[PATCH] powerpc/powernv: Add support for NPU2 relaxed-ordering mode

Alistair Popple alistair at popple.id.au
Fri Aug 10 18:07:36 AEST 2018


On Friday, 10 August 2018 5:07:56 PM AEST Michael Ellerman wrote:
> Reza Arbab <arbab at linux.ibm.com> writes:
> > From: Alistair Popple <alistair at popple.id.au>
> >
> > Some device drivers support out of order access to GPU memory. This does
> > not affect the CPU view of memory but it does affect the GPU view, so it
> > should only be enabled once the GPU driver has requested it. Add APIs
> > allowing a driver to do so.
> 
> Do we have any indication which drivers we are expecting to use this?

I believe there is an internal driver that required these but I'm not sure if
there were any plans to make these available upstream or not.

> I'd prefer not to merge a new API unless we at least have some idea
> what's going to use it.

Fair enough. Unfortunately I am not aware of users future plans for usage of
this API.

- Alistair

> cheers
> 




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