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 #include <machine/md_var.h> 35 #include <machine/cpufunc.h> 36 37 #define cpu_has_clflush 1 38 39 void 40 drm_clflush_virt_range(void *in_addr, unsigned long length) 41 { 42 char *addr = in_addr; 43 if (cpu_has_clflush) { 44 char *end = addr + length; 45 cpu_mfence(); 46 for (; addr < end; addr += cpu_clflush_line_size) 47 clflush((unsigned long)addr); 48 clflush((unsigned long)(end - 1)); 49 cpu_mfence(); 50 return; 51 } 52 53 cpu_wbinvd_on_all_cpus(); 54 } 55 EXPORT_SYMBOL(drm_clflush_virt_range); 56