[PATCH v3 3/4] x86/mce: Add Zhaoxin CMCI support

[Tony W Wang-oc]

All Zhaoxin newer CPUs support CMCI that compatible with Intel's
"Machine-Check Architecture", so add support for Zhaoxin CMCI in
mce/core.c and mce/intel.c.

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@xxxxxxxxxxx>
---
v2->v3:
 - Rework mce_zhaoxin_feature_init() as static
 - Rework comment about Zhaoxin MCA SVAD and CMCI
 - Simplify Zhaoxin CPU FMS checking

v1->v2:
 - Fix redefinition of "mce_zhaoxin_feature_init"

 arch/x86/kernel/cpu/mce/core.c  | 25 +++++++++++++++++++++++++
 arch/x86/kernel/cpu/mce/intel.c |  5 ++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 7bcd8c1..65c5a1f 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -1777,6 +1777,27 @@ static void mce_centaur_feature_init(struct cpuinfo_x86 *c)
 	}
 }
 
+static void mce_zhaoxin_feature_init(struct cpuinfo_x86 *c)
+{
+	struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array);
+
+	/*
+	 * These CPUs have MCA bank 8, that only has one error called SVAD
+	 * (System View Address Decoder) which be controlled by IA32_MC8.CTL.0
+	 * If enabled, the prefetch on these CPUs will cause SVAD machine
+	 * check exception when virtual machine startup and cause system
+	 * panic. Always disable bank 8 SVAD error by default.
+	 */
+	if ((c->x86 == 7 && c->x86_model == 0x1b) ||
+	    (c->x86_model == 0x19 || c->x86_model == 0x1f)) {
+		if (this_cpu_read(mce_num_banks) > 8)
+			mce_banks[8].ctl = 0;
+	}
+
+	intel_init_cmci();
+	mce_adjust_timer = cmci_intel_adjust_timer;
+}
+
 static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
 {
 	switch (c->x86_vendor) {
@@ -1798,6 +1819,10 @@ static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
 		mce_centaur_feature_init(c);
 		break;
 
+	case X86_VENDOR_ZHAOXIN:
+		mce_zhaoxin_feature_init(c);
+		break;
+
 	default:
 		break;
 	}
diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c
index 70799a5..87c473f 100644
--- a/arch/x86/kernel/cpu/mce/intel.c
+++ b/arch/x86/kernel/cpu/mce/intel.c
@@ -84,9 +84,12 @@ static int cmci_supported(int *banks)
 	 * Vendor check is not strictly needed, but the initial
 	 * initialization is vendor keyed and this
 	 * makes sure none of the backdoors are entered otherwise.
+	 * Checks the vendor are Intel/Zhaoxin-specific:
 	 */
-	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL &&
+	    boot_cpu_data.x86_vendor != X86_VENDOR_ZHAOXIN)
 		return 0;
+
 	if (!boot_cpu_has(X86_FEATURE_APIC) || lapic_get_maxlvt() < 6)
 		return 0;
 	rdmsrl(MSR_IA32_MCG_CAP, cap);
-- 
2.7.4