vfio: Remove vfio_free_device

With the "mess" sorted out, we should be able to inline the
vfio_free_device call introduced by commit cb9ff3f3b84c
("vfio: Add helpers for unifying vfio_device life cycle")
and remove them from driver release callbacks.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>	# vfio-ap part
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20221104142007.1314999-8-farman@linux.ibm.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 7a45e53..eee6805 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1461,7 +1461,6 @@ static void intel_vgpu_release_dev(struct vfio_device *vfio_dev)
        struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev);
 
        intel_gvt_destroy_vgpu(vgpu);
-       vfio_free_device(vfio_dev);
 }
 
 static const struct vfio_device_ops intel_vgpu_dev_ops = {

diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 1155f8b..598a381 100644 (file)
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -143,8 +143,6 @@ static void vfio_ccw_mdev_release_dev(struct vfio_device *vdev)
        kmem_cache_free(vfio_ccw_io_region, private->io_region);
        kfree(private->cp.guest_cp);
        mutex_destroy(&private->io_mutex);
-
-       vfio_free_device(vdev);
 }
 
 static void vfio_ccw_mdev_remove(struct mdev_device *mdev)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 0b4cc8c..f108c0f 100644 (file)
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -765,11 +765,6 @@ static void vfio_ap_mdev_unlink_fr_queues(struct ap_matrix_mdev *matrix_mdev)
        }
 }
 
-static void vfio_ap_mdev_release_dev(struct vfio_device *vdev)
-{
-       vfio_free_device(vdev);
-}
-
 static void vfio_ap_mdev_remove(struct mdev_device *mdev)
 {
        struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(&mdev->dev);
@@ -1784,7 +1779,6 @@ static const struct attribute_group vfio_queue_attr_group = {
 
 static const struct vfio_device_ops vfio_ap_matrix_dev_ops = {
        .init = vfio_ap_mdev_init_dev,
-       .release = vfio_ap_mdev_release_dev,
        .open_device = vfio_ap_mdev_open_device,
        .close_device = vfio_ap_mdev_close_device,
        .ioctl = vfio_ap_mdev_ioctl,

diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index b16874e..7b8889f 100644 (file)
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -568,7 +568,6 @@ static void vfio_fsl_mc_release_dev(struct vfio_device *core_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)

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index badc9d8..9be2d5b 100644 (file)
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -2109,7 +2109,6 @@ void vfio_pci_core_release_dev(struct vfio_device *core_vdev)
        mutex_destroy(&vdev->vma_lock);
        kfree(vdev->region);
        kfree(vdev->pm_save);
-       vfio_free_device(core_vdev);
 }
 EXPORT_SYMBOL_GPL(vfio_pci_core_release_dev);
 

diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
index eaea63e..18faf26 100644 (file)
--- a/drivers/vfio/platform/vfio_amba.c
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -95,7 +95,6 @@ static void vfio_amba_release_dev(struct vfio_device *core_vdev)
 
        vfio_platform_release_common(vdev);
        kfree(vdev->name);
-       vfio_free_device(core_vdev);
 }
 
 static void vfio_amba_remove(struct amba_device *adev)

diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
index 82cedce..9910451 100644 (file)
--- a/drivers/vfio/platform/vfio_platform.c
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -83,7 +83,6 @@ static void vfio_platform_release_dev(struct vfio_device *core_vdev)
                container_of(core_vdev, struct vfio_platform_device, vdev);
 
        vfio_platform_release_common(vdev);
-       vfio_free_device(core_vdev);
 }
 
 static int vfio_platform_remove(struct platform_device *pdev)

diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 2901b8a..9835757 100644 (file)
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -339,13 +339,10 @@ static void vfio_device_release(struct device *dev)
        vfio_release_device_set(device);
        ida_free(&vfio.device_ida, device->index);
 
-       /*
-        * kvfree() cannot be done here due to a life cycle mess in
-        * vfio-ccw. Before the ccw part is fixed all drivers are
-        * required to support @release and call vfio_free_device()
-        * from there.
-        */
-       device->ops->release(device);
+       if (device->ops->release)
+               device->ops->release(device);
+
+       kvfree(device);
 }
 
 static int vfio_init_device(struct vfio_device *device, struct device *dev,
@@ -424,17 +421,6 @@ out_uninit:
        return ret;
 }
 
-/*
- * The helper called by driver @release callback to free the device
- * structure. Drivers which don't have private data to clean can
- * simply use this helper as its @release.
- */
-void vfio_free_device(struct vfio_device *device)
-{
-       kvfree(device);
-}
-EXPORT_SYMBOL_GPL(vfio_free_device);
-
 static struct vfio_group *vfio_noiommu_group_alloc(struct device *dev,
                enum vfio_group_type type)
 {

diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index ba80926..e748015 100644 (file)
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -176,7 +176,6 @@ struct vfio_device *_vfio_alloc_device(size_t size, struct device *dev,
                                        dev, ops),                              \
                     struct dev_struct, member)
 
-void vfio_free_device(struct vfio_device *device);
 static inline void vfio_put_device(struct vfio_device *device)
 {
        put_device(&device->device);

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index 117a8d7..8b5a3a7 100644 (file)
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -594,7 +594,6 @@ static void mbochs_release_dev(struct vfio_device *vdev)
        atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes);
        kfree(mdev_state->pages);
        kfree(mdev_state->vconfig);
-       vfio_free_device(vdev);
 }
 
 static void mbochs_remove(struct mdev_device *mdev)

diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index 946e8cf..721fb06 100644 (file)
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -283,7 +283,6 @@ static void mdpy_release_dev(struct vfio_device *vdev)
 
        vfree(mdev_state->memblk);
        kfree(mdev_state->vconfig);
-       vfio_free_device(vdev);
 }
 
 static void mdpy_remove(struct mdev_device *mdev)

diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index e72085f..3c2a421 100644 (file)
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -784,7 +784,6 @@ static void mtty_release_dev(struct vfio_device *vdev)
 
        atomic_add(mdev_state->nr_ports, &mdev_avail_ports);
        kfree(mdev_state->vconfig);
-       vfio_free_device(vdev);
 }
 
 static void mtty_remove(struct mdev_device *mdev)