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drm/i915: Use radixtree to jump start intel_partial_pages()

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We can use the radixtree index of the obj->pages to find the start
position of the desired partial range.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-11-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-10-28 13:58:34 +01:00
parent 96d7763452
commit d2a84a76a3
1 changed files with 26 additions and 14 deletions
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40
drivers/gpu/drm/i915/i915_gem_gtt.c
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@ -3584,35 +3584,47 @@ intel_partial_pages(const struct i915_ggtt_view *view,
struct drm_i915_gem_object *obj)
{
struct sg_table *st;
struct scatterlist *sg;
struct sg_page_iter obj_sg_iter;
struct scatterlist *sg, *iter;
unsigned int count = view->params.partial.size;
unsigned int offset;
int ret = -ENOMEM;
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
goto err_st_alloc;
ret = sg_alloc_table(st, view->params.partial.size, GFP_KERNEL);
ret = sg_alloc_table(st, count, GFP_KERNEL);
if (ret)
goto err_sg_alloc;
iter = i915_gem_object_get_sg(obj,
view->params.partial.offset,
&offset);
GEM_BUG_ON(!iter);
sg = st->sgl;
st->nents = 0;
for_each_sg_page(obj->pages->sgl, &obj_sg_iter, obj->pages->nents,
view->params.partial.offset)
{
if (st->nents >= view->params.partial.size)
break;
do {
unsigned int len;
sg_set_page(sg, NULL, PAGE_SIZE, 0);
sg_dma_address(sg) = sg_page_iter_dma_address(&obj_sg_iter);
sg_dma_len(sg) = PAGE_SIZE;
len = min(iter->length - (offset << PAGE_SHIFT),
count << PAGE_SHIFT);
sg_set_page(sg, NULL, len, 0);
sg_dma_address(sg) =
sg_dma_address(iter) + (offset << PAGE_SHIFT);
sg_dma_len(sg) = len;
sg = sg_next(sg);
st->nents++;
}
count -= len >> PAGE_SHIFT;
if (count == 0) {
sg_mark_end(sg);
return st;
}
return st;
sg = __sg_next(sg);
iter = __sg_next(iter);
offset = 0;
} while (1);
err_sg_alloc:
kfree(st);