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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>
This commit is contained in:
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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3
include/linux/libata.h
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@ -166,6 +166,7 @@ enum {
ATA_DFLAG_NO_UNLOAD = (1 << 17), /* device doesn't support unload */
ATA_DFLAG_UNLOCK_HPA = (1 << 18), /* unlock HPA */
ATA_DFLAG_NCQ_SEND_RECV = (1 << 19), /* device supports NCQ SEND and RECV */
ATA_DFLAG_NCQ_PRIO = (1 << 20), /* device supports NCQ priority */
ATA_DFLAG_INIT_MASK = (1 << 24) - 1,
ATA_DFLAG_DETACH = (1 << 24),
@ -342,7 +343,9 @@ enum {
ATA_SHIFT_PIO = 0,
ATA_SHIFT_MWDMA = ATA_SHIFT_PIO + ATA_NR_PIO_MODES,
ATA_SHIFT_UDMA = ATA_SHIFT_MWDMA + ATA_NR_MWDMA_MODES,
ATA_SHIFT_PRIO = 6,
ATA_PRIO_HIGH = 2,
/* size of buffer to pad xfers ending on unaligned boundaries */
ATA_DMA_PAD_SZ = 4,