[dpdk-dev] [PATCH 1/4] timer: honor arch-specific TSC frequency query

[Thomas Monjalon]

From: Jerin Jacob <jerin.jacob at caviumnetworks.com>

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 at caviumnetworks.com>
Signed-off-by: Thomas Monjalon <thomas at monjalon.net>
---
 lib/librte_eal/bsdapp/eal/Makefile             |  1 +
 lib/librte_eal/common/arch/arm/rte_cycles.c    |  7 +++++++
 lib/librte_eal/common/arch/ppc_64/rte_cycles.c |  7 +++++++
 lib/librte_eal/common/arch/x86/rte_cycles.c    |  7 +++++++
 lib/librte_eal/common/eal_common_timer.c       |  5 ++++-
 lib/librte_eal/common/eal_private.h            | 11 +++++++++++
 lib/librte_eal/linuxapp/eal/Makefile           |  1 +
 7 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 lib/librte_eal/common/arch/arm/rte_cycles.c
 create mode 100644 lib/librte_eal/common/arch/ppc_64/rte_cycles.c
 create mode 100644 lib/librte_eal/common/arch/x86/rte_cycles.c

diff --git a/lib/librte_eal/bsdapp/eal/Makefile b/lib/librte_eal/bsdapp/eal/Makefile
index 317a75ebc..b42306bc3 100644
--- a/lib/librte_eal/bsdapp/eal/Makefile
+++ b/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)
 
diff --git a/lib/librte_eal/common/arch/arm/rte_cycles.c b/lib/librte_eal/common/arch/arm/rte_cycles.c
new file mode 100644
index 000000000..851fd0255
--- /dev/null
+++ b/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;
+}
diff --git a/lib/librte_eal/common/arch/ppc_64/rte_cycles.c b/lib/librte_eal/common/arch/ppc_64/rte_cycles.c
new file mode 100644
index 000000000..851fd0255
--- /dev/null
+++ b/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;
+}
diff --git a/lib/librte_eal/common/arch/x86/rte_cycles.c b/lib/librte_eal/common/arch/x86/rte_cycles.c
new file mode 100644
index 000000000..851fd0255
--- /dev/null
+++ b/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;
+}
diff --git a/lib/librte_eal/common/eal_common_timer.c b/lib/librte_eal/common/eal_common_timer.c
index ed0b16d05..5980b294e 100644
--- a/lib/librte_eal/common/eal_common_timer.c
+++ b/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();
 
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index 597d82e44..6e0f85def 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/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
diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile
index 21e0b4aad..140d1acfa 100644
--- a/lib/librte_eal/linuxapp/eal/Makefile
+++ b/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)
 
-- 
2.14.1