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 "drmP.h" 32 33 #if defined(CONFIG_X86) 34 static void 35 drm_clflush_page(struct page *page) 36 { 37 uint8_t *page_virtual; 38 unsigned int i; 39 40 if (unlikely(page == NULL)) 41 return; 42 43 page_virtual = kmap_atomic(page, KM_USER0); 44 for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size) 45 clflush(page_virtual + i); 46 kunmap_atomic(page_virtual, KM_USER0); 47 } 48 49 static void drm_cache_flush_clflush(struct page *pages[], 50 unsigned long num_pages) 51 { 52 unsigned long i; 53 54 mb(); 55 for (i = 0; i < num_pages; i++) 56 drm_clflush_page(*pages++); 57 mb(); 58 } 59 60 static void 61 drm_clflush_ipi_handler(void *null) 62 { 63 wbinvd(); 64 } 65 #endif 66 67 void 68 drm_clflush_pages(struct page *pages[], unsigned long num_pages) 69 { 70 71 #if defined(CONFIG_X86) 72 if (cpu_has_clflush) { 73 drm_cache_flush_clflush(pages, num_pages); 74 return; 75 } 76 77 if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) 78 printk(KERN_ERR "Timed out waiting for cache flush.\n"); 79 80 #elif defined(__powerpc__) 81 unsigned long i; 82 for (i = 0; i < num_pages; i++) { 83 struct page *page = pages[i]; 84 void *page_virtual; 85 86 if (unlikely(page == NULL)) 87 continue; 88 89 page_virtual = kmap_atomic(page, KM_USER0); 90 flush_dcache_range((unsigned long)page_virtual, 91 (unsigned long)page_virtual + PAGE_SIZE); 92 kunmap_atomic(page_virtual, KM_USER0); 93 } 94 #else 95 printk(KERN_ERR "Architecture has no drm_cache.c support\n"); 96 WARN_ON_ONCE(1); 97 #endif 98 } 99 EXPORT_SYMBOL(drm_clflush_pages); 100