# Re: \[v3,12/16\] cxl: Add base builtin support

- From: Michael Neuling \<hidden\>
- Date: 2014-10-08 00:45:32 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2014/10/4349015
- Thread: https://ratatoskr.run/lkml/2014/10/4348404/t.md

```text
On Wed, 2014-10-08 at 10:04 +1100, Michael Ellerman wrote:
> On Tue, 2014-07-10 at 10:48:18 UTC, Michael Neuling wrote:
> > From: Ian Munsie <redacted>
> >=20
> > This adds the base cxl support that needs to be build into the kernel t=
o use
> > cxl as a module. This is needed so that the cxl call backs from the cor=
e
> > powerpc mm code always exist irrespective of if the cxl module is loade=
d or
> > not. This is similar to how cell works with CONFIG_SPU_BASE.
> >=20
> > This adds a cxl_slbia() call (similar to spu_flush_all_slbs()) which ch=
ecks for
> > the cxl module being loaded. If the modules is not loaded we return, ot=
herwise
> > we call into the cxl SLB invalidation code.
> >=20
> > This also adds the cxl_ctx_in_use() function for use in the mm code to =
see if
> > any cxl contexts are currently in use. This is used by the tlbie() to
> > determine if it can do local TLB invalidations or not. This also adds g=
et/put
> > calls for the cxl driver module to refcount the active cxl contexts.
>=20
> This last paragraph is no longer true.

Yep, thanks.  I'll move it to patch 7 where it does apply.

Mikey
```