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     ˆÉÈ„n¾ïÃÂÆ ?÷     /* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SCSI_SCSI_DEVICE_H
#define _SCSI_SCSI_DEVICE_H

#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/blk-mq.h>
#include <scsi/scsi.h>
#include <linux/atomic.h>
#include <linux/sbitmap.h>
#include <linux/dma-direction.h>

#include <linux/rh_kabi.h>

struct bsg_device;
struct device;
struct request_queue;
struct scsi_cmnd;
struct scsi_lun;
struct scsi_sense_hdr;

typedef __u64 __bitwise blist_flags_t;

#define SCSI_SENSE_BUFFERSIZE	96

struct scsi_mode_data {
	__u32	length;
	__u16	block_descriptor_length;
	__u8	medium_type;
	__u8	device_specific;
	__u8	header_length;
	__u8	longlba:1;
};

/*
 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
 * (for the ascii descriptions) and the state model enforcer:
 * scsi_lib:scsi_device_set_state().
 */
enum scsi_device_state {
	SDEV_CREATED = 1,	/* device created but not added to sysfs
				 * Only internal commands allowed (for inq) */
	SDEV_RUNNING,		/* device properly configured
				 * All commands allowed */
	SDEV_CANCEL,		/* beginning to delete device
				 * Only error handler commands allowed */
	SDEV_DEL,		/* device deleted 
				 * no commands allowed */
	SDEV_QUIESCE,		/* Device quiescent.  No block commands
				 * will be accepted, only specials (which
				 * originate in the mid-layer) */
	SDEV_OFFLINE,		/* Device offlined (by error handling or
				 * user request */
	SDEV_TRANSPORT_OFFLINE,	/* Offlined by transport class error handler */
	SDEV_BLOCK,		/* Device blocked by scsi lld.  No
				 * scsi commands from user or midlayer
				 * should be issued to the scsi
				 * lld. */
	SDEV_CREATED_BLOCK,	/* same as above but for created devices */
};

enum scsi_scan_mode {
	SCSI_SCAN_INITIAL = 0,
	SCSI_SCAN_RESCAN,
	SCSI_SCAN_MANUAL,
};

enum scsi_device_event {
	SDEV_EVT_MEDIA_CHANGE	= 1,	/* media has changed */
	SDEV_EVT_INQUIRY_CHANGE_REPORTED,		/* 3F 03  UA reported */
	SDEV_EVT_CAPACITY_CHANGE_REPORTED,		/* 2A 09  UA reported */
	SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,	/* 38 07  UA reported */
	SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,	/* 2A 01  UA reported */
	SDEV_EVT_LUN_CHANGE_REPORTED,			/* 3F 0E  UA reported */
	SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,		/* 2A 06  UA reported */
	SDEV_EVT_POWER_ON_RESET_OCCURRED,		/* 29 00  UA reported */

	SDEV_EVT_FIRST		= SDEV_EVT_MEDIA_CHANGE,
	SDEV_EVT_LAST		= SDEV_EVT_POWER_ON_RESET_OCCURRED,

	SDEV_EVT_MAXBITS	= SDEV_EVT_LAST + 1
};

struct scsi_event {
	enum scsi_device_event	evt_type;
	struct list_head	node;

	/* put union of data structures, for non-simple event types,
	 * here
	 */
};

/**
 * struct scsi_vpd - SCSI Vital Product Data
 * @rcu: For kfree_rcu().
 * @len: Length in bytes of @data.
 * @data: VPD data as defined in various T10 SCSI standard documents.
 */
struct scsi_vpd {
	struct rcu_head	rcu;
	int		len;
	unsigned char	data[];
};

struct scsi_device {
	struct Scsi_Host *host;
	struct request_queue *request_queue;

	/* the next two are protected by the host->host_lock */
	struct list_head    siblings;   /* list of all devices on this host */
	struct list_head    same_target_siblings; /* just the devices sharing same target id */

	struct sbitmap budget_map;
	atomic_t device_blocked;	/* Device returned QUEUE_FULL. */

	atomic_t restarts;
	spinlock_t list_lock;
	struct list_head starved_entry;
	unsigned short queue_depth;	/* How deep of a queue we want */
	unsigned short max_queue_depth;	/* max queue depth */
	unsigned short last_queue_full_depth; /* These two are used by */
	unsigned short last_queue_full_count; /* scsi_track_queue_full() */
	unsigned long last_queue_full_time;	/* last queue full time */
	unsigned long queue_ramp_up_period;	/* ramp up period in jiffies */
#define SCSI_DEFAULT_RAMP_UP_PERIOD	(120 * HZ)

	unsigned long last_queue_ramp_up;	/* last queue ramp up time */

	unsigned int id, channel;
	u64 lun;
	unsigned int manufacturer;	/* Manufacturer of device, for using 
					 * vendor-specific cmd's */
	unsigned sector_size;	/* size in bytes */

	void *hos