Commit 526cb858 authored by Jason Wang's avatar Jason Wang Committed by Michael S. Tsirkin
Browse files

vp_vdpa: report doorbell address 



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: default avatarJason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210415073147.19331-8-jasowang@redhat.com


Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: default avatarEli Cohen <elic@nvidia.com>
parent 9e311bca

drivers/vdpa/virtio_pci/vp_vdpa.c

+17 −1
Original line number Diff line number Diff line
@@ -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;