@@ -33,6 +33,7 @@
#include <linux/irq_work.h>
#include <linux/llist.h>
#include <linux/genalloc.h>
+#include <linux/kfifo.h>
#include <linux/pci.h>
#include <linux/pfn.h>
#include <linux/aer.h>
@@ -64,6 +65,7 @@
#define GHES_ESTATUS_CACHES_SIZE 4
#define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
+
/* Prevent too many caches are allocated because of RCU */
#define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
@@ -88,6 +90,10 @@
#define FIX_APEI_GHES_SDEI_CRITICAL __end_of_fixed_addresses
#endif
+#define GHES_EVENT_RING_SIZE 256
+#define GHES_EVENT_GDATA_POOL_MIN_ALLOC_ORDER 3
+#define GHES_EVENT_GDATA_POOL_MIN_SIZE 65536
+
static inline bool is_hest_type_generic_v2(struct ghes *ghes)
{
return ghes->generic->header.type == ACPI_HEST_TYPE_GENERIC_ERROR_V2;
@@ -123,6 +129,19 @@ static DEFINE_MUTEX(ghes_list_mutex);
*/
static DEFINE_SPINLOCK(ghes_notify_lock_irq);
+struct ghes_event_entry {
+ struct acpi_hest_generic_data *gdata;
+ int error_severity;
+};
+
+static DEFINE_KFIFO(ghes_event_ring, struct ghes_event_entry,
+ GHES_EVENT_RING_SIZE);
+
+static DEFINE_SPINLOCK(ghes_event_ring_lock);
+
+static struct gen_pool *ghes_event_gdata_pool;
+static unsigned long ghes_event_gdata_pool_size_request;
+
static struct gen_pool *ghes_estatus_pool;
static unsigned long ghes_estatus_pool_size_request;
@@ -183,6 +202,38 @@ int ghes_estatus_pool_init(int num_ghes)
return -ENOMEM;
}
+static int ghes_event_gdata_pool_init(void)
+{
+ unsigned long addr, len;
+ int rc;
+
+ ghes_event_gdata_pool = gen_pool_create(GHES_EVENT_GDATA_POOL_MIN_ALLOC_ORDER, -1);
+ if (!ghes_event_gdata_pool)
+ return -ENOMEM;
+
+ if (ghes_event_gdata_pool_size_request < GHES_EVENT_GDATA_POOL_MIN_SIZE)
+ ghes_event_gdata_pool_size_request = GHES_EVENT_GDATA_POOL_MIN_SIZE;
+
+ len = ghes_event_gdata_pool_size_request;
+ addr = (unsigned long)vmalloc(PAGE_ALIGN(len));
+ if (!addr)
+ goto err_pool_alloc;
+
+ rc = gen_pool_add(ghes_event_gdata_pool, addr, PAGE_ALIGN(len), -1);
+ if (rc)
+ goto err_pool_add;
+
+ return 0;
+
+err_pool_add:
+ vfree((void *)addr);
+
+err_pool_alloc:
+ gen_pool_destroy(ghes_event_gdata_pool);
+
+ return -ENOMEM;
+}
+
static int map_gen_v2(struct ghes *ghes)
{
return apei_map_generic_address(&ghes->generic_v2->read_ack_register);
@@ -242,6 +293,10 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
goto err_unmap_status_addr;
}
+ ghes_event_gdata_pool_size_request += generic->records_to_preallocate *
+ generic->max_sections_per_record *
+ generic->max_raw_data_length;
+
return ghes;
err_unmap_status_addr:
@@ -511,6 +566,69 @@ static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
#endif
}
+static BLOCKING_NOTIFIER_HEAD(ghes_event_notify_list);
+
+/**
+ * ghes_register_event_notifier - register an event notifier
+ * for the non-fatal HW errors.Presently supported to notify
+ * the vendor-specific HW errors only, though it can be used to
+ * notify the standard errors also.
+ * @nb: pointer to the notifier_block structure of the event handler.
+ *
+ * return 0 : SUCCESS, non-zero : FAIL
+ */
+int ghes_register_event_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&ghes_event_notify_list, nb);
+}
+EXPORT_SYMBOL_GPL(ghes_register_event_notifier);
+
+/**
+ * ghes_unregister_event_notifier - unregister the previously
+ * registered event notifier.
+ * @nb: pointer to the notifier_block structure of the event handler.
+ */
+void ghes_unregister_event_notifier(struct notifier_block *nb)
+{
+ blocking_notifier_chain_unregister(&ghes_event_notify_list, nb);
+}
+EXPORT_SYMBOL_GPL(ghes_unregister_event_notifier);
+
+static void ghes_event_work_func(struct work_struct *work)
+{
+ struct ghes_event_entry entry;
+ u32 len;
+
+ while (kfifo_get(&ghes_event_ring, &entry)) {
+ blocking_notifier_call_chain(&ghes_event_notify_list,
+ entry.error_severity,
+ entry.gdata);
+ len = acpi_hest_get_record_size(entry.gdata);
+ gen_pool_free(ghes_event_gdata_pool, (unsigned long)entry.gdata, len);
+ }
+}
+
+static DECLARE_WORK(ghes_event_work, ghes_event_work_func);
+
+static void ghes_handle_non_standard_event(struct acpi_hest_generic_data *gdata,
+ int sev)
+{
+ u32 len;
+ struct ghes_event_entry event_entry;
+
+ len = acpi_hest_get_record_size(gdata);
+ event_entry.gdata = (void *)gen_pool_alloc(ghes_event_gdata_pool, len);
+ if (!event_entry.gdata)
+ return;
+
+ memcpy(event_entry.gdata, gdata, len);
+ event_entry.error_severity = sev;
+ if (kfifo_in_spinlocked(&ghes_event_ring, &event_entry, 1, &ghes_event_ring_lock))
+ schedule_work(&ghes_event_work);
+ else
+ pr_warn(GHES_PFX "event notify queue full\n");
+}
+
static bool ghes_do_proc(struct ghes *ghes,
const struct acpi_hest_generic_status *estatus)
{
@@ -549,6 +667,7 @@ static bool ghes_do_proc(struct ghes *ghes,
} else {
void *err = acpi_hest_get_payload(gdata);
+ ghes_handle_non_standard_event(gdata, sev);
log_non_standard_event(sec_type, fru_id, fru_text,
sec_sev, err,
gdata->error_data_length);
@@ -1385,6 +1504,10 @@ static int __init ghes_init(void)
else
pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
+ rc = ghes_event_gdata_pool_init();
+ if (rc)
+ pr_warn(GHES_PFX "non-fatal vendor-specific errors not being notified\n");
+
return 0;
err:
return rc;
@@ -53,6 +53,35 @@ enum {
GHES_SEV_PANIC = 0x3,
};
+#ifdef CONFIG_ACPI_APEI_GHES
+/**
+ * ghes_register_event_notifier - register an event notifier
+ * for the non-fatal HW errors.Presently supported to notify
+ * the vendor-specific HW errors only, though it can be used to notify
+ * the standard errors also.
+ * @nb: pointer to the notifier_block structure of the event notifier.
+ *
+ * Return : 0 - SUCCESS, non-zero - FAIL.
+ */
+int ghes_register_event_notifier(struct notifier_block *nb);
+
+/**
+ * ghes_unregister_event_notifier - unregister the previously
+ * registered event notifier.
+ * @nb: pointer to the notifier_block structure of the event notifier.
+ */
+void ghes_unregister_event_notifier(struct notifier_block *nb);
+#else
+static inline int ghes_register_event_notifier(struct notifier_block *nb)
+{
+ return -ENODEV;
+}
+
+static inline void ghes_unregister_event_notifier(struct notifier_block *nb)
+{
+}
+#endif
+
int ghes_estatus_pool_init(int num_ghes);
/* From drivers/edac/ghes_edac.c */