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authorJackie Liu <liuyun01@kylinos.cn>2019-08-09 10:40:39 +0800
committerJens Axboe <axboe@kernel.dk>2019-08-08 21:37:04 -0600
commit0520db454c29f1d96cda6cf6cedeb93df65301e8 (patch)
tree5a5ec8b32b56d7e3edd82f3d54731ecec90ad17b
parent72d7f5a5fa82686fd0b37b1c3ac293c8b3e5f6db (diff)
downloadliburing-0520db454c29f1d96cda6cf6cedeb93df65301e8.tar.gz
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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>
-rw-r--r--src/include/liburing/barrier.h15
1 files changed, 14 insertions, 1 deletions
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.