1 files changed, 108 insertions, 0 deletions
diff --git a/include/linux/ltt-channels.h b/include/linux/ltt-channels.h
new file mode 100644
index 000000000000..d8d368d5440b
--- /dev/null
+++ b/include/linux/ltt-channels.h
@@ -0,0 +1,108 @@
+#ifndef _LTT_CHANNELS_H
+#define _LTT_CHANNELS_H
+
+/*
+ * Copyright (C) 2008 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
+ *
+ * Dynamic tracer channel allocation.
+
+ * Dual LGPL v2.1/GPL v2 license.
+ */
+
+#include <linux/limits.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/timer.h>
+#include <linux/ltt-core.h>
+
+#define EVENTS_PER_CHANNEL	65536
+
+/*
+ * Forward declaration of locking-specific per-cpu buffer structure.
+ */
+struct ltt_chanbuf;
+struct ltt_trace;
+struct ltt_serialize_closure;
+struct ltt_probe_private_data;
+
+/* Serialization callback '%k' */
+typedef size_t (*ltt_serialize_cb)(struct ltt_chanbuf *buf, size_t buf_offset,
+				   struct ltt_serialize_closure *closure,
+				   void *serialize_private,
+				   unsigned int stack_pos_ctx,
+				   int *largest_align,
+				   const char *fmt, va_list *args);
+
+struct ltt_probe_private_data {
+	struct ltt_trace *trace;	/*
+					 * Target trace, for metadata
+					 * or statedump.
+					 */
+	ltt_serialize_cb serializer;	/*
+					 * Serialization function override.
+					 */
+	void *serialize_private;	/*
+					 * Private data for serialization
+					 * functions.
+					 */
+};
+
+struct ltt_chan_alloc {
+	unsigned long buf_size;		/* Size of the buffer */
+	unsigned long sb_size;		/* Sub-buffer size */
+	unsigned int sb_size_order;	/* Order of sub-buffer size */
+	unsigned int n_sb_order;	/* Number of sub-buffers per buffer */
+	int extra_reader_sb:1;		/* Bool: has extra reader subbuffer */
+	struct ltt_chanbuf *buf;	/* Channel per-cpu buffers */
+
+	struct kref kref;		/* Reference count */
+	unsigned long n_sb;		/* Number of sub-buffers */
+	struct dentry *parent;		/* Associated parent dentry */
+	struct dentry *ascii_dentry;	/* Text output dentry */
+	struct ltt_trace *trace;	/* Associated trace */
+	char filename[NAME_MAX];	/* Filename for channel files */
+};
+
+struct ltt_chan {
+	struct ltt_chan_alloc a;		/* Parent. First field. */
+	int overwrite:1;
+	int active:1;
+	unsigned long commit_count_mask;	/*
+						 * Commit count mask, removing
+						 * the MSBs corresponding to
+						 * bits used to represent the
+						 * subbuffer index.
+						 */
+	unsigned long switch_timer_interval;
+};
+
+struct ltt_channel_setting {
+	unsigned int sb_size;
+	unsigned int n_sb;
+	struct kref kref;	/* Number of references to structure content */
+	struct list_head list;
+	unsigned int index;	/* index of channel in trace channel array */
+	u16 free_event_id;	/* Next event ID to allocate */
+	char name[PATH_MAX];
+};
+
+int ltt_channels_register(const char *name);
+int ltt_channels_unregister(const char *name, int compacting);
+int ltt_channels_set_default(const char *name,
+			     unsigned int subbuf_size,
+			     unsigned int subbuf_cnt);
+const char *ltt_channels_get_name_from_index(unsigned int index);
+int ltt_channels_get_index_from_name(const char *name);
+int ltt_channels_trace_ref(void);
+struct ltt_chan *ltt_channels_trace_alloc(unsigned int *nr_channels,
+					  int overwrite, int active);
+void ltt_channels_trace_free(struct ltt_chan *channels,
+			     unsigned int nr_channels);
+void ltt_channels_trace_set_timer(struct ltt_chan *chan,
+				  unsigned long interval);
+
+int _ltt_channels_get_event_id(const char *channel, const char *name);
+int ltt_channels_get_event_id(const char *channel, const char *name);
+void _ltt_channels_reset_event_ids(void);
+
+#endif /* _LTT_CHANNELS_H */