问题描述
我们正在使用Xilinx Vivado开发带有VC709 FPGA的定制处理器，Microblaze和一些外设的系统.我们在用于PCI Express的AXI桥"中使用了两个"PCIe:BARs".
We are developing a system with a custom processor, Microblaze and some peripherals in VC709 FPGA using Xilinx Vivado. We are using two 'PCIe : BARs' in 'AXI Bridge for PCI express'.
最初，命令'lspci -vv'用于显示Ubuntu终端中的内存区域.
Initially the command 'lspci -vv' used to show memory regions in the Ubuntu teminal.
$ lspci -vv
0a:00.0 Memory controller: Xilinx Corporation Device 7038 | 0a:00.0 Memory controller: Xilinx Corporation Device 7018
Subsystem: Xilinx Corporation Device 0007 | Subsystem: Xilinx Corporation Device 0008
Physical Slot: 3 | Physical Slot: 3
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- Pa| Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- Pa
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-| Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
Interrupt: pin A routed to IRQ 16 | Interrupt: pin A routed to IRQ 16
Region 0: Memory at fbff0000 (32-bit, non-prefetchable) [size=| ----------------------------------------------------------------------
Region 1: Memory at fb800000 (32-bit, non-prefetchable) [size=| ----------------------------------------------------------------------
Capabilities: <access denied> | Capabilities: <access denied>
Kernel modules: riffa
我已经创建了项目的副本并在设计中进行了一些编辑(不幸的是，我不记得了)，现在"lspci -vv"的结果如下.请注意，现在缺少 Region 0 和 Region 1 .
I have created a copy of the project and edited something in the design (which I don't remember unfortunately) and now the result of 'lspci -vv' is as follows. Please note that Region 0 and Region 1 are missing now.
$ lspci -vv
0a:00.0 Memory controller: Xilinx Corporation Device 7018
Subsystem: Xilinx Corporation Device 0008
Physical Slot: 3
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-
Interrupt: pin A routed to IRQ 16
Capabilities: <access denied>
Kernel modules: riffa
问:可能是什么原因?
注意:
- 两个项目的模块设计和连接完全相同
- "PCI Express Gen3.0子系统的AXI桥"的选项在两个项目中都是相同的
谢谢:)
社区所需的其他信息
$ sudo lspci -vv
0a:00.0 Memory controller: Xilinx Corporation Device 7018
Subsystem: Xilinx Corporation Device 0008
Physical Slot: 3
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-
Interrupt: pin A routed to IRQ 16
Capabilities: [80] 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: [90] MSI: Enable- Count=1/1 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [c0] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
DevCtl: Report errors: Correctable- Non-Fatal+ Fatal+ Unsupported-
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
MaxPayload 128 bytes, MaxReadReq 4096 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr- TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x8, ASPM unknown, Latency L0 unlimited, L1 unlimited
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x4, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range B, TimeoutDis+
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-
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: -6dB
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, GenCap- CGenEn- ChkCap- ChkEn-
Kernel modules: riffa$ sudo od -tx1z -Ax /proc/bus/pci/0a/00.0
000000 ee 10 38 70 43 00 10 00 00 00 80 05 10 00 00 00 >..8pC...........<
000010 00 00 ff fb 00 00 00 00 00 00 00 00 00 00 00 00 >................<
000020 00 00 00 00 00 00 00 00 00 00 00 00 ee 10 07 00 >................<
000030 00 00 00 00 80 00 00 00 00 00 00 00 0b 01 00 00 >................<
000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
000080 01 90 03 00 08 00 00 00 00 00 00 00 00 00 00 00 >................<
000090 05 c0 80 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
0000a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
0000b0 11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
0000c0 10 00 02 00 02 80 00 00 16 58 09 00 83 f0 43 00 >.........X....C.<
0000d0 40 00 42 10 00 00 00 00 00 00 00 00 00 00 00 00 >@.B.............<
0000e0 00 00 00 00 12 00 00 00 00 00 00 00 0e 00 00 00 >................<
0000f0 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
000100 01 00 02 30 00 00 10 00 00 00 10 00 20 00 00 00 >...0........ ...<
000110 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >. ..............<
000120 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
000150 03 00 01 30 00 00 00 00 00 00 00 00 00 00 00 00 >...0............<
000160 04 00 41 27 00 00 00 00 f0 80 0b 00 00 00 00 00 >..A'............<
000170 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
0001b0 00 00 00 00 00 00 00 00 18 00 01 30 00 00 00 00 >...........0....<
0001c0 16 00 01 30 07 00 00 00 00 00 00 00 00 01 00 00 >...0............<
0001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
000270 00 00 00 00 17 00 01 30 05 00 00 00 00 00 00 00 >.......0........<
000280 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
000300 19 00 01 00 00 00 00 00 00 00 00 00 7f 7f 7f 7f >................<
000310 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 00 00 00 00 >................<
000320 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
0003c0 02 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
0003d0 00 00 00 00 01 00 00 80 00 00 00 00 00 00 00 00 >................<
0003e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
001000推荐答案
您的设备未启用内存空间(我最初没有注意到这一点).
The memory space is not enabled in your device (I did not notice this in the first place).
在左侧设备列表的控制"行中，您具有"Mem +"，而在右侧设备中则具有"Mem-"(用于I/O访问的同上).在PCI规范中，Mem标志是命令寄存器的位1.
In the device listing on the left, in the Control line, you have "Mem+" but on the right you have "Mem-" (ditto for I/O access). In the PCI spec, the Mem flag is bit 1 of the Command register.
通常，在Linux中，驱动程序调用pci_enable_device函数，该函数将设备置于联机状态，并按照驱动程序的指示启用内存和/或I/O访问(即，将1写入两位或任意一位) .另请参见 Documentation/PCI/pci.txt 有关编写驱动程序的指南.
Typically, in linux, a driver calls pci_enable_device function, which brings the device online and enables memory and/or I/O access as directed by the driver (that is, it writes a 1 into either or both bits). See also Documentation/PCI/pci.txt for guidance on writing drivers.
我的猜测是lspci只是不显示BAR，因为未启用设备的内存空间.似乎至少已将相同的地址-0xfbff0000- 分配给BAR 0 [请参见/proc/bus/pci转储中的偏移量0x10]. BAR 1地址插槽中的地址偏移0x14处没有编程的地址.
My guess is that lspci just isn't showing the BAR because the device's memory space isn't enabled; it appears that the same address -- 0xfbff0000 -- has been assigned to BAR 0 at least [see offset 0x10 in the /proc/bus/pci dump]. There is no address programmed in the BAR 1 address slot at offset 0x14.
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