// SPDX-License-Identifier: GPL-2.0-only /* * APEI Error Record Serialization Table support * * ERST is a way provided by APEI to save and retrieve hardware error * information to and from a persistent store. * * For more information about ERST, please refer to ACPI Specification * version 4.0, section 17.4. * * Copyright 2010 Intel Corp. * Author: Huang Ying <[email protected]> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/io.h> #include <linux/acpi.h> #include <linux/uaccess.h> #include <linux/cper.h> #include <linux/nmi.h> #include <linux/hardirq.h> #include <linux/pstore.h> #include <linux/vmalloc.h> #include <linux/mm.h> /* kvfree() */ #include <acpi/apei.h> #include "apei-internal.h" #undef pr_fmt #define pr_fmt(fmt) … /* ERST command status */ #define ERST_STATUS_SUCCESS … #define ERST_STATUS_NOT_ENOUGH_SPACE … #define ERST_STATUS_HARDWARE_NOT_AVAILABLE … #define ERST_STATUS_FAILED … #define ERST_STATUS_RECORD_STORE_EMPTY … #define ERST_STATUS_RECORD_NOT_FOUND … #define ERST_TAB_ENTRY(tab) … #define SPIN_UNIT … /* Firmware should respond within 1 milliseconds */ #define FIRMWARE_TIMEOUT … #define FIRMWARE_MAX_STALL … int erst_disable; EXPORT_SYMBOL_GPL(…); static struct acpi_table_erst *erst_tab; /* ERST Error Log Address Range attributes */ #define ERST_RANGE_RESERVED … #define ERST_RANGE_NVRAM … #define ERST_RANGE_SLOW … /* ERST Exec max timings */ #define ERST_EXEC_TIMING_MAX_MASK … #define ERST_EXEC_TIMING_MAX_SHIFT … /* * ERST Error Log Address Range, used as buffer for reading/writing * error records. */ static struct erst_erange { … } erst_erange; /* * Prevent ERST interpreter to run simultaneously, because the * corresponding firmware implementation may not work properly when * invoked simultaneously. * * It is used to provide exclusive accessing for ERST Error Log * Address Range too. */ static DEFINE_RAW_SPINLOCK(erst_lock); static inline int erst_errno(int command_status) { … } static inline u64 erst_get_timeout(void) { … } static int erst_timedout(u64 *t, u64 spin_unit) { … } static int erst_exec_load_var1(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_load_var2(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_store_var1(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_add(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_subtract(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_add_value(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_subtract_value(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_stall(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_stall_while_true(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_skip_next_instruction_if_true( struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_goto(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_set_src_address_base(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_set_dst_address_base(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static int erst_exec_move_data(struct apei_exec_context *ctx, struct acpi_whea_header *entry) { … } static struct apei_exec_ins_type erst_ins_type[] = …; static inline void erst_exec_ctx_init(struct apei_exec_context *ctx) { … } static int erst_get_erange(struct erst_erange *range) { … } static ssize_t __erst_get_record_count(void) { … } ssize_t erst_get_record_count(void) { … } EXPORT_SYMBOL_GPL(…); #define ERST_RECORD_ID_CACHE_SIZE_MIN … #define ERST_RECORD_ID_CACHE_SIZE_MAX … struct erst_record_id_cache { … }; static struct erst_record_id_cache erst_record_id_cache = …; static int __erst_get_next_record_id(u64 *record_id) { … } int erst_get_record_id_begin(int *pos) { … } EXPORT_SYMBOL_GPL(…); /* erst_record_id_cache.lock must be held by caller */ static int __erst_record_id_cache_add_one(void) { … } /* * Get the record ID of an existing error record on the persistent * storage. If there is no error record on the persistent storage, the * returned record_id is APEI_ERST_INVALID_RECORD_ID. */ int erst_get_record_id_next(int *pos, u64 *record_id) { … } EXPORT_SYMBOL_GPL(…); /* erst_record_id_cache.lock must be held by caller */ static void __erst_record_id_cache_compact(void) { … } void erst_get_record_id_end(void) { … } EXPORT_SYMBOL_GPL(…); static int __erst_write_to_storage(u64 offset) { … } static int __erst_read_from_storage(u64 record_id, u64 offset) { … } static int __erst_clear_from_storage(u64 record_id) { … } /* NVRAM ERST Error Log Address Range is not supported yet */ static void pr_unimpl_nvram(void) { … } static int __erst_write_to_nvram(const struct cper_record_header *record) { … } static int __erst_read_to_erange_from_nvram(u64 record_id, u64 *offset) { … } static int __erst_clear_from_nvram(u64 record_id) { … } int erst_write(const struct cper_record_header *record) { … } EXPORT_SYMBOL_GPL(…); static int __erst_read_to_erange(u64 record_id, u64 *offset) { … } static ssize_t __erst_read(u64 record_id, struct cper_record_header *record, size_t buflen) { … } /* * If return value > buflen, the buffer size is not big enough, * else if return value < 0, something goes wrong, * else everything is OK, and return value is record length */ ssize_t erst_read(u64 record_id, struct cper_record_header *record, size_t buflen) { … } EXPORT_SYMBOL_GPL(…); static void erst_clear_cache(u64 record_id) { … } ssize_t erst_read_record(u64 record_id, struct cper_record_header *record, size_t buflen, size_t recordlen, const guid_t *creatorid) { … } EXPORT_SYMBOL_GPL(…); int erst_clear(u64 record_id) { … } EXPORT_SYMBOL_GPL(…); static int __init setup_erst_disable(char *str) { … } __setup(…); static int erst_check_table(struct acpi_table_erst *erst_tab) { … } static int erst_open_pstore(struct pstore_info *psi); static int erst_close_pstore(struct pstore_info *psi); static ssize_t erst_reader(struct pstore_record *record); static int erst_writer(struct pstore_record *record); static int erst_clearer(struct pstore_record *record); static struct pstore_info erst_info = …; #define CPER_CREATOR_PSTORE … #define CPER_SECTION_TYPE_DMESG … #define CPER_SECTION_TYPE_DMESG_Z … #define CPER_SECTION_TYPE_MCE … struct cper_pstore_record { … } __packed; static int reader_pos; static int erst_open_pstore(struct pstore_info *psi) { … } static int erst_close_pstore(struct pstore_info *psi) { … } static ssize_t erst_reader(struct pstore_record *record) { … } static int erst_writer(struct pstore_record *record) { … } static int erst_clearer(struct pstore_record *record) { … } static int __init erst_init(void) { … } device_initcall(erst_init);
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