xref: /openbmc/linux/arch/x86/include/asm/nmi.h (revision fd589a8f)
1 #ifndef _ASM_X86_NMI_H
2 #define _ASM_X86_NMI_H
3 
4 #include <linux/pm.h>
5 #include <asm/irq.h>
6 #include <asm/io.h>
7 
8 #ifdef ARCH_HAS_NMI_WATCHDOG
9 
10 /**
11  * do_nmi_callback
12  *
13  * Check to see if a callback exists and execute it.  Return 1
14  * if the handler exists and was handled successfully.
15  */
16 int do_nmi_callback(struct pt_regs *regs, int cpu);
17 
18 extern void die_nmi(char *str, struct pt_regs *regs, int do_panic);
19 extern int check_nmi_watchdog(void);
20 extern int nmi_watchdog_enabled;
21 extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
22 extern int avail_to_resrv_perfctr_nmi(unsigned int);
23 extern int reserve_perfctr_nmi(unsigned int);
24 extern void release_perfctr_nmi(unsigned int);
25 extern int reserve_evntsel_nmi(unsigned int);
26 extern void release_evntsel_nmi(unsigned int);
27 
28 extern void setup_apic_nmi_watchdog(void *);
29 extern void stop_apic_nmi_watchdog(void *);
30 extern void disable_timer_nmi_watchdog(void);
31 extern void enable_timer_nmi_watchdog(void);
32 extern int nmi_watchdog_tick(struct pt_regs *regs, unsigned reason);
33 extern void cpu_nmi_set_wd_enabled(void);
34 
35 extern atomic_t nmi_active;
36 extern unsigned int nmi_watchdog;
37 #define NMI_NONE	0
38 #define NMI_IO_APIC	1
39 #define NMI_LOCAL_APIC	2
40 #define NMI_INVALID	3
41 
42 struct ctl_table;
43 struct file;
44 extern int proc_nmi_enabled(struct ctl_table *, int , struct file *,
45 			void __user *, size_t *, loff_t *);
46 extern int unknown_nmi_panic;
47 
48 void arch_trigger_all_cpu_backtrace(void);
49 #define arch_trigger_all_cpu_backtrace arch_trigger_all_cpu_backtrace
50 
51 static inline void localise_nmi_watchdog(void)
52 {
53 	if (nmi_watchdog == NMI_IO_APIC)
54 		nmi_watchdog = NMI_LOCAL_APIC;
55 }
56 
57 /* check if nmi_watchdog is active (ie was specified at boot) */
58 static inline int nmi_watchdog_active(void)
59 {
60 	/*
61 	 * actually it should be:
62 	 * 	return (nmi_watchdog == NMI_LOCAL_APIC ||
63 	 * 		nmi_watchdog == NMI_IO_APIC)
64 	 * but since they are power of two we could use a
65 	 * cheaper way --cvg
66 	 */
67 	return nmi_watchdog & (NMI_LOCAL_APIC | NMI_IO_APIC);
68 }
69 #endif
70 
71 void lapic_watchdog_stop(void);
72 int lapic_watchdog_init(unsigned nmi_hz);
73 int lapic_wd_event(unsigned nmi_hz);
74 unsigned lapic_adjust_nmi_hz(unsigned hz);
75 void disable_lapic_nmi_watchdog(void);
76 void enable_lapic_nmi_watchdog(void);
77 void stop_nmi(void);
78 void restart_nmi(void);
79 
80 #endif /* _ASM_X86_NMI_H */
81