[dpdk-dev] [PATCH v3] eal/ppc64: improve rte_rdtsc() with __ppc_get_timebase()
Thinh Tran
thinhtr at linux.vnet.ibm.com
Wed Mar 25 01:13:56 CET 2020
__ppc_get_timebase() reads and returns the current value of the Time
Base Register. It's more efficient as it uses the processor’s time
base facility directly
the DPDK on FreeBSD currently is not supported on Powerpc64, it should
be safe to include the sys/platform/ppc.h
Signed-off-by: Thinh Tran <thinhtr at linux.vnet.ibm.com>
---
.../common/include/arch/ppc_64/rte_cycles.h | 28 ++-----------------
1 file changed, 2 insertions(+), 26 deletions(-)
diff --git a/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h b/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h
index 8f2e98642..871f9b6e4 100644
--- a/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h
+++ b/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h
@@ -14,6 +14,7 @@ extern "C" {
#include <rte_byteorder.h>
#include <rte_common.h>
+#include <sys/platform/ppc.h>
/**
* Read the time base register.
@@ -24,32 +25,7 @@ extern "C" {
static inline uint64_t
rte_rdtsc(void)
{
- union {
- uint64_t tsc_64;
- RTE_STD_C11
- struct {
-#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
- uint32_t hi_32;
- uint32_t lo_32;
-#else
- uint32_t lo_32;
- uint32_t hi_32;
-#endif
- };
- } tsc;
- uint32_t tmp;
-
- asm volatile(
- "0:\n"
- "mftbu %[hi32]\n"
- "mftb %[lo32]\n"
- "mftbu %[tmp]\n"
- "cmpw %[tmp],%[hi32]\n"
- "bne 0b\n"
- : [hi32] "=r"(tsc.hi_32), [lo32] "=r"(tsc.lo_32),
- [tmp] "=r"(tmp)
- );
- return tsc.tsc_64;
+ return __ppc_get_timebase();
}
static inline uint64_t
--
2.17.0
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