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1 | |
2 | #ifndef _ST_H |
3 | #define _ST_H |
4 | |
5 | #include <linux/completion.h> |
6 | #include <linux/mutex.h> |
7 | #include <linux/kref.h> |
8 | #include <scsi/scsi_cmnd.h> |
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; |
15 | int residual; |
16 | u64 uremainder64; |
17 | u8 flags; |
18 | u8 remainder_valid; |
19 | u8 fixed_format; |
20 | u8 deferred; |
21 | }; |
22 | |
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; |
32 | struct bio *bio; |
33 | }; |
34 | |
35 | /* The tape buffer descriptor. */ |
36 | struct st_buffer { |
37 | unsigned char dma; /* DMA-able 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 | #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; |
101 | struct mutex lock; /* For serialization */ |
102 | struct completion wait; /* For SCSI commands */ |
103 | struct st_buffer *buffer; |
104 | int index; |
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 in general? */ |
122 | unsigned char try_dio_now; /* try direct i/o before next close? */ |
123 | unsigned char c_algo; /* compression algorithm */ |
124 | unsigned char pos_unknown; /* after reset position unknown */ |
125 | unsigned char sili; /* use SILI when reading in variable b mode */ |
126 | unsigned char immediate_filemark; /* write filemark immediately */ |
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; |
169 | unsigned char last_cmnd[6]; |
170 | unsigned char last_sense[16]; |
171 | #endif |
172 | struct gendisk *disk; |
173 | struct kref kref; |
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 |
228 |
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