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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _SCSI_SCSI_DEVICE_H
2#define _SCSI_SCSI_DEVICE_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#include <linux/list.h>
5#include <linux/spinlock.h>
James Bottomleyffedb452006-02-23 14:27:18 -06006#include <linux/workqueue.h>
Martin K. Petersena4d04a42007-02-27 22:40:27 -05007#include <linux/blkdev.h>
Hugh Dickinsd211f052008-08-06 18:21:18 +01008#include <scsi/scsi.h>
Arun Sharma60063492011-07-26 16:09:06 -07009#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
Paul Gortmaker313162d2012-01-30 11:46:54 -050011struct device;
Linus Torvalds1da177e2005-04-16 15:20:36 -070012struct request_queue;
13struct scsi_cmnd;
James Bottomleye10fb912005-07-14 11:54:17 -050014struct scsi_lun;
James Bottomleyea73a9f2005-08-28 11:33:52 -050015struct scsi_sense_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
James Bottomley1cf72692005-08-28 11:27:01 -050017struct scsi_mode_data {
18 __u32 length;
19 __u16 block_descriptor_length;
20 __u8 medium_type;
21 __u8 device_specific;
22 __u8 header_length;
23 __u8 longlba:1;
24};
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026/*
27 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
28 * (for the ascii descriptions) and the state model enforcer:
29 * scsi_lib:scsi_device_set_state().
30 */
31enum scsi_device_state {
32 SDEV_CREATED = 1, /* device created but not added to sysfs
33 * Only internal commands allowed (for inq) */
34 SDEV_RUNNING, /* device properly configured
35 * All commands allowed */
36 SDEV_CANCEL, /* beginning to delete device
37 * Only error handler commands allowed */
38 SDEV_DEL, /* device deleted
39 * no commands allowed */
40 SDEV_QUIESCE, /* Device quiescent. No block commands
41 * will be accepted, only specials (which
42 * originate in the mid-layer) */
43 SDEV_OFFLINE, /* Device offlined (by error handling or
44 * user request */
James Bottomley6f4267e2008-08-22 16:53:31 -050045 SDEV_BLOCK, /* Device blocked by scsi lld. No
46 * scsi commands from user or midlayer
47 * should be issued to the scsi
48 * lld. */
49 SDEV_CREATED_BLOCK, /* same as above but for created devices */
Linus Torvalds1da177e2005-04-16 15:20:36 -070050};
51
Jeff Garzika341cd02007-10-29 17:15:22 -040052enum scsi_device_event {
53 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
54
55 SDEV_EVT_LAST = SDEV_EVT_MEDIA_CHANGE,
56 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
57};
58
59struct scsi_event {
60 enum scsi_device_event evt_type;
61 struct list_head node;
62
63 /* put union of data structures, for non-simple event types,
64 * here
65 */
66};
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068struct scsi_device {
69 struct Scsi_Host *host;
70 struct request_queue *request_queue;
71
72 /* the next two are protected by the host->host_lock */
73 struct list_head siblings; /* list of all devices on this host */
74 struct list_head same_target_siblings; /* just the devices sharing same target id */
75
c2a93312005-04-12 16:38:09 -050076 /* this is now protected by the request_queue->queue_lock */
06f81ea2005-04-17 14:57:29 -050077 unsigned int device_busy; /* commands actually active on
78 * low-level. protected by queue_lock. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 spinlock_t list_lock;
80 struct list_head cmd_list; /* queue of in use SCSI Command structures */
81 struct list_head starved_entry;
82 struct scsi_cmnd *current_cmnd; /* currently active command */
83 unsigned short queue_depth; /* How deep of a queue we want */
Vasu Dev4a840672009-10-22 15:46:33 -070084 unsigned short max_queue_depth; /* max queue depth */
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 unsigned short last_queue_full_depth; /* These two are used by */
86 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
Vasu Dev4a840672009-10-22 15:46:33 -070087 unsigned long last_queue_full_time; /* last queue full time */
88 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
89#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
90
91 unsigned long last_queue_ramp_up; /* last queue ramp up time */
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93 unsigned int id, lun, channel;
94
95 unsigned int manufacturer; /* Manufacturer of device, for using
96 * vendor-specific cmd's */
97 unsigned sector_size; /* size in bytes */
98
99 void *hostdata; /* available to low-level driver */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 char type;
101 char scsi_level;
102 char inq_periph_qual; /* PQ from INQUIRY data */
103 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
104 unsigned char * inquiry; /* INQUIRY response data */
James Bottomley7f23e142005-12-01 12:50:13 -0600105 const char * vendor; /* [back_compat] point into 'inquiry' ... */
106 const char * model; /* ... after scan; point to static string */
107 const char * rev; /* ... "nullnullnullnull" before scan */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 unsigned char current_tag; /* current tag */
109 struct scsi_target *sdev_target; /* used only for single_lun */
110
111 unsigned int sdev_bflags; /* black/white flags as also found in
112 * scsi_devinfo.[hc]. For now used only to
113 * pass settings from slave_alloc to scsi
114 * core. */
115 unsigned writeable:1;
116 unsigned removable:1;
117 unsigned changed:1; /* Data invalid due to media change */
118 unsigned busy:1; /* Used to prevent races */
119 unsigned lockable:1; /* Able to prevent media removal */
120 unsigned locked:1; /* Media removal disabled */
121 unsigned borken:1; /* Tell the Seagate driver to be
122 * painfully slow on this device */
123 unsigned disconnect:1; /* can disconnect */
124 unsigned soft_reset:1; /* Uses soft reset option */
125 unsigned sdtr:1; /* Device supports SDTR messages */
126 unsigned wdtr:1; /* Device supports WDTR messages */
127 unsigned ppr:1; /* Device supports PPR messages */
128 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
129 unsigned simple_tags:1; /* simple queue tag messages are enabled */
130 unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 unsigned was_reset:1; /* There was a bus reset on the bus for
132 * this device */
133 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
134 * because we did a bus reset. */
135 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
136 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
137 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
138 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
Alan Stern09b6b512012-01-10 13:43:30 -0500139 unsigned skip_vpd_pages:1; /* do not read VPD pages */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
141 unsigned no_start_on_add:1; /* do not issue start on add */
142 unsigned allow_restart:1; /* issue START_UNIT in error handler */
Tejun Heoc3c94c52007-03-21 00:13:59 +0900143 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
Stefan Richterd2886ea2008-05-11 00:34:07 +0200144 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
146 unsigned select_no_atn:1;
147 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
Oliver Neukum61bf54b2007-02-08 09:04:48 +0100148 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
Linus Torvalds18351072008-08-05 21:42:21 -0700150 unsigned last_sector_bug:1; /* do not use multisector accesses on
151 SD_LAST_BUGGY_SECTORS */
Hans de Goede8e04d802010-10-01 14:20:08 -0700152 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
Hans de Goede5ce524b2010-10-01 14:20:10 -0700153 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
James Bottomley860dc732009-11-19 17:48:29 -0500154 unsigned is_visible:1; /* is the device visible in sysfs */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Jeff Garzika341cd02007-10-29 17:15:22 -0400156 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
157 struct list_head event_list; /* asserted events */
158 struct work_struct event_work;
159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 unsigned int device_blocked; /* Device returned QUEUE_FULL. */
161
162 unsigned int max_device_blocked; /* what device_blocked counts down from */
163#define SCSI_DEFAULT_DEVICE_BLOCKED 3
164
165 atomic_t iorequest_cnt;
166 atomic_t iodone_cnt;
167 atomic_t ioerr_cnt;
168
Tony Jonesee959b02008-02-22 00:13:36 +0100169 struct device sdev_gendev,
170 sdev_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
James Bottomleyffedb452006-02-23 14:27:18 -0600172 struct execute_work ew; /* used to get process context on put */
Jens Axboe9937a5e2011-05-17 11:04:44 +0200173 struct work_struct requeue_work;
James Bottomleyffedb452006-02-23 14:27:18 -0600174
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700175 struct scsi_dh_data *scsi_dh_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 enum scsi_device_state sdev_state;
177 unsigned long sdev_data[0];
178} __attribute__((aligned(sizeof(unsigned long))));
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700179
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700180struct scsi_dh_devlist {
181 char *vendor;
182 char *model;
183};
184
Chandra Seetharaman3ae31f62009-10-21 09:22:46 -0700185typedef void (*activate_complete)(void *, int);
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700186struct scsi_device_handler {
187 /* Used by the infrastructure */
188 struct list_head list; /* list of scsi_device_handlers */
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700189
190 /* Filled by the hardware handler */
191 struct module *module;
192 const char *name;
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700193 const struct scsi_dh_devlist *devlist;
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700194 int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700195 int (*attach)(struct scsi_device *);
196 void (*detach)(struct scsi_device *);
Chandra Seetharaman3ae31f62009-10-21 09:22:46 -0700197 int (*activate)(struct scsi_device *, activate_complete, void *);
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700198 int (*prep_fn)(struct scsi_device *, struct request *);
Chandra Seetharaman18ee70c2009-08-03 12:42:33 -0700199 int (*set_params)(struct scsi_device *, const char *);
Hannes Reinecke6c3633d2011-08-24 10:51:15 +0200200 bool (*match)(struct scsi_device *);
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700201};
202
203struct scsi_dh_data {
204 struct scsi_device_handler *scsi_dh;
Chandra Seetharaman6c10db72009-06-26 19:30:06 -0700205 struct scsi_device *sdev;
206 struct kref kref;
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700207 char buf[0];
208};
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210#define to_scsi_device(d) \
211 container_of(d, struct scsi_device, sdev_gendev)
212#define class_to_sdev(d) \
Tony Jonesee959b02008-02-22 00:13:36 +0100213 container_of(d, struct scsi_device, sdev_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214#define transport_class_to_sdev(class_dev) \
Tony Jonesee959b02008-02-22 00:13:36 +0100215 to_scsi_device(class_dev->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
James Bottomley9ccfc752005-10-02 11:45:08 -0500217#define sdev_printk(prefix, sdev, fmt, a...) \
218 dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
219
Martin K. Petersena4d04a42007-02-27 22:40:27 -0500220#define scmd_printk(prefix, scmd, fmt, a...) \
221 (scmd)->request->rq_disk ? \
222 sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \
223 (scmd)->request->rq_disk->disk_name, ##a) : \
224 sdev_printk(prefix, (scmd)->device, fmt, ##a)
Jeff Garzik01d7b3b2005-10-24 18:03:34 -0400225
James Bottomleyffedb452006-02-23 14:27:18 -0600226enum scsi_target_state {
James Bottomley643eb2d2008-03-22 22:42:27 -0500227 STARGET_CREATED = 1,
228 STARGET_RUNNING,
James Bottomleyffedb452006-02-23 14:27:18 -0600229 STARGET_DEL,
230};
231
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232/*
233 * scsi_target: representation of a scsi target, for now, this is only
234 * used for single_lun devices. If no one has active IO to the target,
235 * starget_sdev_user is NULL, else it points to the active sdev.
236 */
237struct scsi_target {
238 struct scsi_device *starget_sdev_user;
239 struct list_head siblings;
240 struct list_head devices;
241 struct device dev;
242 unsigned int reap_ref; /* protected by the host lock */
243 unsigned int channel;
244 unsigned int id; /* target id ... replace
245 * scsi_device.id eventually */
Alan Stern1bfc5d92006-02-09 15:26:18 -0500246 unsigned int create:1; /* signal that it needs to be added */
Tony Battersby25d7c362007-11-12 10:00:44 -0500247 unsigned int single_lun:1; /* Indicates we should only
248 * allow I/O to one of the luns
249 * for the device at a time. */
Alan Sternde8c46b2012-01-10 13:43:04 -0500250 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
251 * means no lun present. */
Alan Stern09b6b512012-01-10 13:43:30 -0500252 unsigned int no_report_luns:1; /* Don't use
253 * REPORT LUNS for scanning. */
Mike Christief0c0a372008-08-17 15:24:38 -0500254 /* commands actually active on LLD. protected by host lock. */
255 unsigned int target_busy;
256 /*
257 * LLDs should set this in the slave_alloc host template callout.
258 * If set to zero then there is not limit.
259 */
260 unsigned int can_queue;
261 unsigned int target_blocked;
262 unsigned int max_target_blocked;
263#define SCSI_DEFAULT_TARGET_BLOCKED 3
Alan Stern1bfc5d92006-02-09 15:26:18 -0500264
James Bottomley6f3a2022005-09-22 20:33:28 -0500265 char scsi_level;
James Bottomleyffedb452006-02-23 14:27:18 -0600266 struct execute_work ew;
267 enum scsi_target_state state;
James Bottomleya283bd32005-05-24 12:06:38 -0500268 void *hostdata; /* available to low-level driver */
269 unsigned long starget_data[0]; /* for the transport */
270 /* starget_data must be the last element!!!! */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271} __attribute__((aligned(sizeof(unsigned long))));
272
273#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
274static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
275{
276 return to_scsi_target(sdev->sdev_gendev.parent);
277}
278#define transport_class_to_starget(class_dev) \
Tony Jonesee959b02008-02-22 00:13:36 +0100279 to_scsi_target(class_dev->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
James Bottomley9ccfc752005-10-02 11:45:08 -0500281#define starget_printk(prefix, starget, fmt, a...) \
282 dev_printk(prefix, &(starget)->dev, fmt, ##a)
283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
285 uint, uint, uint, void *hostdata);
James Bottomley146f7262005-09-10 12:44:09 -0500286extern int scsi_add_device(struct Scsi_Host *host, uint channel,
287 uint target, uint lun);
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700288extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289extern void scsi_remove_device(struct scsi_device *);
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700290extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292extern int scsi_device_get(struct scsi_device *);
293extern void scsi_device_put(struct scsi_device *);
294extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
295 uint, uint, uint);
296extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
297 uint, uint, uint);
298extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
299 uint);
300extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
301 uint);
302extern void starget_for_each_device(struct scsi_target *, void *,
303 void (*fn)(struct scsi_device *, void *));
Maciej W. Rozycki522939d2007-12-10 15:49:31 -0800304extern void __starget_for_each_device(struct scsi_target *, void *,
305 void (*fn)(struct scsi_device *,
306 void *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
308/* only exposed to implement shost_for_each_device */
309extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
310 struct scsi_device *);
311
312/**
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600313 * shost_for_each_device - iterate over all devices of a host
314 * @sdev: the &struct scsi_device to use as a cursor
315 * @shost: the &struct scsi_host to iterate over
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 *
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600317 * Iterator that returns each device attached to @shost. This loop
318 * takes a reference on each device and releases it at the end. If
319 * you break out of the loop, you must call scsi_device_put(sdev).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 */
321#define shost_for_each_device(sdev, shost) \
322 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
323 (sdev); \
324 (sdev) = __scsi_iterate_devices((shost), (sdev)))
325
326/**
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600327 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
328 * @sdev: the &struct scsi_device to use as a cursor
329 * @shost: the &struct scsi_host to iterate over
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 *
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600331 * Iterator that returns each device attached to @shost. It does _not_
332 * take a reference on the scsi_device, so the whole loop must be
333 * protected by shost->host_lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 *
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600335 * Note: The only reason to use this is because you need to access the
336 * device list in interrupt context. Otherwise you really want to use
337 * shost_for_each_device instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 */
339#define __shost_for_each_device(sdev, shost) \
340 list_for_each_entry((sdev), &((shost)->__devices), siblings)
341
342extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
343extern int scsi_track_queue_full(struct scsi_device *, int);
344
345extern int scsi_set_medium_removal(struct scsi_device *, char);
346
347extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
348 unsigned char *buffer, int len, int timeout,
James Bottomley1cf72692005-08-28 11:27:01 -0500349 int retries, struct scsi_mode_data *data,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500350 struct scsi_sense_hdr *);
James Bottomley5baba832006-03-18 14:10:35 -0600351extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
352 int modepage, unsigned char *buffer, int len,
353 int timeout, int retries,
354 struct scsi_mode_data *data,
355 struct scsi_sense_hdr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
James Bottomley001aac22007-12-02 19:10:40 +0200357 int retries, struct scsi_sense_hdr *sshdr);
James Bottomleye3deec02009-11-03 12:33:07 -0600358extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
359 int buf_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360extern int scsi_device_set_state(struct scsi_device *sdev,
361 enum scsi_device_state state);
Jeff Garzika341cd02007-10-29 17:15:22 -0400362extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
363 gfp_t gfpflags);
364extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
365extern void sdev_evt_send_simple(struct scsi_device *sdev,
366 enum scsi_device_event evt_type, gfp_t gfpflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367extern int scsi_device_quiesce(struct scsi_device *sdev);
368extern void scsi_device_resume(struct scsi_device *sdev);
369extern void scsi_target_quiesce(struct scsi_target *);
370extern void scsi_target_resume(struct scsi_target *);
371extern void scsi_scan_target(struct device *parent, unsigned int channel,
372 unsigned int id, unsigned int lun, int rescan);
373extern void scsi_target_reap(struct scsi_target *);
374extern void scsi_target_block(struct device *);
375extern void scsi_target_unblock(struct device *);
376extern void scsi_remove_target(struct device *);
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -0400377extern void int_to_scsilun(unsigned int, struct scsi_lun *);
Christof Schmitt462b7852007-06-19 10:25:30 +0200378extern int scsilun_to_int(struct scsi_lun *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379extern const char *scsi_device_state_name(enum scsi_device_state);
380extern int scsi_is_sdev_device(const struct device *);
381extern int scsi_is_target_device(const struct device *);
James Bottomley33aa6872005-08-28 11:31:14 -0500382extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
383 int data_direction, void *buffer, unsigned bufflen,
384 unsigned char *sense, int timeout, int retries,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900385 int flag, int *resid);
James Bottomleyea73a9f2005-08-28 11:33:52 -0500386extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
387 int data_direction, void *buffer, unsigned bufflen,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900388 struct scsi_sense_hdr *, int timeout, int retries,
389 int *resid);
James Bottomley33aa6872005-08-28 11:31:14 -0500390
Alan Sternbc4f2402010-06-17 10:41:42 -0400391#ifdef CONFIG_PM_RUNTIME
392extern int scsi_autopm_get_device(struct scsi_device *);
393extern void scsi_autopm_put_device(struct scsi_device *);
394#else
395static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
396static inline void scsi_autopm_put_device(struct scsi_device *d) {}
397#endif /* CONFIG_PM_RUNTIME */
398
Andrew Mortoncb5d9e02006-09-30 21:23:44 -0400399static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
James Bottomleye28482c2006-03-14 14:24:55 -0600400{
Andrew Mortoncb5d9e02006-09-30 21:23:44 -0400401 return device_reprobe(&sdev->sdev_gendev);
James Bottomleye28482c2006-03-14 14:24:55 -0600402}
403
Jeff Garzik01d7b3b2005-10-24 18:03:34 -0400404static inline unsigned int sdev_channel(struct scsi_device *sdev)
405{
406 return sdev->channel;
407}
408
409static inline unsigned int sdev_id(struct scsi_device *sdev)
410{
411 return sdev->id;
412}
413
414#define scmd_id(scmd) sdev_id((scmd)->device)
415#define scmd_channel(scmd) sdev_channel((scmd)->device)
416
James Bottomley0f1d87a2008-08-22 16:43:59 -0500417/*
418 * checks for positions of the SCSI state machine
419 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420static inline int scsi_device_online(struct scsi_device *sdev)
421{
Hannes Reinecke0762a482009-01-12 09:28:55 +0100422 return (sdev->sdev_state != SDEV_OFFLINE &&
423 sdev->sdev_state != SDEV_DEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424}
James Bottomley0f1d87a2008-08-22 16:43:59 -0500425static inline int scsi_device_blocked(struct scsi_device *sdev)
426{
James Bottomley6f4267e2008-08-22 16:53:31 -0500427 return sdev->sdev_state == SDEV_BLOCK ||
428 sdev->sdev_state == SDEV_CREATED_BLOCK;
James Bottomley0f1d87a2008-08-22 16:43:59 -0500429}
430static inline int scsi_device_created(struct scsi_device *sdev)
431{
James Bottomley6f4267e2008-08-22 16:53:31 -0500432 return sdev->sdev_state == SDEV_CREATED ||
433 sdev->sdev_state == SDEV_CREATED_BLOCK;
James Bottomley0f1d87a2008-08-22 16:43:59 -0500434}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436/* accessor functions for the SCSI parameters */
437static inline int scsi_device_sync(struct scsi_device *sdev)
438{
439 return sdev->sdtr;
440}
441static inline int scsi_device_wide(struct scsi_device *sdev)
442{
443 return sdev->wdtr;
444}
445static inline int scsi_device_dt(struct scsi_device *sdev)
446{
447 return sdev->ppr;
448}
449static inline int scsi_device_dt_only(struct scsi_device *sdev)
450{
451 if (sdev->inquiry_len < 57)
452 return 0;
453 return (sdev->inquiry[56] & 0x0c) == 0x04;
454}
455static inline int scsi_device_ius(struct scsi_device *sdev)
456{
457 if (sdev->inquiry_len < 57)
458 return 0;
459 return sdev->inquiry[56] & 0x01;
460}
461static inline int scsi_device_qas(struct scsi_device *sdev)
462{
463 if (sdev->inquiry_len < 57)
464 return 0;
465 return sdev->inquiry[56] & 0x02;
466}
James Bottomleyb30c2fc2008-01-20 09:09:40 -0600467static inline int scsi_device_enclosure(struct scsi_device *sdev)
468{
Krishnasamy, Somasundaramd1e12de2011-02-28 18:13:22 -0500469 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
James Bottomleyb30c2fc2008-01-20 09:09:40 -0600470}
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +0400471
Martin K. Petersen7027ad72008-07-17 17:08:48 -0400472static inline int scsi_device_protection(struct scsi_device *sdev)
473{
Hugh Dickinsd211f052008-08-06 18:21:18 +0100474 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
Martin K. Petersen7027ad72008-07-17 17:08:48 -0400475}
476
Hannes Reinecked7c48fe2011-08-24 10:51:13 +0200477static inline int scsi_device_tpgs(struct scsi_device *sdev)
478{
479 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
480}
481
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +0400482#define MODULE_ALIAS_SCSI_DEVICE(type) \
483 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
484#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486#endif /* _SCSI_SCSI_DEVICE_H */