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| author | Jason Wang <jasowang@redhat.com> | 2021-01-04 14:54:58 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2021-02-23 07:52:58 -0500 |
| commit | 1bfd84134c885799b8ac94766bff600b1f963ecf (patch) | |
| tree | b49ab4ace1ef27cc41152844ef7f13ad74375f8c /drivers/virtio | |
| parent | 6e52fc446d32a82936f05106ffeef5cf8529e6c4 (diff) | |
| download | linux-1bfd84134c885799b8ac94766bff600b1f963ecf.tar.gz linux-1bfd84134c885799b8ac94766bff600b1f963ecf.tar.xz | |
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>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_pci_modern.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index bccad1329871..217573f2588d 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -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; |