Re: Linux 5.15-rc1

From: Heiner Kallweit
Date: Mon Sep 13 2021 - 16:23:11 EST

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