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
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 struct nouveau_heap *current = *heap;
48
49 while (current) {
50 struct nouveau_heap *const next = current->next;
51 free(current);
52 current = next;
53 }
54
55 *heap = NULL;
56 }
57
58 int
nouveau_heap_alloc(struct nouveau_heap * heap,unsigned size,void * priv,struct nouveau_heap ** res)59 nouveau_heap_alloc(struct nouveau_heap *heap, unsigned size, void *priv,
60 struct nouveau_heap **res)
61 {
62 struct nouveau_heap *r;
63
64 if (!heap || !size || !res || *res)
65 return 1;
66
67 while (heap) {
68 if (!heap->in_use && heap->size >= size) {
69 r = calloc(1, sizeof(struct nouveau_heap));
70 if (!r)
71 return 1;
72
73 r->start = (heap->start + heap->size) - size;
74 r->size = size;
75 r->in_use = 1;
76 r->priv = priv;
77
78 heap->size -= size;
79
80 r->next = heap->next;
81 if (heap->next)
82 heap->next->prev = r;
83 r->prev = heap;
84 heap->next = r;
85
86 *res = r;
87 return 0;
88 }
89
90 heap = heap->next;
91 }
92
93 return 1;
94 }
95
96 void
nouveau_heap_free(struct nouveau_heap ** res)97 nouveau_heap_free(struct nouveau_heap **res)
98 {
99 struct nouveau_heap *r;
100
101 if (!res || !*res)
102 return;
103 r = *res;
104 *res = NULL;
105
106 r->in_use = 0;
107
108 if (r->next && !r->next->in_use) {
109 struct nouveau_heap *new = r->next;
110
111 new->prev = r->prev;
112 if (r->prev)
113 r->prev->next = new;
114 new->size += r->size;
115 new->start = r->start;
116
117 free(r);
118 r = new;
119 }
120
121 if (r->prev && !r->prev->in_use) {
122 r->prev->next = r->next;
123 if (r->next)
124 r->next->prev = r->prev;
125 r->prev->size += r->size;
126 free(r);
127 }
128 }
129