[Intel-gfx] [PATCH 04/17] drm/i915: Wrap around the tail offset before setting ring->tail

[Joonas Lahtinen]

Quoting Chris Wilson (2018-06-10 22:43:12)
> The HW only accepts offsets within ring->size, and fails peculiarly if
> the RING_HEAD or RING_TAIL is set to ring->size. Therefore whenever we
> set ring->head/ring->tail we want to make sure it is within value (using
> intel_ring_wrap()).
> 
> v2: Double check execlists as well
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> Cc: Matthew Auld <matthew.william.auld at gmail.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Regards, Joonas