On Fri, May 17, 2019 at 11:23:36PM +0530, Vidya Sagar wrote: > On 5/17/2019 6:54 PM, Bjorn Helgaas wrote: > > Do you have "lspci -vvxxx" output for the root ports handy? > > > > If there's some clue in the standard config space that would tell us > > that MSI works for some events but not others, we could make the PCI > > core pay attention it. That would be the best solution because it > > wouldn't require Tegra-specific code. > > Here is the output of 'lspci vvxxx' for one of Tegra194's root ports.
Thanks! This port advertises both MSI and MSI-X, and neither one is enabled. This particular port doesn't have a slot, so hotplug isn't applicable to it. But if I understand correctly, if MSI or MSI-X were enabled and the port had a slot, the port would generate MSI/MSI-X hotplug interrupts. But PME and AER events would still cause INTx interrupts (even with MSI or MSI-X enabled). Do I have that right? I just want to make sure that the reason for PME being INTx is a permanent hardware choice and that it's not related to MSI and MSI-X currently being disabled. > 0005:00:00.0 PCI bridge: NVIDIA Corporation Device 1ad0 (rev a1) (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 > Interrupt: pin A routed to IRQ 50 > Bus: primary=00, secondary=01, subordinate=ff, sec-latency=0 > I/O behind bridge: None > Memory behind bridge: 40000000-400fffff [size=1M] > Prefetchable memory behind bridge: None > Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- > <MAbort- <SERR- <PERR- > BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16- MAbort- >Reset- FastB2B- > PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- > Capabilities: [40] Power Management version 3 > Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA > PME(D0+,D1-,D2-,D3hot+,D3cold+) > Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+ > Address: 0000000000000000 Data: 0000 > Masking: 00000000 Pending: 00000000 > Capabilities: [70] Express (v2) Root Port (Slot-), MSI 00 > DevCap: MaxPayload 256 bytes, PhantFunc 0 > ExtTag- RBE+ > DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq+ > RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+ > MaxPayload 128 bytes, MaxReadReq 512 bytes > DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr+ > TransPend- > LnkCap: Port #0, Speed 16GT/s, Width x8, ASPM L0s L1, Exit > Latency L0s <1us, L1 <64us > ClockPM- Surprise+ LLActRep+ BwNot+ ASPMOptComp+ > LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+ > ExtSynch- ClockPM- AutWidDis- BWInt+ AutBWInt- > LnkSta: Speed 5GT/s (downgraded), Width x1 (downgraded) > TrErr- Train- SlotClk+ DLActive+ BWMgmt+ ABWMgmt+ > RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna+ > CRSVisible+ > RootCap: CRSVisible+ > RootSta: PME ReqID 0000, PMEStatus- PMEPending- > DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, LTR+, > OBFF Not Supported ARIFwd- > AtomicOpsCap: Routing- 32bit- 64bit- 128bitCAS- > DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, > OBFF Disabled ARIFwd- > AtomicOpsCtl: ReqEn- EgressBlck- > LnkCtl2: Target Link Speed: 16GT/s, EnterCompliance- SpeedDis- > Transmit Margin: Normal Operating Range, > EnterModifiedCompliance- ComplianceSOS- > Compliance De-emphasis: -6dB > LnkSta2: Current De-emphasis Level: -6dB, > EqualizationComplete-, EqualizationPhase1- > EqualizationPhase2-, EqualizationPhase3-, > LinkEqualizationRequest- > Capabilities: [b0] MSI-X: Enable- Count=8 Masked- > Vector table: BAR=2 offset=00000000 > PBA: BAR=2 offset=00010000 > Capabilities: [100 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- > AdvNonFatalErr- > CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- > AdvNonFatalErr+ > AERCap: First Error Pointer: 00, ECRCGenCap+ ECRCGenEn- > ECRCChkCap+ ECRCChkEn- > MultHdrRecCap+ MultHdrRecEn- TLPPfxPres- HdrLogCap- > HeaderLog: 00000000 00000000 00000000 00000000 > RootCmd: CERptEn+ NFERptEn+ FERptEn+ > RootSta: CERcvd- MultCERcvd- UERcvd- MultUERcvd- > FirstFatal- NonFatalMsg- FatalMsg- IntMsg 0 > ErrorSrc: ERR_COR: 0000 ERR_FATAL/NONFATAL: 0000 > Capabilities: [148 v1] Secondary PCI Express <?> > Capabilities: [168 v1] Physical Layer 16.0 GT/s <?> > Capabilities: [190 v1] Lane Margining at the Receiver <?> > Capabilities: [1c0 v1] L1 PM Substates > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > L1_PM_Substates+ > PortCommonModeRestoreTime=60us PortTPowerOnTime=40us > L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > T_CommonMode=10us LTR1.2_Threshold=0ns > L1SubCtl2: T_PwrOn=10us > Capabilities: [1d0 v1] Vendor Specific Information: ID=0002 Rev=4 > Len=100 <?> > Capabilities: [2d0 v1] Vendor Specific Information: ID=0001 Rev=1 > Len=038 <?> > Capabilities: [308 v1] Data Link Feature <?> > Capabilities: [314 v1] Precision Time Measurement > PTMCap: Requester:+ Responder:+ Root:+ > PTMClockGranularity: 16ns > PTMControl: Enabled:- RootSelected:- > PTMEffectiveGranularity: Unknown > Capabilities: [320 v1] Vendor Specific Information: ID=0004 Rev=1 > Len=054 <?> > Kernel driver in use: pcieport > 00: de 10 d0 1a 07 01 10 00 a1 00 04 06 00 00 01 00 > 10: 00 00 00 00 00 00 00 00 00 01 ff 00 f0 00 00 00 > 20: 00 40 00 40 f1 ff 01 00 00 00 00 00 00 00 00 00 > 30: 00 00 00 00 40 00 00 00 00 00 00 00 32 01 02 00 > 40: 01 50 c3 c9 08 00 00 00 00 00 00 00 00 00 00 00 > 50: 05 70 80 01 00 00 00 00 00 00 00 00 00 00 00 00 > 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 70: 10 b0 42 00 01 80 00 00 1f 28 10 00 84 4c 7b 00 > 80: 40 04 12 f0 00 00 00 00 c0 03 40 00 18 00 01 00 > 90: 00 00 00 00 1f 0c 01 00 00 04 00 00 1e 00 80 01 > a0: 04 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 > b0: 11 00 07 00 02 00 00 00 02 00 01 00 00 00 00 00 > c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
