linux/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 > SIZE_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 > SIZE_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
  66
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