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 int sclp_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 = sclp_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 = sclp_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 }; 349 350 struct assign_storage_sccb { 351 struct sccb_header header; 352 u16 rn; 353 } __packed; 354 355 int arch_get_memory_phys_device(unsigned long start_pfn) 356 { 357 if (!rzm) 358 return 0; 359 return PFN_PHYS(start_pfn) >> ilog2(rzm); 360 } 361 362 static unsigned long long rn2addr(u16 rn) 363 { 364 return (unsigned long long) (rn - 1) * rzm; 365 } 366 367 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) 368 { 369 struct assign_storage_sccb *sccb; 370 int rc; 371 372 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 373 if (!sccb) 374 return -ENOMEM; 375 sccb->header.length = PAGE_SIZE; 376 sccb->rn = rn; 377 rc = sclp_sync_request(cmd, sccb); 378 if (rc) 379 goto out; 380 switch (sccb->header.response_code) { 381 case 0x0020: 382 case 0x0120: 383 break; 384 default: 385 pr_warning("assign storage failed (cmd=0x%08x, " 386 "response=0x%04x, rn=0x%04x)\n", cmd, 387 sccb->header.response_code, rn); 388 rc = -EIO; 389 break; 390 } 391 out: 392 free_page((unsigned long) sccb); 393 return rc; 394 } 395 396 static int sclp_assign_storage(u16 rn) 397 { 398 unsigned long long start; 399 int rc; 400 401 rc = do_assign_storage(0x000d0001, rn); 402 if (rc) 403 return rc; 404 start = rn2addr(rn); 405 storage_key_init_range(start, start + rzm); 406 return 0; 407 } 408 409 static int sclp_unassign_storage(u16 rn) 410 { 411 return do_assign_storage(0x000c0001, rn); 412 } 413 414 struct attach_storage_sccb { 415 struct sccb_header header; 416 u16 :16; 417 u16 assigned; 418 u32 :32; 419 u32 entries[0]; 420 } __packed; 421 422 static int sclp_attach_storage(u8 id) 423 { 424 struct attach_storage_sccb *sccb; 425 int rc; 426 int i; 427 428 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 429 if (!sccb) 430 return -ENOMEM; 431 sccb->header.length = PAGE_SIZE; 432 rc = sclp_sync_request(0x00080001 | id << 8, sccb); 433 if (rc) 434 goto out; 435 switch (sccb->header.response_code) { 436 case 0x0020: 437 set_bit(id, sclp_storage_ids); 438 for (i = 0; i < sccb->assigned; i++) { 439 if (sccb->entries[i]) 440 sclp_unassign_storage(sccb->entries[i] >> 16); 441 } 442 break; 443 default: 444 rc = -EIO; 445 break; 446 } 447 out: 448 free_page((unsigned long) sccb); 449 return rc; 450 } 451 452 static int sclp_mem_change_state(unsigned long start, unsigned long size, 453 int online) 454 { 455 struct memory_increment *incr; 456 unsigned long long istart; 457 int rc = 0; 458 459 list_for_each_entry(incr, &sclp_mem_list, list) { 460 istart = rn2addr(incr->rn); 461 if (start + size - 1 < istart) 462 break; 463 if (start > istart + rzm - 1) 464 continue; 465 if (online) 466 rc |= sclp_assign_storage(incr->rn); 467 else 468 sclp_unassign_storage(incr->rn); 469 } 470 return rc ? -EIO : 0; 471 } 472 473 static int sclp_mem_notifier(struct notifier_block *nb, 474 unsigned long action, void *data) 475 { 476 unsigned long start, size; 477 struct memory_notify *arg; 478 unsigned char id; 479 int rc = 0; 480 481 arg = data; 482 start = arg->start_pfn << PAGE_SHIFT; 483 size = arg->nr_pages << PAGE_SHIFT; 484 mutex_lock(&sclp_mem_mutex); 485 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1) 486 sclp_attach_storage(id); 487 switch (action) { 488 case MEM_ONLINE: 489 case MEM_GOING_OFFLINE: 490 case MEM_CANCEL_OFFLINE: 491 break; 492 case MEM_GOING_ONLINE: 493 rc = sclp_mem_change_state(start, size, 1); 494 break; 495 case MEM_CANCEL_ONLINE: 496 sclp_mem_change_state(start, size, 0); 497 break; 498 case MEM_OFFLINE: 499 sclp_mem_change_state(start, size, 0); 500 break; 501 default: 502 rc = -EINVAL; 503 break; 504 } 505 if (!rc) 506 sclp_mem_state_changed = 1; 507 mutex_unlock(&sclp_mem_mutex); 508 return rc ? NOTIFY_BAD : NOTIFY_OK; 509 } 510 511 static struct notifier_block sclp_mem_nb = { 512 .notifier_call = sclp_mem_notifier, 513 }; 514 515 static void __init add_memory_merged(u16 rn) 516 { 517 static u16 first_rn, num; 518 unsigned long long start, size; 519 520 if (rn && first_rn && (first_rn + num == rn)) { 521 num++; 522 return; 523 } 524 if (!first_rn) 525 goto skip_add; 526 start = rn2addr(first_rn); 527 size = (unsigned long long ) num * rzm; 528 if (start >= VMEM_MAX_PHYS) 529 goto skip_add; 530 if (start + size > VMEM_MAX_PHYS) 531 size = VMEM_MAX_PHYS - start; 532 if (memory_end_set && (start >= memory_end)) 533 goto skip_add; 534 if (memory_end_set && (start + size > memory_end)) 535 size = memory_end - start; 536 add_memory(0, start, size); 537 skip_add: 538 first_rn = rn; 539 num = 1; 540 } 541 542 static void __init sclp_add_standby_memory(void) 543 { 544 struct memory_increment *incr; 545 546 list_for_each_entry(incr, &sclp_mem_list, list) 547 if (incr->standby) 548 add_memory_merged(incr->rn); 549 add_memory_merged(0); 550 } 551 552 static void __init insert_increment(u16 rn, int standby, int assigned) 553 { 554 struct memory_increment *incr, *new_incr; 555 struct list_head *prev; 556 u16 last_rn; 557 558 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); 559 if (!new_incr) 560 return; 561 new_incr->rn = rn; 562 new_incr->standby = standby; 563 last_rn = 0; 564 prev = &sclp_mem_list; 565 list_for_each_entry(incr, &sclp_mem_list, list) { 566 if (assigned && incr->rn > rn) 567 break; 568 if (!assigned && incr->rn - last_rn > 1) 569 break; 570 last_rn = incr->rn; 571 prev = &incr->list; 572 } 573 if (!assigned) 574 new_incr->rn = last_rn + 1; 575 if (new_incr->rn > rnmax) { 576 kfree(new_incr); 577 return; 578 } 579 list_add(&new_incr->list, prev); 580 } 581 582 static int sclp_mem_freeze(struct device *dev) 583 { 584 if (!sclp_mem_state_changed) 585 return 0; 586 pr_err("Memory hotplug state changed, suspend refused.\n"); 587 return -EPERM; 588 } 589 590 struct read_storage_sccb { 591 struct sccb_header header; 592 u16 max_id; 593 u16 assigned; 594 u16 standby; 595 u16 :16; 596 u32 entries[0]; 597 } __packed; 598 599 static const struct dev_pm_ops sclp_mem_pm_ops = { 600 .freeze = sclp_mem_freeze, 601 }; 602 603 static struct platform_driver sclp_mem_pdrv = { 604 .driver = { 605 .name = "sclp_mem", 606 .pm = &sclp_mem_pm_ops, 607 }, 608 }; 609 610 static int __init sclp_detect_standby_memory(void) 611 { 612 struct platform_device *sclp_pdev; 613 struct read_storage_sccb *sccb; 614 int i, id, assigned, rc; 615 616 if (OLDMEM_BASE) /* No standby memory in kdump mode */ 617 return 0; 618 if (!early_read_info_sccb_valid) 619 return 0; 620 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL) 621 return 0; 622 rc = -ENOMEM; 623 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA); 624 if (!sccb) 625 goto out; 626 assigned = 0; 627 for (id = 0; id <= sclp_max_storage_id; id++) { 628 memset(sccb, 0, PAGE_SIZE); 629 sccb->header.length = PAGE_SIZE; 630 rc = sclp_sync_request(0x00040001 | id << 8, sccb); 631 if (rc) 632 goto out; 633 switch (sccb->header.response_code) { 634 case 0x0010: 635 set_bit(id, sclp_storage_ids); 636 for (i = 0; i < sccb->assigned; i++) { 637 if (!sccb->entries[i]) 638 continue; 639 assigned++; 640 insert_increment(sccb->entries[i] >> 16, 0, 1); 641 } 642 break; 643 case 0x0310: 644 break; 645 case 0x0410: 646 for (i = 0; i < sccb->assigned; i++) { 647 if (!sccb->entries[i]) 648 continue; 649 assigned++; 650 insert_increment(sccb->entries[i] >> 16, 1, 1); 651 } 652 break; 653 default: 654 rc = -EIO; 655 break; 656 } 657 if (!rc) 658 sclp_max_storage_id = sccb->max_id; 659 } 660 if (rc || list_empty(&sclp_mem_list)) 661 goto out; 662 for (i = 1; i <= rnmax - assigned; i++) 663 insert_increment(0, 1, 0); 664 rc = register_memory_notifier(&sclp_mem_nb); 665 if (rc) 666 goto out; 667 rc = platform_driver_register(&sclp_mem_pdrv); 668 if (rc) 669 goto out; 670 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0); 671 rc = PTR_RET(sclp_pdev); 672 if (rc) 673 goto out_driver; 674 sclp_add_standby_memory(); 675 goto out; 676 out_driver: 677 platform_driver_unregister(&sclp_mem_pdrv); 678 out: 679 free_page((unsigned long) sccb); 680 return rc; 681 } 682 __initcall(sclp_detect_standby_memory); 683 684 #endif /* CONFIG_MEMORY_HOTPLUG */ 685 686 /* 687 * PCI I/O adapter configuration related functions. 688 */ 689 #define SCLP_CMDW_CONFIGURE_PCI 0x001a0001 690 #define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001 691 692 #define SCLP_RECONFIG_PCI_ATPYE 2 693 694 struct pci_cfg_sccb { 695 struct sccb_header header; 696 u8 atype; /* adapter type */ 697 u8 reserved1; 698 u16 reserved2; 699 u32 aid; /* adapter identifier */ 700 } __packed; 701 702 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid) 703 { 704 struct pci_cfg_sccb *sccb; 705 int rc; 706 707 if (!SCLP_HAS_PCI_RECONFIG) 708 return -EOPNOTSUPP; 709 710 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 711 if (!sccb) 712 return -ENOMEM; 713 714 sccb->header.length = PAGE_SIZE; 715 sccb->atype = SCLP_RECONFIG_PCI_ATPYE; 716 sccb->aid = fid; 717 rc = sclp_sync_request(cmd, sccb); 718 if (rc) 719 goto out; 720 switch (sccb->header.response_code) { 721 case 0x0020: 722 case 0x0120: 723 break; 724 default: 725 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n", 726 cmd, sccb->header.response_code); 727 rc = -EIO; 728 break; 729 } 730 out: 731 free_page((unsigned long) sccb); 732 return rc; 733 } 734 735 int sclp_pci_configure(u32 fid) 736 { 737 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid); 738 } 739 EXPORT_SYMBOL(sclp_pci_configure); 740 741 int sclp_pci_deconfigure(u32 fid) 742 { 743 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid); 744 } 745 EXPORT_SYMBOL(sclp_pci_deconfigure); 746 747 /* 748 * Channel path configuration related functions. 749 */ 750 751 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 752 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 753 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 754 755 struct chp_cfg_sccb { 756 struct sccb_header header; 757 u8 ccm; 758 u8 reserved[6]; 759 u8 cssid; 760 } __attribute__((packed)); 761 762 static int do_chp_configure(sclp_cmdw_t cmd) 763 { 764 struct chp_cfg_sccb *sccb; 765 int rc; 766 767 if (!SCLP_HAS_CHP_RECONFIG) 768 return -EOPNOTSUPP; 769 /* Prepare sccb. */ 770 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 771 if (!sccb) 772 return -ENOMEM; 773 sccb->header.length = sizeof(*sccb); 774 rc = sclp_sync_request(cmd, sccb); 775 if (rc) 776 goto out; 777 switch (sccb->header.response_code) { 778 case 0x0020: 779 case 0x0120: 780 case 0x0440: 781 case 0x0450: 782 break; 783 default: 784 pr_warning("configure channel-path failed " 785 "(cmd=0x%08x, response=0x%04x)\n", cmd, 786 sccb->header.response_code); 787 rc = -EIO; 788 break; 789 } 790 out: 791 free_page((unsigned long) sccb); 792 return rc; 793 } 794 795 /** 796 * sclp_chp_configure - perform configure channel-path sclp command 797 * @chpid: channel-path ID 798 * 799 * Perform configure channel-path command sclp command for specified chpid. 800 * Return 0 after command successfully finished, non-zero otherwise. 801 */ 802 int sclp_chp_configure(struct chp_id chpid) 803 { 804 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); 805 } 806 807 /** 808 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command 809 * @chpid: channel-path ID 810 * 811 * Perform deconfigure channel-path command sclp command for specified chpid 812 * and wait for completion. On success return 0. Return non-zero otherwise. 813 */ 814 int sclp_chp_deconfigure(struct chp_id chpid) 815 { 816 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); 817 } 818 819 struct chp_info_sccb { 820 struct sccb_header header; 821 u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; 822 u8 standby[SCLP_CHP_INFO_MASK_SIZE]; 823 u8 configured[SCLP_CHP_INFO_MASK_SIZE]; 824 u8 ccm; 825 u8 reserved[6]; 826 u8 cssid; 827 } __attribute__((packed)); 828 829 /** 830 * sclp_chp_read_info - perform read channel-path information sclp command 831 * @info: resulting channel-path information data 832 * 833 * Perform read channel-path information sclp command and wait for completion. 834 * On success, store channel-path information in @info and return 0. Return 835 * non-zero otherwise. 836 */ 837 int sclp_chp_read_info(struct sclp_chp_info *info) 838 { 839 struct chp_info_sccb *sccb; 840 int rc; 841 842 if (!SCLP_HAS_CHP_INFO) 843 return -EOPNOTSUPP; 844 /* Prepare sccb. */ 845 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 846 if (!sccb) 847 return -ENOMEM; 848 sccb->header.length = sizeof(*sccb); 849 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); 850 if (rc) 851 goto out; 852 if (sccb->header.response_code != 0x0010) { 853 pr_warning("read channel-path info failed " 854 "(response=0x%04x)\n", sccb->header.response_code); 855 rc = -EIO; 856 goto out; 857 } 858 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); 859 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); 860 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); 861 out: 862 free_page((unsigned long) sccb); 863 return rc; 864 } 865