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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5564 | serge | 1 | /* |
| 2 | * Copyright 2015 Advanced Micro Devices, 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 (including the next |
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| 12 | * paragraph) shall be included in all copies or substantial portions of the |
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| 13 | * Software. |
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| 14 | * |
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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| 21 | * SOFTWARE. |
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| 22 | * |
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| 23 | * Authors: Marek Olšák |
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| 24 | * |
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| 25 | */ |
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| 26 | |||
| 27 | /* The GPU load is measured as follows. |
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| 28 | * |
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| 29 | * There is a thread which samples the GRBM_STATUS register at a certain |
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| 30 | * frequency and the "busy" or "idle" counter is incremented based on |
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| 31 | * whether the GUI_ACTIVE bit is set or not. |
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| 32 | * |
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| 33 | * Then, the user can sample the counters twice and calculate the average |
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| 34 | * GPU load between the two samples. |
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| 35 | */ |
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| 36 | |||
| 37 | #include "r600_pipe_common.h" |
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| 38 | #include "os/os_time.h" |
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| 39 | |||
| 40 | /* For good accuracy at 1000 fps or lower. This will be inaccurate for higher |
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| 41 | * fps (there are too few samples per frame). */ |
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| 42 | #define SAMPLES_PER_SEC 10000 |
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| 43 | |||
| 44 | #define GRBM_STATUS 0x8010 |
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| 45 | #define GUI_ACTIVE(x) (((x) >> 31) & 0x1) |
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| 46 | |||
| 47 | static bool r600_is_gpu_busy(struct r600_common_screen *rscreen) |
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| 48 | { |
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| 49 | uint32_t value = 0; |
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| 50 | |||
| 51 | rscreen->ws->read_registers(rscreen->ws, GRBM_STATUS, 1, &value); |
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| 52 | return GUI_ACTIVE(value); |
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| 53 | } |
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| 54 | |||
| 55 | static PIPE_THREAD_ROUTINE(r600_gpu_load_thread, param) |
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| 56 | { |
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| 57 | struct r600_common_screen *rscreen = (struct r600_common_screen*)param; |
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| 58 | const int period_us = 1000000 / SAMPLES_PER_SEC; |
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| 59 | int sleep_us = period_us; |
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| 60 | int64_t cur_time, last_time = os_time_get(); |
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| 61 | |||
| 62 | while (!p_atomic_read(&rscreen->gpu_load_stop_thread)) { |
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| 63 | if (sleep_us) |
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| 64 | os_time_sleep(sleep_us); |
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| 65 | |||
| 66 | /* Make sure we sleep the ideal amount of time to match |
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| 67 | * the expected frequency. */ |
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| 68 | cur_time = os_time_get(); |
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| 69 | |||
| 70 | if (os_time_timeout(last_time, last_time + period_us, |
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| 71 | cur_time)) |
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| 72 | sleep_us = MAX2(sleep_us - 1, 1); |
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| 73 | else |
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| 74 | sleep_us += 1; |
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| 75 | |||
| 76 | /*printf("Hz: %.1f\n", 1000000.0 / (cur_time - last_time));*/ |
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| 77 | last_time = cur_time; |
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| 78 | |||
| 79 | /* Update the counters. */ |
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| 80 | if (r600_is_gpu_busy(rscreen)) |
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| 81 | p_atomic_inc(&rscreen->gpu_load_counter_busy); |
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| 82 | else |
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| 83 | p_atomic_inc(&rscreen->gpu_load_counter_idle); |
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| 84 | } |
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| 85 | p_atomic_dec(&rscreen->gpu_load_stop_thread); |
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| 86 | return 0; |
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| 87 | } |
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| 88 | |||
| 89 | void r600_gpu_load_kill_thread(struct r600_common_screen *rscreen) |
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| 90 | { |
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| 91 | if (!rscreen->gpu_load_thread) |
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| 92 | return; |
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| 93 | |||
| 94 | p_atomic_inc(&rscreen->gpu_load_stop_thread); |
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| 95 | pipe_thread_wait(rscreen->gpu_load_thread); |
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| 96 | rscreen->gpu_load_thread = 0; |
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| 97 | } |
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| 98 | |||
| 99 | static uint64_t r600_gpu_load_read_counter(struct r600_common_screen *rscreen) |
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| 100 | { |
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| 101 | /* Start the thread if needed. */ |
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| 102 | if (!rscreen->gpu_load_thread) { |
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| 103 | pipe_mutex_lock(rscreen->gpu_load_mutex); |
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| 104 | /* Check again inside the mutex. */ |
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| 105 | if (!rscreen->gpu_load_thread) |
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| 106 | rscreen->gpu_load_thread = |
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| 107 | pipe_thread_create(r600_gpu_load_thread, rscreen); |
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| 108 | pipe_mutex_unlock(rscreen->gpu_load_mutex); |
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| 109 | } |
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| 110 | |||
| 111 | /* The busy counter is in the lower 32 bits. |
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| 112 | * The idle counter is in the upper 32 bits. */ |
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| 113 | return p_atomic_read(&rscreen->gpu_load_counter_busy) | |
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| 114 | ((uint64_t)p_atomic_read(&rscreen->gpu_load_counter_idle) << 32); |
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| 115 | } |
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| 116 | |||
| 117 | /** |
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| 118 | * Just return the counters. |
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| 119 | */ |
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| 120 | uint64_t r600_gpu_load_begin(struct r600_common_screen *rscreen) |
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| 121 | { |
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| 122 | return r600_gpu_load_read_counter(rscreen); |
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| 123 | } |
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| 124 | |||
| 125 | unsigned r600_gpu_load_end(struct r600_common_screen *rscreen, uint64_t begin) |
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| 126 | { |
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| 127 | uint64_t end = r600_gpu_load_read_counter(rscreen); |
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| 128 | unsigned busy = (end & 0xffffffff) - (begin & 0xffffffff); |
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| 129 | unsigned idle = (end >> 32) - (begin >> 32); |
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| 130 | |||
| 131 | /* Calculate the GPU load. |
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| 132 | * |
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| 133 | * If no counters have been incremented, return the current load. |
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| 134 | * It's for the case when the load is queried faster than |
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| 135 | * the counters are updated. |
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| 136 | */ |
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| 137 | if (idle || busy) |
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| 138 | return busy*100 / (busy + idle); |
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| 139 | else |
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| 140 | return r600_is_gpu_busy(rscreen) ? 100 : 0; |
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| 141 | } |