dmaengine: idxd: rotate portal address for better performance

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The device submission portal is on a 4k page and any of those 64bit aligned
address on the page can be used for descriptor submission. By rotating the
offset through the 4k range and prevent successive writes to the same MMIO
address, performance improvement is observed through testing.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162681372446.1968485.10634280461681015569.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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Dave Jiang 2021-07-20 13:42:04 -07:00 • committed by Vinod Koul

parent 673d812d30

commit a9c171527a

3 changed files with 22 additions and 1 deletions

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1

drivers/dma/idxd/device.c

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20

drivers/dma/idxd/idxd.h

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2

drivers/dma/idxd/submit.c

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