Root/
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 successfully 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 | #include <linux/kobject.h> |
115 | #include <linux/sysfs.h> |
116 | #include <linux/mempool.h> |
117 | |
118 | /* default bio write queue congestion marks */ |
119 | #define PKT_WRITE_CONGESTION_ON 10000 |
120 | #define PKT_WRITE_CONGESTION_OFF 9000 |
121 | |
122 | |
123 | struct packet_settings |
124 | { |
125 | __u32 size; /* packet size in (512 byte) sectors */ |
126 | __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 | */ |
137 | struct 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 | |
146 | struct 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 | |
161 | struct 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_list read_queue; |
167 | struct bio_list write_queue; |
168 | sector_t last_write; /* The sector where the last write ended */ |
169 | int successive_reads; |
170 | }; |
171 | |
172 | /* |
173 | * 32 buffers of 2048 bytes |
174 | */ |
175 | #if (PAGE_SIZE % CD_FRAMESIZE) != 0 |
176 | #error "PAGE_SIZE must be a multiple of CD_FRAMESIZE" |
177 | #endif |
178 | #define PACKET_MAX_SIZE 128 |
179 | #define FRAMES_PER_PAGE (PAGE_SIZE / CD_FRAMESIZE) |
180 | #define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9) |
181 | |
182 | enum packet_data_state { |
183 | PACKET_IDLE_STATE, /* Not used at the moment */ |
184 | PACKET_WAITING_STATE, /* Waiting for more bios to arrive, so */ |
185 | /* we don't have to do as much */ |
186 | /* data gathering */ |
187 | PACKET_READ_WAIT_STATE, /* Waiting for reads to fill in holes */ |
188 | PACKET_WRITE_WAIT_STATE, /* Waiting for the write to complete */ |
189 | PACKET_RECOVERY_STATE, /* Recover after read/write errors */ |
190 | PACKET_FINISHED_STATE, /* After write has finished */ |
191 | |
192 | PACKET_NUM_STATES /* Number of possible states */ |
193 | }; |
194 | |
195 | /* |
196 | * Information needed for writing a single packet |
197 | */ |
198 | struct pktcdvd_device; |
199 | |
200 | struct packet_data |
201 | { |
202 | struct list_head list; |
203 | |
204 | spinlock_t lock; /* Lock protecting state transitions and */ |
205 | /* orig_bios list */ |
206 | |
207 | struct bio_list orig_bios; /* Original bios passed to pkt_make_request */ |
208 | /* that will be handled by this packet */ |
209 | int write_size; /* Total size of all bios in the orig_bios */ |
210 | /* list, measured in number of frames */ |
211 | |
212 | struct bio *w_bio; /* The bio we will send to the real CD */ |
213 | /* device once we have all data for the */ |
214 | /* packet we are going to write */ |
215 | sector_t sector; /* First sector in this packet */ |
216 | int frames; /* Number of frames in this packet */ |
217 | |
218 | enum packet_data_state state; /* Current state */ |
219 | atomic_t run_sm; /* Incremented whenever the state */ |
220 | /* machine needs to be run */ |
221 | long sleep_time; /* Set this to non-zero to make the state */ |
222 | /* machine run after this many jiffies. */ |
223 | |
224 | atomic_t io_wait; /* Number of pending IO operations */ |
225 | atomic_t io_errors; /* Number of read/write errors during IO */ |
226 | |
227 | struct bio *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */ |
228 | struct page *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE]; |
229 | |
230 | int cache_valid; /* If non-zero, the data for the zone defined */ |
231 | /* by the sector variable is completely cached */ |
232 | /* in the pages[] vector. */ |
233 | |
234 | int id; /* ID number for debugging */ |
235 | struct pktcdvd_device *pd; |
236 | }; |
237 | |
238 | struct pkt_rb_node { |
239 | struct rb_node rb_node; |
240 | struct bio *bio; |
241 | }; |
242 | |
243 | struct packet_stacked_data |
244 | { |
245 | struct bio *bio; /* Original read request bio */ |
246 | struct pktcdvd_device *pd; |
247 | }; |
248 | #define PSD_POOL_SIZE 64 |
249 | |
250 | struct pktcdvd_kobj |
251 | { |
252 | struct kobject kobj; |
253 | struct pktcdvd_device *pd; |
254 | }; |
255 | #define to_pktcdvdkobj(_k) \ |
256 | ((struct pktcdvd_kobj*)container_of(_k,struct pktcdvd_kobj,kobj)) |
257 | |
258 | struct pktcdvd_device |
259 | { |
260 | struct block_device *bdev; /* dev attached */ |
261 | dev_t pkt_dev; /* our dev */ |
262 | char name[20]; |
263 | struct packet_settings settings; |
264 | struct packet_stats stats; |
265 | int refcnt; /* Open count */ |
266 | int write_speed; /* current write speed, kB/s */ |
267 | int read_speed; /* current read speed, kB/s */ |
268 | unsigned long offset; /* start offset */ |
269 | __u8 mode_offset; /* 0 / 8 */ |
270 | __u8 type; |
271 | unsigned long flags; |
272 | __u16 mmc3_profile; |
273 | __u32 nwa; /* next writable address */ |
274 | __u32 lra; /* last recorded address */ |
275 | struct packet_cdrw cdrw; |
276 | wait_queue_head_t wqueue; |
277 | |
278 | spinlock_t lock; /* Serialize access to bio_queue */ |
279 | struct rb_root bio_queue; /* Work queue of bios we need to handle */ |
280 | int bio_queue_size; /* Number of nodes in bio_queue */ |
281 | sector_t current_sector; /* Keep track of where the elevator is */ |
282 | atomic_t scan_queue; /* Set to non-zero when pkt_handle_queue */ |
283 | /* needs to be run. */ |
284 | mempool_t *rb_pool; /* mempool for pkt_rb_node allocations */ |
285 | |
286 | struct packet_iosched iosched; |
287 | struct gendisk *disk; |
288 | |
289 | int write_congestion_off; |
290 | int write_congestion_on; |
291 | |
292 | struct device *dev; /* sysfs pktcdvd[0-7] dev */ |
293 | struct pktcdvd_kobj *kobj_stat; /* sysfs pktcdvd[0-7]/stat/ */ |
294 | struct pktcdvd_kobj *kobj_wqueue; /* sysfs pktcdvd[0-7]/write_queue/ */ |
295 | |
296 | struct dentry *dfs_d_root; /* debugfs: devname directory */ |
297 | struct dentry *dfs_f_info; /* debugfs: info file */ |
298 | }; |
299 | |
300 | #endif /* __KERNEL__ */ |
301 | |
302 | #endif /* __PKTCDVD_H */ |
303 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9