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tracing: Add kprobe event command generation functions

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Add functions used to generate kprobe event commands, built on top of
the dynevent_cmd interface.

kprobe_event_gen_cmd_start() is used to create a kprobe event command
using a variable arg list, and kretprobe_event_gen_cmd_start() does
the same for kretprobe event commands.  kprobe_event_add_fields() can
be used to add single fields one by one or as a group.  Once all
desired fields are added, kprobe_event_gen_cmd_end() or
kretprobe_event_gen_cmd_end() respectively are used to actually
execute the command and create the event.

Link: http://lkml.kernel.org/r/95cc4696502bb6017f9126f306a45ad19b4cc14f.1580323897.git.zanussi@kernel.org

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi
2020-01-29 12:59:29 -06:00
committed by Steven Rostedt (VMware)
parent 9fe41efaca
commit 2a588dd1d5
2 changed files with 192 additions and 0 deletions
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31
include/linux/trace_events.h
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@@ -358,6 +358,7 @@ extern void trace_put_event_file(struct trace_event_file *file);
enum dynevent_type {
DYNEVENT_TYPE_SYNTH = 1,
DYNEVENT_TYPE_KPROBE,
DYNEVENT_TYPE_NONE,
};
@@ -442,6 +443,36 @@ extern int synth_event_add_val(const char *field_name, u64 val,
struct synth_event_trace_state *trace_state);
extern int synth_event_trace_end(struct synth_event_trace_state *trace_state);
extern int kprobe_event_delete(const char *name);
extern void kprobe_event_cmd_init(struct dynevent_cmd *cmd,
char *buf, int maxlen);
#define kprobe_event_gen_cmd_start(cmd, name, loc, ...) \
__kprobe_event_gen_cmd_start(cmd, false, name, loc, ## __VA_ARGS__, NULL)
#define kretprobe_event_gen_cmd_start(cmd, name, loc, ...) \
__kprobe_event_gen_cmd_start(cmd, true, name, loc, ## __VA_ARGS__, NULL)
extern int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd,
bool kretprobe,
const char *name,
const char *loc, ...);
#define kprobe_event_add_fields(cmd, ...) \
__kprobe_event_add_fields(cmd, ## __VA_ARGS__, NULL)
#define kprobe_event_add_field(cmd, field) \
__kprobe_event_add_fields(cmd, field, NULL)
extern int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...);
#define kprobe_event_gen_cmd_end(cmd) \
dynevent_create(cmd)
#define kretprobe_event_gen_cmd_end(cmd) \
dynevent_create(cmd)
/*
* Event file flags:
* ENABLED - The event is enabled