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); | |
1da177e4 | 134 | |
f08adc00 CH |
135 | static struct css_device_id io_subchannel_ids[] = { |
136 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
137 | { /* end of list */ }, | |
138 | }; | |
139 | MODULE_DEVICE_TABLE(css, io_subchannel_ids); | |
140 | ||
93a27592 CH |
141 | static int io_subchannel_prepare(struct subchannel *sch) |
142 | { | |
143 | struct ccw_device *cdev; | |
144 | /* | |
145 | * Don't allow suspend while a ccw device registration | |
146 | * is still outstanding. | |
147 | */ | |
148 | cdev = sch_get_cdev(sch); | |
149 | if (cdev && !device_is_registered(&cdev->dev)) | |
150 | return -EAGAIN; | |
151 | return 0; | |
152 | } | |
153 | ||
f7e5d67c | 154 | static struct css_driver io_subchannel_driver = { |
4beee646 | 155 | .owner = THIS_MODULE, |
f08adc00 | 156 | .subchannel_type = io_subchannel_ids, |
25b7bb58 | 157 | .name = "io_subchannel", |
1da177e4 | 158 | .irq = io_subchannel_irq, |
c820de39 CH |
159 | .sch_event = io_subchannel_sch_event, |
160 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
161 | .probe = io_subchannel_probe, |
162 | .remove = io_subchannel_remove, | |
163 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 164 | .prepare = io_subchannel_prepare, |
1da177e4 LT |
165 | }; |
166 | ||
167 | struct workqueue_struct *ccw_device_work; | |
40154b82 PO |
168 | wait_queue_head_t ccw_device_init_wq; |
169 | atomic_t ccw_device_init_count; | |
1da177e4 | 170 | |
90ab1336 PO |
171 | static void recovery_func(unsigned long data); |
172 | ||
1da177e4 LT |
173 | static int __init |
174 | init_ccw_bus_type (void) | |
175 | { | |
176 | int ret; | |
177 | ||
178 | init_waitqueue_head(&ccw_device_init_wq); | |
179 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 180 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 LT |
181 | |
182 | ccw_device_work = create_singlethread_workqueue("cio"); | |
183 | if (!ccw_device_work) | |
184 | return -ENOMEM; /* FIXME: better errno ? */ | |
1da177e4 LT |
185 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); |
186 | if (!slow_path_wq) { | |
187 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
188 | goto out_err; | |
189 | } | |
190 | if ((ret = bus_register (&ccw_bus_type))) | |
191 | goto out_err; | |
192 | ||
25b7bb58 CH |
193 | ret = css_driver_register(&io_subchannel_driver); |
194 | if (ret) | |
1da177e4 LT |
195 | goto out_err; |
196 | ||
197 | wait_event(ccw_device_init_wq, | |
198 | atomic_read(&ccw_device_init_count) == 0); | |
199 | flush_workqueue(ccw_device_work); | |
200 | return 0; | |
201 | out_err: | |
202 | if (ccw_device_work) | |
203 | destroy_workqueue(ccw_device_work); | |
1da177e4 LT |
204 | if (slow_path_wq) |
205 | destroy_workqueue(slow_path_wq); | |
206 | return ret; | |
207 | } | |
208 | ||
209 | static void __exit | |
210 | cleanup_ccw_bus_type (void) | |
211 | { | |
25b7bb58 | 212 | css_driver_unregister(&io_subchannel_driver); |
1da177e4 | 213 | bus_unregister(&ccw_bus_type); |
1da177e4 LT |
214 | destroy_workqueue(ccw_device_work); |
215 | } | |
216 | ||
217 | subsys_initcall(init_ccw_bus_type); | |
218 | module_exit(cleanup_ccw_bus_type); | |
219 | ||
220 | /************************ device handling **************************/ | |
221 | ||
222 | /* | |
223 | * A ccw_device has some interfaces in sysfs in addition to the | |
224 | * standard ones. | |
225 | * The following entries are designed to export the information which | |
226 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
227 | * are obvious, so they don't have an entry :) | |
228 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
229 | */ | |
230 | static ssize_t | |
3fd3c0a5 | 231 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
232 | { |
233 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 234 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
235 | ssize_t ret = 0; |
236 | int chp; | |
7ad6a249 PO |
237 | int mask; |
238 | ||
239 | for (chp = 0; chp < 8; chp++) { | |
240 | mask = 0x80 >> chp; | |
241 | if (ssd->path_mask & mask) | |
242 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
243 | else | |
244 | ret += sprintf(buf + ret, "00 "); | |
245 | } | |
1da177e4 LT |
246 | ret += sprintf (buf+ret, "\n"); |
247 | return min((ssize_t)PAGE_SIZE, ret); | |
248 | } | |
249 | ||
250 | static ssize_t | |
3fd3c0a5 | 251 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
252 | { |
253 | struct subchannel *sch = to_subchannel(dev); | |
254 | struct pmcw *pmcw = &sch->schib.pmcw; | |
255 | ||
256 | return sprintf (buf, "%02x %02x %02x\n", | |
257 | pmcw->pim, pmcw->pam, pmcw->pom); | |
258 | } | |
259 | ||
260 | static ssize_t | |
3fd3c0a5 | 261 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
262 | { |
263 | struct ccw_device *cdev = to_ccwdev(dev); | |
264 | struct ccw_device_id *id = &(cdev->id); | |
265 | ||
266 | if (id->dev_type != 0) | |
267 | return sprintf(buf, "%04x/%02x\n", | |
268 | id->dev_type, id->dev_model); | |
269 | else | |
270 | return sprintf(buf, "n/a\n"); | |
271 | } | |
272 | ||
273 | static ssize_t | |
3fd3c0a5 | 274 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
275 | { |
276 | struct ccw_device *cdev = to_ccwdev(dev); | |
277 | struct ccw_device_id *id = &(cdev->id); | |
278 | ||
279 | return sprintf(buf, "%04x/%02x\n", | |
280 | id->cu_type, id->cu_model); | |
281 | } | |
282 | ||
f1fc78a8 BB |
283 | static ssize_t |
284 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
285 | { | |
286 | struct ccw_device *cdev = to_ccwdev(dev); | |
287 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 288 | int len; |
f1fc78a8 | 289 | |
086a6c62 | 290 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
291 | |
292 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
293 | } |
294 | ||
1da177e4 | 295 | static ssize_t |
3fd3c0a5 | 296 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
297 | { |
298 | struct ccw_device *cdev = to_ccwdev(dev); | |
299 | ||
300 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
301 | } | |
302 | ||
d7b5a4c9 CH |
303 | int ccw_device_is_orphan(struct ccw_device *cdev) |
304 | { | |
305 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
306 | } | |
307 | ||
ef99516c | 308 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 309 | { |
3b554a14 | 310 | if (test_and_clear_bit(1, &cdev->private->registered)) { |
ef99516c | 311 | device_del(&cdev->dev); |
3b554a14 SO |
312 | /* Release reference from device_initialize(). */ |
313 | put_device(&cdev->dev); | |
314 | } | |
7674da77 CH |
315 | } |
316 | ||
46fbe4e4 | 317 | static void ccw_device_remove_orphan_cb(struct work_struct *work) |
59a8a6e2 | 318 | { |
46fbe4e4 PO |
319 | struct ccw_device_private *priv; |
320 | struct ccw_device *cdev; | |
59a8a6e2 | 321 | |
46fbe4e4 PO |
322 | priv = container_of(work, struct ccw_device_private, kick_work); |
323 | cdev = priv->cdev; | |
59a8a6e2 | 324 | ccw_device_unregister(cdev); |
46fbe4e4 PO |
325 | /* Release cdev reference for workqueue processing. */ |
326 | put_device(&cdev->dev); | |
59a8a6e2 CH |
327 | } |
328 | ||
1da177e4 LT |
329 | static void |
330 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
331 | { | |
d7b5a4c9 | 332 | unsigned long flags; |
59a8a6e2 | 333 | |
1da177e4 LT |
334 | /* |
335 | * Forced offline in disconnected state means | |
336 | * 'throw away device'. | |
337 | */ | |
d7b5a4c9 | 338 | if (ccw_device_is_orphan(cdev)) { |
59a8a6e2 CH |
339 | /* |
340 | * Deregister ccw device. | |
341 | * Unfortunately, we cannot do this directly from the | |
342 | * attribute method. | |
343 | */ | |
be7a2ddc SO |
344 | /* Get cdev reference for workqueue processing. */ |
345 | if (!get_device(&cdev->dev)) | |
346 | return; | |
d7b5a4c9 CH |
347 | spin_lock_irqsave(cdev->ccwlock, flags); |
348 | cdev->private->state = DEV_STATE_NOT_OPER; | |
349 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
46fbe4e4 PO |
350 | PREPARE_WORK(&cdev->private->kick_work, |
351 | ccw_device_remove_orphan_cb); | |
c4621a62 | 352 | queue_work(slow_path_wq, &cdev->private->kick_work); |
46fbe4e4 PO |
353 | } else |
354 | /* Deregister subchannel, which will kill the ccw device. */ | |
c4621a62 | 355 | ccw_device_schedule_sch_unregister(cdev); |
1da177e4 LT |
356 | } |
357 | ||
b2ffd8e9 CH |
358 | /** |
359 | * ccw_device_set_offline() - disable a ccw device for I/O | |
360 | * @cdev: target ccw device | |
361 | * | |
362 | * This function calls the driver's set_offline() function for @cdev, if | |
363 | * given, and then disables @cdev. | |
364 | * Returns: | |
365 | * %0 on success and a negative error value on failure. | |
366 | * Context: | |
367 | * enabled, ccw device lock not held | |
368 | */ | |
369 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 LT |
370 | { |
371 | int ret; | |
372 | ||
373 | if (!cdev) | |
374 | return -ENODEV; | |
375 | if (!cdev->online || !cdev->drv) | |
376 | return -EINVAL; | |
377 | ||
378 | if (cdev->drv->set_offline) { | |
379 | ret = cdev->drv->set_offline(cdev); | |
380 | if (ret != 0) | |
381 | return ret; | |
382 | } | |
383 | cdev->online = 0; | |
384 | spin_lock_irq(cdev->ccwlock); | |
217ee6c6 ME |
385 | /* Wait until a final state or DISCONNECTED is reached */ |
386 | while (!dev_fsm_final_state(cdev) && | |
387 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
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 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 392 | } |
217ee6c6 ME |
393 | ret = ccw_device_offline(cdev); |
394 | if (ret) | |
395 | goto error; | |
1da177e4 | 396 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
397 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
398 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
399 | /* Give up reference from ccw_device_set_online(). */ | |
400 | put_device(&cdev->dev); | |
401 | return 0; | |
402 | ||
403 | error: | |
404 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n", | |
405 | ret, cdev->private->dev_id.ssid, | |
406 | cdev->private->dev_id.devno); | |
407 | cdev->private->state = DEV_STATE_OFFLINE; | |
408 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
409 | spin_unlock_irq(cdev->ccwlock); | |
410 | /* Give up reference from ccw_device_set_online(). */ | |
411 | put_device(&cdev->dev); | |
412 | return -ENODEV; | |
1da177e4 LT |
413 | } |
414 | ||
b2ffd8e9 CH |
415 | /** |
416 | * ccw_device_set_online() - enable a ccw device for I/O | |
417 | * @cdev: target ccw device | |
418 | * | |
419 | * This function first enables @cdev and then calls the driver's set_online() | |
420 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
421 | * disabled again. | |
422 | * Returns: | |
423 | * %0 on success and a negative error value on failure. | |
424 | * Context: | |
425 | * enabled, ccw device lock not held | |
426 | */ | |
427 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
428 | { |
429 | int ret; | |
217ee6c6 | 430 | int ret2; |
1da177e4 LT |
431 | |
432 | if (!cdev) | |
433 | return -ENODEV; | |
434 | if (cdev->online || !cdev->drv) | |
435 | return -EINVAL; | |
9cd67421 CH |
436 | /* Hold on to an extra reference while device is online. */ |
437 | if (!get_device(&cdev->dev)) | |
438 | return -ENODEV; | |
1da177e4 LT |
439 | |
440 | spin_lock_irq(cdev->ccwlock); | |
441 | ret = ccw_device_online(cdev); | |
442 | spin_unlock_irq(cdev->ccwlock); | |
443 | if (ret == 0) | |
444 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
445 | else { | |
139b83dd | 446 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
447 | "device 0.%x.%04x\n", |
448 | ret, cdev->private->dev_id.ssid, | |
449 | cdev->private->dev_id.devno); | |
9cd67421 CH |
450 | /* Give up online reference since onlining failed. */ |
451 | put_device(&cdev->dev); | |
1da177e4 LT |
452 | return ret; |
453 | } | |
217ee6c6 ME |
454 | spin_lock_irq(cdev->ccwlock); |
455 | /* Check if online processing was successful */ | |
456 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
457 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
458 | spin_unlock_irq(cdev->ccwlock); | |
9cd67421 CH |
459 | /* Give up online reference since onlining failed. */ |
460 | put_device(&cdev->dev); | |
1da177e4 | 461 | return -ENODEV; |
9cd67421 | 462 | } |
217ee6c6 ME |
463 | spin_unlock_irq(cdev->ccwlock); |
464 | if (cdev->drv->set_online) | |
465 | ret = cdev->drv->set_online(cdev); | |
466 | if (ret) | |
467 | goto rollback; | |
468 | cdev->online = 1; | |
469 | return 0; | |
470 | ||
471 | rollback: | |
1da177e4 | 472 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
473 | /* Wait until a final state or DISCONNECTED is reached */ |
474 | while (!dev_fsm_final_state(cdev) && | |
475 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
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 | spin_lock_irq(cdev->ccwlock); | |
480 | } | |
481 | ret2 = ccw_device_offline(cdev); | |
482 | if (ret2) | |
483 | goto error; | |
484 | spin_unlock_irq(cdev->ccwlock); | |
485 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
486 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
487 | /* Give up online reference since onlining failed. */ | |
488 | put_device(&cdev->dev); | |
489 | return ret; | |
490 | ||
491 | error: | |
492 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
493 | "device 0.%x.%04x\n", | |
494 | ret2, cdev->private->dev_id.ssid, | |
495 | cdev->private->dev_id.devno); | |
496 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 497 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
498 | /* Give up online reference since onlining failed. */ |
499 | put_device(&cdev->dev); | |
217ee6c6 | 500 | return ret; |
1da177e4 LT |
501 | } |
502 | ||
e74fe0ce | 503 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 CH |
504 | { |
505 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
506 | ccw_device_remove_disconnected(cdev); | |
e74fe0ce SO |
507 | else if (cdev->online && cdev->drv && cdev->drv->set_offline) |
508 | return ccw_device_set_offline(cdev); | |
509 | return 0; | |
f5ba6c86 CH |
510 | } |
511 | ||
512 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
513 | { | |
514 | int ret; | |
515 | ||
516 | /* Do device recognition, if needed. */ | |
99f6a570 | 517 | if (cdev->private->state == DEV_STATE_BOXED) { |
f5ba6c86 CH |
518 | ret = ccw_device_recognition(cdev); |
519 | if (ret) { | |
e556bbbd CH |
520 | CIO_MSG_EVENT(0, "Couldn't start recognition " |
521 | "for device 0.%x.%04x (ret=%d)\n", | |
522 | cdev->private->dev_id.ssid, | |
523 | cdev->private->dev_id.devno, ret); | |
f5ba6c86 CH |
524 | return ret; |
525 | } | |
526 | wait_event(cdev->private->wait_q, | |
527 | cdev->private->flags.recog_done); | |
156013ff SO |
528 | if (cdev->private->state != DEV_STATE_OFFLINE) |
529 | /* recognition failed */ | |
530 | return -EAGAIN; | |
f5ba6c86 CH |
531 | } |
532 | if (cdev->drv && cdev->drv->set_online) | |
533 | ccw_device_set_online(cdev); | |
534 | return 0; | |
535 | } | |
156013ff | 536 | |
c78aa6cb | 537 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
538 | { |
539 | int ret; | |
540 | ||
541 | ret = online_store_recog_and_online(cdev); | |
156013ff | 542 | if (ret && !force) |
c78aa6cb | 543 | return ret; |
f5ba6c86 CH |
544 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
545 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
546 | if (ret) |
547 | return ret; | |
f5ba6c86 CH |
548 | if (cdev->id.cu_type == 0) |
549 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
550 | ret = online_store_recog_and_online(cdev); |
551 | if (ret) | |
552 | return ret; | |
f5ba6c86 | 553 | } |
c78aa6cb | 554 | return 0; |
f5ba6c86 CH |
555 | } |
556 | ||
557 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
558 | const char *buf, size_t count) | |
1da177e4 LT |
559 | { |
560 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
561 | int force, ret; |
562 | unsigned long i; | |
1da177e4 | 563 | |
b5cd99e6 SO |
564 | if ((cdev->private->state != DEV_STATE_OFFLINE && |
565 | cdev->private->state != DEV_STATE_ONLINE && | |
566 | cdev->private->state != DEV_STATE_BOXED && | |
567 | cdev->private->state != DEV_STATE_DISCONNECTED) || | |
568 | atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) | |
1da177e4 LT |
569 | return -EAGAIN; |
570 | ||
571 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
572 | atomic_set(&cdev->private->onoff, 0); | |
573 | return -EINVAL; | |
574 | } | |
575 | if (!strncmp(buf, "force\n", count)) { | |
576 | force = 1; | |
577 | i = 1; | |
2f972202 | 578 | ret = 0; |
1da177e4 LT |
579 | } else { |
580 | force = 0; | |
2f972202 | 581 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 582 | } |
2f972202 CH |
583 | if (ret) |
584 | goto out; | |
f5ba6c86 CH |
585 | switch (i) { |
586 | case 0: | |
e74fe0ce | 587 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
588 | break; |
589 | case 1: | |
c78aa6cb | 590 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
591 | break; |
592 | default: | |
2f972202 | 593 | ret = -EINVAL; |
1da177e4 | 594 | } |
2f972202 | 595 | out: |
1da177e4 LT |
596 | if (cdev->drv) |
597 | module_put(cdev->drv->owner); | |
598 | atomic_set(&cdev->private->onoff, 0); | |
e74fe0ce | 599 | return (ret < 0) ? ret : count; |
1da177e4 LT |
600 | } |
601 | ||
602 | static ssize_t | |
3fd3c0a5 | 603 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
604 | { |
605 | struct ccw_device *cdev = to_ccwdev(dev); | |
606 | struct subchannel *sch; | |
607 | ||
d7b5a4c9 CH |
608 | if (ccw_device_is_orphan(cdev)) |
609 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
610 | switch (cdev->private->state) { |
611 | case DEV_STATE_BOXED: | |
612 | return sprintf(buf, "boxed\n"); | |
613 | case DEV_STATE_DISCONNECTED: | |
614 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
615 | case DEV_STATE_NOT_OPER: | |
616 | sch = to_subchannel(dev->parent); | |
617 | if (!sch->lpm) | |
618 | return sprintf(buf, "no path\n"); | |
619 | else | |
620 | return sprintf(buf, "no device\n"); | |
621 | default: | |
622 | /* All other states considered fine. */ | |
623 | return sprintf(buf, "good\n"); | |
624 | } | |
625 | } | |
626 | ||
627 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
628 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
629 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
630 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 631 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 632 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
633 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
634 | ||
7e9db9ea | 635 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
636 | &dev_attr_chpids.attr, |
637 | &dev_attr_pimpampom.attr, | |
638 | NULL, | |
639 | }; | |
640 | ||
7e9db9ea CH |
641 | static struct attribute_group io_subchannel_attr_group = { |
642 | .attrs = io_subchannel_attrs, | |
529192f3 | 643 | }; |
1da177e4 LT |
644 | |
645 | static struct attribute * ccwdev_attrs[] = { | |
646 | &dev_attr_devtype.attr, | |
647 | &dev_attr_cutype.attr, | |
f1fc78a8 | 648 | &dev_attr_modalias.attr, |
1da177e4 LT |
649 | &dev_attr_online.attr, |
650 | &dev_attr_cmb_enable.attr, | |
651 | &dev_attr_availability.attr, | |
652 | NULL, | |
653 | }; | |
654 | ||
655 | static struct attribute_group ccwdev_attr_group = { | |
656 | .attrs = ccwdev_attrs, | |
657 | }; | |
658 | ||
a4dbd674 | 659 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
660 | &ccwdev_attr_group, |
661 | NULL, | |
662 | }; | |
1da177e4 LT |
663 | |
664 | /* this is a simple abstraction for device_register that sets the | |
665 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 666 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
667 | { |
668 | struct device *dev = &cdev->dev; | |
669 | int ret; | |
670 | ||
671 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
672 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
673 | cdev->private->dev_id.devno); | |
674 | if (ret) | |
675 | return ret; | |
676 | ret = device_add(dev); | |
677 | if (ret) | |
1da177e4 LT |
678 | return ret; |
679 | ||
680 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
681 | return ret; |
682 | } | |
683 | ||
b0744bd2 | 684 | struct match_data { |
78964268 | 685 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
686 | struct ccw_device * sibling; |
687 | }; | |
688 | ||
689 | static int | |
690 | match_devno(struct device * dev, void * data) | |
691 | { | |
78964268 | 692 | struct match_data * d = data; |
b0744bd2 CH |
693 | struct ccw_device * cdev; |
694 | ||
695 | cdev = to_ccwdev(dev); | |
696 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 697 | !ccw_device_is_orphan(cdev) && |
78964268 | 698 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 699 | (cdev != d->sibling)) |
b0744bd2 | 700 | return 1; |
b0744bd2 CH |
701 | return 0; |
702 | } | |
703 | ||
78964268 CH |
704 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
705 | struct ccw_device *sibling) | |
1da177e4 | 706 | { |
1da177e4 | 707 | struct device *dev; |
292888c8 | 708 | struct match_data data; |
1da177e4 | 709 | |
78964268 | 710 | data.dev_id = *dev_id; |
292888c8 | 711 | data.sibling = sibling; |
e5945b4f | 712 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 713 | |
b0744bd2 | 714 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
715 | } |
716 | ||
d7b5a4c9 CH |
717 | static int match_orphan(struct device *dev, void *data) |
718 | { | |
719 | struct ccw_dev_id *dev_id; | |
720 | struct ccw_device *cdev; | |
721 | ||
722 | dev_id = data; | |
723 | cdev = to_ccwdev(dev); | |
724 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
725 | } | |
726 | ||
727 | static struct ccw_device * | |
728 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
729 | struct ccw_dev_id *dev_id) | |
730 | { | |
731 | struct device *dev; | |
732 | ||
733 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
734 | match_orphan); | |
735 | ||
736 | return dev ? to_ccwdev(dev) : NULL; | |
737 | } | |
738 | ||
eb32ae8d | 739 | void ccw_device_do_unbind_bind(struct work_struct *work) |
1da177e4 | 740 | { |
c1637532 | 741 | struct ccw_device_private *priv; |
1da177e4 LT |
742 | struct ccw_device *cdev; |
743 | struct subchannel *sch; | |
eb32ae8d | 744 | int ret; |
1da177e4 | 745 | |
c1637532 MS |
746 | priv = container_of(work, struct ccw_device_private, kick_work); |
747 | cdev = priv->cdev; | |
1da177e4 | 748 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 749 | |
eb32ae8d CH |
750 | if (test_bit(1, &cdev->private->registered)) { |
751 | device_release_driver(&cdev->dev); | |
752 | ret = device_attach(&cdev->dev); | |
753 | WARN_ON(ret == -ENODEV); | |
754 | } | |
1da177e4 LT |
755 | } |
756 | ||
757 | static void | |
758 | ccw_device_release(struct device *dev) | |
759 | { | |
760 | struct ccw_device *cdev; | |
761 | ||
762 | cdev = to_ccwdev(dev); | |
6eff208f CH |
763 | /* Release reference of parent subchannel. */ |
764 | put_device(cdev->dev.parent); | |
1da177e4 LT |
765 | kfree(cdev->private); |
766 | kfree(cdev); | |
767 | } | |
768 | ||
7674da77 CH |
769 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
770 | { | |
771 | struct ccw_device *cdev; | |
772 | ||
773 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
774 | if (cdev) { | |
775 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
776 | GFP_KERNEL | GFP_DMA); | |
777 | if (cdev->private) | |
778 | return cdev; | |
779 | } | |
780 | kfree(cdev); | |
781 | return ERR_PTR(-ENOMEM); | |
782 | } | |
783 | ||
784 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
785 | struct ccw_device *cdev) | |
786 | { | |
787 | cdev->private->cdev = cdev; | |
788 | atomic_set(&cdev->private->onoff, 0); | |
789 | cdev->dev.parent = &sch->dev; | |
790 | cdev->dev.release = ccw_device_release; | |
33583c36 | 791 | INIT_WORK(&cdev->private->kick_work, NULL); |
ef99516c | 792 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
793 | /* Do first half of device_register. */ |
794 | device_initialize(&cdev->dev); | |
795 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
796 | /* Release reference from device_initialize(). */ |
797 | put_device(&cdev->dev); | |
7674da77 CH |
798 | return -ENODEV; |
799 | } | |
800 | return 0; | |
801 | } | |
802 | ||
803 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
804 | { | |
805 | struct ccw_device *cdev; | |
806 | int ret; | |
807 | ||
808 | cdev = io_subchannel_allocate_dev(sch); | |
809 | if (!IS_ERR(cdev)) { | |
810 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 811 | if (ret) |
7674da77 | 812 | cdev = ERR_PTR(ret); |
7674da77 CH |
813 | } |
814 | return cdev; | |
815 | } | |
816 | ||
d7b5a4c9 CH |
817 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
818 | ||
819 | static void sch_attach_device(struct subchannel *sch, | |
820 | struct ccw_device *cdev) | |
821 | { | |
82b7ac05 | 822 | css_update_ssd_info(sch); |
d7b5a4c9 | 823 | spin_lock_irq(sch->lock); |
db6a6423 | 824 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
825 | cdev->private->schid = sch->schid; |
826 | cdev->ccwlock = sch->lock; | |
c820de39 | 827 | ccw_device_trigger_reprobe(cdev); |
d7b5a4c9 CH |
828 | spin_unlock_irq(sch->lock); |
829 | } | |
830 | ||
831 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
832 | struct ccw_device *cdev) | |
833 | { | |
834 | struct subchannel *other_sch; | |
835 | int ret; | |
836 | ||
6eff208f CH |
837 | /* Get reference for new parent. */ |
838 | if (!get_device(&sch->dev)) | |
839 | return; | |
840 | other_sch = to_subchannel(cdev->dev.parent); | |
841 | /* Note: device_move() changes cdev->dev.parent */ | |
ffa6a705 | 842 | ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 | 843 | if (ret) { |
139b83dd | 844 | CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed " |
d7b5a4c9 CH |
845 | "(ret=%d)!\n", cdev->private->dev_id.ssid, |
846 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
847 | /* Put reference for new parent. */ |
848 | put_device(&sch->dev); | |
d7b5a4c9 CH |
849 | return; |
850 | } | |
db6a6423 | 851 | sch_set_cdev(other_sch, NULL); |
d7b5a4c9 CH |
852 | /* No need to keep a subchannel without ccw device around. */ |
853 | css_sch_device_unregister(other_sch); | |
d7b5a4c9 | 854 | sch_attach_device(sch, cdev); |
6eff208f CH |
855 | /* Put reference for old parent. */ |
856 | put_device(&other_sch->dev); | |
d7b5a4c9 CH |
857 | } |
858 | ||
859 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
860 | struct ccw_device *cdev) | |
861 | { | |
862 | int ret; | |
6eff208f | 863 | struct subchannel *pseudo_sch; |
d7b5a4c9 | 864 | |
6eff208f CH |
865 | /* Get reference for new parent. */ |
866 | if (!get_device(&sch->dev)) | |
867 | return; | |
868 | pseudo_sch = to_subchannel(cdev->dev.parent); | |
869 | /* | |
870 | * Try to move the ccw device to its new subchannel. | |
871 | * Note: device_move() changes cdev->dev.parent | |
872 | */ | |
ffa6a705 | 873 | ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
874 | if (ret) { |
875 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
876 | "failed (ret=%d)!\n", | |
877 | cdev->private->dev_id.ssid, | |
878 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
879 | /* Put reference for new parent. */ |
880 | put_device(&sch->dev); | |
d7b5a4c9 CH |
881 | return; |
882 | } | |
883 | sch_attach_device(sch, cdev); | |
6eff208f CH |
884 | /* Put reference on pseudo subchannel. */ |
885 | put_device(&pseudo_sch->dev); | |
d7b5a4c9 CH |
886 | } |
887 | ||
888 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
889 | { | |
890 | struct ccw_device *cdev; | |
891 | ||
892 | /* Need to allocate a new ccw device. */ | |
893 | cdev = io_subchannel_create_ccwdev(sch); | |
894 | if (IS_ERR(cdev)) { | |
895 | /* OK, we did everything we could... */ | |
896 | css_sch_device_unregister(sch); | |
897 | return; | |
898 | } | |
899 | spin_lock_irq(sch->lock); | |
db6a6423 | 900 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
901 | spin_unlock_irq(sch->lock); |
902 | /* Start recognition for the new ccw device. */ | |
903 | if (io_subchannel_recog(cdev, sch)) { | |
904 | spin_lock_irq(sch->lock); | |
db6a6423 | 905 | sch_set_cdev(sch, NULL); |
d7b5a4c9 | 906 | spin_unlock_irq(sch->lock); |
d7b5a4c9 | 907 | css_sch_device_unregister(sch); |
6eff208f CH |
908 | /* Put reference from io_subchannel_create_ccwdev(). */ |
909 | put_device(&sch->dev); | |
910 | /* Give up initial reference. */ | |
911 | put_device(&cdev->dev); | |
d7b5a4c9 CH |
912 | } |
913 | } | |
914 | ||
915 | ||
916 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
917 | { | |
918 | struct ccw_device_private *priv; | |
919 | struct ccw_device *cdev; | |
920 | struct ccw_device *replacing_cdev; | |
921 | struct subchannel *sch; | |
922 | int ret; | |
923 | struct channel_subsystem *css; | |
924 | struct ccw_dev_id dev_id; | |
925 | ||
926 | priv = container_of(work, struct ccw_device_private, kick_work); | |
927 | cdev = priv->cdev; | |
928 | sch = to_subchannel(cdev->dev.parent); | |
929 | css = to_css(sch->dev.parent); | |
930 | dev_id.devno = sch->schib.pmcw.dev; | |
931 | dev_id.ssid = sch->schid.ssid; | |
932 | ||
6eff208f CH |
933 | /* Increase refcount for pseudo subchannel. */ |
934 | get_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 CH |
935 | /* |
936 | * Move the orphaned ccw device to the orphanage so the replacing | |
937 | * ccw device can take its place on the subchannel. | |
6eff208f | 938 | * Note: device_move() changes cdev->dev.parent |
d7b5a4c9 | 939 | */ |
ffa6a705 CH |
940 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev, |
941 | DPM_ORDER_NONE); | |
d7b5a4c9 CH |
942 | if (ret) { |
943 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
944 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
945 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
946 | /* Decrease refcount for pseudo subchannel again. */ |
947 | put_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 CH |
948 | return; |
949 | } | |
950 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
951 | /* | |
952 | * Search for the replacing ccw device | |
953 | * - among the disconnected devices | |
954 | * - in the orphanage | |
955 | */ | |
956 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
957 | if (replacing_cdev) { | |
958 | sch_attach_disconnected_device(sch, replacing_cdev); | |
85acc407 | 959 | /* Release reference from get_disc_ccwdev_by_dev_id() */ |
97166f52 | 960 | put_device(&replacing_cdev->dev); |
6eff208f CH |
961 | /* Release reference of subchannel from old cdev. */ |
962 | put_device(&sch->dev); | |
d7b5a4c9 CH |
963 | return; |
964 | } | |
965 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
966 | if (replacing_cdev) { | |
967 | sch_attach_orphaned_device(sch, replacing_cdev); | |
85acc407 | 968 | /* Release reference from get_orphaned_ccwdev_by_dev_id() */ |
97166f52 | 969 | put_device(&replacing_cdev->dev); |
6eff208f CH |
970 | /* Release reference of subchannel from old cdev. */ |
971 | put_device(&sch->dev); | |
d7b5a4c9 CH |
972 | return; |
973 | } | |
974 | sch_create_and_recog_new_device(sch); | |
6eff208f CH |
975 | /* Release reference of subchannel from old cdev. */ |
976 | put_device(&sch->dev); | |
d7b5a4c9 CH |
977 | } |
978 | ||
1da177e4 LT |
979 | /* |
980 | * Register recognized device. | |
981 | */ | |
982 | static void | |
c1637532 | 983 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 984 | { |
c1637532 | 985 | struct ccw_device_private *priv; |
1da177e4 LT |
986 | struct ccw_device *cdev; |
987 | struct subchannel *sch; | |
988 | int ret; | |
989 | unsigned long flags; | |
990 | ||
c1637532 MS |
991 | priv = container_of(work, struct ccw_device_private, kick_work); |
992 | cdev = priv->cdev; | |
1da177e4 | 993 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
994 | /* |
995 | * Check if subchannel is still registered. It may have become | |
996 | * unregistered if a machine check hit us after finishing | |
997 | * device recognition but before the register work could be | |
998 | * queued. | |
999 | */ | |
1000 | if (!device_is_registered(&sch->dev)) | |
1001 | goto out_err; | |
82b7ac05 | 1002 | css_update_ssd_info(sch); |
47af5518 CH |
1003 | /* |
1004 | * io_subchannel_register() will also be called after device | |
1005 | * recognition has been done for a boxed device (which will already | |
1006 | * be registered). We need to reprobe since we may now have sense id | |
1007 | * information. | |
1008 | */ | |
d6a30761 | 1009 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
1010 | if (!cdev->drv) { |
1011 | ret = device_reprobe(&cdev->dev); | |
1012 | if (ret) | |
1013 | /* We can't do much here. */ | |
139b83dd | 1014 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
1015 | " %d for 0.%x.%04x\n", ret, |
1016 | cdev->private->dev_id.ssid, | |
1017 | cdev->private->dev_id.devno); | |
47af5518 | 1018 | } |
1da177e4 LT |
1019 | goto out; |
1020 | } | |
fa1a8c23 CH |
1021 | /* |
1022 | * Now we know this subchannel will stay, we can throw | |
1023 | * our delayed uevent. | |
1024 | */ | |
f67f129e | 1025 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 1026 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
1027 | /* make it known to the system */ |
1028 | ret = ccw_device_register(cdev); | |
1029 | if (ret) { | |
e556bbbd CH |
1030 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
1031 | cdev->private->dev_id.ssid, | |
1032 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 1033 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 1034 | sch_set_cdev(sch, NULL); |
2ec22984 | 1035 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
1036 | /* Release initial device reference. */ |
1037 | put_device(&cdev->dev); | |
5fb6b854 | 1038 | goto out_err; |
1da177e4 | 1039 | } |
1da177e4 LT |
1040 | out: |
1041 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 1042 | wake_up(&cdev->private->wait_q); |
5fb6b854 CH |
1043 | out_err: |
1044 | /* Release reference for workqueue processing. */ | |
1045 | put_device(&cdev->dev); | |
1da177e4 LT |
1046 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1047 | wake_up(&ccw_device_init_wq); | |
1048 | } | |
1049 | ||
3f4cf6e7 | 1050 | static void ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 1051 | { |
c1637532 MS |
1052 | struct ccw_device_private *priv; |
1053 | struct ccw_device *cdev; | |
1da177e4 LT |
1054 | struct subchannel *sch; |
1055 | ||
c1637532 MS |
1056 | priv = container_of(work, struct ccw_device_private, kick_work); |
1057 | cdev = priv->cdev; | |
46fbe4e4 PO |
1058 | /* Get subchannel reference for local processing. */ |
1059 | if (!get_device(cdev->dev.parent)) | |
1060 | return; | |
1da177e4 | 1061 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 1062 | css_sch_device_unregister(sch); |
46fbe4e4 | 1063 | /* Release cdev reference for workqueue processing.*/ |
1da177e4 | 1064 | put_device(&cdev->dev); |
46fbe4e4 | 1065 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
1066 | put_device(&sch->dev); |
1067 | } | |
1068 | ||
c4621a62 SO |
1069 | void ccw_device_schedule_sch_unregister(struct ccw_device *cdev) |
1070 | { | |
be7a2ddc SO |
1071 | /* Get cdev reference for workqueue processing. */ |
1072 | if (!get_device(&cdev->dev)) | |
1073 | return; | |
c4621a62 SO |
1074 | PREPARE_WORK(&cdev->private->kick_work, |
1075 | ccw_device_call_sch_unregister); | |
1076 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1077 | } | |
1078 | ||
1da177e4 LT |
1079 | /* |
1080 | * subchannel recognition done. Called from the state machine. | |
1081 | */ | |
1082 | void | |
1083 | io_subchannel_recog_done(struct ccw_device *cdev) | |
1084 | { | |
1da177e4 LT |
1085 | if (css_init_done == 0) { |
1086 | cdev->private->flags.recog_done = 1; | |
1087 | return; | |
1088 | } | |
1089 | switch (cdev->private->state) { | |
47593bfa SO |
1090 | case DEV_STATE_BOXED: |
1091 | /* Device did not respond in time. */ | |
1da177e4 LT |
1092 | case DEV_STATE_NOT_OPER: |
1093 | cdev->private->flags.recog_done = 1; | |
c4621a62 | 1094 | ccw_device_schedule_sch_unregister(cdev); |
1da177e4 LT |
1095 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1096 | wake_up(&ccw_device_init_wq); | |
1097 | break; | |
1da177e4 LT |
1098 | case DEV_STATE_OFFLINE: |
1099 | /* | |
1100 | * We can't register the device in interrupt context so | |
1101 | * we schedule a work item. | |
1102 | */ | |
1103 | if (!get_device(&cdev->dev)) | |
1104 | break; | |
1105 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1106 | io_subchannel_register); |
1da177e4 LT |
1107 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1108 | break; | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | static int | |
1113 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
1114 | { | |
1115 | int rc; | |
1116 | struct ccw_device_private *priv; | |
1117 | ||
db6a6423 | 1118 | sch_set_cdev(sch, cdev); |
2ec22984 | 1119 | cdev->ccwlock = sch->lock; |
fb6958a5 | 1120 | |
1da177e4 LT |
1121 | /* Init private data. */ |
1122 | priv = cdev->private; | |
78964268 CH |
1123 | priv->dev_id.devno = sch->schib.pmcw.dev; |
1124 | priv->dev_id.ssid = sch->schid.ssid; | |
1125 | priv->schid = sch->schid; | |
1da177e4 LT |
1126 | priv->state = DEV_STATE_NOT_OPER; |
1127 | INIT_LIST_HEAD(&priv->cmb_list); | |
1128 | init_waitqueue_head(&priv->wait_q); | |
1129 | init_timer(&priv->timer); | |
1130 | ||
1da177e4 LT |
1131 | /* Increase counter of devices currently in recognition. */ |
1132 | atomic_inc(&ccw_device_init_count); | |
1133 | ||
1134 | /* Start async. device sensing. */ | |
2ec22984 | 1135 | spin_lock_irq(sch->lock); |
1da177e4 | 1136 | rc = ccw_device_recognition(cdev); |
2ec22984 | 1137 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
1138 | if (rc) { |
1139 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1140 | wake_up(&ccw_device_init_wq); | |
1141 | } | |
1142 | return rc; | |
1143 | } | |
1144 | ||
d7b5a4c9 CH |
1145 | static void ccw_device_move_to_sch(struct work_struct *work) |
1146 | { | |
1147 | struct ccw_device_private *priv; | |
1148 | int rc; | |
1149 | struct subchannel *sch; | |
1150 | struct ccw_device *cdev; | |
1151 | struct subchannel *former_parent; | |
1152 | ||
1153 | priv = container_of(work, struct ccw_device_private, kick_work); | |
1154 | sch = priv->sch; | |
1155 | cdev = priv->cdev; | |
6eff208f CH |
1156 | former_parent = to_subchannel(cdev->dev.parent); |
1157 | /* Get reference for new parent. */ | |
1158 | if (!get_device(&sch->dev)) | |
1159 | return; | |
d7b5a4c9 | 1160 | mutex_lock(&sch->reg_mutex); |
6eff208f CH |
1161 | /* |
1162 | * Try to move the ccw device to its new subchannel. | |
1163 | * Note: device_move() changes cdev->dev.parent | |
1164 | */ | |
ffa6a705 | 1165 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
1166 | mutex_unlock(&sch->reg_mutex); |
1167 | if (rc) { | |
139b83dd | 1168 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel " |
d7b5a4c9 CH |
1169 | "0.%x.%04x failed (ret=%d)!\n", |
1170 | cdev->private->dev_id.ssid, | |
1171 | cdev->private->dev_id.devno, sch->schid.ssid, | |
1172 | sch->schid.sch_no, rc); | |
1173 | css_sch_device_unregister(sch); | |
6eff208f CH |
1174 | /* Put reference for new parent again. */ |
1175 | put_device(&sch->dev); | |
d7b5a4c9 CH |
1176 | goto out; |
1177 | } | |
6eff208f | 1178 | if (!sch_is_pseudo_sch(former_parent)) { |
d7b5a4c9 | 1179 | spin_lock_irq(former_parent->lock); |
db6a6423 | 1180 | sch_set_cdev(former_parent, NULL); |
d7b5a4c9 CH |
1181 | spin_unlock_irq(former_parent->lock); |
1182 | css_sch_device_unregister(former_parent); | |
1183 | /* Reset intparm to zeroes. */ | |
13952ec1 SO |
1184 | former_parent->config.intparm = 0; |
1185 | cio_commit_config(former_parent); | |
d7b5a4c9 CH |
1186 | } |
1187 | sch_attach_device(sch, cdev); | |
1188 | out: | |
6eff208f CH |
1189 | /* Put reference for old parent. */ |
1190 | put_device(&former_parent->dev); | |
d7b5a4c9 CH |
1191 | put_device(&cdev->dev); |
1192 | } | |
1193 | ||
602b20f2 CH |
1194 | static void io_subchannel_irq(struct subchannel *sch) |
1195 | { | |
1196 | struct ccw_device *cdev; | |
1197 | ||
db6a6423 | 1198 | cdev = sch_get_cdev(sch); |
602b20f2 | 1199 | |
efd986db SO |
1200 | CIO_TRACE_EVENT(6, "IRQ"); |
1201 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
1202 | if (cdev) |
1203 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1204 | } | |
1205 | ||
13952ec1 SO |
1206 | void io_subchannel_init_config(struct subchannel *sch) |
1207 | { | |
1208 | memset(&sch->config, 0, sizeof(sch->config)); | |
1209 | sch->config.csense = 1; | |
d36f0c66 SO |
1210 | /* Use subchannel mp mode when there is more than 1 installed CHPID. */ |
1211 | if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0) | |
13952ec1 SO |
1212 | sch->config.mp = 1; |
1213 | } | |
1214 | ||
0ae7a7b2 CH |
1215 | static void io_subchannel_init_fields(struct subchannel *sch) |
1216 | { | |
1217 | if (cio_is_console(sch->schid)) | |
1218 | sch->opm = 0xff; | |
1219 | else | |
1220 | sch->opm = chp_get_sch_opm(sch); | |
1221 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1222 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1223 | |
1224 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1225 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1226 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1227 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1228 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1229 | |
1230 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1231 | } |
1232 | ||
90ed2b69 CH |
1233 | static void io_subchannel_do_unreg(struct work_struct *work) |
1234 | { | |
1235 | struct subchannel *sch; | |
1236 | ||
1237 | sch = container_of(work, struct subchannel, work); | |
1238 | css_sch_device_unregister(sch); | |
90ed2b69 CH |
1239 | put_device(&sch->dev); |
1240 | } | |
1241 | ||
1242 | /* Schedule unregister if we have no cdev. */ | |
1243 | static void io_subchannel_schedule_removal(struct subchannel *sch) | |
1244 | { | |
1245 | get_device(&sch->dev); | |
1246 | INIT_WORK(&sch->work, io_subchannel_do_unreg); | |
1247 | queue_work(slow_path_wq, &sch->work); | |
1248 | } | |
1249 | ||
1250 | /* | |
1251 | * Note: We always return 0 so that we bind to the device even on error. | |
1252 | * This is needed so that our remove function is called on unregister. | |
1253 | */ | |
0ae7a7b2 | 1254 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1255 | { |
1da177e4 LT |
1256 | struct ccw_device *cdev; |
1257 | int rc; | |
1258 | unsigned long flags; | |
d7b5a4c9 | 1259 | struct ccw_dev_id dev_id; |
1da177e4 | 1260 | |
db6a6423 CH |
1261 | cdev = sch_get_cdev(sch); |
1262 | if (cdev) { | |
7e9db9ea CH |
1263 | rc = sysfs_create_group(&sch->dev.kobj, |
1264 | &io_subchannel_attr_group); | |
1265 | if (rc) | |
1266 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1267 | "attributes for subchannel " | |
1268 | "0.%x.%04x (rc=%d)\n", | |
1269 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 LT |
1270 | /* |
1271 | * This subchannel already has an associated ccw_device. | |
7e9db9ea CH |
1272 | * Throw the delayed uevent for the subchannel, register |
1273 | * the ccw_device and exit. This happens for all early | |
1274 | * devices, e.g. the console. | |
1da177e4 | 1275 | */ |
f67f129e | 1276 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1277 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
e1031786 | 1278 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1279 | device_initialize(&cdev->dev); |
1280 | ccw_device_register(cdev); | |
1da177e4 LT |
1281 | /* |
1282 | * Check if the device is already online. If it is | |
9cd67421 CH |
1283 | * the reference count needs to be corrected since we |
1284 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1285 | */ |
1286 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1287 | cdev->private->state != DEV_STATE_OFFLINE && | |
1288 | cdev->private->state != DEV_STATE_BOXED) | |
1289 | get_device(&cdev->dev); | |
1290 | return 0; | |
1291 | } | |
0ae7a7b2 | 1292 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1293 | rc = cio_commit_config(sch); |
1294 | if (rc) | |
1295 | goto out_schedule; | |
7e9db9ea CH |
1296 | rc = sysfs_create_group(&sch->dev.kobj, |
1297 | &io_subchannel_attr_group); | |
1298 | if (rc) | |
90ed2b69 | 1299 | goto out_schedule; |
cd6b4f27 CH |
1300 | /* Allocate I/O subchannel private data. */ |
1301 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1302 | GFP_KERNEL | GFP_DMA); | |
90ed2b69 | 1303 | if (!sch->private) |
7e9db9ea | 1304 | goto out_err; |
111e95a4 SO |
1305 | /* |
1306 | * First check if a fitting device may be found amongst the | |
1307 | * disconnected devices or in the orphanage. | |
1308 | */ | |
1309 | dev_id.devno = sch->schib.pmcw.dev; | |
1310 | dev_id.ssid = sch->schid.ssid; | |
d7b5a4c9 CH |
1311 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); |
1312 | if (!cdev) | |
1313 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1314 | &dev_id); | |
1315 | if (cdev) { | |
1316 | /* | |
1317 | * Schedule moving the device until when we have a registered | |
1318 | * subchannel to move to and succeed the probe. We can | |
1319 | * unregister later again, when the probe is through. | |
1320 | */ | |
1321 | cdev->private->sch = sch; | |
1322 | PREPARE_WORK(&cdev->private->kick_work, | |
1323 | ccw_device_move_to_sch); | |
1324 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1325 | return 0; | |
1326 | } | |
7674da77 | 1327 | cdev = io_subchannel_create_ccwdev(sch); |
90ed2b69 | 1328 | if (IS_ERR(cdev)) |
7e9db9ea | 1329 | goto out_err; |
8bbace7e | 1330 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1331 | if (rc) { |
2ec22984 | 1332 | spin_lock_irqsave(sch->lock, flags); |
90ed2b69 | 1333 | io_subchannel_recog_done(cdev); |
2ec22984 | 1334 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 | 1335 | } |
7e9db9ea CH |
1336 | return 0; |
1337 | out_err: | |
1338 | kfree(sch->private); | |
1339 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); | |
90ed2b69 CH |
1340 | out_schedule: |
1341 | io_subchannel_schedule_removal(sch); | |
1342 | return 0; | |
1da177e4 LT |
1343 | } |
1344 | ||
1da177e4 | 1345 | static int |
8bbace7e | 1346 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1347 | { |
1348 | struct ccw_device *cdev; | |
1349 | unsigned long flags; | |
1350 | ||
db6a6423 CH |
1351 | cdev = sch_get_cdev(sch); |
1352 | if (!cdev) | |
1da177e4 | 1353 | return 0; |
1da177e4 LT |
1354 | /* Set ccw device to not operational and drop reference. */ |
1355 | spin_lock_irqsave(cdev->ccwlock, flags); | |
db6a6423 | 1356 | sch_set_cdev(sch, NULL); |
1da177e4 LT |
1357 | cdev->private->state = DEV_STATE_NOT_OPER; |
1358 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c | 1359 | ccw_device_unregister(cdev); |
cd6b4f27 | 1360 | kfree(sch->private); |
7e9db9ea | 1361 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1362 | return 0; |
1363 | } | |
1364 | ||
602b20f2 | 1365 | static int io_subchannel_notify(struct subchannel *sch, int event) |
1da177e4 LT |
1366 | { |
1367 | struct ccw_device *cdev; | |
1368 | ||
db6a6423 | 1369 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1370 | if (!cdev) |
1371 | return 0; | |
c820de39 | 1372 | return ccw_device_notify(cdev, event); |
1da177e4 LT |
1373 | } |
1374 | ||
602b20f2 | 1375 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1376 | { |
1377 | struct ccw_device *cdev; | |
1378 | ||
db6a6423 | 1379 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1380 | if (cdev) |
1381 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1382 | } | |
1383 | ||
c820de39 | 1384 | static int check_for_io_on_path(struct subchannel *sch, int mask) |
1da177e4 | 1385 | { |
cdb912a4 | 1386 | if (cio_update_schib(sch)) |
c820de39 | 1387 | return 0; |
23d805b6 | 1388 | if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask) |
c820de39 CH |
1389 | return 1; |
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | static void terminate_internal_io(struct subchannel *sch, | |
1394 | struct ccw_device *cdev) | |
1395 | { | |
1396 | if (cio_clear(sch)) { | |
1397 | /* Recheck device in case clear failed. */ | |
1398 | sch->lpm = 0; | |
1399 | if (cdev->online) | |
1400 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1401 | else | |
1402 | css_schedule_eval(sch->schid); | |
d23861ff | 1403 | return; |
c820de39 | 1404 | } |
1da177e4 | 1405 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
c820de39 CH |
1406 | /* Request retry of internal operation. */ |
1407 | cdev->private->flags.intretry = 1; | |
1408 | /* Call handler. */ | |
1da177e4 LT |
1409 | if (cdev->handler) |
1410 | cdev->handler(cdev, cdev->private->intparm, | |
1411 | ERR_PTR(-EIO)); | |
1412 | } | |
1413 | ||
c820de39 CH |
1414 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1415 | { | |
1416 | struct ccw_device *cdev; | |
1417 | ||
1418 | cdev = sch_get_cdev(sch); | |
1419 | if (!cdev) | |
1420 | return; | |
1421 | if (check_for_io_on_path(sch, mask)) { | |
1422 | if (cdev->private->state == DEV_STATE_ONLINE) | |
1423 | ccw_device_kill_io(cdev); | |
1424 | else { | |
1425 | terminate_internal_io(sch, cdev); | |
1426 | /* Re-start path verification. */ | |
1427 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1428 | } | |
1429 | } else | |
1430 | /* trigger path verification. */ | |
1431 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1432 | ||
1433 | } | |
1434 | ||
99611f87 CH |
1435 | static int io_subchannel_chp_event(struct subchannel *sch, |
1436 | struct chp_link *link, int event) | |
c820de39 CH |
1437 | { |
1438 | int mask; | |
c820de39 | 1439 | |
99611f87 | 1440 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1441 | if (!mask) |
1442 | return 0; | |
1443 | switch (event) { | |
1444 | case CHP_VARY_OFF: | |
1445 | sch->opm &= ~mask; | |
1446 | sch->lpm &= ~mask; | |
1447 | io_subchannel_terminate_path(sch, mask); | |
1448 | break; | |
1449 | case CHP_VARY_ON: | |
1450 | sch->opm |= mask; | |
1451 | sch->lpm |= mask; | |
1452 | io_subchannel_verify(sch); | |
1453 | break; | |
1454 | case CHP_OFFLINE: | |
cdb912a4 | 1455 | if (cio_update_schib(sch)) |
c820de39 CH |
1456 | return -ENODEV; |
1457 | io_subchannel_terminate_path(sch, mask); | |
1458 | break; | |
1459 | case CHP_ONLINE: | |
cdb912a4 SO |
1460 | if (cio_update_schib(sch)) |
1461 | return -ENODEV; | |
c820de39 CH |
1462 | sch->lpm |= mask & sch->opm; |
1463 | io_subchannel_verify(sch); | |
1464 | break; | |
1465 | } | |
1466 | return 0; | |
1467 | } | |
1468 | ||
1da177e4 | 1469 | static void |
8bbace7e | 1470 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1471 | { |
1da177e4 LT |
1472 | struct ccw_device *cdev; |
1473 | int ret; | |
1474 | ||
db6a6423 | 1475 | cdev = sch_get_cdev(sch); |
1da177e4 | 1476 | |
a8237fc4 | 1477 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1478 | return; |
1479 | if (!sch->schib.pmcw.ena) | |
1480 | /* Nothing to do. */ | |
1481 | return; | |
1482 | ret = cio_disable_subchannel(sch); | |
1483 | if (ret != -EBUSY) | |
1484 | /* Subchannel is disabled, we're done. */ | |
1485 | return; | |
1486 | cdev->private->state = DEV_STATE_QUIESCE; | |
1487 | if (cdev->handler) | |
1488 | cdev->handler(cdev, cdev->private->intparm, | |
1489 | ERR_PTR(-EIO)); | |
1490 | ret = ccw_device_cancel_halt_clear(cdev); | |
1491 | if (ret == -EBUSY) { | |
1492 | ccw_device_set_timeout(cdev, HZ/10); | |
1493 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1494 | } | |
1495 | cio_disable_subchannel(sch); | |
1496 | } | |
1497 | ||
c820de39 CH |
1498 | static int io_subchannel_get_status(struct subchannel *sch) |
1499 | { | |
1500 | struct schib schib; | |
1501 | ||
1502 | if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) | |
1503 | return CIO_GONE; | |
1504 | if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) | |
1505 | return CIO_REVALIDATE; | |
1506 | if (!sch->lpm) | |
1507 | return CIO_NO_PATH; | |
1508 | return CIO_OPER; | |
1509 | } | |
1510 | ||
1511 | static int device_is_disconnected(struct ccw_device *cdev) | |
1512 | { | |
1513 | if (!cdev) | |
1514 | return 0; | |
1515 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1516 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1517 | } | |
1518 | ||
1519 | static int recovery_check(struct device *dev, void *data) | |
1520 | { | |
1521 | struct ccw_device *cdev = to_ccwdev(dev); | |
1522 | int *redo = data; | |
1523 | ||
1524 | spin_lock_irq(cdev->ccwlock); | |
1525 | switch (cdev->private->state) { | |
1526 | case DEV_STATE_DISCONNECTED: | |
1527 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1528 | cdev->private->dev_id.ssid, | |
1529 | cdev->private->dev_id.devno); | |
1530 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1531 | *redo = 1; | |
1532 | break; | |
1533 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1534 | *redo = 1; | |
1535 | break; | |
1536 | } | |
1537 | spin_unlock_irq(cdev->ccwlock); | |
1538 | ||
1539 | return 0; | |
1540 | } | |
1541 | ||
1542 | static void recovery_work_func(struct work_struct *unused) | |
1543 | { | |
1544 | int redo = 0; | |
1545 | ||
1546 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1547 | if (redo) { | |
1548 | spin_lock_irq(&recovery_lock); | |
1549 | if (!timer_pending(&recovery_timer)) { | |
1550 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1551 | recovery_phase++; | |
1552 | mod_timer(&recovery_timer, jiffies + | |
1553 | recovery_delay[recovery_phase] * HZ); | |
1554 | } | |
1555 | spin_unlock_irq(&recovery_lock); | |
1556 | } else | |
1557 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1558 | } | |
1559 | ||
1560 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1561 | ||
1562 | static void recovery_func(unsigned long data) | |
1563 | { | |
1564 | /* | |
1565 | * We can't do our recovery in softirq context and it's not | |
1566 | * performance critical, so we schedule it. | |
1567 | */ | |
1568 | schedule_work(&recovery_work); | |
1569 | } | |
1570 | ||
1571 | static void ccw_device_schedule_recovery(void) | |
1572 | { | |
1573 | unsigned long flags; | |
1574 | ||
1575 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1576 | spin_lock_irqsave(&recovery_lock, flags); | |
1577 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1578 | recovery_phase = 0; | |
1579 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1580 | } | |
1581 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1582 | } | |
1583 | ||
ecf5d9ef PO |
1584 | static int purge_fn(struct device *dev, void *data) |
1585 | { | |
1586 | struct ccw_device *cdev = to_ccwdev(dev); | |
1587 | struct ccw_device_private *priv = cdev->private; | |
1588 | int unreg; | |
1589 | ||
1590 | spin_lock_irq(cdev->ccwlock); | |
1591 | unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) && | |
1592 | (priv->state == DEV_STATE_OFFLINE); | |
1593 | spin_unlock_irq(cdev->ccwlock); | |
1594 | if (!unreg) | |
1595 | goto out; | |
ecf5d9ef PO |
1596 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid, |
1597 | priv->dev_id.devno); | |
c4621a62 | 1598 | ccw_device_schedule_sch_unregister(cdev); |
ecf5d9ef PO |
1599 | |
1600 | out: | |
1601 | /* Abort loop in case of pending signal. */ | |
1602 | if (signal_pending(current)) | |
1603 | return -EINTR; | |
1604 | ||
1605 | return 0; | |
1606 | } | |
1607 | ||
1608 | /** | |
1609 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1610 | * | |
1611 | * Unregister all ccw devices that are offline and on the blacklist. | |
1612 | */ | |
1613 | int ccw_purge_blacklisted(void) | |
1614 | { | |
1615 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1616 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1617 | return 0; | |
1618 | } | |
1619 | ||
c820de39 CH |
1620 | static void device_set_disconnected(struct ccw_device *cdev) |
1621 | { | |
1622 | if (!cdev) | |
1623 | return; | |
1624 | ccw_device_set_timeout(cdev, 0); | |
1625 | cdev->private->flags.fake_irb = 0; | |
1626 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1627 | if (cdev->online) | |
1628 | ccw_device_schedule_recovery(); | |
1629 | } | |
1630 | ||
91c36919 PO |
1631 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1632 | { | |
1633 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1634 | ||
1635 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1636 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1637 | ccw_device_set_timeout(cdev, 0); |
1638 | cio_disable_subchannel(sch); | |
1639 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1640 | } | |
1641 | ||
c820de39 CH |
1642 | static int io_subchannel_sch_event(struct subchannel *sch, int slow) |
1643 | { | |
1644 | int event, ret, disc; | |
1645 | unsigned long flags; | |
91c36919 | 1646 | enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE, DISC } action; |
c820de39 CH |
1647 | struct ccw_device *cdev; |
1648 | ||
1649 | spin_lock_irqsave(sch->lock, flags); | |
1650 | cdev = sch_get_cdev(sch); | |
1651 | disc = device_is_disconnected(cdev); | |
1652 | if (disc && slow) { | |
1653 | /* Disconnected devices are evaluated directly only.*/ | |
1654 | spin_unlock_irqrestore(sch->lock, flags); | |
1655 | return 0; | |
1656 | } | |
1657 | /* No interrupt after machine check - kill pending timers. */ | |
1658 | if (cdev) | |
1659 | ccw_device_set_timeout(cdev, 0); | |
1660 | if (!disc && !slow) { | |
1661 | /* Non-disconnected devices are evaluated on the slow path. */ | |
1662 | spin_unlock_irqrestore(sch->lock, flags); | |
1663 | return -EAGAIN; | |
1664 | } | |
1665 | event = io_subchannel_get_status(sch); | |
1666 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", | |
1667 | sch->schid.ssid, sch->schid.sch_no, event, | |
1668 | disc ? "disconnected" : "normal", | |
1669 | slow ? "slow" : "fast"); | |
1670 | /* Analyze subchannel status. */ | |
1671 | action = NONE; | |
1672 | switch (event) { | |
1673 | case CIO_NO_PATH: | |
1674 | if (disc) { | |
1675 | /* Check if paths have become available. */ | |
1676 | action = REPROBE; | |
1677 | break; | |
1678 | } | |
1679 | /* fall through */ | |
1680 | case CIO_GONE: | |
c820de39 | 1681 | /* Ask driver what to do with device. */ |
91c36919 PO |
1682 | if (io_subchannel_notify(sch, event)) |
1683 | action = DISC; | |
1684 | else | |
1685 | action = UNREGISTER; | |
c820de39 CH |
1686 | break; |
1687 | case CIO_REVALIDATE: | |
1688 | /* Device will be removed, so no notify necessary. */ | |
1689 | if (disc) | |
1690 | /* Reprobe because immediate unregister might block. */ | |
1691 | action = REPROBE; | |
1692 | else | |
1693 | action = UNREGISTER_PROBE; | |
1694 | break; | |
1695 | case CIO_OPER: | |
1696 | if (disc) | |
1697 | /* Get device operational again. */ | |
1698 | action = REPROBE; | |
1699 | break; | |
1700 | } | |
1701 | /* Perform action. */ | |
1702 | ret = 0; | |
1703 | switch (action) { | |
1704 | case UNREGISTER: | |
1705 | case UNREGISTER_PROBE: | |
91c36919 | 1706 | ccw_device_set_notoper(cdev); |
c820de39 CH |
1707 | /* Unregister device (will use subchannel lock). */ |
1708 | spin_unlock_irqrestore(sch->lock, flags); | |
1709 | css_sch_device_unregister(sch); | |
1710 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 CH |
1711 | break; |
1712 | case REPROBE: | |
1713 | ccw_device_trigger_reprobe(cdev); | |
1714 | break; | |
91c36919 PO |
1715 | case DISC: |
1716 | device_set_disconnected(cdev); | |
1717 | break; | |
c820de39 CH |
1718 | default: |
1719 | break; | |
1720 | } | |
1721 | spin_unlock_irqrestore(sch->lock, flags); | |
1722 | /* Probe if necessary. */ | |
1723 | if (action == UNREGISTER_PROBE) | |
1724 | ret = css_probe_device(sch->schid); | |
1725 | ||
1726 | return ret; | |
1727 | } | |
1728 | ||
1da177e4 LT |
1729 | #ifdef CONFIG_CCW_CONSOLE |
1730 | static struct ccw_device console_cdev; | |
1731 | static struct ccw_device_private console_private; | |
1732 | static int console_cdev_in_use; | |
1733 | ||
2ec22984 CH |
1734 | static DEFINE_SPINLOCK(ccw_console_lock); |
1735 | ||
1736 | spinlock_t * cio_get_console_lock(void) | |
1737 | { | |
1738 | return &ccw_console_lock; | |
1739 | } | |
1740 | ||
0ae7a7b2 CH |
1741 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1742 | struct subchannel *sch) | |
1da177e4 LT |
1743 | { |
1744 | int rc; | |
1745 | ||
cd6b4f27 CH |
1746 | /* Attach subchannel private data. */ |
1747 | sch->private = cio_get_console_priv(); | |
1748 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 | 1749 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1750 | rc = cio_commit_config(sch); |
1751 | if (rc) | |
1752 | return rc; | |
0ae7a7b2 | 1753 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1754 | /* Initialize the ccw_device structure. */ |
292888c8 | 1755 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1756 | rc = io_subchannel_recog(cdev, sch); |
1757 | if (rc) | |
1758 | return rc; | |
1759 | ||
1760 | /* Now wait for the async. recognition to come to an end. */ | |
1761 | spin_lock_irq(cdev->ccwlock); | |
1762 | while (!dev_fsm_final_state(cdev)) | |
1763 | wait_cons_dev(); | |
1764 | rc = -EIO; | |
1765 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1766 | goto out_unlock; | |
1767 | ccw_device_online(cdev); | |
1768 | while (!dev_fsm_final_state(cdev)) | |
1769 | wait_cons_dev(); | |
1770 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1771 | goto out_unlock; | |
1772 | rc = 0; | |
1773 | out_unlock: | |
1774 | spin_unlock_irq(cdev->ccwlock); | |
1775 | return 0; | |
1776 | } | |
1777 | ||
1778 | struct ccw_device * | |
1779 | ccw_device_probe_console(void) | |
1780 | { | |
1781 | struct subchannel *sch; | |
1782 | int ret; | |
1783 | ||
1784 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1785 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1786 | sch = cio_probe_console(); |
1787 | if (IS_ERR(sch)) { | |
1788 | console_cdev_in_use = 0; | |
1789 | return (void *) sch; | |
1790 | } | |
1791 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1792 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1793 | console_cdev.private = &console_private; | |
c1637532 | 1794 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1795 | ret = ccw_device_console_enable(&console_cdev, sch); |
1796 | if (ret) { | |
1797 | cio_release_console(); | |
1798 | console_cdev_in_use = 0; | |
1799 | return ERR_PTR(ret); | |
1800 | } | |
1801 | console_cdev.online = 1; | |
1802 | return &console_cdev; | |
1803 | } | |
1f4e7eda | 1804 | |
6664845c MS |
1805 | static int ccw_device_pm_restore(struct device *dev); |
1806 | ||
1807 | int ccw_device_force_console(void) | |
1808 | { | |
1809 | if (!console_cdev_in_use) | |
1810 | return -ENODEV; | |
1811 | return ccw_device_pm_restore(&console_cdev.dev); | |
1812 | } | |
1813 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1814 | #endif |
1815 | ||
1816 | /* | |
1817 | * get ccw_device matching the busid, but only if owned by cdrv | |
1818 | */ | |
b0744bd2 CH |
1819 | static int |
1820 | __ccwdev_check_busid(struct device *dev, void *id) | |
1821 | { | |
1822 | char *bus_id; | |
1823 | ||
12975aef | 1824 | bus_id = id; |
b0744bd2 | 1825 | |
98df67b3 | 1826 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1827 | } |
1828 | ||
1829 | ||
b2ffd8e9 CH |
1830 | /** |
1831 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1832 | * @cdrv: driver the device is owned by | |
1833 | * @bus_id: bus id of the device to be searched | |
1834 | * | |
1835 | * This function searches all devices owned by @cdrv for a device with a bus | |
1836 | * id matching @bus_id. | |
1837 | * Returns: | |
1838 | * If a match is found, its reference count of the found device is increased | |
1839 | * and it is returned; else %NULL is returned. | |
1840 | */ | |
1841 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1842 | const char *bus_id) | |
1da177e4 | 1843 | { |
b0744bd2 | 1844 | struct device *dev; |
1da177e4 LT |
1845 | struct device_driver *drv; |
1846 | ||
1847 | drv = get_driver(&cdrv->driver); | |
1848 | if (!drv) | |
b0744bd2 | 1849 | return NULL; |
1da177e4 | 1850 | |
b0744bd2 CH |
1851 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1852 | __ccwdev_check_busid); | |
1da177e4 LT |
1853 | put_driver(drv); |
1854 | ||
d2c993d8 | 1855 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1856 | } |
1857 | ||
1858 | /************************** device driver handling ************************/ | |
1859 | ||
1860 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1861 | * and release methods are initially very similar to the device_driver | |
1862 | * implementations, with the difference that they have ccw_device | |
1863 | * arguments. | |
1864 | * | |
1865 | * A ccw driver also contains the information that is needed for | |
1866 | * device matching. | |
1867 | */ | |
1868 | static int | |
1869 | ccw_device_probe (struct device *dev) | |
1870 | { | |
1871 | struct ccw_device *cdev = to_ccwdev(dev); | |
1872 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1873 | int ret; | |
1874 | ||
1875 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1876 | ||
1877 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1878 | ||
1879 | if (ret) { | |
d2c993d8 | 1880 | cdev->drv = NULL; |
1da177e4 LT |
1881 | return ret; |
1882 | } | |
1883 | ||
1884 | return 0; | |
1885 | } | |
1886 | ||
1887 | static int | |
1888 | ccw_device_remove (struct device *dev) | |
1889 | { | |
1890 | struct ccw_device *cdev = to_ccwdev(dev); | |
1891 | struct ccw_driver *cdrv = cdev->drv; | |
1892 | int ret; | |
1893 | ||
1da177e4 LT |
1894 | if (cdrv->remove) |
1895 | cdrv->remove(cdev); | |
1896 | if (cdev->online) { | |
1897 | cdev->online = 0; | |
1898 | spin_lock_irq(cdev->ccwlock); | |
1899 | ret = ccw_device_offline(cdev); | |
1900 | spin_unlock_irq(cdev->ccwlock); | |
1901 | if (ret == 0) | |
1902 | wait_event(cdev->private->wait_q, | |
1903 | dev_fsm_final_state(cdev)); | |
1904 | else | |
139b83dd | 1905 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1906 | "device 0.%x.%04x\n", |
1907 | ret, cdev->private->dev_id.ssid, | |
1908 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1909 | /* Give up reference obtained in ccw_device_set_online(). */ |
1910 | put_device(&cdev->dev); | |
1da177e4 LT |
1911 | } |
1912 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1913 | cdev->drv = NULL; |
1da177e4 LT |
1914 | return 0; |
1915 | } | |
1916 | ||
958974fb CH |
1917 | static void ccw_device_shutdown(struct device *dev) |
1918 | { | |
1919 | struct ccw_device *cdev; | |
1920 | ||
1921 | cdev = to_ccwdev(dev); | |
1922 | if (cdev->drv && cdev->drv->shutdown) | |
1923 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1924 | disable_cmf(cdev); |
958974fb CH |
1925 | } |
1926 | ||
823d494a SO |
1927 | static int ccw_device_pm_prepare(struct device *dev) |
1928 | { | |
1929 | struct ccw_device *cdev = to_ccwdev(dev); | |
1930 | ||
1931 | if (work_pending(&cdev->private->kick_work)) | |
1932 | return -EAGAIN; | |
1933 | /* Fail while device is being set online/offline. */ | |
1934 | if (atomic_read(&cdev->private->onoff)) | |
1935 | return -EAGAIN; | |
1936 | ||
1937 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1938 | return cdev->drv->prepare(cdev); | |
1939 | ||
1940 | return 0; | |
1941 | } | |
1942 | ||
1943 | static void ccw_device_pm_complete(struct device *dev) | |
1944 | { | |
1945 | struct ccw_device *cdev = to_ccwdev(dev); | |
1946 | ||
1947 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1948 | cdev->drv->complete(cdev); | |
1949 | } | |
1950 | ||
1951 | static int ccw_device_pm_freeze(struct device *dev) | |
1952 | { | |
1953 | struct ccw_device *cdev = to_ccwdev(dev); | |
1954 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1955 | int ret, cm_enabled; | |
1956 | ||
1957 | /* Fail suspend while device is in transistional state. */ | |
1958 | if (!dev_fsm_final_state(cdev)) | |
1959 | return -EAGAIN; | |
1960 | if (!cdev->online) | |
1961 | return 0; | |
1962 | if (cdev->drv && cdev->drv->freeze) { | |
1963 | ret = cdev->drv->freeze(cdev); | |
1964 | if (ret) | |
1965 | return ret; | |
1966 | } | |
1967 | ||
1968 | spin_lock_irq(sch->lock); | |
1969 | cm_enabled = cdev->private->cmb != NULL; | |
1970 | spin_unlock_irq(sch->lock); | |
1971 | if (cm_enabled) { | |
1972 | /* Don't have the css write on memory. */ | |
1973 | ret = ccw_set_cmf(cdev, 0); | |
1974 | if (ret) | |
1975 | return ret; | |
1976 | } | |
1977 | /* From here on, disallow device driver I/O. */ | |
1978 | spin_lock_irq(sch->lock); | |
1979 | ret = cio_disable_subchannel(sch); | |
1980 | spin_unlock_irq(sch->lock); | |
1981 | ||
1982 | return ret; | |
1983 | } | |
1984 | ||
1985 | static int ccw_device_pm_thaw(struct device *dev) | |
1986 | { | |
1987 | struct ccw_device *cdev = to_ccwdev(dev); | |
1988 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1989 | int ret, cm_enabled; | |
1990 | ||
1991 | if (!cdev->online) | |
1992 | return 0; | |
1993 | ||
1994 | spin_lock_irq(sch->lock); | |
1995 | /* Allow device driver I/O again. */ | |
1996 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1997 | cm_enabled = cdev->private->cmb != NULL; | |
1998 | spin_unlock_irq(sch->lock); | |
1999 | if (ret) | |
2000 | return ret; | |
2001 | ||
2002 | if (cm_enabled) { | |
2003 | ret = ccw_set_cmf(cdev, 1); | |
2004 | if (ret) | |
2005 | return ret; | |
2006 | } | |
2007 | ||
2008 | if (cdev->drv && cdev->drv->thaw) | |
2009 | ret = cdev->drv->thaw(cdev); | |
2010 | ||
2011 | return ret; | |
2012 | } | |
2013 | ||
2014 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
2015 | { | |
2016 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2017 | int ret; | |
2018 | ||
2019 | if (cio_is_console(sch->schid)) | |
2020 | goto out; | |
2021 | /* | |
2022 | * While we were sleeping, devices may have gone or become | |
2023 | * available again. Kick re-detection. | |
2024 | */ | |
2025 | spin_lock_irq(sch->lock); | |
2026 | cdev->private->flags.resuming = 1; | |
2027 | ret = ccw_device_recognition(cdev); | |
2028 | spin_unlock_irq(sch->lock); | |
2029 | if (ret) { | |
2030 | CIO_MSG_EVENT(0, "Couldn't start recognition for device " | |
f014824e SO |
2031 | "0.%x.%04x (ret=%d)\n", |
2032 | cdev->private->dev_id.ssid, | |
2033 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
2034 | spin_lock_irq(sch->lock); |
2035 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
2036 | spin_unlock_irq(sch->lock); | |
2037 | /* notify driver after the resume cb */ | |
2038 | goto out; | |
2039 | } | |
2040 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || | |
2041 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
2042 | ||
2043 | out: | |
2044 | cdev->private->flags.resuming = 0; | |
2045 | } | |
2046 | ||
2047 | static int resume_handle_boxed(struct ccw_device *cdev) | |
2048 | { | |
2049 | cdev->private->state = DEV_STATE_BOXED; | |
2050 | if (ccw_device_notify(cdev, CIO_BOXED)) | |
2051 | return 0; | |
2052 | ccw_device_schedule_sch_unregister(cdev); | |
2053 | return -ENODEV; | |
2054 | } | |
2055 | ||
2056 | static int resume_handle_disc(struct ccw_device *cdev) | |
2057 | { | |
2058 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
2059 | if (ccw_device_notify(cdev, CIO_GONE)) | |
2060 | return 0; | |
2061 | ccw_device_schedule_sch_unregister(cdev); | |
2062 | return -ENODEV; | |
2063 | } | |
2064 | ||
2065 | static int ccw_device_pm_restore(struct device *dev) | |
2066 | { | |
2067 | struct ccw_device *cdev = to_ccwdev(dev); | |
2068 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2069 | int ret = 0, cm_enabled; | |
2070 | ||
2071 | __ccw_device_pm_restore(cdev); | |
2072 | spin_lock_irq(sch->lock); | |
2073 | if (cio_is_console(sch->schid)) { | |
2074 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
2075 | spin_unlock_irq(sch->lock); | |
2076 | goto out_restore; | |
2077 | } | |
2078 | cdev->private->flags.donotify = 0; | |
2079 | /* check recognition results */ | |
2080 | switch (cdev->private->state) { | |
2081 | case DEV_STATE_OFFLINE: | |
2082 | break; | |
2083 | case DEV_STATE_BOXED: | |
2084 | ret = resume_handle_boxed(cdev); | |
2085 | spin_unlock_irq(sch->lock); | |
2086 | if (ret) | |
2087 | goto out; | |
2088 | goto out_restore; | |
2089 | case DEV_STATE_DISCONNECTED: | |
2090 | goto out_disc_unlock; | |
2091 | default: | |
2092 | goto out_unreg_unlock; | |
2093 | } | |
2094 | /* check if the device id has changed */ | |
2095 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
f014824e SO |
2096 | CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno " |
2097 | "changed from %04x to %04x)\n", | |
2098 | sch->schid.ssid, sch->schid.sch_no, | |
823d494a SO |
2099 | cdev->private->dev_id.devno, |
2100 | sch->schib.pmcw.dev); | |
2101 | goto out_unreg_unlock; | |
2102 | } | |
2103 | /* check if the device type has changed */ | |
2104 | if (!ccw_device_test_sense_data(cdev)) { | |
2105 | ccw_device_update_sense_data(cdev); | |
2106 | PREPARE_WORK(&cdev->private->kick_work, | |
2107 | ccw_device_do_unbind_bind); | |
2108 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
2109 | ret = -ENODEV; | |
2110 | goto out_unlock; | |
2111 | } | |
2112 | if (!cdev->online) { | |
2113 | ret = 0; | |
2114 | goto out_unlock; | |
2115 | } | |
2116 | ret = ccw_device_online(cdev); | |
2117 | if (ret) | |
2118 | goto out_disc_unlock; | |
2119 | ||
2120 | cm_enabled = cdev->private->cmb != NULL; | |
2121 | spin_unlock_irq(sch->lock); | |
2122 | ||
2123 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
2124 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
2125 | spin_lock_irq(sch->lock); | |
2126 | goto out_disc_unlock; | |
2127 | } | |
2128 | if (cm_enabled) { | |
2129 | ret = ccw_set_cmf(cdev, 1); | |
2130 | if (ret) { | |
f014824e SO |
2131 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
2132 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
2133 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
2134 | ret = 0; |
2135 | } | |
2136 | } | |
2137 | ||
2138 | out_restore: | |
2139 | if (cdev->online && cdev->drv && cdev->drv->restore) | |
2140 | ret = cdev->drv->restore(cdev); | |
2141 | out: | |
2142 | return ret; | |
2143 | ||
2144 | out_disc_unlock: | |
2145 | ret = resume_handle_disc(cdev); | |
2146 | spin_unlock_irq(sch->lock); | |
2147 | if (ret) | |
2148 | return ret; | |
2149 | goto out_restore; | |
2150 | ||
2151 | out_unreg_unlock: | |
2152 | ccw_device_schedule_sch_unregister(cdev); | |
2153 | ret = -ENODEV; | |
2154 | out_unlock: | |
2155 | spin_unlock_irq(sch->lock); | |
2156 | return ret; | |
2157 | } | |
2158 | ||
2159 | static struct dev_pm_ops ccw_pm_ops = { | |
2160 | .prepare = ccw_device_pm_prepare, | |
2161 | .complete = ccw_device_pm_complete, | |
2162 | .freeze = ccw_device_pm_freeze, | |
2163 | .thaw = ccw_device_pm_thaw, | |
2164 | .restore = ccw_device_pm_restore, | |
2165 | }; | |
2166 | ||
8bbace7e CH |
2167 | struct bus_type ccw_bus_type = { |
2168 | .name = "ccw", | |
2169 | .match = ccw_bus_match, | |
2170 | .uevent = ccw_uevent, | |
2171 | .probe = ccw_device_probe, | |
2172 | .remove = ccw_device_remove, | |
958974fb | 2173 | .shutdown = ccw_device_shutdown, |
823d494a | 2174 | .pm = &ccw_pm_ops, |
8bbace7e CH |
2175 | }; |
2176 | ||
b2ffd8e9 CH |
2177 | /** |
2178 | * ccw_driver_register() - register a ccw driver | |
2179 | * @cdriver: driver to be registered | |
2180 | * | |
2181 | * This function is mainly a wrapper around driver_register(). | |
2182 | * Returns: | |
2183 | * %0 on success and a negative error value on failure. | |
2184 | */ | |
2185 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2186 | { |
2187 | struct device_driver *drv = &cdriver->driver; | |
2188 | ||
2189 | drv->bus = &ccw_bus_type; | |
2190 | drv->name = cdriver->name; | |
4beee646 | 2191 | drv->owner = cdriver->owner; |
1da177e4 LT |
2192 | |
2193 | return driver_register(drv); | |
2194 | } | |
2195 | ||
b2ffd8e9 CH |
2196 | /** |
2197 | * ccw_driver_unregister() - deregister a ccw driver | |
2198 | * @cdriver: driver to be deregistered | |
2199 | * | |
2200 | * This function is mainly a wrapper around driver_unregister(). | |
2201 | */ | |
2202 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2203 | { |
2204 | driver_unregister(&cdriver->driver); | |
2205 | } | |
2206 | ||
a8237fc4 CH |
2207 | /* Helper func for qdio. */ |
2208 | struct subchannel_id | |
2209 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
2210 | { | |
2211 | struct subchannel *sch; | |
2212 | ||
2213 | sch = to_subchannel(cdev->dev.parent); | |
2214 | return sch->schid; | |
2215 | } | |
2216 | ||
1da177e4 LT |
2217 | MODULE_LICENSE("GPL"); |
2218 | EXPORT_SYMBOL(ccw_device_set_online); | |
2219 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2220 | EXPORT_SYMBOL(ccw_driver_register); | |
2221 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2222 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
2223 | EXPORT_SYMBOL(ccw_bus_type); | |
2224 | EXPORT_SYMBOL(ccw_device_work); | |
a8237fc4 | 2225 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |