Commit 4b3db708 authored by Chen, Gong's avatar Chen, Gong Committed by Tony Luck

ACPI, x86: Extended error log driver for x86 platform

This H/W error log driver (a.k.a eMCA driver) is implemented based on
http://www.intel.com/content/www/us/en/architecture-and-technology/enhanced-mca-logging-xeon-paper.html

After errors are captured, more detailed platform specific information
can be got via this new enhanced H/W error log driver. Most notably we
can track memory errors back to the DIMM slot silk screen label.
Signed-off-by: default avatarChen, Gong <gong.chen@linux.intel.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 10ef6b0d
......@@ -16,6 +16,7 @@
#define MCG_EXT_CNT_SHIFT 16
#define MCG_EXT_CNT(c) (((c) & MCG_EXT_CNT_MASK) >> MCG_EXT_CNT_SHIFT)
#define MCG_SER_P (1ULL<<24) /* MCA recovery/new status bits */
#define MCG_ELOG_P (1ULL<<26) /* Extended error log supported */
/* MCG_STATUS register defines */
#define MCG_STATUS_RIPV (1ULL<<0) /* restart ip valid */
......
......@@ -372,4 +372,23 @@ config ACPI_BGRT
source "drivers/acpi/apei/Kconfig"
config ACPI_EXTLOG
tristate "Extended Error Log support"
depends on X86_MCE && ACPI_APEI
default n
help
Certain usages such as Predictive Failure Analysis (PFA) require
more information about the error than what can be described in
processor machine check banks. Most server processors log
additional information about the error in processor uncore
registers. Since the addresses and layout of these registers vary
widely from one processor to another, system software cannot
readily make use of them. To complicate matters further, some of
the additional error information cannot be constructed without
detailed knowledge about platform topology.
Enhanced MCA Logging allows firmware to provide additional error
information to system software, synchronous with MCE or CMCI. This
driver adds support for that functionality.
endif # ACPI
......@@ -82,3 +82,5 @@ processor-$(CONFIG_CPU_FREQ) += processor_perflib.o
obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
obj-$(CONFIG_ACPI_APEI) += apei/
obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o
/*
* Extended Error Log driver
*
* Copyright (C) 2013 Intel Corp.
* Author: Chen, Gong <gong.chen@intel.com>
*
* This file is licensed under GPLv2.
*/
#include <linux/module.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <linux/cper.h>
#include <linux/ratelimit.h>
#include <asm/cpu.h>
#include <asm/mce.h>
#include "apei/apei-internal.h"
#define EXT_ELOG_ENTRY_MASK GENMASK_ULL(51, 0) /* elog entry address mask */
#define EXTLOG_DSM_REV 0x0
#define EXTLOG_FN_QUERY 0x0
#define EXTLOG_FN_ADDR 0x1
#define FLAG_OS_OPTIN BIT(0)
#define EXTLOG_QUERY_L1_EXIST BIT(1)
#define ELOG_ENTRY_VALID (1ULL<<63)
#define ELOG_ENTRY_LEN 0x1000
#define EMCA_BUG \
"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n"
struct extlog_l1_head {
u32 ver; /* Header Version */
u32 hdr_len; /* Header Length */
u64 total_len; /* entire L1 Directory length including this header */
u64 elog_base; /* MCA Error Log Directory base address */
u64 elog_len; /* MCA Error Log Directory length */
u32 flags; /* bit 0 - OS/VMM Opt-in */
u8 rev0[12];
u32 entries; /* Valid L1 Directory entries per logical processor */
u8 rev1[12];
};
static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";
/* L1 table related physical address */
static u64 elog_base;
static size_t elog_size;
static u64 l1_dirbase;
static size_t l1_size;
/* L1 table related virtual address */
static void __iomem *extlog_l1_addr;
static void __iomem *elog_addr;
static void *elog_buf;
static u64 *l1_entry_base;
static u32 l1_percpu_entry;
#define ELOG_IDX(cpu, bank) \
(cpu_physical_id(cpu) * l1_percpu_entry + (bank))
#define ELOG_ENTRY_DATA(idx) \
(*(l1_entry_base + (idx)))
#define ELOG_ENTRY_ADDR(phyaddr) \
(phyaddr - elog_base + (u8 *)elog_addr)
static struct acpi_generic_status *extlog_elog_entry_check(int cpu, int bank)
{
int idx;
u64 data;
struct acpi_generic_status *estatus;
WARN_ON(cpu < 0);
idx = ELOG_IDX(cpu, bank);
data = ELOG_ENTRY_DATA(idx);
if ((data & ELOG_ENTRY_VALID) == 0)
return NULL;
data &= EXT_ELOG_ENTRY_MASK;
estatus = (struct acpi_generic_status *)ELOG_ENTRY_ADDR(data);
/* if no valid data in elog entry, just return */
if (estatus->block_status == 0)
return NULL;
return estatus;
}
static void __print_extlog_rcd(const char *pfx,
struct acpi_generic_status *estatus, int cpu)
{
static atomic_t seqno;
unsigned int curr_seqno;
char pfx_seq[64];
if (!pfx) {
if (estatus->error_severity <= CPER_SEV_CORRECTED)
pfx = KERN_INFO;
else
pfx = KERN_ERR;
}
curr_seqno = atomic_inc_return(&seqno);
snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
cper_estatus_print(pfx_seq, estatus);
}
static int print_extlog_rcd(const char *pfx,
struct acpi_generic_status *estatus, int cpu)
{
/* Not more than 2 messages every 5 seconds */
static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
struct ratelimit_state *ratelimit;
if (estatus->error_severity == CPER_SEV_CORRECTED ||
(estatus->error_severity == CPER_SEV_INFORMATIONAL))
ratelimit = &ratelimit_corrected;
else
ratelimit = &ratelimit_uncorrected;
if (__ratelimit(ratelimit)) {
__print_extlog_rcd(pfx, estatus, cpu);
return 0;
}
return 1;
}
static int extlog_print(struct notifier_block *nb, unsigned long val,
void *data)
{
struct mce *mce = (struct mce *)data;
int bank = mce->bank;
int cpu = mce->extcpu;
struct acpi_generic_status *estatus;
int rc;
estatus = extlog_elog_entry_check(cpu, bank);
if (estatus == NULL)
return NOTIFY_DONE;
memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
/* clear record status to enable BIOS to update it again */
estatus->block_status = 0;
rc = print_extlog_rcd(NULL, (struct acpi_generic_status *)elog_buf, cpu);
return NOTIFY_DONE;
}
static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
{
struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
struct acpi_object_list input;
union acpi_object params[4], *obj;
u8 uuid[16];
int i;
acpi_str_to_uuid(extlog_dsm_uuid, uuid);
input.count = 4;
input.pointer = params;
params[0].type = ACPI_TYPE_BUFFER;
params[0].buffer.length = 16;
params[0].buffer.pointer = uuid;
params[1].type = ACPI_TYPE_INTEGER;
params[1].integer.value = rev;
params[2].type = ACPI_TYPE_INTEGER;
params[2].integer.value = func;
params[3].type = ACPI_TYPE_PACKAGE;
params[3].package.count = 0;
params[3].package.elements = NULL;
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf)))
return -1;
*ret = 0;
obj = (union acpi_object *)buf.pointer;
if (obj->type == ACPI_TYPE_INTEGER) {
*ret = obj->integer.value;
} else if (obj->type == ACPI_TYPE_BUFFER) {
if (obj->buffer.length <= 8) {
for (i = 0; i < obj->buffer.length; i++)
*ret |= (obj->buffer.pointer[i] << (i * 8));
}
}
kfree(buf.pointer);
return 0;
}
static bool extlog_get_l1addr(void)
{
acpi_handle handle;
u64 ret;
if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
return false;
if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_QUERY, &ret) ||
!(ret & EXTLOG_QUERY_L1_EXIST))
return false;
if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_ADDR, &ret))
return false;
l1_dirbase = ret;
/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
if (l1_dirbase & ((1 << 12) - 1)) {
pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
l1_dirbase);
return false;
}
return true;
}
static struct notifier_block extlog_mce_dec = {
.notifier_call = extlog_print,
};
static int __init extlog_init(void)
{
struct extlog_l1_head *l1_head;
void __iomem *extlog_l1_hdr;
size_t l1_hdr_size;
struct resource *r;
u64 cap;
int rc;
rc = -ENODEV;
rdmsrl(MSR_IA32_MCG_CAP, cap);
if (!(cap & MCG_ELOG_P))
return rc;
if (!extlog_get_l1addr())
return rc;
rc = -EINVAL;
/* get L1 header to fetch necessary information */
l1_hdr_size = sizeof(struct extlog_l1_head);
r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
if (!r) {
pr_warn(FW_BUG EMCA_BUG,
(unsigned long long)l1_dirbase,
(unsigned long long)l1_dirbase + l1_hdr_size);
goto err;
}
extlog_l1_hdr = acpi_os_map_memory(l1_dirbase, l1_hdr_size);
l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
l1_size = l1_head->total_len;
l1_percpu_entry = l1_head->entries;
elog_base = l1_head->elog_base;
elog_size = l1_head->elog_len;
acpi_os_unmap_memory(extlog_l1_hdr, l1_hdr_size);
release_mem_region(l1_dirbase, l1_hdr_size);
/* remap L1 header again based on completed information */
r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
if (!r) {
pr_warn(FW_BUG EMCA_BUG,
(unsigned long long)l1_dirbase,
(unsigned long long)l1_dirbase + l1_size);
goto err;
}
extlog_l1_addr = acpi_os_map_memory(l1_dirbase, l1_size);
l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size);
/* remap elog table */
r = request_mem_region(elog_base, elog_size, "Elog Table");
if (!r) {
pr_warn(FW_BUG EMCA_BUG,
(unsigned long long)elog_base,
(unsigned long long)elog_base + elog_size);
goto err_release_l1_dir;
}
elog_addr = acpi_os_map_memory(elog_base, elog_size);
rc = -ENOMEM;
/* allocate buffer to save elog record */
elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
if (elog_buf == NULL)
goto err_release_elog;
mce_register_decode_chain(&extlog_mce_dec);
/* enable OS to be involved to take over management from BIOS */
((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN;
return 0;
err_release_elog:
if (elog_addr)
acpi_os_unmap_memory(elog_addr, elog_size);
release_mem_region(elog_base, elog_size);
err_release_l1_dir:
if (extlog_l1_addr)
acpi_os_unmap_memory(extlog_l1_addr, l1_size);
release_mem_region(l1_dirbase, l1_size);
err:
pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
return rc;
}
static void __exit extlog_exit(void)
{
mce_unregister_decode_chain(&extlog_mce_dec);
((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
if (extlog_l1_addr)
acpi_os_unmap_memory(extlog_l1_addr, l1_size);
if (elog_addr)
acpi_os_unmap_memory(elog_addr, elog_size);
release_mem_region(elog_base, elog_size);
release_mem_region(l1_dirbase, l1_size);
kfree(elog_buf);
}
module_init(extlog_init);
module_exit(extlog_exit);
MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
MODULE_DESCRIPTION("Extended MCA Error Log Driver");
MODULE_LICENSE("GPL");
......@@ -174,7 +174,7 @@ static void acpi_print_osc_error(acpi_handle handle,
printk("\n");
}
static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
{
int i;
static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
......@@ -195,6 +195,7 @@ static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
}
return AE_OK;
}
EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
{
......
......@@ -311,6 +311,7 @@ struct acpi_osc_context {
#define OSC_INVALID_REVISION_ERROR 8
#define OSC_CAPABILITIES_MASK_ERROR 16
acpi_status acpi_str_to_uuid(char *str, u8 *uuid);
acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
/* platform-wide _OSC bits */
......
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