linux-kernel - Re: non-printable characters in /proc/interrupts

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Message-Id: <20110610160541.21688a35.randy.dunlap@oracle.com>
Date:	Fri, 10 Jun 2011 16:05:41 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: non-printable characters in /proc/interrupts

On Sat, 11 Jun 2011 00:38:42 +0200 Toralf Förster wrote:

[adding Thomas]

> Randy Dunlap wrote at 18:11:32
> > On Fri, 10 Jun 2011 10:40:19 +0200 Toralf Förster wrote:
> > > I've wondering about this entry at my ThinkPad T400 (kernel 2.6.39.1):
> > > 
> > > n22 ~ # grep 47: /proc/interrupts
> > > 
> > >  47:      44041      69740   PCI-MSI-edge      l▒��@�E�
> > > 
> > > I attached the output of
> > > $>grep 47: /proc/interrupts > /tmp/int47
> > > onto this email, the complete table looks like this :
> > > 
> > > n22 ~ # cat /proc/interrupts
> > > 
> > >            CPU0       CPU1
> > >   
> > >   0:     605293      71393   IO-APIC-edge      timer
> > >   1:      13432          4   IO-APIC-edge      i8042
> > >   8:         55         64   IO-APIC-edge      rtc0
> > >   9:       6248        509   IO-APIC-fasteoi   acpi
> > >  
> > >  12:       1389         72   IO-APIC-edge      i8042
> > >  16:          0          0   IO-APIC-fasteoi   uhci_hcd:usb6
> > >  17:          0          0   IO-APIC-fasteoi   uhci_hcd:usb7
> > >  18:          0          0   IO-APIC-fasteoi   uhci_hcd:usb8
> > >  19:          0          0   IO-APIC-fasteoi   ehci_hcd:usb2
> > >  20:      52881          0   IO-APIC-fasteoi   uhci_hcd:usb3
> > >  21:        329         37   IO-APIC-fasteoi   uhci_hcd:usb4
> > >  22:          0          0   IO-APIC-fasteoi   uhci_hcd:usb5
> > >  23:      30046       8743   IO-APIC-fasteoi   ehci_hcd:usb1
> > >  40:          0          0   PCI-MSI-edge      PCIe PME
> > >  41:          0          0   PCI-MSI-edge      PCIe PME
> > >  42:          0          0   PCI-MSI-edge      PCIe PME
> > >  43:          0          0   PCI-MSI-edge      PCIe PME
> > >  44:     484163      55698   PCI-MSI-edge      ahci
> > >  45:        750       1809   PCI-MSI-edge      eth0
> > >  46:         94        213   PCI-MSI-edge      hda_intel
> > >  47:      44399      70713   PCI-MSI-edge      l▒��@�E�
> > >  48:      71969     102457   PCI-MSI-edge      iwlagn
> > > 
> > > NMI:          0          0   Non-maskable interrupts
> > > LOC:   10167789   10321319   Local timer interrupts
> > > SPU:          0          0   Spurious interrupts
> > > PMI:          0          0   Performance monitoring interrupts
> > > IWI:        213        200   IRQ work interrupts
> > > RES:     289390     333102   Rescheduling interrupts
> > > CAL:       4677       4542   Function call interrupts
> > > TLB:      22261      16007   TLB shootdowns
> > > TRM:          0          0   Thermal event interrupts
> > > THR:          0          0   Threshold APIC interrupts
> > > MCE:          0          0   Machine check exceptions
> > > MCP:         41         41   Machine check polls
> > > ERR:          0
> > > MIS:          0
> > 
> > Is there any other info (like dmesg or boot log) that tells what
> > device/driver uses interrupt 47 ?
> 
> 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio 
> Controller (rev 03)
>         Subsystem: Lenovo Device 20f2
>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR+ FastB2B- DisINTx+
>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- 
> <TAbort- <MAbort- >SERR- <PERR- INTx-
>         Latency: 0, Cache Line Size: 64 bytes
>         Interrupt: pin B routed to IRQ 47
>         Region 0: Memory at fc020000 (64-bit, non-prefetchable) [size=16K]
>         Capabilities: <access denied>
>         Kernel driver in use: HDA Intel
>         Kernel modules: snd-hda-intel
> 
> I attached the dmesg output
> 
> -- 

So for you lspci, IRQ 47 is HD Audio,
but in the dmesg.txt file, we can see:

iwlagn 0000:03:00.0: irq 46 for MSI/MSI-X	// iwlagn uses irq 48 above
HDA Intel 0000:00:1b.0: irq 47 for MSI/MSI-X	// HDA Intel uses irq 46 above
i915 0000:00:02.0: irq 48 for MSI/MSI-X		// i915 uses what irq above?  maybe 47?

Hopefully Thomas can see something here.

---
~Randy
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