// SPDX-License-Identifier: GPL-2.0-or-later /* * FRU (Field-Replaceable Unit) Memory Poison Manager * * Copyright (c) 2024, Advanced Micro Devices, Inc. * All Rights Reserved. * * Authors: * Naveen Krishna Chatradhi * Muralidhara M K * Yazen Ghannam * * Implementation notes, assumptions, and limitations: * * - FRU memory poison section and memory poison descriptor definitions are not yet * included in the UEFI specification. So they are defined here. Afterwards, they * may be moved to linux/cper.h, if appropriate. * * - Platforms based on AMD MI300 systems will be the first to use these structures. * There are a number of assumptions made here that will need to be generalized * to support other platforms. * * AMD MI300-based platform(s) assumptions: * - Memory errors are reported through x86 MCA. * - The entire DRAM row containing a memory error should be retired. * - There will be (1) FRU memory poison section per CPER. * - The FRU will be the CPU package (processor socket). * - The default number of memory poison descriptor entries should be (8). * - The platform will use ACPI ERST for persistent storage. * - All FRU records should be saved to persistent storage. Module init will * fail if any FRU record is not successfully written. * * - Boot time memory retirement may occur later than ideal due to dependencies * on other libraries and drivers. This leaves a gap where bad memory may be * accessed during early boot stages. * * - Enough memory should be pre-allocated for each FRU record to be able to hold * the expected number of descriptor entries. This, mostly empty, record is * written to storage during init time. Subsequent writes to the same record * should allow the Platform to update the stored record in-place. Otherwise, * if the record is extended, then the Platform may need to perform costly memory * management operations on the storage. For example, the Platform may spend time * in Firmware copying and invalidating memory on a relatively slow SPI ROM. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include "../debugfs.h" #include "atl/internal.h" #define INVALID_CPU UINT_MAX /* Validation Bits */ #define FMP_VALID_ARCH_TYPE BIT_ULL(0) #define FMP_VALID_ARCH BIT_ULL(1) #define FMP_VALID_ID_TYPE BIT_ULL(2) #define FMP_VALID_ID BIT_ULL(3) #define FMP_VALID_LIST_ENTRIES BIT_ULL(4) #define FMP_VALID_LIST BIT_ULL(5) /* FRU Architecture Types */ #define FMP_ARCH_TYPE_X86_CPUID_1_EAX 0 /* FRU ID Types */ #define FMP_ID_TYPE_X86_PPIN 0 /* FRU Memory Poison Section */ struct cper_sec_fru_mem_poison { u32 checksum; u64 validation_bits; u32 fru_arch_type; u64 fru_arch; u32 fru_id_type; u64 fru_id; u32 nr_entries; } __packed; /* FRU Descriptor ID Types */ #define FPD_HW_ID_TYPE_MCA_IPID 0 /* FRU Descriptor Address Types */ #define FPD_ADDR_TYPE_MCA_ADDR 0 /* Memory Poison Descriptor */ struct cper_fru_poison_desc { u64 timestamp; u32 hw_id_type; u64 hw_id; u32 addr_type; u64 addr; } __packed; /* Collection of headers and sections for easy pointer use. */ struct fru_rec { struct cper_record_header hdr; struct cper_section_descriptor sec_desc; struct cper_sec_fru_mem_poison fmp; struct cper_fru_poison_desc entries[]; } __packed; /* * Pointers to the complete CPER record of each FRU. * * Memory allocation will include padded space for descriptor entries. */ static struct fru_rec **fru_records; /* system physical addresses array */ static u64 *spa_entries; static struct dentry *fmpm_dfs_dir; static struct dentry *fmpm_dfs_entries; #define CPER_CREATOR_FMP \ GUID_INIT(0xcd5c2993, 0xf4b2, 0x41b2, 0xb5, 0xd4, 0xf9, 0xc3, \ 0xa0, 0x33, 0x08, 0x75) #define CPER_SECTION_TYPE_FMP \ GUID_INIT(0x5e4706c1, 0x5356, 0x48c6, 0x93, 0x0b, 0x52, 0xf2, \ 0x12, 0x0a, 0x44, 0x58) /** * DOC: max_nr_entries (byte) * Maximum number of descriptor entries possible for each FRU. * * Values between '1' and '255' are valid. * No input or '0' will default to FMPM_DEFAULT_MAX_NR_ENTRIES. */ static u8 max_nr_entries; module_param(max_nr_entries, byte, 0644); MODULE_PARM_DESC(max_nr_entries, "Maximum number of memory poison descriptor entries per FRU"); #define FMPM_DEFAULT_MAX_NR_ENTRIES 8 /* Maximum number of FRUs in the system. */ #define FMPM_MAX_NR_FRU 256 static unsigned int max_nr_fru; /* Total length of record including headers and list of descriptor entries. */ static size_t max_rec_len; #define FMPM_MAX_REC_LEN (sizeof(struct fru_rec) + (sizeof(struct cper_fru_poison_desc) * 255)) /* Total number of SPA entries across all FRUs. */ static unsigned int spa_nr_entries; /* * Protect the local records cache in fru_records and prevent concurrent * writes to storage. This is only needed after init once notifier block * registration is done. * * The majority of a record is fixed at module init and will not change * during run time. The entries within a record will be updated as new * errors are reported. The mutex should be held whenever the entries are * accessed during run time. */ static DEFINE_MUTEX(fmpm_update_mutex); #define for_each_fru(i, rec) \ for (i = 0; rec = fru_records[i], i < max_nr_fru; i++) static inline u32 get_fmp_len(struct fru_rec *rec) { return rec->sec_desc.section_length - sizeof(struct cper_section_descriptor); } static struct fru_rec *get_fru_record(u64 fru_id) { struct fru_rec *rec; unsigned int i; for_each_fru(i, rec) { if (rec->fmp.fru_id == fru_id) return rec; } pr_debug("Record not found for FRU 0x%016llx\n", fru_id); return NULL; } /* * Sum up all bytes within the FRU Memory Poison Section including the Memory * Poison Descriptor entries. * * Don't include the old checksum here. It's a u32 value, so summing each of its * bytes will give the wrong total. */ static u32 do_fmp_checksum(struct cper_sec_fru_mem_poison *fmp, u32 len) { u32 checksum = 0; u8 *buf, *end; /* Skip old checksum. */ buf = (u8 *)fmp + sizeof(u32); end = buf + len; while (buf < end) checksum += (u8)(*(buf++)); return checksum; } static int update_record_on_storage(struct fru_rec *rec) { u32 len, checksum; int ret; /* Calculate a new checksum. */ len = get_fmp_len(rec); /* Get the current total. */ checksum = do_fmp_checksum(&rec->fmp, len); /* Use the complement value. */ rec->fmp.checksum = -checksum; pr_debug("Writing to storage\n"); ret = erst_write(&rec->hdr); if (ret) { pr_warn("Storage update failed for FRU 0x%016llx\n", rec->fmp.fru_id); if (ret == -ENOSPC) pr_warn("Not enough space on storage\n"); } return ret; } static bool rec_has_valid_entries(struct fru_rec *rec) { if (!(rec->fmp.validation_bits & FMP_VALID_LIST_ENTRIES)) return false; if (!(rec->fmp.validation_bits & FMP_VALID_LIST)) return false; return true; } static bool fpds_equal(struct cper_fru_poison_desc *old, struct cper_fru_poison_desc *new) { /* * Ignore timestamp field. * The same physical error may be reported multiple times due to stuck bits, etc. * * Also, order the checks from most->least likely to fail to shortcut the code. */ if (old->addr != new->addr) return false; if (old->hw_id != new->hw_id) return false; if (old->addr_type != new->addr_type) return false; if (old->hw_id_type != new->hw_id_type) return false; return true; } static bool rec_has_fpd(struct fru_rec *rec, struct cper_fru_poison_desc *fpd) { unsigned int i; for (i = 0; i < rec->fmp.nr_entries; i++) { struct cper_fru_poison_desc *fpd_i = &rec->entries[i]; if (fpds_equal(fpd_i, fpd)) { pr_debug("Found duplicate record\n"); return true; } } return false; } static void save_spa(struct fru_rec *rec, unsigned int entry, u64 addr, u64 id, unsigned int cpu) { unsigned int i, fru_idx, spa_entry; struct atl_err a_err; unsigned long spa; if (entry >= max_nr_entries) { pr_warn_once("FRU descriptor entry %d out-of-bounds (max: %d)\n", entry, max_nr_entries); return; } /* spa_nr_entries is always multiple of max_nr_entries */ for (i = 0; i < spa_nr_entries; i += max_nr_entries) { fru_idx = i / max_nr_entries; if (fru_records[fru_idx] == rec) break; } if (i >= spa_nr_entries) { pr_warn_once("FRU record %d not found\n", i); return; } spa_entry = i + entry; if (spa_entry >= spa_nr_entries) { pr_warn_once("spa_entries[] index out-of-bounds\n"); return; } memset(&a_err, 0, sizeof(struct atl_err)); a_err.addr = addr; a_err.ipid = id; a_err.cpu = cpu; spa = amd_convert_umc_mca_addr_to_sys_addr(&a_err); if (IS_ERR_VALUE(spa)) { pr_debug("Failed to get system address\n"); return; } spa_entries[spa_entry] = spa; pr_debug("fru_idx: %u, entry: %u, spa_entry: %u, spa: 0x%016llx\n", fru_idx, entry, spa_entry, spa_entries[spa_entry]); } static void update_fru_record(struct fru_rec *rec, struct mce *m) { struct cper_sec_fru_mem_poison *fmp = &rec->fmp; struct cper_fru_poison_desc fpd, *fpd_dest; u32 entry = 0; mutex_lock(&fmpm_update_mutex); memset(&fpd, 0, sizeof(struct cper_fru_poison_desc)); fpd.timestamp = m->time; fpd.hw_id_type = FPD_HW_ID_TYPE_MCA_IPID; fpd.hw_id = m->ipid; fpd.addr_type = FPD_ADDR_TYPE_MCA_ADDR; fpd.addr = m->addr; /* This is the first entry, so just save it. */ if (!rec_has_valid_entries(rec)) goto save_fpd; /* Ignore already recorded errors. */ if (rec_has_fpd(rec, &fpd)) goto out_unlock; if (rec->fmp.nr_entries >= max_nr_entries) { pr_warn("Exceeded number of entries for FRU 0x%016llx\n", rec->fmp.fru_id); goto out_unlock; } entry = fmp->nr_entries; save_fpd: save_spa(rec, entry, m->addr, m->ipid, m->extcpu); fpd_dest = &rec->entries[entry]; memcpy(fpd_dest, &fpd, sizeof(struct cper_fru_poison_desc)); fmp->nr_entries = entry + 1; fmp->validation_bits |= FMP_VALID_LIST_ENTRIES; fmp->validation_bits |= FMP_VALID_LIST; pr_debug("Updated FRU 0x%016llx entry #%u\n", fmp->fru_id, entry); update_record_on_storage(rec); out_unlock: mutex_unlock(&fmpm_update_mutex); } static void retire_dram_row(u64 addr, u64 id, u32 cpu) { struct atl_err a_err; memset(&a_err, 0, sizeof(struct atl_err)); a_err.addr = addr; a_err.ipid = id; a_err.cpu = cpu; amd_retire_dram_row(&a_err); } static int fru_handle_mem_poison(struct notifier_block *nb, unsigned long val, void *data) { struct mce *m = (struct mce *)data; struct fru_rec *rec; if (!mce_is_memory_error(m)) return NOTIFY_DONE; retire_dram_row(m->addr, m->ipid, m->extcpu); /* * An invalid FRU ID should not happen on real errors. But it * could happen from software error injection, etc. */ rec = get_fru_record(m->ppin); if (!rec) return NOTIFY_DONE; update_fru_record(rec, m); return NOTIFY_OK; } static struct notifier_block fru_mem_poison_nb = { .notifier_call = fru_handle_mem_poison, .priority = MCE_PRIO_LOWEST, }; static void retire_mem_fmp(struct fru_rec *rec) { struct cper_sec_fru_mem_poison *fmp = &rec->fmp; unsigned int i, cpu; for (i = 0; i < fmp->nr_entries; i++) { struct cper_fru_poison_desc *fpd = &rec->entries[i]; unsigned int err_cpu = INVALID_CPU; if (fpd->hw_id_type != FPD_HW_ID_TYPE_MCA_IPID) continue; if (fpd->addr_type != FPD_ADDR_TYPE_MCA_ADDR) continue; cpus_read_lock(); for_each_online_cpu(cpu) { if (topology_ppin(cpu) == fmp->fru_id) { err_cpu = cpu; break; } } cpus_read_unlock(); if (err_cpu == INVALID_CPU) continue; retire_dram_row(fpd->addr, fpd->hw_id, err_cpu); save_spa(rec, i, fpd->addr, fpd->hw_id, err_cpu); } } static void retire_mem_records(void) { struct fru_rec *rec; unsigned int i; for_each_fru(i, rec) { if (!rec_has_valid_entries(rec)) continue; retire_mem_fmp(rec); } } /* Set the CPER Record Header and CPER Section Descriptor fields. */ static void set_rec_fields(struct fru_rec *rec) { struct cper_section_descriptor *sec_desc = &rec->sec_desc; struct cper_record_header *hdr = &rec->hdr; /* * This is a saved record created with fewer max_nr_entries. * Update the record lengths and keep everything else as-is. */ if (hdr->record_length && hdr->record_length < max_rec_len) { pr_debug("Growing record 0x%016llx from %u to %zu bytes\n", hdr->record_id, hdr->record_length, max_rec_len); goto update_lengths; } memcpy(hdr->signature, CPER_SIG_RECORD, CPER_SIG_SIZE); hdr->revision = CPER_RECORD_REV; hdr->signature_end = CPER_SIG_END; /* * Currently, it is assumed that there is one FRU Memory Poison * section per CPER. But this may change for other implementations. */ hdr->section_count = 1; /* The logged errors are recoverable. Otherwise, they'd never make it here. */ hdr->error_severity = CPER_SEV_RECOVERABLE; hdr->validation_bits = 0; hdr->creator_id = CPER_CREATOR_FMP; hdr->notification_type = CPER_NOTIFY_MCE; hdr->record_id = cper_next_record_id(); hdr->flags = CPER_HW_ERROR_FLAGS_PREVERR; sec_desc->section_offset = sizeof(struct cper_record_header); sec_desc->revision = CPER_SEC_REV; sec_desc->validation_bits = 0; sec_desc->flags = CPER_SEC_PRIMARY; sec_desc->section_type = CPER_SECTION_TYPE_FMP; sec_desc->section_severity = CPER_SEV_RECOVERABLE; update_lengths: hdr->record_length = max_rec_len; sec_desc->section_length = max_rec_len - sizeof(struct cper_record_header); } static int save_new_records(void) { DECLARE_BITMAP(new_records, FMPM_MAX_NR_FRU); struct fru_rec *rec; unsigned int i; int ret = 0; for_each_fru(i, rec) { /* No need to update saved records that match the current record size. */ if (rec->hdr.record_length == max_rec_len) continue; if (!rec->hdr.record_length) set_bit(i, new_records); set_rec_fields(rec); ret = update_record_on_storage(rec); if (ret) goto out_clear; } return ret; out_clear: for_each_fru(i, rec) { if (!test_bit(i, new_records)) continue; erst_clear(rec->hdr.record_id); } return ret; } /* Check that the record matches expected types for the current system.*/ static bool fmp_is_usable(struct fru_rec *rec) { struct cper_sec_fru_mem_poison *fmp = &rec->fmp; u64 cpuid; pr_debug("Validation bits: 0x%016llx\n", fmp->validation_bits); if (!(fmp->validation_bits & FMP_VALID_ARCH_TYPE)) { pr_debug("Arch type unknown\n"); return false; } if (fmp->fru_arch_type != FMP_ARCH_TYPE_X86_CPUID_1_EAX) { pr_debug("Arch type not 'x86 Family/Model/Stepping'\n"); return false; } if (!(fmp->validation_bits & FMP_VALID_ARCH)) { pr_debug("Arch value unknown\n"); return false; } cpuid = cpuid_eax(1); if (fmp->fru_arch != cpuid) { pr_debug("Arch value mismatch: record = 0x%016llx, system = 0x%016llx\n", fmp->fru_arch, cpuid); return false; } if (!(fmp->validation_bits & FMP_VALID_ID_TYPE)) { pr_debug("FRU ID type unknown\n"); return false; } if (fmp->fru_id_type != FMP_ID_TYPE_X86_PPIN) { pr_debug("FRU ID type is not 'x86 PPIN'\n"); return false; } if (!(fmp->validation_bits & FMP_VALID_ID)) { pr_debug("FRU ID value unknown\n"); return false; } return true; } static bool fmp_is_valid(struct fru_rec *rec) { struct cper_sec_fru_mem_poison *fmp = &rec->fmp; u32 checksum, len; len = get_fmp_len(rec); if (len < sizeof(struct cper_sec_fru_mem_poison)) { pr_debug("fmp length is too small\n"); return false; } /* Checksum must sum to zero for the entire section. */ checksum = do_fmp_checksum(fmp, len) + fmp->checksum; if (checksum) { pr_debug("fmp checksum failed: sum = 0x%x\n", checksum); print_hex_dump_debug("fmp record: ", DUMP_PREFIX_NONE, 16, 1, fmp, len, false); return false; } if (!fmp_is_usable(rec)) return false; return true; } static struct fru_rec *get_valid_record(struct fru_rec *old) { struct fru_rec *new; if (!fmp_is_valid(old)) { pr_debug("Ignoring invalid record\n"); return NULL; } new = get_fru_record(old->fmp.fru_id); if (!new) pr_debug("Ignoring record for absent FRU\n"); return new; } /* * Fetch saved records from persistent storage. * * For each found record: * - If it was not created by this module, then ignore it. * - If it is valid, then copy its data to the local cache. * - If it is not valid, then erase it. */ static int get_saved_records(void) { struct fru_rec *old, *new; u64 record_id; int ret, pos; ssize_t len; old = kmalloc(FMPM_MAX_REC_LEN, GFP_KERNEL); if (!old) { ret = -ENOMEM; goto out; } ret = erst_get_record_id_begin(&pos); if (ret < 0) goto out_end; while (!erst_get_record_id_next(&pos, &record_id)) { if (record_id == APEI_ERST_INVALID_RECORD_ID) goto out_end; /* * Make sure to clear temporary buffer between reads to avoid * leftover data from records of various sizes. */ memset(old, 0, FMPM_MAX_REC_LEN); len = erst_read_record(record_id, &old->hdr, FMPM_MAX_REC_LEN, sizeof(struct fru_rec), &CPER_CREATOR_FMP); if (len < 0) continue; new = get_valid_record(old); if (!new) { erst_clear(record_id); continue; } if (len > max_rec_len) { unsigned int saved_nr_entries; saved_nr_entries = len - sizeof(struct fru_rec); saved_nr_entries /= sizeof(struct cper_fru_poison_desc); pr_warn("Saved record found with %u entries.\n", saved_nr_entries); pr_warn("Please increase max_nr_entries to %u.\n", saved_nr_entries); ret = -EINVAL; goto out_end; } /* Restore the record */ memcpy(new, old, len); } out_end: erst_get_record_id_end(); kfree(old); out: return ret; } static void set_fmp_fields(struct fru_rec *rec, unsigned int cpu) { struct cper_sec_fru_mem_poison *fmp = &rec->fmp; fmp->fru_arch_type = FMP_ARCH_TYPE_X86_CPUID_1_EAX; fmp->validation_bits |= FMP_VALID_ARCH_TYPE; /* Assume all CPUs in the system have the same value for now. */ fmp->fru_arch = cpuid_eax(1); fmp->validation_bits |= FMP_VALID_ARCH; fmp->fru_id_type = FMP_ID_TYPE_X86_PPIN; fmp->validation_bits |= FMP_VALID_ID_TYPE; fmp->fru_id = topology_ppin(cpu); fmp->validation_bits |= FMP_VALID_ID; } static int init_fmps(void) { struct fru_rec *rec; unsigned int i, cpu; int ret = 0; for_each_fru(i, rec) { unsigned int fru_cpu = INVALID_CPU; cpus_read_lock(); for_each_online_cpu(cpu) { if (topology_physical_package_id(cpu) == i) { fru_cpu = cpu; break; } } cpus_read_unlock(); if (fru_cpu == INVALID_CPU) { pr_debug("Failed to find matching CPU for FRU #%u\n", i); ret = -ENODEV; break; } set_fmp_fields(rec, fru_cpu); } return ret; } static int get_system_info(void) { /* Only load on MI300A systems for now. */ if (!(boot_cpu_data.x86_model >= 0x90 && boot_cpu_data.x86_model <= 0x9f)) return -ENODEV; if (!cpu_feature_enabled(X86_FEATURE_AMD_PPIN)) { pr_debug("PPIN feature not available\n"); return -ENODEV; } /* Use CPU socket as FRU for MI300 systems. */ max_nr_fru = topology_max_packages(); if (!max_nr_fru) return -ENODEV; if (max_nr_fru > FMPM_MAX_NR_FRU) { pr_warn("Too many FRUs to manage: found: %u, max: %u\n", max_nr_fru, FMPM_MAX_NR_FRU); return -ENODEV; } if (!max_nr_entries) max_nr_entries = FMPM_DEFAULT_MAX_NR_ENTRIES; spa_nr_entries = max_nr_fru * max_nr_entries; max_rec_len = sizeof(struct fru_rec); max_rec_len += sizeof(struct cper_fru_poison_desc) * max_nr_entries; pr_info("max FRUs: %u, max entries: %u, max record length: %lu\n", max_nr_fru, max_nr_entries, max_rec_len); return 0; } static void free_records(void) { struct fru_rec *rec; int i; for_each_fru(i, rec) kfree(rec); kfree(fru_records); kfree(spa_entries); } static int allocate_records(void) { int i, ret = 0; fru_records = kcalloc(max_nr_fru, sizeof(struct fru_rec *), GFP_KERNEL); if (!fru_records) { ret = -ENOMEM; goto out; } for (i = 0; i < max_nr_fru; i++) { fru_records[i] = kzalloc(max_rec_len, GFP_KERNEL); if (!fru_records[i]) { ret = -ENOMEM; goto out_free; } } spa_entries = kcalloc(spa_nr_entries, sizeof(u64), GFP_KERNEL); if (!spa_entries) { ret = -ENOMEM; goto out_free; } for (i = 0; i < spa_nr_entries; i++) spa_entries[i] = INVALID_SPA; return ret; out_free: while (--i >= 0) kfree(fru_records[i]); kfree(fru_records); out: return ret; } static void *fmpm_start(struct seq_file *f, loff_t *pos) { if (*pos >= (spa_nr_entries + 1)) return NULL; return pos; } static void *fmpm_next(struct seq_file *f, void *data, loff_t *pos) { if (++(*pos) >= (spa_nr_entries + 1)) return NULL; return pos; } static void fmpm_stop(struct seq_file *f, void *data) { } #define SHORT_WIDTH 8 #define U64_WIDTH 18 #define TIMESTAMP_WIDTH 19 #define LONG_WIDTH 24 #define U64_PAD (LONG_WIDTH - U64_WIDTH) #define TS_PAD (LONG_WIDTH - TIMESTAMP_WIDTH) static int fmpm_show(struct seq_file *f, void *data) { unsigned int fru_idx, entry, spa_entry, line; struct cper_fru_poison_desc *fpd; struct fru_rec *rec; line = *(loff_t *)data; if (line == 0) { seq_printf(f, "%-*s", SHORT_WIDTH, "fru_idx"); seq_printf(f, "%-*s", LONG_WIDTH, "fru_id"); seq_printf(f, "%-*s", SHORT_WIDTH, "entry"); seq_printf(f, "%-*s", LONG_WIDTH, "timestamp"); seq_printf(f, "%-*s", LONG_WIDTH, "hw_id"); seq_printf(f, "%-*s", LONG_WIDTH, "addr"); seq_printf(f, "%-*s", LONG_WIDTH, "spa"); goto out_newline; } spa_entry = line - 1; fru_idx = spa_entry / max_nr_entries; entry = spa_entry % max_nr_entries; rec = fru_records[fru_idx]; if (!rec) goto out; seq_printf(f, "%-*u", SHORT_WIDTH, fru_idx); seq_printf(f, "0x%016llx%-*s", rec->fmp.fru_id, U64_PAD, ""); seq_printf(f, "%-*u", SHORT_WIDTH, entry); mutex_lock(&fmpm_update_mutex); if (entry >= rec->fmp.nr_entries) { seq_printf(f, "%-*s", LONG_WIDTH, "*"); seq_printf(f, "%-*s", LONG_WIDTH, "*"); seq_printf(f, "%-*s", LONG_WIDTH, "*"); seq_printf(f, "%-*s", LONG_WIDTH, "*"); goto out_unlock; } fpd = &rec->entries[entry]; seq_printf(f, "%ptT%-*s", &fpd->timestamp, TS_PAD, ""); seq_printf(f, "0x%016llx%-*s", fpd->hw_id, U64_PAD, ""); seq_printf(f, "0x%016llx%-*s", fpd->addr, U64_PAD, ""); if (spa_entries[spa_entry] == INVALID_SPA) seq_printf(f, "%-*s", LONG_WIDTH, "*"); else seq_printf(f, "0x%016llx%-*s", spa_entries[spa_entry], U64_PAD, ""); out_unlock: mutex_unlock(&fmpm_update_mutex); out_newline: seq_putc(f, '\n'); out: return 0; } static const struct seq_operations fmpm_seq_ops = { .start = fmpm_start, .next = fmpm_next, .stop = fmpm_stop, .show = fmpm_show, }; static int fmpm_open(struct inode *inode, struct file *file) { return seq_open(file, &fmpm_seq_ops); } static const struct file_operations fmpm_fops = { .open = fmpm_open, .release = seq_release, .read = seq_read, .llseek = seq_lseek, }; static void setup_debugfs(void) { struct dentry *dfs = ras_get_debugfs_root(); if (!dfs) return; fmpm_dfs_dir = debugfs_create_dir("fmpm", dfs); if (!fmpm_dfs_dir) return; fmpm_dfs_entries = debugfs_create_file("entries", 0400, fmpm_dfs_dir, NULL, &fmpm_fops); if (!fmpm_dfs_entries) debugfs_remove(fmpm_dfs_dir); } static const struct x86_cpu_id fmpm_cpuids[] = { X86_MATCH_VENDOR_FAM(AMD, 0x19, NULL), { } }; MODULE_DEVICE_TABLE(x86cpu, fmpm_cpuids); static int __init fru_mem_poison_init(void) { int ret; if (!x86_match_cpu(fmpm_cpuids)) { ret = -ENODEV; goto out; } if (erst_disable) { pr_debug("ERST not available\n"); ret = -ENODEV; goto out; } ret = get_system_info(); if (ret) goto out; ret = allocate_records(); if (ret) goto out; ret = init_fmps(); if (ret) goto out_free; ret = get_saved_records(); if (ret) goto out_free; ret = save_new_records(); if (ret) goto out_free; setup_debugfs(); retire_mem_records(); mce_register_decode_chain(&fru_mem_poison_nb); pr_info("FRU Memory Poison Manager initialized\n"); return 0; out_free: free_records(); out: return ret; } static void __exit fru_mem_poison_exit(void) { mce_unregister_decode_chain(&fru_mem_poison_nb); debugfs_remove(fmpm_dfs_dir); free_records(); } module_init(fru_mem_poison_init); module_exit(fru_mem_poison_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("FRU Memory Poison Manager");