Re: 3.14 radeon regression: radeon is broken (pci bug?)

[Andy Lutomirski]

On Fri, Mar 21, 2014 at 9:37 AM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote:
> On Fri, Mar 21, 2014 at 9:49 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
>> On Fri, Mar 21, 2014 at 7:41 AM, Alex Deucher <alexdeucher@xxxxxxxxx> wrote:
>>> On Thu, Mar 20, 2014 at 10:17 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
>>>> My system works on a 3.13 Fedora kernel.  It does not work on a
>>>> more-or-less identically configured 3.14-rc7+ kernel.  The symptom is
>>>> that the Plymouth password prompt flashes and them the screen goes
>>>> blank.  Hitting escape brings back the text console, and all is well
>>>> until X tries to start.  Then I get a blank screen.  killall -9 Xorg
>>>> from ssh causes these errors to be logged:
>>>>
>>>>
>>>> [  226.239747] [drm:atom_op_jump] *ERROR* atombios stuck in loop for
>>>> more than 5secs aborting
>>>> [  226.239751] [drm:atom_execute_table_locked] *ERROR* atombios stuck
>>>> executing CD34 (len 55, WS 0, PS 0) @ 0xCD57
>>>> [  231.241492] [drm:atom_op_jump] *ERROR* atombios stuck in loop for
>>>> more than 5secs aborting
>>>> [  231.241496] [drm:atom_execute_table_locked] *ERROR* atombios stuck
>>>> executing CD6C (len 62, WS 0, PS 0) @ 0xCD88
>>>> [  236.243111] [drm:atom_op_jump] *ERROR* atombios stuck in loop for
>>>> more than 5secs aborting
>>>> [  236.243115] [drm:atom_execute_table_locked] *ERROR* atombios stuck
>>>> executing CD6C (len 62, WS 0, PS 0) @ 0xCD88
>>>> [  241.244625] [drm:atom_op_jump] *ERROR* atombios stuck in loop for
>>>> more than 5secs aborting
>>>> [  241.244628] [drm:atom_execute_table_locked] *ERROR* atombios stuck
>>>> executing CD6C (len 62, WS 0, PS 0) @ 0xCD88
>>>>
>>>>
>>>> lspci -vvvxxxnn on 3.14-rc7+ says:
>>>>
>>>> 09:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
>>>> [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] [1002:6779]
>>>> (rev ff) (prog-if ff)
>>>>     !!! Unknown header type 7f
>>>>     Kernel driver in use: radeon
>>>> 00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>> 10: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>> 20: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>> 30: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>>
>>>> 09:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI]
>>>> Caicos HDMI Audio [Radeon HD 6400 Series] [1002:aa98] (rev ff)
>>>> (prog-if ff)
>>>>     !!! Unknown header type 7f
>>>>     Kernel driver in use: snd_hda_intel
>>>> 00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>> 10: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>> 20: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>> 30: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>>>>
>>>> (oops!)
>>>>
>>>> On 3.13, it says:
>>>>
>>>> 09:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
>>>> [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] [1002:6779]
>>>> (prog-if 00 [VGA controller])
>>>>         Subsystem: PC Partner Limited / Sapphire Technology Radeon HD
>>>> 6450 1 GB DDR3 [174b:e164]
>>>>         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 92
>>>>         Region 0: Memory at e0000000 (64-bit, prefetchable) [size=256M]
>>>>         Region 2: Memory at f4a20000 (64-bit, non-prefetchable) [size=128K]
>>>>         Region 4: I/O ports at c000 [size=256]
>>>>         Expansion ROM at f4a00000 [disabled] [size=128K]
>>>>         Capabilities: <access denied>
>>>>         Kernel driver in use: radeon
>>>> 00: 02 10 79 67 07 04 10 00 00 00 00 03 10 00 80 00
>>>> 10: 0c 00 00 e0 00 00 00 00 04 00 a2 f4 00 00 00 00
>>>> 20: 01 c0 00 00 00 00 00 00 00 00 00 00 4b 17 64 e1
>>>> 30: 00 00 a0 f4 50 00 00 00 00 00 00 00 0a 01 00 00
>>>>
>>>> 09:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI]
>>>> Caicos HDMI Audio [Radeon HD 6400 Series] [1002:aa98]
>>>>         Subsystem: PC Partner Limited / Sapphire Technology Radeon HD
>>>> 6450 1GB DDR3 [174b:aa98]
>>>>         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 96
>>>>         Region 0: Memory at f4a40000 (64-bit, non-prefetchable) [size=16K]
>>>>         Capabilities: <access denied>
>>>>         Kernel driver in use: snd_hda_intel
>>>> 00: 02 10 98 aa 06 04 10 00 00 00 03 04 10 00 80 00
>>>> 10: 04 00 a4 f4 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 4b 17 98 aa
>>>> 30: 00 00 00 00 50 00 00 00 00 00 00 00 05 02 00 00
>>>>
>>>> Logs attached.
>
> Hi Andy,
>
> I'm really sorry that you tripped over this, but thanks a lot for the
> report.  Is there any chance the box is currently running v3.13, and
> you could collect the dmesg log from it?  I don't see anything unusual
> from a PCI perspective in the v3.14-rc7 dmesg; all the PCI device
> resources look fine, and we didn't reassign anything.  It seems like
> the 0000:09:00.x devices just stopped responding for some reason, and
> the PCI core shouldn't really be involved after the radeon driver
> claims and enables those devices.  But it's possible I'd get a clue by
> comparing the v3.13 and v3.14-rc7 dmesg logs.

Attached.  I also clearly screwed something up about my 3.14 config --
I meant for it to match the Fedora config, but it doesn't.  At least
NR_CPUs is too low.  That shoudn't break radeon, but maybe something
odd happens.

3.14 also complains that it can't find an AGP bridge.  3.13 does not
complain about that.

--Andy

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