drivers/s390/char/sclp_cmd.c

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