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authorJason Wang <jasowang@redhat.com>2021-01-04 07:54:56 +0100
committerMichael S. Tsirkin <mst@redhat.com>2021-02-23 13:52:58 +0100
commit75658afbab57706c241ca7d60559ebefd631fc6f (patch)
tree7c6ba4bda4e15bc91659f52435811ec6fe48abf8 /drivers/virtio/virtio_pci_modern.c
parentvirtio-pci-modern: introduce helper to set/get queue_enable (diff)
downloadlinux-75658afbab57706c241ca7d60559ebefd631fc6f.tar.xz
linux-75658afbab57706c241ca7d60559ebefd631fc6f.zip
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 '')
-rw-r--r--drivers/virtio/virtio_pci_modern.c34
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));