Le 04/06/2012 16:31, Jerome Glisse a ?crit : > > I don't think sysfs is the way to go, i am pretty sure that power > management will change drasticly again in the future especialy btw > discret and integrated GPU. I would rather have hardware specific > ioctl. > > Cheers, > Jerome Any particular idea of what may change?
The proposed interface would work even on entirely dynamic reclocking (per-domain frequency scaling) as opposed to perflvl-based reclocking. It is unlikely to happen though. A more realistic possibility could be that engines would be reclocked independently according to their internal load. If that was to happen, then the already-existing API could be used as a master control and engines could specify the performance level policy they want (follow master, always min, always max, conservative, dynamic). I'm pretty sure voltage domains will soon appear but I don't see what could possibly be changed that wouldn't be covered by what I proposed. As for the reason we would like to use IOCTLs instead of sysfs, I really don't understand what is the rationale. I personally want to empower the users to let them decide what is best for them. Sysfs is way easier to work with! Although my idea may be sketchy, I am dead-serious about coming up with a good API. Martin
