PCIe bus seems work while 'dma' can't under linux
jxnuxdy
jxnuxdy at 163.com
Tue Jun 15 17:05:56 EST 2010
Thanks Benjamin, the regions don't display as what we expect, that's why we suspect if there any configuration probelms in CPU host bridge, but we changed the uboot/linux a lot, seems take no effect on that problems.
We use CPU MPC8544, and connect two PCIE devices to CPU PCIE1 and PCIE2 directly without a extended PCIE bridge, so we disabled PCIE3 and PCI controlers in uboot level.
More settings pls take a look at the attach file log.txt.
Many thanks,
Denny
----------------------------------------------------------------------------------------------------------------------------
在2010-06-11 15:21:24，"Benjamin Herrenschmidt" <benh at kernel.crashing.org> 写道：
>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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>> Linuxppc-dev at lists.ozlabs.org
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>
>
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