x86/mce/AMD: Log Deferred Errors using SMCA MCA_DE{STAT,ADDR} registers

Scalable MCA provides new registers for all banks for logging deferred
errors: MCA_DESTAT and MCA_DEADDR. Deferred errors are always logged to
these registers.

Update the AMD deferred error handler to use these registers, if
available.

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@amd.com>
[ Sanity-check __log_error() args, massage a bit. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Aravind Gopalakrishnan <aravindksg.lkml@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1462971509-3856-2-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/mce.h

@@ -110,13 +110,17 @@
 #define MSR_AMD64_SMCA_MC0_MISC0	0xc0002003
 #define MSR_AMD64_SMCA_MC0_CONFIG	0xc0002004
 #define MSR_AMD64_SMCA_MC0_IPID		0xc0002005
+#define MSR_AMD64_SMCA_MC0_DESTAT	0xc0002008
+#define MSR_AMD64_SMCA_MC0_DEADDR	0xc0002009
 #define MSR_AMD64_SMCA_MC0_MISC1	0xc000200a
 #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))
 #define MSR_AMD64_SMCA_MCx_MISC(x)	(MSR_AMD64_SMCA_MC0_MISC0 + 0x10*(x))
 #define MSR_AMD64_SMCA_MCx_CONFIG(x)	(MSR_AMD64_SMCA_MC0_CONFIG + 0x10*(x))
 #define MSR_AMD64_SMCA_MCx_IPID(x)	(MSR_AMD64_SMCA_MC0_IPID + 0x10*(x))
+#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)))
 
 /*

arch/x86/kernel/cpu/mcheck/mce_amd.c

@@ -430,12 +430,23 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
 		deferred_error_interrupt_enable(c);
 }
 
-static void __log_error(unsigned int bank, bool threshold_err, u64 misc)
+static void
+__log_error(unsigned int bank, bool deferred_err, bool threshold_err, u64 misc)
 {
+	u32 msr_status = msr_ops.status(bank);
+	u32 msr_addr = msr_ops.addr(bank);
 	struct mce m;
 	u64 status;
 
-	rdmsrl(msr_ops.status(bank), status);
+	WARN_ON_ONCE(deferred_err && threshold_err);
+
+	if (deferred_err && mce_flags.smca) {
+		msr_status = MSR_AMD64_SMCA_MCx_DESTAT(bank);
+		msr_addr = MSR_AMD64_SMCA_MCx_DEADDR(bank);
+	}
+
+	rdmsrl(msr_status, status);
+
 	if (!(status & MCI_STATUS_VAL))
 		return;
 
@@ -448,10 +459,11 @@ static void __log_error(unsigned int bank, bool threshold_err, u64 misc)
 		m.misc = misc;
 
 	if (m.status & MCI_STATUS_ADDRV)
-		rdmsrl(msr_ops.addr(bank), m.addr);
+		rdmsrl(msr_addr, m.addr);
 
 	mce_log(&m);
-	wrmsrl(msr_ops.status(bank), 0);
+
+	wrmsrl(msr_status, 0);
 }
 
 static inline void __smp_deferred_error_interrupt(void)
@@ -479,17 +491,21 @@ asmlinkage __visible void smp_trace_deferred_error_interrupt(void)
 /* APIC interrupt handler for deferred errors */
 static void amd_deferred_error_interrupt(void)
 {
-	u64 status;
 	unsigned int bank;
+	u32 msr_status;
+	u64 status;
 
 	for (bank = 0; bank < mca_cfg.banks; ++bank) {
-		rdmsrl(msr_ops.status(bank), status);
+		msr_status = (mce_flags.smca) ? MSR_AMD64_SMCA_MCx_DESTAT(bank)
+					      : msr_ops.status(bank);
+
+		rdmsrl(msr_status, status);
 
 		if (!(status & MCI_STATUS_VAL) ||
 		    !(status & MCI_STATUS_DEFERRED))
 			continue;
 
-		__log_error(bank, false, 0);
+		__log_error(bank, true, false, 0);
 		break;
 	}
 }
@@ -544,7 +560,7 @@ static void amd_threshold_interrupt(void)
 	return;
 
 log:
-	__log_error(bank, true, ((u64)high << 32) | low);
+	__log_error(bank, false, true, ((u64)high << 32) | low);
 }
 
 /*