Re: revert dma direct internals abuse

Thomas Hellstrom
2019-04-23T12:26:12Z

Hi, Christoph,

On Mon, 2019-04-22 at 19:56 +0200, hch@lst.de wrote:
> On Wed, Apr 10, 2019 at 03:01:14PM +0000, Thomas Hellstrom wrote:
> > > So can you please respin a version acceptable to you and submit
> > > it
> > > for 5.1 ASAP? Otherwise I'll need to move ahead with the simple
> > > revert.
> >
> > I will.
> > I need to do some testing to investigate how to best choose between
> > the
> > options, but will have something ready for 5.1.
>
> I still don't see anything in -rc6..

Been on easter vacation. I have a patch ready for review, though, will
send it out in a moment.

It turns out that to do something well-behaved in case someone sets
swiotlb=force, the variable swiotlb_force would need to be exported.
(I can't rely on swiotlb_nr_tbl()).

That's not currently done in the patch, but instead the driver just
malfunctions like most other graphics drivers.

/Thomas