src/gallium/drivers/nouveau/nouveau_heap.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 OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  */
  22
  23 #include <stdlib.h>
  24 #include <errno.h>
  25
  26 #include "nouveau_heap.h"
  27
  28 int
  29 nouveau_heap_init(struct nouveau_heap **heap,
  30                   unsigned start, unsigned size)
  31 {
  32    struct nouveau_heap *r;
  33
  34    r = calloc(1, sizeof(struct nouveau_heap));
  35    if (!r)
  36       return 1;
  37
  38    r->start = start;
  39    r->size  = size;
  40    *heap = r;
  41    return 0;
  42 }
  43
  44 void
  45 nouveau_heap_destroy(struct nouveau_heap **heap)
  46 {
  47    if (!*heap)
  48       return;
  49    free(*heap);
  50    *heap = NULL;
  51 }
  52
  53 int
  54 nouveau_heap_alloc(struct nouveau_heap *heap, unsigned size, void *priv,
  55                    struct nouveau_heap **res)
  56 {
  57    struct nouveau_heap *r;
  58
  59    if (!heap || !size || !res || *res)
  60       return 1;
  61
  62    while (heap) {
  63       if (!heap->in_use && heap->size >= size) {
  64          r = calloc(1, sizeof(struct nouveau_heap));
  65          if (!r)
  66             return 1;
  67
  68          r->start  = (heap->start + heap->size) - size;
  69          r->size   = size;
  70          r->in_use = 1;
  71          r->priv   = priv;
  72
  73          heap->size -= size;
  74
  75          r->next = heap->next;
  76          if (heap->next)
  77             heap->next->prev = r;
  78          r->prev = heap;
  79          heap->next = r;
  80
  81          *res = r;
  82          return 0;
  83       }
  84
  85       heap = heap->next;
  86    }
  87
  88    return 1;
  89 }
  90
  91 void
  92 nouveau_heap_free(struct nouveau_heap **res)
  93 {
  94    struct nouveau_heap *r;
  95
  96    if (!res || !*res)
  97       return;
  98    r = *res;
  99    *res = NULL;
 100
 101    r->in_use = 0;
 102
 103    if (r->next && !r->next->in_use) {
 104       struct nouveau_heap *new = r->next;
 105
 106       new->prev = r->prev;
 107       if (r->prev)
 108          r->prev->next = new;
 109       new->size += r->size;
 110       new->start = r->start;
 111
 112       free(r);
 113       r = new;
 114    }
 115
 116    if (r->prev && !r->prev->in_use) {
 117       r->prev->next = r->next;
 118       if (r->next)
 119          r->next->prev = r->prev;
 120       r->prev->size += r->size;
 121       free(r);
 122    }
 123 }