ACPI, APEI, GHES, Support disable GHES at boot time

Some machine may have broken firmware so that GHES and firmware first
mode should be disabled.  This patch adds support to that.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 17 insertions, 8 deletions

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index f339c0f8369c..b142b94bf8b2 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -77,6 +77,9 @@ struct ghes {
         };
 };
 
+int ghes_disable;
+module_param_named(disable, ghes_disable, bool, 0);
+
 static int ghes_panic_timeout   __read_mostly = 30;
 
 /*
@@ -665,6 +668,11 @@ static int __init ghes_init(void)
                 return -EINVAL;
         }
 
+        if (ghes_disable) {
+                pr_info(GHES_PFX "GHES is not enabled!\n");
+                return -EINVAL;
+        }
+
         rc = ghes_ioremap_init();
         if (rc)
                 goto err;
diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index 181bc2f7bb74..05fee06f4d6e 100644
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -231,16 +231,17 @@ void __init acpi_hest_init(void)
                 goto err;
         }
 
-        rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
-        if (rc)
-                goto err;
-
-        rc = hest_ghes_dev_register(ghes_count);
-        if (!rc) {
-                pr_info(HEST_PFX "Table parsing has been initialized.\n");
-                return;
+        if (!ghes_disable) {
+                rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
+                if (rc)
+                        goto err;
+                rc = hest_ghes_dev_register(ghes_count);
+                if (rc)
+                        goto err;
         }
 
+        pr_info(HEST_PFX "Table parsing has been initialized.\n");
+        return;
 err:
         hest_disable = 1;
 }