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 occured 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 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 413 else 414 ccw_device_set_disconnected(cdev); 415 cdev->private->flags.donotify = 0; 416 break; 417 default: 418 break; 419 } 420 421 if (cdev->private->flags.donotify) { 422 cdev->private->flags.donotify = 0; 423 ccw_device_oper_notify(cdev); 424 } 425 wake_up(&cdev->private->wait_q); 426 } 427 428 /* 429 * Start device recognition. 430 */ 431 void ccw_device_recognition(struct ccw_device *cdev) 432 { 433 struct subchannel *sch = to_subchannel(cdev->dev.parent); 434 435 /* 436 * We used to start here with a sense pgid to find out whether a device 437 * is locked by someone else. Unfortunately, the sense pgid command 438 * code has other meanings on devices predating the path grouping 439 * algorithm, so we start with sense id and box the device after an 440 * timeout (or if sense pgid during path verification detects the device 441 * is locked, as may happen on newer devices). 442 */ 443 cdev->private->flags.recog_done = 0; 444 cdev->private->state = DEV_STATE_SENSE_ID; 445 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) { 446 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); 447 return; 448 } 449 ccw_device_sense_id_start(cdev); 450 } 451 452 /* 453 * Handle events for states that use the ccw request infrastructure. 454 */ 455 static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e) 456 { 457 switch (e) { 458 case DEV_EVENT_NOTOPER: 459 ccw_request_notoper(cdev); 460 break; 461 case DEV_EVENT_INTERRUPT: 462 ccw_request_handler(cdev); 463 break; 464 case DEV_EVENT_TIMEOUT: 465 ccw_request_timeout(cdev); 466 break; 467 default: 468 break; 469 } 470 } 471 472 static void ccw_device_report_path_events(struct ccw_device *cdev) 473 { 474 struct subchannel *sch = to_subchannel(cdev->dev.parent); 475 int path_event[8]; 476 int chp, mask; 477 478 for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) { 479 path_event[chp] = PE_NONE; 480 if (mask & cdev->private->path_gone_mask & ~(sch->vpm)) 481 path_event[chp] |= PE_PATH_GONE; 482 if (mask & cdev->private->path_new_mask & sch->vpm) 483 path_event[chp] |= PE_PATH_AVAILABLE; 484 if (mask & cdev->private->pgid_reset_mask & sch->vpm) 485 path_event[chp] |= PE_PATHGROUP_ESTABLISHED; 486 } 487 if (cdev->online && cdev->drv->path_event) 488 cdev->drv->path_event(cdev, path_event); 489 } 490 491 static void ccw_device_reset_path_events(struct ccw_device *cdev) 492 { 493 cdev->private->path_gone_mask = 0; 494 cdev->private->path_new_mask = 0; 495 cdev->private->pgid_reset_mask = 0; 496 } 497 498 void 499 ccw_device_verify_done(struct ccw_device *cdev, int err) 500 { 501 struct subchannel *sch; 502 503 sch = to_subchannel(cdev->dev.parent); 504 /* Update schib - pom may have changed. */ 505 if (cio_update_schib(sch)) { 506 err = -ENODEV; 507 goto callback; 508 } 509 /* Update lpm with verified path mask. */ 510 sch->lpm = sch->vpm; 511 /* Repeat path verification? */ 512 if (cdev->private->flags.doverify) { 513 ccw_device_verify_start(cdev); 514 return; 515 } 516 callback: 517 switch (err) { 518 case 0: 519 ccw_device_done(cdev, DEV_STATE_ONLINE); 520 /* Deliver fake irb to device driver, if needed. */ 521 if (cdev->private->flags.fake_irb) { 522 memset(&cdev->private->irb, 0, sizeof(struct irb)); 523 cdev->private->irb.scsw.cmd.cc = 1; 524 cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC; 525 cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND; 526 cdev->private->irb.scsw.cmd.stctl = 527 SCSW_STCTL_STATUS_PEND; 528 cdev->private->flags.fake_irb = 0; 529 if (cdev->handler) 530 cdev->handler(cdev, cdev->private->intparm, 531 &cdev->private->irb); 532 memset(&cdev->private->irb, 0, sizeof(struct irb)); 533 } 534 ccw_device_report_path_events(cdev); 535 break; 536 case -ETIME: 537 case -EUSERS: 538 /* Reset oper notify indication after verify error. */ 539 cdev->private->flags.donotify = 0; 540 ccw_device_done(cdev, DEV_STATE_BOXED); 541 break; 542 case -EACCES: 543 /* Reset oper notify indication after verify error. */ 544 cdev->private->flags.donotify = 0; 545 ccw_device_done(cdev, DEV_STATE_DISCONNECTED); 546 break; 547 default: 548 /* Reset oper notify indication after verify error. */ 549 cdev->private->flags.donotify = 0; 550 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 551 break; 552 } 553 ccw_device_reset_path_events(cdev); 554 } 555 556 /* 557 * Get device online. 558 */ 559 int 560 ccw_device_online(struct ccw_device *cdev) 561 { 562 struct subchannel *sch; 563 int ret; 564 565 if ((cdev->private->state != DEV_STATE_OFFLINE) && 566 (cdev->private->state != DEV_STATE_BOXED)) 567 return -EINVAL; 568 sch = to_subchannel(cdev->dev.parent); 569 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); 570 if (ret != 0) { 571 /* Couldn't enable the subchannel for i/o. Sick device. */ 572 if (ret == -ENODEV) 573 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 574 return ret; 575 } 576 /* Start initial path verification. */ 577 cdev->private->state = DEV_STATE_VERIFY; 578 ccw_device_verify_start(cdev); 579 return 0; 580 } 581 582 void 583 ccw_device_disband_done(struct ccw_device *cdev, int err) 584 { 585 switch (err) { 586 case 0: 587 ccw_device_done(cdev, DEV_STATE_OFFLINE); 588 break; 589 case -ETIME: 590 ccw_device_done(cdev, DEV_STATE_BOXED); 591 break; 592 default: 593 cdev->private->flags.donotify = 0; 594 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 595 break; 596 } 597 } 598 599 /* 600 * Shutdown device. 601 */ 602 int 603 ccw_device_offline(struct ccw_device *cdev) 604 { 605 struct subchannel *sch; 606 607 /* Allow ccw_device_offline while disconnected. */ 608 if (cdev->private->state == DEV_STATE_DISCONNECTED || 609 cdev->private->state == DEV_STATE_NOT_OPER) { 610 cdev->private->flags.donotify = 0; 611 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 612 return 0; 613 } 614 if (cdev->private->state == DEV_STATE_BOXED) { 615 ccw_device_done(cdev, DEV_STATE_BOXED); 616 return 0; 617 } 618 if (ccw_device_is_orphan(cdev)) { 619 ccw_device_done(cdev, DEV_STATE_OFFLINE); 620 return 0; 621 } 622 sch = to_subchannel(cdev->dev.parent); 623 if (cio_update_schib(sch)) 624 return -ENODEV; 625 if (scsw_actl(&sch->schib.scsw) != 0) 626 return -EBUSY; 627 if (cdev->private->state != DEV_STATE_ONLINE) 628 return -EINVAL; 629 /* Are we doing path grouping? */ 630 if (!cdev->private->flags.pgroup) { 631 /* No, set state offline immediately. */ 632 ccw_device_done(cdev, DEV_STATE_OFFLINE); 633 return 0; 634 } 635 /* Start Set Path Group commands. */ 636 cdev->private->state = DEV_STATE_DISBAND_PGID; 637 ccw_device_disband_start(cdev); 638 return 0; 639 } 640 641 /* 642 * Handle not operational event in non-special state. 643 */ 644 static void ccw_device_generic_notoper(struct ccw_device *cdev, 645 enum dev_event dev_event) 646 { 647 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) 648 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); 649 else 650 ccw_device_set_disconnected(cdev); 651 } 652 653 /* 654 * Handle path verification event in offline state. 655 */ 656 static void ccw_device_offline_verify(struct ccw_device *cdev, 657 enum dev_event dev_event) 658 { 659 struct subchannel *sch = to_subchannel(cdev->dev.parent); 660 661 css_schedule_eval(sch->schid); 662 } 663 664 /* 665 * Handle path verification event. 666 */ 667 static void 668 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) 669 { 670 struct subchannel *sch; 671 672 if (cdev->private->state == DEV_STATE_W4SENSE) { 673 cdev->private->flags.doverify = 1; 674 return; 675 } 676 sch = to_subchannel(cdev->dev.parent); 677 /* 678 * Since we might not just be coming from an interrupt from the 679 * subchannel we have to update the schib. 680 */ 681 if (cio_update_schib(sch)) { 682 ccw_device_verify_done(cdev, -ENODEV); 683 return; 684 } 685 686 if (scsw_actl(&sch->schib.scsw) != 0 || 687 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || 688 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { 689 /* 690 * No final status yet or final status not yet delivered 691 * to the device driver. Can't do path verfication now, 692 * delay until final status was delivered. 693 */ 694 cdev->private->flags.doverify = 1; 695 return; 696 } 697 /* Device is idle, we can do the path verification. */ 698 cdev->private->state = DEV_STATE_VERIFY; 699 ccw_device_verify_start(cdev); 700 } 701 702 /* 703 * Handle path verification event in boxed state. 704 */ 705 static void ccw_device_boxed_verify(struct ccw_device *cdev, 706 enum dev_event dev_event) 707 { 708 struct subchannel *sch = to_subchannel(cdev->dev.parent); 709 710 if (cdev->online) { 711 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) 712 ccw_device_done(cdev, DEV_STATE_NOT_OPER); 713 else 714 ccw_device_online_verify(cdev, dev_event); 715 } else 716 css_schedule_eval(sch->schid); 717 } 718 719 /* 720 * Got an interrupt for a normal io (state online). 721 */ 722 static void 723 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) 724 { 725 struct irb *irb; 726 int is_cmd; 727 728 irb = (struct irb *)&S390_lowcore.irb; 729 is_cmd = !scsw_is_tm(&irb->scsw); 730 /* Check for unsolicited interrupt. */ 731 if (!scsw_is_solicited(&irb->scsw)) { 732 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && 733 !irb->esw.esw0.erw.cons) { 734 /* Unit check but no sense data. Need basic sense. */ 735 if (ccw_device_do_sense(cdev, irb) != 0) 736 goto call_handler_unsol; 737 memcpy(&cdev->private->irb, irb, sizeof(struct irb)); 738 cdev->private->state = DEV_STATE_W4SENSE; 739 cdev->private->intparm = 0; 740 return; 741 } 742 call_handler_unsol: 743 if (cdev->handler) 744 cdev->handler (cdev, 0, irb); 745 if (cdev->private->flags.doverify) 746 ccw_device_online_verify(cdev, 0); 747 return; 748 } 749 /* Accumulate status and find out if a basic sense is needed. */ 750 ccw_device_accumulate_irb(cdev, irb); 751 if (is_cmd && cdev->private->flags.dosense) { 752 if (ccw_device_do_sense(cdev, irb) == 0) { 753 cdev->private->state = DEV_STATE_W4SENSE; 754 } 755 return; 756 } 757 /* Call the handler. */ 758 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 759 /* Start delayed path verification. */ 760 ccw_device_online_verify(cdev, 0); 761 } 762 763 /* 764 * Got an timeout in online state. 765 */ 766 static void 767 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) 768 { 769 int ret; 770 771 ccw_device_set_timeout(cdev, 0); 772 cdev->private->iretry = 255; 773 ret = ccw_device_cancel_halt_clear(cdev); 774 if (ret == -EBUSY) { 775 ccw_device_set_timeout(cdev, 3*HZ); 776 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 777 return; 778 } 779 if (ret) 780 dev_fsm_event(cdev, DEV_EVENT_NOTOPER); 781 else if (cdev->handler) 782 cdev->handler(cdev, cdev->private->intparm, 783 ERR_PTR(-ETIMEDOUT)); 784 } 785 786 /* 787 * Got an interrupt for a basic sense. 788 */ 789 static void 790 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) 791 { 792 struct irb *irb; 793 794 irb = (struct irb *)&S390_lowcore.irb; 795 /* Check for unsolicited interrupt. */ 796 if (scsw_stctl(&irb->scsw) == 797 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { 798 if (scsw_cc(&irb->scsw) == 1) 799 /* Basic sense hasn't started. Try again. */ 800 ccw_device_do_sense(cdev, irb); 801 else { 802 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " 803 "interrupt during w4sense...\n", 804 cdev->private->dev_id.ssid, 805 cdev->private->dev_id.devno); 806 if (cdev->handler) 807 cdev->handler (cdev, 0, irb); 808 } 809 return; 810 } 811 /* 812 * Check if a halt or clear has been issued in the meanwhile. If yes, 813 * only deliver the halt/clear interrupt to the device driver as if it 814 * had killed the original request. 815 */ 816 if (scsw_fctl(&irb->scsw) & 817 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { 818 cdev->private->flags.dosense = 0; 819 memset(&cdev->private->irb, 0, sizeof(struct irb)); 820 ccw_device_accumulate_irb(cdev, irb); 821 goto call_handler; 822 } 823 /* Add basic sense info to irb. */ 824 ccw_device_accumulate_basic_sense(cdev, irb); 825 if (cdev->private->flags.dosense) { 826 /* Another basic sense is needed. */ 827 ccw_device_do_sense(cdev, irb); 828 return; 829 } 830 call_handler: 831 cdev->private->state = DEV_STATE_ONLINE; 832 /* In case sensing interfered with setting the device online */ 833 wake_up(&cdev->private->wait_q); 834 /* Call the handler. */ 835 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) 836 /* Start delayed path verification. */ 837 ccw_device_online_verify(cdev, 0); 838 } 839 840 static void 841 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) 842 { 843 struct subchannel *sch; 844 845 sch = to_subchannel(cdev->dev.parent); 846 ccw_device_set_timeout(cdev, 0); 847 /* Start delayed path verification. */ 848 ccw_device_online_verify(cdev, 0); 849 /* OK, i/o is dead now. Call interrupt handler. */ 850 if (cdev->handler) 851 cdev->handler(cdev, cdev->private->intparm, 852 ERR_PTR(-EIO)); 853 } 854 855 static void 856 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) 857 { 858 int ret; 859 860 ret = ccw_device_cancel_halt_clear(cdev); 861 if (ret == -EBUSY) { 862 ccw_device_set_timeout(cdev, 3*HZ); 863 return; 864 } 865 /* Start delayed path verification. */ 866 ccw_device_online_verify(cdev, 0); 867 if (cdev->handler) 868 cdev->handler(cdev, cdev->private->intparm, 869 ERR_PTR(-EIO)); 870 } 871 872 void ccw_device_kill_io(struct ccw_device *cdev) 873 { 874 int ret; 875 876 cdev->private->iretry = 255; 877 ret = ccw_device_cancel_halt_clear(cdev); 878 if (ret == -EBUSY) { 879 ccw_device_set_timeout(cdev, 3*HZ); 880 cdev->private->state = DEV_STATE_TIMEOUT_KILL; 881 return; 882 } 883 /* Start delayed path verification. */ 884 ccw_device_online_verify(cdev, 0); 885 if (cdev->handler) 886 cdev->handler(cdev, cdev->private->intparm, 887 ERR_PTR(-EIO)); 888 } 889 890 static void 891 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) 892 { 893 /* Start verification after current task finished. */ 894 cdev->private->flags.doverify = 1; 895 } 896 897 static void 898 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) 899 { 900 struct subchannel *sch; 901 902 sch = to_subchannel(cdev->dev.parent); 903 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) 904 /* Couldn't enable the subchannel for i/o. Sick device. */ 905 return; 906 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; 907 ccw_device_sense_id_start(cdev); 908 } 909 910 void ccw_device_trigger_reprobe(struct ccw_device *cdev) 911 { 912 struct subchannel *sch; 913 914 if (cdev->private->state != DEV_STATE_DISCONNECTED) 915 return; 916 917 sch = to_subchannel(cdev->dev.parent); 918 /* Update some values. */ 919 if (cio_update_schib(sch)) 920 return; 921 /* 922 * The pim, pam, pom values may not be accurate, but they are the best 923 * we have before performing device selection :/ 924 */ 925 sch->lpm = sch->schib.pmcw.pam & sch->opm; 926 /* 927 * Use the initial configuration since we can't be shure that the old 928 * paths are valid. 929 */ 930 io_subchannel_init_config(sch); 931 if (cio_commit_config(sch)) 932 return; 933 934 /* We should also udate ssd info, but this has to wait. */ 935 /* Check if this is another device which appeared on the same sch. */ 936 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) 937 css_schedule_eval(sch->schid); 938 else 939 ccw_device_start_id(cdev, 0); 940 } 941 942 static void ccw_device_disabled_irq(struct ccw_device *cdev, 943 enum dev_event dev_event) 944 { 945 struct subchannel *sch; 946 947 sch = to_subchannel(cdev->dev.parent); 948 /* 949 * An interrupt in a disabled state means a previous disable was not 950 * successful - should not happen, but we try to disable again. 951 */ 952 cio_disable_subchannel(sch); 953 } 954 955 static void 956 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) 957 { 958 retry_set_schib(cdev); 959 cdev->private->state = DEV_STATE_ONLINE; 960 dev_fsm_event(cdev, dev_event); 961 } 962 963 static void ccw_device_update_cmfblock(struct ccw_device *cdev, 964 enum dev_event dev_event) 965 { 966 cmf_retry_copy_block(cdev); 967 cdev->private->state = DEV_STATE_ONLINE; 968 dev_fsm_event(cdev, dev_event); 969 } 970 971 static void 972 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) 973 { 974 ccw_device_set_timeout(cdev, 0); 975 cdev->private->state = DEV_STATE_NOT_OPER; 976 wake_up(&cdev->private->wait_q); 977 } 978 979 static void 980 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) 981 { 982 int ret; 983 984 ret = ccw_device_cancel_halt_clear(cdev); 985 if (ret == -EBUSY) { 986 ccw_device_set_timeout(cdev, HZ/10); 987 } else { 988 cdev->private->state = DEV_STATE_NOT_OPER; 989 wake_up(&cdev->private->wait_q); 990 } 991 } 992 993 /* 994 * No operation action. This is used e.g. to ignore a timeout event in 995 * state offline. 996 */ 997 static void 998 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) 999 { 1000 } 1001 1002 /* 1003 * device statemachine 1004 */ 1005 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { 1006 [DEV_STATE_NOT_OPER] = { 1007 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1008 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 1009 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1010 [DEV_EVENT_VERIFY] = ccw_device_nop, 1011 }, 1012 [DEV_STATE_SENSE_PGID] = { 1013 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1014 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1015 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1016 [DEV_EVENT_VERIFY] = ccw_device_nop, 1017 }, 1018 [DEV_STATE_SENSE_ID] = { 1019 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1020 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1021 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1022 [DEV_EVENT_VERIFY] = ccw_device_nop, 1023 }, 1024 [DEV_STATE_OFFLINE] = { 1025 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1026 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, 1027 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1028 [DEV_EVENT_VERIFY] = ccw_device_offline_verify, 1029 }, 1030 [DEV_STATE_VERIFY] = { 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_delay_verify, 1035 }, 1036 [DEV_STATE_ONLINE] = { 1037 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1038 [DEV_EVENT_INTERRUPT] = ccw_device_irq, 1039 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, 1040 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1041 }, 1042 [DEV_STATE_W4SENSE] = { 1043 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1044 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, 1045 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1046 [DEV_EVENT_VERIFY] = ccw_device_online_verify, 1047 }, 1048 [DEV_STATE_DISBAND_PGID] = { 1049 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1050 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1051 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1052 [DEV_EVENT_VERIFY] = ccw_device_nop, 1053 }, 1054 [DEV_STATE_BOXED] = { 1055 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1056 [DEV_EVENT_INTERRUPT] = ccw_device_nop, 1057 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1058 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify, 1059 }, 1060 /* states to wait for i/o completion before doing something */ 1061 [DEV_STATE_TIMEOUT_KILL] = { 1062 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, 1063 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, 1064 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, 1065 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME 1066 }, 1067 [DEV_STATE_QUIESCE] = { 1068 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, 1069 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, 1070 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, 1071 [DEV_EVENT_VERIFY] = ccw_device_nop, 1072 }, 1073 /* special states for devices gone not operational */ 1074 [DEV_STATE_DISCONNECTED] = { 1075 [DEV_EVENT_NOTOPER] = ccw_device_nop, 1076 [DEV_EVENT_INTERRUPT] = ccw_device_start_id, 1077 [DEV_EVENT_TIMEOUT] = ccw_device_nop, 1078 [DEV_EVENT_VERIFY] = ccw_device_start_id, 1079 }, 1080 [DEV_STATE_DISCONNECTED_SENSE_ID] = { 1081 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1082 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1083 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1084 [DEV_EVENT_VERIFY] = ccw_device_nop, 1085 }, 1086 [DEV_STATE_CMFCHANGE] = { 1087 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, 1088 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, 1089 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, 1090 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, 1091 }, 1092 [DEV_STATE_CMFUPDATE] = { 1093 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, 1094 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, 1095 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, 1096 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, 1097 }, 1098 [DEV_STATE_STEAL_LOCK] = { 1099 [DEV_EVENT_NOTOPER] = ccw_device_request_event, 1100 [DEV_EVENT_INTERRUPT] = ccw_device_request_event, 1101 [DEV_EVENT_TIMEOUT] = ccw_device_request_event, 1102 [DEV_EVENT_VERIFY] = ccw_device_nop, 1103 }, 1104 }; 1105 1106 EXPORT_SYMBOL_GPL(ccw_device_set_timeout); 1107