Machine Check Exceptions

[Rodriguez Quesada, Pablo]

Hi Christophe,

I will try with the NMI approach. Just one question: 

>The driver I wrote that you are referring to is to handle the watchdog in e300 powerpc core. This is because the e300 gererates a machine check on expiry >when the watchdog is configured in NMI mode.

By NMI mode do you mean enabling the CONFIG_HAVE_NMI_WATCHDOG symbol on the .config?


Thank you,
Pablo

-----Original Message-----
From: Christophe Leroy <christophe.leroy at c-s.fr> 
Sent: Monday, April 29, 2019 12:10 AM
To: Rodriguez Quesada, Pablo <Pablo.Rodriguez-Quesada at windriver.com>
Cc: linuxppc-dev at lists.ozlabs.org
Subject: Re: Machine Check Exceptions

Hi Pablo,

I know nothing about mce-inject.

The driver I wrote that you are referring to is to handle the watchdog in e300 powerpc core. This is because the e300 gererates a machine check on expiry when the watchdog is configured in NMI mode.

Therefore, triggering the machine check is rather easy in that case, I just have to stop refreshing the watchdog.

Christophe

Le 25/04/2019 à 17:35, Rodriguez Quesada, Pablo a écrit :
> Hi Christopher,
> 
> I am trying to create a custom handler for MCE, but I don't have a way 
> to trigger it (Or don't know how)
> 
> Therefore I looked at the mce-inject tool(**) and compile it for PPC but the path "/sys/devices/system/machine check/machinecheck0" doesn't exist unlike Intel architecture and the app fails. I want to fix it.
> 
> My question is: Do you know if there is a way to inject an MCE on PowerPC? Or can you guide me on how to start my research about it. I find it very difficult to search for PPC documentation. That is why I am writing to you, to get any tips for developing a mce-inject for PPC. And of course, I would be more than glad to contribute to the OpenSource community.
> 
> Also, how did you test your handler? Do you have an easy mechanism to trigger the exceptions?
> 
> Thank you,
> Pablo
> 
> (**) https://github.com/andikleen/mce-inject/
> 
> 
> 
> -----Original Message-----
> From: Christophe Leroy <christophe.leroy at c-s.fr>
> Sent: Wednesday, April 24, 2019 11:07 PM
> To: Rodriguez Quesada, Pablo <Pablo.Rodriguez-Quesada at windriver.com>
> Subject: Re: Machine Check Exceptions
> 
> Hi Pablo,
> 
> No problem
> 
> Christophe
> 
> 
> Le 24/04/2019 à 21:33, Rodriguez Quesada, Pablo a écrit :
>> Hi Cristopher,
>>
>> Hope you are doing good!
>>
>> I am learning about Machine Check Exceptions on PPC, and I found this 
>> commit of yours:
>>
>> https://github.com/torvalds/linux/commit/0deae39cec6dab3a66794f3e9e83
>> c
>> a4dc30080f1
>>
>> Would you mind if I ask you a couple of questions?
>>
>> Thank you,
>>
>> WR logo signiture <http://www.windriver.com/>
>>
>> 	
>>
>> *Pablo Rodriguez*, Intern, Wind River Costa Rica
>>