brw_queryobj.c revision e45a9ce474c3562f16c8a773260752d77a4fed5c 
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      BEGIN_BATCH(9);
95
96      /* workaround: CS stall required before depth stall. */
97      OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2));
98      OUT_BATCH(PIPE_CONTROL_CS_STALL);
99      OUT_BATCH(0); /* write address */
100      OUT_BATCH(0); /* write data */
101
102      OUT_BATCH(_3DSTATE_PIPE_CONTROL | (5 - 2));
103      OUT_BATCH(PIPE_CONTROL_DEPTH_STALL |
104                PIPE_CONTROL_WRITE_DEPTH_COUNT);
105      OUT_RELOC(query_bo,
106                I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
107                PIPE_CONTROL_GLOBAL_GTT_WRITE |
108                (idx * sizeof(uint64_t)));
109      OUT_BATCH(0);
110      OUT_BATCH(0);
111      ADVANCE_BATCH();
112   } else {
113      BEGIN_BATCH(4);
114      OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2) |
115                PIPE_CONTROL_DEPTH_STALL |
116                PIPE_CONTROL_WRITE_DEPTH_COUNT);
117      /* This object could be mapped cacheable, but we don't have an exposed
118       * mechanism to support that.  Since it's going uncached, tell GEM that
119       * we're writing to it.  The usual clflush should be all that's required
120       * to pick up the results.
121       */
122      OUT_RELOC(query_bo,
123                I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
124                PIPE_CONTROL_GLOBAL_GTT_WRITE |
125                (idx * sizeof(uint64_t)));
126      OUT_BATCH(0);
127      OUT_BATCH(0);
128      ADVANCE_BATCH();
129   }
130}
131
132/** Waits on the query object's BO and totals the results for this query */
133static void
134brw_queryobj_get_results(struct gl_context *ctx,
135			 struct brw_query_object *query)
136{
137   struct intel_context *intel = intel_context(ctx);
138
139   int i;
140   uint64_t *results;
141
142   if (query->bo == NULL)
143      return;
144
145   drm_intel_bo_map(query->bo, false);
146   results = query->bo->virtual;
147   switch (query->Base.Target) {
148   case GL_TIME_ELAPSED_EXT:
149      if (intel->gen >= 6)
150	 query->Base.Result += 80 * (results[1] - results[0]);
151      else
152	 query->Base.Result += 1000 * ((results[1] >> 32) - (results[0] >> 32));
153      break;
154
155   case GL_SAMPLES_PASSED_ARB:
156      /* Map and count the pixels from the current query BO */
157      for (i = query->first_index; i <= query->last_index; i++) {
158	 query->Base.Result += results[i * 2 + 1] - results[i * 2];
159      }
160      break;
161
162   case GL_PRIMITIVES_GENERATED:
163   case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
164      /* We don't actually query the hardware for this value, so query->bo
165       * should always be NULL and execution should never reach here.
166       */
167      assert(!"Unreachable");
168      break;
169
170   default:
171      assert(!"Unrecognized query target in brw_queryobj_get_results()");
172      break;
173   }
174   drm_intel_bo_unmap(query->bo);
175
176   drm_intel_bo_unreference(query->bo);
177   query->bo = NULL;
178}
179
180static struct gl_query_object *
181brw_new_query_object(struct gl_context *ctx, GLuint id)
182{
183   struct brw_query_object *query;
184
185   query = calloc(1, sizeof(struct brw_query_object));
186
187   query->Base.Id = id;
188   query->Base.Result = 0;
189   query->Base.Active = false;
190   query->Base.Ready = true;
191
192   return &query->Base;
193}
194
195static void
196brw_delete_query(struct gl_context *ctx, struct gl_query_object *q)
197{
198   struct brw_query_object *query = (struct brw_query_object *)q;
199
200   drm_intel_bo_unreference(query->bo);
201   free(query);
202}
203
204static void
205brw_begin_query(struct gl_context *ctx, struct gl_query_object *q)
206{
207   struct brw_context *brw = brw_context(ctx);
208   struct intel_context *intel = intel_context(ctx);
209   struct brw_query_object *query = (struct brw_query_object *)q;
210
211   switch (query->Base.Target) {
212   case GL_TIME_ELAPSED_EXT:
213      drm_intel_bo_unreference(query->bo);
214      query->bo = drm_intel_bo_alloc(intel->bufmgr, "timer query", 4096, 4096);
215      write_timestamp(intel, query->bo, 0);
216      break;
217
218   case GL_SAMPLES_PASSED_ARB:
219      /* Reset our driver's tracking of query state. */
220      drm_intel_bo_unreference(query->bo);
221      query->bo = NULL;
222      query->first_index = -1;
223      query->last_index = -1;
224
225      brw->query.obj = query;
226      intel->stats_wm++;
227      break;
228
229   case GL_PRIMITIVES_GENERATED:
230      /* We don't actually query the hardware for this value; we keep track of
231       * it a software counter.  So just reset the counter.
232       */
233      brw->sol.primitives_generated = 0;
234      brw->sol.counting_primitives_generated = true;
235      break;
236
237   case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
238      /* We don't actually query the hardware for this value; we keep track of
239       * it a software counter.  So just reset the counter.
240       */
241      brw->sol.primitives_written = 0;
242      brw->sol.counting_primitives_written = true;
243      break;
244
245   default:
246      assert(!"Unrecognized query target in brw_begin_query()");
247      break;
248   }
249}
250
251/**
252 * Begin the ARB_occlusion_query query on a query object.
253 */
254static void
255brw_end_query(struct gl_context *ctx, struct gl_query_object *q)
256{
257   struct brw_context *brw = brw_context(ctx);
258   struct intel_context *intel = intel_context(ctx);
259   struct brw_query_object *query = (struct brw_query_object *)q;
260
261   switch (query->Base.Target) {
262   case GL_TIME_ELAPSED_EXT:
263      write_timestamp(intel, query->bo, 1);
264      intel_batchbuffer_flush(intel);
265      break;
266
267   case GL_SAMPLES_PASSED_ARB:
268      /* Flush the batchbuffer in case it has writes to our query BO.
269       * Have later queries write to a new query BO so that further rendering
270       * doesn't delay the collection of our results.
271       */
272      if (query->bo) {
273	 brw_emit_query_end(brw);
274	 intel_batchbuffer_flush(intel);
275
276	 drm_intel_bo_unreference(brw->query.bo);
277	 brw->query.bo = NULL;
278      }
279
280      brw->query.obj = NULL;
281
282      intel->stats_wm--;
283      break;
284
285   case GL_PRIMITIVES_GENERATED:
286      /* We don't actually query the hardware for this value; we keep track of
287       * it in a software counter.  So just read the counter and store it in
288       * the query object.
289       */
290      query->Base.Result = brw->sol.primitives_generated;
291      brw->sol.counting_primitives_generated = false;
292
293      /* And set brw->query.obj to NULL so that this query won't try to wait
294       * for any rendering to complete.
295       */
296      query->bo = NULL;
297      break;
298
299   case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
300      /* We don't actually query the hardware for this value; we keep track of
301       * it in a software counter.  So just read the counter and store it in
302       * the query object.
303       */
304      query->Base.Result = brw->sol.primitives_written;
305      brw->sol.counting_primitives_written = false;
306
307      /* And set brw->query.obj to NULL so that this query won't try to wait
308       * for any rendering to complete.
309       */
310      query->bo = NULL;
311      break;
312
313   default:
314      assert(!"Unrecognized query target in brw_end_query()");
315      break;
316   }
317}
318
319static void brw_wait_query(struct gl_context *ctx, struct gl_query_object *q)
320{
321   struct brw_query_object *query = (struct brw_query_object *)q;
322
323   brw_queryobj_get_results(ctx, query);
324   query->Base.Ready = true;
325}
326
327static void brw_check_query(struct gl_context *ctx, struct gl_query_object *q)
328{
329   struct brw_query_object *query = (struct brw_query_object *)q;
330
331   if (query->bo == NULL || !drm_intel_bo_busy(query->bo)) {
332      brw_queryobj_get_results(ctx, query);
333      query->Base.Ready = true;
334   }
335}
336
337/** Called to set up the query BO and account for its aperture space */
338void
339brw_prepare_query_begin(struct brw_context *brw)
340{
341   struct intel_context *intel = &brw->intel;
342
343   /* Skip if we're not doing any queries. */
344   if (!brw->query.obj)
345      return;
346
347   /* Get a new query BO if we're going to need it. */
348   if (brw->query.bo == NULL ||
349       brw->query.index * 2 + 1 >= 4096 / sizeof(uint64_t)) {
350      drm_intel_bo_unreference(brw->query.bo);
351      brw->query.bo = NULL;
352
353      brw->query.bo = drm_intel_bo_alloc(intel->bufmgr, "query", 4096, 1);
354
355      /* clear target buffer */
356      drm_intel_bo_map(brw->query.bo, true);
357      memset((char *)brw->query.bo->virtual, 0, 4096);
358      drm_intel_bo_unmap(brw->query.bo);
359
360      brw->query.index = 0;
361   }
362}
363
364/** Called just before primitive drawing to get a beginning PS_DEPTH_COUNT. */
365void
366brw_emit_query_begin(struct brw_context *brw)
367{
368   struct intel_context *intel = &brw->intel;
369   struct gl_context *ctx = &intel->ctx;
370   struct brw_query_object *query = brw->query.obj;
371
372   /* Skip if we're not doing any queries, or we've emitted the start. */
373   if (!query || brw->query.active)
374      return;
375
376   write_depth_count(intel, brw->query.bo, brw->query.index * 2);
377
378   if (query->bo != brw->query.bo) {
379      if (query->bo != NULL)
380	 brw_queryobj_get_results(ctx, query);
381      drm_intel_bo_reference(brw->query.bo);
382      query->bo = brw->query.bo;
383      query->first_index = brw->query.index;
384   }
385   query->last_index = brw->query.index;
386   brw->query.active = true;
387}
388
389/** Called at batchbuffer flush to get an ending PS_DEPTH_COUNT */
390void
391brw_emit_query_end(struct brw_context *brw)
392{
393   struct intel_context *intel = &brw->intel;
394
395   if (!brw->query.active)
396      return;
397
398   write_depth_count(intel, brw->query.bo, brw->query.index * 2 + 1);
399
400   brw->query.active = false;
401   brw->query.index++;
402}
403
404void brw_init_queryobj_functions(struct dd_function_table *functions)
405{
406   functions->NewQueryObject = brw_new_query_object;
407   functions->DeleteQuery = brw_delete_query;
408   functions->BeginQuery = brw_begin_query;
409   functions->EndQuery = brw_end_query;
410   functions->CheckQuery = brw_check_query;
411   functions->WaitQuery = brw_wait_query;
412}
413