[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpu / drm / drm_cache.c

/**************************************************************************
 *
 * Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
 */

#include "drmP.h"

#if defined(CONFIG_X86)
static void
drm_clflush_page(struct page *page)
{
	uint8_t *page_virtual;
	unsigned int i;

	if (unlikely(page == NULL))
		return;

	page_virtual = kmap_atomic(page, KM_USER0);
	for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
		clflush(page_virtual + i);
	kunmap_atomic(page_virtual, KM_USER0);
}
#endif

void
drm_clflush_pages(struct page *pages[], unsigned long num_pages)
{

#if defined(CONFIG_X86)
	if (cpu_has_clflush) {
		unsigned long i;

		mb();
		for (i = 0; i < num_pages; ++i)
			drm_clflush_page(*pages++);
		mb();

		return;
	}

	wbinvd();
#endif
}
EXPORT_SYMBOL(drm_clflush_pages);
Commit	Line	Data
673a394b EA	1	/**************************************************************************
	2	*
	3	* Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
	4	* All Rights Reserved.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the
	8	* "Software"), to deal in the Software without restriction, including
	9	* without limitation the rights to use, copy, modify, merge, publish,
	10	* distribute, sub license, and/or sell copies of the Software, and to
	11	* permit persons to whom the Software is furnished to do so, subject to
	12	* the following conditions:
	13	*
	14	* The above copyright notice and this permission notice (including the
	15	* next paragraph) shall be included in all copies or substantial portions
	16	* of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	21	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	22	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	25	*
	26	**************************************************************************/
	27	/*
	28	* Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
	29	*/
	30
	31	#include "drmP.h"
	32
	33	#if defined(CONFIG_X86)
	34	static void
	35	drm_clflush_page(struct page *page)
	36	{
	37	uint8_t *page_virtual;
	38	unsigned int i;
	39
	40	if (unlikely(page == NULL))
	41	return;
	42
	43	page_virtual = kmap_atomic(page, KM_USER0);
	44	for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
	45	clflush(page_virtual + i);
	46	kunmap_atomic(page_virtual, KM_USER0);
	47	}
	48	#endif
	49
673a394b EA	50	void
	51	drm_clflush_pages(struct page *pages[], unsigned long num_pages)
	52	{
	53
	54	#if defined(CONFIG_X86)
	55	if (cpu_has_clflush) {
	56	unsigned long i;
	57
	58	mb();
	59	for (i = 0; i < num_pages; ++i)
	60	drm_clflush_page(*pages++);
	61	mb();
	62
	63	return;
	64	}
673a394b	65
e0f0754f DA	66	wbinvd();
e0f0754f DA	67	#endif
673a394b EA	68	}
673a394b EA	69	EXPORT_SYMBOL(drm_clflush_pages);