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 static void 95 ccw_device_timeout(unsigned long data) 96 { 97 struct ccw_device *cdev; 98 99 cdev = (struct ccw_device *) data; 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.function = ccw_device_timeout; 122 cdev->private->timer.data = (unsigned long) cdev; 123 cdev->private->timer.expires = jiffies + expires; 124 add_timer(&cdev->private->timer); 125 } 126 127 int 128 ccw_device_cancel_halt_clear(struct ccw_device *cdev) 129 { 130 struct subchannel *sch; 131 int ret; 132 133 sch = to_subchannel(cdev->dev.parent); 134 ret = cio_cancel_halt_clear(sch, &cdev->private->iretry); 135 136 if (ret == -EIO) 137 CIO_MSG_EVENT(0, "0.%x.%04x: could not stop I/O\n", 138 cdev->private->dev_id.ssid, 139 cdev->private->dev_id.devno); 140 141 return ret; 142 } 143 144 void ccw_device_update_sense_data(struct ccw_device *cdev) 145 { 146 memset(&cdev->id, 0, sizeof(cdev->id)); 147 cdev->id.cu_type = cdev->private->senseid.cu_type; 148 cdev->id.cu_model = cdev->private->senseid.cu_model; 149 cdev->id.dev_type = cdev->private->senseid.dev_type; 150 cdev->id.dev_model = cdev->private->senseid.dev_model; 151 } 152 153 int ccw_device_test_sense_data(struct ccw_device *cdev) 154 { 155 return cdev->id.cu_type == cdev->private->senseid.cu_type && 156 cdev->id.cu_model == cdev->private->senseid.cu_model && 157 cdev->id.dev_type == cdev->private->senseid.dev_type && 158 cdev->id.dev_model == cdev->private->senseid.dev_model; 159 } 160 161 /* 162 * The machine won't give us any notification by machine check if a chpid has 163 * been varied online on the SE so we have to find out by magic (i. e. driving 164 * the channel subsystem to device selection and updating our path masks). 165 */ 166 static void 167 __recover_lost_chpids(struct subchannel *sch, int old_lpm) 168 { 169 int mask, i; 170 struct chp_id chpid; 171 172 chp_id_init(&chpid); 173 for (i = 0; i<8; i++) { 174 mask = 0x80 >> i; 175 if (!(sch->lpm & mask)) 176 continue; 177 if (old_lpm & mask) 178 continue; 179 chpid.id = sch->schib.pmcw.chpid[i]; 180 if (!chp_is_registered(chpid)) 181 css_schedule_eval_all(); 182 } 183 } 184 185 /* 186 * Stop device recognition. 187 */ 188 static void 189 ccw_device_recog_done(struct ccw_device *cdev, int state) 190 { 191 struct subchannel *sch; 192 int old_lpm; 193 194 sch = to_subchannel(cdev->dev.parent); 195 196 if (cio_disable_subchannel(sch)) 197 state = DEV_STATE_NOT_OPER; 198 /* 199 * Now that we tried recognition, we have performed device selection 200 * through ssch() and the path information is up to date. 201 */ 202 old_lpm = sch->lpm; 203 204 /* Check since device may again have become not operational. */ 205 if (cio_update_schib(sch)) 206 state = DEV_STATE_NOT_OPER; 207 else 208 sch->lpm = sch->schib.pmcw.pam & sch->opm; 209 210 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) 211 /* Force reprobe on all chpids. */ 212 old_lpm = 0; 213 if (sch->lpm != old_lpm) 214 __recover_lost_chpids(sch, old_lpm); 215 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID && 216 (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) { 217 cdev->private->flags.recog_done = 1; 218 cdev->private->state = DEV_STATE_DISCONNECTED; 219 wake_up(&cdev->private->wait_q); 220 return; 221 } 222 if (cdev->private->flags.resuming) { 223 cdev->private->state = state; 224 cdev->private->flags.recog_done = 1; 225 wake_up(&cdev->private->wait_q); 226 return; 227 } 228 switch (state) { 229 case DEV_STATE_NOT_OPER: 230 break; 231 case DEV_STATE_OFFLINE: 232 if (!cdev->online) { 233 ccw_device_update_sense_data(cdev); 234 break; 235 } 236 cdev->private->state = DEV_STATE_OFFLINE; 237 cdev->private->flags.recog_done = 1; 238 if (ccw_device_test_sense_data(cdev)) { 239 cdev->private->flags.donotify = 1; 240 ccw_device_online(cdev); 241 wake_up(&cdev->private->wait_q); 242 } else { 243 ccw_device_update_sense_data(cdev); 244 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); 245 } 246 return; 247 case DEV_STATE_BOXED: 248 if (cdev->id.cu_type != 0) { /* device was recognized before */ 249 cdev->private->flags.recog_done = 1; 250 cdev->private->state = DEV_STATE_BOXED; 251 wake_up(&cdev->private->wait_q); 252 return; 253 } 254 break; 255 } 256 cdev->private->state = state; 257 io_subchannel_recog_done(cdev); 258 wake_up(&cdev->private->wait_q); 259 } 260 261 /* 262 * Function called from device_id.c after sense id has completed. 263 */ 264 void 265 ccw_device_sense_id_done(struct ccw_device *cdev, int err) 266 { 267 switch (err) { 268 case 0: 269 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); 270 break; 271 case -ETIME: /* Sense id stopped by timeout. */ 272 ccw_device_recog_done(cdev, DEV_STATE_BOXED); 273 break; 274 default: 275 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); 276 break; 277 } 278 } 279 280 /** 281 * ccw_device_notify() - inform the device's driver about an event 282 * @cdev: device for which an event occurred 283 * @event: event that occurred 284 * 285 * Returns: 286 * -%EINVAL if the device is offline or has no driver. 287 * -%EOPNOTSUPP if the device's driver has no notifier registered. 288 * %NOTIFY_OK if the driver wants to keep the device. 289 * %NOTIFY_BAD if the driver doesn't want to keep the device. 290 */ 291 int ccw_device_notify(struct ccw_device *cdev, int event) 292 { 293 int ret = -EINVAL; 294 295 if (!cdev->drv) 296 goto out; 297 if (!cdev->online) 298 goto out; 299 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", 300 cdev->private->dev_id.ssid, cdev->private->dev_id.devno, 301 event); 302 if (!cdev->drv->notify) { 303 ret = -EOPNOTSUPP; 304 goto out; 305 } 306 if (cdev->drv->notify(cdev, event)) 307 ret = NOTIFY_OK; 308 else 309 ret = NOTIFY_BAD; 310 out: 311 return ret; 312 } 313 314 static void ccw_device_oper_notify(struct ccw_device *cdev) 315 { 316 struct subchannel *sch = to_subchannel(cdev->dev.parent); 317 318 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) { 319 /* Reenable channel measurements, if needed. */ 320 ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF); 321 /* Save indication for new paths. */ 322 cdev->private->path_new_mask = sch->vpm; 323 return; 324 } 325 /* Driver doesn't want device back. */ 326 ccw_device_set_notoper(cdev); 327 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); 328 } 329 330 /* 331 * Finished with online/offline processing. 332 */ 333 static void 334 ccw_device_done(struct ccw_device *cdev, int state) 335 { 336 struct subchannel *sch; 337 338 sch = to_subchannel(cdev->dev.parent); 339 340 ccw_device_set_timeout(cdev, 0); 341 342 if (state != DEV_STATE_ONLINE) 343 cio_disable_subchannel(sch); 344 345 /* Reset device status. */ 346 memset(&cdev->private->irb, 0, sizeof(struct irb)); 347 348 cdev->private->state = state; 349 350 switch (state) { 351 case DEV_STATE_BOXED: 352 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", 353 cdev->private->dev_id.devno, sch->schid.sch_no); 354 if (cdev->online && 355 ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK) 356 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 357 cdev->private->flags.donotify = 0; 358 break; 359 case DEV_STATE_NOT_OPER: 360 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n", 361 cdev->private->dev_id.devno, sch->schid.sch_no); 362 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) 363 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 364 else 365 ccw_device_set_disconnected(cdev); 366 cdev->private->flags.donotify = 0; 367 break; 368 case DEV_STATE_DISCONNECTED: 369 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel " 370 "%04x\n", cdev->private->dev_id.devno, 371 sch->schid.sch_no); 372 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) { 373 cdev->private->state = DEV_STATE_NOT_OPER; 374 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 375 } else 376 ccw_device_set_disconnected(cdev); 377 cdev->private->flags.donotify = 0; 378 break; 379 default: 380 break; 381 } 382 383 if (cdev->private->flags.donotify) { 384 cdev->private->flags.donotify = 0; 385 ccw_device_oper_notify(cdev); 386 } 387 wake_up(&cdev->private->wait_q); 388 } 389 390 /* 391 * Start device recognition. 392 */ 393 void ccw_device_recognition(struct ccw_device *cdev) 394 { 395 struct subchannel *sch = to_subchannel(cdev->dev.parent); 396 397 /* 398 * We used to start here with a sense pgid to find out whether a device 399 * is locked by someone else. Unfortunately, the sense pgid command 400 * code has other meanings on devices predating the path grouping 401 * algorithm, so we start with sense id and box the device after an 402 * timeout (or if sense pgid during path verification detects the device 403 * is locked, as may happen on newer devices). 404 */ 405 cdev->private->flags.recog_done = 0; 406 cdev->private->state = DEV_STATE_SENSE_ID; 407 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) { 408 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); 409 return; 410 } 411 ccw_device_sense_id_start(cdev); 412 } 413 414 /* 415 * Handle events for states that use the ccw request infrastructure. 416 */ 417 static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e) 418 { 419 switch (e) { 420 case DEV_EVENT_NOTOPER: 421 ccw_request_notoper(cdev); 422 break; 423 case DEV_EVENT_INTERRUPT: 424 ccw_request_handler(cdev); 425 break; 426 case DEV_EVENT_TIMEOUT: 427 ccw_request_timeout(cdev); 428 break; 429 default: 430 break; 431 } 432 } 433 434 static void ccw_device_report_path_events(struct ccw_device *cdev) 435 { 436 struct subchannel *sch = to_subchannel(cdev->dev.parent); 437 int path_event[8]; 438 int chp, mask; 439 440 for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) { 441 path_event[chp] = PE_NONE; 442 if (mask & cdev->private->path_gone_mask & ~(sch->vpm)) 443 path_event[chp] |= PE_PATH_GONE; 444 if (mask & cdev->private->path_new_mask & sch->vpm) 445 path_event[chp] |= PE_PATH_AVAILABLE; 446 if (mask & cdev->private->pgid_reset_mask & sch->vpm) 447 path_event[chp] |= PE_PATHGROUP_ESTABLISHED; 448 } 449 if (cdev->online && cdev->drv->path_event) 450 cdev->drv->path_event(cdev, path_event); 451 } 452 453 static void ccw_device_reset_path_events(struct ccw_device *cdev) 454 { 455 cdev->private->path_gone_mask = 0; 456 cdev->private->path_new_mask = 0; 457 cdev->private->pgid_reset_mask = 0; 458 } 459 460 static void create_fake_irb(struct irb *irb, int type) 461 { 462 memset(irb, 0, sizeof(*irb)); 463 if (type == FAKE_CMD_IRB) { 464 struct cmd_scsw *scsw = &irb->scsw.cmd; 465 scsw->cc = 1; 466 scsw->fctl = SCSW_FCTL_START_FUNC; 467 scsw->actl = SCSW_ACTL_START_PEND; 468 scsw->stctl = SCSW_STCTL_STATUS_PEND; 469 } else if (type == FAKE_TM_IRB) { 470 struct tm_scsw *scsw = &irb->scsw.tm; 471 scsw->x = 1; 472 scsw->cc = 1; 473 scsw->fctl = SCSW_FCTL_START_FUNC; 474 scsw->actl = SCSW_ACTL_START_PEND; 475 scsw->stctl = SCSW_STCTL_STATUS_PEND; 476 } 477 } 478 479 static void ccw_device_handle_broken_paths(struct ccw_device *cdev) 480 { 481 struct subchannel *sch = to_subchannel(cdev->dev.parent); 482 u8 broken_paths = (sch->schib.pmcw.pam & sch->opm) ^ sch->vpm; 483 484 if (broken_paths && (cdev->private->path_broken_mask != broken_paths)) 485 ccw_device_schedule_recovery(); 486 487 cdev->private->path_broken_mask = broken_paths; 488 } 489 490 void ccw_device_verify_done(struct ccw_device *cdev, int err) 491 { 492 struct subchannel *sch; 493 494 sch = to_subchannel(cdev->dev.parent); 495 /* Update schib - pom may have changed. */ 496 if (cio_update_schib(sch)) { 497 err = -ENODEV; 498 goto callback; 499 } 500 /* Update lpm with verified path mask. */ 501 sch->lpm = sch->vpm; 502 /* Repeat path verification? */ 503 if (cdev->private->flags.doverify) { 504 ccw_device_verify_start(cdev); 505 return; 506 } 507 callback: 508 switch (err) { 509 case 0: 510 ccw_device_done(cdev, DEV_STATE_ONLINE); 511 /* Deliver fake irb to device driver, if needed. */ 512 if (cdev->private->flags.fake_irb) { 513 create_fake_irb(&cdev->private->irb, 514 cdev->private->flags.fake_irb); 515 cdev->private->flags.fake_irb = 0; 516 if (cdev->handler) 517 cdev->handler(cdev, cdev->private->intparm, 518 &cdev->private->irb); 519 memset(&cdev->private->irb, 0, sizeof(struct irb)); 520 } 521 ccw_device_report_path_events(cdev); 522 ccw_device_handle_broken_paths(cdev); 523 break; 524 case -ETIME: 525 case -EUSERS: 526 /* Reset oper notify indication after verify error. */ 527 cdev->private->flags.donotify = 0; 528 ccw_device_done(cdev, DEV_STATE_BOXED); 529 break; 530 case -EACCES: 531 /* Reset oper notify indication after verify error. */ 532 cdev->private->flags.donotify = 0; 533 ccw_device_done(cdev, DEV_STATE_DISCONNECTED); 534 break; 535 default: 536 /* Reset oper notify indication after verify error. */ 537 cdev->private->flags.donotify = 0; 538 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 539 break; 540 } 541 ccw_device_reset_path_events(cdev); 542 } 543 544 /* 545 * Get device online. 546 */ 547 int 548 ccw_device_online(struct ccw_device *cdev) 549 { 550 struct subchannel *sch; 551 int ret; 552 553 if ((cdev->private->state != DEV_STATE_OFFLINE) && 554 (cdev->private->state != DEV_STATE_BOXED)) 555 return -EINVAL; 556 sch = to_subchannel(cdev->dev.parent); 557 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); 558 if (ret != 0) { 559 /* Couldn't enable the subchannel for i/o. Sick device. */ 560 if (ret == -ENODEV) 561 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 562 return ret; 563 } 564 /* Start initial path verification. */ 565 cdev->private->state = DEV_STATE_VERIFY; 566 ccw_device_verify_start(cdev); 567 return 0; 568 } 569 570 void 571 ccw_device_disband_done(struct ccw_device *cdev, int err) 572 { 573 switch (err) { 574 case 0: 575 ccw_device_done(cdev, DEV_STATE_OFFLINE); 576 break; 577 case -ETIME: 578 ccw_device_done(cdev, DEV_STATE_BOXED); 579 break; 580 default: 581 cdev->private->flags.donotify = 0; 582 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 583 break; 584 } 585 } 586 587 /* 588 * Shutdown device. 589 */ 590 int 591 ccw_device_offline(struct ccw_device *cdev) 592 { 593 struct subchannel *sch; 594 595 /* Allow ccw_device_offline while disconnected. */ 596 if (cdev->private->state == DEV_STATE_DISCONNECTED || 597 cdev->private->state == DEV_STATE_NOT_OPER) { 598 cdev->private->flags.donotify = 0; 599 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 600 return 0; 601 } 602 if (cdev->private->state == DEV_STATE_BOXED) { 603 ccw_device_done(cdev, DEV_STATE_BOXED); 604 return 0; 605 } 606 if (ccw_device_is_orphan(cdev)) { 607 ccw_device_done(cdev, DEV_STATE_OFFLINE); 608 return 0; 609 } 610 sch = to_subchannel(cdev->dev.parent); 611 if (cio_update_schib(sch)) 612 return -ENODEV; 613 if (scsw_actl(&sch->schib.scsw) != 0) 614 return -EBUSY; 615 if (cdev->private->state != DEV_STATE_ONLINE) 616 return -EINVAL; 617 /* Are we doing path grouping? */ 618 if (!cdev->private->flags.pgroup) { 619 /* No, set state offline immediately. */ 620 ccw_device_done(cdev, DEV_STATE_OFFLINE); 621 return 0; 622 } 623 /* Start Set Path Group commands. */ 624 cdev->private->state = DEV_STATE_DISBAND_PGID; 625 ccw_device_disband_start(cdev); 626 return 0; 627 } 628 629 /* 630 * Handle not operational event in non-special state. 631 */ 632 static void ccw_device_generic_notoper(struct ccw_device *cdev, 633 enum dev_event dev_event) 634 { 635 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) 636 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 637 else 638 ccw_device_set_disconnected(cdev); 639 } 640 641 /* 642 * Handle path verification event in offline state. 643 */ 644 static void ccw_device_offline_verify(struct ccw_device *cdev, 645 enum dev_event dev_event) 646 { 647 struct subchannel *sch = to_subchannel(cdev->dev.parent); 648 649 css_schedule_eval(sch->schid); 650 } 651 652 /* 653 * Handle path verification event. 654 */ 655 static void 656 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) 657 { 658 struct subchannel *sch; 659 660 if (cdev->private->state == DEV_STATE_W4SENSE) { 661 cdev->private->flags.doverify = 1; 662 return; 663 } 664 sch = to_subchannel(cdev->dev.parent); 665 /* 666 * Since we might not just be coming from an interrupt from the 667 * subchannel we have to update the schib. 668 */ 669 if (cio_update_schib(sch)) { 670 ccw_device_verify_done(cdev, -ENODEV); 671 return; 672 } 673 674 if (scsw_actl(&sch->schib.scsw) != 0 || 675 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || 676 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { 677 /* 678 * No final status yet or final status not yet delivered 679 * to the device driver. Can't do path verification now, 680 * delay until final status was delivered. 681 */ 682 cdev->private->flags.doverify = 1; 683 return; 684 } 685 /* Device is idle, we can do the path verification. */ 686 cdev->private->state = DEV_STATE_VERIFY; 687 ccw_device_verify_start(cdev); 688 } 689 690 /* 691 * Handle path verification event in boxed state. 692 */ 693 static void ccw_device_boxed_verify(struct ccw_device *cdev, 694 enum dev_event dev_event) 695 { 696 struct subchannel *sch = to_subchannel(cdev->dev.parent); 697 698 if (cdev->online) { 699 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) 700 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 701 else 702 ccw_device_online_verify(cdev, dev_event); 703 } else 704 css_schedule_eval(sch->schid); 705 } 706 707 /* 708 * Pass interrupt to device driver. 709 */ 710 static int ccw_device_call_handler(struct ccw_device *cdev) 711 { 712 unsigned int stctl; 713 int ending_status; 714 715 /* 716 * we allow for the device action handler if . 717 * - we received ending status 718 * - the action handler requested to see all interrupts 719 * - we received an intermediate status 720 * - fast notification was requested (primary status) 721 * - unsolicited interrupts 722 */ 723 stctl = scsw_stctl(&cdev->private->irb.scsw); 724 ending_status = (stctl & SCSW_STCTL_SEC_STATUS) || 725 (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) || 726 (stctl == SCSW_STCTL_STATUS_PEND); 727 if (!ending_status && 728 !cdev->private->options.repall && 729 !(stctl & SCSW_STCTL_INTER_STATUS) && 730 !(cdev->private->options.fast && 731 (stctl & SCSW_STCTL_PRIM_STATUS))) 732 return 0; 733 734 if (ending_status) 735 ccw_device_set_timeout(cdev, 0); 736 737 if (cdev->handler) 738 cdev->handler(cdev, cdev->private->intparm, 739 &cdev->private->irb); 740 741 memset(&cdev->private->irb, 0, sizeof(struct irb)); 742 return 1; 743 } 744 745 /* 746 * Got an interrupt for a normal io (state online). 747 */ 748 static void 749 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) 750 { 751 struct irb *irb; 752 int is_cmd; 753 754 irb = this_cpu_ptr(&cio_irb); 755 is_cmd = !scsw_is_tm(&irb->scsw); 756 /* Check for unsolicited interrupt. */ 757 if (!scsw_is_solicited(&irb->scsw)) { 758 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && 759 !irb->esw.esw0.erw.cons) { 760 /* Unit check but no sense data. Need basic sense. */ 761 if (ccw_device_do_sense(cdev, irb) != 0) 762 goto call_handler_unsol; 763 memcpy(&cdev->private->irb, irb, sizeof(struct irb)); 764 cdev->private->state = DEV_STATE_W4SENSE; 765 cdev->private->intparm = 0; 766 return; 767 } 768 call_handler_unsol: 769 if (cdev->handler) 770 cdev->handler (cdev, 0, irb); 771 if (cdev->private->flags.doverify) 772 ccw_device_online_verify(cdev, 0); 773 return; 774 } 775 /* Accumulate status and find out if a basic sense is needed. */ 776 ccw_device_accumulate_irb(cdev, irb); 777 if (is_cmd && cdev->private->flags.dosense) { 778 if (ccw_device_do_sense(cdev, irb) == 0) { 779 cdev->private->state = DEV_STATE_W4SENSE; 780 } 781 return; 782 } 783 /* Call the handler. */ 784 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 785 /* Start delayed path verification. */ 786 ccw_device_online_verify(cdev, 0); 787 } 788 789 /* 790 * Got an timeout in online state. 791 */ 792 static void 793 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) 794 { 795 int ret; 796 797 ccw_device_set_timeout(cdev, 0); 798 cdev->private->iretry = 255; 799 ret = ccw_device_cancel_halt_clear(cdev); 800 if (ret == -EBUSY) { 801 ccw_device_set_timeout(cdev, 3*HZ); 802 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 803 return; 804 } 805 if (ret) 806 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 807 else if (cdev->handler) 808 cdev->handler(cdev, cdev->private->intparm, 809 ERR_PTR(-ETIMEDOUT)); 810 } 811 812 /* 813 * Got an interrupt for a basic sense. 814 */ 815 static void 816 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) 817 { 818 struct irb *irb; 819 820 irb = this_cpu_ptr(&cio_irb); 821 /* Check for unsolicited interrupt. */ 822 if (scsw_stctl(&irb->scsw) == 823 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { 824 if (scsw_cc(&irb->scsw) == 1) 825 /* Basic sense hasn't started. Try again. */ 826 ccw_device_do_sense(cdev, irb); 827 else { 828 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " 829 "interrupt during w4sense...\n", 830 cdev->private->dev_id.ssid, 831 cdev->private->dev_id.devno); 832 if (cdev->handler) 833 cdev->handler (cdev, 0, irb); 834 } 835 return; 836 } 837 /* 838 * Check if a halt or clear has been issued in the meanwhile. If yes, 839 * only deliver the halt/clear interrupt to the device driver as if it 840 * had killed the original request. 841 */ 842 if (scsw_fctl(&irb->scsw) & 843 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { 844 cdev->private->flags.dosense = 0; 845 memset(&cdev->private->irb, 0, sizeof(struct irb)); 846 ccw_device_accumulate_irb(cdev, irb); 847 goto call_handler; 848 } 849 /* Add basic sense info to irb. */ 850 ccw_device_accumulate_basic_sense(cdev, irb); 851 if (cdev->private->flags.dosense) { 852 /* Another basic sense is needed. */ 853 ccw_device_do_sense(cdev, irb); 854 return; 855 } 856 call_handler: 857 cdev->private->state = DEV_STATE_ONLINE; 858 /* In case sensing interfered with setting the device online */ 859 wake_up(&cdev->private->wait_q); 860 /* Call the handler. */ 861 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 862 /* Start delayed path verification. */ 863 ccw_device_online_verify(cdev, 0); 864 } 865 866 static void 867 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) 868 { 869 ccw_device_set_timeout(cdev, 0); 870 /* Start delayed path verification. */ 871 ccw_device_online_verify(cdev, 0); 872 /* OK, i/o is dead now. Call interrupt handler. */ 873 if (cdev->handler) 874 cdev->handler(cdev, cdev->private->intparm, 875 ERR_PTR(-EIO)); 876 } 877 878 static void 879 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) 880 { 881 int ret; 882 883 ret = ccw_device_cancel_halt_clear(cdev); 884 if (ret == -EBUSY) { 885 ccw_device_set_timeout(cdev, 3*HZ); 886 return; 887 } 888 /* Start delayed path verification. */ 889 ccw_device_online_verify(cdev, 0); 890 if (cdev->handler) 891 cdev->handler(cdev, cdev->private->intparm, 892 ERR_PTR(-EIO)); 893 } 894 895 void ccw_device_kill_io(struct ccw_device *cdev) 896 { 897 int ret; 898 899 cdev->private->iretry = 255; 900 ret = ccw_device_cancel_halt_clear(cdev); 901 if (ret == -EBUSY) { 902 ccw_device_set_timeout(cdev, 3*HZ); 903 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 904 return; 905 } 906 /* Start delayed path verification. */ 907 ccw_device_online_verify(cdev, 0); 908 if (cdev->handler) 909 cdev->handler(cdev, cdev->private->intparm, 910 ERR_PTR(-EIO)); 911 } 912 913 static void 914 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) 915 { 916 /* Start verification after current task finished. */ 917 cdev->private->flags.doverify = 1; 918 } 919 920 static void 921 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) 922 { 923 struct subchannel *sch; 924 925 sch = to_subchannel(cdev->dev.parent); 926 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) 927 /* Couldn't enable the subchannel for i/o. Sick device. */ 928 return; 929 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; 930 ccw_device_sense_id_start(cdev); 931 } 932 933 void ccw_device_trigger_reprobe(struct ccw_device *cdev) 934 { 935 struct subchannel *sch; 936 937 if (cdev->private->state != DEV_STATE_DISCONNECTED) 938 return; 939 940 sch = to_subchannel(cdev->dev.parent); 941 /* Update some values. */ 942 if (cio_update_schib(sch)) 943 return; 944 /* 945 * The pim, pam, pom values may not be accurate, but they are the best 946 * we have before performing device selection :/ 947 */ 948 sch->lpm = sch->schib.pmcw.pam & sch->opm; 949 /* 950 * Use the initial configuration since we can't be shure that the old 951 * paths are valid. 952 */ 953 io_subchannel_init_config(sch); 954 if (cio_commit_config(sch)) 955 return; 956 957 /* We should also udate ssd info, but this has to wait. */ 958 /* Check if this is another device which appeared on the same sch. */ 959 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) 960 css_schedule_eval(sch->schid); 961 else 962 ccw_device_start_id(cdev, 0); 963 } 964 965 static void ccw_device_disabled_irq(struct ccw_device *cdev, 966 enum dev_event dev_event) 967 { 968 struct subchannel *sch; 969 970 sch = to_subchannel(cdev->dev.parent); 971 /* 972 * An interrupt in a disabled state means a previous disable was not 973 * successful - should not happen, but we try to disable again. 974 */ 975 cio_disable_subchannel(sch); 976 } 977 978 static void 979 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) 980 { 981 retry_set_schib(cdev); 982 cdev->private->state = DEV_STATE_ONLINE; 983 dev_fsm_event(cdev, dev_event); 984 } 985 986 static void ccw_device_update_cmfblock(struct ccw_device *cdev, 987 enum dev_event dev_event) 988 { 989 cmf_retry_copy_block(cdev); 990 cdev->private->state = DEV_STATE_ONLINE; 991 dev_fsm_event(cdev, dev_event); 992 } 993 994 static void 995 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) 996 { 997 ccw_device_set_timeout(cdev, 0); 998 cdev->private->state = DEV_STATE_NOT_OPER; 999 wake_up(&cdev->private->wait_q); 1000 } 1001 1002 static void 1003 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) 1004 { 1005 int ret; 1006 1007 ret = ccw_device_cancel_halt_clear(cdev); 1008 if (ret == -EBUSY) { 1009 ccw_device_set_timeout(cdev, HZ/10); 1010 } else { 1011 cdev->private->state = DEV_STATE_NOT_OPER; 1012 wake_up(&cdev->private->wait_q); 1013 } 1014 } 1015 1016 /* 1017 * No operation action. This is used e.g. to ignore a timeout event in 1018 * state offline. 1019 */ 1020 static void 1021 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) 1022 { 1023 } 1024 1025 /* 1026 * device statemachine 1027 */ 1028 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { 1029 [DEV_STATE_NOT_OPER] = { 1030 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1031 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 1032 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1033 [DEV_EVENT_VERIFY] = ccw_device_nop, 1034 }, 1035 [DEV_STATE_SENSE_ID] = { 1036 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1037 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1038 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1039 [DEV_EVENT_VERIFY] = ccw_device_nop, 1040 }, 1041 [DEV_STATE_OFFLINE] = { 1042 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1043 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 1044 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1045 [DEV_EVENT_VERIFY] = ccw_device_offline_verify, 1046 }, 1047 [DEV_STATE_VERIFY] = { 1048 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1049 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1050 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1051 [DEV_EVENT_VERIFY] = ccw_device_delay_verify, 1052 }, 1053 [DEV_STATE_ONLINE] = { 1054 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1055 [DEV_EVENT_INTERRUPT] = ccw_device_irq, 1056 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, 1057 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1058 }, 1059 [DEV_STATE_W4SENSE] = { 1060 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1061 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, 1062 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1063 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1064 }, 1065 [DEV_STATE_DISBAND_PGID] = { 1066 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1067 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1068 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1069 [DEV_EVENT_VERIFY] = ccw_device_nop, 1070 }, 1071 [DEV_STATE_BOXED] = { 1072 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1073 [DEV_EVENT_INTERRUPT] = ccw_device_nop, 1074 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1075 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify, 1076 }, 1077 /* states to wait for i/o completion before doing something */ 1078 [DEV_STATE_TIMEOUT_KILL] = { 1079 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1080 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, 1081 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, 1082 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME 1083 }, 1084 [DEV_STATE_QUIESCE] = { 1085 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, 1086 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, 1087 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, 1088 [DEV_EVENT_VERIFY] = ccw_device_nop, 1089 }, 1090 /* special states for devices gone not operational */ 1091 [DEV_STATE_DISCONNECTED] = { 1092 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1093 [DEV_EVENT_INTERRUPT] = ccw_device_start_id, 1094 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1095 [DEV_EVENT_VERIFY] = ccw_device_start_id, 1096 }, 1097 [DEV_STATE_DISCONNECTED_SENSE_ID] = { 1098 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1099 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1100 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1101 [DEV_EVENT_VERIFY] = ccw_device_nop, 1102 }, 1103 [DEV_STATE_CMFCHANGE] = { 1104 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, 1105 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, 1106 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, 1107 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, 1108 }, 1109 [DEV_STATE_CMFUPDATE] = { 1110 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, 1111 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, 1112 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, 1113 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, 1114 }, 1115 [DEV_STATE_STEAL_LOCK] = { 1116 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1117 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1118 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1119 [DEV_EVENT_VERIFY] = ccw_device_nop, 1120 }, 1121 }; 1122 1123 EXPORT_SYMBOL_GPL(ccw_device_set_timeout); 1124