From: Darren Hart <dvhart@infradead.org>
To: Mario.Limonciello@dell.com
Cc: andy.shevchenko@gmail.com, pali.rohar@gmail.com,
linux-kernel@vger.kernel.org,
platform-driver-x86@vger.kernel.org, quasisec@google.com
Subject: Re: [PATCH 06/12] platform/x86: dell-wmi-smbios: Add a sysfs interface for SMBIOS tokens
Date: Wed, 27 Sep 2017 09:50:51 -0700 [thread overview]
Message-ID: <20170927165051.GE23572@fury> (raw)
In-Reply-To: <bb85503730a1479c94810a12802e8027@ausx13mpc120.AMER.DELL.COM>
On Mon, Sep 25, 2017 at 05:31:05PM +0000, Mario.Limonciello@dell.com wrote:
> > -----Original Message-----
> > From: Andy Shevchenko [mailto:andy.shevchenko@gmail.com]
> > Sent: Monday, September 25, 2017 1:04 PM
> > To: Pali Rohár <pali.rohar@gmail.com>
> > Cc: Limonciello, Mario <Mario_Limonciello@Dell.com>; dvhart@infradead.org;
> > LKML <linux-kernel@vger.kernel.org>; Platform Driver <platform-driver-
> > x86@vger.kernel.org>; quasisec@google.com
> > Subject: Re: [PATCH 06/12] platform/x86: dell-wmi-smbios: Add a sysfs interface
> > for SMBIOS tokens
> >
> > On Mon, Sep 25, 2017 at 7:23 PM, Pali Rohár <pali.rohar@gmail.com> wrote:
> > > On Thursday 21 September 2017 08:57:11 Mario Limonciello wrote:
> > >> Currently userspace tools can access system tokens via the dcdbas
> > >> kernel module and a SMI call that will cause the platform to execute
> > >> SMM code.
> > >>
> > >> With a goal in mind of deprecating the dcdbas kernel module a different
> > >> method for accessing these tokens from userspace needs to be created.
> > >>
> > >> This is intentionally marked to only be readable as root as it can
> > >> contain sensitive information about the platform's configuration.
> > >
> > > Darren, Andy, any comments? I'm not quite sure if such API is suitable
> > > for long term in kernel.
> >
> > I would try to avoid sysfs interfaces for some particular devices.
> > Besides we are creating a character device. Would it be suitable there?
>
> If the character device having 2 different ioctls for different needs is
> acceptable I'm happy to adjust the series to do this instead.
One piece of feedback I had re the char device was to see if we could avoid the
need for the IOCTL altogether, I'd like to have that discussion before we add
another.
>
> >
> > > Basically tokens are list of tuples <id, location, value> with
> > > possibility to active them, right?
> > >
>
> I didn't add a way to activate them through this, it was only for
> reading purpose. Activating them should be possible through the
> SMBIOS calling interface though.
>
These are read-only as I understood it, and only with the right privileges.
Sysfs seemed appropriate for this to me.
--
Darren Hart
VMware Open Source Technology Center
next prev parent reply other threads:[~2017-09-27 16:50 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-21 13:57 [PATCH 00/12] Introduce support for Dell SMBIOS over WMI Mario Limonciello
2017-09-21 13:57 ` [PATCH 01/12] platform/x86: dell-wmi: label driver as handling notifications Mario Limonciello
2017-09-25 16:04 ` Pali Rohár
2017-09-25 20:14 ` Mario.Limonciello
2017-09-27 15:43 ` Darren Hart
2017-09-21 13:57 ` [PATCH 02/12] platform/x86: dell-wmi: Don't match on descriptor GUID modalias Mario Limonciello
2017-09-25 16:06 ` Pali Rohár
2017-09-21 13:57 ` [PATCH 03/12] platform/x86: dell-smbios: Add pr_fmt definition to driver Mario Limonciello
2017-09-21 16:22 ` Andy Shevchenko
2017-09-25 16:07 ` Pali Rohár
2017-09-21 13:57 ` [PATCH 04/12] platform/x86: dell-smbios: Switch to a WMI-ACPI interface Mario Limonciello
2017-09-25 16:18 ` Pali Rohár
2017-09-25 19:28 ` Mario.Limonciello
2017-09-27 16:46 ` Darren Hart
2017-09-27 18:29 ` Mario.Limonciello
2017-09-27 19:47 ` Andy Lutomirski
2017-09-27 21:15 ` Mario.Limonciello
2017-09-21 13:57 ` [PATCH 05/12] platform/x86: dell-smbios: rename to dell-wmi-smbios Mario Limonciello
2017-09-21 13:57 ` [PATCH 06/12] platform/x86: dell-wmi-smbios: Add a sysfs interface for SMBIOS tokens Mario Limonciello
2017-09-25 16:23 ` Pali Rohár
2017-09-25 17:04 ` Andy Shevchenko
2017-09-25 17:31 ` Mario.Limonciello
2017-09-27 16:50 ` Darren Hart [this message]
2017-09-27 18:27 ` Mario.Limonciello
2017-09-27 18:31 ` Andy Shevchenko
2017-09-27 18:55 ` Darren Hart
2017-09-27 19:49 ` Andy Lutomirski
2017-09-27 19:50 ` Mario.Limonciello
2017-09-21 13:57 ` [PATCH 07/12] platform/x86: dell-wmi-smbios: Use Dell WMI descriptor check Mario Limonciello
2017-09-21 16:44 ` Andy Shevchenko
2017-09-21 20:56 ` Mario.Limonciello
2017-09-21 13:57 ` [PATCH 08/12] platform/x86: wmi: Cleanup exit routine in reverse order of init Mario Limonciello
2017-09-21 13:57 ` [PATCH 09/12] platform/x86: wmi: create character devices when requested by drivers Mario Limonciello
2017-09-21 16:46 ` Andy Shevchenko
2017-09-21 19:21 ` Mario.Limonciello
2017-09-21 13:57 ` [PATCH 10/12] platform/x86: wmi: destroy on cleanup rather than unregister Mario Limonciello
2017-09-21 13:57 ` [PATCH 11/12] platform/x86: dell-wmi-smbios: introduce character device for userspace Mario Limonciello
2017-09-25 16:31 ` Pali Rohár
2017-09-25 16:58 ` Andy Shevchenko
2017-09-25 17:46 ` Mario.Limonciello
2017-09-27 16:59 ` Darren Hart
2017-09-27 18:10 ` Mario.Limonciello
2017-09-27 18:50 ` Darren Hart
2017-09-27 21:12 ` Mario.Limonciello
2017-09-27 21:59 ` Darren Hart
2017-09-21 13:57 ` [PATCH 12/12] platform/x86: Kconfig: Change the default settings for dell-wmi-smbios Mario Limonciello
2017-09-25 16:13 ` [PATCH 00/12] Introduce support for Dell SMBIOS over WMI Pali Rohár
2017-09-25 16:32 ` Mario.Limonciello
2017-09-25 16:49 ` Pali Rohár
2017-09-25 19:27 ` Mario.Limonciello
2017-09-27 16:39 ` Darren Hart
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170927165051.GE23572@fury \
--to=dvhart@infradead.org \
--cc=Mario.Limonciello@dell.com \
--cc=andy.shevchenko@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=pali.rohar@gmail.com \
--cc=platform-driver-x86@vger.kernel.org \
--cc=quasisec@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox