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 do_dio;   /* direct i/o set up? */
39 	unsigned char cleared;  /* internal buffer cleared after open? */
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 cdev *cdevs[2];  /* Auto-rewind and non-rewind devices */
70 };
71 
72 /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
73    number of modes is 16 (ST_NBR_MODE_BITS 4) */
74 #define ST_NBR_MODE_BITS 2
75 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
76 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
77 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
78 
79 #define ST_MAX_TAPES 128
80 #define ST_MAX_TAPE_ENTRIES  (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
81 
82 /* The status related to each partition */
83 struct st_partstat {
84 	unsigned char rw;
85 	unsigned char eof;
86 	unsigned char at_sm;
87 	unsigned char last_block_valid;
88 	u32 last_block_visited;
89 	int drv_block;		/* The block where the drive head is */
90 	int drv_file;
91 };
92 
93 #define ST_NBR_PARTITIONS 4
94 
95 /* The tape drive descriptor */
96 struct scsi_tape {
97 	struct scsi_driver *driver;
98 	struct scsi_device *device;
99 	struct mutex lock;	/* For serialization */
100 	struct completion wait;	/* For SCSI commands */
101 	struct st_buffer *buffer;
102 
103 	/* Drive characteristics */
104 	unsigned char omit_blklims;
105 	unsigned char do_auto_lock;
106 	unsigned char can_bsr;
107 	unsigned char can_partitions;
108 	unsigned char two_fm;
109 	unsigned char fast_mteom;
110 	unsigned char immediate;
111 	unsigned char restr_dma;
112 	unsigned char scsi2_logical;
113 	unsigned char default_drvbuffer;	/* 0xff = don't touch, value 3 bits */
114 	unsigned char cln_mode;			/* 0 = none, otherwise sense byte nbr */
115 	unsigned char cln_sense_value;
116 	unsigned char cln_sense_mask;
117 	unsigned char use_pf;			/* Set Page Format bit in all mode selects? */
118 	unsigned char try_dio;			/* try direct i/o in general? */
119 	unsigned char try_dio_now;		/* try direct i/o before next close? */
120 	unsigned char c_algo;			/* compression algorithm */
121 	unsigned char pos_unknown;			/* after reset position unknown */
122 	unsigned char sili;			/* use SILI when reading in variable b mode */
123 	unsigned char immediate_filemark;	/* write filemark immediately */
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 	unsigned char last_cmnd[6];
167 	unsigned char last_sense[16];
168 #endif
169 	struct gendisk *disk;
170 	struct kref     kref;
171 };
172 
173 /* Bit masks for use_pf */
174 #define USE_PF      1
175 #define PF_TESTED   2
176 
177 /* Values of eof */
178 #define	ST_NOEOF	0
179 #define ST_FM_HIT       1
180 #define ST_FM           2
181 #define ST_EOM_OK       3
182 #define ST_EOM_ERROR	4
183 #define	ST_EOD_1        5
184 #define ST_EOD_2        6
185 #define ST_EOD		7
186 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
187    return zero => ST_EOD, return ENOSPC */
188 /* When writing: ST_EOM_OK == early warning found, write OK
189 		 ST_EOD_1  == allow trying new write after early warning
190 		 ST_EOM_ERROR == early warning found, not able to write all */
191 
192 /* Values of rw */
193 #define	ST_IDLE		0
194 #define	ST_READING	1
195 #define	ST_WRITING	2
196 
197 /* Values of ready state */
198 #define ST_READY	0
199 #define ST_NOT_READY	1
200 #define ST_NO_TAPE	2
201 
202 /* Values for door lock state */
203 #define ST_UNLOCKED	0
204 #define ST_LOCKED_EXPLICIT 1
205 #define ST_LOCKED_AUTO  2
206 #define ST_LOCK_FAILS   3
207 
208 /* Positioning SCSI-commands for Tandberg, etc. drives */
209 #define	QFA_REQUEST_BLOCK	0x02
210 #define	QFA_SEEK_BLOCK		0x0c
211 
212 /* Setting the binary options */
213 #define ST_DONT_TOUCH  0
214 #define ST_NO          1
215 #define ST_YES         2
216 
217 #define EXTENDED_SENSE_START  18
218 
219 /* Masks for some conditions in the sense data */
220 #define SENSE_FMK   0x80
221 #define SENSE_EOM   0x40
222 #define SENSE_ILI   0x20
223 
224 #endif
225