Re: svn commit: r270201 - in head/sys: powerpc/include sys

Konstantin Belousov <[email protected]> Fri, 22 Aug 2014 22:01:40 +0300

Newsgroups	gmane.os.freebsd.devel.sparc
Message-ID	<[email protected]>

On Fri, Aug 22, 2014 at 07:46:32PM +0100, Craig Butler wrote:
> On Wed, 2014-08-20 at 11:27 +0300, Konstantin Belousov wrote:
> > On Wed, Aug 20, 2014 at 08:02:38AM +0000, Konstantin Belousov wrote:
> > > Author: kib
> > > Date: Wed Aug 20 08:02:38 2014
> > > New Revision: 270201
> > > URL: http://svnweb.freebsd.org/changeset/base/270201
> > > 
> > > Log:
> > >   Add arch-specific macro SFBUF_PHYS_DMAP(), which should translate the
> > >   physical address of the page to direct map address, in case
> > >   SFBUF_OPTIONAL_DIRECT_MAP returns true.  The case of PowerPC AIM
> > >   64bit, where the page physical address is identical to the direct map
> > >   address, is accidental.
> > Real use of this interposer is for sparc64 machines which can use direct
> > map due to usable cache implementation.
> > 
> > Could someone with the machine identified as SPARC64V test the following
> > patch ?  Just booting multiuser should be enough.
> > 
> > diff --git a/sys/sparc64/include/vmparam.h b/sys/sparc64/include/vmparam.h
> > index 8e7d76c..c2f30c3 100644
> > --- a/sys/sparc64/include/vmparam.h
> > +++ b/sys/sparc64/include/vmparam.h
> > @@ -241,5 +241,8 @@ extern vm_offset_t vm_max_kernel_address;
> >  
> >  #define	SFBUF
> >  #define	SFBUF_MAP
> > +#define	SFBUF_OPTIONAL_DIRECT_MAP	dcache_color_ignore
> > +#include <machine/tlb.h>
> > +#define	SFBUF_PHYS_DMAP(x)		TLB_PHYS_TO_DIRECT(x)
> >  
> >  #endif /* !_MACHINE_VMPARAM_H_ */
> 
> What machines are identified as SPARC64V ?? our collection only
> identifies as sparc64.
SPARC64V are Zeus cores from Fujitsu.
https://en.wikipedia.org/wiki/SPARC64_V

FWIW, I find it strange that later cores are not marked as having
the unaliasing tagging.

> 
> I think the sun4v code got sin binned, AFAIK the sun4u identifies as
> just plain sparc64.
sun4v is the platform name, not the CPU microarchitecture.  I believe
that Zeus are sun4u.

signature.asc (application/pgp-signature, 819 B)