linux-kernel - Re: Linux 2.6.33-rc1

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Message-ID: <64bb37e0912201136m5bd46867s73ddc43c85f80b38@mail.gmail.com>
Date:	Sun, 20 Dec 2009 20:36:40 +0100
From:	Torsten Kaiser <just.for.lkml@...glemail.com>
To:	Borislav Petkov <petkovbb@...glemail.com>,
	Torsten Kaiser <just.for.lkml@...glemail.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: Linux 2.6.33-rc1

On Sun, Dec 20, 2009 at 8:14 PM, Borislav Petkov
<petkovbb@...glemail.com> wrote:
> On Sun, Dec 20, 2009 at 06:53:24PM +0100, Torsten Kaiser wrote:
>> On Sat, Dec 19, 2009 at 8:54 PM, Torsten Kaiser
>> <just.for.lkml@...glemail.com> wrote:
>> > [    5.061998] EDAC MC: Ver: 2.1.0 Dec 18 2009
>> > [    5.062186] EDAC amd64_edac:  Ver: 3.3.0 Dec 18 2009
>> > [    5.062235] EDAC amd64: ECC is enabled by BIOS.
>> > [    5.062297] EDAC amd64: ECC is enabled by BIOS.
>> > [    5.128332] EDAC MC: Rev F or later detected
>> > [    5.134186] EDAC amd64: amd64_read_mc_registers: error reading F2x190.
>> > [    5.142290] EDAC amd64: amd64_read_mc_registers: error reading F2x194.
>> > [    5.150355] EDAC MC: DCT0 chip selects:
>> > [    5.150357] EDAC MC:  0:   512MB 1:   512MB
>> > [    5.150358] EDAC MC:  2:     0MB 3:     0MB
>> > [    5.150361] EDAC MC:  4:     0MB 5:     0MB
>> > [    5.150362] EDAC MC:  6:     0MB 7:     0MB
>> > [    5.150519] EDAC MC0: Giving out device to 'amd64_edac' 'RevF': DEV
>> > 0000:00:18.2
>> > [    5.150522] EDAC MC: Rev F or later detected
>> > [    5.150530] EDAC amd64: amd64_read_mc_registers: error reading F2x190.
>> > [    5.150532] EDAC amd64: amd64_read_mc_registers: error reading F2x194.
>> > [    5.150533] EDAC MC: DCT0 chip selects:
>> > [    5.150535] EDAC MC:  0:   512MB 1:   512MB
>> > [    5.150536] EDAC MC:  2:     0MB 3:     0MB
>> > [    5.150537] EDAC MC:  4:     0MB 5:     0MB
>> > [    5.150539] EDAC MC:  6:     0MB 7:     0MB
>> > [    5.150664] EDAC MC1: Giving out device to 'amd64_edac' 'RevF': DEV
>> > 0000:00:19.2
>> > [    5.150742] EDAC PCI0: Giving out device to module 'amd64_edac'
>> > controller 'EDAC PCI
>> >  controller': DEV '0000:00:18.2' (POLLED)
>> >
>> > The system has 4x 1GB RAM sticks (2 on each CPU).
>
> What are those DIMMs: single or dual ranked? Can you give me the exact
> model name?

The bill says:
DDR2 DIMM 1024MB Kingston ValueRAM
PC2-5300 667MHz regECC CL5,dual rank, x8
Modell: KVR667D2D8P5/1G

>> After reading the code in drivers/edac/amd64_edac.c and the
>> documentation in the AMD reference doc (#32559, I have Rev. 3.08) the
>> bug is, that the current code does not try to differentiate between
>> the 64bit and the 128bit mode.
>> In the doc the sizes for the 64bit mode in table 10, section 4.5.8.1
>> are identical to the table ddr2_dbam in amd64_edac.c.
>> But for the 128bit mode the table 11 should be used, there the sizes
>> are doubled.
>>
>> The code uses the bit 11 (named F10_WIDTH_128 in amd64_edac.h) of the
>> lower DRAM configuration register to determine the number of channels
>> in k8_early_channel_count(), but this is not used in
>> amd64_debug_display_dimm_sizes()
>
> That might be the case, can you enable CONFIG_EDAC_DEBUG and
> CONFIG_EDAC_DEBUG_VERBOSE and rebuild your kernel, please? Then, send me
> the _whole_ dmesg output. If the output appears truncated, try enlarging
> the log buffer size by setting log_buf_len on the kernel command line to
> something large, i.e. 'log_buf_len=10M'.

Is attached...

>> > And there is no line like 'EDAC PCI0' for the DRAM controller of the
>> > second CPU (19.2). Is that normal?
>>
>> amd64_edac_init() calls amd64_init_2nd_stage() for each northbrigde,
>> but amd64_setup_pci_device() only once.
>>
>> But from looking at the code, I can't see if a second device is needed or not.
>
> No, its not since it seems like the EDAC PCI code scans all known PCI
> devices anyways.

OK, just found it curious, that there was a device for 18.2, but not for 19.2.

Torsten
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