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