diff options
| author | Damien Le Moal <dlemoal@kernel.org> | 2023-05-11 03:13:41 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-05-22 17:05:19 -0400 |
| commit | 624885209f31eb9985bf51abe204ecbffe2fdeea (patch) | |
| tree | bd4e48d281166df54efdc1977e4a53136f3a5e17 /include/scsi | |
| parent | 152e52fb6ff180e97d64585e87fea44c49b8bda8 (diff) | |
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 'include/scsi')
| -rw-r--r-- | include/scsi/scsi_device.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index c93c5aaf637e..6b8df9e253a0 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -218,6 +218,8 @@ struct scsi_device { unsigned silence_suspend:1; /* Do not print runtime PM related messages */ unsigned no_vpd_size:1; /* No VPD size reported in header */ + unsigned cdl_supported:1; /* Command duration limits supported */ + unsigned int queue_stopped; /* request queue is quiesced */ bool offline_already; /* Device offline message logged */ @@ -364,6 +366,7 @@ extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 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); extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); extern int __must_check scsi_device_get(struct scsi_device *); |