diff options
| author | Damien Le Moal <damien.lemoal@wdc.com> | 2021-10-27 11:22:20 +0900 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-10-26 21:01:48 -0600 |
| commit | e815d36548f01797ce381be8f0b74f4ba9befd15 (patch) | |
| tree | c74c9303990a9d538eb5a3488405b3ee1be4a850 /include/linux/fpga/fpga-mgr.h | |
| parent | a2247f19ee1c5ad75ef095cdfb909a3244b88aa8 (diff) | |
scsi: sd: add concurrent positioning ranges support
Add the sd_read_cpr() function to the sd scsi disk driver to discover
if a device has multiple concurrent positioning ranges (i.e. multiple
actuators on an HDD). The existence of VPD page B9h indicates if a
device has multiple concurrent positioning ranges. The page content
describes each range supported by the device.
sd_read_cpr() is called from sd_revalidate_disk() and uses the block
layer functions disk_alloc_independent_access_ranges() and
disk_set_independent_access_ranges() to represent the set of actuators
of the device as independent access ranges.
The format of the Concurrent Positioning Ranges VPD page B9h is defined
in section 6.6.6 of SBC-5.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20211027022223.183838-3-damien.lemoal@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions