[v3,2/3] x86/mce: Add zhaoxin.c to support Zhaoxin MCA

Commit Message

Tony W Wang-oc Sept. 18, 2024, 5:54 a.m. UTC

From: Lyle Li <[e-mail]>

For the sake of code standardization, add zhaoxin.c to
override the Zhaoxin MCA code.

Signed-off-by: Lyle Li <[e-mail]>
Signed-off-by: Tony W Wang-oc <[e-mail]>
---
 arch/x86/Kconfig                   |  8 ++++
 arch/x86/kernel/cpu/mce/Makefile   |  2 +-
 arch/x86/kernel/cpu/mce/core.c     | 57 --------------------------
 arch/x86/kernel/cpu/mce/internal.h |  7 ++++
 arch/x86/kernel/cpu/mce/zhaoxin.c  | 65 ++++++++++++++++++++++++++++++
 5 files changed, 81 insertions(+), 58 deletions(-)
 create mode 100644 arch/x86/kernel/cpu/mce/zhaoxin.c

Patch

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1d7122a18..b908cdfb9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1171,6 +1171,14 @@  config X86_MCE_INTEL
 	  Additional support for intel specific MCE features such as
 	  the thermal monitor.
 
+config X86_MCE_ZHAOXIN
+	def_bool y
+	prompt "Zhaoxin MCE features"
+	depends on X86_MCE_INTEL
+	help
+	  Additional support for zhaoxin specific MCE features such as
+	  the corrected machine check interrupt.
+
 config X86_MCE_AMD
 	def_bool y
 	prompt "AMD MCE features"
diff --git a/arch/x86/kernel/cpu/mce/Makefile b/arch/x86/kernel/cpu/mce/Makefile
index 015856abd..2e863e78d 100644
--- a/arch/x86/kernel/cpu/mce/Makefile
+++ b/arch/x86/kernel/cpu/mce/Makefile
@@ -5,7 +5,7 @@  obj-$(CONFIG_X86_ANCIENT_MCE)	+= winchip.o p5.o
 obj-$(CONFIG_X86_MCE_INTEL)	+= intel.o
 obj-$(CONFIG_X86_MCE_AMD)	+= amd.o
 obj-$(CONFIG_X86_MCE_THRESHOLD) += threshold.o
-
+obj-$(CONFIG_X86_MCE_ZHAOXIN)   += zhaoxin.o
 mce-inject-y			:= inject.o
 obj-$(CONFIG_X86_MCE_INJECT)	+= mce-inject.o
 
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 7f79d900f..5315c86b6 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -1963,17 +1963,6 @@  static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
 			mce_flags.skx_repmov_quirk = 1;
 	}
 
-	if (c->x86_vendor == X86_VENDOR_ZHAOXIN) {
-		/*
-		 * All newer Zhaoxin CPUs support MCE broadcasting. Enable
-		 * synchronization with a one second timeout.
-		 */
-		if (c->x86 > 6 || (c->x86_model == 0x19 || c->x86_model == 0x1f)) {
-			if (cfg->monarch_timeout < 0)
-				cfg->monarch_timeout = USEC_PER_SEC;
-		}
-	}
-
 	if (cfg->monarch_timeout < 0)
 		cfg->monarch_timeout = 0;
 	if (cfg->bootlog != 0)
@@ -2016,49 +2005,6 @@  static void __mcheck_cpu_init_early(struct cpuinfo_x86 *c)
 	}
 }
 
-static void mce_centaur_feature_init(struct cpuinfo_x86 *c)
-{
-	struct mca_config *cfg = &mca_cfg;
-
-	 /*
-	  * All newer Centaur CPUs support MCE broadcasting. Enable
-	  * synchronization with a one second timeout.
-	  */
-	if ((c->x86 == 6 && c->x86_model == 0xf && c->x86_stepping >= 0xe) ||
-	     c->x86 > 6) {
-		if (cfg->monarch_timeout < 0)
-			cfg->monarch_timeout = USEC_PER_SEC;
-	}
-}
-
-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 which reports only one error type called
-	 * SVAD (System View Address Decoder). The reporting of that error is
-	 * controlled by IA32_MC8.CTL.0.
-	 *
-	 * If enabled, prefetching on these CPUs will cause SVAD MCE when
-	 * virtual machines start and result in a 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();
-	intel_init_lmce();
-}
-
-static void mce_zhaoxin_feature_clear(struct cpuinfo_x86 *c)
-{
-	intel_clear_lmce();
-}
-
 static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
 {
 	switch (c->x86_vendor) {
@@ -2076,9 +2022,6 @@  static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
 		break;
 
 	case X86_VENDOR_CENTAUR:
-		mce_centaur_feature_init(c);
-		break;
-
 	case X86_VENDOR_ZHAOXIN:
 		mce_zhaoxin_feature_init(c);
 		break;
diff --git a/arch/x86/kernel/cpu/mce/internal.h b/arch/x86/kernel/cpu/mce/internal.h
index 01f8f0396..836e56027 100644
--- a/arch/x86/kernel/cpu/mce/internal.h
+++ b/arch/x86/kernel/cpu/mce/internal.h
@@ -334,4 +334,11 @@  static __always_inline u32 mca_msr_reg(int bank, enum mca_msr reg)
 }
 
 extern void (*mc_poll_banks)(void);
+#ifdef CONFIG_X86_MCE_ZHAOXIN
+void mce_zhaoxin_feature_init(struct cpuinfo_x86 *c);
+void mce_zhaoxin_feature_clear(struct cpuinfo_x86 *c);
+#else
+static inline void mce_zhaoxin_feature_init(struct cpuinfo_x86 *c) { }
+static inline void mce_zhaoxin_feature_clear(struct cpuinfo_x86 *c) { }
+#endif
 #endif /* __X86_MCE_INTERNAL_H__ */
diff --git a/arch/x86/kernel/cpu/mce/zhaoxin.c b/arch/x86/kernel/cpu/mce/zhaoxin.c
new file mode 100644
index 000000000..de69c560f
--- /dev/null
+++ b/arch/x86/kernel/cpu/mce/zhaoxin.c
@@ -0,0 +1,65 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Zhaoxin specific MCE features
+ * Author: Lyle Li
+ */
+#include <asm/msr.h>
+#include "internal.h"
+
+static void mce_zhaoxin_apply_mce_broadcast(struct cpuinfo_x86 *c)
+{
+	struct mca_config *cfg = &mca_cfg;
+
+	/* Older CPUs do not do MCE broadcast */
+	if (c->x86 < 6)
+		return;
+	/*
+	 * All newer Zhaoxin and Centaur CPUs support MCE broadcasting. Enable
+	 * synchronization with a one second timeout.
+	 */
+	if (c->x86 > 6)
+		goto mce_broadcast;
+
+	if (c->x86_vendor == X86_VENDOR_CENTAUR) {
+		if (c->x86_model == 0xf && c->x86_stepping >= 0xe)
+			goto mce_broadcast;
+	} else if (c->x86_vendor == X86_VENDOR_ZHAOXIN) {
+		if (c->x86_model == 0x19 || c->x86_model == 0x1f)
+			goto mce_broadcast;
+	}
+
+	return;
+
+mce_broadcast:
+	if (cfg->monarch_timeout <= 0)
+		cfg->monarch_timeout = USEC_PER_SEC;
+}
+
+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 which reports only one error type called
+	 * SVAD (System View Address Decoder). The reporting of that error is
+	 * controlled by IA32_MC8.CTL.0.
+	 *
+	 * If enabled, prefetching on these CPUs will cause SVAD MCE when
+	 * virtual machines start and result in a 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;
+	}
+
+	mce_zhaoxin_apply_mce_broadcast(c);
+	intel_init_cmci();
+	intel_init_lmce();
+}
+
+void mce_zhaoxin_feature_clear(struct cpuinfo_x86 *c)
+{
+	intel_clear_lmce();
+}