[PATCH v3 10/15] vfio/fsl-mc: Use the new device life cycle helpers

Kevin Tian
2022-09-09T03:06:05Z

From: Yi Liu <yi.l.liu@intel.com>

Also add a comment to mark that vfio core releases device_set if @init
fails.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/vfio/fsl-mc/vfio_fsl_mc.c | 85 ++++++++++++++++++-------------
1 file changed, 49 insertions(+), 36 deletions(-)

diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index 42b344bd7cd5..b16874e913e4 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -418,16 +418,7 @@ static int vfio_fsl_mc_mmap(struct vfio_device *core_vdev,
return vfio_fsl_mc_mmap_mmio(vdev->regions[index], vma);
}

-static const struct vfio_device_ops vfio_fsl_mc_ops = {
- .name = "vfio-fsl-mc",
- .open_device = vfio_fsl_mc_open_device,
- .close_device = vfio_fsl_mc_close_device,
- .ioctl = vfio_fsl_mc_ioctl,
- .read = vfio_fsl_mc_read,
- .write = vfio_fsl_mc_write,
- .mmap = vfio_fsl_mc_mmap,
-};
-
+static const struct vfio_device_ops vfio_fsl_mc_ops;
static int vfio_fsl_mc_bus_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
@@ -518,35 +509,43 @@ static void vfio_fsl_uninit_device(struct vfio_fsl_mc_device *vdev)
bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb);
}

-static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
+static int vfio_fsl_mc_init_dev(struct vfio_device *core_vdev)
{
- struct vfio_fsl_mc_device *vdev;
- struct device *dev = &mc_dev->dev;
+ struct vfio_fsl_mc_device *vdev =
+ container_of(core_vdev, struct vfio_fsl_mc_device, vdev);
+ struct fsl_mc_device *mc_dev = to_fsl_mc_device(core_vdev->dev);
int ret;

- vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
- if (!vdev)
- return -ENOMEM;
-
- vfio_init_group_dev(&vdev->vdev, dev, &vfio_fsl_mc_ops);
vdev->mc_dev = mc_dev;
mutex_init(&vdev->igate);

if (is_fsl_mc_bus_dprc(mc_dev))
- ret = vfio_assign_device_set(&vdev->vdev, &mc_dev->dev);
+ ret = vfio_assign_device_set(core_vdev, &mc_dev->dev);
else
- ret = vfio_assign_device_set(&vdev->vdev, mc_dev->dev.parent);
- if (ret)
- goto out_uninit;
+ ret = vfio_assign_device_set(core_vdev, mc_dev->dev.parent);

- ret = vfio_fsl_mc_init_device(vdev);
if (ret)
- goto out_uninit;
+ return ret;
+
+ /* device_set is released by vfio core if @init fails */
+ return vfio_fsl_mc_init_device(vdev);
+}
+
+static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
+{
+ struct vfio_fsl_mc_device *vdev;
+ struct device *dev = &mc_dev->dev;
+ int ret;
+
+ vdev = vfio_alloc_device(vfio_fsl_mc_device, vdev, dev,
+ &vfio_fsl_mc_ops);
+ if (IS_ERR(vdev))
+ return PTR_ERR(vdev);

ret = vfio_register_group_dev(&vdev->vdev);
if (ret) {
dev_err(dev, "VFIO_FSL_MC: Failed to add to vfio group\n");
- goto out_device;
+ goto out_put_vdev;
}

ret = vfio_fsl_mc_scan_container(mc_dev);
@@ -557,30 +556,44 @@ static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)

out_group_dev:
vfio_unregister_group_dev(&vdev->vdev);
-out_device:
- vfio_fsl_uninit_device(vdev);
-out_uninit:
- vfio_uninit_group_dev(&vdev->vdev);
- kfree(vdev);
+out_put_vdev:
+ vfio_put_device(&vdev->vdev);
return ret;
}

+static void vfio_fsl_mc_release_dev(struct vfio_device *core_vdev)
+{
+ struct vfio_fsl_mc_device *vdev =
+ container_of(core_vdev, struct vfio_fsl_mc_device, vdev);
+
+ vfio_fsl_uninit_device(vdev);
+ mutex_destroy(&vdev->igate);
+ vfio_free_device(core_vdev);
+}
+
static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
{
struct device *dev = &mc_dev->dev;
struct vfio_fsl_mc_device *vdev = dev_get_drvdata(dev);

vfio_unregister_group_dev(&vdev->vdev);
- mutex_destroy(&vdev->igate);
-
dprc_remove_devices(mc_dev, NULL, 0);
- vfio_fsl_uninit_device(vdev);
-
- vfio_uninit_group_dev(&vdev->vdev);
- kfree(vdev);
+ vfio_put_device(&vdev->vdev);
return 0;
}

+static const struct vfio_device_ops vfio_fsl_mc_ops = {
+ .name = "vfio-fsl-mc",
+ .init = vfio_fsl_mc_init_dev,
+ .release = vfio_fsl_mc_release_dev,
+ .open_device = vfio_fsl_mc_open_device,
+ .close_device = vfio_fsl_mc_close_device,
+ .ioctl = vfio_fsl_mc_ioctl,
+ .read = vfio_fsl_mc_read,
+ .write = vfio_fsl_mc_write,
+ .mmap = vfio_fsl_mc_mmap,
+};
+
static struct fsl_mc_driver vfio_fsl_mc_driver = {
.probe = vfio_fsl_mc_probe,
.remove = vfio_fsl_mc_remove,
--
2.21.3