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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)
34static void
35drm_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
49static 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
60static void
61drm_clflush_ipi_handler(void *null)
62{
63 wbinvd();
64}
65#endif
66
67void
68drm_clflush_pages(struct page *pages[], unsigned long num_pages)
69{
70
71#if defined(CONFIG_X86)
72 if (cpu_has_clflush) {
73 drm_cache_flush_clflush(pages, num_pages);
74 return;
75 }
76
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
95 printk(KERN_ERR "Architecture has no drm_cache.c support\n");
96 WARN_ON_ONCE(1);
97#endif
98}
99EXPORT_SYMBOL(drm_clflush_pages);
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
36/*
37 * clflushopt is an unordered instruction which needs fencing with mfence or
38 * sfence to avoid ordering issues. For drm_clflush_page this fencing happens
39 * in the caller.
40 */
41static void
42drm_clflush_page(struct page *page)
43{
44 uint8_t *page_virtual;
45 unsigned int i;
46 const int size = boot_cpu_data.x86_clflush_size;
47
48 if (unlikely(page == NULL))
49 return;
50
51 page_virtual = kmap_atomic(page);
52 for (i = 0; i < PAGE_SIZE; i += size)
53 clflushopt(page_virtual + i);
54 kunmap_atomic(page_virtual);
55}
56
57static void drm_cache_flush_clflush(struct page *pages[],
58 unsigned long num_pages)
59{
60 unsigned long i;
61
62 mb();
63 for (i = 0; i < num_pages; i++)
64 drm_clflush_page(*pages++);
65 mb();
66}
67
68static void
69drm_clflush_ipi_handler(void *null)
70{
71 wbinvd();
72}
73#endif
74
75void
76drm_clflush_pages(struct page *pages[], unsigned long num_pages)
77{
78
79#if defined(CONFIG_X86)
80 if (cpu_has_clflush) {
81 drm_cache_flush_clflush(pages, num_pages);
82 return;
83 }
84
85 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
86 printk(KERN_ERR "Timed out waiting for cache flush.\n");
87
88#elif defined(__powerpc__)
89 unsigned long i;
90 for (i = 0; i < num_pages; i++) {
91 struct page *page = pages[i];
92 void *page_virtual;
93
94 if (unlikely(page == NULL))
95 continue;
96
97 page_virtual = kmap_atomic(page);
98 flush_dcache_range((unsigned long)page_virtual,
99 (unsigned long)page_virtual + PAGE_SIZE);
100 kunmap_atomic(page_virtual);
101 }
102#else
103 printk(KERN_ERR "Architecture has no drm_cache.c support\n");
104 WARN_ON_ONCE(1);
105#endif
106}
107EXPORT_SYMBOL(drm_clflush_pages);
108
109void
110drm_clflush_sg(struct sg_table *st)
111{
112#if defined(CONFIG_X86)
113 if (cpu_has_clflush) {
114 struct sg_page_iter sg_iter;
115
116 mb();
117 for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
118 drm_clflush_page(sg_page_iter_page(&sg_iter));
119 mb();
120
121 return;
122 }
123
124 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
125 printk(KERN_ERR "Timed out waiting for cache flush.\n");
126#else
127 printk(KERN_ERR "Architecture has no drm_cache.c support\n");
128 WARN_ON_ONCE(1);
129#endif
130}
131EXPORT_SYMBOL(drm_clflush_sg);
132
133void
134drm_clflush_virt_range(char *addr, unsigned long length)
135{
136#if defined(CONFIG_X86)
137 if (cpu_has_clflush) {
138 char *end = addr + length;
139 mb();
140 for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
141 clflush(addr);
142 clflushopt(end - 1);
143 mb();
144 return;
145 }
146
147 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
148 printk(KERN_ERR "Timed out waiting for cache flush.\n");
149#else
150 printk(KERN_ERR "Architecture has no drm_cache.c support\n");
151 WARN_ON_ONCE(1);
152#endif
153}
154EXPORT_SYMBOL(drm_clflush_virt_range);