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