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 #include <linux/module.h> 8 #include <linux/init.h> 9 #include <linux/errno.h> 10 #include <linux/slab.h> 11 #include <linux/list.h> 12 #include <linux/device.h> 13 #include <linux/delay.h> 14 #include <linux/completion.h> 15 16 #include <asm/ccwdev.h> 17 #include <asm/idals.h> 18 #include <asm/chpid.h> 19 #include <asm/fcx.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 /** 29 * ccw_device_set_options_mask() - set some options and unset the rest 30 * @cdev: device for which the options are to be set 31 * @flags: options to be set 32 * 33 * All flags specified in @flags are set, all flags not specified in @flags 34 * are cleared. 35 * Returns: 36 * %0 on success, -%EINVAL on an invalid flag combination. 37 */ 38 int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags) 39 { 40 /* 41 * The flag usage is mutal exclusive ... 42 */ 43 if ((flags & CCWDEV_EARLY_NOTIFICATION) && 44 (flags & CCWDEV_REPORT_ALL)) 45 return -EINVAL; 46 cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0; 47 cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0; 48 cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0; 49 cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0; 50 cdev->private->options.mpath = (flags & CCWDEV_DO_MULTIPATH) != 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 cdev->private->options.mpath |= (flags & CCWDEV_DO_MULTIPATH) != 0; 80 return 0; 81 } 82 83 /** 84 * ccw_device_clear_options() - clear some options 85 * @cdev: device for which the options are to be cleared 86 * @flags: options to be cleared 87 * 88 * All flags specified in @flags are cleared, the remainder is left untouched. 89 */ 90 void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags) 91 { 92 cdev->private->options.fast &= (flags & CCWDEV_EARLY_NOTIFICATION) == 0; 93 cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0; 94 cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0; 95 cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0; 96 cdev->private->options.mpath &= (flags & CCWDEV_DO_MULTIPATH) == 0; 97 } 98 99 /** 100 * ccw_device_is_pathgroup() - determine if paths to this device are grouped 101 * @cdev: ccw device 102 * 103 * Return non-zero if there is a path group, zero otherwise. 104 */ 105 int ccw_device_is_pathgroup(struct ccw_device *cdev) 106 { 107 return cdev->private->flags.pgroup; 108 } 109 EXPORT_SYMBOL(ccw_device_is_pathgroup); 110 111 /** 112 * ccw_device_is_multipath() - determine if device is operating in multipath mode 113 * @cdev: ccw device 114 * 115 * Return non-zero if device is operating in multipath mode, zero otherwise. 116 */ 117 int ccw_device_is_multipath(struct ccw_device *cdev) 118 { 119 return cdev->private->flags.mpath; 120 } 121 EXPORT_SYMBOL(ccw_device_is_multipath); 122 123 /** 124 * ccw_device_clear() - terminate I/O request processing 125 * @cdev: target ccw device 126 * @intparm: interruption parameter; value is only used if no I/O is 127 * outstanding, otherwise the intparm associated with the I/O request 128 * is returned 129 * 130 * ccw_device_clear() calls csch on @cdev's subchannel. 131 * Returns: 132 * %0 on success, 133 * -%ENODEV on device not operational, 134 * -%EINVAL on invalid device state. 135 * Context: 136 * Interrupts disabled, ccw device lock held 137 */ 138 int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm) 139 { 140 struct subchannel *sch; 141 int ret; 142 143 if (!cdev || !cdev->dev.parent) 144 return -ENODEV; 145 sch = to_subchannel(cdev->dev.parent); 146 if (!sch->schib.pmcw.ena) 147 return -EINVAL; 148 if (cdev->private->state == DEV_STATE_NOT_OPER) 149 return -ENODEV; 150 if (cdev->private->state != DEV_STATE_ONLINE && 151 cdev->private->state != DEV_STATE_W4SENSE) 152 return -EINVAL; 153 154 ret = cio_clear(sch); 155 if (ret == 0) 156 cdev->private->intparm = intparm; 157 return ret; 158 } 159 160 /** 161 * ccw_device_start_key() - start a s390 channel program with key 162 * @cdev: target ccw device 163 * @cpa: logical start address of channel program 164 * @intparm: user specific interruption parameter; will be presented back to 165 * @cdev's interrupt handler. Allows a device driver to associate 166 * the interrupt with a particular I/O request. 167 * @lpm: defines the channel path to be used for a specific I/O request. A 168 * value of 0 will make cio use the opm. 169 * @key: storage key to be used for the I/O 170 * @flags: additional flags; defines the action to be performed for I/O 171 * processing. 172 * 173 * Start a S/390 channel program. When the interrupt arrives, the 174 * IRQ handler is called, either immediately, delayed (dev-end missing, 175 * or sense required) or never (no IRQ handler registered). 176 * Returns: 177 * %0, if the operation was successful; 178 * -%EBUSY, if the device is busy, or status pending; 179 * -%EACCES, if no path specified in @lpm is operational; 180 * -%ENODEV, if the device is not operational. 181 * Context: 182 * Interrupts disabled, ccw device lock held 183 */ 184 int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa, 185 unsigned long intparm, __u8 lpm, __u8 key, 186 unsigned long flags) 187 { 188 struct subchannel *sch; 189 int ret; 190 191 if (!cdev || !cdev->dev.parent) 192 return -ENODEV; 193 sch = to_subchannel(cdev->dev.parent); 194 if (!sch->schib.pmcw.ena) 195 return -EINVAL; 196 if (cdev->private->state == DEV_STATE_NOT_OPER) 197 return -ENODEV; 198 if (cdev->private->state == DEV_STATE_VERIFY) { 199 /* Remember to fake irb when finished. */ 200 if (!cdev->private->flags.fake_irb) { 201 cdev->private->flags.fake_irb = FAKE_CMD_IRB; 202 cdev->private->intparm = intparm; 203 return 0; 204 } else 205 /* There's already a fake I/O around. */ 206 return -EBUSY; 207 } 208 if (cdev->private->state != DEV_STATE_ONLINE || 209 ((sch->schib.scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) && 210 !(sch->schib.scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS)) || 211 cdev->private->flags.doverify) 212 return -EBUSY; 213 ret = cio_set_options (sch, flags); 214 if (ret) 215 return ret; 216 /* Adjust requested path mask to exclude unusable paths. */ 217 if (lpm) { 218 lpm &= sch->lpm; 219 if (lpm == 0) 220 return -EACCES; 221 } 222 ret = cio_start_key (sch, cpa, lpm, key); 223 switch (ret) { 224 case 0: 225 cdev->private->intparm = intparm; 226 break; 227 case -EACCES: 228 case -ENODEV: 229 dev_fsm_event(cdev, DEV_EVENT_VERIFY); 230 break; 231 } 232 return ret; 233 } 234 235 /** 236 * ccw_device_start_timeout_key() - start a s390 channel program with timeout and key 237 * @cdev: target ccw device 238 * @cpa: logical start address of channel program 239 * @intparm: user specific interruption parameter; will be presented back to 240 * @cdev's interrupt handler. Allows a device driver to associate 241 * the interrupt with a particular I/O request. 242 * @lpm: defines the channel path to be used for a specific I/O request. A 243 * value of 0 will make cio use the opm. 244 * @key: storage key to be used for the I/O 245 * @flags: additional flags; defines the action to be performed for I/O 246 * processing. 247 * @expires: timeout value in jiffies 248 * 249 * Start a S/390 channel program. When the interrupt arrives, the 250 * IRQ handler is called, either immediately, delayed (dev-end missing, 251 * or sense required) or never (no IRQ handler registered). 252 * This function notifies the device driver if the channel program has not 253 * completed during the time specified by @expires. If a timeout occurs, the 254 * channel program is terminated via xsch, hsch or csch, and the device's 255 * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT). 256 * Returns: 257 * %0, if the operation was successful; 258 * -%EBUSY, if the device is busy, or status pending; 259 * -%EACCES, if no path specified in @lpm is operational; 260 * -%ENODEV, if the device is not operational. 261 * Context: 262 * Interrupts disabled, ccw device lock held 263 */ 264 int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa, 265 unsigned long intparm, __u8 lpm, __u8 key, 266 unsigned long flags, int expires) 267 { 268 int ret; 269 270 if (!cdev) 271 return -ENODEV; 272 ccw_device_set_timeout(cdev, expires); 273 ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags); 274 if (ret != 0) 275 ccw_device_set_timeout(cdev, 0); 276 return ret; 277 } 278 279 /** 280 * ccw_device_start() - start a s390 channel program 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 * 291 * Start a S/390 channel program. When the interrupt arrives, the 292 * IRQ handler is called, either immediately, delayed (dev-end missing, 293 * or sense required) or never (no IRQ handler registered). 294 * Returns: 295 * %0, if the operation was successful; 296 * -%EBUSY, if the device is busy, or status pending; 297 * -%EACCES, if no path specified in @lpm is operational; 298 * -%ENODEV, if the device is not operational. 299 * Context: 300 * Interrupts disabled, ccw device lock held 301 */ 302 int ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa, 303 unsigned long intparm, __u8 lpm, unsigned long flags) 304 { 305 return ccw_device_start_key(cdev, cpa, intparm, lpm, 306 PAGE_DEFAULT_KEY, flags); 307 } 308 309 /** 310 * ccw_device_start_timeout() - start a s390 channel program with timeout 311 * @cdev: target ccw device 312 * @cpa: logical start address of channel program 313 * @intparm: user specific interruption parameter; will be presented back to 314 * @cdev's interrupt handler. Allows a device driver to associate 315 * the interrupt with a particular I/O request. 316 * @lpm: defines the channel path to be used for a specific I/O request. A 317 * value of 0 will make cio use the opm. 318 * @flags: additional flags; defines the action to be performed for I/O 319 * processing. 320 * @expires: timeout value in jiffies 321 * 322 * Start a S/390 channel program. When the interrupt arrives, the 323 * IRQ handler is called, either immediately, delayed (dev-end missing, 324 * or sense required) or never (no IRQ handler registered). 325 * This function notifies the device driver if the channel program has not 326 * completed during the time specified by @expires. If a timeout occurs, the 327 * channel program is terminated via xsch, hsch or csch, and the device's 328 * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT). 329 * Returns: 330 * %0, if the operation was successful; 331 * -%EBUSY, if the device is busy, or status pending; 332 * -%EACCES, if no path specified in @lpm is operational; 333 * -%ENODEV, if the device is not operational. 334 * Context: 335 * Interrupts disabled, ccw device lock held 336 */ 337 int ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa, 338 unsigned long intparm, __u8 lpm, 339 unsigned long flags, int expires) 340 { 341 return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm, 342 PAGE_DEFAULT_KEY, flags, 343 expires); 344 } 345 346 347 /** 348 * ccw_device_halt() - halt I/O request processing 349 * @cdev: target ccw device 350 * @intparm: interruption parameter; value is only used if no I/O is 351 * outstanding, otherwise the intparm associated with the I/O request 352 * is returned 353 * 354 * ccw_device_halt() calls hsch on @cdev's subchannel. 355 * Returns: 356 * %0 on success, 357 * -%ENODEV on device not operational, 358 * -%EINVAL on invalid device state, 359 * -%EBUSY on device busy or interrupt pending. 360 * Context: 361 * Interrupts disabled, ccw device lock held 362 */ 363 int ccw_device_halt(struct ccw_device *cdev, unsigned long intparm) 364 { 365 struct subchannel *sch; 366 int ret; 367 368 if (!cdev || !cdev->dev.parent) 369 return -ENODEV; 370 sch = to_subchannel(cdev->dev.parent); 371 if (!sch->schib.pmcw.ena) 372 return -EINVAL; 373 if (cdev->private->state == DEV_STATE_NOT_OPER) 374 return -ENODEV; 375 if (cdev->private->state != DEV_STATE_ONLINE && 376 cdev->private->state != DEV_STATE_W4SENSE) 377 return -EINVAL; 378 379 ret = cio_halt(sch); 380 if (ret == 0) 381 cdev->private->intparm = intparm; 382 return ret; 383 } 384 385 /** 386 * ccw_device_resume() - resume channel program execution 387 * @cdev: target ccw device 388 * 389 * ccw_device_resume() calls rsch on @cdev's subchannel. 390 * Returns: 391 * %0 on success, 392 * -%ENODEV on device not operational, 393 * -%EINVAL on invalid device state, 394 * -%EBUSY on device busy or interrupt pending. 395 * Context: 396 * Interrupts disabled, ccw device lock held 397 */ 398 int ccw_device_resume(struct ccw_device *cdev) 399 { 400 struct subchannel *sch; 401 402 if (!cdev || !cdev->dev.parent) 403 return -ENODEV; 404 sch = to_subchannel(cdev->dev.parent); 405 if (!sch->schib.pmcw.ena) 406 return -EINVAL; 407 if (cdev->private->state == DEV_STATE_NOT_OPER) 408 return -ENODEV; 409 if (cdev->private->state != DEV_STATE_ONLINE || 410 !(sch->schib.scsw.cmd.actl & SCSW_ACTL_SUSPENDED)) 411 return -EINVAL; 412 return cio_resume(sch); 413 } 414 415 /** 416 * ccw_device_get_ciw() - Search for CIW command in extended sense data. 417 * @cdev: ccw device to inspect 418 * @ct: command type to look for 419 * 420 * During SenseID, command information words (CIWs) describing special 421 * commands available to the device may have been stored in the extended 422 * sense data. This function searches for CIWs of a specified command 423 * type in the extended sense data. 424 * Returns: 425 * %NULL if no extended sense data has been stored or if no CIW of the 426 * specified command type could be found, 427 * else a pointer to the CIW of the specified command type. 428 */ 429 struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct) 430 { 431 int ciw_cnt; 432 433 if (cdev->private->flags.esid == 0) 434 return NULL; 435 for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++) 436 if (cdev->private->senseid.ciw[ciw_cnt].ct == ct) 437 return cdev->private->senseid.ciw + ciw_cnt; 438 return NULL; 439 } 440 441 /** 442 * ccw_device_get_path_mask() - get currently available paths 443 * @cdev: ccw device to be queried 444 * Returns: 445 * %0 if no subchannel for the device is available, 446 * else the mask of currently available paths for the ccw device's subchannel. 447 */ 448 __u8 ccw_device_get_path_mask(struct ccw_device *cdev) 449 { 450 struct subchannel *sch; 451 452 if (!cdev->dev.parent) 453 return 0; 454 455 sch = to_subchannel(cdev->dev.parent); 456 return sch->lpm; 457 } 458 459 /** 460 * ccw_device_get_chp_desc() - return newly allocated channel-path descriptor 461 * @cdev: device to obtain the descriptor for 462 * @chp_idx: index of the channel path 463 * 464 * On success return a newly allocated copy of the channel-path description 465 * data associated with the given channel path. Return %NULL on error. 466 */ 467 struct channel_path_desc *ccw_device_get_chp_desc(struct ccw_device *cdev, 468 int chp_idx) 469 { 470 struct subchannel *sch; 471 struct chp_id chpid; 472 473 sch = to_subchannel(cdev->dev.parent); 474 chp_id_init(&chpid); 475 chpid.id = sch->schib.pmcw.chpid[chp_idx]; 476 return chp_get_chp_desc(chpid); 477 } 478 479 /** 480 * ccw_device_get_id() - obtain a ccw device id 481 * @cdev: device to obtain the id for 482 * @dev_id: where to fill in the values 483 */ 484 void ccw_device_get_id(struct ccw_device *cdev, struct ccw_dev_id *dev_id) 485 { 486 *dev_id = cdev->private->dev_id; 487 } 488 EXPORT_SYMBOL(ccw_device_get_id); 489 490 /** 491 * ccw_device_tm_start_key() - perform start function 492 * @cdev: ccw device on which to perform the start function 493 * @tcw: transport-command word to be started 494 * @intparm: user defined parameter to be passed to the interrupt handler 495 * @lpm: mask of paths to use 496 * @key: storage key to use for storage access 497 * 498 * Start the tcw on the given ccw device. Return zero on success, non-zero 499 * otherwise. 500 */ 501 int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw, 502 unsigned long intparm, u8 lpm, u8 key) 503 { 504 struct subchannel *sch; 505 int rc; 506 507 sch = to_subchannel(cdev->dev.parent); 508 if (!sch->schib.pmcw.ena) 509 return -EINVAL; 510 if (cdev->private->state == DEV_STATE_VERIFY) { 511 /* Remember to fake irb when finished. */ 512 if (!cdev->private->flags.fake_irb) { 513 cdev->private->flags.fake_irb = FAKE_TM_IRB; 514 cdev->private->intparm = intparm; 515 return 0; 516 } else 517 /* There's already a fake I/O around. */ 518 return -EBUSY; 519 } 520 if (cdev->private->state != DEV_STATE_ONLINE) 521 return -EIO; 522 /* Adjust requested path mask to exclude unusable paths. */ 523 if (lpm) { 524 lpm &= sch->lpm; 525 if (lpm == 0) 526 return -EACCES; 527 } 528 rc = cio_tm_start_key(sch, tcw, lpm, key); 529 if (rc == 0) 530 cdev->private->intparm = intparm; 531 return rc; 532 } 533 EXPORT_SYMBOL(ccw_device_tm_start_key); 534 535 /** 536 * ccw_device_tm_start_timeout_key() - perform start function 537 * @cdev: ccw device on which to perform the start function 538 * @tcw: transport-command word to be started 539 * @intparm: user defined parameter to be passed to the interrupt handler 540 * @lpm: mask of paths to use 541 * @key: storage key to use for storage access 542 * @expires: time span in jiffies after which to abort request 543 * 544 * Start the tcw on the given ccw device. Return zero on success, non-zero 545 * otherwise. 546 */ 547 int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw, 548 unsigned long intparm, u8 lpm, u8 key, 549 int expires) 550 { 551 int ret; 552 553 ccw_device_set_timeout(cdev, expires); 554 ret = ccw_device_tm_start_key(cdev, tcw, intparm, lpm, key); 555 if (ret != 0) 556 ccw_device_set_timeout(cdev, 0); 557 return ret; 558 } 559 EXPORT_SYMBOL(ccw_device_tm_start_timeout_key); 560 561 /** 562 * ccw_device_tm_start() - perform start function 563 * @cdev: ccw device on which to perform the start function 564 * @tcw: transport-command word to be started 565 * @intparm: user defined parameter to be passed to the interrupt handler 566 * @lpm: mask of paths to use 567 * 568 * Start the tcw on the given ccw device. Return zero on success, non-zero 569 * otherwise. 570 */ 571 int ccw_device_tm_start(struct ccw_device *cdev, struct tcw *tcw, 572 unsigned long intparm, u8 lpm) 573 { 574 return ccw_device_tm_start_key(cdev, tcw, intparm, lpm, 575 PAGE_DEFAULT_KEY); 576 } 577 EXPORT_SYMBOL(ccw_device_tm_start); 578 579 /** 580 * ccw_device_tm_start_timeout() - perform start function 581 * @cdev: ccw device on which to perform the start function 582 * @tcw: transport-command word to be started 583 * @intparm: user defined parameter to be passed to the interrupt handler 584 * @lpm: mask of paths to use 585 * @expires: time span in jiffies after which to abort request 586 * 587 * Start the tcw on the given ccw device. Return zero on success, non-zero 588 * otherwise. 589 */ 590 int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw, 591 unsigned long intparm, u8 lpm, int expires) 592 { 593 return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm, 594 PAGE_DEFAULT_KEY, expires); 595 } 596 EXPORT_SYMBOL(ccw_device_tm_start_timeout); 597 598 /** 599 * ccw_device_get_mdc() - accumulate max data count 600 * @cdev: ccw device for which the max data count is accumulated 601 * @mask: mask of paths to use 602 * 603 * Return the number of 64K-bytes blocks all paths at least support 604 * for a transport command. Return values <= 0 indicate failures. 605 */ 606 int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask) 607 { 608 struct subchannel *sch = to_subchannel(cdev->dev.parent); 609 struct channel_path *chp; 610 struct chp_id chpid; 611 int mdc = 0, i; 612 613 /* Adjust requested path mask to excluded varied off paths. */ 614 if (mask) 615 mask &= sch->lpm; 616 else 617 mask = sch->lpm; 618 619 chp_id_init(&chpid); 620 for (i = 0; i < 8; i++) { 621 if (!(mask & (0x80 >> i))) 622 continue; 623 chpid.id = sch->schib.pmcw.chpid[i]; 624 chp = chpid_to_chp(chpid); 625 if (!chp) 626 continue; 627 628 mutex_lock(&chp->lock); 629 if (!chp->desc_fmt1.f) { 630 mutex_unlock(&chp->lock); 631 return 0; 632 } 633 if (!chp->desc_fmt1.r) 634 mdc = 1; 635 mdc = mdc ? min_t(int, mdc, chp->desc_fmt1.mdc) : 636 chp->desc_fmt1.mdc; 637 mutex_unlock(&chp->lock); 638 } 639 640 return mdc; 641 } 642 EXPORT_SYMBOL(ccw_device_get_mdc); 643 644 /** 645 * ccw_device_tm_intrg() - perform interrogate function 646 * @cdev: ccw device on which to perform the interrogate function 647 * 648 * Perform an interrogate function on the given ccw device. Return zero on 649 * success, non-zero otherwise. 650 */ 651 int ccw_device_tm_intrg(struct ccw_device *cdev) 652 { 653 struct subchannel *sch = to_subchannel(cdev->dev.parent); 654 655 if (!sch->schib.pmcw.ena) 656 return -EINVAL; 657 if (cdev->private->state != DEV_STATE_ONLINE) 658 return -EIO; 659 if (!scsw_is_tm(&sch->schib.scsw) || 660 !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_START_PEND)) 661 return -EINVAL; 662 return cio_tm_intrg(sch); 663 } 664 EXPORT_SYMBOL(ccw_device_tm_intrg); 665 666 /** 667 * ccw_device_get_schid() - obtain a subchannel id 668 * @cdev: device to obtain the id for 669 * @schid: where to fill in the values 670 */ 671 void ccw_device_get_schid(struct ccw_device *cdev, struct subchannel_id *schid) 672 { 673 struct subchannel *sch = to_subchannel(cdev->dev.parent); 674 675 *schid = sch->schid; 676 } 677 EXPORT_SYMBOL_GPL(ccw_device_get_schid); 678 679 MODULE_LICENSE("GPL"); 680 EXPORT_SYMBOL(ccw_device_set_options_mask); 681 EXPORT_SYMBOL(ccw_device_set_options); 682 EXPORT_SYMBOL(ccw_device_clear_options); 683 EXPORT_SYMBOL(ccw_device_clear); 684 EXPORT_SYMBOL(ccw_device_halt); 685 EXPORT_SYMBOL(ccw_device_resume); 686 EXPORT_SYMBOL(ccw_device_start_timeout); 687 EXPORT_SYMBOL(ccw_device_start); 688 EXPORT_SYMBOL(ccw_device_start_timeout_key); 689 EXPORT_SYMBOL(ccw_device_start_key); 690 EXPORT_SYMBOL(ccw_device_get_ciw); 691 EXPORT_SYMBOL(ccw_device_get_path_mask); 692 EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc); 693