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From: Keith Busch <kbusch@kernel.org>
To: linux-nvme@lists.infradead.org, hch@lst.de, sagi@grimberg.me
Cc: Keith Busch <kbusch@kernel.org>,
	bigeasy@linutronix.de, helgaas@kernel.org, ming.lei@redhat.com
Subject: [PATCH 4/4] nvme/pci: Spin threaded interrupt completions
Date: Thu, 28 Nov 2019 02:58:24 +0900
Message-ID: <20191127175824.1929-5-kbusch@kernel.org> (raw)
In-Reply-To: <20191127175824.1929-1-kbusch@kernel.org>

For deeply queued workloads, the nvme controller may be posting
new completions while the threaded interrupt handles previous
completions. Since the interrupts are masked, we can spin for these
completions for as long as new completions are being posted.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 drivers/nvme/host/pci.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 571b33b69c5f..9ec0933eb120 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1042,9 +1042,15 @@ static irqreturn_t nvme_irq(int irq, void *data)
 	return ret;
 }
 
+static void nvme_irq_spin(int irq, void *data)
+{
+	while (nvme_irq(irq, data) != IRQ_NONE)
+		cond_resched();
+}
+
 static irqreturn_t nvme_irq_thread(int irq, void *data)
 {
-	nvme_irq(irq, data);
+	nvme_irq_spin(irq, data);
 	__pci_msix_desc_mask_irq(irq_get_msi_desc(irq), 0);
 	return IRQ_HANDLED;
 }
@@ -1065,7 +1071,7 @@ static irqreturn_t nvme_irq_thread_msi(int irq, void *data)
 	struct nvme_queue *nvmeq = data;
 	struct nvme_dev *dev = nvmeq->dev;
 
-	nvme_irq(irq, data);
+	nvme_irq_spin(irq, data);
 	writel(1 << nvmeq->cq_vector, dev->bar + NVME_REG_INTMC);
 	return IRQ_HANDLED;
 }
-- 
2.21.0


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Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27 17:58 [PATCH 0/4] nvme: Threaded interrupt handling improvements Keith Busch
2019-11-27 17:58 ` [PATCH 1/4] PCI/MSI: Export __pci_msix_desc_mask_irq Keith Busch
2019-11-28  2:42   ` Sagi Grimberg
2019-11-28  3:41     ` Keith Busch
2019-11-28  7:17   ` Christoph Hellwig
2019-11-27 17:58 ` [PATCH 2/4] nvme/pci: Mask legacy and MSI in threaded handler Keith Busch
2019-11-28  3:39   ` Ming Lei
2019-11-28  3:48     ` Keith Busch
2019-11-28  3:58       ` Ming Lei
2019-11-28  4:14         ` Keith Busch
2019-11-28  8:41           ` Ming Lei
2019-11-27 17:58 ` [PATCH 3/4] nvme/pci: Mask MSIx interrupts for threaded handling Keith Busch
2019-11-28  7:19   ` Christoph Hellwig
2019-11-27 17:58 ` Keith Busch [this message]
2019-11-28  2:46   ` [PATCH 4/4] nvme/pci: Spin threaded interrupt completions Sagi Grimberg
2019-11-28  3:28     ` Keith Busch
2019-11-28  3:51       ` Ming Lei
2019-11-28  3:58         ` Keith Busch
2019-11-28  7:22   ` Christoph Hellwig
2019-11-29  9:13   ` Sebastian Andrzej Siewior
2019-11-30 18:10     ` Keith Busch
2019-12-02  1:10       ` Ming Lei
2019-12-02  1:30         ` Keith Busch
2019-12-02 16:51       ` Sebastian Andrzej Siewior
2019-11-28  7:50 ` [PATCH 0/4] nvme: Threaded interrupt handling improvements Christoph Hellwig
2019-11-28 17:59   ` Keith Busch
2019-11-29  8:30     ` Christoph Hellwig
2019-11-29  9:46 ` Sebastian Andrzej Siewior
2019-11-29 16:27   ` Keith Busch
2019-11-29 17:05     ` Sebastian Andrzej Siewior
2019-11-30 17:02       ` Keith Busch
2019-12-02 17:05         ` Sebastian Andrzej Siewior
2019-12-02 17:12           ` Christoph Hellwig
2019-12-02 18:06             ` Keith Busch
2019-12-03  7:40               ` Christoph Hellwig
2019-12-02 19:57             ` Sebastian Andrzej Siewior
2019-12-03  7:42               ` Christoph Hellwig

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