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authorChen Gong <gong.chen@linux.intel.com>2012-03-15 16:53:36 +0800
committerLen Brown <len.brown@intel.com>2012-03-30 03:30:18 -0400
commitee49089dc7d9fc78db51e18f4fba68e88edc49a4 (patch)
tree998a8223c8f1457d5d1c9146d6602cb24c810688 /drivers/acpi/apei
parent185210cc754754c2504afcef9d1c9cd4b8761a9c (diff)
downloadlinux-ee49089dc7d9fc78db51e18f4fba68e88edc49a4.tar.bz2
ACPI, APEI, EINJ, new parameter to control trigger action
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 enable this switch. v2: notrigger should be created together with param1/param2 Tested-by: Tony Luck <tony.luck@lintel.com> Signed-off-by: Chen Gong <gong.chen@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/apei')
-rw-r--r--drivers/acpi/apei/einj.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index 3d3816f6d367..8e1793649ec0 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;
@@ -700,6 +704,11 @@ static int __init einj_init(void)
einj_debug_dir, &error_param2);
if (!fentry)
goto err_unmap;
+
+ fentry = debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
+ einj_debug_dir, &notrigger);
+ if (!fentry)
+ goto err_unmap;
}
if (vendor_dev[0]) {