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 /**
 148  * chsc_ssqd() - store subchannel QDIO data (SSQD)
 149  * @schid: id of the subchannel on which SSQD is performed
 150  * @ssqd: request and response block for SSQD
 151  *
 152  * Returns 0 on success.
 153  */
 154 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 155 {
 156         memset(ssqd, 0, sizeof(*ssqd));
 157         ssqd->request.length = 0x0010;
 158         ssqd->request.code = 0x0024;
 159         ssqd->first_sch = schid.sch_no;
 160         ssqd->last_sch = schid.sch_no;
 161         ssqd->ssid = schid.ssid;
 162
 163         if (chsc(ssqd))
 164                 return -EIO;
 165
 166         return chsc_error_from_response(ssqd->response.code);
 167 }
 168 EXPORT_SYMBOL_GPL(chsc_ssqd);
 169
 170 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 171 {
 172         spin_lock_irq(sch->lock);
 173         if (sch->driver && sch->driver->chp_event)
 174                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 175                         goto out_unreg;
 176         spin_unlock_irq(sch->lock);
 177         return 0;
 178
 179 out_unreg:
 180         sch->lpm = 0;
 181         spin_unlock_irq(sch->lock);
 182         css_schedule_eval(sch->schid);
 183         return 0;
 184 }
 185
 186 void chsc_chp_offline(struct chp_id chpid)
 187 {
 188         char dbf_txt[15];
 189         struct chp_link link;
 190
 191         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 192         CIO_TRACE_EVENT(2, dbf_txt);
 193
 194         if (chp_get_status(chpid) <= 0)
 195                 return;
 196         memset(&link, 0, sizeof(struct chp_link));
 197         link.chpid = chpid;
 198         /* Wait until previous actions have settled. */
 199         css_wait_for_slow_path();
 200         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 201 }
 202
 203 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
 204 {
 205         struct schib schib;
 206         /*
 207          * We don't know the device yet, but since a path
 208          * may be available now to the device we'll have
 209          * to do recognition again.
 210          * Since we don't have any idea about which chpid
 211          * that beast may be on we'll have to do a stsch
 212          * on all devices, grr...
 213          */
 214         if (stsch_err(schid, &schib))
 215                 /* We're through */
 216                 return -ENXIO;
 217
 218         /* Put it on the slow path. */
 219         css_schedule_eval(schid);
 220         return 0;
 221 }
 222
 223 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 224 {
 225         spin_lock_irq(sch->lock);
 226         if (sch->driver && sch->driver->chp_event)
 227                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 228         spin_unlock_irq(sch->lock);
 229
 230         return 0;
 231 }
 232
 233 static void s390_process_res_acc(struct chp_link *link)
 234 {
 235         char dbf_txt[15];
 236
 237         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 238                 link->chpid.id);
 239         CIO_TRACE_EVENT( 2, dbf_txt);
 240         if (link->fla != 0) {
 241                 sprintf(dbf_txt, "fla%x", link->fla);
 242                 CIO_TRACE_EVENT( 2, dbf_txt);
 243         }
 244         /* Wait until previous actions have settled. */
 245         css_wait_for_slow_path();
 246         /*
 247          * I/O resources may have become accessible.
 248          * Scan through all subchannels that may be concerned and
 249          * do a validation on those.
 250          * The more information we have (info), the less scanning
 251          * will we have to do.
 252          */
 253         for_each_subchannel_staged(__s390_process_res_acc,
 254                                    s390_process_res_acc_new_sch, link);
 255 }
 256
 257 static int
 258 __get_chpid_from_lir(void *data)
 259 {
 260         struct lir {
 261                 u8  iq;
 262                 u8  ic;
 263                 u16 sci;
 264                 /* incident-node descriptor */
 265                 u32 indesc[28];
 266                 /* attached-node descriptor */
 267                 u32 andesc[28];
 268                 /* incident-specific information */
 269                 u32 isinfo[28];
 270         } __attribute__ ((packed)) *lir;
 271
 272         lir = data;
 273         if (!(lir->iq&0x80))
 274                 /* NULL link incident record */
 275                 return -EINVAL;
 276         if (!(lir->indesc[0]&0xc0000000))
 277                 /* node descriptor not valid */
 278                 return -EINVAL;
 279         if (!(lir->indesc[0]&0x10000000))
 280                 /* don't handle device-type nodes - FIXME */
 281                 return -EINVAL;
 282         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
 283
 284         return (u16) (lir->indesc[0]&0x000000ff);
 285 }
 286
 287 struct chsc_sei_nt0_area {
 288         u8  flags;
 289         u8  vf;                         /* validity flags */
 290         u8  rs;                         /* reporting source */
 291         u8  cc;                         /* content code */
 292         u16 fla;                        /* full link address */
 293         u16 rsid;                       /* reporting source id */
 294         u32 reserved1;
 295         u32 reserved2;
 296         /* ccdf has to be big enough for a link-incident record */
 297         u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 298 } __packed;
 299
 300 struct chsc_sei_nt2_area {
 301         u8  flags;                      /* p and v bit */
 302         u8  reserved1;
 303         u8  reserved2;
 304         u8  cc;                         /* content code */
 305         u32 reserved3[13];
 306         u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 307 } __packed;
 308
 309 #define CHSC_SEI_NT0    (1ULL << 63)
 310 #define CHSC_SEI_NT2    (1ULL << 61)
 311
 312 struct chsc_sei {
 313         struct chsc_header request;
 314         u32 reserved1;
 315         u64 ntsm;                       /* notification type mask */
 316         struct chsc_header response;
 317         u32 :24;
 318         u8 nt;
 319         union {
 320                 struct chsc_sei_nt0_area nt0_area;
 321                 struct chsc_sei_nt2_area nt2_area;
 322                 u8 nt_area[PAGE_SIZE - 24];
 323         } u;
 324 } __packed;
 325
 326 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 327 {
 328         struct chp_id chpid;
 329         int id;
 330
 331         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
 332                       sei_area->rs, sei_area->rsid);
 333         if (sei_area->rs != 4)
 334                 return;
 335         id = __get_chpid_from_lir(sei_area->ccdf);
 336         if (id < 0)
 337                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
 338         else {
 339                 chp_id_init(&chpid);
 340                 chpid.id = id;
 341                 chsc_chp_offline(chpid);
 342         }
 343 }
 344
 345 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 346 {
 347         struct chp_link link;
 348         struct chp_id chpid;
 349         int status;
 350
 351         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 352                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 353         if (sei_area->rs != 4)
 354                 return;
 355         chp_id_init(&chpid);
 356         chpid.id = sei_area->rsid;
 357         /* allocate a new channel path structure, if needed */
 358         status = chp_get_status(chpid);
 359         if (status < 0)
 360                 chp_new(chpid);
 361         else if (!status)
 362                 return;
 363         memset(&link, 0, sizeof(struct chp_link));
 364         link.chpid = chpid;
 365         if ((sei_area->vf & 0xc0) != 0) {
 366                 link.fla = sei_area->fla;
 367                 if ((sei_area->vf & 0xc0) == 0xc0)
 368                         /* full link address */
 369                         link.fla_mask = 0xffff;
 370                 else
 371                         /* link address */
 372                         link.fla_mask = 0xff00;
 373         }
 374         s390_process_res_acc(&link);
 375 }
 376
 377 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 378 {
 379         struct channel_path *chp;
 380         struct chp_id chpid;
 381         u8 *data;
 382         int num;
 383
 384         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 385         if (sei_area->rs != 0)
 386                 return;
 387         data = sei_area->ccdf;
 388         chp_id_init(&chpid);
 389         for (num = 0; num <= __MAX_CHPID; num++) {
 390                 if (!chp_test_bit(data, num))
 391                         continue;
 392                 chpid.id = num;
 393
 394                 CIO_CRW_EVENT(4, "Update information for channel path "
 395                               "%x.%02x\n", chpid.cssid, chpid.id);
 396                 chp = chpid_to_chp(chpid);
 397                 if (!chp) {
 398                         chp_new(chpid);
 399                         continue;
 400                 }
 401                 mutex_lock(&chp->lock);
 402                 chp_update_desc(chp);
 403                 mutex_unlock(&chp->lock);
 404         }
 405 }
 406
 407 struct chp_config_data {
 408         u8 map[32];
 409         u8 op;
 410         u8 pc;
 411 };
 412
 413 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 414 {
 415         struct chp_config_data *data;
 416         struct chp_id chpid;
 417         int num;
 418         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 419
 420         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 421         if (sei_area->rs != 0)
 422                 return;
 423         data = (struct chp_config_data *) &(sei_area->ccdf);
 424         chp_id_init(&chpid);
 425         for (num = 0; num <= __MAX_CHPID; num++) {
 426                 if (!chp_test_bit(data->map, num))
 427                         continue;
 428                 chpid.id = num;
 429                 pr_notice("Processing %s for channel path %x.%02x\n",
 430                           events[data->op], chpid.cssid, chpid.id);
 431                 switch (data->op) {
 432                 case 0:
 433                         chp_cfg_schedule(chpid, 1);
 434                         break;
 435                 case 1:
 436                         chp_cfg_schedule(chpid, 0);
 437                         break;
 438                 case 2:
 439                         chp_cfg_cancel_deconfigure(chpid);
 440                         break;
 441                 }
 442         }
 443 }
 444
 445 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 446 {
 447         int ret;
 448
 449         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 450         if (sei_area->rs != 7)
 451                 return;
 452
 453         ret = scm_update_information();
 454         if (ret)
 455                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 456                               " failed (rc=%d).\n", ret);
 457 }
 458
 459 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 460 {
 461         int ret;
 462
 463         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 464         if (sei_area->rs != 7)
 465                 return;
 466
 467         ret = scm_process_availability_information();
 468         if (ret)
 469                 CIO_CRW_EVENT(0, "chsc: process availability information"
 470                               " failed (rc=%d).\n", ret);
 471 }
 472
 473 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 474 {
 475         switch (sei_area->cc) {
 476         case 1:
 477                 zpci_event_error(sei_area->ccdf);
 478                 break;
 479         case 2:
 480                 zpci_event_availability(sei_area->ccdf);
 481                 break;
 482         default:
 483                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 484                               sei_area->cc);
 485                 break;
 486         }
 487 }
 488
 489 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 490 {
 491         /* which kind of information was stored? */
 492         switch (sei_area->cc) {
 493         case 1: /* link incident*/
 494                 chsc_process_sei_link_incident(sei_area);
 495                 break;
 496         case 2: /* i/o resource accessibility */
 497                 chsc_process_sei_res_acc(sei_area);
 498                 break;
 499         case 7: /* channel-path-availability information */
 500                 chsc_process_sei_chp_avail(sei_area);
 501                 break;
 502         case 8: /* channel-path-configuration notification */
 503                 chsc_process_sei_chp_config(sei_area);
 504                 break;
 505         case 12: /* scm change notification */
 506                 chsc_process_sei_scm_change(sei_area);
 507                 break;
 508         case 14: /* scm available notification */
 509                 chsc_process_sei_scm_avail(sei_area);
 510                 break;
 511         default: /* other stuff */
 512                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 513                               sei_area->cc);
 514                 break;
 515         }
 516
 517         /* Check if we might have lost some information. */
 518         if (sei_area->flags & 0x40) {
 519                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 520                 css_schedule_eval_all();
 521         }
 522 }
 523
 524 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 525 {
 526         do {
 527                 memset(sei, 0, sizeof(*sei));
 528                 sei->request.length = 0x0010;
 529                 sei->request.code = 0x000e;
 530                 sei->ntsm = ntsm;
 531
 532                 if (chsc(sei))
 533                         break;
 534
 535                 if (sei->response.code != 0x0001) {
 536                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 537                                       sei->response.code);
 538                         break;
 539                 }
 540
 541                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 542                 switch (sei->nt) {
 543                 case 0:
 544                         chsc_process_sei_nt0(&sei->u.nt0_area);
 545                         break;
 546                 case 2:
 547                         chsc_process_sei_nt2(&sei->u.nt2_area);
 548                         break;
 549                 default:
 550                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 551                         break;
 552                 }
 553         } while (sei->u.nt0_area.flags & 0x80);
 554 }
 555
 556 /*
 557  * Handle channel subsystem related CRWs.
 558  * Use store event information to find out what's going on.
 559  *
 560  * Note: Access to sei_page is serialized through machine check handler
 561  * thread, so no need for locking.
 562  */
 563 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 564 {
 565         struct chsc_sei *sei = sei_page;
 566
 567         if (overflow) {
 568                 css_schedule_eval_all();
 569                 return;
 570         }
 571         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 572                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 573                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 574                       crw0->erc, crw0->rsid);
 575
 576         CIO_TRACE_EVENT(2, "prcss");
 577         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 578 }
 579
 580 void chsc_chp_online(struct chp_id chpid)
 581 {
 582         char dbf_txt[15];
 583         struct chp_link link;
 584
 585         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 586         CIO_TRACE_EVENT(2, dbf_txt);
 587
 588         if (chp_get_status(chpid) != 0) {
 589                 memset(&link, 0, sizeof(struct chp_link));
 590                 link.chpid = chpid;
 591                 /* Wait until previous actions have settled. */
 592                 css_wait_for_slow_path();
 593                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 594                                            &link);
 595         }
 596 }
 597
 598 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 599                                          struct chp_id chpid, int on)
 600 {
 601         unsigned long flags;
 602         struct chp_link link;
 603
 604         memset(&link, 0, sizeof(struct chp_link));
 605         link.chpid = chpid;
 606         spin_lock_irqsave(sch->lock, flags);
 607         if (sch->driver && sch->driver->chp_event)
 608                 sch->driver->chp_event(sch, &link,
 609                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 610         spin_unlock_irqrestore(sch->lock, flags);
 611 }
 612
 613 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 614 {
 615         struct chp_id *chpid = data;
 616
 617         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 618         return 0;
 619 }
 620
 621 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 622 {
 623         struct chp_id *chpid = data;
 624
 625         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 626         return 0;
 627 }
 628
 629 static int
 630 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 631 {
 632         struct schib schib;
 633
 634         if (stsch_err(schid, &schib))
 635                 /* We're through */
 636                 return -ENXIO;
 637         /* Put it on the slow path. */
 638         css_schedule_eval(schid);
 639         return 0;
 640 }
 641
 642 /**
 643  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 644  * @chpid: channl-path ID
 645  * @on: non-zero for vary online, zero for vary offline
 646  */
 647 int chsc_chp_vary(struct chp_id chpid, int on)
 648 {
 649         struct channel_path *chp = chpid_to_chp(chpid);
 650
 651         /* Wait until previous actions have settled. */
 652         css_wait_for_slow_path();
 653         /*
 654          * Redo PathVerification on the devices the chpid connects to
 655          */
 656         if (on) {
 657                 /* Try to update the channel path description. */
 658                 chp_update_desc(chp);
 659                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 660                                            __s390_vary_chpid_on, &chpid);
 661         } else
 662                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 663                                            NULL, &chpid);
 664
 665         return 0;
 666 }
 667
 668 static void
 669 chsc_remove_cmg_attr(struct channel_subsystem *css)
 670 {
 671         int i;
 672
 673         for (i = 0; i <= __MAX_CHPID; i++) {
 674                 if (!css->chps[i])
 675                         continue;
 676                 chp_remove_cmg_attr(css->chps[i]);
 677         }
 678 }
 679
 680 static int
 681 chsc_add_cmg_attr(struct channel_subsystem *css)
 682 {
 683         int i, ret;
 684
 685         ret = 0;
 686         for (i = 0; i <= __MAX_CHPID; i++) {
 687                 if (!css->chps[i])
 688                         continue;
 689                 ret = chp_add_cmg_attr(css->chps[i]);
 690                 if (ret)
 691                         goto cleanup;
 692         }
 693         return ret;
 694 cleanup:
 695         for (--i; i >= 0; i--) {
 696                 if (!css->chps[i])
 697                         continue;
 698                 chp_remove_cmg_attr(css->chps[i]);
 699         }
 700         return ret;
 701 }
 702
 703 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 704 {
 705         struct {
 706                 struct chsc_header request;
 707                 u32 operation_code : 2;
 708                 u32 : 30;
 709                 u32 key : 4;
 710                 u32 : 28;
 711                 u32 zeroes1;
 712                 u32 cub_addr1;
 713                 u32 zeroes2;
 714                 u32 cub_addr2;
 715                 u32 reserved[13];
 716                 struct chsc_header response;
 717                 u32 status : 8;
 718                 u32 : 4;
 719                 u32 fmt : 4;
 720                 u32 : 16;
 721         } __attribute__ ((packed)) *secm_area;
 722         int ret, ccode;
 723
 724         spin_lock_irq(&chsc_page_lock);
 725         memset(chsc_page, 0, PAGE_SIZE);
 726         secm_area = chsc_page;
 727         secm_area->request.length = 0x0050;
 728         secm_area->request.code = 0x0016;
 729
 730         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 731         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 732         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 733
 734         secm_area->operation_code = enable ? 0 : 1;
 735
 736         ccode = chsc(secm_area);
 737         if (ccode > 0) {
 738                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 739                 goto out;
 740         }
 741
 742         switch (secm_area->response.code) {
 743         case 0x0102:
 744         case 0x0103:
 745                 ret = -EINVAL;
 746                 break;
 747         default:
 748                 ret = chsc_error_from_response(secm_area->response.code);
 749         }
 750         if (ret != 0)
 751                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 752                               secm_area->response.code);
 753 out:
 754         spin_unlock_irq(&chsc_page_lock);
 755         return ret;
 756 }
 757
 758 int
 759 chsc_secm(struct channel_subsystem *css, int enable)
 760 {
 761         int ret;
 762
 763         if (enable && !css->cm_enabled) {
 764                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 765                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 766                 if (!css->cub_addr1 || !css->cub_addr2) {
 767                         free_page((unsigned long)css->cub_addr1);
 768                         free_page((unsigned long)css->cub_addr2);
 769                         return -ENOMEM;
 770                 }
 771         }
 772         ret = __chsc_do_secm(css, enable);
 773         if (!ret) {
 774                 css->cm_enabled = enable;
 775                 if (css->cm_enabled) {
 776                         ret = chsc_add_cmg_attr(css);
 777                         if (ret) {
 778                                 __chsc_do_secm(css, 0);
 779                                 css->cm_enabled = 0;
 780                         }
 781                 } else
 782                         chsc_remove_cmg_attr(css);
 783         }
 784         if (!css->cm_enabled) {
 785                 free_page((unsigned long)css->cub_addr1);
 786                 free_page((unsigned long)css->cub_addr2);
 787         }
 788         return ret;
 789 }
 790
 791 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 792                                      int c, int m, void *page)
 793 {
 794         struct chsc_scpd *scpd_area;
 795         int ccode, ret;
 796
 797         if ((rfmt == 1) && !css_general_characteristics.fcs)
 798                 return -EINVAL;
 799         if ((rfmt == 2) && !css_general_characteristics.cib)
 800                 return -EINVAL;
 801
 802         memset(page, 0, PAGE_SIZE);
 803         scpd_area = page;
 804         scpd_area->request.length = 0x0010;
 805         scpd_area->request.code = 0x0002;
 806         scpd_area->cssid = chpid.cssid;
 807         scpd_area->first_chpid = chpid.id;
 808         scpd_area->last_chpid = chpid.id;
 809         scpd_area->m = m;
 810         scpd_area->c = c;
 811         scpd_area->fmt = fmt;
 812         scpd_area->rfmt = rfmt;
 813
 814         ccode = chsc(scpd_area);
 815         if (ccode > 0)
 816                 return (ccode == 3) ? -ENODEV : -EBUSY;
 817
 818         ret = chsc_error_from_response(scpd_area->response.code);
 819         if (ret)
 820                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 821                               scpd_area->response.code);
 822         return ret;
 823 }
 824 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 825
 826 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 827                                           struct channel_path_desc *desc)
 828 {
 829         struct chsc_response_struct *chsc_resp;
 830         struct chsc_scpd *scpd_area;
 831         unsigned long flags;
 832         int ret;
 833
 834         spin_lock_irqsave(&chsc_page_lock, flags);
 835         scpd_area = chsc_page;
 836         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 837         if (ret)
 838                 goto out;
 839         chsc_resp = (void *)&scpd_area->response;
 840         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 841 out:
 842         spin_unlock_irqrestore(&chsc_page_lock, flags);
 843         return ret;
 844 }
 845
 846 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 847                                           struct channel_path_desc_fmt1 *desc)
 848 {
 849         struct chsc_response_struct *chsc_resp;
 850         struct chsc_scpd *scpd_area;
 851         unsigned long flags;
 852         int ret;
 853
 854         spin_lock_irqsave(&chsc_page_lock, flags);
 855         scpd_area = chsc_page;
 856         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
 857         if (ret)
 858                 goto out;
 859         chsc_resp = (void *)&scpd_area->response;
 860         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 861 out:
 862         spin_unlock_irqrestore(&chsc_page_lock, flags);
 863         return ret;
 864 }
 865
 866 static void
 867 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 868                           struct cmg_chars *chars)
 869 {
 870         struct cmg_chars *cmg_chars;
 871         int i, mask;
 872
 873         cmg_chars = chp->cmg_chars;
 874         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 875                 mask = 0x80 >> (i + 3);
 876                 if (cmcv & mask)
 877                         cmg_chars->values[i] = chars->values[i];
 878                 else
 879                         cmg_chars->values[i] = 0;
 880         }
 881 }
 882
 883 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 884 {
 885         struct cmg_chars *cmg_chars;
 886         int ccode, ret;
 887
 888         struct {
 889                 struct chsc_header request;
 890                 u32 : 24;
 891                 u32 first_chpid : 8;
 892                 u32 : 24;
 893                 u32 last_chpid : 8;
 894                 u32 zeroes1;
 895                 struct chsc_header response;
 896                 u32 zeroes2;
 897                 u32 not_valid : 1;
 898                 u32 shared : 1;
 899                 u32 : 22;
 900                 u32 chpid : 8;
 901                 u32 cmcv : 5;
 902                 u32 : 11;
 903                 u32 cmgq : 8;
 904                 u32 cmg : 8;
 905                 u32 zeroes3;
 906                 u32 data[NR_MEASUREMENT_CHARS];
 907         } __attribute__ ((packed)) *scmc_area;
 908
 909         chp->cmg_chars = NULL;
 910         cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
 911         if (!cmg_chars)
 912                 return -ENOMEM;
 913
 914         spin_lock_irq(&chsc_page_lock);
 915         memset(chsc_page, 0, PAGE_SIZE);
 916         scmc_area = chsc_page;
 917         scmc_area->request.length = 0x0010;
 918         scmc_area->request.code = 0x0022;
 919         scmc_area->first_chpid = chp->chpid.id;
 920         scmc_area->last_chpid = chp->chpid.id;
 921
 922         ccode = chsc(scmc_area);
 923         if (ccode > 0) {
 924                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 925                 goto out;
 926         }
 927
 928         ret = chsc_error_from_response(scmc_area->response.code);
 929         if (ret) {
 930                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 931                               scmc_area->response.code);
 932                 goto out;
 933         }
 934         if (scmc_area->not_valid) {
 935                 chp->cmg = -1;
 936                 chp->shared = -1;
 937                 goto out;
 938         }
 939         chp->cmg = scmc_area->cmg;
 940         chp->shared = scmc_area->shared;
 941         if (chp->cmg != 2 && chp->cmg != 3) {
 942                 /* No cmg-dependent data. */
 943                 goto out;
 944         }
 945         chp->cmg_chars = cmg_chars;
 946         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 947                                   (struct cmg_chars *) &scmc_area->data);
 948 out:
 949         spin_unlock_irq(&chsc_page_lock);
 950         if (!chp->cmg_chars)
 951                 kfree(cmg_chars);
 952
 953         return ret;
 954 }
 955
 956 int __init chsc_init(void)
 957 {
 958         int ret;
 959
 960         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 961         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 962         if (!sei_page || !chsc_page) {
 963                 ret = -ENOMEM;
 964                 goto out_err;
 965         }
 966         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
 967         if (ret)
 968                 goto out_err;
 969         return ret;
 970 out_err:
 971         free_page((unsigned long)chsc_page);
 972         free_page((unsigned long)sei_page);
 973         return ret;
 974 }
 975
 976 void __init chsc_init_cleanup(void)
 977 {
 978         crw_unregister_handler(CRW_RSC_CSS);
 979         free_page((unsigned long)chsc_page);
 980         free_page((unsigned long)sei_page);
 981 }
 982
 983 int chsc_enable_facility(int operation_code)
 984 {
 985         unsigned long flags;
 986         int ret;
 987         struct {
 988                 struct chsc_header request;
 989                 u8 reserved1:4;
 990                 u8 format:4;
 991                 u8 reserved2;
 992                 u16 operation_code;
 993                 u32 reserved3;
 994                 u32 reserved4;
 995                 u32 operation_data_area[252];
 996                 struct chsc_header response;
 997                 u32 reserved5:4;
 998                 u32 format2:4;
 999                 u32 reserved6:24;
1000         } __attribute__ ((packed)) *sda_area;
1001
1002         spin_lock_irqsave(&chsc_page_lock, flags);
1003         memset(chsc_page, 0, PAGE_SIZE);
1004         sda_area = chsc_page;
1005         sda_area->request.length = 0x0400;
1006         sda_area->request.code = 0x0031;
1007         sda_area->operation_code = operation_code;
1008
1009         ret = chsc(sda_area);
1010         if (ret > 0) {
1011                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1012                 goto out;
1013         }
1014
1015         switch (sda_area->response.code) {
1016         case 0x0101:
1017                 ret = -EOPNOTSUPP;
1018                 break;
1019         default:
1020                 ret = chsc_error_from_response(sda_area->response.code);
1021         }
1022         if (ret != 0)
1023                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1024                               operation_code, sda_area->response.code);
1025 out:
1026         spin_unlock_irqrestore(&chsc_page_lock, flags);
1027         return ret;
1028 }
1029
1030 struct css_general_char css_general_characteristics;
1031 struct css_chsc_char css_chsc_characteristics;
1032
1033 int __init
1034 chsc_determine_css_characteristics(void)
1035 {
1036         int result;
1037         struct {
1038                 struct chsc_header request;
1039                 u32 reserved1;
1040                 u32 reserved2;
1041                 u32 reserved3;
1042                 struct chsc_header response;
1043                 u32 reserved4;
1044                 u32 general_char[510];
1045                 u32 chsc_char[508];
1046         } __attribute__ ((packed)) *scsc_area;
1047
1048         spin_lock_irq(&chsc_page_lock);
1049         memset(chsc_page, 0, PAGE_SIZE);
1050         scsc_area = chsc_page;
1051         scsc_area->request.length = 0x0010;
1052         scsc_area->request.code = 0x0010;
1053
1054         result = chsc(scsc_area);
1055         if (result) {
1056                 result = (result == 3) ? -ENODEV : -EBUSY;
1057                 goto exit;
1058         }
1059
1060         result = chsc_error_from_response(scsc_area->response.code);
1061         if (result == 0) {
1062                 memcpy(&css_general_characteristics, scsc_area->general_char,
1063                        sizeof(css_general_characteristics));
1064                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1065                        sizeof(css_chsc_characteristics));
1066         } else
1067                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1068                               scsc_area->response.code);
1069 exit:
1070         spin_unlock_irq(&chsc_page_lock);
1071         return result;
1072 }
1073
1074 EXPORT_SYMBOL_GPL(css_general_characteristics);
1075 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1076
1077 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
1078 {
1079         struct {
1080                 struct chsc_header request;
1081                 unsigned int rsvd0;
1082                 unsigned int op : 8;
1083                 unsigned int rsvd1 : 8;
1084                 unsigned int ctrl : 16;
1085                 unsigned int rsvd2[5];
1086                 struct chsc_header response;
1087                 unsigned int rsvd3[7];
1088         } __attribute__ ((packed)) *rr;
1089         int rc;
1090
1091         memset(page, 0, PAGE_SIZE);
1092         rr = page;
1093         rr->request.length = 0x0020;
1094         rr->request.code = 0x0033;
1095         rr->op = op;
1096         rr->ctrl = ctrl;
1097         rc = chsc(rr);
1098         if (rc)
1099                 return -EIO;
1100         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1101         return rc;
1102 }
1103
1104 int chsc_sstpi(void *page, void *result, size_t size)
1105 {
1106         struct {
1107                 struct chsc_header request;
1108                 unsigned int rsvd0[3];
1109                 struct chsc_header response;
1110                 char data[size];
1111         } __attribute__ ((packed)) *rr;
1112         int rc;
1113
1114         memset(page, 0, PAGE_SIZE);
1115         rr = page;
1116         rr->request.length = 0x0010;
1117         rr->request.code = 0x0038;
1118         rc = chsc(rr);
1119         if (rc)
1120                 return -EIO;
1121         memcpy(result, &rr->data, size);
1122         return (rr->response.code == 0x0001) ? 0 : -EIO;
1123 }
1124
1125 int chsc_siosl(struct subchannel_id schid)
1126 {
1127         struct {
1128                 struct chsc_header request;
1129                 u32 word1;
1130                 struct subchannel_id sid;
1131                 u32 word3;
1132                 struct chsc_header response;
1133                 u32 word[11];
1134         } __attribute__ ((packed)) *siosl_area;
1135         unsigned long flags;
1136         int ccode;
1137         int rc;
1138
1139         spin_lock_irqsave(&chsc_page_lock, flags);
1140         memset(chsc_page, 0, PAGE_SIZE);
1141         siosl_area = chsc_page;
1142         siosl_area->request.length = 0x0010;
1143         siosl_area->request.code = 0x0046;
1144         siosl_area->word1 = 0x80000000;
1145         siosl_area->sid = schid;
1146
1147         ccode = chsc(siosl_area);
1148         if (ccode > 0) {
1149                 if (ccode == 3)
1150                         rc = -ENODEV;
1151                 else
1152                         rc = -EBUSY;
1153                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1154                               schid.ssid, schid.sch_no, ccode);
1155                 goto out;
1156         }
1157         rc = chsc_error_from_response(siosl_area->response.code);
1158         if (rc)
1159                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1160                               schid.ssid, schid.sch_no,
1161                               siosl_area->response.code);
1162         else
1163                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1164                               schid.ssid, schid.sch_no);
1165 out:
1166         spin_unlock_irqrestore(&chsc_page_lock, flags);
1167         return rc;
1168 }
1169 EXPORT_SYMBOL_GPL(chsc_siosl);
1170
1171 /**
1172  * chsc_scm_info() - store SCM information (SSI)
1173  * @scm_area: request and response block for SSI
1174  * @token: continuation token
1175  *
1176  * Returns 0 on success.
1177  */
1178 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1179 {
1180         int ccode, ret;
1181
1182         memset(scm_area, 0, sizeof(*scm_area));
1183         scm_area->request.length = 0x0020;
1184         scm_area->request.code = 0x004C;
1185         scm_area->reqtok = token;
1186
1187         ccode = chsc(scm_area);
1188         if (ccode > 0) {
1189                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1190                 goto out;
1191         }
1192         ret = chsc_error_from_response(scm_area->response.code);
1193         if (ret != 0)
1194                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1195                               scm_area->response.code);
1196 out:
1197         return ret;
1198 }
1199 EXPORT_SYMBOL_GPL(chsc_scm_info);