fake hotplug questions

fake hotplug questions

[David Clemmer]

Hi all,

I was looking at the fakephp code, and noted that it just refuses to touch
a bridge.  I was wondering if this is because of not wanting to handle
recursively disabling devices behind the bridge, or not having code
available to re-enable them afterwards, or something else I didn't think
of.  (I'm asking because I'd like to fake replugging a bridge.)

I also have a couple of specific questions.  Is there a better way to find
which hotplug_slot is associated with a (pci_dev*) device than walking the
dummy slot list, and looking for one with a matching dev field?  Also, when
re-enabling a device, I'm assuming that storing the hotplug_slot object
(and a copy of the pci_dev object) would be needed, probably along with
something indicative of which bus something was attached to (and,
presumably, a copy of the pci_bus object, for bridges).

The problem I'm having now is that I have a number of cardbus bridges, most
of which are behind a pci2pci bridge.  The ones in front I got working by
setting the p2cclk flag on (per suggestion of David Hinds), and by
disabling IRQs 10 and 11 in the BIOS (there was an IRQ routing conflict
between 9 & 11).  The ones behind the p2p bridge, on the other hand,
recognize very few cards, and don't do anything with the ones that do get
recognized (they never show up with correct info in cardctl ident, and
nothing shows up via lspci).

The one specific sign of a problem that I have is that both the secondary
and subordinate numbers for the p2p bridge show up as 2.  This doesn't
prevent the cardbus bridges behind from being (apparently) correctly
configured (memory, port, and bridge allocations all appear ok).  I've
tried manually changing the subordinate byte to be the same as the
highest-numbered subordinate of the cb bridges, but that didn't accomplish
anything.

Anyway, if anyone has any ideas, I'm all ears.  Thanks,

Dave Clemmer



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Re: fake hotplug questions

[Greg KH]

On Mon, May 03, 2004 at 09:51:52AM -0400, David Clemmer wrote:
> 
> 
> 
> 
> Hi all,
> 
> I was looking at the fakephp code, and noted that it just refuses to touch
> a bridge.

Yes, it only handles PCI devices.

> I was wondering if this is because of not wanting to handle
> recursively disabling devices behind the bridge, or not having code
> available to re-enable them afterwards, or something else I didn't think
> of.  (I'm asking because I'd like to fake replugging a bridge.)

It's just because I didn't think of doing that function in the driver.
If you have patches to fix this, I'll gladly take a look at them.

> I also have a couple of specific questions.  Is there a better way to find
> which hotplug_slot is associated with a (pci_dev*) device than walking the
> dummy slot list, and looking for one with a matching dev field?

Not really, sorry.

> Also, when re-enabling a device, I'm assuming that storing the
> hotplug_slot object (and a copy of the pci_dev object) would be
> needed, probably along with something indicative of which bus
> something was attached to (and, presumably, a copy of the pci_bus
> object, for bridges).

How about just rescanning all of the pci busses to see if any devices
are there that aren't in our list anymore?  That would allow machines
that can add PCI devices without pci hotplug controller to work better.

Sorry for the delay in answering this.

greg k-h


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