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Message-ID: <20100209173552.GB7289@us.ibm.com> Date: Tue, 9 Feb 2010 09:35:52 -0800 From: Gary Hade <garyhade@...ibm.com> To: Gary Hade <garyhade@...ibm.com> Cc: "Rafael J. Wysocki" <rjw@...k.pl>, linux-pm@...ts.linux-foundation.org, Linux PCI <linux-pci@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, Jesse Barnes <jbarnes@...tuousgeek.org>, "Moore, Robert" <robert.moore@...el.com>, Matthew Garrett <mjg@...hat.com> Subject: Re: [linux-pm] [PATCH 8/9] PCI / ACPI / PM: Platform support for PCI PME wake-up (rev. 7) On Tue, Feb 09, 2010 at 08:41:16AM -0800, Gary Hade wrote: > On Tue, Feb 09, 2010 at 01:48:20PM +0100, Rafael J. Wysocki wrote: > > On Tuesday 09 February 2010, Gary Hade wrote: > > > On Mon, Feb 08, 2010 at 03:37:08PM -0800, Gary Hade wrote: > > > > On Mon, Feb 08, 2010 at 10:30:30PM +0100, Rafael J. Wysocki wrote: > > > > > On Monday 08 February 2010, Rafael J. Wysocki wrote: > > > > > > On Monday 08 February 2010, Gary Hade wrote: > > > > > > > On Sat, Feb 06, 2010 at 09:11:56PM +0100, Rafael J. Wysocki wrote: > > > > > > > > On Saturday 06 February 2010, Bjorn Helgaas wrote: > > > > > > > > > On Sunday 10 January 2010 07:01:03 am Rafael J. Wysocki wrote: > > > > > > > > > > From: Rafael J. Wysocki <rjw@...k.pl> > > > > > > > > > > > > > > > > > > > > Although the majority of PCI devices can generate PMEs that in > > > > > > > > > > principle may be used to wake up devices suspended at run time, > > > > > > > > > > platform support is generally necessary to convert PMEs into wake-up > > > > > > > > > > events that can be delivered to the kernel. If ACPI is used for this > > > > > > > > > > purpose, a PME generated by a PCI device will trigger the ACPI GPE > > > > > > > > > > associated with the device to generate an ACPI wake-up event that we > > > > > > > > > > can set up a handler for, provided that everything is configured > > > > > > > > > > correctly. > > > > > > > > > > > > > > > > > > I think acpiphp needs a little attention after this patch. Gary > > > > > > > > > Hade noticed while testing Jesse's linux-next branch that acpiphp > > > > > > > > > complains like this: > > > > > > > > > > > > > > > > > > acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 > > > > > > > > > acpiphp: Slot [9] registered > > > > > > > > > acpiphp: Slot [10] registered > > > > > > > > > acpiphp_glue: failed to register interrupt notify handler > > > > > > > > > acpiphp: Slot [6] registered > > > > > > > > > acpiphp_glue: failed to register interrupt notify handler > > > > > > > > > > > > > > > > > > I reproduced this on an HP rx3600 (ia64), and found that acpiphp > > > > > > > > > doesn't complain on commit 82533a617f453, but it *does* complain > > > > > > > > > on commit fb3383bb4ac6e, which seems to be this patch. > > > > > > > > > > > > > > > > I can't see the possible reason looking at the code alone. > > > > > > > > > > > > > > > > Could you add a debug printk() printing the error code returned by > > > > > > > > pci_acpi_add_hp_notifier() in acpiphp_glue.c:register_slot(), please? > > > > > > > > > > > > > > Rafael, On the system where I ran into the problem it returns > > > > > > > AE_NOT_FOUND. See below. > > > > > > > > > > > > Thanks! > > > > > > > > > > > > Well, that means there's no struct acpi_device object associated with handle. > > > > > > > > > > > > I must admit I didn't take that into consideration, but it should be easily > > > > > > fixable. I'll send a patch for that later today. > > > > > > > > > > Patch appended. > > > > > > > > > > If the theory is correct, it should fix the issue. Please test. > > > > > > > > Well, acpiphp now loads OK with no disturbing messages: > > > > [ 247.360878] pci_hotplug: PCI Hot Plug PCI Core version: 0.5 > > > > [ 247.385048] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 > > > > [ 247.385459] acpiphp_glue: found PCI host-bus bridge with hot-pluggable slots > > > > [ 247.385486] acpiphp_glue: found ACPI PCI Hotplug slot 1 at PCI 0000:02:01 > > > > [ 247.385519] acpiphp: Slot [1] registered > > > > [ 247.386167] acpiphp_glue: found PCI host-bus bridge with hot-pluggable slots > > > > [ 247.386196] acpiphp_glue: found ACPI PCI Hotplug slot 2 at PCI 0000:06:01 > > > > [ 247.386225] acpiphp: Slot [2] registered > > > > [ 247.386828] acpiphp_glue: found PCI-to-PCI bridge at PCI 0000:0a:00.0 > > > > [ 247.386861] acpiphp_glue: found ACPI PCI Hotplug slot 3 at PCI 0000:0b:00 > > > > [ 247.386902] acpiphp: Slot [3] registered > > > > [ 247.387564] acpiphp_glue: found PCI-to-PCI bridge at PCI 0000:0f:00.0 > > > > [ 247.387597] acpiphp_glue: found ACPI PCI Hotplug slot 4 at PCI 0000:10:00 > > > > [ 247.387620] acpiphp: Slot [4] registered > > > > [ 247.388293] acpiphp_glue: found PCI-to-PCI bridge at PCI 0000:14:00.0 > > > > [ 247.388324] acpiphp_glue: found ACPI PCI Hotplug slot 5 at PCI 0000:15:00 > > > > [ 247.388347] acpiphp: Slot [5] registered > > > > [ 247.389041] acpiphp_glue: found PCI-to-PCI bridge at PCI 0000:19:00.0 > > > > [ 247.389077] acpiphp_glue: found ACPI PCI Hotplug slot 6 at PCI 0000:1a:00 > > > > [ 247.389114] acpiphp: Slot [6] registered > > > > [ 247.389736] acpiphp_glue: Bus 0000:1a has 1 slot > > > > [ 247.389739] acpiphp_glue: Bus 0000:15 has 1 slot > > > > [ 247.389742] acpiphp_glue: Bus 0000:10 has 1 slot > > > > [ 247.389746] acpiphp_glue: Bus 0000:0b has 1 slot > > > > [ 247.389748] acpiphp_glue: Bus 0000:06 has 1 slot > > > > [ 247.389751] acpiphp_glue: Bus 0000:02 has 1 slot > > > > [ 247.389753] acpiphp_glue: Total 6 slots > > > > > > > > However, I didn't have a chance to confirm that hot-add of a > > > > PCI card works correctly before someone else swiped the system > > > > from me for a while. I will verify this when I get it back, > > > > hopefully later today. > > > > > > I got the system back but unfortunately have some bad news. > > > The system has 2 hotpluggable PCI-X slots and 4 hotpluggable > > > PCIe slots. I tried hot-adding both a PCI-X card and a PCIe > > > card but acpiphp did not seem to see the hot-add event for > > > either card. acpiphp was loaded with debug=1 and issued no > > > messages when I added the cards. > > > > I gather it works without the $subject patch? > > I don't know for sure. Late Friday after running into the handler > registration issue I reverted 8/9 which required hand fixup for > one hunk failure. I then got some compile errors which I assumed > may be related to my non-removal of some of the other patches in the > series. I started reverting the entire series but got a failure right > away with 9/9 but didn't take the time to try to resolve it. > > Since it sounds like you are doubtful that your changes are > responsible for this new issue I will try to make time to fuss > with this more today. Rafael, I think I can approach this from a different direction. Except for a trivial failure with 9/9, the entire series applies to 2.6.33-rc7. I will try hot-add with 2.6.33-rc7 with and without your patches and let you know what happens. Gary -- Gary Hade System x Enablement IBM Linux Technology Center 503-578-4503 IBM T/L: 775-4503 garyhade@...ibm.com http://www.ibm.com/linux/ltc -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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