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Chris Wilson authored
It is required that the caller declare the exact number of dwords they wish to write into the ring. This is required for two reasons, we need to allocate sufficient space for the entire command packet and we need to be sure that the contents are completely written to avoid executing stale data. The current interface requires for any bug to be caught in review, the reader has to carefully count the number of intel_ring_emit() between intel_ring_begin() and intel_ring_advance(). If we record the end of the packet of each intel_ring_begin() we can also have CI check for us. Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by:
Mika Kuoppala <mika.kuoppala@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170206170502.30944-1-chris@chris-wilson.co.uk
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