[Patch v1 4/5] drm/amdkfd: show warning when kfd is locked

[Bhardwaj, Rajneesh]

On 1/28/2020 5:42 PM, Felix Kuehling wrote:
> On 2020-01-27 20:29, Rajneesh Bhardwaj wrote:
>> During system suspend the kfd driver aquires a lock that prohibits
>> further kfd actions unless the gpu is resumed. This adds some info which
>> can be useful while debugging.
>>
>> Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj at amd.com>
>> ---
>>   drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c 
>> b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
>> index 1aebda4bbbe7..081cc5f40d18 100644
>> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
>> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
>> @@ -127,6 +127,8 @@ static int kfd_open(struct inode *inode, struct 
>> file *filep)
>>           return PTR_ERR(process);
>>         if (kfd_is_locked()) {
>> +        dev_warn(kfd_device, "kfd is locked!\n"
>> +                "process %d unreferenced", process->pasid);
>
> If this is for debugging, make it dev_dbg. Printing warnings like this 
> usually confuses people reporting completely unrelated problems that 
> aren't even kernel problems at all. "Look, I found a warning in the 
> kernel log. It must be a kernel problem."

Agree. Will fix in v2.


>
> Regards,
>   Felix
>
>
>>           kfd_unref_process(process);
>>           return -EAGAIN;
>>       }