[PATCH v6 03/20] arm64: Add support for trace synchronization barrier

[Suzuki K Poulose]

tsb csync synchronizes the trace operation of instructions.
The instruction is a nop when FEAT_TRF is not implemented.

Cc: Mathieu Poirier <mathieu.poirier at linaro.org>
Cc: Mike Leach <mike.leach at linaro.org>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will.deacon at arm.com>
Acked-by: Catalin Marinas <catalin.marinas at arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
---
 arch/arm64/include/asm/barrier.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index c3009b0e5239..5a8367a2b868 100644
--- a/arch/arm64/include/asm/barrier.h
+++ b/arch/arm64/include/asm/barrier.h
@@ -23,6 +23,7 @@
 #define dsb(opt)	asm volatile("dsb " #opt : : : "memory")
 
 #define psb_csync()	asm volatile("hint #17" : : : "memory")
+#define tsb_csync()	asm volatile("hint #18" : : : "memory")
 #define csdb()		asm volatile("hint #20" : : : "memory")
 
 #define spec_bar()	asm volatile(ALTERNATIVE("dsb nsh\nisb\n",		\
-- 
2.24.1