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xfs_dir2_block.c

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  • hrtimer.h 11.47 KiB
    /*
     *  include/linux/hrtimer.h
     *
     *  hrtimers - High-resolution kernel timers
     *
     *   Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
     *   Copyright(C) 2005, Red Hat, Inc., Ingo Molnar
     *
     *  data type definitions, declarations, prototypes
     *
     *  Started by: Thomas Gleixner and Ingo Molnar
     *
     *  For licencing details see kernel-base/COPYING
     */
    #ifndef _LINUX_HRTIMER_H
    #define _LINUX_HRTIMER_H
    
    #include <linux/rbtree.h>
    #include <linux/ktime.h>
    #include <linux/init.h>
    #include <linux/list.h>
    #include <linux/wait.h>
    
    struct hrtimer_clock_base;
    struct hrtimer_cpu_base;
    
    /*
     * Mode arguments of xxx_hrtimer functions:
     */
    enum hrtimer_mode {
    	HRTIMER_MODE_ABS,	/* Time value is absolute */
    	HRTIMER_MODE_REL,	/* Time value is relative to now */
    };
    
    /*
     * Return values for the callback function
     */
    enum hrtimer_restart {
    	HRTIMER_NORESTART,	/* Timer is not restarted */
    	HRTIMER_RESTART,	/* Timer must be restarted */
    };
    
    /*
     * hrtimer callback modes:
     *
     *	HRTIMER_CB_SOFTIRQ:		Callback must run in softirq context
     *	HRTIMER_CB_IRQSAFE:		Callback may run in hardirq context
     *	HRTIMER_CB_IRQSAFE_NO_RESTART:	Callback may run in hardirq context and
     *					does not restart the timer
     *	HRTIMER_CB_IRQSAFE_NO_SOFTIRQ:	Callback must run in hardirq context
     *					Special mode for tick emultation
     */
    enum hrtimer_cb_mode {
    	HRTIMER_CB_SOFTIRQ,
    	HRTIMER_CB_IRQSAFE,
    	HRTIMER_CB_IRQSAFE_NO_RESTART,
    	HRTIMER_CB_IRQSAFE_NO_SOFTIRQ,
    };
    
    /*
     * Values to track state of the timer
     *
     * Possible states:
     *
     * 0x00		inactive
     * 0x01		enqueued into rbtree
     * 0x02		callback function running
     * 0x04		callback pending (high resolution mode)
     *
     * Special case:
     * 0x03		callback function running and enqueued
     *		(was requeued on another CPU)
     * The "callback function running and enqueued" status is only possible on
     * SMP. It happens for example when a posix timer expired and the callback
     * queued a signal. Between dropping the lock which protects the posix timer
     * and reacquiring the base lock of the hrtimer, another CPU can deliver the
     * signal and rearm the timer. We have to preserve the callback running state,
     * as otherwise the timer could be removed before the softirq code finishes the
     * the handling of the timer.
     *
     * The HRTIMER_STATE_ENQUEUED bit is always or'ed to the current state to
     * preserve the HRTIMER_STATE_CALLBACK bit in the above scenario.
     *
     * All state transitions are protected by cpu_base->lock.
     */
    #define HRTIMER_STATE_INACTIVE	0x00
    #define HRTIMER_STATE_ENQUEUED	0x01
    #define HRTIMER_STATE_CALLBACK	0x02
    #define HRTIMER_STATE_PENDING	0x04
    
    /**
     * struct hrtimer - the basic hrtimer structure
     * @node:	red black tree node for time ordered insertion
     * @expires:	the absolute expiry time in the hrtimers internal
     *		representation. The time is related to the clock on
     *		which the timer is based.
     * @function:	timer expiry callback function
     * @base:	pointer to the timer base (per cpu and per clock)
     * @state:	state information (See bit values above)
     * @cb_mode:	high resolution timer feature to select the callback execution
     *		 mode
     * @cb_entry:	list head to enqueue an expired timer into the callback list
     * @start_site:	timer statistics field to store the site where the timer
     *		was started
     * @start_comm: timer statistics field to store the name of the process which
     *		started the timer
     * @start_pid: timer statistics field to store the pid of the task which
     *		started the timer
     *
     * The hrtimer structure must be initialized by hrtimer_init()
     */
    struct hrtimer {
    	struct rb_node			node;
    	ktime_t				expires;
    	enum hrtimer_restart		(*function)(struct hrtimer *);
    	struct hrtimer_clock_base	*base;
    	unsigned long			state;
    	enum hrtimer_cb_mode		cb_mode;
    	struct list_head		cb_entry;
    #ifdef CONFIG_TIMER_STATS
    	void				*start_site;
    	char				start_comm[16];
    	int				start_pid;
    #endif
    };
    
    /**
     * struct hrtimer_sleeper - simple sleeper structure
     * @timer:	embedded timer structure
     * @task:	task to wake up
     *
     * task is set to NULL, when the timer expires.
     */
    struct hrtimer_sleeper {
    	struct hrtimer timer;
    	struct task_struct *task;
    };
    
    /**
     * struct hrtimer_clock_base - the timer base for a specific clock
     * @cpu_base:		per cpu clock base
     * @index:		clock type index for per_cpu support when moving a
     *			timer to a base on another cpu.
     * @active:		red black tree root node for the active timers
     * @first:		pointer to the timer node which expires first
     * @resolution:		the resolution of the clock, in nanoseconds
     * @get_time:		function to retrieve the current time of the clock
     * @get_softirq_time:	function to retrieve the current time from the softirq
     * @softirq_time:	the time when running the hrtimer queue in the softirq
     * @offset:		offset of this clock to the monotonic base
     * @reprogram:		function to reprogram the timer event
     */
    struct hrtimer_clock_base {
    	struct hrtimer_cpu_base	*cpu_base;
    	clockid_t		index;
    	struct rb_root		active;
    	struct rb_node		*first;
    	ktime_t			resolution;
    	ktime_t			(*get_time)(void);
    	ktime_t			(*get_softirq_time)(void);
    	ktime_t			softirq_time;
    #ifdef CONFIG_HIGH_RES_TIMERS
    	ktime_t			offset;
    	int			(*reprogram)(struct hrtimer *t,
    					     struct hrtimer_clock_base *b,
    					     ktime_t n);
    #endif
    };
    
    #define HRTIMER_MAX_CLOCK_BASES 2
    
    /*
     * struct hrtimer_cpu_base - the per cpu clock bases
     * @lock:		lock protecting the base and associated clock bases
     *			and timers
     * @clock_base:		array of clock bases for this cpu
     * @curr_timer:		the timer which is executing a callback right now
     * @expires_next:	absolute time of the next event which was scheduled
     *			via clock_set_next_event()
     * @hres_active:	State of high resolution mode
     * @check_clocks:	Indictator, when set evaluate time source and clock
     *			event devices whether high resolution mode can be
     *			activated.
     * @cb_pending:		Expired timers are moved from the rbtree to this
     *			list in the timer interrupt. The list is processed
     *			in the softirq.
     * @nr_events:		Total number of timer interrupt events
     */
    struct hrtimer_cpu_base {
    	spinlock_t			lock;
    	struct hrtimer_clock_base	clock_base[HRTIMER_MAX_CLOCK_BASES];
    	struct list_head		cb_pending;
    #ifdef CONFIG_HIGH_RES_TIMERS
    	ktime_t				expires_next;
    	int				hres_active;
    	unsigned long			nr_events;
    #endif
    };
    
    #ifdef CONFIG_HIGH_RES_TIMERS
    struct clock_event_device;
    
    extern void clock_was_set(void);
    extern void hres_timers_resume(void);
    extern void hrtimer_interrupt(struct clock_event_device *dev);
    
    /*
     * In high resolution mode the time reference must be read accurate
     */
    static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
    {
    	return timer->base->get_time();
    }
    
    static inline int hrtimer_is_hres_active(struct hrtimer *timer)
    {
    	return timer->base->cpu_base->hres_active;
    }
    
    /*
     * The resolution of the clocks. The resolution value is returned in
     * the clock_getres() system call to give application programmers an
     * idea of the (in)accuracy of timers. Timer values are rounded up to
     * this resolution values.
     */
    # define HIGH_RES_NSEC		1
    # define KTIME_HIGH_RES		(ktime_t) { .tv64 = HIGH_RES_NSEC }
    # define MONOTONIC_RES_NSEC	HIGH_RES_NSEC
    # define KTIME_MONOTONIC_RES	KTIME_HIGH_RES
    
    #else
    
    # define MONOTONIC_RES_NSEC	LOW_RES_NSEC
    # define KTIME_MONOTONIC_RES	KTIME_LOW_RES
    
    /*
     * clock_was_set() is a NOP for non- high-resolution systems. The
     * time-sorted order guarantees that a timer does not expire early and
     * is expired in the next softirq when the clock was advanced.
     */
    static inline void clock_was_set(void) { }
    
    static inline void hres_timers_resume(void) { }
    
    /*
     * In non high resolution mode the time reference is taken from
     * the base softirq time variable.
     */
    static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
    {
    	return timer->base->softirq_time;
    }
    
    static inline int hrtimer_is_hres_active(struct hrtimer *timer)
    {
    	return 0;
    }
    #endif
    
    extern ktime_t ktime_get(void);
    extern ktime_t ktime_get_real(void);
    
    /* Exported timer functions: */
    
    /* Initialize timers: */
    extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
    			 enum hrtimer_mode mode);
    
    #ifdef CONFIG_DEBUG_OBJECTS_TIMERS
    extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
    				  enum hrtimer_mode mode);
    
    extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
    #else
    static inline void hrtimer_init_on_stack(struct hrtimer *timer,
    					 clockid_t which_clock,
    					 enum hrtimer_mode mode)
    {
    	hrtimer_init(timer, which_clock, mode);
    }
    static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
    #endif
    
    /* Basic timer operations: */
    extern int hrtimer_start(struct hrtimer *timer, ktime_t tim,
    			 const enum hrtimer_mode mode);
    extern int hrtimer_cancel(struct hrtimer *timer);
    extern int hrtimer_try_to_cancel(struct hrtimer *timer);
    
    static inline int hrtimer_restart(struct hrtimer *timer)
    {
    	return hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
    }
    
    /* Query timers: */
    extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
    extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
    
    extern ktime_t hrtimer_get_next_event(void);
    
    /*
     * A timer is active, when it is enqueued into the rbtree or the callback
     * function is running.
     */
    static inline int hrtimer_active(const struct hrtimer *timer)
    {
    	return timer->state != HRTIMER_STATE_INACTIVE;
    }
    
    /*
     * Helper function to check, whether the timer is on one of the queues
     */
    static inline int hrtimer_is_queued(struct hrtimer *timer)
    {
    	return timer->state &
    		(HRTIMER_STATE_ENQUEUED | HRTIMER_STATE_PENDING);
    }
    
    /* Forward a hrtimer so it expires after now: */
    extern u64
    hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);
    
    /* Forward a hrtimer so it expires after the hrtimer's current now */
    static inline u64 hrtimer_forward_now(struct hrtimer *timer,
    				      ktime_t interval)
    {
    	return hrtimer_forward(timer, timer->base->get_time(), interval);
    }
    
    /* Precise sleep: */
    extern long hrtimer_nanosleep(struct timespec *rqtp,
    			      struct timespec __user *rmtp,
    			      const enum hrtimer_mode mode,
    			      const clockid_t clockid);
    extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);
    
    extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
    				 struct task_struct *tsk);
    
    /* Soft interrupt function to run the hrtimer queues: */
    extern void hrtimer_run_queues(void);
    extern void hrtimer_run_pending(void);
    
    /* Bootup initialization: */
    extern void __init hrtimers_init(void);
    
    #if BITS_PER_LONG < 64
    extern u64 ktime_divns(const ktime_t kt, s64 div);
    #else /* BITS_PER_LONG < 64 */
    # define ktime_divns(kt, div)		(u64)((kt).tv64 / (div))
    #endif
    
    /* Show pending timers: */
    extern void sysrq_timer_list_show(void);
    
    /*
     * Timer-statistics info:
     */
    #ifdef CONFIG_TIMER_STATS
    
    extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
    				     void *timerf, char *comm,
    				     unsigned int timer_flag);
    
    static inline void timer_stats_account_hrtimer(struct hrtimer *timer)
    {
    	timer_stats_update_stats(timer, timer->start_pid, timer->start_site,
    				 timer->function, timer->start_comm, 0);
    }
    
    extern void __timer_stats_hrtimer_set_start_info(struct hrtimer *timer,
    						 void *addr);
    
    static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
    {
    	__timer_stats_hrtimer_set_start_info(timer, __builtin_return_address(0));
    }
    
    static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer)
    {
    	timer->start_site = NULL;
    }
    #else
    static inline void timer_stats_account_hrtimer(struct hrtimer *timer)
    {
    }
    
    static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
    {
    }
    
    static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer)
    {
    }
    #endif
    
    #endif