[Intel-gfx] [PATCH 10/10] i915: mst topology dumper in debugfs

Thierry Reding thierry.reding at gmail.com
Tue May 13 03:40:54 PDT 2014

On Tue, May 13, 2014 at 12:18:35PM +0200, Daniel Vetter wrote:
> On Tue, May 13, 2014 at 10:33:27AM +0200, Thierry Reding wrote:
> > On Mon, May 12, 2014 at 04:46:47PM +1000, Dave Airlie wrote:
> > [...]
> > > @@ -3813,6 +3838,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
> > >  	{"i915_pc8_status", i915_pc8_status, 0},
> > >  	{"i915_power_domain_info", i915_power_domain_info, 0},
> > >  	{"i915_display_info", i915_display_info, 0},
> > > +	{"i915_dp_mst_info", i915_dp_mst_info, 0},
> > 
> > This isn't really specific to this patch, but I've been thinking for a
> > while if perhaps it would be a good idea to try to unify debugfs across
> > drivers to some degree. What I mean by that is try to use common names
> > for files with similar functionality. Off the top of my head I think a
> > couple of drivers expose a list of framebuffers via debugfs, mostly
> > using duplicated code and different file names. Sharing the code would
> > of course be easy, but I think there may be some advantage to keeping
> > the names consistent as well.
> Imo our current approach of having seq_file helpers in libraries that
> drivers can use works well. At least with i915 we often want to add some
> more driver-private state to dumps (e.g. for framebuffers), so extracting
> more than what's already extracted is probably hard to do.

Good point.

> But I guess we could add some common files with e.g. just the core
> framebuffer stuff to all drivers. Not terribly motivated myself though
> since i915 has it all already ;-)

I was thinking it would be convenient if there was some consistency
between the debugfs interfaces of the various drivers to make it easier
for people to find equivalent information sources. On second thought
maybe that's not such a useful idea after all since some of the files
may expose similar, but not exactly the same, information, given that
some of it may be driver-specific.

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