1/*
2 * Copyright 2015 Advanced Micro Devices, Inc.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24
25/* The GPU load is measured as follows.
26 *
27 * There is a thread which samples the GRBM_STATUS register at a certain
28 * frequency and the "busy" or "idle" counter is incremented based on
29 * whether the GUI_ACTIVE bit is set or not.
30 *
31 * Then, the user can sample the counters twice and calculate the average
32 * GPU load between the two samples.
33 */
34
35#include "si_pipe.h"
36#include "si_query.h"
37#include "util/os_time.h"
38
39/* For good accuracy at 1000 fps or lower. This will be inaccurate for higher
40 * fps (there are too few samples per frame). */
41#define SAMPLES_PER_SEC 10000
42
43#define GRBM_STATUS   0x8010
44#define TA_BUSY(x)    (((x) >> 14) & 0x1)
45#define GDS_BUSY(x)   (((x) >> 15) & 0x1)
46#define VGT_BUSY(x)   (((x) >> 17) & 0x1)
47#define IA_BUSY(x)    (((x) >> 19) & 0x1)
48#define SX_BUSY(x)    (((x) >> 20) & 0x1)
49#define WD_BUSY(x)    (((x) >> 21) & 0x1)
50#define SPI_BUSY(x)   (((x) >> 22) & 0x1)
51#define BCI_BUSY(x)   (((x) >> 23) & 0x1)
52#define SC_BUSY(x)    (((x) >> 24) & 0x1)
53#define PA_BUSY(x)    (((x) >> 25) & 0x1)
54#define DB_BUSY(x)    (((x) >> 26) & 0x1)
55#define CP_BUSY(x)    (((x) >> 29) & 0x1)
56#define CB_BUSY(x)    (((x) >> 30) & 0x1)
57#define GUI_ACTIVE(x) (((x) >> 31) & 0x1)
58
59#define SRBM_STATUS2 0x0e4c
60#define SDMA_BUSY(x) (((x) >> 5) & 0x1)
61
62#define CP_STAT              0x8680
63#define PFP_BUSY(x)          (((x) >> 15) & 0x1)
64#define MEQ_BUSY(x)          (((x) >> 16) & 0x1)
65#define ME_BUSY(x)           (((x) >> 17) & 0x1)
66#define SURFACE_SYNC_BUSY(x) (((x) >> 21) & 0x1)
67#define DMA_BUSY(x)          (((x) >> 22) & 0x1)
68#define SCRATCH_RAM_BUSY(x)  (((x) >> 24) & 0x1)
69
70#define IDENTITY(x) x
71
72#define UPDATE_COUNTER(field, mask)                                                                \
73   do {                                                                                            \
74      if (mask(value))                                                                             \
75         p_atomic_inc(&counters->named.field.busy);                                                \
76      else                                                                                         \
77         p_atomic_inc(&counters->named.field.idle);                                                \
78   } while (0)
79
80static void si_update_mmio_counters(struct si_screen *sscreen, union si_mmio_counters *counters)
81{
82   uint32_t value = 0;
83   bool gui_busy, sdma_busy = false;
84
85   /* GRBM_STATUS */
86   sscreen->ws->read_registers(sscreen->ws, GRBM_STATUS, 1, &value);
87
88   UPDATE_COUNTER(ta, TA_BUSY);
89   UPDATE_COUNTER(gds, GDS_BUSY);
90   UPDATE_COUNTER(vgt, VGT_BUSY);
91   UPDATE_COUNTER(ia, IA_BUSY);
92   UPDATE_COUNTER(sx, SX_BUSY);
93   UPDATE_COUNTER(wd, WD_BUSY);
94   UPDATE_COUNTER(spi, SPI_BUSY);
95   UPDATE_COUNTER(bci, BCI_BUSY);
96   UPDATE_COUNTER(sc, SC_BUSY);
97   UPDATE_COUNTER(pa, PA_BUSY);
98   UPDATE_COUNTER(db, DB_BUSY);
99   UPDATE_COUNTER(cp, CP_BUSY);
100   UPDATE_COUNTER(cb, CB_BUSY);
101   UPDATE_COUNTER(gui, GUI_ACTIVE);
102   gui_busy = GUI_ACTIVE(value);
103
104   if (sscreen->info.gfx_level == GFX7 || sscreen->info.gfx_level == GFX8) {
105      /* SRBM_STATUS2 */
106      sscreen->ws->read_registers(sscreen->ws, SRBM_STATUS2, 1, &value);
107
108      UPDATE_COUNTER(sdma, SDMA_BUSY);
109      sdma_busy = SDMA_BUSY(value);
110   }
111
112   if (sscreen->info.gfx_level >= GFX8) {
113      /* CP_STAT */
114      sscreen->ws->read_registers(sscreen->ws, CP_STAT, 1, &value);
115
116      UPDATE_COUNTER(pfp, PFP_BUSY);
117      UPDATE_COUNTER(meq, MEQ_BUSY);
118      UPDATE_COUNTER(me, ME_BUSY);
119      UPDATE_COUNTER(surf_sync, SURFACE_SYNC_BUSY);
120      UPDATE_COUNTER(cp_dma, DMA_BUSY);
121      UPDATE_COUNTER(scratch_ram, SCRATCH_RAM_BUSY);
122   }
123
124   value = gui_busy || sdma_busy;
125   UPDATE_COUNTER(gpu, IDENTITY);
126}
127
128#undef UPDATE_COUNTER
129
130static int si_gpu_load_thread(void *param)
131{
132   struct si_screen *sscreen = (struct si_screen *)param;
133   const int period_us = 1000000 / SAMPLES_PER_SEC;
134   int sleep_us = period_us;
135   int64_t cur_time, last_time = os_time_get();
136
137   while (!p_atomic_read(&sscreen->gpu_load_stop_thread)) {
138      if (sleep_us)
139         os_time_sleep(sleep_us);
140
141      /* Make sure we sleep the ideal amount of time to match
142       * the expected frequency. */
143      cur_time = os_time_get();
144
145      if (os_time_timeout(last_time, last_time + period_us, cur_time))
146         sleep_us = MAX2(sleep_us - 1, 1);
147      else
148         sleep_us += 1;
149
150      /*printf("Hz: %.1f\n", 1000000.0 / (cur_time - last_time));*/
151      last_time = cur_time;
152
153      /* Update the counters. */
154      si_update_mmio_counters(sscreen, &sscreen->mmio_counters);
155   }
156   p_atomic_dec(&sscreen->gpu_load_stop_thread);
157   return 0;
158}
159
160void si_gpu_load_kill_thread(struct si_screen *sscreen)
161{
162   if (!sscreen->gpu_load_thread_created)
163      return;
164
165   p_atomic_inc(&sscreen->gpu_load_stop_thread);
166   thrd_join(sscreen->gpu_load_thread, NULL);
167   sscreen->gpu_load_thread_created = false;
168}
169
170static uint64_t si_read_mmio_counter(struct si_screen *sscreen, unsigned busy_index)
171{
172   /* Start the thread if needed. */
173   if (!sscreen->gpu_load_thread_created) {
174      simple_mtx_lock(&sscreen->gpu_load_mutex);
175      /* Check again inside the mutex. */
176      if (!sscreen->gpu_load_thread_created) {
177         if (thrd_success == u_thread_create(&sscreen->gpu_load_thread, si_gpu_load_thread, sscreen)) {
178            sscreen->gpu_load_thread_created = true;
179         }
180      }
181      simple_mtx_unlock(&sscreen->gpu_load_mutex);
182   }
183
184   unsigned busy = p_atomic_read(&sscreen->mmio_counters.array[busy_index]);
185   unsigned idle = p_atomic_read(&sscreen->mmio_counters.array[busy_index + 1]);
186
187   return busy | ((uint64_t)idle << 32);
188}
189
190static unsigned si_end_mmio_counter(struct si_screen *sscreen, uint64_t begin, unsigned busy_index)
191{
192   uint64_t end = si_read_mmio_counter(sscreen, busy_index);
193   unsigned busy = (end & 0xffffffff) - (begin & 0xffffffff);
194   unsigned idle = (end >> 32) - (begin >> 32);
195
196   /* Calculate the % of time the busy counter was being incremented.
197    *
198    * If no counters were incremented, return the current counter status.
199    * It's for the case when the load is queried faster than
200    * the counters are updated.
201    */
202   if (idle || busy) {
203      return busy * 100 / (busy + idle);
204   } else {
205      union si_mmio_counters counters;
206
207      memset(&counters, 0, sizeof(counters));
208      si_update_mmio_counters(sscreen, &counters);
209      return counters.array[busy_index] ? 100 : 0;
210   }
211}
212
213#define BUSY_INDEX(sscreen, field)                                                                 \
214   (&sscreen->mmio_counters.named.field.busy - sscreen->mmio_counters.array)
215
216static unsigned busy_index_from_type(struct si_screen *sscreen, unsigned type)
217{
218   switch (type) {
219   case SI_QUERY_GPU_LOAD:
220      return BUSY_INDEX(sscreen, gpu);
221   case SI_QUERY_GPU_SHADERS_BUSY:
222      return BUSY_INDEX(sscreen, spi);
223   case SI_QUERY_GPU_TA_BUSY:
224      return BUSY_INDEX(sscreen, ta);
225   case SI_QUERY_GPU_GDS_BUSY:
226      return BUSY_INDEX(sscreen, gds);
227   case SI_QUERY_GPU_VGT_BUSY:
228      return BUSY_INDEX(sscreen, vgt);
229   case SI_QUERY_GPU_IA_BUSY:
230      return BUSY_INDEX(sscreen, ia);
231   case SI_QUERY_GPU_SX_BUSY:
232      return BUSY_INDEX(sscreen, sx);
233   case SI_QUERY_GPU_WD_BUSY:
234      return BUSY_INDEX(sscreen, wd);
235   case SI_QUERY_GPU_BCI_BUSY:
236      return BUSY_INDEX(sscreen, bci);
237   case SI_QUERY_GPU_SC_BUSY:
238      return BUSY_INDEX(sscreen, sc);
239   case SI_QUERY_GPU_PA_BUSY:
240      return BUSY_INDEX(sscreen, pa);
241   case SI_QUERY_GPU_DB_BUSY:
242      return BUSY_INDEX(sscreen, db);
243   case SI_QUERY_GPU_CP_BUSY:
244      return BUSY_INDEX(sscreen, cp);
245   case SI_QUERY_GPU_CB_BUSY:
246      return BUSY_INDEX(sscreen, cb);
247   case SI_QUERY_GPU_SDMA_BUSY:
248      return BUSY_INDEX(sscreen, sdma);
249   case SI_QUERY_GPU_PFP_BUSY:
250      return BUSY_INDEX(sscreen, pfp);
251   case SI_QUERY_GPU_MEQ_BUSY:
252      return BUSY_INDEX(sscreen, meq);
253   case SI_QUERY_GPU_ME_BUSY:
254      return BUSY_INDEX(sscreen, me);
255   case SI_QUERY_GPU_SURF_SYNC_BUSY:
256      return BUSY_INDEX(sscreen, surf_sync);
257   case SI_QUERY_GPU_CP_DMA_BUSY:
258      return BUSY_INDEX(sscreen, cp_dma);
259   case SI_QUERY_GPU_SCRATCH_RAM_BUSY:
260      return BUSY_INDEX(sscreen, scratch_ram);
261   default:
262      unreachable("invalid query type");
263   }
264}
265
266uint64_t si_begin_counter(struct si_screen *sscreen, unsigned type)
267{
268   unsigned busy_index = busy_index_from_type(sscreen, type);
269   return si_read_mmio_counter(sscreen, busy_index);
270}
271
272unsigned si_end_counter(struct si_screen *sscreen, unsigned type, uint64_t begin)
273{
274   unsigned busy_index = busy_index_from_type(sscreen, type);
275   return si_end_mmio_counter(sscreen, begin, busy_index);
276}
277