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 <drm/drmP.h> 33 34 #if defined(CONFIG_X86) 35 static void 36 drm_clflush_page(struct page *page) 37 { 38 uint8_t *page_virtual; 39 unsigned int i; 40 const int size = boot_cpu_data.x86_clflush_size; 41 42 if (unlikely(page == NULL)) 43 return; 44 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); 49 } 50 51 static void drm_cache_flush_clflush(struct page *pages[], 52 unsigned long num_pages) 53 { 54 unsigned long i; 55 56 mb(); 57 for (i = 0; i < num_pages; i++) 58 drm_clflush_page(*pages++); 59 mb(); 60 } 61 62 static void 63 drm_clflush_ipi_handler(void *null) 64 { 65 wbinvd(); 66 } 67 #endif 68 69 void 70 drm_clflush_pages(struct page *pages[], unsigned long num_pages) 71 { 72 73 #if defined(CONFIG_X86) 74 if (cpu_has_clflush) { 75 drm_cache_flush_clflush(pages, num_pages); 76 return; 77 } 78 79 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) 80 printk(KERN_ERR "Timed out waiting for cache flush.\n"); 81 82 #elif defined(__powerpc__) 83 unsigned long i; 84 for (i = 0; i < num_pages; i++) { 85 struct page *page = pages[i]; 86 void *page_virtual; 87 88 if (unlikely(page == NULL)) 89 continue; 90 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); 95 } 96 #else 97 printk(KERN_ERR "Architecture has no drm_cache.c support\n"); 98 WARN_ON_ONCE(1); 99 #endif 100 } 101 EXPORT_SYMBOL(drm_clflush_pages); 102 103 void 104 drm_clflush_sg(struct sg_table *st) 105 { 106 #if defined(CONFIG_X86) 107 if (cpu_has_clflush) { 108 struct scatterlist *sg; 109 int i; 110 111 mb(); 112 for_each_sg(st->sgl, sg, st->nents, i) 113 drm_clflush_page(sg_page(sg)); 114 mb(); 115 116 return; 117 } 118 119 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) 120 printk(KERN_ERR "Timed out waiting for cache flush.\n"); 121 #else 122 printk(KERN_ERR "Architecture has no drm_cache.c support\n"); 123 WARN_ON_ONCE(1); 124 #endif 125 } 126 EXPORT_SYMBOL(drm_clflush_sg); 127 128 void 129 drm_clflush_virt_range(char *addr, unsigned long length) 130 { 131 #if defined(CONFIG_X86) 132 if (cpu_has_clflush) { 133 char *end = addr + length; 134 mb(); 135 for (; addr < end; addr += boot_cpu_data.x86_clflush_size) 136 clflush(addr); 137 clflush(end - 1); 138 mb(); 139 return; 140 } 141 142 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) 143 printk(KERN_ERR "Timed out waiting for cache flush.\n"); 144 #else 145 printk(KERN_ERR "Architecture has no drm_cache.c support\n"); 146 WARN_ON_ONCE(1); 147 #endif 148 } 149 EXPORT_SYMBOL(drm_clflush_virt_range); 150