1 /* 2 * drivers/s390/cio/device_fsm.c 3 * finite state machine for device handling 4 * 5 * Copyright IBM Corp. 2002,2008 6 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 */ 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/jiffies.h> 13 #include <linux/string.h> 14 15 #include <asm/ccwdev.h> 16 #include <asm/cio.h> 17 #include <asm/chpid.h> 18 19 #include "cio.h" 20 #include "cio_debug.h" 21 #include "css.h" 22 #include "device.h" 23 #include "chsc.h" 24 #include "ioasm.h" 25 #include "chp.h" 26 27 static int timeout_log_enabled; 28 29 static int __init ccw_timeout_log_setup(char *unused) 30 { 31 timeout_log_enabled = 1; 32 return 1; 33 } 34 35 __setup("ccw_timeout_log", ccw_timeout_log_setup); 36 37 static void ccw_timeout_log(struct ccw_device *cdev) 38 { 39 struct schib schib; 40 struct subchannel *sch; 41 struct io_subchannel_private *private; 42 union orb *orb; 43 int cc; 44 45 sch = to_subchannel(cdev->dev.parent); 46 private = to_io_private(sch); 47 orb = &private->orb; 48 cc = stsch_err(sch->schid, &schib); 49 50 printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, " 51 "device information:\n", get_clock()); 52 printk(KERN_WARNING "cio: orb:\n"); 53 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 54 orb, sizeof(*orb), 0); 55 printk(KERN_WARNING "cio: ccw device bus id: %s\n", 56 dev_name(&cdev->dev)); 57 printk(KERN_WARNING "cio: subchannel bus id: %s\n", 58 dev_name(&sch->dev)); 59 printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, " 60 "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm); 61 62 if (orb->tm.b) { 63 printk(KERN_WARNING "cio: orb indicates transport mode\n"); 64 printk(KERN_WARNING "cio: last tcw:\n"); 65 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 66 (void *)(addr_t)orb->tm.tcw, 67 sizeof(struct tcw), 0); 68 } else { 69 printk(KERN_WARNING "cio: orb indicates command mode\n"); 70 if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw || 71 (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws) 72 printk(KERN_WARNING "cio: last channel program " 73 "(intern):\n"); 74 else 75 printk(KERN_WARNING "cio: last channel program:\n"); 76 77 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 78 (void *)(addr_t)orb->cmd.cpa, 79 sizeof(struct ccw1), 0); 80 } 81 printk(KERN_WARNING "cio: ccw device state: %d\n", 82 cdev->private->state); 83 printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc); 84 printk(KERN_WARNING "cio: schib:\n"); 85 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 86 &schib, sizeof(schib), 0); 87 printk(KERN_WARNING "cio: ccw device flags:\n"); 88 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 89 &cdev->private->flags, sizeof(cdev->private->flags), 0); 90 } 91 92 /* 93 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. 94 */ 95 static void 96 ccw_device_timeout(unsigned long data) 97 { 98 struct ccw_device *cdev; 99 100 cdev = (struct ccw_device *) data; 101 spin_lock_irq(cdev->ccwlock); 102 if (timeout_log_enabled) 103 ccw_timeout_log(cdev); 104 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); 105 spin_unlock_irq(cdev->ccwlock); 106 } 107 108 /* 109 * Set timeout 110 */ 111 void 112 ccw_device_set_timeout(struct ccw_device *cdev, int expires) 113 { 114 if (expires == 0) { 115 del_timer(&cdev->private->timer); 116 return; 117 } 118 if (timer_pending(&cdev->private->timer)) { 119 if (mod_timer(&cdev->private->timer, jiffies + expires)) 120 return; 121 } 122 cdev->private->timer.function = ccw_device_timeout; 123 cdev->private->timer.data = (unsigned long) cdev; 124 cdev->private->timer.expires = jiffies + expires; 125 add_timer(&cdev->private->timer); 126 } 127 128 /* 129 * Cancel running i/o. This is called repeatedly since halt/clear are 130 * asynchronous operations. We do one try with cio_cancel, two tries 131 * with cio_halt, 255 tries with cio_clear. If everythings fails panic. 132 * Returns 0 if device now idle, -ENODEV for device not operational and 133 * -EBUSY if an interrupt is expected (either from halt/clear or from a 134 * status pending). 135 */ 136 int 137 ccw_device_cancel_halt_clear(struct ccw_device *cdev) 138 { 139 struct subchannel *sch; 140 int ret; 141 142 sch = to_subchannel(cdev->dev.parent); 143 if (cio_update_schib(sch)) 144 return -ENODEV; 145 if (!sch->schib.pmcw.ena) 146 /* Not operational -> done. */ 147 return 0; 148 /* Stage 1: cancel io. */ 149 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) && 150 !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { 151 if (!scsw_is_tm(&sch->schib.scsw)) { 152 ret = cio_cancel(sch); 153 if (ret != -EINVAL) 154 return ret; 155 } 156 /* cancel io unsuccessful or not applicable (transport mode). 157 * Continue with asynchronous instructions. */ 158 cdev->private->iretry = 3; /* 3 halt retries. */ 159 } 160 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { 161 /* Stage 2: halt io. */ 162 if (cdev->private->iretry) { 163 cdev->private->iretry--; 164 ret = cio_halt(sch); 165 if (ret != -EBUSY) 166 return (ret == 0) ? -EBUSY : ret; 167 } 168 /* halt io unsuccessful. */ 169 cdev->private->iretry = 255; /* 255 clear retries. */ 170 } 171 /* Stage 3: clear io. */ 172 if (cdev->private->iretry) { 173 cdev->private->iretry--; 174 ret = cio_clear (sch); 175 return (ret == 0) ? -EBUSY : ret; 176 } 177 panic("Can't stop i/o on subchannel.\n"); 178 } 179 180 void ccw_device_update_sense_data(struct ccw_device *cdev) 181 { 182 memset(&cdev->id, 0, sizeof(cdev->id)); 183 cdev->id.cu_type = cdev->private->senseid.cu_type; 184 cdev->id.cu_model = cdev->private->senseid.cu_model; 185 cdev->id.dev_type = cdev->private->senseid.dev_type; 186 cdev->id.dev_model = cdev->private->senseid.dev_model; 187 } 188 189 int ccw_device_test_sense_data(struct ccw_device *cdev) 190 { 191 return cdev->id.cu_type == cdev->private->senseid.cu_type && 192 cdev->id.cu_model == cdev->private->senseid.cu_model && 193 cdev->id.dev_type == cdev->private->senseid.dev_type && 194 cdev->id.dev_model == cdev->private->senseid.dev_model; 195 } 196 197 /* 198 * The machine won't give us any notification by machine check if a chpid has 199 * been varied online on the SE so we have to find out by magic (i. e. driving 200 * the channel subsystem to device selection and updating our path masks). 201 */ 202 static void 203 __recover_lost_chpids(struct subchannel *sch, int old_lpm) 204 { 205 int mask, i; 206 struct chp_id chpid; 207 208 chp_id_init(&chpid); 209 for (i = 0; i<8; i++) { 210 mask = 0x80 >> i; 211 if (!(sch->lpm & mask)) 212 continue; 213 if (old_lpm & mask) 214 continue; 215 chpid.id = sch->schib.pmcw.chpid[i]; 216 if (!chp_is_registered(chpid)) 217 css_schedule_eval_all(); 218 } 219 } 220 221 /* 222 * Stop device recognition. 223 */ 224 static void 225 ccw_device_recog_done(struct ccw_device *cdev, int state) 226 { 227 struct subchannel *sch; 228 int old_lpm; 229 230 sch = to_subchannel(cdev->dev.parent); 231 232 if (cio_disable_subchannel(sch)) 233 state = DEV_STATE_NOT_OPER; 234 /* 235 * Now that we tried recognition, we have performed device selection 236 * through ssch() and the path information is up to date. 237 */ 238 old_lpm = sch->lpm; 239 240 /* Check since device may again have become not operational. */ 241 if (cio_update_schib(sch)) 242 state = DEV_STATE_NOT_OPER; 243 else 244 sch->lpm = sch->schib.pmcw.pam & sch->opm; 245 246 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) 247 /* Force reprobe on all chpids. */ 248 old_lpm = 0; 249 if (sch->lpm != old_lpm) 250 __recover_lost_chpids(sch, old_lpm); 251 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID && 252 (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) { 253 cdev->private->flags.recog_done = 1; 254 cdev->private->state = DEV_STATE_DISCONNECTED; 255 wake_up(&cdev->private->wait_q); 256 return; 257 } 258 if (cdev->private->flags.resuming) { 259 cdev->private->state = state; 260 cdev->private->flags.recog_done = 1; 261 wake_up(&cdev->private->wait_q); 262 return; 263 } 264 switch (state) { 265 case DEV_STATE_NOT_OPER: 266 break; 267 case DEV_STATE_OFFLINE: 268 if (!cdev->online) { 269 ccw_device_update_sense_data(cdev); 270 break; 271 } 272 cdev->private->state = DEV_STATE_OFFLINE; 273 cdev->private->flags.recog_done = 1; 274 if (ccw_device_test_sense_data(cdev)) { 275 cdev->private->flags.donotify = 1; 276 ccw_device_online(cdev); 277 wake_up(&cdev->private->wait_q); 278 } else { 279 ccw_device_update_sense_data(cdev); 280 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); 281 } 282 return; 283 case DEV_STATE_BOXED: 284 if (cdev->id.cu_type != 0) { /* device was recognized before */ 285 cdev->private->flags.recog_done = 1; 286 cdev->private->state = DEV_STATE_BOXED; 287 wake_up(&cdev->private->wait_q); 288 return; 289 } 290 break; 291 } 292 cdev->private->state = state; 293 io_subchannel_recog_done(cdev); 294 wake_up(&cdev->private->wait_q); 295 } 296 297 /* 298 * Function called from device_id.c after sense id has completed. 299 */ 300 void 301 ccw_device_sense_id_done(struct ccw_device *cdev, int err) 302 { 303 switch (err) { 304 case 0: 305 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); 306 break; 307 case -ETIME: /* Sense id stopped by timeout. */ 308 ccw_device_recog_done(cdev, DEV_STATE_BOXED); 309 break; 310 default: 311 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); 312 break; 313 } 314 } 315 316 /** 317 * ccw_device_notify() - inform the device's driver about an event 318 * @cdev: device for which an event occured 319 * @event: event that occurred 320 * 321 * Returns: 322 * -%EINVAL if the device is offline or has no driver. 323 * -%EOPNOTSUPP if the device's driver has no notifier registered. 324 * %NOTIFY_OK if the driver wants to keep the device. 325 * %NOTIFY_BAD if the driver doesn't want to keep the device. 326 */ 327 int ccw_device_notify(struct ccw_device *cdev, int event) 328 { 329 int ret = -EINVAL; 330 331 if (!cdev->drv) 332 goto out; 333 if (!cdev->online) 334 goto out; 335 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", 336 cdev->private->dev_id.ssid, cdev->private->dev_id.devno, 337 event); 338 if (!cdev->drv->notify) { 339 ret = -EOPNOTSUPP; 340 goto out; 341 } 342 if (cdev->drv->notify(cdev, event)) 343 ret = NOTIFY_OK; 344 else 345 ret = NOTIFY_BAD; 346 out: 347 return ret; 348 } 349 350 static void ccw_device_oper_notify(struct ccw_device *cdev) 351 { 352 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) { 353 /* Reenable channel measurements, if needed. */ 354 ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF); 355 return; 356 } 357 /* Driver doesn't want device back. */ 358 ccw_device_set_notoper(cdev); 359 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); 360 } 361 362 /* 363 * Finished with online/offline processing. 364 */ 365 static void 366 ccw_device_done(struct ccw_device *cdev, int state) 367 { 368 struct subchannel *sch; 369 370 sch = to_subchannel(cdev->dev.parent); 371 372 ccw_device_set_timeout(cdev, 0); 373 374 if (state != DEV_STATE_ONLINE) 375 cio_disable_subchannel(sch); 376 377 /* Reset device status. */ 378 memset(&cdev->private->irb, 0, sizeof(struct irb)); 379 380 cdev->private->state = state; 381 382 switch (state) { 383 case DEV_STATE_BOXED: 384 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", 385 cdev->private->dev_id.devno, sch->schid.sch_no); 386 if (cdev->online && 387 ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK) 388 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 389 cdev->private->flags.donotify = 0; 390 break; 391 case DEV_STATE_NOT_OPER: 392 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n", 393 cdev->private->dev_id.devno, sch->schid.sch_no); 394 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) 395 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 396 else 397 ccw_device_set_disconnected(cdev); 398 cdev->private->flags.donotify = 0; 399 break; 400 case DEV_STATE_DISCONNECTED: 401 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel " 402 "%04x\n", cdev->private->dev_id.devno, 403 sch->schid.sch_no); 404 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) 405 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 406 else 407 ccw_device_set_disconnected(cdev); 408 cdev->private->flags.donotify = 0; 409 break; 410 default: 411 break; 412 } 413 414 if (cdev->private->flags.donotify) { 415 cdev->private->flags.donotify = 0; 416 ccw_device_oper_notify(cdev); 417 } 418 wake_up(&cdev->private->wait_q); 419 } 420 421 /* 422 * Start device recognition. 423 */ 424 void ccw_device_recognition(struct ccw_device *cdev) 425 { 426 struct subchannel *sch = to_subchannel(cdev->dev.parent); 427 428 /* 429 * We used to start here with a sense pgid to find out whether a device 430 * is locked by someone else. Unfortunately, the sense pgid command 431 * code has other meanings on devices predating the path grouping 432 * algorithm, so we start with sense id and box the device after an 433 * timeout (or if sense pgid during path verification detects the device 434 * is locked, as may happen on newer devices). 435 */ 436 cdev->private->flags.recog_done = 0; 437 cdev->private->state = DEV_STATE_SENSE_ID; 438 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) { 439 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); 440 return; 441 } 442 ccw_device_sense_id_start(cdev); 443 } 444 445 /* 446 * Handle events for states that use the ccw request infrastructure. 447 */ 448 static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e) 449 { 450 switch (e) { 451 case DEV_EVENT_NOTOPER: 452 ccw_request_notoper(cdev); 453 break; 454 case DEV_EVENT_INTERRUPT: 455 ccw_request_handler(cdev); 456 break; 457 case DEV_EVENT_TIMEOUT: 458 ccw_request_timeout(cdev); 459 break; 460 default: 461 break; 462 } 463 } 464 465 void 466 ccw_device_verify_done(struct ccw_device *cdev, int err) 467 { 468 struct subchannel *sch; 469 470 sch = to_subchannel(cdev->dev.parent); 471 /* Update schib - pom may have changed. */ 472 if (cio_update_schib(sch)) { 473 err = -ENODEV; 474 goto callback; 475 } 476 /* Update lpm with verified path mask. */ 477 sch->lpm = sch->vpm; 478 /* Repeat path verification? */ 479 if (cdev->private->flags.doverify) { 480 ccw_device_verify_start(cdev); 481 return; 482 } 483 callback: 484 switch (err) { 485 case 0: 486 ccw_device_done(cdev, DEV_STATE_ONLINE); 487 /* Deliver fake irb to device driver, if needed. */ 488 if (cdev->private->flags.fake_irb) { 489 memset(&cdev->private->irb, 0, sizeof(struct irb)); 490 cdev->private->irb.scsw.cmd.cc = 1; 491 cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC; 492 cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND; 493 cdev->private->irb.scsw.cmd.stctl = 494 SCSW_STCTL_STATUS_PEND; 495 cdev->private->flags.fake_irb = 0; 496 if (cdev->handler) 497 cdev->handler(cdev, cdev->private->intparm, 498 &cdev->private->irb); 499 memset(&cdev->private->irb, 0, sizeof(struct irb)); 500 } 501 break; 502 case -ETIME: 503 case -EUSERS: 504 /* Reset oper notify indication after verify error. */ 505 cdev->private->flags.donotify = 0; 506 ccw_device_done(cdev, DEV_STATE_BOXED); 507 break; 508 case -EACCES: 509 /* Reset oper notify indication after verify error. */ 510 cdev->private->flags.donotify = 0; 511 ccw_device_done(cdev, DEV_STATE_DISCONNECTED); 512 break; 513 default: 514 /* Reset oper notify indication after verify error. */ 515 cdev->private->flags.donotify = 0; 516 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 517 break; 518 } 519 } 520 521 /* 522 * Get device online. 523 */ 524 int 525 ccw_device_online(struct ccw_device *cdev) 526 { 527 struct subchannel *sch; 528 int ret; 529 530 if ((cdev->private->state != DEV_STATE_OFFLINE) && 531 (cdev->private->state != DEV_STATE_BOXED)) 532 return -EINVAL; 533 sch = to_subchannel(cdev->dev.parent); 534 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); 535 if (ret != 0) { 536 /* Couldn't enable the subchannel for i/o. Sick device. */ 537 if (ret == -ENODEV) 538 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 539 return ret; 540 } 541 /* Start initial path verification. */ 542 cdev->private->state = DEV_STATE_VERIFY; 543 ccw_device_verify_start(cdev); 544 return 0; 545 } 546 547 void 548 ccw_device_disband_done(struct ccw_device *cdev, int err) 549 { 550 switch (err) { 551 case 0: 552 ccw_device_done(cdev, DEV_STATE_OFFLINE); 553 break; 554 case -ETIME: 555 ccw_device_done(cdev, DEV_STATE_BOXED); 556 break; 557 default: 558 cdev->private->flags.donotify = 0; 559 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 560 break; 561 } 562 } 563 564 /* 565 * Shutdown device. 566 */ 567 int 568 ccw_device_offline(struct ccw_device *cdev) 569 { 570 struct subchannel *sch; 571 572 /* Allow ccw_device_offline while disconnected. */ 573 if (cdev->private->state == DEV_STATE_DISCONNECTED || 574 cdev->private->state == DEV_STATE_NOT_OPER) { 575 cdev->private->flags.donotify = 0; 576 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 577 return 0; 578 } 579 if (cdev->private->state == DEV_STATE_BOXED) { 580 ccw_device_done(cdev, DEV_STATE_BOXED); 581 return 0; 582 } 583 if (ccw_device_is_orphan(cdev)) { 584 ccw_device_done(cdev, DEV_STATE_OFFLINE); 585 return 0; 586 } 587 sch = to_subchannel(cdev->dev.parent); 588 if (cio_update_schib(sch)) 589 return -ENODEV; 590 if (scsw_actl(&sch->schib.scsw) != 0) 591 return -EBUSY; 592 if (cdev->private->state != DEV_STATE_ONLINE) 593 return -EINVAL; 594 /* Are we doing path grouping? */ 595 if (!cdev->private->flags.pgroup) { 596 /* No, set state offline immediately. */ 597 ccw_device_done(cdev, DEV_STATE_OFFLINE); 598 return 0; 599 } 600 /* Start Set Path Group commands. */ 601 cdev->private->state = DEV_STATE_DISBAND_PGID; 602 ccw_device_disband_start(cdev); 603 return 0; 604 } 605 606 /* 607 * Handle not operational event in non-special state. 608 */ 609 static void ccw_device_generic_notoper(struct ccw_device *cdev, 610 enum dev_event dev_event) 611 { 612 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) 613 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 614 else 615 ccw_device_set_disconnected(cdev); 616 } 617 618 /* 619 * Handle path verification event in offline state. 620 */ 621 static void ccw_device_offline_verify(struct ccw_device *cdev, 622 enum dev_event dev_event) 623 { 624 struct subchannel *sch = to_subchannel(cdev->dev.parent); 625 626 css_schedule_eval(sch->schid); 627 } 628 629 /* 630 * Handle path verification event. 631 */ 632 static void 633 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) 634 { 635 struct subchannel *sch; 636 637 if (cdev->private->state == DEV_STATE_W4SENSE) { 638 cdev->private->flags.doverify = 1; 639 return; 640 } 641 sch = to_subchannel(cdev->dev.parent); 642 /* 643 * Since we might not just be coming from an interrupt from the 644 * subchannel we have to update the schib. 645 */ 646 if (cio_update_schib(sch)) { 647 ccw_device_verify_done(cdev, -ENODEV); 648 return; 649 } 650 651 if (scsw_actl(&sch->schib.scsw) != 0 || 652 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || 653 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { 654 /* 655 * No final status yet or final status not yet delivered 656 * to the device driver. Can't do path verfication now, 657 * delay until final status was delivered. 658 */ 659 cdev->private->flags.doverify = 1; 660 return; 661 } 662 /* Device is idle, we can do the path verification. */ 663 cdev->private->state = DEV_STATE_VERIFY; 664 ccw_device_verify_start(cdev); 665 } 666 667 /* 668 * Handle path verification event in boxed state. 669 */ 670 static void ccw_device_boxed_verify(struct ccw_device *cdev, 671 enum dev_event dev_event) 672 { 673 struct subchannel *sch = to_subchannel(cdev->dev.parent); 674 675 if (cdev->online) { 676 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) 677 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 678 else 679 ccw_device_online_verify(cdev, dev_event); 680 } else 681 css_schedule_eval(sch->schid); 682 } 683 684 /* 685 * Got an interrupt for a normal io (state online). 686 */ 687 static void 688 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) 689 { 690 struct irb *irb; 691 int is_cmd; 692 693 irb = (struct irb *)&S390_lowcore.irb; 694 is_cmd = !scsw_is_tm(&irb->scsw); 695 /* Check for unsolicited interrupt. */ 696 if (!scsw_is_solicited(&irb->scsw)) { 697 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && 698 !irb->esw.esw0.erw.cons) { 699 /* Unit check but no sense data. Need basic sense. */ 700 if (ccw_device_do_sense(cdev, irb) != 0) 701 goto call_handler_unsol; 702 memcpy(&cdev->private->irb, irb, sizeof(struct irb)); 703 cdev->private->state = DEV_STATE_W4SENSE; 704 cdev->private->intparm = 0; 705 return; 706 } 707 call_handler_unsol: 708 if (cdev->handler) 709 cdev->handler (cdev, 0, irb); 710 if (cdev->private->flags.doverify) 711 ccw_device_online_verify(cdev, 0); 712 return; 713 } 714 /* Accumulate status and find out if a basic sense is needed. */ 715 ccw_device_accumulate_irb(cdev, irb); 716 if (is_cmd && cdev->private->flags.dosense) { 717 if (ccw_device_do_sense(cdev, irb) == 0) { 718 cdev->private->state = DEV_STATE_W4SENSE; 719 } 720 return; 721 } 722 /* Call the handler. */ 723 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 724 /* Start delayed path verification. */ 725 ccw_device_online_verify(cdev, 0); 726 } 727 728 /* 729 * Got an timeout in online state. 730 */ 731 static void 732 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) 733 { 734 int ret; 735 736 ccw_device_set_timeout(cdev, 0); 737 ret = ccw_device_cancel_halt_clear(cdev); 738 if (ret == -EBUSY) { 739 ccw_device_set_timeout(cdev, 3*HZ); 740 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 741 return; 742 } 743 if (ret == -ENODEV) 744 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 745 else if (cdev->handler) 746 cdev->handler(cdev, cdev->private->intparm, 747 ERR_PTR(-ETIMEDOUT)); 748 } 749 750 /* 751 * Got an interrupt for a basic sense. 752 */ 753 static void 754 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) 755 { 756 struct irb *irb; 757 758 irb = (struct irb *)&S390_lowcore.irb; 759 /* Check for unsolicited interrupt. */ 760 if (scsw_stctl(&irb->scsw) == 761 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { 762 if (scsw_cc(&irb->scsw) == 1) 763 /* Basic sense hasn't started. Try again. */ 764 ccw_device_do_sense(cdev, irb); 765 else { 766 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " 767 "interrupt during w4sense...\n", 768 cdev->private->dev_id.ssid, 769 cdev->private->dev_id.devno); 770 if (cdev->handler) 771 cdev->handler (cdev, 0, irb); 772 } 773 return; 774 } 775 /* 776 * Check if a halt or clear has been issued in the meanwhile. If yes, 777 * only deliver the halt/clear interrupt to the device driver as if it 778 * had killed the original request. 779 */ 780 if (scsw_fctl(&irb->scsw) & 781 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { 782 cdev->private->flags.dosense = 0; 783 memset(&cdev->private->irb, 0, sizeof(struct irb)); 784 ccw_device_accumulate_irb(cdev, irb); 785 goto call_handler; 786 } 787 /* Add basic sense info to irb. */ 788 ccw_device_accumulate_basic_sense(cdev, irb); 789 if (cdev->private->flags.dosense) { 790 /* Another basic sense is needed. */ 791 ccw_device_do_sense(cdev, irb); 792 return; 793 } 794 call_handler: 795 cdev->private->state = DEV_STATE_ONLINE; 796 /* In case sensing interfered with setting the device online */ 797 wake_up(&cdev->private->wait_q); 798 /* Call the handler. */ 799 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 800 /* Start delayed path verification. */ 801 ccw_device_online_verify(cdev, 0); 802 } 803 804 static void 805 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) 806 { 807 struct subchannel *sch; 808 809 sch = to_subchannel(cdev->dev.parent); 810 ccw_device_set_timeout(cdev, 0); 811 /* Start delayed path verification. */ 812 ccw_device_online_verify(cdev, 0); 813 /* OK, i/o is dead now. Call interrupt handler. */ 814 if (cdev->handler) 815 cdev->handler(cdev, cdev->private->intparm, 816 ERR_PTR(-EIO)); 817 } 818 819 static void 820 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) 821 { 822 int ret; 823 824 ret = ccw_device_cancel_halt_clear(cdev); 825 if (ret == -EBUSY) { 826 ccw_device_set_timeout(cdev, 3*HZ); 827 return; 828 } 829 /* Start delayed path verification. */ 830 ccw_device_online_verify(cdev, 0); 831 if (cdev->handler) 832 cdev->handler(cdev, cdev->private->intparm, 833 ERR_PTR(-EIO)); 834 } 835 836 void ccw_device_kill_io(struct ccw_device *cdev) 837 { 838 int ret; 839 840 ret = ccw_device_cancel_halt_clear(cdev); 841 if (ret == -EBUSY) { 842 ccw_device_set_timeout(cdev, 3*HZ); 843 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 844 return; 845 } 846 /* Start delayed path verification. */ 847 ccw_device_online_verify(cdev, 0); 848 if (cdev->handler) 849 cdev->handler(cdev, cdev->private->intparm, 850 ERR_PTR(-EIO)); 851 } 852 853 static void 854 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) 855 { 856 /* Start verification after current task finished. */ 857 cdev->private->flags.doverify = 1; 858 } 859 860 static void 861 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) 862 { 863 struct subchannel *sch; 864 865 sch = to_subchannel(cdev->dev.parent); 866 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) 867 /* Couldn't enable the subchannel for i/o. Sick device. */ 868 return; 869 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; 870 ccw_device_sense_id_start(cdev); 871 } 872 873 void ccw_device_trigger_reprobe(struct ccw_device *cdev) 874 { 875 struct subchannel *sch; 876 877 if (cdev->private->state != DEV_STATE_DISCONNECTED) 878 return; 879 880 sch = to_subchannel(cdev->dev.parent); 881 /* Update some values. */ 882 if (cio_update_schib(sch)) 883 return; 884 /* 885 * The pim, pam, pom values may not be accurate, but they are the best 886 * we have before performing device selection :/ 887 */ 888 sch->lpm = sch->schib.pmcw.pam & sch->opm; 889 /* 890 * Use the initial configuration since we can't be shure that the old 891 * paths are valid. 892 */ 893 io_subchannel_init_config(sch); 894 if (cio_commit_config(sch)) 895 return; 896 897 /* We should also udate ssd info, but this has to wait. */ 898 /* Check if this is another device which appeared on the same sch. */ 899 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) 900 css_schedule_eval(sch->schid); 901 else 902 ccw_device_start_id(cdev, 0); 903 } 904 905 static void ccw_device_disabled_irq(struct ccw_device *cdev, 906 enum dev_event dev_event) 907 { 908 struct subchannel *sch; 909 910 sch = to_subchannel(cdev->dev.parent); 911 /* 912 * An interrupt in a disabled state means a previous disable was not 913 * successful - should not happen, but we try to disable again. 914 */ 915 cio_disable_subchannel(sch); 916 } 917 918 static void 919 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) 920 { 921 retry_set_schib(cdev); 922 cdev->private->state = DEV_STATE_ONLINE; 923 dev_fsm_event(cdev, dev_event); 924 } 925 926 static void ccw_device_update_cmfblock(struct ccw_device *cdev, 927 enum dev_event dev_event) 928 { 929 cmf_retry_copy_block(cdev); 930 cdev->private->state = DEV_STATE_ONLINE; 931 dev_fsm_event(cdev, dev_event); 932 } 933 934 static void 935 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) 936 { 937 ccw_device_set_timeout(cdev, 0); 938 cdev->private->state = DEV_STATE_NOT_OPER; 939 wake_up(&cdev->private->wait_q); 940 } 941 942 static void 943 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) 944 { 945 int ret; 946 947 ret = ccw_device_cancel_halt_clear(cdev); 948 if (ret == -EBUSY) { 949 ccw_device_set_timeout(cdev, HZ/10); 950 } else { 951 cdev->private->state = DEV_STATE_NOT_OPER; 952 wake_up(&cdev->private->wait_q); 953 } 954 } 955 956 /* 957 * No operation action. This is used e.g. to ignore a timeout event in 958 * state offline. 959 */ 960 static void 961 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) 962 { 963 } 964 965 /* 966 * device statemachine 967 */ 968 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { 969 [DEV_STATE_NOT_OPER] = { 970 [DEV_EVENT_NOTOPER] = ccw_device_nop, 971 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 972 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 973 [DEV_EVENT_VERIFY] = ccw_device_nop, 974 }, 975 [DEV_STATE_SENSE_PGID] = { 976 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 977 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 978 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 979 [DEV_EVENT_VERIFY] = ccw_device_nop, 980 }, 981 [DEV_STATE_SENSE_ID] = { 982 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 983 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 984 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 985 [DEV_EVENT_VERIFY] = ccw_device_nop, 986 }, 987 [DEV_STATE_OFFLINE] = { 988 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 989 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 990 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 991 [DEV_EVENT_VERIFY] = ccw_device_offline_verify, 992 }, 993 [DEV_STATE_VERIFY] = { 994 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 995 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 996 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 997 [DEV_EVENT_VERIFY] = ccw_device_delay_verify, 998 }, 999 [DEV_STATE_ONLINE] = { 1000 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1001 [DEV_EVENT_INTERRUPT] = ccw_device_irq, 1002 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, 1003 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1004 }, 1005 [DEV_STATE_W4SENSE] = { 1006 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1007 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, 1008 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1009 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1010 }, 1011 [DEV_STATE_DISBAND_PGID] = { 1012 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1013 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1014 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1015 [DEV_EVENT_VERIFY] = ccw_device_nop, 1016 }, 1017 [DEV_STATE_BOXED] = { 1018 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1019 [DEV_EVENT_INTERRUPT] = ccw_device_nop, 1020 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1021 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify, 1022 }, 1023 /* states to wait for i/o completion before doing something */ 1024 [DEV_STATE_TIMEOUT_KILL] = { 1025 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1026 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, 1027 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, 1028 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME 1029 }, 1030 [DEV_STATE_QUIESCE] = { 1031 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, 1032 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, 1033 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, 1034 [DEV_EVENT_VERIFY] = ccw_device_nop, 1035 }, 1036 /* special states for devices gone not operational */ 1037 [DEV_STATE_DISCONNECTED] = { 1038 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1039 [DEV_EVENT_INTERRUPT] = ccw_device_start_id, 1040 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1041 [DEV_EVENT_VERIFY] = ccw_device_start_id, 1042 }, 1043 [DEV_STATE_DISCONNECTED_SENSE_ID] = { 1044 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1045 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1046 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1047 [DEV_EVENT_VERIFY] = ccw_device_nop, 1048 }, 1049 [DEV_STATE_CMFCHANGE] = { 1050 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, 1051 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, 1052 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, 1053 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, 1054 }, 1055 [DEV_STATE_CMFUPDATE] = { 1056 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, 1057 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, 1058 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, 1059 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, 1060 }, 1061 [DEV_STATE_STEAL_LOCK] = { 1062 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1063 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1064 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1065 [DEV_EVENT_VERIFY] = ccw_device_nop, 1066 }, 1067 }; 1068 1069 EXPORT_SYMBOL_GPL(ccw_device_set_timeout); 1070