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

On Friday, 10 August 2018 5:07:56 PM AEST Michael Ellerman wrote:

Reza Arbab [off-list ref] writes:

quoted

From: Alistair Popple <redacted>

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