path: root/include/linux/libata.h
diff options
authorDamien Le Moal <damien.lemoal@wdc.com>2021-08-16 10:44:54 +0900
committerJens Axboe <axboe@kernel.dk>2021-08-18 07:19:39 -0600
commit5f91b8f54874300a8e3c6c89f39ce5a74a449f2c (patch)
tree50ca507c636ecbe164ba259bbe944fd80d689919 /include/linux/libata.h
parentlibata: print feature list on device scan (diff)
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/libata.h')
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;
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;