linux-kernel - [tip:ras/core] x86/mce/AMD: Extract the error address on SMCA systems

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Date:   Tue, 13 Sep 2016 06:33:06 -0700
From:   tip-bot for Yazen Ghannam <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, Yazen.Ghannam@....com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, hpa@...or.com,
        bp@...e.de
Subject: [tip:ras/core] x86/mce/AMD: Extract the error address on SMCA
 systems

Commit-ID:  4f29b73bae158e3635b8f289f77376b054904ef5
Gitweb:     http://git.kernel.org/tip/4f29b73bae158e3635b8f289f77376b054904ef5
Author:     Yazen Ghannam <Yazen.Ghannam@....com>
AuthorDate: Mon, 12 Sep 2016 09:59:39 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 13 Sep 2016 15:23:13 +0200

x86/mce/AMD: Extract the error address on SMCA systems

The MCA_ADDR registers on Scalable MCA systems contain the ErrorAddr
in bits [55:0] and the least significant bit of the address in bits
[61:56]. We should extract the valid ErrorAddr bits from the MCA_ADDR
register rather than saving the raw value to struct mce.

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Link: http://lkml.kernel.org/r/1473275643-1721-1-git-send-email-Yazen.Ghannam@amd.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/x86/kernel/cpu/mcheck/mce.c     | 10 ++++++++++
 arch/x86/kernel/cpu/mcheck/mce_amd.c | 13 ++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 7d905e3..a7fdf45 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -588,6 +588,16 @@ static void mce_read_aux(struct mce *m, int i)
 			m->addr >>= shift;
 			m->addr <<= shift;
 		}
+
+		/*
+		 * Extract [55:<lsb>] where lsb is the least significant
+		 * *valid* bit of the address bits.
+		 */
+		if (mce_flags.smca) {
+			u8 lsb = (m->addr >> 56) & 0x3f;
+
+			m->addr &= GENMASK_ULL(55, lsb);
+		}
 	}
 
 	if (mce_flags.smca) {
diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index d2f92ab..9b54034 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -561,9 +561,20 @@ __log_error(unsigned int bank, bool deferred_err, bool threshold_err, u64 misc)
 	if (threshold_err)
 		m.misc = misc;
 
-	if (m.status & MCI_STATUS_ADDRV)
+	if (m.status & MCI_STATUS_ADDRV) {
 		rdmsrl(msr_addr, m.addr);
 
+		/*
+		 * Extract [55:<lsb>] where lsb is the least significant
+		 * *valid* bit of the address bits.
+		 */
+		if (mce_flags.smca) {
+			u8 lsb = (m.addr >> 56) & 0x3f;
+
+			m.addr &= GENMASK_ULL(55, lsb);
+		}
+	}
+
 	if (mce_flags.smca) {
 		rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m.ipid);