1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef _ST_H 4 #define _ST_H 5 6 #include <linux/completion.h> 7 #include <linux/mutex.h> 8 #include <linux/kref.h> 9 #include <scsi/scsi_cmnd.h> 10 11 /* Descriptor for analyzed sense data */ 12 struct st_cmdstatus { 13 int midlevel_result; 14 struct scsi_sense_hdr sense_hdr; 15 int have_sense; 16 int residual; 17 u64 uremainder64; 18 u8 flags; 19 u8 remainder_valid; 20 u8 fixed_format; 21 u8 deferred; 22 }; 23 24 struct scsi_tape; 25 26 /* scsi tape command */ 27 struct st_request { 28 unsigned char cmd[MAX_COMMAND_SIZE]; 29 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 30 int result; 31 struct scsi_tape *stp; 32 struct completion *waiting; 33 struct bio *bio; 34 }; 35 36 /* The tape buffer descriptor. */ 37 struct st_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 */ 59 struct 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 */ 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 /* Tape statistics */ 96 struct scsi_tape_stats { 97 atomic64_t read_byte_cnt; /* bytes read */ 98 atomic64_t write_byte_cnt; /* bytes written */ 99 atomic64_t in_flight; /* Number of I/Os in flight */ 100 atomic64_t read_cnt; /* Count of read requests */ 101 atomic64_t write_cnt; /* Count of write requests */ 102 atomic64_t other_cnt; /* Count of other requests either 103 * implicit or from user space 104 * ioctl. */ 105 atomic64_t resid_cnt; /* Count of resid_len > 0 */ 106 atomic64_t tot_read_time; /* ktime spent completing reads */ 107 atomic64_t tot_write_time; /* ktime spent completing writes */ 108 atomic64_t tot_io_time; /* ktime spent doing any I/O */ 109 ktime_t read_time; /* holds ktime request was queued */ 110 ktime_t write_time; /* holds ktime request was queued */ 111 ktime_t other_time; /* holds ktime request was queued */ 112 atomic_t last_read_size; /* Number of bytes issued for last read */ 113 atomic_t last_write_size; /* Number of bytes issued for last write */ 114 }; 115 116 #define ST_NBR_PARTITIONS 4 117 118 /* The tape drive descriptor */ 119 struct scsi_tape { 120 struct scsi_driver *driver; 121 struct scsi_device *device; 122 struct mutex lock; /* For serialization */ 123 struct completion wait; /* For SCSI commands */ 124 struct st_buffer *buffer; 125 int index; 126 127 /* Drive characteristics */ 128 unsigned char omit_blklims; 129 unsigned char do_auto_lock; 130 unsigned char can_bsr; 131 unsigned char can_partitions; 132 unsigned char two_fm; 133 unsigned char fast_mteom; 134 unsigned char immediate; 135 unsigned char scsi2_logical; 136 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ 137 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */ 138 unsigned char cln_sense_value; 139 unsigned char cln_sense_mask; 140 unsigned char use_pf; /* Set Page Format bit in all mode selects? */ 141 unsigned char try_dio; /* try direct i/o in general? */ 142 unsigned char try_dio_now; /* try direct i/o before next close? */ 143 unsigned char c_algo; /* compression algorithm */ 144 unsigned char pos_unknown; /* after reset position unknown */ 145 unsigned char sili; /* use SILI when reading in variable b mode */ 146 unsigned char immediate_filemark; /* write filemark immediately */ 147 int tape_type; 148 int long_timeout; /* timeout for commands known to take long time */ 149 150 /* Mode characteristics */ 151 struct st_modedef modes[ST_NBR_MODES]; 152 int current_mode; 153 154 /* Status variables */ 155 int partition; 156 int new_partition; 157 int nbr_partitions; /* zero until partition support enabled */ 158 struct st_partstat ps[ST_NBR_PARTITIONS]; 159 unsigned char dirty; 160 unsigned char ready; 161 unsigned char write_prot; 162 unsigned char drv_write_prot; 163 unsigned char in_use; 164 unsigned char blksize_changed; 165 unsigned char density_changed; 166 unsigned char compression_changed; 167 unsigned char drv_buffer; 168 unsigned char density; 169 unsigned char door_locked; 170 unsigned char autorew_dev; /* auto-rewind device */ 171 unsigned char rew_at_close; /* rewind necessary at close */ 172 unsigned char inited; 173 unsigned char cleaning_req; /* cleaning requested? */ 174 int block_size; 175 int min_block; 176 int max_block; 177 int recover_count; /* From tape opening */ 178 int recover_reg; /* From last status call */ 179 180 #if DEBUG 181 unsigned char write_pending; 182 int nbr_finished; 183 int nbr_waits; 184 int nbr_requests; 185 int nbr_dio; 186 int nbr_pages; 187 unsigned char last_cmnd[6]; 188 unsigned char last_sense[16]; 189 #endif 190 struct gendisk *disk; 191 struct kref kref; 192 struct scsi_tape_stats *stats; 193 }; 194 195 /* Bit masks for use_pf */ 196 #define USE_PF 1 197 #define PF_TESTED 2 198 199 /* Values of eof */ 200 #define ST_NOEOF 0 201 #define ST_FM_HIT 1 202 #define ST_FM 2 203 #define ST_EOM_OK 3 204 #define ST_EOM_ERROR 4 205 #define ST_EOD_1 5 206 #define ST_EOD_2 6 207 #define ST_EOD 7 208 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => 209 return zero => ST_EOD, return ENOSPC */ 210 /* When writing: ST_EOM_OK == early warning found, write OK 211 ST_EOD_1 == allow trying new write after early warning 212 ST_EOM_ERROR == early warning found, not able to write all */ 213 214 /* Values of rw */ 215 #define ST_IDLE 0 216 #define ST_READING 1 217 #define ST_WRITING 2 218 219 /* Values of ready state */ 220 #define ST_READY 0 221 #define ST_NOT_READY 1 222 #define ST_NO_TAPE 2 223 224 /* Values for door lock state */ 225 #define ST_UNLOCKED 0 226 #define ST_LOCKED_EXPLICIT 1 227 #define ST_LOCKED_AUTO 2 228 #define ST_LOCK_FAILS 3 229 230 /* Positioning SCSI-commands for Tandberg, etc. drives */ 231 #define QFA_REQUEST_BLOCK 0x02 232 #define QFA_SEEK_BLOCK 0x0c 233 234 /* Setting the binary options */ 235 #define ST_DONT_TOUCH 0 236 #define ST_NO 1 237 #define ST_YES 2 238 239 #define EXTENDED_SENSE_START 18 240 241 /* Masks for some conditions in the sense data */ 242 #define SENSE_FMK 0x80 243 #define SENSE_EOM 0x40 244 #define SENSE_ILI 0x20 245 246 #endif 247