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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 <anna-maria@linutronix.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: keescook@chromium.org
Link: http://lkml.kernel.org/r/20171221104205.7269-28-anna-maria@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Anna-Maria Gleixner 2017-12-21 11:41:56 +01:00 committed by Ingo Molnar
parent 98ecadd430
commit c458b1d102
1 changed files with 29 additions and 9 deletions
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38
kernel/time/hrtimer.c
View File

@ -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 @@ retry:
*/
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);
}