[PATCH v3 2/2] powerpc/pseries: Add driver for PAPR SCM regions

[Oliver]

On Mon, Oct 15, 2018 at 10:44 AM Dan Williams <dan.j.williams at intel.com> wrote:
>
> On Sun, Oct 14, 2018 at 4:19 PM Oliver O'Halloran <oohall at gmail.com> wrote:
> >
> > Adds a driver that implements support for enabling and accessing PAPR
> > SCM regions. Unfortunately due to how the PAPR interface works we can't
> > use the existing of_pmem driver (yet) because:
> >
> >  a) The guest is required to use the H_SCM_BIND_MEM h-call to add
> >     add the SCM region to it's physical address space, and
> >  b) There is currently no mechanism for relating a bare of_pmem region
> >     to the backing DIMM (or not-a-DIMM for our case).
> >
> > Both of these are easily handled by rolling the functionality into a
> > seperate driver so here we are...
> >
> > Acked-by: Dan Williams <dan.j.williams at intel.com>
> > Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
> > ---
> > The alternative implementation here is that we have the pseries code
> > do the h-calls and craft a pmem-region@<addr> node based on that.
> > However, that doesn't solve b) and mpe has expressed his dislike of
> > adding new stuff to the DT at runtime so i'd say that's a non-starter.
> > ---
> > v2: no change
> > v3: Corrected the mapping to use a DPA start address of zero
> >     Added cond_resched() calls in the bind/unbind loops
>
> Looks good, could I trouble you for an ack on the build / merge fix?
>
> https://patchwork.kernel.org/patch/10640385/

Sure thing. I checked that it built when rebased on top of your
pending branch before posting.