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/blkdev.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/mtio.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/workqueue.h>
  24
  25 struct gendisk;
  26
  27 /*
  28  * Define DBF_LIKE_HELL for lots of messages in the debug feature.
  29  */
  30 #define DBF_LIKE_HELL
  31 #ifdef  DBF_LIKE_HELL
  32 #define DBF_LH(level, str, ...) \
  33 do { \
  34         debug_sprintf_event(TAPE_DBF_AREA, level, str, ## __VA_ARGS__); \
  35 } while (0)
  36 #else
  37 #define DBF_LH(level, str, ...) do {} while(0)
  38 #endif
  39
  40 /*
  41  * macros s390 debug feature (dbf)
  42  */
  43 #define DBF_EVENT(d_level, d_str...) \
  44 do { \
  45         debug_sprintf_event(TAPE_DBF_AREA, d_level, d_str); \
  46 } while (0)
  47
  48 #define DBF_EXCEPTION(d_level, d_str...) \
  49 do { \
  50         debug_sprintf_exception(TAPE_DBF_AREA, d_level, d_str); \
  51 } while (0)
  52
  53 #define TAPE_VERSION_MAJOR 2
  54 #define TAPE_VERSION_MINOR 0
  55 #define TAPE_MAGIC "tape"
  56
  57 #define TAPE_MINORS_PER_DEV 2       /* two minors per device */
  58 #define TAPEBLOCK_HSEC_SIZE     2048
  59 #define TAPEBLOCK_HSEC_S2B      2
  60 #define TAPEBLOCK_RETRIES       5
  61
  62 enum tape_medium_state {
  63         MS_UNKNOWN,
  64         MS_LOADED,
  65         MS_UNLOADED,
  66         MS_SIZE
  67 };
  68
  69 enum tape_state {
  70         TS_UNUSED=0,
  71         TS_IN_USE,
  72         TS_BLKUSE,
  73         TS_INIT,
  74         TS_NOT_OPER,
  75         TS_SIZE
  76 };
  77
  78 enum tape_op {
  79         TO_BLOCK,       /* Block read */
  80         TO_BSB,         /* Backward space block */
  81         TO_BSF,         /* Backward space filemark */
  82         TO_DSE,         /* Data security erase */
  83         TO_FSB,         /* Forward space block */
  84         TO_FSF,         /* Forward space filemark */
  85         TO_LBL,         /* Locate block label */
  86         TO_NOP,         /* No operation */
  87         TO_RBA,         /* Read backward */
  88         TO_RBI,         /* Read block information */
  89         TO_RFO,         /* Read forward */
  90         TO_REW,         /* Rewind tape */
  91         TO_RUN,         /* Rewind and unload tape */
  92         TO_WRI,         /* Write block */
  93         TO_WTM,         /* Write tape mark */
  94         TO_MSEN,        /* Medium sense */
  95         TO_LOAD,        /* Load tape */
  96         TO_READ_CONFIG, /* Read configuration data */
  97         TO_READ_ATTMSG, /* Read attention message */
  98         TO_DIS,         /* Tape display */
  99         TO_ASSIGN,      /* Assign tape to channel path */
 100         TO_UNASSIGN,    /* Unassign tape from channel path */
 101         TO_CRYPT_ON,    /* Enable encrpytion */
 102         TO_CRYPT_OFF,   /* Disable encrpytion */
 103         TO_KEKL_SET,    /* Set KEK label */
 104         TO_KEKL_QUERY,  /* Query KEK label */
 105         TO_RDC,         /* Read device characteristics */
 106         TO_SIZE,        /* #entries in tape_op_t */
 107 };
 108
 109 /* Forward declaration */
 110 struct tape_device;
 111
 112 /* tape_request->status can be: */
 113 enum tape_request_status {
 114         TAPE_REQUEST_INIT,      /* request is ready to be processed */
 115         TAPE_REQUEST_QUEUED,    /* request is queued to be processed */
 116         TAPE_REQUEST_IN_IO,     /* request is currently in IO */
 117         TAPE_REQUEST_DONE,      /* request is completed. */
 118         TAPE_REQUEST_CANCEL,    /* request should be canceled. */
 119         TAPE_REQUEST_LONG_BUSY, /* request has to be restarted after long busy */
 120 };
 121
 122 /* Tape CCW request */
 123 struct tape_request {
 124         struct list_head list;          /* list head for request queueing. */
 125         struct tape_device *device;     /* tape device of this request */
 126         struct ccw1 *cpaddr;            /* address of the channel program. */
 127         void *cpdata;                   /* pointer to ccw data. */
 128         enum tape_request_status status;/* status of this request */
 129         int options;                    /* options for execution. */
 130         int retries;                    /* retry counter for error recovery. */
 131         int rescnt;                     /* residual count from devstat. */
 132
 133         /* Callback for delivering final status. */
 134         void (*callback)(struct tape_request *, void *);
 135         void *callback_data;
 136
 137         enum tape_op op;
 138         int rc;
 139 };
 140
 141 /* Function type for magnetic tape commands */
 142 typedef int (*tape_mtop_fn)(struct tape_device *, int);
 143
 144 /* Size of the array containing the mtops for a discipline */
 145 #define TAPE_NR_MTOPS (MTMKPART+1)
 146
 147 /* Tape Discipline */
 148 struct tape_discipline {
 149         struct module *owner;
 150         int  (*setup_device)(struct tape_device *);
 151         void (*cleanup_device)(struct tape_device *);
 152         int (*irq)(struct tape_device *, struct tape_request *, struct irb *);
 153         struct tape_request *(*read_block)(struct tape_device *, size_t);
 154         struct tape_request *(*write_block)(struct tape_device *, size_t);
 155         void (*process_eov)(struct tape_device*);
 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 #define TAPE_IO_LONG_BUSY       4       /* delay the running request */
 171
 172 /* Char Frontend Data */
 173 struct tape_char_data {
 174         struct idal_buffer *idal_buf;   /* idal buffer for user char data */
 175         int block_size;                 /*   of size block_size. */
 176 };
 177
 178 /* Tape Info */
 179 struct tape_device {
 180         /* entry in tape_device_list */
 181         struct list_head                node;
 182
 183         int                             cdev_id;
 184         struct ccw_device *             cdev;
 185         struct tape_class_device *      nt;
 186         struct tape_class_device *      rt;
 187
 188         /* Device mutex to serialize tape commands. */
 189         struct mutex                    mutex;
 190
 191         /* Device discipline information. */
 192         struct tape_discipline *        discipline;
 193         void *                          discdata;
 194
 195         /* Generic status flags */
 196         long                            tape_generic_status;
 197
 198         /* Device state information. */
 199         wait_queue_head_t               state_change_wq;
 200         enum tape_state                 tape_state;
 201         enum tape_medium_state          medium_state;
 202         unsigned char *                 modeset_byte;
 203
 204         /* Reference count. */
 205         atomic_t                        ref_count;
 206
 207         /* Request queue. */
 208         struct list_head                req_queue;
 209
 210         /* Request wait queue. */
 211         wait_queue_head_t               wait_queue;
 212
 213         /* Each tape device has (currently) two minor numbers. */
 214         int                             first_minor;
 215
 216         /* Number of tapemarks required for correct termination. */
 217         int                             required_tapemarks;
 218
 219         /* Block ID of the BOF */
 220         unsigned int                    bof;
 221
 222         /* Character device frontend data */
 223         struct tape_char_data           char_data;
 224
 225         /* Function to start or stop the next request later. */
 226         struct delayed_work             tape_dnr;
 227
 228         /* Timer for long busy */
 229         struct timer_list               lb_timeout;
 230
 231 };
 232
 233 /* Externals from tape_core.c */
 234 extern struct tape_request *tape_alloc_request(int cplength, int datasize);
 235 extern void tape_free_request(struct tape_request *);
 236 extern int tape_do_io(struct tape_device *, struct tape_request *);
 237 extern int tape_do_io_async(struct tape_device *, struct tape_request *);
 238 extern int tape_do_io_interruptible(struct tape_device *, struct tape_request *);
 239 extern int tape_cancel_io(struct tape_device *, struct tape_request *);
 240 void tape_hotplug_event(struct tape_device *, int major, int action);
 241
 242 static inline int
 243 tape_do_io_free(struct tape_device *device, struct tape_request *request)
 244 {
 245         int rc;
 246
 247         rc = tape_do_io(device, request);
 248         tape_free_request(request);
 249         return rc;
 250 }
 251
 252 static inline void
 253 tape_do_io_async_free(struct tape_device *device, struct tape_request *request)
 254 {
 255         request->callback = (void *) tape_free_request;
 256         request->callback_data = NULL;
 257         tape_do_io_async(device, request);
 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 ccw_device *);
 269 extern int tape_generic_pm_suspend(struct ccw_device *);
 270
 271 /* Externals from tape_devmap.c */
 272 extern int tape_generic_probe(struct ccw_device *);
 273 extern void tape_generic_remove(struct ccw_device *);
 274
 275 extern struct tape_device *tape_find_device(int devindex);
 276 extern struct tape_device *tape_get_device(struct tape_device *);
 277 extern void tape_put_device(struct tape_device *);
 278
 279 /* Externals from tape_char.c */
 280 extern int tapechar_init(void);
 281 extern void tapechar_exit(void);
 282 extern int  tapechar_setup_device(struct tape_device *);
 283 extern void tapechar_cleanup_device(struct tape_device *);
 284
 285 /* tape initialisation functions */
 286 #ifdef CONFIG_PROC_FS
 287 extern void tape_proc_init (void);
 288 extern void tape_proc_cleanup (void);
 289 #else
 290 static inline void tape_proc_init (void) {;}
 291 static inline void tape_proc_cleanup (void) {;}
 292 #endif
 293
 294 /* a function for dumping device sense info */
 295 extern void tape_dump_sense_dbf(struct tape_device *, struct tape_request *,
 296                                 struct irb *);
 297
 298 /* functions for handling the status of a device */
 299 extern void tape_med_state_set(struct tape_device *, enum tape_medium_state);
 300
 301 /* The debug area */
 302 extern debug_info_t *TAPE_DBF_AREA;
 303
 304 /* functions for building ccws */
 305 static inline struct ccw1 *
 306 tape_ccw_cc(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda)
 307 {
 308         ccw->cmd_code = cmd_code;
 309         ccw->flags = CCW_FLAG_CC;
 310         ccw->count = memsize;
 311         ccw->cda = (__u32)(addr_t) cda;
 312         return ccw + 1;
 313 }
 314
 315 static inline struct ccw1 *
 316 tape_ccw_end(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda)
 317 {
 318         ccw->cmd_code = cmd_code;
 319         ccw->flags = 0;
 320         ccw->count = memsize;
 321         ccw->cda = (__u32)(addr_t) cda;
 322         return ccw + 1;
 323 }
 324
 325 static inline struct ccw1 *
 326 tape_ccw_cmd(struct ccw1 *ccw, __u8 cmd_code)
 327 {
 328         ccw->cmd_code = cmd_code;
 329         ccw->flags = 0;
 330         ccw->count = 0;
 331         ccw->cda = (__u32)(addr_t) &ccw->cmd_code;
 332         return ccw + 1;
 333 }
 334
 335 static inline struct ccw1 *
 336 tape_ccw_repeat(struct ccw1 *ccw, __u8 cmd_code, int count)
 337 {
 338         while (count-- > 0) {
 339                 ccw->cmd_code = cmd_code;
 340                 ccw->flags = CCW_FLAG_CC;
 341                 ccw->count = 0;
 342                 ccw->cda = (__u32)(addr_t) &ccw->cmd_code;
 343                 ccw++;
 344         }
 345         return ccw;
 346 }
 347
 348 static inline struct ccw1 *
 349 tape_ccw_cc_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal)
 350 {
 351         ccw->cmd_code = cmd_code;
 352         ccw->flags    = CCW_FLAG_CC;
 353         idal_buffer_set_cda(idal, ccw);
 354         return ccw++;
 355 }
 356
 357 static inline struct ccw1 *
 358 tape_ccw_end_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal)
 359 {
 360         ccw->cmd_code = cmd_code;
 361         ccw->flags    = 0;
 362         idal_buffer_set_cda(idal, ccw);
 363         return ccw++;
 364 }
 365
 366 /* Global vars */
 367 extern const char *tape_state_verbose[];
 368 extern const char *tape_op_verbose[];
 369
 370 #endif /* for ifdef tape.h */