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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/s390/char/tape.h | |
download | linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/s390/char/tape.h')
-rw-r--r-- | drivers/s390/char/tape.h | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h new file mode 100644 index 000000000000..d04e6c2c3cc1 --- /dev/null +++ b/drivers/s390/char/tape.h @@ -0,0 +1,384 @@ +/* + * drivers/s390/char/tape.h + * tape device driver for 3480/3490E/3590 tapes. + * + * S390 and zSeries version + * Copyright (C) 2001,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Author(s): Carsten Otte <cotte@de.ibm.com> + * Tuan Ngo-Anh <ngoanh@de.ibm.com> + * Martin Schwidefsky <schwidefsky@de.ibm.com> + */ + +#ifndef _TAPE_H +#define _TAPE_H + +#include <asm/ccwdev.h> +#include <asm/debug.h> +#include <asm/idals.h> +#include <linux/config.h> +#include <linux/blkdev.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mtio.h> +#include <linux/interrupt.h> +#include <linux/workqueue.h> + +struct gendisk; + +/* + * Define DBF_LIKE_HELL for lots of messages in the debug feature. + */ +#define DBF_LIKE_HELL +#ifdef DBF_LIKE_HELL +#define DBF_LH(level, str, ...) \ +do { \ + debug_sprintf_event(TAPE_DBF_AREA, level, str, ## __VA_ARGS__); \ +} while (0) +#else +#define DBF_LH(level, str, ...) do {} while(0) +#endif + +/* + * macros s390 debug feature (dbf) + */ +#define DBF_EVENT(d_level, d_str...) \ +do { \ + debug_sprintf_event(TAPE_DBF_AREA, d_level, d_str); \ +} while (0) + +#define DBF_EXCEPTION(d_level, d_str...) \ +do { \ + debug_sprintf_exception(TAPE_DBF_AREA, d_level, d_str); \ +} while (0) + +#define TAPE_VERSION_MAJOR 2 +#define TAPE_VERSION_MINOR 0 +#define TAPE_MAGIC "tape" + +#define TAPE_MINORS_PER_DEV 2 /* two minors per device */ +#define TAPEBLOCK_HSEC_SIZE 2048 +#define TAPEBLOCK_HSEC_S2B 2 +#define TAPEBLOCK_RETRIES 5 + +enum tape_medium_state { + MS_UNKNOWN, + MS_LOADED, + MS_UNLOADED, + MS_SIZE +}; + +enum tape_state { + TS_UNUSED=0, + TS_IN_USE, + TS_BLKUSE, + TS_INIT, + TS_NOT_OPER, + TS_SIZE +}; + +enum tape_op { + TO_BLOCK, /* Block read */ + TO_BSB, /* Backward space block */ + TO_BSF, /* Backward space filemark */ + TO_DSE, /* Data security erase */ + TO_FSB, /* Forward space block */ + TO_FSF, /* Forward space filemark */ + TO_LBL, /* Locate block label */ + TO_NOP, /* No operation */ + TO_RBA, /* Read backward */ + TO_RBI, /* Read block information */ + TO_RFO, /* Read forward */ + TO_REW, /* Rewind tape */ + TO_RUN, /* Rewind and unload tape */ + TO_WRI, /* Write block */ + TO_WTM, /* Write tape mark */ + TO_MSEN, /* Medium sense */ + TO_LOAD, /* Load tape */ + TO_READ_CONFIG, /* Read configuration data */ + TO_READ_ATTMSG, /* Read attention message */ + TO_DIS, /* Tape display */ + TO_ASSIGN, /* Assign tape to channel path */ + TO_UNASSIGN, /* Unassign tape from channel path */ + TO_SIZE /* #entries in tape_op_t */ +}; + +/* Forward declaration */ +struct tape_device; + +/* tape_request->status can be: */ +enum tape_request_status { + TAPE_REQUEST_INIT, /* request is ready to be processed */ + TAPE_REQUEST_QUEUED, /* request is queued to be processed */ + TAPE_REQUEST_IN_IO, /* request is currently in IO */ + TAPE_REQUEST_DONE, /* request is completed. */ +}; + +/* Tape CCW request */ +struct tape_request { + struct list_head list; /* list head for request queueing. */ + struct tape_device *device; /* tape device of this request */ + struct ccw1 *cpaddr; /* address of the channel program. */ + void *cpdata; /* pointer to ccw data. */ + enum tape_request_status status;/* status of this request */ + int options; /* options for execution. */ + int retries; /* retry counter for error recovery. */ + int rescnt; /* residual count from devstat. */ + + /* Callback for delivering final status. */ + void (*callback)(struct tape_request *, void *); + void *callback_data; + + enum tape_op op; + int rc; +}; + +/* Function type for magnetic tape commands */ +typedef int (*tape_mtop_fn)(struct tape_device *, int); + +/* Size of the array containing the mtops for a discipline */ +#define TAPE_NR_MTOPS (MTMKPART+1) + +/* Tape Discipline */ +struct tape_discipline { + struct module *owner; + int (*setup_device)(struct tape_device *); + void (*cleanup_device)(struct tape_device *); + int (*irq)(struct tape_device *, struct tape_request *, struct irb *); + struct tape_request *(*read_block)(struct tape_device *, size_t); + struct tape_request *(*write_block)(struct tape_device *, size_t); + void (*process_eov)(struct tape_device*); +#ifdef CONFIG_S390_TAPE_BLOCK + /* Block device stuff. */ + struct tape_request *(*bread)(struct tape_device *, struct request *); + void (*check_locate)(struct tape_device *, struct tape_request *); + void (*free_bread)(struct tape_request *); +#endif + /* ioctl function for additional ioctls. */ + int (*ioctl_fn)(struct tape_device *, unsigned int, unsigned long); + /* Array of tape commands with TAPE_NR_MTOPS entries */ + tape_mtop_fn *mtop_array; +}; + +/* + * The discipline irq function either returns an error code (<0) which + * means that the request has failed with an error or one of the following: + */ +#define TAPE_IO_SUCCESS 0 /* request successful */ +#define TAPE_IO_PENDING 1 /* request still running */ +#define TAPE_IO_RETRY 2 /* retry to current request */ +#define TAPE_IO_STOP 3 /* stop the running request */ + +/* Char Frontend Data */ +struct tape_char_data { + struct idal_buffer *idal_buf; /* idal buffer for user char data */ + int block_size; /* of size block_size. */ +}; + +#ifdef CONFIG_S390_TAPE_BLOCK +/* Block Frontend Data */ +struct tape_blk_data +{ + /* Block device request queue. */ + request_queue_t * request_queue; + spinlock_t request_queue_lock; + + /* Task to move entries from block request to CCS request queue. */ + struct work_struct requeue_task; + atomic_t requeue_scheduled; + + /* Current position on the tape. */ + long block_position; + int medium_changed; + struct gendisk * disk; +}; +#endif + +/* Tape Info */ +struct tape_device { + /* entry in tape_device_list */ + struct list_head node; + + int cdev_id; + struct ccw_device * cdev; + struct tape_class_device * nt; + struct tape_class_device * rt; + + /* Device discipline information. */ + struct tape_discipline * discipline; + void * discdata; + + /* Generic status flags */ + long tape_generic_status; + + /* Device state information. */ + wait_queue_head_t state_change_wq; + enum tape_state tape_state; + enum tape_medium_state medium_state; + unsigned char * modeset_byte; + + /* Reference count. */ + atomic_t ref_count; + + /* Request queue. */ + struct list_head req_queue; + + /* Each tape device has (currently) two minor numbers. */ + int first_minor; + + /* Number of tapemarks required for correct termination. */ + int required_tapemarks; + + /* Block ID of the BOF */ + unsigned int bof; + + /* Character device frontend data */ + struct tape_char_data char_data; +#ifdef CONFIG_S390_TAPE_BLOCK + /* Block dev frontend data */ + struct tape_blk_data blk_data; +#endif +}; + +/* Externals from tape_core.c */ +extern struct tape_request *tape_alloc_request(int cplength, int datasize); +extern void tape_free_request(struct tape_request *); +extern int tape_do_io(struct tape_device *, struct tape_request *); +extern int tape_do_io_async(struct tape_device *, struct tape_request *); +extern int tape_do_io_interruptible(struct tape_device *, struct tape_request *); +void tape_hotplug_event(struct tape_device *, int major, int action); + +static inline int +tape_do_io_free(struct tape_device *device, struct tape_request *request) +{ + int rc; + + rc = tape_do_io(device, request); + tape_free_request(request); + return rc; +} + +extern int tape_oper_handler(int irq, int status); +extern void tape_noper_handler(int irq, int status); +extern int tape_open(struct tape_device *); +extern int tape_release(struct tape_device *); +extern int tape_mtop(struct tape_device *, int, int); +extern void tape_state_set(struct tape_device *, enum tape_state); + +extern int tape_generic_online(struct tape_device *, struct tape_discipline *); +extern int tape_generic_offline(struct tape_device *device); + +/* Externals from tape_devmap.c */ +extern int tape_generic_probe(struct ccw_device *); +extern void tape_generic_remove(struct ccw_device *); + +extern struct tape_device *tape_get_device(int devindex); +extern struct tape_device *tape_get_device_reference(struct tape_device *); +extern struct tape_device *tape_put_device(struct tape_device *); + +/* Externals from tape_char.c */ +extern int tapechar_init(void); +extern void tapechar_exit(void); +extern int tapechar_setup_device(struct tape_device *); +extern void tapechar_cleanup_device(struct tape_device *); + +/* Externals from tape_block.c */ +#ifdef CONFIG_S390_TAPE_BLOCK +extern int tapeblock_init (void); +extern void tapeblock_exit(void); +extern int tapeblock_setup_device(struct tape_device *); +extern void tapeblock_cleanup_device(struct tape_device *); +#else +static inline int tapeblock_init (void) {return 0;} +static inline void tapeblock_exit (void) {;} +static inline int tapeblock_setup_device(struct tape_device *t) {return 0;} +static inline void tapeblock_cleanup_device (struct tape_device *t) {;} +#endif + +/* tape initialisation functions */ +#ifdef CONFIG_PROC_FS +extern void tape_proc_init (void); +extern void tape_proc_cleanup (void); +#else +static inline void tape_proc_init (void) {;} +static inline void tape_proc_cleanup (void) {;} +#endif + +/* a function for dumping device sense info */ +extern void tape_dump_sense(struct tape_device *, struct tape_request *, + struct irb *); +extern void tape_dump_sense_dbf(struct tape_device *, struct tape_request *, + struct irb *); + +/* functions for handling the status of a device */ +extern void tape_med_state_set(struct tape_device *, enum tape_medium_state); + +/* The debug area */ +extern debug_info_t *TAPE_DBF_AREA; + +/* functions for building ccws */ +static inline struct ccw1 * +tape_ccw_cc(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda) +{ + ccw->cmd_code = cmd_code; + ccw->flags = CCW_FLAG_CC; + ccw->count = memsize; + ccw->cda = (__u32)(addr_t) cda; + return ccw + 1; +} + +static inline struct ccw1 * +tape_ccw_end(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda) +{ + ccw->cmd_code = cmd_code; + ccw->flags = 0; + ccw->count = memsize; + ccw->cda = (__u32)(addr_t) cda; + return ccw + 1; +} + +static inline struct ccw1 * +tape_ccw_cmd(struct ccw1 *ccw, __u8 cmd_code) +{ + ccw->cmd_code = cmd_code; + ccw->flags = 0; + ccw->count = 0; + ccw->cda = (__u32)(addr_t) &ccw->cmd_code; + return ccw + 1; +} + +static inline struct ccw1 * +tape_ccw_repeat(struct ccw1 *ccw, __u8 cmd_code, int count) +{ + while (count-- > 0) { + ccw->cmd_code = cmd_code; + ccw->flags = CCW_FLAG_CC; + ccw->count = 0; + ccw->cda = (__u32)(addr_t) &ccw->cmd_code; + ccw++; + } + return ccw; +} + +static inline struct ccw1 * +tape_ccw_cc_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal) +{ + ccw->cmd_code = cmd_code; + ccw->flags = CCW_FLAG_CC; + idal_buffer_set_cda(idal, ccw); + return ccw++; +} + +static inline struct ccw1 * +tape_ccw_end_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal) +{ + ccw->cmd_code = cmd_code; + ccw->flags = 0; + idal_buffer_set_cda(idal, ccw); + return ccw++; +} + +/* Global vars */ +extern const char *tape_state_verbose[]; +extern const char *tape_op_verbose[]; + +#endif /* for ifdef tape.h */ |