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Subject[PATCH v2 1/3] VFIO: Wrappers for getting/putting reference to vfio_device
Date

- Added vfio_device_get_from_vdev(), vfio_device_put_vdev()
as wrappers to get/put 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>
---
drivers/vfio/vfio.c | 47 +++++++++++++++++++++++++++++++++++++++++------
include/linux/vfio.h | 3 +++
2 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 12c264d..c2ff1b2 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -642,8 +642,13 @@ int vfio_add_group_dev(struct device *dev,
}
EXPORT_SYMBOL_GPL(vfio_add_group_dev);

-/* Test whether a struct device is present in our tracking */
-static bool vfio_dev_present(struct device *dev)
+/**
+ * This does a get on the corresponding iommu_group,
+ * vfio_group and the vfio_device. Callers of this
+ * function will hae to call vfio_put_vdev() to
+ * remove the reference to all objects.
+ */
+void *vfio_device_get_from_dev(struct device *dev)
{
struct iommu_group *iommu_group;
struct vfio_group *group;
@@ -651,25 +656,55 @@ static bool vfio_dev_present(struct device *dev)

iommu_group = iommu_group_get(dev);
if (!iommu_group)
- return false;
+ return NULL;

group = vfio_group_get_from_iommu(iommu_group);
if (!group) {
iommu_group_put(iommu_group);
- return false;
+ return NULL;
}

device = vfio_group_get_device(group, dev);
if (!device) {
vfio_group_put(group);
iommu_group_put(iommu_group);
- return false;
+ return NULL;
}
+ return device;
+}
+EXPORT_SYMBOL_GPL(vfio_device_get_from_dev);
+
+void *vfio_device_data(void *data)
+{
+ struct vfio_device *device = data;
+ return device->device_data;
+}
+EXPORT_SYMBOL_GPL(vfio_device_data);
+
+void vfio_device_put_vdev(void *data)
+{
+ struct vfio_device *device = data;
+ struct vfio_group *group = device->group;
+ struct iommu_group *iommu_group = group->iommu_group;

vfio_device_put(device);
vfio_group_put(group);
iommu_group_put(iommu_group);
- return true;
+ return;
+}
+EXPORT_SYMBOL_GPL(vfio_device_put_vdev);
+
+/* Test whether a struct device is present in our tracking */
+static bool vfio_dev_present(struct device *dev)
+{
+ struct vfio_device *device;
+
+ device = vfio_device_get_from_dev(dev);
+ if (device) {
+ vfio_device_put_vdev(device);
+ return true;
+ } else
+ return false;
}

/*
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index ab9e862..e550c09 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -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 void *vfio_device_get_from_dev(struct device *dev);
+extern void vfio_device_put_vdev(void *device);
+extern void *vfio_device_data(void *device);

/**
* struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
--
1.7.11.3


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