[Bug 110934] [CI][DRMTIP]igt at gem_vm_create@isolation - incomplete/dmesg-warn - WARN_ON(debug_locks && !lock_is_held(&(&vma->vm->i915->drm.struct_mutex)->dep_map))

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110934

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit b32fa811156328aea5a3c2ff05cc096490382456 (HEAD -> drm-intel-next-queued,
drm-intel/for-linux-next, drm-intel/drm-intel-next-queued)
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Jun 20 19:37:05 2019 +0100

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

    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 at chris-wilson.co.uk>
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20190620183705.31006-1-chris@chris-wilson.co.uk

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