1 files changed, 352 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mce/internal.h b/arch/x86/kernel/cpu/mce/internal.h
new file mode 100644
index 000000000000..a31cf984619c
--- /dev/null
+++ b/arch/x86/kernel/cpu/mce/internal.h
@@ -0,0 +1,352 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __X86_MCE_INTERNAL_H__
+#define __X86_MCE_INTERNAL_H__
+
+#undef pr_fmt
+#define pr_fmt(fmt) "mce: " fmt
+
+#include <linux/device.h>
+#include <asm/mce.h>
+
+enum severity_level {
+	MCE_NO_SEVERITY,
+	MCE_DEFERRED_SEVERITY,
+	MCE_UCNA_SEVERITY = MCE_DEFERRED_SEVERITY,
+	MCE_KEEP_SEVERITY,
+	MCE_SOME_SEVERITY,
+	MCE_AO_SEVERITY,
+	MCE_UC_SEVERITY,
+	MCE_AR_SEVERITY,
+	MCE_PANIC_SEVERITY,
+};
+
+extern struct blocking_notifier_head x86_mce_decoder_chain;
+
+#define INITIAL_CHECK_INTERVAL	5 * 60 /* 5 minutes */
+
+struct mce_evt_llist {
+	struct llist_node llnode;
+	struct mce_hw_err err;
+};
+
+void mce_gen_pool_process(struct work_struct *__unused);
+bool mce_gen_pool_empty(void);
+bool mce_gen_pool_add(struct mce_hw_err *err);
+bool mce_gen_pool_init(void);
+struct llist_node *mce_gen_pool_prepare_records(void);
+
+int mce_severity(struct mce *a, struct pt_regs *regs, char **msg, bool is_excp);
+struct dentry *mce_get_debugfs_dir(void);
+
+extern mce_banks_t mce_banks_ce_disabled;
+
+#ifdef CONFIG_X86_MCE_INTEL
+void mce_intel_handle_storm(int bank, bool on);
+void cmci_disable_bank(int bank);
+void intel_init_cmci(void);
+void intel_init_lmce(void);
+void intel_clear_lmce(void);
+bool intel_filter_mce(struct mce *m);
+bool intel_mce_usable_address(struct mce *m);
+#else
+static inline void mce_intel_handle_storm(int bank, bool on) { }
+static inline void cmci_disable_bank(int bank) { }
+static inline void intel_init_cmci(void) { }
+static inline void intel_init_lmce(void) { }
+static inline void intel_clear_lmce(void) { }
+static inline bool intel_filter_mce(struct mce *m) { return false; }
+static inline bool intel_mce_usable_address(struct mce *m) { return false; }
+#endif
+
+void mce_timer_kick(bool storm);
+
+#ifdef CONFIG_X86_MCE_THRESHOLD
+void cmci_storm_begin(unsigned int bank);
+void cmci_storm_end(unsigned int bank);
+void mce_track_storm(struct mce *mce);
+void mce_inherit_storm(unsigned int bank);
+bool mce_get_storm_mode(void);
+void mce_set_storm_mode(bool storm);
+u32  mce_get_apei_thr_limit(void);
+#else
+static inline void cmci_storm_begin(unsigned int bank) {}
+static inline void cmci_storm_end(unsigned int bank) {}
+static inline void mce_track_storm(struct mce *mce) {}
+static inline void mce_inherit_storm(unsigned int bank) {}
+static inline bool mce_get_storm_mode(void) { return false; }
+static inline void mce_set_storm_mode(bool storm) {}
+static inline u32  mce_get_apei_thr_limit(void) { return 0; }
+#endif
+
+/*
+ * history:		Bitmask tracking errors occurrence. Each set bit
+ *			represents an error seen.
+ *
+ * timestamp:		Last time (in jiffies) that the bank was polled.
+ * in_storm_mode:	Is this bank in storm mode?
+ * poll_only:		Bank does not support CMCI, skip storm tracking.
+ */
+struct storm_bank {
+	u64 history;
+	u64 timestamp;
+	bool in_storm_mode;
+	bool poll_only;
+};
+
+#define NUM_HISTORY_BITS (sizeof(u64) * BITS_PER_BYTE)
+
+/* How many errors within the history buffer mark the start of a storm. */
+#define STORM_BEGIN_THRESHOLD	5
+
+/*
+ * How many polls of machine check bank without an error before declaring
+ * the storm is over. Since it is tracked by the bitmasks in the history
+ * field of struct storm_bank the mask is 30 bits [0 ... 29].
+ */
+#define STORM_END_POLL_THRESHOLD	29
+
+/*
+ * banks:		per-cpu, per-bank details
+ * stormy_bank_count:	count of MC banks in storm state
+ * poll_mode:		CPU is in poll mode
+ */
+struct mca_storm_desc {
+	struct storm_bank	banks[MAX_NR_BANKS];
+	u8			stormy_bank_count;
+	bool			poll_mode;
+};
+
+DECLARE_PER_CPU(struct mca_storm_desc, storm_desc);
+
+#ifdef CONFIG_ACPI_APEI
+int apei_write_mce(struct mce *m);
+ssize_t apei_read_mce(struct mce *m, u64 *record_id);
+int apei_check_mce(void);
+int apei_clear_mce(u64 record_id);
+#else
+static inline int apei_write_mce(struct mce *m)
+{
+	return -EINVAL;
+}
+static inline ssize_t apei_read_mce(struct mce *m, u64 *record_id)
+{
+	return 0;
+}
+static inline int apei_check_mce(void)
+{
+	return 0;
+}
+static inline int apei_clear_mce(u64 record_id)
+{
+	return -EINVAL;
+}
+#endif
+
+/*
+ * We consider records to be equivalent if bank+status+addr+misc all match.
+ * This is only used when the system is going down because of a fatal error
+ * to avoid cluttering the console log with essentially repeated information.
+ * In normal processing all errors seen are logged.
+ */
+static inline bool mce_cmp(struct mce *m1, struct mce *m2)
+{
+	return m1->bank != m2->bank ||
+		m1->status != m2->status ||
+		m1->addr != m2->addr ||
+		m1->misc != m2->misc;
+}
+
+extern struct device_attribute dev_attr_trigger;
+
+#ifdef CONFIG_X86_MCELOG_LEGACY
+void mce_work_trigger(void);
+void mce_register_injector_chain(struct notifier_block *nb);
+void mce_unregister_injector_chain(struct notifier_block *nb);
+#else
+static inline void mce_work_trigger(void)	{ }
+static inline void mce_register_injector_chain(struct notifier_block *nb)	{ }
+static inline void mce_unregister_injector_chain(struct notifier_block *nb)	{ }
+#endif
+
+struct mca_config {
+	__u64 lmce_disabled		: 1,
+	      disabled			: 1,
+	      ser			: 1,
+	      recovery			: 1,
+	      bios_cmci_threshold	: 1,
+	      /* Proper #MC exception handler is set */
+	      initialized		: 1,
+	      __reserved		: 58;
+
+	bool dont_log_ce;
+	bool cmci_disabled;
+	bool ignore_ce;
+	bool print_all;
+
+	int monarch_timeout;
+	int panic_timeout;
+	u32 rip_msr;
+	s8 bootlog;
+};
+
+extern struct mca_config mca_cfg;
+DECLARE_PER_CPU_READ_MOSTLY(unsigned int, mce_num_banks);
+
+struct mce_vendor_flags {
+	/*
+	 * Indicates that overflow conditions are not fatal, when set.
+	 */
+	__u64 overflow_recov	: 1,
+
+	/*
+	 * (AMD) SUCCOR stands for S/W UnCorrectable error COntainment and
+	 * Recovery. It indicates support for data poisoning in HW and deferred
+	 * error interrupts.
+	 */
+	succor			: 1,
+
+	/*
+	 * (AMD) SMCA: This bit indicates support for Scalable MCA which expands
+	 * the register space for each MCA bank and also increases number of
+	 * banks. Also, to accommodate the new banks and registers, the MCA
+	 * register space is moved to a new MSR range.
+	 */
+	smca			: 1,
+
+	/* Zen IFU quirk */
+	zen_ifu_quirk		: 1,
+
+	/* AMD-style error thresholding banks present. */
+	amd_threshold		: 1,
+
+	/* Pentium, family 5-style MCA */
+	p5			: 1,
+
+	/* Centaur Winchip C6-style MCA */
+	winchip			: 1,
+
+	/* SandyBridge IFU quirk */
+	snb_ifu_quirk		: 1,
+
+	/* Skylake, Cascade Lake, Cooper Lake REP;MOVS* quirk */
+	skx_repmov_quirk	: 1,
+
+	__reserved_0		: 55;
+};
+
+extern struct mce_vendor_flags mce_flags;
+
+struct mce_bank {
+	/* subevents to enable */
+	u64			ctl;
+
+	/* initialise bank? */
+	__u64 init		: 1,
+
+	/*
+	 * (AMD) MCA_CONFIG[McaLsbInStatusSupported]: When set, this bit indicates
+	 * the LSB field is found in MCA_STATUS and not in MCA_ADDR.
+	 */
+	lsb_in_status		: 1,
+
+	__reserved_1		: 62;
+};
+
+DECLARE_PER_CPU_READ_MOSTLY(struct mce_bank[MAX_NR_BANKS], mce_banks_array);
+
+enum mca_msr {
+	MCA_CTL,
+	MCA_STATUS,
+	MCA_ADDR,
+	MCA_MISC,
+};
+
+/* Decide whether to add MCE record to MCE event pool or filter it out. */
+extern bool filter_mce(struct mce *m);
+void mce_prep_record_common(struct mce *m);
+void mce_prep_record_per_cpu(unsigned int cpu, struct mce *m);
+
+#ifdef CONFIG_X86_MCE_AMD
+void mce_threshold_create_device(unsigned int cpu);
+void mce_threshold_remove_device(unsigned int cpu);
+void mce_amd_handle_storm(unsigned int bank, bool on);
+extern bool amd_filter_mce(struct mce *m);
+bool amd_mce_usable_address(struct mce *m);
+void amd_clear_bank(struct mce *m);
+
+/*
+ * If MCA_CONFIG[McaLsbInStatusSupported] is set, extract ErrAddr in bits
+ * [56:0] of MCA_STATUS, else in bits [55:0] of MCA_ADDR.
+ */
+static __always_inline void smca_extract_err_addr(struct mce *m)
+{
+	u8 lsb;
+
+	if (!mce_flags.smca)
+		return;
+
+	if (this_cpu_ptr(mce_banks_array)[m->bank].lsb_in_status) {
+		lsb = (m->status >> 24) & 0x3f;
+
+		m->addr &= GENMASK_ULL(56, lsb);
+
+		return;
+	}
+
+	lsb = (m->addr >> 56) & 0x3f;
+
+	m->addr &= GENMASK_ULL(55, lsb);
+}
+
+void smca_bsp_init(void);
+#else
+static inline void mce_threshold_create_device(unsigned int cpu)	{ }
+static inline void mce_threshold_remove_device(unsigned int cpu)	{ }
+static inline void mce_amd_handle_storm(unsigned int bank, bool on)	{ }
+static inline bool amd_filter_mce(struct mce *m) { return false; }
+static inline bool amd_mce_usable_address(struct mce *m) { return false; }
+static inline void amd_clear_bank(struct mce *m) { }
+static inline void smca_extract_err_addr(struct mce *m) { }
+static inline void smca_bsp_init(void) { }
+#endif
+
+#ifdef CONFIG_X86_ANCIENT_MCE
+void intel_p5_mcheck_init(struct cpuinfo_x86 *c);
+void winchip_mcheck_init(struct cpuinfo_x86 *c);
+noinstr void pentium_machine_check(struct pt_regs *regs);
+noinstr void winchip_machine_check(struct pt_regs *regs);
+static inline void enable_p5_mce(void) { mce_p5_enabled = 1; }
+#else
+static __always_inline void intel_p5_mcheck_init(struct cpuinfo_x86 *c) {}
+static __always_inline void winchip_mcheck_init(struct cpuinfo_x86 *c) {}
+static __always_inline void enable_p5_mce(void) {}
+static __always_inline void pentium_machine_check(struct pt_regs *regs) {}
+static __always_inline void winchip_machine_check(struct pt_regs *regs) {}
+#endif
+
+noinstr u64 mce_rdmsrq(u32 msr);
+noinstr void mce_wrmsrq(u32 msr, u64 v);
+
+static __always_inline u32 mca_msr_reg(int bank, enum mca_msr reg)
+{
+	if (cpu_feature_enabled(X86_FEATURE_SMCA)) {
+		switch (reg) {
+		case MCA_CTL:	 return MSR_AMD64_SMCA_MCx_CTL(bank);
+		case MCA_ADDR:	 return MSR_AMD64_SMCA_MCx_ADDR(bank);
+		case MCA_MISC:	 return MSR_AMD64_SMCA_MCx_MISC(bank);
+		case MCA_STATUS: return MSR_AMD64_SMCA_MCx_STATUS(bank);
+		}
+	}
+
+	switch (reg) {
+	case MCA_CTL:	 return MSR_IA32_MCx_CTL(bank);
+	case MCA_ADDR:	 return MSR_IA32_MCx_ADDR(bank);
+	case MCA_MISC:	 return MSR_IA32_MCx_MISC(bank);
+	case MCA_STATUS: return MSR_IA32_MCx_STATUS(bank);
+	}
+
+	return 0;
+}
+
+extern void (*mc_poll_banks)(void);
+#endif /* __X86_MCE_INTERNAL_H__ */