[Intel-gfx] [PATCH] [RFC] drm/i915: Generate a hang error code

[Jesse Barnes]

On Tue,  4 Feb 2014 12:18:55 +0000
Ben Widawsky <benjamin.widawsky at intel.com> wrote:

> We get a large number of bugs which have a, "hey I have that too"
> because they see a GPU hang in dmesg. While two machines of the same
> model having a GPU hang is indeed a coincidence, it is far from enough
> evidence to suggest they are the same.
> 
> In order to reduce this effect, and hopefully get people to file new bug
> reports, clearly the error message itself has been insufficient (see ref
> at the bottom for a new bug report with this characteristic).
> 
> The algorithm is purposely pretty naive. I don't think we need much in
> order to avoid the problem I am trying to solve, and keeping it naive
> gives us some ability to make a decent test case.

I like the direction of this.  If we can get some basic info into the
dmesg part of things (the only part regular users will actually look
at) we can probably avoid some of the "me too" action we see on general
GPU hangs.  Having PID, comm, and some sort of hang signature are all
good steps in that direction imo.

Acked-by: Jesse Barnes <jbarnes at virtuousgeek.org>

Jesse