[RFC v5 05/13] VFIO: external user API for interaction with vfio devices
From: Eric Auger <hidden>
Date: 2015-03-19 15:03:01
Also in:
kvm, lkml
Subsystem:
the rest, vfio driver · Maintainers:
Linus Torvalds, Alex Williamson
The VFIO external user API is enriched with 3 new functions that allows a kernel user external to VFIO to retrieve some information from a VFIO device. - vfio_device_get_external_user enables to get a vfio device from its fd and increments its reference counter - vfio_device_put_external_user decrements the reference counter - vfio_external_base_device returns a handle to the struct device --- v3 -> v4: - change the commit title v2 -> v3: - reword the commit message v1 -> v2: - vfio_external_get_base_device renamed into vfio_external_base_device - vfio_external_get_type removed Signed-off-by: Eric Auger <redacted> --- drivers/vfio/vfio.c | 24 ++++++++++++++++++++++++ include/linux/vfio.h | 3 +++ 2 files changed, 27 insertions(+)
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 23ba12a..33ae8c5 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c@@ -1490,6 +1490,30 @@ void vfio_group_put_external_user(struct vfio_group *group) } EXPORT_SYMBOL_GPL(vfio_group_put_external_user); +struct vfio_device *vfio_device_get_external_user(struct file *filep) +{ + struct vfio_device *vdev = filep->private_data; + + if (filep->f_op != &vfio_device_fops) + return ERR_PTR(-EINVAL); + + vfio_device_get(vdev); + return vdev; +} +EXPORT_SYMBOL_GPL(vfio_device_get_external_user); + +void vfio_device_put_external_user(struct vfio_device *vdev) +{ + vfio_device_put(vdev); +} +EXPORT_SYMBOL_GPL(vfio_device_put_external_user); + +struct device *vfio_external_base_device(struct vfio_device *vdev) +{ + return vdev->dev; +} +EXPORT_SYMBOL_GPL(vfio_external_base_device); + int vfio_external_user_iommu_id(struct vfio_group *group) { return iommu_group_id(group->iommu_group);
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 683b514..b18c38f 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h@@ -101,6 +101,9 @@ extern void vfio_group_put_external_user(struct vfio_group *group); extern int vfio_external_user_iommu_id(struct vfio_group *group); extern long vfio_external_check_extension(struct vfio_group *group, unsigned long arg); +extern struct vfio_device *vfio_device_get_external_user(struct file *filep); +extern void vfio_device_put_external_user(struct vfio_device *vdev); +extern struct device *vfio_external_base_device(struct vfio_device *vdev); struct pci_dev; #ifdef CONFIG_EEH
--
1.9.1