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 #define SCLP_CMDW_READ_SCP_INFO 0x00020001 32 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 33 34 struct read_info_sccb { 35 struct sccb_header header; /* 0-7 */ 36 u16 rnmax; /* 8-9 */ 37 u8 rnsize; /* 10 */ 38 u8 _reserved0[24 - 11]; /* 11-15 */ 39 u8 loadparm[8]; /* 24-31 */ 40 u8 _reserved1[48 - 32]; /* 32-47 */ 41 u64 facilities; /* 48-55 */ 42 u8 _reserved2[84 - 56]; /* 56-83 */ 43 u8 fac84; /* 84 */ 44 u8 fac85; /* 85 */ 45 u8 _reserved3[91 - 86]; /* 86-90 */ 46 u8 flags; /* 91 */ 47 u8 _reserved4[100 - 92]; /* 92-99 */ 48 u32 rnsize2; /* 100-103 */ 49 u64 rnmax2; /* 104-111 */ 50 u8 _reserved5[4096 - 112]; /* 112-4095 */ 51 } __attribute__((packed, aligned(PAGE_SIZE))); 52 53 static struct init_sccb __initdata early_event_mask_sccb __aligned(PAGE_SIZE); 54 static struct read_info_sccb __initdata early_read_info_sccb; 55 static int __initdata early_read_info_sccb_valid; 56 57 u64 sclp_facilities; 58 static u8 sclp_fac84; 59 static u8 sclp_fac85; 60 static unsigned long long rzm; 61 static unsigned long long rnmax; 62 63 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) 64 { 65 int rc; 66 67 __ctl_set_bit(0, 9); 68 rc = sclp_service_call(cmd, sccb); 69 if (rc) 70 goto out; 71 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | 72 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); 73 local_irq_disable(); 74 out: 75 /* Contents of the sccb might have changed. */ 76 barrier(); 77 __ctl_clear_bit(0, 9); 78 return rc; 79 } 80 81 static void __init sclp_read_info_early(void) 82 { 83 int rc; 84 int i; 85 struct read_info_sccb *sccb; 86 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, 87 SCLP_CMDW_READ_SCP_INFO}; 88 89 sccb = &early_read_info_sccb; 90 for (i = 0; i < ARRAY_SIZE(commands); i++) { 91 do { 92 memset(sccb, 0, sizeof(*sccb)); 93 sccb->header.length = sizeof(*sccb); 94 sccb->header.function_code = 0x80; 95 sccb->header.control_mask[2] = 0x80; 96 rc = sclp_cmd_sync_early(commands[i], sccb); 97 } while (rc == -EBUSY); 98 99 if (rc) 100 break; 101 if (sccb->header.response_code == 0x10) { 102 early_read_info_sccb_valid = 1; 103 break; 104 } 105 if (sccb->header.response_code != 0x1f0) 106 break; 107 } 108 } 109 110 static void __init sclp_event_mask_early(void) 111 { 112 struct init_sccb *sccb = &early_event_mask_sccb; 113 int rc; 114 115 do { 116 memset(sccb, 0, sizeof(*sccb)); 117 sccb->header.length = sizeof(*sccb); 118 sccb->mask_length = sizeof(sccb_mask_t); 119 rc = sclp_cmd_sync_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); 120 } while (rc == -EBUSY); 121 } 122 123 void __init sclp_facilities_detect(void) 124 { 125 struct read_info_sccb *sccb; 126 127 sclp_read_info_early(); 128 if (!early_read_info_sccb_valid) 129 return; 130 131 sccb = &early_read_info_sccb; 132 sclp_facilities = sccb->facilities; 133 sclp_fac84 = sccb->fac84; 134 sclp_fac85 = sccb->fac85; 135 rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 136 rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 137 rzm <<= 20; 138 139 sclp_event_mask_early(); 140 } 141 142 bool __init sclp_has_linemode(void) 143 { 144 struct init_sccb *sccb = &early_event_mask_sccb; 145 146 if (sccb->header.response_code != 0x20) 147 return 0; 148 if (sccb->sclp_send_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)) 149 return 1; 150 return 0; 151 } 152 153 bool __init sclp_has_vt220(void) 154 { 155 struct init_sccb *sccb = &early_event_mask_sccb; 156 157 if (sccb->header.response_code != 0x20) 158 return 0; 159 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) 160 return 1; 161 return 0; 162 } 163 164 unsigned long long sclp_get_rnmax(void) 165 { 166 return rnmax; 167 } 168 169 unsigned long long sclp_get_rzm(void) 170 { 171 return rzm; 172 } 173 174 u8 sclp_get_fac85(void) 175 { 176 return sclp_fac85; 177 } 178 EXPORT_SYMBOL_GPL(sclp_get_fac85); 179 180 /* 181 * This function will be called after sclp_facilities_detect(), which gets 182 * called from early.c code. Therefore the sccb should have valid contents. 183 */ 184 void __init sclp_get_ipl_info(struct sclp_ipl_info *info) 185 { 186 struct read_info_sccb *sccb; 187 188 if (!early_read_info_sccb_valid) 189 return; 190 sccb = &early_read_info_sccb; 191 info->is_valid = 1; 192 if (sccb->flags & 0x2) 193 info->has_dump = 1; 194 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN); 195 } 196 197 static void sclp_sync_callback(struct sclp_req *req, void *data) 198 { 199 struct completion *completion = data; 200 201 complete(completion); 202 } 203 204 static int do_sync_request(sclp_cmdw_t cmd, void *sccb) 205 { 206 struct completion completion; 207 struct sclp_req *request; 208 int rc; 209 210 request = kzalloc(sizeof(*request), GFP_KERNEL); 211 if (!request) 212 return -ENOMEM; 213 request->command = cmd; 214 request->sccb = sccb; 215 request->status = SCLP_REQ_FILLED; 216 request->callback = sclp_sync_callback; 217 request->callback_data = &completion; 218 init_completion(&completion); 219 220 /* Perform sclp request. */ 221 rc = sclp_add_request(request); 222 if (rc) 223 goto out; 224 wait_for_completion(&completion); 225 226 /* Check response. */ 227 if (request->status != SCLP_REQ_DONE) { 228 pr_warning("sync request failed (cmd=0x%08x, " 229 "status=0x%02x)\n", cmd, request->status); 230 rc = -EIO; 231 } 232 out: 233 kfree(request); 234 return rc; 235 } 236 237 /* 238 * CPU configuration related functions. 239 */ 240 241 #define SCLP_CMDW_READ_CPU_INFO 0x00010001 242 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001 243 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001 244 245 struct read_cpu_info_sccb { 246 struct sccb_header header; 247 u16 nr_configured; 248 u16 offset_configured; 249 u16 nr_standby; 250 u16 offset_standby; 251 u8 reserved[4096 - 16]; 252 } __attribute__((packed, aligned(PAGE_SIZE))); 253 254 static void sclp_fill_cpu_info(struct sclp_cpu_info *info, 255 struct read_cpu_info_sccb *sccb) 256 { 257 char *page = (char *) sccb; 258 259 memset(info, 0, sizeof(*info)); 260 info->configured = sccb->nr_configured; 261 info->standby = sccb->nr_standby; 262 info->combined = sccb->nr_configured + sccb->nr_standby; 263 info->has_cpu_type = sclp_fac84 & 0x1; 264 memcpy(&info->cpu, page + sccb->offset_configured, 265 info->combined * sizeof(struct sclp_cpu_entry)); 266 } 267 268 int sclp_get_cpu_info(struct sclp_cpu_info *info) 269 { 270 int rc; 271 struct read_cpu_info_sccb *sccb; 272 273 if (!SCLP_HAS_CPU_INFO) 274 return -EOPNOTSUPP; 275 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 276 if (!sccb) 277 return -ENOMEM; 278 sccb->header.length = sizeof(*sccb); 279 rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb); 280 if (rc) 281 goto out; 282 if (sccb->header.response_code != 0x0010) { 283 pr_warning("readcpuinfo failed (response=0x%04x)\n", 284 sccb->header.response_code); 285 rc = -EIO; 286 goto out; 287 } 288 sclp_fill_cpu_info(info, sccb); 289 out: 290 free_page((unsigned long) sccb); 291 return rc; 292 } 293 294 struct cpu_configure_sccb { 295 struct sccb_header header; 296 } __attribute__((packed, aligned(8))); 297 298 static int do_cpu_configure(sclp_cmdw_t cmd) 299 { 300 struct cpu_configure_sccb *sccb; 301 int rc; 302 303 if (!SCLP_HAS_CPU_RECONFIG) 304 return -EOPNOTSUPP; 305 /* 306 * This is not going to cross a page boundary since we force 307 * kmalloc to have a minimum alignment of 8 bytes on s390. 308 */ 309 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); 310 if (!sccb) 311 return -ENOMEM; 312 sccb->header.length = sizeof(*sccb); 313 rc = do_sync_request(cmd, sccb); 314 if (rc) 315 goto out; 316 switch (sccb->header.response_code) { 317 case 0x0020: 318 case 0x0120: 319 break; 320 default: 321 pr_warning("configure cpu failed (cmd=0x%08x, " 322 "response=0x%04x)\n", cmd, 323 sccb->header.response_code); 324 rc = -EIO; 325 break; 326 } 327 out: 328 kfree(sccb); 329 return rc; 330 } 331 332 int sclp_cpu_configure(u8 cpu) 333 { 334 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8); 335 } 336 337 int sclp_cpu_deconfigure(u8 cpu) 338 { 339 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8); 340 } 341 342 #ifdef CONFIG_MEMORY_HOTPLUG 343 344 static DEFINE_MUTEX(sclp_mem_mutex); 345 static LIST_HEAD(sclp_mem_list); 346 static u8 sclp_max_storage_id; 347 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG]; 348 static int sclp_mem_state_changed; 349 350 struct memory_increment { 351 struct list_head list; 352 u16 rn; 353 int standby; 354 int usecount; 355 }; 356 357 struct assign_storage_sccb { 358 struct sccb_header header; 359 u16 rn; 360 } __packed; 361 362 int arch_get_memory_phys_device(unsigned long start_pfn) 363 { 364 if (!rzm) 365 return 0; 366 return PFN_PHYS(start_pfn) >> ilog2(rzm); 367 } 368 369 static unsigned long long rn2addr(u16 rn) 370 { 371 return (unsigned long long) (rn - 1) * rzm; 372 } 373 374 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) 375 { 376 struct assign_storage_sccb *sccb; 377 int rc; 378 379 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 380 if (!sccb) 381 return -ENOMEM; 382 sccb->header.length = PAGE_SIZE; 383 sccb->rn = rn; 384 rc = do_sync_request(cmd, sccb); 385 if (rc) 386 goto out; 387 switch (sccb->header.response_code) { 388 case 0x0020: 389 case 0x0120: 390 break; 391 default: 392 pr_warning("assign storage failed (cmd=0x%08x, " 393 "response=0x%04x, rn=0x%04x)\n", cmd, 394 sccb->header.response_code, rn); 395 rc = -EIO; 396 break; 397 } 398 out: 399 free_page((unsigned long) sccb); 400 return rc; 401 } 402 403 static int sclp_assign_storage(u16 rn) 404 { 405 unsigned long long start; 406 int rc; 407 408 rc = do_assign_storage(0x000d0001, rn); 409 if (rc) 410 return rc; 411 start = rn2addr(rn); 412 storage_key_init_range(start, start + rzm); 413 return 0; 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 * PCI I/O adapter configuration related functions. 706 */ 707 #define SCLP_CMDW_CONFIGURE_PCI 0x001a0001 708 #define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001 709 710 #define SCLP_RECONFIG_PCI_ATPYE 2 711 712 struct pci_cfg_sccb { 713 struct sccb_header header; 714 u8 atype; /* adapter type */ 715 u8 reserved1; 716 u16 reserved2; 717 u32 aid; /* adapter identifier */ 718 } __packed; 719 720 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid) 721 { 722 struct pci_cfg_sccb *sccb; 723 int rc; 724 725 if (!SCLP_HAS_PCI_RECONFIG) 726 return -EOPNOTSUPP; 727 728 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 729 if (!sccb) 730 return -ENOMEM; 731 732 sccb->header.length = PAGE_SIZE; 733 sccb->atype = SCLP_RECONFIG_PCI_ATPYE; 734 sccb->aid = fid; 735 rc = do_sync_request(cmd, sccb); 736 if (rc) 737 goto out; 738 switch (sccb->header.response_code) { 739 case 0x0020: 740 case 0x0120: 741 break; 742 default: 743 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n", 744 cmd, sccb->header.response_code); 745 rc = -EIO; 746 break; 747 } 748 out: 749 free_page((unsigned long) sccb); 750 return rc; 751 } 752 753 int sclp_pci_configure(u32 fid) 754 { 755 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid); 756 } 757 EXPORT_SYMBOL(sclp_pci_configure); 758 759 int sclp_pci_deconfigure(u32 fid) 760 { 761 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid); 762 } 763 EXPORT_SYMBOL(sclp_pci_deconfigure); 764 765 /* 766 * Channel path configuration related functions. 767 */ 768 769 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 770 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 771 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 772 773 struct chp_cfg_sccb { 774 struct sccb_header header; 775 u8 ccm; 776 u8 reserved[6]; 777 u8 cssid; 778 } __attribute__((packed)); 779 780 static int do_chp_configure(sclp_cmdw_t cmd) 781 { 782 struct chp_cfg_sccb *sccb; 783 int rc; 784 785 if (!SCLP_HAS_CHP_RECONFIG) 786 return -EOPNOTSUPP; 787 /* Prepare sccb. */ 788 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 789 if (!sccb) 790 return -ENOMEM; 791 sccb->header.length = sizeof(*sccb); 792 rc = do_sync_request(cmd, sccb); 793 if (rc) 794 goto out; 795 switch (sccb->header.response_code) { 796 case 0x0020: 797 case 0x0120: 798 case 0x0440: 799 case 0x0450: 800 break; 801 default: 802 pr_warning("configure channel-path failed " 803 "(cmd=0x%08x, response=0x%04x)\n", cmd, 804 sccb->header.response_code); 805 rc = -EIO; 806 break; 807 } 808 out: 809 free_page((unsigned long) sccb); 810 return rc; 811 } 812 813 /** 814 * sclp_chp_configure - perform configure channel-path sclp command 815 * @chpid: channel-path ID 816 * 817 * Perform configure channel-path command sclp command for specified chpid. 818 * Return 0 after command successfully finished, non-zero otherwise. 819 */ 820 int sclp_chp_configure(struct chp_id chpid) 821 { 822 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); 823 } 824 825 /** 826 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command 827 * @chpid: channel-path ID 828 * 829 * Perform deconfigure channel-path command sclp command for specified chpid 830 * and wait for completion. On success return 0. Return non-zero otherwise. 831 */ 832 int sclp_chp_deconfigure(struct chp_id chpid) 833 { 834 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); 835 } 836 837 struct chp_info_sccb { 838 struct sccb_header header; 839 u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; 840 u8 standby[SCLP_CHP_INFO_MASK_SIZE]; 841 u8 configured[SCLP_CHP_INFO_MASK_SIZE]; 842 u8 ccm; 843 u8 reserved[6]; 844 u8 cssid; 845 } __attribute__((packed)); 846 847 /** 848 * sclp_chp_read_info - perform read channel-path information sclp command 849 * @info: resulting channel-path information data 850 * 851 * Perform read channel-path information sclp command and wait for completion. 852 * On success, store channel-path information in @info and return 0. Return 853 * non-zero otherwise. 854 */ 855 int sclp_chp_read_info(struct sclp_chp_info *info) 856 { 857 struct chp_info_sccb *sccb; 858 int rc; 859 860 if (!SCLP_HAS_CHP_INFO) 861 return -EOPNOTSUPP; 862 /* Prepare sccb. */ 863 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 864 if (!sccb) 865 return -ENOMEM; 866 sccb->header.length = sizeof(*sccb); 867 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); 868 if (rc) 869 goto out; 870 if (sccb->header.response_code != 0x0010) { 871 pr_warning("read channel-path info failed " 872 "(response=0x%04x)\n", sccb->header.response_code); 873 rc = -EIO; 874 goto out; 875 } 876 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); 877 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); 878 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); 879 out: 880 free_page((unsigned long) sccb); 881 return rc; 882 } 883