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 #include <asm/cpufeature.h> 34 35 #include <machine/md_var.h> 36 #include <machine/cpufunc.h> 37 38 /* 39 * clflushopt is an unordered instruction which needs fencing with mfence or 40 * sfence to avoid ordering issues. For drm_clflush_page this fencing happens 41 * in the caller. 42 */ 43 static void 44 drm_clflush_page(struct vm_page *page) 45 { 46 uint8_t *page_virtual; 47 unsigned int i; 48 const int size = cpu_clflush_line_size; 49 50 if (unlikely(page == NULL)) 51 return; 52 53 page_virtual = kmap_atomic(page); 54 for (i = 0; i < PAGE_SIZE; i += size) 55 clflush((u_long)(page_virtual + i)); 56 kunmap_atomic(page_virtual); 57 } 58 59 void 60 drm_clflush_pages(vm_page_t *pages, unsigned long num_pages) 61 { 62 pmap_invalidate_cache_pages(pages, num_pages); 63 } 64 65 void 66 drm_clflush_sg(struct sg_table *st) 67 { 68 if (cpu_has_clflush) { 69 struct sg_page_iter sg_iter; 70 71 mb(); 72 for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) 73 drm_clflush_page(sg_page_iter_page(&sg_iter)); 74 mb(); 75 76 return; 77 } 78 79 cpu_wbinvd_on_all_cpus(); 80 } 81 EXPORT_SYMBOL(drm_clflush_sg); 82 83 void 84 drm_clflush_virt_range(void *in_addr, unsigned long length) 85 { 86 char *addr = in_addr; 87 88 if (cpu_has_clflush) { 89 const int size = cpu_clflush_line_size; 90 char *end = addr + length; 91 addr = (void *)(((unsigned long)addr) & -size); 92 mb(); 93 for (; addr < end; addr += size) 94 clflush((unsigned long)addr); 95 mb(); 96 return; 97 } 98 99 cpu_wbinvd_on_all_cpus(); 100 } 101 EXPORT_SYMBOL(drm_clflush_virt_range); 102