tracing: support generic tracing hooks

Define generic interface and hooks for tracing to replace
kernel_event_logger and existing tracing facilities with something more
common.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

include/tracing.h

@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2018 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef _KERNEL_TRACE_H
+#define _KERNEL_TRACE_H
+
+#include <kernel.h>
+
+/* Below IDs are used with systemview, not final to the zephyr tracing API */
+#define SYS_TRACE_ID_OFFSET                  (32u)
+
+#define SYS_TRACE_ID_MUTEX_INIT              (1u + SYS_TRACE_ID_OFFSET)
+#define SYS_TRACE_ID_MUTEX_UNLOCK            (2u + SYS_TRACE_ID_OFFSET)
+#define SYS_TRACE_ID_MUTEX_LOCK              (3u + SYS_TRACE_ID_OFFSET)
+#define SYS_TRACE_ID_SEMA_INIT               (4u + SYS_TRACE_ID_OFFSET)
+#define SYS_TRACE_ID_SEMA_GIVE               (5u + SYS_TRACE_ID_OFFSET)
+#define SYS_TRACE_ID_SEMA_TAKE               (6u + SYS_TRACE_ID_OFFSET)
+
+#if CONFIG_TRACING
+void z_sys_trace_idle(void);
+void z_sys_trace_isr_enter(void);
+void z_sys_trace_isr_exit_to_scheduler(void);
+void z_sys_trace_thread_switched_in(void);
+#endif
+
+/**
+ * @brief Called before a thread has been selected to run
+ */
+#define sys_trace_thread_switched_out()
+
+/**
+ * @brief Called after a thread has been selected to run
+ */
+#define sys_trace_thread_switched_in()
+
+/**
+ * @brief Called when setting priority of a thread
+ */
+#define sys_trace_thread_priority_set(thread)
+
+/**
+ * @brief Called when a thread is being created
+ */
+#define sys_trace_thread_create(thread)
+
+/**
+ * @brief Called when a thread is being aborted
+ *
+ */
+#define sys_trace_thread_abort(thread)
+
+/**
+ * @brief Called when a thread is being suspended
+ * @param thread Thread structure
+ */
+#define sys_trace_thread_suspend(thread)
+
+/**
+ * @brief Called when a thread is being resumed from suspension
+ * @param thread Thread structure
+ */
+#define sys_trace_thread_resume(thread)
+
+/**
+ * @brief Called when a thread is ready to run
+ * @param thread Thread structure
+ */
+#define sys_trace_thread_ready(thread)
+
+/**
+ * @brief Called when a thread is pending
+ * @param thread Thread structure
+ */
+#define sys_trace_thread_pend(thread)
+
+/**
+ * @brief Provide information about specific thread
+ * @param thread Thread structure
+ */
+#define sys_trace_thread_info(thread)
+
+/**
+ * @brief Called when entering an ISR
+ */
+#define sys_trace_isr_enter()
+
+/**
+ * @brief Called when exiting an ISR
+ */
+#define sys_trace_isr_exit()
+
+/**
+ * @brief Called when exiting an ISR and switching to scheduler
+ */
+#define sys_trace_isr_exit_to_scheduler()
+
+/**
+ * @brief Can be called with any id signifying a new call
+ * @param id ID of the operation that was started
+ */
+#define sys_trace_void(id)
+
+/**
+ * @brief Can be called with any id signifying ending a call
+ * @param id ID of the operation that was completed
+ */
+#define sys_trace_end_call(id)
+
+
+
+#define z_sys_trace_idle()
+
+#define z_sys_trace_isr_enter()
+
+#define z_sys_trace_isr_exit_to_scheduler()
+
+#define z_sys_trace_thread_switched_in()
+
+#endif