@@ -713,40 +713,32 @@ static void ghes_print_queued_estatus(void)
}
}
-/* Save estatus for further processing in IRQ context */
-static void __process_error(struct ghes *ghes,
- struct acpi_hest_generic_status *ghes_estatus)
+static int _in_nmi_notify_one(struct ghes *ghes, int fixmap_idx)
{
+ int sev, rc = 0;
u32 len, node_len;
+ phys_addr_t buf_paddr;
struct ghes_estatus_node *estatus_node;
struct acpi_hest_generic_status *estatus;
- if (ghes_estatus_cached(ghes_estatus))
- return;
+ rc = ghes_peek_estatus(ghes, fixmap_idx, &buf_paddr, &len);
+ if (rc)
+ return rc;
- len = cper_estatus_len(ghes_estatus);
node_len = GHES_ESTATUS_NODE_LEN(len);
estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool, node_len);
if (!estatus_node)
- return;
+ return -ENOMEM;
estatus_node->ghes = ghes;
estatus_node->generic = ghes->generic;
estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
- memcpy(estatus, ghes_estatus, len);
- llist_add(&estatus_node->llnode, &ghes_estatus_llist);
-}
-
-static int _in_nmi_notify_one(struct ghes *ghes, int fixmap_idx)
-{
- int sev;
- phys_addr_t buf_paddr;
- struct acpi_hest_generic_status *estatus = ghes->estatus;
- if (ghes_read_estatus(ghes, estatus, &buf_paddr, fixmap_idx)) {
+ if (__ghes_read_estatus(estatus, buf_paddr, len, fixmap_idx)) {
ghes_clear_estatus(estatus, buf_paddr, fixmap_idx);
- return -ENOENT;
+ rc = -ENOENT;
+ goto no_work;
}
sev = ghes_severity(estatus->error_severity);
@@ -755,13 +747,20 @@ static int _in_nmi_notify_one(struct ghes *ghes, int fixmap_idx)
__ghes_panic(ghes, estatus);
}
- if (!buf_paddr)
- return 0;
-
- __process_error(ghes, estatus);
ghes_clear_estatus(estatus, buf_paddr, fixmap_idx);
- return 0;
+ if (!buf_paddr || ghes_estatus_cached(estatus))
+ goto no_work;
+
+ llist_add(&estatus_node->llnode, &ghes_estatus_llist);
+
+ return rc;
+
+no_work:
+ gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
+ node_len);
+
+ return rc;
}
static int ghes_estatus_queue_notified(struct list_head *rcu_list,
Each struct ghes has an worst-case sized buffer for storing the estatus. If an error is being processed by ghes_proc() in process context this buffer will be in use. If the error source then triggers an NMI-like notification, the same buffer will be used by _in_nmi_notify_one() to stage the estatus data, before __process_error() copys it into a queued estatus entry. Merge __process_error()s work into _in_nmi_notify_one() so that the queued estatus entry is used from the beginning. Use the new ghes_peek_estatus() so we know how much memory to allocate from the ghes_estatus_pool before we read the records. Reported-by: Borislav Petkov <bp@suse.de> Signed-off-by: James Morse <james.morse@arm.com> --- drivers/acpi/apei/ghes.c | 45 ++++++++++++++++++++-------------------- 1 file changed, 22 insertions(+), 23 deletions(-)