/*
* The timer bases:
*
- * Note: If we want to add new timer bases, we have to skip the two
- * clock ids captured by the cpu-timers. We do this by holding empty
- * entries rather than doing math adjustment of the clock ids.
- * This ensures that we capture erroneous accesses to these clock ids
- * rather than moving them into the range of valid clock id's.
+ * There are more clockids then hrtimer bases. Thus, we index
+ * into the timer bases by the hrtimer_base_type enum. When trying
+ * to reach a base using a clockid, hrtimer_clockid_to_base()
+ * is used to convert from clockid to the proper hrtimer_base_type.
*/
DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
{
.clock_base =
{
{
- .index = CLOCK_REALTIME,
+ .index = HRTIMER_BASE_MONOTONIC,
+ .clockid = CLOCK_MONOTONIC,
+ .get_time = &ktime_get,
+ .resolution = KTIME_LOW_RES,
+ },
+ {
+ .index = HRTIMER_BASE_REALTIME,
+ .clockid = CLOCK_REALTIME,
.get_time = &ktime_get_real,
.resolution = KTIME_LOW_RES,
},
{
- .index = CLOCK_MONOTONIC,
- .get_time = &ktime_get,
+ .index = HRTIMER_BASE_BOOTTIME,
+ .clockid = CLOCK_BOOTTIME,
+ .get_time = &ktime_get_boottime,
.resolution = KTIME_LOW_RES,
},
}
};
+static const int hrtimer_clock_to_base_table[MAX_CLOCKS] = {
+ [CLOCK_REALTIME] = HRTIMER_BASE_REALTIME,
+ [CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC,
+ [CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME,
+};
+
+static inline int hrtimer_clockid_to_base(clockid_t clock_id)
+{
+ return hrtimer_clock_to_base_table[clock_id];
+}
+
+
/*
* Get the coarse grained time at the softirq based on xtime and
* wall_to_monotonic.
*/
static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
{
- ktime_t xtim, tomono;
- struct timespec xts, tom;
- unsigned long seq;
+ ktime_t xtim, mono, boot;
+ struct timespec xts, tom, slp;
- do {
- seq = read_seqbegin(&xtime_lock);
- xts = __current_kernel_time();
- tom = __get_wall_to_monotonic();
- } while (read_seqretry(&xtime_lock, seq));
+ get_xtime_and_monotonic_and_sleep_offset(&xts, &tom, &slp);
xtim = timespec_to_ktime(xts);
- tomono = timespec_to_ktime(tom);
- base->clock_base[CLOCK_REALTIME].softirq_time = xtim;
- base->clock_base[CLOCK_MONOTONIC].softirq_time =
- ktime_add(xtim, tomono);
+ mono = ktime_add(xtim, timespec_to_ktime(tom));
+ boot = ktime_add(mono, timespec_to_ktime(slp));
+ base->clock_base[HRTIMER_BASE_REALTIME].softirq_time = xtim;
+ base->clock_base[HRTIMER_BASE_MONOTONIC].softirq_time = mono;
+ base->clock_base[HRTIMER_BASE_BOOTTIME].softirq_time = boot;
}
/*
struct hrtimer_cpu_base *new_cpu_base;
int this_cpu = smp_processor_id();
int cpu = hrtimer_get_target(this_cpu, pinned);
+ int basenum = base->index;
again:
new_cpu_base = &per_cpu(hrtimer_bases, cpu);
- new_base = &new_cpu_base->clock_base[base->index];
+ new_base = &new_cpu_base->clock_base[basenum];
if (base != new_base) {
/*
static struct debug_obj_descr hrtimer_debug_descr;
+static void *hrtimer_debug_hint(void *addr)
+{
+ return ((struct hrtimer *) addr)->function;
+}
+
/*
* fixup_init is called when:
* - an active object is initialized
static struct debug_obj_descr hrtimer_debug_descr = {
.name = "hrtimer",
+ .debug_hint = hrtimer_debug_hint,
.fixup_init = hrtimer_fixup_init,
.fixup_activate = hrtimer_fixup_activate,
.fixup_free = hrtimer_fixup_free,
*/
static inline int hrtimer_hres_active(void)
{
- return __get_cpu_var(hrtimer_bases).hres_active;
+ return __this_cpu_read(hrtimer_bases.hres_active);
}
/*
return res;
}
-
-/*
- * Retrigger next event is called after clock was set
- *
- * Called with interrupts disabled via on_each_cpu()
- */
-static void retrigger_next_event(void *arg)
-{
- struct hrtimer_cpu_base *base;
- struct timespec realtime_offset, wtm;
- unsigned long seq;
-
- if (!hrtimer_hres_active())
- return;
-
- do {
- seq = read_seqbegin(&xtime_lock);
- wtm = __get_wall_to_monotonic();
- } while (read_seqretry(&xtime_lock, seq));
- set_normalized_timespec(&realtime_offset, -wtm.tv_sec, -wtm.tv_nsec);
-
- base = &__get_cpu_var(hrtimer_bases);
-
- /* Adjust CLOCK_REALTIME offset */
- raw_spin_lock(&base->lock);
- base->clock_base[CLOCK_REALTIME].offset =
- timespec_to_ktime(realtime_offset);
-
- hrtimer_force_reprogram(base, 0);
- raw_spin_unlock(&base->lock);
-}
-
-/*
- * Clock realtime was set
- *
- * Change the offset of the realtime clock vs. the monotonic
- * clock.
- *
- * We might have to reprogram the high resolution timer interrupt. On
- * SMP we call the architecture specific code to retrigger _all_ high
- * resolution timer interrupts. On UP we just disable interrupts and
- * call the high resolution interrupt code.
- */
-void clock_was_set(void)
-{
- /* Retrigger the CPU local events everywhere */
- on_each_cpu(retrigger_next_event, NULL, 1);
-}
-
-/*
- * During resume we might have to reprogram the high resolution timer
- * interrupt (on the local CPU):
- */
-void hres_timers_resume(void)
-{
- WARN_ONCE(!irqs_disabled(),
- KERN_INFO "hres_timers_resume() called with IRQs enabled!");
-
- retrigger_next_event(NULL);
-}
-
/*
* Initialize the high resolution related parts of cpu_base
*/
base->hres_active = 0;
}
-/*
- * Initialize the high resolution related parts of a hrtimer
- */
-static inline void hrtimer_init_timer_hres(struct hrtimer *timer)
-{
-}
-
-
/*
* When High resolution timers are active, try to reprogram. Note, that in case
* the state has HRTIMER_STATE_CALLBACK set, no reprogramming and no expiry
return 0;
}
+/*
+ * Retrigger next event is called after clock was set
+ *
+ * Called with interrupts disabled via on_each_cpu()
+ */
+static void retrigger_next_event(void *arg)
+{
+ struct hrtimer_cpu_base *base = &__get_cpu_var(hrtimer_bases);
+ struct timespec realtime_offset, xtim, wtm, sleep;
+
+ if (!hrtimer_hres_active())
+ return;
+
+ /* Optimized out for !HIGH_RES */
+ get_xtime_and_monotonic_and_sleep_offset(&xtim, &wtm, &sleep);
+ set_normalized_timespec(&realtime_offset, -wtm.tv_sec, -wtm.tv_nsec);
+
+ /* Adjust CLOCK_REALTIME offset */
+ raw_spin_lock(&base->lock);
+ base->clock_base[HRTIMER_BASE_REALTIME].offset =
+ timespec_to_ktime(realtime_offset);
+ base->clock_base[HRTIMER_BASE_BOOTTIME].offset =
+ timespec_to_ktime(sleep);
+
+ hrtimer_force_reprogram(base, 0);
+ raw_spin_unlock(&base->lock);
+}
+
/*
* Switch to high resolution mode
*/
static int hrtimer_switch_to_hres(void)
{
- int cpu = smp_processor_id();
+ int i, cpu = smp_processor_id();
struct hrtimer_cpu_base *base = &per_cpu(hrtimer_bases, cpu);
unsigned long flags;
return 0;
}
base->hres_active = 1;
- base->clock_base[CLOCK_REALTIME].resolution = KTIME_HIGH_RES;
- base->clock_base[CLOCK_MONOTONIC].resolution = KTIME_HIGH_RES;
+ for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
+ base->clock_base[i].resolution = KTIME_HIGH_RES;
tick_setup_sched_timer();
return 0;
}
static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { }
-static inline void hrtimer_init_timer_hres(struct hrtimer *timer) { }
+static inline void retrigger_next_event(void *arg) { }
#endif /* CONFIG_HIGH_RES_TIMERS */
+/*
+ * Clock realtime was set
+ *
+ * Change the offset of the realtime clock vs. the monotonic
+ * clock.
+ *
+ * We might have to reprogram the high resolution timer interrupt. On
+ * SMP we call the architecture specific code to retrigger _all_ high
+ * resolution timer interrupts. On UP we just disable interrupts and
+ * call the high resolution interrupt code.
+ */
+void clock_was_set(void)
+{
+#ifdef CONFIG_HIGH_RES_TIMERS
+ /* Retrigger the CPU local events everywhere */
+ on_each_cpu(retrigger_next_event, NULL, 1);
+#endif
+ timerfd_clock_was_set();
+}
+
+/*
+ * During resume we might have to reprogram the high resolution timer
+ * interrupt (on the local CPU):
+ */
+void hrtimers_resume(void)
+{
+ WARN_ONCE(!irqs_disabled(),
+ KERN_INFO "hrtimers_resume() called with IRQs enabled!");
+
+ retrigger_next_event(NULL);
+ timerfd_clock_was_set();
+}
+
static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
{
#ifdef CONFIG_TIMER_STATS
debug_activate(timer);
timerqueue_add(&base->active, &timer->node);
+ base->cpu_base->active_bases |= 1 << base->index;
/*
* HRTIMER_STATE_ENQUEUED is or'ed to the current state to preserve the
#endif
}
timerqueue_del(&base->active, &timer->node);
+ if (!timerqueue_getnext(&base->active))
+ base->cpu_base->active_bases &= ~(1 << base->index);
out:
timer->state = newstate;
}
remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base)
{
if (hrtimer_is_queued(timer)) {
+ unsigned long state;
int reprogram;
/*
debug_deactivate(timer);
timer_stats_hrtimer_clear_start_info(timer);
reprogram = base->cpu_base == &__get_cpu_var(hrtimer_bases);
- __remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE,
- reprogram);
+ /*
+ * We must preserve the CALLBACK state flag here,
+ * otherwise we could move the timer base in
+ * switch_hrtimer_base.
+ */
+ state = timer->state & HRTIMER_STATE_CALLBACK;
+ __remove_hrtimer(timer, base, state, reprogram);
return 1;
}
return 0;
*/
ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
{
- struct hrtimer_clock_base *base;
unsigned long flags;
ktime_t rem;
- base = lock_hrtimer_base(timer, &flags);
+ lock_hrtimer_base(timer, &flags);
rem = hrtimer_expires_remaining(timer);
unlock_hrtimer_base(timer, &flags);
enum hrtimer_mode mode)
{
struct hrtimer_cpu_base *cpu_base;
+ int base;
memset(timer, 0, sizeof(struct hrtimer));
if (clock_id == CLOCK_REALTIME && mode != HRTIMER_MODE_ABS)
clock_id = CLOCK_MONOTONIC;
- timer->base = &cpu_base->clock_base[clock_id];
- hrtimer_init_timer_hres(timer);
+ base = hrtimer_clockid_to_base(clock_id);
+ timer->base = &cpu_base->clock_base[base];
timerqueue_init(&timer->node);
#ifdef CONFIG_TIMER_STATS
int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
{
struct hrtimer_cpu_base *cpu_base;
+ int base = hrtimer_clockid_to_base(which_clock);
cpu_base = &__raw_get_cpu_var(hrtimer_bases);
- *tp = ktime_to_timespec(cpu_base->clock_base[which_clock].resolution);
+ *tp = ktime_to_timespec(cpu_base->clock_base[base].resolution);
return 0;
}
BUG_ON(timer->state != HRTIMER_STATE_CALLBACK);
enqueue_hrtimer(timer, base);
}
+
+ WARN_ON_ONCE(!(timer->state & HRTIMER_STATE_CALLBACK));
+
timer->state &= ~HRTIMER_STATE_CALLBACK;
}
void hrtimer_interrupt(struct clock_event_device *dev)
{
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
- struct hrtimer_clock_base *base;
ktime_t expires_next, now, entry_time, delta;
int i, retries = 0;
*/
cpu_base->expires_next.tv64 = KTIME_MAX;
- base = cpu_base->clock_base;
-
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
- ktime_t basenow;
+ struct hrtimer_clock_base *base;
struct timerqueue_node *node;
+ ktime_t basenow;
+
+ if (!(cpu_base->active_bases & (1 << i)))
+ continue;
+ base = cpu_base->clock_base + i;
basenow = ktime_add(now, base->offset);
while ((node = timerqueue_getnext(&base->active))) {
__run_hrtimer(timer, &basenow);
}
- base++;
}
/*
return;
for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) {
- struct timerqueue_node *next;
-
base = &cpu_base->clock_base[index];
- next = timerqueue_getnext(&base->active);
- if (!next)
+ if (!timerqueue_getnext(&base->active))
continue;
if (gettime) {
raw_spin_lock(&cpu_base->lock);
- while ((node = next)) {
+ while ((node = timerqueue_getnext(&base->active))) {
struct hrtimer *timer;
timer = container_of(node, struct hrtimer, node);
struct timespec __user *rmtp;
int ret = 0;
- hrtimer_init_on_stack(&t.timer, restart->nanosleep.index,
+ hrtimer_init_on_stack(&t.timer, restart->nanosleep.clockid,
HRTIMER_MODE_ABS);
hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);
restart = ¤t_thread_info()->restart_block;
restart->fn = hrtimer_nanosleep_restart;
- restart->nanosleep.index = t.timer.base->index;
+ restart->nanosleep.clockid = t.timer.base->clockid;
restart->nanosleep.rmtp = rmtp;
restart->nanosleep.expires = hrtimer_get_expires_tv64(&t.timer);
}
/*
- * A NULL parameter means "inifinte"
+ * A NULL parameter means "infinite"
*/
if (!expires) {
schedule();