efi/cper: Add a cper_mem_err_status_str() to decode error description

Introduce a new helper function cper_mem_err_status_str() to decode the
error status value into a human readable string.

  [ bp: Massage. ]

Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20220308144053.49090-2-xueshuai@linux.alibaba.com

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 6ec8edec63296b435389531bbc567d8703125201..34eeaa59f04a37f43be58d54eb6865f1d46244ca 100644 (file)
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -211,6 +211,32 @@ 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  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 16:        return "Error detected in the bus";
+       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 protocol error";
+       case 24:        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 +360,9 @@ 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: %s (0x%016llx)\n",
+                      pfx, cper_mem_err_status_str(mem->error_status),
+                      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 6a511a1078ca069c4fa0e120b781c4203571afc8..5b1dd27b317d589f4af0f9b7555a05a7d28a72f1 100644 (file)
--- 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 *,