x86/MCE/AMD, EDAC/mce_amd: Decode UMC_V2 ECC errors

The MI200 (Aldebaran) series of devices introduced a new SMCA bank type
for Unified Memory Controllers. The MCE subsystem already has support
for this new type. The MCE decoder module will decode the common MCA
error information for the new bank type, but it will not pass the
information to the AMD64 EDAC module for detailed memory error decoding.

Have the MCE decoder module recognize the new bank type as an SMCA UMC
memory error and pass the MCA information to AMD64 EDAC.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Co-developed-by: Muralidhara M K <muralidhara.mk@amd.com>
Signed-off-by: Muralidhara M K <muralidhara.mk@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230515113537.1052146-3-muralimk@amd.com

Author: yghannam

arch/x86/kernel/cpu/mce/amd.c

@@ -715,11 +715,13 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
 
 bool amd_mce_is_memory_error(struct mce *m)
 {
+	enum smca_bank_types bank_type;
 	/* ErrCodeExt[20:16] */
 	u8 xec = (m->status >> 16) & 0x1f;
 
+	bank_type = smca_get_bank_type(m->extcpu, m->bank);
 	if (mce_flags.smca)
-		return smca_get_bank_type(m->extcpu, m->bank) == SMCA_UMC && xec == 0x0;
+		return (bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2) && xec == 0x0;
 
 	return m->bank == 4 && xec == 0x8;
 }
@@ -1050,7 +1052,7 @@ static const char *get_name(unsigned int cpu, unsigned int bank, struct threshol
 	if (bank_type >= N_SMCA_BANK_TYPES)
 		return NULL;
 
-	if (b && bank_type == SMCA_UMC) {
+	if (b && (bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2)) {
 		if (b->block < ARRAY_SIZE(smca_umc_block_names))
 			return smca_umc_block_names[b->block];
 		return NULL;

drivers/edac/mce_amd.c

@@ -1186,7 +1186,8 @@ static void decode_smca_error(struct mce *m)
 	if (xec < smca_mce_descs[bank_type].num_descs)
 		pr_cont(", %s.\n", smca_mce_descs[bank_type].descs[xec]);
 
-	if (bank_type == SMCA_UMC && xec == 0 && decode_dram_ecc)
+	if ((bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2) &&
+	    xec == 0 && decode_dram_ecc)
 		decode_dram_ecc(topology_die_id(m->extcpu), m);
 }