drivers/s390/cio/device_ops.c

   1 /*
   2  *  drivers/s390/cio/device_ops.c
   3  *
   4  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
   5  *                       IBM Corporation
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
   7  *               Cornelia Huck (cornelia.huck@de.ibm.com)
   8  */
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/errno.h>
  12 #include <linux/slab.h>
  13 #include <linux/list.h>
  14 #include <linux/device.h>
  15 #include <linux/delay.h>
  16
  17 #include <asm/ccwdev.h>
  18 #include <asm/idals.h>
  19 #include <asm/chpid.h>
  20
  21 #include "cio.h"
  22 #include "cio_debug.h"
  23 #include "css.h"
  24 #include "chsc.h"
  25 #include "device.h"
  26 #include "chp.h"
  27
  28 int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags)
  29 {
  30        /*
  31         * The flag usage is mutal exclusive ...
  32         */
  33         if ((flags & CCWDEV_EARLY_NOTIFICATION) &&
  34             (flags & CCWDEV_REPORT_ALL))
  35                 return -EINVAL;
  36         cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
  37         cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
  38         cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
  39         cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
  40         return 0;
  41 }
  42
  43 int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
  44 {
  45        /*
  46         * The flag usage is mutal exclusive ...
  47         */
  48         if (((flags & CCWDEV_EARLY_NOTIFICATION) &&
  49             (flags & CCWDEV_REPORT_ALL)) ||
  50             ((flags & CCWDEV_EARLY_NOTIFICATION) &&
  51              cdev->private->options.repall) ||
  52             ((flags & CCWDEV_REPORT_ALL) &&
  53              cdev->private->options.fast))
  54                 return -EINVAL;
  55         cdev->private->options.fast |= (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
  56         cdev->private->options.repall |= (flags & CCWDEV_REPORT_ALL) != 0;
  57         cdev->private->options.pgroup |= (flags & CCWDEV_DO_PATHGROUP) != 0;
  58         cdev->private->options.force |= (flags & CCWDEV_ALLOW_FORCE) != 0;
  59         return 0;
  60 }
  61
  62 void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags)
  63 {
  64         cdev->private->options.fast &= (flags & CCWDEV_EARLY_NOTIFICATION) == 0;
  65         cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0;
  66         cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0;
  67         cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0;
  68 }
  69
  70 int
  71 ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
  72 {
  73         struct subchannel *sch;
  74         int ret;
  75
  76         if (!cdev)
  77                 return -ENODEV;
  78         if (cdev->private->state == DEV_STATE_NOT_OPER)
  79                 return -ENODEV;
  80         if (cdev->private->state != DEV_STATE_ONLINE &&
  81             cdev->private->state != DEV_STATE_W4SENSE)
  82                 return -EINVAL;
  83         sch = to_subchannel(cdev->dev.parent);
  84         if (!sch)
  85                 return -ENODEV;
  86         ret = cio_clear(sch);
  87         if (ret == 0)
  88                 cdev->private->intparm = intparm;
  89         return ret;
  90 }
  91
  92 int
  93 ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
  94                      unsigned long intparm, __u8 lpm, __u8 key,
  95                      unsigned long flags)
  96 {
  97         struct subchannel *sch;
  98         int ret;
  99
 100         if (!cdev)
 101                 return -ENODEV;
 102         sch = to_subchannel(cdev->dev.parent);
 103         if (!sch)
 104                 return -ENODEV;
 105         if (cdev->private->state == DEV_STATE_NOT_OPER)
 106                 return -ENODEV;
 107         if (cdev->private->state == DEV_STATE_VERIFY ||
 108             cdev->private->state == DEV_STATE_CLEAR_VERIFY) {
 109                 /* Remember to fake irb when finished. */
 110                 if (!cdev->private->flags.fake_irb) {
 111                         cdev->private->flags.fake_irb = 1;
 112                         cdev->private->intparm = intparm;
 113                         return 0;
 114                 } else
 115                         /* There's already a fake I/O around. */
 116                         return -EBUSY;
 117         }
 118         if (cdev->private->state != DEV_STATE_ONLINE ||
 119             ((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
 120              !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
 121             cdev->private->flags.doverify)
 122                 return -EBUSY;
 123         ret = cio_set_options (sch, flags);
 124         if (ret)
 125                 return ret;
 126         /* Adjust requested path mask to excluded varied off paths. */
 127         if (lpm) {
 128                 lpm &= sch->opm;
 129                 if (lpm == 0)
 130                         return -EACCES;
 131         }
 132         ret = cio_start_key (sch, cpa, lpm, key);
 133         if (ret == 0)
 134                 cdev->private->intparm = intparm;
 135         return ret;
 136 }
 137
 138
 139 int
 140 ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
 141                              unsigned long intparm, __u8 lpm, __u8 key,
 142                              unsigned long flags, int expires)
 143 {
 144         int ret;
 145
 146         if (!cdev)
 147                 return -ENODEV;
 148         ccw_device_set_timeout(cdev, expires);
 149         ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags);
 150         if (ret != 0)
 151                 ccw_device_set_timeout(cdev, 0);
 152         return ret;
 153 }
 154
 155 int
 156 ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa,
 157                  unsigned long intparm, __u8 lpm, unsigned long flags)
 158 {
 159         return ccw_device_start_key(cdev, cpa, intparm, lpm,
 160                                     PAGE_DEFAULT_KEY, flags);
 161 }
 162
 163 int
 164 ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
 165                          unsigned long intparm, __u8 lpm, unsigned long flags,
 166                          int expires)
 167 {
 168         return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
 169                                             PAGE_DEFAULT_KEY, flags,
 170                                             expires);
 171 }
 172
 173
 174 int
 175 ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
 176 {
 177         struct subchannel *sch;
 178         int ret;
 179
 180         if (!cdev)
 181                 return -ENODEV;
 182         if (cdev->private->state == DEV_STATE_NOT_OPER)
 183                 return -ENODEV;
 184         if (cdev->private->state != DEV_STATE_ONLINE &&
 185             cdev->private->state != DEV_STATE_W4SENSE)
 186                 return -EINVAL;
 187         sch = to_subchannel(cdev->dev.parent);
 188         if (!sch)
 189                 return -ENODEV;
 190         ret = cio_halt(sch);
 191         if (ret == 0)
 192                 cdev->private->intparm = intparm;
 193         return ret;
 194 }
 195
 196 int
 197 ccw_device_resume(struct ccw_device *cdev)
 198 {
 199         struct subchannel *sch;
 200
 201         if (!cdev)
 202                 return -ENODEV;
 203         sch = to_subchannel(cdev->dev.parent);
 204         if (!sch)
 205                 return -ENODEV;
 206         if (cdev->private->state == DEV_STATE_NOT_OPER)
 207                 return -ENODEV;
 208         if (cdev->private->state != DEV_STATE_ONLINE ||
 209             !(sch->schib.scsw.actl & SCSW_ACTL_SUSPENDED))
 210                 return -EINVAL;
 211         return cio_resume(sch);
 212 }
 213
 214 /*
 215  * Pass interrupt to device driver.
 216  */
 217 int
 218 ccw_device_call_handler(struct ccw_device *cdev)
 219 {
 220         struct subchannel *sch;
 221         unsigned int stctl;
 222         int ending_status;
 223
 224         sch = to_subchannel(cdev->dev.parent);
 225
 226         /*
 227          * we allow for the device action handler if .
 228          *  - we received ending status
 229          *  - the action handler requested to see all interrupts
 230          *  - we received an intermediate status
 231          *  - fast notification was requested (primary status)
 232          *  - unsolicited interrupts
 233          */
 234         stctl = cdev->private->irb.scsw.stctl;
 235         ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
 236                 (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
 237                 (stctl == SCSW_STCTL_STATUS_PEND);
 238         if (!ending_status &&
 239             !cdev->private->options.repall &&
 240             !(stctl & SCSW_STCTL_INTER_STATUS) &&
 241             !(cdev->private->options.fast &&
 242               (stctl & SCSW_STCTL_PRIM_STATUS)))
 243                 return 0;
 244
 245         /* Clear pending timers for device driver initiated I/O. */
 246         if (ending_status)
 247                 ccw_device_set_timeout(cdev, 0);
 248         /*
 249          * Now we are ready to call the device driver interrupt handler.
 250          */
 251         if (cdev->handler)
 252                 cdev->handler(cdev, cdev->private->intparm,
 253                               &cdev->private->irb);
 254
 255         /*
 256          * Clear the old and now useless interrupt response block.
 257          */
 258         memset(&cdev->private->irb, 0, sizeof(struct irb));
 259
 260         return 1;
 261 }
 262
 263 /*
 264  * Search for CIW command in extended sense data.
 265  */
 266 struct ciw *
 267 ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
 268 {
 269         int ciw_cnt;
 270
 271         if (cdev->private->flags.esid == 0)
 272                 return NULL;
 273         for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
 274                 if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
 275                         return cdev->private->senseid.ciw + ciw_cnt;
 276         return NULL;
 277 }
 278
 279 __u8
 280 ccw_device_get_path_mask(struct ccw_device *cdev)
 281 {
 282         struct subchannel *sch;
 283
 284         sch = to_subchannel(cdev->dev.parent);
 285         if (!sch)
 286                 return 0;
 287         else
 288                 return sch->lpm;
 289 }
 290
 291 static void
 292 ccw_device_wake_up(struct ccw_device *cdev, unsigned long ip, struct irb *irb)
 293 {
 294         if (!ip)
 295                 /* unsolicited interrupt */
 296                 return;
 297
 298         /* Abuse intparm for error reporting. */
 299         if (IS_ERR(irb))
 300                 cdev->private->intparm = -EIO;
 301         else if (irb->scsw.cc == 1)
 302                 /* Retry for deferred condition code. */
 303                 cdev->private->intparm = -EAGAIN;
 304         else if ((irb->scsw.dstat !=
 305                   (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
 306                  (irb->scsw.cstat != 0)) {
 307                 /*
 308                  * We didn't get channel end / device end. Check if path
 309                  * verification has been started; we can retry after it has
 310                  * finished. We also retry unit checks except for command reject
 311                  * or intervention required. Also check for long busy
 312                  * conditions.
 313                  */
 314                  if (cdev->private->flags.doverify ||
 315                          cdev->private->state == DEV_STATE_VERIFY)
 316                          cdev->private->intparm = -EAGAIN;
 317                 else if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 318                          !(irb->ecw[0] &
 319                            (SNS0_CMD_REJECT | SNS0_INTERVENTION_REQ)))
 320                         cdev->private->intparm = -EAGAIN;
 321                 else if ((irb->scsw.dstat & DEV_STAT_ATTENTION) &&
 322                          (irb->scsw.dstat & DEV_STAT_DEV_END) &&
 323                          (irb->scsw.dstat & DEV_STAT_UNIT_EXCEP))
 324                         cdev->private->intparm = -EAGAIN;
 325                  else
 326                          cdev->private->intparm = -EIO;
 327
 328         } else
 329                 cdev->private->intparm = 0;
 330         wake_up(&cdev->private->wait_q);
 331 }
 332
 333 static int
 334 __ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic, __u8 lpm)
 335 {
 336         int ret;
 337         struct subchannel *sch;
 338
 339         sch = to_subchannel(cdev->dev.parent);
 340         do {
 341                 ccw_device_set_timeout(cdev, 60 * HZ);
 342                 ret = cio_start (sch, ccw, lpm);
 343                 if (ret != 0)
 344                         ccw_device_set_timeout(cdev, 0);
 345                 if (ret == -EBUSY) {
 346                         /* Try again later. */
 347                         spin_unlock_irq(sch->lock);
 348                         msleep(10);
 349                         spin_lock_irq(sch->lock);
 350                         continue;
 351                 }
 352                 if (ret != 0)
 353                         /* Non-retryable error. */
 354                         break;
 355                 /* Wait for end of request. */
 356                 cdev->private->intparm = magic;
 357                 spin_unlock_irq(sch->lock);
 358                 wait_event(cdev->private->wait_q,
 359                            (cdev->private->intparm == -EIO) ||
 360                            (cdev->private->intparm == -EAGAIN) ||
 361                            (cdev->private->intparm == 0));
 362                 spin_lock_irq(sch->lock);
 363                 /* Check at least for channel end / device end */
 364                 if (cdev->private->intparm == -EIO) {
 365                         /* Non-retryable error. */
 366                         ret = -EIO;
 367                         break;
 368                 }
 369                 if (cdev->private->intparm == 0)
 370                         /* Success. */
 371                         break;
 372                 /* Try again later. */
 373                 spin_unlock_irq(sch->lock);
 374                 msleep(10);
 375                 spin_lock_irq(sch->lock);
 376         } while (1);
 377
 378         return ret;
 379 }
 380
 381 /**
 382  * read_dev_chars() - read device characteristics
 383  * @param cdev   target ccw device
 384  * @param buffer pointer to buffer for rdc data
 385  * @param length size of rdc data
 386  * @returns 0 for success, negative error value on failure
 387  *
 388  * Context:
 389  *   called for online device, lock not held
 390  **/
 391 int
 392 read_dev_chars (struct ccw_device *cdev, void **buffer, int length)
 393 {
 394         void (*handler)(struct ccw_device *, unsigned long, struct irb *);
 395         struct subchannel *sch;
 396         int ret;
 397         struct ccw1 *rdc_ccw;
 398
 399         if (!cdev)
 400                 return -ENODEV;
 401         if (!buffer || !length)
 402                 return -EINVAL;
 403         sch = to_subchannel(cdev->dev.parent);
 404
 405         CIO_TRACE_EVENT (4, "rddevch");
 406         CIO_TRACE_EVENT (4, sch->dev.bus_id);
 407
 408         rdc_ccw = kzalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
 409         if (!rdc_ccw)
 410                 return -ENOMEM;
 411         rdc_ccw->cmd_code = CCW_CMD_RDC;
 412         rdc_ccw->count = length;
 413         rdc_ccw->flags = CCW_FLAG_SLI;
 414         ret = set_normalized_cda (rdc_ccw, (*buffer));
 415         if (ret != 0) {
 416                 kfree(rdc_ccw);
 417                 return ret;
 418         }
 419
 420         spin_lock_irq(sch->lock);
 421         /* Save interrupt handler. */
 422         handler = cdev->handler;
 423         /* Temporarily install own handler. */
 424         cdev->handler = ccw_device_wake_up;
 425         if (cdev->private->state != DEV_STATE_ONLINE)
 426                 ret = -ENODEV;
 427         else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
 428                   !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
 429                  cdev->private->flags.doverify)
 430                 ret = -EBUSY;
 431         else
 432                 /* 0x00D9C4C3 == ebcdic "RDC" */
 433                 ret = __ccw_device_retry_loop(cdev, rdc_ccw, 0x00D9C4C3, 0);
 434
 435         /* Restore interrupt handler. */
 436         cdev->handler = handler;
 437         spin_unlock_irq(sch->lock);
 438
 439         clear_normalized_cda (rdc_ccw);
 440         kfree(rdc_ccw);
 441
 442         return ret;
 443 }
 444
 445 /*
 446  *  Read Configuration data using path mask
 447  */
 448 int
 449 read_conf_data_lpm (struct ccw_device *cdev, void **buffer, int *length, __u8 lpm)
 450 {
 451         void (*handler)(struct ccw_device *, unsigned long, struct irb *);
 452         struct subchannel *sch;
 453         struct ciw *ciw;
 454         char *rcd_buf;
 455         int ret;
 456         struct ccw1 *rcd_ccw;
 457
 458         if (!cdev)
 459                 return -ENODEV;
 460         if (!buffer || !length)
 461                 return -EINVAL;
 462         sch = to_subchannel(cdev->dev.parent);
 463
 464         CIO_TRACE_EVENT (4, "rdconf");
 465         CIO_TRACE_EVENT (4, sch->dev.bus_id);
 466
 467         /*
 468          * scan for RCD command in extended SenseID data
 469          */
 470         ciw = ccw_device_get_ciw(cdev, CIW_TYPE_RCD);
 471         if (!ciw || ciw->cmd == 0)
 472                 return -EOPNOTSUPP;
 473
 474         /* Adjust requested path mask to excluded varied off paths. */
 475         if (lpm) {
 476                 lpm &= sch->opm;
 477                 if (lpm == 0)
 478                         return -EACCES;
 479         }
 480
 481         rcd_ccw = kzalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
 482         if (!rcd_ccw)
 483                 return -ENOMEM;
 484         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 485         if (!rcd_buf) {
 486                 kfree(rcd_ccw);
 487                 return -ENOMEM;
 488         }
 489         rcd_ccw->cmd_code = ciw->cmd;
 490         rcd_ccw->cda = (__u32) __pa (rcd_buf);
 491         rcd_ccw->count = ciw->count;
 492         rcd_ccw->flags = CCW_FLAG_SLI;
 493
 494         spin_lock_irq(sch->lock);
 495         /* Save interrupt handler. */
 496         handler = cdev->handler;
 497         /* Temporarily install own handler. */
 498         cdev->handler = ccw_device_wake_up;
 499         if (cdev->private->state != DEV_STATE_ONLINE)
 500                 ret = -ENODEV;
 501         else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
 502                   !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
 503                  cdev->private->flags.doverify)
 504                 ret = -EBUSY;
 505         else
 506                 /* 0x00D9C3C4 == ebcdic "RCD" */
 507                 ret = __ccw_device_retry_loop(cdev, rcd_ccw, 0x00D9C3C4, lpm);
 508
 509         /* Restore interrupt handler. */
 510         cdev->handler = handler;
 511         spin_unlock_irq(sch->lock);
 512
 513         /*
 514          * on success we update the user input parms
 515          */
 516         if (ret) {
 517                 kfree (rcd_buf);
 518                 *buffer = NULL;
 519                 *length = 0;
 520         } else {
 521                 *length = ciw->count;
 522                 *buffer = rcd_buf;
 523         }
 524         kfree(rcd_ccw);
 525
 526         return ret;
 527 }
 528
 529 /*
 530  *  Read Configuration data
 531  */
 532 int
 533 read_conf_data (struct ccw_device *cdev, void **buffer, int *length)
 534 {
 535         return read_conf_data_lpm (cdev, buffer, length, 0);
 536 }
 537
 538 /*
 539  * Try to break the lock on a boxed device.
 540  */
 541 int
 542 ccw_device_stlck(struct ccw_device *cdev)
 543 {
 544         void *buf, *buf2;
 545         unsigned long flags;
 546         struct subchannel *sch;
 547         int ret;
 548
 549         if (!cdev)
 550                 return -ENODEV;
 551
 552         if (cdev->drv && !cdev->private->options.force)
 553                 return -EINVAL;
 554
 555         sch = to_subchannel(cdev->dev.parent);
 556
 557         CIO_TRACE_EVENT(2, "stl lock");
 558         CIO_TRACE_EVENT(2, cdev->dev.bus_id);
 559
 560         buf = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
 561         if (!buf)
 562                 return -ENOMEM;
 563         buf2 = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
 564         if (!buf2) {
 565                 kfree(buf);
 566                 return -ENOMEM;
 567         }
 568         spin_lock_irqsave(sch->lock, flags);
 569         ret = cio_enable_subchannel(sch, 3);
 570         if (ret)
 571                 goto out_unlock;
 572         /*
 573          * Setup ccw. We chain an unconditional reserve and a release so we
 574          * only break the lock.
 575          */
 576         cdev->private->iccws[0].cmd_code = CCW_CMD_STLCK;
 577         cdev->private->iccws[0].cda = (__u32) __pa(buf);
 578         cdev->private->iccws[0].count = 32;
 579         cdev->private->iccws[0].flags = CCW_FLAG_CC;
 580         cdev->private->iccws[1].cmd_code = CCW_CMD_RELEASE;
 581         cdev->private->iccws[1].cda = (__u32) __pa(buf2);
 582         cdev->private->iccws[1].count = 32;
 583         cdev->private->iccws[1].flags = 0;
 584         ret = cio_start(sch, cdev->private->iccws, 0);
 585         if (ret) {
 586                 cio_disable_subchannel(sch); //FIXME: return code?
 587                 goto out_unlock;
 588         }
 589         cdev->private->irb.scsw.actl |= SCSW_ACTL_START_PEND;
 590         spin_unlock_irqrestore(sch->lock, flags);
 591         wait_event(cdev->private->wait_q, cdev->private->irb.scsw.actl == 0);
 592         spin_lock_irqsave(sch->lock, flags);
 593         cio_disable_subchannel(sch); //FIXME: return code?
 594         if ((cdev->private->irb.scsw.dstat !=
 595              (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
 596             (cdev->private->irb.scsw.cstat != 0))
 597                 ret = -EIO;
 598         /* Clear irb. */
 599         memset(&cdev->private->irb, 0, sizeof(struct irb));
 600 out_unlock:
 601         kfree(buf);
 602         kfree(buf2);
 603         spin_unlock_irqrestore(sch->lock, flags);
 604         return ret;
 605 }
 606
 607 void *
 608 ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
 609 {
 610         struct subchannel *sch;
 611         struct chp_id chpid;
 612
 613         sch = to_subchannel(cdev->dev.parent);
 614         chp_id_init(&chpid);
 615         chpid.id = sch->schib.pmcw.chpid[chp_no];
 616         return chp_get_chp_desc(chpid);
 617 }
 618
 619 // FIXME: these have to go:
 620
 621 int
 622 _ccw_device_get_subchannel_number(struct ccw_device *cdev)
 623 {
 624         return cdev->private->schid.sch_no;
 625 }
 626
 627 int
 628 _ccw_device_get_device_number(struct ccw_device *cdev)
 629 {
 630         return cdev->private->dev_id.devno;
 631 }
 632
 633
 634 MODULE_LICENSE("GPL");
 635 EXPORT_SYMBOL(ccw_device_set_options_mask);
 636 EXPORT_SYMBOL(ccw_device_set_options);
 637 EXPORT_SYMBOL(ccw_device_clear_options);
 638 EXPORT_SYMBOL(ccw_device_clear);
 639 EXPORT_SYMBOL(ccw_device_halt);
 640 EXPORT_SYMBOL(ccw_device_resume);
 641 EXPORT_SYMBOL(ccw_device_start_timeout);
 642 EXPORT_SYMBOL(ccw_device_start);
 643 EXPORT_SYMBOL(ccw_device_start_timeout_key);
 644 EXPORT_SYMBOL(ccw_device_start_key);
 645 EXPORT_SYMBOL(ccw_device_get_ciw);
 646 EXPORT_SYMBOL(ccw_device_get_path_mask);
 647 EXPORT_SYMBOL(read_conf_data);
 648 EXPORT_SYMBOL(read_dev_chars);
 649 EXPORT_SYMBOL(_ccw_device_get_subchannel_number);
 650 EXPORT_SYMBOL(_ccw_device_get_device_number);
 651 EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);
 652 EXPORT_SYMBOL_GPL(read_conf_data_lpm);