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

[Hannes Reinecke <hare@suse.de>]

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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