Re: [PATCH] irqchip/gic-v3: Allow 'dma-noncoherent' property for ITS

[Marc Zyngier]

On Sun, 12 Feb 2023 09:35:05 +0000,
Ben Dai <ben.dai9703@xxxxxxxxx> wrote:
> 
> Currently the ITS driver expects the hardware to report whether it is
> shareable, but according to the description of the GITS_CBASER register
> in the GICv3 architecture specification:
>  > It is IMPLEMENTATION DEFINED whether this field has a fixed value or
>  > can be programmed by software. Implementing this field with a fixed
>  > value is deprecated.
> 
> It means that the hardware may expect the software to correctly configure
> the access attributes of the ITS. In order to support those designs where
> ITS and CPU are not in a coherent domain, allow 'dma-noncoherent' property
> for ITS.

No. This is an integration bug, most likely a Rockchip quality
design. I have repeatedly explained how to deal with this, and I'm not
going to do that again. Please search the list archives.

I will not be taking this sort of patch.

	M.

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