304 lines
8.1 KiB
C
304 lines
8.1 KiB
C
/*
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* Copyright (C) 2000 Jens Axboe <axboe@suse.de>
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* Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
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* DVD-RW devices.
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*
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*/
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#ifndef __PKTCDVD_H
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#define __PKTCDVD_H
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#include <linux/types.h>
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/*
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* 1 for normal debug messages, 2 is very verbose. 0 to turn it off.
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*/
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#define PACKET_DEBUG 1
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#define MAX_WRITERS 8
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#define PKT_RB_POOL_SIZE 512
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/*
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* How long we should hold a non-full packet before starting data gathering.
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*/
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#define PACKET_WAIT_TIME (HZ * 5 / 1000)
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/*
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* use drive write caching -- we need deferred error handling to be
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* able to sucessfully recover with this option (drive will return good
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* status as soon as the cdb is validated).
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*/
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#if defined(CONFIG_CDROM_PKTCDVD_WCACHE)
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#define USE_WCACHING 1
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#else
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#define USE_WCACHING 0
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#endif
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/*
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* No user-servicable parts beyond this point ->
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*/
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/*
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* device types
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*/
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#define PACKET_CDR 1
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#define PACKET_CDRW 2
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#define PACKET_DVDR 3
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#define PACKET_DVDRW 4
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/*
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* flags
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*/
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#define PACKET_WRITABLE 1 /* pd is writable */
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#define PACKET_NWA_VALID 2 /* next writable address valid */
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#define PACKET_LRA_VALID 3 /* last recorded address valid */
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#define PACKET_MERGE_SEGS 4 /* perform segment merging to keep */
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/* underlying cdrom device happy */
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/*
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* Disc status -- from READ_DISC_INFO
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*/
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#define PACKET_DISC_EMPTY 0
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#define PACKET_DISC_INCOMPLETE 1
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#define PACKET_DISC_COMPLETE 2
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#define PACKET_DISC_OTHER 3
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/*
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* write type, and corresponding data block type
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*/
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#define PACKET_MODE1 1
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#define PACKET_MODE2 2
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#define PACKET_BLOCK_MODE1 8
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#define PACKET_BLOCK_MODE2 10
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/*
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* Last session/border status
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*/
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#define PACKET_SESSION_EMPTY 0
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#define PACKET_SESSION_INCOMPLETE 1
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#define PACKET_SESSION_RESERVED 2
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#define PACKET_SESSION_COMPLETE 3
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#define PACKET_MCN "4a656e734178626f65323030300000"
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#undef PACKET_USE_LS
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#define PKT_CTRL_CMD_SETUP 0
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#define PKT_CTRL_CMD_TEARDOWN 1
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#define PKT_CTRL_CMD_STATUS 2
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struct pkt_ctrl_command {
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__u32 command; /* in: Setup, teardown, status */
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__u32 dev_index; /* in/out: Device index */
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__u32 dev; /* in/out: Device nr for cdrw device */
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__u32 pkt_dev; /* in/out: Device nr for packet device */
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__u32 num_devices; /* out: Largest device index + 1 */
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__u32 padding; /* Not used */
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};
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/*
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* packet ioctls
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*/
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#define PACKET_IOCTL_MAGIC ('X')
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#define PACKET_CTRL_CMD _IOWR(PACKET_IOCTL_MAGIC, 1, struct pkt_ctrl_command)
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#ifdef __KERNEL__
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#include <linux/blkdev.h>
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#include <linux/completion.h>
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#include <linux/cdrom.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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/* default bio write queue congestion marks */
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#define PKT_WRITE_CONGESTION_ON 10000
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#define PKT_WRITE_CONGESTION_OFF 9000
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struct packet_settings
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{
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__u32 size; /* packet size in (512 byte) sectors */
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__u8 fp; /* fixed packets */
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__u8 link_loss; /* the rest is specified
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* as per Mt Fuji */
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__u8 write_type;
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__u8 track_mode;
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__u8 block_mode;
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};
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/*
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* Very crude stats for now
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*/
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struct packet_stats
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{
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unsigned long pkt_started;
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unsigned long pkt_ended;
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unsigned long secs_w;
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unsigned long secs_rg;
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unsigned long secs_r;
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};
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struct packet_cdrw
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{
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struct list_head pkt_free_list;
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struct list_head pkt_active_list;
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spinlock_t active_list_lock; /* Serialize access to pkt_active_list */
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struct task_struct *thread;
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atomic_t pending_bios;
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};
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/*
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* Switch to high speed reading after reading this many kilobytes
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* with no interspersed writes.
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*/
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#define HI_SPEED_SWITCH 512
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struct packet_iosched
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{
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atomic_t attention; /* Set to non-zero when queue processing is needed */
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int writing; /* Non-zero when writing, zero when reading */
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spinlock_t lock; /* Protecting read/write queue manipulations */
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struct bio *read_queue;
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struct bio *read_queue_tail;
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struct bio *write_queue;
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struct bio *write_queue_tail;
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sector_t last_write; /* The sector where the last write ended */
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int successive_reads;
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};
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/*
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* 32 buffers of 2048 bytes
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*/
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#if (PAGE_SIZE % CD_FRAMESIZE) != 0
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#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
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#endif
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#define PACKET_MAX_SIZE 128
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#define FRAMES_PER_PAGE (PAGE_SIZE / CD_FRAMESIZE)
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#define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)
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enum packet_data_state {
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PACKET_IDLE_STATE, /* Not used at the moment */
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PACKET_WAITING_STATE, /* Waiting for more bios to arrive, so */
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/* we don't have to do as much */
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/* data gathering */
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PACKET_READ_WAIT_STATE, /* Waiting for reads to fill in holes */
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PACKET_WRITE_WAIT_STATE, /* Waiting for the write to complete */
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PACKET_RECOVERY_STATE, /* Recover after read/write errors */
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PACKET_FINISHED_STATE, /* After write has finished */
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PACKET_NUM_STATES /* Number of possible states */
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};
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/*
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* Information needed for writing a single packet
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*/
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struct pktcdvd_device;
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struct packet_data
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{
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struct list_head list;
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spinlock_t lock; /* Lock protecting state transitions and */
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/* orig_bios list */
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struct bio *orig_bios; /* Original bios passed to pkt_make_request */
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struct bio *orig_bios_tail;/* that will be handled by this packet */
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int write_size; /* Total size of all bios in the orig_bios */
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/* list, measured in number of frames */
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struct bio *w_bio; /* The bio we will send to the real CD */
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/* device once we have all data for the */
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/* packet we are going to write */
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sector_t sector; /* First sector in this packet */
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int frames; /* Number of frames in this packet */
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enum packet_data_state state; /* Current state */
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atomic_t run_sm; /* Incremented whenever the state */
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/* machine needs to be run */
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long sleep_time; /* Set this to non-zero to make the state */
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/* machine run after this many jiffies. */
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atomic_t io_wait; /* Number of pending IO operations */
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atomic_t io_errors; /* Number of read/write errors during IO */
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struct bio *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */
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struct page *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];
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int cache_valid; /* If non-zero, the data for the zone defined */
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/* by the sector variable is completely cached */
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/* in the pages[] vector. */
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int id; /* ID number for debugging */
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struct pktcdvd_device *pd;
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};
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struct pkt_rb_node {
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struct rb_node rb_node;
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struct bio *bio;
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};
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struct packet_stacked_data
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{
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struct bio *bio; /* Original read request bio */
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struct pktcdvd_device *pd;
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};
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#define PSD_POOL_SIZE 64
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struct pktcdvd_kobj
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{
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struct kobject kobj;
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struct pktcdvd_device *pd;
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};
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#define to_pktcdvdkobj(_k) \
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((struct pktcdvd_kobj*)container_of(_k,struct pktcdvd_kobj,kobj))
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struct pktcdvd_device
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{
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struct block_device *bdev; /* dev attached */
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dev_t pkt_dev; /* our dev */
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char name[20];
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struct packet_settings settings;
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struct packet_stats stats;
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int refcnt; /* Open count */
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int write_speed; /* current write speed, kB/s */
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int read_speed; /* current read speed, kB/s */
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unsigned long offset; /* start offset */
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__u8 mode_offset; /* 0 / 8 */
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__u8 type;
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unsigned long flags;
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__u16 mmc3_profile;
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__u32 nwa; /* next writable address */
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__u32 lra; /* last recorded address */
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struct packet_cdrw cdrw;
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wait_queue_head_t wqueue;
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spinlock_t lock; /* Serialize access to bio_queue */
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struct rb_root bio_queue; /* Work queue of bios we need to handle */
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int bio_queue_size; /* Number of nodes in bio_queue */
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sector_t current_sector; /* Keep track of where the elevator is */
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atomic_t scan_queue; /* Set to non-zero when pkt_handle_queue */
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/* needs to be run. */
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mempool_t *rb_pool; /* mempool for pkt_rb_node allocations */
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struct packet_iosched iosched;
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struct gendisk *disk;
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int write_congestion_off;
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int write_congestion_on;
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struct device *dev; /* sysfs pktcdvd[0-7] dev */
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struct pktcdvd_kobj *kobj_stat; /* sysfs pktcdvd[0-7]/stat/ */
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struct pktcdvd_kobj *kobj_wqueue; /* sysfs pktcdvd[0-7]/write_queue/ */
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struct dentry *dfs_d_root; /* debugfs: devname directory */
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struct dentry *dfs_f_info; /* debugfs: info file */
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};
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#endif /* __KERNEL__ */
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#endif /* __PKTCDVD_H */
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