/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2016 Intel Corporation
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*/
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#include "i915_scatterlist.h"
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bool i915_sg_trim(struct sg_table *orig_st)
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{
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struct sg_table new_st;
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struct scatterlist *sg, *new_sg;
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unsigned int i;
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if (orig_st->nents == orig_st->orig_nents)
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return false;
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if (sg_alloc_table(&new_st, orig_st->nents, GFP_KERNEL | __GFP_NOWARN))
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return false;
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new_sg = new_st.sgl;
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for_each_sg(orig_st->sgl, sg, orig_st->nents, i) {
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sg_set_page(new_sg, sg_page(sg), sg->length, 0);
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sg_dma_address(new_sg) = sg_dma_address(sg);
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sg_dma_len(new_sg) = sg_dma_len(sg);
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new_sg = sg_next(new_sg);
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}
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GEM_BUG_ON(new_sg); /* Should walk exactly nents and hit the end */
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sg_free_table(orig_st);
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*orig_st = new_st;
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return true;
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}
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#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
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#include "selftests/scatterlist.c"
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#endif
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