linux-kernel - [PATCH 4/7] x86/mce: Define vendor-specific MSR accessors

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Date:	Sat, 30 Apr 2016 14:33:54 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Tony Luck <tony.luck@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/7] x86/mce: Define vendor-specific MSR accessors

From: Yazen Ghannam <Yazen.Ghannam@....com>

Scalable MCA processors have a whole new range of MSR addresses to
obtain bank related info such as CTL, MISC, ADDR, STATUS. Therefore, we
need a way to abstract the MSR addresses per vendor.

Carved out from a patch by Aravind Gopalakrishnan
<Aravind.Gopalakrishnan@....com>.

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@....com>
Cc: Aravind Gopalakrishnan <aravindksg.lkml@...il.com>
Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: linux-edac <linux-edac@...r.kernel.org>
Cc: x86-ml <x86@...nel.org>
Link: http://lkml.kernel.org/r/1460561913-24317-5-git-send-email-Yazen.Ghannam@amd.com
Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/include/asm/mce.h       | 15 +++++++++++++
 arch/x86/kernel/cpu/mcheck/mce.c | 47 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 92b6f651fa4f..53ab69704771 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -104,10 +104,16 @@
 #define MCE_LOG_SIGNATURE	"MACHINECHECK"
 
 /* AMD Scalable MCA */
+#define MSR_AMD64_SMCA_MC0_CTL		0xc0002000
+#define MSR_AMD64_SMCA_MC0_STATUS	0xc0002001
+#define MSR_AMD64_SMCA_MC0_ADDR		0xc0002002
 #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_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))
@@ -168,9 +174,18 @@ struct mce_vendor_flags {
 
 	      __reserved_0	: 61;
 };
+
+struct mca_msr_regs {
+	u32 (*ctl)	(int bank);
+	u32 (*status)	(int bank);
+	u32 (*addr)	(int bank);
+	u32 (*misc)	(int bank);
+};
+
 extern struct mce_vendor_flags mce_flags;
 
 extern struct mca_config mca_cfg;
+extern struct mca_msr_regs msr_ops;
 extern void mce_register_decode_chain(struct notifier_block *nb);
 extern void mce_unregister_decode_chain(struct notifier_block *nb);
 
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 6bffb26e05e0..54a4881b9475 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -224,6 +224,53 @@ void mce_unregister_decode_chain(struct notifier_block *nb)
 }
 EXPORT_SYMBOL_GPL(mce_unregister_decode_chain);
 
+static inline u32 ctl_reg(int bank)
+{
+	return MSR_IA32_MCx_CTL(bank);
+}
+
+static inline u32 status_reg(int bank)
+{
+	return MSR_IA32_MCx_STATUS(bank);
+}
+
+static inline u32 addr_reg(int bank)
+{
+	return MSR_IA32_MCx_ADDR(bank);
+}
+
+static inline u32 misc_reg(int bank)
+{
+	return MSR_IA32_MCx_MISC(bank);
+}
+
+static inline u32 smca_ctl_reg(int bank)
+{
+	return MSR_AMD64_SMCA_MCx_CTL(bank);
+}
+
+static inline u32 smca_status_reg(int bank)
+{
+	return MSR_AMD64_SMCA_MCx_STATUS(bank);
+}
+
+static inline u32 smca_addr_reg(int bank)
+{
+	return MSR_AMD64_SMCA_MCx_ADDR(bank);
+}
+
+static inline u32 smca_misc_reg(int bank)
+{
+	return MSR_AMD64_SMCA_MCx_MISC(bank);
+}
+
+struct mca_msr_regs msr_ops = {
+	.ctl	= ctl_reg,
+	.status	= status_reg,
+	.addr	= addr_reg,
+	.misc	= misc_reg
+};
+
 static void print_mce(struct mce *m)
 {
 	int ret = 0;
-- 
2.7.3