drivers/s390/char/sclp_cmd.c

   1 /*
   2  * Copyright IBM Corp. 2007,2012
   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/export.h>
  16 #include <linux/slab.h>
  17 #include <linux/string.h>
  18 #include <linux/mm.h>
  19 #include <linux/mmzone.h>
  20 #include <linux/memory.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <asm/ctl_reg.h>
  24 #include <asm/chpid.h>
  25 #include <asm/setup.h>
  26 #include <asm/page.h>
  27 #include <asm/sclp.h>
  28
  29 #include "sclp.h"
  30
  31 static void sclp_sync_callback(struct sclp_req *req, void *data)
  32 {
  33         struct completion *completion = data;
  34
  35         complete(completion);
  36 }
  37
  38 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
  39 {
  40         struct completion completion;
  41         struct sclp_req *request;
  42         int rc;
  43
  44         request = kzalloc(sizeof(*request), GFP_KERNEL);
  45         if (!request)
  46                 return -ENOMEM;
  47         request->command = cmd;
  48         request->sccb = sccb;
  49         request->status = SCLP_REQ_FILLED;
  50         request->callback = sclp_sync_callback;
  51         request->callback_data = &completion;
  52         init_completion(&completion);
  53
  54         /* Perform sclp request. */
  55         rc = sclp_add_request(request);
  56         if (rc)
  57                 goto out;
  58         wait_for_completion(&completion);
  59
  60         /* Check response. */
  61         if (request->status != SCLP_REQ_DONE) {
  62                 pr_warning("sync request failed (cmd=0x%08x, "
  63                            "status=0x%02x)\n", cmd, request->status);
  64                 rc = -EIO;
  65         }
  66 out:
  67         kfree(request);
  68         return rc;
  69 }
  70
  71 /*
  72  * CPU configuration related functions.
  73  */
  74
  75 #define SCLP_CMDW_READ_CPU_INFO         0x00010001
  76 #define SCLP_CMDW_CONFIGURE_CPU         0x00110001
  77 #define SCLP_CMDW_DECONFIGURE_CPU       0x00100001
  78
  79 struct read_cpu_info_sccb {
  80         struct  sccb_header header;
  81         u16     nr_configured;
  82         u16     offset_configured;
  83         u16     nr_standby;
  84         u16     offset_standby;
  85         u8      reserved[4096 - 16];
  86 } __attribute__((packed, aligned(PAGE_SIZE)));
  87
  88 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
  89                                struct read_cpu_info_sccb *sccb)
  90 {
  91         char *page = (char *) sccb;
  92
  93         memset(info, 0, sizeof(*info));
  94         info->configured = sccb->nr_configured;
  95         info->standby = sccb->nr_standby;
  96         info->combined = sccb->nr_configured + sccb->nr_standby;
  97         info->has_cpu_type = sclp_fac84 & 0x1;
  98         memcpy(&info->cpu, page + sccb->offset_configured,
  99                info->combined * sizeof(struct sclp_cpu_entry));
 100 }
 101
 102 int sclp_get_cpu_info(struct sclp_cpu_info *info)
 103 {
 104         int rc;
 105         struct read_cpu_info_sccb *sccb;
 106
 107         if (!SCLP_HAS_CPU_INFO)
 108                 return -EOPNOTSUPP;
 109         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 110         if (!sccb)
 111                 return -ENOMEM;
 112         sccb->header.length = sizeof(*sccb);
 113         rc = sclp_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
 114         if (rc)
 115                 goto out;
 116         if (sccb->header.response_code != 0x0010) {
 117                 pr_warning("readcpuinfo failed (response=0x%04x)\n",
 118                            sccb->header.response_code);
 119                 rc = -EIO;
 120                 goto out;
 121         }
 122         sclp_fill_cpu_info(info, sccb);
 123 out:
 124         free_page((unsigned long) sccb);
 125         return rc;
 126 }
 127
 128 struct cpu_configure_sccb {
 129         struct sccb_header header;
 130 } __attribute__((packed, aligned(8)));
 131
 132 static int do_cpu_configure(sclp_cmdw_t cmd)
 133 {
 134         struct cpu_configure_sccb *sccb;
 135         int rc;
 136
 137         if (!SCLP_HAS_CPU_RECONFIG)
 138                 return -EOPNOTSUPP;
 139         /*
 140          * This is not going to cross a page boundary since we force
 141          * kmalloc to have a minimum alignment of 8 bytes on s390.
 142          */
 143         sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
 144         if (!sccb)
 145                 return -ENOMEM;
 146         sccb->header.length = sizeof(*sccb);
 147         rc = sclp_sync_request(cmd, sccb);
 148         if (rc)
 149                 goto out;
 150         switch (sccb->header.response_code) {
 151         case 0x0020:
 152         case 0x0120:
 153                 break;
 154         default:
 155                 pr_warning("configure cpu failed (cmd=0x%08x, "
 156                            "response=0x%04x)\n", cmd,
 157                            sccb->header.response_code);
 158                 rc = -EIO;
 159                 break;
 160         }
 161 out:
 162         kfree(sccb);
 163         return rc;
 164 }
 165
 166 int sclp_cpu_configure(u8 cpu)
 167 {
 168         return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
 169 }
 170
 171 int sclp_cpu_deconfigure(u8 cpu)
 172 {
 173         return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
 174 }
 175
 176 #ifdef CONFIG_MEMORY_HOTPLUG
 177
 178 static DEFINE_MUTEX(sclp_mem_mutex);
 179 static LIST_HEAD(sclp_mem_list);
 180 static u8 sclp_max_storage_id;
 181 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
 182 static int sclp_mem_state_changed;
 183
 184 struct memory_increment {
 185         struct list_head list;
 186         u16 rn;
 187         int standby;
 188 };
 189
 190 struct assign_storage_sccb {
 191         struct sccb_header header;
 192         u16 rn;
 193 } __packed;
 194
 195 int arch_get_memory_phys_device(unsigned long start_pfn)
 196 {
 197         if (!sclp_rzm)
 198                 return 0;
 199         return PFN_PHYS(start_pfn) >> ilog2(sclp_rzm);
 200 }
 201
 202 static unsigned long long rn2addr(u16 rn)
 203 {
 204         return (unsigned long long) (rn - 1) * sclp_rzm;
 205 }
 206
 207 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
 208 {
 209         struct assign_storage_sccb *sccb;
 210         int rc;
 211
 212         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 213         if (!sccb)
 214                 return -ENOMEM;
 215         sccb->header.length = PAGE_SIZE;
 216         sccb->rn = rn;
 217         rc = sclp_sync_request(cmd, sccb);
 218         if (rc)
 219                 goto out;
 220         switch (sccb->header.response_code) {
 221         case 0x0020:
 222         case 0x0120:
 223                 break;
 224         default:
 225                 pr_warning("assign storage failed (cmd=0x%08x, "
 226                            "response=0x%04x, rn=0x%04x)\n", cmd,
 227                            sccb->header.response_code, rn);
 228                 rc = -EIO;
 229                 break;
 230         }
 231 out:
 232         free_page((unsigned long) sccb);
 233         return rc;
 234 }
 235
 236 static int sclp_assign_storage(u16 rn)
 237 {
 238         unsigned long long start;
 239         int rc;
 240
 241         rc = do_assign_storage(0x000d0001, rn);
 242         if (rc)
 243                 return rc;
 244         start = rn2addr(rn);
 245         storage_key_init_range(start, start + sclp_rzm);
 246         return 0;
 247 }
 248
 249 static int sclp_unassign_storage(u16 rn)
 250 {
 251         return do_assign_storage(0x000c0001, rn);
 252 }
 253
 254 struct attach_storage_sccb {
 255         struct sccb_header header;
 256         u16 :16;
 257         u16 assigned;
 258         u32 :32;
 259         u32 entries[0];
 260 } __packed;
 261
 262 static int sclp_attach_storage(u8 id)
 263 {
 264         struct attach_storage_sccb *sccb;
 265         int rc;
 266         int i;
 267
 268         sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 269         if (!sccb)
 270                 return -ENOMEM;
 271         sccb->header.length = PAGE_SIZE;
 272         rc = sclp_sync_request(0x00080001 | id << 8, sccb);
 273         if (rc)
 274                 goto out;
 275         switch (sccb->header.response_code) {
 276         case 0x0020:
 277                 set_bit(id, sclp_storage_ids);
 278                 for (i = 0; i < sccb->assigned; i++) {
 279                         if (sccb->entries[i])
 280                                 sclp_unassign_storage(sccb->entries[i] >> 16);
 281                 }
 282                 break;
 283         default:
 284                 rc = -EIO;
 285                 break;
 286         }
 287 out:
 288         free_page((unsigned long) sccb);
 289         return rc;
 290 }
 291
 292 static int sclp_mem_change_state(unsigned long start, unsigned long size,
 293                                  int online)
 294 {
 295         struct memory_increment *incr;
 296         unsigned long long istart;
 297         int rc = 0;
 298
 299         list_for_each_entry(incr, &sclp_mem_list, list) {
 300                 istart = rn2addr(incr->rn);
 301                 if (start + size - 1 < istart)
 302                         break;
 303                 if (start > istart + sclp_rzm - 1)
 304                         continue;
 305                 if (online)
 306                         rc |= sclp_assign_storage(incr->rn);
 307                 else
 308                         sclp_unassign_storage(incr->rn);
 309         }
 310         return rc ? -EIO : 0;
 311 }
 312
 313 static int sclp_mem_notifier(struct notifier_block *nb,
 314                              unsigned long action, void *data)
 315 {
 316         unsigned long start, size;
 317         struct memory_notify *arg;
 318         unsigned char id;
 319         int rc = 0;
 320
 321         arg = data;
 322         start = arg->start_pfn << PAGE_SHIFT;
 323         size = arg->nr_pages << PAGE_SHIFT;
 324         mutex_lock(&sclp_mem_mutex);
 325         for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
 326                 sclp_attach_storage(id);
 327         switch (action) {
 328         case MEM_ONLINE:
 329         case MEM_GOING_OFFLINE:
 330         case MEM_CANCEL_OFFLINE:
 331                 break;
 332         case MEM_GOING_ONLINE:
 333                 rc = sclp_mem_change_state(start, size, 1);
 334                 break;
 335         case MEM_CANCEL_ONLINE:
 336                 sclp_mem_change_state(start, size, 0);
 337                 break;
 338         case MEM_OFFLINE:
 339                 sclp_mem_change_state(start, size, 0);
 340                 break;
 341         default:
 342                 rc = -EINVAL;
 343                 break;
 344         }
 345         if (!rc)
 346                 sclp_mem_state_changed = 1;
 347         mutex_unlock(&sclp_mem_mutex);
 348         return rc ? NOTIFY_BAD : NOTIFY_OK;
 349 }
 350
 351 static struct notifier_block sclp_mem_nb = {
 352         .notifier_call = sclp_mem_notifier,
 353 };
 354
 355 static void __init add_memory_merged(u16 rn)
 356 {
 357         static u16 first_rn, num;
 358         unsigned long long start, size;
 359
 360         if (rn && first_rn && (first_rn + num == rn)) {
 361                 num++;
 362                 return;
 363         }
 364         if (!first_rn)
 365                 goto skip_add;
 366         start = rn2addr(first_rn);
 367         size = (unsigned long long) num * sclp_rzm;
 368         if (start >= VMEM_MAX_PHYS)
 369                 goto skip_add;
 370         if (start + size > VMEM_MAX_PHYS)
 371                 size = VMEM_MAX_PHYS - start;
 372         if (memory_end_set && (start >= memory_end))
 373                 goto skip_add;
 374         if (memory_end_set && (start + size > memory_end))
 375                 size = memory_end - start;
 376         add_memory(0, start, size);
 377 skip_add:
 378         first_rn = rn;
 379         num = 1;
 380 }
 381
 382 static void __init sclp_add_standby_memory(void)
 383 {
 384         struct memory_increment *incr;
 385
 386         list_for_each_entry(incr, &sclp_mem_list, list)
 387                 if (incr->standby)
 388                         add_memory_merged(incr->rn);
 389         add_memory_merged(0);
 390 }
 391
 392 static void __init insert_increment(u16 rn, int standby, int assigned)
 393 {
 394         struct memory_increment *incr, *new_incr;
 395         struct list_head *prev;
 396         u16 last_rn;
 397
 398         new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
 399         if (!new_incr)
 400                 return;
 401         new_incr->rn = rn;
 402         new_incr->standby = standby;
 403         last_rn = 0;
 404         prev = &sclp_mem_list;
 405         list_for_each_entry(incr, &sclp_mem_list, list) {
 406                 if (assigned && incr->rn > rn)
 407                         break;
 408                 if (!assigned && incr->rn - last_rn > 1)
 409                         break;
 410                 last_rn = incr->rn;
 411                 prev = &incr->list;
 412         }
 413         if (!assigned)
 414                 new_incr->rn = last_rn + 1;
 415         if (new_incr->rn > sclp_rnmax) {
 416                 kfree(new_incr);
 417                 return;
 418         }
 419         list_add(&new_incr->list, prev);
 420 }
 421
 422 static int sclp_mem_freeze(struct device *dev)
 423 {
 424         if (!sclp_mem_state_changed)
 425                 return 0;
 426         pr_err("Memory hotplug state changed, suspend refused.\n");
 427         return -EPERM;
 428 }
 429
 430 struct read_storage_sccb {
 431         struct sccb_header header;
 432         u16 max_id;
 433         u16 assigned;
 434         u16 standby;
 435         u16 :16;
 436         u32 entries[0];
 437 } __packed;
 438
 439 static const struct dev_pm_ops sclp_mem_pm_ops = {
 440         .freeze         = sclp_mem_freeze,
 441 };
 442
 443 static struct platform_driver sclp_mem_pdrv = {
 444         .driver = {
 445                 .name   = "sclp_mem",
 446                 .pm     = &sclp_mem_pm_ops,
 447         },
 448 };
 449
 450 static int __init sclp_detect_standby_memory(void)
 451 {
 452         struct platform_device *sclp_pdev;
 453         struct read_storage_sccb *sccb;
 454         int i, id, assigned, rc;
 455
 456         if (OLDMEM_BASE) /* No standby memory in kdump mode */
 457                 return 0;
 458         if (!sclp_early_read_info_sccb_valid)
 459                 return 0;
 460         if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
 461                 return 0;
 462         rc = -ENOMEM;
 463         sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
 464         if (!sccb)
 465                 goto out;
 466         assigned = 0;
 467         for (id = 0; id <= sclp_max_storage_id; id++) {
 468                 memset(sccb, 0, PAGE_SIZE);
 469                 sccb->header.length = PAGE_SIZE;
 470                 rc = sclp_sync_request(0x00040001 | id << 8, sccb);
 471                 if (rc)
 472                         goto out;
 473                 switch (sccb->header.response_code) {
 474                 case 0x0010:
 475                         set_bit(id, sclp_storage_ids);
 476                         for (i = 0; i < sccb->assigned; i++) {
 477                                 if (!sccb->entries[i])
 478                                         continue;
 479                                 assigned++;
 480                                 insert_increment(sccb->entries[i] >> 16, 0, 1);
 481                         }
 482                         break;
 483                 case 0x0310:
 484                         break;
 485                 case 0x0410:
 486                         for (i = 0; i < sccb->assigned; i++) {
 487                                 if (!sccb->entries[i])
 488                                         continue;
 489                                 assigned++;
 490                                 insert_increment(sccb->entries[i] >> 16, 1, 1);
 491                         }
 492                         break;
 493                 default:
 494                         rc = -EIO;
 495                         break;
 496                 }
 497                 if (!rc)
 498                         sclp_max_storage_id = sccb->max_id;
 499         }
 500         if (rc || list_empty(&sclp_mem_list))
 501                 goto out;
 502         for (i = 1; i <= sclp_rnmax - assigned; i++)
 503                 insert_increment(0, 1, 0);
 504         rc = register_memory_notifier(&sclp_mem_nb);
 505         if (rc)
 506                 goto out;
 507         rc = platform_driver_register(&sclp_mem_pdrv);
 508         if (rc)
 509                 goto out;
 510         sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
 511         rc = PTR_RET(sclp_pdev);
 512         if (rc)
 513                 goto out_driver;
 514         sclp_add_standby_memory();
 515         goto out;
 516 out_driver:
 517         platform_driver_unregister(&sclp_mem_pdrv);
 518 out:
 519         free_page((unsigned long) sccb);
 520         return rc;
 521 }
 522 __initcall(sclp_detect_standby_memory);
 523
 524 #endif /* CONFIG_MEMORY_HOTPLUG */
 525
 526 /*
 527  * PCI I/O adapter configuration related functions.
 528  */
 529 #define SCLP_CMDW_CONFIGURE_PCI                 0x001a0001
 530 #define SCLP_CMDW_DECONFIGURE_PCI               0x001b0001
 531
 532 #define SCLP_RECONFIG_PCI_ATPYE                 2
 533
 534 struct pci_cfg_sccb {
 535         struct sccb_header header;
 536         u8 atype;               /* adapter type */
 537         u8 reserved1;
 538         u16 reserved2;
 539         u32 aid;                /* adapter identifier */
 540 } __packed;
 541
 542 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
 543 {
 544         struct pci_cfg_sccb *sccb;
 545         int rc;
 546
 547         if (!SCLP_HAS_PCI_RECONFIG)
 548                 return -EOPNOTSUPP;
 549
 550         sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 551         if (!sccb)
 552                 return -ENOMEM;
 553
 554         sccb->header.length = PAGE_SIZE;
 555         sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
 556         sccb->aid = fid;
 557         rc = sclp_sync_request(cmd, sccb);
 558         if (rc)
 559                 goto out;
 560         switch (sccb->header.response_code) {
 561         case 0x0020:
 562         case 0x0120:
 563                 break;
 564         default:
 565                 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x  response=0x%04x\n",
 566                         cmd, sccb->header.response_code);
 567                 rc = -EIO;
 568                 break;
 569         }
 570 out:
 571         free_page((unsigned long) sccb);
 572         return rc;
 573 }
 574
 575 int sclp_pci_configure(u32 fid)
 576 {
 577         return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
 578 }
 579 EXPORT_SYMBOL(sclp_pci_configure);
 580
 581 int sclp_pci_deconfigure(u32 fid)
 582 {
 583         return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
 584 }
 585 EXPORT_SYMBOL(sclp_pci_deconfigure);
 586
 587 /*
 588  * Channel path configuration related functions.
 589  */
 590
 591 #define SCLP_CMDW_CONFIGURE_CHPATH              0x000f0001
 592 #define SCLP_CMDW_DECONFIGURE_CHPATH            0x000e0001
 593 #define SCLP_CMDW_READ_CHPATH_INFORMATION       0x00030001
 594
 595 struct chp_cfg_sccb {
 596         struct sccb_header header;
 597         u8 ccm;
 598         u8 reserved[6];
 599         u8 cssid;
 600 } __attribute__((packed));
 601
 602 static int do_chp_configure(sclp_cmdw_t cmd)
 603 {
 604         struct chp_cfg_sccb *sccb;
 605         int rc;
 606
 607         if (!SCLP_HAS_CHP_RECONFIG)
 608                 return -EOPNOTSUPP;
 609         /* Prepare sccb. */
 610         sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 611         if (!sccb)
 612                 return -ENOMEM;
 613         sccb->header.length = sizeof(*sccb);
 614         rc = sclp_sync_request(cmd, sccb);
 615         if (rc)
 616                 goto out;
 617         switch (sccb->header.response_code) {
 618         case 0x0020:
 619         case 0x0120:
 620         case 0x0440:
 621         case 0x0450:
 622                 break;
 623         default:
 624                 pr_warning("configure channel-path failed "
 625                            "(cmd=0x%08x, response=0x%04x)\n", cmd,
 626                            sccb->header.response_code);
 627                 rc = -EIO;
 628                 break;
 629         }
 630 out:
 631         free_page((unsigned long) sccb);
 632         return rc;
 633 }
 634
 635 /**
 636  * sclp_chp_configure - perform configure channel-path sclp command
 637  * @chpid: channel-path ID
 638  *
 639  * Perform configure channel-path command sclp command for specified chpid.
 640  * Return 0 after command successfully finished, non-zero otherwise.
 641  */
 642 int sclp_chp_configure(struct chp_id chpid)
 643 {
 644         return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
 645 }
 646
 647 /**
 648  * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
 649  * @chpid: channel-path ID
 650  *
 651  * Perform deconfigure channel-path command sclp command for specified chpid
 652  * and wait for completion. On success return 0. Return non-zero otherwise.
 653  */
 654 int sclp_chp_deconfigure(struct chp_id chpid)
 655 {
 656         return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
 657 }
 658
 659 struct chp_info_sccb {
 660         struct sccb_header header;
 661         u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
 662         u8 standby[SCLP_CHP_INFO_MASK_SIZE];
 663         u8 configured[SCLP_CHP_INFO_MASK_SIZE];
 664         u8 ccm;
 665         u8 reserved[6];
 666         u8 cssid;
 667 } __attribute__((packed));
 668
 669 /**
 670  * sclp_chp_read_info - perform read channel-path information sclp command
 671  * @info: resulting channel-path information data
 672  *
 673  * Perform read channel-path information sclp command and wait for completion.
 674  * On success, store channel-path information in @info and return 0. Return
 675  * non-zero otherwise.
 676  */
 677 int sclp_chp_read_info(struct sclp_chp_info *info)
 678 {
 679         struct chp_info_sccb *sccb;
 680         int rc;
 681
 682         if (!SCLP_HAS_CHP_INFO)
 683                 return -EOPNOTSUPP;
 684         /* Prepare sccb. */
 685         sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 686         if (!sccb)
 687                 return -ENOMEM;
 688         sccb->header.length = sizeof(*sccb);
 689         rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
 690         if (rc)
 691                 goto out;
 692         if (sccb->header.response_code != 0x0010) {
 693                 pr_warning("read channel-path info failed "
 694                            "(response=0x%04x)\n", sccb->header.response_code);
 695                 rc = -EIO;
 696                 goto out;
 697         }
 698         memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
 699         memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
 700         memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
 701 out:
 702         free_page((unsigned long) sccb);
 703         return rc;
 704 }