ata: Enabling ATA Command Priorities

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This patch checks to see if an ATA device supports NCQ command priorities.
If so and the user has specified an iocontext that indicates
IO_PRIO_CLASS_RT then we build a tf with a high priority command.

This is done to improve the tail latency of commands that are high
priority by passing priority to the device.

tj: Removed trivial ata_ncq_prio_enabled() and open-coded the test.

Signed-off-by: Adam Manzanares <adam.manzanares@hgst.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Adam Manzanares 2016-10-17 11:27:29 -07:00 • committed by Tejun Heo

parent 5dc8b362a2

commit 8e061784b5

5 changed files with 49 additions and 3 deletions

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6

include/linux/ata.h

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3

include/linux/libata.h

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