linux/drivers/acpi/apei/einj.c
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   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 */
  42static int acpi5;
  43
  44struct 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};
  53enum {
  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 */
  62struct 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
  71static u32 notrigger;
  72
  73static u32 vendor_flags;
  74static struct debugfs_blob_wrapper vendor_blob;
  75static 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  79 * EINJ table through an unpublished extension.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 */
  84struct 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
 101static bool param_extension;
 102module_param(param_extension, bool, 0);
 103
 104static struct acpi_table_einj *einj_tab;
 105
 106static struct apei_resources einj_resources;
 107
 108static 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 */
 136static DEFINE_MUTEX(einj_mutex);
 137
 138static void *einj_param;
 139
 140static 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
 146static 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 */
 161static 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
 172static 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
 184static 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
 204static 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 */
 251static 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
 266static 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 */
 287static 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);
 386out_release:
 387        apei_resources_release(&trigger_resources);
 388out_fini:
 389        apei_resources_fini(&trigger_resources);
 390out_rel_entry:
 391        release_mem_region(trigger_paddr + sizeof(*trigger_tab),
 392                           table_size - sizeof(*trigger_tab));
 393out_rel_header:
 394        release_mem_region(trigger_paddr, sizeof(*trigger_tab));
 395out:
 396        if (trigger_tab)
 397                iounmap(trigger_tab);
 398
 399        return rc;
 400}
 401
 402static 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 */
 507static 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
 550inject:
 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
 558static u32 error_type;
 559static u32 error_flags;
 560static u64 error_param1;
 561static u64 error_param2;
 562static u64 error_param3;
 563static u64 error_param4;
 564static struct dentry *einj_debug_dir;
 565
 566static 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
 602DEFINE_SHOW_ATTRIBUTE(available_error_type);
 603
 604static int error_type_get(void *data, u64 *val)
 605{
 606        *val = error_type;
 607
 608        return 0;
 609}
 610
 611static 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
 639DEFINE_DEBUGFS_ATTRIBUTE(error_type_fops, error_type_get, error_type_set,
 640                         "0x%llx\n");
 641
 642static 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
 651DEFINE_DEBUGFS_ATTRIBUTE(error_inject_fops, NULL, error_inject_set, "%llu\n");
 652
 653static 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
 669static 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        rc = -ENOMEM;
 729        einj_param = einj_get_parameter_address();
 730        if ((param_extension || acpi5) && einj_param) {
 731                debugfs_create_x32("flags", S_IRUSR | S_IWUSR, einj_debug_dir,
 732                                   &error_flags);
 733                debugfs_create_x64("param1", S_IRUSR | S_IWUSR, einj_debug_dir,
 734                                   &error_param1);
 735                debugfs_create_x64("param2", S_IRUSR | S_IWUSR, einj_debug_dir,
 736                                   &error_param2);
 737                debugfs_create_x64("param3", S_IRUSR | S_IWUSR, einj_debug_dir,
 738                                   &error_param3);
 739                debugfs_create_x64("param4", S_IRUSR | S_IWUSR, einj_debug_dir,
 740                                   &error_param4);
 741                debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
 742                                   einj_debug_dir, &notrigger);
 743        }
 744
 745        if (vendor_dev[0]) {
 746                vendor_blob.data = vendor_dev;
 747                vendor_blob.size = strlen(vendor_dev);
 748                debugfs_create_blob("vendor", S_IRUSR, einj_debug_dir,
 749                                    &vendor_blob);
 750                debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
 751                                   einj_debug_dir, &vendor_flags);
 752        }
 753
 754        pr_info("Error INJection is initialized.\n");
 755
 756        return 0;
 757
 758err_release:
 759        apei_resources_release(&einj_resources);
 760err_fini:
 761        apei_resources_fini(&einj_resources);
 762        debugfs_remove_recursive(einj_debug_dir);
 763err_put_table:
 764        acpi_put_table((struct acpi_table_header *)einj_tab);
 765
 766        return rc;
 767}
 768
 769static void __exit einj_exit(void)
 770{
 771        struct apei_exec_context ctx;
 772
 773        if (einj_param) {
 774                acpi_size size = (acpi5) ?
 775                        sizeof(struct set_error_type_with_address) :
 776                        sizeof(struct einj_parameter);
 777
 778                acpi_os_unmap_iomem(einj_param, size);
 779        }
 780        einj_exec_ctx_init(&ctx);
 781        apei_exec_post_unmap_gars(&ctx);
 782        apei_resources_release(&einj_resources);
 783        apei_resources_fini(&einj_resources);
 784        debugfs_remove_recursive(einj_debug_dir);
 785        acpi_put_table((struct acpi_table_header *)einj_tab);
 786}
 787
 788module_init(einj_init);
 789module_exit(einj_exit);
 790
 791MODULE_AUTHOR("Huang Ying");
 792MODULE_DESCRIPTION("APEI Error INJection support");
 793MODULE_LICENSE("GPL");
 794