src/gallium/drivers/r600/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 "util/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 SRBM_STATUS2            0x0e4c
  62 #define SDMA_BUSY(x)            (((x) >> 5) & 0x1)
  63
  64 #define CP_STAT                 0x8680
  65 #define PFP_BUSY(x)             (((x) >> 15) & 0x1)
  66 #define MEQ_BUSY(x)             (((x) >> 16) & 0x1)
  67 #define ME_BUSY(x)              (((x) >> 17) & 0x1)
  68 #define SURFACE_SYNC_BUSY(x)    (((x) >> 21) & 0x1)
  69 #define DMA_BUSY(x)             (((x) >> 22) & 0x1)
  70 #define SCRATCH_RAM_BUSY(x)     (((x) >> 24) & 0x1)
  71
  72 #define IDENTITY(x) x
  73
  74 #define UPDATE_COUNTER(field, mask)                                     \
  75         do {                                                            \
  76                 if (mask(value))                                        \
  77                         p_atomic_inc(&counters->named.field.busy);      \
  78                 else                                                    \
  79                         p_atomic_inc(&counters->named.field.idle);      \
  80         } while (0)
  81
  82 static void r600_update_mmio_counters(struct r600_common_screen *rscreen,
  83                                       union r600_mmio_counters *counters)
  84 {
  85         uint32_t value = 0;
  86         bool gui_busy, sdma_busy = false;
  87
  88         /* GRBM_STATUS */
  89         rscreen->ws->read_registers(rscreen->ws, GRBM_STATUS, 1, &value);
  90
  91         UPDATE_COUNTER(ta, TA_BUSY);
  92         UPDATE_COUNTER(gds, GDS_BUSY);
  93         UPDATE_COUNTER(vgt, VGT_BUSY);
  94         UPDATE_COUNTER(ia, IA_BUSY);
  95         UPDATE_COUNTER(sx, SX_BUSY);
  96         UPDATE_COUNTER(wd, WD_BUSY);
  97         UPDATE_COUNTER(spi, SPI_BUSY);
  98         UPDATE_COUNTER(bci, BCI_BUSY);
  99         UPDATE_COUNTER(sc, SC_BUSY);
 100         UPDATE_COUNTER(pa, PA_BUSY);
 101         UPDATE_COUNTER(db, DB_BUSY);
 102         UPDATE_COUNTER(cp, CP_BUSY);
 103         UPDATE_COUNTER(cb, CB_BUSY);
 104         UPDATE_COUNTER(gui, GUI_ACTIVE);
 105         gui_busy = GUI_ACTIVE(value);
 106
 107         value = gui_busy || sdma_busy;
 108         UPDATE_COUNTER(gpu, IDENTITY);
 109 }
 110
 111 #undef UPDATE_COUNTER
 112
 113 static int
 114 r600_gpu_load_thread(void *param)
 115 {
 116         struct r600_common_screen *rscreen = (struct r600_common_screen*)param;
 117         const int period_us = 1000000 / SAMPLES_PER_SEC;
 118         int sleep_us = period_us;
 119         int64_t cur_time, last_time = os_time_get();
 120
 121         while (!p_atomic_read(&rscreen->gpu_load_stop_thread)) {
 122                 if (sleep_us)
 123                         os_time_sleep(sleep_us);
 124
 125                 /* Make sure we sleep the ideal amount of time to match
 126                  * the expected frequency. */
 127                 cur_time = os_time_get();
 128
 129                 if (os_time_timeout(last_time, last_time + period_us,
 130                                     cur_time))
 131                         sleep_us = MAX2(sleep_us - 1, 1);
 132                 else
 133                         sleep_us += 1;
 134
 135                 /*printf("Hz: %.1f\n", 1000000.0 / (cur_time - last_time));*/
 136                 last_time = cur_time;
 137
 138                 /* Update the counters. */
 139                 r600_update_mmio_counters(rscreen, &rscreen->mmio_counters);
 140         }
 141         p_atomic_dec(&rscreen->gpu_load_stop_thread);
 142         return 0;
 143 }
 144
 145 void r600_gpu_load_kill_thread(struct r600_common_screen *rscreen)
 146 {
 147         if (!rscreen->gpu_load_thread)
 148                 return;
 149
 150         p_atomic_inc(&rscreen->gpu_load_stop_thread);
 151         thrd_join(rscreen->gpu_load_thread, NULL);
 152         rscreen->gpu_load_thread = 0;
 153 }
 154
 155 static uint64_t r600_read_mmio_counter(struct r600_common_screen *rscreen,
 156                                        unsigned busy_index)
 157 {
 158         /* Start the thread if needed. */
 159         if (!rscreen->gpu_load_thread) {
 160                 mtx_lock(&rscreen->gpu_load_mutex);
 161                 /* Check again inside the mutex. */
 162                 if (!rscreen->gpu_load_thread)
 163                         rscreen->gpu_load_thread =
 164                                 u_thread_create(r600_gpu_load_thread, rscreen);
 165                 mtx_unlock(&rscreen->gpu_load_mutex);
 166         }
 167
 168         unsigned busy = p_atomic_read(&rscreen->mmio_counters.array[busy_index]);
 169         unsigned idle = p_atomic_read(&rscreen->mmio_counters.array[busy_index + 1]);
 170
 171         return busy | ((uint64_t)idle << 32);
 172 }
 173
 174 static unsigned r600_end_mmio_counter(struct r600_common_screen *rscreen,
 175                                       uint64_t begin, unsigned busy_index)
 176 {
 177         uint64_t end = r600_read_mmio_counter(rscreen, busy_index);
 178         unsigned busy = (end & 0xffffffff) - (begin & 0xffffffff);
 179         unsigned idle = (end >> 32) - (begin >> 32);
 180
 181         /* Calculate the % of time the busy counter was being incremented.
 182          *
 183          * If no counters were incremented, return the current counter status.
 184          * It's for the case when the load is queried faster than
 185          * the counters are updated.
 186          */
 187         if (idle || busy) {
 188                 return busy*100 / (busy + idle);
 189         } else {
 190                 union r600_mmio_counters counters;
 191
 192                 memset(&counters, 0, sizeof(counters));
 193                 r600_update_mmio_counters(rscreen, &counters);
 194                 return counters.array[busy_index] ? 100 : 0;
 195         }
 196 }
 197
 198 #define BUSY_INDEX(rscreen, field) (&rscreen->mmio_counters.named.field.busy - \
 199                                     rscreen->mmio_counters.array)
 200
 201 static unsigned busy_index_from_type(struct r600_common_screen *rscreen,
 202                                      unsigned type)
 203 {
 204         switch (type) {
 205         case R600_QUERY_GPU_LOAD:
 206                 return BUSY_INDEX(rscreen, gpu);
 207         case R600_QUERY_GPU_SHADERS_BUSY:
 208                 return BUSY_INDEX(rscreen, spi);
 209         case R600_QUERY_GPU_TA_BUSY:
 210                 return BUSY_INDEX(rscreen, ta);
 211         case R600_QUERY_GPU_GDS_BUSY:
 212                 return BUSY_INDEX(rscreen, gds);
 213         case R600_QUERY_GPU_VGT_BUSY:
 214                 return BUSY_INDEX(rscreen, vgt);
 215         case R600_QUERY_GPU_IA_BUSY:
 216                 return BUSY_INDEX(rscreen, ia);
 217         case R600_QUERY_GPU_SX_BUSY:
 218                 return BUSY_INDEX(rscreen, sx);
 219         case R600_QUERY_GPU_WD_BUSY:
 220                 return BUSY_INDEX(rscreen, wd);
 221         case R600_QUERY_GPU_BCI_BUSY:
 222                 return BUSY_INDEX(rscreen, bci);
 223         case R600_QUERY_GPU_SC_BUSY:
 224                 return BUSY_INDEX(rscreen, sc);
 225         case R600_QUERY_GPU_PA_BUSY:
 226                 return BUSY_INDEX(rscreen, pa);
 227         case R600_QUERY_GPU_DB_BUSY:
 228                 return BUSY_INDEX(rscreen, db);
 229         case R600_QUERY_GPU_CP_BUSY:
 230                 return BUSY_INDEX(rscreen, cp);
 231         case R600_QUERY_GPU_CB_BUSY:
 232                 return BUSY_INDEX(rscreen, cb);
 233         case R600_QUERY_GPU_SDMA_BUSY:
 234                 return BUSY_INDEX(rscreen, sdma);
 235         case R600_QUERY_GPU_PFP_BUSY:
 236                 return BUSY_INDEX(rscreen, pfp);
 237         case R600_QUERY_GPU_MEQ_BUSY:
 238                 return BUSY_INDEX(rscreen, meq);
 239         case R600_QUERY_GPU_ME_BUSY:
 240                 return BUSY_INDEX(rscreen, me);
 241         case R600_QUERY_GPU_SURF_SYNC_BUSY:
 242                 return BUSY_INDEX(rscreen, surf_sync);
 243         case R600_QUERY_GPU_CP_DMA_BUSY:
 244                 return BUSY_INDEX(rscreen, cp_dma);
 245         case R600_QUERY_GPU_SCRATCH_RAM_BUSY:
 246                 return BUSY_INDEX(rscreen, scratch_ram);
 247         default:
 248                 unreachable("invalid query type");
 249         }
 250 }
 251
 252 uint64_t r600_begin_counter(struct r600_common_screen *rscreen, unsigned type)
 253 {
 254         unsigned busy_index = busy_index_from_type(rscreen, type);
 255         return r600_read_mmio_counter(rscreen, busy_index);
 256 }
 257
 258 unsigned r600_end_counter(struct r600_common_screen *rscreen, unsigned type,
 259                           uint64_t begin)
 260 {
 261         unsigned busy_index = busy_index_from_type(rscreen, type);
 262         return r600_end_mmio_counter(rscreen, begin, busy_index);
 263 }