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![Ben Hutchings](/assets/img/avatar_default.png)
extlog_init() uses rdmsrl() to read an MSR, which on older CPUs provokes a error message at boot: unchecked MSR access error: RDMSR from 0x179 at rIP: 0xcd047307 (native_read_msr+0x7/0x40) Use rdmsrl_safe() instead, and return -ENODEV if it fails. Reported-by: jim@photojim.ca References: https://bugs.debian.org/971058 Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
314 lines
8.3 KiB
C
314 lines
8.3 KiB
C
// 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 <gong.chen@intel.com>
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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 <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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