dmaengine: idxd: Add wq occupancy information to sysfs attribute

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Add occupancy information to wq sysfs attribute. Attribute will show
wq occupancy data if "WQ Occupancy Support" field in WQCAP is 1. It
displays the number of entries currently in this WQ. This is provided
as an estimate and should not be relied on to determine whether there
is space in the WQ. The data is to provide information to user apps
for flow control.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162275745546.1857062.8765615879420582018.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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Dave Jiang 2021-06-03 14:57:35 -07:00 • committed by Vinod Koul

parent 0dcfe41e9a

commit e753a64bee

3 changed files with 29 additions and 0 deletions

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7

Documentation/ABI/stable/sysfs-driver-dma-idxd

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3

drivers/dma/idxd/registers.h

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19

drivers/dma/idxd/sysfs.c

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