10.PCIESwitch-2.PCIE桥的配置空间-《计算机知识》

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2025-11-02 22:24:28 系统网络来源：ZONE.CI 全球网 0 阅读模式

PCIE桥的配置空间
- 参考文档：
- 配置空间格式
- ID相关
  - 查看ID表(复习)
  - Class Code
  - Bus Number相关
  - IO/MEM BASE/Limit
  - IO BASE Upper 16BIT/ IO Limit Upper 16BIT
  - Bridge Control Register
    - Master Abort Mode
- 实战解析

PCIE桥的配置空间

参考文档：

PCI Express Base_r5_1.pdf P7.5.1.3节
PCI+EXPRESS体系结构导读.pdf P2.3.3节

注：因为配置太多，持续更新中

配置空间格式

ID相关

查看ID表(复习)

获取厂家信息：从pci.ids中进行对比，来查找厂家信息和设备信息。 pci的id表收录在 pci-ids.ucw.cz 中

PCI ID Project at The PCI ID Repository，注册登陆后（公司是PCI-SIG组织成员），可以增加修改对应device id的描述信息，需要maintainer审批合入后，展示在PCI ID网站上 sudo update-pciids 命令可以更新pci.ids 在此位置/usr/share/misc/pci.ids可以查看更新后pci.ids文件

注：这里边也有Class code表，可以搜索下边关键字

# List of known device classes, subclasses and programming interfaces
# Syntax:
# C class   class_name
#   subclass    subclass_name       <-- single tab
#       prog-if  prog-if_name   <-- two tabs

Class Code

桥设备的Class Code 在lspci查看时，为： xx xx 06

C 06  Bridge                                                                                                                                                                                                                                                                  
    00  Host bridge   ###
    01  ISA bridge
    02  EISA bridge
    03  MicroChannel bridge
    04  PCI bridge    ###
        00  Normal decode
        01  Subtractive decode
    05  PCMCIA bridge
    06  NuBus bridge
    07  CardBus bridge
    08  RACEway bridge
        00  Transparent mode
        01  Endpoint mode
    09  Semi-transparent PCI-to-PCI bridge
        40  Primary bus towards host CPU
        80  Secondary bus towards host CPU
    0a  InfiniBand to PCI host bridge
    80  Bridge

Bus Number相关

sec - secondary bus，下一级buspri - primary bus, 上一级bussub - subordinate bus，当前总线树的最末级bus号。 2.PCIE桥的配置空间 - 图2

IO/MEM BASE/Limit

存放PCI子树中所有IO/MEM设备的基地址和大小。 MEM的空间大小至少为1M

IO BASE Upper 16BIT/ IO Limit Upper 16BIT

如果PCI仅仅支持16位的IO端口，那么这两个配置只读如果PCI支持32位的IO端口，那么这两个配置提供了高16位地址。

Bridge Control Register

Master Abort Mode

是以前得pci-to-pci bridge， PCIE 必须是是0b，软件只读

实战解析

(base) baiy@inno-MS-7B89:~$ sudo lspci -s 00:01.1 -vvvvxxxx
00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 1483 (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 ? routed to IRQ 26
    Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
    I/O behind bridge: 0000f000-00000fff
    Memory behind bridge: f7900000-f79fffff
    Prefetchable memory behind bridge: 00000000fff00000-00000000000fffff
    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: [50] 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: [58] Express (v2) Root 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 512 bytes, MaxReadReq 512 bytes
        DevSta:    CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
        LnkCap:    Port #1, Speed 8GT/s, Width x4, ASPM L1, Exit Latency L0s <512ns, L1 <64us
            ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
        LnkCtl:    ASPM Disabled; RCB 64 bytes Disabled- CommClk+
            ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
        LnkSta:    Speed 8GT/s, Width x4, 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 Unknown, PwrInd Unknown, Power- Interlock-
        SltSta:    Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock-
            Changed: MRL- PresDet- LinkState+
        RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible+
        RootCap: CRSVisible+
        RootSta: PME ReqID 0000, PMEStatus- PMEPending-
        DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, LTR+, OBFF Not Supported ARIFwd-
        DevCtl2: Completion Timeout: 65ms to 210ms, TimeoutDis-, LTR+, OBFF Disabled ARIFwd-
        LnkCtl2: Target Link Speed: 8GT/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-
    Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Address: 00000000fee00000  Data: 0000
    Capabilities: [c0] Subsystem: Advanced Micro Devices, Inc. [AMD] Device 1234
    Capabilities: [c8] HyperTransport: MSI Mapping Enable+ Fixed+
    Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
    Capabilities: [150 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, GenCap+ CGenEn- ChkCap+ ChkEn-
    Capabilities: [270 v1] #19
    Capabilities: [2a0 v1] Access Control Services
        ACSCap:    SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans+
        ACSCtl:    SrcValid+ TransBlk- ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans-
    Capabilities: [370 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:
    Capabilities: [3c4 v1] #23
    Capabilities: [400 v1] #25
    Capabilities: [410 v1] #26
    Capabilities: [440 v1] #27
    Kernel driver in use: pcieport
00: 22 10 83 14 07 04 10 00 00 00 04 06 10 00 81 00
10: 00 00 00 00 00 00 00 00 00 01 01 00 f1 01 00 20
20: 90 f7 90 f7 f1 ff 01 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 50 00 00 00 00 00 00 00 ff 00 12 00
40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50: 01 58 03 c8 00 00 00 00 10 a0 42 01 22 80 00 00
60: 5f 29 00 00 43 38 73 01 40 00 43 70 00 00 04 00
70: 00 00 40 01 10 00 01 00 00 00 00 00 df 19 70 00
80: 06 04 00 00 0e 00 00 00 03 00 1f 00 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 05 c0 81 00 00 00 e0 fe 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 0d c8 00 00 22 10 34 12 08 00 03 a8 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 ff ff ff ff 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00