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 void ccw_device_verify_done(struct ccw_device *cdev, int err) 480 { 481 struct subchannel *sch; 482 483 sch = to_subchannel(cdev->dev.parent); 484 /* Update schib - pom may have changed. */ 485 if (cio_update_schib(sch)) { 486 err = -ENODEV; 487 goto callback; 488 } 489 /* Update lpm with verified path mask. */ 490 sch->lpm = sch->vpm; 491 /* Repeat path verification? */ 492 if (cdev->private->flags.doverify) { 493 ccw_device_verify_start(cdev); 494 return; 495 } 496 callback: 497 switch (err) { 498 case 0: 499 ccw_device_done(cdev, DEV_STATE_ONLINE); 500 /* Deliver fake irb to device driver, if needed. */ 501 if (cdev->private->flags.fake_irb) { 502 create_fake_irb(&cdev->private->irb, 503 cdev->private->flags.fake_irb); 504 cdev->private->flags.fake_irb = 0; 505 if (cdev->handler) 506 cdev->handler(cdev, cdev->private->intparm, 507 &cdev->private->irb); 508 memset(&cdev->private->irb, 0, sizeof(struct irb)); 509 } 510 ccw_device_report_path_events(cdev); 511 break; 512 case -ETIME: 513 case -EUSERS: 514 /* Reset oper notify indication after verify error. */ 515 cdev->private->flags.donotify = 0; 516 ccw_device_done(cdev, DEV_STATE_BOXED); 517 break; 518 case -EACCES: 519 /* Reset oper notify indication after verify error. */ 520 cdev->private->flags.donotify = 0; 521 ccw_device_done(cdev, DEV_STATE_DISCONNECTED); 522 break; 523 default: 524 /* Reset oper notify indication after verify error. */ 525 cdev->private->flags.donotify = 0; 526 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 527 break; 528 } 529 ccw_device_reset_path_events(cdev); 530 } 531 532 /* 533 * Get device online. 534 */ 535 int 536 ccw_device_online(struct ccw_device *cdev) 537 { 538 struct subchannel *sch; 539 int ret; 540 541 if ((cdev->private->state != DEV_STATE_OFFLINE) && 542 (cdev->private->state != DEV_STATE_BOXED)) 543 return -EINVAL; 544 sch = to_subchannel(cdev->dev.parent); 545 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); 546 if (ret != 0) { 547 /* Couldn't enable the subchannel for i/o. Sick device. */ 548 if (ret == -ENODEV) 549 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 550 return ret; 551 } 552 /* Start initial path verification. */ 553 cdev->private->state = DEV_STATE_VERIFY; 554 ccw_device_verify_start(cdev); 555 return 0; 556 } 557 558 void 559 ccw_device_disband_done(struct ccw_device *cdev, int err) 560 { 561 switch (err) { 562 case 0: 563 ccw_device_done(cdev, DEV_STATE_OFFLINE); 564 break; 565 case -ETIME: 566 ccw_device_done(cdev, DEV_STATE_BOXED); 567 break; 568 default: 569 cdev->private->flags.donotify = 0; 570 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 571 break; 572 } 573 } 574 575 /* 576 * Shutdown device. 577 */ 578 int 579 ccw_device_offline(struct ccw_device *cdev) 580 { 581 struct subchannel *sch; 582 583 /* Allow ccw_device_offline while disconnected. */ 584 if (cdev->private->state == DEV_STATE_DISCONNECTED || 585 cdev->private->state == DEV_STATE_NOT_OPER) { 586 cdev->private->flags.donotify = 0; 587 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 588 return 0; 589 } 590 if (cdev->private->state == DEV_STATE_BOXED) { 591 ccw_device_done(cdev, DEV_STATE_BOXED); 592 return 0; 593 } 594 if (ccw_device_is_orphan(cdev)) { 595 ccw_device_done(cdev, DEV_STATE_OFFLINE); 596 return 0; 597 } 598 sch = to_subchannel(cdev->dev.parent); 599 if (cio_update_schib(sch)) 600 return -ENODEV; 601 if (scsw_actl(&sch->schib.scsw) != 0) 602 return -EBUSY; 603 if (cdev->private->state != DEV_STATE_ONLINE) 604 return -EINVAL; 605 /* Are we doing path grouping? */ 606 if (!cdev->private->flags.pgroup) { 607 /* No, set state offline immediately. */ 608 ccw_device_done(cdev, DEV_STATE_OFFLINE); 609 return 0; 610 } 611 /* Start Set Path Group commands. */ 612 cdev->private->state = DEV_STATE_DISBAND_PGID; 613 ccw_device_disband_start(cdev); 614 return 0; 615 } 616 617 /* 618 * Handle not operational event in non-special state. 619 */ 620 static void ccw_device_generic_notoper(struct ccw_device *cdev, 621 enum dev_event dev_event) 622 { 623 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) 624 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 625 else 626 ccw_device_set_disconnected(cdev); 627 } 628 629 /* 630 * Handle path verification event in offline state. 631 */ 632 static void ccw_device_offline_verify(struct ccw_device *cdev, 633 enum dev_event dev_event) 634 { 635 struct subchannel *sch = to_subchannel(cdev->dev.parent); 636 637 css_schedule_eval(sch->schid); 638 } 639 640 /* 641 * Handle path verification event. 642 */ 643 static void 644 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) 645 { 646 struct subchannel *sch; 647 648 if (cdev->private->state == DEV_STATE_W4SENSE) { 649 cdev->private->flags.doverify = 1; 650 return; 651 } 652 sch = to_subchannel(cdev->dev.parent); 653 /* 654 * Since we might not just be coming from an interrupt from the 655 * subchannel we have to update the schib. 656 */ 657 if (cio_update_schib(sch)) { 658 ccw_device_verify_done(cdev, -ENODEV); 659 return; 660 } 661 662 if (scsw_actl(&sch->schib.scsw) != 0 || 663 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || 664 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { 665 /* 666 * No final status yet or final status not yet delivered 667 * to the device driver. Can't do path verification now, 668 * delay until final status was delivered. 669 */ 670 cdev->private->flags.doverify = 1; 671 return; 672 } 673 /* Device is idle, we can do the path verification. */ 674 cdev->private->state = DEV_STATE_VERIFY; 675 ccw_device_verify_start(cdev); 676 } 677 678 /* 679 * Handle path verification event in boxed state. 680 */ 681 static void ccw_device_boxed_verify(struct ccw_device *cdev, 682 enum dev_event dev_event) 683 { 684 struct subchannel *sch = to_subchannel(cdev->dev.parent); 685 686 if (cdev->online) { 687 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) 688 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 689 else 690 ccw_device_online_verify(cdev, dev_event); 691 } else 692 css_schedule_eval(sch->schid); 693 } 694 695 /* 696 * Pass interrupt to device driver. 697 */ 698 static int ccw_device_call_handler(struct ccw_device *cdev) 699 { 700 unsigned int stctl; 701 int ending_status; 702 703 /* 704 * we allow for the device action handler if . 705 * - we received ending status 706 * - the action handler requested to see all interrupts 707 * - we received an intermediate status 708 * - fast notification was requested (primary status) 709 * - unsolicited interrupts 710 */ 711 stctl = scsw_stctl(&cdev->private->irb.scsw); 712 ending_status = (stctl & SCSW_STCTL_SEC_STATUS) || 713 (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) || 714 (stctl == SCSW_STCTL_STATUS_PEND); 715 if (!ending_status && 716 !cdev->private->options.repall && 717 !(stctl & SCSW_STCTL_INTER_STATUS) && 718 !(cdev->private->options.fast && 719 (stctl & SCSW_STCTL_PRIM_STATUS))) 720 return 0; 721 722 if (ending_status) 723 ccw_device_set_timeout(cdev, 0); 724 725 if (cdev->handler) 726 cdev->handler(cdev, cdev->private->intparm, 727 &cdev->private->irb); 728 729 memset(&cdev->private->irb, 0, sizeof(struct irb)); 730 return 1; 731 } 732 733 /* 734 * Got an interrupt for a normal io (state online). 735 */ 736 static void 737 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) 738 { 739 struct irb *irb; 740 int is_cmd; 741 742 irb = this_cpu_ptr(&cio_irb); 743 is_cmd = !scsw_is_tm(&irb->scsw); 744 /* Check for unsolicited interrupt. */ 745 if (!scsw_is_solicited(&irb->scsw)) { 746 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && 747 !irb->esw.esw0.erw.cons) { 748 /* Unit check but no sense data. Need basic sense. */ 749 if (ccw_device_do_sense(cdev, irb) != 0) 750 goto call_handler_unsol; 751 memcpy(&cdev->private->irb, irb, sizeof(struct irb)); 752 cdev->private->state = DEV_STATE_W4SENSE; 753 cdev->private->intparm = 0; 754 return; 755 } 756 call_handler_unsol: 757 if (cdev->handler) 758 cdev->handler (cdev, 0, irb); 759 if (cdev->private->flags.doverify) 760 ccw_device_online_verify(cdev, 0); 761 return; 762 } 763 /* Accumulate status and find out if a basic sense is needed. */ 764 ccw_device_accumulate_irb(cdev, irb); 765 if (is_cmd && cdev->private->flags.dosense) { 766 if (ccw_device_do_sense(cdev, irb) == 0) { 767 cdev->private->state = DEV_STATE_W4SENSE; 768 } 769 return; 770 } 771 /* Call the handler. */ 772 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 773 /* Start delayed path verification. */ 774 ccw_device_online_verify(cdev, 0); 775 } 776 777 /* 778 * Got an timeout in online state. 779 */ 780 static void 781 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) 782 { 783 int ret; 784 785 ccw_device_set_timeout(cdev, 0); 786 cdev->private->iretry = 255; 787 ret = ccw_device_cancel_halt_clear(cdev); 788 if (ret == -EBUSY) { 789 ccw_device_set_timeout(cdev, 3*HZ); 790 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 791 return; 792 } 793 if (ret) 794 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 795 else if (cdev->handler) 796 cdev->handler(cdev, cdev->private->intparm, 797 ERR_PTR(-ETIMEDOUT)); 798 } 799 800 /* 801 * Got an interrupt for a basic sense. 802 */ 803 static void 804 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) 805 { 806 struct irb *irb; 807 808 irb = this_cpu_ptr(&cio_irb); 809 /* Check for unsolicited interrupt. */ 810 if (scsw_stctl(&irb->scsw) == 811 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { 812 if (scsw_cc(&irb->scsw) == 1) 813 /* Basic sense hasn't started. Try again. */ 814 ccw_device_do_sense(cdev, irb); 815 else { 816 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " 817 "interrupt during w4sense...\n", 818 cdev->private->dev_id.ssid, 819 cdev->private->dev_id.devno); 820 if (cdev->handler) 821 cdev->handler (cdev, 0, irb); 822 } 823 return; 824 } 825 /* 826 * Check if a halt or clear has been issued in the meanwhile. If yes, 827 * only deliver the halt/clear interrupt to the device driver as if it 828 * had killed the original request. 829 */ 830 if (scsw_fctl(&irb->scsw) & 831 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { 832 cdev->private->flags.dosense = 0; 833 memset(&cdev->private->irb, 0, sizeof(struct irb)); 834 ccw_device_accumulate_irb(cdev, irb); 835 goto call_handler; 836 } 837 /* Add basic sense info to irb. */ 838 ccw_device_accumulate_basic_sense(cdev, irb); 839 if (cdev->private->flags.dosense) { 840 /* Another basic sense is needed. */ 841 ccw_device_do_sense(cdev, irb); 842 return; 843 } 844 call_handler: 845 cdev->private->state = DEV_STATE_ONLINE; 846 /* In case sensing interfered with setting the device online */ 847 wake_up(&cdev->private->wait_q); 848 /* Call the handler. */ 849 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 850 /* Start delayed path verification. */ 851 ccw_device_online_verify(cdev, 0); 852 } 853 854 static void 855 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) 856 { 857 ccw_device_set_timeout(cdev, 0); 858 /* Start delayed path verification. */ 859 ccw_device_online_verify(cdev, 0); 860 /* OK, i/o is dead now. Call interrupt handler. */ 861 if (cdev->handler) 862 cdev->handler(cdev, cdev->private->intparm, 863 ERR_PTR(-EIO)); 864 } 865 866 static void 867 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) 868 { 869 int ret; 870 871 ret = ccw_device_cancel_halt_clear(cdev); 872 if (ret == -EBUSY) { 873 ccw_device_set_timeout(cdev, 3*HZ); 874 return; 875 } 876 /* Start delayed path verification. */ 877 ccw_device_online_verify(cdev, 0); 878 if (cdev->handler) 879 cdev->handler(cdev, cdev->private->intparm, 880 ERR_PTR(-EIO)); 881 } 882 883 void ccw_device_kill_io(struct ccw_device *cdev) 884 { 885 int ret; 886 887 cdev->private->iretry = 255; 888 ret = ccw_device_cancel_halt_clear(cdev); 889 if (ret == -EBUSY) { 890 ccw_device_set_timeout(cdev, 3*HZ); 891 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 892 return; 893 } 894 /* Start delayed path verification. */ 895 ccw_device_online_verify(cdev, 0); 896 if (cdev->handler) 897 cdev->handler(cdev, cdev->private->intparm, 898 ERR_PTR(-EIO)); 899 } 900 901 static void 902 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) 903 { 904 /* Start verification after current task finished. */ 905 cdev->private->flags.doverify = 1; 906 } 907 908 static void 909 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) 910 { 911 struct subchannel *sch; 912 913 sch = to_subchannel(cdev->dev.parent); 914 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) 915 /* Couldn't enable the subchannel for i/o. Sick device. */ 916 return; 917 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; 918 ccw_device_sense_id_start(cdev); 919 } 920 921 void ccw_device_trigger_reprobe(struct ccw_device *cdev) 922 { 923 struct subchannel *sch; 924 925 if (cdev->private->state != DEV_STATE_DISCONNECTED) 926 return; 927 928 sch = to_subchannel(cdev->dev.parent); 929 /* Update some values. */ 930 if (cio_update_schib(sch)) 931 return; 932 /* 933 * The pim, pam, pom values may not be accurate, but they are the best 934 * we have before performing device selection :/ 935 */ 936 sch->lpm = sch->schib.pmcw.pam & sch->opm; 937 /* 938 * Use the initial configuration since we can't be shure that the old 939 * paths are valid. 940 */ 941 io_subchannel_init_config(sch); 942 if (cio_commit_config(sch)) 943 return; 944 945 /* We should also udate ssd info, but this has to wait. */ 946 /* Check if this is another device which appeared on the same sch. */ 947 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) 948 css_schedule_eval(sch->schid); 949 else 950 ccw_device_start_id(cdev, 0); 951 } 952 953 static void ccw_device_disabled_irq(struct ccw_device *cdev, 954 enum dev_event dev_event) 955 { 956 struct subchannel *sch; 957 958 sch = to_subchannel(cdev->dev.parent); 959 /* 960 * An interrupt in a disabled state means a previous disable was not 961 * successful - should not happen, but we try to disable again. 962 */ 963 cio_disable_subchannel(sch); 964 } 965 966 static void 967 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) 968 { 969 retry_set_schib(cdev); 970 cdev->private->state = DEV_STATE_ONLINE; 971 dev_fsm_event(cdev, dev_event); 972 } 973 974 static void ccw_device_update_cmfblock(struct ccw_device *cdev, 975 enum dev_event dev_event) 976 { 977 cmf_retry_copy_block(cdev); 978 cdev->private->state = DEV_STATE_ONLINE; 979 dev_fsm_event(cdev, dev_event); 980 } 981 982 static void 983 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) 984 { 985 ccw_device_set_timeout(cdev, 0); 986 cdev->private->state = DEV_STATE_NOT_OPER; 987 wake_up(&cdev->private->wait_q); 988 } 989 990 static void 991 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) 992 { 993 int ret; 994 995 ret = ccw_device_cancel_halt_clear(cdev); 996 if (ret == -EBUSY) { 997 ccw_device_set_timeout(cdev, HZ/10); 998 } else { 999 cdev->private->state = DEV_STATE_NOT_OPER; 1000 wake_up(&cdev->private->wait_q); 1001 } 1002 } 1003 1004 /* 1005 * No operation action. This is used e.g. to ignore a timeout event in 1006 * state offline. 1007 */ 1008 static void 1009 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) 1010 { 1011 } 1012 1013 /* 1014 * device statemachine 1015 */ 1016 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { 1017 [DEV_STATE_NOT_OPER] = { 1018 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1019 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 1020 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1021 [DEV_EVENT_VERIFY] = ccw_device_nop, 1022 }, 1023 [DEV_STATE_SENSE_ID] = { 1024 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1025 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1026 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1027 [DEV_EVENT_VERIFY] = ccw_device_nop, 1028 }, 1029 [DEV_STATE_OFFLINE] = { 1030 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1031 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 1032 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1033 [DEV_EVENT_VERIFY] = ccw_device_offline_verify, 1034 }, 1035 [DEV_STATE_VERIFY] = { 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_delay_verify, 1040 }, 1041 [DEV_STATE_ONLINE] = { 1042 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1043 [DEV_EVENT_INTERRUPT] = ccw_device_irq, 1044 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, 1045 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1046 }, 1047 [DEV_STATE_W4SENSE] = { 1048 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1049 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, 1050 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1051 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1052 }, 1053 [DEV_STATE_DISBAND_PGID] = { 1054 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1055 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1056 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1057 [DEV_EVENT_VERIFY] = ccw_device_nop, 1058 }, 1059 [DEV_STATE_BOXED] = { 1060 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1061 [DEV_EVENT_INTERRUPT] = ccw_device_nop, 1062 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1063 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify, 1064 }, 1065 /* states to wait for i/o completion before doing something */ 1066 [DEV_STATE_TIMEOUT_KILL] = { 1067 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1068 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, 1069 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, 1070 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME 1071 }, 1072 [DEV_STATE_QUIESCE] = { 1073 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, 1074 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, 1075 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, 1076 [DEV_EVENT_VERIFY] = ccw_device_nop, 1077 }, 1078 /* special states for devices gone not operational */ 1079 [DEV_STATE_DISCONNECTED] = { 1080 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1081 [DEV_EVENT_INTERRUPT] = ccw_device_start_id, 1082 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1083 [DEV_EVENT_VERIFY] = ccw_device_start_id, 1084 }, 1085 [DEV_STATE_DISCONNECTED_SENSE_ID] = { 1086 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1087 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1088 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1089 [DEV_EVENT_VERIFY] = ccw_device_nop, 1090 }, 1091 [DEV_STATE_CMFCHANGE] = { 1092 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, 1093 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, 1094 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, 1095 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, 1096 }, 1097 [DEV_STATE_CMFUPDATE] = { 1098 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, 1099 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, 1100 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, 1101 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, 1102 }, 1103 [DEV_STATE_STEAL_LOCK] = { 1104 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1105 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1106 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1107 [DEV_EVENT_VERIFY] = ccw_device_nop, 1108 }, 1109 }; 1110 1111 EXPORT_SYMBOL_GPL(ccw_device_set_timeout); 1112