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 static void sclp_sync_callback(struct sclp_req *req, void *data) 32 { 33 struct completion *completion = data; 34 35 complete(completion); 36 } 37 38 int sclp_sync_request(sclp_cmdw_t cmd, void *sccb) 39 { 40 struct completion completion; 41 struct sclp_req *request; 42 int rc; 43 44 request = kzalloc(sizeof(*request), GFP_KERNEL); 45 if (!request) 46 return -ENOMEM; 47 request->command = cmd; 48 request->sccb = sccb; 49 request->status = SCLP_REQ_FILLED; 50 request->callback = sclp_sync_callback; 51 request->callback_data = &completion; 52 init_completion(&completion); 53 54 /* Perform sclp request. */ 55 rc = sclp_add_request(request); 56 if (rc) 57 goto out; 58 wait_for_completion(&completion); 59 60 /* Check response. */ 61 if (request->status != SCLP_REQ_DONE) { 62 pr_warning("sync request failed (cmd=0x%08x, " 63 "status=0x%02x)\n", cmd, request->status); 64 rc = -EIO; 65 } 66 out: 67 kfree(request); 68 return rc; 69 } 70 71 /* 72 * CPU configuration related functions. 73 */ 74 75 #define SCLP_CMDW_READ_CPU_INFO 0x00010001 76 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001 77 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001 78 79 struct read_cpu_info_sccb { 80 struct sccb_header header; 81 u16 nr_configured; 82 u16 offset_configured; 83 u16 nr_standby; 84 u16 offset_standby; 85 u8 reserved[4096 - 16]; 86 } __attribute__((packed, aligned(PAGE_SIZE))); 87 88 static void sclp_fill_cpu_info(struct sclp_cpu_info *info, 89 struct read_cpu_info_sccb *sccb) 90 { 91 char *page = (char *) sccb; 92 93 memset(info, 0, sizeof(*info)); 94 info->configured = sccb->nr_configured; 95 info->standby = sccb->nr_standby; 96 info->combined = sccb->nr_configured + sccb->nr_standby; 97 info->has_cpu_type = sclp_fac84 & 0x1; 98 memcpy(&info->cpu, page + sccb->offset_configured, 99 info->combined * sizeof(struct sclp_cpu_entry)); 100 } 101 102 int sclp_get_cpu_info(struct sclp_cpu_info *info) 103 { 104 int rc; 105 struct read_cpu_info_sccb *sccb; 106 107 if (!SCLP_HAS_CPU_INFO) 108 return -EOPNOTSUPP; 109 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 110 if (!sccb) 111 return -ENOMEM; 112 sccb->header.length = sizeof(*sccb); 113 rc = sclp_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb); 114 if (rc) 115 goto out; 116 if (sccb->header.response_code != 0x0010) { 117 pr_warning("readcpuinfo failed (response=0x%04x)\n", 118 sccb->header.response_code); 119 rc = -EIO; 120 goto out; 121 } 122 sclp_fill_cpu_info(info, sccb); 123 out: 124 free_page((unsigned long) sccb); 125 return rc; 126 } 127 128 struct cpu_configure_sccb { 129 struct sccb_header header; 130 } __attribute__((packed, aligned(8))); 131 132 static int do_cpu_configure(sclp_cmdw_t cmd) 133 { 134 struct cpu_configure_sccb *sccb; 135 int rc; 136 137 if (!SCLP_HAS_CPU_RECONFIG) 138 return -EOPNOTSUPP; 139 /* 140 * This is not going to cross a page boundary since we force 141 * kmalloc to have a minimum alignment of 8 bytes on s390. 142 */ 143 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); 144 if (!sccb) 145 return -ENOMEM; 146 sccb->header.length = sizeof(*sccb); 147 rc = sclp_sync_request(cmd, sccb); 148 if (rc) 149 goto out; 150 switch (sccb->header.response_code) { 151 case 0x0020: 152 case 0x0120: 153 break; 154 default: 155 pr_warning("configure cpu failed (cmd=0x%08x, " 156 "response=0x%04x)\n", cmd, 157 sccb->header.response_code); 158 rc = -EIO; 159 break; 160 } 161 out: 162 kfree(sccb); 163 return rc; 164 } 165 166 int sclp_cpu_configure(u8 cpu) 167 { 168 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8); 169 } 170 171 int sclp_cpu_deconfigure(u8 cpu) 172 { 173 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8); 174 } 175 176 #ifdef CONFIG_MEMORY_HOTPLUG 177 178 static DEFINE_MUTEX(sclp_mem_mutex); 179 static LIST_HEAD(sclp_mem_list); 180 static u8 sclp_max_storage_id; 181 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG]; 182 static int sclp_mem_state_changed; 183 184 struct memory_increment { 185 struct list_head list; 186 u16 rn; 187 int standby; 188 }; 189 190 struct assign_storage_sccb { 191 struct sccb_header header; 192 u16 rn; 193 } __packed; 194 195 int arch_get_memory_phys_device(unsigned long start_pfn) 196 { 197 if (!sclp_rzm) 198 return 0; 199 return PFN_PHYS(start_pfn) >> ilog2(sclp_rzm); 200 } 201 202 static unsigned long long rn2addr(u16 rn) 203 { 204 return (unsigned long long) (rn - 1) * sclp_rzm; 205 } 206 207 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) 208 { 209 struct assign_storage_sccb *sccb; 210 int rc; 211 212 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 213 if (!sccb) 214 return -ENOMEM; 215 sccb->header.length = PAGE_SIZE; 216 sccb->rn = rn; 217 rc = sclp_sync_request(cmd, sccb); 218 if (rc) 219 goto out; 220 switch (sccb->header.response_code) { 221 case 0x0020: 222 case 0x0120: 223 break; 224 default: 225 pr_warning("assign storage failed (cmd=0x%08x, " 226 "response=0x%04x, rn=0x%04x)\n", cmd, 227 sccb->header.response_code, rn); 228 rc = -EIO; 229 break; 230 } 231 out: 232 free_page((unsigned long) sccb); 233 return rc; 234 } 235 236 static int sclp_assign_storage(u16 rn) 237 { 238 unsigned long long start; 239 int rc; 240 241 rc = do_assign_storage(0x000d0001, rn); 242 if (rc) 243 return rc; 244 start = rn2addr(rn); 245 storage_key_init_range(start, start + sclp_rzm); 246 return 0; 247 } 248 249 static int sclp_unassign_storage(u16 rn) 250 { 251 return do_assign_storage(0x000c0001, rn); 252 } 253 254 struct attach_storage_sccb { 255 struct sccb_header header; 256 u16 :16; 257 u16 assigned; 258 u32 :32; 259 u32 entries[0]; 260 } __packed; 261 262 static int sclp_attach_storage(u8 id) 263 { 264 struct attach_storage_sccb *sccb; 265 int rc; 266 int i; 267 268 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 269 if (!sccb) 270 return -ENOMEM; 271 sccb->header.length = PAGE_SIZE; 272 rc = sclp_sync_request(0x00080001 | id << 8, sccb); 273 if (rc) 274 goto out; 275 switch (sccb->header.response_code) { 276 case 0x0020: 277 set_bit(id, sclp_storage_ids); 278 for (i = 0; i < sccb->assigned; i++) { 279 if (sccb->entries[i]) 280 sclp_unassign_storage(sccb->entries[i] >> 16); 281 } 282 break; 283 default: 284 rc = -EIO; 285 break; 286 } 287 out: 288 free_page((unsigned long) sccb); 289 return rc; 290 } 291 292 static int sclp_mem_change_state(unsigned long start, unsigned long size, 293 int online) 294 { 295 struct memory_increment *incr; 296 unsigned long long istart; 297 int rc = 0; 298 299 list_for_each_entry(incr, &sclp_mem_list, list) { 300 istart = rn2addr(incr->rn); 301 if (start + size - 1 < istart) 302 break; 303 if (start > istart + sclp_rzm - 1) 304 continue; 305 if (online) 306 rc |= sclp_assign_storage(incr->rn); 307 else 308 sclp_unassign_storage(incr->rn); 309 } 310 return rc ? -EIO : 0; 311 } 312 313 static int sclp_mem_notifier(struct notifier_block *nb, 314 unsigned long action, void *data) 315 { 316 unsigned long start, size; 317 struct memory_notify *arg; 318 unsigned char id; 319 int rc = 0; 320 321 arg = data; 322 start = arg->start_pfn << PAGE_SHIFT; 323 size = arg->nr_pages << PAGE_SHIFT; 324 mutex_lock(&sclp_mem_mutex); 325 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1) 326 sclp_attach_storage(id); 327 switch (action) { 328 case MEM_ONLINE: 329 case MEM_GOING_OFFLINE: 330 case MEM_CANCEL_OFFLINE: 331 break; 332 case MEM_GOING_ONLINE: 333 rc = sclp_mem_change_state(start, size, 1); 334 break; 335 case MEM_CANCEL_ONLINE: 336 sclp_mem_change_state(start, size, 0); 337 break; 338 case MEM_OFFLINE: 339 sclp_mem_change_state(start, size, 0); 340 break; 341 default: 342 rc = -EINVAL; 343 break; 344 } 345 if (!rc) 346 sclp_mem_state_changed = 1; 347 mutex_unlock(&sclp_mem_mutex); 348 return rc ? NOTIFY_BAD : NOTIFY_OK; 349 } 350 351 static struct notifier_block sclp_mem_nb = { 352 .notifier_call = sclp_mem_notifier, 353 }; 354 355 static void __init add_memory_merged(u16 rn) 356 { 357 static u16 first_rn, num; 358 unsigned long long start, size; 359 360 if (rn && first_rn && (first_rn + num == rn)) { 361 num++; 362 return; 363 } 364 if (!first_rn) 365 goto skip_add; 366 start = rn2addr(first_rn); 367 size = (unsigned long long) num * sclp_rzm; 368 if (start >= VMEM_MAX_PHYS) 369 goto skip_add; 370 if (start + size > VMEM_MAX_PHYS) 371 size = VMEM_MAX_PHYS - start; 372 if (memory_end_set && (start >= memory_end)) 373 goto skip_add; 374 if (memory_end_set && (start + size > memory_end)) 375 size = memory_end - start; 376 add_memory(0, start, size); 377 skip_add: 378 first_rn = rn; 379 num = 1; 380 } 381 382 static void __init sclp_add_standby_memory(void) 383 { 384 struct memory_increment *incr; 385 386 list_for_each_entry(incr, &sclp_mem_list, list) 387 if (incr->standby) 388 add_memory_merged(incr->rn); 389 add_memory_merged(0); 390 } 391 392 static void __init insert_increment(u16 rn, int standby, int assigned) 393 { 394 struct memory_increment *incr, *new_incr; 395 struct list_head *prev; 396 u16 last_rn; 397 398 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); 399 if (!new_incr) 400 return; 401 new_incr->rn = rn; 402 new_incr->standby = standby; 403 last_rn = 0; 404 prev = &sclp_mem_list; 405 list_for_each_entry(incr, &sclp_mem_list, list) { 406 if (assigned && incr->rn > rn) 407 break; 408 if (!assigned && incr->rn - last_rn > 1) 409 break; 410 last_rn = incr->rn; 411 prev = &incr->list; 412 } 413 if (!assigned) 414 new_incr->rn = last_rn + 1; 415 if (new_incr->rn > sclp_rnmax) { 416 kfree(new_incr); 417 return; 418 } 419 list_add(&new_incr->list, prev); 420 } 421 422 static int sclp_mem_freeze(struct device *dev) 423 { 424 if (!sclp_mem_state_changed) 425 return 0; 426 pr_err("Memory hotplug state changed, suspend refused.\n"); 427 return -EPERM; 428 } 429 430 struct read_storage_sccb { 431 struct sccb_header header; 432 u16 max_id; 433 u16 assigned; 434 u16 standby; 435 u16 :16; 436 u32 entries[0]; 437 } __packed; 438 439 static const struct dev_pm_ops sclp_mem_pm_ops = { 440 .freeze = sclp_mem_freeze, 441 }; 442 443 static struct platform_driver sclp_mem_pdrv = { 444 .driver = { 445 .name = "sclp_mem", 446 .pm = &sclp_mem_pm_ops, 447 }, 448 }; 449 450 static int __init sclp_detect_standby_memory(void) 451 { 452 struct platform_device *sclp_pdev; 453 struct read_storage_sccb *sccb; 454 int i, id, assigned, rc; 455 456 if (OLDMEM_BASE) /* No standby memory in kdump mode */ 457 return 0; 458 if (!sclp_early_read_info_sccb_valid) 459 return 0; 460 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL) 461 return 0; 462 rc = -ENOMEM; 463 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA); 464 if (!sccb) 465 goto out; 466 assigned = 0; 467 for (id = 0; id <= sclp_max_storage_id; id++) { 468 memset(sccb, 0, PAGE_SIZE); 469 sccb->header.length = PAGE_SIZE; 470 rc = sclp_sync_request(0x00040001 | id << 8, sccb); 471 if (rc) 472 goto out; 473 switch (sccb->header.response_code) { 474 case 0x0010: 475 set_bit(id, sclp_storage_ids); 476 for (i = 0; i < sccb->assigned; i++) { 477 if (!sccb->entries[i]) 478 continue; 479 assigned++; 480 insert_increment(sccb->entries[i] >> 16, 0, 1); 481 } 482 break; 483 case 0x0310: 484 break; 485 case 0x0410: 486 for (i = 0; i < sccb->assigned; i++) { 487 if (!sccb->entries[i]) 488 continue; 489 assigned++; 490 insert_increment(sccb->entries[i] >> 16, 1, 1); 491 } 492 break; 493 default: 494 rc = -EIO; 495 break; 496 } 497 if (!rc) 498 sclp_max_storage_id = sccb->max_id; 499 } 500 if (rc || list_empty(&sclp_mem_list)) 501 goto out; 502 for (i = 1; i <= sclp_rnmax - assigned; i++) 503 insert_increment(0, 1, 0); 504 rc = register_memory_notifier(&sclp_mem_nb); 505 if (rc) 506 goto out; 507 rc = platform_driver_register(&sclp_mem_pdrv); 508 if (rc) 509 goto out; 510 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0); 511 rc = PTR_RET(sclp_pdev); 512 if (rc) 513 goto out_driver; 514 sclp_add_standby_memory(); 515 goto out; 516 out_driver: 517 platform_driver_unregister(&sclp_mem_pdrv); 518 out: 519 free_page((unsigned long) sccb); 520 return rc; 521 } 522 __initcall(sclp_detect_standby_memory); 523 524 #endif /* CONFIG_MEMORY_HOTPLUG */ 525 526 /* 527 * PCI I/O adapter configuration related functions. 528 */ 529 #define SCLP_CMDW_CONFIGURE_PCI 0x001a0001 530 #define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001 531 532 #define SCLP_RECONFIG_PCI_ATPYE 2 533 534 struct pci_cfg_sccb { 535 struct sccb_header header; 536 u8 atype; /* adapter type */ 537 u8 reserved1; 538 u16 reserved2; 539 u32 aid; /* adapter identifier */ 540 } __packed; 541 542 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid) 543 { 544 struct pci_cfg_sccb *sccb; 545 int rc; 546 547 if (!SCLP_HAS_PCI_RECONFIG) 548 return -EOPNOTSUPP; 549 550 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 551 if (!sccb) 552 return -ENOMEM; 553 554 sccb->header.length = PAGE_SIZE; 555 sccb->atype = SCLP_RECONFIG_PCI_ATPYE; 556 sccb->aid = fid; 557 rc = sclp_sync_request(cmd, sccb); 558 if (rc) 559 goto out; 560 switch (sccb->header.response_code) { 561 case 0x0020: 562 case 0x0120: 563 break; 564 default: 565 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n", 566 cmd, sccb->header.response_code); 567 rc = -EIO; 568 break; 569 } 570 out: 571 free_page((unsigned long) sccb); 572 return rc; 573 } 574 575 int sclp_pci_configure(u32 fid) 576 { 577 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid); 578 } 579 EXPORT_SYMBOL(sclp_pci_configure); 580 581 int sclp_pci_deconfigure(u32 fid) 582 { 583 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid); 584 } 585 EXPORT_SYMBOL(sclp_pci_deconfigure); 586 587 /* 588 * Channel path configuration related functions. 589 */ 590 591 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 592 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 593 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 594 595 struct chp_cfg_sccb { 596 struct sccb_header header; 597 u8 ccm; 598 u8 reserved[6]; 599 u8 cssid; 600 } __attribute__((packed)); 601 602 static int do_chp_configure(sclp_cmdw_t cmd) 603 { 604 struct chp_cfg_sccb *sccb; 605 int rc; 606 607 if (!SCLP_HAS_CHP_RECONFIG) 608 return -EOPNOTSUPP; 609 /* Prepare sccb. */ 610 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 611 if (!sccb) 612 return -ENOMEM; 613 sccb->header.length = sizeof(*sccb); 614 rc = sclp_sync_request(cmd, sccb); 615 if (rc) 616 goto out; 617 switch (sccb->header.response_code) { 618 case 0x0020: 619 case 0x0120: 620 case 0x0440: 621 case 0x0450: 622 break; 623 default: 624 pr_warning("configure channel-path failed " 625 "(cmd=0x%08x, response=0x%04x)\n", cmd, 626 sccb->header.response_code); 627 rc = -EIO; 628 break; 629 } 630 out: 631 free_page((unsigned long) sccb); 632 return rc; 633 } 634 635 /** 636 * sclp_chp_configure - perform configure channel-path sclp command 637 * @chpid: channel-path ID 638 * 639 * Perform configure channel-path command sclp command for specified chpid. 640 * Return 0 after command successfully finished, non-zero otherwise. 641 */ 642 int sclp_chp_configure(struct chp_id chpid) 643 { 644 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); 645 } 646 647 /** 648 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command 649 * @chpid: channel-path ID 650 * 651 * Perform deconfigure channel-path command sclp command for specified chpid 652 * and wait for completion. On success return 0. Return non-zero otherwise. 653 */ 654 int sclp_chp_deconfigure(struct chp_id chpid) 655 { 656 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); 657 } 658 659 struct chp_info_sccb { 660 struct sccb_header header; 661 u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; 662 u8 standby[SCLP_CHP_INFO_MASK_SIZE]; 663 u8 configured[SCLP_CHP_INFO_MASK_SIZE]; 664 u8 ccm; 665 u8 reserved[6]; 666 u8 cssid; 667 } __attribute__((packed)); 668 669 /** 670 * sclp_chp_read_info - perform read channel-path information sclp command 671 * @info: resulting channel-path information data 672 * 673 * Perform read channel-path information sclp command and wait for completion. 674 * On success, store channel-path information in @info and return 0. Return 675 * non-zero otherwise. 676 */ 677 int sclp_chp_read_info(struct sclp_chp_info *info) 678 { 679 struct chp_info_sccb *sccb; 680 int rc; 681 682 if (!SCLP_HAS_CHP_INFO) 683 return -EOPNOTSUPP; 684 /* Prepare sccb. */ 685 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 686 if (!sccb) 687 return -ENOMEM; 688 sccb->header.length = sizeof(*sccb); 689 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); 690 if (rc) 691 goto out; 692 if (sccb->header.response_code != 0x0010) { 693 pr_warning("read channel-path info failed " 694 "(response=0x%04x)\n", sccb->header.response_code); 695 rc = -EIO; 696 goto out; 697 } 698 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); 699 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); 700 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); 701 out: 702 free_page((unsigned long) sccb); 703 return rc; 704 } 705