[linux-2.6-block.git] / include / drm / drm_mem_util.h

/*
 * Copyright © 2008 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *     Jesse Barnes <jbarnes@virtuousgeek.org>
 *
 */
#ifndef _DRM_MEM_UTIL_H_
#define _DRM_MEM_UTIL_H_

#include <linux/vmalloc.h>

static __inline__ void *drm_calloc_large(size_t nmemb, size_t size)
{
	if (size != 0 && nmemb > SIZE_MAX / size)
		return NULL;

	if (size * nmemb <= PAGE_SIZE)
	    return kcalloc(nmemb, size, GFP_KERNEL);

	return __vmalloc(size * nmemb,
			 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
}

/* Modeled after cairo's malloc_ab, it's like calloc but without the zeroing. */
static __inline__ void *drm_malloc_ab(size_t nmemb, size_t size)
{
	if (size != 0 && nmemb > SIZE_MAX / size)
		return NULL;

	if (size * nmemb <= PAGE_SIZE)
	    return kmalloc(nmemb * size, GFP_KERNEL);

	return __vmalloc(size * nmemb,
			 GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL);
}

static __inline void drm_free_large(void *ptr)
{
	kvfree(ptr);
}

#endif
Commit	Line	Data
72e942dd DA	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	{
a3860c1c	34	if (size != 0 && nmemb > SIZE_MAX / size)
72e942dd DA	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	{
a3860c1c	47	if (size != 0 && nmemb > SIZE_MAX / size)
72e942dd DA	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	{
15e21cd1	59	kvfree(ptr);
72e942dd DA	60	}
	61
	62	#endif