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