blob: 0e3bd5b54b78c57ba7fcf3df524aedaa32bf366e [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
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}
Eric Anholt673a3942008-07-30 12:06:12 -070048
Dave Airliec9c97b82009-08-27 09:53:47 +100049static 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}
Dave Airliec9c97b82009-08-27 09:53:47 +100065#endif
Dave Airlieed017d92009-09-02 09:41:13 +100066
Eric Anholt673a3942008-07-30 12:06:12 -070067void
68drm_clflush_pages(struct page *pages[], unsigned long num_pages)
69{
70
71#if defined(CONFIG_X86)
72 if (cpu_has_clflush) {
Dave Airliec9c97b82009-08-27 09:53:47 +100073 drm_cache_flush_clflush(pages, num_pages);
Eric Anholt673a3942008-07-30 12:06:12 -070074 return;
75 }
Eric Anholt673a3942008-07-30 12:06:12 -070076
Dave Airliec9c97b82009-08-27 09:53:47 +100077 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
Dave Airlieed017d92009-09-02 09:41:13 +100095 printk(KERN_ERR "Architecture has no drm_cache.c support\n");
96 WARN_ON_ONCE(1);
Dave Airliee0f07542008-10-07 13:41:49 +100097#endif
Eric Anholt673a3942008-07-30 12:06:12 -070098}
99EXPORT_SYMBOL(drm_clflush_pages);