diff options
Diffstat (limited to 'sys/contrib/openzfs/include/os/linux/spl/sys/trace.h')
| -rw-r--r-- | sys/contrib/openzfs/include/os/linux/spl/sys/trace.h | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/include/os/linux/spl/sys/trace.h b/sys/contrib/openzfs/include/os/linux/spl/sys/trace.h new file mode 100644 index 000000000000..b148ace6abd3 --- /dev/null +++ b/sys/contrib/openzfs/include/os/linux/spl/sys/trace.h @@ -0,0 +1,175 @@ +/* + * 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 */ |