Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm / 4e6a06eec46067df3c30fe1fbc2e1a7cc37b9678 / . / drivers / scsi / st.h
blob: 061da111398e98cbe097c3845c6686d3be7f9cad [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1
2#ifndef _ST_H
3#define _ST_H
4
5#include <linux/completion.h>
6
7
8/* Descriptor for analyzed sense data */
9struct 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. */
21struct 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 */
44struct st_buf_fragment {
45 struct page *page;
46 unsigned int length;
47};
48
49/* The tape mode definition */
50struct 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 */
74struct 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 */
87struct 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