/*-
 *   BSD LICENSE
 *
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 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
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 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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/**
 * \file
 * Tracepoint library
 */

#ifndef _SPDK_TRACE_H_
#define _SPDK_TRACE_H_

#include "spdk/stdinc.h"

#ifdef __cplusplus
extern "C" {
#endif

#define SPDK_TRACE_SIZE	 (32 * 1024)

struct spdk_trace_entry {
	uint64_t	tsc;
	uint16_t	tpoint_id;
	uint16_t	poller_id;
	uint32_t	size;
	uint64_t	object_id;
	uint64_t	arg1;
};

/* If type changes from a uint8_t, change this value. */
#define SPDK_TRACE_MAX_OWNER (UCHAR_MAX + 1)

struct spdk_trace_owner {
	uint8_t	type;
	char	id_prefix;
};

/* If type changes from a uint8_t, change this value. */
#define SPDK_TRACE_MAX_OBJECT (UCHAR_MAX + 1)

struct spdk_trace_object {
	uint8_t	type;
	char	id_prefix;
};

#define SPDK_TRACE_MAX_GROUP_ID  16
#define SPDK_TRACE_MAX_TPOINT_ID (SPDK_TRACE_MAX_GROUP_ID * 64)
#define SPDK_TPOINT_ID(group, tpoint)	((group * 64) + tpoint)

struct spdk_trace_tpoint {
	char		name[44];
	char		short_name[4];
	uint16_t	tpoint_id;
	uint8_t		owner_type;
	uint8_t		object_type;
	uint8_t		new_object;
	uint8_t		arg1_is_ptr;
	uint8_t		arg1_is_alias;
	char		arg1_name[8];
};

struct spdk_trace_history {
	/** Logical core number associated with this structure instance. */
	int				lcore;

	/**
	 * Circular buffer of spdk_trace_entry structures for tracing
	 *  tpoints on this core.  Debug tool spdk_trace reads this
	 *  buffer from shared memory to post-process the tpoint entries and
	 *  display in a human-readable format.
	 */
	struct spdk_trace_entry		entries[SPDK_TRACE_SIZE];

	/**
	 * Running count of number of occurrences of each tracepoint on this
	 *  lcore.  Debug tools can use this to easily count tracepoints such as
	 *  number of SCSI tasks completed or PDUs read.
	 */
	uint64_t			tpoint_count[SPDK_TRACE_MAX_TPOINT_ID];

	/** Index to next spdk_trace_entry to fill in the circular buffer. */
	uint32_t			next_entry;

};

#define SPDK_TRACE_MAX_LCORE		128

struct spdk_trace_flags {
	uint64_t			tsc_rate;
	uint64_t			tpoint_mask[SPDK_TRACE_MAX_GROUP_ID];
	struct spdk_trace_owner		owner[UCHAR_MAX + 1];
	struct spdk_trace_object	object[UCHAR_MAX + 1];
	struct spdk_trace_tpoint	tpoint[SPDK_TRACE_MAX_TPOINT_ID];
};
extern struct spdk_trace_flags *g_trace_flags;


struct spdk_trace_histories {
	struct spdk_trace_flags flags;
	struct spdk_trace_history	per_lcore_history[SPDK_TRACE_MAX_LCORE];
};

void spdk_trace_record(uint16_t tpoint_id, uint16_t poller_id, uint32_t size,
		       uint64_t object_id, uint64_t arg1);

/** Returns the current tpoint mask. */
uint64_t spdk_trace_get_tpoint_mask(uint32_t group_id);

/** Adds the specified tpoints to the current tpoint mask for the given tpoint group. */
void spdk_trace_set_tpoints(uint32_t group_id, uint64_t tpoint_mask);

/** Clears the specified tpoints from the current tpoint mask for the given tpoint group. */
void spdk_trace_clear_tpoints(uint32_t group_id, uint64_t tpoint_mask);

/** Returns a mask of all tracepoint groups which have at least one tracepoint enabled. */
uint64_t spdk_trace_get_tpoint_group_mask(void);

/** For each tpoint group specified in the group mask, enable all of its tpoints. */
void spdk_trace_set_tpoint_group_mask(uint64_t tpoint_group_mask);

void spdk_trace_init(const char *shm_name);
void spdk_trace_cleanup(void);
void spdk_trace_flags_init(void);

#define OWNER_NONE 0
#define OBJECT_NONE 0

void spdk_trace_register_owner(uint8_t type, char id_prefix);
void spdk_trace_register_object(uint8_t type, char id_prefix);
void spdk_trace_register_description(const char *name, const char *short_name,
				     uint16_t tpoint_id, uint8_t owner_type,
				     uint8_t object_type, uint8_t new_object,
				     uint8_t arg1_is_ptr, uint8_t arg1_is_alias,
				     const char *arg1_name);

struct spdk_trace_register_fn {
	void (*reg_fn)(void);
	struct spdk_trace_register_fn *next;
};

void spdk_trace_add_register_fn(struct spdk_trace_register_fn *reg_fn);

#define SPDK_TRACE_REGISTER_FN(fn) 				\
	static void fn(void);					\
	struct spdk_trace_register_fn reg_ ## fn = {		\
		.reg_fn = fn,					\
		.next = NULL,					\
	};							\
	__attribute__((constructor)) static void _ ## fn(void)	\
	{							\
		spdk_trace_add_register_fn(&reg_ ## fn);	\
	}							\
	static void fn(void)

#ifdef __cplusplus
}
#endif

#endif