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> | |
90ab1336 | 20 | #include <linux/timer.h> |
1da177e4 LT |
21 | |
22 | #include <asm/ccwdev.h> | |
23 | #include <asm/cio.h> | |
4e57b681 | 24 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 25 | #include <asm/cmb.h> |
1da177e4 LT |
26 | |
27 | #include "cio.h" | |
d7b5a4c9 | 28 | #include "cio_debug.h" |
1da177e4 LT |
29 | #include "css.h" |
30 | #include "device.h" | |
31 | #include "ioasm.h" | |
cd6b4f27 | 32 | #include "io_sch.h" |
1da177e4 | 33 | |
90ab1336 | 34 | static struct timer_list recovery_timer; |
486d0a00 | 35 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
36 | static int recovery_phase; |
37 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
38 | ||
1da177e4 LT |
39 | /******************* bus type handling ***********************/ |
40 | ||
41 | /* The Linux driver model distinguishes between a bus type and | |
42 | * the bus itself. Of course we only have one channel | |
43 | * subsystem driver and one channel system per machine, but | |
44 | * we still use the abstraction. T.R. says it's a good idea. */ | |
45 | static int | |
46 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
47 | { | |
48 | struct ccw_device *cdev = to_ccwdev(dev); | |
49 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
50 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
51 | ||
52 | if (!ids) | |
53 | return 0; | |
54 | ||
55 | found = ccw_device_id_match(ids, &cdev->id); | |
56 | if (!found) | |
57 | return 0; | |
58 | ||
59 | cdev->id.driver_info = found->driver_info; | |
60 | ||
61 | return 1; | |
62 | } | |
63 | ||
db0c2d59 PO |
64 | /* Store modalias string delimited by prefix/suffix string into buffer with |
65 | * specified size. Return length of resulting string (excluding trailing '\0') | |
66 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 67 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 68 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 69 | { |
db0c2d59 | 70 | int len; |
1da177e4 | 71 | |
cfbe9bb2 | 72 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
73 | if (len > size) |
74 | return len; | |
75 | buf += len; | |
76 | size -= len; | |
1da177e4 | 77 | |
db0c2d59 PO |
78 | if (id->dev_type != 0) |
79 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
80 | id->dev_model, suffix); | |
81 | else | |
82 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 83 | |
db0c2d59 PO |
84 | return len; |
85 | } | |
86 | ||
87 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
88 | * non-zero otherwise. */ | |
7eff2e7a | 89 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
90 | { |
91 | struct ccw_device *cdev = to_ccwdev(dev); | |
92 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
93 | int ret; |
94 | char modalias_buf[30]; | |
1da177e4 | 95 | |
db0c2d59 | 96 | /* CU_TYPE= */ |
7eff2e7a | 97 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
98 | if (ret) |
99 | return ret; | |
db0c2d59 PO |
100 | |
101 | /* CU_MODEL= */ | |
7eff2e7a | 102 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
103 | if (ret) |
104 | return ret; | |
1da177e4 LT |
105 | |
106 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 107 | /* DEV_TYPE= */ |
7eff2e7a | 108 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
109 | if (ret) |
110 | return ret; | |
1da177e4 | 111 | |
db0c2d59 | 112 | /* DEV_MODEL= */ |
7eff2e7a | 113 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
114 | if (ret) |
115 | return ret; | |
db0c2d59 PO |
116 | |
117 | /* MODALIAS= */ | |
cfbe9bb2 | 118 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
119 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
120 | return ret; | |
1da177e4 LT |
121 | } |
122 | ||
8bbace7e | 123 | struct bus_type ccw_bus_type; |
1da177e4 | 124 | |
602b20f2 CH |
125 | static void io_subchannel_irq(struct subchannel *); |
126 | static int io_subchannel_probe(struct subchannel *); | |
127 | static int io_subchannel_remove(struct subchannel *); | |
128 | static int io_subchannel_notify(struct subchannel *, int); | |
129 | static void io_subchannel_verify(struct subchannel *); | |
130 | static void io_subchannel_ioterm(struct subchannel *); | |
8bbace7e | 131 | static void io_subchannel_shutdown(struct subchannel *); |
1da177e4 | 132 | |
f7e5d67c | 133 | static struct css_driver io_subchannel_driver = { |
4beee646 | 134 | .owner = THIS_MODULE, |
1da177e4 | 135 | .subchannel_type = SUBCHANNEL_TYPE_IO, |
25b7bb58 | 136 | .name = "io_subchannel", |
1da177e4 LT |
137 | .irq = io_subchannel_irq, |
138 | .notify = io_subchannel_notify, | |
139 | .verify = io_subchannel_verify, | |
140 | .termination = io_subchannel_ioterm, | |
8bbace7e CH |
141 | .probe = io_subchannel_probe, |
142 | .remove = io_subchannel_remove, | |
143 | .shutdown = io_subchannel_shutdown, | |
1da177e4 LT |
144 | }; |
145 | ||
146 | struct workqueue_struct *ccw_device_work; | |
147 | struct workqueue_struct *ccw_device_notify_work; | |
40154b82 PO |
148 | wait_queue_head_t ccw_device_init_wq; |
149 | atomic_t ccw_device_init_count; | |
1da177e4 | 150 | |
90ab1336 PO |
151 | static void recovery_func(unsigned long data); |
152 | ||
1da177e4 LT |
153 | static int __init |
154 | init_ccw_bus_type (void) | |
155 | { | |
156 | int ret; | |
157 | ||
158 | init_waitqueue_head(&ccw_device_init_wq); | |
159 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 160 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 LT |
161 | |
162 | ccw_device_work = create_singlethread_workqueue("cio"); | |
163 | if (!ccw_device_work) | |
164 | return -ENOMEM; /* FIXME: better errno ? */ | |
165 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); | |
166 | if (!ccw_device_notify_work) { | |
167 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
168 | goto out_err; | |
169 | } | |
170 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); | |
171 | if (!slow_path_wq) { | |
172 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
173 | goto out_err; | |
174 | } | |
175 | if ((ret = bus_register (&ccw_bus_type))) | |
176 | goto out_err; | |
177 | ||
25b7bb58 CH |
178 | ret = css_driver_register(&io_subchannel_driver); |
179 | if (ret) | |
1da177e4 LT |
180 | goto out_err; |
181 | ||
182 | wait_event(ccw_device_init_wq, | |
183 | atomic_read(&ccw_device_init_count) == 0); | |
184 | flush_workqueue(ccw_device_work); | |
185 | return 0; | |
186 | out_err: | |
187 | if (ccw_device_work) | |
188 | destroy_workqueue(ccw_device_work); | |
189 | if (ccw_device_notify_work) | |
190 | destroy_workqueue(ccw_device_notify_work); | |
191 | if (slow_path_wq) | |
192 | destroy_workqueue(slow_path_wq); | |
193 | return ret; | |
194 | } | |
195 | ||
196 | static void __exit | |
197 | cleanup_ccw_bus_type (void) | |
198 | { | |
25b7bb58 | 199 | css_driver_unregister(&io_subchannel_driver); |
1da177e4 LT |
200 | bus_unregister(&ccw_bus_type); |
201 | destroy_workqueue(ccw_device_notify_work); | |
202 | destroy_workqueue(ccw_device_work); | |
203 | } | |
204 | ||
205 | subsys_initcall(init_ccw_bus_type); | |
206 | module_exit(cleanup_ccw_bus_type); | |
207 | ||
208 | /************************ device handling **************************/ | |
209 | ||
210 | /* | |
211 | * A ccw_device has some interfaces in sysfs in addition to the | |
212 | * standard ones. | |
213 | * The following entries are designed to export the information which | |
214 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
215 | * are obvious, so they don't have an entry :) | |
216 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
217 | */ | |
218 | static ssize_t | |
3fd3c0a5 | 219 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
220 | { |
221 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 222 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
223 | ssize_t ret = 0; |
224 | int chp; | |
7ad6a249 PO |
225 | int mask; |
226 | ||
227 | for (chp = 0; chp < 8; chp++) { | |
228 | mask = 0x80 >> chp; | |
229 | if (ssd->path_mask & mask) | |
230 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
231 | else | |
232 | ret += sprintf(buf + ret, "00 "); | |
233 | } | |
1da177e4 LT |
234 | ret += sprintf (buf+ret, "\n"); |
235 | return min((ssize_t)PAGE_SIZE, ret); | |
236 | } | |
237 | ||
238 | static ssize_t | |
3fd3c0a5 | 239 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
240 | { |
241 | struct subchannel *sch = to_subchannel(dev); | |
242 | struct pmcw *pmcw = &sch->schib.pmcw; | |
243 | ||
244 | return sprintf (buf, "%02x %02x %02x\n", | |
245 | pmcw->pim, pmcw->pam, pmcw->pom); | |
246 | } | |
247 | ||
248 | static ssize_t | |
3fd3c0a5 | 249 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
250 | { |
251 | struct ccw_device *cdev = to_ccwdev(dev); | |
252 | struct ccw_device_id *id = &(cdev->id); | |
253 | ||
254 | if (id->dev_type != 0) | |
255 | return sprintf(buf, "%04x/%02x\n", | |
256 | id->dev_type, id->dev_model); | |
257 | else | |
258 | return sprintf(buf, "n/a\n"); | |
259 | } | |
260 | ||
261 | static ssize_t | |
3fd3c0a5 | 262 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
263 | { |
264 | struct ccw_device *cdev = to_ccwdev(dev); | |
265 | struct ccw_device_id *id = &(cdev->id); | |
266 | ||
267 | return sprintf(buf, "%04x/%02x\n", | |
268 | id->cu_type, id->cu_model); | |
269 | } | |
270 | ||
f1fc78a8 BB |
271 | static ssize_t |
272 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
273 | { | |
274 | struct ccw_device *cdev = to_ccwdev(dev); | |
275 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 276 | int len; |
f1fc78a8 | 277 | |
086a6c62 | 278 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
279 | |
280 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
281 | } |
282 | ||
1da177e4 | 283 | static ssize_t |
3fd3c0a5 | 284 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
285 | { |
286 | struct ccw_device *cdev = to_ccwdev(dev); | |
287 | ||
288 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
289 | } | |
290 | ||
d7b5a4c9 CH |
291 | int ccw_device_is_orphan(struct ccw_device *cdev) |
292 | { | |
293 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
294 | } | |
295 | ||
ef99516c | 296 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 297 | { |
7674da77 | 298 | if (test_and_clear_bit(1, &cdev->private->registered)) |
ef99516c | 299 | device_del(&cdev->dev); |
7674da77 CH |
300 | } |
301 | ||
59a8a6e2 CH |
302 | static void ccw_device_remove_orphan_cb(struct device *dev) |
303 | { | |
304 | struct ccw_device *cdev = to_ccwdev(dev); | |
305 | ||
306 | ccw_device_unregister(cdev); | |
307 | put_device(&cdev->dev); | |
308 | } | |
309 | ||
310 | static void ccw_device_remove_sch_cb(struct device *dev) | |
311 | { | |
312 | struct subchannel *sch; | |
313 | ||
314 | sch = to_subchannel(dev); | |
315 | css_sch_device_unregister(sch); | |
316 | /* Reset intparm to zeroes. */ | |
317 | sch->schib.pmcw.intparm = 0; | |
318 | cio_modify(sch); | |
319 | put_device(&sch->dev); | |
320 | } | |
321 | ||
1da177e4 LT |
322 | static void |
323 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
324 | { | |
d7b5a4c9 | 325 | unsigned long flags; |
59a8a6e2 CH |
326 | int rc; |
327 | ||
1da177e4 LT |
328 | /* |
329 | * Forced offline in disconnected state means | |
330 | * 'throw away device'. | |
331 | */ | |
d7b5a4c9 | 332 | if (ccw_device_is_orphan(cdev)) { |
59a8a6e2 CH |
333 | /* |
334 | * Deregister ccw device. | |
335 | * Unfortunately, we cannot do this directly from the | |
336 | * attribute method. | |
337 | */ | |
d7b5a4c9 CH |
338 | spin_lock_irqsave(cdev->ccwlock, flags); |
339 | cdev->private->state = DEV_STATE_NOT_OPER; | |
340 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
59a8a6e2 CH |
341 | rc = device_schedule_callback(&cdev->dev, |
342 | ccw_device_remove_orphan_cb); | |
343 | if (rc) | |
e556bbbd CH |
344 | CIO_MSG_EVENT(2, "Couldn't unregister orphan " |
345 | "0.%x.%04x\n", | |
346 | cdev->private->dev_id.ssid, | |
347 | cdev->private->dev_id.devno); | |
59a8a6e2 | 348 | return; |
d7b5a4c9 | 349 | } |
59a8a6e2 CH |
350 | /* Deregister subchannel, which will kill the ccw device. */ |
351 | rc = device_schedule_callback(cdev->dev.parent, | |
352 | ccw_device_remove_sch_cb); | |
353 | if (rc) | |
e556bbbd CH |
354 | CIO_MSG_EVENT(2, "Couldn't unregister disconnected device " |
355 | "0.%x.%04x\n", | |
356 | cdev->private->dev_id.ssid, | |
357 | cdev->private->dev_id.devno); | |
1da177e4 LT |
358 | } |
359 | ||
b2ffd8e9 CH |
360 | /** |
361 | * ccw_device_set_offline() - disable a ccw device for I/O | |
362 | * @cdev: target ccw device | |
363 | * | |
364 | * This function calls the driver's set_offline() function for @cdev, if | |
365 | * given, and then disables @cdev. | |
366 | * Returns: | |
367 | * %0 on success and a negative error value on failure. | |
368 | * Context: | |
369 | * enabled, ccw device lock not held | |
370 | */ | |
371 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 LT |
372 | { |
373 | int ret; | |
374 | ||
375 | if (!cdev) | |
376 | return -ENODEV; | |
377 | if (!cdev->online || !cdev->drv) | |
378 | return -EINVAL; | |
379 | ||
380 | if (cdev->drv->set_offline) { | |
381 | ret = cdev->drv->set_offline(cdev); | |
382 | if (ret != 0) | |
383 | return ret; | |
384 | } | |
385 | cdev->online = 0; | |
386 | spin_lock_irq(cdev->ccwlock); | |
387 | ret = ccw_device_offline(cdev); | |
388 | if (ret == -ENODEV) { | |
389 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
390 | cdev->private->state = DEV_STATE_OFFLINE; | |
391 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
392 | } | |
393 | spin_unlock_irq(cdev->ccwlock); | |
394 | return ret; | |
395 | } | |
396 | spin_unlock_irq(cdev->ccwlock); | |
397 | if (ret == 0) | |
398 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
399 | else { | |
e556bbbd CH |
400 | CIO_MSG_EVENT(2, "ccw_device_offline returned %d, " |
401 | "device 0.%x.%04x\n", | |
402 | ret, cdev->private->dev_id.ssid, | |
403 | cdev->private->dev_id.devno); | |
1da177e4 LT |
404 | cdev->online = 1; |
405 | } | |
406 | return ret; | |
407 | } | |
408 | ||
b2ffd8e9 CH |
409 | /** |
410 | * ccw_device_set_online() - enable a ccw device for I/O | |
411 | * @cdev: target ccw device | |
412 | * | |
413 | * This function first enables @cdev and then calls the driver's set_online() | |
414 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
415 | * disabled again. | |
416 | * Returns: | |
417 | * %0 on success and a negative error value on failure. | |
418 | * Context: | |
419 | * enabled, ccw device lock not held | |
420 | */ | |
421 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
422 | { |
423 | int ret; | |
424 | ||
425 | if (!cdev) | |
426 | return -ENODEV; | |
427 | if (cdev->online || !cdev->drv) | |
428 | return -EINVAL; | |
429 | ||
430 | spin_lock_irq(cdev->ccwlock); | |
431 | ret = ccw_device_online(cdev); | |
432 | spin_unlock_irq(cdev->ccwlock); | |
433 | if (ret == 0) | |
434 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
435 | else { | |
e556bbbd CH |
436 | CIO_MSG_EVENT(2, "ccw_device_online returned %d, " |
437 | "device 0.%x.%04x\n", | |
438 | ret, cdev->private->dev_id.ssid, | |
439 | cdev->private->dev_id.devno); | |
1da177e4 LT |
440 | return ret; |
441 | } | |
442 | if (cdev->private->state != DEV_STATE_ONLINE) | |
443 | return -ENODEV; | |
444 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { | |
445 | cdev->online = 1; | |
446 | return 0; | |
447 | } | |
448 | spin_lock_irq(cdev->ccwlock); | |
449 | ret = ccw_device_offline(cdev); | |
450 | spin_unlock_irq(cdev->ccwlock); | |
451 | if (ret == 0) | |
452 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
e556bbbd CH |
453 | else |
454 | CIO_MSG_EVENT(2, "ccw_device_offline returned %d, " | |
455 | "device 0.%x.%04x\n", | |
456 | ret, cdev->private->dev_id.ssid, | |
457 | cdev->private->dev_id.devno); | |
6cadb78b | 458 | return (ret == 0) ? -ENODEV : ret; |
1da177e4 LT |
459 | } |
460 | ||
f5ba6c86 CH |
461 | static void online_store_handle_offline(struct ccw_device *cdev) |
462 | { | |
463 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
464 | ccw_device_remove_disconnected(cdev); | |
465 | else if (cdev->drv && cdev->drv->set_offline) | |
466 | ccw_device_set_offline(cdev); | |
467 | } | |
468 | ||
469 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
470 | { | |
471 | int ret; | |
472 | ||
473 | /* Do device recognition, if needed. */ | |
474 | if (cdev->id.cu_type == 0) { | |
475 | ret = ccw_device_recognition(cdev); | |
476 | if (ret) { | |
e556bbbd CH |
477 | CIO_MSG_EVENT(0, "Couldn't start recognition " |
478 | "for device 0.%x.%04x (ret=%d)\n", | |
479 | cdev->private->dev_id.ssid, | |
480 | cdev->private->dev_id.devno, ret); | |
f5ba6c86 CH |
481 | return ret; |
482 | } | |
483 | wait_event(cdev->private->wait_q, | |
484 | cdev->private->flags.recog_done); | |
485 | } | |
486 | if (cdev->drv && cdev->drv->set_online) | |
487 | ccw_device_set_online(cdev); | |
488 | return 0; | |
489 | } | |
490 | static void online_store_handle_online(struct ccw_device *cdev, int force) | |
491 | { | |
492 | int ret; | |
493 | ||
494 | ret = online_store_recog_and_online(cdev); | |
495 | if (ret) | |
496 | return; | |
497 | if (force && cdev->private->state == DEV_STATE_BOXED) { | |
498 | ret = ccw_device_stlck(cdev); | |
499 | if (ret) { | |
e556bbbd CH |
500 | dev_warn(&cdev->dev, |
501 | "ccw_device_stlck returned %d!\n", ret); | |
f5ba6c86 CH |
502 | return; |
503 | } | |
504 | if (cdev->id.cu_type == 0) | |
505 | cdev->private->state = DEV_STATE_NOT_OPER; | |
506 | online_store_recog_and_online(cdev); | |
507 | } | |
508 | ||
509 | } | |
510 | ||
511 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
512 | const char *buf, size_t count) | |
1da177e4 LT |
513 | { |
514 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
515 | int force, ret; |
516 | unsigned long i; | |
1da177e4 | 517 | |
973bd993 | 518 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 LT |
519 | return -EAGAIN; |
520 | ||
521 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
522 | atomic_set(&cdev->private->onoff, 0); | |
523 | return -EINVAL; | |
524 | } | |
525 | if (!strncmp(buf, "force\n", count)) { | |
526 | force = 1; | |
527 | i = 1; | |
2f972202 | 528 | ret = 0; |
1da177e4 LT |
529 | } else { |
530 | force = 0; | |
2f972202 | 531 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 532 | } |
2f972202 CH |
533 | if (ret) |
534 | goto out; | |
f5ba6c86 CH |
535 | switch (i) { |
536 | case 0: | |
537 | online_store_handle_offline(cdev); | |
2f972202 | 538 | ret = count; |
f5ba6c86 CH |
539 | break; |
540 | case 1: | |
541 | online_store_handle_online(cdev, force); | |
2f972202 | 542 | ret = count; |
f5ba6c86 CH |
543 | break; |
544 | default: | |
2f972202 | 545 | ret = -EINVAL; |
1da177e4 | 546 | } |
2f972202 | 547 | out: |
1da177e4 LT |
548 | if (cdev->drv) |
549 | module_put(cdev->drv->owner); | |
550 | atomic_set(&cdev->private->onoff, 0); | |
2f972202 | 551 | return ret; |
1da177e4 LT |
552 | } |
553 | ||
554 | static ssize_t | |
3fd3c0a5 | 555 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
556 | { |
557 | struct ccw_device *cdev = to_ccwdev(dev); | |
558 | struct subchannel *sch; | |
559 | ||
d7b5a4c9 CH |
560 | if (ccw_device_is_orphan(cdev)) |
561 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
562 | switch (cdev->private->state) { |
563 | case DEV_STATE_BOXED: | |
564 | return sprintf(buf, "boxed\n"); | |
565 | case DEV_STATE_DISCONNECTED: | |
566 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
567 | case DEV_STATE_NOT_OPER: | |
568 | sch = to_subchannel(dev->parent); | |
569 | if (!sch->lpm) | |
570 | return sprintf(buf, "no path\n"); | |
571 | else | |
572 | return sprintf(buf, "no device\n"); | |
573 | default: | |
574 | /* All other states considered fine. */ | |
575 | return sprintf(buf, "good\n"); | |
576 | } | |
577 | } | |
578 | ||
579 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
580 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
581 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
582 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 583 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 584 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
585 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
586 | ||
587 | static struct attribute * subch_attrs[] = { | |
588 | &dev_attr_chpids.attr, | |
589 | &dev_attr_pimpampom.attr, | |
590 | NULL, | |
591 | }; | |
592 | ||
593 | static struct attribute_group subch_attr_group = { | |
594 | .attrs = subch_attrs, | |
595 | }; | |
596 | ||
529192f3 CH |
597 | struct attribute_group *subch_attr_groups[] = { |
598 | &subch_attr_group, | |
599 | NULL, | |
600 | }; | |
1da177e4 LT |
601 | |
602 | static struct attribute * ccwdev_attrs[] = { | |
603 | &dev_attr_devtype.attr, | |
604 | &dev_attr_cutype.attr, | |
f1fc78a8 | 605 | &dev_attr_modalias.attr, |
1da177e4 LT |
606 | &dev_attr_online.attr, |
607 | &dev_attr_cmb_enable.attr, | |
608 | &dev_attr_availability.attr, | |
609 | NULL, | |
610 | }; | |
611 | ||
612 | static struct attribute_group ccwdev_attr_group = { | |
613 | .attrs = ccwdev_attrs, | |
614 | }; | |
615 | ||
f7e5d67c | 616 | static struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
617 | &ccwdev_attr_group, |
618 | NULL, | |
619 | }; | |
1da177e4 LT |
620 | |
621 | /* this is a simple abstraction for device_register that sets the | |
622 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 623 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
624 | { |
625 | struct device *dev = &cdev->dev; | |
626 | int ret; | |
627 | ||
628 | dev->bus = &ccw_bus_type; | |
629 | ||
630 | if ((ret = device_add(dev))) | |
631 | return ret; | |
632 | ||
633 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
634 | return ret; |
635 | } | |
636 | ||
b0744bd2 | 637 | struct match_data { |
78964268 | 638 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
639 | struct ccw_device * sibling; |
640 | }; | |
641 | ||
642 | static int | |
643 | match_devno(struct device * dev, void * data) | |
644 | { | |
78964268 | 645 | struct match_data * d = data; |
b0744bd2 CH |
646 | struct ccw_device * cdev; |
647 | ||
648 | cdev = to_ccwdev(dev); | |
649 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 650 | !ccw_device_is_orphan(cdev) && |
78964268 | 651 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 652 | (cdev != d->sibling)) |
b0744bd2 | 653 | return 1; |
b0744bd2 CH |
654 | return 0; |
655 | } | |
656 | ||
78964268 CH |
657 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
658 | struct ccw_device *sibling) | |
1da177e4 | 659 | { |
1da177e4 | 660 | struct device *dev; |
292888c8 | 661 | struct match_data data; |
1da177e4 | 662 | |
78964268 | 663 | data.dev_id = *dev_id; |
292888c8 | 664 | data.sibling = sibling; |
e5945b4f | 665 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 666 | |
b0744bd2 | 667 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
668 | } |
669 | ||
d7b5a4c9 CH |
670 | static int match_orphan(struct device *dev, void *data) |
671 | { | |
672 | struct ccw_dev_id *dev_id; | |
673 | struct ccw_device *cdev; | |
674 | ||
675 | dev_id = data; | |
676 | cdev = to_ccwdev(dev); | |
677 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
678 | } | |
679 | ||
680 | static struct ccw_device * | |
681 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
682 | struct ccw_dev_id *dev_id) | |
683 | { | |
684 | struct device *dev; | |
685 | ||
686 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
687 | match_orphan); | |
688 | ||
689 | return dev ? to_ccwdev(dev) : NULL; | |
690 | } | |
691 | ||
1da177e4 | 692 | static void |
c1637532 | 693 | ccw_device_add_changed(struct work_struct *work) |
1da177e4 | 694 | { |
c1637532 | 695 | struct ccw_device_private *priv; |
1da177e4 LT |
696 | struct ccw_device *cdev; |
697 | ||
c1637532 MS |
698 | priv = container_of(work, struct ccw_device_private, kick_work); |
699 | cdev = priv->cdev; | |
1da177e4 LT |
700 | if (device_add(&cdev->dev)) { |
701 | put_device(&cdev->dev); | |
702 | return; | |
703 | } | |
704 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
705 | } |
706 | ||
d7b5a4c9 | 707 | void ccw_device_do_unreg_rereg(struct work_struct *work) |
1da177e4 | 708 | { |
c1637532 | 709 | struct ccw_device_private *priv; |
1da177e4 LT |
710 | struct ccw_device *cdev; |
711 | struct subchannel *sch; | |
1da177e4 | 712 | |
c1637532 MS |
713 | priv = container_of(work, struct ccw_device_private, kick_work); |
714 | cdev = priv->cdev; | |
1da177e4 | 715 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 716 | |
ef99516c | 717 | ccw_device_unregister(cdev); |
1da177e4 | 718 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 719 | ccw_device_add_changed); |
1da177e4 LT |
720 | queue_work(ccw_device_work, &cdev->private->kick_work); |
721 | } | |
722 | ||
723 | static void | |
724 | ccw_device_release(struct device *dev) | |
725 | { | |
726 | struct ccw_device *cdev; | |
727 | ||
728 | cdev = to_ccwdev(dev); | |
729 | kfree(cdev->private); | |
730 | kfree(cdev); | |
731 | } | |
732 | ||
7674da77 CH |
733 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
734 | { | |
735 | struct ccw_device *cdev; | |
736 | ||
737 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
738 | if (cdev) { | |
739 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
740 | GFP_KERNEL | GFP_DMA); | |
741 | if (cdev->private) | |
742 | return cdev; | |
743 | } | |
744 | kfree(cdev); | |
745 | return ERR_PTR(-ENOMEM); | |
746 | } | |
747 | ||
748 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
749 | struct ccw_device *cdev) | |
750 | { | |
751 | cdev->private->cdev = cdev; | |
752 | atomic_set(&cdev->private->onoff, 0); | |
753 | cdev->dev.parent = &sch->dev; | |
754 | cdev->dev.release = ccw_device_release; | |
33583c36 | 755 | INIT_WORK(&cdev->private->kick_work, NULL); |
ef99516c | 756 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
757 | /* Do first half of device_register. */ |
758 | device_initialize(&cdev->dev); | |
759 | if (!get_device(&sch->dev)) { | |
760 | if (cdev->dev.release) | |
761 | cdev->dev.release(&cdev->dev); | |
762 | return -ENODEV; | |
763 | } | |
764 | return 0; | |
765 | } | |
766 | ||
767 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
768 | { | |
769 | struct ccw_device *cdev; | |
770 | int ret; | |
771 | ||
772 | cdev = io_subchannel_allocate_dev(sch); | |
773 | if (!IS_ERR(cdev)) { | |
774 | ret = io_subchannel_initialize_dev(sch, cdev); | |
775 | if (ret) { | |
776 | kfree(cdev); | |
777 | cdev = ERR_PTR(ret); | |
778 | } | |
779 | } | |
780 | return cdev; | |
781 | } | |
782 | ||
d7b5a4c9 CH |
783 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
784 | ||
785 | static void sch_attach_device(struct subchannel *sch, | |
786 | struct ccw_device *cdev) | |
787 | { | |
82b7ac05 | 788 | css_update_ssd_info(sch); |
d7b5a4c9 | 789 | spin_lock_irq(sch->lock); |
db6a6423 | 790 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
791 | cdev->private->schid = sch->schid; |
792 | cdev->ccwlock = sch->lock; | |
793 | device_trigger_reprobe(sch); | |
794 | spin_unlock_irq(sch->lock); | |
795 | } | |
796 | ||
797 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
798 | struct ccw_device *cdev) | |
799 | { | |
800 | struct subchannel *other_sch; | |
801 | int ret; | |
802 | ||
803 | other_sch = to_subchannel(get_device(cdev->dev.parent)); | |
804 | ret = device_move(&cdev->dev, &sch->dev); | |
805 | if (ret) { | |
806 | CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed " | |
807 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
808 | cdev->private->dev_id.devno, ret); | |
809 | put_device(&other_sch->dev); | |
810 | return; | |
811 | } | |
db6a6423 | 812 | sch_set_cdev(other_sch, NULL); |
d7b5a4c9 CH |
813 | /* No need to keep a subchannel without ccw device around. */ |
814 | css_sch_device_unregister(other_sch); | |
815 | put_device(&other_sch->dev); | |
816 | sch_attach_device(sch, cdev); | |
817 | } | |
818 | ||
819 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
820 | struct ccw_device *cdev) | |
821 | { | |
822 | int ret; | |
823 | ||
824 | /* Try to move the ccw device to its new subchannel. */ | |
825 | ret = device_move(&cdev->dev, &sch->dev); | |
826 | if (ret) { | |
827 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
828 | "failed (ret=%d)!\n", | |
829 | cdev->private->dev_id.ssid, | |
830 | cdev->private->dev_id.devno, ret); | |
831 | return; | |
832 | } | |
833 | sch_attach_device(sch, cdev); | |
834 | } | |
835 | ||
836 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
837 | { | |
838 | struct ccw_device *cdev; | |
839 | ||
840 | /* Need to allocate a new ccw device. */ | |
841 | cdev = io_subchannel_create_ccwdev(sch); | |
842 | if (IS_ERR(cdev)) { | |
843 | /* OK, we did everything we could... */ | |
844 | css_sch_device_unregister(sch); | |
845 | return; | |
846 | } | |
847 | spin_lock_irq(sch->lock); | |
db6a6423 | 848 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
849 | spin_unlock_irq(sch->lock); |
850 | /* Start recognition for the new ccw device. */ | |
851 | if (io_subchannel_recog(cdev, sch)) { | |
852 | spin_lock_irq(sch->lock); | |
db6a6423 | 853 | sch_set_cdev(sch, NULL); |
d7b5a4c9 CH |
854 | spin_unlock_irq(sch->lock); |
855 | if (cdev->dev.release) | |
856 | cdev->dev.release(&cdev->dev); | |
857 | css_sch_device_unregister(sch); | |
858 | } | |
859 | } | |
860 | ||
861 | ||
862 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
863 | { | |
864 | struct ccw_device_private *priv; | |
865 | struct ccw_device *cdev; | |
866 | struct ccw_device *replacing_cdev; | |
867 | struct subchannel *sch; | |
868 | int ret; | |
869 | struct channel_subsystem *css; | |
870 | struct ccw_dev_id dev_id; | |
871 | ||
872 | priv = container_of(work, struct ccw_device_private, kick_work); | |
873 | cdev = priv->cdev; | |
874 | sch = to_subchannel(cdev->dev.parent); | |
875 | css = to_css(sch->dev.parent); | |
876 | dev_id.devno = sch->schib.pmcw.dev; | |
877 | dev_id.ssid = sch->schid.ssid; | |
878 | ||
879 | /* | |
880 | * Move the orphaned ccw device to the orphanage so the replacing | |
881 | * ccw device can take its place on the subchannel. | |
882 | */ | |
883 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev); | |
884 | if (ret) { | |
885 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
886 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
887 | cdev->private->dev_id.devno, ret); | |
888 | return; | |
889 | } | |
890 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
891 | /* | |
892 | * Search for the replacing ccw device | |
893 | * - among the disconnected devices | |
894 | * - in the orphanage | |
895 | */ | |
896 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
897 | if (replacing_cdev) { | |
898 | sch_attach_disconnected_device(sch, replacing_cdev); | |
899 | return; | |
900 | } | |
901 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
902 | if (replacing_cdev) { | |
903 | sch_attach_orphaned_device(sch, replacing_cdev); | |
904 | return; | |
905 | } | |
906 | sch_create_and_recog_new_device(sch); | |
907 | } | |
908 | ||
1da177e4 LT |
909 | /* |
910 | * Register recognized device. | |
911 | */ | |
912 | static void | |
c1637532 | 913 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 914 | { |
c1637532 | 915 | struct ccw_device_private *priv; |
1da177e4 LT |
916 | struct ccw_device *cdev; |
917 | struct subchannel *sch; | |
918 | int ret; | |
919 | unsigned long flags; | |
920 | ||
c1637532 MS |
921 | priv = container_of(work, struct ccw_device_private, kick_work); |
922 | cdev = priv->cdev; | |
1da177e4 | 923 | sch = to_subchannel(cdev->dev.parent); |
82b7ac05 | 924 | css_update_ssd_info(sch); |
47af5518 CH |
925 | /* |
926 | * io_subchannel_register() will also be called after device | |
927 | * recognition has been done for a boxed device (which will already | |
928 | * be registered). We need to reprobe since we may now have sense id | |
929 | * information. | |
930 | */ | |
b0744bd2 | 931 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
47af5518 CH |
932 | if (!cdev->drv) { |
933 | ret = device_reprobe(&cdev->dev); | |
934 | if (ret) | |
935 | /* We can't do much here. */ | |
e556bbbd CH |
936 | CIO_MSG_EVENT(2, "device_reprobe() returned" |
937 | " %d for 0.%x.%04x\n", ret, | |
938 | cdev->private->dev_id.ssid, | |
939 | cdev->private->dev_id.devno); | |
47af5518 | 940 | } |
1da177e4 LT |
941 | goto out; |
942 | } | |
fa1a8c23 CH |
943 | /* |
944 | * Now we know this subchannel will stay, we can throw | |
945 | * our delayed uevent. | |
946 | */ | |
947 | sch->dev.uevent_suppress = 0; | |
948 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
949 | /* make it known to the system */ |
950 | ret = ccw_device_register(cdev); | |
951 | if (ret) { | |
e556bbbd CH |
952 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
953 | cdev->private->dev_id.ssid, | |
954 | cdev->private->dev_id.devno, ret); | |
1da177e4 | 955 | put_device(&cdev->dev); |
2ec22984 | 956 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 957 | sch_set_cdev(sch, NULL); |
2ec22984 | 958 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
959 | kfree (cdev->private); |
960 | kfree (cdev); | |
961 | put_device(&sch->dev); | |
962 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
963 | wake_up(&ccw_device_init_wq); | |
964 | return; | |
965 | } | |
1da177e4 LT |
966 | put_device(&cdev->dev); |
967 | out: | |
968 | cdev->private->flags.recog_done = 1; | |
969 | put_device(&sch->dev); | |
970 | wake_up(&cdev->private->wait_q); | |
971 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
972 | wake_up(&ccw_device_init_wq); | |
973 | } | |
974 | ||
3f4cf6e7 | 975 | static void ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 976 | { |
c1637532 MS |
977 | struct ccw_device_private *priv; |
978 | struct ccw_device *cdev; | |
1da177e4 LT |
979 | struct subchannel *sch; |
980 | ||
c1637532 MS |
981 | priv = container_of(work, struct ccw_device_private, kick_work); |
982 | cdev = priv->cdev; | |
1da177e4 | 983 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 984 | css_sch_device_unregister(sch); |
1da177e4 LT |
985 | /* Reset intparm to zeroes. */ |
986 | sch->schib.pmcw.intparm = 0; | |
987 | cio_modify(sch); | |
988 | put_device(&cdev->dev); | |
989 | put_device(&sch->dev); | |
990 | } | |
991 | ||
992 | /* | |
993 | * subchannel recognition done. Called from the state machine. | |
994 | */ | |
995 | void | |
996 | io_subchannel_recog_done(struct ccw_device *cdev) | |
997 | { | |
998 | struct subchannel *sch; | |
999 | ||
1000 | if (css_init_done == 0) { | |
1001 | cdev->private->flags.recog_done = 1; | |
1002 | return; | |
1003 | } | |
1004 | switch (cdev->private->state) { | |
1005 | case DEV_STATE_NOT_OPER: | |
1006 | cdev->private->flags.recog_done = 1; | |
1007 | /* Remove device found not operational. */ | |
1008 | if (!get_device(&cdev->dev)) | |
1009 | break; | |
1010 | sch = to_subchannel(cdev->dev.parent); | |
1011 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1012 | ccw_device_call_sch_unregister); |
1da177e4 LT |
1013 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1014 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1015 | wake_up(&ccw_device_init_wq); | |
1016 | break; | |
1017 | case DEV_STATE_BOXED: | |
1018 | /* Device did not respond in time. */ | |
1019 | case DEV_STATE_OFFLINE: | |
1020 | /* | |
1021 | * We can't register the device in interrupt context so | |
1022 | * we schedule a work item. | |
1023 | */ | |
1024 | if (!get_device(&cdev->dev)) | |
1025 | break; | |
1026 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1027 | io_subchannel_register); |
1da177e4 LT |
1028 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1029 | break; | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | static int | |
1034 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
1035 | { | |
1036 | int rc; | |
1037 | struct ccw_device_private *priv; | |
1038 | ||
db6a6423 | 1039 | sch_set_cdev(sch, cdev); |
1da177e4 | 1040 | sch->driver = &io_subchannel_driver; |
2ec22984 | 1041 | cdev->ccwlock = sch->lock; |
fb6958a5 | 1042 | |
1da177e4 LT |
1043 | /* Init private data. */ |
1044 | priv = cdev->private; | |
78964268 CH |
1045 | priv->dev_id.devno = sch->schib.pmcw.dev; |
1046 | priv->dev_id.ssid = sch->schid.ssid; | |
1047 | priv->schid = sch->schid; | |
1da177e4 LT |
1048 | priv->state = DEV_STATE_NOT_OPER; |
1049 | INIT_LIST_HEAD(&priv->cmb_list); | |
1050 | init_waitqueue_head(&priv->wait_q); | |
1051 | init_timer(&priv->timer); | |
1052 | ||
1053 | /* Set an initial name for the device. */ | |
fb6958a5 CH |
1054 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", |
1055 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 LT |
1056 | |
1057 | /* Increase counter of devices currently in recognition. */ | |
1058 | atomic_inc(&ccw_device_init_count); | |
1059 | ||
1060 | /* Start async. device sensing. */ | |
2ec22984 | 1061 | spin_lock_irq(sch->lock); |
1da177e4 | 1062 | rc = ccw_device_recognition(cdev); |
2ec22984 | 1063 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
1064 | if (rc) { |
1065 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1066 | wake_up(&ccw_device_init_wq); | |
1067 | } | |
1068 | return rc; | |
1069 | } | |
1070 | ||
d7b5a4c9 CH |
1071 | static void ccw_device_move_to_sch(struct work_struct *work) |
1072 | { | |
1073 | struct ccw_device_private *priv; | |
1074 | int rc; | |
1075 | struct subchannel *sch; | |
1076 | struct ccw_device *cdev; | |
1077 | struct subchannel *former_parent; | |
1078 | ||
1079 | priv = container_of(work, struct ccw_device_private, kick_work); | |
1080 | sch = priv->sch; | |
1081 | cdev = priv->cdev; | |
1082 | former_parent = ccw_device_is_orphan(cdev) ? | |
1083 | NULL : to_subchannel(get_device(cdev->dev.parent)); | |
1084 | mutex_lock(&sch->reg_mutex); | |
1085 | /* Try to move the ccw device to its new subchannel. */ | |
1086 | rc = device_move(&cdev->dev, &sch->dev); | |
1087 | mutex_unlock(&sch->reg_mutex); | |
1088 | if (rc) { | |
1089 | CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel " | |
1090 | "0.%x.%04x failed (ret=%d)!\n", | |
1091 | cdev->private->dev_id.ssid, | |
1092 | cdev->private->dev_id.devno, sch->schid.ssid, | |
1093 | sch->schid.sch_no, rc); | |
1094 | css_sch_device_unregister(sch); | |
1095 | goto out; | |
1096 | } | |
1097 | if (former_parent) { | |
1098 | spin_lock_irq(former_parent->lock); | |
db6a6423 | 1099 | sch_set_cdev(former_parent, NULL); |
d7b5a4c9 CH |
1100 | spin_unlock_irq(former_parent->lock); |
1101 | css_sch_device_unregister(former_parent); | |
1102 | /* Reset intparm to zeroes. */ | |
1103 | former_parent->schib.pmcw.intparm = 0; | |
1104 | cio_modify(former_parent); | |
1105 | } | |
1106 | sch_attach_device(sch, cdev); | |
1107 | out: | |
1108 | if (former_parent) | |
1109 | put_device(&former_parent->dev); | |
1110 | put_device(&cdev->dev); | |
1111 | } | |
1112 | ||
602b20f2 CH |
1113 | static void io_subchannel_irq(struct subchannel *sch) |
1114 | { | |
1115 | struct ccw_device *cdev; | |
1116 | ||
db6a6423 | 1117 | cdev = sch_get_cdev(sch); |
602b20f2 CH |
1118 | |
1119 | CIO_TRACE_EVENT(3, "IRQ"); | |
1120 | CIO_TRACE_EVENT(3, sch->dev.bus_id); | |
1121 | if (cdev) | |
1122 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1123 | } | |
1124 | ||
1da177e4 | 1125 | static int |
8bbace7e | 1126 | io_subchannel_probe (struct subchannel *sch) |
1da177e4 | 1127 | { |
1da177e4 LT |
1128 | struct ccw_device *cdev; |
1129 | int rc; | |
1130 | unsigned long flags; | |
d7b5a4c9 | 1131 | struct ccw_dev_id dev_id; |
1da177e4 | 1132 | |
db6a6423 CH |
1133 | cdev = sch_get_cdev(sch); |
1134 | if (cdev) { | |
1da177e4 LT |
1135 | /* |
1136 | * This subchannel already has an associated ccw_device. | |
1137 | * Register it and exit. This happens for all early | |
1138 | * device, e.g. the console. | |
1139 | */ | |
e1031786 | 1140 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1141 | device_initialize(&cdev->dev); |
1142 | ccw_device_register(cdev); | |
1da177e4 LT |
1143 | /* |
1144 | * Check if the device is already online. If it is | |
1145 | * the reference count needs to be corrected | |
1146 | * (see ccw_device_online and css_init_done for the | |
1147 | * ugly details). | |
1148 | */ | |
1149 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1150 | cdev->private->state != DEV_STATE_OFFLINE && | |
1151 | cdev->private->state != DEV_STATE_BOXED) | |
1152 | get_device(&cdev->dev); | |
1153 | return 0; | |
1154 | } | |
d7b5a4c9 CH |
1155 | /* |
1156 | * First check if a fitting device may be found amongst the | |
1157 | * disconnected devices or in the orphanage. | |
1158 | */ | |
1159 | dev_id.devno = sch->schib.pmcw.dev; | |
1160 | dev_id.ssid = sch->schid.ssid; | |
cd6b4f27 CH |
1161 | /* Allocate I/O subchannel private data. */ |
1162 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1163 | GFP_KERNEL | GFP_DMA); | |
1164 | if (!sch->private) | |
1165 | return -ENOMEM; | |
d7b5a4c9 CH |
1166 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); |
1167 | if (!cdev) | |
1168 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1169 | &dev_id); | |
1170 | if (cdev) { | |
1171 | /* | |
1172 | * Schedule moving the device until when we have a registered | |
1173 | * subchannel to move to and succeed the probe. We can | |
1174 | * unregister later again, when the probe is through. | |
1175 | */ | |
1176 | cdev->private->sch = sch; | |
1177 | PREPARE_WORK(&cdev->private->kick_work, | |
1178 | ccw_device_move_to_sch); | |
1179 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1180 | return 0; | |
1181 | } | |
7674da77 | 1182 | cdev = io_subchannel_create_ccwdev(sch); |
cd6b4f27 CH |
1183 | if (IS_ERR(cdev)) { |
1184 | kfree(sch->private); | |
7674da77 | 1185 | return PTR_ERR(cdev); |
cd6b4f27 | 1186 | } |
8bbace7e | 1187 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1188 | if (rc) { |
2ec22984 | 1189 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 1190 | sch_set_cdev(sch, NULL); |
2ec22984 | 1191 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
1192 | if (cdev->dev.release) |
1193 | cdev->dev.release(&cdev->dev); | |
cd6b4f27 | 1194 | kfree(sch->private); |
1da177e4 LT |
1195 | } |
1196 | ||
1197 | return rc; | |
1198 | } | |
1199 | ||
1da177e4 | 1200 | static int |
8bbace7e | 1201 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1202 | { |
1203 | struct ccw_device *cdev; | |
1204 | unsigned long flags; | |
1205 | ||
db6a6423 CH |
1206 | cdev = sch_get_cdev(sch); |
1207 | if (!cdev) | |
1da177e4 | 1208 | return 0; |
1da177e4 LT |
1209 | /* Set ccw device to not operational and drop reference. */ |
1210 | spin_lock_irqsave(cdev->ccwlock, flags); | |
db6a6423 | 1211 | sch_set_cdev(sch, NULL); |
1da177e4 LT |
1212 | cdev->private->state = DEV_STATE_NOT_OPER; |
1213 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c CH |
1214 | ccw_device_unregister(cdev); |
1215 | put_device(&cdev->dev); | |
cd6b4f27 | 1216 | kfree(sch->private); |
1da177e4 LT |
1217 | return 0; |
1218 | } | |
1219 | ||
602b20f2 | 1220 | static int io_subchannel_notify(struct subchannel *sch, int event) |
1da177e4 LT |
1221 | { |
1222 | struct ccw_device *cdev; | |
1223 | ||
db6a6423 | 1224 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1225 | if (!cdev) |
1226 | return 0; | |
1227 | if (!cdev->drv) | |
1228 | return 0; | |
1229 | if (!cdev->online) | |
1230 | return 0; | |
1231 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; | |
1232 | } | |
1233 | ||
602b20f2 | 1234 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1235 | { |
1236 | struct ccw_device *cdev; | |
1237 | ||
db6a6423 | 1238 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1239 | if (cdev) |
1240 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1241 | } | |
1242 | ||
602b20f2 | 1243 | static void io_subchannel_ioterm(struct subchannel *sch) |
1da177e4 LT |
1244 | { |
1245 | struct ccw_device *cdev; | |
1246 | ||
db6a6423 | 1247 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1248 | if (!cdev) |
1249 | return; | |
d23861ff CH |
1250 | /* Internal I/O will be retried by the interrupt handler. */ |
1251 | if (cdev->private->flags.intretry) | |
1252 | return; | |
1da177e4 LT |
1253 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
1254 | if (cdev->handler) | |
1255 | cdev->handler(cdev, cdev->private->intparm, | |
1256 | ERR_PTR(-EIO)); | |
1257 | } | |
1258 | ||
1259 | static void | |
8bbace7e | 1260 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1261 | { |
1da177e4 LT |
1262 | struct ccw_device *cdev; |
1263 | int ret; | |
1264 | ||
db6a6423 | 1265 | cdev = sch_get_cdev(sch); |
1da177e4 | 1266 | |
a8237fc4 | 1267 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1268 | return; |
1269 | if (!sch->schib.pmcw.ena) | |
1270 | /* Nothing to do. */ | |
1271 | return; | |
1272 | ret = cio_disable_subchannel(sch); | |
1273 | if (ret != -EBUSY) | |
1274 | /* Subchannel is disabled, we're done. */ | |
1275 | return; | |
1276 | cdev->private->state = DEV_STATE_QUIESCE; | |
1277 | if (cdev->handler) | |
1278 | cdev->handler(cdev, cdev->private->intparm, | |
1279 | ERR_PTR(-EIO)); | |
1280 | ret = ccw_device_cancel_halt_clear(cdev); | |
1281 | if (ret == -EBUSY) { | |
1282 | ccw_device_set_timeout(cdev, HZ/10); | |
1283 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1284 | } | |
1285 | cio_disable_subchannel(sch); | |
1286 | } | |
1287 | ||
1288 | #ifdef CONFIG_CCW_CONSOLE | |
1289 | static struct ccw_device console_cdev; | |
1290 | static struct ccw_device_private console_private; | |
1291 | static int console_cdev_in_use; | |
1292 | ||
2ec22984 CH |
1293 | static DEFINE_SPINLOCK(ccw_console_lock); |
1294 | ||
1295 | spinlock_t * cio_get_console_lock(void) | |
1296 | { | |
1297 | return &ccw_console_lock; | |
1298 | } | |
1299 | ||
1da177e4 LT |
1300 | static int |
1301 | ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch) | |
1302 | { | |
1303 | int rc; | |
1304 | ||
cd6b4f27 CH |
1305 | /* Attach subchannel private data. */ |
1306 | sch->private = cio_get_console_priv(); | |
1307 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
1da177e4 | 1308 | /* Initialize the ccw_device structure. */ |
292888c8 | 1309 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1310 | rc = io_subchannel_recog(cdev, sch); |
1311 | if (rc) | |
1312 | return rc; | |
1313 | ||
1314 | /* Now wait for the async. recognition to come to an end. */ | |
1315 | spin_lock_irq(cdev->ccwlock); | |
1316 | while (!dev_fsm_final_state(cdev)) | |
1317 | wait_cons_dev(); | |
1318 | rc = -EIO; | |
1319 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1320 | goto out_unlock; | |
1321 | ccw_device_online(cdev); | |
1322 | while (!dev_fsm_final_state(cdev)) | |
1323 | wait_cons_dev(); | |
1324 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1325 | goto out_unlock; | |
1326 | rc = 0; | |
1327 | out_unlock: | |
1328 | spin_unlock_irq(cdev->ccwlock); | |
1329 | return 0; | |
1330 | } | |
1331 | ||
1332 | struct ccw_device * | |
1333 | ccw_device_probe_console(void) | |
1334 | { | |
1335 | struct subchannel *sch; | |
1336 | int ret; | |
1337 | ||
1338 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1339 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1340 | sch = cio_probe_console(); |
1341 | if (IS_ERR(sch)) { | |
1342 | console_cdev_in_use = 0; | |
1343 | return (void *) sch; | |
1344 | } | |
1345 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1346 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1347 | console_cdev.private = &console_private; | |
c1637532 | 1348 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1349 | ret = ccw_device_console_enable(&console_cdev, sch); |
1350 | if (ret) { | |
1351 | cio_release_console(); | |
1352 | console_cdev_in_use = 0; | |
1353 | return ERR_PTR(ret); | |
1354 | } | |
1355 | console_cdev.online = 1; | |
1356 | return &console_cdev; | |
1357 | } | |
1358 | #endif | |
1359 | ||
1360 | /* | |
1361 | * get ccw_device matching the busid, but only if owned by cdrv | |
1362 | */ | |
b0744bd2 CH |
1363 | static int |
1364 | __ccwdev_check_busid(struct device *dev, void *id) | |
1365 | { | |
1366 | char *bus_id; | |
1367 | ||
12975aef | 1368 | bus_id = id; |
b0744bd2 CH |
1369 | |
1370 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); | |
1371 | } | |
1372 | ||
1373 | ||
b2ffd8e9 CH |
1374 | /** |
1375 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1376 | * @cdrv: driver the device is owned by | |
1377 | * @bus_id: bus id of the device to be searched | |
1378 | * | |
1379 | * This function searches all devices owned by @cdrv for a device with a bus | |
1380 | * id matching @bus_id. | |
1381 | * Returns: | |
1382 | * If a match is found, its reference count of the found device is increased | |
1383 | * and it is returned; else %NULL is returned. | |
1384 | */ | |
1385 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1386 | const char *bus_id) | |
1da177e4 | 1387 | { |
b0744bd2 | 1388 | struct device *dev; |
1da177e4 LT |
1389 | struct device_driver *drv; |
1390 | ||
1391 | drv = get_driver(&cdrv->driver); | |
1392 | if (!drv) | |
b0744bd2 | 1393 | return NULL; |
1da177e4 | 1394 | |
b0744bd2 CH |
1395 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1396 | __ccwdev_check_busid); | |
1da177e4 LT |
1397 | put_driver(drv); |
1398 | ||
d2c993d8 | 1399 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1400 | } |
1401 | ||
1402 | /************************** device driver handling ************************/ | |
1403 | ||
1404 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1405 | * and release methods are initially very similar to the device_driver | |
1406 | * implementations, with the difference that they have ccw_device | |
1407 | * arguments. | |
1408 | * | |
1409 | * A ccw driver also contains the information that is needed for | |
1410 | * device matching. | |
1411 | */ | |
1412 | static int | |
1413 | ccw_device_probe (struct device *dev) | |
1414 | { | |
1415 | struct ccw_device *cdev = to_ccwdev(dev); | |
1416 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1417 | int ret; | |
1418 | ||
1419 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1420 | ||
1421 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1422 | ||
1423 | if (ret) { | |
d2c993d8 | 1424 | cdev->drv = NULL; |
1da177e4 LT |
1425 | return ret; |
1426 | } | |
1427 | ||
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | static int | |
1432 | ccw_device_remove (struct device *dev) | |
1433 | { | |
1434 | struct ccw_device *cdev = to_ccwdev(dev); | |
1435 | struct ccw_driver *cdrv = cdev->drv; | |
1436 | int ret; | |
1437 | ||
1da177e4 LT |
1438 | if (cdrv->remove) |
1439 | cdrv->remove(cdev); | |
1440 | if (cdev->online) { | |
1441 | cdev->online = 0; | |
1442 | spin_lock_irq(cdev->ccwlock); | |
1443 | ret = ccw_device_offline(cdev); | |
1444 | spin_unlock_irq(cdev->ccwlock); | |
1445 | if (ret == 0) | |
1446 | wait_event(cdev->private->wait_q, | |
1447 | dev_fsm_final_state(cdev)); | |
1448 | else | |
1449 | //FIXME: we can't fail! | |
e556bbbd CH |
1450 | CIO_MSG_EVENT(2, "ccw_device_offline returned %d, " |
1451 | "device 0.%x.%04x\n", | |
1452 | ret, cdev->private->dev_id.ssid, | |
1453 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1454 | } |
1455 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1456 | cdev->drv = NULL; |
1da177e4 LT |
1457 | return 0; |
1458 | } | |
1459 | ||
958974fb CH |
1460 | static void ccw_device_shutdown(struct device *dev) |
1461 | { | |
1462 | struct ccw_device *cdev; | |
1463 | ||
1464 | cdev = to_ccwdev(dev); | |
1465 | if (cdev->drv && cdev->drv->shutdown) | |
1466 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1467 | disable_cmf(cdev); |
958974fb CH |
1468 | } |
1469 | ||
8bbace7e CH |
1470 | struct bus_type ccw_bus_type = { |
1471 | .name = "ccw", | |
1472 | .match = ccw_bus_match, | |
1473 | .uevent = ccw_uevent, | |
1474 | .probe = ccw_device_probe, | |
1475 | .remove = ccw_device_remove, | |
958974fb | 1476 | .shutdown = ccw_device_shutdown, |
8bbace7e CH |
1477 | }; |
1478 | ||
b2ffd8e9 CH |
1479 | /** |
1480 | * ccw_driver_register() - register a ccw driver | |
1481 | * @cdriver: driver to be registered | |
1482 | * | |
1483 | * This function is mainly a wrapper around driver_register(). | |
1484 | * Returns: | |
1485 | * %0 on success and a negative error value on failure. | |
1486 | */ | |
1487 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1488 | { |
1489 | struct device_driver *drv = &cdriver->driver; | |
1490 | ||
1491 | drv->bus = &ccw_bus_type; | |
1492 | drv->name = cdriver->name; | |
4beee646 | 1493 | drv->owner = cdriver->owner; |
1da177e4 LT |
1494 | |
1495 | return driver_register(drv); | |
1496 | } | |
1497 | ||
b2ffd8e9 CH |
1498 | /** |
1499 | * ccw_driver_unregister() - deregister a ccw driver | |
1500 | * @cdriver: driver to be deregistered | |
1501 | * | |
1502 | * This function is mainly a wrapper around driver_unregister(). | |
1503 | */ | |
1504 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1505 | { |
1506 | driver_unregister(&cdriver->driver); | |
1507 | } | |
1508 | ||
a8237fc4 CH |
1509 | /* Helper func for qdio. */ |
1510 | struct subchannel_id | |
1511 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1512 | { | |
1513 | struct subchannel *sch; | |
1514 | ||
1515 | sch = to_subchannel(cdev->dev.parent); | |
1516 | return sch->schid; | |
1517 | } | |
1518 | ||
90ab1336 PO |
1519 | static int recovery_check(struct device *dev, void *data) |
1520 | { | |
1521 | struct ccw_device *cdev = to_ccwdev(dev); | |
1522 | int *redo = data; | |
1523 | ||
1524 | spin_lock_irq(cdev->ccwlock); | |
1525 | switch (cdev->private->state) { | |
1526 | case DEV_STATE_DISCONNECTED: | |
1527 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1528 | cdev->private->dev_id.ssid, | |
1529 | cdev->private->dev_id.devno); | |
1530 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1531 | *redo = 1; | |
1532 | break; | |
1533 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1534 | *redo = 1; | |
1535 | break; | |
1536 | } | |
1537 | spin_unlock_irq(cdev->ccwlock); | |
1538 | ||
1539 | return 0; | |
1540 | } | |
1541 | ||
4c629727 | 1542 | static void recovery_work_func(struct work_struct *unused) |
90ab1336 PO |
1543 | { |
1544 | int redo = 0; | |
1545 | ||
1546 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1547 | if (redo) { | |
1548 | spin_lock_irq(&recovery_lock); | |
1549 | if (!timer_pending(&recovery_timer)) { | |
1550 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1551 | recovery_phase++; | |
1552 | mod_timer(&recovery_timer, jiffies + | |
1553 | recovery_delay[recovery_phase] * HZ); | |
1554 | } | |
1555 | spin_unlock_irq(&recovery_lock); | |
1556 | } else | |
1557 | CIO_MSG_EVENT(2, "recovery: end\n"); | |
1558 | } | |
1559 | ||
4c629727 CH |
1560 | static DECLARE_WORK(recovery_work, recovery_work_func); |
1561 | ||
1562 | static void recovery_func(unsigned long data) | |
1563 | { | |
1564 | /* | |
1565 | * We can't do our recovery in softirq context and it's not | |
1566 | * performance critical, so we schedule it. | |
1567 | */ | |
1568 | schedule_work(&recovery_work); | |
1569 | } | |
1570 | ||
90ab1336 PO |
1571 | void ccw_device_schedule_recovery(void) |
1572 | { | |
1573 | unsigned long flags; | |
1574 | ||
1575 | CIO_MSG_EVENT(2, "recovery: schedule\n"); | |
1576 | spin_lock_irqsave(&recovery_lock, flags); | |
1577 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1578 | recovery_phase = 0; | |
1579 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1580 | } | |
1581 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1582 | } | |
1583 | ||
1da177e4 LT |
1584 | MODULE_LICENSE("GPL"); |
1585 | EXPORT_SYMBOL(ccw_device_set_online); | |
1586 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1587 | EXPORT_SYMBOL(ccw_driver_register); | |
1588 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1589 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1590 | EXPORT_SYMBOL(ccw_bus_type); | |
1591 | EXPORT_SYMBOL(ccw_device_work); | |
1592 | EXPORT_SYMBOL(ccw_device_notify_work); | |
a8237fc4 | 1593 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |