blob: 0e994a0e46d4cad05d70d0c0760faec5a1b45cb6 [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}
48#endif
49
Eric Anholt673a3942008-07-30 12:06:12 -070050void
51drm_clflush_pages(struct page *pages[], unsigned long num_pages)
52{
53
54#if defined(CONFIG_X86)
55 if (cpu_has_clflush) {
56 unsigned long i;
57
58 mb();
59 for (i = 0; i < num_pages; ++i)
60 drm_clflush_page(*pages++);
61 mb();
62
63 return;
64 }
Eric Anholt673a3942008-07-30 12:06:12 -070065
Dave Airliee0f07542008-10-07 13:41:49 +100066 wbinvd();
67#endif
Eric Anholt673a3942008-07-30 12:06:12 -070068}
69EXPORT_SYMBOL(drm_clflush_pages);