Implement clock plugin support

[lttng-modules.git] / wrapper / trace-clock.h

diff --git a/wrapper/trace-clock.h b/wrapper/trace-clock.h
index d7d18429ba1c1f17d22d35c4ce6ec8484aef422e..d2b7f19dba76e197738d055217250d38767bd816 100644 (file)
--- a/wrapper/trace-clock.h
+++ b/wrapper/trace-clock.h
@@ -36,6 +36,7 @@
 #include <linux/version.h>
 #include <asm/local.h>
 #include "../lttng-kernel-version.h"
+#include "../lttng-clock.h"
 #include "percpu-defs.h"
 #include "random.h"
 
@@ -44,6 +45,8 @@
 #error "Linux kernels 3.10 and 3.11 introduce a deadlock in the timekeeping subsystem. Fixed by commit 7bd36014460f793c19e7d6c94dab67b0afcfcb7f \"timekeeping: Fix HRTICK related deadlock from ntp lock changes\" in Linux."
 #endif
 
+extern struct lttng_trace_clock *lttng_trace_clock;
+
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0))
 
 DECLARE_PER_CPU(local_t, lttng_last_tsc);
@@ -142,21 +145,31 @@ static inline u64 trace_clock_monotonic_wrapper(void)
 }
 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)) */
 
-static inline u64 trace_clock_read64(void)
+static inline u64 trace_clock_read64_monotonic(void)
 {
        return (u64) trace_clock_monotonic_wrapper();
 }
 
-static inline u64 trace_clock_freq(void)
+static inline u64 trace_clock_freq_monotonic(void)
 {
        return (u64) NSEC_PER_SEC;
 }
 
-static inline int trace_clock_uuid(char *uuid)
+static inline int trace_clock_uuid_monotonic(char *uuid)
 {
        return wrapper_get_bootid(uuid);
 }
 
+static inline const char *trace_clock_name_monotonic(void)
+{
+       return "monotonic";
+}
+
+static inline const char *trace_clock_description_monotonic(void)
+{
+       return "Monotonic Clock";
+}
+
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0))
 static inline int get_trace_clock(void)
 {
@@ -175,6 +188,67 @@ static inline void put_trace_clock(void)
 {
 }
 
+static inline u64 trace_clock_read64(void)
+{
+       struct lttng_trace_clock *ltc = ACCESS_ONCE(lttng_trace_clock);
+
+       if (likely(!ltc)) {
+               return trace_clock_read64_monotonic();
+       } else {
+               read_barrier_depends(); /* load ltc before content */
+               return ltc->read64();
+       }
+}
+
+static inline u64 trace_clock_freq(void)
+{
+       struct lttng_trace_clock *ltc = ACCESS_ONCE(lttng_trace_clock);
+
+       if (!ltc) {
+               return trace_clock_freq_monotonic();
+       } else {
+               read_barrier_depends(); /* load ltc before content */
+               return ltc->freq();
+       }
+}
+
+static inline int trace_clock_uuid(char *uuid)
+{
+       struct lttng_trace_clock *ltc = ACCESS_ONCE(lttng_trace_clock);
+
+       read_barrier_depends(); /* load ltc before content */
+       /* Use default UUID cb when NULL */
+       if (!ltc || !ltc->uuid) {
+               return trace_clock_uuid_monotonic(uuid);
+       } else {
+               return ltc->uuid(uuid);
+       }
+}
+
+static inline const char *trace_clock_name(void)
+{
+       struct lttng_trace_clock *ltc = ACCESS_ONCE(lttng_trace_clock);
+
+       if (!ltc) {
+               return trace_clock_name_monotonic();
+       } else {
+               read_barrier_depends(); /* load ltc before content */
+               return ltc->name();
+       }
+}
+
+static inline const char *trace_clock_description(void)
+{
+       struct lttng_trace_clock *ltc = ACCESS_ONCE(lttng_trace_clock);
+
+       if (!ltc) {
+               return trace_clock_description_monotonic();
+       } else {
+               read_barrier_depends(); /* load ltc before content */
+               return ltc->description();
+       }
+}
+
 #endif /* CONFIG_HAVE_TRACE_CLOCK */
 
 #endif /* _LTTNG_TRACE_CLOCK_H */