Root/drivers/gpu/drm/drm_cache.c

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 "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);
45    for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
46        clflush(page_virtual + i);
47    kunmap_atomic(page_virtual);
48}
49
50static 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}
66#endif
67
68void
69drm_clflush_pages(struct page *pages[], unsigned long num_pages)
70{
71
72#if defined(CONFIG_X86)
73    if (cpu_has_clflush) {
74        drm_cache_flush_clflush(pages, num_pages);
75        return;
76    }
77
78    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);
91        flush_dcache_range((unsigned long)page_virtual,
92                   (unsigned long)page_virtual + PAGE_SIZE);
93        kunmap_atomic(page_virtual);
94    }
95#else
96    printk(KERN_ERR "Architecture has no drm_cache.c support\n");
97    WARN_ON_ONCE(1);
98#endif
99}
100EXPORT_SYMBOL(drm_clflush_pages);
101
102void
103drm_clflush_virt_range(char *addr, unsigned long length)
104{
105#if defined(CONFIG_X86)
106    if (cpu_has_clflush) {
107        char *end = addr + length;
108        mb();
109        for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
110            clflush(addr);
111        clflush(end - 1);
112        mb();
113        return;
114    }
115
116    if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
117        printk(KERN_ERR "Timed out waiting for cache flush.\n");
118#else
119    printk(KERN_ERR "Architecture has no drm_cache.c support\n");
120    WARN_ON_ONCE(1);
121#endif
122}
123EXPORT_SYMBOL(drm_clflush_virt_range);
124

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