[Intel-gfx] [PATCH 06/17] drm/i915/ringbuffer: Serialize load of PD_DIR

[Joonas Lahtinen]

Quoting Chris Wilson (2018-06-10 22:43:14)
> After triggering the mm switch with a load of PD_DIR, which may be
> deferred unto the MI_SET_CONTEXT on rcs, serialise the next commands
> with that load by posting a read of PD_DIR (or else those subsequent
> commands may access the stale page tables).
> 
> 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>

Again, commit message checks out with code. Do you have your own
bug-triaging flowchart that you come up with these W/As? :)

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

Regards, Joonas