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 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 */ 26 27 #include <linux/kernel.h> 28 #include <linux/module.h> 29 #include <linux/init.h> 30 #include <linux/io.h> 31 #include <linux/debugfs.h> 32 #include <linux/seq_file.h> 33 #include <linux/nmi.h> 34 #include <linux/delay.h> 35 #include <linux/mm.h> 36 #include <asm/unaligned.h> 37 38 #include "apei-internal.h" 39 40 #define EINJ_PFX "EINJ: " 41 42 #define SPIN_UNIT 100 /* 100ns */ 43 /* Firmware should respond within 1 milliseconds */ 44 #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC) 45 #define ACPI5_VENDOR_BIT BIT(31) 46 #define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \ 47 ACPI_EINJ_MEMORY_UNCORRECTABLE | \ 48 ACPI_EINJ_MEMORY_FATAL) 49 50 /* 51 * ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action. 52 */ 53 static int acpi5; 54 55 struct set_error_type_with_address { 56 u32 type; 57 u32 vendor_extension; 58 u32 flags; 59 u32 apicid; 60 u64 memory_address; 61 u64 memory_address_range; 62 u32 pcie_sbdf; 63 }; 64 enum { 65 SETWA_FLAGS_APICID = 1, 66 SETWA_FLAGS_MEM = 2, 67 SETWA_FLAGS_PCIE_SBDF = 4, 68 }; 69 70 /* 71 * Vendor extensions for platform specific operations 72 */ 73 struct vendor_error_type_extension { 74 u32 length; 75 u32 pcie_sbdf; 76 u16 vendor_id; 77 u16 device_id; 78 u8 rev_id; 79 u8 reserved[3]; 80 }; 81 82 static u32 notrigger; 83 84 static u32 vendor_flags; 85 static struct debugfs_blob_wrapper vendor_blob; 86 static char vendor_dev[64]; 87 88 /* 89 * Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the 90 * EINJ table through an unpublished extension. Use with caution as 91 * most will ignore the parameter and make their own choice of address 92 * for error injection. This extension is used only if 93 * param_extension module parameter is specified. 94 */ 95 struct einj_parameter { 96 u64 type; 97 u64 reserved1; 98 u64 reserved2; 99 u64 param1; 100 u64 param2; 101 }; 102 103 #define EINJ_OP_BUSY 0x1 104 #define EINJ_STATUS_SUCCESS 0x0 105 #define EINJ_STATUS_FAIL 0x1 106 #define EINJ_STATUS_INVAL 0x2 107 108 #define EINJ_TAB_ENTRY(tab) \ 109 ((struct acpi_whea_header *)((char *)(tab) + \ 110 sizeof(struct acpi_table_einj))) 111 112 static bool param_extension; 113 module_param(param_extension, bool, 0); 114 115 static struct acpi_table_einj *einj_tab; 116 117 static struct apei_resources einj_resources; 118 119 static struct apei_exec_ins_type einj_ins_type[] = { 120 [ACPI_EINJ_READ_REGISTER] = { 121 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 122 .run = apei_exec_read_register, 123 }, 124 [ACPI_EINJ_READ_REGISTER_VALUE] = { 125 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 126 .run = apei_exec_read_register_value, 127 }, 128 [ACPI_EINJ_WRITE_REGISTER] = { 129 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 130 .run = apei_exec_write_register, 131 }, 132 [ACPI_EINJ_WRITE_REGISTER_VALUE] = { 133 .flags = APEI_EXEC_INS_ACCESS_REGISTER, 134 .run = apei_exec_write_register_value, 135 }, 136 [ACPI_EINJ_NOOP] = { 137 .flags = 0, 138 .run = apei_exec_noop, 139 }, 140 }; 141 142 /* 143 * Prevent EINJ interpreter to run simultaneously, because the 144 * corresponding firmware implementation may not work properly when 145 * invoked simultaneously. 146 */ 147 static DEFINE_MUTEX(einj_mutex); 148 149 static void *einj_param; 150 151 static void einj_exec_ctx_init(struct apei_exec_context *ctx) 152 { 153 apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type), 154 EINJ_TAB_ENTRY(einj_tab), einj_tab->entries); 155 } 156 157 static int __einj_get_available_error_type(u32 *type) 158 { 159 struct apei_exec_context ctx; 160 int rc; 161 162 einj_exec_ctx_init(&ctx); 163 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE); 164 if (rc) 165 return rc; 166 *type = apei_exec_ctx_get_output(&ctx); 167 168 return 0; 169 } 170 171 /* Get error injection capabilities of the platform */ 172 static int einj_get_available_error_type(u32 *type) 173 { 174 int rc; 175 176 mutex_lock(&einj_mutex); 177 rc = __einj_get_available_error_type(type); 178 mutex_unlock(&einj_mutex); 179 180 return rc; 181 } 182 183 static int einj_timedout(u64 *t) 184 { 185 if ((s64)*t < SPIN_UNIT) { 186 pr_warning(FW_WARN EINJ_PFX 187 "Firmware does not respond in time\n"); 188 return 1; 189 } 190 *t -= SPIN_UNIT; 191 ndelay(SPIN_UNIT); 192 touch_nmi_watchdog(); 193 return 0; 194 } 195 196 static void check_vendor_extension(u64 paddr, 197 struct set_error_type_with_address *v5param) 198 { 199 int offset = v5param->vendor_extension; 200 struct vendor_error_type_extension *v; 201 u32 sbdf; 202 203 if (!offset) 204 return; 205 v = acpi_os_map_memory(paddr + offset, sizeof(*v)); 206 if (!v) 207 return; 208 sbdf = v->pcie_sbdf; 209 sprintf(vendor_dev, "%x:%x:%x.%x vendor_id=%x device_id=%x rev_id=%x\n", 210 sbdf >> 24, (sbdf >> 16) & 0xff, 211 (sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7, 212 v->vendor_id, v->device_id, v->rev_id); 213 acpi_os_unmap_memory(v, sizeof(*v)); 214 } 215 216 static void *einj_get_parameter_address(void) 217 { 218 int i; 219 u64 pa_v4 = 0, pa_v5 = 0; 220 struct acpi_whea_header *entry; 221 222 entry = EINJ_TAB_ENTRY(einj_tab); 223 for (i = 0; i < einj_tab->entries; i++) { 224 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE && 225 entry->instruction == ACPI_EINJ_WRITE_REGISTER && 226 entry->register_region.space_id == 227 ACPI_ADR_SPACE_SYSTEM_MEMORY) 228 pa_v4 = get_unaligned(&entry->register_region.address); 229 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS && 230 entry->instruction == ACPI_EINJ_WRITE_REGISTER && 231 entry->register_region.space_id == 232 ACPI_ADR_SPACE_SYSTEM_MEMORY) 233 pa_v5 = get_unaligned(&entry->register_region.address); 234 entry++; 235 } 236 if (pa_v5) { 237 struct set_error_type_with_address *v5param; 238 239 v5param = acpi_os_map_memory(pa_v5, sizeof(*v5param)); 240 if (v5param) { 241 acpi5 = 1; 242 check_vendor_extension(pa_v5, v5param); 243 return v5param; 244 } 245 } 246 if (param_extension && pa_v4) { 247 struct einj_parameter *v4param; 248 249 v4param = acpi_os_map_memory(pa_v4, sizeof(*v4param)); 250 if (!v4param) 251 return NULL; 252 if (v4param->reserved1 || v4param->reserved2) { 253 acpi_os_unmap_memory(v4param, sizeof(*v4param)); 254 return NULL; 255 } 256 return v4param; 257 } 258 259 return NULL; 260 } 261 262 /* do sanity check to trigger table */ 263 static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab) 264 { 265 if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger)) 266 return -EINVAL; 267 if (trigger_tab->table_size > PAGE_SIZE || 268 trigger_tab->table_size < trigger_tab->header_size) 269 return -EINVAL; 270 if (trigger_tab->entry_count != 271 (trigger_tab->table_size - trigger_tab->header_size) / 272 sizeof(struct acpi_einj_entry)) 273 return -EINVAL; 274 275 return 0; 276 } 277 278 static struct acpi_generic_address *einj_get_trigger_parameter_region( 279 struct acpi_einj_trigger *trigger_tab, u64 param1, u64 param2) 280 { 281 int i; 282 struct acpi_whea_header *entry; 283 284 entry = (struct acpi_whea_header *) 285 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger)); 286 for (i = 0; i < trigger_tab->entry_count; i++) { 287 if (entry->action == ACPI_EINJ_TRIGGER_ERROR && 288 entry->instruction == ACPI_EINJ_WRITE_REGISTER_VALUE && 289 entry->register_region.space_id == 290 ACPI_ADR_SPACE_SYSTEM_MEMORY && 291 (entry->register_region.address & param2) == (param1 & param2)) 292 return &entry->register_region; 293 entry++; 294 } 295 296 return NULL; 297 } 298 /* Execute instructions in trigger error action table */ 299 static int __einj_error_trigger(u64 trigger_paddr, u32 type, 300 u64 param1, u64 param2) 301 { 302 struct acpi_einj_trigger *trigger_tab = NULL; 303 struct apei_exec_context trigger_ctx; 304 struct apei_resources trigger_resources; 305 struct acpi_whea_header *trigger_entry; 306 struct resource *r; 307 u32 table_size; 308 int rc = -EIO; 309 struct acpi_generic_address *trigger_param_region = NULL; 310 311 r = request_mem_region(trigger_paddr, sizeof(*trigger_tab), 312 "APEI EINJ Trigger Table"); 313 if (!r) { 314 pr_err(EINJ_PFX 315 "Can not request [mem %#010llx-%#010llx] for Trigger table\n", 316 (unsigned long long)trigger_paddr, 317 (unsigned long long)trigger_paddr + 318 sizeof(*trigger_tab) - 1); 319 goto out; 320 } 321 trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab)); 322 if (!trigger_tab) { 323 pr_err(EINJ_PFX "Failed to map trigger table!\n"); 324 goto out_rel_header; 325 } 326 rc = einj_check_trigger_header(trigger_tab); 327 if (rc) { 328 pr_warning(FW_BUG EINJ_PFX 329 "The trigger error action table is invalid\n"); 330 goto out_rel_header; 331 } 332 333 /* No action structures in the TRIGGER_ERROR table, nothing to do */ 334 if (!trigger_tab->entry_count) 335 goto out_rel_header; 336 337 rc = -EIO; 338 table_size = trigger_tab->table_size; 339 r = request_mem_region(trigger_paddr + sizeof(*trigger_tab), 340 table_size - sizeof(*trigger_tab), 341 "APEI EINJ Trigger Table"); 342 if (!r) { 343 pr_err(EINJ_PFX 344 "Can not request [mem %#010llx-%#010llx] for Trigger Table Entry\n", 345 (unsigned long long)trigger_paddr + sizeof(*trigger_tab), 346 (unsigned long long)trigger_paddr + table_size - 1); 347 goto out_rel_header; 348 } 349 iounmap(trigger_tab); 350 trigger_tab = ioremap_cache(trigger_paddr, table_size); 351 if (!trigger_tab) { 352 pr_err(EINJ_PFX "Failed to map trigger table!\n"); 353 goto out_rel_entry; 354 } 355 trigger_entry = (struct acpi_whea_header *) 356 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger)); 357 apei_resources_init(&trigger_resources); 358 apei_exec_ctx_init(&trigger_ctx, einj_ins_type, 359 ARRAY_SIZE(einj_ins_type), 360 trigger_entry, trigger_tab->entry_count); 361 rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources); 362 if (rc) 363 goto out_fini; 364 rc = apei_resources_sub(&trigger_resources, &einj_resources); 365 if (rc) 366 goto out_fini; 367 /* 368 * Some firmware will access target address specified in 369 * param1 to trigger the error when injecting memory error. 370 * This will cause resource conflict with regular memory. So 371 * remove it from trigger table resources. 372 */ 373 if ((param_extension || acpi5) && (type & MEM_ERROR_MASK) && param2) { 374 struct apei_resources addr_resources; 375 apei_resources_init(&addr_resources); 376 trigger_param_region = einj_get_trigger_parameter_region( 377 trigger_tab, param1, param2); 378 if (trigger_param_region) { 379 rc = apei_resources_add(&addr_resources, 380 trigger_param_region->address, 381 trigger_param_region->bit_width/8, true); 382 if (rc) 383 goto out_fini; 384 rc = apei_resources_sub(&trigger_resources, 385 &addr_resources); 386 } 387 apei_resources_fini(&addr_resources); 388 if (rc) 389 goto out_fini; 390 } 391 rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger"); 392 if (rc) 393 goto out_fini; 394 rc = apei_exec_pre_map_gars(&trigger_ctx); 395 if (rc) 396 goto out_release; 397 398 rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR); 399 400 apei_exec_post_unmap_gars(&trigger_ctx); 401 out_release: 402 apei_resources_release(&trigger_resources); 403 out_fini: 404 apei_resources_fini(&trigger_resources); 405 out_rel_entry: 406 release_mem_region(trigger_paddr + sizeof(*trigger_tab), 407 table_size - sizeof(*trigger_tab)); 408 out_rel_header: 409 release_mem_region(trigger_paddr, sizeof(*trigger_tab)); 410 out: 411 if (trigger_tab) 412 iounmap(trigger_tab); 413 414 return rc; 415 } 416 417 static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, 418 u64 param3, u64 param4) 419 { 420 struct apei_exec_context ctx; 421 u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT; 422 int rc; 423 424 einj_exec_ctx_init(&ctx); 425 426 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION); 427 if (rc) 428 return rc; 429 apei_exec_ctx_set_input(&ctx, type); 430 if (acpi5) { 431 struct set_error_type_with_address *v5param = einj_param; 432 433 v5param->type = type; 434 if (type & ACPI5_VENDOR_BIT) { 435 switch (vendor_flags) { 436 case SETWA_FLAGS_APICID: 437 v5param->apicid = param1; 438 break; 439 case SETWA_FLAGS_MEM: 440 v5param->memory_address = param1; 441 v5param->memory_address_range = param2; 442 break; 443 case SETWA_FLAGS_PCIE_SBDF: 444 v5param->pcie_sbdf = param1; 445 break; 446 } 447 v5param->flags = vendor_flags; 448 } else if (flags) { 449 v5param->flags = flags; 450 v5param->memory_address = param1; 451 v5param->memory_address_range = param2; 452 v5param->apicid = param3; 453 v5param->pcie_sbdf = param4; 454 } else { 455 switch (type) { 456 case ACPI_EINJ_PROCESSOR_CORRECTABLE: 457 case ACPI_EINJ_PROCESSOR_UNCORRECTABLE: 458 case ACPI_EINJ_PROCESSOR_FATAL: 459 v5param->apicid = param1; 460 v5param->flags = SETWA_FLAGS_APICID; 461 break; 462 case ACPI_EINJ_MEMORY_CORRECTABLE: 463 case ACPI_EINJ_MEMORY_UNCORRECTABLE: 464 case ACPI_EINJ_MEMORY_FATAL: 465 v5param->memory_address = param1; 466 v5param->memory_address_range = param2; 467 v5param->flags = SETWA_FLAGS_MEM; 468 break; 469 case ACPI_EINJ_PCIX_CORRECTABLE: 470 case ACPI_EINJ_PCIX_UNCORRECTABLE: 471 case ACPI_EINJ_PCIX_FATAL: 472 v5param->pcie_sbdf = param1; 473 v5param->flags = SETWA_FLAGS_PCIE_SBDF; 474 break; 475 } 476 } 477 } else { 478 rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE); 479 if (rc) 480 return rc; 481 if (einj_param) { 482 struct einj_parameter *v4param = einj_param; 483 v4param->param1 = param1; 484 v4param->param2 = param2; 485 } 486 } 487 rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION); 488 if (rc) 489 return rc; 490 for (;;) { 491 rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS); 492 if (rc) 493 return rc; 494 val = apei_exec_ctx_get_output(&ctx); 495 if (!(val & EINJ_OP_BUSY)) 496 break; 497 if (einj_timedout(&timeout)) 498 return -EIO; 499 } 500 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS); 501 if (rc) 502 return rc; 503 val = apei_exec_ctx_get_output(&ctx); 504 if (val != EINJ_STATUS_SUCCESS) 505 return -EBUSY; 506 507 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE); 508 if (rc) 509 return rc; 510 trigger_paddr = apei_exec_ctx_get_output(&ctx); 511 if (notrigger == 0) { 512 rc = __einj_error_trigger(trigger_paddr, type, param1, param2); 513 if (rc) 514 return rc; 515 } 516 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION); 517 518 return rc; 519 } 520 521 /* Inject the specified hardware error */ 522 static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, 523 u64 param3, u64 param4) 524 { 525 int rc; 526 unsigned long pfn; 527 528 /* If user manually set "flags", make sure it is legal */ 529 if (flags && (flags & 530 ~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF))) 531 return -EINVAL; 532 533 /* 534 * We need extra sanity checks for memory errors. 535 * Other types leap directly to injection. 536 */ 537 538 /* ensure param1/param2 existed */ 539 if (!(param_extension || acpi5)) 540 goto inject; 541 542 /* ensure injection is memory related */ 543 if (type & ACPI5_VENDOR_BIT) { 544 if (vendor_flags != SETWA_FLAGS_MEM) 545 goto inject; 546 } else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM)) 547 goto inject; 548 549 /* 550 * Disallow crazy address masks that give BIOS leeway to pick 551 * injection address almost anywhere. Insist on page or 552 * better granularity and that target address is normal RAM. 553 */ 554 pfn = PFN_DOWN(param1 & param2); 555 if (!page_is_ram(pfn) || ((param2 & PAGE_MASK) != PAGE_MASK)) 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 static int available_error_type_open(struct inode *inode, struct file *file) 611 { 612 return single_open(file, available_error_type_show, NULL); 613 } 614 615 static const struct file_operations available_error_type_fops = { 616 .open = available_error_type_open, 617 .read = seq_read, 618 .llseek = seq_lseek, 619 .release = single_release, 620 }; 621 622 static int error_type_get(void *data, u64 *val) 623 { 624 *val = error_type; 625 626 return 0; 627 } 628 629 static int error_type_set(void *data, u64 val) 630 { 631 int rc; 632 u32 available_error_type = 0; 633 u32 tval, vendor; 634 635 /* 636 * Vendor defined types have 0x80000000 bit set, and 637 * are not enumerated by ACPI_EINJ_GET_ERROR_TYPE 638 */ 639 vendor = val & ACPI5_VENDOR_BIT; 640 tval = val & 0x7fffffff; 641 642 /* Only one error type can be specified */ 643 if (tval & (tval - 1)) 644 return -EINVAL; 645 if (!vendor) { 646 rc = einj_get_available_error_type(&available_error_type); 647 if (rc) 648 return rc; 649 if (!(val & available_error_type)) 650 return -EINVAL; 651 } 652 error_type = val; 653 654 return 0; 655 } 656 657 DEFINE_SIMPLE_ATTRIBUTE(error_type_fops, error_type_get, 658 error_type_set, "0x%llx\n"); 659 660 static int error_inject_set(void *data, u64 val) 661 { 662 if (!error_type) 663 return -EINVAL; 664 665 return einj_error_inject(error_type, error_flags, error_param1, error_param2, 666 error_param3, error_param4); 667 } 668 669 DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL, 670 error_inject_set, "%llu\n"); 671 672 static int einj_check_table(struct acpi_table_einj *einj_tab) 673 { 674 if ((einj_tab->header_length != 675 (sizeof(struct acpi_table_einj) - sizeof(einj_tab->header))) 676 && (einj_tab->header_length != sizeof(struct acpi_table_einj))) 677 return -EINVAL; 678 if (einj_tab->header.length < sizeof(struct acpi_table_einj)) 679 return -EINVAL; 680 if (einj_tab->entries != 681 (einj_tab->header.length - sizeof(struct acpi_table_einj)) / 682 sizeof(struct acpi_einj_entry)) 683 return -EINVAL; 684 685 return 0; 686 } 687 688 static int __init einj_init(void) 689 { 690 int rc; 691 acpi_status status; 692 struct dentry *fentry; 693 struct apei_exec_context ctx; 694 695 if (acpi_disabled) 696 return -ENODEV; 697 698 status = acpi_get_table(ACPI_SIG_EINJ, 0, 699 (struct acpi_table_header **)&einj_tab); 700 if (status == AE_NOT_FOUND) 701 return -ENODEV; 702 else if (ACPI_FAILURE(status)) { 703 const char *msg = acpi_format_exception(status); 704 pr_err(EINJ_PFX "Failed to get table, %s\n", msg); 705 return -EINVAL; 706 } 707 708 rc = einj_check_table(einj_tab); 709 if (rc) { 710 pr_warning(FW_BUG EINJ_PFX "EINJ table is invalid\n"); 711 return -EINVAL; 712 } 713 714 rc = -ENOMEM; 715 einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir()); 716 if (!einj_debug_dir) 717 goto err_cleanup; 718 fentry = debugfs_create_file("available_error_type", S_IRUSR, 719 einj_debug_dir, NULL, 720 &available_error_type_fops); 721 if (!fentry) 722 goto err_cleanup; 723 fentry = debugfs_create_file("error_type", S_IRUSR | S_IWUSR, 724 einj_debug_dir, NULL, &error_type_fops); 725 if (!fentry) 726 goto err_cleanup; 727 fentry = debugfs_create_file("error_inject", S_IWUSR, 728 einj_debug_dir, NULL, &error_inject_fops); 729 if (!fentry) 730 goto err_cleanup; 731 732 apei_resources_init(&einj_resources); 733 einj_exec_ctx_init(&ctx); 734 rc = apei_exec_collect_resources(&ctx, &einj_resources); 735 if (rc) 736 goto err_fini; 737 rc = apei_resources_request(&einj_resources, "APEI EINJ"); 738 if (rc) 739 goto err_fini; 740 rc = apei_exec_pre_map_gars(&ctx); 741 if (rc) 742 goto err_release; 743 744 rc = -ENOMEM; 745 einj_param = einj_get_parameter_address(); 746 if ((param_extension || acpi5) && einj_param) { 747 fentry = debugfs_create_x32("flags", S_IRUSR | S_IWUSR, 748 einj_debug_dir, &error_flags); 749 if (!fentry) 750 goto err_unmap; 751 fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR, 752 einj_debug_dir, &error_param1); 753 if (!fentry) 754 goto err_unmap; 755 fentry = debugfs_create_x64("param2", S_IRUSR | S_IWUSR, 756 einj_debug_dir, &error_param2); 757 if (!fentry) 758 goto err_unmap; 759 fentry = debugfs_create_x64("param3", S_IRUSR | S_IWUSR, 760 einj_debug_dir, &error_param3); 761 if (!fentry) 762 goto err_unmap; 763 fentry = debugfs_create_x64("param4", S_IRUSR | S_IWUSR, 764 einj_debug_dir, &error_param4); 765 if (!fentry) 766 goto err_unmap; 767 768 fentry = debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR, 769 einj_debug_dir, ¬rigger); 770 if (!fentry) 771 goto err_unmap; 772 } 773 774 if (vendor_dev[0]) { 775 vendor_blob.data = vendor_dev; 776 vendor_blob.size = strlen(vendor_dev); 777 fentry = debugfs_create_blob("vendor", S_IRUSR, 778 einj_debug_dir, &vendor_blob); 779 if (!fentry) 780 goto err_unmap; 781 fentry = debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR, 782 einj_debug_dir, &vendor_flags); 783 if (!fentry) 784 goto err_unmap; 785 } 786 787 pr_info(EINJ_PFX "Error INJection is initialized.\n"); 788 789 return 0; 790 791 err_unmap: 792 if (einj_param) { 793 acpi_size size = (acpi5) ? 794 sizeof(struct set_error_type_with_address) : 795 sizeof(struct einj_parameter); 796 797 acpi_os_unmap_memory(einj_param, size); 798 } 799 apei_exec_post_unmap_gars(&ctx); 800 err_release: 801 apei_resources_release(&einj_resources); 802 err_fini: 803 apei_resources_fini(&einj_resources); 804 err_cleanup: 805 debugfs_remove_recursive(einj_debug_dir); 806 807 return rc; 808 } 809 810 static void __exit einj_exit(void) 811 { 812 struct apei_exec_context ctx; 813 814 if (einj_param) { 815 acpi_size size = (acpi5) ? 816 sizeof(struct set_error_type_with_address) : 817 sizeof(struct einj_parameter); 818 819 acpi_os_unmap_memory(einj_param, size); 820 } 821 einj_exec_ctx_init(&ctx); 822 apei_exec_post_unmap_gars(&ctx); 823 apei_resources_release(&einj_resources); 824 apei_resources_fini(&einj_resources); 825 debugfs_remove_recursive(einj_debug_dir); 826 } 827 828 module_init(einj_init); 829 module_exit(einj_exit); 830 831 MODULE_AUTHOR("Huang Ying"); 832 MODULE_DESCRIPTION("APEI Error INJection support"); 833 MODULE_LICENSE("GPL"); 834