Bug 100304

Summary:

[bisected] Kernel oops on startup

Product:

DRI

Reporter:

Mike Lothian <mike>

Component:

DRM/AMDgpu

Assignee:

Default DRI bug account <dri-devel>

Status:

RESOLVED FIXED

QA Contact:

Severity:

normal

Priority:

medium

CC:

mike

Version:

DRI git

Hardware:

Other

OS:

All

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
Screen shot	none
possible fix	none

Description Mike Lothian 2017-03-21 17:11:22 UTC

Created attachment 130353 [details]
Screen shot

Bisected back to:

2d38d25554b739b50eec254205f769580751fb02 is the first bad commit
commit 2d38d25554b739b50eec254205f769580751fb02
Author: David Panariti <David.Panariti@amd.com>
Date:   Mon Mar 13 13:33:18 2017 -0400

    drm/amdgpu: Switch baremetal to use KIQ for compute ring management.
    
    KIQ is the Kernel Interface Queue for managing the MEC.  Rather than setting
    up rings via direct MMIO of ring registers, the rings are configured via
    special packets sent to the KIQ.  The allows the MEC to better manage shared
    resources and certain power events.
    
    Signed-off-by: David Panariti <David.Panariti@amd.com>
    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Acked-by: Tom St Denis <tom.stdenis@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com

Comment 1 Alex Deucher 2017-03-21 17:14:29 UTC

What chip is this?

Comment 2 Alex Deucher 2017-03-21 17:16:59 UTC

does disabling runpm work around it?

Comment 3 Mike Lothian 2017-03-21 17:21:45 UTC

This is on Tonga in a prime setup

Comment 4 Mike Lothian 2017-03-21 17:39:14 UTC

Yes setting amdgpu.runpm=0 fixes the issue - also reverting the commit allows me to boot

Comment 5 Alex Deucher 2017-03-23 15:03:21 UTC

Created attachment 130399 [details] [review]
possible fix

This should fix the issue.

Comment 6 Mike Lothian 2017-03-23 15:30:54 UTC

Thanks, that's working great for me

Comment 7 Alex Deucher 2017-03-23 18:54:18 UTC

fix squashed into the original patch.

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