linux-kernel - Re: [PATCH 5/9] powerpc/85xx: disable irq by hardware when suspend for 64-bit

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Date:	Tue, 11 Mar 2014 18:51:20 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Chenhui Zhao <chenhui.zhao@...escale.com>
CC:	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<leoli@...escale.com>, <Jason.Jin@...escale.com>
Subject: Re: [PATCH 5/9] powerpc/85xx: disable irq by hardware when suspend
 for 64-bit

On Fri, 2014-03-07 at 12:58 +0800, Chenhui Zhao wrote:
> In 64-bit mode, kernel just clears the irq soft-enable flag
> in struct paca_struct to disable external irqs. But, in
> the case of suspend, irqs should be disabled by hardware.
> Therefore, hook a function to ppc_md.suspend_disable_irqs
> to really disable irqs.
> 
> Signed-off-by: Chenhui Zhao <chenhui.zhao@...escale.com>
> ---
>  arch/powerpc/platforms/85xx/corenet_generic.c |   12 ++++++++++++
>  1 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/85xx/corenet_generic.c b/arch/powerpc/platforms/85xx/corenet_generic.c
> index 3fdf9f3..983d81f 100644
> --- a/arch/powerpc/platforms/85xx/corenet_generic.c
> +++ b/arch/powerpc/platforms/85xx/corenet_generic.c
> @@ -32,6 +32,13 @@
>  #include <sysdev/fsl_pci.h>
>  #include "smp.h"
>  
> +#if defined(CONFIG_PPC64) && defined(CONFIG_SUSPEND)
> +static void fsl_suspend_disable_irqs(void)
> +{
> +	__hard_irq_disable();
> +}
> +#endif

Why the underscore version?  Don't you want PACA_IRQ_HARD_DIS to be set?

If hard disabling is appropriate here, shouldn't we do it in
generic_suspend_disable_irqs()?

Are there any existing platforms that supply a
ppc_md.suspend_disable_irqs()?  I don't see any when grepping.

-Scott


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