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drm/i915: mark a newly-created GEM object dirty when filled with data 

When creating a new (pageable) GEM object and filling it with data, we
must mark it as 'dirty', i.e. backing store is out-of-date w.r.t. the
newly-written content. This ensures that if the object is evicted under
memory pressure, its pages in the pagecache will be written to backing
store rather than discarded.

Based on an original version by Alex Dai.

Signed-off-by: Alex Dai <yu.dai@intel.com>
Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1449773486-30822-3-git-send-email-david.s.gordon@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Dave Gordon 2015-12-10 18:51:24 +00:00 committed by Daniel Vetter
parent 033908aed5
commit 9e7d18c08a
1 changed files with 1 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_gem.c
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@ -5225,6 +5225,7 @@ i915_gem_object_create_from_data(struct drm_device *dev,
i915_gem_object_pin_pages(obj);
sg = obj->pages;
bytes = sg_copy_from_buffer(sg->sgl, sg->nents, (void *)data, size);
obj->dirty = 1; /* Backing store is now out of date */
i915_gem_object_unpin_pages(obj);
if (WARN_ON(bytes != size)) {