linux-kernel - Re: [PATCH v3] [RFC] arm: use PSCI if available

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Message-Id: <201303271803.45420.arnd@arndb.de>
Date:	Wed, 27 Mar 2013 18:03:45 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Rob Herring <robherring2@...il.com>
Cc:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Will Deacon <will.deacon@....com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"nico@...aro.org" <nico@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] [RFC] arm: use PSCI if available

On Wednesday 27 March 2013, Rob Herring wrote:
> No, I was thinking in the case of Xen and mach-virt, you would not set
> mdesc->smp. So you would have something like this:
> 
> if (mdesc->smp)
>         smp_set_ops(mdesc->smp);
> else
>         smp_set_ops(&psci_smp_ops);

The case that Stefano is interested in if obviously other platforms
that can either run as Dom0 under Xen with psci_smp_ops or natively
with their own smp_ops. A similar case would be a platform that
may implement psci using smc when run in secure mode but provide
its own smp_ops when run natively.

In both cases, it would be simpler to use psci if available but
fall back to mdesc->smp otherwise.

	Arnd
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