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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device_fsm.c | |
3 | * finite state machine for device handling | |
4 | * | |
c820de39 | 5 | * Copyright IBM Corp. 2002,2008 |
4ce3b30c | 6 | * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
7 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
1da177e4 | 11 | #include <linux/init.h> |
4e57b681 TS |
12 | #include <linux/jiffies.h> |
13 | #include <linux/string.h> | |
1da177e4 LT |
14 | |
15 | #include <asm/ccwdev.h> | |
4c24da79 | 16 | #include <asm/cio.h> |
e5854a58 | 17 | #include <asm/chpid.h> |
1da177e4 LT |
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" | |
e6b6e10a | 25 | #include "chp.h" |
1da177e4 | 26 | |
14ff56bb SO |
27 | static int timeout_log_enabled; |
28 | ||
14ff56bb SO |
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; | |
cd6b4f27 | 41 | struct io_subchannel_private *private; |
83262d63 | 42 | union orb *orb; |
14ff56bb SO |
43 | int cc; |
44 | ||
45 | sch = to_subchannel(cdev->dev.parent); | |
cd6b4f27 | 46 | private = to_io_private(sch); |
83262d63 | 47 | orb = &private->orb; |
14ff56bb SO |
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, | |
83262d63 | 54 | orb, sizeof(*orb), 0); |
14ff56bb SO |
55 | printk(KERN_WARNING "cio: ccw device bus id: %s\n", cdev->dev.bus_id); |
56 | printk(KERN_WARNING "cio: subchannel bus id: %s\n", sch->dev.bus_id); | |
57 | printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, " | |
58 | "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm); | |
59 | ||
83262d63 PO |
60 | if (orb->tm.b) { |
61 | printk(KERN_WARNING "cio: orb indicates transport mode\n"); | |
62 | printk(KERN_WARNING "cio: last tcw:\n"); | |
63 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
64 | (void *)(addr_t)orb->tm.tcw, | |
65 | sizeof(struct tcw), 0); | |
66 | } else { | |
67 | printk(KERN_WARNING "cio: orb indicates command mode\n"); | |
68 | if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw || | |
69 | (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws) | |
70 | printk(KERN_WARNING "cio: last channel program " | |
71 | "(intern):\n"); | |
72 | else | |
73 | printk(KERN_WARNING "cio: last channel program:\n"); | |
74 | ||
75 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
76 | (void *)(addr_t)orb->cmd.cpa, | |
77 | sizeof(struct ccw1), 0); | |
78 | } | |
14ff56bb SO |
79 | printk(KERN_WARNING "cio: ccw device state: %d\n", |
80 | cdev->private->state); | |
81 | printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc); | |
82 | printk(KERN_WARNING "cio: schib:\n"); | |
83 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
84 | &schib, sizeof(schib), 0); | |
85 | printk(KERN_WARNING "cio: ccw device flags:\n"); | |
86 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
87 | &cdev->private->flags, sizeof(cdev->private->flags), 0); | |
88 | } | |
89 | ||
1da177e4 LT |
90 | /* |
91 | * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. | |
92 | */ | |
93 | static void | |
94 | ccw_device_timeout(unsigned long data) | |
95 | { | |
96 | struct ccw_device *cdev; | |
97 | ||
98 | cdev = (struct ccw_device *) data; | |
99 | spin_lock_irq(cdev->ccwlock); | |
14ff56bb SO |
100 | if (timeout_log_enabled) |
101 | ccw_timeout_log(cdev); | |
1da177e4 LT |
102 | dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); |
103 | spin_unlock_irq(cdev->ccwlock); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Set timeout | |
108 | */ | |
109 | void | |
110 | ccw_device_set_timeout(struct ccw_device *cdev, int expires) | |
111 | { | |
112 | if (expires == 0) { | |
113 | del_timer(&cdev->private->timer); | |
114 | return; | |
115 | } | |
116 | if (timer_pending(&cdev->private->timer)) { | |
117 | if (mod_timer(&cdev->private->timer, jiffies + expires)) | |
118 | return; | |
119 | } | |
120 | cdev->private->timer.function = ccw_device_timeout; | |
121 | cdev->private->timer.data = (unsigned long) cdev; | |
122 | cdev->private->timer.expires = jiffies + expires; | |
123 | add_timer(&cdev->private->timer); | |
124 | } | |
125 | ||
1da177e4 LT |
126 | /* |
127 | * Cancel running i/o. This is called repeatedly since halt/clear are | |
128 | * asynchronous operations. We do one try with cio_cancel, two tries | |
129 | * with cio_halt, 255 tries with cio_clear. If everythings fails panic. | |
130 | * Returns 0 if device now idle, -ENODEV for device not operational and | |
131 | * -EBUSY if an interrupt is expected (either from halt/clear or from a | |
132 | * status pending). | |
133 | */ | |
134 | int | |
135 | ccw_device_cancel_halt_clear(struct ccw_device *cdev) | |
136 | { | |
137 | struct subchannel *sch; | |
138 | int ret; | |
139 | ||
140 | sch = to_subchannel(cdev->dev.parent); | |
a8237fc4 | 141 | ret = stsch(sch->schid, &sch->schib); |
1da177e4 LT |
142 | if (ret || !sch->schib.pmcw.dnv) |
143 | return -ENODEV; | |
2470b648 CH |
144 | if (!sch->schib.pmcw.ena) |
145 | /* Not operational -> done. */ | |
1da177e4 LT |
146 | return 0; |
147 | /* Stage 1: cancel io. */ | |
23d805b6 PO |
148 | if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) && |
149 | !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { | |
83262d63 PO |
150 | if (!scsw_is_tm(&sch->schib.scsw)) { |
151 | ret = cio_cancel(sch); | |
152 | if (ret != -EINVAL) | |
153 | return ret; | |
154 | } | |
155 | /* cancel io unsuccessful or not applicable (transport mode). | |
156 | * Continue with asynchronous instructions. */ | |
1da177e4 LT |
157 | cdev->private->iretry = 3; /* 3 halt retries. */ |
158 | } | |
23d805b6 | 159 | if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { |
1da177e4 LT |
160 | /* Stage 2: halt io. */ |
161 | if (cdev->private->iretry) { | |
162 | cdev->private->iretry--; | |
163 | ret = cio_halt(sch); | |
ba4ba8a6 PO |
164 | if (ret != -EBUSY) |
165 | return (ret == 0) ? -EBUSY : ret; | |
1da177e4 LT |
166 | } |
167 | /* halt io unsuccessful. */ | |
168 | cdev->private->iretry = 255; /* 255 clear retries. */ | |
169 | } | |
170 | /* Stage 3: clear io. */ | |
171 | if (cdev->private->iretry) { | |
172 | cdev->private->iretry--; | |
173 | ret = cio_clear (sch); | |
174 | return (ret == 0) ? -EBUSY : ret; | |
175 | } | |
176 | panic("Can't stop i/o on subchannel.\n"); | |
177 | } | |
178 | ||
179 | static int | |
180 | ccw_device_handle_oper(struct ccw_device *cdev) | |
181 | { | |
182 | struct subchannel *sch; | |
183 | ||
184 | sch = to_subchannel(cdev->dev.parent); | |
185 | cdev->private->flags.recog_done = 1; | |
186 | /* | |
187 | * Check if cu type and device type still match. If | |
188 | * not, it is certainly another device and we have to | |
d7b5a4c9 | 189 | * de- and re-register. |
1da177e4 LT |
190 | */ |
191 | if (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 || | |
d7b5a4c9 | 194 | cdev->id.dev_model != cdev->private->senseid.dev_model) { |
1da177e4 | 195 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 196 | ccw_device_do_unreg_rereg); |
1da177e4 LT |
197 | queue_work(ccw_device_work, &cdev->private->kick_work); |
198 | return 0; | |
199 | } | |
200 | cdev->private->flags.donotify = 1; | |
201 | return 1; | |
202 | } | |
203 | ||
204 | /* | |
205 | * The machine won't give us any notification by machine check if a chpid has | |
206 | * been varied online on the SE so we have to find out by magic (i. e. driving | |
207 | * the channel subsystem to device selection and updating our path masks). | |
208 | */ | |
4d284cac | 209 | static void |
1da177e4 LT |
210 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) |
211 | { | |
212 | int mask, i; | |
f86635fa | 213 | struct chp_id chpid; |
1da177e4 | 214 | |
f86635fa | 215 | chp_id_init(&chpid); |
1da177e4 LT |
216 | for (i = 0; i<8; i++) { |
217 | mask = 0x80 >> i; | |
218 | if (!(sch->lpm & mask)) | |
219 | continue; | |
220 | if (old_lpm & mask) | |
221 | continue; | |
f86635fa | 222 | chpid.id = sch->schib.pmcw.chpid[i]; |
83b3370c PO |
223 | if (!chp_is_registered(chpid)) |
224 | css_schedule_eval_all(); | |
1da177e4 LT |
225 | } |
226 | } | |
227 | ||
228 | /* | |
229 | * Stop device recognition. | |
230 | */ | |
231 | static void | |
232 | ccw_device_recog_done(struct ccw_device *cdev, int state) | |
233 | { | |
234 | struct subchannel *sch; | |
235 | int notify, old_lpm, same_dev; | |
236 | ||
237 | sch = to_subchannel(cdev->dev.parent); | |
238 | ||
239 | ccw_device_set_timeout(cdev, 0); | |
240 | cio_disable_subchannel(sch); | |
241 | /* | |
242 | * Now that we tried recognition, we have performed device selection | |
243 | * through ssch() and the path information is up to date. | |
244 | */ | |
245 | old_lpm = sch->lpm; | |
a8237fc4 | 246 | stsch(sch->schid, &sch->schib); |
28bdc6f6 | 247 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
4ffa9234 CH |
248 | /* Check since device may again have become not operational. */ |
249 | if (!sch->schib.pmcw.dnv) | |
250 | state = DEV_STATE_NOT_OPER; | |
1da177e4 LT |
251 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) |
252 | /* Force reprobe on all chpids. */ | |
253 | old_lpm = 0; | |
254 | if (sch->lpm != old_lpm) | |
255 | __recover_lost_chpids(sch, old_lpm); | |
256 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
257 | if (state == DEV_STATE_NOT_OPER) { | |
258 | cdev->private->flags.recog_done = 1; | |
259 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
260 | return; | |
261 | } | |
262 | /* Boxed devices don't need extra treatment. */ | |
263 | } | |
264 | notify = 0; | |
265 | same_dev = 0; /* Keep the compiler quiet... */ | |
266 | switch (state) { | |
267 | case DEV_STATE_NOT_OPER: | |
139b83dd ME |
268 | CIO_MSG_EVENT(2, "SenseID : unknown device %04x on " |
269 | "subchannel 0.%x.%04x\n", | |
270 | cdev->private->dev_id.devno, | |
271 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
272 | break; |
273 | case DEV_STATE_OFFLINE: | |
274 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
275 | same_dev = ccw_device_handle_oper(cdev); | |
276 | notify = 1; | |
277 | } | |
278 | /* fill out sense information */ | |
81388d2a | 279 | memset(&cdev->id, 0, sizeof(cdev->id)); |
292888c8 HC |
280 | cdev->id.cu_type = cdev->private->senseid.cu_type; |
281 | cdev->id.cu_model = cdev->private->senseid.cu_model; | |
282 | cdev->id.dev_type = cdev->private->senseid.dev_type; | |
283 | cdev->id.dev_model = cdev->private->senseid.dev_model; | |
1da177e4 LT |
284 | if (notify) { |
285 | cdev->private->state = DEV_STATE_OFFLINE; | |
286 | if (same_dev) { | |
287 | /* Get device online again. */ | |
288 | ccw_device_online(cdev); | |
289 | wake_up(&cdev->private->wait_q); | |
290 | } | |
291 | return; | |
292 | } | |
293 | /* Issue device info message. */ | |
139b83dd ME |
294 | CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: " |
295 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " | |
296 | "%04X/%02X\n", | |
297 | cdev->private->dev_id.ssid, | |
298 | cdev->private->dev_id.devno, | |
299 | cdev->id.cu_type, cdev->id.cu_model, | |
300 | cdev->id.dev_type, cdev->id.dev_model); | |
1da177e4 LT |
301 | break; |
302 | case DEV_STATE_BOXED: | |
139b83dd ME |
303 | CIO_MSG_EVENT(0, "SenseID : boxed device %04x on " |
304 | " subchannel 0.%x.%04x\n", | |
305 | cdev->private->dev_id.devno, | |
306 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
307 | break; |
308 | } | |
309 | cdev->private->state = state; | |
310 | io_subchannel_recog_done(cdev); | |
311 | if (state != DEV_STATE_NOT_OPER) | |
312 | wake_up(&cdev->private->wait_q); | |
313 | } | |
314 | ||
315 | /* | |
316 | * Function called from device_id.c after sense id has completed. | |
317 | */ | |
318 | void | |
319 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
320 | { | |
321 | switch (err) { | |
322 | case 0: | |
323 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
324 | break; | |
325 | case -ETIME: /* Sense id stopped by timeout. */ | |
326 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
327 | break; | |
328 | default: | |
329 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
330 | break; | |
331 | } | |
332 | } | |
333 | ||
c820de39 CH |
334 | int ccw_device_notify(struct ccw_device *cdev, int event) |
335 | { | |
336 | if (!cdev->drv) | |
337 | return 0; | |
338 | if (!cdev->online) | |
339 | return 0; | |
91c36919 PO |
340 | CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", |
341 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
342 | event); | |
c820de39 CH |
343 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; |
344 | } | |
345 | ||
91c36919 | 346 | static void cmf_reenable_delayed(struct work_struct *work) |
1da177e4 | 347 | { |
c1637532 | 348 | struct ccw_device_private *priv; |
1da177e4 | 349 | struct ccw_device *cdev; |
1da177e4 | 350 | |
c1637532 MS |
351 | priv = container_of(work, struct ccw_device_private, kick_work); |
352 | cdev = priv->cdev; | |
91c36919 PO |
353 | cmf_reenable(cdev); |
354 | } | |
355 | ||
356 | static void ccw_device_oper_notify(struct ccw_device *cdev) | |
357 | { | |
358 | if (ccw_device_notify(cdev, CIO_OPER)) { | |
94bb0633 | 359 | /* Reenable channel measurements, if needed. */ |
91c36919 PO |
360 | PREPARE_WORK(&cdev->private->kick_work, cmf_reenable_delayed); |
361 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
362 | return; | |
363 | } | |
364 | /* Driver doesn't want device back. */ | |
365 | ccw_device_set_notoper(cdev); | |
366 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_do_unreg_rereg); | |
367 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
1da177e4 LT |
368 | } |
369 | ||
370 | /* | |
371 | * Finished with online/offline processing. | |
372 | */ | |
373 | static void | |
374 | ccw_device_done(struct ccw_device *cdev, int state) | |
375 | { | |
376 | struct subchannel *sch; | |
377 | ||
378 | sch = to_subchannel(cdev->dev.parent); | |
379 | ||
f1ee3281 CH |
380 | ccw_device_set_timeout(cdev, 0); |
381 | ||
1da177e4 LT |
382 | if (state != DEV_STATE_ONLINE) |
383 | cio_disable_subchannel(sch); | |
384 | ||
385 | /* Reset device status. */ | |
386 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
387 | ||
388 | cdev->private->state = state; | |
389 | ||
390 | ||
391 | if (state == DEV_STATE_BOXED) | |
139b83dd ME |
392 | CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", |
393 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
1da177e4 LT |
394 | |
395 | if (cdev->private->flags.donotify) { | |
396 | cdev->private->flags.donotify = 0; | |
91c36919 | 397 | ccw_device_oper_notify(cdev); |
1da177e4 LT |
398 | } |
399 | wake_up(&cdev->private->wait_q); | |
400 | ||
401 | if (css_init_done && state != DEV_STATE_ONLINE) | |
402 | put_device (&cdev->dev); | |
403 | } | |
404 | ||
4d284cac | 405 | static int cmp_pgid(struct pgid *p1, struct pgid *p2) |
7e560814 CH |
406 | { |
407 | char *c1; | |
408 | char *c2; | |
409 | ||
410 | c1 = (char *)p1; | |
411 | c2 = (char *)p2; | |
412 | ||
413 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
414 | } | |
415 | ||
416 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
417 | { | |
418 | int i; | |
419 | int last; | |
420 | ||
421 | last = 0; | |
422 | for (i = 0; i < 8; i++) { | |
423 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
424 | /* No PGID yet */ | |
425 | continue; | |
426 | if (cdev->private->pgid[last].inf.ps.state1 == | |
427 | SNID_STATE1_RESET) { | |
428 | /* First non-zero PGID */ | |
429 | last = i; | |
430 | continue; | |
431 | } | |
432 | if (cmp_pgid(&cdev->private->pgid[i], | |
433 | &cdev->private->pgid[last]) == 0) | |
434 | /* Non-conflicting PGIDs */ | |
435 | continue; | |
436 | ||
437 | /* PGID mismatch, can't pathgroup. */ | |
438 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
439 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
440 | cdev->private->dev_id.ssid, |
441 | cdev->private->dev_id.devno); | |
7e560814 CH |
442 | cdev->private->options.pgroup = 0; |
443 | return; | |
444 | } | |
445 | if (cdev->private->pgid[last].inf.ps.state1 == | |
446 | SNID_STATE1_RESET) | |
447 | /* No previous pgid found */ | |
7c9f4e3a CH |
448 | memcpy(&cdev->private->pgid[0], |
449 | &channel_subsystems[0]->global_pgid, | |
7e560814 CH |
450 | sizeof(struct pgid)); |
451 | else | |
452 | /* Use existing pgid */ | |
453 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
454 | sizeof(struct pgid)); | |
455 | } | |
456 | ||
1da177e4 LT |
457 | /* |
458 | * Function called from device_pgid.c after sense path ground has completed. | |
459 | */ | |
460 | void | |
461 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
462 | { | |
463 | struct subchannel *sch; | |
464 | ||
465 | sch = to_subchannel(cdev->dev.parent); | |
466 | switch (err) { | |
7e560814 CH |
467 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
468 | cdev->private->options.pgroup = 0; | |
469 | break; | |
470 | case 0: /* success */ | |
471 | case -EACCES: /* partial success, some paths not operational */ | |
472 | /* Check if all pgids are equal or 0. */ | |
473 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
474 | break; |
475 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
476 | case -EUSERS: /* device is reserved for someone else. */ | |
477 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 478 | return; |
1da177e4 LT |
479 | default: |
480 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 481 | return; |
1da177e4 | 482 | } |
7e560814 | 483 | /* Start Path Group verification. */ |
7e560814 | 484 | cdev->private->state = DEV_STATE_VERIFY; |
28bdc6f6 | 485 | cdev->private->flags.doverify = 0; |
7e560814 | 486 | ccw_device_verify_start(cdev); |
1da177e4 LT |
487 | } |
488 | ||
489 | /* | |
490 | * Start device recognition. | |
491 | */ | |
492 | int | |
493 | ccw_device_recognition(struct ccw_device *cdev) | |
494 | { | |
495 | struct subchannel *sch; | |
496 | int ret; | |
497 | ||
498 | if ((cdev->private->state != DEV_STATE_NOT_OPER) && | |
499 | (cdev->private->state != DEV_STATE_BOXED)) | |
500 | return -EINVAL; | |
501 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 502 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
503 | if (ret != 0) |
504 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
505 | return ret; | |
506 | ||
507 | /* After 60s the device recognition is considered to have failed. */ | |
508 | ccw_device_set_timeout(cdev, 60*HZ); | |
509 | ||
510 | /* | |
511 | * We used to start here with a sense pgid to find out whether a device | |
512 | * is locked by someone else. Unfortunately, the sense pgid command | |
513 | * code has other meanings on devices predating the path grouping | |
514 | * algorithm, so we start with sense id and box the device after an | |
515 | * timeout (or if sense pgid during path verification detects the device | |
516 | * is locked, as may happen on newer devices). | |
517 | */ | |
518 | cdev->private->flags.recog_done = 0; | |
519 | cdev->private->state = DEV_STATE_SENSE_ID; | |
520 | ccw_device_sense_id_start(cdev); | |
521 | return 0; | |
522 | } | |
523 | ||
524 | /* | |
525 | * Handle timeout in device recognition. | |
526 | */ | |
527 | static void | |
528 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
529 | { | |
530 | int ret; | |
531 | ||
532 | ret = ccw_device_cancel_halt_clear(cdev); | |
533 | switch (ret) { | |
534 | case 0: | |
535 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
536 | break; | |
537 | case -ENODEV: | |
538 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
539 | break; | |
540 | default: | |
541 | ccw_device_set_timeout(cdev, 3*HZ); | |
542 | } | |
543 | } | |
544 | ||
545 | ||
1da177e4 LT |
546 | void |
547 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
548 | { | |
28bdc6f6 PO |
549 | struct subchannel *sch; |
550 | ||
551 | sch = to_subchannel(cdev->dev.parent); | |
552 | /* Update schib - pom may have changed. */ | |
553 | stsch(sch->schid, &sch->schib); | |
554 | /* Update lpm with verified path mask. */ | |
555 | sch->lpm = sch->vpm; | |
556 | /* Repeat path verification? */ | |
557 | if (cdev->private->flags.doverify) { | |
558 | cdev->private->flags.doverify = 0; | |
559 | ccw_device_verify_start(cdev); | |
560 | return; | |
561 | } | |
1da177e4 LT |
562 | switch (err) { |
563 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
564 | cdev->private->options.pgroup = 0; | |
565 | case 0: | |
566 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
567 | /* Deliver fake irb to device driver, if needed. */ | |
568 | if (cdev->private->flags.fake_irb) { | |
569 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
23d805b6 PO |
570 | cdev->private->irb.scsw.cmd.cc = 1; |
571 | cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC; | |
572 | cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND; | |
573 | cdev->private->irb.scsw.cmd.stctl = | |
574 | SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
575 | cdev->private->flags.fake_irb = 0; |
576 | if (cdev->handler) | |
577 | cdev->handler(cdev, cdev->private->intparm, | |
578 | &cdev->private->irb); | |
579 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
580 | } | |
581 | break; | |
582 | case -ETIME: | |
8b42f5c2 PO |
583 | /* Reset oper notify indication after verify error. */ |
584 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
585 | ccw_device_done(cdev, DEV_STATE_BOXED); |
586 | break; | |
587 | default: | |
8b42f5c2 PO |
588 | /* Reset oper notify indication after verify error. */ |
589 | cdev->private->flags.donotify = 0; | |
46258ab5 CH |
590 | if (cdev->online) { |
591 | ccw_device_set_timeout(cdev, 0); | |
3f4cf6e7 | 592 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
46258ab5 | 593 | } else |
ee04bbcc | 594 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
1da177e4 LT |
595 | break; |
596 | } | |
597 | } | |
598 | ||
599 | /* | |
600 | * Get device online. | |
601 | */ | |
602 | int | |
603 | ccw_device_online(struct ccw_device *cdev) | |
604 | { | |
605 | struct subchannel *sch; | |
606 | int ret; | |
607 | ||
608 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
609 | (cdev->private->state != DEV_STATE_BOXED)) | |
610 | return -EINVAL; | |
611 | sch = to_subchannel(cdev->dev.parent); | |
612 | if (css_init_done && !get_device(&cdev->dev)) | |
613 | return -ENODEV; | |
edf22096 | 614 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
615 | if (ret != 0) { |
616 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
617 | if (ret == -ENODEV) | |
618 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
619 | return ret; | |
620 | } | |
621 | /* Do we want to do path grouping? */ | |
622 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
623 | /* Start initial path verification. */ |
624 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 625 | cdev->private->flags.doverify = 0; |
7e560814 | 626 | ccw_device_verify_start(cdev); |
1da177e4 LT |
627 | return 0; |
628 | } | |
629 | /* Do a SensePGID first. */ | |
630 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
631 | ccw_device_sense_pgid_start(cdev); | |
632 | return 0; | |
633 | } | |
634 | ||
635 | void | |
636 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
637 | { | |
638 | switch (err) { | |
639 | case 0: | |
640 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
641 | break; | |
642 | case -ETIME: | |
643 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
644 | break; | |
645 | default: | |
3ecb0a5a | 646 | cdev->private->flags.donotify = 0; |
3f4cf6e7 | 647 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
1da177e4 LT |
648 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
649 | break; | |
650 | } | |
651 | } | |
652 | ||
653 | /* | |
654 | * Shutdown device. | |
655 | */ | |
656 | int | |
657 | ccw_device_offline(struct ccw_device *cdev) | |
658 | { | |
659 | struct subchannel *sch; | |
660 | ||
d7b5a4c9 CH |
661 | if (ccw_device_is_orphan(cdev)) { |
662 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
663 | return 0; | |
664 | } | |
1da177e4 | 665 | sch = to_subchannel(cdev->dev.parent); |
a8237fc4 | 666 | if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv) |
1da177e4 | 667 | return -ENODEV; |
23d805b6 | 668 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 | 669 | return -EBUSY; |
23d805b6 PO |
670 | if (cdev->private->state != DEV_STATE_ONLINE) |
671 | return -EINVAL; | |
1da177e4 LT |
672 | /* Are we doing path grouping? */ |
673 | if (!cdev->private->options.pgroup) { | |
674 | /* No, set state offline immediately. */ | |
675 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
676 | return 0; | |
677 | } | |
678 | /* Start Set Path Group commands. */ | |
679 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
680 | ccw_device_disband_start(cdev); | |
681 | return 0; | |
682 | } | |
683 | ||
684 | /* | |
685 | * Handle timeout in device online/offline process. | |
686 | */ | |
687 | static void | |
688 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
689 | { | |
690 | int ret; | |
691 | ||
692 | ret = ccw_device_cancel_halt_clear(cdev); | |
693 | switch (ret) { | |
694 | case 0: | |
695 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
696 | break; | |
697 | case -ENODEV: | |
698 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
699 | break; | |
700 | default: | |
701 | ccw_device_set_timeout(cdev, 3*HZ); | |
702 | } | |
703 | } | |
704 | ||
705 | /* | |
706 | * Handle not oper event in device recognition. | |
707 | */ | |
708 | static void | |
709 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
710 | { | |
711 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
712 | } | |
713 | ||
714 | /* | |
3f4cf6e7 | 715 | * Handle not operational event in non-special state. |
1da177e4 | 716 | */ |
3f4cf6e7 CH |
717 | static void ccw_device_generic_notoper(struct ccw_device *cdev, |
718 | enum dev_event dev_event) | |
1da177e4 LT |
719 | { |
720 | struct subchannel *sch; | |
721 | ||
722 | cdev->private->state = DEV_STATE_NOT_OPER; | |
723 | sch = to_subchannel(cdev->dev.parent); | |
3f4cf6e7 | 724 | css_schedule_eval(sch->schid); |
1da177e4 LT |
725 | } |
726 | ||
727 | /* | |
728 | * Handle path verification event. | |
729 | */ | |
730 | static void | |
731 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
732 | { | |
733 | struct subchannel *sch; | |
734 | ||
1da177e4 LT |
735 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
736 | cdev->private->flags.doverify = 1; | |
737 | return; | |
738 | } | |
739 | sch = to_subchannel(cdev->dev.parent); | |
740 | /* | |
741 | * Since we might not just be coming from an interrupt from the | |
742 | * subchannel we have to update the schib. | |
743 | */ | |
a8237fc4 | 744 | stsch(sch->schid, &sch->schib); |
1da177e4 | 745 | |
23d805b6 PO |
746 | if (scsw_actl(&sch->schib.scsw) != 0 || |
747 | (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || | |
748 | (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { | |
1da177e4 LT |
749 | /* |
750 | * No final status yet or final status not yet delivered | |
751 | * to the device driver. Can't do path verfication now, | |
752 | * delay until final status was delivered. | |
753 | */ | |
754 | cdev->private->flags.doverify = 1; | |
755 | return; | |
756 | } | |
757 | /* Device is idle, we can do the path verification. */ | |
758 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 759 | cdev->private->flags.doverify = 0; |
1da177e4 LT |
760 | ccw_device_verify_start(cdev); |
761 | } | |
762 | ||
763 | /* | |
764 | * Got an interrupt for a normal io (state online). | |
765 | */ | |
766 | static void | |
767 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
768 | { | |
769 | struct irb *irb; | |
83262d63 | 770 | int is_cmd; |
1da177e4 LT |
771 | |
772 | irb = (struct irb *) __LC_IRB; | |
83262d63 | 773 | is_cmd = !scsw_is_tm(&irb->scsw); |
1da177e4 | 774 | /* Check for unsolicited interrupt. */ |
23d805b6 | 775 | if (!scsw_is_solicited(&irb->scsw)) { |
83262d63 | 776 | if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && |
1da177e4 LT |
777 | !irb->esw.esw0.erw.cons) { |
778 | /* Unit check but no sense data. Need basic sense. */ | |
779 | if (ccw_device_do_sense(cdev, irb) != 0) | |
780 | goto call_handler_unsol; | |
e0ec5749 | 781 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
782 | cdev->private->state = DEV_STATE_W4SENSE; |
783 | cdev->private->intparm = 0; | |
784 | return; | |
785 | } | |
786 | call_handler_unsol: | |
787 | if (cdev->handler) | |
788 | cdev->handler (cdev, 0, irb); | |
18374d37 CH |
789 | if (cdev->private->flags.doverify) |
790 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
791 | return; |
792 | } | |
793 | /* Accumulate status and find out if a basic sense is needed. */ | |
794 | ccw_device_accumulate_irb(cdev, irb); | |
83262d63 | 795 | if (is_cmd && cdev->private->flags.dosense) { |
1da177e4 LT |
796 | if (ccw_device_do_sense(cdev, irb) == 0) { |
797 | cdev->private->state = DEV_STATE_W4SENSE; | |
798 | } | |
799 | return; | |
800 | } | |
801 | /* Call the handler. */ | |
802 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
803 | /* Start delayed path verification. */ | |
804 | ccw_device_online_verify(cdev, 0); | |
805 | } | |
806 | ||
807 | /* | |
808 | * Got an timeout in online state. | |
809 | */ | |
810 | static void | |
811 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
812 | { | |
813 | int ret; | |
814 | ||
815 | ccw_device_set_timeout(cdev, 0); | |
816 | ret = ccw_device_cancel_halt_clear(cdev); | |
817 | if (ret == -EBUSY) { | |
818 | ccw_device_set_timeout(cdev, 3*HZ); | |
819 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
820 | return; | |
821 | } | |
3f4cf6e7 CH |
822 | if (ret == -ENODEV) |
823 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
824 | else if (cdev->handler) | |
1da177e4 LT |
825 | cdev->handler(cdev, cdev->private->intparm, |
826 | ERR_PTR(-ETIMEDOUT)); | |
827 | } | |
828 | ||
829 | /* | |
830 | * Got an interrupt for a basic sense. | |
831 | */ | |
2b67fc46 | 832 | static void |
1da177e4 LT |
833 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
834 | { | |
835 | struct irb *irb; | |
836 | ||
837 | irb = (struct irb *) __LC_IRB; | |
838 | /* Check for unsolicited interrupt. */ | |
23d805b6 PO |
839 | if (scsw_stctl(&irb->scsw) == |
840 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
841 | if (scsw_cc(&irb->scsw) == 1) | |
1da177e4 LT |
842 | /* Basic sense hasn't started. Try again. */ |
843 | ccw_device_do_sense(cdev, irb); | |
844 | else { | |
139b83dd | 845 | CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " |
e556bbbd CH |
846 | "interrupt during w4sense...\n", |
847 | cdev->private->dev_id.ssid, | |
848 | cdev->private->dev_id.devno); | |
1da177e4 LT |
849 | if (cdev->handler) |
850 | cdev->handler (cdev, 0, irb); | |
851 | } | |
852 | return; | |
853 | } | |
3ba1998e CH |
854 | /* |
855 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
856 | * only deliver the halt/clear interrupt to the device driver as if it | |
857 | * had killed the original request. | |
858 | */ | |
23d805b6 PO |
859 | if (scsw_fctl(&irb->scsw) & |
860 | (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
861 | /* Retry Basic Sense if requested. */ |
862 | if (cdev->private->flags.intretry) { | |
863 | cdev->private->flags.intretry = 0; | |
864 | ccw_device_do_sense(cdev, irb); | |
865 | return; | |
866 | } | |
3ba1998e CH |
867 | cdev->private->flags.dosense = 0; |
868 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
869 | ccw_device_accumulate_irb(cdev, irb); | |
870 | goto call_handler; | |
871 | } | |
1da177e4 LT |
872 | /* Add basic sense info to irb. */ |
873 | ccw_device_accumulate_basic_sense(cdev, irb); | |
874 | if (cdev->private->flags.dosense) { | |
875 | /* Another basic sense is needed. */ | |
876 | ccw_device_do_sense(cdev, irb); | |
877 | return; | |
878 | } | |
3ba1998e | 879 | call_handler: |
1da177e4 LT |
880 | cdev->private->state = DEV_STATE_ONLINE; |
881 | /* Call the handler. */ | |
882 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
883 | /* Start delayed path verification. */ | |
884 | ccw_device_online_verify(cdev, 0); | |
885 | } | |
886 | ||
887 | static void | |
888 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
889 | { | |
890 | struct irb *irb; | |
891 | ||
892 | irb = (struct irb *) __LC_IRB; | |
893 | /* Accumulate status. We don't do basic sense. */ | |
894 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
895 | /* Remember to clear irb to avoid residuals. */ |
896 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
897 | /* Try to start delayed device verification. */ |
898 | ccw_device_online_verify(cdev, 0); | |
899 | /* Note: Don't call handler for cio initiated clear! */ | |
900 | } | |
901 | ||
902 | static void | |
903 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
904 | { | |
905 | struct subchannel *sch; | |
906 | ||
907 | sch = to_subchannel(cdev->dev.parent); | |
908 | ccw_device_set_timeout(cdev, 0); | |
7c8427c3 CH |
909 | /* Start delayed path verification. */ |
910 | ccw_device_online_verify(cdev, 0); | |
1da177e4 | 911 | /* OK, i/o is dead now. Call interrupt handler. */ |
1da177e4 LT |
912 | if (cdev->handler) |
913 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 914 | ERR_PTR(-EIO)); |
1da177e4 LT |
915 | } |
916 | ||
917 | static void | |
918 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
919 | { | |
920 | int ret; | |
921 | ||
922 | ret = ccw_device_cancel_halt_clear(cdev); | |
923 | if (ret == -EBUSY) { | |
924 | ccw_device_set_timeout(cdev, 3*HZ); | |
925 | return; | |
926 | } | |
7c8427c3 CH |
927 | /* Start delayed path verification. */ |
928 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
929 | if (cdev->handler) |
930 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 931 | ERR_PTR(-EIO)); |
1da177e4 LT |
932 | } |
933 | ||
c820de39 | 934 | void ccw_device_kill_io(struct ccw_device *cdev) |
1da177e4 LT |
935 | { |
936 | int ret; | |
1da177e4 | 937 | |
1da177e4 LT |
938 | ret = ccw_device_cancel_halt_clear(cdev); |
939 | if (ret == -EBUSY) { | |
940 | ccw_device_set_timeout(cdev, 3*HZ); | |
941 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
942 | return; | |
943 | } | |
7c8427c3 CH |
944 | /* Start delayed path verification. */ |
945 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
946 | if (cdev->handler) |
947 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 948 | ERR_PTR(-EIO)); |
1da177e4 LT |
949 | } |
950 | ||
951 | static void | |
28bdc6f6 | 952 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 953 | { |
28bdc6f6 | 954 | /* Start verification after current task finished. */ |
7e560814 | 955 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
956 | } |
957 | ||
958 | static void | |
959 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
960 | { | |
961 | struct irb *irb; | |
962 | ||
963 | switch (dev_event) { | |
964 | case DEV_EVENT_INTERRUPT: | |
965 | irb = (struct irb *) __LC_IRB; | |
966 | /* Check for unsolicited interrupt. */ | |
23d805b6 | 967 | if ((scsw_stctl(&irb->scsw) == |
1da177e4 | 968 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && |
23d805b6 | 969 | (!scsw_cc(&irb->scsw))) |
1da177e4 LT |
970 | /* FIXME: we should restart stlck here, but this |
971 | * is extremely unlikely ... */ | |
972 | goto out_wakeup; | |
973 | ||
974 | ccw_device_accumulate_irb(cdev, irb); | |
975 | /* We don't care about basic sense etc. */ | |
976 | break; | |
977 | default: /* timeout */ | |
978 | break; | |
979 | } | |
980 | out_wakeup: | |
981 | wake_up(&cdev->private->wait_q); | |
982 | } | |
983 | ||
984 | static void | |
985 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
986 | { | |
987 | struct subchannel *sch; | |
988 | ||
989 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 990 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) |
1da177e4 LT |
991 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
992 | return; | |
993 | ||
994 | /* After 60s the device recognition is considered to have failed. */ | |
995 | ccw_device_set_timeout(cdev, 60*HZ); | |
996 | ||
997 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
998 | ccw_device_sense_id_start(cdev); | |
999 | } | |
1000 | ||
c820de39 | 1001 | void ccw_device_trigger_reprobe(struct ccw_device *cdev) |
1da177e4 | 1002 | { |
c820de39 | 1003 | struct subchannel *sch; |
1da177e4 | 1004 | |
1da177e4 LT |
1005 | if (cdev->private->state != DEV_STATE_DISCONNECTED) |
1006 | return; | |
1007 | ||
c820de39 | 1008 | sch = to_subchannel(cdev->dev.parent); |
1da177e4 | 1009 | /* Update some values. */ |
a8237fc4 | 1010 | if (stsch(sch->schid, &sch->schib)) |
1da177e4 | 1011 | return; |
7674da77 CH |
1012 | if (!sch->schib.pmcw.dnv) |
1013 | return; | |
1da177e4 LT |
1014 | /* |
1015 | * The pim, pam, pom values may not be accurate, but they are the best | |
1016 | * we have before performing device selection :/ | |
1017 | */ | |
28bdc6f6 | 1018 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 | 1019 | /* Re-set some bits in the pmcw that were lost. */ |
1da177e4 LT |
1020 | sch->schib.pmcw.csense = 1; |
1021 | sch->schib.pmcw.ena = 0; | |
1022 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1023 | sch->schib.pmcw.mp = 1; | |
1da177e4 | 1024 | /* We should also udate ssd info, but this has to wait. */ |
d7b5a4c9 CH |
1025 | /* Check if this is another device which appeared on the same sch. */ |
1026 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1027 | PREPARE_WORK(&cdev->private->kick_work, | |
1028 | ccw_device_move_to_orphanage); | |
c5d4a999 | 1029 | queue_work(slow_path_wq, &cdev->private->kick_work); |
d7b5a4c9 CH |
1030 | } else |
1031 | ccw_device_start_id(cdev, 0); | |
1da177e4 LT |
1032 | } |
1033 | ||
1034 | static void | |
1035 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1036 | { | |
1037 | struct subchannel *sch; | |
1038 | ||
1039 | sch = to_subchannel(cdev->dev.parent); | |
1040 | /* | |
1041 | * An interrupt in state offline means a previous disable was not | |
1042 | * successful. Try again. | |
1043 | */ | |
1044 | cio_disable_subchannel(sch); | |
1045 | } | |
1046 | ||
1047 | static void | |
1048 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1049 | { | |
1050 | retry_set_schib(cdev); | |
1051 | cdev->private->state = DEV_STATE_ONLINE; | |
1052 | dev_fsm_event(cdev, dev_event); | |
1053 | } | |
1054 | ||
94bb0633 CH |
1055 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1056 | enum dev_event dev_event) | |
1057 | { | |
1058 | cmf_retry_copy_block(cdev); | |
1059 | cdev->private->state = DEV_STATE_ONLINE; | |
1060 | dev_fsm_event(cdev, dev_event); | |
1061 | } | |
1da177e4 LT |
1062 | |
1063 | static void | |
1064 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1065 | { | |
1066 | ccw_device_set_timeout(cdev, 0); | |
1067 | if (dev_event == DEV_EVENT_NOTOPER) | |
1068 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1069 | else | |
1070 | cdev->private->state = DEV_STATE_OFFLINE; | |
1071 | wake_up(&cdev->private->wait_q); | |
1072 | } | |
1073 | ||
1074 | static void | |
1075 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1076 | { | |
1077 | int ret; | |
1078 | ||
1079 | ret = ccw_device_cancel_halt_clear(cdev); | |
1080 | switch (ret) { | |
1081 | case 0: | |
1082 | cdev->private->state = DEV_STATE_OFFLINE; | |
1083 | wake_up(&cdev->private->wait_q); | |
1084 | break; | |
1085 | case -ENODEV: | |
1086 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1087 | wake_up(&cdev->private->wait_q); | |
1088 | break; | |
1089 | default: | |
1090 | ccw_device_set_timeout(cdev, HZ/10); | |
1091 | } | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * No operation action. This is used e.g. to ignore a timeout event in | |
1096 | * state offline. | |
1097 | */ | |
1098 | static void | |
1099 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1100 | { | |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * Bug operation action. | |
1105 | */ | |
1106 | static void | |
1107 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1108 | { | |
139b83dd ME |
1109 | CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device " |
1110 | "0.%x.%04x\n", cdev->private->state, dev_event, | |
1111 | cdev->private->dev_id.ssid, | |
1112 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1113 | BUG(); |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * device statemachine | |
1118 | */ | |
1119 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1120 | [DEV_STATE_NOT_OPER] = { | |
1121 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1122 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1123 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1124 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1125 | }, | |
1126 | [DEV_STATE_SENSE_PGID] = { | |
3f4cf6e7 | 1127 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1128 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, |
1129 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1130 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1131 | }, | |
1132 | [DEV_STATE_SENSE_ID] = { | |
1133 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1134 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1135 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1136 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1137 | }, | |
1138 | [DEV_STATE_OFFLINE] = { | |
3f4cf6e7 | 1139 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1140 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, |
1141 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1142 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1143 | }, | |
1144 | [DEV_STATE_VERIFY] = { | |
3f4cf6e7 | 1145 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1146 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, |
1147 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1148 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1149 | }, |
1150 | [DEV_STATE_ONLINE] = { | |
3f4cf6e7 | 1151 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1152 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, |
1153 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1154 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1155 | }, | |
1156 | [DEV_STATE_W4SENSE] = { | |
3f4cf6e7 | 1157 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1158 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, |
1159 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1160 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1161 | }, | |
1162 | [DEV_STATE_DISBAND_PGID] = { | |
3f4cf6e7 | 1163 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1164 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, |
1165 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1166 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1167 | }, | |
1168 | [DEV_STATE_BOXED] = { | |
3f4cf6e7 | 1169 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1170 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, |
1171 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1172 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1173 | }, | |
1174 | /* states to wait for i/o completion before doing something */ | |
1175 | [DEV_STATE_CLEAR_VERIFY] = { | |
3f4cf6e7 | 1176 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1177 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, |
1178 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1179 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1180 | }, | |
1181 | [DEV_STATE_TIMEOUT_KILL] = { | |
3f4cf6e7 | 1182 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1183 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
1184 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1185 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1186 | }, | |
1da177e4 LT |
1187 | [DEV_STATE_QUIESCE] = { |
1188 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1189 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1190 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1191 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1192 | }, | |
1193 | /* special states for devices gone not operational */ | |
1194 | [DEV_STATE_DISCONNECTED] = { | |
1195 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1196 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1197 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
28bdc6f6 | 1198 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1199 | }, |
1200 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1201 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1202 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1203 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1204 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1205 | }, | |
1206 | [DEV_STATE_CMFCHANGE] = { | |
1207 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1208 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1209 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1210 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1211 | }, | |
94bb0633 CH |
1212 | [DEV_STATE_CMFUPDATE] = { |
1213 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1214 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1215 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1216 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1217 | }, | |
1da177e4 LT |
1218 | }; |
1219 | ||
1da177e4 | 1220 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |