From: Christoph Hellwig <hch@lst.de>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Sagi Grimberg <sagi@grimberg.me>,
Linux PM <linux-pm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-nvme@lists.infradead.org,
Akinobu Mita <akinobu.mita@gmail.com>, Jens Axboe <axboe@fb.com>,
Keith Busch <kbusch@kernel.org>, Christoph Hellwig <hch@lst.de>,
Chris Healy <cphealy@gmail.com>
Subject: Re: [PATCH v2] nvme: Add hardware monitoring support
Date: Thu, 31 Oct 2019 14:46:42 +0100 [thread overview]
Message-ID: <20191031134642.GC4763@lst.de> (raw)
In-Reply-To: <2931487e-2720-fd42-fda0-e47cf89c90c9@roeck-us.net>
On Wed, Oct 30, 2019 at 07:54:47PM -0700, Guenter Roeck wrote:
> On 10/30/19 7:05 AM, Christoph Hellwig wrote:
>> On Wed, Oct 30, 2019 at 08:16:48PM +0900, Akinobu Mita wrote:
>>> The nvme_init_identify() can be called multiple time in nvme ctrl's
>>> lifetime (e.g 'nvme reset /dev/nvme*' or suspend/resume paths), so
>>> should we need to prevent nvme_hwmon_init() from registering hwmon
>>> device more than twice?
>>>
>>> In the nvme thermal zone patchset[1], thernal zone is registered in
>>> nvme_init_identify and unregistered in nvme_stop_ctrl().
>>
>> So Guenter said above the thermal subsystem could use the information
>> from hwmon as well. Does this mean this patch would solve your needs
>> as well?
>>
> Depends on the requirements. Unlike hwmon/iio, we don't have clear
> guidelines describing when thermal vs. hwmon would be a better choice.
> There is some interconnect between thermal and hwmon, but quite often
> it is a one-way street (hwmon devices can easily register thermal
> zones, for thermal zone devices it is a bit more difficult to register
> associated hwmon devices).
I'd like to hear from Akinobu-san if this also solves the thermal zone
use case. If so I'd be much happier as we at least solve two use cases
with one patch.
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next prev parent reply other threads:[~2019-10-31 13:46 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-29 22:32 [PATCH v2] nvme: Add hardware monitoring support Guenter Roeck
2019-10-30 0:53 ` Keith Busch
2019-11-06 21:29 ` Pavel Machek
2019-11-06 22:30 ` Guenter Roeck
2019-11-06 23:58 ` Chris Healy
2019-10-30 11:16 ` Akinobu Mita
2019-10-30 14:05 ` Christoph Hellwig
2019-10-31 2:54 ` Guenter Roeck
2019-10-31 13:46 ` Christoph Hellwig [this message]
2019-10-31 13:46 ` Akinobu Mita
2019-10-31 2:20 ` Guenter Roeck
2019-10-31 13:44 ` Akinobu Mita
2019-10-31 13:45 ` Christoph Hellwig
2019-10-31 17:54 ` Guenter Roeck
2019-10-30 14:12 ` Christoph Hellwig
2019-10-30 23:40 ` Chris Healy
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