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 #include <asm/ap.h>
  28
  29 #include "css.h"
  30 #include "cio.h"
  31 #include "cio_debug.h"
  32 #include "ioasm.h"
  33 #include "chp.h"
  34 #include "chsc.h"
  35
  36 static void *sei_page;
  37 static void *chsc_page;
  38 static DEFINE_SPINLOCK(chsc_page_lock);
  39
  40 /**
  41  * chsc_error_from_response() - convert a chsc response to an error
  42  * @response: chsc response code
  43  *
  44  * Returns an appropriate Linux error code for @response.
  45  */
  46 int chsc_error_from_response(int response)
  47 {
  48         switch (response) {
  49         case 0x0001:
  50                 return 0;
  51         case 0x0002:
  52         case 0x0003:
  53         case 0x0006:
  54         case 0x0007:
  55         case 0x0008:
  56         case 0x000a:
  57         case 0x0104:
  58                 return -EINVAL;
  59         case 0x0004:
  60                 return -EOPNOTSUPP;
  61         case 0x000b:
  62         case 0x0107:            /* "Channel busy" for the op 0x003d */
  63                 return -EBUSY;
  64         case 0x0100:
  65         case 0x0102:
  66                 return -ENOMEM;
  67         default:
  68                 return -EIO;
  69         }
  70 }
  71 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  72
  73 struct chsc_ssd_area {
  74         struct chsc_header request;
  75         u16 :10;
  76         u16 ssid:2;
  77         u16 :4;
  78         u16 f_sch;        /* first subchannel */
  79         u16 :16;
  80         u16 l_sch;        /* last subchannel */
  81         u32 :32;
  82         struct chsc_header response;
  83         u32 :32;
  84         u8 sch_valid : 1;
  85         u8 dev_valid : 1;
  86         u8 st        : 3; /* subchannel type */
  87         u8 zeroes    : 3;
  88         u8  unit_addr;    /* unit address */
  89         u16 devno;        /* device number */
  90         u8 path_mask;
  91         u8 fla_valid_mask;
  92         u16 sch;          /* subchannel */
  93         u8 chpid[8];      /* chpids 0-7 */
  94         u16 fla[8];       /* full link addresses 0-7 */
  95 } __packed __aligned(PAGE_SIZE);
  96
  97 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  98 {
  99         struct chsc_ssd_area *ssd_area;
 100         unsigned long flags;
 101         int ccode;
 102         int ret;
 103         int i;
 104         int mask;
 105
 106         spin_lock_irqsave(&chsc_page_lock, flags);
 107         memset(chsc_page, 0, PAGE_SIZE);
 108         ssd_area = chsc_page;
 109         ssd_area->request.length = 0x0010;
 110         ssd_area->request.code = 0x0004;
 111         ssd_area->ssid = schid.ssid;
 112         ssd_area->f_sch = schid.sch_no;
 113         ssd_area->l_sch = schid.sch_no;
 114
 115         ccode = chsc(ssd_area);
 116         /* Check response. */
 117         if (ccode > 0) {
 118                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 119                 goto out;
 120         }
 121         ret = chsc_error_from_response(ssd_area->response.code);
 122         if (ret != 0) {
 123                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 124                               schid.ssid, schid.sch_no,
 125                               ssd_area->response.code);
 126                 goto out;
 127         }
 128         if (!ssd_area->sch_valid) {
 129                 ret = -ENODEV;
 130                 goto out;
 131         }
 132         /* Copy data */
 133         ret = 0;
 134         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 135         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 136             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 137                 goto out;
 138         ssd->path_mask = ssd_area->path_mask;
 139         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 140         for (i = 0; i < 8; i++) {
 141                 mask = 0x80 >> i;
 142                 if (ssd_area->path_mask & mask) {
 143                         chp_id_init(&ssd->chpid[i]);
 144                         ssd->chpid[i].id = ssd_area->chpid[i];
 145                 }
 146                 if (ssd_area->fla_valid_mask & mask)
 147                         ssd->fla[i] = ssd_area->fla[i];
 148         }
 149 out:
 150         spin_unlock_irqrestore(&chsc_page_lock, flags);
 151         return ret;
 152 }
 153
 154 /**
 155  * chsc_ssqd() - store subchannel QDIO data (SSQD)
 156  * @schid: id of the subchannel on which SSQD is performed
 157  * @ssqd: request and response block for SSQD
 158  *
 159  * Returns 0 on success.
 160  */
 161 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 162 {
 163         memset(ssqd, 0, sizeof(*ssqd));
 164         ssqd->request.length = 0x0010;
 165         ssqd->request.code = 0x0024;
 166         ssqd->first_sch = schid.sch_no;
 167         ssqd->last_sch = schid.sch_no;
 168         ssqd->ssid = schid.ssid;
 169
 170         if (chsc(ssqd))
 171                 return -EIO;
 172
 173         return chsc_error_from_response(ssqd->response.code);
 174 }
 175 EXPORT_SYMBOL_GPL(chsc_ssqd);
 176
 177 /**
 178  * chsc_sadc() - set adapter device controls (SADC)
 179  * @schid: id of the subchannel on which SADC is performed
 180  * @scssc: request and response block for SADC
 181  * @summary_indicator_addr: summary indicator address
 182  * @subchannel_indicator_addr: subchannel indicator address
 183  *
 184  * Returns 0 on success.
 185  */
 186 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
 187               u64 summary_indicator_addr, u64 subchannel_indicator_addr)
 188 {
 189         memset(scssc, 0, sizeof(*scssc));
 190         scssc->request.length = 0x0fe0;
 191         scssc->request.code = 0x0021;
 192         scssc->operation_code = 0;
 193
 194         scssc->summary_indicator_addr = summary_indicator_addr;
 195         scssc->subchannel_indicator_addr = subchannel_indicator_addr;
 196
 197         scssc->ks = PAGE_DEFAULT_KEY >> 4;
 198         scssc->kc = PAGE_DEFAULT_KEY >> 4;
 199         scssc->isc = QDIO_AIRQ_ISC;
 200         scssc->schid = schid;
 201
 202         /* enable the time delay disablement facility */
 203         if (css_general_characteristics.aif_tdd)
 204                 scssc->word_with_d_bit = 0x10000000;
 205
 206         if (chsc(scssc))
 207                 return -EIO;
 208
 209         return chsc_error_from_response(scssc->response.code);
 210 }
 211 EXPORT_SYMBOL_GPL(chsc_sadc);
 212
 213 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 214 {
 215         spin_lock_irq(sch->lock);
 216         if (sch->driver && sch->driver->chp_event)
 217                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 218                         goto out_unreg;
 219         spin_unlock_irq(sch->lock);
 220         return 0;
 221
 222 out_unreg:
 223         sch->lpm = 0;
 224         spin_unlock_irq(sch->lock);
 225         css_schedule_eval(sch->schid);
 226         return 0;
 227 }
 228
 229 void chsc_chp_offline(struct chp_id chpid)
 230 {
 231         struct channel_path *chp = chpid_to_chp(chpid);
 232         struct chp_link link;
 233         char dbf_txt[15];
 234
 235         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 236         CIO_TRACE_EVENT(2, dbf_txt);
 237
 238         if (chp_get_status(chpid) <= 0)
 239                 return;
 240         memset(&link, 0, sizeof(struct chp_link));
 241         link.chpid = chpid;
 242         /* Wait until previous actions have settled. */
 243         css_wait_for_slow_path();
 244
 245         mutex_lock(&chp->lock);
 246         chp_update_desc(chp);
 247         mutex_unlock(&chp->lock);
 248
 249         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 250 }
 251
 252 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 253 {
 254         spin_lock_irq(sch->lock);
 255         if (sch->driver && sch->driver->chp_event)
 256                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 257         spin_unlock_irq(sch->lock);
 258
 259         return 0;
 260 }
 261
 262 static void s390_process_res_acc(struct chp_link *link)
 263 {
 264         char dbf_txt[15];
 265
 266         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 267                 link->chpid.id);
 268         CIO_TRACE_EVENT( 2, dbf_txt);
 269         if (link->fla != 0) {
 270                 sprintf(dbf_txt, "fla%x", link->fla);
 271                 CIO_TRACE_EVENT( 2, dbf_txt);
 272         }
 273         /* Wait until previous actions have settled. */
 274         css_wait_for_slow_path();
 275         /*
 276          * I/O resources may have become accessible.
 277          * Scan through all subchannels that may be concerned and
 278          * do a validation on those.
 279          * The more information we have (info), the less scanning
 280          * will we have to do.
 281          */
 282         for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
 283         css_schedule_reprobe();
 284 }
 285
 286 struct chsc_sei_nt0_area {
 287         u8  flags;
 288         u8  vf;                         /* validity flags */
 289         u8  rs;                         /* reporting source */
 290         u8  cc;                         /* content code */
 291         u16 fla;                        /* full link address */
 292         u16 rsid;                       /* reporting source id */
 293         u32 reserved1;
 294         u32 reserved2;
 295         /* ccdf has to be big enough for a link-incident record */
 296         u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 297 } __packed;
 298
 299 struct chsc_sei_nt2_area {
 300         u8  flags;                      /* p and v bit */
 301         u8  reserved1;
 302         u8  reserved2;
 303         u8  cc;                         /* content code */
 304         u32 reserved3[13];
 305         u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 306 } __packed;
 307
 308 #define CHSC_SEI_NT0    (1ULL << 63)
 309 #define CHSC_SEI_NT2    (1ULL << 61)
 310
 311 struct chsc_sei {
 312         struct chsc_header request;
 313         u32 reserved1;
 314         u64 ntsm;                       /* notification type mask */
 315         struct chsc_header response;
 316         u32 :24;
 317         u8 nt;
 318         union {
 319                 struct chsc_sei_nt0_area nt0_area;
 320                 struct chsc_sei_nt2_area nt2_area;
 321                 u8 nt_area[PAGE_SIZE - 24];
 322         } u;
 323 } __packed __aligned(PAGE_SIZE);
 324
 325 /*
 326  * Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands"
 327  */
 328
 329 #define ND_VALIDITY_VALID       0
 330 #define ND_VALIDITY_OUTDATED    1
 331 #define ND_VALIDITY_INVALID     2
 332
 333 struct node_descriptor {
 334         /* Flags. */
 335         union {
 336                 struct {
 337                         u32 validity:3;
 338                         u32 reserved:5;
 339                 } __packed;
 340                 u8 byte0;
 341         } __packed;
 342
 343         /* Node parameters. */
 344         u32 params:24;
 345
 346         /* Node ID. */
 347         char type[6];
 348         char model[3];
 349         char manufacturer[3];
 350         char plant[2];
 351         char seq[12];
 352         u16 tag;
 353 } __packed;
 354
 355 /*
 356  * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
 357  */
 358
 359 #define LIR_IQ_CLASS_INFO               0
 360 #define LIR_IQ_CLASS_DEGRADED           1
 361 #define LIR_IQ_CLASS_NOT_OPERATIONAL    2
 362
 363 struct lir {
 364         struct {
 365                 u32 null:1;
 366                 u32 reserved:3;
 367                 u32 class:2;
 368                 u32 reserved2:2;
 369         } __packed iq;
 370         u32 ic:8;
 371         u32 reserved:16;
 372         struct node_descriptor incident_node;
 373         struct node_descriptor attached_node;
 374         u8 reserved2[32];
 375 } __packed;
 376
 377 #define PARAMS_LEN      10      /* PARAMS=xx,xxxxxx */
 378 #define NODEID_LEN      35      /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 379
 380 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
 381 static char *store_ebcdic(char *dest, const char *src, unsigned long len,
 382                           char delim)
 383 {
 384         memcpy(dest, src, len);
 385         EBCASC(dest, len);
 386
 387         if (delim)
 388                 dest[len++] = delim;
 389
 390         return dest + len;
 391 }
 392
 393 /* Format node ID and parameters for output in LIR log message. */
 394 static void format_node_data(char *params, char *id, struct node_descriptor *nd)
 395 {
 396         memset(params, 0, PARAMS_LEN);
 397         memset(id, 0, NODEID_LEN);
 398
 399         if (nd->validity != ND_VALIDITY_VALID) {
 400                 strncpy(params, "n/a", PARAMS_LEN - 1);
 401                 strncpy(id, "n/a", NODEID_LEN - 1);
 402                 return;
 403         }
 404
 405         /* PARAMS=xx,xxxxxx */
 406         snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
 407         /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 408         id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
 409         id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
 410         id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
 411         id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
 412         id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
 413         sprintf(id, "%04X", nd->tag);
 414 }
 415
 416 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 417 {
 418         struct lir *lir = (struct lir *) &sei_area->ccdf;
 419         char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
 420              aunodeid[NODEID_LEN];
 421
 422         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
 423                       sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
 424
 425         /* Ignore NULL Link Incident Records. */
 426         if (lir->iq.null)
 427                 return;
 428
 429         /* Inform user that a link requires maintenance actions because it has
 430          * become degraded or not operational. Note that this log message is
 431          * the primary intention behind a Link Incident Record. */
 432
 433         format_node_data(iuparams, iunodeid, &lir->incident_node);
 434         format_node_data(auparams, aunodeid, &lir->attached_node);
 435
 436         switch (lir->iq.class) {
 437         case LIR_IQ_CLASS_DEGRADED:
 438                 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
 439                         "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 440                         sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 441                         iunodeid, auparams, aunodeid);
 442                 break;
 443         case LIR_IQ_CLASS_NOT_OPERATIONAL:
 444                 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
 445                        "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 446                        sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 447                        iunodeid, auparams, aunodeid);
 448                 break;
 449         default:
 450                 break;
 451         }
 452 }
 453
 454 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 455 {
 456         struct channel_path *chp;
 457         struct chp_link link;
 458         struct chp_id chpid;
 459         int status;
 460
 461         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 462                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 463         if (sei_area->rs != 4)
 464                 return;
 465         chp_id_init(&chpid);
 466         chpid.id = sei_area->rsid;
 467         /* allocate a new channel path structure, if needed */
 468         status = chp_get_status(chpid);
 469         if (!status)
 470                 return;
 471
 472         if (status < 0) {
 473                 chp_new(chpid);
 474         } else {
 475                 chp = chpid_to_chp(chpid);
 476                 mutex_lock(&chp->lock);
 477                 chp_update_desc(chp);
 478                 mutex_unlock(&chp->lock);
 479         }
 480         memset(&link, 0, sizeof(struct chp_link));
 481         link.chpid = chpid;
 482         if ((sei_area->vf & 0xc0) != 0) {
 483                 link.fla = sei_area->fla;
 484                 if ((sei_area->vf & 0xc0) == 0xc0)
 485                         /* full link address */
 486                         link.fla_mask = 0xffff;
 487                 else
 488                         /* link address */
 489                         link.fla_mask = 0xff00;
 490         }
 491         s390_process_res_acc(&link);
 492 }
 493
 494 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 495 {
 496         struct channel_path *chp;
 497         struct chp_id chpid;
 498         u8 *data;
 499         int num;
 500
 501         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 502         if (sei_area->rs != 0)
 503                 return;
 504         data = sei_area->ccdf;
 505         chp_id_init(&chpid);
 506         for (num = 0; num <= __MAX_CHPID; num++) {
 507                 if (!chp_test_bit(data, num))
 508                         continue;
 509                 chpid.id = num;
 510
 511                 CIO_CRW_EVENT(4, "Update information for channel path "
 512                               "%x.%02x\n", chpid.cssid, chpid.id);
 513                 chp = chpid_to_chp(chpid);
 514                 if (!chp) {
 515                         chp_new(chpid);
 516                         continue;
 517                 }
 518                 mutex_lock(&chp->lock);
 519                 chp_update_desc(chp);
 520                 mutex_unlock(&chp->lock);
 521         }
 522 }
 523
 524 struct chp_config_data {
 525         u8 map[32];
 526         u8 op;
 527         u8 pc;
 528 };
 529
 530 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 531 {
 532         struct chp_config_data *data;
 533         struct chp_id chpid;
 534         int num;
 535         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 536
 537         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 538         if (sei_area->rs != 0)
 539                 return;
 540         data = (struct chp_config_data *) &(sei_area->ccdf);
 541         chp_id_init(&chpid);
 542         for (num = 0; num <= __MAX_CHPID; num++) {
 543                 if (!chp_test_bit(data->map, num))
 544                         continue;
 545                 chpid.id = num;
 546                 pr_notice("Processing %s for channel path %x.%02x\n",
 547                           events[data->op], chpid.cssid, chpid.id);
 548                 switch (data->op) {
 549                 case 0:
 550                         chp_cfg_schedule(chpid, 1);
 551                         break;
 552                 case 1:
 553                         chp_cfg_schedule(chpid, 0);
 554                         break;
 555                 case 2:
 556                         chp_cfg_cancel_deconfigure(chpid);
 557                         break;
 558                 }
 559         }
 560 }
 561
 562 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 563 {
 564         int ret;
 565
 566         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 567         if (sei_area->rs != 7)
 568                 return;
 569
 570         ret = scm_update_information();
 571         if (ret)
 572                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 573                               " failed (rc=%d).\n", ret);
 574 }
 575
 576 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 577 {
 578         int ret;
 579
 580         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 581         if (sei_area->rs != 7)
 582                 return;
 583
 584         ret = scm_process_availability_information();
 585         if (ret)
 586                 CIO_CRW_EVENT(0, "chsc: process availability information"
 587                               " failed (rc=%d).\n", ret);
 588 }
 589
 590 static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
 591 {
 592         CIO_CRW_EVENT(3, "chsc: ap config changed\n");
 593         if (sei_area->rs != 5)
 594                 return;
 595
 596         ap_bus_cfg_chg();
 597 }
 598
 599 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 600 {
 601         switch (sei_area->cc) {
 602         case 1:
 603                 zpci_event_error(sei_area->ccdf);
 604                 break;
 605         case 2:
 606                 zpci_event_availability(sei_area->ccdf);
 607                 break;
 608         default:
 609                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 610                               sei_area->cc);
 611                 break;
 612         }
 613 }
 614
 615 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 616 {
 617         /* which kind of information was stored? */
 618         switch (sei_area->cc) {
 619         case 1: /* link incident*/
 620                 chsc_process_sei_link_incident(sei_area);
 621                 break;
 622         case 2: /* i/o resource accessibility */
 623                 chsc_process_sei_res_acc(sei_area);
 624                 break;
 625         case 3: /* ap config changed */
 626                 chsc_process_sei_ap_cfg_chg(sei_area);
 627                 break;
 628         case 7: /* channel-path-availability information */
 629                 chsc_process_sei_chp_avail(sei_area);
 630                 break;
 631         case 8: /* channel-path-configuration notification */
 632                 chsc_process_sei_chp_config(sei_area);
 633                 break;
 634         case 12: /* scm change notification */
 635                 chsc_process_sei_scm_change(sei_area);
 636                 break;
 637         case 14: /* scm available notification */
 638                 chsc_process_sei_scm_avail(sei_area);
 639                 break;
 640         default: /* other stuff */
 641                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 642                               sei_area->cc);
 643                 break;
 644         }
 645
 646         /* Check if we might have lost some information. */
 647         if (sei_area->flags & 0x40) {
 648                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 649                 css_schedule_eval_all();
 650         }
 651 }
 652
 653 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 654 {
 655         static int ntsm_unsupported;
 656
 657         while (true) {
 658                 memset(sei, 0, sizeof(*sei));
 659                 sei->request.length = 0x0010;
 660                 sei->request.code = 0x000e;
 661                 if (!ntsm_unsupported)
 662                         sei->ntsm = ntsm;
 663
 664                 if (chsc(sei))
 665                         break;
 666
 667                 if (sei->response.code != 0x0001) {
 668                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
 669                                       sei->response.code, sei->ntsm);
 670
 671                         if (sei->response.code == 3 && sei->ntsm) {
 672                                 /* Fallback for old firmware. */
 673                                 ntsm_unsupported = 1;
 674                                 continue;
 675                         }
 676                         break;
 677                 }
 678
 679                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 680                 switch (sei->nt) {
 681                 case 0:
 682                         chsc_process_sei_nt0(&sei->u.nt0_area);
 683                         break;
 684                 case 2:
 685                         chsc_process_sei_nt2(&sei->u.nt2_area);
 686                         break;
 687                 default:
 688                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 689                         break;
 690                 }
 691
 692                 if (!(sei->u.nt0_area.flags & 0x80))
 693                         break;
 694         }
 695 }
 696
 697 /*
 698  * Handle channel subsystem related CRWs.
 699  * Use store event information to find out what's going on.
 700  *
 701  * Note: Access to sei_page is serialized through machine check handler
 702  * thread, so no need for locking.
 703  */
 704 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 705 {
 706         struct chsc_sei *sei = sei_page;
 707
 708         if (overflow) {
 709                 css_schedule_eval_all();
 710                 return;
 711         }
 712         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 713                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 714                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 715                       crw0->erc, crw0->rsid);
 716
 717         CIO_TRACE_EVENT(2, "prcss");
 718         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 719 }
 720
 721 void chsc_chp_online(struct chp_id chpid)
 722 {
 723         struct channel_path *chp = chpid_to_chp(chpid);
 724         struct chp_link link;
 725         char dbf_txt[15];
 726
 727         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 728         CIO_TRACE_EVENT(2, dbf_txt);
 729
 730         if (chp_get_status(chpid) != 0) {
 731                 memset(&link, 0, sizeof(struct chp_link));
 732                 link.chpid = chpid;
 733                 /* Wait until previous actions have settled. */
 734                 css_wait_for_slow_path();
 735
 736                 mutex_lock(&chp->lock);
 737                 chp_update_desc(chp);
 738                 mutex_unlock(&chp->lock);
 739
 740                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 741                                            &link);
 742                 css_schedule_reprobe();
 743         }
 744 }
 745
 746 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 747                                          struct chp_id chpid, int on)
 748 {
 749         unsigned long flags;
 750         struct chp_link link;
 751
 752         memset(&link, 0, sizeof(struct chp_link));
 753         link.chpid = chpid;
 754         spin_lock_irqsave(sch->lock, flags);
 755         if (sch->driver && sch->driver->chp_event)
 756                 sch->driver->chp_event(sch, &link,
 757                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 758         spin_unlock_irqrestore(sch->lock, flags);
 759 }
 760
 761 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 762 {
 763         struct chp_id *chpid = data;
 764
 765         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 766         return 0;
 767 }
 768
 769 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 770 {
 771         struct chp_id *chpid = data;
 772
 773         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 774         return 0;
 775 }
 776
 777 /**
 778  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 779  * @chpid: channl-path ID
 780  * @on: non-zero for vary online, zero for vary offline
 781  */
 782 int chsc_chp_vary(struct chp_id chpid, int on)
 783 {
 784         struct channel_path *chp = chpid_to_chp(chpid);
 785
 786         /* Wait until previous actions have settled. */
 787         css_wait_for_slow_path();
 788         /*
 789          * Redo PathVerification on the devices the chpid connects to
 790          */
 791         if (on) {
 792                 /* Try to update the channel path description. */
 793                 chp_update_desc(chp);
 794                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 795                                            NULL, &chpid);
 796                 css_schedule_reprobe();
 797         } else
 798                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 799                                            NULL, &chpid);
 800
 801         return 0;
 802 }
 803
 804 static void
 805 chsc_remove_cmg_attr(struct channel_subsystem *css)
 806 {
 807         int i;
 808
 809         for (i = 0; i <= __MAX_CHPID; i++) {
 810                 if (!css->chps[i])
 811                         continue;
 812                 chp_remove_cmg_attr(css->chps[i]);
 813         }
 814 }
 815
 816 static int
 817 chsc_add_cmg_attr(struct channel_subsystem *css)
 818 {
 819         int i, ret;
 820
 821         ret = 0;
 822         for (i = 0; i <= __MAX_CHPID; i++) {
 823                 if (!css->chps[i])
 824                         continue;
 825                 ret = chp_add_cmg_attr(css->chps[i]);
 826                 if (ret)
 827                         goto cleanup;
 828         }
 829         return ret;
 830 cleanup:
 831         for (--i; i >= 0; i--) {
 832                 if (!css->chps[i])
 833                         continue;
 834                 chp_remove_cmg_attr(css->chps[i]);
 835         }
 836         return ret;
 837 }
 838
 839 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 840 {
 841         struct {
 842                 struct chsc_header request;
 843                 u32 operation_code : 2;
 844                 u32 : 30;
 845                 u32 key : 4;
 846                 u32 : 28;
 847                 u32 zeroes1;
 848                 u32 cub_addr1;
 849                 u32 zeroes2;
 850                 u32 cub_addr2;
 851                 u32 reserved[13];
 852                 struct chsc_header response;
 853                 u32 status : 8;
 854                 u32 : 4;
 855                 u32 fmt : 4;
 856                 u32 : 16;
 857         } *secm_area;
 858         unsigned long flags;
 859         int ret, ccode;
 860
 861         spin_lock_irqsave(&chsc_page_lock, flags);
 862         memset(chsc_page, 0, PAGE_SIZE);
 863         secm_area = chsc_page;
 864         secm_area->request.length = 0x0050;
 865         secm_area->request.code = 0x0016;
 866
 867         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 868         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 869         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 870
 871         secm_area->operation_code = enable ? 0 : 1;
 872
 873         ccode = chsc(secm_area);
 874         if (ccode > 0) {
 875                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 876                 goto out;
 877         }
 878
 879         switch (secm_area->response.code) {
 880         case 0x0102:
 881         case 0x0103:
 882                 ret = -EINVAL;
 883                 break;
 884         default:
 885                 ret = chsc_error_from_response(secm_area->response.code);
 886         }
 887         if (ret != 0)
 888                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 889                               secm_area->response.code);
 890 out:
 891         spin_unlock_irqrestore(&chsc_page_lock, flags);
 892         return ret;
 893 }
 894
 895 int
 896 chsc_secm(struct channel_subsystem *css, int enable)
 897 {
 898         int ret;
 899
 900         if (enable && !css->cm_enabled) {
 901                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 902                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 903                 if (!css->cub_addr1 || !css->cub_addr2) {
 904                         free_page((unsigned long)css->cub_addr1);
 905                         free_page((unsigned long)css->cub_addr2);
 906                         return -ENOMEM;
 907                 }
 908         }
 909         ret = __chsc_do_secm(css, enable);
 910         if (!ret) {
 911                 css->cm_enabled = enable;
 912                 if (css->cm_enabled) {
 913                         ret = chsc_add_cmg_attr(css);
 914                         if (ret) {
 915                                 __chsc_do_secm(css, 0);
 916                                 css->cm_enabled = 0;
 917                         }
 918                 } else
 919                         chsc_remove_cmg_attr(css);
 920         }
 921         if (!css->cm_enabled) {
 922                 free_page((unsigned long)css->cub_addr1);
 923                 free_page((unsigned long)css->cub_addr2);
 924         }
 925         return ret;
 926 }
 927
 928 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 929                                      int c, int m, void *page)
 930 {
 931         struct chsc_scpd *scpd_area;
 932         int ccode, ret;
 933
 934         if ((rfmt == 1 || rfmt == 0) && c == 1 &&
 935             !css_general_characteristics.fcs)
 936                 return -EINVAL;
 937         if ((rfmt == 2) && !css_general_characteristics.cib)
 938                 return -EINVAL;
 939         if ((rfmt == 3) && !css_general_characteristics.util_str)
 940                 return -EINVAL;
 941
 942         memset(page, 0, PAGE_SIZE);
 943         scpd_area = page;
 944         scpd_area->request.length = 0x0010;
 945         scpd_area->request.code = 0x0002;
 946         scpd_area->cssid = chpid.cssid;
 947         scpd_area->first_chpid = chpid.id;
 948         scpd_area->last_chpid = chpid.id;
 949         scpd_area->m = m;
 950         scpd_area->c = c;
 951         scpd_area->fmt = fmt;
 952         scpd_area->rfmt = rfmt;
 953
 954         ccode = chsc(scpd_area);
 955         if (ccode > 0)
 956                 return (ccode == 3) ? -ENODEV : -EBUSY;
 957
 958         ret = chsc_error_from_response(scpd_area->response.code);
 959         if (ret)
 960                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 961                               scpd_area->response.code);
 962         return ret;
 963 }
 964 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 965
 966 #define chsc_det_chp_desc(FMT, c)                                       \
 967 int chsc_determine_fmt##FMT##_channel_path_desc(                        \
 968         struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc)   \
 969 {                                                                       \
 970         struct chsc_scpd *scpd_area;                                    \
 971         unsigned long flags;                                            \
 972         int ret;                                                        \
 973                                                                         \
 974         spin_lock_irqsave(&chsc_page_lock, flags);                      \
 975         scpd_area = chsc_page;                                          \
 976         ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0,     \
 977                                                scpd_area);              \
 978         if (ret)                                                        \
 979                 goto out;                                               \
 980                                                                         \
 981         memcpy(desc, scpd_area->data, sizeof(*desc));                   \
 982 out:                                                                    \
 983         spin_unlock_irqrestore(&chsc_page_lock, flags);                 \
 984         return ret;                                                     \
 985 }
 986
 987 chsc_det_chp_desc(0, 0)
 988 chsc_det_chp_desc(1, 1)
 989 chsc_det_chp_desc(3, 0)
 990
 991 static void
 992 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 993                           struct cmg_chars *chars)
 994 {
 995         int i, mask;
 996
 997         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 998                 mask = 0x80 >> (i + 3);
 999                 if (cmcv & mask)
1000                         chp->cmg_chars.values[i] = chars->values[i];
1001                 else
1002                         chp->cmg_chars.values[i] = 0;
1003         }
1004 }
1005
1006 int chsc_get_channel_measurement_chars(struct channel_path *chp)
1007 {
1008         unsigned long flags;
1009         int ccode, ret;
1010
1011         struct {
1012                 struct chsc_header request;
1013                 u32 : 24;
1014                 u32 first_chpid : 8;
1015                 u32 : 24;
1016                 u32 last_chpid : 8;
1017                 u32 zeroes1;
1018                 struct chsc_header response;
1019                 u32 zeroes2;
1020                 u32 not_valid : 1;
1021                 u32 shared : 1;
1022                 u32 : 22;
1023                 u32 chpid : 8;
1024                 u32 cmcv : 5;
1025                 u32 : 11;
1026                 u32 cmgq : 8;
1027                 u32 cmg : 8;
1028                 u32 zeroes3;
1029                 u32 data[NR_MEASUREMENT_CHARS];
1030         } *scmc_area;
1031
1032         chp->shared = -1;
1033         chp->cmg = -1;
1034
1035         if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1036                 return -EINVAL;
1037
1038         spin_lock_irqsave(&chsc_page_lock, flags);
1039         memset(chsc_page, 0, PAGE_SIZE);
1040         scmc_area = chsc_page;
1041         scmc_area->request.length = 0x0010;
1042         scmc_area->request.code = 0x0022;
1043         scmc_area->first_chpid = chp->chpid.id;
1044         scmc_area->last_chpid = chp->chpid.id;
1045
1046         ccode = chsc(scmc_area);
1047         if (ccode > 0) {
1048                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1049                 goto out;
1050         }
1051
1052         ret = chsc_error_from_response(scmc_area->response.code);
1053         if (ret) {
1054                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1055                               scmc_area->response.code);
1056                 goto out;
1057         }
1058         if (scmc_area->not_valid)
1059                 goto out;
1060
1061         chp->cmg = scmc_area->cmg;
1062         chp->shared = scmc_area->shared;
1063         if (chp->cmg != 2 && chp->cmg != 3) {
1064                 /* No cmg-dependent data. */
1065                 goto out;
1066         }
1067         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
1068                                   (struct cmg_chars *) &scmc_area->data);
1069 out:
1070         spin_unlock_irqrestore(&chsc_page_lock, flags);
1071         return ret;
1072 }
1073
1074 int __init chsc_init(void)
1075 {
1076         int ret;
1077
1078         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1079         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1080         if (!sei_page || !chsc_page) {
1081                 ret = -ENOMEM;
1082                 goto out_err;
1083         }
1084         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1085         if (ret)
1086                 goto out_err;
1087         return ret;
1088 out_err:
1089         free_page((unsigned long)chsc_page);
1090         free_page((unsigned long)sei_page);
1091         return ret;
1092 }
1093
1094 void __init chsc_init_cleanup(void)
1095 {
1096         crw_unregister_handler(CRW_RSC_CSS);
1097         free_page((unsigned long)chsc_page);
1098         free_page((unsigned long)sei_page);
1099 }
1100
1101 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1102 {
1103         int ret;
1104
1105         sda_area->request.length = 0x0400;
1106         sda_area->request.code = 0x0031;
1107         sda_area->operation_code = operation_code;
1108
1109         ret = chsc(sda_area);
1110         if (ret > 0) {
1111                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1112                 goto out;
1113         }
1114
1115         switch (sda_area->response.code) {
1116         case 0x0101:
1117                 ret = -EOPNOTSUPP;
1118                 break;
1119         default:
1120                 ret = chsc_error_from_response(sda_area->response.code);
1121         }
1122 out:
1123         return ret;
1124 }
1125
1126 int chsc_enable_facility(int operation_code)
1127 {
1128         struct chsc_sda_area *sda_area;
1129         unsigned long flags;
1130         int ret;
1131
1132         spin_lock_irqsave(&chsc_page_lock, flags);
1133         memset(chsc_page, 0, PAGE_SIZE);
1134         sda_area = chsc_page;
1135
1136         ret = __chsc_enable_facility(sda_area, operation_code);
1137         if (ret != 0)
1138                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1139                               operation_code, sda_area->response.code);
1140
1141         spin_unlock_irqrestore(&chsc_page_lock, flags);
1142         return ret;
1143 }
1144
1145 int __init chsc_get_cssid(int idx)
1146 {
1147         struct {
1148                 struct chsc_header request;
1149                 u8 atype;
1150                 u32 : 24;
1151                 u32 reserved1[6];
1152                 struct chsc_header response;
1153                 u32 reserved2[3];
1154                 struct {
1155                         u8 cssid;
1156                         u32 : 24;
1157                 } list[0];
1158         } *sdcal_area;
1159         int ret;
1160
1161         spin_lock_irq(&chsc_page_lock);
1162         memset(chsc_page, 0, PAGE_SIZE);
1163         sdcal_area = chsc_page;
1164         sdcal_area->request.length = 0x0020;
1165         sdcal_area->request.code = 0x0034;
1166         sdcal_area->atype = 4;
1167
1168         ret = chsc(sdcal_area);
1169         if (ret) {
1170                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1171                 goto exit;
1172         }
1173
1174         ret = chsc_error_from_response(sdcal_area->response.code);
1175         if (ret) {
1176                 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
1177                               sdcal_area->response.code);
1178                 goto exit;
1179         }
1180
1181         if ((addr_t) &sdcal_area->list[idx] <
1182             (addr_t) &sdcal_area->response + sdcal_area->response.length)
1183                 ret = sdcal_area->list[idx].cssid;
1184         else
1185                 ret = -ENODEV;
1186 exit:
1187         spin_unlock_irq(&chsc_page_lock);
1188         return ret;
1189 }
1190
1191 struct css_general_char css_general_characteristics;
1192 struct css_chsc_char css_chsc_characteristics;
1193
1194 int __init
1195 chsc_determine_css_characteristics(void)
1196 {
1197         unsigned long flags;
1198         int result;
1199         struct {
1200                 struct chsc_header request;
1201                 u32 reserved1;
1202                 u32 reserved2;
1203                 u32 reserved3;
1204                 struct chsc_header response;
1205                 u32 reserved4;
1206                 u32 general_char[510];
1207                 u32 chsc_char[508];
1208         } *scsc_area;
1209
1210         spin_lock_irqsave(&chsc_page_lock, flags);
1211         memset(chsc_page, 0, PAGE_SIZE);
1212         scsc_area = chsc_page;
1213         scsc_area->request.length = 0x0010;
1214         scsc_area->request.code = 0x0010;
1215
1216         result = chsc(scsc_area);
1217         if (result) {
1218                 result = (result == 3) ? -ENODEV : -EBUSY;
1219                 goto exit;
1220         }
1221
1222         result = chsc_error_from_response(scsc_area->response.code);
1223         if (result == 0) {
1224                 memcpy(&css_general_characteristics, scsc_area->general_char,
1225                        sizeof(css_general_characteristics));
1226                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1227                        sizeof(css_chsc_characteristics));
1228         } else
1229                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1230                               scsc_area->response.code);
1231 exit:
1232         spin_unlock_irqrestore(&chsc_page_lock, flags);
1233         return result;
1234 }
1235
1236 EXPORT_SYMBOL_GPL(css_general_characteristics);
1237 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1238
1239 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta)
1240 {
1241         struct {
1242                 struct chsc_header request;
1243                 unsigned int rsvd0;
1244                 unsigned int op : 8;
1245                 unsigned int rsvd1 : 8;
1246                 unsigned int ctrl : 16;
1247                 unsigned int rsvd2[5];
1248                 struct chsc_header response;
1249                 unsigned int rsvd3[3];
1250                 u64 clock_delta;
1251                 unsigned int rsvd4[2];
1252         } *rr;
1253         int rc;
1254
1255         memset(page, 0, PAGE_SIZE);
1256         rr = page;
1257         rr->request.length = 0x0020;
1258         rr->request.code = 0x0033;
1259         rr->op = op;
1260         rr->ctrl = ctrl;
1261         rc = chsc(rr);
1262         if (rc)
1263                 return -EIO;
1264         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1265         if (clock_delta)
1266                 *clock_delta = rr->clock_delta;
1267         return rc;
1268 }
1269
1270 int chsc_sstpi(void *page, void *result, size_t size)
1271 {
1272         struct {
1273                 struct chsc_header request;
1274                 unsigned int rsvd0[3];
1275                 struct chsc_header response;
1276                 char data[];
1277         } *rr;
1278         int rc;
1279
1280         memset(page, 0, PAGE_SIZE);
1281         rr = page;
1282         rr->request.length = 0x0010;
1283         rr->request.code = 0x0038;
1284         rc = chsc(rr);
1285         if (rc)
1286                 return -EIO;
1287         memcpy(result, &rr->data, size);
1288         return (rr->response.code == 0x0001) ? 0 : -EIO;
1289 }
1290
1291 int chsc_siosl(struct subchannel_id schid)
1292 {
1293         struct {
1294                 struct chsc_header request;
1295                 u32 word1;
1296                 struct subchannel_id sid;
1297                 u32 word3;
1298                 struct chsc_header response;
1299                 u32 word[11];
1300         } *siosl_area;
1301         unsigned long flags;
1302         int ccode;
1303         int rc;
1304
1305         spin_lock_irqsave(&chsc_page_lock, flags);
1306         memset(chsc_page, 0, PAGE_SIZE);
1307         siosl_area = chsc_page;
1308         siosl_area->request.length = 0x0010;
1309         siosl_area->request.code = 0x0046;
1310         siosl_area->word1 = 0x80000000;
1311         siosl_area->sid = schid;
1312
1313         ccode = chsc(siosl_area);
1314         if (ccode > 0) {
1315                 if (ccode == 3)
1316                         rc = -ENODEV;
1317                 else
1318                         rc = -EBUSY;
1319                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1320                               schid.ssid, schid.sch_no, ccode);
1321                 goto out;
1322         }
1323         rc = chsc_error_from_response(siosl_area->response.code);
1324         if (rc)
1325                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1326                               schid.ssid, schid.sch_no,
1327                               siosl_area->response.code);
1328         else
1329                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1330                               schid.ssid, schid.sch_no);
1331 out:
1332         spin_unlock_irqrestore(&chsc_page_lock, flags);
1333         return rc;
1334 }
1335 EXPORT_SYMBOL_GPL(chsc_siosl);
1336
1337 /**
1338  * chsc_scm_info() - store SCM information (SSI)
1339  * @scm_area: request and response block for SSI
1340  * @token: continuation token
1341  *
1342  * Returns 0 on success.
1343  */
1344 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1345 {
1346         int ccode, ret;
1347
1348         memset(scm_area, 0, sizeof(*scm_area));
1349         scm_area->request.length = 0x0020;
1350         scm_area->request.code = 0x004C;
1351         scm_area->reqtok = token;
1352
1353         ccode = chsc(scm_area);
1354         if (ccode > 0) {
1355                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1356                 goto out;
1357         }
1358         ret = chsc_error_from_response(scm_area->response.code);
1359         if (ret != 0)
1360                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1361                               scm_area->response.code);
1362 out:
1363         return ret;
1364 }
1365 EXPORT_SYMBOL_GPL(chsc_scm_info);
1366
1367 /**
1368  * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info.
1369  * @schid:              id of the subchannel on which PNSO is performed
1370  * @brinfo_area:        request and response block for the operation
1371  * @resume_token:       resume token for multiblock response
1372  * @cnc:                Boolean change-notification control
1373  *
1374  * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1375  *
1376  * Returns 0 on success.
1377  */
1378 int chsc_pnso_brinfo(struct subchannel_id schid,
1379                 struct chsc_pnso_area *brinfo_area,
1380                 struct chsc_brinfo_resume_token resume_token,
1381                 int cnc)
1382 {
1383         memset(brinfo_area, 0, sizeof(*brinfo_area));
1384         brinfo_area->request.length = 0x0030;
1385         brinfo_area->request.code = 0x003d; /* network-subchannel operation */
1386         brinfo_area->m     = schid.m;
1387         brinfo_area->ssid  = schid.ssid;
1388         brinfo_area->sch   = schid.sch_no;
1389         brinfo_area->cssid = schid.cssid;
1390         brinfo_area->oc    = 0; /* Store-network-bridging-information list */
1391         brinfo_area->resume_token = resume_token;
1392         brinfo_area->n     = (cnc != 0);
1393         if (chsc(brinfo_area))
1394                 return -EIO;
1395         return chsc_error_from_response(brinfo_area->response.code);
1396 }
1397 EXPORT_SYMBOL_GPL(chsc_pnso_brinfo);
1398
1399 int chsc_sgib(u32 origin)
1400 {
1401         struct {
1402                 struct chsc_header request;
1403                 u16 op;
1404                 u8  reserved01[2];
1405                 u8  reserved02:4;
1406                 u8  fmt:4;
1407                 u8  reserved03[7];
1408                 /* operation data area begin */
1409                 u8  reserved04[4];
1410                 u32 gib_origin;
1411                 u8  reserved05[10];
1412                 u8  aix;
1413                 u8  reserved06[4029];
1414                 struct chsc_header response;
1415                 u8  reserved07[4];
1416         } *sgib_area;
1417         int ret;
1418
1419         spin_lock_irq(&chsc_page_lock);
1420         memset(chsc_page, 0, PAGE_SIZE);
1421         sgib_area = chsc_page;
1422         sgib_area->request.length = 0x0fe0;
1423         sgib_area->request.code = 0x0021;
1424         sgib_area->op = 0x1;
1425         sgib_area->gib_origin = origin;
1426
1427         ret = chsc(sgib_area);
1428         if (ret == 0)
1429                 ret = chsc_error_from_response(sgib_area->response.code);
1430         spin_unlock_irq(&chsc_page_lock);
1431
1432         return ret;
1433 }
1434 EXPORT_SYMBOL_GPL(chsc_sgib);