scsi: sd: Set read/write command CDL index

Introduce the command duration limits helper function sd_cdl_dld() to set
the DLD bits of READ/WRITE 16 and READ/WRITE 32 commands to indicate to the
device the command duration limit descriptor to apply to the commands.

When command duration limits are enabled, sd_cdl_dld() obtains the index of
the descriptor to apply to the command using the hints field of the request
IO priority value (hints IOPRIO_HINT_DEV_DURATION_LIMIT_1 to
IOPRIO_HINT_DEV_DURATION_LIMIT_7).

If command duration limits is disabled (which is the default), the limit
index "0" is always used to indicate "no limit" for a command.

Signed-off-by: Damien Le Moal <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Co-developed-by: Niklas Cassel <[email protected]>
Signed-off-by: Niklas Cassel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

0 files changed, 0 insertions, 0 deletions