Commit | Line | Data |
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1da177e4 LT |
1 | |
2 | #ifndef _ST_H | |
3 | #define _ST_H | |
4 | ||
5 | #include <linux/completion.h> | |
6 | ||
7 | ||
8 | /* Descriptor for analyzed sense data */ | |
9 | struct st_cmdstatus { | |
10 | int midlevel_result; | |
11 | struct scsi_sense_hdr sense_hdr; | |
12 | int have_sense; | |
13 | u64 uremainder64; | |
14 | u8 flags; | |
15 | u8 remainder_valid; | |
16 | u8 fixed_format; | |
17 | u8 deferred; | |
18 | }; | |
19 | ||
20 | /* The tape buffer descriptor. */ | |
21 | struct st_buffer { | |
22 | unsigned char in_use; | |
23 | unsigned char dma; /* DMA-able buffer */ | |
24 | unsigned char do_dio; /* direct i/o set up? */ | |
25 | int buffer_size; | |
26 | int buffer_blocks; | |
27 | int buffer_bytes; | |
28 | int read_pointer; | |
29 | int writing; | |
30 | int syscall_result; | |
31 | struct scsi_request *last_SRpnt; | |
32 | struct st_cmdstatus cmdstat; | |
33 | unsigned char *b_data; | |
34 | unsigned short use_sg; /* zero or max number of s/g segments for this adapter */ | |
35 | unsigned short sg_segs; /* number of segments in s/g list */ | |
36 | unsigned short orig_frp_segs; /* number of segments allocated at first try */ | |
37 | unsigned short frp_segs; /* number of buffer segments */ | |
38 | unsigned int frp_sg_current; /* driver buffer length currently in s/g list */ | |
39 | struct st_buf_fragment *frp; /* the allocated buffer fragment list */ | |
40 | struct scatterlist sg[1]; /* MUST BE last item */ | |
41 | }; | |
42 | ||
43 | /* The tape buffer fragment descriptor */ | |
44 | struct st_buf_fragment { | |
45 | struct page *page; | |
46 | unsigned int length; | |
47 | }; | |
48 | ||
49 | /* The tape mode definition */ | |
50 | struct st_modedef { | |
51 | unsigned char defined; | |
52 | unsigned char sysv; /* SYS V semantics? */ | |
53 | unsigned char do_async_writes; | |
54 | unsigned char do_buffer_writes; | |
55 | unsigned char do_read_ahead; | |
56 | unsigned char defaults_for_writes; | |
57 | unsigned char default_compression; /* 0 = don't touch, etc */ | |
58 | short default_density; /* Forced density, -1 = no value */ | |
59 | int default_blksize; /* Forced blocksize, -1 = no value */ | |
60 | struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */ | |
61 | }; | |
62 | ||
63 | /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum | |
64 | number of modes is 16 (ST_NBR_MODE_BITS 4) */ | |
65 | #define ST_NBR_MODE_BITS 2 | |
66 | #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS) | |
67 | #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS) | |
68 | #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT) | |
69 | ||
70 | #define ST_MAX_TAPES 128 | |
71 | #define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1)) | |
72 | ||
73 | /* The status related to each partition */ | |
74 | struct st_partstat { | |
75 | unsigned char rw; | |
76 | unsigned char eof; | |
77 | unsigned char at_sm; | |
78 | unsigned char last_block_valid; | |
79 | u32 last_block_visited; | |
80 | int drv_block; /* The block where the drive head is */ | |
81 | int drv_file; | |
82 | }; | |
83 | ||
84 | #define ST_NBR_PARTITIONS 4 | |
85 | ||
86 | /* The tape drive descriptor */ | |
87 | struct scsi_tape { | |
88 | struct scsi_driver *driver; | |
89 | struct scsi_device *device; | |
90 | struct semaphore lock; /* For serialization */ | |
91 | struct completion wait; /* For SCSI commands */ | |
92 | struct st_buffer *buffer; | |
93 | ||
94 | /* Drive characteristics */ | |
95 | unsigned char omit_blklims; | |
96 | unsigned char do_auto_lock; | |
97 | unsigned char can_bsr; | |
98 | unsigned char can_partitions; | |
99 | unsigned char two_fm; | |
100 | unsigned char fast_mteom; | |
101 | unsigned char immediate; | |
102 | unsigned char restr_dma; | |
103 | unsigned char scsi2_logical; | |
104 | unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ | |
105 | unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */ | |
106 | unsigned char cln_sense_value; | |
107 | unsigned char cln_sense_mask; | |
108 | unsigned char use_pf; /* Set Page Format bit in all mode selects? */ | |
109 | unsigned char try_dio; /* try direct i/o? */ | |
110 | unsigned char c_algo; /* compression algorithm */ | |
111 | unsigned char pos_unknown; /* after reset position unknown */ | |
112 | int tape_type; | |
113 | int long_timeout; /* timeout for commands known to take long time */ | |
114 | ||
115 | unsigned long max_pfn; /* the maximum page number reachable by the HBA */ | |
116 | ||
117 | /* Mode characteristics */ | |
118 | struct st_modedef modes[ST_NBR_MODES]; | |
119 | int current_mode; | |
120 | ||
121 | /* Status variables */ | |
122 | int partition; | |
123 | int new_partition; | |
124 | int nbr_partitions; /* zero until partition support enabled */ | |
125 | struct st_partstat ps[ST_NBR_PARTITIONS]; | |
126 | unsigned char dirty; | |
127 | unsigned char ready; | |
128 | unsigned char write_prot; | |
129 | unsigned char drv_write_prot; | |
130 | unsigned char in_use; | |
131 | unsigned char blksize_changed; | |
132 | unsigned char density_changed; | |
133 | unsigned char compression_changed; | |
134 | unsigned char drv_buffer; | |
135 | unsigned char density; | |
136 | unsigned char door_locked; | |
137 | unsigned char autorew_dev; /* auto-rewind device */ | |
138 | unsigned char rew_at_close; /* rewind necessary at close */ | |
139 | unsigned char inited; | |
140 | unsigned char cleaning_req; /* cleaning requested? */ | |
141 | int block_size; | |
142 | int min_block; | |
143 | int max_block; | |
144 | int recover_count; /* From tape opening */ | |
145 | int recover_reg; /* From last status call */ | |
146 | ||
147 | #if DEBUG | |
148 | unsigned char write_pending; | |
149 | int nbr_finished; | |
150 | int nbr_waits; | |
151 | int nbr_requests; | |
152 | int nbr_dio; | |
153 | int nbr_pages; | |
154 | int nbr_combinable; | |
155 | unsigned char last_cmnd[6]; | |
156 | unsigned char last_sense[16]; | |
157 | #endif | |
158 | struct gendisk *disk; | |
159 | }; | |
160 | ||
161 | /* Bit masks for use_pf */ | |
162 | #define USE_PF 1 | |
163 | #define PF_TESTED 2 | |
164 | ||
165 | /* Values of eof */ | |
166 | #define ST_NOEOF 0 | |
167 | #define ST_FM_HIT 1 | |
168 | #define ST_FM 2 | |
169 | #define ST_EOM_OK 3 | |
170 | #define ST_EOM_ERROR 4 | |
171 | #define ST_EOD_1 5 | |
172 | #define ST_EOD_2 6 | |
173 | #define ST_EOD 7 | |
174 | /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => | |
175 | return zero => ST_EOD, return ENOSPC */ | |
176 | /* When writing: ST_EOM_OK == early warning found, write OK | |
177 | ST_EOD_1 == allow trying new write after early warning | |
178 | ST_EOM_ERROR == early warning found, not able to write all */ | |
179 | ||
180 | /* Values of rw */ | |
181 | #define ST_IDLE 0 | |
182 | #define ST_READING 1 | |
183 | #define ST_WRITING 2 | |
184 | ||
185 | /* Values of ready state */ | |
186 | #define ST_READY 0 | |
187 | #define ST_NOT_READY 1 | |
188 | #define ST_NO_TAPE 2 | |
189 | ||
190 | /* Values for door lock state */ | |
191 | #define ST_UNLOCKED 0 | |
192 | #define ST_LOCKED_EXPLICIT 1 | |
193 | #define ST_LOCKED_AUTO 2 | |
194 | #define ST_LOCK_FAILS 3 | |
195 | ||
196 | /* Positioning SCSI-commands for Tandberg, etc. drives */ | |
197 | #define QFA_REQUEST_BLOCK 0x02 | |
198 | #define QFA_SEEK_BLOCK 0x0c | |
199 | ||
200 | /* Setting the binary options */ | |
201 | #define ST_DONT_TOUCH 0 | |
202 | #define ST_NO 1 | |
203 | #define ST_YES 2 | |
204 | ||
205 | #define EXTENDED_SENSE_START 18 | |
206 | ||
207 | /* Masks for some conditions in the sense data */ | |
208 | #define SENSE_FMK 0x80 | |
209 | #define SENSE_EOM 0x40 | |
210 | #define SENSE_ILI 0x20 | |
211 | ||
212 | #endif |