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tools lib traceevent: Add pevent_unregister_event_handler()

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When a plugin is unloaded it needs to unregister its handler from pevent.

So add an unregister function to do it.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1389839478-5887-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2014-01-16 11:31:07 +09:00 committed by Arnaldo Carvalho de Melo
parent 3e7e09dbd1
commit ad13701d49
2 changed files with 102 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

113
tools/lib/traceevent/event-parse.c
View File

@ -5560,6 +5560,29 @@ int pevent_register_print_function(struct pevent *pevent,
return ret;
}
static struct event_format *pevent_search_event(struct pevent *pevent, int id,
const char *sys_name,
const char *event_name)
{
struct event_format *event;
if (id >= 0) {
/* search by id */
event = pevent_find_event(pevent, id);
if (!event)
return NULL;
if (event_name && (strcmp(event_name, event->name) != 0))
return NULL;
if (sys_name && (strcmp(sys_name, event->system) != 0))
return NULL;
} else {
event = pevent_find_event_by_name(pevent, sys_name, event_name);
if (!event)
return NULL;
}
return event;
}
/**
* pevent_register_event_handler - register a way to parse an event
* @pevent: the handle to the pevent
@ -5584,20 +5607,9 @@ int pevent_register_event_handler(struct pevent *pevent, int id,
struct event_format *event;
struct event_handler *handle;
if (id >= 0) {
/* search by id */
event = pevent_find_event(pevent, id);
if (!event)
goto not_found;
if (event_name && (strcmp(event_name, event->name) != 0))
goto not_found;
if (sys_name && (strcmp(sys_name, event->system) != 0))
goto not_found;
} else {
event = pevent_find_event_by_name(pevent, sys_name, event_name);
if (!event)
goto not_found;
}
event = pevent_search_event(pevent, id, sys_name, event_name);
if (event == NULL)
goto not_found;
pr_stat("overriding event (%d) %s:%s with new print handler",
event->id, event->system, event->name);
@ -5637,6 +5649,79 @@ int pevent_register_event_handler(struct pevent *pevent, int id,
return -1;
}
static int handle_matches(struct event_handler *handler, int id,
const char *sys_name, const char *event_name,
pevent_event_handler_func func, void *context)
{
if (id >= 0 && id != handler->id)
return 0;
if (event_name && (strcmp(event_name, handler->event_name) != 0))
return 0;
if (sys_name && (strcmp(sys_name, handler->sys_name) != 0))
return 0;
if (func != handler->func || context != handler->context)
return 0;
return 1;
}
/**
* pevent_unregister_event_handler - unregister an existing event handler
* @pevent: the handle to the pevent
* @id: the id of the event to unregister
* @sys_name: the system name the handler belongs to
* @event_name: the name of the event handler
* @func: the function to call to parse the event information
* @context: the data to be passed to @func
*
* This function removes existing event handler (parser).
*
* If @id is >= 0, then it is used to find the event.
* else @sys_name and @event_name are used.
*
* Returns 0 if handler was removed successfully, -1 if event was not found.
*/
int pevent_unregister_event_handler(struct pevent *pevent, int id,
const char *sys_name, const char *event_name,
pevent_event_handler_func func, void *context)
{
struct event_format *event;
struct event_handler *handle;
struct event_handler **next;
event = pevent_search_event(pevent, id, sys_name, event_name);
if (event == NULL)
goto not_found;
if (event->handler == func && event->context == context) {
pr_stat("removing override handler for event (%d) %s:%s. Going back to default handler.",
event->id, event->system, event->name);
event->handler = NULL;
event->context = NULL;
return 0;
}
not_found:
for (next = &pevent->handlers; *next; next = &(*next)->next) {
handle = *next;
if (handle_matches(handle, id, sys_name, event_name,
func, context))
break;
}
if (!(*next))
return -1;
*next = handle->next;
free_handler(handle);
return 0;
}
/**
* pevent_alloc - create a pevent handle
*/

3
tools/lib/traceevent/event-parse.h
View File

@ -624,6 +624,9 @@ int pevent_print_func_field(struct trace_seq *s, const char *fmt,
int pevent_register_event_handler(struct pevent *pevent, int id,
const char *sys_name, const char *event_name,
pevent_event_handler_func func, void *context);
int pevent_unregister_event_handler(struct pevent *pevent, int id,
const char *sys_name, const char *event_name,
pevent_event_handler_func func, void *context);
int pevent_register_print_function(struct pevent *pevent,
pevent_func_handler func,
enum pevent_func_arg_type ret_type,