drm/i915: Add soft-pinning API for execbuffer
Userspace can pass in an offset that it presumes the object is located at. The kernel will then do its utmost to fit the object into that location. The assumption is that userspace is handling its own object locations (for example along with full-ppgtt) and that the kernel will rarely have to make space for the user's requests. v2: Fix i915_gem_evict_range() (now evict_for_vma) to handle ordinary and fixed objects within the same batch Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: "Daniel, Thomas" <thomas.daniel@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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