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| author | Damien Le Moal <dlemoal@kernel.org> | 2023-05-11 04:13:41 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-05-23 00:05:19 +0300 |
| commit | 624885209f31eb9985bf51abe204ecbffe2fdeea (patch) | |
| tree | bd4e48d281166df54efdc1977e4a53136f3a5e17 /drivers/scsi/scsi_sysfs.c | |
| parent | 152e52fb6ff180e97d64585e87fea44c49b8bda8 (diff) | |
| download | linux-624885209f31eb9985bf51abe204ecbffe2fdeea.tar.xz | |
scsi: core: Detect support for command duration limits
Introduce the function scsi_cdl_check() to detect if a device supports
command duration limits (CDL). Support for the READ 16, WRITE 16, READ 32
and WRITE 32 commands are checked using the function scsi_report_opcode()
to probe the rwcdlp and cdlp bits as they indicate the mode page defining
the command duration limits descriptors that apply to the command being
tested.
If any of these commands support CDL, the field cdl_supported of struct
scsi_device is set to 1 to indicate that the device supports CDL.
Support for CDL for a device is advertizes through sysfs using the new
cdl_supported device attribute. This attribute value is 1 for a device
supporting CDL and 0 otherwise.
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/20230511011356.227789-9-nks@flawful.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_sysfs.c')
| -rw-r--r-- | drivers/scsi/scsi_sysfs.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 603e8fcfcb8a..98fcbbf1c1e3 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -670,6 +670,7 @@ sdev_rd_attr (scsi_level, "%d\n"); sdev_rd_attr (vendor, "%.8s\n"); sdev_rd_attr (model, "%.16s\n"); sdev_rd_attr (rev, "%.4s\n"); +sdev_rd_attr (cdl_supported, "%d\n"); static ssize_t sdev_show_device_busy(struct device *dev, struct device_attribute *attr, @@ -1300,6 +1301,7 @@ static struct attribute *scsi_sdev_attrs[] = { &dev_attr_preferred_path.attr, #endif &dev_attr_queue_ramp_up_period.attr, + &dev_attr_cdl_supported.attr, REF_EVT(media_change), REF_EVT(inquiry_change_reported), REF_EVT(capacity_change_reported), |