Re: [kvm-unit-tests PATCH v3 07/14] arm/arm64: gicv3: Enable/Disable LPIs at re-distributor level

[Andrew Jones <drjones@redhat.com>]

On Fri, Feb 07, 2020 at 01:14:37PM +0100, Andrew Jones wrote:
> On Tue, Jan 28, 2020 at 11:34:52AM +0100, Eric Auger wrote:
> > This helper function controls the signaling of LPIs at
> > redistributor level.
> > 
> > Signed-off-by: Eric Auger <eric.auger@redhat.com>
> > 
> > ---
> > 
> > v2 -> v3:
> > - move the helper in lib/arm/gic-v3.c
> > - rename the function with gicv3_lpi_ prefix
> > - s/report_abort/assert
> > ---
> >  lib/arm/asm/gic-v3.h |  1 +
> >  lib/arm/gic-v3.c     | 17 +++++++++++++++++
> >  2 files changed, 18 insertions(+)
> > 
> > diff --git a/lib/arm/asm/gic-v3.h b/lib/arm/asm/gic-v3.h
> > index ec2a6f0..734c0c0 100644
> > --- a/lib/arm/asm/gic-v3.h
> > +++ b/lib/arm/asm/gic-v3.h
> > @@ -96,6 +96,7 @@ extern void gicv3_lpi_set_config(int n, u8 val);
> >  extern u8 gicv3_lpi_get_config(int n);
> >  extern void gicv3_lpi_set_pending_table_bit(int rdist, int n, bool set);
> >  extern void gicv3_lpi_alloc_tables(void);
> > +extern void gicv3_lpi_rdist_ctrl(u32 redist, bool set);
> >  
> >  static inline void gicv3_do_wait_for_rwp(void *base)
> >  {
> > diff --git a/lib/arm/gic-v3.c b/lib/arm/gic-v3.c
> > index c33f883..7865d01 100644
> > --- a/lib/arm/gic-v3.c
> > +++ b/lib/arm/gic-v3.c
> > @@ -210,4 +210,21 @@ void gicv3_lpi_set_pending_table_bit(int rdist, int n, bool set)
> >  		byte &= ~mask;
> >  	*ptr = byte;
> >  }
> > +
> > +void gicv3_lpi_rdist_ctrl(u32 redist, bool set)
> 
> _set_clr_ ?

No, probably not _set_clr_ here. The function could be
static though, with other functions to enable/disable

void gicv3_lpi_rdist_enable(redist) { gicv3_lpi_rdist_ctrl(redist, true); }
void gicv3_lpi_rdist_disable(redist) { gicv3_lpi_rdist_ctrl(redist, false); }

But whatever.

> 
> > +{
> > +	void *ptr;
> > +	u64 val;
> > +
> > +	assert(redist < nr_cpus);
> > +
> > +	ptr = gicv3_data.redist_base[redist];
> > +	val = readl(ptr + GICR_CTLR);
> > +	if (set)
> > +		val |= GICR_CTLR_ENABLE_LPIS;
> > +	else
> > +		val &= ~GICR_CTLR_ENABLE_LPIS;
> > +	writel(val,  ptr + GICR_CTLR);
> > +}
> >  #endif /* __aarch64__ */
> > +
> 
> stray blank line here
> 
> > -- 
> > 2.20.1
> >
> 
> I'm not sure why this needs its own patch. I could just be part of the
> next patch.
> 
> Thanks,
> drew
>