150 lines
4.2 KiB
C
150 lines
4.2 KiB
C
/*
|
|
* 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)
|
|
{
|
|
arch_trigger_cpumask_backtrace(cpu_online_mask, false);
|
|
return true;
|
|
}
|
|
|
|
static inline bool trigger_allbutself_cpu_backtrace(void)
|
|
{
|
|
arch_trigger_cpumask_backtrace(cpu_online_mask, true);
|
|
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;
|
|
#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
|