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
si_update_mmio_counters(struct si_screen * sscreen,union si_mmio_counters * counters)80 static 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
si_gpu_load_thread(void * param)130 static 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
si_gpu_load_kill_thread(struct si_screen * sscreen)160 void 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
si_read_mmio_counter(struct si_screen * sscreen,unsigned busy_index)170 static 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
si_end_mmio_counter(struct si_screen * sscreen,uint64_t begin,unsigned busy_index)190 static 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
busy_index_from_type(struct si_screen * sscreen,unsigned type)216 static 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
si_begin_counter(struct si_screen * sscreen,unsigned type)266 uint64_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
si_end_counter(struct si_screen * sscreen,unsigned type,uint64_t begin)272 unsigned 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