linux-kernel - Re: [PATCH] nvme: Add hardware monitoring support

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Message-ID: <20191028073953.GA20443@lst.de>
Date:   Mon, 28 Oct 2019 08:39:53 +0100
From:   Christoph Hellwig <hch@....de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Keith Busch <kbusch@...nel.org>,
        Chris Healy <Chris.Healy@....aero>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org,
        Akinobu Mita <akinobu.mita@...il.com>, linux-pm@...r.kernel.org
Subject: Re: [PATCH] nvme: Add hardware monitoring support

On Sun, Oct 27, 2019 at 07:41:56PM -0700, Guenter Roeck wrote:
> 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.

So these reported values seem to generate some interest.  Adding Akinobu
Mita who also planned to wire them up to the thermal framework.  I don't
really know either upper layer so I'm not sure which is the right one,
but with this just like with the previous series I am quite worried that
we add a lot of kernel boilerplate code for information people can
trivially get using nvme-cli.