[RFC PATCH 0/7] arm64: mm: Prototype to allow drivers to request PBHA values

[Marc Zyngier]

Hi James,

On Fri, 15 Oct 2021 17:14:09 +0100,
James Morse <james.morse at arm.com> wrote:
> 
> Hello!
> 
> Do you have hardware that uses PBHA? If so, what does the SoC do in
> response to which bits, and what workload needs that behaviour?
> 
> This series is a start at trying to work out what linux needs to
> support to makeuse of existing SoCs using PBHA.

Thanks for starting this.

I think one part that is missing here is the device side of things.
How do these attributes get used by the SMMU, how do we convey them to
the DMA layer, and what is the expected behaviour when we have SVA?
Not having any guidance form the architecture means that we're walking
on very thin ice...

	M.

-- 
Without deviation from the norm, progress is not possible.