From owner-svn-src-all@FreeBSD.ORG Sun Apr 22 22:27:36 2012 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3F68C106564A; Sun, 22 Apr 2012 22:27:36 +0000 (UTC) (envelope-from nwhitehorn@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id 206678FC08; Sun, 22 Apr 2012 22:27:36 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id q3MMRZFh063180; Sun, 22 Apr 2012 22:27:35 GMT (envelope-from nwhitehorn@svn.freebsd.org) Received: (from nwhitehorn@localhost) by svn.freebsd.org (8.14.4/8.14.4/Submit) id q3MMRZ9T063178; Sun, 22 Apr 2012 22:27:35 GMT (envelope-from nwhitehorn@svn.freebsd.org) Message-Id: <201204222227.q3MMRZ9T063178@svn.freebsd.org> From: Nathan Whitehorn Date: Sun, 22 Apr 2012 22:27:35 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r234590 - head/sys/powerpc/include X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 Apr 2012 22:27:36 -0000 Author: nwhitehorn Date: Sun Apr 22 22:27:35 2012 New Revision: 234590 URL: http://svn.freebsd.org/changeset/base/234590 Log: Provide a clearer split between read/write and acquire/release barriers. This should really, actually be correct now. Modified: head/sys/powerpc/include/atomic.h Modified: head/sys/powerpc/include/atomic.h ============================================================================== --- head/sys/powerpc/include/atomic.h Sun Apr 22 21:55:19 2012 (r234589) +++ head/sys/powerpc/include/atomic.h Sun Apr 22 22:27:35 2012 (r234590) @@ -38,20 +38,25 @@ /* NOTE: lwsync is equivalent to sync on systems without lwsync */ #define mb() __asm __volatile("lwsync" : : : "memory") +#ifdef __powerpc64__ +#define rmb() __asm __volatile("lwsync" : : : "memory") #define wmb() __asm __volatile("lwsync" : : : "memory") +#else #define rmb() __asm __volatile("lwsync" : : : "memory") +#define wmb() __asm __volatile("eieio" : : : "memory") +#endif /* - * The __ATOMIC_XMB() macros provide memory barriers only in conjunction + * The __ATOMIC_REL/ACQ() macros provide memory barriers only in conjunction * with the atomic lXarx/stXcx. sequences below. See Appendix B.2 of Book II * of the architecture manual. */ #ifdef __powerpc64__ -#define __ATOMIC_WMB() __asm __volatile("lwsync" : : : "memory") -#define __ATOMIC_RMB() __asm __volatile("lwsync" : : : "memory") +#define __ATOMIC_REL() __asm __volatile("lwsync" : : : "memory") +#define __ATOMIC_ACQ() __asm __volatile("lwsync" : : : "memory") #else -#define __ATOMIC_WMB() __asm __volatile("eieio" : : : "memory") -#define __ATOMIC_RMB() __asm __volatile("isync" : : : "memory") +#define __ATOMIC_REL() __asm __volatile("lwsync" : : : "memory") +#define __ATOMIC_ACQ() __asm __volatile("isync" : : : "memory") #endif /* @@ -105,13 +110,13 @@ atomic_add_acq_##type(volatile u_##type *p, u_##type v) { \ u_##type t; \ __atomic_add_##type(p, v, t); \ - __ATOMIC_RMB(); \ + __ATOMIC_ACQ(); \ } \ \ static __inline void \ atomic_add_rel_##type(volatile u_##type *p, u_##type v) { \ u_##type t; \ - __ATOMIC_WMB(); \ + __ATOMIC_REL(); \ __atomic_add_##type(p, v, t); \ } \ /* _ATOMIC_ADD */ @@ -191,13 +196,13 @@ _ATOMIC_ADD(long) atomic_clear_acq_##type(volatile u_##type *p, u_##type v) { \ u_##type t; \ __atomic_clear_##type(p, v, t); \ - __ATOMIC_RMB(); \ + __ATOMIC_ACQ(); \ } \ \ static __inline void \ atomic_clear_rel_##type(volatile u_##type *p, u_##type v) { \ u_##type t; \ - __ATOMIC_WMB(); \ + __ATOMIC_REL(); \ __atomic_clear_##type(p, v, t); \ } \ /* _ATOMIC_CLEAR */ @@ -293,13 +298,13 @@ _ATOMIC_CLEAR(long) atomic_set_acq_##type(volatile u_##type *p, u_##type v) { \ u_##type t; \ __atomic_set_##type(p, v, t); \ - __ATOMIC_RMB(); \ + __ATOMIC_ACQ(); \ } \ \ static __inline void \ atomic_set_rel_##type(volatile u_##type *p, u_##type v) { \ u_##type t; \ - __ATOMIC_WMB(); \ + __ATOMIC_REL(); \ __atomic_set_##type(p, v, t); \ } \ /* _ATOMIC_SET */ @@ -379,13 +384,13 @@ _ATOMIC_SET(long) atomic_subtract_acq_##type(volatile u_##type *p, u_##type v) { \ u_##type t; \ __atomic_subtract_##type(p, v, t); \ - __ATOMIC_RMB(); \ + __ATOMIC_ACQ(); \ } \ \ static __inline void \ atomic_subtract_rel_##type(volatile u_##type *p, u_##type v) { \ u_##type t; \ - __ATOMIC_WMB(); \ + __ATOMIC_REL(); \ __atomic_subtract_##type(p, v, t); \ } \ /* _ATOMIC_SUBTRACT */ @@ -492,14 +497,14 @@ atomic_load_acq_##TYPE(volatile u_##TYPE u_##TYPE v; \ \ v = *p; \ - rmb(); \ + mb(); \ return (v); \ } \ \ static __inline void \ atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v) \ { \ - wmb(); \ + mb(); \ *p = v; \ } @@ -609,14 +614,14 @@ atomic_cmpset_acq_int(volatile u_int *p, int retval; retval = atomic_cmpset_int(p, cmpval, newval); - __ATOMIC_RMB(); + __ATOMIC_ACQ(); return (retval); } static __inline int atomic_cmpset_rel_int(volatile u_int *p, u_int cmpval, u_int newval) { - wmb(); + __ATOMIC_REL(); return (atomic_cmpset_int(p, cmpval, newval)); } @@ -626,14 +631,14 @@ atomic_cmpset_acq_long(volatile u_long * u_long retval; retval = atomic_cmpset_long(p, cmpval, newval); - __ATOMIC_RMB(); + __ATOMIC_ACQ(); return (retval); } static __inline int atomic_cmpset_rel_long(volatile u_long *p, u_long cmpval, u_long newval) { - wmb(); + __ATOMIC_REL(); return (atomic_cmpset_long(p, cmpval, newval)); }