From 0520db454c29f1d96cda6cf6cedeb93df65301e8 Mon Sep 17 00:00:00 2001
From: Jackie Liu <liuyun01@kylinos.cn>
Date: Fri, 9 Aug 2019 10:40:39 +0800
Subject: Add arm64 memory barriers support
making liburing on arm64 platform failed. let's support it.
root@Kylin:/# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux buster/sid"
root@Kylin:/# gcc -v
gcc version 8.2.0 (Debian 8.2.0-20)
root@Kylin:~/liburing# make
make[1]: Entering directory '/root/liburing/src'
cc -g -fomit-frame-pointer -O2 -Wall -Iinclude/ -c -o setup.ol setup.c
In file included from include/liburing.h:14,
from setup.c:10:
include/liburing.h: In function 'io_uring_cq_advance':
include/liburing/barrier.h:73:2: warning: implicit declaration of function 'smp_mb'; did you mean 'smp_wmb'? [-Wimplicit-function-declaration]
smp_mb(); \
^~~~~~
include/liburing.h:111:3: note: in expansion of macro 'smp_store_release'
smp_store_release(cq->khead, *cq->khead + nr);
^~~~~~~~~~~~~~~~~
Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
src/include/liburing/barrier.h | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/src/include/liburing/barrier.h b/src/include/liburing/barrier.h
index 98be9e5..b98193b 100644
--- a/src/include/liburing/barrier.h
+++ b/src/include/liburing/barrier.h
@@ -56,7 +56,20 @@ do { \
barrier(); \
___p1; \
})
-#else /* defined(__x86_64__) || defined(__i386__) */
+
+#elif defined(__aarch64__)
+/* Adapted from arch/arm64/include/asm/barrier.h */
+#define dmb(opt) asm volatile("dmb " #opt : : : "memory")
+#define dsb(opt) asm volatile("dsb " #opt : : : "memory")
+
+#define mb() dsb(sy)
+#define rmb() dsb(ld)
+#define wmb() dsb(st)
+#define smp_mb() dmb(ish)
+#define smp_rmb() dmb(ishld)
+#define smp_wmb() dmb(ishst)
+
+#else /* defined(__x86_64__) || defined(__i386__) || defined(__aarch64__) */
/*
* Add arch appropriate definitions. Be safe and use full barriers for
* archs we don't have support for.
--
cgit