2 * Copyright © 2008 Intel Corporation
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:
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
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
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
28 /** @file brw_queryobj.c
30 * Support for query objects (GL_ARB_occlusion_query, GL_ARB_timer_query,
31 * GL_EXT_transform_feedback, and friends).
33 * The hardware provides a PIPE_CONTROL command that can report the number of
34 * fragments that passed the depth test, or the hardware timer. They are
35 * appropriately synced with the stage of the pipeline for our extensions'
38 #include "main/imports.h"
40 #include "brw_context.h"
41 #include "brw_defines.h"
42 #include "brw_state.h"
43 #include "intel_batchbuffer.h"
46 * Emit PIPE_CONTROLs to write the current GPU timestamp into a buffer.
49 brw_write_timestamp(struct brw_context
*brw
, drm_intel_bo
*query_bo
, int idx
)
52 /* Emit Sandybridge workaround flush: */
53 brw_emit_pipe_control_flush(brw
,
54 PIPE_CONTROL_CS_STALL
|
55 PIPE_CONTROL_STALL_AT_SCOREBOARD
);
58 uint32_t flags
= PIPE_CONTROL_WRITE_TIMESTAMP
;
60 if (brw
->gen
== 9 && brw
->gt
== 4)
61 flags
|= PIPE_CONTROL_CS_STALL
;
63 brw_emit_pipe_control_write(brw
, flags
,
64 query_bo
, idx
* sizeof(uint64_t), 0, 0);
68 * Emit PIPE_CONTROLs to write the PS_DEPTH_COUNT register into a buffer.
71 brw_write_depth_count(struct brw_context
*brw
, drm_intel_bo
*query_bo
, int idx
)
73 uint32_t flags
= PIPE_CONTROL_WRITE_DEPTH_COUNT
| PIPE_CONTROL_DEPTH_STALL
;
75 if (brw
->gen
== 9 && brw
->gt
== 4)
76 flags
|= PIPE_CONTROL_CS_STALL
;
78 brw_emit_pipe_control_write(brw
, flags
,
79 query_bo
, idx
* sizeof(uint64_t),
84 * Wait on the query object's BO and calculate the final result.
87 brw_queryobj_get_results(struct gl_context
*ctx
,
88 struct brw_query_object
*query
)
90 struct brw_context
*brw
= brw_context(ctx
);
97 if (query
->bo
== NULL
)
100 /* If the application has requested the query result, but this batch is
101 * still contributing to it, flush it now so the results will be present
104 if (drm_intel_bo_references(brw
->batch
.bo
, query
->bo
))
105 intel_batchbuffer_flush(brw
);
107 if (unlikely(brw
->perf_debug
)) {
108 if (drm_intel_bo_busy(query
->bo
)) {
109 perf_debug("Stalling on the GPU waiting for a query object.\n");
113 drm_intel_bo_map(query
->bo
, false);
114 results
= query
->bo
->virtual;
115 switch (query
->Base
.Target
) {
116 case GL_TIME_ELAPSED_EXT
:
117 /* The query BO contains the starting and ending timestamps.
118 * Subtract the two and convert to nanoseconds.
120 query
->Base
.Result
+= 1000 * ((results
[1] >> 32) - (results
[0] >> 32));
124 /* The query BO contains a single timestamp value in results[0]. */
125 query
->Base
.Result
= 1000 * (results
[0] >> 32);
128 case GL_SAMPLES_PASSED_ARB
:
129 /* Loop over pairs of values from the BO, which are the PS_DEPTH_COUNT
130 * value at the start and end of the batchbuffer. Subtract them to
131 * get the number of fragments which passed the depth test in each
132 * individual batch, and add those differences up to get the number
133 * of fragments for the entire query.
135 * Note that query->Base.Result may already be non-zero. We may have
136 * run out of space in the query's BO and allocated a new one. If so,
137 * this function was already called to accumulate the results so far.
139 for (i
= 0; i
< query
->last_index
; i
++) {
140 query
->Base
.Result
+= results
[i
* 2 + 1] - results
[i
* 2];
144 case GL_ANY_SAMPLES_PASSED
:
145 case GL_ANY_SAMPLES_PASSED_CONSERVATIVE
:
146 /* If the starting and ending PS_DEPTH_COUNT from any of the batches
147 * differ, then some fragments passed the depth test.
149 for (i
= 0; i
< query
->last_index
; i
++) {
150 if (results
[i
* 2 + 1] != results
[i
* 2]) {
151 query
->Base
.Result
= GL_TRUE
;
158 unreachable("Unrecognized query target in brw_queryobj_get_results()");
160 drm_intel_bo_unmap(query
->bo
);
162 /* Now that we've processed the data stored in the query's buffer object,
165 drm_intel_bo_unreference(query
->bo
);
170 * The NewQueryObject() driver hook.
172 * Allocates and initializes a new query object.
174 static struct gl_query_object
*
175 brw_new_query_object(struct gl_context
*ctx
, GLuint id
)
177 struct brw_query_object
*query
;
179 query
= calloc(1, sizeof(struct brw_query_object
));
182 query
->Base
.Result
= 0;
183 query
->Base
.Active
= false;
184 query
->Base
.Ready
= true;
190 * The DeleteQuery() driver hook.
193 brw_delete_query(struct gl_context
*ctx
, struct gl_query_object
*q
)
195 struct brw_query_object
*query
= (struct brw_query_object
*)q
;
197 drm_intel_bo_unreference(query
->bo
);
202 * Gen4-5 driver hook for glBeginQuery().
204 * Initializes driver structures and emits any GPU commands required to begin
205 * recording data for the query.
208 brw_begin_query(struct gl_context
*ctx
, struct gl_query_object
*q
)
210 struct brw_context
*brw
= brw_context(ctx
);
211 struct brw_query_object
*query
= (struct brw_query_object
*)q
;
213 assert(brw
->gen
< 6);
215 switch (query
->Base
.Target
) {
216 case GL_TIME_ELAPSED_EXT
:
217 /* For timestamp queries, we record the starting time right away so that
218 * we measure the full time between BeginQuery and EndQuery. There's
219 * some debate about whether this is the right thing to do. Our decision
220 * is based on the following text from the ARB_timer_query extension:
222 * "(5) Should the extension measure total time elapsed between the full
223 * completion of the BeginQuery and EndQuery commands, or just time
224 * spent in the graphics library?
226 * RESOLVED: This extension will measure the total time elapsed
227 * between the full completion of these commands. Future extensions
228 * may implement a query to determine time elapsed at different stages
229 * of the graphics pipeline."
231 * We write a starting timestamp now (at index 0). At EndQuery() time,
232 * we'll write a second timestamp (at index 1), and subtract the two to
233 * obtain the time elapsed. Notably, this includes time elapsed while
234 * the system was doing other work, such as running other applications.
236 drm_intel_bo_unreference(query
->bo
);
237 query
->bo
= drm_intel_bo_alloc(brw
->bufmgr
, "timer query", 4096, 4096);
238 brw_write_timestamp(brw
, query
->bo
, 0);
241 case GL_ANY_SAMPLES_PASSED
:
242 case GL_ANY_SAMPLES_PASSED_CONSERVATIVE
:
243 case GL_SAMPLES_PASSED_ARB
:
244 /* For occlusion queries, we delay taking an initial sample until the
245 * first drawing occurs in this batch. See the reasoning in the comments
246 * for brw_emit_query_begin() below.
248 * Since we're starting a new query, we need to be sure to throw away
249 * any previous occlusion query results.
251 drm_intel_bo_unreference(query
->bo
);
253 query
->last_index
= -1;
255 brw
->query
.obj
= query
;
257 /* Depth statistics on Gen4 require strange workarounds, so we try to
258 * avoid them when necessary. They're required for occlusion queries,
259 * so turn them on now.
262 brw
->ctx
.NewDriverState
|= BRW_NEW_STATS_WM
;
266 unreachable("Unrecognized query target in brw_begin_query()");
271 * Gen4-5 driver hook for glEndQuery().
273 * Emits GPU commands to record a final query value, ending any data capturing.
274 * However, the final result isn't necessarily available until the GPU processes
275 * those commands. brw_queryobj_get_results() processes the captured data to
276 * produce the final result.
279 brw_end_query(struct gl_context
*ctx
, struct gl_query_object
*q
)
281 struct brw_context
*brw
= brw_context(ctx
);
282 struct brw_query_object
*query
= (struct brw_query_object
*)q
;
284 assert(brw
->gen
< 6);
286 switch (query
->Base
.Target
) {
287 case GL_TIME_ELAPSED_EXT
:
288 /* Write the final timestamp. */
289 brw_write_timestamp(brw
, query
->bo
, 1);
292 case GL_ANY_SAMPLES_PASSED
:
293 case GL_ANY_SAMPLES_PASSED_CONSERVATIVE
:
294 case GL_SAMPLES_PASSED_ARB
:
296 /* No query->bo means that EndQuery was called after BeginQuery with no
297 * intervening drawing. Rather than doing nothing at all here in this
298 * case, we emit the query_begin and query_end state to the
299 * hardware. This is to guarantee that waiting on the result of this
300 * empty state will cause all previous queries to complete at all, as
301 * required by the specification:
303 * It must always be true that if any query object
304 * returns a result available of TRUE, all queries of the
305 * same type issued prior to that query must also return
306 * TRUE. [Open GL 4.3 (Core Profile) Section 4.2.1]
309 brw_emit_query_begin(brw
);
314 brw_emit_query_end(brw
);
316 brw
->query
.obj
= NULL
;
319 brw
->ctx
.NewDriverState
|= BRW_NEW_STATS_WM
;
323 unreachable("Unrecognized query target in brw_end_query()");
328 * The Gen4-5 WaitQuery() driver hook.
330 * Wait for a query result to become available and return it. This is the
331 * backing for glGetQueryObjectiv() with the GL_QUERY_RESULT pname.
333 static void brw_wait_query(struct gl_context
*ctx
, struct gl_query_object
*q
)
335 struct brw_query_object
*query
= (struct brw_query_object
*)q
;
337 assert(brw_context(ctx
)->gen
< 6);
339 brw_queryobj_get_results(ctx
, query
);
340 query
->Base
.Ready
= true;
344 * The Gen4-5 CheckQuery() driver hook.
346 * Checks whether a query result is ready yet. If not, flushes.
347 * This is the backing for glGetQueryObjectiv()'s QUERY_RESULT_AVAILABLE pname.
349 static void brw_check_query(struct gl_context
*ctx
, struct gl_query_object
*q
)
351 struct brw_context
*brw
= brw_context(ctx
);
352 struct brw_query_object
*query
= (struct brw_query_object
*)q
;
354 assert(brw
->gen
< 6);
356 /* From the GL_ARB_occlusion_query spec:
358 * "Instead of allowing for an infinite loop, performing a
359 * QUERY_RESULT_AVAILABLE_ARB will perform a flush if the result is
360 * not ready yet on the first time it is queried. This ensures that
361 * the async query will return true in finite time.
363 if (query
->bo
&& drm_intel_bo_references(brw
->batch
.bo
, query
->bo
))
364 intel_batchbuffer_flush(brw
);
366 if (query
->bo
== NULL
|| !drm_intel_bo_busy(query
->bo
)) {
367 brw_queryobj_get_results(ctx
, query
);
368 query
->Base
.Ready
= true;
373 * Ensure there query's BO has enough space to store a new pair of values.
375 * If not, gather the existing BO's results and create a new buffer of the
379 ensure_bo_has_space(struct gl_context
*ctx
, struct brw_query_object
*query
)
381 struct brw_context
*brw
= brw_context(ctx
);
383 assert(brw
->gen
< 6);
385 if (!query
->bo
|| query
->last_index
* 2 + 1 >= 4096 / sizeof(uint64_t)) {
387 if (query
->bo
!= NULL
) {
388 /* The old query BO did not have enough space, so we allocated a new
389 * one. Gather the results so far (adding up the differences) and
390 * release the old BO.
392 brw_queryobj_get_results(ctx
, query
);
395 query
->bo
= drm_intel_bo_alloc(brw
->bufmgr
, "query", 4096, 1);
396 query
->last_index
= 0;
401 * Record the PS_DEPTH_COUNT value (for occlusion queries) just before
404 * In a pre-hardware context world, the single PS_DEPTH_COUNT register is
405 * shared among all applications using the GPU. However, our query value
406 * needs to only include fragments generated by our application/GL context.
408 * To accommodate this, we record PS_DEPTH_COUNT at the start and end of
409 * each batchbuffer (technically, the first primitive drawn and flush time).
410 * Subtracting each pair of values calculates the change in PS_DEPTH_COUNT
411 * caused by a batchbuffer. Since there is no preemption inside batches,
412 * this is guaranteed to only measure the effects of our current application.
414 * Adding each of these differences (in case drawing is done over many batches)
415 * produces the final expected value.
417 * In a world with hardware contexts, PS_DEPTH_COUNT is saved and restored
418 * as part of the context state, so this is unnecessary, and skipped.
421 brw_emit_query_begin(struct brw_context
*brw
)
423 struct gl_context
*ctx
= &brw
->ctx
;
424 struct brw_query_object
*query
= brw
->query
.obj
;
429 /* Skip if we're not doing any queries, or we've already recorded the
430 * initial query value for this batchbuffer.
432 if (!query
|| brw
->query
.begin_emitted
)
435 ensure_bo_has_space(ctx
, query
);
437 brw_write_depth_count(brw
, query
->bo
, query
->last_index
* 2);
439 brw
->query
.begin_emitted
= true;
443 * Called at batchbuffer flush to get an ending PS_DEPTH_COUNT
444 * (for non-hardware context platforms).
446 * See the explanation in brw_emit_query_begin().
449 brw_emit_query_end(struct brw_context
*brw
)
451 struct brw_query_object
*query
= brw
->query
.obj
;
456 if (!brw
->query
.begin_emitted
)
459 brw_write_depth_count(brw
, query
->bo
, query
->last_index
* 2 + 1);
461 brw
->query
.begin_emitted
= false;
466 * Driver hook for glQueryCounter().
468 * This handles GL_TIMESTAMP queries, which perform a pipelined read of the
469 * current GPU time. This is unlike GL_TIME_ELAPSED, which measures the
470 * time while the query is active.
473 brw_query_counter(struct gl_context
*ctx
, struct gl_query_object
*q
)
475 struct brw_context
*brw
= brw_context(ctx
);
476 struct brw_query_object
*query
= (struct brw_query_object
*) q
;
478 assert(q
->Target
== GL_TIMESTAMP
);
480 drm_intel_bo_unreference(query
->bo
);
481 query
->bo
= drm_intel_bo_alloc(brw
->bufmgr
, "timestamp query", 4096, 4096);
482 brw_write_timestamp(brw
, query
->bo
, 0);
484 query
->flushed
= false;
488 * Read the TIMESTAMP register immediately (in a non-pipelined fashion).
490 * This is used to implement the GetTimestamp() driver hook.
493 brw_get_timestamp(struct gl_context
*ctx
)
495 struct brw_context
*brw
= brw_context(ctx
);
498 switch (brw
->intelScreen
->hw_has_timestamp
) {
499 case 3: /* New kernel, always full 36bit accuracy */
500 drm_intel_reg_read(brw
->bufmgr
, TIMESTAMP
| 1, &result
);
502 case 2: /* 64bit kernel, result is left-shifted by 32bits, losing 4bits */
503 drm_intel_reg_read(brw
->bufmgr
, TIMESTAMP
, &result
);
504 result
= result
>> 32;
506 case 1: /* 32bit kernel, result is 36bit wide but may be inaccurate! */
507 drm_intel_reg_read(brw
->bufmgr
, TIMESTAMP
, &result
);
511 /* See logic in brw_queryobj_get_results() */
513 result
&= (1ull << 36) - 1;
518 * Is this type of query written by PIPE_CONTROL?
521 brw_is_query_pipelined(struct brw_query_object
*query
)
523 switch (query
->Base
.Target
) {
525 case GL_TIME_ELAPSED
:
526 case GL_ANY_SAMPLES_PASSED
:
527 case GL_ANY_SAMPLES_PASSED_CONSERVATIVE
:
528 case GL_SAMPLES_PASSED_ARB
:
531 case GL_PRIMITIVES_GENERATED
:
532 case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN
:
533 case GL_VERTICES_SUBMITTED_ARB
:
534 case GL_PRIMITIVES_SUBMITTED_ARB
:
535 case GL_VERTEX_SHADER_INVOCATIONS_ARB
:
536 case GL_GEOMETRY_SHADER_INVOCATIONS
:
537 case GL_GEOMETRY_SHADER_PRIMITIVES_EMITTED_ARB
:
538 case GL_FRAGMENT_SHADER_INVOCATIONS_ARB
:
539 case GL_CLIPPING_INPUT_PRIMITIVES_ARB
:
540 case GL_CLIPPING_OUTPUT_PRIMITIVES_ARB
:
541 case GL_COMPUTE_SHADER_INVOCATIONS_ARB
:
542 case GL_TESS_CONTROL_SHADER_PATCHES_ARB
:
543 case GL_TESS_EVALUATION_SHADER_INVOCATIONS_ARB
:
547 unreachable("Unrecognized query target in is_query_pipelined()");
551 /* Initialize query object functions used on all generations. */
552 void brw_init_common_queryobj_functions(struct dd_function_table
*functions
)
554 functions
->NewQueryObject
= brw_new_query_object
;
555 functions
->DeleteQuery
= brw_delete_query
;
556 functions
->GetTimestamp
= brw_get_timestamp
;
559 /* Initialize Gen4/5-specific query object functions. */
560 void gen4_init_queryobj_functions(struct dd_function_table
*functions
)
562 functions
->BeginQuery
= brw_begin_query
;
563 functions
->EndQuery
= brw_end_query
;
564 functions
->CheckQuery
= brw_check_query
;
565 functions
->WaitQuery
= brw_wait_query
;
566 functions
->QueryCounter
= brw_query_counter
;