drivers/s390/cio/chsc.c

   1 /*
   2  *   S/390 common I/O routines -- channel subsystem call
   3  *
   4  *    Copyright IBM Corp. 1999,2012
   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 #include <linux/pci.h>
  18
  19 #include <asm/cio.h>
  20 #include <asm/chpid.h>
  21 #include <asm/chsc.h>
  22 #include <asm/crw.h>
  23
  24 #include "css.h"
  25 #include "cio.h"
  26 #include "cio_debug.h"
  27 #include "ioasm.h"
  28 #include "chp.h"
  29 #include "chsc.h"
  30
  31 static void *sei_page;
  32 static void *chsc_page;
  33 static DEFINE_SPINLOCK(chsc_page_lock);
  34
  35 /**
  36  * chsc_error_from_response() - convert a chsc response to an error
  37  * @response: chsc response code
  38  *
  39  * Returns an appropriate Linux error code for @response.
  40  */
  41 int chsc_error_from_response(int response)
  42 {
  43         switch (response) {
  44         case 0x0001:
  45                 return 0;
  46         case 0x0002:
  47         case 0x0003:
  48         case 0x0006:
  49         case 0x0007:
  50         case 0x0008:
  51         case 0x000a:
  52         case 0x0104:
  53                 return -EINVAL;
  54         case 0x0004:
  55                 return -EOPNOTSUPP;
  56         case 0x000b:
  57                 return -EBUSY;
  58         case 0x0100:
  59         case 0x0102:
  60                 return -ENOMEM;
  61         default:
  62                 return -EIO;
  63         }
  64 }
  65 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  66
  67 struct chsc_ssd_area {
  68         struct chsc_header request;
  69         u16 :10;
  70         u16 ssid:2;
  71         u16 :4;
  72         u16 f_sch;        /* first subchannel */
  73         u16 :16;
  74         u16 l_sch;        /* last subchannel */
  75         u32 :32;
  76         struct chsc_header response;
  77         u32 :32;
  78         u8 sch_valid : 1;
  79         u8 dev_valid : 1;
  80         u8 st        : 3; /* subchannel type */
  81         u8 zeroes    : 3;
  82         u8  unit_addr;    /* unit address */
  83         u16 devno;        /* device number */
  84         u8 path_mask;
  85         u8 fla_valid_mask;
  86         u16 sch;          /* subchannel */
  87         u8 chpid[8];      /* chpids 0-7 */
  88         u16 fla[8];       /* full link addresses 0-7 */
  89 } __attribute__ ((packed));
  90
  91 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  92 {
  93         struct chsc_ssd_area *ssd_area;
  94         int ccode;
  95         int ret;
  96         int i;
  97         int mask;
  98
  99         spin_lock_irq(&chsc_page_lock);
 100         memset(chsc_page, 0, PAGE_SIZE);
 101         ssd_area = chsc_page;
 102         ssd_area->request.length = 0x0010;
 103         ssd_area->request.code = 0x0004;
 104         ssd_area->ssid = schid.ssid;
 105         ssd_area->f_sch = schid.sch_no;
 106         ssd_area->l_sch = schid.sch_no;
 107
 108         ccode = chsc(ssd_area);
 109         /* Check response. */
 110         if (ccode > 0) {
 111                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 112                 goto out;
 113         }
 114         ret = chsc_error_from_response(ssd_area->response.code);
 115         if (ret != 0) {
 116                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 117                               schid.ssid, schid.sch_no,
 118                               ssd_area->response.code);
 119                 goto out;
 120         }
 121         if (!ssd_area->sch_valid) {
 122                 ret = -ENODEV;
 123                 goto out;
 124         }
 125         /* Copy data */
 126         ret = 0;
 127         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 128         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 129             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 130                 goto out;
 131         ssd->path_mask = ssd_area->path_mask;
 132         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 133         for (i = 0; i < 8; i++) {
 134                 mask = 0x80 >> i;
 135                 if (ssd_area->path_mask & mask) {
 136                         chp_id_init(&ssd->chpid[i]);
 137                         ssd->chpid[i].id = ssd_area->chpid[i];
 138                 }
 139                 if (ssd_area->fla_valid_mask & mask)
 140                         ssd->fla[i] = ssd_area->fla[i];
 141         }
 142 out:
 143         spin_unlock_irq(&chsc_page_lock);
 144         return ret;
 145 }
 146
 147 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 148 {
 149         spin_lock_irq(sch->lock);
 150         if (sch->driver && sch->driver->chp_event)
 151                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 152                         goto out_unreg;
 153         spin_unlock_irq(sch->lock);
 154         return 0;
 155
 156 out_unreg:
 157         sch->lpm = 0;
 158         spin_unlock_irq(sch->lock);
 159         css_schedule_eval(sch->schid);
 160         return 0;
 161 }
 162
 163 void chsc_chp_offline(struct chp_id chpid)
 164 {
 165         char dbf_txt[15];
 166         struct chp_link link;
 167
 168         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 169         CIO_TRACE_EVENT(2, dbf_txt);
 170
 171         if (chp_get_status(chpid) <= 0)
 172                 return;
 173         memset(&link, 0, sizeof(struct chp_link));
 174         link.chpid = chpid;
 175         /* Wait until previous actions have settled. */
 176         css_wait_for_slow_path();
 177         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 178 }
 179
 180 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
 181 {
 182         struct schib schib;
 183         /*
 184          * We don't know the device yet, but since a path
 185          * may be available now to the device we'll have
 186          * to do recognition again.
 187          * Since we don't have any idea about which chpid
 188          * that beast may be on we'll have to do a stsch
 189          * on all devices, grr...
 190          */
 191         if (stsch_err(schid, &schib))
 192                 /* We're through */
 193                 return -ENXIO;
 194
 195         /* Put it on the slow path. */
 196         css_schedule_eval(schid);
 197         return 0;
 198 }
 199
 200 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 201 {
 202         spin_lock_irq(sch->lock);
 203         if (sch->driver && sch->driver->chp_event)
 204                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 205         spin_unlock_irq(sch->lock);
 206
 207         return 0;
 208 }
 209
 210 static void s390_process_res_acc(struct chp_link *link)
 211 {
 212         char dbf_txt[15];
 213
 214         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 215                 link->chpid.id);
 216         CIO_TRACE_EVENT( 2, dbf_txt);
 217         if (link->fla != 0) {
 218                 sprintf(dbf_txt, "fla%x", link->fla);
 219                 CIO_TRACE_EVENT( 2, dbf_txt);
 220         }
 221         /* Wait until previous actions have settled. */
 222         css_wait_for_slow_path();
 223         /*
 224          * I/O resources may have become accessible.
 225          * Scan through all subchannels that may be concerned and
 226          * do a validation on those.
 227          * The more information we have (info), the less scanning
 228          * will we have to do.
 229          */
 230         for_each_subchannel_staged(__s390_process_res_acc,
 231                                    s390_process_res_acc_new_sch, link);
 232 }
 233
 234 static int
 235 __get_chpid_from_lir(void *data)
 236 {
 237         struct lir {
 238                 u8  iq;
 239                 u8  ic;
 240                 u16 sci;
 241                 /* incident-node descriptor */
 242                 u32 indesc[28];
 243                 /* attached-node descriptor */
 244                 u32 andesc[28];
 245                 /* incident-specific information */
 246                 u32 isinfo[28];
 247         } __attribute__ ((packed)) *lir;
 248
 249         lir = data;
 250         if (!(lir->iq&0x80))
 251                 /* NULL link incident record */
 252                 return -EINVAL;
 253         if (!(lir->indesc[0]&0xc0000000))
 254                 /* node descriptor not valid */
 255                 return -EINVAL;
 256         if (!(lir->indesc[0]&0x10000000))
 257                 /* don't handle device-type nodes - FIXME */
 258                 return -EINVAL;
 259         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
 260
 261         return (u16) (lir->indesc[0]&0x000000ff);
 262 }
 263
 264 struct chsc_sei_nt0_area {
 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 reserved1;
 272         u32 reserved2;
 273         /* ccdf has to be big enough for a link-incident record */
 274         u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 275 } __packed;
 276
 277 struct chsc_sei_nt2_area {
 278         u8  flags;                      /* p and v bit */
 279         u8  reserved1;
 280         u8  reserved2;
 281         u8  cc;                         /* content code */
 282         u32 reserved3[13];
 283         u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 284 } __packed;
 285
 286 #define CHSC_SEI_NT0    (1ULL << 63)
 287 #define CHSC_SEI_NT2    (1ULL << 61)
 288
 289 struct chsc_sei {
 290         struct chsc_header request;
 291         u32 reserved1;
 292         u64 ntsm;                       /* notification type mask */
 293         struct chsc_header response;
 294         u32 :24;
 295         u8 nt;
 296         union {
 297                 struct chsc_sei_nt0_area nt0_area;
 298                 struct chsc_sei_nt2_area nt2_area;
 299                 u8 nt_area[PAGE_SIZE - 24];
 300         } u;
 301 } __packed;
 302
 303 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 304 {
 305         struct chp_id chpid;
 306         int id;
 307
 308         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
 309                       sei_area->rs, sei_area->rsid);
 310         if (sei_area->rs != 4)
 311                 return;
 312         id = __get_chpid_from_lir(sei_area->ccdf);
 313         if (id < 0)
 314                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
 315         else {
 316                 chp_id_init(&chpid);
 317                 chpid.id = id;
 318                 chsc_chp_offline(chpid);
 319         }
 320 }
 321
 322 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 323 {
 324         struct chp_link link;
 325         struct chp_id chpid;
 326         int status;
 327
 328         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 329                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 330         if (sei_area->rs != 4)
 331                 return;
 332         chp_id_init(&chpid);
 333         chpid.id = sei_area->rsid;
 334         /* allocate a new channel path structure, if needed */
 335         status = chp_get_status(chpid);
 336         if (status < 0)
 337                 chp_new(chpid);
 338         else if (!status)
 339                 return;
 340         memset(&link, 0, sizeof(struct chp_link));
 341         link.chpid = chpid;
 342         if ((sei_area->vf & 0xc0) != 0) {
 343                 link.fla = sei_area->fla;
 344                 if ((sei_area->vf & 0xc0) == 0xc0)
 345                         /* full link address */
 346                         link.fla_mask = 0xffff;
 347                 else
 348                         /* link address */
 349                         link.fla_mask = 0xff00;
 350         }
 351         s390_process_res_acc(&link);
 352 }
 353
 354 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 355 {
 356         struct channel_path *chp;
 357         struct chp_id chpid;
 358         u8 *data;
 359         int num;
 360
 361         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 362         if (sei_area->rs != 0)
 363                 return;
 364         data = sei_area->ccdf;
 365         chp_id_init(&chpid);
 366         for (num = 0; num <= __MAX_CHPID; num++) {
 367                 if (!chp_test_bit(data, num))
 368                         continue;
 369                 chpid.id = num;
 370
 371                 CIO_CRW_EVENT(4, "Update information for channel path "
 372                               "%x.%02x\n", chpid.cssid, chpid.id);
 373                 chp = chpid_to_chp(chpid);
 374                 if (!chp) {
 375                         chp_new(chpid);
 376                         continue;
 377                 }
 378                 mutex_lock(&chp->lock);
 379                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 380                 mutex_unlock(&chp->lock);
 381         }
 382 }
 383
 384 struct chp_config_data {
 385         u8 map[32];
 386         u8 op;
 387         u8 pc;
 388 };
 389
 390 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 391 {
 392         struct chp_config_data *data;
 393         struct chp_id chpid;
 394         int num;
 395         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 396
 397         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 398         if (sei_area->rs != 0)
 399                 return;
 400         data = (struct chp_config_data *) &(sei_area->ccdf);
 401         chp_id_init(&chpid);
 402         for (num = 0; num <= __MAX_CHPID; num++) {
 403                 if (!chp_test_bit(data->map, num))
 404                         continue;
 405                 chpid.id = num;
 406                 pr_notice("Processing %s for channel path %x.%02x\n",
 407                           events[data->op], chpid.cssid, chpid.id);
 408                 switch (data->op) {
 409                 case 0:
 410                         chp_cfg_schedule(chpid, 1);
 411                         break;
 412                 case 1:
 413                         chp_cfg_schedule(chpid, 0);
 414                         break;
 415                 case 2:
 416                         chp_cfg_cancel_deconfigure(chpid);
 417                         break;
 418                 }
 419         }
 420 }
 421
 422 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 423 {
 424         int ret;
 425
 426         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 427         if (sei_area->rs != 7)
 428                 return;
 429
 430         ret = scm_update_information();
 431         if (ret)
 432                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 433                               " failed (rc=%d).\n", ret);
 434 }
 435
 436 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 437 {
 438         int ret;
 439
 440         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 441         if (sei_area->rs != 7)
 442                 return;
 443
 444         ret = scm_process_availability_information();
 445         if (ret)
 446                 CIO_CRW_EVENT(0, "chsc: process availability information"
 447                               " failed (rc=%d).\n", ret);
 448 }
 449
 450 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 451 {
 452         switch (sei_area->cc) {
 453         case 1:
 454                 zpci_event_error(sei_area->ccdf);
 455                 break;
 456         case 2:
 457                 zpci_event_availability(sei_area->ccdf);
 458                 break;
 459         default:
 460                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 461                               sei_area->cc);
 462                 break;
 463         }
 464 }
 465
 466 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 467 {
 468         /* which kind of information was stored? */
 469         switch (sei_area->cc) {
 470         case 1: /* link incident*/
 471                 chsc_process_sei_link_incident(sei_area);
 472                 break;
 473         case 2: /* i/o resource accessibility */
 474                 chsc_process_sei_res_acc(sei_area);
 475                 break;
 476         case 7: /* channel-path-availability information */
 477                 chsc_process_sei_chp_avail(sei_area);
 478                 break;
 479         case 8: /* channel-path-configuration notification */
 480                 chsc_process_sei_chp_config(sei_area);
 481                 break;
 482         case 12: /* scm change notification */
 483                 chsc_process_sei_scm_change(sei_area);
 484                 break;
 485         case 14: /* scm available notification */
 486                 chsc_process_sei_scm_avail(sei_area);
 487                 break;
 488         default: /* other stuff */
 489                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 490                               sei_area->cc);
 491                 break;
 492         }
 493
 494         /* Check if we might have lost some information. */
 495         if (sei_area->flags & 0x40) {
 496                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 497                 css_schedule_eval_all();
 498         }
 499 }
 500
 501 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 502 {
 503         do {
 504                 memset(sei, 0, sizeof(*sei));
 505                 sei->request.length = 0x0010;
 506                 sei->request.code = 0x000e;
 507                 sei->ntsm = ntsm;
 508
 509                 if (chsc(sei))
 510                         break;
 511
 512                 if (sei->response.code != 0x0001) {
 513                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 514                                       sei->response.code);
 515                         break;
 516                 }
 517
 518                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 519                 switch (sei->nt) {
 520                 case 0:
 521                         chsc_process_sei_nt0(&sei->u.nt0_area);
 522                         break;
 523                 case 2:
 524                         chsc_process_sei_nt2(&sei->u.nt2_area);
 525                         break;
 526                 default:
 527                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 528                         break;
 529                 }
 530         } while (sei->u.nt0_area.flags & 0x80);
 531 }
 532
 533 /*
 534  * Handle channel subsystem related CRWs.
 535  * Use store event information to find out what's going on.
 536  *
 537  * Note: Access to sei_page is serialized through machine check handler
 538  * thread, so no need for locking.
 539  */
 540 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 541 {
 542         struct chsc_sei *sei = sei_page;
 543
 544         if (overflow) {
 545                 css_schedule_eval_all();
 546                 return;
 547         }
 548         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 549                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 550                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 551                       crw0->erc, crw0->rsid);
 552
 553         CIO_TRACE_EVENT(2, "prcss");
 554         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 555 }
 556
 557 void chsc_chp_online(struct chp_id chpid)
 558 {
 559         char dbf_txt[15];
 560         struct chp_link link;
 561
 562         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 563         CIO_TRACE_EVENT(2, dbf_txt);
 564
 565         if (chp_get_status(chpid) != 0) {
 566                 memset(&link, 0, sizeof(struct chp_link));
 567                 link.chpid = chpid;
 568                 /* Wait until previous actions have settled. */
 569                 css_wait_for_slow_path();
 570                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 571                                            &link);
 572         }
 573 }
 574
 575 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 576                                          struct chp_id chpid, int on)
 577 {
 578         unsigned long flags;
 579         struct chp_link link;
 580
 581         memset(&link, 0, sizeof(struct chp_link));
 582         link.chpid = chpid;
 583         spin_lock_irqsave(sch->lock, flags);
 584         if (sch->driver && sch->driver->chp_event)
 585                 sch->driver->chp_event(sch, &link,
 586                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 587         spin_unlock_irqrestore(sch->lock, flags);
 588 }
 589
 590 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 591 {
 592         struct chp_id *chpid = data;
 593
 594         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 595         return 0;
 596 }
 597
 598 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 599 {
 600         struct chp_id *chpid = data;
 601
 602         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 603         return 0;
 604 }
 605
 606 static int
 607 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 608 {
 609         struct schib schib;
 610
 611         if (stsch_err(schid, &schib))
 612                 /* We're through */
 613                 return -ENXIO;
 614         /* Put it on the slow path. */
 615         css_schedule_eval(schid);
 616         return 0;
 617 }
 618
 619 /**
 620  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 621  * @chpid: channl-path ID
 622  * @on: non-zero for vary online, zero for vary offline
 623  */
 624 int chsc_chp_vary(struct chp_id chpid, int on)
 625 {
 626         struct channel_path *chp = chpid_to_chp(chpid);
 627
 628         /* Wait until previous actions have settled. */
 629         css_wait_for_slow_path();
 630         /*
 631          * Redo PathVerification on the devices the chpid connects to
 632          */
 633         if (on) {
 634                 /* Try to update the channel path descritor. */
 635                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 636                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 637                                            __s390_vary_chpid_on, &chpid);
 638         } else
 639                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 640                                            NULL, &chpid);
 641
 642         return 0;
 643 }
 644
 645 static void
 646 chsc_remove_cmg_attr(struct channel_subsystem *css)
 647 {
 648         int i;
 649
 650         for (i = 0; i <= __MAX_CHPID; i++) {
 651                 if (!css->chps[i])
 652                         continue;
 653                 chp_remove_cmg_attr(css->chps[i]);
 654         }
 655 }
 656
 657 static int
 658 chsc_add_cmg_attr(struct channel_subsystem *css)
 659 {
 660         int i, ret;
 661
 662         ret = 0;
 663         for (i = 0; i <= __MAX_CHPID; i++) {
 664                 if (!css->chps[i])
 665                         continue;
 666                 ret = chp_add_cmg_attr(css->chps[i]);
 667                 if (ret)
 668                         goto cleanup;
 669         }
 670         return ret;
 671 cleanup:
 672         for (--i; i >= 0; i--) {
 673                 if (!css->chps[i])
 674                         continue;
 675                 chp_remove_cmg_attr(css->chps[i]);
 676         }
 677         return ret;
 678 }
 679
 680 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 681 {
 682         struct {
 683                 struct chsc_header request;
 684                 u32 operation_code : 2;
 685                 u32 : 30;
 686                 u32 key : 4;
 687                 u32 : 28;
 688                 u32 zeroes1;
 689                 u32 cub_addr1;
 690                 u32 zeroes2;
 691                 u32 cub_addr2;
 692                 u32 reserved[13];
 693                 struct chsc_header response;
 694                 u32 status : 8;
 695                 u32 : 4;
 696                 u32 fmt : 4;
 697                 u32 : 16;
 698         } __attribute__ ((packed)) *secm_area;
 699         int ret, ccode;
 700
 701         spin_lock_irq(&chsc_page_lock);
 702         memset(chsc_page, 0, PAGE_SIZE);
 703         secm_area = chsc_page;
 704         secm_area->request.length = 0x0050;
 705         secm_area->request.code = 0x0016;
 706
 707         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 708         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 709         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 710
 711         secm_area->operation_code = enable ? 0 : 1;
 712
 713         ccode = chsc(secm_area);
 714         if (ccode > 0) {
 715                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 716                 goto out;
 717         }
 718
 719         switch (secm_area->response.code) {
 720         case 0x0102:
 721         case 0x0103:
 722                 ret = -EINVAL;
 723                 break;
 724         default:
 725                 ret = chsc_error_from_response(secm_area->response.code);
 726         }
 727         if (ret != 0)
 728                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 729                               secm_area->response.code);
 730 out:
 731         spin_unlock_irq(&chsc_page_lock);
 732         return ret;
 733 }
 734
 735 int
 736 chsc_secm(struct channel_subsystem *css, int enable)
 737 {
 738         int ret;
 739
 740         if (enable && !css->cm_enabled) {
 741                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 742                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 743                 if (!css->cub_addr1 || !css->cub_addr2) {
 744                         free_page((unsigned long)css->cub_addr1);
 745                         free_page((unsigned long)css->cub_addr2);
 746                         return -ENOMEM;
 747                 }
 748         }
 749         ret = __chsc_do_secm(css, enable);
 750         if (!ret) {
 751                 css->cm_enabled = enable;
 752                 if (css->cm_enabled) {
 753                         ret = chsc_add_cmg_attr(css);
 754                         if (ret) {
 755                                 __chsc_do_secm(css, 0);
 756                                 css->cm_enabled = 0;
 757                         }
 758                 } else
 759                         chsc_remove_cmg_attr(css);
 760         }
 761         if (!css->cm_enabled) {
 762                 free_page((unsigned long)css->cub_addr1);
 763                 free_page((unsigned long)css->cub_addr2);
 764         }
 765         return ret;
 766 }
 767
 768 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 769                                      int c, int m, void *page)
 770 {
 771         struct chsc_scpd *scpd_area;
 772         int ccode, ret;
 773
 774         if ((rfmt == 1) && !css_general_characteristics.fcs)
 775                 return -EINVAL;
 776         if ((rfmt == 2) && !css_general_characteristics.cib)
 777                 return -EINVAL;
 778
 779         memset(page, 0, PAGE_SIZE);
 780         scpd_area = page;
 781         scpd_area->request.length = 0x0010;
 782         scpd_area->request.code = 0x0002;
 783         scpd_area->cssid = chpid.cssid;
 784         scpd_area->first_chpid = chpid.id;
 785         scpd_area->last_chpid = chpid.id;
 786         scpd_area->m = m;
 787         scpd_area->c = c;
 788         scpd_area->fmt = fmt;
 789         scpd_area->rfmt = rfmt;
 790
 791         ccode = chsc(scpd_area);
 792         if (ccode > 0)
 793                 return (ccode == 3) ? -ENODEV : -EBUSY;
 794
 795         ret = chsc_error_from_response(scpd_area->response.code);
 796         if (ret)
 797                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 798                               scpd_area->response.code);
 799         return ret;
 800 }
 801 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 802
 803 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 804                                           struct channel_path_desc *desc)
 805 {
 806         struct chsc_response_struct *chsc_resp;
 807         struct chsc_scpd *scpd_area;
 808         unsigned long flags;
 809         int ret;
 810
 811         spin_lock_irqsave(&chsc_page_lock, flags);
 812         scpd_area = chsc_page;
 813         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 814         if (ret)
 815                 goto out;
 816         chsc_resp = (void *)&scpd_area->response;
 817         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 818 out:
 819         spin_unlock_irqrestore(&chsc_page_lock, flags);
 820         return ret;
 821 }
 822
 823 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 824                                           struct channel_path_desc_fmt1 *desc)
 825 {
 826         struct chsc_response_struct *chsc_resp;
 827         struct chsc_scpd *scpd_area;
 828         int ret;
 829
 830         spin_lock_irq(&chsc_page_lock);
 831         scpd_area = chsc_page;
 832         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
 833         if (ret)
 834                 goto out;
 835         chsc_resp = (void *)&scpd_area->response;
 836         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 837 out:
 838         spin_unlock_irq(&chsc_page_lock);
 839         return ret;
 840 }
 841
 842 static void
 843 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 844                           struct cmg_chars *chars)
 845 {
 846         struct cmg_chars *cmg_chars;
 847         int i, mask;
 848
 849         cmg_chars = chp->cmg_chars;
 850         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 851                 mask = 0x80 >> (i + 3);
 852                 if (cmcv & mask)
 853                         cmg_chars->values[i] = chars->values[i];
 854                 else
 855                         cmg_chars->values[i] = 0;
 856         }
 857 }
 858
 859 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 860 {
 861         struct cmg_chars *cmg_chars;
 862         int ccode, ret;
 863
 864         struct {
 865                 struct chsc_header request;
 866                 u32 : 24;
 867                 u32 first_chpid : 8;
 868                 u32 : 24;
 869                 u32 last_chpid : 8;
 870                 u32 zeroes1;
 871                 struct chsc_header response;
 872                 u32 zeroes2;
 873                 u32 not_valid : 1;
 874                 u32 shared : 1;
 875                 u32 : 22;
 876                 u32 chpid : 8;
 877                 u32 cmcv : 5;
 878                 u32 : 11;
 879                 u32 cmgq : 8;
 880                 u32 cmg : 8;
 881                 u32 zeroes3;
 882                 u32 data[NR_MEASUREMENT_CHARS];
 883         } __attribute__ ((packed)) *scmc_area;
 884
 885         chp->cmg_chars = NULL;
 886         cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
 887         if (!cmg_chars)
 888                 return -ENOMEM;
 889
 890         spin_lock_irq(&chsc_page_lock);
 891         memset(chsc_page, 0, PAGE_SIZE);
 892         scmc_area = chsc_page;
 893         scmc_area->request.length = 0x0010;
 894         scmc_area->request.code = 0x0022;
 895         scmc_area->first_chpid = chp->chpid.id;
 896         scmc_area->last_chpid = chp->chpid.id;
 897
 898         ccode = chsc(scmc_area);
 899         if (ccode > 0) {
 900                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 901                 goto out;
 902         }
 903
 904         ret = chsc_error_from_response(scmc_area->response.code);
 905         if (ret) {
 906                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 907                               scmc_area->response.code);
 908                 goto out;
 909         }
 910         if (scmc_area->not_valid) {
 911                 chp->cmg = -1;
 912                 chp->shared = -1;
 913                 goto out;
 914         }
 915         chp->cmg = scmc_area->cmg;
 916         chp->shared = scmc_area->shared;
 917         if (chp->cmg != 2 && chp->cmg != 3) {
 918                 /* No cmg-dependent data. */
 919                 goto out;
 920         }
 921         chp->cmg_chars = cmg_chars;
 922         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 923                                   (struct cmg_chars *) &scmc_area->data);
 924 out:
 925         spin_unlock_irq(&chsc_page_lock);
 926         if (!chp->cmg_chars)
 927                 kfree(cmg_chars);
 928
 929         return ret;
 930 }
 931
 932 int __init chsc_init(void)
 933 {
 934         int ret;
 935
 936         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 937         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 938         if (!sei_page || !chsc_page) {
 939                 ret = -ENOMEM;
 940                 goto out_err;
 941         }
 942         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
 943         if (ret)
 944                 goto out_err;
 945         return ret;
 946 out_err:
 947         free_page((unsigned long)chsc_page);
 948         free_page((unsigned long)sei_page);
 949         return ret;
 950 }
 951
 952 void __init chsc_init_cleanup(void)
 953 {
 954         crw_unregister_handler(CRW_RSC_CSS);
 955         free_page((unsigned long)chsc_page);
 956         free_page((unsigned long)sei_page);
 957 }
 958
 959 int chsc_enable_facility(int operation_code)
 960 {
 961         unsigned long flags;
 962         int ret;
 963         struct {
 964                 struct chsc_header request;
 965                 u8 reserved1:4;
 966                 u8 format:4;
 967                 u8 reserved2;
 968                 u16 operation_code;
 969                 u32 reserved3;
 970                 u32 reserved4;
 971                 u32 operation_data_area[252];
 972                 struct chsc_header response;
 973                 u32 reserved5:4;
 974                 u32 format2:4;
 975                 u32 reserved6:24;
 976         } __attribute__ ((packed)) *sda_area;
 977
 978         spin_lock_irqsave(&chsc_page_lock, flags);
 979         memset(chsc_page, 0, PAGE_SIZE);
 980         sda_area = chsc_page;
 981         sda_area->request.length = 0x0400;
 982         sda_area->request.code = 0x0031;
 983         sda_area->operation_code = operation_code;
 984
 985         ret = chsc(sda_area);
 986         if (ret > 0) {
 987                 ret = (ret == 3) ? -ENODEV : -EBUSY;
 988                 goto out;
 989         }
 990
 991         switch (sda_area->response.code) {
 992         case 0x0101:
 993                 ret = -EOPNOTSUPP;
 994                 break;
 995         default:
 996                 ret = chsc_error_from_response(sda_area->response.code);
 997         }
 998         if (ret != 0)
 999                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1000                               operation_code, sda_area->response.code);
1001 out:
1002         spin_unlock_irqrestore(&chsc_page_lock, flags);
1003         return ret;
1004 }
1005
1006 struct css_general_char css_general_characteristics;
1007 struct css_chsc_char css_chsc_characteristics;
1008
1009 int __init
1010 chsc_determine_css_characteristics(void)
1011 {
1012         int result;
1013         struct {
1014                 struct chsc_header request;
1015                 u32 reserved1;
1016                 u32 reserved2;
1017                 u32 reserved3;
1018                 struct chsc_header response;
1019                 u32 reserved4;
1020                 u32 general_char[510];
1021                 u32 chsc_char[508];
1022         } __attribute__ ((packed)) *scsc_area;
1023
1024         spin_lock_irq(&chsc_page_lock);
1025         memset(chsc_page, 0, PAGE_SIZE);
1026         scsc_area = chsc_page;
1027         scsc_area->request.length = 0x0010;
1028         scsc_area->request.code = 0x0010;
1029
1030         result = chsc(scsc_area);
1031         if (result) {
1032                 result = (result == 3) ? -ENODEV : -EBUSY;
1033                 goto exit;
1034         }
1035
1036         result = chsc_error_from_response(scsc_area->response.code);
1037         if (result == 0) {
1038                 memcpy(&css_general_characteristics, scsc_area->general_char,
1039                        sizeof(css_general_characteristics));
1040                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1041                        sizeof(css_chsc_characteristics));
1042         } else
1043                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1044                               scsc_area->response.code);
1045 exit:
1046         spin_unlock_irq(&chsc_page_lock);
1047         return result;
1048 }
1049
1050 EXPORT_SYMBOL_GPL(css_general_characteristics);
1051 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1052
1053 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
1054 {
1055         struct {
1056                 struct chsc_header request;
1057                 unsigned int rsvd0;
1058                 unsigned int op : 8;
1059                 unsigned int rsvd1 : 8;
1060                 unsigned int ctrl : 16;
1061                 unsigned int rsvd2[5];
1062                 struct chsc_header response;
1063                 unsigned int rsvd3[7];
1064         } __attribute__ ((packed)) *rr;
1065         int rc;
1066
1067         memset(page, 0, PAGE_SIZE);
1068         rr = page;
1069         rr->request.length = 0x0020;
1070         rr->request.code = 0x0033;
1071         rr->op = op;
1072         rr->ctrl = ctrl;
1073         rc = chsc(rr);
1074         if (rc)
1075                 return -EIO;
1076         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1077         return rc;
1078 }
1079
1080 int chsc_sstpi(void *page, void *result, size_t size)
1081 {
1082         struct {
1083                 struct chsc_header request;
1084                 unsigned int rsvd0[3];
1085                 struct chsc_header response;
1086                 char data[size];
1087         } __attribute__ ((packed)) *rr;
1088         int rc;
1089
1090         memset(page, 0, PAGE_SIZE);
1091         rr = page;
1092         rr->request.length = 0x0010;
1093         rr->request.code = 0x0038;
1094         rc = chsc(rr);
1095         if (rc)
1096                 return -EIO;
1097         memcpy(result, &rr->data, size);
1098         return (rr->response.code == 0x0001) ? 0 : -EIO;
1099 }
1100
1101 int chsc_siosl(struct subchannel_id schid)
1102 {
1103         struct {
1104                 struct chsc_header request;
1105                 u32 word1;
1106                 struct subchannel_id sid;
1107                 u32 word3;
1108                 struct chsc_header response;
1109                 u32 word[11];
1110         } __attribute__ ((packed)) *siosl_area;
1111         unsigned long flags;
1112         int ccode;
1113         int rc;
1114
1115         spin_lock_irqsave(&chsc_page_lock, flags);
1116         memset(chsc_page, 0, PAGE_SIZE);
1117         siosl_area = chsc_page;
1118         siosl_area->request.length = 0x0010;
1119         siosl_area->request.code = 0x0046;
1120         siosl_area->word1 = 0x80000000;
1121         siosl_area->sid = schid;
1122
1123         ccode = chsc(siosl_area);
1124         if (ccode > 0) {
1125                 if (ccode == 3)
1126                         rc = -ENODEV;
1127                 else
1128                         rc = -EBUSY;
1129                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1130                               schid.ssid, schid.sch_no, ccode);
1131                 goto out;
1132         }
1133         rc = chsc_error_from_response(siosl_area->response.code);
1134         if (rc)
1135                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1136                               schid.ssid, schid.sch_no,
1137                               siosl_area->response.code);
1138         else
1139                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1140                               schid.ssid, schid.sch_no);
1141 out:
1142         spin_unlock_irqrestore(&chsc_page_lock, flags);
1143         return rc;
1144 }
1145 EXPORT_SYMBOL_GPL(chsc_siosl);
1146
1147 /**
1148  * chsc_scm_info() - store SCM information (SSI)
1149  * @scm_area: request and response block for SSI
1150  * @token: continuation token
1151  *
1152  * Returns 0 on success.
1153  */
1154 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1155 {
1156         int ccode, ret;
1157
1158         memset(scm_area, 0, sizeof(*scm_area));
1159         scm_area->request.length = 0x0020;
1160         scm_area->request.code = 0x004C;
1161         scm_area->reqtok = token;
1162
1163         ccode = chsc(scm_area);
1164         if (ccode > 0) {
1165                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1166                 goto out;
1167         }
1168         ret = chsc_error_from_response(scm_area->response.code);
1169         if (ret != 0)
1170                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1171                               scm_area->response.code);
1172 out:
1173         return ret;
1174 }
1175 EXPORT_SYMBOL_GPL(chsc_scm_info);