[PATCH 8/9] vhost: add vhost_dev pointer to vhost_work

Mike Christie
Tue, 25 May 2021 18:05:59 -0000

The next patch allows a vhost_worker to handle different devices. To
prepare for that, this patch adds a pointer to the device on the work so
we can get to the different mms in the vhost_worker thread.

Signed-off-by: Mike Christie <michael.christie at oracle.com>
---
 drivers/vhost/scsi.c  |  7 ++++---
 drivers/vhost/vhost.c | 24 ++++++++++++++----------
 drivers/vhost/vhost.h |  4 +++-
 drivers/vhost/vsock.c |  3 ++-
 4 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index b607bff41074..073b20bca257 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -1808,7 +1808,7 @@ static int vhost_scsi_open(struct inode *inode, struct
file *f)
 	if (!vqs)
 		goto err_vqs;

-	vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
+	vhost_work_init(&vs->dev, &vs->vs_event_work,
vhost_scsi_evt_work);

 	vs->vs_events_nr = 0;
 	vs->vs_events_missed = false;
@@ -1823,7 +1823,7 @@ static int vhost_scsi_open(struct inode *inode, struct
file *f)
 		vqs[i] = &svq->vq;
 		svq->vs = vs;
 		init_llist_head(&svq->completion_list);
-		vhost_work_init(&svq->completion_work,
+		vhost_work_init(&vs->dev, &svq->completion_work,
 				vhost_scsi_complete_cmd_work);
 		svq->vq.handle_kick = vhost_scsi_handle_kick;
 	}
@@ -2017,7 +2017,8 @@ static int vhost_scsi_port_link(struct se_portal_group
*se_tpg,
 	if (!tmf)
 		return -ENOMEM;
 	INIT_LIST_HEAD(&tmf->queue_entry);
-	vhost_work_init(&tmf->vwork, vhost_scsi_tmf_resp_work);
+	vhost_work_init(&tpg->vhost_scsi->dev, &tmf->vwork,
+			vhost_scsi_tmf_resp_work);

 	mutex_lock(&vhost_scsi_mutex);

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 981e9bac7a31..eb16eb2bbee0 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -182,10 +182,12 @@ static int vhost_poll_wakeup(wait_queue_entry_t *wait,
unsigned mode, int sync,
 	return 0;
 }

-void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn)
+void vhost_work_init(struct vhost_dev *dev, struct vhost_work *work,
+		     vhost_work_fn_t fn)
 {
 	clear_bit(VHOST_WORK_QUEUED, &work->flags);
 	work->fn = fn;
+	work->dev = dev;
 }
 EXPORT_SYMBOL_GPL(vhost_work_init);

@@ -201,7 +203,7 @@ void vhost_poll_init(struct vhost_poll *poll,
vhost_work_fn_t fn,
 	poll->wqh = NULL;
 	poll->vq = vq;

-	vhost_work_init(&poll->work, fn);
+	vhost_work_init(dev, &poll->work, fn);
 }
 EXPORT_SYMBOL_GPL(vhost_poll_init);

@@ -270,12 +272,13 @@ void vhost_work_queue(struct vhost_dev *dev, struct
vhost_work *work)
 }
 EXPORT_SYMBOL_GPL(vhost_work_queue);

-static void vhost_work_dev_flush_on(struct vhost_worker *worker)
+static void vhost_work_dev_flush_on(struct vhost_dev *dev,
+				    struct vhost_worker *worker)
 {
 	struct vhost_flush_struct flush;

 	init_completion(&flush.wait_event);
-	vhost_work_init(&flush.work, vhost_flush_work);
+	vhost_work_init(dev, &flush.work, vhost_flush_work);

 	vhost_work_queue_on(&flush.work, worker);
 	wait_for_completion(&flush.wait_event);
@@ -286,7 +289,7 @@ void vhost_work_dev_flush(struct vhost_dev *dev)
 	int i;

 	for (i = 0; i < dev->num_workers; i++)
-		vhost_work_dev_flush_on(dev->workers[i]);
+		vhost_work_dev_flush_on(dev, dev->workers[i]);
 }
 EXPORT_SYMBOL_GPL(vhost_work_dev_flush);

@@ -306,7 +309,7 @@ EXPORT_SYMBOL_GPL(vhost_has_work);

 void vhost_vq_work_flush(struct vhost_virtqueue *vq)
 {
-	vhost_work_dev_flush_on(vq->worker);
+	vhost_work_dev_flush_on(vq->dev, vq->worker);
 }
 EXPORT_SYMBOL_GPL(vhost_vq_work_flush);

@@ -573,14 +576,15 @@ static void vhost_attach_cgroups_work(struct vhost_work
*work)
 	s->ret = cgroup_attach_task_all(s->owner, current);
 }

-static int vhost_attach_cgroups_on(struct vhost_worker *worker)
+static int vhost_attach_cgroups_on(struct vhost_dev *dev,
+				   struct vhost_worker *worker)
 {
 	struct vhost_attach_cgroups_struct attach;

 	attach.owner = current;
-	vhost_work_init(&attach.work, vhost_attach_cgroups_work);
+	vhost_work_init(dev, &attach.work, vhost_attach_cgroups_work);
 	vhost_work_queue_on(&attach.work, worker);
-	vhost_work_dev_flush_on(worker);
+	vhost_work_dev_flush_on(dev, worker);
 	return attach.ret;
 }

@@ -675,7 +679,7 @@ static struct vhost_worker *vhost_worker_create(struct
vhost_dev *dev)
 	worker->task = task;
 	wake_up_process(task); /* avoid contributing to loadavg */

-	ret = vhost_attach_cgroups_on(worker);
+	ret = vhost_attach_cgroups_on(dev, worker);
 	if (ret)
 		goto stop_worker;

diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 75b884ad1f17..75ad3aa5adca 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -24,6 +24,7 @@ struct vhost_work {
 	struct llist_node	node;
 	vhost_work_fn_t		fn;
 	unsigned long		flags;
+	struct vhost_dev	*dev;
 };

 struct vhost_worker {
@@ -47,7 +48,8 @@ struct vhost_poll {
 	struct vhost_virtqueue	*vq;
 };

-void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
+void vhost_work_init(struct vhost_dev *dev, struct vhost_work *work,
+		     vhost_work_fn_t fn);
 void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work);
 bool vhost_has_work(struct vhost_dev *dev);
 void vhost_vq_work_flush(struct vhost_virtqueue *vq);
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index f954f4d29c95..302415b6460b 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -648,7 +648,8 @@ static int vhost_vsock_dev_open(struct inode *inode, struct
file *file)
 	file->private_data = vsock;
 	spin_lock_init(&vsock->send_pkt_list_lock);
 	INIT_LIST_HEAD(&vsock->send_pkt_list);
-	vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work);
+	vhost_work_init(&vsock->dev, &vsock->send_pkt_work,
+			vhost_transport_send_pkt_work);
 	return 0;

 out:
--
2.25.1