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64bit DMA in i2o_block [message #6768]

Fri, 22 September 2006 09:10

vaverin
Messages: 708
Registered: September 2005

Senior Member

Markus,

I've found that your driver does not work correctly with following options:
CONFIG_I2O_EXT_ADAPTEC=y
# CONFIG_I2O_EXT_ADAPTEC_DMA64 is not set

I've checked it on 2.6.18 kernel on x86_64 node with 4Gb memory.

I would note that I've not noticed any bugs on x86 kernels, but x86_64 does not
work at all.

The behaviors of x86_64 kernels can differ:
sometimes driver can not find partition table:
i2o/hda: unknown partition table

sometimes it find not all partition:
i2o/hda: i2o/hda1 i2o/hda2 i2o/hda3 i2o/hda4 < >

in other cases it detects devices well but corrupt the memory and filesystem:
Sep 21 16:46:09 ts10 block-osm: registered device at major 80
Sep 21 16:46:09 ts10 i2o/hda: i2o/hda1 i2o/hda2 i2o/hda3 i2o/hda4 < i2o/hda5 >
Sep 21 16:46:09 ts10 block-osm: device added (TID: 207): i2o/hda
Sep 21 16:46:09 ts10 kjournald starting. Commit interval 5 seconds
Sep 21 16:46:09 ts10 EXT3-fs: mounted filesystem with ordered data mode.
Sep 21 16:46:10 ts10 Freeing unused kernel memory: 236k freed
Sep 21 16:46:10 ts10 hotplug[961]: segfault at 0000000000000008 rip
00000032411088cf rsp 00007fff5b189050 error 4

When I enabled CONFIG_I2O_EXT_ADAPTEC_DMA64 -- all the troubles went away.

I've tried to investigate this issue, but I've not found and documentation
described format of Adaptec's private messages.

I would like to ask you, is this behavior specific for my hardware (Adaptec
ASR-2010S I2O Zero Channel)? If not, I believe it makes sense to enable
CONFIG_I2O_EXT_ADAPTEC_DMA64 in Kconfig by default for 64-bit kernels.

Thank you,
Vasily Averin

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Re: 64bit DMA in i2o_block [message #6775 is a reply to message #6768]

Fri, 22 September 2006 10:14

Markus Lidel
Messages: 7
Registered: March 2006

Junior Member

Hello,

Vasily Averin wrote:
> I've found that your driver does not work correctly with following options:
> CONFIG_I2O_EXT_ADAPTEC=y
> # CONFIG_I2O_EXT_ADAPTEC_DMA64 is not set
> I've checked it on 2.6.18 kernel on x86_64 node with 4Gb memory.

That could be the reason for the problems. I've only tried it on x86_64
machines with < 4 GB memory...

> I would note that I've not noticed any bugs on x86 kernels, but x86_64 does not
> work at all.
> The behaviors of x86_64 kernels can differ:
> sometimes driver can not find partition table:
> i2o/hda: unknown partition table
> sometimes it find not all partition:
> i2o/hda: i2o/hda1 i2o/hda2 i2o/hda3 i2o/hda4 < >
> in other cases it detects devices well but corrupt the memory and filesystem:
> Sep 21 16:46:09 ts10 block-osm: registered device at major 80
> Sep 21 16:46:09 ts10 i2o/hda: i2o/hda1 i2o/hda2 i2o/hda3 i2o/hda4 < i2o/hda5 >
> Sep 21 16:46:09 ts10 block-osm: device added (TID: 207): i2o/hda
> Sep 21 16:46:09 ts10 kjournald starting. Commit interval 5 seconds
> Sep 21 16:46:09 ts10 EXT3-fs: mounted filesystem with ordered data mode.
> Sep 21 16:46:10 ts10 Freeing unused kernel memory: 236k freed
> Sep 21 16:46:10 ts10 hotplug[961]: segfault at 0000000000000008 rip
> 00000032411088cf rsp 00007fff5b189050 error 4
> When I enabled CONFIG_I2O_EXT_ADAPTEC_DMA64 -- all the troubles went away.
> I've tried to investigate this issue, but I've not found and documentation
> described format of Adaptec's private messages.
> I would like to ask you, is this behavior specific for my hardware (Adaptec
> ASR-2010S I2O Zero Channel)? If not, I believe it makes sense to enable
> CONFIG_I2O_EXT_ADAPTEC_DMA64 in Kconfig by default for 64-bit kernels.

I believe it's a driver issue. Do you have a testing-system where you
could try out the appended patch?

Thank you very much.

Best regards,

Markus Lidel
------------------------------------------
Markus Lidel (Senior IT Consultant)

Shadow Connect GmbH
Carl-Reisch-Weg 12
D-86381 Krumbach
Germany

Phone: +49 82 82/99 51-0
Fax: +49 82 82/99 51-11

E-Mail: Markus.Lidel@shadowconnect.com
URL: http://www.shadowconnect.com

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Re: 64bit DMA in i2o_block [message #6780 is a reply to message #6775]

Fri, 22 September 2006 10:54

Andi Kleen
Messages: 33
Registered: February 2006

Member

Markus Lidel <Markus.Lidel@shadowconnect.com> writes:
>
> I believe it's a driver issue. Do you have a testing-system where you
> could try out the appended patch?

So it would bug instead?

Can you please just get rid of that CONFIG? Such things shouldn't
be CONFIGs, but have a suitable default. In particular drivers
running under 64bit should always support 64bit DMA.

-Andi

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Re: 64bit DMA in i2o_block [message #6783 is a reply to message #6775]

Fri, 22 September 2006 11:39

vaverin
Messages: 708
Registered: September 2005

Senior Member

Markus Lidel wrote:
> Hello,
>
> Vasily Averin wrote:
>> I've found that your driver does not work correctly with following
>> options:
>> CONFIG_I2O_EXT_ADAPTEC=y
>> # CONFIG_I2O_EXT_ADAPTEC_DMA64 is not set
>> I've checked it on 2.6.18 kernel on x86_64 node with 4Gb memory.
>
> I believe it's a driver issue. Do you have a testing-system where you
> could try out the appended patch?

Done. troubles are present, BUG_ON did not trigger.

thank you,
Vasily Averin

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Re: 64bit DMA in i2o_block [message #6784 is a reply to message #6780]

Fri, 22 September 2006 11:47

Markus Lidel
Messages: 7
Registered: March 2006

Junior Member

Hello,

Andi Kleen wrote:
> Markus Lidel <Markus.Lidel@shadowconnect.com> writes:
>> I believe it's a driver issue. Do you have a testing-system where you
>> could try out the appended patch?
> So it would bug instead?

Yes, because ATM i don't know why it doesn't work. It's just for debugging.

> Can you please just get rid of that CONFIG? Such things shouldn't
> be CONFIGs, but have a suitable default. In particular drivers
> running under 64bit should always support 64bit DMA.

The 64-bit DMA is only available on Adaptec controllers, all other I2O
controllers only work with 32-bit DMA. Although the 64-bit DMA is (as far
as i can remember) slower then the 32-bit DMA and is therefore only
useful on systems which run out of memory.

Best regards,

Markus Lidel
------------------------------------------
Markus Lidel (Senior IT Consultant)

Shadow Connect GmbH
Carl-Reisch-Weg 12
D-86381 Krumbach
Germany

Phone: +49 82 82/99 51-0
Fax: +49 82 82/99 51-11

E-Mail: Markus.Lidel@shadowconnect.com
URL: http://www.shadowconnect.com

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Re: 64bit DMA in i2o_block [message #7121 is a reply to message #6768]

Wed, 04 October 2006 09:42

vaverin
Messages: 708
Registered: September 2005

Senior Member

Markus,

Thank you very much for your help!

Vasily Averin

Markus Lidel wrote:
> Hello,
>
> OK, i'm done now. I've tested all i thought it could cause the failure.
> But unfortunately without success. So i'll submit an patch which set the
> 64-bit DMA as default.
>
> Thank you very much again for your help!
>
>
>
> Best regards,
>
>
> Markus Lidel
> ------------------------------------------
> Markus Lidel (Senior IT Consultant)
>
> Shadow Connect GmbH
> Carl-Reisch-Weg 12
> D-86381 Krumbach
> Germany
>
> Phone: +49 82 82/99 51-0
> Fax: +49 82 82/99 51-11
>
> E-Mail: Markus.Lidel@shadowconnect.com
> URL: http://www.shadowconnect.com

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