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Subject[PATCH v4 08/11] vdpa: Add eventfd for the vdpa callback
Date
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: Xie Yongji <xieyongji@bytedance.com>
---
drivers/vhost/vdpa.c | 2 ++
drivers/virtio/virtio_vdpa.c | 1 +
include/linux/vdpa.h | 6 ++++++
3 files changed, 9 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 7be9d9d8f01c..9cd878e25cff 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -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);
diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index f3826f42b704..2a095f37f26b 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -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));

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index e52c9a37999c..0372b2e3d38a 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -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;
};

/**
--
2.20.1
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