[Intel-gfx] [PATCH v4 10/38] drm/i915: Force MMIO flips when scheduler enabled

Chris Wilson chris at chris-wilson.co.uk
Mon Jan 11 14:16:47 PST 2016

On Mon, Jan 11, 2016 at 06:42:39PM +0000, John.C.Harrison at Intel.com wrote:
> From: John Harrison <John.C.Harrison at Intel.com>
> MMIO flips are the preferred mechanism now but more importantly,

Says who?

> pipe
> based flips cause issues for the scheduler. Specifically, submitting
> work to the rings around the side of the scheduler could cause that
> work to be lost if the scheduler generates a pre-emption event on that
> ring.

That just says that you haven't designed for the ability to schedule a
flip into the scheduler, including handling the priority bump that might
required to hit the deadline.

Chris Wilson, Intel Open Source Technology Centre

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