[PATCH v3 1/2] efi/cper: add cper_mem_err_status_str to decode error description

[Shuai Xue]

Introduce a new helper function cper_mem_err_status_str() which is used to
decode the description of error status, and the cper_print_mem() will call
it and report the details of error status.

Signed-off-by: Shuai Xue <xueshuai@xxxxxxxxxxxxxxxxx>
---
 drivers/firmware/efi/cper.c | 46 ++++++++++++++++++++++++++++++++++++-
 include/linux/cper.h        |  1 +
 2 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 6ec8edec6329..addafccecd84 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -211,6 +211,49 @@ const char *cper_mem_err_type_str(unsigned int etype)
 }
 EXPORT_SYMBOL_GPL(cper_mem_err_type_str);
 
+const char *cper_mem_err_status_str(u64 status)
+{
+	switch ((status >> 8) & 0xff) {
+	case 1:
+		return "Error detected internal to the component";
+	case 16:
+		return "Error detected in the bus";
+	case 4:
+		return "Storage error in DRAM memory";
+	case 5:
+		return "Storage error in TLB";
+	case 6:
+		return "Storage error in cache";
+	case 7:
+		return "Error in one or more functional units";
+	case 8:
+		return "component failed self test";
+	case 9:
+		return "Overflow or undervalue of internal queue";
+	case 17:
+		return "Virtual address not found on IO-TLB or IO-PDIR";
+	case 18:
+		return "Improper access error";
+	case 19:
+		return "Access to a memory address which is not mapped to any component";
+	case 20:
+		return "Loss of Lockstep";
+	case 21:
+		return "Response not associated with a request";
+	case 22:
+		return "Bus parity error - must also set the A, C, or D Bits";
+	case 23:
+		return "Detection of a PATH_ERROR ";
+	case 25:
+		return "Bus operation timeout";
+	case 26:
+		return "A read was issued to data that has been poisoned";
+	default:
+		return "reserved";
+	}
+}
+EXPORT_SYMBOL_GPL(cper_mem_err_status_str);
+
 static int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg)
 {
 	u32 len, n;
@@ -334,7 +377,8 @@ static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem,
 		return;
 	}
 	if (mem->validation_bits & CPER_MEM_VALID_ERROR_STATUS)
-		printk("%s""error_status: 0x%016llx\n", pfx, mem->error_status);
+		printk("%s""error_status: 0x%016llx, %s\n", pfx, mem->error_status,
+				cper_mem_err_status_str(mem->error_status));
 	if (mem->validation_bits & CPER_MEM_VALID_PA)
 		printk("%s""physical_address: 0x%016llx\n",
 		       pfx, mem->physical_addr);
diff --git a/include/linux/cper.h b/include/linux/cper.h
index 6a511a1078ca..5b1dd27b317d 100644
--- a/include/linux/cper.h
+++ b/include/linux/cper.h
@@ -558,6 +558,7 @@ extern const char *const cper_proc_error_type_strs[4];
 u64 cper_next_record_id(void);
 const char *cper_severity_str(unsigned int);
 const char *cper_mem_err_type_str(unsigned int);
+const char *cper_mem_err_status_str(u64 status);
 void cper_print_bits(const char *prefix, unsigned int bits,
 		     const char * const strs[], unsigned int strs_size);
 void cper_mem_err_pack(const struct cper_sec_mem_err *,
-- 
2.20.1.12.g72788fdb