Re: [Xen-devel] [PATCH] xen/arm: Handle translated addresses for hardware domains in GICv2

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 25/02/15 11:14, Frediano Ziglio wrote:
> Translated address (in d->arch.vgic.{c,d}base) are now bus addresses

addresses

> which could not always be applied to the DT.
> Copy the original address from DT directly to get the original

addresses

> untraslated reg property which will give same d->arch.vgic.{c,d}base

untranslated

> values once translated again.
> 
> Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>
> ---
>  xen/arch/arm/gic-v2.c | 26 +++++++++++++++-----------
>  1 file changed, 15 insertions(+), 11 deletions(-)
> 
> Updated comment and commit message as requested.
> 
> diff --git a/xen/arch/arm/gic-v2.c b/xen/arch/arm/gic-v2.c
> index 31fb81a..6899ab1 100644
> --- a/xen/arch/arm/gic-v2.c
> +++ b/xen/arch/arm/gic-v2.c
> @@ -590,7 +590,7 @@ static int gicv2_make_dt_node(const struct domain *d,
>      const struct dt_device_node *gic = dt_interrupt_controller;
>      const void *compatible = NULL;
>      u32 len;
> -    __be32 *new_cells, *tmp;
> +    const __be32 *regs;
>      int res = 0;
>  
>      compatible = dt_get_property(gic, "compatible", &len);
> @@ -617,18 +617,22 @@ static int gicv2_make_dt_node(const struct domain *d,
>      if ( res )
>          return res;
>  
> -    len = dt_cells_to_size(dt_n_addr_cells(node) + dt_n_size_cells(node));
> -    len *= 2; /* GIC has two memory regions: Distributor + CPU interface */
> -    new_cells = xzalloc_bytes(len);
> -    if ( new_cells == NULL )
> -        return -FDT_ERR_XEN(ENOMEM);
> +    /*
> +     * Copy only GICC and GICD regions, not entire regions.
> +     * DTB provides up to 4 regions to handle virtualization
> +     * however dom0 just needs GICC and GICD provided by Xen.

The 2 sentences say pretty much the same things. Although, the second
one is more complete. I would only keep the second one.

> +     */
> +    regs = dt_get_property(gic, "reg", &len);
> +    if ( !regs )
> +    {
> +        dprintk(XENLOG_ERR, "Can't find reg property for the gic node\n");
> +        return -FDT_ERR_XEN(ENOENT);
> +    }
>  
> -    tmp = new_cells;
> -    dt_set_range(&tmp, node, d->arch.vgic.dbase, PAGE_SIZE);
> -    dt_set_range(&tmp, node, d->arch.vgic.cbase, PAGE_SIZE * 2);
> +    len = dt_cells_to_size(dt_n_addr_cells(node) + dt_n_size_cells(node));
> +    len *= 2;
>  
> -    res = fdt_property(fdt, "reg", new_cells, len);
> -    xfree(new_cells);
> +    res = fdt_property(fdt, "reg", regs, len);
>  
>      return res;
>  }
> 


Regards,

-- 
Julien Grall

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