Re: [error] Drm -> amdgpu Unrecoverable Machine Check

[Christian König <ckoenig.leichtzumerken@xxxxxxxxx>]

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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