[PATCH RFC v5 net-next 5/6] vhost: let vhost_signal() returns whether signalled
From: Jason Wang <jasowang@redhat.com>
Date: 2015-02-09 08:40:07
Also in:
lkml
Subsystem:
the rest, virtio host (vhost) · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
Let vhost_signal() return whether or not vhost has injected an interrupt to guest. This is used for interrupt coalescing implementation to calculate the interval between two interrupts. Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/vhost/vhost.c | 7 +++++-- drivers/vhost/vhost.h | 2 +- 2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index cb807d0..20d6b84 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c@@ -1480,11 +1480,14 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq) } /* This actually signals the guest, using eventfd. */ -void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq) +bool vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq) { /* Signal the Guest tell them we used something up. */ - if (vq->call_ctx && vhost_notify(dev, vq)) + if (vq->call_ctx && vhost_notify(dev, vq)) { eventfd_signal(vq->call_ctx, 1); + return true; + } + return false; } EXPORT_SYMBOL_GPL(vhost_signal);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 8c1c792..a482563 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h@@ -148,7 +148,7 @@ void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *, unsigned int id, int len); void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *, struct vring_used_elem *heads, unsigned count); -void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *); +bool vhost_signal(struct vhost_dev *, struct vhost_virtqueue *); void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *); bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *);
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1.8.3.1