include/drm/drm_mem_util.h

   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
  32 static __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. */
  45 static __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
  57 static __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