| /* |
| * linux/include/linux/nmi.h |
| */ |
| #ifndef LINUX_NMI_H |
| #define LINUX_NMI_H |
| |
| #include <linux/sched.h> |
| #include <asm/irq.h> |
| |
| /* |
| * The run state of the lockup detectors is controlled by the content of the |
| * 'watchdog_enabled' variable. Each lockup detector has its dedicated bit - |
| * bit 0 for the hard lockup detector and bit 1 for the soft lockup detector. |
| * |
| * 'watchdog_user_enabled', 'nmi_watchdog_enabled' and 'soft_watchdog_enabled' |
| * are variables that are only used as an 'interface' between the parameters |
| * in /proc/sys/kernel and the internal state bits in 'watchdog_enabled'. The |
| * 'watchdog_thresh' variable is handled differently because its value is not |
| * boolean, and the lockup detectors are 'suspended' while 'watchdog_thresh' |
| * is equal zero. |
| */ |
| #define NMI_WATCHDOG_ENABLED_BIT 0 |
| #define SOFT_WATCHDOG_ENABLED_BIT 1 |
| #define NMI_WATCHDOG_ENABLED (1 << NMI_WATCHDOG_ENABLED_BIT) |
| #define SOFT_WATCHDOG_ENABLED (1 << SOFT_WATCHDOG_ENABLED_BIT) |
| |
| /** |
| * touch_nmi_watchdog - restart NMI watchdog timeout. |
| * |
| * If the architecture supports the NMI watchdog, touch_nmi_watchdog() |
| * may be used to reset the timeout - for code which intentionally |
| * disables interrupts for a long time. This call is stateless. |
| */ |
| #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) |
| #include <asm/nmi.h> |
| extern void touch_nmi_watchdog(void); |
| #else |
| static inline void touch_nmi_watchdog(void) |
| { |
| touch_softlockup_watchdog(); |
| } |
| #endif |
| |
| #if defined(CONFIG_HARDLOCKUP_DETECTOR) |
| extern void hardlockup_detector_disable(void); |
| #else |
| static inline void hardlockup_detector_disable(void) {} |
| #endif |
| |
| /* |
| * Create trigger_all_cpu_backtrace() out of the arch-provided |
| * base function. Return whether such support was available, |
| * to allow calling code to fall back to some other mechanism: |
| */ |
| #ifdef arch_trigger_cpumask_backtrace |
| static inline bool trigger_all_cpu_backtrace(void) |
| { |
| #if defined(CONFIG_ARM64) |
| arch_trigger_all_cpu_backtrace(); |
| else |
| arch_trigger_cpumask_backtrace(cpu_online_mask, false); |
| #endif |
| |
| return true; |
| } |
| |
| static inline bool trigger_allbutself_cpu_backtrace(void) |
| { |
| #if defined(CONFIG_ARM64) |
| arch_trigger_all_cpu_backtrace(); |
| else |
| arch_trigger_cpumask_backtrace(cpu_online_mask, true); |
| #endif |
| |
| return true; |
| } |
| |
| static inline bool trigger_cpumask_backtrace(struct cpumask *mask) |
| { |
| arch_trigger_cpumask_backtrace(mask, false); |
| |
| return true; |
| } |
| |
| static inline bool trigger_single_cpu_backtrace(int cpu) |
| { |
| arch_trigger_cpumask_backtrace(cpumask_of(cpu), false); |
| |
| return true; |
| } |
| |
| /* generic implementation */ |
| void nmi_trigger_cpumask_backtrace(const cpumask_t *mask, |
| bool exclude_self, |
| void (*raise)(cpumask_t *mask)); |
| bool nmi_cpu_backtrace(struct pt_regs *regs); |
| |
| #else |
| static inline bool trigger_all_cpu_backtrace(void) |
| { |
| return false; |
| } |
| static inline bool trigger_allbutself_cpu_backtrace(void) |
| { |
| return false; |
| } |
| static inline bool trigger_cpumask_backtrace(struct cpumask *mask) |
| { |
| return false; |
| } |
| static inline bool trigger_single_cpu_backtrace(int cpu) |
| { |
| return false; |
| } |
| #endif |
| |
| #ifdef CONFIG_LOCKUP_DETECTOR |
| u64 hw_nmi_get_sample_period(int watchdog_thresh); |
| extern int nmi_watchdog_enabled; |
| extern int soft_watchdog_enabled; |
| extern int watchdog_user_enabled; |
| extern int watchdog_thresh; |
| extern unsigned long watchdog_enabled; |
| extern unsigned long *watchdog_cpumask_bits; |
| extern atomic_t watchdog_park_in_progress; |
| #ifdef CONFIG_SMP |
| extern int sysctl_softlockup_all_cpu_backtrace; |
| extern int sysctl_hardlockup_all_cpu_backtrace; |
| #else |
| #define sysctl_softlockup_all_cpu_backtrace 0 |
| #define sysctl_hardlockup_all_cpu_backtrace 0 |
| #endif |
| extern bool is_hardlockup(void); |
| struct ctl_table; |
| extern int proc_watchdog(struct ctl_table *, int , |
| void __user *, size_t *, loff_t *); |
| extern int proc_nmi_watchdog(struct ctl_table *, int , |
| void __user *, size_t *, loff_t *); |
| extern int proc_soft_watchdog(struct ctl_table *, int , |
| void __user *, size_t *, loff_t *); |
| extern int proc_watchdog_thresh(struct ctl_table *, int , |
| void __user *, size_t *, loff_t *); |
| extern int proc_watchdog_cpumask(struct ctl_table *, int, |
| void __user *, size_t *, loff_t *); |
| extern int lockup_detector_suspend(void); |
| extern void lockup_detector_resume(void); |
| #else |
| static inline int lockup_detector_suspend(void) |
| { |
| return 0; |
| } |
| |
| static inline void lockup_detector_resume(void) |
| { |
| } |
| #endif |
| |
| #ifdef CONFIG_HAVE_ACPI_APEI_NMI |
| #include <asm/nmi.h> |
| #endif |
| |
| #endif |