--- /dev/null
+/*
+ * 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 <linux/cper.h>
+#include <linux/ratelimit.h>
+#include <linux/edac.h>
+#include <linux/ras.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 int old_edac_report_status;
+
+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 uuid_le *fru_id = &NULL_UUID_LE;
+ char *fru_text = "";
+ uuid_le *sec_type;
+ static u32 err_seq;
+
+ 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;
+
+ 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++;
+ gdata = (struct acpi_hest_generic_data *)(tmp + 1);
+ if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
+ fru_id = (uuid_le *)gdata->fru_id;
+ if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
+ fru_text = gdata->fru_text;
+ sec_type = (uuid_le *)gdata->section_type;
+ if (!uuid_le_cmp(*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:
+ return NOTIFY_STOP;
+}
+
+static bool __init extlog_get_l1addr(void)
+{
+ u8 uuid[16];
+ acpi_handle handle;
+ union acpi_object *obj;
+
+ acpi_str_to_uuid(extlog_dsm_uuid, uuid);
+
+ if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
+ return false;
+ if (!acpi_check_dsm(handle, uuid, EXTLOG_DSM_REV, 1 << EXTLOG_FN_ADDR))
+ return false;
+ obj = acpi_evaluate_dsm_typed(handle, uuid, 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,
+};
+
+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;
+
+ rdmsrl(MSR_IA32_MCG_CAP, cap);
+
+ if (!(cap & MCG_ELOG_P) || !extlog_get_l1addr())
+ return -ENODEV;
+
+ if (get_edac_report_status() == EDAC_REPORTING_FORCE) {
+ pr_warn("Not loading eMCA, error reporting force-enabled through EDAC.\n");
+ return -EPERM;
+ }
+
+ 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;
+
+ /*
+ * eMCA event report method has higher priority than EDAC method,
+ * unless EDAC event report method is mandatory.
+ */
+ old_edac_report_status = get_edac_report_status();
+ set_edac_report_status(EDAC_REPORTING_DISABLED);
+ 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)
+{
+ set_edac_report_status(old_edac_report_status);
+ 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");
Code Review / kvmfornfv.git / blobdiff