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 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 #define CE_BUSY(x)              (((x) >> 26) & 0x1)
  72
  73 #define UPDATE_COUNTER(field, mask)                                     \
  74         do {                                                            \
  75                 if (mask(value))                                        \
  76                         p_atomic_inc(&counters->named.field.busy);      \
  77                 else                                                    \
  78                         p_atomic_inc(&counters->named.field.idle);      \
  79         } while (0)
  80
  81 static void r600_update_mmio_counters(struct r600_common_screen *rscreen,
  82                                       union r600_mmio_counters *counters)
  83 {
  84         uint32_t value = 0;
  85
  86         /* GRBM_STATUS */
  87         rscreen->ws->read_registers(rscreen->ws, GRBM_STATUS, 1, &value);
  88
  89         UPDATE_COUNTER(ta, TA_BUSY);
  90         UPDATE_COUNTER(gds, GDS_BUSY);
  91         UPDATE_COUNTER(vgt, VGT_BUSY);
  92         UPDATE_COUNTER(ia, IA_BUSY);
  93         UPDATE_COUNTER(sx, SX_BUSY);
  94         UPDATE_COUNTER(wd, WD_BUSY);
  95         UPDATE_COUNTER(spi, SPI_BUSY);
  96         UPDATE_COUNTER(bci, BCI_BUSY);
  97         UPDATE_COUNTER(sc, SC_BUSY);
  98         UPDATE_COUNTER(pa, PA_BUSY);
  99         UPDATE_COUNTER(db, DB_BUSY);
 100         UPDATE_COUNTER(cp, CP_BUSY);
 101         UPDATE_COUNTER(cb, CB_BUSY);
 102         UPDATE_COUNTER(gui, GUI_ACTIVE);
 103
 104         if (rscreen->chip_class >= EVERGREEN) {
 105                 /* SRBM_STATUS2 */
 106                 rscreen->ws->read_registers(rscreen->ws, SRBM_STATUS2, 1, &value);
 107
 108                 UPDATE_COUNTER(sdma, SDMA_BUSY);
 109         }
 110
 111         if (rscreen->chip_class >= VI) {
 112                 /* CP_STAT */
 113                 rscreen->ws->read_registers(rscreen->ws, CP_STAT, 1, &value);
 114
 115                 UPDATE_COUNTER(pfp, PFP_BUSY);
 116                 UPDATE_COUNTER(meq, MEQ_BUSY);
 117                 UPDATE_COUNTER(me, ME_BUSY);
 118                 UPDATE_COUNTER(surf_sync, SURFACE_SYNC_BUSY);
 119                 UPDATE_COUNTER(dma, DMA_BUSY);
 120                 UPDATE_COUNTER(scratch_ram, SCRATCH_RAM_BUSY);
 121                 UPDATE_COUNTER(ce, CE_BUSY);
 122         }
 123 }
 124
 125 #undef UPDATE_COUNTER
 126
 127 static PIPE_THREAD_ROUTINE(r600_gpu_load_thread, param)
 128 {
 129         struct r600_common_screen *rscreen = (struct r600_common_screen*)param;
 130         const int period_us = 1000000 / SAMPLES_PER_SEC;
 131         int sleep_us = period_us;
 132         int64_t cur_time, last_time = os_time_get();
 133
 134         while (!p_atomic_read(&rscreen->gpu_load_stop_thread)) {
 135                 if (sleep_us)
 136                         os_time_sleep(sleep_us);
 137
 138                 /* Make sure we sleep the ideal amount of time to match
 139                  * the expected frequency. */
 140                 cur_time = os_time_get();
 141
 142                 if (os_time_timeout(last_time, last_time + period_us,
 143                                     cur_time))
 144                         sleep_us = MAX2(sleep_us - 1, 1);
 145                 else
 146                         sleep_us += 1;
 147
 148                 /*printf("Hz: %.1f\n", 1000000.0 / (cur_time - last_time));*/
 149                 last_time = cur_time;
 150
 151                 /* Update the counters. */
 152                 r600_update_mmio_counters(rscreen, &rscreen->mmio_counters);
 153         }
 154         p_atomic_dec(&rscreen->gpu_load_stop_thread);
 155         return 0;
 156 }
 157
 158 void r600_gpu_load_kill_thread(struct r600_common_screen *rscreen)
 159 {
 160         if (!rscreen->gpu_load_thread)
 161                 return;
 162
 163         p_atomic_inc(&rscreen->gpu_load_stop_thread);
 164         pipe_thread_wait(rscreen->gpu_load_thread);
 165         rscreen->gpu_load_thread = 0;
 166 }
 167
 168 static uint64_t r600_read_mmio_counter(struct r600_common_screen *rscreen,
 169                                        unsigned busy_index)
 170 {
 171         /* Start the thread if needed. */
 172         if (!rscreen->gpu_load_thread) {
 173                 pipe_mutex_lock(rscreen->gpu_load_mutex);
 174                 /* Check again inside the mutex. */
 175                 if (!rscreen->gpu_load_thread)
 176                         rscreen->gpu_load_thread =
 177                                 pipe_thread_create(r600_gpu_load_thread, rscreen);
 178                 pipe_mutex_unlock(rscreen->gpu_load_mutex);
 179         }
 180
 181         unsigned busy = p_atomic_read(&rscreen->mmio_counters.array[busy_index]);
 182         unsigned idle = p_atomic_read(&rscreen->mmio_counters.array[busy_index + 1]);
 183
 184         return busy | ((uint64_t)idle << 32);
 185 }
 186
 187 static unsigned r600_end_mmio_counter(struct r600_common_screen *rscreen,
 188                                       uint64_t begin, unsigned busy_index)
 189 {
 190         uint64_t end = r600_read_mmio_counter(rscreen, busy_index);
 191         unsigned busy = (end & 0xffffffff) - (begin & 0xffffffff);
 192         unsigned idle = (end >> 32) - (begin >> 32);
 193
 194         /* Calculate the % of time the busy counter was being incremented.
 195          *
 196          * If no counters were incremented, return the current counter status.
 197          * It's for the case when the load is queried faster than
 198          * the counters are updated.
 199          */
 200         if (idle || busy) {
 201                 return busy*100 / (busy + idle);
 202         } else {
 203                 union r600_mmio_counters counters;
 204
 205                 memset(&counters, 0, sizeof(counters));
 206                 r600_update_mmio_counters(rscreen, &counters);
 207                 return counters.array[busy_index] ? 100 : 0;
 208         }
 209 }
 210
 211 #define BUSY_INDEX(rscreen, field) (&rscreen->mmio_counters.named.field.busy - \
 212                                     rscreen->mmio_counters.array)
 213
 214 static unsigned busy_index_from_type(struct r600_common_screen *rscreen,
 215                                      unsigned type)
 216 {
 217         switch (type) {
 218         case R600_QUERY_GPU_LOAD:
 219                 return BUSY_INDEX(rscreen, gui);
 220         case R600_QUERY_GPU_SHADERS_BUSY:
 221                 return BUSY_INDEX(rscreen, spi);
 222         case R600_QUERY_GPU_TA_BUSY:
 223                 return BUSY_INDEX(rscreen, ta);
 224         case R600_QUERY_GPU_GDS_BUSY:
 225                 return BUSY_INDEX(rscreen, gds);
 226         case R600_QUERY_GPU_VGT_BUSY:
 227                 return BUSY_INDEX(rscreen, vgt);
 228         case R600_QUERY_GPU_IA_BUSY:
 229                 return BUSY_INDEX(rscreen, ia);
 230         case R600_QUERY_GPU_SX_BUSY:
 231                 return BUSY_INDEX(rscreen, sx);
 232         case R600_QUERY_GPU_WD_BUSY:
 233                 return BUSY_INDEX(rscreen, wd);
 234         case R600_QUERY_GPU_BCI_BUSY:
 235                 return BUSY_INDEX(rscreen, bci);
 236         case R600_QUERY_GPU_SC_BUSY:
 237                 return BUSY_INDEX(rscreen, sc);
 238         case R600_QUERY_GPU_PA_BUSY:
 239                 return BUSY_INDEX(rscreen, pa);
 240         case R600_QUERY_GPU_DB_BUSY:
 241                 return BUSY_INDEX(rscreen, db);
 242         case R600_QUERY_GPU_CP_BUSY:
 243                 return BUSY_INDEX(rscreen, cp);
 244         case R600_QUERY_GPU_CB_BUSY:
 245                 return BUSY_INDEX(rscreen, cb);
 246         case R600_QUERY_GPU_SDMA_BUSY:
 247                 return BUSY_INDEX(rscreen, sdma);
 248         case R600_QUERY_GPU_PFP_BUSY:
 249                 return BUSY_INDEX(rscreen, pfp);
 250         case R600_QUERY_GPU_MEQ_BUSY:
 251                 return BUSY_INDEX(rscreen, meq);
 252         case R600_QUERY_GPU_ME_BUSY:
 253                 return BUSY_INDEX(rscreen, me);
 254         case R600_QUERY_GPU_SURF_SYNC_BUSY:
 255                 return BUSY_INDEX(rscreen, surf_sync);
 256         case R600_QUERY_GPU_DMA_BUSY:
 257                 return BUSY_INDEX(rscreen, dma);
 258         case R600_QUERY_GPU_SCRATCH_RAM_BUSY:
 259                 return BUSY_INDEX(rscreen, scratch_ram);
 260         case R600_QUERY_GPU_CE_BUSY:
 261                 return BUSY_INDEX(rscreen, ce);
 262         default:
 263                 unreachable("invalid query type");
 264         }
 265 }
 266
 267 uint64_t r600_begin_counter(struct r600_common_screen *rscreen, unsigned type)
 268 {
 269         unsigned busy_index = busy_index_from_type(rscreen, type);
 270         return r600_read_mmio_counter(rscreen, busy_index);
 271 }
 272
 273 unsigned r600_end_counter(struct r600_common_screen *rscreen, unsigned type,
 274                           uint64_t begin)
 275 {
 276         unsigned busy_index = busy_index_from_type(rscreen, type);
 277         return r600_end_mmio_counter(rscreen, begin, busy_index);
 278 }