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 #endif 49 50 void 51 drm_clflush_pages(struct page *pages[], unsigned long num_pages) 52 { 53 54 #if defined(CONFIG_X86) 55 if (cpu_has_clflush) { 56 unsigned long i; 57 58 mb(); 59 for (i = 0; i < num_pages; ++i) 60 drm_clflush_page(*pages++); 61 mb(); 62 63 return; 64 } 65 66 wbinvd(); 67 #endif 68 } 69 EXPORT_SYMBOL(drm_clflush_pages); 70