linux-kernel - Re: [Bugfix v4 1/2] xen/pci: Fix xen IRQ allocation failure caused by commit b81975eade8c

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Message-ID: <20150120191242.GC13409@l.oracle.com>
Date:	Tue, 20 Jan 2015 14:12:42 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Sander Eikelenboom <linux@...elenboom.it>,
	David Vrabel <david.vrabel@...rix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, xen-devel@...ts.xenproject.org,
	linux-pci@...r.kernel.org
Subject: Re: [Bugfix v4 1/2] xen/pci: Fix xen IRQ allocation failure caused
 by commit b81975eade8c

On Mon, Jan 19, 2015 at 12:41:24PM +0800, Jiang Liu wrote:
> 
> On 2015/1/17 2:13, Konrad Rzeszutek Wilk wrote:
> > On Thu, Jan 15, 2015 at 09:04:35PM +0800, Jiang Liu wrote:
> <snit>
> >>
> >> Note: we need to test this patch on those special AMD systems which
> >> override normal SCI GSI (9) with strange GSI (20).
> > 
> > [    0.000000] DMI: Supermicro X8DTN/X8DTN, BIOS 2.1c       10/28/2011
> > ..
> >      0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
> > [    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
> > [    0.000000] ACPI: IRQ0 used by override.
> > ..
> >     6.358737] xen: registering gsi 20 triggering 0 polarity 1
> > [    6.358756] xen: --> pirq=20 -> irq=20 (gsi=20)
> > ...
> > -bash-4.1# cat /proc/interrupts |grep acpi
> >  20:          0          0          0  xen-pirq-ioapic-level  acpi
> Hi Konrad,

> 	May I assume an Tested-by from you here?

Yes for this particular use case. I hadn't yet tried to push the ACPI buttons
(this printout was from an server in a basement).
> Thanks!
> Gerry
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