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/*
* Copyright (c) 2006, 2012, Oracle and/or its affiliates. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/*
* Copyright (c) 2012 Intel Corporation. All rights reserved.
*/
#include "drm_sun_timer.h"
void
init_timer(struct timer_list *timer)
{
mutex_init(&timer->lock, NULL, MUTEX_DRIVER, NULL);
}
void
destroy_timer(struct timer_list *timer)
{
mutex_destroy(&timer->lock);
}
void
setup_timer(struct timer_list *timer, void (*func)(void *), void *arg)
{
timer->func = func;
timer->arg = arg;
timer->expired_time = 0;
}
void
mod_timer(struct timer_list *timer, clock_t expires)
{
mutex_enter(&timer->lock);
/*
* If timer is already being updated, let previous caller do the work
* Note that we must drop timer->lock before the untimeout, as the
* callback might call mod_timer and deadlock. So the guard is
* centered around the overloading of the timer->expires element.
*/
if (timer->expires == -1) {
mutex_exit(&timer->lock);
return;
}
timer->expires = -1;
mutex_exit(&timer->lock);
(void) untimeout(timer->timer_id);
timer->expired_time = jiffies + expires;
timer->timer_id = timeout(timer->func, timer->arg, expires);
mutex_enter(&timer->lock);
timer->expires = 0;
mutex_exit(&timer->lock);
}
void
del_timer(struct timer_list *timer)
{
(void) untimeout(timer->timer_id);
}
void
test_set_timer(struct timer_list *timer, clock_t expires)
{
if (time_after(jiffies, timer->expired_time)) {
timer->expired_time = jiffies + expires;
timer->timer_id = timeout(timer->func, timer->arg, expires);
}
}
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