From: Hannes Reinecke <hare@suse.de>
To: Damien Le Moal <damien.lemoal@wdc.com>,
Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-ide@vger.kernel.org,
"Martin K . Petersen" <martin.petersen@oracle.com>,
linux-scsi@vger.kernel.org
Subject: Re: [PATCH v8 2/5] scsi: sd: add concurrent positioning ranges support
Date: Thu, 9 Sep 2021 08:00:16 +0200 [thread overview]
Message-ID: <e6fb552e-69f7-56ca-24d6-28ebcd2537c6@suse.de> (raw)
In-Reply-To: <20210909023545.1101672-3-damien.lemoal@wdc.com>
On 9/9/21 4:35 AM, Damien Le Moal wrote:
> 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>
> ---
> drivers/scsi/sd.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++
> drivers/scsi/sd.h | 1 +
> 2 files changed, 82 insertions(+)
>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Cheers,
Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@suse.de +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
next prev parent reply other threads:[~2021-09-09 6:00 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-09 2:35 [PATCH v8 0/5] Initial support for multi-actuator HDDs Damien Le Moal
2021-09-09 2:35 ` [PATCH v8 1/5] block: Add independent access ranges support Damien Le Moal
2021-09-09 5:59 ` Hannes Reinecke
2021-09-09 2:35 ` [PATCH v8 2/5] scsi: sd: add concurrent positioning " Damien Le Moal
2021-09-09 6:00 ` Hannes Reinecke [this message]
2021-09-09 2:35 ` [PATCH v8 3/5] libata: support concurrent positioning ranges log Damien Le Moal
2021-09-09 2:35 ` [PATCH v8 4/5] doc: document sysfs queue/independent_access_ranges attributes Damien Le Moal
2021-09-09 2:35 ` [PATCH v8 5/5] doc: Fix typo in request queue sysfs documentation Damien Le Moal
2021-09-14 0:38 ` [PATCH v8 0/5] Initial support for multi-actuator HDDs Damien Le Moal
2021-09-27 9:17 ` Damien Le Moal
2021-09-29 3:55 ` Martin K. Petersen
2021-10-11 7:50 ` Damien Le Moal
2021-10-11 11:28 ` Tim Walker
2021-10-15 8:20 ` Damien Le Moal
2021-10-27 0:34 ` Keith Busch
2021-10-27 0:45 ` Jens Axboe
2021-10-27 0:49 ` Damien Le Moal
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