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| author |   Damien Le Moal <damien.lemoal@wdc.com> | 2021-08-16 10:44:54 +0900 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-08-18 07:19:39 -0600 |
| commit | 5f91b8f54874300a8e3c6c89f39ce5a74a449f2c (patch) | |
| tree | 50ca507c636ecbe164ba259bbe944fd80d689919 /include/linux | |
| parent | libata: print feature list on device scan (diff) | |
| download | linux-dev-5f91b8f54874300a8e3c6c89f39ce5a74a449f2c.tar.xz linux-dev-5f91b8f54874300a8e3c6c89f39ce5a74a449f2c.zip | |
libata: Introduce ncq_prio_supported sysfs sttribute
Currently, the only way a user can determine if a SATA device supports
NCQ priority is to try to enable the use of this feature using the
ncq_prio_enable sysfs device attribute. If enabling the feature fails,
it is because the device does not support NCQ priority. Otherwise, the
feature is enabled and success indicates that the device supports NCQ
priority.
Improve this odd interface by introducing the read-only
ncq_prio_supported sysfs device attribute to indicate if a SATA device
supports NCQ priority. The value of this attribute reflects the status
of device flag ATA_DFLAG_NCQ_PRIO, which is set only for devices
supporting NCQ priority.
Add this new sysfs attribute to the device attributes group of libahci
and libata-sata.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Link: https://lore.kernel.org/r/20210816014456.2191776-10-damien.lemoal@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/libata.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h index b23f28cfc8e0..a2d1bae7900b 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -539,6 +539,7 @@ typedef void (*ata_postreset_fn_t)(struct ata_link *link, unsigned int *classes) extern struct device_attribute dev_attr_unload_heads; #ifdef CONFIG_SATA_HOST extern struct device_attribute dev_attr_link_power_management_policy; +extern struct device_attribute dev_attr_ncq_prio_supported; extern struct device_attribute dev_attr_ncq_prio_enable; extern struct device_attribute dev_attr_em_message_type; extern struct device_attribute dev_attr_em_message; |