Re: [Xen-devel] [PATCH 3/7] ARM: GICv3: emit optional DT property only when necessary

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Andre,

On 24/01/18 14:35, Andre Przywara wrote:
> The ARM GICv3 DT property "#redistributor-regions" is optional and only
> useful if it has any other values than the architected "1".
> Keep our generated DT node clean by emitting this property only if we
> actually need more than one region.
I really don't see the benefits of this patch. It is fine to have 
#redistributor-regions property in the DT. You might "clean" the DT but 
make the code a bit more complex.
Cheers,

> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxxxxx>
> ---
>   xen/arch/arm/gic-v3.c | 11 +++++++----
>   1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
> index a0d290b55c..9ad0cd19ef 100644
> --- a/xen/arch/arm/gic-v3.c
> +++ b/xen/arch/arm/gic-v3.c
> @@ -1168,10 +1168,13 @@ static int gicv3_make_hwdom_dt_node(const struct domain 
> *d,
>       if ( res )
>           return res;
>   
> -    res = fdt_property_cell(fdt, "#redistributor-regions",
> -                            d->arch.vgic.nr_regions);
> -    if ( res )
> -        return res;
> +    if ( d->arch.vgic.nr_regions > 1 )
> +    {
> +        res = fdt_property_cell(fdt, "#redistributor-regions",
> +                                d->arch.vgic.nr_regions);
> +        if ( res )
> +            return res;
> +    }
>   
>       len = dt_cells_to_size(dt_n_addr_cells(gic) + dt_n_size_cells(gic));
>       /*
--
Julien Grall

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