1 /* $OpenBSD: drm_cache.c,v 1.8 2020/06/08 04:47:58 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 <sys/types.h> 19 #include <sys/param.h> 20 #include <uvm/uvm_extern.h> 21 22 #include <linux/highmem.h> 23 #include <linux/scatterlist.h> 24 25 #if defined(__i386__) || defined(__amd64__) 26 static void 27 drm_clflush_page(struct vm_page *page) 28 { 29 void *addr; 30 31 if (page == NULL) 32 return; 33 34 addr = kmap_atomic(page); 35 pmap_flush_cache((vaddr_t)addr, PAGE_SIZE); 36 kunmap_atomic(addr); 37 } 38 39 void 40 drm_clflush_pages(struct vm_page *pages[], unsigned long num_pages) 41 { 42 unsigned long i; 43 44 for (i = 0; i < num_pages; i++) 45 drm_clflush_page(*pages++); 46 } 47 48 void 49 drm_clflush_sg(struct sg_table *st) 50 { 51 struct sg_page_iter sg_iter; 52 53 for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) 54 drm_clflush_page(sg_page_iter_page(&sg_iter)); 55 } 56 57 void 58 drm_clflush_virt_range(void *addr, unsigned long length) 59 { 60 pmap_flush_cache((vaddr_t)addr, length); 61 } 62 #else 63 void 64 drm_clflush_pages(struct vm_page *pages[], unsigned long num_pages) 65 { 66 STUB(); 67 } 68 #endif 69