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Commit | Line | Data |
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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). */ | |
59 | static int snprint_alias(char *buf, size_t size, const char *prefix, | |
60 | struct ccw_device_id *id, const char *suffix) | |
1da177e4 | 61 | { |
db0c2d59 | 62 | int len; |
1da177e4 | 63 | |
db0c2d59 PO |
64 | len = snprintf(buf, size, "%sccw:t%04Xm%02X", prefix, id->cu_type, |
65 | id->cu_model); | |
66 | if (len > size) | |
67 | return len; | |
68 | buf += len; | |
69 | size -= len; | |
1da177e4 | 70 | |
db0c2d59 PO |
71 | if (id->dev_type != 0) |
72 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
73 | id->dev_model, suffix); | |
74 | else | |
75 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 76 | |
db0c2d59 PO |
77 | return len; |
78 | } | |
79 | ||
80 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
81 | * non-zero otherwise. */ | |
82 | static int ccw_uevent(struct device *dev, char **envp, int num_envp, | |
83 | char *buffer, int buffer_size) | |
84 | { | |
85 | struct ccw_device *cdev = to_ccwdev(dev); | |
86 | struct ccw_device_id *id = &(cdev->id); | |
87 | int i = 0; | |
88 | int len; | |
1da177e4 | 89 | |
db0c2d59 PO |
90 | /* CU_TYPE= */ |
91 | len = snprintf(buffer, buffer_size, "CU_TYPE=%04X", id->cu_type) + 1; | |
92 | if (len > buffer_size || i >= num_envp) | |
93 | return -ENOMEM; | |
1da177e4 | 94 | envp[i++] = buffer; |
db0c2d59 PO |
95 | buffer += len; |
96 | buffer_size -= len; | |
97 | ||
98 | /* CU_MODEL= */ | |
99 | len = snprintf(buffer, buffer_size, "CU_MODEL=%02X", id->cu_model) + 1; | |
100 | if (len > buffer_size || i >= num_envp) | |
1da177e4 | 101 | return -ENOMEM; |
db0c2d59 PO |
102 | envp[i++] = buffer; |
103 | buffer += len; | |
104 | buffer_size -= len; | |
1da177e4 LT |
105 | |
106 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 PO |
107 | /* DEV_TYPE= */ |
108 | len = snprintf(buffer, buffer_size, "DEV_TYPE=%04X", id->dev_type) + 1; | |
109 | if (len > buffer_size || i >= num_envp) | |
1da177e4 | 110 | return -ENOMEM; |
db0c2d59 PO |
111 | envp[i++] = buffer; |
112 | buffer += len; | |
113 | buffer_size -= len; | |
1da177e4 | 114 | |
db0c2d59 PO |
115 | /* DEV_MODEL= */ |
116 | len = snprintf(buffer, buffer_size, "DEV_MODEL=%02X", | |
117 | (unsigned char) id->dev_model) + 1; | |
118 | if (len > buffer_size || i >= num_envp) | |
119 | return -ENOMEM; | |
1da177e4 | 120 | envp[i++] = buffer; |
db0c2d59 PO |
121 | buffer += len; |
122 | buffer_size -= len; | |
123 | ||
124 | /* MODALIAS= */ | |
125 | len = snprint_alias(buffer, buffer_size, "MODALIAS=", id, "") + 1; | |
126 | if (len > buffer_size || i >= num_envp) | |
1da177e4 | 127 | return -ENOMEM; |
db0c2d59 PO |
128 | envp[i++] = buffer; |
129 | buffer += len; | |
130 | buffer_size -= len; | |
1da177e4 | 131 | |
d2c993d8 | 132 | envp[i] = NULL; |
1da177e4 LT |
133 | |
134 | return 0; | |
135 | } | |
136 | ||
8bbace7e | 137 | struct bus_type ccw_bus_type; |
1da177e4 | 138 | |
8bbace7e CH |
139 | static int io_subchannel_probe (struct subchannel *); |
140 | static int io_subchannel_remove (struct subchannel *); | |
1da177e4 LT |
141 | static int io_subchannel_notify(struct device *, int); |
142 | static void io_subchannel_verify(struct device *); | |
143 | static void io_subchannel_ioterm(struct device *); | |
8bbace7e | 144 | static void io_subchannel_shutdown(struct subchannel *); |
1da177e4 LT |
145 | |
146 | struct css_driver io_subchannel_driver = { | |
147 | .subchannel_type = SUBCHANNEL_TYPE_IO, | |
148 | .drv = { | |
149 | .name = "io_subchannel", | |
150 | .bus = &css_bus_type, | |
1da177e4 LT |
151 | }, |
152 | .irq = io_subchannel_irq, | |
153 | .notify = io_subchannel_notify, | |
154 | .verify = io_subchannel_verify, | |
155 | .termination = io_subchannel_ioterm, | |
8bbace7e CH |
156 | .probe = io_subchannel_probe, |
157 | .remove = io_subchannel_remove, | |
158 | .shutdown = io_subchannel_shutdown, | |
1da177e4 LT |
159 | }; |
160 | ||
161 | struct workqueue_struct *ccw_device_work; | |
162 | struct workqueue_struct *ccw_device_notify_work; | |
40154b82 PO |
163 | wait_queue_head_t ccw_device_init_wq; |
164 | atomic_t ccw_device_init_count; | |
1da177e4 LT |
165 | |
166 | static int __init | |
167 | init_ccw_bus_type (void) | |
168 | { | |
169 | int ret; | |
170 | ||
171 | init_waitqueue_head(&ccw_device_init_wq); | |
172 | atomic_set(&ccw_device_init_count, 0); | |
173 | ||
174 | ccw_device_work = create_singlethread_workqueue("cio"); | |
175 | if (!ccw_device_work) | |
176 | return -ENOMEM; /* FIXME: better errno ? */ | |
177 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); | |
178 | if (!ccw_device_notify_work) { | |
179 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
180 | goto out_err; | |
181 | } | |
182 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); | |
183 | if (!slow_path_wq) { | |
184 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
185 | goto out_err; | |
186 | } | |
187 | if ((ret = bus_register (&ccw_bus_type))) | |
188 | goto out_err; | |
189 | ||
190 | if ((ret = driver_register(&io_subchannel_driver.drv))) | |
191 | goto out_err; | |
192 | ||
193 | wait_event(ccw_device_init_wq, | |
194 | atomic_read(&ccw_device_init_count) == 0); | |
195 | flush_workqueue(ccw_device_work); | |
196 | return 0; | |
197 | out_err: | |
198 | if (ccw_device_work) | |
199 | destroy_workqueue(ccw_device_work); | |
200 | if (ccw_device_notify_work) | |
201 | destroy_workqueue(ccw_device_notify_work); | |
202 | if (slow_path_wq) | |
203 | destroy_workqueue(slow_path_wq); | |
204 | return ret; | |
205 | } | |
206 | ||
207 | static void __exit | |
208 | cleanup_ccw_bus_type (void) | |
209 | { | |
210 | driver_unregister(&io_subchannel_driver.drv); | |
211 | bus_unregister(&ccw_bus_type); | |
212 | destroy_workqueue(ccw_device_notify_work); | |
213 | destroy_workqueue(ccw_device_work); | |
214 | } | |
215 | ||
216 | subsys_initcall(init_ccw_bus_type); | |
217 | module_exit(cleanup_ccw_bus_type); | |
218 | ||
219 | /************************ device handling **************************/ | |
220 | ||
221 | /* | |
222 | * A ccw_device has some interfaces in sysfs in addition to the | |
223 | * standard ones. | |
224 | * The following entries are designed to export the information which | |
225 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
226 | * are obvious, so they don't have an entry :) | |
227 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
228 | */ | |
229 | static ssize_t | |
3fd3c0a5 | 230 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
231 | { |
232 | struct subchannel *sch = to_subchannel(dev); | |
233 | struct ssd_info *ssd = &sch->ssd_info; | |
234 | ssize_t ret = 0; | |
235 | int chp; | |
236 | ||
529192f3 CH |
237 | if (ssd) |
238 | for (chp = 0; chp < 8; chp++) | |
239 | ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]); | |
240 | else | |
241 | ret += sprintf (buf, "n/a"); | |
1da177e4 LT |
242 | ret += sprintf (buf+ret, "\n"); |
243 | return min((ssize_t)PAGE_SIZE, ret); | |
244 | } | |
245 | ||
246 | static ssize_t | |
3fd3c0a5 | 247 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
248 | { |
249 | struct subchannel *sch = to_subchannel(dev); | |
250 | struct pmcw *pmcw = &sch->schib.pmcw; | |
251 | ||
252 | return sprintf (buf, "%02x %02x %02x\n", | |
253 | pmcw->pim, pmcw->pam, pmcw->pom); | |
254 | } | |
255 | ||
256 | static ssize_t | |
3fd3c0a5 | 257 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
258 | { |
259 | struct ccw_device *cdev = to_ccwdev(dev); | |
260 | struct ccw_device_id *id = &(cdev->id); | |
261 | ||
262 | if (id->dev_type != 0) | |
263 | return sprintf(buf, "%04x/%02x\n", | |
264 | id->dev_type, id->dev_model); | |
265 | else | |
266 | return sprintf(buf, "n/a\n"); | |
267 | } | |
268 | ||
269 | static ssize_t | |
3fd3c0a5 | 270 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
271 | { |
272 | struct ccw_device *cdev = to_ccwdev(dev); | |
273 | struct ccw_device_id *id = &(cdev->id); | |
274 | ||
275 | return sprintf(buf, "%04x/%02x\n", | |
276 | id->cu_type, id->cu_model); | |
277 | } | |
278 | ||
f1fc78a8 BB |
279 | static ssize_t |
280 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
281 | { | |
282 | struct ccw_device *cdev = to_ccwdev(dev); | |
283 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 284 | int len; |
f1fc78a8 | 285 | |
db0c2d59 PO |
286 | len = snprint_alias(buf, PAGE_SIZE, "", id, "\n") + 1; |
287 | ||
288 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
289 | } |
290 | ||
1da177e4 | 291 | static ssize_t |
3fd3c0a5 | 292 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
293 | { |
294 | struct ccw_device *cdev = to_ccwdev(dev); | |
295 | ||
296 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
297 | } | |
298 | ||
d7b5a4c9 CH |
299 | int ccw_device_is_orphan(struct ccw_device *cdev) |
300 | { | |
301 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
302 | } | |
303 | ||
7674da77 CH |
304 | static void ccw_device_unregister(struct work_struct *work) |
305 | { | |
306 | struct ccw_device_private *priv; | |
307 | struct ccw_device *cdev; | |
308 | ||
309 | priv = container_of(work, struct ccw_device_private, kick_work); | |
310 | cdev = priv->cdev; | |
311 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
312 | device_unregister(&cdev->dev); | |
313 | put_device(&cdev->dev); | |
314 | } | |
315 | ||
1da177e4 LT |
316 | static void |
317 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
318 | { | |
319 | struct subchannel *sch; | |
d7b5a4c9 | 320 | unsigned long flags; |
1da177e4 LT |
321 | /* |
322 | * Forced offline in disconnected state means | |
323 | * 'throw away device'. | |
324 | */ | |
d7b5a4c9 CH |
325 | if (ccw_device_is_orphan(cdev)) { |
326 | /* Deregister ccw device. */ | |
327 | spin_lock_irqsave(cdev->ccwlock, flags); | |
328 | cdev->private->state = DEV_STATE_NOT_OPER; | |
329 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
330 | if (get_device(&cdev->dev)) { | |
331 | PREPARE_WORK(&cdev->private->kick_work, | |
332 | ccw_device_unregister); | |
333 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
334 | } | |
335 | return ; | |
336 | } | |
1da177e4 | 337 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 338 | css_sch_device_unregister(sch); |
1da177e4 LT |
339 | /* Reset intparm to zeroes. */ |
340 | sch->schib.pmcw.intparm = 0; | |
341 | cio_modify(sch); | |
342 | put_device(&sch->dev); | |
343 | } | |
344 | ||
345 | int | |
346 | ccw_device_set_offline(struct ccw_device *cdev) | |
347 | { | |
348 | int ret; | |
349 | ||
350 | if (!cdev) | |
351 | return -ENODEV; | |
352 | if (!cdev->online || !cdev->drv) | |
353 | return -EINVAL; | |
354 | ||
355 | if (cdev->drv->set_offline) { | |
356 | ret = cdev->drv->set_offline(cdev); | |
357 | if (ret != 0) | |
358 | return ret; | |
359 | } | |
360 | cdev->online = 0; | |
361 | spin_lock_irq(cdev->ccwlock); | |
362 | ret = ccw_device_offline(cdev); | |
363 | if (ret == -ENODEV) { | |
364 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
365 | cdev->private->state = DEV_STATE_OFFLINE; | |
366 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
367 | } | |
368 | spin_unlock_irq(cdev->ccwlock); | |
369 | return ret; | |
370 | } | |
371 | spin_unlock_irq(cdev->ccwlock); | |
372 | if (ret == 0) | |
373 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
374 | else { | |
375 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
376 | ret, cdev->dev.bus_id); | |
377 | cdev->online = 1; | |
378 | } | |
379 | return ret; | |
380 | } | |
381 | ||
382 | int | |
383 | ccw_device_set_online(struct ccw_device *cdev) | |
384 | { | |
385 | int ret; | |
386 | ||
387 | if (!cdev) | |
388 | return -ENODEV; | |
389 | if (cdev->online || !cdev->drv) | |
390 | return -EINVAL; | |
391 | ||
392 | spin_lock_irq(cdev->ccwlock); | |
393 | ret = ccw_device_online(cdev); | |
394 | spin_unlock_irq(cdev->ccwlock); | |
395 | if (ret == 0) | |
396 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
397 | else { | |
398 | pr_debug("ccw_device_online returned %d, device %s\n", | |
399 | ret, cdev->dev.bus_id); | |
400 | return ret; | |
401 | } | |
402 | if (cdev->private->state != DEV_STATE_ONLINE) | |
403 | return -ENODEV; | |
404 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { | |
405 | cdev->online = 1; | |
406 | return 0; | |
407 | } | |
408 | spin_lock_irq(cdev->ccwlock); | |
409 | ret = ccw_device_offline(cdev); | |
410 | spin_unlock_irq(cdev->ccwlock); | |
411 | if (ret == 0) | |
412 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
413 | else | |
414 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
415 | ret, cdev->dev.bus_id); | |
6cadb78b | 416 | return (ret == 0) ? -ENODEV : ret; |
1da177e4 LT |
417 | } |
418 | ||
419 | static ssize_t | |
3fd3c0a5 | 420 | online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
421 | { |
422 | struct ccw_device *cdev = to_ccwdev(dev); | |
423 | int i, force, ret; | |
424 | char *tmp; | |
425 | ||
973bd993 | 426 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 LT |
427 | return -EAGAIN; |
428 | ||
429 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
430 | atomic_set(&cdev->private->onoff, 0); | |
431 | return -EINVAL; | |
432 | } | |
433 | if (!strncmp(buf, "force\n", count)) { | |
434 | force = 1; | |
435 | i = 1; | |
436 | } else { | |
437 | force = 0; | |
438 | i = simple_strtoul(buf, &tmp, 16); | |
439 | } | |
440 | if (i == 1) { | |
441 | /* Do device recognition, if needed. */ | |
442 | if (cdev->id.cu_type == 0) { | |
443 | ret = ccw_device_recognition(cdev); | |
444 | if (ret) { | |
445 | printk(KERN_WARNING"Couldn't start recognition " | |
446 | "for device %s (ret=%d)\n", | |
447 | cdev->dev.bus_id, ret); | |
448 | goto out; | |
449 | } | |
450 | wait_event(cdev->private->wait_q, | |
451 | cdev->private->flags.recog_done); | |
452 | } | |
453 | if (cdev->drv && cdev->drv->set_online) | |
454 | ccw_device_set_online(cdev); | |
455 | } else if (i == 0) { | |
456 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
457 | ccw_device_remove_disconnected(cdev); | |
458 | else if (cdev->drv && cdev->drv->set_offline) | |
459 | ccw_device_set_offline(cdev); | |
460 | } | |
461 | if (force && cdev->private->state == DEV_STATE_BOXED) { | |
462 | ret = ccw_device_stlck(cdev); | |
463 | if (ret) { | |
464 | printk(KERN_WARNING"ccw_device_stlck for device %s " | |
465 | "returned %d!\n", cdev->dev.bus_id, ret); | |
466 | goto out; | |
467 | } | |
468 | /* Do device recognition, if needed. */ | |
469 | if (cdev->id.cu_type == 0) { | |
470 | cdev->private->state = DEV_STATE_NOT_OPER; | |
471 | ret = ccw_device_recognition(cdev); | |
472 | if (ret) { | |
473 | printk(KERN_WARNING"Couldn't start recognition " | |
474 | "for device %s (ret=%d)\n", | |
475 | cdev->dev.bus_id, ret); | |
476 | goto out; | |
477 | } | |
478 | wait_event(cdev->private->wait_q, | |
479 | cdev->private->flags.recog_done); | |
480 | } | |
481 | if (cdev->drv && cdev->drv->set_online) | |
482 | ccw_device_set_online(cdev); | |
483 | } | |
484 | out: | |
485 | if (cdev->drv) | |
486 | module_put(cdev->drv->owner); | |
487 | atomic_set(&cdev->private->onoff, 0); | |
488 | return count; | |
489 | } | |
490 | ||
491 | static ssize_t | |
3fd3c0a5 | 492 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
493 | { |
494 | struct ccw_device *cdev = to_ccwdev(dev); | |
495 | struct subchannel *sch; | |
496 | ||
d7b5a4c9 CH |
497 | if (ccw_device_is_orphan(cdev)) |
498 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
499 | switch (cdev->private->state) { |
500 | case DEV_STATE_BOXED: | |
501 | return sprintf(buf, "boxed\n"); | |
502 | case DEV_STATE_DISCONNECTED: | |
503 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
504 | case DEV_STATE_NOT_OPER: | |
505 | sch = to_subchannel(dev->parent); | |
506 | if (!sch->lpm) | |
507 | return sprintf(buf, "no path\n"); | |
508 | else | |
509 | return sprintf(buf, "no device\n"); | |
510 | default: | |
511 | /* All other states considered fine. */ | |
512 | return sprintf(buf, "good\n"); | |
513 | } | |
514 | } | |
515 | ||
516 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
517 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
518 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
519 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 520 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 LT |
521 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
522 | extern struct device_attribute dev_attr_cmb_enable; | |
523 | static DEVICE_ATTR(availability, 0444, available_show, NULL); | |
524 | ||
525 | static struct attribute * subch_attrs[] = { | |
526 | &dev_attr_chpids.attr, | |
527 | &dev_attr_pimpampom.attr, | |
528 | NULL, | |
529 | }; | |
530 | ||
531 | static struct attribute_group subch_attr_group = { | |
532 | .attrs = subch_attrs, | |
533 | }; | |
534 | ||
529192f3 CH |
535 | struct attribute_group *subch_attr_groups[] = { |
536 | &subch_attr_group, | |
537 | NULL, | |
538 | }; | |
1da177e4 LT |
539 | |
540 | static struct attribute * ccwdev_attrs[] = { | |
541 | &dev_attr_devtype.attr, | |
542 | &dev_attr_cutype.attr, | |
f1fc78a8 | 543 | &dev_attr_modalias.attr, |
1da177e4 LT |
544 | &dev_attr_online.attr, |
545 | &dev_attr_cmb_enable.attr, | |
546 | &dev_attr_availability.attr, | |
547 | NULL, | |
548 | }; | |
549 | ||
550 | static struct attribute_group ccwdev_attr_group = { | |
551 | .attrs = ccwdev_attrs, | |
552 | }; | |
553 | ||
554 | static inline int | |
555 | device_add_files (struct device *dev) | |
556 | { | |
557 | return sysfs_create_group(&dev->kobj, &ccwdev_attr_group); | |
558 | } | |
559 | ||
560 | static inline void | |
561 | device_remove_files(struct device *dev) | |
562 | { | |
563 | sysfs_remove_group(&dev->kobj, &ccwdev_attr_group); | |
564 | } | |
565 | ||
566 | /* this is a simple abstraction for device_register that sets the | |
567 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 568 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
569 | { |
570 | struct device *dev = &cdev->dev; | |
571 | int ret; | |
572 | ||
573 | dev->bus = &ccw_bus_type; | |
574 | ||
575 | if ((ret = device_add(dev))) | |
576 | return ret; | |
577 | ||
578 | set_bit(1, &cdev->private->registered); | |
579 | if ((ret = device_add_files(dev))) { | |
580 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
581 | device_del(dev); | |
582 | } | |
583 | return ret; | |
584 | } | |
585 | ||
b0744bd2 | 586 | struct match_data { |
78964268 | 587 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
588 | struct ccw_device * sibling; |
589 | }; | |
590 | ||
591 | static int | |
592 | match_devno(struct device * dev, void * data) | |
593 | { | |
78964268 | 594 | struct match_data * d = data; |
b0744bd2 CH |
595 | struct ccw_device * cdev; |
596 | ||
597 | cdev = to_ccwdev(dev); | |
598 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 599 | !ccw_device_is_orphan(cdev) && |
78964268 | 600 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 601 | (cdev != d->sibling)) |
b0744bd2 | 602 | return 1; |
b0744bd2 CH |
603 | return 0; |
604 | } | |
605 | ||
78964268 CH |
606 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
607 | struct ccw_device *sibling) | |
1da177e4 | 608 | { |
1da177e4 | 609 | struct device *dev; |
292888c8 | 610 | struct match_data data; |
1da177e4 | 611 | |
78964268 | 612 | data.dev_id = *dev_id; |
292888c8 | 613 | data.sibling = sibling; |
e5945b4f | 614 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 615 | |
b0744bd2 | 616 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
617 | } |
618 | ||
d7b5a4c9 CH |
619 | static int match_orphan(struct device *dev, void *data) |
620 | { | |
621 | struct ccw_dev_id *dev_id; | |
622 | struct ccw_device *cdev; | |
623 | ||
624 | dev_id = data; | |
625 | cdev = to_ccwdev(dev); | |
626 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
627 | } | |
628 | ||
629 | static struct ccw_device * | |
630 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
631 | struct ccw_dev_id *dev_id) | |
632 | { | |
633 | struct device *dev; | |
634 | ||
635 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
636 | match_orphan); | |
637 | ||
638 | return dev ? to_ccwdev(dev) : NULL; | |
639 | } | |
640 | ||
1da177e4 | 641 | static void |
c1637532 | 642 | ccw_device_add_changed(struct work_struct *work) |
1da177e4 | 643 | { |
c1637532 | 644 | struct ccw_device_private *priv; |
1da177e4 LT |
645 | struct ccw_device *cdev; |
646 | ||
c1637532 MS |
647 | priv = container_of(work, struct ccw_device_private, kick_work); |
648 | cdev = priv->cdev; | |
1da177e4 LT |
649 | if (device_add(&cdev->dev)) { |
650 | put_device(&cdev->dev); | |
651 | return; | |
652 | } | |
653 | set_bit(1, &cdev->private->registered); | |
654 | if (device_add_files(&cdev->dev)) { | |
655 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
656 | device_unregister(&cdev->dev); | |
657 | } | |
658 | } | |
659 | ||
d7b5a4c9 | 660 | void ccw_device_do_unreg_rereg(struct work_struct *work) |
1da177e4 | 661 | { |
c1637532 | 662 | struct ccw_device_private *priv; |
1da177e4 LT |
663 | struct ccw_device *cdev; |
664 | struct subchannel *sch; | |
1da177e4 | 665 | |
c1637532 MS |
666 | priv = container_of(work, struct ccw_device_private, kick_work); |
667 | cdev = priv->cdev; | |
1da177e4 | 668 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 669 | |
1da177e4 LT |
670 | device_remove_files(&cdev->dev); |
671 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
672 | device_del(&cdev->dev); | |
1da177e4 | 673 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 674 | ccw_device_add_changed); |
1da177e4 LT |
675 | queue_work(ccw_device_work, &cdev->private->kick_work); |
676 | } | |
677 | ||
678 | static void | |
679 | ccw_device_release(struct device *dev) | |
680 | { | |
681 | struct ccw_device *cdev; | |
682 | ||
683 | cdev = to_ccwdev(dev); | |
684 | kfree(cdev->private); | |
685 | kfree(cdev); | |
686 | } | |
687 | ||
7674da77 CH |
688 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
689 | { | |
690 | struct ccw_device *cdev; | |
691 | ||
692 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
693 | if (cdev) { | |
694 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
695 | GFP_KERNEL | GFP_DMA); | |
696 | if (cdev->private) | |
697 | return cdev; | |
698 | } | |
699 | kfree(cdev); | |
700 | return ERR_PTR(-ENOMEM); | |
701 | } | |
702 | ||
703 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
704 | struct ccw_device *cdev) | |
705 | { | |
706 | cdev->private->cdev = cdev; | |
707 | atomic_set(&cdev->private->onoff, 0); | |
708 | cdev->dev.parent = &sch->dev; | |
709 | cdev->dev.release = ccw_device_release; | |
710 | INIT_LIST_HEAD(&cdev->private->kick_work.entry); | |
711 | /* Do first half of device_register. */ | |
712 | device_initialize(&cdev->dev); | |
713 | if (!get_device(&sch->dev)) { | |
714 | if (cdev->dev.release) | |
715 | cdev->dev.release(&cdev->dev); | |
716 | return -ENODEV; | |
717 | } | |
718 | return 0; | |
719 | } | |
720 | ||
721 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
722 | { | |
723 | struct ccw_device *cdev; | |
724 | int ret; | |
725 | ||
726 | cdev = io_subchannel_allocate_dev(sch); | |
727 | if (!IS_ERR(cdev)) { | |
728 | ret = io_subchannel_initialize_dev(sch, cdev); | |
729 | if (ret) { | |
730 | kfree(cdev); | |
731 | cdev = ERR_PTR(ret); | |
732 | } | |
733 | } | |
734 | return cdev; | |
735 | } | |
736 | ||
d7b5a4c9 CH |
737 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
738 | ||
739 | static void sch_attach_device(struct subchannel *sch, | |
740 | struct ccw_device *cdev) | |
741 | { | |
742 | spin_lock_irq(sch->lock); | |
743 | sch->dev.driver_data = cdev; | |
744 | cdev->private->schid = sch->schid; | |
745 | cdev->ccwlock = sch->lock; | |
746 | device_trigger_reprobe(sch); | |
747 | spin_unlock_irq(sch->lock); | |
748 | } | |
749 | ||
750 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
751 | struct ccw_device *cdev) | |
752 | { | |
753 | struct subchannel *other_sch; | |
754 | int ret; | |
755 | ||
756 | other_sch = to_subchannel(get_device(cdev->dev.parent)); | |
757 | ret = device_move(&cdev->dev, &sch->dev); | |
758 | if (ret) { | |
759 | CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed " | |
760 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
761 | cdev->private->dev_id.devno, ret); | |
762 | put_device(&other_sch->dev); | |
763 | return; | |
764 | } | |
765 | other_sch->dev.driver_data = NULL; | |
766 | /* No need to keep a subchannel without ccw device around. */ | |
767 | css_sch_device_unregister(other_sch); | |
768 | put_device(&other_sch->dev); | |
769 | sch_attach_device(sch, cdev); | |
770 | } | |
771 | ||
772 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
773 | struct ccw_device *cdev) | |
774 | { | |
775 | int ret; | |
776 | ||
777 | /* Try to move the ccw device to its new subchannel. */ | |
778 | ret = device_move(&cdev->dev, &sch->dev); | |
779 | if (ret) { | |
780 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
781 | "failed (ret=%d)!\n", | |
782 | cdev->private->dev_id.ssid, | |
783 | cdev->private->dev_id.devno, ret); | |
784 | return; | |
785 | } | |
786 | sch_attach_device(sch, cdev); | |
787 | } | |
788 | ||
789 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
790 | { | |
791 | struct ccw_device *cdev; | |
792 | ||
793 | /* Need to allocate a new ccw device. */ | |
794 | cdev = io_subchannel_create_ccwdev(sch); | |
795 | if (IS_ERR(cdev)) { | |
796 | /* OK, we did everything we could... */ | |
797 | css_sch_device_unregister(sch); | |
798 | return; | |
799 | } | |
800 | spin_lock_irq(sch->lock); | |
801 | sch->dev.driver_data = cdev; | |
802 | spin_unlock_irq(sch->lock); | |
803 | /* Start recognition for the new ccw device. */ | |
804 | if (io_subchannel_recog(cdev, sch)) { | |
805 | spin_lock_irq(sch->lock); | |
806 | sch->dev.driver_data = NULL; | |
807 | spin_unlock_irq(sch->lock); | |
808 | if (cdev->dev.release) | |
809 | cdev->dev.release(&cdev->dev); | |
810 | css_sch_device_unregister(sch); | |
811 | } | |
812 | } | |
813 | ||
814 | ||
815 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
816 | { | |
817 | struct ccw_device_private *priv; | |
818 | struct ccw_device *cdev; | |
819 | struct ccw_device *replacing_cdev; | |
820 | struct subchannel *sch; | |
821 | int ret; | |
822 | struct channel_subsystem *css; | |
823 | struct ccw_dev_id dev_id; | |
824 | ||
825 | priv = container_of(work, struct ccw_device_private, kick_work); | |
826 | cdev = priv->cdev; | |
827 | sch = to_subchannel(cdev->dev.parent); | |
828 | css = to_css(sch->dev.parent); | |
829 | dev_id.devno = sch->schib.pmcw.dev; | |
830 | dev_id.ssid = sch->schid.ssid; | |
831 | ||
832 | /* | |
833 | * Move the orphaned ccw device to the orphanage so the replacing | |
834 | * ccw device can take its place on the subchannel. | |
835 | */ | |
836 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev); | |
837 | if (ret) { | |
838 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
839 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
840 | cdev->private->dev_id.devno, ret); | |
841 | return; | |
842 | } | |
843 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
844 | /* | |
845 | * Search for the replacing ccw device | |
846 | * - among the disconnected devices | |
847 | * - in the orphanage | |
848 | */ | |
849 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
850 | if (replacing_cdev) { | |
851 | sch_attach_disconnected_device(sch, replacing_cdev); | |
852 | return; | |
853 | } | |
854 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
855 | if (replacing_cdev) { | |
856 | sch_attach_orphaned_device(sch, replacing_cdev); | |
857 | return; | |
858 | } | |
859 | sch_create_and_recog_new_device(sch); | |
860 | } | |
861 | ||
1da177e4 LT |
862 | /* |
863 | * Register recognized device. | |
864 | */ | |
865 | static void | |
c1637532 | 866 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 867 | { |
c1637532 | 868 | struct ccw_device_private *priv; |
1da177e4 LT |
869 | struct ccw_device *cdev; |
870 | struct subchannel *sch; | |
871 | int ret; | |
872 | unsigned long flags; | |
873 | ||
c1637532 MS |
874 | priv = container_of(work, struct ccw_device_private, kick_work); |
875 | cdev = priv->cdev; | |
1da177e4 LT |
876 | sch = to_subchannel(cdev->dev.parent); |
877 | ||
47af5518 CH |
878 | /* |
879 | * io_subchannel_register() will also be called after device | |
880 | * recognition has been done for a boxed device (which will already | |
881 | * be registered). We need to reprobe since we may now have sense id | |
882 | * information. | |
883 | */ | |
b0744bd2 | 884 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
47af5518 CH |
885 | if (!cdev->drv) { |
886 | ret = device_reprobe(&cdev->dev); | |
887 | if (ret) | |
888 | /* We can't do much here. */ | |
889 | dev_info(&cdev->dev, "device_reprobe() returned" | |
890 | " %d\n", ret); | |
891 | } | |
1da177e4 LT |
892 | goto out; |
893 | } | |
894 | /* make it known to the system */ | |
895 | ret = ccw_device_register(cdev); | |
896 | if (ret) { | |
897 | printk (KERN_WARNING "%s: could not register %s\n", | |
898 | __func__, cdev->dev.bus_id); | |
899 | put_device(&cdev->dev); | |
2ec22984 | 900 | spin_lock_irqsave(sch->lock, flags); |
1da177e4 | 901 | sch->dev.driver_data = NULL; |
2ec22984 | 902 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
903 | kfree (cdev->private); |
904 | kfree (cdev); | |
905 | put_device(&sch->dev); | |
906 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
907 | wake_up(&ccw_device_init_wq); | |
908 | return; | |
909 | } | |
1da177e4 LT |
910 | put_device(&cdev->dev); |
911 | out: | |
912 | cdev->private->flags.recog_done = 1; | |
913 | put_device(&sch->dev); | |
914 | wake_up(&cdev->private->wait_q); | |
915 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
916 | wake_up(&ccw_device_init_wq); | |
917 | } | |
918 | ||
919 | void | |
c1637532 | 920 | ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 921 | { |
c1637532 MS |
922 | struct ccw_device_private *priv; |
923 | struct ccw_device *cdev; | |
1da177e4 LT |
924 | struct subchannel *sch; |
925 | ||
c1637532 MS |
926 | priv = container_of(work, struct ccw_device_private, kick_work); |
927 | cdev = priv->cdev; | |
1da177e4 | 928 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 929 | css_sch_device_unregister(sch); |
1da177e4 LT |
930 | /* Reset intparm to zeroes. */ |
931 | sch->schib.pmcw.intparm = 0; | |
932 | cio_modify(sch); | |
933 | put_device(&cdev->dev); | |
934 | put_device(&sch->dev); | |
935 | } | |
936 | ||
937 | /* | |
938 | * subchannel recognition done. Called from the state machine. | |
939 | */ | |
940 | void | |
941 | io_subchannel_recog_done(struct ccw_device *cdev) | |
942 | { | |
943 | struct subchannel *sch; | |
944 | ||
945 | if (css_init_done == 0) { | |
946 | cdev->private->flags.recog_done = 1; | |
947 | return; | |
948 | } | |
949 | switch (cdev->private->state) { | |
950 | case DEV_STATE_NOT_OPER: | |
951 | cdev->private->flags.recog_done = 1; | |
952 | /* Remove device found not operational. */ | |
953 | if (!get_device(&cdev->dev)) | |
954 | break; | |
955 | sch = to_subchannel(cdev->dev.parent); | |
956 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 957 | ccw_device_call_sch_unregister); |
1da177e4 LT |
958 | queue_work(slow_path_wq, &cdev->private->kick_work); |
959 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
960 | wake_up(&ccw_device_init_wq); | |
961 | break; | |
962 | case DEV_STATE_BOXED: | |
963 | /* Device did not respond in time. */ | |
964 | case DEV_STATE_OFFLINE: | |
965 | /* | |
966 | * We can't register the device in interrupt context so | |
967 | * we schedule a work item. | |
968 | */ | |
969 | if (!get_device(&cdev->dev)) | |
970 | break; | |
971 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 972 | io_subchannel_register); |
1da177e4 LT |
973 | queue_work(slow_path_wq, &cdev->private->kick_work); |
974 | break; | |
975 | } | |
976 | } | |
977 | ||
978 | static int | |
979 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
980 | { | |
981 | int rc; | |
982 | struct ccw_device_private *priv; | |
983 | ||
984 | sch->dev.driver_data = cdev; | |
985 | sch->driver = &io_subchannel_driver; | |
2ec22984 | 986 | cdev->ccwlock = sch->lock; |
fb6958a5 | 987 | |
1da177e4 LT |
988 | /* Init private data. */ |
989 | priv = cdev->private; | |
78964268 CH |
990 | priv->dev_id.devno = sch->schib.pmcw.dev; |
991 | priv->dev_id.ssid = sch->schid.ssid; | |
992 | priv->schid = sch->schid; | |
1da177e4 LT |
993 | priv->state = DEV_STATE_NOT_OPER; |
994 | INIT_LIST_HEAD(&priv->cmb_list); | |
995 | init_waitqueue_head(&priv->wait_q); | |
996 | init_timer(&priv->timer); | |
997 | ||
998 | /* Set an initial name for the device. */ | |
fb6958a5 CH |
999 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", |
1000 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 LT |
1001 | |
1002 | /* Increase counter of devices currently in recognition. */ | |
1003 | atomic_inc(&ccw_device_init_count); | |
1004 | ||
1005 | /* Start async. device sensing. */ | |
2ec22984 | 1006 | spin_lock_irq(sch->lock); |
1da177e4 | 1007 | rc = ccw_device_recognition(cdev); |
2ec22984 | 1008 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
1009 | if (rc) { |
1010 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1011 | wake_up(&ccw_device_init_wq); | |
1012 | } | |
1013 | return rc; | |
1014 | } | |
1015 | ||
d7b5a4c9 CH |
1016 | static void ccw_device_move_to_sch(struct work_struct *work) |
1017 | { | |
1018 | struct ccw_device_private *priv; | |
1019 | int rc; | |
1020 | struct subchannel *sch; | |
1021 | struct ccw_device *cdev; | |
1022 | struct subchannel *former_parent; | |
1023 | ||
1024 | priv = container_of(work, struct ccw_device_private, kick_work); | |
1025 | sch = priv->sch; | |
1026 | cdev = priv->cdev; | |
1027 | former_parent = ccw_device_is_orphan(cdev) ? | |
1028 | NULL : to_subchannel(get_device(cdev->dev.parent)); | |
1029 | mutex_lock(&sch->reg_mutex); | |
1030 | /* Try to move the ccw device to its new subchannel. */ | |
1031 | rc = device_move(&cdev->dev, &sch->dev); | |
1032 | mutex_unlock(&sch->reg_mutex); | |
1033 | if (rc) { | |
1034 | CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel " | |
1035 | "0.%x.%04x failed (ret=%d)!\n", | |
1036 | cdev->private->dev_id.ssid, | |
1037 | cdev->private->dev_id.devno, sch->schid.ssid, | |
1038 | sch->schid.sch_no, rc); | |
1039 | css_sch_device_unregister(sch); | |
1040 | goto out; | |
1041 | } | |
1042 | if (former_parent) { | |
1043 | spin_lock_irq(former_parent->lock); | |
1044 | former_parent->dev.driver_data = NULL; | |
1045 | spin_unlock_irq(former_parent->lock); | |
1046 | css_sch_device_unregister(former_parent); | |
1047 | /* Reset intparm to zeroes. */ | |
1048 | former_parent->schib.pmcw.intparm = 0; | |
1049 | cio_modify(former_parent); | |
1050 | } | |
1051 | sch_attach_device(sch, cdev); | |
1052 | out: | |
1053 | if (former_parent) | |
1054 | put_device(&former_parent->dev); | |
1055 | put_device(&cdev->dev); | |
1056 | } | |
1057 | ||
1da177e4 | 1058 | static int |
8bbace7e | 1059 | io_subchannel_probe (struct subchannel *sch) |
1da177e4 | 1060 | { |
1da177e4 LT |
1061 | struct ccw_device *cdev; |
1062 | int rc; | |
1063 | unsigned long flags; | |
d7b5a4c9 | 1064 | struct ccw_dev_id dev_id; |
1da177e4 | 1065 | |
1da177e4 LT |
1066 | if (sch->dev.driver_data) { |
1067 | /* | |
1068 | * This subchannel already has an associated ccw_device. | |
1069 | * Register it and exit. This happens for all early | |
1070 | * device, e.g. the console. | |
1071 | */ | |
1072 | cdev = sch->dev.driver_data; | |
1073 | device_initialize(&cdev->dev); | |
1074 | ccw_device_register(cdev); | |
1da177e4 LT |
1075 | /* |
1076 | * Check if the device is already online. If it is | |
1077 | * the reference count needs to be corrected | |
1078 | * (see ccw_device_online and css_init_done for the | |
1079 | * ugly details). | |
1080 | */ | |
1081 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1082 | cdev->private->state != DEV_STATE_OFFLINE && | |
1083 | cdev->private->state != DEV_STATE_BOXED) | |
1084 | get_device(&cdev->dev); | |
1085 | return 0; | |
1086 | } | |
d7b5a4c9 CH |
1087 | /* |
1088 | * First check if a fitting device may be found amongst the | |
1089 | * disconnected devices or in the orphanage. | |
1090 | */ | |
1091 | dev_id.devno = sch->schib.pmcw.dev; | |
1092 | dev_id.ssid = sch->schid.ssid; | |
1093 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); | |
1094 | if (!cdev) | |
1095 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1096 | &dev_id); | |
1097 | if (cdev) { | |
1098 | /* | |
1099 | * Schedule moving the device until when we have a registered | |
1100 | * subchannel to move to and succeed the probe. We can | |
1101 | * unregister later again, when the probe is through. | |
1102 | */ | |
1103 | cdev->private->sch = sch; | |
1104 | PREPARE_WORK(&cdev->private->kick_work, | |
1105 | ccw_device_move_to_sch); | |
1106 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1107 | return 0; | |
1108 | } | |
7674da77 CH |
1109 | cdev = io_subchannel_create_ccwdev(sch); |
1110 | if (IS_ERR(cdev)) | |
1111 | return PTR_ERR(cdev); | |
1da177e4 | 1112 | |
8bbace7e | 1113 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1114 | if (rc) { |
2ec22984 | 1115 | spin_lock_irqsave(sch->lock, flags); |
1da177e4 | 1116 | sch->dev.driver_data = NULL; |
2ec22984 | 1117 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
1118 | if (cdev->dev.release) |
1119 | cdev->dev.release(&cdev->dev); | |
1120 | } | |
1121 | ||
1122 | return rc; | |
1123 | } | |
1124 | ||
1da177e4 | 1125 | static int |
8bbace7e | 1126 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1127 | { |
1128 | struct ccw_device *cdev; | |
1129 | unsigned long flags; | |
1130 | ||
8bbace7e | 1131 | if (!sch->dev.driver_data) |
1da177e4 | 1132 | return 0; |
8bbace7e | 1133 | cdev = sch->dev.driver_data; |
1da177e4 LT |
1134 | /* Set ccw device to not operational and drop reference. */ |
1135 | spin_lock_irqsave(cdev->ccwlock, flags); | |
8bbace7e | 1136 | sch->dev.driver_data = NULL; |
1da177e4 LT |
1137 | cdev->private->state = DEV_STATE_NOT_OPER; |
1138 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1139 | /* | |
1140 | * Put unregistration on workqueue to avoid livelocks on the css bus | |
1141 | * semaphore. | |
1142 | */ | |
1143 | if (get_device(&cdev->dev)) { | |
1144 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1145 | ccw_device_unregister); |
1da177e4 LT |
1146 | queue_work(ccw_device_work, &cdev->private->kick_work); |
1147 | } | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | static int | |
1152 | io_subchannel_notify(struct device *dev, int event) | |
1153 | { | |
1154 | struct ccw_device *cdev; | |
1155 | ||
1156 | cdev = dev->driver_data; | |
1157 | if (!cdev) | |
1158 | return 0; | |
1159 | if (!cdev->drv) | |
1160 | return 0; | |
1161 | if (!cdev->online) | |
1162 | return 0; | |
1163 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; | |
1164 | } | |
1165 | ||
1166 | static void | |
1167 | io_subchannel_verify(struct device *dev) | |
1168 | { | |
1169 | struct ccw_device *cdev; | |
1170 | ||
1171 | cdev = dev->driver_data; | |
1172 | if (cdev) | |
1173 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1174 | } | |
1175 | ||
1176 | static void | |
1177 | io_subchannel_ioterm(struct device *dev) | |
1178 | { | |
1179 | struct ccw_device *cdev; | |
1180 | ||
1181 | cdev = dev->driver_data; | |
1182 | if (!cdev) | |
1183 | return; | |
d23861ff CH |
1184 | /* Internal I/O will be retried by the interrupt handler. */ |
1185 | if (cdev->private->flags.intretry) | |
1186 | return; | |
1da177e4 LT |
1187 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
1188 | if (cdev->handler) | |
1189 | cdev->handler(cdev, cdev->private->intparm, | |
1190 | ERR_PTR(-EIO)); | |
1191 | } | |
1192 | ||
1193 | static void | |
8bbace7e | 1194 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1195 | { |
1da177e4 LT |
1196 | struct ccw_device *cdev; |
1197 | int ret; | |
1198 | ||
8bbace7e | 1199 | cdev = sch->dev.driver_data; |
1da177e4 | 1200 | |
a8237fc4 | 1201 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1202 | return; |
1203 | if (!sch->schib.pmcw.ena) | |
1204 | /* Nothing to do. */ | |
1205 | return; | |
1206 | ret = cio_disable_subchannel(sch); | |
1207 | if (ret != -EBUSY) | |
1208 | /* Subchannel is disabled, we're done. */ | |
1209 | return; | |
1210 | cdev->private->state = DEV_STATE_QUIESCE; | |
1211 | if (cdev->handler) | |
1212 | cdev->handler(cdev, cdev->private->intparm, | |
1213 | ERR_PTR(-EIO)); | |
1214 | ret = ccw_device_cancel_halt_clear(cdev); | |
1215 | if (ret == -EBUSY) { | |
1216 | ccw_device_set_timeout(cdev, HZ/10); | |
1217 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1218 | } | |
1219 | cio_disable_subchannel(sch); | |
1220 | } | |
1221 | ||
1222 | #ifdef CONFIG_CCW_CONSOLE | |
1223 | static struct ccw_device console_cdev; | |
1224 | static struct ccw_device_private console_private; | |
1225 | static int console_cdev_in_use; | |
1226 | ||
2ec22984 CH |
1227 | static DEFINE_SPINLOCK(ccw_console_lock); |
1228 | ||
1229 | spinlock_t * cio_get_console_lock(void) | |
1230 | { | |
1231 | return &ccw_console_lock; | |
1232 | } | |
1233 | ||
1da177e4 LT |
1234 | static int |
1235 | ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch) | |
1236 | { | |
1237 | int rc; | |
1238 | ||
1239 | /* Initialize the ccw_device structure. */ | |
292888c8 | 1240 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1241 | rc = io_subchannel_recog(cdev, sch); |
1242 | if (rc) | |
1243 | return rc; | |
1244 | ||
1245 | /* Now wait for the async. recognition to come to an end. */ | |
1246 | spin_lock_irq(cdev->ccwlock); | |
1247 | while (!dev_fsm_final_state(cdev)) | |
1248 | wait_cons_dev(); | |
1249 | rc = -EIO; | |
1250 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1251 | goto out_unlock; | |
1252 | ccw_device_online(cdev); | |
1253 | while (!dev_fsm_final_state(cdev)) | |
1254 | wait_cons_dev(); | |
1255 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1256 | goto out_unlock; | |
1257 | rc = 0; | |
1258 | out_unlock: | |
1259 | spin_unlock_irq(cdev->ccwlock); | |
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | struct ccw_device * | |
1264 | ccw_device_probe_console(void) | |
1265 | { | |
1266 | struct subchannel *sch; | |
1267 | int ret; | |
1268 | ||
1269 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1270 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1271 | sch = cio_probe_console(); |
1272 | if (IS_ERR(sch)) { | |
1273 | console_cdev_in_use = 0; | |
1274 | return (void *) sch; | |
1275 | } | |
1276 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1277 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1278 | console_cdev.private = &console_private; | |
c1637532 | 1279 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1280 | ret = ccw_device_console_enable(&console_cdev, sch); |
1281 | if (ret) { | |
1282 | cio_release_console(); | |
1283 | console_cdev_in_use = 0; | |
1284 | return ERR_PTR(ret); | |
1285 | } | |
1286 | console_cdev.online = 1; | |
1287 | return &console_cdev; | |
1288 | } | |
1289 | #endif | |
1290 | ||
1291 | /* | |
1292 | * get ccw_device matching the busid, but only if owned by cdrv | |
1293 | */ | |
b0744bd2 CH |
1294 | static int |
1295 | __ccwdev_check_busid(struct device *dev, void *id) | |
1296 | { | |
1297 | char *bus_id; | |
1298 | ||
12975aef | 1299 | bus_id = id; |
b0744bd2 CH |
1300 | |
1301 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); | |
1302 | } | |
1303 | ||
1304 | ||
1da177e4 LT |
1305 | struct ccw_device * |
1306 | get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id) | |
1307 | { | |
b0744bd2 | 1308 | struct device *dev; |
1da177e4 LT |
1309 | struct device_driver *drv; |
1310 | ||
1311 | drv = get_driver(&cdrv->driver); | |
1312 | if (!drv) | |
b0744bd2 | 1313 | return NULL; |
1da177e4 | 1314 | |
b0744bd2 CH |
1315 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1316 | __ccwdev_check_busid); | |
1da177e4 LT |
1317 | put_driver(drv); |
1318 | ||
d2c993d8 | 1319 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1320 | } |
1321 | ||
1322 | /************************** device driver handling ************************/ | |
1323 | ||
1324 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1325 | * and release methods are initially very similar to the device_driver | |
1326 | * implementations, with the difference that they have ccw_device | |
1327 | * arguments. | |
1328 | * | |
1329 | * A ccw driver also contains the information that is needed for | |
1330 | * device matching. | |
1331 | */ | |
1332 | static int | |
1333 | ccw_device_probe (struct device *dev) | |
1334 | { | |
1335 | struct ccw_device *cdev = to_ccwdev(dev); | |
1336 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1337 | int ret; | |
1338 | ||
1339 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1340 | ||
1341 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1342 | ||
1343 | if (ret) { | |
d2c993d8 | 1344 | cdev->drv = NULL; |
1da177e4 LT |
1345 | return ret; |
1346 | } | |
1347 | ||
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | static int | |
1352 | ccw_device_remove (struct device *dev) | |
1353 | { | |
1354 | struct ccw_device *cdev = to_ccwdev(dev); | |
1355 | struct ccw_driver *cdrv = cdev->drv; | |
1356 | int ret; | |
1357 | ||
1358 | pr_debug("removing device %s\n", cdev->dev.bus_id); | |
1359 | if (cdrv->remove) | |
1360 | cdrv->remove(cdev); | |
1361 | if (cdev->online) { | |
1362 | cdev->online = 0; | |
1363 | spin_lock_irq(cdev->ccwlock); | |
1364 | ret = ccw_device_offline(cdev); | |
1365 | spin_unlock_irq(cdev->ccwlock); | |
1366 | if (ret == 0) | |
1367 | wait_event(cdev->private->wait_q, | |
1368 | dev_fsm_final_state(cdev)); | |
1369 | else | |
1370 | //FIXME: we can't fail! | |
1371 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
1372 | ret, cdev->dev.bus_id); | |
1373 | } | |
1374 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1375 | cdev->drv = NULL; |
1da177e4 LT |
1376 | return 0; |
1377 | } | |
1378 | ||
8bbace7e CH |
1379 | struct bus_type ccw_bus_type = { |
1380 | .name = "ccw", | |
1381 | .match = ccw_bus_match, | |
1382 | .uevent = ccw_uevent, | |
1383 | .probe = ccw_device_probe, | |
1384 | .remove = ccw_device_remove, | |
1385 | }; | |
1386 | ||
1da177e4 LT |
1387 | int |
1388 | ccw_driver_register (struct ccw_driver *cdriver) | |
1389 | { | |
1390 | struct device_driver *drv = &cdriver->driver; | |
1391 | ||
1392 | drv->bus = &ccw_bus_type; | |
1393 | drv->name = cdriver->name; | |
1da177e4 LT |
1394 | |
1395 | return driver_register(drv); | |
1396 | } | |
1397 | ||
1398 | void | |
1399 | ccw_driver_unregister (struct ccw_driver *cdriver) | |
1400 | { | |
1401 | driver_unregister(&cdriver->driver); | |
1402 | } | |
1403 | ||
a8237fc4 CH |
1404 | /* Helper func for qdio. */ |
1405 | struct subchannel_id | |
1406 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1407 | { | |
1408 | struct subchannel *sch; | |
1409 | ||
1410 | sch = to_subchannel(cdev->dev.parent); | |
1411 | return sch->schid; | |
1412 | } | |
1413 | ||
1da177e4 LT |
1414 | MODULE_LICENSE("GPL"); |
1415 | EXPORT_SYMBOL(ccw_device_set_online); | |
1416 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1417 | EXPORT_SYMBOL(ccw_driver_register); | |
1418 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1419 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1420 | EXPORT_SYMBOL(ccw_bus_type); | |
1421 | EXPORT_SYMBOL(ccw_device_work); | |
1422 | EXPORT_SYMBOL(ccw_device_notify_work); | |
a8237fc4 | 1423 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |