blob: 411209048d74ba7ccadcf3da0bf0df3de81e48e6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2#ifndef _ST_H
3#define _ST_H
4
5#include <linux/completion.h>
Kai Makisaraf03a5672005-08-02 13:40:47 +03006#include <linux/kref.h>
Mike Christie8b05b772005-11-08 04:06:44 -06007#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008
9/* Descriptor for analyzed sense data */
10struct 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
Mike Christie8b05b772005-11-08 04:06:44 -060021struct scsi_tape;
22
23/* scsi tape command */
24struct 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070032/* The tape buffer descriptor. */
33struct st_buffer {
34 unsigned char in_use;
35 unsigned char dma; /* DMA-able buffer */
36 unsigned char do_dio; /* direct i/o set up? */
37 int buffer_size;
38 int buffer_blocks;
39 int buffer_bytes;
40 int read_pointer;
41 int writing;
42 int syscall_result;
Mike Christie8b05b772005-11-08 04:06:44 -060043 struct st_request *last_SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 struct st_cmdstatus cmdstat;
45 unsigned char *b_data;
46 unsigned short use_sg; /* zero or max number of s/g segments for this adapter */
47 unsigned short sg_segs; /* number of segments in s/g list */
48 unsigned short orig_frp_segs; /* number of segments allocated at first try */
49 unsigned short frp_segs; /* number of buffer segments */
50 unsigned int frp_sg_current; /* driver buffer length currently in s/g list */
51 struct st_buf_fragment *frp; /* the allocated buffer fragment list */
52 struct scatterlist sg[1]; /* MUST BE last item */
53};
54
55/* The tape buffer fragment descriptor */
56struct st_buf_fragment {
57 struct page *page;
58 unsigned int length;
59};
60
61/* The tape mode definition */
62struct st_modedef {
63 unsigned char defined;
64 unsigned char sysv; /* SYS V semantics? */
65 unsigned char do_async_writes;
66 unsigned char do_buffer_writes;
67 unsigned char do_read_ahead;
68 unsigned char defaults_for_writes;
69 unsigned char default_compression; /* 0 = don't touch, etc */
70 short default_density; /* Forced density, -1 = no value */
71 int default_blksize; /* Forced blocksize, -1 = no value */
72 struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */
73};
74
75/* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
76 number of modes is 16 (ST_NBR_MODE_BITS 4) */
77#define ST_NBR_MODE_BITS 2
78#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
79#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
80#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
81
82#define ST_MAX_TAPES 128
83#define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
84
85/* The status related to each partition */
86struct st_partstat {
87 unsigned char rw;
88 unsigned char eof;
89 unsigned char at_sm;
90 unsigned char last_block_valid;
91 u32 last_block_visited;
92 int drv_block; /* The block where the drive head is */
93 int drv_file;
94};
95
96#define ST_NBR_PARTITIONS 4
97
98/* The tape drive descriptor */
99struct scsi_tape {
100 struct scsi_driver *driver;
101 struct scsi_device *device;
102 struct semaphore lock; /* For serialization */
103 struct completion wait; /* For SCSI commands */
104 struct st_buffer *buffer;
105
106 /* Drive characteristics */
107 unsigned char omit_blklims;
108 unsigned char do_auto_lock;
109 unsigned char can_bsr;
110 unsigned char can_partitions;
111 unsigned char two_fm;
112 unsigned char fast_mteom;
113 unsigned char immediate;
114 unsigned char restr_dma;
115 unsigned char scsi2_logical;
116 unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
117 unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */
118 unsigned char cln_sense_value;
119 unsigned char cln_sense_mask;
120 unsigned char use_pf; /* Set Page Format bit in all mode selects? */
121 unsigned char try_dio; /* try direct i/o? */
122 unsigned char c_algo; /* compression algorithm */
123 unsigned char pos_unknown; /* after reset position unknown */
124 int tape_type;
125 int long_timeout; /* timeout for commands known to take long time */
126
127 unsigned long max_pfn; /* the maximum page number reachable by the HBA */
128
129 /* Mode characteristics */
130 struct st_modedef modes[ST_NBR_MODES];
131 int current_mode;
132
133 /* Status variables */
134 int partition;
135 int new_partition;
136 int nbr_partitions; /* zero until partition support enabled */
137 struct st_partstat ps[ST_NBR_PARTITIONS];
138 unsigned char dirty;
139 unsigned char ready;
140 unsigned char write_prot;
141 unsigned char drv_write_prot;
142 unsigned char in_use;
143 unsigned char blksize_changed;
144 unsigned char density_changed;
145 unsigned char compression_changed;
146 unsigned char drv_buffer;
147 unsigned char density;
148 unsigned char door_locked;
149 unsigned char autorew_dev; /* auto-rewind device */
150 unsigned char rew_at_close; /* rewind necessary at close */
151 unsigned char inited;
152 unsigned char cleaning_req; /* cleaning requested? */
153 int block_size;
154 int min_block;
155 int max_block;
156 int recover_count; /* From tape opening */
157 int recover_reg; /* From last status call */
158
159#if DEBUG
160 unsigned char write_pending;
161 int nbr_finished;
162 int nbr_waits;
163 int nbr_requests;
164 int nbr_dio;
165 int nbr_pages;
166 int nbr_combinable;
167 unsigned char last_cmnd[6];
168 unsigned char last_sense[16];
169#endif
170 struct gendisk *disk;
Kai Makisaraf03a5672005-08-02 13:40:47 +0300171 struct kref kref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172};
173
174/* Bit masks for use_pf */
175#define USE_PF 1
176#define PF_TESTED 2
177
178/* Values of eof */
179#define ST_NOEOF 0
180#define ST_FM_HIT 1
181#define ST_FM 2
182#define ST_EOM_OK 3
183#define ST_EOM_ERROR 4
184#define ST_EOD_1 5
185#define ST_EOD_2 6
186#define ST_EOD 7
187/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
188 return zero => ST_EOD, return ENOSPC */
189/* When writing: ST_EOM_OK == early warning found, write OK
190 ST_EOD_1 == allow trying new write after early warning
191 ST_EOM_ERROR == early warning found, not able to write all */
192
193/* Values of rw */
194#define ST_IDLE 0
195#define ST_READING 1
196#define ST_WRITING 2
197
198/* Values of ready state */
199#define ST_READY 0
200#define ST_NOT_READY 1
201#define ST_NO_TAPE 2
202
203/* Values for door lock state */
204#define ST_UNLOCKED 0
205#define ST_LOCKED_EXPLICIT 1
206#define ST_LOCKED_AUTO 2
207#define ST_LOCK_FAILS 3
208
209/* Positioning SCSI-commands for Tandberg, etc. drives */
210#define QFA_REQUEST_BLOCK 0x02
211#define QFA_SEEK_BLOCK 0x0c
212
213/* Setting the binary options */
214#define ST_DONT_TOUCH 0
215#define ST_NO 1
216#define ST_YES 2
217
218#define EXTENDED_SENSE_START 18
219
220/* Masks for some conditions in the sense data */
221#define SENSE_FMK 0x80
222#define SENSE_EOM 0x40
223#define SENSE_ILI 0x20
224
225#endif