From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Will Deacon <will.deacon@arm.com>,
Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
Ian Campbell <Ian.Campbell@citrix.com>,
Marc Zyngier <Marc.Zyngier@arm.com>,
"linux@arm.linux.org.uk" <linux@arm.linux.org.uk>,
"nico@linaro.org" <nico@linaro.org>
Subject: Re: [PATCH v2 6/6] [RFC] arm: use PSCI if available
Date: Tue, 26 Mar 2013 15:55:55 +0000 [thread overview]
Message-ID: <alpine.DEB.2.02.1303261553120.4430@kaball.uk.xensource.com> (raw)
In-Reply-To: <201303261546.50194.arnd@arndb.de>
On Tue, 26 Mar 2013, Arnd Bergmann wrote:
> On Tuesday 26 March 2013, Will Deacon wrote:
> > > They can even base the implementation of their smp_ops on the current
> > > psci code, in order to facilitate that I could get rid of psci_ops
> > > (which initialization is based on device tree) and export the psci_cpu_*
> > > functions instead, so that they can be called directly by other smp_ops.
> >
> > Again, I think this destroys the layering. The whole point is that the PSCI
> > functions are called from within something that understands precisely how to
> > talk to the firmware and what it is capable of.
>
> Right, we probably the psci smp ops to be separate from the rest of the psci
> code, but I also think that Stefano is right that we should let any platform
> use the psci smp ops if possible, rather than having to implement their own.
[...]
> The part that I'm most interested in is making it possible for a platform
> to kill off its native smp ops in the kernel by implementing the psci
> ops. I think it's a good strategy to use psci by default if both
> platform and psci implementations are available.
I fully agree, and Xen would use it as is.
If the psci node on DT only signifies the presence of psci, not that it
should be used for smp_ops, then we need another DT node or property to
say "this machine uses smp_psci_ops".
next prev parent reply other threads:[~2013-03-26 15:56 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-26 14:40 [PATCH v2 0/6] xen/arm: move to mach-virt and support SMP Stefano Stabellini
2013-03-26 14:41 ` [PATCH v2 1/6] xen/arm: actually pass a non-NULL percpu pointer to request_percpu_irq Stefano Stabellini
2013-03-26 14:41 ` [PATCH v2 2/6] xen/arm: SMP support Stefano Stabellini
2013-03-26 14:41 ` [PATCH v2 3/6] xen: move the xenvm machine to mach-virt Stefano Stabellini
2013-03-26 14:41 ` [PATCH v2 4/6] xen/arm: implement HYPERVISOR_vcpu_op Stefano Stabellini
2013-03-26 14:41 ` [PATCH v2 5/6] xenvm: add a simple PSCI node and a second cpu Stefano Stabellini
2013-03-26 15:00 ` Arnd Bergmann
2013-03-26 16:39 ` Stefano Stabellini
2013-03-26 14:41 ` [PATCH v2 6/6] [RFC] arm: use PSCI if available Stefano Stabellini
2013-03-26 14:58 ` Arnd Bergmann
2013-03-26 15:09 ` Stefano Stabellini
2013-03-26 15:04 ` Will Deacon
2013-03-26 15:25 ` Stefano Stabellini
2013-03-26 15:37 ` Will Deacon
2013-03-26 15:46 ` Arnd Bergmann
2013-03-26 15:55 ` Stefano Stabellini [this message]
2013-03-26 16:03 ` Nicolas Pitre
2013-03-27 11:15 ` Stefano Stabellini
2013-03-26 15:49 ` Stefano Stabellini
2013-03-26 16:01 ` Nicolas Pitre
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