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1379         fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1380         if (tgt)
1381                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1382 }
1383
1384 /**
1385  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1386  * @starget:    scsi target struct
1387  *
1388  * Return value:
1389  *      none
1390  **/
1391 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1392 {
1393         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1394         fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1395         if (tgt)
1396                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1397 }
1398
1399 /**
1400  * ibmvfc_wait_while_resetting - Wait while the host resets
1401  * @vhost:              ibmvfc host struct
1402  *
1403  * Return value:
1404  *      0 on success / other on failure
1405  **/
1406 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1407 {
1408         long timeout = wait_event_timeout(vhost->init_wait_q,
1409                                           ((vhost->state == IBMVFC_ACTIVE ||
1410                                             vhost->state == IBMVFC_HOST_OFFLINE ||
1411                                             vhost->state == IBMVFC_LINK_DEAD) &&
1412                                            vhost->action == IBMVFC_HOST_ACTION_NONE),
1413                                           (init_timeout * HZ));
1414
1415         return timeout ? 0 : -EIO;
1416 }
1417
1418 /**
1419  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1420  * @shost:              scsi host struct
1421  *
1422  * Return value:
1423  *      0 on success / other on failure
1424  **/
1425 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1426 {
1427         struct ibmvfc_host *vhost = shost_priv(shost);
1428
1429         dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1430         ibmvfc_reset_host(vhost);
1431         return ibmvfc_wait_while_resetting(vhost);
1432 }
1433
1434 /**
1435  * ibmvfc_gather_partition_info - Gather info about the LPAR
1436  * @vhost:      ibmvfc host struct
1437  *
1438  * Return value:
1439  *      none
1440  **/
1441 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1442 {
1443         struct device_node *rootdn;
1444         const char *name;
1445         const unsigned int *num;
1446
1447         rootdn = of_find_node_by_path("/");
1448         if (!rootdn)
1449                 return;
1450
1451         name = of_get_property(rootdn, "ibm,partition-name", NULL);
1452         if (name)
1453                 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1454         num = of_get_property(rootdn, "ibm,partition-no", NULL);
1455         if (num)
1456                 vhost->partition_number = *num;
1457         of_node_put(rootdn);
1458 }
1459
1460 /**
1461  * ibmvfc_set_login_info - Setup info for NPIV login
1462  * @vhost:      ibmvfc host struct
1463  *
1464  * Return value:
1465  *      none
1466  **/
1467 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1468 {
1469         struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1470         struct ibmvfc_queue *async_crq = &vhost->async_crq;
1471         struct device_node *of_node = vhost->dev->of_node;
1472         const char *location;
1473
1474         memset(login_info, 0, sizeof(*login_info));
1475
1476         login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1477         login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1478         login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1479         login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1480         login_info->partition_num = cpu_to_be32(vhost->partition_number);
1481         login_info->vfc_frame_version = cpu_to_be32(1);
1482         login_info->fcp_version = cpu_to_be16(3);
1483         login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1484         if (vhost->client_migrated)
1485                 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1486
1487         login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
1488         login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN);
1489
1490         if (vhost->mq_enabled || vhost->using_channels)
1491                 login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS);
1492
1493         login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1494         login_info->async.len = cpu_to_be32(async_crq->size *
1495                                             sizeof(*async_crq->msgs.async));
1496         strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1497         strncpy(login_info->device_name,
1498                 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1499
1500         location = of_get_property(of_node, "ibm,loc-code", NULL);
1501         location = location ? location : dev_name(vhost->dev);
1502         strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1503 }
1504
1505 /**
1506  * ibmvfc_get_event - Gets the next free event in pool
1507  * @queue:      ibmvfc queue struct
1508  *
1509  * Returns a free event from the pool.
1510  **/
1511 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_queue *queue)
1512 {
1513         struct ibmvfc_event *evt;
1514         unsigned long flags;
1515
1516         spin_lock_irqsave(&queue->l_lock, flags);
1517         BUG_ON(list_empty(&queue->free));
1518         evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1519         atomic_set(&evt->free, 0);
1520         list_del(&evt->queue_list);
1521         spin_unlock_irqrestore(&queue->l_lock, flags);
1522         return evt;
1523 }
1524
1525 /**
1526  * ibmvfc_locked_done - Calls evt completion with host_lock held
1527  * @evt:        ibmvfc evt to complete
1528  *
1529  * All non-scsi command completion callbacks have the expectation that the
1530  * host_lock is held. This callback is used by ibmvfc_init_event to wrap a
1531  * MAD evt with the host_lock.
1532  **/
1533 static void ibmvfc_locked_done(struct ibmvfc_event *evt)
1534 {
1535         unsigned long flags;
1536
1537         spin_lock_irqsave(evt->vhost->host->host_lock, flags);
1538         evt->_done(evt);
1539         spin_unlock_irqrestore(evt->vhost->host->host_lock, flags);
1540 }
1541
1542 /**
1543  * ibmvfc_init_event - Initialize fields in an event struct that are always
1544  *                              required.
1545  * @evt:        The event
1546  * @done:       Routine to call when the event is responded to
1547  * @format:     SRP or MAD format
1548  **/
1549 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1550                               void (*done) (struct ibmvfc_event *), u8 format)
1551 {
1552         evt->cmnd = NULL;
1553         evt->sync_iu = NULL;
1554         evt->eh_comp = NULL;
1555         evt->crq.format = format;
1556         if (format == IBMVFC_CMD_FORMAT)
1557                 evt->done = done;
1558         else {
1559                 evt->_done = done;
1560                 evt->done = ibmvfc_locked_done;
1561         }
1562         evt->hwq = 0;
1563 }
1564
1565 /**
1566  * ibmvfc_map_sg_list - Initialize scatterlist
1567  * @scmd:       scsi command struct
1568  * @nseg:       number of scatterlist segments
1569  * @md: memory descriptor list to initialize
1570  **/
1571 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1572                                struct srp_direct_buf *md)
1573 {
1574         int i;
1575         struct scatterlist *sg;
1576
1577         scsi_for_each_sg(scmd, sg, nseg, i) {
1578                 md[i].va = cpu_to_be64(sg_dma_address(sg));
1579                 md[i].len = cpu_to_be32(sg_dma_len(sg));
1580                 md[i].key = 0;
1581         }
1582 }
1583
1584 /**
1585  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields
1586  * @scmd:               struct scsi_cmnd with the scatterlist
1587  * @evt:                ibmvfc event struct
1588  * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1589  * @dev:                device for which to map dma memory
1590  *
1591  * Returns:
1592  *      0 on success / non-zero on failure
1593  **/
1594 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1595                               struct ibmvfc_event *evt,
1596                               struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1597 {
1598
1599         int sg_mapped;
1600         struct srp_direct_buf *data = &vfc_cmd->ioba;
1601         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1602         struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(evt->vhost, vfc_cmd);
1603
1604         if (cls3_error)
1605                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1606
1607         sg_mapped = scsi_dma_map(scmd);
1608         if (!sg_mapped) {
1609                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1610                 return 0;
1611         } else if (unlikely(sg_mapped < 0)) {
1612                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1613                         scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1614                 return sg_mapped;
1615         }
1616
1617         if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1618                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1619                 iu->add_cdb_len |= IBMVFC_WRDATA;
1620         } else {
1621                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1622                 iu->add_cdb_len |= IBMVFC_RDDATA;
1623         }
1624
1625         if (sg_mapped == 1) {
1626                 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1627                 return 0;
1628         }
1629
1630         vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1631
1632         if (!evt->ext_list) {
1633                 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1634                                                &evt->ext_list_token);
1635
1636                 if (!evt->ext_list) {
1637                         scsi_dma_unmap(scmd);
1638                         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1639                                 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1640                         return -ENOMEM;
1641                 }
1642         }
1643
1644         ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1645
1646         data->va = cpu_to_be64(evt->ext_list_token);
1647         data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1648         data->key = 0;
1649         return 0;
1650 }
1651
1652 /**
1653  * ibmvfc_timeout - Internal command timeout handler
1654  * @t:  struct ibmvfc_event that timed out
1655  *
1656  * Called when an internally generated command times out
1657  **/
1658 static void ibmvfc_timeout(struct timer_list *t)
1659 {
1660         struct ibmvfc_event *evt = from_timer(evt, t, timer);
1661         struct ibmvfc_host *vhost = evt->vhost;
1662         dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1663         ibmvfc_reset_host(vhost);
1664 }
1665
1666 /**
1667  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1668  * @evt:                event to be sent
1669  * @vhost:              ibmvfc host struct
1670  * @timeout:    timeout in seconds - 0 means do not time command
1671  *
1672  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1673  **/
1674 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1675                              struct ibmvfc_host *vhost, unsigned long timeout)
1676 {
1677         __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1678         unsigned long flags;
1679         int rc;
1680
1681         /* Copy the IU into the transfer area */
1682         *evt->xfer_iu = evt->iu;
1683         if (evt->crq.format == IBMVFC_CMD_FORMAT)
1684                 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1685         else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1686                 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1687         else
1688                 BUG();
1689
1690         timer_setup(&evt->timer, ibmvfc_timeout, 0);
1691
1692         if (timeout) {
1693                 evt->timer.expires = jiffies + (timeout * HZ);
1694                 add_timer(&evt->timer);
1695         }
1696
1697         spin_lock_irqsave(&evt->queue->l_lock, flags);
1698         list_add_tail(&evt->queue_list, &evt->queue->sent);
1699         atomic_set(&evt->active, 1);
1700
1701         mb();
1702
1703         if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT)
1704                 rc = ibmvfc_send_sub_crq(vhost,
1705                                          evt->queue->vios_cookie,
1706                                          be64_to_cpu(crq_as_u64[0]),
1707                                          be64_to_cpu(crq_as_u64[1]),
1708                                          0, 0);
1709         else
1710                 rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1711                                      be64_to_cpu(crq_as_u64[1]));
1712
1713         if (rc) {
1714                 atomic_set(&evt->active, 0);
1715                 list_del(&evt->queue_list);
1716                 spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1717                 del_timer(&evt->timer);
1718
1719                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1720                  * Firmware will send a CRQ with a transport event (0xFF) to
1721                  * tell this client what has happened to the transport. This
1722                  * will be handled in ibmvfc_handle_crq()
1723                  */
1724                 if (rc == H_CLOSED) {
1725                         if (printk_ratelimit())
1726                                 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1727                         if (evt->cmnd)
1728                                 scsi_dma_unmap(evt->cmnd);
1729                         ibmvfc_free_event(evt);
1730                         return SCSI_MLQUEUE_HOST_BUSY;
1731                 }
1732
1733                 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1734                 if (evt->cmnd) {
1735                         evt->cmnd->result = DID_ERROR << 16;
1736                         evt->done = ibmvfc_scsi_eh_done;
1737                 } else
1738                         evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1739
1740                 evt->done(evt);
1741         } else {
1742                 spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1743                 ibmvfc_trc_start(evt);
1744         }
1745
1746         return 0;
1747 }
1748
1749 /**
1750  * ibmvfc_log_error - Log an error for the failed command if appropriate
1751  * @evt:        ibmvfc event to log
1752  *
1753  **/
1754 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1755 {
1756         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1757         struct ibmvfc_host *vhost = evt->vhost;
1758         struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1759         struct scsi_cmnd *cmnd = evt->cmnd;
1760         const char *err = unknown_error;
1761         int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1762         int logerr = 0;
1763         int rsp_code = 0;
1764
1765         if (index >= 0) {
1766                 logerr = cmd_status[index].log;
1767                 err = cmd_status[index].name;
1768         }
1769
1770         if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1771                 return;
1772
1773         if (rsp->flags & FCP_RSP_LEN_VALID)
1774                 rsp_code = rsp->data.info.rsp_code;
1775
1776         scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) "
1777                     "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1778                     cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error),
1779                     rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1780 }
1781
1782 /**
1783  * ibmvfc_relogin - Log back into the specified device
1784  * @sdev:       scsi device struct
1785  *
1786  **/
1787 static void ibmvfc_relogin(struct scsi_device *sdev)
1788 {
1789         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1790         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1791         struct ibmvfc_target *tgt;
1792         unsigned long flags;
1793
1794         spin_lock_irqsave(vhost->host->host_lock, flags);
1795         list_for_each_entry(tgt, &vhost->targets, queue) {
1796                 if (rport == tgt->rport) {
1797                         ibmvfc_del_tgt(tgt);
1798                         break;
1799                 }
1800         }
1801
1802         ibmvfc_reinit_host(vhost);
1803         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1804 }
1805
1806 /**
1807  * ibmvfc_scsi_done - Handle responses from commands
1808  * @evt:        ibmvfc event to be handled
1809  *
1810  * Used as a callback when sending scsi cmds.
1811  **/
1812 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1813 {
1814         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1815         struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(evt->vhost, vfc_cmd);
1816         struct scsi_cmnd *cmnd = evt->cmnd;
1817         u32 rsp_len = 0;
1818         u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1819
1820         if (cmnd) {
1821                 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1822                         scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1823                 else if (rsp->flags & FCP_RESID_UNDER)
1824                         scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1825                 else
1826                         scsi_set_resid(cmnd, 0);
1827
1828                 if (vfc_cmd->status) {
1829                         cmnd->result = ibmvfc_get_err_result(evt->vhost, vfc_cmd);
1830
1831                         if (rsp->flags & FCP_RSP_LEN_VALID)
1832                                 rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1833                         if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1834                                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1835                         if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1836                                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1837                         if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1838                             (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1839                                 ibmvfc_relogin(cmnd->device);
1840
1841                         if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1842                                 cmnd->result = (DID_ERROR << 16);
1843
1844                         ibmvfc_log_error(evt);
1845                 }
1846
1847                 if (!cmnd->result &&
1848                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1849                         cmnd->result = (DID_ERROR << 16);
1850
1851                 scsi_dma_unmap(cmnd);
1852                 scsi_done(cmnd);
1853         }
1854
1855         ibmvfc_free_event(evt);
1856 }
1857
1858 /**
1859  * ibmvfc_host_chkready - Check if the host can accept commands
1860  * @vhost:       struct ibmvfc host
1861  *
1862  * Returns:
1863  *      1 if host can accept command / 0 if not
1864  **/
1865 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1866 {
1867         int result = 0;
1868
1869         switch (vhost->state) {
1870         case IBMVFC_LINK_DEAD:
1871         case IBMVFC_HOST_OFFLINE:
1872                 result = DID_NO_CONNECT << 16;
1873                 break;
1874         case IBMVFC_NO_CRQ:
1875         case IBMVFC_INITIALIZING:
1876         case IBMVFC_HALTED:
1877         case IBMVFC_LINK_DOWN:
1878                 result = DID_REQUEUE << 16;
1879                 break;
1880         case IBMVFC_ACTIVE:
1881                 result = 0;
1882                 break;
1883         }
1884
1885         return result;
1886 }
1887
1888 static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev)
1889 {
1890         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1891         struct ibmvfc_host *vhost = evt->vhost;
1892         struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
1893         struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1894         struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1895         size_t offset;
1896
1897         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1898         if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
1899                 offset = offsetof(struct ibmvfc_cmd, v2.rsp);
1900                 vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name);
1901         } else
1902                 offset = offsetof(struct ibmvfc_cmd, v1.rsp);
1903         vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset);
1904         vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp));
1905         vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1906         vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu));
1907         vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp));
1908         vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1909         vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1910         int_to_scsilun(sdev->lun, &iu->lun);
1911
1912         return vfc_cmd;
1913 }
1914
1915 /**
1916  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1917  * @shost:      scsi host struct
1918  * @cmnd:       struct scsi_cmnd to be executed
1919  *
1920  * Returns:
1921  *      0 on success / other on failure
1922  **/
1923 static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
1924 {
1925         struct ibmvfc_host *vhost = shost_priv(shost);
1926         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1927         struct ibmvfc_cmd *vfc_cmd;
1928         struct ibmvfc_fcp_cmd_iu *iu;
1929         struct ibmvfc_event *evt;
1930         u32 tag_and_hwq = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
1931         u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq);
1932         u16 scsi_channel;
1933         int rc;
1934
1935         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1936             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1937                 cmnd->result = rc;
1938                 scsi_done(cmnd);
1939                 return 0;
1940         }
1941
1942         cmnd->result = (DID_OK << 16);
1943         if (vhost->using_channels) {
1944                 scsi_channel = hwq % vhost->scsi_scrqs.active_queues;
1945                 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]);
1946                 evt->hwq = hwq % vhost->scsi_scrqs.active_queues;
1947         } else
1948                 evt = ibmvfc_get_event(&vhost->crq);
1949
1950         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1951         evt->cmnd = cmnd;
1952
1953         vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device);
1954         iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1955
1956         iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1957         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
1958
1959         if (cmnd->flags & SCMD_TAGGED) {
1960                 vfc_cmd->task_tag = cpu_to_be64(scsi_cmd_to_rq(cmnd)->tag);
1961                 iu->pri_task_attr = IBMVFC_SIMPLE_TASK;
1962         }
1963
1964         vfc_cmd->correlation = cpu_to_be64((u64)evt);
1965
1966         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1967                 return ibmvfc_send_event(evt, vhost, 0);
1968
1969         ibmvfc_free_event(evt);
1970         if (rc == -ENOMEM)
1971                 return SCSI_MLQUEUE_HOST_BUSY;
1972
1973         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1974                 scmd_printk(KERN_ERR, cmnd,
1975                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1976
1977         cmnd->result = DID_ERROR << 16;
1978         scsi_done(cmnd);
1979         return 0;
1980 }
1981
1982 /**
1983  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1984  * @evt:        ibmvfc event struct
1985  *
1986  **/
1987 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1988 {
1989         /* copy the response back */
1990         if (evt->sync_iu)
1991                 *evt->sync_iu = *evt->xfer_iu;
1992
1993         complete(&evt->comp);
1994 }
1995
1996 /**
1997  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1998  * @evt:        struct ibmvfc_event
1999  *
2000  **/
2001 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
2002 {
2003         struct ibmvfc_host *vhost = evt->vhost;
2004
2005         ibmvfc_free_event(evt);
2006         vhost->aborting_passthru = 0;
2007         dev_info(vhost->dev, "Passthru command cancelled\n");
2008 }
2009
2010 /**
2011  * ibmvfc_bsg_timeout - Handle a BSG timeout
2012  * @job:        struct bsg_job that timed out
2013  *
2014  * Returns:
2015  *      0 on success / other on failure
2016  **/
2017 static int ibmvfc_bsg_timeout(struct bsg_job *job)
2018 {
2019         struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2020         unsigned long port_id = (unsigned long)job->dd_data;
2021         struct ibmvfc_event *evt;
2022         struct ibmvfc_tmf *tmf;
2023         unsigned long flags;
2024         int rc;
2025
2026         ENTER;
2027         spin_lock_irqsave(vhost->host->host_lock, flags);
2028         if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
2029                 __ibmvfc_reset_host(vhost);
2030                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2031                 return 0;
2032         }
2033
2034         vhost->aborting_passthru = 1;
2035         evt = ibmvfc_get_event(&vhost->crq);
2036         ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
2037
2038         tmf = &evt->iu.tmf;
2039         memset(tmf, 0, sizeof(*tmf));
2040         tmf->common.version = cpu_to_be32(1);
2041         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2042         tmf->common.length = cpu_to_be16(sizeof(*tmf));
2043         tmf->scsi_id = cpu_to_be64(port_id);
2044         tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2045         tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
2046         rc = ibmvfc_send_event(evt, vhost, default_timeout);
2047
2048         if (rc != 0) {
2049                 vhost->aborting_passthru = 0;
2050                 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
2051                 rc = -EIO;
2052         } else
2053                 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
2054                          port_id);
2055
2056         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2057
2058         LEAVE;
2059         return rc;
2060 }
2061
2062 /**
2063  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
2064  * @vhost:              struct ibmvfc_host to send command
2065  * @port_id:    port ID to send command
2066  *
2067  * Returns:
2068  *      0 on success / other on failure
2069  **/
2070 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
2071 {
2072         struct ibmvfc_port_login *plogi;
2073         struct ibmvfc_target *tgt;
2074         struct ibmvfc_event *evt;
2075         union ibmvfc_iu rsp_iu;
2076         unsigned long flags;
2077         int rc = 0, issue_login = 1;
2078
2079         ENTER;
2080         spin_lock_irqsave(vhost->host->host_lock, flags);
2081         list_for_each_entry(tgt, &vhost->targets, queue) {
2082                 if (tgt->scsi_id == port_id) {
2083                         issue_login = 0;
2084                         break;
2085                 }
2086         }
2087
2088         if (!issue_login)
2089                 goto unlock_out;
2090         if (unlikely((rc = ibmvfc_host_chkready(vhost))))
2091                 goto unlock_out;
2092
2093         evt = ibmvfc_get_event(&vhost->crq);
2094         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2095         plogi = &evt->iu.plogi;
2096         memset(plogi, 0, sizeof(*plogi));
2097         plogi->common.version = cpu_to_be32(1);
2098         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
2099         plogi->common.length = cpu_to_be16(sizeof(*plogi));
2100         plogi->scsi_id = cpu_to_be64(port_id);
2101         evt->sync_iu = &rsp_iu;
2102         init_completion(&evt->comp);
2103
2104         rc = ibmvfc_send_event(evt, vhost, default_timeout);
2105         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2106
2107         if (rc)
2108                 return -EIO;
2109
2110         wait_for_completion(&evt->comp);
2111
2112         if (rsp_iu.plogi.common.status)
2113                 rc = -EIO;
2114
2115         spin_lock_irqsave(vhost->host->host_lock, flags);
2116         ibmvfc_free_event(evt);
2117 unlock_out:
2118         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2119         LEAVE;
2120         return rc;
2121 }
2122
2123 /**
2124  * ibmvfc_bsg_request - Handle a BSG request
2125  * @job:        struct bsg_job to be executed
2126  *
2127  * Returns:
2128  *      0 on success / other on failure
2129  **/
2130 static int ibmvfc_bsg_request(struct bsg_job *job)
2131 {
2132         struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2133         struct fc_rport *rport = fc_bsg_to_rport(job);
2134         struct ibmvfc_passthru_mad *mad;
2135         struct ibmvfc_event *evt;
2136         union ibmvfc_iu rsp_iu;
2137         unsigned long flags, port_id = -1;
2138         struct fc_bsg_request *bsg_request = job->request;
2139         struct fc_bsg_reply *bsg_reply = job->reply;
2140         unsigned int code = bsg_request->msgcode;
2141         int rc = 0, req_seg, rsp_seg, issue_login = 0;
2142         u32 fc_flags, rsp_len;
2143
2144         ENTER;
2145         bsg_reply->reply_payload_rcv_len = 0;
2146         if (rport)
2147                 port_id = rport->port_id;
2148
2149         switch (code) {
2150         case FC_BSG_HST_ELS_NOLOGIN:
2151                 port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
2152                         (bsg_request->rqst_data.h_els.port_id[1] << 8) |
2153                         bsg_request->rqst_data.h_els.port_id[2];
2154                 fallthrough;
2155         case FC_BSG_RPT_ELS:
2156                 fc_flags = IBMVFC_FC_ELS;
2157                 break;
2158         case FC_BSG_HST_CT:
2159                 issue_login = 1;
2160                 port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
2161                         (bsg_request->rqst_data.h_ct.port_id[1] << 8) |
2162                         bsg_request->rqst_data.h_ct.port_id[2];
2163                 fallthrough;
2164         case FC_BSG_RPT_CT:
2165                 fc_flags = IBMVFC_FC_CT_IU;
2166                 break;
2167         default:
2168                 return -ENOTSUPP;
2169         }
2170
2171         if (port_id == -1)
2172                 return -EINVAL;
2173         if (!mutex_trylock(&vhost->passthru_mutex))
2174                 return -EBUSY;
2175
2176         job->dd_data = (void *)port_id;
2177         req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
2178                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
2179
2180         if (!req_seg) {
2181                 mutex_unlock(&vhost->passthru_mutex);
2182                 return -ENOMEM;
2183         }
2184
2185         rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
2186                              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2187
2188         if (!rsp_seg) {
2189                 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2190                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
2191                 mutex_unlock(&vhost->passthru_mutex);
2192                 return -ENOMEM;
2193         }
2194
2195         if (req_seg > 1 || rsp_seg > 1) {
2196                 rc = -EINVAL;
2197                 goto out;
2198         }
2199
2200         if (issue_login)
2201                 rc = ibmvfc_bsg_plogi(vhost, port_id);
2202
2203         spin_lock_irqsave(vhost->host->host_lock, flags);
2204
2205         if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
2206             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
2207                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2208                 goto out;
2209         }
2210
2211         evt = ibmvfc_get_event(&vhost->crq);
2212         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2213         mad = &evt->iu.passthru;
2214
2215         memset(mad, 0, sizeof(*mad));
2216         mad->common.version = cpu_to_be32(1);
2217         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
2218         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
2219
2220         mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
2221                 offsetof(struct ibmvfc_passthru_mad, iu));
2222         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
2223
2224         mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
2225         mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
2226         mad->iu.flags = cpu_to_be32(fc_flags);
2227         mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2228
2229         mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
2230         mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
2231         mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
2232         mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
2233         mad->iu.scsi_id = cpu_to_be64(port_id);
2234         mad->iu.tag = cpu_to_be64((u64)evt);
2235         rsp_len = be32_to_cpu(mad->iu.rsp.len);
2236
2237         evt->sync_iu = &rsp_iu;
2238         init_completion(&evt->comp);
2239         rc = ibmvfc_send_event(evt, vhost, 0);
2240         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2241
2242         if (rc) {
2243                 rc = -EIO;
2244                 goto out;
2245         }
2246
2247         wait_for_completion(&evt->comp);
2248
2249         if (rsp_iu.passthru.common.status)
2250                 rc = -EIO;
2251         else
2252                 bsg_reply->reply_payload_rcv_len = rsp_len;
2253
2254         spin_lock_irqsave(vhost->host->host_lock, flags);
2255         ibmvfc_free_event(evt);
2256         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2257         bsg_reply->result = rc;
2258         bsg_job_done(job, bsg_reply->result,
2259                        bsg_reply->reply_payload_rcv_len);
2260         rc = 0;
2261 out:
2262         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2263                      job->request_payload.sg_cnt, DMA_TO_DEVICE);
2264         dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
2265                      job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2266         mutex_unlock(&vhost->passthru_mutex);
2267         LEAVE;
2268         return rc;
2269 }
2270
2271 /**
2272  * ibmvfc_reset_device - Reset the device with the specified reset type
2273  * @sdev:       scsi device to reset
2274  * @type:       reset type
2275  * @desc:       reset type description for log messages
2276  *
2277  * Returns:
2278  *      0 on success / other on failure
2279  **/
2280 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
2281 {
2282         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2283         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2284         struct ibmvfc_cmd *tmf;
2285         struct ibmvfc_event *evt = NULL;
2286         union ibmvfc_iu rsp_iu;
2287         struct ibmvfc_fcp_cmd_iu *iu;
2288         struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2289         int rsp_rc = -EBUSY;
2290         unsigned long flags;
2291         int rsp_code = 0;
2292
2293         spin_lock_irqsave(vhost->host->host_lock, flags);
2294         if (vhost->state == IBMVFC_ACTIVE) {
2295                 if (vhost->using_channels)
2296                         evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]);
2297                 else
2298                         evt = ibmvfc_get_event(&vhost->crq);
2299
2300                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2301                 tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2302                 iu = ibmvfc_get_fcp_iu(vhost, tmf);
2303
2304                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2305                 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2306                         tmf->target_wwpn = cpu_to_be64(rport->port_name);
2307                 iu->tmf_flags = type;
2308                 evt->sync_iu = &rsp_iu;
2309
2310                 init_completion(&evt->comp);
2311                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2312         }
2313         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2314
2315         if (rsp_rc != 0) {
2316                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2317                             desc, rsp_rc);
2318                 return -EIO;
2319         }
2320
2321         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2322         wait_for_completion(&evt->comp);
2323
2324         if (rsp_iu.cmd.status)
2325                 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2326
2327         if (rsp_code) {
2328                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2329                         rsp_code = fc_rsp->data.info.rsp_code;
2330
2331                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2332                             "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2333                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2334                             be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2335                             fc_rsp->scsi_status);
2336                 rsp_rc = -EIO;
2337         } else
2338                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2339
2340         spin_lock_irqsave(vhost->host->host_lock, flags);
2341         ibmvfc_free_event(evt);
2342         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2343         return rsp_rc;
2344 }
2345
2346 /**
2347  * ibmvfc_match_rport - Match function for specified remote port
2348  * @evt:        ibmvfc event struct
2349  * @rport:      device to match
2350  *
2351  * Returns:
2352  *      1 if event matches rport / 0 if event does not match rport
2353  **/
2354 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2355 {
2356         struct fc_rport *cmd_rport;
2357
2358         if (evt->cmnd) {
2359                 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2360                 if (cmd_rport == rport)
2361                         return 1;
2362         }
2363         return 0;
2364 }
2365
2366 /**
2367  * ibmvfc_match_target - Match function for specified target
2368  * @evt:        ibmvfc event struct
2369  * @device:     device to match (starget)
2370  *
2371  * Returns:
2372  *      1 if event matches starget / 0 if event does not match starget
2373  **/
2374 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2375 {
2376         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2377                 return 1;
2378         return 0;
2379 }
2380
2381 /**
2382  * ibmvfc_match_lun - Match function for specified LUN
2383  * @evt:        ibmvfc event struct
2384  * @device:     device to match (sdev)
2385  *
2386  * Returns:
2387  *      1 if event matches sdev / 0 if event does not match sdev
2388  **/
2389 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2390 {
2391         if (evt->cmnd && evt->cmnd->device == device)
2392                 return 1;
2393         return 0;
2394 }
2395
2396 /**
2397  * ibmvfc_event_is_free - Check if event is free or not
2398  * @evt:        ibmvfc event struct
2399  *
2400  * Returns:
2401  *      true / false
2402  **/
2403 static bool ibmvfc_event_is_free(struct ibmvfc_event *evt)
2404 {
2405         struct ibmvfc_event *loop_evt;
2406
2407         list_for_each_entry(loop_evt, &evt->queue->free, queue_list)
2408                 if (loop_evt == evt)
2409                         return true;
2410
2411         return false;
2412 }
2413
2414 /**
2415  * ibmvfc_wait_for_ops - Wait for ops to complete
2416  * @vhost:      ibmvfc host struct
2417  * @device:     device to match (starget or sdev)
2418  * @match:      match function
2419  *
2420  * Returns:
2421  *      SUCCESS / FAILED
2422  **/
2423 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2424                                int (*match) (struct ibmvfc_event *, void *))
2425 {
2426         struct ibmvfc_event *evt;
2427         DECLARE_COMPLETION_ONSTACK(comp);
2428         int wait, i, q_index, q_size;
2429         unsigned long flags;
2430         signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2431         struct ibmvfc_queue *queues;
2432
2433         ENTER;
2434         if (vhost->mq_enabled && vhost->using_channels) {
2435                 queues = vhost->scsi_scrqs.scrqs;
2436                 q_size = vhost->scsi_scrqs.active_queues;
2437         } else {
2438                 queues = &vhost->crq;
2439                 q_size = 1;
2440         }
2441
2442         do {
2443                 wait = 0;
2444                 spin_lock_irqsave(vhost->host->host_lock, flags);
2445                 for (q_index = 0; q_index < q_size; q_index++) {
2446                         spin_lock(&queues[q_index].l_lock);
2447                         for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2448                                 evt = &queues[q_index].evt_pool.events[i];
2449                                 if (!ibmvfc_event_is_free(evt)) {
2450                                         if (match(evt, device)) {
2451                                                 evt->eh_comp = &comp;
2452                                                 wait++;
2453                                         }
2454                                 }
2455                         }
2456                         spin_unlock(&queues[q_index].l_lock);
2457                 }
2458                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2459
2460                 if (wait) {
2461                         timeout = wait_for_completion_timeout(&comp, timeout);
2462
2463                         if (!timeout) {
2464                                 wait = 0;
2465                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2466                                 for (q_index = 0; q_index < q_size; q_index++) {
2467                                         spin_lock(&queues[q_index].l_lock);
2468                                         for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2469                                                 evt = &queues[q_index].evt_pool.events[i];
2470                                                 if (!ibmvfc_event_is_free(evt)) {
2471                                                         if (match(evt, device)) {
2472                                                                 evt->eh_comp = NULL;
2473                                                                 wait++;
2474                                                         }
2475                                                 }
2476                                         }
2477                                         spin_unlock(&queues[q_index].l_lock);
2478                                 }
2479                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2480                                 if (wait)
2481                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2482                                 LEAVE;
2483                                 return wait ? FAILED : SUCCESS;
2484                         }
2485                 }
2486         } while (wait);
2487
2488         LEAVE;
2489         return SUCCESS;
2490 }
2491
2492 static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue,
2493                                             struct scsi_device *sdev,
2494                                             int type)
2495 {
2496         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2497         struct scsi_target *starget = scsi_target(sdev);
2498         struct fc_rport *rport = starget_to_rport(starget);
2499         struct ibmvfc_event *evt;
2500         struct ibmvfc_tmf *tmf;
2501
2502         evt = ibmvfc_get_event(queue);
2503         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2504
2505         tmf = &evt->iu.tmf;
2506         memset(tmf, 0, sizeof(*tmf));
2507         if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
2508                 tmf->common.version = cpu_to_be32(2);
2509                 tmf->target_wwpn = cpu_to_be64(rport->port_name);
2510         } else {
2511                 tmf->common.version = cpu_to_be32(1);
2512         }
2513         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2514         tmf->common.length = cpu_to_be16(sizeof(*tmf));
2515         tmf->scsi_id = cpu_to_be64(rport->port_id);
2516         int_to_scsilun(sdev->lun, &tmf->lun);
2517         if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
2518                 type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2519         if (vhost->state == IBMVFC_ACTIVE)
2520                 tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2521         else
2522                 tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2523         tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2524         tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2525
2526         init_completion(&evt->comp);
2527
2528         return evt;
2529 }
2530
2531 static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type)
2532 {
2533         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2534         struct ibmvfc_event *evt, *found_evt, *temp;
2535         struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
2536         unsigned long flags;
2537         int num_hwq, i;
2538         int fail = 0;
2539         LIST_HEAD(cancelq);
2540         u16 status;
2541
2542         ENTER;
2543         spin_lock_irqsave(vhost->host->host_lock, flags);
2544         num_hwq = vhost->scsi_scrqs.active_queues;
2545         for (i = 0; i < num_hwq; i++) {
2546                 spin_lock(queues[i].q_lock);
2547                 spin_lock(&queues[i].l_lock);
2548                 found_evt = NULL;
2549                 list_for_each_entry(evt, &queues[i].sent, queue_list) {
2550                         if (evt->cmnd && evt->cmnd->device == sdev) {
2551                                 found_evt = evt;
2552                                 break;
2553                         }
2554                 }
2555                 spin_unlock(&queues[i].l_lock);
2556
2557                 if (found_evt && vhost->logged_in) {
2558                         evt = ibmvfc_init_tmf(&queues[i], sdev, type);
2559                         evt->sync_iu = &queues[i].cancel_rsp;
2560                         ibmvfc_send_event(evt, vhost, default_timeout);
2561                         list_add_tail(&evt->cancel, &cancelq);
2562                 }
2563
2564                 spin_unlock(queues[i].q_lock);
2565         }
2566         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2567
2568         if (list_empty(&cancelq)) {
2569                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2570                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2571                 return 0;
2572         }
2573
2574         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2575
2576         list_for_each_entry_safe(evt, temp, &cancelq, cancel) {
2577                 wait_for_completion(&evt->comp);
2578                 status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status);
2579                 list_del(&evt->cancel);
2580                 ibmvfc_free_event(evt);
2581
2582                 if (status != IBMVFC_MAD_SUCCESS) {
2583                         sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2584                         switch (status) {
2585                         case IBMVFC_MAD_DRIVER_FAILED:
2586                         case IBMVFC_MAD_CRQ_ERROR:
2587                         /* Host adapter most likely going through reset, return success to
2588                          * the caller will wait for the command being cancelled to get returned
2589                          */
2590                                 break;
2591                         default:
2592                                 fail = 1;
2593                                 break;
2594                         }
2595                 }
2596         }
2597
2598         if (fail)
2599                 return -EIO;
2600
2601         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2602         LEAVE;
2603         return 0;
2604 }
2605
2606 static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type)
2607 {
2608         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2609         struct ibmvfc_event *evt, *found_evt;
2610         union ibmvfc_iu rsp;
2611         int rsp_rc = -EBUSY;
2612         unsigned long flags;
2613         u16 status;
2614
2615         ENTER;
2616         found_evt = NULL;
2617         spin_lock_irqsave(vhost->host->host_lock, flags);
2618         spin_lock(&vhost->crq.l_lock);
2619         list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2620                 if (evt->cmnd && evt->cmnd->device == sdev) {
2621                         found_evt = evt;
2622                         break;
2623                 }
2624         }
2625         spin_unlock(&vhost->crq.l_lock);
2626
2627         if (!found_evt) {
2628                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2629                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2630                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2631                 return 0;
2632         }
2633
2634         if (vhost->logged_in) {
2635                 evt = ibmvfc_init_tmf(&vhost->crq, sdev, type);
2636                 evt->sync_iu = &rsp;
2637                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2638         }
2639
2640         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2641
2642         if (rsp_rc != 0) {
2643                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2644                 /* If failure is received, the host adapter is most likely going
2645                  through reset, return success so the caller will wait for the command
2646                  being cancelled to get returned */
2647                 return 0;
2648         }
2649
2650         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2651
2652         wait_for_completion(&evt->comp);
2653         status = be16_to_cpu(rsp.mad_common.status);
2654         spin_lock_irqsave(vhost->host->host_lock, flags);
2655         ibmvfc_free_event(evt);
2656         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2657
2658         if (status != IBMVFC_MAD_SUCCESS) {
2659                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2660                 switch (status) {
2661                 case IBMVFC_MAD_DRIVER_FAILED:
2662                 case IBMVFC_MAD_CRQ_ERROR:
2663                         /* Host adapter most likely going through reset, return success to
2664                          the caller will wait for the command being cancelled to get returned */
2665                         return 0;
2666                 default:
2667                         return -EIO;
2668                 };
2669         }
2670
2671         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2672         return 0;
2673 }
2674
2675 /**
2676  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2677  * @sdev:       scsi device to cancel commands
2678  * @type:       type of error recovery being performed
2679  *
2680  * This sends a cancel to the VIOS for the specified device. This does
2681  * NOT send any abort to the actual device. That must be done separately.
2682  *
2683  * Returns:
2684  *      0 on success / other on failure
2685  **/
2686 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2687 {
2688         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2689
2690         if (vhost->mq_enabled && vhost->using_channels)
2691                 return ibmvfc_cancel_all_mq(sdev, type);
2692         else
2693                 return ibmvfc_cancel_all_sq(sdev, type);
2694 }
2695
2696 /**
2697  * ibmvfc_match_key - Match function for specified cancel key
2698  * @evt:        ibmvfc event struct
2699  * @key:        cancel key to match
2700  *
2701  * Returns:
2702  *      1 if event matches key / 0 if event does not match key
2703  **/
2704 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2705 {
2706         unsigned long cancel_key = (unsigned long)key;
2707
2708         if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2709             be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2710                 return 1;
2711         return 0;
2712 }
2713
2714 /**
2715  * ibmvfc_match_evt - Match function for specified event
2716  * @evt:        ibmvfc event struct
2717  * @match:      event to match
2718  *
2719  * Returns:
2720  *      1 if event matches key / 0 if event does not match key
2721  **/
2722 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2723 {
2724         if (evt == match)
2725                 return 1;
2726         return 0;
2727 }
2728
2729 /**
2730  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2731  * @sdev:       scsi device to abort commands
2732  *
2733  * This sends an Abort Task Set to the VIOS for the specified device. This does
2734  * NOT send any cancel to the VIOS. That must be done separately.
2735  *
2736  * Returns:
2737  *      0 on success / other on failure
2738  **/
2739 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2740 {
2741         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2742         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2743         struct ibmvfc_cmd *tmf;
2744         struct ibmvfc_event *evt, *found_evt;
2745         union ibmvfc_iu rsp_iu;
2746         struct ibmvfc_fcp_cmd_iu *iu;
2747         struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2748         int rc, rsp_rc = -EBUSY;
2749         unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2750         int rsp_code = 0;
2751
2752         found_evt = NULL;
2753         spin_lock_irqsave(vhost->host->host_lock, flags);
2754         spin_lock(&vhost->crq.l_lock);
2755         list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2756                 if (evt->cmnd && evt->cmnd->device == sdev) {
2757                         found_evt = evt;
2758                         break;
2759                 }
2760         }
2761         spin_unlock(&vhost->crq.l_lock);
2762
2763         if (!found_evt) {
2764                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2765                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2766                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2767                 return 0;
2768         }
2769
2770         if (vhost->state == IBMVFC_ACTIVE) {
2771                 evt = ibmvfc_get_event(&vhost->crq);
2772                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2773                 tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2774                 iu = ibmvfc_get_fcp_iu(vhost, tmf);
2775
2776                 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2777                         tmf->target_wwpn = cpu_to_be64(rport->port_name);
2778                 iu->tmf_flags = IBMVFC_ABORT_TASK_SET;
2779                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2780                 evt->sync_iu = &rsp_iu;
2781
2782                 tmf->correlation = cpu_to_be64((u64)evt);
2783
2784                 init_completion(&evt->comp);
2785                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2786         }
2787
2788         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2789
2790         if (rsp_rc != 0) {
2791                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2792                 return -EIO;
2793         }
2794
2795         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2796         timeout = wait_for_completion_timeout(&evt->comp, timeout);
2797
2798         if (!timeout) {
2799                 rc = ibmvfc_cancel_all(sdev, 0);
2800                 if (!rc) {
2801                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2802                         if (rc == SUCCESS)
2803                                 rc = 0;
2804                 }
2805
2806                 if (rc) {
2807                         sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2808                         ibmvfc_reset_host(vhost);
2809                         rsp_rc = -EIO;
2810                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2811
2812                         if (rc == SUCCESS)
2813                                 rsp_rc = 0;
2814
2815                         rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2816                         if (rc != SUCCESS) {
2817                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2818                                 ibmvfc_hard_reset_host(vhost);
2819                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2820                                 rsp_rc = 0;
2821                         }
2822
2823                         goto out;
2824                 }
2825         }
2826
2827         if (rsp_iu.cmd.status)
2828                 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2829
2830         if (rsp_code) {
2831                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2832                         rsp_code = fc_rsp->data.info.rsp_code;
2833
2834                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2835                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2836                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2837                             be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2838                             fc_rsp->scsi_status);
2839                 rsp_rc = -EIO;
2840         } else
2841                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2842
2843 out:
2844         spin_lock_irqsave(vhost->host->host_lock, flags);
2845         ibmvfc_free_event(evt);
2846         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2847         return rsp_rc;
2848 }
2849
2850 /**
2851  * ibmvfc_eh_abort_handler - Abort a command
2852  * @cmd:        scsi command to abort
2853  *
2854  * Returns:
2855  *      SUCCESS / FAST_IO_FAIL / FAILED
2856  **/
2857 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2858 {
2859         struct scsi_device *sdev = cmd->device;
2860         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2861         int cancel_rc, block_rc;
2862         int rc = FAILED;
2863
2864         ENTER;
2865         block_rc = fc_block_scsi_eh(cmd);
2866         ibmvfc_wait_while_resetting(vhost);
2867         if (block_rc != FAST_IO_FAIL) {
2868                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2869                 ibmvfc_abort_task_set(sdev);
2870         } else
2871                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2872
2873         if (!cancel_rc)
2874                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2875
2876         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2877                 rc = FAST_IO_FAIL;
2878
2879         LEAVE;
2880         return rc;
2881 }
2882
2883 /**
2884  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2885  * @cmd:        scsi command struct
2886  *
2887  * Returns:
2888  *      SUCCESS / FAST_IO_FAIL / FAILED
2889  **/
2890 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2891 {
2892         struct scsi_device *sdev = cmd->device;
2893         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2894         int cancel_rc, block_rc, reset_rc = 0;
2895         int rc = FAILED;
2896
2897         ENTER;
2898         block_rc = fc_block_scsi_eh(cmd);
2899         ibmvfc_wait_while_resetting(vhost);
2900         if (block_rc != FAST_IO_FAIL) {
2901                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2902                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2903         } else
2904                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2905
2906         if (!cancel_rc && !reset_rc)
2907                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2908
2909         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2910                 rc = FAST_IO_FAIL;
2911
2912         LEAVE;
2913         return rc;
2914 }
2915
2916 /**
2917  * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2918  * @sdev:       scsi device struct
2919  * @data:       return code
2920  *
2921  **/
2922 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2923 {
2924         unsigned long *rc = data;
2925         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2926 }
2927
2928 /**
2929  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2930  * @sdev:       scsi device struct
2931  * @data:       return code
2932  *
2933  **/
2934 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2935 {
2936         unsigned long *rc = data;
2937         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2938 }
2939
2940 /**
2941  * ibmvfc_eh_target_reset_handler - Reset the target
2942  * @cmd:        scsi command struct
2943  *
2944  * Returns:
2945  *      SUCCESS / FAST_IO_FAIL / FAILED
2946  **/
2947 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2948 {
2949         struct scsi_device *sdev = cmd->device;
2950         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2951         struct scsi_target *starget = scsi_target(sdev);
2952         int block_rc;
2953         int reset_rc = 0;
2954         int rc = FAILED;
2955         unsigned long cancel_rc = 0;
2956
2957         ENTER;
2958         block_rc = fc_block_scsi_eh(cmd);
2959         ibmvfc_wait_while_resetting(vhost);
2960         if (block_rc != FAST_IO_FAIL) {
2961                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2962                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2963         } else
2964                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2965
2966         if (!cancel_rc && !reset_rc)
2967                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2968
2969         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2970                 rc = FAST_IO_FAIL;
2971
2972         LEAVE;
2973         return rc;
2974 }
2975
2976 /**
2977  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2978  * @cmd:        struct scsi_cmnd having problems
2979  *
2980  **/
2981 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2982 {
2983         int rc;
2984         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2985
2986         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2987         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2988
2989         return rc ? FAILED : SUCCESS;
2990 }
2991
2992 /**
2993  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2994  * @rport:              rport struct
2995  *
2996  * Return value:
2997  *      none
2998  **/
2999 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
3000 {
3001         struct Scsi_Host *shost = rport_to_shost(rport);
3002         struct ibmvfc_host *vhost = shost_priv(shost);
3003         struct fc_rport *dev_rport;
3004         struct scsi_device *sdev;
3005         struct ibmvfc_target *tgt;
3006         unsigned long rc, flags;
3007         unsigned int found;
3008
3009         ENTER;
3010         shost_for_each_device(sdev, shost) {
3011                 dev_rport = starget_to_rport(scsi_target(sdev));
3012                 if (dev_rport != rport)
3013                         continue;
3014                 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3015         }
3016
3017         rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
3018
3019         if (rc == FAILED)
3020                 ibmvfc_issue_fc_host_lip(shost);
3021
3022         spin_lock_irqsave(shost->host_lock, flags);
3023         found = 0;
3024         list_for_each_entry(tgt, &vhost->targets, queue) {
3025                 if (tgt->scsi_id == rport->port_id) {
3026                         found++;
3027                         break;
3028                 }
3029         }
3030
3031         if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
3032                 /*
3033                  * If we get here, that means we previously attempted to send
3034                  * an implicit logout to the target but it failed, most likely
3035                  * due to I/O being pending, so we need to send it again
3036                  */
3037                 ibmvfc_del_tgt(tgt);
3038                 ibmvfc_reinit_host(vhost);
3039         }
3040
3041         spin_unlock_irqrestore(shost->host_lock, flags);
3042         LEAVE;
3043 }
3044
3045 static const struct ibmvfc_async_desc ae_desc [] = {
3046         { "PLOGI",      IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3047         { "LOGO",       IBMVFC_AE_ELS_LOGO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3048         { "PRLO",       IBMVFC_AE_ELS_PRLO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3049         { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3050         { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3051         { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
3052         { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
3053         { "Link Up",    IBMVFC_AE_LINK_UP,      IBMVFC_DEFAULT_LOG_LEVEL },
3054         { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
3055         { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
3056         { "Halt",       IBMVFC_AE_HALT,         IBMVFC_DEFAULT_LOG_LEVEL },
3057         { "Resume",     IBMVFC_AE_RESUME,       IBMVFC_DEFAULT_LOG_LEVEL },
3058         { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
3059 };
3060
3061 static const struct ibmvfc_async_desc unknown_ae = {
3062         "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
3063 };
3064
3065 /**
3066  * ibmvfc_get_ae_desc - Get text description for async event
3067  * @ae: async event
3068  *
3069  **/
3070 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
3071 {
3072         int i;
3073
3074         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
3075                 if (ae_desc[i].ae == ae)
3076                         return &ae_desc[i];
3077
3078         return &unknown_ae;
3079 }
3080
3081 static const struct {
3082         enum ibmvfc_ae_link_state state;
3083         const char *desc;
3084 } link_desc [] = {
3085         { IBMVFC_AE_LS_LINK_UP,         " link up" },
3086         { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
3087         { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
3088         { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
3089 };
3090
3091 /**
3092  * ibmvfc_get_link_state - Get text description for link state
3093  * @state:      link state
3094  *
3095  **/
3096 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
3097 {
3098         int i;
3099
3100         for (i = 0; i < ARRAY_SIZE(link_desc); i++)
3101                 if (link_desc[i].state == state)
3102                         return link_desc[i].desc;
3103
3104         return "";
3105 }
3106
3107 /**
3108  * ibmvfc_handle_async - Handle an async event from the adapter
3109  * @crq:        crq to process
3110  * @vhost:      ibmvfc host struct
3111  *
3112  **/
3113 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
3114                                 struct ibmvfc_host *vhost)
3115 {
3116         const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
3117         struct ibmvfc_target *tgt;
3118
3119         ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
3120                    " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
3121                    be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
3122                    ibmvfc_get_link_state(crq->link_state));
3123
3124         switch (be64_to_cpu(crq->event)) {
3125         case IBMVFC_AE_RESUME:
3126                 switch (crq->link_state) {
3127                 case IBMVFC_AE_LS_LINK_DOWN:
3128                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3129                         break;
3130                 case IBMVFC_AE_LS_LINK_DEAD:
3131                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3132                         break;
3133                 case IBMVFC_AE_LS_LINK_UP:
3134                 case IBMVFC_AE_LS_LINK_BOUNCED:
3135                 default:
3136                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
3137                         vhost->delay_init = 1;
3138                         __ibmvfc_reset_host(vhost);
3139                         break;
3140                 }
3141
3142                 break;
3143         case IBMVFC_AE_LINK_UP:
3144                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
3145                 vhost->delay_init = 1;
3146                 __ibmvfc_reset_host(vhost);
3147                 break;
3148         case IBMVFC_AE_SCN_FABRIC:
3149         case IBMVFC_AE_SCN_DOMAIN:
3150                 vhost->events_to_log |= IBMVFC_AE_RSCN;
3151                 if (vhost->state < IBMVFC_HALTED) {
3152                         vhost->delay_init = 1;
3153                         __ibmvfc_reset_host(vhost);
3154                 }
3155                 break;
3156         case IBMVFC_AE_SCN_NPORT:
3157         case IBMVFC_AE_SCN_GROUP:
3158                 vhost->events_to_log |= IBMVFC_AE_RSCN;
3159                 ibmvfc_reinit_host(vhost);
3160                 break;
3161         case IBMVFC_AE_ELS_LOGO:
3162         case IBMVFC_AE_ELS_PRLO:
3163         case IBMVFC_AE_ELS_PLOGI:
3164                 list_for_each_entry(tgt, &vhost->targets, queue) {
3165                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
3166                                 break;
3167                         if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
3168                                 continue;
3169                         if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
3170                                 continue;
3171                         if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
3172                                 continue;
3173                         if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
3174                                 tgt->logo_rcvd = 1;
3175                         if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
3176                                 ibmvfc_del_tgt(tgt);
3177                                 ibmvfc_reinit_host(vhost);
3178                         }
3179                 }
3180                 break;
3181         case IBMVFC_AE_LINK_DOWN:
3182         case IBMVFC_AE_ADAPTER_FAILED:
3183                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3184                 break;
3185         case IBMVFC_AE_LINK_DEAD:
3186                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3187                 break;
3188         case IBMVFC_AE_HALT:
3189                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
3190                 break;
3191         default:
3192                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
3193                 break;
3194         }
3195 }
3196
3197 /**
3198  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
3199  * @crq:        Command/Response queue
3200  * @vhost:      ibmvfc host struct
3201  * @evt_doneq:  Event done queue
3202  *
3203 **/
3204 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3205                               struct list_head *evt_doneq)
3206 {
3207         long rc;
3208         struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3209
3210         switch (crq->valid) {
3211         case IBMVFC_CRQ_INIT_RSP:
3212                 switch (crq->format) {
3213                 case IBMVFC_CRQ_INIT:
3214                         dev_info(vhost->dev, "Partner initialized\n");
3215                         /* Send back a response */
3216                         rc = ibmvfc_send_crq_init_complete(vhost);
3217                         if (rc == 0)
3218                                 ibmvfc_init_host(vhost);
3219                         else
3220                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
3221                         break;
3222                 case IBMVFC_CRQ_INIT_COMPLETE:
3223                         dev_info(vhost->dev, "Partner initialization complete\n");
3224                         ibmvfc_init_host(vhost);
3225                         break;
3226                 default:
3227                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
3228                 }
3229                 return;
3230         case IBMVFC_CRQ_XPORT_EVENT:
3231                 vhost->state = IBMVFC_NO_CRQ;
3232                 vhost->logged_in = 0;
3233                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3234                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
3235                         /* We need to re-setup the interpartition connection */
3236                         dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
3237                         vhost->client_migrated = 1;
3238                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
3239                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3240                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
3241                 } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
3242                         dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
3243                         ibmvfc_purge_requests(vhost, DID_ERROR);
3244                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3245                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
3246                 } else {
3247                         dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
3248                 }
3249                 return;
3250         case IBMVFC_CRQ_CMD_RSP:
3251                 break;
3252         default:
3253                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
3254                 return;
3255         }
3256
3257         if (crq->format == IBMVFC_ASYNC_EVENT)
3258                 return;
3259
3260         /* The only kind of payload CRQs we should get are responses to
3261          * things we send. Make sure this response is to something we
3262          * actually sent
3263          */
3264         if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) {
3265                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3266                         crq->ioba);
3267                 return;
3268         }
3269
3270         if (unlikely(atomic_dec_if_positive(&evt->active))) {
3271                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3272                         crq->ioba);
3273                 return;
3274         }
3275
3276         spin_lock(&evt->queue->l_lock);
3277         list_move_tail(&evt->queue_list, evt_doneq);
3278         spin_unlock(&evt->queue->l_lock);
3279 }
3280
3281 /**
3282  * ibmvfc_scan_finished - Check if the device scan is done.
3283  * @shost:      scsi host struct
3284  * @time:       current elapsed time
3285  *
3286  * Returns:
3287  *      0 if scan is not done / 1 if scan is done
3288  **/
3289 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
3290 {
3291         unsigned long flags;
3292         struct ibmvfc_host *vhost = shost_priv(shost);
3293         int done = 0;
3294
3295         spin_lock_irqsave(shost->host_lock, flags);
3296         if (!vhost->scan_timeout)
3297                 done = 1;
3298         else if (time >= (vhost->scan_timeout * HZ)) {
3299                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
3300                          "continuing initialization\n", vhost->scan_timeout);
3301                 done = 1;
3302         }
3303
3304         if (vhost->scan_complete) {
3305                 vhost->scan_timeout = init_timeout;
3306                 done = 1;
3307         }
3308         spin_unlock_irqrestore(shost->host_lock, flags);
3309         return done;
3310 }
3311
3312 /**
3313  * ibmvfc_slave_alloc - Setup the device's task set value
3314  * @sdev:       struct scsi_device device to configure
3315  *
3316  * Set the device's task set value so that error handling works as
3317  * expected.
3318  *
3319  * Returns:
3320  *      0 on success / -ENXIO if device does not exist
3321  **/
3322 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
3323 {
3324         struct Scsi_Host *shost = sdev->host;
3325         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
3326         struct ibmvfc_host *vhost = shost_priv(shost);
3327         unsigned long flags = 0;
3328
3329         if (!rport || fc_remote_port_chkready(rport))
3330                 return -ENXIO;
3331
3332         spin_lock_irqsave(shost->host_lock, flags);
3333         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
3334         spin_unlock_irqrestore(shost->host_lock, flags);
3335         return 0;
3336 }
3337
3338 /**
3339  * ibmvfc_target_alloc - Setup the target's task set value
3340  * @starget:    struct scsi_target
3341  *
3342  * Set the target's task set value so that error handling works as
3343  * expected.
3344  *
3345  * Returns:
3346  *      0 on success / -ENXIO if device does not exist
3347  **/
3348 static int ibmvfc_target_alloc(struct scsi_target *starget)
3349 {
3350         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3351         struct ibmvfc_host *vhost = shost_priv(shost);
3352         unsigned long flags = 0;
3353
3354         spin_lock_irqsave(shost->host_lock, flags);
3355         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
3356         spin_unlock_irqrestore(shost->host_lock, flags);
3357         return 0;
3358 }
3359
3360 /**
3361  * ibmvfc_slave_configure - Configure the device
3362  * @sdev:       struct scsi_device device to configure
3363  *
3364  * Enable allow_restart for a device if it is a disk. Adjust the
3365  * queue_depth here also.
3366  *
3367  * Returns:
3368  *      0
3369  **/
3370 static int ibmvfc_slave_configure(struct scsi_device *sdev)
3371 {
3372         struct Scsi_Host *shost = sdev->host;
3373         unsigned long flags = 0;
3374
3375         spin_lock_irqsave(shost->host_lock, flags);
3376         if (sdev->type == TYPE_DISK) {
3377                 sdev->allow_restart = 1;
3378                 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
3379         }
3380         spin_unlock_irqrestore(shost->host_lock, flags);
3381         return 0;
3382 }
3383
3384 /**
3385  * ibmvfc_change_queue_depth - Change the device's queue depth
3386  * @sdev:       scsi device struct
3387  * @qdepth:     depth to set
3388  *
3389  * Return value:
3390  *      actual depth set
3391  **/
3392 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
3393 {
3394         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
3395                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
3396
3397         return scsi_change_queue_depth(sdev, qdepth);
3398 }
3399
3400 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
3401                                                  struct device_attribute *attr, char *buf)
3402 {
3403         struct Scsi_Host *shost = class_to_shost(dev);
3404         struct ibmvfc_host *vhost = shost_priv(shost);
3405
3406         return snprintf(buf, PAGE_SIZE, "%s\n",
3407                         vhost->login_buf->resp.partition_name);
3408 }
3409
3410 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
3411                                             struct device_attribute *attr, char *buf)
3412 {
3413         struct Scsi_Host *shost = class_to_shost(dev);
3414         struct ibmvfc_host *vhost = shost_priv(shost);
3415
3416         return snprintf(buf, PAGE_SIZE, "%s\n",
3417                         vhost->login_buf->resp.device_name);
3418 }
3419
3420 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
3421                                          struct device_attribute *attr, char *buf)
3422 {
3423         struct Scsi_Host *shost = class_to_shost(dev);
3424         struct ibmvfc_host *vhost = shost_priv(shost);
3425
3426         return snprintf(buf, PAGE_SIZE, "%s\n",
3427                         vhost->login_buf->resp.port_loc_code);
3428 }
3429
3430 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
3431                                          struct device_attribute *attr, char *buf)
3432 {
3433         struct Scsi_Host *shost = class_to_shost(dev);
3434         struct ibmvfc_host *vhost = shost_priv(shost);
3435
3436         return snprintf(buf, PAGE_SIZE, "%s\n",
3437                         vhost->login_buf->resp.drc_name);
3438 }
3439
3440 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
3441                                              struct device_attribute *attr, char *buf)
3442 {
3443         struct Scsi_Host *shost = class_to_shost(dev);
3444         struct ibmvfc_host *vhost = shost_priv(shost);
3445         return snprintf(buf, PAGE_SIZE, "%d\n", be32_to_cpu(vhost->login_buf->resp.version));
3446 }
3447
3448 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3449                                              struct device_attribute *attr, char *buf)
3450 {
3451         struct Scsi_Host *shost = class_to_shost(dev);
3452         struct ibmvfc_host *vhost = shost_priv(shost);
3453         return snprintf(buf, PAGE_SIZE, "%llx\n", be64_to_cpu(vhost->login_buf->resp.capabilities));
3454 }
3455
3456 /**
3457  * ibmvfc_show_log_level - Show the adapter's error logging level
3458  * @dev:        class device struct
3459  * @attr:       unused
3460  * @buf:        buffer
3461  *
3462  * Return value:
3463  *      number of bytes printed to buffer
3464  **/
3465 static ssize_t ibmvfc_show_log_level(struct device *dev,
3466                                      struct device_attribute *attr, char *buf)
3467 {
3468         struct Scsi_Host *shost = class_to_shost(dev);
3469         struct ibmvfc_host *vhost = shost_priv(shost);
3470         unsigned long flags = 0;
3471         int len;
3472
3473         spin_lock_irqsave(shost->host_lock, flags);
3474         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
3475         spin_unlock_irqrestore(shost->host_lock, flags);
3476         return len;
3477 }
3478
3479 /**
3480  * ibmvfc_store_log_level - Change the adapter's error logging level
3481  * @dev:        class device struct
3482  * @attr:       unused
3483  * @buf:        buffer
3484  * @count:      buffer size
3485  *
3486  * Return value:
3487  *      number of bytes printed to buffer
3488  **/
3489 static ssize_t ibmvfc_store_log_level(struct device *dev,
3490                                       struct device_attribute *attr,
3491                                       const char *buf, size_t count)
3492 {
3493         struct Scsi_Host *shost = class_to_shost(dev);
3494         struct ibmvfc_host *vhost = shost_priv(shost);
3495         unsigned long flags = 0;
3496
3497         spin_lock_irqsave(shost->host_lock, flags);
3498         vhost->log_level = simple_strtoul(buf, NULL, 10);
3499         spin_unlock_irqrestore(shost->host_lock, flags);
3500         return strlen(buf);
3501 }
3502
3503 static ssize_t ibmvfc_show_scsi_channels(struct device *dev,
3504                                          struct device_attribute *attr, char *buf)
3505 {
3506         struct Scsi_Host *shost = class_to_shost(dev);
3507         struct ibmvfc_host *vhost = shost_priv(shost);
3508         unsigned long flags = 0;
3509         int len;
3510
3511         spin_lock_irqsave(shost->host_lock, flags);
3512         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->client_scsi_channels);
3513         spin_unlock_irqrestore(shost->host_lock, flags);
3514         return len;
3515 }
3516
3517 static ssize_t ibmvfc_store_scsi_channels(struct device *dev,
3518                                          struct device_attribute *attr,
3519                                          const char *buf, size_t count)
3520 {
3521         struct Scsi_Host *shost = class_to_shost(dev);
3522         struct ibmvfc_host *vhost = shost_priv(shost);
3523         unsigned long flags = 0;
3524         unsigned int channels;
3525
3526         spin_lock_irqsave(shost->host_lock, flags);
3527         channels = simple_strtoul(buf, NULL, 10);
3528         vhost->client_scsi_channels = min(channels, nr_scsi_hw_queues);
3529         ibmvfc_hard_reset_host(vhost);
3530         spin_unlock_irqrestore(shost->host_lock, flags);
3531         return strlen(buf);
3532 }
3533
3534 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3535 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3536 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3537 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3538 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3539 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3540 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3541                    ibmvfc_show_log_level, ibmvfc_store_log_level);
3542 static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR,
3543                    ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels);
3544
3545 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3546 /**
3547  * ibmvfc_read_trace - Dump the adapter trace
3548  * @filp:               open sysfs file
3549  * @kobj:               kobject struct
3550  * @bin_attr:   bin_attribute struct
3551  * @buf:                buffer
3552  * @off:                offset
3553  * @count:              buffer size
3554  *
3555  * Return value:
3556  *      number of bytes printed to buffer
3557  **/
3558 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3559                                  struct bin_attribute *bin_attr,
3560                                  char *buf, loff_t off, size_t count)
3561 {
3562         struct device *dev = kobj_to_dev(kobj);
3563         struct Scsi_Host *shost = class_to_shost(dev);
3564         struct ibmvfc_host *vhost = shost_priv(shost);
3565         unsigned long flags = 0;
3566         int size = IBMVFC_TRACE_SIZE;
3567         char *src = (char *)vhost->trace;
3568
3569         if (off > size)
3570                 return 0;
3571         if (off + count > size) {
3572                 size -= off;
3573                 count = size;
3574         }
3575
3576         spin_lock_irqsave(shost->host_lock, flags);
3577         memcpy(buf, &src[off], count);
3578         spin_unlock_irqrestore(shost->host_lock, flags);
3579         return count;
3580 }
3581
3582 static struct bin_attribute ibmvfc_trace_attr = {
3583         .attr = {
3584                 .name = "trace",
3585                 .mode = S_IRUGO,
3586         },
3587         .size = 0,
3588         .read = ibmvfc_read_trace,
3589 };
3590 #endif
3591
3592 static struct attribute *ibmvfc_host_attrs[] = {
3593         &dev_attr_partition_name.attr,
3594         &dev_attr_device_name.attr,
3595         &dev_attr_port_loc_code.attr,
3596         &dev_attr_drc_name.attr,
3597         &dev_attr_npiv_version.attr,
3598         &dev_attr_capabilities.attr,
3599         &dev_attr_log_level.attr,
3600         &dev_attr_nr_scsi_channels.attr,
3601         NULL
3602 };
3603
3604 ATTRIBUTE_GROUPS(ibmvfc_host);
3605
3606 static struct scsi_host_template driver_template = {
3607         .module = THIS_MODULE,
3608         .name = "IBM POWER Virtual FC Adapter",
3609         .proc_name = IBMVFC_NAME,
3610         .queuecommand = ibmvfc_queuecommand,
3611         .eh_timed_out = fc_eh_timed_out,
3612         .eh_abort_handler = ibmvfc_eh_abort_handler,
3613         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3614         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3615         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3616         .slave_alloc = ibmvfc_slave_alloc,
3617         .slave_configure = ibmvfc_slave_configure,
3618         .target_alloc = ibmvfc_target_alloc,
3619         .scan_finished = ibmvfc_scan_finished,
3620         .change_queue_depth = ibmvfc_change_queue_depth,
3621         .cmd_per_lun = 16,
3622         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3623         .this_id = -1,
3624         .sg_tablesize = SG_ALL,
3625         .max_sectors = IBMVFC_MAX_SECTORS,
3626         .shost_groups = ibmvfc_host_groups,
3627         .track_queue_depth = 1,
3628         .host_tagset = 1,
3629 };
3630
3631 /**
3632  * ibmvfc_next_async_crq - Returns the next entry in async queue
3633  * @vhost:      ibmvfc host struct
3634  *
3635  * Returns:
3636  *      Pointer to next entry in queue / NULL if empty
3637  **/
3638 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3639 {
3640         struct ibmvfc_queue *async_crq = &vhost->async_crq;
3641         struct ibmvfc_async_crq *crq;
3642
3643         crq = &async_crq->msgs.async[async_crq->cur];
3644         if (crq->valid & 0x80) {
3645                 if (++async_crq->cur == async_crq->size)
3646                         async_crq->cur = 0;
3647                 rmb();
3648         } else
3649                 crq = NULL;
3650
3651         return crq;
3652 }
3653
3654 /**
3655  * ibmvfc_next_crq - Returns the next entry in message queue
3656  * @vhost:      ibmvfc host struct
3657  *
3658  * Returns:
3659  *      Pointer to next entry in queue / NULL if empty
3660  **/
3661 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3662 {
3663         struct ibmvfc_queue *queue = &vhost->crq;
3664         struct ibmvfc_crq *crq;
3665
3666         crq = &queue->msgs.crq[queue->cur];
3667         if (crq->valid & 0x80) {
3668                 if (++queue->cur == queue->size)
3669                         queue->cur = 0;
3670                 rmb();
3671         } else
3672                 crq = NULL;
3673
3674         return crq;
3675 }
3676
3677 /**
3678  * ibmvfc_interrupt - Interrupt handler
3679  * @irq:                number of irq to handle, not used
3680  * @dev_instance: ibmvfc_host that received interrupt
3681  *
3682  * Returns:
3683  *      IRQ_HANDLED
3684  **/
3685 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3686 {
3687         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3688         unsigned long flags;
3689
3690         spin_lock_irqsave(vhost->host->host_lock, flags);
3691         vio_disable_interrupts(to_vio_dev(vhost->dev));
3692         tasklet_schedule(&vhost->tasklet);
3693         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3694         return IRQ_HANDLED;
3695 }
3696
3697 /**
3698  * ibmvfc_tasklet - Interrupt handler tasklet
3699  * @data:               ibmvfc host struct
3700  *
3701  * Returns:
3702  *      Nothing
3703  **/
3704 static void ibmvfc_tasklet(void *data)
3705 {
3706         struct ibmvfc_host *vhost = data;
3707         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3708         struct ibmvfc_crq *crq;
3709         struct ibmvfc_async_crq *async;
3710         struct ibmvfc_event *evt, *temp;
3711         unsigned long flags;
3712         int done = 0;
3713         LIST_HEAD(evt_doneq);
3714
3715         spin_lock_irqsave(vhost->host->host_lock, flags);
3716         spin_lock(vhost->crq.q_lock);
3717         while (!done) {
3718                 /* Pull all the valid messages off the async CRQ */
3719                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3720                         ibmvfc_handle_async(async, vhost);
3721                         async->valid = 0;
3722                         wmb();
3723                 }
3724
3725                 /* Pull all the valid messages off the CRQ */
3726                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3727                         ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3728                         crq->valid = 0;
3729                         wmb();
3730                 }
3731
3732                 vio_enable_interrupts(vdev);
3733                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3734                         vio_disable_interrupts(vdev);
3735                         ibmvfc_handle_async(async, vhost);
3736                         async->valid = 0;
3737                         wmb();
3738                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3739                         vio_disable_interrupts(vdev);
3740                         ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3741                         crq->valid = 0;
3742                         wmb();
3743                 } else
3744                         done = 1;
3745         }
3746
3747         spin_unlock(vhost->crq.q_lock);
3748         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3749
3750         list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3751                 del_timer(&evt->timer);
3752                 list_del(&evt->queue_list);
3753                 ibmvfc_trc_end(evt);
3754                 evt->done(evt);
3755         }
3756 }
3757
3758 static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
3759 {
3760         struct device *dev = scrq->vhost->dev;
3761         struct vio_dev *vdev = to_vio_dev(dev);
3762         unsigned long rc;
3763         int irq_action = H_ENABLE_VIO_INTERRUPT;
3764
3765         if (!enable)
3766                 irq_action = H_DISABLE_VIO_INTERRUPT;
3767
3768         rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action,
3769                                 scrq->hw_irq, 0, 0);
3770
3771         if (rc)
3772                 dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n",
3773                         enable ? "enable" : "disable", scrq->hwq_id, rc);
3774
3775         return rc;
3776 }
3777
3778 static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3779                                struct list_head *evt_doneq)
3780 {
3781         struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3782
3783         switch (crq->valid) {
3784         case IBMVFC_CRQ_CMD_RSP:
3785                 break;
3786         case IBMVFC_CRQ_XPORT_EVENT:
3787                 return;
3788         default:
3789                 dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid);
3790                 return;
3791         }
3792
3793         /* The only kind of payload CRQs we should get are responses to
3794          * things we send. Make sure this response is to something we
3795          * actually sent
3796          */
3797         if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) {
3798                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3799                         crq->ioba);
3800                 return;
3801         }
3802
3803         if (unlikely(atomic_dec_if_positive(&evt->active))) {
3804                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3805                         crq->ioba);
3806                 return;
3807         }
3808
3809         spin_lock(&evt->queue->l_lock);
3810         list_move_tail(&evt->queue_list, evt_doneq);
3811         spin_unlock(&evt->queue->l_lock);
3812 }
3813
3814 static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq)
3815 {
3816         struct ibmvfc_crq *crq;
3817
3818         crq = &scrq->msgs.scrq[scrq->cur].crq;
3819         if (crq->valid & 0x80) {
3820                 if (++scrq->cur == scrq->size)
3821                         scrq->cur = 0;
3822                 rmb();
3823         } else
3824                 crq = NULL;
3825
3826         return crq;
3827 }
3828
3829 static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq)
3830 {
3831         struct ibmvfc_crq *crq;
3832         struct ibmvfc_event *evt, *temp;
3833         unsigned long flags;
3834         int done = 0;
3835         LIST_HEAD(evt_doneq);
3836
3837         spin_lock_irqsave(scrq->q_lock, flags);
3838         while (!done) {
3839                 while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3840                         ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3841                         crq->valid = 0;
3842                         wmb();
3843                 }
3844
3845                 ibmvfc_toggle_scrq_irq(scrq, 1);
3846                 if ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3847                         ibmvfc_toggle_scrq_irq(scrq, 0);
3848                         ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3849                         crq->valid = 0;
3850                         wmb();
3851                 } else
3852                         done = 1;
3853         }
3854         spin_unlock_irqrestore(scrq->q_lock, flags);
3855
3856         list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3857                 del_timer(&evt->timer);
3858                 list_del(&evt->queue_list);
3859                 ibmvfc_trc_end(evt);
3860                 evt->done(evt);
3861         }
3862 }
3863
3864 static irqreturn_t ibmvfc_interrupt_scsi(int irq, void *scrq_instance)
3865 {
3866         struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance;
3867
3868         ibmvfc_toggle_scrq_irq(scrq, 0);
3869         ibmvfc_drain_sub_crq(scrq);
3870
3871         return IRQ_HANDLED;
3872 }
3873
3874 /**
3875  * ibmvfc_init_tgt - Set the next init job step for the target
3876  * @tgt:                ibmvfc target struct
3877  * @job_step:   job step to perform
3878  *
3879  **/
3880 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3881                             void (*job_step) (struct ibmvfc_target *))
3882 {
3883         if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT))
3884                 tgt->job_step = job_step;
3885         wake_up(&tgt->vhost->work_wait_q);
3886 }
3887
3888 /**
3889  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3890  * @tgt:                ibmvfc target struct
3891  * @job_step:   initialization job step
3892  *
3893  * Returns: 1 if step will be retried / 0 if not
3894  *
3895  **/
3896 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3897                                   void (*job_step) (struct ibmvfc_target *))
3898 {
3899         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3900                 ibmvfc_del_tgt(tgt);
3901                 wake_up(&tgt->vhost->work_wait_q);
3902                 return 0;
3903         } else
3904                 ibmvfc_init_tgt(tgt, job_step);
3905         return 1;
3906 }
3907
3908 /* Defined in FC-LS */
3909 static const struct {
3910         int code;
3911         int retry;
3912         int logged_in;
3913 } prli_rsp [] = {
3914         { 0, 1, 0 },
3915         { 1, 0, 1 },
3916         { 2, 1, 0 },
3917         { 3, 1, 0 },
3918         { 4, 0, 0 },
3919         { 5, 0, 0 },
3920         { 6, 0, 1 },
3921         { 7, 0, 0 },
3922         { 8, 1, 0 },
3923 };
3924
3925 /**
3926  * ibmvfc_get_prli_rsp - Find PRLI response index
3927  * @flags:      PRLI response flags
3928  *
3929  **/
3930 static int ibmvfc_get_prli_rsp(u16 flags)
3931 {
3932         int i;
3933         int code = (flags & 0x0f00) >> 8;
3934
3935         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3936                 if (prli_rsp[i].code == code)
3937                         return i;
3938
3939         return 0;
3940 }
3941
3942 /**
3943  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3944  * @evt:        ibmvfc event struct
3945  *
3946  **/
3947 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3948 {
3949         struct ibmvfc_target *tgt = evt->tgt;
3950         struct ibmvfc_host *vhost = evt->vhost;
3951         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3952         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3953         u32 status = be16_to_cpu(rsp->common.status);
3954         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3955
3956         vhost->discovery_threads--;
3957         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3958         switch (status) {
3959         case IBMVFC_MAD_SUCCESS:
3960                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3961                         parms->type, parms->flags, parms->service_parms);
3962
3963                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3964                         index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3965                         if (prli_rsp[index].logged_in) {
3966                                 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3967                                         tgt->need_login = 0;
3968                                         tgt->ids.roles = 0;
3969                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3970                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3971                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3972                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3973                                         tgt->add_rport = 1;
3974                                 } else
3975                                         ibmvfc_del_tgt(tgt);
3976                         } else if (prli_rsp[index].retry)
3977                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3978                         else
3979                                 ibmvfc_del_tgt(tgt);
3980                 } else
3981                         ibmvfc_del_tgt(tgt);
3982                 break;
3983         case IBMVFC_MAD_DRIVER_FAILED:
3984                 break;
3985         case IBMVFC_MAD_CRQ_ERROR:
3986                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3987                 break;
3988         case IBMVFC_MAD_FAILED:
3989         default:
3990                 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3991                      be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3992                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3993                 else if (tgt->logo_rcvd)
3994                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3995                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3996                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3997                 else
3998                         ibmvfc_del_tgt(tgt);
3999
4000                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
4001                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4002                         be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
4003                 break;
4004         }
4005
4006         kref_put(&tgt->kref, ibmvfc_release_tgt);
4007         ibmvfc_free_event(evt);
4008         wake_up(&vhost->work_wait_q);
4009 }
4010
4011 /**
4012  * ibmvfc_tgt_send_prli - Send a process login
4013  * @tgt:        ibmvfc target struct
4014  *
4015  **/
4016 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
4017 {
4018         struct ibmvfc_process_login *prli;
4019         struct ibmvfc_host *vhost = tgt->vhost;
4020         struct ibmvfc_event *evt;
4021
4022         if (vhost->discovery_threads >= disc_threads)
4023                 return;
4024
4025         kref_get(&tgt->kref);
4026         evt = ibmvfc_get_event(&vhost->crq);
4027         vhost->discovery_threads++;
4028         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
4029         evt->tgt = tgt;
4030         prli = &evt->iu.prli;
4031         memset(prli, 0, sizeof(*prli));
4032         if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4033                 prli->common.version = cpu_to_be32(2);
4034                 prli->target_wwpn = cpu_to_be64(tgt->wwpn);
4035         } else {
4036                 prli->common.version = cpu_to_be32(1);
4037         }
4038         prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
4039         prli->common.length = cpu_to_be16(sizeof(*prli));
4040         prli->scsi_id = cpu_to_be64(tgt->scsi_id);
4041
4042         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
4043         prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
4044         prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
4045         prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
4046
4047         if (cls3_error)
4048                 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
4049
4050         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4051         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4052                 vhost->discovery_threads--;
4053                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4054                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4055         } else
4056                 tgt_dbg(tgt, "Sent process login\n");
4057 }
4058
4059 /**
4060  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
4061  * @evt:        ibmvfc event struct
4062  *
4063  **/
4064 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
4065 {
4066         struct ibmvfc_target *tgt = evt->tgt;
4067         struct ibmvfc_host *vhost = evt->vhost;
4068         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
4069         u32 status = be16_to_cpu(rsp->common.status);
4070         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4071
4072         vhost->discovery_threads--;
4073         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4074         switch (status) {
4075         case IBMVFC_MAD_SUCCESS:
4076                 tgt_dbg(tgt, "Port Login succeeded\n");
4077                 if (tgt->ids.port_name &&
4078                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
4079                         vhost->reinit = 1;
4080                         tgt_dbg(tgt, "Port re-init required\n");
4081                         break;
4082                 }
4083                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4084                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4085                 tgt->ids.port_id = tgt->scsi_id;
4086                 memcpy(&tgt->service_parms, &rsp->service_parms,
4087                        sizeof(tgt->service_parms));
4088                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4089                        sizeof(tgt->service_parms_change));
4090                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4091                 break;
4092         case IBMVFC_MAD_DRIVER_FAILED:
4093                 break;
4094         case IBMVFC_MAD_CRQ_ERROR:
4095                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4096                 break;
4097         case IBMVFC_MAD_FAILED:
4098         default:
4099                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4100                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4101                 else
4102                         ibmvfc_del_tgt(tgt);
4103
4104                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4105                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4106                                              be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4107                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4108                         ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
4109                 break;
4110         }
4111
4112         kref_put(&tgt->kref, ibmvfc_release_tgt);
4113         ibmvfc_free_event(evt);
4114         wake_up(&vhost->work_wait_q);
4115 }
4116
4117 /**
4118  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
4119  * @tgt:        ibmvfc target struct
4120  *
4121  **/
4122 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
4123 {
4124         struct ibmvfc_port_login *plogi;
4125         struct ibmvfc_host *vhost = tgt->vhost;
4126         struct ibmvfc_event *evt;
4127
4128         if (vhost->discovery_threads >= disc_threads)
4129                 return;
4130
4131         kref_get(&tgt->kref);
4132         tgt->logo_rcvd = 0;
4133         evt = ibmvfc_get_event(&vhost->crq);
4134         vhost->discovery_threads++;
4135         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4136         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
4137         evt->tgt = tgt;
4138         plogi = &evt->iu.plogi;
4139         memset(plogi, 0, sizeof(*plogi));
4140         if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4141                 plogi->common.version = cpu_to_be32(2);
4142                 plogi->target_wwpn = cpu_to_be64(tgt->wwpn);
4143         } else {
4144                 plogi->common.version = cpu_to_be32(1);
4145         }
4146         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
4147         plogi->common.length = cpu_to_be16(sizeof(*plogi));
4148         plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
4149
4150         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4151                 vhost->discovery_threads--;
4152                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4153                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4154         } else
4155                 tgt_dbg(tgt, "Sent port login\n");
4156 }
4157
4158 /**
4159  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
4160  * @evt:        ibmvfc event struct
4161  *
4162  **/
4163 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
4164 {
4165         struct ibmvfc_target *tgt = evt->tgt;
4166         struct ibmvfc_host *vhost = evt->vhost;
4167         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
4168         u32 status = be16_to_cpu(rsp->common.status);
4169
4170         vhost->discovery_threads--;
4171         ibmvfc_free_event(evt);
4172         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4173
4174         switch (status) {
4175         case IBMVFC_MAD_SUCCESS:
4176                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
4177                 break;
4178         case IBMVFC_MAD_DRIVER_FAILED:
4179                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4180                 wake_up(&vhost->work_wait_q);
4181                 return;
4182         case IBMVFC_MAD_FAILED:
4183         default:
4184                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
4185                 break;
4186         }
4187
4188         ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
4189         kref_put(&tgt->kref, ibmvfc_release_tgt);
4190         wake_up(&vhost->work_wait_q);
4191 }
4192
4193 /**
4194  * __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout
4195  * @tgt:                ibmvfc target struct
4196  * @done:               Routine to call when the event is responded to
4197  *
4198  * Returns:
4199  *      Allocated and initialized ibmvfc_event struct
4200  **/
4201 static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt,
4202                                                                  void (*done) (struct ibmvfc_event *))
4203 {
4204         struct ibmvfc_implicit_logout *mad;
4205         struct ibmvfc_host *vhost = tgt->vhost;
4206         struct ibmvfc_event *evt;
4207
4208         kref_get(&tgt->kref);
4209         evt = ibmvfc_get_event(&vhost->crq);
4210         ibmvfc_init_event(evt, done, IBMVFC_MAD_FORMAT);
4211         evt->tgt = tgt;
4212         mad = &evt->iu.implicit_logout;
4213         memset(mad, 0, sizeof(*mad));
4214         mad->common.version = cpu_to_be32(1);
4215         mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
4216         mad->common.length = cpu_to_be16(sizeof(*mad));
4217         mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4218         return evt;
4219 }
4220
4221 /**
4222  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
4223  * @tgt:                ibmvfc target struct
4224  *
4225  **/
4226 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
4227 {
4228         struct ibmvfc_host *vhost = tgt->vhost;
4229         struct ibmvfc_event *evt;
4230
4231         if (vhost->discovery_threads >= disc_threads)
4232                 return;
4233
4234         vhost->discovery_threads++;
4235         evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4236                                                    ibmvfc_tgt_implicit_logout_done);
4237
4238         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4239         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4240                 vhost->discovery_threads--;
4241                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4242                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4243         } else
4244                 tgt_dbg(tgt, "Sent Implicit Logout\n");
4245 }
4246
4247 /**
4248  * ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD
4249  * @evt:        ibmvfc event struct
4250  *
4251  **/
4252 static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt)
4253 {
4254         struct ibmvfc_target *tgt = evt->tgt;
4255         struct ibmvfc_host *vhost = evt->vhost;
4256         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4257         u32 status = be16_to_cpu(mad->common.status);
4258
4259         vhost->discovery_threads--;
4260         ibmvfc_free_event(evt);
4261
4262         /*
4263          * If our state is IBMVFC_HOST_OFFLINE, we could be unloading the
4264          * driver in which case we need to free up all the targets. If we are
4265          * not unloading, we will still go through a hard reset to get out of
4266          * offline state, so there is no need to track the old targets in that
4267          * case.
4268          */
4269         if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE)
4270                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4271         else
4272                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT);
4273
4274         tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed");
4275         kref_put(&tgt->kref, ibmvfc_release_tgt);
4276         wake_up(&vhost->work_wait_q);
4277 }
4278
4279 /**
4280  * ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target
4281  * @tgt:                ibmvfc target struct
4282  *
4283  **/
4284 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt)
4285 {
4286         struct ibmvfc_host *vhost = tgt->vhost;
4287         struct ibmvfc_event *evt;
4288
4289         if (!vhost->logged_in) {
4290                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4291                 return;
4292         }
4293
4294         if (vhost->discovery_threads >= disc_threads)
4295                 return;
4296
4297         vhost->discovery_threads++;
4298         evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4299                                                    ibmvfc_tgt_implicit_logout_and_del_done);
4300
4301         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT);
4302         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4303                 vhost->discovery_threads--;
4304                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4305                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4306         } else
4307                 tgt_dbg(tgt, "Sent Implicit Logout\n");
4308 }
4309
4310 /**
4311  * ibmvfc_tgt_move_login_done - Completion handler for Move Login
4312  * @evt:        ibmvfc event struct
4313  *
4314  **/
4315 static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt)
4316 {
4317         struct ibmvfc_target *tgt = evt->tgt;
4318         struct ibmvfc_host *vhost = evt->vhost;
4319         struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login;
4320         u32 status = be16_to_cpu(rsp->common.status);
4321         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4322
4323         vhost->discovery_threads--;
4324         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4325         switch (status) {
4326         case IBMVFC_MAD_SUCCESS:
4327                 tgt_dbg(tgt, "Move Login succeeded for new scsi_id: %llX\n", tgt->new_scsi_id);
4328                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4329                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4330                 tgt->scsi_id = tgt->new_scsi_id;
4331                 tgt->ids.port_id = tgt->scsi_id;
4332                 memcpy(&tgt->service_parms, &rsp->service_parms,
4333                        sizeof(tgt->service_parms));
4334                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4335                        sizeof(tgt->service_parms_change));
4336                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4337                 break;
4338         case IBMVFC_MAD_DRIVER_FAILED:
4339                 break;
4340         case IBMVFC_MAD_CRQ_ERROR:
4341                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4342                 break;
4343         case IBMVFC_MAD_FAILED:
4344         default:
4345                 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4346
4347                 tgt_log(tgt, level,
4348                         "Move Login failed: new scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n",
4349                         tgt->new_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags),
4350                         status);
4351                 break;
4352         }
4353
4354         kref_put(&tgt->kref, ibmvfc_release_tgt);
4355         ibmvfc_free_event(evt);
4356         wake_up(&vhost->work_wait_q);
4357 }
4358
4359
4360 /**
4361  * ibmvfc_tgt_move_login - Initiate a move login for specified target
4362  * @tgt:                ibmvfc target struct
4363  *
4364  **/
4365 static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt)
4366 {
4367         struct ibmvfc_host *vhost = tgt->vhost;
4368         struct ibmvfc_move_login *move;
4369         struct ibmvfc_event *evt;
4370
4371         if (vhost->discovery_threads >= disc_threads)
4372                 return;
4373
4374         kref_get(&tgt->kref);
4375         evt = ibmvfc_get_event(&vhost->crq);
4376         vhost->discovery_threads++;
4377         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4378         ibmvfc_init_event(evt, ibmvfc_tgt_move_login_done, IBMVFC_MAD_FORMAT);
4379         evt->tgt = tgt;
4380         move = &evt->iu.move_login;
4381         memset(move, 0, sizeof(*move));
4382         move->common.version = cpu_to_be32(1);
4383         move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN);
4384         move->common.length = cpu_to_be16(sizeof(*move));
4385
4386         move->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4387         move->new_scsi_id = cpu_to_be64(tgt->new_scsi_id);
4388         move->wwpn = cpu_to_be64(tgt->wwpn);
4389         move->node_name = cpu_to_be64(tgt->ids.node_name);
4390
4391         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4392                 vhost->discovery_threads--;
4393                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4394                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4395         } else
4396                 tgt_dbg(tgt, "Sent Move Login for new scsi_id: %llX\n", tgt->new_scsi_id);
4397 }
4398
4399 /**
4400  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
4401  * @mad:        ibmvfc passthru mad struct
4402  * @tgt:        ibmvfc target struct
4403  *
4404  * Returns:
4405  *      1 if PLOGI needed / 0 if PLOGI not needed
4406  **/
4407 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
4408                                     struct ibmvfc_target *tgt)
4409 {
4410         if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
4411                 return 1;
4412         if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
4413                 return 1;
4414         if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
4415                 return 1;
4416         return 0;
4417 }
4418
4419 /**
4420  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
4421  * @evt:        ibmvfc event struct
4422  *
4423  **/
4424 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
4425 {
4426         struct ibmvfc_target *tgt = evt->tgt;
4427         struct ibmvfc_host *vhost = evt->vhost;
4428         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4429         u32 status = be16_to_cpu(mad->common.status);
4430         u8 fc_reason, fc_explain;
4431
4432         vhost->discovery_threads--;
4433         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4434         del_timer(&tgt->timer);
4435
4436         switch (status) {
4437         case IBMVFC_MAD_SUCCESS:
4438                 tgt_dbg(tgt, "ADISC succeeded\n");
4439                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
4440                         ibmvfc_del_tgt(tgt);
4441                 break;
4442         case IBMVFC_MAD_DRIVER_FAILED:
4443                 break;
4444         case IBMVFC_MAD_FAILED:
4445         default:
4446                 ibmvfc_del_tgt(tgt);
4447                 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
4448                 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
4449                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4450                          ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
4451                          be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error),
4452                          ibmvfc_get_fc_type(fc_reason), fc_reason,
4453                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
4454                 break;
4455         }
4456
4457         kref_put(&tgt->kref, ibmvfc_release_tgt);
4458         ibmvfc_free_event(evt);
4459         wake_up(&vhost->work_wait_q);
4460 }
4461
4462 /**
4463  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
4464  * @evt:                ibmvfc event struct
4465  *
4466  **/
4467 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
4468 {
4469         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
4470
4471         memset(mad, 0, sizeof(*mad));
4472         mad->common.version = cpu_to_be32(1);
4473         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
4474         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
4475         mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4476                 offsetof(struct ibmvfc_passthru_mad, iu));
4477         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
4478         mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4479         mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
4480         mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4481                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4482                 offsetof(struct ibmvfc_passthru_fc_iu, payload));
4483         mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4484         mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4485                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4486                 offsetof(struct ibmvfc_passthru_fc_iu, response));
4487         mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
4488 }
4489
4490 /**
4491  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
4492  * @evt:                ibmvfc event struct
4493  *
4494  * Just cleanup this event struct. Everything else is handled by
4495  * the ADISC completion handler. If the ADISC never actually comes
4496  * back, we still have the timer running on the ADISC event struct
4497  * which will fire and cause the CRQ to get reset.
4498  *
4499  **/
4500 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
4501 {
4502         struct ibmvfc_host *vhost = evt->vhost;
4503         struct ibmvfc_target *tgt = evt->tgt;
4504
4505         tgt_dbg(tgt, "ADISC cancel complete\n");
4506         vhost->abort_threads--;
4507         ibmvfc_free_event(evt);
4508         kref_put(&tgt->kref, ibmvfc_release_tgt);
4509         wake_up(&vhost->work_wait_q);
4510 }
4511
4512 /**
4513  * ibmvfc_adisc_timeout - Handle an ADISC timeout
4514  * @t:          ibmvfc target struct
4515  *
4516  * If an ADISC times out, send a cancel. If the cancel times
4517  * out, reset the CRQ. When the ADISC comes back as cancelled,
4518  * log back into the target.
4519  **/
4520 static void ibmvfc_adisc_timeout(struct timer_list *t)
4521 {
4522         struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
4523         struct ibmvfc_host *vhost = tgt->vhost;
4524         struct ibmvfc_event *evt;
4525         struct ibmvfc_tmf *tmf;
4526         unsigned long flags;
4527         int rc;
4528
4529         tgt_dbg(tgt, "ADISC timeout\n");
4530         spin_lock_irqsave(vhost->host->host_lock, flags);
4531         if (vhost->abort_threads >= disc_threads ||
4532             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
4533             vhost->state != IBMVFC_INITIALIZING ||
4534             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
4535                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4536                 return;
4537         }
4538
4539         vhost->abort_threads++;
4540         kref_get(&tgt->kref);
4541         evt = ibmvfc_get_event(&vhost->crq);
4542         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
4543
4544         evt->tgt = tgt;
4545         tmf = &evt->iu.tmf;
4546         memset(tmf, 0, sizeof(*tmf));
4547         if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4548                 tmf->common.version = cpu_to_be32(2);
4549                 tmf->target_wwpn = cpu_to_be64(tgt->wwpn);
4550         } else {
4551                 tmf->common.version = cpu_to_be32(1);
4552         }
4553         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
4554         tmf->common.length = cpu_to_be16(sizeof(*tmf));
4555         tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
4556         tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
4557
4558         rc = ibmvfc_send_event(evt, vhost, default_timeout);
4559
4560         if (rc) {
4561                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
4562                 vhost->abort_threads--;
4563                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4564                 __ibmvfc_reset_host(vhost);
4565         } else
4566                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
4567         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4568 }
4569
4570 /**
4571  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
4572  * @tgt:                ibmvfc target struct
4573  *
4574  * When sending an ADISC we end up with two timers running. The
4575  * first timer is the timer in the ibmvfc target struct. If this
4576  * fires, we send a cancel to the target. The second timer is the
4577  * timer on the ibmvfc event for the ADISC, which is longer. If that
4578  * fires, it means the ADISC timed out and our attempt to cancel it
4579  * also failed, so we need to reset the CRQ.
4580  **/
4581 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
4582 {
4583         struct ibmvfc_passthru_mad *mad;
4584         struct ibmvfc_host *vhost = tgt->vhost;
4585         struct ibmvfc_event *evt;
4586
4587         if (vhost->discovery_threads >= disc_threads)
4588                 return;
4589
4590         kref_get(&tgt->kref);
4591         evt = ibmvfc_get_event(&vhost->crq);
4592         vhost->discovery_threads++;
4593         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
4594         evt->tgt = tgt;
4595
4596         ibmvfc_init_passthru(evt);
4597         mad = &evt->iu.passthru;
4598         mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
4599         mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
4600         mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
4601
4602         mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
4603         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
4604                sizeof(vhost->login_buf->resp.port_name));
4605         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
4606                sizeof(vhost->login_buf->resp.node_name));
4607         mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
4608
4609         if (timer_pending(&tgt->timer))
4610                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
4611         else {
4612                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
4613                 add_timer(&tgt->timer);
4614         }
4615
4616         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4617         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
4618                 vhost->discovery_threads--;
4619                 del_timer(&tgt->timer);
4620                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4621                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4622         } else
4623                 tgt_dbg(tgt, "Sent ADISC\n");
4624 }
4625
4626 /**
4627  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
4628  * @evt:        ibmvfc event struct
4629  *
4630  **/
4631 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
4632 {
4633         struct ibmvfc_target *tgt = evt->tgt;
4634         struct ibmvfc_host *vhost = evt->vhost;
4635         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
4636         u32 status = be16_to_cpu(rsp->common.status);
4637         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4638
4639         vhost->discovery_threads--;
4640         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4641         switch (status) {
4642         case IBMVFC_MAD_SUCCESS:
4643                 tgt_dbg(tgt, "Query Target succeeded\n");
4644                 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
4645                         ibmvfc_del_tgt(tgt);
4646                 else
4647                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
4648                 break;
4649         case IBMVFC_MAD_DRIVER_FAILED:
4650                 break;
4651         case IBMVFC_MAD_CRQ_ERROR:
4652                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4653                 break;
4654         case IBMVFC_MAD_FAILED:
4655         default:
4656                 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
4657                     be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
4658                     be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
4659                         ibmvfc_del_tgt(tgt);
4660                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4661                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4662                 else
4663                         ibmvfc_del_tgt(tgt);
4664
4665                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4666                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4667                         be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4668                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4669                         ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain),
4670                         status);
4671                 break;
4672         }
4673
4674         kref_put(&tgt->kref, ibmvfc_release_tgt);
4675         ibmvfc_free_event(evt);
4676         wake_up(&vhost->work_wait_q);
4677 }
4678
4679 /**
4680  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
4681  * @tgt:        ibmvfc target struct
4682  *
4683  **/
4684 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
4685 {
4686         struct ibmvfc_query_tgt *query_tgt;
4687         struct ibmvfc_host *vhost = tgt->vhost;
4688         struct ibmvfc_event *evt;
4689
4690         if (vhost->discovery_threads >= disc_threads)
4691                 return;
4692
4693         kref_get(&tgt->kref);
4694         evt = ibmvfc_get_event(&vhost->crq);
4695         vhost->discovery_threads++;
4696         evt->tgt = tgt;
4697         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
4698         query_tgt = &evt->iu.query_tgt;
4699         memset(query_tgt, 0, sizeof(*query_tgt));
4700         query_tgt->common.version = cpu_to_be32(1);
4701         query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
4702         query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
4703         query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
4704
4705         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4706         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4707                 vhost->discovery_threads--;
4708                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4709                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4710         } else
4711                 tgt_dbg(tgt, "Sent Query Target\n");
4712 }
4713
4714 /**
4715  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
4716  * @vhost:              ibmvfc host struct
4717  * @target:             Holds SCSI ID to allocate target forand the WWPN
4718  *
4719  * Returns:
4720  *      0 on success / other on failure
4721  **/
4722 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost,
4723                                struct ibmvfc_discover_targets_entry *target)
4724 {
4725         struct ibmvfc_target *stgt = NULL;
4726         struct ibmvfc_target *wtgt = NULL;
4727         struct ibmvfc_target *tgt;
4728         unsigned long flags;
4729         u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK;
4730         u64 wwpn = be64_to_cpu(target->wwpn);
4731
4732         /* Look to see if we already have a target allocated for this SCSI ID or WWPN */
4733         spin_lock_irqsave(vhost->host->host_lock, flags);
4734         list_for_each_entry(tgt, &vhost->targets, queue) {
4735                 if (tgt->wwpn == wwpn) {
4736                         wtgt = tgt;
4737                         break;
4738                 }
4739         }
4740
4741         list_for_each_entry(tgt, &vhost->targets, queue) {
4742                 if (tgt->scsi_id == scsi_id) {
4743                         stgt = tgt;
4744                         break;
4745                 }
4746         }
4747
4748         if (wtgt && !stgt) {
4749                 /*
4750                  * A WWPN target has moved and we still are tracking the old
4751                  * SCSI ID.  The only way we should be able to get here is if
4752                  * we attempted to send an implicit logout for the old SCSI ID
4753                  * and it failed for some reason, such as there being I/O
4754                  * pending to the target. In this case, we will have already
4755                  * deleted the rport from the FC transport so we do a move
4756                  * login, which works even with I/O pending, however, if
4757                  * there is still I/O pending, it will stay outstanding, so
4758                  * we only do this if fast fail is disabled for the rport,
4759                  * otherwise we let terminate_rport_io clean up the port
4760                  * before we login at the new location.
4761                  */
4762                 if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
4763                         if (wtgt->move_login) {
4764                                 /*
4765                                  * Do a move login here. The old target is no longer
4766                                  * known to the transport layer We don't use the
4767                                  * normal ibmvfc_set_tgt_action to set this, as we
4768                                  * don't normally want to allow this state change.
4769                                  */
4770                                 wtgt->new_scsi_id = scsi_id;
4771                                 wtgt->action = IBMVFC_TGT_ACTION_INIT;
4772                                 wtgt->init_retries = 0;
4773                                 ibmvfc_init_tgt(wtgt, ibmvfc_tgt_move_login);
4774                         }
4775                         goto unlock_out;
4776                 } else {
4777                         tgt_err(wtgt, "Unexpected target state: %d, %p\n",
4778                                 wtgt->action, wtgt->rport);
4779                 }
4780         } else if (stgt) {
4781                 if (tgt->need_login)
4782                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4783                 goto unlock_out;
4784         }
4785         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4786
4787         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
4788         memset(tgt, 0, sizeof(*tgt));
4789         tgt->scsi_id = scsi_id;
4790         tgt->wwpn = wwpn;
4791         tgt->vhost = vhost;
4792         tgt->need_login = 1;
4793         timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
4794         kref_init(&tgt->kref);
4795         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4796         spin_lock_irqsave(vhost->host->host_lock, flags);
4797         tgt->cancel_key = vhost->task_set++;
4798         list_add_tail(&tgt->queue, &vhost->targets);
4799
4800 unlock_out:
4801         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4802         return 0;
4803 }
4804
4805 /**
4806  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
4807  * @vhost:              ibmvfc host struct
4808  *
4809  * Returns:
4810  *      0 on success / other on failure
4811  **/
4812 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
4813 {
4814         int i, rc;
4815
4816         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
4817                 rc = ibmvfc_alloc_target(vhost, &vhost->disc_buf[i]);
4818
4819         return rc;
4820 }
4821
4822 /**
4823  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
4824  * @evt:        ibmvfc event struct
4825  *
4826  **/
4827 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
4828 {
4829         struct ibmvfc_host *vhost = evt->vhost;
4830         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
4831         u32 mad_status = be16_to_cpu(rsp->common.status);
4832         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4833
4834         switch (mad_status) {
4835         case IBMVFC_MAD_SUCCESS:
4836                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
4837                 vhost->num_targets = be32_to_cpu(rsp->num_written);
4838                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
4839                 break;
4840         case IBMVFC_MAD_FAILED:
4841                 level += ibmvfc_retry_host_init(vhost);
4842                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
4843                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4844                            be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
4845                 break;
4846         case IBMVFC_MAD_DRIVER_FAILED:
4847                 break;
4848         default:
4849                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
4850                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4851                 break;
4852         }
4853
4854         ibmvfc_free_event(evt);
4855         wake_up(&vhost->work_wait_q);
4856 }
4857
4858 /**
4859  * ibmvfc_discover_targets - Send Discover Targets MAD
4860  * @vhost:      ibmvfc host struct
4861  *
4862  **/
4863 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
4864 {
4865         struct ibmvfc_discover_targets *mad;
4866         struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq);
4867
4868         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
4869         mad = &evt->iu.discover_targets;
4870         memset(mad, 0, sizeof(*mad));
4871         mad->common.version = cpu_to_be32(1);
4872         mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
4873         mad->common.length = cpu_to_be16(sizeof(*mad));
4874         mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
4875         mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
4876         mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
4877         mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST);
4878         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4879
4880         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4881                 ibmvfc_dbg(vhost, "Sent discover targets\n");
4882         else
4883                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4884 }
4885
4886 static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt)
4887 {
4888         struct ibmvfc_host *vhost = evt->vhost;
4889         struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf;
4890         struct ibmvfc_scsi_channels *scrqs = &vhost->scsi_scrqs;
4891         u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status);
4892         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4893         int flags, active_queues, i;
4894
4895         ibmvfc_free_event(evt);
4896
4897         switch (mad_status) {
4898         case IBMVFC_MAD_SUCCESS:
4899                 ibmvfc_dbg(vhost, "Channel Setup succeeded\n");
4900                 flags = be32_to_cpu(setup->flags);
4901                 vhost->do_enquiry = 0;
4902                 active_queues = be32_to_cpu(setup->num_scsi_subq_channels);
4903                 scrqs->active_queues = active_queues;
4904
4905                 if (flags & IBMVFC_CHANNELS_CANCELED) {
4906                         ibmvfc_dbg(vhost, "Channels Canceled\n");
4907                         vhost->using_channels = 0;
4908                 } else {
4909                         if (active_queues)
4910                                 vhost->using_channels = 1;
4911                         for (i = 0; i < active_queues; i++)
4912                                 scrqs->scrqs[i].vios_cookie =
4913                                         be64_to_cpu(setup->channel_handles[i]);
4914
4915                         ibmvfc_dbg(vhost, "Using %u channels\n",
4916                                    vhost->scsi_scrqs.active_queues);
4917                 }
4918                 break;
4919         case IBMVFC_MAD_FAILED:
4920                 level += ibmvfc_retry_host_init(vhost);
4921                 ibmvfc_log(vhost, level, "Channel Setup failed\n");
4922                 fallthrough;
4923         case IBMVFC_MAD_DRIVER_FAILED:
4924                 return;
4925         default:
4926                 dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n",
4927                         mad_status);
4928                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4929                 return;
4930         }
4931
4932         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4933         wake_up(&vhost->work_wait_q);
4934 }
4935
4936 static void ibmvfc_channel_setup(struct ibmvfc_host *vhost)
4937 {
4938         struct ibmvfc_channel_setup_mad *mad;
4939         struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf;
4940         struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq);
4941         struct ibmvfc_scsi_channels *scrqs = &vhost->scsi_scrqs;
4942         unsigned int num_channels =
4943                 min(vhost->client_scsi_channels, vhost->max_vios_scsi_channels);
4944         int i;
4945
4946         memset(setup_buf, 0, sizeof(*setup_buf));
4947         if (num_channels == 0)
4948                 setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
4949         else {
4950                 setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels);
4951                 for (i = 0; i < num_channels; i++)
4952                         setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie);
4953         }
4954
4955         ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT);
4956         mad = &evt->iu.channel_setup;
4957         memset(mad, 0, sizeof(*mad));
4958         mad->common.version = cpu_to_be32(1);
4959         mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP);
4960         mad->common.length = cpu_to_be16(sizeof(*mad));
4961         mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma);
4962         mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf));
4963
4964         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4965
4966         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4967                 ibmvfc_dbg(vhost, "Sent channel setup\n");
4968         else
4969                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
4970 }
4971
4972 static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt)
4973 {
4974         struct ibmvfc_host *vhost = evt->vhost;
4975         struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry;
4976         u32 mad_status = be16_to_cpu(rsp->common.status);
4977         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4978
4979         switch (mad_status) {
4980         case IBMVFC_MAD_SUCCESS:
4981                 ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n");
4982                 vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels);
4983                 ibmvfc_free_event(evt);
4984                 break;
4985         case IBMVFC_MAD_FAILED:
4986                 level += ibmvfc_retry_host_init(vhost);
4987                 ibmvfc_log(vhost, level, "Channel Enquiry failed\n");
4988                 fallthrough;
4989         case IBMVFC_MAD_DRIVER_FAILED:
4990                 ibmvfc_free_event(evt);
4991                 return;
4992         default:
4993                 dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n",
4994                         mad_status);
4995                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4996                 ibmvfc_free_event(evt);
4997                 return;
4998         }
4999
5000         ibmvfc_channel_setup(vhost);
5001 }
5002
5003 static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost)
5004 {
5005         struct ibmvfc_channel_enquiry *mad;
5006         struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq);
5007
5008         ibmvfc_init_event(evt, ibmvfc_channel_enquiry_done, IBMVFC_MAD_FORMAT);
5009         mad = &evt->iu.channel_enquiry;
5010         memset(mad, 0, sizeof(*mad));
5011         mad->common.version = cpu_to_be32(1);
5012         mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY);
5013         mad->common.length = cpu_to_be16(sizeof(*mad));
5014
5015         if (mig_channels_only)
5016                 mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT);
5017         if (mig_no_less_channels)
5018                 mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT);
5019
5020         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5021
5022         if (!ibmvfc_send_event(evt, vhost, default_timeout))
5023                 ibmvfc_dbg(vhost, "Send channel enquiry\n");
5024         else
5025                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5026 }
5027
5028 /**
5029  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
5030  * @evt:        ibmvfc event struct
5031  *
5032  **/
5033 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
5034 {
5035         struct ibmvfc_host *vhost = evt->vhost;
5036         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
5037         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
5038         unsigned int npiv_max_sectors;
5039         int level = IBMVFC_DEFAULT_LOG_LEVEL;
5040
5041         switch (mad_status) {
5042         case IBMVFC_MAD_SUCCESS:
5043                 ibmvfc_free_event(evt);
5044                 break;
5045         case IBMVFC_MAD_FAILED:
5046                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
5047                         level += ibmvfc_retry_host_init(vhost);
5048                 else
5049                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5050                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
5051                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
5052                                                 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
5053                 ibmvfc_free_event(evt);
5054                 return;
5055         case IBMVFC_MAD_CRQ_ERROR:
5056                 ibmvfc_retry_host_init(vhost);
5057                 fallthrough;
5058         case IBMVFC_MAD_DRIVER_FAILED:
5059                 ibmvfc_free_event(evt);
5060                 return;
5061         default:
5062                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
5063                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5064                 ibmvfc_free_event(evt);
5065                 return;
5066         }
5067
5068         vhost->client_migrated = 0;
5069
5070         if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
5071                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
5072                         rsp->flags);
5073                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5074                 wake_up(&vhost->work_wait_q);
5075                 return;
5076         }
5077
5078         if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
5079                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
5080                         rsp->max_cmds);
5081                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5082                 wake_up(&vhost->work_wait_q);
5083                 return;
5084         }
5085
5086         vhost->logged_in = 1;
5087         npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
5088         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
5089                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
5090                  rsp->drc_name, npiv_max_sectors);
5091
5092         fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
5093         fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
5094         fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
5095         fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
5096         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
5097         fc_host_supported_classes(vhost->host) = 0;
5098         if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
5099                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
5100         if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
5101                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
5102         if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
5103                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
5104         fc_host_maxframe_size(vhost->host) =
5105                 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
5106
5107         vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
5108         vhost->host->max_sectors = npiv_max_sectors;
5109
5110         if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) {
5111                 ibmvfc_channel_enquiry(vhost);
5112         } else {
5113                 vhost->do_enquiry = 0;
5114                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5115                 wake_up(&vhost->work_wait_q);
5116         }
5117 }
5118
5119 /**
5120  * ibmvfc_npiv_login - Sends NPIV login
5121  * @vhost:      ibmvfc host struct
5122  *
5123  **/
5124 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
5125 {
5126         struct ibmvfc_npiv_login_mad *mad;
5127         struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq);
5128
5129         ibmvfc_gather_partition_info(vhost);
5130         ibmvfc_set_login_info(vhost);
5131         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
5132
5133         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
5134         mad = &evt->iu.npiv_login;
5135         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
5136         mad->common.version = cpu_to_be32(1);
5137         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
5138         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
5139         mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
5140         mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
5141
5142         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5143
5144         if (!ibmvfc_send_event(evt, vhost, default_timeout))
5145                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
5146         else
5147                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5148 }
5149
5150 /**
5151  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
5152  * @evt:                ibmvfc event struct
5153  *
5154  **/
5155 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
5156 {
5157         struct ibmvfc_host *vhost = evt->vhost;
5158         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
5159
5160         ibmvfc_free_event(evt);
5161
5162         switch (mad_status) {
5163         case IBMVFC_MAD_SUCCESS:
5164                 if (list_empty(&vhost->crq.sent) &&
5165                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
5166                         ibmvfc_init_host(vhost);
5167                         return;
5168                 }
5169                 break;
5170         case IBMVFC_MAD_FAILED:
5171         case IBMVFC_MAD_NOT_SUPPORTED:
5172         case IBMVFC_MAD_CRQ_ERROR:
5173         case IBMVFC_MAD_DRIVER_FAILED:
5174         default:
5175                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
5176                 break;
5177         }
5178
5179         ibmvfc_hard_reset_host(vhost);
5180 }
5181
5182 /**
5183  * ibmvfc_npiv_logout - Issue an NPIV Logout
5184  * @vhost:              ibmvfc host struct
5185  *
5186  **/
5187 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
5188 {
5189         struct ibmvfc_npiv_logout_mad *mad;
5190         struct ibmvfc_event *evt;
5191
5192         evt = ibmvfc_get_event(&vhost->crq);
5193         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
5194
5195         mad = &evt->iu.npiv_logout;
5196         memset(mad, 0, sizeof(*mad));
5197         mad->common.version = cpu_to_be32(1);
5198         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
5199         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
5200
5201         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
5202
5203         if (!ibmvfc_send_event(evt, vhost, default_timeout))
5204                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
5205         else
5206                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5207 }
5208
5209 /**
5210  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
5211  * @vhost:              ibmvfc host struct
5212  *
5213  * Returns:
5214  *      1 if work to do / 0 if not
5215  **/
5216 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
5217 {
5218         struct ibmvfc_target *tgt;
5219
5220         list_for_each_entry(tgt, &vhost->targets, queue) {
5221                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
5222                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5223                         return 1;
5224         }
5225
5226         return 0;
5227 }
5228
5229 /**
5230  * ibmvfc_dev_logo_to_do - Is there target logout work to do?
5231  * @vhost:              ibmvfc host struct
5232  *
5233  * Returns:
5234  *      1 if work to do / 0 if not
5235  **/
5236 static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost)
5237 {
5238         struct ibmvfc_target *tgt;
5239
5240         list_for_each_entry(tgt, &vhost->targets, queue) {
5241                 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT ||
5242                     tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5243                         return 1;
5244         }
5245         return 0;
5246 }
5247
5248 /**
5249  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
5250  * @vhost:              ibmvfc host struct
5251  *
5252  * Returns:
5253  *      1 if work to do / 0 if not
5254  **/
5255 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5256 {
5257         struct ibmvfc_target *tgt;
5258
5259         if (kthread_should_stop())
5260                 return 1;
5261         switch (vhost->action) {
5262         case IBMVFC_HOST_ACTION_NONE:
5263         case IBMVFC_HOST_ACTION_INIT_WAIT:
5264         case IBMVFC_HOST_ACTION_LOGO_WAIT:
5265                 return 0;
5266         case IBMVFC_HOST_ACTION_TGT_INIT:
5267         case IBMVFC_HOST_ACTION_QUERY_TGTS:
5268                 if (vhost->discovery_threads == disc_threads)
5269                         return 0;
5270                 list_for_each_entry(tgt, &vhost->targets, queue)
5271                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
5272                                 return 1;
5273                 list_for_each_entry(tgt, &vhost->targets, queue)
5274                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5275                                 return 0;
5276                 return 1;
5277         case IBMVFC_HOST_ACTION_TGT_DEL:
5278         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5279                 if (vhost->discovery_threads == disc_threads)
5280                         return 0;
5281                 list_for_each_entry(tgt, &vhost->targets, queue)
5282                         if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT)
5283                                 return 1;
5284                 list_for_each_entry(tgt, &vhost->targets, queue)
5285                         if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5286                                 return 0;
5287                 return 1;
5288         case IBMVFC_HOST_ACTION_LOGO:
5289         case IBMVFC_HOST_ACTION_INIT:
5290         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5291         case IBMVFC_HOST_ACTION_QUERY:
5292         case IBMVFC_HOST_ACTION_RESET:
5293         case IBMVFC_HOST_ACTION_REENABLE:
5294         default:
5295                 break;
5296         }
5297
5298         return 1;
5299 }
5300
5301 /**
5302  * ibmvfc_work_to_do - Is there task level work to do?
5303  * @vhost:              ibmvfc host struct
5304  *
5305  * Returns:
5306  *      1 if work to do / 0 if not
5307  **/
5308 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5309 {
5310         unsigned long flags;
5311         int rc;
5312
5313         spin_lock_irqsave(vhost->host->host_lock, flags);
5314         rc = __ibmvfc_work_to_do(vhost);
5315         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5316         return rc;
5317 }
5318
5319 /**
5320  * ibmvfc_log_ae - Log async events if necessary
5321  * @vhost:              ibmvfc host struct
5322  * @events:             events to log
5323  *
5324  **/
5325 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
5326 {
5327         if (events & IBMVFC_AE_RSCN)
5328                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
5329         if ((events & IBMVFC_AE_LINKDOWN) &&
5330             vhost->state >= IBMVFC_HALTED)
5331                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
5332         if ((events & IBMVFC_AE_LINKUP) &&
5333             vhost->state == IBMVFC_INITIALIZING)
5334                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
5335 }
5336
5337 /**
5338  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
5339  * @tgt:                ibmvfc target struct
5340  *
5341  **/
5342 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
5343 {
5344         struct ibmvfc_host *vhost = tgt->vhost;
5345         struct fc_rport *rport;
5346         unsigned long flags;
5347
5348         tgt_dbg(tgt, "Adding rport\n");
5349         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
5350         spin_lock_irqsave(vhost->host->host_lock, flags);
5351
5352         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5353                 tgt_dbg(tgt, "Deleting rport\n");
5354                 list_del(&tgt->queue);
5355                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5356                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5357                 fc_remote_port_delete(rport);
5358                 del_timer_sync(&tgt->timer);
5359                 kref_put(&tgt->kref, ibmvfc_release_tgt);
5360                 return;
5361         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5362                 tgt_dbg(tgt, "Deleting rport with outstanding I/O\n");
5363                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5364                 tgt->rport = NULL;
5365                 tgt->init_retries = 0;
5366                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5367                 fc_remote_port_delete(rport);
5368                 return;
5369         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
5370                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5371                 return;
5372         }
5373
5374         if (rport) {
5375                 tgt_dbg(tgt, "rport add succeeded\n");
5376                 tgt->rport = rport;
5377                 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
5378                 rport->supported_classes = 0;
5379                 tgt->target_id = rport->scsi_target_id;
5380                 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
5381                         rport->supported_classes |= FC_COS_CLASS1;
5382                 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
5383                         rport->supported_classes |= FC_COS_CLASS2;
5384                 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
5385                         rport->supported_classes |= FC_COS_CLASS3;
5386                 if (rport->rqst_q)
5387                         blk_queue_max_segments(rport->rqst_q, 1);
5388         } else
5389                 tgt_dbg(tgt, "rport add failed\n");
5390         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5391 }
5392
5393 /**
5394  * ibmvfc_do_work - Do task level work
5395  * @vhost:              ibmvfc host struct
5396  *
5397  **/
5398 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
5399 {
5400         struct ibmvfc_target *tgt;
5401         unsigned long flags;
5402         struct fc_rport *rport;
5403         LIST_HEAD(purge);
5404         int rc;
5405
5406         ibmvfc_log_ae(vhost, vhost->events_to_log);
5407         spin_lock_irqsave(vhost->host->host_lock, flags);
5408         vhost->events_to_log = 0;
5409         switch (vhost->action) {
5410         case IBMVFC_HOST_ACTION_NONE:
5411         case IBMVFC_HOST_ACTION_LOGO_WAIT:
5412         case IBMVFC_HOST_ACTION_INIT_WAIT:
5413                 break;
5414         case IBMVFC_HOST_ACTION_RESET:
5415                 list_splice_init(&vhost->purge, &purge);
5416                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5417                 ibmvfc_complete_purge(&purge);
5418                 rc = ibmvfc_reset_crq(vhost);
5419
5420                 spin_lock_irqsave(vhost->host->host_lock, flags);
5421                 if (!rc || rc == H_CLOSED)
5422                         vio_enable_interrupts(to_vio_dev(vhost->dev));
5423                 if (vhost->action == IBMVFC_HOST_ACTION_RESET) {
5424                         /*
5425                          * The only action we could have changed to would have
5426                          * been reenable, in which case, we skip the rest of
5427                          * this path and wait until we've done the re-enable
5428                          * before sending the crq init.
5429                          */
5430                         vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5431
5432                         if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
5433                             (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
5434                                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5435                                 dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
5436                         }
5437                 }
5438                 break;
5439         case IBMVFC_HOST_ACTION_REENABLE:
5440                 list_splice_init(&vhost->purge, &purge);
5441                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5442                 ibmvfc_complete_purge(&purge);
5443                 rc = ibmvfc_reenable_crq_queue(vhost);
5444
5445                 spin_lock_irqsave(vhost->host->host_lock, flags);
5446                 if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) {
5447                         /*
5448                          * The only action we could have changed to would have
5449                          * been reset, in which case, we skip the rest of this
5450                          * path and wait until we've done the reset before
5451                          * sending the crq init.
5452                          */
5453                         vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5454                         if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
5455                                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5456                                 dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
5457                         }
5458                 }
5459                 break;
5460         case IBMVFC_HOST_ACTION_LOGO:
5461                 vhost->job_step(vhost);
5462                 break;
5463         case IBMVFC_HOST_ACTION_INIT:
5464                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
5465                 if (vhost->delay_init) {
5466                         vhost->delay_init = 0;
5467                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5468                         ssleep(15);
5469                         return;
5470                 } else
5471                         vhost->job_step(vhost);
5472                 break;
5473         case IBMVFC_HOST_ACTION_QUERY:
5474                 list_for_each_entry(tgt, &vhost->targets, queue)
5475                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
5476                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
5477                 break;
5478         case IBMVFC_HOST_ACTION_QUERY_TGTS:
5479                 list_for_each_entry(tgt, &vhost->targets, queue) {
5480                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5481                                 tgt->job_step(tgt);
5482                                 break;
5483                         }
5484                 }
5485
5486                 if (!ibmvfc_dev_init_to_do(vhost))
5487                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
5488                 break;
5489         case IBMVFC_HOST_ACTION_TGT_DEL:
5490         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5491                 list_for_each_entry(tgt, &vhost->targets, queue) {
5492                         if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
5493                                 tgt->job_step(tgt);
5494                                 break;
5495                         }
5496                 }
5497
5498                 if (ibmvfc_dev_logo_to_do(vhost)) {
5499                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5500                         return;
5501                 }
5502
5503                 list_for_each_entry(tgt, &vhost->targets, queue) {
5504                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5505                                 tgt_dbg(tgt, "Deleting rport\n");
5506                                 rport = tgt->rport;
5507                                 tgt->rport = NULL;
5508                                 list_del(&tgt->queue);
5509                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5510                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5511                                 if (rport)
5512                                         fc_remote_port_delete(rport);
5513                                 del_timer_sync(&tgt->timer);
5514                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
5515                                 return;
5516                         } else if (tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5517                                 tgt_dbg(tgt, "Deleting rport with I/O outstanding\n");
5518                                 rport = tgt->rport;
5519                                 tgt->rport = NULL;
5520                                 tgt->init_retries = 0;
5521                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5522
5523                                 /*
5524                                  * If fast fail is enabled, we wait for it to fire and then clean up
5525                                  * the old port, since we expect the fast fail timer to clean up the
5526                                  * outstanding I/O faster than waiting for normal command timeouts.
5527                                  * However, if fast fail is disabled, any I/O outstanding to the
5528                                  * rport LUNs will stay outstanding indefinitely, since the EH handlers
5529                                  * won't get invoked for I/O's timing out. If this is a NPIV failover
5530                                  * scenario, the better alternative is to use the move login.
5531                                  */
5532                                 if (rport && rport->fast_io_fail_tmo == -1)
5533                                         tgt->move_login = 1;
5534                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5535                                 if (rport)
5536                                         fc_remote_port_delete(rport);
5537                                 return;
5538                         }
5539                 }
5540
5541                 if (vhost->state == IBMVFC_INITIALIZING) {
5542                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
5543                                 if (vhost->reinit) {
5544                                         vhost->reinit = 0;
5545                                         scsi_block_requests(vhost->host);
5546                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5547                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5548                                 } else {
5549                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
5550                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5551                                         wake_up(&vhost->init_wait_q);
5552                                         schedule_work(&vhost->rport_add_work_q);
5553                                         vhost->init_retries = 0;
5554                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5555                                         scsi_unblock_requests(vhost->host);
5556                                 }
5557
5558                                 return;
5559                         } else {
5560                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
5561                                 vhost->job_step = ibmvfc_discover_targets;
5562                         }
5563                 } else {
5564                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5565                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5566                         scsi_unblock_requests(vhost->host);
5567                         wake_up(&vhost->init_wait_q);
5568                         return;
5569                 }
5570                 break;
5571         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5572                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
5573                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5574                 ibmvfc_alloc_targets(vhost);
5575                 spin_lock_irqsave(vhost->host->host_lock, flags);
5576                 break;
5577         case IBMVFC_HOST_ACTION_TGT_INIT:
5578                 list_for_each_entry(tgt, &vhost->targets, queue) {
5579                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5580                                 tgt->job_step(tgt);
5581                                 break;
5582                         }
5583                 }
5584
5585                 if (!ibmvfc_dev_init_to_do(vhost))
5586                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
5587                 break;
5588         default:
5589                 break;
5590         }
5591
5592         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5593 }
5594
5595 /**
5596  * ibmvfc_work - Do task level work
5597  * @data:               ibmvfc host struct
5598  *
5599  * Returns:
5600  *      zero
5601  **/
5602 static int ibmvfc_work(void *data)
5603 {
5604         struct ibmvfc_host *vhost = data;
5605         int rc;
5606
5607         set_user_nice(current, MIN_NICE);
5608
5609         while (1) {
5610                 rc = wait_event_interruptible(vhost->work_wait_q,
5611                                               ibmvfc_work_to_do(vhost));
5612
5613                 BUG_ON(rc);
5614
5615                 if (kthread_should_stop())
5616                         break;
5617
5618                 ibmvfc_do_work(vhost);
5619         }
5620
5621         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
5622         return 0;
5623 }
5624
5625 /**
5626  * ibmvfc_alloc_queue - Allocate queue
5627  * @vhost:      ibmvfc host struct
5628  * @queue:      ibmvfc queue to allocate
5629  * @fmt:        queue format to allocate
5630  *
5631  * Returns:
5632  *      0 on success / non-zero on failure
5633  **/
5634 static int ibmvfc_alloc_queue(struct ibmvfc_host *vhost,
5635                               struct ibmvfc_queue *queue,
5636                               enum ibmvfc_msg_fmt fmt)
5637 {
5638         struct device *dev = vhost->dev;
5639         size_t fmt_size;
5640         unsigned int pool_size = 0;
5641
5642         ENTER;
5643         spin_lock_init(&queue->_lock);
5644         queue->q_lock = &queue->_lock;
5645
5646         switch (fmt) {
5647         case IBMVFC_CRQ_FMT:
5648                 fmt_size = sizeof(*queue->msgs.crq);
5649                 pool_size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
5650                 break;
5651         case IBMVFC_ASYNC_FMT:
5652                 fmt_size = sizeof(*queue->msgs.async);
5653                 break;
5654         case IBMVFC_SUB_CRQ_FMT:
5655                 fmt_size = sizeof(*queue->msgs.scrq);
5656                 /* We need one extra event for Cancel Commands */
5657                 pool_size = max_requests + 1;
5658                 break;
5659         default:
5660                 dev_warn(dev, "Unknown command/response queue message format: %d\n", fmt);
5661                 return -EINVAL;
5662         }
5663
5664         if (ibmvfc_init_event_pool(vhost, queue, pool_size)) {
5665                 dev_err(dev, "Couldn't initialize event pool.\n");
5666                 return -ENOMEM;
5667         }
5668
5669         queue->msgs.handle = (void *)get_zeroed_page(GFP_KERNEL);
5670         if (!queue->msgs.handle)
5671                 return -ENOMEM;
5672
5673         queue->msg_token = dma_map_single(dev, queue->msgs.handle, PAGE_SIZE,
5674                                           DMA_BIDIRECTIONAL);
5675
5676         if (dma_mapping_error(dev, queue->msg_token)) {
5677                 free_page((unsigned long)queue->msgs.handle);
5678                 queue->msgs.handle = NULL;
5679                 return -ENOMEM;
5680         }
5681
5682         queue->cur = 0;
5683         queue->fmt = fmt;
5684         queue->size = PAGE_SIZE / fmt_size;
5685
5686         queue->vhost = vhost;
5687         return 0;
5688 }
5689
5690 /**
5691  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
5692  * @vhost:      ibmvfc host struct
5693  *
5694  * Allocates a page for messages, maps it for dma, and registers
5695  * the crq with the hypervisor.
5696  *
5697  * Return value:
5698  *      zero on success / other on failure
5699  **/
5700 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
5701 {
5702         int rc, retrc = -ENOMEM;
5703         struct device *dev = vhost->dev;
5704         struct vio_dev *vdev = to_vio_dev(dev);
5705         struct ibmvfc_queue *crq = &vhost->crq;
5706
5707         ENTER;
5708         if (ibmvfc_alloc_queue(vhost, crq, IBMVFC_CRQ_FMT))
5709                 return -ENOMEM;
5710
5711         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5712                                         crq->msg_token, PAGE_SIZE);
5713
5714         if (rc == H_RESOURCE)
5715                 /* maybe kexecing and resource is busy. try a reset */
5716                 retrc = rc = ibmvfc_reset_crq(vhost);
5717
5718         if (rc == H_CLOSED)
5719                 dev_warn(dev, "Partner adapter not ready\n");
5720         else if (rc) {
5721                 dev_warn(dev, "Error %d opening adapter\n", rc);
5722                 goto reg_crq_failed;
5723         }
5724
5725         retrc = 0;
5726
5727         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
5728
5729         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
5730                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
5731                 goto req_irq_failed;
5732         }
5733
5734         if ((rc = vio_enable_interrupts(vdev))) {
5735                 dev_err(dev, "Error %d enabling interrupts\n", rc);
5736                 goto req_irq_failed;
5737         }
5738
5739         LEAVE;
5740         return retrc;
5741
5742 req_irq_failed:
5743         tasklet_kill(&vhost->tasklet);
5744         do {
5745                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5746         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5747 reg_crq_failed:
5748         ibmvfc_free_queue(vhost, crq);
5749         return retrc;
5750 }
5751
5752 static int ibmvfc_register_scsi_channel(struct ibmvfc_host *vhost,
5753                                   int index)
5754 {
5755         struct device *dev = vhost->dev;
5756         struct vio_dev *vdev = to_vio_dev(dev);
5757         struct ibmvfc_queue *scrq = &vhost->scsi_scrqs.scrqs[index];
5758         int rc = -ENOMEM;
5759
5760         ENTER;
5761
5762         rc = h_reg_sub_crq(vdev->unit_address, scrq->msg_token, PAGE_SIZE,
5763                            &scrq->cookie, &scrq->hw_irq);
5764
5765         /* H_CLOSED indicates successful register, but no CRQ partner */
5766         if (rc && rc != H_CLOSED) {
5767                 dev_warn(dev, "Error registering sub-crq: %d\n", rc);
5768                 if (rc == H_PARAMETER)
5769                         dev_warn_once(dev, "Firmware may not support MQ\n");
5770                 goto reg_failed;
5771         }
5772
5773         scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
5774
5775         if (!scrq->irq) {
5776                 rc = -EINVAL;
5777                 dev_err(dev, "Error mapping sub-crq[%d] irq\n", index);
5778                 goto irq_failed;
5779         }
5780
5781         snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d",
5782                  vdev->unit_address, index);
5783         rc = request_irq(scrq->irq, ibmvfc_interrupt_scsi, 0, scrq->name, scrq);
5784
5785         if (rc) {
5786                 dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index);
5787                 irq_dispose_mapping(scrq->irq);
5788                 goto irq_failed;
5789         }
5790
5791         scrq->hwq_id = index;
5792
5793         LEAVE;
5794         return 0;
5795
5796 irq_failed:
5797         do {
5798                 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
5799         } while (rtas_busy_delay(rc));
5800 reg_failed:
5801         LEAVE;
5802         return rc;
5803 }
5804
5805 static void ibmvfc_deregister_scsi_channel(struct ibmvfc_host *vhost, int index)
5806 {
5807         struct device *dev = vhost->dev;
5808         struct vio_dev *vdev = to_vio_dev(dev);
5809         struct ibmvfc_queue *scrq = &vhost->scsi_scrqs.scrqs[index];
5810         long rc;
5811
5812         ENTER;
5813
5814         free_irq(scrq->irq, scrq);
5815         irq_dispose_mapping(scrq->irq);
5816         scrq->irq = 0;
5817
5818         do {
5819                 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address,
5820                                         scrq->cookie);
5821         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5822
5823         if (rc)
5824                 dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc);
5825
5826         /* Clean out the queue */
5827         memset(scrq->msgs.crq, 0, PAGE_SIZE);
5828         scrq->cur = 0;
5829
5830         LEAVE;
5831 }
5832
5833 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *vhost)
5834 {
5835         int i, j;
5836
5837         ENTER;
5838         if (!vhost->mq_enabled || !vhost->scsi_scrqs.scrqs)
5839                 return;
5840
5841         for (i = 0; i < nr_scsi_hw_queues; i++) {
5842                 if (ibmvfc_register_scsi_channel(vhost, i)) {
5843                         for (j = i; j > 0; j--)
5844                                 ibmvfc_deregister_scsi_channel(vhost, j - 1);
5845                         vhost->do_enquiry = 0;
5846                         return;
5847                 }
5848         }
5849
5850         LEAVE;
5851 }
5852
5853 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *vhost)
5854 {
5855         int i;
5856
5857         ENTER;
5858         if (!vhost->mq_enabled || !vhost->scsi_scrqs.scrqs)
5859                 return;
5860
5861         for (i = 0; i < nr_scsi_hw_queues; i++)
5862                 ibmvfc_deregister_scsi_channel(vhost, i);
5863
5864         LEAVE;
5865 }
5866
5867 static void ibmvfc_init_sub_crqs(struct ibmvfc_host *vhost)
5868 {
5869         struct ibmvfc_queue *scrq;
5870         int i, j;
5871
5872         ENTER;
5873         if (!vhost->mq_enabled)
5874                 return;
5875
5876         vhost->scsi_scrqs.scrqs = kcalloc(nr_scsi_hw_queues,
5877                                           sizeof(*vhost->scsi_scrqs.scrqs),
5878                                           GFP_KERNEL);
5879         if (!vhost->scsi_scrqs.scrqs) {
5880                 vhost->do_enquiry = 0;
5881                 return;
5882         }
5883
5884         for (i = 0; i < nr_scsi_hw_queues; i++) {
5885                 scrq = &vhost->scsi_scrqs.scrqs[i];
5886                 if (ibmvfc_alloc_queue(vhost, scrq, IBMVFC_SUB_CRQ_FMT)) {
5887                         for (j = i; j > 0; j--) {
5888                                 scrq = &vhost->scsi_scrqs.scrqs[j - 1];
5889                                 ibmvfc_free_queue(vhost, scrq);
5890                         }
5891                         kfree(vhost->scsi_scrqs.scrqs);
5892                         vhost->scsi_scrqs.scrqs = NULL;
5893                         vhost->scsi_scrqs.active_queues = 0;
5894                         vhost->do_enquiry = 0;
5895                         vhost->mq_enabled = 0;
5896                         return;
5897                 }
5898         }
5899
5900         ibmvfc_reg_sub_crqs(vhost);
5901
5902         LEAVE;
5903 }
5904
5905 static void ibmvfc_release_sub_crqs(struct ibmvfc_host *vhost)
5906 {
5907         struct ibmvfc_queue *scrq;
5908         int i;
5909
5910         ENTER;
5911         if (!vhost->scsi_scrqs.scrqs)
5912                 return;
5913
5914         ibmvfc_dereg_sub_crqs(vhost);
5915
5916         for (i = 0; i < nr_scsi_hw_queues; i++) {
5917                 scrq = &vhost->scsi_scrqs.scrqs[i];
5918                 ibmvfc_free_queue(vhost, scrq);
5919         }
5920
5921         kfree(vhost->scsi_scrqs.scrqs);
5922         vhost->scsi_scrqs.scrqs = NULL;
5923         vhost->scsi_scrqs.active_queues = 0;
5924         LEAVE;
5925 }
5926
5927 /**
5928  * ibmvfc_free_mem - Free memory for vhost
5929  * @vhost:      ibmvfc host struct
5930  *
5931  * Return value:
5932  *      none
5933  **/
5934 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
5935 {
5936         struct ibmvfc_queue *async_q = &vhost->async_crq;
5937
5938         ENTER;
5939         mempool_destroy(vhost->tgt_pool);
5940         kfree(vhost->trace);
5941         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
5942                           vhost->disc_buf_dma);
5943         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
5944                           vhost->login_buf, vhost->login_buf_dma);
5945         dma_free_coherent(vhost->dev, sizeof(*vhost->channel_setup_buf),
5946                           vhost->channel_setup_buf, vhost->channel_setup_dma);
5947         dma_pool_destroy(vhost->sg_pool);
5948         ibmvfc_free_queue(vhost, async_q);
5949         LEAVE;
5950 }
5951
5952 /**
5953  * ibmvfc_alloc_mem - Allocate memory for vhost
5954  * @vhost:      ibmvfc host struct
5955  *
5956  * Return value:
5957  *      0 on success / non-zero on failure
5958  **/
5959 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
5960 {
5961         struct ibmvfc_queue *async_q = &vhost->async_crq;
5962         struct device *dev = vhost->dev;
5963
5964         ENTER;
5965         if (ibmvfc_alloc_queue(vhost, async_q, IBMVFC_ASYNC_FMT)) {
5966                 dev_err(dev, "Couldn't allocate/map async queue.\n");
5967                 goto nomem;
5968         }
5969
5970         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
5971                                          SG_ALL * sizeof(struct srp_direct_buf),
5972                                          sizeof(struct srp_direct_buf), 0);
5973
5974         if (!vhost->sg_pool) {
5975                 dev_err(dev, "Failed to allocate sg pool\n");
5976                 goto unmap_async_crq;
5977         }
5978
5979         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
5980                                               &vhost->login_buf_dma, GFP_KERNEL);
5981
5982         if (!vhost->login_buf) {
5983                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
5984                 goto free_sg_pool;
5985         }
5986
5987         vhost->disc_buf_sz = sizeof(*vhost->disc_buf) * max_targets;
5988         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
5989                                              &vhost->disc_buf_dma, GFP_KERNEL);
5990
5991         if (!vhost->disc_buf) {
5992                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
5993                 goto free_login_buffer;
5994         }
5995
5996         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
5997                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
5998         atomic_set(&vhost->trace_index, -1);
5999
6000         if (!vhost->trace)
6001                 goto free_disc_buffer;
6002
6003         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
6004                                                       sizeof(struct ibmvfc_target));
6005
6006         if (!vhost->tgt_pool) {
6007                 dev_err(dev, "Couldn't allocate target memory pool\n");
6008                 goto free_trace;
6009         }
6010
6011         vhost->channel_setup_buf = dma_alloc_coherent(dev, sizeof(*vhost->channel_setup_buf),
6012                                                       &vhost->channel_setup_dma,
6013                                                       GFP_KERNEL);
6014
6015         if (!vhost->channel_setup_buf) {
6016                 dev_err(dev, "Couldn't allocate Channel Setup buffer\n");
6017                 goto free_tgt_pool;
6018         }
6019
6020         LEAVE;
6021         return 0;
6022
6023 free_tgt_pool:
6024         mempool_destroy(vhost->tgt_pool);
6025 free_trace:
6026         kfree(vhost->trace);
6027 free_disc_buffer:
6028         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
6029                           vhost->disc_buf_dma);
6030 free_login_buffer:
6031         dma_free_coherent(dev, sizeof(*vhost->login_buf),
6032                           vhost->login_buf, vhost->login_buf_dma);
6033 free_sg_pool:
6034         dma_pool_destroy(vhost->sg_pool);
6035 unmap_async_crq:
6036         ibmvfc_free_queue(vhost, async_q);
6037 nomem:
6038         LEAVE;
6039         return -ENOMEM;
6040 }
6041
6042 /**
6043  * ibmvfc_rport_add_thread - Worker thread for rport adds
6044  * @work:       work struct
6045  *
6046  **/
6047 static void ibmvfc_rport_add_thread(struct work_struct *work)
6048 {
6049         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
6050                                                  rport_add_work_q);
6051         struct ibmvfc_target *tgt;
6052         struct fc_rport *rport;
6053         unsigned long flags;
6054         int did_work;
6055
6056         ENTER;
6057         spin_lock_irqsave(vhost->host->host_lock, flags);
6058         do {
6059                 did_work = 0;
6060                 if (vhost->state != IBMVFC_ACTIVE)
6061                         break;
6062
6063                 list_for_each_entry(tgt, &vhost->targets, queue) {
6064                         if (tgt->add_rport) {
6065                                 did_work = 1;
6066                                 tgt->add_rport = 0;
6067                                 kref_get(&tgt->kref);
6068                                 rport = tgt->rport;
6069                                 if (!rport) {
6070                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
6071                                         ibmvfc_tgt_add_rport(tgt);
6072                                 } else if (get_device(&rport->dev)) {
6073                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
6074                                         tgt_dbg(tgt, "Setting rport roles\n");
6075                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
6076                                         put_device(&rport->dev);
6077                                 } else {
6078                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
6079                                 }
6080
6081                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
6082                                 spin_lock_irqsave(vhost->host->host_lock, flags);
6083                                 break;
6084                         }
6085                 }
6086         } while(did_work);
6087
6088         if (vhost->state == IBMVFC_ACTIVE)
6089                 vhost->scan_complete = 1;
6090         spin_unlock_irqrestore(vhost->host->host_lock, flags);
6091         LEAVE;
6092 }
6093
6094 /**
6095  * ibmvfc_probe - Adapter hot plug add entry point
6096  * @vdev:       vio device struct
6097  * @id: vio device id struct
6098  *
6099  * Return value:
6100  *      0 on success / non-zero on failure
6101  **/
6102 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
6103 {
6104         struct ibmvfc_host *vhost;
6105         struct Scsi_Host *shost;
6106         struct device *dev = &vdev->dev;
6107         int rc = -ENOMEM;
6108         unsigned int max_scsi_queues = IBMVFC_MAX_SCSI_QUEUES;
6109
6110         ENTER;
6111         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
6112         if (!shost) {
6113                 dev_err(dev, "Couldn't allocate host data\n");
6114                 goto out;
6115         }
6116
6117         shost->transportt = ibmvfc_transport_template;
6118         shost->can_queue = max_requests;
6119         shost->max_lun = max_lun;
6120         shost->max_id = max_targets;
6121         shost->max_sectors = IBMVFC_MAX_SECTORS;
6122         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
6123         shost->unique_id = shost->host_no;
6124         shost->nr_hw_queues = mq_enabled ? min(max_scsi_queues, nr_scsi_hw_queues) : 1;
6125
6126         vhost = shost_priv(shost);
6127         INIT_LIST_HEAD(&vhost->targets);
6128         INIT_LIST_HEAD(&vhost->purge);
6129         sprintf(vhost->name, IBMVFC_NAME);
6130         vhost->host = shost;
6131         vhost->dev = dev;
6132         vhost->partition_number = -1;
6133         vhost->log_level = log_level;
6134         vhost->task_set = 1;
6135
6136         vhost->mq_enabled = mq_enabled;
6137         vhost->client_scsi_channels = min(shost->nr_hw_queues, nr_scsi_channels);
6138         vhost->using_channels = 0;
6139         vhost->do_enquiry = 1;
6140         vhost->scan_timeout = 0;
6141
6142         strcpy(vhost->partition_name, "UNKNOWN");
6143         init_waitqueue_head(&vhost->work_wait_q);
6144         init_waitqueue_head(&vhost->init_wait_q);
6145         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
6146         mutex_init(&vhost->passthru_mutex);
6147
6148         if ((rc = ibmvfc_alloc_mem(vhost)))
6149                 goto free_scsi_host;
6150
6151         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
6152                                          shost->host_no);
6153
6154         if (IS_ERR(vhost->work_thread)) {
6155                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
6156                         PTR_ERR(vhost->work_thread));
6157                 rc = PTR_ERR(vhost->work_thread);
6158                 goto free_host_mem;
6159         }
6160
6161         if ((rc = ibmvfc_init_crq(vhost))) {
6162                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
6163                 goto kill_kthread;
6164         }
6165
6166         if ((rc = scsi_add_host(shost, dev)))
6167                 goto release_crq;
6168
6169         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
6170
6171         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
6172                                            &ibmvfc_trace_attr))) {
6173                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
6174                 goto remove_shost;
6175         }
6176
6177         ibmvfc_init_sub_crqs(vhost);
6178
6179         if (shost_to_fc_host(shost)->rqst_q)
6180                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
6181         dev_set_drvdata(dev, vhost);
6182         spin_lock(&ibmvfc_driver_lock);
6183         list_add_tail(&vhost->queue, &ibmvfc_head);
6184         spin_unlock(&ibmvfc_driver_lock);
6185
6186         ibmvfc_send_crq_init(vhost);
6187         scsi_scan_host(shost);
6188         return 0;
6189
6190 remove_shost:
6191         scsi_remove_host(shost);
6192 release_crq:
6193         ibmvfc_release_crq_queue(vhost);
6194 kill_kthread:
6195         kthread_stop(vhost->work_thread);
6196 free_host_mem:
6197         ibmvfc_free_mem(vhost);
6198 free_scsi_host:
6199         scsi_host_put(shost);
6200 out:
6201         LEAVE;
6202         return rc;
6203 }
6204
6205 /**
6206  * ibmvfc_remove - Adapter hot plug remove entry point
6207  * @vdev:       vio device struct
6208  *
6209  * Return value:
6210  *      0
6211  **/
6212 static void ibmvfc_remove(struct vio_dev *vdev)
6213 {
6214         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
6215         LIST_HEAD(purge);
6216         unsigned long flags;
6217
6218         ENTER;
6219         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
6220
6221         spin_lock_irqsave(vhost->host->host_lock, flags);
6222         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
6223         spin_unlock_irqrestore(vhost->host->host_lock, flags);
6224
6225         ibmvfc_wait_while_resetting(vhost);
6226         kthread_stop(vhost->work_thread);
6227         fc_remove_host(vhost->host);
6228         scsi_remove_host(vhost->host);
6229
6230         spin_lock_irqsave(vhost->host->host_lock, flags);
6231         ibmvfc_purge_requests(vhost, DID_ERROR);
6232         list_splice_init(&vhost->purge, &purge);
6233         spin_unlock_irqrestore(vhost->host->host_lock, flags);
6234         ibmvfc_complete_purge(&purge);
6235         ibmvfc_release_sub_crqs(vhost);
6236         ibmvfc_release_crq_queue(vhost);
6237
6238         ibmvfc_free_mem(vhost);
6239         spin_lock(&ibmvfc_driver_lock);
6240         list_del(&vhost->queue);
6241         spin_unlock(&ibmvfc_driver_lock);
6242         scsi_host_put(vhost->host);
6243         LEAVE;
6244 }
6245
6246 /**
6247  * ibmvfc_resume - Resume from suspend
6248  * @dev:        device struct
6249  *
6250  * We may have lost an interrupt across suspend/resume, so kick the
6251  * interrupt handler
6252  *
6253  */
6254 static int ibmvfc_resume(struct device *dev)
6255 {
6256         unsigned long flags;
6257         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
6258         struct vio_dev *vdev = to_vio_dev(dev);
6259
6260         spin_lock_irqsave(vhost->host->host_lock, flags);
6261         vio_disable_interrupts(vdev);
6262         tasklet_schedule(&vhost->tasklet);
6263         spin_unlock_irqrestore(vhost->host->host_lock, flags);
6264         return 0;
6265 }
6266
6267 /**
6268  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
6269  * @vdev:       vio device struct
6270  *
6271  * Return value:
6272  *      Number of bytes the driver will need to DMA map at the same time in
6273  *      order to perform well.
6274  */
6275 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
6276 {
6277         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
6278         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
6279 }
6280
6281 static const struct vio_device_id ibmvfc_device_table[] = {
6282         {"fcp", "IBM,vfc-client"},
6283         { "", "" }
6284 };
6285 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
6286
6287 static const struct dev_pm_ops ibmvfc_pm_ops = {
6288         .resume = ibmvfc_resume
6289 };
6290
6291 static struct vio_driver ibmvfc_driver = {
6292         .id_table = ibmvfc_device_table,
6293         .probe = ibmvfc_probe,
6294         .remove = ibmvfc_remove,
6295         .get_desired_dma = ibmvfc_get_desired_dma,
6296         .name = IBMVFC_NAME,
6297         .pm = &ibmvfc_pm_ops,
6298 };
6299
6300 static struct fc_function_template ibmvfc_transport_functions = {
6301         .show_host_fabric_name = 1,
6302         .show_host_node_name = 1,
6303         .show_host_port_name = 1,
6304         .show_host_supported_classes = 1,
6305         .show_host_port_type = 1,
6306         .show_host_port_id = 1,
6307         .show_host_maxframe_size = 1,
6308
6309         .get_host_port_state = ibmvfc_get_host_port_state,
6310         .show_host_port_state = 1,
6311
6312         .get_host_speed = ibmvfc_get_host_speed,
6313         .show_host_speed = 1,
6314
6315         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
6316         .terminate_rport_io = ibmvfc_terminate_rport_io,
6317
6318         .show_rport_maxframe_size = 1,
6319         .show_rport_supported_classes = 1,
6320
6321         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
6322         .show_rport_dev_loss_tmo = 1,
6323
6324         .get_starget_node_name = ibmvfc_get_starget_node_name,
6325         .show_starget_node_name = 1,
6326
6327         .get_starget_port_name = ibmvfc_get_starget_port_name,
6328         .show_starget_port_name = 1,
6329
6330         .get_starget_port_id = ibmvfc_get_starget_port_id,
6331         .show_starget_port_id = 1,
6332
6333         .bsg_request = ibmvfc_bsg_request,
6334         .bsg_timeout = ibmvfc_bsg_timeout,
6335 };
6336
6337 /**
6338  * ibmvfc_module_init - Initialize the ibmvfc module
6339  *
6340  * Return value:
6341  *      0 on success / other on failure
6342  **/
6343 static int __init ibmvfc_module_init(void)
6344 {
6345         int rc;
6346
6347         if (!firmware_has_feature(FW_FEATURE_VIO))
6348                 return -ENODEV;
6349
6350         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
6351                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
6352
6353         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
6354         if (!ibmvfc_transport_template)
6355                 return -ENOMEM;
6356
6357         rc = vio_register_driver(&ibmvfc_driver);
6358         if (rc)
6359                 fc_release_transport(ibmvfc_transport_template);
6360         return rc;
6361 }
6362
6363 /**
6364  * ibmvfc_module_exit - Teardown the ibmvfc module
6365  *
6366  * Return value:
6367  *      nothing
6368  **/
6369 static void __exit ibmvfc_module_exit(void)
6370 {
6371         vio_unregister_driver(&ibmvfc_driver);
6372         fc_release_transport(ibmvfc_transport_template);
6373 }
6374
6375 module_init(ibmvfc_module_init);
6376 module_exit(ibmvfc_module_exit);