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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: Vijay Mohan Pandarathil <vijaymohan.pandarathil@hp.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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@ -392,12 +392,13 @@ static void vfio_device_release(struct kref *kref)
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}
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/* Device reference always implies a group reference */
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static void vfio_device_put(struct vfio_device *device)
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void vfio_device_put(struct vfio_device *device)
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{
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struct vfio_group *group = device->group;
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kref_put_mutex(&device->kref, vfio_device_release, &group->device_lock);
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vfio_group_put(group);
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}
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EXPORT_SYMBOL_GPL(vfio_device_put);
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static void vfio_device_get(struct vfio_device *device)
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{
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@ -627,6 +628,33 @@ int vfio_add_group_dev(struct device *dev,
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}
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EXPORT_SYMBOL_GPL(vfio_add_group_dev);
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/**
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* Get a reference to the vfio_device for a device that is known to
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* be bound to a vfio driver. The driver implicitly holds a
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* vfio_device reference between vfio_add_group_dev and
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* vfio_del_group_dev. We can therefore use drvdata to increment
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* that reference from the struct device. This additional
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* reference must be released by calling vfio_device_put.
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*/
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struct vfio_device *vfio_device_get_from_dev(struct device *dev)
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{
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struct vfio_device *device = dev_get_drvdata(dev);
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vfio_device_get(device);
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return device;
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}
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EXPORT_SYMBOL_GPL(vfio_device_get_from_dev);
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/*
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* Caller must hold a reference to the vfio_device
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*/
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void *vfio_device_data(struct vfio_device *device)
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{
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return device->device_data;
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}
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EXPORT_SYMBOL_GPL(vfio_device_data);
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/* Given a referenced group, check if it contains the device */
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static bool vfio_dev_present(struct vfio_group *group, struct device *dev)
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{
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@ -45,6 +45,9 @@ extern int vfio_add_group_dev(struct device *dev,
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void *device_data);
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extern void *vfio_del_group_dev(struct device *dev);
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extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
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extern void vfio_device_put(struct vfio_device *device);
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extern void *vfio_device_data(struct vfio_device *device);
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/**
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* struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
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