eeb2555779
When CPER records are found the address of the records is stashed in the struct ghes. Once the records have been processed, this address is overwritten with zero so that it won't be processed again without being re-populated by firmware. This goes wrong if a struct ghes can be processed concurrently, as can happen at probe time when an NMI occurs. If the NMI arrives on another CPU, the probing CPU may call ghes_clear_estatus() on the records before the handler had finished with them. Even on the same CPU, once the interrupted handler is resumed, it will call ghes_clear_estatus() on the NMIs records, this memory may have already been re-used by firmware. Avoid this stashing by letting the caller hold the address. A later patch will do away with the use of ghes->flags in the read/clear code too. Signed-off-by: James Morse <james.morse@arm.com> Reviewed-by: Borislav Petkov <bp@suse.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef GHES_H
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#define GHES_H
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#include <acpi/apei.h>
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#include <acpi/hed.h>
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/*
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* One struct ghes is created for each generic hardware error source.
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* It provides the context for APEI hardware error timer/IRQ/SCI/NMI
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* handler.
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*
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* estatus: memory buffer for error status block, allocated during
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* HEST parsing.
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*/
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#define GHES_TO_CLEAR 0x0001
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#define GHES_EXITING 0x0002
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struct ghes {
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union {
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struct acpi_hest_generic *generic;
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struct acpi_hest_generic_v2 *generic_v2;
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};
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struct acpi_hest_generic_status *estatus;
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unsigned long flags;
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union {
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struct list_head list;
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struct timer_list timer;
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unsigned int irq;
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};
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};
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struct ghes_estatus_node {
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struct llist_node llnode;
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struct acpi_hest_generic *generic;
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struct ghes *ghes;
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};
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struct ghes_estatus_cache {
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u32 estatus_len;
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atomic_t count;
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struct acpi_hest_generic *generic;
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unsigned long long time_in;
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struct rcu_head rcu;
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};
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enum {
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GHES_SEV_NO = 0x0,
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GHES_SEV_CORRECTED = 0x1,
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GHES_SEV_RECOVERABLE = 0x2,
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GHES_SEV_PANIC = 0x3,
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};
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int ghes_estatus_pool_init(int num_ghes);
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/* From drivers/edac/ghes_edac.c */
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#ifdef CONFIG_EDAC_GHES
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void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err);
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int ghes_edac_register(struct ghes *ghes, struct device *dev);
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void ghes_edac_unregister(struct ghes *ghes);
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#else
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static inline void ghes_edac_report_mem_error(int sev,
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struct cper_sec_mem_err *mem_err)
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{
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}
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static inline int ghes_edac_register(struct ghes *ghes, struct device *dev)
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{
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return -ENODEV;
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}
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static inline void ghes_edac_unregister(struct ghes *ghes)
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{
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}
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#endif
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static inline int acpi_hest_get_version(struct acpi_hest_generic_data *gdata)
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{
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return gdata->revision >> 8;
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}
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static inline void *acpi_hest_get_payload(struct acpi_hest_generic_data *gdata)
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{
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if (acpi_hest_get_version(gdata) >= 3)
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return (void *)(((struct acpi_hest_generic_data_v300 *)(gdata)) + 1);
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return gdata + 1;
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}
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static inline int acpi_hest_get_error_length(struct acpi_hest_generic_data *gdata)
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{
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return ((struct acpi_hest_generic_data *)(gdata))->error_data_length;
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}
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static inline int acpi_hest_get_size(struct acpi_hest_generic_data *gdata)
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{
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if (acpi_hest_get_version(gdata) >= 3)
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return sizeof(struct acpi_hest_generic_data_v300);
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return sizeof(struct acpi_hest_generic_data);
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}
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static inline int acpi_hest_get_record_size(struct acpi_hest_generic_data *gdata)
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{
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return (acpi_hest_get_size(gdata) + acpi_hest_get_error_length(gdata));
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}
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static inline void *acpi_hest_get_next(struct acpi_hest_generic_data *gdata)
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{
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return (void *)(gdata) + acpi_hest_get_record_size(gdata);
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}
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#define apei_estatus_for_each_section(estatus, section) \
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for (section = (struct acpi_hest_generic_data *)(estatus + 1); \
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(void *)section - (void *)(estatus + 1) < estatus->data_length; \
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section = acpi_hest_get_next(section))
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#ifdef CONFIG_ACPI_APEI_SEA
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int ghes_notify_sea(void);
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#else
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static inline int ghes_notify_sea(void) { return -ENOENT; }
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#endif
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#endif /* GHES_H */
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