FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/linux/spl/sys/trace.h

     /*
      * 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 https://opensource.org/licenses/CDDL-1.0.
     * 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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