[dpdk-dev] [PATCH] cycles: add isb before read cntvct_el0

[Linhaifeng]

We nead isb rather than dsb to sync system counter to cntvct_el0.

Signed-off-by: Haifeng Lin <haifeng....@huawei.com>
---
 lib/librte_eal/common/include/arch/arm/rte_atomic_64.h | 3 +++
 lib/librte_eal/common/include/arch/arm/rte_cycles_64.h | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h 
b/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h
index 859ae129d..705351394 100644
--- a/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h
+++ b/lib/librte_eal/common/include/arch/arm/rte_atomic_64.h
@@ -21,6 +21,7 @@ extern "C" {
 
 #define dsb(opt) asm volatile("dsb " #opt : : : "memory")
 #define dmb(opt) asm volatile("dmb " #opt : : : "memory")
+#define isb()    asm volatile("isb" : : : "memory")
 
 #define rte_mb() dsb(sy)
 
@@ -186,6 +187,8 @@ rte_atomic128_cmp_exchange(rte_int128_t *dst, rte_int128_t 
*exp,
        return (old.int128 == expected.int128);
 }
 
+#define rte_isb() isb()
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/librte_eal/common/include/arch/arm/rte_cycles_64.h 
b/lib/librte_eal/common/include/arch/arm/rte_cycles_64.h
index 68e7c7338..29f524901 100644
--- a/lib/librte_eal/common/include/arch/arm/rte_cycles_64.h
+++ b/lib/librte_eal/common/include/arch/arm/rte_cycles_64.h
@@ -18,6 +18,7 @@ extern "C" {
  *   The time base for this lcore.
  */
 #ifndef RTE_ARM_EAL_RDTSC_USE_PMU
+
 /**
  * This call is portable to any ARMv8 architecture, however, typically
  * cntvct_el0 runs at <= 100MHz and it may be imprecise for some tasks.
@@ -27,6 +28,7 @@ rte_rdtsc(void)
 {
        uint64_t tsc;
 
+       rte_isb();
        asm volatile("mrs %0, cntvct_el0" : "=r" (tsc));
        return tsc;
 }
-- 
2.24.1.windows.2