linux-kernel - Re: [patch 00/47] Sparse irq rework

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Date:	Thu, 7 Oct 2010 06:01:31 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Yinghai Lu <yinghai@...nel.org>
cc:	Grant Likely <grant.likely@...retlab.ca>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [patch 00/47] Sparse irq rework

On Wed, 6 Oct 2010, Yinghai Lu wrote:

> On 10/06/2010 04:37 PM, Yinghai Lu wrote:
> > On 10/06/2010 03:52 PM, Thomas Gleixner wrote:
> >> On Wed, 6 Oct 2010, Yinghai Lu wrote:
> >>
> >>> On 10/05/2010 03:22 AM, Thomas Gleixner wrote:
> >>>> On Sun, 3 Oct 2010, Thomas Gleixner wrote:
> >>>>> On Sun, 3 Oct 2010, Grant Likely wrote:
> >>>>>> Okay, patch 14 looks good to me too (including Yinghai's comment).
> >>>>>> The new allocator seems sane, and I didn't see any obvious errors in
> >>>>>> patches 16-47.  I've not tested any of this yet.  Hopefully I'll be
> >>>>>> able to carve out some time to do so early this week.
> >>>>>
> >>>>> Wait until I pushed out a fixed tree. In meantime I found out how I
> >>>>> managed to screw up the quilt series :(
> >>>>>
> >>>>> Will post, once it's ready.
> >>>>
> >>>> Pushed out an updated tree to
> >>>>
> >>>>  git://git.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-sparse-irq.git master
> >>>>
> >>>
> >>> test it together with tip, it seems all io apic routing is not set rightly. MSI is ok...
> >>>
> >>> [  200.290040] ehci_hcd 0000:00:1d.7: PCI INT A -> GSI 23 (level, low) -> IRQ 23
> >>> [  200.290991] ehci_hcd 0000:00:1d.7: setting latency timer to 64
> >>> [  200.310002] ehci_hcd 0000:00:1d.7: EHCI Host Controller
> >>> [  200.310455] ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1
> >>> [  200.330127] ehci_hcd 0000:00:1d.7: debug port 1
> >>> [  200.334395] ehci_hcd 0000:00:1d.7: cache line size of 256 is not supported
> >>> [  200.350042] ehci_hcd 0000:00:1d.7: request interrupt 23 failed
> >>> [  200.350491] ehci_hcd 0000:00:1d.7: USB bus 1 deregistered
> >>> [  200.372257] ehci_hcd 0000:00:1d.7: PCI INT A disabled
> >>> [  200.372644] ehci_hcd 0000:00:1d.7: init 0000:00:1d.7 fail, -38
> >>> [  200.389916] ehci_hcd: probe of 0000:00:1d.7 failed with error -38
> >>
> >> Yep. Ingo's testing found that already. Does the patch below fix it ?
> >>
> >> Thanks,
> >>
> >> 	tglx
> >> ---
> >> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> >> index 2f171df..eb3d01d 100644
> >> --- a/arch/x86/kernel/apic/io_apic.c
> >> +++ b/arch/x86/kernel/apic/io_apic.c
> >> @@ -252,11 +252,15 @@ static struct irq_cfg *alloc_irq_and_cfg_at(unsigned int at, int node)
> >>  static struct irq_cfg *get_irq_cfg_at(unsigned int at, int node)
> >>  {
> >>  	int res = irq_alloc_desc_at(at, node);
> >> +	struct irq_data *data;
> >>  
> >>  	if (res < 0 && res != -EEXIST)
> >>  		return NULL;
> >>  
> >> -	return get_irq_chip_data(at);
> >> +	data = irq_get_irq_data(at);
> >> +	if (res >= 0 && !data->chip_data)
> >> +		data->chip_data = alloc_irq_cfg(at, node);
> >> +	return data->chip_data;
> >>  }
> >>  
> >>  static int alloc_irq_from(unsigned int from, int node)
> > 
> > yes, it fixes the problem.
> > 
> > but can you merge get_irq_cfg_at() and alloc_irq_and_cfg_at() ? 
> > it's confusing to let get_...() to do the alloc work.

Well, I'm not too happy about this preallocated stuff anyway, which is
the reason for the warning below.
 
> [   80.726176] WARNING: at drivers/pci/intr_remapping.c:67 irq_2_iommu_alloc+0x52/0xdc()
> [   80.745935] Hardware name: Sun Fire X4800
> [   80.746179] irq_2_iommu!=NULL irq 8

Thanks,

	tglx
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