From 1a5514cbb09aaf694d26ef26fd6da5c5d495cc22 Mon Sep 17 00:00:00 2001 From: Peng Fan Date: Wed, 9 Dec 2020 16:42:05 +0800 Subject: [PATCH] tools/virtio: add barrier for aarch64 Add barrier for aarch64 for cross compiling, and most are from Linux Kernel. Signed-off-by: Peng Fan Link: https://lore.kernel.org/r/20201209084205.24062-4-peng.fan@oss.nxp.com Signed-off-by: Michael S. Tsirkin --- tools/virtio/asm/barrier.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/tools/virtio/asm/barrier.h b/tools/virtio/asm/barrier.h index 04d563fc9b95..468435ed64e6 100644 --- a/tools/virtio/asm/barrier.h +++ b/tools/virtio/asm/barrier.h @@ -16,6 +16,16 @@ # define mb() abort() # define dma_rmb() abort() # define dma_wmb() abort() +#elif defined(__aarch64__) +#define dmb(opt) asm volatile("dmb " #opt : : : "memory") +#define virt_mb() __sync_synchronize() +#define virt_rmb() dmb(ishld) +#define virt_wmb() dmb(ishst) +#define virt_store_mb(var, value) do { WRITE_ONCE(var, value); dmb(ish); } while (0) +/* Weak barriers should be used. If not - it's a bug */ +# define mb() abort() +# define dma_rmb() abort() +# define dma_wmb() abort() #else #error Please fill in barrier macros #endif -- 2.20.1