[Xen-bugs] [Bug 920] New: Failed while setting pci_set_power_state() from a 'PCI-passthrued' driver domain

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=920

           Summary: Failed while setting pci_set_power_state() from a 'PCI-
                    passthrued' driver domain
           Product: Xen
           Version: 3.0.4
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hardware Support
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: jambunathan@xxxxxxxxxx
                CC: jambunathan@xxxxxxxxxx


(Accepted as a bug. Related mail thread -
http://lists.xensource.com/archives/html/xen-devel/2007-03/msg00357.html)

Shouldn't pciback_field_is_dup(dev, field->offset) be scoped to include the
base_offset as well?

Currently with xen-3.0.4 the issue is this:

Adding of  PCI_PM_CTRL (at offset 4)  to the 'config_fields list' gets skipped
because it ends up being a duplicate of PCI_COMMAND (at offset 4 as well).  As
a result when a PCI device behind a PCI frontend does a power up using
pci_enable_device() the following message gets flashed on the console.

pciback 0000:0b:00.3: Driver tried to write to a read-only configuration space
field at offset 0x84, size 2. This may be harmless, but if you have problems
with your device:
1) see permissive attribute in sysfs
2) report problems to the xen-devel mailing list along with details of your
device obtained from lspci. 

Here is quick log from frontend debug showing this happening:

pciback 0000:0b:00.3: added config field at offset 0x04
pciback 0000:0b:00.3: added config field at offset 0x3c
pciback 0000:0b:00.3: added config field at offset 0x3d
pciback 0000:0b:00.3: added config field at offset 0x0c
pciback 0000:0b:00.3: added config field at offset 0x0d
pciback 0000:0b:00.3: added config field at offset 0x0f
pciback 0000:0b:00.3: added config field at offset 0x10
pciback 0000:0b:00.3: added config field at offset 0x14
pciback 0000:0b:00.3: added config field at offset 0x18
pciback 0000:0b:00.3: added config field at offset 0x1c
pciback 0000:0b:00.3: added config field at offset 0x20
pciback 0000:0b:00.3: added config field at offset 0x24
pciback 0000:0b:00.3: added config field at offset 0x30

pciback 0000:0b:00.3: Found capability 0x1 at 0x80

pciback 0000:0b:00.3: added config field at offset 0x80
pciback 0000:0b:00.3: added config field at offset 0x82
------------>     0x80 + 4 missing here    <------ 
pciback 0000:0b:00.3: added config field at offset 0x86
pciback 0000:0b:00.3: added config field at offset 0x87


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