src/gallium/drivers/i965/brw_pipe_query.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 "util/u_simple_list.h"
  42
  43 #include "brw_context.h"
  44 #include "brw_state.h"
  45 #include "brw_batchbuffer.h"
  46 #include "brw_reg.h"
  47
  48 /** Waits on the query object's BO and totals the results for this query */
  49 static boolean
  50 brw_query_get_result(struct pipe_context *pipe,
  51                      struct pipe_query *q,
  52                      boolean wait,
  53                      uint64_t *result)
  54 {
  55    struct brw_context *brw = brw_context(pipe);
  56    struct brw_query_object *query = (struct brw_query_object *)q;
  57
  58    /* Map and count the pixels from the current query BO */
  59    if (query->bo) {
  60       int i;
  61       uint64_t *map;
  62
  63       if (brw->sws->bo_is_busy(query->bo) && !wait)
  64          return FALSE;
  65
  66       map = bo_map_read(brw->sws, query->bo);
  67       if (map == NULL)
  68          return FALSE;
  69
  70       for (i = query->first_index; i <= query->last_index; i++) {
  71          query->result += map[i * 2 + 1] - map[i * 2];
  72       }
  73
  74       brw->sws->bo_unmap(query->bo);
  75       bo_reference(&query->bo, NULL);
  76    }
  77
  78    *result = query->result;
  79    return TRUE;
  80 }
  81
  82 static struct pipe_query *
  83 brw_query_create(struct pipe_context *pipe, unsigned type )
  84 {
  85    struct brw_query_object *query;
  86
  87    switch (type) {
  88    case PIPE_QUERY_OCCLUSION_COUNTER:
  89       query = CALLOC_STRUCT( brw_query_object );
  90       if (query == NULL)
  91          return NULL;
  92       return (struct pipe_query *)query;
  93
  94    default:
  95       return NULL;
  96    }
  97 }
  98
  99 static void
 100 brw_query_destroy(struct pipe_context *pipe, struct pipe_query *q)
 101 {
 102    struct brw_query_object *query = (struct brw_query_object *)q;
 103
 104    bo_reference(&query->bo, NULL);
 105    FREE(query);
 106 }
 107
 108 static void
 109 brw_query_begin(struct pipe_context *pipe, struct pipe_query *q)
 110 {
 111    struct brw_context *brw = brw_context(pipe);
 112    struct brw_query_object *query = (struct brw_query_object *)q;
 113
 114    /* Reset our driver's tracking of query state. */
 115    bo_reference(&query->bo, NULL);
 116    query->result = 0;
 117    query->first_index = -1;
 118    query->last_index = -1;
 119
 120    insert_at_head(&brw->query.active_head, query);
 121    brw->query.stats_wm++;
 122    brw->state.dirty.mesa |= PIPE_NEW_QUERY;
 123 }
 124
 125 static void
 126 brw_query_end(struct pipe_context *pipe, struct pipe_query *q)
 127 {
 128    struct brw_context *brw = brw_context(pipe);
 129    struct brw_query_object *query = (struct brw_query_object *)q;
 130
 131    /* Flush the batchbuffer in case it has writes to our query BO.
 132     * Have later queries write to a new query BO so that further rendering
 133     * doesn't delay the collection of our results.
 134     */
 135    if (query->bo) {
 136       brw_emit_query_end(brw);
 137       brw_context_flush( brw );
 138
 139       bo_reference(&brw->query.bo, NULL);
 140    }
 141
 142    remove_from_list(query);
 143    brw->query.stats_wm--;
 144    brw->state.dirty.mesa |= PIPE_NEW_QUERY;
 145 }
 146
 147 /***********************************************************************
 148  * Internal functions and callbacks to implement queries
 149  */
 150
 151 /** Called to set up the query BO and account for its aperture space */
 152 enum pipe_error
 153 brw_prepare_query_begin(struct brw_context *brw)
 154 {
 155    enum pipe_error ret;
 156
 157    /* Skip if we're not doing any queries. */
 158    if (is_empty_list(&brw->query.active_head))
 159       return PIPE_OK;
 160
 161    /* Get a new query BO if we're going to need it. */
 162    if (brw->query.bo == NULL ||
 163        brw->query.index * 2 + 1 >= 4096 / sizeof(uint64_t)) {
 164
 165       ret = brw->sws->bo_alloc(brw->sws, BRW_BUFFER_TYPE_QUERY, 4096, 1,
 166                                &brw->query.bo);
 167       if (ret)
 168          return ret;
 169
 170       brw->query.index = 0;
 171    }
 172
 173    brw_add_validated_bo(brw, brw->query.bo);
 174
 175    return PIPE_OK;
 176 }
 177
 178 /** Called just before primitive drawing to get a beginning PS_DEPTH_COUNT. */
 179 void
 180 brw_emit_query_begin(struct brw_context *brw)
 181 {
 182    struct brw_query_object *query;
 183
 184    /* Skip if we're not doing any queries, or we've emitted the start. */
 185    if (brw->query.active || is_empty_list(&brw->query.active_head))
 186       return;
 187
 188    BEGIN_BATCH(4, IGNORE_CLIPRECTS);
 189    OUT_BATCH(_3DSTATE_PIPE_CONTROL |
 190              PIPE_CONTROL_DEPTH_STALL |
 191              PIPE_CONTROL_WRITE_DEPTH_COUNT);
 192    /* This object could be mapped cacheable, but we don't have an exposed
 193     * mechanism to support that.  Since it's going uncached, tell GEM that
 194     * we're writing to it.  The usual clflush should be all that's required
 195     * to pick up the results.
 196     */
 197    OUT_RELOC(brw->query.bo,
 198              BRW_USAGE_QUERY_RESULT,
 199              PIPE_CONTROL_GLOBAL_GTT_WRITE |
 200              ((brw->query.index * 2) * sizeof(uint64_t)));
 201    OUT_BATCH(0);
 202    OUT_BATCH(0);
 203    ADVANCE_BATCH();
 204
 205    foreach(query, &brw->query.active_head) {
 206       if (query->bo != brw->query.bo) {
 207          uint64_t tmp;
 208
 209          /* Propogate the results from this buffer to all of the
 210           * active queries, as the bo is going away.
 211           */
 212          if (query->bo != NULL)
 213             brw_query_get_result( &brw->base,
 214                                   (struct pipe_query *)query,
 215                                   FALSE,
 216                                   &tmp );
 217
 218          bo_reference( &query->bo, brw->query.bo );
 219          query->first_index = brw->query.index;
 220       }
 221       query->last_index = brw->query.index;
 222    }
 223    brw->query.active = GL_TRUE;
 224 }
 225
 226 /** Called at batchbuffer flush to get an ending PS_DEPTH_COUNT */
 227 void
 228 brw_emit_query_end(struct brw_context *brw)
 229 {
 230    if (!brw->query.active)
 231       return;
 232
 233    BEGIN_BATCH(4, IGNORE_CLIPRECTS);
 234    OUT_BATCH(_3DSTATE_PIPE_CONTROL |
 235              PIPE_CONTROL_DEPTH_STALL |
 236              PIPE_CONTROL_WRITE_DEPTH_COUNT);
 237    OUT_RELOC(brw->query.bo,
 238              BRW_USAGE_QUERY_RESULT,
 239              PIPE_CONTROL_GLOBAL_GTT_WRITE |
 240              ((brw->query.index * 2 + 1) * sizeof(uint64_t)));
 241    OUT_BATCH(0);
 242    OUT_BATCH(0);
 243    ADVANCE_BATCH();
 244
 245    brw->query.active = GL_FALSE;
 246    brw->query.index++;
 247 }
 248
 249 void brw_pipe_query_init( struct brw_context *brw )
 250 {
 251    brw->base.create_query = brw_query_create;
 252    brw->base.destroy_query = brw_query_destroy;
 253    brw->base.begin_query = brw_query_begin;
 254    brw->base.end_query = brw_query_end;
 255    brw->base.get_query_result = brw_query_get_result;
 256 }
 257
 258
 259 void brw_pipe_query_cleanup( struct brw_context *brw )
 260 {
 261    /* Unreference brw->query.bo ??
 262     */
 263 }