drm/i915: Measure the required reserved size for request emission

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Instead of tediously and fragilely counting up the number of dwords
required to emit the breadcrumb to seal a request, fake a request and
measure it automatically once during engine setup.

The downside is that this requires a fair amount of mocking to create a
proper breadcrumb. Still, should be less error prone in future as the
breadcrumb size fluctuates!

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/20190125100520.20163-1-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2019-01-25 10:05:20 +00:00

parent 8e525cb4a6

commit e1a73a54a9

5 changed files with 77 additions and 14 deletions

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49

drivers/gpu/drm/i915/intel_engine_cs.c

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12

drivers/gpu/drm/i915/intel_lrc.c

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24

drivers/gpu/drm/i915/intel_ringbuffer.c

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2

drivers/gpu/drm/i915/intel_ringbuffer.h

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4

drivers/gpu/drm/i915/selftests/mock_engine.c

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