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vdpa: Add eventfd for the vdpa callback

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[ Upstream commit 5e68470f4e80a4120e9ecec408f6ab4ad386bd4a ]

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>
Message-Id: <20230323053043.35-9-xieyongji@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Stable-dep-of: 02e9e9366fef ("vhost_vdpa: assign irq bypass producer token correctly")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Xie Yongji 2023-03-23 13:30:40 +08:00 committed by Greg Kroah-Hartman
parent 64add9aaf7
commit 10348fb6fe
3 changed files with 9 additions and 0 deletions
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2
drivers/vhost/vdpa.c
View File

@ -422,9 +422,11 @@ 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);

1
drivers/virtio/virtio_vdpa.c
View File

@ -180,6 +180,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
/* Setup virtqueue callback */
cb.callback = virtio_vdpa_virtqueue_cb;
cb.private = info;
cb.trigger = NULL;
ops->set_vq_cb(vdpa, index, &cb);
ops->set_vq_num(vdpa, index, virtqueue_get_vring_size(vq));

6
include/linux/vdpa.h
View File

@ -11,10 +11,16 @@
* 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;
};
/**