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