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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
95struct 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>
Thomas Maier32694852006-12-08 02:36:12 -0800114#include <linux/kobject.h>
115#include <linux/sysfs.h>
Alexander Beregalov097102c2009-04-21 09:33:14 +0200116#include <linux/mempool.h>
Thomas Maier0a0fc962006-12-08 02:36:11 -0800117
118/* default bio write queue congestion marks */
119#define PKT_WRITE_CONGESTION_ON 10000
120#define PKT_WRITE_CONGESTION_OFF 9000
121
122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123struct packet_settings
124{
Phillip Susia460ad62006-02-04 23:27:44 -0800125 __u32 size; /* packet size in (512 byte) sectors */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 __u8 fp; /* fixed packets */
127 __u8 link_loss; /* the rest is specified
128 * as per Mt Fuji */
129 __u8 write_type;
130 __u8 track_mode;
131 __u8 block_mode;
132};
133
134/*
135 * Very crude stats for now
136 */
137struct packet_stats
138{
139 unsigned long pkt_started;
140 unsigned long pkt_ended;
141 unsigned long secs_w;
142 unsigned long secs_rg;
143 unsigned long secs_r;
144};
145
146struct packet_cdrw
147{
148 struct list_head pkt_free_list;
149 struct list_head pkt_active_list;
150 spinlock_t active_list_lock; /* Serialize access to pkt_active_list */
151 struct task_struct *thread;
152 atomic_t pending_bios;
153};
154
155/*
156 * Switch to high speed reading after reading this many kilobytes
157 * with no interspersed writes.
158 */
159#define HI_SPEED_SWITCH 512
160
161struct packet_iosched
162{
163 atomic_t attention; /* Set to non-zero when queue processing is needed */
164 int writing; /* Non-zero when writing, zero when reading */
165 spinlock_t lock; /* Protecting read/write queue manipulations */
166 struct bio *read_queue;
167 struct bio *read_queue_tail;
168 struct bio *write_queue;
169 struct bio *write_queue_tail;
Peter Osterlund46c271b2005-06-23 00:10:02 -0700170 sector_t last_write; /* The sector where the last write ended */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 int successive_reads;
172};
173
174/*
175 * 32 buffers of 2048 bytes
176 */
Peter Osterlund610827d2005-09-13 01:25:29 -0700177#if (PAGE_SIZE % CD_FRAMESIZE) != 0
178#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
179#endif
Phillip Susi5c55ac92006-02-04 23:27:48 -0800180#define PACKET_MAX_SIZE 128
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800181#define FRAMES_PER_PAGE (PAGE_SIZE / CD_FRAMESIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182#define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)
183
184enum packet_data_state {
185 PACKET_IDLE_STATE, /* Not used at the moment */
186 PACKET_WAITING_STATE, /* Waiting for more bios to arrive, so */
187 /* we don't have to do as much */
188 /* data gathering */
189 PACKET_READ_WAIT_STATE, /* Waiting for reads to fill in holes */
190 PACKET_WRITE_WAIT_STATE, /* Waiting for the write to complete */
191 PACKET_RECOVERY_STATE, /* Recover after read/write errors */
192 PACKET_FINISHED_STATE, /* After write has finished */
193
194 PACKET_NUM_STATES /* Number of possible states */
195};
196
197/*
198 * Information needed for writing a single packet
199 */
200struct pktcdvd_device;
201
202struct packet_data
203{
204 struct list_head list;
205
206 spinlock_t lock; /* Lock protecting state transitions and */
207 /* orig_bios list */
208
209 struct bio *orig_bios; /* Original bios passed to pkt_make_request */
210 struct bio *orig_bios_tail;/* that will be handled by this packet */
211 int write_size; /* Total size of all bios in the orig_bios */
212 /* list, measured in number of frames */
213
214 struct bio *w_bio; /* The bio we will send to the real CD */
215 /* device once we have all data for the */
216 /* packet we are going to write */
217 sector_t sector; /* First sector in this packet */
218 int frames; /* Number of frames in this packet */
219
220 enum packet_data_state state; /* Current state */
221 atomic_t run_sm; /* Incremented whenever the state */
222 /* machine needs to be run */
223 long sleep_time; /* Set this to non-zero to make the state */
224 /* machine run after this many jiffies. */
225
226 atomic_t io_wait; /* Number of pending IO operations */
227 atomic_t io_errors; /* Number of read/write errors during IO */
228
229 struct bio *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800230 struct page *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 int cache_valid; /* If non-zero, the data for the zone defined */
233 /* by the sector variable is completely cached */
234 /* in the pages[] vector. */
235
236 int id; /* ID number for debugging */
237 struct pktcdvd_device *pd;
238};
239
240struct pkt_rb_node {
241 struct rb_node rb_node;
242 struct bio *bio;
243};
244
245struct packet_stacked_data
246{
247 struct bio *bio; /* Original read request bio */
248 struct pktcdvd_device *pd;
249};
250#define PSD_POOL_SIZE 64
251
Thomas Maier32694852006-12-08 02:36:12 -0800252struct pktcdvd_kobj
253{
254 struct kobject kobj;
255 struct pktcdvd_device *pd;
256};
257#define to_pktcdvdkobj(_k) \
258 ((struct pktcdvd_kobj*)container_of(_k,struct pktcdvd_kobj,kobj))
259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260struct pktcdvd_device
261{
262 struct block_device *bdev; /* dev attached */
263 dev_t pkt_dev; /* our dev */
264 char name[20];
265 struct packet_settings settings;
266 struct packet_stats stats;
267 int refcnt; /* Open count */
268 int write_speed; /* current write speed, kB/s */
269 int read_speed; /* current read speed, kB/s */
270 unsigned long offset; /* start offset */
271 __u8 mode_offset; /* 0 / 8 */
272 __u8 type;
273 unsigned long flags;
274 __u16 mmc3_profile;
275 __u32 nwa; /* next writable address */
276 __u32 lra; /* last recorded address */
277 struct packet_cdrw cdrw;
278 wait_queue_head_t wqueue;
279
280 spinlock_t lock; /* Serialize access to bio_queue */
281 struct rb_root bio_queue; /* Work queue of bios we need to handle */
282 int bio_queue_size; /* Number of nodes in bio_queue */
283 sector_t current_sector; /* Keep track of where the elevator is */
284 atomic_t scan_queue; /* Set to non-zero when pkt_handle_queue */
285 /* needs to be run. */
286 mempool_t *rb_pool; /* mempool for pkt_rb_node allocations */
287
288 struct packet_iosched iosched;
289 struct gendisk *disk;
Thomas Maier0a0fc962006-12-08 02:36:11 -0800290
291 int write_congestion_off;
292 int write_congestion_on;
Thomas Maier32694852006-12-08 02:36:12 -0800293
Tony Jones6013c122007-09-25 02:03:03 +0200294 struct device *dev; /* sysfs pktcdvd[0-7] dev */
Thomas Maier32694852006-12-08 02:36:12 -0800295 struct pktcdvd_kobj *kobj_stat; /* sysfs pktcdvd[0-7]/stat/ */
296 struct pktcdvd_kobj *kobj_wqueue; /* sysfs pktcdvd[0-7]/write_queue/ */
297
298 struct dentry *dfs_d_root; /* debugfs: devname directory */
299 struct dentry *dfs_f_info; /* debugfs: info file */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300};
301
302#endif /* __KERNEL__ */
303
304#endif /* __PKTCDVD_H */