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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; | |
15 | u64 uremainder64; | |
16 | u8 flags; | |
17 | u8 remainder_valid; | |
18 | u8 fixed_format; | |
19 | u8 deferred; | |
20 | }; | |
21 | ||
8b05b773 MC |
22 | struct scsi_tape; |
23 | ||
24 | /* scsi tape command */ | |
25 | struct st_request { | |
26 | unsigned char cmd[MAX_COMMAND_SIZE]; | |
27 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; | |
28 | int result; | |
29 | struct scsi_tape *stp; | |
30 | struct completion *waiting; | |
31 | }; | |
32 | ||
1da177e4 LT |
33 | /* The tape buffer descriptor. */ |
34 | struct st_buffer { | |
1da177e4 LT |
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; | |
8b05b773 | 43 | struct st_request *last_SRpnt; |
1da177e4 LT |
44 | 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 */ | |
56 | struct st_buf_fragment { | |
57 | struct page *page; | |
58 | unsigned int length; | |
59 | }; | |
60 | ||
61 | /* The tape mode definition */ | |
62 | struct 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 */ | |
86 | struct 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 */ | |
99 | struct scsi_tape { | |
100 | struct scsi_driver *driver; | |
101 | struct scsi_device *device; | |
28f85009 | 102 | struct mutex lock; /* For serialization */ |
1da177e4 LT |
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? */ | |
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 */ | |
125 | int tape_type; | |
126 | int long_timeout; /* timeout for commands known to take long time */ | |
127 | ||
128 | unsigned long max_pfn; /* the maximum page number reachable by the HBA */ | |
129 | ||
130 | /* Mode characteristics */ | |
131 | struct st_modedef modes[ST_NBR_MODES]; | |
132 | int current_mode; | |
133 | ||
134 | /* Status variables */ | |
135 | int partition; | |
136 | int new_partition; | |
137 | int nbr_partitions; /* zero until partition support enabled */ | |
138 | struct st_partstat ps[ST_NBR_PARTITIONS]; | |
139 | unsigned char dirty; | |
140 | unsigned char ready; | |
141 | unsigned char write_prot; | |
142 | unsigned char drv_write_prot; | |
143 | unsigned char in_use; | |
144 | unsigned char blksize_changed; | |
145 | unsigned char density_changed; | |
146 | unsigned char compression_changed; | |
147 | unsigned char drv_buffer; | |
148 | unsigned char density; | |
149 | unsigned char door_locked; | |
150 | unsigned char autorew_dev; /* auto-rewind device */ | |
151 | unsigned char rew_at_close; /* rewind necessary at close */ | |
152 | unsigned char inited; | |
153 | unsigned char cleaning_req; /* cleaning requested? */ | |
154 | int block_size; | |
155 | int min_block; | |
156 | int max_block; | |
157 | int recover_count; /* From tape opening */ | |
158 | int recover_reg; /* From last status call */ | |
159 | ||
160 | #if DEBUG | |
161 | unsigned char write_pending; | |
162 | int nbr_finished; | |
163 | int nbr_waits; | |
164 | int nbr_requests; | |
165 | int nbr_dio; | |
166 | int nbr_pages; | |
1da177e4 LT |
167 | unsigned char last_cmnd[6]; |
168 | unsigned char last_sense[16]; | |
169 | #endif | |
170 | struct gendisk *disk; | |
f03a5670 | 171 | struct kref kref; |
1da177e4 LT |
172 | }; |
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 |