Re: [Xen-devel] [PATCH v3 10/17] arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sat, 23 Jan 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> 
> When booting with ACPI, it could get the event-channel irq through
> HVM_PARAM_CALLBACK_IRQ.
> 
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> ---
>  arch/arm/xen/enlighten.c | 36 +++++++++++++++++++++++++++++++++++-
>  1 file changed, 35 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index 6d90a62..0e010bb 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -29,6 +29,7 @@
>  #include <linux/time64.h>
>  #include <linux/timekeeping.h>
>  #include <linux/timekeeper_internal.h>
> +#include <linux/acpi.h>
>  
>  #include <linux/mm.h>
>  
> @@ -262,6 +263,35 @@ void __init xen_early_init(void)
>               add_preferred_console("hvc", 0, NULL);
>  }
>  
> +static void __init xen_acpi_guest_init_events_irq(void)

please rename it to "xen_acpi_guest_init"


> +{
> +#ifdef CONFIG_ACPI
> +     struct xen_hvm_param a;
> +     int interrupt, trigger, polarity;
> +
> +     a.domid = DOMID_SELF;
> +     a.index = HVM_PARAM_CALLBACK_IRQ;
> +     xen_events_irq = 0;
> +
> +     if (!HYPERVISOR_hvm_op(HVMOP_get_param, &a)) {
> +             if ((a.value >> 56) == HVM_PARAM_CALLBACK_TYPE_EVENT) {
> +                     interrupt = a.value & 0xff;
> +                     trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
> +                                                      : ACPI_LEVEL_SENSITIVE;
> +                     polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
> +                                                       : ACPI_ACTIVE_HIGH;
> +                     xen_events_irq = acpi_register_gsi(NULL, interrupt,
> +                                                        trigger, polarity);
> +             }
> +     }
> +#endif
> +}
> +
> +static void __init xen_dt_guest_init_events_irq(void)

"xen_dt_guest_init"

Provided that you make these two changes:

Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>



> +{
> +     xen_events_irq = irq_of_parse_and_map(xen_node, 0);
> +}
> +
>  static int __init xen_guest_init(void)
>  {
>       struct xen_add_to_physmap xatp;
> @@ -270,7 +300,11 @@ static int __init xen_guest_init(void)
>       if (!xen_domain())
>               return 0;
>  
> -     xen_events_irq = irq_of_parse_and_map(xen_node, 0);
> +     if (!acpi_disabled)
> +             xen_acpi_guest_init_events_irq();
> +     else
> +             xen_dt_guest_init_events_irq();
> +
>       if (!xen_events_irq) {
>               pr_err("Xen event channel interrupt not found\n");
>               return -ENODEV;
> -- 
> 2.0.4
> 
> 

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