drivers/s390/cio/device_ops.c

   1 /*
   2  * Copyright IBM Corp. 2002, 2009
   3  *
   4  * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
   5  *            Cornelia Huck (cornelia.huck@de.ibm.com)
   6  *
   7  * License: GPL
   8  */
   9 #include <linux/export.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 #include <linux/completion.h>
  17
  18 #include <asm/ccwdev.h>
  19 #include <asm/idals.h>
  20 #include <asm/chpid.h>
  21 #include <asm/fcx.h>
  22
  23 #include "cio.h"
  24 #include "cio_debug.h"
  25 #include "css.h"
  26 #include "chsc.h"
  27 #include "device.h"
  28 #include "chp.h"
  29
  30 /**
  31  * ccw_device_set_options_mask() - set some options and unset the rest
  32  * @cdev: device for which the options are to be set
  33  * @flags: options to be set
  34  *
  35  * All flags specified in @flags are set, all flags not specified in @flags
  36  * are cleared.
  37  * Returns:
  38  *   %0 on success, -%EINVAL on an invalid flag combination.
  39  */
  40 int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags)
  41 {
  42        /*
  43         * The flag usage is mutal exclusive ...
  44         */
  45         if ((flags & CCWDEV_EARLY_NOTIFICATION) &&
  46             (flags & CCWDEV_REPORT_ALL))
  47                 return -EINVAL;
  48         cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
  49         cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
  50         cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
  51         cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
  52         cdev->private->options.mpath = (flags & CCWDEV_DO_MULTIPATH) != 0;
  53         return 0;
  54 }
  55
  56 /**
  57  * ccw_device_set_options() - set some options
  58  * @cdev: device for which the options are to be set
  59  * @flags: options to be set
  60  *
  61  * All flags specified in @flags are set, the remainder is left untouched.
  62  * Returns:
  63  *   %0 on success, -%EINVAL if an invalid flag combination would ensue.
  64  */
  65 int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
  66 {
  67        /*
  68         * The flag usage is mutal exclusive ...
  69         */
  70         if (((flags & CCWDEV_EARLY_NOTIFICATION) &&
  71             (flags & CCWDEV_REPORT_ALL)) ||
  72             ((flags & CCWDEV_EARLY_NOTIFICATION) &&
  73              cdev->private->options.repall) ||
  74             ((flags & CCWDEV_REPORT_ALL) &&
  75              cdev->private->options.fast))
  76                 return -EINVAL;
  77         cdev->private->options.fast |= (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
  78         cdev->private->options.repall |= (flags & CCWDEV_REPORT_ALL) != 0;
  79         cdev->private->options.pgroup |= (flags & CCWDEV_DO_PATHGROUP) != 0;
  80         cdev->private->options.force |= (flags & CCWDEV_ALLOW_FORCE) != 0;
  81         cdev->private->options.mpath |= (flags & CCWDEV_DO_MULTIPATH) != 0;
  82         return 0;
  83 }
  84
  85 /**
  86  * ccw_device_clear_options() - clear some options
  87  * @cdev: device for which the options are to be cleared
  88  * @flags: options to be cleared
  89  *
  90  * All flags specified in @flags are cleared, the remainder is left untouched.
  91  */
  92 void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags)
  93 {
  94         cdev->private->options.fast &= (flags & CCWDEV_EARLY_NOTIFICATION) == 0;
  95         cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0;
  96         cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0;
  97         cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0;
  98         cdev->private->options.mpath &= (flags & CCWDEV_DO_MULTIPATH) == 0;
  99 }
 100
 101 /**
 102  * ccw_device_is_pathgroup() - determine if paths to this device are grouped
 103  * @cdev: ccw device
 104  *
 105  * Return non-zero if there is a path group, zero otherwise.
 106  */
 107 int ccw_device_is_pathgroup(struct ccw_device *cdev)
 108 {
 109         return cdev->private->flags.pgroup;
 110 }
 111 EXPORT_SYMBOL(ccw_device_is_pathgroup);
 112
 113 /**
 114  * ccw_device_is_multipath() - determine if device is operating in multipath mode
 115  * @cdev: ccw device
 116  *
 117  * Return non-zero if device is operating in multipath mode, zero otherwise.
 118  */
 119 int ccw_device_is_multipath(struct ccw_device *cdev)
 120 {
 121         return cdev->private->flags.mpath;
 122 }
 123 EXPORT_SYMBOL(ccw_device_is_multipath);
 124
 125 /**
 126  * ccw_device_clear() - terminate I/O request processing
 127  * @cdev: target ccw device
 128  * @intparm: interruption parameter; value is only used if no I/O is
 129  *           outstanding, otherwise the intparm associated with the I/O request
 130  *           is returned
 131  *
 132  * ccw_device_clear() calls csch on @cdev's subchannel.
 133  * Returns:
 134  *  %0 on success,
 135  *  -%ENODEV on device not operational,
 136  *  -%EINVAL on invalid device state.
 137  * Context:
 138  *  Interrupts disabled, ccw device lock held
 139  */
 140 int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
 141 {
 142         struct subchannel *sch;
 143         int ret;
 144
 145         if (!cdev || !cdev->dev.parent)
 146                 return -ENODEV;
 147         sch = to_subchannel(cdev->dev.parent);
 148         if (!sch->schib.pmcw.ena)
 149                 return -EINVAL;
 150         if (cdev->private->state == DEV_STATE_NOT_OPER)
 151                 return -ENODEV;
 152         if (cdev->private->state != DEV_STATE_ONLINE &&
 153             cdev->private->state != DEV_STATE_W4SENSE)
 154                 return -EINVAL;
 155
 156         ret = cio_clear(sch);
 157         if (ret == 0)
 158                 cdev->private->intparm = intparm;
 159         return ret;
 160 }
 161
 162 /**
 163  * ccw_device_start_key() - start a s390 channel program with key
 164  * @cdev: target ccw device
 165  * @cpa: logical start address of channel program
 166  * @intparm: user specific interruption parameter; will be presented back to
 167  *           @cdev's interrupt handler. Allows a device driver to associate
 168  *           the interrupt with a particular I/O request.
 169  * @lpm: defines the channel path to be used for a specific I/O request. A
 170  *       value of 0 will make cio use the opm.
 171  * @key: storage key to be used for the I/O
 172  * @flags: additional flags; defines the action to be performed for I/O
 173  *         processing.
 174  *
 175  * Start a S/390 channel program. When the interrupt arrives, the
 176  * IRQ handler is called, either immediately, delayed (dev-end missing,
 177  * or sense required) or never (no IRQ handler registered).
 178  * Returns:
 179  *  %0, if the operation was successful;
 180  *  -%EBUSY, if the device is busy, or status pending;
 181  *  -%EACCES, if no path specified in @lpm is operational;
 182  *  -%ENODEV, if the device is not operational.
 183  * Context:
 184  *  Interrupts disabled, ccw device lock held
 185  */
 186 int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
 187                          unsigned long intparm, __u8 lpm, __u8 key,
 188                          unsigned long flags)
 189 {
 190         struct subchannel *sch;
 191         int ret;
 192
 193         if (!cdev || !cdev->dev.parent)
 194                 return -ENODEV;
 195         sch = to_subchannel(cdev->dev.parent);
 196         if (!sch->schib.pmcw.ena)
 197                 return -EINVAL;
 198         if (cdev->private->state == DEV_STATE_NOT_OPER)
 199                 return -ENODEV;
 200         if (cdev->private->state == DEV_STATE_VERIFY) {
 201                 /* Remember to fake irb when finished. */
 202                 if (!cdev->private->flags.fake_irb) {
 203                         cdev->private->flags.fake_irb = FAKE_CMD_IRB;
 204                         cdev->private->intparm = intparm;
 205                         return 0;
 206                 } else
 207                         /* There's already a fake I/O around. */
 208                         return -EBUSY;
 209         }
 210         if (cdev->private->state != DEV_STATE_ONLINE ||
 211             ((sch->schib.scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
 212              !(sch->schib.scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS)) ||
 213             cdev->private->flags.doverify)
 214                 return -EBUSY;
 215         ret = cio_set_options (sch, flags);
 216         if (ret)
 217                 return ret;
 218         /* Adjust requested path mask to exclude unusable paths. */
 219         if (lpm) {
 220                 lpm &= sch->lpm;
 221                 if (lpm == 0)
 222                         return -EACCES;
 223         }
 224         ret = cio_start_key (sch, cpa, lpm, key);
 225         switch (ret) {
 226         case 0:
 227                 cdev->private->intparm = intparm;
 228                 break;
 229         case -EACCES:
 230         case -ENODEV:
 231                 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
 232                 break;
 233         }
 234         return ret;
 235 }
 236
 237 /**
 238  * ccw_device_start_timeout_key() - start a s390 channel program with timeout and key
 239  * @cdev: target ccw device
 240  * @cpa: logical start address of channel program
 241  * @intparm: user specific interruption parameter; will be presented back to
 242  *           @cdev's interrupt handler. Allows a device driver to associate
 243  *           the interrupt with a particular I/O request.
 244  * @lpm: defines the channel path to be used for a specific I/O request. A
 245  *       value of 0 will make cio use the opm.
 246  * @key: storage key to be used for the I/O
 247  * @flags: additional flags; defines the action to be performed for I/O
 248  *         processing.
 249  * @expires: timeout value in jiffies
 250  *
 251  * Start a S/390 channel program. When the interrupt arrives, the
 252  * IRQ handler is called, either immediately, delayed (dev-end missing,
 253  * or sense required) or never (no IRQ handler registered).
 254  * This function notifies the device driver if the channel program has not
 255  * completed during the time specified by @expires. If a timeout occurs, the
 256  * channel program is terminated via xsch, hsch or csch, and the device's
 257  * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
 258  * Returns:
 259  *  %0, if the operation was successful;
 260  *  -%EBUSY, if the device is busy, or status pending;
 261  *  -%EACCES, if no path specified in @lpm is operational;
 262  *  -%ENODEV, if the device is not operational.
 263  * Context:
 264  *  Interrupts disabled, ccw device lock held
 265  */
 266 int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
 267                                  unsigned long intparm, __u8 lpm, __u8 key,
 268                                  unsigned long flags, int expires)
 269 {
 270         int ret;
 271
 272         if (!cdev)
 273                 return -ENODEV;
 274         ccw_device_set_timeout(cdev, expires);
 275         ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags);
 276         if (ret != 0)
 277                 ccw_device_set_timeout(cdev, 0);
 278         return ret;
 279 }
 280
 281 /**
 282  * ccw_device_start() - start a s390 channel program
 283  * @cdev: target ccw device
 284  * @cpa: logical start address of channel program
 285  * @intparm: user specific interruption parameter; will be presented back to
 286  *           @cdev's interrupt handler. Allows a device driver to associate
 287  *           the interrupt with a particular I/O request.
 288  * @lpm: defines the channel path to be used for a specific I/O request. A
 289  *       value of 0 will make cio use the opm.
 290  * @flags: additional flags; defines the action to be performed for I/O
 291  *         processing.
 292  *
 293  * Start a S/390 channel program. When the interrupt arrives, the
 294  * IRQ handler is called, either immediately, delayed (dev-end missing,
 295  * or sense required) or never (no IRQ handler registered).
 296  * Returns:
 297  *  %0, if the operation was successful;
 298  *  -%EBUSY, if the device is busy, or status pending;
 299  *  -%EACCES, if no path specified in @lpm is operational;
 300  *  -%ENODEV, if the device is not operational.
 301  * Context:
 302  *  Interrupts disabled, ccw device lock held
 303  */
 304 int ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa,
 305                      unsigned long intparm, __u8 lpm, unsigned long flags)
 306 {
 307         return ccw_device_start_key(cdev, cpa, intparm, lpm,
 308                                     PAGE_DEFAULT_KEY, flags);
 309 }
 310
 311 /**
 312  * ccw_device_start_timeout() - start a s390 channel program with timeout
 313  * @cdev: target ccw device
 314  * @cpa: logical start address of channel program
 315  * @intparm: user specific interruption parameter; will be presented back to
 316  *           @cdev's interrupt handler. Allows a device driver to associate
 317  *           the interrupt with a particular I/O request.
 318  * @lpm: defines the channel path to be used for a specific I/O request. A
 319  *       value of 0 will make cio use the opm.
 320  * @flags: additional flags; defines the action to be performed for I/O
 321  *         processing.
 322  * @expires: timeout value in jiffies
 323  *
 324  * Start a S/390 channel program. When the interrupt arrives, the
 325  * IRQ handler is called, either immediately, delayed (dev-end missing,
 326  * or sense required) or never (no IRQ handler registered).
 327  * This function notifies the device driver if the channel program has not
 328  * completed during the time specified by @expires. If a timeout occurs, the
 329  * channel program is terminated via xsch, hsch or csch, and the device's
 330  * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
 331  * Returns:
 332  *  %0, if the operation was successful;
 333  *  -%EBUSY, if the device is busy, or status pending;
 334  *  -%EACCES, if no path specified in @lpm is operational;
 335  *  -%ENODEV, if the device is not operational.
 336  * Context:
 337  *  Interrupts disabled, ccw device lock held
 338  */
 339 int ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
 340                              unsigned long intparm, __u8 lpm,
 341                              unsigned long flags, int expires)
 342 {
 343         return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
 344                                             PAGE_DEFAULT_KEY, flags,
 345                                             expires);
 346 }
 347
 348
 349 /**
 350  * ccw_device_halt() - halt I/O request processing
 351  * @cdev: target ccw device
 352  * @intparm: interruption parameter; value is only used if no I/O is
 353  *           outstanding, otherwise the intparm associated with the I/O request
 354  *           is returned
 355  *
 356  * ccw_device_halt() calls hsch 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_halt(struct ccw_device *cdev, unsigned long intparm)
 366 {
 367         struct subchannel *sch;
 368         int ret;
 369
 370         if (!cdev || !cdev->dev.parent)
 371                 return -ENODEV;
 372         sch = to_subchannel(cdev->dev.parent);
 373         if (!sch->schib.pmcw.ena)
 374                 return -EINVAL;
 375         if (cdev->private->state == DEV_STATE_NOT_OPER)
 376                 return -ENODEV;
 377         if (cdev->private->state != DEV_STATE_ONLINE &&
 378             cdev->private->state != DEV_STATE_W4SENSE)
 379                 return -EINVAL;
 380
 381         ret = cio_halt(sch);
 382         if (ret == 0)
 383                 cdev->private->intparm = intparm;
 384         return ret;
 385 }
 386
 387 /**
 388  * ccw_device_resume() - resume channel program execution
 389  * @cdev: target ccw device
 390  *
 391  * ccw_device_resume() calls rsch on @cdev's subchannel.
 392  * Returns:
 393  *  %0 on success,
 394  *  -%ENODEV on device not operational,
 395  *  -%EINVAL on invalid device state,
 396  *  -%EBUSY on device busy or interrupt pending.
 397  * Context:
 398  *  Interrupts disabled, ccw device lock held
 399  */
 400 int ccw_device_resume(struct ccw_device *cdev)
 401 {
 402         struct subchannel *sch;
 403
 404         if (!cdev || !cdev->dev.parent)
 405                 return -ENODEV;
 406         sch = to_subchannel(cdev->dev.parent);
 407         if (!sch->schib.pmcw.ena)
 408                 return -EINVAL;
 409         if (cdev->private->state == DEV_STATE_NOT_OPER)
 410                 return -ENODEV;
 411         if (cdev->private->state != DEV_STATE_ONLINE ||
 412             !(sch->schib.scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
 413                 return -EINVAL;
 414         return cio_resume(sch);
 415 }
 416
 417 /**
 418  * ccw_device_get_ciw() - Search for CIW command in extended sense data.
 419  * @cdev: ccw device to inspect
 420  * @ct: command type to look for
 421  *
 422  * During SenseID, command information words (CIWs) describing special
 423  * commands available to the device may have been stored in the extended
 424  * sense data. This function searches for CIWs of a specified command
 425  * type in the extended sense data.
 426  * Returns:
 427  *  %NULL if no extended sense data has been stored or if no CIW of the
 428  *  specified command type could be found,
 429  *  else a pointer to the CIW of the specified command type.
 430  */
 431 struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
 432 {
 433         int ciw_cnt;
 434
 435         if (cdev->private->flags.esid == 0)
 436                 return NULL;
 437         for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
 438                 if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
 439                         return cdev->private->senseid.ciw + ciw_cnt;
 440         return NULL;
 441 }
 442
 443 /**
 444  * ccw_device_get_path_mask() - get currently available paths
 445  * @cdev: ccw device to be queried
 446  * Returns:
 447  *  %0 if no subchannel for the device is available,
 448  *  else the mask of currently available paths for the ccw device's subchannel.
 449  */
 450 __u8 ccw_device_get_path_mask(struct ccw_device *cdev)
 451 {
 452         struct subchannel *sch;
 453
 454         if (!cdev->dev.parent)
 455                 return 0;
 456
 457         sch = to_subchannel(cdev->dev.parent);
 458         return sch->lpm;
 459 }
 460
 461 /**
 462  * ccw_device_get_chp_desc() - return newly allocated channel-path descriptor
 463  * @cdev: device to obtain the descriptor for
 464  * @chp_idx: index of the channel path
 465  *
 466  * On success return a newly allocated copy of the channel-path description
 467  * data associated with the given channel path. Return %NULL on error.
 468  */
 469 struct channel_path_desc *ccw_device_get_chp_desc(struct ccw_device *cdev,
 470                                                   int chp_idx)
 471 {
 472         struct subchannel *sch;
 473         struct chp_id chpid;
 474
 475         sch = to_subchannel(cdev->dev.parent);
 476         chp_id_init(&chpid);
 477         chpid.id = sch->schib.pmcw.chpid[chp_idx];
 478         return chp_get_chp_desc(chpid);
 479 }
 480
 481 /**
 482  * ccw_device_get_id() - obtain a ccw device id
 483  * @cdev: device to obtain the id for
 484  * @dev_id: where to fill in the values
 485  */
 486 void ccw_device_get_id(struct ccw_device *cdev, struct ccw_dev_id *dev_id)
 487 {
 488         *dev_id = cdev->private->dev_id;
 489 }
 490 EXPORT_SYMBOL(ccw_device_get_id);
 491
 492 /**
 493  * ccw_device_tm_start_key() - perform start function
 494  * @cdev: ccw device on which to perform the start function
 495  * @tcw: transport-command word to be started
 496  * @intparm: user defined parameter to be passed to the interrupt handler
 497  * @lpm: mask of paths to use
 498  * @key: storage key to use for storage access
 499  *
 500  * Start the tcw on the given ccw device. Return zero on success, non-zero
 501  * otherwise.
 502  */
 503 int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
 504                             unsigned long intparm, u8 lpm, u8 key)
 505 {
 506         struct subchannel *sch;
 507         int rc;
 508
 509         sch = to_subchannel(cdev->dev.parent);
 510         if (!sch->schib.pmcw.ena)
 511                 return -EINVAL;
 512         if (cdev->private->state == DEV_STATE_VERIFY) {
 513                 /* Remember to fake irb when finished. */
 514                 if (!cdev->private->flags.fake_irb) {
 515                         cdev->private->flags.fake_irb = FAKE_TM_IRB;
 516                         cdev->private->intparm = intparm;
 517                         return 0;
 518                 } else
 519                         /* There's already a fake I/O around. */
 520                         return -EBUSY;
 521         }
 522         if (cdev->private->state != DEV_STATE_ONLINE)
 523                 return -EIO;
 524         /* Adjust requested path mask to exclude unusable paths. */
 525         if (lpm) {
 526                 lpm &= sch->lpm;
 527                 if (lpm == 0)
 528                         return -EACCES;
 529         }
 530         rc = cio_tm_start_key(sch, tcw, lpm, key);
 531         if (rc == 0)
 532                 cdev->private->intparm = intparm;
 533         return rc;
 534 }
 535 EXPORT_SYMBOL(ccw_device_tm_start_key);
 536
 537 /**
 538  * ccw_device_tm_start_timeout_key() - perform start function
 539  * @cdev: ccw device on which to perform the start function
 540  * @tcw: transport-command word to be started
 541  * @intparm: user defined parameter to be passed to the interrupt handler
 542  * @lpm: mask of paths to use
 543  * @key: storage key to use for storage access
 544  * @expires: time span in jiffies after which to abort request
 545  *
 546  * Start the tcw on the given ccw device. Return zero on success, non-zero
 547  * otherwise.
 548  */
 549 int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw,
 550                                     unsigned long intparm, u8 lpm, u8 key,
 551                                     int expires)
 552 {
 553         int ret;
 554
 555         ccw_device_set_timeout(cdev, expires);
 556         ret = ccw_device_tm_start_key(cdev, tcw, intparm, lpm, key);
 557         if (ret != 0)
 558                 ccw_device_set_timeout(cdev, 0);
 559         return ret;
 560 }
 561 EXPORT_SYMBOL(ccw_device_tm_start_timeout_key);
 562
 563 /**
 564  * ccw_device_tm_start() - perform start function
 565  * @cdev: ccw device on which to perform the start function
 566  * @tcw: transport-command word to be started
 567  * @intparm: user defined parameter to be passed to the interrupt handler
 568  * @lpm: mask of paths to use
 569  *
 570  * Start the tcw on the given ccw device. Return zero on success, non-zero
 571  * otherwise.
 572  */
 573 int ccw_device_tm_start(struct ccw_device *cdev, struct tcw *tcw,
 574                         unsigned long intparm, u8 lpm)
 575 {
 576         return ccw_device_tm_start_key(cdev, tcw, intparm, lpm,
 577                                        PAGE_DEFAULT_KEY);
 578 }
 579 EXPORT_SYMBOL(ccw_device_tm_start);
 580
 581 /**
 582  * ccw_device_tm_start_timeout() - perform start function
 583  * @cdev: ccw device on which to perform the start function
 584  * @tcw: transport-command word to be started
 585  * @intparm: user defined parameter to be passed to the interrupt handler
 586  * @lpm: mask of paths to use
 587  * @expires: time span in jiffies after which to abort request
 588  *
 589  * Start the tcw on the given ccw device. Return zero on success, non-zero
 590  * otherwise.
 591  */
 592 int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw,
 593                                unsigned long intparm, u8 lpm, int expires)
 594 {
 595         return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm,
 596                                                PAGE_DEFAULT_KEY, expires);
 597 }
 598 EXPORT_SYMBOL(ccw_device_tm_start_timeout);
 599
 600 /**
 601  * ccw_device_get_mdc() - accumulate max data count
 602  * @cdev: ccw device for which the max data count is accumulated
 603  * @mask: mask of paths to use
 604  *
 605  * Return the number of 64K-bytes blocks all paths at least support
 606  * for a transport command. Return values <= 0 indicate failures.
 607  */
 608 int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask)
 609 {
 610         struct subchannel *sch = to_subchannel(cdev->dev.parent);
 611         struct channel_path *chp;
 612         struct chp_id chpid;
 613         int mdc = 0, i;
 614
 615         /* Adjust requested path mask to excluded varied off paths. */
 616         if (mask)
 617                 mask &= sch->lpm;
 618         else
 619                 mask = sch->lpm;
 620
 621         chp_id_init(&chpid);
 622         for (i = 0; i < 8; i++) {
 623                 if (!(mask & (0x80 >> i)))
 624                         continue;
 625                 chpid.id = sch->schib.pmcw.chpid[i];
 626                 chp = chpid_to_chp(chpid);
 627                 if (!chp)
 628                         continue;
 629
 630                 mutex_lock(&chp->lock);
 631                 if (!chp->desc_fmt1.f) {
 632                         mutex_unlock(&chp->lock);
 633                         return 0;
 634                 }
 635                 if (!chp->desc_fmt1.r)
 636                         mdc = 1;
 637                 mdc = mdc ? min_t(int, mdc, chp->desc_fmt1.mdc) :
 638                             chp->desc_fmt1.mdc;
 639                 mutex_unlock(&chp->lock);
 640         }
 641
 642         return mdc;
 643 }
 644 EXPORT_SYMBOL(ccw_device_get_mdc);
 645
 646 /**
 647  * ccw_device_tm_intrg() - perform interrogate function
 648  * @cdev: ccw device on which to perform the interrogate function
 649  *
 650  * Perform an interrogate function on the given ccw device. Return zero on
 651  * success, non-zero otherwise.
 652  */
 653 int ccw_device_tm_intrg(struct ccw_device *cdev)
 654 {
 655         struct subchannel *sch = to_subchannel(cdev->dev.parent);
 656
 657         if (!sch->schib.pmcw.ena)
 658                 return -EINVAL;
 659         if (cdev->private->state != DEV_STATE_ONLINE)
 660                 return -EIO;
 661         if (!scsw_is_tm(&sch->schib.scsw) ||
 662             !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_START_PEND))
 663                 return -EINVAL;
 664         return cio_tm_intrg(sch);
 665 }
 666 EXPORT_SYMBOL(ccw_device_tm_intrg);
 667
 668 /**
 669  * ccw_device_get_schid() - obtain a subchannel id
 670  * @cdev: device to obtain the id for
 671  * @schid: where to fill in the values
 672  */
 673 void ccw_device_get_schid(struct ccw_device *cdev, struct subchannel_id *schid)
 674 {
 675         struct subchannel *sch = to_subchannel(cdev->dev.parent);
 676
 677         *schid = sch->schid;
 678 }
 679 EXPORT_SYMBOL_GPL(ccw_device_get_schid);
 680
 681 EXPORT_SYMBOL(ccw_device_set_options_mask);
 682 EXPORT_SYMBOL(ccw_device_set_options);
 683 EXPORT_SYMBOL(ccw_device_clear_options);
 684 EXPORT_SYMBOL(ccw_device_clear);
 685 EXPORT_SYMBOL(ccw_device_halt);
 686 EXPORT_SYMBOL(ccw_device_resume);
 687 EXPORT_SYMBOL(ccw_device_start_timeout);
 688 EXPORT_SYMBOL(ccw_device_start);
 689 EXPORT_SYMBOL(ccw_device_start_timeout_key);
 690 EXPORT_SYMBOL(ccw_device_start_key);
 691 EXPORT_SYMBOL(ccw_device_get_ciw);
 692 EXPORT_SYMBOL(ccw_device_get_path_mask);
 693 EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);