[error] Drm -> amdgpu Unrecoverable Machine Check

[Christian König]

Hi Yusuf,

Am 02.12.19 um 12:41 schrieb Yusuf Altıparmak:
> My embedded board is freezing when I put E9171 on PCIe. What is the 
> meaning of Unrecoverable Machine Check error about GPU?

Well see the explanation on Wikipedia for example: 
https://en.wikipedia.org/wiki/Machine-check_exception

In general it means you have messed up something in your hardware 
configuration.

> Could PCIe settings in .dts file cause this problem?

Possible, but rather unlikely. My best guess is that it is some problem 
with the power supply.

> If it is, is there any sample PCIe configuration for E9171?

The E9171 is just a PCIe device, so the dtsi is actually rather 
uninteresting. What we really need is a full dmesg and maybe lspci 
output would help as well.

Regards,
Christian.

> I attached my dts file.
>
> System is working fine when GPU is not plugged in.
> *
> *
> *This is the last console log before freeze:*
> [drm] amdgpu kernel modesetting enabled.
> [drm] initializing kernel modesetting (POLARIS12 0x1002:0x6987 
> 0x1787:0x2389 0x80).
> [drm] register mmio base: 0x20200000
> fsl-fman-port ffe488000.port fm1-gb0: renamed from eth0
> [drm] register mmio size: 262144
> [drm] add ip block number 0 <vi_common>
> [drm] add ip block number 1 <gmc_v8_0>
> [drm] add ip block number 2 <tonga_ih>
> [drm] add ip block number 3 <powerplay>
> [drm] add ip block number 4 <dm>
> [drm] add ip block number 5 <gfx_v8_0>
> [drm] add ip block number 6 <sdma_v3_0>
> [drm] add ip block number 7 <uvd_v6_0>
> [drm] add ip block number 8 <vce_v3_0>
> [drm] UVD is enabled in VM mode
> [drm] UVD ENC is enabled in VM mode
> [drm] VCE enabled in VM mode
> ATOM BIOS: 113-ER16BFC-001
> [drm] GPU posting now...
> Disabling lock debugging due to kernel taint
> Machine check in kernel mode.
> Caused by (from MCSR=a000): Load Error Report
> Guarded Load Error Report
> Kernel panic - not syncing: Unrecoverable Machine check
> CPU: 1 PID: 2023 Comm: udevd Tainted: G   M  4.19.26+gc0c2141 #1
> Call Trace:
>
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