1 /*
2 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
3 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
4 *
5 * May be copied or modified under the terms of the GNU General Public
6 * License. See linux/COPYING for more information.
7 *
8 * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
9 * DVD-RW devices.
10 *
11 */
12 #ifndef __PKTCDVD_H
13 #define __PKTCDVD_H
14
15 #include <linux/types.h>
16
17 /*
18 * 1 for normal debug messages, 2 is very verbose. 0 to turn it off.
19 */
20 #define PACKET_DEBUG 1
21
22 #define MAX_WRITERS 8
23
24 #define PKT_RB_POOL_SIZE 512
25
26 /*
27 * How long we should hold a non-full packet before starting data gathering.
28 */
29 #define PACKET_WAIT_TIME (HZ * 5 / 1000)
30
31 /*
32 * use drive write caching -- we need deferred error handling to be
33 * able to sucessfully recover with this option (drive will return good
34 * status as soon as the cdb is validated).
35 */
36 #if defined(CONFIG_CDROM_PKTCDVD_WCACHE)
37 #define USE_WCACHING 1
38 #else
39 #define USE_WCACHING 0
40 #endif
41
42 /*
43 * No user-servicable parts beyond this point ->
44 */
45
46 /*
47 * device types
48 */
49 #define PACKET_CDR 1
50 #define PACKET_CDRW 2
51 #define PACKET_DVDR 3
52 #define PACKET_DVDRW 4
53
54 /*
55 * flags
56 */
57 #define PACKET_WRITABLE 1 /* pd is writable */
58 #define PACKET_NWA_VALID 2 /* next writable address valid */
59 #define PACKET_LRA_VALID 3 /* last recorded address valid */
60 #define PACKET_MERGE_SEGS 4 /* perform segment merging to keep */
61 /* underlying cdrom device happy */
62
63 /*
64 * Disc status -- from READ_DISC_INFO
65 */
66 #define PACKET_DISC_EMPTY 0
67 #define PACKET_DISC_INCOMPLETE 1
68 #define PACKET_DISC_COMPLETE 2
69 #define PACKET_DISC_OTHER 3
70
71 /*
72 * write type, and corresponding data block type
73 */
74 #define PACKET_MODE1 1
75 #define PACKET_MODE2 2
76 #define PACKET_BLOCK_MODE1 8
77 #define PACKET_BLOCK_MODE2 10
78
79 /*
80 * Last session/border status
81 */
82 #define PACKET_SESSION_EMPTY 0
83 #define PACKET_SESSION_INCOMPLETE 1
84 #define PACKET_SESSION_RESERVED 2
85 #define PACKET_SESSION_COMPLETE 3
86
87 #define PACKET_MCN "4a656e734178626f65323030300000"
88
89 #undef PACKET_USE_LS
90
91 #define PKT_CTRL_CMD_SETUP 0
92 #define PKT_CTRL_CMD_TEARDOWN 1
93 #define PKT_CTRL_CMD_STATUS 2
94
95 struct pkt_ctrl_command {
96 __u32 command; /* in: Setup, teardown, status */
97 __u32 dev_index; /* in/out: Device index */
98 __u32 dev; /* in/out: Device nr for cdrw device */
99 __u32 pkt_dev; /* in/out: Device nr for packet device */
100 __u32 num_devices; /* out: Largest device index + 1 */
101 __u32 padding; /* Not used */
102 };
103
104 /*
105 * packet ioctls
106 */
107 #define PACKET_IOCTL_MAGIC ('X')
108 #define PACKET_CTRL_CMD _IOWR(PACKET_IOCTL_MAGIC, 1, struct pkt_ctrl_command)
109
110 #ifdef __KERNEL__
111 #include <linux/blkdev.h>
112 #include <linux/completion.h>
113 #include <linux/cdrom.h>
114
115 struct packet_settings
116 {
117 __u8 size; /* packet size in (512 byte) sectors */
118 __u8 fp; /* fixed packets */
119 __u8 link_loss; /* the rest is specified
120 * as per Mt Fuji */
121 __u8 write_type;
122 __u8 track_mode;
123 __u8 block_mode;
124 };
125
126 /*
127 * Very crude stats for now
128 */
129 struct packet_stats
130 {
131 unsigned long pkt_started;
132 unsigned long pkt_ended;
133 unsigned long secs_w;
134 unsigned long secs_rg;
135 unsigned long secs_r;
136 };
137
138 struct packet_cdrw
139 {
140 struct list_head pkt_free_list;
141 struct list_head pkt_active_list;
142 spinlock_t active_list_lock; /* Serialize access to pkt_active_list */
143 struct task_struct *thread;
144 atomic_t pending_bios;
145 };
146
147 /*
148 * Switch to high speed reading after reading this many kilobytes
149 * with no interspersed writes.
150 */
151 #define HI_SPEED_SWITCH 512
152
153 struct packet_iosched
154 {
155 atomic_t attention; /* Set to non-zero when queue processing is needed */
156 int writing; /* Non-zero when writing, zero when reading */
157 spinlock_t lock; /* Protecting read/write queue manipulations */
158 struct bio *read_queue;
159 struct bio *read_queue_tail;
160 struct bio *write_queue;
161 struct bio *write_queue_tail;
162 int high_prio_read; /* An important read request has been queued */
163 int successive_reads;
164 };
165
166 /*
167 * 32 buffers of 2048 bytes
168 */
169 #define PACKET_MAX_SIZE 32
170 #define PAGES_PER_PACKET (PACKET_MAX_SIZE * CD_FRAMESIZE / PAGE_SIZE)
171 #define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)
172
173 enum packet_data_state {
174 PACKET_IDLE_STATE, /* Not used at the moment */
175 PACKET_WAITING_STATE, /* Waiting for more bios to arrive, so */
176 /* we don't have to do as much */
177 /* data gathering */
178 PACKET_READ_WAIT_STATE, /* Waiting for reads to fill in holes */
179 PACKET_WRITE_WAIT_STATE, /* Waiting for the write to complete */
180 PACKET_RECOVERY_STATE, /* Recover after read/write errors */
181 PACKET_FINISHED_STATE, /* After write has finished */
182
183 PACKET_NUM_STATES /* Number of possible states */
184 };
185
186 /*
187 * Information needed for writing a single packet
188 */
189 struct pktcdvd_device;
190
191 struct packet_data
192 {
193 struct list_head list;
194
195 spinlock_t lock; /* Lock protecting state transitions and */
196 /* orig_bios list */
197
198 struct bio *orig_bios; /* Original bios passed to pkt_make_request */
199 struct bio *orig_bios_tail;/* that will be handled by this packet */
200 int write_size; /* Total size of all bios in the orig_bios */
201 /* list, measured in number of frames */
202
203 struct bio *w_bio; /* The bio we will send to the real CD */
204 /* device once we have all data for the */
205 /* packet we are going to write */
206 sector_t sector; /* First sector in this packet */
207 int frames; /* Number of frames in this packet */
208
209 enum packet_data_state state; /* Current state */
210 atomic_t run_sm; /* Incremented whenever the state */
211 /* machine needs to be run */
212 long sleep_time; /* Set this to non-zero to make the state */
213 /* machine run after this many jiffies. */
214
215 atomic_t io_wait; /* Number of pending IO operations */
216 atomic_t io_errors; /* Number of read/write errors during IO */
217
218 struct bio *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */
219 struct page *pages[PAGES_PER_PACKET];
220
221 int cache_valid; /* If non-zero, the data for the zone defined */
222 /* by the sector variable is completely cached */
223 /* in the pages[] vector. */
224
225 int id; /* ID number for debugging */
226 struct pktcdvd_device *pd;
227 };
228
229 struct pkt_rb_node {
230 struct rb_node rb_node;
231 struct bio *bio;
232 };
233
234 struct packet_stacked_data
235 {
236 struct bio *bio; /* Original read request bio */
237 struct pktcdvd_device *pd;
238 };
239 #define PSD_POOL_SIZE 64
240
241 struct pktcdvd_device
242 {
243 struct block_device *bdev; /* dev attached */
244 dev_t pkt_dev; /* our dev */
245 char name[20];
246 struct packet_settings settings;
247 struct packet_stats stats;
248 int refcnt; /* Open count */
249 int write_speed; /* current write speed, kB/s */
250 int read_speed; /* current read speed, kB/s */
251 unsigned long offset; /* start offset */
252 __u8 mode_offset; /* 0 / 8 */
253 __u8 type;
254 unsigned long flags;
255 __u16 mmc3_profile;
256 __u32 nwa; /* next writable address */
257 __u32 lra; /* last recorded address */
258 struct packet_cdrw cdrw;
259 wait_queue_head_t wqueue;
260
261 spinlock_t lock; /* Serialize access to bio_queue */
262 struct rb_root bio_queue; /* Work queue of bios we need to handle */
263 int bio_queue_size; /* Number of nodes in bio_queue */
264 sector_t current_sector; /* Keep track of where the elevator is */
265 atomic_t scan_queue; /* Set to non-zero when pkt_handle_queue */
266 /* needs to be run. */
267 mempool_t *rb_pool; /* mempool for pkt_rb_node allocations */
268
269 struct packet_iosched iosched;
270 struct gendisk *disk;
271 };
272
273 #endif /* __KERNEL__ */
274
275 #endif /* __PKTCDVD_H */
276
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