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9c870d0367
We can remove the false coupling between RPM and struct mutex by the observation that we can use the RPM wakeref as the barrier around user mmap access. That is as we tear down the user's PTE atomically from within rpm suspend and then to fault in new PTE requires the rpm wakeref, means that no user access is possible through those PTE without RPM being awake. Having made that observation, we can then remove the presumption of having to take rpm outside of struct_mutex and so allow fine grained acquisition of a wakeref around hw access rather than having to remember to acquire the wakeref early on. v2: Rejig placement of the new intel_runtime_pm_get() to be as tight as possible around the GTT pread/pwrite. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Imre Deak <imre.deak@intel.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Daniel Vetter <daniel@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161024124218.18252-2-chris@chris-wilson.co.uk |
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