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         do {                                                            \
  63                 if (mask(value))                                        \
  64                         p_atomic_inc(&counters->named.field.busy);      \
  65                 else                                                    \
  66                         p_atomic_inc(&counters->named.field.idle);      \
  67         } while (0)
  68
  69 static void r600_update_grbm_counters(struct r600_common_screen *rscreen,
  70                                       union r600_grbm_counters *counters)
  71 {
  72         uint32_t value = 0;
  73
  74         rscreen->ws->read_registers(rscreen->ws, GRBM_STATUS, 1, &value);
  75
  76         UPDATE_COUNTER(ta, TA_BUSY);
  77         UPDATE_COUNTER(gds, GDS_BUSY);
  78         UPDATE_COUNTER(vgt, VGT_BUSY);
  79         UPDATE_COUNTER(ia, IA_BUSY);
  80         UPDATE_COUNTER(sx, SX_BUSY);
  81         UPDATE_COUNTER(wd, WD_BUSY);
  82         UPDATE_COUNTER(spi, SPI_BUSY);
  83         UPDATE_COUNTER(bci, BCI_BUSY);
  84         UPDATE_COUNTER(sc, SC_BUSY);
  85         UPDATE_COUNTER(pa, PA_BUSY);
  86         UPDATE_COUNTER(db, DB_BUSY);
  87         UPDATE_COUNTER(cp, CP_BUSY);
  88         UPDATE_COUNTER(cb, CB_BUSY);
  89         UPDATE_COUNTER(gui, GUI_ACTIVE);
  90 }
  91
  92 #undef UPDATE_COUNTER
  93
  94 static PIPE_THREAD_ROUTINE(r600_gpu_load_thread, param)
  95 {
  96         struct r600_common_screen *rscreen = (struct r600_common_screen*)param;
  97         const int period_us = 1000000 / SAMPLES_PER_SEC;
  98         int sleep_us = period_us;
  99         int64_t cur_time, last_time = os_time_get();
 100
 101         while (!p_atomic_read(&rscreen->gpu_load_stop_thread)) {
 102                 if (sleep_us)
 103                         os_time_sleep(sleep_us);
 104
 105                 /* Make sure we sleep the ideal amount of time to match
 106                  * the expected frequency. */
 107                 cur_time = os_time_get();
 108
 109                 if (os_time_timeout(last_time, last_time + period_us,
 110                                     cur_time))
 111                         sleep_us = MAX2(sleep_us - 1, 1);
 112                 else
 113                         sleep_us += 1;
 114
 115                 /*printf("Hz: %.1f\n", 1000000.0 / (cur_time - last_time));*/
 116                 last_time = cur_time;
 117
 118                 /* Update the counters. */
 119                 r600_update_grbm_counters(rscreen, &rscreen->grbm_counters);
 120         }
 121         p_atomic_dec(&rscreen->gpu_load_stop_thread);
 122         return 0;
 123 }
 124
 125 void r600_gpu_load_kill_thread(struct r600_common_screen *rscreen)
 126 {
 127         if (!rscreen->gpu_load_thread)
 128                 return;
 129
 130         p_atomic_inc(&rscreen->gpu_load_stop_thread);
 131         pipe_thread_wait(rscreen->gpu_load_thread);
 132         rscreen->gpu_load_thread = 0;
 133 }
 134
 135 static uint64_t r600_read_grbm_counter(struct r600_common_screen *rscreen,
 136                                        unsigned busy_index)
 137 {
 138         /* Start the thread if needed. */
 139         if (!rscreen->gpu_load_thread) {
 140                 pipe_mutex_lock(rscreen->gpu_load_mutex);
 141                 /* Check again inside the mutex. */
 142                 if (!rscreen->gpu_load_thread)
 143                         rscreen->gpu_load_thread =
 144                                 pipe_thread_create(r600_gpu_load_thread, rscreen);
 145                 pipe_mutex_unlock(rscreen->gpu_load_mutex);
 146         }
 147
 148         unsigned busy = p_atomic_read(&rscreen->grbm_counters.array[busy_index]);
 149         unsigned idle = p_atomic_read(&rscreen->grbm_counters.array[busy_index + 1]);
 150
 151         return busy | ((uint64_t)idle << 32);
 152 }
 153
 154 static unsigned r600_end_grbm_counter(struct r600_common_screen *rscreen,
 155                                       uint64_t begin, unsigned busy_index)
 156 {
 157         uint64_t end = r600_read_grbm_counter(rscreen, busy_index);
 158         unsigned busy = (end & 0xffffffff) - (begin & 0xffffffff);
 159         unsigned idle = (end >> 32) - (begin >> 32);
 160
 161         /* Calculate the % of time the busy counter was being incremented.
 162          *
 163          * If no counters were incremented, return the current counter status.
 164          * It's for the case when the load is queried faster than
 165          * the counters are updated.
 166          */
 167         if (idle || busy) {
 168                 return busy*100 / (busy + idle);
 169         } else {
 170                 union r600_grbm_counters counters;
 171
 172                 memset(&counters, 0, sizeof(counters));
 173                 r600_update_grbm_counters(rscreen, &counters);
 174                 return counters.array[busy_index] ? 100 : 0;
 175         }
 176 }
 177
 178 #define BUSY_INDEX(rscreen, field) (&rscreen->grbm_counters.named.field.busy - \
 179                                     rscreen->grbm_counters.array)
 180
 181 static unsigned busy_index_from_type(struct r600_common_screen *rscreen,
 182                                      unsigned type)
 183 {
 184         switch (type) {
 185         case R600_QUERY_GPU_LOAD:
 186                 return BUSY_INDEX(rscreen, gui);
 187         case R600_QUERY_GPU_SHADERS_BUSY:
 188                 return BUSY_INDEX(rscreen, spi);
 189         case R600_QUERY_GPU_TA_BUSY:
 190                 return BUSY_INDEX(rscreen, ta);
 191         case R600_QUERY_GPU_GDS_BUSY:
 192                 return BUSY_INDEX(rscreen, gds);
 193         case R600_QUERY_GPU_VGT_BUSY:
 194                 return BUSY_INDEX(rscreen, vgt);
 195         case R600_QUERY_GPU_IA_BUSY:
 196                 return BUSY_INDEX(rscreen, ia);
 197         case R600_QUERY_GPU_SX_BUSY:
 198                 return BUSY_INDEX(rscreen, sx);
 199         case R600_QUERY_GPU_WD_BUSY:
 200                 return BUSY_INDEX(rscreen, wd);
 201         case R600_QUERY_GPU_BCI_BUSY:
 202                 return BUSY_INDEX(rscreen, bci);
 203         case R600_QUERY_GPU_SC_BUSY:
 204                 return BUSY_INDEX(rscreen, sc);
 205         case R600_QUERY_GPU_PA_BUSY:
 206                 return BUSY_INDEX(rscreen, pa);
 207         case R600_QUERY_GPU_DB_BUSY:
 208                 return BUSY_INDEX(rscreen, db);
 209         case R600_QUERY_GPU_CP_BUSY:
 210                 return BUSY_INDEX(rscreen, cp);
 211         case R600_QUERY_GPU_CB_BUSY:
 212                 return BUSY_INDEX(rscreen, cb);
 213         default:
 214                 unreachable("query type does not correspond to grbm id");
 215         }
 216 }
 217
 218 uint64_t r600_begin_counter(struct r600_common_screen *rscreen, unsigned type)
 219 {
 220         unsigned busy_index = busy_index_from_type(rscreen, type);
 221         return r600_read_grbm_counter(rscreen, busy_index);
 222 }
 223
 224 unsigned r600_end_counter(struct r600_common_screen *rscreen, unsigned type,
 225                           uint64_t begin)
 226 {
 227         unsigned busy_index = busy_index_from_type(rscreen, type);
 228         return r600_end_grbm_counter(rscreen, begin, busy_index);
 229 }