drm/i915/gem: Avoid kmalloc under i915->mm_lock

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Rearrange the allocation of the mm_struct registration to avoid
allocating underneath the i915->mm_lock, so that we avoid tainting the
lock (and in turn many other locks that may be held as i915->mm_lock is
taken, and those locks we may want on the free [shrinker] paths). In
doing so, we convert the lookup to be RCU protected by courtesy of
converting the free-worker to be an rcu_work.

v2: Remember to use hash_rcu variants to protect the list iteration from
concurrent add/del.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200619194038.5088-1-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2020-06-19 20:40:38 +01:00

parent f6a7d3952c

commit 040e123c0b

2 changed files with 65 additions and 68 deletions

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131

drivers/gpu/drm/i915/gem/i915_gem_userptr.c

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2

drivers/gpu/drm/i915/i915_drv.h

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