[PATCH -v2 3/3] ACPI, APEI, report GHES error information via printk

[Huang Ying <ying.huang@intel.com>]

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>
---
 drivers/acpi/apei/ghes.c |   21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -255,11 +255,23 @@ static void ghes_do_proc(struct ghes *gh
 		}
 #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)
+{
+	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 (printk_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 +281,7 @@ 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: