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_heap.h"
27
28 int
nouveau_heap_init(struct nouveau_heap ** heap,unsigned start,unsigned size)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
nouveau_heap_destroy(struct nouveau_heap ** heap)45 nouveau_heap_destroy(struct nouveau_heap **heap)
46 {
47 if (!*heap)
48 return;
49 free(*heap);
50 *heap = NULL;
51 }
52
53 int
nouveau_heap_alloc(struct nouveau_heap * heap,unsigned size,void * priv,struct nouveau_heap ** res)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
nouveau_heap_free(struct nouveau_heap ** res)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 }
124