From: Tony Krowiak <akrowiak@linux.ibm.com>
To: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org
Cc: jjherne@linux.ibm.com, freude@linux.ibm.com,
borntraeger@de.ibm.com, cohuck@redhat.com,
mjrosato@linux.ibm.com, pasic@linux.ibm.com,
alex.williamson@redhat.com, kwankhede@nvidia.com,
fiuczy@linux.ibm.com, Tony Krowiak <akrowiak@linux.ibm.com>
Subject: [PATCH v17 02/15] s390/vfio-ap: use new AP bus interface to search for queue devices
Date: Thu, 21 Oct 2021 11:23:19 -0400 [thread overview]
Message-ID: <20211021152332.70455-3-akrowiak@linux.ibm.com> (raw)
In-Reply-To: <20211021152332.70455-1-akrowiak@linux.ibm.com>
This patch refactors 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.
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_ops.c | 23 +++++++++--------------
1 file changed, 9 insertions(+), 14 deletions(-)
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 02275d246b39..7a9d1b04ecd4 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -28,13 +28,6 @@ static int vfio_ap_mdev_reset_queues(struct ap_matrix_mdev *matrix_mdev);
static struct vfio_ap_queue *vfio_ap_find_queue(int apqn);
static const struct vfio_device_ops vfio_ap_matrix_dev_ops;
-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
@@ -1183,15 +1176,17 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
static struct vfio_ap_queue *vfio_ap_find_queue(int apqn)
{
- struct device *dev;
+ struct ap_queue *queue;
struct vfio_ap_queue *q = NULL;
- dev = driver_find_device(&matrix_dev->vfio_ap_drv->driver, NULL,
- &apqn, match_apqn);
- if (dev) {
- q = dev_get_drvdata(dev);
- put_device(dev);
- }
+ queue = ap_get_qdev(apqn);
+ if (!queue)
+ return NULL;
+
+ if (queue->ap_dev.device.driver == &matrix_dev->vfio_ap_drv->driver)
+ q = dev_get_drvdata(&queue->ap_dev.device);
+
+ put_device(&queue->ap_dev.device);
return q;
}
--
2.31.1
next prev parent reply other threads:[~2021-10-21 15:24 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-21 15:23 [PATCH v17 00/15] s390/vfio-ap: dynamic configuration support Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 01/15] s390/vfio-ap: Set pqap hook when vfio_ap module is loaded Tony Krowiak
2021-12-27 8:21 ` Halil Pasic
2022-01-11 21:13 ` Tony Krowiak
2022-01-04 16:22 ` Jason J. Herne
2022-01-11 17:29 ` Tony Krowiak
2021-10-21 15:23 ` Tony Krowiak [this message]
2021-12-27 8:25 ` [PATCH v17 02/15] s390/vfio-ap: use new AP bus interface to search for queue devices Halil Pasic
2022-01-11 17:32 ` Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 03/15] s390/vfio-ap: move probe and remove callbacks to vfio_ap_ops.c Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 04/15] s390/vfio-ap: manage link between queue struct and matrix mdev Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 05/15] s390/vfio-ap: introduce shadow APCB Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 06/15] s390/vfio-ap: refresh guest's APCB by filtering APQNs assigned to mdev Tony Krowiak
2021-12-27 8:53 ` Halil Pasic
2022-01-11 21:19 ` Tony Krowiak
2022-01-12 11:52 ` Halil Pasic
2022-01-15 0:31 ` Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 07/15] s390/vfio-ap: allow assignment of unavailable AP queues to mdev device Tony Krowiak
2021-12-27 9:06 ` Halil Pasic
2021-10-21 15:23 ` [PATCH v17 08/15] s390/vfio-ap: keep track of active guests Tony Krowiak
2021-12-30 2:04 ` Halil Pasic
2022-01-11 21:27 ` Tony Krowiak
2021-12-30 3:33 ` Halil Pasic
2022-01-11 21:58 ` Tony Krowiak
2022-01-11 22:19 ` Tony Krowiak
2022-01-12 14:25 ` Halil Pasic
2022-01-15 0:29 ` Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 09/15] s390/vfio-ap: allow hot plug/unplug of AP resources using mdev device Tony Krowiak
2022-01-09 21:36 ` Halil Pasic
2022-01-11 22:42 ` Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 10/15] s390/vfio-ap: reset queues after adapter/domain unassignment Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 11/15] s390/ap: driver callback to indicate resource in use Tony Krowiak
2021-11-04 11:27 ` Harald Freudenberger
2021-11-04 15:48 ` Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 12/15] s390/vfio-ap: implement in-use callback for vfio_ap driver Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 13/15] s390/vfio-ap: sysfs attribute to display the guest's matrix Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 14/15] s390/ap: notify drivers on config changed and scan complete callbacks Tony Krowiak
2021-11-04 12:06 ` Harald Freudenberger
2021-11-04 15:50 ` Tony Krowiak
2021-11-05 8:23 ` Harald Freudenberger
2021-11-05 13:15 ` Harald Freudenberger
2021-11-08 14:27 ` Tony Krowiak
2021-11-08 14:26 ` Tony Krowiak
2022-02-04 10:43 ` Halil Pasic
2022-02-07 19:39 ` Tony Krowiak
2022-02-08 1:38 ` Halil Pasic
2022-02-08 3:27 ` Tony Krowiak
2021-10-21 15:23 ` [PATCH v17 15/15] s390/vfio-ap: update docs to include dynamic config support Tony Krowiak
2021-10-27 14:24 ` [PATCH v17 00/15] s390/vfio-ap: dynamic configuration support Tony Krowiak
2021-11-02 19:23 ` Tony Krowiak
2021-11-15 15:45 ` Tony Krowiak
2021-11-22 16:12 ` Tony Krowiak
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