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 #define EINJ_PFX "EINJ: " 37 38 #define SPIN_UNIT 100 /* 100ns */ 39 /* Firmware should respond within 1 milliseconds */ 40 #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC) 41 #define ACPI5_VENDOR_BIT BIT(31) 42 #define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \ 43 ACPI_EINJ_MEMORY_UNCORRECTABLE | \ 44 ACPI_EINJ_MEMORY_FATAL) 45 46 /* 47 * ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action. 48 */ 49 static int acpi5; 50 51 struct set_error_type_with_address { 52 u32 type; 53 u32 vendor_extension; 54 u32 flags; 55 u32 apicid; 56 u64 memory_address; 57 u64 memory_address_range; 58 u32 pcie_sbdf; 59 }; 60 enum { 61 SETWA_FLAGS_APICID = 1, 62 SETWA_FLAGS_MEM = 2, 63 SETWA_FLAGS_PCIE_SBDF = 4, 64 }; 65 66 /* 67 * Vendor extensions for platform specific operations 68 */ 69 struct vendor_error_type_extension { 70 u32 length; 71 u32 pcie_sbdf; 72 u16 vendor_id; 73 u16 device_id; 74 u8 rev_id; 75 u8 reserved[3]; 76 }; 77 78 static u32 notrigger; 79 80 static u32 vendor_flags; 81 static struct debugfs_blob_wrapper vendor_blob; 82 static char vendor_dev[64]; 83 84 /* 85 * Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the 86 * EINJ table through an unpublished extension. Use with caution as 87 * most will ignore the parameter and make their own choice of address 88 * for error injection. This extension is used only if 89 * param_extension module parameter is specified. 90 */ 91 struct einj_parameter { 92 u64 type; 93 u64 reserved1; 94 u64 reserved2; 95 u64 param1; 96 u64 param2; 97 }; 98 99 #define EINJ_OP_BUSY 0x1 100 #define EINJ_STATUS_SUCCESS 0x0 101 #define EINJ_STATUS_FAIL 0x1 102 #define EINJ_STATUS_INVAL 0x2 103 104 #define EINJ_TAB_ENTRY(tab) \ 105 ((struct acpi_whea_header *)((char *)(tab) + \ 106 sizeof(struct acpi_table_einj))) 107 108 static bool param_extension; 109 module_param(param_extension, bool, 0); 110 111 static struct acpi_table_einj *einj_tab; 112 113 static struct apei_resources einj_resources; 114 115 static struct apei_exec_ins_type einj_ins_type[] = { 116 [ACPI_EINJ_READ_REGISTER] = { 117 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 118 .run = apei_exec_read_register, 119 }, 120 [ACPI_EINJ_READ_REGISTER_VALUE] = { 121 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 122 .run = apei_exec_read_register_value, 123 }, 124 [ACPI_EINJ_WRITE_REGISTER] = { 125 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 126 .run = apei_exec_write_register, 127 }, 128 [ACPI_EINJ_WRITE_REGISTER_VALUE] = { 129 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 130 .run = apei_exec_write_register_value, 131 }, 132 [ACPI_EINJ_NOOP] = { 133 .flags = 0, 134 .run = apei_exec_noop, 135 }, 136 }; 137 138 /* 139 * Prevent EINJ interpreter to run simultaneously, because the 140 * corresponding firmware implementation may not work properly when 141 * invoked simultaneously. 142 */ 143 static DEFINE_MUTEX(einj_mutex); 144 145 static void *einj_param; 146 147 static void einj_exec_ctx_init(struct apei_exec_context *ctx) 148 { 149 apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type), 150 EINJ_TAB_ENTRY(einj_tab), einj_tab->entries); 151 } 152 153 static int __einj_get_available_error_type(u32 *type) 154 { 155 struct apei_exec_context ctx; 156 int rc; 157 158 einj_exec_ctx_init(&ctx); 159 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE); 160 if (rc) 161 return rc; 162 *type = apei_exec_ctx_get_output(&ctx); 163 164 return 0; 165 } 166 167 /* Get error injection capabilities of the platform */ 168 static int einj_get_available_error_type(u32 *type) 169 { 170 int rc; 171 172 mutex_lock(&einj_mutex); 173 rc = __einj_get_available_error_type(type); 174 mutex_unlock(&einj_mutex); 175 176 return rc; 177 } 178 179 static int einj_timedout(u64 *t) 180 { 181 if ((s64)*t < SPIN_UNIT) { 182 pr_warning(FW_WARN EINJ_PFX 183 "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(EINJ_PFX 311 "Can not request [mem %#010llx-%#010llx] for Trigger table\n", 312 (unsigned long long)trigger_paddr, 313 (unsigned long long)trigger_paddr + 314 sizeof(*trigger_tab) - 1); 315 goto out; 316 } 317 trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab)); 318 if (!trigger_tab) { 319 pr_err(EINJ_PFX "Failed to map trigger table!\n"); 320 goto out_rel_header; 321 } 322 rc = einj_check_trigger_header(trigger_tab); 323 if (rc) { 324 pr_warning(FW_BUG EINJ_PFX 325 "The trigger error action table is invalid\n"); 326 goto out_rel_header; 327 } 328 329 /* No action structures in the TRIGGER_ERROR table, nothing to do */ 330 if (!trigger_tab->entry_count) 331 goto out_rel_header; 332 333 rc = -EIO; 334 table_size = trigger_tab->table_size; 335 r = request_mem_region(trigger_paddr + sizeof(*trigger_tab), 336 table_size - sizeof(*trigger_tab), 337 "APEI EINJ Trigger Table"); 338 if (!r) { 339 pr_err(EINJ_PFX 340 "Can not request [mem %#010llx-%#010llx] for Trigger Table Entry\n", 341 (unsigned long long)trigger_paddr + sizeof(*trigger_tab), 342 (unsigned long long)trigger_paddr + table_size - 1); 343 goto out_rel_header; 344 } 345 iounmap(trigger_tab); 346 trigger_tab = ioremap_cache(trigger_paddr, table_size); 347 if (!trigger_tab) { 348 pr_err(EINJ_PFX "Failed to map trigger table!\n"); 349 goto out_rel_entry; 350 } 351 trigger_entry = (struct acpi_whea_header *) 352 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger)); 353 apei_resources_init(&trigger_resources); 354 apei_exec_ctx_init(&trigger_ctx, einj_ins_type, 355 ARRAY_SIZE(einj_ins_type), 356 trigger_entry, trigger_tab->entry_count); 357 rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources); 358 if (rc) 359 goto out_fini; 360 rc = apei_resources_sub(&trigger_resources, &einj_resources); 361 if (rc) 362 goto out_fini; 363 /* 364 * Some firmware will access target address specified in 365 * param1 to trigger the error when injecting memory error. 366 * This will cause resource conflict with regular memory. So 367 * remove it from trigger table resources. 368 */ 369 if ((param_extension || acpi5) && (type & MEM_ERROR_MASK) && param2) { 370 struct apei_resources addr_resources; 371 apei_resources_init(&addr_resources); 372 trigger_param_region = einj_get_trigger_parameter_region( 373 trigger_tab, param1, param2); 374 if (trigger_param_region) { 375 rc = apei_resources_add(&addr_resources, 376 trigger_param_region->address, 377 trigger_param_region->bit_width/8, true); 378 if (rc) 379 goto out_fini; 380 rc = apei_resources_sub(&trigger_resources, 381 &addr_resources); 382 } 383 apei_resources_fini(&addr_resources); 384 if (rc) 385 goto out_fini; 386 } 387 rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger"); 388 if (rc) 389 goto out_fini; 390 rc = apei_exec_pre_map_gars(&trigger_ctx); 391 if (rc) 392 goto out_release; 393 394 rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR); 395 396 apei_exec_post_unmap_gars(&trigger_ctx); 397 out_release: 398 apei_resources_release(&trigger_resources); 399 out_fini: 400 apei_resources_fini(&trigger_resources); 401 out_rel_entry: 402 release_mem_region(trigger_paddr + sizeof(*trigger_tab), 403 table_size - sizeof(*trigger_tab)); 404 out_rel_header: 405 release_mem_region(trigger_paddr, sizeof(*trigger_tab)); 406 out: 407 if (trigger_tab) 408 iounmap(trigger_tab); 409 410 return rc; 411 } 412 413 static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, 414 u64 param3, u64 param4) 415 { 416 struct apei_exec_context ctx; 417 u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT; 418 int rc; 419 420 einj_exec_ctx_init(&ctx); 421 422 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION); 423 if (rc) 424 return rc; 425 apei_exec_ctx_set_input(&ctx, type); 426 if (acpi5) { 427 struct set_error_type_with_address *v5param = einj_param; 428 429 v5param->type = type; 430 if (type & ACPI5_VENDOR_BIT) { 431 switch (vendor_flags) { 432 case SETWA_FLAGS_APICID: 433 v5param->apicid = param1; 434 break; 435 case SETWA_FLAGS_MEM: 436 v5param->memory_address = param1; 437 v5param->memory_address_range = param2; 438 break; 439 case SETWA_FLAGS_PCIE_SBDF: 440 v5param->pcie_sbdf = param1; 441 break; 442 } 443 v5param->flags = vendor_flags; 444 } else if (flags) { 445 v5param->flags = flags; 446 v5param->memory_address = param1; 447 v5param->memory_address_range = param2; 448 v5param->apicid = param3; 449 v5param->pcie_sbdf = param4; 450 } else { 451 switch (type) { 452 case ACPI_EINJ_PROCESSOR_CORRECTABLE: 453 case ACPI_EINJ_PROCESSOR_UNCORRECTABLE: 454 case ACPI_EINJ_PROCESSOR_FATAL: 455 v5param->apicid = param1; 456 v5param->flags = SETWA_FLAGS_APICID; 457 break; 458 case ACPI_EINJ_MEMORY_CORRECTABLE: 459 case ACPI_EINJ_MEMORY_UNCORRECTABLE: 460 case ACPI_EINJ_MEMORY_FATAL: 461 v5param->memory_address = param1; 462 v5param->memory_address_range = param2; 463 v5param->flags = SETWA_FLAGS_MEM; 464 break; 465 case ACPI_EINJ_PCIX_CORRECTABLE: 466 case ACPI_EINJ_PCIX_UNCORRECTABLE: 467 case ACPI_EINJ_PCIX_FATAL: 468 v5param->pcie_sbdf = param1; 469 v5param->flags = SETWA_FLAGS_PCIE_SBDF; 470 break; 471 } 472 } 473 } else { 474 rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE); 475 if (rc) 476 return rc; 477 if (einj_param) { 478 struct einj_parameter *v4param = einj_param; 479 v4param->param1 = param1; 480 v4param->param2 = param2; 481 } 482 } 483 rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION); 484 if (rc) 485 return rc; 486 for (;;) { 487 rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS); 488 if (rc) 489 return rc; 490 val = apei_exec_ctx_get_output(&ctx); 491 if (!(val & EINJ_OP_BUSY)) 492 break; 493 if (einj_timedout(&timeout)) 494 return -EIO; 495 } 496 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS); 497 if (rc) 498 return rc; 499 val = apei_exec_ctx_get_output(&ctx); 500 if (val != EINJ_STATUS_SUCCESS) 501 return -EBUSY; 502 503 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE); 504 if (rc) 505 return rc; 506 trigger_paddr = apei_exec_ctx_get_output(&ctx); 507 if (notrigger == 0) { 508 rc = __einj_error_trigger(trigger_paddr, type, param1, param2); 509 if (rc) 510 return rc; 511 } 512 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION); 513 514 return rc; 515 } 516 517 /* Inject the specified hardware error */ 518 static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, 519 u64 param3, u64 param4) 520 { 521 int rc; 522 u64 base_addr, size; 523 524 /* If user manually set "flags", make sure it is legal */ 525 if (flags && (flags & 526 ~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF))) 527 return -EINVAL; 528 529 /* 530 * We need extra sanity checks for memory errors. 531 * Other types leap directly to injection. 532 */ 533 534 /* ensure param1/param2 existed */ 535 if (!(param_extension || acpi5)) 536 goto inject; 537 538 /* ensure injection is memory related */ 539 if (type & ACPI5_VENDOR_BIT) { 540 if (vendor_flags != SETWA_FLAGS_MEM) 541 goto inject; 542 } else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM)) 543 goto inject; 544 545 /* 546 * Disallow crazy address masks that give BIOS leeway to pick 547 * injection address almost anywhere. Insist on page or 548 * better granularity and that target address is normal RAM or 549 * NVDIMM. 550 */ 551 base_addr = param1 & param2; 552 size = ~param2 + 1; 553 554 if (((param2 & PAGE_MASK) != PAGE_MASK) || 555 ((region_intersects(base_addr, size, IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE) 556 != REGION_INTERSECTS) && 557 (region_intersects(base_addr, size, IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY) 558 != REGION_INTERSECTS))) 559 return -EINVAL; 560 561 inject: 562 mutex_lock(&einj_mutex); 563 rc = __einj_error_inject(type, flags, param1, param2, param3, param4); 564 mutex_unlock(&einj_mutex); 565 566 return rc; 567 } 568 569 static u32 error_type; 570 static u32 error_flags; 571 static u64 error_param1; 572 static u64 error_param2; 573 static u64 error_param3; 574 static u64 error_param4; 575 static struct dentry *einj_debug_dir; 576 577 static int available_error_type_show(struct seq_file *m, void *v) 578 { 579 int rc; 580 u32 available_error_type = 0; 581 582 rc = einj_get_available_error_type(&available_error_type); 583 if (rc) 584 return rc; 585 if (available_error_type & 0x0001) 586 seq_printf(m, "0x00000001\tProcessor Correctable\n"); 587 if (available_error_type & 0x0002) 588 seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n"); 589 if (available_error_type & 0x0004) 590 seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n"); 591 if (available_error_type & 0x0008) 592 seq_printf(m, "0x00000008\tMemory Correctable\n"); 593 if (available_error_type & 0x0010) 594 seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n"); 595 if (available_error_type & 0x0020) 596 seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n"); 597 if (available_error_type & 0x0040) 598 seq_printf(m, "0x00000040\tPCI Express Correctable\n"); 599 if (available_error_type & 0x0080) 600 seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n"); 601 if (available_error_type & 0x0100) 602 seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n"); 603 if (available_error_type & 0x0200) 604 seq_printf(m, "0x00000200\tPlatform Correctable\n"); 605 if (available_error_type & 0x0400) 606 seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n"); 607 if (available_error_type & 0x0800) 608 seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n"); 609 610 return 0; 611 } 612 613 static int available_error_type_open(struct inode *inode, struct file *file) 614 { 615 return single_open(file, available_error_type_show, NULL); 616 } 617 618 static const struct file_operations available_error_type_fops = { 619 .open = available_error_type_open, 620 .read = seq_read, 621 .llseek = seq_lseek, 622 .release = single_release, 623 }; 624 625 static int error_type_get(void *data, u64 *val) 626 { 627 *val = error_type; 628 629 return 0; 630 } 631 632 static int error_type_set(void *data, u64 val) 633 { 634 int rc; 635 u32 available_error_type = 0; 636 u32 tval, vendor; 637 638 /* 639 * Vendor defined types have 0x80000000 bit set, and 640 * are not enumerated by ACPI_EINJ_GET_ERROR_TYPE 641 */ 642 vendor = val & ACPI5_VENDOR_BIT; 643 tval = val & 0x7fffffff; 644 645 /* Only one error type can be specified */ 646 if (tval & (tval - 1)) 647 return -EINVAL; 648 if (!vendor) { 649 rc = einj_get_available_error_type(&available_error_type); 650 if (rc) 651 return rc; 652 if (!(val & available_error_type)) 653 return -EINVAL; 654 } 655 error_type = val; 656 657 return 0; 658 } 659 660 DEFINE_SIMPLE_ATTRIBUTE(error_type_fops, error_type_get, 661 error_type_set, "0x%llx\n"); 662 663 static int error_inject_set(void *data, u64 val) 664 { 665 if (!error_type) 666 return -EINVAL; 667 668 return einj_error_inject(error_type, error_flags, error_param1, error_param2, 669 error_param3, error_param4); 670 } 671 672 DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL, 673 error_inject_set, "%llu\n"); 674 675 static int einj_check_table(struct acpi_table_einj *einj_tab) 676 { 677 if ((einj_tab->header_length != 678 (sizeof(struct acpi_table_einj) - sizeof(einj_tab->header))) 679 && (einj_tab->header_length != sizeof(struct acpi_table_einj))) 680 return -EINVAL; 681 if (einj_tab->header.length < sizeof(struct acpi_table_einj)) 682 return -EINVAL; 683 if (einj_tab->entries != 684 (einj_tab->header.length - sizeof(struct acpi_table_einj)) / 685 sizeof(struct acpi_einj_entry)) 686 return -EINVAL; 687 688 return 0; 689 } 690 691 static int __init einj_init(void) 692 { 693 int rc; 694 acpi_status status; 695 struct dentry *fentry; 696 struct apei_exec_context ctx; 697 698 if (acpi_disabled) 699 return -ENODEV; 700 701 status = acpi_get_table(ACPI_SIG_EINJ, 0, 702 (struct acpi_table_header **)&einj_tab); 703 if (status == AE_NOT_FOUND) 704 return -ENODEV; 705 else if (ACPI_FAILURE(status)) { 706 const char *msg = acpi_format_exception(status); 707 pr_err(EINJ_PFX "Failed to get table, %s\n", msg); 708 return -EINVAL; 709 } 710 711 rc = einj_check_table(einj_tab); 712 if (rc) { 713 pr_warning(FW_BUG EINJ_PFX "EINJ table is invalid\n"); 714 return -EINVAL; 715 } 716 717 rc = -ENOMEM; 718 einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir()); 719 if (!einj_debug_dir) 720 goto err_cleanup; 721 fentry = debugfs_create_file("available_error_type", S_IRUSR, 722 einj_debug_dir, NULL, 723 &available_error_type_fops); 724 if (!fentry) 725 goto err_cleanup; 726 fentry = debugfs_create_file("error_type", S_IRUSR | S_IWUSR, 727 einj_debug_dir, NULL, &error_type_fops); 728 if (!fentry) 729 goto err_cleanup; 730 fentry = debugfs_create_file("error_inject", S_IWUSR, 731 einj_debug_dir, NULL, &error_inject_fops); 732 if (!fentry) 733 goto err_cleanup; 734 735 apei_resources_init(&einj_resources); 736 einj_exec_ctx_init(&ctx); 737 rc = apei_exec_collect_resources(&ctx, &einj_resources); 738 if (rc) 739 goto err_fini; 740 rc = apei_resources_request(&einj_resources, "APEI EINJ"); 741 if (rc) 742 goto err_fini; 743 rc = apei_exec_pre_map_gars(&ctx); 744 if (rc) 745 goto err_release; 746 747 rc = -ENOMEM; 748 einj_param = einj_get_parameter_address(); 749 if ((param_extension || acpi5) && einj_param) { 750 fentry = debugfs_create_x32("flags", S_IRUSR | S_IWUSR, 751 einj_debug_dir, &error_flags); 752 if (!fentry) 753 goto err_unmap; 754 fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR, 755 einj_debug_dir, &error_param1); 756 if (!fentry) 757 goto err_unmap; 758 fentry = debugfs_create_x64("param2", S_IRUSR | S_IWUSR, 759 einj_debug_dir, &error_param2); 760 if (!fentry) 761 goto err_unmap; 762 fentry = debugfs_create_x64("param3", S_IRUSR | S_IWUSR, 763 einj_debug_dir, &error_param3); 764 if (!fentry) 765 goto err_unmap; 766 fentry = debugfs_create_x64("param4", S_IRUSR | S_IWUSR, 767 einj_debug_dir, &error_param4); 768 if (!fentry) 769 goto err_unmap; 770 771 fentry = debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR, 772 einj_debug_dir, ¬rigger); 773 if (!fentry) 774 goto err_unmap; 775 } 776 777 if (vendor_dev[0]) { 778 vendor_blob.data = vendor_dev; 779 vendor_blob.size = strlen(vendor_dev); 780 fentry = debugfs_create_blob("vendor", S_IRUSR, 781 einj_debug_dir, &vendor_blob); 782 if (!fentry) 783 goto err_unmap; 784 fentry = debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR, 785 einj_debug_dir, &vendor_flags); 786 if (!fentry) 787 goto err_unmap; 788 } 789 790 pr_info(EINJ_PFX "Error INJection is initialized.\n"); 791 792 return 0; 793 794 err_unmap: 795 if (einj_param) { 796 acpi_size size = (acpi5) ? 797 sizeof(struct set_error_type_with_address) : 798 sizeof(struct einj_parameter); 799 800 acpi_os_unmap_iomem(einj_param, size); 801 } 802 apei_exec_post_unmap_gars(&ctx); 803 err_release: 804 apei_resources_release(&einj_resources); 805 err_fini: 806 apei_resources_fini(&einj_resources); 807 err_cleanup: 808 debugfs_remove_recursive(einj_debug_dir); 809 810 return rc; 811 } 812 813 static void __exit einj_exit(void) 814 { 815 struct apei_exec_context ctx; 816 817 if (einj_param) { 818 acpi_size size = (acpi5) ? 819 sizeof(struct set_error_type_with_address) : 820 sizeof(struct einj_parameter); 821 822 acpi_os_unmap_iomem(einj_param, size); 823 } 824 einj_exec_ctx_init(&ctx); 825 apei_exec_post_unmap_gars(&ctx); 826 apei_resources_release(&einj_resources); 827 apei_resources_fini(&einj_resources); 828 debugfs_remove_recursive(einj_debug_dir); 829 } 830 831 module_init(einj_init); 832 module_exit(einj_exit); 833 834 MODULE_AUTHOR("Huang Ying"); 835 MODULE_DESCRIPTION("APEI Error INJection support"); 836 MODULE_LICENSE("GPL"); 837