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         struct dasd_device *basedev;    /* base device if no block->base */
 179         void *cpaddr;                   /* address of ccw or tcw */
 180         unsigned char cpmode;           /* 0 = cmd mode, 1 = itcw */
 181         char status;                    /* status of this request */
 182         short retries;                  /* A retry counter */
 183         unsigned long flags;            /* flags of this request */
 184
 185         /* ... and how */
 186         unsigned long starttime;        /* jiffies time of request start */
 187         unsigned long expires;          /* expiration period in jiffies */
 188         char lpm;                       /* logical path mask */
 189         void *data;                     /* pointer to data area */
 190
 191         /* these are important for recovering erroneous requests          */
 192         int intrc;                      /* internal error, e.g. from start_IO */
 193         struct irb irb;                 /* device status in case of an error */
 194         struct dasd_ccw_req *refers;    /* ERP-chain queueing. */
 195         void *function;                 /* originating ERP action */
 196
 197         /* these are for statistics only */
 198         unsigned long long buildclk;    /* TOD-clock of request generation */
 199         unsigned long long startclk;    /* TOD-clock of request start */
 200         unsigned long long stopclk;     /* TOD-clock of request interrupt */
 201         unsigned long long endclk;      /* TOD-clock of request termination */
 202
 203         /* Callback that is called after reaching final status. */
 204         void (*callback)(struct dasd_ccw_req *, void *data);
 205         void *callback_data;
 206 };
 207
 208 /*
 209  * dasd_ccw_req -> status can be:
 210  */
 211 #define DASD_CQR_FILLED         0x00    /* request is ready to be processed */
 212 #define DASD_CQR_DONE           0x01    /* request is completed successfully */
 213 #define DASD_CQR_NEED_ERP       0x02    /* request needs recovery action */
 214 #define DASD_CQR_IN_ERP         0x03    /* request is in recovery */
 215 #define DASD_CQR_FAILED         0x04    /* request is finally failed */
 216 #define DASD_CQR_TERMINATED     0x05    /* request was stopped by driver */
 217
 218 #define DASD_CQR_QUEUED         0x80    /* request is queued to be processed */
 219 #define DASD_CQR_IN_IO          0x81    /* request is currently in IO */
 220 #define DASD_CQR_ERROR          0x82    /* request is completed with error */
 221 #define DASD_CQR_CLEAR_PENDING  0x83    /* request is clear pending */
 222 #define DASD_CQR_CLEARED        0x84    /* request was cleared */
 223 #define DASD_CQR_SUCCESS        0x85    /* request was successful */
 224
 225 /* default expiration time*/
 226 #define DASD_EXPIRES      300
 227 #define DASD_EXPIRES_MAX  40000000
 228 #define DASD_RETRIES      256
 229 #define DASD_RETRIES_MAX  32768
 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  * A single CQR can only contain a maximum of 255 CCWs. It is limited by
 245  * the locate record and locate record extended count value which can only hold
 246  * 1 Byte max.
 247  */
 248 #define DASD_CQR_MAX_CCW 255
 249
 250 /*
 251  * Unique identifier for dasd device.
 252  */
 253 #define UA_NOT_CONFIGURED  0x00
 254 #define UA_BASE_DEVICE     0x01
 255 #define UA_BASE_PAV_ALIAS  0x02
 256 #define UA_HYPER_PAV_ALIAS 0x03
 257
 258 struct dasd_uid {
 259         __u8 type;
 260         char vendor[4];
 261         char serial[15];
 262         __u16 ssid;
 263         __u8 real_unit_addr;
 264         __u8 base_unit_addr;
 265         char vduit[33];
 266 };
 267
 268 /*
 269  * the struct dasd_discipline is
 270  * sth like a table of virtual functions, if you think of dasd_eckd
 271  * inheriting dasd...
 272  * no, currently we are not planning to reimplement the driver in C++
 273  */
 274 struct dasd_discipline {
 275         struct module *owner;
 276         char ebcname[8];        /* a name used for tagging and printks */
 277         char name[8];           /* a name used for tagging and printks */
 278         int max_blocks;         /* maximum number of blocks to be chained */
 279
 280         struct list_head list;  /* used for list of disciplines */
 281
 282         /*
 283          * Device recognition functions. check_device is used to verify
 284          * the sense data and the information returned by read device
 285          * characteristics. It returns 0 if the discipline can be used
 286          * for the device in question. uncheck_device is called during
 287          * device shutdown to deregister a device from its discipline.
 288          */
 289         int (*check_device) (struct dasd_device *);
 290         void (*uncheck_device) (struct dasd_device *);
 291
 292         /*
 293          * do_analysis is used in the step from device state "basic" to
 294          * state "accept". It returns 0 if the device can be made ready,
 295          * it returns -EMEDIUMTYPE if the device can't be made ready or
 296          * -EAGAIN if do_analysis started a ccw that needs to complete
 297          * before the analysis may be repeated.
 298          */
 299         int (*do_analysis) (struct dasd_block *);
 300
 301         /*
 302          * This function is called, when new paths become available.
 303          * Disciplins may use this callback to do necessary setup work,
 304          * e.g. verify that new path is compatible with the current
 305          * configuration.
 306          */
 307         int (*verify_path)(struct dasd_device *, __u8);
 308
 309         /*
 310          * Last things to do when a device is set online, and first things
 311          * when it is set offline.
 312          */
 313         int (*basic_to_ready) (struct dasd_device *);
 314         int (*online_to_ready) (struct dasd_device *);
 315         int (*basic_to_known)(struct dasd_device *);
 316
 317         /* (struct dasd_device *);
 318          * Device operation functions. build_cp creates a ccw chain for
 319          * a block device request, start_io starts the request and
 320          * term_IO cancels it (e.g. in case of a timeout). format_device
 321          * returns a ccw chain to be used to format the device.
 322          * handle_terminated_request allows to examine a cqr and prepare
 323          * it for retry.
 324          */
 325         struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
 326                                           struct dasd_block *,
 327                                           struct request *);
 328         int (*start_IO) (struct dasd_ccw_req *);
 329         int (*term_IO) (struct dasd_ccw_req *);
 330         void (*handle_terminated_request) (struct dasd_ccw_req *);
 331         int (*format_device) (struct dasd_device *,
 332                               struct format_data_t *, int enable_pav);
 333         int (*free_cp) (struct dasd_ccw_req *, struct request *);
 334
 335         /*
 336          * Error recovery functions. examine_error() returns a value that
 337          * indicates what to do for an error condition. If examine_error()
 338          * returns 'dasd_era_recover' erp_action() is called to create a
 339          * special error recovery ccw. erp_postaction() is called after
 340          * an error recovery ccw has finished its execution. dump_sense
 341          * is called for every error condition to print the sense data
 342          * to the console.
 343          */
 344         dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
 345         dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
 346         void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
 347                             struct irb *);
 348         void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
 349         void (*check_for_device_change) (struct dasd_device *,
 350                                          struct dasd_ccw_req *,
 351                                          struct irb *);
 352
 353         /* i/o control functions. */
 354         int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
 355         int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
 356         int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
 357
 358         /* suspend/resume functions */
 359         int (*freeze) (struct dasd_device *);
 360         int (*restore) (struct dasd_device *);
 361
 362         /* reload device after state change */
 363         int (*reload) (struct dasd_device *);
 364
 365         int (*get_uid) (struct dasd_device *, struct dasd_uid *);
 366         void (*kick_validate) (struct dasd_device *);
 367         int (*check_attention)(struct dasd_device *, __u8);
 368 };
 369
 370 extern struct dasd_discipline *dasd_diag_discipline_pointer;
 371
 372 /*
 373  * Notification numbers for extended error reporting notifications:
 374  * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
 375  * eer pointer) is freed. The error reporting module needs to do all necessary
 376  * cleanup steps.
 377  * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
 378  */
 379 #define DASD_EER_DISABLE 0
 380 #define DASD_EER_TRIGGER 1
 381
 382 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
 383 #define DASD_EER_FATALERROR  1
 384 #define DASD_EER_NOPATH      2
 385 #define DASD_EER_STATECHANGE 3
 386 #define DASD_EER_PPRCSUSPEND 4
 387
 388 struct dasd_path {
 389         __u8 opm;
 390         __u8 tbvpm;
 391         __u8 ppm;
 392         __u8 npm;
 393         /* paths that are not used because of a special condition */
 394         __u8 cablepm; /* miss-cabled */
 395         __u8 hpfpm;   /* the HPF requirements of the other paths are not met */
 396         __u8 cuirpm;  /* CUIR varied offline */
 397 };
 398
 399 struct dasd_profile_info {
 400         /* legacy part of profile data, as in dasd_profile_info_t */
 401         unsigned int dasd_io_reqs;       /* number of requests processed */
 402         unsigned int dasd_io_sects;      /* number of sectors processed */
 403         unsigned int dasd_io_secs[32];   /* histogram of request's sizes */
 404         unsigned int dasd_io_times[32];  /* histogram of requests's times */
 405         unsigned int dasd_io_timps[32];  /* h. of requests's times per sector */
 406         unsigned int dasd_io_time1[32];  /* hist. of time from build to start */
 407         unsigned int dasd_io_time2[32];  /* hist. of time from start to irq */
 408         unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
 409         unsigned int dasd_io_time3[32];  /* hist. of time from irq to end */
 410         unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
 411
 412         /* new data */
 413         struct timespec starttod;          /* time of start or last reset */
 414         unsigned int dasd_io_alias;        /* requests using an alias */
 415         unsigned int dasd_io_tpm;          /* requests using transport mode */
 416         unsigned int dasd_read_reqs;       /* total number of read  requests */
 417         unsigned int dasd_read_sects;      /* total number read sectors */
 418         unsigned int dasd_read_alias;      /* read request using an alias */
 419         unsigned int dasd_read_tpm;        /* read requests in transport mode */
 420         unsigned int dasd_read_secs[32];   /* histogram of request's sizes */
 421         unsigned int dasd_read_times[32];  /* histogram of requests's times */
 422         unsigned int dasd_read_time1[32];  /* hist. time from build to start */
 423         unsigned int dasd_read_time2[32];  /* hist. of time from start to irq */
 424         unsigned int dasd_read_time3[32];  /* hist. of time from irq to end */
 425         unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
 426 };
 427
 428 struct dasd_profile {
 429         struct dentry *dentry;
 430         struct dasd_profile_info *data;
 431         spinlock_t lock;
 432 };
 433
 434 struct dasd_device {
 435         /* Block device stuff. */
 436         struct dasd_block *block;
 437
 438         unsigned int devindex;
 439         unsigned long flags;       /* per device flags */
 440         unsigned short features;   /* copy of devmap-features (read-only!) */
 441
 442         /* extended error reporting stuff (eer) */
 443         struct dasd_ccw_req *eer_cqr;
 444
 445         /* Device discipline stuff. */
 446         struct dasd_discipline *discipline;
 447         struct dasd_discipline *base_discipline;
 448         void *private;
 449         struct dasd_path path_data;
 450
 451         /* Device state and target state. */
 452         int state, target;
 453         struct mutex state_mutex;
 454         int stopped;            /* device (ccw_device_start) was stopped */
 455
 456         /* reference count. */
 457         atomic_t ref_count;
 458
 459         /* ccw queue and memory for static ccw/erp buffers. */
 460         struct list_head ccw_queue;
 461         spinlock_t mem_lock;
 462         void *ccw_mem;
 463         void *erp_mem;
 464         struct list_head ccw_chunks;
 465         struct list_head erp_chunks;
 466
 467         atomic_t tasklet_scheduled;
 468         struct tasklet_struct tasklet;
 469         struct work_struct kick_work;
 470         struct work_struct restore_device;
 471         struct work_struct reload_device;
 472         struct work_struct kick_validate;
 473         struct work_struct suc_work;
 474         struct timer_list timer;
 475
 476         debug_info_t *debug_area;
 477
 478         struct ccw_device *cdev;
 479
 480         /* hook for alias management */
 481         struct list_head alias_list;
 482
 483         /* default expiration time in s */
 484         unsigned long default_expires;
 485         unsigned long default_retries;
 486
 487         unsigned long blk_timeout;
 488
 489         struct dentry *debugfs_dentry;
 490         struct dasd_profile profile;
 491 };
 492
 493 struct dasd_block {
 494         /* Block device stuff. */
 495         struct gendisk *gdp;
 496         struct request_queue *request_queue;
 497         spinlock_t request_queue_lock;
 498         struct block_device *bdev;
 499         atomic_t open_count;
 500
 501         unsigned long long blocks; /* size of volume in blocks */
 502         unsigned int bp_block;     /* bytes per block */
 503         unsigned int s2b_shift;    /* log2 (bp_block/512) */
 504
 505         struct dasd_device *base;
 506         struct list_head ccw_queue;
 507         spinlock_t queue_lock;
 508
 509         atomic_t tasklet_scheduled;
 510         struct tasklet_struct tasklet;
 511         struct timer_list timer;
 512
 513         struct dentry *debugfs_dentry;
 514         struct dasd_profile profile;
 515 };
 516
 517 struct dasd_attention_data {
 518         struct dasd_device *device;
 519         __u8 lpum;
 520 };
 521
 522 /* reasons why device (ccw_device_start) was stopped */
 523 #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
 524 #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
 525 #define DASD_STOPPED_PENDING 4         /* long busy */
 526 #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
 527 #define DASD_STOPPED_SU      16        /* summary unit check handling */
 528 #define DASD_STOPPED_PM      32        /* pm state transition */
 529 #define DASD_UNRESUMED_PM    64        /* pm resume failed state */
 530
 531 /* per device flags */
 532 #define DASD_FLAG_OFFLINE       3       /* device is in offline processing */
 533 #define DASD_FLAG_EER_SNSS      4       /* A SNSS is required */
 534 #define DASD_FLAG_EER_IN_USE    5       /* A SNSS request is running */
 535 #define DASD_FLAG_DEVICE_RO     6       /* The device itself is read-only. Don't
 536                                          * confuse this with the user specified
 537                                          * read-only feature.
 538                                          */
 539 #define DASD_FLAG_IS_RESERVED   7       /* The device is reserved */
 540 #define DASD_FLAG_LOCK_STOLEN   8       /* The device lock was stolen */
 541 #define DASD_FLAG_SUSPENDED     9       /* The device was suspended */
 542 #define DASD_FLAG_SAFE_OFFLINE  10      /* safe offline processing requested*/
 543 #define DASD_FLAG_SAFE_OFFLINE_RUNNING  11      /* safe offline running */
 544 #define DASD_FLAG_ABORTALL      12      /* Abort all noretry requests */
 545 #define DASD_FLAG_PATH_VERIFY   13      /* Path verification worker running */
 546 #define DASD_FLAG_SUC           14      /* unhandled summary unit check */
 547
 548 #define DASD_SLEEPON_START_TAG  ((void *) 1)
 549 #define DASD_SLEEPON_END_TAG    ((void *) 2)
 550
 551 void dasd_put_device_wake(struct dasd_device *);
 552
 553 /*
 554  * Reference count inliners
 555  */
 556 static inline void
 557 dasd_get_device(struct dasd_device *device)
 558 {
 559         atomic_inc(&device->ref_count);
 560 }
 561
 562 static inline void
 563 dasd_put_device(struct dasd_device *device)
 564 {
 565         if (atomic_dec_return(&device->ref_count) == 0)
 566                 dasd_put_device_wake(device);
 567 }
 568
 569 /*
 570  * The static memory in ccw_mem and erp_mem is managed by a sorted
 571  * list of free memory chunks.
 572  */
 573 struct dasd_mchunk
 574 {
 575         struct list_head list;
 576         unsigned long size;
 577 } __attribute__ ((aligned(8)));
 578
 579 static inline void
 580 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
 581                     unsigned long size)
 582 {
 583         struct dasd_mchunk *chunk;
 584
 585         INIT_LIST_HEAD(chunk_list);
 586         chunk = (struct dasd_mchunk *) mem;
 587         chunk->size = size - sizeof(struct dasd_mchunk);
 588         list_add(&chunk->list, chunk_list);
 589 }
 590
 591 static inline void *
 592 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
 593 {
 594         struct dasd_mchunk *chunk, *tmp;
 595
 596         size = (size + 7L) & -8L;
 597         list_for_each_entry(chunk, chunk_list, list) {
 598                 if (chunk->size < size)
 599                         continue;
 600                 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
 601                         char *endaddr = (char *) (chunk + 1) + chunk->size;
 602                         tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
 603                         tmp->size = size;
 604                         chunk->size -= size + sizeof(struct dasd_mchunk);
 605                         chunk = tmp;
 606                 } else
 607                         list_del(&chunk->list);
 608                 return (void *) (chunk + 1);
 609         }
 610         return NULL;
 611 }
 612
 613 static inline void
 614 dasd_free_chunk(struct list_head *chunk_list, void *mem)
 615 {
 616         struct dasd_mchunk *chunk, *tmp;
 617         struct list_head *p, *left;
 618
 619         chunk = (struct dasd_mchunk *)
 620                 ((char *) mem - sizeof(struct dasd_mchunk));
 621         /* Find out the left neighbour in chunk_list. */
 622         left = chunk_list;
 623         list_for_each(p, chunk_list) {
 624                 if (list_entry(p, struct dasd_mchunk, list) > chunk)
 625                         break;
 626                 left = p;
 627         }
 628         /* Try to merge with right neighbour = next element from left. */
 629         if (left->next != chunk_list) {
 630                 tmp = list_entry(left->next, struct dasd_mchunk, list);
 631                 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
 632                         list_del(&tmp->list);
 633                         chunk->size += tmp->size + sizeof(struct dasd_mchunk);
 634                 }
 635         }
 636         /* Try to merge with left neighbour. */
 637         if (left != chunk_list) {
 638                 tmp = list_entry(left, struct dasd_mchunk, list);
 639                 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
 640                         tmp->size += chunk->size + sizeof(struct dasd_mchunk);
 641                         return;
 642                 }
 643         }
 644         __list_add(&chunk->list, left, left->next);
 645 }
 646
 647 /*
 648  * Check if bsize is in { 512, 1024, 2048, 4096 }
 649  */
 650 static inline int
 651 dasd_check_blocksize(int bsize)
 652 {
 653         if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
 654                 return -EMEDIUMTYPE;
 655         return 0;
 656 }
 657
 658 /* externals in dasd.c */
 659 #define DASD_PROFILE_OFF         0
 660 #define DASD_PROFILE_ON          1
 661 #define DASD_PROFILE_GLOBAL_ONLY 2
 662
 663 extern debug_info_t *dasd_debug_area;
 664 extern struct dasd_profile dasd_global_profile;
 665 extern unsigned int dasd_global_profile_level;
 666 extern const struct block_device_operations dasd_device_operations;
 667
 668 extern struct kmem_cache *dasd_page_cache;
 669
 670 struct dasd_ccw_req *
 671 dasd_kmalloc_request(int , int, int, struct dasd_device *);
 672 struct dasd_ccw_req *
 673 dasd_smalloc_request(int , int, int, struct dasd_device *);
 674 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
 675 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 676 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
 677
 678 static inline int
 679 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
 680 {
 681         return set_normalized_cda(ccw, cda);
 682 }
 683
 684 struct dasd_device *dasd_alloc_device(void);
 685 void dasd_free_device(struct dasd_device *);
 686
 687 struct dasd_block *dasd_alloc_block(void);
 688 void dasd_free_block(struct dasd_block *);
 689
 690 enum blk_eh_timer_return dasd_times_out(struct request *req);
 691
 692 void dasd_enable_device(struct dasd_device *);
 693 void dasd_set_target_state(struct dasd_device *, int);
 694 void dasd_kick_device(struct dasd_device *);
 695 void dasd_restore_device(struct dasd_device *);
 696 void dasd_reload_device(struct dasd_device *);
 697
 698 void dasd_add_request_head(struct dasd_ccw_req *);
 699 void dasd_add_request_tail(struct dasd_ccw_req *);
 700 int  dasd_start_IO(struct dasd_ccw_req *);
 701 int  dasd_term_IO(struct dasd_ccw_req *);
 702 void dasd_schedule_device_bh(struct dasd_device *);
 703 void dasd_schedule_block_bh(struct dasd_block *);
 704 int  dasd_sleep_on(struct dasd_ccw_req *);
 705 int  dasd_sleep_on_queue(struct list_head *);
 706 int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
 707 int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
 708 void dasd_device_set_timer(struct dasd_device *, int);
 709 void dasd_device_clear_timer(struct dasd_device *);
 710 void dasd_block_set_timer(struct dasd_block *, int);
 711 void dasd_block_clear_timer(struct dasd_block *);
 712 int  dasd_cancel_req(struct dasd_ccw_req *);
 713 int dasd_flush_device_queue(struct dasd_device *);
 714 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
 715 void dasd_generic_remove (struct ccw_device *cdev);
 716 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
 717 int dasd_generic_set_offline (struct ccw_device *cdev);
 718 int dasd_generic_notify(struct ccw_device *, int);
 719 int dasd_generic_last_path_gone(struct dasd_device *);
 720 int dasd_generic_path_operational(struct dasd_device *);
 721 void dasd_generic_shutdown(struct ccw_device *);
 722
 723 void dasd_generic_handle_state_change(struct dasd_device *);
 724 int dasd_generic_pm_freeze(struct ccw_device *);
 725 int dasd_generic_restore_device(struct ccw_device *);
 726 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
 727 void dasd_generic_path_event(struct ccw_device *, int *);
 728 int dasd_generic_verify_path(struct dasd_device *, __u8);
 729
 730 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
 731 char *dasd_get_sense(struct irb *);
 732
 733 void dasd_device_set_stop_bits(struct dasd_device *, int);
 734 void dasd_device_remove_stop_bits(struct dasd_device *, int);
 735
 736 int dasd_device_is_ro(struct dasd_device *);
 737
 738 void dasd_profile_reset(struct dasd_profile *);
 739 int dasd_profile_on(struct dasd_profile *);
 740 void dasd_profile_off(struct dasd_profile *);
 741 char *dasd_get_user_string(const char __user *, size_t);
 742
 743 /* externals in dasd_devmap.c */
 744 extern int dasd_max_devindex;
 745 extern int dasd_probeonly;
 746 extern int dasd_autodetect;
 747 extern int dasd_nopav;
 748 extern int dasd_nofcx;
 749
 750 int dasd_devmap_init(void);
 751 void dasd_devmap_exit(void);
 752
 753 struct dasd_device *dasd_create_device(struct ccw_device *);
 754 void dasd_delete_device(struct dasd_device *);
 755
 756 int dasd_get_feature(struct ccw_device *, int);
 757 int dasd_set_feature(struct ccw_device *, int, int);
 758
 759 int dasd_add_sysfs_files(struct ccw_device *);
 760 void dasd_remove_sysfs_files(struct ccw_device *);
 761
 762 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 763 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
 764 struct dasd_device *dasd_device_from_devindex(int);
 765
 766 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
 767 struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
 768
 769 int dasd_parse(void);
 770 int dasd_busid_known(const char *);
 771
 772 /* externals in dasd_gendisk.c */
 773 int  dasd_gendisk_init(void);
 774 void dasd_gendisk_exit(void);
 775 int dasd_gendisk_alloc(struct dasd_block *);
 776 void dasd_gendisk_free(struct dasd_block *);
 777 int dasd_scan_partitions(struct dasd_block *);
 778 void dasd_destroy_partitions(struct dasd_block *);
 779
 780 /* externals in dasd_ioctl.c */
 781 int  dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
 782
 783 /* externals in dasd_proc.c */
 784 int dasd_proc_init(void);
 785 void dasd_proc_exit(void);
 786
 787 /* externals in dasd_erp.c */
 788 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 789 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
 790 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
 791                                             struct dasd_device *);
 792 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 793 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
 794 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
 795
 796 /* externals in dasd_3990_erp.c */
 797 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
 798 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
 799
 800 /* externals in dasd_eer.c */
 801 #ifdef CONFIG_DASD_EER
 802 int dasd_eer_init(void);
 803 void dasd_eer_exit(void);
 804 int dasd_eer_enable(struct dasd_device *);
 805 void dasd_eer_disable(struct dasd_device *);
 806 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
 807                     unsigned int id);
 808 void dasd_eer_snss(struct dasd_device *);
 809
 810 static inline int dasd_eer_enabled(struct dasd_device *device)
 811 {
 812         return device->eer_cqr != NULL;
 813 }
 814 #else
 815 #define dasd_eer_init()         (0)
 816 #define dasd_eer_exit()         do { } while (0)
 817 #define dasd_eer_enable(d)      (0)
 818 #define dasd_eer_disable(d)     do { } while (0)
 819 #define dasd_eer_write(d,c,i)   do { } while (0)
 820 #define dasd_eer_snss(d)        do { } while (0)
 821 #define dasd_eer_enabled(d)     (0)
 822 #endif  /* CONFIG_DASD_ERR */
 823
 824 #endif                          /* DASD_H */