tree 02689b01aa2d069ec59cbc7b1f95af61a1003d31
parent 37e680a15ff6375ff02773161f817e90a38c51f7
author Chris Wilson <chris@chris-wilson.co.uk> 1346788974 +0100
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1348143776 +0200

drm/i915: Pin backing pages whilst exporting through a dmabuf vmap

We need to refcount our pages in order to prevent reaping them at
inopportune times, such as when they currently vmapped or exported to
another driver. However, we also wish to keep the lazy deallocation of
our pages so we need to take a pin/unpinned approach rather than a
simple refcount.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>