linux/drivers/scsi/st.h
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   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 */
  11struct 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
  23struct scsi_tape;
  24
  25/* scsi tape command */
  26struct 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. */
  36struct st_buffer {
  37        unsigned char dma;      /* DMA-able buffer */
  38        unsigned char cleared;  /* internal buffer cleared after open? */
  39        unsigned short do_dio;  /* direct i/o set up? */
  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 */
  59struct 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 scsi_tape *tape;
  70        struct device *devs[2];  /* Auto-rewind and non-rewind devices */
  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 (1 << (20 - (ST_NBR_MODE_BITS + 1)))
  82#define ST_MAX_TAPE_ENTRIES  (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
  83
  84/* The status related to each partition */
  85struct 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 */
  98struct scsi_tape {
  99        struct scsi_driver *driver;
 100        struct scsi_device *device;
 101        struct mutex lock;      /* For serialization */
 102        struct completion wait; /* For SCSI commands */
 103        struct st_buffer *buffer;
 104        int index;
 105
 106        /* Drive characteristics */
 107        unsigned char omit_blklims;
 108        unsigned char do_auto_lock;
 109        unsigned char can_bsr;
 110        unsigned char can_partitions;
 111        unsigned char two_fm;
 112        unsigned char fast_mteom;
 113        unsigned char immediate;
 114        unsigned char restr_dma;
 115        unsigned char scsi2_logical;
 116        unsigned char default_drvbuffer;        /* 0xff = don't touch, value 3 bits */
 117        unsigned char cln_mode;                 /* 0 = none, otherwise sense byte nbr */
 118        unsigned char cln_sense_value;
 119        unsigned char cln_sense_mask;
 120        unsigned char use_pf;                   /* Set Page Format bit in all mode selects? */
 121        unsigned char try_dio;                  /* try direct i/o in general? */
 122        unsigned char try_dio_now;              /* try direct i/o before next close? */
 123        unsigned char c_algo;                   /* compression algorithm */
 124        unsigned char pos_unknown;                      /* after reset position unknown */
 125        unsigned char sili;                     /* use SILI when reading in variable b mode */
 126        unsigned char immediate_filemark;       /* write filemark immediately */
 127        int tape_type;
 128        int long_timeout;       /* timeout for commands known to take long time */
 129
 130        unsigned long max_pfn;  /* the maximum page number reachable by the HBA */
 131
 132        /* Mode characteristics */
 133        struct st_modedef modes[ST_NBR_MODES];
 134        int current_mode;
 135
 136        /* Status variables */
 137        int partition;
 138        int new_partition;
 139        int nbr_partitions;     /* zero until partition support enabled */
 140        struct st_partstat ps[ST_NBR_PARTITIONS];
 141        unsigned char dirty;
 142        unsigned char ready;
 143        unsigned char write_prot;
 144        unsigned char drv_write_prot;
 145        unsigned char in_use;
 146        unsigned char blksize_changed;
 147        unsigned char density_changed;
 148        unsigned char compression_changed;
 149        unsigned char drv_buffer;
 150        unsigned char density;
 151        unsigned char door_locked;
 152        unsigned char autorew_dev;   /* auto-rewind device */
 153        unsigned char rew_at_close;  /* rewind necessary at close */
 154        unsigned char inited;
 155        unsigned char cleaning_req;  /* cleaning requested? */
 156        int block_size;
 157        int min_block;
 158        int max_block;
 159        int recover_count;     /* From tape opening */
 160        int recover_reg;       /* From last status call */
 161
 162#if DEBUG
 163        unsigned char write_pending;
 164        int nbr_finished;
 165        int nbr_waits;
 166        int nbr_requests;
 167        int nbr_dio;
 168        int nbr_pages;
 169        unsigned char last_cmnd[6];
 170        unsigned char last_sense[16];
 171#endif
 172        struct gendisk *disk;
 173        struct kref     kref;
 174};
 175
 176/* Bit masks for use_pf */
 177#define USE_PF      1
 178#define PF_TESTED   2
 179
 180/* Values of eof */
 181#define ST_NOEOF        0
 182#define ST_FM_HIT       1
 183#define ST_FM           2
 184#define ST_EOM_OK       3
 185#define ST_EOM_ERROR    4
 186#define ST_EOD_1        5
 187#define ST_EOD_2        6
 188#define ST_EOD          7
 189/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
 190   return zero => ST_EOD, return ENOSPC */
 191/* When writing: ST_EOM_OK == early warning found, write OK
 192                 ST_EOD_1  == allow trying new write after early warning
 193                 ST_EOM_ERROR == early warning found, not able to write all */
 194
 195/* Values of rw */
 196#define ST_IDLE         0
 197#define ST_READING      1
 198#define ST_WRITING      2
 199
 200/* Values of ready state */
 201#define ST_READY        0
 202#define ST_NOT_READY    1
 203#define ST_NO_TAPE      2
 204
 205/* Values for door lock state */
 206#define ST_UNLOCKED     0
 207#define ST_LOCKED_EXPLICIT 1
 208#define ST_LOCKED_AUTO  2
 209#define ST_LOCK_FAILS   3
 210
 211/* Positioning SCSI-commands for Tandberg, etc. drives */
 212#define QFA_REQUEST_BLOCK       0x02
 213#define QFA_SEEK_BLOCK          0x0c
 214
 215/* Setting the binary options */
 216#define ST_DONT_TOUCH  0
 217#define ST_NO          1
 218#define ST_YES         2
 219
 220#define EXTENDED_SENSE_START  18
 221
 222/* Masks for some conditions in the sense data */
 223#define SENSE_FMK   0x80
 224#define SENSE_EOM   0x40
 225#define SENSE_ILI   0x20
 226
 227#endif
 228
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