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SubjectRe: [PATCH 5/9] powerpc/85xx: disable irq by hardware when suspend for 64-bit
On Fri, Mar 14, 2014 at 05:41:41PM -0500, Scott Wood wrote:
> On Wed, 2014-03-12 at 15:46 +0800, Chenhui Zhao wrote:
> > On Tue, Mar 11, 2014 at 06:51:20PM -0500, Scott Wood wrote:
> > > 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@freescale.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
> >
> > Will use hard_irq_disable().
> >
> > I think this is a general problem for powerpc.
> > Should clear MSR_EE before suspend. I agree to put it
> > in generic_suspend_disable_irqs().
>
> BTW, make sure you test this patchset with CONFIG_DEBUG_PREEMPT and
> similar debugging options to help ensure that the soft IRQ state is
> being tracked properly.
>
> -Scott

OK. I'll keep that in mind.

-Chenhui



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