[Bug 15362] New: MPT Fusion SCSI drives no longer appear - suspect PCI bus scan bug

[Bug 15362] New: MPT Fusion SCSI drives no longer appear - suspect PCI bus scan bug

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15362

           Summary: MPT Fusion SCSI drives no longer appear - suspect PCI
                    bus scan bug
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 2.6.30-1, 2.6.30-2, 2.6.32-trunk
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: SCSI
        AssignedTo: linux-scsi@vger.kernel.org
        ReportedBy: pegasus@renegadetech.com
        Regression: Yes


Created an attachment (id=25130)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25130)
2.6.26 dmesg

Since upgrading to the 2.6.30 kernel on an AMD64 platform, drives attached to
my LSI/MPT SCSI controller are no longer visible. If I boot using the 2.6.26-2
kernel, it works fine. The SCSI controller doesn't even show up in lspci in
kernel versions above 2.6.26. (I do have the controller's BIOS disabled
however, but I understand that doesn't matter since the kernel will poll it
anyway, as 2.6.26 does. I tested with the controller's BIOS enabled too and it
doesn't make a difference.)

This has already been submitted to Debian as bug #543308, but evidence points
to a bug in the kernel PCI bus scanning code, since the following PCI devices
show up on 2.6.26-2 but not 2.6.30-1 and up:

0001:40:01.0 0604: 1022:7450 (rev 12)
0001:40:01.1 0800: 1022:7451 (rev 01)
0001:40:02.0 0604: 1022:7450 (rev 12)
0001:40:02.1 0800: 1022:7451 (rev 01)
0001:61:06.0 0100: 1000:0030 (rev 07)
0001:61:06.1 0100: 1000:0030 (rev 07)
0002:80:00.0 0580: 10de:005e (rev a3)
0002:80:01.0 0580: 10de:00d3 (rev a3)

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[Bug 15362] MPT Fusion SCSI drives no longer appear - suspect PCI bus scan bug

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15362





--- Comment #1 from Sean M. Pappalardo <pegasus@renegadetech.com>  2010-02-20 15:05:37 ---
Created an attachment (id=25131)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25131)
lspci -n on 2.6.26

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[Bug 15362] MPT Fusion SCSI drives no longer appear - suspect PCI bus scan bug

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15362





--- Comment #2 from Sean M. Pappalardo <pegasus@renegadetech.com>  2010-02-20 15:06:08 ---
Created an attachment (id=25132)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25132)
2.6.26 lspci -v

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[Bug 15362] MPT Fusion SCSI drives no longer appear - suspect PCI bus scan bug

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15362





--- Comment #3 from Sean M. Pappalardo <pegasus@renegadetech.com>  2010-02-20 15:07:10 ---
Created an attachment (id=25133)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25133)
2.6.32 dmesg

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[Bug 15362] MPT Fusion SCSI drives no longer appear - suspect PCI bus scan bug

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http://bugzilla.kernel.org/show_bug.cgi?id=15362





--- Comment #4 from Sean M. Pappalardo <pegasus@renegadetech.com>  2010-02-20 15:07:48 ---
Created an attachment (id=25134)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25134)
2.6.32 lspci -n

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[Bug 15362] MPT Fusion SCSI drives no longer appear - suspect PCI bus scan bug

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15362


Sean M. Pappalardo <pegasus@renegadetech.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #25131|lspci -n on 2.6.26          |2.6.26 lspci -n
        description|                            |




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[Bug 15362] MPT Fusion SCSI drives no longer appear - suspect PCI bus scan bug

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http://bugzilla.kernel.org/show_bug.cgi?id=15362





--- Comment #5 from Sean M. Pappalardo <pegasus@renegadetech.com>  2010-02-20 15:10:08 ---
I have dmesg and lspci -n and -v from 2.6.30 as well but they're similar to
2.6.32. Just let me know if you want them too.

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[Bug 15362] MPT Fusion SCSI drives no longer appear - suspect PCI bus scan bug

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http://bugzilla.kernel.org/show_bug.cgi?id=15362


Matthew Wilcox <matthew@wil.cx> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |matthew@wil.cx
          Component|SCSI                        |PCI
         AssignedTo|linux-scsi@vger.kernel.org  |drivers_pci@kernel-bugs.osd
                   |                            |l.org
            Product|IO/Storage                  |Drivers




--- Comment #6 from Matthew Wilcox <matthew@wil.cx>  2010-02-20 15:22:09 ---
OK, this is clearly a PCI issue, nothing to do with SCSI.

It looks like everything outside domain 0 is now not found.  This seems to be
due to the MMCONFIG access option not being used.

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