drm/i915: Wait for pending flips on the GPU

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Currently, if a batch buffer refers to an object with a pending flip,
then we sleep until that pending flip is completed (unpinned and
signalled). This is so that a flip can be queued and the user can
continue rendering to the backbuffer oblivious to whether the buffer is
still pinned as the scan out. (The kernel arbitrating at the last moment
to stall the batch and wait until the buffer is unpinned and replaced as
the front buffer.)

As we only have a queue depth of 1, we can simply wait for the current
pending flip to complete and continue rendering. We can achieve this
with a single WAIT_FOR_EVENT command inserted into the ring buffer prior
to executing the batch, *without* stalling the client.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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This commit is contained in:

Chris Wilson 2010-10-07 17:28:15 +01:00

parent c2873e9633

commit e59f2bac15

2 changed files with 34 additions and 48 deletions

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75

drivers/gpu/drm/i915/i915_gem.c

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7

drivers/gpu/drm/i915/intel_display.c

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