Re: [Xen-devel] [PATCH v3 08/13] xen: arm: Handle cpus nodes with #address-cells > 1

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 11/25/2013 11:07 AM, Ian Campbell wrote:
> The APM X-Gene Mustang board DTS has #address-cells = 2.
>
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>

> ---
> v3: Correct check for property length (bytes not cells)
> v2: Use dt_read_number, check the property length
> ---
>   xen/arch/arm/smpboot.c |   34 +++++++++++++++++++++++++++++-----
>   1 file changed, 29 insertions(+), 5 deletions(-)
>
> diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
> index 6c90fa6..7636ab8 100644
> --- a/xen/arch/arm/smpboot.c
> +++ b/xen/arch/arm/smpboot.c
> @@ -125,18 +125,42 @@ void __init smp_init_cpus(void)
>
>       dt_for_each_child_node( cpus, cpu )
>       {
> -        u32 hwid;
> +        const __be32 *prop;
> +        u64 addr;
> +        u32 reg_len, hwid;
>
>           if ( !dt_device_type_is_equal(cpu, "cpu") )
>               continue;
>
> -        if ( !dt_property_read_u32(cpu, "reg", &hwid) )
> +        if ( dt_n_size_cells(cpu) != 0 )
> +            printk(XENLOG_WARNING "cpu node `%s`: #size-cells %d\n",
> +                   dt_node_full_name(cpu), dt_n_size_cells(cpu));
> +
> +        prop = dt_get_property(cpu, "reg", &reg_len);
> +        if ( !prop )
> +        {
> +            printk(XENLOG_WARNING "cpu node `%s`: has no reg property\n",
> +                   dt_node_full_name(cpu));
> +            continue;
> +        }
> +
> +        if ( reg_len < dt_cells_to_size(dt_n_addr_cells(cpu)) )
>           {
> -            printk(XENLOG_WARNING "cpu node `%s`: missing reg property\n",
> +            printk(XENLOG_WARNING "cpu node `%s`: reg property too short\n",
>                      dt_node_full_name(cpu));
>               continue;
>           }
>
> +        addr = dt_read_number(prop, dt_n_addr_cells(cpu));
> +
> +        hwid = addr;
> +        if ( hwid != addr )
> +        {
> +            printk(XENLOG_WARNING "cpu node `%s`: hwid overflow %"PRIx64"\n",
> +                   dt_node_full_name(cpu), addr);
> +            continue;
> +        }
> +
>           /*
>            * 8 MSBs must be set to 0 in the DT since the reg property
>            * defines the MPIDR[23:0]
> @@ -159,8 +183,8 @@ void __init smp_init_cpus(void)
>               if ( tmp_map[j] == hwid )
>               {
>                   printk(XENLOG_WARNING
> -                       "cpu node `%s`: duplicate /cpu reg properties in the 
> DT\n",
> -                       dt_node_full_name(cpu));
> +                       "cpu node `%s`: duplicate /cpu reg properties %"PRIx32" in 
> the DT\n",
> +                       dt_node_full_name(cpu), hwid);
>                   break;
>               }
>           }
--
Julien Grall

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