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Ilia Mirkin

2014-Jul-04 02:43 UTC

[Nouveau] How to check for proper MSI support?

On Thu, Jul 3, 2014 at 10:35 PM, Yijing Wang <wangyijing at huawei.com>
wrote:> Hi Brian,
>    From your 01:00.0 VGA compatible controller PCI config register, it
supports 1 MSI vector, so I think this
> card has no problem. But you didn't answer what's the
pci_enable_msi() return during it enable MSI fail.
>
> You can check PCI bus whether support MSI like:
>
> cat /sys/bus/pci/devices/00:0e.0/msi_bus
>
> Other, do you call pci_enable_device() before pci_enable_msi() ?
Yes, the device is enabled. nouveau does generally work for most
people :) And it works fine here if MSI is forced off.

The problem here is that pci_enable_msi() succeeds, but it probably
shouldn't. I don't know all the details about MSI, but doesn't the
CPU
or (L)APIC have to support it? In this case, it's a P200MMX on a 430FX
chipset board. Both quite ancient...

So given that the PCI device itself supports MSI, how do we tell that
it shouldn't actually get turned on?

  -ilia
>
> On 2014/7/4 8:35, Brian Becker wrote:
>> I mistakenly only replied to Yijing Wang the first time. Here are the
further details.
>>
>> uname -a: Linux p5-133 3.15.2-p5-133 #1 Thu Jun 26 22:56:27 EDT 2014
i586 GNU/Linux
>>
>> Here is the output from lspci -vvvxxx:
>>
>> root at p5-133:~# cat lspci.txt
>> 00:00.0 Host bridge: Intel Corporation 430FX - 82437FX TSC [Triton I]
(rev 01)
>>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
>>         Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
>>         Latency: 64
>> 00: 86 80 2d 12 06 00 00 22 01 00 00 06 00 40 00 00
>> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 50: 88 00 41 00 00 00 00 03 49 10 55 55 55 05 55 05
>> 60: 08 10 18 20 20 00 00 00 0f 00 00 00 00 00 00 00
>> 70: 00 00 0a 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 00 00 00 00 00 00 00 00
>> f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 20 00 00
>>
>> 00:07.0 ISA bridge: Intel Corporation 82371FB PIIX ISA [Triton I] (rev
02)
>>         Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
>>         Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Latency: 0
>> 00: 86 80 2e 12 0f 00 80 02 02 00 01 06 00 00 80 00
>> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 40: 00 00 00 00 00 00 00 00 00 00 00 00 4d 00 60 00
>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 60: 0b 0b 0b 09 00 00 00 00 00 f2 05 00 00 00 00 00
>> 70: 0f 80 00 00 00 00 04 04 02 00 00 00 00 00 00 00
>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> a0: 03 00 e0 00 02 d0 00 a0 13 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 00 00 00 00 00 00 00 00
>> f0: 00 00 00 00 00 00 00 00 08 02 00 00 00 00 00 00
>>
>> 00:07.1 IDE interface: Intel Corporation 82371FB PIIX IDE [Triton I]
(rev 02) (prog-if 80 [Master])
>>         Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
>>         Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Latency: 64
>>         Region 0: [virtual] Memory at 000001f0 (32-bit,
non-prefetchable) [size=8]
>>         Region 1: [virtual] Memory at 000003f0 (type 3,
non-prefetchable) [size=1]
>>         Region 2: [virtual] Memory at 00000170 (32-bit,
non-prefetchable) [size=8]
>>         Region 3: [virtual] Memory at 00000370 (type 3,
non-prefetchable) [size=1]
>>         Region 4: I/O ports at ef80 [size=16]
>>         Kernel driver in use: pata_oldpiix
>> 00: 86 80 30 12 05 00 80 02 02 80 01 01 00 40 00 00
>> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 20: 81 ef 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 40: 36 a3 07 a3 00 00 00 00 00 00 00 00 00 00 00 00
>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 00 00 00 00 00 00 00 00
>> f0: 00 00 00 00 00 00 00 00 08 02 00 00 00 00 00 00
>>
>> 00:0e.0 PCI bridge: PLX Technology, Inc. PEX8112 x1 Lane PCI
Express-to-PCI Bridge (rev aa) (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=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Latency: 66, Cache Line Size: 32 bytes
>>
>>         Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
>>         I/O behind bridge: 0000f000-0000ffff
>>         Memory behind bridge: f5e00000-fbffffff
>>         Prefetchable memory behind bridge: d5d00000-f5dfffff
>>         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 2
>>                 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=1/1 Maskable- 64bit+
>>                 Address: 0000000000000000  Data: 0000
>>         Capabilities: [60] Express (v1) PCI/PCI-X to PCI-Express
Bridge, MSI 00
>>                 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s
<64ns, L1 <1us
>>                         ExtTag- RBE- FLReset-
>>                 DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
>>                         RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
BrConfRtry-
>>                         MaxPayload 128 bytes, MaxReadReq 512 bytes
>>                 DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq-
AuxPwr- TransPend-
>>                 LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1,
Latency L0 <1us, L1 <16us
>>                         ClockPM- Surprise- LLActRep- BwNot-
>>                 LnkCtl: ASPM Disabled; Disabled- Retrain- CommClk-
>>                         ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
>>                 LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk-
DLActive- BWMgmt- ABWMgmt-
>> 00: b5 10 12 81 17 01 30 02 aa 00 04 06 08 42 01 00
>> 10: 00 00 00 00 00 00 00 00 00 01 01 00 f0 f0 00 00
>> 20: e0 f5 f0 fb d0 d5 d0 f5 00 00 00 00 00 00 00 00
>> 30: 00 00 00 00 40 00 00 00 00 00 00 00 00 01 0b 00
>> 40: 01 50 02 5a 00 00 00 00 10 28 0e 00 00 00 00 00
>> 50: 05 60 80 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 60: 10 00 81 00 00 00 00 00 00 20 00 00 11 4c 02 00
>> 70: 00 00 11 00 80 0c 00 00 00 00 40 00 00 00 00 00
>> 80: 00 00 00 00 00 00 00 00 33 00 00 00 00 00 00 00
>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>
>> 00:0f.0 USB controller: ULi Electronics Inc. USB 1.1 Controller (rev
03) (prog-if 10 [OHCI])
>>         Subsystem: ULi Electronics Inc. ASRock 939Dual-SATA2
Motherboard
>>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
>>         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Latency: 64 (20000ns max), Cache Line Size: 32 bytes
>>         Interrupt: pin B routed to IRQ 9
>>         Region 0: Memory at ffbeb000 (32-bit, non-prefetchable)
[size=4K]
>>         Capabilities: [60] Power Management version 2
>>                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0+,D1+,D2-,D3hot+,D3cold+)
>>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
>>         Kernel driver in use: ohci-pci
>> 00: b9 10 37 52 17 01 b0 02 03 10 03 0c 08 40 80 00
>> 10: 00 b0 be ff 00 00 00 00 00 00 00 00 00 00 00 00
>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 b9 10 37 52
>> 30: 00 00 00 00 60 00 00 00 00 00 00 00 09 02 00 50
>> 40: 00 00 1f 00 e0 02 00 00 00 00 00 00 00 00 00 00
>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 60: 01 00 02 d8 00 00 00 00 00 00 00 00 00 00 00 00
>> 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>
>> 00:0f.1 USB controller: ULi Electronics Inc. USB 1.1 Controller (rev
03) (prog-if 10 [OHCI])
>>         Subsystem: ULi Electronics Inc. ASRock 939Dual-SATA2
Motherboard
>>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
>>         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Latency: 64 (20000ns max), Cache Line Size: 32 bytes
>>         Interrupt: pin C routed to IRQ 11
>>         Region 0: Memory at ffbec000 (32-bit, non-prefetchable)
[size=4K]
>>         Capabilities: [60] Power Management version 2
>>                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0+,D1+,D2-,D3hot+,D3cold+)
>>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
>>         Kernel driver in use: ohci-pci
>> 00: b9 10 37 52 17 01 b0 02 03 10 03 0c 08 40 80 00
>> 10: 00 c0 be ff 00 00 00 00 00 00 00 00 00 00 00 00
>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 b9 10 37 52
>> 30: 00 00 00 00 60 00 00 00 00 00 00 00 0b 03 00 50
>> 40: 00 00 1f 00 e0 02 00 00 00 00 00 00 00 00 00 00
>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 60: 01 00 02 d8 00 00 00 00 00 00 00 00 00 00 00 00
>> 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>
>> 00:0f.2 USB controller: ULi Electronics Inc. USB 1.1 Controller (rev
03) (prog-if 10 [OHCI])
>>         Subsystem: ULi Electronics Inc. ASRock 939Dual-SATA2
Motherboard
>>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
>>         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Latency: 64 (20000ns max), Cache Line Size: 32 bytes
>>         Interrupt: pin D routed to IRQ 11
>>         Region 0: Memory at ffbed000 (32-bit, non-prefetchable)
[size=4K]
>>         Capabilities: [60] Power Management version 2
>>                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0+,D1+,D2-,D3hot+,D3cold+)
>>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
>>         Kernel driver in use: ohci-pci
>> 00: b9 10 37 52 17 01 b0 02 03 10 03 0c 08 40 80 00
>> 10: 00 d0 be ff 00 00 00 00 00 00 00 00 00 00 00 00
>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 b9 10 37 52
>> 30: 00 00 00 00 60 00 00 00 00 00 00 00 0b 04 00 50
>> 40: 00 00 1f 00 e0 02 00 00 00 00 00 00 00 00 00 00
>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 60: 01 00 02 d8 00 00 00 00 00 00 00 00 00 00 00 00
>> 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>
>> 00:0f.3 USB controller: ULi Electronics Inc. USB 2.0 Controller (rev
01) (prog-if 20 [EHCI])
>>         Subsystem: ULi Electronics Inc. Device 5272
>>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
>>         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Latency: 64 (20000ns max), Cache Line Size: 32 bytes
>>         Interrupt: pin A routed to IRQ 11
>>         Region 0: Memory at ffbefc00 (32-bit, non-prefetchable)
[size=256]
>>         Capabilities: [50] Power Management version 2
>>                 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] Debug port: BAR=1 offset=0090
>>         Kernel driver in use: ehci-pci
>> 00: b9 10 39 52 16 01 b0 02 01 20 03 0c 08 40 80 00
>> 10: 00 fc be ff 00 00 00 00 00 00 00 00 00 00 00 00
>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 b9 10 72 52
>> 30: 00 00 00 00 50 00 00 00 00 00 00 00 0b 01 00 50
>> 40: 01 02 00 ee 00 00 10 c4 00 00 00 00 00 00 00 00
>> 50: 01 58 02 c8 00 00 00 00 0a 00 90 20 00 00 00 00
>> 60: 20 20 7f 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 70: 01 00 00 00 00 00 00 c0 00 00 00 00 00 00 00 00
>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>
>> 00:10.0 RAID bus controller: Silicon Image, Inc. PCI0680 Ultra ATA-133
Host Controller (rev 02)
>>         Subsystem: Silicon Image, Inc. Winic W-680 (Silicon Image 680
based)
>>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
>>         Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Latency: 64, Cache Line Size: 4 bytes
>>         Interrupt: pin A routed to IRQ 9
>>         Region 0: I/O ports at eff0 [size=8]
>>         Region 1: I/O ports at efe4 [size=4]
>>         Region 2: I/O ports at efa8 [size=8]
>>         Region 3: I/O ports at efe0 [size=4]
>>         Region 4: I/O ports at ef90 [size=16]
>>         Region 5: Memory at ffbeec00 (32-bit, non-prefetchable)
[size=256]
>>         [virtual] Expansion ROM at 08000000 [disabled] [size=512K]
>>         Capabilities: [60] Power Management version 2
>>                 Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
>>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=2 PME-
>>         Kernel driver in use: pata_sil680
>> 00: 95 10 80 06 07 01 90 02 02 00 04 01 01 40 00 00
>> 10: f1 ef 00 00 e5 ef 00 00 a9 ef 00 00 e1 ef 00 00
>> 20: 91 ef 00 00 00 ec be ff 00 00 00 00 95 10 80 36
>> 30: 00 00 00 00 60 00 00 00 00 00 00 00 09 01 00 00
>> 40: 00 00 00 00 90 14 19 08 00 00 00 00 00 00 00 00
>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 60: 01 00 22 06 00 40 00 64 00 00 00 00 00 00 00 00
>> 70: 08 00 00 00 00 70 57 07 00 00 00 00 00 00 00 00
>> 80: 03 00 00 00 00 00 00 00 00 00 11 00 d9 7d ff 7b
>> 90: 00 fe 00 0d ff ff ff 3b 33 00 00 19 ff 00 00 00
>> a0: 00 62 c1 10 c1 10 8a 32 c1 10 92 43 07 40 09 40
>> b0: 01 60 8a 32 8a 32 8a 32 92 43 92 43 09 40 09 40
>> c0: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>
>> 01:00.0 VGA compatible controller: NVIDIA Corporation G96 [GeForce 9400
GT] (rev a1) (prog-if 00 [VGA controller])
>>         Subsystem: Jaton Corp Device 0641
>>         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: 32 bytes
>>         Interrupt: pin A routed to IRQ 11
>>         Region 0: Memory at fb000000 (32-bit, non-prefetchable)
[size=16M]
>>         Region 1: Memory at e0000000 (64-bit, prefetchable) [size=256M]
>>         Region 3: Memory at f8000000 (64-bit, non-prefetchable)
[size=32M]
>>         Region 5: I/O ports at fc80 [size=128]
>>
>>         [virtual] Expansion ROM at d5d00000 [disabled] [size=512K]
>>         Capabilities: [60] 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: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
>>                 Address: 0000000000000000  Data: 0000
>>         Capabilities: [78] Express (v1) Endpoint, MSI 00
>>                 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s
<512ns, L1 <4us
>>                         ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
>>                 DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
>>                         RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
>>                         MaxPayload 128 bytes, MaxReadReq 512 bytes
>>                 DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq-
AuxPwr- TransPend-
>>                 LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1,
Latency L0 <512ns, L1 <1us
>>                         ClockPM- Surprise- LLActRep- BwNot-
>>                 LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain-
CommClk-
>>                         ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
>>                 LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+
DLActive- BWMgmt- ABWMgmt-
>>
>>         Capabilities: [b4] Vendor Specific Information: Len=14
<?>
>>         Kernel driver in use: nouveau
>> 00: de 10 41 06 07 01 10 00 a1 00 00 03 08 00 00 00
>> 10: 00 00 00 fb 0c 00 00 e0 00 00 00 00 04 00 00 f8
>> 20: 00 00 00 00 81 fc 00 00 00 00 00 00 13 1b 41 06
>> 30: 00 00 00 00 60 00 00 00 00 00 00 00 0b 01 00 00
>> 40: 13 1b 41 06 00 00 00 00 00 00 00 00 00 00 00 00
>> 50: 01 00 00 00 01 00 00 00 ce d6 23 00 00 00 00 00
>> 60: 01 68 03 00 00 00 00 00 05 78 80 00 00 00 00 00
>> 70: 00 00 00 00 00 00 00 00 10 b4 01 00 e0 84 64 00
>> 80: 10 28 00 00 01 3d 00 00 08 00 11 10 00 00 00 00
>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> b0: 00 00 00 00 09 00 14 01 00 00 00 00 00 00 00 00
>> c0: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>
>>
>>
>> On Thu, Jul 3, 2014 at 1:58 AM, Yijing Wang <wangyijing at
huawei.com <mailto:wangyijing at huawei.com>> wrote:
>>
>>     On 2014/7/3 11:20, Ilia Mirkin wrote:
>>     > Hello,
>>     >
>>     > A user (cc'd) reported that nouveau's enabling of MSI
causes the card
>>     > to not work on his setup [1]. I think the situation is that
MSI is
>>     > just not supported by the underlying motherboard, even though
the
>>     > card, and probably bridge, support it just fine. It's a
very old
>>     > board. The nouveau code does:
>>
>>
>>     What is the kernel version running in your board ?
>>
>>     >
>>     > pmc->use_msi = pci_enable_msi(device->pdev) == 0;
>>
>>     Driver call pci_enable_msi() and always return 0 ?
>>
>>     >
>>     > Does it need to do more checking than that before trying to
enable MSI
>>     > on the device? Could it be that the linux pci subsystem is
missing on
>>     > inheriting MSI capabilities somewhere?
>>
>>     pci_enable_msi() will checking your device whether it supports MSI.
>>     Can you provide the detailed lspci information ? eg. lspci -vvvxxx
?
>>
>>
>>     >
>>     >   -ilia
>>     >
>>     > [1]
>>     >
>>     > 00:00.0 Host bridge [0600]: Intel Corporation 430FX - 82437FX
TSC
>>     > [Triton I] [8086:122d] (rev 01)
>>     >         Flags: bus master, medium devsel, latency 64
>>     >
>>     > 00:0e.0 PCI bridge [0604]: PLX Technology, Inc. PEX8112 x1
Lane PCI
>>     > Express-to-PCI Bridge [10b5:8112] (rev aa) (prog-if 00 [Normal
>>     > decode])
>>     >         Flags: bus master, 66MHz, medium devsel, latency 66
>>     >         Bus: primary=00, secondary=01, subordinate=01,
sec-latency=0
>>     >         I/O behind bridge: 0000f000-0000ffff
>>     >         Memory behind bridge: f5e00000-fbffffff
>>     >         Prefetchable memory behind bridge: d5d00000-f5dfffff
>>     >         Capabilities: [40] Power Management version 2
>>     >         Capabilities: [50] MSI: Enable- Count=1/1 Maskable-
64bit+
>>     >         Capabilities: [60] Express PCI/PCI-X to PCI-Express
Bridge, MSI 00
>>     >
>>     > 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation
G96
>>     > [GeForce 9400 GT] [10de:0641] (rev a1) (prog-if 00 [VGA
controller])
>>     >         Subsystem: Jaton Corp Device [1b13:0641]
>>     >         Flags: bus master, fast devsel, latency 0, IRQ 11
>>     >         Memory at fb000000 (32-bit, non-prefetchable)
[size=16M]
>>     >         Memory at e0000000 (64-bit, prefetchable) [size=256M]
>>     >         Memory at f8000000 (64-bit, non-prefetchable)
[size=32M]
>>     >         I/O ports at fc80 [size=128]
>>     >         [virtual] Expansion ROM at d5d00000 [disabled]
[size=512K]
>>     >         Capabilities: [60] Power Management version 3
>>     >         Capabilities: [68] MSI: Enable- Count=1/1 Maskable-
64bit+
>>     >         Capabilities: [78] Express Endpoint, MSI 00
>>     >         Capabilities: [b4] Vendor Specific Information: Len=14
<?>
>>     >         Kernel driver in use: nouveau
>>     > --
>>     > To unsubscribe from this list: send the line "unsubscribe
linux-pci" in
>>     > the body of a message to majordomo at vger.kernel.org
<mailto:majordomo at vger.kernel.org>
>>     > More majordomo info at 
http://vger.kernel.org/majordomo-info.html
>>     >
>>     >
>>
>>
>>     --
>>     Thanks!
>>     Yijing
>>
>>
>
>
> --
> Thanks!
> Yijing
>

Yijing Wang

2014-Jul-04 03:09 UTC

head link

[Nouveau] How to check for proper MSI support?

On 2014/7/4 10:43, Ilia Mirkin wrote:> On Thu, Jul 3, 2014 at 10:35 PM, Yijing Wang <wangyijing at
huawei.com> wrote:
>> Hi Brian,
>>    From your 01:00.0 VGA compatible controller PCI config register, it
supports 1 MSI vector, so I think this
>> card has no problem. But you didn't answer what's the
pci_enable_msi() return during it enable MSI fail.
>>
>> You can check PCI bus whether support MSI like:
>>
>> cat /sys/bus/pci/devices/00:0e.0/msi_bus
>>
>> Other, do you call pci_enable_device() before pci_enable_msi() ?
> 
> Yes, the device is enabled. nouveau does generally work for most
> people :) And it works fine here if MSI is forced off.
>
> The problem here is that pci_enable_msi() succeeds, but it probably
It's some strange, pci_enable_msi() succeeds, but there is nothing in MSI
address and data register

        Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
Because the address and data is invalid, so MSI can not work.

Because you said pci_enable_msi() return 0 which indicates success, so I guess
the device
current power state is not D0, because checking code in __write_msi_msi.

void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
{
    if (entry->dev->current_state != PCI_D0) {
        /* Don't touch the hardware now */
    } else if (entry->msi_attrib.is_msix) {
        void __iomem *base;
        base = entry->mask_base +
            entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;

        writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR);
        writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
        writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
    ......
> shouldn't. I don't know all the details about MSI, but doesn't
the CPU
> or (L)APIC have to support it? In this case, it's a P200MMX on a 430FX
> chipset board. Both quite ancient...
MSI in x86 always send to specific interrupt address(0xfeexxxx), most x86 CPU
should support MSI, but I am not sure, I don't know hardware much.
> 
> So given that the PCI device itself supports MSI, how do we tell that
> it shouldn't actually get turned on?
Generally, some message in dmesg like:
[   17.322311] ahci 0000:00:1f.2: irq 119 for MSI/MSI-X
[   17.322319] ahci 0000:00:1f.2: irq 120 for MSI/MSI-X
[   17.322326] ahci 0000:00:1f.2: irq 121 for MSI/MSI-X
[   17.322333] ahci 0000:00:1f.2: irq 122 for MSI/MSI-X
[   17.322339] ahci 0000:00:1f.2: irq 123 for MSI/MSI-X

Also you can check /proc/interrupts I think.
> 
>   -ilia
> 
>>
>> On 2014/7/4 8:35, Brian Becker wrote:
>>> I mistakenly only replied to Yijing Wang the first time. Here are
the further details.
>>>
>>> uname -a: Linux p5-133 3.15.2-p5-133 #1 Thu Jun 26 22:56:27 EDT
2014 i586 GNU/Linux
>>>
>>> Here is the output from lspci -vvvxxx:
>>>
>>> root at p5-133:~# cat lspci.txt
>>> 00:00.0 Host bridge: Intel Corporation 430FX - 82437FX TSC [Triton
I] (rev 01)
>>>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
>>>         Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
>>>         Latency: 64
>>> 00: 86 80 2d 12 06 00 00 22 01 00 00 06 00 40 00 00
>>> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 50: 88 00 41 00 00 00 00 03 49 10 55 55 55 05 55 05
>>> 60: 08 10 18 20 20 00 00 00 0f 00 00 00 00 00 00 00
>>> 70: 00 00 0a 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 00 00 00 00 00 00 00 00
>>> f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 20 00 00
>>>
>>> 00:07.0 ISA bridge: Intel Corporation 82371FB PIIX ISA [Triton I]
(rev 02)
>>>         Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
>>>         Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>>         Latency: 0
>>> 00: 86 80 2e 12 0f 00 80 02 02 00 01 06 00 00 80 00
>>> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 40: 00 00 00 00 00 00 00 00 00 00 00 00 4d 00 60 00
>>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 60: 0b 0b 0b 09 00 00 00 00 00 f2 05 00 00 00 00 00
>>> 70: 0f 80 00 00 00 00 04 04 02 00 00 00 00 00 00 00
>>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> a0: 03 00 e0 00 02 d0 00 a0 13 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 00 00 00 00 00 00 00 00
>>> f0: 00 00 00 00 00 00 00 00 08 02 00 00 00 00 00 00
>>>
>>> 00:07.1 IDE interface: Intel Corporation 82371FB PIIX IDE [Triton
I] (rev 02) (prog-if 80 [Master])
>>>         Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
>>>         Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>>         Latency: 64
>>>         Region 0: [virtual] Memory at 000001f0 (32-bit,
non-prefetchable) [size=8]
>>>         Region 1: [virtual] Memory at 000003f0 (type 3,
non-prefetchable) [size=1]
>>>         Region 2: [virtual] Memory at 00000170 (32-bit,
non-prefetchable) [size=8]
>>>         Region 3: [virtual] Memory at 00000370 (type 3,
non-prefetchable) [size=1]
>>>         Region 4: I/O ports at ef80 [size=16]
>>>         Kernel driver in use: pata_oldpiix
>>> 00: 86 80 30 12 05 00 80 02 02 80 01 01 00 40 00 00
>>> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 20: 81 ef 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 40: 36 a3 07 a3 00 00 00 00 00 00 00 00 00 00 00 00
>>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 00 00 00 00 00 00 00 00
>>> f0: 00 00 00 00 00 00 00 00 08 02 00 00 00 00 00 00
>>>
>>> 00:0e.0 PCI bridge: PLX Technology, Inc. PEX8112 x1 Lane PCI
Express-to-PCI Bridge (rev aa) (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=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>>         Latency: 66, Cache Line Size: 32 bytes
>>>
>>>         Bus: primary=00, secondary=01, subordinate=01,
sec-latency=0
>>>         I/O behind bridge: 0000f000-0000ffff
>>>         Memory behind bridge: f5e00000-fbffffff
>>>         Prefetchable memory behind bridge: d5d00000-f5dfffff
>>>         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 2
>>>                 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=1/1 Maskable- 64bit+
>>>                 Address: 0000000000000000  Data: 0000
>>>         Capabilities: [60] Express (v1) PCI/PCI-X to PCI-Express
Bridge, MSI 00
>>>                 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency
L0s <64ns, L1 <1us
>>>                         ExtTag- RBE- FLReset-
>>>                 DevCtl: Report errors: Correctable- Non-Fatal-
Fatal- Unsupported-
>>>                         RlxdOrd- ExtTag- PhantFunc- AuxPwr-
NoSnoop- BrConfRtry-
>>>                         MaxPayload 128 bytes, MaxReadReq 512 bytes
>>>                 DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq-
AuxPwr- TransPend-
>>>                 LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s
L1, Latency L0 <1us, L1 <16us
>>>                         ClockPM- Surprise- LLActRep- BwNot-
>>>                 LnkCtl: ASPM Disabled; Disabled- Retrain- CommClk-
>>>                         ExtSynch- ClockPM- AutWidDis- BWInt-
AutBWInt-
>>>                 LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train-
SlotClk- DLActive- BWMgmt- ABWMgmt-
>>> 00: b5 10 12 81 17 01 30 02 aa 00 04 06 08 42 01 00
>>> 10: 00 00 00 00 00 00 00 00 00 01 01 00 f0 f0 00 00
>>> 20: e0 f5 f0 fb d0 d5 d0 f5 00 00 00 00 00 00 00 00
>>> 30: 00 00 00 00 40 00 00 00 00 00 00 00 00 01 0b 00
>>> 40: 01 50 02 5a 00 00 00 00 10 28 0e 00 00 00 00 00
>>> 50: 05 60 80 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 60: 10 00 81 00 00 00 00 00 00 20 00 00 11 4c 02 00
>>> 70: 00 00 11 00 80 0c 00 00 00 00 40 00 00 00 00 00
>>> 80: 00 00 00 00 00 00 00 00 33 00 00 00 00 00 00 00
>>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>>
>>> 00:0f.0 USB controller: ULi Electronics Inc. USB 1.1 Controller
(rev 03) (prog-if 10 [OHCI])
>>>         Subsystem: ULi Electronics Inc. ASRock 939Dual-SATA2
Motherboard
>>>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
>>>         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>>         Latency: 64 (20000ns max), Cache Line Size: 32 bytes
>>>         Interrupt: pin B routed to IRQ 9
>>>         Region 0: Memory at ffbeb000 (32-bit, non-prefetchable)
[size=4K]
>>>         Capabilities: [60] Power Management version 2
>>>                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0+,D1+,D2-,D3hot+,D3cold+)
>>>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0
PME-
>>>         Kernel driver in use: ohci-pci
>>> 00: b9 10 37 52 17 01 b0 02 03 10 03 0c 08 40 80 00
>>> 10: 00 b0 be ff 00 00 00 00 00 00 00 00 00 00 00 00
>>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 b9 10 37 52
>>> 30: 00 00 00 00 60 00 00 00 00 00 00 00 09 02 00 50
>>> 40: 00 00 1f 00 e0 02 00 00 00 00 00 00 00 00 00 00
>>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 60: 01 00 02 d8 00 00 00 00 00 00 00 00 00 00 00 00
>>> 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>>
>>> 00:0f.1 USB controller: ULi Electronics Inc. USB 1.1 Controller
(rev 03) (prog-if 10 [OHCI])
>>>         Subsystem: ULi Electronics Inc. ASRock 939Dual-SATA2
Motherboard
>>>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
>>>         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>>         Latency: 64 (20000ns max), Cache Line Size: 32 bytes
>>>         Interrupt: pin C routed to IRQ 11
>>>         Region 0: Memory at ffbec000 (32-bit, non-prefetchable)
[size=4K]
>>>         Capabilities: [60] Power Management version 2
>>>                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0+,D1+,D2-,D3hot+,D3cold+)
>>>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0
PME-
>>>         Kernel driver in use: ohci-pci
>>> 00: b9 10 37 52 17 01 b0 02 03 10 03 0c 08 40 80 00
>>> 10: 00 c0 be ff 00 00 00 00 00 00 00 00 00 00 00 00
>>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 b9 10 37 52
>>> 30: 00 00 00 00 60 00 00 00 00 00 00 00 0b 03 00 50
>>> 40: 00 00 1f 00 e0 02 00 00 00 00 00 00 00 00 00 00
>>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 60: 01 00 02 d8 00 00 00 00 00 00 00 00 00 00 00 00
>>> 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>>
>>> 00:0f.2 USB controller: ULi Electronics Inc. USB 1.1 Controller
(rev 03) (prog-if 10 [OHCI])
>>>         Subsystem: ULi Electronics Inc. ASRock 939Dual-SATA2
Motherboard
>>>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
>>>         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>>         Latency: 64 (20000ns max), Cache Line Size: 32 bytes
>>>         Interrupt: pin D routed to IRQ 11
>>>         Region 0: Memory at ffbed000 (32-bit, non-prefetchable)
[size=4K]
>>>         Capabilities: [60] Power Management version 2
>>>                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0+,D1+,D2-,D3hot+,D3cold+)
>>>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0
PME-
>>>         Kernel driver in use: ohci-pci
>>> 00: b9 10 37 52 17 01 b0 02 03 10 03 0c 08 40 80 00
>>> 10: 00 d0 be ff 00 00 00 00 00 00 00 00 00 00 00 00
>>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 b9 10 37 52
>>> 30: 00 00 00 00 60 00 00 00 00 00 00 00 0b 04 00 50
>>> 40: 00 00 1f 00 e0 02 00 00 00 00 00 00 00 00 00 00
>>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 60: 01 00 02 d8 00 00 00 00 00 00 00 00 00 00 00 00
>>> 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>>
>>> 00:0f.3 USB controller: ULi Electronics Inc. USB 2.0 Controller
(rev 01) (prog-if 20 [EHCI])
>>>         Subsystem: ULi Electronics Inc. Device 5272
>>>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
>>>         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>>         Latency: 64 (20000ns max), Cache Line Size: 32 bytes
>>>         Interrupt: pin A routed to IRQ 11
>>>         Region 0: Memory at ffbefc00 (32-bit, non-prefetchable)
[size=256]
>>>         Capabilities: [50] Power Management version 2
>>>                 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] Debug port: BAR=1 offset=0090
>>>         Kernel driver in use: ehci-pci
>>> 00: b9 10 39 52 16 01 b0 02 01 20 03 0c 08 40 80 00
>>> 10: 00 fc be ff 00 00 00 00 00 00 00 00 00 00 00 00
>>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 b9 10 72 52
>>> 30: 00 00 00 00 50 00 00 00 00 00 00 00 0b 01 00 50
>>> 40: 01 02 00 ee 00 00 10 c4 00 00 00 00 00 00 00 00
>>> 50: 01 58 02 c8 00 00 00 00 0a 00 90 20 00 00 00 00
>>> 60: 20 20 7f 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 70: 01 00 00 00 00 00 00 c0 00 00 00 00 00 00 00 00
>>> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> a0: 00 00 00 00 00 00 00 00 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: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>>
>>> 00:10.0 RAID bus controller: Silicon Image, Inc. PCI0680 Ultra
ATA-133 Host Controller (rev 02)
>>>         Subsystem: Silicon Image, Inc. Winic W-680 (Silicon Image
680 based)
>>>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
>>>         Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>>         Latency: 64, Cache Line Size: 4 bytes
>>>         Interrupt: pin A routed to IRQ 9
>>>         Region 0: I/O ports at eff0 [size=8]
>>>         Region 1: I/O ports at efe4 [size=4]
>>>         Region 2: I/O ports at efa8 [size=8]
>>>         Region 3: I/O ports at efe0 [size=4]
>>>         Region 4: I/O ports at ef90 [size=16]
>>>         Region 5: Memory at ffbeec00 (32-bit, non-prefetchable)
[size=256]
>>>         [virtual] Expansion ROM at 08000000 [disabled] [size=512K]
>>>         Capabilities: [60] Power Management version 2
>>>                 Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
>>>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=2
PME-
>>>         Kernel driver in use: pata_sil680
>>> 00: 95 10 80 06 07 01 90 02 02 00 04 01 01 40 00 00
>>> 10: f1 ef 00 00 e5 ef 00 00 a9 ef 00 00 e1 ef 00 00
>>> 20: 91 ef 00 00 00 ec be ff 00 00 00 00 95 10 80 36
>>> 30: 00 00 00 00 60 00 00 00 00 00 00 00 09 01 00 00
>>> 40: 00 00 00 00 90 14 19 08 00 00 00 00 00 00 00 00
>>> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 60: 01 00 22 06 00 40 00 64 00 00 00 00 00 00 00 00
>>> 70: 08 00 00 00 00 70 57 07 00 00 00 00 00 00 00 00
>>> 80: 03 00 00 00 00 00 00 00 00 00 11 00 d9 7d ff 7b
>>> 90: 00 fe 00 0d ff ff ff 3b 33 00 00 19 ff 00 00 00
>>> a0: 00 62 c1 10 c1 10 8a 32 c1 10 92 43 07 40 09 40
>>> b0: 01 60 8a 32 8a 32 8a 32 92 43 92 43 09 40 09 40
>>> c0: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>>
>>> 01:00.0 VGA compatible controller: NVIDIA Corporation G96 [GeForce
9400 GT] (rev a1) (prog-if 00 [VGA controller])
>>>         Subsystem: Jaton Corp Device 0641
>>>         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: 32 bytes
>>>         Interrupt: pin A routed to IRQ 11
>>>         Region 0: Memory at fb000000 (32-bit, non-prefetchable)
[size=16M]
>>>         Region 1: Memory at e0000000 (64-bit, prefetchable)
[size=256M]
>>>         Region 3: Memory at f8000000 (64-bit, non-prefetchable)
[size=32M]
>>>         Region 5: I/O ports at fc80 [size=128]
>>>
>>>         [virtual] Expansion ROM at d5d00000 [disabled] [size=512K]
>>>         Capabilities: [60] 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: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
>>>                 Address: 0000000000000000  Data: 0000
>>>         Capabilities: [78] Express (v1) Endpoint, MSI 00
>>>                 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency
L0s <512ns, L1 <4us
>>>                         ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+
FLReset-
>>>                 DevCtl: Report errors: Correctable- Non-Fatal-
Fatal- Unsupported-
>>>                         RlxdOrd+ ExtTag- PhantFunc- AuxPwr-
NoSnoop+
>>>                         MaxPayload 128 bytes, MaxReadReq 512 bytes
>>>                 DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq-
AuxPwr- TransPend-
>>>                 LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s
L1, Latency L0 <512ns, L1 <1us
>>>                         ClockPM- Surprise- LLActRep- BwNot-
>>>                 LnkCtl: ASPM Disabled; RCB 128 bytes Disabled-
Retrain- CommClk-
>>>                         ExtSynch- ClockPM- AutWidDis- BWInt-
AutBWInt-
>>>                 LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train-
SlotClk+ DLActive- BWMgmt- ABWMgmt-
>>>
>>>         Capabilities: [b4] Vendor Specific Information: Len=14
<?>
>>>         Kernel driver in use: nouveau
>>> 00: de 10 41 06 07 01 10 00 a1 00 00 03 08 00 00 00
>>> 10: 00 00 00 fb 0c 00 00 e0 00 00 00 00 04 00 00 f8
>>> 20: 00 00 00 00 81 fc 00 00 00 00 00 00 13 1b 41 06
>>> 30: 00 00 00 00 60 00 00 00 00 00 00 00 0b 01 00 00
>>> 40: 13 1b 41 06 00 00 00 00 00 00 00 00 00 00 00 00
>>> 50: 01 00 00 00 01 00 00 00 ce d6 23 00 00 00 00 00
>>> 60: 01 68 03 00 00 00 00 00 05 78 80 00 00 00 00 00
>>> 70: 00 00 00 00 00 00 00 00 10 b4 01 00 e0 84 64 00
>>> 80: 10 28 00 00 01 3d 00 00 08 00 11 10 00 00 00 00
>>> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> b0: 00 00 00 00 09 00 14 01 00 00 00 00 00 00 00 00
>>> c0: 00 00 00 00 00 00 00 00 00 00 00 00 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 00 00 00 00 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
>>>
>>>
>>>
>>> On Thu, Jul 3, 2014 at 1:58 AM, Yijing Wang <wangyijing at
huawei.com <mailto:wangyijing at huawei.com>> wrote:
>>>
>>>     On 2014/7/3 11:20, Ilia Mirkin wrote:
>>>     > Hello,
>>>     >
>>>     > A user (cc'd) reported that nouveau's enabling of
MSI causes the card
>>>     > to not work on his setup [1]. I think the situation is
that MSI is
>>>     > just not supported by the underlying motherboard, even
though the
>>>     > card, and probably bridge, support it just fine. It's
a very old
>>>     > board. The nouveau code does:
>>>
>>>
>>>     What is the kernel version running in your board ?
>>>
>>>     >
>>>     > pmc->use_msi = pci_enable_msi(device->pdev) == 0;
>>>
>>>     Driver call pci_enable_msi() and always return 0 ?
>>>
>>>     >
>>>     > Does it need to do more checking than that before trying
to enable MSI
>>>     > on the device? Could it be that the linux pci subsystem is
missing on
>>>     > inheriting MSI capabilities somewhere?
>>>
>>>     pci_enable_msi() will checking your device whether it supports
MSI.
>>>     Can you provide the detailed lspci information ? eg. lspci
-vvvxxx ?
>>>
>>>
>>>     >
>>>     >   -ilia
>>>     >
>>>     > [1]
>>>     >
>>>     > 00:00.0 Host bridge [0600]: Intel Corporation 430FX -
82437FX TSC
>>>     > [Triton I] [8086:122d] (rev 01)
>>>     >         Flags: bus master, medium devsel, latency 64
>>>     >
>>>     > 00:0e.0 PCI bridge [0604]: PLX Technology, Inc. PEX8112 x1
Lane PCI
>>>     > Express-to-PCI Bridge [10b5:8112] (rev aa) (prog-if 00
[Normal
>>>     > decode])
>>>     >         Flags: bus master, 66MHz, medium devsel, latency
66
>>>     >         Bus: primary=00, secondary=01, subordinate=01,
sec-latency=0
>>>     >         I/O behind bridge: 0000f000-0000ffff
>>>     >         Memory behind bridge: f5e00000-fbffffff
>>>     >         Prefetchable memory behind bridge:
d5d00000-f5dfffff
>>>     >         Capabilities: [40] Power Management version 2
>>>     >         Capabilities: [50] MSI: Enable- Count=1/1
Maskable- 64bit+
>>>     >         Capabilities: [60] Express PCI/PCI-X to
PCI-Express Bridge, MSI 00
>>>     >
>>>     > 01:00.0 VGA compatible controller [0300]: NVIDIA
Corporation G96
>>>     > [GeForce 9400 GT] [10de:0641] (rev a1) (prog-if 00 [VGA
controller])
>>>     >         Subsystem: Jaton Corp Device [1b13:0641]
>>>     >         Flags: bus master, fast devsel, latency 0, IRQ 11
>>>     >         Memory at fb000000 (32-bit, non-prefetchable)
[size=16M]
>>>     >         Memory at e0000000 (64-bit, prefetchable)
[size=256M]
>>>     >         Memory at f8000000 (64-bit, non-prefetchable)
[size=32M]
>>>     >         I/O ports at fc80 [size=128]
>>>     >         [virtual] Expansion ROM at d5d00000 [disabled]
[size=512K]
>>>     >         Capabilities: [60] Power Management version 3
>>>     >         Capabilities: [68] MSI: Enable- Count=1/1
Maskable- 64bit+
>>>     >         Capabilities: [78] Express Endpoint, MSI 00
>>>     >         Capabilities: [b4] Vendor Specific Information:
Len=14 <?>
>>>     >         Kernel driver in use: nouveau
>>>     > --
>>>     > To unsubscribe from this list: send the line
"unsubscribe linux-pci" in
>>>     > the body of a message to majordomo at vger.kernel.org
<mailto:majordomo at vger.kernel.org>
>>>     > More majordomo info at 
http://vger.kernel.org/majordomo-info.html
>>>     >
>>>     >
>>>
>>>
>>>     --
>>>     Thanks!
>>>     Yijing
>>>
>>>
>>
>>
>> --
>> Thanks!
>> Yijing
>>
> 
> .
> 

-- 
Thanks!
Yijing

Ilia Mirkin

2014-Jul-04 03:30 UTC

head link

[Nouveau] How to check for proper MSI support?

On Thu, Jul 3, 2014 at 11:09 PM, Yijing Wang <wangyijing at huawei.com>
wrote:> On 2014/7/4 10:43, Ilia Mirkin wrote:
>> On Thu, Jul 3, 2014 at 10:35 PM, Yijing Wang <wangyijing at
huawei.com> wrote:
>>> Hi Brian,
>>>    From your 01:00.0 VGA compatible controller PCI config register,
it supports 1 MSI vector, so I think this
>>> card has no problem. But you didn't answer what's the
pci_enable_msi() return during it enable MSI fail.
>>>
>>> You can check PCI bus whether support MSI like:
>>>
>>> cat /sys/bus/pci/devices/00:0e.0/msi_bus
>>>
>>> Other, do you call pci_enable_device() before pci_enable_msi() ?
>>
>> Yes, the device is enabled. nouveau does generally work for most
>> people :) And it works fine here if MSI is forced off.
>>
>> The problem here is that pci_enable_msi() succeeds, but it probably
>
> It's some strange, pci_enable_msi() succeeds, but there is nothing in
MSI address and data register
>
>         Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
>                 Address: 0000000000000000  Data: 0000
> Because the address and data is invalid, so MSI can not work.
>
> Because you said pci_enable_msi() return 0 which indicates success, so I
guess the device
> current power state is not D0, because checking code in __write_msi_msi.
>
> void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> {
>     if (entry->dev->current_state != PCI_D0) {
>         /* Don't touch the hardware now */
>     } else if (entry->msi_attrib.is_msix) {
>         void __iomem *base;
>         base = entry->mask_base +
>             entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
>
>         writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR);
>         writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
>         writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
>     ......
>
>> shouldn't. I don't know all the details about MSI, but
doesn't the CPU
>> or (L)APIC have to support it? In this case, it's a P200MMX on a
430FX
>> chipset board. Both quite ancient...
>
> MSI in x86 always send to specific interrupt address(0xfeexxxx), most x86
CPU
> should support MSI, but I am not sure, I don't know hardware much.
To put things in perspective, P200MMX was released in early 1997. It
looks like the PCI 2.2 spec, which defines MSI, was released in late
1998. The 430FX chipset only supports PCI 2.0.
>
>>
>> So given that the PCI device itself supports MSI, how do we tell that
>> it shouldn't actually get turned on?
>
> Generally, some message in dmesg like:
> [   17.322311] ahci 0000:00:1f.2: irq 119 for MSI/MSI-X
> [   17.322319] ahci 0000:00:1f.2: irq 120 for MSI/MSI-X
> [   17.322326] ahci 0000:00:1f.2: irq 121 for MSI/MSI-X
> [   17.322333] ahci 0000:00:1f.2: irq 122 for MSI/MSI-X
> [   17.322339] ahci 0000:00:1f.2: irq 123 for MSI/MSI-X
>
> Also you can check /proc/interrupts I think.
I must not have made my question clear. Let me try again:

There is a NVIDIA G96 GPU (which is PCIe only) hanging off of a PCIe
<-> PCI bridge (all on one card), which is plugged into a motherboard
with the 430FX chipset (PCI 2.0 supported).

The GPU PCI device, of course, has full support for MSI. However my
understanding is that MSI won't actually work here. This is confirmed
by the fact that if we let nouveau enable MSI, the device doesn't work
(presumably due to lack of interrupt delivery, although I admit to not
having debugged it that far). How do I, as a nouveau driver developer,
know not to call pci_enable_msi? Or alternatively how can
pci_enable_msi be taught not to succeed in this case?

Thanks,

  -ilia

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