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246 lines
7.2 KiB
246 lines
7.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ST_H |
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#define _ST_H |
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#include <linux/completion.h> |
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#include <linux/mutex.h> |
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#include <linux/kref.h> |
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#include <scsi/scsi_cmnd.h> |
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/* Descriptor for analyzed sense data */ |
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struct st_cmdstatus { |
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int midlevel_result; |
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struct scsi_sense_hdr sense_hdr; |
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int have_sense; |
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int residual; |
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u64 uremainder64; |
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u8 flags; |
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u8 remainder_valid; |
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u8 fixed_format; |
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u8 deferred; |
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}; |
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struct scsi_tape; |
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/* scsi tape command */ |
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struct st_request { |
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unsigned char cmd[MAX_COMMAND_SIZE]; |
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unsigned char sense[SCSI_SENSE_BUFFERSIZE]; |
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int result; |
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struct scsi_tape *stp; |
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struct completion *waiting; |
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struct bio *bio; |
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}; |
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/* The tape buffer descriptor. */ |
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struct st_buffer { |
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unsigned char cleared; /* internal buffer cleared after open? */ |
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unsigned short do_dio; /* direct i/o set up? */ |
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int buffer_size; |
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int buffer_blocks; |
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int buffer_bytes; |
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int read_pointer; |
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int writing; |
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int syscall_result; |
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struct st_request *last_SRpnt; |
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struct st_cmdstatus cmdstat; |
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struct page **reserved_pages; |
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int reserved_page_order; |
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struct page **mapped_pages; |
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struct rq_map_data map_data; |
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unsigned char *b_data; |
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unsigned short use_sg; /* zero or max number of s/g segments for this adapter */ |
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unsigned short sg_segs; /* number of segments in s/g list */ |
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unsigned short frp_segs; /* number of buffer segments */ |
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}; |
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/* The tape mode definition */ |
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struct st_modedef { |
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unsigned char defined; |
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unsigned char sysv; /* SYS V semantics? */ |
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unsigned char do_async_writes; |
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unsigned char do_buffer_writes; |
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unsigned char do_read_ahead; |
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unsigned char defaults_for_writes; |
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unsigned char default_compression; /* 0 = don't touch, etc */ |
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short default_density; /* Forced density, -1 = no value */ |
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int default_blksize; /* Forced blocksize, -1 = no value */ |
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struct scsi_tape *tape; |
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struct device *devs[2]; /* Auto-rewind and non-rewind devices */ |
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struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */ |
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}; |
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/* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum |
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number of modes is 16 (ST_NBR_MODE_BITS 4) */ |
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#define ST_NBR_MODE_BITS 2 |
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#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS) |
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#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS) |
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#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT) |
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#define ST_MAX_TAPES (1 << (20 - (ST_NBR_MODE_BITS + 1))) |
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#define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1)) |
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/* The status related to each partition */ |
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struct st_partstat { |
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unsigned char rw; |
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unsigned char eof; |
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unsigned char at_sm; |
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unsigned char last_block_valid; |
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u32 last_block_visited; |
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int drv_block; /* The block where the drive head is */ |
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int drv_file; |
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}; |
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/* Tape statistics */ |
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struct scsi_tape_stats { |
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atomic64_t read_byte_cnt; /* bytes read */ |
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atomic64_t write_byte_cnt; /* bytes written */ |
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atomic64_t in_flight; /* Number of I/Os in flight */ |
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atomic64_t read_cnt; /* Count of read requests */ |
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atomic64_t write_cnt; /* Count of write requests */ |
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atomic64_t other_cnt; /* Count of other requests either |
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* implicit or from user space |
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* ioctl. */ |
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atomic64_t resid_cnt; /* Count of resid_len > 0 */ |
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atomic64_t tot_read_time; /* ktime spent completing reads */ |
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atomic64_t tot_write_time; /* ktime spent completing writes */ |
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atomic64_t tot_io_time; /* ktime spent doing any I/O */ |
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ktime_t read_time; /* holds ktime request was queued */ |
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ktime_t write_time; /* holds ktime request was queued */ |
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ktime_t other_time; /* holds ktime request was queued */ |
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atomic_t last_read_size; /* Number of bytes issued for last read */ |
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atomic_t last_write_size; /* Number of bytes issued for last write */ |
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}; |
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#define ST_NBR_PARTITIONS 4 |
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/* The tape drive descriptor */ |
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struct scsi_tape { |
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struct scsi_driver *driver; |
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struct scsi_device *device; |
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struct mutex lock; /* For serialization */ |
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struct completion wait; /* For SCSI commands */ |
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struct st_buffer *buffer; |
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int index; |
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/* Drive characteristics */ |
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unsigned char omit_blklims; |
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unsigned char do_auto_lock; |
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unsigned char can_bsr; |
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unsigned char can_partitions; |
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unsigned char two_fm; |
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unsigned char fast_mteom; |
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unsigned char immediate; |
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unsigned char scsi2_logical; |
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unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ |
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unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */ |
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unsigned char cln_sense_value; |
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unsigned char cln_sense_mask; |
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unsigned char use_pf; /* Set Page Format bit in all mode selects? */ |
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unsigned char try_dio; /* try direct i/o in general? */ |
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unsigned char try_dio_now; /* try direct i/o before next close? */ |
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unsigned char c_algo; /* compression algorithm */ |
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unsigned char pos_unknown; /* after reset position unknown */ |
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unsigned char sili; /* use SILI when reading in variable b mode */ |
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unsigned char immediate_filemark; /* write filemark immediately */ |
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int tape_type; |
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int long_timeout; /* timeout for commands known to take long time */ |
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/* Mode characteristics */ |
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struct st_modedef modes[ST_NBR_MODES]; |
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int current_mode; |
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/* Status variables */ |
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int partition; |
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int new_partition; |
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int nbr_partitions; /* zero until partition support enabled */ |
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struct st_partstat ps[ST_NBR_PARTITIONS]; |
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unsigned char dirty; |
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unsigned char ready; |
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unsigned char write_prot; |
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unsigned char drv_write_prot; |
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unsigned char in_use; |
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unsigned char blksize_changed; |
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unsigned char density_changed; |
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unsigned char compression_changed; |
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unsigned char drv_buffer; |
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unsigned char density; |
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unsigned char door_locked; |
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unsigned char autorew_dev; /* auto-rewind device */ |
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unsigned char rew_at_close; /* rewind necessary at close */ |
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unsigned char inited; |
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unsigned char cleaning_req; /* cleaning requested? */ |
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int block_size; |
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int min_block; |
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int max_block; |
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int recover_count; /* From tape opening */ |
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int recover_reg; /* From last status call */ |
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#if DEBUG |
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unsigned char write_pending; |
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int nbr_finished; |
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int nbr_waits; |
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int nbr_requests; |
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int nbr_dio; |
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int nbr_pages; |
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unsigned char last_cmnd[6]; |
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unsigned char last_sense[16]; |
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#endif |
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struct gendisk *disk; |
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struct kref kref; |
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struct scsi_tape_stats *stats; |
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}; |
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/* Bit masks for use_pf */ |
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#define USE_PF 1 |
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#define PF_TESTED 2 |
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/* Values of eof */ |
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#define ST_NOEOF 0 |
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#define ST_FM_HIT 1 |
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#define ST_FM 2 |
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#define ST_EOM_OK 3 |
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#define ST_EOM_ERROR 4 |
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#define ST_EOD_1 5 |
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#define ST_EOD_2 6 |
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#define ST_EOD 7 |
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/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => |
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return zero => ST_EOD, return ENOSPC */ |
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/* When writing: ST_EOM_OK == early warning found, write OK |
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ST_EOD_1 == allow trying new write after early warning |
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ST_EOM_ERROR == early warning found, not able to write all */ |
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/* Values of rw */ |
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#define ST_IDLE 0 |
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#define ST_READING 1 |
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#define ST_WRITING 2 |
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/* Values of ready state */ |
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#define ST_READY 0 |
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#define ST_NOT_READY 1 |
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#define ST_NO_TAPE 2 |
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/* Values for door lock state */ |
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#define ST_UNLOCKED 0 |
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#define ST_LOCKED_EXPLICIT 1 |
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#define ST_LOCKED_AUTO 2 |
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#define ST_LOCK_FAILS 3 |
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/* Positioning SCSI-commands for Tandberg, etc. drives */ |
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#define QFA_REQUEST_BLOCK 0x02 |
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#define QFA_SEEK_BLOCK 0x0c |
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/* Setting the binary options */ |
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#define ST_DONT_TOUCH 0 |
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#define ST_NO 1 |
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#define ST_YES 2 |
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#define EXTENDED_SENSE_START 18 |
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/* Masks for some conditions in the sense data */ |
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#define SENSE_FMK 0x80 |
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#define SENSE_EOM 0x40 |
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#define SENSE_ILI 0x20 |
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#endif
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