ACPI, APEI, Report GHES error information via printk

printk is one of the methods to report hardware errors to user space.
This patch implements hardware error reporting for GHES via printk.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 21 insertions, 4 deletions

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 0d505e59214d..51905d07a4d9 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -43,6 +43,7 @@
 #include <linux/kdebug.h>
 #include <linux/platform_device.h>
 #include <linux/mutex.h>
+#include <linux/ratelimit.h>
 #include <acpi/apei.h>
 #include <acpi/atomicio.h>
 #include <acpi/hed.h>
@@ -255,11 +256,26 @@ static void ghes_do_proc(struct ghes *ghes)
                 }
 #endif
         }
+}
 
-        if (!processed && printk_ratelimit())
-                pr_warning(GHES_PFX
-                "Unknown error record from generic hardware error source: %d\n",
-                           ghes->generic->header.source_id);
+static void ghes_print_estatus(const char *pfx, struct ghes *ghes)
+{
+        /* Not more than 2 messages every 5 seconds */
+        static DEFINE_RATELIMIT_STATE(ratelimit, 5*HZ, 2);
+
+        if (pfx == NULL) {
+                if (ghes_severity(ghes->estatus->error_severity) <=
+                    GHES_SEV_CORRECTED)
+                        pfx = KERN_WARNING HW_ERR;
+                else
+                        pfx = KERN_ERR HW_ERR;
+        }
+        if (__ratelimit(&ratelimit)) {
+                printk(
+        "%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
+        pfx, ghes->generic->header.source_id);
+                apei_estatus_print(pfx, ghes->estatus);
+        }
 }
 
 static int ghes_proc(struct ghes *ghes)
@@ -269,6 +285,7 @@ static int ghes_proc(struct ghes *ghes)
         rc = ghes_read_estatus(ghes, 0);
         if (rc)
                 goto out;
+        ghes_print_estatus(NULL, ghes);
         ghes_do_proc(ghes);
 
 out: