linux-kernel - Re: [PATCH 0/2] Re: 2.6.38 regression caused by commit 415e12b

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Date:	Fri, 4 Mar 2011 21:32:35 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc:	linux-usb@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ozan Caglayan <ozan@...dus.org.tr>
Subject: Re: [PATCH 0/2] Re: 2.6.38 regression caused by commit 415e12b

On Friday, March 04, 2011, Sarah Sharp wrote:
> On Wed, Mar 02, 2011 at 11:30:49PM +0100, Rafael J. Wysocki wrote:
> > On Wednesday, March 02, 2011, Rafael J. Wysocki wrote:
> > > There are two problems.  First, your BIOS says that ASPM is not supported
> > > by it, so we don't call _OSC, which should be fixed by the previous patch.
> > > Second, pci_msi_enabled() returns 0 on your system, which is kind of strange,
> > > because it evidently uses MSIs (as visible in the dmesg).
> > > 
> > > While I think we can safely request _OSC control even if ASPM is not supported
> > > by the hardware (according to the BIOS), which is done after the first patch,
> > > we need to figure out why 0 is returned by pci_msi_enabled() on your system
> > > and try to work around that.
> > 
> > Regardless, I think we should report MSI and ASPM support to the BIOS unless
> > directly disabled via the kernel command line or .config.
> > 
> > I'm going to send two patches in replies to this message.  Please apply them
> > both on top of 2.6.38-rc7 and report back.
> 
> I applied your patches on top of 2.6.38-rc6 again and tested them.
> dmesg is attached.  Let me know if you need me to test Linus' latest
> instead.

-rc6 should be fine.

I don't understand why pci_no_msi_support() is called on your system even
though pci=nomsi is not in the kernel command line.

Please apply this patch on top of the previous two and send me dmesg.

---
 drivers/pci/msi.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6/drivers/pci/msi.c
===================================================================
--- linux-2.6.orig/drivers/pci/msi.c
+++ linux-2.6/drivers/pci/msi.c
@@ -858,6 +858,8 @@ void pci_no_msi(void)
 
 void pci_no_msi_support(void)
 {
+	dump_stack();
+
 	msi_support_enabled = false;
 	pci_no_msi();
 }
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