[PATCH] ACPI, APEI, EINJ, new parameter to control trigger action

[PATCH] ACPI, APEI, EINJ, new parameter to control trigger action

[Chen Gong]

Some APEI firmware implementation will access injected address
specified in param1 to trigger the error when injecting memory
error, which means if one SRAR error is injected, the crash
always happens because it is executed in kernel context. This
new parameter can disable trigger action and control is taken
over by the user. In this way, an SRAR error can happen in user
context instead of crashing the system. This function is highly
depended on BIOS implementation so please ensure you know the
BIOS trigger procedure before you open this switch.

Tested-by: Tony Luck <tony.luck@lintel.com>
Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
---
 drivers/acpi/apei/einj.c |   14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index 4ca087d..4a3ebb5 100644
--- a/drivers/acpi/apei/einj.c
+++ b/drivers/acpi/apei/einj.c
@@ -74,6 +74,8 @@ struct vendor_error_type_extension {
 	u8	reserved[3];
 };
 
+static u32 notrigger;
+
 static u32 vendor_flags;
 static struct debugfs_blob_wrapper vendor_blob;
 static char vendor_dev[64];
@@ -496,9 +498,11 @@ static int __einj_error_inject(u32 type, u64 param1, u64 param2)
 	if (rc)
 		return rc;
 	trigger_paddr = apei_exec_ctx_get_output(&ctx);
-	rc = __einj_error_trigger(trigger_paddr, type, param1, param2);
-	if (rc)
-		return rc;
+	if (notrigger == 0) {
+		rc = __einj_error_trigger(trigger_paddr, type, param1, param2);
+		if (rc)
+			return rc;
+	}
 	rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION);
 
 	return rc;
@@ -677,6 +681,10 @@ static int __init einj_init(void)
 				     einj_debug_dir, NULL, &error_inject_fops);
 	if (!fentry)
 		goto err_cleanup;
+	fentry = debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
+				    einj_debug_dir, &notrigger);
+	if (!fentry)
+		goto err_cleanup;
 
 	apei_resources_init(&einj_resources);
 	einj_exec_ctx_init(&ctx);
-- 
1.7.8.2.302.g17b4e