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      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 }
    124