linux-kernel - Re: [PATCH v4 0/9] hwmon: (dell-smm) Add support for WMI SMM interface

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Date:   Thu, 30 Nov 2023 20:17:55 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Armin Wolf <W_Armin@....de>, pali@...nel.org
Cc:     jdelvare@...e.com, hdegoede@...hat.com, markgross@...nel.org,
        ilpo.jarvinen@...ux.intel.com, platform-driver-x86@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/9] hwmon: (dell-smm) Add support for WMI SMM
 interface

On 11/22/23 16:48, Armin Wolf wrote:
> This patch series adds support for an alternative SMM calling
> backend to the dell-smm-hwmon driver. The reason for this is
> that on some modern machines, the legacy SMM calling interface
> does not work anymore and the SMM handler can be called over
> ACPI WMI instead.
> 
> The first four patches prepare the driver by allowing to
> specify different SMM calling backends, and by moving most of
> the DMI handling into i8k_init() so that the DMI tables can
> keep their __initconst attributes (the WMI SMM backend driver
> does not probe at module init time). The fifth patch does some
> minor cleanup, while the next three patches implement the new
> WMI SMM calling backend. The last patch adds the machine of
> the user who requested and tested the changes to the fan control
> whitelist.
> 
> If the driver does not detect the legacy SMM interface, either
> because the machine is not whitelisted or because the SMM handler
> does not react, it registers an WMI driver which will then bound
> to the WMI SMM interface and do the remaining initialization.
> 
> The deprecated procfs interface is not supported when using the
> WMI SMM calling backend for the following reason: the WMI driver
> can potentially be instantiated multiple times while the deprectated
> procfs interface cannot. This should not cause any regressions
> because on machines supporting only the WMI SMM interface, the
> driver would, until now, not load anyway.
> 
> All patches where tested on a Dell Inspiron 3505 and a Dell
> OptiPlex 7000.
> 

Series applied.

Thanks,
Guenter