linux-kernel - [PATCH 0/2] Export max open zones and max active zones to sysfs

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Message-Id: <20200616102546.491961-1-niklas.cassel@wdc.com>
Date:   Tue, 16 Jun 2020 12:25:44 +0200
From:   Niklas Cassel <niklas.cassel@....com>
To:     Jonathan Corbet <corbet@....net>, Jens Axboe <axboe@...nel.dk>,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Niklas Cassel <niklas.cassel@....com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org
Subject: [PATCH 0/2] Export max open zones and max active zones to sysfs

Export max open zones and max active zones to sysfs.

This patch series depends on the Zoned Namespace Command Set series:
https://lore.kernel.org/linux-nvme/20200615233424.13458-1-keith.busch@wdc.com/

All zoned block devices in the kernel utilize the "zoned block device
support" (CONFIG_BLK_DEV_ZONED).

The Zoned Namespace Command Set Specification defines two different
resource limits: Max Open Resources and Max Active Resources.

The ZAC and ZBC standards define a MAXIMUM NUMBER OF OPEN SEQUENTIAL WRITE
REQUIRED ZONES field.

Since the ZNS Max Open Resources field has the same purpose as the ZAC/ZBC
field, (the ZNS field is 0's based, the ZAC/ZBC field isn't), create a
common "max_open_zones" definition in the sysfs documentation, and export
both the ZNS field and the ZAC/ZBC field according to this new common
definition.

The ZNS Max Active Resources field does not have an equivalent field in
ZAC/ZBC, however, since both ZAC/ZBC and ZNS utilize the "zoned block
device support" in the kernel, create a "max_active_zones" definition in
the sysfs documentation, similar to "max_open_zones", and export it
according to this new definition. For ZAC/ZBC devices, this field will be
exported as 0, meaning "no limit".

Niklas Cassel (2):
  block: add max_open_zones to blk-sysfs
  block: add max_active_zones to blk-sysfs

 Documentation/block/queue-sysfs.rst | 14 ++++++++++
 block/blk-sysfs.c                   | 27 +++++++++++++++++++
 drivers/nvme/host/zns.c             |  2 ++
 drivers/scsi/sd_zbc.c               |  5 ++++
 include/linux/blkdev.h              | 40 +++++++++++++++++++++++++++++
 5 files changed, 88 insertions(+)

-- 
2.26.2