drivers/scsi/st.h

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