150477Speter/*
231706Spst * Copyright 2007 Nouveau Project
326931Smsmith *
41590Srgrimes * Permission is hereby granted, free of charge, to any person obtaining a
5160750Syar * copy of this software and associated documentation files (the "Software"),
6160750Syar * to deal in the Software without restriction, including without limitation
731706Spst * the rights to use, copy, modify, merge, publish, distribute, sublicense,
831706Spst * and/or sell copies of the Software, and to permit persons to whom the
931706Spst * Software is furnished to do so, subject to the following conditions:
1031706Spst *
11223328Sgavin * The above copyright notice and this permission notice shall be included in
12223328Sgavin * all copies or substantial portions of the Software.
1387824Smikeh *
141590Srgrimes * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15223328Sgavin * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16223328Sgavin * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
171590Srgrimes * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
18160750Syar * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
19160750Syar * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20160750Syar * SOFTWARE.
21160750Syar */
22223328Sgavin
23125503Sru#include <stdlib.h>
24125503Sru#include <errno.h>
2526931Smsmith
26201386Sed#include "nouveau_private.h"
27201386Sed
2831706Spstint
2931706Spstnouveau_resource_init(struct nouveau_resource **heap,
3031706Spst		      unsigned start, unsigned size)
3131706Spst{
3226931Smsmith	struct nouveau_resource *r;
331590Srgrimes
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
44int
45nouveau_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
82void
83nouveau_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}
116