src/gallium/drivers/radeon/r600_gpu_load.c

   1 /*
   2  * Copyright 2015 Advanced Micro Devices, 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 (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors: Marek Olšák <maraeo@gmail.com>
  24  *
  25  */
  26
  27 /* The GPU load is measured as follows.
  28  *
  29  * There is a thread which samples the GRBM_STATUS register at a certain
  30  * frequency and the "busy" or "idle" counter is incremented based on
  31  * whether the GUI_ACTIVE bit is set or not.
  32  *
  33  * Then, the user can sample the counters twice and calculate the average
  34  * GPU load between the two samples.
  35  */
  36
  37 #include "r600_pipe_common.h"
  38 #include "r600_query.h"
  39 #include "os/os_time.h"
  40
  41 /* For good accuracy at 1000 fps or lower. This will be inaccurate for higher
  42  * fps (there are too few samples per frame). */
  43 #define SAMPLES_PER_SEC 10000
  44
  45 #define GRBM_STATUS             0x8010
  46 #define TA_BUSY(x)              (((x) >> 14) & 0x1)
  47 #define GDS_BUSY(x)             (((x) >> 15) & 0x1)
  48 #define VGT_BUSY(x)             (((x) >> 17) & 0x1)
  49 #define IA_BUSY(x)              (((x) >> 19) & 0x1)
  50 #define SX_BUSY(x)              (((x) >> 20) & 0x1)
  51 #define WD_BUSY(x)              (((x) >> 21) & 0x1)
  52 #define SPI_BUSY(x)             (((x) >> 22) & 0x1)
  53 #define BCI_BUSY(x)             (((x) >> 23) & 0x1)
  54 #define SC_BUSY(x)              (((x) >> 24) & 0x1)
  55 #define PA_BUSY(x)              (((x) >> 25) & 0x1)
  56 #define DB_BUSY(x)              (((x) >> 26) & 0x1)
  57 #define CP_BUSY(x)              (((x) >> 29) & 0x1)
  58 #define CB_BUSY(x)              (((x) >> 30) & 0x1)
  59 #define GUI_ACTIVE(x)           (((x) >> 31) & 0x1)
  60
  61 #define UPDATE_COUNTER(field, mask)                             \
  62         if (mask(value))                                        \
  63                 p_atomic_inc(&counters->named.field.busy);      \
  64         else                                                    \
  65                 p_atomic_inc(&counters->named.field.idle);
  66
  67 static void r600_update_grbm_counters(struct r600_common_screen *rscreen,
  68                                       union r600_grbm_counters *counters)
  69 {
  70         uint32_t value = 0;
  71
  72         rscreen->ws->read_registers(rscreen->ws, GRBM_STATUS, 1, &value);
  73
  74         UPDATE_COUNTER(ta, TA_BUSY);
  75         UPDATE_COUNTER(gds, GDS_BUSY);
  76         UPDATE_COUNTER(vgt, VGT_BUSY);
  77         UPDATE_COUNTER(ia, IA_BUSY);
  78         UPDATE_COUNTER(sx, SX_BUSY);
  79         UPDATE_COUNTER(wd, WD_BUSY);
  80         UPDATE_COUNTER(spi, SPI_BUSY);
  81         UPDATE_COUNTER(bci, BCI_BUSY);
  82         UPDATE_COUNTER(sc, SC_BUSY);
  83         UPDATE_COUNTER(pa, PA_BUSY);
  84         UPDATE_COUNTER(db, DB_BUSY);
  85         UPDATE_COUNTER(cp, CP_BUSY);
  86         UPDATE_COUNTER(cb, CB_BUSY);
  87         UPDATE_COUNTER(gui, GUI_ACTIVE);
  88 }
  89
  90 static PIPE_THREAD_ROUTINE(r600_gpu_load_thread, param)
  91 {
  92         struct r600_common_screen *rscreen = (struct r600_common_screen*)param;
  93         const int period_us = 1000000 / SAMPLES_PER_SEC;
  94         int sleep_us = period_us;
  95         int64_t cur_time, last_time = os_time_get();
  96
  97         while (!p_atomic_read(&rscreen->gpu_load_stop_thread)) {
  98                 if (sleep_us)
  99                         os_time_sleep(sleep_us);
 100
 101                 /* Make sure we sleep the ideal amount of time to match
 102                  * the expected frequency. */
 103                 cur_time = os_time_get();
 104
 105                 if (os_time_timeout(last_time, last_time + period_us,
 106                                     cur_time))
 107                         sleep_us = MAX2(sleep_us - 1, 1);
 108                 else
 109                         sleep_us += 1;
 110
 111                 /*printf("Hz: %.1f\n", 1000000.0 / (cur_time - last_time));*/
 112                 last_time = cur_time;
 113
 114                 /* Update the counters. */
 115                 r600_update_grbm_counters(rscreen, &rscreen->grbm_counters);
 116         }
 117         p_atomic_dec(&rscreen->gpu_load_stop_thread);
 118         return 0;
 119 }
 120
 121 void r600_gpu_load_kill_thread(struct r600_common_screen *rscreen)
 122 {
 123         if (!rscreen->gpu_load_thread)
 124                 return;
 125
 126         p_atomic_inc(&rscreen->gpu_load_stop_thread);
 127         pipe_thread_wait(rscreen->gpu_load_thread);
 128         rscreen->gpu_load_thread = 0;
 129 }
 130
 131 static uint64_t r600_read_grbm_counter(struct r600_common_screen *rscreen,
 132                                        unsigned busy_index)
 133 {
 134         /* Start the thread if needed. */
 135         if (!rscreen->gpu_load_thread) {
 136                 pipe_mutex_lock(rscreen->gpu_load_mutex);
 137                 /* Check again inside the mutex. */
 138                 if (!rscreen->gpu_load_thread)
 139                         rscreen->gpu_load_thread =
 140                                 pipe_thread_create(r600_gpu_load_thread, rscreen);
 141                 pipe_mutex_unlock(rscreen->gpu_load_mutex);
 142         }
 143
 144         unsigned busy = p_atomic_read(&rscreen->grbm_counters.array[busy_index]);
 145         unsigned idle = p_atomic_read(&rscreen->grbm_counters.array[busy_index + 1]);
 146
 147         return busy | ((uint64_t)idle << 32);
 148 }
 149
 150 static unsigned r600_end_grbm_counter(struct r600_common_screen *rscreen,
 151                                       uint64_t begin, unsigned busy_index)
 152 {
 153         uint64_t end = r600_read_grbm_counter(rscreen, busy_index);
 154         unsigned busy = (end & 0xffffffff) - (begin & 0xffffffff);
 155         unsigned idle = (end >> 32) - (begin >> 32);
 156
 157         /* Calculate the % of time the busy counter was being incremented.
 158          *
 159          * If no counters were incremented, return the current counter status.
 160          * It's for the case when the load is queried faster than
 161          * the counters are updated.
 162          */
 163         if (idle || busy) {
 164                 return busy*100 / (busy + idle);
 165         } else {
 166                 union r600_grbm_counters counters;
 167
 168                 memset(&counters, 0, sizeof(counters));
 169                 r600_update_grbm_counters(rscreen, &counters);
 170                 return counters.array[busy_index] ? 100 : 0;
 171         }
 172 }
 173
 174 #define BUSY_INDEX(rscreen, field) (&rscreen->grbm_counters.named.field.busy - \
 175                                     rscreen->grbm_counters.array)
 176
 177 static unsigned busy_index_from_type(struct r600_common_screen *rscreen,
 178                                      unsigned type)
 179 {
 180         switch (type) {
 181         case R600_QUERY_GPU_LOAD:
 182                 return BUSY_INDEX(rscreen, gui);
 183         case R600_QUERY_GPU_SHADERS_BUSY:
 184                 return BUSY_INDEX(rscreen, spi);
 185         case R600_QUERY_GPU_TA_BUSY:
 186                 return BUSY_INDEX(rscreen, ta);
 187         case R600_QUERY_GPU_GDS_BUSY:
 188                 return BUSY_INDEX(rscreen, gds);
 189         case R600_QUERY_GPU_VGT_BUSY:
 190                 return BUSY_INDEX(rscreen, vgt);
 191         case R600_QUERY_GPU_IA_BUSY:
 192                 return BUSY_INDEX(rscreen, ia);
 193         case R600_QUERY_GPU_SX_BUSY:
 194                 return BUSY_INDEX(rscreen, sx);
 195         case R600_QUERY_GPU_WD_BUSY:
 196                 return BUSY_INDEX(rscreen, wd);
 197         case R600_QUERY_GPU_BCI_BUSY:
 198                 return BUSY_INDEX(rscreen, bci);
 199         case R600_QUERY_GPU_SC_BUSY:
 200                 return BUSY_INDEX(rscreen, sc);
 201         case R600_QUERY_GPU_PA_BUSY:
 202                 return BUSY_INDEX(rscreen, pa);
 203         case R600_QUERY_GPU_DB_BUSY:
 204                 return BUSY_INDEX(rscreen, db);
 205         case R600_QUERY_GPU_CP_BUSY:
 206                 return BUSY_INDEX(rscreen, cp);
 207         case R600_QUERY_GPU_CB_BUSY:
 208                 return BUSY_INDEX(rscreen, cb);
 209         default:
 210                 unreachable("query type does not correspond to grbm id");
 211         }
 212 }
 213
 214 uint64_t r600_begin_counter(struct r600_common_screen *rscreen, unsigned type)
 215 {
 216         unsigned busy_index = busy_index_from_type(rscreen, type);
 217         return r600_read_grbm_counter(rscreen, busy_index);
 218 }
 219
 220 unsigned r600_end_counter(struct r600_common_screen *rscreen, unsigned type,
 221                           uint64_t begin)
 222 {
 223         unsigned busy_index = busy_index_from_type(rscreen, type);
 224         return r600_end_grbm_counter(rscreen, begin, busy_index);
 225 }