Re: [PATCH v4 1/7] s390: vfio-ap: Refactor vfio_ap driver probe and remove callbacks

Harald Freudenberger
2019-06-17T08:27:34Z

On 13.06.19 21:39, Tony Krowiak wrote:
> In order to limit the number of private mdev functions called from the
> vfio_ap device driver as well as to provide a landing spot for dynamic
> configuration code related to binding/unbinding AP queue devices to/from
> the vfio_ap driver, the following changes are being introduced:
>
> * Move code from the vfio_ap driver's probe callback into a function
> defined in the mdev private operations file.
>
> * Move code from the vfio_ap driver's remove callback into a function
> defined in the mdev private operations file.
>
> Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
> ---
> drivers/s390/crypto/vfio_ap_drv.c | 27 ++++++++++-----------------
> drivers/s390/crypto/vfio_ap_ops.c | 28 ++++++++++++++++++++++++++++
> drivers/s390/crypto/vfio_ap_private.h | 6 +++---
> 3 files changed, 41 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
> index 003662aa8060..3c60df70891b 100644
> --- a/drivers/s390/crypto/vfio_ap_drv.c
> +++ b/drivers/s390/crypto/vfio_ap_drv.c
> @@ -49,15 +49,15 @@ MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);
> */
> 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;
> - q->saved_isc = VFIO_AP_ISC_INVALID;
> + int ret;
> + struct ap_queue *queue = to_ap_queue(&apdev->device);
> +
> + ret = vfio_ap_mdev_probe_queue(queue);
> + if (ret)
> + return ret;
> +
> return 0;
A simple
return vfio_ap_mdev_probe_queue(queue);
would be enough.
> +
> }
>
> /**
> @@ -68,17 +68,10 @@ static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
> */
> static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
> {
> - struct vfio_ap_queue *q;
> - int apid, apqi;
> + struct ap_queue *queue = to_ap_queue(&apdev->device);
>
> mutex_lock(&matrix_dev->lock);
> - q = dev_get_drvdata(&apdev->device);
> - dev_set_drvdata(&apdev->device, NULL);
> - apid = AP_QID_CARD(q->apqn);
> - apqi = AP_QID_QUEUE(q->apqn);
> - vfio_ap_mdev_reset_queue(apid, apqi, 1);
> - vfio_ap_irq_disable(q);
> - kfree(q);
> + vfio_ap_mdev_remove_queue(queue);
> mutex_unlock(&matrix_dev->lock);
> }
>
> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
> index 015174ff6f0a..bf2ab02b9a0b 100644
> --- a/drivers/s390/crypto/vfio_ap_ops.c
> +++ b/drivers/s390/crypto/vfio_ap_ops.c
> @@ -1302,3 +1302,31 @@ void vfio_ap_mdev_unregister(void)
> {
> mdev_unregister_device(&matrix_dev->device);
> }
> +
> +int vfio_ap_mdev_probe_queue(struct ap_queue *queue)
> +{
> + struct vfio_ap_queue *q;
> +
> + q = kzalloc(sizeof(*q), GFP_KERNEL);
> + if (!q)
> + return -ENOMEM;
> + dev_set_drvdata(&queue->ap_dev.device, q);
> + q->apqn = queue->qid;
> + q->saved_isc = VFIO_AP_ISC_INVALID;
> +
> + return 0;
> +}
> +
> +void vfio_ap_mdev_remove_queue(struct ap_queue *queue)
> +{
> + struct vfio_ap_queue *q;
> + int apid, apqi;
> +
> + q = dev_get_drvdata(&queue->ap_dev.device);
> + dev_set_drvdata(&queue->ap_dev.device, NULL);
> + apid = AP_QID_CARD(q->apqn);
> + apqi = AP_QID_QUEUE(q->apqn);
> + vfio_ap_mdev_reset_queue(apid, apqi, 1);
> + vfio_ap_irq_disable(q);
> + kfree(q);
> +}
> diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
> index f46dde56b464..5cc3c2ebf151 100644
> --- a/drivers/s390/crypto/vfio_ap_private.h
> +++ b/drivers/s390/crypto/vfio_ap_private.h
> @@ -90,8 +90,6 @@ struct ap_matrix_mdev {
>
> extern int vfio_ap_mdev_register(void);
> extern void vfio_ap_mdev_unregister(void);
> -int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
> - unsigned int retry);
>
> struct vfio_ap_queue {
> struct ap_matrix_mdev *matrix_mdev;
> @@ -100,5 +98,7 @@ struct vfio_ap_queue {
> #define VFIO_AP_ISC_INVALID 0xff
> unsigned char saved_isc;
> };
> -struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q);
> +int vfio_ap_mdev_probe_queue(struct ap_queue *queue);
> +void vfio_ap_mdev_remove_queue(struct ap_queue *queue);
> +
> #endif /* _VFIO_AP_PRIVATE_H_ */