drivers/s390/cio/chsc.c

   1 /*
   2  *  drivers/s390/cio/chsc.c
   3  *   S/390 common I/O routines -- channel subsystem call
   4  *
   5  *    Copyright IBM Corp. 1999,2010
   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
  19 #include <asm/cio.h>
  20 #include <asm/chpid.h>
  21 #include <asm/chsc.h>
  22 #include <asm/crw.h>
  23
  24 #include "css.h"
  25 #include "cio.h"
  26 #include "cio_debug.h"
  27 #include "ioasm.h"
  28 #include "chp.h"
  29 #include "chsc.h"
  30
  31 static void *sei_page;
  32 static void *chsc_page;
  33 static DEFINE_SPINLOCK(chsc_page_lock);
  34
  35 /**
  36  * chsc_error_from_response() - convert a chsc response to an error
  37  * @response: chsc response code
  38  *
  39  * Returns an appropriate Linux error code for @response.
  40  */
  41 int chsc_error_from_response(int response)
  42 {
  43         switch (response) {
  44         case 0x0001:
  45                 return 0;
  46         case 0x0002:
  47         case 0x0003:
  48         case 0x0006:
  49         case 0x0007:
  50         case 0x0008:
  51         case 0x000a:
  52         case 0x0104:
  53                 return -EINVAL;
  54         case 0x0004:
  55                 return -EOPNOTSUPP;
  56         default:
  57                 return -EIO;
  58         }
  59 }
  60 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  61
  62 struct chsc_ssd_area {
  63         struct chsc_header request;
  64         u16 :10;
  65         u16 ssid:2;
  66         u16 :4;
  67         u16 f_sch;        /* first subchannel */
  68         u16 :16;
  69         u16 l_sch;        /* last subchannel */
  70         u32 :32;
  71         struct chsc_header response;
  72         u32 :32;
  73         u8 sch_valid : 1;
  74         u8 dev_valid : 1;
  75         u8 st        : 3; /* subchannel type */
  76         u8 zeroes    : 3;
  77         u8  unit_addr;    /* unit address */
  78         u16 devno;        /* device number */
  79         u8 path_mask;
  80         u8 fla_valid_mask;
  81         u16 sch;          /* subchannel */
  82         u8 chpid[8];      /* chpids 0-7 */
  83         u16 fla[8];       /* full link addresses 0-7 */
  84 } __attribute__ ((packed));
  85
  86 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  87 {
  88         struct chsc_ssd_area *ssd_area;
  89         int ccode;
  90         int ret;
  91         int i;
  92         int mask;
  93
  94         spin_lock_irq(&chsc_page_lock);
  95         memset(chsc_page, 0, PAGE_SIZE);
  96         ssd_area = chsc_page;
  97         ssd_area->request.length = 0x0010;
  98         ssd_area->request.code = 0x0004;
  99         ssd_area->ssid = schid.ssid;
 100         ssd_area->f_sch = schid.sch_no;
 101         ssd_area->l_sch = schid.sch_no;
 102
 103         ccode = chsc(ssd_area);
 104         /* Check response. */
 105         if (ccode > 0) {
 106                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 107                 goto out;
 108         }
 109         ret = chsc_error_from_response(ssd_area->response.code);
 110         if (ret != 0) {
 111                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 112                               schid.ssid, schid.sch_no,
 113                               ssd_area->response.code);
 114                 goto out;
 115         }
 116         if (!ssd_area->sch_valid) {
 117                 ret = -ENODEV;
 118                 goto out;
 119         }
 120         /* Copy data */
 121         ret = 0;
 122         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 123         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 124             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 125                 goto out;
 126         ssd->path_mask = ssd_area->path_mask;
 127         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 128         for (i = 0; i < 8; i++) {
 129                 mask = 0x80 >> i;
 130                 if (ssd_area->path_mask & mask) {
 131                         chp_id_init(&ssd->chpid[i]);
 132                         ssd->chpid[i].id = ssd_area->chpid[i];
 133                 }
 134                 if (ssd_area->fla_valid_mask & mask)
 135                         ssd->fla[i] = ssd_area->fla[i];
 136         }
 137 out:
 138         spin_unlock_irq(&chsc_page_lock);
 139         return ret;
 140 }
 141
 142 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 143 {
 144         spin_lock_irq(sch->lock);
 145         if (sch->driver && sch->driver->chp_event)
 146                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 147                         goto out_unreg;
 148         spin_unlock_irq(sch->lock);
 149         return 0;
 150
 151 out_unreg:
 152         sch->lpm = 0;
 153         spin_unlock_irq(sch->lock);
 154         css_schedule_eval(sch->schid);
 155         return 0;
 156 }
 157
 158 void chsc_chp_offline(struct chp_id chpid)
 159 {
 160         char dbf_txt[15];
 161         struct chp_link link;
 162
 163         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 164         CIO_TRACE_EVENT(2, dbf_txt);
 165
 166         if (chp_get_status(chpid) <= 0)
 167                 return;
 168         memset(&link, 0, sizeof(struct chp_link));
 169         link.chpid = chpid;
 170         /* Wait until previous actions have settled. */
 171         css_wait_for_slow_path();
 172         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 173 }
 174
 175 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
 176 {
 177         struct schib schib;
 178         /*
 179          * We don't know the device yet, but since a path
 180          * may be available now to the device we'll have
 181          * to do recognition again.
 182          * Since we don't have any idea about which chpid
 183          * that beast may be on we'll have to do a stsch
 184          * on all devices, grr...
 185          */
 186         if (stsch_err(schid, &schib))
 187                 /* We're through */
 188                 return -ENXIO;
 189
 190         /* Put it on the slow path. */
 191         css_schedule_eval(schid);
 192         return 0;
 193 }
 194
 195 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 196 {
 197         spin_lock_irq(sch->lock);
 198         if (sch->driver && sch->driver->chp_event)
 199                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 200         spin_unlock_irq(sch->lock);
 201
 202         return 0;
 203 }
 204
 205 static void s390_process_res_acc(struct chp_link *link)
 206 {
 207         char dbf_txt[15];
 208
 209         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 210                 link->chpid.id);
 211         CIO_TRACE_EVENT( 2, dbf_txt);
 212         if (link->fla != 0) {
 213                 sprintf(dbf_txt, "fla%x", link->fla);
 214                 CIO_TRACE_EVENT( 2, dbf_txt);
 215         }
 216         /* Wait until previous actions have settled. */
 217         css_wait_for_slow_path();
 218         /*
 219          * I/O resources may have become accessible.
 220          * Scan through all subchannels that may be concerned and
 221          * do a validation on those.
 222          * The more information we have (info), the less scanning
 223          * will we have to do.
 224          */
 225         for_each_subchannel_staged(__s390_process_res_acc,
 226                                    s390_process_res_acc_new_sch, link);
 227 }
 228
 229 static int
 230 __get_chpid_from_lir(void *data)
 231 {
 232         struct lir {
 233                 u8  iq;
 234                 u8  ic;
 235                 u16 sci;
 236                 /* incident-node descriptor */
 237                 u32 indesc[28];
 238                 /* attached-node descriptor */
 239                 u32 andesc[28];
 240                 /* incident-specific information */
 241                 u32 isinfo[28];
 242         } __attribute__ ((packed)) *lir;
 243
 244         lir = data;
 245         if (!(lir->iq&0x80))
 246                 /* NULL link incident record */
 247                 return -EINVAL;
 248         if (!(lir->indesc[0]&0xc0000000))
 249                 /* node descriptor not valid */
 250                 return -EINVAL;
 251         if (!(lir->indesc[0]&0x10000000))
 252                 /* don't handle device-type nodes - FIXME */
 253                 return -EINVAL;
 254         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
 255
 256         return (u16) (lir->indesc[0]&0x000000ff);
 257 }
 258
 259 struct chsc_sei_area {
 260         struct chsc_header request;
 261         u32 reserved1;
 262         u32 reserved2;
 263         u32 reserved3;
 264         struct chsc_header response;
 265         u32 reserved4;
 266         u8  flags;
 267         u8  vf;         /* validity flags */
 268         u8  rs;         /* reporting source */
 269         u8  cc;         /* content code */
 270         u16 fla;        /* full link address */
 271         u16 rsid;       /* reporting source id */
 272         u32 reserved5;
 273         u32 reserved6;
 274         u8 ccdf[4096 - 16 - 24];        /* content-code dependent field */
 275         /* ccdf has to be big enough for a link-incident record */
 276 } __attribute__ ((packed));
 277
 278 static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
 279 {
 280         struct chp_id chpid;
 281         int id;
 282
 283         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
 284                       sei_area->rs, sei_area->rsid);
 285         if (sei_area->rs != 4)
 286                 return;
 287         id = __get_chpid_from_lir(sei_area->ccdf);
 288         if (id < 0)
 289                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
 290         else {
 291                 chp_id_init(&chpid);
 292                 chpid.id = id;
 293                 chsc_chp_offline(chpid);
 294         }
 295 }
 296
 297 static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
 298 {
 299         struct chp_link link;
 300         struct chp_id chpid;
 301         int status;
 302
 303         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 304                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 305         if (sei_area->rs != 4)
 306                 return;
 307         chp_id_init(&chpid);
 308         chpid.id = sei_area->rsid;
 309         /* allocate a new channel path structure, if needed */
 310         status = chp_get_status(chpid);
 311         if (status < 0)
 312                 chp_new(chpid);
 313         else if (!status)
 314                 return;
 315         memset(&link, 0, sizeof(struct chp_link));
 316         link.chpid = chpid;
 317         if ((sei_area->vf & 0xc0) != 0) {
 318                 link.fla = sei_area->fla;
 319                 if ((sei_area->vf & 0xc0) == 0xc0)
 320                         /* full link address */
 321                         link.fla_mask = 0xffff;
 322                 else
 323                         /* link address */
 324                         link.fla_mask = 0xff00;
 325         }
 326         s390_process_res_acc(&link);
 327 }
 328
 329 static void chsc_process_sei_chp_avail(struct chsc_sei_area *sei_area)
 330 {
 331         struct channel_path *chp;
 332         struct chp_id chpid;
 333         u8 *data;
 334         int num;
 335
 336         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 337         if (sei_area->rs != 0)
 338                 return;
 339         data = sei_area->ccdf;
 340         chp_id_init(&chpid);
 341         for (num = 0; num <= __MAX_CHPID; num++) {
 342                 if (!chp_test_bit(data, num))
 343                         continue;
 344                 chpid.id = num;
 345
 346                 CIO_CRW_EVENT(4, "Update information for channel path "
 347                               "%x.%02x\n", chpid.cssid, chpid.id);
 348                 chp = chpid_to_chp(chpid);
 349                 if (!chp) {
 350                         chp_new(chpid);
 351                         continue;
 352                 }
 353                 mutex_lock(&chp->lock);
 354                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 355                 mutex_unlock(&chp->lock);
 356         }
 357 }
 358
 359 struct chp_config_data {
 360         u8 map[32];
 361         u8 op;
 362         u8 pc;
 363 };
 364
 365 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
 366 {
 367         struct chp_config_data *data;
 368         struct chp_id chpid;
 369         int num;
 370         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 371
 372         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 373         if (sei_area->rs != 0)
 374                 return;
 375         data = (struct chp_config_data *) &(sei_area->ccdf);
 376         chp_id_init(&chpid);
 377         for (num = 0; num <= __MAX_CHPID; num++) {
 378                 if (!chp_test_bit(data->map, num))
 379                         continue;
 380                 chpid.id = num;
 381                 pr_notice("Processing %s for channel path %x.%02x\n",
 382                           events[data->op], chpid.cssid, chpid.id);
 383                 switch (data->op) {
 384                 case 0:
 385                         chp_cfg_schedule(chpid, 1);
 386                         break;
 387                 case 1:
 388                         chp_cfg_schedule(chpid, 0);
 389                         break;
 390                 case 2:
 391                         chp_cfg_cancel_deconfigure(chpid);
 392                         break;
 393                 }
 394         }
 395 }
 396
 397 static void chsc_process_sei(struct chsc_sei_area *sei_area)
 398 {
 399         /* Check if we might have lost some information. */
 400         if (sei_area->flags & 0x40) {
 401                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 402                 css_schedule_eval_all();
 403         }
 404         /* which kind of information was stored? */
 405         switch (sei_area->cc) {
 406         case 1: /* link incident*/
 407                 chsc_process_sei_link_incident(sei_area);
 408                 break;
 409         case 2: /* i/o resource accessibility */
 410                 chsc_process_sei_res_acc(sei_area);
 411                 break;
 412         case 7: /* channel-path-availability information */
 413                 chsc_process_sei_chp_avail(sei_area);
 414                 break;
 415         case 8: /* channel-path-configuration notification */
 416                 chsc_process_sei_chp_config(sei_area);
 417                 break;
 418         default: /* other stuff */
 419                 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
 420                               sei_area->cc);
 421                 break;
 422         }
 423 }
 424
 425 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 426 {
 427         struct chsc_sei_area *sei_area;
 428
 429         if (overflow) {
 430                 css_schedule_eval_all();
 431                 return;
 432         }
 433         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 434                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 435                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 436                       crw0->erc, crw0->rsid);
 437         if (!sei_page)
 438                 return;
 439         /* Access to sei_page is serialized through machine check handler
 440          * thread, so no need for locking. */
 441         sei_area = sei_page;
 442
 443         CIO_TRACE_EVENT(2, "prcss");
 444         do {
 445                 memset(sei_area, 0, sizeof(*sei_area));
 446                 sei_area->request.length = 0x0010;
 447                 sei_area->request.code = 0x000e;
 448                 if (chsc(sei_area))
 449                         break;
 450
 451                 if (sei_area->response.code == 0x0001) {
 452                         CIO_CRW_EVENT(4, "chsc: sei successful\n");
 453                         chsc_process_sei(sei_area);
 454                 } else {
 455                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 456                                       sei_area->response.code);
 457                         break;
 458                 }
 459         } while (sei_area->flags & 0x80);
 460 }
 461
 462 void chsc_chp_online(struct chp_id chpid)
 463 {
 464         char dbf_txt[15];
 465         struct chp_link link;
 466
 467         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 468         CIO_TRACE_EVENT(2, dbf_txt);
 469
 470         if (chp_get_status(chpid) != 0) {
 471                 memset(&link, 0, sizeof(struct chp_link));
 472                 link.chpid = chpid;
 473                 /* Wait until previous actions have settled. */
 474                 css_wait_for_slow_path();
 475                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 476                                            &link);
 477         }
 478 }
 479
 480 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 481                                          struct chp_id chpid, int on)
 482 {
 483         unsigned long flags;
 484         struct chp_link link;
 485
 486         memset(&link, 0, sizeof(struct chp_link));
 487         link.chpid = chpid;
 488         spin_lock_irqsave(sch->lock, flags);
 489         if (sch->driver && sch->driver->chp_event)
 490                 sch->driver->chp_event(sch, &link,
 491                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 492         spin_unlock_irqrestore(sch->lock, flags);
 493 }
 494
 495 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 496 {
 497         struct chp_id *chpid = data;
 498
 499         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 500         return 0;
 501 }
 502
 503 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 504 {
 505         struct chp_id *chpid = data;
 506
 507         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 508         return 0;
 509 }
 510
 511 static int
 512 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 513 {
 514         struct schib schib;
 515
 516         if (stsch_err(schid, &schib))
 517                 /* We're through */
 518                 return -ENXIO;
 519         /* Put it on the slow path. */
 520         css_schedule_eval(schid);
 521         return 0;
 522 }
 523
 524 /**
 525  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 526  * @chpid: channl-path ID
 527  * @on: non-zero for vary online, zero for vary offline
 528  */
 529 int chsc_chp_vary(struct chp_id chpid, int on)
 530 {
 531         struct channel_path *chp = chpid_to_chp(chpid);
 532
 533         /* Wait until previous actions have settled. */
 534         css_wait_for_slow_path();
 535         /*
 536          * Redo PathVerification on the devices the chpid connects to
 537          */
 538         if (on) {
 539                 /* Try to update the channel path descritor. */
 540                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 541                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 542                                            __s390_vary_chpid_on, &chpid);
 543         } else
 544                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 545                                            NULL, &chpid);
 546
 547         return 0;
 548 }
 549
 550 static void
 551 chsc_remove_cmg_attr(struct channel_subsystem *css)
 552 {
 553         int i;
 554
 555         for (i = 0; i <= __MAX_CHPID; i++) {
 556                 if (!css->chps[i])
 557                         continue;
 558                 chp_remove_cmg_attr(css->chps[i]);
 559         }
 560 }
 561
 562 static int
 563 chsc_add_cmg_attr(struct channel_subsystem *css)
 564 {
 565         int i, ret;
 566
 567         ret = 0;
 568         for (i = 0; i <= __MAX_CHPID; i++) {
 569                 if (!css->chps[i])
 570                         continue;
 571                 ret = chp_add_cmg_attr(css->chps[i]);
 572                 if (ret)
 573                         goto cleanup;
 574         }
 575         return ret;
 576 cleanup:
 577         for (--i; i >= 0; i--) {
 578                 if (!css->chps[i])
 579                         continue;
 580                 chp_remove_cmg_attr(css->chps[i]);
 581         }
 582         return ret;
 583 }
 584
 585 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 586 {
 587         struct {
 588                 struct chsc_header request;
 589                 u32 operation_code : 2;
 590                 u32 : 30;
 591                 u32 key : 4;
 592                 u32 : 28;
 593                 u32 zeroes1;
 594                 u32 cub_addr1;
 595                 u32 zeroes2;
 596                 u32 cub_addr2;
 597                 u32 reserved[13];
 598                 struct chsc_header response;
 599                 u32 status : 8;
 600                 u32 : 4;
 601                 u32 fmt : 4;
 602                 u32 : 16;
 603         } __attribute__ ((packed)) *secm_area;
 604         int ret, ccode;
 605
 606         spin_lock_irq(&chsc_page_lock);
 607         memset(chsc_page, 0, PAGE_SIZE);
 608         secm_area = chsc_page;
 609         secm_area->request.length = 0x0050;
 610         secm_area->request.code = 0x0016;
 611
 612         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 613         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 614         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 615
 616         secm_area->operation_code = enable ? 0 : 1;
 617
 618         ccode = chsc(secm_area);
 619         if (ccode > 0) {
 620                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 621                 goto out;
 622         }
 623
 624         switch (secm_area->response.code) {
 625         case 0x0102:
 626         case 0x0103:
 627                 ret = -EINVAL;
 628                 break;
 629         default:
 630                 ret = chsc_error_from_response(secm_area->response.code);
 631         }
 632         if (ret != 0)
 633                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 634                               secm_area->response.code);
 635 out:
 636         spin_unlock_irq(&chsc_page_lock);
 637         return ret;
 638 }
 639
 640 int
 641 chsc_secm(struct channel_subsystem *css, int enable)
 642 {
 643         int ret;
 644
 645         if (enable && !css->cm_enabled) {
 646                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 647                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 648                 if (!css->cub_addr1 || !css->cub_addr2) {
 649                         free_page((unsigned long)css->cub_addr1);
 650                         free_page((unsigned long)css->cub_addr2);
 651                         return -ENOMEM;
 652                 }
 653         }
 654         ret = __chsc_do_secm(css, enable);
 655         if (!ret) {
 656                 css->cm_enabled = enable;
 657                 if (css->cm_enabled) {
 658                         ret = chsc_add_cmg_attr(css);
 659                         if (ret) {
 660                                 __chsc_do_secm(css, 0);
 661                                 css->cm_enabled = 0;
 662                         }
 663                 } else
 664                         chsc_remove_cmg_attr(css);
 665         }
 666         if (!css->cm_enabled) {
 667                 free_page((unsigned long)css->cub_addr1);
 668                 free_page((unsigned long)css->cub_addr2);
 669         }
 670         return ret;
 671 }
 672
 673 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 674                                      int c, int m, void *page)
 675 {
 676         struct chsc_scpd *scpd_area;
 677         int ccode, ret;
 678
 679         if ((rfmt == 1) && !css_general_characteristics.fcs)
 680                 return -EINVAL;
 681         if ((rfmt == 2) && !css_general_characteristics.cib)
 682                 return -EINVAL;
 683
 684         memset(page, 0, PAGE_SIZE);
 685         scpd_area = page;
 686         scpd_area->request.length = 0x0010;
 687         scpd_area->request.code = 0x0002;
 688         scpd_area->cssid = chpid.cssid;
 689         scpd_area->first_chpid = chpid.id;
 690         scpd_area->last_chpid = chpid.id;
 691         scpd_area->m = m;
 692         scpd_area->c = c;
 693         scpd_area->fmt = fmt;
 694         scpd_area->rfmt = rfmt;
 695
 696         ccode = chsc(scpd_area);
 697         if (ccode > 0)
 698                 return (ccode == 3) ? -ENODEV : -EBUSY;
 699
 700         ret = chsc_error_from_response(scpd_area->response.code);
 701         if (ret)
 702                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 703                               scpd_area->response.code);
 704         return ret;
 705 }
 706 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 707
 708 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 709                                           struct channel_path_desc *desc)
 710 {
 711         struct chsc_response_struct *chsc_resp;
 712         struct chsc_scpd *scpd_area;
 713         unsigned long flags;
 714         int ret;
 715
 716         spin_lock_irqsave(&chsc_page_lock, flags);
 717         scpd_area = chsc_page;
 718         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 719         if (ret)
 720                 goto out;
 721         chsc_resp = (void *)&scpd_area->response;
 722         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 723 out:
 724         spin_unlock_irqrestore(&chsc_page_lock, flags);
 725         return ret;
 726 }
 727
 728 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 729                                           struct channel_path_desc_fmt1 *desc)
 730 {
 731         struct chsc_response_struct *chsc_resp;
 732         struct chsc_scpd *scpd_area;
 733         int ret;
 734
 735         spin_lock_irq(&chsc_page_lock);
 736         scpd_area = chsc_page;
 737         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
 738         if (ret)
 739                 goto out;
 740         chsc_resp = (void *)&scpd_area->response;
 741         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 742 out:
 743         spin_unlock_irq(&chsc_page_lock);
 744         return ret;
 745 }
 746
 747 static void
 748 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 749                           struct cmg_chars *chars)
 750 {
 751         struct cmg_chars *cmg_chars;
 752         int i, mask;
 753
 754         cmg_chars = chp->cmg_chars;
 755         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 756                 mask = 0x80 >> (i + 3);
 757                 if (cmcv & mask)
 758                         cmg_chars->values[i] = chars->values[i];
 759                 else
 760                         cmg_chars->values[i] = 0;
 761         }
 762 }
 763
 764 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 765 {
 766         struct cmg_chars *cmg_chars;
 767         int ccode, ret;
 768
 769         struct {
 770                 struct chsc_header request;
 771                 u32 : 24;
 772                 u32 first_chpid : 8;
 773                 u32 : 24;
 774                 u32 last_chpid : 8;
 775                 u32 zeroes1;
 776                 struct chsc_header response;
 777                 u32 zeroes2;
 778                 u32 not_valid : 1;
 779                 u32 shared : 1;
 780                 u32 : 22;
 781                 u32 chpid : 8;
 782                 u32 cmcv : 5;
 783                 u32 : 11;
 784                 u32 cmgq : 8;
 785                 u32 cmg : 8;
 786                 u32 zeroes3;
 787                 u32 data[NR_MEASUREMENT_CHARS];
 788         } __attribute__ ((packed)) *scmc_area;
 789
 790         chp->cmg_chars = NULL;
 791         cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
 792         if (!cmg_chars)
 793                 return -ENOMEM;
 794
 795         spin_lock_irq(&chsc_page_lock);
 796         memset(chsc_page, 0, PAGE_SIZE);
 797         scmc_area = chsc_page;
 798         scmc_area->request.length = 0x0010;
 799         scmc_area->request.code = 0x0022;
 800         scmc_area->first_chpid = chp->chpid.id;
 801         scmc_area->last_chpid = chp->chpid.id;
 802
 803         ccode = chsc(scmc_area);
 804         if (ccode > 0) {
 805                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 806                 goto out;
 807         }
 808
 809         ret = chsc_error_from_response(scmc_area->response.code);
 810         if (ret) {
 811                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 812                               scmc_area->response.code);
 813                 goto out;
 814         }
 815         if (scmc_area->not_valid) {
 816                 chp->cmg = -1;
 817                 chp->shared = -1;
 818                 goto out;
 819         }
 820         chp->cmg = scmc_area->cmg;
 821         chp->shared = scmc_area->shared;
 822         if (chp->cmg != 2 && chp->cmg != 3) {
 823                 /* No cmg-dependent data. */
 824                 goto out;
 825         }
 826         chp->cmg_chars = cmg_chars;
 827         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 828                                   (struct cmg_chars *) &scmc_area->data);
 829 out:
 830         spin_unlock_irq(&chsc_page_lock);
 831         if (!chp->cmg_chars)
 832                 kfree(cmg_chars);
 833
 834         return ret;
 835 }
 836
 837 int __init chsc_init(void)
 838 {
 839         int ret;
 840
 841         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 842         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 843         if (!sei_page || !chsc_page) {
 844                 ret = -ENOMEM;
 845                 goto out_err;
 846         }
 847         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
 848         if (ret)
 849                 goto out_err;
 850         return ret;
 851 out_err:
 852         free_page((unsigned long)chsc_page);
 853         free_page((unsigned long)sei_page);
 854         return ret;
 855 }
 856
 857 void __init chsc_init_cleanup(void)
 858 {
 859         crw_unregister_handler(CRW_RSC_CSS);
 860         free_page((unsigned long)chsc_page);
 861         free_page((unsigned long)sei_page);
 862 }
 863
 864 int chsc_enable_facility(int operation_code)
 865 {
 866         unsigned long flags;
 867         int ret;
 868         struct {
 869                 struct chsc_header request;
 870                 u8 reserved1:4;
 871                 u8 format:4;
 872                 u8 reserved2;
 873                 u16 operation_code;
 874                 u32 reserved3;
 875                 u32 reserved4;
 876                 u32 operation_data_area[252];
 877                 struct chsc_header response;
 878                 u32 reserved5:4;
 879                 u32 format2:4;
 880                 u32 reserved6:24;
 881         } __attribute__ ((packed)) *sda_area;
 882
 883         spin_lock_irqsave(&chsc_page_lock, flags);
 884         memset(chsc_page, 0, PAGE_SIZE);
 885         sda_area = chsc_page;
 886         sda_area->request.length = 0x0400;
 887         sda_area->request.code = 0x0031;
 888         sda_area->operation_code = operation_code;
 889
 890         ret = chsc(sda_area);
 891         if (ret > 0) {
 892                 ret = (ret == 3) ? -ENODEV : -EBUSY;
 893                 goto out;
 894         }
 895
 896         switch (sda_area->response.code) {
 897         case 0x0101:
 898                 ret = -EOPNOTSUPP;
 899                 break;
 900         default:
 901                 ret = chsc_error_from_response(sda_area->response.code);
 902         }
 903         if (ret != 0)
 904                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
 905                               operation_code, sda_area->response.code);
 906 out:
 907         spin_unlock_irqrestore(&chsc_page_lock, flags);
 908         return ret;
 909 }
 910
 911 struct css_general_char css_general_characteristics;
 912 struct css_chsc_char css_chsc_characteristics;
 913
 914 int __init
 915 chsc_determine_css_characteristics(void)
 916 {
 917         int result;
 918         struct {
 919                 struct chsc_header request;
 920                 u32 reserved1;
 921                 u32 reserved2;
 922                 u32 reserved3;
 923                 struct chsc_header response;
 924                 u32 reserved4;
 925                 u32 general_char[510];
 926                 u32 chsc_char[508];
 927         } __attribute__ ((packed)) *scsc_area;
 928
 929         spin_lock_irq(&chsc_page_lock);
 930         memset(chsc_page, 0, PAGE_SIZE);
 931         scsc_area = chsc_page;
 932         scsc_area->request.length = 0x0010;
 933         scsc_area->request.code = 0x0010;
 934
 935         result = chsc(scsc_area);
 936         if (result) {
 937                 result = (result == 3) ? -ENODEV : -EBUSY;
 938                 goto exit;
 939         }
 940
 941         result = chsc_error_from_response(scsc_area->response.code);
 942         if (result == 0) {
 943                 memcpy(&css_general_characteristics, scsc_area->general_char,
 944                        sizeof(css_general_characteristics));
 945                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
 946                        sizeof(css_chsc_characteristics));
 947         } else
 948                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
 949                               scsc_area->response.code);
 950 exit:
 951         spin_unlock_irq(&chsc_page_lock);
 952         return result;
 953 }
 954
 955 EXPORT_SYMBOL_GPL(css_general_characteristics);
 956 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
 957
 958 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
 959 {
 960         struct {
 961                 struct chsc_header request;
 962                 unsigned int rsvd0;
 963                 unsigned int op : 8;
 964                 unsigned int rsvd1 : 8;
 965                 unsigned int ctrl : 16;
 966                 unsigned int rsvd2[5];
 967                 struct chsc_header response;
 968                 unsigned int rsvd3[7];
 969         } __attribute__ ((packed)) *rr;
 970         int rc;
 971
 972         memset(page, 0, PAGE_SIZE);
 973         rr = page;
 974         rr->request.length = 0x0020;
 975         rr->request.code = 0x0033;
 976         rr->op = op;
 977         rr->ctrl = ctrl;
 978         rc = chsc(rr);
 979         if (rc)
 980                 return -EIO;
 981         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
 982         return rc;
 983 }
 984
 985 int chsc_sstpi(void *page, void *result, size_t size)
 986 {
 987         struct {
 988                 struct chsc_header request;
 989                 unsigned int rsvd0[3];
 990                 struct chsc_header response;
 991                 char data[size];
 992         } __attribute__ ((packed)) *rr;
 993         int rc;
 994
 995         memset(page, 0, PAGE_SIZE);
 996         rr = page;
 997         rr->request.length = 0x0010;
 998         rr->request.code = 0x0038;
 999         rc = chsc(rr);
1000         if (rc)
1001                 return -EIO;
1002         memcpy(result, &rr->data, size);
1003         return (rr->response.code == 0x0001) ? 0 : -EIO;
1004 }
1005
1006 int chsc_siosl(struct subchannel_id schid)
1007 {
1008         struct {
1009                 struct chsc_header request;
1010                 u32 word1;
1011                 struct subchannel_id sid;
1012                 u32 word3;
1013                 struct chsc_header response;
1014                 u32 word[11];
1015         } __attribute__ ((packed)) *siosl_area;
1016         unsigned long flags;
1017         int ccode;
1018         int rc;
1019
1020         spin_lock_irqsave(&chsc_page_lock, flags);
1021         memset(chsc_page, 0, PAGE_SIZE);
1022         siosl_area = chsc_page;
1023         siosl_area->request.length = 0x0010;
1024         siosl_area->request.code = 0x0046;
1025         siosl_area->word1 = 0x80000000;
1026         siosl_area->sid = schid;
1027
1028         ccode = chsc(siosl_area);
1029         if (ccode > 0) {
1030                 if (ccode == 3)
1031                         rc = -ENODEV;
1032                 else
1033                         rc = -EBUSY;
1034                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1035                               schid.ssid, schid.sch_no, ccode);
1036                 goto out;
1037         }
1038         rc = chsc_error_from_response(siosl_area->response.code);
1039         if (rc)
1040                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1041                               schid.ssid, schid.sch_no,
1042                               siosl_area->response.code);
1043         else
1044                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1045                               schid.ssid, schid.sch_no);
1046 out:
1047         spin_unlock_irqrestore(&chsc_page_lock, flags);
1048         return rc;
1049 }
1050 EXPORT_SYMBOL_GPL(chsc_siosl);