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_OPCMD_MASK | EVTYP_PMSGCMD_MASK))) 149 return 0; 150 if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))) 151 return 0; 152 return 1; 153 } 154 155 bool __init sclp_has_vt220(void) 156 { 157 struct init_sccb *sccb = &early_event_mask_sccb; 158 159 if (sccb->header.response_code != 0x20) 160 return 0; 161 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) 162 return 1; 163 return 0; 164 } 165 166 unsigned long long sclp_get_rnmax(void) 167 { 168 return rnmax; 169 } 170 171 unsigned long long sclp_get_rzm(void) 172 { 173 return rzm; 174 } 175 176 /* 177 * This function will be called after sclp_facilities_detect(), which gets 178 * called from early.c code. Therefore the sccb should have valid contents. 179 */ 180 void __init sclp_get_ipl_info(struct sclp_ipl_info *info) 181 { 182 struct read_info_sccb *sccb; 183 184 if (!early_read_info_sccb_valid) 185 return; 186 sccb = &early_read_info_sccb; 187 info->is_valid = 1; 188 if (sccb->flags & 0x2) 189 info->has_dump = 1; 190 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN); 191 } 192 193 static void sclp_sync_callback(struct sclp_req *req, void *data) 194 { 195 struct completion *completion = data; 196 197 complete(completion); 198 } 199 200 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb) 201 { 202 struct completion completion; 203 struct sclp_req *request; 204 int rc; 205 206 request = kzalloc(sizeof(*request), GFP_KERNEL); 207 if (!request) 208 return -ENOMEM; 209 request->command = cmd; 210 request->sccb = sccb; 211 request->status = SCLP_REQ_FILLED; 212 request->callback = sclp_sync_callback; 213 request->callback_data = &completion; 214 init_completion(&completion); 215 216 /* Perform sclp request. */ 217 rc = sclp_add_request(request); 218 if (rc) 219 goto out; 220 wait_for_completion(&completion); 221 222 /* Check response. */ 223 if (request->status != SCLP_REQ_DONE) { 224 pr_warning("sync request failed (cmd=0x%08x, " 225 "status=0x%02x)\n", cmd, request->status); 226 rc = -EIO; 227 } 228 out: 229 kfree(request); 230 return rc; 231 } 232 233 /* 234 * CPU configuration related functions. 235 */ 236 237 #define SCLP_CMDW_READ_CPU_INFO 0x00010001 238 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001 239 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001 240 241 struct read_cpu_info_sccb { 242 struct sccb_header header; 243 u16 nr_configured; 244 u16 offset_configured; 245 u16 nr_standby; 246 u16 offset_standby; 247 u8 reserved[4096 - 16]; 248 } __attribute__((packed, aligned(PAGE_SIZE))); 249 250 static void sclp_fill_cpu_info(struct sclp_cpu_info *info, 251 struct read_cpu_info_sccb *sccb) 252 { 253 char *page = (char *) sccb; 254 255 memset(info, 0, sizeof(*info)); 256 info->configured = sccb->nr_configured; 257 info->standby = sccb->nr_standby; 258 info->combined = sccb->nr_configured + sccb->nr_standby; 259 info->has_cpu_type = sclp_fac84 & 0x1; 260 memcpy(&info->cpu, page + sccb->offset_configured, 261 info->combined * sizeof(struct sclp_cpu_entry)); 262 } 263 264 int sclp_get_cpu_info(struct sclp_cpu_info *info) 265 { 266 int rc; 267 struct read_cpu_info_sccb *sccb; 268 269 if (!SCLP_HAS_CPU_INFO) 270 return -EOPNOTSUPP; 271 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 272 if (!sccb) 273 return -ENOMEM; 274 sccb->header.length = sizeof(*sccb); 275 rc = sclp_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb); 276 if (rc) 277 goto out; 278 if (sccb->header.response_code != 0x0010) { 279 pr_warning("readcpuinfo failed (response=0x%04x)\n", 280 sccb->header.response_code); 281 rc = -EIO; 282 goto out; 283 } 284 sclp_fill_cpu_info(info, sccb); 285 out: 286 free_page((unsigned long) sccb); 287 return rc; 288 } 289 290 struct cpu_configure_sccb { 291 struct sccb_header header; 292 } __attribute__((packed, aligned(8))); 293 294 static int do_cpu_configure(sclp_cmdw_t cmd) 295 { 296 struct cpu_configure_sccb *sccb; 297 int rc; 298 299 if (!SCLP_HAS_CPU_RECONFIG) 300 return -EOPNOTSUPP; 301 /* 302 * This is not going to cross a page boundary since we force 303 * kmalloc to have a minimum alignment of 8 bytes on s390. 304 */ 305 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); 306 if (!sccb) 307 return -ENOMEM; 308 sccb->header.length = sizeof(*sccb); 309 rc = sclp_sync_request(cmd, sccb); 310 if (rc) 311 goto out; 312 switch (sccb->header.response_code) { 313 case 0x0020: 314 case 0x0120: 315 break; 316 default: 317 pr_warning("configure cpu failed (cmd=0x%08x, " 318 "response=0x%04x)\n", cmd, 319 sccb->header.response_code); 320 rc = -EIO; 321 break; 322 } 323 out: 324 kfree(sccb); 325 return rc; 326 } 327 328 int sclp_cpu_configure(u8 cpu) 329 { 330 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8); 331 } 332 333 int sclp_cpu_deconfigure(u8 cpu) 334 { 335 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8); 336 } 337 338 #ifdef CONFIG_MEMORY_HOTPLUG 339 340 static DEFINE_MUTEX(sclp_mem_mutex); 341 static LIST_HEAD(sclp_mem_list); 342 static u8 sclp_max_storage_id; 343 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG]; 344 static int sclp_mem_state_changed; 345 346 struct memory_increment { 347 struct list_head list; 348 u16 rn; 349 int standby; 350 }; 351 352 struct assign_storage_sccb { 353 struct sccb_header header; 354 u16 rn; 355 } __packed; 356 357 int arch_get_memory_phys_device(unsigned long start_pfn) 358 { 359 if (!rzm) 360 return 0; 361 return PFN_PHYS(start_pfn) >> ilog2(rzm); 362 } 363 364 static unsigned long long rn2addr(u16 rn) 365 { 366 return (unsigned long long) (rn - 1) * rzm; 367 } 368 369 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) 370 { 371 struct assign_storage_sccb *sccb; 372 int rc; 373 374 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 375 if (!sccb) 376 return -ENOMEM; 377 sccb->header.length = PAGE_SIZE; 378 sccb->rn = rn; 379 rc = sclp_sync_request(cmd, sccb); 380 if (rc) 381 goto out; 382 switch (sccb->header.response_code) { 383 case 0x0020: 384 case 0x0120: 385 break; 386 default: 387 pr_warning("assign storage failed (cmd=0x%08x, " 388 "response=0x%04x, rn=0x%04x)\n", cmd, 389 sccb->header.response_code, rn); 390 rc = -EIO; 391 break; 392 } 393 out: 394 free_page((unsigned long) sccb); 395 return rc; 396 } 397 398 static int sclp_assign_storage(u16 rn) 399 { 400 unsigned long long start; 401 int rc; 402 403 rc = do_assign_storage(0x000d0001, rn); 404 if (rc) 405 return rc; 406 start = rn2addr(rn); 407 storage_key_init_range(start, start + rzm); 408 return 0; 409 } 410 411 static int sclp_unassign_storage(u16 rn) 412 { 413 return do_assign_storage(0x000c0001, rn); 414 } 415 416 struct attach_storage_sccb { 417 struct sccb_header header; 418 u16 :16; 419 u16 assigned; 420 u32 :32; 421 u32 entries[0]; 422 } __packed; 423 424 static int sclp_attach_storage(u8 id) 425 { 426 struct attach_storage_sccb *sccb; 427 int rc; 428 int i; 429 430 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 431 if (!sccb) 432 return -ENOMEM; 433 sccb->header.length = PAGE_SIZE; 434 rc = sclp_sync_request(0x00080001 | id << 8, sccb); 435 if (rc) 436 goto out; 437 switch (sccb->header.response_code) { 438 case 0x0020: 439 set_bit(id, sclp_storage_ids); 440 for (i = 0; i < sccb->assigned; i++) { 441 if (sccb->entries[i]) 442 sclp_unassign_storage(sccb->entries[i] >> 16); 443 } 444 break; 445 default: 446 rc = -EIO; 447 break; 448 } 449 out: 450 free_page((unsigned long) sccb); 451 return rc; 452 } 453 454 static int sclp_mem_change_state(unsigned long start, unsigned long size, 455 int online) 456 { 457 struct memory_increment *incr; 458 unsigned long long istart; 459 int rc = 0; 460 461 list_for_each_entry(incr, &sclp_mem_list, list) { 462 istart = rn2addr(incr->rn); 463 if (start + size - 1 < istart) 464 break; 465 if (start > istart + rzm - 1) 466 continue; 467 if (online) 468 rc |= sclp_assign_storage(incr->rn); 469 else 470 sclp_unassign_storage(incr->rn); 471 } 472 return rc ? -EIO : 0; 473 } 474 475 static int sclp_mem_notifier(struct notifier_block *nb, 476 unsigned long action, void *data) 477 { 478 unsigned long start, size; 479 struct memory_notify *arg; 480 unsigned char id; 481 int rc = 0; 482 483 arg = data; 484 start = arg->start_pfn << PAGE_SHIFT; 485 size = arg->nr_pages << PAGE_SHIFT; 486 mutex_lock(&sclp_mem_mutex); 487 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1) 488 sclp_attach_storage(id); 489 switch (action) { 490 case MEM_ONLINE: 491 case MEM_GOING_OFFLINE: 492 case MEM_CANCEL_OFFLINE: 493 break; 494 case MEM_GOING_ONLINE: 495 rc = sclp_mem_change_state(start, size, 1); 496 break; 497 case MEM_CANCEL_ONLINE: 498 sclp_mem_change_state(start, size, 0); 499 break; 500 case MEM_OFFLINE: 501 sclp_mem_change_state(start, size, 0); 502 break; 503 default: 504 rc = -EINVAL; 505 break; 506 } 507 if (!rc) 508 sclp_mem_state_changed = 1; 509 mutex_unlock(&sclp_mem_mutex); 510 return rc ? NOTIFY_BAD : NOTIFY_OK; 511 } 512 513 static struct notifier_block sclp_mem_nb = { 514 .notifier_call = sclp_mem_notifier, 515 }; 516 517 static void __init add_memory_merged(u16 rn) 518 { 519 static u16 first_rn, num; 520 unsigned long long start, size; 521 522 if (rn && first_rn && (first_rn + num == rn)) { 523 num++; 524 return; 525 } 526 if (!first_rn) 527 goto skip_add; 528 start = rn2addr(first_rn); 529 size = (unsigned long long ) num * rzm; 530 if (start >= VMEM_MAX_PHYS) 531 goto skip_add; 532 if (start + size > VMEM_MAX_PHYS) 533 size = VMEM_MAX_PHYS - start; 534 if (memory_end_set && (start >= memory_end)) 535 goto skip_add; 536 if (memory_end_set && (start + size > memory_end)) 537 size = memory_end - start; 538 add_memory(0, start, size); 539 skip_add: 540 first_rn = rn; 541 num = 1; 542 } 543 544 static void __init sclp_add_standby_memory(void) 545 { 546 struct memory_increment *incr; 547 548 list_for_each_entry(incr, &sclp_mem_list, list) 549 if (incr->standby) 550 add_memory_merged(incr->rn); 551 add_memory_merged(0); 552 } 553 554 static void __init insert_increment(u16 rn, int standby, int assigned) 555 { 556 struct memory_increment *incr, *new_incr; 557 struct list_head *prev; 558 u16 last_rn; 559 560 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); 561 if (!new_incr) 562 return; 563 new_incr->rn = rn; 564 new_incr->standby = standby; 565 last_rn = 0; 566 prev = &sclp_mem_list; 567 list_for_each_entry(incr, &sclp_mem_list, list) { 568 if (assigned && incr->rn > rn) 569 break; 570 if (!assigned && incr->rn - last_rn > 1) 571 break; 572 last_rn = incr->rn; 573 prev = &incr->list; 574 } 575 if (!assigned) 576 new_incr->rn = last_rn + 1; 577 if (new_incr->rn > rnmax) { 578 kfree(new_incr); 579 return; 580 } 581 list_add(&new_incr->list, prev); 582 } 583 584 static int sclp_mem_freeze(struct device *dev) 585 { 586 if (!sclp_mem_state_changed) 587 return 0; 588 pr_err("Memory hotplug state changed, suspend refused.\n"); 589 return -EPERM; 590 } 591 592 struct read_storage_sccb { 593 struct sccb_header header; 594 u16 max_id; 595 u16 assigned; 596 u16 standby; 597 u16 :16; 598 u32 entries[0]; 599 } __packed; 600 601 static const struct dev_pm_ops sclp_mem_pm_ops = { 602 .freeze = sclp_mem_freeze, 603 }; 604 605 static struct platform_driver sclp_mem_pdrv = { 606 .driver = { 607 .name = "sclp_mem", 608 .pm = &sclp_mem_pm_ops, 609 }, 610 }; 611 612 static int __init sclp_detect_standby_memory(void) 613 { 614 struct platform_device *sclp_pdev; 615 struct read_storage_sccb *sccb; 616 int i, id, assigned, rc; 617 618 if (OLDMEM_BASE) /* No standby memory in kdump mode */ 619 return 0; 620 if (!early_read_info_sccb_valid) 621 return 0; 622 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL) 623 return 0; 624 rc = -ENOMEM; 625 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA); 626 if (!sccb) 627 goto out; 628 assigned = 0; 629 for (id = 0; id <= sclp_max_storage_id; id++) { 630 memset(sccb, 0, PAGE_SIZE); 631 sccb->header.length = PAGE_SIZE; 632 rc = sclp_sync_request(0x00040001 | id << 8, sccb); 633 if (rc) 634 goto out; 635 switch (sccb->header.response_code) { 636 case 0x0010: 637 set_bit(id, sclp_storage_ids); 638 for (i = 0; i < sccb->assigned; i++) { 639 if (!sccb->entries[i]) 640 continue; 641 assigned++; 642 insert_increment(sccb->entries[i] >> 16, 0, 1); 643 } 644 break; 645 case 0x0310: 646 break; 647 case 0x0410: 648 for (i = 0; i < sccb->assigned; i++) { 649 if (!sccb->entries[i]) 650 continue; 651 assigned++; 652 insert_increment(sccb->entries[i] >> 16, 1, 1); 653 } 654 break; 655 default: 656 rc = -EIO; 657 break; 658 } 659 if (!rc) 660 sclp_max_storage_id = sccb->max_id; 661 } 662 if (rc || list_empty(&sclp_mem_list)) 663 goto out; 664 for (i = 1; i <= rnmax - assigned; i++) 665 insert_increment(0, 1, 0); 666 rc = register_memory_notifier(&sclp_mem_nb); 667 if (rc) 668 goto out; 669 rc = platform_driver_register(&sclp_mem_pdrv); 670 if (rc) 671 goto out; 672 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0); 673 rc = PTR_RET(sclp_pdev); 674 if (rc) 675 goto out_driver; 676 sclp_add_standby_memory(); 677 goto out; 678 out_driver: 679 platform_driver_unregister(&sclp_mem_pdrv); 680 out: 681 free_page((unsigned long) sccb); 682 return rc; 683 } 684 __initcall(sclp_detect_standby_memory); 685 686 #endif /* CONFIG_MEMORY_HOTPLUG */ 687 688 /* 689 * PCI I/O adapter configuration related functions. 690 */ 691 #define SCLP_CMDW_CONFIGURE_PCI 0x001a0001 692 #define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001 693 694 #define SCLP_RECONFIG_PCI_ATPYE 2 695 696 struct pci_cfg_sccb { 697 struct sccb_header header; 698 u8 atype; /* adapter type */ 699 u8 reserved1; 700 u16 reserved2; 701 u32 aid; /* adapter identifier */ 702 } __packed; 703 704 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid) 705 { 706 struct pci_cfg_sccb *sccb; 707 int rc; 708 709 if (!SCLP_HAS_PCI_RECONFIG) 710 return -EOPNOTSUPP; 711 712 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 713 if (!sccb) 714 return -ENOMEM; 715 716 sccb->header.length = PAGE_SIZE; 717 sccb->atype = SCLP_RECONFIG_PCI_ATPYE; 718 sccb->aid = fid; 719 rc = sclp_sync_request(cmd, sccb); 720 if (rc) 721 goto out; 722 switch (sccb->header.response_code) { 723 case 0x0020: 724 case 0x0120: 725 break; 726 default: 727 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n", 728 cmd, sccb->header.response_code); 729 rc = -EIO; 730 break; 731 } 732 out: 733 free_page((unsigned long) sccb); 734 return rc; 735 } 736 737 int sclp_pci_configure(u32 fid) 738 { 739 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid); 740 } 741 EXPORT_SYMBOL(sclp_pci_configure); 742 743 int sclp_pci_deconfigure(u32 fid) 744 { 745 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid); 746 } 747 EXPORT_SYMBOL(sclp_pci_deconfigure); 748 749 /* 750 * Channel path configuration related functions. 751 */ 752 753 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 754 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 755 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 756 757 struct chp_cfg_sccb { 758 struct sccb_header header; 759 u8 ccm; 760 u8 reserved[6]; 761 u8 cssid; 762 } __attribute__((packed)); 763 764 static int do_chp_configure(sclp_cmdw_t cmd) 765 { 766 struct chp_cfg_sccb *sccb; 767 int rc; 768 769 if (!SCLP_HAS_CHP_RECONFIG) 770 return -EOPNOTSUPP; 771 /* Prepare sccb. */ 772 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 773 if (!sccb) 774 return -ENOMEM; 775 sccb->header.length = sizeof(*sccb); 776 rc = sclp_sync_request(cmd, sccb); 777 if (rc) 778 goto out; 779 switch (sccb->header.response_code) { 780 case 0x0020: 781 case 0x0120: 782 case 0x0440: 783 case 0x0450: 784 break; 785 default: 786 pr_warning("configure channel-path failed " 787 "(cmd=0x%08x, response=0x%04x)\n", cmd, 788 sccb->header.response_code); 789 rc = -EIO; 790 break; 791 } 792 out: 793 free_page((unsigned long) sccb); 794 return rc; 795 } 796 797 /** 798 * sclp_chp_configure - perform configure channel-path sclp command 799 * @chpid: channel-path ID 800 * 801 * Perform configure channel-path command sclp command for specified chpid. 802 * Return 0 after command successfully finished, non-zero otherwise. 803 */ 804 int sclp_chp_configure(struct chp_id chpid) 805 { 806 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); 807 } 808 809 /** 810 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command 811 * @chpid: channel-path ID 812 * 813 * Perform deconfigure channel-path command sclp command for specified chpid 814 * and wait for completion. On success return 0. Return non-zero otherwise. 815 */ 816 int sclp_chp_deconfigure(struct chp_id chpid) 817 { 818 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); 819 } 820 821 struct chp_info_sccb { 822 struct sccb_header header; 823 u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; 824 u8 standby[SCLP_CHP_INFO_MASK_SIZE]; 825 u8 configured[SCLP_CHP_INFO_MASK_SIZE]; 826 u8 ccm; 827 u8 reserved[6]; 828 u8 cssid; 829 } __attribute__((packed)); 830 831 /** 832 * sclp_chp_read_info - perform read channel-path information sclp command 833 * @info: resulting channel-path information data 834 * 835 * Perform read channel-path information sclp command and wait for completion. 836 * On success, store channel-path information in @info and return 0. Return 837 * non-zero otherwise. 838 */ 839 int sclp_chp_read_info(struct sclp_chp_info *info) 840 { 841 struct chp_info_sccb *sccb; 842 int rc; 843 844 if (!SCLP_HAS_CHP_INFO) 845 return -EOPNOTSUPP; 846 /* Prepare sccb. */ 847 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 848 if (!sccb) 849 return -ENOMEM; 850 sccb->header.length = sizeof(*sccb); 851 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); 852 if (rc) 853 goto out; 854 if (sccb->header.response_code != 0x0010) { 855 pr_warning("read channel-path info failed " 856 "(response=0x%04x)\n", sccb->header.response_code); 857 rc = -EIO; 858 goto out; 859 } 860 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); 861 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); 862 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); 863 out: 864 free_page((unsigned long) sccb); 865 return rc; 866 } 867