ACPI module-level code (MLC) not working?

ACPI module-level code (MLC) not working?

[Peter Wu]

Hi Lv,

According to some tests, setting acpi_gbl_parse_table_as_term_list to
TRUE does is not effective. The code within the If-block is still not
executed early enough or something else is wrong.

Previously Rick had an issue with an Acer Aspire V7-582PG where the dGPU
could not be powered off and I demonstrated an isolated test case in
http://www.spinics.net/lists/linux-acpi/msg70069.html

In Bartosz's case, the dGPU cannot be powered on (also using nouveau),
preventing suspend from working. Situation is as follows (tested with
Linux 3.16, 4.8.4, 4.9-rc2, 4.9-rc4):

His Lenovo IdeaPad Z510 laptop (BIOS date 2014) enables power resources
and related _PR3 objects under the conditional If(_OSI("Windows 2013")).
Both with and without acpi_gbl_parse_table_as_term_list set to TRUE, the
module-level code is not loaded properly. Via a SSDT override, it was
confirmed that removing the If conditional results in the expected
behavior.

Various details are given in https://github.com/Bumblebee-Project/bbswitch/issues/142
including lots of dmesg logs (see posts at the bottom).
With above MLC flag set (v4.9-rc4): https://pastebin.com/raw/vCEPGezX
With SSDT override (v4.9-rc2): https://pastebin.com/raw/3Fsf2VPU

If you would like a new bugzilla entry or have some patches to test, you
know where to find us :)
-- 
Kind regards,
Peter Wu
https://lekensteyn.nl

RE: ACPI module-level code (MLC) not working?

[Zheng, Lv]

Hi,

> From: Peter Wu [mailto:peter@lekensteyn.nl]
> Subject: ACPI module-level code (MLC) not working?
> 
> Hi Lv,
> 
> According to some tests, setting acpi_gbl_parse_table_as_term_list to
> TRUE does is not effective. The code within the If-block is still not
> executed early enough or something else is wrong.
> 
> Previously Rick had an issue with an Acer Aspire V7-582PG where the dGPU
> could not be powered off and I demonstrated an isolated test case in
> http://www.spinics.net/lists/linux-acpi/msg70069.html
> 
> In Bartosz's case, the dGPU cannot be powered on (also using nouveau),
> preventing suspend from working. Situation is as follows (tested with
> Linux 3.16, 4.8.4, 4.9-rc2, 4.9-rc4):
> 
> His Lenovo IdeaPad Z510 laptop (BIOS date 2014) enables power resources
> and related _PR3 objects under the conditional If(_OSI("Windows 2013")).
> Both with and without acpi_gbl_parse_table_as_term_list set to TRUE, the
> module-level code is not loaded properly. Via a SSDT override, it was
> confirmed that removing the If conditional results in the expected
> behavior.
> 
> Various details are given in https://github.com/Bumblebee-Project/bbswitch/issues/142
> including lots of dmesg logs (see posts at the bottom).
> With above MLC flag set (v4.9-rc4): https://pastebin.com/raw/vCEPGezX
> With SSDT override (v4.9-rc2): https://pastebin.com/raw/3Fsf2VPU

I checked the post.
It seems the current working way is: disabling _OSI(Windows 2013) which disables power resources.

I have several questions related to this issue:
1. The following messages are prompt up when "acpi_gbl_parse_table_as_term_list = TRUE":
[    2.519113] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure, AE_NOT_FOUND (20160831/psargs-359)
[    2.519121] ACPI Error: Method parse/execution failed [\_SB.PCI0.PEG1.PEGP.DD02._BCL] (Node ffff8802568d3cf8), AE_NOT_FOUND (20160831/psparse-543)
How was this triggered?

2. I noticed the following statement:
   So, for some reason Lenovo has decided to give all tables the same name.
   The ACPI table override functionality matches possible candidates by signature, OEM ID and OEM Revision ID which are all the same.
   As a result, the wrong SSDT is overridden.
Could you provide the detail of the tables from the platform?
What is the reason of doing such kind of craps in BIOS?

Thanks and best regards
Lv

> 
> If you would like a new bugzilla entry or have some patches to test, you
> know where to find us :)
> --
> Kind regards,
> Peter Wu
> https://lekensteyn.nl

Re: ACPI module-level code (MLC) not working?

[Peter Wu]

On Tue, Nov 08, 2016 at 05:35:07PM +0000, Zheng, Lv wrote:
> Hi,
> 
> > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > Subject: ACPI module-level code (MLC) not working?
> > 
> > Hi Lv,
> > 
> > According to some tests, setting acpi_gbl_parse_table_as_term_list to
> > TRUE does is not effective. The code within the If-block is still not
> > executed early enough or something else is wrong.
> > 
> > Previously Rick had an issue with an Acer Aspire V7-582PG where the dGPU
> > could not be powered off and I demonstrated an isolated test case in
> > http://www.spinics.net/lists/linux-acpi/msg70069.html
> > 
> > In Bartosz's case, the dGPU cannot be powered on (also using nouveau),
> > preventing suspend from working. Situation is as follows (tested with
> > Linux 3.16, 4.8.4, 4.9-rc2, 4.9-rc4):
> > 
> > His Lenovo IdeaPad Z510 laptop (BIOS date 2014) enables power resources
> > and related _PR3 objects under the conditional If(_OSI("Windows 2013")).
> > Both with and without acpi_gbl_parse_table_as_term_list set to TRUE, the
> > module-level code is not loaded properly. Via a SSDT override, it was
> > confirmed that removing the If conditional results in the expected
> > behavior.
> > 
> > Various details are given in https://github.com/Bumblebee-Project/bbswitch/issues/142
> > including lots of dmesg logs (see posts at the bottom).
> > With above MLC flag set (v4.9-rc4): https://pastebin.com/raw/vCEPGezX
> > With SSDT override (v4.9-rc2): https://pastebin.com/raw/3Fsf2VPU
> 
> I checked the post.
> It seems the current working way is: disabling _OSI(Windows 2013) which disables power resources.

That is how Lenovo probably intended to use it (only add Power Resources
when Windows 8 is detected).

> I have several questions related to this issue:
> 1. The following messages are prompt up when "acpi_gbl_parse_table_as_term_list = TRUE":
> [    2.519113] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure, AE_NOT_FOUND (20160831/psargs-359)
> [    2.519121] ACPI Error: Method parse/execution failed [\_SB.PCI0.PEG1.PEGP.DD02._BCL] (Node ffff8802568d3cf8), AE_NOT_FOUND (20160831/psparse-543)
> How was this triggered?

This comes from acpi_video.c, ssdt4.dsl contains a \_SB.PCI0.GFX0.DD02
device with an _ADR method, but no _BCL one. It is not a regression
though, let's ignore this for now.

> 2. I noticed the following statement:
>    So, for some reason Lenovo has decided to give all tables the same name.
>    The ACPI table override functionality matches possible candidates by signature, OEM ID and OEM Revision ID which are all the same.
>    As a result, the wrong SSDT is overridden.
> Could you provide the detail of the tables from the platform?
> What is the reason of doing such kind of craps in BIOS?

I have no idea why Lenovo would do such a silly thing, but that is why
we had to patch tables.c with:

    if (existing_table->checksum != 0xAF) {
        acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
        pr_info("Skipping next table\n");
        goto next_table;
    }

This is of course an unacceptable hard-coded value, but it was needed in
as a quick hack. For a longterm solution, maybe we can name the table
files specially such that additional match conditions can be given. This
is a different issue though.

What would you like to know about the platform? The acpidump is
available at
https://bugs.launchpad.net/lpbugreporter/+bug/752542/+attachment/4773050/+files/LENOVO-20287.tar.gz

ssdt5.dsl is the file of interest, grep for "Windows 2013".

Kind regards,
Peter

> Thanks and best regards
> Lv
> 
> > 
> > If you would like a new bugzilla entry or have some patches to test, you
> > know where to find us :)
> > --
> > Kind regards,
> > Peter Wu
> > https://lekensteyn.nl

RE: ACPI module-level code (MLC) not working?

[Zheng, Lv]

Hi,

> From: Peter Wu [mailto:peter@lekensteyn.nl]
> Subject: Re: ACPI module-level code (MLC) not working?
> 
> On Tue, Nov 08, 2016 at 05:35:07PM +0000, Zheng, Lv wrote:
> > Hi,
> >
> > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > Subject: ACPI module-level code (MLC) not working?
> > >
> > > Hi Lv,
> > >
> > > According to some tests, setting acpi_gbl_parse_table_as_term_list to
> > > TRUE does is not effective. The code within the If-block is still not
> > > executed early enough or something else is wrong.
> > >
> > > Previously Rick had an issue with an Acer Aspire V7-582PG where the dGPU
> > > could not be powered off and I demonstrated an isolated test case in
> > > http://www.spinics.net/lists/linux-acpi/msg70069.html
> > >
> > > In Bartosz's case, the dGPU cannot be powered on (also using nouveau),
> > > preventing suspend from working. Situation is as follows (tested with
> > > Linux 3.16, 4.8.4, 4.9-rc2, 4.9-rc4):
> > >
> > > His Lenovo IdeaPad Z510 laptop (BIOS date 2014) enables power resources
> > > and related _PR3 objects under the conditional If(_OSI("Windows 2013")).
> > > Both with and without acpi_gbl_parse_table_as_term_list set to TRUE, the
> > > module-level code is not loaded properly. Via a SSDT override, it was
> > > confirmed that removing the If conditional results in the expected
> > > behavior.
> > >
> > > Various details are given in https://github.com/Bumblebee-Project/bbswitch/issues/142
> > > including lots of dmesg logs (see posts at the bottom).
> > > With above MLC flag set (v4.9-rc4): https://pastebin.com/raw/vCEPGezX
> > > With SSDT override (v4.9-rc2): https://pastebin.com/raw/3Fsf2VPU
> >
> > I checked the post.
> > It seems the current working way is: disabling _OSI(Windows 2013) which disables power resources.
> 
> That is how Lenovo probably intended to use it (only add Power Resources
> when Windows 8 is detected).
> 
> > I have several questions related to this issue:
> > 1. The following messages are prompt up when "acpi_gbl_parse_table_as_term_list = TRUE":
> > [    2.519113] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure, AE_NOT_FOUND
> (20160831/psargs-359)
> > [    2.519121] ACPI Error: Method parse/execution failed [\_SB.PCI0.PEG1.PEGP.DD02._BCL] (Node
> ffff8802568d3cf8), AE_NOT_FOUND (20160831/psparse-543)
> > How was this triggered?
> 
> This comes from acpi_video.c, ssdt4.dsl contains a \_SB.PCI0.GFX0.DD02
> device with an _ADR method, but no _BCL one. It is not a regression
> though, let's ignore this for now.
> 
> > 2. I noticed the following statement:
> >    So, for some reason Lenovo has decided to give all tables the same name.
> >    The ACPI table override functionality matches possible candidates by signature, OEM ID and OEM
> Revision ID which are all the same.
> >    As a result, the wrong SSDT is overridden.
> > Could you provide the detail of the tables from the platform?
> > What is the reason of doing such kind of craps in BIOS?
> 
> I have no idea why Lenovo would do such a silly thing, but that is why
> we had to patch tables.c with:
> 
>     if (existing_table->checksum != 0xAF) {
>         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
>         pr_info("Skipping next table\n");
>         goto next_table;
>     }
> 
> This is of course an unacceptable hard-coded value, but it was needed in
> as a quick hack. For a longterm solution, maybe we can name the table
> files specially such that additional match conditions can be given. This
> is a different issue though.
> 
> What would you like to know about the platform? The acpidump is
> available at
> https://bugs.launchpad.net/lpbugreporter/+bug/752542/+attachment/4773050/+files/LENOVO-20287.tar.gz
> 
> ssdt5.dsl is the file of interest, grep for "Windows 2013".

The table headers are:

DefinitionBlock ("dsdt.aml", "DSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
DefinitionBlock ("ssdt1.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
DefinitionBlock ("ssdt2.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
DefinitionBlock ("ssdt3.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
DefinitionBlock ("ssdt4.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
DefinitionBlock ("ssdt5.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)

They will be deemed as different versions of the same table from linux ACPI's point of view.
Whether override will be done or not depends on Linux version.
In recent Linux, ssdt1.aml will be used (no override), while in old Linux, ssdt5.aml will be used (override).

Let me ask further.
1. Should OSPM load only ssdt5.aml or load only ssdt1.aml, or load ssdt1.aml,ssdt2.aml,ssdt3.aml,ssdt4.aml,ssdt5.aml?
2. Can you confirm Windows behavior here via amli?

Anyway, this is a special case that violates spec and seems to be aiming to trigger regressions against changed logic brought by me.
No matter whether the change is reasonable.

Linux only need a quirk for this platform.

Thanks
Lv

> 
> Kind regards,
> Peter
> 
> > Thanks and best regards
> > Lv
> >
> > >
> > > If you would like a new bugzilla entry or have some patches to test, you
> > > know where to find us :)
> > > --
> > > Kind regards,
> > > Peter Wu
> > > https://lekensteyn.nl

Re: ACPI module-level code (MLC) not working?

[Peter Wu]

On Wed, Nov 09, 2016 at 12:07:47AM +0000, Zheng, Lv wrote:
> Hi,
> 
> > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > Subject: Re: ACPI module-level code (MLC) not working?
> > 
> > On Tue, Nov 08, 2016 at 05:35:07PM +0000, Zheng, Lv wrote:
> > > Hi,
> > >
> > > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > > Subject: ACPI module-level code (MLC) not working?
> > > >
> > > > Hi Lv,
> > > >
> > > > According to some tests, setting acpi_gbl_parse_table_as_term_list to
> > > > TRUE does is not effective. The code within the If-block is still not
> > > > executed early enough or something else is wrong.
> > > >
> > > > Previously Rick had an issue with an Acer Aspire V7-582PG where the dGPU
> > > > could not be powered off and I demonstrated an isolated test case in
> > > > http://www.spinics.net/lists/linux-acpi/msg70069.html
> > > >
> > > > In Bartosz's case, the dGPU cannot be powered on (also using nouveau),
> > > > preventing suspend from working. Situation is as follows (tested with
> > > > Linux 3.16, 4.8.4, 4.9-rc2, 4.9-rc4):
> > > >
> > > > His Lenovo IdeaPad Z510 laptop (BIOS date 2014) enables power resources
> > > > and related _PR3 objects under the conditional If(_OSI("Windows 2013")).
> > > > Both with and without acpi_gbl_parse_table_as_term_list set to TRUE, the
> > > > module-level code is not loaded properly. Via a SSDT override, it was
> > > > confirmed that removing the If conditional results in the expected
> > > > behavior.
> > > >
> > > > Various details are given in https://github.com/Bumblebee-Project/bbswitch/issues/142
> > > > including lots of dmesg logs (see posts at the bottom).
> > > > With above MLC flag set (v4.9-rc4): https://pastebin.com/raw/vCEPGezX
> > > > With SSDT override (v4.9-rc2): https://pastebin.com/raw/3Fsf2VPU
> > >
> > > I checked the post.
> > > It seems the current working way is: disabling _OSI(Windows 2013) which disables power resources.
> > 
> > That is how Lenovo probably intended to use it (only add Power Resources
> > when Windows 8 is detected).
> > 
> > > I have several questions related to this issue:
> > > 1. The following messages are prompt up when "acpi_gbl_parse_table_as_term_list = TRUE":
> > > [    2.519113] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure, AE_NOT_FOUND
> > (20160831/psargs-359)
> > > [    2.519121] ACPI Error: Method parse/execution failed [\_SB.PCI0.PEG1.PEGP.DD02._BCL] (Node
> > ffff8802568d3cf8), AE_NOT_FOUND (20160831/psparse-543)
> > > How was this triggered?
> > 
> > This comes from acpi_video.c, ssdt4.dsl contains a \_SB.PCI0.GFX0.DD02
> > device with an _ADR method, but no _BCL one. It is not a regression
> > though, let's ignore this for now.
> > 
> > > 2. I noticed the following statement:
> > >    So, for some reason Lenovo has decided to give all tables the same name.
> > >    The ACPI table override functionality matches possible candidates by signature, OEM ID and OEM
> > Revision ID which are all the same.
> > >    As a result, the wrong SSDT is overridden.
> > > Could you provide the detail of the tables from the platform?
> > > What is the reason of doing such kind of craps in BIOS?
> > 
> > I have no idea why Lenovo would do such a silly thing, but that is why
> > we had to patch tables.c with:
> > 
> >     if (existing_table->checksum != 0xAF) {
> >         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
> >         pr_info("Skipping next table\n");
> >         goto next_table;
> >     }
> > 
> > This is of course an unacceptable hard-coded value, but it was needed in
> > as a quick hack. For a longterm solution, maybe we can name the table
> > files specially such that additional match conditions can be given. This
> > is a different issue though.
> > 
> > What would you like to know about the platform? The acpidump is
> > available at
> > https://bugs.launchpad.net/lpbugreporter/+bug/752542/+attachment/4773050/+files/LENOVO-20287.tar.gz
> > 
> > ssdt5.dsl is the file of interest, grep for "Windows 2013".
> 
> The table headers are:
> 
> DefinitionBlock ("dsdt.aml", "DSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> DefinitionBlock ("ssdt1.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> DefinitionBlock ("ssdt2.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> DefinitionBlock ("ssdt3.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> DefinitionBlock ("ssdt4.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> DefinitionBlock ("ssdt5.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> 
> They will be deemed as different versions of the same table from linux ACPI's point of view.
> Whether override will be done or not depends on Linux version.

When I mentioned override, I referred to the method described in
Documentation/acpi/method-customizing.txt where any ACPI table can be
overridden via the initrd. Indeed, that method is unable to pick
arbitrary tables when they all have the same ID.

> In recent Linux, ssdt1.aml will be used (no override), while in old Linux, ssdt5.aml will be used (override).

Does this refer to the same override method as described above? The
tables are loaded normally even if they have the same name.

> Let me ask further.
> 1. Should OSPM load only ssdt5.aml or load only ssdt1.aml, or load ssdt1.aml,ssdt2.aml,ssdt3.aml,ssdt4.aml,ssdt5.aml?
> 2. Can you confirm Windows behavior here via amli?
> 
> Anyway, this is a special case that violates spec and seems to be aiming to trigger regressions against changed logic brought by me.
> No matter whether the change is reasonable.

OSPM should load all tables, they are all different. Perhaps you are
confusing this override method with how Linux normally loads tables?
(Aren't the identifiers just used for visual purposes and irrelevant for
normal operation?)

I have not checked Windows, but I would guess that it loads normally.
Otherwise Lenovo QA has really been sleeping.

Kind regards,
Peter

> Linux only need a quirk for this platform.
> 
> Thanks
> Lv
> 
> > 
> > Kind regards,
> > Peter
> > 
> > > Thanks and best regards
> > > Lv
> > >
> > > >
> > > > If you would like a new bugzilla entry or have some patches to test, you
> > > > know where to find us :)
> > > > --
> > > > Kind regards,
> > > > Peter Wu
> > > > https://lekensteyn.nl

RE: ACPI module-level code (MLC) not working?

[Zheng, Lv]

Hi,

> -----Original Message-----
> From: Peter Wu [mailto:peter@lekensteyn.nl]
> Sent: Tuesday, November 8, 2016 4:33 PM
> To: Zheng, Lv <lv.zheng@intel.com>
> Cc: Rick Kerkhof <rick.2889@gmail.com>; Bartosz Skrzypczak <barteks2x@gmail.com>; Moore, Robert
> <robert.moore@intel.com>; linux-acpi@vger.kernel.org
> Subject: Re: ACPI module-level code (MLC) not working?
> 
> On Wed, Nov 09, 2016 at 12:07:47AM +0000, Zheng, Lv wrote:
> > Hi,
> >
> > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > Subject: Re: ACPI module-level code (MLC) not working?
> > >
> > > On Tue, Nov 08, 2016 at 05:35:07PM +0000, Zheng, Lv wrote:
> > > > Hi,
> > > >
> > > > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > > > Subject: ACPI module-level code (MLC) not working?
> > > > >
> > > > > Hi Lv,
> > > > >
> > > > > According to some tests, setting acpi_gbl_parse_table_as_term_list to
> > > > > TRUE does is not effective. The code within the If-block is still not
> > > > > executed early enough or something else is wrong.
> > > > >
> > > > > Previously Rick had an issue with an Acer Aspire V7-582PG where the dGPU
> > > > > could not be powered off and I demonstrated an isolated test case in
> > > > > http://www.spinics.net/lists/linux-acpi/msg70069.html
> > > > >
> > > > > In Bartosz's case, the dGPU cannot be powered on (also using nouveau),
> > > > > preventing suspend from working. Situation is as follows (tested with
> > > > > Linux 3.16, 4.8.4, 4.9-rc2, 4.9-rc4):
> > > > >
> > > > > His Lenovo IdeaPad Z510 laptop (BIOS date 2014) enables power resources
> > > > > and related _PR3 objects under the conditional If(_OSI("Windows 2013")).
> > > > > Both with and without acpi_gbl_parse_table_as_term_list set to TRUE, the
> > > > > module-level code is not loaded properly. Via a SSDT override, it was
> > > > > confirmed that removing the If conditional results in the expected
> > > > > behavior.
> > > > >
> > > > > Various details are given in https://github.com/Bumblebee-Project/bbswitch/issues/142
> > > > > including lots of dmesg logs (see posts at the bottom).
> > > > > With above MLC flag set (v4.9-rc4): https://pastebin.com/raw/vCEPGezX
> > > > > With SSDT override (v4.9-rc2): https://pastebin.com/raw/3Fsf2VPU
> > > >
> > > > I checked the post.
> > > > It seems the current working way is: disabling _OSI(Windows 2013) which disables power resources.
> > >
> > > That is how Lenovo probably intended to use it (only add Power Resources
> > > when Windows 8 is detected).
> > >
> > > > I have several questions related to this issue:
> > > > 1. The following messages are prompt up when "acpi_gbl_parse_table_as_term_list = TRUE":
> > > > [    2.519113] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure, AE_NOT_FOUND
> > > (20160831/psargs-359)
> > > > [    2.519121] ACPI Error: Method parse/execution failed [\_SB.PCI0.PEG1.PEGP.DD02._BCL] (Node
> > > ffff8802568d3cf8), AE_NOT_FOUND (20160831/psparse-543)
> > > > How was this triggered?
> > >
> > > This comes from acpi_video.c, ssdt4.dsl contains a \_SB.PCI0.GFX0.DD02
> > > device with an _ADR method, but no _BCL one. It is not a regression
> > > though, let's ignore this for now.
> > >
> > > > 2. I noticed the following statement:
> > > >    So, for some reason Lenovo has decided to give all tables the same name.
> > > >    The ACPI table override functionality matches possible candidates by signature, OEM ID and
> OEM
> > > Revision ID which are all the same.
> > > >    As a result, the wrong SSDT is overridden.
> > > > Could you provide the detail of the tables from the platform?
> > > > What is the reason of doing such kind of craps in BIOS?
> > >
> > > I have no idea why Lenovo would do such a silly thing, but that is why
> > > we had to patch tables.c with:
> > >
> > >     if (existing_table->checksum != 0xAF) {
> > >         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
> > >         pr_info("Skipping next table\n");
> > >         goto next_table;
> > >     }
> > >
> > > This is of course an unacceptable hard-coded value, but it was needed in
> > > as a quick hack. For a longterm solution, maybe we can name the table
> > > files specially such that additional match conditions can be given. This
> > > is a different issue though.
> > >
> > > What would you like to know about the platform? The acpidump is
> > > available at
> > > https://bugs.launchpad.net/lpbugreporter/+bug/752542/+attachment/4773050/+files/LENOVO-
> 20287.tar.gz
> > >
> > > ssdt5.dsl is the file of interest, grep for "Windows 2013".
> >
> > The table headers are:
> >
> > DefinitionBlock ("dsdt.aml", "DSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > DefinitionBlock ("ssdt1.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > DefinitionBlock ("ssdt2.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > DefinitionBlock ("ssdt3.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > DefinitionBlock ("ssdt4.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > DefinitionBlock ("ssdt5.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> >
> > They will be deemed as different versions of the same table from linux ACPI's point of view.
> > Whether override will be done or not depends on Linux version.
> 
> When I mentioned override, I referred to the method described in
> Documentation/acpi/method-customizing.txt where any ACPI table can be
> overridden via the initrd. Indeed, that method is unable to pick
> arbitrary tables when they all have the same ID.
> 
> > In recent Linux, ssdt1.aml will be used (no override), while in old Linux, ssdt5.aml will be used
> (override).
> 
> Does this refer to the same override method as described above? The
> tables are loaded normally even if they have the same name.
> 
> > Let me ask further.
> > 1. Should OSPM load only ssdt5.aml or load only ssdt1.aml, or load
> ssdt1.aml,ssdt2.aml,ssdt3.aml,ssdt4.aml,ssdt5.aml?
> > 2. Can you confirm Windows behavior here via amli?
> >
> > Anyway, this is a special case that violates spec and seems to be aiming to trigger regressions
> against changed logic brought by me.
> > No matter whether the change is reasonable.
> 
> OSPM should load all tables, they are all different. Perhaps you are
> confusing this override method with how Linux normally loads tables?
> (Aren't the identifiers just used for visual purposes and irrelevant for
> normal operation?)

No, I'm not confusing it.
I want to know the exact behavior here.

Because I'm actually about to change acpi_tb_compare_tables().
This allows and acpi_install_table() invocations to override matched tables.
So I'll remove Linux table override callback.

Please see my recent comment in the following link:
https://github.com/Bumblebee-Project/bbswitch/issues/142

Thanks
Lv

> 
> I have not checked Windows, but I would guess that it loads normally.
> Otherwise Lenovo QA has really been sleeping.
> 
> Kind regards,
> Peter
> 
> > Linux only need a quirk for this platform.
> >
> > Thanks
> > Lv
> >
> > >
> > > Kind regards,
> > > Peter
> > >
> > > > Thanks and best regards
> > > > Lv
> > > >
> > > > >
> > > > > If you would like a new bugzilla entry or have some patches to test, you
> > > > > know where to find us :)
> > > > > --
> > > > > Kind regards,
> > > > > Peter Wu
> > > > > https://lekensteyn.nl

Re: ACPI module-level code (MLC) not working?

[Peter Wu]

On Wed, Nov 09, 2016 at 12:43:37AM +0000, Zheng, Lv wrote:
> Hi,
> 
> > -----Original Message-----
> > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > Sent: Tuesday, November 8, 2016 4:33 PM
> > To: Zheng, Lv <lv.zheng@intel.com>
> > Cc: Rick Kerkhof <rick.2889@gmail.com>; Bartosz Skrzypczak <barteks2x@gmail.com>; Moore, Robert
> > <robert.moore@intel.com>; linux-acpi@vger.kernel.org
> > Subject: Re: ACPI module-level code (MLC) not working?
> > 
> > On Wed, Nov 09, 2016 at 12:07:47AM +0000, Zheng, Lv wrote:
> > > Hi,
> > >
> > > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > > Subject: Re: ACPI module-level code (MLC) not working?
> > > >
> > > > On Tue, Nov 08, 2016 at 05:35:07PM +0000, Zheng, Lv wrote:
> > > > > Hi,
> > > > >
> > > > > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > > > > Subject: ACPI module-level code (MLC) not working?
> > > > > >
> > > > > > Hi Lv,
> > > > > >
> > > > > > According to some tests, setting acpi_gbl_parse_table_as_term_list to
> > > > > > TRUE does is not effective. The code within the If-block is still not
> > > > > > executed early enough or something else is wrong.
> > > > > >
> > > > > > Previously Rick had an issue with an Acer Aspire V7-582PG where the dGPU
> > > > > > could not be powered off and I demonstrated an isolated test case in
> > > > > > http://www.spinics.net/lists/linux-acpi/msg70069.html
> > > > > >
> > > > > > In Bartosz's case, the dGPU cannot be powered on (also using nouveau),
> > > > > > preventing suspend from working. Situation is as follows (tested with
> > > > > > Linux 3.16, 4.8.4, 4.9-rc2, 4.9-rc4):
> > > > > >
> > > > > > His Lenovo IdeaPad Z510 laptop (BIOS date 2014) enables power resources
> > > > > > and related _PR3 objects under the conditional If(_OSI("Windows 2013")).
> > > > > > Both with and without acpi_gbl_parse_table_as_term_list set to TRUE, the
> > > > > > module-level code is not loaded properly. Via a SSDT override, it was
> > > > > > confirmed that removing the If conditional results in the expected
> > > > > > behavior.
> > > > > >
> > > > > > Various details are given in https://github.com/Bumblebee-Project/bbswitch/issues/142
> > > > > > including lots of dmesg logs (see posts at the bottom).
> > > > > > With above MLC flag set (v4.9-rc4): https://pastebin.com/raw/vCEPGezX
> > > > > > With SSDT override (v4.9-rc2): https://pastebin.com/raw/3Fsf2VPU
> > > > >
> > > > > I checked the post.
> > > > > It seems the current working way is: disabling _OSI(Windows 2013) which disables power resources.
> > > >
> > > > That is how Lenovo probably intended to use it (only add Power Resources
> > > > when Windows 8 is detected).
> > > >
> > > > > I have several questions related to this issue:
> > > > > 1. The following messages are prompt up when "acpi_gbl_parse_table_as_term_list = TRUE":
> > > > > [    2.519113] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure, AE_NOT_FOUND
> > > > (20160831/psargs-359)
> > > > > [    2.519121] ACPI Error: Method parse/execution failed [\_SB.PCI0.PEG1.PEGP.DD02._BCL] (Node
> > > > ffff8802568d3cf8), AE_NOT_FOUND (20160831/psparse-543)
> > > > > How was this triggered?
> > > >
> > > > This comes from acpi_video.c, ssdt4.dsl contains a \_SB.PCI0.GFX0.DD02
> > > > device with an _ADR method, but no _BCL one. It is not a regression
> > > > though, let's ignore this for now.
> > > >
> > > > > 2. I noticed the following statement:
> > > > >    So, for some reason Lenovo has decided to give all tables the same name.
> > > > >    The ACPI table override functionality matches possible candidates by signature, OEM ID and
> > OEM
> > > > Revision ID which are all the same.
> > > > >    As a result, the wrong SSDT is overridden.
> > > > > Could you provide the detail of the tables from the platform?
> > > > > What is the reason of doing such kind of craps in BIOS?
> > > >
> > > > I have no idea why Lenovo would do such a silly thing, but that is why
> > > > we had to patch tables.c with:
> > > >
> > > >     if (existing_table->checksum != 0xAF) {
> > > >         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
> > > >         pr_info("Skipping next table\n");
> > > >         goto next_table;
> > > >     }
> > > >
> > > > This is of course an unacceptable hard-coded value, but it was needed in
> > > > as a quick hack. For a longterm solution, maybe we can name the table
> > > > files specially such that additional match conditions can be given. This
> > > > is a different issue though.
> > > >
> > > > What would you like to know about the platform? The acpidump is
> > > > available at
> > > > https://bugs.launchpad.net/lpbugreporter/+bug/752542/+attachment/4773050/+files/LENOVO-
> > 20287.tar.gz
> > > >
> > > > ssdt5.dsl is the file of interest, grep for "Windows 2013".
> > >
> > > The table headers are:
> > >
> > > DefinitionBlock ("dsdt.aml", "DSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > DefinitionBlock ("ssdt1.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > DefinitionBlock ("ssdt2.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > DefinitionBlock ("ssdt3.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > DefinitionBlock ("ssdt4.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > DefinitionBlock ("ssdt5.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > >
> > > They will be deemed as different versions of the same table from linux ACPI's point of view.
> > > Whether override will be done or not depends on Linux version.
> > 
> > When I mentioned override, I referred to the method described in
> > Documentation/acpi/method-customizing.txt where any ACPI table can be
> > overridden via the initrd. Indeed, that method is unable to pick
> > arbitrary tables when they all have the same ID.
> > 
> > > In recent Linux, ssdt1.aml will be used (no override), while in old Linux, ssdt5.aml will be used
> > (override).
> > 
> > Does this refer to the same override method as described above? The
> > tables are loaded normally even if they have the same name.
> > 
> > > Let me ask further.
> > > 1. Should OSPM load only ssdt5.aml or load only ssdt1.aml, or load
> > ssdt1.aml,ssdt2.aml,ssdt3.aml,ssdt4.aml,ssdt5.aml?
> > > 2. Can you confirm Windows behavior here via amli?
> > >
> > > Anyway, this is a special case that violates spec and seems to be aiming to trigger regressions
> > against changed logic brought by me.
> > > No matter whether the change is reasonable.
> > 
> > OSPM should load all tables, they are all different. Perhaps you are
> > confusing this override method with how Linux normally loads tables?
> > (Aren't the identifiers just used for visual purposes and irrelevant for
> > normal operation?)
> 
> No, I'm not confusing it.
> I want to know the exact behavior here.

I am a bit confused about what you would like to know and will try my
best to answer it. In the dmesg without patching the kernel, the first
SSDT is overwritten, all others are left intact. This can be seen in the
dmesg from https://pastebin.com/raw/LuTLQnU1:

    ACPI: MCFG 0x000000009CFF4000 00003C (v01 LENOVO CB-01    00000001 ACPI 00040000)
    ACPI: Table Upgrade: override [SSDT-LENOVO-CB-01   ]
    ACPI: SSDT 0x000000009CFE6000 Physical table override, new table: 0x000000009C2AB000
    ACPI: SSDT 0x000000009C2AB000 003E32 (v01 LENOVO CB-01    00000002 INTL 20160729)
    ACPI: BOOT 0x000000009CFE4000 000028 (v01 LENOVO CB-01    00000001 ACPI 00040000)
    ACPI: LPIT 0x000000009CFE3000 00005C (v01 LENOVO CB-01    00000001 ACPI 00040000)
    ACPI: ASPT 0x000000009CFE1000 000034 (v07 LENOVO CB-01    00000001 ACPI 00040000)
    ACPI: DBGP 0x000000009CFE0000 000034 (v01 LENOVO CB-01    00000001 ACPI 00040000)
    ACPI: SSDT 0x000000009CFD8000 000539 (v01 LENOVO CB-01    00000001 ACPI 00040000)
    ACPI: SSDT 0x000000009CFD7000 000AD8 (v01 LENOVO CB-01    00000001 ACPI 00040000)
    ACPI: SSDT 0x000000009CFD3000 0034C6 (v01 LENOVO CB-01    00000001 ACPI 00040000)
    ACPI: SSDT 0x000000009CFCE000 00399A (v01 LENOVO CB-01    00000001 ACPI 00040000)

> Because I'm actually about to change acpi_tb_compare_tables().
> This allows and acpi_install_table() invocations to override matched tables.
> So I'll remove Linux table override callback.

No idea why you have to change acpi_tb_compare_tables, this is only used
for "reloading" functionality.

There are two calls from ACPICA to Linux in acpi_tb_override_table,
namely acpi_os_table_override (for DSDT override) and
acpi_os_physical_table_override (for others, like SSDT). Did you meant
to refer to these as "callback"?

If you want to adjust the matching functionality, I guess that
acpi_table_initrd_override needs to be modified. The ACPI header cannot
be modified, so you would then have to read the checksum, size or index
based on the filename.

Kind regards,
Peter

> Please see my recent comment in the following link:
> https://github.com/Bumblebee-Project/bbswitch/issues/142
> 
> Thanks
> Lv
> 
> > 
> > I have not checked Windows, but I would guess that it loads normally.
> > Otherwise Lenovo QA has really been sleeping.
> > 
> > Kind regards,
> > Peter
> > 
> > > Linux only need a quirk for this platform.
> > >
> > > Thanks
> > > Lv
> > >
> > > >
> > > > Kind regards,
> > > > Peter
> > > >
> > > > > Thanks and best regards
> > > > > Lv
> > > > >
> > > > > >
> > > > > > If you would like a new bugzilla entry or have some patches to test, you
> > > > > > know where to find us :)
> > > > > > --
> > > > > > Kind regards,
> > > > > > Peter Wu
> > > > > > https://lekensteyn.nl

RE: ACPI module-level code (MLC) not working?

[Zheng, Lv]

Hi,

> From: Peter Wu [mailto:peter@lekensteyn.nl]
> Subject: Re: ACPI module-level code (MLC) not working?
> 
> On Wed, Nov 09, 2016 at 12:43:37AM +0000, Zheng, Lv wrote:
> > Hi,
> >
> > > -----Original Message-----
> > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > Sent: Tuesday, November 8, 2016 4:33 PM
> > > To: Zheng, Lv <lv.zheng@intel.com>
> > > Cc: Rick Kerkhof <rick.2889@gmail.com>; Bartosz Skrzypczak <barteks2x@gmail.com>; Moore, Robert
> > > <robert.moore@intel.com>; linux-acpi@vger.kernel.org
> > > Subject: Re: ACPI module-level code (MLC) not working?
> > >
> > > On Wed, Nov 09, 2016 at 12:07:47AM +0000, Zheng, Lv wrote:
> > > > Hi,
> > > >
> > > > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > > > Subject: Re: ACPI module-level code (MLC) not working?
> > > > >
> > > > > On Tue, Nov 08, 2016 at 05:35:07PM +0000, Zheng, Lv wrote:
> > > > > > Hi,
> > > > > >
> > > > > > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > > > > > Subject: ACPI module-level code (MLC) not working?
> > > > > > >
> > > > > > > Hi Lv,
> > > > > > >
> > > > > > > According to some tests, setting acpi_gbl_parse_table_as_term_list to
> > > > > > > TRUE does is not effective. The code within the If-block is still not
> > > > > > > executed early enough or something else is wrong.
> > > > > > >
> > > > > > > Previously Rick had an issue with an Acer Aspire V7-582PG where the dGPU
> > > > > > > could not be powered off and I demonstrated an isolated test case in
> > > > > > > http://www.spinics.net/lists/linux-acpi/msg70069.html
> > > > > > >
> > > > > > > In Bartosz's case, the dGPU cannot be powered on (also using nouveau),
> > > > > > > preventing suspend from working. Situation is as follows (tested with
> > > > > > > Linux 3.16, 4.8.4, 4.9-rc2, 4.9-rc4):
> > > > > > >
> > > > > > > His Lenovo IdeaPad Z510 laptop (BIOS date 2014) enables power resources
> > > > > > > and related _PR3 objects under the conditional If(_OSI("Windows 2013")).
> > > > > > > Both with and without acpi_gbl_parse_table_as_term_list set to TRUE, the
> > > > > > > module-level code is not loaded properly. Via a SSDT override, it was
> > > > > > > confirmed that removing the If conditional results in the expected
> > > > > > > behavior.
> > > > > > >
> > > > > > > Various details are given in https://github.com/Bumblebee-Project/bbswitch/issues/142
> > > > > > > including lots of dmesg logs (see posts at the bottom).
> > > > > > > With above MLC flag set (v4.9-rc4): https://pastebin.com/raw/vCEPGezX
> > > > > > > With SSDT override (v4.9-rc2): https://pastebin.com/raw/3Fsf2VPU
> > > > > >
> > > > > > I checked the post.
> > > > > > It seems the current working way is: disabling _OSI(Windows 2013) which disables power
> resources.
> > > > >
> > > > > That is how Lenovo probably intended to use it (only add Power Resources
> > > > > when Windows 8 is detected).
> > > > >
> > > > > > I have several questions related to this issue:
> > > > > > 1. The following messages are prompt up when "acpi_gbl_parse_table_as_term_list = TRUE":
> > > > > > [    2.519113] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure,
> AE_NOT_FOUND
> > > > > (20160831/psargs-359)
> > > > > > [    2.519121] ACPI Error: Method parse/execution failed [\_SB.PCI0.PEG1.PEGP.DD02._BCL]
> (Node
> > > > > ffff8802568d3cf8), AE_NOT_FOUND (20160831/psparse-543)
> > > > > > How was this triggered?
> > > > >
> > > > > This comes from acpi_video.c, ssdt4.dsl contains a \_SB.PCI0.GFX0.DD02
> > > > > device with an _ADR method, but no _BCL one. It is not a regression
> > > > > though, let's ignore this for now.
> > > > >
> > > > > > 2. I noticed the following statement:
> > > > > >    So, for some reason Lenovo has decided to give all tables the same name.
> > > > > >    The ACPI table override functionality matches possible candidates by signature, OEM ID
> and
> > > OEM
> > > > > Revision ID which are all the same.
> > > > > >    As a result, the wrong SSDT is overridden.
> > > > > > Could you provide the detail of the tables from the platform?
> > > > > > What is the reason of doing such kind of craps in BIOS?
> > > > >
> > > > > I have no idea why Lenovo would do such a silly thing, but that is why
> > > > > we had to patch tables.c with:
> > > > >
> > > > >     if (existing_table->checksum != 0xAF) {
> > > > >         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
> > > > >         pr_info("Skipping next table\n");
> > > > >         goto next_table;
> > > > >     }
> > > > >
> > > > > This is of course an unacceptable hard-coded value, but it was needed in
> > > > > as a quick hack. For a longterm solution, maybe we can name the table
> > > > > files specially such that additional match conditions can be given. This
> > > > > is a different issue though.
> > > > >
> > > > > What would you like to know about the platform? The acpidump is
> > > > > available at
> > > > > https://bugs.launchpad.net/lpbugreporter/+bug/752542/+attachment/4773050/+files/LENOVO-
> > > 20287.tar.gz
> > > > >
> > > > > ssdt5.dsl is the file of interest, grep for "Windows 2013".
> > > >
> > > > The table headers are:
> > > >
> > > > DefinitionBlock ("dsdt.aml", "DSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > > DefinitionBlock ("ssdt1.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > > DefinitionBlock ("ssdt2.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > > DefinitionBlock ("ssdt3.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > > DefinitionBlock ("ssdt4.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > > DefinitionBlock ("ssdt5.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > >
> > > > They will be deemed as different versions of the same table from linux ACPI's point of view.
> > > > Whether override will be done or not depends on Linux version.
> > >
> > > When I mentioned override, I referred to the method described in
> > > Documentation/acpi/method-customizing.txt where any ACPI table can be
> > > overridden via the initrd. Indeed, that method is unable to pick
> > > arbitrary tables when they all have the same ID.
> > >
> > > > In recent Linux, ssdt1.aml will be used (no override), while in old Linux, ssdt5.aml will be
> used
> > > (override).
> > >
> > > Does this refer to the same override method as described above? The
> > > tables are loaded normally even if they have the same name.
> > >
> > > > Let me ask further.
> > > > 1. Should OSPM load only ssdt5.aml or load only ssdt1.aml, or load
> > > ssdt1.aml,ssdt2.aml,ssdt3.aml,ssdt4.aml,ssdt5.aml?
> > > > 2. Can you confirm Windows behavior here via amli?
> > > >
> > > > Anyway, this is a special case that violates spec and seems to be aiming to trigger regressions
> > > against changed logic brought by me.
> > > > No matter whether the change is reasonable.
> > >
> > > OSPM should load all tables, they are all different. Perhaps you are
> > > confusing this override method with how Linux normally loads tables?
> > > (Aren't the identifiers just used for visual purposes and irrelevant for
> > > normal operation?)
> >
> > No, I'm not confusing it.
> > I want to know the exact behavior here.
> 
> I am a bit confused about what you would like to know and will try my
> best to answer it. In the dmesg without patching the kernel, the first
> SSDT is overwritten, all others are left intact. This can be seen in the
> dmesg from https://pastebin.com/raw/LuTLQnU1:
> 
>     ACPI: MCFG 0x000000009CFF4000 00003C (v01 LENOVO CB-01    00000001 ACPI 00040000)
>     ACPI: Table Upgrade: override [SSDT-LENOVO-CB-01   ]
>     ACPI: SSDT 0x000000009CFE6000 Physical table override, new table: 0x000000009C2AB000
>     ACPI: SSDT 0x000000009C2AB000 003E32 (v01 LENOVO CB-01    00000002 INTL 20160729)
>     ACPI: BOOT 0x000000009CFE4000 000028 (v01 LENOVO CB-01    00000001 ACPI 00040000)
>     ACPI: LPIT 0x000000009CFE3000 00005C (v01 LENOVO CB-01    00000001 ACPI 00040000)
>     ACPI: ASPT 0x000000009CFE1000 000034 (v07 LENOVO CB-01    00000001 ACPI 00040000)
>     ACPI: DBGP 0x000000009CFE0000 000034 (v01 LENOVO CB-01    00000001 ACPI 00040000)
>     ACPI: SSDT 0x000000009CFD8000 000539 (v01 LENOVO CB-01    00000001 ACPI 00040000)
>     ACPI: SSDT 0x000000009CFD7000 000AD8 (v01 LENOVO CB-01    00000001 ACPI 00040000)
>     ACPI: SSDT 0x000000009CFD3000 0034C6 (v01 LENOVO CB-01    00000001 ACPI 00040000)
>     ACPI: SSDT 0x000000009CFCE000 00399A (v01 LENOVO CB-01    00000001 ACPI 00040000)
> 
> > Because I'm actually about to change acpi_tb_compare_tables().
> > This allows and acpi_install_table() invocations to override matched tables.
> > So I'll remove Linux table override callback.
> 
> No idea why you have to change acpi_tb_compare_tables, this is only used
> for "reloading" functionality.

acpi_tb_compare_tables() matches entire table now, so reloading is actually not functioning.
It's just there to prevent loading the same table twice.
So if we change this function to match IDs, then reloading can work.

This means if a new table handling by acpi_tb_install_standard_table() matches old table IDs, reloading can happen.
The old table can gets unloaded, and thenew table can gets loaded.

As acpi_install_table() invokes acpi_tb_install_standard_table(), it can trigger table re-loading automatically if acpi_tb_compare_tables() is changed.
So there will be no need to implement 2 override callbacks.
Linux just need to invoke acpi_install_table() to all tables found in initrd.

> 
> There are two calls from ACPICA to Linux in acpi_tb_override_table,
> namely acpi_os_table_override (for DSDT override) and
> acpi_os_physical_table_override (for others, like SSDT). Did you meant
> to refer to these as "callback"?

Yes, if I acpi_tb_compare_tables() is changed, the 2 callbacks becomes useless and can be eliminated.

> 
> If you want to adjust the matching functionality, I guess that
> acpi_table_initrd_override needs to be modified. The ACPI header cannot
> be modified, so you would then have to read the checksum, size or index
> based on the filename.

That sounds really ugly...
Lenovo BIOS developers are really crazy!

Thanks
Lv

> 
> Kind regards,
> Peter
> 
> > Please see my recent comment in the following link:
> > https://github.com/Bumblebee-Project/bbswitch/issues/142
> >
> > Thanks
> > Lv
> >
> > >
> > > I have not checked Windows, but I would guess that it loads normally.
> > > Otherwise Lenovo QA has really been sleeping.
> > >
> > > Kind regards,
> > > Peter
> > >
> > > > Linux only need a quirk for this platform.
> > > >
> > > > Thanks
> > > > Lv
> > > >
> > > > >
> > > > > Kind regards,
> > > > > Peter
> > > > >
> > > > > > Thanks and best regards
> > > > > > Lv
> > > > > >
> > > > > > >
> > > > > > > If you would like a new bugzilla entry or have some patches to test, you
> > > > > > > know where to find us :)
> > > > > > > --
> > > > > > > Kind regards,
> > > > > > > Peter Wu
> > > > > > > https://lekensteyn.nl

RE: ACPI module-level code (MLC) not working?

[Zheng, Lv]

Hi,

> From: Zheng, Lv
> Subject: RE: ACPI module-level code (MLC) not working?
> 
> Hi,
> 
> > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > Subject: Re: ACPI module-level code (MLC) not working?
> >
> > On Wed, Nov 09, 2016 at 12:07:47AM +0000, Zheng, Lv wrote:
> > > Hi,
> > >
> > > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > > Subject: Re: ACPI module-level code (MLC) not working?
> > > >
> > > > On Tue, Nov 08, 2016 at 05:35:07PM +0000, Zheng, Lv wrote:
> > > > > Hi,
> > > > >
> > > > > > From: Peter Wu [mailto:peter@lekensteyn.nl]
> > > > > > Subject: ACPI module-level code (MLC) not working?
> > > > > >
> > > > > > Hi Lv,
> > > > > >
> > > > > > According to some tests, setting acpi_gbl_parse_table_as_term_list to
> > > > > > TRUE does is not effective. The code within the If-block is still not
> > > > > > executed early enough or something else is wrong.
> > > > > >
> > > > > > Previously Rick had an issue with an Acer Aspire V7-582PG where the dGPU
> > > > > > could not be powered off and I demonstrated an isolated test case in
> > > > > > http://www.spinics.net/lists/linux-acpi/msg70069.html
> > > > > >
> > > > > > In Bartosz's case, the dGPU cannot be powered on (also using nouveau),
> > > > > > preventing suspend from working. Situation is as follows (tested with
> > > > > > Linux 3.16, 4.8.4, 4.9-rc2, 4.9-rc4):
> > > > > >
> > > > > > His Lenovo IdeaPad Z510 laptop (BIOS date 2014) enables power resources
> > > > > > and related _PR3 objects under the conditional If(_OSI("Windows 2013")).
> > > > > > Both with and without acpi_gbl_parse_table_as_term_list set to TRUE, the
> > > > > > module-level code is not loaded properly. Via a SSDT override, it was
> > > > > > confirmed that removing the If conditional results in the expected
> > > > > > behavior.
> > > > > >
> > > > > > Various details are given in https://github.com/Bumblebee-Project/bbswitch/issues/142
> > > > > > including lots of dmesg logs (see posts at the bottom).
> > > > > > With above MLC flag set (v4.9-rc4): https://pastebin.com/raw/vCEPGezX
> > > > > > With SSDT override (v4.9-rc2): https://pastebin.com/raw/3Fsf2VPU
> > > > >
> > > > > I checked the post.
> > > > > It seems the current working way is: disabling _OSI(Windows 2013) which disables power
> resources.
> > > >
> > > > That is how Lenovo probably intended to use it (only add Power Resources
> > > > when Windows 8 is detected).
> > > >
> > > > > I have several questions related to this issue:
> > > > > 1. The following messages are prompt up when "acpi_gbl_parse_table_as_term_list = TRUE":
> > > > > [    2.519113] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure, AE_NOT_FOUND
> > > > (20160831/psargs-359)
> > > > > [    2.519121] ACPI Error: Method parse/execution failed [\_SB.PCI0.PEG1.PEGP.DD02._BCL] (Node
> > > > ffff8802568d3cf8), AE_NOT_FOUND (20160831/psparse-543)
> > > > > How was this triggered?
> > > >
> > > > This comes from acpi_video.c, ssdt4.dsl contains a \_SB.PCI0.GFX0.DD02
> > > > device with an _ADR method, but no _BCL one. It is not a regression
> > > > though, let's ignore this for now.
> > > >
> > > > > 2. I noticed the following statement:
> > > > >    So, for some reason Lenovo has decided to give all tables the same name.
> > > > >    The ACPI table override functionality matches possible candidates by signature, OEM ID and
> > OEM
> > > > Revision ID which are all the same.
> > > > >    As a result, the wrong SSDT is overridden.
> > > > > Could you provide the detail of the tables from the platform?
> > > > > What is the reason of doing such kind of craps in BIOS?
> > > >
> > > > I have no idea why Lenovo would do such a silly thing, but that is why
> > > > we had to patch tables.c with:
> > > >
> > > >     if (existing_table->checksum != 0xAF) {
> > > >         acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
> > > >         pr_info("Skipping next table\n");
> > > >         goto next_table;
> > > >     }
> > > >
> > > > This is of course an unacceptable hard-coded value, but it was needed in
> > > > as a quick hack. For a longterm solution, maybe we can name the table
> > > > files specially such that additional match conditions can be given. This
> > > > is a different issue though.
> > > >
> > > > What would you like to know about the platform? The acpidump is
> > > > available at
> > > > https://bugs.launchpad.net/lpbugreporter/+bug/752542/+attachment/4773050/+files/LENOVO-
> > 20287.tar.gz
> > > >
> > > > ssdt5.dsl is the file of interest, grep for "Windows 2013".
> > >
> > > The table headers are:
> > >
> > > DefinitionBlock ("dsdt.aml", "DSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > DefinitionBlock ("ssdt1.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > DefinitionBlock ("ssdt2.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > DefinitionBlock ("ssdt3.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > DefinitionBlock ("ssdt4.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > > DefinitionBlock ("ssdt5.aml", "SSDT", 1, "LENOVO", "CB-01   ", 0x00000001)
> > >
> > > They will be deemed as different versions of the same table from linux ACPI's point of view.
> > > Whether override will be done or not depends on Linux version.
> >
> > When I mentioned override, I referred to the method described in
> > Documentation/acpi/method-customizing.txt where any ACPI table can be
> > overridden via the initrd. Indeed, that method is unable to pick
> > arbitrary tables when they all have the same ID.
> >
> > > In recent Linux, ssdt1.aml will be used (no override), while in old Linux, ssdt5.aml will be used
> > (override).
> >
> > Does this refer to the same override method as described above? The
> > tables are loaded normally even if they have the same name.
> >
> > > Let me ask further.
> > > 1. Should OSPM load only ssdt5.aml or load only ssdt1.aml, or load
> > ssdt1.aml,ssdt2.aml,ssdt3.aml,ssdt4.aml,ssdt5.aml?
> > > 2. Can you confirm Windows behavior here via amli?
> > >
> > > Anyway, this is a special case that violates spec and seems to be aiming to trigger regressions
> > against changed logic brought by me.
> > > No matter whether the change is reasonable.
> >
> > OSPM should load all tables, they are all different. Perhaps you are
> > confusing this override method with how Linux normally loads tables?
> > (Aren't the identifiers just used for visual purposes and irrelevant for
> > normal operation?)
> 
> No, I'm not confusing it.
> I want to know the exact behavior here.
> 
> Because I'm actually about to change acpi_tb_compare_tables().
> This allows and acpi_install_table() invocations to override matched tables.
> So I'll remove Linux table override callback.

I also was about to change /sys/firmware/acpi/tables, renaming tables using the IDs.
This platform makes such cleanup impossible...

Back to the issue, IMO, the bug report is against _OSI support in module level.
I'll check if _OSI can be invoked in module level.

Thanks and best regards
Lv

> 
> Please see my recent comment in the following link:
> https://github.com/Bumblebee-Project/bbswitch/issues/142
> 
> Thanks
> Lv
> 
> >
> > I have not checked Windows, but I would guess that it loads normally.
> > Otherwise Lenovo QA has really been sleeping.
> >
> > Kind regards,
> > Peter
> >
> > > Linux only need a quirk for this platform.
> > >
> > > Thanks
> > > Lv
> > >
> > > >
> > > > Kind regards,
> > > > Peter
> > > >
> > > > > Thanks and best regards
> > > > > Lv
> > > > >
> > > > > >
> > > > > > If you would like a new bugzilla entry or have some patches to test, you
> > > > > > know where to find us :)
> > > > > > --
> > > > > > Kind regards,
> > > > > > Peter Wu
> > > > > > https://lekensteyn.nl