[Skiboot] Skiboot recovery of MCEs during MMIO read of SCOMs: 55672ecfa21f

Patrick Williams patrick at stwcx.xyz
Tue Sep 22 06:01:19 AEST 2015

On Mon, Sep 21, 2015 at 01:02:48PM +1000, Daniel Axtens wrote:
> Hi,
> This relates to 55672ecfa21f ("powerpc/book3s: Recover from MC in
> sapphire on SCOM read via MMIO.").
> According to that patch, some SCOM reads via MMIO could lead to a
> Machine Check Error in skiboot. That patch provided kernel support for a
> skiboot interface to recover from those MCEs.
> That patch went into the kernel in Dec 2013. However, modern skiboot
> does not expose the device tree property needed to use this mechanism.
> As far as I can tell, nothing ever went into Skiboot for this purpose. 
> Is this something we plan to use in the future? Or is it now redundant?
> -- 
> Regards,
> Daniel
> _______________________________________________
> Skiboot mailing list
> Skiboot at lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/skiboot

XSCOM does not cause a machine check.  Centaur Inband SCOM does cause a
machine check.  Was this maybe put in place in anticipation of
supporting Inband SCOM?  Does skiboot support Inband SCOM now?

Patrick Williams
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