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-rw-r--r--include/drm/drm_mem_util.h65
1 files changed, 65 insertions, 0 deletions
diff --git a/include/drm/drm_mem_util.h b/include/drm/drm_mem_util.h
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1/*
2 * Copyright © 2008 Intel Corporation
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 (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Jesse Barnes <jbarnes@virtuousgeek.org>
25 *
26 */
27#ifndef _DRM_MEM_UTIL_H_
28#define _DRM_MEM_UTIL_H_
29
30#include <linux/vmalloc.h>
31
32static __inline__ void *drm_calloc_large(size_t nmemb, size_t size)
33{
34 if (size != 0 && nmemb > ULONG_MAX / size)
35 return NULL;
36
37 if (size * nmemb <= PAGE_SIZE)
38 return kcalloc(nmemb, size, GFP_KERNEL);
39
40 return __vmalloc(size * nmemb,
41 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
42}
43
44/* Modeled after cairo's malloc_ab, it's like calloc but without the zeroing. */
45static __inline__ void *drm_malloc_ab(size_t nmemb, size_t size)
46{
47 if (size != 0 && nmemb > ULONG_MAX / size)
48 return NULL;
49
50 if (size * nmemb <= PAGE_SIZE)
51 return kmalloc(nmemb * size, GFP_KERNEL);
52
53 return __vmalloc(size * nmemb,
54 GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL);
55}
56
57static __inline void drm_free_large(void *ptr)
58{
59 if (!is_vmalloc_addr(ptr))
60 return kfree(ptr);
61
62 vfree(ptr);
63}
64
65#endif