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_scratch_state *scratch =
  39                 &to_nouveau_context(ctx)->scratch;
  40         void *buf;
  41
  42         if (scratch->buf && size <= NOUVEAU_SCRATCH_SIZE - scratch->offset) {
  43                 nouveau_bo_ref(scratch->bo[scratch->index], bo);
  44
  45                 buf = scratch->buf + scratch->offset;
  46                 *offset = scratch->offset;
  47                 scratch->offset += size;
  48
  49         } else if (size <= NOUVEAU_SCRATCH_SIZE) {
  50                 scratch->index = (scratch->index + 1) % NOUVEAU_SCRATCH_COUNT;
  51                 nouveau_bo_ref(scratch->bo[scratch->index], bo);
  52
  53                 nouveau_bo_map(*bo, NOUVEAU_BO_WR);
  54                 buf = scratch->buf = (*bo)->map;
  55                 nouveau_bo_unmap(*bo);
  56
  57                 *offset = 0;
  58                 scratch->offset = size;
  59
  60         } else {
  61                 nouveau_bo_new(context_dev(ctx),
  62                                NOUVEAU_BO_MAP | NOUVEAU_BO_GART, 0, size, bo);
  63
  64                 nouveau_bo_map(*bo, NOUVEAU_BO_WR);
  65                 buf = (*bo)->map;
  66                 nouveau_bo_unmap(*bo);
  67
  68                 *offset = 0;
  69         }
  70
  71         return buf;
  72 }
  73
  74 void
  75 nouveau_scratch_init(struct gl_context *ctx)
  76 {
  77         struct nouveau_scratch_state *scratch =
  78                 &to_nouveau_context(ctx)->scratch;
  79         int ret, i;
  80
  81         for (i = 0; i < NOUVEAU_SCRATCH_COUNT; i++) {
  82                 ret = nouveau_bo_new(context_dev(ctx),
  83                                      NOUVEAU_BO_MAP | NOUVEAU_BO_GART,
  84                                      0, NOUVEAU_SCRATCH_SIZE, &scratch->bo[i]);
  85                 assert(!ret);
  86         }
  87 }
  88
  89 void
  90 nouveau_scratch_destroy(struct gl_context *ctx)
  91 {
  92         struct nouveau_scratch_state *scratch =
  93                 &to_nouveau_context(ctx)->scratch;
  94         int i;
  95
  96         for (i = 0; i < NOUVEAU_SCRATCH_COUNT; i++)
  97                 nouveau_bo_ref(NULL, &scratch->bo[i]);
  98 }