57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
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/*
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* Copyright 2020 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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#include <nvif/timer.h>
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#include <nvif/device.h>
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s64
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nvif_timer_wait_test(struct nvif_timer_wait *wait)
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{
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u64 time = nvif_device_time(wait->device);
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if (wait->reads == 0) {
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wait->time0 = time;
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wait->time1 = time;
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}
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if (wait->time1 == time) {
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if (WARN_ON(wait->reads++ == 16))
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return -ETIMEDOUT;
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} else {
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wait->time1 = time;
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wait->reads = 1;
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}
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if (wait->time1 - wait->time0 > wait->limit)
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return -ETIMEDOUT;
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return wait->time1 - wait->time0;
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}
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void
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nvif_timer_wait_init(struct nvif_device *device, u64 nsec,
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struct nvif_timer_wait *wait)
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{
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wait->device = device;
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wait->limit = nsec;
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wait->reads = 0;
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}
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