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From: Alan Adamson <alan.adamson@oracle.com>
To: linux-nvme@lists.infradead.org
Cc: alan.adamson@oracle.com, kbusch@kernel.org, axboe@fb.com,
	hch@lst.de, sagi@grimberg.me
Subject: [PATCH 0/1] nvme: Export CSTS register via sysfs
Date: Wed, 17 Mar 2021 16:46:14 -0400	[thread overview]
Message-ID: <20210317204615.13971-1-alan.adamson@oracle.com> (raw)

This patch exports the NVMe Controller CSTS register via sysfs.  This
feature can be used by userland executables that accessed CSTS and
possibly other registers by mapping them into user space.  Since this ability
may not always available, exporting certain registers via sysfs provides
a safe/read-only way to access registers from outside the kernel.

Testing:

# Controller in the RDY state
# cat /sys/devices/pci0000:00/0000:00:04.0/nvme/nvme0/csts
1

# Controller in the FAILED state
# cat /sys/devices/pci0000:00/0000:00:04.0/nvme/nvme0/csts
2

# A virtualized csts register can be accessed for fabric devices 
# cat /sys/devices/virtual/nvme-fabrics/ctl/nvme1/csts
1

Alan Adamson (1):
  Export CSTS register via sysfs

 drivers/nvme/host/core.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

-- 
2.18.4


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             reply	other threads:[~2021-03-17 20:51 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-17 20:46 Alan Adamson [this message]
2021-03-17 20:46 ` [PATCH 1/1] nvme: Export CSTS register via sysfs Alan Adamson
2021-03-18  1:06 ` [PATCH 0/1] " Chaitanya Kulkarni
2021-03-18  4:38 ` Christoph Hellwig
2021-03-18 14:19   ` Keith Busch
2021-03-18 16:28   ` Alan Adamson
2021-03-18 16:52     ` Keith Busch
2021-03-18 18:39       ` Alan Adamson
2021-03-18 19:46         ` Keith Busch
2021-03-19  6:51           ` Christoph Hellwig
2021-03-19 15:22             ` Keith Busch
2021-03-19 15:30               ` Christoph Hellwig
2021-03-19 17:21                 ` Alan Adamson
2021-03-19 17:30                   ` Keith Busch
2021-03-19 17:33                     ` Alan Adamson
2021-05-05 18:40                     ` Alan Adamson
2021-05-05 20:11                       ` Keith Busch
2021-05-05 20:23                         ` Alan Adamson
2021-05-05 20:35                           ` Keith Busch
2021-03-18 19:15       ` Chaitanya Kulkarni

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