Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/cio/device_fsm.c |
| 3 | * finite state machine for device handling |
| 4 | * |
| 5 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, |
| 6 | * IBM Corporation |
| 7 | * Author(s): Cornelia Huck(cohuck@de.ibm.com) |
| 8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 9 | */ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/init.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame^] | 14 | #include <linux/jiffies.h> |
| 15 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
| 17 | #include <asm/ccwdev.h> |
Cornelia Huck | 4c24da7 | 2005-09-03 15:58:01 -0700 | [diff] [blame] | 18 | #include <asm/cio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | #include "cio.h" |
| 21 | #include "cio_debug.h" |
| 22 | #include "css.h" |
| 23 | #include "device.h" |
| 24 | #include "chsc.h" |
| 25 | #include "ioasm.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | int |
| 28 | device_is_online(struct subchannel *sch) |
| 29 | { |
| 30 | struct ccw_device *cdev; |
| 31 | |
| 32 | if (!sch->dev.driver_data) |
| 33 | return 0; |
| 34 | cdev = sch->dev.driver_data; |
| 35 | return (cdev->private->state == DEV_STATE_ONLINE); |
| 36 | } |
| 37 | |
| 38 | int |
| 39 | device_is_disconnected(struct subchannel *sch) |
| 40 | { |
| 41 | struct ccw_device *cdev; |
| 42 | |
| 43 | if (!sch->dev.driver_data) |
| 44 | return 0; |
| 45 | cdev = sch->dev.driver_data; |
| 46 | return (cdev->private->state == DEV_STATE_DISCONNECTED || |
| 47 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); |
| 48 | } |
| 49 | |
| 50 | void |
| 51 | device_set_disconnected(struct subchannel *sch) |
| 52 | { |
| 53 | struct ccw_device *cdev; |
| 54 | |
| 55 | if (!sch->dev.driver_data) |
| 56 | return; |
| 57 | cdev = sch->dev.driver_data; |
| 58 | ccw_device_set_timeout(cdev, 0); |
| 59 | cdev->private->flags.fake_irb = 0; |
| 60 | cdev->private->state = DEV_STATE_DISCONNECTED; |
| 61 | } |
| 62 | |
| 63 | void |
| 64 | device_set_waiting(struct subchannel *sch) |
| 65 | { |
| 66 | struct ccw_device *cdev; |
| 67 | |
| 68 | if (!sch->dev.driver_data) |
| 69 | return; |
| 70 | cdev = sch->dev.driver_data; |
| 71 | ccw_device_set_timeout(cdev, 10*HZ); |
| 72 | cdev->private->state = DEV_STATE_WAIT4IO; |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. |
| 77 | */ |
| 78 | static void |
| 79 | ccw_device_timeout(unsigned long data) |
| 80 | { |
| 81 | struct ccw_device *cdev; |
| 82 | |
| 83 | cdev = (struct ccw_device *) data; |
| 84 | spin_lock_irq(cdev->ccwlock); |
| 85 | dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); |
| 86 | spin_unlock_irq(cdev->ccwlock); |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * Set timeout |
| 91 | */ |
| 92 | void |
| 93 | ccw_device_set_timeout(struct ccw_device *cdev, int expires) |
| 94 | { |
| 95 | if (expires == 0) { |
| 96 | del_timer(&cdev->private->timer); |
| 97 | return; |
| 98 | } |
| 99 | if (timer_pending(&cdev->private->timer)) { |
| 100 | if (mod_timer(&cdev->private->timer, jiffies + expires)) |
| 101 | return; |
| 102 | } |
| 103 | cdev->private->timer.function = ccw_device_timeout; |
| 104 | cdev->private->timer.data = (unsigned long) cdev; |
| 105 | cdev->private->timer.expires = jiffies + expires; |
| 106 | add_timer(&cdev->private->timer); |
| 107 | } |
| 108 | |
| 109 | /* Kill any pending timers after machine check. */ |
| 110 | void |
| 111 | device_kill_pending_timer(struct subchannel *sch) |
| 112 | { |
| 113 | struct ccw_device *cdev; |
| 114 | |
| 115 | if (!sch->dev.driver_data) |
| 116 | return; |
| 117 | cdev = sch->dev.driver_data; |
| 118 | ccw_device_set_timeout(cdev, 0); |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Cancel running i/o. This is called repeatedly since halt/clear are |
| 123 | * asynchronous operations. We do one try with cio_cancel, two tries |
| 124 | * with cio_halt, 255 tries with cio_clear. If everythings fails panic. |
| 125 | * Returns 0 if device now idle, -ENODEV for device not operational and |
| 126 | * -EBUSY if an interrupt is expected (either from halt/clear or from a |
| 127 | * status pending). |
| 128 | */ |
| 129 | int |
| 130 | ccw_device_cancel_halt_clear(struct ccw_device *cdev) |
| 131 | { |
| 132 | struct subchannel *sch; |
| 133 | int ret; |
| 134 | |
| 135 | sch = to_subchannel(cdev->dev.parent); |
| 136 | ret = stsch(sch->irq, &sch->schib); |
| 137 | if (ret || !sch->schib.pmcw.dnv) |
| 138 | return -ENODEV; |
| 139 | if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0) |
| 140 | /* Not operational or no activity -> done. */ |
| 141 | return 0; |
| 142 | /* Stage 1: cancel io. */ |
| 143 | if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) && |
| 144 | !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) { |
| 145 | ret = cio_cancel(sch); |
| 146 | if (ret != -EINVAL) |
| 147 | return ret; |
| 148 | /* cancel io unsuccessful. From now on it is asynchronous. */ |
| 149 | cdev->private->iretry = 3; /* 3 halt retries. */ |
| 150 | } |
| 151 | if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) { |
| 152 | /* Stage 2: halt io. */ |
| 153 | if (cdev->private->iretry) { |
| 154 | cdev->private->iretry--; |
| 155 | ret = cio_halt(sch); |
| 156 | return (ret == 0) ? -EBUSY : ret; |
| 157 | } |
| 158 | /* halt io unsuccessful. */ |
| 159 | cdev->private->iretry = 255; /* 255 clear retries. */ |
| 160 | } |
| 161 | /* Stage 3: clear io. */ |
| 162 | if (cdev->private->iretry) { |
| 163 | cdev->private->iretry--; |
| 164 | ret = cio_clear (sch); |
| 165 | return (ret == 0) ? -EBUSY : ret; |
| 166 | } |
| 167 | panic("Can't stop i/o on subchannel.\n"); |
| 168 | } |
| 169 | |
| 170 | static int |
| 171 | ccw_device_handle_oper(struct ccw_device *cdev) |
| 172 | { |
| 173 | struct subchannel *sch; |
| 174 | |
| 175 | sch = to_subchannel(cdev->dev.parent); |
| 176 | cdev->private->flags.recog_done = 1; |
| 177 | /* |
| 178 | * Check if cu type and device type still match. If |
| 179 | * not, it is certainly another device and we have to |
| 180 | * de- and re-register. Also check here for non-matching devno. |
| 181 | */ |
| 182 | if (cdev->id.cu_type != cdev->private->senseid.cu_type || |
| 183 | cdev->id.cu_model != cdev->private->senseid.cu_model || |
| 184 | cdev->id.dev_type != cdev->private->senseid.dev_type || |
| 185 | cdev->id.dev_model != cdev->private->senseid.dev_model || |
| 186 | cdev->private->devno != sch->schib.pmcw.dev) { |
| 187 | PREPARE_WORK(&cdev->private->kick_work, |
| 188 | ccw_device_do_unreg_rereg, (void *)cdev); |
| 189 | queue_work(ccw_device_work, &cdev->private->kick_work); |
| 190 | return 0; |
| 191 | } |
| 192 | cdev->private->flags.donotify = 1; |
| 193 | return 1; |
| 194 | } |
| 195 | |
| 196 | /* |
| 197 | * The machine won't give us any notification by machine check if a chpid has |
| 198 | * been varied online on the SE so we have to find out by magic (i. e. driving |
| 199 | * the channel subsystem to device selection and updating our path masks). |
| 200 | */ |
| 201 | static inline void |
| 202 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) |
| 203 | { |
| 204 | int mask, i; |
| 205 | |
| 206 | for (i = 0; i<8; i++) { |
| 207 | mask = 0x80 >> i; |
| 208 | if (!(sch->lpm & mask)) |
| 209 | continue; |
| 210 | if (old_lpm & mask) |
| 211 | continue; |
| 212 | chpid_is_actually_online(sch->schib.pmcw.chpid[i]); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Stop device recognition. |
| 218 | */ |
| 219 | static void |
| 220 | ccw_device_recog_done(struct ccw_device *cdev, int state) |
| 221 | { |
| 222 | struct subchannel *sch; |
| 223 | int notify, old_lpm, same_dev; |
| 224 | |
| 225 | sch = to_subchannel(cdev->dev.parent); |
| 226 | |
| 227 | ccw_device_set_timeout(cdev, 0); |
| 228 | cio_disable_subchannel(sch); |
| 229 | /* |
| 230 | * Now that we tried recognition, we have performed device selection |
| 231 | * through ssch() and the path information is up to date. |
| 232 | */ |
| 233 | old_lpm = sch->lpm; |
| 234 | stsch(sch->irq, &sch->schib); |
| 235 | sch->lpm = sch->schib.pmcw.pim & |
| 236 | sch->schib.pmcw.pam & |
| 237 | sch->schib.pmcw.pom & |
| 238 | sch->opm; |
Cornelia Huck | 4ffa923 | 2005-07-29 14:03:37 -0700 | [diff] [blame] | 239 | /* Check since device may again have become not operational. */ |
| 240 | if (!sch->schib.pmcw.dnv) |
| 241 | state = DEV_STATE_NOT_OPER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) |
| 243 | /* Force reprobe on all chpids. */ |
| 244 | old_lpm = 0; |
| 245 | if (sch->lpm != old_lpm) |
| 246 | __recover_lost_chpids(sch, old_lpm); |
| 247 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { |
| 248 | if (state == DEV_STATE_NOT_OPER) { |
| 249 | cdev->private->flags.recog_done = 1; |
| 250 | cdev->private->state = DEV_STATE_DISCONNECTED; |
| 251 | return; |
| 252 | } |
| 253 | /* Boxed devices don't need extra treatment. */ |
| 254 | } |
| 255 | notify = 0; |
| 256 | same_dev = 0; /* Keep the compiler quiet... */ |
| 257 | switch (state) { |
| 258 | case DEV_STATE_NOT_OPER: |
| 259 | CIO_DEBUG(KERN_WARNING, 2, |
| 260 | "SenseID : unknown device %04x on subchannel %04x\n", |
| 261 | cdev->private->devno, sch->irq); |
| 262 | break; |
| 263 | case DEV_STATE_OFFLINE: |
| 264 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { |
| 265 | same_dev = ccw_device_handle_oper(cdev); |
| 266 | notify = 1; |
| 267 | } |
| 268 | /* fill out sense information */ |
| 269 | cdev->id = (struct ccw_device_id) { |
| 270 | .cu_type = cdev->private->senseid.cu_type, |
| 271 | .cu_model = cdev->private->senseid.cu_model, |
| 272 | .dev_type = cdev->private->senseid.dev_type, |
| 273 | .dev_model = cdev->private->senseid.dev_model, |
| 274 | }; |
| 275 | if (notify) { |
| 276 | cdev->private->state = DEV_STATE_OFFLINE; |
| 277 | if (same_dev) { |
| 278 | /* Get device online again. */ |
| 279 | ccw_device_online(cdev); |
| 280 | wake_up(&cdev->private->wait_q); |
| 281 | } |
| 282 | return; |
| 283 | } |
| 284 | /* Issue device info message. */ |
| 285 | CIO_DEBUG(KERN_INFO, 2, "SenseID : device %04x reports: " |
| 286 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " |
| 287 | "%04X/%02X\n", cdev->private->devno, |
| 288 | cdev->id.cu_type, cdev->id.cu_model, |
| 289 | cdev->id.dev_type, cdev->id.dev_model); |
| 290 | break; |
| 291 | case DEV_STATE_BOXED: |
| 292 | CIO_DEBUG(KERN_WARNING, 2, |
| 293 | "SenseID : boxed device %04x on subchannel %04x\n", |
| 294 | cdev->private->devno, sch->irq); |
| 295 | break; |
| 296 | } |
| 297 | cdev->private->state = state; |
| 298 | io_subchannel_recog_done(cdev); |
| 299 | if (state != DEV_STATE_NOT_OPER) |
| 300 | wake_up(&cdev->private->wait_q); |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * Function called from device_id.c after sense id has completed. |
| 305 | */ |
| 306 | void |
| 307 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) |
| 308 | { |
| 309 | switch (err) { |
| 310 | case 0: |
| 311 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); |
| 312 | break; |
| 313 | case -ETIME: /* Sense id stopped by timeout. */ |
| 314 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); |
| 315 | break; |
| 316 | default: |
| 317 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); |
| 318 | break; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | static void |
| 323 | ccw_device_oper_notify(void *data) |
| 324 | { |
| 325 | struct ccw_device *cdev; |
| 326 | struct subchannel *sch; |
| 327 | int ret; |
| 328 | |
| 329 | cdev = (struct ccw_device *)data; |
| 330 | sch = to_subchannel(cdev->dev.parent); |
| 331 | ret = (sch->driver && sch->driver->notify) ? |
| 332 | sch->driver->notify(&sch->dev, CIO_OPER) : 0; |
| 333 | if (!ret) |
| 334 | /* Driver doesn't want device back. */ |
| 335 | ccw_device_do_unreg_rereg((void *)cdev); |
| 336 | else |
| 337 | wake_up(&cdev->private->wait_q); |
| 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 | if (state != DEV_STATE_ONLINE) |
| 351 | cio_disable_subchannel(sch); |
| 352 | |
| 353 | /* Reset device status. */ |
| 354 | memset(&cdev->private->irb, 0, sizeof(struct irb)); |
| 355 | |
| 356 | cdev->private->state = state; |
| 357 | |
| 358 | |
| 359 | if (state == DEV_STATE_BOXED) |
| 360 | CIO_DEBUG(KERN_WARNING, 2, |
| 361 | "Boxed device %04x on subchannel %04x\n", |
| 362 | cdev->private->devno, sch->irq); |
| 363 | |
| 364 | if (cdev->private->flags.donotify) { |
| 365 | cdev->private->flags.donotify = 0; |
| 366 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify, |
| 367 | (void *)cdev); |
| 368 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
| 369 | } |
| 370 | wake_up(&cdev->private->wait_q); |
| 371 | |
| 372 | if (css_init_done && state != DEV_STATE_ONLINE) |
| 373 | put_device (&cdev->dev); |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Function called from device_pgid.c after sense path ground has completed. |
| 378 | */ |
| 379 | void |
| 380 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) |
| 381 | { |
| 382 | struct subchannel *sch; |
| 383 | |
| 384 | sch = to_subchannel(cdev->dev.parent); |
| 385 | switch (err) { |
| 386 | case 0: |
| 387 | /* Start Path Group verification. */ |
| 388 | sch->vpm = 0; /* Start with no path groups set. */ |
| 389 | cdev->private->state = DEV_STATE_VERIFY; |
| 390 | ccw_device_verify_start(cdev); |
| 391 | break; |
| 392 | case -ETIME: /* Sense path group id stopped by timeout. */ |
| 393 | case -EUSERS: /* device is reserved for someone else. */ |
| 394 | ccw_device_done(cdev, DEV_STATE_BOXED); |
| 395 | break; |
| 396 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ |
| 397 | cdev->private->options.pgroup = 0; |
| 398 | ccw_device_done(cdev, DEV_STATE_ONLINE); |
| 399 | break; |
| 400 | default: |
| 401 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
| 402 | break; |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * Start device recognition. |
| 408 | */ |
| 409 | int |
| 410 | ccw_device_recognition(struct ccw_device *cdev) |
| 411 | { |
| 412 | struct subchannel *sch; |
| 413 | int ret; |
| 414 | |
| 415 | if ((cdev->private->state != DEV_STATE_NOT_OPER) && |
| 416 | (cdev->private->state != DEV_STATE_BOXED)) |
| 417 | return -EINVAL; |
| 418 | sch = to_subchannel(cdev->dev.parent); |
| 419 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); |
| 420 | if (ret != 0) |
| 421 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
| 422 | return ret; |
| 423 | |
| 424 | /* After 60s the device recognition is considered to have failed. */ |
| 425 | ccw_device_set_timeout(cdev, 60*HZ); |
| 426 | |
| 427 | /* |
| 428 | * We used to start here with a sense pgid to find out whether a device |
| 429 | * is locked by someone else. Unfortunately, the sense pgid command |
| 430 | * code has other meanings on devices predating the path grouping |
| 431 | * algorithm, so we start with sense id and box the device after an |
| 432 | * timeout (or if sense pgid during path verification detects the device |
| 433 | * is locked, as may happen on newer devices). |
| 434 | */ |
| 435 | cdev->private->flags.recog_done = 0; |
| 436 | cdev->private->state = DEV_STATE_SENSE_ID; |
| 437 | ccw_device_sense_id_start(cdev); |
| 438 | return 0; |
| 439 | } |
| 440 | |
| 441 | /* |
| 442 | * Handle timeout in device recognition. |
| 443 | */ |
| 444 | static void |
| 445 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) |
| 446 | { |
| 447 | int ret; |
| 448 | |
| 449 | ret = ccw_device_cancel_halt_clear(cdev); |
| 450 | switch (ret) { |
| 451 | case 0: |
| 452 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); |
| 453 | break; |
| 454 | case -ENODEV: |
| 455 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); |
| 456 | break; |
| 457 | default: |
| 458 | ccw_device_set_timeout(cdev, 3*HZ); |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | |
| 463 | static void |
| 464 | ccw_device_nopath_notify(void *data) |
| 465 | { |
| 466 | struct ccw_device *cdev; |
| 467 | struct subchannel *sch; |
| 468 | int ret; |
| 469 | |
| 470 | cdev = (struct ccw_device *)data; |
| 471 | sch = to_subchannel(cdev->dev.parent); |
| 472 | /* Extra sanity. */ |
| 473 | if (sch->lpm) |
| 474 | return; |
| 475 | ret = (sch->driver && sch->driver->notify) ? |
| 476 | sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0; |
| 477 | if (!ret) { |
| 478 | if (get_device(&sch->dev)) { |
| 479 | /* Driver doesn't want to keep device. */ |
| 480 | cio_disable_subchannel(sch); |
| 481 | if (get_device(&cdev->dev)) { |
| 482 | PREPARE_WORK(&cdev->private->kick_work, |
| 483 | ccw_device_call_sch_unregister, |
| 484 | (void *)cdev); |
| 485 | queue_work(ccw_device_work, |
| 486 | &cdev->private->kick_work); |
| 487 | } else |
| 488 | put_device(&sch->dev); |
| 489 | } |
| 490 | } else { |
| 491 | cio_disable_subchannel(sch); |
| 492 | ccw_device_set_timeout(cdev, 0); |
| 493 | cdev->private->flags.fake_irb = 0; |
| 494 | cdev->private->state = DEV_STATE_DISCONNECTED; |
| 495 | wake_up(&cdev->private->wait_q); |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | void |
| 500 | ccw_device_verify_done(struct ccw_device *cdev, int err) |
| 501 | { |
| 502 | cdev->private->flags.doverify = 0; |
| 503 | switch (err) { |
| 504 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ |
| 505 | cdev->private->options.pgroup = 0; |
| 506 | case 0: |
| 507 | ccw_device_done(cdev, DEV_STATE_ONLINE); |
| 508 | /* Deliver fake irb to device driver, if needed. */ |
| 509 | if (cdev->private->flags.fake_irb) { |
| 510 | memset(&cdev->private->irb, 0, sizeof(struct irb)); |
| 511 | cdev->private->irb.scsw = (struct scsw) { |
| 512 | .cc = 1, |
| 513 | .fctl = SCSW_FCTL_START_FUNC, |
| 514 | .actl = SCSW_ACTL_START_PEND, |
| 515 | .stctl = SCSW_STCTL_STATUS_PEND, |
| 516 | }; |
| 517 | cdev->private->flags.fake_irb = 0; |
| 518 | if (cdev->handler) |
| 519 | cdev->handler(cdev, cdev->private->intparm, |
| 520 | &cdev->private->irb); |
| 521 | memset(&cdev->private->irb, 0, sizeof(struct irb)); |
| 522 | } |
| 523 | break; |
| 524 | case -ETIME: |
| 525 | ccw_device_done(cdev, DEV_STATE_BOXED); |
| 526 | break; |
| 527 | default: |
| 528 | PREPARE_WORK(&cdev->private->kick_work, |
| 529 | ccw_device_nopath_notify, (void *)cdev); |
| 530 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
| 531 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
| 532 | break; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * Get device online. |
| 538 | */ |
| 539 | int |
| 540 | ccw_device_online(struct ccw_device *cdev) |
| 541 | { |
| 542 | struct subchannel *sch; |
| 543 | int ret; |
| 544 | |
| 545 | if ((cdev->private->state != DEV_STATE_OFFLINE) && |
| 546 | (cdev->private->state != DEV_STATE_BOXED)) |
| 547 | return -EINVAL; |
| 548 | sch = to_subchannel(cdev->dev.parent); |
| 549 | if (css_init_done && !get_device(&cdev->dev)) |
| 550 | return -ENODEV; |
| 551 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); |
| 552 | if (ret != 0) { |
| 553 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
| 554 | if (ret == -ENODEV) |
| 555 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
| 556 | return ret; |
| 557 | } |
| 558 | /* Do we want to do path grouping? */ |
| 559 | if (!cdev->private->options.pgroup) { |
| 560 | /* No, set state online immediately. */ |
| 561 | ccw_device_done(cdev, DEV_STATE_ONLINE); |
| 562 | return 0; |
| 563 | } |
| 564 | /* Do a SensePGID first. */ |
| 565 | cdev->private->state = DEV_STATE_SENSE_PGID; |
| 566 | ccw_device_sense_pgid_start(cdev); |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | void |
| 571 | ccw_device_disband_done(struct ccw_device *cdev, int err) |
| 572 | { |
| 573 | switch (err) { |
| 574 | case 0: |
| 575 | ccw_device_done(cdev, DEV_STATE_OFFLINE); |
| 576 | break; |
| 577 | case -ETIME: |
| 578 | ccw_device_done(cdev, DEV_STATE_BOXED); |
| 579 | break; |
| 580 | default: |
| 581 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
| 582 | break; |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * Shutdown device. |
| 588 | */ |
| 589 | int |
| 590 | ccw_device_offline(struct ccw_device *cdev) |
| 591 | { |
| 592 | struct subchannel *sch; |
| 593 | |
| 594 | sch = to_subchannel(cdev->dev.parent); |
| 595 | if (stsch(sch->irq, &sch->schib) || !sch->schib.pmcw.dnv) |
| 596 | return -ENODEV; |
| 597 | if (cdev->private->state != DEV_STATE_ONLINE) { |
| 598 | if (sch->schib.scsw.actl != 0) |
| 599 | return -EBUSY; |
| 600 | return -EINVAL; |
| 601 | } |
| 602 | if (sch->schib.scsw.actl != 0) |
| 603 | return -EBUSY; |
| 604 | /* Are we doing path grouping? */ |
| 605 | if (!cdev->private->options.pgroup) { |
| 606 | /* No, set state offline immediately. */ |
| 607 | ccw_device_done(cdev, DEV_STATE_OFFLINE); |
| 608 | return 0; |
| 609 | } |
| 610 | /* Start Set Path Group commands. */ |
| 611 | cdev->private->state = DEV_STATE_DISBAND_PGID; |
| 612 | ccw_device_disband_start(cdev); |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | /* |
| 617 | * Handle timeout in device online/offline process. |
| 618 | */ |
| 619 | static void |
| 620 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) |
| 621 | { |
| 622 | int ret; |
| 623 | |
| 624 | ret = ccw_device_cancel_halt_clear(cdev); |
| 625 | switch (ret) { |
| 626 | case 0: |
| 627 | ccw_device_done(cdev, DEV_STATE_BOXED); |
| 628 | break; |
| 629 | case -ENODEV: |
| 630 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
| 631 | break; |
| 632 | default: |
| 633 | ccw_device_set_timeout(cdev, 3*HZ); |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Handle not oper event in device recognition. |
| 639 | */ |
| 640 | static void |
| 641 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) |
| 642 | { |
| 643 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * Handle not operational event while offline. |
| 648 | */ |
| 649 | static void |
| 650 | ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event) |
| 651 | { |
| 652 | struct subchannel *sch; |
| 653 | |
| 654 | cdev->private->state = DEV_STATE_NOT_OPER; |
| 655 | sch = to_subchannel(cdev->dev.parent); |
| 656 | if (get_device(&cdev->dev)) { |
| 657 | PREPARE_WORK(&cdev->private->kick_work, |
| 658 | ccw_device_call_sch_unregister, (void *)cdev); |
| 659 | queue_work(ccw_device_work, &cdev->private->kick_work); |
| 660 | } |
| 661 | wake_up(&cdev->private->wait_q); |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * Handle not operational event while online. |
| 666 | */ |
| 667 | static void |
| 668 | ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event) |
| 669 | { |
| 670 | struct subchannel *sch; |
| 671 | |
| 672 | sch = to_subchannel(cdev->dev.parent); |
| 673 | if (sch->driver->notify && |
| 674 | sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) { |
| 675 | ccw_device_set_timeout(cdev, 0); |
| 676 | cdev->private->flags.fake_irb = 0; |
| 677 | cdev->private->state = DEV_STATE_DISCONNECTED; |
| 678 | wake_up(&cdev->private->wait_q); |
| 679 | return; |
| 680 | } |
| 681 | cdev->private->state = DEV_STATE_NOT_OPER; |
| 682 | cio_disable_subchannel(sch); |
| 683 | if (sch->schib.scsw.actl != 0) { |
| 684 | // FIXME: not-oper indication to device driver ? |
| 685 | ccw_device_call_handler(cdev); |
| 686 | } |
| 687 | if (get_device(&cdev->dev)) { |
| 688 | PREPARE_WORK(&cdev->private->kick_work, |
| 689 | ccw_device_call_sch_unregister, (void *)cdev); |
| 690 | queue_work(ccw_device_work, &cdev->private->kick_work); |
| 691 | } |
| 692 | wake_up(&cdev->private->wait_q); |
| 693 | } |
| 694 | |
| 695 | /* |
| 696 | * Handle path verification event. |
| 697 | */ |
| 698 | static void |
| 699 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) |
| 700 | { |
| 701 | struct subchannel *sch; |
| 702 | |
| 703 | if (!cdev->private->options.pgroup) |
| 704 | return; |
| 705 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
| 706 | cdev->private->flags.doverify = 1; |
| 707 | return; |
| 708 | } |
| 709 | sch = to_subchannel(cdev->dev.parent); |
| 710 | /* |
| 711 | * Since we might not just be coming from an interrupt from the |
| 712 | * subchannel we have to update the schib. |
| 713 | */ |
| 714 | stsch(sch->irq, &sch->schib); |
| 715 | |
| 716 | if (sch->schib.scsw.actl != 0 || |
| 717 | (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) { |
| 718 | /* |
| 719 | * No final status yet or final status not yet delivered |
| 720 | * to the device driver. Can't do path verfication now, |
| 721 | * delay until final status was delivered. |
| 722 | */ |
| 723 | cdev->private->flags.doverify = 1; |
| 724 | return; |
| 725 | } |
| 726 | /* Device is idle, we can do the path verification. */ |
| 727 | cdev->private->state = DEV_STATE_VERIFY; |
| 728 | ccw_device_verify_start(cdev); |
| 729 | } |
| 730 | |
| 731 | /* |
| 732 | * Got an interrupt for a normal io (state online). |
| 733 | */ |
| 734 | static void |
| 735 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) |
| 736 | { |
| 737 | struct irb *irb; |
| 738 | |
| 739 | irb = (struct irb *) __LC_IRB; |
| 740 | /* Check for unsolicited interrupt. */ |
| 741 | if ((irb->scsw.stctl == |
| 742 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) |
| 743 | && (!irb->scsw.cc)) { |
| 744 | if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && |
| 745 | !irb->esw.esw0.erw.cons) { |
| 746 | /* Unit check but no sense data. Need basic sense. */ |
| 747 | if (ccw_device_do_sense(cdev, irb) != 0) |
| 748 | goto call_handler_unsol; |
| 749 | memcpy(irb, &cdev->private->irb, sizeof(struct irb)); |
| 750 | cdev->private->state = DEV_STATE_W4SENSE; |
| 751 | cdev->private->intparm = 0; |
| 752 | return; |
| 753 | } |
| 754 | call_handler_unsol: |
| 755 | if (cdev->handler) |
| 756 | cdev->handler (cdev, 0, irb); |
| 757 | return; |
| 758 | } |
| 759 | /* Accumulate status and find out if a basic sense is needed. */ |
| 760 | ccw_device_accumulate_irb(cdev, irb); |
| 761 | if (cdev->private->flags.dosense) { |
| 762 | if (ccw_device_do_sense(cdev, irb) == 0) { |
| 763 | cdev->private->state = DEV_STATE_W4SENSE; |
| 764 | } |
| 765 | return; |
| 766 | } |
| 767 | /* Call the handler. */ |
| 768 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) |
| 769 | /* Start delayed path verification. */ |
| 770 | ccw_device_online_verify(cdev, 0); |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | * Got an timeout in online state. |
| 775 | */ |
| 776 | static void |
| 777 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) |
| 778 | { |
| 779 | int ret; |
| 780 | |
| 781 | ccw_device_set_timeout(cdev, 0); |
| 782 | ret = ccw_device_cancel_halt_clear(cdev); |
| 783 | if (ret == -EBUSY) { |
| 784 | ccw_device_set_timeout(cdev, 3*HZ); |
| 785 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; |
| 786 | return; |
| 787 | } |
| 788 | if (ret == -ENODEV) { |
| 789 | struct subchannel *sch; |
| 790 | |
| 791 | sch = to_subchannel(cdev->dev.parent); |
| 792 | if (!sch->lpm) { |
| 793 | PREPARE_WORK(&cdev->private->kick_work, |
| 794 | ccw_device_nopath_notify, (void *)cdev); |
| 795 | queue_work(ccw_device_notify_work, |
| 796 | &cdev->private->kick_work); |
| 797 | } else |
| 798 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
| 799 | } else if (cdev->handler) |
| 800 | cdev->handler(cdev, cdev->private->intparm, |
| 801 | ERR_PTR(-ETIMEDOUT)); |
| 802 | } |
| 803 | |
| 804 | /* |
| 805 | * Got an interrupt for a basic sense. |
| 806 | */ |
| 807 | void |
| 808 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
| 809 | { |
| 810 | struct irb *irb; |
| 811 | |
| 812 | irb = (struct irb *) __LC_IRB; |
| 813 | /* Check for unsolicited interrupt. */ |
| 814 | if (irb->scsw.stctl == |
| 815 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { |
| 816 | if (irb->scsw.cc == 1) |
| 817 | /* Basic sense hasn't started. Try again. */ |
| 818 | ccw_device_do_sense(cdev, irb); |
| 819 | else { |
| 820 | printk("Huh? %s(%s): unsolicited interrupt...\n", |
| 821 | __FUNCTION__, cdev->dev.bus_id); |
| 822 | if (cdev->handler) |
| 823 | cdev->handler (cdev, 0, irb); |
| 824 | } |
| 825 | return; |
| 826 | } |
| 827 | /* Add basic sense info to irb. */ |
| 828 | ccw_device_accumulate_basic_sense(cdev, irb); |
| 829 | if (cdev->private->flags.dosense) { |
| 830 | /* Another basic sense is needed. */ |
| 831 | ccw_device_do_sense(cdev, irb); |
| 832 | return; |
| 833 | } |
| 834 | cdev->private->state = DEV_STATE_ONLINE; |
| 835 | /* Call the handler. */ |
| 836 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) |
| 837 | /* Start delayed path verification. */ |
| 838 | ccw_device_online_verify(cdev, 0); |
| 839 | } |
| 840 | |
| 841 | static void |
| 842 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) |
| 843 | { |
| 844 | struct irb *irb; |
| 845 | |
| 846 | irb = (struct irb *) __LC_IRB; |
| 847 | /* Accumulate status. We don't do basic sense. */ |
| 848 | ccw_device_accumulate_irb(cdev, irb); |
| 849 | /* Try to start delayed device verification. */ |
| 850 | ccw_device_online_verify(cdev, 0); |
| 851 | /* Note: Don't call handler for cio initiated clear! */ |
| 852 | } |
| 853 | |
| 854 | static void |
| 855 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) |
| 856 | { |
| 857 | struct subchannel *sch; |
| 858 | |
| 859 | sch = to_subchannel(cdev->dev.parent); |
| 860 | ccw_device_set_timeout(cdev, 0); |
| 861 | /* OK, i/o is dead now. Call interrupt handler. */ |
| 862 | cdev->private->state = DEV_STATE_ONLINE; |
| 863 | if (cdev->handler) |
| 864 | cdev->handler(cdev, cdev->private->intparm, |
| 865 | ERR_PTR(-ETIMEDOUT)); |
| 866 | if (!sch->lpm) { |
| 867 | PREPARE_WORK(&cdev->private->kick_work, |
| 868 | ccw_device_nopath_notify, (void *)cdev); |
| 869 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
| 870 | } else if (cdev->private->flags.doverify) |
| 871 | /* Start delayed path verification. */ |
| 872 | ccw_device_online_verify(cdev, 0); |
| 873 | } |
| 874 | |
| 875 | static void |
| 876 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) |
| 877 | { |
| 878 | int ret; |
| 879 | |
| 880 | ret = ccw_device_cancel_halt_clear(cdev); |
| 881 | if (ret == -EBUSY) { |
| 882 | ccw_device_set_timeout(cdev, 3*HZ); |
| 883 | return; |
| 884 | } |
| 885 | if (ret == -ENODEV) { |
| 886 | struct subchannel *sch; |
| 887 | |
| 888 | sch = to_subchannel(cdev->dev.parent); |
| 889 | if (!sch->lpm) { |
| 890 | PREPARE_WORK(&cdev->private->kick_work, |
| 891 | ccw_device_nopath_notify, (void *)cdev); |
| 892 | queue_work(ccw_device_notify_work, |
| 893 | &cdev->private->kick_work); |
| 894 | } else |
| 895 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
| 896 | return; |
| 897 | } |
| 898 | //FIXME: Can we get here? |
| 899 | cdev->private->state = DEV_STATE_ONLINE; |
| 900 | if (cdev->handler) |
| 901 | cdev->handler(cdev, cdev->private->intparm, |
| 902 | ERR_PTR(-ETIMEDOUT)); |
| 903 | } |
| 904 | |
| 905 | static void |
| 906 | ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event) |
| 907 | { |
| 908 | struct irb *irb; |
| 909 | struct subchannel *sch; |
| 910 | |
| 911 | irb = (struct irb *) __LC_IRB; |
| 912 | /* |
| 913 | * Accumulate status and find out if a basic sense is needed. |
| 914 | * This is fine since we have already adapted the lpm. |
| 915 | */ |
| 916 | ccw_device_accumulate_irb(cdev, irb); |
| 917 | if (cdev->private->flags.dosense) { |
| 918 | if (ccw_device_do_sense(cdev, irb) == 0) { |
| 919 | cdev->private->state = DEV_STATE_W4SENSE; |
| 920 | } |
| 921 | return; |
| 922 | } |
| 923 | |
| 924 | /* Iff device is idle, reset timeout. */ |
| 925 | sch = to_subchannel(cdev->dev.parent); |
| 926 | if (!stsch(sch->irq, &sch->schib)) |
| 927 | if (sch->schib.scsw.actl == 0) |
| 928 | ccw_device_set_timeout(cdev, 0); |
| 929 | /* Call the handler. */ |
| 930 | ccw_device_call_handler(cdev); |
| 931 | if (!sch->lpm) { |
| 932 | PREPARE_WORK(&cdev->private->kick_work, |
| 933 | ccw_device_nopath_notify, (void *)cdev); |
| 934 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
| 935 | } else if (cdev->private->flags.doverify) |
| 936 | ccw_device_online_verify(cdev, 0); |
| 937 | } |
| 938 | |
| 939 | static void |
| 940 | ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event) |
| 941 | { |
| 942 | int ret; |
| 943 | struct subchannel *sch; |
| 944 | |
| 945 | sch = to_subchannel(cdev->dev.parent); |
| 946 | ccw_device_set_timeout(cdev, 0); |
| 947 | ret = ccw_device_cancel_halt_clear(cdev); |
| 948 | if (ret == -EBUSY) { |
| 949 | ccw_device_set_timeout(cdev, 3*HZ); |
| 950 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; |
| 951 | return; |
| 952 | } |
| 953 | if (ret == -ENODEV) { |
| 954 | if (!sch->lpm) { |
| 955 | PREPARE_WORK(&cdev->private->kick_work, |
| 956 | ccw_device_nopath_notify, (void *)cdev); |
| 957 | queue_work(ccw_device_notify_work, |
| 958 | &cdev->private->kick_work); |
| 959 | } else |
| 960 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
| 961 | return; |
| 962 | } |
| 963 | if (cdev->handler) |
| 964 | cdev->handler(cdev, cdev->private->intparm, |
| 965 | ERR_PTR(-ETIMEDOUT)); |
| 966 | if (!sch->lpm) { |
| 967 | PREPARE_WORK(&cdev->private->kick_work, |
| 968 | ccw_device_nopath_notify, (void *)cdev); |
| 969 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
| 970 | } else if (cdev->private->flags.doverify) |
| 971 | /* Start delayed path verification. */ |
| 972 | ccw_device_online_verify(cdev, 0); |
| 973 | } |
| 974 | |
| 975 | static void |
| 976 | ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event) |
| 977 | { |
| 978 | /* When the I/O has terminated, we have to start verification. */ |
| 979 | if (cdev->private->options.pgroup) |
| 980 | cdev->private->flags.doverify = 1; |
| 981 | } |
| 982 | |
| 983 | static void |
| 984 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) |
| 985 | { |
| 986 | struct irb *irb; |
| 987 | |
| 988 | switch (dev_event) { |
| 989 | case DEV_EVENT_INTERRUPT: |
| 990 | irb = (struct irb *) __LC_IRB; |
| 991 | /* Check for unsolicited interrupt. */ |
| 992 | if ((irb->scsw.stctl == |
| 993 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && |
| 994 | (!irb->scsw.cc)) |
| 995 | /* FIXME: we should restart stlck here, but this |
| 996 | * is extremely unlikely ... */ |
| 997 | goto out_wakeup; |
| 998 | |
| 999 | ccw_device_accumulate_irb(cdev, irb); |
| 1000 | /* We don't care about basic sense etc. */ |
| 1001 | break; |
| 1002 | default: /* timeout */ |
| 1003 | break; |
| 1004 | } |
| 1005 | out_wakeup: |
| 1006 | wake_up(&cdev->private->wait_q); |
| 1007 | } |
| 1008 | |
| 1009 | static void |
| 1010 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) |
| 1011 | { |
| 1012 | struct subchannel *sch; |
| 1013 | |
| 1014 | sch = to_subchannel(cdev->dev.parent); |
| 1015 | if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0) |
| 1016 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
| 1017 | return; |
| 1018 | |
| 1019 | /* After 60s the device recognition is considered to have failed. */ |
| 1020 | ccw_device_set_timeout(cdev, 60*HZ); |
| 1021 | |
| 1022 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; |
| 1023 | ccw_device_sense_id_start(cdev); |
| 1024 | } |
| 1025 | |
| 1026 | void |
| 1027 | device_trigger_reprobe(struct subchannel *sch) |
| 1028 | { |
| 1029 | struct ccw_device *cdev; |
| 1030 | |
| 1031 | if (!sch->dev.driver_data) |
| 1032 | return; |
| 1033 | cdev = sch->dev.driver_data; |
| 1034 | if (cdev->private->state != DEV_STATE_DISCONNECTED) |
| 1035 | return; |
| 1036 | |
| 1037 | /* Update some values. */ |
| 1038 | if (stsch(sch->irq, &sch->schib)) |
| 1039 | return; |
| 1040 | |
| 1041 | /* |
| 1042 | * The pim, pam, pom values may not be accurate, but they are the best |
| 1043 | * we have before performing device selection :/ |
| 1044 | */ |
| 1045 | sch->lpm = sch->schib.pmcw.pim & |
| 1046 | sch->schib.pmcw.pam & |
| 1047 | sch->schib.pmcw.pom & |
| 1048 | sch->opm; |
| 1049 | /* Re-set some bits in the pmcw that were lost. */ |
| 1050 | sch->schib.pmcw.isc = 3; |
| 1051 | sch->schib.pmcw.csense = 1; |
| 1052 | sch->schib.pmcw.ena = 0; |
| 1053 | if ((sch->lpm & (sch->lpm - 1)) != 0) |
| 1054 | sch->schib.pmcw.mp = 1; |
| 1055 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; |
| 1056 | /* We should also udate ssd info, but this has to wait. */ |
| 1057 | ccw_device_start_id(cdev, 0); |
| 1058 | } |
| 1059 | |
| 1060 | static void |
| 1061 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) |
| 1062 | { |
| 1063 | struct subchannel *sch; |
| 1064 | |
| 1065 | sch = to_subchannel(cdev->dev.parent); |
| 1066 | /* |
| 1067 | * An interrupt in state offline means a previous disable was not |
| 1068 | * successful. Try again. |
| 1069 | */ |
| 1070 | cio_disable_subchannel(sch); |
| 1071 | } |
| 1072 | |
| 1073 | static void |
| 1074 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) |
| 1075 | { |
| 1076 | retry_set_schib(cdev); |
| 1077 | cdev->private->state = DEV_STATE_ONLINE; |
| 1078 | dev_fsm_event(cdev, dev_event); |
| 1079 | } |
| 1080 | |
| 1081 | |
| 1082 | static void |
| 1083 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) |
| 1084 | { |
| 1085 | ccw_device_set_timeout(cdev, 0); |
| 1086 | if (dev_event == DEV_EVENT_NOTOPER) |
| 1087 | cdev->private->state = DEV_STATE_NOT_OPER; |
| 1088 | else |
| 1089 | cdev->private->state = DEV_STATE_OFFLINE; |
| 1090 | wake_up(&cdev->private->wait_q); |
| 1091 | } |
| 1092 | |
| 1093 | static void |
| 1094 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) |
| 1095 | { |
| 1096 | int ret; |
| 1097 | |
| 1098 | ret = ccw_device_cancel_halt_clear(cdev); |
| 1099 | switch (ret) { |
| 1100 | case 0: |
| 1101 | cdev->private->state = DEV_STATE_OFFLINE; |
| 1102 | wake_up(&cdev->private->wait_q); |
| 1103 | break; |
| 1104 | case -ENODEV: |
| 1105 | cdev->private->state = DEV_STATE_NOT_OPER; |
| 1106 | wake_up(&cdev->private->wait_q); |
| 1107 | break; |
| 1108 | default: |
| 1109 | ccw_device_set_timeout(cdev, HZ/10); |
| 1110 | } |
| 1111 | } |
| 1112 | |
| 1113 | /* |
| 1114 | * No operation action. This is used e.g. to ignore a timeout event in |
| 1115 | * state offline. |
| 1116 | */ |
| 1117 | static void |
| 1118 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) |
| 1119 | { |
| 1120 | } |
| 1121 | |
| 1122 | /* |
| 1123 | * Bug operation action. |
| 1124 | */ |
| 1125 | static void |
| 1126 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) |
| 1127 | { |
| 1128 | printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n", |
| 1129 | cdev->private->state, dev_event); |
| 1130 | BUG(); |
| 1131 | } |
| 1132 | |
| 1133 | /* |
| 1134 | * device statemachine |
| 1135 | */ |
| 1136 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { |
| 1137 | [DEV_STATE_NOT_OPER] = { |
| 1138 | [DEV_EVENT_NOTOPER] = ccw_device_nop, |
| 1139 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, |
| 1140 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, |
| 1141 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1142 | }, |
| 1143 | [DEV_STATE_SENSE_PGID] = { |
| 1144 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, |
| 1145 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, |
| 1146 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, |
| 1147 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1148 | }, |
| 1149 | [DEV_STATE_SENSE_ID] = { |
| 1150 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, |
| 1151 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, |
| 1152 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, |
| 1153 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1154 | }, |
| 1155 | [DEV_STATE_OFFLINE] = { |
| 1156 | [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper, |
| 1157 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, |
| 1158 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, |
| 1159 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1160 | }, |
| 1161 | [DEV_STATE_VERIFY] = { |
| 1162 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, |
| 1163 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, |
| 1164 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, |
| 1165 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1166 | }, |
| 1167 | [DEV_STATE_ONLINE] = { |
| 1168 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, |
| 1169 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, |
| 1170 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, |
| 1171 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, |
| 1172 | }, |
| 1173 | [DEV_STATE_W4SENSE] = { |
| 1174 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, |
| 1175 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, |
| 1176 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, |
| 1177 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, |
| 1178 | }, |
| 1179 | [DEV_STATE_DISBAND_PGID] = { |
| 1180 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, |
| 1181 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, |
| 1182 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, |
| 1183 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1184 | }, |
| 1185 | [DEV_STATE_BOXED] = { |
| 1186 | [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper, |
| 1187 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, |
| 1188 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, |
| 1189 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1190 | }, |
| 1191 | /* states to wait for i/o completion before doing something */ |
| 1192 | [DEV_STATE_CLEAR_VERIFY] = { |
| 1193 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, |
| 1194 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, |
| 1195 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, |
| 1196 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1197 | }, |
| 1198 | [DEV_STATE_TIMEOUT_KILL] = { |
| 1199 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, |
| 1200 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
| 1201 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, |
| 1202 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME |
| 1203 | }, |
| 1204 | [DEV_STATE_WAIT4IO] = { |
| 1205 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, |
| 1206 | [DEV_EVENT_INTERRUPT] = ccw_device_wait4io_irq, |
| 1207 | [DEV_EVENT_TIMEOUT] = ccw_device_wait4io_timeout, |
| 1208 | [DEV_EVENT_VERIFY] = ccw_device_wait4io_verify, |
| 1209 | }, |
| 1210 | [DEV_STATE_QUIESCE] = { |
| 1211 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, |
| 1212 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, |
| 1213 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, |
| 1214 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1215 | }, |
| 1216 | /* special states for devices gone not operational */ |
| 1217 | [DEV_STATE_DISCONNECTED] = { |
| 1218 | [DEV_EVENT_NOTOPER] = ccw_device_nop, |
| 1219 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, |
| 1220 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, |
| 1221 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1222 | }, |
| 1223 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { |
| 1224 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, |
| 1225 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, |
| 1226 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, |
| 1227 | [DEV_EVENT_VERIFY] = ccw_device_nop, |
| 1228 | }, |
| 1229 | [DEV_STATE_CMFCHANGE] = { |
| 1230 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, |
| 1231 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, |
| 1232 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, |
| 1233 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, |
| 1234 | }, |
| 1235 | }; |
| 1236 | |
| 1237 | /* |
| 1238 | * io_subchannel_irq is called for "real" interrupts or for status |
| 1239 | * pending conditions on msch. |
| 1240 | */ |
| 1241 | void |
| 1242 | io_subchannel_irq (struct device *pdev) |
| 1243 | { |
| 1244 | struct ccw_device *cdev; |
| 1245 | |
| 1246 | cdev = to_subchannel(pdev)->dev.driver_data; |
| 1247 | |
| 1248 | CIO_TRACE_EVENT (3, "IRQ"); |
| 1249 | CIO_TRACE_EVENT (3, pdev->bus_id); |
| 1250 | if (cdev) |
| 1251 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); |
| 1252 | } |
| 1253 | |
| 1254 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |