drivers/s390/cio/chsc.c

   1 /*
   2  *   S/390 common I/O routines -- channel subsystem call
   3  *
   4  *    Copyright IBM Corp. 1999,2012
   5  *    Author(s): Ingo Adlung (adlung@de.ibm.com)
   6  *               Cornelia Huck (cornelia.huck@de.ibm.com)
   7  *               Arnd Bergmann (arndb@de.ibm.com)
   8  */
   9
  10 #define KMSG_COMPONENT "cio"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/init.h>
  16 #include <linux/device.h>
  17 #include <linux/mutex.h>
  18 #include <linux/pci.h>
  19
  20 #include <asm/cio.h>
  21 #include <asm/chpid.h>
  22 #include <asm/chsc.h>
  23 #include <asm/crw.h>
  24 #include <asm/isc.h>
  25 #include <asm/ebcdic.h>
  26
  27 #include "css.h"
  28 #include "cio.h"
  29 #include "cio_debug.h"
  30 #include "ioasm.h"
  31 #include "chp.h"
  32 #include "chsc.h"
  33
  34 static void *sei_page;
  35 static void *chsc_page;
  36 static DEFINE_SPINLOCK(chsc_page_lock);
  37
  38 /**
  39  * chsc_error_from_response() - convert a chsc response to an error
  40  * @response: chsc response code
  41  *
  42  * Returns an appropriate Linux error code for @response.
  43  */
  44 int chsc_error_from_response(int response)
  45 {
  46         switch (response) {
  47         case 0x0001:
  48                 return 0;
  49         case 0x0002:
  50         case 0x0003:
  51         case 0x0006:
  52         case 0x0007:
  53         case 0x0008:
  54         case 0x000a:
  55         case 0x0104:
  56                 return -EINVAL;
  57         case 0x0004:
  58                 return -EOPNOTSUPP;
  59         case 0x000b:
  60         case 0x0107:            /* "Channel busy" for the op 0x003d */
  61                 return -EBUSY;
  62         case 0x0100:
  63         case 0x0102:
  64                 return -ENOMEM;
  65         default:
  66                 return -EIO;
  67         }
  68 }
  69 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  70
  71 struct chsc_ssd_area {
  72         struct chsc_header request;
  73         u16 :10;
  74         u16 ssid:2;
  75         u16 :4;
  76         u16 f_sch;        /* first subchannel */
  77         u16 :16;
  78         u16 l_sch;        /* last subchannel */
  79         u32 :32;
  80         struct chsc_header response;
  81         u32 :32;
  82         u8 sch_valid : 1;
  83         u8 dev_valid : 1;
  84         u8 st        : 3; /* subchannel type */
  85         u8 zeroes    : 3;
  86         u8  unit_addr;    /* unit address */
  87         u16 devno;        /* device number */
  88         u8 path_mask;
  89         u8 fla_valid_mask;
  90         u16 sch;          /* subchannel */
  91         u8 chpid[8];      /* chpids 0-7 */
  92         u16 fla[8];       /* full link addresses 0-7 */
  93 } __attribute__ ((packed));
  94
  95 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  96 {
  97         struct chsc_ssd_area *ssd_area;
  98         int ccode;
  99         int ret;
 100         int i;
 101         int mask;
 102
 103         spin_lock_irq(&chsc_page_lock);
 104         memset(chsc_page, 0, PAGE_SIZE);
 105         ssd_area = chsc_page;
 106         ssd_area->request.length = 0x0010;
 107         ssd_area->request.code = 0x0004;
 108         ssd_area->ssid = schid.ssid;
 109         ssd_area->f_sch = schid.sch_no;
 110         ssd_area->l_sch = schid.sch_no;
 111
 112         ccode = chsc(ssd_area);
 113         /* Check response. */
 114         if (ccode > 0) {
 115                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 116                 goto out;
 117         }
 118         ret = chsc_error_from_response(ssd_area->response.code);
 119         if (ret != 0) {
 120                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 121                               schid.ssid, schid.sch_no,
 122                               ssd_area->response.code);
 123                 goto out;
 124         }
 125         if (!ssd_area->sch_valid) {
 126                 ret = -ENODEV;
 127                 goto out;
 128         }
 129         /* Copy data */
 130         ret = 0;
 131         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 132         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 133             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 134                 goto out;
 135         ssd->path_mask = ssd_area->path_mask;
 136         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 137         for (i = 0; i < 8; i++) {
 138                 mask = 0x80 >> i;
 139                 if (ssd_area->path_mask & mask) {
 140                         chp_id_init(&ssd->chpid[i]);
 141                         ssd->chpid[i].id = ssd_area->chpid[i];
 142                 }
 143                 if (ssd_area->fla_valid_mask & mask)
 144                         ssd->fla[i] = ssd_area->fla[i];
 145         }
 146 out:
 147         spin_unlock_irq(&chsc_page_lock);
 148         return ret;
 149 }
 150
 151 /**
 152  * chsc_ssqd() - store subchannel QDIO data (SSQD)
 153  * @schid: id of the subchannel on which SSQD is performed
 154  * @ssqd: request and response block for SSQD
 155  *
 156  * Returns 0 on success.
 157  */
 158 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 159 {
 160         memset(ssqd, 0, sizeof(*ssqd));
 161         ssqd->request.length = 0x0010;
 162         ssqd->request.code = 0x0024;
 163         ssqd->first_sch = schid.sch_no;
 164         ssqd->last_sch = schid.sch_no;
 165         ssqd->ssid = schid.ssid;
 166
 167         if (chsc(ssqd))
 168                 return -EIO;
 169
 170         return chsc_error_from_response(ssqd->response.code);
 171 }
 172 EXPORT_SYMBOL_GPL(chsc_ssqd);
 173
 174 /**
 175  * chsc_sadc() - set adapter device controls (SADC)
 176  * @schid: id of the subchannel on which SADC is performed
 177  * @scssc: request and response block for SADC
 178  * @summary_indicator_addr: summary indicator address
 179  * @subchannel_indicator_addr: subchannel indicator address
 180  *
 181  * Returns 0 on success.
 182  */
 183 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
 184               u64 summary_indicator_addr, u64 subchannel_indicator_addr)
 185 {
 186         memset(scssc, 0, sizeof(*scssc));
 187         scssc->request.length = 0x0fe0;
 188         scssc->request.code = 0x0021;
 189         scssc->operation_code = 0;
 190
 191         scssc->summary_indicator_addr = summary_indicator_addr;
 192         scssc->subchannel_indicator_addr = subchannel_indicator_addr;
 193
 194         scssc->ks = PAGE_DEFAULT_KEY >> 4;
 195         scssc->kc = PAGE_DEFAULT_KEY >> 4;
 196         scssc->isc = QDIO_AIRQ_ISC;
 197         scssc->schid = schid;
 198
 199         /* enable the time delay disablement facility */
 200         if (css_general_characteristics.aif_tdd)
 201                 scssc->word_with_d_bit = 0x10000000;
 202
 203         if (chsc(scssc))
 204                 return -EIO;
 205
 206         return chsc_error_from_response(scssc->response.code);
 207 }
 208 EXPORT_SYMBOL_GPL(chsc_sadc);
 209
 210 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 211 {
 212         spin_lock_irq(sch->lock);
 213         if (sch->driver && sch->driver->chp_event)
 214                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 215                         goto out_unreg;
 216         spin_unlock_irq(sch->lock);
 217         return 0;
 218
 219 out_unreg:
 220         sch->lpm = 0;
 221         spin_unlock_irq(sch->lock);
 222         css_schedule_eval(sch->schid);
 223         return 0;
 224 }
 225
 226 void chsc_chp_offline(struct chp_id chpid)
 227 {
 228         struct channel_path *chp = chpid_to_chp(chpid);
 229         struct chp_link link;
 230         char dbf_txt[15];
 231
 232         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 233         CIO_TRACE_EVENT(2, dbf_txt);
 234
 235         if (chp_get_status(chpid) <= 0)
 236                 return;
 237         memset(&link, 0, sizeof(struct chp_link));
 238         link.chpid = chpid;
 239         /* Wait until previous actions have settled. */
 240         css_wait_for_slow_path();
 241
 242         mutex_lock(&chp->lock);
 243         chp_update_desc(chp);
 244         mutex_unlock(&chp->lock);
 245
 246         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 247 }
 248
 249 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 250 {
 251         spin_lock_irq(sch->lock);
 252         if (sch->driver && sch->driver->chp_event)
 253                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 254         spin_unlock_irq(sch->lock);
 255
 256         return 0;
 257 }
 258
 259 static void s390_process_res_acc(struct chp_link *link)
 260 {
 261         char dbf_txt[15];
 262
 263         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 264                 link->chpid.id);
 265         CIO_TRACE_EVENT( 2, dbf_txt);
 266         if (link->fla != 0) {
 267                 sprintf(dbf_txt, "fla%x", link->fla);
 268                 CIO_TRACE_EVENT( 2, dbf_txt);
 269         }
 270         /* Wait until previous actions have settled. */
 271         css_wait_for_slow_path();
 272         /*
 273          * I/O resources may have become accessible.
 274          * Scan through all subchannels that may be concerned and
 275          * do a validation on those.
 276          * The more information we have (info), the less scanning
 277          * will we have to do.
 278          */
 279         for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
 280         css_schedule_reprobe();
 281 }
 282
 283 struct chsc_sei_nt0_area {
 284         u8  flags;
 285         u8  vf;                         /* validity flags */
 286         u8  rs;                         /* reporting source */
 287         u8  cc;                         /* content code */
 288         u16 fla;                        /* full link address */
 289         u16 rsid;                       /* reporting source id */
 290         u32 reserved1;
 291         u32 reserved2;
 292         /* ccdf has to be big enough for a link-incident record */
 293         u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 294 } __packed;
 295
 296 struct chsc_sei_nt2_area {
 297         u8  flags;                      /* p and v bit */
 298         u8  reserved1;
 299         u8  reserved2;
 300         u8  cc;                         /* content code */
 301         u32 reserved3[13];
 302         u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 303 } __packed;
 304
 305 #define CHSC_SEI_NT0    (1ULL << 63)
 306 #define CHSC_SEI_NT2    (1ULL << 61)
 307
 308 struct chsc_sei {
 309         struct chsc_header request;
 310         u32 reserved1;
 311         u64 ntsm;                       /* notification type mask */
 312         struct chsc_header response;
 313         u32 :24;
 314         u8 nt;
 315         union {
 316                 struct chsc_sei_nt0_area nt0_area;
 317                 struct chsc_sei_nt2_area nt2_area;
 318                 u8 nt_area[PAGE_SIZE - 24];
 319         } u;
 320 } __packed;
 321
 322 /*
 323  * Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands"
 324  */
 325
 326 #define ND_VALIDITY_VALID       0
 327 #define ND_VALIDITY_OUTDATED    1
 328 #define ND_VALIDITY_INVALID     2
 329
 330 struct node_descriptor {
 331         /* Flags. */
 332         union {
 333                 struct {
 334                         u32 validity:3;
 335                         u32 reserved:5;
 336                 } __packed;
 337                 u8 byte0;
 338         } __packed;
 339
 340         /* Node parameters. */
 341         u32 params:24;
 342
 343         /* Node ID. */
 344         char type[6];
 345         char model[3];
 346         char manufacturer[3];
 347         char plant[2];
 348         char seq[12];
 349         u16 tag;
 350 } __packed;
 351
 352 /*
 353  * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
 354  */
 355
 356 #define LIR_IQ_CLASS_INFO               0
 357 #define LIR_IQ_CLASS_DEGRADED           1
 358 #define LIR_IQ_CLASS_NOT_OPERATIONAL    2
 359
 360 struct lir {
 361         struct {
 362                 u32 null:1;
 363                 u32 reserved:3;
 364                 u32 class:2;
 365                 u32 reserved2:2;
 366         } __packed iq;
 367         u32 ic:8;
 368         u32 reserved:16;
 369         struct node_descriptor incident_node;
 370         struct node_descriptor attached_node;
 371         u8 reserved2[32];
 372 } __packed;
 373
 374 #define PARAMS_LEN      10      /* PARAMS=xx,xxxxxx */
 375 #define NODEID_LEN      35      /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 376
 377 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
 378 static char *store_ebcdic(char *dest, const char *src, unsigned long len,
 379                           char delim)
 380 {
 381         memcpy(dest, src, len);
 382         EBCASC(dest, len);
 383
 384         if (delim)
 385                 dest[len++] = delim;
 386
 387         return dest + len;
 388 }
 389
 390 /* Format node ID and parameters for output in LIR log message. */
 391 static void format_node_data(char *params, char *id, struct node_descriptor *nd)
 392 {
 393         memset(params, 0, PARAMS_LEN);
 394         memset(id, 0, NODEID_LEN);
 395
 396         if (nd->validity != ND_VALIDITY_VALID) {
 397                 strncpy(params, "n/a", PARAMS_LEN - 1);
 398                 strncpy(id, "n/a", NODEID_LEN - 1);
 399                 return;
 400         }
 401
 402         /* PARAMS=xx,xxxxxx */
 403         snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
 404         /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 405         id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
 406         id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
 407         id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
 408         id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
 409         id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
 410         sprintf(id, "%04X", nd->tag);
 411 }
 412
 413 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 414 {
 415         struct lir *lir = (struct lir *) &sei_area->ccdf;
 416         char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
 417              aunodeid[NODEID_LEN];
 418
 419         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
 420                       sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
 421
 422         /* Ignore NULL Link Incident Records. */
 423         if (lir->iq.null)
 424                 return;
 425
 426         /* Inform user that a link requires maintenance actions because it has
 427          * become degraded or not operational. Note that this log message is
 428          * the primary intention behind a Link Incident Record. */
 429
 430         format_node_data(iuparams, iunodeid, &lir->incident_node);
 431         format_node_data(auparams, aunodeid, &lir->attached_node);
 432
 433         switch (lir->iq.class) {
 434         case LIR_IQ_CLASS_DEGRADED:
 435                 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
 436                         "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 437                         sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 438                         iunodeid, auparams, aunodeid);
 439                 break;
 440         case LIR_IQ_CLASS_NOT_OPERATIONAL:
 441                 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
 442                        "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 443                        sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 444                        iunodeid, auparams, aunodeid);
 445                 break;
 446         default:
 447                 break;
 448         }
 449 }
 450
 451 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 452 {
 453         struct chp_link link;
 454         struct chp_id chpid;
 455         int status;
 456
 457         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 458                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 459         if (sei_area->rs != 4)
 460                 return;
 461         chp_id_init(&chpid);
 462         chpid.id = sei_area->rsid;
 463         /* allocate a new channel path structure, if needed */
 464         status = chp_get_status(chpid);
 465         if (status < 0)
 466                 chp_new(chpid);
 467         else if (!status)
 468                 return;
 469         memset(&link, 0, sizeof(struct chp_link));
 470         link.chpid = chpid;
 471         if ((sei_area->vf & 0xc0) != 0) {
 472                 link.fla = sei_area->fla;
 473                 if ((sei_area->vf & 0xc0) == 0xc0)
 474                         /* full link address */
 475                         link.fla_mask = 0xffff;
 476                 else
 477                         /* link address */
 478                         link.fla_mask = 0xff00;
 479         }
 480         s390_process_res_acc(&link);
 481 }
 482
 483 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 484 {
 485         struct channel_path *chp;
 486         struct chp_id chpid;
 487         u8 *data;
 488         int num;
 489
 490         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 491         if (sei_area->rs != 0)
 492                 return;
 493         data = sei_area->ccdf;
 494         chp_id_init(&chpid);
 495         for (num = 0; num <= __MAX_CHPID; num++) {
 496                 if (!chp_test_bit(data, num))
 497                         continue;
 498                 chpid.id = num;
 499
 500                 CIO_CRW_EVENT(4, "Update information for channel path "
 501                               "%x.%02x\n", chpid.cssid, chpid.id);
 502                 chp = chpid_to_chp(chpid);
 503                 if (!chp) {
 504                         chp_new(chpid);
 505                         continue;
 506                 }
 507                 mutex_lock(&chp->lock);
 508                 chp_update_desc(chp);
 509                 mutex_unlock(&chp->lock);
 510         }
 511 }
 512
 513 struct chp_config_data {
 514         u8 map[32];
 515         u8 op;
 516         u8 pc;
 517 };
 518
 519 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 520 {
 521         struct chp_config_data *data;
 522         struct chp_id chpid;
 523         int num;
 524         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 525
 526         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 527         if (sei_area->rs != 0)
 528                 return;
 529         data = (struct chp_config_data *) &(sei_area->ccdf);
 530         chp_id_init(&chpid);
 531         for (num = 0; num <= __MAX_CHPID; num++) {
 532                 if (!chp_test_bit(data->map, num))
 533                         continue;
 534                 chpid.id = num;
 535                 pr_notice("Processing %s for channel path %x.%02x\n",
 536                           events[data->op], chpid.cssid, chpid.id);
 537                 switch (data->op) {
 538                 case 0:
 539                         chp_cfg_schedule(chpid, 1);
 540                         break;
 541                 case 1:
 542                         chp_cfg_schedule(chpid, 0);
 543                         break;
 544                 case 2:
 545                         chp_cfg_cancel_deconfigure(chpid);
 546                         break;
 547                 }
 548         }
 549 }
 550
 551 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 552 {
 553         int ret;
 554
 555         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 556         if (sei_area->rs != 7)
 557                 return;
 558
 559         ret = scm_update_information();
 560         if (ret)
 561                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 562                               " failed (rc=%d).\n", ret);
 563 }
 564
 565 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 566 {
 567         int ret;
 568
 569         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 570         if (sei_area->rs != 7)
 571                 return;
 572
 573         ret = scm_process_availability_information();
 574         if (ret)
 575                 CIO_CRW_EVENT(0, "chsc: process availability information"
 576                               " failed (rc=%d).\n", ret);
 577 }
 578
 579 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 580 {
 581         switch (sei_area->cc) {
 582         case 1:
 583                 zpci_event_error(sei_area->ccdf);
 584                 break;
 585         case 2:
 586                 zpci_event_availability(sei_area->ccdf);
 587                 break;
 588         default:
 589                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 590                               sei_area->cc);
 591                 break;
 592         }
 593 }
 594
 595 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 596 {
 597         /* which kind of information was stored? */
 598         switch (sei_area->cc) {
 599         case 1: /* link incident*/
 600                 chsc_process_sei_link_incident(sei_area);
 601                 break;
 602         case 2: /* i/o resource accessibility */
 603                 chsc_process_sei_res_acc(sei_area);
 604                 break;
 605         case 7: /* channel-path-availability information */
 606                 chsc_process_sei_chp_avail(sei_area);
 607                 break;
 608         case 8: /* channel-path-configuration notification */
 609                 chsc_process_sei_chp_config(sei_area);
 610                 break;
 611         case 12: /* scm change notification */
 612                 chsc_process_sei_scm_change(sei_area);
 613                 break;
 614         case 14: /* scm available notification */
 615                 chsc_process_sei_scm_avail(sei_area);
 616                 break;
 617         default: /* other stuff */
 618                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 619                               sei_area->cc);
 620                 break;
 621         }
 622
 623         /* Check if we might have lost some information. */
 624         if (sei_area->flags & 0x40) {
 625                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 626                 css_schedule_eval_all();
 627         }
 628 }
 629
 630 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 631 {
 632         static int ntsm_unsupported;
 633
 634         while (true) {
 635                 memset(sei, 0, sizeof(*sei));
 636                 sei->request.length = 0x0010;
 637                 sei->request.code = 0x000e;
 638                 if (!ntsm_unsupported)
 639                         sei->ntsm = ntsm;
 640
 641                 if (chsc(sei))
 642                         break;
 643
 644                 if (sei->response.code != 0x0001) {
 645                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
 646                                       sei->response.code, sei->ntsm);
 647
 648                         if (sei->response.code == 3 && sei->ntsm) {
 649                                 /* Fallback for old firmware. */
 650                                 ntsm_unsupported = 1;
 651                                 continue;
 652                         }
 653                         break;
 654                 }
 655
 656                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 657                 switch (sei->nt) {
 658                 case 0:
 659                         chsc_process_sei_nt0(&sei->u.nt0_area);
 660                         break;
 661                 case 2:
 662                         chsc_process_sei_nt2(&sei->u.nt2_area);
 663                         break;
 664                 default:
 665                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 666                         break;
 667                 }
 668
 669                 if (!(sei->u.nt0_area.flags & 0x80))
 670                         break;
 671         }
 672 }
 673
 674 /*
 675  * Handle channel subsystem related CRWs.
 676  * Use store event information to find out what's going on.
 677  *
 678  * Note: Access to sei_page is serialized through machine check handler
 679  * thread, so no need for locking.
 680  */
 681 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 682 {
 683         struct chsc_sei *sei = sei_page;
 684
 685         if (overflow) {
 686                 css_schedule_eval_all();
 687                 return;
 688         }
 689         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 690                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 691                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 692                       crw0->erc, crw0->rsid);
 693
 694         CIO_TRACE_EVENT(2, "prcss");
 695         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 696 }
 697
 698 void chsc_chp_online(struct chp_id chpid)
 699 {
 700         struct channel_path *chp = chpid_to_chp(chpid);
 701         struct chp_link link;
 702         char dbf_txt[15];
 703
 704         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 705         CIO_TRACE_EVENT(2, dbf_txt);
 706
 707         if (chp_get_status(chpid) != 0) {
 708                 memset(&link, 0, sizeof(struct chp_link));
 709                 link.chpid = chpid;
 710                 /* Wait until previous actions have settled. */
 711                 css_wait_for_slow_path();
 712
 713                 mutex_lock(&chp->lock);
 714                 chp_update_desc(chp);
 715                 mutex_unlock(&chp->lock);
 716
 717                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 718                                            &link);
 719                 css_schedule_reprobe();
 720         }
 721 }
 722
 723 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 724                                          struct chp_id chpid, int on)
 725 {
 726         unsigned long flags;
 727         struct chp_link link;
 728
 729         memset(&link, 0, sizeof(struct chp_link));
 730         link.chpid = chpid;
 731         spin_lock_irqsave(sch->lock, flags);
 732         if (sch->driver && sch->driver->chp_event)
 733                 sch->driver->chp_event(sch, &link,
 734                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 735         spin_unlock_irqrestore(sch->lock, flags);
 736 }
 737
 738 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 739 {
 740         struct chp_id *chpid = data;
 741
 742         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 743         return 0;
 744 }
 745
 746 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 747 {
 748         struct chp_id *chpid = data;
 749
 750         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 751         return 0;
 752 }
 753
 754 /**
 755  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 756  * @chpid: channl-path ID
 757  * @on: non-zero for vary online, zero for vary offline
 758  */
 759 int chsc_chp_vary(struct chp_id chpid, int on)
 760 {
 761         struct channel_path *chp = chpid_to_chp(chpid);
 762
 763         /* Wait until previous actions have settled. */
 764         css_wait_for_slow_path();
 765         /*
 766          * Redo PathVerification on the devices the chpid connects to
 767          */
 768         if (on) {
 769                 /* Try to update the channel path description. */
 770                 chp_update_desc(chp);
 771                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 772                                            NULL, &chpid);
 773                 css_schedule_reprobe();
 774         } else
 775                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 776                                            NULL, &chpid);
 777
 778         return 0;
 779 }
 780
 781 static void
 782 chsc_remove_cmg_attr(struct channel_subsystem *css)
 783 {
 784         int i;
 785
 786         for (i = 0; i <= __MAX_CHPID; i++) {
 787                 if (!css->chps[i])
 788                         continue;
 789                 chp_remove_cmg_attr(css->chps[i]);
 790         }
 791 }
 792
 793 static int
 794 chsc_add_cmg_attr(struct channel_subsystem *css)
 795 {
 796         int i, ret;
 797
 798         ret = 0;
 799         for (i = 0; i <= __MAX_CHPID; i++) {
 800                 if (!css->chps[i])
 801                         continue;
 802                 ret = chp_add_cmg_attr(css->chps[i]);
 803                 if (ret)
 804                         goto cleanup;
 805         }
 806         return ret;
 807 cleanup:
 808         for (--i; i >= 0; i--) {
 809                 if (!css->chps[i])
 810                         continue;
 811                 chp_remove_cmg_attr(css->chps[i]);
 812         }
 813         return ret;
 814 }
 815
 816 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 817 {
 818         struct {
 819                 struct chsc_header request;
 820                 u32 operation_code : 2;
 821                 u32 : 30;
 822                 u32 key : 4;
 823                 u32 : 28;
 824                 u32 zeroes1;
 825                 u32 cub_addr1;
 826                 u32 zeroes2;
 827                 u32 cub_addr2;
 828                 u32 reserved[13];
 829                 struct chsc_header response;
 830                 u32 status : 8;
 831                 u32 : 4;
 832                 u32 fmt : 4;
 833                 u32 : 16;
 834         } __attribute__ ((packed)) *secm_area;
 835         int ret, ccode;
 836
 837         spin_lock_irq(&chsc_page_lock);
 838         memset(chsc_page, 0, PAGE_SIZE);
 839         secm_area = chsc_page;
 840         secm_area->request.length = 0x0050;
 841         secm_area->request.code = 0x0016;
 842
 843         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 844         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 845         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 846
 847         secm_area->operation_code = enable ? 0 : 1;
 848
 849         ccode = chsc(secm_area);
 850         if (ccode > 0) {
 851                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 852                 goto out;
 853         }
 854
 855         switch (secm_area->response.code) {
 856         case 0x0102:
 857         case 0x0103:
 858                 ret = -EINVAL;
 859                 break;
 860         default:
 861                 ret = chsc_error_from_response(secm_area->response.code);
 862         }
 863         if (ret != 0)
 864                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 865                               secm_area->response.code);
 866 out:
 867         spin_unlock_irq(&chsc_page_lock);
 868         return ret;
 869 }
 870
 871 int
 872 chsc_secm(struct channel_subsystem *css, int enable)
 873 {
 874         int ret;
 875
 876         if (enable && !css->cm_enabled) {
 877                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 878                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 879                 if (!css->cub_addr1 || !css->cub_addr2) {
 880                         free_page((unsigned long)css->cub_addr1);
 881                         free_page((unsigned long)css->cub_addr2);
 882                         return -ENOMEM;
 883                 }
 884         }
 885         ret = __chsc_do_secm(css, enable);
 886         if (!ret) {
 887                 css->cm_enabled = enable;
 888                 if (css->cm_enabled) {
 889                         ret = chsc_add_cmg_attr(css);
 890                         if (ret) {
 891                                 __chsc_do_secm(css, 0);
 892                                 css->cm_enabled = 0;
 893                         }
 894                 } else
 895                         chsc_remove_cmg_attr(css);
 896         }
 897         if (!css->cm_enabled) {
 898                 free_page((unsigned long)css->cub_addr1);
 899                 free_page((unsigned long)css->cub_addr2);
 900         }
 901         return ret;
 902 }
 903
 904 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 905                                      int c, int m, void *page)
 906 {
 907         struct chsc_scpd *scpd_area;
 908         int ccode, ret;
 909
 910         if ((rfmt == 1) && !css_general_characteristics.fcs)
 911                 return -EINVAL;
 912         if ((rfmt == 2) && !css_general_characteristics.cib)
 913                 return -EINVAL;
 914
 915         memset(page, 0, PAGE_SIZE);
 916         scpd_area = page;
 917         scpd_area->request.length = 0x0010;
 918         scpd_area->request.code = 0x0002;
 919         scpd_area->cssid = chpid.cssid;
 920         scpd_area->first_chpid = chpid.id;
 921         scpd_area->last_chpid = chpid.id;
 922         scpd_area->m = m;
 923         scpd_area->c = c;
 924         scpd_area->fmt = fmt;
 925         scpd_area->rfmt = rfmt;
 926
 927         ccode = chsc(scpd_area);
 928         if (ccode > 0)
 929                 return (ccode == 3) ? -ENODEV : -EBUSY;
 930
 931         ret = chsc_error_from_response(scpd_area->response.code);
 932         if (ret)
 933                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 934                               scpd_area->response.code);
 935         return ret;
 936 }
 937 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 938
 939 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 940                                           struct channel_path_desc *desc)
 941 {
 942         struct chsc_response_struct *chsc_resp;
 943         struct chsc_scpd *scpd_area;
 944         unsigned long flags;
 945         int ret;
 946
 947         spin_lock_irqsave(&chsc_page_lock, flags);
 948         scpd_area = chsc_page;
 949         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 950         if (ret)
 951                 goto out;
 952         chsc_resp = (void *)&scpd_area->response;
 953         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 954 out:
 955         spin_unlock_irqrestore(&chsc_page_lock, flags);
 956         return ret;
 957 }
 958
 959 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 960                                           struct channel_path_desc_fmt1 *desc)
 961 {
 962         struct chsc_response_struct *chsc_resp;
 963         struct chsc_scpd *scpd_area;
 964         unsigned long flags;
 965         int ret;
 966
 967         spin_lock_irqsave(&chsc_page_lock, flags);
 968         scpd_area = chsc_page;
 969         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
 970         if (ret)
 971                 goto out;
 972         chsc_resp = (void *)&scpd_area->response;
 973         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 974 out:
 975         spin_unlock_irqrestore(&chsc_page_lock, flags);
 976         return ret;
 977 }
 978
 979 static void
 980 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 981                           struct cmg_chars *chars)
 982 {
 983         int i, mask;
 984
 985         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 986                 mask = 0x80 >> (i + 3);
 987                 if (cmcv & mask)
 988                         chp->cmg_chars.values[i] = chars->values[i];
 989                 else
 990                         chp->cmg_chars.values[i] = 0;
 991         }
 992 }
 993
 994 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 995 {
 996         int ccode, ret;
 997
 998         struct {
 999                 struct chsc_header request;
1000                 u32 : 24;
1001                 u32 first_chpid : 8;
1002                 u32 : 24;
1003                 u32 last_chpid : 8;
1004                 u32 zeroes1;
1005                 struct chsc_header response;
1006                 u32 zeroes2;
1007                 u32 not_valid : 1;
1008                 u32 shared : 1;
1009                 u32 : 22;
1010                 u32 chpid : 8;
1011                 u32 cmcv : 5;
1012                 u32 : 11;
1013                 u32 cmgq : 8;
1014                 u32 cmg : 8;
1015                 u32 zeroes3;
1016                 u32 data[NR_MEASUREMENT_CHARS];
1017         } __attribute__ ((packed)) *scmc_area;
1018
1019         chp->shared = -1;
1020         chp->cmg = -1;
1021
1022         if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1023                 return 0;
1024
1025         spin_lock_irq(&chsc_page_lock);
1026         memset(chsc_page, 0, PAGE_SIZE);
1027         scmc_area = chsc_page;
1028         scmc_area->request.length = 0x0010;
1029         scmc_area->request.code = 0x0022;
1030         scmc_area->first_chpid = chp->chpid.id;
1031         scmc_area->last_chpid = chp->chpid.id;
1032
1033         ccode = chsc(scmc_area);
1034         if (ccode > 0) {
1035                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1036                 goto out;
1037         }
1038
1039         ret = chsc_error_from_response(scmc_area->response.code);
1040         if (ret) {
1041                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1042                               scmc_area->response.code);
1043                 goto out;
1044         }
1045         if (scmc_area->not_valid)
1046                 goto out;
1047
1048         chp->cmg = scmc_area->cmg;
1049         chp->shared = scmc_area->shared;
1050         if (chp->cmg != 2 && chp->cmg != 3) {
1051                 /* No cmg-dependent data. */
1052                 goto out;
1053         }
1054         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1055                                   (struct cmg_chars *) &scmc_area->data);
1056 out:
1057         spin_unlock_irq(&chsc_page_lock);
1058         return ret;
1059 }
1060
1061 int __init chsc_init(void)
1062 {
1063         int ret;
1064
1065         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1066         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1067         if (!sei_page || !chsc_page) {
1068                 ret = -ENOMEM;
1069                 goto out_err;
1070         }
1071         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1072         if (ret)
1073                 goto out_err;
1074         return ret;
1075 out_err:
1076         free_page((unsigned long)chsc_page);
1077         free_page((unsigned long)sei_page);
1078         return ret;
1079 }
1080
1081 void __init chsc_init_cleanup(void)
1082 {
1083         crw_unregister_handler(CRW_RSC_CSS);
1084         free_page((unsigned long)chsc_page);
1085         free_page((unsigned long)sei_page);
1086 }
1087
1088 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1089 {
1090         int ret;
1091
1092         sda_area->request.length = 0x0400;
1093         sda_area->request.code = 0x0031;
1094         sda_area->operation_code = operation_code;
1095
1096         ret = chsc(sda_area);
1097         if (ret > 0) {
1098                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1099                 goto out;
1100         }
1101
1102         switch (sda_area->response.code) {
1103         case 0x0101:
1104                 ret = -EOPNOTSUPP;
1105                 break;
1106         default:
1107                 ret = chsc_error_from_response(sda_area->response.code);
1108         }
1109 out:
1110         return ret;
1111 }
1112
1113 int chsc_enable_facility(int operation_code)
1114 {
1115         struct chsc_sda_area *sda_area;
1116         unsigned long flags;
1117         int ret;
1118
1119         spin_lock_irqsave(&chsc_page_lock, flags);
1120         memset(chsc_page, 0, PAGE_SIZE);
1121         sda_area = chsc_page;
1122
1123         ret = __chsc_enable_facility(sda_area, operation_code);
1124         if (ret != 0)
1125                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1126                               operation_code, sda_area->response.code);
1127
1128         spin_unlock_irqrestore(&chsc_page_lock, flags);
1129         return ret;
1130 }
1131
1132 struct css_general_char css_general_characteristics;
1133 struct css_chsc_char css_chsc_characteristics;
1134
1135 int __init
1136 chsc_determine_css_characteristics(void)
1137 {
1138         int result;
1139         struct {
1140                 struct chsc_header request;
1141                 u32 reserved1;
1142                 u32 reserved2;
1143                 u32 reserved3;
1144                 struct chsc_header response;
1145                 u32 reserved4;
1146                 u32 general_char[510];
1147                 u32 chsc_char[508];
1148         } __attribute__ ((packed)) *scsc_area;
1149
1150         spin_lock_irq(&chsc_page_lock);
1151         memset(chsc_page, 0, PAGE_SIZE);
1152         scsc_area = chsc_page;
1153         scsc_area->request.length = 0x0010;
1154         scsc_area->request.code = 0x0010;
1155
1156         result = chsc(scsc_area);
1157         if (result) {
1158                 result = (result == 3) ? -ENODEV : -EBUSY;
1159                 goto exit;
1160         }
1161
1162         result = chsc_error_from_response(scsc_area->response.code);
1163         if (result == 0) {
1164                 memcpy(&css_general_characteristics, scsc_area->general_char,
1165                        sizeof(css_general_characteristics));
1166                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1167                        sizeof(css_chsc_characteristics));
1168         } else
1169                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1170                               scsc_area->response.code);
1171 exit:
1172         spin_unlock_irq(&chsc_page_lock);
1173         return result;
1174 }
1175
1176 EXPORT_SYMBOL_GPL(css_general_characteristics);
1177 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1178
1179 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
1180 {
1181         struct {
1182                 struct chsc_header request;
1183                 unsigned int rsvd0;
1184                 unsigned int op : 8;
1185                 unsigned int rsvd1 : 8;
1186                 unsigned int ctrl : 16;
1187                 unsigned int rsvd2[5];
1188                 struct chsc_header response;
1189                 unsigned int rsvd3[7];
1190         } __attribute__ ((packed)) *rr;
1191         int rc;
1192
1193         memset(page, 0, PAGE_SIZE);
1194         rr = page;
1195         rr->request.length = 0x0020;
1196         rr->request.code = 0x0033;
1197         rr->op = op;
1198         rr->ctrl = ctrl;
1199         rc = chsc(rr);
1200         if (rc)
1201                 return -EIO;
1202         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1203         return rc;
1204 }
1205
1206 int chsc_sstpi(void *page, void *result, size_t size)
1207 {
1208         struct {
1209                 struct chsc_header request;
1210                 unsigned int rsvd0[3];
1211                 struct chsc_header response;
1212                 char data[size];
1213         } __attribute__ ((packed)) *rr;
1214         int rc;
1215
1216         memset(page, 0, PAGE_SIZE);
1217         rr = page;
1218         rr->request.length = 0x0010;
1219         rr->request.code = 0x0038;
1220         rc = chsc(rr);
1221         if (rc)
1222                 return -EIO;
1223         memcpy(result, &rr->data, size);
1224         return (rr->response.code == 0x0001) ? 0 : -EIO;
1225 }
1226
1227 int chsc_siosl(struct subchannel_id schid)
1228 {
1229         struct {
1230                 struct chsc_header request;
1231                 u32 word1;
1232                 struct subchannel_id sid;
1233                 u32 word3;
1234                 struct chsc_header response;
1235                 u32 word[11];
1236         } __attribute__ ((packed)) *siosl_area;
1237         unsigned long flags;
1238         int ccode;
1239         int rc;
1240
1241         spin_lock_irqsave(&chsc_page_lock, flags);
1242         memset(chsc_page, 0, PAGE_SIZE);
1243         siosl_area = chsc_page;
1244         siosl_area->request.length = 0x0010;
1245         siosl_area->request.code = 0x0046;
1246         siosl_area->word1 = 0x80000000;
1247         siosl_area->sid = schid;
1248
1249         ccode = chsc(siosl_area);
1250         if (ccode > 0) {
1251                 if (ccode == 3)
1252                         rc = -ENODEV;
1253                 else
1254                         rc = -EBUSY;
1255                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1256                               schid.ssid, schid.sch_no, ccode);
1257                 goto out;
1258         }
1259         rc = chsc_error_from_response(siosl_area->response.code);
1260         if (rc)
1261                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1262                               schid.ssid, schid.sch_no,
1263                               siosl_area->response.code);
1264         else
1265                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1266                               schid.ssid, schid.sch_no);
1267 out:
1268         spin_unlock_irqrestore(&chsc_page_lock, flags);
1269         return rc;
1270 }
1271 EXPORT_SYMBOL_GPL(chsc_siosl);
1272
1273 /**
1274  * chsc_scm_info() - store SCM information (SSI)
1275  * @scm_area: request and response block for SSI
1276  * @token: continuation token
1277  *
1278  * Returns 0 on success.
1279  */
1280 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1281 {
1282         int ccode, ret;
1283
1284         memset(scm_area, 0, sizeof(*scm_area));
1285         scm_area->request.length = 0x0020;
1286         scm_area->request.code = 0x004C;
1287         scm_area->reqtok = token;
1288
1289         ccode = chsc(scm_area);
1290         if (ccode > 0) {
1291                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1292                 goto out;
1293         }
1294         ret = chsc_error_from_response(scm_area->response.code);
1295         if (ret != 0)
1296                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1297                               scm_area->response.code);
1298 out:
1299         return ret;
1300 }
1301 EXPORT_SYMBOL_GPL(chsc_scm_info);
1302
1303 /**
1304  * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info.
1305  * @schid:              id of the subchannel on which PNSO is performed
1306  * @brinfo_area:        request and response block for the operation
1307  * @resume_token:       resume token for multiblock response
1308  * @cnc:                Boolean change-notification control
1309  *
1310  * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1311  *
1312  * Returns 0 on success.
1313  */
1314 int chsc_pnso_brinfo(struct subchannel_id schid,
1315                 struct chsc_pnso_area *brinfo_area,
1316                 struct chsc_brinfo_resume_token resume_token,
1317                 int cnc)
1318 {
1319         memset(brinfo_area, 0, sizeof(*brinfo_area));
1320         brinfo_area->request.length = 0x0030;
1321         brinfo_area->request.code = 0x003d; /* network-subchannel operation */
1322         brinfo_area->m     = schid.m;
1323         brinfo_area->ssid  = schid.ssid;
1324         brinfo_area->sch   = schid.sch_no;
1325         brinfo_area->cssid = schid.cssid;
1326         brinfo_area->oc    = 0; /* Store-network-bridging-information list */
1327         brinfo_area->resume_token = resume_token;
1328         brinfo_area->n     = (cnc != 0);
1329         if (chsc(brinfo_area))
1330                 return -EIO;
1331         return chsc_error_from_response(brinfo_area->response.code);
1332 }
1333 EXPORT_SYMBOL_GPL(chsc_pnso_brinfo);