[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_mode_data;


/*
 * 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 */

	volatile unsigned short device_busy;	/* commands actually active on low-level */
	spinlock_t sdev_lock;           /* also the request 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 */
	char * vendor;		/* [back_compat] point into 'inquiry' ... */
	char * model;		/* ... after scan; point to static string */
	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)

/*
 * 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 */
	unsigned long		starget_data[0];
} __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)

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