dmaengine: ioat setting ioat timeout as module parameter

BugLink: https://bugs.launchpad.net/bugs/1889669
[ Upstream commit 87730ccbddcb48478b1b88e88b14e73424130764 ]

DMA transaction time to completion 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@emc.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20200701184816.29138-1-leonid.ravich@dell.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 18c011e57592ebc838a30d118b7465d8c8a09a46..8e2a4d1f0be53363ba773847c7ed4cda18202ecf 100644 (file)
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -26,6 +26,18 @@
 
 #include "../dmaengine.h"
 
+int completion_timeout = 200;
+module_param(completion_timeout, int, 0644);
+MODULE_PARM_DESC(completion_timeout,
+               "set ioat completion 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(completion_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 b8e8e0b9693c7cc7c5436eee02f997a0cb55f9cd..4ac9134962f3bf551388465dfb7d65383c8f5436 100644 (file)
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -99,8 +99,6 @@ 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;