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 unsigned long long rzm; 60 static unsigned long long rnmax; 61 62 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) 63 { 64 int rc; 65 66 __ctl_set_bit(0, 9); 67 rc = sclp_service_call(cmd, sccb); 68 if (rc) 69 goto out; 70 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | 71 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); 72 local_irq_disable(); 73 out: 74 /* Contents of the sccb might have changed. */ 75 barrier(); 76 __ctl_clear_bit(0, 9); 77 return rc; 78 } 79 80 static void __init sclp_read_info_early(void) 81 { 82 int rc; 83 int i; 84 struct read_info_sccb *sccb; 85 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, 86 SCLP_CMDW_READ_SCP_INFO}; 87 88 sccb = &early_read_info_sccb; 89 for (i = 0; i < ARRAY_SIZE(commands); i++) { 90 do { 91 memset(sccb, 0, sizeof(*sccb)); 92 sccb->header.length = sizeof(*sccb); 93 sccb->header.function_code = 0x80; 94 sccb->header.control_mask[2] = 0x80; 95 rc = sclp_cmd_sync_early(commands[i], sccb); 96 } while (rc == -EBUSY); 97 98 if (rc) 99 break; 100 if (sccb->header.response_code == 0x10) { 101 early_read_info_sccb_valid = 1; 102 break; 103 } 104 if (sccb->header.response_code != 0x1f0) 105 break; 106 } 107 } 108 109 static void __init sclp_event_mask_early(void) 110 { 111 struct init_sccb *sccb = &early_event_mask_sccb; 112 int rc; 113 114 do { 115 memset(sccb, 0, sizeof(*sccb)); 116 sccb->header.length = sizeof(*sccb); 117 sccb->mask_length = sizeof(sccb_mask_t); 118 rc = sclp_cmd_sync_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); 119 } while (rc == -EBUSY); 120 } 121 122 void __init sclp_facilities_detect(void) 123 { 124 struct read_info_sccb *sccb; 125 126 sclp_read_info_early(); 127 if (!early_read_info_sccb_valid) 128 return; 129 130 sccb = &early_read_info_sccb; 131 sclp_facilities = sccb->facilities; 132 sclp_fac84 = sccb->fac84; 133 if (sccb->fac85 & 0x02) 134 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 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 /* 175 * This function will be called after sclp_facilities_detect(), which gets 176 * called from early.c code. Therefore the sccb should have valid contents. 177 */ 178 void __init sclp_get_ipl_info(struct sclp_ipl_info *info) 179 { 180 struct read_info_sccb *sccb; 181 182 if (!early_read_info_sccb_valid) 183 return; 184 sccb = &early_read_info_sccb; 185 info->is_valid = 1; 186 if (sccb->flags & 0x2) 187 info->has_dump = 1; 188 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN); 189 } 190 191 static void sclp_sync_callback(struct sclp_req *req, void *data) 192 { 193 struct completion *completion = data; 194 195 complete(completion); 196 } 197 198 static int do_sync_request(sclp_cmdw_t cmd, void *sccb) 199 { 200 struct completion completion; 201 struct sclp_req *request; 202 int rc; 203 204 request = kzalloc(sizeof(*request), GFP_KERNEL); 205 if (!request) 206 return -ENOMEM; 207 request->command = cmd; 208 request->sccb = sccb; 209 request->status = SCLP_REQ_FILLED; 210 request->callback = sclp_sync_callback; 211 request->callback_data = &completion; 212 init_completion(&completion); 213 214 /* Perform sclp request. */ 215 rc = sclp_add_request(request); 216 if (rc) 217 goto out; 218 wait_for_completion(&completion); 219 220 /* Check response. */ 221 if (request->status != SCLP_REQ_DONE) { 222 pr_warning("sync request failed (cmd=0x%08x, " 223 "status=0x%02x)\n", cmd, request->status); 224 rc = -EIO; 225 } 226 out: 227 kfree(request); 228 return rc; 229 } 230 231 /* 232 * CPU configuration related functions. 233 */ 234 235 #define SCLP_CMDW_READ_CPU_INFO 0x00010001 236 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001 237 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001 238 239 struct read_cpu_info_sccb { 240 struct sccb_header header; 241 u16 nr_configured; 242 u16 offset_configured; 243 u16 nr_standby; 244 u16 offset_standby; 245 u8 reserved[4096 - 16]; 246 } __attribute__((packed, aligned(PAGE_SIZE))); 247 248 static void sclp_fill_cpu_info(struct sclp_cpu_info *info, 249 struct read_cpu_info_sccb *sccb) 250 { 251 char *page = (char *) sccb; 252 253 memset(info, 0, sizeof(*info)); 254 info->configured = sccb->nr_configured; 255 info->standby = sccb->nr_standby; 256 info->combined = sccb->nr_configured + sccb->nr_standby; 257 info->has_cpu_type = sclp_fac84 & 0x1; 258 memcpy(&info->cpu, page + sccb->offset_configured, 259 info->combined * sizeof(struct sclp_cpu_entry)); 260 } 261 262 int sclp_get_cpu_info(struct sclp_cpu_info *info) 263 { 264 int rc; 265 struct read_cpu_info_sccb *sccb; 266 267 if (!SCLP_HAS_CPU_INFO) 268 return -EOPNOTSUPP; 269 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 270 if (!sccb) 271 return -ENOMEM; 272 sccb->header.length = sizeof(*sccb); 273 rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb); 274 if (rc) 275 goto out; 276 if (sccb->header.response_code != 0x0010) { 277 pr_warning("readcpuinfo failed (response=0x%04x)\n", 278 sccb->header.response_code); 279 rc = -EIO; 280 goto out; 281 } 282 sclp_fill_cpu_info(info, sccb); 283 out: 284 free_page((unsigned long) sccb); 285 return rc; 286 } 287 288 struct cpu_configure_sccb { 289 struct sccb_header header; 290 } __attribute__((packed, aligned(8))); 291 292 static int do_cpu_configure(sclp_cmdw_t cmd) 293 { 294 struct cpu_configure_sccb *sccb; 295 int rc; 296 297 if (!SCLP_HAS_CPU_RECONFIG) 298 return -EOPNOTSUPP; 299 /* 300 * This is not going to cross a page boundary since we force 301 * kmalloc to have a minimum alignment of 8 bytes on s390. 302 */ 303 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); 304 if (!sccb) 305 return -ENOMEM; 306 sccb->header.length = sizeof(*sccb); 307 rc = do_sync_request(cmd, sccb); 308 if (rc) 309 goto out; 310 switch (sccb->header.response_code) { 311 case 0x0020: 312 case 0x0120: 313 break; 314 default: 315 pr_warning("configure cpu failed (cmd=0x%08x, " 316 "response=0x%04x)\n", cmd, 317 sccb->header.response_code); 318 rc = -EIO; 319 break; 320 } 321 out: 322 kfree(sccb); 323 return rc; 324 } 325 326 int sclp_cpu_configure(u8 cpu) 327 { 328 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8); 329 } 330 331 int sclp_cpu_deconfigure(u8 cpu) 332 { 333 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8); 334 } 335 336 #ifdef CONFIG_MEMORY_HOTPLUG 337 338 static DEFINE_MUTEX(sclp_mem_mutex); 339 static LIST_HEAD(sclp_mem_list); 340 static u8 sclp_max_storage_id; 341 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG]; 342 static int sclp_mem_state_changed; 343 344 struct memory_increment { 345 struct list_head list; 346 u16 rn; 347 int standby; 348 int usecount; 349 }; 350 351 struct assign_storage_sccb { 352 struct sccb_header header; 353 u16 rn; 354 } __packed; 355 356 int arch_get_memory_phys_device(unsigned long start_pfn) 357 { 358 if (!rzm) 359 return 0; 360 return PFN_PHYS(start_pfn) >> ilog2(rzm); 361 } 362 363 static unsigned long long rn2addr(u16 rn) 364 { 365 return (unsigned long long) (rn - 1) * rzm; 366 } 367 368 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) 369 { 370 struct assign_storage_sccb *sccb; 371 int rc; 372 373 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 374 if (!sccb) 375 return -ENOMEM; 376 sccb->header.length = PAGE_SIZE; 377 sccb->rn = rn; 378 rc = do_sync_request(cmd, sccb); 379 if (rc) 380 goto out; 381 switch (sccb->header.response_code) { 382 case 0x0020: 383 case 0x0120: 384 break; 385 default: 386 pr_warning("assign storage failed (cmd=0x%08x, " 387 "response=0x%04x, rn=0x%04x)\n", cmd, 388 sccb->header.response_code, rn); 389 rc = -EIO; 390 break; 391 } 392 out: 393 free_page((unsigned long) sccb); 394 return rc; 395 } 396 397 static int sclp_assign_storage(u16 rn) 398 { 399 unsigned long long start; 400 int rc; 401 402 rc = do_assign_storage(0x000d0001, rn); 403 if (rc) 404 return rc; 405 start = rn2addr(rn); 406 storage_key_init_range(start, start + rzm); 407 return 0; 408 } 409 410 static int sclp_unassign_storage(u16 rn) 411 { 412 return do_assign_storage(0x000c0001, rn); 413 } 414 415 struct attach_storage_sccb { 416 struct sccb_header header; 417 u16 :16; 418 u16 assigned; 419 u32 :32; 420 u32 entries[0]; 421 } __packed; 422 423 static int sclp_attach_storage(u8 id) 424 { 425 struct attach_storage_sccb *sccb; 426 int rc; 427 int i; 428 429 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 430 if (!sccb) 431 return -ENOMEM; 432 sccb->header.length = PAGE_SIZE; 433 rc = do_sync_request(0x00080001 | id << 8, sccb); 434 if (rc) 435 goto out; 436 switch (sccb->header.response_code) { 437 case 0x0020: 438 set_bit(id, sclp_storage_ids); 439 for (i = 0; i < sccb->assigned; i++) { 440 if (sccb->entries[i]) 441 sclp_unassign_storage(sccb->entries[i] >> 16); 442 } 443 break; 444 default: 445 rc = -EIO; 446 break; 447 } 448 out: 449 free_page((unsigned long) sccb); 450 return rc; 451 } 452 453 static int sclp_mem_change_state(unsigned long start, unsigned long size, 454 int online) 455 { 456 struct memory_increment *incr; 457 unsigned long long istart; 458 int rc = 0; 459 460 list_for_each_entry(incr, &sclp_mem_list, list) { 461 istart = rn2addr(incr->rn); 462 if (start + size - 1 < istart) 463 break; 464 if (start > istart + rzm - 1) 465 continue; 466 if (online) { 467 if (incr->usecount++) 468 continue; 469 /* 470 * Don't break the loop if one assign fails. Loop may 471 * be walked again on CANCEL and we can't save 472 * information if state changed before or not. 473 * So continue and increase usecount for all increments. 474 */ 475 rc |= sclp_assign_storage(incr->rn); 476 } else { 477 if (--incr->usecount) 478 continue; 479 sclp_unassign_storage(incr->rn); 480 } 481 } 482 return rc ? -EIO : 0; 483 } 484 485 static int sclp_mem_notifier(struct notifier_block *nb, 486 unsigned long action, void *data) 487 { 488 unsigned long start, size; 489 struct memory_notify *arg; 490 unsigned char id; 491 int rc = 0; 492 493 arg = data; 494 start = arg->start_pfn << PAGE_SHIFT; 495 size = arg->nr_pages << PAGE_SHIFT; 496 mutex_lock(&sclp_mem_mutex); 497 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1) 498 sclp_attach_storage(id); 499 switch (action) { 500 case MEM_ONLINE: 501 case MEM_GOING_OFFLINE: 502 case MEM_CANCEL_OFFLINE: 503 break; 504 case MEM_GOING_ONLINE: 505 rc = sclp_mem_change_state(start, size, 1); 506 break; 507 case MEM_CANCEL_ONLINE: 508 sclp_mem_change_state(start, size, 0); 509 break; 510 case MEM_OFFLINE: 511 sclp_mem_change_state(start, size, 0); 512 break; 513 default: 514 rc = -EINVAL; 515 break; 516 } 517 if (!rc) 518 sclp_mem_state_changed = 1; 519 mutex_unlock(&sclp_mem_mutex); 520 return rc ? NOTIFY_BAD : NOTIFY_OK; 521 } 522 523 static struct notifier_block sclp_mem_nb = { 524 .notifier_call = sclp_mem_notifier, 525 }; 526 527 static void __init add_memory_merged(u16 rn) 528 { 529 static u16 first_rn, num; 530 unsigned long long start, size; 531 532 if (rn && first_rn && (first_rn + num == rn)) { 533 num++; 534 return; 535 } 536 if (!first_rn) 537 goto skip_add; 538 start = rn2addr(first_rn); 539 size = (unsigned long long ) num * rzm; 540 if (start >= VMEM_MAX_PHYS) 541 goto skip_add; 542 if (start + size > VMEM_MAX_PHYS) 543 size = VMEM_MAX_PHYS - start; 544 if (memory_end_set && (start >= memory_end)) 545 goto skip_add; 546 if (memory_end_set && (start + size > memory_end)) 547 size = memory_end - start; 548 add_memory(0, start, size); 549 skip_add: 550 first_rn = rn; 551 num = 1; 552 } 553 554 static void __init sclp_add_standby_memory(void) 555 { 556 struct memory_increment *incr; 557 558 list_for_each_entry(incr, &sclp_mem_list, list) 559 if (incr->standby) 560 add_memory_merged(incr->rn); 561 add_memory_merged(0); 562 } 563 564 static void __init insert_increment(u16 rn, int standby, int assigned) 565 { 566 struct memory_increment *incr, *new_incr; 567 struct list_head *prev; 568 u16 last_rn; 569 570 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); 571 if (!new_incr) 572 return; 573 new_incr->rn = rn; 574 new_incr->standby = standby; 575 if (!standby) 576 new_incr->usecount = 1; 577 last_rn = 0; 578 prev = &sclp_mem_list; 579 list_for_each_entry(incr, &sclp_mem_list, list) { 580 if (assigned && incr->rn > rn) 581 break; 582 if (!assigned && incr->rn - last_rn > 1) 583 break; 584 last_rn = incr->rn; 585 prev = &incr->list; 586 } 587 if (!assigned) 588 new_incr->rn = last_rn + 1; 589 if (new_incr->rn > rnmax) { 590 kfree(new_incr); 591 return; 592 } 593 list_add(&new_incr->list, prev); 594 } 595 596 static int sclp_mem_freeze(struct device *dev) 597 { 598 if (!sclp_mem_state_changed) 599 return 0; 600 pr_err("Memory hotplug state changed, suspend refused.\n"); 601 return -EPERM; 602 } 603 604 struct read_storage_sccb { 605 struct sccb_header header; 606 u16 max_id; 607 u16 assigned; 608 u16 standby; 609 u16 :16; 610 u32 entries[0]; 611 } __packed; 612 613 static const struct dev_pm_ops sclp_mem_pm_ops = { 614 .freeze = sclp_mem_freeze, 615 }; 616 617 static struct platform_driver sclp_mem_pdrv = { 618 .driver = { 619 .name = "sclp_mem", 620 .pm = &sclp_mem_pm_ops, 621 }, 622 }; 623 624 static int __init sclp_detect_standby_memory(void) 625 { 626 struct platform_device *sclp_pdev; 627 struct read_storage_sccb *sccb; 628 int i, id, assigned, rc; 629 630 if (!early_read_info_sccb_valid) 631 return 0; 632 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL) 633 return 0; 634 rc = -ENOMEM; 635 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA); 636 if (!sccb) 637 goto out; 638 assigned = 0; 639 for (id = 0; id <= sclp_max_storage_id; id++) { 640 memset(sccb, 0, PAGE_SIZE); 641 sccb->header.length = PAGE_SIZE; 642 rc = do_sync_request(0x00040001 | id << 8, sccb); 643 if (rc) 644 goto out; 645 switch (sccb->header.response_code) { 646 case 0x0010: 647 set_bit(id, sclp_storage_ids); 648 for (i = 0; i < sccb->assigned; i++) { 649 if (!sccb->entries[i]) 650 continue; 651 assigned++; 652 insert_increment(sccb->entries[i] >> 16, 0, 1); 653 } 654 break; 655 case 0x0310: 656 break; 657 case 0x0410: 658 for (i = 0; i < sccb->assigned; i++) { 659 if (!sccb->entries[i]) 660 continue; 661 assigned++; 662 insert_increment(sccb->entries[i] >> 16, 1, 1); 663 } 664 break; 665 default: 666 rc = -EIO; 667 break; 668 } 669 if (!rc) 670 sclp_max_storage_id = sccb->max_id; 671 } 672 if (rc || list_empty(&sclp_mem_list)) 673 goto out; 674 for (i = 1; i <= rnmax - assigned; i++) 675 insert_increment(0, 1, 0); 676 rc = register_memory_notifier(&sclp_mem_nb); 677 if (rc) 678 goto out; 679 rc = platform_driver_register(&sclp_mem_pdrv); 680 if (rc) 681 goto out; 682 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0); 683 rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0; 684 if (rc) 685 goto out_driver; 686 sclp_add_standby_memory(); 687 goto out; 688 out_driver: 689 platform_driver_unregister(&sclp_mem_pdrv); 690 out: 691 free_page((unsigned long) sccb); 692 return rc; 693 } 694 __initcall(sclp_detect_standby_memory); 695 696 #endif /* CONFIG_MEMORY_HOTPLUG */ 697 698 /* 699 * PCI I/O adapter configuration related functions. 700 */ 701 #define SCLP_CMDW_CONFIGURE_PCI 0x001a0001 702 #define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001 703 704 #define SCLP_RECONFIG_PCI_ATPYE 2 705 706 struct pci_cfg_sccb { 707 struct sccb_header header; 708 u8 atype; /* adapter type */ 709 u8 reserved1; 710 u16 reserved2; 711 u32 aid; /* adapter identifier */ 712 } __packed; 713 714 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid) 715 { 716 struct pci_cfg_sccb *sccb; 717 int rc; 718 719 if (!SCLP_HAS_PCI_RECONFIG) 720 return -EOPNOTSUPP; 721 722 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 723 if (!sccb) 724 return -ENOMEM; 725 726 sccb->header.length = PAGE_SIZE; 727 sccb->atype = SCLP_RECONFIG_PCI_ATPYE; 728 sccb->aid = fid; 729 rc = do_sync_request(cmd, sccb); 730 if (rc) 731 goto out; 732 switch (sccb->header.response_code) { 733 case 0x0020: 734 case 0x0120: 735 break; 736 default: 737 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n", 738 cmd, sccb->header.response_code); 739 rc = -EIO; 740 break; 741 } 742 out: 743 free_page((unsigned long) sccb); 744 return rc; 745 } 746 747 int sclp_pci_configure(u32 fid) 748 { 749 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid); 750 } 751 EXPORT_SYMBOL(sclp_pci_configure); 752 753 int sclp_pci_deconfigure(u32 fid) 754 { 755 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid); 756 } 757 EXPORT_SYMBOL(sclp_pci_deconfigure); 758 759 /* 760 * Channel path configuration related functions. 761 */ 762 763 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 764 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 765 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 766 767 struct chp_cfg_sccb { 768 struct sccb_header header; 769 u8 ccm; 770 u8 reserved[6]; 771 u8 cssid; 772 } __attribute__((packed)); 773 774 static int do_chp_configure(sclp_cmdw_t cmd) 775 { 776 struct chp_cfg_sccb *sccb; 777 int rc; 778 779 if (!SCLP_HAS_CHP_RECONFIG) 780 return -EOPNOTSUPP; 781 /* Prepare sccb. */ 782 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 783 if (!sccb) 784 return -ENOMEM; 785 sccb->header.length = sizeof(*sccb); 786 rc = do_sync_request(cmd, sccb); 787 if (rc) 788 goto out; 789 switch (sccb->header.response_code) { 790 case 0x0020: 791 case 0x0120: 792 case 0x0440: 793 case 0x0450: 794 break; 795 default: 796 pr_warning("configure channel-path failed " 797 "(cmd=0x%08x, response=0x%04x)\n", cmd, 798 sccb->header.response_code); 799 rc = -EIO; 800 break; 801 } 802 out: 803 free_page((unsigned long) sccb); 804 return rc; 805 } 806 807 /** 808 * sclp_chp_configure - perform configure channel-path sclp command 809 * @chpid: channel-path ID 810 * 811 * Perform configure channel-path command sclp command for specified chpid. 812 * Return 0 after command successfully finished, non-zero otherwise. 813 */ 814 int sclp_chp_configure(struct chp_id chpid) 815 { 816 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); 817 } 818 819 /** 820 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command 821 * @chpid: channel-path ID 822 * 823 * Perform deconfigure channel-path command sclp command for specified chpid 824 * and wait for completion. On success return 0. Return non-zero otherwise. 825 */ 826 int sclp_chp_deconfigure(struct chp_id chpid) 827 { 828 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); 829 } 830 831 struct chp_info_sccb { 832 struct sccb_header header; 833 u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; 834 u8 standby[SCLP_CHP_INFO_MASK_SIZE]; 835 u8 configured[SCLP_CHP_INFO_MASK_SIZE]; 836 u8 ccm; 837 u8 reserved[6]; 838 u8 cssid; 839 } __attribute__((packed)); 840 841 /** 842 * sclp_chp_read_info - perform read channel-path information sclp command 843 * @info: resulting channel-path information data 844 * 845 * Perform read channel-path information sclp command and wait for completion. 846 * On success, store channel-path information in @info and return 0. Return 847 * non-zero otherwise. 848 */ 849 int sclp_chp_read_info(struct sclp_chp_info *info) 850 { 851 struct chp_info_sccb *sccb; 852 int rc; 853 854 if (!SCLP_HAS_CHP_INFO) 855 return -EOPNOTSUPP; 856 /* Prepare sccb. */ 857 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 858 if (!sccb) 859 return -ENOMEM; 860 sccb->header.length = sizeof(*sccb); 861 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); 862 if (rc) 863 goto out; 864 if (sccb->header.response_code != 0x0010) { 865 pr_warning("read channel-path info failed " 866 "(response=0x%04x)\n", sccb->header.response_code); 867 rc = -EIO; 868 goto out; 869 } 870 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); 871 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); 872 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); 873 out: 874 free_page((unsigned long) sccb); 875 return rc; 876 } 877