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. 1999,2008
   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 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/init.h>
  14 #include <linux/device.h>
  15
  16 #include <asm/cio.h>
  17 #include <asm/chpid.h>
  18 #include <asm/chsc.h>
  19
  20 #include "../s390mach.h"
  21 #include "css.h"
  22 #include "cio.h"
  23 #include "cio_debug.h"
  24 #include "ioasm.h"
  25 #include "chp.h"
  26 #include "chsc.h"
  27
  28 static void *sei_page;
  29
  30 static int chsc_error_from_response(int response)
  31 {
  32         switch (response) {
  33         case 0x0001:
  34                 return 0;
  35         case 0x0002:
  36         case 0x0003:
  37         case 0x0006:
  38         case 0x0007:
  39         case 0x0008:
  40         case 0x000a:
  41                 return -EINVAL;
  42         case 0x0004:
  43                 return -EOPNOTSUPP;
  44         default:
  45                 return -EIO;
  46         }
  47 }
  48
  49 struct chsc_ssd_area {
  50         struct chsc_header request;
  51         u16 :10;
  52         u16 ssid:2;
  53         u16 :4;
  54         u16 f_sch;        /* first subchannel */
  55         u16 :16;
  56         u16 l_sch;        /* last subchannel */
  57         u32 :32;
  58         struct chsc_header response;
  59         u32 :32;
  60         u8 sch_valid : 1;
  61         u8 dev_valid : 1;
  62         u8 st        : 3; /* subchannel type */
  63         u8 zeroes    : 3;
  64         u8  unit_addr;    /* unit address */
  65         u16 devno;        /* device number */
  66         u8 path_mask;
  67         u8 fla_valid_mask;
  68         u16 sch;          /* subchannel */
  69         u8 chpid[8];      /* chpids 0-7 */
  70         u16 fla[8];       /* full link addresses 0-7 */
  71 } __attribute__ ((packed));
  72
  73 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  74 {
  75         unsigned long page;
  76         struct chsc_ssd_area *ssd_area;
  77         int ccode;
  78         int ret;
  79         int i;
  80         int mask;
  81
  82         page = get_zeroed_page(GFP_KERNEL | GFP_DMA);
  83         if (!page)
  84                 return -ENOMEM;
  85         ssd_area = (struct chsc_ssd_area *) page;
  86         ssd_area->request.length = 0x0010;
  87         ssd_area->request.code = 0x0004;
  88         ssd_area->ssid = schid.ssid;
  89         ssd_area->f_sch = schid.sch_no;
  90         ssd_area->l_sch = schid.sch_no;
  91
  92         ccode = chsc(ssd_area);
  93         /* Check response. */
  94         if (ccode > 0) {
  95                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
  96                 goto out_free;
  97         }
  98         ret = chsc_error_from_response(ssd_area->response.code);
  99         if (ret != 0) {
 100                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 101                               schid.ssid, schid.sch_no,
 102                               ssd_area->response.code);
 103                 goto out_free;
 104         }
 105         if (!ssd_area->sch_valid) {
 106                 ret = -ENODEV;
 107                 goto out_free;
 108         }
 109         /* Copy data */
 110         ret = 0;
 111         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 112         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 113             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 114                 goto out_free;
 115         ssd->path_mask = ssd_area->path_mask;
 116         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 117         for (i = 0; i < 8; i++) {
 118                 mask = 0x80 >> i;
 119                 if (ssd_area->path_mask & mask) {
 120                         chp_id_init(&ssd->chpid[i]);
 121                         ssd->chpid[i].id = ssd_area->chpid[i];
 122                 }
 123                 if (ssd_area->fla_valid_mask & mask)
 124                         ssd->fla[i] = ssd_area->fla[i];
 125         }
 126 out_free:
 127         free_page(page);
 128         return ret;
 129 }
 130
 131 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 132 {
 133         spin_lock_irq(sch->lock);
 134         if (sch->driver && sch->driver->chp_event)
 135                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 136                         goto out_unreg;
 137         spin_unlock_irq(sch->lock);
 138         return 0;
 139
 140 out_unreg:
 141         sch->lpm = 0;
 142         spin_unlock_irq(sch->lock);
 143         css_schedule_eval(sch->schid);
 144         return 0;
 145 }
 146
 147 void chsc_chp_offline(struct chp_id chpid)
 148 {
 149         char dbf_txt[15];
 150         struct chp_link link;
 151
 152         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 153         CIO_TRACE_EVENT(2, dbf_txt);
 154
 155         if (chp_get_status(chpid) <= 0)
 156                 return;
 157         memset(&link, 0, sizeof(struct chp_link));
 158         link.chpid = chpid;
 159         /* Wait until previous actions have settled. */
 160         css_wait_for_slow_path();
 161         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 162 }
 163
 164 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
 165 {
 166         struct schib schib;
 167         /*
 168          * We don't know the device yet, but since a path
 169          * may be available now to the device we'll have
 170          * to do recognition again.
 171          * Since we don't have any idea about which chpid
 172          * that beast may be on we'll have to do a stsch
 173          * on all devices, grr...
 174          */
 175         if (stsch_err(schid, &schib))
 176                 /* We're through */
 177                 return -ENXIO;
 178
 179         /* Put it on the slow path. */
 180         css_schedule_eval(schid);
 181         return 0;
 182 }
 183
 184 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 185 {
 186         spin_lock_irq(sch->lock);
 187         if (sch->driver && sch->driver->chp_event)
 188                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 189         spin_unlock_irq(sch->lock);
 190
 191         return 0;
 192 }
 193
 194 static void s390_process_res_acc(struct chp_link *link)
 195 {
 196         char dbf_txt[15];
 197
 198         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 199                 link->chpid.id);
 200         CIO_TRACE_EVENT( 2, dbf_txt);
 201         if (link->fla != 0) {
 202                 sprintf(dbf_txt, "fla%x", link->fla);
 203                 CIO_TRACE_EVENT( 2, dbf_txt);
 204         }
 205         /* Wait until previous actions have settled. */
 206         css_wait_for_slow_path();
 207         /*
 208          * I/O resources may have become accessible.
 209          * Scan through all subchannels that may be concerned and
 210          * do a validation on those.
 211          * The more information we have (info), the less scanning
 212          * will we have to do.
 213          */
 214         for_each_subchannel_staged(__s390_process_res_acc,
 215                                    s390_process_res_acc_new_sch, link);
 216 }
 217
 218 static int
 219 __get_chpid_from_lir(void *data)
 220 {
 221         struct lir {
 222                 u8  iq;
 223                 u8  ic;
 224                 u16 sci;
 225                 /* incident-node descriptor */
 226                 u32 indesc[28];
 227                 /* attached-node descriptor */
 228                 u32 andesc[28];
 229                 /* incident-specific information */
 230                 u32 isinfo[28];
 231         } __attribute__ ((packed)) *lir;
 232
 233         lir = data;
 234         if (!(lir->iq&0x80))
 235                 /* NULL link incident record */
 236                 return -EINVAL;
 237         if (!(lir->indesc[0]&0xc0000000))
 238                 /* node descriptor not valid */
 239                 return -EINVAL;
 240         if (!(lir->indesc[0]&0x10000000))
 241                 /* don't handle device-type nodes - FIXME */
 242                 return -EINVAL;
 243         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
 244
 245         return (u16) (lir->indesc[0]&0x000000ff);
 246 }
 247
 248 struct chsc_sei_area {
 249         struct chsc_header request;
 250         u32 reserved1;
 251         u32 reserved2;
 252         u32 reserved3;
 253         struct chsc_header response;
 254         u32 reserved4;
 255         u8  flags;
 256         u8  vf;         /* validity flags */
 257         u8  rs;         /* reporting source */
 258         u8  cc;         /* content code */
 259         u16 fla;        /* full link address */
 260         u16 rsid;       /* reporting source id */
 261         u32 reserved5;
 262         u32 reserved6;
 263         u8 ccdf[4096 - 16 - 24];        /* content-code dependent field */
 264         /* ccdf has to be big enough for a link-incident record */
 265 } __attribute__ ((packed));
 266
 267 static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
 268 {
 269         struct chp_id chpid;
 270         int id;
 271
 272         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
 273                       sei_area->rs, sei_area->rsid);
 274         if (sei_area->rs != 4)
 275                 return;
 276         id = __get_chpid_from_lir(sei_area->ccdf);
 277         if (id < 0)
 278                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
 279         else {
 280                 chp_id_init(&chpid);
 281                 chpid.id = id;
 282                 chsc_chp_offline(chpid);
 283         }
 284 }
 285
 286 static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
 287 {
 288         struct chp_link link;
 289         struct chp_id chpid;
 290         int status;
 291
 292         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 293                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 294         if (sei_area->rs != 4)
 295                 return;
 296         chp_id_init(&chpid);
 297         chpid.id = sei_area->rsid;
 298         /* allocate a new channel path structure, if needed */
 299         status = chp_get_status(chpid);
 300         if (status < 0)
 301                 chp_new(chpid);
 302         else if (!status)
 303                 return;
 304         memset(&link, 0, sizeof(struct chp_link));
 305         link.chpid = chpid;
 306         if ((sei_area->vf & 0xc0) != 0) {
 307                 link.fla = sei_area->fla;
 308                 if ((sei_area->vf & 0xc0) == 0xc0)
 309                         /* full link address */
 310                         link.fla_mask = 0xffff;
 311                 else
 312                         /* link address */
 313                         link.fla_mask = 0xff00;
 314         }
 315         s390_process_res_acc(&link);
 316 }
 317
 318 struct chp_config_data {
 319         u8 map[32];
 320         u8 op;
 321         u8 pc;
 322 };
 323
 324 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
 325 {
 326         struct chp_config_data *data;
 327         struct chp_id chpid;
 328         int num;
 329
 330         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 331         if (sei_area->rs != 0)
 332                 return;
 333         data = (struct chp_config_data *) &(sei_area->ccdf);
 334         chp_id_init(&chpid);
 335         for (num = 0; num <= __MAX_CHPID; num++) {
 336                 if (!chp_test_bit(data->map, num))
 337                         continue;
 338                 chpid.id = num;
 339                 printk(KERN_WARNING "cio: processing configure event %d for "
 340                        "chpid %x.%02x\n", data->op, chpid.cssid, chpid.id);
 341                 switch (data->op) {
 342                 case 0:
 343                         chp_cfg_schedule(chpid, 1);
 344                         break;
 345                 case 1:
 346                         chp_cfg_schedule(chpid, 0);
 347                         break;
 348                 case 2:
 349                         chp_cfg_cancel_deconfigure(chpid);
 350                         break;
 351                 }
 352         }
 353 }
 354
 355 static void chsc_process_sei(struct chsc_sei_area *sei_area)
 356 {
 357         /* Check if we might have lost some information. */
 358         if (sei_area->flags & 0x40) {
 359                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 360                 css_schedule_eval_all();
 361         }
 362         /* which kind of information was stored? */
 363         switch (sei_area->cc) {
 364         case 1: /* link incident*/
 365                 chsc_process_sei_link_incident(sei_area);
 366                 break;
 367         case 2: /* i/o resource accessibiliy */
 368                 chsc_process_sei_res_acc(sei_area);
 369                 break;
 370         case 8: /* channel-path-configuration notification */
 371                 chsc_process_sei_chp_config(sei_area);
 372                 break;
 373         default: /* other stuff */
 374                 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
 375                               sei_area->cc);
 376                 break;
 377         }
 378 }
 379
 380 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 381 {
 382         struct chsc_sei_area *sei_area;
 383
 384         if (overflow) {
 385                 css_schedule_eval_all();
 386                 return;
 387         }
 388         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 389                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 390                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 391                       crw0->erc, crw0->rsid);
 392         if (!sei_page)
 393                 return;
 394         /* Access to sei_page is serialized through machine check handler
 395          * thread, so no need for locking. */
 396         sei_area = sei_page;
 397
 398         CIO_TRACE_EVENT(2, "prcss");
 399         do {
 400                 memset(sei_area, 0, sizeof(*sei_area));
 401                 sei_area->request.length = 0x0010;
 402                 sei_area->request.code = 0x000e;
 403                 if (chsc(sei_area))
 404                         break;
 405
 406                 if (sei_area->response.code == 0x0001) {
 407                         CIO_CRW_EVENT(4, "chsc: sei successful\n");
 408                         chsc_process_sei(sei_area);
 409                 } else {
 410                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 411                                       sei_area->response.code);
 412                         break;
 413                 }
 414         } while (sei_area->flags & 0x80);
 415 }
 416
 417 void chsc_chp_online(struct chp_id chpid)
 418 {
 419         char dbf_txt[15];
 420         struct chp_link link;
 421
 422         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 423         CIO_TRACE_EVENT(2, dbf_txt);
 424
 425         if (chp_get_status(chpid) != 0) {
 426                 memset(&link, 0, sizeof(struct chp_link));
 427                 link.chpid = chpid;
 428                 /* Wait until previous actions have settled. */
 429                 css_wait_for_slow_path();
 430                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 431                                            &link);
 432         }
 433 }
 434
 435 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 436                                          struct chp_id chpid, int on)
 437 {
 438         unsigned long flags;
 439         struct chp_link link;
 440
 441         memset(&link, 0, sizeof(struct chp_link));
 442         link.chpid = chpid;
 443         spin_lock_irqsave(sch->lock, flags);
 444         if (sch->driver && sch->driver->chp_event)
 445                 sch->driver->chp_event(sch, &link,
 446                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 447         spin_unlock_irqrestore(sch->lock, flags);
 448 }
 449
 450 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 451 {
 452         struct chp_id *chpid = data;
 453
 454         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 455         return 0;
 456 }
 457
 458 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 459 {
 460         struct chp_id *chpid = data;
 461
 462         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 463         return 0;
 464 }
 465
 466 static int
 467 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 468 {
 469         struct schib schib;
 470
 471         if (stsch_err(schid, &schib))
 472                 /* We're through */
 473                 return -ENXIO;
 474         /* Put it on the slow path. */
 475         css_schedule_eval(schid);
 476         return 0;
 477 }
 478
 479 /**
 480  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 481  * @chpid: channl-path ID
 482  * @on: non-zero for vary online, zero for vary offline
 483  */
 484 int chsc_chp_vary(struct chp_id chpid, int on)
 485 {
 486         struct chp_link link;
 487
 488         memset(&link, 0, sizeof(struct chp_link));
 489         link.chpid = chpid;
 490         /* Wait until previous actions have settled. */
 491         css_wait_for_slow_path();
 492         /*
 493          * Redo PathVerification on the devices the chpid connects to
 494          */
 495
 496         if (on)
 497                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 498                                            __s390_vary_chpid_on, &link);
 499         else
 500                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 501                                            NULL, &link);
 502
 503         return 0;
 504 }
 505
 506 static void
 507 chsc_remove_cmg_attr(struct channel_subsystem *css)
 508 {
 509         int i;
 510
 511         for (i = 0; i <= __MAX_CHPID; i++) {
 512                 if (!css->chps[i])
 513                         continue;
 514                 chp_remove_cmg_attr(css->chps[i]);
 515         }
 516 }
 517
 518 static int
 519 chsc_add_cmg_attr(struct channel_subsystem *css)
 520 {
 521         int i, ret;
 522
 523         ret = 0;
 524         for (i = 0; i <= __MAX_CHPID; i++) {
 525                 if (!css->chps[i])
 526                         continue;
 527                 ret = chp_add_cmg_attr(css->chps[i]);
 528                 if (ret)
 529                         goto cleanup;
 530         }
 531         return ret;
 532 cleanup:
 533         for (--i; i >= 0; i--) {
 534                 if (!css->chps[i])
 535                         continue;
 536                 chp_remove_cmg_attr(css->chps[i]);
 537         }
 538         return ret;
 539 }
 540
 541 static int
 542 __chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
 543 {
 544         struct {
 545                 struct chsc_header request;
 546                 u32 operation_code : 2;
 547                 u32 : 30;
 548                 u32 key : 4;
 549                 u32 : 28;
 550                 u32 zeroes1;
 551                 u32 cub_addr1;
 552                 u32 zeroes2;
 553                 u32 cub_addr2;
 554                 u32 reserved[13];
 555                 struct chsc_header response;
 556                 u32 status : 8;
 557                 u32 : 4;
 558                 u32 fmt : 4;
 559                 u32 : 16;
 560         } __attribute__ ((packed)) *secm_area;
 561         int ret, ccode;
 562
 563         secm_area = page;
 564         secm_area->request.length = 0x0050;
 565         secm_area->request.code = 0x0016;
 566
 567         secm_area->key = PAGE_DEFAULT_KEY;
 568         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 569         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 570
 571         secm_area->operation_code = enable ? 0 : 1;
 572
 573         ccode = chsc(secm_area);
 574         if (ccode > 0)
 575                 return (ccode == 3) ? -ENODEV : -EBUSY;
 576
 577         switch (secm_area->response.code) {
 578         case 0x0102:
 579         case 0x0103:
 580                 ret = -EINVAL;
 581         default:
 582                 ret = chsc_error_from_response(secm_area->response.code);
 583         }
 584         if (ret != 0)
 585                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 586                               secm_area->response.code);
 587         return ret;
 588 }
 589
 590 int
 591 chsc_secm(struct channel_subsystem *css, int enable)
 592 {
 593         void  *secm_area;
 594         int ret;
 595
 596         secm_area = (void *)get_zeroed_page(GFP_KERNEL |  GFP_DMA);
 597         if (!secm_area)
 598                 return -ENOMEM;
 599
 600         if (enable && !css->cm_enabled) {
 601                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 602                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 603                 if (!css->cub_addr1 || !css->cub_addr2) {
 604                         free_page((unsigned long)css->cub_addr1);
 605                         free_page((unsigned long)css->cub_addr2);
 606                         free_page((unsigned long)secm_area);
 607                         return -ENOMEM;
 608                 }
 609         }
 610         ret = __chsc_do_secm(css, enable, secm_area);
 611         if (!ret) {
 612                 css->cm_enabled = enable;
 613                 if (css->cm_enabled) {
 614                         ret = chsc_add_cmg_attr(css);
 615                         if (ret) {
 616                                 memset(secm_area, 0, PAGE_SIZE);
 617                                 __chsc_do_secm(css, 0, secm_area);
 618                                 css->cm_enabled = 0;
 619                         }
 620                 } else
 621                         chsc_remove_cmg_attr(css);
 622         }
 623         if (!css->cm_enabled) {
 624                 free_page((unsigned long)css->cub_addr1);
 625                 free_page((unsigned long)css->cub_addr2);
 626         }
 627         free_page((unsigned long)secm_area);
 628         return ret;
 629 }
 630
 631 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 632                                      int c, int m,
 633                                      struct chsc_response_struct *resp)
 634 {
 635         int ccode, ret;
 636
 637         struct {
 638                 struct chsc_header request;
 639                 u32 : 2;
 640                 u32 m : 1;
 641                 u32 c : 1;
 642                 u32 fmt : 4;
 643                 u32 cssid : 8;
 644                 u32 : 4;
 645                 u32 rfmt : 4;
 646                 u32 first_chpid : 8;
 647                 u32 : 24;
 648                 u32 last_chpid : 8;
 649                 u32 zeroes1;
 650                 struct chsc_header response;
 651                 u8 data[PAGE_SIZE - 20];
 652         } __attribute__ ((packed)) *scpd_area;
 653
 654         if ((rfmt == 1) && !css_general_characteristics.fcs)
 655                 return -EINVAL;
 656         if ((rfmt == 2) && !css_general_characteristics.cib)
 657                 return -EINVAL;
 658         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 659         if (!scpd_area)
 660                 return -ENOMEM;
 661
 662         scpd_area->request.length = 0x0010;
 663         scpd_area->request.code = 0x0002;
 664
 665         scpd_area->cssid = chpid.cssid;
 666         scpd_area->first_chpid = chpid.id;
 667         scpd_area->last_chpid = chpid.id;
 668         scpd_area->m = m;
 669         scpd_area->c = c;
 670         scpd_area->fmt = fmt;
 671         scpd_area->rfmt = rfmt;
 672
 673         ccode = chsc(scpd_area);
 674         if (ccode > 0) {
 675                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 676                 goto out;
 677         }
 678
 679         ret = chsc_error_from_response(scpd_area->response.code);
 680         if (ret == 0)
 681                 /* Success. */
 682                 memcpy(resp, &scpd_area->response, scpd_area->response.length);
 683         else
 684                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 685                               scpd_area->response.code);
 686 out:
 687         free_page((unsigned long)scpd_area);
 688         return ret;
 689 }
 690 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 691
 692 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 693                                           struct channel_path_desc *desc)
 694 {
 695         struct chsc_response_struct *chsc_resp;
 696         int ret;
 697
 698         chsc_resp = kzalloc(sizeof(*chsc_resp), GFP_KERNEL);
 699         if (!chsc_resp)
 700                 return -ENOMEM;
 701         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, chsc_resp);
 702         if (ret)
 703                 goto out_free;
 704         memcpy(desc, &chsc_resp->data, chsc_resp->length);
 705 out_free:
 706         kfree(chsc_resp);
 707         return ret;
 708 }
 709
 710 static void
 711 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 712                           struct cmg_chars *chars)
 713 {
 714         switch (chp->cmg) {
 715         case 2:
 716         case 3:
 717                 chp->cmg_chars = kmalloc(sizeof(struct cmg_chars),
 718                                          GFP_KERNEL);
 719                 if (chp->cmg_chars) {
 720                         int i, mask;
 721                         struct cmg_chars *cmg_chars;
 722
 723                         cmg_chars = chp->cmg_chars;
 724                         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 725                                 mask = 0x80 >> (i + 3);
 726                                 if (cmcv & mask)
 727                                         cmg_chars->values[i] = chars->values[i];
 728                                 else
 729                                         cmg_chars->values[i] = 0;
 730                         }
 731                 }
 732                 break;
 733         default:
 734                 /* No cmg-dependent data. */
 735                 break;
 736         }
 737 }
 738
 739 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 740 {
 741         int ccode, ret;
 742
 743         struct {
 744                 struct chsc_header request;
 745                 u32 : 24;
 746                 u32 first_chpid : 8;
 747                 u32 : 24;
 748                 u32 last_chpid : 8;
 749                 u32 zeroes1;
 750                 struct chsc_header response;
 751                 u32 zeroes2;
 752                 u32 not_valid : 1;
 753                 u32 shared : 1;
 754                 u32 : 22;
 755                 u32 chpid : 8;
 756                 u32 cmcv : 5;
 757                 u32 : 11;
 758                 u32 cmgq : 8;
 759                 u32 cmg : 8;
 760                 u32 zeroes3;
 761                 u32 data[NR_MEASUREMENT_CHARS];
 762         } __attribute__ ((packed)) *scmc_area;
 763
 764         scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 765         if (!scmc_area)
 766                 return -ENOMEM;
 767
 768         scmc_area->request.length = 0x0010;
 769         scmc_area->request.code = 0x0022;
 770
 771         scmc_area->first_chpid = chp->chpid.id;
 772         scmc_area->last_chpid = chp->chpid.id;
 773
 774         ccode = chsc(scmc_area);
 775         if (ccode > 0) {
 776                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 777                 goto out;
 778         }
 779
 780         ret = chsc_error_from_response(scmc_area->response.code);
 781         if (ret == 0) {
 782                 /* Success. */
 783                 if (!scmc_area->not_valid) {
 784                         chp->cmg = scmc_area->cmg;
 785                         chp->shared = scmc_area->shared;
 786                         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 787                                                   (struct cmg_chars *)
 788                                                   &scmc_area->data);
 789                 } else {
 790                         chp->cmg = -1;
 791                         chp->shared = -1;
 792                 }
 793         } else {
 794                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 795                               scmc_area->response.code);
 796         }
 797 out:
 798         free_page((unsigned long)scmc_area);
 799         return ret;
 800 }
 801
 802 int __init chsc_alloc_sei_area(void)
 803 {
 804         int ret;
 805
 806         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 807         if (!sei_page) {
 808                 CIO_MSG_EVENT(0, "Can't allocate page for processing of "
 809                               "chsc machine checks!\n");
 810                 return -ENOMEM;
 811         }
 812         ret = s390_register_crw_handler(CRW_RSC_CSS, chsc_process_crw);
 813         if (ret)
 814                 kfree(sei_page);
 815         return ret;
 816 }
 817
 818 void __init chsc_free_sei_area(void)
 819 {
 820         s390_unregister_crw_handler(CRW_RSC_CSS);
 821         kfree(sei_page);
 822 }
 823
 824 int __init
 825 chsc_enable_facility(int operation_code)
 826 {
 827         int ret;
 828         struct {
 829                 struct chsc_header request;
 830                 u8 reserved1:4;
 831                 u8 format:4;
 832                 u8 reserved2;
 833                 u16 operation_code;
 834                 u32 reserved3;
 835                 u32 reserved4;
 836                 u32 operation_data_area[252];
 837                 struct chsc_header response;
 838                 u32 reserved5:4;
 839                 u32 format2:4;
 840                 u32 reserved6:24;
 841         } __attribute__ ((packed)) *sda_area;
 842
 843         sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
 844         if (!sda_area)
 845                 return -ENOMEM;
 846         sda_area->request.length = 0x0400;
 847         sda_area->request.code = 0x0031;
 848         sda_area->operation_code = operation_code;
 849
 850         ret = chsc(sda_area);
 851         if (ret > 0) {
 852                 ret = (ret == 3) ? -ENODEV : -EBUSY;
 853                 goto out;
 854         }
 855
 856         switch (sda_area->response.code) {
 857         case 0x0101:
 858                 ret = -EOPNOTSUPP;
 859                 break;
 860         default:
 861                 ret = chsc_error_from_response(sda_area->response.code);
 862         }
 863         if (ret != 0)
 864                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
 865                               operation_code, sda_area->response.code);
 866  out:
 867         free_page((unsigned long)sda_area);
 868         return ret;
 869 }
 870
 871 struct css_general_char css_general_characteristics;
 872 struct css_chsc_char css_chsc_characteristics;
 873
 874 int __init
 875 chsc_determine_css_characteristics(void)
 876 {
 877         int result;
 878         struct {
 879                 struct chsc_header request;
 880                 u32 reserved1;
 881                 u32 reserved2;
 882                 u32 reserved3;
 883                 struct chsc_header response;
 884                 u32 reserved4;
 885                 u32 general_char[510];
 886                 u32 chsc_char[518];
 887         } __attribute__ ((packed)) *scsc_area;
 888
 889         scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 890         if (!scsc_area)
 891                 return -ENOMEM;
 892
 893         scsc_area->request.length = 0x0010;
 894         scsc_area->request.code = 0x0010;
 895
 896         result = chsc(scsc_area);
 897         if (result) {
 898                 result = (result == 3) ? -ENODEV : -EBUSY;
 899                 goto exit;
 900         }
 901
 902         result = chsc_error_from_response(scsc_area->response.code);
 903         if (result == 0) {
 904                 memcpy(&css_general_characteristics, scsc_area->general_char,
 905                        sizeof(css_general_characteristics));
 906                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
 907                        sizeof(css_chsc_characteristics));
 908         } else
 909                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
 910                               scsc_area->response.code);
 911 exit:
 912         free_page ((unsigned long) scsc_area);
 913         return result;
 914 }
 915
 916 EXPORT_SYMBOL_GPL(css_general_characteristics);
 917 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
 918
 919 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
 920 {
 921         struct {
 922                 struct chsc_header request;
 923                 unsigned int rsvd0;
 924                 unsigned int op : 8;
 925                 unsigned int rsvd1 : 8;
 926                 unsigned int ctrl : 16;
 927                 unsigned int rsvd2[5];
 928                 struct chsc_header response;
 929                 unsigned int rsvd3[7];
 930         } __attribute__ ((packed)) *rr;
 931         int rc;
 932
 933         memset(page, 0, PAGE_SIZE);
 934         rr = page;
 935         rr->request.length = 0x0020;
 936         rr->request.code = 0x0033;
 937         rr->op = op;
 938         rr->ctrl = ctrl;
 939         rc = chsc(rr);
 940         if (rc)
 941                 return -EIO;
 942         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
 943         return rc;
 944 }
 945
 946 int chsc_sstpi(void *page, void *result, size_t size)
 947 {
 948         struct {
 949                 struct chsc_header request;
 950                 unsigned int rsvd0[3];
 951                 struct chsc_header response;
 952                 char data[size];
 953         } __attribute__ ((packed)) *rr;
 954         int rc;
 955
 956         memset(page, 0, PAGE_SIZE);
 957         rr = page;
 958         rr->request.length = 0x0010;
 959         rr->request.code = 0x0038;
 960         rc = chsc(rr);
 961         if (rc)
 962                 return -EIO;
 963         memcpy(result, &rr->data, size);
 964         return (rr->response.code == 0x0001) ? 0 : -EIO;
 965 }
 966