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rtla/trace: Add trace events helpers

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Add a set of helper functions to allow the rtla tools to enable
additional tracepoints in the trace instance.

Link: https://lkml.kernel.org/r/932398b36c1bbaa22c7810d7a40ca9b8c5595b94.1646247211.git.bristot@kernel.org

Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Clark Williams <williams@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira 2022-03-02 20:01:30 +01:00 committed by Steven Rostedt (Google)
parent 173a3b0148
commit b5aa0be25c
2 changed files with 119 additions and 0 deletions
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104
tools/tracing/rtla/src/trace.c
View file

@ -190,3 +190,107 @@ int trace_instance_start(struct trace_instance *trace)
{
return tracefs_trace_on(trace->inst);
}
/*
* trace_events_free - free a list of trace events
*/
static void trace_events_free(struct trace_events *events)
{
struct trace_events *tevent = events;
struct trace_events *free_event;
while (tevent) {
free_event = tevent;
tevent = tevent->next;
free(free_event->system);
free(free_event);
}
}
/*
* trace_event_alloc - alloc and parse a single trace event
*/
struct trace_events *trace_event_alloc(const char *event_string)
{
struct trace_events *tevent;
tevent = calloc(1, sizeof(*tevent));
if (!tevent)
return NULL;
tevent->system = strdup(event_string);
if (!tevent->system) {
free(tevent);
return NULL;
}
tevent->event = strstr(tevent->system, ":");
if (tevent->event) {
*tevent->event = '\0';
tevent->event = &tevent->event[1];
}
return tevent;
}
/*
* trace_events_disable - disable all trace events
*/
void trace_events_disable(struct trace_instance *instance,
struct trace_events *events)
{
struct trace_events *tevent = events;
if (!events)
return;
while (tevent) {
debug_msg("Disabling event %s:%s\n", tevent->system, tevent->event ? : "*");
if (tevent->enabled)
tracefs_event_disable(instance->inst, tevent->system, tevent->event);
tevent->enabled = 0;
tevent = tevent->next;
}
}
/*
* trace_events_enable - enable all events
*/
int trace_events_enable(struct trace_instance *instance,
struct trace_events *events)
{
struct trace_events *tevent = events;
int retval;
while (tevent) {
debug_msg("Enabling event %s:%s\n", tevent->system, tevent->event ? : "*");
retval = tracefs_event_enable(instance->inst, tevent->system, tevent->event);
if (retval < 0) {
err_msg("Error enabling event %s:%s\n", tevent->system,
tevent->event ? : "*");
return 1;
}
tevent->enabled = 1;
tevent = tevent->next;
}
return 0;
}
/*
* trace_events_destroy - disable and free all trace events
*/
void trace_events_destroy(struct trace_instance *instance,
struct trace_events *events)
{
if (!events)
return;
trace_events_disable(instance, events);
trace_events_free(events);
}

15
tools/tracing/rtla/src/trace.h
View file

@ -2,6 +2,13 @@
#include <tracefs.h>
#include <stddef.h>
struct trace_events {
struct trace_events *next;
char *system;
char *event;
char enabled;
};
struct trace_instance {
struct tracefs_instance *inst;
struct tep_handle *tep;
@ -25,3 +32,11 @@ void destroy_instance(struct tracefs_instance *inst);
int save_trace_to_file(struct tracefs_instance *inst, const char *filename);
int collect_registered_events(struct tep_event *tep, struct tep_record *record,
int cpu, void *context);
struct trace_events *trace_event_alloc(const char *event_string);
void trace_events_disable(struct trace_instance *instance,
struct trace_events *events);
void trace_events_destroy(struct trace_instance *instance,
struct trace_events *events);
int trace_events_enable(struct trace_instance *instance,
struct trace_events *events);