diff options
Diffstat (limited to 'include/sys/trace.h')
| -rw-r--r-- | include/sys/trace.h | 133 |
1 files changed, 126 insertions, 7 deletions
diff --git a/include/sys/trace.h b/include/sys/trace.h index f32ba529e..48497cc35 100644 --- a/include/sys/trace.h +++ b/include/sys/trace.h @@ -19,7 +19,35 @@ * CDDL HEADER END */ -#if defined(_KERNEL) && defined(HAVE_DECLARE_EVENT_CLASS) +#if defined(_KERNEL) + +/* + * Calls to DTRACE_PROBE* are mapped to standard Linux kernel trace points + * when they are available(when HAVE_DECLARE_EVENT_CLASS is defined). The + * tracepoint event class definitions are found in the general tracing + * header file: include/sys/trace_*.h. See include/sys/trace_vdev.h for + * a good example. + * + * If tracepoints are not available, stub functions are generated which can + * be traced using kprobes. In this case, the DEFINE_DTRACE_PROBE* macros + * are used to provide the stub functions and also the prototypes for + * those functions. The mechanism to do this relies on DEFINE_DTRACE_PROBE + * macros defined in the general tracing headers(see trace_vdev.h) and + * CREATE_TRACE_POINTS being defined only in module/zfs/trace.c. When ZFS + * source files include the general tracing headers, e.g. + * module/zfs/vdev_removal.c including trace_vdev.h, DTRACE_PROBE calls + * are mapped to stub functions calls and prototypes for those calls are + * declared via DEFINE_DTRACE_PROBE*. Only module/zfs/trace.c defines + * CREATE_TRACE_POINTS. That is follwed by includes of all the general + * tracing headers thereby defining all stub functions in one place via + * the DEFINE_DTRACE_PROBE macros. + * + * When adding new DTRACE_PROBEs to zfs source, both a tracepoint event + * class defintition and a DEFINE_DTRACE_PROBE definition are needed to + * avoid undefined function errors. + */ + +#if defined(HAVE_DECLARE_EVENT_CLASS) #undef TRACE_SYSTEM #define TRACE_SYSTEM zfs @@ -39,21 +67,21 @@ #undef _SYS_TRACE_DBGMSG_INDIRECT /* - * Redefine the DTRACE_PROBE* functions to use Linux tracepoints + * DTRACE_PROBE with 0 arguments is not currently available with + * tracepoint events */ -#undef DTRACE_PROBE1 +#define DTRACE_PROBE(name) \ + ((void)0) + #define DTRACE_PROBE1(name, t1, arg1) \ trace_zfs_##name((arg1)) -#undef DTRACE_PROBE2 #define DTRACE_PROBE2(name, t1, arg1, t2, arg2) \ trace_zfs_##name((arg1), (arg2)) -#undef DTRACE_PROBE3 #define DTRACE_PROBE3(name, t1, arg1, t2, arg2, t3, arg3) \ trace_zfs_##name((arg1), (arg2), (arg3)) -#undef DTRACE_PROBE4 #define DTRACE_PROBE4(name, t1, arg1, t2, arg2, t3, arg3, t4, arg4) \ trace_zfs_##name((arg1), (arg2), (arg3), (arg4)) @@ -65,4 +93,95 @@ #define TRACE_INCLUDE_FILE trace #include <trace/define_trace.h> -#endif /* _KERNEL && HAVE_DECLARE_EVENT_CLASS */ +#else /* HAVE_DECLARE_EVENT_CLASS */ + +#define DTRACE_PROBE(name) \ + trace_zfs_##name() + +#define DTRACE_PROBE1(name, t1, arg1) \ + trace_zfs_##name((uintptr_t)(arg1)) + +#define DTRACE_PROBE2(name, t1, arg1, t2, arg2) \ + trace_zfs_##name((uintptr_t)(arg1), (uintptr_t)(arg2)) + +#define DTRACE_PROBE3(name, t1, arg1, t2, arg2, t3, arg3) \ + trace_zfs_##name((uintptr_t)(arg1), (uintptr_t)(arg2), \ + (uintptr_t)(arg3)) + +#define DTRACE_PROBE4(name, t1, arg1, t2, arg2, t3, arg3, t4, arg4) \ + trace_zfs_##name((uintptr_t)(arg1), (uintptr_t)(arg2), \ + (uintptr_t)(arg3), (uintptr_t)(arg4)) + +#if defined(CREATE_TRACE_POINTS) + +#define FUNC_DTRACE_PROBE(name) \ +noinline void trace_zfs_##name(void) { } \ +EXPORT_SYMBOL(trace_zfs_##name) + +#define FUNC_DTRACE_PROBE1(name) \ +noinline void trace_zfs_##name(uintptr_t arg1) { } \ +EXPORT_SYMBOL(trace_zfs_##name) + +#define FUNC_DTRACE_PROBE2(name) \ +noinline void trace_zfs_##name(uintptr_t arg1, \ + uintptr_t arg2) { } \ +EXPORT_SYMBOL(trace_zfs_##name) + +#define FUNC_DTRACE_PROBE3(name) \ +noinline void trace_zfs_##name(uintptr_t arg1, \ + uintptr_t arg2, uintptr_t arg3) { } \ +EXPORT_SYMBOL(trace_zfs_##name) + +#define FUNC_DTRACE_PROBE4(name) \ +noinline void trace_zfs_##name(uintptr_t arg1, \ + uintptr_t arg2, uintptr_t arg3, uintptr_t arg4) { } \ +EXPORT_SYMBOL(trace_zfs_##name) + +#undef DEFINE_DTRACE_PROBE +#define DEFINE_DTRACE_PROBE(name) FUNC_DTRACE_PROBE(name) + +#undef DEFINE_DTRACE_PROBE1 +#define DEFINE_DTRACE_PROBE1(name) FUNC_DTRACE_PROBE1(name) + +#undef DEFINE_DTRACE_PROBE2 +#define DEFINE_DTRACE_PROBE2(name) FUNC_DTRACE_PROBE2(name) + +#undef DEFINE_DTRACE_PROBE3 +#define DEFINE_DTRACE_PROBE3(name) FUNC_DTRACE_PROBE3(name) + +#undef DEFINE_DTRACE_PROBE4 +#define DEFINE_DTRACE_PROBE4(name) FUNC_DTRACE_PROBE4(name) + +#else /* CREATE_TRACE_POINTS */ + +#define PROTO_DTRACE_PROBE(name) \ + noinline void trace_zfs_##name(void) +#define PROTO_DTRACE_PROBE1(name) \ + noinline void trace_zfs_##name(uintptr_t) +#define PROTO_DTRACE_PROBE2(name) \ + noinline void trace_zfs_##name(uintptr_t, uintptr_t) +#define PROTO_DTRACE_PROBE3(name) \ + noinline void trace_zfs_##name(uintptr_t, uintptr_t, \ + uintptr_t) +#define PROTO_DTRACE_PROBE4(name) \ + noinline void trace_zfs_##name(uintptr_t, uintptr_t, \ + uintptr_t, uintptr_t) + +#define DEFINE_DTRACE_PROBE(name) PROTO_DTRACE_PROBE(name) +#define DEFINE_DTRACE_PROBE1(name) PROTO_DTRACE_PROBE1(name) +#define DEFINE_DTRACE_PROBE2(name) PROTO_DTRACE_PROBE2(name) +#define DEFINE_DTRACE_PROBE3(name) PROTO_DTRACE_PROBE3(name) +#define DEFINE_DTRACE_PROBE4(name) PROTO_DTRACE_PROBE4(name) + +#endif /* CREATE_TRACE_POINTS */ + +/* + * The sys/trace_dbgmsg.h header defines tracepoint events for + * dprintf(), dbgmsg(), and SET_ERROR(). + */ +#define _SYS_TRACE_DBGMSG_INDIRECT +#include <sys/trace_dbgmsg.h> +#undef _SYS_TRACE_DBGMSG_INDIRECT + +#endif /* HAVE_DECLARE_EVENT_CLASS */ +#endif /* _KERNEL */ |