drivers/s390/cio/chsc.c

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