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[1/2] libibverbs: add ARM64 memory barrier macros

Message ID 4891ced7a08a643b9daf697a45e198f9284674d1.1465310573.git.root@r9.asicdesigners.com (mailing list archive)
State Accepted
Headers show

Commit Message

Steve Wise June 7, 2016, 2:42 p.m. UTC 
The default generic barriers are not correct for ARM64. This results
in data corruption.  The correct macros are based on the ARM Compiler
Toolchain Assembler Reference documenation.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
---
 include/infiniband/arch.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
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Patch

diff --git a/include/infiniband/arch.h b/include/infiniband/arch.h
index bc1738a..c31dd0a 100644
--- a/include/infiniband/arch.h
+++ b/include/infiniband/arch.h
@@ -122,6 +122,14 @@  static inline uint64_t ntohll(uint64_t x) { return x; }
 #define wmb()	mb()					/* for s390x */
 #define wc_wmb() wmb()					/* for s390x */
 
+#elif defined(__aarch64__)
+
+/* Perhaps dmb would be sufficient? Let us be conservative for now. */
+#define mb()	{ asm volatile("dsb sy" ::: "memory"); }
+#define rmb()	{ asm volatile("dsb ld" ::: "memory"); }
+#define wmb()	{ asm volatile("dsb st" ::: "memory"); }
+#define wc_wmb() wmb()
+
 #else
 
 #warning No architecture specific defines found.  Using generic implementation.