Cleanup of the d_mmap_t interface.

- Get rid of the useless atop() / pmap_phys_address() detour.  The
  device mmap handlers must now give back the physical address
  without atop()'ing it.
- Don't borrow the physical address of the mapping in the returned
  int.  Now we properly pass a vm_offset_t * and expect it to be
  filled by the mmap handler when the mapping was successful.  The
  mmap handler must now return 0 when successful, any other value
  is considered as an error.  Previously, returning -1 was the only
  way to fail.  This change thus accidentally fixes some devices
  which were bogusly returning errno constants which would have been
  considered as addresses by the device pager.
- Garbage collect the poorly named pmap_phys_address() now that it's
  no longer used.
- Convert all the d_mmap_t consumers to the new API.

I'm still not sure wheter we need a __FreeBSD_version bump for this,
since and we didn't guarantee API/ABI stability until 5.1-RELEASE.

Discussed with:		alc, phk, jake
Reviewed by:		peter
Compile-tested on:	LINT (i386), GENERIC (alpha and sparc64)
Runtime-tested on:	i386

1 files changed, 5 insertions, 3 deletions

diff --git a/sys/geom/geom_stats.c b/sys/geom/geom_stats.c
index caf0780..2577b2a 100644
--- a/sys/geom/geom_stats.c
+++ b/sys/geom/geom_stats.c
@@ -122,15 +122,17 @@ static struct cdevsw geom_stats_cdevsw = {
 };
 
 static int
-g_stat_mmap(dev_t dev, vm_offset_t offset, int nprot)
+g_stat_mmap(dev_t dev, vm_offset_t offset, vm_offset_t *paddr, int nprot)
 {
 	struct statspage *spp;
 
 	if (nprot != VM_PROT_READ)
 		return (-1);
 	TAILQ_FOREACH(spp, &pagelist, list) {
-		if (offset == 0)
-			return (vtophys(spp->stat) >> PAGE_SHIFT);
+		if (offset == 0) {
+			*paddr = vtophys(spp->stat);
+			return (0);
+		}
 		offset -= PAGE_SIZE;
 	}
 	return (-1);