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314 lines
8.3 KiB
314 lines
8.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Extended Error Log driver |
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* |
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* Copyright (C) 2013 Intel Corp. |
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* Author: Chen, Gong <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/acpi.h> |
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#include <linux/cper.h> |
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#include <linux/ratelimit.h> |
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#include <linux/edac.h> |
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#include <linux/ras.h> |
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#include <asm/cpu.h> |
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#include <asm/mce.h> |
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#include "apei/apei-internal.h" |
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#include <ras/ras_event.h> |
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#define EXT_ELOG_ENTRY_MASK GENMASK_ULL(51, 0) /* elog entry address mask */ |
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#define EXTLOG_DSM_REV 0x0 |
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#define EXTLOG_FN_ADDR 0x1 |
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#define FLAG_OS_OPTIN BIT(0) |
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#define ELOG_ENTRY_VALID (1ULL<<63) |
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#define ELOG_ENTRY_LEN 0x1000 |
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#define EMCA_BUG \ |
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"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n" |
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struct extlog_l1_head { |
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u32 ver; /* Header Version */ |
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u32 hdr_len; /* Header Length */ |
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u64 total_len; /* entire L1 Directory length including this header */ |
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u64 elog_base; /* MCA Error Log Directory base address */ |
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u64 elog_len; /* MCA Error Log Directory length */ |
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u32 flags; /* bit 0 - OS/VMM Opt-in */ |
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u8 rev0[12]; |
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u32 entries; /* Valid L1 Directory entries per logical processor */ |
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u8 rev1[12]; |
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}; |
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static u8 extlog_dsm_uuid[] __initdata = "663E35AF-CC10-41A4-88EA-5470AF055295"; |
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/* L1 table related physical address */ |
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static u64 elog_base; |
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static size_t elog_size; |
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static u64 l1_dirbase; |
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static size_t l1_size; |
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/* L1 table related virtual address */ |
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static void __iomem *extlog_l1_addr; |
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static void __iomem *elog_addr; |
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static void *elog_buf; |
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static u64 *l1_entry_base; |
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static u32 l1_percpu_entry; |
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#define ELOG_IDX(cpu, bank) \ |
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(cpu_physical_id(cpu) * l1_percpu_entry + (bank)) |
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#define ELOG_ENTRY_DATA(idx) \ |
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(*(l1_entry_base + (idx))) |
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#define ELOG_ENTRY_ADDR(phyaddr) \ |
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(phyaddr - elog_base + (u8 *)elog_addr) |
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static struct acpi_hest_generic_status *extlog_elog_entry_check(int cpu, int bank) |
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{ |
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int idx; |
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u64 data; |
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struct acpi_hest_generic_status *estatus; |
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WARN_ON(cpu < 0); |
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idx = ELOG_IDX(cpu, bank); |
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data = ELOG_ENTRY_DATA(idx); |
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if ((data & ELOG_ENTRY_VALID) == 0) |
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return NULL; |
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data &= EXT_ELOG_ENTRY_MASK; |
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estatus = (struct acpi_hest_generic_status *)ELOG_ENTRY_ADDR(data); |
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/* if no valid data in elog entry, just return */ |
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if (estatus->block_status == 0) |
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return NULL; |
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return estatus; |
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} |
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static void __print_extlog_rcd(const char *pfx, |
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struct acpi_hest_generic_status *estatus, int cpu) |
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{ |
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static atomic_t seqno; |
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unsigned int curr_seqno; |
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char pfx_seq[64]; |
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if (!pfx) { |
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if (estatus->error_severity <= CPER_SEV_CORRECTED) |
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pfx = KERN_INFO; |
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else |
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pfx = KERN_ERR; |
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} |
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curr_seqno = atomic_inc_return(&seqno); |
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snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno); |
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printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu); |
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cper_estatus_print(pfx_seq, estatus); |
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} |
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static int print_extlog_rcd(const char *pfx, |
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struct acpi_hest_generic_status *estatus, int cpu) |
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{ |
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/* Not more than 2 messages every 5 seconds */ |
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static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2); |
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static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2); |
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struct ratelimit_state *ratelimit; |
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if (estatus->error_severity == CPER_SEV_CORRECTED || |
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(estatus->error_severity == CPER_SEV_INFORMATIONAL)) |
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ratelimit = &ratelimit_corrected; |
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else |
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ratelimit = &ratelimit_uncorrected; |
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if (__ratelimit(ratelimit)) { |
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__print_extlog_rcd(pfx, estatus, cpu); |
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return 0; |
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} |
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return 1; |
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} |
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static int extlog_print(struct notifier_block *nb, unsigned long val, |
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void *data) |
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{ |
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struct mce *mce = (struct mce *)data; |
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int bank = mce->bank; |
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int cpu = mce->extcpu; |
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struct acpi_hest_generic_status *estatus, *tmp; |
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struct acpi_hest_generic_data *gdata; |
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const guid_t *fru_id = &guid_null; |
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char *fru_text = ""; |
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guid_t *sec_type; |
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static u32 err_seq; |
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estatus = extlog_elog_entry_check(cpu, bank); |
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if (estatus == NULL || (mce->kflags & MCE_HANDLED_CEC)) |
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return NOTIFY_DONE; |
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memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN); |
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/* clear record status to enable BIOS to update it again */ |
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estatus->block_status = 0; |
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tmp = (struct acpi_hest_generic_status *)elog_buf; |
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if (!ras_userspace_consumers()) { |
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print_extlog_rcd(NULL, tmp, cpu); |
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goto out; |
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} |
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/* log event via trace */ |
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err_seq++; |
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gdata = (struct acpi_hest_generic_data *)(tmp + 1); |
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if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID) |
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fru_id = (guid_t *)gdata->fru_id; |
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if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT) |
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fru_text = gdata->fru_text; |
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sec_type = (guid_t *)gdata->section_type; |
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if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) { |
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struct cper_sec_mem_err *mem = (void *)(gdata + 1); |
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if (gdata->error_data_length >= sizeof(*mem)) |
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trace_extlog_mem_event(mem, err_seq, fru_id, fru_text, |
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(u8)gdata->error_severity); |
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} |
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out: |
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mce->kflags |= MCE_HANDLED_EXTLOG; |
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return NOTIFY_OK; |
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} |
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static bool __init extlog_get_l1addr(void) |
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{ |
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guid_t guid; |
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acpi_handle handle; |
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union acpi_object *obj; |
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if (guid_parse(extlog_dsm_uuid, &guid)) |
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return false; |
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if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) |
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return false; |
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if (!acpi_check_dsm(handle, &guid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR)) |
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return false; |
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obj = acpi_evaluate_dsm_typed(handle, &guid, EXTLOG_DSM_REV, |
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EXTLOG_FN_ADDR, NULL, ACPI_TYPE_INTEGER); |
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if (!obj) { |
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return false; |
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} else { |
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l1_dirbase = obj->integer.value; |
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ACPI_FREE(obj); |
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} |
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/* Spec says L1 directory must be 4K aligned, bail out if it isn't */ |
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if (l1_dirbase & ((1 << 12) - 1)) { |
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pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n", |
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l1_dirbase); |
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return false; |
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} |
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return true; |
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} |
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static struct notifier_block extlog_mce_dec = { |
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.notifier_call = extlog_print, |
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.priority = MCE_PRIO_EXTLOG, |
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}; |
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static int __init extlog_init(void) |
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{ |
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struct extlog_l1_head *l1_head; |
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void __iomem *extlog_l1_hdr; |
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size_t l1_hdr_size; |
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struct resource *r; |
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u64 cap; |
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int rc; |
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if (rdmsrl_safe(MSR_IA32_MCG_CAP, &cap) || |
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!(cap & MCG_ELOG_P) || |
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!extlog_get_l1addr()) |
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return -ENODEV; |
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rc = -EINVAL; |
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/* get L1 header to fetch necessary information */ |
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l1_hdr_size = sizeof(struct extlog_l1_head); |
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r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR"); |
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if (!r) { |
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pr_warn(FW_BUG EMCA_BUG, |
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(unsigned long long)l1_dirbase, |
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(unsigned long long)l1_dirbase + l1_hdr_size); |
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goto err; |
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} |
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extlog_l1_hdr = acpi_os_map_iomem(l1_dirbase, l1_hdr_size); |
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l1_head = (struct extlog_l1_head *)extlog_l1_hdr; |
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l1_size = l1_head->total_len; |
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l1_percpu_entry = l1_head->entries; |
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elog_base = l1_head->elog_base; |
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elog_size = l1_head->elog_len; |
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acpi_os_unmap_iomem(extlog_l1_hdr, l1_hdr_size); |
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release_mem_region(l1_dirbase, l1_hdr_size); |
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/* remap L1 header again based on completed information */ |
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r = request_mem_region(l1_dirbase, l1_size, "L1 Table"); |
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if (!r) { |
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pr_warn(FW_BUG EMCA_BUG, |
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(unsigned long long)l1_dirbase, |
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(unsigned long long)l1_dirbase + l1_size); |
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goto err; |
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} |
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extlog_l1_addr = acpi_os_map_iomem(l1_dirbase, l1_size); |
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l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size); |
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/* remap elog table */ |
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r = request_mem_region(elog_base, elog_size, "Elog Table"); |
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if (!r) { |
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pr_warn(FW_BUG EMCA_BUG, |
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(unsigned long long)elog_base, |
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(unsigned long long)elog_base + elog_size); |
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goto err_release_l1_dir; |
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} |
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elog_addr = acpi_os_map_iomem(elog_base, elog_size); |
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rc = -ENOMEM; |
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/* allocate buffer to save elog record */ |
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elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL); |
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if (elog_buf == NULL) |
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goto err_release_elog; |
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mce_register_decode_chain(&extlog_mce_dec); |
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/* enable OS to be involved to take over management from BIOS */ |
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((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN; |
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return 0; |
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err_release_elog: |
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if (elog_addr) |
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acpi_os_unmap_iomem(elog_addr, elog_size); |
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release_mem_region(elog_base, elog_size); |
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err_release_l1_dir: |
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if (extlog_l1_addr) |
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acpi_os_unmap_iomem(extlog_l1_addr, l1_size); |
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release_mem_region(l1_dirbase, l1_size); |
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err: |
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pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n"); |
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return rc; |
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} |
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static void __exit extlog_exit(void) |
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{ |
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mce_unregister_decode_chain(&extlog_mce_dec); |
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((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN; |
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if (extlog_l1_addr) |
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acpi_os_unmap_iomem(extlog_l1_addr, l1_size); |
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if (elog_addr) |
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acpi_os_unmap_iomem(elog_addr, elog_size); |
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release_mem_region(elog_base, elog_size); |
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release_mem_region(l1_dirbase, l1_size); |
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kfree(elog_buf); |
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} |
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module_init(extlog_init); |
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module_exit(extlog_exit); |
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MODULE_AUTHOR("Chen, Gong <[email protected]>"); |
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MODULE_DESCRIPTION("Extended MCA Error Log Driver"); |
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MODULE_LICENSE("GPL");
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