arm64: Add support for trace synchronization barrier

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

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20210405164307.1720226-4-suzuki.poulose@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index c3009b0..5a8367a 100644 (file)
--- 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",              \