[deliverable/linux.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 <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 devfs_name[256];	/* devfs junk */
	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 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;

	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...)	\
	dev_printk(prefix, &(scmd)->device->sdev_gendev, fmt, ##a)

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