Contributors: 31
Author Tokens Token Proportion Commits Commit Proportion
Borislav Petkov 261 23.10% 22 25.58%
Huang Ying 156 13.81% 3 3.49%
Yazen Ghannam 133 11.77% 9 10.47%
Smita Koralahalli 106 9.38% 4 4.65%
Tony Luck 95 8.41% 3 3.49%
Chen Gong 84 7.43% 3 3.49%
Andi Kleen 76 6.73% 7 8.14%
Linus Torvalds 27 2.39% 1 1.16%
Aravind Gopalakrishnan 24 2.12% 3 3.49%
Naveen N. Rao 23 2.04% 1 1.16%
Linus Torvalds (pre-git) 19 1.68% 3 3.49%
Dave Jones 17 1.50% 2 2.33%
Tony W Wang-oc 15 1.33% 2 2.33%
Ashok Raj 13 1.15% 2 2.33%
Thomas Gleixner 12 1.06% 3 3.49%
Mauro Carvalho Chehab 10 0.88% 2 2.33%
Zwane Mwaikambo 10 0.88% 1 1.16%
Chen Yucong 9 0.80% 1 1.16%
Joe Perches 6 0.53% 1 1.16%
Prarit Bhargava 6 0.53% 1 1.16%
Jue Wang 5 0.44% 1 1.16%
Youquan Song 5 0.44% 1 1.16%
Hidetoshi Seto 5 0.44% 2 2.33%
Ingo Molnar 3 0.27% 1 1.16%
Matt Domsch 3 0.27% 1 1.16%
René Herman 2 0.18% 1 1.16%
Vishal Verma 1 0.09% 1 1.16%
Andrew Morton 1 0.09% 1 1.16%
Greg Kroah-Hartman 1 0.09% 1 1.16%
Suresh B. Siddha 1 0.09% 1 1.16%
Kay Sievers 1 0.09% 1 1.16%
Total 1130 86


/* 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 mce;
};

void mce_gen_pool_process(struct work_struct *__unused);
bool mce_gen_pool_empty(void);
int mce_gen_pool_add(struct mce *mce);
int 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
unsigned long cmci_intel_adjust_timer(unsigned long interval);
bool mce_intel_cmci_poll(void);
void mce_intel_hcpu_update(unsigned long cpu);
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
# define cmci_intel_adjust_timer mce_adjust_timer_default
static inline bool mce_intel_cmci_poll(void) { return false; }
static inline void mce_intel_hcpu_update(unsigned long cpu) { }
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(unsigned long interval);

#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);

#ifdef CONFIG_X86_MCE_AMD
extern bool amd_filter_mce(struct mce *m);
bool amd_mce_usable_address(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);
}

#else
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 smca_extract_err_addr(struct mce *m) { }
#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_rdmsrl(u32 msr);

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__ */