1 /* $OpenBSD: drm_cache.c,v 1.7 2019/04/14 10:14:51 jsg Exp $ */ 2 /* 3 * Copyright (c) 2017 Mark Kettenis 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <drm/drmP.h> 19 20 #if defined(__i386__) || defined(__amd64__) 21 static void 22 drm_clflush_page(struct vm_page *page) 23 { 24 void *addr; 25 26 if (page == NULL) 27 return; 28 29 addr = kmap_atomic(page); 30 pmap_flush_cache((vaddr_t)addr, PAGE_SIZE); 31 kunmap_atomic(addr); 32 } 33 34 void 35 drm_clflush_pages(struct vm_page *pages[], unsigned long num_pages) 36 { 37 unsigned long i; 38 39 for (i = 0; i < num_pages; i++) 40 drm_clflush_page(*pages++); 41 } 42 43 void 44 drm_clflush_sg(struct sg_table *st) 45 { 46 struct sg_page_iter sg_iter; 47 48 for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) 49 drm_clflush_page(sg_page_iter_page(&sg_iter)); 50 } 51 52 void 53 drm_clflush_virt_range(void *addr, unsigned long length) 54 { 55 pmap_flush_cache((vaddr_t)addr, length); 56 } 57 #else 58 void 59 drm_clflush_pages(struct vm_page *pages[], unsigned long num_pages) 60 { 61 STUB(); 62 } 63 #endif 64