linux-kernel - Re: RFC: WMI Enhancements

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Message-ID: <20170508152907.GA17700@fury>
Date:   Mon, 8 May 2017 08:29:07 -0700
From:   Darren Hart <dvhart@...radead.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Mario.Limonciello@...l.com,
        Pali Rohár <pali.rohar@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>,
        Corentin Chary <corentin.chary@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: RFC: WMI Enhancements

On Fri, May 05, 2017 at 06:25:08PM -0700, Andy Lutomirski wrote:
> On Fri, May 5, 2017 at 5:51 PM,  <Mario.Limonciello@...l.com> wrote:
> >> -----Original Message-----
> >> From: Darren Hart [mailto:dvhart@...radead.org]
> >> Sent: Friday, May 5, 2017 6:45 PM
> >> To: Limonciello, Mario <Mario_Limonciello@...l.com>
> >> Cc: pali.rohar@...il.com; rjw@...ysocki.net; luto@...capital.net;
> >> len.brown@...el.com; corentin.chary@...il.com; luto@...nel.org;
> >> andriy.shevchenko@...ux.intel.com; linux-kernel@...r.kernel.org; platform-
> >> driver-x86@...r.kernel.org; linux-pm@...r.kernel.org
> >> Subject: Re: RFC: WMI Enhancements
> 
> 
> > I meant that to say that at least for now Andy's wmi-mof driver should still be merged.
> > If something is going to build on top of this to do WBEM tools, they'll need that MOF
> > data once someone figures out how to nicely deconstruct it.
> >
> 
> The thing I don't like about my own driver is that, as a WMI device
> driver, it can be loaded before the rest of the bus finishes probing.
> So user programs that are notified asynchronously that the wmi-mof
> driver is loaded and try to use future functionality (ioctl to issue a
> MOF-based method call?) might end up doing so before the rest of the
> bus is probed.
> 
> This could be addressed by always exposing the wmi-mof device last
> (sort of -- it can be a module) or perhaps by moving MOF functionality
> to the core driver.  Or maybe it's not really a problem.

Thanks Andy, I'll keep that in mind and see if I can come up with something to
address it while working on WMI this week.

The other problem with wmi-mof is that there will be no immediate open source
consumers of the interface, and none on the horizon. We can't even test it to
any meaningful degree on Linux. I suspect this will be met with stiff
resistance.

> 
> Also, isn't there a way to ask Microsoft to document this?  Are you
> supposed to "ask a question" on this forum, perhaps:
> 
> https://msdn.microsoft.com/en-us/library/gg134029.aspx
> 
> I'm guessing the Samba team knows how to do this, too.
> 

It's a start.

-- 
Darren Hart
VMware Open Source Technology Center