blob: 592865381c6e84acb5ec66fef2e865e897d586e0 [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>
Eric Anholt673a3942008-07-30 12:06:12 -070032#include "drmP.h"
33
34#if defined(CONFIG_X86)
35static void
36drm_clflush_page(struct page *page)
37{
38 uint8_t *page_virtual;
39 unsigned int i;
40
41 if (unlikely(page == NULL))
42 return;
43
44 page_virtual = kmap_atomic(page, KM_USER0);
45 for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
46 clflush(page_virtual + i);
47 kunmap_atomic(page_virtual, KM_USER0);
48}
Eric Anholt673a3942008-07-30 12:06:12 -070049
Dave Airliec9c97b82009-08-27 09:53:47 +100050static void drm_cache_flush_clflush(struct page *pages[],
51 unsigned long num_pages)
52{
53 unsigned long i;
54
55 mb();
56 for (i = 0; i < num_pages; i++)
57 drm_clflush_page(*pages++);
58 mb();
59}
60
61static void
62drm_clflush_ipi_handler(void *null)
63{
64 wbinvd();
65}
Dave Airliec9c97b82009-08-27 09:53:47 +100066#endif
Dave Airlieed017d92009-09-02 09:41:13 +100067
Eric Anholt673a3942008-07-30 12:06:12 -070068void
69drm_clflush_pages(struct page *pages[], unsigned long num_pages)
70{
71
72#if defined(CONFIG_X86)
73 if (cpu_has_clflush) {
Dave Airliec9c97b82009-08-27 09:53:47 +100074 drm_cache_flush_clflush(pages, num_pages);
Eric Anholt673a3942008-07-30 12:06:12 -070075 return;
76 }
Eric Anholt673a3942008-07-30 12:06:12 -070077
Dave Airliec9c97b82009-08-27 09:53:47 +100078 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
79 printk(KERN_ERR "Timed out waiting for cache flush.\n");
80
81#elif defined(__powerpc__)
82 unsigned long i;
83 for (i = 0; i < num_pages; i++) {
84 struct page *page = pages[i];
85 void *page_virtual;
86
87 if (unlikely(page == NULL))
88 continue;
89
90 page_virtual = kmap_atomic(page, KM_USER0);
91 flush_dcache_range((unsigned long)page_virtual,
92 (unsigned long)page_virtual + PAGE_SIZE);
93 kunmap_atomic(page_virtual, KM_USER0);
94 }
95#else
Dave Airlieed017d92009-09-02 09:41:13 +100096 printk(KERN_ERR "Architecture has no drm_cache.c support\n");
97 WARN_ON_ONCE(1);
Dave Airliee0f07542008-10-07 13:41:49 +100098#endif
Eric Anholt673a3942008-07-30 12:06:12 -070099}
100EXPORT_SYMBOL(drm_clflush_pages);