[PATCH v3 3/9] s390: ap: new vfio_ap_queue structure

Pierre Morel
2019-02-14T13:52:19Z

The AP interruptions are assigned on a queue basis
and we need some information neloging to the queue
to handle interuptions.

We add a new structure vfio_ap_queue, to hold per
queue information useful to handle interruptions.

- apqn: AP queue number (defined here)
- isc : Interrupt subclass (defined later)
- nib : notification information byte (defined later)

The vfio_ap_queue structure is allocated when the vfio_ap_driver
is probed and added as driver data to the ap_queue device.
It is free on remove.

The structure is linked to the matrix_dev host device.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_drv.c | 23 ++++++++++++++++++++++-
drivers/s390/crypto/vfio_ap_private.h | 3 +++
2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
index 1fd5fe6..03153e6 100644
--- a/drivers/s390/crypto/vfio_ap_drv.c
+++ b/drivers/s390/crypto/vfio_ap_drv.c
@@ -46,14 +46,35 @@ static struct ap_device_id ap_queue_ids[] = {

MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);

+/**
+ * vfio_ap_queue_dev_probe:
+ *
+ * Allocate a vfio_ap_queue structure and associate it
+ * with the device as driver_data.
+ */
static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
{
+ struct vfio_ap_queue *q;
+
+ q = kzalloc(sizeof(*q), GFP_KERNEL);
+ if (!q)
+ return -ENOMEM;
+ dev_set_drvdata(&apdev->device, q);
+ q->apqn = to_ap_queue(&apdev->device)->qid;
return 0;
}

+/**
+ * vfio_ap_queue_dev_remove:
+ *
+ * Free the associated vfio_ap_queue structure
+ */
static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
{
- /* Nothing to do yet */
+ struct vfio_ap_queue *q;
+
+ q = dev_get_drvdata(&apdev->device);
+ kfree(q);
}

static void vfio_ap_matrix_dev_release(struct device *dev)
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index 76b7f98..8836f01 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -86,4 +86,7 @@ struct ap_matrix_mdev {
extern int vfio_ap_mdev_register(void);
extern void vfio_ap_mdev_unregister(void);

+struct vfio_ap_queue {
+ int apqn;
+};
#endif /* _VFIO_AP_PRIVATE_H_ */
--
2.7.4