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* [dpdk-dev] [PATCH v3] eal/ppc64: improve rte_rdtsc() with __ppc_get_timebase()
@ 2020-03-25  0:13 Thinh Tran
  2020-04-16 22:35 ` Thomas Monjalon
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Thinh Tran @ 2020-03-25  0:13 UTC (permalink / raw)
  To: dev, stable; +Cc: david.marchand, drc, Thinh Tran

  __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@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


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2020-04-21 16:17 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-25  0:13 [dpdk-dev] [PATCH v3] eal/ppc64: improve rte_rdtsc() with __ppc_get_timebase() Thinh Tran
2020-04-16 22:35 ` Thomas Monjalon
2020-04-20 16:42 ` David Christensen
2020-04-21 16:17 ` David Marchand

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