Linux 4.16-rc2

[linux-block.git] / arch / x86 / kernel / cpu / mcheck / mce-internal.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __X86_MCE_INTERNAL_H__
#define __X86_MCE_INTERNAL_H__

#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 ATTR_LEN		16
#define INITIAL_CHECK_INTERVAL	5 * 60 /* 5 minutes */

/* One object for each MCE bank, shared by all CPUs */
struct mce_bank {
	u64			ctl;			/* subevents to enable */
	unsigned char init;				/* initialise bank? */
	struct device_attribute attr;			/* device attribute */
	char			attrname[ATTR_LEN];	/* attribute name */
};

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);

extern int (*mce_severity)(struct mce *a, int tolerant, char **msg, bool is_excp);
struct dentry *mce_get_debugfs_dir(void);

extern struct mce_bank *mce_banks;
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);
#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) { }
#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

void mce_inject_log(struct mce *m);

/*
 * 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

extern struct mca_config mca_cfg;

#ifndef CONFIG_X86_64
/*
 * On 32-bit systems it would be difficult to safely unmap a poison page
 * from the kernel 1:1 map because there are no non-canonical addresses that
 * we can use to refer to the address without risking a speculative access.
 * However, this isn't much of an issue because:
 * 1) Few unmappable pages are in the 1:1 map. Most are in HIGHMEM which
 *    are only mapped into the kernel as needed
 * 2) Few people would run a 32-bit kernel on a machine that supports
 *    recoverable errors because they have too much memory to boot 32-bit.
 */
static inline void mce_unmap_kpfn(unsigned long pfn) {}
#define mce_unmap_kpfn mce_unmap_kpfn
#endif

#endif /* __X86_MCE_INTERNAL_H__ */