drivers/acpi/apei/ghes.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * APEI Generic Hardware Error Source support
   4  *
   5  * Generic Hardware Error Source provides a way to report platform
   6  * hardware errors (such as that from chipset). It works in so called
   7  * "Firmware First" mode, that is, hardware errors are reported to
   8  * firmware firstly, then reported to Linux by firmware. This way,
   9  * some non-standard hardware error registers or non-standard hardware
  10  * link can be checked by firmware to produce more hardware error
  11  * information for Linux.
  12  *
  13  * For more information about Generic Hardware Error Source, please
  14  * refer to ACPI Specification version 4.0, section 17.3.2.6
  15  *
  16  * Copyright 2010,2011 Intel Corp.
  17  *   Author: Huang Ying <ying.huang@intel.com>
  18  */
  19
  20 #include <linux/arm_sdei.h>
  21 #include <linux/kernel.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/init.h>
  24 #include <linux/acpi.h>
  25 #include <linux/io.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/timer.h>
  28 #include <linux/cper.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/mutex.h>
  31 #include <linux/ratelimit.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/irq_work.h>
  34 #include <linux/llist.h>
  35 #include <linux/genalloc.h>
  36 #include <linux/pci.h>
  37 #include <linux/pfn.h>
  38 #include <linux/aer.h>
  39 #include <linux/nmi.h>
  40 #include <linux/sched/clock.h>
  41 #include <linux/uuid.h>
  42 #include <linux/ras.h>
  43 #include <linux/task_work.h>
  44
  45 #include <acpi/actbl1.h>
  46 #include <acpi/ghes.h>
  47 #include <acpi/apei.h>
  48 #include <asm/fixmap.h>
  49 #include <asm/tlbflush.h>
  50 #include <ras/ras_event.h>
  51
  52 #include "apei-internal.h"
  53
  54 #define GHES_PFX        "GHES: "
  55
  56 #define GHES_ESTATUS_MAX_SIZE           65536
  57 #define GHES_ESOURCE_PREALLOC_MAX_SIZE  65536
  58
  59 #define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
  60
  61 /* This is just an estimation for memory pool allocation */
  62 #define GHES_ESTATUS_CACHE_AVG_SIZE     512
  63
  64 #define GHES_ESTATUS_CACHES_SIZE        4
  65
  66 #define GHES_ESTATUS_IN_CACHE_MAX_NSEC  10000000000ULL
  67 /* Prevent too many caches are allocated because of RCU */
  68 #define GHES_ESTATUS_CACHE_ALLOCED_MAX  (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
  69
  70 #define GHES_ESTATUS_CACHE_LEN(estatus_len)                     \
  71         (sizeof(struct ghes_estatus_cache) + (estatus_len))
  72 #define GHES_ESTATUS_FROM_CACHE(estatus_cache)                  \
  73         ((struct acpi_hest_generic_status *)                            \
  74          ((struct ghes_estatus_cache *)(estatus_cache) + 1))
  75
  76 #define GHES_ESTATUS_NODE_LEN(estatus_len)                      \
  77         (sizeof(struct ghes_estatus_node) + (estatus_len))
  78 #define GHES_ESTATUS_FROM_NODE(estatus_node)                    \
  79         ((struct acpi_hest_generic_status *)                            \
  80          ((struct ghes_estatus_node *)(estatus_node) + 1))
  81
  82 #define GHES_VENDOR_ENTRY_LEN(gdata_len)                               \
  83         (sizeof(struct ghes_vendor_record_entry) + (gdata_len))
  84 #define GHES_GDATA_FROM_VENDOR_ENTRY(vendor_entry)                     \
  85         ((struct acpi_hest_generic_data *)                              \
  86         ((struct ghes_vendor_record_entry *)(vendor_entry) + 1))
  87
  88 /*
  89  *  NMI-like notifications vary by architecture, before the compiler can prune
  90  *  unused static functions it needs a value for these enums.
  91  */
  92 #ifndef CONFIG_ARM_SDE_INTERFACE
  93 #define FIX_APEI_GHES_SDEI_NORMAL       __end_of_fixed_addresses
  94 #define FIX_APEI_GHES_SDEI_CRITICAL     __end_of_fixed_addresses
  95 #endif
  96
  97 static inline bool is_hest_type_generic_v2(struct ghes *ghes)
  98 {
  99         return ghes->generic->header.type == ACPI_HEST_TYPE_GENERIC_ERROR_V2;
 100 }
 101
 102 /*
 103  * This driver isn't really modular, however for the time being,
 104  * continuing to use module_param is the easiest way to remain
 105  * compatible with existing boot arg use cases.
 106  */
 107 bool ghes_disable;
 108 module_param_named(disable, ghes_disable, bool, 0);
 109
 110 /*
 111  * All error sources notified with HED (Hardware Error Device) share a
 112  * single notifier callback, so they need to be linked and checked one
 113  * by one. This holds true for NMI too.
 114  *
 115  * RCU is used for these lists, so ghes_list_mutex is only used for
 116  * list changing, not for traversing.
 117  */
 118 static LIST_HEAD(ghes_hed);
 119 static DEFINE_MUTEX(ghes_list_mutex);
 120
 121 /*
 122  * Because the memory area used to transfer hardware error information
 123  * from BIOS to Linux can be determined only in NMI, IRQ or timer
 124  * handler, but general ioremap can not be used in atomic context, so
 125  * the fixmap is used instead.
 126  *
 127  * This spinlock is used to prevent the fixmap entry from being used
 128  * simultaneously.
 129  */
 130 static DEFINE_SPINLOCK(ghes_notify_lock_irq);
 131
 132 struct ghes_vendor_record_entry {
 133         struct work_struct work;
 134         int error_severity;
 135         char vendor_record[];
 136 };
 137
 138 static struct gen_pool *ghes_estatus_pool;
 139 static unsigned long ghes_estatus_pool_size_request;
 140
 141 static struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
 142 static atomic_t ghes_estatus_cache_alloced;
 143
 144 static int ghes_panic_timeout __read_mostly = 30;
 145
 146 static void __iomem *ghes_map(u64 pfn, enum fixed_addresses fixmap_idx)
 147 {
 148         phys_addr_t paddr;
 149         pgprot_t prot;
 150
 151         paddr = PFN_PHYS(pfn);
 152         prot = arch_apei_get_mem_attribute(paddr);
 153         __set_fixmap(fixmap_idx, paddr, prot);
 154
 155         return (void __iomem *) __fix_to_virt(fixmap_idx);
 156 }
 157
 158 static void ghes_unmap(void __iomem *vaddr, enum fixed_addresses fixmap_idx)
 159 {
 160         int _idx = virt_to_fix((unsigned long)vaddr);
 161
 162         WARN_ON_ONCE(fixmap_idx != _idx);
 163         clear_fixmap(fixmap_idx);
 164 }
 165
 166 int ghes_estatus_pool_init(int num_ghes)
 167 {
 168         unsigned long addr, len;
 169         int rc;
 170
 171         ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
 172         if (!ghes_estatus_pool)
 173                 return -ENOMEM;
 174
 175         len = GHES_ESTATUS_CACHE_AVG_SIZE * GHES_ESTATUS_CACHE_ALLOCED_MAX;
 176         len += (num_ghes * GHES_ESOURCE_PREALLOC_MAX_SIZE);
 177
 178         ghes_estatus_pool_size_request = PAGE_ALIGN(len);
 179         addr = (unsigned long)vmalloc(PAGE_ALIGN(len));
 180         if (!addr)
 181                 goto err_pool_alloc;
 182
 183         rc = gen_pool_add(ghes_estatus_pool, addr, PAGE_ALIGN(len), -1);
 184         if (rc)
 185                 goto err_pool_add;
 186
 187         return 0;
 188
 189 err_pool_add:
 190         vfree((void *)addr);
 191
 192 err_pool_alloc:
 193         gen_pool_destroy(ghes_estatus_pool);
 194
 195         return -ENOMEM;
 196 }
 197
 198 static int map_gen_v2(struct ghes *ghes)
 199 {
 200         return apei_map_generic_address(&ghes->generic_v2->read_ack_register);
 201 }
 202
 203 static void unmap_gen_v2(struct ghes *ghes)
 204 {
 205         apei_unmap_generic_address(&ghes->generic_v2->read_ack_register);
 206 }
 207
 208 static void ghes_ack_error(struct acpi_hest_generic_v2 *gv2)
 209 {
 210         int rc;
 211         u64 val = 0;
 212
 213         rc = apei_read(&val, &gv2->read_ack_register);
 214         if (rc)
 215                 return;
 216
 217         val &= gv2->read_ack_preserve << gv2->read_ack_register.bit_offset;
 218         val |= gv2->read_ack_write    << gv2->read_ack_register.bit_offset;
 219
 220         apei_write(val, &gv2->read_ack_register);
 221 }
 222
 223 static struct ghes *ghes_new(struct acpi_hest_generic *generic)
 224 {
 225         struct ghes *ghes;
 226         unsigned int error_block_length;
 227         int rc;
 228
 229         ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
 230         if (!ghes)
 231                 return ERR_PTR(-ENOMEM);
 232
 233         ghes->generic = generic;
 234         if (is_hest_type_generic_v2(ghes)) {
 235                 rc = map_gen_v2(ghes);
 236                 if (rc)
 237                         goto err_free;
 238         }
 239
 240         rc = apei_map_generic_address(&generic->error_status_address);
 241         if (rc)
 242                 goto err_unmap_read_ack_addr;
 243         error_block_length = generic->error_block_length;
 244         if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
 245                 pr_warn(FW_WARN GHES_PFX
 246                         "Error status block length is too long: %u for "
 247                         "generic hardware error source: %d.\n",
 248                         error_block_length, generic->header.source_id);
 249                 error_block_length = GHES_ESTATUS_MAX_SIZE;
 250         }
 251         ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
 252         if (!ghes->estatus) {
 253                 rc = -ENOMEM;
 254                 goto err_unmap_status_addr;
 255         }
 256
 257         return ghes;
 258
 259 err_unmap_status_addr:
 260         apei_unmap_generic_address(&generic->error_status_address);
 261 err_unmap_read_ack_addr:
 262         if (is_hest_type_generic_v2(ghes))
 263                 unmap_gen_v2(ghes);
 264 err_free:
 265         kfree(ghes);
 266         return ERR_PTR(rc);
 267 }
 268
 269 static void ghes_fini(struct ghes *ghes)
 270 {
 271         kfree(ghes->estatus);
 272         apei_unmap_generic_address(&ghes->generic->error_status_address);
 273         if (is_hest_type_generic_v2(ghes))
 274                 unmap_gen_v2(ghes);
 275 }
 276
 277 static inline int ghes_severity(int severity)
 278 {
 279         switch (severity) {
 280         case CPER_SEV_INFORMATIONAL:
 281                 return GHES_SEV_NO;
 282         case CPER_SEV_CORRECTED:
 283                 return GHES_SEV_CORRECTED;
 284         case CPER_SEV_RECOVERABLE:
 285                 return GHES_SEV_RECOVERABLE;
 286         case CPER_SEV_FATAL:
 287                 return GHES_SEV_PANIC;
 288         default:
 289                 /* Unknown, go panic */
 290                 return GHES_SEV_PANIC;
 291         }
 292 }
 293
 294 static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
 295                                   int from_phys,
 296                                   enum fixed_addresses fixmap_idx)
 297 {
 298         void __iomem *vaddr;
 299         u64 offset;
 300         u32 trunk;
 301
 302         while (len > 0) {
 303                 offset = paddr - (paddr & PAGE_MASK);
 304                 vaddr = ghes_map(PHYS_PFN(paddr), fixmap_idx);
 305                 trunk = PAGE_SIZE - offset;
 306                 trunk = min(trunk, len);
 307                 if (from_phys)
 308                         memcpy_fromio(buffer, vaddr + offset, trunk);
 309                 else
 310                         memcpy_toio(vaddr + offset, buffer, trunk);
 311                 len -= trunk;
 312                 paddr += trunk;
 313                 buffer += trunk;
 314                 ghes_unmap(vaddr, fixmap_idx);
 315         }
 316 }
 317
 318 /* Check the top-level record header has an appropriate size. */
 319 static int __ghes_check_estatus(struct ghes *ghes,
 320                                 struct acpi_hest_generic_status *estatus)
 321 {
 322         u32 len = cper_estatus_len(estatus);
 323
 324         if (len < sizeof(*estatus)) {
 325                 pr_warn_ratelimited(FW_WARN GHES_PFX "Truncated error status block!\n");
 326                 return -EIO;
 327         }
 328
 329         if (len > ghes->generic->error_block_length) {
 330                 pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid error status block length!\n");
 331                 return -EIO;
 332         }
 333
 334         if (cper_estatus_check_header(estatus)) {
 335                 pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid CPER header!\n");
 336                 return -EIO;
 337         }
 338
 339         return 0;
 340 }
 341
 342 /* Read the CPER block, returning its address, and header in estatus. */
 343 static int __ghes_peek_estatus(struct ghes *ghes,
 344                                struct acpi_hest_generic_status *estatus,
 345                                u64 *buf_paddr, enum fixed_addresses fixmap_idx)
 346 {
 347         struct acpi_hest_generic *g = ghes->generic;
 348         int rc;
 349
 350         rc = apei_read(buf_paddr, &g->error_status_address);
 351         if (rc) {
 352                 *buf_paddr = 0;
 353                 pr_warn_ratelimited(FW_WARN GHES_PFX
 354 "Failed to read error status block address for hardware error source: %d.\n",
 355                                    g->header.source_id);
 356                 return -EIO;
 357         }
 358         if (!*buf_paddr)
 359                 return -ENOENT;
 360
 361         ghes_copy_tofrom_phys(estatus, *buf_paddr, sizeof(*estatus), 1,
 362                               fixmap_idx);
 363         if (!estatus->block_status) {
 364                 *buf_paddr = 0;
 365                 return -ENOENT;
 366         }
 367
 368         return 0;
 369 }
 370
 371 static int __ghes_read_estatus(struct acpi_hest_generic_status *estatus,
 372                                u64 buf_paddr, enum fixed_addresses fixmap_idx,
 373                                size_t buf_len)
 374 {
 375         ghes_copy_tofrom_phys(estatus, buf_paddr, buf_len, 1, fixmap_idx);
 376         if (cper_estatus_check(estatus)) {
 377                 pr_warn_ratelimited(FW_WARN GHES_PFX
 378                                     "Failed to read error status block!\n");
 379                 return -EIO;
 380         }
 381
 382         return 0;
 383 }
 384
 385 static int ghes_read_estatus(struct ghes *ghes,
 386                              struct acpi_hest_generic_status *estatus,
 387                              u64 *buf_paddr, enum fixed_addresses fixmap_idx)
 388 {
 389         int rc;
 390
 391         rc = __ghes_peek_estatus(ghes, estatus, buf_paddr, fixmap_idx);
 392         if (rc)
 393                 return rc;
 394
 395         rc = __ghes_check_estatus(ghes, estatus);
 396         if (rc)
 397                 return rc;
 398
 399         return __ghes_read_estatus(estatus, *buf_paddr, fixmap_idx,
 400                                    cper_estatus_len(estatus));
 401 }
 402
 403 static void ghes_clear_estatus(struct ghes *ghes,
 404                                struct acpi_hest_generic_status *estatus,
 405                                u64 buf_paddr, enum fixed_addresses fixmap_idx)
 406 {
 407         estatus->block_status = 0;
 408
 409         if (!buf_paddr)
 410                 return;
 411
 412         ghes_copy_tofrom_phys(estatus, buf_paddr,
 413                               sizeof(estatus->block_status), 0,
 414                               fixmap_idx);
 415
 416         /*
 417          * GHESv2 type HEST entries introduce support for error acknowledgment,
 418          * so only acknowledge the error if this support is present.
 419          */
 420         if (is_hest_type_generic_v2(ghes))
 421                 ghes_ack_error(ghes->generic_v2);
 422 }
 423
 424 /*
 425  * Called as task_work before returning to user-space.
 426  * Ensure any queued work has been done before we return to the context that
 427  * triggered the notification.
 428  */
 429 static void ghes_kick_task_work(struct callback_head *head)
 430 {
 431         struct acpi_hest_generic_status *estatus;
 432         struct ghes_estatus_node *estatus_node;
 433         u32 node_len;
 434
 435         estatus_node = container_of(head, struct ghes_estatus_node, task_work);
 436         if (IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))
 437                 memory_failure_queue_kick(estatus_node->task_work_cpu);
 438
 439         estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
 440         node_len = GHES_ESTATUS_NODE_LEN(cper_estatus_len(estatus));
 441         gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node, node_len);
 442 }
 443
 444 static bool ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata,
 445                                        int sev)
 446 {
 447         unsigned long pfn;
 448         int flags = -1;
 449         int sec_sev = ghes_severity(gdata->error_severity);
 450         struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
 451
 452         if (!IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))
 453                 return false;
 454
 455         if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
 456                 return false;
 457
 458         pfn = mem_err->physical_addr >> PAGE_SHIFT;
 459         if (!pfn_valid(pfn)) {
 460                 pr_warn_ratelimited(FW_WARN GHES_PFX
 461                 "Invalid address in generic error data: %#llx\n",
 462                 mem_err->physical_addr);
 463                 return false;
 464         }
 465
 466         /* iff following two events can be handled properly by now */
 467         if (sec_sev == GHES_SEV_CORRECTED &&
 468             (gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED))
 469                 flags = MF_SOFT_OFFLINE;
 470         if (sev == GHES_SEV_RECOVERABLE && sec_sev == GHES_SEV_RECOVERABLE)
 471                 flags = 0;
 472
 473         if (flags != -1) {
 474                 memory_failure_queue(pfn, flags);
 475                 return true;
 476         }
 477
 478         return false;
 479 }
 480
 481 /*
 482  * PCIe AER errors need to be sent to the AER driver for reporting and
 483  * recovery. The GHES severities map to the following AER severities and
 484  * require the following handling:
 485  *
 486  * GHES_SEV_CORRECTABLE -> AER_CORRECTABLE
 487  *     These need to be reported by the AER driver but no recovery is
 488  *     necessary.
 489  * GHES_SEV_RECOVERABLE -> AER_NONFATAL
 490  * GHES_SEV_RECOVERABLE && CPER_SEC_RESET -> AER_FATAL
 491  *     These both need to be reported and recovered from by the AER driver.
 492  * GHES_SEV_PANIC does not make it to this handling since the kernel must
 493  *     panic.
 494  */
 495 static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
 496 {
 497 #ifdef CONFIG_ACPI_APEI_PCIEAER
 498         struct cper_sec_pcie *pcie_err = acpi_hest_get_payload(gdata);
 499
 500         if (pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
 501             pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
 502                 unsigned int devfn;
 503                 int aer_severity;
 504
 505                 devfn = PCI_DEVFN(pcie_err->device_id.device,
 506                                   pcie_err->device_id.function);
 507                 aer_severity = cper_severity_to_aer(gdata->error_severity);
 508
 509                 /*
 510                  * If firmware reset the component to contain
 511                  * the error, we must reinitialize it before
 512                  * use, so treat it as a fatal AER error.
 513                  */
 514                 if (gdata->flags & CPER_SEC_RESET)
 515                         aer_severity = AER_FATAL;
 516
 517                 aer_recover_queue(pcie_err->device_id.segment,
 518                                   pcie_err->device_id.bus,
 519                                   devfn, aer_severity,
 520                                   (struct aer_capability_regs *)
 521                                   pcie_err->aer_info);
 522         }
 523 #endif
 524 }
 525
 526 static BLOCKING_NOTIFIER_HEAD(vendor_record_notify_list);
 527
 528 int ghes_register_vendor_record_notifier(struct notifier_block *nb)
 529 {
 530         return blocking_notifier_chain_register(&vendor_record_notify_list, nb);
 531 }
 532 EXPORT_SYMBOL_GPL(ghes_register_vendor_record_notifier);
 533
 534 void ghes_unregister_vendor_record_notifier(struct notifier_block *nb)
 535 {
 536         blocking_notifier_chain_unregister(&vendor_record_notify_list, nb);
 537 }
 538 EXPORT_SYMBOL_GPL(ghes_unregister_vendor_record_notifier);
 539
 540 static void ghes_vendor_record_work_func(struct work_struct *work)
 541 {
 542         struct ghes_vendor_record_entry *entry;
 543         struct acpi_hest_generic_data *gdata;
 544         u32 len;
 545
 546         entry = container_of(work, struct ghes_vendor_record_entry, work);
 547         gdata = GHES_GDATA_FROM_VENDOR_ENTRY(entry);
 548
 549         blocking_notifier_call_chain(&vendor_record_notify_list,
 550                                      entry->error_severity, gdata);
 551
 552         len = GHES_VENDOR_ENTRY_LEN(acpi_hest_get_record_size(gdata));
 553         gen_pool_free(ghes_estatus_pool, (unsigned long)entry, len);
 554 }
 555
 556 static void ghes_defer_non_standard_event(struct acpi_hest_generic_data *gdata,
 557                                           int sev)
 558 {
 559         struct acpi_hest_generic_data *copied_gdata;
 560         struct ghes_vendor_record_entry *entry;
 561         u32 len;
 562
 563         len = GHES_VENDOR_ENTRY_LEN(acpi_hest_get_record_size(gdata));
 564         entry = (void *)gen_pool_alloc(ghes_estatus_pool, len);
 565         if (!entry)
 566                 return;
 567
 568         copied_gdata = GHES_GDATA_FROM_VENDOR_ENTRY(entry);
 569         memcpy(copied_gdata, gdata, acpi_hest_get_record_size(gdata));
 570         entry->error_severity = sev;
 571
 572         INIT_WORK(&entry->work, ghes_vendor_record_work_func);
 573         schedule_work(&entry->work);
 574 }
 575
 576 static bool ghes_do_proc(struct ghes *ghes,
 577                          const struct acpi_hest_generic_status *estatus)
 578 {
 579         int sev, sec_sev;
 580         struct acpi_hest_generic_data *gdata;
 581         guid_t *sec_type;
 582         const guid_t *fru_id = &guid_null;
 583         char *fru_text = "";
 584         bool queued = false;
 585
 586         sev = ghes_severity(estatus->error_severity);
 587         apei_estatus_for_each_section(estatus, gdata) {
 588                 sec_type = (guid_t *)gdata->section_type;
 589                 sec_sev = ghes_severity(gdata->error_severity);
 590                 if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
 591                         fru_id = (guid_t *)gdata->fru_id;
 592
 593                 if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
 594                         fru_text = gdata->fru_text;
 595
 596                 if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
 597                         struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
 598
 599                         ghes_edac_report_mem_error(sev, mem_err);
 600
 601                         arch_apei_report_mem_error(sev, mem_err);
 602                         queued = ghes_handle_memory_failure(gdata, sev);
 603                 }
 604                 else if (guid_equal(sec_type, &CPER_SEC_PCIE)) {
 605                         ghes_handle_aer(gdata);
 606                 }
 607                 else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) {
 608                         struct cper_sec_proc_arm *err = acpi_hest_get_payload(gdata);
 609
 610                         log_arm_hw_error(err);
 611                 } else {
 612                         void *err = acpi_hest_get_payload(gdata);
 613
 614                         ghes_defer_non_standard_event(gdata, sev);
 615                         log_non_standard_event(sec_type, fru_id, fru_text,
 616                                                sec_sev, err,
 617                                                gdata->error_data_length);
 618                 }
 619         }
 620
 621         return queued;
 622 }
 623
 624 static void __ghes_print_estatus(const char *pfx,
 625                                  const struct acpi_hest_generic *generic,
 626                                  const struct acpi_hest_generic_status *estatus)
 627 {
 628         static atomic_t seqno;
 629         unsigned int curr_seqno;
 630         char pfx_seq[64];
 631
 632         if (pfx == NULL) {
 633                 if (ghes_severity(estatus->error_severity) <=
 634                     GHES_SEV_CORRECTED)
 635                         pfx = KERN_WARNING;
 636                 else
 637                         pfx = KERN_ERR;
 638         }
 639         curr_seqno = atomic_inc_return(&seqno);
 640         snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
 641         printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
 642                pfx_seq, generic->header.source_id);
 643         cper_estatus_print(pfx_seq, estatus);
 644 }
 645
 646 static int ghes_print_estatus(const char *pfx,
 647                               const struct acpi_hest_generic *generic,
 648                               const struct acpi_hest_generic_status *estatus)
 649 {
 650         /* Not more than 2 messages every 5 seconds */
 651         static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
 652         static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
 653         struct ratelimit_state *ratelimit;
 654
 655         if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED)
 656                 ratelimit = &ratelimit_corrected;
 657         else
 658                 ratelimit = &ratelimit_uncorrected;
 659         if (__ratelimit(ratelimit)) {
 660                 __ghes_print_estatus(pfx, generic, estatus);
 661                 return 1;
 662         }
 663         return 0;
 664 }
 665
 666 /*
 667  * GHES error status reporting throttle, to report more kinds of
 668  * errors, instead of just most frequently occurred errors.
 669  */
 670 static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
 671 {
 672         u32 len;
 673         int i, cached = 0;
 674         unsigned long long now;
 675         struct ghes_estatus_cache *cache;
 676         struct acpi_hest_generic_status *cache_estatus;
 677
 678         len = cper_estatus_len(estatus);
 679         rcu_read_lock();
 680         for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
 681                 cache = rcu_dereference(ghes_estatus_caches[i]);
 682                 if (cache == NULL)
 683                         continue;
 684                 if (len != cache->estatus_len)
 685                         continue;
 686                 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
 687                 if (memcmp(estatus, cache_estatus, len))
 688                         continue;
 689                 atomic_inc(&cache->count);
 690                 now = sched_clock();
 691                 if (now - cache->time_in < GHES_ESTATUS_IN_CACHE_MAX_NSEC)
 692                         cached = 1;
 693                 break;
 694         }
 695         rcu_read_unlock();
 696         return cached;
 697 }
 698
 699 static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
 700         struct acpi_hest_generic *generic,
 701         struct acpi_hest_generic_status *estatus)
 702 {
 703         int alloced;
 704         u32 len, cache_len;
 705         struct ghes_estatus_cache *cache;
 706         struct acpi_hest_generic_status *cache_estatus;
 707
 708         alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
 709         if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
 710                 atomic_dec(&ghes_estatus_cache_alloced);
 711                 return NULL;
 712         }
 713         len = cper_estatus_len(estatus);
 714         cache_len = GHES_ESTATUS_CACHE_LEN(len);
 715         cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
 716         if (!cache) {
 717                 atomic_dec(&ghes_estatus_cache_alloced);
 718                 return NULL;
 719         }
 720         cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
 721         memcpy(cache_estatus, estatus, len);
 722         cache->estatus_len = len;
 723         atomic_set(&cache->count, 0);
 724         cache->generic = generic;
 725         cache->time_in = sched_clock();
 726         return cache;
 727 }
 728
 729 static void ghes_estatus_cache_free(struct ghes_estatus_cache *cache)
 730 {
 731         u32 len;
 732
 733         len = cper_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
 734         len = GHES_ESTATUS_CACHE_LEN(len);
 735         gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
 736         atomic_dec(&ghes_estatus_cache_alloced);
 737 }
 738
 739 static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
 740 {
 741         struct ghes_estatus_cache *cache;
 742
 743         cache = container_of(head, struct ghes_estatus_cache, rcu);
 744         ghes_estatus_cache_free(cache);
 745 }
 746
 747 static void ghes_estatus_cache_add(
 748         struct acpi_hest_generic *generic,
 749         struct acpi_hest_generic_status *estatus)
 750 {
 751         int i, slot = -1, count;
 752         unsigned long long now, duration, period, max_period = 0;
 753         struct ghes_estatus_cache *cache, *slot_cache = NULL, *new_cache;
 754
 755         new_cache = ghes_estatus_cache_alloc(generic, estatus);
 756         if (new_cache == NULL)
 757                 return;
 758         rcu_read_lock();
 759         now = sched_clock();
 760         for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
 761                 cache = rcu_dereference(ghes_estatus_caches[i]);
 762                 if (cache == NULL) {
 763                         slot = i;
 764                         slot_cache = NULL;
 765                         break;
 766                 }
 767                 duration = now - cache->time_in;
 768                 if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
 769                         slot = i;
 770                         slot_cache = cache;
 771                         break;
 772                 }
 773                 count = atomic_read(&cache->count);
 774                 period = duration;
 775                 do_div(period, (count + 1));
 776                 if (period > max_period) {
 777                         max_period = period;
 778                         slot = i;
 779                         slot_cache = cache;
 780                 }
 781         }
 782         /* new_cache must be put into array after its contents are written */
 783         smp_wmb();
 784         if (slot != -1 && cmpxchg(ghes_estatus_caches + slot,
 785                                   slot_cache, new_cache) == slot_cache) {
 786                 if (slot_cache)
 787                         call_rcu(&slot_cache->rcu, ghes_estatus_cache_rcu_free);
 788         } else
 789                 ghes_estatus_cache_free(new_cache);
 790         rcu_read_unlock();
 791 }
 792
 793 static void __ghes_panic(struct ghes *ghes,
 794                          struct acpi_hest_generic_status *estatus,
 795                          u64 buf_paddr, enum fixed_addresses fixmap_idx)
 796 {
 797         __ghes_print_estatus(KERN_EMERG, ghes->generic, estatus);
 798
 799         ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx);
 800
 801         /* reboot to log the error! */
 802         if (!panic_timeout)
 803                 panic_timeout = ghes_panic_timeout;
 804         panic("Fatal hardware error!");
 805 }
 806
 807 static int ghes_proc(struct ghes *ghes)
 808 {
 809         struct acpi_hest_generic_status *estatus = ghes->estatus;
 810         u64 buf_paddr;
 811         int rc;
 812
 813         rc = ghes_read_estatus(ghes, estatus, &buf_paddr, FIX_APEI_GHES_IRQ);
 814         if (rc)
 815                 goto out;
 816
 817         if (ghes_severity(estatus->error_severity) >= GHES_SEV_PANIC)
 818                 __ghes_panic(ghes, estatus, buf_paddr, FIX_APEI_GHES_IRQ);
 819
 820         if (!ghes_estatus_cached(estatus)) {
 821                 if (ghes_print_estatus(NULL, ghes->generic, estatus))
 822                         ghes_estatus_cache_add(ghes->generic, estatus);
 823         }
 824         ghes_do_proc(ghes, estatus);
 825
 826 out:
 827         ghes_clear_estatus(ghes, estatus, buf_paddr, FIX_APEI_GHES_IRQ);
 828
 829         return rc;
 830 }
 831
 832 static void ghes_add_timer(struct ghes *ghes)
 833 {
 834         struct acpi_hest_generic *g = ghes->generic;
 835         unsigned long expire;
 836
 837         if (!g->notify.poll_interval) {
 838                 pr_warn(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n",
 839                         g->header.source_id);
 840                 return;
 841         }
 842         expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
 843         ghes->timer.expires = round_jiffies_relative(expire);
 844         add_timer(&ghes->timer);
 845 }
 846
 847 static void ghes_poll_func(struct timer_list *t)
 848 {
 849         struct ghes *ghes = from_timer(ghes, t, timer);
 850         unsigned long flags;
 851
 852         spin_lock_irqsave(&ghes_notify_lock_irq, flags);
 853         ghes_proc(ghes);
 854         spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
 855         if (!(ghes->flags & GHES_EXITING))
 856                 ghes_add_timer(ghes);
 857 }
 858
 859 static irqreturn_t ghes_irq_func(int irq, void *data)
 860 {
 861         struct ghes *ghes = data;
 862         unsigned long flags;
 863         int rc;
 864
 865         spin_lock_irqsave(&ghes_notify_lock_irq, flags);
 866         rc = ghes_proc(ghes);
 867         spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
 868         if (rc)
 869                 return IRQ_NONE;
 870
 871         return IRQ_HANDLED;
 872 }
 873
 874 static int ghes_notify_hed(struct notifier_block *this, unsigned long event,
 875                            void *data)
 876 {
 877         struct ghes *ghes;
 878         unsigned long flags;
 879         int ret = NOTIFY_DONE;
 880
 881         spin_lock_irqsave(&ghes_notify_lock_irq, flags);
 882         rcu_read_lock();
 883         list_for_each_entry_rcu(ghes, &ghes_hed, list) {
 884                 if (!ghes_proc(ghes))
 885                         ret = NOTIFY_OK;
 886         }
 887         rcu_read_unlock();
 888         spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
 889
 890         return ret;
 891 }
 892
 893 static struct notifier_block ghes_notifier_hed = {
 894         .notifier_call = ghes_notify_hed,
 895 };
 896
 897 /*
 898  * Handlers for CPER records may not be NMI safe. For example,
 899  * memory_failure_queue() takes spinlocks and calls schedule_work_on().
 900  * In any NMI-like handler, memory from ghes_estatus_pool is used to save
 901  * estatus, and added to the ghes_estatus_llist. irq_work_queue() causes
 902  * ghes_proc_in_irq() to run in IRQ context where each estatus in
 903  * ghes_estatus_llist is processed.
 904  *
 905  * Memory from the ghes_estatus_pool is also used with the ghes_estatus_cache
 906  * to suppress frequent messages.
 907  */
 908 static struct llist_head ghes_estatus_llist;
 909 static struct irq_work ghes_proc_irq_work;
 910
 911 static void ghes_proc_in_irq(struct irq_work *irq_work)
 912 {
 913         struct llist_node *llnode, *next;
 914         struct ghes_estatus_node *estatus_node;
 915         struct acpi_hest_generic *generic;
 916         struct acpi_hest_generic_status *estatus;
 917         bool task_work_pending;
 918         u32 len, node_len;
 919         int ret;
 920
 921         llnode = llist_del_all(&ghes_estatus_llist);
 922         /*
 923          * Because the time order of estatus in list is reversed,
 924          * revert it back to proper order.
 925          */
 926         llnode = llist_reverse_order(llnode);
 927         while (llnode) {
 928                 next = llnode->next;
 929                 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
 930                                            llnode);
 931                 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
 932                 len = cper_estatus_len(estatus);
 933                 node_len = GHES_ESTATUS_NODE_LEN(len);
 934                 task_work_pending = ghes_do_proc(estatus_node->ghes, estatus);
 935                 if (!ghes_estatus_cached(estatus)) {
 936                         generic = estatus_node->generic;
 937                         if (ghes_print_estatus(NULL, generic, estatus))
 938                                 ghes_estatus_cache_add(generic, estatus);
 939                 }
 940
 941                 if (task_work_pending && current->mm != &init_mm) {
 942                         estatus_node->task_work.func = ghes_kick_task_work;
 943                         estatus_node->task_work_cpu = smp_processor_id();
 944                         ret = task_work_add(current, &estatus_node->task_work,
 945                                             TWA_RESUME);
 946                         if (ret)
 947                                 estatus_node->task_work.func = NULL;
 948                 }
 949
 950                 if (!estatus_node->task_work.func)
 951                         gen_pool_free(ghes_estatus_pool,
 952                                       (unsigned long)estatus_node, node_len);
 953
 954                 llnode = next;
 955         }
 956 }
 957
 958 static void ghes_print_queued_estatus(void)
 959 {
 960         struct llist_node *llnode;
 961         struct ghes_estatus_node *estatus_node;
 962         struct acpi_hest_generic *generic;
 963         struct acpi_hest_generic_status *estatus;
 964
 965         llnode = llist_del_all(&ghes_estatus_llist);
 966         /*
 967          * Because the time order of estatus in list is reversed,
 968          * revert it back to proper order.
 969          */
 970         llnode = llist_reverse_order(llnode);
 971         while (llnode) {
 972                 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
 973                                            llnode);
 974                 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
 975                 generic = estatus_node->generic;
 976                 ghes_print_estatus(NULL, generic, estatus);
 977                 llnode = llnode->next;
 978         }
 979 }
 980
 981 static int ghes_in_nmi_queue_one_entry(struct ghes *ghes,
 982                                        enum fixed_addresses fixmap_idx)
 983 {
 984         struct acpi_hest_generic_status *estatus, tmp_header;
 985         struct ghes_estatus_node *estatus_node;
 986         u32 len, node_len;
 987         u64 buf_paddr;
 988         int sev, rc;
 989
 990         if (!IS_ENABLED(CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG))
 991                 return -EOPNOTSUPP;
 992
 993         rc = __ghes_peek_estatus(ghes, &tmp_header, &buf_paddr, fixmap_idx);
 994         if (rc) {
 995                 ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
 996                 return rc;
 997         }
 998
 999         rc = __ghes_check_estatus(ghes, &tmp_header);
1000         if (rc) {
1001                 ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
1002                 return rc;
1003         }
1004
1005         len = cper_estatus_len(&tmp_header);
1006         node_len = GHES_ESTATUS_NODE_LEN(len);
1007         estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool, node_len);
1008         if (!estatus_node)
1009                 return -ENOMEM;
1010
1011         estatus_node->ghes = ghes;
1012         estatus_node->generic = ghes->generic;
1013         estatus_node->task_work.func = NULL;
1014         estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
1015
1016         if (__ghes_read_estatus(estatus, buf_paddr, fixmap_idx, len)) {
1017                 ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx);
1018                 rc = -ENOENT;
1019                 goto no_work;
1020         }
1021
1022         sev = ghes_severity(estatus->error_severity);
1023         if (sev >= GHES_SEV_PANIC) {
1024                 ghes_print_queued_estatus();
1025                 __ghes_panic(ghes, estatus, buf_paddr, fixmap_idx);
1026         }
1027
1028         ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
1029
1030         /* This error has been reported before, don't process it again. */
1031         if (ghes_estatus_cached(estatus))
1032                 goto no_work;
1033
1034         llist_add(&estatus_node->llnode, &ghes_estatus_llist);
1035
1036         return rc;
1037
1038 no_work:
1039         gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
1040                       node_len);
1041
1042         return rc;
1043 }
1044
1045 static int ghes_in_nmi_spool_from_list(struct list_head *rcu_list,
1046                                        enum fixed_addresses fixmap_idx)
1047 {
1048         int ret = -ENOENT;
1049         struct ghes *ghes;
1050
1051         rcu_read_lock();
1052         list_for_each_entry_rcu(ghes, rcu_list, list) {
1053                 if (!ghes_in_nmi_queue_one_entry(ghes, fixmap_idx))
1054                         ret = 0;
1055         }
1056         rcu_read_unlock();
1057
1058         if (IS_ENABLED(CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG) && !ret)
1059                 irq_work_queue(&ghes_proc_irq_work);
1060
1061         return ret;
1062 }
1063
1064 #ifdef CONFIG_ACPI_APEI_SEA
1065 static LIST_HEAD(ghes_sea);
1066
1067 /*
1068  * Return 0 only if one of the SEA error sources successfully reported an error
1069  * record sent from the firmware.
1070  */
1071 int ghes_notify_sea(void)
1072 {
1073         static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sea);
1074         int rv;
1075
1076         raw_spin_lock(&ghes_notify_lock_sea);
1077         rv = ghes_in_nmi_spool_from_list(&ghes_sea, FIX_APEI_GHES_SEA);
1078         raw_spin_unlock(&ghes_notify_lock_sea);
1079
1080         return rv;
1081 }
1082
1083 static void ghes_sea_add(struct ghes *ghes)
1084 {
1085         mutex_lock(&ghes_list_mutex);
1086         list_add_rcu(&ghes->list, &ghes_sea);
1087         mutex_unlock(&ghes_list_mutex);
1088 }
1089
1090 static void ghes_sea_remove(struct ghes *ghes)
1091 {
1092         mutex_lock(&ghes_list_mutex);
1093         list_del_rcu(&ghes->list);
1094         mutex_unlock(&ghes_list_mutex);
1095         synchronize_rcu();
1096 }
1097 #else /* CONFIG_ACPI_APEI_SEA */
1098 static inline void ghes_sea_add(struct ghes *ghes) { }
1099 static inline void ghes_sea_remove(struct ghes *ghes) { }
1100 #endif /* CONFIG_ACPI_APEI_SEA */
1101
1102 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
1103 /*
1104  * NMI may be triggered on any CPU, so ghes_in_nmi is used for
1105  * having only one concurrent reader.
1106  */
1107 static atomic_t ghes_in_nmi = ATOMIC_INIT(0);
1108
1109 static LIST_HEAD(ghes_nmi);
1110
1111 static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
1112 {
1113         static DEFINE_RAW_SPINLOCK(ghes_notify_lock_nmi);
1114         int ret = NMI_DONE;
1115
1116         if (!atomic_add_unless(&ghes_in_nmi, 1, 1))
1117                 return ret;
1118
1119         raw_spin_lock(&ghes_notify_lock_nmi);
1120         if (!ghes_in_nmi_spool_from_list(&ghes_nmi, FIX_APEI_GHES_NMI))
1121                 ret = NMI_HANDLED;
1122         raw_spin_unlock(&ghes_notify_lock_nmi);
1123
1124         atomic_dec(&ghes_in_nmi);
1125         return ret;
1126 }
1127
1128 static void ghes_nmi_add(struct ghes *ghes)
1129 {
1130         mutex_lock(&ghes_list_mutex);
1131         if (list_empty(&ghes_nmi))
1132                 register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0, "ghes");
1133         list_add_rcu(&ghes->list, &ghes_nmi);
1134         mutex_unlock(&ghes_list_mutex);
1135 }
1136
1137 static void ghes_nmi_remove(struct ghes *ghes)
1138 {
1139         mutex_lock(&ghes_list_mutex);
1140         list_del_rcu(&ghes->list);
1141         if (list_empty(&ghes_nmi))
1142                 unregister_nmi_handler(NMI_LOCAL, "ghes");
1143         mutex_unlock(&ghes_list_mutex);
1144         /*
1145          * To synchronize with NMI handler, ghes can only be
1146          * freed after NMI handler finishes.
1147          */
1148         synchronize_rcu();
1149 }
1150 #else /* CONFIG_HAVE_ACPI_APEI_NMI */
1151 static inline void ghes_nmi_add(struct ghes *ghes) { }
1152 static inline void ghes_nmi_remove(struct ghes *ghes) { }
1153 #endif /* CONFIG_HAVE_ACPI_APEI_NMI */
1154
1155 static void ghes_nmi_init_cxt(void)
1156 {
1157         init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
1158 }
1159
1160 static int __ghes_sdei_callback(struct ghes *ghes,
1161                                 enum fixed_addresses fixmap_idx)
1162 {
1163         if (!ghes_in_nmi_queue_one_entry(ghes, fixmap_idx)) {
1164                 irq_work_queue(&ghes_proc_irq_work);
1165
1166                 return 0;
1167         }
1168
1169         return -ENOENT;
1170 }
1171
1172 static int ghes_sdei_normal_callback(u32 event_num, struct pt_regs *regs,
1173                                       void *arg)
1174 {
1175         static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sdei_normal);
1176         struct ghes *ghes = arg;
1177         int err;
1178
1179         raw_spin_lock(&ghes_notify_lock_sdei_normal);
1180         err = __ghes_sdei_callback(ghes, FIX_APEI_GHES_SDEI_NORMAL);
1181         raw_spin_unlock(&ghes_notify_lock_sdei_normal);
1182
1183         return err;
1184 }
1185
1186 static int ghes_sdei_critical_callback(u32 event_num, struct pt_regs *regs,
1187                                        void *arg)
1188 {
1189         static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sdei_critical);
1190         struct ghes *ghes = arg;
1191         int err;
1192
1193         raw_spin_lock(&ghes_notify_lock_sdei_critical);
1194         err = __ghes_sdei_callback(ghes, FIX_APEI_GHES_SDEI_CRITICAL);
1195         raw_spin_unlock(&ghes_notify_lock_sdei_critical);
1196
1197         return err;
1198 }
1199
1200 static int apei_sdei_register_ghes(struct ghes *ghes)
1201 {
1202         if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
1203                 return -EOPNOTSUPP;
1204
1205         return sdei_register_ghes(ghes, ghes_sdei_normal_callback,
1206                                  ghes_sdei_critical_callback);
1207 }
1208
1209 static int apei_sdei_unregister_ghes(struct ghes *ghes)
1210 {
1211         if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
1212                 return -EOPNOTSUPP;
1213
1214         return sdei_unregister_ghes(ghes);
1215 }
1216
1217 static int ghes_probe(struct platform_device *ghes_dev)
1218 {
1219         struct acpi_hest_generic *generic;
1220         struct ghes *ghes = NULL;
1221         unsigned long flags;
1222
1223         int rc = -EINVAL;
1224
1225         generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
1226         if (!generic->enabled)
1227                 return -ENODEV;
1228
1229         switch (generic->notify.type) {
1230         case ACPI_HEST_NOTIFY_POLLED:
1231         case ACPI_HEST_NOTIFY_EXTERNAL:
1232         case ACPI_HEST_NOTIFY_SCI:
1233         case ACPI_HEST_NOTIFY_GSIV:
1234         case ACPI_HEST_NOTIFY_GPIO:
1235                 break;
1236
1237         case ACPI_HEST_NOTIFY_SEA:
1238                 if (!IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
1239                         pr_warn(GHES_PFX "Generic hardware error source: %d notified via SEA is not supported\n",
1240                                 generic->header.source_id);
1241                         rc = -ENOTSUPP;
1242                         goto err;
1243                 }
1244                 break;
1245         case ACPI_HEST_NOTIFY_NMI:
1246                 if (!IS_ENABLED(CONFIG_HAVE_ACPI_APEI_NMI)) {
1247                         pr_warn(GHES_PFX "Generic hardware error source: %d notified via NMI interrupt is not supported!\n",
1248                                 generic->header.source_id);
1249                         goto err;
1250                 }
1251                 break;
1252         case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
1253                 if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE)) {
1254                         pr_warn(GHES_PFX "Generic hardware error source: %d notified via SDE Interface is not supported!\n",
1255                                 generic->header.source_id);
1256                         goto err;
1257                 }
1258                 break;
1259         case ACPI_HEST_NOTIFY_LOCAL:
1260                 pr_warn(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
1261                         generic->header.source_id);
1262                 goto err;
1263         default:
1264                 pr_warn(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
1265                         generic->notify.type, generic->header.source_id);
1266                 goto err;
1267         }
1268
1269         rc = -EIO;
1270         if (generic->error_block_length <
1271             sizeof(struct acpi_hest_generic_status)) {
1272                 pr_warn(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
1273                         generic->error_block_length, generic->header.source_id);
1274                 goto err;
1275         }
1276         ghes = ghes_new(generic);
1277         if (IS_ERR(ghes)) {
1278                 rc = PTR_ERR(ghes);
1279                 ghes = NULL;
1280                 goto err;
1281         }
1282
1283         switch (generic->notify.type) {
1284         case ACPI_HEST_NOTIFY_POLLED:
1285                 timer_setup(&ghes->timer, ghes_poll_func, 0);
1286                 ghes_add_timer(ghes);
1287                 break;
1288         case ACPI_HEST_NOTIFY_EXTERNAL:
1289                 /* External interrupt vector is GSI */
1290                 rc = acpi_gsi_to_irq(generic->notify.vector, &ghes->irq);
1291                 if (rc) {
1292                         pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
1293                                generic->header.source_id);
1294                         goto err;
1295                 }
1296                 rc = request_irq(ghes->irq, ghes_irq_func, IRQF_SHARED,
1297                                  "GHES IRQ", ghes);
1298                 if (rc) {
1299                         pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
1300                                generic->header.source_id);
1301                         goto err;
1302                 }
1303                 break;
1304
1305         case ACPI_HEST_NOTIFY_SCI:
1306         case ACPI_HEST_NOTIFY_GSIV:
1307         case ACPI_HEST_NOTIFY_GPIO:
1308                 mutex_lock(&ghes_list_mutex);
1309                 if (list_empty(&ghes_hed))
1310                         register_acpi_hed_notifier(&ghes_notifier_hed);
1311                 list_add_rcu(&ghes->list, &ghes_hed);
1312                 mutex_unlock(&ghes_list_mutex);
1313                 break;
1314
1315         case ACPI_HEST_NOTIFY_SEA:
1316                 ghes_sea_add(ghes);
1317                 break;
1318         case ACPI_HEST_NOTIFY_NMI:
1319                 ghes_nmi_add(ghes);
1320                 break;
1321         case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
1322                 rc = apei_sdei_register_ghes(ghes);
1323                 if (rc)
1324                         goto err;
1325                 break;
1326         default:
1327                 BUG();
1328         }
1329
1330         platform_set_drvdata(ghes_dev, ghes);
1331
1332         ghes_edac_register(ghes, &ghes_dev->dev);
1333
1334         /* Handle any pending errors right away */
1335         spin_lock_irqsave(&ghes_notify_lock_irq, flags);
1336         ghes_proc(ghes);
1337         spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
1338
1339         return 0;
1340
1341 err:
1342         if (ghes) {
1343                 ghes_fini(ghes);
1344                 kfree(ghes);
1345         }
1346         return rc;
1347 }
1348
1349 static int ghes_remove(struct platform_device *ghes_dev)
1350 {
1351         int rc;
1352         struct ghes *ghes;
1353         struct acpi_hest_generic *generic;
1354
1355         ghes = platform_get_drvdata(ghes_dev);
1356         generic = ghes->generic;
1357
1358         ghes->flags |= GHES_EXITING;
1359         switch (generic->notify.type) {
1360         case ACPI_HEST_NOTIFY_POLLED:
1361                 del_timer_sync(&ghes->timer);
1362                 break;
1363         case ACPI_HEST_NOTIFY_EXTERNAL:
1364                 free_irq(ghes->irq, ghes);
1365                 break;
1366
1367         case ACPI_HEST_NOTIFY_SCI:
1368         case ACPI_HEST_NOTIFY_GSIV:
1369         case ACPI_HEST_NOTIFY_GPIO:
1370                 mutex_lock(&ghes_list_mutex);
1371                 list_del_rcu(&ghes->list);
1372                 if (list_empty(&ghes_hed))
1373                         unregister_acpi_hed_notifier(&ghes_notifier_hed);
1374                 mutex_unlock(&ghes_list_mutex);
1375                 synchronize_rcu();
1376                 break;
1377
1378         case ACPI_HEST_NOTIFY_SEA:
1379                 ghes_sea_remove(ghes);
1380                 break;
1381         case ACPI_HEST_NOTIFY_NMI:
1382                 ghes_nmi_remove(ghes);
1383                 break;
1384         case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
1385                 rc = apei_sdei_unregister_ghes(ghes);
1386                 if (rc)
1387                         return rc;
1388                 break;
1389         default:
1390                 BUG();
1391                 break;
1392         }
1393
1394         ghes_fini(ghes);
1395
1396         ghes_edac_unregister(ghes);
1397
1398         kfree(ghes);
1399
1400         platform_set_drvdata(ghes_dev, NULL);
1401
1402         return 0;
1403 }
1404
1405 static struct platform_driver ghes_platform_driver = {
1406         .driver         = {
1407                 .name   = "GHES",
1408         },
1409         .probe          = ghes_probe,
1410         .remove         = ghes_remove,
1411 };
1412
1413 static int __init ghes_init(void)
1414 {
1415         int rc;
1416
1417         if (acpi_disabled)
1418                 return -ENODEV;
1419
1420         switch (hest_disable) {
1421         case HEST_NOT_FOUND:
1422                 return -ENODEV;
1423         case HEST_DISABLED:
1424                 pr_info(GHES_PFX "HEST is not enabled!\n");
1425                 return -EINVAL;
1426         default:
1427                 break;
1428         }
1429
1430         if (ghes_disable) {
1431                 pr_info(GHES_PFX "GHES is not enabled!\n");
1432                 return -EINVAL;
1433         }
1434
1435         ghes_nmi_init_cxt();
1436
1437         rc = platform_driver_register(&ghes_platform_driver);
1438         if (rc)
1439                 goto err;
1440
1441         rc = apei_osc_setup();
1442         if (rc == 0 && osc_sb_apei_support_acked)
1443                 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1444         else if (rc == 0 && !osc_sb_apei_support_acked)
1445                 pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
1446         else if (rc && osc_sb_apei_support_acked)
1447                 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
1448         else
1449                 pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
1450
1451         return 0;
1452 err:
1453         return rc;
1454 }
1455 device_initcall(ghes_init);