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SubjectRE: [PATCH AUTOSEL for 4.4 093/167] ACPICA: Recognize the Windows 10 version 1607 and 1703 OSI strings
Date
> -----Original Message-----
> From: Moore, Robert [mailto:robert.moore@intel.com]
> Sent: Wednesday, March 28, 2018 2:53 PM
> To: Limonciello, Mario <Mario_Limonciello@Dell.com>;
> Alexander.Levin@microsoft.com; linux-kernel@vger.kernel.org;
> stable@vger.kernel.org
> Cc: Schmauss, Erik <erik.schmauss@intel.com>; Wysocki, Rafael J
> <rafael.j.wysocki@intel.com>
> Subject: RE: [PATCH AUTOSEL for 4.4 093/167] ACPICA: Recognize the Windows 10
> version 1607 and 1703 OSI strings
>
>
>
> > -----Original Message-----
> > From: Mario.Limonciello@dell.com [mailto:Mario.Limonciello@dell.com]
> > Sent: Wednesday, March 28, 2018 10:18 AM
> > To: Moore, Robert <robert.moore@intel.com>;
> > Alexander.Levin@microsoft.com; linux-kernel@vger.kernel.org;
> > stable@vger.kernel.org
> > Cc: Schmauss, Erik <erik.schmauss@intel.com>; Wysocki, Rafael J
> > <rafael.j.wysocki@intel.com>
> > Subject: RE: [PATCH AUTOSEL for 4.4 093/167] ACPICA: Recognize the
> > Windows 10 version 1607 and 1703 OSI strings
> >
> > > -----Original Message-----
> > > From: Moore, Robert [mailto:robert.moore@intel.com]
> > > Sent: Wednesday, March 28, 2018 12:16 PM
> > > To: Limonciello, Mario <Mario_Limonciello@Dell.com>;
> > > Alexander.Levin@microsoft.com; linux-kernel@vger.kernel.org;
> > > stable@vger.kernel.org
> > > Cc: Schmauss, Erik <erik.schmauss@intel.com>; Wysocki, Rafael J
> > > <rafael.j.wysocki@intel.com>
> > > Subject: RE: [PATCH AUTOSEL for 4.4 093/167] ACPICA: Recognize the
> > > Windows 10 version 1607 and 1703 OSI strings
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: Mario.Limonciello@dell.com [mailto:Mario.Limonciello@dell.com]
> > > > Sent: Monday, March 26, 2018 12:30 AM
> > > > To: Alexander.Levin@microsoft.com; linux-kernel@vger.kernel.org;
> > > > stable@vger.kernel.org
> > > > Cc: Moore, Robert <robert.moore@intel.com>; Schmauss, Erik
> > > > <erik.schmauss@intel.com>; Wysocki, Rafael J
> > > > <rafael.j.wysocki@intel.com>
> > > > Subject: RE: [PATCH AUTOSEL for 4.4 093/167] ACPICA: Recognize the
> > > > Windows 10 version 1607 and 1703 OSI strings
> > > >
> > > > > -----Original Message-----
> > > > > From: Sasha Levin [mailto:Alexander.Levin@microsoft.com]
> > > > > Sent: Monday, March 19, 2018 11:07 AM
> > > > > To: linux-kernel@vger.kernel.org; stable@vger.kernel.org
> > > > > Cc: Limonciello, Mario <Mario_Limonciello@Dell.com>; Bob Moore
> > > > > <robert.moore@intel.com>; Erik Schmauss <erik.schmauss@intel.com>;
> > > > Rafael J .
> > > > > Wysocki <rafael.j.wysocki@intel.com>; Sasha Levin
> > > > > <Alexander.Levin@microsoft.com>
> > > > > Subject: [PATCH AUTOSEL for 4.4 093/167] ACPICA: Recognize the
> > > > > Windows
> > > > > 10 version 1607 and 1703 OSI strings
> > > > >
> > > > > From: Mario Limonciello <mario.limonciello@dell.com>
> > > > >
> > > > > [ Upstream commit bc4d413a819f9d0764a80a55875a5d7e1f4efed4 ]
> > > > >
> > > > > ACPICA commit 35a4a3ea723b3066f575e63e5f0116f7ce65e713
> > > > >
> > > > > The public Microsoft document listing recognized OSI strings [1]
> > > > > shows that these two strings were introduced.
> > > > > version 1607 / Anniversary Update / "Redstone 1"
> > > > > version 1703 / Creators Update / "Redstone 2"
> > > > >
> > > > > [1]
> > > > > http://download.microsoft.com/download/7/e/7/7e7662cf-cbea-470b-a9
> > > > > 7e-
> > > > > ce7ce0d98dc2/winacpi_osi.docx
> > > > >
> > > > > Link: https://github.com/acpica/acpica/commit/35a4a3ea
> > > > > Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
> > > > > Signed-off-by: Bob Moore <robert.moore@intel.com>
> > > > > Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
> > > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > > > > Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
> > > > > ---
> > > > > drivers/acpi/acpica/utosi.c | 2 ++
> > > > > include/acpi/actypes.h | 2 ++
> > > > > 2 files changed, 4 insertions(+)
> > > > >
> > > > > diff --git a/drivers/acpi/acpica/utosi.c
> > > > > b/drivers/acpi/acpica/utosi.c index 8f3d203aed79..51d9011b5b33
> > > > > 100644
> > > > > --- a/drivers/acpi/acpica/utosi.c
> > > > > +++ b/drivers/acpi/acpica/utosi.c
> > > > > @@ -101,6 +101,8 @@ static struct acpi_interface_info
> > > > > acpi_default_supported_interfaces[] = {
> > > > > {"Windows 2012", NULL, 0, ACPI_OSI_WIN_8}, /* Windows 8 and
> > Server
> > > > > 2012 - Added 08/2012 */
> > > > > {"Windows 2013", NULL, 0, ACPI_OSI_WIN_8}, /* Windows 8.1 and
> > > > Server
> > > > > 2012 R2 - Added 01/2014 */
> > > > > {"Windows 2015", NULL, 0, ACPI_OSI_WIN_10}, /* Windows 10
> > -
> > > > Added
> > > > > 03/2015 */
> > > > > + {"Windows 2016", NULL, 0, ACPI_OSI_WIN_10_RS1}, /*
> Windows 10
> > > > > version 1607 - Added 12/2017 */
> > > > > + {"Windows 2017", NULL, 0, ACPI_OSI_WIN_10_RS2}, /*
> Windows 10
> > > > > version 1703 - Added 12/2017 */
> > > > >
> > > > > /* Feature Group Strings */
> > > > >
> > > > > diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h index
> > > > > f914958c4adb..d27bc051f47f 100644
> > > > > --- a/include/acpi/actypes.h
> > > > > +++ b/include/acpi/actypes.h
> > > > > @@ -1284,6 +1284,8 @@ typedef enum {
> > > > > #define ACPI_OSI_WIN_7 0x0B
> > > > > #define ACPI_OSI_WIN_8 0x0C
> > > > > #define ACPI_OSI_WIN_10 0x0D
> > > > > +#define ACPI_OSI_WIN_10_RS1 0x0E
> > > > > +#define ACPI_OSI_WIN_10_RS2 0x0F
> > > > >
> > > > > /* Definitions of file IO */
> > > > >
> > > > > --
> > > > > 2.14.1
> > > >
> > > > I don't believe that it would be a good idea to bring back this
> > > > patch to kernels older than 4.15. These strings do activate some
> > > > extra features in Windows and some BIOS ASL has been written to only
> > > > activate them when the newer Windows versions are detected. I have
> > > > no concerns bringing them to 4.15 though.
> > > >
> > > > Bringing them back to stable may introduce other problems that
> > > > requires backporting additional driver changes too.
> > >
> > > [Moore, Robert]
> > >
> > > There should be no problem with this change concerning older machines.
> > > The firmware on these machines will simply never call _OSI with any
> > > strings newer than when the firmware was written -- including this new
> > one.
> > >
> > > Bob
> >
> > Actually I'm referring to "newer" machines that do have this string in
> > the firmware but the changes in the kernel that are relevant to the
> > string didn't land until newer kernels.
> >
> > I think it's a pretty good risk for regressions on those older stable
> > kernels as such.
>
> I don't think I have heard of any issues like this in the past, but I could be wrong.
> You might look into the past when other new strings have been added to ACPICA.
> We add a new string every 1-2 years, depending when MS releases a new one.
>

I don't believe this has been problematic in the past, but because of Microsoft's
accelerated release model with Windows 10, new strings have been introduced
more frequently for the new versions. You can see that in just the last 2 years
there are 3 new strings across 5 versions of Windows 10.

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