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vp_vdpa: report doorbell address

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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>
Link: https://lore.kernel.org/r/20210415073147.19331-8-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
This commit is contained in:
Jason Wang 2021-04-15 03:31:47 -04:00 committed by Michael S. Tsirkin
parent 9e311bcad7
commit 526cb8580b
1 changed files with 17 additions and 1 deletions
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18
drivers/vdpa/virtio_pci/vp_vdpa.c
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@ -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;