drivers/s390/cio/chsc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *   S/390 common I/O routines -- channel subsystem call
   4  *
   5  *    Copyright IBM Corp. 1999,2012
   6  *    Author(s): Ingo Adlung ([email protected])
   7  *               Cornelia Huck ([email protected])
   8  *               Arnd Bergmann ([email protected])
   9  */
  10
  11 #define KMSG_COMPONENT "cio"
  12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/init.h>
  17 #include <linux/device.h>
  18 #include <linux/mutex.h>
  19 #include <linux/pci.h>
  20
  21 #include <asm/cio.h>
  22 #include <asm/chpid.h>
  23 #include <asm/chsc.h>
  24 #include <asm/crw.h>
  25 #include <asm/isc.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/ap.h>
  28
  29 #include "css.h"
  30 #include "cio.h"
  31 #include "cio_debug.h"
  32 #include "ioasm.h"
  33 #include "chp.h"
  34 #include "chsc.h"
  35
  36 static void *sei_page;
  37 static void *chsc_page;
  38 static DEFINE_SPINLOCK(chsc_page_lock);
  39
  40 /**
  41  * chsc_error_from_response() - convert a chsc response to an error
  42  * @response: chsc response code
  43  *
  44  * Returns an appropriate Linux error code for @response.
  45  */
  46 int chsc_error_from_response(int response)
  47 {
  48         switch (response) {
  49         case 0x0001:
  50                 return 0;
  51         case 0x0002:
  52         case 0x0003:
  53         case 0x0006:
  54         case 0x0007:
  55         case 0x0008:
  56         case 0x000a:
  57         case 0x0104:
  58                 return -EINVAL;
  59         case 0x0004:
  60         case 0x0106:            /* "Wrong Channel Parm" for the op 0x003d */
  61                 return -EOPNOTSUPP;
  62         case 0x000b:
  63         case 0x0107:            /* "Channel busy" for the op 0x003d */
  64                 return -EBUSY;
  65         case 0x0100:
  66         case 0x0102:
  67                 return -ENOMEM;
  68         default:
  69                 return -EIO;
  70         }
  71 }
  72 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  73
  74 struct chsc_ssd_area {
  75         struct chsc_header request;
  76         u16 :10;
  77         u16 ssid:2;
  78         u16 :4;
  79         u16 f_sch;        /* first subchannel */
  80         u16 :16;
  81         u16 l_sch;        /* last subchannel */
  82         u32 :32;
  83         struct chsc_header response;
  84         u32 :32;
  85         u8 sch_valid : 1;
  86         u8 dev_valid : 1;
  87         u8 st        : 3; /* subchannel type */
  88         u8 zeroes    : 3;
  89         u8  unit_addr;    /* unit address */
  90         u16 devno;        /* device number */
  91         u8 path_mask;
  92         u8 fla_valid_mask;
  93         u16 sch;          /* subchannel */
  94         u8 chpid[8];      /* chpids 0-7 */
  95         u16 fla[8];       /* full link addresses 0-7 */
  96 } __packed __aligned(PAGE_SIZE);
  97
  98 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  99 {
 100         struct chsc_ssd_area *ssd_area;
 101         unsigned long flags;
 102         int ccode;
 103         int ret;
 104         int i;
 105         int mask;
 106
 107         spin_lock_irqsave(&chsc_page_lock, flags);
 108         memset(chsc_page, 0, PAGE_SIZE);
 109         ssd_area = chsc_page;
 110         ssd_area->request.length = 0x0010;
 111         ssd_area->request.code = 0x0004;
 112         ssd_area->ssid = schid.ssid;
 113         ssd_area->f_sch = schid.sch_no;
 114         ssd_area->l_sch = schid.sch_no;
 115
 116         ccode = chsc(ssd_area);
 117         /* Check response. */
 118         if (ccode > 0) {
 119                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 120                 goto out;
 121         }
 122         ret = chsc_error_from_response(ssd_area->response.code);
 123         if (ret != 0) {
 124                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 125                               schid.ssid, schid.sch_no,
 126                               ssd_area->response.code);
 127                 goto out;
 128         }
 129         if (!ssd_area->sch_valid) {
 130                 ret = -ENODEV;
 131                 goto out;
 132         }
 133         /* Copy data */
 134         ret = 0;
 135         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 136         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 137             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 138                 goto out;
 139         ssd->path_mask = ssd_area->path_mask;
 140         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 141         for (i = 0; i < 8; i++) {
 142                 mask = 0x80 >> i;
 143                 if (ssd_area->path_mask & mask) {
 144                         chp_id_init(&ssd->chpid[i]);
 145                         ssd->chpid[i].id = ssd_area->chpid[i];
 146                 }
 147                 if (ssd_area->fla_valid_mask & mask)
 148                         ssd->fla[i] = ssd_area->fla[i];
 149         }
 150 out:
 151         spin_unlock_irqrestore(&chsc_page_lock, flags);
 152         return ret;
 153 }
 154
 155 /**
 156  * chsc_ssqd() - store subchannel QDIO data (SSQD)
 157  * @schid: id of the subchannel on which SSQD is performed
 158  * @ssqd: request and response block for SSQD
 159  *
 160  * Returns 0 on success.
 161  */
 162 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 163 {
 164         memset(ssqd, 0, sizeof(*ssqd));
 165         ssqd->request.length = 0x0010;
 166         ssqd->request.code = 0x0024;
 167         ssqd->first_sch = schid.sch_no;
 168         ssqd->last_sch = schid.sch_no;
 169         ssqd->ssid = schid.ssid;
 170
 171         if (chsc(ssqd))
 172                 return -EIO;
 173
 174         return chsc_error_from_response(ssqd->response.code);
 175 }
 176 EXPORT_SYMBOL_GPL(chsc_ssqd);
 177
 178 /**
 179  * chsc_sadc() - set adapter device controls (SADC)
 180  * @schid: id of the subchannel on which SADC is performed
 181  * @scssc: request and response block for SADC
 182  * @summary_indicator_addr: summary indicator address
 183  * @subchannel_indicator_addr: subchannel indicator address
 184  * @isc: Interruption Subclass for this subchannel
 185  *
 186  * Returns 0 on success.
 187  */
 188 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
 189               u64 summary_indicator_addr, u64 subchannel_indicator_addr, u8 isc)
 190 {
 191         memset(scssc, 0, sizeof(*scssc));
 192         scssc->request.length = 0x0fe0;
 193         scssc->request.code = 0x0021;
 194         scssc->operation_code = 0;
 195
 196         scssc->summary_indicator_addr = summary_indicator_addr;
 197         scssc->subchannel_indicator_addr = subchannel_indicator_addr;
 198
 199         scssc->ks = PAGE_DEFAULT_KEY >> 4;
 200         scssc->kc = PAGE_DEFAULT_KEY >> 4;
 201         scssc->isc = isc;
 202         scssc->schid = schid;
 203
 204         /* enable the time delay disablement facility */
 205         if (css_general_characteristics.aif_tdd)
 206                 scssc->word_with_d_bit = 0x10000000;
 207
 208         if (chsc(scssc))
 209                 return -EIO;
 210
 211         return chsc_error_from_response(scssc->response.code);
 212 }
 213 EXPORT_SYMBOL_GPL(chsc_sadc);
 214
 215 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 216 {
 217         spin_lock_irq(sch->lock);
 218         if (sch->driver && sch->driver->chp_event)
 219                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 220                         goto out_unreg;
 221         spin_unlock_irq(sch->lock);
 222         return 0;
 223
 224 out_unreg:
 225         sch->lpm = 0;
 226         spin_unlock_irq(sch->lock);
 227         css_schedule_eval(sch->schid);
 228         return 0;
 229 }
 230
 231 void chsc_chp_offline(struct chp_id chpid)
 232 {
 233         struct channel_path *chp = chpid_to_chp(chpid);
 234         struct chp_link link;
 235         char dbf_txt[15];
 236
 237         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 238         CIO_TRACE_EVENT(2, dbf_txt);
 239
 240         if (chp_get_status(chpid) <= 0)
 241                 return;
 242         memset(&link, 0, sizeof(struct chp_link));
 243         link.chpid = chpid;
 244         /* Wait until previous actions have settled. */
 245         css_wait_for_slow_path();
 246
 247         mutex_lock(&chp->lock);
 248         chp_update_desc(chp);
 249         mutex_unlock(&chp->lock);
 250
 251         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 252 }
 253
 254 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 255 {
 256         spin_lock_irq(sch->lock);
 257         if (sch->driver && sch->driver->chp_event)
 258                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 259         spin_unlock_irq(sch->lock);
 260
 261         return 0;
 262 }
 263
 264 static void s390_process_res_acc(struct chp_link *link)
 265 {
 266         char dbf_txt[15];
 267
 268         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 269                 link->chpid.id);
 270         CIO_TRACE_EVENT( 2, dbf_txt);
 271         if (link->fla != 0) {
 272                 sprintf(dbf_txt, "fla%x", link->fla);
 273                 CIO_TRACE_EVENT( 2, dbf_txt);
 274         }
 275         /* Wait until previous actions have settled. */
 276         css_wait_for_slow_path();
 277         /*
 278          * I/O resources may have become accessible.
 279          * Scan through all subchannels that may be concerned and
 280          * do a validation on those.
 281          * The more information we have (info), the less scanning
 282          * will we have to do.
 283          */
 284         for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
 285         css_schedule_reprobe();
 286 }
 287
 288 struct chsc_sei_nt0_area {
 289         u8  flags;
 290         u8  vf;                         /* validity flags */
 291         u8  rs;                         /* reporting source */
 292         u8  cc;                         /* content code */
 293         u16 fla;                        /* full link address */
 294         u16 rsid;                       /* reporting source id */
 295         u32 reserved1;
 296         u32 reserved2;
 297         /* ccdf has to be big enough for a link-incident record */
 298         u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 299 } __packed;
 300
 301 struct chsc_sei_nt2_area {
 302         u8  flags;                      /* p and v bit */
 303         u8  reserved1;
 304         u8  reserved2;
 305         u8  cc;                         /* content code */
 306         u32 reserved3[13];
 307         u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 308 } __packed;
 309
 310 #define CHSC_SEI_NT0    (1ULL << 63)
 311 #define CHSC_SEI_NT2    (1ULL << 61)
 312
 313 struct chsc_sei {
 314         struct chsc_header request;
 315         u32 reserved1;
 316         u64 ntsm;                       /* notification type mask */
 317         struct chsc_header response;
 318         u32 :24;
 319         u8 nt;
 320         union {
 321                 struct chsc_sei_nt0_area nt0_area;
 322                 struct chsc_sei_nt2_area nt2_area;
 323                 u8 nt_area[PAGE_SIZE - 24];
 324         } u;
 325 } __packed __aligned(PAGE_SIZE);
 326
 327 /*
 328  * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
 329  */
 330
 331 #define LIR_IQ_CLASS_INFO               0
 332 #define LIR_IQ_CLASS_DEGRADED           1
 333 #define LIR_IQ_CLASS_NOT_OPERATIONAL    2
 334
 335 struct lir {
 336         struct {
 337                 u32 null:1;
 338                 u32 reserved:3;
 339                 u32 class:2;
 340                 u32 reserved2:2;
 341         } __packed iq;
 342         u32 ic:8;
 343         u32 reserved:16;
 344         struct node_descriptor incident_node;
 345         struct node_descriptor attached_node;
 346         u8 reserved2[32];
 347 } __packed;
 348
 349 #define PARAMS_LEN      10      /* PARAMS=xx,xxxxxx */
 350 #define NODEID_LEN      35      /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 351
 352 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
 353 static char *store_ebcdic(char *dest, const char *src, unsigned long len,
 354                           char delim)
 355 {
 356         memcpy(dest, src, len);
 357         EBCASC(dest, len);
 358
 359         if (delim)
 360                 dest[len++] = delim;
 361
 362         return dest + len;
 363 }
 364
 365 /* Format node ID and parameters for output in LIR log message. */
 366 static void format_node_data(char *params, char *id, struct node_descriptor *nd)
 367 {
 368         memset(params, 0, PARAMS_LEN);
 369         memset(id, 0, NODEID_LEN);
 370
 371         if (nd->validity != ND_VALIDITY_VALID) {
 372                 strncpy(params, "n/a", PARAMS_LEN - 1);
 373                 strncpy(id, "n/a", NODEID_LEN - 1);
 374                 return;
 375         }
 376
 377         /* PARAMS=xx,xxxxxx */
 378         snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
 379         /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 380         id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
 381         id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
 382         id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
 383         id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
 384         id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
 385         sprintf(id, "%04X", nd->tag);
 386 }
 387
 388 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 389 {
 390         struct lir *lir = (struct lir *) &sei_area->ccdf;
 391         char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
 392              aunodeid[NODEID_LEN];
 393
 394         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
 395                       sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
 396
 397         /* Ignore NULL Link Incident Records. */
 398         if (lir->iq.null)
 399                 return;
 400
 401         /* Inform user that a link requires maintenance actions because it has
 402          * become degraded or not operational. Note that this log message is
 403          * the primary intention behind a Link Incident Record. */
 404
 405         format_node_data(iuparams, iunodeid, &lir->incident_node);
 406         format_node_data(auparams, aunodeid, &lir->attached_node);
 407
 408         switch (lir->iq.class) {
 409         case LIR_IQ_CLASS_DEGRADED:
 410                 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
 411                         "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 412                         sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 413                         iunodeid, auparams, aunodeid);
 414                 break;
 415         case LIR_IQ_CLASS_NOT_OPERATIONAL:
 416                 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
 417                        "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 418                        sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 419                        iunodeid, auparams, aunodeid);
 420                 break;
 421         default:
 422                 break;
 423         }
 424 }
 425
 426 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 427 {
 428         struct channel_path *chp;
 429         struct chp_link link;
 430         struct chp_id chpid;
 431         int status;
 432
 433         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 434                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 435         if (sei_area->rs != 4)
 436                 return;
 437         chp_id_init(&chpid);
 438         chpid.id = sei_area->rsid;
 439         /* allocate a new channel path structure, if needed */
 440         status = chp_get_status(chpid);
 441         if (!status)
 442                 return;
 443
 444         if (status < 0) {
 445                 chp_new(chpid);
 446         } else {
 447                 chp = chpid_to_chp(chpid);
 448                 mutex_lock(&chp->lock);
 449                 chp_update_desc(chp);
 450                 mutex_unlock(&chp->lock);
 451         }
 452         memset(&link, 0, sizeof(struct chp_link));
 453         link.chpid = chpid;
 454         if ((sei_area->vf & 0xc0) != 0) {
 455                 link.fla = sei_area->fla;
 456                 if ((sei_area->vf & 0xc0) == 0xc0)
 457                         /* full link address */
 458                         link.fla_mask = 0xffff;
 459                 else
 460                         /* link address */
 461                         link.fla_mask = 0xff00;
 462         }
 463         s390_process_res_acc(&link);
 464 }
 465
 466 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 467 {
 468         struct channel_path *chp;
 469         struct chp_id chpid;
 470         u8 *data;
 471         int num;
 472
 473         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 474         if (sei_area->rs != 0)
 475                 return;
 476         data = sei_area->ccdf;
 477         chp_id_init(&chpid);
 478         for (num = 0; num <= __MAX_CHPID; num++) {
 479                 if (!chp_test_bit(data, num))
 480                         continue;
 481                 chpid.id = num;
 482
 483                 CIO_CRW_EVENT(4, "Update information for channel path "
 484                               "%x.%02x\n", chpid.cssid, chpid.id);
 485                 chp = chpid_to_chp(chpid);
 486                 if (!chp) {
 487                         chp_new(chpid);
 488                         continue;
 489                 }
 490                 mutex_lock(&chp->lock);
 491                 chp_update_desc(chp);
 492                 mutex_unlock(&chp->lock);
 493         }
 494 }
 495
 496 struct chp_config_data {
 497         u8 map[32];
 498         u8 op;
 499         u8 pc;
 500 };
 501
 502 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 503 {
 504         struct chp_config_data *data;
 505         struct chp_id chpid;
 506         int num;
 507         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 508
 509         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 510         if (sei_area->rs != 0)
 511                 return;
 512         data = (struct chp_config_data *) &(sei_area->ccdf);
 513         chp_id_init(&chpid);
 514         for (num = 0; num <= __MAX_CHPID; num++) {
 515                 if (!chp_test_bit(data->map, num))
 516                         continue;
 517                 chpid.id = num;
 518                 pr_notice("Processing %s for channel path %x.%02x\n",
 519                           events[data->op], chpid.cssid, chpid.id);
 520                 switch (data->op) {
 521                 case 0:
 522                         chp_cfg_schedule(chpid, 1);
 523                         break;
 524                 case 1:
 525                         chp_cfg_schedule(chpid, 0);
 526                         break;
 527                 case 2:
 528                         chp_cfg_cancel_deconfigure(chpid);
 529                         break;
 530                 }
 531         }
 532 }
 533
 534 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 535 {
 536         int ret;
 537
 538         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 539         if (sei_area->rs != 7)
 540                 return;
 541
 542         ret = scm_update_information();
 543         if (ret)
 544                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 545                               " failed (rc=%d).\n", ret);
 546 }
 547
 548 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 549 {
 550         int ret;
 551
 552         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 553         if (sei_area->rs != 7)
 554                 return;
 555
 556         ret = scm_process_availability_information();
 557         if (ret)
 558                 CIO_CRW_EVENT(0, "chsc: process availability information"
 559                               " failed (rc=%d).\n", ret);
 560 }
 561
 562 static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
 563 {
 564         CIO_CRW_EVENT(3, "chsc: ap config changed\n");
 565         if (sei_area->rs != 5)
 566                 return;
 567
 568         ap_bus_cfg_chg();
 569 }
 570
 571 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 572 {
 573         switch (sei_area->cc) {
 574         case 1:
 575                 zpci_event_error(sei_area->ccdf);
 576                 break;
 577         case 2:
 578                 zpci_event_availability(sei_area->ccdf);
 579                 break;
 580         default:
 581                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 582                               sei_area->cc);
 583                 break;
 584         }
 585 }
 586
 587 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 588 {
 589         /* which kind of information was stored? */
 590         switch (sei_area->cc) {
 591         case 1: /* link incident*/
 592                 chsc_process_sei_link_incident(sei_area);
 593                 break;
 594         case 2: /* i/o resource accessibility */
 595                 chsc_process_sei_res_acc(sei_area);
 596                 break;
 597         case 3: /* ap config changed */
 598                 chsc_process_sei_ap_cfg_chg(sei_area);
 599                 break;
 600         case 7: /* channel-path-availability information */
 601                 chsc_process_sei_chp_avail(sei_area);
 602                 break;
 603         case 8: /* channel-path-configuration notification */
 604                 chsc_process_sei_chp_config(sei_area);
 605                 break;
 606         case 12: /* scm change notification */
 607                 chsc_process_sei_scm_change(sei_area);
 608                 break;
 609         case 14: /* scm available notification */
 610                 chsc_process_sei_scm_avail(sei_area);
 611                 break;
 612         default: /* other stuff */
 613                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 614                               sei_area->cc);
 615                 break;
 616         }
 617
 618         /* Check if we might have lost some information. */
 619         if (sei_area->flags & 0x40) {
 620                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 621                 css_schedule_eval_all();
 622         }
 623 }
 624
 625 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 626 {
 627         static int ntsm_unsupported;
 628
 629         while (true) {
 630                 memset(sei, 0, sizeof(*sei));
 631                 sei->request.length = 0x0010;
 632                 sei->request.code = 0x000e;
 633                 if (!ntsm_unsupported)
 634                         sei->ntsm = ntsm;
 635
 636                 if (chsc(sei))
 637                         break;
 638
 639                 if (sei->response.code != 0x0001) {
 640                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
 641                                       sei->response.code, sei->ntsm);
 642
 643                         if (sei->response.code == 3 && sei->ntsm) {
 644                                 /* Fallback for old firmware. */
 645                                 ntsm_unsupported = 1;
 646                                 continue;
 647                         }
 648                         break;
 649                 }
 650
 651                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 652                 switch (sei->nt) {
 653                 case 0:
 654                         chsc_process_sei_nt0(&sei->u.nt0_area);
 655                         break;
 656                 case 2:
 657                         chsc_process_sei_nt2(&sei->u.nt2_area);
 658                         break;
 659                 default:
 660                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 661                         break;
 662                 }
 663
 664                 if (!(sei->u.nt0_area.flags & 0x80))
 665                         break;
 666         }
 667 }
 668
 669 /*
 670  * Handle channel subsystem related CRWs.
 671  * Use store event information to find out what's going on.
 672  *
 673  * Note: Access to sei_page is serialized through machine check handler
 674  * thread, so no need for locking.
 675  */
 676 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 677 {
 678         struct chsc_sei *sei = sei_page;
 679
 680         if (overflow) {
 681                 css_schedule_eval_all();
 682                 return;
 683         }
 684         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 685                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 686                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 687                       crw0->erc, crw0->rsid);
 688
 689         CIO_TRACE_EVENT(2, "prcss");
 690         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 691 }
 692
 693 void chsc_chp_online(struct chp_id chpid)
 694 {
 695         struct channel_path *chp = chpid_to_chp(chpid);
 696         struct chp_link link;
 697         char dbf_txt[15];
 698
 699         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 700         CIO_TRACE_EVENT(2, dbf_txt);
 701
 702         if (chp_get_status(chpid) != 0) {
 703                 memset(&link, 0, sizeof(struct chp_link));
 704                 link.chpid = chpid;
 705                 /* Wait until previous actions have settled. */
 706                 css_wait_for_slow_path();
 707
 708                 mutex_lock(&chp->lock);
 709                 chp_update_desc(chp);
 710                 mutex_unlock(&chp->lock);
 711
 712                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 713                                            &link);
 714                 css_schedule_reprobe();
 715         }
 716 }
 717
 718 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 719                                          struct chp_id chpid, int on)
 720 {
 721         unsigned long flags;
 722         struct chp_link link;
 723
 724         memset(&link, 0, sizeof(struct chp_link));
 725         link.chpid = chpid;
 726         spin_lock_irqsave(sch->lock, flags);
 727         if (sch->driver && sch->driver->chp_event)
 728                 sch->driver->chp_event(sch, &link,
 729                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 730         spin_unlock_irqrestore(sch->lock, flags);
 731 }
 732
 733 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 734 {
 735         struct chp_id *chpid = data;
 736
 737         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 738         return 0;
 739 }
 740
 741 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 742 {
 743         struct chp_id *chpid = data;
 744
 745         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 746         return 0;
 747 }
 748
 749 /**
 750  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 751  * @chpid: channl-path ID
 752  * @on: non-zero for vary online, zero for vary offline
 753  */
 754 int chsc_chp_vary(struct chp_id chpid, int on)
 755 {
 756         struct channel_path *chp = chpid_to_chp(chpid);
 757
 758         /* Wait until previous actions have settled. */
 759         css_wait_for_slow_path();
 760         /*
 761          * Redo PathVerification on the devices the chpid connects to
 762          */
 763         if (on) {
 764                 /* Try to update the channel path description. */
 765                 chp_update_desc(chp);
 766                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 767                                            NULL, &chpid);
 768                 css_schedule_reprobe();
 769         } else
 770                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 771                                            NULL, &chpid);
 772
 773         return 0;
 774 }
 775
 776 static void
 777 chsc_remove_cmg_attr(struct channel_subsystem *css)
 778 {
 779         int i;
 780
 781         for (i = 0; i <= __MAX_CHPID; i++) {
 782                 if (!css->chps[i])
 783                         continue;
 784                 chp_remove_cmg_attr(css->chps[i]);
 785         }
 786 }
 787
 788 static int
 789 chsc_add_cmg_attr(struct channel_subsystem *css)
 790 {
 791         int i, ret;
 792
 793         ret = 0;
 794         for (i = 0; i <= __MAX_CHPID; i++) {
 795                 if (!css->chps[i])
 796                         continue;
 797                 ret = chp_add_cmg_attr(css->chps[i]);
 798                 if (ret)
 799                         goto cleanup;
 800         }
 801         return ret;
 802 cleanup:
 803         for (--i; i >= 0; i--) {
 804                 if (!css->chps[i])
 805                         continue;
 806                 chp_remove_cmg_attr(css->chps[i]);
 807         }
 808         return ret;
 809 }
 810
 811 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 812 {
 813         struct {
 814                 struct chsc_header request;
 815                 u32 operation_code : 2;
 816                 u32 : 30;
 817                 u32 key : 4;
 818                 u32 : 28;
 819                 u32 zeroes1;
 820                 u32 cub_addr1;
 821                 u32 zeroes2;
 822                 u32 cub_addr2;
 823                 u32 reserved[13];
 824                 struct chsc_header response;
 825                 u32 status : 8;
 826                 u32 : 4;
 827                 u32 fmt : 4;
 828                 u32 : 16;
 829         } *secm_area;
 830         unsigned long flags;
 831         int ret, ccode;
 832
 833         spin_lock_irqsave(&chsc_page_lock, flags);
 834         memset(chsc_page, 0, PAGE_SIZE);
 835         secm_area = chsc_page;
 836         secm_area->request.length = 0x0050;
 837         secm_area->request.code = 0x0016;
 838
 839         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 840         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 841         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 842
 843         secm_area->operation_code = enable ? 0 : 1;
 844
 845         ccode = chsc(secm_area);
 846         if (ccode > 0) {
 847                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 848                 goto out;
 849         }
 850
 851         switch (secm_area->response.code) {
 852         case 0x0102:
 853         case 0x0103:
 854                 ret = -EINVAL;
 855                 break;
 856         default:
 857                 ret = chsc_error_from_response(secm_area->response.code);
 858         }
 859         if (ret != 0)
 860                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 861                               secm_area->response.code);
 862 out:
 863         spin_unlock_irqrestore(&chsc_page_lock, flags);
 864         return ret;
 865 }
 866
 867 int
 868 chsc_secm(struct channel_subsystem *css, int enable)
 869 {
 870         int ret;
 871
 872         if (enable && !css->cm_enabled) {
 873                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 874                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 875                 if (!css->cub_addr1 || !css->cub_addr2) {
 876                         free_page((unsigned long)css->cub_addr1);
 877                         free_page((unsigned long)css->cub_addr2);
 878                         return -ENOMEM;
 879                 }
 880         }
 881         ret = __chsc_do_secm(css, enable);
 882         if (!ret) {
 883                 css->cm_enabled = enable;
 884                 if (css->cm_enabled) {
 885                         ret = chsc_add_cmg_attr(css);
 886                         if (ret) {
 887                                 __chsc_do_secm(css, 0);
 888                                 css->cm_enabled = 0;
 889                         }
 890                 } else
 891                         chsc_remove_cmg_attr(css);
 892         }
 893         if (!css->cm_enabled) {
 894                 free_page((unsigned long)css->cub_addr1);
 895                 free_page((unsigned long)css->cub_addr2);
 896         }
 897         return ret;
 898 }
 899
 900 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 901                                      int c, int m, void *page)
 902 {
 903         struct chsc_scpd *scpd_area;
 904         int ccode, ret;
 905
 906         if ((rfmt == 1 || rfmt == 0) && c == 1 &&
 907             !css_general_characteristics.fcs)
 908                 return -EINVAL;
 909         if ((rfmt == 2) && !css_general_characteristics.cib)
 910                 return -EINVAL;
 911         if ((rfmt == 3) && !css_general_characteristics.util_str)
 912                 return -EINVAL;
 913
 914         memset(page, 0, PAGE_SIZE);
 915         scpd_area = page;
 916         scpd_area->request.length = 0x0010;
 917         scpd_area->request.code = 0x0002;
 918         scpd_area->cssid = chpid.cssid;
 919         scpd_area->first_chpid = chpid.id;
 920         scpd_area->last_chpid = chpid.id;
 921         scpd_area->m = m;
 922         scpd_area->c = c;
 923         scpd_area->fmt = fmt;
 924         scpd_area->rfmt = rfmt;
 925
 926         ccode = chsc(scpd_area);
 927         if (ccode > 0)
 928                 return (ccode == 3) ? -ENODEV : -EBUSY;
 929
 930         ret = chsc_error_from_response(scpd_area->response.code);
 931         if (ret)
 932                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 933                               scpd_area->response.code);
 934         return ret;
 935 }
 936 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 937
 938 #define chsc_det_chp_desc(FMT, c)                                       \
 939 int chsc_determine_fmt##FMT##_channel_path_desc(                        \
 940         struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc)   \
 941 {                                                                       \
 942         struct chsc_scpd *scpd_area;                                    \
 943         unsigned long flags;                                            \
 944         int ret;                                                        \
 945                                                                         \
 946         spin_lock_irqsave(&chsc_page_lock, flags);                      \
 947         scpd_area = chsc_page;                                          \
 948         ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0,     \
 949                                                scpd_area);              \
 950         if (ret)                                                        \
 951                 goto out;                                               \
 952                                                                         \
 953         memcpy(desc, scpd_area->data, sizeof(*desc));                   \
 954 out:                                                                    \
 955         spin_unlock_irqrestore(&chsc_page_lock, flags);                 \
 956         return ret;                                                     \
 957 }
 958
 959 chsc_det_chp_desc(0, 0)
 960 chsc_det_chp_desc(1, 1)
 961 chsc_det_chp_desc(3, 0)
 962
 963 static void
 964 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 965                           struct cmg_chars *chars)
 966 {
 967         int i, mask;
 968
 969         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 970                 mask = 0x80 >> (i + 3);
 971                 if (cmcv & mask)
 972                         chp->cmg_chars.values[i] = chars->values[i];
 973                 else
 974                         chp->cmg_chars.values[i] = 0;
 975         }
 976 }
 977
 978 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 979 {
 980         unsigned long flags;
 981         int ccode, ret;
 982
 983         struct {
 984                 struct chsc_header request;
 985                 u32 : 24;
 986                 u32 first_chpid : 8;
 987                 u32 : 24;
 988                 u32 last_chpid : 8;
 989                 u32 zeroes1;
 990                 struct chsc_header response;
 991                 u32 zeroes2;
 992                 u32 not_valid : 1;
 993                 u32 shared : 1;
 994                 u32 : 22;
 995                 u32 chpid : 8;
 996                 u32 cmcv : 5;
 997                 u32 : 11;
 998                 u32 cmgq : 8;
 999                 u32 cmg : 8;
1000                 u32 zeroes3;
1001                 u32 data[NR_MEASUREMENT_CHARS];
1002         } *scmc_area;
1003
1004         chp->shared = -1;
1005         chp->cmg = -1;
1006
1007         if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1008                 return -EINVAL;
1009
1010         spin_lock_irqsave(&chsc_page_lock, flags);
1011         memset(chsc_page, 0, PAGE_SIZE);
1012         scmc_area = chsc_page;
1013         scmc_area->request.length = 0x0010;
1014         scmc_area->request.code = 0x0022;
1015         scmc_area->first_chpid = chp->chpid.id;
1016         scmc_area->last_chpid = chp->chpid.id;
1017
1018         ccode = chsc(scmc_area);
1019         if (ccode > 0) {
1020                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1021                 goto out;
1022         }
1023
1024         ret = chsc_error_from_response(scmc_area->response.code);
1025         if (ret) {
1026                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1027                               scmc_area->response.code);
1028                 goto out;
1029         }
1030         if (scmc_area->not_valid)
1031                 goto out;
1032
1033         chp->cmg = scmc_area->cmg;
1034         chp->shared = scmc_area->shared;
1035         if (chp->cmg != 2 && chp->cmg != 3) {
1036                 /* No cmg-dependent data. */
1037                 goto out;
1038         }
1039         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1040                                   (struct cmg_chars *) &scmc_area->data);
1041 out:
1042         spin_unlock_irqrestore(&chsc_page_lock, flags);
1043         return ret;
1044 }
1045
1046 int __init chsc_init(void)
1047 {
1048         int ret;
1049
1050         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1051         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1052         if (!sei_page || !chsc_page) {
1053                 ret = -ENOMEM;
1054                 goto out_err;
1055         }
1056         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1057         if (ret)
1058                 goto out_err;
1059         return ret;
1060 out_err:
1061         free_page((unsigned long)chsc_page);
1062         free_page((unsigned long)sei_page);
1063         return ret;
1064 }
1065
1066 void __init chsc_init_cleanup(void)
1067 {
1068         crw_unregister_handler(CRW_RSC_CSS);
1069         free_page((unsigned long)chsc_page);
1070         free_page((unsigned long)sei_page);
1071 }
1072
1073 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1074 {
1075         int ret;
1076
1077         sda_area->request.length = 0x0400;
1078         sda_area->request.code = 0x0031;
1079         sda_area->operation_code = operation_code;
1080
1081         ret = chsc(sda_area);
1082         if (ret > 0) {
1083                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1084                 goto out;
1085         }
1086
1087         switch (sda_area->response.code) {
1088         case 0x0101:
1089                 ret = -EOPNOTSUPP;
1090                 break;
1091         default:
1092                 ret = chsc_error_from_response(sda_area->response.code);
1093         }
1094 out:
1095         return ret;
1096 }
1097
1098 int chsc_enable_facility(int operation_code)
1099 {
1100         struct chsc_sda_area *sda_area;
1101         unsigned long flags;
1102         int ret;
1103
1104         spin_lock_irqsave(&chsc_page_lock, flags);
1105         memset(chsc_page, 0, PAGE_SIZE);
1106         sda_area = chsc_page;
1107
1108         ret = __chsc_enable_facility(sda_area, operation_code);
1109         if (ret != 0)
1110                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1111                               operation_code, sda_area->response.code);
1112
1113         spin_unlock_irqrestore(&chsc_page_lock, flags);
1114         return ret;
1115 }
1116
1117 int __init chsc_get_cssid(int idx)
1118 {
1119         struct {
1120                 struct chsc_header request;
1121                 u8 atype;
1122                 u32 : 24;
1123                 u32 reserved1[6];
1124                 struct chsc_header response;
1125                 u32 reserved2[3];
1126                 struct {
1127                         u8 cssid;
1128                         u32 : 24;
1129                 } list[0];
1130         } *sdcal_area;
1131         int ret;
1132
1133         spin_lock_irq(&chsc_page_lock);
1134         memset(chsc_page, 0, PAGE_SIZE);
1135         sdcal_area = chsc_page;
1136         sdcal_area->request.length = 0x0020;
1137         sdcal_area->request.code = 0x0034;
1138         sdcal_area->atype = 4;
1139
1140         ret = chsc(sdcal_area);
1141         if (ret) {
1142                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1143                 goto exit;
1144         }
1145
1146         ret = chsc_error_from_response(sdcal_area->response.code);
1147         if (ret) {
1148                 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
1149                               sdcal_area->response.code);
1150                 goto exit;
1151         }
1152
1153         if ((addr_t) &sdcal_area->list[idx] <
1154             (addr_t) &sdcal_area->response + sdcal_area->response.length)
1155                 ret = sdcal_area->list[idx].cssid;
1156         else
1157                 ret = -ENODEV;
1158 exit:
1159         spin_unlock_irq(&chsc_page_lock);
1160         return ret;
1161 }
1162
1163 struct css_general_char css_general_characteristics;
1164 struct css_chsc_char css_chsc_characteristics;
1165
1166 int __init
1167 chsc_determine_css_characteristics(void)
1168 {
1169         unsigned long flags;
1170         int result;
1171         struct {
1172                 struct chsc_header request;
1173                 u32 reserved1;
1174                 u32 reserved2;
1175                 u32 reserved3;
1176                 struct chsc_header response;
1177                 u32 reserved4;
1178                 u32 general_char[510];
1179                 u32 chsc_char[508];
1180         } *scsc_area;
1181
1182         spin_lock_irqsave(&chsc_page_lock, flags);
1183         memset(chsc_page, 0, PAGE_SIZE);
1184         scsc_area = chsc_page;
1185         scsc_area->request.length = 0x0010;
1186         scsc_area->request.code = 0x0010;
1187
1188         result = chsc(scsc_area);
1189         if (result) {
1190                 result = (result == 3) ? -ENODEV : -EBUSY;
1191                 goto exit;
1192         }
1193
1194         result = chsc_error_from_response(scsc_area->response.code);
1195         if (result == 0) {
1196                 memcpy(&css_general_characteristics, scsc_area->general_char,
1197                        sizeof(css_general_characteristics));
1198                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1199                        sizeof(css_chsc_characteristics));
1200         } else
1201                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1202                               scsc_area->response.code);
1203 exit:
1204         spin_unlock_irqrestore(&chsc_page_lock, flags);
1205         return result;
1206 }
1207
1208 EXPORT_SYMBOL_GPL(css_general_characteristics);
1209 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1210
1211 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta)
1212 {
1213         struct {
1214                 struct chsc_header request;
1215                 unsigned int rsvd0;
1216                 unsigned int op : 8;
1217                 unsigned int rsvd1 : 8;
1218                 unsigned int ctrl : 16;
1219                 unsigned int rsvd2[5];
1220                 struct chsc_header response;
1221                 unsigned int rsvd3[3];
1222                 u64 clock_delta;
1223                 unsigned int rsvd4[2];
1224         } *rr;
1225         int rc;
1226
1227         memset(page, 0, PAGE_SIZE);
1228         rr = page;
1229         rr->request.length = 0x0020;
1230         rr->request.code = 0x0033;
1231         rr->op = op;
1232         rr->ctrl = ctrl;
1233         rc = chsc(rr);
1234         if (rc)
1235                 return -EIO;
1236         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1237         if (clock_delta)
1238                 *clock_delta = rr->clock_delta;
1239         return rc;
1240 }
1241
1242 int chsc_sstpi(void *page, void *result, size_t size)
1243 {
1244         struct {
1245                 struct chsc_header request;
1246                 unsigned int rsvd0[3];
1247                 struct chsc_header response;
1248                 char data[];
1249         } *rr;
1250         int rc;
1251
1252         memset(page, 0, PAGE_SIZE);
1253         rr = page;
1254         rr->request.length = 0x0010;
1255         rr->request.code = 0x0038;
1256         rc = chsc(rr);
1257         if (rc)
1258                 return -EIO;
1259         memcpy(result, &rr->data, size);
1260         return (rr->response.code == 0x0001) ? 0 : -EIO;
1261 }
1262
1263 int chsc_siosl(struct subchannel_id schid)
1264 {
1265         struct {
1266                 struct chsc_header request;
1267                 u32 word1;
1268                 struct subchannel_id sid;
1269                 u32 word3;
1270                 struct chsc_header response;
1271                 u32 word[11];
1272         } *siosl_area;
1273         unsigned long flags;
1274         int ccode;
1275         int rc;
1276
1277         spin_lock_irqsave(&chsc_page_lock, flags);
1278         memset(chsc_page, 0, PAGE_SIZE);
1279         siosl_area = chsc_page;
1280         siosl_area->request.length = 0x0010;
1281         siosl_area->request.code = 0x0046;
1282         siosl_area->word1 = 0x80000000;
1283         siosl_area->sid = schid;
1284
1285         ccode = chsc(siosl_area);
1286         if (ccode > 0) {
1287                 if (ccode == 3)
1288                         rc = -ENODEV;
1289                 else
1290                         rc = -EBUSY;
1291                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1292                               schid.ssid, schid.sch_no, ccode);
1293                 goto out;
1294         }
1295         rc = chsc_error_from_response(siosl_area->response.code);
1296         if (rc)
1297                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1298                               schid.ssid, schid.sch_no,
1299                               siosl_area->response.code);
1300         else
1301                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1302                               schid.ssid, schid.sch_no);
1303 out:
1304         spin_unlock_irqrestore(&chsc_page_lock, flags);
1305         return rc;
1306 }
1307 EXPORT_SYMBOL_GPL(chsc_siosl);
1308
1309 /**
1310  * chsc_scm_info() - store SCM information (SSI)
1311  * @scm_area: request and response block for SSI
1312  * @token: continuation token
1313  *
1314  * Returns 0 on success.
1315  */
1316 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1317 {
1318         int ccode, ret;
1319
1320         memset(scm_area, 0, sizeof(*scm_area));
1321         scm_area->request.length = 0x0020;
1322         scm_area->request.code = 0x004C;
1323         scm_area->reqtok = token;
1324
1325         ccode = chsc(scm_area);
1326         if (ccode > 0) {
1327                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1328                 goto out;
1329         }
1330         ret = chsc_error_from_response(scm_area->response.code);
1331         if (ret != 0)
1332                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1333                               scm_area->response.code);
1334 out:
1335         return ret;
1336 }
1337 EXPORT_SYMBOL_GPL(chsc_scm_info);
1338
1339 /**
1340  * chsc_pnso() - Perform Network-Subchannel Operation
1341  * @schid:              id of the subchannel on which PNSO is performed
1342  * @pnso_area:          request and response block for the operation
1343  * @resume_token:       resume token for multiblock response
1344  * @cnc:                Boolean change-notification control
1345  *
1346  * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1347  *
1348  * Returns 0 on success.
1349  */
1350 int chsc_pnso(struct subchannel_id schid,
1351               struct chsc_pnso_area *pnso_area,
1352               struct chsc_pnso_resume_token resume_token,
1353               int cnc)
1354 {
1355         memset(pnso_area, 0, sizeof(*pnso_area));
1356         pnso_area->request.length = 0x0030;
1357         pnso_area->request.code = 0x003d; /* network-subchannel operation */
1358         pnso_area->m       = schid.m;
1359         pnso_area->ssid  = schid.ssid;
1360         pnso_area->sch   = schid.sch_no;
1361         pnso_area->cssid = schid.cssid;
1362         pnso_area->oc    = 0; /* Store-network-bridging-information list */
1363         pnso_area->resume_token = resume_token;
1364         pnso_area->n       = (cnc != 0);
1365         if (chsc(pnso_area))
1366                 return -EIO;
1367         return chsc_error_from_response(pnso_area->response.code);
1368 }
1369
1370 int chsc_sgib(u32 origin)
1371 {
1372         struct {
1373                 struct chsc_header request;
1374                 u16 op;
1375                 u8  reserved01[2];
1376                 u8  reserved02:4;
1377                 u8  fmt:4;
1378                 u8  reserved03[7];
1379                 /* operation data area begin */
1380                 u8  reserved04[4];
1381                 u32 gib_origin;
1382                 u8  reserved05[10];
1383                 u8  aix;
1384                 u8  reserved06[4029];
1385                 struct chsc_header response;
1386                 u8  reserved07[4];
1387         } *sgib_area;
1388         int ret;
1389
1390         spin_lock_irq(&chsc_page_lock);
1391         memset(chsc_page, 0, PAGE_SIZE);
1392         sgib_area = chsc_page;
1393         sgib_area->request.length = 0x0fe0;
1394         sgib_area->request.code = 0x0021;
1395         sgib_area->op = 0x1;
1396         sgib_area->gib_origin = origin;
1397
1398         ret = chsc(sgib_area);
1399         if (ret == 0)
1400                 ret = chsc_error_from_response(sgib_area->response.code);
1401         spin_unlock_irq(&chsc_page_lock);
1402
1403         return ret;
1404 }
1405 EXPORT_SYMBOL_GPL(chsc_sgib);