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         switch (sei_area->cc) {
 439         case 1:
 440                 zpci_event_error(sei_area->ccdf);
 441                 break;
 442         case 2:
 443                 zpci_event_availability(sei_area->ccdf);
 444                 break;
 445         default:
 446                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 447                               sei_area->cc);
 448                 break;
 449         }
 450 }
 451
 452 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 453 {
 454         /* which kind of information was stored? */
 455         switch (sei_area->cc) {
 456         case 1: /* link incident*/
 457                 chsc_process_sei_link_incident(sei_area);
 458                 break;
 459         case 2: /* i/o resource accessibility */
 460                 chsc_process_sei_res_acc(sei_area);
 461                 break;
 462         case 7: /* channel-path-availability information */
 463                 chsc_process_sei_chp_avail(sei_area);
 464                 break;
 465         case 8: /* channel-path-configuration notification */
 466                 chsc_process_sei_chp_config(sei_area);
 467                 break;
 468         case 12: /* scm change notification */
 469                 chsc_process_sei_scm_change(sei_area);
 470                 break;
 471         default: /* other stuff */
 472                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 473                               sei_area->cc);
 474                 break;
 475         }
 476
 477         /* Check if we might have lost some information. */
 478         if (sei_area->flags & 0x40) {
 479                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 480                 css_schedule_eval_all();
 481         }
 482 }
 483
 484 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 485 {
 486         do {
 487                 memset(sei, 0, sizeof(*sei));
 488                 sei->request.length = 0x0010;
 489                 sei->request.code = 0x000e;
 490                 sei->ntsm = ntsm;
 491
 492                 if (chsc(sei))
 493                         break;
 494
 495                 if (sei->response.code != 0x0001) {
 496                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 497                                       sei->response.code);
 498                         break;
 499                 }
 500
 501                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 502                 switch (sei->nt) {
 503                 case 0:
 504                         chsc_process_sei_nt0(&sei->u.nt0_area);
 505                         break;
 506                 case 2:
 507                         chsc_process_sei_nt2(&sei->u.nt2_area);
 508                         break;
 509                 default:
 510                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 511                         break;
 512                 }
 513         } while (sei->u.nt0_area.flags & 0x80);
 514 }
 515
 516 /*
 517  * Handle channel subsystem related CRWs.
 518  * Use store event information to find out what's going on.
 519  *
 520  * Note: Access to sei_page is serialized through machine check handler
 521  * thread, so no need for locking.
 522  */
 523 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 524 {
 525         struct chsc_sei *sei = sei_page;
 526
 527         if (overflow) {
 528                 css_schedule_eval_all();
 529                 return;
 530         }
 531         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 532                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 533                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 534                       crw0->erc, crw0->rsid);
 535
 536         CIO_TRACE_EVENT(2, "prcss");
 537         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 538 }
 539
 540 void chsc_chp_online(struct chp_id chpid)
 541 {
 542         char dbf_txt[15];
 543         struct chp_link link;
 544
 545         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 546         CIO_TRACE_EVENT(2, dbf_txt);
 547
 548         if (chp_get_status(chpid) != 0) {
 549                 memset(&link, 0, sizeof(struct chp_link));
 550                 link.chpid = chpid;
 551                 /* Wait until previous actions have settled. */
 552                 css_wait_for_slow_path();
 553                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 554                                            &link);
 555         }
 556 }
 557
 558 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 559                                          struct chp_id chpid, int on)
 560 {
 561         unsigned long flags;
 562         struct chp_link link;
 563
 564         memset(&link, 0, sizeof(struct chp_link));
 565         link.chpid = chpid;
 566         spin_lock_irqsave(sch->lock, flags);
 567         if (sch->driver && sch->driver->chp_event)
 568                 sch->driver->chp_event(sch, &link,
 569                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 570         spin_unlock_irqrestore(sch->lock, flags);
 571 }
 572
 573 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 574 {
 575         struct chp_id *chpid = data;
 576
 577         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 578         return 0;
 579 }
 580
 581 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 582 {
 583         struct chp_id *chpid = data;
 584
 585         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 586         return 0;
 587 }
 588
 589 static int
 590 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 591 {
 592         struct schib schib;
 593
 594         if (stsch_err(schid, &schib))
 595                 /* We're through */
 596                 return -ENXIO;
 597         /* Put it on the slow path. */
 598         css_schedule_eval(schid);
 599         return 0;
 600 }
 601
 602 /**
 603  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 604  * @chpid: channl-path ID
 605  * @on: non-zero for vary online, zero for vary offline
 606  */
 607 int chsc_chp_vary(struct chp_id chpid, int on)
 608 {
 609         struct channel_path *chp = chpid_to_chp(chpid);
 610
 611         /* Wait until previous actions have settled. */
 612         css_wait_for_slow_path();
 613         /*
 614          * Redo PathVerification on the devices the chpid connects to
 615          */
 616         if (on) {
 617                 /* Try to update the channel path descritor. */
 618                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 619                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 620                                            __s390_vary_chpid_on, &chpid);
 621         } else
 622                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 623                                            NULL, &chpid);
 624
 625         return 0;
 626 }
 627
 628 static void
 629 chsc_remove_cmg_attr(struct channel_subsystem *css)
 630 {
 631         int i;
 632
 633         for (i = 0; i <= __MAX_CHPID; i++) {
 634                 if (!css->chps[i])
 635                         continue;
 636                 chp_remove_cmg_attr(css->chps[i]);
 637         }
 638 }
 639
 640 static int
 641 chsc_add_cmg_attr(struct channel_subsystem *css)
 642 {
 643         int i, ret;
 644
 645         ret = 0;
 646         for (i = 0; i <= __MAX_CHPID; i++) {
 647                 if (!css->chps[i])
 648                         continue;
 649                 ret = chp_add_cmg_attr(css->chps[i]);
 650                 if (ret)
 651                         goto cleanup;
 652         }
 653         return ret;
 654 cleanup:
 655         for (--i; i >= 0; i--) {
 656                 if (!css->chps[i])
 657                         continue;
 658                 chp_remove_cmg_attr(css->chps[i]);
 659         }
 660         return ret;
 661 }
 662
 663 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 664 {
 665         struct {
 666                 struct chsc_header request;
 667                 u32 operation_code : 2;
 668                 u32 : 30;
 669                 u32 key : 4;
 670                 u32 : 28;
 671                 u32 zeroes1;
 672                 u32 cub_addr1;
 673                 u32 zeroes2;
 674                 u32 cub_addr2;
 675                 u32 reserved[13];
 676                 struct chsc_header response;
 677                 u32 status : 8;
 678                 u32 : 4;
 679                 u32 fmt : 4;
 680                 u32 : 16;
 681         } __attribute__ ((packed)) *secm_area;
 682         int ret, ccode;
 683
 684         spin_lock_irq(&chsc_page_lock);
 685         memset(chsc_page, 0, PAGE_SIZE);
 686         secm_area = chsc_page;
 687         secm_area->request.length = 0x0050;
 688         secm_area->request.code = 0x0016;
 689
 690         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 691         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 692         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 693
 694         secm_area->operation_code = enable ? 0 : 1;
 695
 696         ccode = chsc(secm_area);
 697         if (ccode > 0) {
 698                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 699                 goto out;
 700         }
 701
 702         switch (secm_area->response.code) {
 703         case 0x0102:
 704         case 0x0103:
 705                 ret = -EINVAL;
 706                 break;
 707         default:
 708                 ret = chsc_error_from_response(secm_area->response.code);
 709         }
 710         if (ret != 0)
 711                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 712                               secm_area->response.code);
 713 out:
 714         spin_unlock_irq(&chsc_page_lock);
 715         return ret;
 716 }
 717
 718 int
 719 chsc_secm(struct channel_subsystem *css, int enable)
 720 {
 721         int ret;
 722
 723         if (enable && !css->cm_enabled) {
 724                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 725                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 726                 if (!css->cub_addr1 || !css->cub_addr2) {
 727                         free_page((unsigned long)css->cub_addr1);
 728                         free_page((unsigned long)css->cub_addr2);
 729                         return -ENOMEM;
 730                 }
 731         }
 732         ret = __chsc_do_secm(css, enable);
 733         if (!ret) {
 734                 css->cm_enabled = enable;
 735                 if (css->cm_enabled) {
 736                         ret = chsc_add_cmg_attr(css);
 737                         if (ret) {
 738                                 __chsc_do_secm(css, 0);
 739                                 css->cm_enabled = 0;
 740                         }
 741                 } else
 742                         chsc_remove_cmg_attr(css);
 743         }
 744         if (!css->cm_enabled) {
 745                 free_page((unsigned long)css->cub_addr1);
 746                 free_page((unsigned long)css->cub_addr2);
 747         }
 748         return ret;
 749 }
 750
 751 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 752                                      int c, int m, void *page)
 753 {
 754         struct chsc_scpd *scpd_area;
 755         int ccode, ret;
 756
 757         if ((rfmt == 1) && !css_general_characteristics.fcs)
 758                 return -EINVAL;
 759         if ((rfmt == 2) && !css_general_characteristics.cib)
 760                 return -EINVAL;
 761
 762         memset(page, 0, PAGE_SIZE);
 763         scpd_area = page;
 764         scpd_area->request.length = 0x0010;
 765         scpd_area->request.code = 0x0002;
 766         scpd_area->cssid = chpid.cssid;
 767         scpd_area->first_chpid = chpid.id;
 768         scpd_area->last_chpid = chpid.id;
 769         scpd_area->m = m;
 770         scpd_area->c = c;
 771         scpd_area->fmt = fmt;
 772         scpd_area->rfmt = rfmt;
 773
 774         ccode = chsc(scpd_area);
 775         if (ccode > 0)
 776                 return (ccode == 3) ? -ENODEV : -EBUSY;
 777
 778         ret = chsc_error_from_response(scpd_area->response.code);
 779         if (ret)
 780                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 781                               scpd_area->response.code);
 782         return ret;
 783 }
 784 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 785
 786 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 787                                           struct channel_path_desc *desc)
 788 {
 789         struct chsc_response_struct *chsc_resp;
 790         struct chsc_scpd *scpd_area;
 791         unsigned long flags;
 792         int ret;
 793
 794         spin_lock_irqsave(&chsc_page_lock, flags);
 795         scpd_area = chsc_page;
 796         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 797         if (ret)
 798                 goto out;
 799         chsc_resp = (void *)&scpd_area->response;
 800         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 801 out:
 802         spin_unlock_irqrestore(&chsc_page_lock, flags);
 803         return ret;
 804 }
 805
 806 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 807                                           struct channel_path_desc_fmt1 *desc)
 808 {
 809         struct chsc_response_struct *chsc_resp;
 810         struct chsc_scpd *scpd_area;
 811         int ret;
 812
 813         spin_lock_irq(&chsc_page_lock);
 814         scpd_area = chsc_page;
 815         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
 816         if (ret)
 817                 goto out;
 818         chsc_resp = (void *)&scpd_area->response;
 819         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 820 out:
 821         spin_unlock_irq(&chsc_page_lock);
 822         return ret;
 823 }
 824
 825 static void
 826 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 827                           struct cmg_chars *chars)
 828 {
 829         struct cmg_chars *cmg_chars;
 830         int i, mask;
 831
 832         cmg_chars = chp->cmg_chars;
 833         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 834                 mask = 0x80 >> (i + 3);
 835                 if (cmcv & mask)
 836                         cmg_chars->values[i] = chars->values[i];
 837                 else
 838                         cmg_chars->values[i] = 0;
 839         }
 840 }
 841
 842 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 843 {
 844         struct cmg_chars *cmg_chars;
 845         int ccode, ret;
 846
 847         struct {
 848                 struct chsc_header request;
 849                 u32 : 24;
 850                 u32 first_chpid : 8;
 851                 u32 : 24;
 852                 u32 last_chpid : 8;
 853                 u32 zeroes1;
 854                 struct chsc_header response;
 855                 u32 zeroes2;
 856                 u32 not_valid : 1;
 857                 u32 shared : 1;
 858                 u32 : 22;
 859                 u32 chpid : 8;
 860                 u32 cmcv : 5;
 861                 u32 : 11;
 862                 u32 cmgq : 8;
 863                 u32 cmg : 8;
 864                 u32 zeroes3;
 865                 u32 data[NR_MEASUREMENT_CHARS];
 866         } __attribute__ ((packed)) *scmc_area;
 867
 868         chp->cmg_chars = NULL;
 869         cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
 870         if (!cmg_chars)
 871                 return -ENOMEM;
 872
 873         spin_lock_irq(&chsc_page_lock);
 874         memset(chsc_page, 0, PAGE_SIZE);
 875         scmc_area = chsc_page;
 876         scmc_area->request.length = 0x0010;
 877         scmc_area->request.code = 0x0022;
 878         scmc_area->first_chpid = chp->chpid.id;
 879         scmc_area->last_chpid = chp->chpid.id;
 880
 881         ccode = chsc(scmc_area);
 882         if (ccode > 0) {
 883                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 884                 goto out;
 885         }
 886
 887         ret = chsc_error_from_response(scmc_area->response.code);
 888         if (ret) {
 889                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 890                               scmc_area->response.code);
 891                 goto out;
 892         }
 893         if (scmc_area->not_valid) {
 894                 chp->cmg = -1;
 895                 chp->shared = -1;
 896                 goto out;
 897         }
 898         chp->cmg = scmc_area->cmg;
 899         chp->shared = scmc_area->shared;
 900         if (chp->cmg != 2 && chp->cmg != 3) {
 901                 /* No cmg-dependent data. */
 902                 goto out;
 903         }
 904         chp->cmg_chars = cmg_chars;
 905         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 906                                   (struct cmg_chars *) &scmc_area->data);
 907 out:
 908         spin_unlock_irq(&chsc_page_lock);
 909         if (!chp->cmg_chars)
 910                 kfree(cmg_chars);
 911
 912         return ret;
 913 }
 914
 915 int __init chsc_init(void)
 916 {
 917         int ret;
 918
 919         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 920         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 921         if (!sei_page || !chsc_page) {
 922                 ret = -ENOMEM;
 923                 goto out_err;
 924         }
 925         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
 926         if (ret)
 927                 goto out_err;
 928         return ret;
 929 out_err:
 930         free_page((unsigned long)chsc_page);
 931         free_page((unsigned long)sei_page);
 932         return ret;
 933 }
 934
 935 void __init chsc_init_cleanup(void)
 936 {
 937         crw_unregister_handler(CRW_RSC_CSS);
 938         free_page((unsigned long)chsc_page);
 939         free_page((unsigned long)sei_page);
 940 }
 941
 942 int chsc_enable_facility(int operation_code)
 943 {
 944         unsigned long flags;
 945         int ret;
 946         struct {
 947                 struct chsc_header request;
 948                 u8 reserved1:4;
 949                 u8 format:4;
 950                 u8 reserved2;
 951                 u16 operation_code;
 952                 u32 reserved3;
 953                 u32 reserved4;
 954                 u32 operation_data_area[252];
 955                 struct chsc_header response;
 956                 u32 reserved5:4;
 957                 u32 format2:4;
 958                 u32 reserved6:24;
 959         } __attribute__ ((packed)) *sda_area;
 960
 961         spin_lock_irqsave(&chsc_page_lock, flags);
 962         memset(chsc_page, 0, PAGE_SIZE);
 963         sda_area = chsc_page;
 964         sda_area->request.length = 0x0400;
 965         sda_area->request.code = 0x0031;
 966         sda_area->operation_code = operation_code;
 967
 968         ret = chsc(sda_area);
 969         if (ret > 0) {
 970                 ret = (ret == 3) ? -ENODEV : -EBUSY;
 971                 goto out;
 972         }
 973
 974         switch (sda_area->response.code) {
 975         case 0x0101:
 976                 ret = -EOPNOTSUPP;
 977                 break;
 978         default:
 979                 ret = chsc_error_from_response(sda_area->response.code);
 980         }
 981         if (ret != 0)
 982                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
 983                               operation_code, sda_area->response.code);
 984 out:
 985         spin_unlock_irqrestore(&chsc_page_lock, flags);
 986         return ret;
 987 }
 988
 989 struct css_general_char css_general_characteristics;
 990 struct css_chsc_char css_chsc_characteristics;
 991
 992 int __init
 993 chsc_determine_css_characteristics(void)
 994 {
 995         int result;
 996         struct {
 997                 struct chsc_header request;
 998                 u32 reserved1;
 999                 u32 reserved2;
1000                 u32 reserved3;
1001                 struct chsc_header response;
1002                 u32 reserved4;
1003                 u32 general_char[510];
1004                 u32 chsc_char[508];
1005         } __attribute__ ((packed)) *scsc_area;
1006
1007         spin_lock_irq(&chsc_page_lock);
1008         memset(chsc_page, 0, PAGE_SIZE);
1009         scsc_area = chsc_page;
1010         scsc_area->request.length = 0x0010;
1011         scsc_area->request.code = 0x0010;
1012
1013         result = chsc(scsc_area);
1014         if (result) {
1015                 result = (result == 3) ? -ENODEV : -EBUSY;
1016                 goto exit;
1017         }
1018
1019         result = chsc_error_from_response(scsc_area->response.code);
1020         if (result == 0) {
1021                 memcpy(&css_general_characteristics, scsc_area->general_char,
1022                        sizeof(css_general_characteristics));
1023                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1024                        sizeof(css_chsc_characteristics));
1025         } else
1026                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1027                               scsc_area->response.code);
1028 exit:
1029         spin_unlock_irq(&chsc_page_lock);
1030         return result;
1031 }
1032
1033 EXPORT_SYMBOL_GPL(css_general_characteristics);
1034 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1035
1036 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
1037 {
1038         struct {
1039                 struct chsc_header request;
1040                 unsigned int rsvd0;
1041                 unsigned int op : 8;
1042                 unsigned int rsvd1 : 8;
1043                 unsigned int ctrl : 16;
1044                 unsigned int rsvd2[5];
1045                 struct chsc_header response;
1046                 unsigned int rsvd3[7];
1047         } __attribute__ ((packed)) *rr;
1048         int rc;
1049
1050         memset(page, 0, PAGE_SIZE);
1051         rr = page;
1052         rr->request.length = 0x0020;
1053         rr->request.code = 0x0033;
1054         rr->op = op;
1055         rr->ctrl = ctrl;
1056         rc = chsc(rr);
1057         if (rc)
1058                 return -EIO;
1059         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1060         return rc;
1061 }
1062
1063 int chsc_sstpi(void *page, void *result, size_t size)
1064 {
1065         struct {
1066                 struct chsc_header request;
1067                 unsigned int rsvd0[3];
1068                 struct chsc_header response;
1069                 char data[size];
1070         } __attribute__ ((packed)) *rr;
1071         int rc;
1072
1073         memset(page, 0, PAGE_SIZE);
1074         rr = page;
1075         rr->request.length = 0x0010;
1076         rr->request.code = 0x0038;
1077         rc = chsc(rr);
1078         if (rc)
1079                 return -EIO;
1080         memcpy(result, &rr->data, size);
1081         return (rr->response.code == 0x0001) ? 0 : -EIO;
1082 }
1083
1084 int chsc_siosl(struct subchannel_id schid)
1085 {
1086         struct {
1087                 struct chsc_header request;
1088                 u32 word1;
1089                 struct subchannel_id sid;
1090                 u32 word3;
1091                 struct chsc_header response;
1092                 u32 word[11];
1093         } __attribute__ ((packed)) *siosl_area;
1094         unsigned long flags;
1095         int ccode;
1096         int rc;
1097
1098         spin_lock_irqsave(&chsc_page_lock, flags);
1099         memset(chsc_page, 0, PAGE_SIZE);
1100         siosl_area = chsc_page;
1101         siosl_area->request.length = 0x0010;
1102         siosl_area->request.code = 0x0046;
1103         siosl_area->word1 = 0x80000000;
1104         siosl_area->sid = schid;
1105
1106         ccode = chsc(siosl_area);
1107         if (ccode > 0) {
1108                 if (ccode == 3)
1109                         rc = -ENODEV;
1110                 else
1111                         rc = -EBUSY;
1112                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1113                               schid.ssid, schid.sch_no, ccode);
1114                 goto out;
1115         }
1116         rc = chsc_error_from_response(siosl_area->response.code);
1117         if (rc)
1118                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1119                               schid.ssid, schid.sch_no,
1120                               siosl_area->response.code);
1121         else
1122                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1123                               schid.ssid, schid.sch_no);
1124 out:
1125         spin_unlock_irqrestore(&chsc_page_lock, flags);
1126         return rc;
1127 }
1128 EXPORT_SYMBOL_GPL(chsc_siosl);
1129
1130 /**
1131  * chsc_scm_info() - store SCM information (SSI)
1132  * @scm_area: request and response block for SSI
1133  * @token: continuation token
1134  *
1135  * Returns 0 on success.
1136  */
1137 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1138 {
1139         int ccode, ret;
1140
1141         memset(scm_area, 0, sizeof(*scm_area));
1142         scm_area->request.length = 0x0020;
1143         scm_area->request.code = 0x004C;
1144         scm_area->reqtok = token;
1145
1146         ccode = chsc(scm_area);
1147         if (ccode > 0) {
1148                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1149                 goto out;
1150         }
1151         ret = chsc_error_from_response(scm_area->response.code);
1152         if (ret != 0)
1153                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1154                               scm_area->response.code);
1155 out:
1156         return ret;
1157 }
1158 EXPORT_SYMBOL_GPL(chsc_scm_info);