Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
1da177e4 | 4 | * |
c820de39 | 5 | * Copyright IBM Corp. 2002,2008 |
1da177e4 | 6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
4ce3b30c | 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
9 | */ | |
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/init.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/workqueue.h> | |
90ab1336 | 19 | #include <linux/timer.h> |
1da177e4 LT |
20 | |
21 | #include <asm/ccwdev.h> | |
22 | #include <asm/cio.h> | |
4e57b681 | 23 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 24 | #include <asm/cmb.h> |
3a3fc29a | 25 | #include <asm/isc.h> |
1da177e4 | 26 | |
0ae7a7b2 | 27 | #include "chp.h" |
1da177e4 | 28 | #include "cio.h" |
d7b5a4c9 | 29 | #include "cio_debug.h" |
1da177e4 LT |
30 | #include "css.h" |
31 | #include "device.h" | |
32 | #include "ioasm.h" | |
cd6b4f27 | 33 | #include "io_sch.h" |
ecf5d9ef | 34 | #include "blacklist.h" |
1da177e4 | 35 | |
90ab1336 | 36 | static struct timer_list recovery_timer; |
486d0a00 | 37 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
38 | static int recovery_phase; |
39 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
40 | ||
1da177e4 LT |
41 | /******************* bus type handling ***********************/ |
42 | ||
43 | /* The Linux driver model distinguishes between a bus type and | |
44 | * the bus itself. Of course we only have one channel | |
45 | * subsystem driver and one channel system per machine, but | |
46 | * we still use the abstraction. T.R. says it's a good idea. */ | |
47 | static int | |
48 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
49 | { | |
50 | struct ccw_device *cdev = to_ccwdev(dev); | |
51 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
52 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
53 | ||
54 | if (!ids) | |
55 | return 0; | |
56 | ||
57 | found = ccw_device_id_match(ids, &cdev->id); | |
58 | if (!found) | |
59 | return 0; | |
60 | ||
61 | cdev->id.driver_info = found->driver_info; | |
62 | ||
63 | return 1; | |
64 | } | |
65 | ||
db0c2d59 PO |
66 | /* Store modalias string delimited by prefix/suffix string into buffer with |
67 | * specified size. Return length of resulting string (excluding trailing '\0') | |
68 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 69 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 70 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 71 | { |
db0c2d59 | 72 | int len; |
1da177e4 | 73 | |
cfbe9bb2 | 74 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
75 | if (len > size) |
76 | return len; | |
77 | buf += len; | |
78 | size -= len; | |
1da177e4 | 79 | |
db0c2d59 PO |
80 | if (id->dev_type != 0) |
81 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
82 | id->dev_model, suffix); | |
83 | else | |
84 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 85 | |
db0c2d59 PO |
86 | return len; |
87 | } | |
88 | ||
89 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
90 | * non-zero otherwise. */ | |
7eff2e7a | 91 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
92 | { |
93 | struct ccw_device *cdev = to_ccwdev(dev); | |
94 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
95 | int ret; |
96 | char modalias_buf[30]; | |
1da177e4 | 97 | |
db0c2d59 | 98 | /* CU_TYPE= */ |
7eff2e7a | 99 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
100 | if (ret) |
101 | return ret; | |
db0c2d59 PO |
102 | |
103 | /* CU_MODEL= */ | |
7eff2e7a | 104 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
105 | if (ret) |
106 | return ret; | |
1da177e4 LT |
107 | |
108 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 109 | /* DEV_TYPE= */ |
7eff2e7a | 110 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
111 | if (ret) |
112 | return ret; | |
1da177e4 | 113 | |
db0c2d59 | 114 | /* DEV_MODEL= */ |
7eff2e7a | 115 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
116 | if (ret) |
117 | return ret; | |
db0c2d59 PO |
118 | |
119 | /* MODALIAS= */ | |
cfbe9bb2 | 120 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
121 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
122 | return ret; | |
1da177e4 LT |
123 | } |
124 | ||
8bbace7e | 125 | struct bus_type ccw_bus_type; |
1da177e4 | 126 | |
602b20f2 CH |
127 | static void io_subchannel_irq(struct subchannel *); |
128 | static int io_subchannel_probe(struct subchannel *); | |
129 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 130 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 131 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
132 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
133 | int); | |
8ea7f559 SO |
134 | static void recovery_func(unsigned long data); |
135 | struct workqueue_struct *ccw_device_work; | |
136 | wait_queue_head_t ccw_device_init_wq; | |
137 | atomic_t ccw_device_init_count; | |
1da177e4 | 138 | |
f08adc00 CH |
139 | static struct css_device_id io_subchannel_ids[] = { |
140 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
141 | { /* end of list */ }, | |
142 | }; | |
143 | MODULE_DEVICE_TABLE(css, io_subchannel_ids); | |
144 | ||
93a27592 CH |
145 | static int io_subchannel_prepare(struct subchannel *sch) |
146 | { | |
147 | struct ccw_device *cdev; | |
148 | /* | |
149 | * Don't allow suspend while a ccw device registration | |
150 | * is still outstanding. | |
151 | */ | |
152 | cdev = sch_get_cdev(sch); | |
153 | if (cdev && !device_is_registered(&cdev->dev)) | |
154 | return -EAGAIN; | |
155 | return 0; | |
156 | } | |
157 | ||
8ea7f559 SO |
158 | static void io_subchannel_settle(void) |
159 | { | |
160 | wait_event(ccw_device_init_wq, | |
161 | atomic_read(&ccw_device_init_count) == 0); | |
162 | flush_workqueue(ccw_device_work); | |
163 | } | |
164 | ||
f7e5d67c | 165 | static struct css_driver io_subchannel_driver = { |
4beee646 | 166 | .owner = THIS_MODULE, |
f08adc00 | 167 | .subchannel_type = io_subchannel_ids, |
25b7bb58 | 168 | .name = "io_subchannel", |
1da177e4 | 169 | .irq = io_subchannel_irq, |
c820de39 CH |
170 | .sch_event = io_subchannel_sch_event, |
171 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
172 | .probe = io_subchannel_probe, |
173 | .remove = io_subchannel_remove, | |
174 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 175 | .prepare = io_subchannel_prepare, |
8ea7f559 | 176 | .settle = io_subchannel_settle, |
1da177e4 LT |
177 | }; |
178 | ||
2f17644d | 179 | int __init io_subchannel_init(void) |
1da177e4 LT |
180 | { |
181 | int ret; | |
182 | ||
183 | init_waitqueue_head(&ccw_device_init_wq); | |
184 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 185 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 LT |
186 | |
187 | ccw_device_work = create_singlethread_workqueue("cio"); | |
188 | if (!ccw_device_work) | |
2f17644d | 189 | return -ENOMEM; |
1da177e4 LT |
190 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); |
191 | if (!slow_path_wq) { | |
2f17644d | 192 | ret = -ENOMEM; |
1da177e4 LT |
193 | goto out_err; |
194 | } | |
195 | if ((ret = bus_register (&ccw_bus_type))) | |
196 | goto out_err; | |
197 | ||
25b7bb58 CH |
198 | ret = css_driver_register(&io_subchannel_driver); |
199 | if (ret) | |
1da177e4 LT |
200 | goto out_err; |
201 | ||
1da177e4 LT |
202 | return 0; |
203 | out_err: | |
204 | if (ccw_device_work) | |
205 | destroy_workqueue(ccw_device_work); | |
1da177e4 LT |
206 | if (slow_path_wq) |
207 | destroy_workqueue(slow_path_wq); | |
208 | return ret; | |
209 | } | |
210 | ||
1da177e4 LT |
211 | |
212 | /************************ device handling **************************/ | |
213 | ||
214 | /* | |
215 | * A ccw_device has some interfaces in sysfs in addition to the | |
216 | * standard ones. | |
217 | * The following entries are designed to export the information which | |
218 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
219 | * are obvious, so they don't have an entry :) | |
220 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
221 | */ | |
222 | static ssize_t | |
3fd3c0a5 | 223 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
224 | { |
225 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 226 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
227 | ssize_t ret = 0; |
228 | int chp; | |
7ad6a249 PO |
229 | int mask; |
230 | ||
231 | for (chp = 0; chp < 8; chp++) { | |
232 | mask = 0x80 >> chp; | |
233 | if (ssd->path_mask & mask) | |
234 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
235 | else | |
236 | ret += sprintf(buf + ret, "00 "); | |
237 | } | |
1da177e4 LT |
238 | ret += sprintf (buf+ret, "\n"); |
239 | return min((ssize_t)PAGE_SIZE, ret); | |
240 | } | |
241 | ||
242 | static ssize_t | |
3fd3c0a5 | 243 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
244 | { |
245 | struct subchannel *sch = to_subchannel(dev); | |
246 | struct pmcw *pmcw = &sch->schib.pmcw; | |
247 | ||
248 | return sprintf (buf, "%02x %02x %02x\n", | |
249 | pmcw->pim, pmcw->pam, pmcw->pom); | |
250 | } | |
251 | ||
252 | static ssize_t | |
3fd3c0a5 | 253 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
254 | { |
255 | struct ccw_device *cdev = to_ccwdev(dev); | |
256 | struct ccw_device_id *id = &(cdev->id); | |
257 | ||
258 | if (id->dev_type != 0) | |
259 | return sprintf(buf, "%04x/%02x\n", | |
260 | id->dev_type, id->dev_model); | |
261 | else | |
262 | return sprintf(buf, "n/a\n"); | |
263 | } | |
264 | ||
265 | static ssize_t | |
3fd3c0a5 | 266 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
267 | { |
268 | struct ccw_device *cdev = to_ccwdev(dev); | |
269 | struct ccw_device_id *id = &(cdev->id); | |
270 | ||
271 | return sprintf(buf, "%04x/%02x\n", | |
272 | id->cu_type, id->cu_model); | |
273 | } | |
274 | ||
f1fc78a8 BB |
275 | static ssize_t |
276 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
277 | { | |
278 | struct ccw_device *cdev = to_ccwdev(dev); | |
279 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 280 | int len; |
f1fc78a8 | 281 | |
086a6c62 | 282 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
283 | |
284 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
285 | } |
286 | ||
1da177e4 | 287 | static ssize_t |
3fd3c0a5 | 288 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
289 | { |
290 | struct ccw_device *cdev = to_ccwdev(dev); | |
291 | ||
292 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
293 | } | |
294 | ||
d7b5a4c9 CH |
295 | int ccw_device_is_orphan(struct ccw_device *cdev) |
296 | { | |
297 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
298 | } | |
299 | ||
ef99516c | 300 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 301 | { |
3b554a14 | 302 | if (test_and_clear_bit(1, &cdev->private->registered)) { |
ef99516c | 303 | device_del(&cdev->dev); |
3b554a14 SO |
304 | /* Release reference from device_initialize(). */ |
305 | put_device(&cdev->dev); | |
306 | } | |
7674da77 CH |
307 | } |
308 | ||
46fbe4e4 | 309 | static void ccw_device_remove_orphan_cb(struct work_struct *work) |
59a8a6e2 | 310 | { |
46fbe4e4 PO |
311 | struct ccw_device_private *priv; |
312 | struct ccw_device *cdev; | |
59a8a6e2 | 313 | |
46fbe4e4 PO |
314 | priv = container_of(work, struct ccw_device_private, kick_work); |
315 | cdev = priv->cdev; | |
59a8a6e2 | 316 | ccw_device_unregister(cdev); |
46fbe4e4 PO |
317 | /* Release cdev reference for workqueue processing. */ |
318 | put_device(&cdev->dev); | |
59a8a6e2 CH |
319 | } |
320 | ||
1da177e4 LT |
321 | static void |
322 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
323 | { | |
d7b5a4c9 | 324 | unsigned long flags; |
59a8a6e2 | 325 | |
1da177e4 LT |
326 | /* |
327 | * Forced offline in disconnected state means | |
328 | * 'throw away device'. | |
329 | */ | |
d7b5a4c9 | 330 | if (ccw_device_is_orphan(cdev)) { |
59a8a6e2 CH |
331 | /* |
332 | * Deregister ccw device. | |
333 | * Unfortunately, we cannot do this directly from the | |
334 | * attribute method. | |
335 | */ | |
be7a2ddc SO |
336 | /* Get cdev reference for workqueue processing. */ |
337 | if (!get_device(&cdev->dev)) | |
338 | return; | |
d7b5a4c9 CH |
339 | spin_lock_irqsave(cdev->ccwlock, flags); |
340 | cdev->private->state = DEV_STATE_NOT_OPER; | |
341 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
46fbe4e4 PO |
342 | PREPARE_WORK(&cdev->private->kick_work, |
343 | ccw_device_remove_orphan_cb); | |
c4621a62 | 344 | queue_work(slow_path_wq, &cdev->private->kick_work); |
46fbe4e4 PO |
345 | } else |
346 | /* Deregister subchannel, which will kill the ccw device. */ | |
c4621a62 | 347 | ccw_device_schedule_sch_unregister(cdev); |
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); | |
217ee6c6 ME |
377 | /* Wait until a final state or DISCONNECTED is reached */ |
378 | while (!dev_fsm_final_state(cdev) && | |
379 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 380 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
381 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
382 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
383 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 384 | } |
217ee6c6 ME |
385 | ret = ccw_device_offline(cdev); |
386 | if (ret) | |
387 | goto error; | |
1da177e4 | 388 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
389 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
390 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
391 | /* Give up reference from ccw_device_set_online(). */ | |
392 | put_device(&cdev->dev); | |
393 | return 0; | |
394 | ||
395 | error: | |
396 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n", | |
397 | ret, cdev->private->dev_id.ssid, | |
398 | cdev->private->dev_id.devno); | |
399 | cdev->private->state = DEV_STATE_OFFLINE; | |
400 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
401 | spin_unlock_irq(cdev->ccwlock); | |
402 | /* Give up reference from ccw_device_set_online(). */ | |
403 | put_device(&cdev->dev); | |
404 | return -ENODEV; | |
1da177e4 LT |
405 | } |
406 | ||
b2ffd8e9 CH |
407 | /** |
408 | * ccw_device_set_online() - enable a ccw device for I/O | |
409 | * @cdev: target ccw device | |
410 | * | |
411 | * This function first enables @cdev and then calls the driver's set_online() | |
412 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
413 | * disabled again. | |
414 | * Returns: | |
415 | * %0 on success and a negative error value on failure. | |
416 | * Context: | |
417 | * enabled, ccw device lock not held | |
418 | */ | |
419 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
420 | { |
421 | int ret; | |
217ee6c6 | 422 | int ret2; |
1da177e4 LT |
423 | |
424 | if (!cdev) | |
425 | return -ENODEV; | |
426 | if (cdev->online || !cdev->drv) | |
427 | return -EINVAL; | |
9cd67421 CH |
428 | /* Hold on to an extra reference while device is online. */ |
429 | if (!get_device(&cdev->dev)) | |
430 | return -ENODEV; | |
1da177e4 LT |
431 | |
432 | spin_lock_irq(cdev->ccwlock); | |
433 | ret = ccw_device_online(cdev); | |
434 | spin_unlock_irq(cdev->ccwlock); | |
435 | if (ret == 0) | |
436 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
437 | else { | |
139b83dd | 438 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
439 | "device 0.%x.%04x\n", |
440 | ret, cdev->private->dev_id.ssid, | |
441 | cdev->private->dev_id.devno); | |
9cd67421 CH |
442 | /* Give up online reference since onlining failed. */ |
443 | put_device(&cdev->dev); | |
1da177e4 LT |
444 | return ret; |
445 | } | |
217ee6c6 ME |
446 | spin_lock_irq(cdev->ccwlock); |
447 | /* Check if online processing was successful */ | |
448 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
449 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
450 | spin_unlock_irq(cdev->ccwlock); | |
9cd67421 CH |
451 | /* Give up online reference since onlining failed. */ |
452 | put_device(&cdev->dev); | |
1da177e4 | 453 | return -ENODEV; |
9cd67421 | 454 | } |
217ee6c6 ME |
455 | spin_unlock_irq(cdev->ccwlock); |
456 | if (cdev->drv->set_online) | |
457 | ret = cdev->drv->set_online(cdev); | |
458 | if (ret) | |
459 | goto rollback; | |
460 | cdev->online = 1; | |
461 | return 0; | |
462 | ||
463 | rollback: | |
1da177e4 | 464 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
465 | /* Wait until a final state or DISCONNECTED is reached */ |
466 | while (!dev_fsm_final_state(cdev) && | |
467 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
468 | spin_unlock_irq(cdev->ccwlock); | |
469 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
470 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
471 | spin_lock_irq(cdev->ccwlock); | |
472 | } | |
473 | ret2 = ccw_device_offline(cdev); | |
474 | if (ret2) | |
475 | goto error; | |
476 | spin_unlock_irq(cdev->ccwlock); | |
477 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
478 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
479 | /* Give up online reference since onlining failed. */ | |
480 | put_device(&cdev->dev); | |
481 | return ret; | |
482 | ||
483 | error: | |
484 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
485 | "device 0.%x.%04x\n", | |
486 | ret2, cdev->private->dev_id.ssid, | |
487 | cdev->private->dev_id.devno); | |
488 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 489 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
490 | /* Give up online reference since onlining failed. */ |
491 | put_device(&cdev->dev); | |
217ee6c6 | 492 | return ret; |
1da177e4 LT |
493 | } |
494 | ||
e74fe0ce | 495 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 CH |
496 | { |
497 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
498 | ccw_device_remove_disconnected(cdev); | |
e74fe0ce SO |
499 | else if (cdev->online && cdev->drv && cdev->drv->set_offline) |
500 | return ccw_device_set_offline(cdev); | |
501 | return 0; | |
f5ba6c86 CH |
502 | } |
503 | ||
504 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
505 | { | |
506 | int ret; | |
507 | ||
508 | /* Do device recognition, if needed. */ | |
99f6a570 | 509 | if (cdev->private->state == DEV_STATE_BOXED) { |
f5ba6c86 CH |
510 | ret = ccw_device_recognition(cdev); |
511 | if (ret) { | |
e556bbbd CH |
512 | CIO_MSG_EVENT(0, "Couldn't start recognition " |
513 | "for device 0.%x.%04x (ret=%d)\n", | |
514 | cdev->private->dev_id.ssid, | |
515 | cdev->private->dev_id.devno, ret); | |
f5ba6c86 CH |
516 | return ret; |
517 | } | |
518 | wait_event(cdev->private->wait_q, | |
519 | cdev->private->flags.recog_done); | |
156013ff SO |
520 | if (cdev->private->state != DEV_STATE_OFFLINE) |
521 | /* recognition failed */ | |
522 | return -EAGAIN; | |
f5ba6c86 CH |
523 | } |
524 | if (cdev->drv && cdev->drv->set_online) | |
525 | ccw_device_set_online(cdev); | |
526 | return 0; | |
527 | } | |
156013ff | 528 | |
c78aa6cb | 529 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
530 | { |
531 | int ret; | |
532 | ||
533 | ret = online_store_recog_and_online(cdev); | |
156013ff | 534 | if (ret && !force) |
c78aa6cb | 535 | return ret; |
f5ba6c86 CH |
536 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
537 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
538 | if (ret) |
539 | return ret; | |
f5ba6c86 CH |
540 | if (cdev->id.cu_type == 0) |
541 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
542 | ret = online_store_recog_and_online(cdev); |
543 | if (ret) | |
544 | return ret; | |
f5ba6c86 | 545 | } |
c78aa6cb | 546 | return 0; |
f5ba6c86 CH |
547 | } |
548 | ||
549 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
550 | const char *buf, size_t count) | |
1da177e4 LT |
551 | { |
552 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
553 | int force, ret; |
554 | unsigned long i; | |
1da177e4 | 555 | |
b5cd99e6 SO |
556 | if ((cdev->private->state != DEV_STATE_OFFLINE && |
557 | cdev->private->state != DEV_STATE_ONLINE && | |
558 | cdev->private->state != DEV_STATE_BOXED && | |
559 | cdev->private->state != DEV_STATE_DISCONNECTED) || | |
560 | atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) | |
1da177e4 LT |
561 | return -EAGAIN; |
562 | ||
563 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
564 | atomic_set(&cdev->private->onoff, 0); | |
565 | return -EINVAL; | |
566 | } | |
567 | if (!strncmp(buf, "force\n", count)) { | |
568 | force = 1; | |
569 | i = 1; | |
2f972202 | 570 | ret = 0; |
1da177e4 LT |
571 | } else { |
572 | force = 0; | |
2f972202 | 573 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 574 | } |
2f972202 CH |
575 | if (ret) |
576 | goto out; | |
f5ba6c86 CH |
577 | switch (i) { |
578 | case 0: | |
e74fe0ce | 579 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
580 | break; |
581 | case 1: | |
c78aa6cb | 582 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
583 | break; |
584 | default: | |
2f972202 | 585 | ret = -EINVAL; |
1da177e4 | 586 | } |
2f972202 | 587 | out: |
1da177e4 LT |
588 | if (cdev->drv) |
589 | module_put(cdev->drv->owner); | |
590 | atomic_set(&cdev->private->onoff, 0); | |
e74fe0ce | 591 | return (ret < 0) ? ret : count; |
1da177e4 LT |
592 | } |
593 | ||
594 | static ssize_t | |
3fd3c0a5 | 595 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
596 | { |
597 | struct ccw_device *cdev = to_ccwdev(dev); | |
598 | struct subchannel *sch; | |
599 | ||
d7b5a4c9 CH |
600 | if (ccw_device_is_orphan(cdev)) |
601 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
602 | switch (cdev->private->state) { |
603 | case DEV_STATE_BOXED: | |
604 | return sprintf(buf, "boxed\n"); | |
605 | case DEV_STATE_DISCONNECTED: | |
606 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
607 | case DEV_STATE_NOT_OPER: | |
608 | sch = to_subchannel(dev->parent); | |
609 | if (!sch->lpm) | |
610 | return sprintf(buf, "no path\n"); | |
611 | else | |
612 | return sprintf(buf, "no device\n"); | |
613 | default: | |
614 | /* All other states considered fine. */ | |
615 | return sprintf(buf, "good\n"); | |
616 | } | |
617 | } | |
618 | ||
619 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
620 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
621 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
622 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 623 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 624 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
625 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
626 | ||
7e9db9ea | 627 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
628 | &dev_attr_chpids.attr, |
629 | &dev_attr_pimpampom.attr, | |
630 | NULL, | |
631 | }; | |
632 | ||
7e9db9ea CH |
633 | static struct attribute_group io_subchannel_attr_group = { |
634 | .attrs = io_subchannel_attrs, | |
529192f3 | 635 | }; |
1da177e4 LT |
636 | |
637 | static struct attribute * ccwdev_attrs[] = { | |
638 | &dev_attr_devtype.attr, | |
639 | &dev_attr_cutype.attr, | |
f1fc78a8 | 640 | &dev_attr_modalias.attr, |
1da177e4 LT |
641 | &dev_attr_online.attr, |
642 | &dev_attr_cmb_enable.attr, | |
643 | &dev_attr_availability.attr, | |
644 | NULL, | |
645 | }; | |
646 | ||
647 | static struct attribute_group ccwdev_attr_group = { | |
648 | .attrs = ccwdev_attrs, | |
649 | }; | |
650 | ||
a4dbd674 | 651 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
652 | &ccwdev_attr_group, |
653 | NULL, | |
654 | }; | |
1da177e4 LT |
655 | |
656 | /* this is a simple abstraction for device_register that sets the | |
657 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 658 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
659 | { |
660 | struct device *dev = &cdev->dev; | |
661 | int ret; | |
662 | ||
663 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
664 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
665 | cdev->private->dev_id.devno); | |
666 | if (ret) | |
667 | return ret; | |
668 | ret = device_add(dev); | |
669 | if (ret) | |
1da177e4 LT |
670 | return ret; |
671 | ||
672 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
673 | return ret; |
674 | } | |
675 | ||
5d6e6b6f | 676 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 677 | { |
5d6e6b6f PO |
678 | struct ccw_device *cdev = to_ccwdev(dev); |
679 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 680 | |
d7b5a4c9 CH |
681 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
682 | } | |
683 | ||
5d6e6b6f | 684 | static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) |
d7b5a4c9 CH |
685 | { |
686 | struct device *dev; | |
687 | ||
5d6e6b6f | 688 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
689 | |
690 | return dev ? to_ccwdev(dev) : NULL; | |
691 | } | |
692 | ||
eb32ae8d | 693 | void ccw_device_do_unbind_bind(struct work_struct *work) |
1da177e4 | 694 | { |
c1637532 | 695 | struct ccw_device_private *priv; |
1da177e4 LT |
696 | struct ccw_device *cdev; |
697 | struct subchannel *sch; | |
eb32ae8d | 698 | int ret; |
1da177e4 | 699 | |
c1637532 MS |
700 | priv = container_of(work, struct ccw_device_private, kick_work); |
701 | cdev = priv->cdev; | |
1da177e4 | 702 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 703 | |
eb32ae8d CH |
704 | if (test_bit(1, &cdev->private->registered)) { |
705 | device_release_driver(&cdev->dev); | |
706 | ret = device_attach(&cdev->dev); | |
707 | WARN_ON(ret == -ENODEV); | |
708 | } | |
1da177e4 LT |
709 | } |
710 | ||
711 | static void | |
712 | ccw_device_release(struct device *dev) | |
713 | { | |
714 | struct ccw_device *cdev; | |
715 | ||
716 | cdev = to_ccwdev(dev); | |
6eff208f CH |
717 | /* Release reference of parent subchannel. */ |
718 | put_device(cdev->dev.parent); | |
1da177e4 LT |
719 | kfree(cdev->private); |
720 | kfree(cdev); | |
721 | } | |
722 | ||
7674da77 CH |
723 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
724 | { | |
725 | struct ccw_device *cdev; | |
726 | ||
727 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
728 | if (cdev) { | |
729 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
730 | GFP_KERNEL | GFP_DMA); | |
731 | if (cdev->private) | |
732 | return cdev; | |
733 | } | |
734 | kfree(cdev); | |
735 | return ERR_PTR(-ENOMEM); | |
736 | } | |
737 | ||
738 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
739 | struct ccw_device *cdev) | |
740 | { | |
741 | cdev->private->cdev = cdev; | |
742 | atomic_set(&cdev->private->onoff, 0); | |
743 | cdev->dev.parent = &sch->dev; | |
744 | cdev->dev.release = ccw_device_release; | |
33583c36 | 745 | INIT_WORK(&cdev->private->kick_work, NULL); |
ef99516c | 746 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
747 | /* Do first half of device_register. */ |
748 | device_initialize(&cdev->dev); | |
749 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
750 | /* Release reference from device_initialize(). */ |
751 | put_device(&cdev->dev); | |
7674da77 CH |
752 | return -ENODEV; |
753 | } | |
754 | return 0; | |
755 | } | |
756 | ||
757 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
758 | { | |
759 | struct ccw_device *cdev; | |
760 | int ret; | |
761 | ||
762 | cdev = io_subchannel_allocate_dev(sch); | |
763 | if (!IS_ERR(cdev)) { | |
764 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 765 | if (ret) |
7674da77 | 766 | cdev = ERR_PTR(ret); |
7674da77 CH |
767 | } |
768 | return cdev; | |
769 | } | |
770 | ||
d7b5a4c9 CH |
771 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
772 | ||
d7b5a4c9 CH |
773 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
774 | { | |
775 | struct ccw_device *cdev; | |
776 | ||
777 | /* Need to allocate a new ccw device. */ | |
778 | cdev = io_subchannel_create_ccwdev(sch); | |
779 | if (IS_ERR(cdev)) { | |
780 | /* OK, we did everything we could... */ | |
781 | css_sch_device_unregister(sch); | |
782 | return; | |
783 | } | |
d7b5a4c9 CH |
784 | /* Start recognition for the new ccw device. */ |
785 | if (io_subchannel_recog(cdev, sch)) { | |
786 | spin_lock_irq(sch->lock); | |
db6a6423 | 787 | sch_set_cdev(sch, NULL); |
d7b5a4c9 | 788 | spin_unlock_irq(sch->lock); |
d7b5a4c9 | 789 | css_sch_device_unregister(sch); |
6eff208f CH |
790 | /* Put reference from io_subchannel_create_ccwdev(). */ |
791 | put_device(&sch->dev); | |
792 | /* Give up initial reference. */ | |
793 | put_device(&cdev->dev); | |
d7b5a4c9 CH |
794 | } |
795 | } | |
796 | ||
1da177e4 LT |
797 | /* |
798 | * Register recognized device. | |
799 | */ | |
800 | static void | |
c1637532 | 801 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 802 | { |
c1637532 | 803 | struct ccw_device_private *priv; |
1da177e4 LT |
804 | struct ccw_device *cdev; |
805 | struct subchannel *sch; | |
806 | int ret; | |
807 | unsigned long flags; | |
808 | ||
c1637532 MS |
809 | priv = container_of(work, struct ccw_device_private, kick_work); |
810 | cdev = priv->cdev; | |
1da177e4 | 811 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
812 | /* |
813 | * Check if subchannel is still registered. It may have become | |
814 | * unregistered if a machine check hit us after finishing | |
815 | * device recognition but before the register work could be | |
816 | * queued. | |
817 | */ | |
818 | if (!device_is_registered(&sch->dev)) | |
819 | goto out_err; | |
82b7ac05 | 820 | css_update_ssd_info(sch); |
47af5518 CH |
821 | /* |
822 | * io_subchannel_register() will also be called after device | |
823 | * recognition has been done for a boxed device (which will already | |
824 | * be registered). We need to reprobe since we may now have sense id | |
825 | * information. | |
826 | */ | |
d6a30761 | 827 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
828 | if (!cdev->drv) { |
829 | ret = device_reprobe(&cdev->dev); | |
830 | if (ret) | |
831 | /* We can't do much here. */ | |
139b83dd | 832 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
833 | " %d for 0.%x.%04x\n", ret, |
834 | cdev->private->dev_id.ssid, | |
835 | cdev->private->dev_id.devno); | |
47af5518 | 836 | } |
1da177e4 LT |
837 | goto out; |
838 | } | |
fa1a8c23 CH |
839 | /* |
840 | * Now we know this subchannel will stay, we can throw | |
841 | * our delayed uevent. | |
842 | */ | |
f67f129e | 843 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 844 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
845 | /* make it known to the system */ |
846 | ret = ccw_device_register(cdev); | |
847 | if (ret) { | |
e556bbbd CH |
848 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
849 | cdev->private->dev_id.ssid, | |
850 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 851 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 852 | sch_set_cdev(sch, NULL); |
2ec22984 | 853 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
854 | /* Release initial device reference. */ |
855 | put_device(&cdev->dev); | |
5fb6b854 | 856 | goto out_err; |
1da177e4 | 857 | } |
1da177e4 LT |
858 | out: |
859 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 860 | wake_up(&cdev->private->wait_q); |
5fb6b854 CH |
861 | out_err: |
862 | /* Release reference for workqueue processing. */ | |
863 | put_device(&cdev->dev); | |
1da177e4 LT |
864 | if (atomic_dec_and_test(&ccw_device_init_count)) |
865 | wake_up(&ccw_device_init_wq); | |
866 | } | |
867 | ||
3f4cf6e7 | 868 | static void ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 869 | { |
c1637532 MS |
870 | struct ccw_device_private *priv; |
871 | struct ccw_device *cdev; | |
1da177e4 LT |
872 | struct subchannel *sch; |
873 | ||
c1637532 MS |
874 | priv = container_of(work, struct ccw_device_private, kick_work); |
875 | cdev = priv->cdev; | |
46fbe4e4 PO |
876 | /* Get subchannel reference for local processing. */ |
877 | if (!get_device(cdev->dev.parent)) | |
878 | return; | |
1da177e4 | 879 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 880 | css_sch_device_unregister(sch); |
46fbe4e4 | 881 | /* Release cdev reference for workqueue processing.*/ |
1da177e4 | 882 | put_device(&cdev->dev); |
46fbe4e4 | 883 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
884 | put_device(&sch->dev); |
885 | } | |
886 | ||
c4621a62 SO |
887 | void ccw_device_schedule_sch_unregister(struct ccw_device *cdev) |
888 | { | |
be7a2ddc SO |
889 | /* Get cdev reference for workqueue processing. */ |
890 | if (!get_device(&cdev->dev)) | |
891 | return; | |
c4621a62 SO |
892 | PREPARE_WORK(&cdev->private->kick_work, |
893 | ccw_device_call_sch_unregister); | |
894 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
895 | } | |
896 | ||
1da177e4 LT |
897 | /* |
898 | * subchannel recognition done. Called from the state machine. | |
899 | */ | |
900 | void | |
901 | io_subchannel_recog_done(struct ccw_device *cdev) | |
902 | { | |
1da177e4 LT |
903 | if (css_init_done == 0) { |
904 | cdev->private->flags.recog_done = 1; | |
905 | return; | |
906 | } | |
907 | switch (cdev->private->state) { | |
47593bfa SO |
908 | case DEV_STATE_BOXED: |
909 | /* Device did not respond in time. */ | |
1da177e4 LT |
910 | case DEV_STATE_NOT_OPER: |
911 | cdev->private->flags.recog_done = 1; | |
c4621a62 | 912 | ccw_device_schedule_sch_unregister(cdev); |
1da177e4 LT |
913 | if (atomic_dec_and_test(&ccw_device_init_count)) |
914 | wake_up(&ccw_device_init_wq); | |
915 | break; | |
1da177e4 LT |
916 | case DEV_STATE_OFFLINE: |
917 | /* | |
918 | * We can't register the device in interrupt context so | |
919 | * we schedule a work item. | |
920 | */ | |
921 | if (!get_device(&cdev->dev)) | |
922 | break; | |
923 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 924 | io_subchannel_register); |
1da177e4 LT |
925 | queue_work(slow_path_wq, &cdev->private->kick_work); |
926 | break; | |
927 | } | |
928 | } | |
929 | ||
930 | static int | |
931 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
932 | { | |
933 | int rc; | |
934 | struct ccw_device_private *priv; | |
935 | ||
2ec22984 | 936 | cdev->ccwlock = sch->lock; |
fb6958a5 | 937 | |
1da177e4 LT |
938 | /* Init private data. */ |
939 | priv = cdev->private; | |
78964268 CH |
940 | priv->dev_id.devno = sch->schib.pmcw.dev; |
941 | priv->dev_id.ssid = sch->schid.ssid; | |
942 | priv->schid = sch->schid; | |
1da177e4 LT |
943 | priv->state = DEV_STATE_NOT_OPER; |
944 | INIT_LIST_HEAD(&priv->cmb_list); | |
945 | init_waitqueue_head(&priv->wait_q); | |
946 | init_timer(&priv->timer); | |
947 | ||
1da177e4 LT |
948 | /* Increase counter of devices currently in recognition. */ |
949 | atomic_inc(&ccw_device_init_count); | |
950 | ||
951 | /* Start async. device sensing. */ | |
2ec22984 | 952 | spin_lock_irq(sch->lock); |
60e4dac1 | 953 | sch_set_cdev(sch, cdev); |
1da177e4 | 954 | rc = ccw_device_recognition(cdev); |
2ec22984 | 955 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
956 | if (rc) { |
957 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
958 | wake_up(&ccw_device_init_wq); | |
959 | } | |
960 | return rc; | |
961 | } | |
962 | ||
5d6e6b6f PO |
963 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
964 | struct subchannel *sch) | |
d7b5a4c9 | 965 | { |
5d6e6b6f | 966 | struct subchannel *old_sch; |
d7b5a4c9 | 967 | int rc; |
d7b5a4c9 | 968 | |
5d6e6b6f PO |
969 | old_sch = to_subchannel(cdev->dev.parent); |
970 | /* Obtain child reference for new parent. */ | |
6eff208f | 971 | if (!get_device(&sch->dev)) |
5d6e6b6f | 972 | return -ENODEV; |
d7b5a4c9 | 973 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 974 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
975 | mutex_unlock(&sch->reg_mutex); |
976 | if (rc) { | |
5d6e6b6f | 977 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
978 | cdev->private->dev_id.ssid, |
979 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f PO |
980 | sch->schib.pmcw.dev, rc); |
981 | /* Release child reference for new parent. */ | |
6eff208f | 982 | put_device(&sch->dev); |
5d6e6b6f | 983 | return rc; |
d7b5a4c9 | 984 | } |
5d6e6b6f PO |
985 | /* Clean up old subchannel. */ |
986 | if (!sch_is_pseudo_sch(old_sch)) { | |
987 | spin_lock_irq(old_sch->lock); | |
988 | sch_set_cdev(old_sch, NULL); | |
989 | cio_disable_subchannel(old_sch); | |
990 | spin_unlock_irq(old_sch->lock); | |
991 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 992 | } |
5d6e6b6f PO |
993 | /* Release child reference for old parent. */ |
994 | put_device(&old_sch->dev); | |
995 | /* Initialize new subchannel. */ | |
996 | spin_lock_irq(sch->lock); | |
997 | cdev->private->schid = sch->schid; | |
998 | cdev->ccwlock = sch->lock; | |
999 | if (!sch_is_pseudo_sch(sch)) | |
1000 | sch_set_cdev(sch, cdev); | |
1001 | spin_unlock_irq(sch->lock); | |
1002 | if (!sch_is_pseudo_sch(sch)) | |
1003 | css_update_ssd_info(sch); | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
1008 | { | |
1009 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1010 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
1011 | ||
1012 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
1013 | } |
1014 | ||
602b20f2 CH |
1015 | static void io_subchannel_irq(struct subchannel *sch) |
1016 | { | |
1017 | struct ccw_device *cdev; | |
1018 | ||
db6a6423 | 1019 | cdev = sch_get_cdev(sch); |
602b20f2 | 1020 | |
efd986db SO |
1021 | CIO_TRACE_EVENT(6, "IRQ"); |
1022 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
1023 | if (cdev) |
1024 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1025 | } | |
1026 | ||
13952ec1 SO |
1027 | void io_subchannel_init_config(struct subchannel *sch) |
1028 | { | |
1029 | memset(&sch->config, 0, sizeof(sch->config)); | |
1030 | sch->config.csense = 1; | |
d36f0c66 SO |
1031 | /* Use subchannel mp mode when there is more than 1 installed CHPID. */ |
1032 | if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0) | |
13952ec1 SO |
1033 | sch->config.mp = 1; |
1034 | } | |
1035 | ||
0ae7a7b2 CH |
1036 | static void io_subchannel_init_fields(struct subchannel *sch) |
1037 | { | |
1038 | if (cio_is_console(sch->schid)) | |
1039 | sch->opm = 0xff; | |
1040 | else | |
1041 | sch->opm = chp_get_sch_opm(sch); | |
1042 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1043 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1044 | |
1045 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1046 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1047 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1048 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1049 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1050 | |
1051 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1052 | } |
1053 | ||
90ed2b69 CH |
1054 | static void io_subchannel_do_unreg(struct work_struct *work) |
1055 | { | |
1056 | struct subchannel *sch; | |
1057 | ||
1058 | sch = container_of(work, struct subchannel, work); | |
1059 | css_sch_device_unregister(sch); | |
90ed2b69 CH |
1060 | put_device(&sch->dev); |
1061 | } | |
1062 | ||
1063 | /* Schedule unregister if we have no cdev. */ | |
1064 | static void io_subchannel_schedule_removal(struct subchannel *sch) | |
1065 | { | |
1066 | get_device(&sch->dev); | |
1067 | INIT_WORK(&sch->work, io_subchannel_do_unreg); | |
1068 | queue_work(slow_path_wq, &sch->work); | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * Note: We always return 0 so that we bind to the device even on error. | |
1073 | * This is needed so that our remove function is called on unregister. | |
1074 | */ | |
0ae7a7b2 | 1075 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1076 | { |
1da177e4 LT |
1077 | struct ccw_device *cdev; |
1078 | int rc; | |
1da177e4 | 1079 | |
6d7c5afc | 1080 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1081 | rc = sysfs_create_group(&sch->dev.kobj, |
1082 | &io_subchannel_attr_group); | |
1083 | if (rc) | |
1084 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1085 | "attributes for subchannel " | |
1086 | "0.%x.%04x (rc=%d)\n", | |
1087 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1088 | /* |
6d7c5afc | 1089 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1090 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1091 | * the ccw_device and exit. |
1da177e4 | 1092 | */ |
f67f129e | 1093 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1094 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1095 | cdev = sch_get_cdev(sch); |
e1031786 | 1096 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1097 | device_initialize(&cdev->dev); |
1098 | ccw_device_register(cdev); | |
1da177e4 LT |
1099 | /* |
1100 | * Check if the device is already online. If it is | |
9cd67421 CH |
1101 | * the reference count needs to be corrected since we |
1102 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1103 | */ |
1104 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1105 | cdev->private->state != DEV_STATE_OFFLINE && | |
1106 | cdev->private->state != DEV_STATE_BOXED) | |
1107 | get_device(&cdev->dev); | |
1108 | return 0; | |
1109 | } | |
0ae7a7b2 | 1110 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1111 | rc = cio_commit_config(sch); |
1112 | if (rc) | |
1113 | goto out_schedule; | |
7e9db9ea CH |
1114 | rc = sysfs_create_group(&sch->dev.kobj, |
1115 | &io_subchannel_attr_group); | |
1116 | if (rc) | |
90ed2b69 | 1117 | goto out_schedule; |
cd6b4f27 CH |
1118 | /* Allocate I/O subchannel private data. */ |
1119 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1120 | GFP_KERNEL | GFP_DMA); | |
90ed2b69 | 1121 | if (!sch->private) |
48e4c385 | 1122 | goto out_schedule; |
5d6e6b6f | 1123 | css_schedule_eval(sch->schid); |
7e9db9ea | 1124 | return 0; |
48e4c385 | 1125 | |
90ed2b69 CH |
1126 | out_schedule: |
1127 | io_subchannel_schedule_removal(sch); | |
1128 | return 0; | |
1da177e4 LT |
1129 | } |
1130 | ||
1da177e4 | 1131 | static int |
8bbace7e | 1132 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1133 | { |
1134 | struct ccw_device *cdev; | |
1135 | unsigned long flags; | |
1136 | ||
db6a6423 CH |
1137 | cdev = sch_get_cdev(sch); |
1138 | if (!cdev) | |
48e4c385 | 1139 | goto out_free; |
1da177e4 LT |
1140 | /* Set ccw device to not operational and drop reference. */ |
1141 | spin_lock_irqsave(cdev->ccwlock, flags); | |
db6a6423 | 1142 | sch_set_cdev(sch, NULL); |
1da177e4 LT |
1143 | cdev->private->state = DEV_STATE_NOT_OPER; |
1144 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c | 1145 | ccw_device_unregister(cdev); |
48e4c385 | 1146 | out_free: |
cd6b4f27 | 1147 | kfree(sch->private); |
7e9db9ea | 1148 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1149 | return 0; |
1150 | } | |
1151 | ||
602b20f2 | 1152 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1153 | { |
1154 | struct ccw_device *cdev; | |
1155 | ||
db6a6423 | 1156 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1157 | if (cdev) |
1158 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1159 | } | |
1160 | ||
c820de39 | 1161 | static int check_for_io_on_path(struct subchannel *sch, int mask) |
1da177e4 | 1162 | { |
cdb912a4 | 1163 | if (cio_update_schib(sch)) |
c820de39 | 1164 | return 0; |
23d805b6 | 1165 | if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask) |
c820de39 CH |
1166 | return 1; |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static void terminate_internal_io(struct subchannel *sch, | |
1171 | struct ccw_device *cdev) | |
1172 | { | |
1173 | if (cio_clear(sch)) { | |
1174 | /* Recheck device in case clear failed. */ | |
1175 | sch->lpm = 0; | |
1176 | if (cdev->online) | |
1177 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1178 | else | |
1179 | css_schedule_eval(sch->schid); | |
d23861ff | 1180 | return; |
c820de39 | 1181 | } |
1da177e4 | 1182 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
c820de39 CH |
1183 | /* Request retry of internal operation. */ |
1184 | cdev->private->flags.intretry = 1; | |
1185 | /* Call handler. */ | |
1da177e4 LT |
1186 | if (cdev->handler) |
1187 | cdev->handler(cdev, cdev->private->intparm, | |
1188 | ERR_PTR(-EIO)); | |
1189 | } | |
1190 | ||
c820de39 CH |
1191 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1192 | { | |
1193 | struct ccw_device *cdev; | |
1194 | ||
1195 | cdev = sch_get_cdev(sch); | |
1196 | if (!cdev) | |
1197 | return; | |
1198 | if (check_for_io_on_path(sch, mask)) { | |
1199 | if (cdev->private->state == DEV_STATE_ONLINE) | |
1200 | ccw_device_kill_io(cdev); | |
1201 | else { | |
1202 | terminate_internal_io(sch, cdev); | |
1203 | /* Re-start path verification. */ | |
1204 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1205 | } | |
1206 | } else | |
1207 | /* trigger path verification. */ | |
1208 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1209 | ||
1210 | } | |
1211 | ||
99611f87 CH |
1212 | static int io_subchannel_chp_event(struct subchannel *sch, |
1213 | struct chp_link *link, int event) | |
c820de39 CH |
1214 | { |
1215 | int mask; | |
c820de39 | 1216 | |
99611f87 | 1217 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1218 | if (!mask) |
1219 | return 0; | |
1220 | switch (event) { | |
1221 | case CHP_VARY_OFF: | |
1222 | sch->opm &= ~mask; | |
1223 | sch->lpm &= ~mask; | |
1224 | io_subchannel_terminate_path(sch, mask); | |
1225 | break; | |
1226 | case CHP_VARY_ON: | |
1227 | sch->opm |= mask; | |
1228 | sch->lpm |= mask; | |
1229 | io_subchannel_verify(sch); | |
1230 | break; | |
1231 | case CHP_OFFLINE: | |
cdb912a4 | 1232 | if (cio_update_schib(sch)) |
c820de39 CH |
1233 | return -ENODEV; |
1234 | io_subchannel_terminate_path(sch, mask); | |
1235 | break; | |
1236 | case CHP_ONLINE: | |
cdb912a4 SO |
1237 | if (cio_update_schib(sch)) |
1238 | return -ENODEV; | |
c820de39 CH |
1239 | sch->lpm |= mask & sch->opm; |
1240 | io_subchannel_verify(sch); | |
1241 | break; | |
1242 | } | |
1243 | return 0; | |
1244 | } | |
1245 | ||
1da177e4 | 1246 | static void |
8bbace7e | 1247 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1248 | { |
1da177e4 LT |
1249 | struct ccw_device *cdev; |
1250 | int ret; | |
1251 | ||
db6a6423 | 1252 | cdev = sch_get_cdev(sch); |
1da177e4 | 1253 | |
a8237fc4 | 1254 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1255 | return; |
1256 | if (!sch->schib.pmcw.ena) | |
1257 | /* Nothing to do. */ | |
1258 | return; | |
1259 | ret = cio_disable_subchannel(sch); | |
1260 | if (ret != -EBUSY) | |
1261 | /* Subchannel is disabled, we're done. */ | |
1262 | return; | |
1263 | cdev->private->state = DEV_STATE_QUIESCE; | |
1264 | if (cdev->handler) | |
1265 | cdev->handler(cdev, cdev->private->intparm, | |
1266 | ERR_PTR(-EIO)); | |
1267 | ret = ccw_device_cancel_halt_clear(cdev); | |
1268 | if (ret == -EBUSY) { | |
1269 | ccw_device_set_timeout(cdev, HZ/10); | |
1270 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1271 | } | |
1272 | cio_disable_subchannel(sch); | |
1273 | } | |
1274 | ||
c820de39 CH |
1275 | static int device_is_disconnected(struct ccw_device *cdev) |
1276 | { | |
1277 | if (!cdev) | |
1278 | return 0; | |
1279 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1280 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1281 | } | |
1282 | ||
1283 | static int recovery_check(struct device *dev, void *data) | |
1284 | { | |
1285 | struct ccw_device *cdev = to_ccwdev(dev); | |
1286 | int *redo = data; | |
1287 | ||
1288 | spin_lock_irq(cdev->ccwlock); | |
1289 | switch (cdev->private->state) { | |
1290 | case DEV_STATE_DISCONNECTED: | |
1291 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1292 | cdev->private->dev_id.ssid, | |
1293 | cdev->private->dev_id.devno); | |
1294 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1295 | *redo = 1; | |
1296 | break; | |
1297 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1298 | *redo = 1; | |
1299 | break; | |
1300 | } | |
1301 | spin_unlock_irq(cdev->ccwlock); | |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | static void recovery_work_func(struct work_struct *unused) | |
1307 | { | |
1308 | int redo = 0; | |
1309 | ||
1310 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1311 | if (redo) { | |
1312 | spin_lock_irq(&recovery_lock); | |
1313 | if (!timer_pending(&recovery_timer)) { | |
1314 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1315 | recovery_phase++; | |
1316 | mod_timer(&recovery_timer, jiffies + | |
1317 | recovery_delay[recovery_phase] * HZ); | |
1318 | } | |
1319 | spin_unlock_irq(&recovery_lock); | |
1320 | } else | |
1321 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1322 | } | |
1323 | ||
1324 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1325 | ||
1326 | static void recovery_func(unsigned long data) | |
1327 | { | |
1328 | /* | |
1329 | * We can't do our recovery in softirq context and it's not | |
1330 | * performance critical, so we schedule it. | |
1331 | */ | |
1332 | schedule_work(&recovery_work); | |
1333 | } | |
1334 | ||
1335 | static void ccw_device_schedule_recovery(void) | |
1336 | { | |
1337 | unsigned long flags; | |
1338 | ||
1339 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1340 | spin_lock_irqsave(&recovery_lock, flags); | |
1341 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1342 | recovery_phase = 0; | |
1343 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1344 | } | |
1345 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1346 | } | |
1347 | ||
ecf5d9ef PO |
1348 | static int purge_fn(struct device *dev, void *data) |
1349 | { | |
1350 | struct ccw_device *cdev = to_ccwdev(dev); | |
1351 | struct ccw_device_private *priv = cdev->private; | |
1352 | int unreg; | |
1353 | ||
1354 | spin_lock_irq(cdev->ccwlock); | |
1355 | unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) && | |
1356 | (priv->state == DEV_STATE_OFFLINE); | |
1357 | spin_unlock_irq(cdev->ccwlock); | |
1358 | if (!unreg) | |
1359 | goto out; | |
ecf5d9ef PO |
1360 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid, |
1361 | priv->dev_id.devno); | |
c4621a62 | 1362 | ccw_device_schedule_sch_unregister(cdev); |
ecf5d9ef PO |
1363 | |
1364 | out: | |
1365 | /* Abort loop in case of pending signal. */ | |
1366 | if (signal_pending(current)) | |
1367 | return -EINTR; | |
1368 | ||
1369 | return 0; | |
1370 | } | |
1371 | ||
1372 | /** | |
1373 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1374 | * | |
1375 | * Unregister all ccw devices that are offline and on the blacklist. | |
1376 | */ | |
1377 | int ccw_purge_blacklisted(void) | |
1378 | { | |
1379 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1380 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1381 | return 0; | |
1382 | } | |
1383 | ||
6afcc775 | 1384 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1385 | { |
1386 | if (!cdev) | |
1387 | return; | |
1388 | ccw_device_set_timeout(cdev, 0); | |
1389 | cdev->private->flags.fake_irb = 0; | |
1390 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1391 | if (cdev->online) | |
1392 | ccw_device_schedule_recovery(); | |
1393 | } | |
1394 | ||
91c36919 PO |
1395 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1396 | { | |
1397 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1398 | ||
1399 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1400 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1401 | ccw_device_set_timeout(cdev, 0); |
1402 | cio_disable_subchannel(sch); | |
1403 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1404 | } | |
1405 | ||
5d6e6b6f PO |
1406 | enum io_sch_action { |
1407 | IO_SCH_UNREG, | |
1408 | IO_SCH_ORPH_UNREG, | |
1409 | IO_SCH_ATTACH, | |
1410 | IO_SCH_UNREG_ATTACH, | |
1411 | IO_SCH_ORPH_ATTACH, | |
1412 | IO_SCH_REPROBE, | |
1413 | IO_SCH_VERIFY, | |
1414 | IO_SCH_DISC, | |
1415 | IO_SCH_NOP, | |
1416 | }; | |
1417 | ||
1418 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1419 | { | |
1420 | struct ccw_device *cdev; | |
1421 | ||
1422 | cdev = sch_get_cdev(sch); | |
1423 | if (cio_update_schib(sch)) { | |
1424 | /* Not operational. */ | |
1425 | if (!cdev) | |
1426 | return IO_SCH_UNREG; | |
1427 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
1428 | return IO_SCH_UNREG; | |
1429 | return IO_SCH_ORPH_UNREG; | |
1430 | } | |
1431 | /* Operational. */ | |
1432 | if (!cdev) | |
1433 | return IO_SCH_ATTACH; | |
1434 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1435 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
1436 | return IO_SCH_UNREG_ATTACH; | |
1437 | return IO_SCH_ORPH_ATTACH; | |
1438 | } | |
1439 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
1440 | if (!ccw_device_notify(cdev, CIO_NO_PATH)) | |
1441 | return IO_SCH_UNREG; | |
1442 | return IO_SCH_DISC; | |
1443 | } | |
1444 | if (device_is_disconnected(cdev)) | |
1445 | return IO_SCH_REPROBE; | |
1446 | if (cdev->online) | |
1447 | return IO_SCH_VERIFY; | |
1448 | return IO_SCH_NOP; | |
1449 | } | |
1450 | ||
1451 | /** | |
1452 | * io_subchannel_sch_event - process subchannel event | |
1453 | * @sch: subchannel | |
1454 | * @process: non-zero if function is called in process context | |
1455 | * | |
1456 | * An unspecified event occurred for this subchannel. Adjust data according | |
1457 | * to the current operational state of the subchannel and device. Return | |
1458 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1459 | * function should be called again in process context. | |
1460 | */ | |
1461 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1462 | { |
c820de39 | 1463 | unsigned long flags; |
c820de39 | 1464 | struct ccw_device *cdev; |
5d6e6b6f PO |
1465 | struct ccw_dev_id dev_id; |
1466 | enum io_sch_action action; | |
1467 | int rc = -EAGAIN; | |
c820de39 CH |
1468 | |
1469 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1470 | if (!device_is_registered(&sch->dev)) |
1471 | goto out_unlock; | |
1472 | action = sch_get_action(sch); | |
1473 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1474 | sch->schid.ssid, sch->schid.sch_no, process, | |
1475 | action); | |
1476 | /* Perform immediate actions while holding the lock. */ | |
c820de39 | 1477 | cdev = sch_get_cdev(sch); |
5d6e6b6f PO |
1478 | switch (action) { |
1479 | case IO_SCH_REPROBE: | |
1480 | /* Trigger device recognition. */ | |
1481 | ccw_device_trigger_reprobe(cdev); | |
1482 | rc = 0; | |
1483 | goto out_unlock; | |
1484 | case IO_SCH_VERIFY: | |
1485 | /* Trigger path verification. */ | |
1486 | io_subchannel_verify(sch); | |
1487 | rc = 0; | |
1488 | goto out_unlock; | |
1489 | case IO_SCH_DISC: | |
1490 | ccw_device_set_disconnected(cdev); | |
1491 | rc = 0; | |
1492 | goto out_unlock; | |
1493 | case IO_SCH_ORPH_UNREG: | |
1494 | case IO_SCH_ORPH_ATTACH: | |
1495 | ccw_device_set_disconnected(cdev); | |
1496 | break; | |
1497 | case IO_SCH_UNREG_ATTACH: | |
1498 | case IO_SCH_UNREG: | |
1499 | if (cdev) | |
1500 | ccw_device_set_notoper(cdev); | |
1501 | break; | |
1502 | case IO_SCH_NOP: | |
1503 | rc = 0; | |
1504 | goto out_unlock; | |
1505 | default: | |
1506 | break; | |
c820de39 | 1507 | } |
5d6e6b6f PO |
1508 | spin_unlock_irqrestore(sch->lock, flags); |
1509 | /* All other actions require process context. */ | |
1510 | if (!process) | |
1511 | goto out; | |
1512 | /* Handle attached ccw device. */ | |
1513 | switch (action) { | |
1514 | case IO_SCH_ORPH_UNREG: | |
1515 | case IO_SCH_ORPH_ATTACH: | |
1516 | /* Move ccw device to orphanage. */ | |
1517 | rc = ccw_device_move_to_orph(cdev); | |
1518 | if (rc) | |
1519 | goto out; | |
c820de39 | 1520 | break; |
5d6e6b6f PO |
1521 | case IO_SCH_UNREG_ATTACH: |
1522 | /* Unregister ccw device. */ | |
1523 | ccw_device_unregister(cdev); | |
c820de39 | 1524 | break; |
5d6e6b6f | 1525 | default: |
c820de39 CH |
1526 | break; |
1527 | } | |
5d6e6b6f | 1528 | /* Handle subchannel. */ |
c820de39 | 1529 | switch (action) { |
5d6e6b6f PO |
1530 | case IO_SCH_ORPH_UNREG: |
1531 | case IO_SCH_UNREG: | |
c820de39 | 1532 | css_sch_device_unregister(sch); |
c820de39 | 1533 | break; |
5d6e6b6f PO |
1534 | case IO_SCH_ORPH_ATTACH: |
1535 | case IO_SCH_UNREG_ATTACH: | |
1536 | case IO_SCH_ATTACH: | |
1537 | dev_id.ssid = sch->schid.ssid; | |
1538 | dev_id.devno = sch->schib.pmcw.dev; | |
1539 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1540 | if (!cdev) { | |
1541 | sch_create_and_recog_new_device(sch); | |
1542 | break; | |
1543 | } | |
1544 | rc = ccw_device_move_to_sch(cdev, sch); | |
1545 | if (rc) { | |
1546 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1547 | put_device(&cdev->dev); | |
1548 | goto out; | |
1549 | } | |
1550 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1551 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1552 | spin_unlock_irqrestore(sch->lock, flags); |
1553 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1554 | put_device(&cdev->dev); | |
91c36919 | 1555 | break; |
c820de39 CH |
1556 | default: |
1557 | break; | |
1558 | } | |
5d6e6b6f | 1559 | return 0; |
c820de39 | 1560 | |
5d6e6b6f PO |
1561 | out_unlock: |
1562 | spin_unlock_irqrestore(sch->lock, flags); | |
1563 | out: | |
1564 | return rc; | |
c820de39 CH |
1565 | } |
1566 | ||
1da177e4 LT |
1567 | #ifdef CONFIG_CCW_CONSOLE |
1568 | static struct ccw_device console_cdev; | |
1569 | static struct ccw_device_private console_private; | |
1570 | static int console_cdev_in_use; | |
1571 | ||
2ec22984 CH |
1572 | static DEFINE_SPINLOCK(ccw_console_lock); |
1573 | ||
1574 | spinlock_t * cio_get_console_lock(void) | |
1575 | { | |
1576 | return &ccw_console_lock; | |
1577 | } | |
1578 | ||
0ae7a7b2 CH |
1579 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1580 | struct subchannel *sch) | |
1da177e4 LT |
1581 | { |
1582 | int rc; | |
1583 | ||
cd6b4f27 CH |
1584 | /* Attach subchannel private data. */ |
1585 | sch->private = cio_get_console_priv(); | |
1586 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 | 1587 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1588 | rc = cio_commit_config(sch); |
1589 | if (rc) | |
1590 | return rc; | |
0ae7a7b2 | 1591 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1592 | /* Initialize the ccw_device structure. */ |
292888c8 | 1593 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1594 | rc = io_subchannel_recog(cdev, sch); |
1595 | if (rc) | |
1596 | return rc; | |
1597 | ||
1598 | /* Now wait for the async. recognition to come to an end. */ | |
1599 | spin_lock_irq(cdev->ccwlock); | |
1600 | while (!dev_fsm_final_state(cdev)) | |
1601 | wait_cons_dev(); | |
1602 | rc = -EIO; | |
1603 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1604 | goto out_unlock; | |
1605 | ccw_device_online(cdev); | |
1606 | while (!dev_fsm_final_state(cdev)) | |
1607 | wait_cons_dev(); | |
1608 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1609 | goto out_unlock; | |
1610 | rc = 0; | |
1611 | out_unlock: | |
1612 | spin_unlock_irq(cdev->ccwlock); | |
1613 | return 0; | |
1614 | } | |
1615 | ||
1616 | struct ccw_device * | |
1617 | ccw_device_probe_console(void) | |
1618 | { | |
1619 | struct subchannel *sch; | |
1620 | int ret; | |
1621 | ||
1622 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1623 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1624 | sch = cio_probe_console(); |
1625 | if (IS_ERR(sch)) { | |
1626 | console_cdev_in_use = 0; | |
1627 | return (void *) sch; | |
1628 | } | |
1629 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1630 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1631 | console_cdev.private = &console_private; | |
c1637532 | 1632 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1633 | ret = ccw_device_console_enable(&console_cdev, sch); |
1634 | if (ret) { | |
1635 | cio_release_console(); | |
1636 | console_cdev_in_use = 0; | |
1637 | return ERR_PTR(ret); | |
1638 | } | |
1639 | console_cdev.online = 1; | |
1640 | return &console_cdev; | |
1641 | } | |
1f4e7eda | 1642 | |
6664845c MS |
1643 | static int ccw_device_pm_restore(struct device *dev); |
1644 | ||
1645 | int ccw_device_force_console(void) | |
1646 | { | |
1647 | if (!console_cdev_in_use) | |
1648 | return -ENODEV; | |
1649 | return ccw_device_pm_restore(&console_cdev.dev); | |
1650 | } | |
1651 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1652 | #endif |
1653 | ||
1654 | /* | |
1655 | * get ccw_device matching the busid, but only if owned by cdrv | |
1656 | */ | |
b0744bd2 CH |
1657 | static int |
1658 | __ccwdev_check_busid(struct device *dev, void *id) | |
1659 | { | |
1660 | char *bus_id; | |
1661 | ||
12975aef | 1662 | bus_id = id; |
b0744bd2 | 1663 | |
98df67b3 | 1664 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1665 | } |
1666 | ||
1667 | ||
b2ffd8e9 CH |
1668 | /** |
1669 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1670 | * @cdrv: driver the device is owned by | |
1671 | * @bus_id: bus id of the device to be searched | |
1672 | * | |
1673 | * This function searches all devices owned by @cdrv for a device with a bus | |
1674 | * id matching @bus_id. | |
1675 | * Returns: | |
1676 | * If a match is found, its reference count of the found device is increased | |
1677 | * and it is returned; else %NULL is returned. | |
1678 | */ | |
1679 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1680 | const char *bus_id) | |
1da177e4 | 1681 | { |
b0744bd2 | 1682 | struct device *dev; |
1da177e4 LT |
1683 | struct device_driver *drv; |
1684 | ||
1685 | drv = get_driver(&cdrv->driver); | |
1686 | if (!drv) | |
b0744bd2 | 1687 | return NULL; |
1da177e4 | 1688 | |
b0744bd2 CH |
1689 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1690 | __ccwdev_check_busid); | |
1da177e4 LT |
1691 | put_driver(drv); |
1692 | ||
d2c993d8 | 1693 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1694 | } |
1695 | ||
1696 | /************************** device driver handling ************************/ | |
1697 | ||
1698 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1699 | * and release methods are initially very similar to the device_driver | |
1700 | * implementations, with the difference that they have ccw_device | |
1701 | * arguments. | |
1702 | * | |
1703 | * A ccw driver also contains the information that is needed for | |
1704 | * device matching. | |
1705 | */ | |
1706 | static int | |
1707 | ccw_device_probe (struct device *dev) | |
1708 | { | |
1709 | struct ccw_device *cdev = to_ccwdev(dev); | |
1710 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1711 | int ret; | |
1712 | ||
1713 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1714 | ||
1715 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1716 | ||
1717 | if (ret) { | |
d2c993d8 | 1718 | cdev->drv = NULL; |
1da177e4 LT |
1719 | return ret; |
1720 | } | |
1721 | ||
1722 | return 0; | |
1723 | } | |
1724 | ||
1725 | static int | |
1726 | ccw_device_remove (struct device *dev) | |
1727 | { | |
1728 | struct ccw_device *cdev = to_ccwdev(dev); | |
1729 | struct ccw_driver *cdrv = cdev->drv; | |
1730 | int ret; | |
1731 | ||
1da177e4 LT |
1732 | if (cdrv->remove) |
1733 | cdrv->remove(cdev); | |
1734 | if (cdev->online) { | |
1735 | cdev->online = 0; | |
1736 | spin_lock_irq(cdev->ccwlock); | |
1737 | ret = ccw_device_offline(cdev); | |
1738 | spin_unlock_irq(cdev->ccwlock); | |
1739 | if (ret == 0) | |
1740 | wait_event(cdev->private->wait_q, | |
1741 | dev_fsm_final_state(cdev)); | |
1742 | else | |
139b83dd | 1743 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1744 | "device 0.%x.%04x\n", |
1745 | ret, cdev->private->dev_id.ssid, | |
1746 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1747 | /* Give up reference obtained in ccw_device_set_online(). */ |
1748 | put_device(&cdev->dev); | |
1da177e4 LT |
1749 | } |
1750 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1751 | cdev->drv = NULL; |
1da177e4 LT |
1752 | return 0; |
1753 | } | |
1754 | ||
958974fb CH |
1755 | static void ccw_device_shutdown(struct device *dev) |
1756 | { | |
1757 | struct ccw_device *cdev; | |
1758 | ||
1759 | cdev = to_ccwdev(dev); | |
1760 | if (cdev->drv && cdev->drv->shutdown) | |
1761 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1762 | disable_cmf(cdev); |
958974fb CH |
1763 | } |
1764 | ||
823d494a SO |
1765 | static int ccw_device_pm_prepare(struct device *dev) |
1766 | { | |
1767 | struct ccw_device *cdev = to_ccwdev(dev); | |
1768 | ||
1769 | if (work_pending(&cdev->private->kick_work)) | |
1770 | return -EAGAIN; | |
1771 | /* Fail while device is being set online/offline. */ | |
1772 | if (atomic_read(&cdev->private->onoff)) | |
1773 | return -EAGAIN; | |
1774 | ||
1775 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1776 | return cdev->drv->prepare(cdev); | |
1777 | ||
1778 | return 0; | |
1779 | } | |
1780 | ||
1781 | static void ccw_device_pm_complete(struct device *dev) | |
1782 | { | |
1783 | struct ccw_device *cdev = to_ccwdev(dev); | |
1784 | ||
1785 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1786 | cdev->drv->complete(cdev); | |
1787 | } | |
1788 | ||
1789 | static int ccw_device_pm_freeze(struct device *dev) | |
1790 | { | |
1791 | struct ccw_device *cdev = to_ccwdev(dev); | |
1792 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1793 | int ret, cm_enabled; | |
1794 | ||
1795 | /* Fail suspend while device is in transistional state. */ | |
1796 | if (!dev_fsm_final_state(cdev)) | |
1797 | return -EAGAIN; | |
1798 | if (!cdev->online) | |
1799 | return 0; | |
1800 | if (cdev->drv && cdev->drv->freeze) { | |
1801 | ret = cdev->drv->freeze(cdev); | |
1802 | if (ret) | |
1803 | return ret; | |
1804 | } | |
1805 | ||
1806 | spin_lock_irq(sch->lock); | |
1807 | cm_enabled = cdev->private->cmb != NULL; | |
1808 | spin_unlock_irq(sch->lock); | |
1809 | if (cm_enabled) { | |
1810 | /* Don't have the css write on memory. */ | |
1811 | ret = ccw_set_cmf(cdev, 0); | |
1812 | if (ret) | |
1813 | return ret; | |
1814 | } | |
1815 | /* From here on, disallow device driver I/O. */ | |
1816 | spin_lock_irq(sch->lock); | |
1817 | ret = cio_disable_subchannel(sch); | |
1818 | spin_unlock_irq(sch->lock); | |
1819 | ||
1820 | return ret; | |
1821 | } | |
1822 | ||
1823 | static int ccw_device_pm_thaw(struct device *dev) | |
1824 | { | |
1825 | struct ccw_device *cdev = to_ccwdev(dev); | |
1826 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1827 | int ret, cm_enabled; | |
1828 | ||
1829 | if (!cdev->online) | |
1830 | return 0; | |
1831 | ||
1832 | spin_lock_irq(sch->lock); | |
1833 | /* Allow device driver I/O again. */ | |
1834 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1835 | cm_enabled = cdev->private->cmb != NULL; | |
1836 | spin_unlock_irq(sch->lock); | |
1837 | if (ret) | |
1838 | return ret; | |
1839 | ||
1840 | if (cm_enabled) { | |
1841 | ret = ccw_set_cmf(cdev, 1); | |
1842 | if (ret) | |
1843 | return ret; | |
1844 | } | |
1845 | ||
1846 | if (cdev->drv && cdev->drv->thaw) | |
1847 | ret = cdev->drv->thaw(cdev); | |
1848 | ||
1849 | return ret; | |
1850 | } | |
1851 | ||
1852 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1853 | { | |
1854 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1855 | int ret; | |
1856 | ||
1857 | if (cio_is_console(sch->schid)) | |
1858 | goto out; | |
1859 | /* | |
1860 | * While we were sleeping, devices may have gone or become | |
1861 | * available again. Kick re-detection. | |
1862 | */ | |
1863 | spin_lock_irq(sch->lock); | |
1864 | cdev->private->flags.resuming = 1; | |
1865 | ret = ccw_device_recognition(cdev); | |
1866 | spin_unlock_irq(sch->lock); | |
1867 | if (ret) { | |
1868 | CIO_MSG_EVENT(0, "Couldn't start recognition for device " | |
f014824e SO |
1869 | "0.%x.%04x (ret=%d)\n", |
1870 | cdev->private->dev_id.ssid, | |
1871 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1872 | spin_lock_irq(sch->lock); |
1873 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1874 | spin_unlock_irq(sch->lock); | |
1875 | /* notify driver after the resume cb */ | |
1876 | goto out; | |
1877 | } | |
1878 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || | |
1879 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
1880 | ||
1881 | out: | |
1882 | cdev->private->flags.resuming = 0; | |
1883 | } | |
1884 | ||
1885 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1886 | { | |
1887 | cdev->private->state = DEV_STATE_BOXED; | |
1888 | if (ccw_device_notify(cdev, CIO_BOXED)) | |
1889 | return 0; | |
1890 | ccw_device_schedule_sch_unregister(cdev); | |
1891 | return -ENODEV; | |
1892 | } | |
1893 | ||
1894 | static int resume_handle_disc(struct ccw_device *cdev) | |
1895 | { | |
1896 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1897 | if (ccw_device_notify(cdev, CIO_GONE)) | |
1898 | return 0; | |
1899 | ccw_device_schedule_sch_unregister(cdev); | |
1900 | return -ENODEV; | |
1901 | } | |
1902 | ||
1903 | static int ccw_device_pm_restore(struct device *dev) | |
1904 | { | |
1905 | struct ccw_device *cdev = to_ccwdev(dev); | |
1906 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1907 | int ret = 0, cm_enabled; | |
1908 | ||
1909 | __ccw_device_pm_restore(cdev); | |
1910 | spin_lock_irq(sch->lock); | |
1911 | if (cio_is_console(sch->schid)) { | |
1912 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1913 | spin_unlock_irq(sch->lock); | |
1914 | goto out_restore; | |
1915 | } | |
1916 | cdev->private->flags.donotify = 0; | |
1917 | /* check recognition results */ | |
1918 | switch (cdev->private->state) { | |
1919 | case DEV_STATE_OFFLINE: | |
1920 | break; | |
1921 | case DEV_STATE_BOXED: | |
1922 | ret = resume_handle_boxed(cdev); | |
1923 | spin_unlock_irq(sch->lock); | |
1924 | if (ret) | |
1925 | goto out; | |
1926 | goto out_restore; | |
1927 | case DEV_STATE_DISCONNECTED: | |
1928 | goto out_disc_unlock; | |
1929 | default: | |
1930 | goto out_unreg_unlock; | |
1931 | } | |
1932 | /* check if the device id has changed */ | |
1933 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
f014824e SO |
1934 | CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno " |
1935 | "changed from %04x to %04x)\n", | |
1936 | sch->schid.ssid, sch->schid.sch_no, | |
823d494a SO |
1937 | cdev->private->dev_id.devno, |
1938 | sch->schib.pmcw.dev); | |
1939 | goto out_unreg_unlock; | |
1940 | } | |
1941 | /* check if the device type has changed */ | |
1942 | if (!ccw_device_test_sense_data(cdev)) { | |
1943 | ccw_device_update_sense_data(cdev); | |
1944 | PREPARE_WORK(&cdev->private->kick_work, | |
1945 | ccw_device_do_unbind_bind); | |
1946 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
1947 | ret = -ENODEV; | |
1948 | goto out_unlock; | |
1949 | } | |
1950 | if (!cdev->online) { | |
1951 | ret = 0; | |
1952 | goto out_unlock; | |
1953 | } | |
1954 | ret = ccw_device_online(cdev); | |
1955 | if (ret) | |
1956 | goto out_disc_unlock; | |
1957 | ||
1958 | cm_enabled = cdev->private->cmb != NULL; | |
1959 | spin_unlock_irq(sch->lock); | |
1960 | ||
1961 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1962 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
1963 | spin_lock_irq(sch->lock); | |
1964 | goto out_disc_unlock; | |
1965 | } | |
1966 | if (cm_enabled) { | |
1967 | ret = ccw_set_cmf(cdev, 1); | |
1968 | if (ret) { | |
f014824e SO |
1969 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1970 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1971 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1972 | ret = 0; |
1973 | } | |
1974 | } | |
1975 | ||
1976 | out_restore: | |
1977 | if (cdev->online && cdev->drv && cdev->drv->restore) | |
1978 | ret = cdev->drv->restore(cdev); | |
1979 | out: | |
1980 | return ret; | |
1981 | ||
1982 | out_disc_unlock: | |
1983 | ret = resume_handle_disc(cdev); | |
1984 | spin_unlock_irq(sch->lock); | |
1985 | if (ret) | |
1986 | return ret; | |
1987 | goto out_restore; | |
1988 | ||
1989 | out_unreg_unlock: | |
1990 | ccw_device_schedule_sch_unregister(cdev); | |
1991 | ret = -ENODEV; | |
1992 | out_unlock: | |
1993 | spin_unlock_irq(sch->lock); | |
1994 | return ret; | |
1995 | } | |
1996 | ||
1997 | static struct dev_pm_ops ccw_pm_ops = { | |
1998 | .prepare = ccw_device_pm_prepare, | |
1999 | .complete = ccw_device_pm_complete, | |
2000 | .freeze = ccw_device_pm_freeze, | |
2001 | .thaw = ccw_device_pm_thaw, | |
2002 | .restore = ccw_device_pm_restore, | |
2003 | }; | |
2004 | ||
8bbace7e CH |
2005 | struct bus_type ccw_bus_type = { |
2006 | .name = "ccw", | |
2007 | .match = ccw_bus_match, | |
2008 | .uevent = ccw_uevent, | |
2009 | .probe = ccw_device_probe, | |
2010 | .remove = ccw_device_remove, | |
958974fb | 2011 | .shutdown = ccw_device_shutdown, |
823d494a | 2012 | .pm = &ccw_pm_ops, |
8bbace7e CH |
2013 | }; |
2014 | ||
b2ffd8e9 CH |
2015 | /** |
2016 | * ccw_driver_register() - register a ccw driver | |
2017 | * @cdriver: driver to be registered | |
2018 | * | |
2019 | * This function is mainly a wrapper around driver_register(). | |
2020 | * Returns: | |
2021 | * %0 on success and a negative error value on failure. | |
2022 | */ | |
2023 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2024 | { |
2025 | struct device_driver *drv = &cdriver->driver; | |
2026 | ||
2027 | drv->bus = &ccw_bus_type; | |
2028 | drv->name = cdriver->name; | |
4beee646 | 2029 | drv->owner = cdriver->owner; |
1da177e4 LT |
2030 | |
2031 | return driver_register(drv); | |
2032 | } | |
2033 | ||
b2ffd8e9 CH |
2034 | /** |
2035 | * ccw_driver_unregister() - deregister a ccw driver | |
2036 | * @cdriver: driver to be deregistered | |
2037 | * | |
2038 | * This function is mainly a wrapper around driver_unregister(). | |
2039 | */ | |
2040 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2041 | { |
2042 | driver_unregister(&cdriver->driver); | |
2043 | } | |
2044 | ||
a8237fc4 CH |
2045 | /* Helper func for qdio. */ |
2046 | struct subchannel_id | |
2047 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
2048 | { | |
2049 | struct subchannel *sch; | |
2050 | ||
2051 | sch = to_subchannel(cdev->dev.parent); | |
2052 | return sch->schid; | |
2053 | } | |
2054 | ||
1da177e4 LT |
2055 | MODULE_LICENSE("GPL"); |
2056 | EXPORT_SYMBOL(ccw_device_set_online); | |
2057 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2058 | EXPORT_SYMBOL(ccw_driver_register); | |
2059 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2060 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
2061 | EXPORT_SYMBOL(ccw_bus_type); | |
2062 | EXPORT_SYMBOL(ccw_device_work); | |
a8237fc4 | 2063 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |