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Commit 9ef02621 authored by Leonid Ravich's avatar Leonid Ravich Committed by Greg Kroah-Hartman
Browse files

dmaengine: ioat setting ioat timeout as module parameter 



[ 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: default avatarLeonid Ravich <Leonid.Ravich@emc.com>
Reviewed-by: default avatarDave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20200701184816.29138-1-leonid.ravich@dell.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 05f479dc

drivers/dma/ioat/dma.c

+12 −0
Original line number Diff line number Diff line
@@ -38,6 +38,18 @@ 


#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 Destination Address Error",

	"Next Descriptor Address Error",

drivers/dma/ioat/dma.h

+0 −2
Original line number Diff line number Diff line
@@ -111,8 +111,6 @@ 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;