Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
4ce3b30c | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
9 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
10 | */ | |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/workqueue.h> | |
20 | ||
21 | #include <asm/ccwdev.h> | |
22 | #include <asm/cio.h> | |
4e57b681 | 23 | #include <asm/param.h> /* HZ */ |
1da177e4 LT |
24 | |
25 | #include "cio.h" | |
d7b5a4c9 | 26 | #include "cio_debug.h" |
1da177e4 LT |
27 | #include "css.h" |
28 | #include "device.h" | |
29 | #include "ioasm.h" | |
30 | ||
31 | /******************* bus type handling ***********************/ | |
32 | ||
33 | /* The Linux driver model distinguishes between a bus type and | |
34 | * the bus itself. Of course we only have one channel | |
35 | * subsystem driver and one channel system per machine, but | |
36 | * we still use the abstraction. T.R. says it's a good idea. */ | |
37 | static int | |
38 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
39 | { | |
40 | struct ccw_device *cdev = to_ccwdev(dev); | |
41 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
42 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
43 | ||
44 | if (!ids) | |
45 | return 0; | |
46 | ||
47 | found = ccw_device_id_match(ids, &cdev->id); | |
48 | if (!found) | |
49 | return 0; | |
50 | ||
51 | cdev->id.driver_info = found->driver_info; | |
52 | ||
53 | return 1; | |
54 | } | |
55 | ||
db0c2d59 PO |
56 | /* Store modalias string delimited by prefix/suffix string into buffer with |
57 | * specified size. Return length of resulting string (excluding trailing '\0') | |
58 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 59 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 60 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 61 | { |
db0c2d59 | 62 | int len; |
1da177e4 | 63 | |
cfbe9bb2 | 64 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
65 | if (len > size) |
66 | return len; | |
67 | buf += len; | |
68 | size -= len; | |
1da177e4 | 69 | |
db0c2d59 PO |
70 | if (id->dev_type != 0) |
71 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
72 | id->dev_model, suffix); | |
73 | else | |
74 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 75 | |
db0c2d59 PO |
76 | return len; |
77 | } | |
78 | ||
79 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
80 | * non-zero otherwise. */ | |
81 | static int ccw_uevent(struct device *dev, char **envp, int num_envp, | |
82 | char *buffer, int buffer_size) | |
83 | { | |
84 | struct ccw_device *cdev = to_ccwdev(dev); | |
85 | struct ccw_device_id *id = &(cdev->id); | |
86 | int i = 0; | |
cfbe9bb2 CH |
87 | int len = 0; |
88 | int ret; | |
89 | char modalias_buf[30]; | |
1da177e4 | 90 | |
db0c2d59 | 91 | /* CU_TYPE= */ |
cfbe9bb2 CH |
92 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
93 | "CU_TYPE=%04X", id->cu_type); | |
94 | if (ret) | |
95 | return ret; | |
db0c2d59 PO |
96 | |
97 | /* CU_MODEL= */ | |
cfbe9bb2 CH |
98 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
99 | "CU_MODEL=%02X", id->cu_model); | |
100 | if (ret) | |
101 | return ret; | |
1da177e4 LT |
102 | |
103 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 104 | /* DEV_TYPE= */ |
cfbe9bb2 CH |
105 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
106 | "DEV_TYPE=%04X", id->dev_type); | |
107 | if (ret) | |
108 | return ret; | |
1da177e4 | 109 | |
db0c2d59 | 110 | /* DEV_MODEL= */ |
cfbe9bb2 CH |
111 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
112 | "DEV_MODEL=%02X", id->dev_model); | |
113 | if (ret) | |
114 | return ret; | |
db0c2d59 PO |
115 | |
116 | /* MODALIAS= */ | |
cfbe9bb2 CH |
117 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
118 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, | |
119 | "MODALIAS=%s", modalias_buf); | |
3520c922 CH |
120 | if (ret) |
121 | return ret; | |
122 | envp[i] = NULL; | |
123 | return 0; | |
1da177e4 LT |
124 | } |
125 | ||
8bbace7e | 126 | struct bus_type ccw_bus_type; |
1da177e4 | 127 | |
8bbace7e CH |
128 | static int io_subchannel_probe (struct subchannel *); |
129 | static int io_subchannel_remove (struct subchannel *); | |
1da177e4 LT |
130 | static int io_subchannel_notify(struct device *, int); |
131 | static void io_subchannel_verify(struct device *); | |
132 | static void io_subchannel_ioterm(struct device *); | |
8bbace7e | 133 | static void io_subchannel_shutdown(struct subchannel *); |
1da177e4 | 134 | |
f7e5d67c | 135 | static struct css_driver io_subchannel_driver = { |
1da177e4 LT |
136 | .subchannel_type = SUBCHANNEL_TYPE_IO, |
137 | .drv = { | |
138 | .name = "io_subchannel", | |
139 | .bus = &css_bus_type, | |
1da177e4 LT |
140 | }, |
141 | .irq = io_subchannel_irq, | |
142 | .notify = io_subchannel_notify, | |
143 | .verify = io_subchannel_verify, | |
144 | .termination = io_subchannel_ioterm, | |
8bbace7e CH |
145 | .probe = io_subchannel_probe, |
146 | .remove = io_subchannel_remove, | |
147 | .shutdown = io_subchannel_shutdown, | |
1da177e4 LT |
148 | }; |
149 | ||
150 | struct workqueue_struct *ccw_device_work; | |
151 | struct workqueue_struct *ccw_device_notify_work; | |
40154b82 PO |
152 | wait_queue_head_t ccw_device_init_wq; |
153 | atomic_t ccw_device_init_count; | |
1da177e4 LT |
154 | |
155 | static int __init | |
156 | init_ccw_bus_type (void) | |
157 | { | |
158 | int ret; | |
159 | ||
160 | init_waitqueue_head(&ccw_device_init_wq); | |
161 | atomic_set(&ccw_device_init_count, 0); | |
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 | ||
179 | if ((ret = driver_register(&io_subchannel_driver.drv))) | |
180 | goto out_err; | |
181 | ||
182 | wait_event(ccw_device_init_wq, | |
183 | atomic_read(&ccw_device_init_count) == 0); | |
184 | flush_workqueue(ccw_device_work); | |
185 | return 0; | |
186 | out_err: | |
187 | if (ccw_device_work) | |
188 | destroy_workqueue(ccw_device_work); | |
189 | if (ccw_device_notify_work) | |
190 | destroy_workqueue(ccw_device_notify_work); | |
191 | if (slow_path_wq) | |
192 | destroy_workqueue(slow_path_wq); | |
193 | return ret; | |
194 | } | |
195 | ||
196 | static void __exit | |
197 | cleanup_ccw_bus_type (void) | |
198 | { | |
199 | driver_unregister(&io_subchannel_driver.drv); | |
200 | bus_unregister(&ccw_bus_type); | |
201 | destroy_workqueue(ccw_device_notify_work); | |
202 | destroy_workqueue(ccw_device_work); | |
203 | } | |
204 | ||
205 | subsys_initcall(init_ccw_bus_type); | |
206 | module_exit(cleanup_ccw_bus_type); | |
207 | ||
208 | /************************ device handling **************************/ | |
209 | ||
210 | /* | |
211 | * A ccw_device has some interfaces in sysfs in addition to the | |
212 | * standard ones. | |
213 | * The following entries are designed to export the information which | |
214 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
215 | * are obvious, so they don't have an entry :) | |
216 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
217 | */ | |
218 | static ssize_t | |
3fd3c0a5 | 219 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
220 | { |
221 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 222 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
223 | ssize_t ret = 0; |
224 | int chp; | |
7ad6a249 PO |
225 | int mask; |
226 | ||
227 | for (chp = 0; chp < 8; chp++) { | |
228 | mask = 0x80 >> chp; | |
229 | if (ssd->path_mask & mask) | |
230 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
231 | else | |
232 | ret += sprintf(buf + ret, "00 "); | |
233 | } | |
1da177e4 LT |
234 | ret += sprintf (buf+ret, "\n"); |
235 | return min((ssize_t)PAGE_SIZE, ret); | |
236 | } | |
237 | ||
238 | static ssize_t | |
3fd3c0a5 | 239 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
240 | { |
241 | struct subchannel *sch = to_subchannel(dev); | |
242 | struct pmcw *pmcw = &sch->schib.pmcw; | |
243 | ||
244 | return sprintf (buf, "%02x %02x %02x\n", | |
245 | pmcw->pim, pmcw->pam, pmcw->pom); | |
246 | } | |
247 | ||
248 | static ssize_t | |
3fd3c0a5 | 249 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
250 | { |
251 | struct ccw_device *cdev = to_ccwdev(dev); | |
252 | struct ccw_device_id *id = &(cdev->id); | |
253 | ||
254 | if (id->dev_type != 0) | |
255 | return sprintf(buf, "%04x/%02x\n", | |
256 | id->dev_type, id->dev_model); | |
257 | else | |
258 | return sprintf(buf, "n/a\n"); | |
259 | } | |
260 | ||
261 | static ssize_t | |
3fd3c0a5 | 262 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
263 | { |
264 | struct ccw_device *cdev = to_ccwdev(dev); | |
265 | struct ccw_device_id *id = &(cdev->id); | |
266 | ||
267 | return sprintf(buf, "%04x/%02x\n", | |
268 | id->cu_type, id->cu_model); | |
269 | } | |
270 | ||
f1fc78a8 BB |
271 | static ssize_t |
272 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
273 | { | |
274 | struct ccw_device *cdev = to_ccwdev(dev); | |
275 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 276 | int len; |
f1fc78a8 | 277 | |
086a6c62 | 278 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
279 | |
280 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
281 | } |
282 | ||
1da177e4 | 283 | static ssize_t |
3fd3c0a5 | 284 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
285 | { |
286 | struct ccw_device *cdev = to_ccwdev(dev); | |
287 | ||
288 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
289 | } | |
290 | ||
d7b5a4c9 CH |
291 | int ccw_device_is_orphan(struct ccw_device *cdev) |
292 | { | |
293 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
294 | } | |
295 | ||
ef99516c | 296 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 297 | { |
7674da77 | 298 | if (test_and_clear_bit(1, &cdev->private->registered)) |
ef99516c | 299 | device_del(&cdev->dev); |
7674da77 CH |
300 | } |
301 | ||
59a8a6e2 CH |
302 | static void ccw_device_remove_orphan_cb(struct device *dev) |
303 | { | |
304 | struct ccw_device *cdev = to_ccwdev(dev); | |
305 | ||
306 | ccw_device_unregister(cdev); | |
307 | put_device(&cdev->dev); | |
308 | } | |
309 | ||
310 | static void ccw_device_remove_sch_cb(struct device *dev) | |
311 | { | |
312 | struct subchannel *sch; | |
313 | ||
314 | sch = to_subchannel(dev); | |
315 | css_sch_device_unregister(sch); | |
316 | /* Reset intparm to zeroes. */ | |
317 | sch->schib.pmcw.intparm = 0; | |
318 | cio_modify(sch); | |
319 | put_device(&sch->dev); | |
320 | } | |
321 | ||
1da177e4 LT |
322 | static void |
323 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
324 | { | |
d7b5a4c9 | 325 | unsigned long flags; |
59a8a6e2 CH |
326 | int rc; |
327 | ||
1da177e4 LT |
328 | /* |
329 | * Forced offline in disconnected state means | |
330 | * 'throw away device'. | |
331 | */ | |
d7b5a4c9 | 332 | if (ccw_device_is_orphan(cdev)) { |
59a8a6e2 CH |
333 | /* |
334 | * Deregister ccw device. | |
335 | * Unfortunately, we cannot do this directly from the | |
336 | * attribute method. | |
337 | */ | |
d7b5a4c9 CH |
338 | spin_lock_irqsave(cdev->ccwlock, flags); |
339 | cdev->private->state = DEV_STATE_NOT_OPER; | |
340 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
59a8a6e2 CH |
341 | rc = device_schedule_callback(&cdev->dev, |
342 | ccw_device_remove_orphan_cb); | |
343 | if (rc) | |
e556bbbd CH |
344 | CIO_MSG_EVENT(2, "Couldn't unregister orphan " |
345 | "0.%x.%04x\n", | |
346 | cdev->private->dev_id.ssid, | |
347 | cdev->private->dev_id.devno); | |
59a8a6e2 | 348 | return; |
d7b5a4c9 | 349 | } |
59a8a6e2 CH |
350 | /* Deregister subchannel, which will kill the ccw device. */ |
351 | rc = device_schedule_callback(cdev->dev.parent, | |
352 | ccw_device_remove_sch_cb); | |
353 | if (rc) | |
e556bbbd CH |
354 | CIO_MSG_EVENT(2, "Couldn't unregister disconnected device " |
355 | "0.%x.%04x\n", | |
356 | cdev->private->dev_id.ssid, | |
357 | cdev->private->dev_id.devno); | |
1da177e4 LT |
358 | } |
359 | ||
b2ffd8e9 CH |
360 | /** |
361 | * ccw_device_set_offline() - disable a ccw device for I/O | |
362 | * @cdev: target ccw device | |
363 | * | |
364 | * This function calls the driver's set_offline() function for @cdev, if | |
365 | * given, and then disables @cdev. | |
366 | * Returns: | |
367 | * %0 on success and a negative error value on failure. | |
368 | * Context: | |
369 | * enabled, ccw device lock not held | |
370 | */ | |
371 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 LT |
372 | { |
373 | int ret; | |
374 | ||
375 | if (!cdev) | |
376 | return -ENODEV; | |
377 | if (!cdev->online || !cdev->drv) | |
378 | return -EINVAL; | |
379 | ||
380 | if (cdev->drv->set_offline) { | |
381 | ret = cdev->drv->set_offline(cdev); | |
382 | if (ret != 0) | |
383 | return ret; | |
384 | } | |
385 | cdev->online = 0; | |
386 | spin_lock_irq(cdev->ccwlock); | |
387 | ret = ccw_device_offline(cdev); | |
388 | if (ret == -ENODEV) { | |
389 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
390 | cdev->private->state = DEV_STATE_OFFLINE; | |
391 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
392 | } | |
393 | spin_unlock_irq(cdev->ccwlock); | |
394 | return ret; | |
395 | } | |
396 | spin_unlock_irq(cdev->ccwlock); | |
397 | if (ret == 0) | |
398 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
399 | else { | |
e556bbbd CH |
400 | CIO_MSG_EVENT(2, "ccw_device_offline returned %d, " |
401 | "device 0.%x.%04x\n", | |
402 | ret, cdev->private->dev_id.ssid, | |
403 | cdev->private->dev_id.devno); | |
1da177e4 LT |
404 | cdev->online = 1; |
405 | } | |
406 | return ret; | |
407 | } | |
408 | ||
b2ffd8e9 CH |
409 | /** |
410 | * ccw_device_set_online() - enable a ccw device for I/O | |
411 | * @cdev: target ccw device | |
412 | * | |
413 | * This function first enables @cdev and then calls the driver's set_online() | |
414 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
415 | * disabled again. | |
416 | * Returns: | |
417 | * %0 on success and a negative error value on failure. | |
418 | * Context: | |
419 | * enabled, ccw device lock not held | |
420 | */ | |
421 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
422 | { |
423 | int ret; | |
424 | ||
425 | if (!cdev) | |
426 | return -ENODEV; | |
427 | if (cdev->online || !cdev->drv) | |
428 | return -EINVAL; | |
429 | ||
430 | spin_lock_irq(cdev->ccwlock); | |
431 | ret = ccw_device_online(cdev); | |
432 | spin_unlock_irq(cdev->ccwlock); | |
433 | if (ret == 0) | |
434 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
435 | else { | |
e556bbbd CH |
436 | CIO_MSG_EVENT(2, "ccw_device_online returned %d, " |
437 | "device 0.%x.%04x\n", | |
438 | ret, cdev->private->dev_id.ssid, | |
439 | cdev->private->dev_id.devno); | |
1da177e4 LT |
440 | return ret; |
441 | } | |
442 | if (cdev->private->state != DEV_STATE_ONLINE) | |
443 | return -ENODEV; | |
444 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { | |
445 | cdev->online = 1; | |
446 | return 0; | |
447 | } | |
448 | spin_lock_irq(cdev->ccwlock); | |
449 | ret = ccw_device_offline(cdev); | |
450 | spin_unlock_irq(cdev->ccwlock); | |
451 | if (ret == 0) | |
452 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
e556bbbd CH |
453 | else |
454 | CIO_MSG_EVENT(2, "ccw_device_offline returned %d, " | |
455 | "device 0.%x.%04x\n", | |
456 | ret, cdev->private->dev_id.ssid, | |
457 | cdev->private->dev_id.devno); | |
6cadb78b | 458 | return (ret == 0) ? -ENODEV : ret; |
1da177e4 LT |
459 | } |
460 | ||
f5ba6c86 CH |
461 | static void online_store_handle_offline(struct ccw_device *cdev) |
462 | { | |
463 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
464 | ccw_device_remove_disconnected(cdev); | |
465 | else if (cdev->drv && cdev->drv->set_offline) | |
466 | ccw_device_set_offline(cdev); | |
467 | } | |
468 | ||
469 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
470 | { | |
471 | int ret; | |
472 | ||
473 | /* Do device recognition, if needed. */ | |
474 | if (cdev->id.cu_type == 0) { | |
475 | ret = ccw_device_recognition(cdev); | |
476 | if (ret) { | |
e556bbbd CH |
477 | CIO_MSG_EVENT(0, "Couldn't start recognition " |
478 | "for device 0.%x.%04x (ret=%d)\n", | |
479 | cdev->private->dev_id.ssid, | |
480 | cdev->private->dev_id.devno, ret); | |
f5ba6c86 CH |
481 | return ret; |
482 | } | |
483 | wait_event(cdev->private->wait_q, | |
484 | cdev->private->flags.recog_done); | |
485 | } | |
486 | if (cdev->drv && cdev->drv->set_online) | |
487 | ccw_device_set_online(cdev); | |
488 | return 0; | |
489 | } | |
490 | static void online_store_handle_online(struct ccw_device *cdev, int force) | |
491 | { | |
492 | int ret; | |
493 | ||
494 | ret = online_store_recog_and_online(cdev); | |
495 | if (ret) | |
496 | return; | |
497 | if (force && cdev->private->state == DEV_STATE_BOXED) { | |
498 | ret = ccw_device_stlck(cdev); | |
499 | if (ret) { | |
e556bbbd CH |
500 | dev_warn(&cdev->dev, |
501 | "ccw_device_stlck returned %d!\n", ret); | |
f5ba6c86 CH |
502 | return; |
503 | } | |
504 | if (cdev->id.cu_type == 0) | |
505 | cdev->private->state = DEV_STATE_NOT_OPER; | |
506 | online_store_recog_and_online(cdev); | |
507 | } | |
508 | ||
509 | } | |
510 | ||
511 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
512 | const char *buf, size_t count) | |
1da177e4 LT |
513 | { |
514 | struct ccw_device *cdev = to_ccwdev(dev); | |
f5ba6c86 | 515 | int i, force; |
1da177e4 LT |
516 | char *tmp; |
517 | ||
973bd993 | 518 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 LT |
519 | return -EAGAIN; |
520 | ||
521 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
522 | atomic_set(&cdev->private->onoff, 0); | |
523 | return -EINVAL; | |
524 | } | |
525 | if (!strncmp(buf, "force\n", count)) { | |
526 | force = 1; | |
527 | i = 1; | |
528 | } else { | |
529 | force = 0; | |
530 | i = simple_strtoul(buf, &tmp, 16); | |
531 | } | |
f5ba6c86 CH |
532 | |
533 | switch (i) { | |
534 | case 0: | |
535 | online_store_handle_offline(cdev); | |
536 | break; | |
537 | case 1: | |
538 | online_store_handle_online(cdev, force); | |
539 | break; | |
540 | default: | |
541 | count = -EINVAL; | |
1da177e4 | 542 | } |
1da177e4 LT |
543 | if (cdev->drv) |
544 | module_put(cdev->drv->owner); | |
545 | atomic_set(&cdev->private->onoff, 0); | |
546 | return count; | |
547 | } | |
548 | ||
549 | static ssize_t | |
3fd3c0a5 | 550 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
551 | { |
552 | struct ccw_device *cdev = to_ccwdev(dev); | |
553 | struct subchannel *sch; | |
554 | ||
d7b5a4c9 CH |
555 | if (ccw_device_is_orphan(cdev)) |
556 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
557 | switch (cdev->private->state) { |
558 | case DEV_STATE_BOXED: | |
559 | return sprintf(buf, "boxed\n"); | |
560 | case DEV_STATE_DISCONNECTED: | |
561 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
562 | case DEV_STATE_NOT_OPER: | |
563 | sch = to_subchannel(dev->parent); | |
564 | if (!sch->lpm) | |
565 | return sprintf(buf, "no path\n"); | |
566 | else | |
567 | return sprintf(buf, "no device\n"); | |
568 | default: | |
569 | /* All other states considered fine. */ | |
570 | return sprintf(buf, "good\n"); | |
571 | } | |
572 | } | |
573 | ||
574 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
575 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
576 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
577 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 578 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 LT |
579 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
580 | extern struct device_attribute dev_attr_cmb_enable; | |
581 | static DEVICE_ATTR(availability, 0444, available_show, NULL); | |
582 | ||
583 | static struct attribute * subch_attrs[] = { | |
584 | &dev_attr_chpids.attr, | |
585 | &dev_attr_pimpampom.attr, | |
586 | NULL, | |
587 | }; | |
588 | ||
589 | static struct attribute_group subch_attr_group = { | |
590 | .attrs = subch_attrs, | |
591 | }; | |
592 | ||
529192f3 CH |
593 | struct attribute_group *subch_attr_groups[] = { |
594 | &subch_attr_group, | |
595 | NULL, | |
596 | }; | |
1da177e4 LT |
597 | |
598 | static struct attribute * ccwdev_attrs[] = { | |
599 | &dev_attr_devtype.attr, | |
600 | &dev_attr_cutype.attr, | |
f1fc78a8 | 601 | &dev_attr_modalias.attr, |
1da177e4 LT |
602 | &dev_attr_online.attr, |
603 | &dev_attr_cmb_enable.attr, | |
604 | &dev_attr_availability.attr, | |
605 | NULL, | |
606 | }; | |
607 | ||
608 | static struct attribute_group ccwdev_attr_group = { | |
609 | .attrs = ccwdev_attrs, | |
610 | }; | |
611 | ||
f7e5d67c | 612 | static struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
613 | &ccwdev_attr_group, |
614 | NULL, | |
615 | }; | |
1da177e4 LT |
616 | |
617 | /* this is a simple abstraction for device_register that sets the | |
618 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 619 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
620 | { |
621 | struct device *dev = &cdev->dev; | |
622 | int ret; | |
623 | ||
624 | dev->bus = &ccw_bus_type; | |
625 | ||
626 | if ((ret = device_add(dev))) | |
627 | return ret; | |
628 | ||
629 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
630 | return ret; |
631 | } | |
632 | ||
b0744bd2 | 633 | struct match_data { |
78964268 | 634 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
635 | struct ccw_device * sibling; |
636 | }; | |
637 | ||
638 | static int | |
639 | match_devno(struct device * dev, void * data) | |
640 | { | |
78964268 | 641 | struct match_data * d = data; |
b0744bd2 CH |
642 | struct ccw_device * cdev; |
643 | ||
644 | cdev = to_ccwdev(dev); | |
645 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 646 | !ccw_device_is_orphan(cdev) && |
78964268 | 647 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 648 | (cdev != d->sibling)) |
b0744bd2 | 649 | return 1; |
b0744bd2 CH |
650 | return 0; |
651 | } | |
652 | ||
78964268 CH |
653 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
654 | struct ccw_device *sibling) | |
1da177e4 | 655 | { |
1da177e4 | 656 | struct device *dev; |
292888c8 | 657 | struct match_data data; |
1da177e4 | 658 | |
78964268 | 659 | data.dev_id = *dev_id; |
292888c8 | 660 | data.sibling = sibling; |
e5945b4f | 661 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 662 | |
b0744bd2 | 663 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
664 | } |
665 | ||
d7b5a4c9 CH |
666 | static int match_orphan(struct device *dev, void *data) |
667 | { | |
668 | struct ccw_dev_id *dev_id; | |
669 | struct ccw_device *cdev; | |
670 | ||
671 | dev_id = data; | |
672 | cdev = to_ccwdev(dev); | |
673 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
674 | } | |
675 | ||
676 | static struct ccw_device * | |
677 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
678 | struct ccw_dev_id *dev_id) | |
679 | { | |
680 | struct device *dev; | |
681 | ||
682 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
683 | match_orphan); | |
684 | ||
685 | return dev ? to_ccwdev(dev) : NULL; | |
686 | } | |
687 | ||
1da177e4 | 688 | static void |
c1637532 | 689 | ccw_device_add_changed(struct work_struct *work) |
1da177e4 | 690 | { |
c1637532 | 691 | struct ccw_device_private *priv; |
1da177e4 LT |
692 | struct ccw_device *cdev; |
693 | ||
c1637532 MS |
694 | priv = container_of(work, struct ccw_device_private, kick_work); |
695 | cdev = priv->cdev; | |
1da177e4 LT |
696 | if (device_add(&cdev->dev)) { |
697 | put_device(&cdev->dev); | |
698 | return; | |
699 | } | |
700 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
701 | } |
702 | ||
d7b5a4c9 | 703 | void ccw_device_do_unreg_rereg(struct work_struct *work) |
1da177e4 | 704 | { |
c1637532 | 705 | struct ccw_device_private *priv; |
1da177e4 LT |
706 | struct ccw_device *cdev; |
707 | struct subchannel *sch; | |
1da177e4 | 708 | |
c1637532 MS |
709 | priv = container_of(work, struct ccw_device_private, kick_work); |
710 | cdev = priv->cdev; | |
1da177e4 | 711 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 712 | |
ef99516c | 713 | ccw_device_unregister(cdev); |
1da177e4 | 714 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 715 | ccw_device_add_changed); |
1da177e4 LT |
716 | queue_work(ccw_device_work, &cdev->private->kick_work); |
717 | } | |
718 | ||
719 | static void | |
720 | ccw_device_release(struct device *dev) | |
721 | { | |
722 | struct ccw_device *cdev; | |
723 | ||
724 | cdev = to_ccwdev(dev); | |
725 | kfree(cdev->private); | |
726 | kfree(cdev); | |
727 | } | |
728 | ||
7674da77 CH |
729 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
730 | { | |
731 | struct ccw_device *cdev; | |
732 | ||
733 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
734 | if (cdev) { | |
735 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
736 | GFP_KERNEL | GFP_DMA); | |
737 | if (cdev->private) | |
738 | return cdev; | |
739 | } | |
740 | kfree(cdev); | |
741 | return ERR_PTR(-ENOMEM); | |
742 | } | |
743 | ||
744 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
745 | struct ccw_device *cdev) | |
746 | { | |
747 | cdev->private->cdev = cdev; | |
748 | atomic_set(&cdev->private->onoff, 0); | |
749 | cdev->dev.parent = &sch->dev; | |
750 | cdev->dev.release = ccw_device_release; | |
751 | INIT_LIST_HEAD(&cdev->private->kick_work.entry); | |
ef99516c | 752 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
753 | /* Do first half of device_register. */ |
754 | device_initialize(&cdev->dev); | |
755 | if (!get_device(&sch->dev)) { | |
756 | if (cdev->dev.release) | |
757 | cdev->dev.release(&cdev->dev); | |
758 | return -ENODEV; | |
759 | } | |
760 | return 0; | |
761 | } | |
762 | ||
763 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
764 | { | |
765 | struct ccw_device *cdev; | |
766 | int ret; | |
767 | ||
768 | cdev = io_subchannel_allocate_dev(sch); | |
769 | if (!IS_ERR(cdev)) { | |
770 | ret = io_subchannel_initialize_dev(sch, cdev); | |
771 | if (ret) { | |
772 | kfree(cdev); | |
773 | cdev = ERR_PTR(ret); | |
774 | } | |
775 | } | |
776 | return cdev; | |
777 | } | |
778 | ||
d7b5a4c9 CH |
779 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
780 | ||
781 | static void sch_attach_device(struct subchannel *sch, | |
782 | struct ccw_device *cdev) | |
783 | { | |
82b7ac05 | 784 | css_update_ssd_info(sch); |
d7b5a4c9 CH |
785 | spin_lock_irq(sch->lock); |
786 | sch->dev.driver_data = cdev; | |
787 | cdev->private->schid = sch->schid; | |
788 | cdev->ccwlock = sch->lock; | |
789 | device_trigger_reprobe(sch); | |
790 | spin_unlock_irq(sch->lock); | |
791 | } | |
792 | ||
793 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
794 | struct ccw_device *cdev) | |
795 | { | |
796 | struct subchannel *other_sch; | |
797 | int ret; | |
798 | ||
799 | other_sch = to_subchannel(get_device(cdev->dev.parent)); | |
800 | ret = device_move(&cdev->dev, &sch->dev); | |
801 | if (ret) { | |
802 | CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed " | |
803 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
804 | cdev->private->dev_id.devno, ret); | |
805 | put_device(&other_sch->dev); | |
806 | return; | |
807 | } | |
808 | other_sch->dev.driver_data = NULL; | |
809 | /* No need to keep a subchannel without ccw device around. */ | |
810 | css_sch_device_unregister(other_sch); | |
811 | put_device(&other_sch->dev); | |
812 | sch_attach_device(sch, cdev); | |
813 | } | |
814 | ||
815 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
816 | struct ccw_device *cdev) | |
817 | { | |
818 | int ret; | |
819 | ||
820 | /* Try to move the ccw device to its new subchannel. */ | |
821 | ret = device_move(&cdev->dev, &sch->dev); | |
822 | if (ret) { | |
823 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
824 | "failed (ret=%d)!\n", | |
825 | cdev->private->dev_id.ssid, | |
826 | cdev->private->dev_id.devno, ret); | |
827 | return; | |
828 | } | |
829 | sch_attach_device(sch, cdev); | |
830 | } | |
831 | ||
832 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
833 | { | |
834 | struct ccw_device *cdev; | |
835 | ||
836 | /* Need to allocate a new ccw device. */ | |
837 | cdev = io_subchannel_create_ccwdev(sch); | |
838 | if (IS_ERR(cdev)) { | |
839 | /* OK, we did everything we could... */ | |
840 | css_sch_device_unregister(sch); | |
841 | return; | |
842 | } | |
843 | spin_lock_irq(sch->lock); | |
844 | sch->dev.driver_data = cdev; | |
845 | spin_unlock_irq(sch->lock); | |
846 | /* Start recognition for the new ccw device. */ | |
847 | if (io_subchannel_recog(cdev, sch)) { | |
848 | spin_lock_irq(sch->lock); | |
849 | sch->dev.driver_data = NULL; | |
850 | spin_unlock_irq(sch->lock); | |
851 | if (cdev->dev.release) | |
852 | cdev->dev.release(&cdev->dev); | |
853 | css_sch_device_unregister(sch); | |
854 | } | |
855 | } | |
856 | ||
857 | ||
858 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
859 | { | |
860 | struct ccw_device_private *priv; | |
861 | struct ccw_device *cdev; | |
862 | struct ccw_device *replacing_cdev; | |
863 | struct subchannel *sch; | |
864 | int ret; | |
865 | struct channel_subsystem *css; | |
866 | struct ccw_dev_id dev_id; | |
867 | ||
868 | priv = container_of(work, struct ccw_device_private, kick_work); | |
869 | cdev = priv->cdev; | |
870 | sch = to_subchannel(cdev->dev.parent); | |
871 | css = to_css(sch->dev.parent); | |
872 | dev_id.devno = sch->schib.pmcw.dev; | |
873 | dev_id.ssid = sch->schid.ssid; | |
874 | ||
875 | /* | |
876 | * Move the orphaned ccw device to the orphanage so the replacing | |
877 | * ccw device can take its place on the subchannel. | |
878 | */ | |
879 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev); | |
880 | if (ret) { | |
881 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
882 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
883 | cdev->private->dev_id.devno, ret); | |
884 | return; | |
885 | } | |
886 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
887 | /* | |
888 | * Search for the replacing ccw device | |
889 | * - among the disconnected devices | |
890 | * - in the orphanage | |
891 | */ | |
892 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
893 | if (replacing_cdev) { | |
894 | sch_attach_disconnected_device(sch, replacing_cdev); | |
895 | return; | |
896 | } | |
897 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
898 | if (replacing_cdev) { | |
899 | sch_attach_orphaned_device(sch, replacing_cdev); | |
900 | return; | |
901 | } | |
902 | sch_create_and_recog_new_device(sch); | |
903 | } | |
904 | ||
1da177e4 LT |
905 | /* |
906 | * Register recognized device. | |
907 | */ | |
908 | static void | |
c1637532 | 909 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 910 | { |
c1637532 | 911 | struct ccw_device_private *priv; |
1da177e4 LT |
912 | struct ccw_device *cdev; |
913 | struct subchannel *sch; | |
914 | int ret; | |
915 | unsigned long flags; | |
916 | ||
c1637532 MS |
917 | priv = container_of(work, struct ccw_device_private, kick_work); |
918 | cdev = priv->cdev; | |
1da177e4 | 919 | sch = to_subchannel(cdev->dev.parent); |
82b7ac05 | 920 | css_update_ssd_info(sch); |
47af5518 CH |
921 | /* |
922 | * io_subchannel_register() will also be called after device | |
923 | * recognition has been done for a boxed device (which will already | |
924 | * be registered). We need to reprobe since we may now have sense id | |
925 | * information. | |
926 | */ | |
b0744bd2 | 927 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
47af5518 CH |
928 | if (!cdev->drv) { |
929 | ret = device_reprobe(&cdev->dev); | |
930 | if (ret) | |
931 | /* We can't do much here. */ | |
e556bbbd CH |
932 | CIO_MSG_EVENT(2, "device_reprobe() returned" |
933 | " %d for 0.%x.%04x\n", ret, | |
934 | cdev->private->dev_id.ssid, | |
935 | cdev->private->dev_id.devno); | |
47af5518 | 936 | } |
1da177e4 LT |
937 | goto out; |
938 | } | |
fa1a8c23 CH |
939 | /* |
940 | * Now we know this subchannel will stay, we can throw | |
941 | * our delayed uevent. | |
942 | */ | |
943 | sch->dev.uevent_suppress = 0; | |
944 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
945 | /* make it known to the system */ |
946 | ret = ccw_device_register(cdev); | |
947 | if (ret) { | |
e556bbbd CH |
948 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
949 | cdev->private->dev_id.ssid, | |
950 | cdev->private->dev_id.devno, ret); | |
1da177e4 | 951 | put_device(&cdev->dev); |
2ec22984 | 952 | spin_lock_irqsave(sch->lock, flags); |
1da177e4 | 953 | sch->dev.driver_data = NULL; |
2ec22984 | 954 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
955 | kfree (cdev->private); |
956 | kfree (cdev); | |
957 | put_device(&sch->dev); | |
958 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
959 | wake_up(&ccw_device_init_wq); | |
960 | return; | |
961 | } | |
1da177e4 LT |
962 | put_device(&cdev->dev); |
963 | out: | |
964 | cdev->private->flags.recog_done = 1; | |
965 | put_device(&sch->dev); | |
966 | wake_up(&cdev->private->wait_q); | |
967 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
968 | wake_up(&ccw_device_init_wq); | |
969 | } | |
970 | ||
971 | void | |
c1637532 | 972 | ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 973 | { |
c1637532 MS |
974 | struct ccw_device_private *priv; |
975 | struct ccw_device *cdev; | |
1da177e4 LT |
976 | struct subchannel *sch; |
977 | ||
c1637532 MS |
978 | priv = container_of(work, struct ccw_device_private, kick_work); |
979 | cdev = priv->cdev; | |
1da177e4 | 980 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 981 | css_sch_device_unregister(sch); |
1da177e4 LT |
982 | /* Reset intparm to zeroes. */ |
983 | sch->schib.pmcw.intparm = 0; | |
984 | cio_modify(sch); | |
985 | put_device(&cdev->dev); | |
986 | put_device(&sch->dev); | |
987 | } | |
988 | ||
989 | /* | |
990 | * subchannel recognition done. Called from the state machine. | |
991 | */ | |
992 | void | |
993 | io_subchannel_recog_done(struct ccw_device *cdev) | |
994 | { | |
995 | struct subchannel *sch; | |
996 | ||
997 | if (css_init_done == 0) { | |
998 | cdev->private->flags.recog_done = 1; | |
999 | return; | |
1000 | } | |
1001 | switch (cdev->private->state) { | |
1002 | case DEV_STATE_NOT_OPER: | |
1003 | cdev->private->flags.recog_done = 1; | |
1004 | /* Remove device found not operational. */ | |
1005 | if (!get_device(&cdev->dev)) | |
1006 | break; | |
1007 | sch = to_subchannel(cdev->dev.parent); | |
1008 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1009 | ccw_device_call_sch_unregister); |
1da177e4 LT |
1010 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1011 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1012 | wake_up(&ccw_device_init_wq); | |
1013 | break; | |
1014 | case DEV_STATE_BOXED: | |
1015 | /* Device did not respond in time. */ | |
1016 | case DEV_STATE_OFFLINE: | |
1017 | /* | |
1018 | * We can't register the device in interrupt context so | |
1019 | * we schedule a work item. | |
1020 | */ | |
1021 | if (!get_device(&cdev->dev)) | |
1022 | break; | |
1023 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1024 | io_subchannel_register); |
1da177e4 LT |
1025 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1026 | break; | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | static int | |
1031 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
1032 | { | |
1033 | int rc; | |
1034 | struct ccw_device_private *priv; | |
1035 | ||
1036 | sch->dev.driver_data = cdev; | |
1037 | sch->driver = &io_subchannel_driver; | |
2ec22984 | 1038 | cdev->ccwlock = sch->lock; |
fb6958a5 | 1039 | |
1da177e4 LT |
1040 | /* Init private data. */ |
1041 | priv = cdev->private; | |
78964268 CH |
1042 | priv->dev_id.devno = sch->schib.pmcw.dev; |
1043 | priv->dev_id.ssid = sch->schid.ssid; | |
1044 | priv->schid = sch->schid; | |
1da177e4 LT |
1045 | priv->state = DEV_STATE_NOT_OPER; |
1046 | INIT_LIST_HEAD(&priv->cmb_list); | |
1047 | init_waitqueue_head(&priv->wait_q); | |
1048 | init_timer(&priv->timer); | |
1049 | ||
1050 | /* Set an initial name for the device. */ | |
fb6958a5 CH |
1051 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", |
1052 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 LT |
1053 | |
1054 | /* Increase counter of devices currently in recognition. */ | |
1055 | atomic_inc(&ccw_device_init_count); | |
1056 | ||
1057 | /* Start async. device sensing. */ | |
2ec22984 | 1058 | spin_lock_irq(sch->lock); |
1da177e4 | 1059 | rc = ccw_device_recognition(cdev); |
2ec22984 | 1060 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
1061 | if (rc) { |
1062 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1063 | wake_up(&ccw_device_init_wq); | |
1064 | } | |
1065 | return rc; | |
1066 | } | |
1067 | ||
d7b5a4c9 CH |
1068 | static void ccw_device_move_to_sch(struct work_struct *work) |
1069 | { | |
1070 | struct ccw_device_private *priv; | |
1071 | int rc; | |
1072 | struct subchannel *sch; | |
1073 | struct ccw_device *cdev; | |
1074 | struct subchannel *former_parent; | |
1075 | ||
1076 | priv = container_of(work, struct ccw_device_private, kick_work); | |
1077 | sch = priv->sch; | |
1078 | cdev = priv->cdev; | |
1079 | former_parent = ccw_device_is_orphan(cdev) ? | |
1080 | NULL : to_subchannel(get_device(cdev->dev.parent)); | |
1081 | mutex_lock(&sch->reg_mutex); | |
1082 | /* Try to move the ccw device to its new subchannel. */ | |
1083 | rc = device_move(&cdev->dev, &sch->dev); | |
1084 | mutex_unlock(&sch->reg_mutex); | |
1085 | if (rc) { | |
1086 | CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel " | |
1087 | "0.%x.%04x failed (ret=%d)!\n", | |
1088 | cdev->private->dev_id.ssid, | |
1089 | cdev->private->dev_id.devno, sch->schid.ssid, | |
1090 | sch->schid.sch_no, rc); | |
1091 | css_sch_device_unregister(sch); | |
1092 | goto out; | |
1093 | } | |
1094 | if (former_parent) { | |
1095 | spin_lock_irq(former_parent->lock); | |
1096 | former_parent->dev.driver_data = NULL; | |
1097 | spin_unlock_irq(former_parent->lock); | |
1098 | css_sch_device_unregister(former_parent); | |
1099 | /* Reset intparm to zeroes. */ | |
1100 | former_parent->schib.pmcw.intparm = 0; | |
1101 | cio_modify(former_parent); | |
1102 | } | |
1103 | sch_attach_device(sch, cdev); | |
1104 | out: | |
1105 | if (former_parent) | |
1106 | put_device(&former_parent->dev); | |
1107 | put_device(&cdev->dev); | |
1108 | } | |
1109 | ||
1da177e4 | 1110 | static int |
8bbace7e | 1111 | io_subchannel_probe (struct subchannel *sch) |
1da177e4 | 1112 | { |
1da177e4 LT |
1113 | struct ccw_device *cdev; |
1114 | int rc; | |
1115 | unsigned long flags; | |
d7b5a4c9 | 1116 | struct ccw_dev_id dev_id; |
1da177e4 | 1117 | |
1da177e4 LT |
1118 | if (sch->dev.driver_data) { |
1119 | /* | |
1120 | * This subchannel already has an associated ccw_device. | |
1121 | * Register it and exit. This happens for all early | |
1122 | * device, e.g. the console. | |
1123 | */ | |
1124 | cdev = sch->dev.driver_data; | |
1125 | device_initialize(&cdev->dev); | |
1126 | ccw_device_register(cdev); | |
1da177e4 LT |
1127 | /* |
1128 | * Check if the device is already online. If it is | |
1129 | * the reference count needs to be corrected | |
1130 | * (see ccw_device_online and css_init_done for the | |
1131 | * ugly details). | |
1132 | */ | |
1133 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1134 | cdev->private->state != DEV_STATE_OFFLINE && | |
1135 | cdev->private->state != DEV_STATE_BOXED) | |
1136 | get_device(&cdev->dev); | |
1137 | return 0; | |
1138 | } | |
d7b5a4c9 CH |
1139 | /* |
1140 | * First check if a fitting device may be found amongst the | |
1141 | * disconnected devices or in the orphanage. | |
1142 | */ | |
1143 | dev_id.devno = sch->schib.pmcw.dev; | |
1144 | dev_id.ssid = sch->schid.ssid; | |
1145 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); | |
1146 | if (!cdev) | |
1147 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1148 | &dev_id); | |
1149 | if (cdev) { | |
1150 | /* | |
1151 | * Schedule moving the device until when we have a registered | |
1152 | * subchannel to move to and succeed the probe. We can | |
1153 | * unregister later again, when the probe is through. | |
1154 | */ | |
1155 | cdev->private->sch = sch; | |
1156 | PREPARE_WORK(&cdev->private->kick_work, | |
1157 | ccw_device_move_to_sch); | |
1158 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1159 | return 0; | |
1160 | } | |
7674da77 CH |
1161 | cdev = io_subchannel_create_ccwdev(sch); |
1162 | if (IS_ERR(cdev)) | |
1163 | return PTR_ERR(cdev); | |
1da177e4 | 1164 | |
8bbace7e | 1165 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1166 | if (rc) { |
2ec22984 | 1167 | spin_lock_irqsave(sch->lock, flags); |
1da177e4 | 1168 | sch->dev.driver_data = NULL; |
2ec22984 | 1169 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
1170 | if (cdev->dev.release) |
1171 | cdev->dev.release(&cdev->dev); | |
1172 | } | |
1173 | ||
1174 | return rc; | |
1175 | } | |
1176 | ||
1da177e4 | 1177 | static int |
8bbace7e | 1178 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1179 | { |
1180 | struct ccw_device *cdev; | |
1181 | unsigned long flags; | |
1182 | ||
8bbace7e | 1183 | if (!sch->dev.driver_data) |
1da177e4 | 1184 | return 0; |
8bbace7e | 1185 | cdev = sch->dev.driver_data; |
1da177e4 LT |
1186 | /* Set ccw device to not operational and drop reference. */ |
1187 | spin_lock_irqsave(cdev->ccwlock, flags); | |
8bbace7e | 1188 | sch->dev.driver_data = NULL; |
1da177e4 LT |
1189 | cdev->private->state = DEV_STATE_NOT_OPER; |
1190 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c CH |
1191 | ccw_device_unregister(cdev); |
1192 | put_device(&cdev->dev); | |
1da177e4 LT |
1193 | return 0; |
1194 | } | |
1195 | ||
1196 | static int | |
1197 | io_subchannel_notify(struct device *dev, int event) | |
1198 | { | |
1199 | struct ccw_device *cdev; | |
1200 | ||
1201 | cdev = dev->driver_data; | |
1202 | if (!cdev) | |
1203 | return 0; | |
1204 | if (!cdev->drv) | |
1205 | return 0; | |
1206 | if (!cdev->online) | |
1207 | return 0; | |
1208 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; | |
1209 | } | |
1210 | ||
1211 | static void | |
1212 | io_subchannel_verify(struct device *dev) | |
1213 | { | |
1214 | struct ccw_device *cdev; | |
1215 | ||
1216 | cdev = dev->driver_data; | |
1217 | if (cdev) | |
1218 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1219 | } | |
1220 | ||
1221 | static void | |
1222 | io_subchannel_ioterm(struct device *dev) | |
1223 | { | |
1224 | struct ccw_device *cdev; | |
1225 | ||
1226 | cdev = dev->driver_data; | |
1227 | if (!cdev) | |
1228 | return; | |
d23861ff CH |
1229 | /* Internal I/O will be retried by the interrupt handler. */ |
1230 | if (cdev->private->flags.intretry) | |
1231 | return; | |
1da177e4 LT |
1232 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
1233 | if (cdev->handler) | |
1234 | cdev->handler(cdev, cdev->private->intparm, | |
1235 | ERR_PTR(-EIO)); | |
1236 | } | |
1237 | ||
1238 | static void | |
8bbace7e | 1239 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1240 | { |
1da177e4 LT |
1241 | struct ccw_device *cdev; |
1242 | int ret; | |
1243 | ||
8bbace7e | 1244 | cdev = sch->dev.driver_data; |
1da177e4 | 1245 | |
a8237fc4 | 1246 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1247 | return; |
1248 | if (!sch->schib.pmcw.ena) | |
1249 | /* Nothing to do. */ | |
1250 | return; | |
1251 | ret = cio_disable_subchannel(sch); | |
1252 | if (ret != -EBUSY) | |
1253 | /* Subchannel is disabled, we're done. */ | |
1254 | return; | |
1255 | cdev->private->state = DEV_STATE_QUIESCE; | |
1256 | if (cdev->handler) | |
1257 | cdev->handler(cdev, cdev->private->intparm, | |
1258 | ERR_PTR(-EIO)); | |
1259 | ret = ccw_device_cancel_halt_clear(cdev); | |
1260 | if (ret == -EBUSY) { | |
1261 | ccw_device_set_timeout(cdev, HZ/10); | |
1262 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1263 | } | |
1264 | cio_disable_subchannel(sch); | |
1265 | } | |
1266 | ||
1267 | #ifdef CONFIG_CCW_CONSOLE | |
1268 | static struct ccw_device console_cdev; | |
1269 | static struct ccw_device_private console_private; | |
1270 | static int console_cdev_in_use; | |
1271 | ||
2ec22984 CH |
1272 | static DEFINE_SPINLOCK(ccw_console_lock); |
1273 | ||
1274 | spinlock_t * cio_get_console_lock(void) | |
1275 | { | |
1276 | return &ccw_console_lock; | |
1277 | } | |
1278 | ||
1da177e4 LT |
1279 | static int |
1280 | ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch) | |
1281 | { | |
1282 | int rc; | |
1283 | ||
1284 | /* Initialize the ccw_device structure. */ | |
292888c8 | 1285 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1286 | rc = io_subchannel_recog(cdev, sch); |
1287 | if (rc) | |
1288 | return rc; | |
1289 | ||
1290 | /* Now wait for the async. recognition to come to an end. */ | |
1291 | spin_lock_irq(cdev->ccwlock); | |
1292 | while (!dev_fsm_final_state(cdev)) | |
1293 | wait_cons_dev(); | |
1294 | rc = -EIO; | |
1295 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1296 | goto out_unlock; | |
1297 | ccw_device_online(cdev); | |
1298 | while (!dev_fsm_final_state(cdev)) | |
1299 | wait_cons_dev(); | |
1300 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1301 | goto out_unlock; | |
1302 | rc = 0; | |
1303 | out_unlock: | |
1304 | spin_unlock_irq(cdev->ccwlock); | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | struct ccw_device * | |
1309 | ccw_device_probe_console(void) | |
1310 | { | |
1311 | struct subchannel *sch; | |
1312 | int ret; | |
1313 | ||
1314 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1315 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1316 | sch = cio_probe_console(); |
1317 | if (IS_ERR(sch)) { | |
1318 | console_cdev_in_use = 0; | |
1319 | return (void *) sch; | |
1320 | } | |
1321 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1322 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1323 | console_cdev.private = &console_private; | |
c1637532 | 1324 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1325 | ret = ccw_device_console_enable(&console_cdev, sch); |
1326 | if (ret) { | |
1327 | cio_release_console(); | |
1328 | console_cdev_in_use = 0; | |
1329 | return ERR_PTR(ret); | |
1330 | } | |
1331 | console_cdev.online = 1; | |
1332 | return &console_cdev; | |
1333 | } | |
1334 | #endif | |
1335 | ||
1336 | /* | |
1337 | * get ccw_device matching the busid, but only if owned by cdrv | |
1338 | */ | |
b0744bd2 CH |
1339 | static int |
1340 | __ccwdev_check_busid(struct device *dev, void *id) | |
1341 | { | |
1342 | char *bus_id; | |
1343 | ||
12975aef | 1344 | bus_id = id; |
b0744bd2 CH |
1345 | |
1346 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); | |
1347 | } | |
1348 | ||
1349 | ||
b2ffd8e9 CH |
1350 | /** |
1351 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1352 | * @cdrv: driver the device is owned by | |
1353 | * @bus_id: bus id of the device to be searched | |
1354 | * | |
1355 | * This function searches all devices owned by @cdrv for a device with a bus | |
1356 | * id matching @bus_id. | |
1357 | * Returns: | |
1358 | * If a match is found, its reference count of the found device is increased | |
1359 | * and it is returned; else %NULL is returned. | |
1360 | */ | |
1361 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1362 | const char *bus_id) | |
1da177e4 | 1363 | { |
b0744bd2 | 1364 | struct device *dev; |
1da177e4 LT |
1365 | struct device_driver *drv; |
1366 | ||
1367 | drv = get_driver(&cdrv->driver); | |
1368 | if (!drv) | |
b0744bd2 | 1369 | return NULL; |
1da177e4 | 1370 | |
b0744bd2 CH |
1371 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1372 | __ccwdev_check_busid); | |
1da177e4 LT |
1373 | put_driver(drv); |
1374 | ||
d2c993d8 | 1375 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1376 | } |
1377 | ||
1378 | /************************** device driver handling ************************/ | |
1379 | ||
1380 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1381 | * and release methods are initially very similar to the device_driver | |
1382 | * implementations, with the difference that they have ccw_device | |
1383 | * arguments. | |
1384 | * | |
1385 | * A ccw driver also contains the information that is needed for | |
1386 | * device matching. | |
1387 | */ | |
1388 | static int | |
1389 | ccw_device_probe (struct device *dev) | |
1390 | { | |
1391 | struct ccw_device *cdev = to_ccwdev(dev); | |
1392 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1393 | int ret; | |
1394 | ||
1395 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1396 | ||
1397 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1398 | ||
1399 | if (ret) { | |
d2c993d8 | 1400 | cdev->drv = NULL; |
1da177e4 LT |
1401 | return ret; |
1402 | } | |
1403 | ||
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | static int | |
1408 | ccw_device_remove (struct device *dev) | |
1409 | { | |
1410 | struct ccw_device *cdev = to_ccwdev(dev); | |
1411 | struct ccw_driver *cdrv = cdev->drv; | |
1412 | int ret; | |
1413 | ||
1da177e4 LT |
1414 | if (cdrv->remove) |
1415 | cdrv->remove(cdev); | |
1416 | if (cdev->online) { | |
1417 | cdev->online = 0; | |
1418 | spin_lock_irq(cdev->ccwlock); | |
1419 | ret = ccw_device_offline(cdev); | |
1420 | spin_unlock_irq(cdev->ccwlock); | |
1421 | if (ret == 0) | |
1422 | wait_event(cdev->private->wait_q, | |
1423 | dev_fsm_final_state(cdev)); | |
1424 | else | |
1425 | //FIXME: we can't fail! | |
e556bbbd CH |
1426 | CIO_MSG_EVENT(2, "ccw_device_offline returned %d, " |
1427 | "device 0.%x.%04x\n", | |
1428 | ret, cdev->private->dev_id.ssid, | |
1429 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1430 | } |
1431 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1432 | cdev->drv = NULL; |
1da177e4 LT |
1433 | return 0; |
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, | |
1442 | }; | |
1443 | ||
b2ffd8e9 CH |
1444 | /** |
1445 | * ccw_driver_register() - register a ccw driver | |
1446 | * @cdriver: driver to be registered | |
1447 | * | |
1448 | * This function is mainly a wrapper around driver_register(). | |
1449 | * Returns: | |
1450 | * %0 on success and a negative error value on failure. | |
1451 | */ | |
1452 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1453 | { |
1454 | struct device_driver *drv = &cdriver->driver; | |
1455 | ||
1456 | drv->bus = &ccw_bus_type; | |
1457 | drv->name = cdriver->name; | |
1da177e4 LT |
1458 | |
1459 | return driver_register(drv); | |
1460 | } | |
1461 | ||
b2ffd8e9 CH |
1462 | /** |
1463 | * ccw_driver_unregister() - deregister a ccw driver | |
1464 | * @cdriver: driver to be deregistered | |
1465 | * | |
1466 | * This function is mainly a wrapper around driver_unregister(). | |
1467 | */ | |
1468 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1469 | { |
1470 | driver_unregister(&cdriver->driver); | |
1471 | } | |
1472 | ||
a8237fc4 CH |
1473 | /* Helper func for qdio. */ |
1474 | struct subchannel_id | |
1475 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1476 | { | |
1477 | struct subchannel *sch; | |
1478 | ||
1479 | sch = to_subchannel(cdev->dev.parent); | |
1480 | return sch->schid; | |
1481 | } | |
1482 | ||
1da177e4 LT |
1483 | MODULE_LICENSE("GPL"); |
1484 | EXPORT_SYMBOL(ccw_device_set_online); | |
1485 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1486 | EXPORT_SYMBOL(ccw_driver_register); | |
1487 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1488 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1489 | EXPORT_SYMBOL(ccw_bus_type); | |
1490 | EXPORT_SYMBOL(ccw_device_work); | |
1491 | EXPORT_SYMBOL(ccw_device_notify_work); | |
a8237fc4 | 1492 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |