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/module.h> 21 #include <linux/platform_device.h> 22 #include <asm/chpid.h> 23 #include <asm/sclp.h> 24 #include <asm/setup.h> 25 #include <asm/ctl_reg.h> 26 27 #include "sclp.h" 28 29 #define SCLP_CMDW_READ_SCP_INFO 0x00020001 30 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 31 32 struct read_info_sccb { 33 struct sccb_header header; /* 0-7 */ 34 u16 rnmax; /* 8-9 */ 35 u8 rnsize; /* 10 */ 36 u8 _reserved0[24 - 11]; /* 11-15 */ 37 u8 loadparm[8]; /* 24-31 */ 38 u8 _reserved1[48 - 32]; /* 32-47 */ 39 u64 facilities; /* 48-55 */ 40 u8 _reserved2[84 - 56]; /* 56-83 */ 41 u8 fac84; /* 84 */ 42 u8 fac85; /* 85 */ 43 u8 _reserved3[91 - 86]; /* 86-90 */ 44 u8 flags; /* 91 */ 45 u8 _reserved4[100 - 92]; /* 92-99 */ 46 u32 rnsize2; /* 100-103 */ 47 u64 rnmax2; /* 104-111 */ 48 u8 _reserved5[4096 - 112]; /* 112-4095 */ 49 } __attribute__((packed, aligned(PAGE_SIZE))); 50 51 static struct init_sccb __initdata early_event_mask_sccb __aligned(PAGE_SIZE); 52 static struct read_info_sccb __initdata early_read_info_sccb; 53 static int __initdata early_read_info_sccb_valid; 54 55 u64 sclp_facilities; 56 static u8 sclp_fac84; 57 static u8 sclp_fac85; 58 static unsigned long long rzm; 59 static unsigned long long rnmax; 60 61 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) 62 { 63 int rc; 64 65 __ctl_set_bit(0, 9); 66 rc = sclp_service_call(cmd, sccb); 67 if (rc) 68 goto out; 69 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | 70 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); 71 local_irq_disable(); 72 out: 73 /* Contents of the sccb might have changed. */ 74 barrier(); 75 __ctl_clear_bit(0, 9); 76 return rc; 77 } 78 79 static void __init sclp_read_info_early(void) 80 { 81 int rc; 82 int i; 83 struct read_info_sccb *sccb; 84 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, 85 SCLP_CMDW_READ_SCP_INFO}; 86 87 sccb = &early_read_info_sccb; 88 for (i = 0; i < ARRAY_SIZE(commands); i++) { 89 do { 90 memset(sccb, 0, sizeof(*sccb)); 91 sccb->header.length = sizeof(*sccb); 92 sccb->header.function_code = 0x80; 93 sccb->header.control_mask[2] = 0x80; 94 rc = sclp_cmd_sync_early(commands[i], sccb); 95 } while (rc == -EBUSY); 96 97 if (rc) 98 break; 99 if (sccb->header.response_code == 0x10) { 100 early_read_info_sccb_valid = 1; 101 break; 102 } 103 if (sccb->header.response_code != 0x1f0) 104 break; 105 } 106 } 107 108 static void __init sclp_event_mask_early(void) 109 { 110 struct init_sccb *sccb = &early_event_mask_sccb; 111 int rc; 112 113 do { 114 memset(sccb, 0, sizeof(*sccb)); 115 sccb->header.length = sizeof(*sccb); 116 sccb->mask_length = sizeof(sccb_mask_t); 117 rc = sclp_cmd_sync_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); 118 } while (rc == -EBUSY); 119 } 120 121 void __init sclp_facilities_detect(void) 122 { 123 struct read_info_sccb *sccb; 124 125 sclp_read_info_early(); 126 if (!early_read_info_sccb_valid) 127 return; 128 129 sccb = &early_read_info_sccb; 130 sclp_facilities = sccb->facilities; 131 sclp_fac84 = sccb->fac84; 132 sclp_fac85 = sccb->fac85; 133 rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 134 rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 135 rzm <<= 20; 136 137 sclp_event_mask_early(); 138 } 139 140 bool __init sclp_has_linemode(void) 141 { 142 struct init_sccb *sccb = &early_event_mask_sccb; 143 144 if (sccb->header.response_code != 0x20) 145 return 0; 146 if (sccb->sclp_send_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)) 147 return 1; 148 return 0; 149 } 150 151 bool __init sclp_has_vt220(void) 152 { 153 struct init_sccb *sccb = &early_event_mask_sccb; 154 155 if (sccb->header.response_code != 0x20) 156 return 0; 157 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) 158 return 1; 159 return 0; 160 } 161 162 unsigned long long sclp_get_rnmax(void) 163 { 164 return rnmax; 165 } 166 167 unsigned long long sclp_get_rzm(void) 168 { 169 return rzm; 170 } 171 172 u8 sclp_get_fac85(void) 173 { 174 return sclp_fac85; 175 } 176 EXPORT_SYMBOL_GPL(sclp_get_fac85); 177 178 /* 179 * This function will be called after sclp_facilities_detect(), which gets 180 * called from early.c code. Therefore the sccb should have valid contents. 181 */ 182 void __init sclp_get_ipl_info(struct sclp_ipl_info *info) 183 { 184 struct read_info_sccb *sccb; 185 186 if (!early_read_info_sccb_valid) 187 return; 188 sccb = &early_read_info_sccb; 189 info->is_valid = 1; 190 if (sccb->flags & 0x2) 191 info->has_dump = 1; 192 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN); 193 } 194 195 static void sclp_sync_callback(struct sclp_req *req, void *data) 196 { 197 struct completion *completion = data; 198 199 complete(completion); 200 } 201 202 static int do_sync_request(sclp_cmdw_t cmd, void *sccb) 203 { 204 struct completion completion; 205 struct sclp_req *request; 206 int rc; 207 208 request = kzalloc(sizeof(*request), GFP_KERNEL); 209 if (!request) 210 return -ENOMEM; 211 request->command = cmd; 212 request->sccb = sccb; 213 request->status = SCLP_REQ_FILLED; 214 request->callback = sclp_sync_callback; 215 request->callback_data = &completion; 216 init_completion(&completion); 217 218 /* Perform sclp request. */ 219 rc = sclp_add_request(request); 220 if (rc) 221 goto out; 222 wait_for_completion(&completion); 223 224 /* Check response. */ 225 if (request->status != SCLP_REQ_DONE) { 226 pr_warning("sync request failed (cmd=0x%08x, " 227 "status=0x%02x)\n", cmd, request->status); 228 rc = -EIO; 229 } 230 out: 231 kfree(request); 232 return rc; 233 } 234 235 /* 236 * CPU configuration related functions. 237 */ 238 239 #define SCLP_CMDW_READ_CPU_INFO 0x00010001 240 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001 241 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001 242 243 struct read_cpu_info_sccb { 244 struct sccb_header header; 245 u16 nr_configured; 246 u16 offset_configured; 247 u16 nr_standby; 248 u16 offset_standby; 249 u8 reserved[4096 - 16]; 250 } __attribute__((packed, aligned(PAGE_SIZE))); 251 252 static void sclp_fill_cpu_info(struct sclp_cpu_info *info, 253 struct read_cpu_info_sccb *sccb) 254 { 255 char *page = (char *) sccb; 256 257 memset(info, 0, sizeof(*info)); 258 info->configured = sccb->nr_configured; 259 info->standby = sccb->nr_standby; 260 info->combined = sccb->nr_configured + sccb->nr_standby; 261 info->has_cpu_type = sclp_fac84 & 0x1; 262 memcpy(&info->cpu, page + sccb->offset_configured, 263 info->combined * sizeof(struct sclp_cpu_entry)); 264 } 265 266 int sclp_get_cpu_info(struct sclp_cpu_info *info) 267 { 268 int rc; 269 struct read_cpu_info_sccb *sccb; 270 271 if (!SCLP_HAS_CPU_INFO) 272 return -EOPNOTSUPP; 273 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 274 if (!sccb) 275 return -ENOMEM; 276 sccb->header.length = sizeof(*sccb); 277 rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb); 278 if (rc) 279 goto out; 280 if (sccb->header.response_code != 0x0010) { 281 pr_warning("readcpuinfo failed (response=0x%04x)\n", 282 sccb->header.response_code); 283 rc = -EIO; 284 goto out; 285 } 286 sclp_fill_cpu_info(info, sccb); 287 out: 288 free_page((unsigned long) sccb); 289 return rc; 290 } 291 292 struct cpu_configure_sccb { 293 struct sccb_header header; 294 } __attribute__((packed, aligned(8))); 295 296 static int do_cpu_configure(sclp_cmdw_t cmd) 297 { 298 struct cpu_configure_sccb *sccb; 299 int rc; 300 301 if (!SCLP_HAS_CPU_RECONFIG) 302 return -EOPNOTSUPP; 303 /* 304 * This is not going to cross a page boundary since we force 305 * kmalloc to have a minimum alignment of 8 bytes on s390. 306 */ 307 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); 308 if (!sccb) 309 return -ENOMEM; 310 sccb->header.length = sizeof(*sccb); 311 rc = do_sync_request(cmd, sccb); 312 if (rc) 313 goto out; 314 switch (sccb->header.response_code) { 315 case 0x0020: 316 case 0x0120: 317 break; 318 default: 319 pr_warning("configure cpu failed (cmd=0x%08x, " 320 "response=0x%04x)\n", cmd, 321 sccb->header.response_code); 322 rc = -EIO; 323 break; 324 } 325 out: 326 kfree(sccb); 327 return rc; 328 } 329 330 int sclp_cpu_configure(u8 cpu) 331 { 332 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8); 333 } 334 335 int sclp_cpu_deconfigure(u8 cpu) 336 { 337 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8); 338 } 339 340 #ifdef CONFIG_MEMORY_HOTPLUG 341 342 static DEFINE_MUTEX(sclp_mem_mutex); 343 static LIST_HEAD(sclp_mem_list); 344 static u8 sclp_max_storage_id; 345 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG]; 346 static int sclp_mem_state_changed; 347 348 struct memory_increment { 349 struct list_head list; 350 u16 rn; 351 int standby; 352 int usecount; 353 }; 354 355 struct assign_storage_sccb { 356 struct sccb_header header; 357 u16 rn; 358 } __packed; 359 360 int arch_get_memory_phys_device(unsigned long start_pfn) 361 { 362 if (!rzm) 363 return 0; 364 return PFN_PHYS(start_pfn) >> ilog2(rzm); 365 } 366 367 static unsigned long long rn2addr(u16 rn) 368 { 369 return (unsigned long long) (rn - 1) * rzm; 370 } 371 372 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) 373 { 374 struct assign_storage_sccb *sccb; 375 int rc; 376 377 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 378 if (!sccb) 379 return -ENOMEM; 380 sccb->header.length = PAGE_SIZE; 381 sccb->rn = rn; 382 rc = do_sync_request(cmd, sccb); 383 if (rc) 384 goto out; 385 switch (sccb->header.response_code) { 386 case 0x0020: 387 case 0x0120: 388 break; 389 default: 390 pr_warning("assign storage failed (cmd=0x%08x, " 391 "response=0x%04x, rn=0x%04x)\n", cmd, 392 sccb->header.response_code, rn); 393 rc = -EIO; 394 break; 395 } 396 out: 397 free_page((unsigned long) sccb); 398 return rc; 399 } 400 401 static int sclp_assign_storage(u16 rn) 402 { 403 unsigned long long start, address; 404 int rc; 405 406 rc = do_assign_storage(0x000d0001, rn); 407 if (rc) 408 goto out; 409 start = address = rn2addr(rn); 410 for (; address < start + rzm; address += PAGE_SIZE) 411 page_set_storage_key(address, PAGE_DEFAULT_KEY, 0); 412 out: 413 return rc; 414 } 415 416 static int sclp_unassign_storage(u16 rn) 417 { 418 return do_assign_storage(0x000c0001, rn); 419 } 420 421 struct attach_storage_sccb { 422 struct sccb_header header; 423 u16 :16; 424 u16 assigned; 425 u32 :32; 426 u32 entries[0]; 427 } __packed; 428 429 static int sclp_attach_storage(u8 id) 430 { 431 struct attach_storage_sccb *sccb; 432 int rc; 433 int i; 434 435 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 436 if (!sccb) 437 return -ENOMEM; 438 sccb->header.length = PAGE_SIZE; 439 rc = do_sync_request(0x00080001 | id << 8, sccb); 440 if (rc) 441 goto out; 442 switch (sccb->header.response_code) { 443 case 0x0020: 444 set_bit(id, sclp_storage_ids); 445 for (i = 0; i < sccb->assigned; i++) { 446 if (sccb->entries[i]) 447 sclp_unassign_storage(sccb->entries[i] >> 16); 448 } 449 break; 450 default: 451 rc = -EIO; 452 break; 453 } 454 out: 455 free_page((unsigned long) sccb); 456 return rc; 457 } 458 459 static int sclp_mem_change_state(unsigned long start, unsigned long size, 460 int online) 461 { 462 struct memory_increment *incr; 463 unsigned long long istart; 464 int rc = 0; 465 466 list_for_each_entry(incr, &sclp_mem_list, list) { 467 istart = rn2addr(incr->rn); 468 if (start + size - 1 < istart) 469 break; 470 if (start > istart + rzm - 1) 471 continue; 472 if (online) { 473 if (incr->usecount++) 474 continue; 475 /* 476 * Don't break the loop if one assign fails. Loop may 477 * be walked again on CANCEL and we can't save 478 * information if state changed before or not. 479 * So continue and increase usecount for all increments. 480 */ 481 rc |= sclp_assign_storage(incr->rn); 482 } else { 483 if (--incr->usecount) 484 continue; 485 sclp_unassign_storage(incr->rn); 486 } 487 } 488 return rc ? -EIO : 0; 489 } 490 491 static int sclp_mem_notifier(struct notifier_block *nb, 492 unsigned long action, void *data) 493 { 494 unsigned long start, size; 495 struct memory_notify *arg; 496 unsigned char id; 497 int rc = 0; 498 499 arg = data; 500 start = arg->start_pfn << PAGE_SHIFT; 501 size = arg->nr_pages << PAGE_SHIFT; 502 mutex_lock(&sclp_mem_mutex); 503 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1) 504 sclp_attach_storage(id); 505 switch (action) { 506 case MEM_ONLINE: 507 case MEM_GOING_OFFLINE: 508 case MEM_CANCEL_OFFLINE: 509 break; 510 case MEM_GOING_ONLINE: 511 rc = sclp_mem_change_state(start, size, 1); 512 break; 513 case MEM_CANCEL_ONLINE: 514 sclp_mem_change_state(start, size, 0); 515 break; 516 case MEM_OFFLINE: 517 sclp_mem_change_state(start, size, 0); 518 break; 519 default: 520 rc = -EINVAL; 521 break; 522 } 523 if (!rc) 524 sclp_mem_state_changed = 1; 525 mutex_unlock(&sclp_mem_mutex); 526 return rc ? NOTIFY_BAD : NOTIFY_OK; 527 } 528 529 static struct notifier_block sclp_mem_nb = { 530 .notifier_call = sclp_mem_notifier, 531 }; 532 533 static void __init add_memory_merged(u16 rn) 534 { 535 static u16 first_rn, num; 536 unsigned long long start, size; 537 538 if (rn && first_rn && (first_rn + num == rn)) { 539 num++; 540 return; 541 } 542 if (!first_rn) 543 goto skip_add; 544 start = rn2addr(first_rn); 545 size = (unsigned long long ) num * rzm; 546 if (start >= VMEM_MAX_PHYS) 547 goto skip_add; 548 if (start + size > VMEM_MAX_PHYS) 549 size = VMEM_MAX_PHYS - start; 550 if (memory_end_set && (start >= memory_end)) 551 goto skip_add; 552 if (memory_end_set && (start + size > memory_end)) 553 size = memory_end - start; 554 add_memory(0, start, size); 555 skip_add: 556 first_rn = rn; 557 num = 1; 558 } 559 560 static void __init sclp_add_standby_memory(void) 561 { 562 struct memory_increment *incr; 563 564 list_for_each_entry(incr, &sclp_mem_list, list) 565 if (incr->standby) 566 add_memory_merged(incr->rn); 567 add_memory_merged(0); 568 } 569 570 static void __init insert_increment(u16 rn, int standby, int assigned) 571 { 572 struct memory_increment *incr, *new_incr; 573 struct list_head *prev; 574 u16 last_rn; 575 576 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); 577 if (!new_incr) 578 return; 579 new_incr->rn = rn; 580 new_incr->standby = standby; 581 if (!standby) 582 new_incr->usecount = 1; 583 last_rn = 0; 584 prev = &sclp_mem_list; 585 list_for_each_entry(incr, &sclp_mem_list, list) { 586 if (assigned && incr->rn > rn) 587 break; 588 if (!assigned && incr->rn - last_rn > 1) 589 break; 590 last_rn = incr->rn; 591 prev = &incr->list; 592 } 593 if (!assigned) 594 new_incr->rn = last_rn + 1; 595 if (new_incr->rn > rnmax) { 596 kfree(new_incr); 597 return; 598 } 599 list_add(&new_incr->list, prev); 600 } 601 602 static int sclp_mem_freeze(struct device *dev) 603 { 604 if (!sclp_mem_state_changed) 605 return 0; 606 pr_err("Memory hotplug state changed, suspend refused.\n"); 607 return -EPERM; 608 } 609 610 struct read_storage_sccb { 611 struct sccb_header header; 612 u16 max_id; 613 u16 assigned; 614 u16 standby; 615 u16 :16; 616 u32 entries[0]; 617 } __packed; 618 619 static const struct dev_pm_ops sclp_mem_pm_ops = { 620 .freeze = sclp_mem_freeze, 621 }; 622 623 static struct platform_driver sclp_mem_pdrv = { 624 .driver = { 625 .name = "sclp_mem", 626 .pm = &sclp_mem_pm_ops, 627 }, 628 }; 629 630 static int __init sclp_detect_standby_memory(void) 631 { 632 struct platform_device *sclp_pdev; 633 struct read_storage_sccb *sccb; 634 int i, id, assigned, rc; 635 636 if (!early_read_info_sccb_valid) 637 return 0; 638 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL) 639 return 0; 640 rc = -ENOMEM; 641 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA); 642 if (!sccb) 643 goto out; 644 assigned = 0; 645 for (id = 0; id <= sclp_max_storage_id; id++) { 646 memset(sccb, 0, PAGE_SIZE); 647 sccb->header.length = PAGE_SIZE; 648 rc = do_sync_request(0x00040001 | id << 8, sccb); 649 if (rc) 650 goto out; 651 switch (sccb->header.response_code) { 652 case 0x0010: 653 set_bit(id, sclp_storage_ids); 654 for (i = 0; i < sccb->assigned; i++) { 655 if (!sccb->entries[i]) 656 continue; 657 assigned++; 658 insert_increment(sccb->entries[i] >> 16, 0, 1); 659 } 660 break; 661 case 0x0310: 662 break; 663 case 0x0410: 664 for (i = 0; i < sccb->assigned; i++) { 665 if (!sccb->entries[i]) 666 continue; 667 assigned++; 668 insert_increment(sccb->entries[i] >> 16, 1, 1); 669 } 670 break; 671 default: 672 rc = -EIO; 673 break; 674 } 675 if (!rc) 676 sclp_max_storage_id = sccb->max_id; 677 } 678 if (rc || list_empty(&sclp_mem_list)) 679 goto out; 680 for (i = 1; i <= rnmax - assigned; i++) 681 insert_increment(0, 1, 0); 682 rc = register_memory_notifier(&sclp_mem_nb); 683 if (rc) 684 goto out; 685 rc = platform_driver_register(&sclp_mem_pdrv); 686 if (rc) 687 goto out; 688 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0); 689 rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0; 690 if (rc) 691 goto out_driver; 692 sclp_add_standby_memory(); 693 goto out; 694 out_driver: 695 platform_driver_unregister(&sclp_mem_pdrv); 696 out: 697 free_page((unsigned long) sccb); 698 return rc; 699 } 700 __initcall(sclp_detect_standby_memory); 701 702 #endif /* CONFIG_MEMORY_HOTPLUG */ 703 704 /* 705 * Channel path configuration related functions. 706 */ 707 708 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 709 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 710 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 711 712 struct chp_cfg_sccb { 713 struct sccb_header header; 714 u8 ccm; 715 u8 reserved[6]; 716 u8 cssid; 717 } __attribute__((packed)); 718 719 static int do_chp_configure(sclp_cmdw_t cmd) 720 { 721 struct chp_cfg_sccb *sccb; 722 int rc; 723 724 if (!SCLP_HAS_CHP_RECONFIG) 725 return -EOPNOTSUPP; 726 /* Prepare sccb. */ 727 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 728 if (!sccb) 729 return -ENOMEM; 730 sccb->header.length = sizeof(*sccb); 731 rc = do_sync_request(cmd, sccb); 732 if (rc) 733 goto out; 734 switch (sccb->header.response_code) { 735 case 0x0020: 736 case 0x0120: 737 case 0x0440: 738 case 0x0450: 739 break; 740 default: 741 pr_warning("configure channel-path failed " 742 "(cmd=0x%08x, response=0x%04x)\n", cmd, 743 sccb->header.response_code); 744 rc = -EIO; 745 break; 746 } 747 out: 748 free_page((unsigned long) sccb); 749 return rc; 750 } 751 752 /** 753 * sclp_chp_configure - perform configure channel-path sclp command 754 * @chpid: channel-path ID 755 * 756 * Perform configure channel-path command sclp command for specified chpid. 757 * Return 0 after command successfully finished, non-zero otherwise. 758 */ 759 int sclp_chp_configure(struct chp_id chpid) 760 { 761 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); 762 } 763 764 /** 765 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command 766 * @chpid: channel-path ID 767 * 768 * Perform deconfigure channel-path command sclp command for specified chpid 769 * and wait for completion. On success return 0. Return non-zero otherwise. 770 */ 771 int sclp_chp_deconfigure(struct chp_id chpid) 772 { 773 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); 774 } 775 776 struct chp_info_sccb { 777 struct sccb_header header; 778 u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; 779 u8 standby[SCLP_CHP_INFO_MASK_SIZE]; 780 u8 configured[SCLP_CHP_INFO_MASK_SIZE]; 781 u8 ccm; 782 u8 reserved[6]; 783 u8 cssid; 784 } __attribute__((packed)); 785 786 /** 787 * sclp_chp_read_info - perform read channel-path information sclp command 788 * @info: resulting channel-path information data 789 * 790 * Perform read channel-path information sclp command and wait for completion. 791 * On success, store channel-path information in @info and return 0. Return 792 * non-zero otherwise. 793 */ 794 int sclp_chp_read_info(struct sclp_chp_info *info) 795 { 796 struct chp_info_sccb *sccb; 797 int rc; 798 799 if (!SCLP_HAS_CHP_INFO) 800 return -EOPNOTSUPP; 801 /* Prepare sccb. */ 802 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 803 if (!sccb) 804 return -ENOMEM; 805 sccb->header.length = sizeof(*sccb); 806 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); 807 if (rc) 808 goto out; 809 if (sccb->header.response_code != 0x0010) { 810 pr_warning("read channel-path info failed " 811 "(response=0x%04x)\n", sccb->header.response_code); 812 rc = -EIO; 813 goto out; 814 } 815 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); 816 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); 817 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); 818 out: 819 free_page((unsigned long) sccb); 820 return rc; 821 } 822