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| author | Jason Wang <jasowang@redhat.com> | 2021-01-04 09:54:56 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2021-02-23 15:52:58 +0300 |
| commit | 75658afbab57706c241ca7d60559ebefd631fc6f (patch) | |
| tree | 7c6ba4bda4e15bc91659f52435811ec6fe48abf8 /drivers/virtio | |
| parent | dc2e64819837ba927f2811d8ac95a027d931764d (diff) | |
| download | linux-75658afbab57706c241ca7d60559ebefd631fc6f.tar.xz | |
virtio-pci-modern: introduce helper for setting/geting queue size
This patch introduces helper for setting/getting queue size for modern
device.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210104065503.199631-13-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 | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index 0e62820b83ff..7a89226135af 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -262,6 +262,36 @@ static bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev, return vp_ioread16(&mdev->common->queue_enable); } +/* + * vp_modern_set_queue_size - set size for a virtqueue + * @mdev: the modern virtio-pci device + * @index: the queue index + * @size: the size of the virtqueue + */ +static void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev, + u16 index, u16 size) +{ + vp_iowrite16(index, &mdev->common->queue_select); + vp_iowrite16(size, &mdev->common->queue_size); + +} + +/* + * vp_modern_get_queue_size - get size for a virtqueue + * @mdev: the modern virtio-pci device + * @index: the queue index + * + * Returns the size of the virtqueue + */ +static u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev, + u16 index) +{ + vp_iowrite16(index, &mdev->common->queue_select); + + return vp_ioread16(&mdev->common->queue_size); + +} + /* virtio config->finalize_features() implementation */ static int vp_finalize_features(struct virtio_device *vdev) { @@ -487,7 +517,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, vp_iowrite16(index, &cfg->queue_select); /* Check if queue is either not available or already active. */ - num = vp_ioread16(&cfg->queue_size); + num = vp_modern_get_queue_size(mdev, index); if (!num || vp_modern_get_queue_enable(mdev, index)) return ERR_PTR(-ENOENT); @@ -510,7 +540,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, return ERR_PTR(-ENOMEM); /* activate the queue */ - vp_iowrite16(virtqueue_get_vring_size(vq), &cfg->queue_size); + vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq)); vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq), virtqueue_get_avail_addr(vq), virtqueue_get_used_addr(vq)); |