blob: 534cb89b160d686d60218dad53082be9b0f331ea [file] [log] [blame]
Eric Anholt673a3942008-07-30 12:06:12 -07001/**************************************************************************
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
Paul Gortmaker2d1a8a42011-08-30 18:16:33 -040031#include <linux/export.h>
David Howells760285e2012-10-02 18:01:07 +010032#include <drm/drmP.h>
Eric Anholt673a3942008-07-30 12:06:12 -070033
34#if defined(CONFIG_X86)
Ross Zwisler2a0c7722014-02-26 12:06:51 -070035
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 */
Eric Anholt673a3942008-07-30 12:06:12 -070041static void
42drm_clflush_page(struct page *page)
43{
44 uint8_t *page_virtual;
45 unsigned int i;
Dave Airlie87229ad2012-09-19 11:12:41 +100046 const int size = boot_cpu_data.x86_clflush_size;
Eric Anholt673a3942008-07-30 12:06:12 -070047
48 if (unlikely(page == NULL))
49 return;
50
Cong Wang1c9c20f2011-11-25 23:14:20 +080051 page_virtual = kmap_atomic(page);
Dave Airlie87229ad2012-09-19 11:12:41 +100052 for (i = 0; i < PAGE_SIZE; i += size)
Ross Zwisler2a0c7722014-02-26 12:06:51 -070053 clflushopt(page_virtual + i);
Cong Wang1c9c20f2011-11-25 23:14:20 +080054 kunmap_atomic(page_virtual);
Eric Anholt673a3942008-07-30 12:06:12 -070055}
Eric Anholt673a3942008-07-30 12:06:12 -070056
Dave Airliec9c97b82009-08-27 09:53:47 +100057static 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}
Dave Airliec9c97b82009-08-27 09:53:47 +100073#endif
Dave Airlieed017d92009-09-02 09:41:13 +100074
Eric Anholt673a3942008-07-30 12:06:12 -070075void
76drm_clflush_pages(struct page *pages[], unsigned long num_pages)
77{
78
79#if defined(CONFIG_X86)
80 if (cpu_has_clflush) {
Dave Airliec9c97b82009-08-27 09:53:47 +100081 drm_cache_flush_clflush(pages, num_pages);
Eric Anholt673a3942008-07-30 12:06:12 -070082 return;
83 }
Eric Anholt673a3942008-07-30 12:06:12 -070084
Dave Airliec9c97b82009-08-27 09:53:47 +100085 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
Cong Wang1c9c20f2011-11-25 23:14:20 +080097 page_virtual = kmap_atomic(page);
Dave Airliec9c97b82009-08-27 09:53:47 +100098 flush_dcache_range((unsigned long)page_virtual,
99 (unsigned long)page_virtual + PAGE_SIZE);
Cong Wang1c9c20f2011-11-25 23:14:20 +0800100 kunmap_atomic(page_virtual);
Dave Airliec9c97b82009-08-27 09:53:47 +1000101 }
102#else
Dave Airlieed017d92009-09-02 09:41:13 +1000103 printk(KERN_ERR "Architecture has no drm_cache.c support\n");
104 WARN_ON_ONCE(1);
Dave Airliee0f07542008-10-07 13:41:49 +1000105#endif
Eric Anholt673a3942008-07-30 12:06:12 -0700106}
107EXPORT_SYMBOL(drm_clflush_pages);
Daniel Vetter6d5cd9c2012-03-25 19:47:30 +0200108
109void
Chris Wilson9da3da62012-06-01 15:20:22 +0100110drm_clflush_sg(struct sg_table *st)
111{
112#if defined(CONFIG_X86)
113 if (cpu_has_clflush) {
Imre Deakf5ddf692013-02-18 19:28:01 +0200114 struct sg_page_iter sg_iter;
Chris Wilson9da3da62012-06-01 15:20:22 +0100115
116 mb();
Imre Deakf5ddf692013-02-18 19:28:01 +0200117 for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
Imre Deak2db76d72013-03-26 15:14:18 +0200118 drm_clflush_page(sg_page_iter_page(&sg_iter));
Chris Wilson9da3da62012-06-01 15:20:22 +0100119 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
Daniel Vetter6d5cd9c2012-03-25 19:47:30 +0200134drm_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);
Ross Zwisler2a0788d2014-02-26 12:06:52 -0700142 clflushopt(end - 1);
Daniel Vetter6d5cd9c2012-03-25 19:47:30 +0200143 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);