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From: Ian Campbell <ian.campbell@citrix.com>
To: xen-devel@lists.xen.org
Cc: julien.grall@citrix.com, tim@xen.org,
	Ian Campbell <ian.campbell@citrix.com>,
	stefano.stabellini@eu.citrix.com
Subject: [PATCH 10/10] xen: arm: use more specific barriers for read and write barriers.
Date: Fri, 28 Jun 2013 17:10:56 +0100	[thread overview]
Message-ID: <1372435856-14040-10-git-send-email-ian.campbell@citrix.com> (raw)
In-Reply-To: <1372435809.8976.169.camel@zakaz.uk.xensource.com>

Note that 32-bit does not provide a load variant of the inner shareable
barrier, so that remains a full any-any barrier.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
---
 xen/include/asm-arm/system.h |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/xen/include/asm-arm/system.h b/xen/include/asm-arm/system.h
index 7c3e42d..efaf645 100644
--- a/xen/include/asm-arm/system.h
+++ b/xen/include/asm-arm/system.h
@@ -17,12 +17,17 @@
 #define dmb(scope)      asm volatile("dmb " scope : : : "memory")
 
 #define mb()            dsb("sy")
-#define rmb()           dsb("sy")
-#define wmb()           dsb("sy")
+#define rmb()           dsb("ld")
+#define wmb()           dsb("st")
 
 #define smp_mb()        dmb("ish")
-#define smp_rmb()       dmb("ish")
-#define smp_wmb()       dmb("ish")
+#ifdef CONFIG_ARM_64
+#define smp_rmb()       dmb("ishld")
+#else
+#define smp_rmb()       dmb("ish") /* 32-bit has no ishld variant. */
+#endif
+
+#define smp_wmb()       dmb("ishst")
 
 #define xchg(ptr,x) \
         ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
-- 
1.7.2.5

  parent reply	other threads:[~2013-06-28 16:10 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-28 16:10 [PATCH 00/10] xen: arm: map normal memory as inner shareable, reduce scope of various barriers Ian Campbell
2013-06-28 16:10 ` [PATCH 01/10] xen: arm: map memory as inner shareable Ian Campbell
2013-07-01 15:39   ` Stefano Stabellini
2013-07-01 15:42     ` Ian Campbell
2013-07-02 14:09   ` Leif Lindholm
2013-07-02 14:26     ` Ian Campbell
2013-07-04 10:58   ` Tim Deegan
2013-07-04 11:03     ` Ian Campbell
2013-06-28 16:10 ` [PATCH 02/10] xen: arm: Only upgrade guest barriers to " Ian Campbell
2013-07-01 15:24   ` Stefano Stabellini
2013-07-04 10:58   ` Tim Deegan
2013-06-28 16:10 ` [PATCH 03/10] xen: arm: reduce instruction cache and tlb flushes to inner-shareable Ian Campbell
2013-07-01 15:25   ` Stefano Stabellini
2013-07-04 11:07   ` Tim Deegan
2013-07-04 11:19     ` Tim Deegan
2013-07-04 11:21       ` Tim Deegan
2013-06-28 16:10 ` [PATCH 04/10] xen: arm: consolidate barrier definitions Ian Campbell
2013-07-01 15:25   ` Stefano Stabellini
2013-07-04 11:07   ` Tim Deegan
2013-06-28 16:10 ` [PATCH 05/10] xen: use SMP barrier in common code dealing with shared memory protocols Ian Campbell
2013-06-28 16:15   ` Ian Campbell
2013-06-28 16:20   ` Keir Fraser
2013-07-04 11:26   ` Tim Deegan
2013-06-28 16:10 ` [PATCH 06/10] xen: arm: Use SMP barriers when that is all which is required Ian Campbell
2013-07-01 15:19   ` Stefano Stabellini
2013-07-01 15:24     ` Ian Campbell
2013-07-04 11:30       ` Tim Deegan
2013-06-28 16:10 ` [PATCH 07/10] xen: arm: Use dmb for smp barriers Ian Campbell
2013-07-01 15:20   ` Stefano Stabellini
2013-07-04 11:31   ` Tim Deegan
2013-06-28 16:10 ` [PATCH 08/10] xen: arm: add scope to dsb and dmb macros Ian Campbell
2013-07-01 15:21   ` Stefano Stabellini
2013-07-01 15:22     ` Stefano Stabellini
2013-07-04 11:44   ` (no subject) Tim Deegan
2013-06-28 16:10 ` [PATCH 09/10] xen: arm: weaken SMP barriers to inner shareable Ian Campbell
2013-07-01 15:21   ` Stefano Stabellini
2013-07-01 15:22     ` Stefano Stabellini
2013-07-04 11:35   ` Tim Deegan
2013-06-28 16:10 ` Ian Campbell [this message]
2013-07-01 15:22   ` [PATCH 10/10] xen: arm: use more specific barriers for read and write barriers Stefano Stabellini
2013-07-04 11:42   ` Tim Deegan
2013-07-04 11:46     ` Ian Campbell
2013-06-28 16:11 ` [PATCH 00/10] xen: arm: map normal memory as inner shareable, reduce scope of various barriers Ian Campbell
2013-07-04 11:32 (no subject) Tim Deegan

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