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) 2001,2002 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  */
  11
  12 #ifndef _TAPE_H
  13 #define _TAPE_H
  14
  15 #include <asm/ccwdev.h>
  16 #include <asm/debug.h>
  17 #include <asm/idals.h>
  18 #include <linux/config.h>
  19 #include <linux/blkdev.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/mtio.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/workqueue.h>
  25
  26 struct gendisk;
  27
  28 /*
  29  * Define DBF_LIKE_HELL for lots of messages in the debug feature.
  30  */
  31 #define DBF_LIKE_HELL
  32 #ifdef  DBF_LIKE_HELL
  33 #define DBF_LH(level, str, ...) \
  34 do { \
  35         debug_sprintf_event(TAPE_DBF_AREA, level, str, ## __VA_ARGS__); \
  36 } while (0)
  37 #else
  38 #define DBF_LH(level, str, ...) do {} while(0)
  39 #endif
  40
  41 /*
  42  * macros s390 debug feature (dbf)
  43  */
  44 #define DBF_EVENT(d_level, d_str...) \
  45 do { \
  46         debug_sprintf_event(TAPE_DBF_AREA, d_level, d_str); \
  47 } while (0)
  48
  49 #define DBF_EXCEPTION(d_level, d_str...) \
  50 do { \
  51         debug_sprintf_exception(TAPE_DBF_AREA, d_level, d_str); \
  52 } while (0)
  53
  54 #define TAPE_VERSION_MAJOR 2
  55 #define TAPE_VERSION_MINOR 0
  56 #define TAPE_MAGIC "tape"
  57
  58 #define TAPE_MINORS_PER_DEV 2       /* two minors per device */
  59 #define TAPEBLOCK_HSEC_SIZE     2048
  60 #define TAPEBLOCK_HSEC_S2B      2
  61 #define TAPEBLOCK_RETRIES       5
  62
  63 enum tape_medium_state {
  64         MS_UNKNOWN,
  65         MS_LOADED,
  66         MS_UNLOADED,
  67         MS_SIZE
  68 };
  69
  70 enum tape_state {
  71         TS_UNUSED=0,
  72         TS_IN_USE,
  73         TS_BLKUSE,
  74         TS_INIT,
  75         TS_NOT_OPER,
  76         TS_SIZE
  77 };
  78
  79 enum tape_op {
  80         TO_BLOCK,       /* Block read */
  81         TO_BSB,         /* Backward space block */
  82         TO_BSF,         /* Backward space filemark */
  83         TO_DSE,         /* Data security erase */
  84         TO_FSB,         /* Forward space block */
  85         TO_FSF,         /* Forward space filemark */
  86         TO_LBL,         /* Locate block label */
  87         TO_NOP,         /* No operation */
  88         TO_RBA,         /* Read backward */
  89         TO_RBI,         /* Read block information */
  90         TO_RFO,         /* Read forward */
  91         TO_REW,         /* Rewind tape */
  92         TO_RUN,         /* Rewind and unload tape */
  93         TO_WRI,         /* Write block */
  94         TO_WTM,         /* Write tape mark */
  95         TO_MSEN,        /* Medium sense */
  96         TO_LOAD,        /* Load tape */
  97         TO_READ_CONFIG, /* Read configuration data */
  98         TO_READ_ATTMSG, /* Read attention message */
  99         TO_DIS,         /* Tape display */
 100         TO_ASSIGN,      /* Assign tape to channel path */
 101         TO_UNASSIGN,    /* Unassign tape from channel path */
 102         TO_SIZE         /* #entries in tape_op_t */
 103 };
 104
 105 /* Forward declaration */
 106 struct tape_device;
 107
 108 /* tape_request->status can be: */
 109 enum tape_request_status {
 110         TAPE_REQUEST_INIT,      /* request is ready to be processed */
 111         TAPE_REQUEST_QUEUED,    /* request is queued to be processed */
 112         TAPE_REQUEST_IN_IO,     /* request is currently in IO */
 113         TAPE_REQUEST_DONE,      /* request is completed. */
 114 };
 115
 116 /* Tape CCW request */
 117 struct tape_request {
 118         struct list_head list;          /* list head for request queueing. */
 119         struct tape_device *device;     /* tape device of this request */
 120         struct ccw1 *cpaddr;            /* address of the channel program. */
 121         void *cpdata;                   /* pointer to ccw data. */
 122         enum tape_request_status status;/* status of this request */
 123         int options;                    /* options for execution. */
 124         int retries;                    /* retry counter for error recovery. */
 125         int rescnt;                     /* residual count from devstat. */
 126
 127         /* Callback for delivering final status. */
 128         void (*callback)(struct tape_request *, void *);
 129         void *callback_data;
 130
 131         enum tape_op op;
 132         int rc;
 133 };
 134
 135 /* Function type for magnetic tape commands */
 136 typedef int (*tape_mtop_fn)(struct tape_device *, int);
 137
 138 /* Size of the array containing the mtops for a discipline */
 139 #define TAPE_NR_MTOPS (MTMKPART+1)
 140
 141 /* Tape Discipline */
 142 struct tape_discipline {
 143         struct module *owner;
 144         int  (*setup_device)(struct tape_device *);
 145         void (*cleanup_device)(struct tape_device *);
 146         int (*irq)(struct tape_device *, struct tape_request *, struct irb *);
 147         struct tape_request *(*read_block)(struct tape_device *, size_t);
 148         struct tape_request *(*write_block)(struct tape_device *, size_t);
 149         void (*process_eov)(struct tape_device*);
 150 #ifdef CONFIG_S390_TAPE_BLOCK
 151         /* Block device stuff. */
 152         struct tape_request *(*bread)(struct tape_device *, struct request *);
 153         void (*check_locate)(struct tape_device *, struct tape_request *);
 154         void (*free_bread)(struct tape_request *);
 155 #endif
 156         /* ioctl function for additional ioctls. */
 157         int (*ioctl_fn)(struct tape_device *, unsigned int, unsigned long);
 158         /* Array of tape commands with TAPE_NR_MTOPS entries */
 159         tape_mtop_fn *mtop_array;
 160 };
 161
 162 /*
 163  * The discipline irq function either returns an error code (<0) which
 164  * means that the request has failed with an error or one of the following:
 165  */
 166 #define TAPE_IO_SUCCESS 0       /* request successful */
 167 #define TAPE_IO_PENDING 1       /* request still running */
 168 #define TAPE_IO_RETRY   2       /* retry to current request */
 169 #define TAPE_IO_STOP    3       /* stop the running request */
 170
 171 /* Char Frontend Data */
 172 struct tape_char_data {
 173         struct idal_buffer *idal_buf;   /* idal buffer for user char data */
 174         int block_size;                 /*   of size block_size. */
 175 };
 176
 177 #ifdef CONFIG_S390_TAPE_BLOCK
 178 /* Block Frontend Data */
 179 struct tape_blk_data
 180 {
 181         /* Block device request queue. */
 182         request_queue_t *       request_queue;
 183         spinlock_t              request_queue_lock;
 184
 185         /* Task to move entries from block request to CCS request queue. */
 186         struct work_struct      requeue_task;
 187         atomic_t                requeue_scheduled;
 188
 189         /* Current position on the tape. */
 190         long                    block_position;
 191         int                     medium_changed;
 192         struct gendisk *        disk;
 193 };
 194 #endif
 195
 196 /* Tape Info */
 197 struct tape_device {
 198         /* entry in tape_device_list */
 199         struct list_head                node;
 200
 201         int                             cdev_id;
 202         struct ccw_device *             cdev;
 203         struct tape_class_device *      nt;
 204         struct tape_class_device *      rt;
 205
 206         /* Device discipline information. */
 207         struct tape_discipline *        discipline;
 208         void *                          discdata;
 209
 210         /* Generic status flags */
 211         long                            tape_generic_status;
 212
 213         /* Device state information. */
 214         wait_queue_head_t               state_change_wq;
 215         enum tape_state                 tape_state;
 216         enum tape_medium_state          medium_state;
 217         unsigned char *                 modeset_byte;
 218
 219         /* Reference count. */
 220         atomic_t                        ref_count;
 221
 222         /* Request queue. */
 223         struct list_head                req_queue;
 224
 225         /* Each tape device has (currently) two minor numbers. */
 226         int                             first_minor;
 227
 228         /* Number of tapemarks required for correct termination. */
 229         int                             required_tapemarks;
 230
 231         /* Block ID of the BOF */
 232         unsigned int                    bof;
 233
 234         /* Character device frontend data */
 235         struct tape_char_data           char_data;
 236 #ifdef CONFIG_S390_TAPE_BLOCK
 237         /* Block dev frontend data */
 238         struct tape_blk_data            blk_data;
 239 #endif
 240 };
 241
 242 /* Externals from tape_core.c */
 243 extern struct tape_request *tape_alloc_request(int cplength, int datasize);
 244 extern void tape_free_request(struct tape_request *);
 245 extern int tape_do_io(struct tape_device *, struct tape_request *);
 246 extern int tape_do_io_async(struct tape_device *, struct tape_request *);
 247 extern int tape_do_io_interruptible(struct tape_device *, struct tape_request *);
 248 void tape_hotplug_event(struct tape_device *, int major, int action);
 249
 250 static inline int
 251 tape_do_io_free(struct tape_device *device, struct tape_request *request)
 252 {
 253         int rc;
 254
 255         rc = tape_do_io(device, request);
 256         tape_free_request(request);
 257         return rc;
 258 }
 259
 260 extern int tape_oper_handler(int irq, int status);
 261 extern void tape_noper_handler(int irq, int status);
 262 extern int tape_open(struct tape_device *);
 263 extern int tape_release(struct tape_device *);
 264 extern int tape_mtop(struct tape_device *, int, int);
 265 extern void tape_state_set(struct tape_device *, enum tape_state);
 266
 267 extern int tape_generic_online(struct tape_device *, struct tape_discipline *);
 268 extern int tape_generic_offline(struct tape_device *device);
 269
 270 /* Externals from tape_devmap.c */
 271 extern int tape_generic_probe(struct ccw_device *);
 272 extern void tape_generic_remove(struct ccw_device *);
 273
 274 extern struct tape_device *tape_get_device(int devindex);
 275 extern struct tape_device *tape_get_device_reference(struct tape_device *);
 276 extern struct tape_device *tape_put_device(struct tape_device *);
 277
 278 /* Externals from tape_char.c */
 279 extern int tapechar_init(void);
 280 extern void tapechar_exit(void);
 281 extern int  tapechar_setup_device(struct tape_device *);
 282 extern void tapechar_cleanup_device(struct tape_device *);
 283
 284 /* Externals from tape_block.c */
 285 #ifdef CONFIG_S390_TAPE_BLOCK
 286 extern int tapeblock_init (void);
 287 extern void tapeblock_exit(void);
 288 extern int tapeblock_setup_device(struct tape_device *);
 289 extern void tapeblock_cleanup_device(struct tape_device *);
 290 #else
 291 static inline int tapeblock_init (void) {return 0;}
 292 static inline void tapeblock_exit (void) {;}
 293 static inline int tapeblock_setup_device(struct tape_device *t) {return 0;}
 294 static inline void tapeblock_cleanup_device (struct tape_device *t) {;}
 295 #endif
 296
 297 /* tape initialisation functions */
 298 #ifdef CONFIG_PROC_FS
 299 extern void tape_proc_init (void);
 300 extern void tape_proc_cleanup (void);
 301 #else
 302 static inline void tape_proc_init (void) {;}
 303 static inline void tape_proc_cleanup (void) {;}
 304 #endif
 305
 306 /* a function for dumping device sense info */
 307 extern void tape_dump_sense(struct tape_device *, struct tape_request *,
 308                             struct irb *);
 309 extern void tape_dump_sense_dbf(struct tape_device *, struct tape_request *,
 310                                 struct irb *);
 311
 312 /* functions for handling the status of a device */
 313 extern void tape_med_state_set(struct tape_device *, enum tape_medium_state);
 314
 315 /* The debug area */
 316 extern debug_info_t *TAPE_DBF_AREA;
 317
 318 /* functions for building ccws */
 319 static inline struct ccw1 *
 320 tape_ccw_cc(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda)
 321 {
 322         ccw->cmd_code = cmd_code;
 323         ccw->flags = CCW_FLAG_CC;
 324         ccw->count = memsize;
 325         ccw->cda = (__u32)(addr_t) cda;
 326         return ccw + 1;
 327 }
 328
 329 static inline struct ccw1 *
 330 tape_ccw_end(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda)
 331 {
 332         ccw->cmd_code = cmd_code;
 333         ccw->flags = 0;
 334         ccw->count = memsize;
 335         ccw->cda = (__u32)(addr_t) cda;
 336         return ccw + 1;
 337 }
 338
 339 static inline struct ccw1 *
 340 tape_ccw_cmd(struct ccw1 *ccw, __u8 cmd_code)
 341 {
 342         ccw->cmd_code = cmd_code;
 343         ccw->flags = 0;
 344         ccw->count = 0;
 345         ccw->cda = (__u32)(addr_t) &ccw->cmd_code;
 346         return ccw + 1;
 347 }
 348
 349 static inline struct ccw1 *
 350 tape_ccw_repeat(struct ccw1 *ccw, __u8 cmd_code, int count)
 351 {
 352         while (count-- > 0) {
 353                 ccw->cmd_code = cmd_code;
 354                 ccw->flags = CCW_FLAG_CC;
 355                 ccw->count = 0;
 356                 ccw->cda = (__u32)(addr_t) &ccw->cmd_code;
 357                 ccw++;
 358         }
 359         return ccw;
 360 }
 361
 362 static inline struct ccw1 *
 363 tape_ccw_cc_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal)
 364 {
 365         ccw->cmd_code = cmd_code;
 366         ccw->flags    = CCW_FLAG_CC;
 367         idal_buffer_set_cda(idal, ccw);
 368         return ccw++;
 369 }
 370
 371 static inline struct ccw1 *
 372 tape_ccw_end_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal)
 373 {
 374         ccw->cmd_code = cmd_code;
 375         ccw->flags    = 0;
 376         idal_buffer_set_cda(idal, ccw);
 377         return ccw++;
 378 }
 379
 380 /* Global vars */
 381 extern const char *tape_state_verbose[];
 382 extern const char *tape_op_verbose[];
 383
 384 #endif /* for ifdef tape.h */