include/acpi/ghes.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef GHES_H
   3 #define GHES_H
   4
   5 #include <acpi/apei.h>
   6 #include <acpi/hed.h>
   7
   8 /*
   9  * One struct ghes is created for each generic hardware error source.
  10  * It provides the context for APEI hardware error timer/IRQ/SCI/NMI
  11  * handler.
  12  *
  13  * estatus: memory buffer for error status block, allocated during
  14  * HEST parsing.
  15  */
  16 #define GHES_EXITING            0x0002
  17
  18 struct ghes {
  19         union {
  20                 struct acpi_hest_generic *generic;
  21                 struct acpi_hest_generic_v2 *generic_v2;
  22         };
  23         struct acpi_hest_generic_status *estatus;
  24         unsigned long flags;
  25         union {
  26                 struct list_head list;
  27                 struct timer_list timer;
  28                 unsigned int irq;
  29         };
  30         struct device *dev;
  31         struct list_head elist;
  32 };
  33
  34 struct ghes_estatus_node {
  35         struct llist_node llnode;
  36         struct acpi_hest_generic *generic;
  37         struct ghes *ghes;
  38
  39         int task_work_cpu;
  40         struct callback_head task_work;
  41 };
  42
  43 struct ghes_estatus_cache {
  44         u32 estatus_len;
  45         atomic_t count;
  46         struct acpi_hest_generic *generic;
  47         unsigned long long time_in;
  48         struct rcu_head rcu;
  49 };
  50
  51 enum {
  52         GHES_SEV_NO = 0x0,
  53         GHES_SEV_CORRECTED = 0x1,
  54         GHES_SEV_RECOVERABLE = 0x2,
  55         GHES_SEV_PANIC = 0x3,
  56 };
  57
  58 #ifdef CONFIG_ACPI_APEI_GHES
  59 /**
  60  * ghes_register_vendor_record_notifier - register a notifier for vendor
  61  * records that the kernel would otherwise ignore.
  62  * @nb: pointer to the notifier_block structure of the event handler.
  63  *
  64  * return 0 : SUCCESS, non-zero : FAIL
  65  */
  66 int ghes_register_vendor_record_notifier(struct notifier_block *nb);
  67
  68 /**
  69  * ghes_unregister_vendor_record_notifier - unregister the previously
  70  * registered vendor record notifier.
  71  * @nb: pointer to the notifier_block structure of the vendor record handler.
  72  */
  73 void ghes_unregister_vendor_record_notifier(struct notifier_block *nb);
  74
  75 struct list_head *ghes_get_devices(void);
  76
  77 void ghes_estatus_pool_region_free(unsigned long addr, u32 size);
  78 #else
  79 static inline struct list_head *ghes_get_devices(void) { return NULL; }
  80
  81 static inline void ghes_estatus_pool_region_free(unsigned long addr, u32 size) { return; }
  82 #endif
  83
  84 int ghes_estatus_pool_init(unsigned int num_ghes);
  85
  86 static inline int acpi_hest_get_version(struct acpi_hest_generic_data *gdata)
  87 {
  88         return gdata->revision >> 8;
  89 }
  90
  91 static inline void *acpi_hest_get_payload(struct acpi_hest_generic_data *gdata)
  92 {
  93         if (acpi_hest_get_version(gdata) >= 3)
  94                 return (void *)(((struct acpi_hest_generic_data_v300 *)(gdata)) + 1);
  95
  96         return gdata + 1;
  97 }
  98
  99 static inline int acpi_hest_get_error_length(struct acpi_hest_generic_data *gdata)
 100 {
 101         return ((struct acpi_hest_generic_data *)(gdata))->error_data_length;
 102 }
 103
 104 static inline int acpi_hest_get_size(struct acpi_hest_generic_data *gdata)
 105 {
 106         if (acpi_hest_get_version(gdata) >= 3)
 107                 return sizeof(struct acpi_hest_generic_data_v300);
 108
 109         return sizeof(struct acpi_hest_generic_data);
 110 }
 111
 112 static inline int acpi_hest_get_record_size(struct acpi_hest_generic_data *gdata)
 113 {
 114         return (acpi_hest_get_size(gdata) + acpi_hest_get_error_length(gdata));
 115 }
 116
 117 static inline void *acpi_hest_get_next(struct acpi_hest_generic_data *gdata)
 118 {
 119         return (void *)(gdata) + acpi_hest_get_record_size(gdata);
 120 }
 121
 122 #define apei_estatus_for_each_section(estatus, section)                 \
 123         for (section = (struct acpi_hest_generic_data *)(estatus + 1);  \
 124              (void *)section - (void *)(estatus + 1) < estatus->data_length; \
 125              section = acpi_hest_get_next(section))
 126
 127 #ifdef CONFIG_ACPI_APEI_SEA
 128 int ghes_notify_sea(void);
 129 #else
 130 static inline int ghes_notify_sea(void) { return -ENOENT; }
 131 #endif
 132
 133 struct notifier_block;
 134 extern void ghes_register_report_chain(struct notifier_block *nb);
 135 extern void ghes_unregister_report_chain(struct notifier_block *nb);
 136 #endif /* GHES_H */