[PATCH v2 14/16] x86/mce, EDAC/mce_amd: Add support for new MCA_SYND{1,2} registers

[Yazen Ghannam <yazen.ghannam@amd.com>]

From: Avadhut Naik <Avadhut.Naik@amd.com>

AMD's Scalable MCA systems viz. Genoa will include 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 the registers is
considered valid if MCA_STATUS[SyndV] is set.

Add fields for these registers as vendor-specific error information
in struct mce_hw_err. Save and print these registers wherever
MCA_STATUS[SyndV]/MCA_SYND is currently used.

Also, modify the mce_record tracepoint to export these new registers
through __dynamic_array. While the sizeof() operator has been used to
determine the size of this __dynamic_array, the same, if needed in the
future can be substituted by caching the size of vendor-specific error
information as part of struct mce_hw_err.

Signed-off-by: Avadhut Naik <Avadhut.Naik@amd.com>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---

Notes:
    Link:
    https://lkml.kernel.org/r/20231118193248.1296798-19-yazen.ghannam@amd.com
    
    v1->v2:
    * Rebase on upstream changes for MCE trace event. (Avadhut)

 arch/x86/include/asm/mce.h     | 12 ++++++++++++
 arch/x86/kernel/cpu/mce/core.c | 26 ++++++++++++++++++--------
 drivers/edac/mce_amd.c         | 10 +++++++---
 include/trace/events/mce.h     |  9 +++++++--
 4 files changed, 44 insertions(+), 13 deletions(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index e4ad9807b3e3..a701290f80a1 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -118,6 +118,9 @@
 #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))
@@ -128,6 +131,8 @@
 #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)
 
@@ -185,6 +190,13 @@ enum mce_notifier_prios {
 
 struct mce_hw_err {
 	struct mce m;
+
+	union vendor_info {
+		struct {
+			u64 synd1;
+			u64 synd2;
+		} amd;
+	} vi;
 };
 
 struct notifier_block;
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index fef025bda2af..aa27729f7899 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -201,6 +201,10 @@ static void __print_mce(struct mce_hw_err *err)
 	if (mce_flags.smca) {
 		if (m->synd)
 			pr_cont("SYND %llx ", m->synd);
+		if (err->vi.amd.synd1)
+			pr_cont("SYND1 %llx ", err->vi.amd.synd1);
+		if (err->vi.amd.synd2)
+			pr_cont("SYND2 %llx ", err->vi.amd.synd2);
 		if (m->ipid)
 			pr_cont("IPID %llx ", m->ipid);
 	}
@@ -651,8 +655,10 @@ static struct notifier_block mce_default_nb = {
 /*
  * Read ADDR and MISC registers.
  */
-static noinstr void mce_read_aux(struct mce *m, int i)
+static noinstr void mce_read_aux(struct mce_hw_err *err, int i)
 {
+	struct mce *m = &err->m;
+
 	if (m->status & MCI_STATUS_MISCV)
 		m->misc = mce_rdmsrl(mca_msr_reg(i, MCA_MISC));
 
@@ -674,8 +680,11 @@ static noinstr void mce_read_aux(struct mce *m, 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->vi.amd.synd1 = mce_rdmsrl(MSR_AMD64_SMCA_MCx_SYND1(i));
+			err->vi.amd.synd2 = mce_rdmsrl(MSR_AMD64_SMCA_MCx_SYND2(i));
+		}
 	}
 }
 
@@ -751,7 +760,7 @@ bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 		/* If this entry is not valid, ignore it */
 		if (!(m->status & MCI_STATUS_VAL)) {
 			if (smca_destat_is_valid(i)) {
-				mce_read_aux(m, i);
+				mce_read_aux(&err, i);
 				goto clear_it;
 			}
 
@@ -801,7 +810,7 @@ bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 		if (flags & MCP_DONTLOG)
 			goto clear_it;
 
-		mce_read_aux(m, i);
+		mce_read_aux(&err, i);
 		m->severity = mce_severity(m, NULL, NULL, false);
 
 		/*
@@ -943,9 +952,10 @@ static __always_inline void quirk_zen_ifu(int bank, struct mce *m, struct pt_reg
  * Do a quick check if any of the events requires a panic.
  * This decides if we keep the events around or clear them.
  */
-static __always_inline int mce_no_way_out(struct mce *m, char **msg, unsigned long *validp,
+static __always_inline int mce_no_way_out(struct mce_hw_err *err, char **msg, unsigned long *validp,
 					  struct pt_regs *regs)
 {
+	struct mce *m = &err->m;
 	char *tmp = *msg;
 	int i;
 
@@ -963,7 +973,7 @@ static __always_inline int mce_no_way_out(struct mce *m, char **msg, unsigned lo
 
 		m->bank = i;
 		if (mce_severity(m, regs, &tmp, true) >= MCE_PANIC_SEVERITY) {
-			mce_read_aux(m, i);
+			mce_read_aux(err, i);
 			*msg = tmp;
 			return 1;
 		}
@@ -1361,7 +1371,7 @@ __mc_scan_banks(struct mce_hw_err *err, struct pt_regs *regs, struct mce *final,
 		if (severity == MCE_NO_SEVERITY)
 			continue;
 
-		mce_read_aux(m, i);
+		mce_read_aux(err, i);
 
 		/* assuming valid severity level != 0 */
 		m->severity = severity;
@@ -1562,7 +1572,7 @@ noinstr void do_machine_check(struct pt_regs *regs)
 	final = this_cpu_ptr(&hw_errs_seen);
 	final->m = *m;
 
-	no_way_out = mce_no_way_out(m, &msg, valid_banks, regs);
+	no_way_out = mce_no_way_out(&err, &msg, valid_banks, regs);
 
 	barrier();
 
diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index e02af5da1ec2..32bf4cc564a3 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -792,7 +792,8 @@ static const char *decode_error_status(struct mce *m)
 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 = (struct mce_hw_err *)data;
+	struct mce *m = &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->vi.amd.synd1, err->vi.amd.synd2);
+		}
 
 		pr_cont("\n");
 
diff --git a/include/trace/events/mce.h b/include/trace/events/mce.h
index 65aba1afcd07..43e8ecc11881 100644
--- a/include/trace/events/mce.h
+++ b/include/trace/events/mce.h
@@ -43,6 +43,8 @@ TRACE_EVENT(mce_record,
 		__field(	u8,		bank		)
 		__field(	u8,		cpuvendor	)
 		__field(	u32,		microcode	)
+		__field(	u8,		len		)
+		__dynamic_array(u8, v_data, sizeof(err->vi))
 	),
 
 	TP_fast_assign(
@@ -65,9 +67,11 @@ TRACE_EVENT(mce_record,
 		__entry->bank		= err->m.bank;
 		__entry->cpuvendor	= err->m.cpuvendor;
 		__entry->microcode	= err->m.microcode;
+		__entry->len		= sizeof(err->vi);
+		memcpy(__get_dynamic_array(v_data), &err->vi, sizeof(err->vi));
 	),
 
-	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 +87,8 @@ TRACE_EVENT(mce_record,
 		__entry->walltime,
 		__entry->socketid,
 		__entry->apicid,
-		__entry->microcode)
+		__entry->microcode,
+		__print_array(__get_dynamic_array(v_data), __entry->len / 8, 8))
 );
 
 #endif /* _TRACE_MCE_H */
-- 
2.34.1