hrtimer: Prepare handling of hard and softirq based hrtimers

The softirq based hrtimer can utilize most of the existing hrtimers
functions, but need to operate on a different data set.

Add an 'active_mask' parameter to various functions so the hard and soft bases
can be selected. Fixup the existing callers and hand in the ACTIVE_HARD
mask.

Signed-off-by: Anna-Maria Gleixner <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

Author: anna-marialx

kernel/time/hrtimer.c

@@ -59,6 +59,15 @@
 
 #include "tick-internal.h"
 
+/*
+ * Masks for selecting the soft and hard context timers from
+ * cpu_base->active
+ */
+#define MASK_SHIFT		(HRTIMER_BASE_MONOTONIC_SOFT)
+#define HRTIMER_ACTIVE_HARD	((1U << MASK_SHIFT) - 1)
+#define HRTIMER_ACTIVE_SOFT	(HRTIMER_ACTIVE_HARD << MASK_SHIFT)
+#define HRTIMER_ACTIVE_ALL	(HRTIMER_ACTIVE_SOFT | HRTIMER_ACTIVE_HARD)
+
 /*
  * The timer bases:
  *
@@ -507,13 +516,24 @@ static ktime_t __hrtimer_next_event_base(struct hrtimer_cpu_base *cpu_base,
 	return expires_next;
 }
 
-static ktime_t __hrtimer_get_next_event(struct hrtimer_cpu_base *cpu_base)
+/*
+ * Recomputes cpu_base::*next_timer and returns the earliest expires_next but
+ * does not set cpu_base::*expires_next, that is done by hrtimer_reprogram.
+ *
+ * @active_mask must be one of:
+ *  - HRTIMER_ACTIVE,
+ *  - HRTIMER_ACTIVE_SOFT, or
+ *  - HRTIMER_ACTIVE_HARD.
+ */
+static ktime_t __hrtimer_get_next_event(struct hrtimer_cpu_base *cpu_base,
+					unsigned int active_mask)
 {
-	unsigned int active = cpu_base->active_bases;
+	unsigned int active;
 	ktime_t expires_next = KTIME_MAX;
 
 	cpu_base->next_timer = NULL;
 
+	active = cpu_base->active_bases & active_mask;
 	expires_next = __hrtimer_next_event_base(cpu_base, active, expires_next);
 
 	return expires_next;
@@ -553,7 +573,7 @@ hrtimer_force_reprogram(struct hrtimer_cpu_base *cpu_base, int skip_equal)
 {
 	ktime_t expires_next;
 
-	expires_next = __hrtimer_get_next_event(cpu_base);
+	expires_next = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_HARD);
 
 	if (skip_equal && expires_next == cpu_base->expires_next)
 		return;
@@ -1074,7 +1094,7 @@ u64 hrtimer_get_next_event(void)
 	raw_spin_lock_irqsave(&cpu_base->lock, flags);
 
 	if (!__hrtimer_hres_active(cpu_base))
-		expires = __hrtimer_get_next_event(cpu_base);
+		expires = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_HARD);
 
 	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
 
@@ -1248,10 +1268,10 @@ static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base,
 }
 
 static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now,
-				 unsigned long flags)
+				 unsigned long flags, unsigned int active_mask)
 {
 	struct hrtimer_clock_base *base;
-	unsigned int active = cpu_base->active_bases;
+	unsigned int active = cpu_base->active_bases & active_mask;
 
 	for_each_active_base(base, cpu_base, active) {
 		struct timerqueue_node *node;
@@ -1314,10 +1334,10 @@ void hrtimer_interrupt(struct clock_event_device *dev)
 	 */
 	cpu_base->expires_next = KTIME_MAX;
 
-	__hrtimer_run_queues(cpu_base, now, flags);
+	__hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_HARD);
 
 	/* Reevaluate the clock bases for the next expiry */
-	expires_next = __hrtimer_get_next_event(cpu_base);
+	expires_next = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_HARD);
 	/*
 	 * Store the new expiry value so the migration code can verify
 	 * against it.
@@ -1421,7 +1441,7 @@ void hrtimer_run_queues(void)
 
 	raw_spin_lock_irqsave(&cpu_base->lock, flags);
 	now = hrtimer_update_base(cpu_base);
-	__hrtimer_run_queues(cpu_base, now, flags);
+	__hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_HARD);
 	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
 }