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 | ||
b0744bd2 | 676 | struct match_data { |
78964268 | 677 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
678 | struct ccw_device * sibling; |
679 | }; | |
680 | ||
681 | static int | |
682 | match_devno(struct device * dev, void * data) | |
683 | { | |
78964268 | 684 | struct match_data * d = data; |
b0744bd2 CH |
685 | struct ccw_device * cdev; |
686 | ||
687 | cdev = to_ccwdev(dev); | |
688 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 689 | !ccw_device_is_orphan(cdev) && |
78964268 | 690 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 691 | (cdev != d->sibling)) |
b0744bd2 | 692 | return 1; |
b0744bd2 CH |
693 | return 0; |
694 | } | |
695 | ||
78964268 CH |
696 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
697 | struct ccw_device *sibling) | |
1da177e4 | 698 | { |
1da177e4 | 699 | struct device *dev; |
292888c8 | 700 | struct match_data data; |
1da177e4 | 701 | |
78964268 | 702 | data.dev_id = *dev_id; |
292888c8 | 703 | data.sibling = sibling; |
e5945b4f | 704 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 705 | |
b0744bd2 | 706 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
707 | } |
708 | ||
d7b5a4c9 CH |
709 | static int match_orphan(struct device *dev, void *data) |
710 | { | |
711 | struct ccw_dev_id *dev_id; | |
712 | struct ccw_device *cdev; | |
713 | ||
714 | dev_id = data; | |
715 | cdev = to_ccwdev(dev); | |
716 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
717 | } | |
718 | ||
719 | static struct ccw_device * | |
720 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
721 | struct ccw_dev_id *dev_id) | |
722 | { | |
723 | struct device *dev; | |
724 | ||
725 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
726 | match_orphan); | |
727 | ||
728 | return dev ? to_ccwdev(dev) : NULL; | |
729 | } | |
730 | ||
eb32ae8d | 731 | void ccw_device_do_unbind_bind(struct work_struct *work) |
1da177e4 | 732 | { |
c1637532 | 733 | struct ccw_device_private *priv; |
1da177e4 LT |
734 | struct ccw_device *cdev; |
735 | struct subchannel *sch; | |
eb32ae8d | 736 | int ret; |
1da177e4 | 737 | |
c1637532 MS |
738 | priv = container_of(work, struct ccw_device_private, kick_work); |
739 | cdev = priv->cdev; | |
1da177e4 | 740 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 741 | |
eb32ae8d CH |
742 | if (test_bit(1, &cdev->private->registered)) { |
743 | device_release_driver(&cdev->dev); | |
744 | ret = device_attach(&cdev->dev); | |
745 | WARN_ON(ret == -ENODEV); | |
746 | } | |
1da177e4 LT |
747 | } |
748 | ||
749 | static void | |
750 | ccw_device_release(struct device *dev) | |
751 | { | |
752 | struct ccw_device *cdev; | |
753 | ||
754 | cdev = to_ccwdev(dev); | |
6eff208f CH |
755 | /* Release reference of parent subchannel. */ |
756 | put_device(cdev->dev.parent); | |
1da177e4 LT |
757 | kfree(cdev->private); |
758 | kfree(cdev); | |
759 | } | |
760 | ||
7674da77 CH |
761 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
762 | { | |
763 | struct ccw_device *cdev; | |
764 | ||
765 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
766 | if (cdev) { | |
767 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
768 | GFP_KERNEL | GFP_DMA); | |
769 | if (cdev->private) | |
770 | return cdev; | |
771 | } | |
772 | kfree(cdev); | |
773 | return ERR_PTR(-ENOMEM); | |
774 | } | |
775 | ||
776 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
777 | struct ccw_device *cdev) | |
778 | { | |
779 | cdev->private->cdev = cdev; | |
780 | atomic_set(&cdev->private->onoff, 0); | |
781 | cdev->dev.parent = &sch->dev; | |
782 | cdev->dev.release = ccw_device_release; | |
33583c36 | 783 | INIT_WORK(&cdev->private->kick_work, NULL); |
ef99516c | 784 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
785 | /* Do first half of device_register. */ |
786 | device_initialize(&cdev->dev); | |
787 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
788 | /* Release reference from device_initialize(). */ |
789 | put_device(&cdev->dev); | |
7674da77 CH |
790 | return -ENODEV; |
791 | } | |
792 | return 0; | |
793 | } | |
794 | ||
795 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
796 | { | |
797 | struct ccw_device *cdev; | |
798 | int ret; | |
799 | ||
800 | cdev = io_subchannel_allocate_dev(sch); | |
801 | if (!IS_ERR(cdev)) { | |
802 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 803 | if (ret) |
7674da77 | 804 | cdev = ERR_PTR(ret); |
7674da77 CH |
805 | } |
806 | return cdev; | |
807 | } | |
808 | ||
d7b5a4c9 CH |
809 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
810 | ||
811 | static void sch_attach_device(struct subchannel *sch, | |
812 | struct ccw_device *cdev) | |
813 | { | |
82b7ac05 | 814 | css_update_ssd_info(sch); |
d7b5a4c9 | 815 | spin_lock_irq(sch->lock); |
db6a6423 | 816 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
817 | cdev->private->schid = sch->schid; |
818 | cdev->ccwlock = sch->lock; | |
c820de39 | 819 | ccw_device_trigger_reprobe(cdev); |
d7b5a4c9 CH |
820 | spin_unlock_irq(sch->lock); |
821 | } | |
822 | ||
823 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
824 | struct ccw_device *cdev) | |
825 | { | |
826 | struct subchannel *other_sch; | |
827 | int ret; | |
828 | ||
6eff208f CH |
829 | /* Get reference for new parent. */ |
830 | if (!get_device(&sch->dev)) | |
831 | return; | |
832 | other_sch = to_subchannel(cdev->dev.parent); | |
833 | /* Note: device_move() changes cdev->dev.parent */ | |
ffa6a705 | 834 | ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 | 835 | if (ret) { |
139b83dd | 836 | CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed " |
d7b5a4c9 CH |
837 | "(ret=%d)!\n", cdev->private->dev_id.ssid, |
838 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
839 | /* Put reference for new parent. */ |
840 | put_device(&sch->dev); | |
d7b5a4c9 CH |
841 | return; |
842 | } | |
db6a6423 | 843 | sch_set_cdev(other_sch, NULL); |
d7b5a4c9 CH |
844 | /* No need to keep a subchannel without ccw device around. */ |
845 | css_sch_device_unregister(other_sch); | |
d7b5a4c9 | 846 | sch_attach_device(sch, cdev); |
6eff208f CH |
847 | /* Put reference for old parent. */ |
848 | put_device(&other_sch->dev); | |
d7b5a4c9 CH |
849 | } |
850 | ||
851 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
852 | struct ccw_device *cdev) | |
853 | { | |
854 | int ret; | |
6eff208f | 855 | struct subchannel *pseudo_sch; |
d7b5a4c9 | 856 | |
6eff208f CH |
857 | /* Get reference for new parent. */ |
858 | if (!get_device(&sch->dev)) | |
859 | return; | |
860 | pseudo_sch = to_subchannel(cdev->dev.parent); | |
861 | /* | |
862 | * Try to move the ccw device to its new subchannel. | |
863 | * Note: device_move() changes cdev->dev.parent | |
864 | */ | |
ffa6a705 | 865 | ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
866 | if (ret) { |
867 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
868 | "failed (ret=%d)!\n", | |
869 | cdev->private->dev_id.ssid, | |
870 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
871 | /* Put reference for new parent. */ |
872 | put_device(&sch->dev); | |
d7b5a4c9 CH |
873 | return; |
874 | } | |
875 | sch_attach_device(sch, cdev); | |
6eff208f CH |
876 | /* Put reference on pseudo subchannel. */ |
877 | put_device(&pseudo_sch->dev); | |
d7b5a4c9 CH |
878 | } |
879 | ||
880 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
881 | { | |
882 | struct ccw_device *cdev; | |
883 | ||
884 | /* Need to allocate a new ccw device. */ | |
885 | cdev = io_subchannel_create_ccwdev(sch); | |
886 | if (IS_ERR(cdev)) { | |
887 | /* OK, we did everything we could... */ | |
888 | css_sch_device_unregister(sch); | |
889 | return; | |
890 | } | |
891 | spin_lock_irq(sch->lock); | |
db6a6423 | 892 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
893 | spin_unlock_irq(sch->lock); |
894 | /* Start recognition for the new ccw device. */ | |
895 | if (io_subchannel_recog(cdev, sch)) { | |
896 | spin_lock_irq(sch->lock); | |
db6a6423 | 897 | sch_set_cdev(sch, NULL); |
d7b5a4c9 | 898 | spin_unlock_irq(sch->lock); |
d7b5a4c9 | 899 | css_sch_device_unregister(sch); |
6eff208f CH |
900 | /* Put reference from io_subchannel_create_ccwdev(). */ |
901 | put_device(&sch->dev); | |
902 | /* Give up initial reference. */ | |
903 | put_device(&cdev->dev); | |
d7b5a4c9 CH |
904 | } |
905 | } | |
906 | ||
907 | ||
908 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
909 | { | |
910 | struct ccw_device_private *priv; | |
911 | struct ccw_device *cdev; | |
912 | struct ccw_device *replacing_cdev; | |
913 | struct subchannel *sch; | |
914 | int ret; | |
915 | struct channel_subsystem *css; | |
916 | struct ccw_dev_id dev_id; | |
917 | ||
918 | priv = container_of(work, struct ccw_device_private, kick_work); | |
919 | cdev = priv->cdev; | |
920 | sch = to_subchannel(cdev->dev.parent); | |
921 | css = to_css(sch->dev.parent); | |
922 | dev_id.devno = sch->schib.pmcw.dev; | |
923 | dev_id.ssid = sch->schid.ssid; | |
924 | ||
6eff208f CH |
925 | /* Increase refcount for pseudo subchannel. */ |
926 | get_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 CH |
927 | /* |
928 | * Move the orphaned ccw device to the orphanage so the replacing | |
929 | * ccw device can take its place on the subchannel. | |
6eff208f | 930 | * Note: device_move() changes cdev->dev.parent |
d7b5a4c9 | 931 | */ |
ffa6a705 CH |
932 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev, |
933 | DPM_ORDER_NONE); | |
d7b5a4c9 CH |
934 | if (ret) { |
935 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
936 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
937 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
938 | /* Decrease refcount for pseudo subchannel again. */ |
939 | put_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 CH |
940 | return; |
941 | } | |
942 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
943 | /* | |
944 | * Search for the replacing ccw device | |
945 | * - among the disconnected devices | |
946 | * - in the orphanage | |
947 | */ | |
948 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
949 | if (replacing_cdev) { | |
950 | sch_attach_disconnected_device(sch, replacing_cdev); | |
85acc407 | 951 | /* Release reference from get_disc_ccwdev_by_dev_id() */ |
97166f52 | 952 | put_device(&replacing_cdev->dev); |
6eff208f CH |
953 | /* Release reference of subchannel from old cdev. */ |
954 | put_device(&sch->dev); | |
d7b5a4c9 CH |
955 | return; |
956 | } | |
957 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
958 | if (replacing_cdev) { | |
959 | sch_attach_orphaned_device(sch, replacing_cdev); | |
85acc407 | 960 | /* Release reference from get_orphaned_ccwdev_by_dev_id() */ |
97166f52 | 961 | put_device(&replacing_cdev->dev); |
6eff208f CH |
962 | /* Release reference of subchannel from old cdev. */ |
963 | put_device(&sch->dev); | |
d7b5a4c9 CH |
964 | return; |
965 | } | |
966 | sch_create_and_recog_new_device(sch); | |
6eff208f CH |
967 | /* Release reference of subchannel from old cdev. */ |
968 | put_device(&sch->dev); | |
d7b5a4c9 CH |
969 | } |
970 | ||
1da177e4 LT |
971 | /* |
972 | * Register recognized device. | |
973 | */ | |
974 | static void | |
c1637532 | 975 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 976 | { |
c1637532 | 977 | struct ccw_device_private *priv; |
1da177e4 LT |
978 | struct ccw_device *cdev; |
979 | struct subchannel *sch; | |
980 | int ret; | |
981 | unsigned long flags; | |
982 | ||
c1637532 MS |
983 | priv = container_of(work, struct ccw_device_private, kick_work); |
984 | cdev = priv->cdev; | |
1da177e4 | 985 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
986 | /* |
987 | * Check if subchannel is still registered. It may have become | |
988 | * unregistered if a machine check hit us after finishing | |
989 | * device recognition but before the register work could be | |
990 | * queued. | |
991 | */ | |
992 | if (!device_is_registered(&sch->dev)) | |
993 | goto out_err; | |
82b7ac05 | 994 | css_update_ssd_info(sch); |
47af5518 CH |
995 | /* |
996 | * io_subchannel_register() will also be called after device | |
997 | * recognition has been done for a boxed device (which will already | |
998 | * be registered). We need to reprobe since we may now have sense id | |
999 | * information. | |
1000 | */ | |
d6a30761 | 1001 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
1002 | if (!cdev->drv) { |
1003 | ret = device_reprobe(&cdev->dev); | |
1004 | if (ret) | |
1005 | /* We can't do much here. */ | |
139b83dd | 1006 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
1007 | " %d for 0.%x.%04x\n", ret, |
1008 | cdev->private->dev_id.ssid, | |
1009 | cdev->private->dev_id.devno); | |
47af5518 | 1010 | } |
1da177e4 LT |
1011 | goto out; |
1012 | } | |
fa1a8c23 CH |
1013 | /* |
1014 | * Now we know this subchannel will stay, we can throw | |
1015 | * our delayed uevent. | |
1016 | */ | |
f67f129e | 1017 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 1018 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
1019 | /* make it known to the system */ |
1020 | ret = ccw_device_register(cdev); | |
1021 | if (ret) { | |
e556bbbd CH |
1022 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
1023 | cdev->private->dev_id.ssid, | |
1024 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 1025 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 1026 | sch_set_cdev(sch, NULL); |
2ec22984 | 1027 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
1028 | /* Release initial device reference. */ |
1029 | put_device(&cdev->dev); | |
5fb6b854 | 1030 | goto out_err; |
1da177e4 | 1031 | } |
1da177e4 LT |
1032 | out: |
1033 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 1034 | wake_up(&cdev->private->wait_q); |
5fb6b854 CH |
1035 | out_err: |
1036 | /* Release reference for workqueue processing. */ | |
1037 | put_device(&cdev->dev); | |
1da177e4 LT |
1038 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1039 | wake_up(&ccw_device_init_wq); | |
1040 | } | |
1041 | ||
3f4cf6e7 | 1042 | static void ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 1043 | { |
c1637532 MS |
1044 | struct ccw_device_private *priv; |
1045 | struct ccw_device *cdev; | |
1da177e4 LT |
1046 | struct subchannel *sch; |
1047 | ||
c1637532 MS |
1048 | priv = container_of(work, struct ccw_device_private, kick_work); |
1049 | cdev = priv->cdev; | |
46fbe4e4 PO |
1050 | /* Get subchannel reference for local processing. */ |
1051 | if (!get_device(cdev->dev.parent)) | |
1052 | return; | |
1da177e4 | 1053 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 1054 | css_sch_device_unregister(sch); |
46fbe4e4 | 1055 | /* Release cdev reference for workqueue processing.*/ |
1da177e4 | 1056 | put_device(&cdev->dev); |
46fbe4e4 | 1057 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
1058 | put_device(&sch->dev); |
1059 | } | |
1060 | ||
c4621a62 SO |
1061 | void ccw_device_schedule_sch_unregister(struct ccw_device *cdev) |
1062 | { | |
be7a2ddc SO |
1063 | /* Get cdev reference for workqueue processing. */ |
1064 | if (!get_device(&cdev->dev)) | |
1065 | return; | |
c4621a62 SO |
1066 | PREPARE_WORK(&cdev->private->kick_work, |
1067 | ccw_device_call_sch_unregister); | |
1068 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1069 | } | |
1070 | ||
1da177e4 LT |
1071 | /* |
1072 | * subchannel recognition done. Called from the state machine. | |
1073 | */ | |
1074 | void | |
1075 | io_subchannel_recog_done(struct ccw_device *cdev) | |
1076 | { | |
1da177e4 LT |
1077 | if (css_init_done == 0) { |
1078 | cdev->private->flags.recog_done = 1; | |
1079 | return; | |
1080 | } | |
1081 | switch (cdev->private->state) { | |
47593bfa SO |
1082 | case DEV_STATE_BOXED: |
1083 | /* Device did not respond in time. */ | |
1da177e4 LT |
1084 | case DEV_STATE_NOT_OPER: |
1085 | cdev->private->flags.recog_done = 1; | |
c4621a62 | 1086 | ccw_device_schedule_sch_unregister(cdev); |
1da177e4 LT |
1087 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1088 | wake_up(&ccw_device_init_wq); | |
1089 | break; | |
1da177e4 LT |
1090 | case DEV_STATE_OFFLINE: |
1091 | /* | |
1092 | * We can't register the device in interrupt context so | |
1093 | * we schedule a work item. | |
1094 | */ | |
1095 | if (!get_device(&cdev->dev)) | |
1096 | break; | |
1097 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1098 | io_subchannel_register); |
1da177e4 LT |
1099 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1100 | break; | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | static int | |
1105 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
1106 | { | |
1107 | int rc; | |
1108 | struct ccw_device_private *priv; | |
1109 | ||
db6a6423 | 1110 | sch_set_cdev(sch, cdev); |
2ec22984 | 1111 | cdev->ccwlock = sch->lock; |
fb6958a5 | 1112 | |
1da177e4 LT |
1113 | /* Init private data. */ |
1114 | priv = cdev->private; | |
78964268 CH |
1115 | priv->dev_id.devno = sch->schib.pmcw.dev; |
1116 | priv->dev_id.ssid = sch->schid.ssid; | |
1117 | priv->schid = sch->schid; | |
1da177e4 LT |
1118 | priv->state = DEV_STATE_NOT_OPER; |
1119 | INIT_LIST_HEAD(&priv->cmb_list); | |
1120 | init_waitqueue_head(&priv->wait_q); | |
1121 | init_timer(&priv->timer); | |
1122 | ||
1da177e4 LT |
1123 | /* Increase counter of devices currently in recognition. */ |
1124 | atomic_inc(&ccw_device_init_count); | |
1125 | ||
1126 | /* Start async. device sensing. */ | |
2ec22984 | 1127 | spin_lock_irq(sch->lock); |
1da177e4 | 1128 | rc = ccw_device_recognition(cdev); |
2ec22984 | 1129 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
1130 | if (rc) { |
1131 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1132 | wake_up(&ccw_device_init_wq); | |
1133 | } | |
1134 | return rc; | |
1135 | } | |
1136 | ||
d7b5a4c9 CH |
1137 | static void ccw_device_move_to_sch(struct work_struct *work) |
1138 | { | |
1139 | struct ccw_device_private *priv; | |
1140 | int rc; | |
1141 | struct subchannel *sch; | |
1142 | struct ccw_device *cdev; | |
1143 | struct subchannel *former_parent; | |
1144 | ||
1145 | priv = container_of(work, struct ccw_device_private, kick_work); | |
1146 | sch = priv->sch; | |
1147 | cdev = priv->cdev; | |
6eff208f CH |
1148 | former_parent = to_subchannel(cdev->dev.parent); |
1149 | /* Get reference for new parent. */ | |
1150 | if (!get_device(&sch->dev)) | |
1151 | return; | |
d7b5a4c9 | 1152 | mutex_lock(&sch->reg_mutex); |
6eff208f CH |
1153 | /* |
1154 | * Try to move the ccw device to its new subchannel. | |
1155 | * Note: device_move() changes cdev->dev.parent | |
1156 | */ | |
ffa6a705 | 1157 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
1158 | mutex_unlock(&sch->reg_mutex); |
1159 | if (rc) { | |
139b83dd | 1160 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel " |
d7b5a4c9 CH |
1161 | "0.%x.%04x failed (ret=%d)!\n", |
1162 | cdev->private->dev_id.ssid, | |
1163 | cdev->private->dev_id.devno, sch->schid.ssid, | |
1164 | sch->schid.sch_no, rc); | |
1165 | css_sch_device_unregister(sch); | |
6eff208f CH |
1166 | /* Put reference for new parent again. */ |
1167 | put_device(&sch->dev); | |
d7b5a4c9 CH |
1168 | goto out; |
1169 | } | |
6eff208f | 1170 | if (!sch_is_pseudo_sch(former_parent)) { |
d7b5a4c9 | 1171 | spin_lock_irq(former_parent->lock); |
db6a6423 | 1172 | sch_set_cdev(former_parent, NULL); |
d7b5a4c9 CH |
1173 | spin_unlock_irq(former_parent->lock); |
1174 | css_sch_device_unregister(former_parent); | |
1175 | /* Reset intparm to zeroes. */ | |
13952ec1 SO |
1176 | former_parent->config.intparm = 0; |
1177 | cio_commit_config(former_parent); | |
d7b5a4c9 CH |
1178 | } |
1179 | sch_attach_device(sch, cdev); | |
1180 | out: | |
6eff208f CH |
1181 | /* Put reference for old parent. */ |
1182 | put_device(&former_parent->dev); | |
d7b5a4c9 CH |
1183 | put_device(&cdev->dev); |
1184 | } | |
1185 | ||
602b20f2 CH |
1186 | static void io_subchannel_irq(struct subchannel *sch) |
1187 | { | |
1188 | struct ccw_device *cdev; | |
1189 | ||
db6a6423 | 1190 | cdev = sch_get_cdev(sch); |
602b20f2 | 1191 | |
efd986db SO |
1192 | CIO_TRACE_EVENT(6, "IRQ"); |
1193 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
1194 | if (cdev) |
1195 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1196 | } | |
1197 | ||
13952ec1 SO |
1198 | void io_subchannel_init_config(struct subchannel *sch) |
1199 | { | |
1200 | memset(&sch->config, 0, sizeof(sch->config)); | |
1201 | sch->config.csense = 1; | |
d36f0c66 SO |
1202 | /* Use subchannel mp mode when there is more than 1 installed CHPID. */ |
1203 | if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0) | |
13952ec1 SO |
1204 | sch->config.mp = 1; |
1205 | } | |
1206 | ||
0ae7a7b2 CH |
1207 | static void io_subchannel_init_fields(struct subchannel *sch) |
1208 | { | |
1209 | if (cio_is_console(sch->schid)) | |
1210 | sch->opm = 0xff; | |
1211 | else | |
1212 | sch->opm = chp_get_sch_opm(sch); | |
1213 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1214 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1215 | |
1216 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1217 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1218 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1219 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1220 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1221 | |
1222 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1223 | } |
1224 | ||
90ed2b69 CH |
1225 | static void io_subchannel_do_unreg(struct work_struct *work) |
1226 | { | |
1227 | struct subchannel *sch; | |
1228 | ||
1229 | sch = container_of(work, struct subchannel, work); | |
1230 | css_sch_device_unregister(sch); | |
90ed2b69 CH |
1231 | put_device(&sch->dev); |
1232 | } | |
1233 | ||
1234 | /* Schedule unregister if we have no cdev. */ | |
1235 | static void io_subchannel_schedule_removal(struct subchannel *sch) | |
1236 | { | |
1237 | get_device(&sch->dev); | |
1238 | INIT_WORK(&sch->work, io_subchannel_do_unreg); | |
1239 | queue_work(slow_path_wq, &sch->work); | |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * Note: We always return 0 so that we bind to the device even on error. | |
1244 | * This is needed so that our remove function is called on unregister. | |
1245 | */ | |
0ae7a7b2 | 1246 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1247 | { |
1da177e4 LT |
1248 | struct ccw_device *cdev; |
1249 | int rc; | |
1250 | unsigned long flags; | |
d7b5a4c9 | 1251 | struct ccw_dev_id dev_id; |
1da177e4 | 1252 | |
6d7c5afc | 1253 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1254 | rc = sysfs_create_group(&sch->dev.kobj, |
1255 | &io_subchannel_attr_group); | |
1256 | if (rc) | |
1257 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1258 | "attributes for subchannel " | |
1259 | "0.%x.%04x (rc=%d)\n", | |
1260 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1261 | /* |
6d7c5afc | 1262 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1263 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1264 | * the ccw_device and exit. |
1da177e4 | 1265 | */ |
f67f129e | 1266 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1267 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1268 | cdev = sch_get_cdev(sch); |
e1031786 | 1269 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1270 | device_initialize(&cdev->dev); |
1271 | ccw_device_register(cdev); | |
1da177e4 LT |
1272 | /* |
1273 | * Check if the device is already online. If it is | |
9cd67421 CH |
1274 | * the reference count needs to be corrected since we |
1275 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1276 | */ |
1277 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1278 | cdev->private->state != DEV_STATE_OFFLINE && | |
1279 | cdev->private->state != DEV_STATE_BOXED) | |
1280 | get_device(&cdev->dev); | |
1281 | return 0; | |
1282 | } | |
0ae7a7b2 | 1283 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1284 | rc = cio_commit_config(sch); |
1285 | if (rc) | |
1286 | goto out_schedule; | |
7e9db9ea CH |
1287 | rc = sysfs_create_group(&sch->dev.kobj, |
1288 | &io_subchannel_attr_group); | |
1289 | if (rc) | |
90ed2b69 | 1290 | goto out_schedule; |
cd6b4f27 CH |
1291 | /* Allocate I/O subchannel private data. */ |
1292 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1293 | GFP_KERNEL | GFP_DMA); | |
90ed2b69 | 1294 | if (!sch->private) |
7e9db9ea | 1295 | goto out_err; |
111e95a4 SO |
1296 | /* |
1297 | * First check if a fitting device may be found amongst the | |
1298 | * disconnected devices or in the orphanage. | |
1299 | */ | |
1300 | dev_id.devno = sch->schib.pmcw.dev; | |
1301 | dev_id.ssid = sch->schid.ssid; | |
d7b5a4c9 CH |
1302 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); |
1303 | if (!cdev) | |
1304 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1305 | &dev_id); | |
1306 | if (cdev) { | |
1307 | /* | |
1308 | * Schedule moving the device until when we have a registered | |
1309 | * subchannel to move to and succeed the probe. We can | |
1310 | * unregister later again, when the probe is through. | |
1311 | */ | |
1312 | cdev->private->sch = sch; | |
1313 | PREPARE_WORK(&cdev->private->kick_work, | |
1314 | ccw_device_move_to_sch); | |
1315 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1316 | return 0; | |
1317 | } | |
7674da77 | 1318 | cdev = io_subchannel_create_ccwdev(sch); |
90ed2b69 | 1319 | if (IS_ERR(cdev)) |
7e9db9ea | 1320 | goto out_err; |
8bbace7e | 1321 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1322 | if (rc) { |
2ec22984 | 1323 | spin_lock_irqsave(sch->lock, flags); |
90ed2b69 | 1324 | io_subchannel_recog_done(cdev); |
2ec22984 | 1325 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 | 1326 | } |
7e9db9ea CH |
1327 | return 0; |
1328 | out_err: | |
1329 | kfree(sch->private); | |
1330 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); | |
90ed2b69 CH |
1331 | out_schedule: |
1332 | io_subchannel_schedule_removal(sch); | |
1333 | return 0; | |
1da177e4 LT |
1334 | } |
1335 | ||
1da177e4 | 1336 | static int |
8bbace7e | 1337 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1338 | { |
1339 | struct ccw_device *cdev; | |
1340 | unsigned long flags; | |
1341 | ||
db6a6423 CH |
1342 | cdev = sch_get_cdev(sch); |
1343 | if (!cdev) | |
1da177e4 | 1344 | return 0; |
1da177e4 LT |
1345 | /* Set ccw device to not operational and drop reference. */ |
1346 | spin_lock_irqsave(cdev->ccwlock, flags); | |
db6a6423 | 1347 | sch_set_cdev(sch, NULL); |
1da177e4 LT |
1348 | cdev->private->state = DEV_STATE_NOT_OPER; |
1349 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c | 1350 | ccw_device_unregister(cdev); |
cd6b4f27 | 1351 | kfree(sch->private); |
7e9db9ea | 1352 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1353 | return 0; |
1354 | } | |
1355 | ||
602b20f2 | 1356 | static int io_subchannel_notify(struct subchannel *sch, int event) |
1da177e4 LT |
1357 | { |
1358 | struct ccw_device *cdev; | |
1359 | ||
db6a6423 | 1360 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1361 | if (!cdev) |
1362 | return 0; | |
c820de39 | 1363 | return ccw_device_notify(cdev, event); |
1da177e4 LT |
1364 | } |
1365 | ||
602b20f2 | 1366 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1367 | { |
1368 | struct ccw_device *cdev; | |
1369 | ||
db6a6423 | 1370 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1371 | if (cdev) |
1372 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1373 | } | |
1374 | ||
c820de39 | 1375 | static int check_for_io_on_path(struct subchannel *sch, int mask) |
1da177e4 | 1376 | { |
cdb912a4 | 1377 | if (cio_update_schib(sch)) |
c820de39 | 1378 | return 0; |
23d805b6 | 1379 | if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask) |
c820de39 CH |
1380 | return 1; |
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | static void terminate_internal_io(struct subchannel *sch, | |
1385 | struct ccw_device *cdev) | |
1386 | { | |
1387 | if (cio_clear(sch)) { | |
1388 | /* Recheck device in case clear failed. */ | |
1389 | sch->lpm = 0; | |
1390 | if (cdev->online) | |
1391 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1392 | else | |
1393 | css_schedule_eval(sch->schid); | |
d23861ff | 1394 | return; |
c820de39 | 1395 | } |
1da177e4 | 1396 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
c820de39 CH |
1397 | /* Request retry of internal operation. */ |
1398 | cdev->private->flags.intretry = 1; | |
1399 | /* Call handler. */ | |
1da177e4 LT |
1400 | if (cdev->handler) |
1401 | cdev->handler(cdev, cdev->private->intparm, | |
1402 | ERR_PTR(-EIO)); | |
1403 | } | |
1404 | ||
c820de39 CH |
1405 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1406 | { | |
1407 | struct ccw_device *cdev; | |
1408 | ||
1409 | cdev = sch_get_cdev(sch); | |
1410 | if (!cdev) | |
1411 | return; | |
1412 | if (check_for_io_on_path(sch, mask)) { | |
1413 | if (cdev->private->state == DEV_STATE_ONLINE) | |
1414 | ccw_device_kill_io(cdev); | |
1415 | else { | |
1416 | terminate_internal_io(sch, cdev); | |
1417 | /* Re-start path verification. */ | |
1418 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1419 | } | |
1420 | } else | |
1421 | /* trigger path verification. */ | |
1422 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1423 | ||
1424 | } | |
1425 | ||
99611f87 CH |
1426 | static int io_subchannel_chp_event(struct subchannel *sch, |
1427 | struct chp_link *link, int event) | |
c820de39 CH |
1428 | { |
1429 | int mask; | |
c820de39 | 1430 | |
99611f87 | 1431 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1432 | if (!mask) |
1433 | return 0; | |
1434 | switch (event) { | |
1435 | case CHP_VARY_OFF: | |
1436 | sch->opm &= ~mask; | |
1437 | sch->lpm &= ~mask; | |
1438 | io_subchannel_terminate_path(sch, mask); | |
1439 | break; | |
1440 | case CHP_VARY_ON: | |
1441 | sch->opm |= mask; | |
1442 | sch->lpm |= mask; | |
1443 | io_subchannel_verify(sch); | |
1444 | break; | |
1445 | case CHP_OFFLINE: | |
cdb912a4 | 1446 | if (cio_update_schib(sch)) |
c820de39 CH |
1447 | return -ENODEV; |
1448 | io_subchannel_terminate_path(sch, mask); | |
1449 | break; | |
1450 | case CHP_ONLINE: | |
cdb912a4 SO |
1451 | if (cio_update_schib(sch)) |
1452 | return -ENODEV; | |
c820de39 CH |
1453 | sch->lpm |= mask & sch->opm; |
1454 | io_subchannel_verify(sch); | |
1455 | break; | |
1456 | } | |
1457 | return 0; | |
1458 | } | |
1459 | ||
1da177e4 | 1460 | static void |
8bbace7e | 1461 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1462 | { |
1da177e4 LT |
1463 | struct ccw_device *cdev; |
1464 | int ret; | |
1465 | ||
db6a6423 | 1466 | cdev = sch_get_cdev(sch); |
1da177e4 | 1467 | |
a8237fc4 | 1468 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1469 | return; |
1470 | if (!sch->schib.pmcw.ena) | |
1471 | /* Nothing to do. */ | |
1472 | return; | |
1473 | ret = cio_disable_subchannel(sch); | |
1474 | if (ret != -EBUSY) | |
1475 | /* Subchannel is disabled, we're done. */ | |
1476 | return; | |
1477 | cdev->private->state = DEV_STATE_QUIESCE; | |
1478 | if (cdev->handler) | |
1479 | cdev->handler(cdev, cdev->private->intparm, | |
1480 | ERR_PTR(-EIO)); | |
1481 | ret = ccw_device_cancel_halt_clear(cdev); | |
1482 | if (ret == -EBUSY) { | |
1483 | ccw_device_set_timeout(cdev, HZ/10); | |
1484 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1485 | } | |
1486 | cio_disable_subchannel(sch); | |
1487 | } | |
1488 | ||
c820de39 CH |
1489 | static int io_subchannel_get_status(struct subchannel *sch) |
1490 | { | |
1491 | struct schib schib; | |
1492 | ||
1493 | if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) | |
1494 | return CIO_GONE; | |
1495 | if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) | |
1496 | return CIO_REVALIDATE; | |
1497 | if (!sch->lpm) | |
1498 | return CIO_NO_PATH; | |
1499 | return CIO_OPER; | |
1500 | } | |
1501 | ||
1502 | static int device_is_disconnected(struct ccw_device *cdev) | |
1503 | { | |
1504 | if (!cdev) | |
1505 | return 0; | |
1506 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1507 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1508 | } | |
1509 | ||
1510 | static int recovery_check(struct device *dev, void *data) | |
1511 | { | |
1512 | struct ccw_device *cdev = to_ccwdev(dev); | |
1513 | int *redo = data; | |
1514 | ||
1515 | spin_lock_irq(cdev->ccwlock); | |
1516 | switch (cdev->private->state) { | |
1517 | case DEV_STATE_DISCONNECTED: | |
1518 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1519 | cdev->private->dev_id.ssid, | |
1520 | cdev->private->dev_id.devno); | |
1521 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1522 | *redo = 1; | |
1523 | break; | |
1524 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1525 | *redo = 1; | |
1526 | break; | |
1527 | } | |
1528 | spin_unlock_irq(cdev->ccwlock); | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | static void recovery_work_func(struct work_struct *unused) | |
1534 | { | |
1535 | int redo = 0; | |
1536 | ||
1537 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1538 | if (redo) { | |
1539 | spin_lock_irq(&recovery_lock); | |
1540 | if (!timer_pending(&recovery_timer)) { | |
1541 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1542 | recovery_phase++; | |
1543 | mod_timer(&recovery_timer, jiffies + | |
1544 | recovery_delay[recovery_phase] * HZ); | |
1545 | } | |
1546 | spin_unlock_irq(&recovery_lock); | |
1547 | } else | |
1548 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1549 | } | |
1550 | ||
1551 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1552 | ||
1553 | static void recovery_func(unsigned long data) | |
1554 | { | |
1555 | /* | |
1556 | * We can't do our recovery in softirq context and it's not | |
1557 | * performance critical, so we schedule it. | |
1558 | */ | |
1559 | schedule_work(&recovery_work); | |
1560 | } | |
1561 | ||
1562 | static void ccw_device_schedule_recovery(void) | |
1563 | { | |
1564 | unsigned long flags; | |
1565 | ||
1566 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1567 | spin_lock_irqsave(&recovery_lock, flags); | |
1568 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1569 | recovery_phase = 0; | |
1570 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1571 | } | |
1572 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1573 | } | |
1574 | ||
ecf5d9ef PO |
1575 | static int purge_fn(struct device *dev, void *data) |
1576 | { | |
1577 | struct ccw_device *cdev = to_ccwdev(dev); | |
1578 | struct ccw_device_private *priv = cdev->private; | |
1579 | int unreg; | |
1580 | ||
1581 | spin_lock_irq(cdev->ccwlock); | |
1582 | unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) && | |
1583 | (priv->state == DEV_STATE_OFFLINE); | |
1584 | spin_unlock_irq(cdev->ccwlock); | |
1585 | if (!unreg) | |
1586 | goto out; | |
ecf5d9ef PO |
1587 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid, |
1588 | priv->dev_id.devno); | |
c4621a62 | 1589 | ccw_device_schedule_sch_unregister(cdev); |
ecf5d9ef PO |
1590 | |
1591 | out: | |
1592 | /* Abort loop in case of pending signal. */ | |
1593 | if (signal_pending(current)) | |
1594 | return -EINTR; | |
1595 | ||
1596 | return 0; | |
1597 | } | |
1598 | ||
1599 | /** | |
1600 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1601 | * | |
1602 | * Unregister all ccw devices that are offline and on the blacklist. | |
1603 | */ | |
1604 | int ccw_purge_blacklisted(void) | |
1605 | { | |
1606 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1607 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1608 | return 0; | |
1609 | } | |
1610 | ||
6afcc775 | 1611 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1612 | { |
1613 | if (!cdev) | |
1614 | return; | |
1615 | ccw_device_set_timeout(cdev, 0); | |
1616 | cdev->private->flags.fake_irb = 0; | |
1617 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1618 | if (cdev->online) | |
1619 | ccw_device_schedule_recovery(); | |
1620 | } | |
1621 | ||
91c36919 PO |
1622 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1623 | { | |
1624 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1625 | ||
1626 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1627 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1628 | ccw_device_set_timeout(cdev, 0); |
1629 | cio_disable_subchannel(sch); | |
1630 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1631 | } | |
1632 | ||
c820de39 CH |
1633 | static int io_subchannel_sch_event(struct subchannel *sch, int slow) |
1634 | { | |
1635 | int event, ret, disc; | |
1636 | unsigned long flags; | |
91c36919 | 1637 | enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE, DISC } action; |
c820de39 CH |
1638 | struct ccw_device *cdev; |
1639 | ||
1640 | spin_lock_irqsave(sch->lock, flags); | |
1641 | cdev = sch_get_cdev(sch); | |
1642 | disc = device_is_disconnected(cdev); | |
1643 | if (disc && slow) { | |
1644 | /* Disconnected devices are evaluated directly only.*/ | |
1645 | spin_unlock_irqrestore(sch->lock, flags); | |
1646 | return 0; | |
1647 | } | |
1648 | /* No interrupt after machine check - kill pending timers. */ | |
1649 | if (cdev) | |
1650 | ccw_device_set_timeout(cdev, 0); | |
1651 | if (!disc && !slow) { | |
1652 | /* Non-disconnected devices are evaluated on the slow path. */ | |
1653 | spin_unlock_irqrestore(sch->lock, flags); | |
1654 | return -EAGAIN; | |
1655 | } | |
1656 | event = io_subchannel_get_status(sch); | |
1657 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", | |
1658 | sch->schid.ssid, sch->schid.sch_no, event, | |
1659 | disc ? "disconnected" : "normal", | |
1660 | slow ? "slow" : "fast"); | |
1661 | /* Analyze subchannel status. */ | |
1662 | action = NONE; | |
1663 | switch (event) { | |
1664 | case CIO_NO_PATH: | |
1665 | if (disc) { | |
1666 | /* Check if paths have become available. */ | |
1667 | action = REPROBE; | |
1668 | break; | |
1669 | } | |
1670 | /* fall through */ | |
1671 | case CIO_GONE: | |
c820de39 | 1672 | /* Ask driver what to do with device. */ |
91c36919 PO |
1673 | if (io_subchannel_notify(sch, event)) |
1674 | action = DISC; | |
1675 | else | |
1676 | action = UNREGISTER; | |
c820de39 CH |
1677 | break; |
1678 | case CIO_REVALIDATE: | |
1679 | /* Device will be removed, so no notify necessary. */ | |
1680 | if (disc) | |
1681 | /* Reprobe because immediate unregister might block. */ | |
1682 | action = REPROBE; | |
1683 | else | |
1684 | action = UNREGISTER_PROBE; | |
1685 | break; | |
1686 | case CIO_OPER: | |
1687 | if (disc) | |
1688 | /* Get device operational again. */ | |
1689 | action = REPROBE; | |
1690 | break; | |
1691 | } | |
1692 | /* Perform action. */ | |
1693 | ret = 0; | |
1694 | switch (action) { | |
1695 | case UNREGISTER: | |
1696 | case UNREGISTER_PROBE: | |
91c36919 | 1697 | ccw_device_set_notoper(cdev); |
c820de39 CH |
1698 | /* Unregister device (will use subchannel lock). */ |
1699 | spin_unlock_irqrestore(sch->lock, flags); | |
1700 | css_sch_device_unregister(sch); | |
1701 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 CH |
1702 | break; |
1703 | case REPROBE: | |
1704 | ccw_device_trigger_reprobe(cdev); | |
1705 | break; | |
91c36919 | 1706 | case DISC: |
6afcc775 | 1707 | ccw_device_set_disconnected(cdev); |
91c36919 | 1708 | break; |
c820de39 CH |
1709 | default: |
1710 | break; | |
1711 | } | |
1712 | spin_unlock_irqrestore(sch->lock, flags); | |
1713 | /* Probe if necessary. */ | |
1714 | if (action == UNREGISTER_PROBE) | |
1715 | ret = css_probe_device(sch->schid); | |
1716 | ||
1717 | return ret; | |
1718 | } | |
1719 | ||
1da177e4 LT |
1720 | #ifdef CONFIG_CCW_CONSOLE |
1721 | static struct ccw_device console_cdev; | |
1722 | static struct ccw_device_private console_private; | |
1723 | static int console_cdev_in_use; | |
1724 | ||
2ec22984 CH |
1725 | static DEFINE_SPINLOCK(ccw_console_lock); |
1726 | ||
1727 | spinlock_t * cio_get_console_lock(void) | |
1728 | { | |
1729 | return &ccw_console_lock; | |
1730 | } | |
1731 | ||
0ae7a7b2 CH |
1732 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1733 | struct subchannel *sch) | |
1da177e4 LT |
1734 | { |
1735 | int rc; | |
1736 | ||
cd6b4f27 CH |
1737 | /* Attach subchannel private data. */ |
1738 | sch->private = cio_get_console_priv(); | |
1739 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 | 1740 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1741 | rc = cio_commit_config(sch); |
1742 | if (rc) | |
1743 | return rc; | |
0ae7a7b2 | 1744 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1745 | /* Initialize the ccw_device structure. */ |
292888c8 | 1746 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1747 | rc = io_subchannel_recog(cdev, sch); |
1748 | if (rc) | |
1749 | return rc; | |
1750 | ||
1751 | /* Now wait for the async. recognition to come to an end. */ | |
1752 | spin_lock_irq(cdev->ccwlock); | |
1753 | while (!dev_fsm_final_state(cdev)) | |
1754 | wait_cons_dev(); | |
1755 | rc = -EIO; | |
1756 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1757 | goto out_unlock; | |
1758 | ccw_device_online(cdev); | |
1759 | while (!dev_fsm_final_state(cdev)) | |
1760 | wait_cons_dev(); | |
1761 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1762 | goto out_unlock; | |
1763 | rc = 0; | |
1764 | out_unlock: | |
1765 | spin_unlock_irq(cdev->ccwlock); | |
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | struct ccw_device * | |
1770 | ccw_device_probe_console(void) | |
1771 | { | |
1772 | struct subchannel *sch; | |
1773 | int ret; | |
1774 | ||
1775 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1776 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1777 | sch = cio_probe_console(); |
1778 | if (IS_ERR(sch)) { | |
1779 | console_cdev_in_use = 0; | |
1780 | return (void *) sch; | |
1781 | } | |
1782 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1783 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1784 | console_cdev.private = &console_private; | |
c1637532 | 1785 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1786 | ret = ccw_device_console_enable(&console_cdev, sch); |
1787 | if (ret) { | |
1788 | cio_release_console(); | |
1789 | console_cdev_in_use = 0; | |
1790 | return ERR_PTR(ret); | |
1791 | } | |
1792 | console_cdev.online = 1; | |
1793 | return &console_cdev; | |
1794 | } | |
1f4e7eda | 1795 | |
6664845c MS |
1796 | static int ccw_device_pm_restore(struct device *dev); |
1797 | ||
1798 | int ccw_device_force_console(void) | |
1799 | { | |
1800 | if (!console_cdev_in_use) | |
1801 | return -ENODEV; | |
1802 | return ccw_device_pm_restore(&console_cdev.dev); | |
1803 | } | |
1804 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1805 | #endif |
1806 | ||
1807 | /* | |
1808 | * get ccw_device matching the busid, but only if owned by cdrv | |
1809 | */ | |
b0744bd2 CH |
1810 | static int |
1811 | __ccwdev_check_busid(struct device *dev, void *id) | |
1812 | { | |
1813 | char *bus_id; | |
1814 | ||
12975aef | 1815 | bus_id = id; |
b0744bd2 | 1816 | |
98df67b3 | 1817 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1818 | } |
1819 | ||
1820 | ||
b2ffd8e9 CH |
1821 | /** |
1822 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1823 | * @cdrv: driver the device is owned by | |
1824 | * @bus_id: bus id of the device to be searched | |
1825 | * | |
1826 | * This function searches all devices owned by @cdrv for a device with a bus | |
1827 | * id matching @bus_id. | |
1828 | * Returns: | |
1829 | * If a match is found, its reference count of the found device is increased | |
1830 | * and it is returned; else %NULL is returned. | |
1831 | */ | |
1832 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1833 | const char *bus_id) | |
1da177e4 | 1834 | { |
b0744bd2 | 1835 | struct device *dev; |
1da177e4 LT |
1836 | struct device_driver *drv; |
1837 | ||
1838 | drv = get_driver(&cdrv->driver); | |
1839 | if (!drv) | |
b0744bd2 | 1840 | return NULL; |
1da177e4 | 1841 | |
b0744bd2 CH |
1842 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1843 | __ccwdev_check_busid); | |
1da177e4 LT |
1844 | put_driver(drv); |
1845 | ||
d2c993d8 | 1846 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1847 | } |
1848 | ||
1849 | /************************** device driver handling ************************/ | |
1850 | ||
1851 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1852 | * and release methods are initially very similar to the device_driver | |
1853 | * implementations, with the difference that they have ccw_device | |
1854 | * arguments. | |
1855 | * | |
1856 | * A ccw driver also contains the information that is needed for | |
1857 | * device matching. | |
1858 | */ | |
1859 | static int | |
1860 | ccw_device_probe (struct device *dev) | |
1861 | { | |
1862 | struct ccw_device *cdev = to_ccwdev(dev); | |
1863 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1864 | int ret; | |
1865 | ||
1866 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1867 | ||
1868 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1869 | ||
1870 | if (ret) { | |
d2c993d8 | 1871 | cdev->drv = NULL; |
1da177e4 LT |
1872 | return ret; |
1873 | } | |
1874 | ||
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | static int | |
1879 | ccw_device_remove (struct device *dev) | |
1880 | { | |
1881 | struct ccw_device *cdev = to_ccwdev(dev); | |
1882 | struct ccw_driver *cdrv = cdev->drv; | |
1883 | int ret; | |
1884 | ||
1da177e4 LT |
1885 | if (cdrv->remove) |
1886 | cdrv->remove(cdev); | |
1887 | if (cdev->online) { | |
1888 | cdev->online = 0; | |
1889 | spin_lock_irq(cdev->ccwlock); | |
1890 | ret = ccw_device_offline(cdev); | |
1891 | spin_unlock_irq(cdev->ccwlock); | |
1892 | if (ret == 0) | |
1893 | wait_event(cdev->private->wait_q, | |
1894 | dev_fsm_final_state(cdev)); | |
1895 | else | |
139b83dd | 1896 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1897 | "device 0.%x.%04x\n", |
1898 | ret, cdev->private->dev_id.ssid, | |
1899 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1900 | /* Give up reference obtained in ccw_device_set_online(). */ |
1901 | put_device(&cdev->dev); | |
1da177e4 LT |
1902 | } |
1903 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1904 | cdev->drv = NULL; |
1da177e4 LT |
1905 | return 0; |
1906 | } | |
1907 | ||
958974fb CH |
1908 | static void ccw_device_shutdown(struct device *dev) |
1909 | { | |
1910 | struct ccw_device *cdev; | |
1911 | ||
1912 | cdev = to_ccwdev(dev); | |
1913 | if (cdev->drv && cdev->drv->shutdown) | |
1914 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1915 | disable_cmf(cdev); |
958974fb CH |
1916 | } |
1917 | ||
823d494a SO |
1918 | static int ccw_device_pm_prepare(struct device *dev) |
1919 | { | |
1920 | struct ccw_device *cdev = to_ccwdev(dev); | |
1921 | ||
1922 | if (work_pending(&cdev->private->kick_work)) | |
1923 | return -EAGAIN; | |
1924 | /* Fail while device is being set online/offline. */ | |
1925 | if (atomic_read(&cdev->private->onoff)) | |
1926 | return -EAGAIN; | |
1927 | ||
1928 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1929 | return cdev->drv->prepare(cdev); | |
1930 | ||
1931 | return 0; | |
1932 | } | |
1933 | ||
1934 | static void ccw_device_pm_complete(struct device *dev) | |
1935 | { | |
1936 | struct ccw_device *cdev = to_ccwdev(dev); | |
1937 | ||
1938 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1939 | cdev->drv->complete(cdev); | |
1940 | } | |
1941 | ||
1942 | static int ccw_device_pm_freeze(struct device *dev) | |
1943 | { | |
1944 | struct ccw_device *cdev = to_ccwdev(dev); | |
1945 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1946 | int ret, cm_enabled; | |
1947 | ||
1948 | /* Fail suspend while device is in transistional state. */ | |
1949 | if (!dev_fsm_final_state(cdev)) | |
1950 | return -EAGAIN; | |
1951 | if (!cdev->online) | |
1952 | return 0; | |
1953 | if (cdev->drv && cdev->drv->freeze) { | |
1954 | ret = cdev->drv->freeze(cdev); | |
1955 | if (ret) | |
1956 | return ret; | |
1957 | } | |
1958 | ||
1959 | spin_lock_irq(sch->lock); | |
1960 | cm_enabled = cdev->private->cmb != NULL; | |
1961 | spin_unlock_irq(sch->lock); | |
1962 | if (cm_enabled) { | |
1963 | /* Don't have the css write on memory. */ | |
1964 | ret = ccw_set_cmf(cdev, 0); | |
1965 | if (ret) | |
1966 | return ret; | |
1967 | } | |
1968 | /* From here on, disallow device driver I/O. */ | |
1969 | spin_lock_irq(sch->lock); | |
1970 | ret = cio_disable_subchannel(sch); | |
1971 | spin_unlock_irq(sch->lock); | |
1972 | ||
1973 | return ret; | |
1974 | } | |
1975 | ||
1976 | static int ccw_device_pm_thaw(struct device *dev) | |
1977 | { | |
1978 | struct ccw_device *cdev = to_ccwdev(dev); | |
1979 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1980 | int ret, cm_enabled; | |
1981 | ||
1982 | if (!cdev->online) | |
1983 | return 0; | |
1984 | ||
1985 | spin_lock_irq(sch->lock); | |
1986 | /* Allow device driver I/O again. */ | |
1987 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1988 | cm_enabled = cdev->private->cmb != NULL; | |
1989 | spin_unlock_irq(sch->lock); | |
1990 | if (ret) | |
1991 | return ret; | |
1992 | ||
1993 | if (cm_enabled) { | |
1994 | ret = ccw_set_cmf(cdev, 1); | |
1995 | if (ret) | |
1996 | return ret; | |
1997 | } | |
1998 | ||
1999 | if (cdev->drv && cdev->drv->thaw) | |
2000 | ret = cdev->drv->thaw(cdev); | |
2001 | ||
2002 | return ret; | |
2003 | } | |
2004 | ||
2005 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
2006 | { | |
2007 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2008 | int ret; | |
2009 | ||
2010 | if (cio_is_console(sch->schid)) | |
2011 | goto out; | |
2012 | /* | |
2013 | * While we were sleeping, devices may have gone or become | |
2014 | * available again. Kick re-detection. | |
2015 | */ | |
2016 | spin_lock_irq(sch->lock); | |
2017 | cdev->private->flags.resuming = 1; | |
2018 | ret = ccw_device_recognition(cdev); | |
2019 | spin_unlock_irq(sch->lock); | |
2020 | if (ret) { | |
2021 | CIO_MSG_EVENT(0, "Couldn't start recognition for device " | |
f014824e SO |
2022 | "0.%x.%04x (ret=%d)\n", |
2023 | cdev->private->dev_id.ssid, | |
2024 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
2025 | spin_lock_irq(sch->lock); |
2026 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
2027 | spin_unlock_irq(sch->lock); | |
2028 | /* notify driver after the resume cb */ | |
2029 | goto out; | |
2030 | } | |
2031 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || | |
2032 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
2033 | ||
2034 | out: | |
2035 | cdev->private->flags.resuming = 0; | |
2036 | } | |
2037 | ||
2038 | static int resume_handle_boxed(struct ccw_device *cdev) | |
2039 | { | |
2040 | cdev->private->state = DEV_STATE_BOXED; | |
2041 | if (ccw_device_notify(cdev, CIO_BOXED)) | |
2042 | return 0; | |
2043 | ccw_device_schedule_sch_unregister(cdev); | |
2044 | return -ENODEV; | |
2045 | } | |
2046 | ||
2047 | static int resume_handle_disc(struct ccw_device *cdev) | |
2048 | { | |
2049 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
2050 | if (ccw_device_notify(cdev, CIO_GONE)) | |
2051 | return 0; | |
2052 | ccw_device_schedule_sch_unregister(cdev); | |
2053 | return -ENODEV; | |
2054 | } | |
2055 | ||
2056 | static int ccw_device_pm_restore(struct device *dev) | |
2057 | { | |
2058 | struct ccw_device *cdev = to_ccwdev(dev); | |
2059 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2060 | int ret = 0, cm_enabled; | |
2061 | ||
2062 | __ccw_device_pm_restore(cdev); | |
2063 | spin_lock_irq(sch->lock); | |
2064 | if (cio_is_console(sch->schid)) { | |
2065 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
2066 | spin_unlock_irq(sch->lock); | |
2067 | goto out_restore; | |
2068 | } | |
2069 | cdev->private->flags.donotify = 0; | |
2070 | /* check recognition results */ | |
2071 | switch (cdev->private->state) { | |
2072 | case DEV_STATE_OFFLINE: | |
2073 | break; | |
2074 | case DEV_STATE_BOXED: | |
2075 | ret = resume_handle_boxed(cdev); | |
2076 | spin_unlock_irq(sch->lock); | |
2077 | if (ret) | |
2078 | goto out; | |
2079 | goto out_restore; | |
2080 | case DEV_STATE_DISCONNECTED: | |
2081 | goto out_disc_unlock; | |
2082 | default: | |
2083 | goto out_unreg_unlock; | |
2084 | } | |
2085 | /* check if the device id has changed */ | |
2086 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
f014824e SO |
2087 | CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno " |
2088 | "changed from %04x to %04x)\n", | |
2089 | sch->schid.ssid, sch->schid.sch_no, | |
823d494a SO |
2090 | cdev->private->dev_id.devno, |
2091 | sch->schib.pmcw.dev); | |
2092 | goto out_unreg_unlock; | |
2093 | } | |
2094 | /* check if the device type has changed */ | |
2095 | if (!ccw_device_test_sense_data(cdev)) { | |
2096 | ccw_device_update_sense_data(cdev); | |
2097 | PREPARE_WORK(&cdev->private->kick_work, | |
2098 | ccw_device_do_unbind_bind); | |
2099 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
2100 | ret = -ENODEV; | |
2101 | goto out_unlock; | |
2102 | } | |
2103 | if (!cdev->online) { | |
2104 | ret = 0; | |
2105 | goto out_unlock; | |
2106 | } | |
2107 | ret = ccw_device_online(cdev); | |
2108 | if (ret) | |
2109 | goto out_disc_unlock; | |
2110 | ||
2111 | cm_enabled = cdev->private->cmb != NULL; | |
2112 | spin_unlock_irq(sch->lock); | |
2113 | ||
2114 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
2115 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
2116 | spin_lock_irq(sch->lock); | |
2117 | goto out_disc_unlock; | |
2118 | } | |
2119 | if (cm_enabled) { | |
2120 | ret = ccw_set_cmf(cdev, 1); | |
2121 | if (ret) { | |
f014824e SO |
2122 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
2123 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
2124 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
2125 | ret = 0; |
2126 | } | |
2127 | } | |
2128 | ||
2129 | out_restore: | |
2130 | if (cdev->online && cdev->drv && cdev->drv->restore) | |
2131 | ret = cdev->drv->restore(cdev); | |
2132 | out: | |
2133 | return ret; | |
2134 | ||
2135 | out_disc_unlock: | |
2136 | ret = resume_handle_disc(cdev); | |
2137 | spin_unlock_irq(sch->lock); | |
2138 | if (ret) | |
2139 | return ret; | |
2140 | goto out_restore; | |
2141 | ||
2142 | out_unreg_unlock: | |
2143 | ccw_device_schedule_sch_unregister(cdev); | |
2144 | ret = -ENODEV; | |
2145 | out_unlock: | |
2146 | spin_unlock_irq(sch->lock); | |
2147 | return ret; | |
2148 | } | |
2149 | ||
2150 | static struct dev_pm_ops ccw_pm_ops = { | |
2151 | .prepare = ccw_device_pm_prepare, | |
2152 | .complete = ccw_device_pm_complete, | |
2153 | .freeze = ccw_device_pm_freeze, | |
2154 | .thaw = ccw_device_pm_thaw, | |
2155 | .restore = ccw_device_pm_restore, | |
2156 | }; | |
2157 | ||
8bbace7e CH |
2158 | struct bus_type ccw_bus_type = { |
2159 | .name = "ccw", | |
2160 | .match = ccw_bus_match, | |
2161 | .uevent = ccw_uevent, | |
2162 | .probe = ccw_device_probe, | |
2163 | .remove = ccw_device_remove, | |
958974fb | 2164 | .shutdown = ccw_device_shutdown, |
823d494a | 2165 | .pm = &ccw_pm_ops, |
8bbace7e CH |
2166 | }; |
2167 | ||
b2ffd8e9 CH |
2168 | /** |
2169 | * ccw_driver_register() - register a ccw driver | |
2170 | * @cdriver: driver to be registered | |
2171 | * | |
2172 | * This function is mainly a wrapper around driver_register(). | |
2173 | * Returns: | |
2174 | * %0 on success and a negative error value on failure. | |
2175 | */ | |
2176 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2177 | { |
2178 | struct device_driver *drv = &cdriver->driver; | |
2179 | ||
2180 | drv->bus = &ccw_bus_type; | |
2181 | drv->name = cdriver->name; | |
4beee646 | 2182 | drv->owner = cdriver->owner; |
1da177e4 LT |
2183 | |
2184 | return driver_register(drv); | |
2185 | } | |
2186 | ||
b2ffd8e9 CH |
2187 | /** |
2188 | * ccw_driver_unregister() - deregister a ccw driver | |
2189 | * @cdriver: driver to be deregistered | |
2190 | * | |
2191 | * This function is mainly a wrapper around driver_unregister(). | |
2192 | */ | |
2193 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2194 | { |
2195 | driver_unregister(&cdriver->driver); | |
2196 | } | |
2197 | ||
a8237fc4 CH |
2198 | /* Helper func for qdio. */ |
2199 | struct subchannel_id | |
2200 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
2201 | { | |
2202 | struct subchannel *sch; | |
2203 | ||
2204 | sch = to_subchannel(cdev->dev.parent); | |
2205 | return sch->schid; | |
2206 | } | |
2207 | ||
1da177e4 LT |
2208 | MODULE_LICENSE("GPL"); |
2209 | EXPORT_SYMBOL(ccw_device_set_online); | |
2210 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2211 | EXPORT_SYMBOL(ccw_driver_register); | |
2212 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2213 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
2214 | EXPORT_SYMBOL(ccw_bus_type); | |
2215 | EXPORT_SYMBOL(ccw_device_work); | |
a8237fc4 | 2216 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |