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? */ 121 unsigned char c_algo; /* compression algorithm */ 122 unsigned char pos_unknown; /* after reset position unknown */ 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 int nbr_combinable; 166 unsigned char last_cmnd[6]; 167 unsigned char last_sense[16]; 168 #endif 169 struct gendisk *disk; 170 struct kref kref; 171 }; 172 173 /* Bit masks for use_pf */ 174 #define USE_PF 1 175 #define PF_TESTED 2 176 177 /* Values of eof */ 178 #define ST_NOEOF 0 179 #define ST_FM_HIT 1 180 #define ST_FM 2 181 #define ST_EOM_OK 3 182 #define ST_EOM_ERROR 4 183 #define ST_EOD_1 5 184 #define ST_EOD_2 6 185 #define ST_EOD 7 186 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => 187 return zero => ST_EOD, return ENOSPC */ 188 /* When writing: ST_EOM_OK == early warning found, write OK 189 ST_EOD_1 == allow trying new write after early warning 190 ST_EOM_ERROR == early warning found, not able to write all */ 191 192 /* Values of rw */ 193 #define ST_IDLE 0 194 #define ST_READING 1 195 #define ST_WRITING 2 196 197 /* Values of ready state */ 198 #define ST_READY 0 199 #define ST_NOT_READY 1 200 #define ST_NO_TAPE 2 201 202 /* Values for door lock state */ 203 #define ST_UNLOCKED 0 204 #define ST_LOCKED_EXPLICIT 1 205 #define ST_LOCKED_AUTO 2 206 #define ST_LOCK_FAILS 3 207 208 /* Positioning SCSI-commands for Tandberg, etc. drives */ 209 #define QFA_REQUEST_BLOCK 0x02 210 #define QFA_SEEK_BLOCK 0x0c 211 212 /* Setting the binary options */ 213 #define ST_DONT_TOUCH 0 214 #define ST_NO 1 215 #define ST_YES 2 216 217 #define EXTENDED_SENSE_START 18 218 219 /* Masks for some conditions in the sense data */ 220 #define SENSE_FMK 0x80 221 #define SENSE_EOM 0x40 222 #define SENSE_ILI 0x20 223 224 #endif 225