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SubjectRe: Suspending and resuming a single PCI device (and bridge)
On Fri, 4 Apr 2008, Justin Mattock wrote:

> Hello; I noticed this with the macbook pro ati chipset as well(FIFO
> thing), you probably read somewhere but if you didn't try
> iwpriv ath0 bgscan 0, and put that in /etc/rc.local for starting up.
> hope this solves the problem with ath0, also I notice with 2.6.25-rc1

Ok, I hadn't tried this before - because it didn't work - figured out the
problem was an x86_64 kernel with i386 wireless-tools utilities (so
reinstalled the 64-bit utilities).
Now, it works, we'll see if it helps.

> this happend quite a bit with the new madwifi, but using
> madwifi-dfs-r3221-20080119 seems to not produce that kind of problem.
> Hopefully this helps you out. (if this problem is more than above then
> hopefully somebody else has the answer for you.)
> regards;
> Justin P. Mattock
>

I've been using madwifi-3421 (and various other versions before that) on
an smp 64-bit kernel.

I'm assuming the -dfs shouldn't affect this? Anyway, if the bgscan
doesn't help I'll try the specific version you pointed out.

Thanks,
Maciej

> On Fri, Apr 4, 2008 at 12:13 AM, Maciej Żenczykowski <maze@tcs.uj.edu.pl> wrote:
>> 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
>> --
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>
>
>
> --
> Justin P. Mattock
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