drm_cache.c revision 1.5 
1/*	$OpenBSD: drm_cache.c,v 1.5 2018/04/20 16:09:36 deraadt 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 <dev/pci/drm/drmP.h>
19
20static void
21drm_clflush_page(struct vm_page *page)
22{
23	void *addr;
24
25	if (page == NULL)
26		return;
27
28	addr = kmap_atomic(page);
29	pmap_flush_cache((vaddr_t)addr, PAGE_SIZE);
30	kunmap_atomic(addr);
31}
32
33void
34drm_clflush_pages(struct vm_page *pages[], unsigned long num_pages)
35{
36	unsigned long i;
37
38	for (i = 0; i < num_pages; i++)
39		drm_clflush_page(*pages++);
40}
41
42void
43drm_clflush_sg(struct sg_table *st)
44{
45	struct sg_page_iter sg_iter;
46
47	for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
48		drm_clflush_page(sg_page_iter_page(&sg_iter));
49}
50
51void
52drm_clflush_virt_range(void *addr, unsigned long length)
53{
54	pmap_flush_cache((vaddr_t)addr, length);
55}
56