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 (adlung@de.ibm.com)
   7  *               Cornelia Huck (cornelia.huck@de.ibm.com)
   8  *               Arnd Bergmann (arndb@de.ibm.com)
   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 } __attribute__ ((packed));
  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;
 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 chp_link link;
 456         struct chp_id chpid;
 457         int status;
 458
 459         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 460                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 461         if (sei_area->rs != 4)
 462                 return;
 463         chp_id_init(&chpid);
 464         chpid.id = sei_area->rsid;
 465         /* allocate a new channel path structure, if needed */
 466         status = chp_get_status(chpid);
 467         if (status < 0)
 468                 chp_new(chpid);
 469         else if (!status)
 470                 return;
 471         memset(&link, 0, sizeof(struct chp_link));
 472         link.chpid = chpid;
 473         if ((sei_area->vf & 0xc0) != 0) {
 474                 link.fla = sei_area->fla;
 475                 if ((sei_area->vf & 0xc0) == 0xc0)
 476                         /* full link address */
 477                         link.fla_mask = 0xffff;
 478                 else
 479                         /* link address */
 480                         link.fla_mask = 0xff00;
 481         }
 482         s390_process_res_acc(&link);
 483 }
 484
 485 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 486 {
 487         struct channel_path *chp;
 488         struct chp_id chpid;
 489         u8 *data;
 490         int num;
 491
 492         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 493         if (sei_area->rs != 0)
 494                 return;
 495         data = sei_area->ccdf;
 496         chp_id_init(&chpid);
 497         for (num = 0; num <= __MAX_CHPID; num++) {
 498                 if (!chp_test_bit(data, num))
 499                         continue;
 500                 chpid.id = num;
 501
 502                 CIO_CRW_EVENT(4, "Update information for channel path "
 503                               "%x.%02x\n", chpid.cssid, chpid.id);
 504                 chp = chpid_to_chp(chpid);
 505                 if (!chp) {
 506                         chp_new(chpid);
 507                         continue;
 508                 }
 509                 mutex_lock(&chp->lock);
 510                 chp_update_desc(chp);
 511                 mutex_unlock(&chp->lock);
 512         }
 513 }
 514
 515 struct chp_config_data {
 516         u8 map[32];
 517         u8 op;
 518         u8 pc;
 519 };
 520
 521 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 522 {
 523         struct chp_config_data *data;
 524         struct chp_id chpid;
 525         int num;
 526         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 527
 528         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 529         if (sei_area->rs != 0)
 530                 return;
 531         data = (struct chp_config_data *) &(sei_area->ccdf);
 532         chp_id_init(&chpid);
 533         for (num = 0; num <= __MAX_CHPID; num++) {
 534                 if (!chp_test_bit(data->map, num))
 535                         continue;
 536                 chpid.id = num;
 537                 pr_notice("Processing %s for channel path %x.%02x\n",
 538                           events[data->op], chpid.cssid, chpid.id);
 539                 switch (data->op) {
 540                 case 0:
 541                         chp_cfg_schedule(chpid, 1);
 542                         break;
 543                 case 1:
 544                         chp_cfg_schedule(chpid, 0);
 545                         break;
 546                 case 2:
 547                         chp_cfg_cancel_deconfigure(chpid);
 548                         break;
 549                 }
 550         }
 551 }
 552
 553 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 554 {
 555         int ret;
 556
 557         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 558         if (sei_area->rs != 7)
 559                 return;
 560
 561         ret = scm_update_information();
 562         if (ret)
 563                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 564                               " failed (rc=%d).\n", ret);
 565 }
 566
 567 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 568 {
 569         int ret;
 570
 571         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 572         if (sei_area->rs != 7)
 573                 return;
 574
 575         ret = scm_process_availability_information();
 576         if (ret)
 577                 CIO_CRW_EVENT(0, "chsc: process availability information"
 578                               " failed (rc=%d).\n", ret);
 579 }
 580
 581 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 582 {
 583         switch (sei_area->cc) {
 584         case 1:
 585                 zpci_event_error(sei_area->ccdf);
 586                 break;
 587         case 2:
 588                 zpci_event_availability(sei_area->ccdf);
 589                 break;
 590         default:
 591                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 592                               sei_area->cc);
 593                 break;
 594         }
 595 }
 596
 597 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 598 {
 599         /* which kind of information was stored? */
 600         switch (sei_area->cc) {
 601         case 1: /* link incident*/
 602                 chsc_process_sei_link_incident(sei_area);
 603                 break;
 604         case 2: /* i/o resource accessibility */
 605                 chsc_process_sei_res_acc(sei_area);
 606                 break;
 607         case 7: /* channel-path-availability information */
 608                 chsc_process_sei_chp_avail(sei_area);
 609                 break;
 610         case 8: /* channel-path-configuration notification */
 611                 chsc_process_sei_chp_config(sei_area);
 612                 break;
 613         case 12: /* scm change notification */
 614                 chsc_process_sei_scm_change(sei_area);
 615                 break;
 616         case 14: /* scm available notification */
 617                 chsc_process_sei_scm_avail(sei_area);
 618                 break;
 619         default: /* other stuff */
 620                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 621                               sei_area->cc);
 622                 break;
 623         }
 624
 625         /* Check if we might have lost some information. */
 626         if (sei_area->flags & 0x40) {
 627                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 628                 css_schedule_eval_all();
 629         }
 630 }
 631
 632 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 633 {
 634         static int ntsm_unsupported;
 635
 636         while (true) {
 637                 memset(sei, 0, sizeof(*sei));
 638                 sei->request.length = 0x0010;
 639                 sei->request.code = 0x000e;
 640                 if (!ntsm_unsupported)
 641                         sei->ntsm = ntsm;
 642
 643                 if (chsc(sei))
 644                         break;
 645
 646                 if (sei->response.code != 0x0001) {
 647                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
 648                                       sei->response.code, sei->ntsm);
 649
 650                         if (sei->response.code == 3 && sei->ntsm) {
 651                                 /* Fallback for old firmware. */
 652                                 ntsm_unsupported = 1;
 653                                 continue;
 654                         }
 655                         break;
 656                 }
 657
 658                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 659                 switch (sei->nt) {
 660                 case 0:
 661                         chsc_process_sei_nt0(&sei->u.nt0_area);
 662                         break;
 663                 case 2:
 664                         chsc_process_sei_nt2(&sei->u.nt2_area);
 665                         break;
 666                 default:
 667                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 668                         break;
 669                 }
 670
 671                 if (!(sei->u.nt0_area.flags & 0x80))
 672                         break;
 673         }
 674 }
 675
 676 /*
 677  * Handle channel subsystem related CRWs.
 678  * Use store event information to find out what's going on.
 679  *
 680  * Note: Access to sei_page is serialized through machine check handler
 681  * thread, so no need for locking.
 682  */
 683 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 684 {
 685         struct chsc_sei *sei = sei_page;
 686
 687         if (overflow) {
 688                 css_schedule_eval_all();
 689                 return;
 690         }
 691         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 692                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 693                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 694                       crw0->erc, crw0->rsid);
 695
 696         CIO_TRACE_EVENT(2, "prcss");
 697         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 698 }
 699
 700 void chsc_chp_online(struct chp_id chpid)
 701 {
 702         struct channel_path *chp = chpid_to_chp(chpid);
 703         struct chp_link link;
 704         char dbf_txt[15];
 705
 706         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 707         CIO_TRACE_EVENT(2, dbf_txt);
 708
 709         if (chp_get_status(chpid) != 0) {
 710                 memset(&link, 0, sizeof(struct chp_link));
 711                 link.chpid = chpid;
 712                 /* Wait until previous actions have settled. */
 713                 css_wait_for_slow_path();
 714
 715                 mutex_lock(&chp->lock);
 716                 chp_update_desc(chp);
 717                 mutex_unlock(&chp->lock);
 718
 719                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 720                                            &link);
 721                 css_schedule_reprobe();
 722         }
 723 }
 724
 725 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 726                                          struct chp_id chpid, int on)
 727 {
 728         unsigned long flags;
 729         struct chp_link link;
 730
 731         memset(&link, 0, sizeof(struct chp_link));
 732         link.chpid = chpid;
 733         spin_lock_irqsave(sch->lock, flags);
 734         if (sch->driver && sch->driver->chp_event)
 735                 sch->driver->chp_event(sch, &link,
 736                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 737         spin_unlock_irqrestore(sch->lock, flags);
 738 }
 739
 740 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 741 {
 742         struct chp_id *chpid = data;
 743
 744         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 745         return 0;
 746 }
 747
 748 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 749 {
 750         struct chp_id *chpid = data;
 751
 752         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 753         return 0;
 754 }
 755
 756 /**
 757  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 758  * @chpid: channl-path ID
 759  * @on: non-zero for vary online, zero for vary offline
 760  */
 761 int chsc_chp_vary(struct chp_id chpid, int on)
 762 {
 763         struct channel_path *chp = chpid_to_chp(chpid);
 764
 765         /* Wait until previous actions have settled. */
 766         css_wait_for_slow_path();
 767         /*
 768          * Redo PathVerification on the devices the chpid connects to
 769          */
 770         if (on) {
 771                 /* Try to update the channel path description. */
 772                 chp_update_desc(chp);
 773                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 774                                            NULL, &chpid);
 775                 css_schedule_reprobe();
 776         } else
 777                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 778                                            NULL, &chpid);
 779
 780         return 0;
 781 }
 782
 783 static void
 784 chsc_remove_cmg_attr(struct channel_subsystem *css)
 785 {
 786         int i;
 787
 788         for (i = 0; i <= __MAX_CHPID; i++) {
 789                 if (!css->chps[i])
 790                         continue;
 791                 chp_remove_cmg_attr(css->chps[i]);
 792         }
 793 }
 794
 795 static int
 796 chsc_add_cmg_attr(struct channel_subsystem *css)
 797 {
 798         int i, ret;
 799
 800         ret = 0;
 801         for (i = 0; i <= __MAX_CHPID; i++) {
 802                 if (!css->chps[i])
 803                         continue;
 804                 ret = chp_add_cmg_attr(css->chps[i]);
 805                 if (ret)
 806                         goto cleanup;
 807         }
 808         return ret;
 809 cleanup:
 810         for (--i; i >= 0; i--) {
 811                 if (!css->chps[i])
 812                         continue;
 813                 chp_remove_cmg_attr(css->chps[i]);
 814         }
 815         return ret;
 816 }
 817
 818 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 819 {
 820         struct {
 821                 struct chsc_header request;
 822                 u32 operation_code : 2;
 823                 u32 : 30;
 824                 u32 key : 4;
 825                 u32 : 28;
 826                 u32 zeroes1;
 827                 u32 cub_addr1;
 828                 u32 zeroes2;
 829                 u32 cub_addr2;
 830                 u32 reserved[13];
 831                 struct chsc_header response;
 832                 u32 status : 8;
 833                 u32 : 4;
 834                 u32 fmt : 4;
 835                 u32 : 16;
 836         } __attribute__ ((packed)) *secm_area;
 837         unsigned long flags;
 838         int ret, ccode;
 839
 840         spin_lock_irqsave(&chsc_page_lock, flags);
 841         memset(chsc_page, 0, PAGE_SIZE);
 842         secm_area = chsc_page;
 843         secm_area->request.length = 0x0050;
 844         secm_area->request.code = 0x0016;
 845
 846         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 847         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 848         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 849
 850         secm_area->operation_code = enable ? 0 : 1;
 851
 852         ccode = chsc(secm_area);
 853         if (ccode > 0) {
 854                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 855                 goto out;
 856         }
 857
 858         switch (secm_area->response.code) {
 859         case 0x0102:
 860         case 0x0103:
 861                 ret = -EINVAL;
 862                 break;
 863         default:
 864                 ret = chsc_error_from_response(secm_area->response.code);
 865         }
 866         if (ret != 0)
 867                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 868                               secm_area->response.code);
 869 out:
 870         spin_unlock_irqrestore(&chsc_page_lock, flags);
 871         return ret;
 872 }
 873
 874 int
 875 chsc_secm(struct channel_subsystem *css, int enable)
 876 {
 877         int ret;
 878
 879         if (enable && !css->cm_enabled) {
 880                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 881                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 882                 if (!css->cub_addr1 || !css->cub_addr2) {
 883                         free_page((unsigned long)css->cub_addr1);
 884                         free_page((unsigned long)css->cub_addr2);
 885                         return -ENOMEM;
 886                 }
 887         }
 888         ret = __chsc_do_secm(css, enable);
 889         if (!ret) {
 890                 css->cm_enabled = enable;
 891                 if (css->cm_enabled) {
 892                         ret = chsc_add_cmg_attr(css);
 893                         if (ret) {
 894                                 __chsc_do_secm(css, 0);
 895                                 css->cm_enabled = 0;
 896                         }
 897                 } else
 898                         chsc_remove_cmg_attr(css);
 899         }
 900         if (!css->cm_enabled) {
 901                 free_page((unsigned long)css->cub_addr1);
 902                 free_page((unsigned long)css->cub_addr2);
 903         }
 904         return ret;
 905 }
 906
 907 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 908                                      int c, int m, void *page)
 909 {
 910         struct chsc_scpd *scpd_area;
 911         int ccode, ret;
 912
 913         if ((rfmt == 1 || rfmt == 0) && c == 1 &&
 914             !css_general_characteristics.fcs)
 915                 return -EINVAL;
 916         if ((rfmt == 2) && !css_general_characteristics.cib)
 917                 return -EINVAL;
 918
 919         memset(page, 0, PAGE_SIZE);
 920         scpd_area = page;
 921         scpd_area->request.length = 0x0010;
 922         scpd_area->request.code = 0x0002;
 923         scpd_area->cssid = chpid.cssid;
 924         scpd_area->first_chpid = chpid.id;
 925         scpd_area->last_chpid = chpid.id;
 926         scpd_area->m = m;
 927         scpd_area->c = c;
 928         scpd_area->fmt = fmt;
 929         scpd_area->rfmt = rfmt;
 930
 931         ccode = chsc(scpd_area);
 932         if (ccode > 0)
 933                 return (ccode == 3) ? -ENODEV : -EBUSY;
 934
 935         ret = chsc_error_from_response(scpd_area->response.code);
 936         if (ret)
 937                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 938                               scpd_area->response.code);
 939         return ret;
 940 }
 941 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 942
 943 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 944                                           struct channel_path_desc *desc)
 945 {
 946         struct chsc_scpd *scpd_area;
 947         unsigned long flags;
 948         int ret;
 949
 950         spin_lock_irqsave(&chsc_page_lock, flags);
 951         scpd_area = chsc_page;
 952         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 953         if (ret)
 954                 goto out;
 955
 956         memcpy(desc, scpd_area->data, sizeof(*desc));
 957 out:
 958         spin_unlock_irqrestore(&chsc_page_lock, flags);
 959         return ret;
 960 }
 961
 962 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 963                                           struct channel_path_desc_fmt1 *desc)
 964 {
 965         struct chsc_scpd *scpd_area;
 966         unsigned long flags;
 967         int ret;
 968
 969         spin_lock_irqsave(&chsc_page_lock, flags);
 970         scpd_area = chsc_page;
 971         ret = chsc_determine_channel_path_desc(chpid, 0, 1, 1, 0, scpd_area);
 972         if (ret)
 973                 goto out;
 974
 975         memcpy(desc, scpd_area->data, sizeof(*desc));
 976 out:
 977         spin_unlock_irqrestore(&chsc_page_lock, flags);
 978         return ret;
 979 }
 980
 981 static void
 982 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 983                           struct cmg_chars *chars)
 984 {
 985         int i, mask;
 986
 987         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 988                 mask = 0x80 >> (i + 3);
 989                 if (cmcv & mask)
 990                         chp->cmg_chars.values[i] = chars->values[i];
 991                 else
 992                         chp->cmg_chars.values[i] = 0;
 993         }
 994 }
 995
 996 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 997 {
 998         unsigned long flags;
 999         int ccode, ret;
1000
1001         struct {
1002                 struct chsc_header request;
1003                 u32 : 24;
1004                 u32 first_chpid : 8;
1005                 u32 : 24;
1006                 u32 last_chpid : 8;
1007                 u32 zeroes1;
1008                 struct chsc_header response;
1009                 u32 zeroes2;
1010                 u32 not_valid : 1;
1011                 u32 shared : 1;
1012                 u32 : 22;
1013                 u32 chpid : 8;
1014                 u32 cmcv : 5;
1015                 u32 : 11;
1016                 u32 cmgq : 8;
1017                 u32 cmg : 8;
1018                 u32 zeroes3;
1019                 u32 data[NR_MEASUREMENT_CHARS];
1020         } __attribute__ ((packed)) *scmc_area;
1021
1022         chp->shared = -1;
1023         chp->cmg = -1;
1024
1025         if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1026                 return -EINVAL;
1027
1028         spin_lock_irqsave(&chsc_page_lock, flags);
1029         memset(chsc_page, 0, PAGE_SIZE);
1030         scmc_area = chsc_page;
1031         scmc_area->request.length = 0x0010;
1032         scmc_area->request.code = 0x0022;
1033         scmc_area->first_chpid = chp->chpid.id;
1034         scmc_area->last_chpid = chp->chpid.id;
1035
1036         ccode = chsc(scmc_area);
1037         if (ccode > 0) {
1038                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1039                 goto out;
1040         }
1041
1042         ret = chsc_error_from_response(scmc_area->response.code);
1043         if (ret) {
1044                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1045                               scmc_area->response.code);
1046                 goto out;
1047         }
1048         if (scmc_area->not_valid)
1049                 goto out;
1050
1051         chp->cmg = scmc_area->cmg;
1052         chp->shared = scmc_area->shared;
1053         if (chp->cmg != 2 && chp->cmg != 3) {
1054                 /* No cmg-dependent data. */
1055                 goto out;
1056         }
1057         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1058                                   (struct cmg_chars *) &scmc_area->data);
1059 out:
1060         spin_unlock_irqrestore(&chsc_page_lock, flags);
1061         return ret;
1062 }
1063
1064 int __init chsc_init(void)
1065 {
1066         int ret;
1067
1068         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1069         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1070         if (!sei_page || !chsc_page) {
1071                 ret = -ENOMEM;
1072                 goto out_err;
1073         }
1074         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1075         if (ret)
1076                 goto out_err;
1077         return ret;
1078 out_err:
1079         free_page((unsigned long)chsc_page);
1080         free_page((unsigned long)sei_page);
1081         return ret;
1082 }
1083
1084 void __init chsc_init_cleanup(void)
1085 {
1086         crw_unregister_handler(CRW_RSC_CSS);
1087         free_page((unsigned long)chsc_page);
1088         free_page((unsigned long)sei_page);
1089 }
1090
1091 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1092 {
1093         int ret;
1094
1095         sda_area->request.length = 0x0400;
1096         sda_area->request.code = 0x0031;
1097         sda_area->operation_code = operation_code;
1098
1099         ret = chsc(sda_area);
1100         if (ret > 0) {
1101                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1102                 goto out;
1103         }
1104
1105         switch (sda_area->response.code) {
1106         case 0x0101:
1107                 ret = -EOPNOTSUPP;
1108                 break;
1109         default:
1110                 ret = chsc_error_from_response(sda_area->response.code);
1111         }
1112 out:
1113         return ret;
1114 }
1115
1116 int chsc_enable_facility(int operation_code)
1117 {
1118         struct chsc_sda_area *sda_area;
1119         unsigned long flags;
1120         int ret;
1121
1122         spin_lock_irqsave(&chsc_page_lock, flags);
1123         memset(chsc_page, 0, PAGE_SIZE);
1124         sda_area = chsc_page;
1125
1126         ret = __chsc_enable_facility(sda_area, operation_code);
1127         if (ret != 0)
1128                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1129                               operation_code, sda_area->response.code);
1130
1131         spin_unlock_irqrestore(&chsc_page_lock, flags);
1132         return ret;
1133 }
1134
1135 int __init chsc_get_cssid(int idx)
1136 {
1137         struct {
1138                 struct chsc_header request;
1139                 u8 atype;
1140                 u32 : 24;
1141                 u32 reserved1[6];
1142                 struct chsc_header response;
1143                 u32 reserved2[3];
1144                 struct {
1145                         u8 cssid;
1146                         u32 : 24;
1147                 } list[0];
1148         } __packed *sdcal_area;
1149         int ret;
1150
1151         spin_lock_irq(&chsc_page_lock);
1152         memset(chsc_page, 0, PAGE_SIZE);
1153         sdcal_area = chsc_page;
1154         sdcal_area->request.length = 0x0020;
1155         sdcal_area->request.code = 0x0034;
1156         sdcal_area->atype = 4;
1157
1158         ret = chsc(sdcal_area);
1159         if (ret) {
1160                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1161                 goto exit;
1162         }
1163
1164         ret = chsc_error_from_response(sdcal_area->response.code);
1165         if (ret) {
1166                 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
1167                               sdcal_area->response.code);
1168                 goto exit;
1169         }
1170
1171         if ((addr_t) &sdcal_area->list[idx] <
1172             (addr_t) &sdcal_area->response + sdcal_area->response.length)
1173                 ret = sdcal_area->list[idx].cssid;
1174         else
1175                 ret = -ENODEV;
1176 exit:
1177         spin_unlock_irq(&chsc_page_lock);
1178         return ret;
1179 }
1180
1181 struct css_general_char css_general_characteristics;
1182 struct css_chsc_char css_chsc_characteristics;
1183
1184 int __init
1185 chsc_determine_css_characteristics(void)
1186 {
1187         unsigned long flags;
1188         int result;
1189         struct {
1190                 struct chsc_header request;
1191                 u32 reserved1;
1192                 u32 reserved2;
1193                 u32 reserved3;
1194                 struct chsc_header response;
1195                 u32 reserved4;
1196                 u32 general_char[510];
1197                 u32 chsc_char[508];
1198         } __attribute__ ((packed)) *scsc_area;
1199
1200         spin_lock_irqsave(&chsc_page_lock, flags);
1201         memset(chsc_page, 0, PAGE_SIZE);
1202         scsc_area = chsc_page;
1203         scsc_area->request.length = 0x0010;
1204         scsc_area->request.code = 0x0010;
1205
1206         result = chsc(scsc_area);
1207         if (result) {
1208                 result = (result == 3) ? -ENODEV : -EBUSY;
1209                 goto exit;
1210         }
1211
1212         result = chsc_error_from_response(scsc_area->response.code);
1213         if (result == 0) {
1214                 memcpy(&css_general_characteristics, scsc_area->general_char,
1215                        sizeof(css_general_characteristics));
1216                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1217                        sizeof(css_chsc_characteristics));
1218         } else
1219                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1220                               scsc_area->response.code);
1221 exit:
1222         spin_unlock_irqrestore(&chsc_page_lock, flags);
1223         return result;
1224 }
1225
1226 EXPORT_SYMBOL_GPL(css_general_characteristics);
1227 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1228
1229 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta)
1230 {
1231         struct {
1232                 struct chsc_header request;
1233                 unsigned int rsvd0;
1234                 unsigned int op : 8;
1235                 unsigned int rsvd1 : 8;
1236                 unsigned int ctrl : 16;
1237                 unsigned int rsvd2[5];
1238                 struct chsc_header response;
1239                 unsigned int rsvd3[3];
1240                 u64 clock_delta;
1241                 unsigned int rsvd4[2];
1242         } __attribute__ ((packed)) *rr;
1243         int rc;
1244
1245         memset(page, 0, PAGE_SIZE);
1246         rr = page;
1247         rr->request.length = 0x0020;
1248         rr->request.code = 0x0033;
1249         rr->op = op;
1250         rr->ctrl = ctrl;
1251         rc = chsc(rr);
1252         if (rc)
1253                 return -EIO;
1254         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1255         if (clock_delta)
1256                 *clock_delta = rr->clock_delta;
1257         return rc;
1258 }
1259
1260 int chsc_sstpi(void *page, void *result, size_t size)
1261 {
1262         struct {
1263                 struct chsc_header request;
1264                 unsigned int rsvd0[3];
1265                 struct chsc_header response;
1266                 char data[];
1267         } __attribute__ ((packed)) *rr;
1268         int rc;
1269
1270         memset(page, 0, PAGE_SIZE);
1271         rr = page;
1272         rr->request.length = 0x0010;
1273         rr->request.code = 0x0038;
1274         rc = chsc(rr);
1275         if (rc)
1276                 return -EIO;
1277         memcpy(result, &rr->data, size);
1278         return (rr->response.code == 0x0001) ? 0 : -EIO;
1279 }
1280
1281 int chsc_siosl(struct subchannel_id schid)
1282 {
1283         struct {
1284                 struct chsc_header request;
1285                 u32 word1;
1286                 struct subchannel_id sid;
1287                 u32 word3;
1288                 struct chsc_header response;
1289                 u32 word[11];
1290         } __attribute__ ((packed)) *siosl_area;
1291         unsigned long flags;
1292         int ccode;
1293         int rc;
1294
1295         spin_lock_irqsave(&chsc_page_lock, flags);
1296         memset(chsc_page, 0, PAGE_SIZE);
1297         siosl_area = chsc_page;
1298         siosl_area->request.length = 0x0010;
1299         siosl_area->request.code = 0x0046;
1300         siosl_area->word1 = 0x80000000;
1301         siosl_area->sid = schid;
1302
1303         ccode = chsc(siosl_area);
1304         if (ccode > 0) {
1305                 if (ccode == 3)
1306                         rc = -ENODEV;
1307                 else
1308                         rc = -EBUSY;
1309                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1310                               schid.ssid, schid.sch_no, ccode);
1311                 goto out;
1312         }
1313         rc = chsc_error_from_response(siosl_area->response.code);
1314         if (rc)
1315                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1316                               schid.ssid, schid.sch_no,
1317                               siosl_area->response.code);
1318         else
1319                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1320                               schid.ssid, schid.sch_no);
1321 out:
1322         spin_unlock_irqrestore(&chsc_page_lock, flags);
1323         return rc;
1324 }
1325 EXPORT_SYMBOL_GPL(chsc_siosl);
1326
1327 /**
1328  * chsc_scm_info() - store SCM information (SSI)
1329  * @scm_area: request and response block for SSI
1330  * @token: continuation token
1331  *
1332  * Returns 0 on success.
1333  */
1334 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1335 {
1336         int ccode, ret;
1337
1338         memset(scm_area, 0, sizeof(*scm_area));
1339         scm_area->request.length = 0x0020;
1340         scm_area->request.code = 0x004C;
1341         scm_area->reqtok = token;
1342
1343         ccode = chsc(scm_area);
1344         if (ccode > 0) {
1345                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1346                 goto out;
1347         }
1348         ret = chsc_error_from_response(scm_area->response.code);
1349         if (ret != 0)
1350                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1351                               scm_area->response.code);
1352 out:
1353         return ret;
1354 }
1355 EXPORT_SYMBOL_GPL(chsc_scm_info);
1356
1357 /**
1358  * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info.
1359  * @schid:              id of the subchannel on which PNSO is performed
1360  * @brinfo_area:        request and response block for the operation
1361  * @resume_token:       resume token for multiblock response
1362  * @cnc:                Boolean change-notification control
1363  *
1364  * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1365  *
1366  * Returns 0 on success.
1367  */
1368 int chsc_pnso_brinfo(struct subchannel_id schid,
1369                 struct chsc_pnso_area *brinfo_area,
1370                 struct chsc_brinfo_resume_token resume_token,
1371                 int cnc)
1372 {
1373         memset(brinfo_area, 0, sizeof(*brinfo_area));
1374         brinfo_area->request.length = 0x0030;
1375         brinfo_area->request.code = 0x003d; /* network-subchannel operation */
1376         brinfo_area->m     = schid.m;
1377         brinfo_area->ssid  = schid.ssid;
1378         brinfo_area->sch   = schid.sch_no;
1379         brinfo_area->cssid = schid.cssid;
1380         brinfo_area->oc    = 0; /* Store-network-bridging-information list */
1381         brinfo_area->resume_token = resume_token;
1382         brinfo_area->n     = (cnc != 0);
1383         if (chsc(brinfo_area))
1384                 return -EIO;
1385         return chsc_error_from_response(brinfo_area->response.code);
1386 }
1387 EXPORT_SYMBOL_GPL(chsc_pnso_brinfo);