[PATCH 4/5] powerpc/powernv: Pick up correct number of PEs
Benjamin Herrenschmidt
benh at kernel.crashing.org
Thu Aug 1 14:42:07 EST 2013
On Thu, 2013-08-01 at 12:24 +0800, Gavin Shan wrote:
> at correct ? Don't we get the total number of PEs from a config
> >register on the bridge ? I didn't think the IODA architecture specified
> >the total number of PE of a given implementation...
> >
>
> For now, the firmware has fixed values (1/128/256), which isn't figured
> out from EEH capability register. That might be something to do later
> for the f/w.
Sure but we can fix the firmware easily, we need per-chip code in there
anyway, while in Linux, we mostly avoid exposing the specifics of a
given implementation of the architecture, we only expose the
architectural version (IODA1 vs IODA2).
> >For example, does Torrent implement 128 ?
>
>
> I don't know what's "Torrent" :-)
It's one of our IO chips for P7 :-) It has a built-in HFI (sort-of
infiniband thingy) and implements PCIe slots with IODA1. It has *some*
differences to P7IOC however.
> >I'd rather stick to safe here, if the firmware doesn't say, just use
> >one.
> >
> >Now some of the PHB registers are actually architected in IODA afaik, so
> >we could just go look but let's not make a precedent here.
> >
>
> Ok. Thanks, Ben. Please drop this one :-)
Will do :-)
Cheers,
Ben.
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