posix-timers: Make use of forward/remaining callbacks

Replace the hrtimer calls by calls to the new forward/remaining kclock
callbacks and move the hrtimer specific implementation into the
corresponding callback functions.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20170530211657.121437232@linutronix.de

1 files changed, 49 insertions, 15 deletions

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 795215bba73d..48f6c37ae5df 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -607,6 +607,20 @@ static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags)
         return NULL;
 }
 
+static ktime_t common_hrtimer_remaining(struct k_itimer *timr, ktime_t now)
+{
+        struct hrtimer *timer = &timr->it.real.timer;
+
+        return __hrtimer_expires_remaining_adjusted(timer, now);
+}
+
+static int common_hrtimer_forward(struct k_itimer *timr, ktime_t now)
+{
+        struct hrtimer *timer = &timr->it.real.timer;
+
+        return (int)hrtimer_forward(timer, now, timr->it_interval);
+}
+
 /*
  * Get the time remaining on a POSIX.1b interval timer.  This function
  * is ALWAYS called with spin_lock_irq on the timer, thus it must not
@@ -626,42 +640,54 @@ static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags)
 static void
 common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting)
 {
+        const struct k_clock *kc = timr->kclock;
         ktime_t now, remaining, iv;
-        struct hrtimer *timer = &timr->it.real.timer;
+        struct timespec64 ts64;
+        bool sig_none;
 
         memset(cur_setting, 0, sizeof(*cur_setting));
 
+        sig_none = (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE;
         iv = timr->it_interval;
 
         /* interval timer ? */
-        if (iv)
+        if (iv) {
                 cur_setting->it_interval = ktime_to_timespec64(iv);
-        else if (!hrtimer_active(timer) &&
-                 (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE)
-                return;
+        } else if (!timr->it_active) {
+                /*
+                 * SIGEV_NONE oneshot timers are never queued. Check them
+                 * below.
+                 */
+                if (!sig_none)
+                        return;
+        }
 
-        now = timer->base->get_time();
+        /*
+         * The timespec64 based conversion is suboptimal, but it's not
+         * worth to implement yet another callback.
+         */
+        kc->clock_get(timr->it_clock, &ts64);
+        now = timespec64_to_ktime(ts64);
 
         /*
-         * When a requeue is pending or this is a SIGEV_NONE
-         * timer move the expiry time forward by intervals, so
-         * expiry is > now.
+         * When a requeue is pending or this is a SIGEV_NONE timer move the
+         * expiry time forward by intervals, so expiry is > now.
          */
-        if (iv && (timr->it_requeue_pending & REQUEUE_PENDING ||
-                   (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE))
-                timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv);
+        if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none))
+                timr->it_overrun += kc->timer_forward(timr, now);
 
-        remaining = __hrtimer_expires_remaining_adjusted(timer, now);
+        remaining = kc->timer_remaining(timr, now);
         /* Return 0 only, when the timer is expired and not pending */
         if (remaining <= 0) {
                 /*
                  * A single shot SIGEV_NONE timer must return 0, when
                  * it is expired !
                  */
-                if ((timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE)
+                if (!sig_none)
                         cur_setting->it_value.tv_nsec = 1;
-        } else
+        } else {
                 cur_setting->it_value = ktime_to_timespec64(remaining);
+        }
 }
 
 /* Get the time remaining on a POSIX.1b interval timer. */
@@ -1049,6 +1075,8 @@ static const struct k_clock clock_realtime = {
         .timer_get      = common_timer_get,
         .timer_del      = common_timer_del,
         .timer_rearm    = common_hrtimer_rearm,
+        .timer_forward  = common_hrtimer_forward,
+        .timer_remaining= common_hrtimer_remaining,
 };
 
 static const struct k_clock clock_monotonic = {
@@ -1061,6 +1089,8 @@ static const struct k_clock clock_monotonic = {
         .timer_get      = common_timer_get,
         .timer_del      = common_timer_del,
         .timer_rearm    = common_hrtimer_rearm,
+        .timer_forward  = common_hrtimer_forward,
+        .timer_remaining= common_hrtimer_remaining,
 };
 
 static const struct k_clock clock_monotonic_raw = {
@@ -1088,6 +1118,8 @@ static const struct k_clock clock_tai = {
         .timer_get      = common_timer_get,
         .timer_del      = common_timer_del,
         .timer_rearm    = common_hrtimer_rearm,
+        .timer_forward  = common_hrtimer_forward,
+        .timer_remaining= common_hrtimer_remaining,
 };
 
 static const struct k_clock clock_boottime = {
@@ -1100,6 +1132,8 @@ static const struct k_clock clock_boottime = {
         .timer_get      = common_timer_get,
         .timer_del      = common_timer_del,
         .timer_rearm    = common_hrtimer_rearm,
+        .timer_forward  = common_hrtimer_forward,
+        .timer_remaining= common_hrtimer_remaining,
 };
 
 static const struct k_clock * const posix_clocks[] = {