sys/external/bsd/drm/dist/libdrm/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_private.h"
  27
  28 int
  29 nouveau_resource_init(struct nouveau_resource **heap,
  30                       unsigned start, unsigned size)
  31 {
  32         struct nouveau_resource *r;
  33
  34         r = calloc(1, sizeof(struct nouveau_resource));
  35         if (!r)
  36                 return 1;
  37
  38         r->start = start;
  39         r->size  = size;
  40         *heap = r;
  41         return 0;
  42 }
  43
  44 int
  45 nouveau_resource_alloc(struct nouveau_resource *heap, unsigned size, void *priv,
  46                        struct nouveau_resource **res)
  47 {
  48         struct nouveau_resource *r;
  49
  50         if (!heap || !size || !res || *res)
  51                 return 1;
  52
  53         while (heap) {
  54                 if (!heap->in_use && heap->size >= size) {
  55                         r = calloc(1, sizeof(struct nouveau_resource));
  56                         if (!r)
  57                                 return 1;
  58
  59                         r->start  = (heap->start + heap->size) - size;
  60                         r->size   = size;
  61                         r->in_use = 1;
  62                         r->priv   = priv;
  63
  64                         heap->size -= size;
  65
  66                         r->next = heap->next;
  67                         if (heap->next)
  68                                 heap->next->prev = r;
  69                         r->prev = heap;
  70                         heap->next = r;
  71
  72                         *res = r;
  73                         return 0;
  74                 }
  75
  76                 heap = heap->next;
  77         }
  78
  79         return 1;
  80 }
  81
  82 void
  83 nouveau_resource_free(struct nouveau_resource **res)
  84 {
  85         struct nouveau_resource *r;
  86
  87         if (!res || !*res)
  88                 return;
  89         r = *res;
  90         *res = NULL;
  91
  92         r->in_use = 0;
  93
  94         if (r->next && !r->next->in_use) {
  95                 struct nouveau_resource *new = r->next;
  96
  97                 new->prev = r->prev;
  98                 if (r->prev)
  99                         r->prev->next = new;
 100                 new->size += r->size;
 101                 new->start = r->start;
 102
 103                 free(r);
 104                 r = new;
 105         }
 106
 107         if (r->prev && !r->prev->in_use) {
 108                 r->prev->next = r->next;
 109                 if (r->next)
 110                         r->next->prev = r->prev;
 111                 r->prev->size += r->size;
 112                 free(r);
 113         }
 114
 115 }