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Message-ID: <34208b94-8f37-e46b-3783-9a788c93fb02@linux.ibm.com>
Date: Mon, 27 Jul 2020 09:42:03 -0400
From: Tony Krowiak <akrowiak@...ux.ibm.com>
To: Pierre Morel <pmorel@...ux.ibm.com>, linux-s390@...r.kernel.org,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: freude@...ux.ibm.com, borntraeger@...ibm.com, cohuck@...hat.com,
mjrosato@...ux.ibm.com, pasic@...ux.ibm.com,
alex.williamson@...hat.com, kwankhede@...dia.com,
fiuczy@...ux.ibm.com, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v9 02/15] s390/vfio-ap: use new AP bus interface to search
for queue devices
On 7/24/20 4:38 AM, Pierre Morel wrote:
>
>
> On 2020-07-20 17:03, Tony Krowiak wrote:
>> This patch refactor's the vfio_ap device driver to use the AP bus's
>> ap_get_qdev() function to retrieve the vfio_ap_queue struct containing
>> information about a queue that is bound to the vfio_ap device driver.
>> The bus's ap_get_qdev() function retrieves the queue device from a
>> hashtable keyed by APQN. This is much more efficient than looping over
>> the list of devices attached to the AP bus by several orders of
>> magnitude.
>
> The patch does much more than modifying this line. ;)
Yes it does, I'll be sure to include the additional details.
>
>>
>> Signed-off-by: Tony Krowiak <akrowiak@...ux.ibm.com>
>> Reported-by: kernel test robot <lkp@...el.com>
>> ---
>> drivers/s390/crypto/vfio_ap_drv.c | 27 ++-------
>> drivers/s390/crypto/vfio_ap_ops.c | 86 +++++++++++++++------------
>> drivers/s390/crypto/vfio_ap_private.h | 8 ++-
>> 3 files changed, 59 insertions(+), 62 deletions(-)
>>
>> diff --git a/drivers/s390/crypto/vfio_ap_drv.c
>> b/drivers/s390/crypto/vfio_ap_drv.c
>> index f4ceb380dd61..24cdef60039a 100644
>> --- a/drivers/s390/crypto/vfio_ap_drv.c
>> +++ b/drivers/s390/crypto/vfio_ap_drv.c
>> @@ -53,15 +53,9 @@ 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;
>> - return 0;
>> + struct ap_queue *queue = to_ap_queue(&apdev->device);
>> +
>> + return vfio_ap_mdev_probe_queue(queue);
>> }
>
> You should explain the reason why this function is modified.
>
>> /**
>> @@ -72,18 +66,9 @@ 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;
>> -
>> - 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);
>> - mutex_unlock(&matrix_dev->lock);
>> + struct ap_queue *queue = to_ap_queue(&apdev->device);
>> +
>> + vfio_ap_mdev_remove_queue(queue);
>> }
>
> ... and this one?
>
>> static void vfio_ap_matrix_dev_release(struct device *dev)
>> diff --git a/drivers/s390/crypto/vfio_ap_ops.c
>> b/drivers/s390/crypto/vfio_ap_ops.c
>> index e0bde8518745..ad3925f04f61 100644
>> --- a/drivers/s390/crypto/vfio_ap_ops.c
>> +++ b/drivers/s390/crypto/vfio_ap_ops.c
>> @@ -26,43 +26,26 @@
>> static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev);
>> -static int match_apqn(struct device *dev, const void *data)
>> -{
>> - struct vfio_ap_queue *q = dev_get_drvdata(dev);
>> -
>> - return (q->apqn == *(int *)(data)) ? 1 : 0;
>> -}
>> -
>> /**
>> - * vfio_ap_get_queue: Retrieve a queue with a specific APQN from a list
>> - * @matrix_mdev: the associated mediated matrix
>> + * vfio_ap_get_queue: Retrieve a queue with a specific APQN.
>> * @apqn: The queue APQN
>> *
>> - * Retrieve a queue with a specific APQN from the list of the
>> - * devices of the vfio_ap_drv.
>> - * Verify that the APID and the APQI are set in the matrix.
>> + * Retrieve a queue with a specific APQN from the AP queue devices
>> attached to
>> + * the AP bus.
>> *
>> - * Returns the pointer to the associated vfio_ap_queue
>> + * Returns the pointer to the vfio_ap_queue with the specified APQN,
>> or NULL.
>> */
>> -static struct vfio_ap_queue *vfio_ap_get_queue(
>> - struct ap_matrix_mdev *matrix_mdev,
>> - int apqn)
>> +static struct vfio_ap_queue *vfio_ap_get_queue(unsigned long apqn)
>> {
>> + struct ap_queue *queue;
>> struct vfio_ap_queue *q;
>> - struct device *dev;
>> - if (!test_bit_inv(AP_QID_CARD(apqn), matrix_mdev->matrix.apm))
>> - return NULL;
>> - if (!test_bit_inv(AP_QID_QUEUE(apqn), matrix_mdev->matrix.aqm))
>> + queue = ap_get_qdev(apqn);
>> + if (!queue)
>> return NULL;
>> - dev = driver_find_device(&matrix_dev->vfio_ap_drv->driver, NULL,
>> - &apqn, match_apqn);
>> - if (!dev)
>> - return NULL;
>> - q = dev_get_drvdata(dev);
>> - q->matrix_mdev = matrix_mdev;
>> - put_device(dev);
>> + q = dev_get_drvdata(&queue->ap_dev.device);
>> + put_device(&queue->ap_dev.device);
>> return q;
>> }
>
> this function changed a lot too, you should explain the goal in the
> patch comment.
>
> ...snip...
>
> Regards,
> Pierre
>
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