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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> | |
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 | 26 | |
0ae7a7b2 | 27 | #include "chp.h" |
1da177e4 | 28 | #include "cio.h" |
d7b5a4c9 | 29 | #include "cio_debug.h" |
1da177e4 LT |
30 | #include "css.h" |
31 | #include "device.h" | |
32 | #include "ioasm.h" | |
cd6b4f27 | 33 | #include "io_sch.h" |
1da177e4 | 34 | |
90ab1336 | 35 | static struct timer_list recovery_timer; |
486d0a00 | 36 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
37 | static int recovery_phase; |
38 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
39 | ||
1da177e4 LT |
40 | /******************* bus type handling ***********************/ |
41 | ||
42 | /* The Linux driver model distinguishes between a bus type and | |
43 | * the bus itself. Of course we only have one channel | |
44 | * subsystem driver and one channel system per machine, but | |
45 | * we still use the abstraction. T.R. says it's a good idea. */ | |
46 | static int | |
47 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
48 | { | |
49 | struct ccw_device *cdev = to_ccwdev(dev); | |
50 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
51 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
52 | ||
53 | if (!ids) | |
54 | return 0; | |
55 | ||
56 | found = ccw_device_id_match(ids, &cdev->id); | |
57 | if (!found) | |
58 | return 0; | |
59 | ||
60 | cdev->id.driver_info = found->driver_info; | |
61 | ||
62 | return 1; | |
63 | } | |
64 | ||
db0c2d59 PO |
65 | /* Store modalias string delimited by prefix/suffix string into buffer with |
66 | * specified size. Return length of resulting string (excluding trailing '\0') | |
67 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 68 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 69 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 70 | { |
db0c2d59 | 71 | int len; |
1da177e4 | 72 | |
cfbe9bb2 | 73 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
74 | if (len > size) |
75 | return len; | |
76 | buf += len; | |
77 | size -= len; | |
1da177e4 | 78 | |
db0c2d59 PO |
79 | if (id->dev_type != 0) |
80 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
81 | id->dev_model, suffix); | |
82 | else | |
83 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 84 | |
db0c2d59 PO |
85 | return len; |
86 | } | |
87 | ||
88 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
89 | * non-zero otherwise. */ | |
7eff2e7a | 90 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
91 | { |
92 | struct ccw_device *cdev = to_ccwdev(dev); | |
93 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
94 | int ret; |
95 | char modalias_buf[30]; | |
1da177e4 | 96 | |
db0c2d59 | 97 | /* CU_TYPE= */ |
7eff2e7a | 98 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
99 | if (ret) |
100 | return ret; | |
db0c2d59 PO |
101 | |
102 | /* CU_MODEL= */ | |
7eff2e7a | 103 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
104 | if (ret) |
105 | return ret; | |
1da177e4 LT |
106 | |
107 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 108 | /* DEV_TYPE= */ |
7eff2e7a | 109 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
110 | if (ret) |
111 | return ret; | |
1da177e4 | 112 | |
db0c2d59 | 113 | /* DEV_MODEL= */ |
7eff2e7a | 114 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
115 | if (ret) |
116 | return ret; | |
db0c2d59 PO |
117 | |
118 | /* MODALIAS= */ | |
cfbe9bb2 | 119 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
120 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
121 | return ret; | |
1da177e4 LT |
122 | } |
123 | ||
8bbace7e | 124 | struct bus_type ccw_bus_type; |
1da177e4 | 125 | |
602b20f2 CH |
126 | static void io_subchannel_irq(struct subchannel *); |
127 | static int io_subchannel_probe(struct subchannel *); | |
128 | static int io_subchannel_remove(struct subchannel *); | |
129 | static int io_subchannel_notify(struct subchannel *, int); | |
130 | static void io_subchannel_verify(struct subchannel *); | |
131 | static void io_subchannel_ioterm(struct subchannel *); | |
8bbace7e | 132 | static void io_subchannel_shutdown(struct subchannel *); |
1da177e4 | 133 | |
f7e5d67c | 134 | static struct css_driver io_subchannel_driver = { |
4beee646 | 135 | .owner = THIS_MODULE, |
1da177e4 | 136 | .subchannel_type = SUBCHANNEL_TYPE_IO, |
25b7bb58 | 137 | .name = "io_subchannel", |
1da177e4 LT |
138 | .irq = io_subchannel_irq, |
139 | .notify = io_subchannel_notify, | |
140 | .verify = io_subchannel_verify, | |
141 | .termination = io_subchannel_ioterm, | |
8bbace7e CH |
142 | .probe = io_subchannel_probe, |
143 | .remove = io_subchannel_remove, | |
144 | .shutdown = io_subchannel_shutdown, | |
1da177e4 LT |
145 | }; |
146 | ||
147 | struct workqueue_struct *ccw_device_work; | |
148 | struct workqueue_struct *ccw_device_notify_work; | |
40154b82 PO |
149 | wait_queue_head_t ccw_device_init_wq; |
150 | atomic_t ccw_device_init_count; | |
1da177e4 | 151 | |
90ab1336 PO |
152 | static void recovery_func(unsigned long data); |
153 | ||
1da177e4 LT |
154 | static int __init |
155 | init_ccw_bus_type (void) | |
156 | { | |
157 | int ret; | |
158 | ||
159 | init_waitqueue_head(&ccw_device_init_wq); | |
160 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 161 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 LT |
162 | |
163 | ccw_device_work = create_singlethread_workqueue("cio"); | |
164 | if (!ccw_device_work) | |
165 | return -ENOMEM; /* FIXME: better errno ? */ | |
166 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); | |
167 | if (!ccw_device_notify_work) { | |
168 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
169 | goto out_err; | |
170 | } | |
171 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); | |
172 | if (!slow_path_wq) { | |
173 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
174 | goto out_err; | |
175 | } | |
176 | if ((ret = bus_register (&ccw_bus_type))) | |
177 | goto out_err; | |
178 | ||
25b7bb58 CH |
179 | ret = css_driver_register(&io_subchannel_driver); |
180 | if (ret) | |
1da177e4 LT |
181 | goto out_err; |
182 | ||
183 | wait_event(ccw_device_init_wq, | |
184 | atomic_read(&ccw_device_init_count) == 0); | |
185 | flush_workqueue(ccw_device_work); | |
186 | return 0; | |
187 | out_err: | |
188 | if (ccw_device_work) | |
189 | destroy_workqueue(ccw_device_work); | |
190 | if (ccw_device_notify_work) | |
191 | destroy_workqueue(ccw_device_notify_work); | |
192 | if (slow_path_wq) | |
193 | destroy_workqueue(slow_path_wq); | |
194 | return ret; | |
195 | } | |
196 | ||
197 | static void __exit | |
198 | cleanup_ccw_bus_type (void) | |
199 | { | |
25b7bb58 | 200 | css_driver_unregister(&io_subchannel_driver); |
1da177e4 LT |
201 | bus_unregister(&ccw_bus_type); |
202 | destroy_workqueue(ccw_device_notify_work); | |
203 | destroy_workqueue(ccw_device_work); | |
204 | } | |
205 | ||
206 | subsys_initcall(init_ccw_bus_type); | |
207 | module_exit(cleanup_ccw_bus_type); | |
208 | ||
209 | /************************ device handling **************************/ | |
210 | ||
211 | /* | |
212 | * A ccw_device has some interfaces in sysfs in addition to the | |
213 | * standard ones. | |
214 | * The following entries are designed to export the information which | |
215 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
216 | * are obvious, so they don't have an entry :) | |
217 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
218 | */ | |
219 | static ssize_t | |
3fd3c0a5 | 220 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
221 | { |
222 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 223 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
224 | ssize_t ret = 0; |
225 | int chp; | |
7ad6a249 PO |
226 | int mask; |
227 | ||
228 | for (chp = 0; chp < 8; chp++) { | |
229 | mask = 0x80 >> chp; | |
230 | if (ssd->path_mask & mask) | |
231 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
232 | else | |
233 | ret += sprintf(buf + ret, "00 "); | |
234 | } | |
1da177e4 LT |
235 | ret += sprintf (buf+ret, "\n"); |
236 | return min((ssize_t)PAGE_SIZE, ret); | |
237 | } | |
238 | ||
239 | static ssize_t | |
3fd3c0a5 | 240 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
241 | { |
242 | struct subchannel *sch = to_subchannel(dev); | |
243 | struct pmcw *pmcw = &sch->schib.pmcw; | |
244 | ||
245 | return sprintf (buf, "%02x %02x %02x\n", | |
246 | pmcw->pim, pmcw->pam, pmcw->pom); | |
247 | } | |
248 | ||
249 | static ssize_t | |
3fd3c0a5 | 250 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
251 | { |
252 | struct ccw_device *cdev = to_ccwdev(dev); | |
253 | struct ccw_device_id *id = &(cdev->id); | |
254 | ||
255 | if (id->dev_type != 0) | |
256 | return sprintf(buf, "%04x/%02x\n", | |
257 | id->dev_type, id->dev_model); | |
258 | else | |
259 | return sprintf(buf, "n/a\n"); | |
260 | } | |
261 | ||
262 | static ssize_t | |
3fd3c0a5 | 263 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
264 | { |
265 | struct ccw_device *cdev = to_ccwdev(dev); | |
266 | struct ccw_device_id *id = &(cdev->id); | |
267 | ||
268 | return sprintf(buf, "%04x/%02x\n", | |
269 | id->cu_type, id->cu_model); | |
270 | } | |
271 | ||
f1fc78a8 BB |
272 | static ssize_t |
273 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
274 | { | |
275 | struct ccw_device *cdev = to_ccwdev(dev); | |
276 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 277 | int len; |
f1fc78a8 | 278 | |
086a6c62 | 279 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
280 | |
281 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
282 | } |
283 | ||
1da177e4 | 284 | static ssize_t |
3fd3c0a5 | 285 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
286 | { |
287 | struct ccw_device *cdev = to_ccwdev(dev); | |
288 | ||
289 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
290 | } | |
291 | ||
d7b5a4c9 CH |
292 | int ccw_device_is_orphan(struct ccw_device *cdev) |
293 | { | |
294 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
295 | } | |
296 | ||
ef99516c | 297 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 298 | { |
7674da77 | 299 | if (test_and_clear_bit(1, &cdev->private->registered)) |
ef99516c | 300 | device_del(&cdev->dev); |
7674da77 CH |
301 | } |
302 | ||
59a8a6e2 CH |
303 | static void ccw_device_remove_orphan_cb(struct device *dev) |
304 | { | |
305 | struct ccw_device *cdev = to_ccwdev(dev); | |
306 | ||
307 | ccw_device_unregister(cdev); | |
308 | put_device(&cdev->dev); | |
309 | } | |
310 | ||
311 | static void ccw_device_remove_sch_cb(struct device *dev) | |
312 | { | |
313 | struct subchannel *sch; | |
314 | ||
315 | sch = to_subchannel(dev); | |
316 | css_sch_device_unregister(sch); | |
317 | /* Reset intparm to zeroes. */ | |
318 | sch->schib.pmcw.intparm = 0; | |
319 | cio_modify(sch); | |
320 | put_device(&sch->dev); | |
321 | } | |
322 | ||
1da177e4 LT |
323 | static void |
324 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
325 | { | |
d7b5a4c9 | 326 | unsigned long flags; |
59a8a6e2 CH |
327 | int rc; |
328 | ||
1da177e4 LT |
329 | /* |
330 | * Forced offline in disconnected state means | |
331 | * 'throw away device'. | |
332 | */ | |
d7b5a4c9 | 333 | if (ccw_device_is_orphan(cdev)) { |
59a8a6e2 CH |
334 | /* |
335 | * Deregister ccw device. | |
336 | * Unfortunately, we cannot do this directly from the | |
337 | * attribute method. | |
338 | */ | |
d7b5a4c9 CH |
339 | spin_lock_irqsave(cdev->ccwlock, flags); |
340 | cdev->private->state = DEV_STATE_NOT_OPER; | |
341 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
59a8a6e2 CH |
342 | rc = device_schedule_callback(&cdev->dev, |
343 | ccw_device_remove_orphan_cb); | |
344 | if (rc) | |
139b83dd | 345 | CIO_MSG_EVENT(0, "Couldn't unregister orphan " |
e556bbbd CH |
346 | "0.%x.%04x\n", |
347 | cdev->private->dev_id.ssid, | |
348 | cdev->private->dev_id.devno); | |
59a8a6e2 | 349 | return; |
d7b5a4c9 | 350 | } |
59a8a6e2 CH |
351 | /* Deregister subchannel, which will kill the ccw device. */ |
352 | rc = device_schedule_callback(cdev->dev.parent, | |
353 | ccw_device_remove_sch_cb); | |
354 | if (rc) | |
139b83dd | 355 | CIO_MSG_EVENT(0, "Couldn't unregister disconnected device " |
e556bbbd CH |
356 | "0.%x.%04x\n", |
357 | cdev->private->dev_id.ssid, | |
358 | cdev->private->dev_id.devno); | |
1da177e4 LT |
359 | } |
360 | ||
b2ffd8e9 CH |
361 | /** |
362 | * ccw_device_set_offline() - disable a ccw device for I/O | |
363 | * @cdev: target ccw device | |
364 | * | |
365 | * This function calls the driver's set_offline() function for @cdev, if | |
366 | * given, and then disables @cdev. | |
367 | * Returns: | |
368 | * %0 on success and a negative error value on failure. | |
369 | * Context: | |
370 | * enabled, ccw device lock not held | |
371 | */ | |
372 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 LT |
373 | { |
374 | int ret; | |
375 | ||
376 | if (!cdev) | |
377 | return -ENODEV; | |
378 | if (!cdev->online || !cdev->drv) | |
379 | return -EINVAL; | |
380 | ||
381 | if (cdev->drv->set_offline) { | |
382 | ret = cdev->drv->set_offline(cdev); | |
383 | if (ret != 0) | |
384 | return ret; | |
385 | } | |
386 | cdev->online = 0; | |
387 | spin_lock_irq(cdev->ccwlock); | |
388 | ret = ccw_device_offline(cdev); | |
389 | if (ret == -ENODEV) { | |
390 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
391 | cdev->private->state = DEV_STATE_OFFLINE; | |
392 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
393 | } | |
394 | spin_unlock_irq(cdev->ccwlock); | |
395 | return ret; | |
396 | } | |
397 | spin_unlock_irq(cdev->ccwlock); | |
398 | if (ret == 0) | |
399 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
400 | else { | |
139b83dd | 401 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
402 | "device 0.%x.%04x\n", |
403 | ret, cdev->private->dev_id.ssid, | |
404 | cdev->private->dev_id.devno); | |
1da177e4 LT |
405 | cdev->online = 1; |
406 | } | |
407 | return ret; | |
408 | } | |
409 | ||
b2ffd8e9 CH |
410 | /** |
411 | * ccw_device_set_online() - enable a ccw device for I/O | |
412 | * @cdev: target ccw device | |
413 | * | |
414 | * This function first enables @cdev and then calls the driver's set_online() | |
415 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
416 | * disabled again. | |
417 | * Returns: | |
418 | * %0 on success and a negative error value on failure. | |
419 | * Context: | |
420 | * enabled, ccw device lock not held | |
421 | */ | |
422 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
423 | { |
424 | int ret; | |
425 | ||
426 | if (!cdev) | |
427 | return -ENODEV; | |
428 | if (cdev->online || !cdev->drv) | |
429 | return -EINVAL; | |
430 | ||
431 | spin_lock_irq(cdev->ccwlock); | |
432 | ret = ccw_device_online(cdev); | |
433 | spin_unlock_irq(cdev->ccwlock); | |
434 | if (ret == 0) | |
435 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
436 | else { | |
139b83dd | 437 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
438 | "device 0.%x.%04x\n", |
439 | ret, cdev->private->dev_id.ssid, | |
440 | cdev->private->dev_id.devno); | |
1da177e4 LT |
441 | return ret; |
442 | } | |
443 | if (cdev->private->state != DEV_STATE_ONLINE) | |
444 | return -ENODEV; | |
445 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { | |
446 | cdev->online = 1; | |
447 | return 0; | |
448 | } | |
449 | spin_lock_irq(cdev->ccwlock); | |
450 | ret = ccw_device_offline(cdev); | |
451 | spin_unlock_irq(cdev->ccwlock); | |
452 | if (ret == 0) | |
453 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
e556bbbd | 454 | else |
139b83dd | 455 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
456 | "device 0.%x.%04x\n", |
457 | ret, cdev->private->dev_id.ssid, | |
458 | cdev->private->dev_id.devno); | |
6cadb78b | 459 | return (ret == 0) ? -ENODEV : ret; |
1da177e4 LT |
460 | } |
461 | ||
f5ba6c86 CH |
462 | static void online_store_handle_offline(struct ccw_device *cdev) |
463 | { | |
464 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
465 | ccw_device_remove_disconnected(cdev); | |
466 | else if (cdev->drv && cdev->drv->set_offline) | |
467 | ccw_device_set_offline(cdev); | |
468 | } | |
469 | ||
470 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
471 | { | |
472 | int ret; | |
473 | ||
474 | /* Do device recognition, if needed. */ | |
475 | if (cdev->id.cu_type == 0) { | |
476 | ret = ccw_device_recognition(cdev); | |
477 | if (ret) { | |
e556bbbd CH |
478 | CIO_MSG_EVENT(0, "Couldn't start recognition " |
479 | "for device 0.%x.%04x (ret=%d)\n", | |
480 | cdev->private->dev_id.ssid, | |
481 | cdev->private->dev_id.devno, ret); | |
f5ba6c86 CH |
482 | return ret; |
483 | } | |
484 | wait_event(cdev->private->wait_q, | |
485 | cdev->private->flags.recog_done); | |
486 | } | |
487 | if (cdev->drv && cdev->drv->set_online) | |
488 | ccw_device_set_online(cdev); | |
489 | return 0; | |
490 | } | |
491 | static void online_store_handle_online(struct ccw_device *cdev, int force) | |
492 | { | |
493 | int ret; | |
494 | ||
495 | ret = online_store_recog_and_online(cdev); | |
496 | if (ret) | |
497 | return; | |
498 | if (force && cdev->private->state == DEV_STATE_BOXED) { | |
499 | ret = ccw_device_stlck(cdev); | |
500 | if (ret) { | |
e556bbbd CH |
501 | dev_warn(&cdev->dev, |
502 | "ccw_device_stlck returned %d!\n", ret); | |
f5ba6c86 CH |
503 | return; |
504 | } | |
505 | if (cdev->id.cu_type == 0) | |
506 | cdev->private->state = DEV_STATE_NOT_OPER; | |
507 | online_store_recog_and_online(cdev); | |
508 | } | |
509 | ||
510 | } | |
511 | ||
512 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
513 | const char *buf, size_t count) | |
1da177e4 LT |
514 | { |
515 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
516 | int force, ret; |
517 | unsigned long i; | |
1da177e4 | 518 | |
973bd993 | 519 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 LT |
520 | return -EAGAIN; |
521 | ||
522 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
523 | atomic_set(&cdev->private->onoff, 0); | |
524 | return -EINVAL; | |
525 | } | |
526 | if (!strncmp(buf, "force\n", count)) { | |
527 | force = 1; | |
528 | i = 1; | |
2f972202 | 529 | ret = 0; |
1da177e4 LT |
530 | } else { |
531 | force = 0; | |
2f972202 | 532 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 533 | } |
2f972202 CH |
534 | if (ret) |
535 | goto out; | |
f5ba6c86 CH |
536 | switch (i) { |
537 | case 0: | |
538 | online_store_handle_offline(cdev); | |
2f972202 | 539 | ret = count; |
f5ba6c86 CH |
540 | break; |
541 | case 1: | |
542 | online_store_handle_online(cdev, force); | |
2f972202 | 543 | ret = count; |
f5ba6c86 CH |
544 | break; |
545 | default: | |
2f972202 | 546 | ret = -EINVAL; |
1da177e4 | 547 | } |
2f972202 | 548 | out: |
1da177e4 LT |
549 | if (cdev->drv) |
550 | module_put(cdev->drv->owner); | |
551 | atomic_set(&cdev->private->onoff, 0); | |
2f972202 | 552 | return ret; |
1da177e4 LT |
553 | } |
554 | ||
555 | static ssize_t | |
3fd3c0a5 | 556 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
557 | { |
558 | struct ccw_device *cdev = to_ccwdev(dev); | |
559 | struct subchannel *sch; | |
560 | ||
d7b5a4c9 CH |
561 | if (ccw_device_is_orphan(cdev)) |
562 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
563 | switch (cdev->private->state) { |
564 | case DEV_STATE_BOXED: | |
565 | return sprintf(buf, "boxed\n"); | |
566 | case DEV_STATE_DISCONNECTED: | |
567 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
568 | case DEV_STATE_NOT_OPER: | |
569 | sch = to_subchannel(dev->parent); | |
570 | if (!sch->lpm) | |
571 | return sprintf(buf, "no path\n"); | |
572 | else | |
573 | return sprintf(buf, "no device\n"); | |
574 | default: | |
575 | /* All other states considered fine. */ | |
576 | return sprintf(buf, "good\n"); | |
577 | } | |
578 | } | |
579 | ||
580 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
581 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
582 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
583 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 584 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 585 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
586 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
587 | ||
588 | static struct attribute * subch_attrs[] = { | |
589 | &dev_attr_chpids.attr, | |
590 | &dev_attr_pimpampom.attr, | |
591 | NULL, | |
592 | }; | |
593 | ||
594 | static struct attribute_group subch_attr_group = { | |
595 | .attrs = subch_attrs, | |
596 | }; | |
597 | ||
529192f3 CH |
598 | struct attribute_group *subch_attr_groups[] = { |
599 | &subch_attr_group, | |
600 | NULL, | |
601 | }; | |
1da177e4 LT |
602 | |
603 | static struct attribute * ccwdev_attrs[] = { | |
604 | &dev_attr_devtype.attr, | |
605 | &dev_attr_cutype.attr, | |
f1fc78a8 | 606 | &dev_attr_modalias.attr, |
1da177e4 LT |
607 | &dev_attr_online.attr, |
608 | &dev_attr_cmb_enable.attr, | |
609 | &dev_attr_availability.attr, | |
610 | NULL, | |
611 | }; | |
612 | ||
613 | static struct attribute_group ccwdev_attr_group = { | |
614 | .attrs = ccwdev_attrs, | |
615 | }; | |
616 | ||
f7e5d67c | 617 | static struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
618 | &ccwdev_attr_group, |
619 | NULL, | |
620 | }; | |
1da177e4 LT |
621 | |
622 | /* this is a simple abstraction for device_register that sets the | |
623 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 624 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
625 | { |
626 | struct device *dev = &cdev->dev; | |
627 | int ret; | |
628 | ||
629 | dev->bus = &ccw_bus_type; | |
630 | ||
631 | if ((ret = device_add(dev))) | |
632 | return ret; | |
633 | ||
634 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
635 | return ret; |
636 | } | |
637 | ||
b0744bd2 | 638 | struct match_data { |
78964268 | 639 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
640 | struct ccw_device * sibling; |
641 | }; | |
642 | ||
643 | static int | |
644 | match_devno(struct device * dev, void * data) | |
645 | { | |
78964268 | 646 | struct match_data * d = data; |
b0744bd2 CH |
647 | struct ccw_device * cdev; |
648 | ||
649 | cdev = to_ccwdev(dev); | |
650 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 651 | !ccw_device_is_orphan(cdev) && |
78964268 | 652 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 653 | (cdev != d->sibling)) |
b0744bd2 | 654 | return 1; |
b0744bd2 CH |
655 | return 0; |
656 | } | |
657 | ||
78964268 CH |
658 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
659 | struct ccw_device *sibling) | |
1da177e4 | 660 | { |
1da177e4 | 661 | struct device *dev; |
292888c8 | 662 | struct match_data data; |
1da177e4 | 663 | |
78964268 | 664 | data.dev_id = *dev_id; |
292888c8 | 665 | data.sibling = sibling; |
e5945b4f | 666 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 667 | |
b0744bd2 | 668 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
669 | } |
670 | ||
d7b5a4c9 CH |
671 | static int match_orphan(struct device *dev, void *data) |
672 | { | |
673 | struct ccw_dev_id *dev_id; | |
674 | struct ccw_device *cdev; | |
675 | ||
676 | dev_id = data; | |
677 | cdev = to_ccwdev(dev); | |
678 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
679 | } | |
680 | ||
681 | static struct ccw_device * | |
682 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
683 | struct ccw_dev_id *dev_id) | |
684 | { | |
685 | struct device *dev; | |
686 | ||
687 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
688 | match_orphan); | |
689 | ||
690 | return dev ? to_ccwdev(dev) : NULL; | |
691 | } | |
692 | ||
1da177e4 | 693 | static void |
c1637532 | 694 | ccw_device_add_changed(struct work_struct *work) |
1da177e4 | 695 | { |
c1637532 | 696 | struct ccw_device_private *priv; |
1da177e4 LT |
697 | struct ccw_device *cdev; |
698 | ||
c1637532 MS |
699 | priv = container_of(work, struct ccw_device_private, kick_work); |
700 | cdev = priv->cdev; | |
1da177e4 LT |
701 | if (device_add(&cdev->dev)) { |
702 | put_device(&cdev->dev); | |
703 | return; | |
704 | } | |
705 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
706 | } |
707 | ||
d7b5a4c9 | 708 | void ccw_device_do_unreg_rereg(struct work_struct *work) |
1da177e4 | 709 | { |
c1637532 | 710 | struct ccw_device_private *priv; |
1da177e4 LT |
711 | struct ccw_device *cdev; |
712 | struct subchannel *sch; | |
1da177e4 | 713 | |
c1637532 MS |
714 | priv = container_of(work, struct ccw_device_private, kick_work); |
715 | cdev = priv->cdev; | |
1da177e4 | 716 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 717 | |
ef99516c | 718 | ccw_device_unregister(cdev); |
1da177e4 | 719 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 720 | ccw_device_add_changed); |
1da177e4 LT |
721 | queue_work(ccw_device_work, &cdev->private->kick_work); |
722 | } | |
723 | ||
724 | static void | |
725 | ccw_device_release(struct device *dev) | |
726 | { | |
727 | struct ccw_device *cdev; | |
728 | ||
729 | cdev = to_ccwdev(dev); | |
730 | kfree(cdev->private); | |
731 | kfree(cdev); | |
732 | } | |
733 | ||
7674da77 CH |
734 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
735 | { | |
736 | struct ccw_device *cdev; | |
737 | ||
738 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
739 | if (cdev) { | |
740 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
741 | GFP_KERNEL | GFP_DMA); | |
742 | if (cdev->private) | |
743 | return cdev; | |
744 | } | |
745 | kfree(cdev); | |
746 | return ERR_PTR(-ENOMEM); | |
747 | } | |
748 | ||
749 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
750 | struct ccw_device *cdev) | |
751 | { | |
752 | cdev->private->cdev = cdev; | |
753 | atomic_set(&cdev->private->onoff, 0); | |
754 | cdev->dev.parent = &sch->dev; | |
755 | cdev->dev.release = ccw_device_release; | |
33583c36 | 756 | INIT_WORK(&cdev->private->kick_work, NULL); |
ef99516c | 757 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
758 | /* Do first half of device_register. */ |
759 | device_initialize(&cdev->dev); | |
760 | if (!get_device(&sch->dev)) { | |
761 | if (cdev->dev.release) | |
762 | cdev->dev.release(&cdev->dev); | |
763 | return -ENODEV; | |
764 | } | |
765 | return 0; | |
766 | } | |
767 | ||
768 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
769 | { | |
770 | struct ccw_device *cdev; | |
771 | int ret; | |
772 | ||
773 | cdev = io_subchannel_allocate_dev(sch); | |
774 | if (!IS_ERR(cdev)) { | |
775 | ret = io_subchannel_initialize_dev(sch, cdev); | |
776 | if (ret) { | |
777 | kfree(cdev); | |
778 | cdev = ERR_PTR(ret); | |
779 | } | |
780 | } | |
781 | return cdev; | |
782 | } | |
783 | ||
d7b5a4c9 CH |
784 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
785 | ||
786 | static void sch_attach_device(struct subchannel *sch, | |
787 | struct ccw_device *cdev) | |
788 | { | |
82b7ac05 | 789 | css_update_ssd_info(sch); |
d7b5a4c9 | 790 | spin_lock_irq(sch->lock); |
db6a6423 | 791 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
792 | cdev->private->schid = sch->schid; |
793 | cdev->ccwlock = sch->lock; | |
794 | device_trigger_reprobe(sch); | |
795 | spin_unlock_irq(sch->lock); | |
796 | } | |
797 | ||
798 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
799 | struct ccw_device *cdev) | |
800 | { | |
801 | struct subchannel *other_sch; | |
802 | int ret; | |
803 | ||
804 | other_sch = to_subchannel(get_device(cdev->dev.parent)); | |
805 | ret = device_move(&cdev->dev, &sch->dev); | |
806 | if (ret) { | |
139b83dd | 807 | CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed " |
d7b5a4c9 CH |
808 | "(ret=%d)!\n", cdev->private->dev_id.ssid, |
809 | cdev->private->dev_id.devno, ret); | |
810 | put_device(&other_sch->dev); | |
811 | return; | |
812 | } | |
db6a6423 | 813 | sch_set_cdev(other_sch, NULL); |
d7b5a4c9 CH |
814 | /* No need to keep a subchannel without ccw device around. */ |
815 | css_sch_device_unregister(other_sch); | |
816 | put_device(&other_sch->dev); | |
817 | sch_attach_device(sch, cdev); | |
818 | } | |
819 | ||
820 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
821 | struct ccw_device *cdev) | |
822 | { | |
823 | int ret; | |
824 | ||
825 | /* Try to move the ccw device to its new subchannel. */ | |
826 | ret = device_move(&cdev->dev, &sch->dev); | |
827 | if (ret) { | |
828 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
829 | "failed (ret=%d)!\n", | |
830 | cdev->private->dev_id.ssid, | |
831 | cdev->private->dev_id.devno, ret); | |
832 | return; | |
833 | } | |
834 | sch_attach_device(sch, cdev); | |
835 | } | |
836 | ||
837 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
838 | { | |
839 | struct ccw_device *cdev; | |
840 | ||
841 | /* Need to allocate a new ccw device. */ | |
842 | cdev = io_subchannel_create_ccwdev(sch); | |
843 | if (IS_ERR(cdev)) { | |
844 | /* OK, we did everything we could... */ | |
845 | css_sch_device_unregister(sch); | |
846 | return; | |
847 | } | |
848 | spin_lock_irq(sch->lock); | |
db6a6423 | 849 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
850 | spin_unlock_irq(sch->lock); |
851 | /* Start recognition for the new ccw device. */ | |
852 | if (io_subchannel_recog(cdev, sch)) { | |
853 | spin_lock_irq(sch->lock); | |
db6a6423 | 854 | sch_set_cdev(sch, NULL); |
d7b5a4c9 CH |
855 | spin_unlock_irq(sch->lock); |
856 | if (cdev->dev.release) | |
857 | cdev->dev.release(&cdev->dev); | |
858 | css_sch_device_unregister(sch); | |
859 | } | |
860 | } | |
861 | ||
862 | ||
863 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
864 | { | |
865 | struct ccw_device_private *priv; | |
866 | struct ccw_device *cdev; | |
867 | struct ccw_device *replacing_cdev; | |
868 | struct subchannel *sch; | |
869 | int ret; | |
870 | struct channel_subsystem *css; | |
871 | struct ccw_dev_id dev_id; | |
872 | ||
873 | priv = container_of(work, struct ccw_device_private, kick_work); | |
874 | cdev = priv->cdev; | |
875 | sch = to_subchannel(cdev->dev.parent); | |
876 | css = to_css(sch->dev.parent); | |
877 | dev_id.devno = sch->schib.pmcw.dev; | |
878 | dev_id.ssid = sch->schid.ssid; | |
879 | ||
880 | /* | |
881 | * Move the orphaned ccw device to the orphanage so the replacing | |
882 | * ccw device can take its place on the subchannel. | |
883 | */ | |
884 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev); | |
885 | if (ret) { | |
886 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
887 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
888 | cdev->private->dev_id.devno, ret); | |
889 | return; | |
890 | } | |
891 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
892 | /* | |
893 | * Search for the replacing ccw device | |
894 | * - among the disconnected devices | |
895 | * - in the orphanage | |
896 | */ | |
897 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
898 | if (replacing_cdev) { | |
899 | sch_attach_disconnected_device(sch, replacing_cdev); | |
900 | return; | |
901 | } | |
902 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
903 | if (replacing_cdev) { | |
904 | sch_attach_orphaned_device(sch, replacing_cdev); | |
905 | return; | |
906 | } | |
907 | sch_create_and_recog_new_device(sch); | |
908 | } | |
909 | ||
1da177e4 LT |
910 | /* |
911 | * Register recognized device. | |
912 | */ | |
913 | static void | |
c1637532 | 914 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 915 | { |
c1637532 | 916 | struct ccw_device_private *priv; |
1da177e4 LT |
917 | struct ccw_device *cdev; |
918 | struct subchannel *sch; | |
919 | int ret; | |
920 | unsigned long flags; | |
921 | ||
c1637532 MS |
922 | priv = container_of(work, struct ccw_device_private, kick_work); |
923 | cdev = priv->cdev; | |
1da177e4 | 924 | sch = to_subchannel(cdev->dev.parent); |
82b7ac05 | 925 | css_update_ssd_info(sch); |
47af5518 CH |
926 | /* |
927 | * io_subchannel_register() will also be called after device | |
928 | * recognition has been done for a boxed device (which will already | |
929 | * be registered). We need to reprobe since we may now have sense id | |
930 | * information. | |
931 | */ | |
b0744bd2 | 932 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
47af5518 CH |
933 | if (!cdev->drv) { |
934 | ret = device_reprobe(&cdev->dev); | |
935 | if (ret) | |
936 | /* We can't do much here. */ | |
139b83dd | 937 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
938 | " %d for 0.%x.%04x\n", ret, |
939 | cdev->private->dev_id.ssid, | |
940 | cdev->private->dev_id.devno); | |
47af5518 | 941 | } |
1da177e4 LT |
942 | goto out; |
943 | } | |
fa1a8c23 CH |
944 | /* |
945 | * Now we know this subchannel will stay, we can throw | |
946 | * our delayed uevent. | |
947 | */ | |
948 | sch->dev.uevent_suppress = 0; | |
949 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
950 | /* make it known to the system */ |
951 | ret = ccw_device_register(cdev); | |
952 | if (ret) { | |
e556bbbd CH |
953 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
954 | cdev->private->dev_id.ssid, | |
955 | cdev->private->dev_id.devno, ret); | |
1da177e4 | 956 | put_device(&cdev->dev); |
2ec22984 | 957 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 958 | sch_set_cdev(sch, NULL); |
2ec22984 | 959 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
960 | kfree (cdev->private); |
961 | kfree (cdev); | |
962 | put_device(&sch->dev); | |
963 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
964 | wake_up(&ccw_device_init_wq); | |
965 | return; | |
966 | } | |
1da177e4 LT |
967 | put_device(&cdev->dev); |
968 | out: | |
969 | cdev->private->flags.recog_done = 1; | |
970 | put_device(&sch->dev); | |
971 | wake_up(&cdev->private->wait_q); | |
972 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
973 | wake_up(&ccw_device_init_wq); | |
974 | } | |
975 | ||
3f4cf6e7 | 976 | static void ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 977 | { |
c1637532 MS |
978 | struct ccw_device_private *priv; |
979 | struct ccw_device *cdev; | |
1da177e4 LT |
980 | struct subchannel *sch; |
981 | ||
c1637532 MS |
982 | priv = container_of(work, struct ccw_device_private, kick_work); |
983 | cdev = priv->cdev; | |
1da177e4 | 984 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 985 | css_sch_device_unregister(sch); |
1da177e4 LT |
986 | /* Reset intparm to zeroes. */ |
987 | sch->schib.pmcw.intparm = 0; | |
988 | cio_modify(sch); | |
989 | put_device(&cdev->dev); | |
990 | put_device(&sch->dev); | |
991 | } | |
992 | ||
993 | /* | |
994 | * subchannel recognition done. Called from the state machine. | |
995 | */ | |
996 | void | |
997 | io_subchannel_recog_done(struct ccw_device *cdev) | |
998 | { | |
999 | struct subchannel *sch; | |
1000 | ||
1001 | if (css_init_done == 0) { | |
1002 | cdev->private->flags.recog_done = 1; | |
1003 | return; | |
1004 | } | |
1005 | switch (cdev->private->state) { | |
1006 | case DEV_STATE_NOT_OPER: | |
1007 | cdev->private->flags.recog_done = 1; | |
1008 | /* Remove device found not operational. */ | |
1009 | if (!get_device(&cdev->dev)) | |
1010 | break; | |
1011 | sch = to_subchannel(cdev->dev.parent); | |
1012 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1013 | ccw_device_call_sch_unregister); |
1da177e4 LT |
1014 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1015 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1016 | wake_up(&ccw_device_init_wq); | |
1017 | break; | |
1018 | case DEV_STATE_BOXED: | |
1019 | /* Device did not respond in time. */ | |
1020 | case DEV_STATE_OFFLINE: | |
1021 | /* | |
1022 | * We can't register the device in interrupt context so | |
1023 | * we schedule a work item. | |
1024 | */ | |
1025 | if (!get_device(&cdev->dev)) | |
1026 | break; | |
1027 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1028 | io_subchannel_register); |
1da177e4 LT |
1029 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1030 | break; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | static int | |
1035 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
1036 | { | |
1037 | int rc; | |
1038 | struct ccw_device_private *priv; | |
1039 | ||
db6a6423 | 1040 | sch_set_cdev(sch, cdev); |
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) { | |
139b83dd | 1089 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel " |
d7b5a4c9 CH |
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 | ||
0ae7a7b2 CH |
1125 | static void io_subchannel_init_fields(struct subchannel *sch) |
1126 | { | |
1127 | if (cio_is_console(sch->schid)) | |
1128 | sch->opm = 0xff; | |
1129 | else | |
1130 | sch->opm = chp_get_sch_opm(sch); | |
1131 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
1132 | sch->isc = cio_is_console(sch->schid) ? 1 : 3; | |
1133 | ||
1134 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1135 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1136 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1137 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1138 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
1139 | /* Initially set up some fields in the pmcw. */ | |
1140 | sch->schib.pmcw.ena = 0; | |
1141 | sch->schib.pmcw.csense = 1; /* concurrent sense */ | |
1142 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1143 | sch->schib.pmcw.mp = 1; /* multipath mode */ | |
1144 | /* clean up possible residual cmf stuff */ | |
1145 | sch->schib.pmcw.mme = 0; | |
1146 | sch->schib.pmcw.mbfc = 0; | |
1147 | sch->schib.pmcw.mbi = 0; | |
1148 | sch->schib.mba = 0; | |
1149 | } | |
1150 | ||
1151 | static int io_subchannel_probe(struct subchannel *sch) | |
1da177e4 | 1152 | { |
1da177e4 LT |
1153 | struct ccw_device *cdev; |
1154 | int rc; | |
1155 | unsigned long flags; | |
d7b5a4c9 | 1156 | struct ccw_dev_id dev_id; |
1da177e4 | 1157 | |
db6a6423 CH |
1158 | cdev = sch_get_cdev(sch); |
1159 | if (cdev) { | |
1da177e4 LT |
1160 | /* |
1161 | * This subchannel already has an associated ccw_device. | |
1162 | * Register it and exit. This happens for all early | |
1163 | * device, e.g. the console. | |
1164 | */ | |
e1031786 | 1165 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1166 | device_initialize(&cdev->dev); |
1167 | ccw_device_register(cdev); | |
1da177e4 LT |
1168 | /* |
1169 | * Check if the device is already online. If it is | |
1170 | * the reference count needs to be corrected | |
1171 | * (see ccw_device_online and css_init_done for the | |
1172 | * ugly details). | |
1173 | */ | |
1174 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1175 | cdev->private->state != DEV_STATE_OFFLINE && | |
1176 | cdev->private->state != DEV_STATE_BOXED) | |
1177 | get_device(&cdev->dev); | |
1178 | return 0; | |
1179 | } | |
0ae7a7b2 | 1180 | io_subchannel_init_fields(sch); |
d7b5a4c9 CH |
1181 | /* |
1182 | * First check if a fitting device may be found amongst the | |
1183 | * disconnected devices or in the orphanage. | |
1184 | */ | |
1185 | dev_id.devno = sch->schib.pmcw.dev; | |
1186 | dev_id.ssid = sch->schid.ssid; | |
cd6b4f27 CH |
1187 | /* Allocate I/O subchannel private data. */ |
1188 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1189 | GFP_KERNEL | GFP_DMA); | |
1190 | if (!sch->private) | |
1191 | return -ENOMEM; | |
d7b5a4c9 CH |
1192 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); |
1193 | if (!cdev) | |
1194 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1195 | &dev_id); | |
1196 | if (cdev) { | |
1197 | /* | |
1198 | * Schedule moving the device until when we have a registered | |
1199 | * subchannel to move to and succeed the probe. We can | |
1200 | * unregister later again, when the probe is through. | |
1201 | */ | |
1202 | cdev->private->sch = sch; | |
1203 | PREPARE_WORK(&cdev->private->kick_work, | |
1204 | ccw_device_move_to_sch); | |
1205 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1206 | return 0; | |
1207 | } | |
7674da77 | 1208 | cdev = io_subchannel_create_ccwdev(sch); |
cd6b4f27 CH |
1209 | if (IS_ERR(cdev)) { |
1210 | kfree(sch->private); | |
7674da77 | 1211 | return PTR_ERR(cdev); |
cd6b4f27 | 1212 | } |
8bbace7e | 1213 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1214 | if (rc) { |
2ec22984 | 1215 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 1216 | sch_set_cdev(sch, NULL); |
2ec22984 | 1217 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
1218 | if (cdev->dev.release) |
1219 | cdev->dev.release(&cdev->dev); | |
cd6b4f27 | 1220 | kfree(sch->private); |
1da177e4 LT |
1221 | } |
1222 | ||
1223 | return rc; | |
1224 | } | |
1225 | ||
1da177e4 | 1226 | static int |
8bbace7e | 1227 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1228 | { |
1229 | struct ccw_device *cdev; | |
1230 | unsigned long flags; | |
1231 | ||
db6a6423 CH |
1232 | cdev = sch_get_cdev(sch); |
1233 | if (!cdev) | |
1da177e4 | 1234 | return 0; |
1da177e4 LT |
1235 | /* Set ccw device to not operational and drop reference. */ |
1236 | spin_lock_irqsave(cdev->ccwlock, flags); | |
db6a6423 | 1237 | sch_set_cdev(sch, NULL); |
1da177e4 LT |
1238 | cdev->private->state = DEV_STATE_NOT_OPER; |
1239 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c CH |
1240 | ccw_device_unregister(cdev); |
1241 | put_device(&cdev->dev); | |
cd6b4f27 | 1242 | kfree(sch->private); |
1da177e4 LT |
1243 | return 0; |
1244 | } | |
1245 | ||
602b20f2 | 1246 | static int io_subchannel_notify(struct subchannel *sch, int event) |
1da177e4 LT |
1247 | { |
1248 | struct ccw_device *cdev; | |
1249 | ||
db6a6423 | 1250 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1251 | if (!cdev) |
1252 | return 0; | |
1253 | if (!cdev->drv) | |
1254 | return 0; | |
1255 | if (!cdev->online) | |
1256 | return 0; | |
1257 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; | |
1258 | } | |
1259 | ||
602b20f2 | 1260 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1261 | { |
1262 | struct ccw_device *cdev; | |
1263 | ||
db6a6423 | 1264 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1265 | if (cdev) |
1266 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1267 | } | |
1268 | ||
602b20f2 | 1269 | static void io_subchannel_ioterm(struct subchannel *sch) |
1da177e4 LT |
1270 | { |
1271 | struct ccw_device *cdev; | |
1272 | ||
db6a6423 | 1273 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1274 | if (!cdev) |
1275 | return; | |
d23861ff CH |
1276 | /* Internal I/O will be retried by the interrupt handler. */ |
1277 | if (cdev->private->flags.intretry) | |
1278 | return; | |
1da177e4 LT |
1279 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
1280 | if (cdev->handler) | |
1281 | cdev->handler(cdev, cdev->private->intparm, | |
1282 | ERR_PTR(-EIO)); | |
1283 | } | |
1284 | ||
1285 | static void | |
8bbace7e | 1286 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1287 | { |
1da177e4 LT |
1288 | struct ccw_device *cdev; |
1289 | int ret; | |
1290 | ||
db6a6423 | 1291 | cdev = sch_get_cdev(sch); |
1da177e4 | 1292 | |
a8237fc4 | 1293 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1294 | return; |
1295 | if (!sch->schib.pmcw.ena) | |
1296 | /* Nothing to do. */ | |
1297 | return; | |
1298 | ret = cio_disable_subchannel(sch); | |
1299 | if (ret != -EBUSY) | |
1300 | /* Subchannel is disabled, we're done. */ | |
1301 | return; | |
1302 | cdev->private->state = DEV_STATE_QUIESCE; | |
1303 | if (cdev->handler) | |
1304 | cdev->handler(cdev, cdev->private->intparm, | |
1305 | ERR_PTR(-EIO)); | |
1306 | ret = ccw_device_cancel_halt_clear(cdev); | |
1307 | if (ret == -EBUSY) { | |
1308 | ccw_device_set_timeout(cdev, HZ/10); | |
1309 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1310 | } | |
1311 | cio_disable_subchannel(sch); | |
1312 | } | |
1313 | ||
1314 | #ifdef CONFIG_CCW_CONSOLE | |
1315 | static struct ccw_device console_cdev; | |
1316 | static struct ccw_device_private console_private; | |
1317 | static int console_cdev_in_use; | |
1318 | ||
2ec22984 CH |
1319 | static DEFINE_SPINLOCK(ccw_console_lock); |
1320 | ||
1321 | spinlock_t * cio_get_console_lock(void) | |
1322 | { | |
1323 | return &ccw_console_lock; | |
1324 | } | |
1325 | ||
0ae7a7b2 CH |
1326 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1327 | struct subchannel *sch) | |
1da177e4 LT |
1328 | { |
1329 | int rc; | |
1330 | ||
cd6b4f27 CH |
1331 | /* Attach subchannel private data. */ |
1332 | sch->private = cio_get_console_priv(); | |
1333 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 CH |
1334 | io_subchannel_init_fields(sch); |
1335 | sch->driver = &io_subchannel_driver; | |
1da177e4 | 1336 | /* Initialize the ccw_device structure. */ |
292888c8 | 1337 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1338 | rc = io_subchannel_recog(cdev, sch); |
1339 | if (rc) | |
1340 | return rc; | |
1341 | ||
1342 | /* Now wait for the async. recognition to come to an end. */ | |
1343 | spin_lock_irq(cdev->ccwlock); | |
1344 | while (!dev_fsm_final_state(cdev)) | |
1345 | wait_cons_dev(); | |
1346 | rc = -EIO; | |
1347 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1348 | goto out_unlock; | |
1349 | ccw_device_online(cdev); | |
1350 | while (!dev_fsm_final_state(cdev)) | |
1351 | wait_cons_dev(); | |
1352 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1353 | goto out_unlock; | |
1354 | rc = 0; | |
1355 | out_unlock: | |
1356 | spin_unlock_irq(cdev->ccwlock); | |
1357 | return 0; | |
1358 | } | |
1359 | ||
1360 | struct ccw_device * | |
1361 | ccw_device_probe_console(void) | |
1362 | { | |
1363 | struct subchannel *sch; | |
1364 | int ret; | |
1365 | ||
1366 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1367 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1368 | sch = cio_probe_console(); |
1369 | if (IS_ERR(sch)) { | |
1370 | console_cdev_in_use = 0; | |
1371 | return (void *) sch; | |
1372 | } | |
1373 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1374 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1375 | console_cdev.private = &console_private; | |
c1637532 | 1376 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1377 | ret = ccw_device_console_enable(&console_cdev, sch); |
1378 | if (ret) { | |
1379 | cio_release_console(); | |
1380 | console_cdev_in_use = 0; | |
1381 | return ERR_PTR(ret); | |
1382 | } | |
1383 | console_cdev.online = 1; | |
1384 | return &console_cdev; | |
1385 | } | |
1386 | #endif | |
1387 | ||
1388 | /* | |
1389 | * get ccw_device matching the busid, but only if owned by cdrv | |
1390 | */ | |
b0744bd2 CH |
1391 | static int |
1392 | __ccwdev_check_busid(struct device *dev, void *id) | |
1393 | { | |
1394 | char *bus_id; | |
1395 | ||
12975aef | 1396 | bus_id = id; |
b0744bd2 CH |
1397 | |
1398 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); | |
1399 | } | |
1400 | ||
1401 | ||
b2ffd8e9 CH |
1402 | /** |
1403 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1404 | * @cdrv: driver the device is owned by | |
1405 | * @bus_id: bus id of the device to be searched | |
1406 | * | |
1407 | * This function searches all devices owned by @cdrv for a device with a bus | |
1408 | * id matching @bus_id. | |
1409 | * Returns: | |
1410 | * If a match is found, its reference count of the found device is increased | |
1411 | * and it is returned; else %NULL is returned. | |
1412 | */ | |
1413 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1414 | const char *bus_id) | |
1da177e4 | 1415 | { |
b0744bd2 | 1416 | struct device *dev; |
1da177e4 LT |
1417 | struct device_driver *drv; |
1418 | ||
1419 | drv = get_driver(&cdrv->driver); | |
1420 | if (!drv) | |
b0744bd2 | 1421 | return NULL; |
1da177e4 | 1422 | |
b0744bd2 CH |
1423 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1424 | __ccwdev_check_busid); | |
1da177e4 LT |
1425 | put_driver(drv); |
1426 | ||
d2c993d8 | 1427 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1428 | } |
1429 | ||
1430 | /************************** device driver handling ************************/ | |
1431 | ||
1432 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1433 | * and release methods are initially very similar to the device_driver | |
1434 | * implementations, with the difference that they have ccw_device | |
1435 | * arguments. | |
1436 | * | |
1437 | * A ccw driver also contains the information that is needed for | |
1438 | * device matching. | |
1439 | */ | |
1440 | static int | |
1441 | ccw_device_probe (struct device *dev) | |
1442 | { | |
1443 | struct ccw_device *cdev = to_ccwdev(dev); | |
1444 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1445 | int ret; | |
1446 | ||
1447 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1448 | ||
1449 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1450 | ||
1451 | if (ret) { | |
d2c993d8 | 1452 | cdev->drv = NULL; |
1da177e4 LT |
1453 | return ret; |
1454 | } | |
1455 | ||
1456 | return 0; | |
1457 | } | |
1458 | ||
1459 | static int | |
1460 | ccw_device_remove (struct device *dev) | |
1461 | { | |
1462 | struct ccw_device *cdev = to_ccwdev(dev); | |
1463 | struct ccw_driver *cdrv = cdev->drv; | |
1464 | int ret; | |
1465 | ||
1da177e4 LT |
1466 | if (cdrv->remove) |
1467 | cdrv->remove(cdev); | |
1468 | if (cdev->online) { | |
1469 | cdev->online = 0; | |
1470 | spin_lock_irq(cdev->ccwlock); | |
1471 | ret = ccw_device_offline(cdev); | |
1472 | spin_unlock_irq(cdev->ccwlock); | |
1473 | if (ret == 0) | |
1474 | wait_event(cdev->private->wait_q, | |
1475 | dev_fsm_final_state(cdev)); | |
1476 | else | |
139b83dd | 1477 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1478 | "device 0.%x.%04x\n", |
1479 | ret, cdev->private->dev_id.ssid, | |
1480 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1481 | } |
1482 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1483 | cdev->drv = NULL; |
1da177e4 LT |
1484 | return 0; |
1485 | } | |
1486 | ||
958974fb CH |
1487 | static void ccw_device_shutdown(struct device *dev) |
1488 | { | |
1489 | struct ccw_device *cdev; | |
1490 | ||
1491 | cdev = to_ccwdev(dev); | |
1492 | if (cdev->drv && cdev->drv->shutdown) | |
1493 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1494 | disable_cmf(cdev); |
958974fb CH |
1495 | } |
1496 | ||
8bbace7e CH |
1497 | struct bus_type ccw_bus_type = { |
1498 | .name = "ccw", | |
1499 | .match = ccw_bus_match, | |
1500 | .uevent = ccw_uevent, | |
1501 | .probe = ccw_device_probe, | |
1502 | .remove = ccw_device_remove, | |
958974fb | 1503 | .shutdown = ccw_device_shutdown, |
8bbace7e CH |
1504 | }; |
1505 | ||
b2ffd8e9 CH |
1506 | /** |
1507 | * ccw_driver_register() - register a ccw driver | |
1508 | * @cdriver: driver to be registered | |
1509 | * | |
1510 | * This function is mainly a wrapper around driver_register(). | |
1511 | * Returns: | |
1512 | * %0 on success and a negative error value on failure. | |
1513 | */ | |
1514 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1515 | { |
1516 | struct device_driver *drv = &cdriver->driver; | |
1517 | ||
1518 | drv->bus = &ccw_bus_type; | |
1519 | drv->name = cdriver->name; | |
4beee646 | 1520 | drv->owner = cdriver->owner; |
1da177e4 LT |
1521 | |
1522 | return driver_register(drv); | |
1523 | } | |
1524 | ||
b2ffd8e9 CH |
1525 | /** |
1526 | * ccw_driver_unregister() - deregister a ccw driver | |
1527 | * @cdriver: driver to be deregistered | |
1528 | * | |
1529 | * This function is mainly a wrapper around driver_unregister(). | |
1530 | */ | |
1531 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1532 | { |
1533 | driver_unregister(&cdriver->driver); | |
1534 | } | |
1535 | ||
a8237fc4 CH |
1536 | /* Helper func for qdio. */ |
1537 | struct subchannel_id | |
1538 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1539 | { | |
1540 | struct subchannel *sch; | |
1541 | ||
1542 | sch = to_subchannel(cdev->dev.parent); | |
1543 | return sch->schid; | |
1544 | } | |
1545 | ||
90ab1336 PO |
1546 | static int recovery_check(struct device *dev, void *data) |
1547 | { | |
1548 | struct ccw_device *cdev = to_ccwdev(dev); | |
1549 | int *redo = data; | |
1550 | ||
1551 | spin_lock_irq(cdev->ccwlock); | |
1552 | switch (cdev->private->state) { | |
1553 | case DEV_STATE_DISCONNECTED: | |
139b83dd | 1554 | CIO_MSG_EVENT(4, "recovery: trigger 0.%x.%04x\n", |
90ab1336 PO |
1555 | cdev->private->dev_id.ssid, |
1556 | cdev->private->dev_id.devno); | |
1557 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1558 | *redo = 1; | |
1559 | break; | |
1560 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1561 | *redo = 1; | |
1562 | break; | |
1563 | } | |
1564 | spin_unlock_irq(cdev->ccwlock); | |
1565 | ||
1566 | return 0; | |
1567 | } | |
1568 | ||
4c629727 | 1569 | static void recovery_work_func(struct work_struct *unused) |
90ab1336 PO |
1570 | { |
1571 | int redo = 0; | |
1572 | ||
1573 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1574 | if (redo) { | |
1575 | spin_lock_irq(&recovery_lock); | |
1576 | if (!timer_pending(&recovery_timer)) { | |
1577 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1578 | recovery_phase++; | |
1579 | mod_timer(&recovery_timer, jiffies + | |
1580 | recovery_delay[recovery_phase] * HZ); | |
1581 | } | |
1582 | spin_unlock_irq(&recovery_lock); | |
1583 | } else | |
139b83dd | 1584 | CIO_MSG_EVENT(4, "recovery: end\n"); |
90ab1336 PO |
1585 | } |
1586 | ||
4c629727 CH |
1587 | static DECLARE_WORK(recovery_work, recovery_work_func); |
1588 | ||
1589 | static void recovery_func(unsigned long data) | |
1590 | { | |
1591 | /* | |
1592 | * We can't do our recovery in softirq context and it's not | |
1593 | * performance critical, so we schedule it. | |
1594 | */ | |
1595 | schedule_work(&recovery_work); | |
1596 | } | |
1597 | ||
90ab1336 PO |
1598 | void ccw_device_schedule_recovery(void) |
1599 | { | |
1600 | unsigned long flags; | |
1601 | ||
139b83dd | 1602 | CIO_MSG_EVENT(4, "recovery: schedule\n"); |
90ab1336 PO |
1603 | spin_lock_irqsave(&recovery_lock, flags); |
1604 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1605 | recovery_phase = 0; | |
1606 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1607 | } | |
1608 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1609 | } | |
1610 | ||
1da177e4 LT |
1611 | MODULE_LICENSE("GPL"); |
1612 | EXPORT_SYMBOL(ccw_device_set_online); | |
1613 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1614 | EXPORT_SYMBOL(ccw_driver_register); | |
1615 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1616 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1617 | EXPORT_SYMBOL(ccw_bus_type); | |
1618 | EXPORT_SYMBOL(ccw_device_work); | |
1619 | EXPORT_SYMBOL(ccw_device_notify_work); | |
a8237fc4 | 1620 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |