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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_NMI_H
#define _ASM_X86_NMI_H
#include <linux/irq_work.h>
#include <linux/pm.h>
#include <asm/irq.h>
#include <asm/io.h>
#ifdef CONFIG_X86_LOCAL_APIC
extern int reserve_perfctr_nmi(unsigned int);
extern void release_perfctr_nmi(unsigned int);
extern int reserve_evntsel_nmi(unsigned int);
extern void release_evntsel_nmi(unsigned int);
#endif /* CONFIG_X86_LOCAL_APIC */
extern int unknown_nmi_panic;
extern int panic_on_unrecovered_nmi;
extern int panic_on_io_nmi;
/* NMI handler flags */
#define NMI_FLAG_FIRST 1
/**
* enum - NMI types.
* @NMI_LOCAL: Local NMI, CPU-specific NMI generated by the Local APIC.
* @NMI_UNKNOWN: Unknown NMI, the source of the NMI may not be identified.
* @NMI_SERR: System Error NMI, typically triggered by PCI errors.
* @NMI_IO_CHECK: I/O Check NMI, related to I/O errors.
* @NMI_MAX: Maximum value for NMI types.
*
* NMI types are used to categorize NMIs and to dispatch them to the
* appropriate handler.
*/
enum {
NMI_LOCAL=0,
NMI_UNKNOWN,
NMI_SERR,
NMI_IO_CHECK,
NMI_MAX
};
/* NMI handler return values */
#define NMI_DONE 0
#define NMI_HANDLED 1
typedef int (*nmi_handler_t)(unsigned int, struct pt_regs *);
struct nmiaction {
struct list_head list;
nmi_handler_t handler;
u64 max_duration;
unsigned long flags;
const char *name;
};
/**
* register_nmi_handler - Register a handler for a specific NMI type
* @t: NMI type (e.g. NMI_LOCAL)
* @fn: The NMI handler
* @fg: Flags associated with the NMI handler
* @n: Name of the NMI handler
* @init: Optional __init* attributes for struct nmiaction
*
* Adds the provided handler to the list of handlers for the specified
* NMI type. Handlers flagged with NMI_FLAG_FIRST would be executed first.
*
* Sometimes the source of an NMI can't be reliably determined which
* results in an NMI being tagged as "unknown". Register an additional
* handler using the NMI type - NMI_UNKNOWN to handle such cases. The
* caller would get one last chance to assume responsibility for the
* NMI.
*
* Return: 0 on success, or an error code on failure.
*/
#define register_nmi_handler(t, fn, fg, n, init...) \
({ \
static struct nmiaction init fn##_na = { \
.list = LIST_HEAD_INIT(fn##_na.list), \
.handler = (fn), \
.name = (n), \
.flags = (fg), \
}; \
__register_nmi_handler((t), &fn##_na); \
})
int __register_nmi_handler(unsigned int, struct nmiaction *);
/**
* unregister_nmi_handler - Unregister a handler for a specific NMI type
* @type: NMI type (e.g. NMI_LOCAL)
* @name: Name of the NMI handler used during registration
*
* Removes the handler associated with the specified NMI type from the
* NMI handler list. The "name" is used as a lookup key to identify the
* handler.
*/
void unregister_nmi_handler(unsigned int type, const char *name);
void set_emergency_nmi_handler(unsigned int type, nmi_handler_t handler);
void stop_nmi(void);
void restart_nmi(void);
void local_touch_nmi(void);
#endif /* _ASM_X86_NMI_H */
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