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virtio-pci-modern: introduce helper to get notification offset 

This patch introduces help to get notification offset of modern device.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210104065503.199631-15-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2021-01-04 14:54:58 +08:00 committed by Michael S. Tsirkin
parent 6e52fc446d
commit 1bfd84134c
1 changed files with 16 additions and 5 deletions
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21
drivers/virtio/virtio_pci_modern.c
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@ -303,6 +303,21 @@ static u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev)
return vp_ioread16(&mdev->common->num_queues);
}
/*
* vp_modern_get_queue_notify_off - get notification offset for a virtqueue
* @mdev: the modern virtio-pci device
* @index: the queue index
*
* Returns the notification offset for a virtqueue
*/
static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
u16 index)
{
vp_iowrite16(index, &mdev->common->queue_select);
return vp_ioread16(&mdev->common->queue_notify_off);
}
/* virtio config->finalize_features() implementation */
static int vp_finalize_features(struct virtio_device *vdev)
{
@ -516,7 +531,6 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
{
struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
struct virtqueue *vq;
u16 num, off;
int err;
@ -524,9 +538,6 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
if (index >= vp_modern_get_num_queues(mdev))
return ERR_PTR(-ENOENT);
/* Select the queue we're interested in */
vp_iowrite16(index, &cfg->queue_select);
/* Check if queue is either not available or already active. */
num = vp_modern_get_queue_size(mdev, index);
if (!num || vp_modern_get_queue_enable(mdev, index))
@ -538,7 +549,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
}
/* get offset of notification word for this vq */
off = vp_ioread16(&cfg->queue_notify_off);
off = vp_modern_get_queue_notify_off(mdev, index);
info->msix_vector = msix_vec;