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  * 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 (*basic_to_ready) (struct dasd_device *);
 307         int (*online_to_ready) (struct dasd_device *);
 308         int (*basic_to_known)(struct dasd_device *);
 309
 310         /* (struct dasd_device *);
 311          * Device operation functions. build_cp creates a ccw chain for
 312          * a block device request, start_io starts the request and
 313          * term_IO cancels it (e.g. in case of a timeout). format_device
 314          * returns a ccw chain to be used to format the device.
 315          * handle_terminated_request allows to examine a cqr and prepare
 316          * it for retry.
 317          */
 318         struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
 319                                           struct dasd_block *,
 320                                           struct request *);
 321         int (*start_IO) (struct dasd_ccw_req *);
 322         int (*term_IO) (struct dasd_ccw_req *);
 323         void (*handle_terminated_request) (struct dasd_ccw_req *);
 324         int (*format_device) (struct dasd_device *,
 325                               struct format_data_t *, int enable_pav);
 326         int (*free_cp) (struct dasd_ccw_req *, struct request *);
 327
 328         /*
 329          * Error recovery functions. examine_error() returns a value that
 330          * indicates what to do for an error condition. If examine_error()
 331          * returns 'dasd_era_recover' erp_action() is called to create a
 332          * special error recovery ccw. erp_postaction() is called after
 333          * an error recovery ccw has finished its execution. dump_sense
 334          * is called for every error condition to print the sense data
 335          * to the console.
 336          */
 337         dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
 338         dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
 339         void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
 340                             struct irb *);
 341         void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
 342         void (*check_for_device_change) (struct dasd_device *,
 343                                          struct dasd_ccw_req *,
 344                                          struct irb *);
 345
 346         /* i/o control functions. */
 347         int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
 348         int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
 349         int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
 350
 351         /* suspend/resume functions */
 352         int (*freeze) (struct dasd_device *);
 353         int (*restore) (struct dasd_device *);
 354
 355         /* reload device after state change */
 356         int (*reload) (struct dasd_device *);
 357
 358         int (*get_uid) (struct dasd_device *, struct dasd_uid *);
 359         void (*kick_validate) (struct dasd_device *);
 360         int (*check_attention)(struct dasd_device *, __u8);
 361 };
 362
 363 extern struct dasd_discipline *dasd_diag_discipline_pointer;
 364
 365 /*
 366  * Notification numbers for extended error reporting notifications:
 367  * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
 368  * eer pointer) is freed. The error reporting module needs to do all necessary
 369  * cleanup steps.
 370  * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
 371  */
 372 #define DASD_EER_DISABLE 0
 373 #define DASD_EER_TRIGGER 1
 374
 375 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
 376 #define DASD_EER_FATALERROR  1
 377 #define DASD_EER_NOPATH      2
 378 #define DASD_EER_STATECHANGE 3
 379 #define DASD_EER_PPRCSUSPEND 4
 380
 381 struct dasd_path {
 382         __u8 opm;
 383         __u8 tbvpm;
 384         __u8 ppm;
 385         __u8 npm;
 386         /* paths that are not used because of a special condition */
 387         __u8 cablepm; /* miss-cabled */
 388         __u8 hpfpm;   /* the HPF requirements of the other paths are not met */
 389         __u8 cuirpm;  /* CUIR varied offline */
 390 };
 391
 392 struct dasd_profile_info {
 393         /* legacy part of profile data, as in dasd_profile_info_t */
 394         unsigned int dasd_io_reqs;       /* number of requests processed */
 395         unsigned int dasd_io_sects;      /* number of sectors processed */
 396         unsigned int dasd_io_secs[32];   /* histogram of request's sizes */
 397         unsigned int dasd_io_times[32];  /* histogram of requests's times */
 398         unsigned int dasd_io_timps[32];  /* h. of requests's times per sector */
 399         unsigned int dasd_io_time1[32];  /* hist. of time from build to start */
 400         unsigned int dasd_io_time2[32];  /* hist. of time from start to irq */
 401         unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
 402         unsigned int dasd_io_time3[32];  /* hist. of time from irq to end */
 403         unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
 404
 405         /* new data */
 406         struct timespec starttod;          /* time of start or last reset */
 407         unsigned int dasd_io_alias;        /* requests using an alias */
 408         unsigned int dasd_io_tpm;          /* requests using transport mode */
 409         unsigned int dasd_read_reqs;       /* total number of read  requests */
 410         unsigned int dasd_read_sects;      /* total number read sectors */
 411         unsigned int dasd_read_alias;      /* read request using an alias */
 412         unsigned int dasd_read_tpm;        /* read requests in transport mode */
 413         unsigned int dasd_read_secs[32];   /* histogram of request's sizes */
 414         unsigned int dasd_read_times[32];  /* histogram of requests's times */
 415         unsigned int dasd_read_time1[32];  /* hist. time from build to start */
 416         unsigned int dasd_read_time2[32];  /* hist. of time from start to irq */
 417         unsigned int dasd_read_time3[32];  /* hist. of time from irq to end */
 418         unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
 419 };
 420
 421 struct dasd_profile {
 422         struct dentry *dentry;
 423         struct dasd_profile_info *data;
 424         spinlock_t lock;
 425 };
 426
 427 struct dasd_device {
 428         /* Block device stuff. */
 429         struct dasd_block *block;
 430
 431         unsigned int devindex;
 432         unsigned long flags;       /* per device flags */
 433         unsigned short features;   /* copy of devmap-features (read-only!) */
 434
 435         /* extended error reporting stuff (eer) */
 436         struct dasd_ccw_req *eer_cqr;
 437
 438         /* Device discipline stuff. */
 439         struct dasd_discipline *discipline;
 440         struct dasd_discipline *base_discipline;
 441         char *private;
 442         struct dasd_path path_data;
 443
 444         /* Device state and target state. */
 445         int state, target;
 446         struct mutex state_mutex;
 447         int stopped;            /* device (ccw_device_start) was stopped */
 448
 449         /* reference count. */
 450         atomic_t ref_count;
 451
 452         /* ccw queue and memory for static ccw/erp buffers. */
 453         struct list_head ccw_queue;
 454         spinlock_t mem_lock;
 455         void *ccw_mem;
 456         void *erp_mem;
 457         struct list_head ccw_chunks;
 458         struct list_head erp_chunks;
 459
 460         atomic_t tasklet_scheduled;
 461         struct tasklet_struct tasklet;
 462         struct work_struct kick_work;
 463         struct work_struct restore_device;
 464         struct work_struct reload_device;
 465         struct work_struct kick_validate;
 466         struct timer_list timer;
 467
 468         debug_info_t *debug_area;
 469
 470         struct ccw_device *cdev;
 471
 472         /* hook for alias management */
 473         struct list_head alias_list;
 474
 475         /* default expiration time in s */
 476         unsigned long default_expires;
 477         unsigned long default_retries;
 478
 479         unsigned long blk_timeout;
 480
 481         struct dentry *debugfs_dentry;
 482         struct dasd_profile profile;
 483 };
 484
 485 struct dasd_block {
 486         /* Block device stuff. */
 487         struct gendisk *gdp;
 488         struct request_queue *request_queue;
 489         spinlock_t request_queue_lock;
 490         struct block_device *bdev;
 491         atomic_t open_count;
 492
 493         unsigned long long blocks; /* size of volume in blocks */
 494         unsigned int bp_block;     /* bytes per block */
 495         unsigned int s2b_shift;    /* log2 (bp_block/512) */
 496
 497         struct dasd_device *base;
 498         struct list_head ccw_queue;
 499         spinlock_t queue_lock;
 500
 501         atomic_t tasklet_scheduled;
 502         struct tasklet_struct tasklet;
 503         struct timer_list timer;
 504
 505         struct dentry *debugfs_dentry;
 506         struct dasd_profile profile;
 507 };
 508
 509 struct dasd_attention_data {
 510         struct dasd_device *device;
 511         __u8 lpum;
 512 };
 513
 514 /* reasons why device (ccw_device_start) was stopped */
 515 #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
 516 #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
 517 #define DASD_STOPPED_PENDING 4         /* long busy */
 518 #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
 519 #define DASD_STOPPED_SU      16        /* summary unit check handling */
 520 #define DASD_STOPPED_PM      32        /* pm state transition */
 521 #define DASD_UNRESUMED_PM    64        /* pm resume failed state */
 522
 523 /* per device flags */
 524 #define DASD_FLAG_OFFLINE       3       /* device is in offline processing */
 525 #define DASD_FLAG_EER_SNSS      4       /* A SNSS is required */
 526 #define DASD_FLAG_EER_IN_USE    5       /* A SNSS request is running */
 527 #define DASD_FLAG_DEVICE_RO     6       /* The device itself is read-only. Don't
 528                                          * confuse this with the user specified
 529                                          * read-only feature.
 530                                          */
 531 #define DASD_FLAG_IS_RESERVED   7       /* The device is reserved */
 532 #define DASD_FLAG_LOCK_STOLEN   8       /* The device lock was stolen */
 533 #define DASD_FLAG_SUSPENDED     9       /* The device was suspended */
 534 #define DASD_FLAG_SAFE_OFFLINE  10      /* safe offline processing requested*/
 535 #define DASD_FLAG_SAFE_OFFLINE_RUNNING  11      /* safe offline running */
 536 #define DASD_FLAG_ABORTALL      12      /* Abort all noretry requests */
 537
 538 #define DASD_SLEEPON_START_TAG  ((void *) 1)
 539 #define DASD_SLEEPON_END_TAG    ((void *) 2)
 540
 541 void dasd_put_device_wake(struct dasd_device *);
 542
 543 /*
 544  * Reference count inliners
 545  */
 546 static inline void
 547 dasd_get_device(struct dasd_device *device)
 548 {
 549         atomic_inc(&device->ref_count);
 550 }
 551
 552 static inline void
 553 dasd_put_device(struct dasd_device *device)
 554 {
 555         if (atomic_dec_return(&device->ref_count) == 0)
 556                 dasd_put_device_wake(device);
 557 }
 558
 559 /*
 560  * The static memory in ccw_mem and erp_mem is managed by a sorted
 561  * list of free memory chunks.
 562  */
 563 struct dasd_mchunk
 564 {
 565         struct list_head list;
 566         unsigned long size;
 567 } __attribute__ ((aligned(8)));
 568
 569 static inline void
 570 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
 571                     unsigned long size)
 572 {
 573         struct dasd_mchunk *chunk;
 574
 575         INIT_LIST_HEAD(chunk_list);
 576         chunk = (struct dasd_mchunk *) mem;
 577         chunk->size = size - sizeof(struct dasd_mchunk);
 578         list_add(&chunk->list, chunk_list);
 579 }
 580
 581 static inline void *
 582 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
 583 {
 584         struct dasd_mchunk *chunk, *tmp;
 585
 586         size = (size + 7L) & -8L;
 587         list_for_each_entry(chunk, chunk_list, list) {
 588                 if (chunk->size < size)
 589                         continue;
 590                 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
 591                         char *endaddr = (char *) (chunk + 1) + chunk->size;
 592                         tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
 593                         tmp->size = size;
 594                         chunk->size -= size + sizeof(struct dasd_mchunk);
 595                         chunk = tmp;
 596                 } else
 597                         list_del(&chunk->list);
 598                 return (void *) (chunk + 1);
 599         }
 600         return NULL;
 601 }
 602
 603 static inline void
 604 dasd_free_chunk(struct list_head *chunk_list, void *mem)
 605 {
 606         struct dasd_mchunk *chunk, *tmp;
 607         struct list_head *p, *left;
 608
 609         chunk = (struct dasd_mchunk *)
 610                 ((char *) mem - sizeof(struct dasd_mchunk));
 611         /* Find out the left neighbour in chunk_list. */
 612         left = chunk_list;
 613         list_for_each(p, chunk_list) {
 614                 if (list_entry(p, struct dasd_mchunk, list) > chunk)
 615                         break;
 616                 left = p;
 617         }
 618         /* Try to merge with right neighbour = next element from left. */
 619         if (left->next != chunk_list) {
 620                 tmp = list_entry(left->next, struct dasd_mchunk, list);
 621                 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
 622                         list_del(&tmp->list);
 623                         chunk->size += tmp->size + sizeof(struct dasd_mchunk);
 624                 }
 625         }
 626         /* Try to merge with left neighbour. */
 627         if (left != chunk_list) {
 628                 tmp = list_entry(left, struct dasd_mchunk, list);
 629                 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
 630                         tmp->size += chunk->size + sizeof(struct dasd_mchunk);
 631                         return;
 632                 }
 633         }
 634         __list_add(&chunk->list, left, left->next);
 635 }
 636
 637 /*
 638  * Check if bsize is in { 512, 1024, 2048, 4096 }
 639  */
 640 static inline int
 641 dasd_check_blocksize(int bsize)
 642 {
 643         if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
 644                 return -EMEDIUMTYPE;
 645         return 0;
 646 }
 647
 648 /* externals in dasd.c */
 649 #define DASD_PROFILE_OFF         0
 650 #define DASD_PROFILE_ON          1
 651 #define DASD_PROFILE_GLOBAL_ONLY 2
 652
 653 extern debug_info_t *dasd_debug_area;
 654 extern struct dasd_profile_info dasd_global_profile_data;
 655 extern unsigned int dasd_global_profile_level;
 656 extern const struct block_device_operations dasd_device_operations;
 657
 658 extern struct kmem_cache *dasd_page_cache;
 659
 660 struct dasd_ccw_req *
 661 dasd_kmalloc_request(int , int, int, struct dasd_device *);
 662 struct dasd_ccw_req *
 663 dasd_smalloc_request(int , int, int, struct dasd_device *);
 664 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
 665 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 666 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
 667
 668 static inline int
 669 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
 670 {
 671         return set_normalized_cda(ccw, cda);
 672 }
 673
 674 struct dasd_device *dasd_alloc_device(void);
 675 void dasd_free_device(struct dasd_device *);
 676
 677 struct dasd_block *dasd_alloc_block(void);
 678 void dasd_free_block(struct dasd_block *);
 679
 680 enum blk_eh_timer_return dasd_times_out(struct request *req);
 681
 682 void dasd_enable_device(struct dasd_device *);
 683 void dasd_set_target_state(struct dasd_device *, int);
 684 void dasd_kick_device(struct dasd_device *);
 685 void dasd_restore_device(struct dasd_device *);
 686 void dasd_reload_device(struct dasd_device *);
 687
 688 void dasd_add_request_head(struct dasd_ccw_req *);
 689 void dasd_add_request_tail(struct dasd_ccw_req *);
 690 int  dasd_start_IO(struct dasd_ccw_req *);
 691 int  dasd_term_IO(struct dasd_ccw_req *);
 692 void dasd_schedule_device_bh(struct dasd_device *);
 693 void dasd_schedule_block_bh(struct dasd_block *);
 694 int  dasd_sleep_on(struct dasd_ccw_req *);
 695 int  dasd_sleep_on_queue(struct list_head *);
 696 int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
 697 int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
 698 void dasd_device_set_timer(struct dasd_device *, int);
 699 void dasd_device_clear_timer(struct dasd_device *);
 700 void dasd_block_set_timer(struct dasd_block *, int);
 701 void dasd_block_clear_timer(struct dasd_block *);
 702 int  dasd_cancel_req(struct dasd_ccw_req *);
 703 int dasd_flush_device_queue(struct dasd_device *);
 704 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
 705 void dasd_generic_remove (struct ccw_device *cdev);
 706 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
 707 int dasd_generic_set_offline (struct ccw_device *cdev);
 708 int dasd_generic_notify(struct ccw_device *, int);
 709 int dasd_generic_last_path_gone(struct dasd_device *);
 710 int dasd_generic_path_operational(struct dasd_device *);
 711 void dasd_generic_shutdown(struct ccw_device *);
 712
 713 void dasd_generic_handle_state_change(struct dasd_device *);
 714 int dasd_generic_pm_freeze(struct ccw_device *);
 715 int dasd_generic_restore_device(struct ccw_device *);
 716 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
 717 void dasd_generic_path_event(struct ccw_device *, int *);
 718 int dasd_generic_verify_path(struct dasd_device *, __u8);
 719
 720 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
 721 char *dasd_get_sense(struct irb *);
 722
 723 void dasd_device_set_stop_bits(struct dasd_device *, int);
 724 void dasd_device_remove_stop_bits(struct dasd_device *, int);
 725
 726 int dasd_device_is_ro(struct dasd_device *);
 727
 728 void dasd_profile_reset(struct dasd_profile *);
 729 int dasd_profile_on(struct dasd_profile *);
 730 void dasd_profile_off(struct dasd_profile *);
 731 void dasd_global_profile_reset(void);
 732 char *dasd_get_user_string(const char __user *, size_t);
 733
 734 /* externals in dasd_devmap.c */
 735 extern int dasd_max_devindex;
 736 extern int dasd_probeonly;
 737 extern int dasd_autodetect;
 738 extern int dasd_nopav;
 739 extern int dasd_nofcx;
 740
 741 int dasd_devmap_init(void);
 742 void dasd_devmap_exit(void);
 743
 744 struct dasd_device *dasd_create_device(struct ccw_device *);
 745 void dasd_delete_device(struct dasd_device *);
 746
 747 int dasd_get_feature(struct ccw_device *, int);
 748 int dasd_set_feature(struct ccw_device *, int, int);
 749
 750 int dasd_add_sysfs_files(struct ccw_device *);
 751 void dasd_remove_sysfs_files(struct ccw_device *);
 752
 753 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 754 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
 755 struct dasd_device *dasd_device_from_devindex(int);
 756
 757 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
 758 struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
 759
 760 int dasd_parse(void);
 761 int dasd_busid_known(const char *);
 762
 763 /* externals in dasd_gendisk.c */
 764 int  dasd_gendisk_init(void);
 765 void dasd_gendisk_exit(void);
 766 int dasd_gendisk_alloc(struct dasd_block *);
 767 void dasd_gendisk_free(struct dasd_block *);
 768 int dasd_scan_partitions(struct dasd_block *);
 769 void dasd_destroy_partitions(struct dasd_block *);
 770
 771 /* externals in dasd_ioctl.c */
 772 int  dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
 773
 774 /* externals in dasd_proc.c */
 775 int dasd_proc_init(void);
 776 void dasd_proc_exit(void);
 777
 778 /* externals in dasd_erp.c */
 779 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 780 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
 781 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
 782                                             struct dasd_device *);
 783 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 784 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
 785 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
 786
 787 /* externals in dasd_3990_erp.c */
 788 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
 789 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
 790
 791 /* externals in dasd_eer.c */
 792 #ifdef CONFIG_DASD_EER
 793 int dasd_eer_init(void);
 794 void dasd_eer_exit(void);
 795 int dasd_eer_enable(struct dasd_device *);
 796 void dasd_eer_disable(struct dasd_device *);
 797 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
 798                     unsigned int id);
 799 void dasd_eer_snss(struct dasd_device *);
 800
 801 static inline int dasd_eer_enabled(struct dasd_device *device)
 802 {
 803         return device->eer_cqr != NULL;
 804 }
 805 #else
 806 #define dasd_eer_init()         (0)
 807 #define dasd_eer_exit()         do { } while (0)
 808 #define dasd_eer_enable(d)      (0)
 809 #define dasd_eer_disable(d)     do { } while (0)
 810 #define dasd_eer_write(d,c,i)   do { } while (0)
 811 #define dasd_eer_snss(d)        do { } while (0)
 812 #define dasd_eer_enabled(d)     (0)
 813 #endif  /* CONFIG_DASD_ERR */
 814
 815 #endif                          /* DASD_H */