1 /*
2 * Copyright 2020 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 */
22 #include <nvif/timer.h>
23 #include <nvif/device.h>
24
25 s64
nvif_timer_wait_test(struct nvif_timer_wait * wait)26 nvif_timer_wait_test(struct nvif_timer_wait *wait)
27 {
28 u64 time = nvif_device_time(wait->device);
29
30 if (wait->reads == 0) {
31 wait->time0 = time;
32 wait->time1 = time;
33 }
34
35 if (wait->time1 == time) {
36 if (WARN_ON(wait->reads++ == 16))
37 return -ETIMEDOUT;
38 } else {
39 wait->time1 = time;
40 wait->reads = 1;
41 }
42
43 if (wait->time1 - wait->time0 > wait->limit)
44 return -ETIMEDOUT;
45
46 return wait->time1 - wait->time0;
47 }
48
49 void
nvif_timer_wait_init(struct nvif_device * device,u64 nsec,struct nvif_timer_wait * wait)50 nvif_timer_wait_init(struct nvif_device *device, u64 nsec,
51 struct nvif_timer_wait *wait)
52 {
53 wait->device = device;
54 wait->limit = nsec;
55 wait->reads = 0;
56 }
57