linux-kernel - Re: [PATCH v2 7/8] [PATCH 7/8] drivers/hwmon: Add a generic PECI hwmon client driver

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Message-ID: <CANiq72mjsfJRzfFmhbL7dnih_0=2pFoJDTrmi35x0yLmKrSBFA@mail.gmail.com>
Date:   Sat, 24 Feb 2018 01:00:47 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Cc:     Andrew Lunn <andrew@...n.ch>, Guenter Roeck <linux@...ck-us.net>,
        joel@....id.au, andrew@...id.au, Arnd Bergmann <arnd@...db.de>,
        Greg KH <gregkh@...uxfoundation.org>, jdelvare@...e.com,
        benh@...nel.crashing.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-doc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        openbmc@...ts.ozlabs.org
Subject: Re: [PATCH v2 7/8] [PATCH 7/8] drivers/hwmon: Add a generic PECI
 hwmon client driver

On Thu, Feb 22, 2018 at 2:29 AM, Jae Hyun Yoo
<jae.hyun.yoo@...ux.intel.com> wrote:
> On 2/21/2018 4:37 PM, Andrew Lunn wrote:
>>>
>>> But even with this change, it still needs to use delayed creation
>>> because BMC side kernel doesn't know how many DIMMs are populated on
>>> a remote server before the remote server completes its memory
>>> training and testing in BIOS, but it needs to check the remote
>>> server's CPU temperature as immediate as possible to make
>>> appropriate thermal control based on the remote CPU's temperature to
>>> avoid any critical thermal issue. What would be a better solution in
>>> this case?
>>
>>
>> You could change this driver so that it supports one DIMM.  Move the
>> 'hotplug' part into another driver which creates and destroys
>> instances of the hwmon DIMM device as the DIMMS come and go.
>>
>> Also, do you need to handle CPU hotplug? You could split the CPU
>> temperature part into a separate hwmon driver? And again create and
>> destroy devices as CPUs come and go?
>>
>>         Andrew
>>
>
> That seems like a possible option. I'll rewrite the hwmon driver again like
> that.
>
> Thanks for the good idea. :)

By the way, in the rewrite, please try to avoid the create*workqueue()
functions (they are deprecated :).

Cheers,
Miguel

>
> Jae