src/gallium/winsys/dri/nouveau/nouveau_resource.c

   1 /*
   2  * Copyright 2007 Nouveau Project
   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 shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  18  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  19  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22
  23 #include <stdlib.h>
  24 #include <errno.h>
  25
  26 #include "nouveau_drmif.h"
  27 #include "nouveau_local.h"
  28
  29 int
  30 nouveau_resource_init(struct nouveau_resource **heap,
  31                       unsigned start, unsigned size)
  32 {
  33         struct nouveau_resource *r;
  34
  35         r = calloc(1, sizeof(struct nouveau_resource));
  36         if (!r)
  37                 return 1;
  38
  39         r->start = start;
  40         r->size  = size;
  41         *heap = r;
  42         return 0;
  43 }
  44
  45 int
  46 nouveau_resource_alloc(struct nouveau_resource *heap, int size, void *priv,
  47                        struct nouveau_resource **res)
  48 {
  49         struct nouveau_resource *r;
  50
  51         if (!heap || !size || !res || *res)
  52                 return 1;
  53
  54         while (heap) {
  55                 if (!heap->in_use && heap->size >= size) {
  56                         r = calloc(1, sizeof(struct nouveau_resource));
  57                         if (!r)
  58                                 return 1;
  59
  60                         r->start  = (heap->start + heap->size) - size;
  61                         r->size   = size;
  62                         r->in_use = 1;
  63                         r->priv   = priv;
  64
  65                         heap->size -= size;
  66
  67                         r->next = heap->next;
  68                         if (heap->next)
  69                                 heap->next->prev = r;
  70                         r->prev = heap;
  71                         heap->next = r;
  72
  73                         *res = r;
  74                         return 0;
  75                 }
  76
  77                 heap = heap->next;
  78         }
  79
  80         return 1;
  81 }
  82
  83 void
  84 nouveau_resource_free(struct nouveau_resource **res)
  85 {
  86         struct nouveau_resource *r;
  87
  88         if (!res || !*res)
  89                 return;
  90         r = *res;
  91         *res = NULL;
  92
  93         r->in_use = 0;
  94
  95         if (r->next && !r->next->in_use) {
  96                 struct nouveau_resource *new = r->next;
  97
  98                 new->prev = r->prev;
  99                 if (r->prev)
 100                         r->prev->next = new;
 101                 new->size += r->size;
 102                 new->start = r->start;
 103
 104                 free(r);
 105                 r = new;
 106         }
 107
 108         if (r->prev && !r->prev->in_use) {
 109                 r->prev->next = r->next;
 110                 if (r->next)
 111                         r->next->prev = r->prev;
 112                 r->prev->size += r->size;
 113                 free(r);
 114         }
 115
 116 }