timer: honor arch-specific TSC frequency query

When calibrating the TSC frequency, first, probe the architecture specific
function. If not available, use the existing calibrate scheme.

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Tested-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>

lib/librte_eal/bsdapp/eal/Makefile

@@ -92,6 +92,7 @@ SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += rte_service.c
 # from arch dir
 SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += rte_cpuflags.c
 SRCS-$(CONFIG_RTE_ARCH_X86) += rte_spinlock.c
+SRCS-y += rte_cycles.c
 
 CFLAGS_eal_common_cpuflags.o := $(CPUFLAGS_LIST)
 

lib/librte_eal/common/arch/arm/rte_cycles.c

@@ -0,0 +1,7 @@
+#include "eal_private.h"
+
+uint64_t
+get_tsc_freq_arch(void)
+{
+	return 0;
+}

lib/librte_eal/common/arch/ppc_64/rte_cycles.c

@@ -0,0 +1,7 @@
+#include "eal_private.h"
+
+uint64_t
+get_tsc_freq_arch(void)
+{
+	return 0;
+}

lib/librte_eal/common/arch/x86/rte_cycles.c

@@ -0,0 +1,7 @@
+#include "eal_private.h"
+
+uint64_t
+get_tsc_freq_arch(void)
+{
+	return 0;
+}

lib/librte_eal/common/eal_common_timer.c

@@ -80,8 +80,11 @@ estimate_tsc_freq(void)
 void
 set_tsc_freq(void)
 {
-	uint64_t freq = get_tsc_freq();
+	uint64_t freq;
 
+	freq = get_tsc_freq_arch();
+	if (!freq)
+		freq = get_tsc_freq();
 	if (!freq)
 		freq = estimate_tsc_freq();
 

lib/librte_eal/common/eal_private.h

@@ -314,6 +314,17 @@ void set_tsc_freq(void);
  */
 uint64_t get_tsc_freq(void);
 
+/**
+ * Get TSC frequency if the architecture supports.
+ *
+ * This function is private to the EAL.
+ *
+ * @return
+ *   The number of TSC cycles in one second.
+ *   Returns zero if the architecture support is not available.
+ */
+uint64_t get_tsc_freq_arch(void);
+
 /**
  * Prepare physical memory mapping
  * i.e. hugepages on Linux and

lib/librte_eal/linuxapp/eal/Makefile

@@ -101,6 +101,7 @@ SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += rte_service.c
 # from arch dir
 SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += rte_cpuflags.c
 SRCS-$(CONFIG_RTE_ARCH_X86) += rte_spinlock.c
+SRCS-y += rte_cycles.c
 
 CFLAGS_eal_common_cpuflags.o := $(CPUFLAGS_LIST)