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drm/i915: Make mmio flip wait for seqno in the work function

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This simplifies the code quite a bit compared to iterating over all
rings during the ring interrupt.

Also, it allows us to drop the mmio_flip spinlock, since the mmio_flip
struct is only accessed in two places. The first is when the flip is
queued and the other when the mmio writes are done. Since a flip cannot
be queued while there is a pending flip, the two paths shouldn't ever
run in parallel. We might need to revisit that if support for replacing
flips is implemented though.

v2: Don't hold dev->struct_mutext while waiting (Chris)

v3: Make the wait uninterruptable (Chris)

Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ander Conselvan de Oliveira
2014-11-06 11:03:40 +02:00
committed by Daniel Vetter
parent 16e9a21f33
commit 536f5b5e86
3 changed files with 14 additions and 92 deletions
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3
drivers/gpu/drm/i915/i915_irq.c
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@@ -979,9 +979,6 @@ static void notify_ring(struct drm_device *dev,
trace_i915_gem_request_complete(ring);
if (drm_core_check_feature(dev, DRIVER_MODESET))
intel_notify_mmio_flip(ring);
wake_up_all(&ring->irq_queue);
i915_queue_hangcheck(dev);
}