include/scsi/scsi_device.h

   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 <linux/workqueue.h>
   8 #include <asm/atomic.h>
   9
  10 struct request_queue;
  11 struct scsi_cmnd;
  12 struct scsi_lun;
  13 struct scsi_sense_hdr;
  14
  15 struct scsi_mode_data {
  16         __u32   length;
  17         __u16   block_descriptor_length;
  18         __u8    medium_type;
  19         __u8    device_specific;
  20         __u8    header_length;
  21         __u8    longlba:1;
  22 };
  23
  24 /*
  25  * sdev state: If you alter this, you also need to alter scsi_sysfs.c
  26  * (for the ascii descriptions) and the state model enforcer:
  27  * scsi_lib:scsi_device_set_state().
  28  */
  29 enum scsi_device_state {
  30         SDEV_CREATED = 1,       /* device created but not added to sysfs
  31                                  * Only internal commands allowed (for inq) */
  32         SDEV_RUNNING,           /* device properly configured
  33                                  * All commands allowed */
  34         SDEV_CANCEL,            /* beginning to delete device
  35                                  * Only error handler commands allowed */
  36         SDEV_DEL,               /* device deleted
  37                                  * no commands allowed */
  38         SDEV_QUIESCE,           /* Device quiescent.  No block commands
  39                                  * will be accepted, only specials (which
  40                                  * originate in the mid-layer) */
  41         SDEV_OFFLINE,           /* Device offlined (by error handling or
  42                                  * user request */
  43         SDEV_BLOCK,             /* Device blocked by scsi lld.  No scsi
  44                                  * commands from user or midlayer should be issued
  45                                  * to the scsi lld. */
  46 };
  47
  48 struct scsi_device {
  49         struct Scsi_Host *host;
  50         struct request_queue *request_queue;
  51
  52         /* the next two are protected by the host->host_lock */
  53         struct list_head    siblings;   /* list of all devices on this host */
  54         struct list_head    same_target_siblings; /* just the devices sharing same target id */
  55
  56         /* this is now protected by the request_queue->queue_lock */
  57         unsigned int device_busy;       /* commands actually active on
  58                                          * low-level. protected by queue_lock. */
  59         spinlock_t list_lock;
  60         struct list_head cmd_list;      /* queue of in use SCSI Command structures */
  61         struct list_head starved_entry;
  62         struct scsi_cmnd *current_cmnd; /* currently active command */
  63         unsigned short queue_depth;     /* How deep of a queue we want */
  64         unsigned short last_queue_full_depth; /* These two are used by */
  65         unsigned short last_queue_full_count; /* scsi_track_queue_full() */
  66         unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
  67                                            jiffie count on our counter, they
  68                                            could all be from the same event. */
  69
  70         unsigned int id, lun, channel;
  71
  72         unsigned int manufacturer;      /* Manufacturer of device, for using
  73                                          * vendor-specific cmd's */
  74         unsigned sector_size;   /* size in bytes */
  75
  76         void *hostdata;         /* available to low-level driver */
  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 */
  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 */
  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         struct execute_work     ew; /* used to get process context on put */
 142
 143         enum scsi_device_state sdev_state;
 144         unsigned long           sdev_data[0];
 145 } __attribute__((aligned(sizeof(unsigned long))));
 146 #define to_scsi_device(d)       \
 147         container_of(d, struct scsi_device, sdev_gendev)
 148 #define class_to_sdev(d)        \
 149         container_of(d, struct scsi_device, sdev_classdev)
 150 #define transport_class_to_sdev(class_dev) \
 151         to_scsi_device(class_dev->dev)
 152
 153 #define sdev_printk(prefix, sdev, fmt, a...)    \
 154         dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
 155
 156 #define scmd_printk(prefix, scmd, fmt, a...)    \
 157         dev_printk(prefix, &(scmd)->device->sdev_gendev, fmt, ##a)
 158
 159 enum scsi_target_state {
 160         STARGET_RUNNING = 1,
 161         STARGET_DEL,
 162 };
 163
 164 /*
 165  * scsi_target: representation of a scsi target, for now, this is only
 166  * used for single_lun devices. If no one has active IO to the target,
 167  * starget_sdev_user is NULL, else it points to the active sdev.
 168  */
 169 struct scsi_target {
 170         struct scsi_device      *starget_sdev_user;
 171         struct list_head        siblings;
 172         struct list_head        devices;
 173         struct device           dev;
 174         unsigned int            reap_ref; /* protected by the host lock */
 175         unsigned int            channel;
 176         unsigned int            id; /* target id ... replace
 177                                      * scsi_device.id eventually */
 178         unsigned int            create:1; /* signal that it needs to be added */
 179         unsigned int            pdt_1f_for_no_lun;      /* PDT = 0x1f */
 180                                                 /* means no lun present */
 181
 182         char                    scsi_level;
 183         struct execute_work     ew;
 184         enum scsi_target_state  state;
 185         void                    *hostdata; /* available to low-level driver */
 186         unsigned long           starget_data[0]; /* for the transport */
 187         /* starget_data must be the last element!!!! */
 188 } __attribute__((aligned(sizeof(unsigned long))));
 189
 190 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 191 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 192 {
 193         return to_scsi_target(sdev->sdev_gendev.parent);
 194 }
 195 #define transport_class_to_starget(class_dev) \
 196         to_scsi_target(class_dev->dev)
 197
 198 #define starget_printk(prefix, starget, fmt, a...)      \
 199         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 200
 201 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 202                 uint, uint, uint, void *hostdata);
 203 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 204                            uint target, uint lun);
 205 extern void scsi_remove_device(struct scsi_device *);
 206 extern int scsi_device_cancel(struct scsi_device *, int);
 207
 208 extern int scsi_device_get(struct scsi_device *);
 209 extern void scsi_device_put(struct scsi_device *);
 210 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 211                                               uint, uint, uint);
 212 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 213                                                 uint, uint, uint);
 214 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 215                                                         uint);
 216 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 217                                                           uint);
 218 extern void starget_for_each_device(struct scsi_target *, void *,
 219                      void (*fn)(struct scsi_device *, void *));
 220
 221 /* only exposed to implement shost_for_each_device */
 222 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 223                                                   struct scsi_device *);
 224
 225 /**
 226  * shost_for_each_device  -  iterate over all devices of a host
 227  * @sdev:       iterator
 228  * @host:       host whiches devices we want to iterate over
 229  *
 230  * This traverses over each devices of @shost.  The devices have
 231  * a reference that must be released by scsi_host_put when breaking
 232  * out of the loop.
 233  */
 234 #define shost_for_each_device(sdev, shost) \
 235         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 236              (sdev); \
 237              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 238
 239 /**
 240  * __shost_for_each_device  -  iterate over all devices of a host (UNLOCKED)
 241  * @sdev:       iterator
 242  * @host:       host whiches devices we want to iterate over
 243  *
 244  * This traverses over each devices of @shost.  It does _not_ take a
 245  * reference on the scsi_device, thus it the whole loop must be protected
 246  * by shost->host_lock.
 247  *
 248  * Note:  The only reason why drivers would want to use this is because
 249  * they're need to access the device list in irq context.  Otherwise you
 250  * really want to use shost_for_each_device instead.
 251  */
 252 #define __shost_for_each_device(sdev, shost) \
 253         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 254
 255 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
 256 extern int scsi_track_queue_full(struct scsi_device *, int);
 257
 258 extern int scsi_set_medium_removal(struct scsi_device *, char);
 259
 260 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 261                            unsigned char *buffer, int len, int timeout,
 262                            int retries, struct scsi_mode_data *data,
 263                            struct scsi_sense_hdr *);
 264 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 265                             int modepage, unsigned char *buffer, int len,
 266                             int timeout, int retries,
 267                             struct scsi_mode_data *data,
 268                             struct scsi_sense_hdr *);
 269 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 270                                 int retries);
 271 extern int scsi_device_set_state(struct scsi_device *sdev,
 272                                  enum scsi_device_state state);
 273 extern int scsi_device_quiesce(struct scsi_device *sdev);
 274 extern void scsi_device_resume(struct scsi_device *sdev);
 275 extern void scsi_target_quiesce(struct scsi_target *);
 276 extern void scsi_target_resume(struct scsi_target *);
 277 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 278                              unsigned int id, unsigned int lun, int rescan);
 279 extern void scsi_target_reap(struct scsi_target *);
 280 extern void scsi_target_block(struct device *);
 281 extern void scsi_target_unblock(struct device *);
 282 extern void scsi_remove_target(struct device *);
 283 extern void int_to_scsilun(unsigned int, struct scsi_lun *);
 284 extern const char *scsi_device_state_name(enum scsi_device_state);
 285 extern int scsi_is_sdev_device(const struct device *);
 286 extern int scsi_is_target_device(const struct device *);
 287 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 288                         int data_direction, void *buffer, unsigned bufflen,
 289                         unsigned char *sense, int timeout, int retries,
 290                         int flag);
 291 extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
 292                             int data_direction, void *buffer, unsigned bufflen,
 293                             struct scsi_sense_hdr *, int timeout, int retries);
 294 extern int scsi_execute_async(struct scsi_device *sdev,
 295                               const unsigned char *cmd, int cmd_len, int data_direction,
 296                               void *buffer, unsigned bufflen, int use_sg,
 297                               int timeout, int retries, void *privdata,
 298                               void (*done)(void *, char *, int, int),
 299                               gfp_t gfp);
 300
 301 static inline void scsi_device_reprobe(struct scsi_device *sdev)
 302 {
 303         device_reprobe(&sdev->sdev_gendev);
 304 }
 305
 306 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 307 {
 308         return sdev->channel;
 309 }
 310
 311 static inline unsigned int sdev_id(struct scsi_device *sdev)
 312 {
 313         return sdev->id;
 314 }
 315
 316 #define scmd_id(scmd) sdev_id((scmd)->device)
 317 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 318
 319 static inline int scsi_device_online(struct scsi_device *sdev)
 320 {
 321         return sdev->sdev_state != SDEV_OFFLINE;
 322 }
 323
 324 /* accessor functions for the SCSI parameters */
 325 static inline int scsi_device_sync(struct scsi_device *sdev)
 326 {
 327         return sdev->sdtr;
 328 }
 329 static inline int scsi_device_wide(struct scsi_device *sdev)
 330 {
 331         return sdev->wdtr;
 332 }
 333 static inline int scsi_device_dt(struct scsi_device *sdev)
 334 {
 335         return sdev->ppr;
 336 }
 337 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 338 {
 339         if (sdev->inquiry_len < 57)
 340                 return 0;
 341         return (sdev->inquiry[56] & 0x0c) == 0x04;
 342 }
 343 static inline int scsi_device_ius(struct scsi_device *sdev)
 344 {
 345         if (sdev->inquiry_len < 57)
 346                 return 0;
 347         return sdev->inquiry[56] & 0x01;
 348 }
 349 static inline int scsi_device_qas(struct scsi_device *sdev)
 350 {
 351         if (sdev->inquiry_len < 57)
 352                 return 0;
 353         return sdev->inquiry[56] & 0x02;
 354 }
 355 #endif /* _SCSI_SCSI_DEVICE_H */