Commit the support for removing cpumask_t and replacing it directly with

cpuset_t objects.
That is going to offer the underlying support for a simple bump of
MAXCPU and then support for number of cpus > 32 (as it is today).

Right now, cpumask_t is an int, 32 bits on all our supported architecture.
cpumask_t on the other side is implemented as an array of longs, and
easilly extendible by definition.

The architectures touched by this commit are the following:
- amd64
- i386
- pc98
- arm
- ia64
- XEN

while the others are still missing.
Userland is believed to be fully converted with the changes contained
here.

Some technical notes:
- This commit may be considered an ABI nop for all the architectures
  different from amd64 and ia64 (and sparc64 in the future)
- per-cpu members, which are now converted to cpuset_t, needs to be
  accessed avoiding migration, because the size of cpuset_t should be
  considered unknown
- size of cpuset_t objects is different from kernel and userland (this is
  primirally done in order to leave some more space in userland to cope
  with KBI extensions). If you need to access kernel cpuset_t from the
  userland please refer to example in this patch on how to do that
  correctly (kgdb may be a good source, for example).
- Support for other architectures is going to be added soon
- Only MAXCPU for amd64 is bumped now

The patch has been tested by sbruno and Nicholas Esborn on opteron
4 x 12 pack CPUs. More testing on big SMP is expected to came soon.
pluknet tested the patch with his 8-ways on both amd64 and i386.

Tested by:	pluknet, sbruno, gianni, Nicholas Esborn
Reviewed by:	jeff, jhb, sbruno

1 files changed, 47 insertions, 15 deletions

diff --git a/sys/sys/cpuset.h b/sys/sys/cpuset.h
index 3263991..e06df54 100644
--- a/sys/sys/cpuset.h
+++ b/sys/sys/cpuset.h
@@ -32,22 +32,9 @@
 #ifndef _SYS_CPUSET_H_
 #define	_SYS_CPUSET_H_
 
-#ifdef _KERNEL
-#define	CPU_SETSIZE	MAXCPU
-#endif
+#include <sys/_cpuset.h>
 
-#define	CPU_MAXSIZE	(4 * MAXCPU)
-
-#ifndef	CPU_SETSIZE
-#define	CPU_SETSIZE	CPU_MAXSIZE
-#endif
-
-#define	_NCPUBITS	(sizeof(long) * NBBY)	/* bits per mask */
-#define	_NCPUWORDS	howmany(CPU_SETSIZE, _NCPUBITS)
-
-typedef	struct _cpuset {
-	long	__bits[howmany(CPU_SETSIZE, _NCPUBITS)];
-} cpuset_t;
+#define	CPUSETBUFSIZ	((2 + sizeof(long) * 2) * _NCPUWORDS)
 
 #define	__cpuset_mask(n)	((long)1 << ((n) % _NCPUBITS))
 #define	CPU_CLR(n, p)	((p)->__bits[(n)/_NCPUBITS] &= ~__cpuset_mask(n))
@@ -66,6 +53,11 @@ typedef	struct _cpuset {
 		(p)->__bits[__i] = -1;			\
 } while (0)
 
+#define	CPU_SETOF(n, p) do {					\
+	CPU_ZERO(p);						\
+	((p)->__bits[(n)/_NCPUBITS] = __cpuset_mask(n));	\
+} while (0)
+
 /* Is p empty. */
 #define	CPU_EMPTY(p) __extension__ ({			\
 	__size_t __i;					\
@@ -75,6 +67,15 @@ typedef	struct _cpuset {
 	__i == _NCPUWORDS;				\
 })
 
+/* Is p full set. */
+#define	CPU_ISFULLSET(p) __extension__ ({		\
+	__size_t __i;					\
+	for (__i = 0; __i < _NCPUWORDS; __i++)		\
+		if ((p)->__bits[__i] != (long)-1)	\
+			break;				\
+	__i == _NCPUWORDS;				\
+})
+
 /* Is c a subset of p. */
 #define	CPU_SUBSET(p, c) __extension__ ({		\
 	__size_t __i;					\
@@ -124,6 +125,35 @@ typedef	struct _cpuset {
 		(d)->__bits[__i] &= ~(s)->__bits[__i];	\
 } while (0)
 
+#ifdef _KERNEL
+#define	CPU_CLR_ATOMIC(n, p)						\
+	atomic_clear_long(&(p)->__bits[(n)/_NCPUBITS], __cpuset_mask(n))
+
+#define	CPU_SET_ATOMIC(n, p)						\
+	atomic_set_long(&(p)->__bits[(n)/_NCPUBITS], __cpuset_mask(n))
+
+#define	CPU_OR_ATOMIC(d, s) do {			\
+	__size_t __i;					\
+	for (__i = 0; __i < _NCPUWORDS; __i++)		\
+		atomic_set_long(&(d)->__bits[__i],	\
+		    (s)->__bits[__i]);			\
+} while (0)
+
+#define	CPU_NAND_ATOMIC(d, s) do {			\
+	__size_t __i;					\
+	for (__i = 0; __i < _NCPUWORDS; __i++)		\
+		atomic_clear_long(&(d)->__bits[__i],	\
+		    (s)->__bits[__i]);			\
+} while (0)
+
+#define	CPU_COPY_STORE_REL(f, t) do {				\
+	__size_t __i;						\
+	for (__i = 0; __i < _NCPUWORDS; __i++)			\
+		atomic_store_rel_long(&(t)->__bits[__i],	\
+		    (f)->__bits[__i]);				\
+} while (0)
+#endif /* !_KERNEL */
+
 /*
  * Valid cpulevel_t values.
  */
@@ -184,6 +214,8 @@ void	cpuset_rel(struct cpuset *);
 int	cpuset_setthread(lwpid_t id, cpuset_t *);
 int	cpuset_create_root(struct prison *, struct cpuset **);
 int	cpuset_setproc_update_set(struct proc *, struct cpuset *);
+int	cpusetobj_ffs(const cpuset_t *);
+char	*cpusetobj_strprint(char *, const cpuset_t *);
 
 #else
 __BEGIN_DECLS