[32/73] tools lib traceevent: Man pages for registering print function
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Message ID 20190517193611.4974-33-acme@kernel.org
State Accepted
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  • Untitled series #119075
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Commit Message

Arnaldo Carvalho de Melo May 17, 2019, 7:35 p.m. UTC
From: Tzvetomir Stoyanov <tstoyanov@vmware.com>

Create man pages for libtraceevent APIs:


Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lkml.kernel.org/r/20190510200107.857252818@goodmis.org
Link: http://lore.kernel.org/linux-trace-devel/20190503091119.23399-13-tstoyanov@vmware.com
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 .../libtraceevent-reg_print_func.txt          | 155 ++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 tools/lib/traceevent/Documentation/libtraceevent-reg_print_func.txt

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diff --git a/tools/lib/traceevent/Documentation/libtraceevent-reg_print_func.txt b/tools/lib/traceevent/Documentation/libtraceevent-reg_print_func.txt
new file mode 100644
index 000000000000..708dce91ebd8
--- /dev/null
+++ b/tools/lib/traceevent/Documentation/libtraceevent-reg_print_func.txt
@@ -0,0 +1,155 @@ 
+tep_register_print_function,tep_unregister_print_function -
+Registers / Unregisters a helper function.
+*#include <event-parse.h>*
+enum *tep_func_arg_type* {
+typedef unsigned long long (*pass:[*]tep_func_handler*)(struct trace_seq pass:[*]s, unsigned long long pass:[*]args);
+int *tep_register_print_function*(struct tep_handle pass:[*]_tep_, tep_func_handler _func_, enum tep_func_arg_type _ret_type_, char pass:[*]_name_, _..._);
+int *tep_unregister_print_function*(struct tep_handle pass:[*]_tep_, tep_func_handler _func_, char pass:[*]_name_);
+Some events may have helper functions in the print format arguments.
+This allows a plugin to dynamically create a way to process one of
+these functions.
+The _tep_register_print_function()_ registers such helper function. The _tep_
+argument is the trace event parser context. The _func_ argument  is a pointer
+to the helper function. The _ret_type_ argument is  the return type of the
+helper function, value from the _tep_func_arg_type_ enum. The _name_ is the name
+of the helper function, as seen in the print format arguments. The _..._ is a
+variable list of _tep_func_arg_type_ enums, the _func_ function arguments.
+This list must end with _TEP_FUNC_ARG_VOID_. See 'EXAMPLE' section.
+The _tep_unregister_print_function()_ unregisters a helper function, previously
+registered with _tep_register_print_function()_. The _tep_ argument is the
+trace event parser context. The _func_ and _name_ arguments are the same, used
+when the helper function was registered.
+The _tep_func_handler_ is the type of the helper function. The _s_ argument is
+the trace sequence, it can be used to create a custom string.
+The _args_  is a list of arguments, defined when the helper function was
+The _tep_register_print_function()_ function returns 0 in case of success.
+In case of an error, TEP_ERRNO_... code is returned.
+The _tep_unregister_print_function()_ returns 0 in case of success, or -1 in
+case of an error.
+Some events have internal functions calls, that appear in the print format
+output. For example "tracefs/events/i915/g4x_wm/format" has:
+print fmt: "pipe %c, frame=%u, scanline=%u, wm %d/%d/%d, sr %s/%d/%d/%d, hpll %s/%d/%d/%d, fbc %s",
+	    ((REC->pipe) + 'A'), REC->frame, REC->scanline, REC->primary,
+	    REC->sprite, REC->cursor, yesno(REC->cxsr), REC->sr_plane,
+	    REC->sr_cursor, REC->sr_fbc, yesno(REC->hpll), REC->hpll_plane,
+	    REC->hpll_cursor, REC->hpll_fbc, yesno(REC->fbc)
+Notice the call to function _yesno()_ in the print arguments. In the kernel
+context, this function has the following implementation:
+static const char *yesno(int x)
+	static const char *yes = "yes";
+	static const char *no = "no";
+	return x ? yes : no;
+The user space event parser has no idea how to handle this _yesno()_ function.
+The _tep_register_print_function()_ API can be used to register a user space
+helper function, mapped to the kernel's _yesno()_:
+#include <event-parse.h>
+#include <trace-seq.h>
+struct tep_handle *tep = tep_alloc();
+static const char *yes_no_helper(int x)
+	return x ? "yes" : "no";
+	if ( tep_register_print_function(tep,
+				    yes_no_helper,
+				    "yesno",
+				    TEP_FUNC_ARG_INT,
+				    TEP_FUNC_ARG_VOID) != 0) {
+		/* Failed to register yes_no_helper function */
+	}
+   Now, when the event parser encounters this yesno() function, it will know
+   how to handle it.
+	if (tep_unregister_print_function(tep, yes_no_helper, "yesno") != 0) {
+		/* Failed to unregister yes_no_helper function */
+	}
+	Header file to include in order to have access to the library APIs.
+	Header file to include in order to have access to trace sequences
+	related APIs. Trace sequences are used to allow a function to call
+	several other functions to create a string of data to use.
+	Linker switch to add when building a program that uses the library.
+_libtraceevent(3)_, _trace-cmd(1)_
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+libtraceevent is Free Software licensed under the GNU LGPL 2.1