Merge all MD sf_buf allocators into one MI, residing in kern/subr_sfbuf.c

The MD allocators were very common, however there were some minor
differencies. These differencies were all consolidated in the MI allocator,
under ifdefs. The defines from machine/vmparam.h turn on features required
for a particular machine. For details look in the comment in sys/sf_buf.h.

As result no MD code left in sys/*/*/vm_machdep.c. Some arches still have
machine/sf_buf.h, which is usually quite small.

Tested by:	glebius (i386), tuexen (arm32), kevlo (arm32)
Reviewed by:	kib
Sponsored by:	Netflix
Sponsored by:	Nginx, Inc.

1 files changed, 4 insertions, 35 deletions

diff --git a/sys/i386/include/sf_buf.h b/sys/i386/include/sf_buf.h
index 20296b3..f1f1cd3 100644
--- a/sys/i386/include/sf_buf.h
+++ b/sys/i386/include/sf_buf.h
@@ -1,5 +1,5 @@
 /*-
- * Copyright (c) 2003, 2005 Alan L. Cox <alc@cs.rice.edu>
+ * Copyright (c) 2014 Gleb Smirnoff <glebius@FreeBSD.org>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -29,39 +29,8 @@
 #ifndef _MACHINE_SF_BUF_H_
 #define _MACHINE_SF_BUF_H_
 
-#include <sys/_cpuset.h>
-#include <sys/queue.h>
-
-struct vm_page;
-
-struct sf_buf {
-	LIST_ENTRY(sf_buf) list_entry;	/* list of buffers */
-	TAILQ_ENTRY(sf_buf) free_entry;	/* list of buffers */
-	struct		vm_page *m;	/* currently mapped page */
-	vm_offset_t	kva;		/* va of mapping */
-	int		ref_count;	/* usage of this mapping */
-#ifdef SMP
-	cpuset_t	cpumask;	/* cpus on which mapping is valid */
-#endif
-};
-
-struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags);
-void sf_buf_free(struct sf_buf *sf);
-
-static __inline vm_offset_t
-sf_buf_kva(struct sf_buf *sf)
-{
-
-	return (sf->kva);
-}
-
-static __inline struct vm_page *
-sf_buf_page(struct sf_buf *sf)
-{
-
-	return (sf->m);
-}
-
-boolean_t sf_buf_invalidate_cache(vm_page_t m);
+void sf_buf_map(struct sf_buf *, int);
+int sf_buf_unmap(struct sf_buf *);
+boolean_t sf_buf_invalidate_cache(vm_page_t);
 
 #endif /* !_MACHINE_SF_BUF_H_ */