Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
4ce3b30c | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
9 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
10 | */ | |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/workqueue.h> | |
20 | ||
21 | #include <asm/ccwdev.h> | |
22 | #include <asm/cio.h> | |
4e57b681 | 23 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 24 | #include <asm/cmb.h> |
1da177e4 LT |
25 | |
26 | #include "cio.h" | |
d7b5a4c9 | 27 | #include "cio_debug.h" |
1da177e4 LT |
28 | #include "css.h" |
29 | #include "device.h" | |
30 | #include "ioasm.h" | |
31 | ||
32 | /******************* bus type handling ***********************/ | |
33 | ||
34 | /* The Linux driver model distinguishes between a bus type and | |
35 | * the bus itself. Of course we only have one channel | |
36 | * subsystem driver and one channel system per machine, but | |
37 | * we still use the abstraction. T.R. says it's a good idea. */ | |
38 | static int | |
39 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
40 | { | |
41 | struct ccw_device *cdev = to_ccwdev(dev); | |
42 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
43 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
44 | ||
45 | if (!ids) | |
46 | return 0; | |
47 | ||
48 | found = ccw_device_id_match(ids, &cdev->id); | |
49 | if (!found) | |
50 | return 0; | |
51 | ||
52 | cdev->id.driver_info = found->driver_info; | |
53 | ||
54 | return 1; | |
55 | } | |
56 | ||
db0c2d59 PO |
57 | /* Store modalias string delimited by prefix/suffix string into buffer with |
58 | * specified size. Return length of resulting string (excluding trailing '\0') | |
59 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 60 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 61 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 62 | { |
db0c2d59 | 63 | int len; |
1da177e4 | 64 | |
cfbe9bb2 | 65 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
66 | if (len > size) |
67 | return len; | |
68 | buf += len; | |
69 | size -= len; | |
1da177e4 | 70 | |
db0c2d59 PO |
71 | if (id->dev_type != 0) |
72 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
73 | id->dev_model, suffix); | |
74 | else | |
75 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 76 | |
db0c2d59 PO |
77 | return len; |
78 | } | |
79 | ||
80 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
81 | * non-zero otherwise. */ | |
7eff2e7a | 82 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
83 | { |
84 | struct ccw_device *cdev = to_ccwdev(dev); | |
85 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
86 | int ret; |
87 | char modalias_buf[30]; | |
1da177e4 | 88 | |
db0c2d59 | 89 | /* CU_TYPE= */ |
7eff2e7a | 90 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
91 | if (ret) |
92 | return ret; | |
db0c2d59 PO |
93 | |
94 | /* CU_MODEL= */ | |
7eff2e7a | 95 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
96 | if (ret) |
97 | return ret; | |
1da177e4 LT |
98 | |
99 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 100 | /* DEV_TYPE= */ |
7eff2e7a | 101 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
102 | if (ret) |
103 | return ret; | |
1da177e4 | 104 | |
db0c2d59 | 105 | /* DEV_MODEL= */ |
7eff2e7a | 106 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
107 | if (ret) |
108 | return ret; | |
db0c2d59 PO |
109 | |
110 | /* MODALIAS= */ | |
cfbe9bb2 | 111 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
112 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
113 | return ret; | |
1da177e4 LT |
114 | } |
115 | ||
8bbace7e | 116 | struct bus_type ccw_bus_type; |
1da177e4 | 117 | |
8bbace7e CH |
118 | static int io_subchannel_probe (struct subchannel *); |
119 | static int io_subchannel_remove (struct subchannel *); | |
1da177e4 LT |
120 | static int io_subchannel_notify(struct device *, int); |
121 | static void io_subchannel_verify(struct device *); | |
122 | static void io_subchannel_ioterm(struct device *); | |
8bbace7e | 123 | static void io_subchannel_shutdown(struct subchannel *); |
1da177e4 | 124 | |
f7e5d67c | 125 | static struct css_driver io_subchannel_driver = { |
1da177e4 LT |
126 | .subchannel_type = SUBCHANNEL_TYPE_IO, |
127 | .drv = { | |
128 | .name = "io_subchannel", | |
129 | .bus = &css_bus_type, | |
1da177e4 LT |
130 | }, |
131 | .irq = io_subchannel_irq, | |
132 | .notify = io_subchannel_notify, | |
133 | .verify = io_subchannel_verify, | |
134 | .termination = io_subchannel_ioterm, | |
8bbace7e CH |
135 | .probe = io_subchannel_probe, |
136 | .remove = io_subchannel_remove, | |
137 | .shutdown = io_subchannel_shutdown, | |
1da177e4 LT |
138 | }; |
139 | ||
140 | struct workqueue_struct *ccw_device_work; | |
141 | struct workqueue_struct *ccw_device_notify_work; | |
40154b82 PO |
142 | wait_queue_head_t ccw_device_init_wq; |
143 | atomic_t ccw_device_init_count; | |
1da177e4 LT |
144 | |
145 | static int __init | |
146 | init_ccw_bus_type (void) | |
147 | { | |
148 | int ret; | |
149 | ||
150 | init_waitqueue_head(&ccw_device_init_wq); | |
151 | atomic_set(&ccw_device_init_count, 0); | |
152 | ||
153 | ccw_device_work = create_singlethread_workqueue("cio"); | |
154 | if (!ccw_device_work) | |
155 | return -ENOMEM; /* FIXME: better errno ? */ | |
156 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); | |
157 | if (!ccw_device_notify_work) { | |
158 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
159 | goto out_err; | |
160 | } | |
161 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); | |
162 | if (!slow_path_wq) { | |
163 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
164 | goto out_err; | |
165 | } | |
166 | if ((ret = bus_register (&ccw_bus_type))) | |
167 | goto out_err; | |
168 | ||
169 | if ((ret = driver_register(&io_subchannel_driver.drv))) | |
170 | goto out_err; | |
171 | ||
172 | wait_event(ccw_device_init_wq, | |
173 | atomic_read(&ccw_device_init_count) == 0); | |
174 | flush_workqueue(ccw_device_work); | |
175 | return 0; | |
176 | out_err: | |
177 | if (ccw_device_work) | |
178 | destroy_workqueue(ccw_device_work); | |
179 | if (ccw_device_notify_work) | |
180 | destroy_workqueue(ccw_device_notify_work); | |
181 | if (slow_path_wq) | |
182 | destroy_workqueue(slow_path_wq); | |
183 | return ret; | |
184 | } | |
185 | ||
186 | static void __exit | |
187 | cleanup_ccw_bus_type (void) | |
188 | { | |
189 | driver_unregister(&io_subchannel_driver.drv); | |
190 | bus_unregister(&ccw_bus_type); | |
191 | destroy_workqueue(ccw_device_notify_work); | |
192 | destroy_workqueue(ccw_device_work); | |
193 | } | |
194 | ||
195 | subsys_initcall(init_ccw_bus_type); | |
196 | module_exit(cleanup_ccw_bus_type); | |
197 | ||
198 | /************************ device handling **************************/ | |
199 | ||
200 | /* | |
201 | * A ccw_device has some interfaces in sysfs in addition to the | |
202 | * standard ones. | |
203 | * The following entries are designed to export the information which | |
204 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
205 | * are obvious, so they don't have an entry :) | |
206 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
207 | */ | |
208 | static ssize_t | |
3fd3c0a5 | 209 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
210 | { |
211 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 212 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
213 | ssize_t ret = 0; |
214 | int chp; | |
7ad6a249 PO |
215 | int mask; |
216 | ||
217 | for (chp = 0; chp < 8; chp++) { | |
218 | mask = 0x80 >> chp; | |
219 | if (ssd->path_mask & mask) | |
220 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
221 | else | |
222 | ret += sprintf(buf + ret, "00 "); | |
223 | } | |
1da177e4 LT |
224 | ret += sprintf (buf+ret, "\n"); |
225 | return min((ssize_t)PAGE_SIZE, ret); | |
226 | } | |
227 | ||
228 | static ssize_t | |
3fd3c0a5 | 229 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
230 | { |
231 | struct subchannel *sch = to_subchannel(dev); | |
232 | struct pmcw *pmcw = &sch->schib.pmcw; | |
233 | ||
234 | return sprintf (buf, "%02x %02x %02x\n", | |
235 | pmcw->pim, pmcw->pam, pmcw->pom); | |
236 | } | |
237 | ||
238 | static ssize_t | |
3fd3c0a5 | 239 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
240 | { |
241 | struct ccw_device *cdev = to_ccwdev(dev); | |
242 | struct ccw_device_id *id = &(cdev->id); | |
243 | ||
244 | if (id->dev_type != 0) | |
245 | return sprintf(buf, "%04x/%02x\n", | |
246 | id->dev_type, id->dev_model); | |
247 | else | |
248 | return sprintf(buf, "n/a\n"); | |
249 | } | |
250 | ||
251 | static ssize_t | |
3fd3c0a5 | 252 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
253 | { |
254 | struct ccw_device *cdev = to_ccwdev(dev); | |
255 | struct ccw_device_id *id = &(cdev->id); | |
256 | ||
257 | return sprintf(buf, "%04x/%02x\n", | |
258 | id->cu_type, id->cu_model); | |
259 | } | |
260 | ||
f1fc78a8 BB |
261 | static ssize_t |
262 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
263 | { | |
264 | struct ccw_device *cdev = to_ccwdev(dev); | |
265 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 266 | int len; |
f1fc78a8 | 267 | |
086a6c62 | 268 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
269 | |
270 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
271 | } |
272 | ||
1da177e4 | 273 | static ssize_t |
3fd3c0a5 | 274 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
275 | { |
276 | struct ccw_device *cdev = to_ccwdev(dev); | |
277 | ||
278 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
279 | } | |
280 | ||
d7b5a4c9 CH |
281 | int ccw_device_is_orphan(struct ccw_device *cdev) |
282 | { | |
283 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
284 | } | |
285 | ||
ef99516c | 286 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 287 | { |
7674da77 | 288 | if (test_and_clear_bit(1, &cdev->private->registered)) |
ef99516c | 289 | device_del(&cdev->dev); |
7674da77 CH |
290 | } |
291 | ||
59a8a6e2 CH |
292 | static void ccw_device_remove_orphan_cb(struct device *dev) |
293 | { | |
294 | struct ccw_device *cdev = to_ccwdev(dev); | |
295 | ||
296 | ccw_device_unregister(cdev); | |
297 | put_device(&cdev->dev); | |
298 | } | |
299 | ||
300 | static void ccw_device_remove_sch_cb(struct device *dev) | |
301 | { | |
302 | struct subchannel *sch; | |
303 | ||
304 | sch = to_subchannel(dev); | |
305 | css_sch_device_unregister(sch); | |
306 | /* Reset intparm to zeroes. */ | |
307 | sch->schib.pmcw.intparm = 0; | |
308 | cio_modify(sch); | |
309 | put_device(&sch->dev); | |
310 | } | |
311 | ||
1da177e4 LT |
312 | static void |
313 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
314 | { | |
d7b5a4c9 | 315 | unsigned long flags; |
59a8a6e2 CH |
316 | int rc; |
317 | ||
1da177e4 LT |
318 | /* |
319 | * Forced offline in disconnected state means | |
320 | * 'throw away device'. | |
321 | */ | |
d7b5a4c9 | 322 | if (ccw_device_is_orphan(cdev)) { |
59a8a6e2 CH |
323 | /* |
324 | * Deregister ccw device. | |
325 | * Unfortunately, we cannot do this directly from the | |
326 | * attribute method. | |
327 | */ | |
d7b5a4c9 CH |
328 | spin_lock_irqsave(cdev->ccwlock, flags); |
329 | cdev->private->state = DEV_STATE_NOT_OPER; | |
330 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
59a8a6e2 CH |
331 | rc = device_schedule_callback(&cdev->dev, |
332 | ccw_device_remove_orphan_cb); | |
333 | if (rc) | |
e556bbbd CH |
334 | CIO_MSG_EVENT(2, "Couldn't unregister orphan " |
335 | "0.%x.%04x\n", | |
336 | cdev->private->dev_id.ssid, | |
337 | cdev->private->dev_id.devno); | |
59a8a6e2 | 338 | return; |
d7b5a4c9 | 339 | } |
59a8a6e2 CH |
340 | /* Deregister subchannel, which will kill the ccw device. */ |
341 | rc = device_schedule_callback(cdev->dev.parent, | |
342 | ccw_device_remove_sch_cb); | |
343 | if (rc) | |
e556bbbd CH |
344 | CIO_MSG_EVENT(2, "Couldn't unregister disconnected device " |
345 | "0.%x.%04x\n", | |
346 | cdev->private->dev_id.ssid, | |
347 | cdev->private->dev_id.devno); | |
1da177e4 LT |
348 | } |
349 | ||
b2ffd8e9 CH |
350 | /** |
351 | * ccw_device_set_offline() - disable a ccw device for I/O | |
352 | * @cdev: target ccw device | |
353 | * | |
354 | * This function calls the driver's set_offline() function for @cdev, if | |
355 | * given, and then disables @cdev. | |
356 | * Returns: | |
357 | * %0 on success and a negative error value on failure. | |
358 | * Context: | |
359 | * enabled, ccw device lock not held | |
360 | */ | |
361 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 LT |
362 | { |
363 | int ret; | |
364 | ||
365 | if (!cdev) | |
366 | return -ENODEV; | |
367 | if (!cdev->online || !cdev->drv) | |
368 | return -EINVAL; | |
369 | ||
370 | if (cdev->drv->set_offline) { | |
371 | ret = cdev->drv->set_offline(cdev); | |
372 | if (ret != 0) | |
373 | return ret; | |
374 | } | |
375 | cdev->online = 0; | |
376 | spin_lock_irq(cdev->ccwlock); | |
377 | ret = ccw_device_offline(cdev); | |
378 | if (ret == -ENODEV) { | |
379 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
380 | cdev->private->state = DEV_STATE_OFFLINE; | |
381 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
382 | } | |
383 | spin_unlock_irq(cdev->ccwlock); | |
384 | return ret; | |
385 | } | |
386 | spin_unlock_irq(cdev->ccwlock); | |
387 | if (ret == 0) | |
388 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
389 | else { | |
e556bbbd CH |
390 | CIO_MSG_EVENT(2, "ccw_device_offline returned %d, " |
391 | "device 0.%x.%04x\n", | |
392 | ret, cdev->private->dev_id.ssid, | |
393 | cdev->private->dev_id.devno); | |
1da177e4 LT |
394 | cdev->online = 1; |
395 | } | |
396 | return ret; | |
397 | } | |
398 | ||
b2ffd8e9 CH |
399 | /** |
400 | * ccw_device_set_online() - enable a ccw device for I/O | |
401 | * @cdev: target ccw device | |
402 | * | |
403 | * This function first enables @cdev and then calls the driver's set_online() | |
404 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
405 | * disabled again. | |
406 | * Returns: | |
407 | * %0 on success and a negative error value on failure. | |
408 | * Context: | |
409 | * enabled, ccw device lock not held | |
410 | */ | |
411 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
412 | { |
413 | int ret; | |
414 | ||
415 | if (!cdev) | |
416 | return -ENODEV; | |
417 | if (cdev->online || !cdev->drv) | |
418 | return -EINVAL; | |
419 | ||
420 | spin_lock_irq(cdev->ccwlock); | |
421 | ret = ccw_device_online(cdev); | |
422 | spin_unlock_irq(cdev->ccwlock); | |
423 | if (ret == 0) | |
424 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
425 | else { | |
e556bbbd CH |
426 | CIO_MSG_EVENT(2, "ccw_device_online returned %d, " |
427 | "device 0.%x.%04x\n", | |
428 | ret, cdev->private->dev_id.ssid, | |
429 | cdev->private->dev_id.devno); | |
1da177e4 LT |
430 | return ret; |
431 | } | |
432 | if (cdev->private->state != DEV_STATE_ONLINE) | |
433 | return -ENODEV; | |
434 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { | |
435 | cdev->online = 1; | |
436 | return 0; | |
437 | } | |
438 | spin_lock_irq(cdev->ccwlock); | |
439 | ret = ccw_device_offline(cdev); | |
440 | spin_unlock_irq(cdev->ccwlock); | |
441 | if (ret == 0) | |
442 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
e556bbbd CH |
443 | else |
444 | CIO_MSG_EVENT(2, "ccw_device_offline returned %d, " | |
445 | "device 0.%x.%04x\n", | |
446 | ret, cdev->private->dev_id.ssid, | |
447 | cdev->private->dev_id.devno); | |
6cadb78b | 448 | return (ret == 0) ? -ENODEV : ret; |
1da177e4 LT |
449 | } |
450 | ||
f5ba6c86 CH |
451 | static void online_store_handle_offline(struct ccw_device *cdev) |
452 | { | |
453 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
454 | ccw_device_remove_disconnected(cdev); | |
455 | else if (cdev->drv && cdev->drv->set_offline) | |
456 | ccw_device_set_offline(cdev); | |
457 | } | |
458 | ||
459 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
460 | { | |
461 | int ret; | |
462 | ||
463 | /* Do device recognition, if needed. */ | |
464 | if (cdev->id.cu_type == 0) { | |
465 | ret = ccw_device_recognition(cdev); | |
466 | if (ret) { | |
e556bbbd CH |
467 | CIO_MSG_EVENT(0, "Couldn't start recognition " |
468 | "for device 0.%x.%04x (ret=%d)\n", | |
469 | cdev->private->dev_id.ssid, | |
470 | cdev->private->dev_id.devno, ret); | |
f5ba6c86 CH |
471 | return ret; |
472 | } | |
473 | wait_event(cdev->private->wait_q, | |
474 | cdev->private->flags.recog_done); | |
475 | } | |
476 | if (cdev->drv && cdev->drv->set_online) | |
477 | ccw_device_set_online(cdev); | |
478 | return 0; | |
479 | } | |
480 | static void online_store_handle_online(struct ccw_device *cdev, int force) | |
481 | { | |
482 | int ret; | |
483 | ||
484 | ret = online_store_recog_and_online(cdev); | |
485 | if (ret) | |
486 | return; | |
487 | if (force && cdev->private->state == DEV_STATE_BOXED) { | |
488 | ret = ccw_device_stlck(cdev); | |
489 | if (ret) { | |
e556bbbd CH |
490 | dev_warn(&cdev->dev, |
491 | "ccw_device_stlck returned %d!\n", ret); | |
f5ba6c86 CH |
492 | return; |
493 | } | |
494 | if (cdev->id.cu_type == 0) | |
495 | cdev->private->state = DEV_STATE_NOT_OPER; | |
496 | online_store_recog_and_online(cdev); | |
497 | } | |
498 | ||
499 | } | |
500 | ||
501 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
502 | const char *buf, size_t count) | |
1da177e4 LT |
503 | { |
504 | struct ccw_device *cdev = to_ccwdev(dev); | |
f5ba6c86 | 505 | int i, force; |
1da177e4 LT |
506 | char *tmp; |
507 | ||
973bd993 | 508 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 LT |
509 | return -EAGAIN; |
510 | ||
511 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
512 | atomic_set(&cdev->private->onoff, 0); | |
513 | return -EINVAL; | |
514 | } | |
515 | if (!strncmp(buf, "force\n", count)) { | |
516 | force = 1; | |
517 | i = 1; | |
518 | } else { | |
519 | force = 0; | |
520 | i = simple_strtoul(buf, &tmp, 16); | |
521 | } | |
f5ba6c86 CH |
522 | |
523 | switch (i) { | |
524 | case 0: | |
525 | online_store_handle_offline(cdev); | |
526 | break; | |
527 | case 1: | |
528 | online_store_handle_online(cdev, force); | |
529 | break; | |
530 | default: | |
531 | count = -EINVAL; | |
1da177e4 | 532 | } |
1da177e4 LT |
533 | if (cdev->drv) |
534 | module_put(cdev->drv->owner); | |
535 | atomic_set(&cdev->private->onoff, 0); | |
536 | return count; | |
537 | } | |
538 | ||
539 | static ssize_t | |
3fd3c0a5 | 540 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
541 | { |
542 | struct ccw_device *cdev = to_ccwdev(dev); | |
543 | struct subchannel *sch; | |
544 | ||
d7b5a4c9 CH |
545 | if (ccw_device_is_orphan(cdev)) |
546 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
547 | switch (cdev->private->state) { |
548 | case DEV_STATE_BOXED: | |
549 | return sprintf(buf, "boxed\n"); | |
550 | case DEV_STATE_DISCONNECTED: | |
551 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
552 | case DEV_STATE_NOT_OPER: | |
553 | sch = to_subchannel(dev->parent); | |
554 | if (!sch->lpm) | |
555 | return sprintf(buf, "no path\n"); | |
556 | else | |
557 | return sprintf(buf, "no device\n"); | |
558 | default: | |
559 | /* All other states considered fine. */ | |
560 | return sprintf(buf, "good\n"); | |
561 | } | |
562 | } | |
563 | ||
564 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
565 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
566 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
567 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 568 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 LT |
569 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
570 | extern struct device_attribute dev_attr_cmb_enable; | |
571 | static DEVICE_ATTR(availability, 0444, available_show, NULL); | |
572 | ||
573 | static struct attribute * subch_attrs[] = { | |
574 | &dev_attr_chpids.attr, | |
575 | &dev_attr_pimpampom.attr, | |
576 | NULL, | |
577 | }; | |
578 | ||
579 | static struct attribute_group subch_attr_group = { | |
580 | .attrs = subch_attrs, | |
581 | }; | |
582 | ||
529192f3 CH |
583 | struct attribute_group *subch_attr_groups[] = { |
584 | &subch_attr_group, | |
585 | NULL, | |
586 | }; | |
1da177e4 LT |
587 | |
588 | static struct attribute * ccwdev_attrs[] = { | |
589 | &dev_attr_devtype.attr, | |
590 | &dev_attr_cutype.attr, | |
f1fc78a8 | 591 | &dev_attr_modalias.attr, |
1da177e4 LT |
592 | &dev_attr_online.attr, |
593 | &dev_attr_cmb_enable.attr, | |
594 | &dev_attr_availability.attr, | |
595 | NULL, | |
596 | }; | |
597 | ||
598 | static struct attribute_group ccwdev_attr_group = { | |
599 | .attrs = ccwdev_attrs, | |
600 | }; | |
601 | ||
f7e5d67c | 602 | static struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
603 | &ccwdev_attr_group, |
604 | NULL, | |
605 | }; | |
1da177e4 LT |
606 | |
607 | /* this is a simple abstraction for device_register that sets the | |
608 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 609 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
610 | { |
611 | struct device *dev = &cdev->dev; | |
612 | int ret; | |
613 | ||
614 | dev->bus = &ccw_bus_type; | |
615 | ||
616 | if ((ret = device_add(dev))) | |
617 | return ret; | |
618 | ||
619 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
620 | return ret; |
621 | } | |
622 | ||
b0744bd2 | 623 | struct match_data { |
78964268 | 624 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
625 | struct ccw_device * sibling; |
626 | }; | |
627 | ||
628 | static int | |
629 | match_devno(struct device * dev, void * data) | |
630 | { | |
78964268 | 631 | struct match_data * d = data; |
b0744bd2 CH |
632 | struct ccw_device * cdev; |
633 | ||
634 | cdev = to_ccwdev(dev); | |
635 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 636 | !ccw_device_is_orphan(cdev) && |
78964268 | 637 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 638 | (cdev != d->sibling)) |
b0744bd2 | 639 | return 1; |
b0744bd2 CH |
640 | return 0; |
641 | } | |
642 | ||
78964268 CH |
643 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
644 | struct ccw_device *sibling) | |
1da177e4 | 645 | { |
1da177e4 | 646 | struct device *dev; |
292888c8 | 647 | struct match_data data; |
1da177e4 | 648 | |
78964268 | 649 | data.dev_id = *dev_id; |
292888c8 | 650 | data.sibling = sibling; |
e5945b4f | 651 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 652 | |
b0744bd2 | 653 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
654 | } |
655 | ||
d7b5a4c9 CH |
656 | static int match_orphan(struct device *dev, void *data) |
657 | { | |
658 | struct ccw_dev_id *dev_id; | |
659 | struct ccw_device *cdev; | |
660 | ||
661 | dev_id = data; | |
662 | cdev = to_ccwdev(dev); | |
663 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
664 | } | |
665 | ||
666 | static struct ccw_device * | |
667 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
668 | struct ccw_dev_id *dev_id) | |
669 | { | |
670 | struct device *dev; | |
671 | ||
672 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
673 | match_orphan); | |
674 | ||
675 | return dev ? to_ccwdev(dev) : NULL; | |
676 | } | |
677 | ||
1da177e4 | 678 | static void |
c1637532 | 679 | ccw_device_add_changed(struct work_struct *work) |
1da177e4 | 680 | { |
c1637532 | 681 | struct ccw_device_private *priv; |
1da177e4 LT |
682 | struct ccw_device *cdev; |
683 | ||
c1637532 MS |
684 | priv = container_of(work, struct ccw_device_private, kick_work); |
685 | cdev = priv->cdev; | |
1da177e4 LT |
686 | if (device_add(&cdev->dev)) { |
687 | put_device(&cdev->dev); | |
688 | return; | |
689 | } | |
690 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
691 | } |
692 | ||
d7b5a4c9 | 693 | void ccw_device_do_unreg_rereg(struct work_struct *work) |
1da177e4 | 694 | { |
c1637532 | 695 | struct ccw_device_private *priv; |
1da177e4 LT |
696 | struct ccw_device *cdev; |
697 | struct subchannel *sch; | |
1da177e4 | 698 | |
c1637532 MS |
699 | priv = container_of(work, struct ccw_device_private, kick_work); |
700 | cdev = priv->cdev; | |
1da177e4 | 701 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 702 | |
ef99516c | 703 | ccw_device_unregister(cdev); |
1da177e4 | 704 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 705 | ccw_device_add_changed); |
1da177e4 LT |
706 | queue_work(ccw_device_work, &cdev->private->kick_work); |
707 | } | |
708 | ||
709 | static void | |
710 | ccw_device_release(struct device *dev) | |
711 | { | |
712 | struct ccw_device *cdev; | |
713 | ||
714 | cdev = to_ccwdev(dev); | |
715 | kfree(cdev->private); | |
716 | kfree(cdev); | |
717 | } | |
718 | ||
7674da77 CH |
719 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
720 | { | |
721 | struct ccw_device *cdev; | |
722 | ||
723 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
724 | if (cdev) { | |
725 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
726 | GFP_KERNEL | GFP_DMA); | |
727 | if (cdev->private) | |
728 | return cdev; | |
729 | } | |
730 | kfree(cdev); | |
731 | return ERR_PTR(-ENOMEM); | |
732 | } | |
733 | ||
734 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
735 | struct ccw_device *cdev) | |
736 | { | |
737 | cdev->private->cdev = cdev; | |
738 | atomic_set(&cdev->private->onoff, 0); | |
739 | cdev->dev.parent = &sch->dev; | |
740 | cdev->dev.release = ccw_device_release; | |
33583c36 | 741 | INIT_WORK(&cdev->private->kick_work, NULL); |
ef99516c | 742 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
743 | /* Do first half of device_register. */ |
744 | device_initialize(&cdev->dev); | |
745 | if (!get_device(&sch->dev)) { | |
746 | if (cdev->dev.release) | |
747 | cdev->dev.release(&cdev->dev); | |
748 | return -ENODEV; | |
749 | } | |
750 | return 0; | |
751 | } | |
752 | ||
753 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
754 | { | |
755 | struct ccw_device *cdev; | |
756 | int ret; | |
757 | ||
758 | cdev = io_subchannel_allocate_dev(sch); | |
759 | if (!IS_ERR(cdev)) { | |
760 | ret = io_subchannel_initialize_dev(sch, cdev); | |
761 | if (ret) { | |
762 | kfree(cdev); | |
763 | cdev = ERR_PTR(ret); | |
764 | } | |
765 | } | |
766 | return cdev; | |
767 | } | |
768 | ||
d7b5a4c9 CH |
769 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
770 | ||
771 | static void sch_attach_device(struct subchannel *sch, | |
772 | struct ccw_device *cdev) | |
773 | { | |
82b7ac05 | 774 | css_update_ssd_info(sch); |
d7b5a4c9 CH |
775 | spin_lock_irq(sch->lock); |
776 | sch->dev.driver_data = cdev; | |
777 | cdev->private->schid = sch->schid; | |
778 | cdev->ccwlock = sch->lock; | |
779 | device_trigger_reprobe(sch); | |
780 | spin_unlock_irq(sch->lock); | |
781 | } | |
782 | ||
783 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
784 | struct ccw_device *cdev) | |
785 | { | |
786 | struct subchannel *other_sch; | |
787 | int ret; | |
788 | ||
789 | other_sch = to_subchannel(get_device(cdev->dev.parent)); | |
790 | ret = device_move(&cdev->dev, &sch->dev); | |
791 | if (ret) { | |
792 | CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed " | |
793 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
794 | cdev->private->dev_id.devno, ret); | |
795 | put_device(&other_sch->dev); | |
796 | return; | |
797 | } | |
798 | other_sch->dev.driver_data = NULL; | |
799 | /* No need to keep a subchannel without ccw device around. */ | |
800 | css_sch_device_unregister(other_sch); | |
801 | put_device(&other_sch->dev); | |
802 | sch_attach_device(sch, cdev); | |
803 | } | |
804 | ||
805 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
806 | struct ccw_device *cdev) | |
807 | { | |
808 | int ret; | |
809 | ||
810 | /* Try to move the ccw device to its new subchannel. */ | |
811 | ret = device_move(&cdev->dev, &sch->dev); | |
812 | if (ret) { | |
813 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
814 | "failed (ret=%d)!\n", | |
815 | cdev->private->dev_id.ssid, | |
816 | cdev->private->dev_id.devno, ret); | |
817 | return; | |
818 | } | |
819 | sch_attach_device(sch, cdev); | |
820 | } | |
821 | ||
822 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
823 | { | |
824 | struct ccw_device *cdev; | |
825 | ||
826 | /* Need to allocate a new ccw device. */ | |
827 | cdev = io_subchannel_create_ccwdev(sch); | |
828 | if (IS_ERR(cdev)) { | |
829 | /* OK, we did everything we could... */ | |
830 | css_sch_device_unregister(sch); | |
831 | return; | |
832 | } | |
833 | spin_lock_irq(sch->lock); | |
834 | sch->dev.driver_data = cdev; | |
835 | spin_unlock_irq(sch->lock); | |
836 | /* Start recognition for the new ccw device. */ | |
837 | if (io_subchannel_recog(cdev, sch)) { | |
838 | spin_lock_irq(sch->lock); | |
839 | sch->dev.driver_data = NULL; | |
840 | spin_unlock_irq(sch->lock); | |
841 | if (cdev->dev.release) | |
842 | cdev->dev.release(&cdev->dev); | |
843 | css_sch_device_unregister(sch); | |
844 | } | |
845 | } | |
846 | ||
847 | ||
848 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
849 | { | |
850 | struct ccw_device_private *priv; | |
851 | struct ccw_device *cdev; | |
852 | struct ccw_device *replacing_cdev; | |
853 | struct subchannel *sch; | |
854 | int ret; | |
855 | struct channel_subsystem *css; | |
856 | struct ccw_dev_id dev_id; | |
857 | ||
858 | priv = container_of(work, struct ccw_device_private, kick_work); | |
859 | cdev = priv->cdev; | |
860 | sch = to_subchannel(cdev->dev.parent); | |
861 | css = to_css(sch->dev.parent); | |
862 | dev_id.devno = sch->schib.pmcw.dev; | |
863 | dev_id.ssid = sch->schid.ssid; | |
864 | ||
865 | /* | |
866 | * Move the orphaned ccw device to the orphanage so the replacing | |
867 | * ccw device can take its place on the subchannel. | |
868 | */ | |
869 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev); | |
870 | if (ret) { | |
871 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
872 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
873 | cdev->private->dev_id.devno, ret); | |
874 | return; | |
875 | } | |
876 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
877 | /* | |
878 | * Search for the replacing ccw device | |
879 | * - among the disconnected devices | |
880 | * - in the orphanage | |
881 | */ | |
882 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
883 | if (replacing_cdev) { | |
884 | sch_attach_disconnected_device(sch, replacing_cdev); | |
885 | return; | |
886 | } | |
887 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
888 | if (replacing_cdev) { | |
889 | sch_attach_orphaned_device(sch, replacing_cdev); | |
890 | return; | |
891 | } | |
892 | sch_create_and_recog_new_device(sch); | |
893 | } | |
894 | ||
1da177e4 LT |
895 | /* |
896 | * Register recognized device. | |
897 | */ | |
898 | static void | |
c1637532 | 899 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 900 | { |
c1637532 | 901 | struct ccw_device_private *priv; |
1da177e4 LT |
902 | struct ccw_device *cdev; |
903 | struct subchannel *sch; | |
904 | int ret; | |
905 | unsigned long flags; | |
906 | ||
c1637532 MS |
907 | priv = container_of(work, struct ccw_device_private, kick_work); |
908 | cdev = priv->cdev; | |
1da177e4 | 909 | sch = to_subchannel(cdev->dev.parent); |
82b7ac05 | 910 | css_update_ssd_info(sch); |
47af5518 CH |
911 | /* |
912 | * io_subchannel_register() will also be called after device | |
913 | * recognition has been done for a boxed device (which will already | |
914 | * be registered). We need to reprobe since we may now have sense id | |
915 | * information. | |
916 | */ | |
b0744bd2 | 917 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
47af5518 CH |
918 | if (!cdev->drv) { |
919 | ret = device_reprobe(&cdev->dev); | |
920 | if (ret) | |
921 | /* We can't do much here. */ | |
e556bbbd CH |
922 | CIO_MSG_EVENT(2, "device_reprobe() returned" |
923 | " %d for 0.%x.%04x\n", ret, | |
924 | cdev->private->dev_id.ssid, | |
925 | cdev->private->dev_id.devno); | |
47af5518 | 926 | } |
1da177e4 LT |
927 | goto out; |
928 | } | |
fa1a8c23 CH |
929 | /* |
930 | * Now we know this subchannel will stay, we can throw | |
931 | * our delayed uevent. | |
932 | */ | |
933 | sch->dev.uevent_suppress = 0; | |
934 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
935 | /* make it known to the system */ |
936 | ret = ccw_device_register(cdev); | |
937 | if (ret) { | |
e556bbbd CH |
938 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
939 | cdev->private->dev_id.ssid, | |
940 | cdev->private->dev_id.devno, ret); | |
1da177e4 | 941 | put_device(&cdev->dev); |
2ec22984 | 942 | spin_lock_irqsave(sch->lock, flags); |
1da177e4 | 943 | sch->dev.driver_data = NULL; |
2ec22984 | 944 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
945 | kfree (cdev->private); |
946 | kfree (cdev); | |
947 | put_device(&sch->dev); | |
948 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
949 | wake_up(&ccw_device_init_wq); | |
950 | return; | |
951 | } | |
1da177e4 LT |
952 | put_device(&cdev->dev); |
953 | out: | |
954 | cdev->private->flags.recog_done = 1; | |
955 | put_device(&sch->dev); | |
956 | wake_up(&cdev->private->wait_q); | |
957 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
958 | wake_up(&ccw_device_init_wq); | |
959 | } | |
960 | ||
3f4cf6e7 | 961 | static void ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 962 | { |
c1637532 MS |
963 | struct ccw_device_private *priv; |
964 | struct ccw_device *cdev; | |
1da177e4 LT |
965 | struct subchannel *sch; |
966 | ||
c1637532 MS |
967 | priv = container_of(work, struct ccw_device_private, kick_work); |
968 | cdev = priv->cdev; | |
1da177e4 | 969 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 970 | css_sch_device_unregister(sch); |
1da177e4 LT |
971 | /* Reset intparm to zeroes. */ |
972 | sch->schib.pmcw.intparm = 0; | |
973 | cio_modify(sch); | |
974 | put_device(&cdev->dev); | |
975 | put_device(&sch->dev); | |
976 | } | |
977 | ||
978 | /* | |
979 | * subchannel recognition done. Called from the state machine. | |
980 | */ | |
981 | void | |
982 | io_subchannel_recog_done(struct ccw_device *cdev) | |
983 | { | |
984 | struct subchannel *sch; | |
985 | ||
986 | if (css_init_done == 0) { | |
987 | cdev->private->flags.recog_done = 1; | |
988 | return; | |
989 | } | |
990 | switch (cdev->private->state) { | |
991 | case DEV_STATE_NOT_OPER: | |
992 | cdev->private->flags.recog_done = 1; | |
993 | /* Remove device found not operational. */ | |
994 | if (!get_device(&cdev->dev)) | |
995 | break; | |
996 | sch = to_subchannel(cdev->dev.parent); | |
997 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 998 | ccw_device_call_sch_unregister); |
1da177e4 LT |
999 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1000 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1001 | wake_up(&ccw_device_init_wq); | |
1002 | break; | |
1003 | case DEV_STATE_BOXED: | |
1004 | /* Device did not respond in time. */ | |
1005 | case DEV_STATE_OFFLINE: | |
1006 | /* | |
1007 | * We can't register the device in interrupt context so | |
1008 | * we schedule a work item. | |
1009 | */ | |
1010 | if (!get_device(&cdev->dev)) | |
1011 | break; | |
1012 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1013 | io_subchannel_register); |
1da177e4 LT |
1014 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1015 | break; | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | static int | |
1020 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
1021 | { | |
1022 | int rc; | |
1023 | struct ccw_device_private *priv; | |
1024 | ||
1025 | sch->dev.driver_data = cdev; | |
1026 | sch->driver = &io_subchannel_driver; | |
2ec22984 | 1027 | cdev->ccwlock = sch->lock; |
fb6958a5 | 1028 | |
1da177e4 LT |
1029 | /* Init private data. */ |
1030 | priv = cdev->private; | |
78964268 CH |
1031 | priv->dev_id.devno = sch->schib.pmcw.dev; |
1032 | priv->dev_id.ssid = sch->schid.ssid; | |
1033 | priv->schid = sch->schid; | |
1da177e4 LT |
1034 | priv->state = DEV_STATE_NOT_OPER; |
1035 | INIT_LIST_HEAD(&priv->cmb_list); | |
1036 | init_waitqueue_head(&priv->wait_q); | |
1037 | init_timer(&priv->timer); | |
1038 | ||
1039 | /* Set an initial name for the device. */ | |
fb6958a5 CH |
1040 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", |
1041 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 LT |
1042 | |
1043 | /* Increase counter of devices currently in recognition. */ | |
1044 | atomic_inc(&ccw_device_init_count); | |
1045 | ||
1046 | /* Start async. device sensing. */ | |
2ec22984 | 1047 | spin_lock_irq(sch->lock); |
1da177e4 | 1048 | rc = ccw_device_recognition(cdev); |
2ec22984 | 1049 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
1050 | if (rc) { |
1051 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1052 | wake_up(&ccw_device_init_wq); | |
1053 | } | |
1054 | return rc; | |
1055 | } | |
1056 | ||
d7b5a4c9 CH |
1057 | static void ccw_device_move_to_sch(struct work_struct *work) |
1058 | { | |
1059 | struct ccw_device_private *priv; | |
1060 | int rc; | |
1061 | struct subchannel *sch; | |
1062 | struct ccw_device *cdev; | |
1063 | struct subchannel *former_parent; | |
1064 | ||
1065 | priv = container_of(work, struct ccw_device_private, kick_work); | |
1066 | sch = priv->sch; | |
1067 | cdev = priv->cdev; | |
1068 | former_parent = ccw_device_is_orphan(cdev) ? | |
1069 | NULL : to_subchannel(get_device(cdev->dev.parent)); | |
1070 | mutex_lock(&sch->reg_mutex); | |
1071 | /* Try to move the ccw device to its new subchannel. */ | |
1072 | rc = device_move(&cdev->dev, &sch->dev); | |
1073 | mutex_unlock(&sch->reg_mutex); | |
1074 | if (rc) { | |
1075 | CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel " | |
1076 | "0.%x.%04x failed (ret=%d)!\n", | |
1077 | cdev->private->dev_id.ssid, | |
1078 | cdev->private->dev_id.devno, sch->schid.ssid, | |
1079 | sch->schid.sch_no, rc); | |
1080 | css_sch_device_unregister(sch); | |
1081 | goto out; | |
1082 | } | |
1083 | if (former_parent) { | |
1084 | spin_lock_irq(former_parent->lock); | |
1085 | former_parent->dev.driver_data = NULL; | |
1086 | spin_unlock_irq(former_parent->lock); | |
1087 | css_sch_device_unregister(former_parent); | |
1088 | /* Reset intparm to zeroes. */ | |
1089 | former_parent->schib.pmcw.intparm = 0; | |
1090 | cio_modify(former_parent); | |
1091 | } | |
1092 | sch_attach_device(sch, cdev); | |
1093 | out: | |
1094 | if (former_parent) | |
1095 | put_device(&former_parent->dev); | |
1096 | put_device(&cdev->dev); | |
1097 | } | |
1098 | ||
1da177e4 | 1099 | static int |
8bbace7e | 1100 | io_subchannel_probe (struct subchannel *sch) |
1da177e4 | 1101 | { |
1da177e4 LT |
1102 | struct ccw_device *cdev; |
1103 | int rc; | |
1104 | unsigned long flags; | |
d7b5a4c9 | 1105 | struct ccw_dev_id dev_id; |
1da177e4 | 1106 | |
1da177e4 LT |
1107 | if (sch->dev.driver_data) { |
1108 | /* | |
1109 | * This subchannel already has an associated ccw_device. | |
1110 | * Register it and exit. This happens for all early | |
1111 | * device, e.g. the console. | |
1112 | */ | |
1113 | cdev = sch->dev.driver_data; | |
e1031786 | 1114 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1115 | device_initialize(&cdev->dev); |
1116 | ccw_device_register(cdev); | |
1da177e4 LT |
1117 | /* |
1118 | * Check if the device is already online. If it is | |
1119 | * the reference count needs to be corrected | |
1120 | * (see ccw_device_online and css_init_done for the | |
1121 | * ugly details). | |
1122 | */ | |
1123 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1124 | cdev->private->state != DEV_STATE_OFFLINE && | |
1125 | cdev->private->state != DEV_STATE_BOXED) | |
1126 | get_device(&cdev->dev); | |
1127 | return 0; | |
1128 | } | |
d7b5a4c9 CH |
1129 | /* |
1130 | * First check if a fitting device may be found amongst the | |
1131 | * disconnected devices or in the orphanage. | |
1132 | */ | |
1133 | dev_id.devno = sch->schib.pmcw.dev; | |
1134 | dev_id.ssid = sch->schid.ssid; | |
1135 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); | |
1136 | if (!cdev) | |
1137 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1138 | &dev_id); | |
1139 | if (cdev) { | |
1140 | /* | |
1141 | * Schedule moving the device until when we have a registered | |
1142 | * subchannel to move to and succeed the probe. We can | |
1143 | * unregister later again, when the probe is through. | |
1144 | */ | |
1145 | cdev->private->sch = sch; | |
1146 | PREPARE_WORK(&cdev->private->kick_work, | |
1147 | ccw_device_move_to_sch); | |
1148 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1149 | return 0; | |
1150 | } | |
7674da77 CH |
1151 | cdev = io_subchannel_create_ccwdev(sch); |
1152 | if (IS_ERR(cdev)) | |
1153 | return PTR_ERR(cdev); | |
1da177e4 | 1154 | |
8bbace7e | 1155 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1156 | if (rc) { |
2ec22984 | 1157 | spin_lock_irqsave(sch->lock, flags); |
1da177e4 | 1158 | sch->dev.driver_data = NULL; |
2ec22984 | 1159 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
1160 | if (cdev->dev.release) |
1161 | cdev->dev.release(&cdev->dev); | |
1162 | } | |
1163 | ||
1164 | return rc; | |
1165 | } | |
1166 | ||
1da177e4 | 1167 | static int |
8bbace7e | 1168 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1169 | { |
1170 | struct ccw_device *cdev; | |
1171 | unsigned long flags; | |
1172 | ||
8bbace7e | 1173 | if (!sch->dev.driver_data) |
1da177e4 | 1174 | return 0; |
8bbace7e | 1175 | cdev = sch->dev.driver_data; |
1da177e4 LT |
1176 | /* Set ccw device to not operational and drop reference. */ |
1177 | spin_lock_irqsave(cdev->ccwlock, flags); | |
8bbace7e | 1178 | sch->dev.driver_data = NULL; |
1da177e4 LT |
1179 | cdev->private->state = DEV_STATE_NOT_OPER; |
1180 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c CH |
1181 | ccw_device_unregister(cdev); |
1182 | put_device(&cdev->dev); | |
1da177e4 LT |
1183 | return 0; |
1184 | } | |
1185 | ||
1186 | static int | |
1187 | io_subchannel_notify(struct device *dev, int event) | |
1188 | { | |
1189 | struct ccw_device *cdev; | |
1190 | ||
1191 | cdev = dev->driver_data; | |
1192 | if (!cdev) | |
1193 | return 0; | |
1194 | if (!cdev->drv) | |
1195 | return 0; | |
1196 | if (!cdev->online) | |
1197 | return 0; | |
1198 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; | |
1199 | } | |
1200 | ||
1201 | static void | |
1202 | io_subchannel_verify(struct device *dev) | |
1203 | { | |
1204 | struct ccw_device *cdev; | |
1205 | ||
1206 | cdev = dev->driver_data; | |
1207 | if (cdev) | |
1208 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1209 | } | |
1210 | ||
1211 | static void | |
1212 | io_subchannel_ioterm(struct device *dev) | |
1213 | { | |
1214 | struct ccw_device *cdev; | |
1215 | ||
1216 | cdev = dev->driver_data; | |
1217 | if (!cdev) | |
1218 | return; | |
d23861ff CH |
1219 | /* Internal I/O will be retried by the interrupt handler. */ |
1220 | if (cdev->private->flags.intretry) | |
1221 | return; | |
1da177e4 LT |
1222 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
1223 | if (cdev->handler) | |
1224 | cdev->handler(cdev, cdev->private->intparm, | |
1225 | ERR_PTR(-EIO)); | |
1226 | } | |
1227 | ||
1228 | static void | |
8bbace7e | 1229 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1230 | { |
1da177e4 LT |
1231 | struct ccw_device *cdev; |
1232 | int ret; | |
1233 | ||
8bbace7e | 1234 | cdev = sch->dev.driver_data; |
1da177e4 | 1235 | |
a8237fc4 | 1236 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1237 | return; |
1238 | if (!sch->schib.pmcw.ena) | |
1239 | /* Nothing to do. */ | |
1240 | return; | |
1241 | ret = cio_disable_subchannel(sch); | |
1242 | if (ret != -EBUSY) | |
1243 | /* Subchannel is disabled, we're done. */ | |
1244 | return; | |
1245 | cdev->private->state = DEV_STATE_QUIESCE; | |
1246 | if (cdev->handler) | |
1247 | cdev->handler(cdev, cdev->private->intparm, | |
1248 | ERR_PTR(-EIO)); | |
1249 | ret = ccw_device_cancel_halt_clear(cdev); | |
1250 | if (ret == -EBUSY) { | |
1251 | ccw_device_set_timeout(cdev, HZ/10); | |
1252 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1253 | } | |
1254 | cio_disable_subchannel(sch); | |
1255 | } | |
1256 | ||
1257 | #ifdef CONFIG_CCW_CONSOLE | |
1258 | static struct ccw_device console_cdev; | |
1259 | static struct ccw_device_private console_private; | |
1260 | static int console_cdev_in_use; | |
1261 | ||
2ec22984 CH |
1262 | static DEFINE_SPINLOCK(ccw_console_lock); |
1263 | ||
1264 | spinlock_t * cio_get_console_lock(void) | |
1265 | { | |
1266 | return &ccw_console_lock; | |
1267 | } | |
1268 | ||
1da177e4 LT |
1269 | static int |
1270 | ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch) | |
1271 | { | |
1272 | int rc; | |
1273 | ||
1274 | /* Initialize the ccw_device structure. */ | |
292888c8 | 1275 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1276 | rc = io_subchannel_recog(cdev, sch); |
1277 | if (rc) | |
1278 | return rc; | |
1279 | ||
1280 | /* Now wait for the async. recognition to come to an end. */ | |
1281 | spin_lock_irq(cdev->ccwlock); | |
1282 | while (!dev_fsm_final_state(cdev)) | |
1283 | wait_cons_dev(); | |
1284 | rc = -EIO; | |
1285 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1286 | goto out_unlock; | |
1287 | ccw_device_online(cdev); | |
1288 | while (!dev_fsm_final_state(cdev)) | |
1289 | wait_cons_dev(); | |
1290 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1291 | goto out_unlock; | |
1292 | rc = 0; | |
1293 | out_unlock: | |
1294 | spin_unlock_irq(cdev->ccwlock); | |
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | struct ccw_device * | |
1299 | ccw_device_probe_console(void) | |
1300 | { | |
1301 | struct subchannel *sch; | |
1302 | int ret; | |
1303 | ||
1304 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1305 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1306 | sch = cio_probe_console(); |
1307 | if (IS_ERR(sch)) { | |
1308 | console_cdev_in_use = 0; | |
1309 | return (void *) sch; | |
1310 | } | |
1311 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1312 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1313 | console_cdev.private = &console_private; | |
c1637532 | 1314 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1315 | ret = ccw_device_console_enable(&console_cdev, sch); |
1316 | if (ret) { | |
1317 | cio_release_console(); | |
1318 | console_cdev_in_use = 0; | |
1319 | return ERR_PTR(ret); | |
1320 | } | |
1321 | console_cdev.online = 1; | |
1322 | return &console_cdev; | |
1323 | } | |
1324 | #endif | |
1325 | ||
1326 | /* | |
1327 | * get ccw_device matching the busid, but only if owned by cdrv | |
1328 | */ | |
b0744bd2 CH |
1329 | static int |
1330 | __ccwdev_check_busid(struct device *dev, void *id) | |
1331 | { | |
1332 | char *bus_id; | |
1333 | ||
12975aef | 1334 | bus_id = id; |
b0744bd2 CH |
1335 | |
1336 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); | |
1337 | } | |
1338 | ||
1339 | ||
b2ffd8e9 CH |
1340 | /** |
1341 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1342 | * @cdrv: driver the device is owned by | |
1343 | * @bus_id: bus id of the device to be searched | |
1344 | * | |
1345 | * This function searches all devices owned by @cdrv for a device with a bus | |
1346 | * id matching @bus_id. | |
1347 | * Returns: | |
1348 | * If a match is found, its reference count of the found device is increased | |
1349 | * and it is returned; else %NULL is returned. | |
1350 | */ | |
1351 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1352 | const char *bus_id) | |
1da177e4 | 1353 | { |
b0744bd2 | 1354 | struct device *dev; |
1da177e4 LT |
1355 | struct device_driver *drv; |
1356 | ||
1357 | drv = get_driver(&cdrv->driver); | |
1358 | if (!drv) | |
b0744bd2 | 1359 | return NULL; |
1da177e4 | 1360 | |
b0744bd2 CH |
1361 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1362 | __ccwdev_check_busid); | |
1da177e4 LT |
1363 | put_driver(drv); |
1364 | ||
d2c993d8 | 1365 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1366 | } |
1367 | ||
1368 | /************************** device driver handling ************************/ | |
1369 | ||
1370 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1371 | * and release methods are initially very similar to the device_driver | |
1372 | * implementations, with the difference that they have ccw_device | |
1373 | * arguments. | |
1374 | * | |
1375 | * A ccw driver also contains the information that is needed for | |
1376 | * device matching. | |
1377 | */ | |
1378 | static int | |
1379 | ccw_device_probe (struct device *dev) | |
1380 | { | |
1381 | struct ccw_device *cdev = to_ccwdev(dev); | |
1382 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1383 | int ret; | |
1384 | ||
1385 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1386 | ||
1387 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1388 | ||
1389 | if (ret) { | |
d2c993d8 | 1390 | cdev->drv = NULL; |
1da177e4 LT |
1391 | return ret; |
1392 | } | |
1393 | ||
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | static int | |
1398 | ccw_device_remove (struct device *dev) | |
1399 | { | |
1400 | struct ccw_device *cdev = to_ccwdev(dev); | |
1401 | struct ccw_driver *cdrv = cdev->drv; | |
1402 | int ret; | |
1403 | ||
1da177e4 LT |
1404 | if (cdrv->remove) |
1405 | cdrv->remove(cdev); | |
1406 | if (cdev->online) { | |
1407 | cdev->online = 0; | |
1408 | spin_lock_irq(cdev->ccwlock); | |
1409 | ret = ccw_device_offline(cdev); | |
1410 | spin_unlock_irq(cdev->ccwlock); | |
1411 | if (ret == 0) | |
1412 | wait_event(cdev->private->wait_q, | |
1413 | dev_fsm_final_state(cdev)); | |
1414 | else | |
1415 | //FIXME: we can't fail! | |
e556bbbd CH |
1416 | CIO_MSG_EVENT(2, "ccw_device_offline returned %d, " |
1417 | "device 0.%x.%04x\n", | |
1418 | ret, cdev->private->dev_id.ssid, | |
1419 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1420 | } |
1421 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1422 | cdev->drv = NULL; |
1da177e4 LT |
1423 | return 0; |
1424 | } | |
1425 | ||
958974fb CH |
1426 | static void ccw_device_shutdown(struct device *dev) |
1427 | { | |
1428 | struct ccw_device *cdev; | |
1429 | ||
1430 | cdev = to_ccwdev(dev); | |
1431 | if (cdev->drv && cdev->drv->shutdown) | |
1432 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1433 | disable_cmf(cdev); |
958974fb CH |
1434 | } |
1435 | ||
8bbace7e CH |
1436 | struct bus_type ccw_bus_type = { |
1437 | .name = "ccw", | |
1438 | .match = ccw_bus_match, | |
1439 | .uevent = ccw_uevent, | |
1440 | .probe = ccw_device_probe, | |
1441 | .remove = ccw_device_remove, | |
958974fb | 1442 | .shutdown = ccw_device_shutdown, |
8bbace7e CH |
1443 | }; |
1444 | ||
b2ffd8e9 CH |
1445 | /** |
1446 | * ccw_driver_register() - register a ccw driver | |
1447 | * @cdriver: driver to be registered | |
1448 | * | |
1449 | * This function is mainly a wrapper around driver_register(). | |
1450 | * Returns: | |
1451 | * %0 on success and a negative error value on failure. | |
1452 | */ | |
1453 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1454 | { |
1455 | struct device_driver *drv = &cdriver->driver; | |
1456 | ||
1457 | drv->bus = &ccw_bus_type; | |
1458 | drv->name = cdriver->name; | |
1da177e4 LT |
1459 | |
1460 | return driver_register(drv); | |
1461 | } | |
1462 | ||
b2ffd8e9 CH |
1463 | /** |
1464 | * ccw_driver_unregister() - deregister a ccw driver | |
1465 | * @cdriver: driver to be deregistered | |
1466 | * | |
1467 | * This function is mainly a wrapper around driver_unregister(). | |
1468 | */ | |
1469 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1470 | { |
1471 | driver_unregister(&cdriver->driver); | |
1472 | } | |
1473 | ||
a8237fc4 CH |
1474 | /* Helper func for qdio. */ |
1475 | struct subchannel_id | |
1476 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1477 | { | |
1478 | struct subchannel *sch; | |
1479 | ||
1480 | sch = to_subchannel(cdev->dev.parent); | |
1481 | return sch->schid; | |
1482 | } | |
1483 | ||
1da177e4 LT |
1484 | MODULE_LICENSE("GPL"); |
1485 | EXPORT_SYMBOL(ccw_device_set_online); | |
1486 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1487 | EXPORT_SYMBOL(ccw_driver_register); | |
1488 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1489 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1490 | EXPORT_SYMBOL(ccw_bus_type); | |
1491 | EXPORT_SYMBOL(ccw_device_work); | |
1492 | EXPORT_SYMBOL(ccw_device_notify_work); | |
a8237fc4 | 1493 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |