drivers/s390/cio/chsc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *   S/390 common I/O routines -- channel subsystem call
   4  *
   5  *    Copyright IBM Corp. 1999,2012
   6  *    Author(s): Ingo Adlung ([email protected])
   7  *               Cornelia Huck ([email protected])
   8  *               Arnd Bergmann ([email protected])
   9  */
  10
  11 #define KMSG_COMPONENT "cio"
  12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/init.h>
  17 #include <linux/device.h>
  18 #include <linux/mutex.h>
  19 #include <linux/pci.h>
  20
  21 #include <asm/cio.h>
  22 #include <asm/chpid.h>
  23 #include <asm/chsc.h>
  24 #include <asm/crw.h>
  25 #include <asm/isc.h>
  26 #include <asm/ebcdic.h>
  27
  28 #include "css.h"
  29 #include "cio.h"
  30 #include "cio_debug.h"
  31 #include "ioasm.h"
  32 #include "chp.h"
  33 #include "chsc.h"
  34
  35 static void *sei_page;
  36 static void *chsc_page;
  37 static DEFINE_SPINLOCK(chsc_page_lock);
  38
  39 #define SEI_VF_FLA      0xc0 /* VF flag for Full Link Address */
  40 #define SEI_RS_CHPID    0x4  /* 4 in RS field indicates CHPID */
  41
  42 static BLOCKING_NOTIFIER_HEAD(chsc_notifiers);
  43
  44 int chsc_notifier_register(struct notifier_block *nb)
  45 {
  46         return blocking_notifier_chain_register(&chsc_notifiers, nb);
  47 }
  48 EXPORT_SYMBOL(chsc_notifier_register);
  49
  50 int chsc_notifier_unregister(struct notifier_block *nb)
  51 {
  52         return blocking_notifier_chain_unregister(&chsc_notifiers, nb);
  53 }
  54 EXPORT_SYMBOL(chsc_notifier_unregister);
  55
  56 /**
  57  * chsc_error_from_response() - convert a chsc response to an error
  58  * @response: chsc response code
  59  *
  60  * Returns an appropriate Linux error code for @response.
  61  */
  62 int chsc_error_from_response(int response)
  63 {
  64         switch (response) {
  65         case 0x0001:
  66                 return 0;
  67         case 0x0002:
  68         case 0x0003:
  69         case 0x0006:
  70         case 0x0007:
  71         case 0x0008:
  72         case 0x000a:
  73         case 0x0104:
  74                 return -EINVAL;
  75         case 0x0004:
  76         case 0x0106:            /* "Wrong Channel Parm" for the op 0x003d */
  77                 return -EOPNOTSUPP;
  78         case 0x000b:
  79         case 0x0107:            /* "Channel busy" for the op 0x003d */
  80                 return -EBUSY;
  81         case 0x0100:
  82         case 0x0102:
  83                 return -ENOMEM;
  84         case 0x0108:            /* "HW limit exceeded" for the op 0x003d */
  85                 return -EUSERS;
  86         default:
  87                 return -EIO;
  88         }
  89 }
  90 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  91
  92 struct chsc_ssd_area {
  93         struct chsc_header request;
  94         u16 :10;
  95         u16 ssid:2;
  96         u16 :4;
  97         u16 f_sch;        /* first subchannel */
  98         u16 :16;
  99         u16 l_sch;        /* last subchannel */
 100         u32 :32;
 101         struct chsc_header response;
 102         u32 :32;
 103         u8 sch_valid : 1;
 104         u8 dev_valid : 1;
 105         u8 st        : 3; /* subchannel type */
 106         u8 zeroes    : 3;
 107         u8  unit_addr;    /* unit address */
 108         u16 devno;        /* device number */
 109         u8 path_mask;
 110         u8 fla_valid_mask;
 111         u16 sch;          /* subchannel */
 112         u8 chpid[8];      /* chpids 0-7 */
 113         u16 fla[8];       /* full link addresses 0-7 */
 114 } __packed __aligned(PAGE_SIZE);
 115
 116 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
 117 {
 118         struct chsc_ssd_area *ssd_area;
 119         unsigned long flags;
 120         int ccode;
 121         int ret;
 122         int i;
 123         int mask;
 124
 125         spin_lock_irqsave(&chsc_page_lock, flags);
 126         memset(chsc_page, 0, PAGE_SIZE);
 127         ssd_area = chsc_page;
 128         ssd_area->request.length = 0x0010;
 129         ssd_area->request.code = 0x0004;
 130         ssd_area->ssid = schid.ssid;
 131         ssd_area->f_sch = schid.sch_no;
 132         ssd_area->l_sch = schid.sch_no;
 133
 134         ccode = chsc(ssd_area);
 135         /* Check response. */
 136         if (ccode > 0) {
 137                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 138                 goto out;
 139         }
 140         ret = chsc_error_from_response(ssd_area->response.code);
 141         if (ret != 0) {
 142                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 143                               schid.ssid, schid.sch_no,
 144                               ssd_area->response.code);
 145                 goto out;
 146         }
 147         if (!ssd_area->sch_valid) {
 148                 ret = -ENODEV;
 149                 goto out;
 150         }
 151         /* Copy data */
 152         ret = 0;
 153         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 154         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 155             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 156                 goto out;
 157         ssd->path_mask = ssd_area->path_mask;
 158         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 159         for (i = 0; i < 8; i++) {
 160                 mask = 0x80 >> i;
 161                 if (ssd_area->path_mask & mask) {
 162                         chp_id_init(&ssd->chpid[i]);
 163                         ssd->chpid[i].id = ssd_area->chpid[i];
 164                 }
 165                 if (ssd_area->fla_valid_mask & mask)
 166                         ssd->fla[i] = ssd_area->fla[i];
 167         }
 168 out:
 169         spin_unlock_irqrestore(&chsc_page_lock, flags);
 170         return ret;
 171 }
 172
 173 /**
 174  * chsc_ssqd() - store subchannel QDIO data (SSQD)
 175  * @schid: id of the subchannel on which SSQD is performed
 176  * @ssqd: request and response block for SSQD
 177  *
 178  * Returns 0 on success.
 179  */
 180 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 181 {
 182         memset(ssqd, 0, sizeof(*ssqd));
 183         ssqd->request.length = 0x0010;
 184         ssqd->request.code = 0x0024;
 185         ssqd->first_sch = schid.sch_no;
 186         ssqd->last_sch = schid.sch_no;
 187         ssqd->ssid = schid.ssid;
 188
 189         if (chsc(ssqd))
 190                 return -EIO;
 191
 192         return chsc_error_from_response(ssqd->response.code);
 193 }
 194 EXPORT_SYMBOL_GPL(chsc_ssqd);
 195
 196 /**
 197  * chsc_sadc() - set adapter device controls (SADC)
 198  * @schid: id of the subchannel on which SADC is performed
 199  * @scssc: request and response block for SADC
 200  * @summary_indicator_addr: summary indicator address
 201  * @subchannel_indicator_addr: subchannel indicator address
 202  * @isc: Interruption Subclass for this subchannel
 203  *
 204  * Returns 0 on success.
 205  */
 206 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
 207               dma64_t summary_indicator_addr, dma64_t subchannel_indicator_addr, u8 isc)
 208 {
 209         memset(scssc, 0, sizeof(*scssc));
 210         scssc->request.length = 0x0fe0;
 211         scssc->request.code = 0x0021;
 212         scssc->operation_code = 0;
 213
 214         scssc->summary_indicator_addr = summary_indicator_addr;
 215         scssc->subchannel_indicator_addr = subchannel_indicator_addr;
 216
 217         scssc->ks = PAGE_DEFAULT_KEY >> 4;
 218         scssc->kc = PAGE_DEFAULT_KEY >> 4;
 219         scssc->isc = isc;
 220         scssc->schid = schid;
 221
 222         /* enable the time delay disablement facility */
 223         if (css_general_characteristics.aif_tdd)
 224                 scssc->word_with_d_bit = 0x10000000;
 225
 226         if (chsc(scssc))
 227                 return -EIO;
 228
 229         return chsc_error_from_response(scssc->response.code);
 230 }
 231 EXPORT_SYMBOL_GPL(chsc_sadc);
 232
 233 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 234 {
 235         spin_lock_irq(&sch->lock);
 236         if (sch->driver && sch->driver->chp_event)
 237                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 238                         goto out_unreg;
 239         spin_unlock_irq(&sch->lock);
 240         return 0;
 241
 242 out_unreg:
 243         sch->lpm = 0;
 244         spin_unlock_irq(&sch->lock);
 245         css_schedule_eval(sch->schid);
 246         return 0;
 247 }
 248
 249 void chsc_chp_offline(struct chp_id chpid)
 250 {
 251         struct channel_path *chp = chpid_to_chp(chpid);
 252         struct chp_link link;
 253         char dbf_txt[15];
 254
 255         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 256         CIO_TRACE_EVENT(2, dbf_txt);
 257
 258         if (chp_get_status(chpid) <= 0)
 259                 return;
 260         memset(&link, 0, sizeof(struct chp_link));
 261         link.chpid = chpid;
 262         /* Wait until previous actions have settled. */
 263         css_wait_for_slow_path();
 264
 265         mutex_lock(&chp->lock);
 266         chp_update_desc(chp);
 267         mutex_unlock(&chp->lock);
 268
 269         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 270 }
 271
 272 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 273 {
 274         spin_lock_irq(&sch->lock);
 275         if (sch->driver && sch->driver->chp_event)
 276                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 277         spin_unlock_irq(&sch->lock);
 278
 279         return 0;
 280 }
 281
 282 static void s390_process_res_acc(struct chp_link *link)
 283 {
 284         char dbf_txt[15];
 285
 286         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 287                 link->chpid.id);
 288         CIO_TRACE_EVENT( 2, dbf_txt);
 289         if (link->fla != 0) {
 290                 sprintf(dbf_txt, "fla%x", link->fla);
 291                 CIO_TRACE_EVENT( 2, dbf_txt);
 292         }
 293         /* Wait until previous actions have settled. */
 294         css_wait_for_slow_path();
 295         /*
 296          * I/O resources may have become accessible.
 297          * Scan through all subchannels that may be concerned and
 298          * do a validation on those.
 299          * The more information we have (info), the less scanning
 300          * will we have to do.
 301          */
 302         for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
 303         css_schedule_reprobe();
 304 }
 305
 306 static int process_fces_event(struct subchannel *sch, void *data)
 307 {
 308         spin_lock_irq(&sch->lock);
 309         if (sch->driver && sch->driver->chp_event)
 310                 sch->driver->chp_event(sch, data, CHP_FCES_EVENT);
 311         spin_unlock_irq(&sch->lock);
 312         return 0;
 313 }
 314
 315 struct chsc_sei_nt0_area {
 316         u8  flags;
 317         u8  vf;                         /* validity flags */
 318         u8  rs;                         /* reporting source */
 319         u8  cc;                         /* content code */
 320         u16 fla;                        /* full link address */
 321         u16 rsid;                       /* reporting source id */
 322         u32 reserved1;
 323         u32 reserved2;
 324         /* ccdf has to be big enough for a link-incident record */
 325         u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 326 } __packed;
 327
 328 struct chsc_sei_nt2_area {
 329         u8  flags;                      /* p and v bit */
 330         u8  reserved1;
 331         u8  reserved2;
 332         u8  cc;                         /* content code */
 333         u32 reserved3[13];
 334         u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 335 } __packed;
 336
 337 #define CHSC_SEI_NT0    (1ULL << 63)
 338 #define CHSC_SEI_NT2    (1ULL << 61)
 339
 340 struct chsc_sei {
 341         struct chsc_header request;
 342         u32 reserved1;
 343         u64 ntsm;                       /* notification type mask */
 344         struct chsc_header response;
 345         u32 :24;
 346         u8 nt;
 347         union {
 348                 struct chsc_sei_nt0_area nt0_area;
 349                 struct chsc_sei_nt2_area nt2_area;
 350                 u8 nt_area[PAGE_SIZE - 24];
 351         } u;
 352 } __packed __aligned(PAGE_SIZE);
 353
 354 /*
 355  * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
 356  */
 357
 358 #define LIR_IQ_CLASS_INFO               0
 359 #define LIR_IQ_CLASS_DEGRADED           1
 360 #define LIR_IQ_CLASS_NOT_OPERATIONAL    2
 361
 362 struct lir {
 363         struct {
 364                 u32 null:1;
 365                 u32 reserved:3;
 366                 u32 class:2;
 367                 u32 reserved2:2;
 368         } __packed iq;
 369         u32 ic:8;
 370         u32 reserved:16;
 371         struct node_descriptor incident_node;
 372         struct node_descriptor attached_node;
 373         u8 reserved2[32];
 374 } __packed;
 375
 376 #define PARAMS_LEN      10      /* PARAMS=xx,xxxxxx */
 377 #define NODEID_LEN      35      /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 378
 379 /* Copy EBCDIC text, convert to ASCII and optionally add delimiter. */
 380 static char *store_ebcdic(char *dest, const char *src, unsigned long len,
 381                           char delim)
 382 {
 383         memcpy(dest, src, len);
 384         EBCASC(dest, len);
 385
 386         if (delim)
 387                 dest[len++] = delim;
 388
 389         return dest + len;
 390 }
 391
 392 static void chsc_link_from_sei(struct chp_link *link,
 393                                 struct chsc_sei_nt0_area *sei_area)
 394 {
 395         if ((sei_area->vf & SEI_VF_FLA) != 0) {
 396                 link->fla       = sei_area->fla;
 397                 link->fla_mask  = ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ?
 398                                                         0xffff : 0xff00;
 399         }
 400 }
 401
 402 /* Format node ID and parameters for output in LIR log message. */
 403 static void format_node_data(char *params, char *id, struct node_descriptor *nd)
 404 {
 405         memset(params, 0, PARAMS_LEN);
 406         memset(id, 0, NODEID_LEN);
 407
 408         if (nd->validity != ND_VALIDITY_VALID) {
 409                 strscpy(params, "n/a", PARAMS_LEN);
 410                 strscpy(id, "n/a", NODEID_LEN);
 411                 return;
 412         }
 413
 414         /* PARAMS=xx,xxxxxx */
 415         snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
 416         /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
 417         id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
 418         id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
 419         id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
 420         id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
 421         id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
 422         sprintf(id, "%04X", nd->tag);
 423 }
 424
 425 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 426 {
 427         struct lir *lir = (struct lir *) &sei_area->ccdf;
 428         char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
 429              aunodeid[NODEID_LEN];
 430
 431         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
 432                       sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
 433
 434         /* Ignore NULL Link Incident Records. */
 435         if (lir->iq.null)
 436                 return;
 437
 438         /* Inform user that a link requires maintenance actions because it has
 439          * become degraded or not operational. Note that this log message is
 440          * the primary intention behind a Link Incident Record. */
 441
 442         format_node_data(iuparams, iunodeid, &lir->incident_node);
 443         format_node_data(auparams, aunodeid, &lir->attached_node);
 444
 445         switch (lir->iq.class) {
 446         case LIR_IQ_CLASS_DEGRADED:
 447                 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
 448                         "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 449                         sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 450                         iunodeid, auparams, aunodeid);
 451                 break;
 452         case LIR_IQ_CLASS_NOT_OPERATIONAL:
 453                 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
 454                        "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
 455                        sei_area->rs, sei_area->rsid, lir->ic, iuparams,
 456                        iunodeid, auparams, aunodeid);
 457                 break;
 458         default:
 459                 break;
 460         }
 461 }
 462
 463 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 464 {
 465         struct channel_path *chp;
 466         struct chp_link link;
 467         struct chp_id chpid;
 468         int status;
 469
 470         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 471                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 472         if (sei_area->rs != 4)
 473                 return;
 474         chp_id_init(&chpid);
 475         chpid.id = sei_area->rsid;
 476         /* allocate a new channel path structure, if needed */
 477         status = chp_get_status(chpid);
 478         if (!status)
 479                 return;
 480
 481         if (status < 0) {
 482                 chp_new(chpid);
 483         } else {
 484                 chp = chpid_to_chp(chpid);
 485                 mutex_lock(&chp->lock);
 486                 chp_update_desc(chp);
 487                 mutex_unlock(&chp->lock);
 488         }
 489         memset(&link, 0, sizeof(struct chp_link));
 490         link.chpid = chpid;
 491         chsc_link_from_sei(&link, sei_area);
 492         s390_process_res_acc(&link);
 493 }
 494
 495 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 496 {
 497         struct channel_path *chp;
 498         struct chp_id chpid;
 499         u8 *data;
 500         int num;
 501
 502         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 503         if (sei_area->rs != 0)
 504                 return;
 505         data = sei_area->ccdf;
 506         chp_id_init(&chpid);
 507         for (num = 0; num <= __MAX_CHPID; num++) {
 508                 if (!chp_test_bit(data, num))
 509                         continue;
 510                 chpid.id = num;
 511
 512                 CIO_CRW_EVENT(4, "Update information for channel path "
 513                               "%x.%02x\n", chpid.cssid, chpid.id);
 514                 chp = chpid_to_chp(chpid);
 515                 if (!chp) {
 516                         chp_new(chpid);
 517                         continue;
 518                 }
 519                 mutex_lock(&chp->lock);
 520                 chp_update_desc(chp);
 521                 mutex_unlock(&chp->lock);
 522         }
 523 }
 524
 525 struct chp_config_data {
 526         u8 map[32];
 527         u8 op;
 528         u8 pc;
 529 };
 530
 531 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 532 {
 533         struct chp_config_data *data;
 534         struct chp_id chpid;
 535         int num;
 536         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 537
 538         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 539         if (sei_area->rs != 0)
 540                 return;
 541         data = (struct chp_config_data *) &(sei_area->ccdf);
 542         chp_id_init(&chpid);
 543         for (num = 0; num <= __MAX_CHPID; num++) {
 544                 if (!chp_test_bit(data->map, num))
 545                         continue;
 546                 chpid.id = num;
 547                 pr_notice("Processing %s for channel path %x.%02x\n",
 548                           events[data->op], chpid.cssid, chpid.id);
 549                 switch (data->op) {
 550                 case 0:
 551                         chp_cfg_schedule(chpid, 1);
 552                         break;
 553                 case 1:
 554                         chp_cfg_schedule(chpid, 0);
 555                         break;
 556                 case 2:
 557                         chp_cfg_cancel_deconfigure(chpid);
 558                         break;
 559                 }
 560         }
 561 }
 562
 563 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 564 {
 565         int ret;
 566
 567         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 568         if (sei_area->rs != 7)
 569                 return;
 570
 571         ret = scm_update_information();
 572         if (ret)
 573                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 574                               " failed (rc=%d).\n", ret);
 575 }
 576
 577 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 578 {
 579         int ret;
 580
 581         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 582         if (sei_area->rs != 7)
 583                 return;
 584
 585         ret = scm_process_availability_information();
 586         if (ret)
 587                 CIO_CRW_EVENT(0, "chsc: process availability information"
 588                               " failed (rc=%d).\n", ret);
 589 }
 590
 591 static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
 592 {
 593         CIO_CRW_EVENT(3, "chsc: ap config changed\n");
 594         if (sei_area->rs != 5)
 595                 return;
 596
 597         blocking_notifier_call_chain(&chsc_notifiers,
 598                                      CHSC_NOTIFY_AP_CFG, NULL);
 599 }
 600
 601 static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area)
 602 {
 603         struct chp_link link;
 604         struct chp_id chpid;
 605         struct channel_path *chp;
 606
 607         CIO_CRW_EVENT(4,
 608         "chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n",
 609                 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
 610
 611         if (sei_area->rs != SEI_RS_CHPID)
 612                 return;
 613         chp_id_init(&chpid);
 614         chpid.id = sei_area->rsid;
 615
 616         /* Ignore the event on unknown/invalid chp */
 617         chp = chpid_to_chp(chpid);
 618         if (!chp)
 619                 return;
 620
 621         memset(&link, 0, sizeof(struct chp_link));
 622         link.chpid = chpid;
 623         chsc_link_from_sei(&link, sei_area);
 624
 625         for_each_subchannel_staged(process_fces_event, NULL, &link);
 626 }
 627
 628 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 629 {
 630         switch (sei_area->cc) {
 631         case 1:
 632                 zpci_event_error(sei_area->ccdf);
 633                 break;
 634         case 2:
 635                 zpci_event_availability(sei_area->ccdf);
 636                 break;
 637         default:
 638                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 639                               sei_area->cc);
 640                 break;
 641         }
 642 }
 643
 644 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 645 {
 646         /* which kind of information was stored? */
 647         switch (sei_area->cc) {
 648         case 1: /* link incident*/
 649                 chsc_process_sei_link_incident(sei_area);
 650                 break;
 651         case 2: /* i/o resource accessibility */
 652                 chsc_process_sei_res_acc(sei_area);
 653                 break;
 654         case 3: /* ap config changed */
 655                 chsc_process_sei_ap_cfg_chg(sei_area);
 656                 break;
 657         case 7: /* channel-path-availability information */
 658                 chsc_process_sei_chp_avail(sei_area);
 659                 break;
 660         case 8: /* channel-path-configuration notification */
 661                 chsc_process_sei_chp_config(sei_area);
 662                 break;
 663         case 12: /* scm change notification */
 664                 chsc_process_sei_scm_change(sei_area);
 665                 break;
 666         case 14: /* scm available notification */
 667                 chsc_process_sei_scm_avail(sei_area);
 668                 break;
 669         case 15: /* FCES event notification */
 670                 chsc_process_sei_fces_event(sei_area);
 671                 break;
 672         default: /* other stuff */
 673                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 674                               sei_area->cc);
 675                 break;
 676         }
 677
 678         /* Check if we might have lost some information. */
 679         if (sei_area->flags & 0x40) {
 680                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 681                 css_schedule_eval_all();
 682         }
 683 }
 684
 685 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 686 {
 687         static int ntsm_unsupported;
 688
 689         while (true) {
 690                 memset(sei, 0, sizeof(*sei));
 691                 sei->request.length = 0x0010;
 692                 sei->request.code = 0x000e;
 693                 if (!ntsm_unsupported)
 694                         sei->ntsm = ntsm;
 695
 696                 if (chsc(sei))
 697                         break;
 698
 699                 if (sei->response.code != 0x0001) {
 700                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
 701                                       sei->response.code, sei->ntsm);
 702
 703                         if (sei->response.code == 3 && sei->ntsm) {
 704                                 /* Fallback for old firmware. */
 705                                 ntsm_unsupported = 1;
 706                                 continue;
 707                         }
 708                         break;
 709                 }
 710
 711                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 712                 switch (sei->nt) {
 713                 case 0:
 714                         chsc_process_sei_nt0(&sei->u.nt0_area);
 715                         break;
 716                 case 2:
 717                         chsc_process_sei_nt2(&sei->u.nt2_area);
 718                         break;
 719                 default:
 720                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 721                         break;
 722                 }
 723
 724                 if (!(sei->u.nt0_area.flags & 0x80))
 725                         break;
 726         }
 727 }
 728
 729 /*
 730  * Handle channel subsystem related CRWs.
 731  * Use store event information to find out what's going on.
 732  *
 733  * Note: Access to sei_page is serialized through machine check handler
 734  * thread, so no need for locking.
 735  */
 736 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 737 {
 738         struct chsc_sei *sei = sei_page;
 739
 740         if (overflow) {
 741                 css_schedule_eval_all();
 742                 return;
 743         }
 744         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 745                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 746                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 747                       crw0->erc, crw0->rsid);
 748
 749         CIO_TRACE_EVENT(2, "prcss");
 750         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 751 }
 752
 753 void chsc_chp_online(struct chp_id chpid)
 754 {
 755         struct channel_path *chp = chpid_to_chp(chpid);
 756         struct chp_link link;
 757         char dbf_txt[15];
 758
 759         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 760         CIO_TRACE_EVENT(2, dbf_txt);
 761
 762         if (chp_get_status(chpid) != 0) {
 763                 memset(&link, 0, sizeof(struct chp_link));
 764                 link.chpid = chpid;
 765                 /* Wait until previous actions have settled. */
 766                 css_wait_for_slow_path();
 767
 768                 mutex_lock(&chp->lock);
 769                 chp_update_desc(chp);
 770                 mutex_unlock(&chp->lock);
 771
 772                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 773                                            &link);
 774                 css_schedule_reprobe();
 775         }
 776 }
 777
 778 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 779                                          struct chp_id chpid, int on)
 780 {
 781         unsigned long flags;
 782         struct chp_link link;
 783
 784         memset(&link, 0, sizeof(struct chp_link));
 785         link.chpid = chpid;
 786         spin_lock_irqsave(&sch->lock, flags);
 787         if (sch->driver && sch->driver->chp_event)
 788                 sch->driver->chp_event(sch, &link,
 789                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 790         spin_unlock_irqrestore(&sch->lock, flags);
 791 }
 792
 793 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 794 {
 795         struct chp_id *chpid = data;
 796
 797         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 798         return 0;
 799 }
 800
 801 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 802 {
 803         struct chp_id *chpid = data;
 804
 805         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 806         return 0;
 807 }
 808
 809 /**
 810  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 811  * @chpid: channl-path ID
 812  * @on: non-zero for vary online, zero for vary offline
 813  */
 814 int chsc_chp_vary(struct chp_id chpid, int on)
 815 {
 816         struct channel_path *chp = chpid_to_chp(chpid);
 817
 818         /*
 819          * Redo PathVerification on the devices the chpid connects to
 820          */
 821         if (on) {
 822                 /* Try to update the channel path description. */
 823                 chp_update_desc(chp);
 824                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 825                                            NULL, &chpid);
 826                 css_schedule_reprobe();
 827         } else
 828                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 829                                            NULL, &chpid);
 830
 831         return 0;
 832 }
 833
 834 static void
 835 chsc_remove_cmg_attr(struct channel_subsystem *css)
 836 {
 837         int i;
 838
 839         for (i = 0; i <= __MAX_CHPID; i++) {
 840                 if (!css->chps[i])
 841                         continue;
 842                 chp_remove_cmg_attr(css->chps[i]);
 843         }
 844 }
 845
 846 static int
 847 chsc_add_cmg_attr(struct channel_subsystem *css)
 848 {
 849         int i, ret;
 850
 851         ret = 0;
 852         for (i = 0; i <= __MAX_CHPID; i++) {
 853                 if (!css->chps[i])
 854                         continue;
 855                 ret = chp_add_cmg_attr(css->chps[i]);
 856                 if (ret)
 857                         goto cleanup;
 858         }
 859         return ret;
 860 cleanup:
 861         while (i--) {
 862                 if (!css->chps[i])
 863                         continue;
 864                 chp_remove_cmg_attr(css->chps[i]);
 865         }
 866         return ret;
 867 }
 868
 869 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 870 {
 871         struct {
 872                 struct chsc_header request;
 873                 u32 operation_code : 2;
 874                 u32 : 1;
 875                 u32 e : 1;
 876                 u32 : 28;
 877                 u32 key : 4;
 878                 u32 : 28;
 879                 dma64_t cub[CSS_NUM_CUB_PAGES];
 880                 dma64_t ecub[CSS_NUM_ECUB_PAGES];
 881                 u32 reserved[5];
 882                 struct chsc_header response;
 883                 u32 status : 8;
 884                 u32 : 4;
 885                 u32 fmt : 4;
 886                 u32 : 16;
 887         } __packed *secm_area;
 888         unsigned long flags;
 889         int ret, ccode, i;
 890
 891         spin_lock_irqsave(&chsc_page_lock, flags);
 892         memset(chsc_page, 0, PAGE_SIZE);
 893         secm_area = chsc_page;
 894         secm_area->request.length = 0x0050;
 895         secm_area->request.code = 0x0016;
 896
 897         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 898         secm_area->e = 1;
 899
 900         for (i = 0; i < CSS_NUM_CUB_PAGES; i++)
 901                 secm_area->cub[i] = (__force dma64_t)virt_to_dma32(css->cub[i]);
 902         for (i = 0; i < CSS_NUM_ECUB_PAGES; i++)
 903                 secm_area->ecub[i] = virt_to_dma64(css->ecub[i]);
 904
 905         secm_area->operation_code = enable ? 0 : 1;
 906
 907         ccode = chsc(secm_area);
 908         if (ccode > 0) {
 909                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 910                 goto out;
 911         }
 912
 913         switch (secm_area->response.code) {
 914         case 0x0102:
 915         case 0x0103:
 916                 ret = -EINVAL;
 917                 break;
 918         default:
 919                 ret = chsc_error_from_response(secm_area->response.code);
 920         }
 921         if (ret != 0)
 922                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 923                               secm_area->response.code);
 924 out:
 925         spin_unlock_irqrestore(&chsc_page_lock, flags);
 926         return ret;
 927 }
 928
 929 static int cub_alloc(struct channel_subsystem *css)
 930 {
 931         int i;
 932
 933         for (i = 0; i < CSS_NUM_CUB_PAGES; i++) {
 934                 css->cub[i] = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 935                 if (!css->cub[i])
 936                         return -ENOMEM;
 937         }
 938         for (i = 0; i < CSS_NUM_ECUB_PAGES; i++) {
 939                 css->ecub[i] = (void *)get_zeroed_page(GFP_KERNEL);
 940                 if (!css->ecub[i])
 941                         return -ENOMEM;
 942         }
 943
 944         return 0;
 945 }
 946
 947 static void cub_free(struct channel_subsystem *css)
 948 {
 949         int i;
 950
 951         for (i = 0; i < CSS_NUM_CUB_PAGES; i++) {
 952                 free_page((unsigned long)css->cub[i]);
 953                 css->cub[i] = NULL;
 954         }
 955         for (i = 0; i < CSS_NUM_ECUB_PAGES; i++) {
 956                 free_page((unsigned long)css->ecub[i]);
 957                 css->ecub[i] = NULL;
 958         }
 959 }
 960
 961 int
 962 chsc_secm(struct channel_subsystem *css, int enable)
 963 {
 964         int ret;
 965
 966         if (enable && !css->cm_enabled) {
 967                 ret = cub_alloc(css);
 968                 if (ret)
 969                         goto out;
 970         }
 971         ret = __chsc_do_secm(css, enable);
 972         if (!ret) {
 973                 css->cm_enabled = enable;
 974                 if (css->cm_enabled) {
 975                         ret = chsc_add_cmg_attr(css);
 976                         if (ret) {
 977                                 __chsc_do_secm(css, 0);
 978                                 css->cm_enabled = 0;
 979                         }
 980                 } else
 981                         chsc_remove_cmg_attr(css);
 982         }
 983
 984 out:
 985         if (!css->cm_enabled)
 986                 cub_free(css);
 987
 988         return ret;
 989 }
 990
 991 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 992                                      int c, int m, void *page)
 993 {
 994         struct chsc_scpd *scpd_area;
 995         int ccode, ret;
 996
 997         if ((rfmt == 1 || rfmt == 0) && c == 1 &&
 998             !css_general_characteristics.fcs)
 999                 return -EINVAL;
1000         if ((rfmt == 2) && !css_general_characteristics.cib)
1001                 return -EINVAL;
1002         if ((rfmt == 3) && !css_general_characteristics.util_str)
1003                 return -EINVAL;
1004
1005         memset(page, 0, PAGE_SIZE);
1006         scpd_area = page;
1007         scpd_area->request.length = 0x0010;
1008         scpd_area->request.code = 0x0002;
1009         scpd_area->cssid = chpid.cssid;
1010         scpd_area->first_chpid = chpid.id;
1011         scpd_area->last_chpid = chpid.id;
1012         scpd_area->m = m;
1013         scpd_area->c = c;
1014         scpd_area->fmt = fmt;
1015         scpd_area->rfmt = rfmt;
1016
1017         ccode = chsc(scpd_area);
1018         if (ccode > 0)
1019                 return (ccode == 3) ? -ENODEV : -EBUSY;
1020
1021         ret = chsc_error_from_response(scpd_area->response.code);
1022         if (ret)
1023                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
1024                               scpd_area->response.code);
1025         return ret;
1026 }
1027 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
1028
1029 #define chsc_det_chp_desc(FMT, c)                                       \
1030 int chsc_determine_fmt##FMT##_channel_path_desc(                        \
1031         struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc)   \
1032 {                                                                       \
1033         struct chsc_scpd *scpd_area;                                    \
1034         unsigned long flags;                                            \
1035         int ret;                                                        \
1036                                                                         \
1037         spin_lock_irqsave(&chsc_page_lock, flags);                      \
1038         scpd_area = chsc_page;                                          \
1039         ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0,     \
1040                                                scpd_area);              \
1041         if (ret)                                                        \
1042                 goto out;                                               \
1043                                                                         \
1044         memcpy(desc, scpd_area->data, sizeof(*desc));                   \
1045 out:                                                                    \
1046         spin_unlock_irqrestore(&chsc_page_lock, flags);                 \
1047         return ret;                                                     \
1048 }
1049
1050 chsc_det_chp_desc(0, 0)
1051 chsc_det_chp_desc(1, 1)
1052 chsc_det_chp_desc(3, 0)
1053
1054 static void
1055 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
1056                           struct cmg_chars *chars)
1057 {
1058         int i, mask;
1059
1060         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
1061                 mask = 0x80 >> (i + 3);
1062                 if (cmcv & mask)
1063                         chp->cmg_chars.values[i] = chars->values[i];
1064                 else
1065                         chp->cmg_chars.values[i] = 0;
1066         }
1067 }
1068
1069 static unsigned long scmc_get_speed(u32 s, u32 p)
1070 {
1071         unsigned long speed = s;
1072
1073         if (!p)
1074                 p = 8;
1075         while (p--)
1076                 speed *= 10;
1077
1078         return speed;
1079 }
1080
1081 int chsc_get_channel_measurement_chars(struct channel_path *chp)
1082 {
1083         unsigned long flags;
1084         int ccode, ret;
1085
1086         struct {
1087                 struct chsc_header request;
1088                 u32 : 24;
1089                 u32 first_chpid : 8;
1090                 u32 : 24;
1091                 u32 last_chpid : 8;
1092                 u32 zeroes1;
1093                 struct chsc_header response;
1094                 u32 zeroes2;
1095                 struct cmg_cmcb cmcb;
1096         } *scmc_area;
1097
1098         chp->shared = -1;
1099         chp->cmg = -1;
1100         chp->extended = 0;
1101         chp->speed = 0;
1102
1103         if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1104                 return -EINVAL;
1105
1106         spin_lock_irqsave(&chsc_page_lock, flags);
1107         memset(chsc_page, 0, PAGE_SIZE);
1108         scmc_area = chsc_page;
1109         scmc_area->request.length = 0x0010;
1110         scmc_area->request.code = 0x0022;
1111         scmc_area->first_chpid = chp->chpid.id;
1112         scmc_area->last_chpid = chp->chpid.id;
1113
1114         ccode = chsc(scmc_area);
1115         if (ccode > 0) {
1116                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1117                 goto out;
1118         }
1119
1120         ret = chsc_error_from_response(scmc_area->response.code);
1121         if (ret) {
1122                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1123                               scmc_area->response.code);
1124                 goto out;
1125         }
1126         chp->cmcb = scmc_area->cmcb;
1127         if (scmc_area->cmcb.not_valid)
1128                 goto out;
1129
1130         chp->cmg = scmc_area->cmcb.cmg;
1131         chp->shared = scmc_area->cmcb.shared;
1132         chp->extended = scmc_area->cmcb.extended;
1133         chp->speed = scmc_get_speed(scmc_area->cmcb.cmgs, scmc_area->cmcb.cmgp);
1134         chsc_initialize_cmg_chars(chp, scmc_area->cmcb.cmcv,
1135                                   (struct cmg_chars *)&scmc_area->cmcb.data);
1136 out:
1137         spin_unlock_irqrestore(&chsc_page_lock, flags);
1138         return ret;
1139 }
1140
1141 int __init chsc_init(void)
1142 {
1143         int ret;
1144
1145         sei_page = (void *)get_zeroed_page(GFP_KERNEL);
1146         chsc_page = (void *)get_zeroed_page(GFP_KERNEL);
1147         if (!sei_page || !chsc_page) {
1148                 ret = -ENOMEM;
1149                 goto out_err;
1150         }
1151         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1152         if (ret)
1153                 goto out_err;
1154         return ret;
1155 out_err:
1156         free_page((unsigned long)chsc_page);
1157         free_page((unsigned long)sei_page);
1158         return ret;
1159 }
1160
1161 void __init chsc_init_cleanup(void)
1162 {
1163         crw_unregister_handler(CRW_RSC_CSS);
1164         free_page((unsigned long)chsc_page);
1165         free_page((unsigned long)sei_page);
1166 }
1167
1168 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1169 {
1170         int ret;
1171
1172         sda_area->request.length = 0x0400;
1173         sda_area->request.code = 0x0031;
1174         sda_area->operation_code = operation_code;
1175
1176         ret = chsc(sda_area);
1177         if (ret > 0) {
1178                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1179                 goto out;
1180         }
1181
1182         switch (sda_area->response.code) {
1183         case 0x0101:
1184                 ret = -EOPNOTSUPP;
1185                 break;
1186         default:
1187                 ret = chsc_error_from_response(sda_area->response.code);
1188         }
1189 out:
1190         return ret;
1191 }
1192
1193 int chsc_enable_facility(int operation_code)
1194 {
1195         struct chsc_sda_area *sda_area;
1196         unsigned long flags;
1197         int ret;
1198
1199         spin_lock_irqsave(&chsc_page_lock, flags);
1200         memset(chsc_page, 0, PAGE_SIZE);
1201         sda_area = chsc_page;
1202
1203         ret = __chsc_enable_facility(sda_area, operation_code);
1204         if (ret != 0)
1205                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1206                               operation_code, sda_area->response.code);
1207
1208         spin_unlock_irqrestore(&chsc_page_lock, flags);
1209         return ret;
1210 }
1211
1212 int __init chsc_get_cssid_iid(int idx, u8 *cssid, u8 *iid)
1213 {
1214         struct {
1215                 struct chsc_header request;
1216                 u8 atype;
1217                 u32 : 24;
1218                 u32 reserved1[6];
1219                 struct chsc_header response;
1220                 u32 reserved2[3];
1221                 struct {
1222                         u8 cssid;
1223                         u8 iid;
1224                         u32 : 16;
1225                 } list[];
1226         } *sdcal_area;
1227         int ret;
1228
1229         spin_lock_irq(&chsc_page_lock);
1230         memset(chsc_page, 0, PAGE_SIZE);
1231         sdcal_area = chsc_page;
1232         sdcal_area->request.length = 0x0020;
1233         sdcal_area->request.code = 0x0034;
1234         sdcal_area->atype = 4;
1235
1236         ret = chsc(sdcal_area);
1237         if (ret) {
1238                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1239                 goto exit;
1240         }
1241
1242         ret = chsc_error_from_response(sdcal_area->response.code);
1243         if (ret) {
1244                 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
1245                               sdcal_area->response.code);
1246                 goto exit;
1247         }
1248
1249         if ((addr_t) &sdcal_area->list[idx] <
1250             (addr_t) &sdcal_area->response + sdcal_area->response.length) {
1251                 *cssid = sdcal_area->list[idx].cssid;
1252                 *iid = sdcal_area->list[idx].iid;
1253         }
1254         else
1255                 ret = -ENODEV;
1256 exit:
1257         spin_unlock_irq(&chsc_page_lock);
1258         return ret;
1259 }
1260
1261 struct css_general_char css_general_characteristics;
1262 struct css_chsc_char css_chsc_characteristics;
1263
1264 int __init
1265 chsc_determine_css_characteristics(void)
1266 {
1267         unsigned long flags;
1268         int result;
1269         struct {
1270                 struct chsc_header request;
1271                 u32 reserved1;
1272                 u32 reserved2;
1273                 u32 reserved3;
1274                 struct chsc_header response;
1275                 u32 reserved4;
1276                 u32 general_char[510];
1277                 u32 chsc_char[508];
1278         } *scsc_area;
1279
1280         spin_lock_irqsave(&chsc_page_lock, flags);
1281         memset(chsc_page, 0, PAGE_SIZE);
1282         scsc_area = chsc_page;
1283         scsc_area->request.length = 0x0010;
1284         scsc_area->request.code = 0x0010;
1285
1286         result = chsc(scsc_area);
1287         if (result) {
1288                 result = (result == 3) ? -ENODEV : -EBUSY;
1289                 goto exit;
1290         }
1291
1292         result = chsc_error_from_response(scsc_area->response.code);
1293         if (result == 0) {
1294                 memcpy(&css_general_characteristics, scsc_area->general_char,
1295                        sizeof(css_general_characteristics));
1296                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1297                        sizeof(css_chsc_characteristics));
1298         } else
1299                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1300                               scsc_area->response.code);
1301 exit:
1302         spin_unlock_irqrestore(&chsc_page_lock, flags);
1303         return result;
1304 }
1305
1306 EXPORT_SYMBOL_GPL(css_general_characteristics);
1307 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1308
1309 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta)
1310 {
1311         struct {
1312                 struct chsc_header request;
1313                 unsigned int rsvd0;
1314                 unsigned int op : 8;
1315                 unsigned int rsvd1 : 8;
1316                 unsigned int ctrl : 16;
1317                 unsigned int rsvd2[5];
1318                 struct chsc_header response;
1319                 unsigned int rsvd3[3];
1320                 s64 clock_delta;
1321                 unsigned int rsvd4[2];
1322         } *rr;
1323         int rc;
1324
1325         memset(page, 0, PAGE_SIZE);
1326         rr = page;
1327         rr->request.length = 0x0020;
1328         rr->request.code = 0x0033;
1329         rr->op = op;
1330         rr->ctrl = ctrl;
1331         rc = chsc(rr);
1332         if (rc)
1333                 return -EIO;
1334         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1335         if (clock_delta)
1336                 *clock_delta = rr->clock_delta;
1337         return rc;
1338 }
1339
1340 int chsc_sstpi(void *page, void *result, size_t size)
1341 {
1342         struct {
1343                 struct chsc_header request;
1344                 unsigned int rsvd0[3];
1345                 struct chsc_header response;
1346                 char data[];
1347         } *rr;
1348         int rc;
1349
1350         memset(page, 0, PAGE_SIZE);
1351         rr = page;
1352         rr->request.length = 0x0010;
1353         rr->request.code = 0x0038;
1354         rc = chsc(rr);
1355         if (rc)
1356                 return -EIO;
1357         memcpy(result, &rr->data, size);
1358         return (rr->response.code == 0x0001) ? 0 : -EIO;
1359 }
1360
1361 int chsc_stzi(void *page, void *result, size_t size)
1362 {
1363         struct {
1364                 struct chsc_header request;
1365                 unsigned int rsvd0[3];
1366                 struct chsc_header response;
1367                 char data[];
1368         } *rr;
1369         int rc;
1370
1371         memset(page, 0, PAGE_SIZE);
1372         rr = page;
1373         rr->request.length = 0x0010;
1374         rr->request.code = 0x003e;
1375         rc = chsc(rr);
1376         if (rc)
1377                 return -EIO;
1378         memcpy(result, &rr->data, size);
1379         return (rr->response.code == 0x0001) ? 0 : -EIO;
1380 }
1381
1382 int chsc_siosl(struct subchannel_id schid)
1383 {
1384         struct {
1385                 struct chsc_header request;
1386                 u32 word1;
1387                 struct subchannel_id sid;
1388                 u32 word3;
1389                 struct chsc_header response;
1390                 u32 word[11];
1391         } *siosl_area;
1392         unsigned long flags;
1393         int ccode;
1394         int rc;
1395
1396         spin_lock_irqsave(&chsc_page_lock, flags);
1397         memset(chsc_page, 0, PAGE_SIZE);
1398         siosl_area = chsc_page;
1399         siosl_area->request.length = 0x0010;
1400         siosl_area->request.code = 0x0046;
1401         siosl_area->word1 = 0x80000000;
1402         siosl_area->sid = schid;
1403
1404         ccode = chsc(siosl_area);
1405         if (ccode > 0) {
1406                 if (ccode == 3)
1407                         rc = -ENODEV;
1408                 else
1409                         rc = -EBUSY;
1410                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1411                               schid.ssid, schid.sch_no, ccode);
1412                 goto out;
1413         }
1414         rc = chsc_error_from_response(siosl_area->response.code);
1415         if (rc)
1416                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1417                               schid.ssid, schid.sch_no,
1418                               siosl_area->response.code);
1419         else
1420                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1421                               schid.ssid, schid.sch_no);
1422 out:
1423         spin_unlock_irqrestore(&chsc_page_lock, flags);
1424         return rc;
1425 }
1426 EXPORT_SYMBOL_GPL(chsc_siosl);
1427
1428 /**
1429  * chsc_scm_info() - store SCM information (SSI)
1430  * @scm_area: request and response block for SSI
1431  * @token: continuation token
1432  *
1433  * Returns 0 on success.
1434  */
1435 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1436 {
1437         int ccode, ret;
1438
1439         memset(scm_area, 0, sizeof(*scm_area));
1440         scm_area->request.length = 0x0020;
1441         scm_area->request.code = 0x004C;
1442         scm_area->reqtok = token;
1443
1444         ccode = chsc(scm_area);
1445         if (ccode > 0) {
1446                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1447                 goto out;
1448         }
1449         ret = chsc_error_from_response(scm_area->response.code);
1450         if (ret != 0)
1451                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1452                               scm_area->response.code);
1453 out:
1454         return ret;
1455 }
1456 EXPORT_SYMBOL_GPL(chsc_scm_info);
1457
1458 /**
1459  * chsc_pnso() - Perform Network-Subchannel Operation
1460  * @schid:              id of the subchannel on which PNSO is performed
1461  * @pnso_area:          request and response block for the operation
1462  * @oc:                 Operation Code
1463  * @resume_token:       resume token for multiblock response
1464  * @cnc:                Boolean change-notification control
1465  *
1466  * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1467  *
1468  * Returns 0 on success.
1469  */
1470 int chsc_pnso(struct subchannel_id schid, struct chsc_pnso_area *pnso_area,
1471               u8 oc, struct chsc_pnso_resume_token resume_token, int cnc)
1472 {
1473         memset(pnso_area, 0, sizeof(*pnso_area));
1474         pnso_area->request.length = 0x0030;
1475         pnso_area->request.code = 0x003d; /* network-subchannel operation */
1476         pnso_area->m       = schid.m;
1477         pnso_area->ssid  = schid.ssid;
1478         pnso_area->sch   = schid.sch_no;
1479         pnso_area->cssid = schid.cssid;
1480         pnso_area->oc    = oc;
1481         pnso_area->resume_token = resume_token;
1482         pnso_area->n       = (cnc != 0);
1483         if (chsc(pnso_area))
1484                 return -EIO;
1485         return chsc_error_from_response(pnso_area->response.code);
1486 }
1487
1488 int chsc_sgib(u32 origin)
1489 {
1490         struct {
1491                 struct chsc_header request;
1492                 u16 op;
1493                 u8  reserved01[2];
1494                 u8  reserved02:4;
1495                 u8  fmt:4;
1496                 u8  reserved03[7];
1497                 /* operation data area begin */
1498                 u8  reserved04[4];
1499                 u32 gib_origin;
1500                 u8  reserved05[10];
1501                 u8  aix;
1502                 u8  reserved06[4029];
1503                 struct chsc_header response;
1504                 u8  reserved07[4];
1505         } *sgib_area;
1506         int ret;
1507
1508         spin_lock_irq(&chsc_page_lock);
1509         memset(chsc_page, 0, PAGE_SIZE);
1510         sgib_area = chsc_page;
1511         sgib_area->request.length = 0x0fe0;
1512         sgib_area->request.code = 0x0021;
1513         sgib_area->op = 0x1;
1514         sgib_area->gib_origin = origin;
1515
1516         ret = chsc(sgib_area);
1517         if (ret == 0)
1518                 ret = chsc_error_from_response(sgib_area->response.code);
1519         spin_unlock_irq(&chsc_page_lock);
1520
1521         return ret;
1522 }
1523 EXPORT_SYMBOL_GPL(chsc_sgib);
1524
1525 #define SCUD_REQ_LEN    0x10 /* SCUD request block length */
1526 #define SCUD_REQ_CMD    0x4b /* SCUD Command Code */
1527
1528 struct chse_cudb {
1529         u16 flags:8;
1530         u16 chp_valid:8;
1531         u16 cu;
1532         u32 esm_valid:8;
1533         u32:24;
1534         u8 chpid[8];
1535         u32:32;
1536         u32:32;
1537         u8 esm[8];
1538         u32 efla[8];
1539 } __packed;
1540
1541 struct chsc_scud {
1542         struct chsc_header request;
1543         u16:4;
1544         u16 fmt:4;
1545         u16 cssid:8;
1546         u16 first_cu;
1547         u16:16;
1548         u16 last_cu;
1549         u32:32;
1550         struct chsc_header response;
1551         u16:4;
1552         u16 fmt_resp:4;
1553         u32:24;
1554         struct chse_cudb cudb[];
1555 } __packed;
1556
1557 /**
1558  * chsc_scud() - Store control-unit description.
1559  * @cu:         number of the control-unit
1560  * @esm:        8 1-byte endpoint security mode values
1561  * @esm_valid:  validity mask for @esm
1562  *
1563  * Interface to retrieve information about the endpoint security
1564  * modes for up to 8 paths of a control unit.
1565  *
1566  * Returns 0 on success.
1567  */
1568 int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid)
1569 {
1570         struct chsc_scud *scud = chsc_page;
1571         int ret;
1572
1573         spin_lock_irq(&chsc_page_lock);
1574         memset(chsc_page, 0, PAGE_SIZE);
1575         scud->request.length = SCUD_REQ_LEN;
1576         scud->request.code = SCUD_REQ_CMD;
1577         scud->fmt = 0;
1578         scud->cssid = 0;
1579         scud->first_cu = cu;
1580         scud->last_cu = cu;
1581
1582         ret = chsc(scud);
1583         if (!ret)
1584                 ret = chsc_error_from_response(scud->response.code);
1585
1586         if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0
1587                         || !(scud->cudb[0].flags & 0x80)
1588                         || scud->cudb[0].cu != cu)) {
1589
1590                 CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x "
1591                         "FMT=%04x, cudb.flags=%02x, cudb.cu=%04x",
1592                         scud->response.code, scud->response.length,
1593                         scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu);
1594                 ret = -EINVAL;
1595         }
1596
1597         if (ret)
1598                 goto out;
1599
1600         memcpy(esm, scud->cudb[0].esm, sizeof(*esm));
1601         *esm_valid = scud->cudb[0].esm_valid;
1602 out:
1603         spin_unlock_irq(&chsc_page_lock);
1604         return ret;
1605 }
1606 EXPORT_SYMBOL_GPL(chsc_scud);