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 }; 33 34 /* The tape buffer descriptor. */ 35 struct st_buffer { 36 unsigned char dma; /* DMA-able buffer */ 37 unsigned char do_dio; /* direct i/o set up? */ 38 unsigned char cleared; /* internal buffer cleared after open? */ 39 int buffer_size; 40 int buffer_blocks; 41 int buffer_bytes; 42 int read_pointer; 43 int writing; 44 int syscall_result; 45 struct st_request *last_SRpnt; 46 struct st_cmdstatus cmdstat; 47 unsigned char *b_data; 48 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */ 49 unsigned short sg_segs; /* number of segments in s/g list */ 50 unsigned short orig_frp_segs; /* number of segments allocated at first try */ 51 unsigned short frp_segs; /* number of buffer segments */ 52 unsigned int frp_sg_current; /* driver buffer length currently in s/g list */ 53 struct st_buf_fragment *frp; /* the allocated buffer fragment list */ 54 struct scatterlist sg[1]; /* MUST BE last item */ 55 }; 56 57 /* The tape buffer fragment descriptor */ 58 struct st_buf_fragment { 59 struct page *page; 60 unsigned int length; 61 }; 62 63 /* The tape mode definition */ 64 struct st_modedef { 65 unsigned char defined; 66 unsigned char sysv; /* SYS V semantics? */ 67 unsigned char do_async_writes; 68 unsigned char do_buffer_writes; 69 unsigned char do_read_ahead; 70 unsigned char defaults_for_writes; 71 unsigned char default_compression; /* 0 = don't touch, etc */ 72 short default_density; /* Forced density, -1 = no value */ 73 int default_blksize; /* Forced blocksize, -1 = no value */ 74 struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */ 75 }; 76 77 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum 78 number of modes is 16 (ST_NBR_MODE_BITS 4) */ 79 #define ST_NBR_MODE_BITS 2 80 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS) 81 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS) 82 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT) 83 84 #define ST_MAX_TAPES 128 85 #define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1)) 86 87 /* The status related to each partition */ 88 struct st_partstat { 89 unsigned char rw; 90 unsigned char eof; 91 unsigned char at_sm; 92 unsigned char last_block_valid; 93 u32 last_block_visited; 94 int drv_block; /* The block where the drive head is */ 95 int drv_file; 96 }; 97 98 #define ST_NBR_PARTITIONS 4 99 100 /* The tape drive descriptor */ 101 struct scsi_tape { 102 struct scsi_driver *driver; 103 struct scsi_device *device; 104 struct mutex lock; /* For serialization */ 105 struct completion wait; /* For SCSI commands */ 106 struct st_buffer *buffer; 107 108 /* Drive characteristics */ 109 unsigned char omit_blklims; 110 unsigned char do_auto_lock; 111 unsigned char can_bsr; 112 unsigned char can_partitions; 113 unsigned char two_fm; 114 unsigned char fast_mteom; 115 unsigned char immediate; 116 unsigned char restr_dma; 117 unsigned char scsi2_logical; 118 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ 119 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */ 120 unsigned char cln_sense_value; 121 unsigned char cln_sense_mask; 122 unsigned char use_pf; /* Set Page Format bit in all mode selects? */ 123 unsigned char try_dio; /* try direct i/o in general? */ 124 unsigned char try_dio_now; /* try direct i/o before next close? */ 125 unsigned char c_algo; /* compression algorithm */ 126 unsigned char pos_unknown; /* after reset position unknown */ 127 unsigned char sili; /* use SILI when reading in variable b mode */ 128 int tape_type; 129 int long_timeout; /* timeout for commands known to take long time */ 130 131 unsigned long max_pfn; /* the maximum page number reachable by the HBA */ 132 133 /* Mode characteristics */ 134 struct st_modedef modes[ST_NBR_MODES]; 135 int current_mode; 136 137 /* Status variables */ 138 int partition; 139 int new_partition; 140 int nbr_partitions; /* zero until partition support enabled */ 141 struct st_partstat ps[ST_NBR_PARTITIONS]; 142 unsigned char dirty; 143 unsigned char ready; 144 unsigned char write_prot; 145 unsigned char drv_write_prot; 146 unsigned char in_use; 147 unsigned char blksize_changed; 148 unsigned char density_changed; 149 unsigned char compression_changed; 150 unsigned char drv_buffer; 151 unsigned char density; 152 unsigned char door_locked; 153 unsigned char autorew_dev; /* auto-rewind device */ 154 unsigned char rew_at_close; /* rewind necessary at close */ 155 unsigned char inited; 156 unsigned char cleaning_req; /* cleaning requested? */ 157 int block_size; 158 int min_block; 159 int max_block; 160 int recover_count; /* From tape opening */ 161 int recover_reg; /* From last status call */ 162 163 #if DEBUG 164 unsigned char write_pending; 165 int nbr_finished; 166 int nbr_waits; 167 int nbr_requests; 168 int nbr_dio; 169 int nbr_pages; 170 unsigned char last_cmnd[6]; 171 unsigned char last_sense[16]; 172 #endif 173 struct gendisk *disk; 174 struct kref kref; 175 }; 176 177 /* Bit masks for use_pf */ 178 #define USE_PF 1 179 #define PF_TESTED 2 180 181 /* Values of eof */ 182 #define ST_NOEOF 0 183 #define ST_FM_HIT 1 184 #define ST_FM 2 185 #define ST_EOM_OK 3 186 #define ST_EOM_ERROR 4 187 #define ST_EOD_1 5 188 #define ST_EOD_2 6 189 #define ST_EOD 7 190 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => 191 return zero => ST_EOD, return ENOSPC */ 192 /* When writing: ST_EOM_OK == early warning found, write OK 193 ST_EOD_1 == allow trying new write after early warning 194 ST_EOM_ERROR == early warning found, not able to write all */ 195 196 /* Values of rw */ 197 #define ST_IDLE 0 198 #define ST_READING 1 199 #define ST_WRITING 2 200 201 /* Values of ready state */ 202 #define ST_READY 0 203 #define ST_NOT_READY 1 204 #define ST_NO_TAPE 2 205 206 /* Values for door lock state */ 207 #define ST_UNLOCKED 0 208 #define ST_LOCKED_EXPLICIT 1 209 #define ST_LOCKED_AUTO 2 210 #define ST_LOCK_FAILS 3 211 212 /* Positioning SCSI-commands for Tandberg, etc. drives */ 213 #define QFA_REQUEST_BLOCK 0x02 214 #define QFA_SEEK_BLOCK 0x0c 215 216 /* Setting the binary options */ 217 #define ST_DONT_TOUCH 0 218 #define ST_NO 1 219 #define ST_YES 2 220 221 #define EXTENDED_SENSE_START 18 222 223 /* Masks for some conditions in the sense data */ 224 #define SENSE_FMK 0x80 225 #define SENSE_EOM 0x40 226 #define SENSE_ILI 0x20 227 228 #endif 229