linux-kernel - Re: [PATCH v2] platform/x86: wmi-bmof: New driver to expose embedded Binary WMI MOF metadata

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Message-Id: <201706191819.37016@pali>
Date:   Mon, 19 Jun 2017 18:19:36 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Mario.Limonciello@...l.com
Cc:     luto@...nel.org, platform-driver-x86@...r.kernel.org,
        andriy.shevchenko@...ux.intel.com, luto@...capital.net,
        rjw@...ysocki.net, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2] platform/x86: wmi-bmof: New driver to expose embedded Binary WMI MOF metadata

On Monday 19 June 2017 18:13:13 Mario.Limonciello@...l.com wrote:
> > -----Original Message-----
> > From: Pali Rohár [mailto:pali.rohar@...il.com]
> > Sent: Monday, June 19, 2017 11:08 AM
> > To: Andy Lutomirski <luto@...nel.org>
> > Cc: platform-driver-x86@...r.kernel.org; Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com>; Andy Lutomirski
> > <luto@...capital.net>; Limonciello, Mario
> > <Mario_Limonciello@...l.com>; Rafael Wysocki <rjw@...ysocki.net>;
> > linux-kernel@...r.kernel.org; linux-acpi@...r.kernel.org Subject:
> > Re: [PATCH v2] platform/x86: wmi-bmof: New driver to expose
> > embedded Binary WMI MOF metadata
> > 
> > On Tuesday 06 June 2017 05:16:44 Andy Lutomirski wrote:
> > > Many laptops (and maybe servers?) have embedded WMI Binary MOF
> > > metadata. We do not yet have open-source tools for processing the
> > > 
> > > data, although one is in the works thanks to Pali:
> > > 	https://github.com/pali/bmfdec
> > > 
> > > There is currently no interface to get the data in the first
> > > place. By exposing it, we facilitate the development of new
> > > tools.
> > > 
> > > Signed-off-by: Andy Lutomirski <luto@...nel.org>
> > > Cc: Andy Lutomirski <luto@...capital.net>
> > > Cc: Mario Limonciello <mario_limonciello@...l.com>
> > > Cc: Pali Rohár <pali.rohar@...il.com>
> > > Cc: linux-kernel@...r.kernel.org
> > > Cc: platform-driver-x86@...r.kernel.org
> > > Cc: linux-acpi@...r.kernel.org
> > > [dvhart: make sysfs mof binary read only, fixup comment block
> > > format] [dvhart: use bmof terminology and dev_err instead of
> > > dev_warn] Acked-by: Rafael J. Wysocki
> > > <rafael.j.wysocki@...el.com> Signed-off-by: Darren Hart (VMware)
> > > <dvhart@...radead.org> ---
> > > 
> > > since-v1:
> > >  * address Pali's comments:
> > >    * update the cover letter for clarity and accuracy
> > >    * update mof->bmof and MOF to Binary MOF throughout the patch
> > >    * use dev_err instead of dev_warn in wmi_bmof_probe
> > >  
> > >  drivers/platform/x86/Kconfig    |  12 ++++
> > >  drivers/platform/x86/Makefile   |   1 +
> > >  drivers/platform/x86/wmi-bmof.c | 125
> > 
> > Another suggestion (unrelated to this patch): For working with
> > ACPI-WMI, this binary MOF buffer is not enough. It is needed also
> > content of _WDG buffer. What about exporting it too via sysfs?
> > Probably not part of of wmi-bmof driver, but wmi driver itself.
> 
> I think this depends upon how the userspace access to WMI methods
> gets implemented, no?  If userpsace access to WMI methods show up as
> /dev/wmi-$GUID-$INSTANCE and those internally to the kernel map to
> the proper ASL methods for example, what you get from wmi-bmof
> should be enough shouldn't it?

Ok. Such interface for userspace application could be enough.

But for debugging purposes or writing new WMI driver it is needed to 
have both _WDG + BMOF.

-- 
Pali Rohár
pali.rohar@...il.com

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