drm/i915/gtt: Defer address space cleanup to an RCU worker

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Enable RCU protection of i915_address_space and its ppgtt superclasses,
and defer its cleanup into a worker executed after an RCU grace period.

In the future we will be able to use the RCU protection to reduce the
locking around VM lookups, but the immediate benefit is being able to
defer the release into a kworker (process context). This is required as
we may need to sleep to reap the WC pages stashed away inside the ppgtt.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110934
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190620183705.31006-1-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2019-06-20 19:37:05 +01:00

parent 683d672c42

commit b32fa81115

4 changed files with 71 additions and 113 deletions

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1

drivers/gpu/drm/i915/Makefile.header-test

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174

drivers/gpu/drm/i915/i915_gem_gtt.c

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7

drivers/gpu/drm/i915/i915_gem_gtt.h

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2

drivers/gpu/drm/i915/selftests/i915_gem_gtt.c

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