From 034921cdea1c4c491735c8eb344634c7b899d930 Mon Sep 17 00:00:00 2001 From: Tony Krowiak Date: Thu, 28 Jan 2021 15:53:07 -0500 Subject: [PATCH] s390/vfio-ap: use new AP bus interface to search for queue devices 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 Reviewed-by: Halil Pasic Reviewed-by: Jason J. Herne Signed-off-by: Alexander Gordeev --- 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 a7d2a95..634e23a 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -30,13 +30,6 @@ 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 @@ -1286,15 +1279,17 @@ static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev) 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; } -- 2.7.4