1 /* 2 * drivers/s390/cio/device_fsm.c 3 * finite state machine for device handling 4 * 5 * Copyright IBM Corp. 2002,2008 6 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 */ 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/jiffies.h> 13 #include <linux/string.h> 14 15 #include <asm/ccwdev.h> 16 #include <asm/cio.h> 17 #include <asm/chpid.h> 18 19 #include "cio.h" 20 #include "cio_debug.h" 21 #include "css.h" 22 #include "device.h" 23 #include "chsc.h" 24 #include "ioasm.h" 25 #include "chp.h" 26 27 static int timeout_log_enabled; 28 29 static int __init ccw_timeout_log_setup(char *unused) 30 { 31 timeout_log_enabled = 1; 32 return 1; 33 } 34 35 __setup("ccw_timeout_log", ccw_timeout_log_setup); 36 37 static void ccw_timeout_log(struct ccw_device *cdev) 38 { 39 struct schib schib; 40 struct subchannel *sch; 41 struct io_subchannel_private *private; 42 union orb *orb; 43 int cc; 44 45 sch = to_subchannel(cdev->dev.parent); 46 private = to_io_private(sch); 47 orb = &private->orb; 48 cc = stsch_err(sch->schid, &schib); 49 50 printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, " 51 "device information:\n", get_clock()); 52 printk(KERN_WARNING "cio: orb:\n"); 53 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 54 orb, sizeof(*orb), 0); 55 printk(KERN_WARNING "cio: ccw device bus id: %s\n", 56 dev_name(&cdev->dev)); 57 printk(KERN_WARNING "cio: subchannel bus id: %s\n", 58 dev_name(&sch->dev)); 59 printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, " 60 "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm); 61 62 if (orb->tm.b) { 63 printk(KERN_WARNING "cio: orb indicates transport mode\n"); 64 printk(KERN_WARNING "cio: last tcw:\n"); 65 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 66 (void *)(addr_t)orb->tm.tcw, 67 sizeof(struct tcw), 0); 68 } else { 69 printk(KERN_WARNING "cio: orb indicates command mode\n"); 70 if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw || 71 (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws) 72 printk(KERN_WARNING "cio: last channel program " 73 "(intern):\n"); 74 else 75 printk(KERN_WARNING "cio: last channel program:\n"); 76 77 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 78 (void *)(addr_t)orb->cmd.cpa, 79 sizeof(struct ccw1), 0); 80 } 81 printk(KERN_WARNING "cio: ccw device state: %d\n", 82 cdev->private->state); 83 printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc); 84 printk(KERN_WARNING "cio: schib:\n"); 85 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 86 &schib, sizeof(schib), 0); 87 printk(KERN_WARNING "cio: ccw device flags:\n"); 88 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, 89 &cdev->private->flags, sizeof(cdev->private->flags), 0); 90 } 91 92 /* 93 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. 94 */ 95 static void 96 ccw_device_timeout(unsigned long data) 97 { 98 struct ccw_device *cdev; 99 100 cdev = (struct ccw_device *) data; 101 spin_lock_irq(cdev->ccwlock); 102 if (timeout_log_enabled) 103 ccw_timeout_log(cdev); 104 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); 105 spin_unlock_irq(cdev->ccwlock); 106 } 107 108 /* 109 * Set timeout 110 */ 111 void 112 ccw_device_set_timeout(struct ccw_device *cdev, int expires) 113 { 114 if (expires == 0) { 115 del_timer(&cdev->private->timer); 116 return; 117 } 118 if (timer_pending(&cdev->private->timer)) { 119 if (mod_timer(&cdev->private->timer, jiffies + expires)) 120 return; 121 } 122 cdev->private->timer.function = ccw_device_timeout; 123 cdev->private->timer.data = (unsigned long) cdev; 124 cdev->private->timer.expires = jiffies + expires; 125 add_timer(&cdev->private->timer); 126 } 127 128 /* 129 * Cancel running i/o. This is called repeatedly since halt/clear are 130 * asynchronous operations. We do one try with cio_cancel, two tries 131 * with cio_halt, 255 tries with cio_clear. If everythings fails panic. 132 * Returns 0 if device now idle, -ENODEV for device not operational and 133 * -EBUSY if an interrupt is expected (either from halt/clear or from a 134 * status pending). 135 */ 136 int 137 ccw_device_cancel_halt_clear(struct ccw_device *cdev) 138 { 139 struct subchannel *sch; 140 int ret; 141 142 sch = to_subchannel(cdev->dev.parent); 143 if (cio_update_schib(sch)) 144 return -ENODEV; 145 if (!sch->schib.pmcw.ena) 146 /* Not operational -> done. */ 147 return 0; 148 /* Stage 1: cancel io. */ 149 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) && 150 !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { 151 if (!scsw_is_tm(&sch->schib.scsw)) { 152 ret = cio_cancel(sch); 153 if (ret != -EINVAL) 154 return ret; 155 } 156 /* cancel io unsuccessful or not applicable (transport mode). 157 * Continue with asynchronous instructions. */ 158 cdev->private->iretry = 3; /* 3 halt retries. */ 159 } 160 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { 161 /* Stage 2: halt io. */ 162 if (cdev->private->iretry) { 163 cdev->private->iretry--; 164 ret = cio_halt(sch); 165 if (ret != -EBUSY) 166 return (ret == 0) ? -EBUSY : ret; 167 } 168 /* halt io unsuccessful. */ 169 cdev->private->iretry = 255; /* 255 clear retries. */ 170 } 171 /* Stage 3: clear io. */ 172 if (cdev->private->iretry) { 173 cdev->private->iretry--; 174 ret = cio_clear (sch); 175 return (ret == 0) ? -EBUSY : ret; 176 } 177 /* Function was unsuccessful */ 178 CIO_MSG_EVENT(0, "0.%x.%04x: could not stop I/O\n", 179 cdev->private->dev_id.ssid, cdev->private->dev_id.devno); 180 return -EIO; 181 } 182 183 void ccw_device_update_sense_data(struct ccw_device *cdev) 184 { 185 memset(&cdev->id, 0, sizeof(cdev->id)); 186 cdev->id.cu_type = cdev->private->senseid.cu_type; 187 cdev->id.cu_model = cdev->private->senseid.cu_model; 188 cdev->id.dev_type = cdev->private->senseid.dev_type; 189 cdev->id.dev_model = cdev->private->senseid.dev_model; 190 } 191 192 int ccw_device_test_sense_data(struct ccw_device *cdev) 193 { 194 return cdev->id.cu_type == cdev->private->senseid.cu_type && 195 cdev->id.cu_model == cdev->private->senseid.cu_model && 196 cdev->id.dev_type == cdev->private->senseid.dev_type && 197 cdev->id.dev_model == cdev->private->senseid.dev_model; 198 } 199 200 /* 201 * The machine won't give us any notification by machine check if a chpid has 202 * been varied online on the SE so we have to find out by magic (i. e. driving 203 * the channel subsystem to device selection and updating our path masks). 204 */ 205 static void 206 __recover_lost_chpids(struct subchannel *sch, int old_lpm) 207 { 208 int mask, i; 209 struct chp_id chpid; 210 211 chp_id_init(&chpid); 212 for (i = 0; i<8; i++) { 213 mask = 0x80 >> i; 214 if (!(sch->lpm & mask)) 215 continue; 216 if (old_lpm & mask) 217 continue; 218 chpid.id = sch->schib.pmcw.chpid[i]; 219 if (!chp_is_registered(chpid)) 220 css_schedule_eval_all(); 221 } 222 } 223 224 /* 225 * Stop device recognition. 226 */ 227 static void 228 ccw_device_recog_done(struct ccw_device *cdev, int state) 229 { 230 struct subchannel *sch; 231 int old_lpm; 232 233 sch = to_subchannel(cdev->dev.parent); 234 235 if (cio_disable_subchannel(sch)) 236 state = DEV_STATE_NOT_OPER; 237 /* 238 * Now that we tried recognition, we have performed device selection 239 * through ssch() and the path information is up to date. 240 */ 241 old_lpm = sch->lpm; 242 243 /* Check since device may again have become not operational. */ 244 if (cio_update_schib(sch)) 245 state = DEV_STATE_NOT_OPER; 246 else 247 sch->lpm = sch->schib.pmcw.pam & sch->opm; 248 249 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) 250 /* Force reprobe on all chpids. */ 251 old_lpm = 0; 252 if (sch->lpm != old_lpm) 253 __recover_lost_chpids(sch, old_lpm); 254 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID && 255 (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) { 256 cdev->private->flags.recog_done = 1; 257 cdev->private->state = DEV_STATE_DISCONNECTED; 258 wake_up(&cdev->private->wait_q); 259 return; 260 } 261 if (cdev->private->flags.resuming) { 262 cdev->private->state = state; 263 cdev->private->flags.recog_done = 1; 264 wake_up(&cdev->private->wait_q); 265 return; 266 } 267 switch (state) { 268 case DEV_STATE_NOT_OPER: 269 break; 270 case DEV_STATE_OFFLINE: 271 if (!cdev->online) { 272 ccw_device_update_sense_data(cdev); 273 break; 274 } 275 cdev->private->state = DEV_STATE_OFFLINE; 276 cdev->private->flags.recog_done = 1; 277 if (ccw_device_test_sense_data(cdev)) { 278 cdev->private->flags.donotify = 1; 279 ccw_device_online(cdev); 280 wake_up(&cdev->private->wait_q); 281 } else { 282 ccw_device_update_sense_data(cdev); 283 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); 284 } 285 return; 286 case DEV_STATE_BOXED: 287 if (cdev->id.cu_type != 0) { /* device was recognized before */ 288 cdev->private->flags.recog_done = 1; 289 cdev->private->state = DEV_STATE_BOXED; 290 wake_up(&cdev->private->wait_q); 291 return; 292 } 293 break; 294 } 295 cdev->private->state = state; 296 io_subchannel_recog_done(cdev); 297 wake_up(&cdev->private->wait_q); 298 } 299 300 /* 301 * Function called from device_id.c after sense id has completed. 302 */ 303 void 304 ccw_device_sense_id_done(struct ccw_device *cdev, int err) 305 { 306 switch (err) { 307 case 0: 308 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); 309 break; 310 case -ETIME: /* Sense id stopped by timeout. */ 311 ccw_device_recog_done(cdev, DEV_STATE_BOXED); 312 break; 313 default: 314 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); 315 break; 316 } 317 } 318 319 /** 320 * ccw_device_notify() - inform the device's driver about an event 321 * @cdev: device for which an event occurred 322 * @event: event that occurred 323 * 324 * Returns: 325 * -%EINVAL if the device is offline or has no driver. 326 * -%EOPNOTSUPP if the device's driver has no notifier registered. 327 * %NOTIFY_OK if the driver wants to keep the device. 328 * %NOTIFY_BAD if the driver doesn't want to keep the device. 329 */ 330 int ccw_device_notify(struct ccw_device *cdev, int event) 331 { 332 int ret = -EINVAL; 333 334 if (!cdev->drv) 335 goto out; 336 if (!cdev->online) 337 goto out; 338 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", 339 cdev->private->dev_id.ssid, cdev->private->dev_id.devno, 340 event); 341 if (!cdev->drv->notify) { 342 ret = -EOPNOTSUPP; 343 goto out; 344 } 345 if (cdev->drv->notify(cdev, event)) 346 ret = NOTIFY_OK; 347 else 348 ret = NOTIFY_BAD; 349 out: 350 return ret; 351 } 352 353 static void ccw_device_oper_notify(struct ccw_device *cdev) 354 { 355 struct subchannel *sch = to_subchannel(cdev->dev.parent); 356 357 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) { 358 /* Reenable channel measurements, if needed. */ 359 ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF); 360 /* Save indication for new paths. */ 361 cdev->private->path_new_mask = sch->vpm; 362 return; 363 } 364 /* Driver doesn't want device back. */ 365 ccw_device_set_notoper(cdev); 366 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); 367 } 368 369 /* 370 * Finished with online/offline processing. 371 */ 372 static void 373 ccw_device_done(struct ccw_device *cdev, int state) 374 { 375 struct subchannel *sch; 376 377 sch = to_subchannel(cdev->dev.parent); 378 379 ccw_device_set_timeout(cdev, 0); 380 381 if (state != DEV_STATE_ONLINE) 382 cio_disable_subchannel(sch); 383 384 /* Reset device status. */ 385 memset(&cdev->private->irb, 0, sizeof(struct irb)); 386 387 cdev->private->state = state; 388 389 switch (state) { 390 case DEV_STATE_BOXED: 391 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", 392 cdev->private->dev_id.devno, sch->schid.sch_no); 393 if (cdev->online && 394 ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK) 395 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 396 cdev->private->flags.donotify = 0; 397 break; 398 case DEV_STATE_NOT_OPER: 399 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n", 400 cdev->private->dev_id.devno, sch->schid.sch_no); 401 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) 402 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 403 else 404 ccw_device_set_disconnected(cdev); 405 cdev->private->flags.donotify = 0; 406 break; 407 case DEV_STATE_DISCONNECTED: 408 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel " 409 "%04x\n", cdev->private->dev_id.devno, 410 sch->schid.sch_no); 411 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) { 412 cdev->private->state = DEV_STATE_NOT_OPER; 413 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 414 } else 415 ccw_device_set_disconnected(cdev); 416 cdev->private->flags.donotify = 0; 417 break; 418 default: 419 break; 420 } 421 422 if (cdev->private->flags.donotify) { 423 cdev->private->flags.donotify = 0; 424 ccw_device_oper_notify(cdev); 425 } 426 wake_up(&cdev->private->wait_q); 427 } 428 429 /* 430 * Start device recognition. 431 */ 432 void ccw_device_recognition(struct ccw_device *cdev) 433 { 434 struct subchannel *sch = to_subchannel(cdev->dev.parent); 435 436 /* 437 * We used to start here with a sense pgid to find out whether a device 438 * is locked by someone else. Unfortunately, the sense pgid command 439 * code has other meanings on devices predating the path grouping 440 * algorithm, so we start with sense id and box the device after an 441 * timeout (or if sense pgid during path verification detects the device 442 * is locked, as may happen on newer devices). 443 */ 444 cdev->private->flags.recog_done = 0; 445 cdev->private->state = DEV_STATE_SENSE_ID; 446 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) { 447 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); 448 return; 449 } 450 ccw_device_sense_id_start(cdev); 451 } 452 453 /* 454 * Handle events for states that use the ccw request infrastructure. 455 */ 456 static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e) 457 { 458 switch (e) { 459 case DEV_EVENT_NOTOPER: 460 ccw_request_notoper(cdev); 461 break; 462 case DEV_EVENT_INTERRUPT: 463 ccw_request_handler(cdev); 464 break; 465 case DEV_EVENT_TIMEOUT: 466 ccw_request_timeout(cdev); 467 break; 468 default: 469 break; 470 } 471 } 472 473 static void ccw_device_report_path_events(struct ccw_device *cdev) 474 { 475 struct subchannel *sch = to_subchannel(cdev->dev.parent); 476 int path_event[8]; 477 int chp, mask; 478 479 for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) { 480 path_event[chp] = PE_NONE; 481 if (mask & cdev->private->path_gone_mask & ~(sch->vpm)) 482 path_event[chp] |= PE_PATH_GONE; 483 if (mask & cdev->private->path_new_mask & sch->vpm) 484 path_event[chp] |= PE_PATH_AVAILABLE; 485 if (mask & cdev->private->pgid_reset_mask & sch->vpm) 486 path_event[chp] |= PE_PATHGROUP_ESTABLISHED; 487 } 488 if (cdev->online && cdev->drv->path_event) 489 cdev->drv->path_event(cdev, path_event); 490 } 491 492 static void ccw_device_reset_path_events(struct ccw_device *cdev) 493 { 494 cdev->private->path_gone_mask = 0; 495 cdev->private->path_new_mask = 0; 496 cdev->private->pgid_reset_mask = 0; 497 } 498 499 static void create_fake_irb(struct irb *irb, int type) 500 { 501 memset(irb, 0, sizeof(*irb)); 502 if (type == FAKE_CMD_IRB) { 503 struct cmd_scsw *scsw = &irb->scsw.cmd; 504 scsw->cc = 1; 505 scsw->fctl = SCSW_FCTL_START_FUNC; 506 scsw->actl = SCSW_ACTL_START_PEND; 507 scsw->stctl = SCSW_STCTL_STATUS_PEND; 508 } else if (type == FAKE_TM_IRB) { 509 struct tm_scsw *scsw = &irb->scsw.tm; 510 scsw->x = 1; 511 scsw->cc = 1; 512 scsw->fctl = SCSW_FCTL_START_FUNC; 513 scsw->actl = SCSW_ACTL_START_PEND; 514 scsw->stctl = SCSW_STCTL_STATUS_PEND; 515 } 516 } 517 518 void ccw_device_verify_done(struct ccw_device *cdev, int err) 519 { 520 struct subchannel *sch; 521 522 sch = to_subchannel(cdev->dev.parent); 523 /* Update schib - pom may have changed. */ 524 if (cio_update_schib(sch)) { 525 err = -ENODEV; 526 goto callback; 527 } 528 /* Update lpm with verified path mask. */ 529 sch->lpm = sch->vpm; 530 /* Repeat path verification? */ 531 if (cdev->private->flags.doverify) { 532 ccw_device_verify_start(cdev); 533 return; 534 } 535 callback: 536 switch (err) { 537 case 0: 538 ccw_device_done(cdev, DEV_STATE_ONLINE); 539 /* Deliver fake irb to device driver, if needed. */ 540 if (cdev->private->flags.fake_irb) { 541 create_fake_irb(&cdev->private->irb, 542 cdev->private->flags.fake_irb); 543 cdev->private->flags.fake_irb = 0; 544 if (cdev->handler) 545 cdev->handler(cdev, cdev->private->intparm, 546 &cdev->private->irb); 547 memset(&cdev->private->irb, 0, sizeof(struct irb)); 548 } 549 ccw_device_report_path_events(cdev); 550 break; 551 case -ETIME: 552 case -EUSERS: 553 /* Reset oper notify indication after verify error. */ 554 cdev->private->flags.donotify = 0; 555 ccw_device_done(cdev, DEV_STATE_BOXED); 556 break; 557 case -EACCES: 558 /* Reset oper notify indication after verify error. */ 559 cdev->private->flags.donotify = 0; 560 ccw_device_done(cdev, DEV_STATE_DISCONNECTED); 561 break; 562 default: 563 /* Reset oper notify indication after verify error. */ 564 cdev->private->flags.donotify = 0; 565 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 566 break; 567 } 568 ccw_device_reset_path_events(cdev); 569 } 570 571 /* 572 * Get device online. 573 */ 574 int 575 ccw_device_online(struct ccw_device *cdev) 576 { 577 struct subchannel *sch; 578 int ret; 579 580 if ((cdev->private->state != DEV_STATE_OFFLINE) && 581 (cdev->private->state != DEV_STATE_BOXED)) 582 return -EINVAL; 583 sch = to_subchannel(cdev->dev.parent); 584 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); 585 if (ret != 0) { 586 /* Couldn't enable the subchannel for i/o. Sick device. */ 587 if (ret == -ENODEV) 588 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 589 return ret; 590 } 591 /* Start initial path verification. */ 592 cdev->private->state = DEV_STATE_VERIFY; 593 ccw_device_verify_start(cdev); 594 return 0; 595 } 596 597 void 598 ccw_device_disband_done(struct ccw_device *cdev, int err) 599 { 600 switch (err) { 601 case 0: 602 ccw_device_done(cdev, DEV_STATE_OFFLINE); 603 break; 604 case -ETIME: 605 ccw_device_done(cdev, DEV_STATE_BOXED); 606 break; 607 default: 608 cdev->private->flags.donotify = 0; 609 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 610 break; 611 } 612 } 613 614 /* 615 * Shutdown device. 616 */ 617 int 618 ccw_device_offline(struct ccw_device *cdev) 619 { 620 struct subchannel *sch; 621 622 /* Allow ccw_device_offline while disconnected. */ 623 if (cdev->private->state == DEV_STATE_DISCONNECTED || 624 cdev->private->state == DEV_STATE_NOT_OPER) { 625 cdev->private->flags.donotify = 0; 626 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 627 return 0; 628 } 629 if (cdev->private->state == DEV_STATE_BOXED) { 630 ccw_device_done(cdev, DEV_STATE_BOXED); 631 return 0; 632 } 633 if (ccw_device_is_orphan(cdev)) { 634 ccw_device_done(cdev, DEV_STATE_OFFLINE); 635 return 0; 636 } 637 sch = to_subchannel(cdev->dev.parent); 638 if (cio_update_schib(sch)) 639 return -ENODEV; 640 if (scsw_actl(&sch->schib.scsw) != 0) 641 return -EBUSY; 642 if (cdev->private->state != DEV_STATE_ONLINE) 643 return -EINVAL; 644 /* Are we doing path grouping? */ 645 if (!cdev->private->flags.pgroup) { 646 /* No, set state offline immediately. */ 647 ccw_device_done(cdev, DEV_STATE_OFFLINE); 648 return 0; 649 } 650 /* Start Set Path Group commands. */ 651 cdev->private->state = DEV_STATE_DISBAND_PGID; 652 ccw_device_disband_start(cdev); 653 return 0; 654 } 655 656 /* 657 * Handle not operational event in non-special state. 658 */ 659 static void ccw_device_generic_notoper(struct ccw_device *cdev, 660 enum dev_event dev_event) 661 { 662 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) 663 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 664 else 665 ccw_device_set_disconnected(cdev); 666 } 667 668 /* 669 * Handle path verification event in offline state. 670 */ 671 static void ccw_device_offline_verify(struct ccw_device *cdev, 672 enum dev_event dev_event) 673 { 674 struct subchannel *sch = to_subchannel(cdev->dev.parent); 675 676 css_schedule_eval(sch->schid); 677 } 678 679 /* 680 * Handle path verification event. 681 */ 682 static void 683 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) 684 { 685 struct subchannel *sch; 686 687 if (cdev->private->state == DEV_STATE_W4SENSE) { 688 cdev->private->flags.doverify = 1; 689 return; 690 } 691 sch = to_subchannel(cdev->dev.parent); 692 /* 693 * Since we might not just be coming from an interrupt from the 694 * subchannel we have to update the schib. 695 */ 696 if (cio_update_schib(sch)) { 697 ccw_device_verify_done(cdev, -ENODEV); 698 return; 699 } 700 701 if (scsw_actl(&sch->schib.scsw) != 0 || 702 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || 703 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { 704 /* 705 * No final status yet or final status not yet delivered 706 * to the device driver. Can't do path verification now, 707 * delay until final status was delivered. 708 */ 709 cdev->private->flags.doverify = 1; 710 return; 711 } 712 /* Device is idle, we can do the path verification. */ 713 cdev->private->state = DEV_STATE_VERIFY; 714 ccw_device_verify_start(cdev); 715 } 716 717 /* 718 * Handle path verification event in boxed state. 719 */ 720 static void ccw_device_boxed_verify(struct ccw_device *cdev, 721 enum dev_event dev_event) 722 { 723 struct subchannel *sch = to_subchannel(cdev->dev.parent); 724 725 if (cdev->online) { 726 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) 727 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 728 else 729 ccw_device_online_verify(cdev, dev_event); 730 } else 731 css_schedule_eval(sch->schid); 732 } 733 734 /* 735 * Got an interrupt for a normal io (state online). 736 */ 737 static void 738 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) 739 { 740 struct irb *irb; 741 int is_cmd; 742 743 irb = (struct irb *)&S390_lowcore.irb; 744 is_cmd = !scsw_is_tm(&irb->scsw); 745 /* Check for unsolicited interrupt. */ 746 if (!scsw_is_solicited(&irb->scsw)) { 747 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && 748 !irb->esw.esw0.erw.cons) { 749 /* Unit check but no sense data. Need basic sense. */ 750 if (ccw_device_do_sense(cdev, irb) != 0) 751 goto call_handler_unsol; 752 memcpy(&cdev->private->irb, irb, sizeof(struct irb)); 753 cdev->private->state = DEV_STATE_W4SENSE; 754 cdev->private->intparm = 0; 755 return; 756 } 757 call_handler_unsol: 758 if (cdev->handler) 759 cdev->handler (cdev, 0, irb); 760 if (cdev->private->flags.doverify) 761 ccw_device_online_verify(cdev, 0); 762 return; 763 } 764 /* Accumulate status and find out if a basic sense is needed. */ 765 ccw_device_accumulate_irb(cdev, irb); 766 if (is_cmd && cdev->private->flags.dosense) { 767 if (ccw_device_do_sense(cdev, irb) == 0) { 768 cdev->private->state = DEV_STATE_W4SENSE; 769 } 770 return; 771 } 772 /* Call the handler. */ 773 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 774 /* Start delayed path verification. */ 775 ccw_device_online_verify(cdev, 0); 776 } 777 778 /* 779 * Got an timeout in online state. 780 */ 781 static void 782 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) 783 { 784 int ret; 785 786 ccw_device_set_timeout(cdev, 0); 787 cdev->private->iretry = 255; 788 ret = ccw_device_cancel_halt_clear(cdev); 789 if (ret == -EBUSY) { 790 ccw_device_set_timeout(cdev, 3*HZ); 791 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 792 return; 793 } 794 if (ret) 795 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 796 else if (cdev->handler) 797 cdev->handler(cdev, cdev->private->intparm, 798 ERR_PTR(-ETIMEDOUT)); 799 } 800 801 /* 802 * Got an interrupt for a basic sense. 803 */ 804 static void 805 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) 806 { 807 struct irb *irb; 808 809 irb = (struct irb *)&S390_lowcore.irb; 810 /* Check for unsolicited interrupt. */ 811 if (scsw_stctl(&irb->scsw) == 812 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { 813 if (scsw_cc(&irb->scsw) == 1) 814 /* Basic sense hasn't started. Try again. */ 815 ccw_device_do_sense(cdev, irb); 816 else { 817 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " 818 "interrupt during w4sense...\n", 819 cdev->private->dev_id.ssid, 820 cdev->private->dev_id.devno); 821 if (cdev->handler) 822 cdev->handler (cdev, 0, irb); 823 } 824 return; 825 } 826 /* 827 * Check if a halt or clear has been issued in the meanwhile. If yes, 828 * only deliver the halt/clear interrupt to the device driver as if it 829 * had killed the original request. 830 */ 831 if (scsw_fctl(&irb->scsw) & 832 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { 833 cdev->private->flags.dosense = 0; 834 memset(&cdev->private->irb, 0, sizeof(struct irb)); 835 ccw_device_accumulate_irb(cdev, irb); 836 goto call_handler; 837 } 838 /* Add basic sense info to irb. */ 839 ccw_device_accumulate_basic_sense(cdev, irb); 840 if (cdev->private->flags.dosense) { 841 /* Another basic sense is needed. */ 842 ccw_device_do_sense(cdev, irb); 843 return; 844 } 845 call_handler: 846 cdev->private->state = DEV_STATE_ONLINE; 847 /* In case sensing interfered with setting the device online */ 848 wake_up(&cdev->private->wait_q); 849 /* Call the handler. */ 850 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 851 /* Start delayed path verification. */ 852 ccw_device_online_verify(cdev, 0); 853 } 854 855 static void 856 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) 857 { 858 ccw_device_set_timeout(cdev, 0); 859 /* Start delayed path verification. */ 860 ccw_device_online_verify(cdev, 0); 861 /* OK, i/o is dead now. Call interrupt handler. */ 862 if (cdev->handler) 863 cdev->handler(cdev, cdev->private->intparm, 864 ERR_PTR(-EIO)); 865 } 866 867 static void 868 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) 869 { 870 int ret; 871 872 ret = ccw_device_cancel_halt_clear(cdev); 873 if (ret == -EBUSY) { 874 ccw_device_set_timeout(cdev, 3*HZ); 875 return; 876 } 877 /* Start delayed path verification. */ 878 ccw_device_online_verify(cdev, 0); 879 if (cdev->handler) 880 cdev->handler(cdev, cdev->private->intparm, 881 ERR_PTR(-EIO)); 882 } 883 884 void ccw_device_kill_io(struct ccw_device *cdev) 885 { 886 int ret; 887 888 cdev->private->iretry = 255; 889 ret = ccw_device_cancel_halt_clear(cdev); 890 if (ret == -EBUSY) { 891 ccw_device_set_timeout(cdev, 3*HZ); 892 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 893 return; 894 } 895 /* Start delayed path verification. */ 896 ccw_device_online_verify(cdev, 0); 897 if (cdev->handler) 898 cdev->handler(cdev, cdev->private->intparm, 899 ERR_PTR(-EIO)); 900 } 901 902 static void 903 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) 904 { 905 /* Start verification after current task finished. */ 906 cdev->private->flags.doverify = 1; 907 } 908 909 static void 910 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) 911 { 912 struct subchannel *sch; 913 914 sch = to_subchannel(cdev->dev.parent); 915 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) 916 /* Couldn't enable the subchannel for i/o. Sick device. */ 917 return; 918 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; 919 ccw_device_sense_id_start(cdev); 920 } 921 922 void ccw_device_trigger_reprobe(struct ccw_device *cdev) 923 { 924 struct subchannel *sch; 925 926 if (cdev->private->state != DEV_STATE_DISCONNECTED) 927 return; 928 929 sch = to_subchannel(cdev->dev.parent); 930 /* Update some values. */ 931 if (cio_update_schib(sch)) 932 return; 933 /* 934 * The pim, pam, pom values may not be accurate, but they are the best 935 * we have before performing device selection :/ 936 */ 937 sch->lpm = sch->schib.pmcw.pam & sch->opm; 938 /* 939 * Use the initial configuration since we can't be shure that the old 940 * paths are valid. 941 */ 942 io_subchannel_init_config(sch); 943 if (cio_commit_config(sch)) 944 return; 945 946 /* We should also udate ssd info, but this has to wait. */ 947 /* Check if this is another device which appeared on the same sch. */ 948 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) 949 css_schedule_eval(sch->schid); 950 else 951 ccw_device_start_id(cdev, 0); 952 } 953 954 static void ccw_device_disabled_irq(struct ccw_device *cdev, 955 enum dev_event dev_event) 956 { 957 struct subchannel *sch; 958 959 sch = to_subchannel(cdev->dev.parent); 960 /* 961 * An interrupt in a disabled state means a previous disable was not 962 * successful - should not happen, but we try to disable again. 963 */ 964 cio_disable_subchannel(sch); 965 } 966 967 static void 968 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) 969 { 970 retry_set_schib(cdev); 971 cdev->private->state = DEV_STATE_ONLINE; 972 dev_fsm_event(cdev, dev_event); 973 } 974 975 static void ccw_device_update_cmfblock(struct ccw_device *cdev, 976 enum dev_event dev_event) 977 { 978 cmf_retry_copy_block(cdev); 979 cdev->private->state = DEV_STATE_ONLINE; 980 dev_fsm_event(cdev, dev_event); 981 } 982 983 static void 984 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) 985 { 986 ccw_device_set_timeout(cdev, 0); 987 cdev->private->state = DEV_STATE_NOT_OPER; 988 wake_up(&cdev->private->wait_q); 989 } 990 991 static void 992 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) 993 { 994 int ret; 995 996 ret = ccw_device_cancel_halt_clear(cdev); 997 if (ret == -EBUSY) { 998 ccw_device_set_timeout(cdev, HZ/10); 999 } else { 1000 cdev->private->state = DEV_STATE_NOT_OPER; 1001 wake_up(&cdev->private->wait_q); 1002 } 1003 } 1004 1005 /* 1006 * No operation action. This is used e.g. to ignore a timeout event in 1007 * state offline. 1008 */ 1009 static void 1010 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) 1011 { 1012 } 1013 1014 /* 1015 * device statemachine 1016 */ 1017 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { 1018 [DEV_STATE_NOT_OPER] = { 1019 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1020 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 1021 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1022 [DEV_EVENT_VERIFY] = ccw_device_nop, 1023 }, 1024 [DEV_STATE_SENSE_PGID] = { 1025 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1026 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1027 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1028 [DEV_EVENT_VERIFY] = ccw_device_nop, 1029 }, 1030 [DEV_STATE_SENSE_ID] = { 1031 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1032 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1033 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1034 [DEV_EVENT_VERIFY] = ccw_device_nop, 1035 }, 1036 [DEV_STATE_OFFLINE] = { 1037 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1038 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 1039 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1040 [DEV_EVENT_VERIFY] = ccw_device_offline_verify, 1041 }, 1042 [DEV_STATE_VERIFY] = { 1043 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1044 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1045 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1046 [DEV_EVENT_VERIFY] = ccw_device_delay_verify, 1047 }, 1048 [DEV_STATE_ONLINE] = { 1049 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1050 [DEV_EVENT_INTERRUPT] = ccw_device_irq, 1051 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, 1052 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1053 }, 1054 [DEV_STATE_W4SENSE] = { 1055 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1056 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, 1057 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1058 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1059 }, 1060 [DEV_STATE_DISBAND_PGID] = { 1061 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1062 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1063 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1064 [DEV_EVENT_VERIFY] = ccw_device_nop, 1065 }, 1066 [DEV_STATE_BOXED] = { 1067 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1068 [DEV_EVENT_INTERRUPT] = ccw_device_nop, 1069 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1070 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify, 1071 }, 1072 /* states to wait for i/o completion before doing something */ 1073 [DEV_STATE_TIMEOUT_KILL] = { 1074 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1075 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, 1076 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, 1077 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME 1078 }, 1079 [DEV_STATE_QUIESCE] = { 1080 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, 1081 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, 1082 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, 1083 [DEV_EVENT_VERIFY] = ccw_device_nop, 1084 }, 1085 /* special states for devices gone not operational */ 1086 [DEV_STATE_DISCONNECTED] = { 1087 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1088 [DEV_EVENT_INTERRUPT] = ccw_device_start_id, 1089 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1090 [DEV_EVENT_VERIFY] = ccw_device_start_id, 1091 }, 1092 [DEV_STATE_DISCONNECTED_SENSE_ID] = { 1093 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1094 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1095 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1096 [DEV_EVENT_VERIFY] = ccw_device_nop, 1097 }, 1098 [DEV_STATE_CMFCHANGE] = { 1099 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, 1100 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, 1101 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, 1102 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, 1103 }, 1104 [DEV_STATE_CMFUPDATE] = { 1105 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, 1106 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, 1107 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, 1108 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, 1109 }, 1110 [DEV_STATE_STEAL_LOCK] = { 1111 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1112 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1113 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1114 [DEV_EVENT_VERIFY] = ccw_device_nop, 1115 }, 1116 }; 1117 1118 EXPORT_SYMBOL_GPL(ccw_device_set_timeout); 1119