linux-kernel - Re: [PATCH 05/11] drivers/firmware: Expose psci_get_version through psci

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Date:   Thu, 4 Jan 2018 16:10:08 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Will Deacon <will.deacon@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, catalin.marinas@....com,
        ard.biesheuvel@...aro.org, marc.zyngier@....com,
        christoffer.dall@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/11] drivers/firmware: Expose psci_get_version through
 psci_ops structure

On Thu, Jan 04, 2018 at 03:08:29PM +0000, Will Deacon wrote:
> Entry into recent versions of ARM Trusted Firmware will invalidate the CPU
> branch predictor state in order to protect against aliasing attacks.
> 
> This patch exposes the PSCI "VERSION" function via psci_ops, so that it
> can be invoked outside of the PSCI driver where necessary.
> 
> Signed-off-by: Will Deacon <will.deacon@....com>
> ---
>  drivers/firmware/psci.c | 2 ++
>  include/linux/psci.h    | 1 +
>  2 files changed, 3 insertions(+)

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>

> diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
> index d687ca3d5049..8b25d31e8401 100644
> --- a/drivers/firmware/psci.c
> +++ b/drivers/firmware/psci.c
> @@ -496,6 +496,8 @@ static void __init psci_init_migrate(void)
>  static void __init psci_0_2_set_functions(void)
>  {
>  	pr_info("Using standard PSCI v0.2 function IDs\n");
> +	psci_ops.get_version = psci_get_version;
> +
>  	psci_function_id[PSCI_FN_CPU_SUSPEND] =
>  					PSCI_FN_NATIVE(0_2, CPU_SUSPEND);
>  	psci_ops.cpu_suspend = psci_cpu_suspend;
> diff --git a/include/linux/psci.h b/include/linux/psci.h
> index bdea1cb5e1db..6306ab10af18 100644
> --- a/include/linux/psci.h
> +++ b/include/linux/psci.h
> @@ -26,6 +26,7 @@ int psci_cpu_init_idle(unsigned int cpu);
>  int psci_cpu_suspend_enter(unsigned long index);
>  
>  struct psci_operations {
> +	u32 (*get_version)(void);
>  	int (*cpu_suspend)(u32 state, unsigned long entry_point);
>  	int (*cpu_off)(u32 state);
>  	int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
> -- 
> 2.1.4
>