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