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. 1999,2008
   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 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/init.h>
  14 #include <linux/device.h>
  15
  16 #include <asm/cio.h>
  17 #include <asm/chpid.h>
  18 #include <asm/chsc.h>
  19
  20 #include "../s390mach.h"
  21 #include "css.h"
  22 #include "cio.h"
  23 #include "cio_debug.h"
  24 #include "ioasm.h"
  25 #include "chp.h"
  26 #include "chsc.h"
  27
  28 static void *sei_page;
  29
  30 /**
  31  * chsc_error_from_response() - convert a chsc response to an error
  32  * @response: chsc response code
  33  *
  34  * Returns an appropriate Linux error code for @response.
  35  */
  36 int chsc_error_from_response(int response)
  37 {
  38         switch (response) {
  39         case 0x0001:
  40                 return 0;
  41         case 0x0002:
  42         case 0x0003:
  43         case 0x0006:
  44         case 0x0007:
  45         case 0x0008:
  46         case 0x000a:
  47                 return -EINVAL;
  48         case 0x0004:
  49                 return -EOPNOTSUPP;
  50         default:
  51                 return -EIO;
  52         }
  53 }
  54 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  55
  56 struct chsc_ssd_area {
  57         struct chsc_header request;
  58         u16 :10;
  59         u16 ssid:2;
  60         u16 :4;
  61         u16 f_sch;        /* first subchannel */
  62         u16 :16;
  63         u16 l_sch;        /* last subchannel */
  64         u32 :32;
  65         struct chsc_header response;
  66         u32 :32;
  67         u8 sch_valid : 1;
  68         u8 dev_valid : 1;
  69         u8 st        : 3; /* subchannel type */
  70         u8 zeroes    : 3;
  71         u8  unit_addr;    /* unit address */
  72         u16 devno;        /* device number */
  73         u8 path_mask;
  74         u8 fla_valid_mask;
  75         u16 sch;          /* subchannel */
  76         u8 chpid[8];      /* chpids 0-7 */
  77         u16 fla[8];       /* full link addresses 0-7 */
  78 } __attribute__ ((packed));
  79
  80 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  81 {
  82         unsigned long page;
  83         struct chsc_ssd_area *ssd_area;
  84         int ccode;
  85         int ret;
  86         int i;
  87         int mask;
  88
  89         page = get_zeroed_page(GFP_KERNEL | GFP_DMA);
  90         if (!page)
  91                 return -ENOMEM;
  92         ssd_area = (struct chsc_ssd_area *) page;
  93         ssd_area->request.length = 0x0010;
  94         ssd_area->request.code = 0x0004;
  95         ssd_area->ssid = schid.ssid;
  96         ssd_area->f_sch = schid.sch_no;
  97         ssd_area->l_sch = schid.sch_no;
  98
  99         ccode = chsc(ssd_area);
 100         /* Check response. */
 101         if (ccode > 0) {
 102                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 103                 goto out_free;
 104         }
 105         ret = chsc_error_from_response(ssd_area->response.code);
 106         if (ret != 0) {
 107                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 108                               schid.ssid, schid.sch_no,
 109                               ssd_area->response.code);
 110                 goto out_free;
 111         }
 112         if (!ssd_area->sch_valid) {
 113                 ret = -ENODEV;
 114                 goto out_free;
 115         }
 116         /* Copy data */
 117         ret = 0;
 118         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 119         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 120             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 121                 goto out_free;
 122         ssd->path_mask = ssd_area->path_mask;
 123         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 124         for (i = 0; i < 8; i++) {
 125                 mask = 0x80 >> i;
 126                 if (ssd_area->path_mask & mask) {
 127                         chp_id_init(&ssd->chpid[i]);
 128                         ssd->chpid[i].id = ssd_area->chpid[i];
 129                 }
 130                 if (ssd_area->fla_valid_mask & mask)
 131                         ssd->fla[i] = ssd_area->fla[i];
 132         }
 133 out_free:
 134         free_page(page);
 135         return ret;
 136 }
 137
 138 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 139 {
 140         spin_lock_irq(sch->lock);
 141         if (sch->driver && sch->driver->chp_event)
 142                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 143                         goto out_unreg;
 144         spin_unlock_irq(sch->lock);
 145         return 0;
 146
 147 out_unreg:
 148         sch->lpm = 0;
 149         spin_unlock_irq(sch->lock);
 150         css_schedule_eval(sch->schid);
 151         return 0;
 152 }
 153
 154 void chsc_chp_offline(struct chp_id chpid)
 155 {
 156         char dbf_txt[15];
 157         struct chp_link link;
 158
 159         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 160         CIO_TRACE_EVENT(2, dbf_txt);
 161
 162         if (chp_get_status(chpid) <= 0)
 163                 return;
 164         memset(&link, 0, sizeof(struct chp_link));
 165         link.chpid = chpid;
 166         /* Wait until previous actions have settled. */
 167         css_wait_for_slow_path();
 168         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 169 }
 170
 171 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
 172 {
 173         struct schib schib;
 174         /*
 175          * We don't know the device yet, but since a path
 176          * may be available now to the device we'll have
 177          * to do recognition again.
 178          * Since we don't have any idea about which chpid
 179          * that beast may be on we'll have to do a stsch
 180          * on all devices, grr...
 181          */
 182         if (stsch_err(schid, &schib))
 183                 /* We're through */
 184                 return -ENXIO;
 185
 186         /* Put it on the slow path. */
 187         css_schedule_eval(schid);
 188         return 0;
 189 }
 190
 191 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 192 {
 193         spin_lock_irq(sch->lock);
 194         if (sch->driver && sch->driver->chp_event)
 195                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 196         spin_unlock_irq(sch->lock);
 197
 198         return 0;
 199 }
 200
 201 static void s390_process_res_acc(struct chp_link *link)
 202 {
 203         char dbf_txt[15];
 204
 205         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 206                 link->chpid.id);
 207         CIO_TRACE_EVENT( 2, dbf_txt);
 208         if (link->fla != 0) {
 209                 sprintf(dbf_txt, "fla%x", link->fla);
 210                 CIO_TRACE_EVENT( 2, dbf_txt);
 211         }
 212         /* Wait until previous actions have settled. */
 213         css_wait_for_slow_path();
 214         /*
 215          * I/O resources may have become accessible.
 216          * Scan through all subchannels that may be concerned and
 217          * do a validation on those.
 218          * The more information we have (info), the less scanning
 219          * will we have to do.
 220          */
 221         for_each_subchannel_staged(__s390_process_res_acc,
 222                                    s390_process_res_acc_new_sch, link);
 223 }
 224
 225 static int
 226 __get_chpid_from_lir(void *data)
 227 {
 228         struct lir {
 229                 u8  iq;
 230                 u8  ic;
 231                 u16 sci;
 232                 /* incident-node descriptor */
 233                 u32 indesc[28];
 234                 /* attached-node descriptor */
 235                 u32 andesc[28];
 236                 /* incident-specific information */
 237                 u32 isinfo[28];
 238         } __attribute__ ((packed)) *lir;
 239
 240         lir = data;
 241         if (!(lir->iq&0x80))
 242                 /* NULL link incident record */
 243                 return -EINVAL;
 244         if (!(lir->indesc[0]&0xc0000000))
 245                 /* node descriptor not valid */
 246                 return -EINVAL;
 247         if (!(lir->indesc[0]&0x10000000))
 248                 /* don't handle device-type nodes - FIXME */
 249                 return -EINVAL;
 250         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
 251
 252         return (u16) (lir->indesc[0]&0x000000ff);
 253 }
 254
 255 struct chsc_sei_area {
 256         struct chsc_header request;
 257         u32 reserved1;
 258         u32 reserved2;
 259         u32 reserved3;
 260         struct chsc_header response;
 261         u32 reserved4;
 262         u8  flags;
 263         u8  vf;         /* validity flags */
 264         u8  rs;         /* reporting source */
 265         u8  cc;         /* content code */
 266         u16 fla;        /* full link address */
 267         u16 rsid;       /* reporting source id */
 268         u32 reserved5;
 269         u32 reserved6;
 270         u8 ccdf[4096 - 16 - 24];        /* content-code dependent field */
 271         /* ccdf has to be big enough for a link-incident record */
 272 } __attribute__ ((packed));
 273
 274 static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
 275 {
 276         struct chp_id chpid;
 277         int id;
 278
 279         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
 280                       sei_area->rs, sei_area->rsid);
 281         if (sei_area->rs != 4)
 282                 return;
 283         id = __get_chpid_from_lir(sei_area->ccdf);
 284         if (id < 0)
 285                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
 286         else {
 287                 chp_id_init(&chpid);
 288                 chpid.id = id;
 289                 chsc_chp_offline(chpid);
 290         }
 291 }
 292
 293 static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
 294 {
 295         struct chp_link link;
 296         struct chp_id chpid;
 297         int status;
 298
 299         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 300                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 301         if (sei_area->rs != 4)
 302                 return;
 303         chp_id_init(&chpid);
 304         chpid.id = sei_area->rsid;
 305         /* allocate a new channel path structure, if needed */
 306         status = chp_get_status(chpid);
 307         if (status < 0)
 308                 chp_new(chpid);
 309         else if (!status)
 310                 return;
 311         memset(&link, 0, sizeof(struct chp_link));
 312         link.chpid = chpid;
 313         if ((sei_area->vf & 0xc0) != 0) {
 314                 link.fla = sei_area->fla;
 315                 if ((sei_area->vf & 0xc0) == 0xc0)
 316                         /* full link address */
 317                         link.fla_mask = 0xffff;
 318                 else
 319                         /* link address */
 320                         link.fla_mask = 0xff00;
 321         }
 322         s390_process_res_acc(&link);
 323 }
 324
 325 struct chp_config_data {
 326         u8 map[32];
 327         u8 op;
 328         u8 pc;
 329 };
 330
 331 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
 332 {
 333         struct chp_config_data *data;
 334         struct chp_id chpid;
 335         int num;
 336
 337         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 338         if (sei_area->rs != 0)
 339                 return;
 340         data = (struct chp_config_data *) &(sei_area->ccdf);
 341         chp_id_init(&chpid);
 342         for (num = 0; num <= __MAX_CHPID; num++) {
 343                 if (!chp_test_bit(data->map, num))
 344                         continue;
 345                 chpid.id = num;
 346                 printk(KERN_WARNING "cio: processing configure event %d for "
 347                        "chpid %x.%02x\n", data->op, chpid.cssid, chpid.id);
 348                 switch (data->op) {
 349                 case 0:
 350                         chp_cfg_schedule(chpid, 1);
 351                         break;
 352                 case 1:
 353                         chp_cfg_schedule(chpid, 0);
 354                         break;
 355                 case 2:
 356                         chp_cfg_cancel_deconfigure(chpid);
 357                         break;
 358                 }
 359         }
 360 }
 361
 362 static void chsc_process_sei(struct chsc_sei_area *sei_area)
 363 {
 364         /* Check if we might have lost some information. */
 365         if (sei_area->flags & 0x40) {
 366                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 367                 css_schedule_eval_all();
 368         }
 369         /* which kind of information was stored? */
 370         switch (sei_area->cc) {
 371         case 1: /* link incident*/
 372                 chsc_process_sei_link_incident(sei_area);
 373                 break;
 374         case 2: /* i/o resource accessibiliy */
 375                 chsc_process_sei_res_acc(sei_area);
 376                 break;
 377         case 8: /* channel-path-configuration notification */
 378                 chsc_process_sei_chp_config(sei_area);
 379                 break;
 380         default: /* other stuff */
 381                 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
 382                               sei_area->cc);
 383                 break;
 384         }
 385 }
 386
 387 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 388 {
 389         struct chsc_sei_area *sei_area;
 390
 391         if (overflow) {
 392                 css_schedule_eval_all();
 393                 return;
 394         }
 395         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 396                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 397                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 398                       crw0->erc, crw0->rsid);
 399         if (!sei_page)
 400                 return;
 401         /* Access to sei_page is serialized through machine check handler
 402          * thread, so no need for locking. */
 403         sei_area = sei_page;
 404
 405         CIO_TRACE_EVENT(2, "prcss");
 406         do {
 407                 memset(sei_area, 0, sizeof(*sei_area));
 408                 sei_area->request.length = 0x0010;
 409                 sei_area->request.code = 0x000e;
 410                 if (chsc(sei_area))
 411                         break;
 412
 413                 if (sei_area->response.code == 0x0001) {
 414                         CIO_CRW_EVENT(4, "chsc: sei successful\n");
 415                         chsc_process_sei(sei_area);
 416                 } else {
 417                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 418                                       sei_area->response.code);
 419                         break;
 420                 }
 421         } while (sei_area->flags & 0x80);
 422 }
 423
 424 void chsc_chp_online(struct chp_id chpid)
 425 {
 426         char dbf_txt[15];
 427         struct chp_link link;
 428
 429         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 430         CIO_TRACE_EVENT(2, dbf_txt);
 431
 432         if (chp_get_status(chpid) != 0) {
 433                 memset(&link, 0, sizeof(struct chp_link));
 434                 link.chpid = chpid;
 435                 /* Wait until previous actions have settled. */
 436                 css_wait_for_slow_path();
 437                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 438                                            &link);
 439         }
 440 }
 441
 442 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 443                                          struct chp_id chpid, int on)
 444 {
 445         unsigned long flags;
 446         struct chp_link link;
 447
 448         memset(&link, 0, sizeof(struct chp_link));
 449         link.chpid = chpid;
 450         spin_lock_irqsave(sch->lock, flags);
 451         if (sch->driver && sch->driver->chp_event)
 452                 sch->driver->chp_event(sch, &link,
 453                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 454         spin_unlock_irqrestore(sch->lock, flags);
 455 }
 456
 457 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 458 {
 459         struct chp_id *chpid = data;
 460
 461         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 462         return 0;
 463 }
 464
 465 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 466 {
 467         struct chp_id *chpid = data;
 468
 469         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 470         return 0;
 471 }
 472
 473 static int
 474 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 475 {
 476         struct schib schib;
 477
 478         if (stsch_err(schid, &schib))
 479                 /* We're through */
 480                 return -ENXIO;
 481         /* Put it on the slow path. */
 482         css_schedule_eval(schid);
 483         return 0;
 484 }
 485
 486 /**
 487  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 488  * @chpid: channl-path ID
 489  * @on: non-zero for vary online, zero for vary offline
 490  */
 491 int chsc_chp_vary(struct chp_id chpid, int on)
 492 {
 493         struct chp_link link;
 494
 495         memset(&link, 0, sizeof(struct chp_link));
 496         link.chpid = chpid;
 497         /* Wait until previous actions have settled. */
 498         css_wait_for_slow_path();
 499         /*
 500          * Redo PathVerification on the devices the chpid connects to
 501          */
 502
 503         if (on)
 504                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 505                                            __s390_vary_chpid_on, &link);
 506         else
 507                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 508                                            NULL, &link);
 509
 510         return 0;
 511 }
 512
 513 static void
 514 chsc_remove_cmg_attr(struct channel_subsystem *css)
 515 {
 516         int i;
 517
 518         for (i = 0; i <= __MAX_CHPID; i++) {
 519                 if (!css->chps[i])
 520                         continue;
 521                 chp_remove_cmg_attr(css->chps[i]);
 522         }
 523 }
 524
 525 static int
 526 chsc_add_cmg_attr(struct channel_subsystem *css)
 527 {
 528         int i, ret;
 529
 530         ret = 0;
 531         for (i = 0; i <= __MAX_CHPID; i++) {
 532                 if (!css->chps[i])
 533                         continue;
 534                 ret = chp_add_cmg_attr(css->chps[i]);
 535                 if (ret)
 536                         goto cleanup;
 537         }
 538         return ret;
 539 cleanup:
 540         for (--i; i >= 0; i--) {
 541                 if (!css->chps[i])
 542                         continue;
 543                 chp_remove_cmg_attr(css->chps[i]);
 544         }
 545         return ret;
 546 }
 547
 548 static int
 549 __chsc_do_secm(struct channel_subsystem *css, int enable, void *page)
 550 {
 551         struct {
 552                 struct chsc_header request;
 553                 u32 operation_code : 2;
 554                 u32 : 30;
 555                 u32 key : 4;
 556                 u32 : 28;
 557                 u32 zeroes1;
 558                 u32 cub_addr1;
 559                 u32 zeroes2;
 560                 u32 cub_addr2;
 561                 u32 reserved[13];
 562                 struct chsc_header response;
 563                 u32 status : 8;
 564                 u32 : 4;
 565                 u32 fmt : 4;
 566                 u32 : 16;
 567         } __attribute__ ((packed)) *secm_area;
 568         int ret, ccode;
 569
 570         secm_area = page;
 571         secm_area->request.length = 0x0050;
 572         secm_area->request.code = 0x0016;
 573
 574         secm_area->key = PAGE_DEFAULT_KEY;
 575         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 576         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 577
 578         secm_area->operation_code = enable ? 0 : 1;
 579
 580         ccode = chsc(secm_area);
 581         if (ccode > 0)
 582                 return (ccode == 3) ? -ENODEV : -EBUSY;
 583
 584         switch (secm_area->response.code) {
 585         case 0x0102:
 586         case 0x0103:
 587                 ret = -EINVAL;
 588         default:
 589                 ret = chsc_error_from_response(secm_area->response.code);
 590         }
 591         if (ret != 0)
 592                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 593                               secm_area->response.code);
 594         return ret;
 595 }
 596
 597 int
 598 chsc_secm(struct channel_subsystem *css, int enable)
 599 {
 600         void  *secm_area;
 601         int ret;
 602
 603         secm_area = (void *)get_zeroed_page(GFP_KERNEL |  GFP_DMA);
 604         if (!secm_area)
 605                 return -ENOMEM;
 606
 607         if (enable && !css->cm_enabled) {
 608                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 609                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 610                 if (!css->cub_addr1 || !css->cub_addr2) {
 611                         free_page((unsigned long)css->cub_addr1);
 612                         free_page((unsigned long)css->cub_addr2);
 613                         free_page((unsigned long)secm_area);
 614                         return -ENOMEM;
 615                 }
 616         }
 617         ret = __chsc_do_secm(css, enable, secm_area);
 618         if (!ret) {
 619                 css->cm_enabled = enable;
 620                 if (css->cm_enabled) {
 621                         ret = chsc_add_cmg_attr(css);
 622                         if (ret) {
 623                                 memset(secm_area, 0, PAGE_SIZE);
 624                                 __chsc_do_secm(css, 0, secm_area);
 625                                 css->cm_enabled = 0;
 626                         }
 627                 } else
 628                         chsc_remove_cmg_attr(css);
 629         }
 630         if (!css->cm_enabled) {
 631                 free_page((unsigned long)css->cub_addr1);
 632                 free_page((unsigned long)css->cub_addr2);
 633         }
 634         free_page((unsigned long)secm_area);
 635         return ret;
 636 }
 637
 638 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 639                                      int c, int m,
 640                                      struct chsc_response_struct *resp)
 641 {
 642         int ccode, ret;
 643
 644         struct {
 645                 struct chsc_header request;
 646                 u32 : 2;
 647                 u32 m : 1;
 648                 u32 c : 1;
 649                 u32 fmt : 4;
 650                 u32 cssid : 8;
 651                 u32 : 4;
 652                 u32 rfmt : 4;
 653                 u32 first_chpid : 8;
 654                 u32 : 24;
 655                 u32 last_chpid : 8;
 656                 u32 zeroes1;
 657                 struct chsc_header response;
 658                 u8 data[PAGE_SIZE - 20];
 659         } __attribute__ ((packed)) *scpd_area;
 660
 661         if ((rfmt == 1) && !css_general_characteristics.fcs)
 662                 return -EINVAL;
 663         if ((rfmt == 2) && !css_general_characteristics.cib)
 664                 return -EINVAL;
 665         scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 666         if (!scpd_area)
 667                 return -ENOMEM;
 668
 669         scpd_area->request.length = 0x0010;
 670         scpd_area->request.code = 0x0002;
 671
 672         scpd_area->cssid = chpid.cssid;
 673         scpd_area->first_chpid = chpid.id;
 674         scpd_area->last_chpid = chpid.id;
 675         scpd_area->m = m;
 676         scpd_area->c = c;
 677         scpd_area->fmt = fmt;
 678         scpd_area->rfmt = rfmt;
 679
 680         ccode = chsc(scpd_area);
 681         if (ccode > 0) {
 682                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 683                 goto out;
 684         }
 685
 686         ret = chsc_error_from_response(scpd_area->response.code);
 687         if (ret == 0)
 688                 /* Success. */
 689                 memcpy(resp, &scpd_area->response, scpd_area->response.length);
 690         else
 691                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 692                               scpd_area->response.code);
 693 out:
 694         free_page((unsigned long)scpd_area);
 695         return ret;
 696 }
 697 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 698
 699 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 700                                           struct channel_path_desc *desc)
 701 {
 702         struct chsc_response_struct *chsc_resp;
 703         int ret;
 704
 705         chsc_resp = kzalloc(sizeof(*chsc_resp), GFP_KERNEL);
 706         if (!chsc_resp)
 707                 return -ENOMEM;
 708         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, chsc_resp);
 709         if (ret)
 710                 goto out_free;
 711         memcpy(desc, &chsc_resp->data, chsc_resp->length);
 712 out_free:
 713         kfree(chsc_resp);
 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         switch (chp->cmg) {
 722         case 2:
 723         case 3:
 724                 chp->cmg_chars = kmalloc(sizeof(struct cmg_chars),
 725                                          GFP_KERNEL);
 726                 if (chp->cmg_chars) {
 727                         int i, mask;
 728                         struct cmg_chars *cmg_chars;
 729
 730                         cmg_chars = chp->cmg_chars;
 731                         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 732                                 mask = 0x80 >> (i + 3);
 733                                 if (cmcv & mask)
 734                                         cmg_chars->values[i] = chars->values[i];
 735                                 else
 736                                         cmg_chars->values[i] = 0;
 737                         }
 738                 }
 739                 break;
 740         default:
 741                 /* No cmg-dependent data. */
 742                 break;
 743         }
 744 }
 745
 746 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 747 {
 748         int ccode, ret;
 749
 750         struct {
 751                 struct chsc_header request;
 752                 u32 : 24;
 753                 u32 first_chpid : 8;
 754                 u32 : 24;
 755                 u32 last_chpid : 8;
 756                 u32 zeroes1;
 757                 struct chsc_header response;
 758                 u32 zeroes2;
 759                 u32 not_valid : 1;
 760                 u32 shared : 1;
 761                 u32 : 22;
 762                 u32 chpid : 8;
 763                 u32 cmcv : 5;
 764                 u32 : 11;
 765                 u32 cmgq : 8;
 766                 u32 cmg : 8;
 767                 u32 zeroes3;
 768                 u32 data[NR_MEASUREMENT_CHARS];
 769         } __attribute__ ((packed)) *scmc_area;
 770
 771         scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 772         if (!scmc_area)
 773                 return -ENOMEM;
 774
 775         scmc_area->request.length = 0x0010;
 776         scmc_area->request.code = 0x0022;
 777
 778         scmc_area->first_chpid = chp->chpid.id;
 779         scmc_area->last_chpid = chp->chpid.id;
 780
 781         ccode = chsc(scmc_area);
 782         if (ccode > 0) {
 783                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 784                 goto out;
 785         }
 786
 787         ret = chsc_error_from_response(scmc_area->response.code);
 788         if (ret == 0) {
 789                 /* Success. */
 790                 if (!scmc_area->not_valid) {
 791                         chp->cmg = scmc_area->cmg;
 792                         chp->shared = scmc_area->shared;
 793                         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 794                                                   (struct cmg_chars *)
 795                                                   &scmc_area->data);
 796                 } else {
 797                         chp->cmg = -1;
 798                         chp->shared = -1;
 799                 }
 800         } else {
 801                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 802                               scmc_area->response.code);
 803         }
 804 out:
 805         free_page((unsigned long)scmc_area);
 806         return ret;
 807 }
 808
 809 int __init chsc_alloc_sei_area(void)
 810 {
 811         int ret;
 812
 813         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 814         if (!sei_page) {
 815                 CIO_MSG_EVENT(0, "Can't allocate page for processing of "
 816                               "chsc machine checks!\n");
 817                 return -ENOMEM;
 818         }
 819         ret = s390_register_crw_handler(CRW_RSC_CSS, chsc_process_crw);
 820         if (ret)
 821                 kfree(sei_page);
 822         return ret;
 823 }
 824
 825 void __init chsc_free_sei_area(void)
 826 {
 827         s390_unregister_crw_handler(CRW_RSC_CSS);
 828         kfree(sei_page);
 829 }
 830
 831 int __init
 832 chsc_enable_facility(int operation_code)
 833 {
 834         int ret;
 835         struct {
 836                 struct chsc_header request;
 837                 u8 reserved1:4;
 838                 u8 format:4;
 839                 u8 reserved2;
 840                 u16 operation_code;
 841                 u32 reserved3;
 842                 u32 reserved4;
 843                 u32 operation_data_area[252];
 844                 struct chsc_header response;
 845                 u32 reserved5:4;
 846                 u32 format2:4;
 847                 u32 reserved6:24;
 848         } __attribute__ ((packed)) *sda_area;
 849
 850         sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
 851         if (!sda_area)
 852                 return -ENOMEM;
 853         sda_area->request.length = 0x0400;
 854         sda_area->request.code = 0x0031;
 855         sda_area->operation_code = operation_code;
 856
 857         ret = chsc(sda_area);
 858         if (ret > 0) {
 859                 ret = (ret == 3) ? -ENODEV : -EBUSY;
 860                 goto out;
 861         }
 862
 863         switch (sda_area->response.code) {
 864         case 0x0101:
 865                 ret = -EOPNOTSUPP;
 866                 break;
 867         default:
 868                 ret = chsc_error_from_response(sda_area->response.code);
 869         }
 870         if (ret != 0)
 871                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
 872                               operation_code, sda_area->response.code);
 873  out:
 874         free_page((unsigned long)sda_area);
 875         return ret;
 876 }
 877
 878 struct css_general_char css_general_characteristics;
 879 struct css_chsc_char css_chsc_characteristics;
 880
 881 int __init
 882 chsc_determine_css_characteristics(void)
 883 {
 884         int result;
 885         struct {
 886                 struct chsc_header request;
 887                 u32 reserved1;
 888                 u32 reserved2;
 889                 u32 reserved3;
 890                 struct chsc_header response;
 891                 u32 reserved4;
 892                 u32 general_char[510];
 893                 u32 chsc_char[518];
 894         } __attribute__ ((packed)) *scsc_area;
 895
 896         scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 897         if (!scsc_area)
 898                 return -ENOMEM;
 899
 900         scsc_area->request.length = 0x0010;
 901         scsc_area->request.code = 0x0010;
 902
 903         result = chsc(scsc_area);
 904         if (result) {
 905                 result = (result == 3) ? -ENODEV : -EBUSY;
 906                 goto exit;
 907         }
 908
 909         result = chsc_error_from_response(scsc_area->response.code);
 910         if (result == 0) {
 911                 memcpy(&css_general_characteristics, scsc_area->general_char,
 912                        sizeof(css_general_characteristics));
 913                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
 914                        sizeof(css_chsc_characteristics));
 915         } else
 916                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
 917                               scsc_area->response.code);
 918 exit:
 919         free_page ((unsigned long) scsc_area);
 920         return result;
 921 }
 922
 923 EXPORT_SYMBOL_GPL(css_general_characteristics);
 924 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
 925
 926 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
 927 {
 928         struct {
 929                 struct chsc_header request;
 930                 unsigned int rsvd0;
 931                 unsigned int op : 8;
 932                 unsigned int rsvd1 : 8;
 933                 unsigned int ctrl : 16;
 934                 unsigned int rsvd2[5];
 935                 struct chsc_header response;
 936                 unsigned int rsvd3[7];
 937         } __attribute__ ((packed)) *rr;
 938         int rc;
 939
 940         memset(page, 0, PAGE_SIZE);
 941         rr = page;
 942         rr->request.length = 0x0020;
 943         rr->request.code = 0x0033;
 944         rr->op = op;
 945         rr->ctrl = ctrl;
 946         rc = chsc(rr);
 947         if (rc)
 948                 return -EIO;
 949         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
 950         return rc;
 951 }
 952
 953 int chsc_sstpi(void *page, void *result, size_t size)
 954 {
 955         struct {
 956                 struct chsc_header request;
 957                 unsigned int rsvd0[3];
 958                 struct chsc_header response;
 959                 char data[size];
 960         } __attribute__ ((packed)) *rr;
 961         int rc;
 962
 963         memset(page, 0, PAGE_SIZE);
 964         rr = page;
 965         rr->request.length = 0x0010;
 966         rr->request.code = 0x0038;
 967         rc = chsc(rr);
 968         if (rc)
 969                 return -EIO;
 970         memcpy(result, &rr->data, size);
 971         return (rr->response.code == 0x0001) ? 0 : -EIO;
 972 }
 973