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authorDamien Le Moal <dlemoal@kernel.org>2023-05-11 03:13:42 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2023-05-22 17:05:19 -0400
commit1b22cfb14142aba7742d307c4f8d7006f919308c (patch)
tree27f10d331c3e090a7e9903cd7c16663eaed9d4c7 /drivers/scsi/sd.c
parent624885209f31eb9985bf51abe204ecbffe2fdeea (diff)
scsi: core: Allow enabling and disabling command duration limits
Add the sysfs scsi_device attribute cdl_enable to allow a user to enable or disable a device command duration limits feature. CDL is disabled by default. This feature must be explicitly enabled by a user by setting the cdl_enable attribute to 1. The new function scsi_cdl_enable() does not do anything beside setting the cdl_enable field of struct scsi_device in the case of a (real) SCSI device (e.g. a SAS HDD). For ATA devices, the command duration limits feature needs to be enabled/disabled using the ATA feature sub-page of the control mode page. To do so, the scsi_cdl_enable() function checks if this mode page is supported using scsi_mode_sense(). If it is, scsi_mode_select() is used to enable and disable CDL. Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Hannes Reinecke <hare@suse.de> Co-developed-by: Niklas Cassel <niklas.cassel@wdc.com> Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> Link: https://lore.kernel.org/r/20230511011356.227789-10-nks@flawful.org Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/sd.c')
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