[mirror_ubuntu-bionic-kernel.git] / include / scsi / scsi_device.h

#ifndef _SCSI_SCSI_DEVICE_H
#define _SCSI_SCSI_DEVICE_H

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

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. */
};

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 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;/* don't let QUEUE_FULLs on the same
					   jiffie count on our counter, they
					   could all be from the same event. */

	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 single_lun:1;	/* Indicates we should only allow I/O to
				 * one of the luns for the device at a 
				 * time. */
	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 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 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 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;

	int timeout;

	struct device		sdev_gendev;
	struct class_device	sdev_classdev;

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

	enum scsi_device_state sdev_state;
	unsigned long		sdev_data[0];
} __attribute__((aligned(sizeof(unsigned long))));
#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_classdev)
#define transport_class_to_sdev(class_dev) \
	to_scsi_device(class_dev->dev)

#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_RUNNING = 1,
	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		pdt_1f_for_no_lun;	/* PDT = 0x1f */
						/* means no lun present */

	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->dev)

#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 void scsi_remove_device(struct scsi_device *);
extern int scsi_device_cancel(struct scsi_device *, int);

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 *));

/* 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);
extern int scsi_device_set_state(struct scsi_device *sdev,
				 enum scsi_device_state state);
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 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);
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);
extern int scsi_execute_async(struct scsi_device *sdev,
			      const unsigned char *cmd, int cmd_len, int data_direction,
			      void *buffer, unsigned bufflen, int use_sg,
			      int timeout, int retries, void *privdata,
			      void (*done)(void *, char *, int, int),
			      gfp_t gfp);

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)

static inline int scsi_device_online(struct scsi_device *sdev)
{
	return sdev->sdev_state != SDEV_OFFLINE;
}

/* 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;
}
#endif /* _SCSI_SCSI_DEVICE_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _SCSI_SCSI_DEVICE_H
	2	#define _SCSI_SCSI_DEVICE_H
	3
	4	#include <linux/device.h>
	5	#include <linux/list.h>
	6	#include <linux/spinlock.h>
ffedb452	7	#include <linux/workqueue.h>
a4d04a4c	8	#include <linux/blkdev.h>
1da177e4 LT	9	#include <asm/atomic.h>
	10
	11	struct request_queue;
	12	struct scsi_cmnd;
e10fb91c	13	struct scsi_lun;
ea73a9f2	14	struct scsi_sense_hdr;
1da177e4	15
1cf72699 JB	16	struct scsi_mode_data {
	17	__u32 length;
	18	__u16 block_descriptor_length;
	19	__u8 medium_type;
	20	__u8 device_specific;
	21	__u8 header_length;
	22	__u8 longlba:1;
	23	};
	24
1da177e4 LT	25	/*
	26	* sdev state: If you alter this, you also need to alter scsi_sysfs.c
	27	* (for the ascii descriptions) and the state model enforcer:
	28	* scsi_lib:scsi_device_set_state().
	29	*/
	30	enum scsi_device_state {
	31	SDEV_CREATED = 1, /* device created but not added to sysfs
	32	* Only internal commands allowed (for inq) */
	33	SDEV_RUNNING, /* device properly configured
	34	* All commands allowed */
	35	SDEV_CANCEL, /* beginning to delete device
	36	* Only error handler commands allowed */
	37	SDEV_DEL, /* device deleted
	38	* no commands allowed */
	39	SDEV_QUIESCE, /* Device quiescent. No block commands
	40	* will be accepted, only specials (which
	41	* originate in the mid-layer) */
	42	SDEV_OFFLINE, /* Device offlined (by error handling or
	43	* user request */
	44	SDEV_BLOCK, /* Device blocked by scsi lld. No scsi
	45	* commands from user or midlayer should be issued
	46	* to the scsi lld. */
	47	};
	48
	49	struct scsi_device {
	50	struct Scsi_Host *host;
	51	struct request_queue *request_queue;
	52
	53	/* the next two are protected by the host->host_lock */
	54	struct list_head siblings; /* list of all devices on this host */
	55	struct list_head same_target_siblings; /* just the devices sharing same target id */
	56
c2a9331c	57	/* this is now protected by the request_queue->queue_lock */
06f81ea8 TH	58	unsigned int device_busy; /* commands actually active on
06f81ea8 TH	59	* low-level. protected by queue_lock. */
1da177e4 LT	60	spinlock_t list_lock;
	61	struct list_head cmd_list; /* queue of in use SCSI Command structures */
	62	struct list_head starved_entry;
	63	struct scsi_cmnd current_cmnd; / currently active command */
	64	unsigned short queue_depth; /* How deep of a queue we want */
	65	unsigned short last_queue_full_depth; /* These two are used by */
	66	unsigned short last_queue_full_count; /* scsi_track_queue_full() */
	67	unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
	68	jiffie count on our counter, they
	69	could all be from the same event. */
	70
	71	unsigned int id, lun, channel;
	72
	73	unsigned int manufacturer; /* Manufacturer of device, for using
	74	* vendor-specific cmd's */
	75	unsigned sector_size; /* size in bytes */
	76
	77	void hostdata; / available to low-level driver */
1da177e4 LT	78	char type;
	79	char scsi_level;
	80	char inq_periph_qual; /* PQ from INQUIRY data */
	81	unsigned char inquiry_len; /* valid bytes in 'inquiry' */
	82	unsigned char * inquiry; /* INQUIRY response data */
7f23e146 JB	83	const char * vendor; /* [back_compat] point into 'inquiry' ... */
	84	const char * model; /* ... after scan; point to static string */
	85	const char * rev; /* ... "nullnullnullnull" before scan */
1da177e4 LT	86	unsigned char current_tag; /* current tag */
	87	struct scsi_target sdev_target; / used only for single_lun */
	88
	89	unsigned int sdev_bflags; /* black/white flags as also found in
	90	* scsi_devinfo.[hc]. For now used only to
	91	* pass settings from slave_alloc to scsi
	92	* core. */
	93	unsigned writeable:1;
	94	unsigned removable:1;
	95	unsigned changed:1; /* Data invalid due to media change */
	96	unsigned busy:1; /* Used to prevent races */
	97	unsigned lockable:1; /* Able to prevent media removal */
	98	unsigned locked:1; /* Media removal disabled */
	99	unsigned borken:1; /* Tell the Seagate driver to be
	100	* painfully slow on this device */
	101	unsigned disconnect:1; /* can disconnect */
	102	unsigned soft_reset:1; /* Uses soft reset option */
	103	unsigned sdtr:1; /* Device supports SDTR messages */
	104	unsigned wdtr:1; /* Device supports WDTR messages */
	105	unsigned ppr:1; /* Device supports PPR messages */
	106	unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
	107	unsigned simple_tags:1; /* simple queue tag messages are enabled */
	108	unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
	109	unsigned single_lun:1; /* Indicates we should only allow I/O to
	110	* one of the luns for the device at a
	111	* time. */
	112	unsigned was_reset:1; /* There was a bus reset on the bus for
	113	* this device */
	114	unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
	115	* because we did a bus reset. */
	116	unsigned use_10_for_rw:1; /* first try 10-byte read / write */
	117	unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
	118	unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
	119	unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
	120	unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
	121	unsigned no_start_on_add:1; /* do not issue start on add */
	122	unsigned allow_restart:1; /* issue START_UNIT in error handler */
	123	unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
	124	unsigned select_no_atn:1;
	125	unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
61bf54b7	126	unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
1da177e4 LT	127	unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
	128
	129	unsigned int device_blocked; /* Device returned QUEUE_FULL. */
	130
	131	unsigned int max_device_blocked; /* what device_blocked counts down from */
	132	#define SCSI_DEFAULT_DEVICE_BLOCKED 3
	133
	134	atomic_t iorequest_cnt;
	135	atomic_t iodone_cnt;
	136	atomic_t ioerr_cnt;
	137
	138	int timeout;
	139
	140	struct device sdev_gendev;
	141	struct class_device sdev_classdev;
	142
ffedb452 JB	143	struct execute_work ew; /* used to get process context on put */
ffedb452 JB	144
1da177e4 LT	145	enum scsi_device_state sdev_state;
	146	unsigned long sdev_data[0];
	147	} __attribute__((aligned(sizeof(unsigned long))));
	148	#define to_scsi_device(d) \
	149	container_of(d, struct scsi_device, sdev_gendev)
	150	#define class_to_sdev(d) \
	151	container_of(d, struct scsi_device, sdev_classdev)
	152	#define transport_class_to_sdev(class_dev) \
	153	to_scsi_device(class_dev->dev)
	154
9ccfc756 JB	155	#define sdev_printk(prefix, sdev, fmt, a...) \
	156	dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
	157
a4d04a4c MP	158	#define scmd_printk(prefix, scmd, fmt, a...) \
	159	(scmd)->request->rq_disk ? \
	160	sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \
	161	(scmd)->request->rq_disk->disk_name, ##a) : \
	162	sdev_printk(prefix, (scmd)->device, fmt, ##a)
01d7b3b8	163
ffedb452 JB	164	enum scsi_target_state {
	165	STARGET_RUNNING = 1,
	166	STARGET_DEL,
	167	};
	168
1da177e4 LT	169	/*
	170	* scsi_target: representation of a scsi target, for now, this is only
	171	* used for single_lun devices. If no one has active IO to the target,
	172	* starget_sdev_user is NULL, else it points to the active sdev.
	173	*/
	174	struct scsi_target {
	175	struct scsi_device *starget_sdev_user;
	176	struct list_head siblings;
	177	struct list_head devices;
	178	struct device dev;
	179	unsigned int reap_ref; /* protected by the host lock */
	180	unsigned int channel;
	181	unsigned int id; /* target id ... replace
	182	* scsi_device.id eventually */
1bfc5d9d AS	183	unsigned int create:1; /* signal that it needs to be added */
	184	unsigned int pdt_1f_for_no_lun; /* PDT = 0x1f */
	185	/* means no lun present */
	186
6f3a2024	187	char scsi_level;
ffedb452 JB	188	struct execute_work ew;
ffedb452 JB	189	enum scsi_target_state state;
a283bd37 JB	190	void hostdata; / available to low-level driver */
	191	unsigned long starget_data[0]; /* for the transport */
	192	/* starget_data must be the last element!!!! */
1da177e4 LT	193	} __attribute__((aligned(sizeof(unsigned long))));
	194
	195	#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
	196	static inline struct scsi_target scsi_target(struct scsi_device sdev)
	197	{
	198	return to_scsi_target(sdev->sdev_gendev.parent);
	199	}
	200	#define transport_class_to_starget(class_dev) \
	201	to_scsi_target(class_dev->dev)
	202
9ccfc756 JB	203	#define starget_printk(prefix, starget, fmt, a...) \
	204	dev_printk(prefix, &(starget)->dev, fmt, ##a)
	205
1da177e4 LT	206	extern struct scsi_device __scsi_add_device(struct Scsi_Host ,
1da177e4 LT	207	uint, uint, uint, void *hostdata);
146f7262 JB	208	extern int scsi_add_device(struct Scsi_Host *host, uint channel,
146f7262 JB	209	uint target, uint lun);
1da177e4 LT	210	extern void scsi_remove_device(struct scsi_device *);
	211	extern int scsi_device_cancel(struct scsi_device *, int);
	212
	213	extern int scsi_device_get(struct scsi_device *);
	214	extern void scsi_device_put(struct scsi_device *);
	215	extern struct scsi_device scsi_device_lookup(struct Scsi_Host ,
	216	uint, uint, uint);
	217	extern struct scsi_device __scsi_device_lookup(struct Scsi_Host ,
	218	uint, uint, uint);
	219	extern struct scsi_device scsi_device_lookup_by_target(struct scsi_target ,
	220	uint);
	221	extern struct scsi_device __scsi_device_lookup_by_target(struct scsi_target ,
	222	uint);
	223	extern void starget_for_each_device(struct scsi_target , void ,
	224	void (fn)(struct scsi_device , void *));
	225
	226	/* only exposed to implement shost_for_each_device */
	227	extern struct scsi_device __scsi_iterate_devices(struct Scsi_Host ,
	228	struct scsi_device *);
	229
	230	/**
3e082a91 MW	231	* shost_for_each_device - iterate over all devices of a host
	232	* @sdev: the &struct scsi_device to use as a cursor
	233	* @shost: the &struct scsi_host to iterate over
1da177e4	234	*
3e082a91 MW	235	* Iterator that returns each device attached to @shost. This loop
	236	* takes a reference on each device and releases it at the end. If
	237	* you break out of the loop, you must call scsi_device_put(sdev).
1da177e4 LT	238	*/
	239	#define shost_for_each_device(sdev, shost) \
	240	for ((sdev) = __scsi_iterate_devices((shost), NULL); \
	241	(sdev); \
	242	(sdev) = __scsi_iterate_devices((shost), (sdev)))
	243
	244	/**
3e082a91 MW	245	* __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
	246	* @sdev: the &struct scsi_device to use as a cursor
	247	* @shost: the &struct scsi_host to iterate over
1da177e4	248	*
3e082a91 MW	249	* Iterator that returns each device attached to @shost. It does _not_
	250	* take a reference on the scsi_device, so the whole loop must be
	251	* protected by shost->host_lock.
1da177e4	252	*
3e082a91 MW	253	* Note: The only reason to use this is because you need to access the
	254	* device list in interrupt context. Otherwise you really want to use
	255	* shost_for_each_device instead.
1da177e4 LT	256	*/
	257	#define __shost_for_each_device(sdev, shost) \
	258	list_for_each_entry((sdev), &((shost)->__devices), siblings)
	259
	260	extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
	261	extern int scsi_track_queue_full(struct scsi_device *, int);
	262
	263	extern int scsi_set_medium_removal(struct scsi_device *, char);
	264
	265	extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
	266	unsigned char *buffer, int len, int timeout,
1cf72699	267	int retries, struct scsi_mode_data *data,
ea73a9f2	268	struct scsi_sense_hdr *);
5baba830 JB	269	extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
	270	int modepage, unsigned char *buffer, int len,
	271	int timeout, int retries,
	272	struct scsi_mode_data *data,
	273	struct scsi_sense_hdr *);
1da177e4 LT	274	extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
	275	int retries);
	276	extern int scsi_device_set_state(struct scsi_device *sdev,
	277	enum scsi_device_state state);
	278	extern int scsi_device_quiesce(struct scsi_device *sdev);
	279	extern void scsi_device_resume(struct scsi_device *sdev);
	280	extern void scsi_target_quiesce(struct scsi_target *);
	281	extern void scsi_target_resume(struct scsi_target *);
	282	extern void scsi_scan_target(struct device *parent, unsigned int channel,
	283	unsigned int id, unsigned int lun, int rescan);
	284	extern void scsi_target_reap(struct scsi_target *);
	285	extern void scsi_target_block(struct device *);
	286	extern void scsi_target_unblock(struct device *);
	287	extern void scsi_remove_target(struct device *);
2f4701d8	288	extern void int_to_scsilun(unsigned int, struct scsi_lun *);
1da177e4 LT	289	extern const char *scsi_device_state_name(enum scsi_device_state);
	290	extern int scsi_is_sdev_device(const struct device *);
	291	extern int scsi_is_target_device(const struct device *);
33aa687d JB	292	extern int scsi_execute(struct scsi_device sdev, const unsigned char cmd,
	293	int data_direction, void *buffer, unsigned bufflen,
	294	unsigned char *sense, int timeout, int retries,
	295	int flag);
ea73a9f2 JB	296	extern int scsi_execute_req(struct scsi_device sdev, const unsigned char cmd,
	297	int data_direction, void *buffer, unsigned bufflen,
	298	struct scsi_sense_hdr *, int timeout, int retries);
6e68af66	299	extern int scsi_execute_async(struct scsi_device *sdev,
bb1d1073	300	const unsigned char *cmd, int cmd_len, int data_direction,
6e68af66 MC	301	void *buffer, unsigned bufflen, int use_sg,
	302	int timeout, int retries, void *privdata,
	303	void (done)(void , char *, int, int),
	304	gfp_t gfp);
33aa687d	305
cb5d9e09	306	static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
e28482c5	307	{
cb5d9e09	308	return device_reprobe(&sdev->sdev_gendev);
e28482c5 JB	309	}
e28482c5 JB	310
01d7b3b8 JG	311	static inline unsigned int sdev_channel(struct scsi_device *sdev)
	312	{
	313	return sdev->channel;
	314	}
	315
	316	static inline unsigned int sdev_id(struct scsi_device *sdev)
	317	{
	318	return sdev->id;
	319	}
	320
	321	#define scmd_id(scmd) sdev_id((scmd)->device)
	322	#define scmd_channel(scmd) sdev_channel((scmd)->device)
	323
1da177e4 LT	324	static inline int scsi_device_online(struct scsi_device *sdev)
	325	{
	326	return sdev->sdev_state != SDEV_OFFLINE;
	327	}
	328
	329	/* accessor functions for the SCSI parameters */
	330	static inline int scsi_device_sync(struct scsi_device *sdev)
	331	{
	332	return sdev->sdtr;
	333	}
	334	static inline int scsi_device_wide(struct scsi_device *sdev)
	335	{
	336	return sdev->wdtr;
	337	}
	338	static inline int scsi_device_dt(struct scsi_device *sdev)
	339	{
	340	return sdev->ppr;
	341	}
	342	static inline int scsi_device_dt_only(struct scsi_device *sdev)
	343	{
	344	if (sdev->inquiry_len < 57)
	345	return 0;
	346	return (sdev->inquiry[56] & 0x0c) == 0x04;
	347	}
	348	static inline int scsi_device_ius(struct scsi_device *sdev)
	349	{
	350	if (sdev->inquiry_len < 57)
	351	return 0;
	352	return sdev->inquiry[56] & 0x01;
	353	}
	354	static inline int scsi_device_qas(struct scsi_device *sdev)
	355	{
	356	if (sdev->inquiry_len < 57)
	357	return 0;
	358	return sdev->inquiry[56] & 0x02;
	359	}
	360	#endif /* _SCSI_SCSI_DEVICE_H */