如何判断一个PCIe的capability是哪个capability

68 阅读 0 评论 45 点赞

我是靠谱客的博主落后野狼，最近开发中收集的这篇文章主要介绍如何判断一个PCIe的capability是哪个capability，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

首先 lspci -s a2:01.0 -vvv

a2:01.0 PCI bridge: Dawning Information Industry Co., Ltd. Device abcd (prog-if 00 [Normal decode])
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 63
NUMA node: 1
Bus: primary=a2, secondary=a3, subordinate=a3, sec-latency=0
I/O behind bridge: 0000f000-00000fff [empty]
Memory behind bridge: bc400000-bc4fffff [size=1M]
Prefetchable memory behind bridge: 0000050140100000-00000501401fffff [size=1M]
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
BridgeCtl: Parity- SERR+ NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 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: 00000000fee00000 Data: 40ef
Masking: ffffffff Pending: 00000000
Capabilities: [70] Express (v2) Downstream Port (Slot-), MSI 00
DevCap: MaxPayload 512 bytes, PhantFunc 0
ExtTag+ RBE+
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop-
MaxPayload 256 bytes, MaxReadReq 512 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x2, ASPM L0s L1, Exit Latency L0s <1us, L1 <2us
ClockPM- Surprise- LLActRep+ BwNot- ASPMOptComp+
LnkCtl: ASPM Disabled; Disabled- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x2, TrErr- Train- SlotClk+ DLActive+ BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported ARIFwd+
AtomicOpsCap: Routing+
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled ARIFwd-
AtomicOpsCtl: EgressBlck-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-, Selectable De-emphasis: -6dB
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
Capabilities: [c0] Slot ID: 0 slots, First-, chassis 00
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- NonFatalErr-
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
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] #19
Capabilities: [178 v1] #26
Capabilities: [19c v1] #27
Capabilities: [1b4 v1] Access Control Services
ACSCap: SrcValid- TransBlk- ReqRedir+ CmpltRedir+ UpstreamFwd- EgressCtrl+ DirectTrans+
ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir- UpstreamFwd- EgressCtrl- DirectTrans-
Capabilities: [1c0 v1] Vendor Specific Information: ID=0002 Rev=4 Len=100 <?>
Capabilities: [2c0 v1] Vendor Specific Information: ID=0001 Rev=1 Len=038 <?>
Capabilities: [2f8 v1] #25
Capabilities: [304 v1] #29
Capabilities: [400 v1] #12
Kernel driver in use: pcieport