Merge tag 'please-pull-eMCA-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras into x86/mce
Pull MCE updates from Tony Luck:
"There is a enhanced error logging mechanism for Xeon processors.
Full description is here:
http://www.intel.com/content/www/us/en/architecture-and-technology/enhanced-mca-logging-xeon-paper.html
This patch series provides a module (and support code) to
check for an extended error log and print extra details about
the error on the console.
"
Signed-off-by: Ingo Molnar <mingo@kernel.org>
tirimbino
Ingo Molnar
11 years ago
commit
d69525789e
@ -0,0 +1,327 @@ |
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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 <gong.chen@intel.com> |
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* |
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* This file is licensed under GPLv2. |
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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 <acpi/acpi_bus.h> |
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#include <linux/cper.h> |
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#include <linux/ratelimit.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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#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_QUERY 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 EXTLOG_QUERY_L1_EXIST BIT(1) |
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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[] = "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_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_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_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_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_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_generic_status *estatus; |
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int rc; |
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estatus = extlog_elog_entry_check(cpu, bank); |
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if (estatus == NULL) |
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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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rc = print_extlog_rcd(NULL, (struct acpi_generic_status *)elog_buf, cpu); |
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return NOTIFY_DONE; |
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} |
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static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret) |
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{ |
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struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; |
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struct acpi_object_list input; |
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union acpi_object params[4], *obj; |
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u8 uuid[16]; |
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int i; |
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acpi_str_to_uuid(extlog_dsm_uuid, uuid); |
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input.count = 4; |
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input.pointer = params; |
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params[0].type = ACPI_TYPE_BUFFER; |
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params[0].buffer.length = 16; |
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params[0].buffer.pointer = uuid; |
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params[1].type = ACPI_TYPE_INTEGER; |
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params[1].integer.value = rev; |
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params[2].type = ACPI_TYPE_INTEGER; |
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params[2].integer.value = func; |
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params[3].type = ACPI_TYPE_PACKAGE; |
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params[3].package.count = 0; |
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params[3].package.elements = NULL; |
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if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf))) |
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return -1; |
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*ret = 0; |
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obj = (union acpi_object *)buf.pointer; |
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if (obj->type == ACPI_TYPE_INTEGER) { |
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*ret = obj->integer.value; |
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} else if (obj->type == ACPI_TYPE_BUFFER) { |
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if (obj->buffer.length <= 8) { |
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for (i = 0; i < obj->buffer.length; i++) |
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*ret |= (obj->buffer.pointer[i] << (i * 8)); |
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} |
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} |
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kfree(buf.pointer); |
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return 0; |
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} |
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static bool extlog_get_l1addr(void) |
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{ |
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acpi_handle handle; |
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u64 ret; |
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if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) |
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return false; |
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if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_QUERY, &ret) || |
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!(ret & EXTLOG_QUERY_L1_EXIST)) |
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return false; |
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if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_ADDR, &ret)) |
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return false; |
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l1_dirbase = ret; |
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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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}; |
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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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rc = -ENODEV; |
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rdmsrl(MSR_IA32_MCG_CAP, cap); |
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if (!(cap & MCG_ELOG_P)) |
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return rc; |
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if (!extlog_get_l1addr()) |
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return rc; |
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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_memory(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_memory(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_memory(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_memory(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_memory(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_memory(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_memory(extlog_l1_addr, l1_size); |
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if (elog_addr) |
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acpi_os_unmap_memory(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 <gong.chen@intel.com>"); |
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MODULE_DESCRIPTION("Extended MCA Error Log Driver"); |
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MODULE_LICENSE("GPL"); |
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