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Date:	Tue, 16 Sep 2014 09:49:25 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Alex Deucher <alexdeucher@...il.com>,
	DRI <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: 3.14 radeon regression: radeon is broken (pci bug?)

On Tue, Sep 16, 2014 at 9:45 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Thu, Mar 27, 2014 at 11:30:37AM -0600, Bjorn Helgaas wrote:
>> On Mon, Mar 24, 2014 at 4:04 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> > On Sat, Mar 22, 2014 at 9:18 AM, Andy Lutomirski <luto@...capital.net> wrote:
>> >> On Fri, Mar 21, 2014 at 9:37 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> >>> On Fri, Mar 21, 2014 at 9:49 AM, Andy Lutomirski <luto@...capital.net> wrote:
>> >>>> On Fri, Mar 21, 2014 at 7:41 AM, Alex Deucher <alexdeucher@...il.com> wrote:
>> >>>>> On Thu, Mar 20, 2014 at 10:17 PM, Andy Lutomirski <luto@...capital.net> 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.
>> >
>> > CONFIG_GART_IOMMU is not defined for the 3.13.6-200.rc20.x86_64
>> > kernel, but apparently it is for your v3.14-rc7 kernel.  That explains
>> > the "No AGP bridge found" difference.
>> >
>> > I'm afraid I still can't shed any light on the problem with the radeon device.
>>
>> Is there any news on this?  It would be a shame to release v3.14 with
>> a known regression.
>>
>> I opened https://bugzilla.kernel.org/show_bug.cgi?id=73041 as a place
>> to archive the dmesg, etc.
>
> I didn't see any resolution on this (and I haven't done anything with it
> myself).  If this is still a problem, could it be the same as
> https://bugzilla.kernel.org/show_bug.cgi?id=79701 ?  There's a fix for
> 79701 in linux-next as of 2014-09-16:
>
> https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/commit/?h=pci/hotplug-vga&id=b440bde74f043c8ec31081cb59c9a53ade954701
>

This hasn't been a problem for me lately.  IIRC there was a specific
config that triggered this, and I thought that I stuck it on a
bugzilla entry somewhere.

--Andy
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