40 строки
846 B
C
40 строки
846 B
C
|
/*
|
||
|
|
* 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
|