drm/i915/execlists: Drop preemption arbitrations points along the ring
Limit the arbitration (where preemption may occur) to inside the batch, and prevent it from happening on the pipecontrols/flushes we use to write the breadcrumb seqno. Once the user batch is complete, we have nothing left to do but serialise and emit the breadcrumb; switching contexts at this point is futile so don't. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Michał Winiarski <michal.winiarski@intel.com> Cc: Michel Thierry <michel.thierry@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Michel Thierry <michel.thierry@intel.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180503195416.22498-1-chris@chris-wilson.co.uk
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