Re: AGP cards in PCI mode (fake slots like AGPro, AGP Express, AGI, AGX, XGP)

From: Alex Deucher
Date: Sun Sep 13 2015 - 22:32:14 EST

On Sun, Sep 13, 2015 at 2:57 PM, Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx> wrote:
> Hello,
> I have a PC Chips A31G board with AGPro slot and found that nouveau does not
> work properly with it. Console works but reverts to software mode, X11 hangs
> with mouse cursor only.
>
> The slot is physically AGP 1.5V but is wired to PCI bus as the chipset (SiS
> 761) does not support AGP cards. To further complicate things, the chipset has
> AGP capability - but only for the integrated video. You can see that in the
> lspci output below - the AGP card is on bus 0 and SiS card on bus 1 (AGP bus
> behind the AGP bridge). The SiS card is not used (can be disabled in BIOS but
> it does not improve things - as the AGP capability of the host bridge remains
> active).
>
> As seen in dmesg below, kernel tries to set AGP 8x mode for all AGP devices,
> including the AGP 4x TNT2 card which is not even connected to the AGP bridge.
>
> Setting nouveau.agpmode=0 makes it work but how can we make this case work
> automatically?
>
> Radeon driver does some "ring test" and if it fails, it disables AGP mode and
> retries. That seems to work a bit (with R7000 but not with R7200).

You can boot with radeon.agpmode=-1 to force pci mode.

Alex

>
> But I think that we shouldn't even touch the AGP registers of other devices
> in this case as it might break the integrated video.
> But how can we know that the card is connected to the AGP bus? There does not
> seem to be a reliable way...
>
> dmesg:
> [ 22.015411] nouveau [ DEVICE][0000:00:05.0] BOOT0 : 0x20154000
> [ 22.015473] nouveau [ DEVICE][0000:00:05.0] Chipset: NV05 (NV05)
> [ 22.015527] nouveau [ DEVICE][0000:00:05.0] Family : NV04
> [ 22.041131] nouveau [ VBIOS][0000:00:05.0] using image from PRAMIN
> [ 22.041194] nouveau [ VBIOS][0000:00:05.0] BMP version 5.6
> [ 22.041382] nouveau [ VBIOS][0000:00:05.0] version 02.05.20.02.00
> [ 22.041561] nouveau W[ VBIOS][0000:00:05.0] DCB table not found
> [ 22.041867] nouveau W[ VBIOS][0000:00:05.0] DCB table not found
> [ 22.042079] nouveau W[ VBIOS][0000:00:05.0] DCB table not found
> [ 22.042133] nouveau W[ VBIOS][0000:00:05.0] DCB table not found
> [ 22.042245] nouveau W[ PTIMER][0000:00:05.0] unknown input clock freq
> [ 22.042306] nouveau [ PFB][0000:00:05.0] RAM type: SDRAM
> [ 22.042360] nouveau [ PFB][0000:00:05.0] RAM size: 32 MiB
> [ 22.042413] nouveau [ PFB][0000:00:05.0] ZCOMP: 0 tags
> [ 22.047063] nouveau [ CLK][0000:00:05.0] --:
> [ 22.047137] nouveau W[ VBIOS][0000:00:05.0] DCB table not found
> [ 22.047220] agpgart-amd64 0000:00:00.0: AGP 3.0 bridge
> [ 22.047281] agpgart: systemd-udevd tried to set rate=x12. Setting to AGP3 x8 mode.
> [ 22.047348] agpgart-amd64 0000:00:00.0: putting AGP V3 device into 8x mode
> [ 22.047425] nouveau 0000:00:05.0: putting AGP V3 device into 8x mode
> [ 22.047503] pci 0000:01:00.0: putting AGP V3 device into 8x mode
> [ 22.047632] [TTM] Zone kernel: Available graphics memory: 239112 kiB
> [ 22.047685] [TTM] Initializing pool allocator
> [ 22.047744] [TTM] Initializing DMA pool allocator
> [ 22.047814] nouveau [ DRM] VRAM: 31 MiB
> [ 22.047865] nouveau [ DRM] GART: 64 MiB
> [ 22.047918] nouveau [ DRM] BMP version 5.6
> [ 22.047971] nouveau W[ DRM] No DCB data found in VBIOS
> [ 22.051250] nouveau [ DRM] Saving VGA fonts
> [ 22.099912] nouveau W[ DRM] No DCB data found in VBIOS
> [ 22.101006] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> [ 22.101061] [drm] Driver supports precise vblank timestamp query.
> [ 22.102645] nouveau [ DRM] MM: using M2MF for buffer copies
> [ 22.133344] nouveau [ DRM] allocated 1280x1024 fb: 0x4000, bo db2d6c00
> [ 22.133545] fbcon: nouveaufb (fb0) is primary device
> [ 22.369387] nouveau E[ DRM] GPU lockup - switching to software fbcon
> [ 22.378443] Console: switching to colour frame buffer device 160x64
> [ 22.395704] nouveau 0000:00:05.0: fb0: nouveaufb frame buffer device
> [ 22.395808] nouveau 0000:00:05.0: registered panic notifier
> [ 22.396783] [drm] Initialized nouveau 1.2.2 20120801 for 0000:00:05.0 on minor 0
>
> lspci -vvnn:
> 00:00.0 Host bridge [0600]: Silicon Integrated Systems [SiS] 761/M761 Host [1039:0761] (rev 01)
> Subsystem: Elitegroup Computer Systems Device [1019:0131]
> 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: 32
> Region 0: Memory at f0000000 (32-bit, non-prefetchable) [size=64M]
> Capabilities: [a0] AGP version 3.0
> Status: RQ=32 Iso- ArqSz=2 Cal=3 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3+ Rate=x4,x8
> Command: RQ=1 ArqSz=0 Cal=0 SBA+ AGP+ GART64- 64bit- FW- Rate=x8
> Capabilities: [d0] HyperTransport: Slave or Primary Interface
> Command: BaseUnitID=0 UnitCnt=17 MastHost- DefDir- DUL-
> Link Control 0: CFlE- CST- CFE- <LkFail- Init+ EOC- TXO- <CRCErr=0 IsocEn- LSEn- ExtCTL- 64b-
> Link Config 0: MLWI=16bit DwFcIn- MLWO=16bit DwFcOut- LWI=16bit DwFcInEn- LWO=16bit DwFcOutEn-
> Link Control 1: CFlE- CST- CFE- <LkFail+ Init- EOC+ TXO+ <CRCErr=0 IsocEn- LSEn- ExtCTL- 64b-
> Link Config 1: MLWI=N/C DwFcIn- MLWO=N/C DwFcOut- LWI=N/C DwFcInEn- LWO=N/C DwFcOutEn-
> Revision ID: 1.05
> Link Frequency 0: 800MHz
> Link Error 0: <Prot- <Ovfl- <EOC- CTLTm-
> Link Frequency Capability 0: 200MHz+ 300MHz- 400MHz+ 500MHz- 600MHz- 800MHz+ 1.0GHz+ 1.2GHz- 1.4GHz- 1.6GHz- Vend-
> Feature Capability: IsocFC- LDTSTOP+ CRCTM- ECTLT- 64bA+ UIDRD-
> Link Frequency 1: 200MHz
> Link Error 1: <Prot- <Ovfl- <EOC- CTLTm-
> Link Frequency Capability 1: 200MHz- 300MHz- 400MHz- 500MHz- 600MHz- 800MHz- 1.0GHz- 1.2GHz- 1.4GHz- 1.6GHz- Vend-
> Error Handling: PFlE- OFlE- PFE- OFE- EOCFE- RFE- CRCFE- SERRFE- CF- RE- PNFE- ONFE- EOCNFE- RNFE- CRCNFE- SERRNFE-
> Prefetchable memory behind bridge Upper: 00-00
> Bus Number: 00
> Capabilities: [f0] HyperTransport: Interrupt Discovery and Configuration
> Capabilities: [5c] HyperTransport: Revision ID: 1.05
> Kernel driver in use: agpgart-amd64
>
> 00:01.0 PCI bridge [0604]: Silicon Integrated Systems [SiS] AGP Port (virtual PCI-to-PCI bridge) [1039:0002] (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: 64
> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
> I/O behind bridge: 0000e000-0000efff
> Memory behind bridge: feb00000-febfffff
> Prefetchable memory behind bridge: d8000000-dfffffff
> Secondary status: 66MHz+ FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- <SERR- <PERR-
> BridgeCtl: Parity- SERR+ NoISA- VGA- MAbort- >Reset- FastB2B-
> PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
> Capabilities: [a4] HyperTransport: UnitID Clumping
> ...
> 00:05.0 VGA compatible controller [0300]: NVIDIA Corporation NV5 [Riva TNT2 Model 64 / Model 64 Pro] [10de:002d] (rev 15) (prog-if 00 [VGA controller])
> 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 (1250ns min, 250ns max)
> Interrupt: pin A routed to IRQ 16
> Region 0: Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
> Region 1: Memory at d6000000 (32-bit, prefetchable) [size=32M]
> Expansion ROM at feae0000 [disabled] [size=64K]
> Capabilities: [60] Power Management version 1
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
> Capabilities: [44] AGP version 2.0
> Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA- ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2,x4
> Command: RQ=32 ArqSz=0 Cal=0 SBA- AGP+ GART64- 64bit- FW- Rate=x2
> Kernel driver in use: nouveau
> ...
> 01:00.0 VGA compatible controller [0300]: Silicon Integrated Systems [SiS] 661/741/760 PCI/AGP or 662/761Gx PCIE VGA Display Adapter [1039:6330] (rev 03) (prog-if 00 [VGA controller])
> Subsystem: Silicon Integrated Systems [SiS] [M]661xX/[M]741[GX]/[M]760 PCI/AGP VGA Adapter [1039:6330]
> 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-
> Interrupt: pin A routed to IRQ 10
> BIST result: 00
> Region 0: Memory at d8000000 (32-bit, prefetchable) [disabled] [size=128M]
> Region 1: Memory at febe0000 (32-bit, non-prefetchable) [disabled] [size=128K]
> Region 2: I/O ports at e800 [disabled] [size=128]
> 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] AGP version 3.0
> Status: RQ=256 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3+ Rate=x4,x8
> Command: RQ=32 ArqSz=2 Cal=0 SBA+ AGP+ GART64- 64bit- FW- Rate=x8
>
> --
> Ondrej Zary
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