Re: [RFC v1 1/1] Refactor ACPI DMA to support platforms without shared info descriptor in CSRT

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On Tue, Mar 21, 2023 at 07:53:33PM +0200, Andy Shevchenko wrote:
> On Tue, Mar 21, 2023 at 04:02:41PM +0000, Niyas Sait wrote:
> > This patch refactors the ACPI DMA layer to support platforms without
> > shared info descriptor in CSRT.
> > 
> > Shared info descriptor is optional and vendor specific (not
> > standardized) and not used by Arm platforms.

Btw, what is the real argument of not using this table?

Yes, I know that this is an MS extension, but why ARM needs something else and
why even that is needed at all? CSRT is only for the _shared_ DMA resources
and I think most of the IPs nowadays are using private DMA engines (or
semi-private when driver based on ID can know which channel services which
device).


-- 
With Best Regards,
Andy Shevchenko





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