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         case 0x000b:
  56                 return -EBUSY;
  57         case 0x0100:
  58         case 0x0102:
  59                 return -ENOMEM;
  60         default:
  61                 return -EIO;
  62         }
  63 }
  64 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  65
  66 struct chsc_ssd_area {
  67         struct chsc_header request;
  68         u16 :10;
  69         u16 ssid:2;
  70         u16 :4;
  71         u16 f_sch;        /* first subchannel */
  72         u16 :16;
  73         u16 l_sch;        /* last subchannel */
  74         u32 :32;
  75         struct chsc_header response;
  76         u32 :32;
  77         u8 sch_valid : 1;
  78         u8 dev_valid : 1;
  79         u8 st        : 3; /* subchannel type */
  80         u8 zeroes    : 3;
  81         u8  unit_addr;    /* unit address */
  82         u16 devno;        /* device number */
  83         u8 path_mask;
  84         u8 fla_valid_mask;
  85         u16 sch;          /* subchannel */
  86         u8 chpid[8];      /* chpids 0-7 */
  87         u16 fla[8];       /* full link addresses 0-7 */
  88 } __attribute__ ((packed));
  89
  90 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  91 {
  92         struct chsc_ssd_area *ssd_area;
  93         int ccode;
  94         int ret;
  95         int i;
  96         int mask;
  97
  98         spin_lock_irq(&chsc_page_lock);
  99         memset(chsc_page, 0, PAGE_SIZE);
 100         ssd_area = chsc_page;
 101         ssd_area->request.length = 0x0010;
 102         ssd_area->request.code = 0x0004;
 103         ssd_area->ssid = schid.ssid;
 104         ssd_area->f_sch = schid.sch_no;
 105         ssd_area->l_sch = schid.sch_no;
 106
 107         ccode = chsc(ssd_area);
 108         /* Check response. */
 109         if (ccode > 0) {
 110                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 111                 goto out;
 112         }
 113         ret = chsc_error_from_response(ssd_area->response.code);
 114         if (ret != 0) {
 115                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 116                               schid.ssid, schid.sch_no,
 117                               ssd_area->response.code);
 118                 goto out;
 119         }
 120         if (!ssd_area->sch_valid) {
 121                 ret = -ENODEV;
 122                 goto out;
 123         }
 124         /* Copy data */
 125         ret = 0;
 126         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 127         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 128             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 129                 goto out;
 130         ssd->path_mask = ssd_area->path_mask;
 131         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 132         for (i = 0; i < 8; i++) {
 133                 mask = 0x80 >> i;
 134                 if (ssd_area->path_mask & mask) {
 135                         chp_id_init(&ssd->chpid[i]);
 136                         ssd->chpid[i].id = ssd_area->chpid[i];
 137                 }
 138                 if (ssd_area->fla_valid_mask & mask)
 139                         ssd->fla[i] = ssd_area->fla[i];
 140         }
 141 out:
 142         spin_unlock_irq(&chsc_page_lock);
 143         return ret;
 144 }
 145
 146 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 147 {
 148         spin_lock_irq(sch->lock);
 149         if (sch->driver && sch->driver->chp_event)
 150                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 151                         goto out_unreg;
 152         spin_unlock_irq(sch->lock);
 153         return 0;
 154
 155 out_unreg:
 156         sch->lpm = 0;
 157         spin_unlock_irq(sch->lock);
 158         css_schedule_eval(sch->schid);
 159         return 0;
 160 }
 161
 162 void chsc_chp_offline(struct chp_id chpid)
 163 {
 164         char dbf_txt[15];
 165         struct chp_link link;
 166
 167         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 168         CIO_TRACE_EVENT(2, dbf_txt);
 169
 170         if (chp_get_status(chpid) <= 0)
 171                 return;
 172         memset(&link, 0, sizeof(struct chp_link));
 173         link.chpid = chpid;
 174         /* Wait until previous actions have settled. */
 175         css_wait_for_slow_path();
 176         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 177 }
 178
 179 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
 180 {
 181         struct schib schib;
 182         /*
 183          * We don't know the device yet, but since a path
 184          * may be available now to the device we'll have
 185          * to do recognition again.
 186          * Since we don't have any idea about which chpid
 187          * that beast may be on we'll have to do a stsch
 188          * on all devices, grr...
 189          */
 190         if (stsch_err(schid, &schib))
 191                 /* We're through */
 192                 return -ENXIO;
 193
 194         /* Put it on the slow path. */
 195         css_schedule_eval(schid);
 196         return 0;
 197 }
 198
 199 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 200 {
 201         spin_lock_irq(sch->lock);
 202         if (sch->driver && sch->driver->chp_event)
 203                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 204         spin_unlock_irq(sch->lock);
 205
 206         return 0;
 207 }
 208
 209 static void s390_process_res_acc(struct chp_link *link)
 210 {
 211         char dbf_txt[15];
 212
 213         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 214                 link->chpid.id);
 215         CIO_TRACE_EVENT( 2, dbf_txt);
 216         if (link->fla != 0) {
 217                 sprintf(dbf_txt, "fla%x", link->fla);
 218                 CIO_TRACE_EVENT( 2, dbf_txt);
 219         }
 220         /* Wait until previous actions have settled. */
 221         css_wait_for_slow_path();
 222         /*
 223          * I/O resources may have become accessible.
 224          * Scan through all subchannels that may be concerned and
 225          * do a validation on those.
 226          * The more information we have (info), the less scanning
 227          * will we have to do.
 228          */
 229         for_each_subchannel_staged(__s390_process_res_acc,
 230                                    s390_process_res_acc_new_sch, link);
 231 }
 232
 233 static int
 234 __get_chpid_from_lir(void *data)
 235 {
 236         struct lir {
 237                 u8  iq;
 238                 u8  ic;
 239                 u16 sci;
 240                 /* incident-node descriptor */
 241                 u32 indesc[28];
 242                 /* attached-node descriptor */
 243                 u32 andesc[28];
 244                 /* incident-specific information */
 245                 u32 isinfo[28];
 246         } __attribute__ ((packed)) *lir;
 247
 248         lir = data;
 249         if (!(lir->iq&0x80))
 250                 /* NULL link incident record */
 251                 return -EINVAL;
 252         if (!(lir->indesc[0]&0xc0000000))
 253                 /* node descriptor not valid */
 254                 return -EINVAL;
 255         if (!(lir->indesc[0]&0x10000000))
 256                 /* don't handle device-type nodes - FIXME */
 257                 return -EINVAL;
 258         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
 259
 260         return (u16) (lir->indesc[0]&0x000000ff);
 261 }
 262
 263 struct chsc_sei_area {
 264         struct chsc_header request;
 265         u32 reserved1;
 266         u32 reserved2;
 267         u32 reserved3;
 268         struct chsc_header response;
 269         u32 reserved4;
 270         u8  flags;
 271         u8  vf;         /* validity flags */
 272         u8  rs;         /* reporting source */
 273         u8  cc;         /* content code */
 274         u16 fla;        /* full link address */
 275         u16 rsid;       /* reporting source id */
 276         u32 reserved5;
 277         u32 reserved6;
 278         u8 ccdf[4096 - 16 - 24];        /* content-code dependent field */
 279         /* ccdf has to be big enough for a link-incident record */
 280 } __attribute__ ((packed));
 281
 282 static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
 283 {
 284         struct chp_id chpid;
 285         int id;
 286
 287         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
 288                       sei_area->rs, sei_area->rsid);
 289         if (sei_area->rs != 4)
 290                 return;
 291         id = __get_chpid_from_lir(sei_area->ccdf);
 292         if (id < 0)
 293                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
 294         else {
 295                 chp_id_init(&chpid);
 296                 chpid.id = id;
 297                 chsc_chp_offline(chpid);
 298         }
 299 }
 300
 301 static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
 302 {
 303         struct chp_link link;
 304         struct chp_id chpid;
 305         int status;
 306
 307         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 308                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 309         if (sei_area->rs != 4)
 310                 return;
 311         chp_id_init(&chpid);
 312         chpid.id = sei_area->rsid;
 313         /* allocate a new channel path structure, if needed */
 314         status = chp_get_status(chpid);
 315         if (status < 0)
 316                 chp_new(chpid);
 317         else if (!status)
 318                 return;
 319         memset(&link, 0, sizeof(struct chp_link));
 320         link.chpid = chpid;
 321         if ((sei_area->vf & 0xc0) != 0) {
 322                 link.fla = sei_area->fla;
 323                 if ((sei_area->vf & 0xc0) == 0xc0)
 324                         /* full link address */
 325                         link.fla_mask = 0xffff;
 326                 else
 327                         /* link address */
 328                         link.fla_mask = 0xff00;
 329         }
 330         s390_process_res_acc(&link);
 331 }
 332
 333 static void chsc_process_sei_chp_avail(struct chsc_sei_area *sei_area)
 334 {
 335         struct channel_path *chp;
 336         struct chp_id chpid;
 337         u8 *data;
 338         int num;
 339
 340         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 341         if (sei_area->rs != 0)
 342                 return;
 343         data = sei_area->ccdf;
 344         chp_id_init(&chpid);
 345         for (num = 0; num <= __MAX_CHPID; num++) {
 346                 if (!chp_test_bit(data, num))
 347                         continue;
 348                 chpid.id = num;
 349
 350                 CIO_CRW_EVENT(4, "Update information for channel path "
 351                               "%x.%02x\n", chpid.cssid, chpid.id);
 352                 chp = chpid_to_chp(chpid);
 353                 if (!chp) {
 354                         chp_new(chpid);
 355                         continue;
 356                 }
 357                 mutex_lock(&chp->lock);
 358                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 359                 mutex_unlock(&chp->lock);
 360         }
 361 }
 362
 363 struct chp_config_data {
 364         u8 map[32];
 365         u8 op;
 366         u8 pc;
 367 };
 368
 369 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
 370 {
 371         struct chp_config_data *data;
 372         struct chp_id chpid;
 373         int num;
 374         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 375
 376         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 377         if (sei_area->rs != 0)
 378                 return;
 379         data = (struct chp_config_data *) &(sei_area->ccdf);
 380         chp_id_init(&chpid);
 381         for (num = 0; num <= __MAX_CHPID; num++) {
 382                 if (!chp_test_bit(data->map, num))
 383                         continue;
 384                 chpid.id = num;
 385                 pr_notice("Processing %s for channel path %x.%02x\n",
 386                           events[data->op], chpid.cssid, chpid.id);
 387                 switch (data->op) {
 388                 case 0:
 389                         chp_cfg_schedule(chpid, 1);
 390                         break;
 391                 case 1:
 392                         chp_cfg_schedule(chpid, 0);
 393                         break;
 394                 case 2:
 395                         chp_cfg_cancel_deconfigure(chpid);
 396                         break;
 397                 }
 398         }
 399 }
 400
 401 static void chsc_process_sei_scm_change(struct chsc_sei_area *sei_area)
 402 {
 403         int ret;
 404
 405         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 406         if (sei_area->rs != 7)
 407                 return;
 408
 409         ret = scm_update_information();
 410         if (ret)
 411                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 412                               " failed (rc=%d).\n", ret);
 413 }
 414
 415 static void chsc_process_sei(struct chsc_sei_area *sei_area)
 416 {
 417         /* Check if we might have lost some information. */
 418         if (sei_area->flags & 0x40) {
 419                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 420                 css_schedule_eval_all();
 421         }
 422         /* which kind of information was stored? */
 423         switch (sei_area->cc) {
 424         case 1: /* link incident*/
 425                 chsc_process_sei_link_incident(sei_area);
 426                 break;
 427         case 2: /* i/o resource accessibility */
 428                 chsc_process_sei_res_acc(sei_area);
 429                 break;
 430         case 7: /* channel-path-availability information */
 431                 chsc_process_sei_chp_avail(sei_area);
 432                 break;
 433         case 8: /* channel-path-configuration notification */
 434                 chsc_process_sei_chp_config(sei_area);
 435                 break;
 436         case 12: /* scm change notification */
 437                 chsc_process_sei_scm_change(sei_area);
 438                 break;
 439         default: /* other stuff */
 440                 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
 441                               sei_area->cc);
 442                 break;
 443         }
 444 }
 445
 446 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 447 {
 448         struct chsc_sei_area *sei_area;
 449
 450         if (overflow) {
 451                 css_schedule_eval_all();
 452                 return;
 453         }
 454         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 455                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 456                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 457                       crw0->erc, crw0->rsid);
 458         if (!sei_page)
 459                 return;
 460         /* Access to sei_page is serialized through machine check handler
 461          * thread, so no need for locking. */
 462         sei_area = sei_page;
 463
 464         CIO_TRACE_EVENT(2, "prcss");
 465         do {
 466                 memset(sei_area, 0, sizeof(*sei_area));
 467                 sei_area->request.length = 0x0010;
 468                 sei_area->request.code = 0x000e;
 469                 if (chsc(sei_area))
 470                         break;
 471
 472                 if (sei_area->response.code == 0x0001) {
 473                         CIO_CRW_EVENT(4, "chsc: sei successful\n");
 474                         chsc_process_sei(sei_area);
 475                 } else {
 476                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 477                                       sei_area->response.code);
 478                         break;
 479                 }
 480         } while (sei_area->flags & 0x80);
 481 }
 482
 483 void chsc_chp_online(struct chp_id chpid)
 484 {
 485         char dbf_txt[15];
 486         struct chp_link link;
 487
 488         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 489         CIO_TRACE_EVENT(2, dbf_txt);
 490
 491         if (chp_get_status(chpid) != 0) {
 492                 memset(&link, 0, sizeof(struct chp_link));
 493                 link.chpid = chpid;
 494                 /* Wait until previous actions have settled. */
 495                 css_wait_for_slow_path();
 496                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 497                                            &link);
 498         }
 499 }
 500
 501 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 502                                          struct chp_id chpid, int on)
 503 {
 504         unsigned long flags;
 505         struct chp_link link;
 506
 507         memset(&link, 0, sizeof(struct chp_link));
 508         link.chpid = chpid;
 509         spin_lock_irqsave(sch->lock, flags);
 510         if (sch->driver && sch->driver->chp_event)
 511                 sch->driver->chp_event(sch, &link,
 512                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 513         spin_unlock_irqrestore(sch->lock, flags);
 514 }
 515
 516 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 517 {
 518         struct chp_id *chpid = data;
 519
 520         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 521         return 0;
 522 }
 523
 524 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 525 {
 526         struct chp_id *chpid = data;
 527
 528         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 529         return 0;
 530 }
 531
 532 static int
 533 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 534 {
 535         struct schib schib;
 536
 537         if (stsch_err(schid, &schib))
 538                 /* We're through */
 539                 return -ENXIO;
 540         /* Put it on the slow path. */
 541         css_schedule_eval(schid);
 542         return 0;
 543 }
 544
 545 /**
 546  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 547  * @chpid: channl-path ID
 548  * @on: non-zero for vary online, zero for vary offline
 549  */
 550 int chsc_chp_vary(struct chp_id chpid, int on)
 551 {
 552         struct channel_path *chp = chpid_to_chp(chpid);
 553
 554         /* Wait until previous actions have settled. */
 555         css_wait_for_slow_path();
 556         /*
 557          * Redo PathVerification on the devices the chpid connects to
 558          */
 559         if (on) {
 560                 /* Try to update the channel path descritor. */
 561                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 562                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 563                                            __s390_vary_chpid_on, &chpid);
 564         } else
 565                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 566                                            NULL, &chpid);
 567
 568         return 0;
 569 }
 570
 571 static void
 572 chsc_remove_cmg_attr(struct channel_subsystem *css)
 573 {
 574         int i;
 575
 576         for (i = 0; i <= __MAX_CHPID; i++) {
 577                 if (!css->chps[i])
 578                         continue;
 579                 chp_remove_cmg_attr(css->chps[i]);
 580         }
 581 }
 582
 583 static int
 584 chsc_add_cmg_attr(struct channel_subsystem *css)
 585 {
 586         int i, ret;
 587
 588         ret = 0;
 589         for (i = 0; i <= __MAX_CHPID; i++) {
 590                 if (!css->chps[i])
 591                         continue;
 592                 ret = chp_add_cmg_attr(css->chps[i]);
 593                 if (ret)
 594                         goto cleanup;
 595         }
 596         return ret;
 597 cleanup:
 598         for (--i; i >= 0; i--) {
 599                 if (!css->chps[i])
 600                         continue;
 601                 chp_remove_cmg_attr(css->chps[i]);
 602         }
 603         return ret;
 604 }
 605
 606 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 607 {
 608         struct {
 609                 struct chsc_header request;
 610                 u32 operation_code : 2;
 611                 u32 : 30;
 612                 u32 key : 4;
 613                 u32 : 28;
 614                 u32 zeroes1;
 615                 u32 cub_addr1;
 616                 u32 zeroes2;
 617                 u32 cub_addr2;
 618                 u32 reserved[13];
 619                 struct chsc_header response;
 620                 u32 status : 8;
 621                 u32 : 4;
 622                 u32 fmt : 4;
 623                 u32 : 16;
 624         } __attribute__ ((packed)) *secm_area;
 625         int ret, ccode;
 626
 627         spin_lock_irq(&chsc_page_lock);
 628         memset(chsc_page, 0, PAGE_SIZE);
 629         secm_area = chsc_page;
 630         secm_area->request.length = 0x0050;
 631         secm_area->request.code = 0x0016;
 632
 633         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 634         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 635         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 636
 637         secm_area->operation_code = enable ? 0 : 1;
 638
 639         ccode = chsc(secm_area);
 640         if (ccode > 0) {
 641                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 642                 goto out;
 643         }
 644
 645         switch (secm_area->response.code) {
 646         case 0x0102:
 647         case 0x0103:
 648                 ret = -EINVAL;
 649                 break;
 650         default:
 651                 ret = chsc_error_from_response(secm_area->response.code);
 652         }
 653         if (ret != 0)
 654                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 655                               secm_area->response.code);
 656 out:
 657         spin_unlock_irq(&chsc_page_lock);
 658         return ret;
 659 }
 660
 661 int
 662 chsc_secm(struct channel_subsystem *css, int enable)
 663 {
 664         int ret;
 665
 666         if (enable && !css->cm_enabled) {
 667                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 668                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 669                 if (!css->cub_addr1 || !css->cub_addr2) {
 670                         free_page((unsigned long)css->cub_addr1);
 671                         free_page((unsigned long)css->cub_addr2);
 672                         return -ENOMEM;
 673                 }
 674         }
 675         ret = __chsc_do_secm(css, enable);
 676         if (!ret) {
 677                 css->cm_enabled = enable;
 678                 if (css->cm_enabled) {
 679                         ret = chsc_add_cmg_attr(css);
 680                         if (ret) {
 681                                 __chsc_do_secm(css, 0);
 682                                 css->cm_enabled = 0;
 683                         }
 684                 } else
 685                         chsc_remove_cmg_attr(css);
 686         }
 687         if (!css->cm_enabled) {
 688                 free_page((unsigned long)css->cub_addr1);
 689                 free_page((unsigned long)css->cub_addr2);
 690         }
 691         return ret;
 692 }
 693
 694 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 695                                      int c, int m, void *page)
 696 {
 697         struct chsc_scpd *scpd_area;
 698         int ccode, ret;
 699
 700         if ((rfmt == 1) && !css_general_characteristics.fcs)
 701                 return -EINVAL;
 702         if ((rfmt == 2) && !css_general_characteristics.cib)
 703                 return -EINVAL;
 704
 705         memset(page, 0, PAGE_SIZE);
 706         scpd_area = page;
 707         scpd_area->request.length = 0x0010;
 708         scpd_area->request.code = 0x0002;
 709         scpd_area->cssid = chpid.cssid;
 710         scpd_area->first_chpid = chpid.id;
 711         scpd_area->last_chpid = chpid.id;
 712         scpd_area->m = m;
 713         scpd_area->c = c;
 714         scpd_area->fmt = fmt;
 715         scpd_area->rfmt = rfmt;
 716
 717         ccode = chsc(scpd_area);
 718         if (ccode > 0)
 719                 return (ccode == 3) ? -ENODEV : -EBUSY;
 720
 721         ret = chsc_error_from_response(scpd_area->response.code);
 722         if (ret)
 723                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 724                               scpd_area->response.code);
 725         return ret;
 726 }
 727 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 728
 729 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 730                                           struct channel_path_desc *desc)
 731 {
 732         struct chsc_response_struct *chsc_resp;
 733         struct chsc_scpd *scpd_area;
 734         unsigned long flags;
 735         int ret;
 736
 737         spin_lock_irqsave(&chsc_page_lock, flags);
 738         scpd_area = chsc_page;
 739         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 740         if (ret)
 741                 goto out;
 742         chsc_resp = (void *)&scpd_area->response;
 743         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 744 out:
 745         spin_unlock_irqrestore(&chsc_page_lock, flags);
 746         return ret;
 747 }
 748
 749 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 750                                           struct channel_path_desc_fmt1 *desc)
 751 {
 752         struct chsc_response_struct *chsc_resp;
 753         struct chsc_scpd *scpd_area;
 754         int ret;
 755
 756         spin_lock_irq(&chsc_page_lock);
 757         scpd_area = chsc_page;
 758         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
 759         if (ret)
 760                 goto out;
 761         chsc_resp = (void *)&scpd_area->response;
 762         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 763 out:
 764         spin_unlock_irq(&chsc_page_lock);
 765         return ret;
 766 }
 767
 768 static void
 769 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 770                           struct cmg_chars *chars)
 771 {
 772         struct cmg_chars *cmg_chars;
 773         int i, mask;
 774
 775         cmg_chars = chp->cmg_chars;
 776         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 777                 mask = 0x80 >> (i + 3);
 778                 if (cmcv & mask)
 779                         cmg_chars->values[i] = chars->values[i];
 780                 else
 781                         cmg_chars->values[i] = 0;
 782         }
 783 }
 784
 785 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 786 {
 787         struct cmg_chars *cmg_chars;
 788         int ccode, ret;
 789
 790         struct {
 791                 struct chsc_header request;
 792                 u32 : 24;
 793                 u32 first_chpid : 8;
 794                 u32 : 24;
 795                 u32 last_chpid : 8;
 796                 u32 zeroes1;
 797                 struct chsc_header response;
 798                 u32 zeroes2;
 799                 u32 not_valid : 1;
 800                 u32 shared : 1;
 801                 u32 : 22;
 802                 u32 chpid : 8;
 803                 u32 cmcv : 5;
 804                 u32 : 11;
 805                 u32 cmgq : 8;
 806                 u32 cmg : 8;
 807                 u32 zeroes3;
 808                 u32 data[NR_MEASUREMENT_CHARS];
 809         } __attribute__ ((packed)) *scmc_area;
 810
 811         chp->cmg_chars = NULL;
 812         cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
 813         if (!cmg_chars)
 814                 return -ENOMEM;
 815
 816         spin_lock_irq(&chsc_page_lock);
 817         memset(chsc_page, 0, PAGE_SIZE);
 818         scmc_area = chsc_page;
 819         scmc_area->request.length = 0x0010;
 820         scmc_area->request.code = 0x0022;
 821         scmc_area->first_chpid = chp->chpid.id;
 822         scmc_area->last_chpid = chp->chpid.id;
 823
 824         ccode = chsc(scmc_area);
 825         if (ccode > 0) {
 826                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 827                 goto out;
 828         }
 829
 830         ret = chsc_error_from_response(scmc_area->response.code);
 831         if (ret) {
 832                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 833                               scmc_area->response.code);
 834                 goto out;
 835         }
 836         if (scmc_area->not_valid) {
 837                 chp->cmg = -1;
 838                 chp->shared = -1;
 839                 goto out;
 840         }
 841         chp->cmg = scmc_area->cmg;
 842         chp->shared = scmc_area->shared;
 843         if (chp->cmg != 2 && chp->cmg != 3) {
 844                 /* No cmg-dependent data. */
 845                 goto out;
 846         }
 847         chp->cmg_chars = cmg_chars;
 848         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 849                                   (struct cmg_chars *) &scmc_area->data);
 850 out:
 851         spin_unlock_irq(&chsc_page_lock);
 852         if (!chp->cmg_chars)
 853                 kfree(cmg_chars);
 854
 855         return ret;
 856 }
 857
 858 int __init chsc_init(void)
 859 {
 860         int ret;
 861
 862         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 863         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 864         if (!sei_page || !chsc_page) {
 865                 ret = -ENOMEM;
 866                 goto out_err;
 867         }
 868         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
 869         if (ret)
 870                 goto out_err;
 871         return ret;
 872 out_err:
 873         free_page((unsigned long)chsc_page);
 874         free_page((unsigned long)sei_page);
 875         return ret;
 876 }
 877
 878 void __init chsc_init_cleanup(void)
 879 {
 880         crw_unregister_handler(CRW_RSC_CSS);
 881         free_page((unsigned long)chsc_page);
 882         free_page((unsigned long)sei_page);
 883 }
 884
 885 int chsc_enable_facility(int operation_code)
 886 {
 887         unsigned long flags;
 888         int ret;
 889         struct {
 890                 struct chsc_header request;
 891                 u8 reserved1:4;
 892                 u8 format:4;
 893                 u8 reserved2;
 894                 u16 operation_code;
 895                 u32 reserved3;
 896                 u32 reserved4;
 897                 u32 operation_data_area[252];
 898                 struct chsc_header response;
 899                 u32 reserved5:4;
 900                 u32 format2:4;
 901                 u32 reserved6:24;
 902         } __attribute__ ((packed)) *sda_area;
 903
 904         spin_lock_irqsave(&chsc_page_lock, flags);
 905         memset(chsc_page, 0, PAGE_SIZE);
 906         sda_area = chsc_page;
 907         sda_area->request.length = 0x0400;
 908         sda_area->request.code = 0x0031;
 909         sda_area->operation_code = operation_code;
 910
 911         ret = chsc(sda_area);
 912         if (ret > 0) {
 913                 ret = (ret == 3) ? -ENODEV : -EBUSY;
 914                 goto out;
 915         }
 916
 917         switch (sda_area->response.code) {
 918         case 0x0101:
 919                 ret = -EOPNOTSUPP;
 920                 break;
 921         default:
 922                 ret = chsc_error_from_response(sda_area->response.code);
 923         }
 924         if (ret != 0)
 925                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
 926                               operation_code, sda_area->response.code);
 927 out:
 928         spin_unlock_irqrestore(&chsc_page_lock, flags);
 929         return ret;
 930 }
 931
 932 struct css_general_char css_general_characteristics;
 933 struct css_chsc_char css_chsc_characteristics;
 934
 935 int __init
 936 chsc_determine_css_characteristics(void)
 937 {
 938         int result;
 939         struct {
 940                 struct chsc_header request;
 941                 u32 reserved1;
 942                 u32 reserved2;
 943                 u32 reserved3;
 944                 struct chsc_header response;
 945                 u32 reserved4;
 946                 u32 general_char[510];
 947                 u32 chsc_char[508];
 948         } __attribute__ ((packed)) *scsc_area;
 949
 950         spin_lock_irq(&chsc_page_lock);
 951         memset(chsc_page, 0, PAGE_SIZE);
 952         scsc_area = chsc_page;
 953         scsc_area->request.length = 0x0010;
 954         scsc_area->request.code = 0x0010;
 955
 956         result = chsc(scsc_area);
 957         if (result) {
 958                 result = (result == 3) ? -ENODEV : -EBUSY;
 959                 goto exit;
 960         }
 961
 962         result = chsc_error_from_response(scsc_area->response.code);
 963         if (result == 0) {
 964                 memcpy(&css_general_characteristics, scsc_area->general_char,
 965                        sizeof(css_general_characteristics));
 966                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
 967                        sizeof(css_chsc_characteristics));
 968         } else
 969                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
 970                               scsc_area->response.code);
 971 exit:
 972         spin_unlock_irq(&chsc_page_lock);
 973         return result;
 974 }
 975
 976 EXPORT_SYMBOL_GPL(css_general_characteristics);
 977 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
 978
 979 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
 980 {
 981         struct {
 982                 struct chsc_header request;
 983                 unsigned int rsvd0;
 984                 unsigned int op : 8;
 985                 unsigned int rsvd1 : 8;
 986                 unsigned int ctrl : 16;
 987                 unsigned int rsvd2[5];
 988                 struct chsc_header response;
 989                 unsigned int rsvd3[7];
 990         } __attribute__ ((packed)) *rr;
 991         int rc;
 992
 993         memset(page, 0, PAGE_SIZE);
 994         rr = page;
 995         rr->request.length = 0x0020;
 996         rr->request.code = 0x0033;
 997         rr->op = op;
 998         rr->ctrl = ctrl;
 999         rc = chsc(rr);
1000         if (rc)
1001                 return -EIO;
1002         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1003         return rc;
1004 }
1005
1006 int chsc_sstpi(void *page, void *result, size_t size)
1007 {
1008         struct {
1009                 struct chsc_header request;
1010                 unsigned int rsvd0[3];
1011                 struct chsc_header response;
1012                 char data[size];
1013         } __attribute__ ((packed)) *rr;
1014         int rc;
1015
1016         memset(page, 0, PAGE_SIZE);
1017         rr = page;
1018         rr->request.length = 0x0010;
1019         rr->request.code = 0x0038;
1020         rc = chsc(rr);
1021         if (rc)
1022                 return -EIO;
1023         memcpy(result, &rr->data, size);
1024         return (rr->response.code == 0x0001) ? 0 : -EIO;
1025 }
1026
1027 int chsc_siosl(struct subchannel_id schid)
1028 {
1029         struct {
1030                 struct chsc_header request;
1031                 u32 word1;
1032                 struct subchannel_id sid;
1033                 u32 word3;
1034                 struct chsc_header response;
1035                 u32 word[11];
1036         } __attribute__ ((packed)) *siosl_area;
1037         unsigned long flags;
1038         int ccode;
1039         int rc;
1040
1041         spin_lock_irqsave(&chsc_page_lock, flags);
1042         memset(chsc_page, 0, PAGE_SIZE);
1043         siosl_area = chsc_page;
1044         siosl_area->request.length = 0x0010;
1045         siosl_area->request.code = 0x0046;
1046         siosl_area->word1 = 0x80000000;
1047         siosl_area->sid = schid;
1048
1049         ccode = chsc(siosl_area);
1050         if (ccode > 0) {
1051                 if (ccode == 3)
1052                         rc = -ENODEV;
1053                 else
1054                         rc = -EBUSY;
1055                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1056                               schid.ssid, schid.sch_no, ccode);
1057                 goto out;
1058         }
1059         rc = chsc_error_from_response(siosl_area->response.code);
1060         if (rc)
1061                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1062                               schid.ssid, schid.sch_no,
1063                               siosl_area->response.code);
1064         else
1065                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1066                               schid.ssid, schid.sch_no);
1067 out:
1068         spin_unlock_irqrestore(&chsc_page_lock, flags);
1069         return rc;
1070 }
1071 EXPORT_SYMBOL_GPL(chsc_siosl);
1072
1073 /**
1074  * chsc_scm_info() - store SCM information (SSI)
1075  * @scm_area: request and response block for SSI
1076  * @token: continuation token
1077  *
1078  * Returns 0 on success.
1079  */
1080 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1081 {
1082         int ccode, ret;
1083
1084         memset(scm_area, 0, sizeof(*scm_area));
1085         scm_area->request.length = 0x0020;
1086         scm_area->request.code = 0x004C;
1087         scm_area->reqtok = token;
1088
1089         ccode = chsc(scm_area);
1090         if (ccode > 0) {
1091                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1092                 goto out;
1093         }
1094         ret = chsc_error_from_response(scm_area->response.code);
1095         if (ret != 0)
1096                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1097                               scm_area->response.code);
1098 out:
1099         return ret;
1100 }
1101 EXPORT_SYMBOL_GPL(chsc_scm_info);