Re: [Xen-devel] [PATCH 2/8] arm/gic-v3: Fold GICR subtable parsing into a new function

[Julien Grall <julien.grall@xxxxxxx>]

Hello Shanker,

On 19/06/16 00:45, Shanker Donthineni wrote:
> Add a new function for parsing GICR subtable and move the code
> that is specific to GICR table to new function without changing
> the function gicv3_acpi_init() behavior.
>
> Signed-off-by: Shanker Donthineni <shankerd@xxxxxxxxxxxxxx>
> ---
>   xen/arch/arm/gic-v3.c | 64 +++++++++++++++++++++++++++++++++------------------
>   1 file changed, 42 insertions(+), 22 deletions(-)
>
> diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
> index ab1f380..af12ebc 100644
> --- a/xen/arch/arm/gic-v3.c
> +++ b/xen/arch/arm/gic-v3.c
> @@ -1387,6 +1387,36 @@ gic_acpi_parse_madt_distributor(struct 
> acpi_subtable_header *header,
>
>       return 0;
>   }
> +
> +static int __init
> +gic_acpi_parse_madt_redistributor(struct acpi_subtable_header *header,
> +                                  const unsigned long end)
> +{
> +    struct acpi_madt_generic_redistributor *rdist;
> +    struct rdist_region *region;
> +
> +    region = gicv3.rdist_regions + gicv3.rdist_count;
> +    rdist = (struct acpi_madt_generic_redistributor *)header;
> +    if ( BAD_MADT_ENTRY(rdist, end) )
> +        return -EINVAL;
> +
> +    if ( !rdist->base_address || !rdist->length )
> +        return -EINVAL;
> +
> +    region->base = rdist->base_address;
> +    region->size = rdist->length;
> +
> +    region->map_base = ioremap_nocache(region->base, region->size);
In the commit message you said there is no functional change, however 
the remapping is not part of gicv3_acpi_init. So why did you add this 
line here?
> +    if ( !region->map_base )
> +    {
> +        printk("Unable to map GICR registers\n");
> +        return -ENOMEM;
> +    }
> +    gicv3.rdist_count++;
> +
> +    return 0;
> +}
> +
[...]

Regards,

--
Julien Grall

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