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
  28 #include "css.h"
  29 #include "cio.h"
  30 #include "cio_debug.h"
  31 #include "ioasm.h"
  32 #include "chp.h"
  33 #include "chsc.h"
  34
  35 static void *sei_page;
  36 static void *chsc_page;
  37 static DEFINE_SPINLOCK(chsc_page_lock);
  38
  39 /**
  40  * chsc_error_from_response() - convert a chsc response to an error
  41  * @response: chsc response code
  42  *
  43  * Returns an appropriate Linux error code for @response.
  44  */
  45 int chsc_error_from_response(int response)
  46 {
  47         switch (response) {
  48         case 0x0001:
  49                 return 0;
  50         case 0x0002:
  51         case 0x0003:
  52         case 0x0006:
  53         case 0x0007:
  54         case 0x0008:
  55         case 0x000a:
  56         case 0x0104:
  57                 return -EINVAL;
  58         case 0x0004:
  59                 return -EOPNOTSUPP;
  60         case 0x000b:
  61         case 0x0107:            /* "Channel busy" for the op 0x003d */
  62                 return -EBUSY;
  63         case 0x0100:
  64         case 0x0102:
  65                 return -ENOMEM;
  66         default:
  67                 return -EIO;
  68         }
  69 }
  70 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  71
  72 struct chsc_ssd_area {
  73         struct chsc_header request;
  74         u16 :10;
  75         u16 ssid:2;
  76         u16 :4;
  77         u16 f_sch;        /* first subchannel */
  78         u16 :16;
  79         u16 l_sch;        /* last subchannel */
  80         u32 :32;
  81         struct chsc_header response;
  82         u32 :32;
  83         u8 sch_valid : 1;
  84         u8 dev_valid : 1;
  85         u8 st        : 3; /* subchannel type */
  86         u8 zeroes    : 3;
  87         u8  unit_addr;    /* unit address */
  88         u16 devno;        /* device number */
  89         u8 path_mask;
  90         u8 fla_valid_mask;
  91         u16 sch;          /* subchannel */
  92         u8 chpid[8];      /* chpids 0-7 */
  93         u16 fla[8];       /* full link addresses 0-7 */
  94 } __packed __aligned(PAGE_SIZE);
  95
  96 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  97 {
  98         struct chsc_ssd_area *ssd_area;
  99         unsigned long flags;
 100         int ccode;
 101         int ret;
 102         int i;
 103         int mask;
 104
 105         spin_lock_irqsave(&chsc_page_lock, flags);
 106         memset(chsc_page, 0, PAGE_SIZE);
 107         ssd_area = chsc_page;
 108         ssd_area->request.length = 0x0010;
 109         ssd_area->request.code = 0x0004;
 110         ssd_area->ssid = schid.ssid;
 111         ssd_area->f_sch = schid.sch_no;
 112         ssd_area->l_sch = schid.sch_no;
 113
 114         ccode = chsc(ssd_area);
 115         /* Check response. */
 116         if (ccode > 0) {
 117                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 118                 goto out;
 119         }
 120         ret = chsc_error_from_response(ssd_area->response.code);
 121         if (ret != 0) {
 122                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 123                               schid.ssid, schid.sch_no,
 124                               ssd_area->response.code);
 125                 goto out;
 126         }
 127         if (!ssd_area->sch_valid) {
 128                 ret = -ENODEV;
 129                 goto out;
 130         }
 131         /* Copy data */
 132         ret = 0;
 133         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 134         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 135             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 136                 goto out;
 137         ssd->path_mask = ssd_area->path_mask;
 138         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 139         for (i = 0; i < 8; i++) {
 140                 mask = 0x80 >> i;
 141                 if (ssd_area->path_mask & mask) {
 142                         chp_id_init(&ssd->chpid[i]);
 143                         ssd->chpid[i].id = ssd_area->chpid[i];
 144                 }
 145                 if (ssd_area->fla_valid_mask & mask)
 146                         ssd->fla[i] = ssd_area->fla[i];
 147         }
 148 out:
 149         spin_unlock_irqrestore(&chsc_page_lock, flags);
 150         return ret;
 151 }
 152
 153 /**
 154  * chsc_ssqd() - store subchannel QDIO data (SSQD)
 155  * @schid: id of the subchannel on which SSQD is performed
 156  * @ssqd: request and response block for SSQD
 157  *
 158  * Returns 0 on success.
 159  */
 160 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 161 {
 162         memset(ssqd, 0, sizeof(*ssqd));
 163         ssqd->request.length = 0x0010;
 164         ssqd->request.code = 0x0024;
 165         ssqd->first_sch = schid.sch_no;
 166         ssqd->last_sch = schid.sch_no;
 167         ssqd->ssid = schid.ssid;
 168
 169         if (chsc(ssqd))
 170                 return -EIO;
 171
 172         return chsc_error_from_response(ssqd->response.code);
 173 }
 174 EXPORT_SYMBOL_GPL(chsc_ssqd);
 175
 176 /**
 177  * chsc_sadc() - set adapter device controls (SADC)
 178  * @schid: id of the subchannel on which SADC is performed
 179  * @scssc: request and response block for SADC
 180  * @summary_indicator_addr: summary indicator address
 181  * @subchannel_indicator_addr: subchannel indicator address
 182  *
 183  * Returns 0 on success.
 184  */
 185 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
 186               u64 summary_indicator_addr, u64 subchannel_indicator_addr)
 187 {
 188         memset(scssc, 0, sizeof(*scssc));
 189         scssc->request.length = 0x0fe0;
 190         scssc->request.code = 0x0021;
 191         scssc->operation_code = 0;
 192
 193         scssc->summary_indicator_addr = summary_indicator_addr;
 194         scssc->subchannel_indicator_addr = subchannel_indicator_addr;
 195
 196         scssc->ks = PAGE_DEFAULT_KEY >> 4;
 197         scssc->kc = PAGE_DEFAULT_KEY >> 4;
 198         scssc->isc = QDIO_AIRQ_ISC;
 199         scssc->schid = schid;
 200
 201         /* enable the time delay disablement facility */
 202         if (css_general_characteristics.aif_tdd)
 203                 scssc->word_with_d_bit = 0x10000000;
 204
 205         if (chsc(scssc))
 206                 return -EIO;
 207
 208         return chsc_error_from_response(scssc->response.code);
 209 }
 210 EXPORT_SYMBOL_GPL(chsc_sadc);
 211
 212 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 213 {
 214         spin_lock_irq(sch->lock);
 215         if (sch->driver && sch->driver->chp_event)
 216                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 217                         goto out_unreg;
 218         spin_unlock_irq(sch->lock);
 219         return 0;
 220
 221 out_unreg:
 222         sch->lpm = 0;
 223         spin_unlock_irq(sch->lock);
 224         css_schedule_eval(sch->schid);
 225         return 0;
 226 }
 227
 228 void chsc_chp_offline(struct chp_id chpid)
 229 {
 230         struct channel_path *chp = chpid_to_chp(chpid);
 231         struct chp_link link;
 232         char dbf_txt[15];
 233
 234         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 235         CIO_TRACE_EVENT(2, dbf_txt);
 236
 237         if (chp_get_status(chpid) <= 0)
 238                 return;
 239         memset(&link, 0, sizeof(struct chp_link));
 240         link.chpid = chpid;
 241         /* Wait until previous actions have settled. */
 242         css_wait_for_slow_path();
 243
 244         mutex_lock(&chp->lock);
 245         chp_update_desc(chp);
 246         mutex_unlock(&chp->lock);
 247
 248         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 249 }
 250
 251 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 252 {
 253         spin_lock_irq(sch->lock);
 254         if (sch->driver && sch->driver->chp_event)
 255                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 256         spin_unlock_irq(sch->lock);
 257
 258         return 0;
 259 }
 260
 261 static void s390_process_res_acc(struct chp_link *link)
 262 {
 263         char dbf_txt[15];
 264
 265         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 266                 link->chpid.id);
 267         CIO_TRACE_EVENT( 2, dbf_txt);
 268         if (link->fla != 0) {
 269                 sprintf(dbf_txt, "fla%x", link->fla);
 270                 CIO_TRACE_EVENT( 2, dbf_txt);
 271         }
 272         /* Wait until previous actions have settled. */
 273         css_wait_for_slow_path();
 274         /*
 275          * I/O resources may have become accessible.
 276          * Scan through all subchannels that may be concerned and
 277          * do a validation on those.
 278          * The more information we have (info), the less scanning
 279          * will we have to do.
 280          */
 281         for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
 282         css_schedule_reprobe();
 283 }
 284
 285 struct chsc_sei_nt0_area {
 286         u8  flags;
 287         u8  vf;                         /* validity flags */
 288         u8  rs;                         /* reporting source */
 289         u8  cc;                         /* content code */
 290         u16 fla;                        /* full link address */
 291         u16 rsid;                       /* reporting source id */
 292         u32 reserved1;
 293         u32 reserved2;
 294         /* ccdf has to be big enough for a link-incident record */
 295         u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 296 } __packed;
 297
 298 struct chsc_sei_nt2_area {
 299         u8  flags;                      /* p and v bit */
 300         u8  reserved1;
 301         u8  reserved2;
 302         u8  cc;                         /* content code */
 303         u32 reserved3[13];
 304         u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 305 } __packed;
 306
 307 #define CHSC_SEI_NT0    (1ULL << 63)
 308 #define CHSC_SEI_NT2    (1ULL << 61)
 309
 310 struct chsc_sei {
 311         struct chsc_header request;
 312         u32 reserved1;
 313         u64 ntsm;                       /* notification type mask */
 314         struct chsc_header response;
 315         u32 :24;
 316         u8 nt;
 317         union {
 318                 struct chsc_sei_nt0_area nt0_area;
 319                 struct chsc_sei_nt2_area nt2_area;
 320                 u8 nt_area[PAGE_SIZE - 24];
 321         } u;
 322 } __packed __aligned(PAGE_SIZE);
 323
 324 /*
 325  * Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands"
 326  */
 327
 328 #define ND_VALIDITY_VALID       0
 329 #define ND_VALIDITY_OUTDATED    1
 330 #define ND_VALIDITY_INVALID     2
 331
 332 struct node_descriptor {
 333         /* Flags. */
 334         union {
 335                 struct {
 336                         u32 validity:3;
 337                         u32 reserved:5;
 338                 } __packed;
 339                 u8 byte0;
 340         } __packed;
 341
 342         /* Node parameters. */
 343         u32 params:24;
 344
 345         /* Node ID. */
 346         char type[6];
 347         char model[3];
 348         char manufacturer[3];
 349         char plant[2];
 350         char seq[12];
 351         u16 tag;
 352 } __packed;
 353
 354 /*
 355  * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
 356  */
 357
 358 #define LIR_IQ_CLASS_INFO               0
 359 #define LIR_IQ_CLASS_DEGRADED           1
 360 #define LIR_IQ_CLASS_NOT_OPERATIONAL    2
 361
 362 struct lir {
 363         struct {
 364                 u32 null:1;
 365                 u32 reserved:3;
 366                 u32 class:2;
 367                 u32 reserved2:2;
 368         } __packed iq;
 369         u32 ic:8;
 370         u32 reserved:16;
 371         struct node_descriptor incident_node;
 372         struct node_descriptor attached_node;
 373         u8 reserved2[32];
 374 } __packed;
 375
 376 #define PARAMS_LEN      10      /* PARAMS=xx,xxxxxx */
 377 #define NODEID_LEN      35      /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 378
 379 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
 380 static char *store_ebcdic(char *dest, const char *src, unsigned long len,
 381                           char delim)
 382 {
 383         memcpy(dest, src, len);
 384         EBCASC(dest, len);
 385
 386         if (delim)
 387                 dest[len++] = delim;
 388
 389         return dest + len;
 390 }
 391
 392 /* Format node ID and parameters for output in LIR log message. */
 393 static void format_node_data(char *params, char *id, struct node_descriptor *nd)
 394 {
 395         memset(params, 0, PARAMS_LEN);
 396         memset(id, 0, NODEID_LEN);
 397
 398         if (nd->validity != ND_VALIDITY_VALID) {
 399                 strncpy(params, "n/a", PARAMS_LEN - 1);
 400                 strncpy(id, "n/a", NODEID_LEN - 1);
 401                 return;
 402         }
 403
 404         /* PARAMS=xx,xxxxxx */
 405         snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
 406         /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 407         id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
 408         id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
 409         id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
 410         id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
 411         id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
 412         sprintf(id, "%04X", nd->tag);
 413 }
 414
 415 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 416 {
 417         struct lir *lir = (struct lir *) &sei_area->ccdf;
 418         char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
 419              aunodeid[NODEID_LEN];
 420
 421         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
 422                       sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
 423
 424         /* Ignore NULL Link Incident Records. */
 425         if (lir->iq.null)
 426                 return;
 427
 428         /* Inform user that a link requires maintenance actions because it has
 429          * become degraded or not operational. Note that this log message is
 430          * the primary intention behind a Link Incident Record. */
 431
 432         format_node_data(iuparams, iunodeid, &lir->incident_node);
 433         format_node_data(auparams, aunodeid, &lir->attached_node);
 434
 435         switch (lir->iq.class) {
 436         case LIR_IQ_CLASS_DEGRADED:
 437                 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
 438                         "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 439                         sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 440                         iunodeid, auparams, aunodeid);
 441                 break;
 442         case LIR_IQ_CLASS_NOT_OPERATIONAL:
 443                 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
 444                        "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 445                        sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 446                        iunodeid, auparams, aunodeid);
 447                 break;
 448         default:
 449                 break;
 450         }
 451 }
 452
 453 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 454 {
 455         struct channel_path *chp;
 456         struct chp_link link;
 457         struct chp_id chpid;
 458         int status;
 459
 460         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 461                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 462         if (sei_area->rs != 4)
 463                 return;
 464         chp_id_init(&chpid);
 465         chpid.id = sei_area->rsid;
 466         /* allocate a new channel path structure, if needed */
 467         status = chp_get_status(chpid);
 468         if (!status)
 469                 return;
 470
 471         if (status < 0) {
 472                 chp_new(chpid);
 473         } else {
 474                 chp = chpid_to_chp(chpid);
 475                 mutex_lock(&chp->lock);
 476                 chp_update_desc(chp);
 477                 mutex_unlock(&chp->lock);
 478         }
 479         memset(&link, 0, sizeof(struct chp_link));
 480         link.chpid = chpid;
 481         if ((sei_area->vf & 0xc0) != 0) {
 482                 link.fla = sei_area->fla;
 483                 if ((sei_area->vf & 0xc0) == 0xc0)
 484                         /* full link address */
 485                         link.fla_mask = 0xffff;
 486                 else
 487                         /* link address */
 488                         link.fla_mask = 0xff00;
 489         }
 490         s390_process_res_acc(&link);
 491 }
 492
 493 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 494 {
 495         struct channel_path *chp;
 496         struct chp_id chpid;
 497         u8 *data;
 498         int num;
 499
 500         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 501         if (sei_area->rs != 0)
 502                 return;
 503         data = sei_area->ccdf;
 504         chp_id_init(&chpid);
 505         for (num = 0; num <= __MAX_CHPID; num++) {
 506                 if (!chp_test_bit(data, num))
 507                         continue;
 508                 chpid.id = num;
 509
 510                 CIO_CRW_EVENT(4, "Update information for channel path "
 511                               "%x.%02x\n", chpid.cssid, chpid.id);
 512                 chp = chpid_to_chp(chpid);
 513                 if (!chp) {
 514                         chp_new(chpid);
 515                         continue;
 516                 }
 517                 mutex_lock(&chp->lock);
 518                 chp_update_desc(chp);
 519                 mutex_unlock(&chp->lock);
 520         }
 521 }
 522
 523 struct chp_config_data {
 524         u8 map[32];
 525         u8 op;
 526         u8 pc;
 527 };
 528
 529 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 530 {
 531         struct chp_config_data *data;
 532         struct chp_id chpid;
 533         int num;
 534         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 535
 536         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 537         if (sei_area->rs != 0)
 538                 return;
 539         data = (struct chp_config_data *) &(sei_area->ccdf);
 540         chp_id_init(&chpid);
 541         for (num = 0; num <= __MAX_CHPID; num++) {
 542                 if (!chp_test_bit(data->map, num))
 543                         continue;
 544                 chpid.id = num;
 545                 pr_notice("Processing %s for channel path %x.%02x\n",
 546                           events[data->op], chpid.cssid, chpid.id);
 547                 switch (data->op) {
 548                 case 0:
 549                         chp_cfg_schedule(chpid, 1);
 550                         break;
 551                 case 1:
 552                         chp_cfg_schedule(chpid, 0);
 553                         break;
 554                 case 2:
 555                         chp_cfg_cancel_deconfigure(chpid);
 556                         break;
 557                 }
 558         }
 559 }
 560
 561 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 562 {
 563         int ret;
 564
 565         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 566         if (sei_area->rs != 7)
 567                 return;
 568
 569         ret = scm_update_information();
 570         if (ret)
 571                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 572                               " failed (rc=%d).\n", ret);
 573 }
 574
 575 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 576 {
 577         int ret;
 578
 579         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 580         if (sei_area->rs != 7)
 581                 return;
 582
 583         ret = scm_process_availability_information();
 584         if (ret)
 585                 CIO_CRW_EVENT(0, "chsc: process availability information"
 586                               " failed (rc=%d).\n", ret);
 587 }
 588
 589 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 590 {
 591         switch (sei_area->cc) {
 592         case 1:
 593                 zpci_event_error(sei_area->ccdf);
 594                 break;
 595         case 2:
 596                 zpci_event_availability(sei_area->ccdf);
 597                 break;
 598         default:
 599                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 600                               sei_area->cc);
 601                 break;
 602         }
 603 }
 604
 605 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 606 {
 607         /* which kind of information was stored? */
 608         switch (sei_area->cc) {
 609         case 1: /* link incident*/
 610                 chsc_process_sei_link_incident(sei_area);
 611                 break;
 612         case 2: /* i/o resource accessibility */
 613                 chsc_process_sei_res_acc(sei_area);
 614                 break;
 615         case 7: /* channel-path-availability information */
 616                 chsc_process_sei_chp_avail(sei_area);
 617                 break;
 618         case 8: /* channel-path-configuration notification */
 619                 chsc_process_sei_chp_config(sei_area);
 620                 break;
 621         case 12: /* scm change notification */
 622                 chsc_process_sei_scm_change(sei_area);
 623                 break;
 624         case 14: /* scm available notification */
 625                 chsc_process_sei_scm_avail(sei_area);
 626                 break;
 627         default: /* other stuff */
 628                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 629                               sei_area->cc);
 630                 break;
 631         }
 632
 633         /* Check if we might have lost some information. */
 634         if (sei_area->flags & 0x40) {
 635                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 636                 css_schedule_eval_all();
 637         }
 638 }
 639
 640 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 641 {
 642         static int ntsm_unsupported;
 643
 644         while (true) {
 645                 memset(sei, 0, sizeof(*sei));
 646                 sei->request.length = 0x0010;
 647                 sei->request.code = 0x000e;
 648                 if (!ntsm_unsupported)
 649                         sei->ntsm = ntsm;
 650
 651                 if (chsc(sei))
 652                         break;
 653
 654                 if (sei->response.code != 0x0001) {
 655                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
 656                                       sei->response.code, sei->ntsm);
 657
 658                         if (sei->response.code == 3 && sei->ntsm) {
 659                                 /* Fallback for old firmware. */
 660                                 ntsm_unsupported = 1;
 661                                 continue;
 662                         }
 663                         break;
 664                 }
 665
 666                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 667                 switch (sei->nt) {
 668                 case 0:
 669                         chsc_process_sei_nt0(&sei->u.nt0_area);
 670                         break;
 671                 case 2:
 672                         chsc_process_sei_nt2(&sei->u.nt2_area);
 673                         break;
 674                 default:
 675                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 676                         break;
 677                 }
 678
 679                 if (!(sei->u.nt0_area.flags & 0x80))
 680                         break;
 681         }
 682 }
 683
 684 /*
 685  * Handle channel subsystem related CRWs.
 686  * Use store event information to find out what's going on.
 687  *
 688  * Note: Access to sei_page is serialized through machine check handler
 689  * thread, so no need for locking.
 690  */
 691 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 692 {
 693         struct chsc_sei *sei = sei_page;
 694
 695         if (overflow) {
 696                 css_schedule_eval_all();
 697                 return;
 698         }
 699         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 700                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 701                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 702                       crw0->erc, crw0->rsid);
 703
 704         CIO_TRACE_EVENT(2, "prcss");
 705         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 706 }
 707
 708 void chsc_chp_online(struct chp_id chpid)
 709 {
 710         struct channel_path *chp = chpid_to_chp(chpid);
 711         struct chp_link link;
 712         char dbf_txt[15];
 713
 714         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 715         CIO_TRACE_EVENT(2, dbf_txt);
 716
 717         if (chp_get_status(chpid) != 0) {
 718                 memset(&link, 0, sizeof(struct chp_link));
 719                 link.chpid = chpid;
 720                 /* Wait until previous actions have settled. */
 721                 css_wait_for_slow_path();
 722
 723                 mutex_lock(&chp->lock);
 724                 chp_update_desc(chp);
 725                 mutex_unlock(&chp->lock);
 726
 727                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 728                                            &link);
 729                 css_schedule_reprobe();
 730         }
 731 }
 732
 733 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 734                                          struct chp_id chpid, int on)
 735 {
 736         unsigned long flags;
 737         struct chp_link link;
 738
 739         memset(&link, 0, sizeof(struct chp_link));
 740         link.chpid = chpid;
 741         spin_lock_irqsave(sch->lock, flags);
 742         if (sch->driver && sch->driver->chp_event)
 743                 sch->driver->chp_event(sch, &link,
 744                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 745         spin_unlock_irqrestore(sch->lock, flags);
 746 }
 747
 748 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 749 {
 750         struct chp_id *chpid = data;
 751
 752         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 753         return 0;
 754 }
 755
 756 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 757 {
 758         struct chp_id *chpid = data;
 759
 760         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 761         return 0;
 762 }
 763
 764 /**
 765  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 766  * @chpid: channl-path ID
 767  * @on: non-zero for vary online, zero for vary offline
 768  */
 769 int chsc_chp_vary(struct chp_id chpid, int on)
 770 {
 771         struct channel_path *chp = chpid_to_chp(chpid);
 772
 773         /* Wait until previous actions have settled. */
 774         css_wait_for_slow_path();
 775         /*
 776          * Redo PathVerification on the devices the chpid connects to
 777          */
 778         if (on) {
 779                 /* Try to update the channel path description. */
 780                 chp_update_desc(chp);
 781                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 782                                            NULL, &chpid);
 783                 css_schedule_reprobe();
 784         } else
 785                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 786                                            NULL, &chpid);
 787
 788         return 0;
 789 }
 790
 791 static void
 792 chsc_remove_cmg_attr(struct channel_subsystem *css)
 793 {
 794         int i;
 795
 796         for (i = 0; i <= __MAX_CHPID; i++) {
 797                 if (!css->chps[i])
 798                         continue;
 799                 chp_remove_cmg_attr(css->chps[i]);
 800         }
 801 }
 802
 803 static int
 804 chsc_add_cmg_attr(struct channel_subsystem *css)
 805 {
 806         int i, ret;
 807
 808         ret = 0;
 809         for (i = 0; i <= __MAX_CHPID; i++) {
 810                 if (!css->chps[i])
 811                         continue;
 812                 ret = chp_add_cmg_attr(css->chps[i]);
 813                 if (ret)
 814                         goto cleanup;
 815         }
 816         return ret;
 817 cleanup:
 818         for (--i; i >= 0; i--) {
 819                 if (!css->chps[i])
 820                         continue;
 821                 chp_remove_cmg_attr(css->chps[i]);
 822         }
 823         return ret;
 824 }
 825
 826 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 827 {
 828         struct {
 829                 struct chsc_header request;
 830                 u32 operation_code : 2;
 831                 u32 : 30;
 832                 u32 key : 4;
 833                 u32 : 28;
 834                 u32 zeroes1;
 835                 u32 cub_addr1;
 836                 u32 zeroes2;
 837                 u32 cub_addr2;
 838                 u32 reserved[13];
 839                 struct chsc_header response;
 840                 u32 status : 8;
 841                 u32 : 4;
 842                 u32 fmt : 4;
 843                 u32 : 16;
 844         } *secm_area;
 845         unsigned long flags;
 846         int ret, ccode;
 847
 848         spin_lock_irqsave(&chsc_page_lock, flags);
 849         memset(chsc_page, 0, PAGE_SIZE);
 850         secm_area = chsc_page;
 851         secm_area->request.length = 0x0050;
 852         secm_area->request.code = 0x0016;
 853
 854         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 855         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 856         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 857
 858         secm_area->operation_code = enable ? 0 : 1;
 859
 860         ccode = chsc(secm_area);
 861         if (ccode > 0) {
 862                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 863                 goto out;
 864         }
 865
 866         switch (secm_area->response.code) {
 867         case 0x0102:
 868         case 0x0103:
 869                 ret = -EINVAL;
 870                 break;
 871         default:
 872                 ret = chsc_error_from_response(secm_area->response.code);
 873         }
 874         if (ret != 0)
 875                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 876                               secm_area->response.code);
 877 out:
 878         spin_unlock_irqrestore(&chsc_page_lock, flags);
 879         return ret;
 880 }
 881
 882 int
 883 chsc_secm(struct channel_subsystem *css, int enable)
 884 {
 885         int ret;
 886
 887         if (enable && !css->cm_enabled) {
 888                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 889                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 890                 if (!css->cub_addr1 || !css->cub_addr2) {
 891                         free_page((unsigned long)css->cub_addr1);
 892                         free_page((unsigned long)css->cub_addr2);
 893                         return -ENOMEM;
 894                 }
 895         }
 896         ret = __chsc_do_secm(css, enable);
 897         if (!ret) {
 898                 css->cm_enabled = enable;
 899                 if (css->cm_enabled) {
 900                         ret = chsc_add_cmg_attr(css);
 901                         if (ret) {
 902                                 __chsc_do_secm(css, 0);
 903                                 css->cm_enabled = 0;
 904                         }
 905                 } else
 906                         chsc_remove_cmg_attr(css);
 907         }
 908         if (!css->cm_enabled) {
 909                 free_page((unsigned long)css->cub_addr1);
 910                 free_page((unsigned long)css->cub_addr2);
 911         }
 912         return ret;
 913 }
 914
 915 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 916                                      int c, int m, void *page)
 917 {
 918         struct chsc_scpd *scpd_area;
 919         int ccode, ret;
 920
 921         if ((rfmt == 1 || rfmt == 0) && c == 1 &&
 922             !css_general_characteristics.fcs)
 923                 return -EINVAL;
 924         if ((rfmt == 2) && !css_general_characteristics.cib)
 925                 return -EINVAL;
 926         if ((rfmt == 3) && !css_general_characteristics.util_str)
 927                 return -EINVAL;
 928
 929         memset(page, 0, PAGE_SIZE);
 930         scpd_area = page;
 931         scpd_area->request.length = 0x0010;
 932         scpd_area->request.code = 0x0002;
 933         scpd_area->cssid = chpid.cssid;
 934         scpd_area->first_chpid = chpid.id;
 935         scpd_area->last_chpid = chpid.id;
 936         scpd_area->m = m;
 937         scpd_area->c = c;
 938         scpd_area->fmt = fmt;
 939         scpd_area->rfmt = rfmt;
 940
 941         ccode = chsc(scpd_area);
 942         if (ccode > 0)
 943                 return (ccode == 3) ? -ENODEV : -EBUSY;
 944
 945         ret = chsc_error_from_response(scpd_area->response.code);
 946         if (ret)
 947                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 948                               scpd_area->response.code);
 949         return ret;
 950 }
 951 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 952
 953 #define chsc_det_chp_desc(FMT, c)                                       \
 954 int chsc_determine_fmt##FMT##_channel_path_desc(                        \
 955         struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc)   \
 956 {                                                                       \
 957         struct chsc_scpd *scpd_area;                                    \
 958         unsigned long flags;                                            \
 959         int ret;                                                        \
 960                                                                         \
 961         spin_lock_irqsave(&chsc_page_lock, flags);                      \
 962         scpd_area = chsc_page;                                          \
 963         ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0,     \
 964                                                scpd_area);              \
 965         if (ret)                                                        \
 966                 goto out;                                               \
 967                                                                         \
 968         memcpy(desc, scpd_area->data, sizeof(*desc));                   \
 969 out:                                                                    \
 970         spin_unlock_irqrestore(&chsc_page_lock, flags);                 \
 971         return ret;                                                     \
 972 }
 973
 974 chsc_det_chp_desc(0, 0)
 975 chsc_det_chp_desc(1, 1)
 976 chsc_det_chp_desc(3, 0)
 977
 978 static void
 979 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 980                           struct cmg_chars *chars)
 981 {
 982         int i, mask;
 983
 984         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 985                 mask = 0x80 >> (i + 3);
 986                 if (cmcv & mask)
 987                         chp->cmg_chars.values[i] = chars->values[i];
 988                 else
 989                         chp->cmg_chars.values[i] = 0;
 990         }
 991 }
 992
 993 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 994 {
 995         unsigned long flags;
 996         int ccode, ret;
 997
 998         struct {
 999                 struct chsc_header request;
1000                 u32 : 24;
1001                 u32 first_chpid : 8;
1002                 u32 : 24;
1003                 u32 last_chpid : 8;
1004                 u32 zeroes1;
1005                 struct chsc_header response;
1006                 u32 zeroes2;
1007                 u32 not_valid : 1;
1008                 u32 shared : 1;
1009                 u32 : 22;
1010                 u32 chpid : 8;
1011                 u32 cmcv : 5;
1012                 u32 : 11;
1013                 u32 cmgq : 8;
1014                 u32 cmg : 8;
1015                 u32 zeroes3;
1016                 u32 data[NR_MEASUREMENT_CHARS];
1017         } *scmc_area;
1018
1019         chp->shared = -1;
1020         chp->cmg = -1;
1021
1022         if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1023                 return -EINVAL;
1024
1025         spin_lock_irqsave(&chsc_page_lock, flags);
1026         memset(chsc_page, 0, PAGE_SIZE);
1027         scmc_area = chsc_page;
1028         scmc_area->request.length = 0x0010;
1029         scmc_area->request.code = 0x0022;
1030         scmc_area->first_chpid = chp->chpid.id;
1031         scmc_area->last_chpid = chp->chpid.id;
1032
1033         ccode = chsc(scmc_area);
1034         if (ccode > 0) {
1035                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1036                 goto out;
1037         }
1038
1039         ret = chsc_error_from_response(scmc_area->response.code);
1040         if (ret) {
1041                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1042                               scmc_area->response.code);
1043                 goto out;
1044         }
1045         if (scmc_area->not_valid)
1046                 goto out;
1047
1048         chp->cmg = scmc_area->cmg;
1049         chp->shared = scmc_area->shared;
1050         if (chp->cmg != 2 && chp->cmg != 3) {
1051                 /* No cmg-dependent data. */
1052                 goto out;
1053         }
1054         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1055                                   (struct cmg_chars *) &scmc_area->data);
1056 out:
1057         spin_unlock_irqrestore(&chsc_page_lock, flags);
1058         return ret;
1059 }
1060
1061 int __init chsc_init(void)
1062 {
1063         int ret;
1064
1065         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1066         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1067         if (!sei_page || !chsc_page) {
1068                 ret = -ENOMEM;
1069                 goto out_err;
1070         }
1071         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1072         if (ret)
1073                 goto out_err;
1074         return ret;
1075 out_err:
1076         free_page((unsigned long)chsc_page);
1077         free_page((unsigned long)sei_page);
1078         return ret;
1079 }
1080
1081 void __init chsc_init_cleanup(void)
1082 {
1083         crw_unregister_handler(CRW_RSC_CSS);
1084         free_page((unsigned long)chsc_page);
1085         free_page((unsigned long)sei_page);
1086 }
1087
1088 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1089 {
1090         int ret;
1091
1092         sda_area->request.length = 0x0400;
1093         sda_area->request.code = 0x0031;
1094         sda_area->operation_code = operation_code;
1095
1096         ret = chsc(sda_area);
1097         if (ret > 0) {
1098                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1099                 goto out;
1100         }
1101
1102         switch (sda_area->response.code) {
1103         case 0x0101:
1104                 ret = -EOPNOTSUPP;
1105                 break;
1106         default:
1107                 ret = chsc_error_from_response(sda_area->response.code);
1108         }
1109 out:
1110         return ret;
1111 }
1112
1113 int chsc_enable_facility(int operation_code)
1114 {
1115         struct chsc_sda_area *sda_area;
1116         unsigned long flags;
1117         int ret;
1118
1119         spin_lock_irqsave(&chsc_page_lock, flags);
1120         memset(chsc_page, 0, PAGE_SIZE);
1121         sda_area = chsc_page;
1122
1123         ret = __chsc_enable_facility(sda_area, operation_code);
1124         if (ret != 0)
1125                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1126                               operation_code, sda_area->response.code);
1127
1128         spin_unlock_irqrestore(&chsc_page_lock, flags);
1129         return ret;
1130 }
1131
1132 int __init chsc_get_cssid(int idx)
1133 {
1134         struct {
1135                 struct chsc_header request;
1136                 u8 atype;
1137                 u32 : 24;
1138                 u32 reserved1[6];
1139                 struct chsc_header response;
1140                 u32 reserved2[3];
1141                 struct {
1142                         u8 cssid;
1143                         u32 : 24;
1144                 } list[0];
1145         } *sdcal_area;
1146         int ret;
1147
1148         spin_lock_irq(&chsc_page_lock);
1149         memset(chsc_page, 0, PAGE_SIZE);
1150         sdcal_area = chsc_page;
1151         sdcal_area->request.length = 0x0020;
1152         sdcal_area->request.code = 0x0034;
1153         sdcal_area->atype = 4;
1154
1155         ret = chsc(sdcal_area);
1156         if (ret) {
1157                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1158                 goto exit;
1159         }
1160
1161         ret = chsc_error_from_response(sdcal_area->response.code);
1162         if (ret) {
1163                 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
1164                               sdcal_area->response.code);
1165                 goto exit;
1166         }
1167
1168         if ((addr_t) &sdcal_area->list[idx] <
1169             (addr_t) &sdcal_area->response + sdcal_area->response.length)
1170                 ret = sdcal_area->list[idx].cssid;
1171         else
1172                 ret = -ENODEV;
1173 exit:
1174         spin_unlock_irq(&chsc_page_lock);
1175         return ret;
1176 }
1177
1178 struct css_general_char css_general_characteristics;
1179 struct css_chsc_char css_chsc_characteristics;
1180
1181 int __init
1182 chsc_determine_css_characteristics(void)
1183 {
1184         unsigned long flags;
1185         int result;
1186         struct {
1187                 struct chsc_header request;
1188                 u32 reserved1;
1189                 u32 reserved2;
1190                 u32 reserved3;
1191                 struct chsc_header response;
1192                 u32 reserved4;
1193                 u32 general_char[510];
1194                 u32 chsc_char[508];
1195         } *scsc_area;
1196
1197         spin_lock_irqsave(&chsc_page_lock, flags);
1198         memset(chsc_page, 0, PAGE_SIZE);
1199         scsc_area = chsc_page;
1200         scsc_area->request.length = 0x0010;
1201         scsc_area->request.code = 0x0010;
1202
1203         result = chsc(scsc_area);
1204         if (result) {
1205                 result = (result == 3) ? -ENODEV : -EBUSY;
1206                 goto exit;
1207         }
1208
1209         result = chsc_error_from_response(scsc_area->response.code);
1210         if (result == 0) {
1211                 memcpy(&css_general_characteristics, scsc_area->general_char,
1212                        sizeof(css_general_characteristics));
1213                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1214                        sizeof(css_chsc_characteristics));
1215         } else
1216                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1217                               scsc_area->response.code);
1218 exit:
1219         spin_unlock_irqrestore(&chsc_page_lock, flags);
1220         return result;
1221 }
1222
1223 EXPORT_SYMBOL_GPL(css_general_characteristics);
1224 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1225
1226 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta)
1227 {
1228         struct {
1229                 struct chsc_header request;
1230                 unsigned int rsvd0;
1231                 unsigned int op : 8;
1232                 unsigned int rsvd1 : 8;
1233                 unsigned int ctrl : 16;
1234                 unsigned int rsvd2[5];
1235                 struct chsc_header response;
1236                 unsigned int rsvd3[3];
1237                 u64 clock_delta;
1238                 unsigned int rsvd4[2];
1239         } *rr;
1240         int rc;
1241
1242         memset(page, 0, PAGE_SIZE);
1243         rr = page;
1244         rr->request.length = 0x0020;
1245         rr->request.code = 0x0033;
1246         rr->op = op;
1247         rr->ctrl = ctrl;
1248         rc = chsc(rr);
1249         if (rc)
1250                 return -EIO;
1251         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1252         if (clock_delta)
1253                 *clock_delta = rr->clock_delta;
1254         return rc;
1255 }
1256
1257 int chsc_sstpi(void *page, void *result, size_t size)
1258 {
1259         struct {
1260                 struct chsc_header request;
1261                 unsigned int rsvd0[3];
1262                 struct chsc_header response;
1263                 char data[];
1264         } *rr;
1265         int rc;
1266
1267         memset(page, 0, PAGE_SIZE);
1268         rr = page;
1269         rr->request.length = 0x0010;
1270         rr->request.code = 0x0038;
1271         rc = chsc(rr);
1272         if (rc)
1273                 return -EIO;
1274         memcpy(result, &rr->data, size);
1275         return (rr->response.code == 0x0001) ? 0 : -EIO;
1276 }
1277
1278 int chsc_siosl(struct subchannel_id schid)
1279 {
1280         struct {
1281                 struct chsc_header request;
1282                 u32 word1;
1283                 struct subchannel_id sid;
1284                 u32 word3;
1285                 struct chsc_header response;
1286                 u32 word[11];
1287         } *siosl_area;
1288         unsigned long flags;
1289         int ccode;
1290         int rc;
1291
1292         spin_lock_irqsave(&chsc_page_lock, flags);
1293         memset(chsc_page, 0, PAGE_SIZE);
1294         siosl_area = chsc_page;
1295         siosl_area->request.length = 0x0010;
1296         siosl_area->request.code = 0x0046;
1297         siosl_area->word1 = 0x80000000;
1298         siosl_area->sid = schid;
1299
1300         ccode = chsc(siosl_area);
1301         if (ccode > 0) {
1302                 if (ccode == 3)
1303                         rc = -ENODEV;
1304                 else
1305                         rc = -EBUSY;
1306                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1307                               schid.ssid, schid.sch_no, ccode);
1308                 goto out;
1309         }
1310         rc = chsc_error_from_response(siosl_area->response.code);
1311         if (rc)
1312                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1313                               schid.ssid, schid.sch_no,
1314                               siosl_area->response.code);
1315         else
1316                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1317                               schid.ssid, schid.sch_no);
1318 out:
1319         spin_unlock_irqrestore(&chsc_page_lock, flags);
1320         return rc;
1321 }
1322 EXPORT_SYMBOL_GPL(chsc_siosl);
1323
1324 /**
1325  * chsc_scm_info() - store SCM information (SSI)
1326  * @scm_area: request and response block for SSI
1327  * @token: continuation token
1328  *
1329  * Returns 0 on success.
1330  */
1331 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1332 {
1333         int ccode, ret;
1334
1335         memset(scm_area, 0, sizeof(*scm_area));
1336         scm_area->request.length = 0x0020;
1337         scm_area->request.code = 0x004C;
1338         scm_area->reqtok = token;
1339
1340         ccode = chsc(scm_area);
1341         if (ccode > 0) {
1342                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1343                 goto out;
1344         }
1345         ret = chsc_error_from_response(scm_area->response.code);
1346         if (ret != 0)
1347                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1348                               scm_area->response.code);
1349 out:
1350         return ret;
1351 }
1352 EXPORT_SYMBOL_GPL(chsc_scm_info);
1353
1354 /**
1355  * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info.
1356  * @schid:              id of the subchannel on which PNSO is performed
1357  * @brinfo_area:        request and response block for the operation
1358  * @resume_token:       resume token for multiblock response
1359  * @cnc:                Boolean change-notification control
1360  *
1361  * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1362  *
1363  * Returns 0 on success.
1364  */
1365 int chsc_pnso_brinfo(struct subchannel_id schid,
1366                 struct chsc_pnso_area *brinfo_area,
1367                 struct chsc_brinfo_resume_token resume_token,
1368                 int cnc)
1369 {
1370         memset(brinfo_area, 0, sizeof(*brinfo_area));
1371         brinfo_area->request.length = 0x0030;
1372         brinfo_area->request.code = 0x003d; /* network-subchannel operation */
1373         brinfo_area->m     = schid.m;
1374         brinfo_area->ssid  = schid.ssid;
1375         brinfo_area->sch   = schid.sch_no;
1376         brinfo_area->cssid = schid.cssid;
1377         brinfo_area->oc    = 0; /* Store-network-bridging-information list */
1378         brinfo_area->resume_token = resume_token;
1379         brinfo_area->n     = (cnc != 0);
1380         if (chsc(brinfo_area))
1381                 return -EIO;
1382         return chsc_error_from_response(brinfo_area->response.code);
1383 }
1384 EXPORT_SYMBOL_GPL(chsc_pnso_brinfo);