1 /* 2 * finite state machine for device handling 3 * 4 * Copyright IBM Corp. 2002, 2008 5 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) 6 * Martin Schwidefsky (schwidefsky@de.ibm.com) 7 */ 8 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/jiffies.h> 12 #include <linux/string.h> 13 14 #include <asm/ccwdev.h> 15 #include <asm/cio.h> 16 #include <asm/chpid.h> 17 18 #include "cio.h" 19 #include "cio_debug.h" 20 #include "css.h" 21 #include "device.h" 22 #include "chsc.h" 23 #include "ioasm.h" 24 #include "chp.h" 25 26 static int timeout_log_enabled; 27 28 static int __init ccw_timeout_log_setup(char *unused) 29 { 30 timeout_log_enabled = 1; 31 return 1; 32 } 33 34 __setup("ccw_timeout_log", ccw_timeout_log_setup); 35 36 static void ccw_timeout_log(struct ccw_device *cdev) 37 { 38 struct schib schib; 39 struct subchannel *sch; 40 struct io_subchannel_private *private; 41 union orb *orb; 42 int cc; 43 44 sch = to_subchannel(cdev->dev.parent); 45 private = to_io_private(sch); 46 orb = &private->orb; 47 cc = stsch(sch->schid, &schib); 48 49 printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, " 50 "device information:\n", get_tod_clock()); 51 printk(KERN_WARNING "cio: orb:\n"); 52 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 53 orb, sizeof(*orb), 0); 54 printk(KERN_WARNING "cio: ccw device bus id: %s\n", 55 dev_name(&cdev->dev)); 56 printk(KERN_WARNING "cio: subchannel bus id: %s\n", 57 dev_name(&sch->dev)); 58 printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, " 59 "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm); 60 61 if (orb->tm.b) { 62 printk(KERN_WARNING "cio: orb indicates transport mode\n"); 63 printk(KERN_WARNING "cio: last tcw:\n"); 64 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 65 (void *)(addr_t)orb->tm.tcw, 66 sizeof(struct tcw), 0); 67 } else { 68 printk(KERN_WARNING "cio: orb indicates command mode\n"); 69 if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw || 70 (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws) 71 printk(KERN_WARNING "cio: last channel program " 72 "(intern):\n"); 73 else 74 printk(KERN_WARNING "cio: last channel program:\n"); 75 76 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 77 (void *)(addr_t)orb->cmd.cpa, 78 sizeof(struct ccw1), 0); 79 } 80 printk(KERN_WARNING "cio: ccw device state: %d\n", 81 cdev->private->state); 82 printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc); 83 printk(KERN_WARNING "cio: schib:\n"); 84 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 85 &schib, sizeof(schib), 0); 86 printk(KERN_WARNING "cio: ccw device flags:\n"); 87 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 88 &cdev->private->flags, sizeof(cdev->private->flags), 0); 89 } 90 91 /* 92 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. 93 */ 94 void 95 ccw_device_timeout(struct timer_list *t) 96 { 97 struct ccw_device_private *priv = from_timer(priv, t, timer); 98 struct ccw_device *cdev = priv->cdev; 99 100 spin_lock_irq(cdev->ccwlock); 101 if (timeout_log_enabled) 102 ccw_timeout_log(cdev); 103 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); 104 spin_unlock_irq(cdev->ccwlock); 105 } 106 107 /* 108 * Set timeout 109 */ 110 void 111 ccw_device_set_timeout(struct ccw_device *cdev, int expires) 112 { 113 if (expires == 0) { 114 del_timer(&cdev->private->timer); 115 return; 116 } 117 if (timer_pending(&cdev->private->timer)) { 118 if (mod_timer(&cdev->private->timer, jiffies + expires)) 119 return; 120 } 121 cdev->private->timer.expires = jiffies + expires; 122 add_timer(&cdev->private->timer); 123 } 124 125 int 126 ccw_device_cancel_halt_clear(struct ccw_device *cdev) 127 { 128 struct subchannel *sch; 129 int ret; 130 131 sch = to_subchannel(cdev->dev.parent); 132 ret = cio_cancel_halt_clear(sch, &cdev->private->iretry); 133 134 if (ret == -EIO) 135 CIO_MSG_EVENT(0, "0.%x.%04x: could not stop I/O\n", 136 cdev->private->dev_id.ssid, 137 cdev->private->dev_id.devno); 138 139 return ret; 140 } 141 142 void ccw_device_update_sense_data(struct ccw_device *cdev) 143 { 144 memset(&cdev->id, 0, sizeof(cdev->id)); 145 cdev->id.cu_type = cdev->private->senseid.cu_type; 146 cdev->id.cu_model = cdev->private->senseid.cu_model; 147 cdev->id.dev_type = cdev->private->senseid.dev_type; 148 cdev->id.dev_model = cdev->private->senseid.dev_model; 149 } 150 151 int ccw_device_test_sense_data(struct ccw_device *cdev) 152 { 153 return cdev->id.cu_type == cdev->private->senseid.cu_type && 154 cdev->id.cu_model == cdev->private->senseid.cu_model && 155 cdev->id.dev_type == cdev->private->senseid.dev_type && 156 cdev->id.dev_model == cdev->private->senseid.dev_model; 157 } 158 159 /* 160 * The machine won't give us any notification by machine check if a chpid has 161 * been varied online on the SE so we have to find out by magic (i. e. driving 162 * the channel subsystem to device selection and updating our path masks). 163 */ 164 static void 165 __recover_lost_chpids(struct subchannel *sch, int old_lpm) 166 { 167 int mask, i; 168 struct chp_id chpid; 169 170 chp_id_init(&chpid); 171 for (i = 0; i<8; i++) { 172 mask = 0x80 >> i; 173 if (!(sch->lpm & mask)) 174 continue; 175 if (old_lpm & mask) 176 continue; 177 chpid.id = sch->schib.pmcw.chpid[i]; 178 if (!chp_is_registered(chpid)) 179 css_schedule_eval_all(); 180 } 181 } 182 183 /* 184 * Stop device recognition. 185 */ 186 static void 187 ccw_device_recog_done(struct ccw_device *cdev, int state) 188 { 189 struct subchannel *sch; 190 int old_lpm; 191 192 sch = to_subchannel(cdev->dev.parent); 193 194 if (cio_disable_subchannel(sch)) 195 state = DEV_STATE_NOT_OPER; 196 /* 197 * Now that we tried recognition, we have performed device selection 198 * through ssch() and the path information is up to date. 199 */ 200 old_lpm = sch->lpm; 201 202 /* Check since device may again have become not operational. */ 203 if (cio_update_schib(sch)) 204 state = DEV_STATE_NOT_OPER; 205 else 206 sch->lpm = sch->schib.pmcw.pam & sch->opm; 207 208 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) 209 /* Force reprobe on all chpids. */ 210 old_lpm = 0; 211 if (sch->lpm != old_lpm) 212 __recover_lost_chpids(sch, old_lpm); 213 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID && 214 (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) { 215 cdev->private->flags.recog_done = 1; 216 cdev->private->state = DEV_STATE_DISCONNECTED; 217 wake_up(&cdev->private->wait_q); 218 return; 219 } 220 if (cdev->private->flags.resuming) { 221 cdev->private->state = state; 222 cdev->private->flags.recog_done = 1; 223 wake_up(&cdev->private->wait_q); 224 return; 225 } 226 switch (state) { 227 case DEV_STATE_NOT_OPER: 228 break; 229 case DEV_STATE_OFFLINE: 230 if (!cdev->online) { 231 ccw_device_update_sense_data(cdev); 232 break; 233 } 234 cdev->private->state = DEV_STATE_OFFLINE; 235 cdev->private->flags.recog_done = 1; 236 if (ccw_device_test_sense_data(cdev)) { 237 cdev->private->flags.donotify = 1; 238 ccw_device_online(cdev); 239 wake_up(&cdev->private->wait_q); 240 } else { 241 ccw_device_update_sense_data(cdev); 242 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); 243 } 244 return; 245 case DEV_STATE_BOXED: 246 if (cdev->id.cu_type != 0) { /* device was recognized before */ 247 cdev->private->flags.recog_done = 1; 248 cdev->private->state = DEV_STATE_BOXED; 249 wake_up(&cdev->private->wait_q); 250 return; 251 } 252 break; 253 } 254 cdev->private->state = state; 255 io_subchannel_recog_done(cdev); 256 wake_up(&cdev->private->wait_q); 257 } 258 259 /* 260 * Function called from device_id.c after sense id has completed. 261 */ 262 void 263 ccw_device_sense_id_done(struct ccw_device *cdev, int err) 264 { 265 switch (err) { 266 case 0: 267 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); 268 break; 269 case -ETIME: /* Sense id stopped by timeout. */ 270 ccw_device_recog_done(cdev, DEV_STATE_BOXED); 271 break; 272 default: 273 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); 274 break; 275 } 276 } 277 278 /** 279 * ccw_device_notify() - inform the device's driver about an event 280 * @cdev: device for which an event occurred 281 * @event: event that occurred 282 * 283 * Returns: 284 * -%EINVAL if the device is offline or has no driver. 285 * -%EOPNOTSUPP if the device's driver has no notifier registered. 286 * %NOTIFY_OK if the driver wants to keep the device. 287 * %NOTIFY_BAD if the driver doesn't want to keep the device. 288 */ 289 int ccw_device_notify(struct ccw_device *cdev, int event) 290 { 291 int ret = -EINVAL; 292 293 if (!cdev->drv) 294 goto out; 295 if (!cdev->online) 296 goto out; 297 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", 298 cdev->private->dev_id.ssid, cdev->private->dev_id.devno, 299 event); 300 if (!cdev->drv->notify) { 301 ret = -EOPNOTSUPP; 302 goto out; 303 } 304 if (cdev->drv->notify(cdev, event)) 305 ret = NOTIFY_OK; 306 else 307 ret = NOTIFY_BAD; 308 out: 309 return ret; 310 } 311 312 static void ccw_device_oper_notify(struct ccw_device *cdev) 313 { 314 struct subchannel *sch = to_subchannel(cdev->dev.parent); 315 316 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) { 317 /* Reenable channel measurements, if needed. */ 318 ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF); 319 /* Save indication for new paths. */ 320 cdev->private->path_new_mask = sch->vpm; 321 return; 322 } 323 /* Driver doesn't want device back. */ 324 ccw_device_set_notoper(cdev); 325 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); 326 } 327 328 /* 329 * Finished with online/offline processing. 330 */ 331 static void 332 ccw_device_done(struct ccw_device *cdev, int state) 333 { 334 struct subchannel *sch; 335 336 sch = to_subchannel(cdev->dev.parent); 337 338 ccw_device_set_timeout(cdev, 0); 339 340 if (state != DEV_STATE_ONLINE) 341 cio_disable_subchannel(sch); 342 343 /* Reset device status. */ 344 memset(&cdev->private->irb, 0, sizeof(struct irb)); 345 346 cdev->private->state = state; 347 348 switch (state) { 349 case DEV_STATE_BOXED: 350 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", 351 cdev->private->dev_id.devno, sch->schid.sch_no); 352 if (cdev->online && 353 ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK) 354 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 355 cdev->private->flags.donotify = 0; 356 break; 357 case DEV_STATE_NOT_OPER: 358 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n", 359 cdev->private->dev_id.devno, sch->schid.sch_no); 360 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) 361 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 362 else 363 ccw_device_set_disconnected(cdev); 364 cdev->private->flags.donotify = 0; 365 break; 366 case DEV_STATE_DISCONNECTED: 367 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel " 368 "%04x\n", cdev->private->dev_id.devno, 369 sch->schid.sch_no); 370 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) { 371 cdev->private->state = DEV_STATE_NOT_OPER; 372 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 373 } else 374 ccw_device_set_disconnected(cdev); 375 cdev->private->flags.donotify = 0; 376 break; 377 default: 378 break; 379 } 380 381 if (cdev->private->flags.donotify) { 382 cdev->private->flags.donotify = 0; 383 ccw_device_oper_notify(cdev); 384 } 385 wake_up(&cdev->private->wait_q); 386 } 387 388 /* 389 * Start device recognition. 390 */ 391 void ccw_device_recognition(struct ccw_device *cdev) 392 { 393 struct subchannel *sch = to_subchannel(cdev->dev.parent); 394 395 /* 396 * We used to start here with a sense pgid to find out whether a device 397 * is locked by someone else. Unfortunately, the sense pgid command 398 * code has other meanings on devices predating the path grouping 399 * algorithm, so we start with sense id and box the device after an 400 * timeout (or if sense pgid during path verification detects the device 401 * is locked, as may happen on newer devices). 402 */ 403 cdev->private->flags.recog_done = 0; 404 cdev->private->state = DEV_STATE_SENSE_ID; 405 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) { 406 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); 407 return; 408 } 409 ccw_device_sense_id_start(cdev); 410 } 411 412 /* 413 * Handle events for states that use the ccw request infrastructure. 414 */ 415 static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e) 416 { 417 switch (e) { 418 case DEV_EVENT_NOTOPER: 419 ccw_request_notoper(cdev); 420 break; 421 case DEV_EVENT_INTERRUPT: 422 ccw_request_handler(cdev); 423 break; 424 case DEV_EVENT_TIMEOUT: 425 ccw_request_timeout(cdev); 426 break; 427 default: 428 break; 429 } 430 } 431 432 static void ccw_device_report_path_events(struct ccw_device *cdev) 433 { 434 struct subchannel *sch = to_subchannel(cdev->dev.parent); 435 int path_event[8]; 436 int chp, mask; 437 438 for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) { 439 path_event[chp] = PE_NONE; 440 if (mask & cdev->private->path_gone_mask & ~(sch->vpm)) 441 path_event[chp] |= PE_PATH_GONE; 442 if (mask & cdev->private->path_new_mask & sch->vpm) 443 path_event[chp] |= PE_PATH_AVAILABLE; 444 if (mask & cdev->private->pgid_reset_mask & sch->vpm) 445 path_event[chp] |= PE_PATHGROUP_ESTABLISHED; 446 } 447 if (cdev->online && cdev->drv->path_event) 448 cdev->drv->path_event(cdev, path_event); 449 } 450 451 static void ccw_device_reset_path_events(struct ccw_device *cdev) 452 { 453 cdev->private->path_gone_mask = 0; 454 cdev->private->path_new_mask = 0; 455 cdev->private->pgid_reset_mask = 0; 456 } 457 458 static void create_fake_irb(struct irb *irb, int type) 459 { 460 memset(irb, 0, sizeof(*irb)); 461 if (type == FAKE_CMD_IRB) { 462 struct cmd_scsw *scsw = &irb->scsw.cmd; 463 scsw->cc = 1; 464 scsw->fctl = SCSW_FCTL_START_FUNC; 465 scsw->actl = SCSW_ACTL_START_PEND; 466 scsw->stctl = SCSW_STCTL_STATUS_PEND; 467 } else if (type == FAKE_TM_IRB) { 468 struct tm_scsw *scsw = &irb->scsw.tm; 469 scsw->x = 1; 470 scsw->cc = 1; 471 scsw->fctl = SCSW_FCTL_START_FUNC; 472 scsw->actl = SCSW_ACTL_START_PEND; 473 scsw->stctl = SCSW_STCTL_STATUS_PEND; 474 } 475 } 476 477 static void ccw_device_handle_broken_paths(struct ccw_device *cdev) 478 { 479 struct subchannel *sch = to_subchannel(cdev->dev.parent); 480 u8 broken_paths = (sch->schib.pmcw.pam & sch->opm) ^ sch->vpm; 481 482 if (broken_paths && (cdev->private->path_broken_mask != broken_paths)) 483 ccw_device_schedule_recovery(); 484 485 cdev->private->path_broken_mask = broken_paths; 486 } 487 488 void ccw_device_verify_done(struct ccw_device *cdev, int err) 489 { 490 struct subchannel *sch; 491 492 sch = to_subchannel(cdev->dev.parent); 493 /* Update schib - pom may have changed. */ 494 if (cio_update_schib(sch)) { 495 err = -ENODEV; 496 goto callback; 497 } 498 /* Update lpm with verified path mask. */ 499 sch->lpm = sch->vpm; 500 /* Repeat path verification? */ 501 if (cdev->private->flags.doverify) { 502 ccw_device_verify_start(cdev); 503 return; 504 } 505 callback: 506 switch (err) { 507 case 0: 508 ccw_device_done(cdev, DEV_STATE_ONLINE); 509 /* Deliver fake irb to device driver, if needed. */ 510 if (cdev->private->flags.fake_irb) { 511 create_fake_irb(&cdev->private->irb, 512 cdev->private->flags.fake_irb); 513 cdev->private->flags.fake_irb = 0; 514 if (cdev->handler) 515 cdev->handler(cdev, cdev->private->intparm, 516 &cdev->private->irb); 517 memset(&cdev->private->irb, 0, sizeof(struct irb)); 518 } 519 ccw_device_report_path_events(cdev); 520 ccw_device_handle_broken_paths(cdev); 521 break; 522 case -ETIME: 523 case -EUSERS: 524 /* Reset oper notify indication after verify error. */ 525 cdev->private->flags.donotify = 0; 526 ccw_device_done(cdev, DEV_STATE_BOXED); 527 break; 528 case -EACCES: 529 /* Reset oper notify indication after verify error. */ 530 cdev->private->flags.donotify = 0; 531 ccw_device_done(cdev, DEV_STATE_DISCONNECTED); 532 break; 533 default: 534 /* Reset oper notify indication after verify error. */ 535 cdev->private->flags.donotify = 0; 536 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 537 break; 538 } 539 ccw_device_reset_path_events(cdev); 540 } 541 542 /* 543 * Get device online. 544 */ 545 int 546 ccw_device_online(struct ccw_device *cdev) 547 { 548 struct subchannel *sch; 549 int ret; 550 551 if ((cdev->private->state != DEV_STATE_OFFLINE) && 552 (cdev->private->state != DEV_STATE_BOXED)) 553 return -EINVAL; 554 sch = to_subchannel(cdev->dev.parent); 555 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); 556 if (ret != 0) { 557 /* Couldn't enable the subchannel for i/o. Sick device. */ 558 if (ret == -ENODEV) 559 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 560 return ret; 561 } 562 /* Start initial path verification. */ 563 cdev->private->state = DEV_STATE_VERIFY; 564 ccw_device_verify_start(cdev); 565 return 0; 566 } 567 568 void 569 ccw_device_disband_done(struct ccw_device *cdev, int err) 570 { 571 switch (err) { 572 case 0: 573 ccw_device_done(cdev, DEV_STATE_OFFLINE); 574 break; 575 case -ETIME: 576 ccw_device_done(cdev, DEV_STATE_BOXED); 577 break; 578 default: 579 cdev->private->flags.donotify = 0; 580 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 581 break; 582 } 583 } 584 585 /* 586 * Shutdown device. 587 */ 588 int 589 ccw_device_offline(struct ccw_device *cdev) 590 { 591 struct subchannel *sch; 592 593 /* Allow ccw_device_offline while disconnected. */ 594 if (cdev->private->state == DEV_STATE_DISCONNECTED || 595 cdev->private->state == DEV_STATE_NOT_OPER) { 596 cdev->private->flags.donotify = 0; 597 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 598 return 0; 599 } 600 if (cdev->private->state == DEV_STATE_BOXED) { 601 ccw_device_done(cdev, DEV_STATE_BOXED); 602 return 0; 603 } 604 if (ccw_device_is_orphan(cdev)) { 605 ccw_device_done(cdev, DEV_STATE_OFFLINE); 606 return 0; 607 } 608 sch = to_subchannel(cdev->dev.parent); 609 if (cio_update_schib(sch)) 610 return -ENODEV; 611 if (scsw_actl(&sch->schib.scsw) != 0) 612 return -EBUSY; 613 if (cdev->private->state != DEV_STATE_ONLINE) 614 return -EINVAL; 615 /* Are we doing path grouping? */ 616 if (!cdev->private->flags.pgroup) { 617 /* No, set state offline immediately. */ 618 ccw_device_done(cdev, DEV_STATE_OFFLINE); 619 return 0; 620 } 621 /* Start Set Path Group commands. */ 622 cdev->private->state = DEV_STATE_DISBAND_PGID; 623 ccw_device_disband_start(cdev); 624 return 0; 625 } 626 627 /* 628 * Handle not operational event in non-special state. 629 */ 630 static void ccw_device_generic_notoper(struct ccw_device *cdev, 631 enum dev_event dev_event) 632 { 633 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) 634 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 635 else 636 ccw_device_set_disconnected(cdev); 637 } 638 639 /* 640 * Handle path verification event in offline state. 641 */ 642 static void ccw_device_offline_verify(struct ccw_device *cdev, 643 enum dev_event dev_event) 644 { 645 struct subchannel *sch = to_subchannel(cdev->dev.parent); 646 647 css_schedule_eval(sch->schid); 648 } 649 650 /* 651 * Handle path verification event. 652 */ 653 static void 654 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) 655 { 656 struct subchannel *sch; 657 658 if (cdev->private->state == DEV_STATE_W4SENSE) { 659 cdev->private->flags.doverify = 1; 660 return; 661 } 662 sch = to_subchannel(cdev->dev.parent); 663 /* 664 * Since we might not just be coming from an interrupt from the 665 * subchannel we have to update the schib. 666 */ 667 if (cio_update_schib(sch)) { 668 ccw_device_verify_done(cdev, -ENODEV); 669 return; 670 } 671 672 if (scsw_actl(&sch->schib.scsw) != 0 || 673 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || 674 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { 675 /* 676 * No final status yet or final status not yet delivered 677 * to the device driver. Can't do path verification now, 678 * delay until final status was delivered. 679 */ 680 cdev->private->flags.doverify = 1; 681 return; 682 } 683 /* Device is idle, we can do the path verification. */ 684 cdev->private->state = DEV_STATE_VERIFY; 685 ccw_device_verify_start(cdev); 686 } 687 688 /* 689 * Handle path verification event in boxed state. 690 */ 691 static void ccw_device_boxed_verify(struct ccw_device *cdev, 692 enum dev_event dev_event) 693 { 694 struct subchannel *sch = to_subchannel(cdev->dev.parent); 695 696 if (cdev->online) { 697 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) 698 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 699 else 700 ccw_device_online_verify(cdev, dev_event); 701 } else 702 css_schedule_eval(sch->schid); 703 } 704 705 /* 706 * Pass interrupt to device driver. 707 */ 708 static int ccw_device_call_handler(struct ccw_device *cdev) 709 { 710 unsigned int stctl; 711 int ending_status; 712 713 /* 714 * we allow for the device action handler if . 715 * - we received ending status 716 * - the action handler requested to see all interrupts 717 * - we received an intermediate status 718 * - fast notification was requested (primary status) 719 * - unsolicited interrupts 720 */ 721 stctl = scsw_stctl(&cdev->private->irb.scsw); 722 ending_status = (stctl & SCSW_STCTL_SEC_STATUS) || 723 (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) || 724 (stctl == SCSW_STCTL_STATUS_PEND); 725 if (!ending_status && 726 !cdev->private->options.repall && 727 !(stctl & SCSW_STCTL_INTER_STATUS) && 728 !(cdev->private->options.fast && 729 (stctl & SCSW_STCTL_PRIM_STATUS))) 730 return 0; 731 732 if (ending_status) 733 ccw_device_set_timeout(cdev, 0); 734 735 if (cdev->handler) 736 cdev->handler(cdev, cdev->private->intparm, 737 &cdev->private->irb); 738 739 memset(&cdev->private->irb, 0, sizeof(struct irb)); 740 return 1; 741 } 742 743 /* 744 * Got an interrupt for a normal io (state online). 745 */ 746 static void 747 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) 748 { 749 struct irb *irb; 750 int is_cmd; 751 752 irb = this_cpu_ptr(&cio_irb); 753 is_cmd = !scsw_is_tm(&irb->scsw); 754 /* Check for unsolicited interrupt. */ 755 if (!scsw_is_solicited(&irb->scsw)) { 756 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && 757 !irb->esw.esw0.erw.cons) { 758 /* Unit check but no sense data. Need basic sense. */ 759 if (ccw_device_do_sense(cdev, irb) != 0) 760 goto call_handler_unsol; 761 memcpy(&cdev->private->irb, irb, sizeof(struct irb)); 762 cdev->private->state = DEV_STATE_W4SENSE; 763 cdev->private->intparm = 0; 764 return; 765 } 766 call_handler_unsol: 767 if (cdev->handler) 768 cdev->handler (cdev, 0, irb); 769 if (cdev->private->flags.doverify) 770 ccw_device_online_verify(cdev, 0); 771 return; 772 } 773 /* Accumulate status and find out if a basic sense is needed. */ 774 ccw_device_accumulate_irb(cdev, irb); 775 if (is_cmd && cdev->private->flags.dosense) { 776 if (ccw_device_do_sense(cdev, irb) == 0) { 777 cdev->private->state = DEV_STATE_W4SENSE; 778 } 779 return; 780 } 781 /* Call the handler. */ 782 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 783 /* Start delayed path verification. */ 784 ccw_device_online_verify(cdev, 0); 785 } 786 787 /* 788 * Got an timeout in online state. 789 */ 790 static void 791 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) 792 { 793 int ret; 794 795 ccw_device_set_timeout(cdev, 0); 796 cdev->private->iretry = 255; 797 ret = ccw_device_cancel_halt_clear(cdev); 798 if (ret == -EBUSY) { 799 ccw_device_set_timeout(cdev, 3*HZ); 800 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 801 return; 802 } 803 if (ret) 804 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 805 else if (cdev->handler) 806 cdev->handler(cdev, cdev->private->intparm, 807 ERR_PTR(-ETIMEDOUT)); 808 } 809 810 /* 811 * Got an interrupt for a basic sense. 812 */ 813 static void 814 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) 815 { 816 struct irb *irb; 817 818 irb = this_cpu_ptr(&cio_irb); 819 /* Check for unsolicited interrupt. */ 820 if (scsw_stctl(&irb->scsw) == 821 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { 822 if (scsw_cc(&irb->scsw) == 1) 823 /* Basic sense hasn't started. Try again. */ 824 ccw_device_do_sense(cdev, irb); 825 else { 826 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " 827 "interrupt during w4sense...\n", 828 cdev->private->dev_id.ssid, 829 cdev->private->dev_id.devno); 830 if (cdev->handler) 831 cdev->handler (cdev, 0, irb); 832 } 833 return; 834 } 835 /* 836 * Check if a halt or clear has been issued in the meanwhile. If yes, 837 * only deliver the halt/clear interrupt to the device driver as if it 838 * had killed the original request. 839 */ 840 if (scsw_fctl(&irb->scsw) & 841 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { 842 cdev->private->flags.dosense = 0; 843 memset(&cdev->private->irb, 0, sizeof(struct irb)); 844 ccw_device_accumulate_irb(cdev, irb); 845 goto call_handler; 846 } 847 /* Add basic sense info to irb. */ 848 ccw_device_accumulate_basic_sense(cdev, irb); 849 if (cdev->private->flags.dosense) { 850 /* Another basic sense is needed. */ 851 ccw_device_do_sense(cdev, irb); 852 return; 853 } 854 call_handler: 855 cdev->private->state = DEV_STATE_ONLINE; 856 /* In case sensing interfered with setting the device online */ 857 wake_up(&cdev->private->wait_q); 858 /* Call the handler. */ 859 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 860 /* Start delayed path verification. */ 861 ccw_device_online_verify(cdev, 0); 862 } 863 864 static void 865 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) 866 { 867 ccw_device_set_timeout(cdev, 0); 868 /* Start delayed path verification. */ 869 ccw_device_online_verify(cdev, 0); 870 /* OK, i/o is dead now. Call interrupt handler. */ 871 if (cdev->handler) 872 cdev->handler(cdev, cdev->private->intparm, 873 ERR_PTR(-EIO)); 874 } 875 876 static void 877 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) 878 { 879 int ret; 880 881 ret = ccw_device_cancel_halt_clear(cdev); 882 if (ret == -EBUSY) { 883 ccw_device_set_timeout(cdev, 3*HZ); 884 return; 885 } 886 /* Start delayed path verification. */ 887 ccw_device_online_verify(cdev, 0); 888 if (cdev->handler) 889 cdev->handler(cdev, cdev->private->intparm, 890 ERR_PTR(-EIO)); 891 } 892 893 void ccw_device_kill_io(struct ccw_device *cdev) 894 { 895 int ret; 896 897 cdev->private->iretry = 255; 898 ret = ccw_device_cancel_halt_clear(cdev); 899 if (ret == -EBUSY) { 900 ccw_device_set_timeout(cdev, 3*HZ); 901 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 902 return; 903 } 904 /* Start delayed path verification. */ 905 ccw_device_online_verify(cdev, 0); 906 if (cdev->handler) 907 cdev->handler(cdev, cdev->private->intparm, 908 ERR_PTR(-EIO)); 909 } 910 911 static void 912 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) 913 { 914 /* Start verification after current task finished. */ 915 cdev->private->flags.doverify = 1; 916 } 917 918 static void 919 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) 920 { 921 struct subchannel *sch; 922 923 sch = to_subchannel(cdev->dev.parent); 924 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) 925 /* Couldn't enable the subchannel for i/o. Sick device. */ 926 return; 927 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; 928 ccw_device_sense_id_start(cdev); 929 } 930 931 void ccw_device_trigger_reprobe(struct ccw_device *cdev) 932 { 933 struct subchannel *sch; 934 935 if (cdev->private->state != DEV_STATE_DISCONNECTED) 936 return; 937 938 sch = to_subchannel(cdev->dev.parent); 939 /* Update some values. */ 940 if (cio_update_schib(sch)) 941 return; 942 /* 943 * The pim, pam, pom values may not be accurate, but they are the best 944 * we have before performing device selection :/ 945 */ 946 sch->lpm = sch->schib.pmcw.pam & sch->opm; 947 /* 948 * Use the initial configuration since we can't be shure that the old 949 * paths are valid. 950 */ 951 io_subchannel_init_config(sch); 952 if (cio_commit_config(sch)) 953 return; 954 955 /* We should also udate ssd info, but this has to wait. */ 956 /* Check if this is another device which appeared on the same sch. */ 957 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) 958 css_schedule_eval(sch->schid); 959 else 960 ccw_device_start_id(cdev, 0); 961 } 962 963 static void ccw_device_disabled_irq(struct ccw_device *cdev, 964 enum dev_event dev_event) 965 { 966 struct subchannel *sch; 967 968 sch = to_subchannel(cdev->dev.parent); 969 /* 970 * An interrupt in a disabled state means a previous disable was not 971 * successful - should not happen, but we try to disable again. 972 */ 973 cio_disable_subchannel(sch); 974 } 975 976 static void 977 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) 978 { 979 retry_set_schib(cdev); 980 cdev->private->state = DEV_STATE_ONLINE; 981 dev_fsm_event(cdev, dev_event); 982 } 983 984 static void ccw_device_update_cmfblock(struct ccw_device *cdev, 985 enum dev_event dev_event) 986 { 987 cmf_retry_copy_block(cdev); 988 cdev->private->state = DEV_STATE_ONLINE; 989 dev_fsm_event(cdev, dev_event); 990 } 991 992 static void 993 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) 994 { 995 ccw_device_set_timeout(cdev, 0); 996 cdev->private->state = DEV_STATE_NOT_OPER; 997 wake_up(&cdev->private->wait_q); 998 } 999 1000 static void 1001 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) 1002 { 1003 int ret; 1004 1005 ret = ccw_device_cancel_halt_clear(cdev); 1006 if (ret == -EBUSY) { 1007 ccw_device_set_timeout(cdev, HZ/10); 1008 } else { 1009 cdev->private->state = DEV_STATE_NOT_OPER; 1010 wake_up(&cdev->private->wait_q); 1011 } 1012 } 1013 1014 /* 1015 * No operation action. This is used e.g. to ignore a timeout event in 1016 * state offline. 1017 */ 1018 static void 1019 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) 1020 { 1021 } 1022 1023 /* 1024 * device statemachine 1025 */ 1026 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { 1027 [DEV_STATE_NOT_OPER] = { 1028 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1029 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 1030 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1031 [DEV_EVENT_VERIFY] = ccw_device_nop, 1032 }, 1033 [DEV_STATE_SENSE_ID] = { 1034 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1035 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1036 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1037 [DEV_EVENT_VERIFY] = ccw_device_nop, 1038 }, 1039 [DEV_STATE_OFFLINE] = { 1040 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1041 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 1042 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1043 [DEV_EVENT_VERIFY] = ccw_device_offline_verify, 1044 }, 1045 [DEV_STATE_VERIFY] = { 1046 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1047 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1048 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1049 [DEV_EVENT_VERIFY] = ccw_device_delay_verify, 1050 }, 1051 [DEV_STATE_ONLINE] = { 1052 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1053 [DEV_EVENT_INTERRUPT] = ccw_device_irq, 1054 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, 1055 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1056 }, 1057 [DEV_STATE_W4SENSE] = { 1058 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1059 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, 1060 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1061 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1062 }, 1063 [DEV_STATE_DISBAND_PGID] = { 1064 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1065 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1066 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1067 [DEV_EVENT_VERIFY] = ccw_device_nop, 1068 }, 1069 [DEV_STATE_BOXED] = { 1070 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1071 [DEV_EVENT_INTERRUPT] = ccw_device_nop, 1072 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1073 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify, 1074 }, 1075 /* states to wait for i/o completion before doing something */ 1076 [DEV_STATE_TIMEOUT_KILL] = { 1077 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1078 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, 1079 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, 1080 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME 1081 }, 1082 [DEV_STATE_QUIESCE] = { 1083 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, 1084 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, 1085 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, 1086 [DEV_EVENT_VERIFY] = ccw_device_nop, 1087 }, 1088 /* special states for devices gone not operational */ 1089 [DEV_STATE_DISCONNECTED] = { 1090 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1091 [DEV_EVENT_INTERRUPT] = ccw_device_start_id, 1092 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1093 [DEV_EVENT_VERIFY] = ccw_device_start_id, 1094 }, 1095 [DEV_STATE_DISCONNECTED_SENSE_ID] = { 1096 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1097 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1098 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1099 [DEV_EVENT_VERIFY] = ccw_device_nop, 1100 }, 1101 [DEV_STATE_CMFCHANGE] = { 1102 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, 1103 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, 1104 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, 1105 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, 1106 }, 1107 [DEV_STATE_CMFUPDATE] = { 1108 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, 1109 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, 1110 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, 1111 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, 1112 }, 1113 [DEV_STATE_STEAL_LOCK] = { 1114 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1115 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1116 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1117 [DEV_EVENT_VERIFY] = ccw_device_nop, 1118 }, 1119 }; 1120 1121 EXPORT_SYMBOL_GPL(ccw_device_set_timeout); 1122