56d06fa29e
These are now specified directly in the MC subdev. Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
151 lines
4 KiB
C
151 lines
4 KiB
C
/*
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* Copyright 2012 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Ben Skeggs
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*/
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#include "priv.h"
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u64
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nvkm_timer_read(struct nvkm_timer *tmr)
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{
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return tmr->func->read(tmr);
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}
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void
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nvkm_timer_alarm_trigger(struct nvkm_timer *tmr)
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{
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struct nvkm_alarm *alarm, *atemp;
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unsigned long flags;
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LIST_HEAD(exec);
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/* move any due alarms off the pending list */
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spin_lock_irqsave(&tmr->lock, flags);
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list_for_each_entry_safe(alarm, atemp, &tmr->alarms, head) {
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if (alarm->timestamp <= nvkm_timer_read(tmr))
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list_move_tail(&alarm->head, &exec);
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}
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/* reschedule interrupt for next alarm time */
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if (!list_empty(&tmr->alarms)) {
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alarm = list_first_entry(&tmr->alarms, typeof(*alarm), head);
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tmr->func->alarm_init(tmr, alarm->timestamp);
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} else {
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tmr->func->alarm_fini(tmr);
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}
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spin_unlock_irqrestore(&tmr->lock, flags);
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/* execute any pending alarm handlers */
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list_for_each_entry_safe(alarm, atemp, &exec, head) {
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list_del_init(&alarm->head);
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alarm->func(alarm);
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}
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}
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void
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nvkm_timer_alarm(struct nvkm_timer *tmr, u32 nsec, struct nvkm_alarm *alarm)
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{
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struct nvkm_alarm *list;
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unsigned long flags;
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alarm->timestamp = nvkm_timer_read(tmr) + nsec;
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/* append new alarm to list, in soonest-alarm-first order */
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spin_lock_irqsave(&tmr->lock, flags);
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if (!nsec) {
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if (!list_empty(&alarm->head))
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list_del(&alarm->head);
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} else {
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list_for_each_entry(list, &tmr->alarms, head) {
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if (list->timestamp > alarm->timestamp)
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break;
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}
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list_add_tail(&alarm->head, &list->head);
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}
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spin_unlock_irqrestore(&tmr->lock, flags);
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/* process pending alarms */
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nvkm_timer_alarm_trigger(tmr);
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}
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void
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nvkm_timer_alarm_cancel(struct nvkm_timer *tmr, struct nvkm_alarm *alarm)
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{
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unsigned long flags;
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spin_lock_irqsave(&tmr->lock, flags);
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list_del_init(&alarm->head);
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spin_unlock_irqrestore(&tmr->lock, flags);
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}
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static void
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nvkm_timer_intr(struct nvkm_subdev *subdev)
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{
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struct nvkm_timer *tmr = nvkm_timer(subdev);
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tmr->func->intr(tmr);
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}
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static int
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nvkm_timer_fini(struct nvkm_subdev *subdev, bool suspend)
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{
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struct nvkm_timer *tmr = nvkm_timer(subdev);
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tmr->func->alarm_fini(tmr);
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return 0;
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}
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static int
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nvkm_timer_init(struct nvkm_subdev *subdev)
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{
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struct nvkm_timer *tmr = nvkm_timer(subdev);
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if (tmr->func->init)
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tmr->func->init(tmr);
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tmr->func->time(tmr, ktime_to_ns(ktime_get()));
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nvkm_timer_alarm_trigger(tmr);
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return 0;
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}
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static void *
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nvkm_timer_dtor(struct nvkm_subdev *subdev)
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{
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return nvkm_timer(subdev);
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}
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static const struct nvkm_subdev_func
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nvkm_timer = {
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.dtor = nvkm_timer_dtor,
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.init = nvkm_timer_init,
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.fini = nvkm_timer_fini,
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.intr = nvkm_timer_intr,
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};
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int
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nvkm_timer_new_(const struct nvkm_timer_func *func, struct nvkm_device *device,
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int index, struct nvkm_timer **ptmr)
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{
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struct nvkm_timer *tmr;
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if (!(tmr = *ptmr = kzalloc(sizeof(*tmr), GFP_KERNEL)))
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return -ENOMEM;
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nvkm_subdev_ctor(&nvkm_timer, device, index, &tmr->subdev);
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tmr->func = func;
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INIT_LIST_HEAD(&tmr->alarms);
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spin_lock_init(&tmr->lock);
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return 0;
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}
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