linux-kernel - [PATCH] dmaengine: ioat setting ioat timeout as module parameter

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Message-Id: <20200701140849.8828-1-leonid.ravich@dell.com>
Date:   Wed,  1 Jul 2020 17:08:45 +0300
From:   leonid.ravich@...l.com
To:     dmaengine@...r.kernel.org
Cc:     lravich@...il.com, Leonid Ravich <Leonid.Ravich@...l.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Dave Jiang <dave.jiang@...el.com>,
        "Alexander.Barabash@...l.com" <Alexander.Barabash@...l.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] dmaengine: ioat setting ioat timeout as module parameter

From: Leonid Ravich <Leonid.Ravich@....com>

DMA transaction time to complition  is a function of
PCI bandwidth,transaction size and a queue depth.
So hard coded value for timeouts might be wrong
for some scenarios.

Signed-off-by: Leonid Ravich <Leonid.Ravich@....com>
---
 drivers/dma/ioat/dma.c | 12 ++++++++++++
 drivers/dma/ioat/dma.h |  2 --
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 8ad0ad861c86..7621b5be5cf4 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -26,6 +26,18 @@
 
 #include "../dmaengine.h"
 
+int complition_timeout = 200;
+module_param(complition_timeout, int, 0644);
+MODULE_PARM_DESC(complition_timeout,
+		"set ioat complition timeout [msec] (default 200 [msec])");
+int idle_timeout = 2000;
+module_param(idle_timeout, int, 0644);
+MODULE_PARM_DESC(idle_timeout,
+		"set ioat idel timeout [msec] (default 2000 [msec])");
+
+#define IDLE_TIMEOUT msecs_to_jiffies(idle_timeout)
+#define COMPLETION_TIMEOUT msecs_to_jiffies(complition_timeout)
+
 static char *chanerr_str[] = {
 	"DMA Transfer Source Address Error",
 	"DMA Transfer Destination Address Error",
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index e6b622e1ba92..f7f31fdf14cf 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -104,8 +104,6 @@ struct ioatdma_chan {
 	#define IOAT_RUN 5
 	#define IOAT_CHAN_ACTIVE 6
 	struct timer_list timer;
-	#define COMPLETION_TIMEOUT msecs_to_jiffies(100)
-	#define IDLE_TIMEOUT msecs_to_jiffies(2000)
 	#define RESET_DELAY msecs_to_jiffies(100)
 	struct ioatdma_device *ioat_dma;
 	dma_addr_t completion_dma;
-- 
2.16.2