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/*
 * Copyright (C) 2018 Western Digital Corporation or its affiliates.
 *
 * This file is released under the GPL.
 */

#ifndef FIO_ZBD_H
#define FIO_ZBD_H

#include <inttypes.h>
#ifdef CONFIG_LINUX_BLKZONED
#include <linux/blkzoned.h>
#endif

struct fio_file;

/*
 * Zoned block device models.
 */
enum blk_zoned_model {
	ZBD_DM_NONE,	/* Regular block device */
	ZBD_DM_HOST_AWARE,	/* Host-aware zoned block device */
	ZBD_DM_HOST_MANAGED,	/* Host-managed zoned block device */
};

enum io_u_action {
	io_u_accept	= 0,
	io_u_eof	= 1,
};

/**
 * struct fio_zone_info - information about a single ZBD zone
 * @start: zone start in 512 byte units
 * @wp: zone write pointer location in 512 byte units
 * @verify_block: number of blocks that have been verified for this zone
 * @mutex: protects the modifiable members in this structure
 * @type: zone type (BLK_ZONE_TYPE_*)
 * @cond: zone state (BLK_ZONE_COND_*)
 * @open: whether or not this zone is currently open. Only relevant if
 *		max_open_zones > 0.
 * @reset_zone: whether or not this zone should be reset before writing to it
 */
struct fio_zone_info {
#ifdef CONFIG_LINUX_BLKZONED
	pthread_mutex_t		mutex;
	uint64_t		start;
	uint64_t		wp;
	uint32_t		verify_block;
	enum blk_zone_type	type:2;
	enum blk_zone_cond	cond:4;
	unsigned int		open:1;
	unsigned int		reset_zone:1;
#endif
};

/**
 * zoned_block_device_info - zoned block device characteristics
 * @model: Device model.
 * @mutex: Protects the modifiable members in this structure (refcount).
 * @zone_size: size of a single zone in units of 512 bytes
 * @zone_size_log2: log2 of the zone size in bytes if it is a power of 2 or 0
 *		if the zone size is not a power of 2.
 * @nr_zones: number of zones
 * @refcount: number of fio files that share this structure
 * @zone_info: description of the individual zones
 *
 * Only devices for which all zones have the same size are supported.
 * Note: if the capacity is not a multiple of the zone size then the last zone
 * will be smaller than 'zone_size'.
 */
struct zoned_block_device_info {
	enum blk_zoned_model	model;
	pthread_mutex_t		mutex;
	uint64_t		zone_size;
	uint32_t		zone_size_log2;
	uint32_t		nr_zones;
	uint32_t		refcount;
	struct fio_zone_info	zone_info[0];
};

#ifdef CONFIG_LINUX_BLKZONED
void zbd_free_zone_info(struct fio_file *f);
int zbd_init(struct thread_data *td);
void zbd_file_reset(struct thread_data *td, struct fio_file *f);
bool zbd_unaligned_write(int error_code);
enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u);
int zbd_do_trim(struct thread_data *td, const struct io_u *io_u);
void zbd_update_wp(struct thread_data *td, const struct io_u *io_u);
#else
static inline void zbd_free_zone_info(struct fio_file *f)
{
}

static inline int zbd_init(struct thread_data *td)
{
	return 0;
}

static inline void zbd_file_reset(struct thread_data *td, struct fio_file *f)
{
}

static inline bool zbd_unaligned_write(int error_code)
{
	return false;
}

static inline enum io_u_action zbd_adjust_block(struct thread_data *td,
						struct io_u *io_u)
{
	return io_u_accept;
}

static inline int zbd_do_trim(struct thread_data *td, const struct io_u *io_u)
{
	return 1;
}

static inline void zbd_update_wp(struct thread_data *td,
				 const struct io_u *io_u)
{
}
#endif

#endif /* FIO_ZBD_H */