drm/i915: Reduce locking around i915_active_acquire_preallocate_barrier()

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As the conversion between idle-barrier and full i915_active_fence is
already serialised by explicit memory barriers, we can reduce the
spinlock in i915_active_acquire_preallocate_barrier() for finding an
idle-barrier to reuse to an RCU read lock to ensure the fence remains
valid, only taking the spinlock for the update of the rbtree itself.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Thomas Hellström <thomas.hellstrom@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200731085015.32368-6-chris@chris-wilson.co.uk
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

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Chris Wilson 2020-07-31 09:50:14 +01:00 • committed by Joonas Lahtinen

parent e28860ae21

commit 9ff33bbcda

1 changed files with 5 additions and 5 deletions

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drivers/gpu/drm/i915/i915_active.c

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