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_nt2(struct chsc_sei_nt2_area *sei_area)
 437 {
 438 #ifdef CONFIG_PCI
 439         switch (sei_area->cc) {
 440         case 1:
 441                 zpci_event_error(sei_area->ccdf);
 442                 break;
 443         case 2:
 444                 zpci_event_availability(sei_area->ccdf);
 445                 break;
 446         default:
 447                 CIO_CRW_EVENT(2, "chsc: unhandled sei content code %d\n",
 448                               sei_area->cc);
 449                 break;
 450         }
 451 #endif
 452 }
 453
 454 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 455 {
 456         /* which kind of information was stored? */
 457         switch (sei_area->cc) {
 458         case 1: /* link incident*/
 459                 chsc_process_sei_link_incident(sei_area);
 460                 break;
 461         case 2: /* i/o resource accessibility */
 462                 chsc_process_sei_res_acc(sei_area);
 463                 break;
 464         case 7: /* channel-path-availability information */
 465                 chsc_process_sei_chp_avail(sei_area);
 466                 break;
 467         case 8: /* channel-path-configuration notification */
 468                 chsc_process_sei_chp_config(sei_area);
 469                 break;
 470         case 12: /* scm change notification */
 471                 chsc_process_sei_scm_change(sei_area);
 472                 break;
 473         default: /* other stuff */
 474                 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
 475                               sei_area->cc);
 476                 break;
 477         }
 478 }
 479
 480 static int __chsc_process_crw(struct chsc_sei *sei, u64 ntsm)
 481 {
 482         do {
 483                 memset(sei, 0, sizeof(*sei));
 484                 sei->request.length = 0x0010;
 485                 sei->request.code = 0x000e;
 486                 sei->ntsm = ntsm;
 487
 488                 if (chsc(sei))
 489                         break;
 490
 491                 if (sei->response.code == 0x0001) {
 492                         CIO_CRW_EVENT(2, "chsc: sei successful\n");
 493
 494                         /* Check if we might have lost some information. */
 495                         if (sei->u.nt0_area.flags & 0x40) {
 496                                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 497                                 css_schedule_eval_all();
 498                         }
 499
 500                         switch (sei->nt) {
 501                         case 0:
 502                                 chsc_process_sei_nt0(&sei->u.nt0_area);
 503                                 break;
 504                         case 2:
 505                                 chsc_process_sei_nt2(&sei->u.nt2_area);
 506                                 break;
 507                         default:
 508                                 CIO_CRW_EVENT(2, "chsc: unhandled nt=%d\n",
 509                                               sei->nt);
 510                                 break;
 511                         }
 512                 } else {
 513                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 514                                       sei->response.code);
 515                         break;
 516                 }
 517         } while (sei->u.nt0_area.flags & 0x80);
 518
 519         return 0;
 520 }
 521
 522 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 523 {
 524         struct chsc_sei *sei;
 525
 526         if (overflow) {
 527                 css_schedule_eval_all();
 528                 return;
 529         }
 530         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 531                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 532                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 533                       crw0->erc, crw0->rsid);
 534         if (!sei_page)
 535                 return;
 536         /* Access to sei_page is serialized through machine check handler
 537          * thread, so no need for locking. */
 538         sei = sei_page;
 539
 540         CIO_TRACE_EVENT(2, "prcss");
 541         __chsc_process_crw(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 542 }
 543
 544 void chsc_chp_online(struct chp_id chpid)
 545 {
 546         char dbf_txt[15];
 547         struct chp_link link;
 548
 549         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 550         CIO_TRACE_EVENT(2, dbf_txt);
 551
 552         if (chp_get_status(chpid) != 0) {
 553                 memset(&link, 0, sizeof(struct chp_link));
 554                 link.chpid = chpid;
 555                 /* Wait until previous actions have settled. */
 556                 css_wait_for_slow_path();
 557                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 558                                            &link);
 559         }
 560 }
 561
 562 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 563                                          struct chp_id chpid, int on)
 564 {
 565         unsigned long flags;
 566         struct chp_link link;
 567
 568         memset(&link, 0, sizeof(struct chp_link));
 569         link.chpid = chpid;
 570         spin_lock_irqsave(sch->lock, flags);
 571         if (sch->driver && sch->driver->chp_event)
 572                 sch->driver->chp_event(sch, &link,
 573                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 574         spin_unlock_irqrestore(sch->lock, flags);
 575 }
 576
 577 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 578 {
 579         struct chp_id *chpid = data;
 580
 581         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 582         return 0;
 583 }
 584
 585 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 586 {
 587         struct chp_id *chpid = data;
 588
 589         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 590         return 0;
 591 }
 592
 593 static int
 594 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 595 {
 596         struct schib schib;
 597
 598         if (stsch_err(schid, &schib))
 599                 /* We're through */
 600                 return -ENXIO;
 601         /* Put it on the slow path. */
 602         css_schedule_eval(schid);
 603         return 0;
 604 }
 605
 606 /**
 607  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 608  * @chpid: channl-path ID
 609  * @on: non-zero for vary online, zero for vary offline
 610  */
 611 int chsc_chp_vary(struct chp_id chpid, int on)
 612 {
 613         struct channel_path *chp = chpid_to_chp(chpid);
 614
 615         /* Wait until previous actions have settled. */
 616         css_wait_for_slow_path();
 617         /*
 618          * Redo PathVerification on the devices the chpid connects to
 619          */
 620         if (on) {
 621                 /* Try to update the channel path descritor. */
 622                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 623                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 624                                            __s390_vary_chpid_on, &chpid);
 625         } else
 626                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 627                                            NULL, &chpid);
 628
 629         return 0;
 630 }
 631
 632 static void
 633 chsc_remove_cmg_attr(struct channel_subsystem *css)
 634 {
 635         int i;
 636
 637         for (i = 0; i <= __MAX_CHPID; i++) {
 638                 if (!css->chps[i])
 639                         continue;
 640                 chp_remove_cmg_attr(css->chps[i]);
 641         }
 642 }
 643
 644 static int
 645 chsc_add_cmg_attr(struct channel_subsystem *css)
 646 {
 647         int i, ret;
 648
 649         ret = 0;
 650         for (i = 0; i <= __MAX_CHPID; i++) {
 651                 if (!css->chps[i])
 652                         continue;
 653                 ret = chp_add_cmg_attr(css->chps[i]);
 654                 if (ret)
 655                         goto cleanup;
 656         }
 657         return ret;
 658 cleanup:
 659         for (--i; i >= 0; i--) {
 660                 if (!css->chps[i])
 661                         continue;
 662                 chp_remove_cmg_attr(css->chps[i]);
 663         }
 664         return ret;
 665 }
 666
 667 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 668 {
 669         struct {
 670                 struct chsc_header request;
 671                 u32 operation_code : 2;
 672                 u32 : 30;
 673                 u32 key : 4;
 674                 u32 : 28;
 675                 u32 zeroes1;
 676                 u32 cub_addr1;
 677                 u32 zeroes2;
 678                 u32 cub_addr2;
 679                 u32 reserved[13];
 680                 struct chsc_header response;
 681                 u32 status : 8;
 682                 u32 : 4;
 683                 u32 fmt : 4;
 684                 u32 : 16;
 685         } __attribute__ ((packed)) *secm_area;
 686         int ret, ccode;
 687
 688         spin_lock_irq(&chsc_page_lock);
 689         memset(chsc_page, 0, PAGE_SIZE);
 690         secm_area = chsc_page;
 691         secm_area->request.length = 0x0050;
 692         secm_area->request.code = 0x0016;
 693
 694         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 695         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 696         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 697
 698         secm_area->operation_code = enable ? 0 : 1;
 699
 700         ccode = chsc(secm_area);
 701         if (ccode > 0) {
 702                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 703                 goto out;
 704         }
 705
 706         switch (secm_area->response.code) {
 707         case 0x0102:
 708         case 0x0103:
 709                 ret = -EINVAL;
 710                 break;
 711         default:
 712                 ret = chsc_error_from_response(secm_area->response.code);
 713         }
 714         if (ret != 0)
 715                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 716                               secm_area->response.code);
 717 out:
 718         spin_unlock_irq(&chsc_page_lock);
 719         return ret;
 720 }
 721
 722 int
 723 chsc_secm(struct channel_subsystem *css, int enable)
 724 {
 725         int ret;
 726
 727         if (enable && !css->cm_enabled) {
 728                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 729                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 730                 if (!css->cub_addr1 || !css->cub_addr2) {
 731                         free_page((unsigned long)css->cub_addr1);
 732                         free_page((unsigned long)css->cub_addr2);
 733                         return -ENOMEM;
 734                 }
 735         }
 736         ret = __chsc_do_secm(css, enable);
 737         if (!ret) {
 738                 css->cm_enabled = enable;
 739                 if (css->cm_enabled) {
 740                         ret = chsc_add_cmg_attr(css);
 741                         if (ret) {
 742                                 __chsc_do_secm(css, 0);
 743                                 css->cm_enabled = 0;
 744                         }
 745                 } else
 746                         chsc_remove_cmg_attr(css);
 747         }
 748         if (!css->cm_enabled) {
 749                 free_page((unsigned long)css->cub_addr1);
 750                 free_page((unsigned long)css->cub_addr2);
 751         }
 752         return ret;
 753 }
 754
 755 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 756                                      int c, int m, void *page)
 757 {
 758         struct chsc_scpd *scpd_area;
 759         int ccode, ret;
 760
 761         if ((rfmt == 1) && !css_general_characteristics.fcs)
 762                 return -EINVAL;
 763         if ((rfmt == 2) && !css_general_characteristics.cib)
 764                 return -EINVAL;
 765
 766         memset(page, 0, PAGE_SIZE);
 767         scpd_area = page;
 768         scpd_area->request.length = 0x0010;
 769         scpd_area->request.code = 0x0002;
 770         scpd_area->cssid = chpid.cssid;
 771         scpd_area->first_chpid = chpid.id;
 772         scpd_area->last_chpid = chpid.id;
 773         scpd_area->m = m;
 774         scpd_area->c = c;
 775         scpd_area->fmt = fmt;
 776         scpd_area->rfmt = rfmt;
 777
 778         ccode = chsc(scpd_area);
 779         if (ccode > 0)
 780                 return (ccode == 3) ? -ENODEV : -EBUSY;
 781
 782         ret = chsc_error_from_response(scpd_area->response.code);
 783         if (ret)
 784                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 785                               scpd_area->response.code);
 786         return ret;
 787 }
 788 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 789
 790 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 791                                           struct channel_path_desc *desc)
 792 {
 793         struct chsc_response_struct *chsc_resp;
 794         struct chsc_scpd *scpd_area;
 795         unsigned long flags;
 796         int ret;
 797
 798         spin_lock_irqsave(&chsc_page_lock, flags);
 799         scpd_area = chsc_page;
 800         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 801         if (ret)
 802                 goto out;
 803         chsc_resp = (void *)&scpd_area->response;
 804         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 805 out:
 806         spin_unlock_irqrestore(&chsc_page_lock, flags);
 807         return ret;
 808 }
 809
 810 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 811                                           struct channel_path_desc_fmt1 *desc)
 812 {
 813         struct chsc_response_struct *chsc_resp;
 814         struct chsc_scpd *scpd_area;
 815         int ret;
 816
 817         spin_lock_irq(&chsc_page_lock);
 818         scpd_area = chsc_page;
 819         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
 820         if (ret)
 821                 goto out;
 822         chsc_resp = (void *)&scpd_area->response;
 823         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 824 out:
 825         spin_unlock_irq(&chsc_page_lock);
 826         return ret;
 827 }
 828
 829 static void
 830 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 831                           struct cmg_chars *chars)
 832 {
 833         struct cmg_chars *cmg_chars;
 834         int i, mask;
 835
 836         cmg_chars = chp->cmg_chars;
 837         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 838                 mask = 0x80 >> (i + 3);
 839                 if (cmcv & mask)
 840                         cmg_chars->values[i] = chars->values[i];
 841                 else
 842                         cmg_chars->values[i] = 0;
 843         }
 844 }
 845
 846 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 847 {
 848         struct cmg_chars *cmg_chars;
 849         int ccode, ret;
 850
 851         struct {
 852                 struct chsc_header request;
 853                 u32 : 24;
 854                 u32 first_chpid : 8;
 855                 u32 : 24;
 856                 u32 last_chpid : 8;
 857                 u32 zeroes1;
 858                 struct chsc_header response;
 859                 u32 zeroes2;
 860                 u32 not_valid : 1;
 861                 u32 shared : 1;
 862                 u32 : 22;
 863                 u32 chpid : 8;
 864                 u32 cmcv : 5;
 865                 u32 : 11;
 866                 u32 cmgq : 8;
 867                 u32 cmg : 8;
 868                 u32 zeroes3;
 869                 u32 data[NR_MEASUREMENT_CHARS];
 870         } __attribute__ ((packed)) *scmc_area;
 871
 872         chp->cmg_chars = NULL;
 873         cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
 874         if (!cmg_chars)
 875                 return -ENOMEM;
 876
 877         spin_lock_irq(&chsc_page_lock);
 878         memset(chsc_page, 0, PAGE_SIZE);
 879         scmc_area = chsc_page;
 880         scmc_area->request.length = 0x0010;
 881         scmc_area->request.code = 0x0022;
 882         scmc_area->first_chpid = chp->chpid.id;
 883         scmc_area->last_chpid = chp->chpid.id;
 884
 885         ccode = chsc(scmc_area);
 886         if (ccode > 0) {
 887                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 888                 goto out;
 889         }
 890
 891         ret = chsc_error_from_response(scmc_area->response.code);
 892         if (ret) {
 893                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 894                               scmc_area->response.code);
 895                 goto out;
 896         }
 897         if (scmc_area->not_valid) {
 898                 chp->cmg = -1;
 899                 chp->shared = -1;
 900                 goto out;
 901         }
 902         chp->cmg = scmc_area->cmg;
 903         chp->shared = scmc_area->shared;
 904         if (chp->cmg != 2 && chp->cmg != 3) {
 905                 /* No cmg-dependent data. */
 906                 goto out;
 907         }
 908         chp->cmg_chars = cmg_chars;
 909         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 910                                   (struct cmg_chars *) &scmc_area->data);
 911 out:
 912         spin_unlock_irq(&chsc_page_lock);
 913         if (!chp->cmg_chars)
 914                 kfree(cmg_chars);
 915
 916         return ret;
 917 }
 918
 919 int __init chsc_init(void)
 920 {
 921         int ret;
 922
 923         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 924         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 925         if (!sei_page || !chsc_page) {
 926                 ret = -ENOMEM;
 927                 goto out_err;
 928         }
 929         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
 930         if (ret)
 931                 goto out_err;
 932         return ret;
 933 out_err:
 934         free_page((unsigned long)chsc_page);
 935         free_page((unsigned long)sei_page);
 936         return ret;
 937 }
 938
 939 void __init chsc_init_cleanup(void)
 940 {
 941         crw_unregister_handler(CRW_RSC_CSS);
 942         free_page((unsigned long)chsc_page);
 943         free_page((unsigned long)sei_page);
 944 }
 945
 946 int chsc_enable_facility(int operation_code)
 947 {
 948         unsigned long flags;
 949         int ret;
 950         struct {
 951                 struct chsc_header request;
 952                 u8 reserved1:4;
 953                 u8 format:4;
 954                 u8 reserved2;
 955                 u16 operation_code;
 956                 u32 reserved3;
 957                 u32 reserved4;
 958                 u32 operation_data_area[252];
 959                 struct chsc_header response;
 960                 u32 reserved5:4;
 961                 u32 format2:4;
 962                 u32 reserved6:24;
 963         } __attribute__ ((packed)) *sda_area;
 964
 965         spin_lock_irqsave(&chsc_page_lock, flags);
 966         memset(chsc_page, 0, PAGE_SIZE);
 967         sda_area = chsc_page;
 968         sda_area->request.length = 0x0400;
 969         sda_area->request.code = 0x0031;
 970         sda_area->operation_code = operation_code;
 971
 972         ret = chsc(sda_area);
 973         if (ret > 0) {
 974                 ret = (ret == 3) ? -ENODEV : -EBUSY;
 975                 goto out;
 976         }
 977
 978         switch (sda_area->response.code) {
 979         case 0x0101:
 980                 ret = -EOPNOTSUPP;
 981                 break;
 982         default:
 983                 ret = chsc_error_from_response(sda_area->response.code);
 984         }
 985         if (ret != 0)
 986                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
 987                               operation_code, sda_area->response.code);
 988 out:
 989         spin_unlock_irqrestore(&chsc_page_lock, flags);
 990         return ret;
 991 }
 992
 993 struct css_general_char css_general_characteristics;
 994 struct css_chsc_char css_chsc_characteristics;
 995
 996 int __init
 997 chsc_determine_css_characteristics(void)
 998 {
 999         int result;
1000         struct {
1001                 struct chsc_header request;
1002                 u32 reserved1;
1003                 u32 reserved2;
1004                 u32 reserved3;
1005                 struct chsc_header response;
1006                 u32 reserved4;
1007                 u32 general_char[510];
1008                 u32 chsc_char[508];
1009         } __attribute__ ((packed)) *scsc_area;
1010
1011         spin_lock_irq(&chsc_page_lock);
1012         memset(chsc_page, 0, PAGE_SIZE);
1013         scsc_area = chsc_page;
1014         scsc_area->request.length = 0x0010;
1015         scsc_area->request.code = 0x0010;
1016
1017         result = chsc(scsc_area);
1018         if (result) {
1019                 result = (result == 3) ? -ENODEV : -EBUSY;
1020                 goto exit;
1021         }
1022
1023         result = chsc_error_from_response(scsc_area->response.code);
1024         if (result == 0) {
1025                 memcpy(&css_general_characteristics, scsc_area->general_char,
1026                        sizeof(css_general_characteristics));
1027                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1028                        sizeof(css_chsc_characteristics));
1029         } else
1030                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1031                               scsc_area->response.code);
1032 exit:
1033         spin_unlock_irq(&chsc_page_lock);
1034         return result;
1035 }
1036
1037 EXPORT_SYMBOL_GPL(css_general_characteristics);
1038 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1039
1040 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
1041 {
1042         struct {
1043                 struct chsc_header request;
1044                 unsigned int rsvd0;
1045                 unsigned int op : 8;
1046                 unsigned int rsvd1 : 8;
1047                 unsigned int ctrl : 16;
1048                 unsigned int rsvd2[5];
1049                 struct chsc_header response;
1050                 unsigned int rsvd3[7];
1051         } __attribute__ ((packed)) *rr;
1052         int rc;
1053
1054         memset(page, 0, PAGE_SIZE);
1055         rr = page;
1056         rr->request.length = 0x0020;
1057         rr->request.code = 0x0033;
1058         rr->op = op;
1059         rr->ctrl = ctrl;
1060         rc = chsc(rr);
1061         if (rc)
1062                 return -EIO;
1063         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1064         return rc;
1065 }
1066
1067 int chsc_sstpi(void *page, void *result, size_t size)
1068 {
1069         struct {
1070                 struct chsc_header request;
1071                 unsigned int rsvd0[3];
1072                 struct chsc_header response;
1073                 char data[size];
1074         } __attribute__ ((packed)) *rr;
1075         int rc;
1076
1077         memset(page, 0, PAGE_SIZE);
1078         rr = page;
1079         rr->request.length = 0x0010;
1080         rr->request.code = 0x0038;
1081         rc = chsc(rr);
1082         if (rc)
1083                 return -EIO;
1084         memcpy(result, &rr->data, size);
1085         return (rr->response.code == 0x0001) ? 0 : -EIO;
1086 }
1087
1088 int chsc_siosl(struct subchannel_id schid)
1089 {
1090         struct {
1091                 struct chsc_header request;
1092                 u32 word1;
1093                 struct subchannel_id sid;
1094                 u32 word3;
1095                 struct chsc_header response;
1096                 u32 word[11];
1097         } __attribute__ ((packed)) *siosl_area;
1098         unsigned long flags;
1099         int ccode;
1100         int rc;
1101
1102         spin_lock_irqsave(&chsc_page_lock, flags);
1103         memset(chsc_page, 0, PAGE_SIZE);
1104         siosl_area = chsc_page;
1105         siosl_area->request.length = 0x0010;
1106         siosl_area->request.code = 0x0046;
1107         siosl_area->word1 = 0x80000000;
1108         siosl_area->sid = schid;
1109
1110         ccode = chsc(siosl_area);
1111         if (ccode > 0) {
1112                 if (ccode == 3)
1113                         rc = -ENODEV;
1114                 else
1115                         rc = -EBUSY;
1116                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1117                               schid.ssid, schid.sch_no, ccode);
1118                 goto out;
1119         }
1120         rc = chsc_error_from_response(siosl_area->response.code);
1121         if (rc)
1122                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1123                               schid.ssid, schid.sch_no,
1124                               siosl_area->response.code);
1125         else
1126                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1127                               schid.ssid, schid.sch_no);
1128 out:
1129         spin_unlock_irqrestore(&chsc_page_lock, flags);
1130         return rc;
1131 }
1132 EXPORT_SYMBOL_GPL(chsc_siosl);
1133
1134 /**
1135  * chsc_scm_info() - store SCM information (SSI)
1136  * @scm_area: request and response block for SSI
1137  * @token: continuation token
1138  *
1139  * Returns 0 on success.
1140  */
1141 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1142 {
1143         int ccode, ret;
1144
1145         memset(scm_area, 0, sizeof(*scm_area));
1146         scm_area->request.length = 0x0020;
1147         scm_area->request.code = 0x004C;
1148         scm_area->reqtok = token;
1149
1150         ccode = chsc(scm_area);
1151         if (ccode > 0) {
1152                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1153                 goto out;
1154         }
1155         ret = chsc_error_from_response(scm_area->response.code);
1156         if (ret != 0)
1157                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1158                               scm_area->response.code);
1159 out:
1160         return ret;
1161 }
1162 EXPORT_SYMBOL_GPL(chsc_scm_info);