Re: [PATCH v2] nvme: Add hardware monitoring support

From: Pavel Machek <pavel@ucw.cz>
To: Keith Busch <kbusch@kernel.org>
Cc: Sagi Grimberg <sagi@grimberg.me>,
	linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-nvme@lists.infradead.org,
	Akinobu Mita <akinobu.mita@gmail.com>, Jens Axboe <axboe@fb.com>,
	Chris Healy <cphealy@gmail.com>, Christoph Hellwig <hch@lst.de>,
	Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH v2] nvme: Add hardware monitoring support
Date: Wed, 6 Nov 2019 22:29:21 +0100	[thread overview]
Message-ID: <20191106212921.GA7020@amd> (raw)
In-Reply-To: <20191030005327.GC15332@redsun51.ssa.fujisawa.hgst.com>

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Hi!

> > nvme devices report temperature information in the controller information
> > (for limits) and in the smart log. Currently, the only means to retrieve
> > this information is the nvme command line interface, which requires
> > super-user privileges.
> > 
> > At the same time, it would be desirable to use NVME temperature information
> > for thermal control.
> > 
> > This patch adds support to read NVME temperatures from the kernel using the
> > hwmon API and adds temperature zones for NVME drives. The thermal subsystem
> > can use this information to set thermal policies, and userspace can access
> > it using libsensors and/or the "sensors" command.
> > 
> > Example output from the "sensors" command:
> > 
> > nvme0-pci-0100
> > Adapter: PCI adapter
> > Composite:    +39.0°C  (high = +85.0°C, crit = +85.0°C)
> > Sensor 1:     +39.0°C
> > Sensor 2:     +41.0°C
> > 
> > Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> 
> This looks fine to me, but I'll wait a few more days to see if there are
> any additional comments..

User wants to know temperature of /dev/sda... and we already have an
userspace tools knowing about smart, etc...

pavel@amd:/data/film$ sudo hddtemp /dev/sda
/dev/sda: ST1000LM014-1EJ164: 48°C

I see we also have sensors framework but it does _not_ handle
harddrive temperatures.

Does it need some kind of unification? Should NVMe devices expose
"SMART" information in the same way other SSDs do?

Best regards,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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