unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

virtio_pci_modern: remove admin queue serialization lock

Browse source 
The admin queue operations are protected by newly introduced
spin lock. To make it possible to issue parallel commands, remove the
admin queue serialization lock.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Message-Id: <20240716113552.80599-14-jiri@resnulli.us>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jiri Pirko 2024-07-16 13:35:52 +02:00 committed by Michael S. Tsirkin
parent 4c3b54af90
commit 6d834691da
2 changed files with 0 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/virtio/virtio_pci_common.h
View file

@ -45,8 +45,6 @@ struct virtio_pci_vq_info {
struct virtio_pci_admin_vq {
/* Virtqueue info associated with this admin queue. */
struct virtio_pci_vq_info *info;
/* serializing admin commands execution. */
struct mutex cmd_lock;
/* Protects virtqueue access. */
spinlock_t lock;
u64 supported_cmds;

5
drivers/virtio/virtio_pci_modern.c
View file

@ -167,12 +167,9 @@ int vp_modern_admin_cmd_exec(struct virtio_device *vdev,
in_num++;
}
mutex_lock(&vp_dev->admin_vq.cmd_lock);
ret = virtqueue_exec_admin_cmd(&vp_dev->admin_vq,
le16_to_cpu(cmd->opcode),
sgs, out_num, in_num, cmd);
mutex_unlock(&vp_dev->admin_vq.cmd_lock);
if (ret) {
dev_err(&vdev->dev,
"Failed to execute command on admin vq: %d\n.", ret);
@ -837,7 +834,6 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
vp_dev->vdev.id = mdev->id;
spin_lock_init(&vp_dev->admin_vq.lock);
mutex_init(&vp_dev->admin_vq.cmd_lock);
return 0;
}
@ -845,6 +841,5 @@ void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev)
{
struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
mutex_destroy(&vp_dev->admin_vq.cmd_lock);
vp_modern_remove(mdev);
}