Re: [PATCH 0/4] Initial support for multi-actuator HDDs

On 7/21/21 12:42 PM, 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.

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

Oh well, you beat me to it.
Actually I have patches here locally, which just had been waiting for the missing SBC definitions, which apparently are present now.

Too bad; should have been more aggressive posting them :-)

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@suse.de                              +49 911 74053 688
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