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Date: Tue, 30 Aug 2022 09:43:24 -0400
From: Anthony Krowiak <akrowiak@...ux.ibm.com>
To: Kevin Tian <kevin.tian@...el.com>,
Zhenyu Wang <zhenyuw@...ux.intel.com>,
Zhi Wang <zhi.a.wang@...el.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Eric Farman <farman@...ux.ibm.com>,
Matthew Rosato <mjrosato@...ux.ibm.com>,
Halil Pasic <pasic@...ux.ibm.com>,
Vineeth Vijayan <vneethv@...ux.ibm.com>,
Peter Oberparleiter <oberpar@...ux.ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Jason Herne <jjherne@...ux.ibm.com>,
Harald Freudenberger <freude@...ux.ibm.com>,
Diana Craciun <diana.craciun@....nxp.com>,
Alex Williamson <alex.williamson@...hat.com>,
Cornelia Huck <cohuck@...hat.com>,
Longfang Liu <liulongfang@...wei.com>,
Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
Jason Gunthorpe <jgg@...pe.ca>,
Yishai Hadas <yishaih@...dia.com>,
Eric Auger <eric.auger@...hat.com>,
Kirti Wankhede <kwankhede@...dia.com>,
Leon Romanovsky <leon@...nel.org>,
Abhishek Sahu <abhsahu@...dia.com>,
intel-gvt-dev@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
kvm@...r.kernel.org
Cc: Yi Liu <yi.l.liu@...el.com>
Subject: Re: [PATCH 09/15] vfio/ap: Use the new device life cycle helpers
Reviewed-by: Tony Krowiak <akrowiak@...ux.ibm.com>
On 8/27/22 1:10 PM, Kevin Tian wrote:
> From: Yi Liu <yi.l.liu@...el.com>
>
> and manage available_instances inside @init/@...ease.
>
> Signed-off-by: Yi Liu <yi.l.liu@...el.com>
> Signed-off-by: Kevin Tian <kevin.tian@...el.com>
> ---
> drivers/s390/crypto/vfio_ap_ops.c | 50 ++++++++++++++++++-------------
> 1 file changed, 29 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
> index 6c8c41fac4e1..803aadfd0876 100644
> --- a/drivers/s390/crypto/vfio_ap_ops.c
> +++ b/drivers/s390/crypto/vfio_ap_ops.c
> @@ -684,42 +684,44 @@ static bool vfio_ap_mdev_filter_matrix(unsigned long *apm, unsigned long *aqm,
> AP_DOMAINS);
> }
>
> -static int vfio_ap_mdev_probe(struct mdev_device *mdev)
> +static int vfio_ap_mdev_init_dev(struct vfio_device *vdev)
> {
> - struct ap_matrix_mdev *matrix_mdev;
> - int ret;
> + struct ap_matrix_mdev *matrix_mdev =
> + container_of(vdev, struct ap_matrix_mdev, vdev);
>
> if ((atomic_dec_if_positive(&matrix_dev->available_instances) < 0))
> return -EPERM;
>
> - matrix_mdev = kzalloc(sizeof(*matrix_mdev), GFP_KERNEL);
> - if (!matrix_mdev) {
> - ret = -ENOMEM;
> - goto err_dec_available;
> - }
> - vfio_init_group_dev(&matrix_mdev->vdev, &mdev->dev,
> - &vfio_ap_matrix_dev_ops);
> -
> - matrix_mdev->mdev = mdev;
> + matrix_mdev->mdev = to_mdev_device(vdev->dev);
> vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
> matrix_mdev->pqap_hook = handle_pqap;
> vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb);
> hash_init(matrix_mdev->qtable.queues);
>
> + return 0;
> +}
> +
> +static int vfio_ap_mdev_probe(struct mdev_device *mdev)
> +{
> + struct ap_matrix_mdev *matrix_mdev;
> + int ret;
> +
> + matrix_mdev = vfio_alloc_device(ap_matrix_mdev, vdev, &mdev->dev,
> + &vfio_ap_matrix_dev_ops);
> + if (IS_ERR(matrix_mdev))
> + return PTR_ERR(matrix_mdev);
> +
> ret = vfio_register_emulated_iommu_dev(&matrix_mdev->vdev);
> if (ret)
> - goto err_list;
> + goto err_put_vdev;
> dev_set_drvdata(&mdev->dev, matrix_mdev);
> mutex_lock(&matrix_dev->mdevs_lock);
> list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
> mutex_unlock(&matrix_dev->mdevs_lock);
> return 0;
>
> -err_list:
> - vfio_uninit_group_dev(&matrix_mdev->vdev);
> - kfree(matrix_mdev);
> -err_dec_available:
> - atomic_inc(&matrix_dev->available_instances);
> +err_put_vdev:
> + vfio_put_device(&matrix_mdev->vdev);
> return ret;
> }
>
> @@ -766,6 +768,12 @@ static void vfio_ap_mdev_unlink_fr_queues(struct ap_matrix_mdev *matrix_mdev)
> }
> }
>
> +static void vfio_ap_mdev_release_dev(struct vfio_device *vdev)
> +{
> + vfio_free_device(vdev);
> + atomic_inc(&matrix_dev->available_instances);
> +}
> +
> static void vfio_ap_mdev_remove(struct mdev_device *mdev)
> {
> struct ap_matrix_mdev *matrix_mdev = dev_get_drvdata(&mdev->dev);
> @@ -779,9 +787,7 @@ static void vfio_ap_mdev_remove(struct mdev_device *mdev)
> list_del(&matrix_mdev->node);
> mutex_unlock(&matrix_dev->mdevs_lock);
> mutex_unlock(&matrix_dev->guests_lock);
> - vfio_uninit_group_dev(&matrix_mdev->vdev);
> - kfree(matrix_mdev);
> - atomic_inc(&matrix_dev->available_instances);
> + vfio_put_device(&matrix_mdev->vdev);
> }
>
> static ssize_t name_show(struct mdev_type *mtype,
> @@ -1794,6 +1800,8 @@ static const struct attribute_group vfio_queue_attr_group = {
> };
>
> static const struct vfio_device_ops vfio_ap_matrix_dev_ops = {
> + .init = vfio_ap_mdev_init_dev,
> + .release = vfio_ap_mdev_release_dev,
> .open_device = vfio_ap_mdev_open_device,
> .close_device = vfio_ap_mdev_close_device,
> .ioctl = vfio_ap_mdev_ioctl,
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