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

Tony Krowiak
2019-06-17T14:24:51Z

On 6/17/19 4:27 AM, Harald Freudenberger wrote:
> 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.

True.

>> +
>> }
>>
>> /**
>> @@ -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_ */
>