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Subject[PATCH V2 14/19] virtio-pci-modern: introduce helper to get notification offset
Date
This patch introduces help to get notification offset of modern device.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/virtio/virtio_pci_modern.c | 21 ++++++++++++++++-----
1 file 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;

--
2.25.1
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