[Bug 194867] New: DRM BUG while initializing cape verde (2nd card)

[Bug 194867] New: DRM BUG while initializing cape verde (2nd card)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=194867

            Bug ID: 194867
           Summary: DRM BUG while initializing cape verde (2nd card)
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.11-rc2
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: janpieter.sollie@dommel.be
        Regression: No

Created attachment 255215
  --> https://bugzilla.kernel.org/attachment.cgi?id=255215&action=edit
zip file with all listed attachments

There seems to be a logical error while specifying the memory sizes for ttm in
the amdgpu module on the SI architecture:
while the Fiji card boots fine, the Cape Verde card gives a kernel BUG.
dmesg and .config and proposed patch in attachment.
the problem lies in linux/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c: the
determination of the p_size is reduced 0 when the page_shift is too big
I managed to work around the problem when changing the sentence
"adev->gds.mem.total_size >> PAGE_SHIFT)" in  amdgpu_ttm_init to
"(adev->gds.mem.total_size >> PAGE_SHIFT) + 1)", and the same for
"(adev->gds.gws.total_size" and "adev->gds.oa.total_size", though I am not sure
this is the correct solution.  The problem is that my SI card is limited in
memory (I guess) and the page_size is 12

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[Bug 194867] DRM BUG while initializing cape verde (2nd card)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=194867

Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #1 from Alex Deucher (alexdeucher@gmail.com) ---
Created attachment 255263
  --> https://bugzilla.kernel.org/attachment.cgi?id=255263&action=edit
patch 1/2

Does this patch set fix the issue?

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[Bug 194867] DRM BUG while initializing cape verde (2nd card)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=194867

--- Comment #2 from Alex Deucher (alexdeucher@gmail.com) ---
Created attachment 255265
  --> https://bugzilla.kernel.org/attachment.cgi?id=255265&action=edit
patch 2/2

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[Bug 194867] DRM BUG while initializing cape verde (2nd card)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=194867

--- Comment #3 from Janpieter Sollie (janpieter.sollie@dommel.be) ---
we're one step further: see triplefault.txt output.
I set the kernel verbosity to 7, and did a modprobe amdgpu (the module is
blacklisted).  The error is gone, but the machine hits a triple fault (I
suspect it does, don't blame me when it doesn't) and because of that, it
immediately reboots without panic.  should I file a new bug for that, or can
you have a look at it?
notice that this does not happen with dpm disabled.

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[Bug 194867] DRM BUG while initializing cape verde (2nd card)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=194867

--- Comment #4 from Janpieter Sollie (janpieter.sollie@dommel.be) ---
Created attachment 255283
  --> https://bugzilla.kernel.org/attachment.cgi?id=255283&action=edit
/proc/kmsg output

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[Bug 194867] DRM BUG while initializing cape verde (2nd card)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=194867

--- Comment #5 from Michel Dänzer (michel@daenzer.net) ---
Did this work with kernel 4.10 or older?

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[Bug 194867] DRM BUG while initializing cape verde (2nd card)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=194867

--- Comment #6 from Janpieter Sollie (janpieter.sollie@dommel.be) ---
no, the output is exactly the same: after the 4 ring tests, it reboots

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[Bug 194867] DRM BUG while initializing cape verde (2nd card)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=194867

--- Comment #7 from Michel Dänzer (michel@daenzer.net) ---
That should be tracked in a separate report then.

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[Bug 194867] DRM BUG while initializing cape verde (2nd card)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=194867

Janpieter Sollie (janpieter.sollie@dommel.be) changed:

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

--- Comment #8 from Janpieter Sollie (janpieter.sollie@dommel.be) ---
is there any documentation except my kernel config, lsmod, /proc/kmsg and lspci
you need to handle this as a new report? 'cause I can annoy myself with users
coming to me saying 'it doesn't work and i know nothing about it', so I'd like
to provide every possible info you people need

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