在 2023/3/23 13:30, Xie Yongji 写道:
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@xxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx> Thanks
--- 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.hindex 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; };/**
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