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Message-ID: <CADaLNDkOLiyPmVC3VwpnbrfAKFmNwSVJKdChjQFdQqs7XP-Ddg@mail.gmail.com> Date: Tue, 28 Jul 2015 14:50:39 -0700 From: Duc Dang <dhdang@....com> To: Bjorn Helgaas <bhelgaas@...gle.com> Cc: Tanmay Inamdar <tinamdar@....com>, "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>, linux-arm <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: X-Gene: Unhandled fault: synchronous external abort in pci_generic_config_read32 On Tue, Jul 28, 2015 at 2:29 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote: > On Tue, Jul 28, 2015 at 10:45:26AM -0700, Duc Dang wrote: >> On Tue, Jul 28, 2015 at 9:43 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote: >> > On Fri, Jul 24, 2015 at 7:05 PM, Duc Dang <dhdang@....com> wrote: >> >> Hi Bjorn, >> >> >> >> On Fri, Jul 24, 2015 at 3:42 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote: >> >>> >> >>> I regularly see faults like this on an APM X-Gene: >> >>> >> >>> U-Boot 2013.04-mustang_sw_1.14.14 (Dec 16 2014 - 15:59:33) >> >>> CPU0: APM ARM 64-bit Potenza Rev B0 2400MHz PCP 2400MHz >> >>> 32 KB ICACHE, 32 KB DCACHE >> >>> SOC 2000MHz IOBAXI 400MHz AXI 250MHz AHB 200MHz GFC 125MHz >> >>> ... >> >>> Unhandled fault: synchronous external abort (0x96000010) at 0xffffff8000110034 >> >>> Internal error: : 96000010 [#1] SMP >> >>> Modules linked in: >> >>> CPU: 0 PID: 3723 Comm: ... 4.1.0-smp-DEV #3 >> >>> Hardware name: APM X-Gene Mustang board (DT) >> >>> task: ffffffc7dc1a4140 ti: ffffffc7dc118000 task.ti: ffffffc7dc118000 >> >>> PC is at pci_generic_config_read32+0x4c/0xb8 >> >>> LR is at pci_generic_config_read32+0x40/0xb8 >> >>> pc : [<ffffffc00033b90c>] lr : [<ffffffc00033b900>] pstate: 600001c5 >> >>> ... >> >>> Call trace: >> >>> [<ffffffc00033b90c>] pci_generic_config_read32+0x4c/0xb8 >> >>> [<ffffffc00033bf58>] pci_user_read_config_byte+0x60/0xc4 >> >>> [<ffffffc0003496a8>] pci_read_config+0x15c/0x238 >> >>> [<ffffffc0002393b4>] sysfs_kf_bin_read+0x68/0xa0 >> >>> [<ffffffc00023896c>] kernfs_fop_read+0x9c/0x1ac >> >>> [<ffffffc0001c361c>] __vfs_read+0x44/0x128 >> >>> [<ffffffc0001c3e28>] vfs_read+0x84/0x144 >> >>> [<ffffffc0001c4764>] SyS_read+0x50/0xb0 >> >> >> >> The log shows kernel gets an exception when trying to access Mellanox >> >> card configuration space. This is usually due to suboptimal PCIe >> >> SerDes parameters are using in your board, which will cause bad link >> >> quality. >> >> The PCIe SerDes programming is done in U-Boot, so I suggest you do a >> >> U-Boot upgrade to our latest X-Gene U-Boot release. >> > >> > I installed U-Boot 1.15.12, which I thought was the latest. I'm still >> > seeing this issue regularly, approx once/hour. >> >> Our latest U-Boot is 1.15.15, but U-Boot 1.15.12 is already a good >> version to use. Are you running any PCIe traffic test when the error >> happens? > > Nope, the machine was either idle or running a reboot test; no PCIe stress > test or anything. > >> And it will be useful if you can share your "lspci -vvv" output when >> the board is running, we can check to see if there is any error status >> reported. > > Here's some lspci output and info about the firmware I'm running. > Obviously this lspci output was collected before a crash. I have also > seen lspci output where "CESta: RxErr+" was set on the 00:00.0 Root Port. > > U-Boot 2013.04-mustang_sw_1.15.12 (May 20 2015 - 10:03:33) > > CPU0: APM ARM 64-bit Potenza Rev B0 2400MHz PCP 2400MHz > 32 KB ICACHE, 32 KB DCACHE > SOC 2000MHz IOBAXI 400MHz AXI 250MHz AHB 200MHz GFC 125MHz > Boot from SPI-NOR > Slimpro FW: > Ver: 2.4 (build 01.15.12.00 2015/05/20) > PMD: 970 mV > SOC: 950 mV > Board: Mustang - AppliedMicro APM883208-xNA24SPT Reference Board > I2C: ready > DRAM: ECC 32 GiB @ 1600MHz > SF: Detected N25Q256 with page size 256 Bytes, total 32 MiB > MMC: X-Gene SD/SDIO/eMMC: 0 > PCIE0: (RC) X8 GEN-3 link up > 00:00.0 - 10e8:e004 - Bridge device > 01:00.0 - 15b3:1007 - Network controller > > # lspci -vvv > 00:00.0 PCI bridge: Applied Micro Circuits Corp. Device e004 (rev 04) (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 > Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 > I/O behind bridge: 0000f000-00000fff > Memory behind bridge: 80000000-82ffffff > Prefetchable memory behind bridge: 0000000083000000-00000000830fffff > 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 (v2) Root Port (Slot+), MSI 00 > DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <1us, L1 unlimited > ExtTag- RBE+ FLReset- > DevCtl: Report errors: Correctable- Non-Fatal+ Fatal+ Unsupported- > RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+ > MaxPayload 256 bytes, MaxReadReq 512 bytes > DevSta: CorrErr+ UncorrErr- FatalErr+ UnsuppReq- AuxPwr- TransPend+ > LnkCap: Port #0, Speed unknown, Width x8, ASPM L0s L1, Latency L0 unlimited, L1 unlimited > ClockPM- Surprise+ LLActRep+ BwNot+ > LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+ > ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > LnkSta: Speed unknown, Width x8, TrErr- Train- SlotClk+ DLActive+ BWMgmt+ ABWMgmt- > SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug- Surprise- > Slot #1, PowerLimit 10.000W; Interlock- NoCompl- > SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg- > Control: AttnInd Off, PwrInd Off, 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- > DevCap2: Completion Timeout: Not Supported, TimeoutDis+ ARIFwd- > DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- ARIFwd- > LnkCtl2: Target Link Speed: Unknown, EnterCompliance- SpeedDis-, Selectable De-emphasis: -3.5dB Target Link Speed unknown is really strange. I also saw the same "Link speed unknown" for Mellanox card below. > Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS- > Compliance De-emphasis: -6dB > LnkSta2: Current De-emphasis Level: -6dB > Capabilities: [80] Power Management version 3 > Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) > Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [100 v1] Advanced Error Reporting > UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- > UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- > UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol- > CESta: RxErr+ BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr- > CEMsk: RxErr+ BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ > AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn- > Capabilities: [180 v1] #19 > Capabilities: [150 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> > Kernel driver in use: pcieport > > 01:00.0 Ethernet controller: Mellanox Technologies MT27520 Family > Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Mem and BusMaster are disabled. So this card is not functional? > Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- > Interrupt: pin A routed to IRQ 226 > Region 0: [virtual] Memory at e182000000 (32-bit, non-prefetchable) [size=1M] > Region 2: [virtual] Memory at e180000000 (32-bit, non-prefetchable) [size=32M] > [virtual] Expansion ROM at e183000000 [disabled] [size=1M] > Capabilities: [40] Power Management version 3 > Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) > Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [9c] MSI-X: Enable- Count=64 Masked- This may be unrelated, but MSI allocation fails for this card somehow. > Vector table: BAR=0 offset=0007c000 > PBA: BAR=0 offset=0007d000 > Capabilities: [60] Express (v2) Endpoint, MSI 00 > DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, L1 unlimited > 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 #8, Speed unknown, Width x8, ASPM L0s, Latency L0 unlimited, L1 unlimited > ClockPM- Surprise- LLActRep- BwNot- > LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk- > ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > LnkSta: Speed unknown, Width x8, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- > DevCap2: Completion Timeout: Range ABCD, TimeoutDis+ > DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- > LnkCtl2: Target Link Speed: Unknown, EnterCompliance- SpeedDis-, Selectable De-emphasis: -6dB > Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS- > Compliance De-emphasis: -6dB > LnkSta2: Current De-emphasis Level: -6dB > Capabilities: [100 v1] Alternative Routing-ID Interpretation (ARI) > ARICap: MFVC- ACS-, Next Function: 0 > ARICtl: MFVC- ACS-, Function Group: 0 > Capabilities: [148 v1] Device Serial Number xx-xx-xx-xx-xx-xx-xx-xx The serial number here seems invalid. I have a Mellanox card but different model (ConnectX-3 15b3:1003) that shows meaningful serial number: Capabilities: [148 v1] Device Serial Number f4-52-14-03-00-0b-c2-30. Do you have another PCIe card to try on the same reboot test on this board? > Capabilities: [154 v2] Advanced Error Reporting > UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- > UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- > UESvrt: DLP+ SDES- TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol- > CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr- > CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ > AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn- > Capabilities: [18c v1] #19 > Kernel modules: mlx4_core -- Regards, Duc Dang. -- 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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