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Message-ID: <20200702185704.248123446@goodmis.org>
Date: Thu, 02 Jul 2020 14:53:49 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org, linux-trace-devel@...r.kernel.org
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
"Tzvetomir Stoyanov (VMware)" <tz.stoyanov@...il.com>
Subject: [PATCH v2 05/15] tools lib traceevent: Introduced new traceevent API, for adding new
plugins directories.
From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@...il.com>
Implement new traceevent plugin API, which can be used to add new plugins
directories:
enum tep_plugin_load_priority {
TEP_PLUGIN_FIRST,
TEP_PLUGIN_LAST,
};
int tep_add_plugin_path(struct tep_handle *tep, char *path,
enum tep_plugin_load_priority prio);
It adds the "path" as new plugin directory, in the context of
the handler "tep". The tep_load_plugins() API searches for plugins
in this new location. Depending of the priority "prio", the plugins
from this directory are loaded before (TEP_PLUGIN_FIRST) or after
(TEP_PLUGIN_LAST) the ordinary libtraceevent plugin locations.
Link: http://lore.kernel.org/linux-trace-devel/20191007114947.17104-2-tz.stoyanov@gmail.com
Link: http://lore.kernel.org/linux-trace-devel/20200625100516.365338-6-tz.stoyanov@gmail.com
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@...il.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
tools/lib/traceevent/event-parse-local.h | 5 +-
tools/lib/traceevent/event-parse.c | 1 +
tools/lib/traceevent/event-parse.h | 7 +++
tools/lib/traceevent/event-plugin.c | 70 ++++++++++++++++++++++++
4 files changed, 82 insertions(+), 1 deletion(-)
diff --git a/tools/lib/traceevent/event-parse-local.h b/tools/lib/traceevent/event-parse-local.h
index cee469803a34..96a0b0ca0675 100644
--- a/tools/lib/traceevent/event-parse-local.h
+++ b/tools/lib/traceevent/event-parse-local.h
@@ -13,6 +13,7 @@ struct func_map;
struct func_list;
struct event_handler;
struct func_resolver;
+struct tep_plugins_dir;
struct tep_handle {
int ref_count;
@@ -47,7 +48,6 @@ struct tep_handle {
struct printk_list *printklist;
unsigned int printk_count;
-
struct tep_event **events;
int nr_events;
struct tep_event **sort_events;
@@ -81,10 +81,13 @@ struct tep_handle {
/* cache */
struct tep_event *last_event;
+
+ struct tep_plugins_dir *plugins_dir;
};
void tep_free_event(struct tep_event *event);
void tep_free_format_field(struct tep_format_field *field);
+void tep_free_plugin_paths(struct tep_handle *tep);
unsigned short tep_data2host2(struct tep_handle *tep, unsigned short data);
unsigned int tep_data2host4(struct tep_handle *tep, unsigned int data);
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index e1bd2a93c6db..064c100d2d5a 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -7065,6 +7065,7 @@ void tep_free(struct tep_handle *tep)
free(tep->events);
free(tep->sort_events);
free(tep->func_resolver);
+ tep_free_plugin_paths(tep);
free(tep);
}
diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index 02c0438527de..91f462f5a606 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -393,6 +393,13 @@ struct tep_plugin_list;
#define INVALID_PLUGIN_LIST_OPTION ((char **)((unsigned long)-1))
+enum tep_plugin_load_priority {
+ TEP_PLUGIN_FIRST,
+ TEP_PLUGIN_LAST,
+};
+
+int tep_add_plugin_path(struct tep_handle *tep, char *path,
+ enum tep_plugin_load_priority prio);
struct tep_plugin_list *tep_load_plugins(struct tep_handle *tep);
void tep_unload_plugins(struct tep_plugin_list *plugin_list,
struct tep_handle *tep);
diff --git a/tools/lib/traceevent/event-plugin.c b/tools/lib/traceevent/event-plugin.c
index e8f4329ba8e0..1d4f1809cf17 100644
--- a/tools/lib/traceevent/event-plugin.c
+++ b/tools/lib/traceevent/event-plugin.c
@@ -39,6 +39,12 @@ struct tep_plugin_list {
void *handle;
};
+struct tep_plugins_dir {
+ struct tep_plugins_dir *next;
+ char *path;
+ enum tep_plugin_load_priority prio;
+};
+
static void lower_case(char *str)
{
if (!str)
@@ -544,6 +550,7 @@ void tep_load_plugins_hook(struct tep_handle *tep, const char *suffix,
void *data),
void *data)
{
+ struct tep_plugins_dir *dir = NULL;
char *home;
char *path;
char *envdir;
@@ -552,6 +559,15 @@ void tep_load_plugins_hook(struct tep_handle *tep, const char *suffix,
if (tep && tep->flags & TEP_DISABLE_PLUGINS)
return;
+ if (tep)
+ dir = tep->plugins_dir;
+ while (dir) {
+ if (dir->prio == TEP_PLUGIN_FIRST)
+ load_plugins_dir(tep, suffix, dir->path,
+ load_plugin, data);
+ dir = dir->next;
+ }
+
/*
* If a system plugin directory was defined,
* check that first.
@@ -586,6 +602,15 @@ void tep_load_plugins_hook(struct tep_handle *tep, const char *suffix,
load_plugins_dir(tep, suffix, path, load_plugin, data);
+ if (tep)
+ dir = tep->plugins_dir;
+ while (dir) {
+ if (dir->prio == TEP_PLUGIN_LAST)
+ load_plugins_dir(tep, suffix, dir->path,
+ load_plugin, data);
+ dir = dir->next;
+ }
+
free(path);
}
@@ -598,6 +623,51 @@ tep_load_plugins(struct tep_handle *tep)
return list;
}
+/**
+ * tep_add_plugin_path - Add a new plugin directory.
+ * @tep: Trace event handler.
+ * @path: Path to a directory. All files with extension .so in that
+ * directory will be loaded as plugins.
+ *@...o: Load priority of the plugins in that directory.
+ *
+ * Returns -1 in case of an error, 0 otherwise.
+ */
+int tep_add_plugin_path(struct tep_handle *tep, char *path,
+ enum tep_plugin_load_priority prio)
+{
+ struct tep_plugins_dir *dir;
+
+ if (!tep || !path)
+ return -1;
+
+ dir = calloc(1, sizeof(*dir));
+ if (!dir)
+ return -1;
+
+ dir->path = strdup(path);
+ dir->prio = prio;
+ dir->next = tep->plugins_dir;
+ tep->plugins_dir = dir;
+
+ return 0;
+}
+
+void tep_free_plugin_paths(struct tep_handle *tep)
+{
+ struct tep_plugins_dir *dir;
+
+ if (!tep)
+ return;
+
+ dir = tep->plugins_dir;
+ while (dir) {
+ tep->plugins_dir = tep->plugins_dir->next;
+ free(dir->path);
+ free(dir);
+ dir = tep->plugins_dir;
+ }
+}
+
void
tep_unload_plugins(struct tep_plugin_list *plugin_list, struct tep_handle *tep)
{
--
2.26.2
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