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Code Issues Releases Wiki Activity

vfio/ccw: move private to mdev lifecycle

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Now that the mdev parent data is split out into its own struct,
it is safe to move the remaining private data to follow the
mdev probe/remove lifecycle. The mdev parent data will remain
where it is, and follow the subchannel and the css driver
interfaces.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20221104142007.1314999-5-farman@linux.ibm.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Eric Farman 2022-11-04 15:20:04 +01:00 committed by Alex Williamson
parent 06caaa27df
commit 3d62fe18b6
3 changed files with 16 additions and 28 deletions
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16
drivers/s390/cio/vfio_ccw_drv.c
View file

@ -152,7 +152,7 @@ static void vfio_ccw_sch_irq(struct subchannel *sch)
vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_INTERRUPT);
}
static void vfio_ccw_free_private(struct vfio_ccw_private *private)
void vfio_ccw_free_private(struct vfio_ccw_private *private)
{
struct vfio_ccw_crw *crw, *temp;
@ -180,7 +180,6 @@ static void vfio_ccw_free_parent(struct device *dev)
static int vfio_ccw_sch_probe(struct subchannel *sch)
{
struct pmcw *pmcw = &sch->schib.pmcw;
struct vfio_ccw_private *private;
struct vfio_ccw_parent *parent;
int ret = -ENOMEM;
@ -201,14 +200,7 @@ static int vfio_ccw_sch_probe(struct subchannel *sch)
if (ret)
goto out_free;
private = kzalloc(sizeof(*private), GFP_KERNEL);
if (!private) {
device_unregister(&parent->dev);
return -ENOMEM;
}
dev_set_drvdata(&sch->dev, parent);
dev_set_drvdata(&parent->dev, private);
parent->mdev_type.sysfs_name = "io";
parent->mdev_type.pretty_name = "I/O subchannel (Non-QDIO)";
@ -227,25 +219,19 @@ static int vfio_ccw_sch_probe(struct subchannel *sch)
out_unreg:
device_unregister(&parent->dev);
out_free:
dev_set_drvdata(&parent->dev, NULL);
dev_set_drvdata(&sch->dev, NULL);
if (private)
vfio_ccw_free_private(private);
return ret;
}
static void vfio_ccw_sch_remove(struct subchannel *sch)
{
struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
struct vfio_ccw_private *private = dev_get_drvdata(&parent->dev);
mdev_unregister_parent(&parent->parent);
device_unregister(&parent->dev);
dev_set_drvdata(&sch->dev, NULL);
vfio_ccw_free_private(private);
VFIO_CCW_MSG_EVENT(4, "unbound from subchannel %x.%x.%04x\n",
sch->schid.cssid, sch->schid.ssid,
sch->schid.sch_no);

26
drivers/s390/cio/vfio_ccw_ops.c
View file

@ -100,15 +100,20 @@ static int vfio_ccw_mdev_probe(struct mdev_device *mdev)
{
struct subchannel *sch = to_subchannel(mdev->dev.parent);
struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
struct vfio_ccw_private *private = dev_get_drvdata(&parent->dev);
struct vfio_ccw_private *private;
int ret;
if (private->state == VFIO_CCW_STATE_NOT_OPER)
return -ENODEV;
private = kzalloc(sizeof(*private), GFP_KERNEL);
if (!private)
return -ENOMEM;
ret = vfio_init_device(&private->vdev, &mdev->dev, &vfio_ccw_dev_ops);
if (ret)
if (ret) {
kfree(private);
return ret;
}
dev_set_drvdata(&parent->dev, private);
VFIO_CCW_MSG_EVENT(2, "sch %x.%x.%04x: create\n",
sch->schid.cssid,
@ -122,6 +127,7 @@ static int vfio_ccw_mdev_probe(struct mdev_device *mdev)
return 0;
err_put_vdev:
dev_set_drvdata(&parent->dev, NULL);
vfio_put_device(&private->vdev);
return ret;
}
@ -131,15 +137,6 @@ static void vfio_ccw_mdev_release_dev(struct vfio_device *vdev)
struct vfio_ccw_private *private =
container_of(vdev, struct vfio_ccw_private, vdev);
/*
* We cannot free vfio_ccw_private here because it includes
* parent info which must be free'ed by css driver.
*
* Use a workaround by memset'ing the core device part and
* then notifying the remove path that all active references
* to this device have been released.
*/
memset(vdev, 0, sizeof(*vdev));
complete(&private->release_comp);
}
@ -156,6 +153,7 @@ static void vfio_ccw_mdev_remove(struct mdev_device *mdev)
vfio_unregister_group_dev(&private->vdev);
dev_set_drvdata(&parent->dev, NULL);
vfio_put_device(&private->vdev);
/*
* Wait for all active references on mdev are released so it
@ -166,6 +164,8 @@ static void vfio_ccw_mdev_remove(struct mdev_device *mdev)
* cycle.
*/
wait_for_completion(&private->release_comp);
vfio_ccw_free_private(private);
}
static int vfio_ccw_mdev_open_device(struct vfio_device *vdev)

2
drivers/s390/cio/vfio_ccw_private.h
View file

@ -134,6 +134,8 @@ int vfio_ccw_sch_quiesce(struct subchannel *sch);
void vfio_ccw_sch_io_todo(struct work_struct *work);
void vfio_ccw_crw_todo(struct work_struct *work);
void vfio_ccw_free_private(struct vfio_ccw_private *private);
extern struct mdev_driver vfio_ccw_mdev_driver;
/*