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

Stephane Eranian
2014-02-26T09:47:05Z

Hi,

Ok, so I am getting the same error message as you.
I checked my syslog now.

I have my uncore_imc addr=0xfed10000 (after masking)

And I also have pnp 00:01 overlapping the imc range completely.

What pnp device does it really represent? the DRAM controller?

So I think my laptop behaves like yours.

On Wed, Feb 26, 2014 at 10:29 AM, Borislav Petkov <bp@alien8.de> wrote:
> On Wed, Feb 26, 2014 at 07:56:58AM +0100, Stephane Eranian wrote:
>> > Also IVB, model 58?
>> >
>> Yes.
>
> Right, so it must be chipset-specific.
>
>> > Dunno. What do you mean by "pm callbacks" exactly? I don't know that
>> > code so I have to ask.
>> >
>> power management callbacks.
>
> Ok, just as I thought. But why would they be relevant if this happens
> very early during boot?
>
>> > #define PCI_DEVICE_ID_INTEL_IVB_IMC 0x0154
>> Yes. Needs to point to the DRAM controller.
>
> It seems I have it :-)
>
> $ lspci -xxx -s 00.0
> 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 fa 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 11 00 00 00 07 00 90 df 01 00 00 db
> 60: 05 00 00 f8 00 00 00 00 01 80 d1 fe 00 00 00 00
> 70: 00 00 00 fe 01 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 fe 01 00 00 00 01 00 50 1e 02 00 00 00
> a0: 01 00 00 00 02 00 00 00 01 00 60 1e 02 00 00 00
> b0: 01 00 a0 db 01 00 80 db 01 00 00 db 01 00 a0 df
> 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 e2 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
>
> Anyway, here's some more debugging output and some more staring:
>
> So we're correctly getting 0x154 and then snb_uncore_imc_init_box()
> tries to ioremap 0xfed10000 but this fails the resource map check with:
>
> [ 0.485356] resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
>
> and the pnp 00:01 device already partially occupies that range (from
> /proc/iomem):
>
> fed10000-fed13fff : pnp 00:01
>
> Oh, and snb_uncore_imc_init_box() gets that address from
> SNB_UNCORE_PCI_IMC_BAR_OFFSET and SNB_UNCORE_PCI_IMC_BAR_OFFSET+4 and
> they start at offset 0x48 in the PCI config space above, i.e.
>
> 40: 01 90 d1 fe 00 00 00 00 01 00 d1 fe 00 00 00 00
> ^^^^^^^^^^^^^^^^^^^^^^^
>
> which is 0x000000fed10001 (the 0x1 bit disappears after addr &= ~(PAGE_SIZE - 1);)
>
> So I'm guessing it is time to talk to platform guys and ask them why
> they're putting SNB_UNCORE_PCI_IMC_BAR_OFFSET{,+4} in an overlapping
> range with pnp 00:01.
>
> [ 0.484023] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
> [ 0.484108] software IO TLB [mem 0xcac30000-0xcec30000] (64MB) mapped at [ffff8800cac30000-ffff8800cec2ffff]
> [ 0.484971] DBG: will get device: 0x8086:154
> [ 0.485054] DBG: Got device, bus: 0x0
> [ 0.485254] DBG: ioremapping addr: 0xfed10000
> [ 0.485356] resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01
> [ 0.485460] ------------[ cut here ]------------
> [ 0.485544] WARNING: CPU: 2 PID: 1 at arch/x86/mm/ioremap.c:171 __ioremap_caller+0x372/0x380()
> [ 0.485643] Info: mapping multiple BARs. Your kernel is fine.
> [ 0.485709] Modules linked in:
> [ 0.485935] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc4+ #6
> [ 0.486019] Hardware name: LENOVO 2320CTO/2320CTO, BIOS G2ET86WW (2.06 ) 11/13/2012
> [ 0.486117] 00000000000000ab ffff880213d01ad8 ffffffff81611339 0000000000000006
> [ 0.486411] ffff880213d01b28 ffff880213d01b18 ffffffff8104e9cc ffff880213d01b08
> [ 0.488308] ffffc90000c58000 00000000fed10000 00000000fed10000 0000000000006000
> [ 0.488595] Call Trace:
> [ 0.488671] [<ffffffff81611339>] dump_stack+0x4f/0x7c
> [ 0.488754] [<ffffffff8104e9cc>] warn_slowpath_common+0x8c/0xc0
> [ 0.488877] [<ffffffff8104eab6>] warn_slowpath_fmt+0x46/0x50
> [ 0.488966] [<ffffffff8103f1f2>] __ioremap_caller+0x372/0x380
> [ 0.489052] [<ffffffff810211b6>] ? snb_uncore_imc_init_box+0x76/0xa0
> [ 0.489137] [<ffffffff8103f257>] ioremap_nocache+0x17/0x20
> [ 0.489221] [<ffffffff810211b6>] snb_uncore_imc_init_box+0x76/0xa0
> [ 0.489307] [<ffffffff81022935>] uncore_pci_probe+0xe5/0x1e0
> [ 0.489391] [<ffffffff812d488e>] local_pci_probe+0x4e/0xa0
> [ 0.489474] [<ffffffff81418a69>] ? get_device+0x19/0x20
> [ 0.489558] [<ffffffff812d5ce1>] pci_device_probe+0xe1/0x130
> [ 0.489642] [<ffffffff8141d3db>] driver_probe_device+0x7b/0x240
> [ 0.489726] [<ffffffff8141d64b>] __driver_attach+0xab/0xb0
> [ 0.489834] [<ffffffff8141d5a0>] ? driver_probe_device+0x240/0x240
> [ 0.489920] [<ffffffff8141b72e>] bus_for_each_dev+0x5e/0x90
> [ 0.490003] [<ffffffff8141ceee>] driver_attach+0x1e/0x20
> [ 0.490086] [<ffffffff8141ca67>] bus_add_driver+0x117/0x230
> [ 0.490170] [<ffffffff8141dd44>] driver_register+0x64/0xf0
> [ 0.490251] [<ffffffff812d4c24>] __pci_register_driver+0x64/0x70
> [ 0.490337] [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
> [ 0.490421] [<ffffffff81d03331>] intel_uncore_init+0x196/0x462
> [ 0.490504] [<ffffffff81d0319b>] ? uncore_types_init+0x19c/0x19c
> [ 0.490591] [<ffffffff8100029e>] do_one_initcall+0x4e/0x170
> [ 0.490676] [<ffffffff81071100>] ? parse_args+0x50/0x360
> [ 0.490762] [<ffffffff81cfbfb8>] kernel_init_freeable+0x106/0x19a
> [ 0.490863] [<ffffffff81cfb83b>] ? do_early_param+0x86/0x86
> [ 0.490948] [<ffffffff81607f00>] ? rest_init+0xd0/0xd0
> [ 0.491032] [<ffffffff81607f0e>] kernel_init+0xe/0xf0
> [ 0.491116] [<ffffffff81621fac>] ret_from_fork+0x7c/0xb0
> [ 0.491199] [<ffffffff81607f00>] ? rest_init+0xd0/0xd0
> [ 0.491289] ---[ end trace b31a7f760e34b24a ]---
> [ 0.491547] RAPL PMU detected, hw unit 2^-16 Joules, API unit is 2^-32 Joules, 3 fixed counters 163840 ms ovfl timer
> [ 0.493962] futex hash table entries: 1024 (order: 5, 131072 bytes)
>
> --
> Regards/Gruss,
> Boris.
>
> Sent from a fat crate under my desk. Formatting is fine.
> --