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