drm/i915: Implement end_cpu_access
authorTiago Vignatti <tiago.vignatti@intel.com>
Tue, 22 Dec 2015 21:36:47 +0000 (19:36 -0200)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Tue, 9 Feb 2016 10:21:03 +0000 (11:21 +0100)
commit346400c801079114e89451b3191eaa4407507841
tree06adde855cabfbd44b752b235e7e460fd854f896
parent831e9da7dc5c22fd2a5fb64e999f6e077a4338c3
drm/i915: Implement end_cpu_access

This function is meant to be used with dma-buf mmap, when finishing the CPU
access of the mapped pointer.

The error case should be rare to happen though, requiring the buffer become
active during the sync period and for the end_cpu_access to be interrupted. So
we use a uninterruptible mutex_lock to spit out when it ever happens.

v2: disable interruption to make sure errors are reported.
v3: update to the new end_cpu_access API.
v7: use .write = false cause it doesn't need to know whether it's write.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1450820214-12509-5-git-send-email-tiago.vignatti@intel.com
drivers/gpu/drm/i915/i915_gem_dmabuf.c