Re: [PATCH 2/3] arm64: export acpi_psci_use_hvc

From: Sudeep Holla <sudeep.holla@arm.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Matt Mackall <mpm@selenic.com>, Will Deacon <will.deacon@arm.com>,
	linux-kernel@vger.kernel.org,
	Ron Rindjunsky <ronrindj@amazon.com>,
	Ali Saidi <alisaidi@amazon.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	David Woodhouse <dwmw@amazon.co.uk>,
	linux-arm-kernel@lists.infradead.org,
	linux-crypto@vger.kernel.org
Subject: Re: [PATCH 2/3] arm64: export acpi_psci_use_hvc
Date: Wed, 5 Jun 2019 12:02:32 +0100	[thread overview]
Message-ID: <20190605110232.GB20813@e107155-lin> (raw)
In-Reply-To: <20190605103840.GA30925@lakrids.cambridge.arm.com>

On Wed, Jun 05, 2019 at 11:38:40AM +0100, Mark Rutland wrote:
> On Wed, Jun 05, 2019 at 10:40:31AM +0100, Sudeep Holla wrote:
> > On Tue, Jun 04, 2019 at 08:30:59PM +0000, Ali Saidi wrote:
> > > Allow a module that wants to make SMC calls to detect if it should be
> > > using smc or hvc.
> > >
> > > Signed-off-by: Ali Saidi <alisaidi@amazon.com>
> > > ---
> > >  arch/arm64/kernel/acpi.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
> > > index 803f0494dd3e..ea41c6541d3c 100644
> > > --- a/arch/arm64/kernel/acpi.c
> > > +++ b/arch/arm64/kernel/acpi.c
> > > @@ -119,6 +119,7 @@ bool acpi_psci_use_hvc(void)
> > >  {
> > >  	return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
> > >  }
> > > +EXPORT_SYMBOL_GPL(acpi_psci_use_hvc);
> > >
> > 
> > I would rather have this in drivers/firmware/psci/psci.c checking the
> > value of psci_ops.conduit so that it's not just ACPI specific and can
> > be used on DT platforms too if required.
> 
> I'd also like this to not hook into PSCI internals. This code cares
> about SMCCC, not PSCI. We also really shouldn't need to spread the
> conduit management everywhere, too.

I agree. I remember suggesting the same to Xilinx a while ago but I
didn't see your patches in the mainline.

--
Regards,
Sudeep

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