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. 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 | 27 ++- block/Makefile | 2 +- block/blk-cranges.c | 286 ++++++++++++++++++++++++++++ block/blk-sysfs.c | 13 ++ block/blk.h | 3 + drivers/ata/libata-core.c | 57 ++++++ drivers/ata/libata-scsi.c | 47 ++++- drivers/scsi/sd.c | 80 ++++++++ drivers/scsi/sd.h | 1 + include/linux/ata.h | 1 + include/linux/blkdev.h | 29 +++ include/linux/libata.h | 11 ++ 12 files changed, 546 insertions(+), 11 deletions(-) create mode 100644 block/blk-cranges.c -- 2.31.1
