linux-kernel - Re: [RFC 2/3] VFIO: platform: export platform callbacks, probe and remove

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Date:	Fri, 17 Apr 2015 08:29:19 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Eric Auger <eric.auger@...aro.org>
Cc:	eric.auger@...com, christoffer.dall@...aro.org,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	kvm@...r.kernel.org, agraf@...e.de,
	b.reynal@...tualopensystems.com, linux-kernel@...r.kernel.org,
	patches@...aro.org, Bharat.Bhushan@...escale.com
Subject: Re: [RFC 2/3] VFIO: platform: export platform callbacks, probe and
 remove

On Fri, 2015-04-17 at 15:37 +0200, Eric Auger wrote:
> We intend to derive the platform driver into specialized ones, featuring
> reset modality. In order to avoid duplication, let's export the functions
> that can be reused in all vfio_platform drivers:
> - get_platform_resource
> - get_platform_irq
> - vfio_platform_probe
> - vfio_platform_remove
> 
> Practically, only the vfio_platform_probe method should need to be
> overridden.
> 
> Signed-off-by: Eric Auger <eric.auger@...aro.org>
> ---
>  drivers/vfio/platform/vfio_platform.c         | 14 +++++++++-----
>  drivers/vfio/platform/vfio_platform_private.h |  7 +++++++
>  2 files changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
> index cef645c..81adb03 100644
> --- a/drivers/vfio/platform/vfio_platform.c
> +++ b/drivers/vfio/platform/vfio_platform.c
> @@ -25,8 +25,8 @@
>  
>  /* probing devices from the linux platform bus */
>  
> -static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
> -					      int num)
> +struct resource *get_platform_resource(struct vfio_platform_device *vdev,
> +				      int num)
>  {
>  	struct platform_device *dev = (struct platform_device *) vdev->opaque;
>  	int i;
> @@ -43,15 +43,17 @@ static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
>  	}
>  	return NULL;
>  }
> +EXPORT_SYMBOL_GPL(get_platform_resource);

Consider the global namespace if you're going to export these.  They
should be localized, preferably using the vfio_platform_ prefix.

>  
> -static int get_platform_irq(struct vfio_platform_device *vdev, int i)
> +int get_platform_irq(struct vfio_platform_device *vdev, int i)
>  {
>  	struct platform_device *pdev = (struct platform_device *) vdev->opaque;
>  
>  	return platform_get_irq(pdev, i);
>  }
> +EXPORT_SYMBOL_GPL(get_platform_irq);
>  
> -static int vfio_platform_probe(struct platform_device *pdev)
> +int vfio_platform_probe(struct platform_device *pdev)
>  {
>  	struct vfio_platform_device *vdev;
>  	int ret;
> @@ -72,8 +74,9 @@ static int vfio_platform_probe(struct platform_device *pdev)
>  
>  	return ret;
>  }
> +EXPORT_SYMBOL_GPL(vfio_platform_probe);
>  
> -static int vfio_platform_remove(struct platform_device *pdev)
> +int vfio_platform_remove(struct platform_device *pdev)
>  {
>  	struct vfio_platform_device *vdev;
>  
> @@ -85,6 +88,7 @@ static int vfio_platform_remove(struct platform_device *pdev)
>  
>  	return -EINVAL;
>  }
> +EXPORT_SYMBOL_GPL(vfio_platform_remove);
>  
>  static struct platform_driver vfio_platform_driver = {
>  	.probe		= vfio_platform_probe,
> diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
> index 0a20028..e2b4f0b 100644
> --- a/drivers/vfio/platform/vfio_platform_private.h
> +++ b/drivers/vfio/platform/vfio_platform_private.h
> @@ -95,4 +95,11 @@ extern int vfio_platform_external_set_automasked(void *device_data,
>  						 unsigned count,
>  						 bool automasked);
>  
> +struct platform_device;
> +struct resource *get_platform_resource(struct vfio_platform_device *vdev,
> +					int num);
> +int get_platform_irq(struct vfio_platform_device *vdev, int i);
> +int vfio_platform_probe(struct platform_device *pdev);
> +int vfio_platform_remove(struct platform_device *pdev);
> +
>  #endif /* VFIO_PLATFORM_PRIVATE_H */



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