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Re: [PATCH 1/1] pcie-root-port: Fast PCIe root ports for new machine


From: Gao,Shiyuan
Subject: Re: [PATCH 1/1] pcie-root-port: Fast PCIe root ports for new machine
Date: Tue, 3 Dec 2024 12:15:22 +0000

> > Some hardware devices now support PCIe 5.0, so change the default
> > speed of the PCIe root port on new machine types.
> >
> > For passthrough Nvidia H20, this will be able to increase the h2d/d2h
> > bandwidth ~17%.
>
>
> I'm curious. Why are you seeing the perf improvement?
>
>
> Maybe my mental model is wrong, but I though we just faked these
> registers so there should be no actual change of the link speed
> just a change in what the guest sees. Is the driver using this
> information to tune something else?
>
>
> I recently added support for the equivalent to CXL port emulation
> to support performance characteristic discovery but so far I think
> that's only informational for userspace software rather than affecting
> hardware usage directly.

Sorry, this email is forgotten to cc qemu-devel.

I'm also very curious about this. Maybe, as you mentioned,
the driver is using this information to make some settings?

But when I use ioh3420(it only support PCIe gen1) and pcie root port gen1, it
can alse get same bandwidth with gen4.

|---------------------------|------------|------------|
|       root port           |  d2h(MB/s) |  h2d(MB/s) |
|---------------------------|------------|------------|
|  ioh3420 (gen1)           |  45976.2   |  45681.9   |
|-----------------------------------------------------|
|  pcie root port (gen1)    |  45846.5   |  45993.7   |
|-----------------------------------------------------|
|  pcie root port (gen4)    |  45980.3   |  45915.4   |
|-----------------------------------------------------|
|  pcie root port (gen5)    |  53766.0   |  53682.0   |
|-----------------------------------------------------|

I would be glad if someone could explain it. Anyway, supporting Gen 5
won’t make things any worse.

Some information can get from VM as follow:

Origin pcie root port only support PCIe gen4
  dmesg
  [   21.930515] pci 0000:61:00.0: [10de:2329] type 00 class 0x030200
  [   22.339006] pci 0000:61:00.0: reg 0x10: [mem 0x26002000000-0x26002ffffff 
64bit pref]
  [   22.462006] pci 0000:61:00.0: reg 0x18: [mem 0x24000000000-0x25fffffffff 
64bit pref]
  [   22.588005] pci 0000:61:00.0: reg 0x20: [mem 0x26000000000-0x26001ffffff 
64bit pref]
  [   22.713135] pci 0000:61:00.0: Max Payload Size set to 128 (was 256, max 
256)
  [   22.714223] pci 0000:61:00.0: Enabling HDA controller
  [   22.716635] pci 0000:61:00.0: 252.048 Gb/s available PCIe bandwidth, 
limited by 16.0 GT/s PCIe x16 link at 0000:60:00.0 (capable of 504.112 Gb/s 
with 32.0 GT/s PCIe x16 link)
  PCIe capability
  60:00.0 PCI bridge: Red Hat, Inc. QEMU PCIe Root port (prog-if 00 [Normal 
decode])
  Capabilities: [54] 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 16GT/s, Width x32, ASPM L0s, Exit 
Latency L0s <64ns
                        ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp-
                LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 16GT/s (ok), Width x16 (downgraded)
                        TrErr- Train- SlotClk- DLActive+ BWMgmt- ABWMgmt-
                SltCap: AttnBtn+ PwrCtrl+ MRL- AttnInd+ PwrInd+ HotPlug+ 
Surprise+
                        Slot #0, PowerLimit 0.000W; Interlock+ NoCompl-
                SltCtl: Enable: AttnBtn+ PwrFlt- MRL- PresDet- CmdCplt+ HPIrq+ 
LinkChg-
                        Control: AttnInd Off, PwrInd On, Power- Interlock-
                SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ 
Interlock-
                        Changed: MRL- PresDet- LinkState-
                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+, MaxEETLPPrefixes 4
                         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: 2.5-16GT/s, Crosslink- Retimer- 
2Retimers- DRS-
                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-
                         Retimer- 2Retimers- CrosslinkRes: unsupported
    61:00.0 3D controller: NVIDIA Corporation Device 2329 (rev a1)
    Capabilities: [60] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, 
L1 <1us
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ 
SlotPowerLimit 75.000W
                DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop- FLReset-
                        MaxPayload 256 bytes, MaxReadReq 4096 bytes
                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- 
TransPend-
                LnkCap: Port #0, Speed 32GT/s, Width x16, ASPM L1, Exit Latency 
L1 <4us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 32GT/s (ok), Width x16 (ok)
                        TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP- 
LTR+
                         10BitTagComp+ 10BitTagReq+ OBFF Via message, 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: 2.5-32GT/s, Crosslink- Retimer+ 
2Retimers+ DRS-
                LnkCtl2: Target Link Speed: 32GT/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

pcie root port support PCIe gen1
  dmesg
  [   21.419206] pci 0000:61:00.0: [10de:2329] type 00 class 0x030200
  [   21.827005] pci 0000:61:00.0: reg 0x10: [mem 0x5e002000000-0x5e002ffffff 
64bit pref]
  [   21.952005] pci 0000:61:00.0: reg 0x18: [mem 0x5c000000000-0x5dfffffffff 
64bit pref]
  [   22.074005] pci 0000:61:00.0: reg 0x20: [mem 0x5e000000000-0x5e001ffffff 
64bit pref]
  [   22.196136] pci 0000:61:00.0: Max Payload Size set to 128 (was 256, max 
256)
  [   22.197232] pci 0000:61:00.0: Enabling HDA controller
  [   22.199566] pci 0000:61:00.0: 2.000 Gb/s available PCIe bandwidth, limited 
by 2.5 GT/s PCIe x1 link at 0000:60:00.0 (capable of 504.112 Gb/s with 32.0 
GT/s PCIe x16 link)
  PCIe capability
  60:00.0 PCI bridge: Red Hat, Inc. QEMU PCIe Root port (prog-if 00 [Normal 
decode])
        Capabilities: [54] 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 2.5GT/s, Width x1, ASPM L0s, Exit 
Latency L0s <64ns
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
                LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s (ok), Width x1 (ok)
                        TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
                SltCap: AttnBtn+ PwrCtrl+ MRL- AttnInd+ PwrInd+ HotPlug+ 
Surprise+
                        Slot #0, PowerLimit 0.000W; Interlock+ NoCompl-
                SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- 
LinkChg-
                        Control: AttnInd Off, PwrInd On, Power- Interlock-
                SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet- 
Interlock-
                        Changed: MRL- PresDet- LinkState-
                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+, MaxEETLPPrefixes 4
                         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-
                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: -6dB, EqualizationComplete- 
EqualizationPhase1-
                         EqualizationPhase2- EqualizationPhase3- 
LinkEqualizationRequest-
                         Retimer- 2Retimers- CrosslinkRes: unsupported
  61:00.0 3D controller: NVIDIA Corporation Device 2329 (rev a1)
        Capabilities: [60] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, 
L1 <1us
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ 
SlotPowerLimit 75.000W
                DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop- FLReset-
                        MaxPayload 256 bytes, MaxReadReq 4096 bytes
                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- 
TransPend-
                LnkCap: Port #0, Speed 32GT/s, Width x16, ASPM L1, Exit Latency 
L1 <4us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 32GT/s (ok), Width x16 (ok)
                        TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP- 
LTR+
                         10BitTagComp+ 10BitTagReq+ OBFF Via message, 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: 2.5-32GT/s, Crosslink- Retimer+ 
2Retimers+ DRS-
                LnkCtl2: Target Link Speed: 32GT/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

with this patch pcie root port support PCIe gen5
  dmesg doesn't have this info.
  PCIe capability
  60:00.0 PCI bridge: Red Hat, Inc. QEMU PCIe Root port (prog-if 00 [Normal 
decode])
  Capabilities: [54] 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 32GT/s, Width x32, ASPM L0s, Exit Latency L0s 
<64ns
                ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp-
        LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
                ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
        LnkSta: Speed 32GT/s (ok), Width x16 (downgraded)
                TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
        SltCap: AttnBtn+ PwrCtrl+ MRL- AttnInd+ PwrInd+ HotPlug+ Surprise+
                Slot #0, PowerLimit 0.000W; Interlock+ NoCompl-
        SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg-
                Control: AttnInd Off, PwrInd On, Power- Interlock-
        SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet- Interlock-
                Changed: MRL- PresDet- LinkState-
        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+, MaxEETLPPrefixes 4
                 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: 2.5-16GT/s, Crosslink- Retimer- 
2Retimers- DRS-
        LnkCtl2: Target Link Speed: 32GT/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
  61:00.0 3D controller: NVIDIA Corporation Device 2329 (rev a1)
  Capabilities: [60] Express (v2) Endpoint, MSI 00
        DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
                ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 
75.000W
        DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq-
                RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop- FLReset-
                MaxPayload 256 bytes, MaxReadReq 4096 bytes
        DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
        LnkCap: Port #0, Speed 32GT/s, Width x16, ASPM L1, Exit Latency L1 <4us
                ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
        LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
                ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
        LnkSta: Speed 32GT/s (ok), Width x16 (ok)
                TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
        DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP- LTR+
                 10BitTagComp+ 10BitTagReq+ OBFF Via message, 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: 2.5-32GT/s, Crosslink- Retimer+ 
2Retimers+ DRS-
        LnkCtl2: Target Link Speed: 32GT/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

use ioh3420 as root port:
  dmesg
  [   19.922501] pci 0000:61:00.0: [10de:2329] type 00 class 0x030200
  [   20.325006] pci 0000:61:00.0: reg 0x10: [mem 0x26002000000-0x26002ffffff 
64bit pref]
  [   20.443005] pci 0000:61:00.0: reg 0x18: [mem 0x24000000000-0x25fffffffff 
64bit pref]
  [   20.557005] pci 0000:61:00.0: reg 0x20: [mem 0x26000000000-0x26001ffffff 
64bit pref]
  [   20.671137] pci 0000:61:00.0: Max Payload Size set to 128 (was 256, max 
256)
  [   20.672207] pci 0000:61:00.0: Enabling HDA controller
  [   20.674744] pci 0000:61:00.0: 2.000 Gb/s available PCIe bandwidth, limited 
by 2.5 GT/s PCIe x1 link at 0000:60:00.0 (capable of 504.112 Gb/s with 32.0 
GT/s PCIe x16 link)
  PCIe capability
  60:00.0 PCI bridge: Intel Corporation 7500/5520/5500/X58 I/O Hub PCI Express 
Root Port 0 (rev 02) (prog-if 00 [Normal decode])
  Capabilities: [90] 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 2.5GT/s, Width x1, ASPM L0s, Exit 
Latency L0s <64ns
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
                LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s (ok), Width x1 (ok)
                        TrErr- Train- SlotClk- DLActive+ BWMgmt- ABWMgmt-
                SltCap: AttnBtn+ PwrCtrl+ MRL- AttnInd+ PwrInd+ HotPlug+ 
Surprise+
                        Slot #0, PowerLimit 0.000W; Interlock+ NoCompl-
                SltCtl: Enable: AttnBtn+ PwrFlt- MRL- PresDet- CmdCplt+ HPIrq+ 
LinkChg-
                        Control: AttnInd Off, PwrInd On, Power- Interlock-
                SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ 
Interlock-
                        Changed: MRL- PresDet- LinkState-
                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+, MaxEETLPPrefixes 4
                         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-
                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: -6dB, EqualizationComplete- 
EqualizationPhase1-
                         EqualizationPhase2- EqualizationPhase3- 
LinkEqualizationRequest-
                         Retimer- 2Retimers- CrosslinkRes: unsupported
  61:00.0 3D controller: NVIDIA Corporation Device 2329 (rev a1)
  Capabilities: [60] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, 
L1 <1us
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ 
SlotPowerLimit 75.000W
                DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop- FLReset-
                        MaxPayload 256 bytes, MaxReadReq 4096 bytes
                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- 
TransPend-
                LnkCap: Port #0, Speed 32GT/s, Width x16, ASPM L1, Exit Latency 
L1 <4us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 32GT/s (ok), Width x16 (ok)
                        TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP- 
LTR+
                         10BitTagComp+ 10BitTagReq+ OBFF Via message, 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: 2.5-32GT/s, Crosslink- Retimer+ 
2Retimers+ DRS-
                LnkCtl2: Target Link Speed: 32GT/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


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