drivers/s390/cio/chsc.c

   1 /*
   2  *   S/390 common I/O routines -- channel subsystem call
   3  *
   4  *    Copyright IBM Corp. 1999, 2010
   5  *    Author(s): Ingo Adlung (adlung@de.ibm.com)
   6  *               Cornelia Huck (cornelia.huck@de.ibm.com)
   7  *               Arnd Bergmann (arndb@de.ibm.com)
   8  */
   9
  10 #define KMSG_COMPONENT "cio"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/init.h>
  16 #include <linux/device.h>
  17
  18 #include <asm/cio.h>
  19 #include <asm/chpid.h>
  20 #include <asm/chsc.h>
  21 #include <asm/crw.h>
  22
  23 #include "css.h"
  24 #include "cio.h"
  25 #include "cio_debug.h"
  26 #include "ioasm.h"
  27 #include "chp.h"
  28 #include "chsc.h"
  29
  30 static void *sei_page;
  31 static void *chsc_page;
  32 static DEFINE_SPINLOCK(chsc_page_lock);
  33
  34 /**
  35  * chsc_error_from_response() - convert a chsc response to an error
  36  * @response: chsc response code
  37  *
  38  * Returns an appropriate Linux error code for @response.
  39  */
  40 int chsc_error_from_response(int response)
  41 {
  42         switch (response) {
  43         case 0x0001:
  44                 return 0;
  45         case 0x0002:
  46         case 0x0003:
  47         case 0x0006:
  48         case 0x0007:
  49         case 0x0008:
  50         case 0x000a:
  51         case 0x0104:
  52                 return -EINVAL;
  53         case 0x0004:
  54                 return -EOPNOTSUPP;
  55         default:
  56                 return -EIO;
  57         }
  58 }
  59 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  60
  61 struct chsc_ssd_area {
  62         struct chsc_header request;
  63         u16 :10;
  64         u16 ssid:2;
  65         u16 :4;
  66         u16 f_sch;        /* first subchannel */
  67         u16 :16;
  68         u16 l_sch;        /* last subchannel */
  69         u32 :32;
  70         struct chsc_header response;
  71         u32 :32;
  72         u8 sch_valid : 1;
  73         u8 dev_valid : 1;
  74         u8 st        : 3; /* subchannel type */
  75         u8 zeroes    : 3;
  76         u8  unit_addr;    /* unit address */
  77         u16 devno;        /* device number */
  78         u8 path_mask;
  79         u8 fla_valid_mask;
  80         u16 sch;          /* subchannel */
  81         u8 chpid[8];      /* chpids 0-7 */
  82         u16 fla[8];       /* full link addresses 0-7 */
  83 } __attribute__ ((packed));
  84
  85 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  86 {
  87         struct chsc_ssd_area *ssd_area;
  88         int ccode;
  89         int ret;
  90         int i;
  91         int mask;
  92
  93         spin_lock_irq(&chsc_page_lock);
  94         memset(chsc_page, 0, PAGE_SIZE);
  95         ssd_area = chsc_page;
  96         ssd_area->request.length = 0x0010;
  97         ssd_area->request.code = 0x0004;
  98         ssd_area->ssid = schid.ssid;
  99         ssd_area->f_sch = schid.sch_no;
 100         ssd_area->l_sch = schid.sch_no;
 101
 102         ccode = chsc(ssd_area);
 103         /* Check response. */
 104         if (ccode > 0) {
 105                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 106                 goto out;
 107         }
 108         ret = chsc_error_from_response(ssd_area->response.code);
 109         if (ret != 0) {
 110                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 111                               schid.ssid, schid.sch_no,
 112                               ssd_area->response.code);
 113                 goto out;
 114         }
 115         if (!ssd_area->sch_valid) {
 116                 ret = -ENODEV;
 117                 goto out;
 118         }
 119         /* Copy data */
 120         ret = 0;
 121         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 122         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 123             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 124                 goto out;
 125         ssd->path_mask = ssd_area->path_mask;
 126         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 127         for (i = 0; i < 8; i++) {
 128                 mask = 0x80 >> i;
 129                 if (ssd_area->path_mask & mask) {
 130                         chp_id_init(&ssd->chpid[i]);
 131                         ssd->chpid[i].id = ssd_area->chpid[i];
 132                 }
 133                 if (ssd_area->fla_valid_mask & mask)
 134                         ssd->fla[i] = ssd_area->fla[i];
 135         }
 136 out:
 137         spin_unlock_irq(&chsc_page_lock);
 138         return ret;
 139 }
 140
 141 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 142 {
 143         spin_lock_irq(sch->lock);
 144         if (sch->driver && sch->driver->chp_event)
 145                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 146                         goto out_unreg;
 147         spin_unlock_irq(sch->lock);
 148         return 0;
 149
 150 out_unreg:
 151         sch->lpm = 0;
 152         spin_unlock_irq(sch->lock);
 153         css_schedule_eval(sch->schid);
 154         return 0;
 155 }
 156
 157 void chsc_chp_offline(struct chp_id chpid)
 158 {
 159         char dbf_txt[15];
 160         struct chp_link link;
 161
 162         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 163         CIO_TRACE_EVENT(2, dbf_txt);
 164
 165         if (chp_get_status(chpid) <= 0)
 166                 return;
 167         memset(&link, 0, sizeof(struct chp_link));
 168         link.chpid = chpid;
 169         /* Wait until previous actions have settled. */
 170         css_wait_for_slow_path();
 171         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 172 }
 173
 174 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
 175 {
 176         struct schib schib;
 177         /*
 178          * We don't know the device yet, but since a path
 179          * may be available now to the device we'll have
 180          * to do recognition again.
 181          * Since we don't have any idea about which chpid
 182          * that beast may be on we'll have to do a stsch
 183          * on all devices, grr...
 184          */
 185         if (stsch_err(schid, &schib))
 186                 /* We're through */
 187                 return -ENXIO;
 188
 189         /* Put it on the slow path. */
 190         css_schedule_eval(schid);
 191         return 0;
 192 }
 193
 194 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 195 {
 196         spin_lock_irq(sch->lock);
 197         if (sch->driver && sch->driver->chp_event)
 198                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 199         spin_unlock_irq(sch->lock);
 200
 201         return 0;
 202 }
 203
 204 static void s390_process_res_acc(struct chp_link *link)
 205 {
 206         char dbf_txt[15];
 207
 208         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 209                 link->chpid.id);
 210         CIO_TRACE_EVENT( 2, dbf_txt);
 211         if (link->fla != 0) {
 212                 sprintf(dbf_txt, "fla%x", link->fla);
 213                 CIO_TRACE_EVENT( 2, dbf_txt);
 214         }
 215         /* Wait until previous actions have settled. */
 216         css_wait_for_slow_path();
 217         /*
 218          * I/O resources may have become accessible.
 219          * Scan through all subchannels that may be concerned and
 220          * do a validation on those.
 221          * The more information we have (info), the less scanning
 222          * will we have to do.
 223          */
 224         for_each_subchannel_staged(__s390_process_res_acc,
 225                                    s390_process_res_acc_new_sch, link);
 226 }
 227
 228 static int
 229 __get_chpid_from_lir(void *data)
 230 {
 231         struct lir {
 232                 u8  iq;
 233                 u8  ic;
 234                 u16 sci;
 235                 /* incident-node descriptor */
 236                 u32 indesc[28];
 237                 /* attached-node descriptor */
 238                 u32 andesc[28];
 239                 /* incident-specific information */
 240                 u32 isinfo[28];
 241         } __attribute__ ((packed)) *lir;
 242
 243         lir = data;
 244         if (!(lir->iq&0x80))
 245                 /* NULL link incident record */
 246                 return -EINVAL;
 247         if (!(lir->indesc[0]&0xc0000000))
 248                 /* node descriptor not valid */
 249                 return -EINVAL;
 250         if (!(lir->indesc[0]&0x10000000))
 251                 /* don't handle device-type nodes - FIXME */
 252                 return -EINVAL;
 253         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
 254
 255         return (u16) (lir->indesc[0]&0x000000ff);
 256 }
 257
 258 struct chsc_sei_area {
 259         struct chsc_header request;
 260         u32 reserved1;
 261         u32 reserved2;
 262         u32 reserved3;
 263         struct chsc_header response;
 264         u32 reserved4;
 265         u8  flags;
 266         u8  vf;         /* validity flags */
 267         u8  rs;         /* reporting source */
 268         u8  cc;         /* content code */
 269         u16 fla;        /* full link address */
 270         u16 rsid;       /* reporting source id */
 271         u32 reserved5;
 272         u32 reserved6;
 273         u8 ccdf[4096 - 16 - 24];        /* content-code dependent field */
 274         /* ccdf has to be big enough for a link-incident record */
 275 } __attribute__ ((packed));
 276
 277 static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
 278 {
 279         struct chp_id chpid;
 280         int id;
 281
 282         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
 283                       sei_area->rs, sei_area->rsid);
 284         if (sei_area->rs != 4)
 285                 return;
 286         id = __get_chpid_from_lir(sei_area->ccdf);
 287         if (id < 0)
 288                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
 289         else {
 290                 chp_id_init(&chpid);
 291                 chpid.id = id;
 292                 chsc_chp_offline(chpid);
 293         }
 294 }
 295
 296 static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
 297 {
 298         struct chp_link link;
 299         struct chp_id chpid;
 300         int status;
 301
 302         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 303                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 304         if (sei_area->rs != 4)
 305                 return;
 306         chp_id_init(&chpid);
 307         chpid.id = sei_area->rsid;
 308         /* allocate a new channel path structure, if needed */
 309         status = chp_get_status(chpid);
 310         if (status < 0)
 311                 chp_new(chpid);
 312         else if (!status)
 313                 return;
 314         memset(&link, 0, sizeof(struct chp_link));
 315         link.chpid = chpid;
 316         if ((sei_area->vf & 0xc0) != 0) {
 317                 link.fla = sei_area->fla;
 318                 if ((sei_area->vf & 0xc0) == 0xc0)
 319                         /* full link address */
 320                         link.fla_mask = 0xffff;
 321                 else
 322                         /* link address */
 323                         link.fla_mask = 0xff00;
 324         }
 325         s390_process_res_acc(&link);
 326 }
 327
 328 static void chsc_process_sei_chp_avail(struct chsc_sei_area *sei_area)
 329 {
 330         struct channel_path *chp;
 331         struct chp_id chpid;
 332         u8 *data;
 333         int num;
 334
 335         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 336         if (sei_area->rs != 0)
 337                 return;
 338         data = sei_area->ccdf;
 339         chp_id_init(&chpid);
 340         for (num = 0; num <= __MAX_CHPID; num++) {
 341                 if (!chp_test_bit(data, num))
 342                         continue;
 343                 chpid.id = num;
 344
 345                 CIO_CRW_EVENT(4, "Update information for channel path "
 346                               "%x.%02x\n", chpid.cssid, chpid.id);
 347                 chp = chpid_to_chp(chpid);
 348                 if (!chp) {
 349                         chp_new(chpid);
 350                         continue;
 351                 }
 352                 mutex_lock(&chp->lock);
 353                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 354                 mutex_unlock(&chp->lock);
 355         }
 356 }
 357
 358 struct chp_config_data {
 359         u8 map[32];
 360         u8 op;
 361         u8 pc;
 362 };
 363
 364 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
 365 {
 366         struct chp_config_data *data;
 367         struct chp_id chpid;
 368         int num;
 369         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 370
 371         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 372         if (sei_area->rs != 0)
 373                 return;
 374         data = (struct chp_config_data *) &(sei_area->ccdf);
 375         chp_id_init(&chpid);
 376         for (num = 0; num <= __MAX_CHPID; num++) {
 377                 if (!chp_test_bit(data->map, num))
 378                         continue;
 379                 chpid.id = num;
 380                 pr_notice("Processing %s for channel path %x.%02x\n",
 381                           events[data->op], chpid.cssid, chpid.id);
 382                 switch (data->op) {
 383                 case 0:
 384                         chp_cfg_schedule(chpid, 1);
 385                         break;
 386                 case 1:
 387                         chp_cfg_schedule(chpid, 0);
 388                         break;
 389                 case 2:
 390                         chp_cfg_cancel_deconfigure(chpid);
 391                         break;
 392                 }
 393         }
 394 }
 395
 396 static void chsc_process_sei(struct chsc_sei_area *sei_area)
 397 {
 398         /* Check if we might have lost some information. */
 399         if (sei_area->flags & 0x40) {
 400                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 401                 css_schedule_eval_all();
 402         }
 403         /* which kind of information was stored? */
 404         switch (sei_area->cc) {
 405         case 1: /* link incident*/
 406                 chsc_process_sei_link_incident(sei_area);
 407                 break;
 408         case 2: /* i/o resource accessibility */
 409                 chsc_process_sei_res_acc(sei_area);
 410                 break;
 411         case 7: /* channel-path-availability information */
 412                 chsc_process_sei_chp_avail(sei_area);
 413                 break;
 414         case 8: /* channel-path-configuration notification */
 415                 chsc_process_sei_chp_config(sei_area);
 416                 break;
 417         default: /* other stuff */
 418                 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
 419                               sei_area->cc);
 420                 break;
 421         }
 422 }
 423
 424 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 425 {
 426         struct chsc_sei_area *sei_area;
 427
 428         if (overflow) {
 429                 css_schedule_eval_all();
 430                 return;
 431         }
 432         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 433                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 434                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 435                       crw0->erc, crw0->rsid);
 436         if (!sei_page)
 437                 return;
 438         /* Access to sei_page is serialized through machine check handler
 439          * thread, so no need for locking. */
 440         sei_area = sei_page;
 441
 442         CIO_TRACE_EVENT(2, "prcss");
 443         do {
 444                 memset(sei_area, 0, sizeof(*sei_area));
 445                 sei_area->request.length = 0x0010;
 446                 sei_area->request.code = 0x000e;
 447                 if (chsc(sei_area))
 448                         break;
 449
 450                 if (sei_area->response.code == 0x0001) {
 451                         CIO_CRW_EVENT(4, "chsc: sei successful\n");
 452                         chsc_process_sei(sei_area);
 453                 } else {
 454                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 455                                       sei_area->response.code);
 456                         break;
 457                 }
 458         } while (sei_area->flags & 0x80);
 459 }
 460
 461 void chsc_chp_online(struct chp_id chpid)
 462 {
 463         char dbf_txt[15];
 464         struct chp_link link;
 465
 466         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 467         CIO_TRACE_EVENT(2, dbf_txt);
 468
 469         if (chp_get_status(chpid) != 0) {
 470                 memset(&link, 0, sizeof(struct chp_link));
 471                 link.chpid = chpid;
 472                 /* Wait until previous actions have settled. */
 473                 css_wait_for_slow_path();
 474                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 475                                            &link);
 476         }
 477 }
 478
 479 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 480                                          struct chp_id chpid, int on)
 481 {
 482         unsigned long flags;
 483         struct chp_link link;
 484
 485         memset(&link, 0, sizeof(struct chp_link));
 486         link.chpid = chpid;
 487         spin_lock_irqsave(sch->lock, flags);
 488         if (sch->driver && sch->driver->chp_event)
 489                 sch->driver->chp_event(sch, &link,
 490                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 491         spin_unlock_irqrestore(sch->lock, flags);
 492 }
 493
 494 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 495 {
 496         struct chp_id *chpid = data;
 497
 498         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 499         return 0;
 500 }
 501
 502 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 503 {
 504         struct chp_id *chpid = data;
 505
 506         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 507         return 0;
 508 }
 509
 510 static int
 511 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 512 {
 513         struct schib schib;
 514
 515         if (stsch_err(schid, &schib))
 516                 /* We're through */
 517                 return -ENXIO;
 518         /* Put it on the slow path. */
 519         css_schedule_eval(schid);
 520         return 0;
 521 }
 522
 523 /**
 524  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 525  * @chpid: channl-path ID
 526  * @on: non-zero for vary online, zero for vary offline
 527  */
 528 int chsc_chp_vary(struct chp_id chpid, int on)
 529 {
 530         struct channel_path *chp = chpid_to_chp(chpid);
 531
 532         /* Wait until previous actions have settled. */
 533         css_wait_for_slow_path();
 534         /*
 535          * Redo PathVerification on the devices the chpid connects to
 536          */
 537         if (on) {
 538                 /* Try to update the channel path descritor. */
 539                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 540                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 541                                            __s390_vary_chpid_on, &chpid);
 542         } else
 543                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 544                                            NULL, &chpid);
 545
 546         return 0;
 547 }
 548
 549 static void
 550 chsc_remove_cmg_attr(struct channel_subsystem *css)
 551 {
 552         int i;
 553
 554         for (i = 0; i <= __MAX_CHPID; i++) {
 555                 if (!css->chps[i])
 556                         continue;
 557                 chp_remove_cmg_attr(css->chps[i]);
 558         }
 559 }
 560
 561 static int
 562 chsc_add_cmg_attr(struct channel_subsystem *css)
 563 {
 564         int i, ret;
 565
 566         ret = 0;
 567         for (i = 0; i <= __MAX_CHPID; i++) {
 568                 if (!css->chps[i])
 569                         continue;
 570                 ret = chp_add_cmg_attr(css->chps[i]);
 571                 if (ret)
 572                         goto cleanup;
 573         }
 574         return ret;
 575 cleanup:
 576         for (--i; i >= 0; i--) {
 577                 if (!css->chps[i])
 578                         continue;
 579                 chp_remove_cmg_attr(css->chps[i]);
 580         }
 581         return ret;
 582 }
 583
 584 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 585 {
 586         struct {
 587                 struct chsc_header request;
 588                 u32 operation_code : 2;
 589                 u32 : 30;
 590                 u32 key : 4;
 591                 u32 : 28;
 592                 u32 zeroes1;
 593                 u32 cub_addr1;
 594                 u32 zeroes2;
 595                 u32 cub_addr2;
 596                 u32 reserved[13];
 597                 struct chsc_header response;
 598                 u32 status : 8;
 599                 u32 : 4;
 600                 u32 fmt : 4;
 601                 u32 : 16;
 602         } __attribute__ ((packed)) *secm_area;
 603         int ret, ccode;
 604
 605         spin_lock_irq(&chsc_page_lock);
 606         memset(chsc_page, 0, PAGE_SIZE);
 607         secm_area = chsc_page;
 608         secm_area->request.length = 0x0050;
 609         secm_area->request.code = 0x0016;
 610
 611         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 612         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 613         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 614
 615         secm_area->operation_code = enable ? 0 : 1;
 616
 617         ccode = chsc(secm_area);
 618         if (ccode > 0) {
 619                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 620                 goto out;
 621         }
 622
 623         switch (secm_area->response.code) {
 624         case 0x0102:
 625         case 0x0103:
 626                 ret = -EINVAL;
 627                 break;
 628         default:
 629                 ret = chsc_error_from_response(secm_area->response.code);
 630         }
 631         if (ret != 0)
 632                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 633                               secm_area->response.code);
 634 out:
 635         spin_unlock_irq(&chsc_page_lock);
 636         return ret;
 637 }
 638
 639 int
 640 chsc_secm(struct channel_subsystem *css, int enable)
 641 {
 642         int ret;
 643
 644         if (enable && !css->cm_enabled) {
 645                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 646                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 647                 if (!css->cub_addr1 || !css->cub_addr2) {
 648                         free_page((unsigned long)css->cub_addr1);
 649                         free_page((unsigned long)css->cub_addr2);
 650                         return -ENOMEM;
 651                 }
 652         }
 653         ret = __chsc_do_secm(css, enable);
 654         if (!ret) {
 655                 css->cm_enabled = enable;
 656                 if (css->cm_enabled) {
 657                         ret = chsc_add_cmg_attr(css);
 658                         if (ret) {
 659                                 __chsc_do_secm(css, 0);
 660                                 css->cm_enabled = 0;
 661                         }
 662                 } else
 663                         chsc_remove_cmg_attr(css);
 664         }
 665         if (!css->cm_enabled) {
 666                 free_page((unsigned long)css->cub_addr1);
 667                 free_page((unsigned long)css->cub_addr2);
 668         }
 669         return ret;
 670 }
 671
 672 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 673                                      int c, int m, void *page)
 674 {
 675         struct chsc_scpd *scpd_area;
 676         int ccode, ret;
 677
 678         if ((rfmt == 1) && !css_general_characteristics.fcs)
 679                 return -EINVAL;
 680         if ((rfmt == 2) && !css_general_characteristics.cib)
 681                 return -EINVAL;
 682
 683         memset(page, 0, PAGE_SIZE);
 684         scpd_area = page;
 685         scpd_area->request.length = 0x0010;
 686         scpd_area->request.code = 0x0002;
 687         scpd_area->cssid = chpid.cssid;
 688         scpd_area->first_chpid = chpid.id;
 689         scpd_area->last_chpid = chpid.id;
 690         scpd_area->m = m;
 691         scpd_area->c = c;
 692         scpd_area->fmt = fmt;
 693         scpd_area->rfmt = rfmt;
 694
 695         ccode = chsc(scpd_area);
 696         if (ccode > 0)
 697                 return (ccode == 3) ? -ENODEV : -EBUSY;
 698
 699         ret = chsc_error_from_response(scpd_area->response.code);
 700         if (ret)
 701                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 702                               scpd_area->response.code);
 703         return ret;
 704 }
 705 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 706
 707 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 708                                           struct channel_path_desc *desc)
 709 {
 710         struct chsc_response_struct *chsc_resp;
 711         struct chsc_scpd *scpd_area;
 712         unsigned long flags;
 713         int ret;
 714
 715         spin_lock_irqsave(&chsc_page_lock, flags);
 716         scpd_area = chsc_page;
 717         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 718         if (ret)
 719                 goto out;
 720         chsc_resp = (void *)&scpd_area->response;
 721         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 722 out:
 723         spin_unlock_irqrestore(&chsc_page_lock, flags);
 724         return ret;
 725 }
 726
 727 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 728                                           struct channel_path_desc_fmt1 *desc)
 729 {
 730         struct chsc_response_struct *chsc_resp;
 731         struct chsc_scpd *scpd_area;
 732         int ret;
 733
 734         spin_lock_irq(&chsc_page_lock);
 735         scpd_area = chsc_page;
 736         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
 737         if (ret)
 738                 goto out;
 739         chsc_resp = (void *)&scpd_area->response;
 740         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 741 out:
 742         spin_unlock_irq(&chsc_page_lock);
 743         return ret;
 744 }
 745
 746 static void
 747 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 748                           struct cmg_chars *chars)
 749 {
 750         struct cmg_chars *cmg_chars;
 751         int i, mask;
 752
 753         cmg_chars = chp->cmg_chars;
 754         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 755                 mask = 0x80 >> (i + 3);
 756                 if (cmcv & mask)
 757                         cmg_chars->values[i] = chars->values[i];
 758                 else
 759                         cmg_chars->values[i] = 0;
 760         }
 761 }
 762
 763 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 764 {
 765         struct cmg_chars *cmg_chars;
 766         int ccode, ret;
 767
 768         struct {
 769                 struct chsc_header request;
 770                 u32 : 24;
 771                 u32 first_chpid : 8;
 772                 u32 : 24;
 773                 u32 last_chpid : 8;
 774                 u32 zeroes1;
 775                 struct chsc_header response;
 776                 u32 zeroes2;
 777                 u32 not_valid : 1;
 778                 u32 shared : 1;
 779                 u32 : 22;
 780                 u32 chpid : 8;
 781                 u32 cmcv : 5;
 782                 u32 : 11;
 783                 u32 cmgq : 8;
 784                 u32 cmg : 8;
 785                 u32 zeroes3;
 786                 u32 data[NR_MEASUREMENT_CHARS];
 787         } __attribute__ ((packed)) *scmc_area;
 788
 789         chp->cmg_chars = NULL;
 790         cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
 791         if (!cmg_chars)
 792                 return -ENOMEM;
 793
 794         spin_lock_irq(&chsc_page_lock);
 795         memset(chsc_page, 0, PAGE_SIZE);
 796         scmc_area = chsc_page;
 797         scmc_area->request.length = 0x0010;
 798         scmc_area->request.code = 0x0022;
 799         scmc_area->first_chpid = chp->chpid.id;
 800         scmc_area->last_chpid = chp->chpid.id;
 801
 802         ccode = chsc(scmc_area);
 803         if (ccode > 0) {
 804                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 805                 goto out;
 806         }
 807
 808         ret = chsc_error_from_response(scmc_area->response.code);
 809         if (ret) {
 810                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 811                               scmc_area->response.code);
 812                 goto out;
 813         }
 814         if (scmc_area->not_valid) {
 815                 chp->cmg = -1;
 816                 chp->shared = -1;
 817                 goto out;
 818         }
 819         chp->cmg = scmc_area->cmg;
 820         chp->shared = scmc_area->shared;
 821         if (chp->cmg != 2 && chp->cmg != 3) {
 822                 /* No cmg-dependent data. */
 823                 goto out;
 824         }
 825         chp->cmg_chars = cmg_chars;
 826         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 827                                   (struct cmg_chars *) &scmc_area->data);
 828 out:
 829         spin_unlock_irq(&chsc_page_lock);
 830         if (!chp->cmg_chars)
 831                 kfree(cmg_chars);
 832
 833         return ret;
 834 }
 835
 836 int __init chsc_init(void)
 837 {
 838         int ret;
 839
 840         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 841         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 842         if (!sei_page || !chsc_page) {
 843                 ret = -ENOMEM;
 844                 goto out_err;
 845         }
 846         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
 847         if (ret)
 848                 goto out_err;
 849         return ret;
 850 out_err:
 851         free_page((unsigned long)chsc_page);
 852         free_page((unsigned long)sei_page);
 853         return ret;
 854 }
 855
 856 void __init chsc_init_cleanup(void)
 857 {
 858         crw_unregister_handler(CRW_RSC_CSS);
 859         free_page((unsigned long)chsc_page);
 860         free_page((unsigned long)sei_page);
 861 }
 862
 863 int chsc_enable_facility(int operation_code)
 864 {
 865         unsigned long flags;
 866         int ret;
 867         struct {
 868                 struct chsc_header request;
 869                 u8 reserved1:4;
 870                 u8 format:4;
 871                 u8 reserved2;
 872                 u16 operation_code;
 873                 u32 reserved3;
 874                 u32 reserved4;
 875                 u32 operation_data_area[252];
 876                 struct chsc_header response;
 877                 u32 reserved5:4;
 878                 u32 format2:4;
 879                 u32 reserved6:24;
 880         } __attribute__ ((packed)) *sda_area;
 881
 882         spin_lock_irqsave(&chsc_page_lock, flags);
 883         memset(chsc_page, 0, PAGE_SIZE);
 884         sda_area = chsc_page;
 885         sda_area->request.length = 0x0400;
 886         sda_area->request.code = 0x0031;
 887         sda_area->operation_code = operation_code;
 888
 889         ret = chsc(sda_area);
 890         if (ret > 0) {
 891                 ret = (ret == 3) ? -ENODEV : -EBUSY;
 892                 goto out;
 893         }
 894
 895         switch (sda_area->response.code) {
 896         case 0x0101:
 897                 ret = -EOPNOTSUPP;
 898                 break;
 899         default:
 900                 ret = chsc_error_from_response(sda_area->response.code);
 901         }
 902         if (ret != 0)
 903                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
 904                               operation_code, sda_area->response.code);
 905 out:
 906         spin_unlock_irqrestore(&chsc_page_lock, flags);
 907         return ret;
 908 }
 909
 910 struct css_general_char css_general_characteristics;
 911 struct css_chsc_char css_chsc_characteristics;
 912
 913 int __init
 914 chsc_determine_css_characteristics(void)
 915 {
 916         int result;
 917         struct {
 918                 struct chsc_header request;
 919                 u32 reserved1;
 920                 u32 reserved2;
 921                 u32 reserved3;
 922                 struct chsc_header response;
 923                 u32 reserved4;
 924                 u32 general_char[510];
 925                 u32 chsc_char[508];
 926         } __attribute__ ((packed)) *scsc_area;
 927
 928         spin_lock_irq(&chsc_page_lock);
 929         memset(chsc_page, 0, PAGE_SIZE);
 930         scsc_area = chsc_page;
 931         scsc_area->request.length = 0x0010;
 932         scsc_area->request.code = 0x0010;
 933
 934         result = chsc(scsc_area);
 935         if (result) {
 936                 result = (result == 3) ? -ENODEV : -EBUSY;
 937                 goto exit;
 938         }
 939
 940         result = chsc_error_from_response(scsc_area->response.code);
 941         if (result == 0) {
 942                 memcpy(&css_general_characteristics, scsc_area->general_char,
 943                        sizeof(css_general_characteristics));
 944                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
 945                        sizeof(css_chsc_characteristics));
 946         } else
 947                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
 948                               scsc_area->response.code);
 949 exit:
 950         spin_unlock_irq(&chsc_page_lock);
 951         return result;
 952 }
 953
 954 EXPORT_SYMBOL_GPL(css_general_characteristics);
 955 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
 956
 957 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
 958 {
 959         struct {
 960                 struct chsc_header request;
 961                 unsigned int rsvd0;
 962                 unsigned int op : 8;
 963                 unsigned int rsvd1 : 8;
 964                 unsigned int ctrl : 16;
 965                 unsigned int rsvd2[5];
 966                 struct chsc_header response;
 967                 unsigned int rsvd3[7];
 968         } __attribute__ ((packed)) *rr;
 969         int rc;
 970
 971         memset(page, 0, PAGE_SIZE);
 972         rr = page;
 973         rr->request.length = 0x0020;
 974         rr->request.code = 0x0033;
 975         rr->op = op;
 976         rr->ctrl = ctrl;
 977         rc = chsc(rr);
 978         if (rc)
 979                 return -EIO;
 980         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
 981         return rc;
 982 }
 983
 984 int chsc_sstpi(void *page, void *result, size_t size)
 985 {
 986         struct {
 987                 struct chsc_header request;
 988                 unsigned int rsvd0[3];
 989                 struct chsc_header response;
 990                 char data[size];
 991         } __attribute__ ((packed)) *rr;
 992         int rc;
 993
 994         memset(page, 0, PAGE_SIZE);
 995         rr = page;
 996         rr->request.length = 0x0010;
 997         rr->request.code = 0x0038;
 998         rc = chsc(rr);
 999         if (rc)
1000                 return -EIO;
1001         memcpy(result, &rr->data, size);
1002         return (rr->response.code == 0x0001) ? 0 : -EIO;
1003 }
1004
1005 int chsc_siosl(struct subchannel_id schid)
1006 {
1007         struct {
1008                 struct chsc_header request;
1009                 u32 word1;
1010                 struct subchannel_id sid;
1011                 u32 word3;
1012                 struct chsc_header response;
1013                 u32 word[11];
1014         } __attribute__ ((packed)) *siosl_area;
1015         unsigned long flags;
1016         int ccode;
1017         int rc;
1018
1019         spin_lock_irqsave(&chsc_page_lock, flags);
1020         memset(chsc_page, 0, PAGE_SIZE);
1021         siosl_area = chsc_page;
1022         siosl_area->request.length = 0x0010;
1023         siosl_area->request.code = 0x0046;
1024         siosl_area->word1 = 0x80000000;
1025         siosl_area->sid = schid;
1026
1027         ccode = chsc(siosl_area);
1028         if (ccode > 0) {
1029                 if (ccode == 3)
1030                         rc = -ENODEV;
1031                 else
1032                         rc = -EBUSY;
1033                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1034                               schid.ssid, schid.sch_no, ccode);
1035                 goto out;
1036         }
1037         rc = chsc_error_from_response(siosl_area->response.code);
1038         if (rc)
1039                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1040                               schid.ssid, schid.sch_no,
1041                               siosl_area->response.code);
1042         else
1043                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1044                               schid.ssid, schid.sch_no);
1045 out:
1046         spin_unlock_irqrestore(&chsc_page_lock, flags);
1047         return rc;
1048 }
1049 EXPORT_SYMBOL_GPL(chsc_siosl);