Re: [PATCH v4 14/17] xen/arm: ITS: Add domain specific ITS initialization

[Julien Grall <julien.grall@citrix.com>]

Hi Vijay,

On 10/07/2015 09:42, vijay.kilari@gmail.com wrote:
> +void its_domain_init(struct domain *d)
> +{
> +    struct its_node *its;
> +
> +    if ( is_hardware_domain(d) )
> +    {
> +        /*
> +         * Only one virtual ITS is provided to domain.
> +         * Assign first physical ITS address to Dom0 virtual ITS.
> +         */
> +        its = list_first_entry(&its_nodes, struct its_node, entry);
> +        d->arch.vits->gits_base = its->phys_base;
> +        d->arch.vits->gits_size = its->phys_size;
> +    }
> +    /* TODO: DomU */
> +}
> +

With the new vGIC infrastructure, anything related to domain 
initialization is done in the vGIC.

>   static int its_probe(struct dt_device_node *node)
>   {
>       paddr_t its_addr, its_size;
> diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
> index 06f8e54..3bd1f2e 100644
> --- a/xen/arch/arm/setup.c
> +++ b/xen/arch/arm/setup.c
> @@ -776,7 +776,9 @@ void __init start_xen(unsigned long boot_phys_offset,
>       init_xen_time();
>
>       gic_init();
> -
> +#ifdef CONFIG_ARM_64
> +    vgic_its_init();
> +#endif
>       p2m_vmid_allocator_init();
>
>       softirq_init();

[...]

> +void vgic_its_init(void)
> +{
> +    if ( gic_lpi_supported() )
> +        its_lpi_init(gic_nr_id_bits());
> +}
> +

As said on patch #3 its_lpi_init can be called in its_init.

In any anycase, it's not the goal of the vGIC to initialize the ITS driver.

[...]

> diff --git a/xen/include/asm-arm/gic_v3_defs.h b/xen/include/asm-arm/gic_v3_defs.h
> index 368ebb3..24ef547 100644
> --- a/xen/include/asm-arm/gic_v3_defs.h
> +++ b/xen/include/asm-arm/gic_v3_defs.h
> @@ -243,6 +243,8 @@
>   #define GITS_BASER_TYPE_RESERVED5       5
>   #define GITS_BASER_TYPE_RESERVED6       6
>   #define GITS_BASER_TYPE_RESERVED7       7
> +#define GITS_BASER_INIT_VAL             ((1UL << GITS_BASER_TYPE_SHIFT) | \
> +                                         (0x7UL << GITS_BASER_ENTRY_SIZE_SHIFT))

Please keep this define within the vgic ITS code.

Regards,

-- 
Julien Grall