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