[linux-2.6-block.git] / include / linux / pktcdvd.h

/*
 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 *
 * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
 * DVD-RW devices.
 *
 */
#ifndef __PKTCDVD_H
#define __PKTCDVD_H

#include <linux/types.h>

/*
 * 1 for normal debug messages, 2 is very verbose. 0 to turn it off.
 */
#define PACKET_DEBUG		1

#define	MAX_WRITERS		8

#define PKT_RB_POOL_SIZE	512

/*
 * How long we should hold a non-full packet before starting data gathering.
 */
#define PACKET_WAIT_TIME	(HZ * 5 / 1000)

/*
 * use drive write caching -- we need deferred error handling to be
 * able to sucessfully recover with this option (drive will return good
 * status as soon as the cdb is validated).
 */
#if defined(CONFIG_CDROM_PKTCDVD_WCACHE)
#define USE_WCACHING		1
#else
#define USE_WCACHING		0
#endif

/*
 * No user-servicable parts beyond this point ->
 */

/*
 * device types
 */
#define PACKET_CDR		1
#define	PACKET_CDRW		2
#define PACKET_DVDR		3
#define PACKET_DVDRW		4

/*
 * flags
 */
#define PACKET_WRITABLE		1	/* pd is writable */
#define PACKET_NWA_VALID	2	/* next writable address valid */
#define PACKET_LRA_VALID	3	/* last recorded address valid */
#define PACKET_MERGE_SEGS	4	/* perform segment merging to keep */
					/* underlying cdrom device happy */

/*
 * Disc status -- from READ_DISC_INFO
 */
#define PACKET_DISC_EMPTY	0
#define PACKET_DISC_INCOMPLETE	1
#define PACKET_DISC_COMPLETE	2
#define PACKET_DISC_OTHER	3

/*
 * write type, and corresponding data block type
 */
#define PACKET_MODE1		1
#define PACKET_MODE2		2
#define PACKET_BLOCK_MODE1	8
#define PACKET_BLOCK_MODE2	10

/*
 * Last session/border status
 */
#define PACKET_SESSION_EMPTY		0
#define PACKET_SESSION_INCOMPLETE	1
#define PACKET_SESSION_RESERVED		2
#define PACKET_SESSION_COMPLETE		3

#define PACKET_MCN			"4a656e734178626f65323030300000"

#undef PACKET_USE_LS

#define PKT_CTRL_CMD_SETUP	0
#define PKT_CTRL_CMD_TEARDOWN	1
#define PKT_CTRL_CMD_STATUS	2

struct pkt_ctrl_command {
	__u32 command;				/* in: Setup, teardown, status */
	__u32 dev_index;			/* in/out: Device index */
	__u32 dev;				/* in/out: Device nr for cdrw device */
	__u32 pkt_dev;				/* in/out: Device nr for packet device */
	__u32 num_devices;			/* out: Largest device index + 1 */
	__u32 padding;				/* Not used */
};

/*
 * packet ioctls
 */
#define PACKET_IOCTL_MAGIC	('X')
#define PACKET_CTRL_CMD		_IOWR(PACKET_IOCTL_MAGIC, 1, struct pkt_ctrl_command)

#ifdef __KERNEL__
#include <linux/blkdev.h>
#include <linux/completion.h>
#include <linux/cdrom.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>

/* default bio write queue congestion marks */
#define PKT_WRITE_CONGESTION_ON    10000
#define PKT_WRITE_CONGESTION_OFF   9000


struct packet_settings
{
	__u32			size;		/* packet size in (512 byte) sectors */
	__u8			fp;		/* fixed packets */
	__u8			link_loss;	/* the rest is specified
						 * as per Mt Fuji */
	__u8			write_type;
	__u8			track_mode;
	__u8			block_mode;
};

/*
 * Very crude stats for now
 */
struct packet_stats
{
	unsigned long		pkt_started;
	unsigned long		pkt_ended;
	unsigned long		secs_w;
	unsigned long		secs_rg;
	unsigned long		secs_r;
};

struct packet_cdrw
{
	struct list_head	pkt_free_list;
	struct list_head	pkt_active_list;
	spinlock_t		active_list_lock; /* Serialize access to pkt_active_list */
	struct task_struct	*thread;
	atomic_t		pending_bios;
};

/*
 * Switch to high speed reading after reading this many kilobytes
 * with no interspersed writes.
 */
#define HI_SPEED_SWITCH 512

struct packet_iosched
{
	atomic_t		attention;	/* Set to non-zero when queue processing is needed */
	int			writing;	/* Non-zero when writing, zero when reading */
	spinlock_t		lock;		/* Protecting read/write queue manipulations */
	struct bio		*read_queue;
	struct bio		*read_queue_tail;
	struct bio		*write_queue;
	struct bio		*write_queue_tail;
	sector_t		last_write;	/* The sector where the last write ended */
	int			successive_reads;
};

/*
 * 32 buffers of 2048 bytes
 */
#if (PAGE_SIZE % CD_FRAMESIZE) != 0
#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
#endif
#define PACKET_MAX_SIZE		128
#define FRAMES_PER_PAGE		(PAGE_SIZE / CD_FRAMESIZE)
#define PACKET_MAX_SECTORS	(PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)

enum packet_data_state {
	PACKET_IDLE_STATE,			/* Not used at the moment */
	PACKET_WAITING_STATE,			/* Waiting for more bios to arrive, so */
						/* we don't have to do as much */
						/* data gathering */
	PACKET_READ_WAIT_STATE,			/* Waiting for reads to fill in holes */
	PACKET_WRITE_WAIT_STATE,		/* Waiting for the write to complete */
	PACKET_RECOVERY_STATE,			/* Recover after read/write errors */
	PACKET_FINISHED_STATE,			/* After write has finished */

	PACKET_NUM_STATES			/* Number of possible states */
};

/*
 * Information needed for writing a single packet
 */
struct pktcdvd_device;

struct packet_data
{
	struct list_head	list;

	spinlock_t		lock;		/* Lock protecting state transitions and */
						/* orig_bios list */

	struct bio		*orig_bios;	/* Original bios passed to pkt_make_request */
	struct bio		*orig_bios_tail;/* that will be handled by this packet */
	int			write_size;	/* Total size of all bios in the orig_bios */
						/* list, measured in number of frames */

	struct bio		*w_bio;		/* The bio we will send to the real CD */
						/* device once we have all data for the */
						/* packet we are going to write */
	sector_t		sector;		/* First sector in this packet */
	int			frames;		/* Number of frames in this packet */

	enum packet_data_state	state;		/* Current state */
	atomic_t		run_sm;		/* Incremented whenever the state */
						/* machine needs to be run */
	long			sleep_time;	/* Set this to non-zero to make the state */
						/* machine run after this many jiffies. */

	atomic_t		io_wait;	/* Number of pending IO operations */
	atomic_t		io_errors;	/* Number of read/write errors during IO */

	struct bio		*r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */
	struct page		*pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];

	int			cache_valid;	/* If non-zero, the data for the zone defined */
						/* by the sector variable is completely cached */
						/* in the pages[] vector. */

	int			id;		/* ID number for debugging */
	struct pktcdvd_device	*pd;
};

struct pkt_rb_node {
	struct rb_node		rb_node;
	struct bio		*bio;
};

struct packet_stacked_data
{
	struct bio		*bio;		/* Original read request bio */
	struct pktcdvd_device	*pd;
};
#define PSD_POOL_SIZE		64

struct pktcdvd_kobj
{
	struct kobject		kobj;
	struct pktcdvd_device	*pd;
};
#define to_pktcdvdkobj(_k) \
  ((struct pktcdvd_kobj*)container_of(_k,struct pktcdvd_kobj,kobj))

struct pktcdvd_device
{
	struct block_device	*bdev;		/* dev attached */
	dev_t			pkt_dev;	/* our dev */
	char			name[20];
	struct packet_settings	settings;
	struct packet_stats	stats;
	int			refcnt;		/* Open count */
	int			write_speed;	/* current write speed, kB/s */
	int			read_speed;	/* current read speed, kB/s */
	unsigned long		offset;		/* start offset */
	__u8			mode_offset;	/* 0 / 8 */
	__u8			type;
	unsigned long		flags;
	__u16			mmc3_profile;
	__u32			nwa;		/* next writable address */
	__u32			lra;		/* last recorded address */
	struct packet_cdrw	cdrw;
	wait_queue_head_t	wqueue;

	spinlock_t		lock;		/* Serialize access to bio_queue */
	struct rb_root		bio_queue;	/* Work queue of bios we need to handle */
	int			bio_queue_size;	/* Number of nodes in bio_queue */
	sector_t		current_sector;	/* Keep track of where the elevator is */
	atomic_t		scan_queue;	/* Set to non-zero when pkt_handle_queue */
						/* needs to be run. */
	mempool_t		*rb_pool;	/* mempool for pkt_rb_node allocations */

	struct packet_iosched   iosched;
	struct gendisk		*disk;

	int			write_congestion_off;
	int			write_congestion_on;

	struct device		*dev;		/* sysfs pktcdvd[0-7] dev */
	struct pktcdvd_kobj	*kobj_stat;	/* sysfs pktcdvd[0-7]/stat/     */
	struct pktcdvd_kobj	*kobj_wqueue;	/* sysfs pktcdvd[0-7]/write_queue/ */

	struct dentry		*dfs_d_root;	/* debugfs: devname directory */
	struct dentry		*dfs_f_info;	/* debugfs: info file */
};

#endif /* __KERNEL__ */

#endif /* __PKTCDVD_H */
Commit	Line	Data
1da177e4 LT	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>
32694850 TM	114	#include <linux/kobject.h>
32694850 TM	115	#include <linux/sysfs.h>
0a0fc960 TM	116
	117	/* default bio write queue congestion marks */
	118	#define PKT_WRITE_CONGESTION_ON 10000
	119	#define PKT_WRITE_CONGESTION_OFF 9000
	120
	121
1da177e4 LT	122	struct packet_settings
1da177e4 LT	123	{
a460ad62	124	__u32 size; /* packet size in (512 byte) sectors */
1da177e4 LT	125	__u8 fp; /* fixed packets */
	126	__u8 link_loss; /* the rest is specified
	127	* as per Mt Fuji */
	128	__u8 write_type;
	129	__u8 track_mode;
	130	__u8 block_mode;
	131	};
	132
	133	/*
	134	* Very crude stats for now
	135	*/
	136	struct packet_stats
	137	{
	138	unsigned long pkt_started;
	139	unsigned long pkt_ended;
	140	unsigned long secs_w;
	141	unsigned long secs_rg;
	142	unsigned long secs_r;
	143	};
	144
	145	struct packet_cdrw
	146	{
	147	struct list_head pkt_free_list;
	148	struct list_head pkt_active_list;
	149	spinlock_t active_list_lock; /* Serialize access to pkt_active_list */
	150	struct task_struct *thread;
	151	atomic_t pending_bios;
	152	};
	153
	154	/*
	155	* Switch to high speed reading after reading this many kilobytes
	156	* with no interspersed writes.
	157	*/
	158	#define HI_SPEED_SWITCH 512
	159
	160	struct packet_iosched
	161	{
	162	atomic_t attention; /* Set to non-zero when queue processing is needed */
	163	int writing; /* Non-zero when writing, zero when reading */
	164	spinlock_t lock; /* Protecting read/write queue manipulations */
	165	struct bio *read_queue;
	166	struct bio *read_queue_tail;
	167	struct bio *write_queue;
	168	struct bio *write_queue_tail;
46c271be	169	sector_t last_write; /* The sector where the last write ended */
1da177e4 LT	170	int successive_reads;
	171	};
	172
	173	/*
	174	* 32 buffers of 2048 bytes
	175	*/
610827de PO	176	#if (PAGE_SIZE % CD_FRAMESIZE) != 0
	177	#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
	178	#endif
5c55ac9b	179	#define PACKET_MAX_SIZE 128
e1bc89bc	180	#define FRAMES_PER_PAGE (PAGE_SIZE / CD_FRAMESIZE)
1da177e4 LT	181	#define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)
	182
	183	enum packet_data_state {
	184	PACKET_IDLE_STATE, /* Not used at the moment */
	185	PACKET_WAITING_STATE, /* Waiting for more bios to arrive, so */
	186	/* we don't have to do as much */
	187	/* data gathering */
	188	PACKET_READ_WAIT_STATE, /* Waiting for reads to fill in holes */
	189	PACKET_WRITE_WAIT_STATE, /* Waiting for the write to complete */
	190	PACKET_RECOVERY_STATE, /* Recover after read/write errors */
	191	PACKET_FINISHED_STATE, /* After write has finished */
	192
	193	PACKET_NUM_STATES /* Number of possible states */
	194	};
	195
	196	/*
	197	* Information needed for writing a single packet
	198	*/
	199	struct pktcdvd_device;
	200
	201	struct packet_data
	202	{
	203	struct list_head list;
	204
	205	spinlock_t lock; /* Lock protecting state transitions and */
	206	/* orig_bios list */
	207
	208	struct bio orig_bios; / Original bios passed to pkt_make_request */
	209	struct bio orig_bios_tail;/ that will be handled by this packet */
	210	int write_size; /* Total size of all bios in the orig_bios */
	211	/* list, measured in number of frames */
	212
	213	struct bio w_bio; / The bio we will send to the real CD */
	214	/* device once we have all data for the */
	215	/* packet we are going to write */
	216	sector_t sector; /* First sector in this packet */
	217	int frames; /* Number of frames in this packet */
	218
	219	enum packet_data_state state; /* Current state */
	220	atomic_t run_sm; /* Incremented whenever the state */
	221	/* machine needs to be run */
	222	long sleep_time; /* Set this to non-zero to make the state */
	223	/* machine run after this many jiffies. */
	224
	225	atomic_t io_wait; /* Number of pending IO operations */
	226	atomic_t io_errors; /* Number of read/write errors during IO */
	227
	228	struct bio r_bios[PACKET_MAX_SIZE]; / bios to use during data gathering */
e1bc89bc	229	struct page *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];
1da177e4 LT	230
	231	int cache_valid; /* If non-zero, the data for the zone defined */
	232	/* by the sector variable is completely cached */
	233	/* in the pages[] vector. */
	234
	235	int id; /* ID number for debugging */
	236	struct pktcdvd_device *pd;
	237	};
	238
	239	struct pkt_rb_node {
	240	struct rb_node rb_node;
	241	struct bio *bio;
	242	};
	243
	244	struct packet_stacked_data
	245	{
	246	struct bio bio; / Original read request bio */
	247	struct pktcdvd_device *pd;
	248	};
	249	#define PSD_POOL_SIZE 64
	250
32694850 TM	251	struct pktcdvd_kobj
	252	{
	253	struct kobject kobj;
	254	struct pktcdvd_device *pd;
	255	};
	256	#define to_pktcdvdkobj(_k) \
	257	((struct pktcdvd_kobj*)container_of(_k,struct pktcdvd_kobj,kobj))
	258
1da177e4 LT	259	struct pktcdvd_device
	260	{
	261	struct block_device bdev; / dev attached */
	262	dev_t pkt_dev; /* our dev */
	263	char name[20];
	264	struct packet_settings settings;
	265	struct packet_stats stats;
	266	int refcnt; /* Open count */
	267	int write_speed; /* current write speed, kB/s */
	268	int read_speed; /* current read speed, kB/s */
	269	unsigned long offset; /* start offset */
	270	__u8 mode_offset; /* 0 / 8 */
	271	__u8 type;
	272	unsigned long flags;
	273	__u16 mmc3_profile;
	274	__u32 nwa; /* next writable address */
	275	__u32 lra; /* last recorded address */
	276	struct packet_cdrw cdrw;
	277	wait_queue_head_t wqueue;
	278
	279	spinlock_t lock; /* Serialize access to bio_queue */
	280	struct rb_root bio_queue; /* Work queue of bios we need to handle */
	281	int bio_queue_size; /* Number of nodes in bio_queue */
	282	sector_t current_sector; /* Keep track of where the elevator is */
	283	atomic_t scan_queue; /* Set to non-zero when pkt_handle_queue */
	284	/* needs to be run. */
	285	mempool_t rb_pool; / mempool for pkt_rb_node allocations */
	286
	287	struct packet_iosched iosched;
	288	struct gendisk *disk;
0a0fc960 TM	289
	290	int write_congestion_off;
	291	int write_congestion_on;
32694850	292
6013c12b	293	struct device dev; / sysfs pktcdvd[0-7] dev */
32694850 TM	294	struct pktcdvd_kobj kobj_stat; / sysfs pktcdvd[0-7]/stat/ */
	295	struct pktcdvd_kobj kobj_wqueue; / sysfs pktcdvd[0-7]/write_queue/ */
	296
	297	struct dentry dfs_d_root; / debugfs: devname directory */
	298	struct dentry dfs_f_info; / debugfs: info file */
1da177e4 LT	299	};
	300
	301	#endif /* __KERNEL__ */
	302
	303	#endif /* __PKTCDVD_H */