drivers/s390/block/dasd_int.h

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   5  * Bugreports.to..: <Linux390@de.ibm.com>
   6  * Copyright IBM Corp. 1999, 2009
   7  */
   8
   9 #ifndef DASD_INT_H
  10 #define DASD_INT_H
  11
  12 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
  13 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
  14 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
  15
  16 /*
  17  * States a dasd device can have:
  18  *   new: the dasd_device structure is allocated.
  19  *   known: the discipline for the device is identified.
  20  *   basic: the device can do basic i/o.
  21  *   unfmt: the device could not be analyzed (format is unknown).
  22  *   ready: partition detection is done and the device is can do block io.
  23  *   online: the device accepts requests from the block device queue.
  24  *
  25  * Things to do for startup state transitions:
  26  *   new -> known: find discipline for the device and create devfs entries.
  27  *   known -> basic: request irq line for the device.
  28  *   basic -> ready: do the initial analysis, e.g. format detection,
  29  *                   do block device setup and detect partitions.
  30  *   ready -> online: schedule the device tasklet.
  31  * Things to do for shutdown state transitions:
  32  *   online -> ready: just set the new device state.
  33  *   ready -> basic: flush requests from the block device layer, clear
  34  *                   partition information and reset format information.
  35  *   basic -> known: terminate all requests and free irq.
  36  *   known -> new: remove devfs entries and forget discipline.
  37  */
  38
  39 #define DASD_STATE_NEW    0
  40 #define DASD_STATE_KNOWN  1
  41 #define DASD_STATE_BASIC  2
  42 #define DASD_STATE_UNFMT  3
  43 #define DASD_STATE_READY  4
  44 #define DASD_STATE_ONLINE 5
  45
  46 #include <linux/module.h>
  47 #include <linux/wait.h>
  48 #include <linux/blkdev.h>
  49 #include <linux/genhd.h>
  50 #include <linux/hdreg.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/log2.h>
  53 #include <asm/ccwdev.h>
  54 #include <linux/workqueue.h>
  55 #include <asm/debug.h>
  56 #include <asm/dasd.h>
  57 #include <asm/idals.h>
  58
  59 /* DASD discipline magic */
  60 #define DASD_ECKD_MAGIC 0xC5C3D2C4
  61 #define DASD_DIAG_MAGIC 0xC4C9C1C7
  62 #define DASD_FBA_MAGIC 0xC6C2C140
  63
  64 /*
  65  * SECTION: Type definitions
  66  */
  67 struct dasd_device;
  68 struct dasd_block;
  69
  70 /* BIT DEFINITIONS FOR SENSE DATA */
  71 #define DASD_SENSE_BIT_0 0x80
  72 #define DASD_SENSE_BIT_1 0x40
  73 #define DASD_SENSE_BIT_2 0x20
  74 #define DASD_SENSE_BIT_3 0x10
  75
  76 /* BIT DEFINITIONS FOR SIM SENSE */
  77 #define DASD_SIM_SENSE 0x0F
  78 #define DASD_SIM_MSG_TO_OP 0x03
  79 #define DASD_SIM_LOG 0x0C
  80
  81 /* lock class for nested cdev lock */
  82 #define CDEV_NESTED_FIRST 1
  83 #define CDEV_NESTED_SECOND 2
  84
  85 /*
  86  * SECTION: MACROs for klogd and s390 debug feature (dbf)
  87  */
  88 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
  89 do { \
  90         debug_sprintf_event(d_device->debug_area, \
  91                             d_level, \
  92                             d_str "\n", \
  93                             d_data); \
  94 } while(0)
  95
  96 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
  97 do { \
  98         debug_sprintf_exception(d_device->debug_area, \
  99                                 d_level, \
 100                                 d_str "\n", \
 101                                 d_data); \
 102 } while(0)
 103
 104 #define DBF_EVENT(d_level, d_str, d_data...)\
 105 do { \
 106         debug_sprintf_event(dasd_debug_area, \
 107                             d_level,\
 108                             d_str "\n", \
 109                             d_data); \
 110 } while(0)
 111
 112 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...)      \
 113 do { \
 114         struct ccw_dev_id __dev_id;                     \
 115         ccw_device_get_id(d_cdev, &__dev_id);           \
 116         debug_sprintf_event(dasd_debug_area,            \
 117                             d_level,                                    \
 118                             "0.%x.%04x " d_str "\n",                    \
 119                             __dev_id.ssid, __dev_id.devno, d_data);     \
 120 } while (0)
 121
 122 #define DBF_EXC(d_level, d_str, d_data...)\
 123 do { \
 124         debug_sprintf_exception(dasd_debug_area, \
 125                                 d_level,\
 126                                 d_str "\n", \
 127                                 d_data); \
 128 } while(0)
 129
 130 /* limit size for an errorstring */
 131 #define ERRORLENGTH 30
 132
 133 /* definition of dbf debug levels */
 134 #define DBF_EMERG       0       /* system is unusable                   */
 135 #define DBF_ALERT       1       /* action must be taken immediately     */
 136 #define DBF_CRIT        2       /* critical conditions                  */
 137 #define DBF_ERR         3       /* error conditions                     */
 138 #define DBF_WARNING     4       /* warning conditions                   */
 139 #define DBF_NOTICE      5       /* normal but significant condition     */
 140 #define DBF_INFO        6       /* informational                        */
 141 #define DBF_DEBUG       6       /* debug-level messages                 */
 142
 143 /* messages to be written via klogd and dbf */
 144 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
 145 do { \
 146         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 147                dev_name(&d_device->cdev->dev), d_args); \
 148         DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
 149 } while(0)
 150
 151 #define MESSAGE(d_loglevel,d_string,d_args...)\
 152 do { \
 153         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 154         DBF_EVENT(DBF_ALERT, d_string, d_args); \
 155 } while(0)
 156
 157 /* messages to be written via klogd only */
 158 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
 159 do { \
 160         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 161                dev_name(&d_device->cdev->dev), d_args); \
 162 } while(0)
 163
 164 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
 165 do { \
 166         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 167 } while(0)
 168
 169 struct dasd_ccw_req {
 170         unsigned int magic;             /* Eye catcher */
 171         struct list_head devlist;       /* for dasd_device request queue */
 172         struct list_head blocklist;     /* for dasd_block request queue */
 173
 174         /* Where to execute what... */
 175         struct dasd_block *block;       /* the originating block device */
 176         struct dasd_device *memdev;     /* the device used to allocate this */
 177         struct dasd_device *startdev;   /* device the request is started on */
 178         void *cpaddr;                   /* address of ccw or tcw */
 179         unsigned char cpmode;           /* 0 = cmd mode, 1 = itcw */
 180         char status;                    /* status of this request */
 181         short retries;                  /* A retry counter */
 182         unsigned long flags;            /* flags of this request */
 183
 184         /* ... and how */
 185         unsigned long starttime;        /* jiffies time of request start */
 186         unsigned long expires;          /* expiration period in jiffies */
 187         char lpm;                       /* logical path mask */
 188         void *data;                     /* pointer to data area */
 189
 190         /* these are important for recovering erroneous requests          */
 191         int intrc;                      /* internal error, e.g. from start_IO */
 192         struct irb irb;                 /* device status in case of an error */
 193         struct dasd_ccw_req *refers;    /* ERP-chain queueing. */
 194         void *function;                 /* originating ERP action */
 195
 196         /* these are for statistics only */
 197         unsigned long long buildclk;    /* TOD-clock of request generation */
 198         unsigned long long startclk;    /* TOD-clock of request start */
 199         unsigned long long stopclk;     /* TOD-clock of request interrupt */
 200         unsigned long long endclk;      /* TOD-clock of request termination */
 201
 202         /* Callback that is called after reaching final status. */
 203         void (*callback)(struct dasd_ccw_req *, void *data);
 204         void *callback_data;
 205 };
 206
 207 /*
 208  * dasd_ccw_req -> status can be:
 209  */
 210 #define DASD_CQR_FILLED         0x00    /* request is ready to be processed */
 211 #define DASD_CQR_DONE           0x01    /* request is completed successfully */
 212 #define DASD_CQR_NEED_ERP       0x02    /* request needs recovery action */
 213 #define DASD_CQR_IN_ERP         0x03    /* request is in recovery */
 214 #define DASD_CQR_FAILED         0x04    /* request is finally failed */
 215 #define DASD_CQR_TERMINATED     0x05    /* request was stopped by driver */
 216
 217 #define DASD_CQR_QUEUED         0x80    /* request is queued to be processed */
 218 #define DASD_CQR_IN_IO          0x81    /* request is currently in IO */
 219 #define DASD_CQR_ERROR          0x82    /* request is completed with error */
 220 #define DASD_CQR_CLEAR_PENDING  0x83    /* request is clear pending */
 221 #define DASD_CQR_CLEARED        0x84    /* request was cleared */
 222 #define DASD_CQR_SUCCESS        0x85    /* request was successful */
 223
 224 /* default expiration time*/
 225 #define DASD_EXPIRES      300
 226 #define DASD_EXPIRES_MAX  40000000
 227 #define DASD_RETRIES      256
 228 #define DASD_RETRIES_MAX  32768
 229
 230 /* per dasd_ccw_req flags */
 231 #define DASD_CQR_FLAGS_USE_ERP   0      /* use ERP for this request */
 232 #define DASD_CQR_FLAGS_FAILFAST  1      /* FAILFAST */
 233 #define DASD_CQR_VERIFY_PATH     2      /* path verification request */
 234 #define DASD_CQR_ALLOW_SLOCK     3      /* Try this request even when lock was
 235                                          * stolen. Should not be combined with
 236                                          * DASD_CQR_FLAGS_USE_ERP
 237                                          */
 238
 239 /* Signature for error recovery functions. */
 240 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
 241
 242 /*
 243  * Unique identifier for dasd device.
 244  */
 245 #define UA_NOT_CONFIGURED  0x00
 246 #define UA_BASE_DEVICE     0x01
 247 #define UA_BASE_PAV_ALIAS  0x02
 248 #define UA_HYPER_PAV_ALIAS 0x03
 249
 250 struct dasd_uid {
 251         __u8 type;
 252         char vendor[4];
 253         char serial[15];
 254         __u16 ssid;
 255         __u8 real_unit_addr;
 256         __u8 base_unit_addr;
 257         char vduit[33];
 258 };
 259
 260 /*
 261  * the struct dasd_discipline is
 262  * sth like a table of virtual functions, if you think of dasd_eckd
 263  * inheriting dasd...
 264  * no, currently we are not planning to reimplement the driver in C++
 265  */
 266 struct dasd_discipline {
 267         struct module *owner;
 268         char ebcname[8];        /* a name used for tagging and printks */
 269         char name[8];           /* a name used for tagging and printks */
 270         int max_blocks;         /* maximum number of blocks to be chained */
 271
 272         struct list_head list;  /* used for list of disciplines */
 273
 274         /*
 275          * Device recognition functions. check_device is used to verify
 276          * the sense data and the information returned by read device
 277          * characteristics. It returns 0 if the discipline can be used
 278          * for the device in question. uncheck_device is called during
 279          * device shutdown to deregister a device from its discipline.
 280          */
 281         int (*check_device) (struct dasd_device *);
 282         void (*uncheck_device) (struct dasd_device *);
 283
 284         /*
 285          * do_analysis is used in the step from device state "basic" to
 286          * state "accept". It returns 0 if the device can be made ready,
 287          * it returns -EMEDIUMTYPE if the device can't be made ready or
 288          * -EAGAIN if do_analysis started a ccw that needs to complete
 289          * before the analysis may be repeated.
 290          */
 291         int (*do_analysis) (struct dasd_block *);
 292
 293         /*
 294          * This function is called, when new paths become available.
 295          * Disciplins may use this callback to do necessary setup work,
 296          * e.g. verify that new path is compatible with the current
 297          * configuration.
 298          */
 299         int (*verify_path)(struct dasd_device *, __u8);
 300
 301         /*
 302          * Last things to do when a device is set online, and first things
 303          * when it is set offline.
 304          */
 305         int (*basic_to_ready) (struct dasd_device *);
 306         int (*online_to_ready) (struct dasd_device *);
 307         int (*ready_to_basic)  (struct dasd_device *);
 308
 309         /* (struct dasd_device *);
 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         int (*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         unsigned long default_retries;
 472
 473         unsigned long blk_timeout;
 474
 475         struct dentry *debugfs_dentry;
 476         struct dasd_profile profile;
 477 };
 478
 479 struct dasd_block {
 480         /* Block device stuff. */
 481         struct gendisk *gdp;
 482         struct request_queue *request_queue;
 483         spinlock_t request_queue_lock;
 484         struct block_device *bdev;
 485         atomic_t open_count;
 486
 487         unsigned long long blocks; /* size of volume in blocks */
 488         unsigned int bp_block;     /* bytes per block */
 489         unsigned int s2b_shift;    /* log2 (bp_block/512) */
 490
 491         struct dasd_device *base;
 492         struct list_head ccw_queue;
 493         spinlock_t queue_lock;
 494
 495         atomic_t tasklet_scheduled;
 496         struct tasklet_struct tasklet;
 497         struct timer_list timer;
 498
 499         struct dentry *debugfs_dentry;
 500         struct dasd_profile profile;
 501 };
 502
 503
 504
 505 /* reasons why device (ccw_device_start) was stopped */
 506 #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
 507 #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
 508 #define DASD_STOPPED_PENDING 4         /* long busy */
 509 #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
 510 #define DASD_STOPPED_SU      16        /* summary unit check handling */
 511 #define DASD_STOPPED_PM      32        /* pm state transition */
 512 #define DASD_UNRESUMED_PM    64        /* pm resume failed state */
 513
 514 /* per device flags */
 515 #define DASD_FLAG_OFFLINE       3       /* device is in offline processing */
 516 #define DASD_FLAG_EER_SNSS      4       /* A SNSS is required */
 517 #define DASD_FLAG_EER_IN_USE    5       /* A SNSS request is running */
 518 #define DASD_FLAG_DEVICE_RO     6       /* The device itself is read-only. Don't
 519                                          * confuse this with the user specified
 520                                          * read-only feature.
 521                                          */
 522 #define DASD_FLAG_IS_RESERVED   7       /* The device is reserved */
 523 #define DASD_FLAG_LOCK_STOLEN   8       /* The device lock was stolen */
 524 #define DASD_FLAG_SUSPENDED     9       /* The device was suspended */
 525 #define DASD_FLAG_SAFE_OFFLINE  10      /* safe offline processing requested*/
 526 #define DASD_FLAG_SAFE_OFFLINE_RUNNING  11      /* safe offline running */
 527 #define DASD_FLAG_ABORTALL      12      /* Abort all noretry requests */
 528
 529 #define DASD_SLEEPON_START_TAG  ((void *) 1)
 530 #define DASD_SLEEPON_END_TAG    ((void *) 2)
 531
 532 void dasd_put_device_wake(struct dasd_device *);
 533
 534 /*
 535  * Reference count inliners
 536  */
 537 static inline void
 538 dasd_get_device(struct dasd_device *device)
 539 {
 540         atomic_inc(&device->ref_count);
 541 }
 542
 543 static inline void
 544 dasd_put_device(struct dasd_device *device)
 545 {
 546         if (atomic_dec_return(&device->ref_count) == 0)
 547                 dasd_put_device_wake(device);
 548 }
 549
 550 /*
 551  * The static memory in ccw_mem and erp_mem is managed by a sorted
 552  * list of free memory chunks.
 553  */
 554 struct dasd_mchunk
 555 {
 556         struct list_head list;
 557         unsigned long size;
 558 } __attribute__ ((aligned(8)));
 559
 560 static inline void
 561 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
 562                     unsigned long size)
 563 {
 564         struct dasd_mchunk *chunk;
 565
 566         INIT_LIST_HEAD(chunk_list);
 567         chunk = (struct dasd_mchunk *) mem;
 568         chunk->size = size - sizeof(struct dasd_mchunk);
 569         list_add(&chunk->list, chunk_list);
 570 }
 571
 572 static inline void *
 573 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
 574 {
 575         struct dasd_mchunk *chunk, *tmp;
 576
 577         size = (size + 7L) & -8L;
 578         list_for_each_entry(chunk, chunk_list, list) {
 579                 if (chunk->size < size)
 580                         continue;
 581                 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
 582                         char *endaddr = (char *) (chunk + 1) + chunk->size;
 583                         tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
 584                         tmp->size = size;
 585                         chunk->size -= size + sizeof(struct dasd_mchunk);
 586                         chunk = tmp;
 587                 } else
 588                         list_del(&chunk->list);
 589                 return (void *) (chunk + 1);
 590         }
 591         return NULL;
 592 }
 593
 594 static inline void
 595 dasd_free_chunk(struct list_head *chunk_list, void *mem)
 596 {
 597         struct dasd_mchunk *chunk, *tmp;
 598         struct list_head *p, *left;
 599
 600         chunk = (struct dasd_mchunk *)
 601                 ((char *) mem - sizeof(struct dasd_mchunk));
 602         /* Find out the left neighbour in chunk_list. */
 603         left = chunk_list;
 604         list_for_each(p, chunk_list) {
 605                 if (list_entry(p, struct dasd_mchunk, list) > chunk)
 606                         break;
 607                 left = p;
 608         }
 609         /* Try to merge with right neighbour = next element from left. */
 610         if (left->next != chunk_list) {
 611                 tmp = list_entry(left->next, struct dasd_mchunk, list);
 612                 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
 613                         list_del(&tmp->list);
 614                         chunk->size += tmp->size + sizeof(struct dasd_mchunk);
 615                 }
 616         }
 617         /* Try to merge with left neighbour. */
 618         if (left != chunk_list) {
 619                 tmp = list_entry(left, struct dasd_mchunk, list);
 620                 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
 621                         tmp->size += chunk->size + sizeof(struct dasd_mchunk);
 622                         return;
 623                 }
 624         }
 625         __list_add(&chunk->list, left, left->next);
 626 }
 627
 628 /*
 629  * Check if bsize is in { 512, 1024, 2048, 4096 }
 630  */
 631 static inline int
 632 dasd_check_blocksize(int bsize)
 633 {
 634         if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
 635                 return -EMEDIUMTYPE;
 636         return 0;
 637 }
 638
 639 /* externals in dasd.c */
 640 #define DASD_PROFILE_OFF         0
 641 #define DASD_PROFILE_ON          1
 642 #define DASD_PROFILE_GLOBAL_ONLY 2
 643
 644 extern debug_info_t *dasd_debug_area;
 645 extern struct dasd_profile_info dasd_global_profile_data;
 646 extern unsigned int dasd_global_profile_level;
 647 extern const struct block_device_operations dasd_device_operations;
 648
 649 extern struct kmem_cache *dasd_page_cache;
 650
 651 struct dasd_ccw_req *
 652 dasd_kmalloc_request(int , int, int, struct dasd_device *);
 653 struct dasd_ccw_req *
 654 dasd_smalloc_request(int , int, int, struct dasd_device *);
 655 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
 656 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 657 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
 658
 659 static inline int
 660 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
 661 {
 662         return set_normalized_cda(ccw, cda);
 663 }
 664
 665 struct dasd_device *dasd_alloc_device(void);
 666 void dasd_free_device(struct dasd_device *);
 667
 668 struct dasd_block *dasd_alloc_block(void);
 669 void dasd_free_block(struct dasd_block *);
 670
 671 enum blk_eh_timer_return dasd_times_out(struct request *req);
 672
 673 void dasd_enable_device(struct dasd_device *);
 674 void dasd_set_target_state(struct dasd_device *, int);
 675 void dasd_kick_device(struct dasd_device *);
 676 void dasd_restore_device(struct dasd_device *);
 677 void dasd_reload_device(struct dasd_device *);
 678
 679 void dasd_add_request_head(struct dasd_ccw_req *);
 680 void dasd_add_request_tail(struct dasd_ccw_req *);
 681 int  dasd_start_IO(struct dasd_ccw_req *);
 682 int  dasd_term_IO(struct dasd_ccw_req *);
 683 void dasd_schedule_device_bh(struct dasd_device *);
 684 void dasd_schedule_block_bh(struct dasd_block *);
 685 int  dasd_sleep_on(struct dasd_ccw_req *);
 686 int  dasd_sleep_on_queue(struct list_head *);
 687 int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
 688 int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
 689 void dasd_device_set_timer(struct dasd_device *, int);
 690 void dasd_device_clear_timer(struct dasd_device *);
 691 void dasd_block_set_timer(struct dasd_block *, int);
 692 void dasd_block_clear_timer(struct dasd_block *);
 693 int  dasd_cancel_req(struct dasd_ccw_req *);
 694 int dasd_flush_device_queue(struct dasd_device *);
 695 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
 696 void dasd_generic_remove (struct ccw_device *cdev);
 697 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
 698 int dasd_generic_set_offline (struct ccw_device *cdev);
 699 int dasd_generic_notify(struct ccw_device *, int);
 700 int dasd_generic_last_path_gone(struct dasd_device *);
 701 int dasd_generic_path_operational(struct dasd_device *);
 702 void dasd_generic_shutdown(struct ccw_device *);
 703
 704 void dasd_generic_handle_state_change(struct dasd_device *);
 705 int dasd_generic_pm_freeze(struct ccw_device *);
 706 int dasd_generic_restore_device(struct ccw_device *);
 707 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
 708 void dasd_generic_path_event(struct ccw_device *, int *);
 709 int dasd_generic_verify_path(struct dasd_device *, __u8);
 710
 711 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
 712 char *dasd_get_sense(struct irb *);
 713
 714 void dasd_device_set_stop_bits(struct dasd_device *, int);
 715 void dasd_device_remove_stop_bits(struct dasd_device *, int);
 716
 717 int dasd_device_is_ro(struct dasd_device *);
 718
 719 void dasd_profile_reset(struct dasd_profile *);
 720 int dasd_profile_on(struct dasd_profile *);
 721 void dasd_profile_off(struct dasd_profile *);
 722 void dasd_global_profile_reset(void);
 723 char *dasd_get_user_string(const char __user *, size_t);
 724
 725 /* externals in dasd_devmap.c */
 726 extern int dasd_max_devindex;
 727 extern int dasd_probeonly;
 728 extern int dasd_autodetect;
 729 extern int dasd_nopav;
 730 extern int dasd_nofcx;
 731
 732 int dasd_devmap_init(void);
 733 void dasd_devmap_exit(void);
 734
 735 struct dasd_device *dasd_create_device(struct ccw_device *);
 736 void dasd_delete_device(struct dasd_device *);
 737
 738 int dasd_get_feature(struct ccw_device *, int);
 739 int dasd_set_feature(struct ccw_device *, int, int);
 740
 741 int dasd_add_sysfs_files(struct ccw_device *);
 742 void dasd_remove_sysfs_files(struct ccw_device *);
 743
 744 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 745 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
 746 struct dasd_device *dasd_device_from_devindex(int);
 747
 748 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
 749 struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
 750
 751 int dasd_parse(void);
 752 int dasd_busid_known(const char *);
 753
 754 /* externals in dasd_gendisk.c */
 755 int  dasd_gendisk_init(void);
 756 void dasd_gendisk_exit(void);
 757 int dasd_gendisk_alloc(struct dasd_block *);
 758 void dasd_gendisk_free(struct dasd_block *);
 759 int dasd_scan_partitions(struct dasd_block *);
 760 void dasd_destroy_partitions(struct dasd_block *);
 761
 762 /* externals in dasd_ioctl.c */
 763 int  dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
 764
 765 /* externals in dasd_proc.c */
 766 int dasd_proc_init(void);
 767 void dasd_proc_exit(void);
 768
 769 /* externals in dasd_erp.c */
 770 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 771 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
 772 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
 773                                             struct dasd_device *);
 774 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 775 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
 776 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
 777
 778 /* externals in dasd_3990_erp.c */
 779 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
 780 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
 781
 782 /* externals in dasd_eer.c */
 783 #ifdef CONFIG_DASD_EER
 784 int dasd_eer_init(void);
 785 void dasd_eer_exit(void);
 786 int dasd_eer_enable(struct dasd_device *);
 787 void dasd_eer_disable(struct dasd_device *);
 788 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
 789                     unsigned int id);
 790 void dasd_eer_snss(struct dasd_device *);
 791
 792 static inline int dasd_eer_enabled(struct dasd_device *device)
 793 {
 794         return device->eer_cqr != NULL;
 795 }
 796 #else
 797 #define dasd_eer_init()         (0)
 798 #define dasd_eer_exit()         do { } while (0)
 799 #define dasd_eer_enable(d)      (0)
 800 #define dasd_eer_disable(d)     do { } while (0)
 801 #define dasd_eer_write(d,c,i)   do { } while (0)
 802 #define dasd_eer_snss(d)        do { } while (0)
 803 #define dasd_eer_enabled(d)     (0)
 804 #endif  /* CONFIG_DASD_ERR */
 805
 806 #endif                          /* DASD_H */