1 /* 2 * APEI Error INJection support 3 * 4 * EINJ provides a hardware error injection mechanism, this is useful 5 * for debugging and testing of other APEI and RAS features. 6 * 7 * For more information about EINJ, please refer to ACPI Specification 8 * version 4.0, section 17.5. 9 * 10 * Copyright 2009-2010 Intel Corp. 11 * Author: Huang Ying <ying.huang@intel.com> 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License version 15 * 2 as published by the Free Software Foundation. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 */ 22 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/io.h> 27 #include <linux/debugfs.h> 28 #include <linux/seq_file.h> 29 #include <linux/nmi.h> 30 #include <linux/delay.h> 31 #include <linux/mm.h> 32 #include <asm/unaligned.h> 33 34 #include "apei-internal.h" 35 36 #undef pr_fmt 37 #define pr_fmt(fmt) "EINJ: " fmt 38 39 #define SPIN_UNIT 100 /* 100ns */ 40 /* Firmware should respond within 1 milliseconds */ 41 #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC) 42 #define ACPI5_VENDOR_BIT BIT(31) 43 #define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \ 44 ACPI_EINJ_MEMORY_UNCORRECTABLE | \ 45 ACPI_EINJ_MEMORY_FATAL) 46 47 /* 48 * ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action. 49 */ 50 static int acpi5; 51 52 struct set_error_type_with_address { 53 u32 type; 54 u32 vendor_extension; 55 u32 flags; 56 u32 apicid; 57 u64 memory_address; 58 u64 memory_address_range; 59 u32 pcie_sbdf; 60 }; 61 enum { 62 SETWA_FLAGS_APICID = 1, 63 SETWA_FLAGS_MEM = 2, 64 SETWA_FLAGS_PCIE_SBDF = 4, 65 }; 66 67 /* 68 * Vendor extensions for platform specific operations 69 */ 70 struct vendor_error_type_extension { 71 u32 length; 72 u32 pcie_sbdf; 73 u16 vendor_id; 74 u16 device_id; 75 u8 rev_id; 76 u8 reserved[3]; 77 }; 78 79 static u32 notrigger; 80 81 static u32 vendor_flags; 82 static struct debugfs_blob_wrapper vendor_blob; 83 static char vendor_dev[64]; 84 85 /* 86 * Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the 87 * EINJ table through an unpublished extension. Use with caution as 88 * most will ignore the parameter and make their own choice of address 89 * for error injection. This extension is used only if 90 * param_extension module parameter is specified. 91 */ 92 struct einj_parameter { 93 u64 type; 94 u64 reserved1; 95 u64 reserved2; 96 u64 param1; 97 u64 param2; 98 }; 99 100 #define EINJ_OP_BUSY 0x1 101 #define EINJ_STATUS_SUCCESS 0x0 102 #define EINJ_STATUS_FAIL 0x1 103 #define EINJ_STATUS_INVAL 0x2 104 105 #define EINJ_TAB_ENTRY(tab) \ 106 ((struct acpi_whea_header *)((char *)(tab) + \ 107 sizeof(struct acpi_table_einj))) 108 109 static bool param_extension; 110 module_param(param_extension, bool, 0); 111 112 static struct acpi_table_einj *einj_tab; 113 114 static struct apei_resources einj_resources; 115 116 static struct apei_exec_ins_type einj_ins_type[] = { 117 [ACPI_EINJ_READ_REGISTER] = { 118 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 119 .run = apei_exec_read_register, 120 }, 121 [ACPI_EINJ_READ_REGISTER_VALUE] = { 122 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 123 .run = apei_exec_read_register_value, 124 }, 125 [ACPI_EINJ_WRITE_REGISTER] = { 126 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 127 .run = apei_exec_write_register, 128 }, 129 [ACPI_EINJ_WRITE_REGISTER_VALUE] = { 130 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 131 .run = apei_exec_write_register_value, 132 }, 133 [ACPI_EINJ_NOOP] = { 134 .flags = 0, 135 .run = apei_exec_noop, 136 }, 137 }; 138 139 /* 140 * Prevent EINJ interpreter to run simultaneously, because the 141 * corresponding firmware implementation may not work properly when 142 * invoked simultaneously. 143 */ 144 static DEFINE_MUTEX(einj_mutex); 145 146 static void *einj_param; 147 148 static void einj_exec_ctx_init(struct apei_exec_context *ctx) 149 { 150 apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type), 151 EINJ_TAB_ENTRY(einj_tab), einj_tab->entries); 152 } 153 154 static int __einj_get_available_error_type(u32 *type) 155 { 156 struct apei_exec_context ctx; 157 int rc; 158 159 einj_exec_ctx_init(&ctx); 160 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE); 161 if (rc) 162 return rc; 163 *type = apei_exec_ctx_get_output(&ctx); 164 165 return 0; 166 } 167 168 /* Get error injection capabilities of the platform */ 169 static int einj_get_available_error_type(u32 *type) 170 { 171 int rc; 172 173 mutex_lock(&einj_mutex); 174 rc = __einj_get_available_error_type(type); 175 mutex_unlock(&einj_mutex); 176 177 return rc; 178 } 179 180 static int einj_timedout(u64 *t) 181 { 182 if ((s64)*t < SPIN_UNIT) { 183 pr_warning(FW_WARN "Firmware does not respond in time\n"); 184 return 1; 185 } 186 *t -= SPIN_UNIT; 187 ndelay(SPIN_UNIT); 188 touch_nmi_watchdog(); 189 return 0; 190 } 191 192 static void check_vendor_extension(u64 paddr, 193 struct set_error_type_with_address *v5param) 194 { 195 int offset = v5param->vendor_extension; 196 struct vendor_error_type_extension *v; 197 u32 sbdf; 198 199 if (!offset) 200 return; 201 v = acpi_os_map_iomem(paddr + offset, sizeof(*v)); 202 if (!v) 203 return; 204 sbdf = v->pcie_sbdf; 205 sprintf(vendor_dev, "%x:%x:%x.%x vendor_id=%x device_id=%x rev_id=%x\n", 206 sbdf >> 24, (sbdf >> 16) & 0xff, 207 (sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7, 208 v->vendor_id, v->device_id, v->rev_id); 209 acpi_os_unmap_iomem(v, sizeof(*v)); 210 } 211 212 static void *einj_get_parameter_address(void) 213 { 214 int i; 215 u64 pa_v4 = 0, pa_v5 = 0; 216 struct acpi_whea_header *entry; 217 218 entry = EINJ_TAB_ENTRY(einj_tab); 219 for (i = 0; i < einj_tab->entries; i++) { 220 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE && 221 entry->instruction == ACPI_EINJ_WRITE_REGISTER && 222 entry->register_region.space_id == 223 ACPI_ADR_SPACE_SYSTEM_MEMORY) 224 pa_v4 = get_unaligned(&entry->register_region.address); 225 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS && 226 entry->instruction == ACPI_EINJ_WRITE_REGISTER && 227 entry->register_region.space_id == 228 ACPI_ADR_SPACE_SYSTEM_MEMORY) 229 pa_v5 = get_unaligned(&entry->register_region.address); 230 entry++; 231 } 232 if (pa_v5) { 233 struct set_error_type_with_address *v5param; 234 235 v5param = acpi_os_map_iomem(pa_v5, sizeof(*v5param)); 236 if (v5param) { 237 acpi5 = 1; 238 check_vendor_extension(pa_v5, v5param); 239 return v5param; 240 } 241 } 242 if (param_extension && pa_v4) { 243 struct einj_parameter *v4param; 244 245 v4param = acpi_os_map_iomem(pa_v4, sizeof(*v4param)); 246 if (!v4param) 247 return NULL; 248 if (v4param->reserved1 || v4param->reserved2) { 249 acpi_os_unmap_iomem(v4param, sizeof(*v4param)); 250 return NULL; 251 } 252 return v4param; 253 } 254 255 return NULL; 256 } 257 258 /* do sanity check to trigger table */ 259 static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab) 260 { 261 if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger)) 262 return -EINVAL; 263 if (trigger_tab->table_size > PAGE_SIZE || 264 trigger_tab->table_size < trigger_tab->header_size) 265 return -EINVAL; 266 if (trigger_tab->entry_count != 267 (trigger_tab->table_size - trigger_tab->header_size) / 268 sizeof(struct acpi_einj_entry)) 269 return -EINVAL; 270 271 return 0; 272 } 273 274 static struct acpi_generic_address *einj_get_trigger_parameter_region( 275 struct acpi_einj_trigger *trigger_tab, u64 param1, u64 param2) 276 { 277 int i; 278 struct acpi_whea_header *entry; 279 280 entry = (struct acpi_whea_header *) 281 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger)); 282 for (i = 0; i < trigger_tab->entry_count; i++) { 283 if (entry->action == ACPI_EINJ_TRIGGER_ERROR && 284 entry->instruction <= ACPI_EINJ_WRITE_REGISTER_VALUE && 285 entry->register_region.space_id == 286 ACPI_ADR_SPACE_SYSTEM_MEMORY && 287 (entry->register_region.address & param2) == (param1 & param2)) 288 return &entry->register_region; 289 entry++; 290 } 291 292 return NULL; 293 } 294 /* Execute instructions in trigger error action table */ 295 static int __einj_error_trigger(u64 trigger_paddr, u32 type, 296 u64 param1, u64 param2) 297 { 298 struct acpi_einj_trigger *trigger_tab = NULL; 299 struct apei_exec_context trigger_ctx; 300 struct apei_resources trigger_resources; 301 struct acpi_whea_header *trigger_entry; 302 struct resource *r; 303 u32 table_size; 304 int rc = -EIO; 305 struct acpi_generic_address *trigger_param_region = NULL; 306 307 r = request_mem_region(trigger_paddr, sizeof(*trigger_tab), 308 "APEI EINJ Trigger Table"); 309 if (!r) { 310 pr_err("Can not request [mem %#010llx-%#010llx] for Trigger table\n", 311 (unsigned long long)trigger_paddr, 312 (unsigned long long)trigger_paddr + 313 sizeof(*trigger_tab) - 1); 314 goto out; 315 } 316 trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab)); 317 if (!trigger_tab) { 318 pr_err("Failed to map trigger table!\n"); 319 goto out_rel_header; 320 } 321 rc = einj_check_trigger_header(trigger_tab); 322 if (rc) { 323 pr_warning(FW_BUG "Invalid trigger error action table.\n"); 324 goto out_rel_header; 325 } 326 327 /* No action structures in the TRIGGER_ERROR table, nothing to do */ 328 if (!trigger_tab->entry_count) 329 goto out_rel_header; 330 331 rc = -EIO; 332 table_size = trigger_tab->table_size; 333 r = request_mem_region(trigger_paddr + sizeof(*trigger_tab), 334 table_size - sizeof(*trigger_tab), 335 "APEI EINJ Trigger Table"); 336 if (!r) { 337 pr_err("Can not request [mem %#010llx-%#010llx] for Trigger Table Entry\n", 338 (unsigned long long)trigger_paddr + sizeof(*trigger_tab), 339 (unsigned long long)trigger_paddr + table_size - 1); 340 goto out_rel_header; 341 } 342 iounmap(trigger_tab); 343 trigger_tab = ioremap_cache(trigger_paddr, table_size); 344 if (!trigger_tab) { 345 pr_err("Failed to map trigger table!\n"); 346 goto out_rel_entry; 347 } 348 trigger_entry = (struct acpi_whea_header *) 349 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger)); 350 apei_resources_init(&trigger_resources); 351 apei_exec_ctx_init(&trigger_ctx, einj_ins_type, 352 ARRAY_SIZE(einj_ins_type), 353 trigger_entry, trigger_tab->entry_count); 354 rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources); 355 if (rc) 356 goto out_fini; 357 rc = apei_resources_sub(&trigger_resources, &einj_resources); 358 if (rc) 359 goto out_fini; 360 /* 361 * Some firmware will access target address specified in 362 * param1 to trigger the error when injecting memory error. 363 * This will cause resource conflict with regular memory. So 364 * remove it from trigger table resources. 365 */ 366 if ((param_extension || acpi5) && (type & MEM_ERROR_MASK) && param2) { 367 struct apei_resources addr_resources; 368 apei_resources_init(&addr_resources); 369 trigger_param_region = einj_get_trigger_parameter_region( 370 trigger_tab, param1, param2); 371 if (trigger_param_region) { 372 rc = apei_resources_add(&addr_resources, 373 trigger_param_region->address, 374 trigger_param_region->bit_width/8, true); 375 if (rc) 376 goto out_fini; 377 rc = apei_resources_sub(&trigger_resources, 378 &addr_resources); 379 } 380 apei_resources_fini(&addr_resources); 381 if (rc) 382 goto out_fini; 383 } 384 rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger"); 385 if (rc) 386 goto out_fini; 387 rc = apei_exec_pre_map_gars(&trigger_ctx); 388 if (rc) 389 goto out_release; 390 391 rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR); 392 393 apei_exec_post_unmap_gars(&trigger_ctx); 394 out_release: 395 apei_resources_release(&trigger_resources); 396 out_fini: 397 apei_resources_fini(&trigger_resources); 398 out_rel_entry: 399 release_mem_region(trigger_paddr + sizeof(*trigger_tab), 400 table_size - sizeof(*trigger_tab)); 401 out_rel_header: 402 release_mem_region(trigger_paddr, sizeof(*trigger_tab)); 403 out: 404 if (trigger_tab) 405 iounmap(trigger_tab); 406 407 return rc; 408 } 409 410 static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, 411 u64 param3, u64 param4) 412 { 413 struct apei_exec_context ctx; 414 u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT; 415 int rc; 416 417 einj_exec_ctx_init(&ctx); 418 419 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION); 420 if (rc) 421 return rc; 422 apei_exec_ctx_set_input(&ctx, type); 423 if (acpi5) { 424 struct set_error_type_with_address *v5param = einj_param; 425 426 v5param->type = type; 427 if (type & ACPI5_VENDOR_BIT) { 428 switch (vendor_flags) { 429 case SETWA_FLAGS_APICID: 430 v5param->apicid = param1; 431 break; 432 case SETWA_FLAGS_MEM: 433 v5param->memory_address = param1; 434 v5param->memory_address_range = param2; 435 break; 436 case SETWA_FLAGS_PCIE_SBDF: 437 v5param->pcie_sbdf = param1; 438 break; 439 } 440 v5param->flags = vendor_flags; 441 } else if (flags) { 442 v5param->flags = flags; 443 v5param->memory_address = param1; 444 v5param->memory_address_range = param2; 445 v5param->apicid = param3; 446 v5param->pcie_sbdf = param4; 447 } else { 448 switch (type) { 449 case ACPI_EINJ_PROCESSOR_CORRECTABLE: 450 case ACPI_EINJ_PROCESSOR_UNCORRECTABLE: 451 case ACPI_EINJ_PROCESSOR_FATAL: 452 v5param->apicid = param1; 453 v5param->flags = SETWA_FLAGS_APICID; 454 break; 455 case ACPI_EINJ_MEMORY_CORRECTABLE: 456 case ACPI_EINJ_MEMORY_UNCORRECTABLE: 457 case ACPI_EINJ_MEMORY_FATAL: 458 v5param->memory_address = param1; 459 v5param->memory_address_range = param2; 460 v5param->flags = SETWA_FLAGS_MEM; 461 break; 462 case ACPI_EINJ_PCIX_CORRECTABLE: 463 case ACPI_EINJ_PCIX_UNCORRECTABLE: 464 case ACPI_EINJ_PCIX_FATAL: 465 v5param->pcie_sbdf = param1; 466 v5param->flags = SETWA_FLAGS_PCIE_SBDF; 467 break; 468 } 469 } 470 } else { 471 rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE); 472 if (rc) 473 return rc; 474 if (einj_param) { 475 struct einj_parameter *v4param = einj_param; 476 v4param->param1 = param1; 477 v4param->param2 = param2; 478 } 479 } 480 rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION); 481 if (rc) 482 return rc; 483 for (;;) { 484 rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS); 485 if (rc) 486 return rc; 487 val = apei_exec_ctx_get_output(&ctx); 488 if (!(val & EINJ_OP_BUSY)) 489 break; 490 if (einj_timedout(&timeout)) 491 return -EIO; 492 } 493 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS); 494 if (rc) 495 return rc; 496 val = apei_exec_ctx_get_output(&ctx); 497 if (val != EINJ_STATUS_SUCCESS) 498 return -EBUSY; 499 500 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE); 501 if (rc) 502 return rc; 503 trigger_paddr = apei_exec_ctx_get_output(&ctx); 504 if (notrigger == 0) { 505 rc = __einj_error_trigger(trigger_paddr, type, param1, param2); 506 if (rc) 507 return rc; 508 } 509 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION); 510 511 return rc; 512 } 513 514 /* Inject the specified hardware error */ 515 static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, 516 u64 param3, u64 param4) 517 { 518 int rc; 519 u64 base_addr, size; 520 521 /* If user manually set "flags", make sure it is legal */ 522 if (flags && (flags & 523 ~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF))) 524 return -EINVAL; 525 526 /* 527 * We need extra sanity checks for memory errors. 528 * Other types leap directly to injection. 529 */ 530 531 /* ensure param1/param2 existed */ 532 if (!(param_extension || acpi5)) 533 goto inject; 534 535 /* ensure injection is memory related */ 536 if (type & ACPI5_VENDOR_BIT) { 537 if (vendor_flags != SETWA_FLAGS_MEM) 538 goto inject; 539 } else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM)) 540 goto inject; 541 542 /* 543 * Disallow crazy address masks that give BIOS leeway to pick 544 * injection address almost anywhere. Insist on page or 545 * better granularity and that target address is normal RAM or 546 * NVDIMM. 547 */ 548 base_addr = param1 & param2; 549 size = ~param2 + 1; 550 551 if (((param2 & PAGE_MASK) != PAGE_MASK) || 552 ((region_intersects(base_addr, size, IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE) 553 != REGION_INTERSECTS) && 554 (region_intersects(base_addr, size, IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY) 555 != REGION_INTERSECTS))) 556 return -EINVAL; 557 558 inject: 559 mutex_lock(&einj_mutex); 560 rc = __einj_error_inject(type, flags, param1, param2, param3, param4); 561 mutex_unlock(&einj_mutex); 562 563 return rc; 564 } 565 566 static u32 error_type; 567 static u32 error_flags; 568 static u64 error_param1; 569 static u64 error_param2; 570 static u64 error_param3; 571 static u64 error_param4; 572 static struct dentry *einj_debug_dir; 573 574 static int available_error_type_show(struct seq_file *m, void *v) 575 { 576 int rc; 577 u32 available_error_type = 0; 578 579 rc = einj_get_available_error_type(&available_error_type); 580 if (rc) 581 return rc; 582 if (available_error_type & 0x0001) 583 seq_printf(m, "0x00000001\tProcessor Correctable\n"); 584 if (available_error_type & 0x0002) 585 seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n"); 586 if (available_error_type & 0x0004) 587 seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n"); 588 if (available_error_type & 0x0008) 589 seq_printf(m, "0x00000008\tMemory Correctable\n"); 590 if (available_error_type & 0x0010) 591 seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n"); 592 if (available_error_type & 0x0020) 593 seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n"); 594 if (available_error_type & 0x0040) 595 seq_printf(m, "0x00000040\tPCI Express Correctable\n"); 596 if (available_error_type & 0x0080) 597 seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n"); 598 if (available_error_type & 0x0100) 599 seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n"); 600 if (available_error_type & 0x0200) 601 seq_printf(m, "0x00000200\tPlatform Correctable\n"); 602 if (available_error_type & 0x0400) 603 seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n"); 604 if (available_error_type & 0x0800) 605 seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n"); 606 607 return 0; 608 } 609 610 DEFINE_SHOW_ATTRIBUTE(available_error_type); 611 612 static int error_type_get(void *data, u64 *val) 613 { 614 *val = error_type; 615 616 return 0; 617 } 618 619 static int error_type_set(void *data, u64 val) 620 { 621 int rc; 622 u32 available_error_type = 0; 623 u32 tval, vendor; 624 625 /* 626 * Vendor defined types have 0x80000000 bit set, and 627 * are not enumerated by ACPI_EINJ_GET_ERROR_TYPE 628 */ 629 vendor = val & ACPI5_VENDOR_BIT; 630 tval = val & 0x7fffffff; 631 632 /* Only one error type can be specified */ 633 if (tval & (tval - 1)) 634 return -EINVAL; 635 if (!vendor) { 636 rc = einj_get_available_error_type(&available_error_type); 637 if (rc) 638 return rc; 639 if (!(val & available_error_type)) 640 return -EINVAL; 641 } 642 error_type = val; 643 644 return 0; 645 } 646 647 DEFINE_DEBUGFS_ATTRIBUTE(error_type_fops, error_type_get, error_type_set, 648 "0x%llx\n"); 649 650 static int error_inject_set(void *data, u64 val) 651 { 652 if (!error_type) 653 return -EINVAL; 654 655 return einj_error_inject(error_type, error_flags, error_param1, error_param2, 656 error_param3, error_param4); 657 } 658 659 DEFINE_DEBUGFS_ATTRIBUTE(error_inject_fops, NULL, error_inject_set, "%llu\n"); 660 661 static int einj_check_table(struct acpi_table_einj *einj_tab) 662 { 663 if ((einj_tab->header_length != 664 (sizeof(struct acpi_table_einj) - sizeof(einj_tab->header))) 665 && (einj_tab->header_length != sizeof(struct acpi_table_einj))) 666 return -EINVAL; 667 if (einj_tab->header.length < sizeof(struct acpi_table_einj)) 668 return -EINVAL; 669 if (einj_tab->entries != 670 (einj_tab->header.length - sizeof(struct acpi_table_einj)) / 671 sizeof(struct acpi_einj_entry)) 672 return -EINVAL; 673 674 return 0; 675 } 676 677 static int __init einj_init(void) 678 { 679 int rc; 680 acpi_status status; 681 struct apei_exec_context ctx; 682 683 if (acpi_disabled) { 684 pr_warn("ACPI disabled.\n"); 685 return -ENODEV; 686 } 687 688 status = acpi_get_table(ACPI_SIG_EINJ, 0, 689 (struct acpi_table_header **)&einj_tab); 690 if (status == AE_NOT_FOUND) { 691 pr_warn("EINJ table not found.\n"); 692 return -ENODEV; 693 } 694 else if (ACPI_FAILURE(status)) { 695 pr_err("Failed to get EINJ table: %s\n", 696 acpi_format_exception(status)); 697 return -EINVAL; 698 } 699 700 rc = einj_check_table(einj_tab); 701 if (rc) { 702 pr_warn(FW_BUG "Invalid EINJ table.\n"); 703 return -EINVAL; 704 } 705 706 rc = -ENOMEM; 707 einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir()); 708 709 debugfs_create_file("available_error_type", S_IRUSR, einj_debug_dir, 710 NULL, &available_error_type_fops); 711 debugfs_create_file_unsafe("error_type", 0600, einj_debug_dir, 712 NULL, &error_type_fops); 713 debugfs_create_file_unsafe("error_inject", 0200, einj_debug_dir, 714 NULL, &error_inject_fops); 715 716 apei_resources_init(&einj_resources); 717 einj_exec_ctx_init(&ctx); 718 rc = apei_exec_collect_resources(&ctx, &einj_resources); 719 if (rc) { 720 pr_err("Error collecting EINJ resources.\n"); 721 goto err_fini; 722 } 723 724 rc = apei_resources_request(&einj_resources, "APEI EINJ"); 725 if (rc) { 726 pr_err("Error requesting memory/port resources.\n"); 727 goto err_fini; 728 } 729 730 rc = apei_exec_pre_map_gars(&ctx); 731 if (rc) { 732 pr_err("Error pre-mapping GARs.\n"); 733 goto err_release; 734 } 735 736 rc = -ENOMEM; 737 einj_param = einj_get_parameter_address(); 738 if ((param_extension || acpi5) && einj_param) { 739 debugfs_create_x32("flags", S_IRUSR | S_IWUSR, einj_debug_dir, 740 &error_flags); 741 debugfs_create_x64("param1", S_IRUSR | S_IWUSR, einj_debug_dir, 742 &error_param1); 743 debugfs_create_x64("param2", S_IRUSR | S_IWUSR, einj_debug_dir, 744 &error_param2); 745 debugfs_create_x64("param3", S_IRUSR | S_IWUSR, einj_debug_dir, 746 &error_param3); 747 debugfs_create_x64("param4", S_IRUSR | S_IWUSR, einj_debug_dir, 748 &error_param4); 749 debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR, 750 einj_debug_dir, ¬rigger); 751 } 752 753 if (vendor_dev[0]) { 754 vendor_blob.data = vendor_dev; 755 vendor_blob.size = strlen(vendor_dev); 756 debugfs_create_blob("vendor", S_IRUSR, einj_debug_dir, 757 &vendor_blob); 758 debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR, 759 einj_debug_dir, &vendor_flags); 760 } 761 762 pr_info("Error INJection is initialized.\n"); 763 764 return 0; 765 766 err_release: 767 apei_resources_release(&einj_resources); 768 err_fini: 769 apei_resources_fini(&einj_resources); 770 debugfs_remove_recursive(einj_debug_dir); 771 772 return rc; 773 } 774 775 static void __exit einj_exit(void) 776 { 777 struct apei_exec_context ctx; 778 779 if (einj_param) { 780 acpi_size size = (acpi5) ? 781 sizeof(struct set_error_type_with_address) : 782 sizeof(struct einj_parameter); 783 784 acpi_os_unmap_iomem(einj_param, size); 785 } 786 einj_exec_ctx_init(&ctx); 787 apei_exec_post_unmap_gars(&ctx); 788 apei_resources_release(&einj_resources); 789 apei_resources_fini(&einj_resources); 790 debugfs_remove_recursive(einj_debug_dir); 791 } 792 793 module_init(einj_init); 794 module_exit(einj_exit); 795 796 MODULE_AUTHOR("Huang Ying"); 797 MODULE_DESCRIPTION("APEI Error INJection support"); 798 MODULE_LICENSE("GPL"); 799