drm/i915/gt: Drop mutex serialisation between context pin/unpin

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The last remaining reason for serialising the pin/unpin of the
intel_context is to ensure that our preallocated wakerefs are not
consumed too early (i.e. the unpin of the previous phase does not emit
the idle barriers for this phase before we even submit). All of the
other operations within the context pin/unpin are supposed to be
atomic...  Therefore, we can reduce the serialisation to being just on
the i915_active.preallocated_barriers itself and drop the nested
pin_mutex from intel_context_unpin().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200106114234.2529613-5-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2020-01-06 11:42:33 +00:00

parent 3fbbbef4f5

commit 8413502238

2 changed files with 26 additions and 17 deletions

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24

drivers/gpu/drm/i915/gt/intel_context.c

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19

drivers/gpu/drm/i915/i915_active.c

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