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Date: Fri, 4 Apr 2008 01:13:10 +0100 From: "Maciej Żenczykowski" <maze@....uj.edu.pl> To: linux-kernel@...r.kernel.org Subject: Re: Suspending and resuming a single PCI device (and bridge) I've got a wireless card (atheros 5418 on a MacBookPro3,1) which is (kind-of) supported by the madwifi driver (from head), however occasionally it gets stuck (long outstanding bug with lots of comments, but no fixes) - I've noticed that a suspend to ram and resume (almost?) always fixes the problem. Thus, I'm wondering if there is a way to cause a pci device (and possibly the pci bridge/port it's connected to) to suspend/resume manually (or naturally, any other solution to the problem)... The hardware in question: # lspci -t | egrep 0b; lspci -vvnn -s 00:1c.4; lspci -vvnn -s 0b:00.0 +-1c.4-[0000:0b]----00.0 00:1c.4 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 [8086:2847] (rev 03) (prog-if 00 [Normal decode]) 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: 256 bytes Bus: primary=00, secondary=0b, subordinate=0b, sec-latency=0 Memory behind bridge: d7300000-d73fffff Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR- BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: [40] Express (v1) Root Port (Slot+), MSI 00 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited ExtTag- RBE+ FLReset- DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop- MaxPayload 128 bytes, MaxReadReq 128 bytes DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend- LnkCap: Port #5, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <256ns, L1 <4us ClockPM- Suprise- LLActRep+ BwNot- LnkCtl: ASPM L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive+ BWMgmt- ABWMgmt- SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surpise+ Slot # 4, PowerLimit 6.500000; Interlock- NoCompl- SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg- Control: AttnInd Unknown, PwrInd Unknown, Power- Interlock- SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock- Changed: MRL- PresDet+ LinkState+ RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible- RootCap: CRSVisible- RootSta: PME ReqID 0000, PMEStatus- PMEPending- Capabilities: [80] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable- Address: fee0300c Data: 4179 Capabilities: [90] Subsystem: Gammagraphx, Inc. Unknown device [0000:0000] Capabilities: [a0] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: pcieport-driver Kernel modules: shpchp 0b:00.0 Network controller [0280]: Atheros Communications, Inc. AR5418 802.11abgn Wireless PCI Express Adapter [168c:0024] (rev 01) Subsystem: Apple Computer Inc. Unknown device [106b:0087] 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: 256 bytes Interrupt: pin A routed to IRQ 16 Region 0: Memory at d7300000 (64-bit, non-prefetchable) [size=64K] Capabilities: [40] Power Management version 2 Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA PME(D0+,D1+,D2-,D3hot+,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Capabilities: [50] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable- Address: 00000000 Data: 0000 Capabilities: [60] Express (v1) Legacy Endpoint, MSI 00 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us ExtTag- AttnBtn- AttnInd- PwrInd- RBE- FLReset- DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop- MaxPayload 128 bytes, MaxReadReq 512 bytes DevSta: CorrErr- UncorrErr+ FatalErr- UnsuppReq+ AuxPwr- TransPend- LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <512ns, L1 <64us ClockPM- Suprise- LLActRep- BwNot- LnkCtl: ASPM L1 Enabled; RCB 128 bytes Disabled- Retrain- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- Capabilities: [90] MSI-X: Enable- Mask- TabSize=1 Vector table: BAR=0 offset=00000000 PBA: BAR=0 offset=00000000 Kernel driver in use: ath_pci Kernel modules: ath5k, ath_pci When the problem happens, the kernel driver reports: kernel: wifi0: ath_rxorn_tasklet: Receive FIFO overrun; resetting. kernel:last message repeated 92 times I've noticed this seems to be correlated to <MAbort+ being asserted on the pci port (00:1c.4) and on the device itself (0b:00.0) - thus I think the above message is more of a symptom, than an actual problem... Does anyone have any ideas (for example how [else] to clear MAbort)? This is on kernel 2.6.24.4-74.fc8 from koji for fedora core 8 (also present on 2.6.24.3-*.fc8), but people have reported issues on pretty much everything (ubuntu, etc), any desired futher information available by request... Not currently subscribed so please keep me CC'ed. Thanks, Maciej -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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