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