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Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2#ifndef _ST_H
3#define _ST_H
4
5#include <linux/completion.h>
Matthias Kaehlcke28f85002007-07-29 23:38:15 +02006#include <linux/mutex.h>
Kai Makisaraf03a5672005-08-02 13:40:47 +03007#include <linux/kref.h>
Mike Christie8b05b772005-11-08 04:06:44 -06008#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
10/* Descriptor for analyzed sense data */
11struct st_cmdstatus {
12 int midlevel_result;
13 struct scsi_sense_hdr sense_hdr;
14 int have_sense;
Kai Makisara40f6b362008-02-24 22:23:24 +020015 int residual;
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 u64 uremainder64;
17 u8 flags;
18 u8 remainder_valid;
19 u8 fixed_format;
20 u8 deferred;
21};
22
Mike Christie8b05b772005-11-08 04:06:44 -060023struct 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;
FUJITA Tomonori13b53b42008-12-18 14:49:41 +090032 struct bio *bio;
Mike Christie8b05b772005-11-08 04:06:44 -060033};
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035/* The tape buffer descriptor. */
36struct st_buffer {
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 unsigned char dma; /* DMA-able buffer */
38 unsigned char do_dio; /* direct i/o set up? */
Kai Makisara40f6b362008-02-24 22:23:24 +020039 unsigned char cleared; /* internal buffer cleared after open? */
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 int buffer_size;
41 int buffer_blocks;
42 int buffer_bytes;
43 int read_pointer;
44 int writing;
45 int syscall_result;
Mike Christie8b05b772005-11-08 04:06:44 -060046 struct st_request *last_SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 struct st_cmdstatus cmdstat;
FUJITA Tomonorid0e1ae32008-12-18 14:49:40 +090048 struct page **reserved_pages;
FUJITA Tomonoric982c362009-11-26 09:24:13 +090049 int reserved_page_order;
FUJITA Tomonori66207422008-12-18 14:49:43 +090050 struct page **mapped_pages;
FUJITA Tomonorid0e1ae32008-12-18 14:49:40 +090051 struct rq_map_data map_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 unsigned short frp_segs; /* number of buffer segments */
Linus Torvalds1da177e2005-04-16 15:20:36 -070056};
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058/* 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 cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */
70};
71
72/* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
73 number of modes is 16 (ST_NBR_MODE_BITS 4) */
74#define ST_NBR_MODE_BITS 2
75#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
76#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
77#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
78
79#define ST_MAX_TAPES 128
80#define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
81
82/* The status related to each partition */
83struct st_partstat {
84 unsigned char rw;
85 unsigned char eof;
86 unsigned char at_sm;
87 unsigned char last_block_valid;
88 u32 last_block_visited;
89 int drv_block; /* The block where the drive head is */
90 int drv_file;
91};
92
93#define ST_NBR_PARTITIONS 4
94
95/* The tape drive descriptor */
96struct scsi_tape {
97 struct scsi_driver *driver;
98 struct scsi_device *device;
Matthias Kaehlcke28f85002007-07-29 23:38:15 +020099 struct mutex lock; /* For serialization */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 struct completion wait; /* For SCSI commands */
101 struct st_buffer *buffer;
102
103 /* Drive characteristics */
104 unsigned char omit_blklims;
105 unsigned char do_auto_lock;
106 unsigned char can_bsr;
107 unsigned char can_partitions;
108 unsigned char two_fm;
109 unsigned char fast_mteom;
110 unsigned char immediate;
111 unsigned char restr_dma;
112 unsigned char scsi2_logical;
113 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
114 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */
115 unsigned char cln_sense_value;
116 unsigned char cln_sense_mask;
117 unsigned char use_pf; /* Set Page Format bit in all mode selects? */
Kai Makisara9abe16c2007-02-03 13:21:29 +0200118 unsigned char try_dio; /* try direct i/o in general? */
119 unsigned char try_dio_now; /* try direct i/o before next close? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 unsigned char c_algo; /* compression algorithm */
121 unsigned char pos_unknown; /* after reset position unknown */
Kai Makisara40f6b362008-02-24 22:23:24 +0200122 unsigned char sili; /* use SILI when reading in variable b mode */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 unsigned char last_cmnd[6];
166 unsigned char last_sense[16];
167#endif
168 struct gendisk *disk;
Kai Makisaraf03a5672005-08-02 13:40:47 +0300169 struct kref kref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170};
171
172/* Bit masks for use_pf */
173#define USE_PF 1
174#define PF_TESTED 2
175
176/* Values of eof */
177#define ST_NOEOF 0
178#define ST_FM_HIT 1
179#define ST_FM 2
180#define ST_EOM_OK 3
181#define ST_EOM_ERROR 4
182#define ST_EOD_1 5
183#define ST_EOD_2 6
184#define ST_EOD 7
185/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
186 return zero => ST_EOD, return ENOSPC */
187/* When writing: ST_EOM_OK == early warning found, write OK
188 ST_EOD_1 == allow trying new write after early warning
189 ST_EOM_ERROR == early warning found, not able to write all */
190
191/* Values of rw */
192#define ST_IDLE 0
193#define ST_READING 1
194#define ST_WRITING 2
195
196/* Values of ready state */
197#define ST_READY 0
198#define ST_NOT_READY 1
199#define ST_NO_TAPE 2
200
201/* Values for door lock state */
202#define ST_UNLOCKED 0
203#define ST_LOCKED_EXPLICIT 1
204#define ST_LOCKED_AUTO 2
205#define ST_LOCK_FAILS 3
206
207/* Positioning SCSI-commands for Tandberg, etc. drives */
208#define QFA_REQUEST_BLOCK 0x02
209#define QFA_SEEK_BLOCK 0x0c
210
211/* Setting the binary options */
212#define ST_DONT_TOUCH 0
213#define ST_NO 1
214#define ST_YES 2
215
216#define EXTENDED_SENSE_START 18
217
218/* Masks for some conditions in the sense data */
219#define SENSE_FMK 0x80
220#define SENSE_EOM 0x40
221#define SENSE_ILI 0x20
222
223#endif