netdev - [PATCH 2/2] vhost_vdpa: unified set_vq_irq() and update_vq

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Date:   Wed,  5 Aug 2020 19:38:32 +0800
From:   Zhu Lingshan <lingshan.zhu@...el.com>
To:     jasowang@...hat.com, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, eli@...lanox.com, shahafs@...lanox.com,
        parav@...lanox.com, Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [PATCH 2/2] vhost_vdpa: unified set_vq_irq() and update_vq_irq()

This commit merge vhost_vdpa_update_vq_irq() logics into
vhost_vdpa_setup_vq_irq(), so that code are unified.

In vhost_vdpa_setup_vq_irq(), added checks for the existence
for get_vq_irq().

Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
---
 drivers/vhost/vdpa.c | 28 ++++++----------------------
 1 file changed, 6 insertions(+), 22 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 26f166a8192e..044e1f54582a 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -122,8 +122,12 @@ static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
 	struct vdpa_device *vdpa = v->vdpa;
 	int ret, irq;
 
-	spin_lock(&vq->call_ctx.ctx_lock);
+	if (!ops->get_vq_irq)
+		return;
+
 	irq = ops->get_vq_irq(vdpa, qid);
+	spin_lock(&vq->call_ctx.ctx_lock);
+	irq_bypass_unregister_producer(&vq->call_ctx.producer);
 	if (!vq->call_ctx.ctx || irq < 0) {
 		spin_unlock(&vq->call_ctx.ctx_lock);
 		return;
@@ -144,26 +148,6 @@ static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid)
 	spin_unlock(&vq->call_ctx.ctx_lock);
 }
 
-static void vhost_vdpa_update_vq_irq(struct vhost_virtqueue *vq)
-{
-	spin_lock(&vq->call_ctx.ctx_lock);
-	/*
-	 * if it has a non-zero irq, means there is a
-	 * previsouly registered irq_bypass_producer,
-	 * we should update it when ctx (its token)
-	 * changes.
-	 */
-	if (!vq->call_ctx.producer.irq) {
-		spin_unlock(&vq->call_ctx.ctx_lock);
-		return;
-	}
-
-	irq_bypass_unregister_producer(&vq->call_ctx.producer);
-	vq->call_ctx.producer.token = vq->call_ctx.ctx;
-	irq_bypass_register_producer(&vq->call_ctx.producer);
-	spin_unlock(&vq->call_ctx.ctx_lock);
-}
-
 static void vhost_vdpa_reset(struct vhost_vdpa *v)
 {
 	struct vdpa_device *vdpa = v->vdpa;
@@ -452,7 +436,7 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
 			cb.private = NULL;
 		}
 		ops->set_vq_cb(vdpa, idx, &cb);
-		vhost_vdpa_update_vq_irq(vq);
+		vhost_vdpa_setup_vq_irq(v, idx);
 		break;
 
 	case VHOST_SET_VRING_NUM:
-- 
2.18.4