Re: [PATCH v2 0/2] ARM Sbsa-ref: Enable CPU cluster topology

[熊乙宁]

> W dniu 22.03.2024 o 19:51, Peter Maydell pisze:
> > On Tue, 12 Mar 2024 at 08:32, Xiong Yining
> 
> >> xiongyining1480 (2):
> >>    hw/arm/sbsa-ref:Enable CPU cluster on ARM sbsa machine
> >>    hw/arm/sbsa-ref: Add cpu-map to device tree
> > 
> > Thanks for these patches. I think we should squash the two
> > patches together into one, because the first patch is only
> > a single line, and also because we shouldn't say that the
> > machine supports cluster topology until it actually does
> > by putting the information into the device tree.

fully agree

> > There's no rush, because we're  now in softfreeze for 9.0, so these
> > will have to wait until 9.0 is released (in about a month's time).
> 
> > I'm also a bit confused by the Reviewed-by: tag from Marcin on patch 2,
> > because I can't see that in my mail archives of the discussion on version
> > 1 of this patchset, only a Tested-by.
> > Marcin, are you OK with these patches?
> 
> I only tested them. They are fine, will check on Monday.
> 
> > Also, is this change to the DTB something that would require an
> > increase in the sbsa-ref platform version number, or not?
> 
> TF-A will check for "/cpus/cpu-map" node and if it is missing then will 
> not provide it to EDK2. So far I did not saw patches for firmware side.

I send a patch in TF-A to check  "/cpus/cpu-map" node 
https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/27189/1#message-2c29be6b8b9b4fd3fef23ba7be6fe6fc3a2d0aef.
 It can be used with this patch in qemu.

> I would add bump of platform version to 0.4 one. It is cheap operation 
> and so far (from firmware side) we check for >= 0.3 only.
> 
>  > Should we adjust the documentation in docs/system/arm/sbsa.rst to
>  > mention that the DTB might have cluster topology information?
> 
> Yes. I will send an update to mention that NUMA configuration can be 
> there too (we already export it from TF-A to EDK2 via SMC calls).


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