cb70964221
ZFS tracing efforts are hampered by the inability to access zfs static probes(probes using DTRACE_PROBE macros). The probes are available via tracepoints for GPL modules only. The build could be modified to generate a function for each unique DTRACE_PROBE invocation. These could be then accessed via kprobes. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Matt Ahrens <matt@delphix.com> Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com> Signed-off-by: Brad Lewis <brad.lewis@delphix.com> Closes #8659 Closes #8663
188 lines
6.1 KiB
C
188 lines
6.1 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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#if defined(_KERNEL)
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/*
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* Calls to DTRACE_PROBE* are mapped to standard Linux kernel trace points
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* when they are available(when HAVE_DECLARE_EVENT_CLASS is defined). The
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* tracepoint event class definitions are found in the general tracing
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* header file: include/sys/trace_*.h. See include/sys/trace_vdev.h for
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* a good example.
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*
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* If tracepoints are not available, stub functions are generated which can
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* be traced using kprobes. In this case, the DEFINE_DTRACE_PROBE* macros
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* are used to provide the stub functions and also the prototypes for
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* those functions. The mechanism to do this relies on DEFINE_DTRACE_PROBE
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* macros defined in the general tracing headers(see trace_vdev.h) and
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* CREATE_TRACE_POINTS being defined only in module/zfs/trace.c. When ZFS
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* source files include the general tracing headers, e.g.
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* module/zfs/vdev_removal.c including trace_vdev.h, DTRACE_PROBE calls
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* are mapped to stub functions calls and prototypes for those calls are
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* declared via DEFINE_DTRACE_PROBE*. Only module/zfs/trace.c defines
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* CREATE_TRACE_POINTS. That is follwed by includes of all the general
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* tracing headers thereby defining all stub functions in one place via
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* the DEFINE_DTRACE_PROBE macros.
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*
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* When adding new DTRACE_PROBEs to zfs source, both a tracepoint event
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* class defintition and a DEFINE_DTRACE_PROBE definition are needed to
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* avoid undefined function errors.
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*/
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#if defined(HAVE_DECLARE_EVENT_CLASS)
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM zfs
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#if !defined(_TRACE_ZFS_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_ZFS_H
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#include <linux/tracepoint.h>
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#include <sys/types.h>
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/*
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* The sys/trace_dbgmsg.h header defines tracepoint events for
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* dprintf(), dbgmsg(), and SET_ERROR().
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*/
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#define _SYS_TRACE_DBGMSG_INDIRECT
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#include <sys/trace_dbgmsg.h>
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#undef _SYS_TRACE_DBGMSG_INDIRECT
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/*
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* DTRACE_PROBE with 0 arguments is not currently available with
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* tracepoint events
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*/
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#define DTRACE_PROBE(name) \
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((void)0)
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#define DTRACE_PROBE1(name, t1, arg1) \
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trace_zfs_##name((arg1))
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#define DTRACE_PROBE2(name, t1, arg1, t2, arg2) \
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trace_zfs_##name((arg1), (arg2))
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#define DTRACE_PROBE3(name, t1, arg1, t2, arg2, t3, arg3) \
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trace_zfs_##name((arg1), (arg2), (arg3))
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#define DTRACE_PROBE4(name, t1, arg1, t2, arg2, t3, arg3, t4, arg4) \
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trace_zfs_##name((arg1), (arg2), (arg3), (arg4))
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#endif /* _TRACE_ZFS_H */
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#undef TRACE_INCLUDE_PATH
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#undef TRACE_INCLUDE_FILE
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#define TRACE_INCLUDE_PATH sys
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#define TRACE_INCLUDE_FILE trace
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#include <trace/define_trace.h>
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#else /* HAVE_DECLARE_EVENT_CLASS */
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#define DTRACE_PROBE(name) \
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trace_zfs_##name()
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#define DTRACE_PROBE1(name, t1, arg1) \
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trace_zfs_##name((uintptr_t)(arg1))
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#define DTRACE_PROBE2(name, t1, arg1, t2, arg2) \
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trace_zfs_##name((uintptr_t)(arg1), (uintptr_t)(arg2))
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#define DTRACE_PROBE3(name, t1, arg1, t2, arg2, t3, arg3) \
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trace_zfs_##name((uintptr_t)(arg1), (uintptr_t)(arg2), \
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(uintptr_t)(arg3))
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#define DTRACE_PROBE4(name, t1, arg1, t2, arg2, t3, arg3, t4, arg4) \
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trace_zfs_##name((uintptr_t)(arg1), (uintptr_t)(arg2), \
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(uintptr_t)(arg3), (uintptr_t)(arg4))
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#if defined(CREATE_TRACE_POINTS)
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#define FUNC_DTRACE_PROBE(name) \
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noinline void trace_zfs_##name(void) { } \
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EXPORT_SYMBOL(trace_zfs_##name)
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#define FUNC_DTRACE_PROBE1(name) \
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noinline void trace_zfs_##name(uintptr_t arg1) { } \
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EXPORT_SYMBOL(trace_zfs_##name)
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#define FUNC_DTRACE_PROBE2(name) \
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noinline void trace_zfs_##name(uintptr_t arg1, \
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uintptr_t arg2) { } \
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EXPORT_SYMBOL(trace_zfs_##name)
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#define FUNC_DTRACE_PROBE3(name) \
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noinline void trace_zfs_##name(uintptr_t arg1, \
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uintptr_t arg2, uintptr_t arg3) { } \
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EXPORT_SYMBOL(trace_zfs_##name)
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#define FUNC_DTRACE_PROBE4(name) \
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noinline void trace_zfs_##name(uintptr_t arg1, \
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uintptr_t arg2, uintptr_t arg3, uintptr_t arg4) { } \
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EXPORT_SYMBOL(trace_zfs_##name)
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#undef DEFINE_DTRACE_PROBE
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#define DEFINE_DTRACE_PROBE(name) FUNC_DTRACE_PROBE(name)
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#undef DEFINE_DTRACE_PROBE1
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#define DEFINE_DTRACE_PROBE1(name) FUNC_DTRACE_PROBE1(name)
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#undef DEFINE_DTRACE_PROBE2
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#define DEFINE_DTRACE_PROBE2(name) FUNC_DTRACE_PROBE2(name)
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#undef DEFINE_DTRACE_PROBE3
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#define DEFINE_DTRACE_PROBE3(name) FUNC_DTRACE_PROBE3(name)
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#undef DEFINE_DTRACE_PROBE4
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#define DEFINE_DTRACE_PROBE4(name) FUNC_DTRACE_PROBE4(name)
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#else /* CREATE_TRACE_POINTS */
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#define PROTO_DTRACE_PROBE(name) \
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noinline void trace_zfs_##name(void)
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#define PROTO_DTRACE_PROBE1(name) \
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noinline void trace_zfs_##name(uintptr_t)
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#define PROTO_DTRACE_PROBE2(name) \
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noinline void trace_zfs_##name(uintptr_t, uintptr_t)
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#define PROTO_DTRACE_PROBE3(name) \
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noinline void trace_zfs_##name(uintptr_t, uintptr_t, \
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uintptr_t)
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#define PROTO_DTRACE_PROBE4(name) \
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noinline void trace_zfs_##name(uintptr_t, uintptr_t, \
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uintptr_t, uintptr_t)
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#define DEFINE_DTRACE_PROBE(name) PROTO_DTRACE_PROBE(name)
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#define DEFINE_DTRACE_PROBE1(name) PROTO_DTRACE_PROBE1(name)
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#define DEFINE_DTRACE_PROBE2(name) PROTO_DTRACE_PROBE2(name)
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#define DEFINE_DTRACE_PROBE3(name) PROTO_DTRACE_PROBE3(name)
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#define DEFINE_DTRACE_PROBE4(name) PROTO_DTRACE_PROBE4(name)
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#endif /* CREATE_TRACE_POINTS */
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/*
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* The sys/trace_dbgmsg.h header defines tracepoint events for
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* dprintf(), dbgmsg(), and SET_ERROR().
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*/
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#define _SYS_TRACE_DBGMSG_INDIRECT
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#include <sys/trace_dbgmsg.h>
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#undef _SYS_TRACE_DBGMSG_INDIRECT
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#endif /* HAVE_DECLARE_EVENT_CLASS */
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#endif /* _KERNEL */
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