drivers/s390/block/dasd_int.h

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_int.h
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999, 2009
   8  */
   9
  10 #ifndef DASD_INT_H
  11 #define DASD_INT_H
  12
  13 #ifdef __KERNEL__
  14
  15 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
  16 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
  17 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
  18
  19 /*
  20  * States a dasd device can have:
  21  *   new: the dasd_device structure is allocated.
  22  *   known: the discipline for the device is identified.
  23  *   basic: the device can do basic i/o.
  24  *   unfmt: the device could not be analyzed (format is unknown).
  25  *   ready: partition detection is done and the device is can do block io.
  26  *   online: the device accepts requests from the block device queue.
  27  *
  28  * Things to do for startup state transitions:
  29  *   new -> known: find discipline for the device and create devfs entries.
  30  *   known -> basic: request irq line for the device.
  31  *   basic -> ready: do the initial analysis, e.g. format detection,
  32  *                   do block device setup and detect partitions.
  33  *   ready -> online: schedule the device tasklet.
  34  * Things to do for shutdown state transitions:
  35  *   online -> ready: just set the new device state.
  36  *   ready -> basic: flush requests from the block device layer, clear
  37  *                   partition information and reset format information.
  38  *   basic -> known: terminate all requests and free irq.
  39  *   known -> new: remove devfs entries and forget discipline.
  40  */
  41
  42 #define DASD_STATE_NEW    0
  43 #define DASD_STATE_KNOWN  1
  44 #define DASD_STATE_BASIC  2
  45 #define DASD_STATE_UNFMT  3
  46 #define DASD_STATE_READY  4
  47 #define DASD_STATE_ONLINE 5
  48
  49 #include <linux/module.h>
  50 #include <linux/wait.h>
  51 #include <linux/blkdev.h>
  52 #include <linux/genhd.h>
  53 #include <linux/hdreg.h>
  54 #include <linux/interrupt.h>
  55 #include <linux/log2.h>
  56 #include <asm/ccwdev.h>
  57 #include <linux/workqueue.h>
  58 #include <asm/debug.h>
  59 #include <asm/dasd.h>
  60 #include <asm/idals.h>
  61
  62 /* DASD discipline magic */
  63 #define DASD_ECKD_MAGIC 0xC5C3D2C4
  64 #define DASD_DIAG_MAGIC 0xC4C9C1C7
  65 #define DASD_FBA_MAGIC 0xC6C2C140
  66
  67 /*
  68  * SECTION: Type definitions
  69  */
  70 struct dasd_device;
  71 struct dasd_block;
  72
  73 /* BIT DEFINITIONS FOR SENSE DATA */
  74 #define DASD_SENSE_BIT_0 0x80
  75 #define DASD_SENSE_BIT_1 0x40
  76 #define DASD_SENSE_BIT_2 0x20
  77 #define DASD_SENSE_BIT_3 0x10
  78
  79 /* BIT DEFINITIONS FOR SIM SENSE */
  80 #define DASD_SIM_SENSE 0x0F
  81 #define DASD_SIM_MSG_TO_OP 0x03
  82 #define DASD_SIM_LOG 0x0C
  83
  84 /* lock class for nested cdev lock */
  85 #define CDEV_NESTED_FIRST 1
  86 #define CDEV_NESTED_SECOND 2
  87
  88 /*
  89  * SECTION: MACROs for klogd and s390 debug feature (dbf)
  90  */
  91 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
  92 do { \
  93         debug_sprintf_event(d_device->debug_area, \
  94                             d_level, \
  95                             d_str "\n", \
  96                             d_data); \
  97 } while(0)
  98
  99 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
 100 do { \
 101         debug_sprintf_exception(d_device->debug_area, \
 102                                 d_level, \
 103                                 d_str "\n", \
 104                                 d_data); \
 105 } while(0)
 106
 107 #define DBF_EVENT(d_level, d_str, d_data...)\
 108 do { \
 109         debug_sprintf_event(dasd_debug_area, \
 110                             d_level,\
 111                             d_str "\n", \
 112                             d_data); \
 113 } while(0)
 114
 115 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...)      \
 116 do { \
 117         struct ccw_dev_id __dev_id;                     \
 118         ccw_device_get_id(d_cdev, &__dev_id);           \
 119         debug_sprintf_event(dasd_debug_area,            \
 120                             d_level,                                    \
 121                             "0.%x.%04x " d_str "\n",                    \
 122                             __dev_id.ssid, __dev_id.devno, d_data);     \
 123 } while (0)
 124
 125 #define DBF_EXC(d_level, d_str, d_data...)\
 126 do { \
 127         debug_sprintf_exception(dasd_debug_area, \
 128                                 d_level,\
 129                                 d_str "\n", \
 130                                 d_data); \
 131 } while(0)
 132
 133 /* limit size for an errorstring */
 134 #define ERRORLENGTH 30
 135
 136 /* definition of dbf debug levels */
 137 #define DBF_EMERG       0       /* system is unusable                   */
 138 #define DBF_ALERT       1       /* action must be taken immediately     */
 139 #define DBF_CRIT        2       /* critical conditions                  */
 140 #define DBF_ERR         3       /* error conditions                     */
 141 #define DBF_WARNING     4       /* warning conditions                   */
 142 #define DBF_NOTICE      5       /* normal but significant condition     */
 143 #define DBF_INFO        6       /* informational                        */
 144 #define DBF_DEBUG       6       /* debug-level messages                 */
 145
 146 /* messages to be written via klogd and dbf */
 147 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
 148 do { \
 149         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 150                dev_name(&d_device->cdev->dev), d_args); \
 151         DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
 152 } while(0)
 153
 154 #define MESSAGE(d_loglevel,d_string,d_args...)\
 155 do { \
 156         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 157         DBF_EVENT(DBF_ALERT, d_string, d_args); \
 158 } while(0)
 159
 160 /* messages to be written via klogd only */
 161 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
 162 do { \
 163         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 164                dev_name(&d_device->cdev->dev), d_args); \
 165 } while(0)
 166
 167 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
 168 do { \
 169         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 170 } while(0)
 171
 172 struct dasd_ccw_req {
 173         unsigned int magic;             /* Eye catcher */
 174         struct list_head devlist;       /* for dasd_device request queue */
 175         struct list_head blocklist;     /* for dasd_block request queue */
 176
 177         /* Where to execute what... */
 178         struct dasd_block *block;       /* the originating block device */
 179         struct dasd_device *memdev;     /* the device used to allocate this */
 180         struct dasd_device *startdev;   /* device the request is started on */
 181         void *cpaddr;                   /* address of ccw or tcw */
 182         unsigned char cpmode;           /* 0 = cmd mode, 1 = itcw */
 183         char status;                    /* status of this request */
 184         short retries;                  /* A retry counter */
 185         unsigned long flags;            /* flags of this request */
 186
 187         /* ... and how */
 188         unsigned long starttime;        /* jiffies time of request start */
 189         unsigned long expires;          /* expiration period in jiffies */
 190         char lpm;                       /* logical path mask */
 191         void *data;                     /* pointer to data area */
 192
 193         /* these are important for recovering erroneous requests          */
 194         int intrc;                      /* internal error, e.g. from start_IO */
 195         struct irb irb;                 /* device status in case of an error */
 196         struct dasd_ccw_req *refers;    /* ERP-chain queueing. */
 197         void *function;                 /* originating ERP action */
 198
 199         /* these are for statistics only */
 200         unsigned long long buildclk;    /* TOD-clock of request generation */
 201         unsigned long long startclk;    /* TOD-clock of request start */
 202         unsigned long long stopclk;     /* TOD-clock of request interrupt */
 203         unsigned long long endclk;      /* TOD-clock of request termination */
 204
 205         /* Callback that is called after reaching final status. */
 206         void (*callback)(struct dasd_ccw_req *, void *data);
 207         void *callback_data;
 208 };
 209
 210 /*
 211  * dasd_ccw_req -> status can be:
 212  */
 213 #define DASD_CQR_FILLED         0x00    /* request is ready to be processed */
 214 #define DASD_CQR_DONE           0x01    /* request is completed successfully */
 215 #define DASD_CQR_NEED_ERP       0x02    /* request needs recovery action */
 216 #define DASD_CQR_IN_ERP         0x03    /* request is in recovery */
 217 #define DASD_CQR_FAILED         0x04    /* request is finally failed */
 218 #define DASD_CQR_TERMINATED     0x05    /* request was stopped by driver */
 219
 220 #define DASD_CQR_QUEUED         0x80    /* request is queued to be processed */
 221 #define DASD_CQR_IN_IO          0x81    /* request is currently in IO */
 222 #define DASD_CQR_ERROR          0x82    /* request is completed with error */
 223 #define DASD_CQR_CLEAR_PENDING  0x83    /* request is clear pending */
 224 #define DASD_CQR_CLEARED        0x84    /* request was cleared */
 225 #define DASD_CQR_SUCCESS        0x85    /* request was successful */
 226
 227 /* default expiration time*/
 228 #define DASD_EXPIRES      300
 229 #define DASD_EXPIRES_MAX  40000000
 230
 231 /* per dasd_ccw_req flags */
 232 #define DASD_CQR_FLAGS_USE_ERP   0      /* use ERP for this request */
 233 #define DASD_CQR_FLAGS_FAILFAST  1      /* FAILFAST */
 234 #define DASD_CQR_VERIFY_PATH     2      /* path verification request */
 235 #define DASD_CQR_ALLOW_SLOCK     3      /* Try this request even when lock was
 236                                          * stolen. Should not be combined with
 237                                          * DASD_CQR_FLAGS_USE_ERP
 238                                          */
 239
 240 /* Signature for error recovery functions. */
 241 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
 242
 243 /*
 244  * Unique identifier for dasd device.
 245  */
 246 #define UA_NOT_CONFIGURED  0x00
 247 #define UA_BASE_DEVICE     0x01
 248 #define UA_BASE_PAV_ALIAS  0x02
 249 #define UA_HYPER_PAV_ALIAS 0x03
 250
 251 struct dasd_uid {
 252         __u8 type;
 253         char vendor[4];
 254         char serial[15];
 255         __u16 ssid;
 256         __u8 real_unit_addr;
 257         __u8 base_unit_addr;
 258         char vduit[33];
 259 };
 260
 261 /*
 262  * the struct dasd_discipline is
 263  * sth like a table of virtual functions, if you think of dasd_eckd
 264  * inheriting dasd...
 265  * no, currently we are not planning to reimplement the driver in C++
 266  */
 267 struct dasd_discipline {
 268         struct module *owner;
 269         char ebcname[8];        /* a name used for tagging and printks */
 270         char name[8];           /* a name used for tagging and printks */
 271         int max_blocks;         /* maximum number of blocks to be chained */
 272
 273         struct list_head list;  /* used for list of disciplines */
 274
 275         /*
 276          * Device recognition functions. check_device is used to verify
 277          * the sense data and the information returned by read device
 278          * characteristics. It returns 0 if the discipline can be used
 279          * for the device in question. uncheck_device is called during
 280          * device shutdown to deregister a device from its discipline.
 281          */
 282         int (*check_device) (struct dasd_device *);
 283         void (*uncheck_device) (struct dasd_device *);
 284
 285         /*
 286          * do_analysis is used in the step from device state "basic" to
 287          * state "accept". It returns 0 if the device can be made ready,
 288          * it returns -EMEDIUMTYPE if the device can't be made ready or
 289          * -EAGAIN if do_analysis started a ccw that needs to complete
 290          * before the analysis may be repeated.
 291          */
 292         int (*do_analysis) (struct dasd_block *);
 293
 294         /*
 295          * This function is called, when new paths become available.
 296          * Disciplins may use this callback to do necessary setup work,
 297          * e.g. verify that new path is compatible with the current
 298          * configuration.
 299          */
 300         int (*verify_path)(struct dasd_device *, __u8);
 301
 302         /*
 303          * Last things to do when a device is set online, and first things
 304          * when it is set offline.
 305          */
 306         int (*ready_to_online) (struct dasd_device *);
 307         int (*online_to_ready) (struct dasd_device *);
 308
 309         /*
 310          * Device operation functions. build_cp creates a ccw chain for
 311          * a block device request, start_io starts the request and
 312          * term_IO cancels it (e.g. in case of a timeout). format_device
 313          * returns a ccw chain to be used to format the device.
 314          * handle_terminated_request allows to examine a cqr and prepare
 315          * it for retry.
 316          */
 317         struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
 318                                           struct dasd_block *,
 319                                           struct request *);
 320         int (*start_IO) (struct dasd_ccw_req *);
 321         int (*term_IO) (struct dasd_ccw_req *);
 322         void (*handle_terminated_request) (struct dasd_ccw_req *);
 323         struct dasd_ccw_req *(*format_device) (struct dasd_device *,
 324                                                struct format_data_t *);
 325         int (*free_cp) (struct dasd_ccw_req *, struct request *);
 326
 327         /*
 328          * Error recovery functions. examine_error() returns a value that
 329          * indicates what to do for an error condition. If examine_error()
 330          * returns 'dasd_era_recover' erp_action() is called to create a
 331          * special error recovery ccw. erp_postaction() is called after
 332          * an error recovery ccw has finished its execution. dump_sense
 333          * is called for every error condition to print the sense data
 334          * to the console.
 335          */
 336         dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
 337         dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
 338         void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
 339                             struct irb *);
 340         void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
 341         void (*check_for_device_change) (struct dasd_device *,
 342                                          struct dasd_ccw_req *,
 343                                          struct irb *);
 344
 345         /* i/o control functions. */
 346         int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
 347         int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
 348         int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
 349
 350         /* suspend/resume functions */
 351         int (*freeze) (struct dasd_device *);
 352         int (*restore) (struct dasd_device *);
 353
 354         /* reload device after state change */
 355         int (*reload) (struct dasd_device *);
 356
 357         int (*get_uid) (struct dasd_device *, struct dasd_uid *);
 358         void (*kick_validate) (struct dasd_device *);
 359 };
 360
 361 extern struct dasd_discipline *dasd_diag_discipline_pointer;
 362
 363 /*
 364  * Notification numbers for extended error reporting notifications:
 365  * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
 366  * eer pointer) is freed. The error reporting module needs to do all necessary
 367  * cleanup steps.
 368  * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
 369  */
 370 #define DASD_EER_DISABLE 0
 371 #define DASD_EER_TRIGGER 1
 372
 373 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
 374 #define DASD_EER_FATALERROR  1
 375 #define DASD_EER_NOPATH      2
 376 #define DASD_EER_STATECHANGE 3
 377 #define DASD_EER_PPRCSUSPEND 4
 378
 379 struct dasd_path {
 380         __u8 opm;
 381         __u8 tbvpm;
 382         __u8 ppm;
 383         __u8 npm;
 384 };
 385
 386 struct dasd_profile_info {
 387         /* legacy part of profile data, as in dasd_profile_info_t */
 388         unsigned int dasd_io_reqs;       /* number of requests processed */
 389         unsigned int dasd_io_sects;      /* number of sectors processed */
 390         unsigned int dasd_io_secs[32];   /* histogram of request's sizes */
 391         unsigned int dasd_io_times[32];  /* histogram of requests's times */
 392         unsigned int dasd_io_timps[32];  /* h. of requests's times per sector */
 393         unsigned int dasd_io_time1[32];  /* hist. of time from build to start */
 394         unsigned int dasd_io_time2[32];  /* hist. of time from start to irq */
 395         unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
 396         unsigned int dasd_io_time3[32];  /* hist. of time from irq to end */
 397         unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
 398
 399         /* new data */
 400         struct timespec starttod;          /* time of start or last reset */
 401         unsigned int dasd_io_alias;        /* requests using an alias */
 402         unsigned int dasd_io_tpm;          /* requests using transport mode */
 403         unsigned int dasd_read_reqs;       /* total number of read  requests */
 404         unsigned int dasd_read_sects;      /* total number read sectors */
 405         unsigned int dasd_read_alias;      /* read request using an alias */
 406         unsigned int dasd_read_tpm;        /* read requests in transport mode */
 407         unsigned int dasd_read_secs[32];   /* histogram of request's sizes */
 408         unsigned int dasd_read_times[32];  /* histogram of requests's times */
 409         unsigned int dasd_read_time1[32];  /* hist. time from build to start */
 410         unsigned int dasd_read_time2[32];  /* hist. of time from start to irq */
 411         unsigned int dasd_read_time3[32];  /* hist. of time from irq to end */
 412         unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
 413 };
 414
 415 struct dasd_profile {
 416         struct dentry *dentry;
 417         struct dasd_profile_info *data;
 418         spinlock_t lock;
 419 };
 420
 421 struct dasd_device {
 422         /* Block device stuff. */
 423         struct dasd_block *block;
 424
 425         unsigned int devindex;
 426         unsigned long flags;       /* per device flags */
 427         unsigned short features;   /* copy of devmap-features (read-only!) */
 428
 429         /* extended error reporting stuff (eer) */
 430         struct dasd_ccw_req *eer_cqr;
 431
 432         /* Device discipline stuff. */
 433         struct dasd_discipline *discipline;
 434         struct dasd_discipline *base_discipline;
 435         char *private;
 436         struct dasd_path path_data;
 437
 438         /* Device state and target state. */
 439         int state, target;
 440         struct mutex state_mutex;
 441         int stopped;            /* device (ccw_device_start) was stopped */
 442
 443         /* reference count. */
 444         atomic_t ref_count;
 445
 446         /* ccw queue and memory for static ccw/erp buffers. */
 447         struct list_head ccw_queue;
 448         spinlock_t mem_lock;
 449         void *ccw_mem;
 450         void *erp_mem;
 451         struct list_head ccw_chunks;
 452         struct list_head erp_chunks;
 453
 454         atomic_t tasklet_scheduled;
 455         struct tasklet_struct tasklet;
 456         struct work_struct kick_work;
 457         struct work_struct restore_device;
 458         struct work_struct reload_device;
 459         struct work_struct kick_validate;
 460         struct timer_list timer;
 461
 462         debug_info_t *debug_area;
 463
 464         struct ccw_device *cdev;
 465
 466         /* hook for alias management */
 467         struct list_head alias_list;
 468
 469         /* default expiration time in s */
 470         unsigned long default_expires;
 471
 472         struct dentry *debugfs_dentry;
 473         struct dasd_profile profile;
 474 };
 475
 476 struct dasd_block {
 477         /* Block device stuff. */
 478         struct gendisk *gdp;
 479         struct request_queue *request_queue;
 480         spinlock_t request_queue_lock;
 481         struct block_device *bdev;
 482         atomic_t open_count;
 483
 484         unsigned long long blocks; /* size of volume in blocks */
 485         unsigned int bp_block;     /* bytes per block */
 486         unsigned int s2b_shift;    /* log2 (bp_block/512) */
 487
 488         struct dasd_device *base;
 489         struct list_head ccw_queue;
 490         spinlock_t queue_lock;
 491
 492         atomic_t tasklet_scheduled;
 493         struct tasklet_struct tasklet;
 494         struct timer_list timer;
 495
 496         struct dentry *debugfs_dentry;
 497         struct dasd_profile profile;
 498 };
 499
 500
 501
 502 /* reasons why device (ccw_device_start) was stopped */
 503 #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
 504 #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
 505 #define DASD_STOPPED_PENDING 4         /* long busy */
 506 #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
 507 #define DASD_STOPPED_SU      16        /* summary unit check handling */
 508 #define DASD_STOPPED_PM      32        /* pm state transition */
 509 #define DASD_UNRESUMED_PM    64        /* pm resume failed state */
 510
 511 /* per device flags */
 512 #define DASD_FLAG_OFFLINE       3       /* device is in offline processing */
 513 #define DASD_FLAG_EER_SNSS      4       /* A SNSS is required */
 514 #define DASD_FLAG_EER_IN_USE    5       /* A SNSS request is running */
 515 #define DASD_FLAG_DEVICE_RO     6       /* The device itself is read-only. Don't
 516                                          * confuse this with the user specified
 517                                          * read-only feature.
 518                                          */
 519 #define DASD_FLAG_IS_RESERVED   7       /* The device is reserved */
 520 #define DASD_FLAG_LOCK_STOLEN   8       /* The device lock was stolen */
 521 #define DASD_FLAG_SUSPENDED     9       /* The device was suspended */
 522
 523
 524 void dasd_put_device_wake(struct dasd_device *);
 525
 526 /*
 527  * Reference count inliners
 528  */
 529 static inline void
 530 dasd_get_device(struct dasd_device *device)
 531 {
 532         atomic_inc(&device->ref_count);
 533 }
 534
 535 static inline void
 536 dasd_put_device(struct dasd_device *device)
 537 {
 538         if (atomic_dec_return(&device->ref_count) == 0)
 539                 dasd_put_device_wake(device);
 540 }
 541
 542 /*
 543  * The static memory in ccw_mem and erp_mem is managed by a sorted
 544  * list of free memory chunks.
 545  */
 546 struct dasd_mchunk
 547 {
 548         struct list_head list;
 549         unsigned long size;
 550 } __attribute__ ((aligned(8)));
 551
 552 static inline void
 553 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
 554                     unsigned long size)
 555 {
 556         struct dasd_mchunk *chunk;
 557
 558         INIT_LIST_HEAD(chunk_list);
 559         chunk = (struct dasd_mchunk *) mem;
 560         chunk->size = size - sizeof(struct dasd_mchunk);
 561         list_add(&chunk->list, chunk_list);
 562 }
 563
 564 static inline void *
 565 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
 566 {
 567         struct dasd_mchunk *chunk, *tmp;
 568
 569         size = (size + 7L) & -8L;
 570         list_for_each_entry(chunk, chunk_list, list) {
 571                 if (chunk->size < size)
 572                         continue;
 573                 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
 574                         char *endaddr = (char *) (chunk + 1) + chunk->size;
 575                         tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
 576                         tmp->size = size;
 577                         chunk->size -= size + sizeof(struct dasd_mchunk);
 578                         chunk = tmp;
 579                 } else
 580                         list_del(&chunk->list);
 581                 return (void *) (chunk + 1);
 582         }
 583         return NULL;
 584 }
 585
 586 static inline void
 587 dasd_free_chunk(struct list_head *chunk_list, void *mem)
 588 {
 589         struct dasd_mchunk *chunk, *tmp;
 590         struct list_head *p, *left;
 591
 592         chunk = (struct dasd_mchunk *)
 593                 ((char *) mem - sizeof(struct dasd_mchunk));
 594         /* Find out the left neighbour in chunk_list. */
 595         left = chunk_list;
 596         list_for_each(p, chunk_list) {
 597                 if (list_entry(p, struct dasd_mchunk, list) > chunk)
 598                         break;
 599                 left = p;
 600         }
 601         /* Try to merge with right neighbour = next element from left. */
 602         if (left->next != chunk_list) {
 603                 tmp = list_entry(left->next, struct dasd_mchunk, list);
 604                 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
 605                         list_del(&tmp->list);
 606                         chunk->size += tmp->size + sizeof(struct dasd_mchunk);
 607                 }
 608         }
 609         /* Try to merge with left neighbour. */
 610         if (left != chunk_list) {
 611                 tmp = list_entry(left, struct dasd_mchunk, list);
 612                 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
 613                         tmp->size += chunk->size + sizeof(struct dasd_mchunk);
 614                         return;
 615                 }
 616         }
 617         __list_add(&chunk->list, left, left->next);
 618 }
 619
 620 /*
 621  * Check if bsize is in { 512, 1024, 2048, 4096 }
 622  */
 623 static inline int
 624 dasd_check_blocksize(int bsize)
 625 {
 626         if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
 627                 return -EMEDIUMTYPE;
 628         return 0;
 629 }
 630
 631 /* externals in dasd.c */
 632 #define DASD_PROFILE_OFF         0
 633 #define DASD_PROFILE_ON          1
 634 #define DASD_PROFILE_GLOBAL_ONLY 2
 635
 636 extern debug_info_t *dasd_debug_area;
 637 extern struct dasd_profile_info dasd_global_profile_data;
 638 extern unsigned int dasd_global_profile_level;
 639 extern const struct block_device_operations dasd_device_operations;
 640
 641 extern struct kmem_cache *dasd_page_cache;
 642
 643 struct dasd_ccw_req *
 644 dasd_kmalloc_request(int , int, int, struct dasd_device *);
 645 struct dasd_ccw_req *
 646 dasd_smalloc_request(int , int, int, struct dasd_device *);
 647 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
 648 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 649 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
 650
 651 static inline int
 652 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
 653 {
 654         return set_normalized_cda(ccw, cda);
 655 }
 656
 657 struct dasd_device *dasd_alloc_device(void);
 658 void dasd_free_device(struct dasd_device *);
 659
 660 struct dasd_block *dasd_alloc_block(void);
 661 void dasd_free_block(struct dasd_block *);
 662
 663 void dasd_enable_device(struct dasd_device *);
 664 void dasd_set_target_state(struct dasd_device *, int);
 665 void dasd_kick_device(struct dasd_device *);
 666 void dasd_restore_device(struct dasd_device *);
 667 void dasd_reload_device(struct dasd_device *);
 668
 669 void dasd_add_request_head(struct dasd_ccw_req *);
 670 void dasd_add_request_tail(struct dasd_ccw_req *);
 671 int  dasd_start_IO(struct dasd_ccw_req *);
 672 int  dasd_term_IO(struct dasd_ccw_req *);
 673 void dasd_schedule_device_bh(struct dasd_device *);
 674 void dasd_schedule_block_bh(struct dasd_block *);
 675 int  dasd_sleep_on(struct dasd_ccw_req *);
 676 int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
 677 int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
 678 void dasd_device_set_timer(struct dasd_device *, int);
 679 void dasd_device_clear_timer(struct dasd_device *);
 680 void dasd_block_set_timer(struct dasd_block *, int);
 681 void dasd_block_clear_timer(struct dasd_block *);
 682 int  dasd_cancel_req(struct dasd_ccw_req *);
 683 int dasd_flush_device_queue(struct dasd_device *);
 684 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
 685 void dasd_generic_remove (struct ccw_device *cdev);
 686 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
 687 int dasd_generic_set_offline (struct ccw_device *cdev);
 688 int dasd_generic_notify(struct ccw_device *, int);
 689 int dasd_generic_last_path_gone(struct dasd_device *);
 690 int dasd_generic_path_operational(struct dasd_device *);
 691
 692 void dasd_generic_handle_state_change(struct dasd_device *);
 693 int dasd_generic_pm_freeze(struct ccw_device *);
 694 int dasd_generic_restore_device(struct ccw_device *);
 695 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
 696 void dasd_generic_path_event(struct ccw_device *, int *);
 697 int dasd_generic_verify_path(struct dasd_device *, __u8);
 698
 699 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
 700 char *dasd_get_sense(struct irb *);
 701
 702 void dasd_device_set_stop_bits(struct dasd_device *, int);
 703 void dasd_device_remove_stop_bits(struct dasd_device *, int);
 704
 705 int dasd_device_is_ro(struct dasd_device *);
 706
 707 void dasd_profile_reset(struct dasd_profile *);
 708 int dasd_profile_on(struct dasd_profile *);
 709 void dasd_profile_off(struct dasd_profile *);
 710 void dasd_global_profile_reset(void);
 711 char *dasd_get_user_string(const char __user *, size_t);
 712
 713 /* externals in dasd_devmap.c */
 714 extern int dasd_max_devindex;
 715 extern int dasd_probeonly;
 716 extern int dasd_autodetect;
 717 extern int dasd_nopav;
 718 extern int dasd_nofcx;
 719
 720 int dasd_devmap_init(void);
 721 void dasd_devmap_exit(void);
 722
 723 struct dasd_device *dasd_create_device(struct ccw_device *);
 724 void dasd_delete_device(struct dasd_device *);
 725
 726 int dasd_get_feature(struct ccw_device *, int);
 727 int dasd_set_feature(struct ccw_device *, int, int);
 728
 729 int dasd_add_sysfs_files(struct ccw_device *);
 730 void dasd_remove_sysfs_files(struct ccw_device *);
 731
 732 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 733 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
 734 struct dasd_device *dasd_device_from_devindex(int);
 735
 736 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
 737 struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
 738
 739 int dasd_parse(void);
 740 int dasd_busid_known(const char *);
 741
 742 /* externals in dasd_gendisk.c */
 743 int  dasd_gendisk_init(void);
 744 void dasd_gendisk_exit(void);
 745 int dasd_gendisk_alloc(struct dasd_block *);
 746 void dasd_gendisk_free(struct dasd_block *);
 747 int dasd_scan_partitions(struct dasd_block *);
 748 void dasd_destroy_partitions(struct dasd_block *);
 749
 750 /* externals in dasd_ioctl.c */
 751 int  dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
 752
 753 /* externals in dasd_proc.c */
 754 int dasd_proc_init(void);
 755 void dasd_proc_exit(void);
 756
 757 /* externals in dasd_erp.c */
 758 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 759 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
 760 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
 761                                             struct dasd_device *);
 762 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 763 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
 764 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
 765
 766 /* externals in dasd_3990_erp.c */
 767 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
 768 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
 769
 770 /* externals in dasd_eer.c */
 771 #ifdef CONFIG_DASD_EER
 772 int dasd_eer_init(void);
 773 void dasd_eer_exit(void);
 774 int dasd_eer_enable(struct dasd_device *);
 775 void dasd_eer_disable(struct dasd_device *);
 776 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
 777                     unsigned int id);
 778 void dasd_eer_snss(struct dasd_device *);
 779
 780 static inline int dasd_eer_enabled(struct dasd_device *device)
 781 {
 782         return device->eer_cqr != NULL;
 783 }
 784 #else
 785 #define dasd_eer_init()         (0)
 786 #define dasd_eer_exit()         do { } while (0)
 787 #define dasd_eer_enable(d)      (0)
 788 #define dasd_eer_disable(d)     do { } while (0)
 789 #define dasd_eer_write(d,c,i)   do { } while (0)
 790 #define dasd_eer_snss(d)        do { } while (0)
 791 #define dasd_eer_enabled(d)     (0)
 792 #endif  /* CONFIG_DASD_ERR */
 793
 794 #endif                          /* __KERNEL__ */
 795
 796 #endif                          /* DASD_H */