X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=ltt-probes.c;h=81dcbd715df08300b6bcfd9973418f853544e8d0;hb=9d7d747f10bab16b3d85915a5b87e10acd2374f0;hp=dbdb50d402a2f7bbecd06a203d03fe46a3b85300;hpb=85a9ca7ff30ef892e5865c5541fd11f6c6de33a3;p=lttng-modules.git

diff --git a/ltt-probes.c b/ltt-probes.c
index dbdb50d4..81dcbd71 100644
--- a/ltt-probes.c
+++ b/ltt-probes.c
@@ -4,11 +4,14 @@
  * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
  * Holds LTTng probes registry.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
  */
 
 #include <linux/module.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
+#include <linux/seq_file.h>
 
 #include "ltt-events.h"
 
@@ -23,18 +26,13 @@ const struct lttng_event_desc *find_event(const char *name)
 
 	list_for_each_entry(probe_desc, &probe_list, head) {
 		for (i = 0; i < probe_desc->nr_events; i++) {
-			if (!strcmp(probe_desc->event_desc[i].name, name))
-				return &probe_desc->event_desc[i];
+			if (!strcmp(probe_desc->event_desc[i]->name, name))
+				return probe_desc->event_desc[i];
 		}
 	}
 	return NULL;
 }
 
-/*
- * TODO: registration of probe descriptions in dynamically allocated memory (not
- * directly in a module memory) will require some care for refcounting: it's
- * currently done by just refcounting the module in event_get/put.
- */
 int ltt_probe_register(struct lttng_probe_desc *desc)
 {
 	int ret = 0;
@@ -46,7 +44,7 @@ int ltt_probe_register(struct lttng_probe_desc *desc)
 	 * overhead becomes an issue.
 	 */
 	for (i = 0; i < desc->nr_events; i++) {
-		if (find_event(desc->event_desc[i].name)) {
+		if (find_event(desc->event_desc[i]->name)) {
 			ret = -EEXIST;
 			goto end;
 		}
@@ -73,18 +71,94 @@ const struct lttng_event_desc *ltt_event_get(const char *name)
 
 	mutex_lock(&probe_mutex);
 	event = find_event(name);
+	mutex_unlock(&probe_mutex);
 	if (!event)
-		goto end;
-	ret = try_module_get(__module_text_address((unsigned long) event));
+		return NULL;
+	ret = try_module_get(event->owner);
 	WARN_ON_ONCE(!ret);
-end:
-	mutex_unlock(&probe_mutex);
 	return event;
 }
 EXPORT_SYMBOL_GPL(ltt_event_get);
 
 void ltt_event_put(const struct lttng_event_desc *event)
 {
-	module_put(__module_text_address((unsigned long) event));
+	module_put(event->owner);
 }
 EXPORT_SYMBOL_GPL(ltt_event_put);
+
+static
+void *tp_list_start(struct seq_file *m, loff_t *pos)
+{
+	struct lttng_probe_desc *probe_desc;
+	int iter = 0, i;
+
+	mutex_lock(&probe_mutex);
+	list_for_each_entry(probe_desc, &probe_list, head) {
+		for (i = 0; i < probe_desc->nr_events; i++) {
+			if (iter++ >= *pos)
+				return (void *) probe_desc->event_desc[i];
+		}
+	}
+	/* End of list */
+	return NULL;
+}
+
+static
+void *tp_list_next(struct seq_file *m, void *p, loff_t *ppos)
+{
+	struct lttng_probe_desc *probe_desc;
+	int iter = 0, i;
+
+	(*ppos)++;
+	list_for_each_entry(probe_desc, &probe_list, head) {
+		for (i = 0; i < probe_desc->nr_events; i++) {
+			if (iter++ >= *ppos)
+				return (void *) probe_desc->event_desc[i];
+		}
+	}
+	/* End of list */
+	return NULL;
+}
+
+static
+void tp_list_stop(struct seq_file *m, void *p)
+{
+	mutex_unlock(&probe_mutex);
+}
+
+static
+int tp_list_show(struct seq_file *m, void *p)
+{
+	const struct lttng_event_desc *probe_desc = p;
+
+	/*
+	 * Don't export lttng internal events (metadata).
+	 */
+	if (!strncmp(probe_desc->name, "lttng_", sizeof("lttng_") - 1))
+		return 0;
+	seq_printf(m,	"event { name = %s; };\n",
+		   probe_desc->name);
+	return 0;
+}
+
+static
+const struct seq_operations lttng_tracepoint_list_seq_ops = {
+	.start = tp_list_start,
+	.next = tp_list_next,
+	.stop = tp_list_stop,
+	.show = tp_list_show,
+};
+
+static
+int lttng_tracepoint_list_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &lttng_tracepoint_list_seq_ops);
+}
+
+const struct file_operations lttng_tracepoint_list_fops = {
+	.owner = THIS_MODULE,
+	.open = lttng_tracepoint_list_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = seq_release,
+};