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Message-ID: <CAMj1kXHoc283aHT2EjxyRe8_cTWn_SUGoVLNKJ+40ia8Fppynw@mail.gmail.com>
Date: Tue, 11 May 2021 14:30:36 +0200
From: Ard Biesheuvel <ardb@...nel.org>
To: Ansuel Smith <ansuelsmth@...il.com>
Cc: Matthew Wilcox <willy@...radead.org>,
Russell King <linux@...linux.org.uk>,
Jonathan Corbet <corbet@....net>,
Linus Walleij <linus.walleij@...aro.org>,
Florian Fainelli <f.fainelli@...il.com>,
Abbott Liu <liuwenliang@...wei.com>,
Luis Chamberlain <mcgrof@...nel.org>,
Palmer Dabbelt <palmerdabbelt@...gle.com>,
Linux Doc Mailing List <linux-doc@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm: Enlarge IO_SPACE_LIMIT needed for some SoC
On Tue, 11 May 2021 at 14:15, Ansuel Smith <ansuelsmth@...il.com> wrote:
>
> On Tue, May 11, 2021 at 06:26:28AM +0200, Ard Biesheuvel wrote:
> > On Tue, 11 May 2021 at 04:32, Ansuel Smith <ansuelsmth@...il.com> wrote:
> > >
> > > On Tue, May 11, 2021 at 03:24:29AM +0100, Matthew Wilcox wrote:
> > > > On Tue, May 11, 2021 at 04:16:54AM +0200, Ansuel Smith wrote:
> > > > > Ipq8064 SoC requires larger IO_SPACE_LIMIT on second and third pci port.
> > > >
> > > > Do you really? I mean, yes, theoretically, I understand it, the
> > > > hardware supports 64kB of I/O port space per root port. But I/O
> > > > port space is rather deprecated these days. My laptop has precisely
> > > > two devices with I/O ports, one with 64 bytes and the other with 32
> > > > bytes. Would you really suffer by allocating 16kB of I/O port
> > > > space to each root port?
> > >
> > > We were talking about this in the other wrong patch. I also think this
> > > much space looks wrong. The current ipq806x dts have this space so it's
> > > actually broken from a long time. The only reason pci worked before was
> > > because the pci driver didn't actually check if the settings were right.
> > > New kernel introduced more checks and this problem showed up. (to be
> > > more precise, the pci port are commonly used by the ath10k wifi and the
> > > second ath10k wifi fails to init because of this problem)
> > > If you can give me any hint on how to check if the space can be reduced
> > > I would be very happy to investigate it.
> > > In the driver I notice that the max buffer is set to 2k, could be this a
> > > hint?
> > >
> >
> > Could you share the output of lspci -vv from such a system?
> >
> > I agree with Matthew that fiddling with the size of the I/O space
> > range probably papers over another problem, and with the odd
> > exception, no PCIe card used on ARM systems actually uses their I/O
> > BARs, even when they have them. (I used to carry a PCIe serial port
> > card to UEFI plugfests because that was the only thing that would stop
> > working if a system configured its I/O resource window incorrectly)
>
> Here is the output of lspci -vv
>
> 0000:00:00.0 PCI bridge: Qualcomm Device 0101 (prog-if 00 [Normal decode])
> Bus: primary=00, secondary=01, subordinate=ff, sec-latency=0
> I/O behind bridge: [disabled]
> Memory behind bridge: 08000000-081fffff [size=2M]
> Prefetchable memory behind bridge: [disabled]
So this a MMIO window to the endpoint
...
>
> 0000:01:00.0 Network controller: Qualcomm Atheros QCA9984 802.11ac Wave 2 Wireless Network Adapter
> Region 0: Memory at 08000000 (64-bit, non-prefetchable) [size=2M]
... and the endpoint has a single *MMIO* BAR of size 2 MiB.
This has *nothing* to do with port I/O, which is what you are
modifying with your patch.
Did you check that the problem exists without the patch, and that the
patch makes it go away?
> 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=1/32 Maskable+ 64bit+
> Address: 000000004361bc88 Data: 0001
> Masking: fffffffe Pending: 00000000
> 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 0.000W
> DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
> RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
> MaxPayload 128 bytes, MaxReadReq 128 bytes
> DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend-
> LnkCap: Port #0, Speed 5GT/s, Width x1, ASPM not supported
> ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
> LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> LnkSta: Speed 5GT/s (ok), Width x1 (ok)
> TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
> DevCap2: Completion Timeout: Range ABCD, 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: [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: [148 v1] Device Serial Number 00-00-00-00-00-00-00-00
> Capabilities: [158 v1] Latency Tolerance Reporting
> Max snoop latency: 0ns
> Max no snoop latency: 0ns
> Capabilities: [160 v1] L1 PM Substates
> L1SubCap: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- L1_PM_Substates-
> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
> L1SubCtl2:
> Kernel driver in use: ath10k_pci
>
> 0001:00:00.0 PCI bridge: Qualcomm Device 0101 (prog-if 00 [Normal decode])
> Device tree node: /sys/firmware/devicetree/base/soc/pci@...00000/bridge@0,0
> 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 46
> Bus: primary=00, secondary=01, subordinate=ff, sec-latency=0
> I/O behind bridge: [disabled]
> Memory behind bridge: 2e000000-2e1fffff [size=2M]
> Prefetchable memory behind bridge: [disabled]
> 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: 00000000435e8688 Data: 0000
> Capabilities: [70] Express (v2) Root Port (Slot-), MSI 00
> DevCap: MaxPayload 128 bytes, PhantFunc 0
> ExtTag- RBE+
> DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq+
> RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
> MaxPayload 128 bytes, MaxReadReq 128 bytes
> DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
> LnkCap: Port #0, Speed 5GT/s, Width x4, ASPM L0s L1, Exit Latency L0s <1us, L1 <16us
> ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
> LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> LnkSta: Speed 2.5GT/s (downgraded), Width x1 (downgraded)
> TrErr- Train- SlotClk+ DLActive+ BWMgmt- ABWMgmt-
> RootCap: CRSVisible-
> RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
> RootSta: PME ReqID 0000, PMEStatus- PMEPending-
> DevCap2: Completion Timeout: Not Supported, TimeoutDis+ NROPrPrP+ LTR-
> 10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt- EETLPPrefix-
> EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
> FRS- LN System CLS Not Supported, TPHComp- ExtTPHComp- ARIFwd-
> AtomicOpsCap: Routing- 32bit- 64bit- 128bitCAS-
> DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR- OBFF Disabled, ARIFwd-
> AtomicOpsCtl: ReqEn- EgressBlck-
> LnkCap2: Supported Link Speeds: 2.5-5GT/s, Crosslink- Retimer- 2Retimers- DRS-
> LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
> Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
> Compliance De-emphasis: -6dB
> LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1-
> EqualizationPhase2- EqualizationPhase3- LinkEqualizationRequest-
> Retimer- 2Retimers- CrosslinkRes: unsupported
> 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- 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
> Kernel driver in use: pcieport
>
> 0001:01:00.0 Network controller: Qualcomm Atheros QCA9984 802.11ac Wave 2 Wireless Network Adapter
> Subsystem: Qualcomm Atheros Device cafe
> Device tree node: /sys/firmware/devicetree/base/soc/pci@...00000/bridge@0,0/wifi@1,0
> 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 54
> Region 0: Memory at 2e000000 (64-bit, non-prefetchable) [size=2M]
> 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=1/32 Maskable+ 64bit+
> Address: 00000000435e8688 Data: 0001
> Masking: fffffffe Pending: 00000000
> 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 0.000W
> DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
> RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
> MaxPayload 128 bytes, MaxReadReq 128 bytes
> DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend-
> LnkCap: Port #0, Speed 5GT/s, Width x1, ASPM not supported
> ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
> LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> LnkSta: Speed 2.5GT/s (downgraded), Width x1 (ok)
> TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
> DevCap2: Completion Timeout: Range ABCD, 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: -3.5dB, EqualizationComplete- EqualizationPhase1-
> EqualizationPhase2- EqualizationPhase3- LinkEqualizationRequest-
> Retimer- 2Retimers- CrosslinkRes: unsupported
> 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: [148 v1] Device Serial Number 00-00-00-00-00-00-00-00
> Capabilities: [158 v1] Latency Tolerance Reporting
> Max snoop latency: 0ns
> Max no snoop latency: 0ns
> Capabilities: [160 v1] L1 PM Substates
> L1SubCap: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- L1_PM_Substates-
> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
> L1SubCtl2:
> Kernel driver in use: ath10k_pci
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