Am 17.01.22 um 12:43 schrieb Sharma, Shashank:
Hello Christian,
On 1/17/2022 11:37 AM, Christian König wrote:
Am 17.01.22 um 11:34 schrieb Somalapuram, Amaranath:
[SNIP]
Any suggestion how we can notify user space during this situation.
Well trace points should work. They use a ring buffer and are
specially made to work in such situations.
We are anyways sending a trace event with data, but can trace event be
a wake up source for an application (like a tracer) ? This DRM event
is just to indicate that reset happened, so app has to read from trace
file.
Yeah, that's a really good question I can't fully answer. As far as I
know you can filter in userspace what you get from the tracer, but I
don't know if you can block on a specific event.
Christian.
Alternative would be to audit the udev code and allow giving a GFP
mask to the function to make sure that we don't run into the deadlock.
Another alternative is a debugfs file which just blocks for the next
reset to happen.
- Shashank
Regards,
Christian.
Regards,
S.Amarnath
