linux-kernel - RE: [PATCH v5 1/6] psci: Export psci_ops.conduit symbol as modules will use it.

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Date:   Wed, 16 Oct 2019 03:54:11 +0000
From:   "Jianyong Wu (Arm Technology China)" <Jianyong.Wu@....com>
To:     Mark Rutland <Mark.Rutland@....com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "yangbo.lu@....com" <yangbo.lu@....com>,
        "john.stultz@...aro.org" <john.stultz@...aro.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
        "maz@...nel.org" <maz@...nel.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "will@...nel.org" <will@...nel.org>,
        Suzuki Poulose <Suzuki.Poulose@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Steve Capper <Steve.Capper@....com>,
        "Kaly Xin (Arm Technology China)" <Kaly.Xin@....com>,
        "Justin He (Arm Technology China)" <Justin.He@....com>,
        nd <nd@....com>
Subject: RE: [PATCH v5 1/6] psci: Export psci_ops.conduit symbol as modules
 will use it.

Hi Mark,

> -----Original Message-----
> From: Mark Rutland <mark.rutland@....com>
> Sent: Wednesday, October 16, 2019 1:25 AM
> To: Jianyong Wu (Arm Technology China) <Jianyong.Wu@....com>
> Cc: netdev@...r.kernel.org; yangbo.lu@....com; john.stultz@...aro.org;
> tglx@...utronix.de; pbonzini@...hat.com; sean.j.christopherson@...el.com;
> maz@...nel.org; richardcochran@...il.com; will@...nel.org; Suzuki
> Poulose <Suzuki.Poulose@....com>; linux-kernel@...r.kernel.org; linux-
> arm-kernel@...ts.infradead.org; kvmarm@...ts.cs.columbia.edu;
> kvm@...r.kernel.org; Steve Capper <Steve.Capper@....com>; Kaly Xin
> (Arm Technology China) <Kaly.Xin@....com>; Justin He (Arm Technology
> China) <Justin.He@....com>; nd <nd@....com>
> Subject: Re: [PATCH v5 1/6] psci: Export psci_ops.conduit symbol as modules
> will use it.
> 
> On Tue, Oct 15, 2019 at 06:48:17PM +0800, Jianyong Wu wrote:
> > If arm_smccc_1_1_invoke used in modules, psci_ops.conduit should be
> > export.
> >
> > Signed-off-by: Jianyong Wu <jianyong.wu@....com>
> 
> I have a patch queued [1] in the arm64 tree which adds
> arm_smccc_1_1_get_conduit() for this purpose.
> 
> Please use that, adding an EXPORT_SYMBOL() if necessary.
> 

Great, I will apply it next version.

Thanks
Jianyong Wu

> Thanks,
> Mark.
> 
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/commit/?h=
> for-next/smccc-conduit-
> cleanup&id=6b7fe77c334ae59fed9500140e08f4f896b36871
> 
> > ---
> >  drivers/firmware/psci/psci.c | 6 ++++++
> >  include/linux/arm-smccc.h    | 2 +-
> >  include/linux/psci.h         | 1 +
> >  3 files changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/firmware/psci/psci.c
> > b/drivers/firmware/psci/psci.c index f82ccd39a913..35c4eaab1451 100644
> > --- a/drivers/firmware/psci/psci.c
> > +++ b/drivers/firmware/psci/psci.c
> > @@ -212,6 +212,12 @@ static unsigned long
> psci_migrate_info_up_cpu(void)
> >  			      0, 0, 0);
> >  }
> >
> > +enum psci_conduit psci_get_conduit(void) {
> > +	return psci_ops.conduit;
> > +}
> > +EXPORT_SYMBOL(psci_get_conduit);
> > +
> >  static void set_conduit(enum psci_conduit conduit)  {
> >  	switch (conduit) {
> > diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
> > index 552cbd49abe8..a6e4d3e3d10a 100644
> > --- a/include/linux/arm-smccc.h
> > +++ b/include/linux/arm-smccc.h
> > @@ -357,7 +357,7 @@ asmlinkage void __arm_smccc_hvc(unsigned long
> a0, unsigned long a1,
> >   * The return value also provides the conduit that was used.
> >   */
> >  #define arm_smccc_1_1_invoke(...) ({
> 	\
> > -		int method = psci_ops.conduit;				\
> > +		int method = psci_get_conduit();			\
> >  		switch (method) {					\
> >  		case PSCI_CONDUIT_HVC:
> 	\
> >  			arm_smccc_1_1_hvc(__VA_ARGS__);
> 	\
> > diff --git a/include/linux/psci.h b/include/linux/psci.h index
> > a8a15613c157..e5cedc986049 100644
> > --- a/include/linux/psci.h
> > +++ b/include/linux/psci.h
> > @@ -42,6 +42,7 @@ struct psci_operations {
> >  	enum smccc_version smccc_version;
> >  };
> >
> > +extern enum psci_conduit psci_get_conduit(void);
> >  extern struct psci_operations psci_ops;
> >
> >  #if defined(CONFIG_ARM_PSCI_FW)
> > --
> > 2.17.1
> >