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