Re: Info: mapping multiple BARs. Your kernel is fine.

Re: Info: mapping multiple BARs. Your kernel is fine.

[Rafael J. Wysocki]

[CC list rearranged]

On Monday, February 24, 2014 05:24:00 PM Borislav Petkov wrote:
> This started happening this morning after booting -rc4+tip, let's
> add *everybody* to CC :-)
> 
> We have intel_uncore_init, snb_uncore_imc_init_box, uncore_pci_probe and
> other goodies on the stack.

I've just gone throught this.

So the problem is that we have the PNP "system" driver whose only purpose seems
to be to reserve system resources so that the PCI layer doesn't assign them to
new devices on hotplug (disclaimer: I didn't invent it, I only read the code and
comments in there).

It does that for ACPI device objects having the "PNP0C02" and "PNP0C01" IDs.

Apparently, snb_uncore_imc_init_box() steps on a range already reserved by that
driver on your box.  And this doesn't seem to be a coincidence, because the ACPI
device object in question probably *does* correspond to the memory controller
that the uncore driver attempts to use.

I'm not sure how to address that right now to be honest.  Arguably, the PNP
"system" driver should be replaced with something saner, but still the
resources it claims need to be kept out of reach of the PCI's resource
allocation code.

> ...
> [    0.488998] software IO TLB [mem 0xcac30000-0xcec30000] (64MB) mapped at [ffff8800cac30000-ffff8800cec2ffff]
> [    0.489975] resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
> [    0.490079] ------------[ cut here ]------------
> [    0.490204] WARNING: CPU: 2 PID: 1 at arch/x86/mm/ioremap.c:171 __ioremap_caller+0x372/0x380()
> [    0.490306] Info: mapping multiple BARs. Your kernel is fine.
> [    0.490371] Modules linked in:
> [    0.490558] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc4+ #1
> [    0.490642] Hardware name: LENOVO 2320CTO/2320CTO, BIOS G2ET86WW (2.06 ) 11/13/2012
> [    0.490742]  00000000000000ab ffff880213d01ad8 ffffffff816112e3 0000000000000006
> [    0.491032]  ffff880213d01b28 ffff880213d01b18 ffffffff8104e9bc ffff880213d01b08
> [    0.491343]  ffffc90000c58000 00000000fed10000 00000000fed10000 0000000000006000
> [    0.491631] Call Trace:
> [    0.493337]  [<ffffffff816112e3>] dump_stack+0x4f/0x7c
> [    0.493420]  [<ffffffff8104e9bc>] warn_slowpath_common+0x8c/0xc0
> [    0.493503]  [<ffffffff8104eaa6>] warn_slowpath_fmt+0x46/0x50
> [    0.493588]  [<ffffffff8103f1e2>] __ioremap_caller+0x372/0x380
> [    0.493674]  [<ffffffff810211a2>] ? snb_uncore_imc_init_box+0x62/0x90
> [    0.493761]  [<ffffffff8103f247>] ioremap_nocache+0x17/0x20
> [    0.493846]  [<ffffffff810211a2>] snb_uncore_imc_init_box+0x62/0x90
> [    0.493933]  [<ffffffff81022925>] uncore_pci_probe+0xe5/0x1e0
> [    0.494020]  [<ffffffff812d487e>] local_pci_probe+0x4e/0xa0
> [    0.494104]  [<ffffffff81418a59>] ? get_device+0x19/0x20
> [    0.494213]  [<ffffffff812d5cd1>] pci_device_probe+0xe1/0x130
> [    0.494300]  [<ffffffff8141d3cb>] driver_probe_device+0x7b/0x240
> [    0.494385]  [<ffffffff8141d63b>] __driver_attach+0xab/0xb0
> [    0.494469]  [<ffffffff8141d590>] ? driver_probe_device+0x240/0x240
> [    0.494551]  [<ffffffff8141b71e>] bus_for_each_dev+0x5e/0x90
> [    0.494634]  [<ffffffff8141cede>] driver_attach+0x1e/0x20
> [    0.494718]  [<ffffffff8141ca57>] bus_add_driver+0x117/0x230
> [    0.494802]  [<ffffffff8141dd34>] driver_register+0x64/0xf0
> [    0.494884]  [<ffffffff812d4c14>] __pci_register_driver+0x64/0x70
> [    0.494972]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
> [    0.495056]  [<ffffffff81d03312>] intel_uncore_init+0x177/0x41c
> [    0.495155]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
> [    0.495242]  [<ffffffff8100029e>] do_one_initcall+0x4e/0x170
> [    0.495326]  [<ffffffff81071100>] ? parse_args+0x60/0x360
> [    0.495411]  [<ffffffff81cfbfb8>] kernel_init_freeable+0x106/0x19a
> [    0.495497]  [<ffffffff81cfb83b>] ? do_early_param+0x86/0x86
> [    0.495582]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
> [    0.495666]  [<ffffffff81607efe>] kernel_init+0xe/0xf0
> [    0.495749]  [<ffffffff81621f6c>] ret_from_fork+0x7c/0xb0
> [    0.495831]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
> [    0.495921] ---[ end trace 428f365c054d9a01 ]---
> [    0.496196] RAPL PMU detected, hw unit 2^-16 Joules, API unit is 2^-32 Joules, 3 fixed counters 163840 ms ovfl timer
> [    0.498598] futex hash table entries: 1024 (order: 5, 131072 bytes)
> [    0.498833] audit: initializing netlink subsys (disabled)
> [    0.499024] audit: type=2000 audit(1393259866.477:1): initialized
> ...
> 
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.

Re: Info: mapping multiple BARs. Your kernel is fine.

[Borislav Petkov]

On Sat, Mar 15, 2014 at 03:15:04PM +0100, Rafael J. Wysocki wrote:
> I've just gone throught this.

Thanks.

> So the problem is that we have the PNP "system" driver whose only purpose seems
> to be to reserve system resources so that the PCI layer doesn't assign them to
> new devices on hotplug (disclaimer: I didn't invent it, I only read the code and
> comments in there).
> 
> It does that for ACPI device objects having the "PNP0C02" and "PNP0C01" IDs.

Right, pnp 00:01 is PNP0C02.

> Apparently, snb_uncore_imc_init_box() steps on a range already reserved by that
> driver on your box.  And this doesn't seem to be a coincidence, because the ACPI
> device object in question probably *does* correspond to the memory controller
> that the uncore driver attempts to use.
> 
> I'm not sure how to address that right now to be honest.  Arguably, the PNP
> "system" driver should be replaced with something saner, but still the
> resources it claims need to be kept out of reach of the PCI's resource
> allocation code.

Well, I'm only conjecturing here but there should be a way for the
uncore code to tell the PNP "system" driver to free this resource
because uncore is going to use it now. Or something to that effect.

Oh well.

Re: Info: mapping multiple BARs. Your kernel is fine.

[Stephane Eranian]

Rafael,

Thanks for the analysis.

On Sun, Mar 16, 2014 at 12:55 PM, Borislav Petkov <bp@alien8.de> wrote:
> On Sat, Mar 15, 2014 at 03:15:04PM +0100, Rafael J. Wysocki wrote:
>> I've just gone throught this.
>
> Thanks.
>
>> So the problem is that we have the PNP "system" driver whose only purpose seems
>> to be to reserve system resources so that the PCI layer doesn't assign them to
>> new devices on hotplug (disclaimer: I didn't invent it, I only read the code and
>> comments in there).
>>
>> It does that for ACPI device objects having the "PNP0C02" and "PNP0C01" IDs.
>
> Right, pnp 00:01 is PNP0C02.
>
>> Apparently, snb_uncore_imc_init_box() steps on a range already reserved by that
>> driver on your box.  And this doesn't seem to be a coincidence, because the ACPI
>> device object in question probably *does* correspond to the memory controller
>> that the uncore driver attempts to use.
>>
>> I'm not sure how to address that right now to be honest.  Arguably, the PNP
>> "system" driver should be replaced with something saner, but still the
>> resources it claims need to be kept out of reach of the PCI's resource
>> allocation code.
>
> Well, I'm only conjecturing here but there should be a way for the
> uncore code to tell the PNP "system" driver to free this resource
> because uncore is going to use it now. Or something to that effect.
>
I agree. The snb_uncore_imc() is making real (good) use of the device.
It needs to own it. So we need a way to free the resource from the PNP
system or  a way to tell PNP need to grab it on systems with the
snb_uncore_imc() support. Does that kind of API exist?

Where do I look to prevent PNP from grabbing the IMC?

Re: Info: mapping multiple BARs. Your kernel is fine.

[Rafael J. Wysocki]

On Sunday, March 16, 2014 02:08:16 PM Stephane Eranian wrote:
> Rafael,
> 
> Thanks for the analysis.
> 
> On Sun, Mar 16, 2014 at 12:55 PM, Borislav Petkov <bp@alien8.de> wrote:
> > On Sat, Mar 15, 2014 at 03:15:04PM +0100, Rafael J. Wysocki wrote:
> >> I've just gone throught this.
> >
> > Thanks.
> >
> >> So the problem is that we have the PNP "system" driver whose only purpose seems
> >> to be to reserve system resources so that the PCI layer doesn't assign them to
> >> new devices on hotplug (disclaimer: I didn't invent it, I only read the code and
> >> comments in there).
> >>
> >> It does that for ACPI device objects having the "PNP0C02" and "PNP0C01" IDs.
> >
> > Right, pnp 00:01 is PNP0C02.
> >
> >> Apparently, snb_uncore_imc_init_box() steps on a range already reserved by that
> >> driver on your box.  And this doesn't seem to be a coincidence, because the ACPI
> >> device object in question probably *does* correspond to the memory controller
> >> that the uncore driver attempts to use.
> >>
> >> I'm not sure how to address that right now to be honest.  Arguably, the PNP
> >> "system" driver should be replaced with something saner, but still the
> >> resources it claims need to be kept out of reach of the PCI's resource
> >> allocation code.
> >
> > Well, I'm only conjecturing here but there should be a way for the
> > uncore code to tell the PNP "system" driver to free this resource
> > because uncore is going to use it now. Or something to that effect.
> >
> I agree. The snb_uncore_imc() is making real (good) use of the device.
> It needs to own it. So we need a way to free the resource from the PNP
> system or  a way to tell PNP need to grab it on systems with the
> snb_uncore_imc() support. Does that kind of API exist?
> 
> Where do I look to prevent PNP from grabbing the IMC?

drivers/pnp/system.c is the driver in question and system_pnp_probe() makes
the reservations via reserve_resources_of_dev(), so you'd need to modify that.

I'm not sure what's the right way to go here, though.

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.

Re: Info: mapping multiple BARs. Your kernel is fine.

[Rafael J. Wysocki]

On Monday, March 17, 2014 01:09:39 AM Rafael J. Wysocki wrote:
> On Sunday, March 16, 2014 02:08:16 PM Stephane Eranian wrote:
> > Rafael,
> > 
> > Thanks for the analysis.
> > 
> > On Sun, Mar 16, 2014 at 12:55 PM, Borislav Petkov <bp@alien8.de> wrote:
> > > On Sat, Mar 15, 2014 at 03:15:04PM +0100, Rafael J. Wysocki wrote:
> > >> I've just gone throught this.
> > >
> > > Thanks.
> > >
> > >> So the problem is that we have the PNP "system" driver whose only purpose seems
> > >> to be to reserve system resources so that the PCI layer doesn't assign them to
> > >> new devices on hotplug (disclaimer: I didn't invent it, I only read the code and
> > >> comments in there).
> > >>
> > >> It does that for ACPI device objects having the "PNP0C02" and "PNP0C01" IDs.
> > >
> > > Right, pnp 00:01 is PNP0C02.
> > >
> > >> Apparently, snb_uncore_imc_init_box() steps on a range already reserved by that
> > >> driver on your box.  And this doesn't seem to be a coincidence, because the ACPI
> > >> device object in question probably *does* correspond to the memory controller
> > >> that the uncore driver attempts to use.
> > >>
> > >> I'm not sure how to address that right now to be honest.  Arguably, the PNP
> > >> "system" driver should be replaced with something saner, but still the
> > >> resources it claims need to be kept out of reach of the PCI's resource
> > >> allocation code.
> > >
> > > Well, I'm only conjecturing here but there should be a way for the
> > > uncore code to tell the PNP "system" driver to free this resource
> > > because uncore is going to use it now. Or something to that effect.
> > >
> > I agree. The snb_uncore_imc() is making real (good) use of the device.
> > It needs to own it. So we need a way to free the resource from the PNP
> > system or  a way to tell PNP need to grab it on systems with the
> > snb_uncore_imc() support. Does that kind of API exist?
> > 
> > Where do I look to prevent PNP from grabbing the IMC?
> 
> drivers/pnp/system.c is the driver in question and system_pnp_probe() makes
> the reservations via reserve_resources_of_dev(), so you'd need to modify that.
> 
> I'm not sure what's the right way to go here, though.

Boris, can you please sent the acpidump output from that machine?

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.

Re: Info: mapping multiple BARs. Your kernel is fine.

[Aaron Lu]

On 03/15/2014 10:15 PM, Rafael J. Wysocki wrote:
> [CC list rearranged]
> 
> On Monday, February 24, 2014 05:24:00 PM Borislav Petkov wrote:
>> This started happening this morning after booting -rc4+tip, let's
>> add *everybody* to CC :-)
>>
>> We have intel_uncore_init, snb_uncore_imc_init_box, uncore_pci_probe and
>> other goodies on the stack.
> 
> I've just gone throught this.
> 
> So the problem is that we have the PNP "system" driver whose only purpose seems
> to be to reserve system resources so that the PCI layer doesn't assign them to
> new devices on hotplug (disclaimer: I didn't invent it, I only read the code and
> comments in there).

And to PCI devices which have uninitialized BARs.

> 
> It does that for ACPI device objects having the "PNP0C02" and "PNP0C01" IDs.
> 
> Apparently, snb_uncore_imc_init_box() steps on a range already reserved by that
> driver on your box.  And this doesn't seem to be a coincidence, because the ACPI
> device object in question probably *does* correspond to the memory controller
> that the uncore driver attempts to use.
> 
> I'm not sure how to address that right now to be honest.  Arguably, the PNP
> "system" driver should be replaced with something saner, but still the
> resources it claims need to be kept out of reach of the PCI's resource
> allocation code.

The quirk_system_pci_resources is meant to disable PNP devices' resource if
they collide with any known PCI device's BAR. I'm not sure why it doesn't work
here, perhaps the uncore PCI device doesn't have a BAR that falls in the PNP
device's resource window?

Thanks,
Aaron

> 
>> ...
>> [    0.488998] software IO TLB [mem 0xcac30000-0xcec30000] (64MB) mapped at [ffff8800cac30000-ffff8800cec2ffff]
>> [    0.489975] resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
>> [    0.490079] ------------[ cut here ]------------
>> [    0.490204] WARNING: CPU: 2 PID: 1 at arch/x86/mm/ioremap.c:171 __ioremap_caller+0x372/0x380()
>> [    0.490306] Info: mapping multiple BARs. Your kernel is fine.
>> [    0.490371] Modules linked in:
>> [    0.490558] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc4+ #1
>> [    0.490642] Hardware name: LENOVO 2320CTO/2320CTO, BIOS G2ET86WW (2.06 ) 11/13/2012
>> [    0.490742]  00000000000000ab ffff880213d01ad8 ffffffff816112e3 0000000000000006
>> [    0.491032]  ffff880213d01b28 ffff880213d01b18 ffffffff8104e9bc ffff880213d01b08
>> [    0.491343]  ffffc90000c58000 00000000fed10000 00000000fed10000 0000000000006000
>> [    0.491631] Call Trace:
>> [    0.493337]  [<ffffffff816112e3>] dump_stack+0x4f/0x7c
>> [    0.493420]  [<ffffffff8104e9bc>] warn_slowpath_common+0x8c/0xc0
>> [    0.493503]  [<ffffffff8104eaa6>] warn_slowpath_fmt+0x46/0x50
>> [    0.493588]  [<ffffffff8103f1e2>] __ioremap_caller+0x372/0x380
>> [    0.493674]  [<ffffffff810211a2>] ? snb_uncore_imc_init_box+0x62/0x90
>> [    0.493761]  [<ffffffff8103f247>] ioremap_nocache+0x17/0x20
>> [    0.493846]  [<ffffffff810211a2>] snb_uncore_imc_init_box+0x62/0x90
>> [    0.493933]  [<ffffffff81022925>] uncore_pci_probe+0xe5/0x1e0
>> [    0.494020]  [<ffffffff812d487e>] local_pci_probe+0x4e/0xa0
>> [    0.494104]  [<ffffffff81418a59>] ? get_device+0x19/0x20
>> [    0.494213]  [<ffffffff812d5cd1>] pci_device_probe+0xe1/0x130
>> [    0.494300]  [<ffffffff8141d3cb>] driver_probe_device+0x7b/0x240
>> [    0.494385]  [<ffffffff8141d63b>] __driver_attach+0xab/0xb0
>> [    0.494469]  [<ffffffff8141d590>] ? driver_probe_device+0x240/0x240
>> [    0.494551]  [<ffffffff8141b71e>] bus_for_each_dev+0x5e/0x90
>> [    0.494634]  [<ffffffff8141cede>] driver_attach+0x1e/0x20
>> [    0.494718]  [<ffffffff8141ca57>] bus_add_driver+0x117/0x230
>> [    0.494802]  [<ffffffff8141dd34>] driver_register+0x64/0xf0
>> [    0.494884]  [<ffffffff812d4c14>] __pci_register_driver+0x64/0x70
>> [    0.494972]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
>> [    0.495056]  [<ffffffff81d03312>] intel_uncore_init+0x177/0x41c
>> [    0.495155]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
>> [    0.495242]  [<ffffffff8100029e>] do_one_initcall+0x4e/0x170
>> [    0.495326]  [<ffffffff81071100>] ? parse_args+0x60/0x360
>> [    0.495411]  [<ffffffff81cfbfb8>] kernel_init_freeable+0x106/0x19a
>> [    0.495497]  [<ffffffff81cfb83b>] ? do_early_param+0x86/0x86
>> [    0.495582]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
>> [    0.495666]  [<ffffffff81607efe>] kernel_init+0xe/0xf0
>> [    0.495749]  [<ffffffff81621f6c>] ret_from_fork+0x7c/0xb0
>> [    0.495831]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
>> [    0.495921] ---[ end trace 428f365c054d9a01 ]---
>> [    0.496196] RAPL PMU detected, hw unit 2^-16 Joules, API unit is 2^-32 Joules, 3 fixed counters 163840 ms ovfl timer
>> [    0.498598] futex hash table entries: 1024 (order: 5, 131072 bytes)
>> [    0.498833] audit: initializing netlink subsys (disabled)
>> [    0.499024] audit: type=2000 audit(1393259866.477:1): initialized
>> ...
>>
>>
> 

Re: Info: mapping multiple BARs. Your kernel is fine.

[Stephane Eranian]

On Thu, Mar 20, 2014 at 3:24 AM, Aaron Lu <aaron.lu@intel.com> wrote:
> On 03/15/2014 10:15 PM, Rafael J. Wysocki wrote:
>> [CC list rearranged]
>>
>> On Monday, February 24, 2014 05:24:00 PM Borislav Petkov wrote:
>>> This started happening this morning after booting -rc4+tip, let's
>>> add *everybody* to CC :-)
>>>
>>> We have intel_uncore_init, snb_uncore_imc_init_box, uncore_pci_probe and
>>> other goodies on the stack.
>>
>> I've just gone throught this.
>>
>> So the problem is that we have the PNP "system" driver whose only purpose seems
>> to be to reserve system resources so that the PCI layer doesn't assign them to
>> new devices on hotplug (disclaimer: I didn't invent it, I only read the code and
>> comments in there).
>
> And to PCI devices which have uninitialized BARs.
>
>>
>> It does that for ACPI device objects having the "PNP0C02" and "PNP0C01" IDs.
>>
>> Apparently, snb_uncore_imc_init_box() steps on a range already reserved by that
>> driver on your box.  And this doesn't seem to be a coincidence, because the ACPI
>> device object in question probably *does* correspond to the memory controller
>> that the uncore driver attempts to use.
>>
>> I'm not sure how to address that right now to be honest.  Arguably, the PNP
>> "system" driver should be replaced with something saner, but still the
>> resources it claims need to be kept out of reach of the PCI's resource
>> allocation code.
>
> The quirk_system_pci_resources is meant to disable PNP devices' resource if
> they collide with any known PCI device's BAR. I'm not sure why it doesn't work
> here, perhaps the uncore PCI device doesn't have a BAR that falls in the PNP
> device's resource window?
>
Another hypothesis I am exploring with Bjorn is that the BIOS does not advertise
this correctly or that this BAR has non-standard size or behavior. So
far, we have
observed the collision only on Lenovo IvyBridge laptops. I have tried
on my desktop
SNB, IVB, HSW machines and never saw the assertion.

> Thanks,
> Aaron
>
>>
>>> ...
>>> [    0.488998] software IO TLB [mem 0xcac30000-0xcec30000] (64MB) mapped at [ffff8800cac30000-ffff8800cec2ffff]
>>> [    0.489975] resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
>>> [    0.490079] ------------[ cut here ]------------
>>> [    0.490204] WARNING: CPU: 2 PID: 1 at arch/x86/mm/ioremap.c:171 __ioremap_caller+0x372/0x380()
>>> [    0.490306] Info: mapping multiple BARs. Your kernel is fine.
>>> [    0.490371] Modules linked in:
>>> [    0.490558] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc4+ #1
>>> [    0.490642] Hardware name: LENOVO 2320CTO/2320CTO, BIOS G2ET86WW (2.06 ) 11/13/2012
>>> [    0.490742]  00000000000000ab ffff880213d01ad8 ffffffff816112e3 0000000000000006
>>> [    0.491032]  ffff880213d01b28 ffff880213d01b18 ffffffff8104e9bc ffff880213d01b08
>>> [    0.491343]  ffffc90000c58000 00000000fed10000 00000000fed10000 0000000000006000
>>> [    0.491631] Call Trace:
>>> [    0.493337]  [<ffffffff816112e3>] dump_stack+0x4f/0x7c
>>> [    0.493420]  [<ffffffff8104e9bc>] warn_slowpath_common+0x8c/0xc0
>>> [    0.493503]  [<ffffffff8104eaa6>] warn_slowpath_fmt+0x46/0x50
>>> [    0.493588]  [<ffffffff8103f1e2>] __ioremap_caller+0x372/0x380
>>> [    0.493674]  [<ffffffff810211a2>] ? snb_uncore_imc_init_box+0x62/0x90
>>> [    0.493761]  [<ffffffff8103f247>] ioremap_nocache+0x17/0x20
>>> [    0.493846]  [<ffffffff810211a2>] snb_uncore_imc_init_box+0x62/0x90
>>> [    0.493933]  [<ffffffff81022925>] uncore_pci_probe+0xe5/0x1e0
>>> [    0.494020]  [<ffffffff812d487e>] local_pci_probe+0x4e/0xa0
>>> [    0.494104]  [<ffffffff81418a59>] ? get_device+0x19/0x20
>>> [    0.494213]  [<ffffffff812d5cd1>] pci_device_probe+0xe1/0x130
>>> [    0.494300]  [<ffffffff8141d3cb>] driver_probe_device+0x7b/0x240
>>> [    0.494385]  [<ffffffff8141d63b>] __driver_attach+0xab/0xb0
>>> [    0.494469]  [<ffffffff8141d590>] ? driver_probe_device+0x240/0x240
>>> [    0.494551]  [<ffffffff8141b71e>] bus_for_each_dev+0x5e/0x90
>>> [    0.494634]  [<ffffffff8141cede>] driver_attach+0x1e/0x20
>>> [    0.494718]  [<ffffffff8141ca57>] bus_add_driver+0x117/0x230
>>> [    0.494802]  [<ffffffff8141dd34>] driver_register+0x64/0xf0
>>> [    0.494884]  [<ffffffff812d4c14>] __pci_register_driver+0x64/0x70
>>> [    0.494972]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
>>> [    0.495056]  [<ffffffff81d03312>] intel_uncore_init+0x177/0x41c
>>> [    0.495155]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
>>> [    0.495242]  [<ffffffff8100029e>] do_one_initcall+0x4e/0x170
>>> [    0.495326]  [<ffffffff81071100>] ? parse_args+0x60/0x360
>>> [    0.495411]  [<ffffffff81cfbfb8>] kernel_init_freeable+0x106/0x19a
>>> [    0.495497]  [<ffffffff81cfb83b>] ? do_early_param+0x86/0x86
>>> [    0.495582]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
>>> [    0.495666]  [<ffffffff81607efe>] kernel_init+0xe/0xf0
>>> [    0.495749]  [<ffffffff81621f6c>] ret_from_fork+0x7c/0xb0
>>> [    0.495831]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
>>> [    0.495921] ---[ end trace 428f365c054d9a01 ]---
>>> [    0.496196] RAPL PMU detected, hw unit 2^-16 Joules, API unit is 2^-32 Joules, 3 fixed counters 163840 ms ovfl timer
>>> [    0.498598] futex hash table entries: 1024 (order: 5, 131072 bytes)
>>> [    0.498833] audit: initializing netlink subsys (disabled)
>>> [    0.499024] audit: type=2000 audit(1393259866.477:1): initialized
>>> ...
>>>
>>>
>>
>

RE: Info: mapping multiple BARs. Your kernel is fine.

[Zhang, Rui]

> -----Original Message-----
> From: Lu, Aaron
> Sent: Thursday, March 20, 2014 10:24 AM
> To: Rafael J. Wysocki; Borislav Petkov
> Cc: lkml; x86@kernel.org; Bjorn Helgaas; Linux PCI; ACPI Devel Maling
> List; Zhang, Rui; Yinghai Lu; H. Peter Anvin; Stephane Eranian
> Subject: Re: Info: mapping multiple BARs. Your kernel is fine.
> Importance: High
> 
> On 03/15/2014 10:15 PM, Rafael J. Wysocki wrote:
> > [CC list rearranged]
> >
> > On Monday, February 24, 2014 05:24:00 PM Borislav Petkov wrote:
> >> This started happening this morning after booting -rc4+tip, let's
> add
> >> *everybody* to CC :-)
> >>
> >> We have intel_uncore_init, snb_uncore_imc_init_box, uncore_pci_probe
> >> and other goodies on the stack.
> >
> > I've just gone throught this.
> >
> > So the problem is that we have the PNP "system" driver whose only
> > purpose seems to be to reserve system resources so that the PCI layer
> > doesn't assign them to new devices on hotplug (disclaimer: I didn't
> > invent it, I only read the code and comments in there).
> 
> And to PCI devices which have uninitialized BARs.
> 
> >
> > It does that for ACPI device objects having the "PNP0C02" and
> "PNP0C01" IDs.
> >
> > Apparently, snb_uncore_imc_init_box() steps on a range already
> > reserved by that driver on your box.  And this doesn't seem to be a
> > coincidence, because the ACPI device object in question probably
> > *does* correspond to the memory controller that the uncore driver
> attempts to use.
> >
> > I'm not sure how to address that right now to be honest.  Arguably,
> > the PNP "system" driver should be replaced with something saner, but
> > still the resources it claims need to be kept out of reach of the
> > PCI's resource allocation code.
> 
> The quirk_system_pci_resources is meant to disable PNP devices'
> resource if they collide with any known PCI device's BAR. I'm not sure
> why it doesn't work here, perhaps the uncore PCI device doesn't have a
> BAR that falls in the PNP device's resource window?
>
I've talked with Yan Zheng, and I was told that this resource "0xfed10000 - 0xfed15fff"
is got from PCI device register directly, which is not in its BAR range.
Thus IMO, it is impossible for PNP layer to be aware of this resource.

BTW, about drivers/pnp/system.c, if its ONLY purpose is to prevent those
resources from being allocated to uninitialized PCI devices, then IMO,
the best way to do this is make PCI bus handle those PNP0C01/PNP0C02
resources directly, probably via a platform callback, say,
1. make drivers/pnp/system.c a no-op for PNPACPI, by checking pnp_dev->protocol.
2. introduce acpi_check_reserved_resource() to parsing PNP0C01/PNP0C02 resources.
3. in PCI bus, invoke acpi_check_reserved_resource() when assigning
   resources to PCI devices.

Thanks,
rui
 
> Thanks,
> Aaron
> 
> >
> >> ...
> >> [    0.488998] software IO TLB [mem 0xcac30000-0xcec30000] (64MB)
> mapped at [ffff8800cac30000-ffff8800cec2ffff]
> >> [    0.489975] resource map sanity check conflict: 0xfed10000
> 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
> >> [    0.490079] ------------[ cut here ]------------
> >> [    0.490204] WARNING: CPU: 2 PID: 1 at arch/x86/mm/ioremap.c:171
> __ioremap_caller+0x372/0x380()
> >> [    0.490306] Info: mapping multiple BARs. Your kernel is fine.
> >> [    0.490371] Modules linked in:
> >> [    0.490558] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc4+
> #1
> >> [    0.490642] Hardware name: LENOVO 2320CTO/2320CTO, BIOS G2ET86WW
> (2.06 ) 11/13/2012
> >> [    0.490742]  00000000000000ab ffff880213d01ad8 ffffffff816112e3
> 0000000000000006
> >> [    0.491032]  ffff880213d01b28 ffff880213d01b18 ffffffff8104e9bc
> ffff880213d01b08
> >> [    0.491343]  ffffc90000c58000 00000000fed10000 00000000fed10000
> 0000000000006000
> >> [    0.491631] Call Trace:
> >> [    0.493337]  [<ffffffff816112e3>] dump_stack+0x4f/0x7c
> >> [    0.493420]  [<ffffffff8104e9bc>] warn_slowpath_common+0x8c/0xc0
> >> [    0.493503]  [<ffffffff8104eaa6>] warn_slowpath_fmt+0x46/0x50
> >> [    0.493588]  [<ffffffff8103f1e2>] __ioremap_caller+0x372/0x380
> >> [    0.493674]  [<ffffffff810211a2>] ?
> snb_uncore_imc_init_box+0x62/0x90
> >> [    0.493761]  [<ffffffff8103f247>] ioremap_nocache+0x17/0x20
> >> [    0.493846]  [<ffffffff810211a2>]
> snb_uncore_imc_init_box+0x62/0x90
> >> [    0.493933]  [<ffffffff81022925>] uncore_pci_probe+0xe5/0x1e0
> >> [    0.494020]  [<ffffffff812d487e>] local_pci_probe+0x4e/0xa0
> >> [    0.494104]  [<ffffffff81418a59>] ? get_device+0x19/0x20
> >> [    0.494213]  [<ffffffff812d5cd1>] pci_device_probe+0xe1/0x130
> >> [    0.494300]  [<ffffffff8141d3cb>] driver_probe_device+0x7b/0x240
> >> [    0.494385]  [<ffffffff8141d63b>] __driver_attach+0xab/0xb0
> >> [    0.494469]  [<ffffffff8141d590>] ?
> driver_probe_device+0x240/0x240
> >> [    0.494551]  [<ffffffff8141b71e>] bus_for_each_dev+0x5e/0x90
> >> [    0.494634]  [<ffffffff8141cede>] driver_attach+0x1e/0x20
> >> [    0.494718]  [<ffffffff8141ca57>] bus_add_driver+0x117/0x230
> >> [    0.494802]  [<ffffffff8141dd34>] driver_register+0x64/0xf0
> >> [    0.494884]  [<ffffffff812d4c14>] __pci_register_driver+0x64/0x70
> >> [    0.494972]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
> >> [    0.495056]  [<ffffffff81d03312>] intel_uncore_init+0x177/0x41c
> >> [    0.495155]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
> >> [    0.495242]  [<ffffffff8100029e>] do_one_initcall+0x4e/0x170
> >> [    0.495326]  [<ffffffff81071100>] ? parse_args+0x60/0x360
> >> [    0.495411]  [<ffffffff81cfbfb8>]
> kernel_init_freeable+0x106/0x19a
> >> [    0.495497]  [<ffffffff81cfb83b>] ? do_early_param+0x86/0x86
> >> [    0.495582]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
> >> [    0.495666]  [<ffffffff81607efe>] kernel_init+0xe/0xf0
> >> [    0.495749]  [<ffffffff81621f6c>] ret_from_fork+0x7c/0xb0
> >> [    0.495831]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
> >> [    0.495921] ---[ end trace 428f365c054d9a01 ]---
> >> [    0.496196] RAPL PMU detected, hw unit 2^-16 Joules, API unit is
> 2^-32 Joules, 3 fixed counters 163840 ms ovfl timer
> >> [    0.498598] futex hash table entries: 1024 (order: 5, 131072
> bytes)
> >> [    0.498833] audit: initializing netlink subsys (disabled)
> >> [    0.499024] audit: type=2000 audit(1393259866.477:1): initialized
> >> ...
> >>
> >>
> >

Re: Info: mapping multiple BARs. Your kernel is fine.

[Stephane Eranian]

On Thu, Mar 20, 2014 at 4:03 AM, Zhang, Rui <rui.zhang@intel.com> wrote:
>
>
>> -----Original Message-----
>> From: Lu, Aaron
>> Sent: Thursday, March 20, 2014 10:24 AM
>> To: Rafael J. Wysocki; Borislav Petkov
>> Cc: lkml; x86@kernel.org; Bjorn Helgaas; Linux PCI; ACPI Devel Maling
>> List; Zhang, Rui; Yinghai Lu; H. Peter Anvin; Stephane Eranian
>> Subject: Re: Info: mapping multiple BARs. Your kernel is fine.
>> Importance: High
>>
>> On 03/15/2014 10:15 PM, Rafael J. Wysocki wrote:
>> > [CC list rearranged]
>> >
>> > On Monday, February 24, 2014 05:24:00 PM Borislav Petkov wrote:
>> >> This started happening this morning after booting -rc4+tip, let's
>> add
>> >> *everybody* to CC :-)
>> >>
>> >> We have intel_uncore_init, snb_uncore_imc_init_box, uncore_pci_probe
>> >> and other goodies on the stack.
>> >
>> > I've just gone throught this.
>> >
>> > So the problem is that we have the PNP "system" driver whose only
>> > purpose seems to be to reserve system resources so that the PCI layer
>> > doesn't assign them to new devices on hotplug (disclaimer: I didn't
>> > invent it, I only read the code and comments in there).
>>
>> And to PCI devices which have uninitialized BARs.
>>
>> >
>> > It does that for ACPI device objects having the "PNP0C02" and
>> "PNP0C01" IDs.
>> >
>> > Apparently, snb_uncore_imc_init_box() steps on a range already
>> > reserved by that driver on your box.  And this doesn't seem to be a
>> > coincidence, because the ACPI device object in question probably
>> > *does* correspond to the memory controller that the uncore driver
>> attempts to use.
>> >
>> > I'm not sure how to address that right now to be honest.  Arguably,
>> > the PNP "system" driver should be replaced with something saner, but
>> > still the resources it claims need to be kept out of reach of the
>> > PCI's resource allocation code.
>>
>> The quirk_system_pci_resources is meant to disable PNP devices'
>> resource if they collide with any known PCI device's BAR. I'm not sure
>> why it doesn't work here, perhaps the uncore PCI device doesn't have a
>> BAR that falls in the PNP device's resource window?
>>
> I've talked with Yan Zheng, and I was told that this resource "0xfed10000 - 0xfed15fff"
> is got from PCI device register directly, which is not in its BAR range.
> Thus IMO, it is impossible for PNP layer to be aware of this resource.
>
That is not what the perf_event code does. Nothing is hardcoded except
the IMC PCI device ids. The BAR offset is hardcoded that's all. The 0xfed10000
is discovered.

> BTW, about drivers/pnp/system.c, if its ONLY purpose is to prevent those
> resources from being allocated to uninitialized PCI devices, then IMO,
> the best way to do this is make PCI bus handle those PNP0C01/PNP0C02
> resources directly, probably via a platform callback, say,
> 1. make drivers/pnp/system.c a no-op for PNPACPI, by checking pnp_dev->protocol.
> 2. introduce acpi_check_reserved_resource() to parsing PNP0C01/PNP0C02 resources.
> 3. in PCI bus, invoke acpi_check_reserved_resource() when assigning
>    resources to PCI devices.
>
> Thanks,
> rui
>
>> Thanks,
>> Aaron
>>
>> >
>> >> ...
>> >> [    0.488998] software IO TLB [mem 0xcac30000-0xcec30000] (64MB)
>> mapped at [ffff8800cac30000-ffff8800cec2ffff]
>> >> [    0.489975] resource map sanity check conflict: 0xfed10000
>> 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
>> >> [    0.490079] ------------[ cut here ]------------
>> >> [    0.490204] WARNING: CPU: 2 PID: 1 at arch/x86/mm/ioremap.c:171
>> __ioremap_caller+0x372/0x380()
>> >> [    0.490306] Info: mapping multiple BARs. Your kernel is fine.
>> >> [    0.490371] Modules linked in:
>> >> [    0.490558] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc4+
>> #1
>> >> [    0.490642] Hardware name: LENOVO 2320CTO/2320CTO, BIOS G2ET86WW
>> (2.06 ) 11/13/2012
>> >> [    0.490742]  00000000000000ab ffff880213d01ad8 ffffffff816112e3
>> 0000000000000006
>> >> [    0.491032]  ffff880213d01b28 ffff880213d01b18 ffffffff8104e9bc
>> ffff880213d01b08
>> >> [    0.491343]  ffffc90000c58000 00000000fed10000 00000000fed10000
>> 0000000000006000
>> >> [    0.491631] Call Trace:
>> >> [    0.493337]  [<ffffffff816112e3>] dump_stack+0x4f/0x7c
>> >> [    0.493420]  [<ffffffff8104e9bc>] warn_slowpath_common+0x8c/0xc0
>> >> [    0.493503]  [<ffffffff8104eaa6>] warn_slowpath_fmt+0x46/0x50
>> >> [    0.493588]  [<ffffffff8103f1e2>] __ioremap_caller+0x372/0x380
>> >> [    0.493674]  [<ffffffff810211a2>] ?
>> snb_uncore_imc_init_box+0x62/0x90
>> >> [    0.493761]  [<ffffffff8103f247>] ioremap_nocache+0x17/0x20
>> >> [    0.493846]  [<ffffffff810211a2>]
>> snb_uncore_imc_init_box+0x62/0x90
>> >> [    0.493933]  [<ffffffff81022925>] uncore_pci_probe+0xe5/0x1e0
>> >> [    0.494020]  [<ffffffff812d487e>] local_pci_probe+0x4e/0xa0
>> >> [    0.494104]  [<ffffffff81418a59>] ? get_device+0x19/0x20
>> >> [    0.494213]  [<ffffffff812d5cd1>] pci_device_probe+0xe1/0x130
>> >> [    0.494300]  [<ffffffff8141d3cb>] driver_probe_device+0x7b/0x240
>> >> [    0.494385]  [<ffffffff8141d63b>] __driver_attach+0xab/0xb0
>> >> [    0.494469]  [<ffffffff8141d590>] ?
>> driver_probe_device+0x240/0x240
>> >> [    0.494551]  [<ffffffff8141b71e>] bus_for_each_dev+0x5e/0x90
>> >> [    0.494634]  [<ffffffff8141cede>] driver_attach+0x1e/0x20
>> >> [    0.494718]  [<ffffffff8141ca57>] bus_add_driver+0x117/0x230
>> >> [    0.494802]  [<ffffffff8141dd34>] driver_register+0x64/0xf0
>> >> [    0.494884]  [<ffffffff812d4c14>] __pci_register_driver+0x64/0x70
>> >> [    0.494972]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
>> >> [    0.495056]  [<ffffffff81d03312>] intel_uncore_init+0x177/0x41c
>> >> [    0.495155]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
>> >> [    0.495242]  [<ffffffff8100029e>] do_one_initcall+0x4e/0x170
>> >> [    0.495326]  [<ffffffff81071100>] ? parse_args+0x60/0x360
>> >> [    0.495411]  [<ffffffff81cfbfb8>]
>> kernel_init_freeable+0x106/0x19a
>> >> [    0.495497]  [<ffffffff81cfb83b>] ? do_early_param+0x86/0x86
>> >> [    0.495582]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
>> >> [    0.495666]  [<ffffffff81607efe>] kernel_init+0xe/0xf0
>> >> [    0.495749]  [<ffffffff81621f6c>] ret_from_fork+0x7c/0xb0
>> >> [    0.495831]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
>> >> [    0.495921] ---[ end trace 428f365c054d9a01 ]---
>> >> [    0.496196] RAPL PMU detected, hw unit 2^-16 Joules, API unit is
>> 2^-32 Joules, 3 fixed counters 163840 ms ovfl timer
>> >> [    0.498598] futex hash table entries: 1024 (order: 5, 131072
>> bytes)
>> >> [    0.498833] audit: initializing netlink subsys (disabled)
>> >> [    0.499024] audit: type=2000 audit(1393259866.477:1): initialized
>> >> ...
>> >>
>> >>
>> >
>

RE: Info: mapping multiple BARs. Your kernel is fine.

[Zhang, Rui]

> -----Original Message-----
> From: Stephane Eranian [mailto:eranian@google.com]
> Sent: Thursday, March 20, 2014 11:35 AM
> To: Zhang, Rui
> Cc: Lu, Aaron; Rafael J. Wysocki; Borislav Petkov; lkml; x86@kernel.org;
> Bjorn Helgaas; Linux PCI; ACPI Devel Maling List; Yinghai Lu; H. Peter
> Anvin; Yan, Zheng Z
> Subject: Re: Info: mapping multiple BARs. Your kernel is fine.
> Importance: High
> 
> On Thu, Mar 20, 2014 at 4:03 AM, Zhang, Rui <rui.zhang@intel.com> wrote:
> >
> >
> >> -----Original Message-----
> >> From: Lu, Aaron
> >> Sent: Thursday, March 20, 2014 10:24 AM
> >> To: Rafael J. Wysocki; Borislav Petkov
> >> Cc: lkml; x86@kernel.org; Bjorn Helgaas; Linux PCI; ACPI Devel
> Maling
> >> List; Zhang, Rui; Yinghai Lu; H. Peter Anvin; Stephane Eranian
> >> Subject: Re: Info: mapping multiple BARs. Your kernel is fine.
> >> Importance: High
> >>
> >> On 03/15/2014 10:15 PM, Rafael J. Wysocki wrote:
> >> > [CC list rearranged]
> >> >
> >> > On Monday, February 24, 2014 05:24:00 PM Borislav Petkov wrote:
> >> >> This started happening this morning after booting -rc4+tip, let's
> >> add
> >> >> *everybody* to CC :-)
> >> >>
> >> >> We have intel_uncore_init, snb_uncore_imc_init_box,
> >> >> uncore_pci_probe and other goodies on the stack.
> >> >
> >> > I've just gone throught this.
> >> >
> >> > So the problem is that we have the PNP "system" driver whose only
> >> > purpose seems to be to reserve system resources so that the PCI
> >> > layer doesn't assign them to new devices on hotplug (disclaimer: I
> >> > didn't invent it, I only read the code and comments in there).
> >>
> >> And to PCI devices which have uninitialized BARs.
> >>
> >> >
> >> > It does that for ACPI device objects having the "PNP0C02" and
> >> "PNP0C01" IDs.
> >> >
> >> > Apparently, snb_uncore_imc_init_box() steps on a range already
> >> > reserved by that driver on your box.  And this doesn't seem to be
> a
> >> > coincidence, because the ACPI device object in question probably
> >> > *does* correspond to the memory controller that the uncore driver
> >> attempts to use.
> >> >
> >> > I'm not sure how to address that right now to be honest.  Arguably,
> >> > the PNP "system" driver should be replaced with something saner,
> >> > but still the resources it claims need to be kept out of reach of
> >> > the PCI's resource allocation code.
> >>
> >> The quirk_system_pci_resources is meant to disable PNP devices'
> >> resource if they collide with any known PCI device's BAR. I'm not
> >> sure why it doesn't work here, perhaps the uncore PCI device doesn't
> >> have a BAR that falls in the PNP device's resource window?
> >>
> > I've talked with Yan Zheng, and I was told that this resource
> "0xfed10000 - 0xfed15fff"
> > is got from PCI device register directly, which is not in its BAR
> range.
> > Thus IMO, it is impossible for PNP layer to be aware of this resource.
> >
> That is not what the perf_event code does. Nothing is hardcoded except
> the IMC PCI device ids. The BAR offset is hardcoded that's all. The
> 0xfed10000 is discovered.
> 
The resource length is also hardcoded to 0x6000, right?
This is probably a problem, because
only if the resource length read from PCI config space is larger than 0x4000,
drivers/pnp/quirks.c will detect the conflict and disable the PNP0C02
resource 0xfed10000 - 0xfed13fff, and the PCI device can request this
resource successfully.
In order to check this, can you please attach the dmesg output after boot?

Thanks,
rui

> > BTW, about drivers/pnp/system.c, if its ONLY purpose is to prevent
> > those resources from being allocated to uninitialized PCI devices,
> > then IMO, the best way to do this is make PCI bus handle those
> > PNP0C01/PNP0C02 resources directly, probably via a platform callback,
> > say, 1. make drivers/pnp/system.c a no-op for PNPACPI, by checking
> pnp_dev->protocol.
> > 2. introduce acpi_check_reserved_resource() to parsing
> PNP0C01/PNP0C02 resources.
> > 3. in PCI bus, invoke acpi_check_reserved_resource() when assigning
> >    resources to PCI devices.
> >
> > Thanks,
> > rui
> >
> >> Thanks,
> >> Aaron
> >>
> >> >
> >> >> ...
> >> >> [    0.488998] software IO TLB [mem 0xcac30000-0xcec30000] (64MB)
> >> mapped at [ffff8800cac30000-ffff8800cec2ffff]
> >> >> [    0.489975] resource map sanity check conflict: 0xfed10000
> >> 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
> >> >> [    0.490079] ------------[ cut here ]------------
> >> >> [    0.490204] WARNING: CPU: 2 PID: 1 at
> arch/x86/mm/ioremap.c:171
> >> __ioremap_caller+0x372/0x380()
> >> >> [    0.490306] Info: mapping multiple BARs. Your kernel is fine.
> >> >> [    0.490371] Modules linked in:
> >> >> [    0.490558] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.14.0-
> rc4+
> >> #1
> >> >> [    0.490642] Hardware name: LENOVO 2320CTO/2320CTO, BIOS
> G2ET86WW
> >> (2.06 ) 11/13/2012
> >> >> [    0.490742]  00000000000000ab ffff880213d01ad8
> ffffffff816112e3
> >> 0000000000000006
> >> >> [    0.491032]  ffff880213d01b28 ffff880213d01b18
> ffffffff8104e9bc
> >> ffff880213d01b08
> >> >> [    0.491343]  ffffc90000c58000 00000000fed10000
> 00000000fed10000
> >> 0000000000006000
> >> >> [    0.491631] Call Trace:
> >> >> [    0.493337]  [<ffffffff816112e3>] dump_stack+0x4f/0x7c
> >> >> [    0.493420]  [<ffffffff8104e9bc>]
> warn_slowpath_common+0x8c/0xc0
> >> >> [    0.493503]  [<ffffffff8104eaa6>] warn_slowpath_fmt+0x46/0x50
> >> >> [    0.493588]  [<ffffffff8103f1e2>] __ioremap_caller+0x372/0x380
> >> >> [    0.493674]  [<ffffffff810211a2>] ?
> >> snb_uncore_imc_init_box+0x62/0x90
> >> >> [    0.493761]  [<ffffffff8103f247>] ioremap_nocache+0x17/0x20
> >> >> [    0.493846]  [<ffffffff810211a2>]
> >> snb_uncore_imc_init_box+0x62/0x90
> >> >> [    0.493933]  [<ffffffff81022925>] uncore_pci_probe+0xe5/0x1e0
> >> >> [    0.494020]  [<ffffffff812d487e>] local_pci_probe+0x4e/0xa0
> >> >> [    0.494104]  [<ffffffff81418a59>] ? get_device+0x19/0x20
> >> >> [    0.494213]  [<ffffffff812d5cd1>] pci_device_probe+0xe1/0x130
> >> >> [    0.494300]  [<ffffffff8141d3cb>]
> driver_probe_device+0x7b/0x240
> >> >> [    0.494385]  [<ffffffff8141d63b>] __driver_attach+0xab/0xb0
> >> >> [    0.494469]  [<ffffffff8141d590>] ?
> >> driver_probe_device+0x240/0x240
> >> >> [    0.494551]  [<ffffffff8141b71e>] bus_for_each_dev+0x5e/0x90
> >> >> [    0.494634]  [<ffffffff8141cede>] driver_attach+0x1e/0x20
> >> >> [    0.494718]  [<ffffffff8141ca57>] bus_add_driver+0x117/0x230
> >> >> [    0.494802]  [<ffffffff8141dd34>] driver_register+0x64/0xf0
> >> >> [    0.494884]  [<ffffffff812d4c14>]
> __pci_register_driver+0x64/0x70
> >> >> [    0.494972]  [<ffffffff81d0319b>] ?
> uncore_types_init+0x19c/0x19c
> >> >> [    0.495056]  [<ffffffff81d03312>]
> intel_uncore_init+0x177/0x41c
> >> >> [    0.495155]  [<ffffffff81d0319b>] ?
> uncore_types_init+0x19c/0x19c
> >> >> [    0.495242]  [<ffffffff8100029e>] do_one_initcall+0x4e/0x170
> >> >> [    0.495326]  [<ffffffff81071100>] ? parse_args+0x60/0x360
> >> >> [    0.495411]  [<ffffffff81cfbfb8>]
> >> kernel_init_freeable+0x106/0x19a
> >> >> [    0.495497]  [<ffffffff81cfb83b>] ? do_early_param+0x86/0x86
> >> >> [    0.495582]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
> >> >> [    0.495666]  [<ffffffff81607efe>] kernel_init+0xe/0xf0
> >> >> [    0.495749]  [<ffffffff81621f6c>] ret_from_fork+0x7c/0xb0
> >> >> [    0.495831]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
> >> >> [    0.495921] ---[ end trace 428f365c054d9a01 ]---
> >> >> [    0.496196] RAPL PMU detected, hw unit 2^-16 Joules, API unit
> is
> >> 2^-32 Joules, 3 fixed counters 163840 ms ovfl timer
> >> >> [    0.498598] futex hash table entries: 1024 (order: 5, 131072
> >> bytes)
> >> >> [    0.498833] audit: initializing netlink subsys (disabled)
> >> >> [    0.499024] audit: type=2000 audit(1393259866.477:1):
> initialized
> >> >> ...
> >> >>
> >> >>
> >> >
> >

Re: Info: mapping multiple BARs. Your kernel is fine.

[Yan, Zheng]

On 03/20/2014 03:53 PM, Zhang, Rui wrote:
> The resource length is also hardcoded to 0x6000, right?
> This is probably a problem, because
> only if the resource length read from PCI config space is larger than 0x4000,
> drivers/pnp/quirks.c will detect the conflict and disable the PNP0C02
> resource 0xfed10000 - 0xfed13fff, and the PCI device can request this
> resource successfully.
> In order to check this, can you please attach the dmesg output after boot?

maybe the issue can be fixed by below untested patch

---
diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index fd5e883..2b3d834 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -1701,7 +1701,7 @@ static struct uncore_event_desc snb_uncore_imc_events[] = {
 #define SNB_UNCORE_PCI_IMC_BAR_OFFSET		0x48
 
 /* page size multiple covering all config regs */
-#define SNB_UNCORE_PCI_IMC_MAP_SIZE		0x6000
+#define SNB_UNCORE_PCI_IMC_MAP_SIZE		0x8
 
 #define SNB_UNCORE_PCI_IMC_DATA_READS		0x1
 #define SNB_UNCORE_PCI_IMC_DATA_READS_BASE	0x5050
@@ -1736,7 +1736,8 @@ static void snb_uncore_imc_init_box(struct intel_uncore_box *box)
 
 	addr &= ~(PAGE_SIZE - 1);
 
-	box->io_addr = ioremap(addr, SNB_UNCORE_PCI_IMC_MAP_SIZE);
+	box->io_addr = ioremap(addr + SNB_UNCORE_PCI_IMC_CTR_BASE,
+			       SNB_UNCORE_PCI_IMC_MAP_SIZE);
 	box->hrtimer_duration = UNCORE_SNB_IMC_HRTIMER_INTERVAL;
 }
 
@@ -1832,7 +1833,7 @@ static int snb_uncore_imc_event_init(struct perf_event *event)
 	}
 
 	/* must be done before validate_group */
-	event->hw.event_base = base;
+	event->hw.event_base = base - SNB_UNCORE_PCI_IMC_CTR_BASE;
 	event->hw.config = cfg;
 	event->hw.idx = idx;
 

Re: Info: mapping multiple BARs. Your kernel is fine.

[Zhang Rui]

On Thu, 2014-03-20 at 16:16 +0800, Yan, Zheng wrote:
> On 03/20/2014 03:53 PM, Zhang, Rui wrote:
> > The resource length is also hardcoded to 0x6000, right?
> > This is probably a problem, because
> > only if the resource length read from PCI config space is larger than 0x4000,
> > drivers/pnp/quirks.c will detect the conflict and disable the PNP0C02
> > resource 0xfed10000 - 0xfed13fff, and the PCI device can request this
> > resource successfully.
> > In order to check this, can you please attach the dmesg output after boot?
> 
> maybe the issue can be fixed by below untested patch
> 
> ---
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> index fd5e883..2b3d834 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> @@ -1701,7 +1701,7 @@ static struct uncore_event_desc snb_uncore_imc_events[] = {
>  #define SNB_UNCORE_PCI_IMC_BAR_OFFSET		0x48
>  
>  /* page size multiple covering all config regs */
> -#define SNB_UNCORE_PCI_IMC_MAP_SIZE		0x6000
> +#define SNB_UNCORE_PCI_IMC_MAP_SIZE		0x8
>  
>  #define SNB_UNCORE_PCI_IMC_DATA_READS		0x1
>  #define SNB_UNCORE_PCI_IMC_DATA_READS_BASE	0x5050
> @@ -1736,7 +1736,8 @@ static void snb_uncore_imc_init_box(struct intel_uncore_box *box)
>  
>  	addr &= ~(PAGE_SIZE - 1);
>  
> -	box->io_addr = ioremap(addr, SNB_UNCORE_PCI_IMC_MAP_SIZE);
> +	box->io_addr = ioremap(addr + SNB_UNCORE_PCI_IMC_CTR_BASE,
> +			       SNB_UNCORE_PCI_IMC_MAP_SIZE);

you're remapping 0xfed15050 - 0xfed1b04f instead of 0xfed10000 -
0xfed15fff ?
I do not quite understand this, but apparently this is not a FIX.
If it works for this problem, it is because 0xfed15050 - 0xfed1b04f
happens to be not conflict with any resource reserved by PNP system
driver, on this machine.

thanks,
rui

>  	box->hrtimer_duration = UNCORE_SNB_IMC_HRTIMER_INTERVAL;
>  }
>  
> @@ -1832,7 +1833,7 @@ static int snb_uncore_imc_event_init(struct perf_event *event)
>  	}
>  
>  	/* must be done before validate_group */
> -	event->hw.event_base = base;
> +	event->hw.event_base = base - SNB_UNCORE_PCI_IMC_CTR_BASE;
>  	event->hw.config = cfg;
>  	event->hw.idx = idx;
>  

Re: Info: mapping multiple BARs. Your kernel is fine.

[Stephane Eranian]

On Thu, Mar 20, 2014 at 9:16 AM, Yan, Zheng <zheng.z.yan@intel.com> wrote:
> On 03/20/2014 03:53 PM, Zhang, Rui wrote:
>> The resource length is also hardcoded to 0x6000, right?
>> This is probably a problem, because
>> only if the resource length read from PCI config space is larger than 0x4000,
>> drivers/pnp/quirks.c will detect the conflict and disable the PNP0C02
>> resource 0xfed10000 - 0xfed13fff, and the PCI device can request this
>> resource successfully.
>> In order to check this, can you please attach the dmesg output after boot?
>
> maybe the issue can be fixed by below untested patch
>
> ---
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> index fd5e883..2b3d834 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> @@ -1701,7 +1701,7 @@ static struct uncore_event_desc snb_uncore_imc_events[] = {
>  #define SNB_UNCORE_PCI_IMC_BAR_OFFSET          0x48
>
>  /* page size multiple covering all config regs */
> -#define SNB_UNCORE_PCI_IMC_MAP_SIZE            0x6000
> +#define SNB_UNCORE_PCI_IMC_MAP_SIZE            0x8
>
I assume ioremap() works on page boundaries.
Eventually want to expose the other counters too, not just read and
writes ( 8 bytes total).

The size of 0x6000 comes from the counter offsets: BAR + 0x5040 to BAR + 0x5054.
May be a better way of doing this would be to remap just the one page
holding them
instead of the 6 covering the entire BAR + counters. That would need
changes in the
read_counter() but that is okay.

So that would something along the line of:

    addr = (addr + 0x5040) & (PAGE_SIZE - 1);
    ioremap(addr, 0x1000);


>  #define SNB_UNCORE_PCI_IMC_DATA_READS          0x1
>  #define SNB_UNCORE_PCI_IMC_DATA_READS_BASE     0x5050
> @@ -1736,7 +1736,8 @@ static void snb_uncore_imc_init_box(struct intel_uncore_box *box)
>
>         addr &= ~(PAGE_SIZE - 1);
>
> -       box->io_addr = ioremap(addr, SNB_UNCORE_PCI_IMC_MAP_SIZE);
> +       box->io_addr = ioremap(addr + SNB_UNCORE_PCI_IMC_CTR_BASE,
> +                              SNB_UNCORE_PCI_IMC_MAP_SIZE);
>         box->hrtimer_duration = UNCORE_SNB_IMC_HRTIMER_INTERVAL;
>  }
>
> @@ -1832,7 +1833,7 @@ static int snb_uncore_imc_event_init(struct perf_event *event)
>         }
>
>         /* must be done before validate_group */
> -       event->hw.event_base = base;
> +       event->hw.event_base = base - SNB_UNCORE_PCI_IMC_CTR_BASE;
>         event->hw.config = cfg;
>         event->hw.idx = idx;
>

RE: Info: mapping multiple BARs. Your kernel is fine.

[Zhang Rui]

On Thu, 2014-03-20 at 07:53 +0000, Zhang, Rui wrote:
> 
> > -----Original Message-----
> > From: Stephane Eranian [mailto:eranian@google.com]
> > Sent: Thursday, March 20, 2014 11:35 AM
> > To: Zhang, Rui
> > Cc: Lu, Aaron; Rafael J. Wysocki; Borislav Petkov; lkml; x86@kernel.org;
> > Bjorn Helgaas; Linux PCI; ACPI Devel Maling List; Yinghai Lu; H. Peter
> > Anvin; Yan, Zheng Z
> > Subject: Re: Info: mapping multiple BARs. Your kernel is fine.
> > Importance: High
> > 
> > On Thu, Mar 20, 2014 at 4:03 AM, Zhang, Rui <rui.zhang@intel.com> wrote:
> > >
> > >
> > >> -----Original Message-----
> > >> From: Lu, Aaron
> > >> Sent: Thursday, March 20, 2014 10:24 AM
> > >> To: Rafael J. Wysocki; Borislav Petkov
> > >> Cc: lkml; x86@kernel.org; Bjorn Helgaas; Linux PCI; ACPI Devel
> > Maling
> > >> List; Zhang, Rui; Yinghai Lu; H. Peter Anvin; Stephane Eranian
> > >> Subject: Re: Info: mapping multiple BARs. Your kernel is fine.
> > >> Importance: High
> > >>
> > >> On 03/15/2014 10:15 PM, Rafael J. Wysocki wrote:
> > >> > [CC list rearranged]
> > >> >
> > >> > On Monday, February 24, 2014 05:24:00 PM Borislav Petkov wrote:
> > >> >> This started happening this morning after booting -rc4+tip, let's
> > >> add
> > >> >> *everybody* to CC :-)
> > >> >>
> > >> >> We have intel_uncore_init, snb_uncore_imc_init_box,
> > >> >> uncore_pci_probe and other goodies on the stack.
> > >> >
> > >> > I've just gone throught this.
> > >> >
> > >> > So the problem is that we have the PNP "system" driver whose only
> > >> > purpose seems to be to reserve system resources so that the PCI
> > >> > layer doesn't assign them to new devices on hotplug (disclaimer: I
> > >> > didn't invent it, I only read the code and comments in there).
> > >>
> > >> And to PCI devices which have uninitialized BARs.
> > >>
> > >> >
> > >> > It does that for ACPI device objects having the "PNP0C02" and
> > >> "PNP0C01" IDs.
> > >> >
> > >> > Apparently, snb_uncore_imc_init_box() steps on a range already
> > >> > reserved by that driver on your box.  And this doesn't seem to be
> > a
> > >> > coincidence, because the ACPI device object in question probably
> > >> > *does* correspond to the memory controller that the uncore driver
> > >> attempts to use.
> > >> >
> > >> > I'm not sure how to address that right now to be honest.  Arguably,
> > >> > the PNP "system" driver should be replaced with something saner,
> > >> > but still the resources it claims need to be kept out of reach of
> > >> > the PCI's resource allocation code.
> > >>
> > >> The quirk_system_pci_resources is meant to disable PNP devices'
> > >> resource if they collide with any known PCI device's BAR. I'm not
> > >> sure why it doesn't work here, perhaps the uncore PCI device doesn't
> > >> have a BAR that falls in the PNP device's resource window?
> > >>
> > > I've talked with Yan Zheng, and I was told that this resource
> > "0xfed10000 - 0xfed15fff"
> > > is got from PCI device register directly, which is not in its BAR
> > range.
> > > Thus IMO, it is impossible for PNP layer to be aware of this resource.
> > >
> > That is not what the perf_event code does. Nothing is hardcoded except
> > the IMC PCI device ids. The BAR offset is hardcoded that's all. The
> > 0xfed10000 is discovered.
> > 
> The resource length is also hardcoded to 0x6000, right?
> This is probably a problem, because
> only if the resource length read from PCI config space is larger than 0x4000,
> drivers/pnp/quirks.c will detect the conflict and disable the PNP0C02
> resource 0xfed10000 - 0xfed13fff, and the PCI device can request this
> resource successfully.
> In order to check this, can you please attach the dmesg output after boot?
> 
sorry, one correction here, I should say,
if the resource length read from PCI config space is smaller than
0x4000, the problem still exists because drivers/pnp/quirks.c do not
think this is a conflict.
But if the resource length read from PCI config space is larger than
0x4000, drivers/pnp/quirks.c can detect this conflict and prevent
resource 0xfed10000 - 0xfed13fff from being reserved.

thanks,
rui

> Thanks,
> rui
> 
> > > BTW, about drivers/pnp/system.c, if its ONLY purpose is to prevent
> > > those resources from being allocated to uninitialized PCI devices,
> > > then IMO, the best way to do this is make PCI bus handle those
> > > PNP0C01/PNP0C02 resources directly, probably via a platform callback,
> > > say, 1. make drivers/pnp/system.c a no-op for PNPACPI, by checking
> > pnp_dev->protocol.
> > > 2. introduce acpi_check_reserved_resource() to parsing
> > PNP0C01/PNP0C02 resources.
> > > 3. in PCI bus, invoke acpi_check_reserved_resource() when assigning
> > >    resources to PCI devices.
> > >
> > > Thanks,
> > > rui
> > >
> > >> Thanks,
> > >> Aaron
> > >>
> > >> >
> > >> >> ...
> > >> >> [    0.488998] software IO TLB [mem 0xcac30000-0xcec30000] (64MB)
> > >> mapped at [ffff8800cac30000-ffff8800cec2ffff]
> > >> >> [    0.489975] resource map sanity check conflict: 0xfed10000
> > >> 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
> > >> >> [    0.490079] ------------[ cut here ]------------
> > >> >> [    0.490204] WARNING: CPU: 2 PID: 1 at
> > arch/x86/mm/ioremap.c:171
> > >> __ioremap_caller+0x372/0x380()
> > >> >> [    0.490306] Info: mapping multiple BARs. Your kernel is fine.
> > >> >> [    0.490371] Modules linked in:
> > >> >> [    0.490558] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.14.0-
> > rc4+
> > >> #1
> > >> >> [    0.490642] Hardware name: LENOVO 2320CTO/2320CTO, BIOS
> > G2ET86WW
> > >> (2.06 ) 11/13/2012
> > >> >> [    0.490742]  00000000000000ab ffff880213d01ad8
> > ffffffff816112e3
> > >> 0000000000000006
> > >> >> [    0.491032]  ffff880213d01b28 ffff880213d01b18
> > ffffffff8104e9bc
> > >> ffff880213d01b08
> > >> >> [    0.491343]  ffffc90000c58000 00000000fed10000
> > 00000000fed10000
> > >> 0000000000006000
> > >> >> [    0.491631] Call Trace:
> > >> >> [    0.493337]  [<ffffffff816112e3>] dump_stack+0x4f/0x7c
> > >> >> [    0.493420]  [<ffffffff8104e9bc>]
> > warn_slowpath_common+0x8c/0xc0
> > >> >> [    0.493503]  [<ffffffff8104eaa6>] warn_slowpath_fmt+0x46/0x50
> > >> >> [    0.493588]  [<ffffffff8103f1e2>] __ioremap_caller+0x372/0x380
> > >> >> [    0.493674]  [<ffffffff810211a2>] ?
> > >> snb_uncore_imc_init_box+0x62/0x90
> > >> >> [    0.493761]  [<ffffffff8103f247>] ioremap_nocache+0x17/0x20
> > >> >> [    0.493846]  [<ffffffff810211a2>]
> > >> snb_uncore_imc_init_box+0x62/0x90
> > >> >> [    0.493933]  [<ffffffff81022925>] uncore_pci_probe+0xe5/0x1e0
> > >> >> [    0.494020]  [<ffffffff812d487e>] local_pci_probe+0x4e/0xa0
> > >> >> [    0.494104]  [<ffffffff81418a59>] ? get_device+0x19/0x20
> > >> >> [    0.494213]  [<ffffffff812d5cd1>] pci_device_probe+0xe1/0x130
> > >> >> [    0.494300]  [<ffffffff8141d3cb>]
> > driver_probe_device+0x7b/0x240
> > >> >> [    0.494385]  [<ffffffff8141d63b>] __driver_attach+0xab/0xb0
> > >> >> [    0.494469]  [<ffffffff8141d590>] ?
> > >> driver_probe_device+0x240/0x240
> > >> >> [    0.494551]  [<ffffffff8141b71e>] bus_for_each_dev+0x5e/0x90
> > >> >> [    0.494634]  [<ffffffff8141cede>] driver_attach+0x1e/0x20
> > >> >> [    0.494718]  [<ffffffff8141ca57>] bus_add_driver+0x117/0x230
> > >> >> [    0.494802]  [<ffffffff8141dd34>] driver_register+0x64/0xf0
> > >> >> [    0.494884]  [<ffffffff812d4c14>]
> > __pci_register_driver+0x64/0x70
> > >> >> [    0.494972]  [<ffffffff81d0319b>] ?
> > uncore_types_init+0x19c/0x19c
> > >> >> [    0.495056]  [<ffffffff81d03312>]
> > intel_uncore_init+0x177/0x41c
> > >> >> [    0.495155]  [<ffffffff81d0319b>] ?
> > uncore_types_init+0x19c/0x19c
> > >> >> [    0.495242]  [<ffffffff8100029e>] do_one_initcall+0x4e/0x170
> > >> >> [    0.495326]  [<ffffffff81071100>] ? parse_args+0x60/0x360
> > >> >> [    0.495411]  [<ffffffff81cfbfb8>]
> > >> kernel_init_freeable+0x106/0x19a
> > >> >> [    0.495497]  [<ffffffff81cfb83b>] ? do_early_param+0x86/0x86
> > >> >> [    0.495582]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
> > >> >> [    0.495666]  [<ffffffff81607efe>] kernel_init+0xe/0xf0
> > >> >> [    0.495749]  [<ffffffff81621f6c>] ret_from_fork+0x7c/0xb0
> > >> >> [    0.495831]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
> > >> >> [    0.495921] ---[ end trace 428f365c054d9a01 ]---
> > >> >> [    0.496196] RAPL PMU detected, hw unit 2^-16 Joules, API unit
> > is
> > >> 2^-32 Joules, 3 fixed counters 163840 ms ovfl timer
> > >> >> [    0.498598] futex hash table entries: 1024 (order: 5, 131072
> > >> bytes)
> > >> >> [    0.498833] audit: initializing netlink subsys (disabled)
> > >> >> [    0.499024] audit: type=2000 audit(1393259866.477:1):
> > initialized
> > >> >> ...
> > >> >>
> > >> >>
> > >> >
> > >
> N�����r��y���b�X��ǧv�^�)޺{.n�+����{�i�b�{ay�\x1dʇڙ�,j\a��f���h���z�\x1e�w���\f���j:+v���w�j�m����\a����zZ+�����ݢj"��!�i


--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Info: mapping multiple BARs. Your kernel is fine.

[Rafael J. Wysocki]

On Thursday, March 20, 2014 03:03:45 AM Zhang, Rui wrote:
> 
> > -----Original Message-----
> > From: Lu, Aaron
> > Sent: Thursday, March 20, 2014 10:24 AM
> > To: Rafael J. Wysocki; Borislav Petkov
> > Cc: lkml; x86@kernel.org; Bjorn Helgaas; Linux PCI; ACPI Devel Maling
> > List; Zhang, Rui; Yinghai Lu; H. Peter Anvin; Stephane Eranian
> > Subject: Re: Info: mapping multiple BARs. Your kernel is fine.
> > Importance: High
> > 
> > On 03/15/2014 10:15 PM, Rafael J. Wysocki wrote:
> > > [CC list rearranged]
> > >
> > > On Monday, February 24, 2014 05:24:00 PM Borislav Petkov wrote:
> > >> This started happening this morning after booting -rc4+tip, let's
> > add
> > >> *everybody* to CC :-)
> > >>
> > >> We have intel_uncore_init, snb_uncore_imc_init_box, uncore_pci_probe
> > >> and other goodies on the stack.
> > >
> > > I've just gone throught this.
> > >
> > > So the problem is that we have the PNP "system" driver whose only
> > > purpose seems to be to reserve system resources so that the PCI layer
> > > doesn't assign them to new devices on hotplug (disclaimer: I didn't
> > > invent it, I only read the code and comments in there).
> > 
> > And to PCI devices which have uninitialized BARs.
> > 
> > >
> > > It does that for ACPI device objects having the "PNP0C02" and
> > "PNP0C01" IDs.
> > >
> > > Apparently, snb_uncore_imc_init_box() steps on a range already
> > > reserved by that driver on your box.  And this doesn't seem to be a
> > > coincidence, because the ACPI device object in question probably
> > > *does* correspond to the memory controller that the uncore driver
> > attempts to use.
> > >
> > > I'm not sure how to address that right now to be honest.  Arguably,
> > > the PNP "system" driver should be replaced with something saner, but
> > > still the resources it claims need to be kept out of reach of the
> > > PCI's resource allocation code.
> > 
> > The quirk_system_pci_resources is meant to disable PNP devices'
> > resource if they collide with any known PCI device's BAR. I'm not sure
> > why it doesn't work here, perhaps the uncore PCI device doesn't have a
> > BAR that falls in the PNP device's resource window?
> >
> I've talked with Yan Zheng, and I was told that this resource "0xfed10000 - 0xfed15fff"
> is got from PCI device register directly, which is not in its BAR range.
> Thus IMO, it is impossible for PNP layer to be aware of this resource.
> 
> BTW, about drivers/pnp/system.c, if its ONLY purpose is to prevent those
> resources from being allocated to uninitialized PCI devices, then IMO,
> the best way to do this is make PCI bus handle those PNP0C01/PNP0C02
> resources directly, probably via a platform callback, say,
> 1. make drivers/pnp/system.c a no-op for PNPACPI, by checking pnp_dev->protocol.

Then we can drop drivers/pnp/system.c entirely I think.

> 2. introduce acpi_check_reserved_resource() to parsing PNP0C01/PNP0C02 resources.
> 3. in PCI bus, invoke acpi_check_reserved_resource() when assigning
>    resources to PCI devices.

Well, sounds reasonable.


> > >
> > >> ...
> > >> [    0.488998] software IO TLB [mem 0xcac30000-0xcec30000] (64MB)
> > mapped at [ffff8800cac30000-ffff8800cec2ffff]
> > >> [    0.489975] resource map sanity check conflict: 0xfed10000
> > 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
> > >> [    0.490079] ------------[ cut here ]------------
> > >> [    0.490204] WARNING: CPU: 2 PID: 1 at arch/x86/mm/ioremap.c:171
> > __ioremap_caller+0x372/0x380()
> > >> [    0.490306] Info: mapping multiple BARs. Your kernel is fine.
> > >> [    0.490371] Modules linked in:
> > >> [    0.490558] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc4+
> > #1
> > >> [    0.490642] Hardware name: LENOVO 2320CTO/2320CTO, BIOS G2ET86WW
> > (2.06 ) 11/13/2012
> > >> [    0.490742]  00000000000000ab ffff880213d01ad8 ffffffff816112e3
> > 0000000000000006
> > >> [    0.491032]  ffff880213d01b28 ffff880213d01b18 ffffffff8104e9bc
> > ffff880213d01b08
> > >> [    0.491343]  ffffc90000c58000 00000000fed10000 00000000fed10000
> > 0000000000006000
> > >> [    0.491631] Call Trace:
> > >> [    0.493337]  [<ffffffff816112e3>] dump_stack+0x4f/0x7c
> > >> [    0.493420]  [<ffffffff8104e9bc>] warn_slowpath_common+0x8c/0xc0
> > >> [    0.493503]  [<ffffffff8104eaa6>] warn_slowpath_fmt+0x46/0x50
> > >> [    0.493588]  [<ffffffff8103f1e2>] __ioremap_caller+0x372/0x380
> > >> [    0.493674]  [<ffffffff810211a2>] ?
> > snb_uncore_imc_init_box+0x62/0x90
> > >> [    0.493761]  [<ffffffff8103f247>] ioremap_nocache+0x17/0x20
> > >> [    0.493846]  [<ffffffff810211a2>]
> > snb_uncore_imc_init_box+0x62/0x90
> > >> [    0.493933]  [<ffffffff81022925>] uncore_pci_probe+0xe5/0x1e0
> > >> [    0.494020]  [<ffffffff812d487e>] local_pci_probe+0x4e/0xa0
> > >> [    0.494104]  [<ffffffff81418a59>] ? get_device+0x19/0x20
> > >> [    0.494213]  [<ffffffff812d5cd1>] pci_device_probe+0xe1/0x130
> > >> [    0.494300]  [<ffffffff8141d3cb>] driver_probe_device+0x7b/0x240
> > >> [    0.494385]  [<ffffffff8141d63b>] __driver_attach+0xab/0xb0
> > >> [    0.494469]  [<ffffffff8141d590>] ?
> > driver_probe_device+0x240/0x240
> > >> [    0.494551]  [<ffffffff8141b71e>] bus_for_each_dev+0x5e/0x90
> > >> [    0.494634]  [<ffffffff8141cede>] driver_attach+0x1e/0x20
> > >> [    0.494718]  [<ffffffff8141ca57>] bus_add_driver+0x117/0x230
> > >> [    0.494802]  [<ffffffff8141dd34>] driver_register+0x64/0xf0
> > >> [    0.494884]  [<ffffffff812d4c14>] __pci_register_driver+0x64/0x70
> > >> [    0.494972]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
> > >> [    0.495056]  [<ffffffff81d03312>] intel_uncore_init+0x177/0x41c
> > >> [    0.495155]  [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
> > >> [    0.495242]  [<ffffffff8100029e>] do_one_initcall+0x4e/0x170
> > >> [    0.495326]  [<ffffffff81071100>] ? parse_args+0x60/0x360
> > >> [    0.495411]  [<ffffffff81cfbfb8>]
> > kernel_init_freeable+0x106/0x19a
> > >> [    0.495497]  [<ffffffff81cfb83b>] ? do_early_param+0x86/0x86
> > >> [    0.495582]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
> > >> [    0.495666]  [<ffffffff81607efe>] kernel_init+0xe/0xf0
> > >> [    0.495749]  [<ffffffff81621f6c>] ret_from_fork+0x7c/0xb0
> > >> [    0.495831]  [<ffffffff81607ef0>] ? rest_init+0xd0/0xd0
> > >> [    0.495921] ---[ end trace 428f365c054d9a01 ]---
> > >> [    0.496196] RAPL PMU detected, hw unit 2^-16 Joules, API unit is
> > 2^-32 Joules, 3 fixed counters 163840 ms ovfl timer
> > >> [    0.498598] futex hash table entries: 1024 (order: 5, 131072
> > bytes)
> > >> [    0.498833] audit: initializing netlink subsys (disabled)
> > >> [    0.499024] audit: type=2000 audit(1393259866.477:1): initialized
> > >> ...
> > >>
> > >>
> > >
> 
> N�����r��y����b�X��ǧv�^�)޺{.n�+����{�i�b�{ay�\x1dʇڙ�,j\a��f���h���z�\x1e�w���\f���j:+v���w�j�m����\a����zZ+�����ݢj"��!�ir

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.

Re: Info: mapping multiple BARs. Your kernel is fine.

[Bjorn Helgaas]

On Wed, Mar 19, 2014 at 9:03 PM, Zhang, Rui <rui.zhang@intel.com> wrote:

> I've talked with Yan Zheng, and I was told that this resource "0xfed10000 - 0xfed15fff"
> is got from PCI device register directly, which is not in its BAR range.
> Thus IMO, it is impossible for PNP layer to be aware of this resource.

Slow down, this isn't quite correct.  The *base* address (0xfed10000)
is from a PCI config register (MCHBAR, at PCI config offset 0x48) [1].
 This is a device-dependent register, so the PCI core knows neither
the base nor the size.

The device consumes address space that is not reported via the
architected PCI mechanism, so the only way to report that space is via
the PNP0C02 ACPI device.  The BIOS has to determine the base and size
based on its knowledge of the hardware.  On this hardware, per the
spec in [1], the region described by MCHBAR is 32KB in size.

The 0x6000 (24KB) size of the region above comes from the driver and
is actually less than what the device consumes.  It is legal for a
driver to request only the area it requires, but the entire area
consumed by the device should be reported via the PNP0C02 device.  The
fact that PNP0C02 reports 16KB but the device actually consumes 32KB
is a BIOS defect.  This probably happened because previous versions of
this chip consumed only 16KB, and the BIOS didn't get updated for the
change.

> BTW, about drivers/pnp/system.c, if its ONLY purpose is to prevent those
> resources from being allocated to uninitialized PCI devices, then IMO,
> the best way to do this is make PCI bus handle those PNP0C01/PNP0C02
> resources directly, probably via a platform callback, say,
> 1. make drivers/pnp/system.c a no-op for PNPACPI, by checking pnp_dev->protocol.
> 2. introduce acpi_check_reserved_resource() to parsing PNP0C01/PNP0C02 resources.
> 3. in PCI bus, invoke acpi_check_reserved_resource() when assigning
>    resources to PCI devices.

The purpose of system.c is indeed to prevent resources from being
allocated to other devices.  This is really a question for Rafael, but
in my opinion this function (reserving resources of PNP/ACPI devices
to prevent their allocation to other devices) should be done for *all*
PNP and ACPI devices, not just the PNP0C01/PNP0C02 devices handled by
system.c.

So I think the best solution would be to move that into the ACPI core
somehow so it happens for all devices.  If we had that, we could get
rid of system.c altogether, and we wouldn't have to do anything
special in PCI.  This is much easier to say than to do, however,
because there are all kinds of issues with legacy resource
reservations, and we currently can't really deal with overlapping
resources.

Bjorn

[1] https://www-ssl.intel.com/content/www/us/en/processors/core/4th-gen-core-family-desktop-vol-2-datasheet,
sec. 3.1.2 on p. 61

Re: Info: mapping multiple BARs. Your kernel is fine.

[Rafael J. Wysocki]

On Thursday, March 20, 2014 10:45:52 AM Bjorn Helgaas wrote:
> On Wed, Mar 19, 2014 at 9:03 PM, Zhang, Rui <rui.zhang@intel.com> wrote:
> 
> > I've talked with Yan Zheng, and I was told that this resource "0xfed10000 - 0xfed15fff"
> > is got from PCI device register directly, which is not in its BAR range.
> > Thus IMO, it is impossible for PNP layer to be aware of this resource.
> 
> Slow down, this isn't quite correct.  The *base* address (0xfed10000)
> is from a PCI config register (MCHBAR, at PCI config offset 0x48) [1].
>  This is a device-dependent register, so the PCI core knows neither
> the base nor the size.
> 
> The device consumes address space that is not reported via the
> architected PCI mechanism, so the only way to report that space is via
> the PNP0C02 ACPI device.  The BIOS has to determine the base and size
> based on its knowledge of the hardware.  On this hardware, per the
> spec in [1], the region described by MCHBAR is 32KB in size.
> 
> The 0x6000 (24KB) size of the region above comes from the driver and
> is actually less than what the device consumes.  It is legal for a
> driver to request only the area it requires, but the entire area
> consumed by the device should be reported via the PNP0C02 device.  The
> fact that PNP0C02 reports 16KB but the device actually consumes 32KB
> is a BIOS defect.  This probably happened because previous versions of
> this chip consumed only 16KB, and the BIOS didn't get updated for the
> change.
> 
> > BTW, about drivers/pnp/system.c, if its ONLY purpose is to prevent those
> > resources from being allocated to uninitialized PCI devices, then IMO,
> > the best way to do this is make PCI bus handle those PNP0C01/PNP0C02
> > resources directly, probably via a platform callback, say,
> > 1. make drivers/pnp/system.c a no-op for PNPACPI, by checking pnp_dev->protocol.
> > 2. introduce acpi_check_reserved_resource() to parsing PNP0C01/PNP0C02 resources.
> > 3. in PCI bus, invoke acpi_check_reserved_resource() when assigning
> >    resources to PCI devices.
> 
> The purpose of system.c is indeed to prevent resources from being
> allocated to other devices.  This is really a question for Rafael, but
> in my opinion this function (reserving resources of PNP/ACPI devices
> to prevent their allocation to other devices) should be done for *all*
> PNP and ACPI devices, not just the PNP0C01/PNP0C02 devices handled by
> system.c.
> 
> So I think the best solution would be to move that into the ACPI core
> somehow so it happens for all devices.

Well, I think you got to the bottom of this, but that's something we can
do long-term.  Still, we need to find a short-term solution for the
particular issue at hand.

> If we had that, we could get
> rid of system.c altogether, and we wouldn't have to do anything
> special in PCI.  This is much easier to say than to do, however,
> because there are all kinds of issues with legacy resource
> reservations, and we currently can't really deal with overlapping
> resources.

Indeed.

All above said, appended is the relevant piece of the DSDT from the machine
in question (and that is in the PCI host bridge scope).

So we have a PCI device with an ACPI object called LPC which has a child
called SIO and the _HID of that child is "PNP0C02".

I'm not sure if the way system.c handles this is correct in this particular
case to be honest.


            Device (LPC)
            {
                Name (_ADR, 0x001F0000)
                Name (_S3D, 0x03)
                Name (RID, 0x00)
                Device (SIO)
                {
                    Name (_HID, EisaId ("PNP0C02"))
                    Name (_UID, 0x00)
                    Name (SCRS, ResourceTemplate ()
                    {
                        IO (Decode16,
                            0x0010,             // Range Minimum
                            0x0010,             // Range Maximum
                            0x01,               // Alignment
                            0x10,               // Length
                            )
                        IO (Decode16,
                            0x0090,             // Range Minimum
                            0x0090,             // Range Maximum
                            0x01,               // Alignment
                            0x10,               // Length
                            )
                        IO (Decode16,
                            0x0024,             // Range Minimum
                            0x0024,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x0028,             // Range Minimum
                            0x0028,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x002C,             // Range Minimum
                            0x002C,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x0030,             // Range Minimum
                            0x0030,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x0034,             // Range Minimum
                            0x0034,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x0038,             // Range Minimum
                            0x0038,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x003C,             // Range Minimum
                            0x003C,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x00A4,             // Range Minimum
                            0x00A4,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x00A8,             // Range Minimum
                            0x00A8,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x00AC,             // Range Minimum
                            0x00AC,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x00B0,             // Range Minimum
                            0x00B0,             // Range Maximum
                            0x01,               // Alignment
                            0x06,               // Length
                            )
                        IO (Decode16,
                            0x00B8,             // Range Minimum
                            0x00B8,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x00BC,             // Range Minimum
                            0x00BC,             // Range Maximum
                            0x01,               // Alignment
                            0x02,               // Length
                            )
                        IO (Decode16,
                            0x0050,             // Range Minimum
                            0x0050,             // Range Maximum
                            0x01,               // Alignment
                            0x04,               // Length
                            )
                        IO (Decode16,
                            0x0072,             // Range Minimum
                            0x0072,             // Range Maximum
                            0x01,               // Alignment
                            0x06,               // Length
                            )
                        IO (Decode16,
                            0x0400,             // Range Minimum
                            0x0400,             // Range Maximum
                            0x01,               // Alignment
                            0x80,               // Length
                            )
                        IO (Decode16,
                            0x0500,             // Range Minimum
                            0x0500,             // Range Maximum
                            0x01,               // Alignment
                            0x80,               // Length
                            )
                        IO (Decode16,
                            0x0800,             // Range Minimum
                            0x0800,             // Range Maximum
                            0x01,               // Alignment
                            0x10,               // Length
                            )
                        IO (Decode16,
                            0x15E0,             // Range Minimum
                            0x15E0,             // Range Maximum
                            0x01,               // Alignment
                            0x10,               // Length
                            )
                        IO (Decode16,
                            0x1600,             // Range Minimum
                            0x1600,             // Range Maximum
                            0x01,               // Alignment
                            0x80,               // Length
                            )
                        Memory32Fixed (ReadWrite,
                            0xF8000000,         // Address Base
                            0x04000000,         // Address Length
                            )
                        Memory32Fixed (ReadWrite,
                            0x00000000,         // Address Base
                            0x00001000,         // Address Length
                            _Y26)
                        Memory32Fixed (ReadWrite,
                            0xFED1C000,         // Address Base
                            0x00004000,         // Address Length
                            )
                        Memory32Fixed (ReadWrite,
                            0xFED10000,         // Address Base
                            0x00004000,         // Address Length
                            )
                        Memory32Fixed (ReadWrite,
                            0xFED18000,         // Address Base
                            0x00001000,         // Address Length
                            )
                        Memory32Fixed (ReadWrite,
                            0xFED19000,         // Address Base
                            0x00001000,         // Address Length
                            )
                        Memory32Fixed (ReadWrite,
                            0xFED45000,         // Address Base
                            0x00007000,         // Address Length
                            )
                    })
                    CreateDWordField (SCRS, \_SB.PCI0.LPC.SIO._Y26._BAS, TRMB)
                    Method (_CRS, 0, NotSerialized)
                    {
                        Store (\TBAB, TRMB)
                        If (LEqual (\_SB.PCI0.LPC.TPM._STA (), 0x0F))
                        {
                            Return (SCRS)
                        }
                        Else
                        {
                            Subtract (SizeOf (SCRS), 0x02, Local0)
                            Name (BUF0, Buffer (Local0) {})
                            Add (Local0, SizeOf (\_SB.PCI0.LPC.TPM.BUF1), Local0)
                            Name (BUF1, Buffer (Local0) {})
                            Store (SCRS, BUF0)
                            Concatenate (BUF0, \_SB.PCI0.LPC.TPM.BUF1, BUF1)
                            Return (BUF1)
                        }
                    }
                }

Re: Info: mapping multiple BARs. Your kernel is fine.

[Bjorn Helgaas]

On Thu, Mar 20, 2014 at 2:55 PM, Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
> On Thursday, March 20, 2014 10:45:52 AM Bjorn Helgaas wrote:
>> The purpose of system.c is indeed to prevent resources from being
>> allocated to other devices.  This is really a question for Rafael, but
>> in my opinion this function (reserving resources of PNP/ACPI devices
>> to prevent their allocation to other devices) should be done for *all*
>> PNP and ACPI devices, not just the PNP0C01/PNP0C02 devices handled by
>> system.c.
>>
>> So I think the best solution would be to move that into the ACPI core
>> somehow so it happens for all devices.
>
> Well, I think you got to the bottom of this, but that's something we can
> do long-term.  Still, we need to find a short-term solution for the
> particular issue at hand.

Right.  Even if we had this long-term solution, we'd still have
Stephane's current problem, because the PNP0C02 _CRS is still wrong.

We do have a drivers/pnp/quirks.c where we could conceivably adjust
the PNP resource if we found the matching PCI device and MCHBAR.  That
should solve Stephane's problem even with the current
drivers/pnp/system.c.

Bjorn

Re: Info: mapping multiple BARs. Your kernel is fine.

[Borislav Petkov]

On Thu, Mar 20, 2014 at 02:48:30PM -0600, Bjorn Helgaas wrote:
> Right.  Even if we had this long-term solution, we'd still have
> Stephane's current problem, because the PNP0C02 _CRS is still wrong.
> 
> We do have a drivers/pnp/quirks.c where we could conceivably adjust
> the PNP resource if we found the matching PCI device and MCHBAR.  That
> should solve Stephane's problem even with the current
> drivers/pnp/system.c.

Guys, this still triggers in -rc1. Do we have a fix or something
testable at least?

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

RE: Info: mapping multiple BARs. Your kernel is fine.

[Zhang, Rui]

> -----Original Message-----
> From: Borislav Petkov [mailto:bp@alien8.de]
> Sent: Wednesday, April 16, 2014 12:04 PM
> To: Bjorn Helgaas; Rafael J. Wysocki
> Cc: Zhang, Rui; Lu, Aaron; lkml; x86@kernel.org; Linux PCI; ACPI Devel
> Maling List; Yinghai Lu; H. Peter Anvin; Stephane Eranian; Yan, Zheng Z
> Subject: Re: Info: mapping multiple BARs. Your kernel is fine.
> Importance: High
> 
> On Thu, Mar 20, 2014 at 02:48:30PM -0600, Bjorn Helgaas wrote:
> > Right.  Even if we had this long-term solution, we'd still have
> > Stephane's current problem, because the PNP0C02 _CRS is still wrong.
> >
> > We do have a drivers/pnp/quirks.c where we could conceivably adjust
> > the PNP resource if we found the matching PCI device and MCHBAR.
> That
> > should solve Stephane's problem even with the current
> > drivers/pnp/system.c.
> 
> Guys, this still triggers in -rc1. Do we have a fix or something
> testable at least?
> 
Could you please attach the dmesg output after a fresh boot in -rc1?

Thanks,
rui
> Thanks.
> 
> --
> Regards/Gruss,
>     Boris.
> 
> Sent from a fat crate under my desk. Formatting is fine.
> --

Re: Info: mapping multiple BARs. Your kernel is fine.

[Bjorn Helgaas]

On Wed, Apr 16, 2014 at 09:04:04PM +0200, Borislav Petkov wrote:
> On Thu, Mar 20, 2014 at 02:48:30PM -0600, Bjorn Helgaas wrote:
> > Right.  Even if we had this long-term solution, we'd still have
> > Stephane's current problem, because the PNP0C02 _CRS is still wrong.
> > 
> > We do have a drivers/pnp/quirks.c where we could conceivably adjust
> > the PNP resource if we found the matching PCI device and MCHBAR.  That
> > should solve Stephane's problem even with the current
> > drivers/pnp/system.c.
> 
> Guys, this still triggers in -rc1. Do we have a fix or something
> testable at least?

Hi Boris,

Can you try the patch below?



PNP: Work around Haswell BIOS defect in MCH area reporting

From: Bjorn Helgaas <bhelgaas@google.com>

Work around a Haswell BIOS defect that causes part of the MCH area to be
unreported.

MCHBAR is not an architected PCI BAR, so MCH space is usually reported as a
PNP0C02 resource.  The MCH space was 16KB prior to Haswell, but it is 32KB
in Haswell.  Some Haswell BIOSes still report a PNP0C02 resource that is
only 16KB, which means the rest of the MCH space is consumed but
unreported.

This can cause resource map sanity check warnings or (theoretically) a
device conflict if we assigned the unreported space to another device.

The Intel perf event uncore driver tripped over this when it claimed the
MCH region:

  resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
  Info: mapping multiple BARs. Your kernel is fine.

To prevent this, if we find a PNP0C02 resource that covers part of the MCH
space, extend it to cover the entire space.

Link: http://lkml.kernel.org/r/20140224162400.GE16457@pd.tnic
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pnp/quirks.c |   52 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
index 258fef272ea7..023edf592371 100644
--- a/drivers/pnp/quirks.c
+++ b/drivers/pnp/quirks.c
@@ -334,6 +334,57 @@ static void quirk_amd_mmconfig_area(struct pnp_dev *dev)
 }
 #endif
 
+static void quirk_intel_haswell_mch(struct pnp_dev *dev)
+{
+	struct pci_dev *host;
+	u32 addr_lo, addr_hi;
+	struct pci_bus_region region;
+	struct resource mch;
+	struct pnp_resource *pnp_res;
+	struct resource *res;
+
+	host = pci_get_device(PCI_VENDOR_ID_INTEL, 0x0c00, NULL);
+	if (!host)
+		return;
+
+	/*
+	 * MCHBAR is not an architected PCI BAR, so MCH space is usually
+	 * reported as a PNP0C02 resource.  The MCH space was 16KB prior to
+	 * Haswell, but it is 32KB in Haswell.  Some Haswell BIOSes still
+	 * report a PNP0C02 resource that is only 16KB, which means the
+	 * rest of the MCH space is consumed but unreported.
+	 */
+
+	/*
+	 * Read MCHBAR for Host Member Mapped Register Range Base
+	 * https://www-ssl.intel.com/content/www/us/en/processors/core/4th-gen-core-family-desktop-vol-2-datasheet
+	 * Sec 3.1.12.
+	 */
+	pci_read_config_dword(host, 0x48, &addr_lo);
+	region.start = addr_lo & ~0x7fff;
+	pci_read_config_dword(host, 0x4c, &addr_hi);
+	region.start |= (dma_addr_t) addr_hi << 32;
+	region.end = region.start + 32*1024 - 1 ;
+	pcibios_bus_to_resource(host->bus, &mch, &region);
+
+	list_for_each_entry(pnp_res, &dev->resources, list) {
+		res = &pnp_res->res;
+		if (res->end < mch.start || res->start > mch.end)
+			continue;	/* no overlap */
+		if (res->start == mch.start && res->end == mch.end)
+			continue;	/* exact match */
+
+		dev_info(&dev->dev, FW_BUG
+			 "%pR covers only part of Intel Haswell MCH; extending to %pR\n",
+			 res, &mch);
+		res->start = mch.start;
+		res->end = mch.end;
+		break;
+	}
+
+	pci_dev_put(host);
+}
+
 /*
  *  PnP Quirks
  *  Cards or devices that need some tweaking due to incomplete resource info
@@ -364,6 +415,7 @@ static struct pnp_fixup pnp_fixups[] = {
 #ifdef CONFIG_AMD_NB
 	{"PNP0c01", quirk_amd_mmconfig_area},
 #endif
+	{"PNP0c02", quirk_intel_haswell_mch},
 	{""}
 };
 

Re: Info: mapping multiple BARs. Your kernel is fine.

[Dave Jones]

On Wed, Apr 16, 2014 at 02:31:38PM -0600, Bjorn Helgaas wrote:
 > On Wed, Apr 16, 2014 at 09:04:04PM +0200, Borislav Petkov wrote:
 > > On Thu, Mar 20, 2014 at 02:48:30PM -0600, Bjorn Helgaas wrote:
 > > > Right.  Even if we had this long-term solution, we'd still have
 > > > Stephane's current problem, because the PNP0C02 _CRS is still wrong.
 > > > 
 > > > We do have a drivers/pnp/quirks.c where we could conceivably adjust
 > > > the PNP resource if we found the matching PCI device and MCHBAR.  That
 > > > should solve Stephane's problem even with the current
 > > > drivers/pnp/system.c.
 > > 
 > > Guys, this still triggers in -rc1. Do we have a fix or something
 > > testable at least?
 > 
 > Hi Boris,
 > 
 > Can you try the patch below?

I'm seeing the exact same message on my thinkpad t430s.
When I try your patch, modesetting no longer works. When it tries
to change to the framebuffer I get a black screen and lockup.
If I boot with nomodeset it locks up when it gets to X.
It all scrolls by too fast to read, but it looks like there's still
a backtrace present.

	Dave

Re: Info: mapping multiple BARs. Your kernel is fine.

[Bjorn Helgaas]

On Wed, Apr 16, 2014 at 06:31:22PM -0400, Dave Jones wrote:
> On Wed, Apr 16, 2014 at 02:31:38PM -0600, Bjorn Helgaas wrote:
>  > On Wed, Apr 16, 2014 at 09:04:04PM +0200, Borislav Petkov wrote:
>  > > On Thu, Mar 20, 2014 at 02:48:30PM -0600, Bjorn Helgaas wrote:
>  > > > Right.  Even if we had this long-term solution, we'd still have
>  > > > Stephane's current problem, because the PNP0C02 _CRS is still wrong.
>  > > > 
>  > > > We do have a drivers/pnp/quirks.c where we could conceivably adjust
>  > > > the PNP resource if we found the matching PCI device and MCHBAR.  That
>  > > > should solve Stephane's problem even with the current
>  > > > drivers/pnp/system.c.
>  > > 
>  > > Guys, this still triggers in -rc1. Do we have a fix or something
>  > > testable at least?
>  > 
>  > Hi Boris,
>  > 
>  > Can you try the patch below?
> 
> I'm seeing the exact same message on my thinkpad t430s.
> When I try your patch, modesetting no longer works. When it tries
> to change to the framebuffer I get a black screen and lockup.
> If I boot with nomodeset it locks up when it gets to X.
> It all scrolls by too fast to read, but it looks like there's still
> a backtrace present.

Ouch, sorry about that.  I do see a bug in my patch (fixed below), but I
don't see how that could cause what you're seeing.  Maybe I could figure
out something from this info (this can be from a kernel without my patch):

    - dmesg log
    - output of "find /sys/devices/pnp0 -name id -o -name resources | xargs grep ."
    - output of "sudo lspci -s00:00.0 -xxx"



PNP: Work around Haswell BIOS defect in MCH area reporting

From: Bjorn Helgaas <bhelgaas@google.com>

Work around a Haswell BIOS defect that causes part of the MCH area to be
unreported.

MCHBAR is not an architected PCI BAR, so MCH space is usually reported as a
PNP0C02 resource.  The MCH space was 16KB prior to Haswell, but it is 32KB
in Haswell.  Some Haswell BIOSes still report a PNP0C02 resource that is
only 16KB, which means the rest of the MCH space is consumed but
unreported.

This can cause resource map sanity check warnings or (theoretically) a
device conflict if we assigned the unreported space to another device.

The Intel perf event uncore driver tripped over this when it claimed the
MCH region:

  resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
  Info: mapping multiple BARs. Your kernel is fine.

To prevent this, if we find a PNP0C02 resource that covers part of the MCH
space, extend it to cover the entire space.

Link: http://lkml.kernel.org/r/20140224162400.GE16457@pd.tnic
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pnp/quirks.c |   55 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
index 258fef272ea7..8402088d4145 100644
--- a/drivers/pnp/quirks.c
+++ b/drivers/pnp/quirks.c
@@ -334,6 +334,60 @@ static void quirk_amd_mmconfig_area(struct pnp_dev *dev)
 }
 #endif
 
+static void quirk_intel_haswell_mch(struct pnp_dev *dev)
+{
+	struct pci_dev *host;
+	u32 addr_lo, addr_hi;
+	struct pci_bus_region region;
+	struct resource mch;
+	struct pnp_resource *pnp_res;
+	struct resource *res;
+
+	host = pci_get_device(PCI_VENDOR_ID_INTEL, 0x0c00, NULL);
+	if (!host)
+		return;
+
+	/*
+	 * MCHBAR is not an architected PCI BAR, so MCH space is usually
+	 * reported as a PNP0C02 resource.  The MCH space was 16KB prior to
+	 * Haswell, but it is 32KB in Haswell.  Some Haswell BIOSes still
+	 * report a PNP0C02 resource that is only 16KB, which means the
+	 * rest of the MCH space is consumed but unreported.
+	 */
+
+	/*
+	 * Read MCHBAR for Host Member Mapped Register Range Base
+	 * https://www-ssl.intel.com/content/www/us/en/processors/core/4th-gen-core-family-desktop-vol-2-datasheet
+	 * Sec 3.1.12.
+	 */
+	pci_read_config_dword(host, 0x48, &addr_lo);
+	region.start = addr_lo & ~0x7fff;
+	pci_read_config_dword(host, 0x4c, &addr_hi);
+	region.start |= (dma_addr_t) addr_hi << 32;
+	region.end = region.start + 32*1024 - 1 ;
+
+	memset(&mch, 0, sizeof(mch));
+	mch.flags = IORESOURCE_MEM;
+	pcibios_bus_to_resource(host->bus, &mch, &region);
+
+	list_for_each_entry(pnp_res, &dev->resources, list) {
+		res = &pnp_res->res;
+		if (res->end < mch.start || res->start > mch.end)
+			continue;	/* no overlap */
+		if (res->start == mch.start && res->end == mch.end)
+			continue;	/* exact match */
+
+		dev_info(&dev->dev, FW_BUG
+			 "%pR covers only part of Intel Haswell MCH; extending to %pR\n",
+			 res, &mch);
+		res->start = mch.start;
+		res->end = mch.end;
+		break;
+	}
+
+	pci_dev_put(host);
+}
+
 /*
  *  PnP Quirks
  *  Cards or devices that need some tweaking due to incomplete resource info
@@ -364,6 +418,7 @@ static struct pnp_fixup pnp_fixups[] = {
 #ifdef CONFIG_AMD_NB
 	{"PNP0c01", quirk_amd_mmconfig_area},
 #endif
+	{"PNP0c02", quirk_intel_haswell_mch},
 	{""}
 };
 

Re: Info: mapping multiple BARs. Your kernel is fine.

[Dave Jones]

[-- Attachment #1: Type: text/plain, Size: 903 bytes --]

On Wed, Apr 16, 2014 at 04:56:00PM -0600, Bjorn Helgaas wrote:
 
 > > I'm seeing the exact same message on my thinkpad t430s.
 > > When I try your patch, modesetting no longer works. When it tries
 > > to change to the framebuffer I get a black screen and lockup.
 > > If I boot with nomodeset it locks up when it gets to X.
 > > It all scrolls by too fast to read, but it looks like there's still
 > > a backtrace present.
 > 
 > Ouch, sorry about that.  I do see a bug in my patch (fixed below), but I
 > don't see how that could cause what you're seeing.

updated diff made no difference fwiw.

 > Maybe I could figure
 > out something from this info (this can be from a kernel without my patch):
 > 
 >     - dmesg log
 >     - output of "find /sys/devices/pnp0 -name id -o -name resources | xargs grep ."
 >     - output of "sudo lspci -s00:00.0 -xxx"

attached from a fedora build of rc1.

	Dave


[-- Attachment #2: pnp.txt --]
[-- Type: text/plain, Size: 4027 bytes --]

/sys/devices/pnp0/00:00/id:PNP0c01
/sys/devices/pnp0/00:00/resources:state = active
/sys/devices/pnp0/00:00/resources:mem 0x0-0x9ffff
/sys/devices/pnp0/00:00/resources:mem 0xc0000-0xc3fff
/sys/devices/pnp0/00:00/resources:mem 0xc4000-0xc7fff
/sys/devices/pnp0/00:00/resources:mem 0xc8000-0xcbfff
/sys/devices/pnp0/00:00/resources:mem 0xcc000-0xcffff
/sys/devices/pnp0/00:00/resources:mem 0xd0000-0xd3fff
/sys/devices/pnp0/00:00/resources:mem 0xd4000-0xd7fff
/sys/devices/pnp0/00:00/resources:mem 0xd8000-0xdbfff
/sys/devices/pnp0/00:00/resources:mem 0xdc000-0xdffff
/sys/devices/pnp0/00:00/resources:mem 0xe0000-0xe3fff
/sys/devices/pnp0/00:00/resources:mem 0xe4000-0xe7fff
/sys/devices/pnp0/00:00/resources:mem 0xe8000-0xebfff
/sys/devices/pnp0/00:00/resources:mem 0xec000-0xeffff
/sys/devices/pnp0/00:00/resources:mem 0xf0000-0xfffff
/sys/devices/pnp0/00:00/resources:mem 0x100000-0xbf9fffff
/sys/devices/pnp0/00:00/resources:mem 0xfec00000-0xfed3ffff
/sys/devices/pnp0/00:00/resources:mem 0xfed4c000-0xffffffff
/sys/devices/pnp0/00:01/id:PNP0c02
/sys/devices/pnp0/00:01/resources:state = active
/sys/devices/pnp0/00:01/resources:io 0x10-0x1f
/sys/devices/pnp0/00:01/resources:io 0x90-0x9f
/sys/devices/pnp0/00:01/resources:io 0x24-0x25
/sys/devices/pnp0/00:01/resources:io 0x28-0x29
/sys/devices/pnp0/00:01/resources:io 0x2c-0x2d
/sys/devices/pnp0/00:01/resources:io 0x30-0x31
/sys/devices/pnp0/00:01/resources:io 0x34-0x35
/sys/devices/pnp0/00:01/resources:io 0x38-0x39
/sys/devices/pnp0/00:01/resources:io 0x3c-0x3d
/sys/devices/pnp0/00:01/resources:io 0xa4-0xa5
/sys/devices/pnp0/00:01/resources:io 0xa8-0xa9
/sys/devices/pnp0/00:01/resources:io 0xac-0xad
/sys/devices/pnp0/00:01/resources:io 0xb0-0xb5
/sys/devices/pnp0/00:01/resources:io 0xb8-0xb9
/sys/devices/pnp0/00:01/resources:io 0xbc-0xbd
/sys/devices/pnp0/00:01/resources:io 0x50-0x53
/sys/devices/pnp0/00:01/resources:io 0x72-0x77
/sys/devices/pnp0/00:01/resources:io 0x400-0x47f
/sys/devices/pnp0/00:01/resources:io 0x500-0x57f
/sys/devices/pnp0/00:01/resources:io 0x800-0x80f
/sys/devices/pnp0/00:01/resources:io 0x15e0-0x15ef
/sys/devices/pnp0/00:01/resources:io 0x1600-0x167f
/sys/devices/pnp0/00:01/resources:mem 0xf8000000-0xfbffffff
/sys/devices/pnp0/00:01/resources:mem disabled
/sys/devices/pnp0/00:01/resources:mem 0xfed1c000-0xfed1ffff
/sys/devices/pnp0/00:01/resources:mem 0xfed10000-0xfed13fff
/sys/devices/pnp0/00:01/resources:mem 0xfed18000-0xfed18fff
/sys/devices/pnp0/00:01/resources:mem 0xfed19000-0xfed19fff
/sys/devices/pnp0/00:01/resources:mem 0xfed45000-0xfed4bfff
/sys/devices/pnp0/00:02/id:PNP0103
/sys/devices/pnp0/00:02/resources:state = active
/sys/devices/pnp0/00:02/resources:mem 0xfed00000-0xfed003ff
/sys/devices/pnp0/00:03/id:PNP0200
/sys/devices/pnp0/00:03/resources:state = active
/sys/devices/pnp0/00:03/resources:io 0x0-0xf
/sys/devices/pnp0/00:03/resources:io 0x80-0x8f
/sys/devices/pnp0/00:03/resources:io 0xc0-0xdf
/sys/devices/pnp0/00:03/resources:dma 4
/sys/devices/pnp0/00:04/id:PNP0800
/sys/devices/pnp0/00:04/resources:state = active
/sys/devices/pnp0/00:04/resources:io 0x61-0x61
/sys/devices/pnp0/00:05/id:PNP0c04
/sys/devices/pnp0/00:05/resources:state = active
/sys/devices/pnp0/00:05/resources:io 0xf0-0xf0
/sys/devices/pnp0/00:05/resources:irq 13
/sys/devices/pnp0/00:06/id:PNP0b00
/sys/devices/pnp0/00:06/resources:state = active
/sys/devices/pnp0/00:06/resources:io 0x70-0x71
/sys/devices/pnp0/00:06/resources:irq 8
/sys/devices/pnp0/00:07/id:LEN0071
/sys/devices/pnp0/00:07/id:PNP0303
/sys/devices/pnp0/00:07/resources:state = active
/sys/devices/pnp0/00:07/resources:io 0x60-0x60
/sys/devices/pnp0/00:07/resources:io 0x64-0x64
/sys/devices/pnp0/00:07/resources:irq 1
/sys/devices/pnp0/00:08/id:LEN0015
/sys/devices/pnp0/00:08/id:PNP0f13
/sys/devices/pnp0/00:08/resources:state = active
/sys/devices/pnp0/00:08/resources:irq 12
/sys/devices/pnp0/00:09/id:SMO1200
/sys/devices/pnp0/00:09/id:PNP0c31
/sys/devices/pnp0/00:09/resources:state = active
/sys/devices/pnp0/00:09/resources:mem 0xfed40000-0xfed44fff


[-- Attachment #3: pci --]
[-- Type: text/plain, Size: 920 bytes --]

00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00: 86 80 54 01 06 00 90 20 09 00 00 06 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 aa 17 fb 21
30: 00 00 00 00 e0 00 00 00 00 00 00 00 00 00 00 00
40: 01 90 d1 fe 00 00 00 00 01 00 d1 fe 00 00 00 00
50: 11 02 00 00 19 00 00 00 07 00 90 bf 01 00 00 bb
60: 05 00 00 f8 00 00 00 00 01 80 d1 fe 00 00 00 00
70: 00 00 00 fe 00 00 00 00 00 0c 00 fe 7f 00 00 00
80: 10 11 11 11 11 11 11 00 1a 00 00 00 00 00 00 00
90: 01 00 00 00 01 00 00 00 01 00 50 3e 01 00 00 00
a0: 01 00 00 00 01 00 00 00 01 00 60 3e 01 00 00 00
b0: 01 00 a0 bb 01 00 80 bb 01 00 00 bb 01 00 a0 bf
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 09 00 0c 01 9b 61 00 82 d0 00 e8 76 00 00 00 00
f0: 00 00 00 01 00 00 00 00 c8 0f 09 00 00 00 00 00


[-- Attachment #4: dmesg --]
[-- Type: text/plain, Size: 37382 bytes --]

[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 3.15.0-0.rc1.git0.1.fc21.x86_64 (mockbuild@bkernel02) (gcc version 4.9.0 20140411 (Red Hat 4.9.0-0.10) (GCC) ) #1 SMP Mon Apr 14 15:42:28 UTC 2014
[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.15.0-0.rc1.git0.1.fc21.x86_64 root=/dev/mapper/luks-88d41cc3-dbf6-42da-be04-55c0b18fc495 ro rd.luks.uuid=luks-a022e7c3-2439-4570-a0a0-f2bc1ed10c93 rd.luks.uuid=luks-88d41cc3-dbf6-42da-be04-55c0b18fc495 biosdevname=0 vconsole.font=latarcyrheb-sun16 rdshell consoleblank=0 console=ttyUSB0,115200 console=tty0 pause_on_oops=30 SYSFONT=default8x9 LANG=en_US.UTF-8
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009d7ff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009d800-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001fffffff] usable
[    0.000000] BIOS-e820: [mem 0x0000000020000000-0x00000000201fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000020200000-0x0000000040003fff] usable
[    0.000000] BIOS-e820: [mem 0x0000000040004000-0x0000000040004fff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000040005000-0x00000000aed2ffff] usable
[    0.000000] BIOS-e820: [mem 0x00000000aed30000-0x00000000bae9efff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000bae9f000-0x00000000baf9efff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x00000000baf9f000-0x00000000baffefff] ACPI data
[    0.000000] BIOS-e820: [mem 0x00000000bafff000-0x00000000bf9fffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed08000-0x00000000fed08fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed10000-0x00000000fed19fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000ffc00000-0x00000000ffffffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000013e5fffff] usable
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.7 present.
[    0.000000] DMI: LENOVO 2356JK8/2356JK8, BIOS G7ET94WW (2.54 ) 04/30/2013
[    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] e820: last_pfn = 0x13e600 max_arch_pfn = 0x400000000
[    0.000000] MTRR default type: uncachable
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-FFFFF write-protect
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 0FFC00000 mask FFFC00000 write-protect
[    0.000000]   1 base 000000000 mask F80000000 write-back
[    0.000000]   2 base 080000000 mask FC0000000 write-back
[    0.000000]   3 base 0BC000000 mask FFC000000 uncachable
[    0.000000]   4 base 0BB000000 mask FFF000000 uncachable
[    0.000000]   5 base 100000000 mask FC0000000 write-back
[    0.000000]   6 base 13F000000 mask FFF000000 uncachable
[    0.000000]   7 base 13E800000 mask FFF800000 uncachable
[    0.000000]   8 base 13E600000 mask FFFE00000 uncachable
[    0.000000]   9 disabled
[    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
[    0.000000] e820: last_pfn = 0xaed30 max_arch_pfn = 0x400000000
[    0.000000] found SMP MP-table at [mem 0x000f0100-0x000f010f] mapped at [ffff8800000f0100]
[    0.000000] Base memory trampoline at [ffff880000097000] 97000 size 24576
[    0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff]
[    0.000000]  [mem 0x00000000-0x000fffff] page 4k
[    0.000000] BRK [0x02033000, 0x02033fff] PGTABLE
[    0.000000] BRK [0x02034000, 0x02034fff] PGTABLE
[    0.000000] BRK [0x02035000, 0x02035fff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x13e400000-0x13e5fffff]
[    0.000000]  [mem 0x13e400000-0x13e5fffff] page 2M
[    0.000000] BRK [0x02036000, 0x02036fff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x13c000000-0x13e3fffff]
[    0.000000]  [mem 0x13c000000-0x13e3fffff] page 2M
[    0.000000] init_memory_mapping: [mem 0x100000000-0x13bffffff]
[    0.000000]  [mem 0x100000000-0x13bffffff] page 2M
[    0.000000] init_memory_mapping: [mem 0x00100000-0x1fffffff]
[    0.000000]  [mem 0x00100000-0x001fffff] page 4k
[    0.000000]  [mem 0x00200000-0x1fffffff] page 2M
[    0.000000] init_memory_mapping: [mem 0x20200000-0x40003fff]
[    0.000000]  [mem 0x20200000-0x3fffffff] page 2M
[    0.000000]  [mem 0x40000000-0x40003fff] page 4k
[    0.000000] BRK [0x02037000, 0x02037fff] PGTABLE
[    0.000000] BRK [0x02038000, 0x02038fff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x40005000-0xaed2ffff]
[    0.000000]  [mem 0x40005000-0x401fffff] page 4k
[    0.000000]  [mem 0x40200000-0xaebfffff] page 2M
[    0.000000]  [mem 0xaec00000-0xaed2ffff] page 4k
[    0.000000] RAMDISK: [mem 0x35b6f000-0x36daffff]
[    0.000000] ACPI: RSDP 0x00000000000F0120 000024 (v02 LENOVO)
[    0.000000] ACPI: XSDT 0x00000000BAFFE170 0000BC (v01 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: FACP 0x00000000BAFE6000 00010C (v05 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: DSDT 0x00000000BAFE8000 010B02 (v01 LENOVO TP-G7    00002540 INTL 20061109)
[    0.000000] ACPI: FACS 0x00000000BAF5A000 000040
[    0.000000] ACPI: SLIC 0x00000000BAFFD000 000176 (v01 LENOVO TP-G7    00002540 PTL  00000001)
[    0.000000] ACPI: TCPA 0x00000000BAFFC000 000032 (v02 PTL    LENOVO   06040000 LNVO 00000001)
[    0.000000] ACPI: SSDT 0x00000000BAFFB000 000408 (v01 LENOVO TP-SSDT2 00000200 INTL 20061109)
[    0.000000] ACPI: SSDT 0x00000000BAFFA000 000033 (v01 LENOVO TP-SSDT1 00000100 INTL 20061109)
[    0.000000] ACPI: SSDT 0x00000000BAFF9000 000797 (v01 LENOVO SataAhci 00001000 INTL 20061109)
[    0.000000] ACPI: HPET 0x00000000BAFE4000 000038 (v01 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: APIC 0x00000000BAFE3000 000098 (v01 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: MCFG 0x00000000BAFE2000 00003C (v01 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: ECDT 0x00000000BAFE1000 000052 (v01 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: FPDT 0x00000000BAFE0000 000064 (v01 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: ASF! 0x00000000BAFE7000 0000A5 (v32 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: UEFI 0x00000000BAFDF000 00003E (v01 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: UEFI 0x00000000BAFDE000 000042 (v01 PTL    COMBUF   00000001 PTL  00000001)
[    0.000000] ACPI: POAT 0x00000000BAFDD000 000055 (v03 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: SSDT 0x00000000BAFDC000 000BF3 (v01 PmRef  Cpu0Ist  00003000 INTL 20061109)
[    0.000000] ACPI: SSDT 0x00000000BAFDB000 000A83 (v01 PmRef  CpuPm    00003000 INTL 20061109)
[    0.000000] ACPI: UEFI 0x00000000BAFDA000 0002A6 (v01 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: DBG2 0x00000000BAFD9000 0000E9 (v00 LENOVO TP-G7    00002540 PTL  00000002)
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at [mem 0x0000000000000000-0x000000013e5fffff]
[    0.000000] Initmem setup node 0 [mem 0x00000000-0x13e5fffff]
[    0.000000]   NODE_DATA [mem 0x13e5ea000-0x13e5fdfff]
[    0.000000]  [ffffea0000000000-ffffea0004ffffff] PMD -> [ffff88013a000000-ffff88013dbfffff] on node 0
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
[    0.000000]   DMA32    [mem 0x01000000-0xffffffff]
[    0.000000]   Normal   [mem 0x100000000-0x13e5fffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x00001000-0x0009cfff]
[    0.000000]   node   0: [mem 0x00100000-0x1fffffff]
[    0.000000]   node   0: [mem 0x20200000-0x40003fff]
[    0.000000]   node   0: [mem 0x40005000-0xaed2ffff]
[    0.000000]   node   0: [mem 0x100000000-0x13e5fffff]
[    0.000000] On node 0 totalpages: 970955
[    0.000000]   DMA zone: 64 pages used for memmap
[    0.000000]   DMA zone: 21 pages reserved
[    0.000000]   DMA zone: 3996 pages, LIFO batch:0
[    0.000000]   DMA32 zone: 11117 pages used for memmap
[    0.000000]   DMA32 zone: 711471 pages, LIFO batch:31
[    0.000000]   Normal zone: 3992 pages used for memmap
[    0.000000]   Normal zone: 255488 pages, LIFO batch:31
[    0.000000] Reserving Intel graphics stolen memory at 0xbba00000-0xbf9fffff
[    0.000000] ACPI: PM-Timer IO Port: 0x408
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0x00] disabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x06] lapic_id[0x00] disabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x07] lapic_id[0x00] disabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x08] lapic_id[0x00] disabled)
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
[    0.000000] ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
[    0.000000] IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.000000] ACPI: IRQ0 used by override.
[    0.000000] ACPI: IRQ2 used by override.
[    0.000000] ACPI: IRQ9 used by override.
[    0.000000] Using ACPI (MADT) for SMP configuration information
[    0.000000] ACPI: HPET id: 0x8086a301 base: 0xfed00000
[    0.000000] smpboot: Allowing 8 CPUs, 4 hotplug CPUs
[    0.000000] nr_irqs_gsi: 40
[    0.000000] PM: Registered nosave memory: [mem 0x0009d000-0x0009dfff]
[    0.000000] PM: Registered nosave memory: [mem 0x0009e000-0x0009ffff]
[    0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000dffff]
[    0.000000] PM: Registered nosave memory: [mem 0x000e0000-0x000fffff]
[    0.000000] PM: Registered nosave memory: [mem 0x20000000-0x201fffff]
[    0.000000] PM: Registered nosave memory: [mem 0x40004000-0x40004fff]
[    0.000000] PM: Registered nosave memory: [mem 0xaed30000-0xbae9efff]
[    0.000000] PM: Registered nosave memory: [mem 0xbae9f000-0xbaf9efff]
[    0.000000] PM: Registered nosave memory: [mem 0xbaf9f000-0xbaffefff]
[    0.000000] PM: Registered nosave memory: [mem 0xbafff000-0xbf9fffff]
[    0.000000] PM: Registered nosave memory: [mem 0xbfa00000-0xf7ffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xf8000000-0xfbffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfc000000-0xfebfffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfec00000-0xfec00fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfec01000-0xfed07fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed08000-0xfed08fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed09000-0xfed0ffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed10000-0xfed19fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed1a000-0xfed1bfff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed1c000-0xfed1ffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed20000-0xfedfffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfee00000-0xfee00fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfee01000-0xffbfffff]
[    0.000000] PM: Registered nosave memory: [mem 0xffc00000-0xffffffff]
[    0.000000] e820: [mem 0xbfa00000-0xf7ffffff] available for PCI devices
[    0.000000] Booting paravirtualized kernel on bare hardware
[    0.000000] setup_percpu: NR_CPUS:1024 nr_cpumask_bits:8 nr_cpu_ids:8 nr_node_ids:1
[    0.000000] PERCPU: Embedded 29 pages/cpu @ffff88013e200000 s88128 r8192 d22464 u262144
[    0.000000] pcpu-alloc: s88128 r8192 d22464 u262144 alloc=1*2097152
[    0.000000] pcpu-alloc: [0] 0 1 2 3 4 5 6 7 
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total pages: 955761
[    0.000000] Policy zone: Normal
[    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-3.15.0-0.rc1.git0.1.fc21.x86_64 root=/dev/mapper/luks-88d41cc3-dbf6-42da-be04-55c0b18fc495 ro rd.luks.uuid=luks-a022e7c3-2439-4570-a0a0-f2bc1ed10c93 rd.luks.uuid=luks-88d41cc3-dbf6-42da-be04-55c0b18fc495 biosdevname=0 vconsole.font=latarcyrheb-sun16 rdshell consoleblank=0 console=ttyUSB0,115200 console=tty0 pause_on_oops=30 SYSFONT=default8x9 LANG=en_US.UTF-8
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] xsave: enabled xstate_bv 0x7, cntxt size 0x340
[    0.000000] Memory: 3719672K/3883820K available (7250K kernel code, 1171K rwdata, 3080K rodata, 1440K init, 1652K bss, 164148K reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=8, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000] 	RCU restricting CPUs from NR_CPUS=1024 to nr_cpu_ids=8.
[    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=8
[    0.000000] NR_IRQS:65792 nr_irqs:744 16
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [tty0] enabled
[    0.000000] allocated 15728640 bytes of page_cgroup
[    0.000000] please try 'cgroup_disable=memory' option if you don't want memory cgroups
[    0.000000] hpet clockevent registered
[    0.000000] tsc: Fast TSC calibration using PIT
[    0.000000] tsc: Detected 2893.501 MHz processor
[    0.000031] Calibrating delay loop (skipped), value calculated using timer frequency.. 5787.00 BogoMIPS (lpj=2893501)
[    0.000173] pid_max: default: 32768 minimum: 301
[    0.000252] ACPI: Core revision 20140214
[    0.009974] ACPI: All ACPI Tables successfully acquired
[    0.011481] Security Framework initialized
[    0.011561] SELinux:  Initializing.
[    0.011638] SELinux:  Starting in permissive mode
[    0.011911] Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes)
[    0.012895] Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes)
[    0.013358] Mount-cache hash table entries: 8192 (order: 4, 65536 bytes)
[    0.013442] Mountpoint-cache hash table entries: 8192 (order: 4, 65536 bytes)
[    0.013685] Initializing cgroup subsys memory
[    0.013764] Initializing cgroup subsys devices
[    0.013838] Initializing cgroup subsys freezer
[    0.013922] Initializing cgroup subsys net_cls
[    0.013995] Initializing cgroup subsys blkio
[    0.014068] Initializing cgroup subsys perf_event
[    0.014142] Initializing cgroup subsys net_prio
[    0.014215] Initializing cgroup subsys hugetlb
[    0.014308] CPU: Physical Processor ID: 0
[    0.014384] CPU: Processor Core ID: 0
[    0.014887] ENERGY_PERF_BIAS: Set to 'normal', was 'performance'
ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8)
[    0.015304] mce: CPU supports 7 MCE banks
[    0.015387] CPU0: Thermal monitoring enabled (TM1)
[    0.015466] Last level iTLB entries: 4KB 512, 2MB 8, 4MB 8
Last level dTLB entries: 4KB 512, 2MB 32, 4MB 32, 1GB 0
tlb_flushall_shift: 2
[    0.015687] Freeing SMP alternatives memory: 24K (ffffffff81e8e000 - ffffffff81e94000)
[    0.016746] ftrace: allocating 26542 entries in 104 pages
[    0.028127] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.038227] smpboot: CPU0: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz (fam: 06, model: 3a, stepping: 09)
[    0.038508] TSC deadline timer enabled
[    0.038516] Performance Events: PEBS fmt1+, 16-deep LBR, IvyBridge events, full-width counters, Intel PMU driver.
[    0.038878] ... version:                3
[    0.038971] ... bit width:              48
[    0.039063] ... generic registers:      4
[    0.039156] ... value mask:             0000ffffffffffff
[    0.039250] ... max period:             0000ffffffffffff
[    0.039345] ... fixed-purpose events:   3
[    0.039438] ... event mask:             000000070000000f
[    0.040584] x86: Booting SMP configuration:
[    0.040682] .... node  #0, CPUs:      #1
[    0.054314] NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter.
[    0.054612]  #2 #3
[    0.081854] x86: Booted up 1 node, 4 CPUs
[    0.082041] smpboot: Total of 4 processors activated (23148.00 BogoMIPS)
[    0.085501] devtmpfs: initialized
[    0.087592] PM: Registering ACPI NVS region [mem 0xbae9f000-0xbaf9efff] (1048576 bytes)
[    0.088390] atomic64 test passed for x86-64 platform with CX8 and with SSE
[    0.088492] pinctrl core: initialized pinctrl subsystem
[    0.088623] RTC time: 20:12:16, date: 04/16/14
[    0.088749] NET: Registered protocol family 16
[    0.088939] cpuidle: using governor menu
[    0.089092] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it
[    0.089235] ACPI: bus type PCI registered
[    0.089332] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
[    0.089599] PCI: MMCONFIG for domain 0000 [bus 00-3f] at [mem 0xf8000000-0xfbffffff] (base 0xf8000000)
[    0.089745] PCI: MMCONFIG at [mem 0xf8000000-0xfbffffff] reserved in E820
[    0.094009] PCI: Using configuration type 1 for base access
[    0.095213] ACPI: Added _OSI(Module Device)
[    0.095310] ACPI: Added _OSI(Processor Device)
[    0.095405] ACPI: Added _OSI(3.0 _SCP Extensions)
[    0.095499] ACPI: Added _OSI(Processor Aggregator Device)
[    0.096762] ACPI : EC: EC description table is found, configuring boot EC
[    0.100379] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
[    0.112972] ACPI: SSDT 0x00000000BAE3A018 000A01 (v01 PmRef  Cpu0Cst  00003001 INTL 20061109)
[    0.113495] ACPI: Dynamic OEM Table Load:
[    0.113675] ACPI: SSDT 0x0000000000000000 000A01 (v01 PmRef  Cpu0Cst  00003001 INTL 20061109)
[    0.116584] ACPI: SSDT 0x00000000BAE3BA98 000303 (v01 PmRef  ApIst    00003000 INTL 20061109)
[    0.117148] ACPI: Dynamic OEM Table Load:
[    0.117327] ACPI: SSDT 0x0000000000000000 000303 (v01 PmRef  ApIst    00003000 INTL 20061109)
[    0.120582] ACPI: SSDT 0x00000000BAE39D98 000119 (v01 PmRef  ApCst    00003000 INTL 20061109)
[    0.121102] ACPI: Dynamic OEM Table Load:
[    0.121283] ACPI: SSDT 0x0000000000000000 000119 (v01 PmRef  ApCst    00003000 INTL 20061109)
[    0.125008] ACPI: Interpreter enabled
[    0.125107] ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S1_] (20140214/hwxface-580)
[    0.125340] ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S2_] (20140214/hwxface-580)
[    0.125582] ACPI: (supports S0 S3 S4 S5)
[    0.125679] ACPI: Using IOAPIC for interrupt routing
[    0.125789] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
[    0.130940] ACPI: Power Resource [PUBS] (on)
[    0.131654] acpi PNP0C0A:01: ACPI dock station (docks/bays count: 1)
[    0.132613] acpi LNXIOBAY:00: ACPI dock station (docks/bays count: 2)
[    0.135020] ACPI: \_PR_.CPU4: failed to get CPU APIC ID.
[    0.135023] ACPI: \_PR_.CPU5: failed to get CPU APIC ID.
[    0.135026] ACPI: \_PR_.CPU6: failed to get CPU APIC ID.
[    0.135028] ACPI: \_PR_.CPU7: failed to get CPU APIC ID.
[    0.135089] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 9 10 *11)
[    0.135671] ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 9 *10 11)
[    0.136246] ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 *7 9 10 11)
[    0.136825] ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 9 10 *11)
[    0.137400] ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 7 9 10 *11)
[    0.137977] ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 *7 9 10 11)
[    0.138551] ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 7 9 *10 11)
[    0.139126] ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 7 9 *10 11)
[    0.139667] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-3f])
[    0.139767] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
[    0.139993] acpi PNP0A08:00: _OSC: platform does not support [PCIeCapability]
[    0.140131] acpi PNP0A08:00: _OSC: not requesting control; platform does not support [PCIeCapability]
[    0.140277] acpi PNP0A08:00: _OSC: OS requested [PCIeHotplug PME AER PCIeCapability]
[    0.140419] acpi PNP0A08:00: _OSC: platform willing to grant [PCIeHotplug PME AER]
[    0.140560] acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM
[    0.140798] PCI host bridge to bus 0000:00
[    0.140892] pci_bus 0000:00: root bus resource [bus 00-3f]
[    0.140988] pci_bus 0000:00: root bus resource [io  0x0000-0x0cf7]
[    0.141084] pci_bus 0000:00: root bus resource [io  0x0d00-0xffff]
[    0.141179] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff]
[    0.141276] pci_bus 0000:00: root bus resource [mem 0xbfa00000-0xfebfffff]
[    0.141374] pci_bus 0000:00: root bus resource [mem 0xfed40000-0xfed4bfff]
[    0.141476] pci 0000:00:00.0: [8086:0154] type 00 class 0x060000
[    0.141541] pci 0000:00:01.0: [8086:0151] type 01 class 0x060400
[    0.141568] pci 0000:00:01.0: PME# supported from D0 D3hot D3cold
[    0.141622] pci 0000:00:02.0: [8086:0166] type 00 class 0x030000
[    0.141631] pci 0000:00:02.0: reg 0x10: [mem 0xf1000000-0xf13fffff 64bit]
[    0.141637] pci 0000:00:02.0: reg 0x18: [mem 0xe0000000-0xefffffff 64bit pref]
[    0.141641] pci 0000:00:02.0: reg 0x20: [io  0x6000-0x603f]
[    0.141721] pci 0000:00:14.0: [8086:1e31] type 00 class 0x0c0330
[    0.141742] pci 0000:00:14.0: reg 0x10: [mem 0xf3520000-0xf352ffff 64bit]
[    0.141812] pci 0000:00:14.0: PME# supported from D3hot D3cold
[    0.141838] pci 0000:00:14.0: System wakeup disabled by ACPI
[    0.141971] pci 0000:00:16.0: [8086:1e3a] type 00 class 0x078000
[    0.141993] pci 0000:00:16.0: reg 0x10: [mem 0xf3535000-0xf353500f 64bit]
[    0.142066] pci 0000:00:16.0: PME# supported from D0 D3hot D3cold
[    0.142130] pci 0000:00:19.0: [8086:1502] type 00 class 0x020000
[    0.142147] pci 0000:00:19.0: reg 0x10: [mem 0xf3500000-0xf351ffff]
[    0.142155] pci 0000:00:19.0: reg 0x14: [mem 0xf353b000-0xf353bfff]
[    0.142163] pci 0000:00:19.0: reg 0x18: [io  0x6080-0x609f]
[    0.142223] pci 0000:00:19.0: PME# supported from D0 D3hot D3cold
[    0.142249] pci 0000:00:19.0: System wakeup disabled by ACPI
[    0.142378] pci 0000:00:1a.0: [8086:1e2d] type 00 class 0x0c0320
[    0.142398] pci 0000:00:1a.0: reg 0x10: [mem 0xf353a000-0xf353a3ff]
[    0.142484] pci 0000:00:1a.0: PME# supported from D0 D3hot D3cold
[    0.142512] pci 0000:00:1a.0: System wakeup disabled by ACPI
[    0.142643] pci 0000:00:1b.0: [8086:1e20] type 00 class 0x040300
[    0.142657] pci 0000:00:1b.0: reg 0x10: [mem 0xf3530000-0xf3533fff 64bit]
[    0.142728] pci 0000:00:1b.0: PME# supported from D0 D3hot D3cold
[    0.142759] pci 0000:00:1b.0: System wakeup disabled by ACPI
[    0.142894] pci 0000:00:1c.0: [8086:1e10] type 01 class 0x060400
[    0.143027] pci 0000:00:1c.0: PME# supported from D0 D3hot D3cold
[    0.143101] pci 0000:00:1c.1: [8086:1e12] type 01 class 0x060400
[    0.143235] pci 0000:00:1c.1: PME# supported from D0 D3hot D3cold
[    0.143305] pci 0000:00:1c.2: [8086:1e14] type 01 class 0x060400
[    0.143437] pci 0000:00:1c.2: PME# supported from D0 D3hot D3cold
[    0.143476] pci 0000:00:1c.2: System wakeup disabled by ACPI
[    0.143610] pci 0000:00:1d.0: [8086:1e26] type 00 class 0x0c0320
[    0.143630] pci 0000:00:1d.0: reg 0x10: [mem 0xf3539000-0xf35393ff]
[    0.143716] pci 0000:00:1d.0: PME# supported from D0 D3hot D3cold
[    0.143745] pci 0000:00:1d.0: System wakeup disabled by ACPI
[    0.143879] pci 0000:00:1f.0: [8086:1e55] type 00 class 0x060100
[    0.144030] pci 0000:00:1f.2: [8086:1e03] type 00 class 0x010601
[    0.144047] pci 0000:00:1f.2: reg 0x10: [io  0x60a8-0x60af]
[    0.144054] pci 0000:00:1f.2: reg 0x14: [io  0x60b4-0x60b7]
[    0.144062] pci 0000:00:1f.2: reg 0x18: [io  0x60a0-0x60a7]
[    0.144070] pci 0000:00:1f.2: reg 0x1c: [io  0x60b0-0x60b3]
[    0.144077] pci 0000:00:1f.2: reg 0x20: [io  0x6060-0x607f]
[    0.144084] pci 0000:00:1f.2: reg 0x24: [mem 0xf3538000-0xf35387ff]
[    0.144127] pci 0000:00:1f.2: PME# supported from D3hot
[    0.144179] pci 0000:00:1f.3: [8086:1e22] type 00 class 0x0c0500
[    0.144194] pci 0000:00:1f.3: reg 0x10: [mem 0xf3534000-0xf35340ff 64bit]
[    0.144213] pci 0000:00:1f.3: reg 0x20: [io  0xefa0-0xefbf]
[    0.144318] pci 0000:01:00.0: [10de:1140] type 00 class 0x030200
[    0.144327] pci 0000:01:00.0: reg 0x10: [mem 0xf0000000-0xf0ffffff]
[    0.144336] pci 0000:01:00.0: reg 0x14: [mem 0xc0000000-0xcfffffff 64bit pref]
[    0.144345] pci 0000:01:00.0: reg 0x1c: [mem 0xd0000000-0xd1ffffff 64bit pref]
[    0.144352] pci 0000:01:00.0: reg 0x24: [io  0x5000-0x507f]
[    0.144359] pci 0000:01:00.0: reg 0x30: [mem 0xfff80000-0xffffffff pref]
[    0.145884] pci 0000:00:01.0: PCI bridge to [bus 01]
[    0.146003] pci 0000:00:01.0:   bridge window [io  0x5000-0x5fff]
[    0.146005] pci 0000:00:01.0:   bridge window [mem 0xf0000000-0xf0ffffff]
[    0.146008] pci 0000:00:01.0:   bridge window [mem 0xc0000000-0xd1ffffff 64bit pref]
[    0.146098] pci 0000:00:1c.0: PCI bridge to [bus 02]
[    0.146196] pci 0000:00:1c.0:   bridge window [io  0x4000-0x4fff]
[    0.146200] pci 0000:00:1c.0:   bridge window [mem 0xf2d00000-0xf34fffff]
[    0.146209] pci 0000:00:1c.0:   bridge window [mem 0xf1400000-0xf1bfffff 64bit pref]
[    0.146435] pci 0000:03:00.0: [8086:4238] type 00 class 0x028000
[    0.146583] pci 0000:03:00.0: reg 0x10: [mem 0xf2c00000-0xf2c01fff 64bit]
[    0.147354] pci 0000:03:00.0: PME# supported from D0 D3hot D3cold
[    0.149006] pci 0000:00:1c.1: PCI bridge to [bus 03]
[    0.149109] pci 0000:00:1c.1:   bridge window [mem 0xf2c00000-0xf2cfffff]
[    0.149211] acpiphp: Slot [1] registered
[    0.149470] pci 0000:04:00.0: [1180:e822] type 00 class 0x088000
[    0.149489] pci 0000:04:00.0: MMC controller base frequency changed to 50Mhz.
[    0.149772] pci 0000:04:00.0: reg 0x10: [mem 0xf2400000-0xf24000ff]
[    0.149995] pci 0000:04:00.0: supports D1 D2
[    0.149996] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold
[    0.152073] pci 0000:00:1c.2: PCI bridge to [bus 04-0b]
[    0.152171] pci 0000:00:1c.2:   bridge window [io  0x3000-0x3fff]
[    0.152175] pci 0000:00:1c.2:   bridge window [mem 0xf2400000-0xf2bfffff]
[    0.152184] pci 0000:00:1c.2:   bridge window [mem 0xf1c00000-0xf23fffff 64bit pref]
[    0.152847] ACPI: Enabled 5 GPEs in block 00 to 3F
[    0.153071] ACPI : EC: GPE = 0x11, I/O: command/status = 0x66, data = 0x62
[    0.153240] vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
[    0.153386] vgaarb: loaded
[    0.153478] vgaarb: bridge control possible 0000:00:02.0
[    0.153622] SCSI subsystem initialized
[    0.153745] libata version 3.00 loaded.
[    0.153764] ACPI: bus type USB registered
[    0.153874] usbcore: registered new interface driver usbfs
[    0.153977] usbcore: registered new interface driver hub
[    0.154107] usbcore: registered new device driver usb
[    0.154251] PCI: Using ACPI for IRQ routing
[    0.156285] PCI: pci_cache_line_size set to 64 bytes
[    0.156772] e820: reserve RAM buffer [mem 0x0009d800-0x0009ffff]
[    0.156773] e820: reserve RAM buffer [mem 0x40004000-0x43ffffff]
[    0.156774] e820: reserve RAM buffer [mem 0xaed30000-0xafffffff]
[    0.156775] e820: reserve RAM buffer [mem 0x13e600000-0x13fffffff]
[    0.156846] NetLabel: Initializing
[    0.156940] NetLabel:  domain hash size = 128
[    0.157033] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.157136] NetLabel:  unlabeled traffic allowed by default
[    0.157287] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0, 0, 0, 0, 0, 0
[    0.157761] hpet0: 8 comparators, 64-bit 14.318180 MHz counter
[    0.159882] Switched to clocksource hpet
[    0.160003] Could not create debugfs 'set_ftrace_filter' entry
[    0.160103] Could not create debugfs 'set_ftrace_notrace' entry
[    0.164865] pnp: PnP ACPI init
[    0.164981] ACPI: bus type PNP registered
[    0.165392] system 00:00: [mem 0x00000000-0x0009ffff] could not be reserved
[    0.165494] system 00:00: [mem 0x000c0000-0x000c3fff] could not be reserved
[    0.165592] system 00:00: [mem 0x000c4000-0x000c7fff] could not be reserved
[    0.165690] system 00:00: [mem 0x000c8000-0x000cbfff] has been reserved
[    0.165787] system 00:00: [mem 0x000cc000-0x000cffff] has been reserved
[    0.165891] system 00:00: [mem 0x000d0000-0x000d3fff] has been reserved
[    0.165988] system 00:00: [mem 0x000d4000-0x000d7fff] has been reserved
[    0.166086] system 00:00: [mem 0x000d8000-0x000dbfff] has been reserved
[    0.166183] system 00:00: [mem 0x000dc000-0x000dffff] has been reserved
[    0.166280] system 00:00: [mem 0x000e0000-0x000e3fff] could not be reserved
[    0.166377] system 00:00: [mem 0x000e4000-0x000e7fff] could not be reserved
[    0.166474] system 00:00: [mem 0x000e8000-0x000ebfff] could not be reserved
[    0.166572] system 00:00: [mem 0x000ec000-0x000effff] could not be reserved
[    0.166669] system 00:00: [mem 0x000f0000-0x000fffff] could not be reserved
[    0.166768] system 00:00: [mem 0x00100000-0xbf9fffff] could not be reserved
[    0.166865] system 00:00: [mem 0xfec00000-0xfed3ffff] could not be reserved
[    0.166968] system 00:00: [mem 0xfed4c000-0xffffffff] could not be reserved
[    0.167067] system 00:00: Plug and Play ACPI device, IDs PNP0c01 (active)
[    0.167135] pnp 00:01: disabling [mem 0xfffff000-0xffffffff] because it overlaps 0000:01:00.0 BAR 6 [mem 0xfff80000-0xffffffff pref]
[    0.167308] system 00:01: [io  0x0400-0x047f] could not be reserved
[    0.167407] system 00:01: [io  0x0500-0x057f] has been reserved
[    0.167503] system 00:01: [io  0x0800-0x080f] has been reserved
[    0.167599] system 00:01: [io  0x15e0-0x15ef] has been reserved
[    0.167696] system 00:01: [io  0x1600-0x167f] has been reserved
[    0.167793] system 00:01: [mem 0xf8000000-0xfbffffff] has been reserved
[    0.167896] system 00:01: [mem 0xfed1c000-0xfed1ffff] has been reserved
[    0.167995] system 00:01: [mem 0xfed10000-0xfed13fff] has been reserved
[    0.168091] system 00:01: [mem 0xfed18000-0xfed18fff] has been reserved
[    0.168189] system 00:01: [mem 0xfed19000-0xfed19fff] has been reserved
[    0.168286] system 00:01: [mem 0xfed45000-0xfed4bfff] has been reserved
[    0.168383] system 00:01: Plug and Play ACPI device, IDs PNP0c02 (active)
[    0.168428] pnp 00:02: Plug and Play ACPI device, IDs PNP0103 (active)
[    0.168434] pnp 00:03: [dma 4]
[    0.168449] pnp 00:03: Plug and Play ACPI device, IDs PNP0200 (active)
[    0.168465] pnp 00:04: Plug and Play ACPI device, IDs PNP0800 (active)
[    0.168494] pnp 00:05: Plug and Play ACPI device, IDs PNP0c04 (active)
[    0.168517] pnp 00:06: Plug and Play ACPI device, IDs PNP0b00 (active)
[    0.168542] pnp 00:07: Plug and Play ACPI device, IDs LEN0071 PNP0303 (active)
[    0.168564] pnp 00:08: Plug and Play ACPI device, IDs LEN0015 PNP0f13 (active)
[    0.168601] pnp 00:09: Plug and Play ACPI device, IDs SMO1200 PNP0c31 (active)
[    0.169023] pnp: PnP ACPI: found 10 devices
[    0.169120] ACPI: bus type PNP unregistered
[    0.175617] pci 0000:01:00.0: can't claim BAR 6 [mem 0xfff80000-0xffffffff pref]: no compatible bridge window
[    0.175807] pci 0000:01:00.0: BAR 6: can't assign mem pref (size 0x80000)
[    0.175909] pci 0000:00:01.0: PCI bridge to [bus 01]
[    0.176004] pci 0000:00:01.0:   bridge window [io  0x5000-0x5fff]
[    0.176101] pci 0000:00:01.0:   bridge window [mem 0xf0000000-0xf0ffffff]
[    0.176199] pci 0000:00:01.0:   bridge window [mem 0xc0000000-0xd1ffffff 64bit pref]
[    0.176342] pci 0000:00:1c.0: PCI bridge to [bus 02]
[    0.177646] pci 0000:00:1c.0:   bridge window [io  0x4000-0x4fff]
[    0.177747] pci 0000:00:1c.0:   bridge window [mem 0xf2d00000-0xf34fffff]
[    0.177847] pci 0000:00:1c.0:   bridge window [mem 0xf1400000-0xf1bfffff 64bit pref]
[    0.177998] pci 0000:00:1c.1: PCI bridge to [bus 03]
[    0.178097] pci 0000:00:1c.1:   bridge window [mem 0xf2c00000-0xf2cfffff]
[    0.178205] pci 0000:00:1c.2: PCI bridge to [bus 04-0b]
[    0.178303] pci 0000:00:1c.2:   bridge window [io  0x3000-0x3fff]
[    0.178404] pci 0000:00:1c.2:   bridge window [mem 0xf2400000-0xf2bfffff]
[    0.178505] pci 0000:00:1c.2:   bridge window [mem 0xf1c00000-0xf23fffff 64bit pref]
[    0.178654] pci_bus 0000:00: resource 4 [io  0x0000-0x0cf7]
[    0.178655] pci_bus 0000:00: resource 5 [io  0x0d00-0xffff]
[    0.178656] pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff]
[    0.178658] pci_bus 0000:00: resource 7 [mem 0xbfa00000-0xfebfffff]
[    0.178659] pci_bus 0000:00: resource 8 [mem 0xfed40000-0xfed4bfff]
[    0.178660] pci_bus 0000:01: resource 0 [io  0x5000-0x5fff]
[    0.178661] pci_bus 0000:01: resource 1 [mem 0xf0000000-0xf0ffffff]
[    0.178663] pci_bus 0000:01: resource 2 [mem 0xc0000000-0xd1ffffff 64bit pref]
[    0.178664] pci_bus 0000:02: resource 0 [io  0x4000-0x4fff]
[    0.178665] pci_bus 0000:02: resource 1 [mem 0xf2d00000-0xf34fffff]
[    0.178667] pci_bus 0000:02: resource 2 [mem 0xf1400000-0xf1bfffff 64bit pref]
[    0.178668] pci_bus 0000:03: resource 1 [mem 0xf2c00000-0xf2cfffff]
[    0.178669] pci_bus 0000:04: resource 0 [io  0x3000-0x3fff]
[    0.178671] pci_bus 0000:04: resource 1 [mem 0xf2400000-0xf2bfffff]
[    0.178672] pci_bus 0000:04: resource 2 [mem 0xf1c00000-0xf23fffff 64bit pref]
[    0.178693] NET: Registered protocol family 2
[    0.178928] TCP established hash table entries: 32768 (order: 6, 262144 bytes)
[    0.179141] TCP bind hash table entries: 32768 (order: 7, 524288 bytes)
[    0.179328] TCP: Hash tables configured (established 32768 bind 32768)
[    0.179442] TCP: reno registered
[    0.179545] UDP hash table entries: 2048 (order: 4, 65536 bytes)
[    0.179659] UDP-Lite hash table entries: 2048 (order: 4, 65536 bytes)
[    0.179803] NET: Registered protocol family 1
[    0.179914] pci 0000:00:02.0: Boot video device
[    0.180445] PCI: CLS 64 bytes, default 64
[    0.180480] Unpacking initramfs...
[    0.419917] Freeing initrd memory: 18692K (ffff880035b6f000 - ffff880036db0000)
[    0.420092] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
[    0.420193] software IO TLB [mem 0xaad30000-0xaed30000] (64MB) mapped at [ffff8800aad30000-ffff8800aed2ffff]
[    0.420565] resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
[    0.420713] ------------[ cut here ]------------
[    0.420810] WARNING: CPU: 0 PID: 1 at arch/x86/mm/ioremap.c:171 __ioremap_caller+0x2dd/0x380()
[    0.420962] Info: mapping multiple BARs. Your kernel is fine.
[    0.421012] Modules linked in:
[    0.421235] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.15.0-0.rc1.git0.1.fc21.x86_64 #1
[    0.421377] Hardware name: LENOVO 2356JK8/2356JK8, BIOS G7ET94WW (2.54 ) 04/30/2013
[    0.421518]  0000000000000000 00000000294ea4b4 ffff8801385f9b08 ffffffff8170077e
[    0.421829]  ffff8801385f9b50 ffff8801385f9b40 ffffffff81089f6d ffffc90000670000
[    0.422142]  ffff8800a874e200 ffffc90000670000 ffffc90000670000 0000000000006000
[    0.422450] Call Trace:
[    0.422545]  [<ffffffff8170077e>] dump_stack+0x45/0x56
[    0.422642]  [<ffffffff81089f6d>] warn_slowpath_common+0x7d/0xa0
[    0.422738]  [<ffffffff81089fec>] warn_slowpath_fmt+0x5c/0x80
[    0.422834]  [<ffffffff810911d8>] ? iomem_map_sanity_check+0xc8/0xd0
[    0.422932]  [<ffffffff8105786d>] __ioremap_caller+0x2dd/0x380
[    0.423042]  [<ffffffff81057927>] ioremap_nocache+0x17/0x20
[    0.423138]  [<ffffffff81033d0c>] snb_uncore_imc_init_box+0x7c/0xc0
[    0.423235]  [<ffffffff81036da5>] uncore_pci_probe+0xd5/0x1b0
[    0.423334]  [<ffffffff8139c915>] local_pci_probe+0x45/0xa0
[    0.423430]  [<ffffffff8139dca9>] pci_device_probe+0xf9/0x150
[    0.423527]  [<ffffffff8146d39c>] driver_probe_device+0x9c/0x3d0
[    0.423625]  [<ffffffff8146d79b>] __driver_attach+0x8b/0x90
[    0.423722]  [<ffffffff8146d710>] ? __device_attach+0x40/0x40
[    0.423818]  [<ffffffff8146b0c3>] bus_for_each_dev+0x73/0xc0
[    0.423915]  [<ffffffff8146cdee>] driver_attach+0x1e/0x20
[    0.424038]  [<ffffffff8146c990>] bus_add_driver+0x180/0x250
[    0.424137]  [<ffffffff81d4990d>] ? uncore_types_init+0x1a7/0x1a7
[    0.424234]  [<ffffffff8146de44>] driver_register+0x64/0xf0
[    0.424330]  [<ffffffff81d4990d>] ? uncore_types_init+0x1a7/0x1a7
[    0.424427]  [<ffffffff8139c1cc>] __pci_register_driver+0x4c/0x50
[    0.424524]  [<ffffffff81d49a81>] intel_uncore_init+0x174/0x416
[    0.424622]  [<ffffffff81d4990d>] ? uncore_types_init+0x1a7/0x1a7
[    0.424719]  [<ffffffff81002162>] do_one_initcall+0xf2/0x1b0
[    0.424816]  [<ffffffff810abd1d>] ? parse_args+0x21d/0x4d0
[    0.424913]  [<ffffffff81d3d087>] kernel_init_freeable+0x1b8/0x254
[    0.425018]  [<ffffffff816f48e0>] ? rest_init+0x80/0x80
[    0.425114]  [<ffffffff816f48ee>] kernel_init+0xe/0xf0
[    0.425211]  [<ffffffff8171043c>] ret_from_fork+0x7c/0xb0
[    0.425306]  [<ffffffff816f48e0>] ? rest_init+0x80/0x80
[    0.425405] ---[ end trace 6765dd4a297528d0 ]---

Re: Info: mapping multiple BARs. Your kernel is fine.

[Borislav Petkov]

Hi Bjorn,

thanks for the patch, a couple of notes below:

On Wed, Apr 16, 2014 at 04:56:00PM -0600, Bjorn Helgaas wrote:
> PNP: Work around Haswell BIOS defect in MCH area reporting
> 
> From: Bjorn Helgaas <bhelgaas@google.com>
> 
> Work around a Haswell BIOS defect that causes part of the MCH area to be
> unreported.

Yep, what Stephane said, this is not HSW only.

> MCHBAR is not an architected PCI BAR, so MCH space is usually reported as a
> PNP0C02 resource.  The MCH space was 16KB prior to Haswell, but it is 32KB
> in Haswell.  Some Haswell BIOSes still report a PNP0C02 resource that is
> only 16KB, which means the rest of the MCH space is consumed but
> unreported.
> 
> This can cause resource map sanity check warnings or (theoretically) a
> device conflict if we assigned the unreported space to another device.
> 
> The Intel perf event uncore driver tripped over this when it claimed the
> MCH region:
> 
>   resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
>   Info: mapping multiple BARs. Your kernel is fine.
> 
> To prevent this, if we find a PNP0C02 resource that covers part of the MCH
> space, extend it to cover the entire space.
> 
> Link: http://lkml.kernel.org/r/20140224162400.GE16457@pd.tnic
> Reported-by: Borislav Petkov <bp@alien8.de>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> ---
>  drivers/pnp/quirks.c |   55 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
> 
> diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
> index 258fef272ea7..8402088d4145 100644
> --- a/drivers/pnp/quirks.c
> +++ b/drivers/pnp/quirks.c
> @@ -334,6 +334,60 @@ static void quirk_amd_mmconfig_area(struct pnp_dev *dev)
>  }
>  #endif
>  
> +static void quirk_intel_haswell_mch(struct pnp_dev *dev)
> +{
> +	struct pci_dev *host;
> +	u32 addr_lo, addr_hi;
> +	struct pci_bus_region region;
> +	struct resource mch;
> +	struct pnp_resource *pnp_res;
> +	struct resource *res;
> +
> +	host = pci_get_device(PCI_VENDOR_ID_INTEL, 0x0c00, NULL);

And because it is not HSW only, this PCI device ID doesn't match on my
IVB system. On mine the hostbridge is

00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
        Subsystem: Lenovo Device 21fa
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
        Latency: 0
        Capabilities: <access denied>
        Kernel driver in use: ivb_uncore
00: 86 80 54 01 06 00 90 20 09 00 00 06 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 aa 17 fa 21
30: 00 00 00 00 e0 00 00 00 00 00 00 00 00 00 00 00

and from looking at Dave's, it is the same one, so PCI device ID is
0x154.

With that changed to

	host = pci_get_device(PCI_VENDOR_ID_INTEL, 0x0154, NULL);

and a bit of debugging code, it says now:

[    0.235739] quirk_intel_haswell_mch: entry
[    0.235800] quirk_intel_haswell_mch: got host: 0x0
[    0.235860] quirk_intel_haswell_mch: mch: [mem 0xfed10000-0xfed17fff]
[    0.235930] quirk_intel_haswell_mch: res: [mem 0xfed10000-0xfed13fff]
[    0.235990] pnp 00:01: [Firmware Bug]: [mem 0xfed10000-0xfed13fff] covers only part of Intel Haswell MCH; extending to [mem 0xfed10000-0xfed17fff]

So you probably want to have a list of hostbridge pci ids in the quirk
or so.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

Re: Info: mapping multiple BARs. Your kernel is fine.

[Bjorn Helgaas]

Thanks a lot for testing this out and debugging my issues.

Here's a new version that looks for both device IDs I know about.

I'm still nervous about the modeset problem Dave is seeing.  Since the
original patch wouldn't find an 8086:0c00 device on Dave's system, it
should have done nothing.  But since it caused a modesetting problem,
there's something else doing on that I don't understand.

Bjorn



PNP: Work around BIOS defects in Intel MCH area reporting

From: Bjorn Helgaas <bhelgaas@google.com>

Work around BIOSes that don't report the entire Intel MCH area.

MCHBAR is not an architected PCI BAR, so MCH space is usually reported as a
PNP0C02 resource.  The MCH space was once 16KB, but is 32KB in newer parts.
Some BIOSes still report a PNP0C02 resource that is only 16KB, which means
the rest of the MCH space is consumed but unreported.

This can cause resource map sanity check warnings or (theoretically) a
device conflict if we assigned the unreported space to another device.

The Intel perf event uncore driver tripped over this when it claimed the
MCH region:

  resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
  Info: mapping multiple BARs. Your kernel is fine.

To prevent this, if we find a PNP0C02 resource that covers part of the MCH
space, extend it to cover the entire space.

Link: http://lkml.kernel.org/r/20140224162400.GE16457@pd.tnic
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pnp/quirks.c |   74 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
index 258fef272ea7..403bd5c42ed1 100644
--- a/drivers/pnp/quirks.c
+++ b/drivers/pnp/quirks.c
@@ -334,6 +334,79 @@ static void quirk_amd_mmconfig_area(struct pnp_dev *dev)
 }
 #endif
 
+/* Device IDs of parts that have 32KB MCH space */
+static const unsigned int mch_quirk_devices[] = {
+	0x0154,	/* Ivy Bridge */
+	0x0c00,	/* Haswell */
+};
+
+static struct pci_dev *get_intel_host(void)
+{
+	int i;
+	struct pci_dev *host;
+
+	for (i = 0; i < ARRAY_SIZE(mch_quirk_devices); i++) {
+		host = pci_get_device(PCI_VENDOR_ID_INTEL, mch_quirk_devices[i],
+				      NULL);
+		if (host)
+			return host;
+	}
+	return NULL;
+}
+
+static void quirk_intel_mch(struct pnp_dev *dev)
+{
+	struct pci_dev *host;
+	u32 addr_lo, addr_hi;
+	struct pci_bus_region region;
+	struct resource mch;
+	struct pnp_resource *pnp_res;
+	struct resource *res;
+
+	host = get_intel_host();
+	if (!host)
+		return;
+
+	/*
+	 * MCHBAR is not an architected PCI BAR, so MCH space is usually
+	 * reported as a PNP0C02 resource.  The MCH space was originally
+	 * 16KB, but is 32KB in newer parts.  Some BIOSes still report a
+	 * PNP0C02 resource that is only 16KB, which means the rest of the
+	 * MCH space is consumed but unreported.
+	 */
+
+	/*
+	 * Read MCHBAR for Host Member Mapped Register Range Base
+	 * https://www-ssl.intel.com/content/www/us/en/processors/core/4th-gen-core-family-desktop-vol-2-datasheet
+	 * Sec 3.1.12.
+	 */
+	pci_read_config_dword(host, 0x48, &addr_lo);
+	region.start = addr_lo & ~0x7fff;
+	pci_read_config_dword(host, 0x4c, &addr_hi);
+	region.start |= (dma_addr_t) addr_hi << 32;
+	region.end = region.start + 32*1024 - 1 ;
+
+	memset(&mch, 0, sizeof(mch));
+	mch.flags = IORESOURCE_MEM;
+	pcibios_bus_to_resource(host->bus, &mch, &region);
+
+	list_for_each_entry(pnp_res, &dev->resources, list) {
+		res = &pnp_res->res;
+		if (res->end < mch.start || res->start > mch.end)
+			continue;	/* no overlap */
+		if (res->start == mch.start && res->end == mch.end)
+			continue;	/* exact match */
+
+		dev_info(&dev->dev, FW_BUG "PNP resource %pR covers only part of %s Intel MCH; extending to %pR\n",
+			 res, pci_name(host), &mch);
+		res->start = mch.start;
+		res->end = mch.end;
+		break;
+	}
+
+	pci_dev_put(host);
+}
+
 /*
  *  PnP Quirks
  *  Cards or devices that need some tweaking due to incomplete resource info
@@ -364,6 +437,7 @@ static struct pnp_fixup pnp_fixups[] = {
 #ifdef CONFIG_AMD_NB
 	{"PNP0c01", quirk_amd_mmconfig_area},
 #endif
+	{"PNP0c02", quirk_intel_mch},
 	{""}
 };
 

Re: Info: mapping multiple BARs. Your kernel is fine.

[Borislav Petkov]

On Thu, Apr 17, 2014 at 12:26:37PM -0600, Bjorn Helgaas wrote:
> Thanks a lot for testing this out and debugging my issues.
> 
> Here's a new version that looks for both device IDs I know about.
> 
> I'm still nervous about the modeset problem Dave is seeing.  Since the
> original patch wouldn't find an 8086:0c00 device on Dave's system, it
> should have done nothing.  But since it caused a modesetting problem,
> there's something else doing on that I don't understand.

Yeah, this is strange, to put it mildly. This quirk wouldnt've done
anything besides the iteration over the pci devices with pci_get_device.
Which wouldn't do anything (refcount increment or so) if it didn't find
the device, right?

Bah, today is the day of the strange bugs. :-\

> PNP: Work around BIOS defects in Intel MCH area reporting
> 
> From: Bjorn Helgaas <bhelgaas@google.com>
> 
> Work around BIOSes that don't report the entire Intel MCH area.
> 
> MCHBAR is not an architected PCI BAR, so MCH space is usually reported as a
> PNP0C02 resource.  The MCH space was once 16KB, but is 32KB in newer parts.
> Some BIOSes still report a PNP0C02 resource that is only 16KB, which means
> the rest of the MCH space is consumed but unreported.
> 
> This can cause resource map sanity check warnings or (theoretically) a
> device conflict if we assigned the unreported space to another device.
> 
> The Intel perf event uncore driver tripped over this when it claimed the
> MCH region:
> 
>   resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
>   Info: mapping multiple BARs. Your kernel is fine.
> 
> To prevent this, if we find a PNP0C02 resource that covers part of the MCH
> space, extend it to cover the entire space.
> 
> Link: http://lkml.kernel.org/r/20140224162400.GE16457@pd.tnic
> Reported-by: Borislav Petkov <bp@alien8.de>

Yep, this one works fine:

[    0.403855] pnp 00:01: [Firmware Bug]: PNP resource [mem 0xfed10000-0xfed13fff] covers only part of 0000:00:00.0 Intel MCH; extending to [mem 0xfed10000-0xfed17fff]

Acked-by: Borislav Petkov <bp@suse.de>
Tested-by: Borislav Petkov <bp@suse.de>

Just a minor nitpick below.

> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> ---
>  drivers/pnp/quirks.c |   74 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 74 insertions(+)
> 
> diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
> index 258fef272ea7..403bd5c42ed1 100644
> --- a/drivers/pnp/quirks.c
> +++ b/drivers/pnp/quirks.c
> @@ -334,6 +334,79 @@ static void quirk_amd_mmconfig_area(struct pnp_dev *dev)
>  }
>  #endif
>  
> +/* Device IDs of parts that have 32KB MCH space */
> +static const unsigned int mch_quirk_devices[] = {
> +	0x0154,	/* Ivy Bridge */
> +	0x0c00,	/* Haswell */
> +};
> +
> +static struct pci_dev *get_intel_host(void)
> +{
> +	int i;
> +	struct pci_dev *host;
> +
> +	for (i = 0; i < ARRAY_SIZE(mch_quirk_devices); i++) {
> +		host = pci_get_device(PCI_VENDOR_ID_INTEL, mch_quirk_devices[i],
> +				      NULL);
> +		if (host)
> +			return host;
> +	}
> +	return NULL;
> +}
> +
> +static void quirk_intel_mch(struct pnp_dev *dev)
> +{
> +	struct pci_dev *host;
> +	u32 addr_lo, addr_hi;
> +	struct pci_bus_region region;
> +	struct resource mch;
> +	struct pnp_resource *pnp_res;
> +	struct resource *res;
> +
> +	host = get_intel_host();
> +	if (!host)
> +		return;
> +
> +	/*
> +	 * MCHBAR is not an architected PCI BAR, so MCH space is usually
> +	 * reported as a PNP0C02 resource.  The MCH space was originally
> +	 * 16KB, but is 32KB in newer parts.  Some BIOSes still report a
> +	 * PNP0C02 resource that is only 16KB, which means the rest of the
> +	 * MCH space is consumed but unreported.
> +	 */
> +
> +	/*
> +	 * Read MCHBAR for Host Member Mapped Register Range Base
> +	 * https://www-ssl.intel.com/content/www/us/en/processors/core/4th-gen-core-family-desktop-vol-2-datasheet
> +	 * Sec 3.1.12.
> +	 */
> +	pci_read_config_dword(host, 0x48, &addr_lo);
> +	region.start = addr_lo & ~0x7fff;
> +	pci_read_config_dword(host, 0x4c, &addr_hi);
> +	region.start |= (dma_addr_t) addr_hi << 32;
> +	region.end = region.start + 32*1024 - 1 ;

checkpatch complains about a trailing space before the semicolon.

> +
> +	memset(&mch, 0, sizeof(mch));
> +	mch.flags = IORESOURCE_MEM;
> +	pcibios_bus_to_resource(host->bus, &mch, &region);
> +
> +	list_for_each_entry(pnp_res, &dev->resources, list) {
> +		res = &pnp_res->res;
> +		if (res->end < mch.start || res->start > mch.end)
> +			continue;	/* no overlap */
> +		if (res->start == mch.start && res->end == mch.end)
> +			continue;	/* exact match */
> +
> +		dev_info(&dev->dev, FW_BUG "PNP resource %pR covers only part of %s Intel MCH; extending to %pR\n",
> +			 res, pci_name(host), &mch);
> +		res->start = mch.start;
> +		res->end = mch.end;
> +		break;
> +	}
> +
> +	pci_dev_put(host);
> +}
> +
>  /*
>   *  PnP Quirks
>   *  Cards or devices that need some tweaking due to incomplete resource info
> @@ -364,6 +437,7 @@ static struct pnp_fixup pnp_fixups[] = {
>  #ifdef CONFIG_AMD_NB
>  	{"PNP0c01", quirk_amd_mmconfig_area},
>  #endif
> +	{"PNP0c02", quirk_intel_mch},
>  	{""}
>  };

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

Re: Info: mapping multiple BARs. Your kernel is fine.

[Bjorn Helgaas]

On Thu, Apr 17, 2014 at 1:48 PM, Borislav Petkov <bp@alien8.de> wrote:
> On Thu, Apr 17, 2014 at 12:26:37PM -0600, Bjorn Helgaas wrote:
>> Thanks a lot for testing this out and debugging my issues.
>>
>> Here's a new version that looks for both device IDs I know about.
>>
>> I'm still nervous about the modeset problem Dave is seeing.  Since the
>> original patch wouldn't find an 8086:0c00 device on Dave's system, it
>> should have done nothing.  But since it caused a modesetting problem,
>> there's something else doing on that I don't understand.
>
> Yeah, this is strange, to put it mildly. This quirk wouldnt've done
> anything besides the iteration over the pci devices with pci_get_device.
> Which wouldn't do anything (refcount increment or so) if it didn't find
> the device, right?

Right.

> Bah, today is the day of the strange bugs. :-\
>
>> PNP: Work around BIOS defects in Intel MCH area reporting
>>
>> From: Bjorn Helgaas <bhelgaas@google.com>
>>
>> Work around BIOSes that don't report the entire Intel MCH area.
>>
>> MCHBAR is not an architected PCI BAR, so MCH space is usually reported as a
>> PNP0C02 resource.  The MCH space was once 16KB, but is 32KB in newer parts.
>> Some BIOSes still report a PNP0C02 resource that is only 16KB, which means
>> the rest of the MCH space is consumed but unreported.
>>
>> This can cause resource map sanity check warnings or (theoretically) a
>> device conflict if we assigned the unreported space to another device.
>>
>> The Intel perf event uncore driver tripped over this when it claimed the
>> MCH region:
>>
>>   resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
>>   Info: mapping multiple BARs. Your kernel is fine.
>>
>> To prevent this, if we find a PNP0C02 resource that covers part of the MCH
>> space, extend it to cover the entire space.
>>
>> Link: http://lkml.kernel.org/r/20140224162400.GE16457@pd.tnic
>> Reported-by: Borislav Petkov <bp@alien8.de>
>
> Yep, this one works fine:
>
> [    0.403855] pnp 00:01: [Firmware Bug]: PNP resource [mem 0xfed10000-0xfed13fff] covers only part of 0000:00:00.0 Intel MCH; extending to [mem 0xfed10000-0xfed17fff]
>
> Acked-by: Borislav Petkov <bp@suse.de>
> Tested-by: Borislav Petkov <bp@suse.de>

>> +     region.end = region.start + 32*1024 - 1 ;

> checkpatch complains about a trailing space before the semicolon.

Thanks!  I hate typos like that.

I'll fix this, add your tested-by and ack, and send to Rafael.

Bjorn

Re: Info: mapping multiple BARs. Your kernel is fine.

[Dave Jones]

On Thu, Apr 17, 2014 at 12:26:37PM -0600, Bjorn Helgaas wrote:
 > Thanks a lot for testing this out and debugging my issues.
 > 
 > Here's a new version that looks for both device IDs I know about.

I can confirm this patch does fix the backtrace.
I disabled lockdep, and now I can get to X each boot, but I still see
a black screen rather than a console between modesetting becoming active, and X starting.

(The lockdep thing turned out to be a known XFS false positive, but for
 some reason it actually caused X to lock up)

 > I'm still nervous about the modeset problem Dave is seeing.  Since the
 > original patch wouldn't find an 8086:0c00 device on Dave's system, it
 > should have done nothing.  But since it caused a modesetting problem,
 > there's something else doing on that I don't understand.

I don't know if it's relevant, but this laptop (and I suspect many other
thinkpads which seem affected) have dual gfx, both show up on the bus,
even if though the nvidia isn't in use..

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 2200
        Flags: bus master, fast devsel, latency 0, IRQ 44
        Memory at f1000000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 6000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915

01:00.0 3D controller: NVIDIA Corporation GF117M [GeForce 610M/710M/820M / GT 620M/625M/630M/720M] (rev a1)
        Subsystem: Lenovo NVS 5200M
        Flags: bus master, fast devsel, latency 0, IRQ 11
        Memory at f0000000 (32-bit, non-prefetchable) [size=16M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at d0000000 (64-bit, prefetchable) [size=32M]
        I/O ports at 5000 [size=128]
        Expansion ROM at <ignored> [disabled]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
        Capabilities: [78] Express Endpoint, MSI 00
        Capabilities: [b4] Vendor Specific Information: Len=14 <?>
        Capabilities: [100] Virtual Channel
        Capabilities: [128] Power Budgeting <?>
        Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>

Just as X starts up, I see this in dmesg..

[   42.879049] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun

	Dave

Re: Info: mapping multiple BARs. Your kernel is fine.

[Borislav Petkov]

On Thu, Apr 17, 2014 at 03:52:40PM -0400, Dave Jones wrote:
> Just as X starts up, I see this in dmesg..
> 
> [   42.879049] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun

FWIW, I have that too. It should be something i915-related:

[    0.617673] [drm] Memory usable by graphics device = 2048M
[    0.694445] i915 0000:00:02.0: irq 42 for MSI/MSI-X
[    0.694549] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    0.694631] [drm] Driver supports precise vblank timestamp query.
[    0.695313] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    0.788300] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[    0.799829] fbcon: inteldrmfb (fb0) is primary device
[    1.176845] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

Re: Info: mapping multiple BARs. Your kernel is fine.

[Dave Jones]

On Thu, Apr 17, 2014 at 10:01:27PM +0200, Borislav Petkov wrote:
 > On Thu, Apr 17, 2014 at 03:52:40PM -0400, Dave Jones wrote:
 > > Just as X starts up, I see this in dmesg..
 > > 
 > > [   42.879049] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun
 > 
 > FWIW, I have that too. It should be something i915-related:
 > 
 > [    0.617673] [drm] Memory usable by graphics device = 2048M
 > [    0.694445] i915 0000:00:02.0: irq 42 for MSI/MSI-X
 > [    0.694549] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
 > [    0.694631] [drm] Driver supports precise vblank timestamp query.
 > [    0.695313] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
 > [    0.788300] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
 > [    0.799829] fbcon: inteldrmfb (fb0) is primary device
 > [    1.176845] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun

Can you send me your .config off-list ?
I wonder if this is something config specific that's causing me to see
this, and you not, given we've apparently got similar machines.

	Dave

Re: Info: mapping multiple BARs. Your kernel is fine.

[Dave Jones]

On Thu, Apr 17, 2014 at 04:03:52PM -0400, Dave Jones wrote:
 > On Thu, Apr 17, 2014 at 10:01:27PM +0200, Borislav Petkov wrote:
 >  > On Thu, Apr 17, 2014 at 03:52:40PM -0400, Dave Jones wrote:
 >  > > Just as X starts up, I see this in dmesg..
 >  > > 
 >  > > [   42.879049] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun
 >  > 
 >  > FWIW, I have that too. It should be something i915-related:
 >  > 
 >  > [    0.617673] [drm] Memory usable by graphics device = 2048M
 >  > [    0.694445] i915 0000:00:02.0: irq 42 for MSI/MSI-X
 >  > [    0.694549] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
 >  > [    0.694631] [drm] Driver supports precise vblank timestamp query.
 >  > [    0.695313] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
 >  > [    0.788300] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
 >  > [    0.799829] fbcon: inteldrmfb (fb0) is primary device
 >  > [    1.176845] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun
 > 
 > Can you send me your .config off-list ?
 > I wonder if this is something config specific that's causing me to see
 > this, and you not, given we've apparently got similar machines.

ok, with your config I get back to a console after the modesetting
switch, but then it hangs in USB init.

Hrmm.

	Dave

Re: Info: mapping multiple BARs. Your kernel is fine.

[Borislav Petkov]

On Thu, Apr 17, 2014 at 04:53:55PM -0400, Dave Jones wrote:
> ok, with your config I get back to a console after the modesetting
> switch, but then it hangs in USB init.

Maybe because of our machines are not that similar there? Can you take
my config but paste the usb part of yours and see whether it boots fine
then? It could be yours and mine have different USB hw...

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

Re: Info: mapping multiple BARs. Your kernel is fine.

[Borislav Petkov]

On Thu, Apr 17, 2014 at 05:30:27PM -0400, Dave Jones wrote:
> I think it's just implicated because that's the next thing that seems
> to init after the modeswitch. The config differences are small, just
> things like =m instead of =y or vice-versa.
>
> I'm about to head into a long weekend, so I'll get back to this on
> Monday, but for now I'm out of ideas.

This is for when you get back: :-)

Can you debug that hang a bit more, like enable some sensible options
under "Kernel Hacking" or somesuch, boot with initcall_debug, add
more printks at key places? If the machine would tell us why exactly
it hangs, we might have an idea, like corruption, transaction stall,
whatever...

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

Re: Info: mapping multiple BARs. Your kernel is fine.

[Stephane Eranian]

On Wed, Apr 16, 2014 at 1:31 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
> On Wed, Apr 16, 2014 at 09:04:04PM +0200, Borislav Petkov wrote:
>> On Thu, Mar 20, 2014 at 02:48:30PM -0600, Bjorn Helgaas wrote:
>> > Right.  Even if we had this long-term solution, we'd still have
>> > Stephane's current problem, because the PNP0C02 _CRS is still wrong.
>> >
>> > We do have a drivers/pnp/quirks.c where we could conceivably adjust
>> > the PNP resource if we found the matching PCI device and MCHBAR.  That
>> > should solve Stephane's problem even with the current
>> > drivers/pnp/system.c.
>>
>> Guys, this still triggers in -rc1. Do we have a fix or something
>> testable at least?
>
> Hi Boris,
>
> Can you try the patch below?
>
>
>
> PNP: Work around Haswell BIOS defect in MCH area reporting
>
> From: Bjorn Helgaas <bhelgaas@google.com>
>
> Work around a Haswell BIOS defect that causes part of the MCH area to be
> unreported.
>
> MCHBAR is not an architected PCI BAR, so MCH space is usually reported as a
> PNP0C02 resource.  The MCH space was 16KB prior to Haswell, but it is 32KB
> in Haswell.  Some Haswell BIOSes still report a PNP0C02 resource that is
> only 16KB, which means the rest of the MCH space is consumed but
> unreported.
>
Why are you saying this is Haswell vs. others. I see the problem on my
IvyBridge laptop, like Boris.

> This can cause resource map sanity check warnings or (theoretically) a
> device conflict if we assigned the unreported space to another device.
>
> The Intel perf event uncore driver tripped over this when it claimed the
> MCH region:
>
>   resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
>   Info: mapping multiple BARs. Your kernel is fine.
>
> To prevent this, if we find a PNP0C02 resource that covers part of the MCH
> space, extend it to cover the entire space.
>
> Link: http://lkml.kernel.org/r/20140224162400.GE16457@pd.tnic
> Reported-by: Borislav Petkov <bp@alien8.de>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> ---
>  drivers/pnp/quirks.c |   52 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 52 insertions(+)
>
> diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
> index 258fef272ea7..023edf592371 100644
> --- a/drivers/pnp/quirks.c
> +++ b/drivers/pnp/quirks.c
> @@ -334,6 +334,57 @@ static void quirk_amd_mmconfig_area(struct pnp_dev *dev)
>  }
>  #endif
>
> +static void quirk_intel_haswell_mch(struct pnp_dev *dev)
> +{
> +       struct pci_dev *host;
> +       u32 addr_lo, addr_hi;
> +       struct pci_bus_region region;
> +       struct resource mch;
> +       struct pnp_resource *pnp_res;
> +       struct resource *res;
> +
> +       host = pci_get_device(PCI_VENDOR_ID_INTEL, 0x0c00, NULL);
> +       if (!host)
> +               return;
> +
> +       /*
> +        * MCHBAR is not an architected PCI BAR, so MCH space is usually
> +        * reported as a PNP0C02 resource.  The MCH space was 16KB prior to
> +        * Haswell, but it is 32KB in Haswell.  Some Haswell BIOSes still
> +        * report a PNP0C02 resource that is only 16KB, which means the
> +        * rest of the MCH space is consumed but unreported.
> +        */
> +
> +       /*
> +        * Read MCHBAR for Host Member Mapped Register Range Base
> +        * https://www-ssl.intel.com/content/www/us/en/processors/core/4th-gen-core-family-desktop-vol-2-datasheet
> +        * Sec 3.1.12.
> +        */
> +       pci_read_config_dword(host, 0x48, &addr_lo);
> +       region.start = addr_lo & ~0x7fff;
> +       pci_read_config_dword(host, 0x4c, &addr_hi);
> +       region.start |= (dma_addr_t) addr_hi << 32;
> +       region.end = region.start + 32*1024 - 1 ;
> +       pcibios_bus_to_resource(host->bus, &mch, &region);
> +
> +       list_for_each_entry(pnp_res, &dev->resources, list) {
> +               res = &pnp_res->res;
> +               if (res->end < mch.start || res->start > mch.end)
> +                       continue;       /* no overlap */
> +               if (res->start == mch.start && res->end == mch.end)
> +                       continue;       /* exact match */
> +
> +               dev_info(&dev->dev, FW_BUG
> +                        "%pR covers only part of Intel Haswell MCH; extending to %pR\n",
> +                        res, &mch);
> +               res->start = mch.start;
> +               res->end = mch.end;
> +               break;
> +       }
> +
> +       pci_dev_put(host);
> +}
> +
>  /*
>   *  PnP Quirks
>   *  Cards or devices that need some tweaking due to incomplete resource info
> @@ -364,6 +415,7 @@ static struct pnp_fixup pnp_fixups[] = {
>  #ifdef CONFIG_AMD_NB
>         {"PNP0c01", quirk_amd_mmconfig_area},
>  #endif
> +       {"PNP0c02", quirk_intel_haswell_mch},
>         {""}
>  };
>

Re: Info: mapping multiple BARs. Your kernel is fine.

[Bjorn Helgaas]

On Wed, Apr 16, 2014 at 5:08 PM, Stephane Eranian <eranian@google.com> wrote:
> On Wed, Apr 16, 2014 at 1:31 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
>> On Wed, Apr 16, 2014 at 09:04:04PM +0200, Borislav Petkov wrote:
>>> On Thu, Mar 20, 2014 at 02:48:30PM -0600, Bjorn Helgaas wrote:
>>> > Right.  Even if we had this long-term solution, we'd still have
>>> > Stephane's current problem, because the PNP0C02 _CRS is still wrong.
>>> >
>>> > We do have a drivers/pnp/quirks.c where we could conceivably adjust
>>> > the PNP resource if we found the matching PCI device and MCHBAR.  That
>>> > should solve Stephane's problem even with the current
>>> > drivers/pnp/system.c.
>>>
>>> Guys, this still triggers in -rc1. Do we have a fix or something
>>> testable at least?
>>
>> Hi Boris,
>>
>> Can you try the patch below?
>>
>>
>>
>> PNP: Work around Haswell BIOS defect in MCH area reporting
>>
>> From: Bjorn Helgaas <bhelgaas@google.com>
>>
>> Work around a Haswell BIOS defect that causes part of the MCH area to be
>> unreported.
>>
>> MCHBAR is not an architected PCI BAR, so MCH space is usually reported as a
>> PNP0C02 resource.  The MCH space was 16KB prior to Haswell, but it is 32KB
>> in Haswell.  Some Haswell BIOSes still report a PNP0C02 resource that is
>> only 16KB, which means the rest of the MCH space is consumed but
>> unreported.
>>
> Why are you saying this is Haswell vs. others. I see the problem on my
> IvyBridge laptop, like Boris.

Ah, good question.  Somewhere I got pointed to the Haswell docs, which
say 32KB.  I don't know what other parts have 32KB MCH spaces.  If we
could figure out a list of device IDs with 32KB spaces, we could add
that to the quirk.

But I don't know how to come up with a complete list.

Bjorn