Re: [Qemu-devel] [PATCH 1/5] hw: arm_gic: Fix gic_set_irq handling

[Christoffer Dall <christoffer.dall@linaro.org>]

On Fri, Sep 06, 2013 at 02:59:08PM +0100, Peter Maydell wrote:
> On 23 August 2013 21:10, Christoffer Dall <christoffer.dall@linaro.org> wrote:
> > For some reason only edge-triggered or enabled level-triggered
> > interrupts would set the pending state of a raised IRQ.  This is not in
> > compliance with the specs, which indicate that the pending state is
> > separate from the enabled state, which only controls if a pending
> > interrupt is actually forwarded to the CPU interface.
> >
> > Therefore, simply always set the pending state on a rising edge, but
> > only clear the pending state of falling edge if the interrupt is level
> > triggered.
> >
> > Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
> > ---
> >  hw/intc/arm_gic.c |    9 +++++----
> >  1 file changed, 5 insertions(+), 4 deletions(-)
> >
> > diff --git a/hw/intc/arm_gic.c b/hw/intc/arm_gic.c
> > index d431b7a..bff3f9e 100644
> > --- a/hw/intc/arm_gic.c
> > +++ b/hw/intc/arm_gic.c
> > @@ -128,11 +128,12 @@ static void gic_set_irq(void *opaque, int irq, int level)
> >
> >      if (level) {
> >          GIC_SET_LEVEL(irq, cm);
> > -        if (GIC_TEST_TRIGGER(irq) || GIC_TEST_ENABLED(irq, cm)) {
> > -            DPRINTF("Set %d pending mask %x\n", irq, target);
> > -            GIC_SET_PENDING(irq, target);
> > -        }
> > +        DPRINTF("Set %d pending mask %x\n", irq, target);
> > +        GIC_SET_PENDING(irq, target);
> >      } else {
> > +        if (!GIC_TEST_TRIGGER(irq)) {
> > +            gic_clear_pending(s, irq, target, 0);
> > +        }
> >          GIC_CLEAR_LEVEL(irq, cm);
> >      }
> >      gic_update(s);
> 
> This doesn't compile:
> 
> hw/intc/arm_gic.c: In function ‘gic_set_irq’:
> hw/intc/arm_gic.c:135:13: error: implicit declaration of function
> ‘gic_clear_pending’ [-Werror=implicit-function-declaration]
> hw/intc/arm_gic.c:135:13: error: nested extern declaration of
> ‘gic_clear_pending’ [-Werror=nested-externs]
> 
> (you don't provide that function until patch 3).
> 
whoops, should be GIC_CLEAR_PENDING at this stage. Thanks for testing
the bisectability.

-Christoffer