RE: radeon: screen garbled after page allocator change, was: Re: [patch v2 3/3] mm: page_alloc: fair zone allocator policy

28 Apr 2014

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-----Original Message-----
From: Koenig, Christian
Sent: Monday, April 28, 2014 3:30 AM
To: Jerome Glisse; Thomas Schwinge
Cc: Bjorn Helgaas; linux-pci@vger.kernel.org; Johannes Weiner; Mel Gorman;
Rik van Riel; Andrea Arcangeli; Zlatko Calusic; Minchan Kim; linux-
mm@kvack.org; linux-kernel@vger.kernel.org; Andrew Morton; Deucher,
Alexander; dri-devel@lists.freedesktop.org
Subject: Re: radeon: screen garbled after page allocator change, was: Re:
[patch v2 3/3] mm: page_alloc: fair zone allocator policy
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/* We are living in a monstruous world in which you can have the pci
* root complex behind an hypertransport link which can not address

* anything above 32bit (well hypertransport specification says 40bits

* but hardware such as SIS761 only support 32bits).

That looks more like a problem with this specific chipset rather than
something that needs a general solution like this.
Maybe we should rather add the PCI-ID(s) of the thing to some kind of
quirks table for now so that the patch isn't so invasive and we can CC
stable as well?
IIRC, there was someone on IRC with a similar problem with a similar SiS chipset a while back.  These SiS chipsets seem to be generally problematic.
Alex
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Just a thought,
Christian.
Am 27.04.2014 21:55, schrieb Jerome Glisse:
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On Sat, Apr 26, 2014 at 11:31:11PM -0400, Jerome Glisse wrote:
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On Thu, Apr 24, 2014 at 09:37:22AM -0400, Johannes Weiner wrote:
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Hi Thomas,
On Wed, Apr 02, 2014 at 04:26:08PM +0200, Thomas Schwinge wrote:
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Hi!
On Fri,  2 Aug 2013 11:37:26 -0400, Johannes Weiner
hannes@cmpxchg.org wrote:
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Each zone that holds userspace pages of one workload must be aged
at a
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speed proportional to the zone size.  [...]
Fix this with a very simple round robin allocator.  [...]
This patch, adding NR_ALLOC_BATCH, eventually landed in mainline as
commit 81c0a2bb515fd4daae8cab64352877480792b515 (2013-09-11).
I recently upgraded a Debian testing system from a 3.11 kernel to 3.12,
and it started to exhibit "strange" issues, which I then bisected to this
patch.  I'm not saying that the patch is faulty, as it seems to be
working fine for everyone else, so I rather assume that something in a
(vastly?) different corner of the kernel (or my hardware?) is broken.
;-)
The issue is that when X.org/lightdm starts up, there are "garbled"
section on the screen, for example, rectangular boxes that are just
black
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or otherwise "distorted", and/or sets of glyphs (corresponding to a set
of characters; but not all characters) are displayed as rectangular gray
or black boxes, and/or icons in a GNOME session are not displayed
properly, and so on.  (Can take a snapshot if that helps?)  Switching to
a Linux console, I can use that one fine.  Switching back to X, in the
majority of all cases, the screen will be completely black, but with the
mouse cursor still rendered properly (done in hardware, I assume).
Reverting commit 81c0a2bb515fd4daae8cab64352877480792b515, for
example on
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top of v3.12, and everything is back to normal.  The problem also
persists with a v3.14 kernel that I just built.
I will try to figure out what's going on, but will gladly take any
pointers, or suggestions about how to tackle such a problem.
The hardware is a Fujitsu Siemens Esprimo E5600, mainboard D2264-A1,
CPU
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AMD Sempron 3000+.  There is a on-board graphics thingy, but I'm not
using that; instead I put in a Sapphire Radeon HD 4350 card.
I went over this code change repeatedly but I could not see anything
directly that would explain it.  However, this patch DOES change the
way allocations are placed (while still respecting zone specifiers
like __GFP_DMA etc.) and so it's possible that they unearthed a
corruption, or a wrongly set dma mask in the drivers.
Ccing the radeon driver guys.  Full quote follows.
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 $ cat < /proc/cpuinfo
 processor       : 0
 vendor_id       : AuthenticAMD
 cpu family      : 15
 model           : 47
 model name      : AMD Sempron(tm) Processor 3000+
 stepping        : 2
 cpu MHz         : 1000.000
 cache size      : 128 KB
 physical id     : 0
 siblings        : 1
 core id         : 0
 cpu cores       : 1
 apicid          : 0
 initial apicid  : 0
 fpu             : yes
 fpu_exception   : yes
 cpuid level     : 1
 wp              : yes
 flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge

mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm
3dnowext 3dnow rep_good nopl pni lahf_lm
...
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...
 bogomips        : 2000.20
 TLB size        : 1024 4K pages
 clflush size    : 64
 cache_alignment : 64
 address sizes   : 40 bits physical, 48 bits virtual
 power management: ts fid vid ttp tm stc
 $ sudo lspci -nn -k -vv
 00:00.0 Host bridge [0600]: Silicon Integrated Systems [SiS] 761/M761

Host [1039:0761] (rev 01)
...
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...
         Subsystem: Fujitsu Technology Solutions D2030-A1 Motherboard

[1734:1099]
...
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...
...
         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV-

VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
...
...
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...
         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium

TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
...
...
...
         Latency: 64
         Region 0: Memory at f0000000 (32-bit, non-prefetchable)

[size=32M]
...
...
...
...
         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=<none>
...
...
...
...
         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-
...
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...
                 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] PCI-to-PCI

bridge [1039:0004] (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=fast

TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
...
...
...
         Latency: 0, Cache Line Size: 64 bytes
         Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
         I/O behind bridge: 00002000-00002fff
         Memory behind bridge: f2100000-f21fffff
         Prefetchable memory behind bridge: e0000000-efffffff
         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: [d0] Express (v1) Root Port (Slot+), MSI 00
                 DevCap: MaxPayload 128 bytes, PhantFunc 0
                         ExtTag+ RBE-
                 DevCtl: Report errors: Correctable- Non-Fatal- Fatal-

Unsupported-
...
...
...
...
                         RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
                         MaxPayload 128 bytes, MaxReadReq 128 bytes
                 DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq+ AuxPwr+

TransPend-
...
...
...
...
                 LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Exit

Latency L0s <1us, L1 <2us
...
...
...
...
                         ClockPM- Surprise- LLActRep+ BwNot-
                 LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                         ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                 LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+

DLActive+ BWMgmt- ABWMgmt-
...
...
...
...
                 SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug-

Surprise-
...
...
...
...
                         Slot #0, PowerLimit 75.000W; Interlock- NoCompl-
                 SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt-

HPIrq- LinkChg-
...
...
...
...
                         Control: AttnInd Off, PwrInd Off, Power- Interlock-
                 SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+

Interlock-
...
...
...
...
                         Changed: MRL- PresDet- LinkState-
                 RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna-

CRSVisible-
...
...
...
...
                 RootCap: CRSVisible-
                 RootSta: PME ReqID 0000, PMEStatus- PMEPending-
         Capabilities: [bc] HyperTransport: MSI Mapping Enable- Fixed+
         Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit-
                 Address: 00000000  Data: 0000
         Capabilities: [f4] 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: pcieport

 00:02.0 ISA bridge [0601]: Silicon Integrated Systems [SiS] SiS965

[MuTIOL Media IO] [1039:0965] (rev 48)
...
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...
         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

 00:02.5 IDE interface [0101]: Silicon Integrated Systems [SiS] 5513 IDE

Controller [1039:5513] (rev 01) (prog-if 80 [Master])
...
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...
         Subsystem: Fujitsu Technology Solutions D2030-A1 Motherboard

[1734:1095]
...
...
...
...
         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: 128
         Interrupt: pin ? routed to IRQ 16
         Region 0: I/O ports at 01f0 [size=8]
         Region 1: I/O ports at 03f4
         Region 2: I/O ports at 0170 [size=8]
         Region 3: I/O ports at 0374
         Region 4: I/O ports at 1c80 [size=16]
         Capabilities: [58] 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: pata_sis

 00:02.7 Multimedia audio controller [0401]: Silicon Integrated

Systems [SiS] SiS7012 AC'97 Sound Controller [1039:7012] (rev a0)
...
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         Subsystem: Fujitsu Technology Solutions Device [1734:109c]
         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: 173 (13000ns min, 2750ns max)
         Interrupt: pin C routed to IRQ 18
         Region 0: I/O ports at 1400 [size=256]
         Region 1: I/O ports at 1000 [size=128]
         Capabilities: [48] Power Management version 2
                 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=55mA PME(D0-,D1-

,D2-,D3hot+,D3cold+)
...
...
...
...
                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
         Kernel driver in use: snd_intel8x0

 00:03.0 USB controller [0c03]: Silicon Integrated Systems [SiS] USB 1.1

Controller [1039:7001] (rev 0f) (prog-if 10 [OHCI])
...
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         Subsystem: Fujitsu Technology Solutions D2030-A1 Motherboard

[1734:1095]
...
...
...
...
         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)
         Interrupt: pin A routed to IRQ 20
         Region 0: Memory at f2000000 (32-bit, non-prefetchable)

[size=4K]
...
...
...
...
         Kernel driver in use: ohci-pci

 00:03.1 USB controller [0c03]: Silicon Integrated Systems [SiS] USB 1.1

Controller [1039:7001] (rev 0f) (prog-if 10 [OHCI])
...
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...
...
         Subsystem: Fujitsu Technology Solutions D2030-A1 Motherboard

[1734:1095]
...
...
...
...
         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)
         Interrupt: pin B routed to IRQ 21
         Region 0: Memory at f2001000 (32-bit, non-prefetchable)

[size=4K]
...
...
...
...
         Kernel driver in use: ohci-pci

 00:03.2 USB controller [0c03]: Silicon Integrated Systems [SiS] USB 1.1

Controller [1039:7001] (rev 0f) (prog-if 10 [OHCI])
...
...
...
...
         Subsystem: Fujitsu Technology Solutions D2030-A1 Motherboard

[1734:1095]
...
...
...
...
         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)
         Interrupt: pin C routed to IRQ 22
         Region 0: Memory at f2002000 (32-bit, non-prefetchable)

[size=4K]
...
...
...
...
         Kernel driver in use: ohci-pci

 00:03.3 USB controller [0c03]: Silicon Integrated Systems [SiS] USB 2.0

Controller [1039:7002] (prog-if 20 [EHCI])
...
...
...
...
         Subsystem: Fujitsu Technology Solutions D2030-A1 [1734:1095]
         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)
         Interrupt: pin D routed to IRQ 23
         Region 0: Memory at f2003000 (32-bit, non-prefetchable)

[size=4K]
...
...
...
...
         Capabilities: [50] Power Management version 2
                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA

PME(D0+,D1-,D2-,D3hot+,D3cold+)
...
...
...
...
                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
         Kernel driver in use: ehci-pci

 00:05.0 IDE interface [0101]: Silicon Integrated Systems [SiS] 182

SATA/RAID Controller [1039:0182] (rev 01) (prog-if 8f [Master SecP SecO PriP
PriO])
...
...
...
...
         Subsystem: Fujitsu Technology Solutions D2030-A1 [1734:1095]
         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
         Interrupt: pin A routed to IRQ 17
         Region 0: I/O ports at 1cb0 [size=8]
         Region 1: I/O ports at 1ca4 [size=4]
         Region 2: I/O ports at 1ca8 [size=8]
         Region 3: I/O ports at 1ca0 [size=4]
         Region 4: I/O ports at 1c90 [size=16]
         Region 5: I/O ports at 1c00 [size=128]
         Capabilities: [58] 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: sata_sis

 00:06.0 PCI bridge [0604]: Silicon Integrated Systems [SiS] PCI-to-PCI

bridge [1039:000a] (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=fast

TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
...
...
...
         Latency: 0, Cache Line Size: 64 bytes
         Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
         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: [b0] Subsystem: Silicon Integrated Systems [SiS]

Device [1039:0000]
...
...
...
...
         Capabilities: [c0] MSI: Enable+ Count=1/1 Maskable- 64bit-
                 Address: fee0100c  Data: 4181
         Capabilities: [d0] Express (v1) Root Port (Slot+), MSI 00
                 DevCap: MaxPayload 128 bytes, PhantFunc 0
                         ExtTag+ RBE-
                 DevCtl: Report errors: Correctable- Non-Fatal- Fatal-

Unsupported-
...
...
...
...
                         RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
                         MaxPayload 128 bytes, MaxReadReq 128 bytes
                 DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+

TransPend-
...
...
...
...
                 LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Exit

Latency L0s <1us, L1 <2us
...
...
...
...
                         ClockPM- Surprise- LLActRep- BwNot-
                 LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk-
                         ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                 LnkSta: Speed 2.5GT/s, Width x0, TrErr- Train- SlotClk+

DLActive- BWMgmt- ABWMgmt-
...
...
...
...
                 SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug-

Surprise-
...
...
...
...
                         Slot #0, PowerLimit 0.000W; Interlock- NoCompl-
                 SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt-

HPIrq- LinkChg-
...
...
...
...
                         Control: AttnInd Off, PwrInd Off, Power- Interlock-
                 SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+

Interlock-
...
...
...
...
                         Changed: MRL- PresDet- LinkState-
                 RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna-

CRSVisible-
...
...
...
...
                 RootCap: CRSVisible-
                 RootSta: PME ReqID 0000, PMEStatus- PMEPending-
         Capabilities: [f4] 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: [100 v1] Virtual Channel
                 Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
                 Arb:    Fixed- WRR32- WRR64- WRR128-
                 Ctrl:   ArbSelect=Fixed
                 Status: InProgress-
                 VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
                         Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128-

WRR256-
...
...
...
...
                         Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
                         Status: NegoPending- InProgress-
         Capabilities: [130 v1] 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 driver in use: pcieport

 00:09.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.

RTL8169 PCI Gigabit Ethernet Controller [10ec:8169] (rev 10)
...
...
...
...
         Subsystem: Fujitsu Technology Solutions D2030-A1 [1734:1091]
         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 (8000ns min, 16000ns max), Cache Line Size: 32 bytes
         Interrupt: pin A routed to IRQ 19
         Region 0: I/O ports at 1800 [size=256]
         Region 1: Memory at f2004000 (32-bit, non-prefetchable)

[size=256]
...
...
...
...
         Capabilities: [dc] Power Management version 2
                 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0-

,D1+,D2+,D3hot+,D3cold+)
...
...
...
...
                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
         Kernel driver in use: r8169

 00:18.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] K8

[Athlon64/Opteron] HyperTransport Technology Configuration [1022:1100]
...
...
...
...
         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-
...
...
...
         Capabilities: [80] HyperTransport: Host or Secondary Interface
                 Command: WarmRst+ DblEnd- DevNum=0 ChainSide-

HostHide+ Slave- <EOCErr- DUL-
...
...
...
...
                 Link Control: CFlE- CST- CFE- <LkFail- Init+ EOC- TXO-

<CRCErr=0 IsocEn- LSEn- ExtCTL- 64b-
...
...
...
...
                 Link Config: MLWI=16bit DwFcIn- MLWO=16bit DwFcOut-

LWI=16bit DwFcInEn- LWO=16bit DwFcOutEn-
...
...
...
...
                 Revision ID: 1.02
                 Link Frequency: 800MHz
                 Link Error: <Prot- <Ovfl- <EOC- CTLTm-
                 Link Frequency Capability: 200MHz+ 300MHz- 400MHz+

500MHz- 600MHz+ 800MHz+ 1.0GHz- 1.2GHz- 1.4GHz- 1.6GHz- Vend-
...
...
...
...
                 Feature Capability: IsocFC- LDTSTOP+ CRCTM- ECTLT- 64bA-

UIDRD- ExtRS- UCnfE-
...
...
...
...
 00:18.1 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] K8

[Athlon64/Opteron] Address Map [1022:1101]
...
...
...
...
         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-
...
...
...
...
 00:18.2 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] K8

[Athlon64/Opteron] DRAM Controller [1022:1102]
...
...
...
...
         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-
...
...
...
...
         Kernel driver in use: amd64_edac

 00:18.3 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] K8

[Athlon64/Opteron] Miscellaneous Control [1022:1103]
...
...
...
...
         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-
...
...
...
...
         Kernel driver in use: k8temp

 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices,

Inc. [AMD/ATI] RV710/M92 [Mobility Radeon HD 4530/4570/545v]
[1002:9553] (prog-if 00 [VGA controller])
...
...
...
...
         Subsystem: PC Partner Limited / Sapphire Technology Device

[174b:3092]
...
...
...
...
         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: 64 bytes
         Interrupt: pin A routed to IRQ 42
         Region 0: Memory at e0000000 (64-bit, prefetchable)

[size=256M]
...
...
...
...
         Region 2: Memory at f2100000 (64-bit, non-prefetchable)

[size=64K]
...
...
...
...
         Region 4: I/O ports at 2000 [size=256]
         [virtual] Expansion ROM at f2120000 [disabled] [size=128K]
         Capabilities: [50] 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: [58] Express (v2) Legacy Endpoint, MSI 00
                 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s

<4us, L1 unlimited
...
...
...
...
                         ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                 DevCtl: Report errors: Correctable- Non-Fatal- Fatal-

Unsupported-
...
...
...
...
                         RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
                         MaxPayload 128 bytes, MaxReadReq 128 bytes
                 DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr-

TransPend-
...
...
...
...
                 LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Exit

Latency L0s <64ns, L1 <1us
...
...
...
...
                         ClockPM- Surprise- LLActRep- BwNot-
                 LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                         ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                 LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+

DLActive- BWMgmt- ABWMgmt-
...
...
...
...
                 DevCap2: Completion Timeout: Not Supported, TimeoutDis-,

LTR-, OBFF Not Supported
...
...
...
...
                 DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-,

LTR-, OBFF Disabled
...
...
...
...
                 LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance-

SpeedDis-
...
...
...
...
                          Transmit Margin: Normal Operating Range,

EnterModifiedCompliance- ComplianceSOS-
...
...
...
...
                          Compliance De-emphasis: -6dB
                 LnkSta2: Current De-emphasis Level: -6dB,

EqualizationComplete-, EqualizationPhase1-
...
...
...
...
                          EqualizationPhase2-, EqualizationPhase3-,

LinkEqualizationRequest-
...
...
...
...
         Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
                 Address: 00000000fee0100c  Data: 41e1
         Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1

Len=010 <?>
...
...
...
...
         Kernel driver in use: radeon

 01:00.1 Audio device [0403]: Advanced Micro Devices, Inc.

[AMD/ATI] RV710/730 HDMI Audio [Radeon HD 4000 series] [1002:aa38]
...
...
...
...
         Subsystem: PC Partner Limited / Sapphire Technology Device

[174b:aa38]
...
...
...
...
         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: 64 bytes
         Interrupt: pin B routed to IRQ 41
         Region 0: Memory at f2110000 (64-bit, non-prefetchable)

[size=16K]
...
...
...
...
         Capabilities: [50] 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: [58] Express (v2) Legacy Endpoint, MSI 00
                 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s

<4us, L1 unlimited
...
...
...
...
                         ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                 DevCtl: Report errors: Correctable- Non-Fatal- Fatal-

Unsupported-
...
...
...
...
                         RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
                         MaxPayload 128 bytes, MaxReadReq 128 bytes
                 DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr-

TransPend-
...
...
...
...
                 LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Exit

Latency L0s <64ns, L1 <1us
...
...
...
...
                         ClockPM- Surprise- LLActRep- BwNot-
                 LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                         ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                 LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+

DLActive- BWMgmt- ABWMgmt-
...
...
...
...
                 DevCap2: Completion Timeout: Not Supported, TimeoutDis-,

LTR-, OBFF Not Supported
...
...
...
...
                 DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-,

LTR-, OBFF Disabled
...
...
...
...
                 LnkSta2: Current De-emphasis Level: -6dB,

EqualizationComplete-, EqualizationPhase1-
...
...
...
...
                          EqualizationPhase2-, EqualizationPhase3-,

LinkEqualizationRequest-
...
...
...
...
         Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
                 Address: 00000000fee0100c  Data: 41d1
         Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1

Len=010 <?>
...
...
...
...
         Kernel driver in use: snd_hda_intel

Grüße,
  Thomas
Thomas can you provide output of lspci -t
Also did you had a chance to test my ugly patch ?
Cheers,
Jérôme
If my ugly patch works does this quirk also work ?

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RE: radeon: screen garbled after page allocator change, was: Re: [patch v2 3/3] mm: page_alloc: fair zone allocator policy