Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6-microblaze.git] / include / linux / pktcdvd.h
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/blkdev.h>
16 #include <linux/completion.h>
17 #include <linux/cdrom.h>
18 #include <linux/kobject.h>
19 #include <linux/sysfs.h>
20 #include <linux/mempool.h>
21 #include <uapi/linux/pktcdvd.h>
22
23 /* default bio write queue congestion marks */
24 #define PKT_WRITE_CONGESTION_ON    10000
25 #define PKT_WRITE_CONGESTION_OFF   9000
26
27
28 struct packet_settings
29 {
30         __u32                   size;           /* packet size in (512 byte) sectors */
31         __u8                    fp;             /* fixed packets */
32         __u8                    link_loss;      /* the rest is specified
33                                                  * as per Mt Fuji */
34         __u8                    write_type;
35         __u8                    track_mode;
36         __u8                    block_mode;
37 };
38
39 /*
40  * Very crude stats for now
41  */
42 struct packet_stats
43 {
44         unsigned long           pkt_started;
45         unsigned long           pkt_ended;
46         unsigned long           secs_w;
47         unsigned long           secs_rg;
48         unsigned long           secs_r;
49 };
50
51 struct packet_cdrw
52 {
53         struct list_head        pkt_free_list;
54         struct list_head        pkt_active_list;
55         spinlock_t              active_list_lock; /* Serialize access to pkt_active_list */
56         struct task_struct      *thread;
57         atomic_t                pending_bios;
58 };
59
60 /*
61  * Switch to high speed reading after reading this many kilobytes
62  * with no interspersed writes.
63  */
64 #define HI_SPEED_SWITCH 512
65
66 struct packet_iosched
67 {
68         atomic_t                attention;      /* Set to non-zero when queue processing is needed */
69         int                     writing;        /* Non-zero when writing, zero when reading */
70         spinlock_t              lock;           /* Protecting read/write queue manipulations */
71         struct bio_list         read_queue;
72         struct bio_list         write_queue;
73         sector_t                last_write;     /* The sector where the last write ended */
74         int                     successive_reads;
75 };
76
77 /*
78  * 32 buffers of 2048 bytes
79  */
80 #if (PAGE_SIZE % CD_FRAMESIZE) != 0
81 #error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
82 #endif
83 #define PACKET_MAX_SIZE         128
84 #define FRAMES_PER_PAGE         (PAGE_SIZE / CD_FRAMESIZE)
85 #define PACKET_MAX_SECTORS      (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)
86
87 enum packet_data_state {
88         PACKET_IDLE_STATE,                      /* Not used at the moment */
89         PACKET_WAITING_STATE,                   /* Waiting for more bios to arrive, so */
90                                                 /* we don't have to do as much */
91                                                 /* data gathering */
92         PACKET_READ_WAIT_STATE,                 /* Waiting for reads to fill in holes */
93         PACKET_WRITE_WAIT_STATE,                /* Waiting for the write to complete */
94         PACKET_RECOVERY_STATE,                  /* Recover after read/write errors */
95         PACKET_FINISHED_STATE,                  /* After write has finished */
96
97         PACKET_NUM_STATES                       /* Number of possible states */
98 };
99
100 /*
101  * Information needed for writing a single packet
102  */
103 struct pktcdvd_device;
104
105 struct packet_data
106 {
107         struct list_head        list;
108
109         spinlock_t              lock;           /* Lock protecting state transitions and */
110                                                 /* orig_bios list */
111
112         struct bio_list         orig_bios;      /* Original bios passed to pkt_make_request */
113                                                 /* that will be handled by this packet */
114         int                     write_size;     /* Total size of all bios in the orig_bios */
115                                                 /* list, measured in number of frames */
116
117         struct bio              *w_bio;         /* The bio we will send to the real CD */
118                                                 /* device once we have all data for the */
119                                                 /* packet we are going to write */
120         sector_t                sector;         /* First sector in this packet */
121         int                     frames;         /* Number of frames in this packet */
122
123         enum packet_data_state  state;          /* Current state */
124         atomic_t                run_sm;         /* Incremented whenever the state */
125                                                 /* machine needs to be run */
126         long                    sleep_time;     /* Set this to non-zero to make the state */
127                                                 /* machine run after this many jiffies. */
128
129         atomic_t                io_wait;        /* Number of pending IO operations */
130         atomic_t                io_errors;      /* Number of read/write errors during IO */
131
132         struct bio              *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */
133         struct page             *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];
134
135         int                     cache_valid;    /* If non-zero, the data for the zone defined */
136                                                 /* by the sector variable is completely cached */
137                                                 /* in the pages[] vector. */
138
139         int                     id;             /* ID number for debugging */
140         struct pktcdvd_device   *pd;
141 };
142
143 struct pkt_rb_node {
144         struct rb_node          rb_node;
145         struct bio              *bio;
146 };
147
148 struct packet_stacked_data
149 {
150         struct bio              *bio;           /* Original read request bio */
151         struct pktcdvd_device   *pd;
152 };
153 #define PSD_POOL_SIZE           64
154
155 struct pktcdvd_kobj
156 {
157         struct kobject          kobj;
158         struct pktcdvd_device   *pd;
159 };
160 #define to_pktcdvdkobj(_k) \
161   ((struct pktcdvd_kobj*)container_of(_k,struct pktcdvd_kobj,kobj))
162
163 struct pktcdvd_device
164 {
165         struct block_device     *bdev;          /* dev attached */
166         dev_t                   pkt_dev;        /* our dev */
167         char                    name[20];
168         struct packet_settings  settings;
169         struct packet_stats     stats;
170         int                     refcnt;         /* Open count */
171         int                     write_speed;    /* current write speed, kB/s */
172         int                     read_speed;     /* current read speed, kB/s */
173         unsigned long           offset;         /* start offset */
174         __u8                    mode_offset;    /* 0 / 8 */
175         __u8                    type;
176         unsigned long           flags;
177         __u16                   mmc3_profile;
178         __u32                   nwa;            /* next writable address */
179         __u32                   lra;            /* last recorded address */
180         struct packet_cdrw      cdrw;
181         wait_queue_head_t       wqueue;
182
183         spinlock_t              lock;           /* Serialize access to bio_queue */
184         struct rb_root          bio_queue;      /* Work queue of bios we need to handle */
185         int                     bio_queue_size; /* Number of nodes in bio_queue */
186         sector_t                current_sector; /* Keep track of where the elevator is */
187         atomic_t                scan_queue;     /* Set to non-zero when pkt_handle_queue */
188                                                 /* needs to be run. */
189         mempool_t               rb_pool;        /* mempool for pkt_rb_node allocations */
190
191         struct packet_iosched   iosched;
192         struct gendisk          *disk;
193
194         int                     write_congestion_off;
195         int                     write_congestion_on;
196
197         struct device           *dev;           /* sysfs pktcdvd[0-7] dev */
198         struct pktcdvd_kobj     *kobj_stat;     /* sysfs pktcdvd[0-7]/stat/     */
199         struct pktcdvd_kobj     *kobj_wqueue;   /* sysfs pktcdvd[0-7]/write_queue/ */
200
201         struct dentry           *dfs_d_root;    /* debugfs: devname directory */
202         struct dentry           *dfs_f_info;    /* debugfs: info file */
203 };
204
205 #endif /* __PKTCDVD_H */