Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
4ce3b30c | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
9 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
10 | */ | |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/workqueue.h> | |
20 | ||
21 | #include <asm/ccwdev.h> | |
22 | #include <asm/cio.h> | |
4e57b681 | 23 | #include <asm/param.h> /* HZ */ |
1da177e4 LT |
24 | |
25 | #include "cio.h" | |
d7b5a4c9 | 26 | #include "cio_debug.h" |
1da177e4 LT |
27 | #include "css.h" |
28 | #include "device.h" | |
29 | #include "ioasm.h" | |
30 | ||
31 | /******************* bus type handling ***********************/ | |
32 | ||
33 | /* The Linux driver model distinguishes between a bus type and | |
34 | * the bus itself. Of course we only have one channel | |
35 | * subsystem driver and one channel system per machine, but | |
36 | * we still use the abstraction. T.R. says it's a good idea. */ | |
37 | static int | |
38 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
39 | { | |
40 | struct ccw_device *cdev = to_ccwdev(dev); | |
41 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
42 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
43 | ||
44 | if (!ids) | |
45 | return 0; | |
46 | ||
47 | found = ccw_device_id_match(ids, &cdev->id); | |
48 | if (!found) | |
49 | return 0; | |
50 | ||
51 | cdev->id.driver_info = found->driver_info; | |
52 | ||
53 | return 1; | |
54 | } | |
55 | ||
db0c2d59 PO |
56 | /* Store modalias string delimited by prefix/suffix string into buffer with |
57 | * specified size. Return length of resulting string (excluding trailing '\0') | |
58 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 59 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 60 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 61 | { |
db0c2d59 | 62 | int len; |
1da177e4 | 63 | |
cfbe9bb2 | 64 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
65 | if (len > size) |
66 | return len; | |
67 | buf += len; | |
68 | size -= len; | |
1da177e4 | 69 | |
db0c2d59 PO |
70 | if (id->dev_type != 0) |
71 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
72 | id->dev_model, suffix); | |
73 | else | |
74 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 75 | |
db0c2d59 PO |
76 | return len; |
77 | } | |
78 | ||
79 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
80 | * non-zero otherwise. */ | |
81 | static int ccw_uevent(struct device *dev, char **envp, int num_envp, | |
82 | char *buffer, int buffer_size) | |
83 | { | |
84 | struct ccw_device *cdev = to_ccwdev(dev); | |
85 | struct ccw_device_id *id = &(cdev->id); | |
86 | int i = 0; | |
cfbe9bb2 CH |
87 | int len = 0; |
88 | int ret; | |
89 | char modalias_buf[30]; | |
1da177e4 | 90 | |
db0c2d59 | 91 | /* CU_TYPE= */ |
cfbe9bb2 CH |
92 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
93 | "CU_TYPE=%04X", id->cu_type); | |
94 | if (ret) | |
95 | return ret; | |
db0c2d59 PO |
96 | |
97 | /* CU_MODEL= */ | |
cfbe9bb2 CH |
98 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
99 | "CU_MODEL=%02X", id->cu_model); | |
100 | if (ret) | |
101 | return ret; | |
1da177e4 LT |
102 | |
103 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 104 | /* DEV_TYPE= */ |
cfbe9bb2 CH |
105 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
106 | "DEV_TYPE=%04X", id->dev_type); | |
107 | if (ret) | |
108 | return ret; | |
1da177e4 | 109 | |
db0c2d59 | 110 | /* DEV_MODEL= */ |
cfbe9bb2 CH |
111 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
112 | "DEV_MODEL=%02X", id->dev_model); | |
113 | if (ret) | |
114 | return ret; | |
db0c2d59 PO |
115 | |
116 | /* MODALIAS= */ | |
cfbe9bb2 CH |
117 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
118 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, | |
119 | "MODALIAS=%s", modalias_buf); | |
120 | return ret; | |
1da177e4 LT |
121 | } |
122 | ||
8bbace7e | 123 | struct bus_type ccw_bus_type; |
1da177e4 | 124 | |
8bbace7e CH |
125 | static int io_subchannel_probe (struct subchannel *); |
126 | static int io_subchannel_remove (struct subchannel *); | |
1da177e4 LT |
127 | static int io_subchannel_notify(struct device *, int); |
128 | static void io_subchannel_verify(struct device *); | |
129 | static void io_subchannel_ioterm(struct device *); | |
8bbace7e | 130 | static void io_subchannel_shutdown(struct subchannel *); |
1da177e4 LT |
131 | |
132 | struct css_driver io_subchannel_driver = { | |
133 | .subchannel_type = SUBCHANNEL_TYPE_IO, | |
134 | .drv = { | |
135 | .name = "io_subchannel", | |
136 | .bus = &css_bus_type, | |
1da177e4 LT |
137 | }, |
138 | .irq = io_subchannel_irq, | |
139 | .notify = io_subchannel_notify, | |
140 | .verify = io_subchannel_verify, | |
141 | .termination = io_subchannel_ioterm, | |
8bbace7e CH |
142 | .probe = io_subchannel_probe, |
143 | .remove = io_subchannel_remove, | |
144 | .shutdown = io_subchannel_shutdown, | |
1da177e4 LT |
145 | }; |
146 | ||
147 | struct workqueue_struct *ccw_device_work; | |
148 | struct workqueue_struct *ccw_device_notify_work; | |
40154b82 PO |
149 | wait_queue_head_t ccw_device_init_wq; |
150 | atomic_t ccw_device_init_count; | |
1da177e4 LT |
151 | |
152 | static int __init | |
153 | init_ccw_bus_type (void) | |
154 | { | |
155 | int ret; | |
156 | ||
157 | init_waitqueue_head(&ccw_device_init_wq); | |
158 | atomic_set(&ccw_device_init_count, 0); | |
159 | ||
160 | ccw_device_work = create_singlethread_workqueue("cio"); | |
161 | if (!ccw_device_work) | |
162 | return -ENOMEM; /* FIXME: better errno ? */ | |
163 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); | |
164 | if (!ccw_device_notify_work) { | |
165 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
166 | goto out_err; | |
167 | } | |
168 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); | |
169 | if (!slow_path_wq) { | |
170 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
171 | goto out_err; | |
172 | } | |
173 | if ((ret = bus_register (&ccw_bus_type))) | |
174 | goto out_err; | |
175 | ||
176 | if ((ret = driver_register(&io_subchannel_driver.drv))) | |
177 | goto out_err; | |
178 | ||
179 | wait_event(ccw_device_init_wq, | |
180 | atomic_read(&ccw_device_init_count) == 0); | |
181 | flush_workqueue(ccw_device_work); | |
182 | return 0; | |
183 | out_err: | |
184 | if (ccw_device_work) | |
185 | destroy_workqueue(ccw_device_work); | |
186 | if (ccw_device_notify_work) | |
187 | destroy_workqueue(ccw_device_notify_work); | |
188 | if (slow_path_wq) | |
189 | destroy_workqueue(slow_path_wq); | |
190 | return ret; | |
191 | } | |
192 | ||
193 | static void __exit | |
194 | cleanup_ccw_bus_type (void) | |
195 | { | |
196 | driver_unregister(&io_subchannel_driver.drv); | |
197 | bus_unregister(&ccw_bus_type); | |
198 | destroy_workqueue(ccw_device_notify_work); | |
199 | destroy_workqueue(ccw_device_work); | |
200 | } | |
201 | ||
202 | subsys_initcall(init_ccw_bus_type); | |
203 | module_exit(cleanup_ccw_bus_type); | |
204 | ||
205 | /************************ device handling **************************/ | |
206 | ||
207 | /* | |
208 | * A ccw_device has some interfaces in sysfs in addition to the | |
209 | * standard ones. | |
210 | * The following entries are designed to export the information which | |
211 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
212 | * are obvious, so they don't have an entry :) | |
213 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
214 | */ | |
215 | static ssize_t | |
3fd3c0a5 | 216 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
217 | { |
218 | struct subchannel *sch = to_subchannel(dev); | |
219 | struct ssd_info *ssd = &sch->ssd_info; | |
220 | ssize_t ret = 0; | |
221 | int chp; | |
222 | ||
32c5b050 CH |
223 | for (chp = 0; chp < 8; chp++) |
224 | ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]); | |
1da177e4 LT |
225 | ret += sprintf (buf+ret, "\n"); |
226 | return min((ssize_t)PAGE_SIZE, ret); | |
227 | } | |
228 | ||
229 | static ssize_t | |
3fd3c0a5 | 230 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
231 | { |
232 | struct subchannel *sch = to_subchannel(dev); | |
233 | struct pmcw *pmcw = &sch->schib.pmcw; | |
234 | ||
235 | return sprintf (buf, "%02x %02x %02x\n", | |
236 | pmcw->pim, pmcw->pam, pmcw->pom); | |
237 | } | |
238 | ||
239 | static ssize_t | |
3fd3c0a5 | 240 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
241 | { |
242 | struct ccw_device *cdev = to_ccwdev(dev); | |
243 | struct ccw_device_id *id = &(cdev->id); | |
244 | ||
245 | if (id->dev_type != 0) | |
246 | return sprintf(buf, "%04x/%02x\n", | |
247 | id->dev_type, id->dev_model); | |
248 | else | |
249 | return sprintf(buf, "n/a\n"); | |
250 | } | |
251 | ||
252 | static ssize_t | |
3fd3c0a5 | 253 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
254 | { |
255 | struct ccw_device *cdev = to_ccwdev(dev); | |
256 | struct ccw_device_id *id = &(cdev->id); | |
257 | ||
258 | return sprintf(buf, "%04x/%02x\n", | |
259 | id->cu_type, id->cu_model); | |
260 | } | |
261 | ||
f1fc78a8 BB |
262 | static ssize_t |
263 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
264 | { | |
265 | struct ccw_device *cdev = to_ccwdev(dev); | |
266 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 267 | int len; |
f1fc78a8 | 268 | |
cfbe9bb2 | 269 | len = snprint_alias(buf, PAGE_SIZE, id, "\n") + 1; |
db0c2d59 PO |
270 | |
271 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
272 | } |
273 | ||
1da177e4 | 274 | static ssize_t |
3fd3c0a5 | 275 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
276 | { |
277 | struct ccw_device *cdev = to_ccwdev(dev); | |
278 | ||
279 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
280 | } | |
281 | ||
d7b5a4c9 CH |
282 | int ccw_device_is_orphan(struct ccw_device *cdev) |
283 | { | |
284 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
285 | } | |
286 | ||
7674da77 CH |
287 | static void ccw_device_unregister(struct work_struct *work) |
288 | { | |
289 | struct ccw_device_private *priv; | |
290 | struct ccw_device *cdev; | |
291 | ||
292 | priv = container_of(work, struct ccw_device_private, kick_work); | |
293 | cdev = priv->cdev; | |
294 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
295 | device_unregister(&cdev->dev); | |
296 | put_device(&cdev->dev); | |
297 | } | |
298 | ||
1da177e4 LT |
299 | static void |
300 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
301 | { | |
302 | struct subchannel *sch; | |
d7b5a4c9 | 303 | unsigned long flags; |
1da177e4 LT |
304 | /* |
305 | * Forced offline in disconnected state means | |
306 | * 'throw away device'. | |
307 | */ | |
d7b5a4c9 CH |
308 | if (ccw_device_is_orphan(cdev)) { |
309 | /* Deregister ccw device. */ | |
310 | spin_lock_irqsave(cdev->ccwlock, flags); | |
311 | cdev->private->state = DEV_STATE_NOT_OPER; | |
312 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
313 | if (get_device(&cdev->dev)) { | |
314 | PREPARE_WORK(&cdev->private->kick_work, | |
315 | ccw_device_unregister); | |
316 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
317 | } | |
318 | return ; | |
319 | } | |
1da177e4 | 320 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 321 | css_sch_device_unregister(sch); |
1da177e4 LT |
322 | /* Reset intparm to zeroes. */ |
323 | sch->schib.pmcw.intparm = 0; | |
324 | cio_modify(sch); | |
325 | put_device(&sch->dev); | |
326 | } | |
327 | ||
328 | int | |
329 | ccw_device_set_offline(struct ccw_device *cdev) | |
330 | { | |
331 | int ret; | |
332 | ||
333 | if (!cdev) | |
334 | return -ENODEV; | |
335 | if (!cdev->online || !cdev->drv) | |
336 | return -EINVAL; | |
337 | ||
338 | if (cdev->drv->set_offline) { | |
339 | ret = cdev->drv->set_offline(cdev); | |
340 | if (ret != 0) | |
341 | return ret; | |
342 | } | |
343 | cdev->online = 0; | |
344 | spin_lock_irq(cdev->ccwlock); | |
345 | ret = ccw_device_offline(cdev); | |
346 | if (ret == -ENODEV) { | |
347 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
348 | cdev->private->state = DEV_STATE_OFFLINE; | |
349 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
350 | } | |
351 | spin_unlock_irq(cdev->ccwlock); | |
352 | return ret; | |
353 | } | |
354 | spin_unlock_irq(cdev->ccwlock); | |
355 | if (ret == 0) | |
356 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
357 | else { | |
358 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
359 | ret, cdev->dev.bus_id); | |
360 | cdev->online = 1; | |
361 | } | |
362 | return ret; | |
363 | } | |
364 | ||
365 | int | |
366 | ccw_device_set_online(struct ccw_device *cdev) | |
367 | { | |
368 | int ret; | |
369 | ||
370 | if (!cdev) | |
371 | return -ENODEV; | |
372 | if (cdev->online || !cdev->drv) | |
373 | return -EINVAL; | |
374 | ||
375 | spin_lock_irq(cdev->ccwlock); | |
376 | ret = ccw_device_online(cdev); | |
377 | spin_unlock_irq(cdev->ccwlock); | |
378 | if (ret == 0) | |
379 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
380 | else { | |
381 | pr_debug("ccw_device_online returned %d, device %s\n", | |
382 | ret, cdev->dev.bus_id); | |
383 | return ret; | |
384 | } | |
385 | if (cdev->private->state != DEV_STATE_ONLINE) | |
386 | return -ENODEV; | |
387 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { | |
388 | cdev->online = 1; | |
389 | return 0; | |
390 | } | |
391 | spin_lock_irq(cdev->ccwlock); | |
392 | ret = ccw_device_offline(cdev); | |
393 | spin_unlock_irq(cdev->ccwlock); | |
394 | if (ret == 0) | |
395 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
396 | else | |
397 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
398 | ret, cdev->dev.bus_id); | |
6cadb78b | 399 | return (ret == 0) ? -ENODEV : ret; |
1da177e4 LT |
400 | } |
401 | ||
f5ba6c86 CH |
402 | static void online_store_handle_offline(struct ccw_device *cdev) |
403 | { | |
404 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
405 | ccw_device_remove_disconnected(cdev); | |
406 | else if (cdev->drv && cdev->drv->set_offline) | |
407 | ccw_device_set_offline(cdev); | |
408 | } | |
409 | ||
410 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
411 | { | |
412 | int ret; | |
413 | ||
414 | /* Do device recognition, if needed. */ | |
415 | if (cdev->id.cu_type == 0) { | |
416 | ret = ccw_device_recognition(cdev); | |
417 | if (ret) { | |
418 | printk(KERN_WARNING"Couldn't start recognition " | |
419 | "for device %s (ret=%d)\n", | |
420 | cdev->dev.bus_id, ret); | |
421 | return ret; | |
422 | } | |
423 | wait_event(cdev->private->wait_q, | |
424 | cdev->private->flags.recog_done); | |
425 | } | |
426 | if (cdev->drv && cdev->drv->set_online) | |
427 | ccw_device_set_online(cdev); | |
428 | return 0; | |
429 | } | |
430 | static void online_store_handle_online(struct ccw_device *cdev, int force) | |
431 | { | |
432 | int ret; | |
433 | ||
434 | ret = online_store_recog_and_online(cdev); | |
435 | if (ret) | |
436 | return; | |
437 | if (force && cdev->private->state == DEV_STATE_BOXED) { | |
438 | ret = ccw_device_stlck(cdev); | |
439 | if (ret) { | |
440 | printk(KERN_WARNING"ccw_device_stlck for device %s " | |
441 | "returned %d!\n", cdev->dev.bus_id, ret); | |
442 | return; | |
443 | } | |
444 | if (cdev->id.cu_type == 0) | |
445 | cdev->private->state = DEV_STATE_NOT_OPER; | |
446 | online_store_recog_and_online(cdev); | |
447 | } | |
448 | ||
449 | } | |
450 | ||
451 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
452 | const char *buf, size_t count) | |
1da177e4 LT |
453 | { |
454 | struct ccw_device *cdev = to_ccwdev(dev); | |
f5ba6c86 | 455 | int i, force; |
1da177e4 LT |
456 | char *tmp; |
457 | ||
973bd993 | 458 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 LT |
459 | return -EAGAIN; |
460 | ||
461 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
462 | atomic_set(&cdev->private->onoff, 0); | |
463 | return -EINVAL; | |
464 | } | |
465 | if (!strncmp(buf, "force\n", count)) { | |
466 | force = 1; | |
467 | i = 1; | |
468 | } else { | |
469 | force = 0; | |
470 | i = simple_strtoul(buf, &tmp, 16); | |
471 | } | |
f5ba6c86 CH |
472 | |
473 | switch (i) { | |
474 | case 0: | |
475 | online_store_handle_offline(cdev); | |
476 | break; | |
477 | case 1: | |
478 | online_store_handle_online(cdev, force); | |
479 | break; | |
480 | default: | |
481 | count = -EINVAL; | |
1da177e4 | 482 | } |
1da177e4 LT |
483 | if (cdev->drv) |
484 | module_put(cdev->drv->owner); | |
485 | atomic_set(&cdev->private->onoff, 0); | |
486 | return count; | |
487 | } | |
488 | ||
489 | static ssize_t | |
3fd3c0a5 | 490 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
491 | { |
492 | struct ccw_device *cdev = to_ccwdev(dev); | |
493 | struct subchannel *sch; | |
494 | ||
d7b5a4c9 CH |
495 | if (ccw_device_is_orphan(cdev)) |
496 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
497 | switch (cdev->private->state) { |
498 | case DEV_STATE_BOXED: | |
499 | return sprintf(buf, "boxed\n"); | |
500 | case DEV_STATE_DISCONNECTED: | |
501 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
502 | case DEV_STATE_NOT_OPER: | |
503 | sch = to_subchannel(dev->parent); | |
504 | if (!sch->lpm) | |
505 | return sprintf(buf, "no path\n"); | |
506 | else | |
507 | return sprintf(buf, "no device\n"); | |
508 | default: | |
509 | /* All other states considered fine. */ | |
510 | return sprintf(buf, "good\n"); | |
511 | } | |
512 | } | |
513 | ||
514 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
515 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
516 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
517 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 518 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 LT |
519 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
520 | extern struct device_attribute dev_attr_cmb_enable; | |
521 | static DEVICE_ATTR(availability, 0444, available_show, NULL); | |
522 | ||
523 | static struct attribute * subch_attrs[] = { | |
524 | &dev_attr_chpids.attr, | |
525 | &dev_attr_pimpampom.attr, | |
526 | NULL, | |
527 | }; | |
528 | ||
529 | static struct attribute_group subch_attr_group = { | |
530 | .attrs = subch_attrs, | |
531 | }; | |
532 | ||
529192f3 CH |
533 | struct attribute_group *subch_attr_groups[] = { |
534 | &subch_attr_group, | |
535 | NULL, | |
536 | }; | |
1da177e4 LT |
537 | |
538 | static struct attribute * ccwdev_attrs[] = { | |
539 | &dev_attr_devtype.attr, | |
540 | &dev_attr_cutype.attr, | |
f1fc78a8 | 541 | &dev_attr_modalias.attr, |
1da177e4 LT |
542 | &dev_attr_online.attr, |
543 | &dev_attr_cmb_enable.attr, | |
544 | &dev_attr_availability.attr, | |
545 | NULL, | |
546 | }; | |
547 | ||
548 | static struct attribute_group ccwdev_attr_group = { | |
549 | .attrs = ccwdev_attrs, | |
550 | }; | |
551 | ||
4d284cac | 552 | static int |
1da177e4 LT |
553 | device_add_files (struct device *dev) |
554 | { | |
555 | return sysfs_create_group(&dev->kobj, &ccwdev_attr_group); | |
556 | } | |
557 | ||
4d284cac | 558 | static void |
1da177e4 LT |
559 | device_remove_files(struct device *dev) |
560 | { | |
561 | sysfs_remove_group(&dev->kobj, &ccwdev_attr_group); | |
562 | } | |
563 | ||
564 | /* this is a simple abstraction for device_register that sets the | |
565 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 566 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
567 | { |
568 | struct device *dev = &cdev->dev; | |
569 | int ret; | |
570 | ||
571 | dev->bus = &ccw_bus_type; | |
572 | ||
573 | if ((ret = device_add(dev))) | |
574 | return ret; | |
575 | ||
576 | set_bit(1, &cdev->private->registered); | |
577 | if ((ret = device_add_files(dev))) { | |
578 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
579 | device_del(dev); | |
580 | } | |
581 | return ret; | |
582 | } | |
583 | ||
b0744bd2 | 584 | struct match_data { |
78964268 | 585 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
586 | struct ccw_device * sibling; |
587 | }; | |
588 | ||
589 | static int | |
590 | match_devno(struct device * dev, void * data) | |
591 | { | |
78964268 | 592 | struct match_data * d = data; |
b0744bd2 CH |
593 | struct ccw_device * cdev; |
594 | ||
595 | cdev = to_ccwdev(dev); | |
596 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 597 | !ccw_device_is_orphan(cdev) && |
78964268 | 598 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 599 | (cdev != d->sibling)) |
b0744bd2 | 600 | return 1; |
b0744bd2 CH |
601 | return 0; |
602 | } | |
603 | ||
78964268 CH |
604 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
605 | struct ccw_device *sibling) | |
1da177e4 | 606 | { |
1da177e4 | 607 | struct device *dev; |
292888c8 | 608 | struct match_data data; |
1da177e4 | 609 | |
78964268 | 610 | data.dev_id = *dev_id; |
292888c8 | 611 | data.sibling = sibling; |
e5945b4f | 612 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 613 | |
b0744bd2 | 614 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
615 | } |
616 | ||
d7b5a4c9 CH |
617 | static int match_orphan(struct device *dev, void *data) |
618 | { | |
619 | struct ccw_dev_id *dev_id; | |
620 | struct ccw_device *cdev; | |
621 | ||
622 | dev_id = data; | |
623 | cdev = to_ccwdev(dev); | |
624 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
625 | } | |
626 | ||
627 | static struct ccw_device * | |
628 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
629 | struct ccw_dev_id *dev_id) | |
630 | { | |
631 | struct device *dev; | |
632 | ||
633 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
634 | match_orphan); | |
635 | ||
636 | return dev ? to_ccwdev(dev) : NULL; | |
637 | } | |
638 | ||
1da177e4 | 639 | static void |
c1637532 | 640 | ccw_device_add_changed(struct work_struct *work) |
1da177e4 | 641 | { |
c1637532 | 642 | struct ccw_device_private *priv; |
1da177e4 LT |
643 | struct ccw_device *cdev; |
644 | ||
c1637532 MS |
645 | priv = container_of(work, struct ccw_device_private, kick_work); |
646 | cdev = priv->cdev; | |
1da177e4 LT |
647 | if (device_add(&cdev->dev)) { |
648 | put_device(&cdev->dev); | |
649 | return; | |
650 | } | |
651 | set_bit(1, &cdev->private->registered); | |
652 | if (device_add_files(&cdev->dev)) { | |
653 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
654 | device_unregister(&cdev->dev); | |
655 | } | |
656 | } | |
657 | ||
d7b5a4c9 | 658 | void ccw_device_do_unreg_rereg(struct work_struct *work) |
1da177e4 | 659 | { |
c1637532 | 660 | struct ccw_device_private *priv; |
1da177e4 LT |
661 | struct ccw_device *cdev; |
662 | struct subchannel *sch; | |
1da177e4 | 663 | |
c1637532 MS |
664 | priv = container_of(work, struct ccw_device_private, kick_work); |
665 | cdev = priv->cdev; | |
1da177e4 | 666 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 667 | |
1da177e4 LT |
668 | device_remove_files(&cdev->dev); |
669 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
670 | device_del(&cdev->dev); | |
1da177e4 | 671 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 672 | ccw_device_add_changed); |
1da177e4 LT |
673 | queue_work(ccw_device_work, &cdev->private->kick_work); |
674 | } | |
675 | ||
676 | static void | |
677 | ccw_device_release(struct device *dev) | |
678 | { | |
679 | struct ccw_device *cdev; | |
680 | ||
681 | cdev = to_ccwdev(dev); | |
682 | kfree(cdev->private); | |
683 | kfree(cdev); | |
684 | } | |
685 | ||
7674da77 CH |
686 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
687 | { | |
688 | struct ccw_device *cdev; | |
689 | ||
690 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
691 | if (cdev) { | |
692 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
693 | GFP_KERNEL | GFP_DMA); | |
694 | if (cdev->private) | |
695 | return cdev; | |
696 | } | |
697 | kfree(cdev); | |
698 | return ERR_PTR(-ENOMEM); | |
699 | } | |
700 | ||
701 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
702 | struct ccw_device *cdev) | |
703 | { | |
704 | cdev->private->cdev = cdev; | |
705 | atomic_set(&cdev->private->onoff, 0); | |
706 | cdev->dev.parent = &sch->dev; | |
707 | cdev->dev.release = ccw_device_release; | |
708 | INIT_LIST_HEAD(&cdev->private->kick_work.entry); | |
709 | /* Do first half of device_register. */ | |
710 | device_initialize(&cdev->dev); | |
711 | if (!get_device(&sch->dev)) { | |
712 | if (cdev->dev.release) | |
713 | cdev->dev.release(&cdev->dev); | |
714 | return -ENODEV; | |
715 | } | |
716 | return 0; | |
717 | } | |
718 | ||
719 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
720 | { | |
721 | struct ccw_device *cdev; | |
722 | int ret; | |
723 | ||
724 | cdev = io_subchannel_allocate_dev(sch); | |
725 | if (!IS_ERR(cdev)) { | |
726 | ret = io_subchannel_initialize_dev(sch, cdev); | |
727 | if (ret) { | |
728 | kfree(cdev); | |
729 | cdev = ERR_PTR(ret); | |
730 | } | |
731 | } | |
732 | return cdev; | |
733 | } | |
734 | ||
d7b5a4c9 CH |
735 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
736 | ||
737 | static void sch_attach_device(struct subchannel *sch, | |
738 | struct ccw_device *cdev) | |
739 | { | |
740 | spin_lock_irq(sch->lock); | |
741 | sch->dev.driver_data = cdev; | |
742 | cdev->private->schid = sch->schid; | |
743 | cdev->ccwlock = sch->lock; | |
744 | device_trigger_reprobe(sch); | |
745 | spin_unlock_irq(sch->lock); | |
746 | } | |
747 | ||
748 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
749 | struct ccw_device *cdev) | |
750 | { | |
751 | struct subchannel *other_sch; | |
752 | int ret; | |
753 | ||
754 | other_sch = to_subchannel(get_device(cdev->dev.parent)); | |
755 | ret = device_move(&cdev->dev, &sch->dev); | |
756 | if (ret) { | |
757 | CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed " | |
758 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
759 | cdev->private->dev_id.devno, ret); | |
760 | put_device(&other_sch->dev); | |
761 | return; | |
762 | } | |
763 | other_sch->dev.driver_data = NULL; | |
764 | /* No need to keep a subchannel without ccw device around. */ | |
765 | css_sch_device_unregister(other_sch); | |
766 | put_device(&other_sch->dev); | |
767 | sch_attach_device(sch, cdev); | |
768 | } | |
769 | ||
770 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
771 | struct ccw_device *cdev) | |
772 | { | |
773 | int ret; | |
774 | ||
775 | /* Try to move the ccw device to its new subchannel. */ | |
776 | ret = device_move(&cdev->dev, &sch->dev); | |
777 | if (ret) { | |
778 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
779 | "failed (ret=%d)!\n", | |
780 | cdev->private->dev_id.ssid, | |
781 | cdev->private->dev_id.devno, ret); | |
782 | return; | |
783 | } | |
784 | sch_attach_device(sch, cdev); | |
785 | } | |
786 | ||
787 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
788 | { | |
789 | struct ccw_device *cdev; | |
790 | ||
791 | /* Need to allocate a new ccw device. */ | |
792 | cdev = io_subchannel_create_ccwdev(sch); | |
793 | if (IS_ERR(cdev)) { | |
794 | /* OK, we did everything we could... */ | |
795 | css_sch_device_unregister(sch); | |
796 | return; | |
797 | } | |
798 | spin_lock_irq(sch->lock); | |
799 | sch->dev.driver_data = cdev; | |
800 | spin_unlock_irq(sch->lock); | |
801 | /* Start recognition for the new ccw device. */ | |
802 | if (io_subchannel_recog(cdev, sch)) { | |
803 | spin_lock_irq(sch->lock); | |
804 | sch->dev.driver_data = NULL; | |
805 | spin_unlock_irq(sch->lock); | |
806 | if (cdev->dev.release) | |
807 | cdev->dev.release(&cdev->dev); | |
808 | css_sch_device_unregister(sch); | |
809 | } | |
810 | } | |
811 | ||
812 | ||
813 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
814 | { | |
815 | struct ccw_device_private *priv; | |
816 | struct ccw_device *cdev; | |
817 | struct ccw_device *replacing_cdev; | |
818 | struct subchannel *sch; | |
819 | int ret; | |
820 | struct channel_subsystem *css; | |
821 | struct ccw_dev_id dev_id; | |
822 | ||
823 | priv = container_of(work, struct ccw_device_private, kick_work); | |
824 | cdev = priv->cdev; | |
825 | sch = to_subchannel(cdev->dev.parent); | |
826 | css = to_css(sch->dev.parent); | |
827 | dev_id.devno = sch->schib.pmcw.dev; | |
828 | dev_id.ssid = sch->schid.ssid; | |
829 | ||
830 | /* | |
831 | * Move the orphaned ccw device to the orphanage so the replacing | |
832 | * ccw device can take its place on the subchannel. | |
833 | */ | |
834 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev); | |
835 | if (ret) { | |
836 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
837 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
838 | cdev->private->dev_id.devno, ret); | |
839 | return; | |
840 | } | |
841 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
842 | /* | |
843 | * Search for the replacing ccw device | |
844 | * - among the disconnected devices | |
845 | * - in the orphanage | |
846 | */ | |
847 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
848 | if (replacing_cdev) { | |
849 | sch_attach_disconnected_device(sch, replacing_cdev); | |
850 | return; | |
851 | } | |
852 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
853 | if (replacing_cdev) { | |
854 | sch_attach_orphaned_device(sch, replacing_cdev); | |
855 | return; | |
856 | } | |
857 | sch_create_and_recog_new_device(sch); | |
858 | } | |
859 | ||
1da177e4 LT |
860 | /* |
861 | * Register recognized device. | |
862 | */ | |
863 | static void | |
c1637532 | 864 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 865 | { |
c1637532 | 866 | struct ccw_device_private *priv; |
1da177e4 LT |
867 | struct ccw_device *cdev; |
868 | struct subchannel *sch; | |
869 | int ret; | |
870 | unsigned long flags; | |
871 | ||
c1637532 MS |
872 | priv = container_of(work, struct ccw_device_private, kick_work); |
873 | cdev = priv->cdev; | |
1da177e4 LT |
874 | sch = to_subchannel(cdev->dev.parent); |
875 | ||
47af5518 CH |
876 | /* |
877 | * io_subchannel_register() will also be called after device | |
878 | * recognition has been done for a boxed device (which will already | |
879 | * be registered). We need to reprobe since we may now have sense id | |
880 | * information. | |
881 | */ | |
b0744bd2 | 882 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
47af5518 CH |
883 | if (!cdev->drv) { |
884 | ret = device_reprobe(&cdev->dev); | |
885 | if (ret) | |
886 | /* We can't do much here. */ | |
887 | dev_info(&cdev->dev, "device_reprobe() returned" | |
888 | " %d\n", ret); | |
889 | } | |
1da177e4 LT |
890 | goto out; |
891 | } | |
892 | /* make it known to the system */ | |
893 | ret = ccw_device_register(cdev); | |
894 | if (ret) { | |
895 | printk (KERN_WARNING "%s: could not register %s\n", | |
896 | __func__, cdev->dev.bus_id); | |
897 | put_device(&cdev->dev); | |
2ec22984 | 898 | spin_lock_irqsave(sch->lock, flags); |
1da177e4 | 899 | sch->dev.driver_data = NULL; |
2ec22984 | 900 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
901 | kfree (cdev->private); |
902 | kfree (cdev); | |
903 | put_device(&sch->dev); | |
904 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
905 | wake_up(&ccw_device_init_wq); | |
906 | return; | |
907 | } | |
1da177e4 LT |
908 | put_device(&cdev->dev); |
909 | out: | |
910 | cdev->private->flags.recog_done = 1; | |
911 | put_device(&sch->dev); | |
912 | wake_up(&cdev->private->wait_q); | |
913 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
914 | wake_up(&ccw_device_init_wq); | |
915 | } | |
916 | ||
917 | void | |
c1637532 | 918 | ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 919 | { |
c1637532 MS |
920 | struct ccw_device_private *priv; |
921 | struct ccw_device *cdev; | |
1da177e4 LT |
922 | struct subchannel *sch; |
923 | ||
c1637532 MS |
924 | priv = container_of(work, struct ccw_device_private, kick_work); |
925 | cdev = priv->cdev; | |
1da177e4 | 926 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 927 | css_sch_device_unregister(sch); |
1da177e4 LT |
928 | /* Reset intparm to zeroes. */ |
929 | sch->schib.pmcw.intparm = 0; | |
930 | cio_modify(sch); | |
931 | put_device(&cdev->dev); | |
932 | put_device(&sch->dev); | |
933 | } | |
934 | ||
935 | /* | |
936 | * subchannel recognition done. Called from the state machine. | |
937 | */ | |
938 | void | |
939 | io_subchannel_recog_done(struct ccw_device *cdev) | |
940 | { | |
941 | struct subchannel *sch; | |
942 | ||
943 | if (css_init_done == 0) { | |
944 | cdev->private->flags.recog_done = 1; | |
945 | return; | |
946 | } | |
947 | switch (cdev->private->state) { | |
948 | case DEV_STATE_NOT_OPER: | |
949 | cdev->private->flags.recog_done = 1; | |
950 | /* Remove device found not operational. */ | |
951 | if (!get_device(&cdev->dev)) | |
952 | break; | |
953 | sch = to_subchannel(cdev->dev.parent); | |
954 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 955 | ccw_device_call_sch_unregister); |
1da177e4 LT |
956 | queue_work(slow_path_wq, &cdev->private->kick_work); |
957 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
958 | wake_up(&ccw_device_init_wq); | |
959 | break; | |
960 | case DEV_STATE_BOXED: | |
961 | /* Device did not respond in time. */ | |
962 | case DEV_STATE_OFFLINE: | |
963 | /* | |
964 | * We can't register the device in interrupt context so | |
965 | * we schedule a work item. | |
966 | */ | |
967 | if (!get_device(&cdev->dev)) | |
968 | break; | |
969 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 970 | io_subchannel_register); |
1da177e4 LT |
971 | queue_work(slow_path_wq, &cdev->private->kick_work); |
972 | break; | |
973 | } | |
974 | } | |
975 | ||
976 | static int | |
977 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
978 | { | |
979 | int rc; | |
980 | struct ccw_device_private *priv; | |
981 | ||
982 | sch->dev.driver_data = cdev; | |
983 | sch->driver = &io_subchannel_driver; | |
2ec22984 | 984 | cdev->ccwlock = sch->lock; |
fb6958a5 | 985 | |
1da177e4 LT |
986 | /* Init private data. */ |
987 | priv = cdev->private; | |
78964268 CH |
988 | priv->dev_id.devno = sch->schib.pmcw.dev; |
989 | priv->dev_id.ssid = sch->schid.ssid; | |
990 | priv->schid = sch->schid; | |
1da177e4 LT |
991 | priv->state = DEV_STATE_NOT_OPER; |
992 | INIT_LIST_HEAD(&priv->cmb_list); | |
993 | init_waitqueue_head(&priv->wait_q); | |
994 | init_timer(&priv->timer); | |
995 | ||
996 | /* Set an initial name for the device. */ | |
fb6958a5 CH |
997 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", |
998 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 LT |
999 | |
1000 | /* Increase counter of devices currently in recognition. */ | |
1001 | atomic_inc(&ccw_device_init_count); | |
1002 | ||
1003 | /* Start async. device sensing. */ | |
2ec22984 | 1004 | spin_lock_irq(sch->lock); |
1da177e4 | 1005 | rc = ccw_device_recognition(cdev); |
2ec22984 | 1006 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
1007 | if (rc) { |
1008 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1009 | wake_up(&ccw_device_init_wq); | |
1010 | } | |
1011 | return rc; | |
1012 | } | |
1013 | ||
d7b5a4c9 CH |
1014 | static void ccw_device_move_to_sch(struct work_struct *work) |
1015 | { | |
1016 | struct ccw_device_private *priv; | |
1017 | int rc; | |
1018 | struct subchannel *sch; | |
1019 | struct ccw_device *cdev; | |
1020 | struct subchannel *former_parent; | |
1021 | ||
1022 | priv = container_of(work, struct ccw_device_private, kick_work); | |
1023 | sch = priv->sch; | |
1024 | cdev = priv->cdev; | |
1025 | former_parent = ccw_device_is_orphan(cdev) ? | |
1026 | NULL : to_subchannel(get_device(cdev->dev.parent)); | |
1027 | mutex_lock(&sch->reg_mutex); | |
1028 | /* Try to move the ccw device to its new subchannel. */ | |
1029 | rc = device_move(&cdev->dev, &sch->dev); | |
1030 | mutex_unlock(&sch->reg_mutex); | |
1031 | if (rc) { | |
1032 | CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel " | |
1033 | "0.%x.%04x failed (ret=%d)!\n", | |
1034 | cdev->private->dev_id.ssid, | |
1035 | cdev->private->dev_id.devno, sch->schid.ssid, | |
1036 | sch->schid.sch_no, rc); | |
1037 | css_sch_device_unregister(sch); | |
1038 | goto out; | |
1039 | } | |
1040 | if (former_parent) { | |
1041 | spin_lock_irq(former_parent->lock); | |
1042 | former_parent->dev.driver_data = NULL; | |
1043 | spin_unlock_irq(former_parent->lock); | |
1044 | css_sch_device_unregister(former_parent); | |
1045 | /* Reset intparm to zeroes. */ | |
1046 | former_parent->schib.pmcw.intparm = 0; | |
1047 | cio_modify(former_parent); | |
1048 | } | |
1049 | sch_attach_device(sch, cdev); | |
1050 | out: | |
1051 | if (former_parent) | |
1052 | put_device(&former_parent->dev); | |
1053 | put_device(&cdev->dev); | |
1054 | } | |
1055 | ||
1da177e4 | 1056 | static int |
8bbace7e | 1057 | io_subchannel_probe (struct subchannel *sch) |
1da177e4 | 1058 | { |
1da177e4 LT |
1059 | struct ccw_device *cdev; |
1060 | int rc; | |
1061 | unsigned long flags; | |
d7b5a4c9 | 1062 | struct ccw_dev_id dev_id; |
1da177e4 | 1063 | |
1da177e4 LT |
1064 | if (sch->dev.driver_data) { |
1065 | /* | |
1066 | * This subchannel already has an associated ccw_device. | |
1067 | * Register it and exit. This happens for all early | |
1068 | * device, e.g. the console. | |
1069 | */ | |
1070 | cdev = sch->dev.driver_data; | |
1071 | device_initialize(&cdev->dev); | |
1072 | ccw_device_register(cdev); | |
1da177e4 LT |
1073 | /* |
1074 | * Check if the device is already online. If it is | |
1075 | * the reference count needs to be corrected | |
1076 | * (see ccw_device_online and css_init_done for the | |
1077 | * ugly details). | |
1078 | */ | |
1079 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1080 | cdev->private->state != DEV_STATE_OFFLINE && | |
1081 | cdev->private->state != DEV_STATE_BOXED) | |
1082 | get_device(&cdev->dev); | |
1083 | return 0; | |
1084 | } | |
d7b5a4c9 CH |
1085 | /* |
1086 | * First check if a fitting device may be found amongst the | |
1087 | * disconnected devices or in the orphanage. | |
1088 | */ | |
1089 | dev_id.devno = sch->schib.pmcw.dev; | |
1090 | dev_id.ssid = sch->schid.ssid; | |
1091 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); | |
1092 | if (!cdev) | |
1093 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1094 | &dev_id); | |
1095 | if (cdev) { | |
1096 | /* | |
1097 | * Schedule moving the device until when we have a registered | |
1098 | * subchannel to move to and succeed the probe. We can | |
1099 | * unregister later again, when the probe is through. | |
1100 | */ | |
1101 | cdev->private->sch = sch; | |
1102 | PREPARE_WORK(&cdev->private->kick_work, | |
1103 | ccw_device_move_to_sch); | |
1104 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1105 | return 0; | |
1106 | } | |
7674da77 CH |
1107 | cdev = io_subchannel_create_ccwdev(sch); |
1108 | if (IS_ERR(cdev)) | |
1109 | return PTR_ERR(cdev); | |
1da177e4 | 1110 | |
8bbace7e | 1111 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1112 | if (rc) { |
2ec22984 | 1113 | spin_lock_irqsave(sch->lock, flags); |
1da177e4 | 1114 | sch->dev.driver_data = NULL; |
2ec22984 | 1115 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
1116 | if (cdev->dev.release) |
1117 | cdev->dev.release(&cdev->dev); | |
1118 | } | |
1119 | ||
1120 | return rc; | |
1121 | } | |
1122 | ||
1da177e4 | 1123 | static int |
8bbace7e | 1124 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1125 | { |
1126 | struct ccw_device *cdev; | |
1127 | unsigned long flags; | |
1128 | ||
8bbace7e | 1129 | if (!sch->dev.driver_data) |
1da177e4 | 1130 | return 0; |
8bbace7e | 1131 | cdev = sch->dev.driver_data; |
1da177e4 LT |
1132 | /* Set ccw device to not operational and drop reference. */ |
1133 | spin_lock_irqsave(cdev->ccwlock, flags); | |
8bbace7e | 1134 | sch->dev.driver_data = NULL; |
1da177e4 LT |
1135 | cdev->private->state = DEV_STATE_NOT_OPER; |
1136 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1137 | /* | |
1138 | * Put unregistration on workqueue to avoid livelocks on the css bus | |
1139 | * semaphore. | |
1140 | */ | |
1141 | if (get_device(&cdev->dev)) { | |
1142 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1143 | ccw_device_unregister); |
1da177e4 LT |
1144 | queue_work(ccw_device_work, &cdev->private->kick_work); |
1145 | } | |
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | static int | |
1150 | io_subchannel_notify(struct device *dev, int event) | |
1151 | { | |
1152 | struct ccw_device *cdev; | |
1153 | ||
1154 | cdev = dev->driver_data; | |
1155 | if (!cdev) | |
1156 | return 0; | |
1157 | if (!cdev->drv) | |
1158 | return 0; | |
1159 | if (!cdev->online) | |
1160 | return 0; | |
1161 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; | |
1162 | } | |
1163 | ||
1164 | static void | |
1165 | io_subchannel_verify(struct device *dev) | |
1166 | { | |
1167 | struct ccw_device *cdev; | |
1168 | ||
1169 | cdev = dev->driver_data; | |
1170 | if (cdev) | |
1171 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1172 | } | |
1173 | ||
1174 | static void | |
1175 | io_subchannel_ioterm(struct device *dev) | |
1176 | { | |
1177 | struct ccw_device *cdev; | |
1178 | ||
1179 | cdev = dev->driver_data; | |
1180 | if (!cdev) | |
1181 | return; | |
d23861ff CH |
1182 | /* Internal I/O will be retried by the interrupt handler. */ |
1183 | if (cdev->private->flags.intretry) | |
1184 | return; | |
1da177e4 LT |
1185 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
1186 | if (cdev->handler) | |
1187 | cdev->handler(cdev, cdev->private->intparm, | |
1188 | ERR_PTR(-EIO)); | |
1189 | } | |
1190 | ||
1191 | static void | |
8bbace7e | 1192 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1193 | { |
1da177e4 LT |
1194 | struct ccw_device *cdev; |
1195 | int ret; | |
1196 | ||
8bbace7e | 1197 | cdev = sch->dev.driver_data; |
1da177e4 | 1198 | |
a8237fc4 | 1199 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1200 | return; |
1201 | if (!sch->schib.pmcw.ena) | |
1202 | /* Nothing to do. */ | |
1203 | return; | |
1204 | ret = cio_disable_subchannel(sch); | |
1205 | if (ret != -EBUSY) | |
1206 | /* Subchannel is disabled, we're done. */ | |
1207 | return; | |
1208 | cdev->private->state = DEV_STATE_QUIESCE; | |
1209 | if (cdev->handler) | |
1210 | cdev->handler(cdev, cdev->private->intparm, | |
1211 | ERR_PTR(-EIO)); | |
1212 | ret = ccw_device_cancel_halt_clear(cdev); | |
1213 | if (ret == -EBUSY) { | |
1214 | ccw_device_set_timeout(cdev, HZ/10); | |
1215 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1216 | } | |
1217 | cio_disable_subchannel(sch); | |
1218 | } | |
1219 | ||
1220 | #ifdef CONFIG_CCW_CONSOLE | |
1221 | static struct ccw_device console_cdev; | |
1222 | static struct ccw_device_private console_private; | |
1223 | static int console_cdev_in_use; | |
1224 | ||
2ec22984 CH |
1225 | static DEFINE_SPINLOCK(ccw_console_lock); |
1226 | ||
1227 | spinlock_t * cio_get_console_lock(void) | |
1228 | { | |
1229 | return &ccw_console_lock; | |
1230 | } | |
1231 | ||
1da177e4 LT |
1232 | static int |
1233 | ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch) | |
1234 | { | |
1235 | int rc; | |
1236 | ||
1237 | /* Initialize the ccw_device structure. */ | |
292888c8 | 1238 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1239 | rc = io_subchannel_recog(cdev, sch); |
1240 | if (rc) | |
1241 | return rc; | |
1242 | ||
1243 | /* Now wait for the async. recognition to come to an end. */ | |
1244 | spin_lock_irq(cdev->ccwlock); | |
1245 | while (!dev_fsm_final_state(cdev)) | |
1246 | wait_cons_dev(); | |
1247 | rc = -EIO; | |
1248 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1249 | goto out_unlock; | |
1250 | ccw_device_online(cdev); | |
1251 | while (!dev_fsm_final_state(cdev)) | |
1252 | wait_cons_dev(); | |
1253 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1254 | goto out_unlock; | |
1255 | rc = 0; | |
1256 | out_unlock: | |
1257 | spin_unlock_irq(cdev->ccwlock); | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | struct ccw_device * | |
1262 | ccw_device_probe_console(void) | |
1263 | { | |
1264 | struct subchannel *sch; | |
1265 | int ret; | |
1266 | ||
1267 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1268 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1269 | sch = cio_probe_console(); |
1270 | if (IS_ERR(sch)) { | |
1271 | console_cdev_in_use = 0; | |
1272 | return (void *) sch; | |
1273 | } | |
1274 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1275 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1276 | console_cdev.private = &console_private; | |
c1637532 | 1277 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1278 | ret = ccw_device_console_enable(&console_cdev, sch); |
1279 | if (ret) { | |
1280 | cio_release_console(); | |
1281 | console_cdev_in_use = 0; | |
1282 | return ERR_PTR(ret); | |
1283 | } | |
1284 | console_cdev.online = 1; | |
1285 | return &console_cdev; | |
1286 | } | |
1287 | #endif | |
1288 | ||
1289 | /* | |
1290 | * get ccw_device matching the busid, but only if owned by cdrv | |
1291 | */ | |
b0744bd2 CH |
1292 | static int |
1293 | __ccwdev_check_busid(struct device *dev, void *id) | |
1294 | { | |
1295 | char *bus_id; | |
1296 | ||
12975aef | 1297 | bus_id = id; |
b0744bd2 CH |
1298 | |
1299 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); | |
1300 | } | |
1301 | ||
1302 | ||
1da177e4 LT |
1303 | struct ccw_device * |
1304 | get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id) | |
1305 | { | |
b0744bd2 | 1306 | struct device *dev; |
1da177e4 LT |
1307 | struct device_driver *drv; |
1308 | ||
1309 | drv = get_driver(&cdrv->driver); | |
1310 | if (!drv) | |
b0744bd2 | 1311 | return NULL; |
1da177e4 | 1312 | |
b0744bd2 CH |
1313 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1314 | __ccwdev_check_busid); | |
1da177e4 LT |
1315 | put_driver(drv); |
1316 | ||
d2c993d8 | 1317 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1318 | } |
1319 | ||
1320 | /************************** device driver handling ************************/ | |
1321 | ||
1322 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1323 | * and release methods are initially very similar to the device_driver | |
1324 | * implementations, with the difference that they have ccw_device | |
1325 | * arguments. | |
1326 | * | |
1327 | * A ccw driver also contains the information that is needed for | |
1328 | * device matching. | |
1329 | */ | |
1330 | static int | |
1331 | ccw_device_probe (struct device *dev) | |
1332 | { | |
1333 | struct ccw_device *cdev = to_ccwdev(dev); | |
1334 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1335 | int ret; | |
1336 | ||
1337 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1338 | ||
1339 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1340 | ||
1341 | if (ret) { | |
d2c993d8 | 1342 | cdev->drv = NULL; |
1da177e4 LT |
1343 | return ret; |
1344 | } | |
1345 | ||
1346 | return 0; | |
1347 | } | |
1348 | ||
1349 | static int | |
1350 | ccw_device_remove (struct device *dev) | |
1351 | { | |
1352 | struct ccw_device *cdev = to_ccwdev(dev); | |
1353 | struct ccw_driver *cdrv = cdev->drv; | |
1354 | int ret; | |
1355 | ||
1356 | pr_debug("removing device %s\n", cdev->dev.bus_id); | |
1357 | if (cdrv->remove) | |
1358 | cdrv->remove(cdev); | |
1359 | if (cdev->online) { | |
1360 | cdev->online = 0; | |
1361 | spin_lock_irq(cdev->ccwlock); | |
1362 | ret = ccw_device_offline(cdev); | |
1363 | spin_unlock_irq(cdev->ccwlock); | |
1364 | if (ret == 0) | |
1365 | wait_event(cdev->private->wait_q, | |
1366 | dev_fsm_final_state(cdev)); | |
1367 | else | |
1368 | //FIXME: we can't fail! | |
1369 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
1370 | ret, cdev->dev.bus_id); | |
1371 | } | |
1372 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1373 | cdev->drv = NULL; |
1da177e4 LT |
1374 | return 0; |
1375 | } | |
1376 | ||
8bbace7e CH |
1377 | struct bus_type ccw_bus_type = { |
1378 | .name = "ccw", | |
1379 | .match = ccw_bus_match, | |
1380 | .uevent = ccw_uevent, | |
1381 | .probe = ccw_device_probe, | |
1382 | .remove = ccw_device_remove, | |
1383 | }; | |
1384 | ||
1da177e4 LT |
1385 | int |
1386 | ccw_driver_register (struct ccw_driver *cdriver) | |
1387 | { | |
1388 | struct device_driver *drv = &cdriver->driver; | |
1389 | ||
1390 | drv->bus = &ccw_bus_type; | |
1391 | drv->name = cdriver->name; | |
1da177e4 LT |
1392 | |
1393 | return driver_register(drv); | |
1394 | } | |
1395 | ||
1396 | void | |
1397 | ccw_driver_unregister (struct ccw_driver *cdriver) | |
1398 | { | |
1399 | driver_unregister(&cdriver->driver); | |
1400 | } | |
1401 | ||
a8237fc4 CH |
1402 | /* Helper func for qdio. */ |
1403 | struct subchannel_id | |
1404 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1405 | { | |
1406 | struct subchannel *sch; | |
1407 | ||
1408 | sch = to_subchannel(cdev->dev.parent); | |
1409 | return sch->schid; | |
1410 | } | |
1411 | ||
1da177e4 LT |
1412 | MODULE_LICENSE("GPL"); |
1413 | EXPORT_SYMBOL(ccw_device_set_online); | |
1414 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1415 | EXPORT_SYMBOL(ccw_driver_register); | |
1416 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1417 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1418 | EXPORT_SYMBOL(ccw_bus_type); | |
1419 | EXPORT_SYMBOL(ccw_device_work); | |
1420 | EXPORT_SYMBOL(ccw_device_notify_work); | |
a8237fc4 | 1421 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |