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drm/i915: Skip clflushes for all non-page backed objects 

Generalise the skip for physical and stolen objects by skipping anything
we do not have a valid address for inside the sg.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170222114049.28456-4-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-02-22 11:40:47 +00:00
parent 5a97bcc69c
commit f6aaba4dfb
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/i915/i915_gem.c
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@ -3140,14 +3140,19 @@ void i915_gem_clflush_object(struct drm_i915_gem_object *obj,
* to GPU, and we can ignore the cache flush because it'll happen
* again at bind time.
*/
if (!obj->mm.pages)
if (!obj->mm.pages) {
GEM_BUG_ON(obj->base.write_domain != I915_GEM_DOMAIN_CPU);
return;
}
/*
* Stolen memory is always coherent with the GPU as it is explicitly
* marked as wc by the system, or the system is cache-coherent.
* Similarly, we only access struct pages through the CPU cache, so
* anything not backed by physical memory we consider to be always
* coherent and not need clflushing.
*/
if (obj->stolen || obj->phys_handle)
if (!i915_gem_object_has_struct_page(obj))
return;
/* If the GPU is snooping the contents of the CPU cache,