IB/hfi1: Reduce lock contention on iowait_lock for sdma and pio

Commit 4e045572e2c2 ("IB/hfi1: Add unique txwait_lock for txreq events")
laid the ground work to support per resource waiting locking.

This patch adds that with a lock unique to each sdma engine and pio
sendcontext and makes necessary changes for verbs, PSM, and vnic to use
the new locks.

This is particularly beneficial for smaller messages that will exhaust
resources at a faster rate.

Fixes: 7724105686e7 ("IB/hfi1: add driver files")
Reviewed-by: Gary Leshner <Gary.S.Leshner@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 8 insertions, 12 deletions

diff --git a/drivers/infiniband/hw/hfi1/qp.c b/drivers/infiniband/hw/hfi1/qp.c
index 6f3bc4dab858..e32fbfe029bc 100644
--- a/drivers/infiniband/hw/hfi1/qp.c
+++ b/drivers/infiniband/hw/hfi1/qp.c
@@ -368,20 +368,18 @@ bool _hfi1_schedule_send(struct rvt_qp *qp)
 
 static void qp_pio_drain(struct rvt_qp *qp)
 {
-	struct hfi1_ibdev *dev;
 	struct hfi1_qp_priv *priv = qp->priv;
 
 	if (!priv->s_sendcontext)
 		return;
-	dev = to_idev(qp->ibqp.device);
 	while (iowait_pio_pending(&priv->s_iowait)) {
-		write_seqlock_irq(&dev->iowait_lock);
+		write_seqlock_irq(&priv->s_sendcontext->waitlock);
 		hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 1);
-		write_sequnlock_irq(&dev->iowait_lock);
+		write_sequnlock_irq(&priv->s_sendcontext->waitlock);
 		iowait_pio_drain(&priv->s_iowait);
-		write_seqlock_irq(&dev->iowait_lock);
+		write_seqlock_irq(&priv->s_sendcontext->waitlock);
 		hfi1_sc_wantpiobuf_intr(priv->s_sendcontext, 0);
-		write_sequnlock_irq(&dev->iowait_lock);
+		write_sequnlock_irq(&priv->s_sendcontext->waitlock);
 	}
 }
 
@@ -452,7 +450,6 @@ static int iowait_sleep(
 	struct hfi1_qp_priv *priv;
 	unsigned long flags;
 	int ret = 0;
-	struct hfi1_ibdev *dev;
 
 	qp = tx->qp;
 	priv = qp->priv;
@@ -465,9 +462,8 @@ static int iowait_sleep(
 		 * buffer and undoing the side effects of the copy.
 		 */
 		/* Make a common routine? */
-		dev = &sde->dd->verbs_dev;
 		list_add_tail(&stx->list, &wait->tx_head);
-		write_seqlock(&dev->iowait_lock);
+		write_seqlock(&sde->waitlock);
 		if (sdma_progress(sde, seq, stx))
 			goto eagain;
 		if (list_empty(&priv->s_iowait.list)) {
@@ -478,11 +474,11 @@ static int iowait_sleep(
 			qp->s_flags |= RVT_S_WAIT_DMA_DESC;
 			iowait_queue(pkts_sent, &priv->s_iowait,
 				     &sde->dmawait);
-			priv->s_iowait.lock = &dev->iowait_lock;
+			priv->s_iowait.lock = &sde->waitlock;
 			trace_hfi1_qpsleep(qp, RVT_S_WAIT_DMA_DESC);
 			rvt_get_qp(qp);
 		}
-		write_sequnlock(&dev->iowait_lock);
+		write_sequnlock(&sde->waitlock);
 		hfi1_qp_unbusy(qp, wait);
 		spin_unlock_irqrestore(&qp->s_lock, flags);
 		ret = -EBUSY;
@@ -492,7 +488,7 @@ static int iowait_sleep(
 	}
 	return ret;
 eagain:
-	write_sequnlock(&dev->iowait_lock);
+	write_sequnlock(&sde->waitlock);
 	spin_unlock_irqrestore(&qp->s_lock, flags);
 	list_del_init(&stx->list);
 	return -EAGAIN;