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  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. }
  98.