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drm/i915: Introduce i915_gem_object_get_dma_address() 

This utility function is a companion to i915_gem_object_get_page() that
uses the same cached iterator for the scatterlist to perform fast
sequential lookup of the dma address associated with any page within the
object.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Chris Wilson 2016-06-10 14:23:00 +05:30 committed by Tvrtko Ursulin
parent d6473f5664
commit 341be1cd61
1 changed files with 17 additions and 0 deletions
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17
drivers/gpu/drm/i915/i915_drv.h
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@ -3118,6 +3118,23 @@ static inline int __sg_page_count(struct scatterlist *sg)
struct page *
i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj, int n);
static inline dma_addr_t
i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj, int n)
{
if (n < obj->get_page.last) {
obj->get_page.sg = obj->pages->sgl;
obj->get_page.last = 0;
}
while (obj->get_page.last + __sg_page_count(obj->get_page.sg) <= n) {
obj->get_page.last += __sg_page_count(obj->get_page.sg++);
if (unlikely(sg_is_chain(obj->get_page.sg)))
obj->get_page.sg = sg_chain_ptr(obj->get_page.sg);
}
return sg_dma_address(obj->get_page.sg) + ((n - obj->get_page.last) << PAGE_SHIFT);
}
static inline struct page *
i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n)
{