1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h
new file mode 100644
index 000000000000..09abb80e0570
--- /dev/null
+++ b/drivers/oprofile/cpu_buffer.h
@@ -0,0 +1,57 @@
+/**
+ * @file cpu_buffer.h
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author John Levon <levon@movementarian.org>
+ */
+
+#ifndef OPROFILE_CPU_BUFFER_H
+#define OPROFILE_CPU_BUFFER_H
+
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/cache.h>
+ 
+struct task_struct;
+ 
+int alloc_cpu_buffers(void);
+void free_cpu_buffers(void);
+
+void start_cpu_work(void);
+void end_cpu_work(void);
+
+/* CPU buffer is composed of such entries (which are
+ * also used for context switch notes)
+ */
+struct op_sample {
+        unsigned long eip;
+        unsigned long event;
+};
+ 
+struct oprofile_cpu_buffer {
+        volatile unsigned long head_pos;
+        volatile unsigned long tail_pos;
+        unsigned long buffer_size;
+        struct task_struct * last_task;
+        int last_is_kernel;
+        int tracing;
+        struct op_sample * buffer;
+        unsigned long sample_received;
+        unsigned long sample_lost_overflow;
+        unsigned long backtrace_aborted;
+        int cpu;
+        struct work_struct work;
+} ____cacheline_aligned;
+
+extern struct oprofile_cpu_buffer cpu_buffer[];
+
+void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf);
+
+/* transient events for the CPU buffer -> event buffer */
+#define CPU_IS_KERNEL 1
+#define CPU_TRACE_BEGIN 2
+
+#endif /* OPROFILE_CPU_BUFFER_H */