Commit 5e68470f authored by Xie Yongji's avatar Xie Yongji Committed by Michael S. Tsirkin
Browse files

vdpa: Add eventfd for the vdpa callback 



Add eventfd for the vdpa callback so that user
can signal it directly instead of triggering the
callback. It will be used for vhost-vdpa case.

Signed-off-by: default avatarXie Yongji <xieyongji@bytedance.com>
Message-Id: <20230323053043.35-9-xieyongji@bytedance.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
parent 66640f4a

drivers/vhost/vdpa.c

+2 −0
Original line number Diff line number Diff line
@@ -599,9 +599,11 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, 
		if (vq->call_ctx.ctx) {

			cb.callback = vhost_vdpa_virtqueue_cb;

			cb.private = vq;

			cb.trigger = vq->call_ctx.ctx;

		} else {

			cb.callback = NULL;

			cb.private = NULL;

			cb.trigger = NULL;

		}

		ops->set_vq_cb(vdpa, idx, &cb);

		vhost_vdpa_setup_vq_irq(v, idx);

drivers/virtio/virtio_vdpa.c

+1 −0
Original line number Diff line number Diff line
@@ -196,6 +196,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index, 
	/* Setup virtqueue callback */

	cb.callback = callback ? virtio_vdpa_virtqueue_cb : NULL;

	cb.private = info;

	cb.trigger = NULL;

	ops->set_vq_cb(vdpa, index, &cb);

	ops->set_vq_num(vdpa, index, virtqueue_get_vring_size(vq));

include/linux/vdpa.h

+6 −0
Original line number Diff line number Diff line
@@ -13,10 +13,16 @@ 
 * struct vdpa_calllback - vDPA callback definition.

 * @callback: interrupt callback function

 * @private: the data passed to the callback function

 * @trigger: the eventfd for the callback (Optional).

 *           When it is set, the vDPA driver must guarantee that

 *           signaling it is functional equivalent to triggering

 *           the callback. Then vDPA parent can signal it directly

 *           instead of triggering the callback.

 */

struct vdpa_callback {

	irqreturn_t (*callback)(void *data);

	void *private;

	struct eventfd_ctx *trigger;

};



/**