On 13.09.2021 22:15, Dave Jones wrote: > On Mon, Sep 13, 2021 at 08:59:49PM +0200, Heiner Kallweit wrote: > > On 13.09.2021 16:18, Dave Jones wrote: > > > [ 186.595296] pci 0000:02:00.0: [144d:a800] type 00 class 0x010601 > > > [ 186.595351] pci 0000:02:00.0: reg 0x24: [mem 0xdfc10000-0xdfc11fff] > > > [ 186.595361] pci 0000:02:00.0: reg 0x30: [mem 0xdfc00000-0xdfc0ffff pref] > > > [ 186.595425] pci 0000:02:00.0: PME# supported from D3hot D3cold > > > [ 186.735107] pci 0000:02:00.0: VPD access failed. This is likely a firmware bug on this device. Contact the card vendor for a firmware update > > > > Thanks for the report! The stalls may be related to this one. Device is: > > 02:00.0 SATA controller: Samsung Electronics Co Ltd XP941 PCIe SSD (rev 01) > > > > With an older kernel you may experience the stall when accessing the vpd > > attribute of this device in sysfs. > > > > Maybe the device indicates VPD capability but doesn't actually support it. > > Could you please provide the "lspci -vv" output for this device? > > 02:00.0 SATA controller: Samsung Electronics Co Ltd XP941 PCIe SSD (rev 01) (prog-if 01 [AHCI 1.0]) > Subsystem: Samsung Electronics Co Ltd XP941 PCIe SSD > 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: 64 bytes > Interrupt: pin A routed to IRQ 16 > Region 5: Memory at dfc10000 (32-bit, non-prefetchable) [size=8K] > Expansion ROM at dfc00000 [disabled] [size=64K] > 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: [70] Express (v2) Endpoint, MSI 00 > DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited > ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 25.000W > DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq- > RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+ FLReset- > MaxPayload 128 bytes, MaxReadReq 512 bytes > DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- > LnkCap: Port #0, Speed 5GT/s, Width x4, ASPM L0s L1, Exit Latency L0s <4us, L1 <64us > ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+ > LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ > ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > LnkSta: Speed 5GT/s (ok), Width x2 (downgraded) > TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- > DevCap2: Completion Timeout: Not Supported, TimeoutDis+ NROPrPrP- LTR+ > 10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt- EETLPPrefix- > EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit- > FRS- TPHComp- ExtTPHComp- > AtomicOpsCap: 32bit- 64bit- 128bitCAS- > DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR+ OBFF Disabled, > AtomicOpsCtl: ReqEn- > LnkCap2: Supported Link Speeds: 2.5-5GT/s, Crosslink- Retimer- 2Retimers- DRS- > LnkCtl2: Target Link Speed: 5GT/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- > Retimer- 2Retimers- CrosslinkRes: unsupported > Capabilities: [d0] Vital Product Data > Not readable > 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 > Capabilities: [140 v1] Device Serial Number 00-00-00-00-00-00-00-00 > Capabilities: [150 v1] Power Budgeting <?> > Capabilities: [160 v1] Latency Tolerance Reporting > Max snoop latency: 71680ns > Max no snoop latency: 71680ns > Kernel driver in use: ahci > > > > And could you please test with the following applied to verify the > > assumption? It disables VPD access for this device. > > > > --- > > drivers/pci/vpd.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c > > index 517789205..fc92e880e 100644 > > --- a/drivers/pci/vpd.c > > +++ b/drivers/pci/vpd.c > > @@ -540,6 +540,7 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x002f, quirk_blacklist_vpd); > > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x005d, quirk_blacklist_vpd); > > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x005f, quirk_blacklist_vpd); > > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID, quirk_blacklist_vpd); > > +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SAMSUNG, 0xa800, quirk_blacklist_vpd); > > /* > > * The Amazon Annapurna Labs 0x0031 device id is reused for other non Root Port > > * device types, so the quirk is registered for the PCI_CLASS_BRIDGE_PCI class. > > > This didn't help I'm afraid :( > It changed the VPD warning, but that's about it... > > [ 184.235496] pci 0000:02:00.0: calling quirk_blacklist_vpd+0x0/0x22 @ 1 > [ 184.235499] pci 0000:02:00.0: [Firmware Bug]: disabling VPD access (can't determine size of non-standard VPD format) > [ 184.235501] pci 0000:02:00.0: quirk_blacklist_vpd+0x0/0x22 took 0 usecs > With this patch there's no VPD access to this device any longer. So this can't be the root cause. Do you have any other PCI device that has VPD capability? -> Capabilities: [...] Vital Product Data > > Dave > Heiner
