dmaengine: ioatdma: disable relaxed ordering for ioatdma

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ioatdma by default is in snoop mode. Relaxed ordering according to spec
does not do anything in snoop mode. However, it causes hang or significant
performance degrade when tested with NTB. Disabling in the driver due to
some BIOS do not configure it correctly.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

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Dave Jiang 2016-05-11 14:32:49 -07:00 • committed by Vinod Koul

parent 3b2bc8a732

commit 511deae026

2 changed files with 19 additions and 0 deletions

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12

drivers/dma/ioat/init.c

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7

drivers/dma/ioat/registers.h

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