[linux-audio-user] A question on Interrupt Pin routing

Louis Lam lshoujun at yahoo.com
Wed Sep 22 13:56:17 EDT 2004
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Hello everyone,

Currently I have my soundcard on IRQ9. /proc/interrupt shows this:

           CPU0       
  0:     208542          XT-PIC  timer
  1:       3710          XT-PIC  keyboard
  2:          0          XT-PIC  cascade
  8:          4          XT-PIC  rtc
  9:    1458611          XT-PIC  Ensoniq AudioPCI
 10:       1446          XT-PIC  eth0
 12:      98030          XT-PIC  PS/2 Mouse
 14:      41633          XT-PIC  ide0
 15:        563          XT-PIC  ide1
NMI:          0 
LOC:     208492 
ERR:          0
MIS:          0 

When I inspected further using lspci, I noticed under "interrupts:" of the soundcard it says "pin
A routed to IRQ 9". There is another device, the SMBus Controller which has "Interrupt: pin B
routed to IRQ 9". Does it mean that this IRQ is still shared? What does pin A/pinB mean and if
they both route to the same interrupt, will it cause problems when recording?

Thanks For any clues or info regarding this,
Louis.


P.S The Full lspci output is as follow:

0000:00:00.0 Host bridge: Intel Corp. 82875P Memory Controller Hub (rev 02)
	Subsystem: Intel Corp. 82875P Memory Controller Hub
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR-
	Latency: 0
	Region 0: Memory at f8000000 (32-bit, prefetchable) [size=64M]
	Capabilities: [e4] #09 [2106]
	Capabilities: [a0] AGP version 3.0
		Status: RQ=32 Iso- ArqSz=2 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW+ AGP3- Rate=x1,x2,x4
		Command: RQ=1 ArqSz=0 Cal=2 SBA+ AGP+ GART64- 64bit- FW- Rate=<none>

0000:00:01.0 PCI bridge: Intel Corp. 82875P Processor to AGP Controller (rev 02) (prog-if 00
[Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 32
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
	I/O behind bridge: 0000f000-00000fff
	Memory behind bridge: fc900000-fe9fffff
	Prefetchable memory behind bridge: f0800000-f47fffff
	BridgeCtl: Parity- SERR- NoISA- VGA+ MAbort- >Reset- FastB2B-

0000:00:03.0 PCI bridge: Intel Corp. 82875P Processor to PCI to CSA Bridge (rev 02) (prog-if 00
[Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 32
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
	I/O behind bridge: 0000b000-0000bfff
	Memory behind bridge: fea00000-feafffff
	Prefetchable memory behind bridge: fff00000-000fffff
	BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-

0000:00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB/EB/ER Hub interface to PCI Bridge (rev c2)
(prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 0
	Bus: primary=00, secondary=03, subordinate=03, sec-latency=32
	I/O behind bridge: 0000c000-0000cfff
	Memory behind bridge: fff00000-000fffff
	Prefetchable memory behind bridge: fff00000-000fffff
	BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-

0000:00:1f.0 ISA bridge: Intel Corp. 82801EB/ER (ICH5/ICH5R) LPC Bridge (rev 02)
	Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 0

0000:00:1f.1 IDE interface: Intel Corp. 82801EB/ER (ICH5/ICH5R) Ultra ATA 100 Storage Controller
(rev 02) (prog-if 8a [Master SecP PriP])
	Subsystem: Intel Corp.: Unknown device 425a
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 0
	Interrupt: pin A routed to IRQ 10
	Region 0: I/O ports at <unassigned>
	Region 1: I/O ports at <unassigned>
	Region 2: I/O ports at <unassigned>
	Region 3: I/O ports at <unassigned>
	Region 4: I/O ports at ffa0 [size=16]
	Region 5: Memory at 3fe3f400 (32-bit, non-prefetchable) [size=1K]

0000:00:1f.2 IDE interface: Intel Corp. 82801EB (ICH5) Serial ATA 150 Storage Controller (rev 02)
(prog-if 8f [Master SecP SecO PriP PriO])
	Subsystem: Intel Corp.: Unknown device 425a
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 0
	Interrupt: pin A routed to IRQ 10
	Region 0: I/O ports at ec00 [size=8]
	Region 1: I/O ports at e800 [size=4]
	Region 2: I/O ports at e400 [size=8]
	Region 3: I/O ports at e000 [size=4]
	Region 4: I/O ports at dc00 [size=16]

0000:00:1f.3 SMBus: Intel Corp. 82801EB/ER (ICH5/ICH5R) SMBus Controller (rev 02)
	Subsystem: Intel Corp.: Unknown device 425a
	Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Interrupt: pin B routed to IRQ 9
	Region 4: I/O ports at d800 [size=32]

0000:01:00.0 VGA compatible controller: nVidia Corporation NV5M64 [RIVA TNT2 Model 64/Model 64
Pro] (rev 11) (prog-if 00 [VGA])
	Subsystem: CardExpert Technology: Unknown device 8888
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 32 (1250ns min, 250ns max)
	Interrupt: pin A routed to IRQ 11
	Region 0: Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at f2000000 (32-bit, prefetchable) [size=32M]
	Expansion ROM at fe9f0000 [disabled] [size=64K]
	Capabilities: [60] Power Management version 1
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [44] AGP version 2.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA- ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2,x4
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>

0000:02:01.0 Ethernet controller: Intel Corp. 82547EI Gigabit Ethernet Controller (LOM)
	Subsystem: Intel Corp.: Unknown device 3025
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 0 (63750ns min), Cache Line Size: 0x10 (64 bytes)
	Interrupt: pin A routed to IRQ 10
	Region 0: Memory at feae0000 (32-bit, non-prefetchable) [size=128K]
	Region 2: I/O ports at bc00 [size=32]
	Capabilities: [dc] Power Management version 2
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 PME-Enable- DSel=0 DScale=1 PME-

0000:03:02.0 Multimedia audio controller: Ensoniq ES1370 [AudioPCI]
	Subsystem: Unknown device 4942:4c4c
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort+ <MAbort+ >SERR- <PERR-
	Latency: 248 (3000ns min, 32000ns max)
	Interrupt: pin A routed to IRQ 9
	Region 0: I/O ports at cc00 [size=64]




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