From 526cb8580bc6b9e5bc14cc5d24ecf4633a84cfa1 Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Thu, 15 Apr 2021 03:31:47 -0400 Subject: [PATCH] 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: Jason Wang Link: https://lore.kernel.org/r/20210415073147.19331-8-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin Reviewed-by: Eli Cohen --- 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 98205e5..002b928 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; -- 2.7.4