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TOMOYO Linux Cross Reference
Linux/include/linux/pktcdvd.h

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  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 

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