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authorDamien Le Moal <dlemoal@kernel.org>2023-05-11 04:13:42 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2023-05-23 00:05:19 +0300
commit1b22cfb14142aba7742d307c4f8d7006f919308c (patch)
tree27f10d331c3e090a7e9903cd7c16663eaed9d4c7 /include/scsi
parent624885209f31eb9985bf51abe204ecbffe2fdeea (diff)
downloadlinux-1b22cfb14142aba7742d307c4f8d7006f919308c.tar.xz
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 'include/scsi')
-rw-r--r--include/scsi/scsi_device.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 6b8df9e253a0..b2cdb078b7bd 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -219,6 +219,7 @@ struct scsi_device {
unsigned no_vpd_size:1; /* No VPD size reported in header */
unsigned cdl_supported:1; /* Command duration limits supported */
+ unsigned cdl_enable:1; /* Enable/disable Command duration limits */
unsigned int queue_stopped; /* request queue is quiesced */
bool offline_already; /* Device offline message logged */
@@ -367,6 +368,7 @@ extern void scsi_remove_device(struct scsi_device *);
extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
void scsi_attach_vpd(struct scsi_device *sdev);
void scsi_cdl_check(struct scsi_device *sdev);
+int scsi_cdl_enable(struct scsi_device *sdev, bool enable);
extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
extern int __must_check scsi_device_get(struct scsi_device *);