drm/i915: Make request's wait-for-space explicit

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At the start of building a request, we would wait for roughly enough
space to fit the average request (to reduce the likelihood of having to
wait and abort partway through request construction). To achieve we
would try to begin a 0-length command packet, this just adds extra
confusion so make the wait-for-space explicit, as in the next patch we
want to move it from the backend to the i915_gem_request_alloc() so it
can ensure that the wait-for-space is the first operation in building a
new request.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115151204.8105-2-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2017-11-15 15:12:04 +00:00

parent 24fd018aae

commit fd13821219

3 changed files with 41 additions and 24 deletions

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8

drivers/gpu/drm/i915/intel_lrc.c

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56

drivers/gpu/drm/i915/intel_ringbuffer.c

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1

drivers/gpu/drm/i915/intel_ringbuffer.h

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