| 1 | /* |
| 2 | * linux/include/linux/nmi.h |
| 3 | */ |
| 4 | #ifndef LINUX_NMI_H |
| 5 | #define LINUX_NMI_H |
| 6 | |
| 7 | #include <linux/sched.h> |
| 8 | #include <asm/irq.h> |
| 9 | |
| 10 | /** |
| 11 | * touch_nmi_watchdog - restart NMI watchdog timeout. |
| 12 | * |
| 13 | * If the architecture supports the NMI watchdog, touch_nmi_watchdog() |
| 14 | * may be used to reset the timeout - for code which intentionally |
| 15 | * disables interrupts for a long time. This call is stateless. |
| 16 | */ |
| 17 | #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) |
| 18 | #include <asm/nmi.h> |
| 19 | extern void touch_nmi_watchdog(void); |
| 20 | #else |
| 21 | static inline void touch_nmi_watchdog(void) |
| 22 | { |
| 23 | touch_softlockup_watchdog(); |
| 24 | } |
| 25 | #endif |
| 26 | |
| 27 | #if defined(CONFIG_HARDLOCKUP_DETECTOR) |
| 28 | extern void hardlockup_detector_disable(void); |
| 29 | #else |
| 30 | static inline void hardlockup_detector_disable(void) {} |
| 31 | #endif |
| 32 | |
| 33 | /* |
| 34 | * Create trigger_all_cpu_backtrace() out of the arch-provided |
| 35 | * base function. Return whether such support was available, |
| 36 | * to allow calling code to fall back to some other mechanism: |
| 37 | */ |
| 38 | #ifdef arch_trigger_all_cpu_backtrace |
| 39 | static inline bool trigger_all_cpu_backtrace(void) |
| 40 | { |
| 41 | arch_trigger_all_cpu_backtrace(true); |
| 42 | |
| 43 | return true; |
| 44 | } |
| 45 | static inline bool trigger_allbutself_cpu_backtrace(void) |
| 46 | { |
| 47 | arch_trigger_all_cpu_backtrace(false); |
| 48 | return true; |
| 49 | } |
| 50 | |
| 51 | /* generic implementation */ |
| 52 | void nmi_trigger_all_cpu_backtrace(bool include_self, |
| 53 | void (*raise)(cpumask_t *mask)); |
| 54 | bool nmi_cpu_backtrace(struct pt_regs *regs); |
| 55 | |
| 56 | #else |
| 57 | static inline bool trigger_all_cpu_backtrace(void) |
| 58 | { |
| 59 | return false; |
| 60 | } |
| 61 | static inline bool trigger_allbutself_cpu_backtrace(void) |
| 62 | { |
| 63 | return false; |
| 64 | } |
| 65 | #endif |
| 66 | |
| 67 | #ifdef CONFIG_LOCKUP_DETECTOR |
| 68 | u64 hw_nmi_get_sample_period(int watchdog_thresh); |
| 69 | extern int nmi_watchdog_enabled; |
| 70 | extern int soft_watchdog_enabled; |
| 71 | extern int watchdog_user_enabled; |
| 72 | extern int watchdog_thresh; |
| 73 | extern unsigned long *watchdog_cpumask_bits; |
| 74 | extern int sysctl_softlockup_all_cpu_backtrace; |
| 75 | extern int sysctl_hardlockup_all_cpu_backtrace; |
| 76 | struct ctl_table; |
| 77 | extern int proc_watchdog(struct ctl_table *, int , |
| 78 | void __user *, size_t *, loff_t *); |
| 79 | extern int proc_nmi_watchdog(struct ctl_table *, int , |
| 80 | void __user *, size_t *, loff_t *); |
| 81 | extern int proc_soft_watchdog(struct ctl_table *, int , |
| 82 | void __user *, size_t *, loff_t *); |
| 83 | extern int proc_watchdog_thresh(struct ctl_table *, int , |
| 84 | void __user *, size_t *, loff_t *); |
| 85 | extern int proc_watchdog_cpumask(struct ctl_table *, int, |
| 86 | void __user *, size_t *, loff_t *); |
| 87 | extern int lockup_detector_suspend(void); |
| 88 | extern void lockup_detector_resume(void); |
| 89 | #else |
| 90 | static inline int lockup_detector_suspend(void) |
| 91 | { |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static inline void lockup_detector_resume(void) |
| 96 | { |
| 97 | } |
| 98 | #endif |
| 99 | |
| 100 | #ifdef CONFIG_HAVE_ACPI_APEI_NMI |
| 101 | #include <asm/nmi.h> |
| 102 | #endif |
| 103 | |
| 104 | #endif |