Re: [Xen-devel] [PATCH v3 24/62] arm: Introduce a generic way to use a device from acpi

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Shannon,

On 17/11/15 09:40, shannon.zhao@xxxxxxxxxx wrote:
> From: Parth Dixit <parth.dixit@xxxxxxxxxx>
> 
> Add generic way to use device from acpi similar to the way it is
> supported in device tree.
> 
> Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> ---
>  xen/arch/arm/device.c        | 19 +++++++++++++++++++
>  xen/arch/arm/xen.lds.S       |  7 +++++++
>  xen/include/asm-arm/device.h | 30 ++++++++++++++++++++++++++++++
>  3 files changed, 56 insertions(+)
> 
> diff --git a/xen/arch/arm/device.c b/xen/arch/arm/device.c
> index 0b53f6a..5494de0 100644
> --- a/xen/arch/arm/device.c
> +++ b/xen/arch/arm/device.c
> @@ -22,6 +22,7 @@
>  #include <xen/lib.h>
>  
>  extern const struct device_desc _sdevice[], _edevice[];
> +extern const struct acpi_device_desc _asdevice[], _aedevice[];
>  
>  int __init device_init(struct dt_device_node *dev, enum device_class class,
>                         const void *data)
> @@ -50,6 +51,24 @@ int __init device_init(struct dt_device_node *dev, enum 
> device_class class,
>      return -EBADF;
>  }
>  
> +int __init acpi_device_init(enum device_class class, const void *data, int 
> class_type)

As said on a previous version, please explain what means class_type and
how this will fit with every
ACPI device tables.

AFAICT, it does only works for SPCR table used for UART device. For the
GIC you've hardcoded the value and I can't find any version number in
the table.

You may need to introduce another way to find the device such as a
callback taking the table in parameter.

Regards,

-- 
Julien Grall

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