drivers/s390/char/tape.h

   1 /*
   2  *    tape device driver for 3480/3490E/3590 tapes.
   3  *
   4  *  S390 and zSeries version
   5  *    Copyright IBM Corp. 2001, 2009
   6  *    Author(s): Carsten Otte <cotte@de.ibm.com>
   7  *               Tuan Ngo-Anh <ngoanh@de.ibm.com>
   8  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
   9  *               Stefan Bader <shbader@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/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/mtio.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/workqueue.h>
  23
  24 struct gendisk;
  25
  26 /*
  27  * Define DBF_LIKE_HELL for lots of messages in the debug feature.
  28  */
  29 #define DBF_LIKE_HELL
  30 #ifdef  DBF_LIKE_HELL
  31 #define DBF_LH(level, str, ...) \
  32 do { \
  33         debug_sprintf_event(TAPE_DBF_AREA, level, str, ## __VA_ARGS__); \
  34 } while (0)
  35 #else
  36 #define DBF_LH(level, str, ...) do {} while(0)
  37 #endif
  38
  39 /*
  40  * macros s390 debug feature (dbf)
  41  */
  42 #define DBF_EVENT(d_level, d_str...) \
  43 do { \
  44         debug_sprintf_event(TAPE_DBF_AREA, d_level, d_str); \
  45 } while (0)
  46
  47 #define DBF_EXCEPTION(d_level, d_str...) \
  48 do { \
  49         debug_sprintf_exception(TAPE_DBF_AREA, d_level, d_str); \
  50 } while (0)
  51
  52 #define TAPE_VERSION_MAJOR 2
  53 #define TAPE_VERSION_MINOR 0
  54 #define TAPE_MAGIC "tape"
  55
  56 #define TAPE_MINORS_PER_DEV 2       /* two minors per device */
  57 #define TAPEBLOCK_HSEC_SIZE     2048
  58 #define TAPEBLOCK_HSEC_S2B      2
  59 #define TAPEBLOCK_RETRIES       5
  60
  61 enum tape_medium_state {
  62         MS_UNKNOWN,
  63         MS_LOADED,
  64         MS_UNLOADED,
  65         MS_SIZE
  66 };
  67
  68 enum tape_state {
  69         TS_UNUSED=0,
  70         TS_IN_USE,
  71         TS_BLKUSE,
  72         TS_INIT,
  73         TS_NOT_OPER,
  74         TS_SIZE
  75 };
  76
  77 enum tape_op {
  78         TO_BLOCK,       /* Block read */
  79         TO_BSB,         /* Backward space block */
  80         TO_BSF,         /* Backward space filemark */
  81         TO_DSE,         /* Data security erase */
  82         TO_FSB,         /* Forward space block */
  83         TO_FSF,         /* Forward space filemark */
  84         TO_LBL,         /* Locate block label */
  85         TO_NOP,         /* No operation */
  86         TO_RBA,         /* Read backward */
  87         TO_RBI,         /* Read block information */
  88         TO_RFO,         /* Read forward */
  89         TO_REW,         /* Rewind tape */
  90         TO_RUN,         /* Rewind and unload tape */
  91         TO_WRI,         /* Write block */
  92         TO_WTM,         /* Write tape mark */
  93         TO_MSEN,        /* Medium sense */
  94         TO_LOAD,        /* Load tape */
  95         TO_READ_CONFIG, /* Read configuration data */
  96         TO_READ_ATTMSG, /* Read attention message */
  97         TO_DIS,         /* Tape display */
  98         TO_ASSIGN,      /* Assign tape to channel path */
  99         TO_UNASSIGN,    /* Unassign tape from channel path */
 100         TO_CRYPT_ON,    /* Enable encrpytion */
 101         TO_CRYPT_OFF,   /* Disable encrpytion */
 102         TO_KEKL_SET,    /* Set KEK label */
 103         TO_KEKL_QUERY,  /* Query KEK label */
 104         TO_RDC,         /* Read device characteristics */
 105         TO_SIZE,        /* #entries in tape_op_t */
 106 };
 107
 108 /* Forward declaration */
 109 struct tape_device;
 110
 111 /* tape_request->status can be: */
 112 enum tape_request_status {
 113         TAPE_REQUEST_INIT,      /* request is ready to be processed */
 114         TAPE_REQUEST_QUEUED,    /* request is queued to be processed */
 115         TAPE_REQUEST_IN_IO,     /* request is currently in IO */
 116         TAPE_REQUEST_DONE,      /* request is completed. */
 117         TAPE_REQUEST_CANCEL,    /* request should be canceled. */
 118         TAPE_REQUEST_LONG_BUSY, /* request has to be restarted after long busy */
 119 };
 120
 121 /* Tape CCW request */
 122 struct tape_request {
 123         struct list_head list;          /* list head for request queueing. */
 124         struct tape_device *device;     /* tape device of this request */
 125         struct ccw1 *cpaddr;            /* address of the channel program. */
 126         void *cpdata;                   /* pointer to ccw data. */
 127         enum tape_request_status status;/* status of this request */
 128         int options;                    /* options for execution. */
 129         int retries;                    /* retry counter for error recovery. */
 130         int rescnt;                     /* residual count from devstat. */
 131
 132         /* Callback for delivering final status. */
 133         void (*callback)(struct tape_request *, void *);
 134         void *callback_data;
 135
 136         enum tape_op op;
 137         int rc;
 138 };
 139
 140 /* Function type for magnetic tape commands */
 141 typedef int (*tape_mtop_fn)(struct tape_device *, int);
 142
 143 /* Size of the array containing the mtops for a discipline */
 144 #define TAPE_NR_MTOPS (MTMKPART+1)
 145
 146 /* Tape Discipline */
 147 struct tape_discipline {
 148         struct module *owner;
 149         int  (*setup_device)(struct tape_device *);
 150         void (*cleanup_device)(struct tape_device *);
 151         int (*irq)(struct tape_device *, struct tape_request *, struct irb *);
 152         struct tape_request *(*read_block)(struct tape_device *, size_t);
 153         struct tape_request *(*write_block)(struct tape_device *, size_t);
 154         void (*process_eov)(struct tape_device*);
 155         /* ioctl function for additional ioctls. */
 156         int (*ioctl_fn)(struct tape_device *, unsigned int, unsigned long);
 157         /* Array of tape commands with TAPE_NR_MTOPS entries */
 158         tape_mtop_fn *mtop_array;
 159 };
 160
 161 /*
 162  * The discipline irq function either returns an error code (<0) which
 163  * means that the request has failed with an error or one of the following:
 164  */
 165 #define TAPE_IO_SUCCESS         0       /* request successful */
 166 #define TAPE_IO_PENDING         1       /* request still running */
 167 #define TAPE_IO_RETRY           2       /* retry to current request */
 168 #define TAPE_IO_STOP            3       /* stop the running request */
 169 #define TAPE_IO_LONG_BUSY       4       /* delay 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 /* Tape Info */
 178 struct tape_device {
 179         /* entry in tape_device_list */
 180         struct list_head                node;
 181
 182         int                             cdev_id;
 183         struct ccw_device *             cdev;
 184         struct tape_class_device *      nt;
 185         struct tape_class_device *      rt;
 186
 187         /* Device mutex to serialize tape commands. */
 188         struct mutex                    mutex;
 189
 190         /* Device discipline information. */
 191         struct tape_discipline *        discipline;
 192         void *                          discdata;
 193
 194         /* Generic status flags */
 195         long                            tape_generic_status;
 196
 197         /* Device state information. */
 198         wait_queue_head_t               state_change_wq;
 199         enum tape_state                 tape_state;
 200         enum tape_medium_state          medium_state;
 201         unsigned char *                 modeset_byte;
 202
 203         /* Reference count. */
 204         atomic_t                        ref_count;
 205
 206         /* Request queue. */
 207         struct list_head                req_queue;
 208
 209         /* Request wait queue. */
 210         wait_queue_head_t               wait_queue;
 211
 212         /* Each tape device has (currently) two minor numbers. */
 213         int                             first_minor;
 214
 215         /* Number of tapemarks required for correct termination. */
 216         int                             required_tapemarks;
 217
 218         /* Block ID of the BOF */
 219         unsigned int                    bof;
 220
 221         /* Character device frontend data */
 222         struct tape_char_data           char_data;
 223
 224         /* Function to start or stop the next request later. */
 225         struct delayed_work             tape_dnr;
 226
 227         /* Timer for long busy */
 228         struct timer_list               lb_timeout;
 229
 230 };
 231
 232 /* Externals from tape_core.c */
 233 extern struct tape_request *tape_alloc_request(int cplength, int datasize);
 234 extern void tape_free_request(struct tape_request *);
 235 extern int tape_do_io(struct tape_device *, struct tape_request *);
 236 extern int tape_do_io_async(struct tape_device *, struct tape_request *);
 237 extern int tape_do_io_interruptible(struct tape_device *, struct tape_request *);
 238 extern int tape_cancel_io(struct tape_device *, struct tape_request *);
 239 void tape_hotplug_event(struct tape_device *, int major, int action);
 240
 241 static inline int
 242 tape_do_io_free(struct tape_device *device, struct tape_request *request)
 243 {
 244         int rc;
 245
 246         rc = tape_do_io(device, request);
 247         tape_free_request(request);
 248         return rc;
 249 }
 250
 251 static inline void
 252 tape_do_io_async_free(struct tape_device *device, struct tape_request *request)
 253 {
 254         request->callback = (void *) tape_free_request;
 255         request->callback_data = NULL;
 256         tape_do_io_async(device, request);
 257 }
 258
 259 extern int tape_oper_handler(int irq, int status);
 260 extern void tape_noper_handler(int irq, int status);
 261 extern int tape_open(struct tape_device *);
 262 extern int tape_release(struct tape_device *);
 263 extern int tape_mtop(struct tape_device *, int, int);
 264 extern void tape_state_set(struct tape_device *, enum tape_state);
 265
 266 extern int tape_generic_online(struct tape_device *, struct tape_discipline *);
 267 extern int tape_generic_offline(struct ccw_device *);
 268 extern int tape_generic_pm_suspend(struct ccw_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_find_device(int devindex);
 275 extern struct tape_device *tape_get_device(struct tape_device *);
 276 extern void 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 /* tape initialisation functions */
 285 #ifdef CONFIG_PROC_FS
 286 extern void tape_proc_init (void);
 287 extern void tape_proc_cleanup (void);
 288 #else
 289 static inline void tape_proc_init (void) {;}
 290 static inline void tape_proc_cleanup (void) {;}
 291 #endif
 292
 293 /* a function for dumping device sense info */
 294 extern void tape_dump_sense_dbf(struct tape_device *, struct tape_request *,
 295                                 struct irb *);
 296
 297 /* functions for handling the status of a device */
 298 extern void tape_med_state_set(struct tape_device *, enum tape_medium_state);
 299
 300 /* The debug area */
 301 extern debug_info_t *TAPE_DBF_AREA;
 302
 303 /* functions for building ccws */
 304 static inline struct ccw1 *
 305 tape_ccw_cc(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda)
 306 {
 307         ccw->cmd_code = cmd_code;
 308         ccw->flags = CCW_FLAG_CC;
 309         ccw->count = memsize;
 310         ccw->cda = (__u32)(addr_t) cda;
 311         return ccw + 1;
 312 }
 313
 314 static inline struct ccw1 *
 315 tape_ccw_end(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda)
 316 {
 317         ccw->cmd_code = cmd_code;
 318         ccw->flags = 0;
 319         ccw->count = memsize;
 320         ccw->cda = (__u32)(addr_t) cda;
 321         return ccw + 1;
 322 }
 323
 324 static inline struct ccw1 *
 325 tape_ccw_cmd(struct ccw1 *ccw, __u8 cmd_code)
 326 {
 327         ccw->cmd_code = cmd_code;
 328         ccw->flags = 0;
 329         ccw->count = 0;
 330         ccw->cda = (__u32)(addr_t) &ccw->cmd_code;
 331         return ccw + 1;
 332 }
 333
 334 static inline struct ccw1 *
 335 tape_ccw_repeat(struct ccw1 *ccw, __u8 cmd_code, int count)
 336 {
 337         while (count-- > 0) {
 338                 ccw->cmd_code = cmd_code;
 339                 ccw->flags = CCW_FLAG_CC;
 340                 ccw->count = 0;
 341                 ccw->cda = (__u32)(addr_t) &ccw->cmd_code;
 342                 ccw++;
 343         }
 344         return ccw;
 345 }
 346
 347 static inline struct ccw1 *
 348 tape_ccw_cc_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal)
 349 {
 350         ccw->cmd_code = cmd_code;
 351         ccw->flags    = CCW_FLAG_CC;
 352         idal_buffer_set_cda(idal, ccw);
 353         return ccw++;
 354 }
 355
 356 static inline struct ccw1 *
 357 tape_ccw_end_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal)
 358 {
 359         ccw->cmd_code = cmd_code;
 360         ccw->flags    = 0;
 361         idal_buffer_set_cda(idal, ccw);
 362         return ccw++;
 363 }
 364
 365 /* Global vars */
 366 extern const char *tape_state_verbose[];
 367 extern const char *tape_op_verbose[];
 368
 369 #endif /* for ifdef tape.h */