On Tue, Jun 25, 2019 at 09:37:22AM -0700, Mark Greer wrote: > Yeah, the mpsc driver had lots of ugly cache related hacks because of > cache coherency bugs in the early version of the MV64x60 bridge chips > that it was embedded in. That chip is pretty much dead now and I've > removed core support for it from the powerpc tree. Removing the mpsc > driver is on my todo list but I've been busy and lazy. So, to sum it > up, don't spend any more time worrying about it as it should be removed. > > I'll post a patch to do that tonight and I'm sorry for any time you've > spent looking at it so far. No problem. And if future such broken chips show up we now have support for per-device DMA coherency settings and could actually handle it in a reaѕonably clean way.
