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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
#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 followed 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 definition 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
#if !defined(_TRACE_ZFS_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_ZFS_H
#include <linux/tracepoint.h>
#include <sys/types.h>
/*
* DTRACE_PROBE with 0 arguments is not currently available with
* tracepoint events
*/
#define DTRACE_PROBE(name) \
((void)0)
#define DTRACE_PROBE1(name, t1, arg1) \
trace_zfs_##name((arg1))
#define DTRACE_PROBE2(name, t1, arg1, t2, arg2) \
trace_zfs_##name((arg1), (arg2))
#define DTRACE_PROBE3(name, t1, arg1, t2, arg2, t3, arg3) \
trace_zfs_##name((arg1), (arg2), (arg3))
#define DTRACE_PROBE4(name, t1, arg1, t2, arg2, t3, arg3, t4, arg4) \
trace_zfs_##name((arg1), (arg2), (arg3), (arg4))
#endif /* _TRACE_ZFS_H */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH sys
#define TRACE_INCLUDE_FILE trace
#include <trace/define_trace.h>
#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))
#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)
#if defined(CREATE_TRACE_POINTS)
#define FUNC_DTRACE_PROBE(name) \
PROTO_DTRACE_PROBE(name); \
noinline void trace_zfs_##name(void) { } \
EXPORT_SYMBOL(trace_zfs_##name)
#define FUNC_DTRACE_PROBE1(name) \
PROTO_DTRACE_PROBE1(name); \
noinline void trace_zfs_##name(uintptr_t arg1) { } \
EXPORT_SYMBOL(trace_zfs_##name)
#define FUNC_DTRACE_PROBE2(name) \
PROTO_DTRACE_PROBE2(name); \
noinline void trace_zfs_##name(uintptr_t arg1, \
uintptr_t arg2) { } \
EXPORT_SYMBOL(trace_zfs_##name)
#define FUNC_DTRACE_PROBE3(name) \
PROTO_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) \
PROTO_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 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 */
#endif /* HAVE_DECLARE_EVENT_CLASS */
#endif /* _KERNEL */
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