drivers/s390/scsi/zfcp_dbf.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Debug traces for zfcp.
   6  *
   7  * Copyright IBM Corp. 2002, 2020
   8  */
   9
  10 #define KMSG_COMPONENT "zfcp"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/module.h>
  14 #include <linux/ctype.h>
  15 #include <linux/slab.h>
  16 #include <asm/debug.h>
  17 #include "zfcp_dbf.h"
  18 #include "zfcp_ext.h"
  19 #include "zfcp_fc.h"
  20
  21 static u32 dbfsize = 4;
  22
  23 module_param(dbfsize, uint, 0400);
  24 MODULE_PARM_DESC(dbfsize,
  25                  "number of pages for each debug feature area (default 4)");
  26
  27 static u32 dbflevel = 3;
  28
  29 module_param(dbflevel, uint, 0400);
  30 MODULE_PARM_DESC(dbflevel,
  31                  "log level for each debug feature area "
  32                  "(default 3, range 0..6)");
  33
  34 static inline unsigned int zfcp_dbf_plen(unsigned int offset)
  35 {
  36         return sizeof(struct zfcp_dbf_pay) + offset - ZFCP_DBF_PAY_MAX_REC;
  37 }
  38
  39 static inline
  40 void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area,
  41                        u64 req_id)
  42 {
  43         struct zfcp_dbf_pay *pl = &dbf->pay_buf;
  44         u16 offset = 0, rec_length;
  45
  46         spin_lock(&dbf->pay_lock);
  47         memset(pl, 0, sizeof(*pl));
  48         pl->fsf_req_id = req_id;
  49         memcpy(pl->area, area, ZFCP_DBF_TAG_LEN);
  50
  51         while (offset < length) {
  52                 rec_length = min((u16) ZFCP_DBF_PAY_MAX_REC,
  53                                  (u16) (length - offset));
  54                 memcpy(pl->data, data + offset, rec_length);
  55                 debug_event(dbf->pay, 1, pl, zfcp_dbf_plen(rec_length));
  56
  57                 offset += rec_length;
  58                 pl->counter++;
  59         }
  60
  61         spin_unlock(&dbf->pay_lock);
  62 }
  63
  64 /**
  65  * zfcp_dbf_hba_fsf_res - trace event for fsf responses
  66  * @tag: tag indicating which kind of FSF response has been received
  67  * @level: trace level to be used for event
  68  * @req: request for which a response was received
  69  */
  70 void zfcp_dbf_hba_fsf_res(char *tag, int level, struct zfcp_fsf_req *req)
  71 {
  72         struct zfcp_dbf *dbf = req->adapter->dbf;
  73         struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix;
  74         struct fsf_qtcb_header *q_head = &req->qtcb->header;
  75         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
  76         unsigned long flags;
  77
  78         spin_lock_irqsave(&dbf->hba_lock, flags);
  79         memset(rec, 0, sizeof(*rec));
  80
  81         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
  82         rec->id = ZFCP_DBF_HBA_RES;
  83         rec->fsf_req_id = req->req_id;
  84         rec->fsf_req_status = req->status;
  85         rec->fsf_cmd = q_head->fsf_command;
  86         rec->fsf_seq_no = q_pref->req_seq_no;
  87         rec->u.res.req_issued = req->issued;
  88         rec->u.res.prot_status = q_pref->prot_status;
  89         rec->u.res.fsf_status = q_head->fsf_status;
  90         rec->u.res.port_handle = q_head->port_handle;
  91         rec->u.res.lun_handle = q_head->lun_handle;
  92
  93         memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual,
  94                FSF_PROT_STATUS_QUAL_SIZE);
  95         memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual,
  96                FSF_STATUS_QUALIFIER_SIZE);
  97
  98         rec->pl_len = q_head->log_length;
  99         zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start,
 100                           rec->pl_len, "fsf_res", req->req_id);
 101
 102         debug_event(dbf->hba, level, rec, sizeof(*rec));
 103         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 104 }
 105
 106 /**
 107  * zfcp_dbf_hba_fsf_fces - trace event for fsf responses related to
 108  *                         FC Endpoint Security (FCES)
 109  * @tag: tag indicating which kind of FC Endpoint Security event has occurred
 110  * @req: request for which a response was received
 111  * @wwpn: remote port or ZFCP_DBF_INVALID_WWPN
 112  * @fc_security_old: old FC Endpoint Security of FCP device or connection
 113  * @fc_security_new: new FC Endpoint Security of FCP device or connection
 114  */
 115 void zfcp_dbf_hba_fsf_fces(char *tag, const struct zfcp_fsf_req *req, u64 wwpn,
 116                            u32 fc_security_old, u32 fc_security_new)
 117 {
 118         struct zfcp_dbf *dbf = req->adapter->dbf;
 119         struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix;
 120         struct fsf_qtcb_header *q_head = &req->qtcb->header;
 121         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 122         static int const level = 3;
 123         unsigned long flags;
 124
 125         if (unlikely(!debug_level_enabled(dbf->hba, level)))
 126                 return;
 127
 128         spin_lock_irqsave(&dbf->hba_lock, flags);
 129         memset(rec, 0, sizeof(*rec));
 130
 131         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 132         rec->id = ZFCP_DBF_HBA_FCES;
 133         rec->fsf_req_id = req->req_id;
 134         rec->fsf_req_status = req->status;
 135         rec->fsf_cmd = q_head->fsf_command;
 136         rec->fsf_seq_no = q_pref->req_seq_no;
 137         rec->u.fces.req_issued = req->issued;
 138         rec->u.fces.fsf_status = q_head->fsf_status;
 139         rec->u.fces.port_handle = q_head->port_handle;
 140         rec->u.fces.wwpn = wwpn;
 141         rec->u.fces.fc_security_old = fc_security_old;
 142         rec->u.fces.fc_security_new = fc_security_new;
 143
 144         debug_event(dbf->hba, level, rec, sizeof(*rec));
 145         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 146 }
 147
 148 /**
 149  * zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer
 150  * @tag: tag indicating which kind of unsolicited status has been received
 151  * @req: request providing the unsolicited status
 152  */
 153 void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
 154 {
 155         struct zfcp_dbf *dbf = req->adapter->dbf;
 156         struct fsf_status_read_buffer *srb = req->data;
 157         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 158         static int const level = 2;
 159         unsigned long flags;
 160
 161         if (unlikely(!debug_level_enabled(dbf->hba, level)))
 162                 return;
 163
 164         spin_lock_irqsave(&dbf->hba_lock, flags);
 165         memset(rec, 0, sizeof(*rec));
 166
 167         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 168         rec->id = ZFCP_DBF_HBA_USS;
 169         rec->fsf_req_id = req->req_id;
 170         rec->fsf_req_status = req->status;
 171         rec->fsf_cmd = FSF_QTCB_UNSOLICITED_STATUS;
 172
 173         if (!srb)
 174                 goto log;
 175
 176         rec->u.uss.status_type = srb->status_type;
 177         rec->u.uss.status_subtype = srb->status_subtype;
 178         rec->u.uss.d_id = ntoh24(srb->d_id);
 179         rec->u.uss.lun = srb->fcp_lun;
 180         memcpy(&rec->u.uss.queue_designator, &srb->queue_designator,
 181                sizeof(rec->u.uss.queue_designator));
 182
 183         /* status read buffer payload length */
 184         rec->pl_len = (!srb->length) ? 0 : srb->length -
 185                         offsetof(struct fsf_status_read_buffer, payload);
 186
 187         if (rec->pl_len)
 188                 zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len,
 189                                   "fsf_uss", req->req_id);
 190 log:
 191         debug_event(dbf->hba, level, rec, sizeof(*rec));
 192         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 193 }
 194
 195 /**
 196  * zfcp_dbf_hba_bit_err - trace event for bit error conditions
 197  * @tag: tag indicating which kind of bit error unsolicited status was received
 198  * @req: request which caused the bit_error condition
 199  */
 200 void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req)
 201 {
 202         struct zfcp_dbf *dbf = req->adapter->dbf;
 203         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 204         struct fsf_status_read_buffer *sr_buf = req->data;
 205         static int const level = 1;
 206         unsigned long flags;
 207
 208         if (unlikely(!debug_level_enabled(dbf->hba, level)))
 209                 return;
 210
 211         spin_lock_irqsave(&dbf->hba_lock, flags);
 212         memset(rec, 0, sizeof(*rec));
 213
 214         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 215         rec->id = ZFCP_DBF_HBA_BIT;
 216         rec->fsf_req_id = req->req_id;
 217         rec->fsf_req_status = req->status;
 218         rec->fsf_cmd = FSF_QTCB_UNSOLICITED_STATUS;
 219         memcpy(&rec->u.be, &sr_buf->payload.bit_error,
 220                sizeof(struct fsf_bit_error_payload));
 221
 222         debug_event(dbf->hba, level, rec, sizeof(*rec));
 223         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 224 }
 225
 226 /**
 227  * zfcp_dbf_hba_def_err - trace event for deferred error messages
 228  * @adapter: pointer to struct zfcp_adapter
 229  * @req_id: request id which caused the deferred error message
 230  * @scount: number of sbals incl. the signaling sbal
 231  * @pl: array of all involved sbals
 232  */
 233 void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount,
 234                           void **pl)
 235 {
 236         struct zfcp_dbf *dbf = adapter->dbf;
 237         struct zfcp_dbf_pay *payload = &dbf->pay_buf;
 238         unsigned long flags;
 239         static int const level = 1;
 240         u16 length;
 241
 242         if (unlikely(!debug_level_enabled(dbf->pay, level)))
 243                 return;
 244
 245         if (!pl)
 246                 return;
 247
 248         spin_lock_irqsave(&dbf->pay_lock, flags);
 249         memset(payload, 0, sizeof(*payload));
 250
 251         memcpy(payload->area, "def_err", 7);
 252         payload->fsf_req_id = req_id;
 253         payload->counter = 0;
 254         length = min((u16)sizeof(struct qdio_buffer),
 255                      (u16)ZFCP_DBF_PAY_MAX_REC);
 256
 257         while (payload->counter < scount && (char *)pl[payload->counter]) {
 258                 memcpy(payload->data, (char *)pl[payload->counter], length);
 259                 debug_event(dbf->pay, level, payload, zfcp_dbf_plen(length));
 260                 payload->counter++;
 261         }
 262
 263         spin_unlock_irqrestore(&dbf->pay_lock, flags);
 264 }
 265
 266 /**
 267  * zfcp_dbf_hba_basic - trace event for basic adapter events
 268  * @tag: identifier for event
 269  * @adapter: pointer to struct zfcp_adapter
 270  */
 271 void zfcp_dbf_hba_basic(char *tag, struct zfcp_adapter *adapter)
 272 {
 273         struct zfcp_dbf *dbf = adapter->dbf;
 274         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 275         static int const level = 1;
 276         unsigned long flags;
 277
 278         if (unlikely(!debug_level_enabled(dbf->hba, level)))
 279                 return;
 280
 281         spin_lock_irqsave(&dbf->hba_lock, flags);
 282         memset(rec, 0, sizeof(*rec));
 283
 284         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 285         rec->id = ZFCP_DBF_HBA_BASIC;
 286
 287         debug_event(dbf->hba, level, rec, sizeof(*rec));
 288         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 289 }
 290
 291 static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec,
 292                                 struct zfcp_adapter *adapter,
 293                                 struct zfcp_port *port,
 294                                 struct scsi_device *sdev)
 295 {
 296         rec->adapter_status = atomic_read(&adapter->status);
 297         if (port) {
 298                 rec->port_status = atomic_read(&port->status);
 299                 rec->wwpn = port->wwpn;
 300                 rec->d_id = port->d_id;
 301         }
 302         if (sdev) {
 303                 rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status);
 304                 rec->lun = zfcp_scsi_dev_lun(sdev);
 305         } else
 306                 rec->lun = ZFCP_DBF_INVALID_LUN;
 307 }
 308
 309 /**
 310  * zfcp_dbf_rec_trig - trace event related to triggered recovery
 311  * @tag: identifier for event
 312  * @adapter: adapter on which the erp_action should run
 313  * @port: remote port involved in the erp_action
 314  * @sdev: scsi device involved in the erp_action
 315  * @want: wanted erp_action
 316  * @need: required erp_action
 317  *
 318  * The adapter->erp_lock has to be held.
 319  */
 320 void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter,
 321                        struct zfcp_port *port, struct scsi_device *sdev,
 322                        u8 want, u8 need)
 323 {
 324         struct zfcp_dbf *dbf = adapter->dbf;
 325         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 326         static int const level = 1;
 327         struct list_head *entry;
 328         unsigned long flags;
 329
 330         lockdep_assert_held(&adapter->erp_lock);
 331
 332         if (unlikely(!debug_level_enabled(dbf->rec, level)))
 333                 return;
 334
 335         spin_lock_irqsave(&dbf->rec_lock, flags);
 336         memset(rec, 0, sizeof(*rec));
 337
 338         rec->id = ZFCP_DBF_REC_TRIG;
 339         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 340         zfcp_dbf_set_common(rec, adapter, port, sdev);
 341
 342         list_for_each(entry, &adapter->erp_ready_head)
 343                 rec->u.trig.ready++;
 344
 345         list_for_each(entry, &adapter->erp_running_head)
 346                 rec->u.trig.running++;
 347
 348         rec->u.trig.want = want;
 349         rec->u.trig.need = need;
 350
 351         debug_event(dbf->rec, level, rec, sizeof(*rec));
 352         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 353 }
 354
 355 /**
 356  * zfcp_dbf_rec_trig_lock - trace event related to triggered recovery with lock
 357  * @tag: identifier for event
 358  * @adapter: adapter on which the erp_action should run
 359  * @port: remote port involved in the erp_action
 360  * @sdev: scsi device involved in the erp_action
 361  * @want: wanted erp_action
 362  * @need: required erp_action
 363  *
 364  * The adapter->erp_lock must not be held.
 365  */
 366 void zfcp_dbf_rec_trig_lock(char *tag, struct zfcp_adapter *adapter,
 367                             struct zfcp_port *port, struct scsi_device *sdev,
 368                             u8 want, u8 need)
 369 {
 370         unsigned long flags;
 371
 372         read_lock_irqsave(&adapter->erp_lock, flags);
 373         zfcp_dbf_rec_trig(tag, adapter, port, sdev, want, need);
 374         read_unlock_irqrestore(&adapter->erp_lock, flags);
 375 }
 376
 377 /**
 378  * zfcp_dbf_rec_run_lvl - trace event related to running recovery
 379  * @level: trace level to be used for event
 380  * @tag: identifier for event
 381  * @erp: erp_action running
 382  */
 383 void zfcp_dbf_rec_run_lvl(int level, char *tag, struct zfcp_erp_action *erp)
 384 {
 385         struct zfcp_dbf *dbf = erp->adapter->dbf;
 386         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 387         unsigned long flags;
 388
 389         if (!debug_level_enabled(dbf->rec, level))
 390                 return;
 391
 392         spin_lock_irqsave(&dbf->rec_lock, flags);
 393         memset(rec, 0, sizeof(*rec));
 394
 395         rec->id = ZFCP_DBF_REC_RUN;
 396         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 397         zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev);
 398
 399         rec->u.run.fsf_req_id = erp->fsf_req_id;
 400         rec->u.run.rec_status = erp->status;
 401         rec->u.run.rec_step = erp->step;
 402         rec->u.run.rec_action = erp->type;
 403
 404         if (erp->sdev)
 405                 rec->u.run.rec_count =
 406                         atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter);
 407         else if (erp->port)
 408                 rec->u.run.rec_count = atomic_read(&erp->port->erp_counter);
 409         else
 410                 rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter);
 411
 412         debug_event(dbf->rec, level, rec, sizeof(*rec));
 413         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 414 }
 415
 416 /**
 417  * zfcp_dbf_rec_run - trace event related to running recovery
 418  * @tag: identifier for event
 419  * @erp: erp_action running
 420  */
 421 void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp)
 422 {
 423         zfcp_dbf_rec_run_lvl(1, tag, erp);
 424 }
 425
 426 /**
 427  * zfcp_dbf_rec_run_wka - trace wka port event with info like running recovery
 428  * @tag: identifier for event
 429  * @wka_port: well known address port
 430  * @req_id: request ID to correlate with potential HBA trace record
 431  */
 432 void zfcp_dbf_rec_run_wka(char *tag, struct zfcp_fc_wka_port *wka_port,
 433                           u64 req_id)
 434 {
 435         struct zfcp_dbf *dbf = wka_port->adapter->dbf;
 436         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 437         static int const level = 1;
 438         unsigned long flags;
 439
 440         if (unlikely(!debug_level_enabled(dbf->rec, level)))
 441                 return;
 442
 443         spin_lock_irqsave(&dbf->rec_lock, flags);
 444         memset(rec, 0, sizeof(*rec));
 445
 446         rec->id = ZFCP_DBF_REC_RUN;
 447         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 448         rec->port_status = wka_port->status;
 449         rec->d_id = wka_port->d_id;
 450         rec->lun = ZFCP_DBF_INVALID_LUN;
 451
 452         rec->u.run.fsf_req_id = req_id;
 453         rec->u.run.rec_status = ~0;
 454         rec->u.run.rec_step = ~0;
 455         rec->u.run.rec_action = ~0;
 456         rec->u.run.rec_count = ~0;
 457
 458         debug_event(dbf->rec, level, rec, sizeof(*rec));
 459         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 460 }
 461
 462 #define ZFCP_DBF_SAN_LEVEL 1
 463
 464 static inline
 465 void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf,
 466                   char *paytag, struct scatterlist *sg, u8 id, u16 len,
 467                   u64 req_id, u32 d_id, u16 cap_len)
 468 {
 469         struct zfcp_dbf_san *rec = &dbf->san_buf;
 470         u16 rec_len;
 471         unsigned long flags;
 472         struct zfcp_dbf_pay *payload = &dbf->pay_buf;
 473         u16 pay_sum = 0;
 474
 475         spin_lock_irqsave(&dbf->san_lock, flags);
 476         memset(rec, 0, sizeof(*rec));
 477
 478         rec->id = id;
 479         rec->fsf_req_id = req_id;
 480         rec->d_id = d_id;
 481         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 482         rec->pl_len = len; /* full length even if we cap pay below */
 483         if (!sg)
 484                 goto out;
 485         rec_len = min_t(unsigned int, sg->length, ZFCP_DBF_SAN_MAX_PAYLOAD);
 486         memcpy(rec->payload, sg_virt(sg), rec_len); /* part of 1st sg entry */
 487         if (len <= rec_len)
 488                 goto out; /* skip pay record if full content in rec->payload */
 489
 490         /* if (len > rec_len):
 491          * dump data up to cap_len ignoring small duplicate in rec->payload
 492          */
 493         spin_lock(&dbf->pay_lock);
 494         memset(payload, 0, sizeof(*payload));
 495         memcpy(payload->area, paytag, ZFCP_DBF_TAG_LEN);
 496         payload->fsf_req_id = req_id;
 497         payload->counter = 0;
 498         for (; sg && pay_sum < cap_len; sg = sg_next(sg)) {
 499                 u16 pay_len, offset = 0;
 500
 501                 while (offset < sg->length && pay_sum < cap_len) {
 502                         pay_len = min((u16)ZFCP_DBF_PAY_MAX_REC,
 503                                       (u16)(sg->length - offset));
 504                         /* cap_len <= pay_sum < cap_len+ZFCP_DBF_PAY_MAX_REC */
 505                         memcpy(payload->data, sg_virt(sg) + offset, pay_len);
 506                         debug_event(dbf->pay, ZFCP_DBF_SAN_LEVEL, payload,
 507                                     zfcp_dbf_plen(pay_len));
 508                         payload->counter++;
 509                         offset += pay_len;
 510                         pay_sum += pay_len;
 511                 }
 512         }
 513         spin_unlock(&dbf->pay_lock);
 514
 515 out:
 516         debug_event(dbf->san, ZFCP_DBF_SAN_LEVEL, rec, sizeof(*rec));
 517         spin_unlock_irqrestore(&dbf->san_lock, flags);
 518 }
 519
 520 /**
 521  * zfcp_dbf_san_req - trace event for issued SAN request
 522  * @tag: identifier for event
 523  * @fsf: request containing issued CT or ELS data
 524  * @d_id: N_Port_ID where SAN request is sent to
 525  * d_id: destination ID
 526  */
 527 void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
 528 {
 529         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 530         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 531         u16 length;
 532
 533         if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL)))
 534                 return;
 535
 536         length = (u16)zfcp_qdio_real_bytes(ct_els->req);
 537         zfcp_dbf_san(tag, dbf, "san_req", ct_els->req, ZFCP_DBF_SAN_REQ,
 538                      length, fsf->req_id, d_id, length);
 539 }
 540
 541 static u16 zfcp_dbf_san_res_cap_len_if_gpn_ft(char *tag,
 542                                               struct zfcp_fsf_req *fsf,
 543                                               u16 len)
 544 {
 545         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 546         struct fc_ct_hdr *reqh = sg_virt(ct_els->req);
 547         struct fc_ns_gid_ft *reqn = (struct fc_ns_gid_ft *)(reqh + 1);
 548         struct scatterlist *resp_entry = ct_els->resp;
 549         struct fc_ct_hdr *resph;
 550         struct fc_gpn_ft_resp *acc;
 551         int max_entries, x, last = 0;
 552
 553         if (!(memcmp(tag, "fsscth2", 7) == 0
 554               && ct_els->d_id == FC_FID_DIR_SERV
 555               && reqh->ct_rev == FC_CT_REV
 556               && reqh->ct_in_id[0] == 0
 557               && reqh->ct_in_id[1] == 0
 558               && reqh->ct_in_id[2] == 0
 559               && reqh->ct_fs_type == FC_FST_DIR
 560               && reqh->ct_fs_subtype == FC_NS_SUBTYPE
 561               && reqh->ct_options == 0
 562               && reqh->_ct_resvd1 == 0
 563               && reqh->ct_cmd == cpu_to_be16(FC_NS_GPN_FT)
 564               /* reqh->ct_mr_size can vary so do not match but read below */
 565               && reqh->_ct_resvd2 == 0
 566               && reqh->ct_reason == 0
 567               && reqh->ct_explan == 0
 568               && reqh->ct_vendor == 0
 569               && reqn->fn_resvd == 0
 570               && reqn->fn_domain_id_scope == 0
 571               && reqn->fn_area_id_scope == 0
 572               && reqn->fn_fc4_type == FC_TYPE_FCP))
 573                 return len; /* not GPN_FT response so do not cap */
 574
 575         acc = sg_virt(resp_entry);
 576
 577         /* cap all but accept CT responses to at least the CT header */
 578         resph = (struct fc_ct_hdr *)acc;
 579         if ((ct_els->status) ||
 580             (resph->ct_cmd != cpu_to_be16(FC_FS_ACC)))
 581                 return max(FC_CT_HDR_LEN, ZFCP_DBF_SAN_MAX_PAYLOAD);
 582
 583         max_entries = (be16_to_cpu(reqh->ct_mr_size) * 4 /
 584                        sizeof(struct fc_gpn_ft_resp))
 585                 + 1 /* zfcp_fc_scan_ports: bytes correct, entries off-by-one
 586                      * to account for header as 1st pseudo "entry" */;
 587
 588         /* the basic CT_IU preamble is the same size as one entry in the GPN_FT
 589          * response, allowing us to skip special handling for it - just skip it
 590          */
 591         for (x = 1; x < max_entries && !last; x++) {
 592                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 593                         acc++;
 594                 else
 595                         acc = sg_virt(++resp_entry);
 596
 597                 last = acc->fp_flags & FC_NS_FID_LAST;
 598         }
 599         len = min(len, (u16)(x * sizeof(struct fc_gpn_ft_resp)));
 600         return len; /* cap after last entry */
 601 }
 602
 603 /**
 604  * zfcp_dbf_san_res - trace event for received SAN request
 605  * @tag: identifier for event
 606  * @fsf: request containing received CT or ELS data
 607  */
 608 void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
 609 {
 610         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 611         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 612         u16 length;
 613
 614         if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL)))
 615                 return;
 616
 617         length = (u16)zfcp_qdio_real_bytes(ct_els->resp);
 618         zfcp_dbf_san(tag, dbf, "san_res", ct_els->resp, ZFCP_DBF_SAN_RES,
 619                      length, fsf->req_id, ct_els->d_id,
 620                      zfcp_dbf_san_res_cap_len_if_gpn_ft(tag, fsf, length));
 621 }
 622
 623 /**
 624  * zfcp_dbf_san_in_els - trace event for incoming ELS
 625  * @tag: identifier for event
 626  * @fsf: request containing received ELS data
 627  */
 628 void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
 629 {
 630         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 631         struct fsf_status_read_buffer *srb =
 632                 (struct fsf_status_read_buffer *) fsf->data;
 633         u16 length;
 634         struct scatterlist sg;
 635
 636         if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL)))
 637                 return;
 638
 639         length = (u16)(srb->length -
 640                         offsetof(struct fsf_status_read_buffer, payload));
 641         sg_init_one(&sg, srb->payload.data, length);
 642         zfcp_dbf_san(tag, dbf, "san_els", &sg, ZFCP_DBF_SAN_ELS, length,
 643                      fsf->req_id, ntoh24(srb->d_id), length);
 644 }
 645
 646 /**
 647  * zfcp_dbf_scsi_common() - Common trace event helper for scsi.
 648  * @tag: Identifier for event.
 649  * @level: trace level of event.
 650  * @sdev: Pointer to SCSI device as context for this event.
 651  * @sc: Pointer to SCSI command, or NULL with task management function (TMF).
 652  * @fsf: Pointer to FSF request, or NULL.
 653  */
 654 void zfcp_dbf_scsi_common(char *tag, int level, struct scsi_device *sdev,
 655                           struct scsi_cmnd *sc, struct zfcp_fsf_req *fsf)
 656 {
 657         struct zfcp_adapter *adapter =
 658                 (struct zfcp_adapter *) sdev->host->hostdata[0];
 659         struct zfcp_dbf *dbf = adapter->dbf;
 660         struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
 661         struct fcp_resp_with_ext *fcp_rsp;
 662         struct fcp_resp_rsp_info *fcp_rsp_info;
 663         unsigned long flags;
 664
 665         spin_lock_irqsave(&dbf->scsi_lock, flags);
 666         memset(rec, 0, sizeof(*rec));
 667
 668         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 669         rec->id = ZFCP_DBF_SCSI_CMND;
 670         if (sc) {
 671                 rec->scsi_result = sc->result;
 672                 rec->scsi_retries = sc->retries;
 673                 rec->scsi_allowed = sc->allowed;
 674                 rec->scsi_id = sc->device->id;
 675                 rec->scsi_lun = (u32)sc->device->lun;
 676                 rec->scsi_lun_64_hi = (u32)(sc->device->lun >> 32);
 677                 rec->host_scribble = (unsigned long)sc->host_scribble;
 678
 679                 memcpy(rec->scsi_opcode, sc->cmnd,
 680                        min_t(int, sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
 681         } else {
 682                 rec->scsi_result = ~0;
 683                 rec->scsi_retries = ~0;
 684                 rec->scsi_allowed = ~0;
 685                 rec->scsi_id = sdev->id;
 686                 rec->scsi_lun = (u32)sdev->lun;
 687                 rec->scsi_lun_64_hi = (u32)(sdev->lun >> 32);
 688                 rec->host_scribble = ~0;
 689
 690                 memset(rec->scsi_opcode, 0xff, ZFCP_DBF_SCSI_OPCODE);
 691         }
 692
 693         if (fsf) {
 694                 rec->fsf_req_id = fsf->req_id;
 695                 rec->pl_len = FCP_RESP_WITH_EXT;
 696                 fcp_rsp = &(fsf->qtcb->bottom.io.fcp_rsp.iu);
 697                 /* mandatory parts of FCP_RSP IU in this SCSI record */
 698                 memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT);
 699                 if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) {
 700                         fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
 701                         rec->fcp_rsp_info = fcp_rsp_info->rsp_code;
 702                         rec->pl_len += be32_to_cpu(fcp_rsp->ext.fr_rsp_len);
 703                 }
 704                 if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) {
 705                         rec->pl_len += be32_to_cpu(fcp_rsp->ext.fr_sns_len);
 706                 }
 707                 /* complete FCP_RSP IU in associated PAYload record
 708                  * but only if there are optional parts
 709                  */
 710                 if (fcp_rsp->resp.fr_flags != 0)
 711                         zfcp_dbf_pl_write(
 712                                 dbf, fcp_rsp,
 713                                 /* at least one full PAY record
 714                                  * but not beyond hardware response field
 715                                  */
 716                                 min_t(u16, max_t(u16, rec->pl_len,
 717                                                  ZFCP_DBF_PAY_MAX_REC),
 718                                       FSF_FCP_RSP_SIZE),
 719                                 "fcp_riu", fsf->req_id);
 720         }
 721
 722         debug_event(dbf->scsi, level, rec, sizeof(*rec));
 723         spin_unlock_irqrestore(&dbf->scsi_lock, flags);
 724 }
 725
 726 /**
 727  * zfcp_dbf_scsi_eh() - Trace event for special cases of scsi_eh callbacks.
 728  * @tag: Identifier for event.
 729  * @adapter: Pointer to zfcp adapter as context for this event.
 730  * @scsi_id: SCSI ID/target to indicate scope of task management function (TMF).
 731  * @ret: Return value of calling function.
 732  *
 733  * This SCSI trace variant does not depend on any of:
 734  * scsi_cmnd, zfcp_fsf_req, scsi_device.
 735  */
 736 void zfcp_dbf_scsi_eh(char *tag, struct zfcp_adapter *adapter,
 737                       unsigned int scsi_id, int ret)
 738 {
 739         struct zfcp_dbf *dbf = adapter->dbf;
 740         struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
 741         unsigned long flags;
 742         static int const level = 1;
 743
 744         if (unlikely(!debug_level_enabled(adapter->dbf->scsi, level)))
 745                 return;
 746
 747         spin_lock_irqsave(&dbf->scsi_lock, flags);
 748         memset(rec, 0, sizeof(*rec));
 749
 750         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 751         rec->id = ZFCP_DBF_SCSI_CMND;
 752         rec->scsi_result = ret; /* re-use field, int is 4 bytes and fits */
 753         rec->scsi_retries = ~0;
 754         rec->scsi_allowed = ~0;
 755         rec->fcp_rsp_info = ~0;
 756         rec->scsi_id = scsi_id;
 757         rec->scsi_lun = (u32)ZFCP_DBF_INVALID_LUN;
 758         rec->scsi_lun_64_hi = (u32)(ZFCP_DBF_INVALID_LUN >> 32);
 759         rec->host_scribble = ~0;
 760         memset(rec->scsi_opcode, 0xff, ZFCP_DBF_SCSI_OPCODE);
 761
 762         debug_event(dbf->scsi, level, rec, sizeof(*rec));
 763         spin_unlock_irqrestore(&dbf->scsi_lock, flags);
 764 }
 765
 766 static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size)
 767 {
 768         struct debug_info *d;
 769
 770         d = debug_register(name, size, 1, rec_size);
 771         if (!d)
 772                 return NULL;
 773
 774         debug_register_view(d, &debug_hex_ascii_view);
 775         debug_set_level(d, dbflevel);
 776
 777         return d;
 778 }
 779
 780 static void zfcp_dbf_unregister(struct zfcp_dbf *dbf)
 781 {
 782         if (!dbf)
 783                 return;
 784
 785         debug_unregister(dbf->scsi);
 786         debug_unregister(dbf->san);
 787         debug_unregister(dbf->hba);
 788         debug_unregister(dbf->pay);
 789         debug_unregister(dbf->rec);
 790         kfree(dbf);
 791 }
 792
 793 /**
 794  * zfcp_adapter_debug_register - registers debug feature for an adapter
 795  * @adapter: pointer to adapter for which debug features should be registered
 796  * return: -ENOMEM on error, 0 otherwise
 797  */
 798 int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter)
 799 {
 800         char name[DEBUG_MAX_NAME_LEN];
 801         struct zfcp_dbf *dbf;
 802
 803         dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL);
 804         if (!dbf)
 805                 return -ENOMEM;
 806
 807         spin_lock_init(&dbf->pay_lock);
 808         spin_lock_init(&dbf->hba_lock);
 809         spin_lock_init(&dbf->san_lock);
 810         spin_lock_init(&dbf->scsi_lock);
 811         spin_lock_init(&dbf->rec_lock);
 812
 813         /* debug feature area which records recovery activity */
 814         sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev));
 815         dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec));
 816         if (!dbf->rec)
 817                 goto err_out;
 818
 819         /* debug feature area which records HBA (FSF and QDIO) conditions */
 820         sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev));
 821         dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba));
 822         if (!dbf->hba)
 823                 goto err_out;
 824
 825         /* debug feature area which records payload info */
 826         sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev));
 827         dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay));
 828         if (!dbf->pay)
 829                 goto err_out;
 830
 831         /* debug feature area which records SAN command failures and recovery */
 832         sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev));
 833         dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san));
 834         if (!dbf->san)
 835                 goto err_out;
 836
 837         /* debug feature area which records SCSI command failures and recovery */
 838         sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev));
 839         dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi));
 840         if (!dbf->scsi)
 841                 goto err_out;
 842
 843         adapter->dbf = dbf;
 844
 845         return 0;
 846 err_out:
 847         zfcp_dbf_unregister(dbf);
 848         return -ENOMEM;
 849 }
 850
 851 /**
 852  * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
 853  * @adapter: pointer to adapter for which debug features should be unregistered
 854  */
 855 void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter)
 856 {
 857         struct zfcp_dbf *dbf = adapter->dbf;
 858
 859         adapter->dbf = NULL;
 860         zfcp_dbf_unregister(dbf);
 861 }
 862