On Fri, 2010-06-11 at 09:30 +0800, jxnuxdy wrote:

Hi guys,

I encountered a PCIe problem under linux, the two PCIe bus on my board seems work, 
at least I can access the registers through the PCIe bus, however the dma for the
PCIe bus can't work, so I just dumped the pci device, but I am curiously to find
there is no regions displayed on PCIe controlers, why? is it relate with my 'dma' issue then?

It would help if you told us a bit more what the HW is, what you are
doing with it, etc...

IE. What is your host, what is your device, what platform, etc...

DMA should work provided that your platform code sets it up properly.
The DMA regions don't appear in /proc/pci or lspci.

Cheers,
Ben.

bash-2.04# cat /proc/pci
PCI devices found:
  Bus  0, device   0, function  0:
    Class 0b20  Header Type 01: PCI device 1957:0032 (rev 17).
  Bus  1, device   0, function  0:
    Class 0580  Header Type 00: PCI device 11ab:db90 (rev 1).
      Prefetchable 64 bit memory at 0x80000000 [0x800fffff].
      Prefetchable 64 bit memory at 0x84000000 [0x87ffffff].
  Bus  9, device   0, function  0:
    Class 0b20  Header Type 01: PCI device 1957:0032 (rev 17).
  Bus 10, device   0, function  0:
    Class 0580  Header Type 00: PCI device 11ab:db90 (rev 1).
      Prefetchable 64 bit memory at 0xa0000000 [0xa00fffff].
      Prefetchable 64 bit memory at 0xa4000000 [0xa7ffffff].
bash-2.04# lspci -vv
00:00.0 Power PC: Unknown device 1957:0032 (rev 11)
        !!! Invalid class 0b20 for header type 01
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
        Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Latency: 0, cache line size 08
        Bus: primary=00, secondary=01, subordinate=06, sec-latency=0
        I/O behind bridge: 00000000-00000fff
        Memory behind bridge: 80000000-9fffffff
        BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
        Capabilities: [44] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [4c] #10 [0041]

01:00.0 Memory controller: Galileo Technology Ltd.: Unknown device db90 (rev 01)
        Subsystem: Galileo Technology Ltd.: Unknown device 11ab
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
        Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Latency: 0, cache line size 08
        Interrupt: pin A routed to IRQ 0
        Region 0: Memory at 80000000 (64-bit, prefetchable) [size=1M]
        Region 2: Memory at 84000000 (64-bit, prefetchable) [size=64M]
        Capabilities: [40] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [50] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
                Address: 0000000000000000  Data: 0000
        Capabilities: [60] #10 [0011]

09:00.0 Power PC: Unknown device 1957:0032 (rev 11)
        !!! Invalid class 0b20 for header type 01
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
        Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Latency: 0, cache line size 08
        Bus: primary=00, secondary=0a, subordinate=0f, sec-latency=0
        I/O behind bridge: 00000000-00000fff
        Memory behind bridge: a0000000-bfffffff
        BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
        Capabilities: [44] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [4c] #10 [0041]

0a:00.0 Memory controller: Galileo Technology Ltd.: Unknown device db90 (rev 01)
        Subsystem: Galileo Technology Ltd.: Unknown device 11ab
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
        Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Latency: 0, cache line size 08
        Interrupt: pin A routed to IRQ 0
        Region 0: Memory at a0000000 (64-bit, prefetchable) [size=1M]
        Region 2: Memory at a4000000 (64-bit, prefetchable) [size=64M]
        Capabilities: [40] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [50] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
                Address: 0000000000000000  Data: 0000
        Capabilities: [60] #10 [0011]

bash-2.04# 

Thanks
Denny

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