LXR linux-bk/include/scsi/scsi

   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
   9struct request_queue;
  10struct scsi_cmnd;
  11struct 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 */
  19enum 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};
  34
  35struct scsi_device {
  36        struct Scsi_Host *host;
  37        struct request_queue *request_queue;
  38
  39        /* the next two are protected by the host->host_lock */
  40        struct list_head    siblings;   /* list of all devices on this host */
  41        struct list_head    same_target_siblings; /* just the devices sharing same target id */
  42
  43        volatile unsigned short device_busy;    /* commands actually active on low-level */
  44        spinlock_t sdev_lock;           /* also the request queue_lock */
  45        spinlock_t list_lock;
  46        struct list_head cmd_list;      /* queue of in use SCSI Command structures */
  47        struct list_head starved_entry;
  48        struct scsi_cmnd *current_cmnd; /* currently active command */
  49        unsigned short queue_depth;     /* How deep of a queue we want */
  50        unsigned short last_queue_full_depth; /* These two are used by */
  51        unsigned short last_queue_full_count; /* scsi_track_queue_full() */
  52        unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
  53                                           jiffie count on our counter, they
  54                                           could all be from the same event. */
  55
  56        unsigned int id, lun, channel;
  57
  58        unsigned int manufacturer;      /* Manufacturer of device, for using 
  59                                         * vendor-specific cmd's */
  60        unsigned sector_size;   /* size in bytes */
  61
  62        void *hostdata;         /* available to low-level driver */
  63        char devfs_name[256];   /* devfs junk */
  64        char type;
  65        char scsi_level;
  66        char inq_periph_qual;   /* PQ from INQUIRY data */      
  67        unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
  68        unsigned char * inquiry;        /* INQUIRY response data */
  69        char * vendor;          /* [back_compat] point into 'inquiry' ... */
  70        char * model;           /* ... after scan; point to static string */
  71        char * rev;             /* ... "nullnullnullnull" before scan */
  72        unsigned char current_tag;      /* current tag */
  73        struct scsi_target      *sdev_target;   /* used only for single_lun */
  74
  75        unsigned int    sdev_bflags; /* black/white flags as also found in
  76                                 * scsi_devinfo.[hc]. For now used only to
  77                                 * pass settings from slave_alloc to scsi
  78                                 * core. */
  79        unsigned writeable:1;
  80        unsigned removable:1;
  81        unsigned changed:1;     /* Data invalid due to media change */
  82        unsigned busy:1;        /* Used to prevent races */
  83        unsigned lockable:1;    /* Able to prevent media removal */
  84        unsigned locked:1;      /* Media removal disabled */
  85        unsigned borken:1;      /* Tell the Seagate driver to be 
  86                                 * painfully slow on this device */
  87        unsigned disconnect:1;  /* can disconnect */
  88        unsigned soft_reset:1;  /* Uses soft reset option */
  89        unsigned sdtr:1;        /* Device supports SDTR messages */
  90        unsigned wdtr:1;        /* Device supports WDTR messages */
  91        unsigned ppr:1;         /* Device supports PPR messages */
  92        unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
  93        unsigned simple_tags:1; /* simple queue tag messages are enabled */
  94        unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
  95        unsigned single_lun:1;  /* Indicates we should only allow I/O to
  96                                 * one of the luns for the device at a 
  97                                 * time. */
  98        unsigned was_reset:1;   /* There was a bus reset on the bus for 
  99                                 * this device */
 100        unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 101                                     * because we did a bus reset. */
 102        unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 103        unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 104        unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 105        unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 106        unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 107        unsigned no_start_on_add:1;     /* do not issue start on add */
 108        unsigned allow_restart:1; /* issue START_UNIT in error handler */
 109
 110        unsigned int device_blocked;    /* Device returned QUEUE_FULL. */
 111
 112        unsigned int max_device_blocked; /* what device_blocked counts down from  */
 113#define SCSI_DEFAULT_DEVICE_BLOCKED     3
 114
 115        int timeout;
 116
 117        struct device           sdev_gendev;
 118        struct class_device     sdev_classdev;
 119
 120        struct class_device     transport_classdev;
 121
 122        enum scsi_device_state sdev_state;
 123        unsigned long           transport_data[0];
 124} __attribute__((aligned(sizeof(unsigned long))));
 125#define to_scsi_device(d)       \
 126        container_of(d, struct scsi_device, sdev_gendev)
 127#define class_to_sdev(d)        \
 128        container_of(d, struct scsi_device, sdev_classdev)
 129#define transport_class_to_sdev(class_dev) \
 130        container_of(class_dev, struct scsi_device, transport_classdev)
 131
 132extern struct scsi_device *scsi_add_device(struct Scsi_Host *,
 133                uint, uint, uint);
 134extern void scsi_remove_device(struct scsi_device *);
 135extern int scsi_device_cancel(struct scsi_device *, int);
 136
 137extern int scsi_device_get(struct scsi_device *);
 138extern void scsi_device_put(struct scsi_device *);
 139extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 140                                              uint, uint, uint);
 141extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 142                                                uint, uint, uint);
 143
 144/* only exposed to implement shost_for_each_device */
 145extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 146                                                  struct scsi_device *);
 147
 148/**
 149 * shost_for_each_device  -  iterate over all devices of a host
 150 * @sdev:       iterator
 151 * @host:       host whiches devices we want to iterate over
 152 *
 153 * This traverses over each devices of @shost.  The devices have
 154 * a reference that must be released by scsi_host_put when breaking
 155 * out of the loop.
 156 */
 157#define shost_for_each_device(sdev, shost) \
 158        for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 159             (sdev); \
 160             (sdev) = __scsi_iterate_devices((shost), (sdev)))
 161
 162/**
 163 * __shost_for_each_device  -  iterate over all devices of a host (UNLOCKED)
 164 * @sdev:       iterator
 165 * @host:       host whiches devices we want to iterate over
 166 *
 167 * This traverses over each devices of @shost.  It does _not_ take a
 168 * reference on the scsi_device, thus it the whole loop must be protected
 169 * by shost->host_lock.
 170 *
 171 * Note:  The only reason why drivers would want to use this is because
 172 * they're need to access the device list in irq context.  Otherwise you
 173 * really want to use shost_for_each_device instead.
 174 */
 175#define __shost_for_each_device(sdev, shost) \
 176        list_for_each_entry((sdev), &((shost)->__devices), siblings)
 177
 178extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
 179extern int scsi_track_queue_full(struct scsi_device *, int);
 180
 181extern int scsi_set_medium_removal(struct scsi_device *, char);
 182
 183extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 184                           unsigned char *buffer, int len, int timeout,
 185                           int retries, struct scsi_mode_data *data);
 186extern int scsi_device_set_state(struct scsi_device *sdev,
 187                                 enum scsi_device_state state);
 188extern int scsi_device_quiesce(struct scsi_device *sdev);
 189extern void scsi_device_resume(struct scsi_device *sdev);
 190extern const char *scsi_device_state_name(enum scsi_device_state);
 191static int inline scsi_device_online(struct scsi_device *sdev)
 192{
 193        return sdev->sdev_state != SDEV_OFFLINE;
 194}
 195#endif /* _SCSI_SCSI_DEVICE_H */
 196