src/mesa/drivers/dri/i965/brw_queryobj.c

   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
  48 /** Waits on the query object's BO and totals the results for this query */
  49 static void
  50 brw_queryobj_get_results(struct brw_query_object *query)
  51 {
  52    int i;
  53    uint64_t *results;
  54
  55    if (query->bo == NULL)
  56       return;
  57
  58    drm_intel_bo_map(query->bo, GL_FALSE);
  59    results = query->bo->virtual;
  60    if (query->Base.Target == GL_TIME_ELAPSED_EXT) {
  61       query->Base.Result += 1000 * ((results[1] >> 32) - (results[0] >> 32));
  62    } else {
  63       /* Map and count the pixels from the current query BO */
  64       for (i = query->first_index; i <= query->last_index; i++) {
  65          query->Base.Result += results[i * 2 + 1] - results[i * 2];
  66       }
  67    }
  68    drm_intel_bo_unmap(query->bo);
  69
  70    drm_intel_bo_unreference(query->bo);
  71    query->bo = NULL;
  72 }
  73
  74 static struct gl_query_object *
  75 brw_new_query_object(GLcontext *ctx, GLuint id)
  76 {
  77    struct brw_query_object *query;
  78
  79    query = calloc(1, sizeof(struct brw_query_object));
  80
  81    query->Base.Id = id;
  82    query->Base.Result = 0;
  83    query->Base.Active = GL_FALSE;
  84    query->Base.Ready = GL_TRUE;
  85
  86    return &query->Base;
  87 }
  88
  89 static void
  90 brw_delete_query(GLcontext *ctx, struct gl_query_object *q)
  91 {
  92    struct brw_query_object *query = (struct brw_query_object *)q;
  93
  94    drm_intel_bo_unreference(query->bo);
  95    free(query);
  96 }
  97
  98 static void
  99 brw_begin_query(GLcontext *ctx, struct gl_query_object *q)
 100 {
 101    struct brw_context *brw = brw_context(ctx);
 102    struct intel_context *intel = intel_context(ctx);
 103    struct brw_query_object *query = (struct brw_query_object *)q;
 104
 105    if (query->Base.Target == GL_TIME_ELAPSED_EXT) {
 106       drm_intel_bo_unreference(query->bo);
 107       query->bo = drm_intel_bo_alloc(intel->bufmgr, "timer query",
 108                                      4096, 4096);
 109
 110       BEGIN_BATCH(4);
 111       OUT_BATCH(_3DSTATE_PIPE_CONTROL |
 112                 PIPE_CONTROL_WRITE_TIMESTAMP);
 113       OUT_RELOC(query->bo,
 114                 I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
 115                 PIPE_CONTROL_GLOBAL_GTT_WRITE |
 116                 0);
 117       OUT_BATCH(0);
 118       OUT_BATCH(0);
 119       ADVANCE_BATCH();
 120    } else {
 121       /* Reset our driver's tracking of query state. */
 122       drm_intel_bo_unreference(query->bo);
 123       query->bo = NULL;
 124       query->first_index = -1;
 125       query->last_index = -1;
 126
 127       brw->query.obj = query;
 128       intel->stats_wm++;
 129    }
 130 }
 131
 132 /**
 133  * Begin the ARB_occlusion_query query on a query object.
 134  */
 135 static void
 136 brw_end_query(GLcontext *ctx, struct gl_query_object *q)
 137 {
 138    struct brw_context *brw = brw_context(ctx);
 139    struct intel_context *intel = intel_context(ctx);
 140    struct brw_query_object *query = (struct brw_query_object *)q;
 141
 142    if (query->Base.Target == GL_TIME_ELAPSED_EXT) {
 143       BEGIN_BATCH(4);
 144       OUT_BATCH(_3DSTATE_PIPE_CONTROL |
 145                 PIPE_CONTROL_WRITE_TIMESTAMP);
 146       OUT_RELOC(query->bo,
 147                 I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
 148                 PIPE_CONTROL_GLOBAL_GTT_WRITE |
 149                 8);
 150       OUT_BATCH(0);
 151       OUT_BATCH(0);
 152       ADVANCE_BATCH();
 153
 154       intel_batchbuffer_flush(intel->batch);
 155    } else {
 156       /* Flush the batchbuffer in case it has writes to our query BO.
 157        * Have later queries write to a new query BO so that further rendering
 158        * doesn't delay the collection of our results.
 159        */
 160       if (query->bo) {
 161          brw_emit_query_end(brw);
 162          intel_batchbuffer_flush(intel->batch);
 163
 164          drm_intel_bo_unreference(brw->query.bo);
 165          brw->query.bo = NULL;
 166       }
 167
 168       brw->query.obj = NULL;
 169
 170       intel->stats_wm--;
 171    }
 172 }
 173
 174 static void brw_wait_query(GLcontext *ctx, struct gl_query_object *q)
 175 {
 176    struct brw_query_object *query = (struct brw_query_object *)q;
 177
 178    brw_queryobj_get_results(query);
 179    query->Base.Ready = GL_TRUE;
 180 }
 181
 182 static void brw_check_query(GLcontext *ctx, struct gl_query_object *q)
 183 {
 184    struct brw_query_object *query = (struct brw_query_object *)q;
 185
 186    if (query->bo == NULL || !drm_intel_bo_busy(query->bo)) {
 187       brw_queryobj_get_results(query);
 188       query->Base.Ready = GL_TRUE;
 189    }
 190 }
 191
 192 /** Called to set up the query BO and account for its aperture space */
 193 void
 194 brw_prepare_query_begin(struct brw_context *brw)
 195 {
 196    struct intel_context *intel = &brw->intel;
 197
 198    /* Skip if we're not doing any queries. */
 199    if (!brw->query.obj)
 200       return;
 201
 202    /* Get a new query BO if we're going to need it. */
 203    if (brw->query.bo == NULL ||
 204        brw->query.index * 2 + 1 >= 4096 / sizeof(uint64_t)) {
 205       drm_intel_bo_unreference(brw->query.bo);
 206       brw->query.bo = NULL;
 207
 208       brw->query.bo = drm_intel_bo_alloc(intel->bufmgr, "query", 4096, 1);
 209       brw->query.index = 0;
 210    }
 211
 212    brw_add_validated_bo(brw, brw->query.bo);
 213 }
 214
 215 /** Called just before primitive drawing to get a beginning PS_DEPTH_COUNT. */
 216 void
 217 brw_emit_query_begin(struct brw_context *brw)
 218 {
 219    struct intel_context *intel = &brw->intel;
 220    struct brw_query_object *query = brw->query.obj;
 221
 222    /* Skip if we're not doing any queries, or we've emitted the start. */
 223    if (!query || brw->query.active)
 224       return;
 225
 226    BEGIN_BATCH(4);
 227    OUT_BATCH(_3DSTATE_PIPE_CONTROL |
 228              PIPE_CONTROL_DEPTH_STALL |
 229              PIPE_CONTROL_WRITE_DEPTH_COUNT);
 230    /* This object could be mapped cacheable, but we don't have an exposed
 231     * mechanism to support that.  Since it's going uncached, tell GEM that
 232     * we're writing to it.  The usual clflush should be all that's required
 233     * to pick up the results.
 234     */
 235    OUT_RELOC(brw->query.bo,
 236              I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
 237              PIPE_CONTROL_GLOBAL_GTT_WRITE |
 238              ((brw->query.index * 2) * sizeof(uint64_t)));
 239    OUT_BATCH(0);
 240    OUT_BATCH(0);
 241    ADVANCE_BATCH();
 242
 243    if (query->bo != brw->query.bo) {
 244       if (query->bo != NULL)
 245          brw_queryobj_get_results(query);
 246       drm_intel_bo_reference(brw->query.bo);
 247       query->bo = brw->query.bo;
 248       query->first_index = brw->query.index;
 249    }
 250    query->last_index = brw->query.index;
 251    brw->query.active = GL_TRUE;
 252 }
 253
 254 /** Called at batchbuffer flush to get an ending PS_DEPTH_COUNT */
 255 void
 256 brw_emit_query_end(struct brw_context *brw)
 257 {
 258    struct intel_context *intel = &brw->intel;
 259
 260    if (!brw->query.active)
 261       return;
 262
 263    BEGIN_BATCH(4);
 264    OUT_BATCH(_3DSTATE_PIPE_CONTROL |
 265              PIPE_CONTROL_DEPTH_STALL |
 266              PIPE_CONTROL_WRITE_DEPTH_COUNT);
 267    OUT_RELOC(brw->query.bo,
 268              I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
 269              PIPE_CONTROL_GLOBAL_GTT_WRITE |
 270              ((brw->query.index * 2 + 1) * sizeof(uint64_t)));
 271    OUT_BATCH(0);
 272    OUT_BATCH(0);
 273    ADVANCE_BATCH();
 274
 275    brw->query.active = GL_FALSE;
 276    brw->query.index++;
 277 }
 278
 279 void brw_init_queryobj_functions(struct dd_function_table *functions)
 280 {
 281    functions->NewQueryObject = brw_new_query_object;
 282    functions->DeleteQuery = brw_delete_query;
 283    functions->BeginQuery = brw_begin_query;
 284    functions->EndQuery = brw_end_query;
 285    functions->CheckQuery = brw_check_query;
 286    functions->WaitQuery = brw_wait_query;
 287 }