Re: State of the Linux PCI and PCI Hotplug Subsystems for 2.6.16-rc5

[Kenji Kaneshige]

Greg KH wrote:
> Here's a summary of the current state of the Linux PCI and PCI Hotplug
> subsystems as of 2.6.16-rc5
>
> If the information in here is incorrect, or anyone knows of any
> outstanding issues not listed here, please let me know.
>
> List of outstanding regressions from 2.6.15:
> 	- none known.
>
> List of outstanding regressions from older kernel versions:
> 	- some cardbus users still have issues with the change to the
> 	  PCI resource allocation stuff.
> 	  http://bugzilla.kernel.org/show_bug.cgi?id=5736 shows this
> 	  issue, but seems to be stalled for now :(
>
> Here is a list of the current outstanding bugs for the PCI subsystem as
> tracked at bugzilla.kernel.org.  If anyone can help out with any of
> these, please add information to the bug reports.
>
>  * 5736 [greg@xxxxxxxxx] - pci broken on PIIX/ICH laptop (CARDBUS_IO_SIZE
> 	too small?).
>
>
> Future stuff:
>   Wow, for a subsystem that no one cared about for a long time (PCI
>   Hotplug) all of a sudden we have so many patches floating around that
>   it is difficult to handle all of them.  If you are interested in the
>   changes in this area that will be coming in 2.6.17, please see my
>   quilt tree at
>   http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/
>
>   Summary of the changes found there are:
> 	- shpchp driver reworks that fix issues and handle the module
> 	  being able to be unloaded properly
> 	- acpiphp driver changes to try to be able to work properly for
> 	  laptop docking stations.  There is still remaining work to do
> 	  in this area.
> 	- We have unstable patches to handle multi-domain PCI busses for
> 	  i386 and x86 arches in this tree.  Unfortunately they still
> 	  seem to break NUMA and other random boxes, so they will not be
> 	  heading for mainline any time soon.  If anyone has one of
> 	  these boxes and wishes to work on this, please let me know.
> 	- MSI cleanups and fixes to get things to work on ia64.
> 	- Other minor PCI and PCI bug fixes.
>
>
> I still have a few outstanding patches in my TODO queue that I have not
> applied to my quilt tree.  These patches do the following:
> 	- boot parameter to disable MSI
> 	- various PCI quirks added
> 	- remove PCI_LEGACY_PROC functionality.
> 	- more acpiphp driver fixes.
> 	- kzalloc cleanup for drivers/pci
> 	- cpqphp driver cleanups as found by the Coverty checker.
> 	- other minor things.
>
> I hope to get to these by the end of the week, depending on other 2.6.16
> stabilization work.  If you don't hear back from me by then, and you
> have sent me a PCI or PCI Hotplug patch, please resend it and poke me
> about it.
>
> There are no new PCI driver API changes are pending that I am aware of.
>
> Was this summary useful for people?  Anything that I should add to it?

Could you please add "PCI legacy I/O port free driver"
(http://www.ussg.iu.edu/hypermail/linux/kernel/0603.0/1923.html)
to Future stuff? I hope the set of patches would be tested on -mm tree
for a while.

Thanks,
Kenji Kaneshige

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