[deliverable/linux.git] / include / scsi / scsi_device.h

#ifndef _SCSI_SCSI_DEVICE_H
#define _SCSI_SCSI_DEVICE_H

#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/blkdev.h>
#include <scsi/scsi.h>
#include <linux/atomic.h>

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

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_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_device_event {
	SDEV_EVT_MEDIA_CHANGE	= 1,	/* media has changed */

	SDEV_EVT_LAST		= SDEV_EVT_MEDIA_CHANGE,
	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_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 */

	/* this is now protected by the request_queue->queue_lock */
	unsigned int device_busy;	/* commands actually active on
					 * low-level. protected by queue_lock. */
	spinlock_t list_lock;
	struct list_head cmd_list;	/* queue of in use SCSI Command structures */
	struct list_head starved_entry;
	struct scsi_cmnd *current_cmnd;	/* currently active command */
	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, lun, channel;

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

	void *hostdata;		/* available to low-level driver */
	char type;
	char scsi_level;
	char inq_periph_qual;	/* PQ from INQUIRY data */	
	unsigned char inquiry_len;	/* valid bytes in 'inquiry' */
	unsigned char * inquiry;	/* INQUIRY response data */
	const char * vendor;		/* [back_compat] point into 'inquiry' ... */
	const char * model;		/* ... after scan; point to static string */
	const char * rev;		/* ... "nullnullnullnull" before scan */
	unsigned char current_tag;	/* current tag */
	struct scsi_target      *sdev_target;   /* used only for single_lun */

	unsigned int	sdev_bflags; /* black/white flags as also found in
				 * scsi_devinfo.[hc]. For now used only to
				 * pass settings from slave_alloc to scsi
				 * core. */
	unsigned writeable:1;
	unsigned removable:1;
	unsigned changed:1;	/* Data invalid due to media change */
	unsigned busy:1;	/* Used to prevent races */
	unsigned lockable:1;	/* Able to prevent media removal */
	unsigned locked:1;      /* Media removal disabled */
	unsigned borken:1;	/* Tell the Seagate driver to be 
				 * painfully slow on this device */
	unsigned disconnect:1;	/* can disconnect */
	unsigned soft_reset:1;	/* Uses soft reset option */
	unsigned sdtr:1;	/* Device supports SDTR messages */
	unsigned wdtr:1;	/* Device supports WDTR messages */
	unsigned ppr:1;		/* Device supports PPR messages */
	unsigned tagged_supported:1;	/* Supports SCSI-II tagged queuing */
	unsigned simple_tags:1;	/* simple queue tag messages are enabled */
	unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
	unsigned was_reset:1;	/* There was a bus reset on the bus for 
				 * this device */
	unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
				     * because we did a bus reset. */
	unsigned use_10_for_rw:1; /* first try 10-byte read / write */
	unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
	unsigned skip_ms_page_8:1;	/* do not use MODE SENSE page 0x08 */
	unsigned skip_ms_page_3f:1;	/* do not use MODE SENSE page 0x3f */
	unsigned skip_vpd_pages:1;	/* do not read VPD pages */
	unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
	unsigned no_start_on_add:1;	/* do not issue start on add */
	unsigned allow_restart:1; /* issue START_UNIT in error handler */
	unsigned manage_start_stop:1;	/* Let HLD (sd) manage start/stop */
	unsigned start_stop_pwr_cond:1;	/* Set power cond. in START_STOP_UNIT */
	unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
	unsigned select_no_atn:1;
	unsigned fix_capacity:1;	/* READ_CAPACITY is too high by 1 */
	unsigned guess_capacity:1;	/* READ_CAPACITY might be too high by 1 */
	unsigned retry_hwerror:1;	/* Retry HARDWARE_ERROR */
	unsigned last_sector_bug:1;	/* do not use multisector accesses on
					   SD_LAST_BUGGY_SECTORS */
	unsigned no_read_disc_info:1;	/* Avoid READ_DISC_INFO cmds */
	unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
	unsigned try_rc_10_first:1;	/* Try READ_CAPACACITY_10 first */
	unsigned is_visible:1;	/* is the device visible in sysfs */

	DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
	struct list_head event_list;	/* asserted events */
	struct work_struct event_work;

	unsigned int device_blocked;	/* Device returned QUEUE_FULL. */

	unsigned int max_device_blocked; /* what device_blocked counts down from  */
#define SCSI_DEFAULT_DEVICE_BLOCKED	3

	atomic_t iorequest_cnt;
	atomic_t iodone_cnt;
	atomic_t ioerr_cnt;

	struct device		sdev_gendev,
				sdev_dev;

	struct execute_work	ew; /* used to get process context on put */
	struct work_struct	requeue_work;

	struct scsi_dh_data	*scsi_dh_data;
	enum scsi_device_state sdev_state;
	unsigned long		sdev_data[0];
} __attribute__((aligned(sizeof(unsigned long))));

struct scsi_dh_devlist {
	char *vendor;
	char *model;
};

typedef void (*activate_complete)(void *, int);
struct scsi_device_handler {
	/* Used by the infrastructure */
	struct list_head list; /* list of scsi_device_handlers */

	/* Filled by the hardware handler */
	struct module *module;
	const char *name;
	const struct scsi_dh_devlist *devlist;
	int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
	int (*attach)(struct scsi_device *);
	void (*detach)(struct scsi_device *);
	int (*activate)(struct scsi_device *, activate_complete, void *);
	int (*prep_fn)(struct scsi_device *, struct request *);
	int (*set_params)(struct scsi_device *, const char *);
	bool (*match)(struct scsi_device *);
};

struct scsi_dh_data {
	struct scsi_device_handler *scsi_dh;
	struct scsi_device *sdev;
	struct kref kref;
	char buf[0];
};

#define	to_scsi_device(d)	\
	container_of(d, struct scsi_device, sdev_gendev)
#define	class_to_sdev(d)	\
	container_of(d, struct scsi_device, sdev_dev)
#define transport_class_to_sdev(class_dev) \
	to_scsi_device(class_dev->parent)

#define sdev_printk(prefix, sdev, fmt, a...)	\
	dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)

#define scmd_printk(prefix, scmd, fmt, a...)				\
        (scmd)->request->rq_disk ?					\
	sdev_printk(prefix, (scmd)->device, "[%s] " fmt,		\
		    (scmd)->request->rq_disk->disk_name, ##a) :		\
	sdev_printk(prefix, (scmd)->device, fmt, ##a)

enum scsi_target_state {
	STARGET_CREATED = 1,
	STARGET_RUNNING,
	STARGET_DEL,
};

/*
 * scsi_target: representation of a scsi target, for now, this is only
 * used for single_lun devices. If no one has active IO to the target,
 * starget_sdev_user is NULL, else it points to the active sdev.
 */
struct scsi_target {
	struct scsi_device	*starget_sdev_user;
	struct list_head	siblings;
	struct list_head	devices;
	struct device		dev;
	unsigned int		reap_ref; /* protected by the host lock */
	unsigned int		channel;
	unsigned int		id; /* target id ... replace
				     * scsi_device.id eventually */
	unsigned int		create:1; /* signal that it needs to be added */
	unsigned int		single_lun:1;	/* Indicates we should only
						 * allow I/O to one of the luns
						 * for the device at a time. */
	unsigned int		pdt_1f_for_no_lun:1;	/* PDT = 0x1f
						 * means no lun present. */
	unsigned int		no_report_luns:1;	/* Don't use
						 * REPORT LUNS for scanning. */
	/* commands actually active on LLD. protected by host lock. */
	unsigned int		target_busy;
	/*
	 * LLDs should set this in the slave_alloc host template callout.
	 * If set to zero then there is not limit.
	 */
	unsigned int		can_queue;
	unsigned int		target_blocked;
	unsigned int		max_target_blocked;
#define SCSI_DEFAULT_TARGET_BLOCKED	3

	char			scsi_level;
	struct execute_work	ew;
	enum scsi_target_state	state;
	void 			*hostdata; /* available to low-level driver */
	unsigned long		starget_data[0]; /* for the transport */
	/* starget_data must be the last element!!!! */
} __attribute__((aligned(sizeof(unsigned long))));

#define to_scsi_target(d)	container_of(d, struct scsi_target, dev)
static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
{
	return to_scsi_target(sdev->sdev_gendev.parent);
}
#define transport_class_to_starget(class_dev) \
	to_scsi_target(class_dev->parent)

#define starget_printk(prefix, starget, fmt, a...)	\
	dev_printk(prefix, &(starget)->dev, fmt, ##a)

extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
		uint, uint, uint, void *hostdata);
extern int scsi_add_device(struct Scsi_Host *host, uint channel,
			   uint target, uint lun);
extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
extern void scsi_remove_device(struct scsi_device *);
extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);

extern int scsi_device_get(struct scsi_device *);
extern void scsi_device_put(struct scsi_device *);
extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
					      uint, uint, uint);
extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
						uint, uint, uint);
extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
							uint);
extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
							  uint);
extern void starget_for_each_device(struct scsi_target *, void *,
		     void (*fn)(struct scsi_device *, void *));
extern void __starget_for_each_device(struct scsi_target *, void *,
				      void (*fn)(struct scsi_device *,
						 void *));

/* only exposed to implement shost_for_each_device */
extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
						  struct scsi_device *);

/**
 * shost_for_each_device - iterate over all devices of a host
 * @sdev: the &struct scsi_device to use as a cursor
 * @shost: the &struct scsi_host to iterate over
 *
 * Iterator that returns each device attached to @shost.  This loop
 * takes a reference on each device and releases it at the end.  If
 * you break out of the loop, you must call scsi_device_put(sdev).
 */
#define shost_for_each_device(sdev, shost) \
	for ((sdev) = __scsi_iterate_devices((shost), NULL); \
	     (sdev); \
	     (sdev) = __scsi_iterate_devices((shost), (sdev)))

/**
 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 * @sdev: the &struct scsi_device to use as a cursor
 * @shost: the &struct scsi_host to iterate over
 *
 * Iterator that returns each device attached to @shost.  It does _not_
 * take a reference on the scsi_device, so the whole loop must be
 * protected by shost->host_lock.
 *
 * Note: The only reason to use this is because you need to access the
 * device list in interrupt context.  Otherwise you really want to use
 * shost_for_each_device instead.
 */
#define __shost_for_each_device(sdev, shost) \
	list_for_each_entry((sdev), &((shost)->__devices), siblings)

extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
extern int scsi_track_queue_full(struct scsi_device *, int);

extern int scsi_set_medium_removal(struct scsi_device *, char);

extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
			   unsigned char *buffer, int len, int timeout,
			   int retries, struct scsi_mode_data *data,
			   struct scsi_sense_hdr *);
extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
			    int modepage, unsigned char *buffer, int len,
			    int timeout, int retries,
			    struct scsi_mode_data *data,
			    struct scsi_sense_hdr *);
extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
				int retries, struct scsi_sense_hdr *sshdr);
extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
			     int buf_len);
extern int scsi_device_set_state(struct scsi_device *sdev,
				 enum scsi_device_state state);
extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
					  gfp_t gfpflags);
extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
extern void sdev_evt_send_simple(struct scsi_device *sdev,
			  enum scsi_device_event evt_type, gfp_t gfpflags);
extern int scsi_device_quiesce(struct scsi_device *sdev);
extern void scsi_device_resume(struct scsi_device *sdev);
extern void scsi_target_quiesce(struct scsi_target *);
extern void scsi_target_resume(struct scsi_target *);
extern void scsi_scan_target(struct device *parent, unsigned int channel,
			     unsigned int id, unsigned int lun, int rescan);
extern void scsi_target_reap(struct scsi_target *);
extern void scsi_target_block(struct device *);
extern void scsi_target_unblock(struct device *);
extern void scsi_remove_target(struct device *);
extern void int_to_scsilun(unsigned int, struct scsi_lun *);
extern int scsilun_to_int(struct scsi_lun *);
extern const char *scsi_device_state_name(enum scsi_device_state);
extern int scsi_is_sdev_device(const struct device *);
extern int scsi_is_target_device(const struct device *);
extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
			int data_direction, void *buffer, unsigned bufflen,
			unsigned char *sense, int timeout, int retries,
			int flag, int *resid);
extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
			    int data_direction, void *buffer, unsigned bufflen,
			    struct scsi_sense_hdr *, int timeout, int retries,
			    int *resid);

#ifdef CONFIG_PM_RUNTIME
extern int scsi_autopm_get_device(struct scsi_device *);
extern void scsi_autopm_put_device(struct scsi_device *);
#else
static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
static inline void scsi_autopm_put_device(struct scsi_device *d) {}
#endif /* CONFIG_PM_RUNTIME */

static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
{
	return device_reprobe(&sdev->sdev_gendev);
}

static inline unsigned int sdev_channel(struct scsi_device *sdev)
{
	return sdev->channel;
}

static inline unsigned int sdev_id(struct scsi_device *sdev)
{
	return sdev->id;
}

#define scmd_id(scmd) sdev_id((scmd)->device)
#define scmd_channel(scmd) sdev_channel((scmd)->device)

/*
 * checks for positions of the SCSI state machine
 */
static inline int scsi_device_online(struct scsi_device *sdev)
{
	return (sdev->sdev_state != SDEV_OFFLINE &&
		sdev->sdev_state != SDEV_DEL);
}
static inline int scsi_device_blocked(struct scsi_device *sdev)
{
	return sdev->sdev_state == SDEV_BLOCK ||
		sdev->sdev_state == SDEV_CREATED_BLOCK;
}
static inline int scsi_device_created(struct scsi_device *sdev)
{
	return sdev->sdev_state == SDEV_CREATED ||
		sdev->sdev_state == SDEV_CREATED_BLOCK;
}

/* accessor functions for the SCSI parameters */
static inline int scsi_device_sync(struct scsi_device *sdev)
{
	return sdev->sdtr;
}
static inline int scsi_device_wide(struct scsi_device *sdev)
{
	return sdev->wdtr;
}
static inline int scsi_device_dt(struct scsi_device *sdev)
{
	return sdev->ppr;
}
static inline int scsi_device_dt_only(struct scsi_device *sdev)
{
	if (sdev->inquiry_len < 57)
		return 0;
	return (sdev->inquiry[56] & 0x0c) == 0x04;
}
static inline int scsi_device_ius(struct scsi_device *sdev)
{
	if (sdev->inquiry_len < 57)
		return 0;
	return sdev->inquiry[56] & 0x01;
}
static inline int scsi_device_qas(struct scsi_device *sdev)
{
	if (sdev->inquiry_len < 57)
		return 0;
	return sdev->inquiry[56] & 0x02;
}
static inline int scsi_device_enclosure(struct scsi_device *sdev)
{
	return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
}

static inline int scsi_device_protection(struct scsi_device *sdev)
{
	return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
}

static inline int scsi_device_tpgs(struct scsi_device *sdev)
{
	return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
}

#define MODULE_ALIAS_SCSI_DEVICE(type) \
	MODULE_ALIAS("scsi:t-" __stringify(type) "*")
#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"

#endif /* _SCSI_SCSI_DEVICE_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _SCSI_SCSI_DEVICE_H
	2	#define _SCSI_SCSI_DEVICE_H
	3
1da177e4 LT	4	#include <linux/list.h>
1da177e4 LT	5	#include <linux/spinlock.h>
ffedb452	6	#include <linux/workqueue.h>
a4d04a4c	7	#include <linux/blkdev.h>
d211f052	8	#include <scsi/scsi.h>
60063497	9	#include <linux/atomic.h>
1da177e4	10
313162d0	11	struct device;
1da177e4 LT	12	struct request_queue;
1da177e4 LT	13	struct scsi_cmnd;
e10fb91c	14	struct scsi_lun;
ea73a9f2	15	struct scsi_sense_hdr;
1da177e4	16
1cf72699 JB	17	struct scsi_mode_data {
	18	__u32 length;
	19	__u16 block_descriptor_length;
	20	__u8 medium_type;
	21	__u8 device_specific;
	22	__u8 header_length;
	23	__u8 longlba:1;
	24	};
	25
1da177e4 LT	26	/*
	27	* sdev state: If you alter this, you also need to alter scsi_sysfs.c
	28	* (for the ascii descriptions) and the state model enforcer:
	29	* scsi_lib:scsi_device_set_state().
	30	*/
	31	enum scsi_device_state {
	32	SDEV_CREATED = 1, /* device created but not added to sysfs
	33	* Only internal commands allowed (for inq) */
	34	SDEV_RUNNING, /* device properly configured
	35	* All commands allowed */
	36	SDEV_CANCEL, /* beginning to delete device
	37	* Only error handler commands allowed */
	38	SDEV_DEL, /* device deleted
	39	* no commands allowed */
	40	SDEV_QUIESCE, /* Device quiescent. No block commands
	41	* will be accepted, only specials (which
	42	* originate in the mid-layer) */
	43	SDEV_OFFLINE, /* Device offlined (by error handling or
	44	* user request */
6f4267e3 JB	45	SDEV_BLOCK, /* Device blocked by scsi lld. No
	46	* scsi commands from user or midlayer
	47	* should be issued to the scsi
	48	* lld. */
	49	SDEV_CREATED_BLOCK, /* same as above but for created devices */
1da177e4 LT	50	};
1da177e4 LT	51
a341cd0f JG	52	enum scsi_device_event {
	53	SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
	54
	55	SDEV_EVT_LAST = SDEV_EVT_MEDIA_CHANGE,
	56	SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
	57	};
	58
	59	struct scsi_event {
	60	enum scsi_device_event evt_type;
	61	struct list_head node;
	62
	63	/* put union of data structures, for non-simple event types,
	64	* here
	65	*/
	66	};
	67
1da177e4 LT	68	struct scsi_device {
	69	struct Scsi_Host *host;
	70	struct request_queue *request_queue;
	71
	72	/* the next two are protected by the host->host_lock */
	73	struct list_head siblings; /* list of all devices on this host */
	74	struct list_head same_target_siblings; /* just the devices sharing same target id */
	75
c2a9331c	76	/* this is now protected by the request_queue->queue_lock */
06f81ea8	77	unsigned int device_busy; /* commands actually active on
06f81ea8	78	* low-level. protected by queue_lock. */
1da177e4 LT	79	spinlock_t list_lock;
	80	struct list_head cmd_list; /* queue of in use SCSI Command structures */
	81	struct list_head starved_entry;
	82	struct scsi_cmnd current_cmnd; / currently active command */
	83	unsigned short queue_depth; /* How deep of a queue we want */
4a84067d	84	unsigned short max_queue_depth; /* max queue depth */
1da177e4 LT	85	unsigned short last_queue_full_depth; /* These two are used by */
1da177e4 LT	86	unsigned short last_queue_full_count; /* scsi_track_queue_full() */
4a84067d VD	87	unsigned long last_queue_full_time; /* last queue full time */
	88	unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
	89	#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
	90
	91	unsigned long last_queue_ramp_up; /* last queue ramp up time */
1da177e4 LT	92
	93	unsigned int id, lun, channel;
	94
	95	unsigned int manufacturer; /* Manufacturer of device, for using
	96	* vendor-specific cmd's */
	97	unsigned sector_size; /* size in bytes */
	98
	99	void hostdata; / available to low-level driver */
1da177e4 LT	100	char type;
	101	char scsi_level;
	102	char inq_periph_qual; /* PQ from INQUIRY data */
	103	unsigned char inquiry_len; /* valid bytes in 'inquiry' */
	104	unsigned char * inquiry; /* INQUIRY response data */
7f23e146 JB	105	const char * vendor; /* [back_compat] point into 'inquiry' ... */
	106	const char * model; /* ... after scan; point to static string */
	107	const char * rev; /* ... "nullnullnullnull" before scan */
1da177e4 LT	108	unsigned char current_tag; /* current tag */
	109	struct scsi_target sdev_target; / used only for single_lun */
	110
	111	unsigned int sdev_bflags; /* black/white flags as also found in
	112	* scsi_devinfo.[hc]. For now used only to
	113	* pass settings from slave_alloc to scsi
	114	* core. */
	115	unsigned writeable:1;
	116	unsigned removable:1;
	117	unsigned changed:1; /* Data invalid due to media change */
	118	unsigned busy:1; /* Used to prevent races */
	119	unsigned lockable:1; /* Able to prevent media removal */
	120	unsigned locked:1; /* Media removal disabled */
	121	unsigned borken:1; /* Tell the Seagate driver to be
	122	* painfully slow on this device */
	123	unsigned disconnect:1; /* can disconnect */
	124	unsigned soft_reset:1; /* Uses soft reset option */
	125	unsigned sdtr:1; /* Device supports SDTR messages */
	126	unsigned wdtr:1; /* Device supports WDTR messages */
	127	unsigned ppr:1; /* Device supports PPR messages */
	128	unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
	129	unsigned simple_tags:1; /* simple queue tag messages are enabled */
	130	unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
1da177e4 LT	131	unsigned was_reset:1; /* There was a bus reset on the bus for
	132	* this device */
	133	unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
	134	* because we did a bus reset. */
	135	unsigned use_10_for_rw:1; /* first try 10-byte read / write */
	136	unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
	137	unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
	138	unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
09b6b51b	139	unsigned skip_vpd_pages:1; /* do not read VPD pages */
1da177e4 LT	140	unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
	141	unsigned no_start_on_add:1; /* do not issue start on add */
	142	unsigned allow_restart:1; /* issue START_UNIT in error handler */
c3c94c5a	143	unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
d2886ea3	144	unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
1da177e4 LT	145	unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
	146	unsigned select_no_atn:1;
	147	unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
61bf54b7	148	unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
1da177e4	149	unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
18351070 LT	150	unsigned last_sector_bug:1; /* do not use multisector accesses on
18351070 LT	151	SD_LAST_BUGGY_SECTORS */
8e04d805	152	unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
5ce524bd	153	unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
6a0bdffa	154	unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
860dc736	155	unsigned is_visible:1; /* is the device visible in sysfs */
1da177e4	156
a341cd0f JG	157	DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
	158	struct list_head event_list; /* asserted events */
	159	struct work_struct event_work;
	160
1da177e4 LT	161	unsigned int device_blocked; /* Device returned QUEUE_FULL. */
	162
	163	unsigned int max_device_blocked; /* what device_blocked counts down from */
	164	#define SCSI_DEFAULT_DEVICE_BLOCKED 3
	165
	166	atomic_t iorequest_cnt;
	167	atomic_t iodone_cnt;
	168	atomic_t ioerr_cnt;
	169
ee959b00 TJ	170	struct device sdev_gendev,
ee959b00 TJ	171	sdev_dev;
1da177e4	172
ffedb452	173	struct execute_work ew; /* used to get process context on put */
9937a5e2	174	struct work_struct requeue_work;
ffedb452	175
a6a8d9f8	176	struct scsi_dh_data *scsi_dh_data;
1da177e4 LT	177	enum scsi_device_state sdev_state;
	178	unsigned long sdev_data[0];
	179	} __attribute__((aligned(sizeof(unsigned long))));
a6a8d9f8	180
765cbc6d HR	181	struct scsi_dh_devlist {
	182	char *vendor;
	183	char *model;
	184	};
	185
3ae31f6a	186	typedef void (activate_complete)(void , int);
a6a8d9f8 CS	187	struct scsi_device_handler {
	188	/* Used by the infrastructure */
	189	struct list_head list; /* list of scsi_device_handlers */
a6a8d9f8 CS	190
	191	/* Filled by the hardware handler */
	192	struct module *module;
	193	const char *name;
765cbc6d	194	const struct scsi_dh_devlist *devlist;
a6a8d9f8	195	int (check_sense)(struct scsi_device , struct scsi_sense_hdr *);
765cbc6d HR	196	int (attach)(struct scsi_device );
765cbc6d HR	197	void (detach)(struct scsi_device );
3ae31f6a	198	int (activate)(struct scsi_device , activate_complete, void *);
a6a8d9f8	199	int (prep_fn)(struct scsi_device , struct request *);
18ee70c9	200	int (set_params)(struct scsi_device , const char *);
6c3633d0	201	bool (match)(struct scsi_device );
a6a8d9f8 CS	202	};
	203
	204	struct scsi_dh_data {
	205	struct scsi_device_handler *scsi_dh;
6c10db72 CS	206	struct scsi_device *sdev;
6c10db72 CS	207	struct kref kref;
a6a8d9f8 CS	208	char buf[0];
	209	};
	210
1da177e4 LT	211	#define to_scsi_device(d) \
	212	container_of(d, struct scsi_device, sdev_gendev)
	213	#define class_to_sdev(d) \
ee959b00	214	container_of(d, struct scsi_device, sdev_dev)
1da177e4	215	#define transport_class_to_sdev(class_dev) \
ee959b00	216	to_scsi_device(class_dev->parent)
1da177e4	217
9ccfc756 JB	218	#define sdev_printk(prefix, sdev, fmt, a...) \
	219	dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
	220
a4d04a4c MP	221	#define scmd_printk(prefix, scmd, fmt, a...) \
	222	(scmd)->request->rq_disk ? \
	223	sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \
	224	(scmd)->request->rq_disk->disk_name, ##a) : \
	225	sdev_printk(prefix, (scmd)->device, fmt, ##a)
01d7b3b8	226
ffedb452	227	enum scsi_target_state {
643eb2d9 JB	228	STARGET_CREATED = 1,
643eb2d9 JB	229	STARGET_RUNNING,
ffedb452 JB	230	STARGET_DEL,
	231	};
	232
1da177e4 LT	233	/*
	234	* scsi_target: representation of a scsi target, for now, this is only
	235	* used for single_lun devices. If no one has active IO to the target,
	236	* starget_sdev_user is NULL, else it points to the active sdev.
	237	*/
	238	struct scsi_target {
	239	struct scsi_device *starget_sdev_user;
	240	struct list_head siblings;
	241	struct list_head devices;
	242	struct device dev;
	243	unsigned int reap_ref; /* protected by the host lock */
	244	unsigned int channel;
	245	unsigned int id; /* target id ... replace
	246	* scsi_device.id eventually */
1bfc5d9d	247	unsigned int create:1; /* signal that it needs to be added */
25d7c363 TB	248	unsigned int single_lun:1; /* Indicates we should only
	249	* allow I/O to one of the luns
	250	* for the device at a time. */
de8c46bf AS	251	unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
de8c46bf AS	252	* means no lun present. */
09b6b51b AS	253	unsigned int no_report_luns:1; /* Don't use
09b6b51b AS	254	* REPORT LUNS for scanning. */
f0c0a376 MC	255	/* commands actually active on LLD. protected by host lock. */
	256	unsigned int target_busy;
	257	/*
	258	* LLDs should set this in the slave_alloc host template callout.
	259	* If set to zero then there is not limit.
	260	*/
	261	unsigned int can_queue;
	262	unsigned int target_blocked;
	263	unsigned int max_target_blocked;
	264	#define SCSI_DEFAULT_TARGET_BLOCKED 3
1bfc5d9d	265
6f3a2024	266	char scsi_level;
ffedb452 JB	267	struct execute_work ew;
ffedb452 JB	268	enum scsi_target_state state;
a283bd37 JB	269	void hostdata; / available to low-level driver */
	270	unsigned long starget_data[0]; /* for the transport */
	271	/* starget_data must be the last element!!!! */
1da177e4 LT	272	} __attribute__((aligned(sizeof(unsigned long))));
	273
	274	#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
	275	static inline struct scsi_target scsi_target(struct scsi_device sdev)
	276	{
	277	return to_scsi_target(sdev->sdev_gendev.parent);
	278	}
	279	#define transport_class_to_starget(class_dev) \
ee959b00	280	to_scsi_target(class_dev->parent)
1da177e4	281
9ccfc756 JB	282	#define starget_printk(prefix, starget, fmt, a...) \
	283	dev_printk(prefix, &(starget)->dev, fmt, ##a)
	284
1da177e4 LT	285	extern struct scsi_device __scsi_add_device(struct Scsi_Host ,
1da177e4 LT	286	uint, uint, uint, void *hostdata);
146f7262 JB	287	extern int scsi_add_device(struct Scsi_Host *host, uint channel,
146f7262 JB	288	uint target, uint lun);
a6a8d9f8	289	extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
1da177e4	290	extern void scsi_remove_device(struct scsi_device *);
a6a8d9f8	291	extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
1da177e4 LT	292
	293	extern int scsi_device_get(struct scsi_device *);
	294	extern void scsi_device_put(struct scsi_device *);
	295	extern struct scsi_device scsi_device_lookup(struct Scsi_Host ,
	296	uint, uint, uint);
	297	extern struct scsi_device __scsi_device_lookup(struct Scsi_Host ,
	298	uint, uint, uint);
	299	extern struct scsi_device scsi_device_lookup_by_target(struct scsi_target ,
	300	uint);
	301	extern struct scsi_device __scsi_device_lookup_by_target(struct scsi_target ,
	302	uint);
	303	extern void starget_for_each_device(struct scsi_target , void ,
	304	void (fn)(struct scsi_device , void *));
522939d4 MR	305	extern void __starget_for_each_device(struct scsi_target , void ,
	306	void (fn)(struct scsi_device ,
	307	void *));
1da177e4 LT	308
	309	/* only exposed to implement shost_for_each_device */
	310	extern struct scsi_device __scsi_iterate_devices(struct Scsi_Host ,
	311	struct scsi_device *);
	312
	313	/**
3e082a91 MW	314	* shost_for_each_device - iterate over all devices of a host
	315	* @sdev: the &struct scsi_device to use as a cursor
	316	* @shost: the &struct scsi_host to iterate over
1da177e4	317	*
3e082a91 MW	318	* Iterator that returns each device attached to @shost. This loop
	319	* takes a reference on each device and releases it at the end. If
	320	* you break out of the loop, you must call scsi_device_put(sdev).
1da177e4 LT	321	*/
	322	#define shost_for_each_device(sdev, shost) \
	323	for ((sdev) = __scsi_iterate_devices((shost), NULL); \
	324	(sdev); \
	325	(sdev) = __scsi_iterate_devices((shost), (sdev)))
	326
	327	/**
3e082a91 MW	328	* __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
	329	* @sdev: the &struct scsi_device to use as a cursor
	330	* @shost: the &struct scsi_host to iterate over
1da177e4	331	*
3e082a91 MW	332	* Iterator that returns each device attached to @shost. It does _not_
	333	* take a reference on the scsi_device, so the whole loop must be
	334	* protected by shost->host_lock.
1da177e4	335	*
3e082a91 MW	336	* Note: The only reason to use this is because you need to access the
	337	* device list in interrupt context. Otherwise you really want to use
	338	* shost_for_each_device instead.
1da177e4 LT	339	*/
	340	#define __shost_for_each_device(sdev, shost) \
	341	list_for_each_entry((sdev), &((shost)->__devices), siblings)
	342
	343	extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
	344	extern int scsi_track_queue_full(struct scsi_device *, int);
	345
	346	extern int scsi_set_medium_removal(struct scsi_device *, char);
	347
	348	extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
	349	unsigned char *buffer, int len, int timeout,
1cf72699	350	int retries, struct scsi_mode_data *data,
ea73a9f2	351	struct scsi_sense_hdr *);
5baba830 JB	352	extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
	353	int modepage, unsigned char *buffer, int len,
	354	int timeout, int retries,
	355	struct scsi_mode_data *data,
	356	struct scsi_sense_hdr *);
1da177e4	357	extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
001aac25	358	int retries, struct scsi_sense_hdr *sshdr);
e3deec09 JB	359	extern int scsi_get_vpd_page(struct scsi_device , u8 page, unsigned char buf,
e3deec09 JB	360	int buf_len);
1da177e4 LT	361	extern int scsi_device_set_state(struct scsi_device *sdev,
1da177e4 LT	362	enum scsi_device_state state);
a341cd0f JG	363	extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
	364	gfp_t gfpflags);
	365	extern void sdev_evt_send(struct scsi_device sdev, struct scsi_event evt);
	366	extern void sdev_evt_send_simple(struct scsi_device *sdev,
	367	enum scsi_device_event evt_type, gfp_t gfpflags);
1da177e4 LT	368	extern int scsi_device_quiesce(struct scsi_device *sdev);
	369	extern void scsi_device_resume(struct scsi_device *sdev);
	370	extern void scsi_target_quiesce(struct scsi_target *);
	371	extern void scsi_target_resume(struct scsi_target *);
	372	extern void scsi_scan_target(struct device *parent, unsigned int channel,
	373	unsigned int id, unsigned int lun, int rescan);
	374	extern void scsi_target_reap(struct scsi_target *);
	375	extern void scsi_target_block(struct device *);
	376	extern void scsi_target_unblock(struct device *);
	377	extern void scsi_remove_target(struct device *);
2f4701d8	378	extern void int_to_scsilun(unsigned int, struct scsi_lun *);
462b7859	379	extern int scsilun_to_int(struct scsi_lun *);
1da177e4 LT	380	extern const char *scsi_device_state_name(enum scsi_device_state);
	381	extern int scsi_is_sdev_device(const struct device *);
	382	extern int scsi_is_target_device(const struct device *);
33aa687d JB	383	extern int scsi_execute(struct scsi_device sdev, const unsigned char cmd,
	384	int data_direction, void *buffer, unsigned bufflen,
	385	unsigned char *sense, int timeout, int retries,
f4f4e47e	386	int flag, int *resid);
ea73a9f2 JB	387	extern int scsi_execute_req(struct scsi_device sdev, const unsigned char cmd,
ea73a9f2 JB	388	int data_direction, void *buffer, unsigned bufflen,
f4f4e47e FT	389	struct scsi_sense_hdr *, int timeout, int retries,
f4f4e47e FT	390	int *resid);
33aa687d	391
bc4f2401 AS	392	#ifdef CONFIG_PM_RUNTIME
	393	extern int scsi_autopm_get_device(struct scsi_device *);
	394	extern void scsi_autopm_put_device(struct scsi_device *);
	395	#else
	396	static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
	397	static inline void scsi_autopm_put_device(struct scsi_device *d) {}
	398	#endif /* CONFIG_PM_RUNTIME */
	399
cb5d9e09	400	static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
e28482c5	401	{
cb5d9e09	402	return device_reprobe(&sdev->sdev_gendev);
e28482c5 JB	403	}
e28482c5 JB	404
01d7b3b8 JG	405	static inline unsigned int sdev_channel(struct scsi_device *sdev)
	406	{
	407	return sdev->channel;
	408	}
	409
	410	static inline unsigned int sdev_id(struct scsi_device *sdev)
	411	{
	412	return sdev->id;
	413	}
	414
	415	#define scmd_id(scmd) sdev_id((scmd)->device)
	416	#define scmd_channel(scmd) sdev_channel((scmd)->device)
	417
0f1d87a2 JB	418	/*
	419	* checks for positions of the SCSI state machine
	420	*/
1da177e4 LT	421	static inline int scsi_device_online(struct scsi_device *sdev)
1da177e4 LT	422	{
0762a482 HR	423	return (sdev->sdev_state != SDEV_OFFLINE &&
0762a482 HR	424	sdev->sdev_state != SDEV_DEL);
1da177e4	425	}
0f1d87a2 JB	426	static inline int scsi_device_blocked(struct scsi_device *sdev)
0f1d87a2 JB	427	{
6f4267e3 JB	428	return sdev->sdev_state == SDEV_BLOCK \|\|
6f4267e3 JB	429	sdev->sdev_state == SDEV_CREATED_BLOCK;
0f1d87a2 JB	430	}
	431	static inline int scsi_device_created(struct scsi_device *sdev)
	432	{
6f4267e3 JB	433	return sdev->sdev_state == SDEV_CREATED \|\|
6f4267e3 JB	434	sdev->sdev_state == SDEV_CREATED_BLOCK;
0f1d87a2	435	}
1da177e4 LT	436
	437	/* accessor functions for the SCSI parameters */
	438	static inline int scsi_device_sync(struct scsi_device *sdev)
	439	{
	440	return sdev->sdtr;
	441	}
	442	static inline int scsi_device_wide(struct scsi_device *sdev)
	443	{
	444	return sdev->wdtr;
	445	}
	446	static inline int scsi_device_dt(struct scsi_device *sdev)
	447	{
	448	return sdev->ppr;
	449	}
	450	static inline int scsi_device_dt_only(struct scsi_device *sdev)
	451	{
	452	if (sdev->inquiry_len < 57)
	453	return 0;
	454	return (sdev->inquiry[56] & 0x0c) == 0x04;
	455	}
	456	static inline int scsi_device_ius(struct scsi_device *sdev)
	457	{
	458	if (sdev->inquiry_len < 57)
	459	return 0;
	460	return sdev->inquiry[56] & 0x01;
	461	}
	462	static inline int scsi_device_qas(struct scsi_device *sdev)
	463	{
	464	if (sdev->inquiry_len < 57)
	465	return 0;
	466	return sdev->inquiry[56] & 0x02;
	467	}
b30c2fc1 JB	468	static inline int scsi_device_enclosure(struct scsi_device *sdev)
b30c2fc1 JB	469	{
d1e12de8	470	return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
b30c2fc1	471	}
d7b8bcb0	472
7027ad72 MP	473	static inline int scsi_device_protection(struct scsi_device *sdev)
7027ad72 MP	474	{
d211f052	475	return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
7027ad72 MP	476	}
7027ad72 MP	477
d7c48feb HR	478	static inline int scsi_device_tpgs(struct scsi_device *sdev)
	479	{
	480	return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
	481	}
	482
d7b8bcb0 MT	483	#define MODULE_ALIAS_SCSI_DEVICE(type) \
	484	MODULE_ALIAS("scsi:t-" __stringify(type) "*")
	485	#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
	486
1da177e4	487	#endif /* _SCSI_SCSI_DEVICE_H */