Quoting Chris Wilson (2018-05-08 13:52:30)
> We assume that the CSB is written using the normal ringbuffer
> coherency protocols, as outlined in kernel/events/ring_buffer.c:
>
> * (HW) (DRIVER)
> *
> * if (LOAD ->data_tail) { LOAD ->data_head
> * (A) smp_rmb() (C)
> * STORE $data LOAD $data
> * smp_wmb() (B) smp_mb() (D)
> * STORE ->data_head STORE ->data_tail
> * }
>
> So we assume that the HW fulfils it's ordering requirements (B), and so
> we should use a complimentary rmb (C) to ensure that our read of its
> WRITE pointer is completed before we start accessing the data.
>
> The final mb (D) is implied by the uncached mmio we perform to inform
> the HW of our READ pointer.
>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=105064
> References: https://bugs.freedesktop.org/show_bug.cgi?id=105888
> References: https://bugs.freedesktop.org/show_bug.cgi?id=106185
> References: 61bf9719fa17 ("drm/i915/cnl: Use mmio access to context status buffer")
> Suggested-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Cc: Michał Winiarski <michal.winiarski@xxxxxxxxx>
> Cc: Rafael Antognolli <rafael.antognolli@xxxxxxxxx>
> Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
> Cc: Timo Aaltonen <tjaalton@xxxxxxxxxx>
> Tested-by: Timo Aaltonen <tjaalton@xxxxxxxxxx>
> ---
>
> Just tweaked the commitmsg to cross reference the mb against the
> diagram.
And still forgot to fix s/it's/its/
-Chris
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