1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * APEI Error INJection support 4 * 5 * EINJ provides a hardware error injection mechanism, this is useful 6 * for debugging and testing of other APEI and RAS features. 7 * 8 * For more information about EINJ, please refer to ACPI Specification 9 * version 4.0, section 17.5. 10 * 11 * Copyright 2009-2010 Intel Corp. 12 * Author: Huang Ying <ying.huang@intel.com> 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/io.h> 19 #include <linux/debugfs.h> 20 #include <linux/seq_file.h> 21 #include <linux/nmi.h> 22 #include <linux/delay.h> 23 #include <linux/mm.h> 24 #include <asm/unaligned.h> 25 26 #include "apei-internal.h" 27 28 #undef pr_fmt 29 #define pr_fmt(fmt) "EINJ: " fmt 30 31 #define SPIN_UNIT 100 /* 100ns */ 32 /* Firmware should respond within 1 milliseconds */ 33 #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC) 34 #define ACPI5_VENDOR_BIT BIT(31) 35 #define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \ 36 ACPI_EINJ_MEMORY_UNCORRECTABLE | \ 37 ACPI_EINJ_MEMORY_FATAL) 38 39 /* 40 * ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action. 41 */ 42 static int acpi5; 43 44 struct set_error_type_with_address { 45 u32 type; 46 u32 vendor_extension; 47 u32 flags; 48 u32 apicid; 49 u64 memory_address; 50 u64 memory_address_range; 51 u32 pcie_sbdf; 52 }; 53 enum { 54 SETWA_FLAGS_APICID = 1, 55 SETWA_FLAGS_MEM = 2, 56 SETWA_FLAGS_PCIE_SBDF = 4, 57 }; 58 59 /* 60 * Vendor extensions for platform specific operations 61 */ 62 struct vendor_error_type_extension { 63 u32 length; 64 u32 pcie_sbdf; 65 u16 vendor_id; 66 u16 device_id; 67 u8 rev_id; 68 u8 reserved[3]; 69 }; 70 71 static u32 notrigger; 72 73 static u32 vendor_flags; 74 static struct debugfs_blob_wrapper vendor_blob; 75 static char vendor_dev[64]; 76 77 /* 78 * Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the 79 * EINJ table through an unpublished extension. Use with caution as 80 * most will ignore the parameter and make their own choice of address 81 * for error injection. This extension is used only if 82 * param_extension module parameter is specified. 83 */ 84 struct einj_parameter { 85 u64 type; 86 u64 reserved1; 87 u64 reserved2; 88 u64 param1; 89 u64 param2; 90 }; 91 92 #define EINJ_OP_BUSY 0x1 93 #define EINJ_STATUS_SUCCESS 0x0 94 #define EINJ_STATUS_FAIL 0x1 95 #define EINJ_STATUS_INVAL 0x2 96 97 #define EINJ_TAB_ENTRY(tab) \ 98 ((struct acpi_whea_header *)((char *)(tab) + \ 99 sizeof(struct acpi_table_einj))) 100 101 static bool param_extension; 102 module_param(param_extension, bool, 0); 103 104 static struct acpi_table_einj *einj_tab; 105 106 static struct apei_resources einj_resources; 107 108 static struct apei_exec_ins_type einj_ins_type[] = { 109 [ACPI_EINJ_READ_REGISTER] = { 110 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 111 .run = apei_exec_read_register, 112 }, 113 [ACPI_EINJ_READ_REGISTER_VALUE] = { 114 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 115 .run = apei_exec_read_register_value, 116 }, 117 [ACPI_EINJ_WRITE_REGISTER] = { 118 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 119 .run = apei_exec_write_register, 120 }, 121 [ACPI_EINJ_WRITE_REGISTER_VALUE] = { 122 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 123 .run = apei_exec_write_register_value, 124 }, 125 [ACPI_EINJ_NOOP] = { 126 .flags = 0, 127 .run = apei_exec_noop, 128 }, 129 }; 130 131 /* 132 * Prevent EINJ interpreter to run simultaneously, because the 133 * corresponding firmware implementation may not work properly when 134 * invoked simultaneously. 135 */ 136 static DEFINE_MUTEX(einj_mutex); 137 138 static void *einj_param; 139 140 static void einj_exec_ctx_init(struct apei_exec_context *ctx) 141 { 142 apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type), 143 EINJ_TAB_ENTRY(einj_tab), einj_tab->entries); 144 } 145 146 static int __einj_get_available_error_type(u32 *type) 147 { 148 struct apei_exec_context ctx; 149 int rc; 150 151 einj_exec_ctx_init(&ctx); 152 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE); 153 if (rc) 154 return rc; 155 *type = apei_exec_ctx_get_output(&ctx); 156 157 return 0; 158 } 159 160 /* Get error injection capabilities of the platform */ 161 static int einj_get_available_error_type(u32 *type) 162 { 163 int rc; 164 165 mutex_lock(&einj_mutex); 166 rc = __einj_get_available_error_type(type); 167 mutex_unlock(&einj_mutex); 168 169 return rc; 170 } 171 172 static int einj_timedout(u64 *t) 173 { 174 if ((s64)*t < SPIN_UNIT) { 175 pr_warn(FW_WARN "Firmware does not respond in time\n"); 176 return 1; 177 } 178 *t -= SPIN_UNIT; 179 ndelay(SPIN_UNIT); 180 touch_nmi_watchdog(); 181 return 0; 182 } 183 184 static void check_vendor_extension(u64 paddr, 185 struct set_error_type_with_address *v5param) 186 { 187 int offset = v5param->vendor_extension; 188 struct vendor_error_type_extension *v; 189 u32 sbdf; 190 191 if (!offset) 192 return; 193 v = acpi_os_map_iomem(paddr + offset, sizeof(*v)); 194 if (!v) 195 return; 196 sbdf = v->pcie_sbdf; 197 sprintf(vendor_dev, "%x:%x:%x.%x vendor_id=%x device_id=%x rev_id=%x\n", 198 sbdf >> 24, (sbdf >> 16) & 0xff, 199 (sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7, 200 v->vendor_id, v->device_id, v->rev_id); 201 acpi_os_unmap_iomem(v, sizeof(*v)); 202 } 203 204 static void *einj_get_parameter_address(void) 205 { 206 int i; 207 u64 pa_v4 = 0, pa_v5 = 0; 208 struct acpi_whea_header *entry; 209 210 entry = EINJ_TAB_ENTRY(einj_tab); 211 for (i = 0; i < einj_tab->entries; i++) { 212 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE && 213 entry->instruction == ACPI_EINJ_WRITE_REGISTER && 214 entry->register_region.space_id == 215 ACPI_ADR_SPACE_SYSTEM_MEMORY) 216 pa_v4 = get_unaligned(&entry->register_region.address); 217 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS && 218 entry->instruction == ACPI_EINJ_WRITE_REGISTER && 219 entry->register_region.space_id == 220 ACPI_ADR_SPACE_SYSTEM_MEMORY) 221 pa_v5 = get_unaligned(&entry->register_region.address); 222 entry++; 223 } 224 if (pa_v5) { 225 struct set_error_type_with_address *v5param; 226 227 v5param = acpi_os_map_iomem(pa_v5, sizeof(*v5param)); 228 if (v5param) { 229 acpi5 = 1; 230 check_vendor_extension(pa_v5, v5param); 231 return v5param; 232 } 233 } 234 if (param_extension && pa_v4) { 235 struct einj_parameter *v4param; 236 237 v4param = acpi_os_map_iomem(pa_v4, sizeof(*v4param)); 238 if (!v4param) 239 return NULL; 240 if (v4param->reserved1 || v4param->reserved2) { 241 acpi_os_unmap_iomem(v4param, sizeof(*v4param)); 242 return NULL; 243 } 244 return v4param; 245 } 246 247 return NULL; 248 } 249 250 /* do sanity check to trigger table */ 251 static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab) 252 { 253 if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger)) 254 return -EINVAL; 255 if (trigger_tab->table_size > PAGE_SIZE || 256 trigger_tab->table_size < trigger_tab->header_size) 257 return -EINVAL; 258 if (trigger_tab->entry_count != 259 (trigger_tab->table_size - trigger_tab->header_size) / 260 sizeof(struct acpi_einj_entry)) 261 return -EINVAL; 262 263 return 0; 264 } 265 266 static struct acpi_generic_address *einj_get_trigger_parameter_region( 267 struct acpi_einj_trigger *trigger_tab, u64 param1, u64 param2) 268 { 269 int i; 270 struct acpi_whea_header *entry; 271 272 entry = (struct acpi_whea_header *) 273 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger)); 274 for (i = 0; i < trigger_tab->entry_count; i++) { 275 if (entry->action == ACPI_EINJ_TRIGGER_ERROR && 276 entry->instruction <= ACPI_EINJ_WRITE_REGISTER_VALUE && 277 entry->register_region.space_id == 278 ACPI_ADR_SPACE_SYSTEM_MEMORY && 279 (entry->register_region.address & param2) == (param1 & param2)) 280 return &entry->register_region; 281 entry++; 282 } 283 284 return NULL; 285 } 286 /* Execute instructions in trigger error action table */ 287 static int __einj_error_trigger(u64 trigger_paddr, u32 type, 288 u64 param1, u64 param2) 289 { 290 struct acpi_einj_trigger *trigger_tab = NULL; 291 struct apei_exec_context trigger_ctx; 292 struct apei_resources trigger_resources; 293 struct acpi_whea_header *trigger_entry; 294 struct resource *r; 295 u32 table_size; 296 int rc = -EIO; 297 struct acpi_generic_address *trigger_param_region = NULL; 298 299 r = request_mem_region(trigger_paddr, sizeof(*trigger_tab), 300 "APEI EINJ Trigger Table"); 301 if (!r) { 302 pr_err("Can not request [mem %#010llx-%#010llx] for Trigger table\n", 303 (unsigned long long)trigger_paddr, 304 (unsigned long long)trigger_paddr + 305 sizeof(*trigger_tab) - 1); 306 goto out; 307 } 308 trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab)); 309 if (!trigger_tab) { 310 pr_err("Failed to map trigger table!\n"); 311 goto out_rel_header; 312 } 313 rc = einj_check_trigger_header(trigger_tab); 314 if (rc) { 315 pr_warn(FW_BUG "Invalid trigger error action table.\n"); 316 goto out_rel_header; 317 } 318 319 /* No action structures in the TRIGGER_ERROR table, nothing to do */ 320 if (!trigger_tab->entry_count) 321 goto out_rel_header; 322 323 rc = -EIO; 324 table_size = trigger_tab->table_size; 325 r = request_mem_region(trigger_paddr + sizeof(*trigger_tab), 326 table_size - sizeof(*trigger_tab), 327 "APEI EINJ Trigger Table"); 328 if (!r) { 329 pr_err("Can not request [mem %#010llx-%#010llx] for Trigger Table Entry\n", 330 (unsigned long long)trigger_paddr + sizeof(*trigger_tab), 331 (unsigned long long)trigger_paddr + table_size - 1); 332 goto out_rel_header; 333 } 334 iounmap(trigger_tab); 335 trigger_tab = ioremap_cache(trigger_paddr, table_size); 336 if (!trigger_tab) { 337 pr_err("Failed to map trigger table!\n"); 338 goto out_rel_entry; 339 } 340 trigger_entry = (struct acpi_whea_header *) 341 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger)); 342 apei_resources_init(&trigger_resources); 343 apei_exec_ctx_init(&trigger_ctx, einj_ins_type, 344 ARRAY_SIZE(einj_ins_type), 345 trigger_entry, trigger_tab->entry_count); 346 rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources); 347 if (rc) 348 goto out_fini; 349 rc = apei_resources_sub(&trigger_resources, &einj_resources); 350 if (rc) 351 goto out_fini; 352 /* 353 * Some firmware will access target address specified in 354 * param1 to trigger the error when injecting memory error. 355 * This will cause resource conflict with regular memory. So 356 * remove it from trigger table resources. 357 */ 358 if ((param_extension || acpi5) && (type & MEM_ERROR_MASK) && param2) { 359 struct apei_resources addr_resources; 360 apei_resources_init(&addr_resources); 361 trigger_param_region = einj_get_trigger_parameter_region( 362 trigger_tab, param1, param2); 363 if (trigger_param_region) { 364 rc = apei_resources_add(&addr_resources, 365 trigger_param_region->address, 366 trigger_param_region->bit_width/8, true); 367 if (rc) 368 goto out_fini; 369 rc = apei_resources_sub(&trigger_resources, 370 &addr_resources); 371 } 372 apei_resources_fini(&addr_resources); 373 if (rc) 374 goto out_fini; 375 } 376 rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger"); 377 if (rc) 378 goto out_fini; 379 rc = apei_exec_pre_map_gars(&trigger_ctx); 380 if (rc) 381 goto out_release; 382 383 rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR); 384 385 apei_exec_post_unmap_gars(&trigger_ctx); 386 out_release: 387 apei_resources_release(&trigger_resources); 388 out_fini: 389 apei_resources_fini(&trigger_resources); 390 out_rel_entry: 391 release_mem_region(trigger_paddr + sizeof(*trigger_tab), 392 table_size - sizeof(*trigger_tab)); 393 out_rel_header: 394 release_mem_region(trigger_paddr, sizeof(*trigger_tab)); 395 out: 396 if (trigger_tab) 397 iounmap(trigger_tab); 398 399 return rc; 400 } 401 402 static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, 403 u64 param3, u64 param4) 404 { 405 struct apei_exec_context ctx; 406 u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT; 407 int rc; 408 409 einj_exec_ctx_init(&ctx); 410 411 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION); 412 if (rc) 413 return rc; 414 apei_exec_ctx_set_input(&ctx, type); 415 if (acpi5) { 416 struct set_error_type_with_address *v5param = einj_param; 417 418 v5param->type = type; 419 if (type & ACPI5_VENDOR_BIT) { 420 switch (vendor_flags) { 421 case SETWA_FLAGS_APICID: 422 v5param->apicid = param1; 423 break; 424 case SETWA_FLAGS_MEM: 425 v5param->memory_address = param1; 426 v5param->memory_address_range = param2; 427 break; 428 case SETWA_FLAGS_PCIE_SBDF: 429 v5param->pcie_sbdf = param1; 430 break; 431 } 432 v5param->flags = vendor_flags; 433 } else if (flags) { 434 v5param->flags = flags; 435 v5param->memory_address = param1; 436 v5param->memory_address_range = param2; 437 v5param->apicid = param3; 438 v5param->pcie_sbdf = param4; 439 } else { 440 switch (type) { 441 case ACPI_EINJ_PROCESSOR_CORRECTABLE: 442 case ACPI_EINJ_PROCESSOR_UNCORRECTABLE: 443 case ACPI_EINJ_PROCESSOR_FATAL: 444 v5param->apicid = param1; 445 v5param->flags = SETWA_FLAGS_APICID; 446 break; 447 case ACPI_EINJ_MEMORY_CORRECTABLE: 448 case ACPI_EINJ_MEMORY_UNCORRECTABLE: 449 case ACPI_EINJ_MEMORY_FATAL: 450 v5param->memory_address = param1; 451 v5param->memory_address_range = param2; 452 v5param->flags = SETWA_FLAGS_MEM; 453 break; 454 case ACPI_EINJ_PCIX_CORRECTABLE: 455 case ACPI_EINJ_PCIX_UNCORRECTABLE: 456 case ACPI_EINJ_PCIX_FATAL: 457 v5param->pcie_sbdf = param1; 458 v5param->flags = SETWA_FLAGS_PCIE_SBDF; 459 break; 460 } 461 } 462 } else { 463 rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE); 464 if (rc) 465 return rc; 466 if (einj_param) { 467 struct einj_parameter *v4param = einj_param; 468 v4param->param1 = param1; 469 v4param->param2 = param2; 470 } 471 } 472 rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION); 473 if (rc) 474 return rc; 475 for (;;) { 476 rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS); 477 if (rc) 478 return rc; 479 val = apei_exec_ctx_get_output(&ctx); 480 if (!(val & EINJ_OP_BUSY)) 481 break; 482 if (einj_timedout(&timeout)) 483 return -EIO; 484 } 485 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS); 486 if (rc) 487 return rc; 488 val = apei_exec_ctx_get_output(&ctx); 489 if (val != EINJ_STATUS_SUCCESS) 490 return -EBUSY; 491 492 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE); 493 if (rc) 494 return rc; 495 trigger_paddr = apei_exec_ctx_get_output(&ctx); 496 if (notrigger == 0) { 497 rc = __einj_error_trigger(trigger_paddr, type, param1, param2); 498 if (rc) 499 return rc; 500 } 501 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION); 502 503 return rc; 504 } 505 506 /* Inject the specified hardware error */ 507 static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, 508 u64 param3, u64 param4) 509 { 510 int rc; 511 u64 base_addr, size; 512 513 /* If user manually set "flags", make sure it is legal */ 514 if (flags && (flags & 515 ~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF))) 516 return -EINVAL; 517 518 /* 519 * We need extra sanity checks for memory errors. 520 * Other types leap directly to injection. 521 */ 522 523 /* ensure param1/param2 existed */ 524 if (!(param_extension || acpi5)) 525 goto inject; 526 527 /* ensure injection is memory related */ 528 if (type & ACPI5_VENDOR_BIT) { 529 if (vendor_flags != SETWA_FLAGS_MEM) 530 goto inject; 531 } else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM)) 532 goto inject; 533 534 /* 535 * Disallow crazy address masks that give BIOS leeway to pick 536 * injection address almost anywhere. Insist on page or 537 * better granularity and that target address is normal RAM or 538 * NVDIMM. 539 */ 540 base_addr = param1 & param2; 541 size = ~param2 + 1; 542 543 if (((param2 & PAGE_MASK) != PAGE_MASK) || 544 ((region_intersects(base_addr, size, IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE) 545 != REGION_INTERSECTS) && 546 (region_intersects(base_addr, size, IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY) 547 != REGION_INTERSECTS))) 548 return -EINVAL; 549 550 inject: 551 mutex_lock(&einj_mutex); 552 rc = __einj_error_inject(type, flags, param1, param2, param3, param4); 553 mutex_unlock(&einj_mutex); 554 555 return rc; 556 } 557 558 static u32 error_type; 559 static u32 error_flags; 560 static u64 error_param1; 561 static u64 error_param2; 562 static u64 error_param3; 563 static u64 error_param4; 564 static struct dentry *einj_debug_dir; 565 566 static int available_error_type_show(struct seq_file *m, void *v) 567 { 568 int rc; 569 u32 available_error_type = 0; 570 571 rc = einj_get_available_error_type(&available_error_type); 572 if (rc) 573 return rc; 574 if (available_error_type & 0x0001) 575 seq_printf(m, "0x00000001\tProcessor Correctable\n"); 576 if (available_error_type & 0x0002) 577 seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n"); 578 if (available_error_type & 0x0004) 579 seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n"); 580 if (available_error_type & 0x0008) 581 seq_printf(m, "0x00000008\tMemory Correctable\n"); 582 if (available_error_type & 0x0010) 583 seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n"); 584 if (available_error_type & 0x0020) 585 seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n"); 586 if (available_error_type & 0x0040) 587 seq_printf(m, "0x00000040\tPCI Express Correctable\n"); 588 if (available_error_type & 0x0080) 589 seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n"); 590 if (available_error_type & 0x0100) 591 seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n"); 592 if (available_error_type & 0x0200) 593 seq_printf(m, "0x00000200\tPlatform Correctable\n"); 594 if (available_error_type & 0x0400) 595 seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n"); 596 if (available_error_type & 0x0800) 597 seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n"); 598 599 return 0; 600 } 601 602 DEFINE_SHOW_ATTRIBUTE(available_error_type); 603 604 static int error_type_get(void *data, u64 *val) 605 { 606 *val = error_type; 607 608 return 0; 609 } 610 611 static int error_type_set(void *data, u64 val) 612 { 613 int rc; 614 u32 available_error_type = 0; 615 u32 tval, vendor; 616 617 /* 618 * Vendor defined types have 0x80000000 bit set, and 619 * are not enumerated by ACPI_EINJ_GET_ERROR_TYPE 620 */ 621 vendor = val & ACPI5_VENDOR_BIT; 622 tval = val & 0x7fffffff; 623 624 /* Only one error type can be specified */ 625 if (tval & (tval - 1)) 626 return -EINVAL; 627 if (!vendor) { 628 rc = einj_get_available_error_type(&available_error_type); 629 if (rc) 630 return rc; 631 if (!(val & available_error_type)) 632 return -EINVAL; 633 } 634 error_type = val; 635 636 return 0; 637 } 638 639 DEFINE_DEBUGFS_ATTRIBUTE(error_type_fops, error_type_get, error_type_set, 640 "0x%llx\n"); 641 642 static int error_inject_set(void *data, u64 val) 643 { 644 if (!error_type) 645 return -EINVAL; 646 647 return einj_error_inject(error_type, error_flags, error_param1, error_param2, 648 error_param3, error_param4); 649 } 650 651 DEFINE_DEBUGFS_ATTRIBUTE(error_inject_fops, NULL, error_inject_set, "%llu\n"); 652 653 static int einj_check_table(struct acpi_table_einj *einj_tab) 654 { 655 if ((einj_tab->header_length != 656 (sizeof(struct acpi_table_einj) - sizeof(einj_tab->header))) 657 && (einj_tab->header_length != sizeof(struct acpi_table_einj))) 658 return -EINVAL; 659 if (einj_tab->header.length < sizeof(struct acpi_table_einj)) 660 return -EINVAL; 661 if (einj_tab->entries != 662 (einj_tab->header.length - sizeof(struct acpi_table_einj)) / 663 sizeof(struct acpi_einj_entry)) 664 return -EINVAL; 665 666 return 0; 667 } 668 669 static int __init einj_init(void) 670 { 671 int rc; 672 acpi_status status; 673 struct apei_exec_context ctx; 674 675 if (acpi_disabled) { 676 pr_warn("ACPI disabled.\n"); 677 return -ENODEV; 678 } 679 680 status = acpi_get_table(ACPI_SIG_EINJ, 0, 681 (struct acpi_table_header **)&einj_tab); 682 if (status == AE_NOT_FOUND) { 683 pr_warn("EINJ table not found.\n"); 684 return -ENODEV; 685 } 686 else if (ACPI_FAILURE(status)) { 687 pr_err("Failed to get EINJ table: %s\n", 688 acpi_format_exception(status)); 689 return -EINVAL; 690 } 691 692 rc = einj_check_table(einj_tab); 693 if (rc) { 694 pr_warn(FW_BUG "Invalid EINJ table.\n"); 695 goto err_put_table; 696 } 697 698 rc = -ENOMEM; 699 einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir()); 700 701 debugfs_create_file("available_error_type", S_IRUSR, einj_debug_dir, 702 NULL, &available_error_type_fops); 703 debugfs_create_file_unsafe("error_type", 0600, einj_debug_dir, 704 NULL, &error_type_fops); 705 debugfs_create_file_unsafe("error_inject", 0200, einj_debug_dir, 706 NULL, &error_inject_fops); 707 708 apei_resources_init(&einj_resources); 709 einj_exec_ctx_init(&ctx); 710 rc = apei_exec_collect_resources(&ctx, &einj_resources); 711 if (rc) { 712 pr_err("Error collecting EINJ resources.\n"); 713 goto err_fini; 714 } 715 716 rc = apei_resources_request(&einj_resources, "APEI EINJ"); 717 if (rc) { 718 pr_err("Error requesting memory/port resources.\n"); 719 goto err_fini; 720 } 721 722 rc = apei_exec_pre_map_gars(&ctx); 723 if (rc) { 724 pr_err("Error pre-mapping GARs.\n"); 725 goto err_release; 726 } 727 728 einj_param = einj_get_parameter_address(); 729 if ((param_extension || acpi5) && einj_param) { 730 debugfs_create_x32("flags", S_IRUSR | S_IWUSR, einj_debug_dir, 731 &error_flags); 732 debugfs_create_x64("param1", S_IRUSR | S_IWUSR, einj_debug_dir, 733 &error_param1); 734 debugfs_create_x64("param2", S_IRUSR | S_IWUSR, einj_debug_dir, 735 &error_param2); 736 debugfs_create_x64("param3", S_IRUSR | S_IWUSR, einj_debug_dir, 737 &error_param3); 738 debugfs_create_x64("param4", S_IRUSR | S_IWUSR, einj_debug_dir, 739 &error_param4); 740 debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR, 741 einj_debug_dir, ¬rigger); 742 } 743 744 if (vendor_dev[0]) { 745 vendor_blob.data = vendor_dev; 746 vendor_blob.size = strlen(vendor_dev); 747 debugfs_create_blob("vendor", S_IRUSR, einj_debug_dir, 748 &vendor_blob); 749 debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR, 750 einj_debug_dir, &vendor_flags); 751 } 752 753 pr_info("Error INJection is initialized.\n"); 754 755 return 0; 756 757 err_release: 758 apei_resources_release(&einj_resources); 759 err_fini: 760 apei_resources_fini(&einj_resources); 761 debugfs_remove_recursive(einj_debug_dir); 762 err_put_table: 763 acpi_put_table((struct acpi_table_header *)einj_tab); 764 765 return rc; 766 } 767 768 static void __exit einj_exit(void) 769 { 770 struct apei_exec_context ctx; 771 772 if (einj_param) { 773 acpi_size size = (acpi5) ? 774 sizeof(struct set_error_type_with_address) : 775 sizeof(struct einj_parameter); 776 777 acpi_os_unmap_iomem(einj_param, size); 778 } 779 einj_exec_ctx_init(&ctx); 780 apei_exec_post_unmap_gars(&ctx); 781 apei_resources_release(&einj_resources); 782 apei_resources_fini(&einj_resources); 783 debugfs_remove_recursive(einj_debug_dir); 784 acpi_put_table((struct acpi_table_header *)einj_tab); 785 } 786 787 module_init(einj_init); 788 module_exit(einj_exit); 789 790 MODULE_AUTHOR("Huang Ying"); 791 MODULE_DESCRIPTION("APEI Error INJection support"); 792 MODULE_LICENSE("GPL"); 793