diff options
Diffstat (limited to 'drivers/acpi/acpi_extlog.c')
| -rw-r--r-- | drivers/acpi/acpi_extlog.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c new file mode 100644 index 000000000..088db2356 --- /dev/null +++ b/drivers/acpi/acpi_extlog.c @@ -0,0 +1,326 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Extended Error Log driver + * + * Copyright (C) 2013 Intel Corp. + * Author: Chen, Gong <gong.chen@intel.com> + */ + +#include <linux/module.h> +#include <linux/acpi.h> +#include <linux/cper.h> +#include <linux/ratelimit.h> +#include <linux/edac.h> +#include <linux/ras.h> +#include <acpi/ghes.h> +#include <asm/cpu.h> +#include <asm/mce.h> + +#include "apei/apei-internal.h" +#include <ras/ras_event.h> + +#define EXT_ELOG_ENTRY_MASK GENMASK_ULL(51, 0) /* elog entry address mask */ + +#define EXTLOG_DSM_REV 0x0 +#define EXTLOG_FN_ADDR 0x1 + +#define FLAG_OS_OPTIN BIT(0) +#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[] __initdata = "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_hest_generic_status *extlog_elog_entry_check(int cpu, int bank) +{ + int idx; + u64 data; + struct acpi_hest_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_hest_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_hest_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_hest_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_hest_generic_status *estatus, *tmp; + struct acpi_hest_generic_data *gdata; + const guid_t *fru_id; + char *fru_text; + guid_t *sec_type; + static u32 err_seq; + + estatus = extlog_elog_entry_check(cpu, bank); + if (!estatus) + return NOTIFY_DONE; + + if (mce->kflags & MCE_HANDLED_CEC) { + estatus->block_status = 0; + 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; + + tmp = (struct acpi_hest_generic_status *)elog_buf; + + if (!ras_userspace_consumers()) { + print_extlog_rcd(NULL, tmp, cpu); + goto out; + } + + /* log event via trace */ + err_seq++; + apei_estatus_for_each_section(tmp, gdata) { + if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID) + fru_id = (guid_t *)gdata->fru_id; + else + fru_id = &guid_null; + if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT) + fru_text = gdata->fru_text; + else + fru_text = ""; + sec_type = (guid_t *)gdata->section_type; + if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) { + struct cper_sec_mem_err *mem = (void *)(gdata + 1); + + if (gdata->error_data_length >= sizeof(*mem)) + trace_extlog_mem_event(mem, err_seq, fru_id, fru_text, + (u8)gdata->error_severity); + } + } + +out: + mce->kflags |= MCE_HANDLED_EXTLOG; + return NOTIFY_OK; +} + +static bool __init extlog_get_l1addr(void) +{ + guid_t guid; + acpi_handle handle; + union acpi_object *obj; + + if (guid_parse(extlog_dsm_uuid, &guid)) + return false; + if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) + return false; + if (!acpi_check_dsm(handle, &guid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR)) + return false; + obj = acpi_evaluate_dsm_typed(handle, &guid, EXTLOG_DSM_REV, + EXTLOG_FN_ADDR, NULL, ACPI_TYPE_INTEGER); + if (!obj) { + return false; + } else { + l1_dirbase = obj->integer.value; + ACPI_FREE(obj); + } + + /* 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, + .priority = MCE_PRIO_EXTLOG, +}; + +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; + + if (rdmsrl_safe(MSR_IA32_MCG_CAP, &cap) || + !(cap & MCG_ELOG_P) || + !extlog_get_l1addr()) + return -ENODEV; + + 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_iomem(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_iomem(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_iomem(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_iomem(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_iomem(elog_addr, elog_size); + release_mem_region(elog_base, elog_size); +err_release_l1_dir: + if (extlog_l1_addr) + acpi_os_unmap_iomem(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_iomem(extlog_l1_addr, l1_size); + if (elog_addr) + acpi_os_unmap_iomem(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"); |