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| author | Adam Manzanares <adam.manzanares@hgst.com> | 2016-10-17 21:27:29 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2016-10-19 21:34:36 +0300 |
| commit | 8e061784b51ec4a4efed0deaafb5bd9725bf5b06 (patch) | |
| tree | 30d253d6d6a214f6514484bfe1d2c3b178fdf62e /include/linux/ata.h | |
| parent | 5dc8b362a2374d007bc0db649b7ab6a79dd32bda (diff) | |
| download | linux-8e061784b51ec4a4efed0deaafb5bd9725bf5b06.tar.xz | |
ata: Enabling ATA Command Priorities
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>
Diffstat (limited to 'include/linux/ata.h')
| -rw-r--r-- | include/linux/ata.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/ata.h b/include/linux/ata.h index fdb180367ba1..af6859b3a93d 100644 --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -348,6 +348,7 @@ enum { ATA_LOG_DEVSLP_DETO = 0x01, ATA_LOG_DEVSLP_VALID = 0x07, ATA_LOG_DEVSLP_VALID_MASK = 0x80, + ATA_LOG_NCQ_PRIO_OFFSET = 0x09, /* NCQ send and receive log */ ATA_LOG_NCQ_SEND_RECV_SUBCMDS_OFFSET = 0x00, @@ -940,6 +941,11 @@ static inline bool ata_id_has_ncq_non_data(const u16 *id) return id[ATA_ID_SATA_CAPABILITY_2] & BIT(5); } +static inline bool ata_id_has_ncq_prio(const u16 *id) +{ + return id[ATA_ID_SATA_CAPABILITY] & BIT(12); +} + static inline bool ata_id_has_trim(const u16 *id) { if (ata_id_major_version(id) >= 7 && |