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/*
* Copyright 2020 Red Hat Inc.
*
* 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
*/
#include <nvif/timer.h>
#include <nvif/device.h>
s64
nvif_timer_wait_test(struct nvif_timer_wait *wait)
{
u64 time = nvif_device_time(wait->device);
if (wait->reads == 0) {
wait->time0 = time;
wait->time1 = time;
}
if (wait->time1 == time) {
if (WARN_ON(wait->reads++ == 16))
return -ETIMEDOUT;
} else {
wait->time1 = time;
wait->reads = 1;
}
if (wait->time1 - wait->time0 > wait->limit)
return -ETIMEDOUT;
return wait->time1 - wait->time0;
}
void
nvif_timer_wait_init(struct nvif_device *device, u64 nsec,
struct nvif_timer_wait *wait)
{
wait->device = device;
wait->limit = nsec;
wait->reads = 0;
}
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