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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-10-28 13:58:33 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-10-28 20:53:45 +0100 |
| commit | 96d776345277d81dc96e984f13d8f2b84ab0dee4 (patch) | |
| tree | d9960f9d7ac4f25b250b30d48d88f460e8d1a5bd /drivers/gpu/drm/i915/i915_gem_stolen.c | |
| parent | 4c7d62c6b8a2b4e2300d977644e78b25a2d5f4d0 (diff) | |
| download | linux-96d776345277d81dc96e984f13d8f2b84ab0dee4.tar.bz2 | |
drm/i915: Use a radixtree for random access to the object's backing storage
A while ago we switched from a contiguous array of pages into an sglist,
for that was both more convenient for mapping to hardware and avoided
the requirement for a vmalloc array of pages on every object. However,
certain GEM API calls (like pwrite, pread as well as performing
relocations) do desire access to individual struct pages. A quick hack
was to introduce a cache of the last access such that finding the
following page was quick - this works so long as the caller desired
sequential access. Walking backwards, or multiple callers, still hits a
slow linear search for each page. One solution is to store each
successful lookup in a radix tree.
v2: Rewrite building the radixtree for clarity, hopefully.
v3: Rearrange execbuf to avoid calling i915_gem_object_get_sg() from
within an atomic section and so relax the allocation context to a simple
GFP_KERNEL and mutex.
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/20161028125858.23563-10-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_stolen.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_stolen.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index f4f6d3a48b05..70e61bc35c60 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -595,8 +595,8 @@ _i915_gem_object_create_stolen(struct drm_device *dev, if (obj->pages == NULL) goto cleanup; - obj->get_page.sg = obj->pages->sgl; - obj->get_page.last = 0; + obj->get_page.sg_pos = obj->pages->sgl; + obj->get_page.sg_idx = 0; i915_gem_object_pin_pages(obj); obj->stolen = stolen; |