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

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Date:   Tue, 15 Oct 2019 18:24:53 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Jianyong Wu <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@....com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
        Steve.Capper@....com, Kaly.Xin@....com, justin.he@....com,
        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.

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
>