[PATCH] arm64: kexec: Add machine_kexec_mask_interrupts to kexec path

[AKASHI Takahiro]

On Wed, Apr 18, 2018 at 08:19:36PM -0600, Sameer Goel wrote:
> In kdump code path SPIs at GIC level are explicitly cleared by
> calling machine_kexec_mask_interrupts. In case of kexec this
> functionality is delegated for most part to the device shutdown
> functions.
> Add machine_kexec_mask_interrupts to machine_shutdown path to
> ensure that the irqs are masked at the gic level.

I'm not sure that this change has visible effect, but anyway

> Signed-off-by: Sameer Goel <sgoel at codeaurora.org>
> ---
> Porting code for masking irqs at gic from kdump shutdown to kexec path.
> 
> There was discussion about this functionality in [1].
> 
> [1] https://patchwork.kernel.org/patch/9817499/
> 
>  arch/arm64/include/asm/kexec.h    | 6 ++++++
>  arch/arm64/kernel/machine_kexec.c | 2 +-
>  arch/arm64/kernel/process.c       | 2 ++
>  3 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h
> index e17f052..f9ddb41 100644
> --- a/arch/arm64/include/asm/kexec.h
> +++ b/arch/arm64/include/asm/kexec.h
> @@ -93,6 +93,12 @@ static inline void crash_prepare_suspend(void) {}
>  static inline void crash_post_resume(void) {}
>  #endif
>  
> +#if defined(CONFIG_KEXEC)

CONFIG_KEXEC_CORE would be better.

Thanks,
-Takahiro AKASHI

> +extern void machine_kexec_mask_interrupts(void);
> +#else
> +static inline void machine_kexec_mask_interrupts(void) {}
> +#endif
> +
>  #endif /* __ASSEMBLY__ */
>  
>  #endif
> diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
> index f76ea92..b453180 100644
> --- a/arch/arm64/kernel/machine_kexec.c
> +++ b/arch/arm64/kernel/machine_kexec.c
> @@ -213,7 +213,7 @@ void machine_kexec(struct kimage *kimage)
>  	BUG(); /* Should never get here. */
>  }
>  
> -static void machine_kexec_mask_interrupts(void)
> +void machine_kexec_mask_interrupts(void)
>  {
>  	unsigned int i;
>  	struct irq_desc *desc;
> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
> index f08a2ed..9d0337e 100644
> --- a/arch/arm64/kernel/process.c
> +++ b/arch/arm64/kernel/process.c
> @@ -58,6 +58,7 @@
>  #include <asm/mmu_context.h>
>  #include <asm/processor.h>
>  #include <asm/stacktrace.h>
> +#include <asm/kexec.h>
>  
>  #ifdef CONFIG_CC_STACKPROTECTOR
>  #include <linux/stackprotector.h>
> @@ -107,6 +108,7 @@ void arch_cpu_idle_dead(void)
>  void machine_shutdown(void)
>  {
>  	disable_nonboot_cpus();
> +	machine_kexec_mask_interrupts();
>  }
>  
>  /*
> -- 
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>