drivers/s390/char/tape.h

   1 /*
   2  *  drivers/s390/char/tape.h
   3  *    tape device driver for 3480/3490E/3590 tapes.
   4  *
   5  *  S390 and zSeries version
   6  *    Copyright (C) 2001,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
   8  *               Tuan Ngo-Anh <ngoanh@de.ibm.com>
   9  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
  10  *               Stefan Bader <shbader@de.ibm.com>
  11  */
  12
  13 #ifndef _TAPE_H
  14 #define _TAPE_H
  15
  16 #include <asm/ccwdev.h>
  17 #include <asm/debug.h>
  18 #include <asm/idals.h>
  19 #include <linux/config.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/mtio.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/workqueue.h>
  26
  27 struct gendisk;
  28
  29 /*
  30  * Define DBF_LIKE_HELL for lots of messages in the debug feature.
  31  */
  32 #define DBF_LIKE_HELL
  33 #ifdef  DBF_LIKE_HELL
  34 #define DBF_LH(level, str, ...) \
  35 do { \
  36         debug_sprintf_event(TAPE_DBF_AREA, level, str, ## __VA_ARGS__); \
  37 } while (0)
  38 #else
  39 #define DBF_LH(level, str, ...) do {} while(0)
  40 #endif
  41
  42 /*
  43  * macros s390 debug feature (dbf)
  44  */
  45 #define DBF_EVENT(d_level, d_str...) \
  46 do { \
  47         debug_sprintf_event(TAPE_DBF_AREA, d_level, d_str); \
  48 } while (0)
  49
  50 #define DBF_EXCEPTION(d_level, d_str...) \
  51 do { \
  52         debug_sprintf_exception(TAPE_DBF_AREA, d_level, d_str); \
  53 } while (0)
  54
  55 #define TAPE_VERSION_MAJOR 2
  56 #define TAPE_VERSION_MINOR 0
  57 #define TAPE_MAGIC "tape"
  58
  59 #define TAPE_MINORS_PER_DEV 2       /* two minors per device */
  60 #define TAPEBLOCK_HSEC_SIZE     2048
  61 #define TAPEBLOCK_HSEC_S2B      2
  62 #define TAPEBLOCK_RETRIES       5
  63
  64 enum tape_medium_state {
  65         MS_UNKNOWN,
  66         MS_LOADED,
  67         MS_UNLOADED,
  68         MS_SIZE
  69 };
  70
  71 enum tape_state {
  72         TS_UNUSED=0,
  73         TS_IN_USE,
  74         TS_BLKUSE,
  75         TS_INIT,
  76         TS_NOT_OPER,
  77         TS_SIZE
  78 };
  79
  80 enum tape_op {
  81         TO_BLOCK,       /* Block read */
  82         TO_BSB,         /* Backward space block */
  83         TO_BSF,         /* Backward space filemark */
  84         TO_DSE,         /* Data security erase */
  85         TO_FSB,         /* Forward space block */
  86         TO_FSF,         /* Forward space filemark */
  87         TO_LBL,         /* Locate block label */
  88         TO_NOP,         /* No operation */
  89         TO_RBA,         /* Read backward */
  90         TO_RBI,         /* Read block information */
  91         TO_RFO,         /* Read forward */
  92         TO_REW,         /* Rewind tape */
  93         TO_RUN,         /* Rewind and unload tape */
  94         TO_WRI,         /* Write block */
  95         TO_WTM,         /* Write tape mark */
  96         TO_MSEN,        /* Medium sense */
  97         TO_LOAD,        /* Load tape */
  98         TO_READ_CONFIG, /* Read configuration data */
  99         TO_READ_ATTMSG, /* Read attention message */
 100         TO_DIS,         /* Tape display */
 101         TO_ASSIGN,      /* Assign tape to channel path */
 102         TO_UNASSIGN,    /* Unassign tape from channel path */
 103         TO_SIZE         /* #entries in tape_op_t */
 104 };
 105
 106 /* Forward declaration */
 107 struct tape_device;
 108
 109 /* tape_request->status can be: */
 110 enum tape_request_status {
 111         TAPE_REQUEST_INIT,      /* request is ready to be processed */
 112         TAPE_REQUEST_QUEUED,    /* request is queued to be processed */
 113         TAPE_REQUEST_IN_IO,     /* request is currently in IO */
 114         TAPE_REQUEST_DONE,      /* request is completed. */
 115         TAPE_REQUEST_CANCEL,    /* request should be canceled. */
 116 };
 117
 118 /* Tape CCW request */
 119 struct tape_request {
 120         struct list_head list;          /* list head for request queueing. */
 121         struct tape_device *device;     /* tape device of this request */
 122         struct ccw1 *cpaddr;            /* address of the channel program. */
 123         void *cpdata;                   /* pointer to ccw data. */
 124         enum tape_request_status status;/* status of this request */
 125         int options;                    /* options for execution. */
 126         int retries;                    /* retry counter for error recovery. */
 127         int rescnt;                     /* residual count from devstat. */
 128
 129         /* Callback for delivering final status. */
 130         void (*callback)(struct tape_request *, void *);
 131         void *callback_data;
 132
 133         enum tape_op op;
 134         int rc;
 135 };
 136
 137 /* Function type for magnetic tape commands */
 138 typedef int (*tape_mtop_fn)(struct tape_device *, int);
 139
 140 /* Size of the array containing the mtops for a discipline */
 141 #define TAPE_NR_MTOPS (MTMKPART+1)
 142
 143 /* Tape Discipline */
 144 struct tape_discipline {
 145         struct module *owner;
 146         int  (*setup_device)(struct tape_device *);
 147         void (*cleanup_device)(struct tape_device *);
 148         int (*irq)(struct tape_device *, struct tape_request *, struct irb *);
 149         struct tape_request *(*read_block)(struct tape_device *, size_t);
 150         struct tape_request *(*write_block)(struct tape_device *, size_t);
 151         void (*process_eov)(struct tape_device*);
 152 #ifdef CONFIG_S390_TAPE_BLOCK
 153         /* Block device stuff. */
 154         struct tape_request *(*bread)(struct tape_device *, struct request *);
 155         void (*check_locate)(struct tape_device *, struct tape_request *);
 156         void (*free_bread)(struct tape_request *);
 157 #endif
 158         /* ioctl function for additional ioctls. */
 159         int (*ioctl_fn)(struct tape_device *, unsigned int, unsigned long);
 160         /* Array of tape commands with TAPE_NR_MTOPS entries */
 161         tape_mtop_fn *mtop_array;
 162 };
 163
 164 /*
 165  * The discipline irq function either returns an error code (<0) which
 166  * means that the request has failed with an error or one of the following:
 167  */
 168 #define TAPE_IO_SUCCESS 0       /* request successful */
 169 #define TAPE_IO_PENDING 1       /* request still running */
 170 #define TAPE_IO_RETRY   2       /* retry to current request */
 171 #define TAPE_IO_STOP    3       /* stop the running request */
 172
 173 /* Char Frontend Data */
 174 struct tape_char_data {
 175         struct idal_buffer *idal_buf;   /* idal buffer for user char data */
 176         int block_size;                 /*   of size block_size. */
 177 };
 178
 179 #ifdef CONFIG_S390_TAPE_BLOCK
 180 /* Block Frontend Data */
 181 struct tape_blk_data
 182 {
 183         /* Block device request queue. */
 184         request_queue_t *       request_queue;
 185         spinlock_t              request_queue_lock;
 186
 187         /* Task to move entries from block request to CCS request queue. */
 188         struct work_struct      requeue_task;
 189         atomic_t                requeue_scheduled;
 190
 191         /* Current position on the tape. */
 192         long                    block_position;
 193         int                     medium_changed;
 194         struct gendisk *        disk;
 195 };
 196 #endif
 197
 198 /* Tape Info */
 199 struct tape_device {
 200         /* entry in tape_device_list */
 201         struct list_head                node;
 202
 203         int                             cdev_id;
 204         struct ccw_device *             cdev;
 205         struct tape_class_device *      nt;
 206         struct tape_class_device *      rt;
 207
 208         /* Device discipline information. */
 209         struct tape_discipline *        discipline;
 210         void *                          discdata;
 211
 212         /* Generic status flags */
 213         long                            tape_generic_status;
 214
 215         /* Device state information. */
 216         wait_queue_head_t               state_change_wq;
 217         enum tape_state                 tape_state;
 218         enum tape_medium_state          medium_state;
 219         unsigned char *                 modeset_byte;
 220
 221         /* Reference count. */
 222         atomic_t                        ref_count;
 223
 224         /* Request queue. */
 225         struct list_head                req_queue;
 226
 227         /* Each tape device has (currently) two minor numbers. */
 228         int                             first_minor;
 229
 230         /* Number of tapemarks required for correct termination. */
 231         int                             required_tapemarks;
 232
 233         /* Block ID of the BOF */
 234         unsigned int                    bof;
 235
 236         /* Character device frontend data */
 237         struct tape_char_data           char_data;
 238 #ifdef CONFIG_S390_TAPE_BLOCK
 239         /* Block dev frontend data */
 240         struct tape_blk_data            blk_data;
 241 #endif
 242
 243         /* Function to start or stop the next request later. */
 244         struct work_struct              tape_dnr;
 245 };
 246
 247 /* Externals from tape_core.c */
 248 extern struct tape_request *tape_alloc_request(int cplength, int datasize);
 249 extern void tape_free_request(struct tape_request *);
 250 extern int tape_do_io(struct tape_device *, struct tape_request *);
 251 extern int tape_do_io_async(struct tape_device *, struct tape_request *);
 252 extern int tape_do_io_interruptible(struct tape_device *, struct tape_request *);
 253 void tape_hotplug_event(struct tape_device *, int major, int action);
 254
 255 static inline int
 256 tape_do_io_free(struct tape_device *device, struct tape_request *request)
 257 {
 258         int rc;
 259
 260         rc = tape_do_io(device, request);
 261         tape_free_request(request);
 262         return rc;
 263 }
 264
 265 extern int tape_oper_handler(int irq, int status);
 266 extern void tape_noper_handler(int irq, int status);
 267 extern int tape_open(struct tape_device *);
 268 extern int tape_release(struct tape_device *);
 269 extern int tape_mtop(struct tape_device *, int, int);
 270 extern void tape_state_set(struct tape_device *, enum tape_state);
 271
 272 extern int tape_generic_online(struct tape_device *, struct tape_discipline *);
 273 extern int tape_generic_offline(struct tape_device *device);
 274
 275 /* Externals from tape_devmap.c */
 276 extern int tape_generic_probe(struct ccw_device *);
 277 extern void tape_generic_remove(struct ccw_device *);
 278
 279 extern struct tape_device *tape_get_device(int devindex);
 280 extern struct tape_device *tape_get_device_reference(struct tape_device *);
 281 extern struct tape_device *tape_put_device(struct tape_device *);
 282
 283 /* Externals from tape_char.c */
 284 extern int tapechar_init(void);
 285 extern void tapechar_exit(void);
 286 extern int  tapechar_setup_device(struct tape_device *);
 287 extern void tapechar_cleanup_device(struct tape_device *);
 288
 289 /* Externals from tape_block.c */
 290 #ifdef CONFIG_S390_TAPE_BLOCK
 291 extern int tapeblock_init (void);
 292 extern void tapeblock_exit(void);
 293 extern int tapeblock_setup_device(struct tape_device *);
 294 extern void tapeblock_cleanup_device(struct tape_device *);
 295 #else
 296 static inline int tapeblock_init (void) {return 0;}
 297 static inline void tapeblock_exit (void) {;}
 298 static inline int tapeblock_setup_device(struct tape_device *t) {return 0;}
 299 static inline void tapeblock_cleanup_device (struct tape_device *t) {;}
 300 #endif
 301
 302 /* tape initialisation functions */
 303 #ifdef CONFIG_PROC_FS
 304 extern void tape_proc_init (void);
 305 extern void tape_proc_cleanup (void);
 306 #else
 307 static inline void tape_proc_init (void) {;}
 308 static inline void tape_proc_cleanup (void) {;}
 309 #endif
 310
 311 /* a function for dumping device sense info */
 312 extern void tape_dump_sense(struct tape_device *, struct tape_request *,
 313                             struct irb *);
 314 extern void tape_dump_sense_dbf(struct tape_device *, struct tape_request *,
 315                                 struct irb *);
 316
 317 /* functions for handling the status of a device */
 318 extern void tape_med_state_set(struct tape_device *, enum tape_medium_state);
 319
 320 /* The debug area */
 321 extern debug_info_t *TAPE_DBF_AREA;
 322
 323 /* functions for building ccws */
 324 static inline struct ccw1 *
 325 tape_ccw_cc(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda)
 326 {
 327         ccw->cmd_code = cmd_code;
 328         ccw->flags = CCW_FLAG_CC;
 329         ccw->count = memsize;
 330         ccw->cda = (__u32)(addr_t) cda;
 331         return ccw + 1;
 332 }
 333
 334 static inline struct ccw1 *
 335 tape_ccw_end(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda)
 336 {
 337         ccw->cmd_code = cmd_code;
 338         ccw->flags = 0;
 339         ccw->count = memsize;
 340         ccw->cda = (__u32)(addr_t) cda;
 341         return ccw + 1;
 342 }
 343
 344 static inline struct ccw1 *
 345 tape_ccw_cmd(struct ccw1 *ccw, __u8 cmd_code)
 346 {
 347         ccw->cmd_code = cmd_code;
 348         ccw->flags = 0;
 349         ccw->count = 0;
 350         ccw->cda = (__u32)(addr_t) &ccw->cmd_code;
 351         return ccw + 1;
 352 }
 353
 354 static inline struct ccw1 *
 355 tape_ccw_repeat(struct ccw1 *ccw, __u8 cmd_code, int count)
 356 {
 357         while (count-- > 0) {
 358                 ccw->cmd_code = cmd_code;
 359                 ccw->flags = CCW_FLAG_CC;
 360                 ccw->count = 0;
 361                 ccw->cda = (__u32)(addr_t) &ccw->cmd_code;
 362                 ccw++;
 363         }
 364         return ccw;
 365 }
 366
 367 static inline struct ccw1 *
 368 tape_ccw_cc_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal)
 369 {
 370         ccw->cmd_code = cmd_code;
 371         ccw->flags    = CCW_FLAG_CC;
 372         idal_buffer_set_cda(idal, ccw);
 373         return ccw++;
 374 }
 375
 376 static inline struct ccw1 *
 377 tape_ccw_end_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal)
 378 {
 379         ccw->cmd_code = cmd_code;
 380         ccw->flags    = 0;
 381         idal_buffer_set_cda(idal, ccw);
 382         return ccw++;
 383 }
 384
 385 /* Global vars */
 386 extern const char *tape_state_verbose[];
 387 extern const char *tape_op_verbose[];
 388
 389 #endif /* for ifdef tape.h */