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 #include <asm/isc.h>
  24
  25 #include "css.h"
  26 #include "cio.h"
  27 #include "cio_debug.h"
  28 #include "ioasm.h"
  29 #include "chp.h"
  30 #include "chsc.h"
  31
  32 static void *sei_page;
  33 static void *chsc_page;
  34 static DEFINE_SPINLOCK(chsc_page_lock);
  35
  36 /**
  37  * chsc_error_from_response() - convert a chsc response to an error
  38  * @response: chsc response code
  39  *
  40  * Returns an appropriate Linux error code for @response.
  41  */
  42 int chsc_error_from_response(int response)
  43 {
  44         switch (response) {
  45         case 0x0001:
  46                 return 0;
  47         case 0x0002:
  48         case 0x0003:
  49         case 0x0006:
  50         case 0x0007:
  51         case 0x0008:
  52         case 0x000a:
  53         case 0x0104:
  54                 return -EINVAL;
  55         case 0x0004:
  56                 return -EOPNOTSUPP;
  57         case 0x000b:
  58                 return -EBUSY;
  59         case 0x0100:
  60         case 0x0102:
  61                 return -ENOMEM;
  62         default:
  63                 return -EIO;
  64         }
  65 }
  66 EXPORT_SYMBOL_GPL(chsc_error_from_response);
  67
  68 struct chsc_ssd_area {
  69         struct chsc_header request;
  70         u16 :10;
  71         u16 ssid:2;
  72         u16 :4;
  73         u16 f_sch;        /* first subchannel */
  74         u16 :16;
  75         u16 l_sch;        /* last subchannel */
  76         u32 :32;
  77         struct chsc_header response;
  78         u32 :32;
  79         u8 sch_valid : 1;
  80         u8 dev_valid : 1;
  81         u8 st        : 3; /* subchannel type */
  82         u8 zeroes    : 3;
  83         u8  unit_addr;    /* unit address */
  84         u16 devno;        /* device number */
  85         u8 path_mask;
  86         u8 fla_valid_mask;
  87         u16 sch;          /* subchannel */
  88         u8 chpid[8];      /* chpids 0-7 */
  89         u16 fla[8];       /* full link addresses 0-7 */
  90 } __attribute__ ((packed));
  91
  92 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
  93 {
  94         struct chsc_ssd_area *ssd_area;
  95         int ccode;
  96         int ret;
  97         int i;
  98         int mask;
  99
 100         spin_lock_irq(&chsc_page_lock);
 101         memset(chsc_page, 0, PAGE_SIZE);
 102         ssd_area = chsc_page;
 103         ssd_area->request.length = 0x0010;
 104         ssd_area->request.code = 0x0004;
 105         ssd_area->ssid = schid.ssid;
 106         ssd_area->f_sch = schid.sch_no;
 107         ssd_area->l_sch = schid.sch_no;
 108
 109         ccode = chsc(ssd_area);
 110         /* Check response. */
 111         if (ccode > 0) {
 112                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 113                 goto out;
 114         }
 115         ret = chsc_error_from_response(ssd_area->response.code);
 116         if (ret != 0) {
 117                 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
 118                               schid.ssid, schid.sch_no,
 119                               ssd_area->response.code);
 120                 goto out;
 121         }
 122         if (!ssd_area->sch_valid) {
 123                 ret = -ENODEV;
 124                 goto out;
 125         }
 126         /* Copy data */
 127         ret = 0;
 128         memset(ssd, 0, sizeof(struct chsc_ssd_info));
 129         if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
 130             (ssd_area->st != SUBCHANNEL_TYPE_MSG))
 131                 goto out;
 132         ssd->path_mask = ssd_area->path_mask;
 133         ssd->fla_valid_mask = ssd_area->fla_valid_mask;
 134         for (i = 0; i < 8; i++) {
 135                 mask = 0x80 >> i;
 136                 if (ssd_area->path_mask & mask) {
 137                         chp_id_init(&ssd->chpid[i]);
 138                         ssd->chpid[i].id = ssd_area->chpid[i];
 139                 }
 140                 if (ssd_area->fla_valid_mask & mask)
 141                         ssd->fla[i] = ssd_area->fla[i];
 142         }
 143 out:
 144         spin_unlock_irq(&chsc_page_lock);
 145         return ret;
 146 }
 147
 148 /**
 149  * chsc_ssqd() - store subchannel QDIO data (SSQD)
 150  * @schid: id of the subchannel on which SSQD is performed
 151  * @ssqd: request and response block for SSQD
 152  *
 153  * Returns 0 on success.
 154  */
 155 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
 156 {
 157         memset(ssqd, 0, sizeof(*ssqd));
 158         ssqd->request.length = 0x0010;
 159         ssqd->request.code = 0x0024;
 160         ssqd->first_sch = schid.sch_no;
 161         ssqd->last_sch = schid.sch_no;
 162         ssqd->ssid = schid.ssid;
 163
 164         if (chsc(ssqd))
 165                 return -EIO;
 166
 167         return chsc_error_from_response(ssqd->response.code);
 168 }
 169 EXPORT_SYMBOL_GPL(chsc_ssqd);
 170
 171 /**
 172  * chsc_sadc() - set adapter device controls (SADC)
 173  * @schid: id of the subchannel on which SADC is performed
 174  * @scssc: request and response block for SADC
 175  * @summary_indicator_addr: summary indicator address
 176  * @subchannel_indicator_addr: subchannel indicator address
 177  *
 178  * Returns 0 on success.
 179  */
 180 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
 181               u64 summary_indicator_addr, u64 subchannel_indicator_addr)
 182 {
 183         memset(scssc, 0, sizeof(*scssc));
 184         scssc->request.length = 0x0fe0;
 185         scssc->request.code = 0x0021;
 186         scssc->operation_code = 0;
 187
 188         scssc->summary_indicator_addr = summary_indicator_addr;
 189         scssc->subchannel_indicator_addr = subchannel_indicator_addr;
 190
 191         scssc->ks = PAGE_DEFAULT_KEY >> 4;
 192         scssc->kc = PAGE_DEFAULT_KEY >> 4;
 193         scssc->isc = QDIO_AIRQ_ISC;
 194         scssc->schid = schid;
 195
 196         /* enable the time delay disablement facility */
 197         if (css_general_characteristics.aif_tdd)
 198                 scssc->word_with_d_bit = 0x10000000;
 199
 200         if (chsc(scssc))
 201                 return -EIO;
 202
 203         return chsc_error_from_response(scssc->response.code);
 204 }
 205 EXPORT_SYMBOL_GPL(chsc_sadc);
 206
 207 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
 208 {
 209         spin_lock_irq(sch->lock);
 210         if (sch->driver && sch->driver->chp_event)
 211                 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
 212                         goto out_unreg;
 213         spin_unlock_irq(sch->lock);
 214         return 0;
 215
 216 out_unreg:
 217         sch->lpm = 0;
 218         spin_unlock_irq(sch->lock);
 219         css_schedule_eval(sch->schid);
 220         return 0;
 221 }
 222
 223 void chsc_chp_offline(struct chp_id chpid)
 224 {
 225         char dbf_txt[15];
 226         struct chp_link link;
 227
 228         sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
 229         CIO_TRACE_EVENT(2, dbf_txt);
 230
 231         if (chp_get_status(chpid) <= 0)
 232                 return;
 233         memset(&link, 0, sizeof(struct chp_link));
 234         link.chpid = chpid;
 235         /* Wait until previous actions have settled. */
 236         css_wait_for_slow_path();
 237         for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
 238 }
 239
 240 static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
 241 {
 242         struct schib schib;
 243         /*
 244          * We don't know the device yet, but since a path
 245          * may be available now to the device we'll have
 246          * to do recognition again.
 247          * Since we don't have any idea about which chpid
 248          * that beast may be on we'll have to do a stsch
 249          * on all devices, grr...
 250          */
 251         if (stsch_err(schid, &schib))
 252                 /* We're through */
 253                 return -ENXIO;
 254
 255         /* Put it on the slow path. */
 256         css_schedule_eval(schid);
 257         return 0;
 258 }
 259
 260 static int __s390_process_res_acc(struct subchannel *sch, void *data)
 261 {
 262         spin_lock_irq(sch->lock);
 263         if (sch->driver && sch->driver->chp_event)
 264                 sch->driver->chp_event(sch, data, CHP_ONLINE);
 265         spin_unlock_irq(sch->lock);
 266
 267         return 0;
 268 }
 269
 270 static void s390_process_res_acc(struct chp_link *link)
 271 {
 272         char dbf_txt[15];
 273
 274         sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
 275                 link->chpid.id);
 276         CIO_TRACE_EVENT( 2, dbf_txt);
 277         if (link->fla != 0) {
 278                 sprintf(dbf_txt, "fla%x", link->fla);
 279                 CIO_TRACE_EVENT( 2, dbf_txt);
 280         }
 281         /* Wait until previous actions have settled. */
 282         css_wait_for_slow_path();
 283         /*
 284          * I/O resources may have become accessible.
 285          * Scan through all subchannels that may be concerned and
 286          * do a validation on those.
 287          * The more information we have (info), the less scanning
 288          * will we have to do.
 289          */
 290         for_each_subchannel_staged(__s390_process_res_acc,
 291                                    s390_process_res_acc_new_sch, link);
 292 }
 293
 294 static int
 295 __get_chpid_from_lir(void *data)
 296 {
 297         struct lir {
 298                 u8  iq;
 299                 u8  ic;
 300                 u16 sci;
 301                 /* incident-node descriptor */
 302                 u32 indesc[28];
 303                 /* attached-node descriptor */
 304                 u32 andesc[28];
 305                 /* incident-specific information */
 306                 u32 isinfo[28];
 307         } __attribute__ ((packed)) *lir;
 308
 309         lir = data;
 310         if (!(lir->iq&0x80))
 311                 /* NULL link incident record */
 312                 return -EINVAL;
 313         if (!(lir->indesc[0]&0xc0000000))
 314                 /* node descriptor not valid */
 315                 return -EINVAL;
 316         if (!(lir->indesc[0]&0x10000000))
 317                 /* don't handle device-type nodes - FIXME */
 318                 return -EINVAL;
 319         /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
 320
 321         return (u16) (lir->indesc[0]&0x000000ff);
 322 }
 323
 324 struct chsc_sei_nt0_area {
 325         u8  flags;
 326         u8  vf;                         /* validity flags */
 327         u8  rs;                         /* reporting source */
 328         u8  cc;                         /* content code */
 329         u16 fla;                        /* full link address */
 330         u16 rsid;                       /* reporting source id */
 331         u32 reserved1;
 332         u32 reserved2;
 333         /* ccdf has to be big enough for a link-incident record */
 334         u8  ccdf[PAGE_SIZE - 24 - 16];  /* content-code dependent field */
 335 } __packed;
 336
 337 struct chsc_sei_nt2_area {
 338         u8  flags;                      /* p and v bit */
 339         u8  reserved1;
 340         u8  reserved2;
 341         u8  cc;                         /* content code */
 342         u32 reserved3[13];
 343         u8  ccdf[PAGE_SIZE - 24 - 56];  /* content-code dependent field */
 344 } __packed;
 345
 346 #define CHSC_SEI_NT0    (1ULL << 63)
 347 #define CHSC_SEI_NT2    (1ULL << 61)
 348
 349 struct chsc_sei {
 350         struct chsc_header request;
 351         u32 reserved1;
 352         u64 ntsm;                       /* notification type mask */
 353         struct chsc_header response;
 354         u32 :24;
 355         u8 nt;
 356         union {
 357                 struct chsc_sei_nt0_area nt0_area;
 358                 struct chsc_sei_nt2_area nt2_area;
 359                 u8 nt_area[PAGE_SIZE - 24];
 360         } u;
 361 } __packed;
 362
 363 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
 364 {
 365         struct chp_id chpid;
 366         int id;
 367
 368         CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
 369                       sei_area->rs, sei_area->rsid);
 370         if (sei_area->rs != 4)
 371                 return;
 372         id = __get_chpid_from_lir(sei_area->ccdf);
 373         if (id < 0)
 374                 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
 375         else {
 376                 chp_id_init(&chpid);
 377                 chpid.id = id;
 378                 chsc_chp_offline(chpid);
 379         }
 380 }
 381
 382 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
 383 {
 384         struct chp_link link;
 385         struct chp_id chpid;
 386         int status;
 387
 388         CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
 389                       "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
 390         if (sei_area->rs != 4)
 391                 return;
 392         chp_id_init(&chpid);
 393         chpid.id = sei_area->rsid;
 394         /* allocate a new channel path structure, if needed */
 395         status = chp_get_status(chpid);
 396         if (status < 0)
 397                 chp_new(chpid);
 398         else if (!status)
 399                 return;
 400         memset(&link, 0, sizeof(struct chp_link));
 401         link.chpid = chpid;
 402         if ((sei_area->vf & 0xc0) != 0) {
 403                 link.fla = sei_area->fla;
 404                 if ((sei_area->vf & 0xc0) == 0xc0)
 405                         /* full link address */
 406                         link.fla_mask = 0xffff;
 407                 else
 408                         /* link address */
 409                         link.fla_mask = 0xff00;
 410         }
 411         s390_process_res_acc(&link);
 412 }
 413
 414 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
 415 {
 416         struct channel_path *chp;
 417         struct chp_id chpid;
 418         u8 *data;
 419         int num;
 420
 421         CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
 422         if (sei_area->rs != 0)
 423                 return;
 424         data = sei_area->ccdf;
 425         chp_id_init(&chpid);
 426         for (num = 0; num <= __MAX_CHPID; num++) {
 427                 if (!chp_test_bit(data, num))
 428                         continue;
 429                 chpid.id = num;
 430
 431                 CIO_CRW_EVENT(4, "Update information for channel path "
 432                               "%x.%02x\n", chpid.cssid, chpid.id);
 433                 chp = chpid_to_chp(chpid);
 434                 if (!chp) {
 435                         chp_new(chpid);
 436                         continue;
 437                 }
 438                 mutex_lock(&chp->lock);
 439                 chp_update_desc(chp);
 440                 mutex_unlock(&chp->lock);
 441         }
 442 }
 443
 444 struct chp_config_data {
 445         u8 map[32];
 446         u8 op;
 447         u8 pc;
 448 };
 449
 450 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
 451 {
 452         struct chp_config_data *data;
 453         struct chp_id chpid;
 454         int num;
 455         char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
 456
 457         CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
 458         if (sei_area->rs != 0)
 459                 return;
 460         data = (struct chp_config_data *) &(sei_area->ccdf);
 461         chp_id_init(&chpid);
 462         for (num = 0; num <= __MAX_CHPID; num++) {
 463                 if (!chp_test_bit(data->map, num))
 464                         continue;
 465                 chpid.id = num;
 466                 pr_notice("Processing %s for channel path %x.%02x\n",
 467                           events[data->op], chpid.cssid, chpid.id);
 468                 switch (data->op) {
 469                 case 0:
 470                         chp_cfg_schedule(chpid, 1);
 471                         break;
 472                 case 1:
 473                         chp_cfg_schedule(chpid, 0);
 474                         break;
 475                 case 2:
 476                         chp_cfg_cancel_deconfigure(chpid);
 477                         break;
 478                 }
 479         }
 480 }
 481
 482 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
 483 {
 484         int ret;
 485
 486         CIO_CRW_EVENT(4, "chsc: scm change notification\n");
 487         if (sei_area->rs != 7)
 488                 return;
 489
 490         ret = scm_update_information();
 491         if (ret)
 492                 CIO_CRW_EVENT(0, "chsc: updating change notification"
 493                               " failed (rc=%d).\n", ret);
 494 }
 495
 496 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
 497 {
 498         int ret;
 499
 500         CIO_CRW_EVENT(4, "chsc: scm available information\n");
 501         if (sei_area->rs != 7)
 502                 return;
 503
 504         ret = scm_process_availability_information();
 505         if (ret)
 506                 CIO_CRW_EVENT(0, "chsc: process availability information"
 507                               " failed (rc=%d).\n", ret);
 508 }
 509
 510 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 511 {
 512         switch (sei_area->cc) {
 513         case 1:
 514                 zpci_event_error(sei_area->ccdf);
 515                 break;
 516         case 2:
 517                 zpci_event_availability(sei_area->ccdf);
 518                 break;
 519         default:
 520                 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
 521                               sei_area->cc);
 522                 break;
 523         }
 524 }
 525
 526 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 527 {
 528         /* which kind of information was stored? */
 529         switch (sei_area->cc) {
 530         case 1: /* link incident*/
 531                 chsc_process_sei_link_incident(sei_area);
 532                 break;
 533         case 2: /* i/o resource accessibility */
 534                 chsc_process_sei_res_acc(sei_area);
 535                 break;
 536         case 7: /* channel-path-availability information */
 537                 chsc_process_sei_chp_avail(sei_area);
 538                 break;
 539         case 8: /* channel-path-configuration notification */
 540                 chsc_process_sei_chp_config(sei_area);
 541                 break;
 542         case 12: /* scm change notification */
 543                 chsc_process_sei_scm_change(sei_area);
 544                 break;
 545         case 14: /* scm available notification */
 546                 chsc_process_sei_scm_avail(sei_area);
 547                 break;
 548         default: /* other stuff */
 549                 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 550                               sei_area->cc);
 551                 break;
 552         }
 553
 554         /* Check if we might have lost some information. */
 555         if (sei_area->flags & 0x40) {
 556                 CIO_CRW_EVENT(2, "chsc: event overflow\n");
 557                 css_schedule_eval_all();
 558         }
 559 }
 560
 561 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 562 {
 563         do {
 564                 memset(sei, 0, sizeof(*sei));
 565                 sei->request.length = 0x0010;
 566                 sei->request.code = 0x000e;
 567                 sei->ntsm = ntsm;
 568
 569                 if (chsc(sei))
 570                         break;
 571
 572                 if (sei->response.code != 0x0001) {
 573                         CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
 574                                       sei->response.code);
 575                         break;
 576                 }
 577
 578                 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
 579                 switch (sei->nt) {
 580                 case 0:
 581                         chsc_process_sei_nt0(&sei->u.nt0_area);
 582                         break;
 583                 case 2:
 584                         chsc_process_sei_nt2(&sei->u.nt2_area);
 585                         break;
 586                 default:
 587                         CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 588                         break;
 589                 }
 590         } while (sei->u.nt0_area.flags & 0x80);
 591 }
 592
 593 /*
 594  * Handle channel subsystem related CRWs.
 595  * Use store event information to find out what's going on.
 596  *
 597  * Note: Access to sei_page is serialized through machine check handler
 598  * thread, so no need for locking.
 599  */
 600 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
 601 {
 602         struct chsc_sei *sei = sei_page;
 603
 604         if (overflow) {
 605                 css_schedule_eval_all();
 606                 return;
 607         }
 608         CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
 609                       "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
 610                       crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
 611                       crw0->erc, crw0->rsid);
 612
 613         CIO_TRACE_EVENT(2, "prcss");
 614         chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
 615 }
 616
 617 void chsc_chp_online(struct chp_id chpid)
 618 {
 619         char dbf_txt[15];
 620         struct chp_link link;
 621
 622         sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
 623         CIO_TRACE_EVENT(2, dbf_txt);
 624
 625         if (chp_get_status(chpid) != 0) {
 626                 memset(&link, 0, sizeof(struct chp_link));
 627                 link.chpid = chpid;
 628                 /* Wait until previous actions have settled. */
 629                 css_wait_for_slow_path();
 630                 for_each_subchannel_staged(__s390_process_res_acc, NULL,
 631                                            &link);
 632         }
 633 }
 634
 635 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
 636                                          struct chp_id chpid, int on)
 637 {
 638         unsigned long flags;
 639         struct chp_link link;
 640
 641         memset(&link, 0, sizeof(struct chp_link));
 642         link.chpid = chpid;
 643         spin_lock_irqsave(sch->lock, flags);
 644         if (sch->driver && sch->driver->chp_event)
 645                 sch->driver->chp_event(sch, &link,
 646                                        on ? CHP_VARY_ON : CHP_VARY_OFF);
 647         spin_unlock_irqrestore(sch->lock, flags);
 648 }
 649
 650 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
 651 {
 652         struct chp_id *chpid = data;
 653
 654         __s390_subchannel_vary_chpid(sch, *chpid, 0);
 655         return 0;
 656 }
 657
 658 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
 659 {
 660         struct chp_id *chpid = data;
 661
 662         __s390_subchannel_vary_chpid(sch, *chpid, 1);
 663         return 0;
 664 }
 665
 666 static int
 667 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
 668 {
 669         struct schib schib;
 670
 671         if (stsch_err(schid, &schib))
 672                 /* We're through */
 673                 return -ENXIO;
 674         /* Put it on the slow path. */
 675         css_schedule_eval(schid);
 676         return 0;
 677 }
 678
 679 /**
 680  * chsc_chp_vary - propagate channel-path vary operation to subchannels
 681  * @chpid: channl-path ID
 682  * @on: non-zero for vary online, zero for vary offline
 683  */
 684 int chsc_chp_vary(struct chp_id chpid, int on)
 685 {
 686         struct channel_path *chp = chpid_to_chp(chpid);
 687
 688         /* Wait until previous actions have settled. */
 689         css_wait_for_slow_path();
 690         /*
 691          * Redo PathVerification on the devices the chpid connects to
 692          */
 693         if (on) {
 694                 /* Try to update the channel path description. */
 695                 chp_update_desc(chp);
 696                 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
 697                                            __s390_vary_chpid_on, &chpid);
 698         } else
 699                 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
 700                                            NULL, &chpid);
 701
 702         return 0;
 703 }
 704
 705 static void
 706 chsc_remove_cmg_attr(struct channel_subsystem *css)
 707 {
 708         int i;
 709
 710         for (i = 0; i <= __MAX_CHPID; i++) {
 711                 if (!css->chps[i])
 712                         continue;
 713                 chp_remove_cmg_attr(css->chps[i]);
 714         }
 715 }
 716
 717 static int
 718 chsc_add_cmg_attr(struct channel_subsystem *css)
 719 {
 720         int i, ret;
 721
 722         ret = 0;
 723         for (i = 0; i <= __MAX_CHPID; i++) {
 724                 if (!css->chps[i])
 725                         continue;
 726                 ret = chp_add_cmg_attr(css->chps[i]);
 727                 if (ret)
 728                         goto cleanup;
 729         }
 730         return ret;
 731 cleanup:
 732         for (--i; i >= 0; i--) {
 733                 if (!css->chps[i])
 734                         continue;
 735                 chp_remove_cmg_attr(css->chps[i]);
 736         }
 737         return ret;
 738 }
 739
 740 int __chsc_do_secm(struct channel_subsystem *css, int enable)
 741 {
 742         struct {
 743                 struct chsc_header request;
 744                 u32 operation_code : 2;
 745                 u32 : 30;
 746                 u32 key : 4;
 747                 u32 : 28;
 748                 u32 zeroes1;
 749                 u32 cub_addr1;
 750                 u32 zeroes2;
 751                 u32 cub_addr2;
 752                 u32 reserved[13];
 753                 struct chsc_header response;
 754                 u32 status : 8;
 755                 u32 : 4;
 756                 u32 fmt : 4;
 757                 u32 : 16;
 758         } __attribute__ ((packed)) *secm_area;
 759         int ret, ccode;
 760
 761         spin_lock_irq(&chsc_page_lock);
 762         memset(chsc_page, 0, PAGE_SIZE);
 763         secm_area = chsc_page;
 764         secm_area->request.length = 0x0050;
 765         secm_area->request.code = 0x0016;
 766
 767         secm_area->key = PAGE_DEFAULT_KEY >> 4;
 768         secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
 769         secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
 770
 771         secm_area->operation_code = enable ? 0 : 1;
 772
 773         ccode = chsc(secm_area);
 774         if (ccode > 0) {
 775                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 776                 goto out;
 777         }
 778
 779         switch (secm_area->response.code) {
 780         case 0x0102:
 781         case 0x0103:
 782                 ret = -EINVAL;
 783                 break;
 784         default:
 785                 ret = chsc_error_from_response(secm_area->response.code);
 786         }
 787         if (ret != 0)
 788                 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
 789                               secm_area->response.code);
 790 out:
 791         spin_unlock_irq(&chsc_page_lock);
 792         return ret;
 793 }
 794
 795 int
 796 chsc_secm(struct channel_subsystem *css, int enable)
 797 {
 798         int ret;
 799
 800         if (enable && !css->cm_enabled) {
 801                 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 802                 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 803                 if (!css->cub_addr1 || !css->cub_addr2) {
 804                         free_page((unsigned long)css->cub_addr1);
 805                         free_page((unsigned long)css->cub_addr2);
 806                         return -ENOMEM;
 807                 }
 808         }
 809         ret = __chsc_do_secm(css, enable);
 810         if (!ret) {
 811                 css->cm_enabled = enable;
 812                 if (css->cm_enabled) {
 813                         ret = chsc_add_cmg_attr(css);
 814                         if (ret) {
 815                                 __chsc_do_secm(css, 0);
 816                                 css->cm_enabled = 0;
 817                         }
 818                 } else
 819                         chsc_remove_cmg_attr(css);
 820         }
 821         if (!css->cm_enabled) {
 822                 free_page((unsigned long)css->cub_addr1);
 823                 free_page((unsigned long)css->cub_addr2);
 824         }
 825         return ret;
 826 }
 827
 828 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
 829                                      int c, int m, void *page)
 830 {
 831         struct chsc_scpd *scpd_area;
 832         int ccode, ret;
 833
 834         if ((rfmt == 1) && !css_general_characteristics.fcs)
 835                 return -EINVAL;
 836         if ((rfmt == 2) && !css_general_characteristics.cib)
 837                 return -EINVAL;
 838
 839         memset(page, 0, PAGE_SIZE);
 840         scpd_area = page;
 841         scpd_area->request.length = 0x0010;
 842         scpd_area->request.code = 0x0002;
 843         scpd_area->cssid = chpid.cssid;
 844         scpd_area->first_chpid = chpid.id;
 845         scpd_area->last_chpid = chpid.id;
 846         scpd_area->m = m;
 847         scpd_area->c = c;
 848         scpd_area->fmt = fmt;
 849         scpd_area->rfmt = rfmt;
 850
 851         ccode = chsc(scpd_area);
 852         if (ccode > 0)
 853                 return (ccode == 3) ? -ENODEV : -EBUSY;
 854
 855         ret = chsc_error_from_response(scpd_area->response.code);
 856         if (ret)
 857                 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
 858                               scpd_area->response.code);
 859         return ret;
 860 }
 861 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
 862
 863 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 864                                           struct channel_path_desc *desc)
 865 {
 866         struct chsc_response_struct *chsc_resp;
 867         struct chsc_scpd *scpd_area;
 868         unsigned long flags;
 869         int ret;
 870
 871         spin_lock_irqsave(&chsc_page_lock, flags);
 872         scpd_area = chsc_page;
 873         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 874         if (ret)
 875                 goto out;
 876         chsc_resp = (void *)&scpd_area->response;
 877         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 878 out:
 879         spin_unlock_irqrestore(&chsc_page_lock, flags);
 880         return ret;
 881 }
 882
 883 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
 884                                           struct channel_path_desc_fmt1 *desc)
 885 {
 886         struct chsc_response_struct *chsc_resp;
 887         struct chsc_scpd *scpd_area;
 888         unsigned long flags;
 889         int ret;
 890
 891         spin_lock_irqsave(&chsc_page_lock, flags);
 892         scpd_area = chsc_page;
 893         ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
 894         if (ret)
 895                 goto out;
 896         chsc_resp = (void *)&scpd_area->response;
 897         memcpy(desc, &chsc_resp->data, sizeof(*desc));
 898 out:
 899         spin_unlock_irqrestore(&chsc_page_lock, flags);
 900         return ret;
 901 }
 902
 903 static void
 904 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
 905                           struct cmg_chars *chars)
 906 {
 907         struct cmg_chars *cmg_chars;
 908         int i, mask;
 909
 910         cmg_chars = chp->cmg_chars;
 911         for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
 912                 mask = 0x80 >> (i + 3);
 913                 if (cmcv & mask)
 914                         cmg_chars->values[i] = chars->values[i];
 915                 else
 916                         cmg_chars->values[i] = 0;
 917         }
 918 }
 919
 920 int chsc_get_channel_measurement_chars(struct channel_path *chp)
 921 {
 922         struct cmg_chars *cmg_chars;
 923         int ccode, ret;
 924
 925         struct {
 926                 struct chsc_header request;
 927                 u32 : 24;
 928                 u32 first_chpid : 8;
 929                 u32 : 24;
 930                 u32 last_chpid : 8;
 931                 u32 zeroes1;
 932                 struct chsc_header response;
 933                 u32 zeroes2;
 934                 u32 not_valid : 1;
 935                 u32 shared : 1;
 936                 u32 : 22;
 937                 u32 chpid : 8;
 938                 u32 cmcv : 5;
 939                 u32 : 11;
 940                 u32 cmgq : 8;
 941                 u32 cmg : 8;
 942                 u32 zeroes3;
 943                 u32 data[NR_MEASUREMENT_CHARS];
 944         } __attribute__ ((packed)) *scmc_area;
 945
 946         chp->cmg_chars = NULL;
 947         cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
 948         if (!cmg_chars)
 949                 return -ENOMEM;
 950
 951         spin_lock_irq(&chsc_page_lock);
 952         memset(chsc_page, 0, PAGE_SIZE);
 953         scmc_area = chsc_page;
 954         scmc_area->request.length = 0x0010;
 955         scmc_area->request.code = 0x0022;
 956         scmc_area->first_chpid = chp->chpid.id;
 957         scmc_area->last_chpid = chp->chpid.id;
 958
 959         ccode = chsc(scmc_area);
 960         if (ccode > 0) {
 961                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
 962                 goto out;
 963         }
 964
 965         ret = chsc_error_from_response(scmc_area->response.code);
 966         if (ret) {
 967                 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
 968                               scmc_area->response.code);
 969                 goto out;
 970         }
 971         if (scmc_area->not_valid) {
 972                 chp->cmg = -1;
 973                 chp->shared = -1;
 974                 goto out;
 975         }
 976         chp->cmg = scmc_area->cmg;
 977         chp->shared = scmc_area->shared;
 978         if (chp->cmg != 2 && chp->cmg != 3) {
 979                 /* No cmg-dependent data. */
 980                 goto out;
 981         }
 982         chp->cmg_chars = cmg_chars;
 983         chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 984                                   (struct cmg_chars *) &scmc_area->data);
 985 out:
 986         spin_unlock_irq(&chsc_page_lock);
 987         if (!chp->cmg_chars)
 988                 kfree(cmg_chars);
 989
 990         return ret;
 991 }
 992
 993 int __init chsc_init(void)
 994 {
 995         int ret;
 996
 997         sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 998         chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 999         if (!sei_page || !chsc_page) {
1000                 ret = -ENOMEM;
1001                 goto out_err;
1002         }
1003         ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1004         if (ret)
1005                 goto out_err;
1006         return ret;
1007 out_err:
1008         free_page((unsigned long)chsc_page);
1009         free_page((unsigned long)sei_page);
1010         return ret;
1011 }
1012
1013 void __init chsc_init_cleanup(void)
1014 {
1015         crw_unregister_handler(CRW_RSC_CSS);
1016         free_page((unsigned long)chsc_page);
1017         free_page((unsigned long)sei_page);
1018 }
1019
1020 int chsc_enable_facility(int operation_code)
1021 {
1022         unsigned long flags;
1023         int ret;
1024         struct {
1025                 struct chsc_header request;
1026                 u8 reserved1:4;
1027                 u8 format:4;
1028                 u8 reserved2;
1029                 u16 operation_code;
1030                 u32 reserved3;
1031                 u32 reserved4;
1032                 u32 operation_data_area[252];
1033                 struct chsc_header response;
1034                 u32 reserved5:4;
1035                 u32 format2:4;
1036                 u32 reserved6:24;
1037         } __attribute__ ((packed)) *sda_area;
1038
1039         spin_lock_irqsave(&chsc_page_lock, flags);
1040         memset(chsc_page, 0, PAGE_SIZE);
1041         sda_area = chsc_page;
1042         sda_area->request.length = 0x0400;
1043         sda_area->request.code = 0x0031;
1044         sda_area->operation_code = operation_code;
1045
1046         ret = chsc(sda_area);
1047         if (ret > 0) {
1048                 ret = (ret == 3) ? -ENODEV : -EBUSY;
1049                 goto out;
1050         }
1051
1052         switch (sda_area->response.code) {
1053         case 0x0101:
1054                 ret = -EOPNOTSUPP;
1055                 break;
1056         default:
1057                 ret = chsc_error_from_response(sda_area->response.code);
1058         }
1059         if (ret != 0)
1060                 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1061                               operation_code, sda_area->response.code);
1062 out:
1063         spin_unlock_irqrestore(&chsc_page_lock, flags);
1064         return ret;
1065 }
1066
1067 struct css_general_char css_general_characteristics;
1068 struct css_chsc_char css_chsc_characteristics;
1069
1070 int __init
1071 chsc_determine_css_characteristics(void)
1072 {
1073         int result;
1074         struct {
1075                 struct chsc_header request;
1076                 u32 reserved1;
1077                 u32 reserved2;
1078                 u32 reserved3;
1079                 struct chsc_header response;
1080                 u32 reserved4;
1081                 u32 general_char[510];
1082                 u32 chsc_char[508];
1083         } __attribute__ ((packed)) *scsc_area;
1084
1085         spin_lock_irq(&chsc_page_lock);
1086         memset(chsc_page, 0, PAGE_SIZE);
1087         scsc_area = chsc_page;
1088         scsc_area->request.length = 0x0010;
1089         scsc_area->request.code = 0x0010;
1090
1091         result = chsc(scsc_area);
1092         if (result) {
1093                 result = (result == 3) ? -ENODEV : -EBUSY;
1094                 goto exit;
1095         }
1096
1097         result = chsc_error_from_response(scsc_area->response.code);
1098         if (result == 0) {
1099                 memcpy(&css_general_characteristics, scsc_area->general_char,
1100                        sizeof(css_general_characteristics));
1101                 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1102                        sizeof(css_chsc_characteristics));
1103         } else
1104                 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1105                               scsc_area->response.code);
1106 exit:
1107         spin_unlock_irq(&chsc_page_lock);
1108         return result;
1109 }
1110
1111 EXPORT_SYMBOL_GPL(css_general_characteristics);
1112 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1113
1114 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
1115 {
1116         struct {
1117                 struct chsc_header request;
1118                 unsigned int rsvd0;
1119                 unsigned int op : 8;
1120                 unsigned int rsvd1 : 8;
1121                 unsigned int ctrl : 16;
1122                 unsigned int rsvd2[5];
1123                 struct chsc_header response;
1124                 unsigned int rsvd3[7];
1125         } __attribute__ ((packed)) *rr;
1126         int rc;
1127
1128         memset(page, 0, PAGE_SIZE);
1129         rr = page;
1130         rr->request.length = 0x0020;
1131         rr->request.code = 0x0033;
1132         rr->op = op;
1133         rr->ctrl = ctrl;
1134         rc = chsc(rr);
1135         if (rc)
1136                 return -EIO;
1137         rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1138         return rc;
1139 }
1140
1141 int chsc_sstpi(void *page, void *result, size_t size)
1142 {
1143         struct {
1144                 struct chsc_header request;
1145                 unsigned int rsvd0[3];
1146                 struct chsc_header response;
1147                 char data[size];
1148         } __attribute__ ((packed)) *rr;
1149         int rc;
1150
1151         memset(page, 0, PAGE_SIZE);
1152         rr = page;
1153         rr->request.length = 0x0010;
1154         rr->request.code = 0x0038;
1155         rc = chsc(rr);
1156         if (rc)
1157                 return -EIO;
1158         memcpy(result, &rr->data, size);
1159         return (rr->response.code == 0x0001) ? 0 : -EIO;
1160 }
1161
1162 int chsc_siosl(struct subchannel_id schid)
1163 {
1164         struct {
1165                 struct chsc_header request;
1166                 u32 word1;
1167                 struct subchannel_id sid;
1168                 u32 word3;
1169                 struct chsc_header response;
1170                 u32 word[11];
1171         } __attribute__ ((packed)) *siosl_area;
1172         unsigned long flags;
1173         int ccode;
1174         int rc;
1175
1176         spin_lock_irqsave(&chsc_page_lock, flags);
1177         memset(chsc_page, 0, PAGE_SIZE);
1178         siosl_area = chsc_page;
1179         siosl_area->request.length = 0x0010;
1180         siosl_area->request.code = 0x0046;
1181         siosl_area->word1 = 0x80000000;
1182         siosl_area->sid = schid;
1183
1184         ccode = chsc(siosl_area);
1185         if (ccode > 0) {
1186                 if (ccode == 3)
1187                         rc = -ENODEV;
1188                 else
1189                         rc = -EBUSY;
1190                 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1191                               schid.ssid, schid.sch_no, ccode);
1192                 goto out;
1193         }
1194         rc = chsc_error_from_response(siosl_area->response.code);
1195         if (rc)
1196                 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1197                               schid.ssid, schid.sch_no,
1198                               siosl_area->response.code);
1199         else
1200                 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1201                               schid.ssid, schid.sch_no);
1202 out:
1203         spin_unlock_irqrestore(&chsc_page_lock, flags);
1204         return rc;
1205 }
1206 EXPORT_SYMBOL_GPL(chsc_siosl);
1207
1208 /**
1209  * chsc_scm_info() - store SCM information (SSI)
1210  * @scm_area: request and response block for SSI
1211  * @token: continuation token
1212  *
1213  * Returns 0 on success.
1214  */
1215 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1216 {
1217         int ccode, ret;
1218
1219         memset(scm_area, 0, sizeof(*scm_area));
1220         scm_area->request.length = 0x0020;
1221         scm_area->request.code = 0x004C;
1222         scm_area->reqtok = token;
1223
1224         ccode = chsc(scm_area);
1225         if (ccode > 0) {
1226                 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1227                 goto out;
1228         }
1229         ret = chsc_error_from_response(scm_area->response.code);
1230         if (ret != 0)
1231                 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1232                               scm_area->response.code);
1233 out:
1234         return ret;
1235 }
1236 EXPORT_SYMBOL_GPL(chsc_scm_info);