[mirror_ubuntu-artful-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. */
};

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 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 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 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;	/* Always read last sector in a 1 sector read */

	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;

	int timeout;

	struct device		sdev_gendev,
				sdev_dev;

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

	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_device_handler {
	/* Used by the infrastructure */
	struct list_head list; /* list of scsi_device_handlers */
	struct notifier_block nb;

	/* Filled by the hardware handler */
	struct module *module;
	const char *name;
	int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
	int (*activate)(struct scsi_device *);
	int (*prep_fn)(struct scsi_device *, struct request *);
};

struct scsi_dh_data {
	struct scsi_device_handler *scsi_dh;
	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;	/* 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->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_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);
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;
}
static inline int scsi_device_enclosure(struct scsi_device *sdev)
{
	return sdev->inquiry[6] & (1<<6);
}

#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
	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
a341cd0f JG	49	enum scsi_device_event {
	50	SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
	51
	52	SDEV_EVT_LAST = SDEV_EVT_MEDIA_CHANGE,
	53	SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
	54	};
	55
	56	struct scsi_event {
	57	enum scsi_device_event evt_type;
	58	struct list_head node;
	59
	60	/* put union of data structures, for non-simple event types,
	61	* here
	62	*/
	63	};
	64
1da177e4 LT	65	struct scsi_device {
	66	struct Scsi_Host *host;
	67	struct request_queue *request_queue;
	68
	69	/* the next two are protected by the host->host_lock */
	70	struct list_head siblings; /* list of all devices on this host */
	71	struct list_head same_target_siblings; /* just the devices sharing same target id */
	72
c2a9331c	73	/* this is now protected by the request_queue->queue_lock */
06f81ea8 TH	74	unsigned int device_busy; /* commands actually active on
06f81ea8 TH	75	* low-level. protected by queue_lock. */
1da177e4 LT	76	spinlock_t list_lock;
	77	struct list_head cmd_list; /* queue of in use SCSI Command structures */
	78	struct list_head starved_entry;
	79	struct scsi_cmnd current_cmnd; / currently active command */
	80	unsigned short queue_depth; /* How deep of a queue we want */
	81	unsigned short last_queue_full_depth; /* These two are used by */
	82	unsigned short last_queue_full_count; /* scsi_track_queue_full() */
	83	unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
	84	jiffie count on our counter, they
	85	could all be from the same event. */
	86
	87	unsigned int id, lun, channel;
	88
	89	unsigned int manufacturer; /* Manufacturer of device, for using
	90	* vendor-specific cmd's */
	91	unsigned sector_size; /* size in bytes */
	92
	93	void hostdata; / available to low-level driver */
1da177e4 LT	94	char type;
	95	char scsi_level;
	96	char inq_periph_qual; /* PQ from INQUIRY data */
	97	unsigned char inquiry_len; /* valid bytes in 'inquiry' */
	98	unsigned char * inquiry; /* INQUIRY response data */
7f23e146 JB	99	const char * vendor; /* [back_compat] point into 'inquiry' ... */
	100	const char * model; /* ... after scan; point to static string */
	101	const char * rev; /* ... "nullnullnullnull" before scan */
1da177e4 LT	102	unsigned char current_tag; /* current tag */
	103	struct scsi_target sdev_target; / used only for single_lun */
	104
	105	unsigned int sdev_bflags; /* black/white flags as also found in
	106	* scsi_devinfo.[hc]. For now used only to
	107	* pass settings from slave_alloc to scsi
	108	* core. */
	109	unsigned writeable:1;
	110	unsigned removable:1;
	111	unsigned changed:1; /* Data invalid due to media change */
	112	unsigned busy:1; /* Used to prevent races */
	113	unsigned lockable:1; /* Able to prevent media removal */
	114	unsigned locked:1; /* Media removal disabled */
	115	unsigned borken:1; /* Tell the Seagate driver to be
	116	* painfully slow on this device */
	117	unsigned disconnect:1; /* can disconnect */
	118	unsigned soft_reset:1; /* Uses soft reset option */
	119	unsigned sdtr:1; /* Device supports SDTR messages */
	120	unsigned wdtr:1; /* Device supports WDTR messages */
	121	unsigned ppr:1; /* Device supports PPR messages */
	122	unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
	123	unsigned simple_tags:1; /* simple queue tag messages are enabled */
	124	unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
1da177e4 LT	125	unsigned was_reset:1; /* There was a bus reset on the bus for
	126	* this device */
	127	unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
	128	* because we did a bus reset. */
	129	unsigned use_10_for_rw:1; /* first try 10-byte read / write */
	130	unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
	131	unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
	132	unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
	133	unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
	134	unsigned no_start_on_add:1; /* do not issue start on add */
	135	unsigned allow_restart:1; /* issue START_UNIT in error handler */
c3c94c5a	136	unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
d2886ea3	137	unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
1da177e4 LT	138	unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
	139	unsigned select_no_atn:1;
	140	unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
61bf54b7	141	unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
1da177e4	142	unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
a0899d4d	143	unsigned last_sector_bug:1; /* Always read last sector in a 1 sector read */
1da177e4	144
a341cd0f JG	145	DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
	146	struct list_head event_list; /* asserted events */
	147	struct work_struct event_work;
	148
1da177e4 LT	149	unsigned int device_blocked; /* Device returned QUEUE_FULL. */
	150
	151	unsigned int max_device_blocked; /* what device_blocked counts down from */
	152	#define SCSI_DEFAULT_DEVICE_BLOCKED 3
	153
	154	atomic_t iorequest_cnt;
	155	atomic_t iodone_cnt;
	156	atomic_t ioerr_cnt;
	157
	158	int timeout;
	159
ee959b00 TJ	160	struct device sdev_gendev,
ee959b00 TJ	161	sdev_dev;
1da177e4	162
ffedb452 JB	163	struct execute_work ew; /* used to get process context on put */
ffedb452 JB	164
a6a8d9f8	165	struct scsi_dh_data *scsi_dh_data;
1da177e4 LT	166	enum scsi_device_state sdev_state;
	167	unsigned long sdev_data[0];
	168	} __attribute__((aligned(sizeof(unsigned long))));
a6a8d9f8 CS	169
	170	struct scsi_device_handler {
	171	/* Used by the infrastructure */
	172	struct list_head list; /* list of scsi_device_handlers */
	173	struct notifier_block nb;
	174
	175	/* Filled by the hardware handler */
	176	struct module *module;
	177	const char *name;
	178	int (check_sense)(struct scsi_device , struct scsi_sense_hdr *);
	179	int (activate)(struct scsi_device );
	180	int (prep_fn)(struct scsi_device , struct request *);
	181	};
	182
	183	struct scsi_dh_data {
	184	struct scsi_device_handler *scsi_dh;
	185	char buf[0];
	186	};
	187
1da177e4 LT	188	#define to_scsi_device(d) \
	189	container_of(d, struct scsi_device, sdev_gendev)
	190	#define class_to_sdev(d) \
ee959b00	191	container_of(d, struct scsi_device, sdev_dev)
1da177e4	192	#define transport_class_to_sdev(class_dev) \
ee959b00	193	to_scsi_device(class_dev->parent)
1da177e4	194
9ccfc756 JB	195	#define sdev_printk(prefix, sdev, fmt, a...) \
	196	dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
	197
a4d04a4c MP	198	#define scmd_printk(prefix, scmd, fmt, a...) \
	199	(scmd)->request->rq_disk ? \
	200	sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \
	201	(scmd)->request->rq_disk->disk_name, ##a) : \
	202	sdev_printk(prefix, (scmd)->device, fmt, ##a)
01d7b3b8	203
ffedb452	204	enum scsi_target_state {
643eb2d9 JB	205	STARGET_CREATED = 1,
643eb2d9 JB	206	STARGET_RUNNING,
ffedb452 JB	207	STARGET_DEL,
	208	};
	209
1da177e4 LT	210	/*
	211	* scsi_target: representation of a scsi target, for now, this is only
	212	* used for single_lun devices. If no one has active IO to the target,
	213	* starget_sdev_user is NULL, else it points to the active sdev.
	214	*/
	215	struct scsi_target {
	216	struct scsi_device *starget_sdev_user;
	217	struct list_head siblings;
	218	struct list_head devices;
	219	struct device dev;
	220	unsigned int reap_ref; /* protected by the host lock */
	221	unsigned int channel;
	222	unsigned int id; /* target id ... replace
	223	* scsi_device.id eventually */
1bfc5d9d	224	unsigned int create:1; /* signal that it needs to be added */
25d7c363 TB	225	unsigned int single_lun:1; /* Indicates we should only
	226	* allow I/O to one of the luns
	227	* for the device at a time. */
1bfc5d9d AS	228	unsigned int pdt_1f_for_no_lun; /* PDT = 0x1f */
	229	/* means no lun present */
	230
6f3a2024	231	char scsi_level;
ffedb452 JB	232	struct execute_work ew;
ffedb452 JB	233	enum scsi_target_state state;
a283bd37 JB	234	void hostdata; / available to low-level driver */
	235	unsigned long starget_data[0]; /* for the transport */
	236	/* starget_data must be the last element!!!! */
1da177e4 LT	237	} __attribute__((aligned(sizeof(unsigned long))));
	238
	239	#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
	240	static inline struct scsi_target scsi_target(struct scsi_device sdev)
	241	{
	242	return to_scsi_target(sdev->sdev_gendev.parent);
	243	}
	244	#define transport_class_to_starget(class_dev) \
ee959b00	245	to_scsi_target(class_dev->parent)
1da177e4	246
9ccfc756 JB	247	#define starget_printk(prefix, starget, fmt, a...) \
	248	dev_printk(prefix, &(starget)->dev, fmt, ##a)
	249
1da177e4 LT	250	extern struct scsi_device __scsi_add_device(struct Scsi_Host ,
1da177e4 LT	251	uint, uint, uint, void *hostdata);
146f7262 JB	252	extern int scsi_add_device(struct Scsi_Host *host, uint channel,
146f7262 JB	253	uint target, uint lun);
a6a8d9f8	254	extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
1da177e4	255	extern void scsi_remove_device(struct scsi_device *);
a6a8d9f8	256	extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
1da177e4 LT	257
	258	extern int scsi_device_get(struct scsi_device *);
	259	extern void scsi_device_put(struct scsi_device *);
	260	extern struct scsi_device scsi_device_lookup(struct Scsi_Host ,
	261	uint, uint, uint);
	262	extern struct scsi_device __scsi_device_lookup(struct Scsi_Host ,
	263	uint, uint, uint);
	264	extern struct scsi_device scsi_device_lookup_by_target(struct scsi_target ,
	265	uint);
	266	extern struct scsi_device __scsi_device_lookup_by_target(struct scsi_target ,
	267	uint);
	268	extern void starget_for_each_device(struct scsi_target , void ,
	269	void (fn)(struct scsi_device , void *));
522939d4 MR	270	extern void __starget_for_each_device(struct scsi_target , void ,
	271	void (fn)(struct scsi_device ,
	272	void *));
1da177e4 LT	273
	274	/* only exposed to implement shost_for_each_device */
	275	extern struct scsi_device __scsi_iterate_devices(struct Scsi_Host ,
	276	struct scsi_device *);
	277
	278	/**
3e082a91 MW	279	* shost_for_each_device - iterate over all devices of a host
	280	* @sdev: the &struct scsi_device to use as a cursor
	281	* @shost: the &struct scsi_host to iterate over
1da177e4	282	*
3e082a91 MW	283	* Iterator that returns each device attached to @shost. This loop
	284	* takes a reference on each device and releases it at the end. If
	285	* you break out of the loop, you must call scsi_device_put(sdev).
1da177e4 LT	286	*/
	287	#define shost_for_each_device(sdev, shost) \
	288	for ((sdev) = __scsi_iterate_devices((shost), NULL); \
	289	(sdev); \
	290	(sdev) = __scsi_iterate_devices((shost), (sdev)))
	291
	292	/**
3e082a91 MW	293	* __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
	294	* @sdev: the &struct scsi_device to use as a cursor
	295	* @shost: the &struct scsi_host to iterate over
1da177e4	296	*
3e082a91 MW	297	* Iterator that returns each device attached to @shost. It does _not_
	298	* take a reference on the scsi_device, so the whole loop must be
	299	* protected by shost->host_lock.
1da177e4	300	*
3e082a91 MW	301	* Note: The only reason to use this is because you need to access the
	302	* device list in interrupt context. Otherwise you really want to use
	303	* shost_for_each_device instead.
1da177e4 LT	304	*/
	305	#define __shost_for_each_device(sdev, shost) \
	306	list_for_each_entry((sdev), &((shost)->__devices), siblings)
	307
	308	extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
	309	extern int scsi_track_queue_full(struct scsi_device *, int);
	310
	311	extern int scsi_set_medium_removal(struct scsi_device *, char);
	312
	313	extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
	314	unsigned char *buffer, int len, int timeout,
1cf72699	315	int retries, struct scsi_mode_data *data,
ea73a9f2	316	struct scsi_sense_hdr *);
5baba830 JB	317	extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
	318	int modepage, unsigned char *buffer, int len,
	319	int timeout, int retries,
	320	struct scsi_mode_data *data,
	321	struct scsi_sense_hdr *);
1da177e4	322	extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
001aac25	323	int retries, struct scsi_sense_hdr *sshdr);
1da177e4 LT	324	extern int scsi_device_set_state(struct scsi_device *sdev,
1da177e4 LT	325	enum scsi_device_state state);
a341cd0f JG	326	extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
	327	gfp_t gfpflags);
	328	extern void sdev_evt_send(struct scsi_device sdev, struct scsi_event evt);
	329	extern void sdev_evt_send_simple(struct scsi_device *sdev,
	330	enum scsi_device_event evt_type, gfp_t gfpflags);
1da177e4 LT	331	extern int scsi_device_quiesce(struct scsi_device *sdev);
	332	extern void scsi_device_resume(struct scsi_device *sdev);
	333	extern void scsi_target_quiesce(struct scsi_target *);
	334	extern void scsi_target_resume(struct scsi_target *);
	335	extern void scsi_scan_target(struct device *parent, unsigned int channel,
	336	unsigned int id, unsigned int lun, int rescan);
	337	extern void scsi_target_reap(struct scsi_target *);
	338	extern void scsi_target_block(struct device *);
	339	extern void scsi_target_unblock(struct device *);
	340	extern void scsi_remove_target(struct device *);
2f4701d8	341	extern void int_to_scsilun(unsigned int, struct scsi_lun *);
462b7859	342	extern int scsilun_to_int(struct scsi_lun *);
1da177e4 LT	343	extern const char *scsi_device_state_name(enum scsi_device_state);
	344	extern int scsi_is_sdev_device(const struct device *);
	345	extern int scsi_is_target_device(const struct device *);
33aa687d JB	346	extern int scsi_execute(struct scsi_device sdev, const unsigned char cmd,
	347	int data_direction, void *buffer, unsigned bufflen,
	348	unsigned char *sense, int timeout, int retries,
	349	int flag);
ea73a9f2 JB	350	extern int scsi_execute_req(struct scsi_device sdev, const unsigned char cmd,
	351	int data_direction, void *buffer, unsigned bufflen,
	352	struct scsi_sense_hdr *, int timeout, int retries);
6e68af66	353	extern int scsi_execute_async(struct scsi_device *sdev,
bb1d1073	354	const unsigned char *cmd, int cmd_len, int data_direction,
6e68af66 MC	355	void *buffer, unsigned bufflen, int use_sg,
	356	int timeout, int retries, void *privdata,
	357	void (done)(void , char *, int, int),
	358	gfp_t gfp);
33aa687d	359
cb5d9e09	360	static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
e28482c5	361	{
cb5d9e09	362	return device_reprobe(&sdev->sdev_gendev);
e28482c5 JB	363	}
e28482c5 JB	364
01d7b3b8 JG	365	static inline unsigned int sdev_channel(struct scsi_device *sdev)
	366	{
	367	return sdev->channel;
	368	}
	369
	370	static inline unsigned int sdev_id(struct scsi_device *sdev)
	371	{
	372	return sdev->id;
	373	}
	374
	375	#define scmd_id(scmd) sdev_id((scmd)->device)
	376	#define scmd_channel(scmd) sdev_channel((scmd)->device)
	377
1da177e4 LT	378	static inline int scsi_device_online(struct scsi_device *sdev)
	379	{
	380	return sdev->sdev_state != SDEV_OFFLINE;
	381	}
	382
	383	/* accessor functions for the SCSI parameters */
	384	static inline int scsi_device_sync(struct scsi_device *sdev)
	385	{
	386	return sdev->sdtr;
	387	}
	388	static inline int scsi_device_wide(struct scsi_device *sdev)
	389	{
	390	return sdev->wdtr;
	391	}
	392	static inline int scsi_device_dt(struct scsi_device *sdev)
	393	{
	394	return sdev->ppr;
	395	}
	396	static inline int scsi_device_dt_only(struct scsi_device *sdev)
	397	{
	398	if (sdev->inquiry_len < 57)
	399	return 0;
	400	return (sdev->inquiry[56] & 0x0c) == 0x04;
	401	}
	402	static inline int scsi_device_ius(struct scsi_device *sdev)
	403	{
	404	if (sdev->inquiry_len < 57)
	405	return 0;
	406	return sdev->inquiry[56] & 0x01;
	407	}
	408	static inline int scsi_device_qas(struct scsi_device *sdev)
	409	{
	410	if (sdev->inquiry_len < 57)
	411	return 0;
	412	return sdev->inquiry[56] & 0x02;
	413	}
b30c2fc1 JB	414	static inline int scsi_device_enclosure(struct scsi_device *sdev)
	415	{
	416	return sdev->inquiry[6] & (1<<6);
	417	}
d7b8bcb0 MT	418
	419	#define MODULE_ALIAS_SCSI_DEVICE(type) \
	420	MODULE_ALIAS("scsi:t-" __stringify(type) "*")
	421	#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
	422
1da177e4	423	#endif /* _SCSI_SCSI_DEVICE_H */