1 /**************************************************************************
3 * Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
28 * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
31 #include <linux/export.h>
34 #if defined(CONFIG_X86)
36 drm_clflush_page(struct page *page)
38 uint8_t *page_virtual;
40 const int size = boot_cpu_data.x86_clflush_size;
42 if (unlikely(page == NULL))
45 page_virtual = kmap_atomic(page);
46 for (i = 0; i < PAGE_SIZE; i += size)
47 clflush(page_virtual + i);
48 kunmap_atomic(page_virtual);
51 static void drm_cache_flush_clflush(struct page *pages[],
52 unsigned long num_pages)
57 for (i = 0; i < num_pages; i++)
58 drm_clflush_page(*pages++);
63 drm_clflush_ipi_handler(void *null)
70 drm_clflush_pages(struct page *pages[], unsigned long num_pages)
73 #if defined(CONFIG_X86)
74 if (cpu_has_clflush) {
75 drm_cache_flush_clflush(pages, num_pages);
79 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
80 printk(KERN_ERR "Timed out waiting for cache flush.\n");
82 #elif defined(__powerpc__)
84 for (i = 0; i < num_pages; i++) {
85 struct page *page = pages[i];
88 if (unlikely(page == NULL))
91 page_virtual = kmap_atomic(page);
92 flush_dcache_range((unsigned long)page_virtual,
93 (unsigned long)page_virtual + PAGE_SIZE);
94 kunmap_atomic(page_virtual);
97 printk(KERN_ERR "Architecture has no drm_cache.c support\n");
101 EXPORT_SYMBOL(drm_clflush_pages);
104 drm_clflush_sg(struct sg_table *st)
106 #if defined(CONFIG_X86)
107 if (cpu_has_clflush) {
108 struct scatterlist *sg;
112 for_each_sg(st->sgl, sg, st->nents, i)
113 drm_clflush_page(sg_page(sg));
119 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
120 printk(KERN_ERR "Timed out waiting for cache flush.\n");
122 printk(KERN_ERR "Architecture has no drm_cache.c support\n");
126 EXPORT_SYMBOL(drm_clflush_sg);
129 drm_clflush_virt_range(char *addr, unsigned long length)
131 #if defined(CONFIG_X86)
132 if (cpu_has_clflush) {
133 char *end = addr + length;
135 for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
142 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
143 printk(KERN_ERR "Timed out waiting for cache flush.\n");
145 printk(KERN_ERR "Architecture has no drm_cache.c support\n");
149 EXPORT_SYMBOL(drm_clflush_virt_range);