[PATCH 7/7] vp_vdpa: report doorbell address

Jason Wang
2021-04-15T07:32:36Z

This patch reports the per vq doorbell location and size to vDPA
bus. Userspace can then map the doorbell via mmap() via vhost-vDPA bus
driver.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/vdpa/virtio_pci/vp_vdpa.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c
index 98205e54d089..002b928d0ca1 100644
--- a/drivers/vdpa/virtio_pci/vp_vdpa.c
+++ b/drivers/vdpa/virtio_pci/vp_vdpa.c
@@ -26,6 +26,7 @@ struct vp_vring {
void __iomem *notify;
char msix_name[VP_VDPA_NAME_SIZE];
struct vdpa_callback cb;
+ resource_size_t notify_pa;
int irq;
};

@@ -336,6 +337,19 @@ static void vp_vdpa_set_config_cb(struct vdpa_device *vdpa,
vp_vdpa->config_cb = *cb;
}

+static struct vdpa_notification_area
+vp_vdpa_get_vq_notification(struct vdpa_device *vdpa, u16 qid)
+{
+ struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
+ struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
+ struct vdpa_notification_area notify;
+
+ notify.addr = vp_vdpa->vring[qid].notify_pa;
+ notify.size = mdev->notify_offset_multiplier;
+
+ return notify;
+}
+
static const struct vdpa_config_ops vp_vdpa_ops = {
.get_features = vp_vdpa_get_features,
.set_features = vp_vdpa_set_features,
@@ -343,6 +357,7 @@ static const struct vdpa_config_ops vp_vdpa_ops = {
.set_status = vp_vdpa_set_status,
.get_vq_num_max = vp_vdpa_get_vq_num_max,
.get_vq_state = vp_vdpa_get_vq_state,
+ .get_vq_notification = vp_vdpa_get_vq_notification,
.set_vq_state = vp_vdpa_set_vq_state,
.set_vq_cb = vp_vdpa_set_vq_cb,
.set_vq_ready = vp_vdpa_set_vq_ready,
@@ -416,7 +431,8 @@ static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
for (i = 0; i < vp_vdpa->queues; i++) {
vp_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR;
vp_vdpa->vring[i].notify =
- vp_modern_map_vq_notify(mdev, i, NULL);
+ vp_modern_map_vq_notify(mdev, i,
+ &vp_vdpa->vring[i].notify_pa);
if (!vp_vdpa->vring[i].notify) {
dev_warn(&pdev->dev, "Fail to map vq notify %d\n", i);
goto err;
--
2.18.1