drivers/scsi/st.h

   1
   2 #ifndef _ST_H
   3 #define _ST_H
   4
   5 #include <linux/completion.h>
   6 #include <linux/kref.h>
   7 #include <scsi/scsi_cmnd.h>
   8
   9 /* Descriptor for analyzed sense data */
  10 struct st_cmdstatus {
  11         int midlevel_result;
  12         struct scsi_sense_hdr sense_hdr;
  13         int have_sense;
  14         u64 uremainder64;
  15         u8 flags;
  16         u8 remainder_valid;
  17         u8 fixed_format;
  18         u8 deferred;
  19 };
  20
  21 struct scsi_tape;
  22
  23 /* scsi tape command */
  24 struct st_request {
  25         unsigned char cmd[MAX_COMMAND_SIZE];
  26         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
  27         int result;
  28         struct scsi_tape *stp;
  29         struct completion *waiting;
  30 };
  31
  32 /* The tape buffer descriptor. */
  33 struct st_buffer {
  34         unsigned char dma;      /* DMA-able buffer */
  35         unsigned char do_dio;   /* direct i/o set up? */
  36         int buffer_size;
  37         int buffer_blocks;
  38         int buffer_bytes;
  39         int read_pointer;
  40         int writing;
  41         int syscall_result;
  42         struct st_request *last_SRpnt;
  43         struct st_cmdstatus cmdstat;
  44         unsigned char *b_data;
  45         unsigned short use_sg;  /* zero or max number of s/g segments for this adapter */
  46         unsigned short sg_segs;         /* number of segments in s/g list */
  47         unsigned short orig_frp_segs;   /* number of segments allocated at first try */
  48         unsigned short frp_segs;        /* number of buffer segments */
  49         unsigned int frp_sg_current;    /* driver buffer length currently in s/g list */
  50         struct st_buf_fragment *frp;    /* the allocated buffer fragment list */
  51         struct scatterlist sg[1];       /* MUST BE last item */
  52 };
  53
  54 /* The tape buffer fragment descriptor */
  55 struct st_buf_fragment {
  56         struct page *page;
  57         unsigned int length;
  58 };
  59
  60 /* The tape mode definition */
  61 struct st_modedef {
  62         unsigned char defined;
  63         unsigned char sysv;     /* SYS V semantics? */
  64         unsigned char do_async_writes;
  65         unsigned char do_buffer_writes;
  66         unsigned char do_read_ahead;
  67         unsigned char defaults_for_writes;
  68         unsigned char default_compression;      /* 0 = don't touch, etc */
  69         short default_density;  /* Forced density, -1 = no value */
  70         int default_blksize;    /* Forced blocksize, -1 = no value */
  71         struct cdev *cdevs[2];  /* Auto-rewind and non-rewind devices */
  72 };
  73
  74 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
  75    number of modes is 16 (ST_NBR_MODE_BITS 4) */
  76 #define ST_NBR_MODE_BITS 2
  77 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
  78 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
  79 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
  80
  81 #define ST_MAX_TAPES 128
  82 #define ST_MAX_TAPE_ENTRIES  (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
  83
  84 /* The status related to each partition */
  85 struct st_partstat {
  86         unsigned char rw;
  87         unsigned char eof;
  88         unsigned char at_sm;
  89         unsigned char last_block_valid;
  90         u32 last_block_visited;
  91         int drv_block;          /* The block where the drive head is */
  92         int drv_file;
  93 };
  94
  95 #define ST_NBR_PARTITIONS 4
  96
  97 /* The tape drive descriptor */
  98 struct scsi_tape {
  99         struct scsi_driver *driver;
 100         struct scsi_device *device;
 101         struct semaphore lock;  /* For serialization */
 102         struct completion wait; /* For SCSI commands */
 103         struct st_buffer *buffer;
 104
 105         /* Drive characteristics */
 106         unsigned char omit_blklims;
 107         unsigned char do_auto_lock;
 108         unsigned char can_bsr;
 109         unsigned char can_partitions;
 110         unsigned char two_fm;
 111         unsigned char fast_mteom;
 112         unsigned char immediate;
 113         unsigned char restr_dma;
 114         unsigned char scsi2_logical;
 115         unsigned char default_drvbuffer;        /* 0xff = don't touch, value 3 bits */
 116         unsigned char cln_mode;                 /* 0 = none, otherwise sense byte nbr */
 117         unsigned char cln_sense_value;
 118         unsigned char cln_sense_mask;
 119         unsigned char use_pf;                   /* Set Page Format bit in all mode selects? */
 120         unsigned char try_dio;                  /* try direct i/o in general? */
 121         unsigned char try_dio_now;              /* try direct i/o before next close? */
 122         unsigned char c_algo;                   /* compression algorithm */
 123         unsigned char pos_unknown;                      /* after reset position unknown */
 124         int tape_type;
 125         int long_timeout;       /* timeout for commands known to take long time */
 126
 127         unsigned long max_pfn;  /* the maximum page number reachable by the HBA */
 128
 129         /* Mode characteristics */
 130         struct st_modedef modes[ST_NBR_MODES];
 131         int current_mode;
 132
 133         /* Status variables */
 134         int partition;
 135         int new_partition;
 136         int nbr_partitions;     /* zero until partition support enabled */
 137         struct st_partstat ps[ST_NBR_PARTITIONS];
 138         unsigned char dirty;
 139         unsigned char ready;
 140         unsigned char write_prot;
 141         unsigned char drv_write_prot;
 142         unsigned char in_use;
 143         unsigned char blksize_changed;
 144         unsigned char density_changed;
 145         unsigned char compression_changed;
 146         unsigned char drv_buffer;
 147         unsigned char density;
 148         unsigned char door_locked;
 149         unsigned char autorew_dev;   /* auto-rewind device */
 150         unsigned char rew_at_close;  /* rewind necessary at close */
 151         unsigned char inited;
 152         unsigned char cleaning_req;  /* cleaning requested? */
 153         int block_size;
 154         int min_block;
 155         int max_block;
 156         int recover_count;     /* From tape opening */
 157         int recover_reg;       /* From last status call */
 158
 159 #if DEBUG
 160         unsigned char write_pending;
 161         int nbr_finished;
 162         int nbr_waits;
 163         int nbr_requests;
 164         int nbr_dio;
 165         int nbr_pages;
 166         int nbr_combinable;
 167         unsigned char last_cmnd[6];
 168         unsigned char last_sense[16];
 169 #endif
 170         struct gendisk *disk;
 171         struct kref     kref;
 172 };
 173
 174 /* Bit masks for use_pf */
 175 #define USE_PF      1
 176 #define PF_TESTED   2
 177
 178 /* Values of eof */
 179 #define ST_NOEOF        0
 180 #define ST_FM_HIT       1
 181 #define ST_FM           2
 182 #define ST_EOM_OK       3
 183 #define ST_EOM_ERROR    4
 184 #define ST_EOD_1        5
 185 #define ST_EOD_2        6
 186 #define ST_EOD          7
 187 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
 188    return zero => ST_EOD, return ENOSPC */
 189 /* When writing: ST_EOM_OK == early warning found, write OK
 190                  ST_EOD_1  == allow trying new write after early warning
 191                  ST_EOM_ERROR == early warning found, not able to write all */
 192
 193 /* Values of rw */
 194 #define ST_IDLE         0
 195 #define ST_READING      1
 196 #define ST_WRITING      2
 197
 198 /* Values of ready state */
 199 #define ST_READY        0
 200 #define ST_NOT_READY    1
 201 #define ST_NO_TAPE      2
 202
 203 /* Values for door lock state */
 204 #define ST_UNLOCKED     0
 205 #define ST_LOCKED_EXPLICIT 1
 206 #define ST_LOCKED_AUTO  2
 207 #define ST_LOCK_FAILS   3
 208
 209 /* Positioning SCSI-commands for Tandberg, etc. drives */
 210 #define QFA_REQUEST_BLOCK       0x02
 211 #define QFA_SEEK_BLOCK          0x0c
 212
 213 /* Setting the binary options */
 214 #define ST_DONT_TOUCH  0
 215 #define ST_NO          1
 216 #define ST_YES         2
 217
 218 #define EXTENDED_SENSE_START  18
 219
 220 /* Masks for some conditions in the sense data */
 221 #define SENSE_FMK   0x80
 222 #define SENSE_EOM   0x40
 223 #define SENSE_ILI   0x20
 224
 225 #endif