#include <linux/init.h>
#include <linux/list.h>
#include <linux/wait.h>
+#include <linux/percpu.h>
+#include <linux/timer.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 */
+ HRTIMER_MODE_ABS = 0x0, /* Time value is absolute */
+ HRTIMER_MODE_REL = 0x1, /* Time value is relative to now */
+ HRTIMER_MODE_PINNED = 0x02, /* Timer is bound to CPU */
+ HRTIMER_MODE_ABS_PINNED = 0x02,
+ HRTIMER_MODE_REL_PINNED = 0x03,
};
/*
};
/*
- * 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 softirq 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:
+ * Special cases:
* 0x03 callback function running and enqueued
* (was requeued on another CPU)
+ * 0x09 timer was migrated on CPU hotunplug
* 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
* as otherwise the timer could be removed before the softirq code finishes the
* the handling of the timer.
*
- * The HRTIMER_STATE_ENQUEUE bit is always or'ed to the current state to
+ * 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
+#define HRTIMER_STATE_MIGRATE 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
+ * @_expires: the absolute expiry time in the hrtimers internal
* representation. The time is related to the clock on
- * which the timer is based.
+ * which the timer is based. Is setup by adding
+ * slack to the _softexpires value. For non range timers
+ * identical to _softexpires.
+ * @_softexpires: the absolute earliest expiry time of the hrtimer.
+ * The time which was given as expiry time when the timer
+ * was armed.
* @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
*/
struct hrtimer {
struct rb_node node;
- ktime_t expires;
+ ktime_t _expires;
+ ktime_t _softexpires;
enum hrtimer_restart (*function)(struct hrtimer *);
struct hrtimer_clock_base *base;
unsigned long state;
-#ifdef CONFIG_HIGH_RES_TIMERS
- enum hrtimer_cb_mode cb_mode;
- struct list_head cb_entry;
+#ifdef CONFIG_TIMER_STATS
+ int start_pid;
+ void *start_site;
+ char start_comm[16];
#endif
};
};
/**
- * struct hrtimer_base - the timer base for a specific clock
+ * 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
- * @cb_pending: list of timers where the callback is pending
* @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;
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
};
* struct hrtimer_cpu_base - the per cpu clock bases
* @lock: lock protecting the base and associated clock bases
* and timers
- * @lock_key: the lock_class_key for use with lockdep
* @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
* @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 lock_class_key lock_key;
struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
#ifdef CONFIG_HIGH_RES_TIMERS
ktime_t expires_next;
int hres_active;
- struct list_head cb_pending;
unsigned long nr_events;
#endif
};
+static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
+{
+ timer->_expires = time;
+ timer->_softexpires = time;
+}
+
+static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta)
+{
+ timer->_softexpires = time;
+ timer->_expires = ktime_add_safe(time, delta);
+}
+
+static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, unsigned long delta)
+{
+ timer->_softexpires = time;
+ timer->_expires = ktime_add_safe(time, ns_to_ktime(delta));
+}
+
+static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64)
+{
+ timer->_expires.tv64 = tv64;
+ timer->_softexpires.tv64 = tv64;
+}
+
+static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time)
+{
+ timer->_expires = ktime_add_safe(timer->_expires, time);
+ timer->_softexpires = ktime_add_safe(timer->_softexpires, time);
+}
+
+static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns)
+{
+ timer->_expires = ktime_add_ns(timer->_expires, ns);
+ timer->_softexpires = ktime_add_ns(timer->_softexpires, ns);
+}
+
+static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
+{
+ return timer->_expires;
+}
+
+static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer)
+{
+ return timer->_softexpires;
+}
+
+static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer)
+{
+ return timer->_expires.tv64;
+}
+static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer)
+{
+ return timer->_softexpires.tv64;
+}
+
+static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer)
+{
+ return ktime_to_ns(timer->_expires);
+}
+
+static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer)
+{
+ return ktime_sub(timer->_expires, timer->base->get_time());
+}
+
#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);
/*
return timer->base->get_time();
}
+static inline int hrtimer_is_hres_active(struct hrtimer *timer)
+{
+ return timer->base->cpu_base->hres_active;
+}
+
+extern void hrtimer_peek_ahead_timers(void);
+
/*
* 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 KTIME_HIGH_RES (ktime_t) { .tv64 = 1 }
+# 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
/*
* is expired in the next softirq when the clock was advanced.
*/
static inline void clock_was_set(void) { }
+static inline void hrtimer_peek_ahead_timers(void) { }
+
+static inline void hres_timers_resume(void) { }
/*
* In non high resolution mode the time reference is taken from
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);
+
+DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
+
+
/* 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_start_range_ns(struct hrtimer *timer, ktime_t tim,
+ unsigned long range_ns, const enum hrtimer_mode mode);
+extern int
+__hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
+ unsigned long delta_ns,
+ const enum hrtimer_mode mode, int wakeup);
+
extern int hrtimer_cancel(struct hrtimer *timer);
extern int hrtimer_try_to_cancel(struct hrtimer *timer);
+static inline int hrtimer_start_expires(struct hrtimer *timer,
+ enum hrtimer_mode mode)
+{
+ unsigned long delta;
+ ktime_t soft, hard;
+ soft = hrtimer_get_softexpires(timer);
+ hard = hrtimer_get_expires(timer);
+ delta = ktime_to_ns(ktime_sub(hard, soft));
+ return hrtimer_start_range_ns(timer, soft, delta, mode);
+}
+
static inline int hrtimer_restart(struct hrtimer *timer)
{
- return hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
+ return hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
}
/* Query timers: */
*/
static inline int hrtimer_is_queued(struct hrtimer *timer)
{
- return timer->state &
- (HRTIMER_STATE_ENQUEUED | HRTIMER_STATE_PENDING);
+ return timer->state & HRTIMER_STATE_ENQUEUED;
+}
+
+/*
+ * Helper function to check, whether the timer is running the callback
+ * function
+ */
+static inline int hrtimer_callback_running(struct hrtimer *timer)
+{
+ return timer->state & HRTIMER_STATE_CALLBACK;
}
/* Forward a hrtimer so it expires after now: */
-extern unsigned long
+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,
extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
struct task_struct *tsk);
+extern int schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
+ const enum hrtimer_mode mode);
+extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
+
/* 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 unsigned long ktime_divns(const ktime_t kt, s64 div);
+extern u64 ktime_divns(const ktime_t kt, s64 div);
#else /* BITS_PER_LONG < 64 */
-# define ktime_divns(kt, div) (unsigned long)((kt).tv64 / (div))
+# 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)
+{
+ if (likely(!timer->start_site))
+ return;
+ 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)
+{
+ if (likely(!timer_stats_active))
+ return;
+ __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
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