src/mesa/drivers/dri/nouveau/nouveau_scratch.c

   1 /*
   2  * Copyright (C) 2009-2010 Francisco Jerez.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial
  15  * portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  */
  26
  27 #include "nouveau_driver.h"
  28 #include "nouveau_context.h"
  29
  30 /*
  31  * Returns a pointer to a chunk of 'size' bytes long GART memory. 'bo'
  32  * and 'offset' will point to the returned memory.
  33  */
  34 void *
  35 nouveau_get_scratch(struct gl_context *ctx, unsigned size,
  36                     struct nouveau_bo **bo, unsigned *offset)
  37 {
  38         struct nouveau_client *client = context_client(ctx);
  39         struct nouveau_scratch_state *scratch =
  40                 &to_nouveau_context(ctx)->scratch;
  41         void *buf;
  42
  43         if (scratch->buf && size <= NOUVEAU_SCRATCH_SIZE - scratch->offset) {
  44                 nouveau_bo_ref(scratch->bo[scratch->index], bo);
  45
  46                 buf = scratch->buf + scratch->offset;
  47                 *offset = scratch->offset;
  48                 scratch->offset += size;
  49
  50         } else if (size <= NOUVEAU_SCRATCH_SIZE) {
  51                 scratch->index = (scratch->index + 1) % NOUVEAU_SCRATCH_COUNT;
  52                 nouveau_bo_ref(scratch->bo[scratch->index], bo);
  53
  54                 nouveau_bo_map(*bo, NOUVEAU_BO_WR, client);
  55                 buf = scratch->buf = (*bo)->map;
  56
  57                 *offset = 0;
  58                 scratch->offset = size;
  59
  60         } else {
  61                 nouveau_bo_new(context_dev(ctx), NOUVEAU_BO_GART |
  62                                NOUVEAU_BO_MAP, 0, size, NULL, bo);
  63
  64                 nouveau_bo_map(*bo, NOUVEAU_BO_WR, client);
  65                 buf = (*bo)->map;
  66
  67                 *offset = 0;
  68         }
  69
  70         return buf;
  71 }
  72
  73 void
  74 nouveau_scratch_init(struct gl_context *ctx)
  75 {
  76         struct nouveau_scratch_state *scratch =
  77                 &to_nouveau_context(ctx)->scratch;
  78         int ret, i;
  79
  80         for (i = 0; i < NOUVEAU_SCRATCH_COUNT; i++) {
  81                 ret = nouveau_bo_new(context_dev(ctx), NOUVEAU_BO_GART |
  82                                      NOUVEAU_BO_MAP, 0, NOUVEAU_SCRATCH_SIZE,
  83                                      NULL, &scratch->bo[i]);
  84                 assert(!ret);
  85         }
  86 }
  87
  88 void
  89 nouveau_scratch_destroy(struct gl_context *ctx)
  90 {
  91         struct nouveau_scratch_state *scratch =
  92                 &to_nouveau_context(ctx)->scratch;
  93         int i;
  94
  95         for (i = 0; i < NOUVEAU_SCRATCH_COUNT; i++)
  96                 nouveau_bo_ref(NULL, &scratch->bo[i]);
  97 }