[RFC 5/9] VFIO: Extend external user API

Eric Auger
2014-08-25T13:30:05Z

New functions are added to be called from ARM KVM-VFIO device.

- vfio_device_get_external_user enables to get a vfio device from
its fd
- vfio_device_put_external_user puts the vfio device
- vfio_external_get_type enables to retrieve the type of the device
(PCI or platform)
- vfio_external_get_base_device enables to get the
struct device*, useful to access the platform_device

Signed-off-by: Eric Auger <eric.auger@linaro.org>
---
drivers/vfio/vfio.c | 35 +++++++++++++++++++++++++++++++++++
include/linux/vfio.h | 4 ++++
2 files changed, 39 insertions(+)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 8e84471..c93b9e4 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1401,6 +1401,41 @@ 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);
+
+int vfio_external_get_type(struct vfio_device *vdev)
+{
+ if (!strcmp(vdev->ops->name, "vfio-platform"))
+ return VFIO_DEVICE_FLAGS_PLATFORM;
+ else if (!strcmp(vdev->ops->name, "vfio-pci"))
+ return VFIO_DEVICE_FLAGS_PCI;
+ else
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(vfio_external_get_type);
+
+struct device *vfio_external_get_base_device(struct vfio_device *vdev)
+{
+ return vdev->dev;
+}
+EXPORT_SYMBOL_GPL(vfio_external_get_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 ffe04ed..19e98eb 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -99,6 +99,10 @@ 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 int vfio_external_get_type(struct vfio_device *vdev);
+extern struct device *vfio_external_get_base_device(struct vfio_device *vdev);

struct pci_dev;
#ifdef CONFIG_EEH
--
1.9.1