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0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _SCSI_SCSI_DEVICE_H
0003 #define _SCSI_SCSI_DEVICE_H
0004 
0005 #include <linux/list.h>
0006 #include <linux/spinlock.h>
0007 #include <linux/workqueue.h>
0008 #include <linux/blk-mq.h>
0009 #include <scsi/scsi.h>
0010 #include <linux/atomic.h>
0011 #include <linux/sbitmap.h>
0012 
0013 struct bsg_device;
0014 struct device;
0015 struct request_queue;
0016 struct scsi_cmnd;
0017 struct scsi_lun;
0018 struct scsi_sense_hdr;
0019 
0020 typedef __u64 __bitwise blist_flags_t;
0021 
0022 #define SCSI_SENSE_BUFFERSIZE   96
0023 
0024 struct scsi_mode_data {
0025     __u32   length;
0026     __u16   block_descriptor_length;
0027     __u8    medium_type;
0028     __u8    device_specific;
0029     __u8    header_length;
0030     __u8    longlba:1;
0031 };
0032 
0033 /*
0034  * sdev state: If you alter this, you also need to alter scsi_sysfs.c
0035  * (for the ascii descriptions) and the state model enforcer:
0036  * scsi_lib:scsi_device_set_state().
0037  */
0038 enum scsi_device_state {
0039     SDEV_CREATED = 1,   /* device created but not added to sysfs
0040                  * Only internal commands allowed (for inq) */
0041     SDEV_RUNNING,       /* device properly configured
0042                  * All commands allowed */
0043     SDEV_CANCEL,        /* beginning to delete device
0044                  * Only error handler commands allowed */
0045     SDEV_DEL,       /* device deleted 
0046                  * no commands allowed */
0047     SDEV_QUIESCE,       /* Device quiescent.  No block commands
0048                  * will be accepted, only specials (which
0049                  * originate in the mid-layer) */
0050     SDEV_OFFLINE,       /* Device offlined (by error handling or
0051                  * user request */
0052     SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
0053     SDEV_BLOCK,     /* Device blocked by scsi lld.  No
0054                  * scsi commands from user or midlayer
0055                  * should be issued to the scsi
0056                  * lld. */
0057     SDEV_CREATED_BLOCK, /* same as above but for created devices */
0058 };
0059 
0060 enum scsi_scan_mode {
0061     SCSI_SCAN_INITIAL = 0,
0062     SCSI_SCAN_RESCAN,
0063     SCSI_SCAN_MANUAL,
0064 };
0065 
0066 enum scsi_device_event {
0067     SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
0068     SDEV_EVT_INQUIRY_CHANGE_REPORTED,       /* 3F 03  UA reported */
0069     SDEV_EVT_CAPACITY_CHANGE_REPORTED,      /* 2A 09  UA reported */
0070     SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,   /* 38 07  UA reported */
0071     SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,    /* 2A 01  UA reported */
0072     SDEV_EVT_LUN_CHANGE_REPORTED,           /* 3F 0E  UA reported */
0073     SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,        /* 2A 06  UA reported */
0074     SDEV_EVT_POWER_ON_RESET_OCCURRED,       /* 29 00  UA reported */
0075 
0076     SDEV_EVT_FIRST      = SDEV_EVT_MEDIA_CHANGE,
0077     SDEV_EVT_LAST       = SDEV_EVT_POWER_ON_RESET_OCCURRED,
0078 
0079     SDEV_EVT_MAXBITS    = SDEV_EVT_LAST + 1
0080 };
0081 
0082 struct scsi_event {
0083     enum scsi_device_event  evt_type;
0084     struct list_head    node;
0085 
0086     /* put union of data structures, for non-simple event types,
0087      * here
0088      */
0089 };
0090 
0091 /**
0092  * struct scsi_vpd - SCSI Vital Product Data
0093  * @rcu: For kfree_rcu().
0094  * @len: Length in bytes of @data.
0095  * @data: VPD data as defined in various T10 SCSI standard documents.
0096  */
0097 struct scsi_vpd {
0098     struct rcu_head rcu;
0099     int     len;
0100     unsigned char   data[];
0101 };
0102 
0103 enum scsi_vpd_parameters {
0104     SCSI_VPD_HEADER_SIZE = 4,
0105 };
0106 
0107 struct scsi_device {
0108     struct Scsi_Host *host;
0109     struct request_queue *request_queue;
0110 
0111     /* the next two are protected by the host->host_lock */
0112     struct list_head    siblings;   /* list of all devices on this host */
0113     struct list_head    same_target_siblings; /* just the devices sharing same target id */
0114 
0115     struct sbitmap budget_map;
0116     atomic_t device_blocked;    /* Device returned QUEUE_FULL. */
0117 
0118     atomic_t restarts;
0119     spinlock_t list_lock;
0120     struct list_head starved_entry;
0121     unsigned short queue_depth; /* How deep of a queue we want */
0122     unsigned short max_queue_depth; /* max queue depth */
0123     unsigned short last_queue_full_depth; /* These two are used by */
0124     unsigned short last_queue_full_count; /* scsi_track_queue_full() */
0125     unsigned long last_queue_full_time; /* last queue full time */
0126     unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
0127 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
0128 
0129     unsigned long last_queue_ramp_up;   /* last queue ramp up time */
0130 
0131     unsigned int id, channel;
0132     u64 lun;
0133     unsigned int manufacturer;  /* Manufacturer of device, for using 
0134                      * vendor-specific cmd's */
0135     unsigned sector_size;   /* size in bytes */
0136 
0137     void *hostdata;     /* available to low-level driver */
0138     unsigned char type;
0139     char scsi_level;
0140     char inq_periph_qual;   /* PQ from INQUIRY data */  
0141     struct mutex inquiry_mutex;
0142     unsigned char inquiry_len;  /* valid bytes in 'inquiry' */
0143     unsigned char * inquiry;    /* INQUIRY response data */
0144     const char * vendor;        /* [back_compat] point into 'inquiry' ... */
0145     const char * model;     /* ... after scan; point to static string */
0146     const char * rev;       /* ... "nullnullnullnull" before scan */
0147 
0148     struct scsi_vpd __rcu *vpd_pg0;
0149     struct scsi_vpd __rcu *vpd_pg83;
0150     struct scsi_vpd __rcu *vpd_pg80;
0151     struct scsi_vpd __rcu *vpd_pg89;
0152     struct scsi_vpd __rcu *vpd_pgb0;
0153     struct scsi_vpd __rcu *vpd_pgb1;
0154     struct scsi_vpd __rcu *vpd_pgb2;
0155 
0156     struct scsi_target      *sdev_target;
0157 
0158     blist_flags_t       sdev_bflags; /* black/white flags as also found in
0159                  * scsi_devinfo.[hc]. For now used only to
0160                  * pass settings from slave_alloc to scsi
0161                  * core. */
0162     unsigned int eh_timeout; /* Error handling timeout */
0163     unsigned removable:1;
0164     unsigned changed:1; /* Data invalid due to media change */
0165     unsigned busy:1;    /* Used to prevent races */
0166     unsigned lockable:1;    /* Able to prevent media removal */
0167     unsigned locked:1;      /* Media removal disabled */
0168     unsigned borken:1;  /* Tell the Seagate driver to be 
0169                  * painfully slow on this device */
0170     unsigned disconnect:1;  /* can disconnect */
0171     unsigned soft_reset:1;  /* Uses soft reset option */
0172     unsigned sdtr:1;    /* Device supports SDTR messages */
0173     unsigned wdtr:1;    /* Device supports WDTR messages */
0174     unsigned ppr:1;     /* Device supports PPR messages */
0175     unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
0176     unsigned simple_tags:1; /* simple queue tag messages are enabled */
0177     unsigned was_reset:1;   /* There was a bus reset on the bus for 
0178                  * this device */
0179     unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
0180                      * because we did a bus reset. */
0181     unsigned use_10_for_rw:1; /* first try 10-byte read / write */
0182     unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
0183     unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
0184     unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
0185     unsigned no_write_same:1;   /* no WRITE SAME command */
0186     unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
0187     unsigned skip_ms_page_8:1;  /* do not use MODE SENSE page 0x08 */
0188     unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
0189     unsigned skip_vpd_pages:1;  /* do not read VPD pages */
0190     unsigned try_vpd_pages:1;   /* attempt to read VPD pages */
0191     unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
0192     unsigned no_start_on_add:1; /* do not issue start on add */
0193     unsigned allow_restart:1; /* issue START_UNIT in error handler */
0194     unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
0195     unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
0196     unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
0197     unsigned select_no_atn:1;
0198     unsigned fix_capacity:1;    /* READ_CAPACITY is too high by 1 */
0199     unsigned guess_capacity:1;  /* READ_CAPACITY might be too high by 1 */
0200     unsigned retry_hwerror:1;   /* Retry HARDWARE_ERROR */
0201     unsigned last_sector_bug:1; /* do not use multisector accesses on
0202                        SD_LAST_BUGGY_SECTORS */
0203     unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
0204     unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
0205     unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
0206     unsigned security_supported:1;  /* Supports Security Protocols */
0207     unsigned is_visible:1;  /* is the device visible in sysfs */
0208     unsigned wce_default_on:1;  /* Cache is ON by default */
0209     unsigned no_dif:1;  /* T10 PI (DIF) should be disabled */
0210     unsigned broken_fua:1;      /* Don't set FUA bit */
0211     unsigned lun_in_cdb:1;      /* Store LUN bits in CDB[1] */
0212     unsigned unmap_limit_for_ws:1;  /* Use the UNMAP limit for WRITE SAME */
0213     unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
0214                      * creation time */
0215     unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
0216     unsigned silence_suspend:1; /* Do not print runtime PM related messages */
0217 
0218     unsigned int queue_stopped; /* request queue is quiesced */
0219     bool offline_already;       /* Device offline message logged */
0220 
0221     atomic_t disk_events_disable_depth; /* disable depth for disk events */
0222 
0223     DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
0224     DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
0225     struct list_head event_list;    /* asserted events */
0226     struct work_struct event_work;
0227 
0228     unsigned int max_device_blocked; /* what device_blocked counts down from  */
0229 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
0230 
0231     atomic_t iorequest_cnt;
0232     atomic_t iodone_cnt;
0233     atomic_t ioerr_cnt;
0234 
0235     struct device       sdev_gendev,
0236                 sdev_dev;
0237 
0238     struct execute_work ew; /* used to get process context on put */
0239     struct work_struct  requeue_work;
0240 
0241     struct scsi_device_handler *handler;
0242     void            *handler_data;
0243 
0244     size_t          dma_drain_len;
0245     void            *dma_drain_buf;
0246 
0247     unsigned int        sg_timeout;
0248     unsigned int        sg_reserved_size;
0249 
0250     struct bsg_device   *bsg_dev;
0251     unsigned char       access_state;
0252     struct mutex        state_mutex;
0253     enum scsi_device_state sdev_state;
0254     struct task_struct  *quiesced_by;
0255     unsigned long       sdev_data[];
0256 } __attribute__((aligned(sizeof(unsigned long))));
0257 
0258 #define to_scsi_device(d)   \
0259     container_of(d, struct scsi_device, sdev_gendev)
0260 #define class_to_sdev(d)    \
0261     container_of(d, struct scsi_device, sdev_dev)
0262 #define transport_class_to_sdev(class_dev) \
0263     to_scsi_device(class_dev->parent)
0264 
0265 #define sdev_dbg(sdev, fmt, a...) \
0266     dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
0267 
0268 /*
0269  * like scmd_printk, but the device name is passed in
0270  * as a string pointer
0271  */
0272 __printf(4, 5) void
0273 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
0274         const char *, ...);
0275 
0276 #define sdev_printk(l, sdev, fmt, a...)             \
0277     sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
0278 
0279 __printf(3, 4) void
0280 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
0281 
0282 #define scmd_dbg(scmd, fmt, a...)                   \
0283     do {                                \
0284         struct request *__rq = scsi_cmd_to_rq((scmd));      \
0285                                     \
0286         if (__rq->q->disk)                  \
0287             sdev_dbg((scmd)->device, "[%s] " fmt,       \
0288                  __rq->q->disk->disk_name, ##a);    \
0289         else                            \
0290             sdev_dbg((scmd)->device, fmt, ##a);     \
0291     } while (0)
0292 
0293 enum scsi_target_state {
0294     STARGET_CREATED = 1,
0295     STARGET_RUNNING,
0296     STARGET_REMOVE,
0297     STARGET_CREATED_REMOVE,
0298     STARGET_DEL,
0299 };
0300 
0301 /*
0302  * scsi_target: representation of a scsi target, for now, this is only
0303  * used for single_lun devices. If no one has active IO to the target,
0304  * starget_sdev_user is NULL, else it points to the active sdev.
0305  */
0306 struct scsi_target {
0307     struct scsi_device  *starget_sdev_user;
0308     struct list_head    siblings;
0309     struct list_head    devices;
0310     struct device       dev;
0311     struct kref     reap_ref; /* last put renders target invisible */
0312     unsigned int        channel;
0313     unsigned int        id; /* target id ... replace
0314                      * scsi_device.id eventually */
0315     unsigned int        create:1; /* signal that it needs to be added */
0316     unsigned int        single_lun:1;   /* Indicates we should only
0317                          * allow I/O to one of the luns
0318                          * for the device at a time. */
0319     unsigned int        pdt_1f_for_no_lun:1;    /* PDT = 0x1f
0320                          * means no lun present. */
0321     unsigned int        no_report_luns:1;   /* Don't use
0322                          * REPORT LUNS for scanning. */
0323     unsigned int        expecting_lun_change:1; /* A device has reported
0324                          * a 3F/0E UA, other devices on
0325                          * the same target will also. */
0326     /* commands actually active on LLD. */
0327     atomic_t        target_busy;
0328     atomic_t        target_blocked;
0329 
0330     /*
0331      * LLDs should set this in the slave_alloc host template callout.
0332      * If set to zero then there is not limit.
0333      */
0334     unsigned int        can_queue;
0335     unsigned int        max_target_blocked;
0336 #define SCSI_DEFAULT_TARGET_BLOCKED 3
0337 
0338     char            scsi_level;
0339     enum scsi_target_state  state;
0340     void            *hostdata; /* available to low-level driver */
0341     unsigned long       starget_data[]; /* for the transport */
0342     /* starget_data must be the last element!!!! */
0343 } __attribute__((aligned(sizeof(unsigned long))));
0344 
0345 #define to_scsi_target(d)   container_of(d, struct scsi_target, dev)
0346 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
0347 {
0348     return to_scsi_target(sdev->sdev_gendev.parent);
0349 }
0350 #define transport_class_to_starget(class_dev) \
0351     to_scsi_target(class_dev->parent)
0352 
0353 #define starget_printk(prefix, starget, fmt, a...)  \
0354     dev_printk(prefix, &(starget)->dev, fmt, ##a)
0355 
0356 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
0357         uint, uint, u64, void *hostdata);
0358 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
0359                uint target, u64 lun);
0360 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
0361 extern void scsi_remove_device(struct scsi_device *);
0362 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
0363 void scsi_attach_vpd(struct scsi_device *sdev);
0364 
0365 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
0366 extern int __must_check scsi_device_get(struct scsi_device *);
0367 extern void scsi_device_put(struct scsi_device *);
0368 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
0369                           uint, uint, u64);
0370 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
0371                         uint, uint, u64);
0372 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
0373                             u64);
0374 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
0375                               u64);
0376 extern void starget_for_each_device(struct scsi_target *, void *,
0377              void (*fn)(struct scsi_device *, void *));
0378 extern void __starget_for_each_device(struct scsi_target *, void *,
0379                       void (*fn)(struct scsi_device *,
0380                          void *));
0381 
0382 /* only exposed to implement shost_for_each_device */
0383 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
0384                           struct scsi_device *);
0385 
0386 /**
0387  * shost_for_each_device - iterate over all devices of a host
0388  * @sdev: the &struct scsi_device to use as a cursor
0389  * @shost: the &struct scsi_host to iterate over
0390  *
0391  * Iterator that returns each device attached to @shost.  This loop
0392  * takes a reference on each device and releases it at the end.  If
0393  * you break out of the loop, you must call scsi_device_put(sdev).
0394  */
0395 #define shost_for_each_device(sdev, shost) \
0396     for ((sdev) = __scsi_iterate_devices((shost), NULL); \
0397          (sdev); \
0398          (sdev) = __scsi_iterate_devices((shost), (sdev)))
0399 
0400 /**
0401  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
0402  * @sdev: the &struct scsi_device to use as a cursor
0403  * @shost: the &struct scsi_host to iterate over
0404  *
0405  * Iterator that returns each device attached to @shost.  It does _not_
0406  * take a reference on the scsi_device, so the whole loop must be
0407  * protected by shost->host_lock.
0408  *
0409  * Note: The only reason to use this is because you need to access the
0410  * device list in interrupt context.  Otherwise you really want to use
0411  * shost_for_each_device instead.
0412  */
0413 #define __shost_for_each_device(sdev, shost) \
0414     list_for_each_entry((sdev), &((shost)->__devices), siblings)
0415 
0416 extern int scsi_change_queue_depth(struct scsi_device *, int);
0417 extern int scsi_track_queue_full(struct scsi_device *, int);
0418 
0419 extern int scsi_set_medium_removal(struct scsi_device *, char);
0420 
0421 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
0422                unsigned char *buffer, int len, int timeout,
0423                int retries, struct scsi_mode_data *data,
0424                struct scsi_sense_hdr *);
0425 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
0426                 unsigned char *buffer, int len, int timeout,
0427                 int retries, struct scsi_mode_data *data,
0428                 struct scsi_sense_hdr *);
0429 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
0430                 int retries, struct scsi_sense_hdr *sshdr);
0431 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
0432                  int buf_len);
0433 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
0434                   unsigned int len, unsigned char opcode);
0435 extern int scsi_device_set_state(struct scsi_device *sdev,
0436                  enum scsi_device_state state);
0437 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
0438                       gfp_t gfpflags);
0439 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
0440 extern void sdev_evt_send_simple(struct scsi_device *sdev,
0441               enum scsi_device_event evt_type, gfp_t gfpflags);
0442 extern int scsi_device_quiesce(struct scsi_device *sdev);
0443 extern void scsi_device_resume(struct scsi_device *sdev);
0444 extern void scsi_target_quiesce(struct scsi_target *);
0445 extern void scsi_target_resume(struct scsi_target *);
0446 extern void scsi_scan_target(struct device *parent, unsigned int channel,
0447                  unsigned int id, u64 lun,
0448                  enum scsi_scan_mode rescan);
0449 extern void scsi_target_reap(struct scsi_target *);
0450 extern void scsi_target_block(struct device *);
0451 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
0452 extern void scsi_remove_target(struct device *);
0453 extern const char *scsi_device_state_name(enum scsi_device_state);
0454 extern int scsi_is_sdev_device(const struct device *);
0455 extern int scsi_is_target_device(const struct device *);
0456 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
0457 extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
0458             int data_direction, void *buffer, unsigned bufflen,
0459             unsigned char *sense, struct scsi_sense_hdr *sshdr,
0460             int timeout, int retries, blk_opf_t flags,
0461             req_flags_t rq_flags, int *resid);
0462 /* Make sure any sense buffer is the correct size. */
0463 #define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \
0464              sshdr, timeout, retries, flags, rq_flags, resid)   \
0465 ({                                  \
0466     BUILD_BUG_ON((sense) != NULL &&                 \
0467              sizeof(sense) != SCSI_SENSE_BUFFERSIZE);       \
0468     __scsi_execute(sdev, cmd, data_direction, buffer, bufflen,  \
0469                sense, sshdr, timeout, retries, flags, rq_flags, \
0470                resid);                      \
0471 })
0472 static inline int scsi_execute_req(struct scsi_device *sdev,
0473     const unsigned char *cmd, int data_direction, void *buffer,
0474     unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
0475     int retries, int *resid)
0476 {
0477     return scsi_execute(sdev, cmd, data_direction, buffer,
0478         bufflen, NULL, sshdr, timeout, retries,  0, 0, resid);
0479 }
0480 extern void sdev_disable_disk_events(struct scsi_device *sdev);
0481 extern void sdev_enable_disk_events(struct scsi_device *sdev);
0482 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
0483 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
0484 
0485 #ifdef CONFIG_PM
0486 extern int scsi_autopm_get_device(struct scsi_device *);
0487 extern void scsi_autopm_put_device(struct scsi_device *);
0488 #else
0489 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
0490 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
0491 #endif /* CONFIG_PM */
0492 
0493 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
0494 {
0495     return device_reprobe(&sdev->sdev_gendev);
0496 }
0497 
0498 static inline unsigned int sdev_channel(struct scsi_device *sdev)
0499 {
0500     return sdev->channel;
0501 }
0502 
0503 static inline unsigned int sdev_id(struct scsi_device *sdev)
0504 {
0505     return sdev->id;
0506 }
0507 
0508 #define scmd_id(scmd) sdev_id((scmd)->device)
0509 #define scmd_channel(scmd) sdev_channel((scmd)->device)
0510 
0511 /*
0512  * checks for positions of the SCSI state machine
0513  */
0514 static inline int scsi_device_online(struct scsi_device *sdev)
0515 {
0516     return (sdev->sdev_state != SDEV_OFFLINE &&
0517         sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
0518         sdev->sdev_state != SDEV_DEL);
0519 }
0520 static inline int scsi_device_blocked(struct scsi_device *sdev)
0521 {
0522     return sdev->sdev_state == SDEV_BLOCK ||
0523         sdev->sdev_state == SDEV_CREATED_BLOCK;
0524 }
0525 static inline int scsi_device_created(struct scsi_device *sdev)
0526 {
0527     return sdev->sdev_state == SDEV_CREATED ||
0528         sdev->sdev_state == SDEV_CREATED_BLOCK;
0529 }
0530 
0531 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
0532 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
0533                     enum scsi_device_state new_state);
0534 
0535 /* accessor functions for the SCSI parameters */
0536 static inline int scsi_device_sync(struct scsi_device *sdev)
0537 {
0538     return sdev->sdtr;
0539 }
0540 static inline int scsi_device_wide(struct scsi_device *sdev)
0541 {
0542     return sdev->wdtr;
0543 }
0544 static inline int scsi_device_dt(struct scsi_device *sdev)
0545 {
0546     return sdev->ppr;
0547 }
0548 static inline int scsi_device_dt_only(struct scsi_device *sdev)
0549 {
0550     if (sdev->inquiry_len < 57)
0551         return 0;
0552     return (sdev->inquiry[56] & 0x0c) == 0x04;
0553 }
0554 static inline int scsi_device_ius(struct scsi_device *sdev)
0555 {
0556     if (sdev->inquiry_len < 57)
0557         return 0;
0558     return sdev->inquiry[56] & 0x01;
0559 }
0560 static inline int scsi_device_qas(struct scsi_device *sdev)
0561 {
0562     if (sdev->inquiry_len < 57)
0563         return 0;
0564     return sdev->inquiry[56] & 0x02;
0565 }
0566 static inline int scsi_device_enclosure(struct scsi_device *sdev)
0567 {
0568     return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
0569 }
0570 
0571 static inline int scsi_device_protection(struct scsi_device *sdev)
0572 {
0573     if (sdev->no_dif)
0574         return 0;
0575 
0576     return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
0577 }
0578 
0579 static inline int scsi_device_tpgs(struct scsi_device *sdev)
0580 {
0581     return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
0582 }
0583 
0584 /**
0585  * scsi_device_supports_vpd - test if a device supports VPD pages
0586  * @sdev: the &struct scsi_device to test
0587  *
0588  * If the 'try_vpd_pages' flag is set it takes precedence.
0589  * Otherwise we will assume VPD pages are supported if the
0590  * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
0591  */
0592 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
0593 {
0594     /* Attempt VPD inquiry if the device blacklist explicitly calls
0595      * for it.
0596      */
0597     if (sdev->try_vpd_pages)
0598         return 1;
0599     /*
0600      * Although VPD inquiries can go to SCSI-2 type devices,
0601      * some USB ones crash on receiving them, and the pages
0602      * we currently ask for are mandatory for SPC-2 and beyond
0603      */
0604     if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
0605         return 1;
0606     return 0;
0607 }
0608 
0609 static inline int scsi_device_busy(struct scsi_device *sdev)
0610 {
0611     return sbitmap_weight(&sdev->budget_map);
0612 }
0613 
0614 #define MODULE_ALIAS_SCSI_DEVICE(type) \
0615     MODULE_ALIAS("scsi:t-" __stringify(type) "*")
0616 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
0617 
0618 #endif /* _SCSI_SCSI_DEVICE_H */
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