drivers/scsi/st.h

   1
   2 #ifndef _ST_H
   3 #define _ST_H
   4
   5 #include <linux/completion.h>
   6 #include <linux/mutex.h>
   7 #include <linux/kref.h>
   8 #include <scsi/scsi_cmnd.h>
   9
  10 /* Descriptor for analyzed sense data */
  11 struct st_cmdstatus {
  12         int midlevel_result;
  13         struct scsi_sense_hdr sense_hdr;
  14         int have_sense;
  15         int residual;
  16         u64 uremainder64;
  17         u8 flags;
  18         u8 remainder_valid;
  19         u8 fixed_format;
  20         u8 deferred;
  21 };
  22
  23 struct scsi_tape;
  24
  25 /* scsi tape command */
  26 struct st_request {
  27         unsigned char cmd[MAX_COMMAND_SIZE];
  28         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
  29         int result;
  30         struct scsi_tape *stp;
  31         struct completion *waiting;
  32         struct bio *bio;
  33 };
  34
  35 /* The tape buffer descriptor. */
  36 struct st_buffer {
  37         unsigned char dma;      /* DMA-able buffer */
  38         unsigned char do_dio;   /* direct i/o set up? */
  39         unsigned char cleared;  /* internal buffer cleared after open? */
  40         int buffer_size;
  41         int buffer_blocks;
  42         int buffer_bytes;
  43         int read_pointer;
  44         int writing;
  45         int syscall_result;
  46         struct st_request *last_SRpnt;
  47         struct st_cmdstatus cmdstat;
  48         struct page **reserved_pages;
  49         int reserved_page_order;
  50         struct page **mapped_pages;
  51         struct rq_map_data map_data;
  52         unsigned char *b_data;
  53         unsigned short use_sg;  /* zero or max number of s/g segments for this adapter */
  54         unsigned short sg_segs;         /* number of segments in s/g list */
  55         unsigned short frp_segs;        /* number of buffer segments */
  56 };
  57
  58 /* The tape mode definition */
  59 struct st_modedef {
  60         unsigned char defined;
  61         unsigned char sysv;     /* SYS V semantics? */
  62         unsigned char do_async_writes;
  63         unsigned char do_buffer_writes;
  64         unsigned char do_read_ahead;
  65         unsigned char defaults_for_writes;
  66         unsigned char default_compression;      /* 0 = don't touch, etc */
  67         short default_density;  /* Forced density, -1 = no value */
  68         int default_blksize;    /* Forced blocksize, -1 = no value */
  69         struct cdev *cdevs[2];  /* Auto-rewind and non-rewind devices */
  70 };
  71
  72 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
  73    number of modes is 16 (ST_NBR_MODE_BITS 4) */
  74 #define ST_NBR_MODE_BITS 2
  75 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
  76 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
  77 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
  78
  79 #define ST_MAX_TAPES 128
  80 #define ST_MAX_TAPE_ENTRIES  (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
  81
  82 /* The status related to each partition */
  83 struct st_partstat {
  84         unsigned char rw;
  85         unsigned char eof;
  86         unsigned char at_sm;
  87         unsigned char last_block_valid;
  88         u32 last_block_visited;
  89         int drv_block;          /* The block where the drive head is */
  90         int drv_file;
  91 };
  92
  93 #define ST_NBR_PARTITIONS 4
  94
  95 /* The tape drive descriptor */
  96 struct scsi_tape {
  97         struct scsi_driver *driver;
  98         struct scsi_device *device;
  99         struct mutex lock;      /* For serialization */
 100         struct completion wait; /* For SCSI commands */
 101         struct st_buffer *buffer;
 102
 103         /* Drive characteristics */
 104         unsigned char omit_blklims;
 105         unsigned char do_auto_lock;
 106         unsigned char can_bsr;
 107         unsigned char can_partitions;
 108         unsigned char two_fm;
 109         unsigned char fast_mteom;
 110         unsigned char immediate;
 111         unsigned char restr_dma;
 112         unsigned char scsi2_logical;
 113         unsigned char default_drvbuffer;        /* 0xff = don't touch, value 3 bits */
 114         unsigned char cln_mode;                 /* 0 = none, otherwise sense byte nbr */
 115         unsigned char cln_sense_value;
 116         unsigned char cln_sense_mask;
 117         unsigned char use_pf;                   /* Set Page Format bit in all mode selects? */
 118         unsigned char try_dio;                  /* try direct i/o in general? */
 119         unsigned char try_dio_now;              /* try direct i/o before next close? */
 120         unsigned char c_algo;                   /* compression algorithm */
 121         unsigned char pos_unknown;                      /* after reset position unknown */
 122         unsigned char sili;                     /* use SILI when reading in variable b mode */
 123         int tape_type;
 124         int long_timeout;       /* timeout for commands known to take long time */
 125
 126         unsigned long max_pfn;  /* the maximum page number reachable by the HBA */
 127
 128         /* Mode characteristics */
 129         struct st_modedef modes[ST_NBR_MODES];
 130         int current_mode;
 131
 132         /* Status variables */
 133         int partition;
 134         int new_partition;
 135         int nbr_partitions;     /* zero until partition support enabled */
 136         struct st_partstat ps[ST_NBR_PARTITIONS];
 137         unsigned char dirty;
 138         unsigned char ready;
 139         unsigned char write_prot;
 140         unsigned char drv_write_prot;
 141         unsigned char in_use;
 142         unsigned char blksize_changed;
 143         unsigned char density_changed;
 144         unsigned char compression_changed;
 145         unsigned char drv_buffer;
 146         unsigned char density;
 147         unsigned char door_locked;
 148         unsigned char autorew_dev;   /* auto-rewind device */
 149         unsigned char rew_at_close;  /* rewind necessary at close */
 150         unsigned char inited;
 151         unsigned char cleaning_req;  /* cleaning requested? */
 152         int block_size;
 153         int min_block;
 154         int max_block;
 155         int recover_count;     /* From tape opening */
 156         int recover_reg;       /* From last status call */
 157
 158 #if DEBUG
 159         unsigned char write_pending;
 160         int nbr_finished;
 161         int nbr_waits;
 162         int nbr_requests;
 163         int nbr_dio;
 164         int nbr_pages;
 165         unsigned char last_cmnd[6];
 166         unsigned char last_sense[16];
 167 #endif
 168         struct gendisk *disk;
 169         struct kref     kref;
 170 };
 171
 172 /* Bit masks for use_pf */
 173 #define USE_PF      1
 174 #define PF_TESTED   2
 175
 176 /* Values of eof */
 177 #define ST_NOEOF        0
 178 #define ST_FM_HIT       1
 179 #define ST_FM           2
 180 #define ST_EOM_OK       3
 181 #define ST_EOM_ERROR    4
 182 #define ST_EOD_1        5
 183 #define ST_EOD_2        6
 184 #define ST_EOD          7
 185 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
 186    return zero => ST_EOD, return ENOSPC */
 187 /* When writing: ST_EOM_OK == early warning found, write OK
 188                  ST_EOD_1  == allow trying new write after early warning
 189                  ST_EOM_ERROR == early warning found, not able to write all */
 190
 191 /* Values of rw */
 192 #define ST_IDLE         0
 193 #define ST_READING      1
 194 #define ST_WRITING      2
 195
 196 /* Values of ready state */
 197 #define ST_READY        0
 198 #define ST_NOT_READY    1
 199 #define ST_NO_TAPE      2
 200
 201 /* Values for door lock state */
 202 #define ST_UNLOCKED     0
 203 #define ST_LOCKED_EXPLICIT 1
 204 #define ST_LOCKED_AUTO  2
 205 #define ST_LOCK_FAILS   3
 206
 207 /* Positioning SCSI-commands for Tandberg, etc. drives */
 208 #define QFA_REQUEST_BLOCK       0x02
 209 #define QFA_SEEK_BLOCK          0x0c
 210
 211 /* Setting the binary options */
 212 #define ST_DONT_TOUCH  0
 213 #define ST_NO          1
 214 #define ST_YES         2
 215
 216 #define EXTENDED_SENSE_START  18
 217
 218 /* Masks for some conditions in the sense data */
 219 #define SENSE_FMK   0x80
 220 #define SENSE_EOM   0x40
 221 #define SENSE_ILI   0x20
 222
 223 #endif