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1da177e4 LT |
1 | |
2 | #ifndef _ST_H | |
3 | #define _ST_H | |
4 | ||
5 | #include <linux/completion.h> | |
28f85009 | 6 | #include <linux/mutex.h> |
f03a5670 | 7 | #include <linux/kref.h> |
8b05b773 | 8 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
9 | |
10 | /* Descriptor for analyzed sense data */ | |
11 | struct st_cmdstatus { | |
12 | int midlevel_result; | |
13 | struct scsi_sense_hdr sense_hdr; | |
14 | int have_sense; | |
40f6b36c | 15 | int residual; |
1da177e4 LT |
16 | u64 uremainder64; |
17 | u8 flags; | |
18 | u8 remainder_valid; | |
19 | u8 fixed_format; | |
20 | u8 deferred; | |
21 | }; | |
22 | ||
8b05b773 MC |
23 | struct scsi_tape; |
24 | ||
25 | /* scsi tape command */ | |
26 | struct 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; | |
13b53b44 | 32 | struct bio *bio; |
8b05b773 MC |
33 | }; |
34 | ||
1da177e4 LT |
35 | /* The tape buffer descriptor. */ |
36 | struct st_buffer { | |
1da177e4 | 37 | unsigned char dma; /* DMA-able buffer */ |
40f6b36c | 38 | unsigned char cleared; /* internal buffer cleared after open? */ |
7c018a90 | 39 | unsigned short do_dio; /* direct i/o set up? */ |
1da177e4 LT |
40 | int buffer_size; |
41 | int buffer_blocks; | |
42 | int buffer_bytes; | |
43 | int read_pointer; | |
44 | int writing; | |
45 | int syscall_result; | |
8b05b773 | 46 | struct st_request *last_SRpnt; |
1da177e4 | 47 | struct st_cmdstatus cmdstat; |
d0e1ae31 | 48 | struct page **reserved_pages; |
c982c368 | 49 | int reserved_page_order; |
6620742f | 50 | struct page **mapped_pages; |
d0e1ae31 | 51 | struct rq_map_data map_data; |
1da177e4 LT |
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 */ | |
1da177e4 | 55 | unsigned short frp_segs; /* number of buffer segments */ |
1da177e4 LT |
56 | }; |
57 | ||
1da177e4 LT |
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 */ | |
6c648d95 | 69 | struct scsi_tape *tape; |
26898afd | 70 | struct device *devs[2]; /* Auto-rewind and non-rewind devices */ |
1da177e4 LT |
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 | ||
6ed33a4a | 81 | #define ST_MAX_TAPES (1 << (20 - (ST_NBR_MODE_BITS + 1))) |
1da177e4 LT |
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; | |
28f85009 | 101 | struct mutex lock; /* For serialization */ |
1da177e4 LT |
102 | struct completion wait; /* For SCSI commands */ |
103 | struct st_buffer *buffer; | |
6c648d95 | 104 | int index; |
1da177e4 LT |
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? */ | |
9abe16c6 KM |
121 | unsigned char try_dio; /* try direct i/o in general? */ |
122 | unsigned char try_dio_now; /* try direct i/o before next close? */ | |
1da177e4 LT |
123 | unsigned char c_algo; /* compression algorithm */ |
124 | unsigned char pos_unknown; /* after reset position unknown */ | |
40f6b36c | 125 | unsigned char sili; /* use SILI when reading in variable b mode */ |
c743e44f | 126 | unsigned char immediate_filemark; /* write filemark immediately */ |
1da177e4 LT |
127 | int tape_type; |
128 | int long_timeout; /* timeout for commands known to take long time */ | |
129 | ||
130 | unsigned long max_pfn; /* the maximum page number reachable by the HBA */ | |
131 | ||
132 | /* Mode characteristics */ | |
133 | struct st_modedef modes[ST_NBR_MODES]; | |
134 | int current_mode; | |
135 | ||
136 | /* Status variables */ | |
137 | int partition; | |
138 | int new_partition; | |
139 | int nbr_partitions; /* zero until partition support enabled */ | |
140 | struct st_partstat ps[ST_NBR_PARTITIONS]; | |
141 | unsigned char dirty; | |
142 | unsigned char ready; | |
143 | unsigned char write_prot; | |
144 | unsigned char drv_write_prot; | |
145 | unsigned char in_use; | |
146 | unsigned char blksize_changed; | |
147 | unsigned char density_changed; | |
148 | unsigned char compression_changed; | |
149 | unsigned char drv_buffer; | |
150 | unsigned char density; | |
151 | unsigned char door_locked; | |
152 | unsigned char autorew_dev; /* auto-rewind device */ | |
153 | unsigned char rew_at_close; /* rewind necessary at close */ | |
154 | unsigned char inited; | |
155 | unsigned char cleaning_req; /* cleaning requested? */ | |
156 | int block_size; | |
157 | int min_block; | |
158 | int max_block; | |
159 | int recover_count; /* From tape opening */ | |
160 | int recover_reg; /* From last status call */ | |
161 | ||
162 | #if DEBUG | |
163 | unsigned char write_pending; | |
164 | int nbr_finished; | |
165 | int nbr_waits; | |
166 | int nbr_requests; | |
167 | int nbr_dio; | |
168 | int nbr_pages; | |
1da177e4 LT |
169 | unsigned char last_cmnd[6]; |
170 | unsigned char last_sense[16]; | |
171 | #endif | |
172 | struct gendisk *disk; | |
f03a5670 | 173 | struct kref kref; |
1da177e4 LT |
174 | }; |
175 | ||
176 | /* Bit masks for use_pf */ | |
177 | #define USE_PF 1 | |
178 | #define PF_TESTED 2 | |
179 | ||
180 | /* Values of eof */ | |
181 | #define ST_NOEOF 0 | |
182 | #define ST_FM_HIT 1 | |
183 | #define ST_FM 2 | |
184 | #define ST_EOM_OK 3 | |
185 | #define ST_EOM_ERROR 4 | |
186 | #define ST_EOD_1 5 | |
187 | #define ST_EOD_2 6 | |
188 | #define ST_EOD 7 | |
189 | /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => | |
190 | return zero => ST_EOD, return ENOSPC */ | |
191 | /* When writing: ST_EOM_OK == early warning found, write OK | |
192 | ST_EOD_1 == allow trying new write after early warning | |
193 | ST_EOM_ERROR == early warning found, not able to write all */ | |
194 | ||
195 | /* Values of rw */ | |
196 | #define ST_IDLE 0 | |
197 | #define ST_READING 1 | |
198 | #define ST_WRITING 2 | |
199 | ||
200 | /* Values of ready state */ | |
201 | #define ST_READY 0 | |
202 | #define ST_NOT_READY 1 | |
203 | #define ST_NO_TAPE 2 | |
204 | ||
205 | /* Values for door lock state */ | |
206 | #define ST_UNLOCKED 0 | |
207 | #define ST_LOCKED_EXPLICIT 1 | |
208 | #define ST_LOCKED_AUTO 2 | |
209 | #define ST_LOCK_FAILS 3 | |
210 | ||
211 | /* Positioning SCSI-commands for Tandberg, etc. drives */ | |
212 | #define QFA_REQUEST_BLOCK 0x02 | |
213 | #define QFA_SEEK_BLOCK 0x0c | |
214 | ||
215 | /* Setting the binary options */ | |
216 | #define ST_DONT_TOUCH 0 | |
217 | #define ST_NO 1 | |
218 | #define ST_YES 2 | |
219 | ||
220 | #define EXTENDED_SENSE_START 18 | |
221 | ||
222 | /* Masks for some conditions in the sense data */ | |
223 | #define SENSE_FMK 0x80 | |
224 | #define SENSE_EOM 0x40 | |
225 | #define SENSE_ILI 0x20 | |
226 | ||
227 | #endif |