linux-kernel - Re: [PATCH 2/3] arm64: export acpi_psci_use

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Date:   Wed, 5 Jun 2019 12:02:32 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Ali Saidi <alisaidi@...zon.com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Matt Mackall <mpm@...enic.com>,
        Will Deacon <will.deacon@....com>,
        Ron Rindjunsky <ronrindj@...zon.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Sudeep Holla <sudeep.holla@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 2/3] arm64: export acpi_psci_use_hvc

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@...zon.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