x86/mce: Add support for new MCA_SYND register

Syndrome information is no longer contained in MCA_STATUS for SMCA
systems but in a new register - MCA_SYND.

Add a synd field to struct mce to hold MCA_SYND register value. Add it
to the end of struct mce to maintain compatibility with old versions of
mcelog. Also, add it to the respective tracepoint.

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1467633035-32080-1-git-send-email-Yazen.Ghannam@amd.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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

@@ -569,6 +569,7 @@ static void mce_read_aux(struct mce *m, int i)
 {
 	if (m->status & MCI_STATUS_MISCV)
 		m->misc = mce_rdmsrl(msr_ops.misc(i));
+
 	if (m->status & MCI_STATUS_ADDRV) {
 		m->addr = mce_rdmsrl(msr_ops.addr(i));
 
@@ -581,6 +582,9 @@ static void mce_read_aux(struct mce *m, int i)
 			m->addr <<= shift;
 		}
 	}
+
+	if (mce_flags.smca && (m->status & MCI_STATUS_SYNDV))
+		m->synd = mce_rdmsrl(MSR_AMD64_SMCA_MCx_SYND(i));
 }
 
 static bool memory_error(struct mce *m)

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

@@ -479,6 +479,9 @@ __log_error(unsigned int bank, bool deferred_err, bool threshold_err, u64 misc)
 	if (m.status & MCI_STATUS_ADDRV)
 		rdmsrl(msr_addr, m.addr);
 
+	if (mce_flags.smca && (m.status & MCI_STATUS_SYNDV))
+		rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m.synd);
+
 	mce_log(&m);
 
 	wrmsrl(msr_status, 0);