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         unsigned long flags;
  99         int ccode;
 100         int ret;
 101         int i;
 102         int mask;
 103
 104         spin_lock_irqsave(&chsc_page_lock, flags);
 105         memset(chsc_page, 0, PAGE_SIZE);
 106         ssd_area = chsc_page;
 107         ssd_area->request.length = 0x0010;
 108         ssd_area->request.code = 0x0004;
 109         ssd_area->ssid = schid.ssid;
 110         ssd_area->f_sch = schid.sch_no;
 111         ssd_area->l_sch = schid.sch_no;
 112
 113         ccode = chsc(ssd_area);
 114         /* Check response. */
 115         if (ccode > 0) {
 116                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 117                 goto out;
 118         }
 119         ret = chsc_error_from_response(ssd_area->response.code);
 120         if (ret != 0) {
 121                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 122                               schid.ssid, schid.sch_no,
 123                               ssd_area->response.code);
 124                 goto out;
 125         }
 126         if (!ssd_area->sch_valid) {
 127                 ret = -ENODEV;
 128                 goto out;
 129         }
 130         /* Copy data */
 131         ret = 0;
 132         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 133         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 134             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 135                 goto out;
 136         ssd->path_mask = ssd_area->path_mask;
 137         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 138         for (i = 0; i < 8; i++) {
 139                 mask = 0x80 >> i;
 140                 if (ssd_area->path_mask & mask) {
 141                         chp_id_init(&ssd->chpid[i]);
 142                         ssd->chpid[i].id = ssd_area->chpid[i];
 143                 }
 144                 if (ssd_area->fla_valid_mask & mask)
 145                         ssd->fla[i] = ssd_area->fla[i];
 146         }
 147 out:
 148         spin_unlock_irqrestore(&chsc_page_lock, flags);
 149         return ret;
 150 }
 151
 152 /**
 153  * chsc_ssqd() - store subchannel QDIO data (SSQD)
 154  * @schid: id of the subchannel on which SSQD is performed
 155  * @ssqd: request and response block for SSQD
 156  *
 157  * Returns 0 on success.
 158  */
 159 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 160 {
 161         memset(ssqd, 0, sizeof(*ssqd));
 162         ssqd->request.length = 0x0010;
 163         ssqd->request.code = 0x0024;
 164         ssqd->first_sch = schid.sch_no;
 165         ssqd->last_sch = schid.sch_no;
 166         ssqd->ssid = schid.ssid;
 167
 168         if (chsc(ssqd))
 169                 return -EIO;
 170
 171         return chsc_error_from_response(ssqd->response.code);
 172 }
 173 EXPORT_SYMBOL_GPL(chsc_ssqd);
 174
 175 /**
 176  * chsc_sadc() - set adapter device controls (SADC)
 177  * @schid: id of the subchannel on which SADC is performed
 178  * @scssc: request and response block for SADC
 179  * @summary_indicator_addr: summary indicator address
 180  * @subchannel_indicator_addr: subchannel indicator address
 181  *
 182  * Returns 0 on success.
 183  */
 184 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
 185               u64 summary_indicator_addr, u64 subchannel_indicator_addr)
 186 {
 187         memset(scssc, 0, sizeof(*scssc));
 188         scssc->request.length = 0x0fe0;
 189         scssc->request.code = 0x0021;
 190         scssc->operation_code = 0;
 191
 192         scssc->summary_indicator_addr = summary_indicator_addr;
 193         scssc->subchannel_indicator_addr = subchannel_indicator_addr;
 194
 195         scssc->ks = PAGE_DEFAULT_KEY >> 4;
 196         scssc->kc = PAGE_DEFAULT_KEY >> 4;
 197         scssc->isc = QDIO_AIRQ_ISC;
 198         scssc->schid = schid;
 199
 200         /* enable the time delay disablement facility */
 201         if (css_general_characteristics.aif_tdd)
 202                 scssc->word_with_d_bit = 0x10000000;
 203
 204         if (chsc(scssc))
 205                 return -EIO;
 206
 207         return chsc_error_from_response(scssc->response.code);
 208 }
 209 EXPORT_SYMBOL_GPL(chsc_sadc);
 210
 211 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 212 {
 213         spin_lock_irq(sch->lock);
 214         if (sch->driver && sch->driver->chp_event)
 215                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 216                         goto out_unreg;
 217         spin_unlock_irq(sch->lock);
 218         return 0;
 219
 220 out_unreg:
 221         sch->lpm = 0;
 222         spin_unlock_irq(sch->lock);
 223         css_schedule_eval(sch->schid);
 224         return 0;
 225 }
 226
 227 void chsc_chp_offline(struct chp_id chpid)
 228 {
 229         struct channel_path *chp = chpid_to_chp(chpid);
 230         struct chp_link link;
 231         char dbf_txt[15];
 232
 233         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 234         CIO_TRACE_EVENT(2, dbf_txt);
 235
 236         if (chp_get_status(chpid) <= 0)
 237                 return;
 238         memset(&link, 0, sizeof(struct chp_link));
 239         link.chpid = chpid;
 240         /* Wait until previous actions have settled. */
 241         css_wait_for_slow_path();
 242
 243         mutex_lock(&chp->lock);
 244         chp_update_desc(chp);
 245         mutex_unlock(&chp->lock);
 246
 247         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 248 }
 249
 250 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 251 {
 252         spin_lock_irq(sch->lock);
 253         if (sch->driver && sch->driver->chp_event)
 254                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 255         spin_unlock_irq(sch->lock);
 256
 257         return 0;
 258 }
 259
 260 static void s390_process_res_acc(struct chp_link *link)
 261 {
 262         char dbf_txt[15];
 263
 264         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 265                 link->chpid.id);
 266         CIO_TRACE_EVENT( 2, dbf_txt);
 267         if (link->fla != 0) {
 268                 sprintf(dbf_txt, "fla%x", link->fla);
 269                 CIO_TRACE_EVENT( 2, dbf_txt);
 270         }
 271         /* Wait until previous actions have settled. */
 272         css_wait_for_slow_path();
 273         /*
 274          * I/O resources may have become accessible.
 275          * Scan through all subchannels that may be concerned and
 276          * do a validation on those.
 277          * The more information we have (info), the less scanning
 278          * will we have to do.
 279          */
 280         for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
 281         css_schedule_reprobe();
 282 }
 283
 284 struct chsc_sei_nt0_area {
 285         u8  flags;
 286         u8  vf;                         /* validity flags */
 287         u8  rs;                         /* reporting source */
 288         u8  cc;                         /* content code */
 289         u16 fla;                        /* full link address */
 290         u16 rsid;                       /* reporting source id */
 291         u32 reserved1;
 292         u32 reserved2;
 293         /* ccdf has to be big enough for a link-incident record */
 294         u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 295 } __packed;
 296
 297 struct chsc_sei_nt2_area {
 298         u8  flags;                      /* p and v bit */
 299         u8  reserved1;
 300         u8  reserved2;
 301         u8  cc;                         /* content code */
 302         u32 reserved3[13];
 303         u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 304 } __packed;
 305
 306 #define CHSC_SEI_NT0    (1ULL << 63)
 307 #define CHSC_SEI_NT2    (1ULL << 61)
 308
 309 struct chsc_sei {
 310         struct chsc_header request;
 311         u32 reserved1;
 312         u64 ntsm;                       /* notification type mask */
 313         struct chsc_header response;
 314         u32 :24;
 315         u8 nt;
 316         union {
 317                 struct chsc_sei_nt0_area nt0_area;
 318                 struct chsc_sei_nt2_area nt2_area;
 319                 u8 nt_area[PAGE_SIZE - 24];
 320         } u;
 321 } __packed;
 322
 323 /*
 324  * Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands"
 325  */
 326
 327 #define ND_VALIDITY_VALID       0
 328 #define ND_VALIDITY_OUTDATED    1
 329 #define ND_VALIDITY_INVALID     2
 330
 331 struct node_descriptor {
 332         /* Flags. */
 333         union {
 334                 struct {
 335                         u32 validity:3;
 336                         u32 reserved:5;
 337                 } __packed;
 338                 u8 byte0;
 339         } __packed;
 340
 341         /* Node parameters. */
 342         u32 params:24;
 343
 344         /* Node ID. */
 345         char type[6];
 346         char model[3];
 347         char manufacturer[3];
 348         char plant[2];
 349         char seq[12];
 350         u16 tag;
 351 } __packed;
 352
 353 /*
 354  * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
 355  */
 356
 357 #define LIR_IQ_CLASS_INFO               0
 358 #define LIR_IQ_CLASS_DEGRADED           1
 359 #define LIR_IQ_CLASS_NOT_OPERATIONAL    2
 360
 361 struct lir {
 362         struct {
 363                 u32 null:1;
 364                 u32 reserved:3;
 365                 u32 class:2;
 366                 u32 reserved2:2;
 367         } __packed iq;
 368         u32 ic:8;
 369         u32 reserved:16;
 370         struct node_descriptor incident_node;
 371         struct node_descriptor attached_node;
 372         u8 reserved2[32];
 373 } __packed;
 374
 375 #define PARAMS_LEN      10      /* PARAMS=xx,xxxxxx */
 376 #define NODEID_LEN      35      /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 377
 378 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
 379 static char *store_ebcdic(char *dest, const char *src, unsigned long len,
 380                           char delim)
 381 {
 382         memcpy(dest, src, len);
 383         EBCASC(dest, len);
 384
 385         if (delim)
 386                 dest[len++] = delim;
 387
 388         return dest + len;
 389 }
 390
 391 /* Format node ID and parameters for output in LIR log message. */
 392 static void format_node_data(char *params, char *id, struct node_descriptor *nd)
 393 {
 394         memset(params, 0, PARAMS_LEN);
 395         memset(id, 0, NODEID_LEN);
 396
 397         if (nd->validity != ND_VALIDITY_VALID) {
 398                 strncpy(params, "n/a", PARAMS_LEN - 1);
 399                 strncpy(id, "n/a", NODEID_LEN - 1);
 400                 return;
 401         }
 402
 403         /* PARAMS=xx,xxxxxx */
 404         snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
 405         /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 406         id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
 407         id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
 408         id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
 409         id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
 410         id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
 411         sprintf(id, "%04X", nd->tag);
 412 }
 413
 414 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 415 {
 416         struct lir *lir = (struct lir *) &sei_area->ccdf;
 417         char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
 418              aunodeid[NODEID_LEN];
 419
 420         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
 421                       sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
 422
 423         /* Ignore NULL Link Incident Records. */
 424         if (lir->iq.null)
 425                 return;
 426
 427         /* Inform user that a link requires maintenance actions because it has
 428          * become degraded or not operational. Note that this log message is
 429          * the primary intention behind a Link Incident Record. */
 430
 431         format_node_data(iuparams, iunodeid, &lir->incident_node);
 432         format_node_data(auparams, aunodeid, &lir->attached_node);
 433
 434         switch (lir->iq.class) {
 435         case LIR_IQ_CLASS_DEGRADED:
 436                 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
 437                         "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 438                         sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 439                         iunodeid, auparams, aunodeid);
 440                 break;
 441         case LIR_IQ_CLASS_NOT_OPERATIONAL:
 442                 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
 443                        "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 444                        sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 445                        iunodeid, auparams, aunodeid);
 446                 break;
 447         default:
 448                 break;
 449         }
 450 }
 451
 452 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 453 {
 454         struct channel_path *chp;
 455         struct chp_link link;
 456         struct chp_id chpid;
 457         int status;
 458
 459         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 460                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 461         if (sei_area->rs != 4)
 462                 return;
 463         chp_id_init(&chpid);
 464         chpid.id = sei_area->rsid;
 465         /* allocate a new channel path structure, if needed */
 466         status = chp_get_status(chpid);
 467         if (!status)
 468                 return;
 469
 470         if (status < 0) {
 471                 chp_new(chpid);
 472         } else {
 473                 chp = chpid_to_chp(chpid);
 474                 mutex_lock(&chp->lock);
 475                 chp_update_desc(chp);
 476                 mutex_unlock(&chp->lock);
 477         }
 478         memset(&link, 0, sizeof(struct chp_link));
 479         link.chpid = chpid;
 480         if ((sei_area->vf & 0xc0) != 0) {
 481                 link.fla = sei_area->fla;
 482                 if ((sei_area->vf & 0xc0) == 0xc0)
 483                         /* full link address */
 484                         link.fla_mask = 0xffff;
 485                 else
 486                         /* link address */
 487                         link.fla_mask = 0xff00;
 488         }
 489         s390_process_res_acc(&link);
 490 }
 491
 492 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 493 {
 494         struct channel_path *chp;
 495         struct chp_id chpid;
 496         u8 *data;
 497         int num;
 498
 499         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 500         if (sei_area->rs != 0)
 501                 return;
 502         data = sei_area->ccdf;
 503         chp_id_init(&chpid);
 504         for (num = 0; num <= __MAX_CHPID; num++) {
 505                 if (!chp_test_bit(data, num))
 506                         continue;
 507                 chpid.id = num;
 508
 509                 CIO_CRW_EVENT(4, "Update information for channel path "
 510                               "%x.%02x\n", chpid.cssid, chpid.id);
 511                 chp = chpid_to_chp(chpid);
 512                 if (!chp) {
 513                         chp_new(chpid);
 514                         continue;
 515                 }
 516                 mutex_lock(&chp->lock);
 517                 chp_update_desc(chp);
 518                 mutex_unlock(&chp->lock);
 519         }
 520 }
 521
 522 struct chp_config_data {
 523         u8 map[32];
 524         u8 op;
 525         u8 pc;
 526 };
 527
 528 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 529 {
 530         struct chp_config_data *data;
 531         struct chp_id chpid;
 532         int num;
 533         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 534
 535         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 536         if (sei_area->rs != 0)
 537                 return;
 538         data = (struct chp_config_data *) &(sei_area->ccdf);
 539         chp_id_init(&chpid);
 540         for (num = 0; num <= __MAX_CHPID; num++) {
 541                 if (!chp_test_bit(data->map, num))
 542                         continue;
 543                 chpid.id = num;
 544                 pr_notice("Processing %s for channel path %x.%02x\n",
 545                           events[data->op], chpid.cssid, chpid.id);
 546                 switch (data->op) {
 547                 case 0:
 548                         chp_cfg_schedule(chpid, 1);
 549                         break;
 550                 case 1:
 551                         chp_cfg_schedule(chpid, 0);
 552                         break;
 553                 case 2:
 554                         chp_cfg_cancel_deconfigure(chpid);
 555                         break;
 556                 }
 557         }
 558 }
 559
 560 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 561 {
 562         int ret;
 563
 564         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 565         if (sei_area->rs != 7)
 566                 return;
 567
 568         ret = scm_update_information();
 569         if (ret)
 570                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 571                               " failed (rc=%d).\n", ret);
 572 }
 573
 574 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 575 {
 576         int ret;
 577
 578         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 579         if (sei_area->rs != 7)
 580                 return;
 581
 582         ret = scm_process_availability_information();
 583         if (ret)
 584                 CIO_CRW_EVENT(0, "chsc: process availability information"
 585                               " failed (rc=%d).\n", ret);
 586 }
 587
 588 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 589 {
 590         switch (sei_area->cc) {
 591         case 1:
 592                 zpci_event_error(sei_area->ccdf);
 593                 break;
 594         case 2:
 595                 zpci_event_availability(sei_area->ccdf);
 596                 break;
 597         default:
 598                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 599                               sei_area->cc);
 600                 break;
 601         }
 602 }
 603
 604 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 605 {
 606         /* which kind of information was stored? */
 607         switch (sei_area->cc) {
 608         case 1: /* link incident*/
 609                 chsc_process_sei_link_incident(sei_area);
 610                 break;
 611         case 2: /* i/o resource accessibility */
 612                 chsc_process_sei_res_acc(sei_area);
 613                 break;
 614         case 7: /* channel-path-availability information */
 615                 chsc_process_sei_chp_avail(sei_area);
 616                 break;
 617         case 8: /* channel-path-configuration notification */
 618                 chsc_process_sei_chp_config(sei_area);
 619                 break;
 620         case 12: /* scm change notification */
 621                 chsc_process_sei_scm_change(sei_area);
 622                 break;
 623         case 14: /* scm available notification */
 624                 chsc_process_sei_scm_avail(sei_area);
 625                 break;
 626         default: /* other stuff */
 627                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 628                               sei_area->cc);
 629                 break;
 630         }
 631
 632         /* Check if we might have lost some information. */
 633         if (sei_area->flags & 0x40) {
 634                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 635                 css_schedule_eval_all();
 636         }
 637 }
 638
 639 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 640 {
 641         static int ntsm_unsupported;
 642
 643         while (true) {
 644                 memset(sei, 0, sizeof(*sei));
 645                 sei->request.length = 0x0010;
 646                 sei->request.code = 0x000e;
 647                 if (!ntsm_unsupported)
 648                         sei->ntsm = ntsm;
 649
 650                 if (chsc(sei))
 651                         break;
 652
 653                 if (sei->response.code != 0x0001) {
 654                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
 655                                       sei->response.code, sei->ntsm);
 656
 657                         if (sei->response.code == 3 && sei->ntsm) {
 658                                 /* Fallback for old firmware. */
 659                                 ntsm_unsupported = 1;
 660                                 continue;
 661                         }
 662                         break;
 663                 }
 664
 665                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 666                 switch (sei->nt) {
 667                 case 0:
 668                         chsc_process_sei_nt0(&sei->u.nt0_area);
 669                         break;
 670                 case 2:
 671                         chsc_process_sei_nt2(&sei->u.nt2_area);
 672                         break;
 673                 default:
 674                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 675                         break;
 676                 }
 677
 678                 if (!(sei->u.nt0_area.flags & 0x80))
 679                         break;
 680         }
 681 }
 682
 683 /*
 684  * Handle channel subsystem related CRWs.
 685  * Use store event information to find out what's going on.
 686  *
 687  * Note: Access to sei_page is serialized through machine check handler
 688  * thread, so no need for locking.
 689  */
 690 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 691 {
 692         struct chsc_sei *sei = sei_page;
 693
 694         if (overflow) {
 695                 css_schedule_eval_all();
 696                 return;
 697         }
 698         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 699                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 700                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 701                       crw0->erc, crw0->rsid);
 702
 703         CIO_TRACE_EVENT(2, "prcss");
 704         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 705 }
 706
 707 void chsc_chp_online(struct chp_id chpid)
 708 {
 709         struct channel_path *chp = chpid_to_chp(chpid);
 710         struct chp_link link;
 711         char dbf_txt[15];
 712
 713         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 714         CIO_TRACE_EVENT(2, dbf_txt);
 715
 716         if (chp_get_status(chpid) != 0) {
 717                 memset(&link, 0, sizeof(struct chp_link));
 718                 link.chpid = chpid;
 719                 /* Wait until previous actions have settled. */
 720                 css_wait_for_slow_path();
 721
 722                 mutex_lock(&chp->lock);
 723                 chp_update_desc(chp);
 724                 mutex_unlock(&chp->lock);
 725
 726                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 727                                            &link);
 728                 css_schedule_reprobe();
 729         }
 730 }
 731
 732 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 733                                          struct chp_id chpid, int on)
 734 {
 735         unsigned long flags;
 736         struct chp_link link;
 737
 738         memset(&link, 0, sizeof(struct chp_link));
 739         link.chpid = chpid;
 740         spin_lock_irqsave(sch->lock, flags);
 741         if (sch->driver && sch->driver->chp_event)
 742                 sch->driver->chp_event(sch, &link,
 743                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 744         spin_unlock_irqrestore(sch->lock, flags);
 745 }
 746
 747 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 748 {
 749         struct chp_id *chpid = data;
 750
 751         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 752         return 0;
 753 }
 754
 755 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 756 {
 757         struct chp_id *chpid = data;
 758
 759         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 760         return 0;
 761 }
 762
 763 /**
 764  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 765  * @chpid: channl-path ID
 766  * @on: non-zero for vary online, zero for vary offline
 767  */
 768 int chsc_chp_vary(struct chp_id chpid, int on)
 769 {
 770         struct channel_path *chp = chpid_to_chp(chpid);
 771
 772         /*
 773          * Redo PathVerification on the devices the chpid connects to
 774          */
 775         if (on) {
 776                 /* Try to update the channel path description. */
 777                 chp_update_desc(chp);
 778                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 779                                            NULL, &chpid);
 780                 css_schedule_reprobe();
 781         } else
 782                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 783                                            NULL, &chpid);
 784
 785         return 0;
 786 }
 787
 788 static void
 789 chsc_remove_cmg_attr(struct channel_subsystem *css)
 790 {
 791         int i;
 792
 793         for (i = 0; i <= __MAX_CHPID; i++) {
 794                 if (!css->chps[i])
 795                         continue;
 796                 chp_remove_cmg_attr(css->chps[i]);
 797         }
 798 }
 799
 800 static int
 801 chsc_add_cmg_attr(struct channel_subsystem *css)
 802 {
 803         int i, ret;
 804
 805         ret = 0;
 806         for (i = 0; i <= __MAX_CHPID; i++) {
 807                 if (!css->chps[i])
 808                         continue;
 809                 ret = chp_add_cmg_attr(css->chps[i]);
 810                 if (ret)
 811                         goto cleanup;
 812         }
 813         return ret;
 814 cleanup:
 815         for (--i; i >= 0; i--) {
 816                 if (!css->chps[i])
 817                         continue;
 818                 chp_remove_cmg_attr(css->chps[i]);
 819         }
 820         return ret;
 821 }
 822
 823 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 824 {
 825         struct {
 826                 struct chsc_header request;
 827                 u32 operation_code : 2;
 828                 u32 : 30;
 829                 u32 key : 4;
 830                 u32 : 28;
 831                 u32 zeroes1;
 832                 u32 cub_addr1;
 833                 u32 zeroes2;
 834                 u32 cub_addr2;
 835                 u32 reserved[13];
 836                 struct chsc_header response;
 837                 u32 status : 8;
 838                 u32 : 4;
 839                 u32 fmt : 4;
 840                 u32 : 16;
 841         } __attribute__ ((packed)) *secm_area;
 842         unsigned long flags;
 843         int ret, ccode;
 844
 845         spin_lock_irqsave(&chsc_page_lock, flags);
 846         memset(chsc_page, 0, PAGE_SIZE);
 847         secm_area = chsc_page;
 848         secm_area->request.length = 0x0050;
 849         secm_area->request.code = 0x0016;
 850
 851         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 852         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 853         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 854
 855         secm_area->operation_code = enable ? 0 : 1;
 856
 857         ccode = chsc(secm_area);
 858         if (ccode > 0) {
 859                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 860                 goto out;
 861         }
 862
 863         switch (secm_area->response.code) {
 864         case 0x0102:
 865         case 0x0103:
 866                 ret = -EINVAL;
 867                 break;
 868         default:
 869                 ret = chsc_error_from_response(secm_area->response.code);
 870         }
 871         if (ret != 0)
 872                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 873                               secm_area->response.code);
 874 out:
 875         spin_unlock_irqrestore(&chsc_page_lock, flags);
 876         return ret;
 877 }
 878
 879 int
 880 chsc_secm(struct channel_subsystem *css, int enable)
 881 {
 882         int ret;
 883
 884         if (enable && !css->cm_enabled) {
 885                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 886                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 887                 if (!css->cub_addr1 || !css->cub_addr2) {
 888                         free_page((unsigned long)css->cub_addr1);
 889                         free_page((unsigned long)css->cub_addr2);
 890                         return -ENOMEM;
 891                 }
 892         }
 893         ret = __chsc_do_secm(css, enable);
 894         if (!ret) {
 895                 css->cm_enabled = enable;
 896                 if (css->cm_enabled) {
 897                         ret = chsc_add_cmg_attr(css);
 898                         if (ret) {
 899                                 __chsc_do_secm(css, 0);
 900                                 css->cm_enabled = 0;
 901                         }
 902                 } else
 903                         chsc_remove_cmg_attr(css);
 904         }
 905         if (!css->cm_enabled) {
 906                 free_page((unsigned long)css->cub_addr1);
 907                 free_page((unsigned long)css->cub_addr2);
 908         }
 909         return ret;
 910 }
 911
 912 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 913                                      int c, int m, void *page)
 914 {
 915         struct chsc_scpd *scpd_area;
 916         int ccode, ret;
 917
 918         if ((rfmt == 1 || rfmt == 0) && c == 1 &&
 919             !css_general_characteristics.fcs)
 920                 return -EINVAL;
 921         if ((rfmt == 2) && !css_general_characteristics.cib)
 922                 return -EINVAL;
 923
 924         memset(page, 0, PAGE_SIZE);
 925         scpd_area = page;
 926         scpd_area->request.length = 0x0010;
 927         scpd_area->request.code = 0x0002;
 928         scpd_area->cssid = chpid.cssid;
 929         scpd_area->first_chpid = chpid.id;
 930         scpd_area->last_chpid = chpid.id;
 931         scpd_area->m = m;
 932         scpd_area->c = c;
 933         scpd_area->fmt = fmt;
 934         scpd_area->rfmt = rfmt;
 935
 936         ccode = chsc(scpd_area);
 937         if (ccode > 0)
 938                 return (ccode == 3) ? -ENODEV : -EBUSY;
 939
 940         ret = chsc_error_from_response(scpd_area->response.code);
 941         if (ret)
 942                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 943                               scpd_area->response.code);
 944         return ret;
 945 }
 946 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 947
 948 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 949                                           struct channel_path_desc *desc)
 950 {
 951         struct chsc_scpd *scpd_area;
 952         unsigned long flags;
 953         int ret;
 954
 955         spin_lock_irqsave(&chsc_page_lock, flags);
 956         scpd_area = chsc_page;
 957         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 958         if (ret)
 959                 goto out;
 960
 961         memcpy(desc, scpd_area->data, sizeof(*desc));
 962 out:
 963         spin_unlock_irqrestore(&chsc_page_lock, flags);
 964         return ret;
 965 }
 966
 967 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 968                                           struct channel_path_desc_fmt1 *desc)
 969 {
 970         struct chsc_scpd *scpd_area;
 971         unsigned long flags;
 972         int ret;
 973
 974         spin_lock_irqsave(&chsc_page_lock, flags);
 975         scpd_area = chsc_page;
 976         ret = chsc_determine_channel_path_desc(chpid, 0, 1, 1, 0, scpd_area);
 977         if (ret)
 978                 goto out;
 979
 980         memcpy(desc, scpd_area->data, sizeof(*desc));
 981 out:
 982         spin_unlock_irqrestore(&chsc_page_lock, flags);
 983         return ret;
 984 }
 985
 986 static void
 987 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 988                           struct cmg_chars *chars)
 989 {
 990         int i, mask;
 991
 992         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 993                 mask = 0x80 >> (i + 3);
 994                 if (cmcv & mask)
 995                         chp->cmg_chars.values[i] = chars->values[i];
 996                 else
 997                         chp->cmg_chars.values[i] = 0;
 998         }
 999 }
1000
1001 int chsc_get_channel_measurement_chars(struct channel_path *chp)
1002 {
1003         unsigned long flags;
1004         int ccode, ret;
1005
1006         struct {
1007                 struct chsc_header request;
1008                 u32 : 24;
1009                 u32 first_chpid : 8;
1010                 u32 : 24;
1011                 u32 last_chpid : 8;
1012                 u32 zeroes1;
1013                 struct chsc_header response;
1014                 u32 zeroes2;
1015                 u32 not_valid : 1;
1016                 u32 shared : 1;
1017                 u32 : 22;
1018                 u32 chpid : 8;
1019                 u32 cmcv : 5;
1020                 u32 : 11;
1021                 u32 cmgq : 8;
1022                 u32 cmg : 8;
1023                 u32 zeroes3;
1024                 u32 data[NR_MEASUREMENT_CHARS];
1025         } __attribute__ ((packed)) *scmc_area;
1026
1027         chp->shared = -1;
1028         chp->cmg = -1;
1029
1030         if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1031                 return -EINVAL;
1032
1033         spin_lock_irqsave(&chsc_page_lock, flags);
1034         memset(chsc_page, 0, PAGE_SIZE);
1035         scmc_area = chsc_page;
1036         scmc_area->request.length = 0x0010;
1037         scmc_area->request.code = 0x0022;
1038         scmc_area->first_chpid = chp->chpid.id;
1039         scmc_area->last_chpid = chp->chpid.id;
1040
1041         ccode = chsc(scmc_area);
1042         if (ccode > 0) {
1043                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1044                 goto out;
1045         }
1046
1047         ret = chsc_error_from_response(scmc_area->response.code);
1048         if (ret) {
1049                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1050                               scmc_area->response.code);
1051                 goto out;
1052         }
1053         if (scmc_area->not_valid)
1054                 goto out;
1055
1056         chp->cmg = scmc_area->cmg;
1057         chp->shared = scmc_area->shared;
1058         if (chp->cmg != 2 && chp->cmg != 3) {
1059                 /* No cmg-dependent data. */
1060                 goto out;
1061         }
1062         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1063                                   (struct cmg_chars *) &scmc_area->data);
1064 out:
1065         spin_unlock_irqrestore(&chsc_page_lock, flags);
1066         return ret;
1067 }
1068
1069 int __init chsc_init(void)
1070 {
1071         int ret;
1072
1073         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1074         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1075         if (!sei_page || !chsc_page) {
1076                 ret = -ENOMEM;
1077                 goto out_err;
1078         }
1079         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1080         if (ret)
1081                 goto out_err;
1082         return ret;
1083 out_err:
1084         free_page((unsigned long)chsc_page);
1085         free_page((unsigned long)sei_page);
1086         return ret;
1087 }
1088
1089 void __init chsc_init_cleanup(void)
1090 {
1091         crw_unregister_handler(CRW_RSC_CSS);
1092         free_page((unsigned long)chsc_page);
1093         free_page((unsigned long)sei_page);
1094 }
1095
1096 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1097 {
1098         int ret;
1099
1100         sda_area->request.length = 0x0400;
1101         sda_area->request.code = 0x0031;
1102         sda_area->operation_code = operation_code;
1103
1104         ret = chsc(sda_area);
1105         if (ret > 0) {
1106                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1107                 goto out;
1108         }
1109
1110         switch (sda_area->response.code) {
1111         case 0x0101:
1112                 ret = -EOPNOTSUPP;
1113                 break;
1114         default:
1115                 ret = chsc_error_from_response(sda_area->response.code);
1116         }
1117 out:
1118         return ret;
1119 }
1120
1121 int chsc_enable_facility(int operation_code)
1122 {
1123         struct chsc_sda_area *sda_area;
1124         unsigned long flags;
1125         int ret;
1126
1127         spin_lock_irqsave(&chsc_page_lock, flags);
1128         memset(chsc_page, 0, PAGE_SIZE);
1129         sda_area = chsc_page;
1130
1131         ret = __chsc_enable_facility(sda_area, operation_code);
1132         if (ret != 0)
1133                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1134                               operation_code, sda_area->response.code);
1135
1136         spin_unlock_irqrestore(&chsc_page_lock, flags);
1137         return ret;
1138 }
1139
1140 struct css_general_char css_general_characteristics;
1141 struct css_chsc_char css_chsc_characteristics;
1142
1143 int __init
1144 chsc_determine_css_characteristics(void)
1145 {
1146         unsigned long flags;
1147         int result;
1148         struct {
1149                 struct chsc_header request;
1150                 u32 reserved1;
1151                 u32 reserved2;
1152                 u32 reserved3;
1153                 struct chsc_header response;
1154                 u32 reserved4;
1155                 u32 general_char[510];
1156                 u32 chsc_char[508];
1157         } __attribute__ ((packed)) *scsc_area;
1158
1159         spin_lock_irqsave(&chsc_page_lock, flags);
1160         memset(chsc_page, 0, PAGE_SIZE);
1161         scsc_area = chsc_page;
1162         scsc_area->request.length = 0x0010;
1163         scsc_area->request.code = 0x0010;
1164
1165         result = chsc(scsc_area);
1166         if (result) {
1167                 result = (result == 3) ? -ENODEV : -EBUSY;
1168                 goto exit;
1169         }
1170
1171         result = chsc_error_from_response(scsc_area->response.code);
1172         if (result == 0) {
1173                 memcpy(&css_general_characteristics, scsc_area->general_char,
1174                        sizeof(css_general_characteristics));
1175                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1176                        sizeof(css_chsc_characteristics));
1177         } else
1178                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1179                               scsc_area->response.code);
1180 exit:
1181         spin_unlock_irqrestore(&chsc_page_lock, flags);
1182         return result;
1183 }
1184
1185 EXPORT_SYMBOL_GPL(css_general_characteristics);
1186 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1187
1188 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta)
1189 {
1190         struct {
1191                 struct chsc_header request;
1192                 unsigned int rsvd0;
1193                 unsigned int op : 8;
1194                 unsigned int rsvd1 : 8;
1195                 unsigned int ctrl : 16;
1196                 unsigned int rsvd2[5];
1197                 struct chsc_header response;
1198                 unsigned int rsvd3[3];
1199                 u64 clock_delta;
1200                 unsigned int rsvd4[2];
1201         } __attribute__ ((packed)) *rr;
1202         int rc;
1203
1204         memset(page, 0, PAGE_SIZE);
1205         rr = page;
1206         rr->request.length = 0x0020;
1207         rr->request.code = 0x0033;
1208         rr->op = op;
1209         rr->ctrl = ctrl;
1210         rc = chsc(rr);
1211         if (rc)
1212                 return -EIO;
1213         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1214         if (clock_delta)
1215                 *clock_delta = rr->clock_delta;
1216         return rc;
1217 }
1218
1219 int chsc_sstpi(void *page, void *result, size_t size)
1220 {
1221         struct {
1222                 struct chsc_header request;
1223                 unsigned int rsvd0[3];
1224                 struct chsc_header response;
1225                 char data[size];
1226         } __attribute__ ((packed)) *rr;
1227         int rc;
1228
1229         memset(page, 0, PAGE_SIZE);
1230         rr = page;
1231         rr->request.length = 0x0010;
1232         rr->request.code = 0x0038;
1233         rc = chsc(rr);
1234         if (rc)
1235                 return -EIO;
1236         memcpy(result, &rr->data, size);
1237         return (rr->response.code == 0x0001) ? 0 : -EIO;
1238 }
1239
1240 int chsc_siosl(struct subchannel_id schid)
1241 {
1242         struct {
1243                 struct chsc_header request;
1244                 u32 word1;
1245                 struct subchannel_id sid;
1246                 u32 word3;
1247                 struct chsc_header response;
1248                 u32 word[11];
1249         } __attribute__ ((packed)) *siosl_area;
1250         unsigned long flags;
1251         int ccode;
1252         int rc;
1253
1254         spin_lock_irqsave(&chsc_page_lock, flags);
1255         memset(chsc_page, 0, PAGE_SIZE);
1256         siosl_area = chsc_page;
1257         siosl_area->request.length = 0x0010;
1258         siosl_area->request.code = 0x0046;
1259         siosl_area->word1 = 0x80000000;
1260         siosl_area->sid = schid;
1261
1262         ccode = chsc(siosl_area);
1263         if (ccode > 0) {
1264                 if (ccode == 3)
1265                         rc = -ENODEV;
1266                 else
1267                         rc = -EBUSY;
1268                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1269                               schid.ssid, schid.sch_no, ccode);
1270                 goto out;
1271         }
1272         rc = chsc_error_from_response(siosl_area->response.code);
1273         if (rc)
1274                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1275                               schid.ssid, schid.sch_no,
1276                               siosl_area->response.code);
1277         else
1278                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1279                               schid.ssid, schid.sch_no);
1280 out:
1281         spin_unlock_irqrestore(&chsc_page_lock, flags);
1282         return rc;
1283 }
1284 EXPORT_SYMBOL_GPL(chsc_siosl);
1285
1286 /**
1287  * chsc_scm_info() - store SCM information (SSI)
1288  * @scm_area: request and response block for SSI
1289  * @token: continuation token
1290  *
1291  * Returns 0 on success.
1292  */
1293 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1294 {
1295         int ccode, ret;
1296
1297         memset(scm_area, 0, sizeof(*scm_area));
1298         scm_area->request.length = 0x0020;
1299         scm_area->request.code = 0x004C;
1300         scm_area->reqtok = token;
1301
1302         ccode = chsc(scm_area);
1303         if (ccode > 0) {
1304                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1305                 goto out;
1306         }
1307         ret = chsc_error_from_response(scm_area->response.code);
1308         if (ret != 0)
1309                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1310                               scm_area->response.code);
1311 out:
1312         return ret;
1313 }
1314 EXPORT_SYMBOL_GPL(chsc_scm_info);
1315
1316 /**
1317  * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info.
1318  * @schid:              id of the subchannel on which PNSO is performed
1319  * @brinfo_area:        request and response block for the operation
1320  * @resume_token:       resume token for multiblock response
1321  * @cnc:                Boolean change-notification control
1322  *
1323  * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1324  *
1325  * Returns 0 on success.
1326  */
1327 int chsc_pnso_brinfo(struct subchannel_id schid,
1328                 struct chsc_pnso_area *brinfo_area,
1329                 struct chsc_brinfo_resume_token resume_token,
1330                 int cnc)
1331 {
1332         memset(brinfo_area, 0, sizeof(*brinfo_area));
1333         brinfo_area->request.length = 0x0030;
1334         brinfo_area->request.code = 0x003d; /* network-subchannel operation */
1335         brinfo_area->m     = schid.m;
1336         brinfo_area->ssid  = schid.ssid;
1337         brinfo_area->sch   = schid.sch_no;
1338         brinfo_area->cssid = schid.cssid;
1339         brinfo_area->oc    = 0; /* Store-network-bridging-information list */
1340         brinfo_area->resume_token = resume_token;
1341         brinfo_area->n     = (cnc != 0);
1342         if (chsc(brinfo_area))
1343                 return -EIO;
1344         return chsc_error_from_response(brinfo_area->response.code);
1345 }
1346 EXPORT_SYMBOL_GPL(chsc_pnso_brinfo);