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Date:   Mon, 13 Sep 2021 16:15:19 -0400
From:   Dave Jones <davej@codemonkey.org.uk>
To:     Heiner Kallweit <hkallweit1@gmail.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
Subject: Re: Linux 5.15-rc1
Message-ID: <20210913201519.GA15726@codemonkey.org.uk>
Mail-Followup-To: Dave Jones <davej@codemonkey.org.uk>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
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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


	Dave