[Bug 61529] [ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

[Bug 61529] [ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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https://bugs.freedesktop.org/show_bug.cgi?id=61529

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|xorg-driver-ati@lists.x.org |dri-devel@lists.freedesktop
                   |                            |.org
         QA Contact|xorg-team@lists.x.org       |
            Product|xorg                        |DRI
          Component|Driver/Radeon               |DRM/Radeon

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[Bug 61529] [r600g][kms][ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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Jerome Glisse <glisse@freedesktop.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[ATI RV710]                 |[r600g][kms][ATI RV710]
                   |r600_pcie_gart_tlb_flush+0x |r600_pcie_gart_tlb_flush+0x
                   |f5/0x110                    |f5/0x110

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[Bug 61529] [r600g][kms][ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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Thaddäus Tintenfisch <thad.fisch@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugzilla.kernel.org
                   |                            |/show_bug.cgi?id=49531

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[Bug 61529] [r600g][kms][ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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Thaddäus Tintenfisch <thad.fisch@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://launchpad.net/bugs/
                   |                            |1170917

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[Bug 61529] [r600g][kms][ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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https://bugs.freedesktop.org/show_bug.cgi?id=61529

--- Comment #1 from Thaddäus Tintenfisch <thad.fisch@gmail.com> ---
A commit in 3.17-rc6 is causing this kernel panic to occur when switching off
the dedicated GPU for the first time after booting the system.
This is still reproducible with 4.1-rcX and radeon.runpm=0 (plus radeon.dpm=0).

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[Bug 61529] [r600g][kms][ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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Thaddaeus Tintenfisch <thad.fisch@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major

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[Bug 61529] [r600g][kms][ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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--- Comment #2 from Michel Dänzer <michel@daenzer.net> ---
Created attachment 116867
  --> https://bugs.freedesktop.org/attachment.cgi?id=116867&action=edit
drm/radeon: Don't flush the GART TLB if rdev->gart.ptr == NULL

Does this patch fix the problem?

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[Bug 61529] [r600g][kms][ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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--- Comment #3 from Thaddaeus Tintenfisch <thad.fisch@gmail.com> ---
I will test your patch as soon as possible. Meanwhile, I just finished
bisecting the kernel with the result:

b440bde74f043c8ec31081cb59c9a53ade954701 is the first bad commit

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[Bug 61529] [r600g][kms][ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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--- Comment #4 from Thaddaeus Tintenfisch <thad.fisch@gmail.com> ---
Created attachment 116881
  --> https://bugs.freedesktop.org/attachment.cgi?id=116881&action=edit
dmesg snippet

I have applied radeon-gart_tlb_flush-NULL.diff to git master and it does fix
the hard lockup.
However, powering off the dedicated GPU still triggers some kernel panics (see
attached log file).

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[Bug 61529] [r600g][kms][ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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--- Comment #5 from Alex Deucher <alexdeucher@gmail.com> ---
You are probably seeing this bug (bug is in the pci hotplug system):
https://bugzilla.kernel.org/show_bug.cgi?id=61891
See if the latest patch there helps.

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[Bug 61529] [r600g][kms][ATI RV710] r600_pcie_gart_tlb_flush+0xf5/0x110

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--- Comment #6 from Thaddaeus Tintenfisch <thad.fisch@gmail.com> ---
Alex, do you mean the patch from comment #83?
The previous one from comment #78 was already applied ->
0824965140fff1bf640a987dc790d1594a8e0699.

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--- Comment #7 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Thaddaeus Tintenfisch from comment #6)
> Alex, do you mean the patch from comment #83?
> The previous one from comment #78 was already applied ->
> 0824965140fff1bf640a987dc790d1594a8e0699.

I didn't realize it had already been applied.

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--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
The warnings (not panics) would need to be tracked in separate reports, but at
least the first one is harmless.

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--- Comment #9 from Thaddaeus Tintenfisch <thad.fisch@gmail.com> ---
The first two warnings are pretty much identical (3 warnings in total).
Should I create two new reports which reference the patch from this report?

The main issue here is that the vgaswitcheroo interface is no longer available
after powering off the dGPU (/sys/kernel/debug/vgaswitcheroo/switch is gone).

>From the log:

[   60.462677] vga_switcheroo: disabled

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--- Comment #10 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Thaddaeus Tintenfisch from comment #9)
> The first two warnings are pretty much identical (3 warnings in total).
> Should I create two new reports which reference the patch from this report?
> 
> The main issue here is that the vgaswitcheroo interface is no longer
> available after powering off the dGPU
> (/sys/kernel/debug/vgaswitcheroo/switch is gone).
> 
> From the log:
> 
> [   60.462677] vga_switcheroo: disabled

It's still an acpi hotplug bug:
[   60.454402]  [<ffffffffc022c295>] radeon_pci_remove+0x15/0x20 [radeon]
[   60.454407]  [<ffffffff813e470f>] pci_device_remove+0x3f/0xc0
[   60.454414]  [<ffffffff814e6a86>] __device_release_driver+0x96/0x130
[   60.454418]  [<ffffffff814e6b43>] device_release_driver+0x23/0x30
[   60.454423]  [<ffffffff813df012>] pci_stop_bus_device+0x92/0xa0
[   60.454427]  [<ffffffff813df136>] pci_stop_and_remove_bus_device+0x16/0x30
[   60.454432]  [<ffffffff813fbf23>] disable_slot+0x53/0xa0
[   60.454436]  [<ffffffff813fc642>] acpiphp_check_bridge.part.8+0xd2/0xf0
[   60.454440]  [<ffffffff813fcec2>] acpiphp_hotplug_notify+0xd2/0x220
[   60.454445]  [<ffffffff813fcdf0>] ? acpiphp_post_dock_fixup+0xc0/0xc0
[   60.454450]  [<ffffffff81429fb7>] acpi_device_hotplug+0x3b0/0x3f8
[   60.454454]  [<ffffffff814233ae>] acpi_hotplug_work_fn+0x1f/0x2b

The acpiphp driver is trying to remove the driver after switcheroo has turned
it off.  It should not not kicking in and removing the driver.  It looks like
there is some other broken case in the acpiphp code.  I'd suggest filing a new
acpiphp bug on bugzilla.kernel.org and referencing this bug:
https://bugzilla.kernel.org/show_bug.cgi?id=61891
or adding a comment to that bug that there are still cases that are broken.

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--- Comment #11 from Thaddaeus Tintenfisch <thad.fisch@gmail.com> ---
I have added a comment to the linked report. Also, the patch from comment #2
for this bug can be forwarded then.

Thanks.

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--- Comment #12 from Thaddaeus Tintenfisch <thad.fisch@gmail.com> ---
Is anything missing? Does the patch need more testing?

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Thaddaeus Tintenfisch <thad.fisch@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #13 from Thaddaeus Tintenfisch <thad.fisch@gmail.com> ---
Oh, 4.2-rc3 includes the patch. Thanks.

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=233709d2cd6bbaaeda0aeb8d11f6ca7f98563b39

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