[net-next-2.6.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);
}

static void drm_cache_flush_clflush(struct page *pages[],
				    unsigned long num_pages)
{
	unsigned long i;

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

static void
drm_clflush_ipi_handler(void *null)
{
	wbinvd();
}
#endif

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

#if defined(CONFIG_X86)
	if (cpu_has_clflush) {
		drm_cache_flush_clflush(pages, num_pages);
		return;
	}

	if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
		printk(KERN_ERR "Timed out waiting for cache flush.\n");

#elif defined(__powerpc__)
	unsigned long i;
	for (i = 0; i < num_pages; i++) {
		struct page *page = pages[i];
		void *page_virtual;

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

		page_virtual = kmap_atomic(page, KM_USER0);
		flush_dcache_range((unsigned long)page_virtual,
				   (unsigned long)page_virtual + PAGE_SIZE);
		kunmap_atomic(page_virtual, KM_USER0);
	}
#else
	printk(KERN_ERR "Architecture has no drm_cache.c support\n");
	WARN_ON_ONCE(1);
#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	}
673a394b	48
c9c97b8c DA	49	static void drm_cache_flush_clflush(struct page *pages[],
	50	unsigned long num_pages)
	51	{
	52	unsigned long i;
	53
	54	mb();
	55	for (i = 0; i < num_pages; i++)
	56	drm_clflush_page(*pages++);
	57	mb();
	58	}
	59
	60	static void
	61	drm_clflush_ipi_handler(void *null)
	62	{
	63	wbinvd();
	64	}
c9c97b8c	65	#endif
ed017d9f	66
673a394b EA	67	void
	68	drm_clflush_pages(struct page *pages[], unsigned long num_pages)
	69	{
	70
	71	#if defined(CONFIG_X86)
	72	if (cpu_has_clflush) {
c9c97b8c	73	drm_cache_flush_clflush(pages, num_pages);
673a394b EA	74	return;
673a394b EA	75	}
673a394b	76
c9c97b8c DA	77	if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
	78	printk(KERN_ERR "Timed out waiting for cache flush.\n");
	79
	80	#elif defined(__powerpc__)
	81	unsigned long i;
	82	for (i = 0; i < num_pages; i++) {
	83	struct page *page = pages[i];
	84	void *page_virtual;
	85
	86	if (unlikely(page == NULL))
	87	continue;
	88
	89	page_virtual = kmap_atomic(page, KM_USER0);
	90	flush_dcache_range((unsigned long)page_virtual,
	91	(unsigned long)page_virtual + PAGE_SIZE);
	92	kunmap_atomic(page_virtual, KM_USER0);
	93	}
	94	#else
ed017d9f DA	95	printk(KERN_ERR "Architecture has no drm_cache.c support\n");
ed017d9f DA	96	WARN_ON_ONCE(1);
e0f0754f	97	#endif
673a394b EA	98	}
673a394b EA	99	EXPORT_SYMBOL(drm_clflush_pages);