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 <linux/export.h>
32#include <drm/drmP.h>
33
34#if defined(CONFIG_X86)
35#include <asm/smp.h>
36
37/*
38 * clflushopt is an unordered instruction which needs fencing with mfence or
39 * sfence to avoid ordering issues.  For drm_clflush_page this fencing happens
40 * in the caller.
41 */
42static void
43drm_clflush_page(struct page *page)
44{
45	uint8_t *page_virtual;
46	unsigned int i;
47	const int size = boot_cpu_data.x86_clflush_size;
48
49	if (unlikely(page == NULL))
50		return;
51
52	page_virtual = kmap_atomic(page);
53	for (i = 0; i < PAGE_SIZE; i += size)
54		clflushopt(page_virtual + i);
55	kunmap_atomic(page_virtual);
56}
57
58static void drm_cache_flush_clflush(struct page *pages[],
59				    unsigned long num_pages)
60{
61	unsigned long i;
62
63	mb();
64	for (i = 0; i < num_pages; i++)
65		drm_clflush_page(*pages++);
66	mb();
67}
68#endif
69
70void
71drm_clflush_pages(struct page *pages[], unsigned long num_pages)
72{
73
74#if defined(CONFIG_X86)
75	if (cpu_has_clflush) {
76		drm_cache_flush_clflush(pages, num_pages);
77		return;
78	}
79
80	if (wbinvd_on_all_cpus())
81		printk(KERN_ERR "Timed out waiting for cache flush.\n");
82
83#elif defined(__powerpc__)
84	unsigned long i;
85	for (i = 0; i < num_pages; i++) {
86		struct page *page = pages[i];
87		void *page_virtual;
88
89		if (unlikely(page == NULL))
90			continue;
91
92		page_virtual = kmap_atomic(page);
93		flush_dcache_range((unsigned long)page_virtual,
94				   (unsigned long)page_virtual + PAGE_SIZE);
95		kunmap_atomic(page_virtual);
96	}
97#else
98	printk(KERN_ERR "Architecture has no drm_cache.c support\n");
99	WARN_ON_ONCE(1);
100#endif
101}
102EXPORT_SYMBOL(drm_clflush_pages);
103
104void
105drm_clflush_sg(struct sg_table *st)
106{
107#if defined(CONFIG_X86)
108	if (cpu_has_clflush) {
109		struct sg_page_iter sg_iter;
110
111		mb();
112		for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
113			drm_clflush_page(sg_page_iter_page(&sg_iter));
114		mb();
115
116		return;
117	}
118
119	if (wbinvd_on_all_cpus())
120		printk(KERN_ERR "Timed out waiting for cache flush.\n");
121#else
122	printk(KERN_ERR "Architecture has no drm_cache.c support\n");
123	WARN_ON_ONCE(1);
124#endif
125}
126EXPORT_SYMBOL(drm_clflush_sg);
127
128void
129drm_clflush_virt_range(void *addr, unsigned long length)
130{
131#if defined(CONFIG_X86)
132	if (cpu_has_clflush) {
133		void *end = addr + length;
134		mb();
135		for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
136			clflushopt(addr);
137		clflushopt(end - 1);
138		mb();
139		return;
140	}
141
142	if (wbinvd_on_all_cpus())
143		printk(KERN_ERR "Timed out waiting for cache flush.\n");
144#else
145	printk(KERN_ERR "Architecture has no drm_cache.c support\n");
146	WARN_ON_ONCE(1);
147#endif
148}
149EXPORT_SYMBOL(drm_clflush_virt_range);
150