x86/MCE/AMD: Add support for new MCA_SYND{1,2} registers

Starting with Zen4, AMD's Scalable MCA systems incorporate two new registers:
MCA_SYND1 and MCA_SYND2.

These registers will include supplemental error information in addition to the
existing MCA_SYND register. The data within these registers is considered
valid if MCA_STATUS[SyndV] is set.

Userspace error decoding tools like rasdaemon gather related hardware error
information through the tracepoints.

Therefore, export these two registers through the mce_record tracepoint so
that tools like rasdaemon can parse them and output the supplemental error
information like FRU text contained in them.

  [ bp: Massage. ]

Signed-off-by: Yazen Ghannam <[email protected]>
Signed-off-by: Avadhut Naik <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Reviewed-by: Qiuxu Zhuo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Avadhut Naik

arch/x86/include/asm/mce.h

@@ -122,6 +122,9 @@
 #define MSR_AMD64_SMCA_MC0_DESTAT	0xc0002008
 #define MSR_AMD64_SMCA_MC0_DEADDR	0xc0002009
 #define MSR_AMD64_SMCA_MC0_MISC1	0xc000200a
+/* Registers MISC2 to MISC4 are at offsets B to D. */
+#define MSR_AMD64_SMCA_MC0_SYND1	0xc000200e
+#define MSR_AMD64_SMCA_MC0_SYND2	0xc000200f
 #define MSR_AMD64_SMCA_MCx_CTL(x)	(MSR_AMD64_SMCA_MC0_CTL + 0x10*(x))
 #define MSR_AMD64_SMCA_MCx_STATUS(x)	(MSR_AMD64_SMCA_MC0_STATUS + 0x10*(x))
 #define MSR_AMD64_SMCA_MCx_ADDR(x)	(MSR_AMD64_SMCA_MC0_ADDR + 0x10*(x))
@@ -132,6 +135,8 @@
 #define MSR_AMD64_SMCA_MCx_DESTAT(x)	(MSR_AMD64_SMCA_MC0_DESTAT + 0x10*(x))
 #define MSR_AMD64_SMCA_MCx_DEADDR(x)	(MSR_AMD64_SMCA_MC0_DEADDR + 0x10*(x))
 #define MSR_AMD64_SMCA_MCx_MISCy(x, y)	((MSR_AMD64_SMCA_MC0_MISC1 + y) + (0x10*(x)))
+#define MSR_AMD64_SMCA_MCx_SYND1(x)	(MSR_AMD64_SMCA_MC0_SYND1 + 0x10*(x))
+#define MSR_AMD64_SMCA_MCx_SYND2(x)	(MSR_AMD64_SMCA_MC0_SYND2 + 0x10*(x))
 
 #define XEC(x, mask)			(((x) >> 16) & mask)
 
@@ -190,9 +195,25 @@ enum mce_notifier_prios {
 /**
  * struct mce_hw_err - Hardware Error Record.
  * @m:		Machine Check record.
+ * @vendor:	Vendor-specific error information.
+ *
+ * Vendor-specific fields should not be added to struct mce. Instead, vendors
+ * should export their vendor-specific data through their structure in the
+ * vendor union below.
+ *
+ * AMD's vendor data is parsed by error decoding tools for supplemental error
+ * information. Thus, current offsets of existing fields must be maintained.
+ * Only add new fields at the end of AMD's vendor structure.
  */
 struct mce_hw_err {
 	struct mce m;
+
+	union vendor_info {
+		struct {
+			u64 synd1;		/* MCA_SYND1 MSR */
+			u64 synd2;		/* MCA_SYND2 MSR */
+		} amd;
+	} vendor;
 };
 
 #define	to_mce_hw_err(mce) container_of(mce, struct mce_hw_err, m)

arch/x86/include/uapi/asm/mce.h

@@ -8,7 +8,8 @@
 /*
  * Fields are zero when not available. Also, this struct is shared with
  * userspace mcelog and thus must keep existing fields at current offsets.
- * Only add new fields to the end of the structure
+ * Only add new, shared fields to the end of the structure.
+ * Do not add vendor-specific fields.
  */
 struct mce {
 	__u64 status;		/* Bank's MCi_STATUS MSR */

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

@@ -797,8 +797,11 @@ static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc)
 	if (mce_flags.smca) {
 		rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m->ipid);
 
-		if (m->status & MCI_STATUS_SYNDV)
+		if (m->status & MCI_STATUS_SYNDV) {
 			rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m->synd);
+			rdmsrl(MSR_AMD64_SMCA_MCx_SYND1(bank), err.vendor.amd.synd1);
+			rdmsrl(MSR_AMD64_SMCA_MCx_SYND2(bank), err.vendor.amd.synd2);
+		}
 	}
 
 	mce_log(&err);

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

@@ -202,6 +202,10 @@ static void __print_mce(struct mce_hw_err *err)
 	if (mce_flags.smca) {
 		if (m->synd)
 			pr_cont("SYND %llx ", m->synd);
+		if (err->vendor.amd.synd1)
+			pr_cont("SYND1 %llx ", err->vendor.amd.synd1);
+		if (err->vendor.amd.synd2)
+			pr_cont("SYND2 %llx ", err->vendor.amd.synd2);
 		if (m->ipid)
 			pr_cont("IPID %llx ", m->ipid);
 	}
@@ -678,8 +682,11 @@ static noinstr void mce_read_aux(struct mce_hw_err *err, int i)
 	if (mce_flags.smca) {
 		m->ipid = mce_rdmsrl(MSR_AMD64_SMCA_MCx_IPID(i));
 
-		if (m->status & MCI_STATUS_SYNDV)
+		if (m->status & MCI_STATUS_SYNDV) {
 			m->synd = mce_rdmsrl(MSR_AMD64_SMCA_MCx_SYND(i));
+			err->vendor.amd.synd1 = mce_rdmsrl(MSR_AMD64_SMCA_MCx_SYND1(i));
+			err->vendor.amd.synd2 = mce_rdmsrl(MSR_AMD64_SMCA_MCx_SYND2(i));
+		}
 	}
 }
 

drivers/edac/mce_amd.c

@@ -793,6 +793,7 @@ static int
 amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
 {
 	struct mce *m = (struct mce *)data;
+	struct mce_hw_err *err = to_mce_hw_err(m);
 	unsigned int fam = x86_family(m->cpuid);
 	int ecc;
 
@@ -850,8 +851,11 @@ amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
 	if (boot_cpu_has(X86_FEATURE_SMCA)) {
 		pr_emerg(HW_ERR "IPID: 0x%016llx", m->ipid);
 
-		if (m->status & MCI_STATUS_SYNDV)
-			pr_cont(", Syndrome: 0x%016llx", m->synd);
+		if (m->status & MCI_STATUS_SYNDV) {
+			pr_cont(", Syndrome: 0x%016llx\n", m->synd);
+			pr_emerg(HW_ERR "Syndrome1: 0x%016llx, Syndrome2: 0x%016llx",
+				 err->vendor.amd.synd1, err->vendor.amd.synd2);
+		}
 
 		pr_cont("\n");
 

include/trace/events/mce.h

@@ -43,6 +43,7 @@ TRACE_EVENT(mce_record,
 		__field(	u8,		bank		)
 		__field(	u8,		cpuvendor	)
 		__field(	u32,		microcode	)
+		__dynamic_array(u8, v_data, sizeof(err->vendor))
 	),
 
 	TP_fast_assign(
@@ -65,9 +66,10 @@ TRACE_EVENT(mce_record,
 		__entry->bank		= err->m.bank;
 		__entry->cpuvendor	= err->m.cpuvendor;
 		__entry->microcode	= err->m.microcode;
+		memcpy(__get_dynamic_array(v_data), &err->vendor, sizeof(err->vendor));
 	),
 
-	TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016Lx, IPID: %016Lx, ADDR: %016Lx, MISC: %016Lx, SYND: %016Lx, RIP: %02x:<%016Lx>, TSC: %llx, PPIN: %llx, vendor: %u, CPUID: %x, time: %llu, socket: %u, APIC: %x, microcode: %x",
+	TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016llx, IPID: %016llx, ADDR: %016llx, MISC: %016llx, SYND: %016llx, RIP: %02x:<%016llx>, TSC: %llx, PPIN: %llx, vendor: %u, CPUID: %x, time: %llu, socket: %u, APIC: %x, microcode: %x, vendor data: %s",
 		__entry->cpu,
 		__entry->mcgcap, __entry->mcgstatus,
 		__entry->bank, __entry->status,
@@ -83,7 +85,8 @@ TRACE_EVENT(mce_record,
 		__entry->walltime,
 		__entry->socketid,
 		__entry->apicid,
-		__entry->microcode)
+		__entry->microcode,
+		__print_dynamic_array(v_data, sizeof(u8)))
 );
 
 #endif /* _TRACE_MCE_H */