drivers/s390/cio/chsc.c

   1 /*
   2  *  drivers/s390/cio/chsc.c
   3  *   S/390 common I/O routines -- channel subsystem call
   4  *
   5  *    Copyright IBM Corp. 1999,2010
   6  *    Author(s): Ingo Adlung (adlung@de.ibm.com)
   7  *               Cornelia Huck (cornelia.huck@de.ibm.com)
   8  *               Arnd Bergmann (arndb@de.ibm.com)
   9  */
  10
  11 #define KMSG_COMPONENT "cio"
  12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/init.h>
  17 #include <linux/device.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         default:
  57                 return -EIO;
  58         }
  59 }
  60 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  61
  62 struct chsc_ssd_area {
  63         struct chsc_header request;
  64         u16 :10;
  65         u16 ssid:2;
  66         u16 :4;
  67         u16 f_sch;        /* first subchannel */
  68         u16 :16;
  69         u16 l_sch;        /* last subchannel */
  70         u32 :32;
  71         struct chsc_header response;
  72         u32 :32;
  73         u8 sch_valid : 1;
  74         u8 dev_valid : 1;
  75         u8 st        : 3; /* subchannel type */
  76         u8 zeroes    : 3;
  77         u8  unit_addr;    /* unit address */
  78         u16 devno;        /* device number */
  79         u8 path_mask;
  80         u8 fla_valid_mask;
  81         u16 sch;          /* subchannel */
  82         u8 chpid[8];      /* chpids 0-7 */
  83         u16 fla[8];       /* full link addresses 0-7 */
  84 } __attribute__ ((packed));
  85
  86 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  87 {
  88         struct chsc_ssd_area *ssd_area;
  89         int ccode;
  90         int ret;
  91         int i;
  92         int mask;
  93
  94         spin_lock_irq(&chsc_page_lock);
  95         memset(chsc_page, 0, PAGE_SIZE);
  96         ssd_area = chsc_page;
  97         ssd_area->request.length = 0x0010;
  98         ssd_area->request.code = 0x0004;
  99         ssd_area->ssid = schid.ssid;
 100         ssd_area->f_sch = schid.sch_no;
 101         ssd_area->l_sch = schid.sch_no;
 102
 103         ccode = chsc(ssd_area);
 104         /* Check response. */
 105         if (ccode > 0) {
 106                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 107                 goto out;
 108         }
 109         ret = chsc_error_from_response(ssd_area->response.code);
 110         if (ret != 0) {
 111                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 112                               schid.ssid, schid.sch_no,
 113                               ssd_area->response.code);
 114                 goto out;
 115         }
 116         if (!ssd_area->sch_valid) {
 117                 ret = -ENODEV;
 118                 goto out;
 119         }
 120         /* Copy data */
 121         ret = 0;
 122         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 123         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 124             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 125                 goto out;
 126         ssd->path_mask = ssd_area->path_mask;
 127         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 128         for (i = 0; i < 8; i++) {
 129                 mask = 0x80 >> i;
 130                 if (ssd_area->path_mask & mask) {
 131                         chp_id_init(&ssd->chpid[i]);
 132                         ssd->chpid[i].id = ssd_area->chpid[i];
 133                 }
 134                 if (ssd_area->fla_valid_mask & mask)
 135                         ssd->fla[i] = ssd_area->fla[i];
 136         }
 137 out:
 138         spin_unlock_irq(&chsc_page_lock);
 139         return ret;
 140 }
 141
 142 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 143 {
 144         spin_lock_irq(sch->lock);
 145         if (sch->driver && sch->driver->chp_event)
 146                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 147                         goto out_unreg;
 148         spin_unlock_irq(sch->lock);
 149         return 0;
 150
 151 out_unreg:
 152         sch->lpm = 0;
 153         spin_unlock_irq(sch->lock);
 154         css_schedule_eval(sch->schid);
 155         return 0;
 156 }
 157
 158 void chsc_chp_offline(struct chp_id chpid)
 159 {
 160         char dbf_txt[15];
 161         struct chp_link link;
 162
 163         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 164         CIO_TRACE_EVENT(2, dbf_txt);
 165
 166         if (chp_get_status(chpid) <= 0)
 167                 return;
 168         memset(&link, 0, sizeof(struct chp_link));
 169         link.chpid = chpid;
 170         /* Wait until previous actions have settled. */
 171         css_wait_for_slow_path();
 172         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 173 }
 174
 175 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
 176 {
 177         struct schib schib;
 178         /*
 179          * We don't know the device yet, but since a path
 180          * may be available now to the device we'll have
 181          * to do recognition again.
 182          * Since we don't have any idea about which chpid
 183          * that beast may be on we'll have to do a stsch
 184          * on all devices, grr...
 185          */
 186         if (stsch_err(schid, &schib))
 187                 /* We're through */
 188                 return -ENXIO;
 189
 190         /* Put it on the slow path. */
 191         css_schedule_eval(schid);
 192         return 0;
 193 }
 194
 195 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 196 {
 197         spin_lock_irq(sch->lock);
 198         if (sch->driver && sch->driver->chp_event)
 199                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 200         spin_unlock_irq(sch->lock);
 201
 202         return 0;
 203 }
 204
 205 static void s390_process_res_acc(struct chp_link *link)
 206 {
 207         char dbf_txt[15];
 208
 209         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 210                 link->chpid.id);
 211         CIO_TRACE_EVENT( 2, dbf_txt);
 212         if (link->fla != 0) {
 213                 sprintf(dbf_txt, "fla%x", link->fla);
 214                 CIO_TRACE_EVENT( 2, dbf_txt);
 215         }
 216         /* Wait until previous actions have settled. */
 217         css_wait_for_slow_path();
 218         /*
 219          * I/O resources may have become accessible.
 220          * Scan through all subchannels that may be concerned and
 221          * do a validation on those.
 222          * The more information we have (info), the less scanning
 223          * will we have to do.
 224          */
 225         for_each_subchannel_staged(__s390_process_res_acc,
 226                                    s390_process_res_acc_new_sch, link);
 227 }
 228
 229 static int
 230 __get_chpid_from_lir(void *data)
 231 {
 232         struct lir {
 233                 u8  iq;
 234                 u8  ic;
 235                 u16 sci;
 236                 /* incident-node descriptor */
 237                 u32 indesc[28];
 238                 /* attached-node descriptor */
 239                 u32 andesc[28];
 240                 /* incident-specific information */
 241                 u32 isinfo[28];
 242         } __attribute__ ((packed)) *lir;
 243
 244         lir = data;
 245         if (!(lir->iq&0x80))
 246                 /* NULL link incident record */
 247                 return -EINVAL;
 248         if (!(lir->indesc[0]&0xc0000000))
 249                 /* node descriptor not valid */
 250                 return -EINVAL;
 251         if (!(lir->indesc[0]&0x10000000))
 252                 /* don't handle device-type nodes - FIXME */
 253                 return -EINVAL;
 254         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
 255
 256         return (u16) (lir->indesc[0]&0x000000ff);
 257 }
 258
 259 struct chsc_sei_area {
 260         struct chsc_header request;
 261         u32 reserved1;
 262         u32 reserved2;
 263         u32 reserved3;
 264         struct chsc_header response;
 265         u32 reserved4;
 266         u8  flags;
 267         u8  vf;         /* validity flags */
 268         u8  rs;         /* reporting source */
 269         u8  cc;         /* content code */
 270         u16 fla;        /* full link address */
 271         u16 rsid;       /* reporting source id */
 272         u32 reserved5;
 273         u32 reserved6;
 274         u8 ccdf[4096 - 16 - 24];        /* content-code dependent field */
 275         /* ccdf has to be big enough for a link-incident record */
 276 } __attribute__ ((packed));
 277
 278 static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
 279 {
 280         struct chp_id chpid;
 281         int id;
 282
 283         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
 284                       sei_area->rs, sei_area->rsid);
 285         if (sei_area->rs != 4)
 286                 return;
 287         id = __get_chpid_from_lir(sei_area->ccdf);
 288         if (id < 0)
 289                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
 290         else {
 291                 chp_id_init(&chpid);
 292                 chpid.id = id;
 293                 chsc_chp_offline(chpid);
 294         }
 295 }
 296
 297 static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
 298 {
 299         struct chp_link link;
 300         struct chp_id chpid;
 301         int status;
 302
 303         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 304                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 305         if (sei_area->rs != 4)
 306                 return;
 307         chp_id_init(&chpid);
 308         chpid.id = sei_area->rsid;
 309         /* allocate a new channel path structure, if needed */
 310         status = chp_get_status(chpid);
 311         if (status < 0)
 312                 chp_new(chpid);
 313         else if (!status)
 314                 return;
 315         memset(&link, 0, sizeof(struct chp_link));
 316         link.chpid = chpid;
 317         if ((sei_area->vf & 0xc0) != 0) {
 318                 link.fla = sei_area->fla;
 319                 if ((sei_area->vf & 0xc0) == 0xc0)
 320                         /* full link address */
 321                         link.fla_mask = 0xffff;
 322                 else
 323                         /* link address */
 324                         link.fla_mask = 0xff00;
 325         }
 326         s390_process_res_acc(&link);
 327 }
 328
 329 struct chp_config_data {
 330         u8 map[32];
 331         u8 op;
 332         u8 pc;
 333 };
 334
 335 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
 336 {
 337         struct chp_config_data *data;
 338         struct chp_id chpid;
 339         int num;
 340         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 341
 342         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 343         if (sei_area->rs != 0)
 344                 return;
 345         data = (struct chp_config_data *) &(sei_area->ccdf);
 346         chp_id_init(&chpid);
 347         for (num = 0; num <= __MAX_CHPID; num++) {
 348                 if (!chp_test_bit(data->map, num))
 349                         continue;
 350                 chpid.id = num;
 351                 pr_notice("Processing %s for channel path %x.%02x\n",
 352                           events[data->op], chpid.cssid, chpid.id);
 353                 switch (data->op) {
 354                 case 0:
 355                         chp_cfg_schedule(chpid, 1);
 356                         break;
 357                 case 1:
 358                         chp_cfg_schedule(chpid, 0);
 359                         break;
 360                 case 2:
 361                         chp_cfg_cancel_deconfigure(chpid);
 362                         break;
 363                 }
 364         }
 365 }
 366
 367 static void chsc_process_sei(struct chsc_sei_area *sei_area)
 368 {
 369         /* Check if we might have lost some information. */
 370         if (sei_area->flags & 0x40) {
 371                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 372                 css_schedule_eval_all();
 373         }
 374         /* which kind of information was stored? */
 375         switch (sei_area->cc) {
 376         case 1: /* link incident*/
 377                 chsc_process_sei_link_incident(sei_area);
 378                 break;
 379         case 2: /* i/o resource accessibiliy */
 380                 chsc_process_sei_res_acc(sei_area);
 381                 break;
 382         case 8: /* channel-path-configuration notification */
 383                 chsc_process_sei_chp_config(sei_area);
 384                 break;
 385         default: /* other stuff */
 386                 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
 387                               sei_area->cc);
 388                 break;
 389         }
 390 }
 391
 392 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 393 {
 394         struct chsc_sei_area *sei_area;
 395
 396         if (overflow) {
 397                 css_schedule_eval_all();
 398                 return;
 399         }
 400         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 401                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 402                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 403                       crw0->erc, crw0->rsid);
 404         if (!sei_page)
 405                 return;
 406         /* Access to sei_page is serialized through machine check handler
 407          * thread, so no need for locking. */
 408         sei_area = sei_page;
 409
 410         CIO_TRACE_EVENT(2, "prcss");
 411         do {
 412                 memset(sei_area, 0, sizeof(*sei_area));
 413                 sei_area->request.length = 0x0010;
 414                 sei_area->request.code = 0x000e;
 415                 if (chsc(sei_area))
 416                         break;
 417
 418                 if (sei_area->response.code == 0x0001) {
 419                         CIO_CRW_EVENT(4, "chsc: sei successful\n");
 420                         chsc_process_sei(sei_area);
 421                 } else {
 422                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 423                                       sei_area->response.code);
 424                         break;
 425                 }
 426         } while (sei_area->flags & 0x80);
 427 }
 428
 429 void chsc_chp_online(struct chp_id chpid)
 430 {
 431         char dbf_txt[15];
 432         struct chp_link link;
 433
 434         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 435         CIO_TRACE_EVENT(2, dbf_txt);
 436
 437         if (chp_get_status(chpid) != 0) {
 438                 memset(&link, 0, sizeof(struct chp_link));
 439                 link.chpid = chpid;
 440                 /* Wait until previous actions have settled. */
 441                 css_wait_for_slow_path();
 442                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 443                                            &link);
 444         }
 445 }
 446
 447 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 448                                          struct chp_id chpid, int on)
 449 {
 450         unsigned long flags;
 451         struct chp_link link;
 452
 453         memset(&link, 0, sizeof(struct chp_link));
 454         link.chpid = chpid;
 455         spin_lock_irqsave(sch->lock, flags);
 456         if (sch->driver && sch->driver->chp_event)
 457                 sch->driver->chp_event(sch, &link,
 458                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 459         spin_unlock_irqrestore(sch->lock, flags);
 460 }
 461
 462 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 463 {
 464         struct chp_id *chpid = data;
 465
 466         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 467         return 0;
 468 }
 469
 470 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 471 {
 472         struct chp_id *chpid = data;
 473
 474         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 475         return 0;
 476 }
 477
 478 static int
 479 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 480 {
 481         struct schib schib;
 482
 483         if (stsch_err(schid, &schib))
 484                 /* We're through */
 485                 return -ENXIO;
 486         /* Put it on the slow path. */
 487         css_schedule_eval(schid);
 488         return 0;
 489 }
 490
 491 /**
 492  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 493  * @chpid: channl-path ID
 494  * @on: non-zero for vary online, zero for vary offline
 495  */
 496 int chsc_chp_vary(struct chp_id chpid, int on)
 497 {
 498         struct channel_path *chp = chpid_to_chp(chpid);
 499         struct chp_link link;
 500
 501         memset(&link, 0, sizeof(struct chp_link));
 502         link.chpid = chpid;
 503         /* Wait until previous actions have settled. */
 504         css_wait_for_slow_path();
 505         /*
 506          * Redo PathVerification on the devices the chpid connects to
 507          */
 508         if (on) {
 509                 /* Try to update the channel path descritor. */
 510                 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
 511                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 512                                            __s390_vary_chpid_on, &link);
 513         } else
 514                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 515                                            NULL, &link);
 516
 517         return 0;
 518 }
 519
 520 static void
 521 chsc_remove_cmg_attr(struct channel_subsystem *css)
 522 {
 523         int i;
 524
 525         for (i = 0; i <= __MAX_CHPID; i++) {
 526                 if (!css->chps[i])
 527                         continue;
 528                 chp_remove_cmg_attr(css->chps[i]);
 529         }
 530 }
 531
 532 static int
 533 chsc_add_cmg_attr(struct channel_subsystem *css)
 534 {
 535         int i, ret;
 536
 537         ret = 0;
 538         for (i = 0; i <= __MAX_CHPID; i++) {
 539                 if (!css->chps[i])
 540                         continue;
 541                 ret = chp_add_cmg_attr(css->chps[i]);
 542                 if (ret)
 543                         goto cleanup;
 544         }
 545         return ret;
 546 cleanup:
 547         for (--i; i >= 0; i--) {
 548                 if (!css->chps[i])
 549                         continue;
 550                 chp_remove_cmg_attr(css->chps[i]);
 551         }
 552         return ret;
 553 }
 554
 555 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 556 {
 557         struct {
 558                 struct chsc_header request;
 559                 u32 operation_code : 2;
 560                 u32 : 30;
 561                 u32 key : 4;
 562                 u32 : 28;
 563                 u32 zeroes1;
 564                 u32 cub_addr1;
 565                 u32 zeroes2;
 566                 u32 cub_addr2;
 567                 u32 reserved[13];
 568                 struct chsc_header response;
 569                 u32 status : 8;
 570                 u32 : 4;
 571                 u32 fmt : 4;
 572                 u32 : 16;
 573         } __attribute__ ((packed)) *secm_area;
 574         int ret, ccode;
 575
 576         spin_lock_irq(&chsc_page_lock);
 577         memset(chsc_page, 0, PAGE_SIZE);
 578         secm_area = chsc_page;
 579         secm_area->request.length = 0x0050;
 580         secm_area->request.code = 0x0016;
 581
 582         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 583         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 584         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 585
 586         secm_area->operation_code = enable ? 0 : 1;
 587
 588         ccode = chsc(secm_area);
 589         if (ccode > 0) {
 590                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 591                 goto out;
 592         }
 593
 594         switch (secm_area->response.code) {
 595         case 0x0102:
 596         case 0x0103:
 597                 ret = -EINVAL;
 598                 break;
 599         default:
 600                 ret = chsc_error_from_response(secm_area->response.code);
 601         }
 602         if (ret != 0)
 603                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 604                               secm_area->response.code);
 605 out:
 606         spin_unlock_irq(&chsc_page_lock);
 607         return ret;
 608 }
 609
 610 int
 611 chsc_secm(struct channel_subsystem *css, int enable)
 612 {
 613         int ret;
 614
 615         if (enable && !css->cm_enabled) {
 616                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 617                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 618                 if (!css->cub_addr1 || !css->cub_addr2) {
 619                         free_page((unsigned long)css->cub_addr1);
 620                         free_page((unsigned long)css->cub_addr2);
 621                         return -ENOMEM;
 622                 }
 623         }
 624         ret = __chsc_do_secm(css, enable);
 625         if (!ret) {
 626                 css->cm_enabled = enable;
 627                 if (css->cm_enabled) {
 628                         ret = chsc_add_cmg_attr(css);
 629                         if (ret) {
 630                                 __chsc_do_secm(css, 0);
 631                                 css->cm_enabled = 0;
 632                         }
 633                 } else
 634                         chsc_remove_cmg_attr(css);
 635         }
 636         if (!css->cm_enabled) {
 637                 free_page((unsigned long)css->cub_addr1);
 638                 free_page((unsigned long)css->cub_addr2);
 639         }
 640         return ret;
 641 }
 642
 643 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 644                                      int c, int m, void *page)
 645 {
 646         struct chsc_scpd *scpd_area;
 647         int ccode, ret;
 648
 649         if ((rfmt == 1) && !css_general_characteristics.fcs)
 650                 return -EINVAL;
 651         if ((rfmt == 2) && !css_general_characteristics.cib)
 652                 return -EINVAL;
 653
 654         memset(page, 0, PAGE_SIZE);
 655         scpd_area = page;
 656         scpd_area->request.length = 0x0010;
 657         scpd_area->request.code = 0x0002;
 658         scpd_area->cssid = chpid.cssid;
 659         scpd_area->first_chpid = chpid.id;
 660         scpd_area->last_chpid = chpid.id;
 661         scpd_area->m = m;
 662         scpd_area->c = c;
 663         scpd_area->fmt = fmt;
 664         scpd_area->rfmt = rfmt;
 665
 666         ccode = chsc(scpd_area);
 667         if (ccode > 0)
 668                 return (ccode == 3) ? -ENODEV : -EBUSY;
 669
 670         ret = chsc_error_from_response(scpd_area->response.code);
 671         if (ret)
 672                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 673                               scpd_area->response.code);
 674         return ret;
 675 }
 676 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 677
 678 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 679                                           struct channel_path_desc *desc)
 680 {
 681         struct chsc_response_struct *chsc_resp;
 682         struct chsc_scpd *scpd_area;
 683         unsigned long flags;
 684         int ret;
 685
 686         spin_lock_irqsave(&chsc_page_lock, flags);
 687         scpd_area = chsc_page;
 688         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 689         if (ret)
 690                 goto out;
 691         chsc_resp = (void *)&scpd_area->response;
 692         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 693 out:
 694         spin_unlock_irqrestore(&chsc_page_lock, flags);
 695         return ret;
 696 }
 697
 698 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 699                                           struct channel_path_desc_fmt1 *desc)
 700 {
 701         struct chsc_response_struct *chsc_resp;
 702         struct chsc_scpd *scpd_area;
 703         int ret;
 704
 705         spin_lock_irq(&chsc_page_lock);
 706         scpd_area = chsc_page;
 707         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
 708         if (ret)
 709                 goto out;
 710         chsc_resp = (void *)&scpd_area->response;
 711         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 712 out:
 713         spin_unlock_irq(&chsc_page_lock);
 714         return ret;
 715 }
 716
 717 static void
 718 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 719                           struct cmg_chars *chars)
 720 {
 721         struct cmg_chars *cmg_chars;
 722         int i, mask;
 723
 724         cmg_chars = chp->cmg_chars;
 725         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 726                 mask = 0x80 >> (i + 3);
 727                 if (cmcv & mask)
 728                         cmg_chars->values[i] = chars->values[i];
 729                 else
 730                         cmg_chars->values[i] = 0;
 731         }
 732 }
 733
 734 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 735 {
 736         struct cmg_chars *cmg_chars;
 737         int ccode, ret;
 738
 739         struct {
 740                 struct chsc_header request;
 741                 u32 : 24;
 742                 u32 first_chpid : 8;
 743                 u32 : 24;
 744                 u32 last_chpid : 8;
 745                 u32 zeroes1;
 746                 struct chsc_header response;
 747                 u32 zeroes2;
 748                 u32 not_valid : 1;
 749                 u32 shared : 1;
 750                 u32 : 22;
 751                 u32 chpid : 8;
 752                 u32 cmcv : 5;
 753                 u32 : 11;
 754                 u32 cmgq : 8;
 755                 u32 cmg : 8;
 756                 u32 zeroes3;
 757                 u32 data[NR_MEASUREMENT_CHARS];
 758         } __attribute__ ((packed)) *scmc_area;
 759
 760         chp->cmg_chars = NULL;
 761         cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
 762         if (!cmg_chars)
 763                 return -ENOMEM;
 764
 765         spin_lock_irq(&chsc_page_lock);
 766         memset(chsc_page, 0, PAGE_SIZE);
 767         scmc_area = chsc_page;
 768         scmc_area->request.length = 0x0010;
 769         scmc_area->request.code = 0x0022;
 770         scmc_area->first_chpid = chp->chpid.id;
 771         scmc_area->last_chpid = chp->chpid.id;
 772
 773         ccode = chsc(scmc_area);
 774         if (ccode > 0) {
 775                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 776                 goto out;
 777         }
 778
 779         ret = chsc_error_from_response(scmc_area->response.code);
 780         if (ret) {
 781                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 782                               scmc_area->response.code);
 783                 goto out;
 784         }
 785         if (scmc_area->not_valid) {
 786                 chp->cmg = -1;
 787                 chp->shared = -1;
 788                 goto out;
 789         }
 790         chp->cmg = scmc_area->cmg;
 791         chp->shared = scmc_area->shared;
 792         if (chp->cmg != 2 && chp->cmg != 3) {
 793                 /* No cmg-dependent data. */
 794                 goto out;
 795         }
 796         chp->cmg_chars = cmg_chars;
 797         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 798                                   (struct cmg_chars *) &scmc_area->data);
 799 out:
 800         spin_unlock_irq(&chsc_page_lock);
 801         if (!chp->cmg_chars)
 802                 kfree(cmg_chars);
 803
 804         return ret;
 805 }
 806
 807 int __init chsc_init(void)
 808 {
 809         int ret;
 810
 811         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 812         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 813         if (!sei_page || !chsc_page) {
 814                 ret = -ENOMEM;
 815                 goto out_err;
 816         }
 817         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
 818         if (ret)
 819                 goto out_err;
 820         return ret;
 821 out_err:
 822         free_page((unsigned long)chsc_page);
 823         free_page((unsigned long)sei_page);
 824         return ret;
 825 }
 826
 827 void __init chsc_init_cleanup(void)
 828 {
 829         crw_unregister_handler(CRW_RSC_CSS);
 830         free_page((unsigned long)chsc_page);
 831         free_page((unsigned long)sei_page);
 832 }
 833
 834 int chsc_enable_facility(int operation_code)
 835 {
 836         unsigned long flags;
 837         int ret;
 838         struct {
 839                 struct chsc_header request;
 840                 u8 reserved1:4;
 841                 u8 format:4;
 842                 u8 reserved2;
 843                 u16 operation_code;
 844                 u32 reserved3;
 845                 u32 reserved4;
 846                 u32 operation_data_area[252];
 847                 struct chsc_header response;
 848                 u32 reserved5:4;
 849                 u32 format2:4;
 850                 u32 reserved6:24;
 851         } __attribute__ ((packed)) *sda_area;
 852
 853         spin_lock_irqsave(&chsc_page_lock, flags);
 854         memset(chsc_page, 0, PAGE_SIZE);
 855         sda_area = chsc_page;
 856         sda_area->request.length = 0x0400;
 857         sda_area->request.code = 0x0031;
 858         sda_area->operation_code = operation_code;
 859
 860         ret = chsc(sda_area);
 861         if (ret > 0) {
 862                 ret = (ret == 3) ? -ENODEV : -EBUSY;
 863                 goto out;
 864         }
 865
 866         switch (sda_area->response.code) {
 867         case 0x0101:
 868                 ret = -EOPNOTSUPP;
 869                 break;
 870         default:
 871                 ret = chsc_error_from_response(sda_area->response.code);
 872         }
 873         if (ret != 0)
 874                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
 875                               operation_code, sda_area->response.code);
 876 out:
 877         spin_unlock_irqrestore(&chsc_page_lock, flags);
 878         return ret;
 879 }
 880
 881 struct css_general_char css_general_characteristics;
 882 struct css_chsc_char css_chsc_characteristics;
 883
 884 int __init
 885 chsc_determine_css_characteristics(void)
 886 {
 887         int result;
 888         struct {
 889                 struct chsc_header request;
 890                 u32 reserved1;
 891                 u32 reserved2;
 892                 u32 reserved3;
 893                 struct chsc_header response;
 894                 u32 reserved4;
 895                 u32 general_char[510];
 896                 u32 chsc_char[508];
 897         } __attribute__ ((packed)) *scsc_area;
 898
 899         spin_lock_irq(&chsc_page_lock);
 900         memset(chsc_page, 0, PAGE_SIZE);
 901         scsc_area = chsc_page;
 902         scsc_area->request.length = 0x0010;
 903         scsc_area->request.code = 0x0010;
 904
 905         result = chsc(scsc_area);
 906         if (result) {
 907                 result = (result == 3) ? -ENODEV : -EBUSY;
 908                 goto exit;
 909         }
 910
 911         result = chsc_error_from_response(scsc_area->response.code);
 912         if (result == 0) {
 913                 memcpy(&css_general_characteristics, scsc_area->general_char,
 914                        sizeof(css_general_characteristics));
 915                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
 916                        sizeof(css_chsc_characteristics));
 917         } else
 918                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
 919                               scsc_area->response.code);
 920 exit:
 921         spin_unlock_irq(&chsc_page_lock);
 922         return result;
 923 }
 924
 925 EXPORT_SYMBOL_GPL(css_general_characteristics);
 926 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
 927
 928 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
 929 {
 930         struct {
 931                 struct chsc_header request;
 932                 unsigned int rsvd0;
 933                 unsigned int op : 8;
 934                 unsigned int rsvd1 : 8;
 935                 unsigned int ctrl : 16;
 936                 unsigned int rsvd2[5];
 937                 struct chsc_header response;
 938                 unsigned int rsvd3[7];
 939         } __attribute__ ((packed)) *rr;
 940         int rc;
 941
 942         memset(page, 0, PAGE_SIZE);
 943         rr = page;
 944         rr->request.length = 0x0020;
 945         rr->request.code = 0x0033;
 946         rr->op = op;
 947         rr->ctrl = ctrl;
 948         rc = chsc(rr);
 949         if (rc)
 950                 return -EIO;
 951         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
 952         return rc;
 953 }
 954
 955 int chsc_sstpi(void *page, void *result, size_t size)
 956 {
 957         struct {
 958                 struct chsc_header request;
 959                 unsigned int rsvd0[3];
 960                 struct chsc_header response;
 961                 char data[size];
 962         } __attribute__ ((packed)) *rr;
 963         int rc;
 964
 965         memset(page, 0, PAGE_SIZE);
 966         rr = page;
 967         rr->request.length = 0x0010;
 968         rr->request.code = 0x0038;
 969         rc = chsc(rr);
 970         if (rc)
 971                 return -EIO;
 972         memcpy(result, &rr->data, size);
 973         return (rr->response.code == 0x0001) ? 0 : -EIO;
 974 }
 975
 976 int chsc_siosl(struct subchannel_id schid)
 977 {
 978         struct {
 979                 struct chsc_header request;
 980                 u32 word1;
 981                 struct subchannel_id sid;
 982                 u32 word3;
 983                 struct chsc_header response;
 984                 u32 word[11];
 985         } __attribute__ ((packed)) *siosl_area;
 986         unsigned long flags;
 987         int ccode;
 988         int rc;
 989
 990         spin_lock_irqsave(&chsc_page_lock, flags);
 991         memset(chsc_page, 0, PAGE_SIZE);
 992         siosl_area = chsc_page;
 993         siosl_area->request.length = 0x0010;
 994         siosl_area->request.code = 0x0046;
 995         siosl_area->word1 = 0x80000000;
 996         siosl_area->sid = schid;
 997
 998         ccode = chsc(siosl_area);
 999         if (ccode > 0) {
1000                 if (ccode == 3)
1001                         rc = -ENODEV;
1002                 else
1003                         rc = -EBUSY;
1004                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1005                               schid.ssid, schid.sch_no, ccode);
1006                 goto out;
1007         }
1008         rc = chsc_error_from_response(siosl_area->response.code);
1009         if (rc)
1010                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1011                               schid.ssid, schid.sch_no,
1012                               siosl_area->response.code);
1013         else
1014                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1015                               schid.ssid, schid.sch_no);
1016 out:
1017         spin_unlock_irqrestore(&chsc_page_lock, flags);
1018         return rc;
1019 }
1020 EXPORT_SYMBOL_GPL(chsc_siosl);