drivers/s390/cio/chsc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *   S/390 common I/O routines -- channel subsystem call
   4  *
   5  *    Copyright IBM Corp. 1999,2012
   6  *    Author(s): Ingo Adlung (adlung@de.ibm.com)
   7  *               Cornelia Huck (cornelia.huck@de.ibm.com)
   8  *               Arnd Bergmann (arndb@de.ibm.com)
   9  */
  10
  11 #define KMSG_COMPONENT "cio"
  12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/init.h>
  17 #include <linux/device.h>
  18 #include <linux/mutex.h>
  19 #include <linux/pci.h>
  20
  21 #include <asm/cio.h>
  22 #include <asm/chpid.h>
  23 #include <asm/chsc.h>
  24 #include <asm/crw.h>
  25 #include <asm/isc.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/ap.h>
  28
  29 #include "css.h"
  30 #include "cio.h"
  31 #include "cio_debug.h"
  32 #include "ioasm.h"
  33 #include "chp.h"
  34 #include "chsc.h"
  35
  36 static void *sei_page;
  37 static void *chsc_page;
  38 static DEFINE_SPINLOCK(chsc_page_lock);
  39
  40 /**
  41  * chsc_error_from_response() - convert a chsc response to an error
  42  * @response: chsc response code
  43  *
  44  * Returns an appropriate Linux error code for @response.
  45  */
  46 int chsc_error_from_response(int response)
  47 {
  48         switch (response) {
  49         case 0x0001:
  50                 return 0;
  51         case 0x0002:
  52         case 0x0003:
  53         case 0x0006:
  54         case 0x0007:
  55         case 0x0008:
  56         case 0x000a:
  57         case 0x0104:
  58                 return -EINVAL;
  59         case 0x0004:
  60         case 0x0106:            /* "Wrong Channel Parm" for the op 0x003d */
  61                 return -EOPNOTSUPP;
  62         case 0x000b:
  63         case 0x0107:            /* "Channel busy" for the op 0x003d */
  64                 return -EBUSY;
  65         case 0x0100:
  66         case 0x0102:
  67                 return -ENOMEM;
  68         case 0x0108:            /* "HW limit exceeded" for the op 0x003d */
  69                 return -EUSERS;
  70         default:
  71                 return -EIO;
  72         }
  73 }
  74 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  75
  76 struct chsc_ssd_area {
  77         struct chsc_header request;
  78         u16 :10;
  79         u16 ssid:2;
  80         u16 :4;
  81         u16 f_sch;        /* first subchannel */
  82         u16 :16;
  83         u16 l_sch;        /* last subchannel */
  84         u32 :32;
  85         struct chsc_header response;
  86         u32 :32;
  87         u8 sch_valid : 1;
  88         u8 dev_valid : 1;
  89         u8 st        : 3; /* subchannel type */
  90         u8 zeroes    : 3;
  91         u8  unit_addr;    /* unit address */
  92         u16 devno;        /* device number */
  93         u8 path_mask;
  94         u8 fla_valid_mask;
  95         u16 sch;          /* subchannel */
  96         u8 chpid[8];      /* chpids 0-7 */
  97         u16 fla[8];       /* full link addresses 0-7 */
  98 } __packed __aligned(PAGE_SIZE);
  99
 100 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
 101 {
 102         struct chsc_ssd_area *ssd_area;
 103         unsigned long flags;
 104         int ccode;
 105         int ret;
 106         int i;
 107         int mask;
 108
 109         spin_lock_irqsave(&chsc_page_lock, flags);
 110         memset(chsc_page, 0, PAGE_SIZE);
 111         ssd_area = chsc_page;
 112         ssd_area->request.length = 0x0010;
 113         ssd_area->request.code = 0x0004;
 114         ssd_area->ssid = schid.ssid;
 115         ssd_area->f_sch = schid.sch_no;
 116         ssd_area->l_sch = schid.sch_no;
 117
 118         ccode = chsc(ssd_area);
 119         /* Check response. */
 120         if (ccode > 0) {
 121                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 122                 goto out;
 123         }
 124         ret = chsc_error_from_response(ssd_area->response.code);
 125         if (ret != 0) {
 126                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 127                               schid.ssid, schid.sch_no,
 128                               ssd_area->response.code);
 129                 goto out;
 130         }
 131         if (!ssd_area->sch_valid) {
 132                 ret = -ENODEV;
 133                 goto out;
 134         }
 135         /* Copy data */
 136         ret = 0;
 137         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 138         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 139             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 140                 goto out;
 141         ssd->path_mask = ssd_area->path_mask;
 142         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 143         for (i = 0; i < 8; i++) {
 144                 mask = 0x80 >> i;
 145                 if (ssd_area->path_mask & mask) {
 146                         chp_id_init(&ssd->chpid[i]);
 147                         ssd->chpid[i].id = ssd_area->chpid[i];
 148                 }
 149                 if (ssd_area->fla_valid_mask & mask)
 150                         ssd->fla[i] = ssd_area->fla[i];
 151         }
 152 out:
 153         spin_unlock_irqrestore(&chsc_page_lock, flags);
 154         return ret;
 155 }
 156
 157 /**
 158  * chsc_ssqd() - store subchannel QDIO data (SSQD)
 159  * @schid: id of the subchannel on which SSQD is performed
 160  * @ssqd: request and response block for SSQD
 161  *
 162  * Returns 0 on success.
 163  */
 164 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 165 {
 166         memset(ssqd, 0, sizeof(*ssqd));
 167         ssqd->request.length = 0x0010;
 168         ssqd->request.code = 0x0024;
 169         ssqd->first_sch = schid.sch_no;
 170         ssqd->last_sch = schid.sch_no;
 171         ssqd->ssid = schid.ssid;
 172
 173         if (chsc(ssqd))
 174                 return -EIO;
 175
 176         return chsc_error_from_response(ssqd->response.code);
 177 }
 178 EXPORT_SYMBOL_GPL(chsc_ssqd);
 179
 180 /**
 181  * chsc_sadc() - set adapter device controls (SADC)
 182  * @schid: id of the subchannel on which SADC is performed
 183  * @scssc: request and response block for SADC
 184  * @summary_indicator_addr: summary indicator address
 185  * @subchannel_indicator_addr: subchannel indicator address
 186  * @isc: Interruption Subclass for this subchannel
 187  *
 188  * Returns 0 on success.
 189  */
 190 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
 191               u64 summary_indicator_addr, u64 subchannel_indicator_addr, u8 isc)
 192 {
 193         memset(scssc, 0, sizeof(*scssc));
 194         scssc->request.length = 0x0fe0;
 195         scssc->request.code = 0x0021;
 196         scssc->operation_code = 0;
 197
 198         scssc->summary_indicator_addr = summary_indicator_addr;
 199         scssc->subchannel_indicator_addr = subchannel_indicator_addr;
 200
 201         scssc->ks = PAGE_DEFAULT_KEY >> 4;
 202         scssc->kc = PAGE_DEFAULT_KEY >> 4;
 203         scssc->isc = isc;
 204         scssc->schid = schid;
 205
 206         /* enable the time delay disablement facility */
 207         if (css_general_characteristics.aif_tdd)
 208                 scssc->word_with_d_bit = 0x10000000;
 209
 210         if (chsc(scssc))
 211                 return -EIO;
 212
 213         return chsc_error_from_response(scssc->response.code);
 214 }
 215 EXPORT_SYMBOL_GPL(chsc_sadc);
 216
 217 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 218 {
 219         spin_lock_irq(sch->lock);
 220         if (sch->driver && sch->driver->chp_event)
 221                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 222                         goto out_unreg;
 223         spin_unlock_irq(sch->lock);
 224         return 0;
 225
 226 out_unreg:
 227         sch->lpm = 0;
 228         spin_unlock_irq(sch->lock);
 229         css_schedule_eval(sch->schid);
 230         return 0;
 231 }
 232
 233 void chsc_chp_offline(struct chp_id chpid)
 234 {
 235         struct channel_path *chp = chpid_to_chp(chpid);
 236         struct chp_link link;
 237         char dbf_txt[15];
 238
 239         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 240         CIO_TRACE_EVENT(2, dbf_txt);
 241
 242         if (chp_get_status(chpid) <= 0)
 243                 return;
 244         memset(&link, 0, sizeof(struct chp_link));
 245         link.chpid = chpid;
 246         /* Wait until previous actions have settled. */
 247         css_wait_for_slow_path();
 248
 249         mutex_lock(&chp->lock);
 250         chp_update_desc(chp);
 251         mutex_unlock(&chp->lock);
 252
 253         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 254 }
 255
 256 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 257 {
 258         spin_lock_irq(sch->lock);
 259         if (sch->driver && sch->driver->chp_event)
 260                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 261         spin_unlock_irq(sch->lock);
 262
 263         return 0;
 264 }
 265
 266 static void s390_process_res_acc(struct chp_link *link)
 267 {
 268         char dbf_txt[15];
 269
 270         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 271                 link->chpid.id);
 272         CIO_TRACE_EVENT( 2, dbf_txt);
 273         if (link->fla != 0) {
 274                 sprintf(dbf_txt, "fla%x", link->fla);
 275                 CIO_TRACE_EVENT( 2, dbf_txt);
 276         }
 277         /* Wait until previous actions have settled. */
 278         css_wait_for_slow_path();
 279         /*
 280          * I/O resources may have become accessible.
 281          * Scan through all subchannels that may be concerned and
 282          * do a validation on those.
 283          * The more information we have (info), the less scanning
 284          * will we have to do.
 285          */
 286         for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
 287         css_schedule_reprobe();
 288 }
 289
 290 struct chsc_sei_nt0_area {
 291         u8  flags;
 292         u8  vf;                         /* validity flags */
 293         u8  rs;                         /* reporting source */
 294         u8  cc;                         /* content code */
 295         u16 fla;                        /* full link address */
 296         u16 rsid;                       /* reporting source id */
 297         u32 reserved1;
 298         u32 reserved2;
 299         /* ccdf has to be big enough for a link-incident record */
 300         u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 301 } __packed;
 302
 303 struct chsc_sei_nt2_area {
 304         u8  flags;                      /* p and v bit */
 305         u8  reserved1;
 306         u8  reserved2;
 307         u8  cc;                         /* content code */
 308         u32 reserved3[13];
 309         u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 310 } __packed;
 311
 312 #define CHSC_SEI_NT0    (1ULL << 63)
 313 #define CHSC_SEI_NT2    (1ULL << 61)
 314
 315 struct chsc_sei {
 316         struct chsc_header request;
 317         u32 reserved1;
 318         u64 ntsm;                       /* notification type mask */
 319         struct chsc_header response;
 320         u32 :24;
 321         u8 nt;
 322         union {
 323                 struct chsc_sei_nt0_area nt0_area;
 324                 struct chsc_sei_nt2_area nt2_area;
 325                 u8 nt_area[PAGE_SIZE - 24];
 326         } u;
 327 } __packed __aligned(PAGE_SIZE);
 328
 329 /*
 330  * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
 331  */
 332
 333 #define LIR_IQ_CLASS_INFO               0
 334 #define LIR_IQ_CLASS_DEGRADED           1
 335 #define LIR_IQ_CLASS_NOT_OPERATIONAL    2
 336
 337 struct lir {
 338         struct {
 339                 u32 null:1;
 340                 u32 reserved:3;
 341                 u32 class:2;
 342                 u32 reserved2:2;
 343         } __packed iq;
 344         u32 ic:8;
 345         u32 reserved:16;
 346         struct node_descriptor incident_node;
 347         struct node_descriptor attached_node;
 348         u8 reserved2[32];
 349 } __packed;
 350
 351 #define PARAMS_LEN      10      /* PARAMS=xx,xxxxxx */
 352 #define NODEID_LEN      35      /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 353
 354 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
 355 static char *store_ebcdic(char *dest, const char *src, unsigned long len,
 356                           char delim)
 357 {
 358         memcpy(dest, src, len);
 359         EBCASC(dest, len);
 360
 361         if (delim)
 362                 dest[len++] = delim;
 363
 364         return dest + len;
 365 }
 366
 367 /* Format node ID and parameters for output in LIR log message. */
 368 static void format_node_data(char *params, char *id, struct node_descriptor *nd)
 369 {
 370         memset(params, 0, PARAMS_LEN);
 371         memset(id, 0, NODEID_LEN);
 372
 373         if (nd->validity != ND_VALIDITY_VALID) {
 374                 strncpy(params, "n/a", PARAMS_LEN - 1);
 375                 strncpy(id, "n/a", NODEID_LEN - 1);
 376                 return;
 377         }
 378
 379         /* PARAMS=xx,xxxxxx */
 380         snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
 381         /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 382         id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
 383         id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
 384         id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
 385         id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
 386         id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
 387         sprintf(id, "%04X", nd->tag);
 388 }
 389
 390 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 391 {
 392         struct lir *lir = (struct lir *) &sei_area->ccdf;
 393         char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
 394              aunodeid[NODEID_LEN];
 395
 396         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
 397                       sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
 398
 399         /* Ignore NULL Link Incident Records. */
 400         if (lir->iq.null)
 401                 return;
 402
 403         /* Inform user that a link requires maintenance actions because it has
 404          * become degraded or not operational. Note that this log message is
 405          * the primary intention behind a Link Incident Record. */
 406
 407         format_node_data(iuparams, iunodeid, &lir->incident_node);
 408         format_node_data(auparams, aunodeid, &lir->attached_node);
 409
 410         switch (lir->iq.class) {
 411         case LIR_IQ_CLASS_DEGRADED:
 412                 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
 413                         "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 414                         sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 415                         iunodeid, auparams, aunodeid);
 416                 break;
 417         case LIR_IQ_CLASS_NOT_OPERATIONAL:
 418                 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
 419                        "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 420                        sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 421                        iunodeid, auparams, aunodeid);
 422                 break;
 423         default:
 424                 break;
 425         }
 426 }
 427
 428 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 429 {
 430         struct channel_path *chp;
 431         struct chp_link link;
 432         struct chp_id chpid;
 433         int status;
 434
 435         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 436                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 437         if (sei_area->rs != 4)
 438                 return;
 439         chp_id_init(&chpid);
 440         chpid.id = sei_area->rsid;
 441         /* allocate a new channel path structure, if needed */
 442         status = chp_get_status(chpid);
 443         if (!status)
 444                 return;
 445
 446         if (status < 0) {
 447                 chp_new(chpid);
 448         } else {
 449                 chp = chpid_to_chp(chpid);
 450                 mutex_lock(&chp->lock);
 451                 chp_update_desc(chp);
 452                 mutex_unlock(&chp->lock);
 453         }
 454         memset(&link, 0, sizeof(struct chp_link));
 455         link.chpid = chpid;
 456         if ((sei_area->vf & 0xc0) != 0) {
 457                 link.fla = sei_area->fla;
 458                 if ((sei_area->vf & 0xc0) == 0xc0)
 459                         /* full link address */
 460                         link.fla_mask = 0xffff;
 461                 else
 462                         /* link address */
 463                         link.fla_mask = 0xff00;
 464         }
 465         s390_process_res_acc(&link);
 466 }
 467
 468 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 469 {
 470         struct channel_path *chp;
 471         struct chp_id chpid;
 472         u8 *data;
 473         int num;
 474
 475         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 476         if (sei_area->rs != 0)
 477                 return;
 478         data = sei_area->ccdf;
 479         chp_id_init(&chpid);
 480         for (num = 0; num <= __MAX_CHPID; num++) {
 481                 if (!chp_test_bit(data, num))
 482                         continue;
 483                 chpid.id = num;
 484
 485                 CIO_CRW_EVENT(4, "Update information for channel path "
 486                               "%x.%02x\n", chpid.cssid, chpid.id);
 487                 chp = chpid_to_chp(chpid);
 488                 if (!chp) {
 489                         chp_new(chpid);
 490                         continue;
 491                 }
 492                 mutex_lock(&chp->lock);
 493                 chp_update_desc(chp);
 494                 mutex_unlock(&chp->lock);
 495         }
 496 }
 497
 498 struct chp_config_data {
 499         u8 map[32];
 500         u8 op;
 501         u8 pc;
 502 };
 503
 504 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 505 {
 506         struct chp_config_data *data;
 507         struct chp_id chpid;
 508         int num;
 509         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 510
 511         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 512         if (sei_area->rs != 0)
 513                 return;
 514         data = (struct chp_config_data *) &(sei_area->ccdf);
 515         chp_id_init(&chpid);
 516         for (num = 0; num <= __MAX_CHPID; num++) {
 517                 if (!chp_test_bit(data->map, num))
 518                         continue;
 519                 chpid.id = num;
 520                 pr_notice("Processing %s for channel path %x.%02x\n",
 521                           events[data->op], chpid.cssid, chpid.id);
 522                 switch (data->op) {
 523                 case 0:
 524                         chp_cfg_schedule(chpid, 1);
 525                         break;
 526                 case 1:
 527                         chp_cfg_schedule(chpid, 0);
 528                         break;
 529                 case 2:
 530                         chp_cfg_cancel_deconfigure(chpid);
 531                         break;
 532                 }
 533         }
 534 }
 535
 536 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 537 {
 538         int ret;
 539
 540         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 541         if (sei_area->rs != 7)
 542                 return;
 543
 544         ret = scm_update_information();
 545         if (ret)
 546                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 547                               " failed (rc=%d).\n", ret);
 548 }
 549
 550 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 551 {
 552         int ret;
 553
 554         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 555         if (sei_area->rs != 7)
 556                 return;
 557
 558         ret = scm_process_availability_information();
 559         if (ret)
 560                 CIO_CRW_EVENT(0, "chsc: process availability information"
 561                               " failed (rc=%d).\n", ret);
 562 }
 563
 564 static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
 565 {
 566         CIO_CRW_EVENT(3, "chsc: ap config changed\n");
 567         if (sei_area->rs != 5)
 568                 return;
 569
 570         ap_bus_cfg_chg();
 571 }
 572
 573 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 574 {
 575         switch (sei_area->cc) {
 576         case 1:
 577                 zpci_event_error(sei_area->ccdf);
 578                 break;
 579         case 2:
 580                 zpci_event_availability(sei_area->ccdf);
 581                 break;
 582         default:
 583                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 584                               sei_area->cc);
 585                 break;
 586         }
 587 }
 588
 589 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 590 {
 591         /* which kind of information was stored? */
 592         switch (sei_area->cc) {
 593         case 1: /* link incident*/
 594                 chsc_process_sei_link_incident(sei_area);
 595                 break;
 596         case 2: /* i/o resource accessibility */
 597                 chsc_process_sei_res_acc(sei_area);
 598                 break;
 599         case 3: /* ap config changed */
 600                 chsc_process_sei_ap_cfg_chg(sei_area);
 601                 break;
 602         case 7: /* channel-path-availability information */
 603                 chsc_process_sei_chp_avail(sei_area);
 604                 break;
 605         case 8: /* channel-path-configuration notification */
 606                 chsc_process_sei_chp_config(sei_area);
 607                 break;
 608         case 12: /* scm change notification */
 609                 chsc_process_sei_scm_change(sei_area);
 610                 break;
 611         case 14: /* scm available notification */
 612                 chsc_process_sei_scm_avail(sei_area);
 613                 break;
 614         default: /* other stuff */
 615                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 616                               sei_area->cc);
 617                 break;
 618         }
 619
 620         /* Check if we might have lost some information. */
 621         if (sei_area->flags & 0x40) {
 622                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 623                 css_schedule_eval_all();
 624         }
 625 }
 626
 627 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 628 {
 629         static int ntsm_unsupported;
 630
 631         while (true) {
 632                 memset(sei, 0, sizeof(*sei));
 633                 sei->request.length = 0x0010;
 634                 sei->request.code = 0x000e;
 635                 if (!ntsm_unsupported)
 636                         sei->ntsm = ntsm;
 637
 638                 if (chsc(sei))
 639                         break;
 640
 641                 if (sei->response.code != 0x0001) {
 642                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
 643                                       sei->response.code, sei->ntsm);
 644
 645                         if (sei->response.code == 3 && sei->ntsm) {
 646                                 /* Fallback for old firmware. */
 647                                 ntsm_unsupported = 1;
 648                                 continue;
 649                         }
 650                         break;
 651                 }
 652
 653                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 654                 switch (sei->nt) {
 655                 case 0:
 656                         chsc_process_sei_nt0(&sei->u.nt0_area);
 657                         break;
 658                 case 2:
 659                         chsc_process_sei_nt2(&sei->u.nt2_area);
 660                         break;
 661                 default:
 662                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 663                         break;
 664                 }
 665
 666                 if (!(sei->u.nt0_area.flags & 0x80))
 667                         break;
 668         }
 669 }
 670
 671 /*
 672  * Handle channel subsystem related CRWs.
 673  * Use store event information to find out what's going on.
 674  *
 675  * Note: Access to sei_page is serialized through machine check handler
 676  * thread, so no need for locking.
 677  */
 678 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 679 {
 680         struct chsc_sei *sei = sei_page;
 681
 682         if (overflow) {
 683                 css_schedule_eval_all();
 684                 return;
 685         }
 686         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 687                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 688                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 689                       crw0->erc, crw0->rsid);
 690
 691         CIO_TRACE_EVENT(2, "prcss");
 692         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 693 }
 694
 695 void chsc_chp_online(struct chp_id chpid)
 696 {
 697         struct channel_path *chp = chpid_to_chp(chpid);
 698         struct chp_link link;
 699         char dbf_txt[15];
 700
 701         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 702         CIO_TRACE_EVENT(2, dbf_txt);
 703
 704         if (chp_get_status(chpid) != 0) {
 705                 memset(&link, 0, sizeof(struct chp_link));
 706                 link.chpid = chpid;
 707                 /* Wait until previous actions have settled. */
 708                 css_wait_for_slow_path();
 709
 710                 mutex_lock(&chp->lock);
 711                 chp_update_desc(chp);
 712                 mutex_unlock(&chp->lock);
 713
 714                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 715                                            &link);
 716                 css_schedule_reprobe();
 717         }
 718 }
 719
 720 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 721                                          struct chp_id chpid, int on)
 722 {
 723         unsigned long flags;
 724         struct chp_link link;
 725
 726         memset(&link, 0, sizeof(struct chp_link));
 727         link.chpid = chpid;
 728         spin_lock_irqsave(sch->lock, flags);
 729         if (sch->driver && sch->driver->chp_event)
 730                 sch->driver->chp_event(sch, &link,
 731                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 732         spin_unlock_irqrestore(sch->lock, flags);
 733 }
 734
 735 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 736 {
 737         struct chp_id *chpid = data;
 738
 739         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 740         return 0;
 741 }
 742
 743 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 744 {
 745         struct chp_id *chpid = data;
 746
 747         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 748         return 0;
 749 }
 750
 751 /**
 752  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 753  * @chpid: channl-path ID
 754  * @on: non-zero for vary online, zero for vary offline
 755  */
 756 int chsc_chp_vary(struct chp_id chpid, int on)
 757 {
 758         struct channel_path *chp = chpid_to_chp(chpid);
 759
 760         /*
 761          * Redo PathVerification on the devices the chpid connects to
 762          */
 763         if (on) {
 764                 /* Try to update the channel path description. */
 765                 chp_update_desc(chp);
 766                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 767                                            NULL, &chpid);
 768                 css_schedule_reprobe();
 769         } else
 770                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 771                                            NULL, &chpid);
 772
 773         return 0;
 774 }
 775
 776 static void
 777 chsc_remove_cmg_attr(struct channel_subsystem *css)
 778 {
 779         int i;
 780
 781         for (i = 0; i <= __MAX_CHPID; i++) {
 782                 if (!css->chps[i])
 783                         continue;
 784                 chp_remove_cmg_attr(css->chps[i]);
 785         }
 786 }
 787
 788 static int
 789 chsc_add_cmg_attr(struct channel_subsystem *css)
 790 {
 791         int i, ret;
 792
 793         ret = 0;
 794         for (i = 0; i <= __MAX_CHPID; i++) {
 795                 if (!css->chps[i])
 796                         continue;
 797                 ret = chp_add_cmg_attr(css->chps[i]);
 798                 if (ret)
 799                         goto cleanup;
 800         }
 801         return ret;
 802 cleanup:
 803         for (--i; i >= 0; i--) {
 804                 if (!css->chps[i])
 805                         continue;
 806                 chp_remove_cmg_attr(css->chps[i]);
 807         }
 808         return ret;
 809 }
 810
 811 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 812 {
 813         struct {
 814                 struct chsc_header request;
 815                 u32 operation_code : 2;
 816                 u32 : 30;
 817                 u32 key : 4;
 818                 u32 : 28;
 819                 u32 zeroes1;
 820                 u32 cub_addr1;
 821                 u32 zeroes2;
 822                 u32 cub_addr2;
 823                 u32 reserved[13];
 824                 struct chsc_header response;
 825                 u32 status : 8;
 826                 u32 : 4;
 827                 u32 fmt : 4;
 828                 u32 : 16;
 829         } *secm_area;
 830         unsigned long flags;
 831         int ret, ccode;
 832
 833         spin_lock_irqsave(&chsc_page_lock, flags);
 834         memset(chsc_page, 0, PAGE_SIZE);
 835         secm_area = chsc_page;
 836         secm_area->request.length = 0x0050;
 837         secm_area->request.code = 0x0016;
 838
 839         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 840         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 841         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 842
 843         secm_area->operation_code = enable ? 0 : 1;
 844
 845         ccode = chsc(secm_area);
 846         if (ccode > 0) {
 847                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 848                 goto out;
 849         }
 850
 851         switch (secm_area->response.code) {
 852         case 0x0102:
 853         case 0x0103:
 854                 ret = -EINVAL;
 855                 break;
 856         default:
 857                 ret = chsc_error_from_response(secm_area->response.code);
 858         }
 859         if (ret != 0)
 860                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 861                               secm_area->response.code);
 862 out:
 863         spin_unlock_irqrestore(&chsc_page_lock, flags);
 864         return ret;
 865 }
 866
 867 int
 868 chsc_secm(struct channel_subsystem *css, int enable)
 869 {
 870         int ret;
 871
 872         if (enable && !css->cm_enabled) {
 873                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 874                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 875                 if (!css->cub_addr1 || !css->cub_addr2) {
 876                         free_page((unsigned long)css->cub_addr1);
 877                         free_page((unsigned long)css->cub_addr2);
 878                         return -ENOMEM;
 879                 }
 880         }
 881         ret = __chsc_do_secm(css, enable);
 882         if (!ret) {
 883                 css->cm_enabled = enable;
 884                 if (css->cm_enabled) {
 885                         ret = chsc_add_cmg_attr(css);
 886                         if (ret) {
 887                                 __chsc_do_secm(css, 0);
 888                                 css->cm_enabled = 0;
 889                         }
 890                 } else
 891                         chsc_remove_cmg_attr(css);
 892         }
 893         if (!css->cm_enabled) {
 894                 free_page((unsigned long)css->cub_addr1);
 895                 free_page((unsigned long)css->cub_addr2);
 896         }
 897         return ret;
 898 }
 899
 900 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 901                                      int c, int m, void *page)
 902 {
 903         struct chsc_scpd *scpd_area;
 904         int ccode, ret;
 905
 906         if ((rfmt == 1 || rfmt == 0) && c == 1 &&
 907             !css_general_characteristics.fcs)
 908                 return -EINVAL;
 909         if ((rfmt == 2) && !css_general_characteristics.cib)
 910                 return -EINVAL;
 911         if ((rfmt == 3) && !css_general_characteristics.util_str)
 912                 return -EINVAL;
 913
 914         memset(page, 0, PAGE_SIZE);
 915         scpd_area = page;
 916         scpd_area->request.length = 0x0010;
 917         scpd_area->request.code = 0x0002;
 918         scpd_area->cssid = chpid.cssid;
 919         scpd_area->first_chpid = chpid.id;
 920         scpd_area->last_chpid = chpid.id;
 921         scpd_area->m = m;
 922         scpd_area->c = c;
 923         scpd_area->fmt = fmt;
 924         scpd_area->rfmt = rfmt;
 925
 926         ccode = chsc(scpd_area);
 927         if (ccode > 0)
 928                 return (ccode == 3) ? -ENODEV : -EBUSY;
 929
 930         ret = chsc_error_from_response(scpd_area->response.code);
 931         if (ret)
 932                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 933                               scpd_area->response.code);
 934         return ret;
 935 }
 936 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 937
 938 #define chsc_det_chp_desc(FMT, c)                                       \
 939 int chsc_determine_fmt##FMT##_channel_path_desc(                        \
 940         struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc)   \
 941 {                                                                       \
 942         struct chsc_scpd *scpd_area;                                    \
 943         unsigned long flags;                                            \
 944         int ret;                                                        \
 945                                                                         \
 946         spin_lock_irqsave(&chsc_page_lock, flags);                      \
 947         scpd_area = chsc_page;                                          \
 948         ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0,     \
 949                                                scpd_area);              \
 950         if (ret)                                                        \
 951                 goto out;                                               \
 952                                                                         \
 953         memcpy(desc, scpd_area->data, sizeof(*desc));                   \
 954 out:                                                                    \
 955         spin_unlock_irqrestore(&chsc_page_lock, flags);                 \
 956         return ret;                                                     \
 957 }
 958
 959 chsc_det_chp_desc(0, 0)
 960 chsc_det_chp_desc(1, 1)
 961 chsc_det_chp_desc(3, 0)
 962
 963 static void
 964 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 965                           struct cmg_chars *chars)
 966 {
 967         int i, mask;
 968
 969         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 970                 mask = 0x80 >> (i + 3);
 971                 if (cmcv & mask)
 972                         chp->cmg_chars.values[i] = chars->values[i];
 973                 else
 974                         chp->cmg_chars.values[i] = 0;
 975         }
 976 }
 977
 978 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 979 {
 980         unsigned long flags;
 981         int ccode, ret;
 982
 983         struct {
 984                 struct chsc_header request;
 985                 u32 : 24;
 986                 u32 first_chpid : 8;
 987                 u32 : 24;
 988                 u32 last_chpid : 8;
 989                 u32 zeroes1;
 990                 struct chsc_header response;
 991                 u32 zeroes2;
 992                 u32 not_valid : 1;
 993                 u32 shared : 1;
 994                 u32 : 22;
 995                 u32 chpid : 8;
 996                 u32 cmcv : 5;
 997                 u32 : 11;
 998                 u32 cmgq : 8;
 999                 u32 cmg : 8;
1000                 u32 zeroes3;
1001                 u32 data[NR_MEASUREMENT_CHARS];
1002         } *scmc_area;
1003
1004         chp->shared = -1;
1005         chp->cmg = -1;
1006
1007         if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1008                 return -EINVAL;
1009
1010         spin_lock_irqsave(&chsc_page_lock, flags);
1011         memset(chsc_page, 0, PAGE_SIZE);
1012         scmc_area = chsc_page;
1013         scmc_area->request.length = 0x0010;
1014         scmc_area->request.code = 0x0022;
1015         scmc_area->first_chpid = chp->chpid.id;
1016         scmc_area->last_chpid = chp->chpid.id;
1017
1018         ccode = chsc(scmc_area);
1019         if (ccode > 0) {
1020                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1021                 goto out;
1022         }
1023
1024         ret = chsc_error_from_response(scmc_area->response.code);
1025         if (ret) {
1026                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1027                               scmc_area->response.code);
1028                 goto out;
1029         }
1030         if (scmc_area->not_valid)
1031                 goto out;
1032
1033         chp->cmg = scmc_area->cmg;
1034         chp->shared = scmc_area->shared;
1035         if (chp->cmg != 2 && chp->cmg != 3) {
1036                 /* No cmg-dependent data. */
1037                 goto out;
1038         }
1039         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1040                                   (struct cmg_chars *) &scmc_area->data);
1041 out:
1042         spin_unlock_irqrestore(&chsc_page_lock, flags);
1043         return ret;
1044 }
1045
1046 int __init chsc_init(void)
1047 {
1048         int ret;
1049
1050         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1051         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1052         if (!sei_page || !chsc_page) {
1053                 ret = -ENOMEM;
1054                 goto out_err;
1055         }
1056         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1057         if (ret)
1058                 goto out_err;
1059         return ret;
1060 out_err:
1061         free_page((unsigned long)chsc_page);
1062         free_page((unsigned long)sei_page);
1063         return ret;
1064 }
1065
1066 void __init chsc_init_cleanup(void)
1067 {
1068         crw_unregister_handler(CRW_RSC_CSS);
1069         free_page((unsigned long)chsc_page);
1070         free_page((unsigned long)sei_page);
1071 }
1072
1073 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1074 {
1075         int ret;
1076
1077         sda_area->request.length = 0x0400;
1078         sda_area->request.code = 0x0031;
1079         sda_area->operation_code = operation_code;
1080
1081         ret = chsc(sda_area);
1082         if (ret > 0) {
1083                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1084                 goto out;
1085         }
1086
1087         switch (sda_area->response.code) {
1088         case 0x0101:
1089                 ret = -EOPNOTSUPP;
1090                 break;
1091         default:
1092                 ret = chsc_error_from_response(sda_area->response.code);
1093         }
1094 out:
1095         return ret;
1096 }
1097
1098 int chsc_enable_facility(int operation_code)
1099 {
1100         struct chsc_sda_area *sda_area;
1101         unsigned long flags;
1102         int ret;
1103
1104         spin_lock_irqsave(&chsc_page_lock, flags);
1105         memset(chsc_page, 0, PAGE_SIZE);
1106         sda_area = chsc_page;
1107
1108         ret = __chsc_enable_facility(sda_area, operation_code);
1109         if (ret != 0)
1110                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1111                               operation_code, sda_area->response.code);
1112
1113         spin_unlock_irqrestore(&chsc_page_lock, flags);
1114         return ret;
1115 }
1116
1117 int __init chsc_get_cssid_iid(int idx, u8 *cssid, u8 *iid)
1118 {
1119         struct {
1120                 struct chsc_header request;
1121                 u8 atype;
1122                 u32 : 24;
1123                 u32 reserved1[6];
1124                 struct chsc_header response;
1125                 u32 reserved2[3];
1126                 struct {
1127                         u8 cssid;
1128                         u8 iid;
1129                         u32 : 16;
1130                 } list[0];
1131         } *sdcal_area;
1132         int ret;
1133
1134         spin_lock_irq(&chsc_page_lock);
1135         memset(chsc_page, 0, PAGE_SIZE);
1136         sdcal_area = chsc_page;
1137         sdcal_area->request.length = 0x0020;
1138         sdcal_area->request.code = 0x0034;
1139         sdcal_area->atype = 4;
1140
1141         ret = chsc(sdcal_area);
1142         if (ret) {
1143                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1144                 goto exit;
1145         }
1146
1147         ret = chsc_error_from_response(sdcal_area->response.code);
1148         if (ret) {
1149                 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
1150                               sdcal_area->response.code);
1151                 goto exit;
1152         }
1153
1154         if ((addr_t) &sdcal_area->list[idx] <
1155             (addr_t) &sdcal_area->response + sdcal_area->response.length) {
1156                 *cssid = sdcal_area->list[idx].cssid;
1157                 *iid = sdcal_area->list[idx].iid;
1158         }
1159         else
1160                 ret = -ENODEV;
1161 exit:
1162         spin_unlock_irq(&chsc_page_lock);
1163         return ret;
1164 }
1165
1166 struct css_general_char css_general_characteristics;
1167 struct css_chsc_char css_chsc_characteristics;
1168
1169 int __init
1170 chsc_determine_css_characteristics(void)
1171 {
1172         unsigned long flags;
1173         int result;
1174         struct {
1175                 struct chsc_header request;
1176                 u32 reserved1;
1177                 u32 reserved2;
1178                 u32 reserved3;
1179                 struct chsc_header response;
1180                 u32 reserved4;
1181                 u32 general_char[510];
1182                 u32 chsc_char[508];
1183         } *scsc_area;
1184
1185         spin_lock_irqsave(&chsc_page_lock, flags);
1186         memset(chsc_page, 0, PAGE_SIZE);
1187         scsc_area = chsc_page;
1188         scsc_area->request.length = 0x0010;
1189         scsc_area->request.code = 0x0010;
1190
1191         result = chsc(scsc_area);
1192         if (result) {
1193                 result = (result == 3) ? -ENODEV : -EBUSY;
1194                 goto exit;
1195         }
1196
1197         result = chsc_error_from_response(scsc_area->response.code);
1198         if (result == 0) {
1199                 memcpy(&css_general_characteristics, scsc_area->general_char,
1200                        sizeof(css_general_characteristics));
1201                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1202                        sizeof(css_chsc_characteristics));
1203         } else
1204                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1205                               scsc_area->response.code);
1206 exit:
1207         spin_unlock_irqrestore(&chsc_page_lock, flags);
1208         return result;
1209 }
1210
1211 EXPORT_SYMBOL_GPL(css_general_characteristics);
1212 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1213
1214 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta)
1215 {
1216         struct {
1217                 struct chsc_header request;
1218                 unsigned int rsvd0;
1219                 unsigned int op : 8;
1220                 unsigned int rsvd1 : 8;
1221                 unsigned int ctrl : 16;
1222                 unsigned int rsvd2[5];
1223                 struct chsc_header response;
1224                 unsigned int rsvd3[3];
1225                 u64 clock_delta;
1226                 unsigned int rsvd4[2];
1227         } *rr;
1228         int rc;
1229
1230         memset(page, 0, PAGE_SIZE);
1231         rr = page;
1232         rr->request.length = 0x0020;
1233         rr->request.code = 0x0033;
1234         rr->op = op;
1235         rr->ctrl = ctrl;
1236         rc = chsc(rr);
1237         if (rc)
1238                 return -EIO;
1239         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1240         if (clock_delta)
1241                 *clock_delta = rr->clock_delta;
1242         return rc;
1243 }
1244
1245 int chsc_sstpi(void *page, void *result, size_t size)
1246 {
1247         struct {
1248                 struct chsc_header request;
1249                 unsigned int rsvd0[3];
1250                 struct chsc_header response;
1251                 char data[];
1252         } *rr;
1253         int rc;
1254
1255         memset(page, 0, PAGE_SIZE);
1256         rr = page;
1257         rr->request.length = 0x0010;
1258         rr->request.code = 0x0038;
1259         rc = chsc(rr);
1260         if (rc)
1261                 return -EIO;
1262         memcpy(result, &rr->data, size);
1263         return (rr->response.code == 0x0001) ? 0 : -EIO;
1264 }
1265
1266 int chsc_stzi(void *page, void *result, size_t size)
1267 {
1268         struct {
1269                 struct chsc_header request;
1270                 unsigned int rsvd0[3];
1271                 struct chsc_header response;
1272                 char data[];
1273         } *rr;
1274         int rc;
1275
1276         memset(page, 0, PAGE_SIZE);
1277         rr = page;
1278         rr->request.length = 0x0010;
1279         rr->request.code = 0x003e;
1280         rc = chsc(rr);
1281         if (rc)
1282                 return -EIO;
1283         memcpy(result, &rr->data, size);
1284         return (rr->response.code == 0x0001) ? 0 : -EIO;
1285 }
1286
1287 int chsc_siosl(struct subchannel_id schid)
1288 {
1289         struct {
1290                 struct chsc_header request;
1291                 u32 word1;
1292                 struct subchannel_id sid;
1293                 u32 word3;
1294                 struct chsc_header response;
1295                 u32 word[11];
1296         } *siosl_area;
1297         unsigned long flags;
1298         int ccode;
1299         int rc;
1300
1301         spin_lock_irqsave(&chsc_page_lock, flags);
1302         memset(chsc_page, 0, PAGE_SIZE);
1303         siosl_area = chsc_page;
1304         siosl_area->request.length = 0x0010;
1305         siosl_area->request.code = 0x0046;
1306         siosl_area->word1 = 0x80000000;
1307         siosl_area->sid = schid;
1308
1309         ccode = chsc(siosl_area);
1310         if (ccode > 0) {
1311                 if (ccode == 3)
1312                         rc = -ENODEV;
1313                 else
1314                         rc = -EBUSY;
1315                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1316                               schid.ssid, schid.sch_no, ccode);
1317                 goto out;
1318         }
1319         rc = chsc_error_from_response(siosl_area->response.code);
1320         if (rc)
1321                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1322                               schid.ssid, schid.sch_no,
1323                               siosl_area->response.code);
1324         else
1325                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1326                               schid.ssid, schid.sch_no);
1327 out:
1328         spin_unlock_irqrestore(&chsc_page_lock, flags);
1329         return rc;
1330 }
1331 EXPORT_SYMBOL_GPL(chsc_siosl);
1332
1333 /**
1334  * chsc_scm_info() - store SCM information (SSI)
1335  * @scm_area: request and response block for SSI
1336  * @token: continuation token
1337  *
1338  * Returns 0 on success.
1339  */
1340 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1341 {
1342         int ccode, ret;
1343
1344         memset(scm_area, 0, sizeof(*scm_area));
1345         scm_area->request.length = 0x0020;
1346         scm_area->request.code = 0x004C;
1347         scm_area->reqtok = token;
1348
1349         ccode = chsc(scm_area);
1350         if (ccode > 0) {
1351                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1352                 goto out;
1353         }
1354         ret = chsc_error_from_response(scm_area->response.code);
1355         if (ret != 0)
1356                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1357                               scm_area->response.code);
1358 out:
1359         return ret;
1360 }
1361 EXPORT_SYMBOL_GPL(chsc_scm_info);
1362
1363 /**
1364  * chsc_pnso() - Perform Network-Subchannel Operation
1365  * @schid:              id of the subchannel on which PNSO is performed
1366  * @pnso_area:          request and response block for the operation
1367  * @oc:                 Operation Code
1368  * @resume_token:       resume token for multiblock response
1369  * @cnc:                Boolean change-notification control
1370  *
1371  * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1372  *
1373  * Returns 0 on success.
1374  */
1375 int chsc_pnso(struct subchannel_id schid, struct chsc_pnso_area *pnso_area,
1376               u8 oc, struct chsc_pnso_resume_token resume_token, int cnc)
1377 {
1378         memset(pnso_area, 0, sizeof(*pnso_area));
1379         pnso_area->request.length = 0x0030;
1380         pnso_area->request.code = 0x003d; /* network-subchannel operation */
1381         pnso_area->m       = schid.m;
1382         pnso_area->ssid  = schid.ssid;
1383         pnso_area->sch   = schid.sch_no;
1384         pnso_area->cssid = schid.cssid;
1385         pnso_area->oc    = oc;
1386         pnso_area->resume_token = resume_token;
1387         pnso_area->n       = (cnc != 0);
1388         if (chsc(pnso_area))
1389                 return -EIO;
1390         return chsc_error_from_response(pnso_area->response.code);
1391 }
1392
1393 int chsc_sgib(u32 origin)
1394 {
1395         struct {
1396                 struct chsc_header request;
1397                 u16 op;
1398                 u8  reserved01[2];
1399                 u8  reserved02:4;
1400                 u8  fmt:4;
1401                 u8  reserved03[7];
1402                 /* operation data area begin */
1403                 u8  reserved04[4];
1404                 u32 gib_origin;
1405                 u8  reserved05[10];
1406                 u8  aix;
1407                 u8  reserved06[4029];
1408                 struct chsc_header response;
1409                 u8  reserved07[4];
1410         } *sgib_area;
1411         int ret;
1412
1413         spin_lock_irq(&chsc_page_lock);
1414         memset(chsc_page, 0, PAGE_SIZE);
1415         sgib_area = chsc_page;
1416         sgib_area->request.length = 0x0fe0;
1417         sgib_area->request.code = 0x0021;
1418         sgib_area->op = 0x1;
1419         sgib_area->gib_origin = origin;
1420
1421         ret = chsc(sgib_area);
1422         if (ret == 0)
1423                 ret = chsc_error_from_response(sgib_area->response.code);
1424         spin_unlock_irq(&chsc_page_lock);
1425
1426         return ret;
1427 }
1428 EXPORT_SYMBOL_GPL(chsc_sgib);