Re: [Xen-devel] [PATCH v2 2/2] xen/arm: GICv3: Only initialize ITS when the distributor supports LPIs.
On Wed, 24 Jan 2018, Julien Grall wrote: > There are firmware tables out describing the ITS but does not support > LPIs. This will result to a data abort when trying to initialize ITS. > > While this can be consider a bug in the Device-Tree, same configuration > boots on Linux. So gate the ITS initialization with the support of LPIs > in the distributor. > > Signed-off-by: Julien GrallReviewed-by: Stefano Stabellini > --- > xen/arch/arm/gic-v3.c | 14 +++--- > 1 file changed, 11 insertions(+), 3 deletions(-) > > diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c > index 9f9cf59f82..730450e34b 100644 > --- a/xen/arch/arm/gic-v3.c > +++ b/xen/arch/arm/gic-v3.c > @@ -1637,6 +1637,11 @@ static unsigned long > gicv3_get_hwdom_extra_madt_size(const struct domain *d) > } > #endif > > +static bool gic_dist_supports_lpis(void) > +{ > +return (readl_relaxed(GICD + GICD_TYPER) & GICD_TYPE_LPIS); > +} > + > /* Set up the GIC */ > static int __init gicv3_init(void) > { > @@ -1699,9 +1704,12 @@ static int __init gicv3_init(void) > > gicv3_dist_init(); > > -res = gicv3_its_init(); > -if ( res ) > -panic("GICv3: ITS: initialization failed: %d\n", res); > +if ( gic_dist_supports_lpis() ) > +{ > +res = gicv3_its_init(); > +if ( res ) > +panic("GICv3: ITS: initialization failed: %d\n", res); > +} > > res = gicv3_cpu_init(); > if ( res ) > -- > 2.11.0 > ___ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
[Xen-devel] [PATCH v2 2/2] xen/arm: GICv3: Only initialize ITS when the distributor supports LPIs.
There are firmware tables out describing the ITS but does not support LPIs. This will result to a data abort when trying to initialize ITS. While this can be consider a bug in the Device-Tree, same configuration boots on Linux. So gate the ITS initialization with the support of LPIs in the distributor. Signed-off-by: Julien Grall--- xen/arch/arm/gic-v3.c | 14 +++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c index 9f9cf59f82..730450e34b 100644 --- a/xen/arch/arm/gic-v3.c +++ b/xen/arch/arm/gic-v3.c @@ -1637,6 +1637,11 @@ static unsigned long gicv3_get_hwdom_extra_madt_size(const struct domain *d) } #endif +static bool gic_dist_supports_lpis(void) +{ +return (readl_relaxed(GICD + GICD_TYPER) & GICD_TYPE_LPIS); +} + /* Set up the GIC */ static int __init gicv3_init(void) { @@ -1699,9 +1704,12 @@ static int __init gicv3_init(void) gicv3_dist_init(); -res = gicv3_its_init(); -if ( res ) -panic("GICv3: ITS: initialization failed: %d\n", res); +if ( gic_dist_supports_lpis() ) +{ +res = gicv3_its_init(); +if ( res ) +panic("GICv3: ITS: initialization failed: %d\n", res); +} res = gicv3_cpu_init(); if ( res ) -- 2.11.0 ___ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel