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Commit 44f50716 authored by Vijay Mohan Pandarathil's avatar Vijay Mohan Pandarathil Committed by Alex Williamson
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VFIO: Wrapper for getting reference to vfio_device 



- Added vfio_device_get_from_dev() as wrapper to get
  reference to vfio_device from struct device.

- Added vfio_device_data() as a wrapper to get device_data from
  vfio_device.

Signed-off-by: default avatarVijay Mohan Pandarathil <vijaymohan.pandarathil@hp.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent f6161aa1

drivers/vfio/vfio.c

+29 −1
Original line number Diff line number Diff line
@@ -392,12 +392,13 @@ static void vfio_device_release(struct kref *kref) 
}



/* Device reference always implies a group reference */

static void vfio_device_put(struct vfio_device *device)

void vfio_device_put(struct vfio_device *device)

{

	struct vfio_group *group = device->group;

	kref_put_mutex(&device->kref, vfio_device_release, &group->device_lock);

	vfio_group_put(group);

}

EXPORT_SYMBOL_GPL(vfio_device_put);



static void vfio_device_get(struct vfio_device *device)

{
@@ -627,6 +628,33 @@ int vfio_add_group_dev(struct device *dev, 
}

EXPORT_SYMBOL_GPL(vfio_add_group_dev);



/**

 * Get a reference to the vfio_device for a device that is known to

 * be bound to a vfio driver.  The driver implicitly holds a

 * vfio_device reference between vfio_add_group_dev and

 * vfio_del_group_dev.  We can therefore use drvdata to increment

 * that reference from the struct device.  This additional

 * reference must be released by calling vfio_device_put.

 */

struct vfio_device *vfio_device_get_from_dev(struct device *dev)

{

	struct vfio_device *device = dev_get_drvdata(dev);



	vfio_device_get(device);



	return device;

}

EXPORT_SYMBOL_GPL(vfio_device_get_from_dev);



/*

 * Caller must hold a reference to the vfio_device

 */

void *vfio_device_data(struct vfio_device *device)

{

	return device->device_data;

}

EXPORT_SYMBOL_GPL(vfio_device_data);



/* Given a referenced group, check if it contains the device */

static bool vfio_dev_present(struct vfio_group *group, struct device *dev)

{

include/linux/vfio.h

+3 −0
Original line number Diff line number Diff line
@@ -45,6 +45,9 @@ extern int vfio_add_group_dev(struct device *dev, 
			      void *device_data);



extern void *vfio_del_group_dev(struct device *dev);

extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);

extern void vfio_device_put(struct vfio_device *device);

extern void *vfio_device_data(struct vfio_device *device);



/**

 * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks