1/*	$NetBSD: i915_scatterlist.c,v 1.3 2021/12/19 11:37:05 riastradh Exp $	*/
2
3/*
4 * SPDX-License-Identifier: MIT
5 *
6 * Copyright �� 2016 Intel Corporation
7 */
8
9#include <sys/cdefs.h>
10__KERNEL_RCSID(0, "$NetBSD: i915_scatterlist.c,v 1.3 2021/12/19 11:37:05 riastradh Exp $");
11
12#include "i915_scatterlist.h"
13
14bool i915_sg_trim(struct sg_table *orig_st)
15{
16#ifndef __NetBSD__
17	struct sg_table new_st;
18	struct scatterlist *sg, *new_sg;
19	unsigned int i;
20
21	if (orig_st->nents == orig_st->orig_nents)
22		return false;
23
24	if (sg_alloc_table(&new_st, orig_st->nents, GFP_KERNEL | __GFP_NOWARN))
25		return false;
26
27	new_sg = new_st.sgl;
28	for_each_sg(orig_st->sgl, sg, orig_st->nents, i) {
29		sg_set_page(new_sg, sg_page(sg), sg->length, 0);
30		sg_dma_address(new_sg) = sg_dma_address(sg);
31		sg_dma_len(new_sg) = sg_dma_len(sg);
32
33		new_sg = sg_next(new_sg);
34	}
35	GEM_BUG_ON(new_sg); /* Should walk exactly nents and hit the end */
36
37	sg_free_table(orig_st);
38
39	*orig_st = new_st;
40#endif
41	return true;
42}
43
44#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
45#include "selftests/scatterlist.c"
46#endif
47