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) 35 static void 36 drm_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 } 49 50 static 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 61 static void 62 drm_clflush_ipi_handler(void *null) 63 { 64 wbinvd(); 65 } 66 #endif 67 68 void 69 drm_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, 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 96 printk(KERN_ERR "Architecture has no drm_cache.c support\n"); 97 WARN_ON_ONCE(1); 98 #endif 99 } 100 EXPORT_SYMBOL(drm_clflush_pages); 101