brw_queryobj.c revision 5deb1d1a1f9e3354597569032af9bdf27d629cca 
1/*
2 * Copyright © 2008 Intel Corporation
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
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 *    Eric Anholt <eric@anholt.net>
25 *
26 */
27
28/** @file support for ARB_query_object
29 *
30 * ARB_query_object is implemented by using the PIPE_CONTROL command to stall
31 * execution on the completion of previous depth tests, and write the
32 * current PS_DEPTH_COUNT to a buffer object.
33 *
34 * We use before and after counts when drawing during a query so that
35 * we don't pick up other clients' query data in ours.  To reduce overhead,
36 * a single BO is used to record the query data for all active queries at
37 * once.  This also gives us a simple bound on how much batchbuffer space is
38 * required for handling queries, so that we can be sure that we won't
39 * have to emit a batchbuffer without getting the ending PS_DEPTH_COUNT.
40 */
41#include "main/imports.h"
42
43#include "brw_context.h"
44#include "brw_state.h"
45#include "intel_batchbuffer.h"
46#include "intel_reg.h"
47
48static void
49write_timestamp(struct intel_context *intel, drm_intel_bo *query_bo, int idx)
50{
51   if (intel->gen >= 6) {
52      /* Emit workaround flushes: */
53      if (intel->gen == 6) {
54         /* The timestamp write below is a non-zero post-sync op, which on
55          * Gen6 necessitates a CS stall.  CS stalls need stall at scoreboard
56          * set.  See the comments for intel_emit_post_sync_nonzero_flush().
57          */
58         BEGIN_BATCH(4);
59         OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2));
60         OUT_BATCH(PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD);
61         OUT_BATCH(0);
62         OUT_BATCH(0);
63         ADVANCE_BATCH();
64      }
65
66      BEGIN_BATCH(5);
67      OUT_BATCH(_3DSTATE_PIPE_CONTROL | (5 - 2));
68      OUT_BATCH(PIPE_CONTROL_WRITE_TIMESTAMP);
69      OUT_RELOC(query_bo,
70                I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
71                PIPE_CONTROL_GLOBAL_GTT_WRITE |
72                idx * sizeof(uint64_t));
73      OUT_BATCH(0);
74      OUT_BATCH(0);
75      ADVANCE_BATCH();
76   } else {
77      BEGIN_BATCH(4);
78      OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2) |
79                PIPE_CONTROL_WRITE_TIMESTAMP);
80      OUT_RELOC(query_bo,
81                I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
82                PIPE_CONTROL_GLOBAL_GTT_WRITE |
83                idx * sizeof(uint64_t));
84      OUT_BATCH(0);
85      OUT_BATCH(0);
86      ADVANCE_BATCH();
87   }
88}
89
90static void
91write_depth_count(struct intel_context *intel, drm_intel_bo *query_bo, int idx)
92{
93   if (intel->gen >= 6) {
94      /* Emit Sandybridge workaround flush: */
95      if (intel->gen == 6)
96         intel_emit_post_sync_nonzero_flush(intel);
97
98      BEGIN_BATCH(5);
99      OUT_BATCH(_3DSTATE_PIPE_CONTROL | (5 - 2));
100      OUT_BATCH(PIPE_CONTROL_DEPTH_STALL |
101                PIPE_CONTROL_WRITE_DEPTH_COUNT);
102      OUT_RELOC(query_bo,
103                I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
104                PIPE_CONTROL_GLOBAL_GTT_WRITE |
105                (idx * sizeof(uint64_t)));
106      OUT_BATCH(0);
107      OUT_BATCH(0);
108      ADVANCE_BATCH();
109   } else {
110      BEGIN_BATCH(4);
111      OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2) |
112                PIPE_CONTROL_DEPTH_STALL |
113                PIPE_CONTROL_WRITE_DEPTH_COUNT);
114      /* This object could be mapped cacheable, but we don't have an exposed
115       * mechanism to support that.  Since it's going uncached, tell GEM that
116       * we're writing to it.  The usual clflush should be all that's required
117       * to pick up the results.
118       */
119      OUT_RELOC(query_bo,
120                I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
121                PIPE_CONTROL_GLOBAL_GTT_WRITE |
122                (idx * sizeof(uint64_t)));
123      OUT_BATCH(0);
124      OUT_BATCH(0);
125      ADVANCE_BATCH();
126   }
127}
128
129/** Waits on the query object's BO and totals the results for this query */
130static void
131brw_queryobj_get_results(struct gl_context *ctx,
132			 struct brw_query_object *query)
133{
134   struct intel_context *intel = intel_context(ctx);
135
136   int i;
137   uint64_t *results;
138
139   if (query->bo == NULL)
140      return;
141
142   drm_intel_bo_map(query->bo, false);
143   results = query->bo->virtual;
144   switch (query->Base.Target) {
145   case GL_TIME_ELAPSED_EXT:
146      if (intel->gen >= 6)
147	 query->Base.Result += 80 * (results[1] - results[0]);
148      else
149	 query->Base.Result += 1000 * ((results[1] >> 32) - (results[0] >> 32));
150      break;
151
152   case GL_SAMPLES_PASSED_ARB:
153      /* Map and count the pixels from the current query BO */
154      for (i = query->first_index; i <= query->last_index; i++) {
155	 query->Base.Result += results[i * 2 + 1] - results[i * 2];
156      }
157      break;
158
159   case GL_PRIMITIVES_GENERATED:
160   case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
161      /* We don't actually query the hardware for this value, so query->bo
162       * should always be NULL and execution should never reach here.
163       */
164      assert(!"Unreachable");
165      break;
166
167   default:
168      assert(!"Unrecognized query target in brw_queryobj_get_results()");
169      break;
170   }
171   drm_intel_bo_unmap(query->bo);
172
173   drm_intel_bo_unreference(query->bo);
174   query->bo = NULL;
175}
176
177static struct gl_query_object *
178brw_new_query_object(struct gl_context *ctx, GLuint id)
179{
180   struct brw_query_object *query;
181
182   query = calloc(1, sizeof(struct brw_query_object));
183
184   query->Base.Id = id;
185   query->Base.Result = 0;
186   query->Base.Active = false;
187   query->Base.Ready = true;
188
189   return &query->Base;
190}
191
192static void
193brw_delete_query(struct gl_context *ctx, struct gl_query_object *q)
194{
195   struct brw_query_object *query = (struct brw_query_object *)q;
196
197   drm_intel_bo_unreference(query->bo);
198   free(query);
199}
200
201static void
202brw_begin_query(struct gl_context *ctx, struct gl_query_object *q)
203{
204   struct brw_context *brw = brw_context(ctx);
205   struct intel_context *intel = intel_context(ctx);
206   struct brw_query_object *query = (struct brw_query_object *)q;
207
208   switch (query->Base.Target) {
209   case GL_TIME_ELAPSED_EXT:
210      drm_intel_bo_unreference(query->bo);
211      query->bo = drm_intel_bo_alloc(intel->bufmgr, "timer query", 4096, 4096);
212      write_timestamp(intel, query->bo, 0);
213      break;
214
215   case GL_SAMPLES_PASSED_ARB:
216      /* Reset our driver's tracking of query state. */
217      drm_intel_bo_unreference(query->bo);
218      query->bo = NULL;
219      query->first_index = -1;
220      query->last_index = -1;
221
222      brw->query.obj = query;
223      intel->stats_wm++;
224      break;
225
226   case GL_PRIMITIVES_GENERATED:
227      /* We don't actually query the hardware for this value; we keep track of
228       * it a software counter.  So just reset the counter.
229       */
230      brw->sol.primitives_generated = 0;
231      brw->sol.counting_primitives_generated = true;
232      break;
233
234   case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
235      /* We don't actually query the hardware for this value; we keep track of
236       * it a software counter.  So just reset the counter.
237       */
238      brw->sol.primitives_written = 0;
239      brw->sol.counting_primitives_written = true;
240      break;
241
242   default:
243      assert(!"Unrecognized query target in brw_begin_query()");
244      break;
245   }
246}
247
248/**
249 * Begin the ARB_occlusion_query query on a query object.
250 */
251static void
252brw_end_query(struct gl_context *ctx, struct gl_query_object *q)
253{
254   struct brw_context *brw = brw_context(ctx);
255   struct intel_context *intel = intel_context(ctx);
256   struct brw_query_object *query = (struct brw_query_object *)q;
257
258   switch (query->Base.Target) {
259   case GL_TIME_ELAPSED_EXT:
260      write_timestamp(intel, query->bo, 1);
261      intel_batchbuffer_flush(intel);
262      break;
263
264   case GL_SAMPLES_PASSED_ARB:
265      /* Flush the batchbuffer in case it has writes to our query BO.
266       * Have later queries write to a new query BO so that further rendering
267       * doesn't delay the collection of our results.
268       */
269      if (query->bo) {
270	 brw_emit_query_end(brw);
271	 intel_batchbuffer_flush(intel);
272
273	 drm_intel_bo_unreference(brw->query.bo);
274	 brw->query.bo = NULL;
275      }
276
277      brw->query.obj = NULL;
278
279      intel->stats_wm--;
280      break;
281
282   case GL_PRIMITIVES_GENERATED:
283      /* We don't actually query the hardware for this value; we keep track of
284       * it in a software counter.  So just read the counter and store it in
285       * the query object.
286       */
287      query->Base.Result = brw->sol.primitives_generated;
288      brw->sol.counting_primitives_generated = false;
289
290      /* And set brw->query.obj to NULL so that this query won't try to wait
291       * for any rendering to complete.
292       */
293      query->bo = NULL;
294      break;
295
296   case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
297      /* We don't actually query the hardware for this value; we keep track of
298       * it in a software counter.  So just read the counter and store it in
299       * the query object.
300       */
301      query->Base.Result = brw->sol.primitives_written;
302      brw->sol.counting_primitives_written = false;
303
304      /* And set brw->query.obj to NULL so that this query won't try to wait
305       * for any rendering to complete.
306       */
307      query->bo = NULL;
308      break;
309
310   default:
311      assert(!"Unrecognized query target in brw_end_query()");
312      break;
313   }
314}
315
316static void brw_wait_query(struct gl_context *ctx, struct gl_query_object *q)
317{
318   struct brw_query_object *query = (struct brw_query_object *)q;
319
320   brw_queryobj_get_results(ctx, query);
321   query->Base.Ready = true;
322}
323
324static void brw_check_query(struct gl_context *ctx, struct gl_query_object *q)
325{
326   struct brw_query_object *query = (struct brw_query_object *)q;
327
328   if (query->bo == NULL || !drm_intel_bo_busy(query->bo)) {
329      brw_queryobj_get_results(ctx, query);
330      query->Base.Ready = true;
331   }
332}
333
334/** Called to set up the query BO and account for its aperture space */
335void
336brw_prepare_query_begin(struct brw_context *brw)
337{
338   struct intel_context *intel = &brw->intel;
339
340   /* Skip if we're not doing any queries. */
341   if (!brw->query.obj)
342      return;
343
344   /* Get a new query BO if we're going to need it. */
345   if (brw->query.bo == NULL ||
346       brw->query.index * 2 + 1 >= 4096 / sizeof(uint64_t)) {
347      drm_intel_bo_unreference(brw->query.bo);
348      brw->query.bo = NULL;
349
350      brw->query.bo = drm_intel_bo_alloc(intel->bufmgr, "query", 4096, 1);
351
352      /* clear target buffer */
353      drm_intel_bo_map(brw->query.bo, true);
354      memset((char *)brw->query.bo->virtual, 0, 4096);
355      drm_intel_bo_unmap(brw->query.bo);
356
357      brw->query.index = 0;
358   }
359}
360
361/** Called just before primitive drawing to get a beginning PS_DEPTH_COUNT. */
362void
363brw_emit_query_begin(struct brw_context *brw)
364{
365   struct intel_context *intel = &brw->intel;
366   struct gl_context *ctx = &intel->ctx;
367   struct brw_query_object *query = brw->query.obj;
368
369   /* Skip if we're not doing any queries, or we've emitted the start. */
370   if (!query || brw->query.active)
371      return;
372
373   write_depth_count(intel, brw->query.bo, brw->query.index * 2);
374
375   if (query->bo != brw->query.bo) {
376      if (query->bo != NULL)
377	 brw_queryobj_get_results(ctx, query);
378      drm_intel_bo_reference(brw->query.bo);
379      query->bo = brw->query.bo;
380      query->first_index = brw->query.index;
381   }
382   query->last_index = brw->query.index;
383   brw->query.active = true;
384}
385
386/** Called at batchbuffer flush to get an ending PS_DEPTH_COUNT */
387void
388brw_emit_query_end(struct brw_context *brw)
389{
390   struct intel_context *intel = &brw->intel;
391
392   if (!brw->query.active)
393      return;
394
395   write_depth_count(intel, brw->query.bo, brw->query.index * 2 + 1);
396
397   brw->query.active = false;
398   brw->query.index++;
399}
400
401void brw_init_queryobj_functions(struct dd_function_table *functions)
402{
403   functions->NewQueryObject = brw_new_query_object;
404   functions->DeleteQuery = brw_delete_query;
405   functions->BeginQuery = brw_begin_query;
406   functions->EndQuery = brw_end_query;
407   functions->CheckQuery = brw_check_query;
408   functions->WaitQuery = brw_wait_query;
409}
410