Re: [Xen-devel] [PATCH RFC 05/18] OvmfPkg/XenbusDxe: Open PciIo protocol.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Jul 16, 2014 at 04:15:34PM +0100, Anthony PERARD wrote:
> Contributed-under: TianoCore Contribution Agreement 1.0
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>

Could you describe a bit why you need to use it?

I think I know why - that is you need to poke at its IO ports
but it would be good to mention that in here.

> ---
>  OvmfPkg/XenbusDxe/XenbusDxe.c | 16 ++++++++++++++++
>  OvmfPkg/XenbusDxe/XenbusDxe.h |  1 +
>  2 files changed, 17 insertions(+)
> 
> diff --git a/OvmfPkg/XenbusDxe/XenbusDxe.c b/OvmfPkg/XenbusDxe/XenbusDxe.c
> index 63ea31b..ba5e8f4 100644
> --- a/OvmfPkg/XenbusDxe/XenbusDxe.c
> +++ b/OvmfPkg/XenbusDxe/XenbusDxe.c
> @@ -290,11 +290,25 @@ XenbusDxeDriverBindingStart (
>  {
>    EFI_STATUS Status;
>    XENBUS_DEVICE *Dev;
> +  EFI_PCI_IO_PROTOCOL *PciIo;
> +
> +  Status = gBS->OpenProtocol (
> +                     ControllerHandle,
> +                     &gEfiPciIoProtocolGuid,
> +                     (VOID **)&PciIo,
> +                     This->DriverBindingHandle,
> +                     ControllerHandle,
> +                     EFI_OPEN_PROTOCOL_BY_DRIVER
> +                     );
> +  if (EFI_ERROR (Status)) {
> +    return Status;
> +  }
>  
>    Dev = AllocateZeroPool (sizeof (*Dev));
>    Dev->Signature = XENBUS_DEVICE_SIGNATURE;
>    Dev->This = This;
>    Dev->ControllerHandle = ControllerHandle;
> +  Dev->PciIo = PciIo;
>  
>    Status = XenHyperpageInit (Dev);
>    ASSERT_EFI_ERROR (Status);
> @@ -351,5 +365,7 @@ XenbusDxeDriverBindingStop (
>  
>    gBS->CloseEvent (Dev->ExitBootEvent);
>  
> +  gBS->CloseProtocol(ControllerHandle, &gEfiPciIoProtocolGuid,
> +         This->DriverBindingHandle, ControllerHandle);
>    return EFI_SUCCESS;
>  }
> diff --git a/OvmfPkg/XenbusDxe/XenbusDxe.h b/OvmfPkg/XenbusDxe/XenbusDxe.h
> index 6140f94..d57e3c8 100644
> --- a/OvmfPkg/XenbusDxe/XenbusDxe.h
> +++ b/OvmfPkg/XenbusDxe/XenbusDxe.h
> @@ -84,6 +84,7 @@ struct _XENBUS_DEVICE {
>    UINT32                        Signature;
>    EFI_DRIVER_BINDING_PROTOCOL   *This;
>    EFI_HANDLE                    ControllerHandle;
> +  EFI_PCI_IO_PROTOCOL           *PciIo;
>    EFI_EVENT                     ExitBootEvent;
>  
>    VOID                          *Hyperpage;
> -- 
> Anthony PERARD
> 
> 
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