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