Release 4.14 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 <linux/export.h>
#include <linux/highmem.h>

#include <drm/drm_cache.h>

#if defined(CONFIG_X86)
#include <asm/smp.h>

/*
 * clflushopt is an unordered instruction which needs fencing with mfence or
 * sfence to avoid ordering issues.  For drm_clflush_page this fencing happens
 * in the caller.
 */

static void

drm_clflush_page(struct page *page)
{
	uint8_t *page_virtual;
	unsigned int i;
	const int size = boot_cpu_data.x86_clflush_size;

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

	page_virtual = kmap_atomic(page);
	for (i = 0; i < PAGE_SIZE; i += size)
		clflushopt(page_virtual + i);
	kunmap_atomic(page_virtual);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Anholt
60
85.71%
1
33.33%
Dave Airlie
9
12.86%
1
33.33%
Ross Zwisler
1
1.43%
1
33.33%
Total
70
100.00%
3
100.00%



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();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Airlie
46
100.00%
1
100.00%
Total
46
100.00%
1
100.00%

#endif

/**
 * drm_clflush_pages - Flush dcache lines of a set of pages.
 * @pages: List of pages to be flushed.
 * @num_pages: Number of pages in the array.
 *
 * Flush every data cache line entry that points to an address belonging
 * to a page in the array.
 */

void

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

#if defined(CONFIG_X86)
	if (static_cpu_has(X86_FEATURE_CLFLUSH)) {
		drm_cache_flush_clflush(pages, num_pages);
		return;
	}

	if (wbinvd_on_all_cpus())
		pr_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);
		flush_dcache_range((unsigned long)page_virtual,
				   (unsigned long)page_virtual + PAGE_SIZE);
		kunmap_atomic(page_virtual);
	}
#else
	pr_err("Architecture has no drm_cache.c support\n");
	WARN_ON_ONCE(1);
#endif
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Airlie
83
59.29%
3
42.86%
Eric Anholt
48
34.29%
1
14.29%
Borislav Petkov
4
2.86%
1
14.29%
Joe Perches
3
2.14%
1
14.29%
Ben Widawsky
2
1.43%
1
14.29%
Total
140
100.00%
7
100.00%


EXPORT_SYMBOL(drm_clflush_pages);

/**
 * drm_clflush_sg - Flush dcache lines pointing to a scather-gather.
 * @st: struct sg_table.
 *
 * Flush every data cache line entry that points to an address in the
 * sg.
 */

void

drm_clflush_sg(struct sg_table *st)
{
#if defined(CONFIG_X86)
	if (static_cpu_has(X86_FEATURE_CLFLUSH)) {
		struct sg_page_iter sg_iter;

		mb();
		for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
			drm_clflush_page(sg_page_iter_page(&sg_iter));
		mb();

		return;
	}

	if (wbinvd_on_all_cpus())
		pr_err("Timed out waiting for cache flush\n");
#else
	pr_err("Architecture has no drm_cache.c support\n");
	WARN_ON_ONCE(1);
#endif
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
59
74.68%
1
14.29%
Imre Deak
10
12.66%
2
28.57%
Borislav Petkov
4
5.06%
1
14.29%
Joe Perches
3
3.80%
1
14.29%
Ben Widawsky
2
2.53%
1
14.29%
Daniel Vetter
1
1.27%
1
14.29%
Total
79
100.00%
7
100.00%


EXPORT_SYMBOL(drm_clflush_sg);

/**
 * drm_clflush_virt_range - Flush dcache lines of a region
 * @addr: Initial kernel memory address.
 * @length: Region size.
 *
 * Flush every data cache line entry that points to an address in the
 * region requested.
 */

void

drm_clflush_virt_range(void *addr, unsigned long length)
{
#if defined(CONFIG_X86)
	if (static_cpu_has(X86_FEATURE_CLFLUSH)) {
		const int size = boot_cpu_data.x86_clflush_size;
		void *end = addr + length;
		addr = (void *)(((unsigned long)addr) & -size);
		mb();
		for (; addr < end; addr += size)
			clflushopt(addr);
		clflushopt(end - 1); /* force serialisation */
		mb();
		return;
	}

	if (wbinvd_on_all_cpus())
		pr_err("Timed out waiting for cache flush\n");
#else
	pr_err("Architecture has no drm_cache.c support\n");
	WARN_ON_ONCE(1);
#endif
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
69
58.47%
1
11.11%
Chris Wilson
37
31.36%
3
33.33%
Borislav Petkov
4
3.39%
1
11.11%
Joe Perches
3
2.54%
1
11.11%
Ben Widawsky
2
1.69%
1
11.11%
Ville Syrjälä
2
1.69%
1
11.11%
Ross Zwisler
1
0.85%
1
11.11%
Total
118
100.00%
9
100.00%


EXPORT_SYMBOL(drm_clflush_virt_range);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Airlie
138
27.94%
4
20.00%
Eric Anholt
125
25.30%
1
5.00%
Chris Wilson
105
21.26%
4
20.00%
Daniel Vetter
75
15.18%
1
5.00%
Borislav Petkov
12
2.43%
1
5.00%
Imre Deak
10
2.02%
2
10.00%
Ben Widawsky
9
1.82%
1
5.00%
Joe Perches
9
1.82%
1
5.00%
Paul Gortmaker
3
0.61%
1
5.00%
Ross Zwisler
3
0.61%
2
10.00%
Gabriel Krisman Bertazi
3
0.61%
1
5.00%
Ville Syrjälä
2
0.40%
1
5.00%
Total
494
100.00%
20
100.00%
Directory: drivers/gpu/drm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.