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 #include <asm/fcx.h>
  21
  22 #include "cio.h"
  23 #include "cio_debug.h"
  24 #include "css.h"
  25 #include "chsc.h"
  26 #include "device.h"
  27 #include "chp.h"
  28
  29 /**
  30  * ccw_device_set_options_mask() - set some options and unset the rest
  31  * @cdev: device for which the options are to be set
  32  * @flags: options to be set
  33  *
  34  * All flags specified in @flags are set, all flags not specified in @flags
  35  * are cleared.
  36  * Returns:
  37  *   %0 on success, -%EINVAL on an invalid flag combination.
  38  */
  39 int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags)
  40 {
  41        /*
  42         * The flag usage is mutal exclusive ...
  43         */
  44         if ((flags & CCWDEV_EARLY_NOTIFICATION) &&
  45             (flags & CCWDEV_REPORT_ALL))
  46                 return -EINVAL;
  47         cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
  48         cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
  49         cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
  50         cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
  51         return 0;
  52 }
  53
  54 /**
  55  * ccw_device_set_options() - set some options
  56  * @cdev: device for which the options are to be set
  57  * @flags: options to be set
  58  *
  59  * All flags specified in @flags are set, the remainder is left untouched.
  60  * Returns:
  61  *   %0 on success, -%EINVAL if an invalid flag combination would ensue.
  62  */
  63 int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
  64 {
  65        /*
  66         * The flag usage is mutal exclusive ...
  67         */
  68         if (((flags & CCWDEV_EARLY_NOTIFICATION) &&
  69             (flags & CCWDEV_REPORT_ALL)) ||
  70             ((flags & CCWDEV_EARLY_NOTIFICATION) &&
  71              cdev->private->options.repall) ||
  72             ((flags & CCWDEV_REPORT_ALL) &&
  73              cdev->private->options.fast))
  74                 return -EINVAL;
  75         cdev->private->options.fast |= (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
  76         cdev->private->options.repall |= (flags & CCWDEV_REPORT_ALL) != 0;
  77         cdev->private->options.pgroup |= (flags & CCWDEV_DO_PATHGROUP) != 0;
  78         cdev->private->options.force |= (flags & CCWDEV_ALLOW_FORCE) != 0;
  79         return 0;
  80 }
  81
  82 /**
  83  * ccw_device_clear_options() - clear some options
  84  * @cdev: device for which the options are to be cleared
  85  * @flags: options to be cleared
  86  *
  87  * All flags specified in @flags are cleared, the remainder is left untouched.
  88  */
  89 void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags)
  90 {
  91         cdev->private->options.fast &= (flags & CCWDEV_EARLY_NOTIFICATION) == 0;
  92         cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0;
  93         cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0;
  94         cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0;
  95 }
  96
  97 /**
  98  * ccw_device_clear() - terminate I/O request processing
  99  * @cdev: target ccw device
 100  * @intparm: interruption parameter; value is only used if no I/O is
 101  *           outstanding, otherwise the intparm associated with the I/O request
 102  *           is returned
 103  *
 104  * ccw_device_clear() calls csch on @cdev's subchannel.
 105  * Returns:
 106  *  %0 on success,
 107  *  -%ENODEV on device not operational,
 108  *  -%EINVAL on invalid device state.
 109  * Context:
 110  *  Interrupts disabled, ccw device lock held
 111  */
 112 int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
 113 {
 114         struct subchannel *sch;
 115         int ret;
 116
 117         if (!cdev || !cdev->dev.parent)
 118                 return -ENODEV;
 119         if (cdev->private->state == DEV_STATE_NOT_OPER)
 120                 return -ENODEV;
 121         if (cdev->private->state != DEV_STATE_ONLINE &&
 122             cdev->private->state != DEV_STATE_W4SENSE)
 123                 return -EINVAL;
 124         sch = to_subchannel(cdev->dev.parent);
 125         ret = cio_clear(sch);
 126         if (ret == 0)
 127                 cdev->private->intparm = intparm;
 128         return ret;
 129 }
 130
 131 /**
 132  * ccw_device_start_key() - start a s390 channel program with key
 133  * @cdev: target ccw device
 134  * @cpa: logical start address of channel program
 135  * @intparm: user specific interruption parameter; will be presented back to
 136  *           @cdev's interrupt handler. Allows a device driver to associate
 137  *           the interrupt with a particular I/O request.
 138  * @lpm: defines the channel path to be used for a specific I/O request. A
 139  *       value of 0 will make cio use the opm.
 140  * @key: storage key to be used for the I/O
 141  * @flags: additional flags; defines the action to be performed for I/O
 142  *         processing.
 143  *
 144  * Start a S/390 channel program. When the interrupt arrives, the
 145  * IRQ handler is called, either immediately, delayed (dev-end missing,
 146  * or sense required) or never (no IRQ handler registered).
 147  * Returns:
 148  *  %0, if the operation was successful;
 149  *  -%EBUSY, if the device is busy, or status pending;
 150  *  -%EACCES, if no path specified in @lpm is operational;
 151  *  -%ENODEV, if the device is not operational.
 152  * Context:
 153  *  Interrupts disabled, ccw device lock held
 154  */
 155 int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
 156                          unsigned long intparm, __u8 lpm, __u8 key,
 157                          unsigned long flags)
 158 {
 159         struct subchannel *sch;
 160         int ret;
 161
 162         if (!cdev || !cdev->dev.parent)
 163                 return -ENODEV;
 164         sch = to_subchannel(cdev->dev.parent);
 165         if (cdev->private->state == DEV_STATE_NOT_OPER)
 166                 return -ENODEV;
 167         if (cdev->private->state == DEV_STATE_VERIFY ||
 168             cdev->private->state == DEV_STATE_CLEAR_VERIFY) {
 169                 /* Remember to fake irb when finished. */
 170                 if (!cdev->private->flags.fake_irb) {
 171                         cdev->private->flags.fake_irb = 1;
 172                         cdev->private->intparm = intparm;
 173                         return 0;
 174                 } else
 175                         /* There's already a fake I/O around. */
 176                         return -EBUSY;
 177         }
 178         if (cdev->private->state != DEV_STATE_ONLINE ||
 179             ((sch->schib.scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
 180              !(sch->schib.scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS)) ||
 181             cdev->private->flags.doverify)
 182                 return -EBUSY;
 183         ret = cio_set_options (sch, flags);
 184         if (ret)
 185                 return ret;
 186         /* Adjust requested path mask to excluded varied off paths. */
 187         if (lpm) {
 188                 lpm &= sch->opm;
 189                 if (lpm == 0)
 190                         return -EACCES;
 191         }
 192         ret = cio_start_key (sch, cpa, lpm, key);
 193         switch (ret) {
 194         case 0:
 195                 cdev->private->intparm = intparm;
 196                 break;
 197         case -EACCES:
 198         case -ENODEV:
 199                 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
 200                 break;
 201         }
 202         return ret;
 203 }
 204
 205 /**
 206  * ccw_device_start_timeout_key() - start a s390 channel program with timeout and key
 207  * @cdev: target ccw device
 208  * @cpa: logical start address of channel program
 209  * @intparm: user specific interruption parameter; will be presented back to
 210  *           @cdev's interrupt handler. Allows a device driver to associate
 211  *           the interrupt with a particular I/O request.
 212  * @lpm: defines the channel path to be used for a specific I/O request. A
 213  *       value of 0 will make cio use the opm.
 214  * @key: storage key to be used for the I/O
 215  * @flags: additional flags; defines the action to be performed for I/O
 216  *         processing.
 217  * @expires: timeout value in jiffies
 218  *
 219  * Start a S/390 channel program. When the interrupt arrives, the
 220  * IRQ handler is called, either immediately, delayed (dev-end missing,
 221  * or sense required) or never (no IRQ handler registered).
 222  * This function notifies the device driver if the channel program has not
 223  * completed during the time specified by @expires. If a timeout occurs, the
 224  * channel program is terminated via xsch, hsch or csch, and the device's
 225  * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
 226  * Returns:
 227  *  %0, if the operation was successful;
 228  *  -%EBUSY, if the device is busy, or status pending;
 229  *  -%EACCES, if no path specified in @lpm is operational;
 230  *  -%ENODEV, if the device is not operational.
 231  * Context:
 232  *  Interrupts disabled, ccw device lock held
 233  */
 234 int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
 235                                  unsigned long intparm, __u8 lpm, __u8 key,
 236                                  unsigned long flags, int expires)
 237 {
 238         int ret;
 239
 240         if (!cdev)
 241                 return -ENODEV;
 242         ccw_device_set_timeout(cdev, expires);
 243         ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags);
 244         if (ret != 0)
 245                 ccw_device_set_timeout(cdev, 0);
 246         return ret;
 247 }
 248
 249 /**
 250  * ccw_device_start() - start a s390 channel program
 251  * @cdev: target ccw device
 252  * @cpa: logical start address of channel program
 253  * @intparm: user specific interruption parameter; will be presented back to
 254  *           @cdev's interrupt handler. Allows a device driver to associate
 255  *           the interrupt with a particular I/O request.
 256  * @lpm: defines the channel path to be used for a specific I/O request. A
 257  *       value of 0 will make cio use the opm.
 258  * @flags: additional flags; defines the action to be performed for I/O
 259  *         processing.
 260  *
 261  * Start a S/390 channel program. When the interrupt arrives, the
 262  * IRQ handler is called, either immediately, delayed (dev-end missing,
 263  * or sense required) or never (no IRQ handler registered).
 264  * Returns:
 265  *  %0, if the operation was successful;
 266  *  -%EBUSY, if the device is busy, or status pending;
 267  *  -%EACCES, if no path specified in @lpm is operational;
 268  *  -%ENODEV, if the device is not operational.
 269  * Context:
 270  *  Interrupts disabled, ccw device lock held
 271  */
 272 int ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa,
 273                      unsigned long intparm, __u8 lpm, unsigned long flags)
 274 {
 275         return ccw_device_start_key(cdev, cpa, intparm, lpm,
 276                                     PAGE_DEFAULT_KEY, flags);
 277 }
 278
 279 /**
 280  * ccw_device_start_timeout() - start a s390 channel program with timeout
 281  * @cdev: target ccw device
 282  * @cpa: logical start address of channel program
 283  * @intparm: user specific interruption parameter; will be presented back to
 284  *           @cdev's interrupt handler. Allows a device driver to associate
 285  *           the interrupt with a particular I/O request.
 286  * @lpm: defines the channel path to be used for a specific I/O request. A
 287  *       value of 0 will make cio use the opm.
 288  * @flags: additional flags; defines the action to be performed for I/O
 289  *         processing.
 290  * @expires: timeout value in jiffies
 291  *
 292  * Start a S/390 channel program. When the interrupt arrives, the
 293  * IRQ handler is called, either immediately, delayed (dev-end missing,
 294  * or sense required) or never (no IRQ handler registered).
 295  * This function notifies the device driver if the channel program has not
 296  * completed during the time specified by @expires. If a timeout occurs, the
 297  * channel program is terminated via xsch, hsch or csch, and the device's
 298  * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
 299  * Returns:
 300  *  %0, if the operation was successful;
 301  *  -%EBUSY, if the device is busy, or status pending;
 302  *  -%EACCES, if no path specified in @lpm is operational;
 303  *  -%ENODEV, if the device is not operational.
 304  * Context:
 305  *  Interrupts disabled, ccw device lock held
 306  */
 307 int ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
 308                              unsigned long intparm, __u8 lpm,
 309                              unsigned long flags, int expires)
 310 {
 311         return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
 312                                             PAGE_DEFAULT_KEY, flags,
 313                                             expires);
 314 }
 315
 316
 317 /**
 318  * ccw_device_halt() - halt I/O request processing
 319  * @cdev: target ccw device
 320  * @intparm: interruption parameter; value is only used if no I/O is
 321  *           outstanding, otherwise the intparm associated with the I/O request
 322  *           is returned
 323  *
 324  * ccw_device_halt() calls hsch on @cdev's subchannel.
 325  * Returns:
 326  *  %0 on success,
 327  *  -%ENODEV on device not operational,
 328  *  -%EINVAL on invalid device state,
 329  *  -%EBUSY on device busy or interrupt pending.
 330  * Context:
 331  *  Interrupts disabled, ccw device lock held
 332  */
 333 int ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
 334 {
 335         struct subchannel *sch;
 336         int ret;
 337
 338         if (!cdev || !cdev->dev.parent)
 339                 return -ENODEV;
 340         if (cdev->private->state == DEV_STATE_NOT_OPER)
 341                 return -ENODEV;
 342         if (cdev->private->state != DEV_STATE_ONLINE &&
 343             cdev->private->state != DEV_STATE_W4SENSE)
 344                 return -EINVAL;
 345         sch = to_subchannel(cdev->dev.parent);
 346         ret = cio_halt(sch);
 347         if (ret == 0)
 348                 cdev->private->intparm = intparm;
 349         return ret;
 350 }
 351
 352 /**
 353  * ccw_device_resume() - resume channel program execution
 354  * @cdev: target ccw device
 355  *
 356  * ccw_device_resume() calls rsch on @cdev's subchannel.
 357  * Returns:
 358  *  %0 on success,
 359  *  -%ENODEV on device not operational,
 360  *  -%EINVAL on invalid device state,
 361  *  -%EBUSY on device busy or interrupt pending.
 362  * Context:
 363  *  Interrupts disabled, ccw device lock held
 364  */
 365 int ccw_device_resume(struct ccw_device *cdev)
 366 {
 367         struct subchannel *sch;
 368
 369         if (!cdev || !cdev->dev.parent)
 370                 return -ENODEV;
 371         sch = to_subchannel(cdev->dev.parent);
 372         if (cdev->private->state == DEV_STATE_NOT_OPER)
 373                 return -ENODEV;
 374         if (cdev->private->state != DEV_STATE_ONLINE ||
 375             !(sch->schib.scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
 376                 return -EINVAL;
 377         return cio_resume(sch);
 378 }
 379
 380 /*
 381  * Pass interrupt to device driver.
 382  */
 383 int
 384 ccw_device_call_handler(struct ccw_device *cdev)
 385 {
 386         struct subchannel *sch;
 387         unsigned int stctl;
 388         int ending_status;
 389
 390         sch = to_subchannel(cdev->dev.parent);
 391
 392         /*
 393          * we allow for the device action handler if .
 394          *  - we received ending status
 395          *  - the action handler requested to see all interrupts
 396          *  - we received an intermediate status
 397          *  - fast notification was requested (primary status)
 398          *  - unsolicited interrupts
 399          */
 400         stctl = scsw_stctl(&cdev->private->irb.scsw);
 401         ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
 402                 (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
 403                 (stctl == SCSW_STCTL_STATUS_PEND);
 404         if (!ending_status &&
 405             !cdev->private->options.repall &&
 406             !(stctl & SCSW_STCTL_INTER_STATUS) &&
 407             !(cdev->private->options.fast &&
 408               (stctl & SCSW_STCTL_PRIM_STATUS)))
 409                 return 0;
 410
 411         /* Clear pending timers for device driver initiated I/O. */
 412         if (ending_status)
 413                 ccw_device_set_timeout(cdev, 0);
 414         /*
 415          * Now we are ready to call the device driver interrupt handler.
 416          */
 417         if (cdev->handler)
 418                 cdev->handler(cdev, cdev->private->intparm,
 419                               &cdev->private->irb);
 420
 421         /*
 422          * Clear the old and now useless interrupt response block.
 423          */
 424         memset(&cdev->private->irb, 0, sizeof(struct irb));
 425
 426         return 1;
 427 }
 428
 429 /**
 430  * ccw_device_get_ciw() - Search for CIW command in extended sense data.
 431  * @cdev: ccw device to inspect
 432  * @ct: command type to look for
 433  *
 434  * During SenseID, command information words (CIWs) describing special
 435  * commands available to the device may have been stored in the extended
 436  * sense data. This function searches for CIWs of a specified command
 437  * type in the extended sense data.
 438  * Returns:
 439  *  %NULL if no extended sense data has been stored or if no CIW of the
 440  *  specified command type could be found,
 441  *  else a pointer to the CIW of the specified command type.
 442  */
 443 struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
 444 {
 445         int ciw_cnt;
 446
 447         if (cdev->private->flags.esid == 0)
 448                 return NULL;
 449         for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
 450                 if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
 451                         return cdev->private->senseid.ciw + ciw_cnt;
 452         return NULL;
 453 }
 454
 455 /**
 456  * ccw_device_get_path_mask() - get currently available paths
 457  * @cdev: ccw device to be queried
 458  * Returns:
 459  *  %0 if no subchannel for the device is available,
 460  *  else the mask of currently available paths for the ccw device's subchannel.
 461  */
 462 __u8 ccw_device_get_path_mask(struct ccw_device *cdev)
 463 {
 464         struct subchannel *sch;
 465
 466         if (!cdev->dev.parent)
 467                 return 0;
 468
 469         sch = to_subchannel(cdev->dev.parent);
 470         return sch->lpm;
 471 }
 472
 473 /*
 474  * Try to break the lock on a boxed device.
 475  */
 476 int
 477 ccw_device_stlck(struct ccw_device *cdev)
 478 {
 479         void *buf, *buf2;
 480         unsigned long flags;
 481         struct subchannel *sch;
 482         int ret;
 483
 484         if (!cdev)
 485                 return -ENODEV;
 486
 487         if (cdev->drv && !cdev->private->options.force)
 488                 return -EINVAL;
 489
 490         sch = to_subchannel(cdev->dev.parent);
 491
 492         CIO_TRACE_EVENT(2, "stl lock");
 493         CIO_TRACE_EVENT(2, dev_name(&cdev->dev));
 494
 495         buf = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
 496         if (!buf)
 497                 return -ENOMEM;
 498         buf2 = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
 499         if (!buf2) {
 500                 kfree(buf);
 501                 return -ENOMEM;
 502         }
 503         spin_lock_irqsave(sch->lock, flags);
 504         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 505         if (ret)
 506                 goto out_unlock;
 507         /*
 508          * Setup ccw. We chain an unconditional reserve and a release so we
 509          * only break the lock.
 510          */
 511         cdev->private->iccws[0].cmd_code = CCW_CMD_STLCK;
 512         cdev->private->iccws[0].cda = (__u32) __pa(buf);
 513         cdev->private->iccws[0].count = 32;
 514         cdev->private->iccws[0].flags = CCW_FLAG_CC;
 515         cdev->private->iccws[1].cmd_code = CCW_CMD_RELEASE;
 516         cdev->private->iccws[1].cda = (__u32) __pa(buf2);
 517         cdev->private->iccws[1].count = 32;
 518         cdev->private->iccws[1].flags = 0;
 519         ret = cio_start(sch, cdev->private->iccws, 0);
 520         if (ret) {
 521                 cio_disable_subchannel(sch); //FIXME: return code?
 522                 goto out_unlock;
 523         }
 524         cdev->private->irb.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
 525         spin_unlock_irqrestore(sch->lock, flags);
 526         wait_event(cdev->private->wait_q,
 527                    cdev->private->irb.scsw.cmd.actl == 0);
 528         spin_lock_irqsave(sch->lock, flags);
 529         cio_disable_subchannel(sch); //FIXME: return code?
 530         if ((cdev->private->irb.scsw.cmd.dstat !=
 531              (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
 532             (cdev->private->irb.scsw.cmd.cstat != 0))
 533                 ret = -EIO;
 534         /* Clear irb. */
 535         memset(&cdev->private->irb, 0, sizeof(struct irb));
 536 out_unlock:
 537         kfree(buf);
 538         kfree(buf2);
 539         spin_unlock_irqrestore(sch->lock, flags);
 540         return ret;
 541 }
 542
 543 void *ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
 544 {
 545         struct subchannel *sch;
 546         struct chp_id chpid;
 547
 548         sch = to_subchannel(cdev->dev.parent);
 549         chp_id_init(&chpid);
 550         chpid.id = sch->schib.pmcw.chpid[chp_no];
 551         return chp_get_chp_desc(chpid);
 552 }
 553
 554 /**
 555  * ccw_device_get_id - obtain a ccw device id
 556  * @cdev: device to obtain the id for
 557  * @dev_id: where to fill in the values
 558  */
 559 void ccw_device_get_id(struct ccw_device *cdev, struct ccw_dev_id *dev_id)
 560 {
 561         *dev_id = cdev->private->dev_id;
 562 }
 563 EXPORT_SYMBOL(ccw_device_get_id);
 564
 565 /**
 566  * ccw_device_tm_start_key - perform start function
 567  * @cdev: ccw device on which to perform the start function
 568  * @tcw: transport-command word to be started
 569  * @intparm: user defined parameter to be passed to the interrupt handler
 570  * @lpm: mask of paths to use
 571  * @key: storage key to use for storage access
 572  *
 573  * Start the tcw on the given ccw device. Return zero on success, non-zero
 574  * otherwise.
 575  */
 576 int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
 577                             unsigned long intparm, u8 lpm, u8 key)
 578 {
 579         struct subchannel *sch;
 580         int rc;
 581
 582         sch = to_subchannel(cdev->dev.parent);
 583         if (cdev->private->state != DEV_STATE_ONLINE)
 584                 return -EIO;
 585         /* Adjust requested path mask to excluded varied off paths. */
 586         if (lpm) {
 587                 lpm &= sch->opm;
 588                 if (lpm == 0)
 589                         return -EACCES;
 590         }
 591         rc = cio_tm_start_key(sch, tcw, lpm, key);
 592         if (rc == 0)
 593                 cdev->private->intparm = intparm;
 594         return rc;
 595 }
 596 EXPORT_SYMBOL(ccw_device_tm_start_key);
 597
 598 /**
 599  * ccw_device_tm_start_timeout_key - perform start function
 600  * @cdev: ccw device on which to perform the start function
 601  * @tcw: transport-command word to be started
 602  * @intparm: user defined parameter to be passed to the interrupt handler
 603  * @lpm: mask of paths to use
 604  * @key: storage key to use for storage access
 605  * @expires: time span in jiffies after which to abort request
 606  *
 607  * Start the tcw on the given ccw device. Return zero on success, non-zero
 608  * otherwise.
 609  */
 610 int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw,
 611                                     unsigned long intparm, u8 lpm, u8 key,
 612                                     int expires)
 613 {
 614         int ret;
 615
 616         ccw_device_set_timeout(cdev, expires);
 617         ret = ccw_device_tm_start_key(cdev, tcw, intparm, lpm, key);
 618         if (ret != 0)
 619                 ccw_device_set_timeout(cdev, 0);
 620         return ret;
 621 }
 622 EXPORT_SYMBOL(ccw_device_tm_start_timeout_key);
 623
 624 /**
 625  * ccw_device_tm_start - perform start function
 626  * @cdev: ccw device on which to perform the start function
 627  * @tcw: transport-command word to be started
 628  * @intparm: user defined parameter to be passed to the interrupt handler
 629  * @lpm: mask of paths to use
 630  *
 631  * Start the tcw on the given ccw device. Return zero on success, non-zero
 632  * otherwise.
 633  */
 634 int ccw_device_tm_start(struct ccw_device *cdev, struct tcw *tcw,
 635                         unsigned long intparm, u8 lpm)
 636 {
 637         return ccw_device_tm_start_key(cdev, tcw, intparm, lpm,
 638                                        PAGE_DEFAULT_KEY);
 639 }
 640 EXPORT_SYMBOL(ccw_device_tm_start);
 641
 642 /**
 643  * ccw_device_tm_start_timeout - perform start function
 644  * @cdev: ccw device on which to perform the start function
 645  * @tcw: transport-command word to be started
 646  * @intparm: user defined parameter to be passed to the interrupt handler
 647  * @lpm: mask of paths to use
 648  * @expires: time span in jiffies after which to abort request
 649  *
 650  * Start the tcw on the given ccw device. Return zero on success, non-zero
 651  * otherwise.
 652  */
 653 int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw,
 654                                unsigned long intparm, u8 lpm, int expires)
 655 {
 656         return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm,
 657                                                PAGE_DEFAULT_KEY, expires);
 658 }
 659 EXPORT_SYMBOL(ccw_device_tm_start_timeout);
 660
 661 /**
 662  * ccw_device_tm_intrg - perform interrogate function
 663  * @cdev: ccw device on which to perform the interrogate function
 664  *
 665  * Perform an interrogate function on the given ccw device. Return zero on
 666  * success, non-zero otherwise.
 667  */
 668 int ccw_device_tm_intrg(struct ccw_device *cdev)
 669 {
 670         struct subchannel *sch = to_subchannel(cdev->dev.parent);
 671
 672         if (cdev->private->state != DEV_STATE_ONLINE)
 673                 return -EIO;
 674         if (!scsw_is_tm(&sch->schib.scsw) ||
 675             !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_START_PEND))
 676                 return -EINVAL;
 677         return cio_tm_intrg(sch);
 678 }
 679 EXPORT_SYMBOL(ccw_device_tm_intrg);
 680
 681 // FIXME: these have to go:
 682
 683 int
 684 _ccw_device_get_subchannel_number(struct ccw_device *cdev)
 685 {
 686         return cdev->private->schid.sch_no;
 687 }
 688
 689
 690 MODULE_LICENSE("GPL");
 691 EXPORT_SYMBOL(ccw_device_set_options_mask);
 692 EXPORT_SYMBOL(ccw_device_set_options);
 693 EXPORT_SYMBOL(ccw_device_clear_options);
 694 EXPORT_SYMBOL(ccw_device_clear);
 695 EXPORT_SYMBOL(ccw_device_halt);
 696 EXPORT_SYMBOL(ccw_device_resume);
 697 EXPORT_SYMBOL(ccw_device_start_timeout);
 698 EXPORT_SYMBOL(ccw_device_start);
 699 EXPORT_SYMBOL(ccw_device_start_timeout_key);
 700 EXPORT_SYMBOL(ccw_device_start_key);
 701 EXPORT_SYMBOL(ccw_device_get_ciw);
 702 EXPORT_SYMBOL(ccw_device_get_path_mask);
 703 EXPORT_SYMBOL(_ccw_device_get_subchannel_number);
 704 EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);