On 2021/07/26 10:38, Damien Le Moal wrote: > Single LUN multi-actuator hard-disks are cappable to seek and execute > multiple commands in parallel. This capability is exposed to the host > using the Concurrent Positioning Ranges VPD page (SCSI) and Log (ATA). > Each positioning range describes the contiguous set of LBAs that an > actuator serves. > > This series adds support the scsi disk driver to retreive this > information and advertize it to user space through sysfs. libata is also > modified to handle ATA drives. > > The first patch adds the block layer plumbing to expose concurrent > sector ranges of the device through sysfs as a sub-directory of the > device sysfs queue directory. Patch 2 and 3 add support to sd and > libata. Finally patch 4 documents the sysfs queue attributed changes. > > This series does not attempt in any way to optimize accesses to > multi-actuator devices (e.g. block IO scheduler or filesystems). This > initial support only exposes the actuators information to user space > through sysfs. Jens, Martin, Any comment on this series ? > > Changes from v2: > * Update patch 1 to fix a compilation warning for a potential NULL > pointer dereference of the cr argument of blk_queue_set_cranges(). > Warning reported by the kernel test robot <lkp@xxxxxxxxx>). > > Changes from v1: > * Moved libata-scsi hunk from patch 1 to patch 3 where it belongs > * Fixed unintialized variable in patch 2 > Reported-by: kernel test robot <lkp@xxxxxxxxx> > Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx > * Changed patch 3 adding struct ata_cpr_log to contain both the number > of concurrent ranges and the array of concurrent ranges. > * Added a note in the documentation (patch 4) about the unit used for > the concurrent ranges attributes. > > Damien Le Moal (4): > block: Add concurrent positioning ranges support > scsi: sd: add concurrent positioning ranges support > libata: support concurrent positioning ranges log > doc: document sysfs queue/cranges attributes > > Documentation/block/queue-sysfs.rst | 30 ++- > block/Makefile | 2 +- > block/blk-cranges.c | 295 ++++++++++++++++++++++++++++ > block/blk-sysfs.c | 13 ++ > block/blk.h | 3 + > drivers/ata/libata-core.c | 52 +++++ > drivers/ata/libata-scsi.c | 48 ++++- > drivers/scsi/sd.c | 81 ++++++++ > drivers/scsi/sd.h | 1 + > include/linux/ata.h | 1 + > include/linux/blkdev.h | 29 +++ > include/linux/libata.h | 15 ++ > 12 files changed, 559 insertions(+), 11 deletions(-) > create mode 100644 block/blk-cranges.c > -- Damien Le Moal Western Digital Research
