drivers/s390/char/sclp_cmd.c

   1 /*
   2  * Copyright IBM Corp. 2007, 2009
   3  *
   4  * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
   5  *            Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
   6  */
   7
   8 #define KMSG_COMPONENT "sclp_cmd"
   9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  10
  11 #include <linux/completion.h>
  12 #include <linux/init.h>
  13 #include <linux/errno.h>
  14 #include <linux/err.h>
  15 #include <linux/slab.h>
  16 #include <linux/string.h>
  17 #include <linux/mm.h>
  18 #include <linux/mmzone.h>
  19 #include <linux/memory.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <asm/chpid.h>
  23 #include <asm/sclp.h>
  24 #include <asm/setup.h>
  25 #include <asm/ctl_reg.h>
  26
  27 #include "sclp.h"
  28
  29 #define SCLP_CMDW_READ_SCP_INFO         0x00020001
  30 #define SCLP_CMDW_READ_SCP_INFO_FORCED  0x00120001
  31
  32 struct read_info_sccb {
  33         struct  sccb_header header;     /* 0-7 */
  34         u16     rnmax;                  /* 8-9 */
  35         u8      rnsize;                 /* 10 */
  36         u8      _reserved0[24 - 11];    /* 11-15 */
  37         u8      loadparm[8];            /* 24-31 */
  38         u8      _reserved1[48 - 32];    /* 32-47 */
  39         u64     facilities;             /* 48-55 */
  40         u8      _reserved2[84 - 56];    /* 56-83 */
  41         u8      fac84;                  /* 84 */
  42         u8      fac85;                  /* 85 */
  43         u8      _reserved3[91 - 86];    /* 86-90 */
  44         u8      flags;                  /* 91 */
  45         u8      _reserved4[100 - 92];   /* 92-99 */
  46         u32     rnsize2;                /* 100-103 */
  47         u64     rnmax2;                 /* 104-111 */
  48         u8      _reserved5[4096 - 112]; /* 112-4095 */
  49 } __attribute__((packed, aligned(PAGE_SIZE)));
  50
  51 static struct read_info_sccb __initdata early_read_info_sccb;
  52 static int __initdata early_read_info_sccb_valid;
  53
  54 u64 sclp_facilities;
  55 static u8 sclp_fac84;
  56 static u8 sclp_fac85;
  57 static unsigned long long rzm;
  58 static unsigned long long rnmax;
  59
  60 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
  61 {
  62         int rc;
  63
  64         __ctl_set_bit(0, 9);
  65         rc = sclp_service_call(cmd, sccb);
  66         if (rc)
  67                 goto out;
  68         __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
  69                         PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
  70         local_irq_disable();
  71 out:
  72         /* Contents of the sccb might have changed. */
  73         barrier();
  74         __ctl_clear_bit(0, 9);
  75         return rc;
  76 }
  77
  78 static void __init sclp_read_info_early(void)
  79 {
  80         int rc;
  81         int i;
  82         struct read_info_sccb *sccb;
  83         sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
  84                                   SCLP_CMDW_READ_SCP_INFO};
  85
  86         sccb = &early_read_info_sccb;
  87         for (i = 0; i < ARRAY_SIZE(commands); i++) {
  88                 do {
  89                         memset(sccb, 0, sizeof(*sccb));
  90                         sccb->header.length = sizeof(*sccb);
  91                         sccb->header.function_code = 0x80;
  92                         sccb->header.control_mask[2] = 0x80;
  93                         rc = sclp_cmd_sync_early(commands[i], sccb);
  94                 } while (rc == -EBUSY);
  95
  96                 if (rc)
  97                         break;
  98                 if (sccb->header.response_code == 0x10) {
  99                         early_read_info_sccb_valid = 1;
 100                         break;
 101                 }
 102                 if (sccb->header.response_code != 0x1f0)
 103                         break;
 104         }
 105 }
 106
 107 void __init sclp_facilities_detect(void)
 108 {
 109         struct read_info_sccb *sccb;
 110
 111         sclp_read_info_early();
 112         if (!early_read_info_sccb_valid)
 113                 return;
 114
 115         sccb = &early_read_info_sccb;
 116         sclp_facilities = sccb->facilities;
 117         sclp_fac84 = sccb->fac84;
 118         sclp_fac85 = sccb->fac85;
 119         rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
 120         rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
 121         rzm <<= 20;
 122 }
 123
 124 unsigned long long sclp_get_rnmax(void)
 125 {
 126         return rnmax;
 127 }
 128
 129 unsigned long long sclp_get_rzm(void)
 130 {
 131         return rzm;
 132 }
 133
 134 u8 sclp_get_fac85(void)
 135 {
 136         return sclp_fac85;
 137 }
 138 EXPORT_SYMBOL_GPL(sclp_get_fac85);
 139
 140 /*
 141  * This function will be called after sclp_facilities_detect(), which gets
 142  * called from early.c code. Therefore the sccb should have valid contents.
 143  */
 144 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
 145 {
 146         struct read_info_sccb *sccb;
 147
 148         if (!early_read_info_sccb_valid)
 149                 return;
 150         sccb = &early_read_info_sccb;
 151         info->is_valid = 1;
 152         if (sccb->flags & 0x2)
 153                 info->has_dump = 1;
 154         memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
 155 }
 156
 157 static void sclp_sync_callback(struct sclp_req *req, void *data)
 158 {
 159         struct completion *completion = data;
 160
 161         complete(completion);
 162 }
 163
 164 static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
 165 {
 166         struct completion completion;
 167         struct sclp_req *request;
 168         int rc;
 169
 170         request = kzalloc(sizeof(*request), GFP_KERNEL);
 171         if (!request)
 172                 return -ENOMEM;
 173         request->command = cmd;
 174         request->sccb = sccb;
 175         request->status = SCLP_REQ_FILLED;
 176         request->callback = sclp_sync_callback;
 177         request->callback_data = &completion;
 178         init_completion(&completion);
 179
 180         /* Perform sclp request. */
 181         rc = sclp_add_request(request);
 182         if (rc)
 183                 goto out;
 184         wait_for_completion(&completion);
 185
 186         /* Check response. */
 187         if (request->status != SCLP_REQ_DONE) {
 188                 pr_warning("sync request failed (cmd=0x%08x, "
 189                            "status=0x%02x)\n", cmd, request->status);
 190                 rc = -EIO;
 191         }
 192 out:
 193         kfree(request);
 194         return rc;
 195 }
 196
 197 /*
 198  * CPU configuration related functions.
 199  */
 200
 201 #define SCLP_CMDW_READ_CPU_INFO         0x00010001
 202 #define SCLP_CMDW_CONFIGURE_CPU         0x00110001
 203 #define SCLP_CMDW_DECONFIGURE_CPU       0x00100001
 204
 205 struct read_cpu_info_sccb {
 206         struct  sccb_header header;
 207         u16     nr_configured;
 208         u16     offset_configured;
 209         u16     nr_standby;
 210         u16     offset_standby;
 211         u8      reserved[4096 - 16];
 212 } __attribute__((packed, aligned(PAGE_SIZE)));
 213
 214 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
 215                                struct read_cpu_info_sccb *sccb)
 216 {
 217         char *page = (char *) sccb;
 218
 219         memset(info, 0, sizeof(*info));
 220         info->configured = sccb->nr_configured;
 221         info->standby = sccb->nr_standby;
 222         info->combined = sccb->nr_configured + sccb->nr_standby;
 223         info->has_cpu_type = sclp_fac84 & 0x1;
 224         memcpy(&info->cpu, page + sccb->offset_configured,
 225                info->combined * sizeof(struct sclp_cpu_entry));
 226 }
 227
 228 int sclp_get_cpu_info(struct sclp_cpu_info *info)
 229 {
 230         int rc;
 231         struct read_cpu_info_sccb *sccb;
 232
 233         if (!SCLP_HAS_CPU_INFO)
 234                 return -EOPNOTSUPP;
 235         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 236         if (!sccb)
 237                 return -ENOMEM;
 238         sccb->header.length = sizeof(*sccb);
 239         rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
 240         if (rc)
 241                 goto out;
 242         if (sccb->header.response_code != 0x0010) {
 243                 pr_warning("readcpuinfo failed (response=0x%04x)\n",
 244                            sccb->header.response_code);
 245                 rc = -EIO;
 246                 goto out;
 247         }
 248         sclp_fill_cpu_info(info, sccb);
 249 out:
 250         free_page((unsigned long) sccb);
 251         return rc;
 252 }
 253
 254 struct cpu_configure_sccb {
 255         struct sccb_header header;
 256 } __attribute__((packed, aligned(8)));
 257
 258 static int do_cpu_configure(sclp_cmdw_t cmd)
 259 {
 260         struct cpu_configure_sccb *sccb;
 261         int rc;
 262
 263         if (!SCLP_HAS_CPU_RECONFIG)
 264                 return -EOPNOTSUPP;
 265         /*
 266          * This is not going to cross a page boundary since we force
 267          * kmalloc to have a minimum alignment of 8 bytes on s390.
 268          */
 269         sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
 270         if (!sccb)
 271                 return -ENOMEM;
 272         sccb->header.length = sizeof(*sccb);
 273         rc = do_sync_request(cmd, sccb);
 274         if (rc)
 275                 goto out;
 276         switch (sccb->header.response_code) {
 277         case 0x0020:
 278         case 0x0120:
 279                 break;
 280         default:
 281                 pr_warning("configure cpu failed (cmd=0x%08x, "
 282                            "response=0x%04x)\n", cmd,
 283                            sccb->header.response_code);
 284                 rc = -EIO;
 285                 break;
 286         }
 287 out:
 288         kfree(sccb);
 289         return rc;
 290 }
 291
 292 int sclp_cpu_configure(u8 cpu)
 293 {
 294         return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
 295 }
 296
 297 int sclp_cpu_deconfigure(u8 cpu)
 298 {
 299         return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
 300 }
 301
 302 #ifdef CONFIG_MEMORY_HOTPLUG
 303
 304 static DEFINE_MUTEX(sclp_mem_mutex);
 305 static LIST_HEAD(sclp_mem_list);
 306 static u8 sclp_max_storage_id;
 307 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
 308 static int sclp_mem_state_changed;
 309
 310 struct memory_increment {
 311         struct list_head list;
 312         u16 rn;
 313         int standby;
 314         int usecount;
 315 };
 316
 317 struct assign_storage_sccb {
 318         struct sccb_header header;
 319         u16 rn;
 320 } __packed;
 321
 322 int arch_get_memory_phys_device(unsigned long start_pfn)
 323 {
 324         if (!rzm)
 325                 return 0;
 326         return PFN_PHYS(start_pfn) >> ilog2(rzm);
 327 }
 328
 329 static unsigned long long rn2addr(u16 rn)
 330 {
 331         return (unsigned long long) (rn - 1) * rzm;
 332 }
 333
 334 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
 335 {
 336         struct assign_storage_sccb *sccb;
 337         int rc;
 338
 339         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 340         if (!sccb)
 341                 return -ENOMEM;
 342         sccb->header.length = PAGE_SIZE;
 343         sccb->rn = rn;
 344         rc = do_sync_request(cmd, sccb);
 345         if (rc)
 346                 goto out;
 347         switch (sccb->header.response_code) {
 348         case 0x0020:
 349         case 0x0120:
 350                 break;
 351         default:
 352                 pr_warning("assign storage failed (cmd=0x%08x, "
 353                            "response=0x%04x, rn=0x%04x)\n", cmd,
 354                            sccb->header.response_code, rn);
 355                 rc = -EIO;
 356                 break;
 357         }
 358 out:
 359         free_page((unsigned long) sccb);
 360         return rc;
 361 }
 362
 363 static int sclp_assign_storage(u16 rn)
 364 {
 365         unsigned long long start, address;
 366         int rc;
 367
 368         rc = do_assign_storage(0x000d0001, rn);
 369         if (rc)
 370                 goto out;
 371         start = address = rn2addr(rn);
 372         for (; address < start + rzm; address += PAGE_SIZE)
 373                 page_set_storage_key(address, PAGE_DEFAULT_KEY, 0);
 374 out:
 375         return rc;
 376 }
 377
 378 static int sclp_unassign_storage(u16 rn)
 379 {
 380         return do_assign_storage(0x000c0001, rn);
 381 }
 382
 383 struct attach_storage_sccb {
 384         struct sccb_header header;
 385         u16 :16;
 386         u16 assigned;
 387         u32 :32;
 388         u32 entries[0];
 389 } __packed;
 390
 391 static int sclp_attach_storage(u8 id)
 392 {
 393         struct attach_storage_sccb *sccb;
 394         int rc;
 395         int i;
 396
 397         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 398         if (!sccb)
 399                 return -ENOMEM;
 400         sccb->header.length = PAGE_SIZE;
 401         rc = do_sync_request(0x00080001 | id << 8, sccb);
 402         if (rc)
 403                 goto out;
 404         switch (sccb->header.response_code) {
 405         case 0x0020:
 406                 set_bit(id, sclp_storage_ids);
 407                 for (i = 0; i < sccb->assigned; i++) {
 408                         if (sccb->entries[i])
 409                                 sclp_unassign_storage(sccb->entries[i] >> 16);
 410                 }
 411                 break;
 412         default:
 413                 rc = -EIO;
 414                 break;
 415         }
 416 out:
 417         free_page((unsigned long) sccb);
 418         return rc;
 419 }
 420
 421 static int sclp_mem_change_state(unsigned long start, unsigned long size,
 422                                  int online)
 423 {
 424         struct memory_increment *incr;
 425         unsigned long long istart;
 426         int rc = 0;
 427
 428         list_for_each_entry(incr, &sclp_mem_list, list) {
 429                 istart = rn2addr(incr->rn);
 430                 if (start + size - 1 < istart)
 431                         break;
 432                 if (start > istart + rzm - 1)
 433                         continue;
 434                 if (online) {
 435                         if (incr->usecount++)
 436                                 continue;
 437                         /*
 438                          * Don't break the loop if one assign fails. Loop may
 439                          * be walked again on CANCEL and we can't save
 440                          * information if state changed before or not.
 441                          * So continue and increase usecount for all increments.
 442                          */
 443                         rc |= sclp_assign_storage(incr->rn);
 444                 } else {
 445                         if (--incr->usecount)
 446                                 continue;
 447                         sclp_unassign_storage(incr->rn);
 448                 }
 449         }
 450         return rc ? -EIO : 0;
 451 }
 452
 453 static int sclp_mem_notifier(struct notifier_block *nb,
 454                              unsigned long action, void *data)
 455 {
 456         unsigned long start, size;
 457         struct memory_notify *arg;
 458         unsigned char id;
 459         int rc = 0;
 460
 461         arg = data;
 462         start = arg->start_pfn << PAGE_SHIFT;
 463         size = arg->nr_pages << PAGE_SHIFT;
 464         mutex_lock(&sclp_mem_mutex);
 465         for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
 466                 sclp_attach_storage(id);
 467         switch (action) {
 468         case MEM_ONLINE:
 469         case MEM_GOING_OFFLINE:
 470         case MEM_CANCEL_OFFLINE:
 471                 break;
 472         case MEM_GOING_ONLINE:
 473                 rc = sclp_mem_change_state(start, size, 1);
 474                 break;
 475         case MEM_CANCEL_ONLINE:
 476                 sclp_mem_change_state(start, size, 0);
 477                 break;
 478         case MEM_OFFLINE:
 479                 sclp_mem_change_state(start, size, 0);
 480                 break;
 481         default:
 482                 rc = -EINVAL;
 483                 break;
 484         }
 485         if (!rc)
 486                 sclp_mem_state_changed = 1;
 487         mutex_unlock(&sclp_mem_mutex);
 488         return rc ? NOTIFY_BAD : NOTIFY_OK;
 489 }
 490
 491 static struct notifier_block sclp_mem_nb = {
 492         .notifier_call = sclp_mem_notifier,
 493 };
 494
 495 static void __init add_memory_merged(u16 rn)
 496 {
 497         static u16 first_rn, num;
 498         unsigned long long start, size;
 499
 500         if (rn && first_rn && (first_rn + num == rn)) {
 501                 num++;
 502                 return;
 503         }
 504         if (!first_rn)
 505                 goto skip_add;
 506         start = rn2addr(first_rn);
 507         size = (unsigned long long ) num * rzm;
 508         if (start >= VMEM_MAX_PHYS)
 509                 goto skip_add;
 510         if (start + size > VMEM_MAX_PHYS)
 511                 size = VMEM_MAX_PHYS - start;
 512         if (memory_end_set && (start >= memory_end))
 513                 goto skip_add;
 514         if (memory_end_set && (start + size > memory_end))
 515                 size = memory_end - start;
 516         add_memory(0, start, size);
 517 skip_add:
 518         first_rn = rn;
 519         num = 1;
 520 }
 521
 522 static void __init sclp_add_standby_memory(void)
 523 {
 524         struct memory_increment *incr;
 525
 526         list_for_each_entry(incr, &sclp_mem_list, list)
 527                 if (incr->standby)
 528                         add_memory_merged(incr->rn);
 529         add_memory_merged(0);
 530 }
 531
 532 static void __init insert_increment(u16 rn, int standby, int assigned)
 533 {
 534         struct memory_increment *incr, *new_incr;
 535         struct list_head *prev;
 536         u16 last_rn;
 537
 538         new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
 539         if (!new_incr)
 540                 return;
 541         new_incr->rn = rn;
 542         new_incr->standby = standby;
 543         if (!standby)
 544                 new_incr->usecount = 1;
 545         last_rn = 0;
 546         prev = &sclp_mem_list;
 547         list_for_each_entry(incr, &sclp_mem_list, list) {
 548                 if (assigned && incr->rn > rn)
 549                         break;
 550                 if (!assigned && incr->rn - last_rn > 1)
 551                         break;
 552                 last_rn = incr->rn;
 553                 prev = &incr->list;
 554         }
 555         if (!assigned)
 556                 new_incr->rn = last_rn + 1;
 557         if (new_incr->rn > rnmax) {
 558                 kfree(new_incr);
 559                 return;
 560         }
 561         list_add(&new_incr->list, prev);
 562 }
 563
 564 static int sclp_mem_freeze(struct device *dev)
 565 {
 566         if (!sclp_mem_state_changed)
 567                 return 0;
 568         pr_err("Memory hotplug state changed, suspend refused.\n");
 569         return -EPERM;
 570 }
 571
 572 struct read_storage_sccb {
 573         struct sccb_header header;
 574         u16 max_id;
 575         u16 assigned;
 576         u16 standby;
 577         u16 :16;
 578         u32 entries[0];
 579 } __packed;
 580
 581 static const struct dev_pm_ops sclp_mem_pm_ops = {
 582         .freeze         = sclp_mem_freeze,
 583 };
 584
 585 static struct platform_driver sclp_mem_pdrv = {
 586         .driver = {
 587                 .name   = "sclp_mem",
 588                 .pm     = &sclp_mem_pm_ops,
 589         },
 590 };
 591
 592 static int __init sclp_detect_standby_memory(void)
 593 {
 594         struct platform_device *sclp_pdev;
 595         struct read_storage_sccb *sccb;
 596         int i, id, assigned, rc;
 597
 598         if (!early_read_info_sccb_valid)
 599                 return 0;
 600         if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
 601                 return 0;
 602         rc = -ENOMEM;
 603         sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
 604         if (!sccb)
 605                 goto out;
 606         assigned = 0;
 607         for (id = 0; id <= sclp_max_storage_id; id++) {
 608                 memset(sccb, 0, PAGE_SIZE);
 609                 sccb->header.length = PAGE_SIZE;
 610                 rc = do_sync_request(0x00040001 | id << 8, sccb);
 611                 if (rc)
 612                         goto out;
 613                 switch (sccb->header.response_code) {
 614                 case 0x0010:
 615                         set_bit(id, sclp_storage_ids);
 616                         for (i = 0; i < sccb->assigned; i++) {
 617                                 if (!sccb->entries[i])
 618                                         continue;
 619                                 assigned++;
 620                                 insert_increment(sccb->entries[i] >> 16, 0, 1);
 621                         }
 622                         break;
 623                 case 0x0310:
 624                         break;
 625                 case 0x0410:
 626                         for (i = 0; i < sccb->assigned; i++) {
 627                                 if (!sccb->entries[i])
 628                                         continue;
 629                                 assigned++;
 630                                 insert_increment(sccb->entries[i] >> 16, 1, 1);
 631                         }
 632                         break;
 633                 default:
 634                         rc = -EIO;
 635                         break;
 636                 }
 637                 if (!rc)
 638                         sclp_max_storage_id = sccb->max_id;
 639         }
 640         if (rc || list_empty(&sclp_mem_list))
 641                 goto out;
 642         for (i = 1; i <= rnmax - assigned; i++)
 643                 insert_increment(0, 1, 0);
 644         rc = register_memory_notifier(&sclp_mem_nb);
 645         if (rc)
 646                 goto out;
 647         rc = platform_driver_register(&sclp_mem_pdrv);
 648         if (rc)
 649                 goto out;
 650         sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
 651         rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
 652         if (rc)
 653                 goto out_driver;
 654         sclp_add_standby_memory();
 655         goto out;
 656 out_driver:
 657         platform_driver_unregister(&sclp_mem_pdrv);
 658 out:
 659         free_page((unsigned long) sccb);
 660         return rc;
 661 }
 662 __initcall(sclp_detect_standby_memory);
 663
 664 #endif /* CONFIG_MEMORY_HOTPLUG */
 665
 666 /*
 667  * Channel path configuration related functions.
 668  */
 669
 670 #define SCLP_CMDW_CONFIGURE_CHPATH              0x000f0001
 671 #define SCLP_CMDW_DECONFIGURE_CHPATH            0x000e0001
 672 #define SCLP_CMDW_READ_CHPATH_INFORMATION       0x00030001
 673
 674 struct chp_cfg_sccb {
 675         struct sccb_header header;
 676         u8 ccm;
 677         u8 reserved[6];
 678         u8 cssid;
 679 } __attribute__((packed));
 680
 681 static int do_chp_configure(sclp_cmdw_t cmd)
 682 {
 683         struct chp_cfg_sccb *sccb;
 684         int rc;
 685
 686         if (!SCLP_HAS_CHP_RECONFIG)
 687                 return -EOPNOTSUPP;
 688         /* Prepare sccb. */
 689         sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 690         if (!sccb)
 691                 return -ENOMEM;
 692         sccb->header.length = sizeof(*sccb);
 693         rc = do_sync_request(cmd, sccb);
 694         if (rc)
 695                 goto out;
 696         switch (sccb->header.response_code) {
 697         case 0x0020:
 698         case 0x0120:
 699         case 0x0440:
 700         case 0x0450:
 701                 break;
 702         default:
 703                 pr_warning("configure channel-path failed "
 704                            "(cmd=0x%08x, response=0x%04x)\n", cmd,
 705                            sccb->header.response_code);
 706                 rc = -EIO;
 707                 break;
 708         }
 709 out:
 710         free_page((unsigned long) sccb);
 711         return rc;
 712 }
 713
 714 /**
 715  * sclp_chp_configure - perform configure channel-path sclp command
 716  * @chpid: channel-path ID
 717  *
 718  * Perform configure channel-path command sclp command for specified chpid.
 719  * Return 0 after command successfully finished, non-zero otherwise.
 720  */
 721 int sclp_chp_configure(struct chp_id chpid)
 722 {
 723         return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
 724 }
 725
 726 /**
 727  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
 728  * @chpid: channel-path ID
 729  *
 730  * Perform deconfigure channel-path command sclp command for specified chpid
 731  * and wait for completion. On success return 0. Return non-zero otherwise.
 732  */
 733 int sclp_chp_deconfigure(struct chp_id chpid)
 734 {
 735         return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
 736 }
 737
 738 struct chp_info_sccb {
 739         struct sccb_header header;
 740         u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
 741         u8 standby[SCLP_CHP_INFO_MASK_SIZE];
 742         u8 configured[SCLP_CHP_INFO_MASK_SIZE];
 743         u8 ccm;
 744         u8 reserved[6];
 745         u8 cssid;
 746 } __attribute__((packed));
 747
 748 /**
 749  * sclp_chp_read_info - perform read channel-path information sclp command
 750  * @info: resulting channel-path information data
 751  *
 752  * Perform read channel-path information sclp command and wait for completion.
 753  * On success, store channel-path information in @info and return 0. Return
 754  * non-zero otherwise.
 755  */
 756 int sclp_chp_read_info(struct sclp_chp_info *info)
 757 {
 758         struct chp_info_sccb *sccb;
 759         int rc;
 760
 761         if (!SCLP_HAS_CHP_INFO)
 762                 return -EOPNOTSUPP;
 763         /* Prepare sccb. */
 764         sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 765         if (!sccb)
 766                 return -ENOMEM;
 767         sccb->header.length = sizeof(*sccb);
 768         rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
 769         if (rc)
 770                 goto out;
 771         if (sccb->header.response_code != 0x0010) {
 772                 pr_warning("read channel-path info failed "
 773                            "(response=0x%04x)\n", sccb->header.response_code);
 774                 rc = -EIO;
 775                 goto out;
 776         }
 777         memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
 778         memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
 779         memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
 780 out:
 781         free_page((unsigned long) sccb);
 782         return rc;
 783 }