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 | ||
f7e5d67c | 141 | static struct css_driver io_subchannel_driver = { |
4beee646 | 142 | .owner = THIS_MODULE, |
f08adc00 | 143 | .subchannel_type = io_subchannel_ids, |
25b7bb58 | 144 | .name = "io_subchannel", |
1da177e4 | 145 | .irq = io_subchannel_irq, |
c820de39 CH |
146 | .sch_event = io_subchannel_sch_event, |
147 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
148 | .probe = io_subchannel_probe, |
149 | .remove = io_subchannel_remove, | |
150 | .shutdown = io_subchannel_shutdown, | |
1da177e4 LT |
151 | }; |
152 | ||
153 | struct workqueue_struct *ccw_device_work; | |
40154b82 PO |
154 | wait_queue_head_t ccw_device_init_wq; |
155 | atomic_t ccw_device_init_count; | |
1da177e4 | 156 | |
90ab1336 PO |
157 | static void recovery_func(unsigned long data); |
158 | ||
1da177e4 LT |
159 | static int __init |
160 | init_ccw_bus_type (void) | |
161 | { | |
162 | int ret; | |
163 | ||
164 | init_waitqueue_head(&ccw_device_init_wq); | |
165 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 166 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 LT |
167 | |
168 | ccw_device_work = create_singlethread_workqueue("cio"); | |
169 | if (!ccw_device_work) | |
170 | return -ENOMEM; /* FIXME: better errno ? */ | |
1da177e4 LT |
171 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); |
172 | if (!slow_path_wq) { | |
173 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
174 | goto out_err; | |
175 | } | |
176 | if ((ret = bus_register (&ccw_bus_type))) | |
177 | goto out_err; | |
178 | ||
25b7bb58 CH |
179 | ret = css_driver_register(&io_subchannel_driver); |
180 | if (ret) | |
1da177e4 LT |
181 | goto out_err; |
182 | ||
183 | wait_event(ccw_device_init_wq, | |
184 | atomic_read(&ccw_device_init_count) == 0); | |
185 | flush_workqueue(ccw_device_work); | |
186 | return 0; | |
187 | out_err: | |
188 | if (ccw_device_work) | |
189 | destroy_workqueue(ccw_device_work); | |
1da177e4 LT |
190 | if (slow_path_wq) |
191 | destroy_workqueue(slow_path_wq); | |
192 | return ret; | |
193 | } | |
194 | ||
195 | static void __exit | |
196 | cleanup_ccw_bus_type (void) | |
197 | { | |
25b7bb58 | 198 | css_driver_unregister(&io_subchannel_driver); |
1da177e4 | 199 | bus_unregister(&ccw_bus_type); |
1da177e4 LT |
200 | destroy_workqueue(ccw_device_work); |
201 | } | |
202 | ||
203 | subsys_initcall(init_ccw_bus_type); | |
204 | module_exit(cleanup_ccw_bus_type); | |
205 | ||
206 | /************************ device handling **************************/ | |
207 | ||
208 | /* | |
209 | * A ccw_device has some interfaces in sysfs in addition to the | |
210 | * standard ones. | |
211 | * The following entries are designed to export the information which | |
212 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
213 | * are obvious, so they don't have an entry :) | |
214 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
215 | */ | |
216 | static ssize_t | |
3fd3c0a5 | 217 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
218 | { |
219 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 220 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
221 | ssize_t ret = 0; |
222 | int chp; | |
7ad6a249 PO |
223 | int mask; |
224 | ||
225 | for (chp = 0; chp < 8; chp++) { | |
226 | mask = 0x80 >> chp; | |
227 | if (ssd->path_mask & mask) | |
228 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
229 | else | |
230 | ret += sprintf(buf + ret, "00 "); | |
231 | } | |
1da177e4 LT |
232 | ret += sprintf (buf+ret, "\n"); |
233 | return min((ssize_t)PAGE_SIZE, ret); | |
234 | } | |
235 | ||
236 | static ssize_t | |
3fd3c0a5 | 237 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
238 | { |
239 | struct subchannel *sch = to_subchannel(dev); | |
240 | struct pmcw *pmcw = &sch->schib.pmcw; | |
241 | ||
242 | return sprintf (buf, "%02x %02x %02x\n", | |
243 | pmcw->pim, pmcw->pam, pmcw->pom); | |
244 | } | |
245 | ||
246 | static ssize_t | |
3fd3c0a5 | 247 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
248 | { |
249 | struct ccw_device *cdev = to_ccwdev(dev); | |
250 | struct ccw_device_id *id = &(cdev->id); | |
251 | ||
252 | if (id->dev_type != 0) | |
253 | return sprintf(buf, "%04x/%02x\n", | |
254 | id->dev_type, id->dev_model); | |
255 | else | |
256 | return sprintf(buf, "n/a\n"); | |
257 | } | |
258 | ||
259 | static ssize_t | |
3fd3c0a5 | 260 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
261 | { |
262 | struct ccw_device *cdev = to_ccwdev(dev); | |
263 | struct ccw_device_id *id = &(cdev->id); | |
264 | ||
265 | return sprintf(buf, "%04x/%02x\n", | |
266 | id->cu_type, id->cu_model); | |
267 | } | |
268 | ||
f1fc78a8 BB |
269 | static ssize_t |
270 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
271 | { | |
272 | struct ccw_device *cdev = to_ccwdev(dev); | |
273 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 274 | int len; |
f1fc78a8 | 275 | |
086a6c62 | 276 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
277 | |
278 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
279 | } |
280 | ||
1da177e4 | 281 | static ssize_t |
3fd3c0a5 | 282 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
283 | { |
284 | struct ccw_device *cdev = to_ccwdev(dev); | |
285 | ||
286 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
287 | } | |
288 | ||
d7b5a4c9 CH |
289 | int ccw_device_is_orphan(struct ccw_device *cdev) |
290 | { | |
291 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
292 | } | |
293 | ||
ef99516c | 294 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 295 | { |
7674da77 | 296 | if (test_and_clear_bit(1, &cdev->private->registered)) |
ef99516c | 297 | device_del(&cdev->dev); |
7674da77 CH |
298 | } |
299 | ||
46fbe4e4 | 300 | static void ccw_device_remove_orphan_cb(struct work_struct *work) |
59a8a6e2 | 301 | { |
46fbe4e4 PO |
302 | struct ccw_device_private *priv; |
303 | struct ccw_device *cdev; | |
59a8a6e2 | 304 | |
46fbe4e4 PO |
305 | priv = container_of(work, struct ccw_device_private, kick_work); |
306 | cdev = priv->cdev; | |
59a8a6e2 CH |
307 | ccw_device_unregister(cdev); |
308 | put_device(&cdev->dev); | |
46fbe4e4 PO |
309 | /* Release cdev reference for workqueue processing. */ |
310 | put_device(&cdev->dev); | |
59a8a6e2 CH |
311 | } |
312 | ||
1da177e4 LT |
313 | static void |
314 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
315 | { | |
d7b5a4c9 | 316 | unsigned long flags; |
59a8a6e2 | 317 | |
1da177e4 LT |
318 | /* |
319 | * Forced offline in disconnected state means | |
320 | * 'throw away device'. | |
321 | */ | |
46fbe4e4 PO |
322 | /* Get cdev reference for workqueue processing. */ |
323 | if (!get_device(&cdev->dev)) | |
324 | return; | |
d7b5a4c9 | 325 | if (ccw_device_is_orphan(cdev)) { |
59a8a6e2 CH |
326 | /* |
327 | * Deregister ccw device. | |
328 | * Unfortunately, we cannot do this directly from the | |
329 | * attribute method. | |
330 | */ | |
d7b5a4c9 CH |
331 | spin_lock_irqsave(cdev->ccwlock, flags); |
332 | cdev->private->state = DEV_STATE_NOT_OPER; | |
333 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
46fbe4e4 PO |
334 | PREPARE_WORK(&cdev->private->kick_work, |
335 | ccw_device_remove_orphan_cb); | |
c4621a62 | 336 | queue_work(slow_path_wq, &cdev->private->kick_work); |
46fbe4e4 PO |
337 | } else |
338 | /* Deregister subchannel, which will kill the ccw device. */ | |
c4621a62 | 339 | ccw_device_schedule_sch_unregister(cdev); |
1da177e4 LT |
340 | } |
341 | ||
b2ffd8e9 CH |
342 | /** |
343 | * ccw_device_set_offline() - disable a ccw device for I/O | |
344 | * @cdev: target ccw device | |
345 | * | |
346 | * This function calls the driver's set_offline() function for @cdev, if | |
347 | * given, and then disables @cdev. | |
348 | * Returns: | |
349 | * %0 on success and a negative error value on failure. | |
350 | * Context: | |
351 | * enabled, ccw device lock not held | |
352 | */ | |
353 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 LT |
354 | { |
355 | int ret; | |
356 | ||
357 | if (!cdev) | |
358 | return -ENODEV; | |
359 | if (!cdev->online || !cdev->drv) | |
360 | return -EINVAL; | |
361 | ||
362 | if (cdev->drv->set_offline) { | |
363 | ret = cdev->drv->set_offline(cdev); | |
364 | if (ret != 0) | |
365 | return ret; | |
366 | } | |
367 | cdev->online = 0; | |
368 | spin_lock_irq(cdev->ccwlock); | |
369 | ret = ccw_device_offline(cdev); | |
370 | if (ret == -ENODEV) { | |
371 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
372 | cdev->private->state = DEV_STATE_OFFLINE; | |
373 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
374 | } | |
375 | spin_unlock_irq(cdev->ccwlock); | |
9cd67421 CH |
376 | /* Give up reference from ccw_device_set_online(). */ |
377 | put_device(&cdev->dev); | |
1da177e4 LT |
378 | return ret; |
379 | } | |
380 | spin_unlock_irq(cdev->ccwlock); | |
9cd67421 | 381 | if (ret == 0) { |
1da177e4 | 382 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
9cd67421 CH |
383 | /* Give up reference from ccw_device_set_online(). */ |
384 | put_device(&cdev->dev); | |
385 | } else { | |
139b83dd | 386 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
387 | "device 0.%x.%04x\n", |
388 | ret, cdev->private->dev_id.ssid, | |
389 | cdev->private->dev_id.devno); | |
1da177e4 LT |
390 | cdev->online = 1; |
391 | } | |
9cd67421 | 392 | return ret; |
1da177e4 LT |
393 | } |
394 | ||
b2ffd8e9 CH |
395 | /** |
396 | * ccw_device_set_online() - enable a ccw device for I/O | |
397 | * @cdev: target ccw device | |
398 | * | |
399 | * This function first enables @cdev and then calls the driver's set_online() | |
400 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
401 | * disabled again. | |
402 | * Returns: | |
403 | * %0 on success and a negative error value on failure. | |
404 | * Context: | |
405 | * enabled, ccw device lock not held | |
406 | */ | |
407 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
408 | { |
409 | int ret; | |
410 | ||
411 | if (!cdev) | |
412 | return -ENODEV; | |
413 | if (cdev->online || !cdev->drv) | |
414 | return -EINVAL; | |
9cd67421 CH |
415 | /* Hold on to an extra reference while device is online. */ |
416 | if (!get_device(&cdev->dev)) | |
417 | return -ENODEV; | |
1da177e4 LT |
418 | |
419 | spin_lock_irq(cdev->ccwlock); | |
420 | ret = ccw_device_online(cdev); | |
421 | spin_unlock_irq(cdev->ccwlock); | |
422 | if (ret == 0) | |
423 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
424 | else { | |
139b83dd | 425 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
426 | "device 0.%x.%04x\n", |
427 | ret, cdev->private->dev_id.ssid, | |
428 | cdev->private->dev_id.devno); | |
9cd67421 CH |
429 | /* Give up online reference since onlining failed. */ |
430 | put_device(&cdev->dev); | |
1da177e4 LT |
431 | return ret; |
432 | } | |
9cd67421 CH |
433 | if (cdev->private->state != DEV_STATE_ONLINE) { |
434 | /* Give up online reference since onlining failed. */ | |
435 | put_device(&cdev->dev); | |
1da177e4 | 436 | return -ENODEV; |
9cd67421 | 437 | } |
1da177e4 LT |
438 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { |
439 | cdev->online = 1; | |
440 | return 0; | |
441 | } | |
442 | spin_lock_irq(cdev->ccwlock); | |
443 | ret = ccw_device_offline(cdev); | |
444 | spin_unlock_irq(cdev->ccwlock); | |
445 | if (ret == 0) | |
446 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
e556bbbd | 447 | else |
139b83dd | 448 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
449 | "device 0.%x.%04x\n", |
450 | ret, cdev->private->dev_id.ssid, | |
451 | cdev->private->dev_id.devno); | |
9cd67421 CH |
452 | /* Give up online reference since onlining failed. */ |
453 | put_device(&cdev->dev); | |
6cadb78b | 454 | return (ret == 0) ? -ENODEV : ret; |
1da177e4 LT |
455 | } |
456 | ||
e74fe0ce | 457 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 CH |
458 | { |
459 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
460 | ccw_device_remove_disconnected(cdev); | |
e74fe0ce SO |
461 | else if (cdev->online && cdev->drv && cdev->drv->set_offline) |
462 | return ccw_device_set_offline(cdev); | |
463 | return 0; | |
f5ba6c86 CH |
464 | } |
465 | ||
466 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
467 | { | |
468 | int ret; | |
469 | ||
470 | /* Do device recognition, if needed. */ | |
99f6a570 | 471 | if (cdev->private->state == DEV_STATE_BOXED) { |
f5ba6c86 CH |
472 | ret = ccw_device_recognition(cdev); |
473 | if (ret) { | |
e556bbbd CH |
474 | CIO_MSG_EVENT(0, "Couldn't start recognition " |
475 | "for device 0.%x.%04x (ret=%d)\n", | |
476 | cdev->private->dev_id.ssid, | |
477 | cdev->private->dev_id.devno, ret); | |
f5ba6c86 CH |
478 | return ret; |
479 | } | |
480 | wait_event(cdev->private->wait_q, | |
481 | cdev->private->flags.recog_done); | |
156013ff SO |
482 | if (cdev->private->state != DEV_STATE_OFFLINE) |
483 | /* recognition failed */ | |
484 | return -EAGAIN; | |
f5ba6c86 CH |
485 | } |
486 | if (cdev->drv && cdev->drv->set_online) | |
487 | ccw_device_set_online(cdev); | |
488 | return 0; | |
489 | } | |
156013ff | 490 | |
c78aa6cb | 491 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
492 | { |
493 | int ret; | |
494 | ||
495 | ret = online_store_recog_and_online(cdev); | |
156013ff | 496 | if (ret && !force) |
c78aa6cb | 497 | return ret; |
f5ba6c86 CH |
498 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
499 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
500 | if (ret) |
501 | return ret; | |
f5ba6c86 CH |
502 | if (cdev->id.cu_type == 0) |
503 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
504 | ret = online_store_recog_and_online(cdev); |
505 | if (ret) | |
506 | return ret; | |
f5ba6c86 | 507 | } |
c78aa6cb | 508 | return 0; |
f5ba6c86 CH |
509 | } |
510 | ||
511 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
512 | const char *buf, size_t count) | |
1da177e4 LT |
513 | { |
514 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
515 | int force, ret; |
516 | unsigned long i; | |
1da177e4 | 517 | |
b5cd99e6 SO |
518 | if ((cdev->private->state != DEV_STATE_OFFLINE && |
519 | cdev->private->state != DEV_STATE_ONLINE && | |
520 | cdev->private->state != DEV_STATE_BOXED && | |
521 | cdev->private->state != DEV_STATE_DISCONNECTED) || | |
522 | atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) | |
1da177e4 LT |
523 | return -EAGAIN; |
524 | ||
525 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
526 | atomic_set(&cdev->private->onoff, 0); | |
527 | return -EINVAL; | |
528 | } | |
529 | if (!strncmp(buf, "force\n", count)) { | |
530 | force = 1; | |
531 | i = 1; | |
2f972202 | 532 | ret = 0; |
1da177e4 LT |
533 | } else { |
534 | force = 0; | |
2f972202 | 535 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 536 | } |
2f972202 CH |
537 | if (ret) |
538 | goto out; | |
f5ba6c86 CH |
539 | switch (i) { |
540 | case 0: | |
e74fe0ce | 541 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
542 | break; |
543 | case 1: | |
c78aa6cb | 544 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
545 | break; |
546 | default: | |
2f972202 | 547 | ret = -EINVAL; |
1da177e4 | 548 | } |
2f972202 | 549 | out: |
1da177e4 LT |
550 | if (cdev->drv) |
551 | module_put(cdev->drv->owner); | |
552 | atomic_set(&cdev->private->onoff, 0); | |
e74fe0ce | 553 | return (ret < 0) ? ret : count; |
1da177e4 LT |
554 | } |
555 | ||
556 | static ssize_t | |
3fd3c0a5 | 557 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
558 | { |
559 | struct ccw_device *cdev = to_ccwdev(dev); | |
560 | struct subchannel *sch; | |
561 | ||
d7b5a4c9 CH |
562 | if (ccw_device_is_orphan(cdev)) |
563 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
564 | switch (cdev->private->state) { |
565 | case DEV_STATE_BOXED: | |
566 | return sprintf(buf, "boxed\n"); | |
567 | case DEV_STATE_DISCONNECTED: | |
568 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
569 | case DEV_STATE_NOT_OPER: | |
570 | sch = to_subchannel(dev->parent); | |
571 | if (!sch->lpm) | |
572 | return sprintf(buf, "no path\n"); | |
573 | else | |
574 | return sprintf(buf, "no device\n"); | |
575 | default: | |
576 | /* All other states considered fine. */ | |
577 | return sprintf(buf, "good\n"); | |
578 | } | |
579 | } | |
580 | ||
581 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
582 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
583 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
584 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 585 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 586 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
587 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
588 | ||
7e9db9ea | 589 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
590 | &dev_attr_chpids.attr, |
591 | &dev_attr_pimpampom.attr, | |
592 | NULL, | |
593 | }; | |
594 | ||
7e9db9ea CH |
595 | static struct attribute_group io_subchannel_attr_group = { |
596 | .attrs = io_subchannel_attrs, | |
529192f3 | 597 | }; |
1da177e4 LT |
598 | |
599 | static struct attribute * ccwdev_attrs[] = { | |
600 | &dev_attr_devtype.attr, | |
601 | &dev_attr_cutype.attr, | |
f1fc78a8 | 602 | &dev_attr_modalias.attr, |
1da177e4 LT |
603 | &dev_attr_online.attr, |
604 | &dev_attr_cmb_enable.attr, | |
605 | &dev_attr_availability.attr, | |
606 | NULL, | |
607 | }; | |
608 | ||
609 | static struct attribute_group ccwdev_attr_group = { | |
610 | .attrs = ccwdev_attrs, | |
611 | }; | |
612 | ||
f7e5d67c | 613 | static struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
614 | &ccwdev_attr_group, |
615 | NULL, | |
616 | }; | |
1da177e4 LT |
617 | |
618 | /* this is a simple abstraction for device_register that sets the | |
619 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 620 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
621 | { |
622 | struct device *dev = &cdev->dev; | |
623 | int ret; | |
624 | ||
625 | dev->bus = &ccw_bus_type; | |
626 | ||
627 | if ((ret = device_add(dev))) | |
628 | return ret; | |
629 | ||
630 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
631 | return ret; |
632 | } | |
633 | ||
b0744bd2 | 634 | struct match_data { |
78964268 | 635 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
636 | struct ccw_device * sibling; |
637 | }; | |
638 | ||
639 | static int | |
640 | match_devno(struct device * dev, void * data) | |
641 | { | |
78964268 | 642 | struct match_data * d = data; |
b0744bd2 CH |
643 | struct ccw_device * cdev; |
644 | ||
645 | cdev = to_ccwdev(dev); | |
646 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 647 | !ccw_device_is_orphan(cdev) && |
78964268 | 648 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 649 | (cdev != d->sibling)) |
b0744bd2 | 650 | return 1; |
b0744bd2 CH |
651 | return 0; |
652 | } | |
653 | ||
78964268 CH |
654 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
655 | struct ccw_device *sibling) | |
1da177e4 | 656 | { |
1da177e4 | 657 | struct device *dev; |
292888c8 | 658 | struct match_data data; |
1da177e4 | 659 | |
78964268 | 660 | data.dev_id = *dev_id; |
292888c8 | 661 | data.sibling = sibling; |
e5945b4f | 662 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 663 | |
b0744bd2 | 664 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
665 | } |
666 | ||
d7b5a4c9 CH |
667 | static int match_orphan(struct device *dev, void *data) |
668 | { | |
669 | struct ccw_dev_id *dev_id; | |
670 | struct ccw_device *cdev; | |
671 | ||
672 | dev_id = data; | |
673 | cdev = to_ccwdev(dev); | |
674 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
675 | } | |
676 | ||
677 | static struct ccw_device * | |
678 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
679 | struct ccw_dev_id *dev_id) | |
680 | { | |
681 | struct device *dev; | |
682 | ||
683 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
684 | match_orphan); | |
685 | ||
686 | return dev ? to_ccwdev(dev) : NULL; | |
687 | } | |
688 | ||
eb32ae8d | 689 | void ccw_device_do_unbind_bind(struct work_struct *work) |
1da177e4 | 690 | { |
c1637532 | 691 | struct ccw_device_private *priv; |
1da177e4 LT |
692 | struct ccw_device *cdev; |
693 | struct subchannel *sch; | |
eb32ae8d | 694 | int ret; |
1da177e4 | 695 | |
c1637532 MS |
696 | priv = container_of(work, struct ccw_device_private, kick_work); |
697 | cdev = priv->cdev; | |
1da177e4 | 698 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 699 | |
eb32ae8d CH |
700 | if (test_bit(1, &cdev->private->registered)) { |
701 | device_release_driver(&cdev->dev); | |
702 | ret = device_attach(&cdev->dev); | |
703 | WARN_ON(ret == -ENODEV); | |
704 | } | |
1da177e4 LT |
705 | } |
706 | ||
707 | static void | |
708 | ccw_device_release(struct device *dev) | |
709 | { | |
710 | struct ccw_device *cdev; | |
711 | ||
712 | cdev = to_ccwdev(dev); | |
6eff208f CH |
713 | /* Release reference of parent subchannel. */ |
714 | put_device(cdev->dev.parent); | |
1da177e4 LT |
715 | kfree(cdev->private); |
716 | kfree(cdev); | |
717 | } | |
718 | ||
7674da77 CH |
719 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
720 | { | |
721 | struct ccw_device *cdev; | |
722 | ||
723 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
724 | if (cdev) { | |
725 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
726 | GFP_KERNEL | GFP_DMA); | |
727 | if (cdev->private) | |
728 | return cdev; | |
729 | } | |
730 | kfree(cdev); | |
731 | return ERR_PTR(-ENOMEM); | |
732 | } | |
733 | ||
734 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
735 | struct ccw_device *cdev) | |
736 | { | |
737 | cdev->private->cdev = cdev; | |
738 | atomic_set(&cdev->private->onoff, 0); | |
739 | cdev->dev.parent = &sch->dev; | |
740 | cdev->dev.release = ccw_device_release; | |
33583c36 | 741 | INIT_WORK(&cdev->private->kick_work, NULL); |
ef99516c | 742 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
743 | /* Do first half of device_register. */ |
744 | device_initialize(&cdev->dev); | |
745 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
746 | /* Release reference from device_initialize(). */ |
747 | put_device(&cdev->dev); | |
7674da77 CH |
748 | return -ENODEV; |
749 | } | |
750 | return 0; | |
751 | } | |
752 | ||
753 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
754 | { | |
755 | struct ccw_device *cdev; | |
756 | int ret; | |
757 | ||
758 | cdev = io_subchannel_allocate_dev(sch); | |
759 | if (!IS_ERR(cdev)) { | |
760 | ret = io_subchannel_initialize_dev(sch, cdev); | |
761 | if (ret) { | |
762 | kfree(cdev); | |
763 | cdev = ERR_PTR(ret); | |
764 | } | |
765 | } | |
766 | return cdev; | |
767 | } | |
768 | ||
d7b5a4c9 CH |
769 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
770 | ||
771 | static void sch_attach_device(struct subchannel *sch, | |
772 | struct ccw_device *cdev) | |
773 | { | |
82b7ac05 | 774 | css_update_ssd_info(sch); |
d7b5a4c9 | 775 | spin_lock_irq(sch->lock); |
db6a6423 | 776 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
777 | cdev->private->schid = sch->schid; |
778 | cdev->ccwlock = sch->lock; | |
c820de39 | 779 | ccw_device_trigger_reprobe(cdev); |
d7b5a4c9 CH |
780 | spin_unlock_irq(sch->lock); |
781 | } | |
782 | ||
783 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
784 | struct ccw_device *cdev) | |
785 | { | |
786 | struct subchannel *other_sch; | |
787 | int ret; | |
788 | ||
6eff208f CH |
789 | /* Get reference for new parent. */ |
790 | if (!get_device(&sch->dev)) | |
791 | return; | |
792 | other_sch = to_subchannel(cdev->dev.parent); | |
793 | /* Note: device_move() changes cdev->dev.parent */ | |
ffa6a705 | 794 | ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 | 795 | if (ret) { |
139b83dd | 796 | CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed " |
d7b5a4c9 CH |
797 | "(ret=%d)!\n", cdev->private->dev_id.ssid, |
798 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
799 | /* Put reference for new parent. */ |
800 | put_device(&sch->dev); | |
d7b5a4c9 CH |
801 | return; |
802 | } | |
db6a6423 | 803 | sch_set_cdev(other_sch, NULL); |
d7b5a4c9 CH |
804 | /* No need to keep a subchannel without ccw device around. */ |
805 | css_sch_device_unregister(other_sch); | |
d7b5a4c9 | 806 | sch_attach_device(sch, cdev); |
6eff208f CH |
807 | /* Put reference for old parent. */ |
808 | put_device(&other_sch->dev); | |
d7b5a4c9 CH |
809 | } |
810 | ||
811 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
812 | struct ccw_device *cdev) | |
813 | { | |
814 | int ret; | |
6eff208f | 815 | struct subchannel *pseudo_sch; |
d7b5a4c9 | 816 | |
6eff208f CH |
817 | /* Get reference for new parent. */ |
818 | if (!get_device(&sch->dev)) | |
819 | return; | |
820 | pseudo_sch = to_subchannel(cdev->dev.parent); | |
821 | /* | |
822 | * Try to move the ccw device to its new subchannel. | |
823 | * Note: device_move() changes cdev->dev.parent | |
824 | */ | |
ffa6a705 | 825 | ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
826 | if (ret) { |
827 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
828 | "failed (ret=%d)!\n", | |
829 | cdev->private->dev_id.ssid, | |
830 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
831 | /* Put reference for new parent. */ |
832 | put_device(&sch->dev); | |
d7b5a4c9 CH |
833 | return; |
834 | } | |
835 | sch_attach_device(sch, cdev); | |
6eff208f CH |
836 | /* Put reference on pseudo subchannel. */ |
837 | put_device(&pseudo_sch->dev); | |
d7b5a4c9 CH |
838 | } |
839 | ||
840 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
841 | { | |
842 | struct ccw_device *cdev; | |
843 | ||
844 | /* Need to allocate a new ccw device. */ | |
845 | cdev = io_subchannel_create_ccwdev(sch); | |
846 | if (IS_ERR(cdev)) { | |
847 | /* OK, we did everything we could... */ | |
848 | css_sch_device_unregister(sch); | |
849 | return; | |
850 | } | |
851 | spin_lock_irq(sch->lock); | |
db6a6423 | 852 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
853 | spin_unlock_irq(sch->lock); |
854 | /* Start recognition for the new ccw device. */ | |
855 | if (io_subchannel_recog(cdev, sch)) { | |
856 | spin_lock_irq(sch->lock); | |
db6a6423 | 857 | sch_set_cdev(sch, NULL); |
d7b5a4c9 | 858 | spin_unlock_irq(sch->lock); |
d7b5a4c9 | 859 | css_sch_device_unregister(sch); |
6eff208f CH |
860 | /* Put reference from io_subchannel_create_ccwdev(). */ |
861 | put_device(&sch->dev); | |
862 | /* Give up initial reference. */ | |
863 | put_device(&cdev->dev); | |
d7b5a4c9 CH |
864 | } |
865 | } | |
866 | ||
867 | ||
868 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
869 | { | |
870 | struct ccw_device_private *priv; | |
871 | struct ccw_device *cdev; | |
872 | struct ccw_device *replacing_cdev; | |
873 | struct subchannel *sch; | |
874 | int ret; | |
875 | struct channel_subsystem *css; | |
876 | struct ccw_dev_id dev_id; | |
877 | ||
878 | priv = container_of(work, struct ccw_device_private, kick_work); | |
879 | cdev = priv->cdev; | |
880 | sch = to_subchannel(cdev->dev.parent); | |
881 | css = to_css(sch->dev.parent); | |
882 | dev_id.devno = sch->schib.pmcw.dev; | |
883 | dev_id.ssid = sch->schid.ssid; | |
884 | ||
6eff208f CH |
885 | /* Increase refcount for pseudo subchannel. */ |
886 | get_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 CH |
887 | /* |
888 | * Move the orphaned ccw device to the orphanage so the replacing | |
889 | * ccw device can take its place on the subchannel. | |
6eff208f | 890 | * Note: device_move() changes cdev->dev.parent |
d7b5a4c9 | 891 | */ |
ffa6a705 CH |
892 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev, |
893 | DPM_ORDER_NONE); | |
d7b5a4c9 CH |
894 | if (ret) { |
895 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
896 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
897 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
898 | /* Decrease refcount for pseudo subchannel again. */ |
899 | put_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 CH |
900 | return; |
901 | } | |
902 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
903 | /* | |
904 | * Search for the replacing ccw device | |
905 | * - among the disconnected devices | |
906 | * - in the orphanage | |
907 | */ | |
908 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
909 | if (replacing_cdev) { | |
910 | sch_attach_disconnected_device(sch, replacing_cdev); | |
85acc407 | 911 | /* Release reference from get_disc_ccwdev_by_dev_id() */ |
97166f52 | 912 | put_device(&replacing_cdev->dev); |
6eff208f CH |
913 | /* Release reference of subchannel from old cdev. */ |
914 | put_device(&sch->dev); | |
d7b5a4c9 CH |
915 | return; |
916 | } | |
917 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
918 | if (replacing_cdev) { | |
919 | sch_attach_orphaned_device(sch, replacing_cdev); | |
85acc407 | 920 | /* Release reference from get_orphaned_ccwdev_by_dev_id() */ |
97166f52 | 921 | put_device(&replacing_cdev->dev); |
6eff208f CH |
922 | /* Release reference of subchannel from old cdev. */ |
923 | put_device(&sch->dev); | |
d7b5a4c9 CH |
924 | return; |
925 | } | |
926 | sch_create_and_recog_new_device(sch); | |
6eff208f CH |
927 | /* Release reference of subchannel from old cdev. */ |
928 | put_device(&sch->dev); | |
d7b5a4c9 CH |
929 | } |
930 | ||
1da177e4 LT |
931 | /* |
932 | * Register recognized device. | |
933 | */ | |
934 | static void | |
c1637532 | 935 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 936 | { |
c1637532 | 937 | struct ccw_device_private *priv; |
1da177e4 LT |
938 | struct ccw_device *cdev; |
939 | struct subchannel *sch; | |
940 | int ret; | |
941 | unsigned long flags; | |
942 | ||
c1637532 MS |
943 | priv = container_of(work, struct ccw_device_private, kick_work); |
944 | cdev = priv->cdev; | |
1da177e4 | 945 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
946 | /* |
947 | * Check if subchannel is still registered. It may have become | |
948 | * unregistered if a machine check hit us after finishing | |
949 | * device recognition but before the register work could be | |
950 | * queued. | |
951 | */ | |
952 | if (!device_is_registered(&sch->dev)) | |
953 | goto out_err; | |
82b7ac05 | 954 | css_update_ssd_info(sch); |
47af5518 CH |
955 | /* |
956 | * io_subchannel_register() will also be called after device | |
957 | * recognition has been done for a boxed device (which will already | |
958 | * be registered). We need to reprobe since we may now have sense id | |
959 | * information. | |
960 | */ | |
d6a30761 | 961 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
962 | if (!cdev->drv) { |
963 | ret = device_reprobe(&cdev->dev); | |
964 | if (ret) | |
965 | /* We can't do much here. */ | |
139b83dd | 966 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
967 | " %d for 0.%x.%04x\n", ret, |
968 | cdev->private->dev_id.ssid, | |
969 | cdev->private->dev_id.devno); | |
47af5518 | 970 | } |
1da177e4 LT |
971 | goto out; |
972 | } | |
fa1a8c23 CH |
973 | /* |
974 | * Now we know this subchannel will stay, we can throw | |
975 | * our delayed uevent. | |
976 | */ | |
f67f129e | 977 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 978 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
979 | /* make it known to the system */ |
980 | ret = ccw_device_register(cdev); | |
981 | if (ret) { | |
e556bbbd CH |
982 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
983 | cdev->private->dev_id.ssid, | |
984 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 985 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 986 | sch_set_cdev(sch, NULL); |
2ec22984 | 987 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
988 | /* Release initial device reference. */ |
989 | put_device(&cdev->dev); | |
5fb6b854 | 990 | goto out_err; |
1da177e4 | 991 | } |
1da177e4 LT |
992 | out: |
993 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 994 | wake_up(&cdev->private->wait_q); |
5fb6b854 CH |
995 | out_err: |
996 | /* Release reference for workqueue processing. */ | |
997 | put_device(&cdev->dev); | |
1da177e4 LT |
998 | if (atomic_dec_and_test(&ccw_device_init_count)) |
999 | wake_up(&ccw_device_init_wq); | |
1000 | } | |
1001 | ||
3f4cf6e7 | 1002 | static void ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 1003 | { |
c1637532 MS |
1004 | struct ccw_device_private *priv; |
1005 | struct ccw_device *cdev; | |
1da177e4 LT |
1006 | struct subchannel *sch; |
1007 | ||
c1637532 MS |
1008 | priv = container_of(work, struct ccw_device_private, kick_work); |
1009 | cdev = priv->cdev; | |
46fbe4e4 PO |
1010 | /* Get subchannel reference for local processing. */ |
1011 | if (!get_device(cdev->dev.parent)) | |
1012 | return; | |
1da177e4 | 1013 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 1014 | css_sch_device_unregister(sch); |
1da177e4 | 1015 | /* Reset intparm to zeroes. */ |
13952ec1 SO |
1016 | sch->config.intparm = 0; |
1017 | cio_commit_config(sch); | |
46fbe4e4 | 1018 | /* Release cdev reference for workqueue processing.*/ |
1da177e4 | 1019 | put_device(&cdev->dev); |
46fbe4e4 | 1020 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
1021 | put_device(&sch->dev); |
1022 | } | |
1023 | ||
c4621a62 SO |
1024 | void ccw_device_schedule_sch_unregister(struct ccw_device *cdev) |
1025 | { | |
1026 | PREPARE_WORK(&cdev->private->kick_work, | |
1027 | ccw_device_call_sch_unregister); | |
1028 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1029 | } | |
1030 | ||
1da177e4 LT |
1031 | /* |
1032 | * subchannel recognition done. Called from the state machine. | |
1033 | */ | |
1034 | void | |
1035 | io_subchannel_recog_done(struct ccw_device *cdev) | |
1036 | { | |
1da177e4 LT |
1037 | if (css_init_done == 0) { |
1038 | cdev->private->flags.recog_done = 1; | |
1039 | return; | |
1040 | } | |
1041 | switch (cdev->private->state) { | |
47593bfa SO |
1042 | case DEV_STATE_BOXED: |
1043 | /* Device did not respond in time. */ | |
1da177e4 LT |
1044 | case DEV_STATE_NOT_OPER: |
1045 | cdev->private->flags.recog_done = 1; | |
1046 | /* Remove device found not operational. */ | |
1047 | if (!get_device(&cdev->dev)) | |
1048 | break; | |
c4621a62 | 1049 | ccw_device_schedule_sch_unregister(cdev); |
1da177e4 LT |
1050 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1051 | wake_up(&ccw_device_init_wq); | |
1052 | break; | |
1da177e4 LT |
1053 | case DEV_STATE_OFFLINE: |
1054 | /* | |
1055 | * We can't register the device in interrupt context so | |
1056 | * we schedule a work item. | |
1057 | */ | |
1058 | if (!get_device(&cdev->dev)) | |
1059 | break; | |
1060 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1061 | io_subchannel_register); |
1da177e4 LT |
1062 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1063 | break; | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | static int | |
1068 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
1069 | { | |
1070 | int rc; | |
1071 | struct ccw_device_private *priv; | |
1072 | ||
db6a6423 | 1073 | sch_set_cdev(sch, cdev); |
2ec22984 | 1074 | cdev->ccwlock = sch->lock; |
fb6958a5 | 1075 | |
1da177e4 LT |
1076 | /* Init private data. */ |
1077 | priv = cdev->private; | |
78964268 CH |
1078 | priv->dev_id.devno = sch->schib.pmcw.dev; |
1079 | priv->dev_id.ssid = sch->schid.ssid; | |
1080 | priv->schid = sch->schid; | |
1da177e4 LT |
1081 | priv->state = DEV_STATE_NOT_OPER; |
1082 | INIT_LIST_HEAD(&priv->cmb_list); | |
1083 | init_waitqueue_head(&priv->wait_q); | |
1084 | init_timer(&priv->timer); | |
1085 | ||
1086 | /* Set an initial name for the device. */ | |
1f4e7eda CH |
1087 | if (cio_is_console(sch->schid)) |
1088 | cdev->dev.init_name = cio_get_console_cdev_name(sch); | |
1089 | else | |
1090 | dev_set_name(&cdev->dev, "0.%x.%04x", | |
1091 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 LT |
1092 | |
1093 | /* Increase counter of devices currently in recognition. */ | |
1094 | atomic_inc(&ccw_device_init_count); | |
1095 | ||
1096 | /* Start async. device sensing. */ | |
2ec22984 | 1097 | spin_lock_irq(sch->lock); |
1da177e4 | 1098 | rc = ccw_device_recognition(cdev); |
2ec22984 | 1099 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
1100 | if (rc) { |
1101 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1102 | wake_up(&ccw_device_init_wq); | |
1103 | } | |
1104 | return rc; | |
1105 | } | |
1106 | ||
d7b5a4c9 CH |
1107 | static void ccw_device_move_to_sch(struct work_struct *work) |
1108 | { | |
1109 | struct ccw_device_private *priv; | |
1110 | int rc; | |
1111 | struct subchannel *sch; | |
1112 | struct ccw_device *cdev; | |
1113 | struct subchannel *former_parent; | |
1114 | ||
1115 | priv = container_of(work, struct ccw_device_private, kick_work); | |
1116 | sch = priv->sch; | |
1117 | cdev = priv->cdev; | |
6eff208f CH |
1118 | former_parent = to_subchannel(cdev->dev.parent); |
1119 | /* Get reference for new parent. */ | |
1120 | if (!get_device(&sch->dev)) | |
1121 | return; | |
d7b5a4c9 | 1122 | mutex_lock(&sch->reg_mutex); |
6eff208f CH |
1123 | /* |
1124 | * Try to move the ccw device to its new subchannel. | |
1125 | * Note: device_move() changes cdev->dev.parent | |
1126 | */ | |
ffa6a705 | 1127 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
1128 | mutex_unlock(&sch->reg_mutex); |
1129 | if (rc) { | |
139b83dd | 1130 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel " |
d7b5a4c9 CH |
1131 | "0.%x.%04x failed (ret=%d)!\n", |
1132 | cdev->private->dev_id.ssid, | |
1133 | cdev->private->dev_id.devno, sch->schid.ssid, | |
1134 | sch->schid.sch_no, rc); | |
1135 | css_sch_device_unregister(sch); | |
6eff208f CH |
1136 | /* Put reference for new parent again. */ |
1137 | put_device(&sch->dev); | |
d7b5a4c9 CH |
1138 | goto out; |
1139 | } | |
6eff208f | 1140 | if (!sch_is_pseudo_sch(former_parent)) { |
d7b5a4c9 | 1141 | spin_lock_irq(former_parent->lock); |
db6a6423 | 1142 | sch_set_cdev(former_parent, NULL); |
d7b5a4c9 CH |
1143 | spin_unlock_irq(former_parent->lock); |
1144 | css_sch_device_unregister(former_parent); | |
1145 | /* Reset intparm to zeroes. */ | |
13952ec1 SO |
1146 | former_parent->config.intparm = 0; |
1147 | cio_commit_config(former_parent); | |
d7b5a4c9 CH |
1148 | } |
1149 | sch_attach_device(sch, cdev); | |
1150 | out: | |
6eff208f CH |
1151 | /* Put reference for old parent. */ |
1152 | put_device(&former_parent->dev); | |
d7b5a4c9 CH |
1153 | put_device(&cdev->dev); |
1154 | } | |
1155 | ||
602b20f2 CH |
1156 | static void io_subchannel_irq(struct subchannel *sch) |
1157 | { | |
1158 | struct ccw_device *cdev; | |
1159 | ||
db6a6423 | 1160 | cdev = sch_get_cdev(sch); |
602b20f2 CH |
1161 | |
1162 | CIO_TRACE_EVENT(3, "IRQ"); | |
2a0217d5 | 1163 | CIO_TRACE_EVENT(3, dev_name(&sch->dev)); |
602b20f2 CH |
1164 | if (cdev) |
1165 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1166 | } | |
1167 | ||
13952ec1 SO |
1168 | void io_subchannel_init_config(struct subchannel *sch) |
1169 | { | |
1170 | memset(&sch->config, 0, sizeof(sch->config)); | |
1171 | sch->config.csense = 1; | |
d36f0c66 SO |
1172 | /* Use subchannel mp mode when there is more than 1 installed CHPID. */ |
1173 | if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0) | |
13952ec1 SO |
1174 | sch->config.mp = 1; |
1175 | } | |
1176 | ||
0ae7a7b2 CH |
1177 | static void io_subchannel_init_fields(struct subchannel *sch) |
1178 | { | |
1179 | if (cio_is_console(sch->schid)) | |
1180 | sch->opm = 0xff; | |
1181 | else | |
1182 | sch->opm = chp_get_sch_opm(sch); | |
1183 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1184 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1185 | |
1186 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1187 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1188 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1189 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1190 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1191 | |
1192 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1193 | } |
1194 | ||
90ed2b69 CH |
1195 | static void io_subchannel_do_unreg(struct work_struct *work) |
1196 | { | |
1197 | struct subchannel *sch; | |
1198 | ||
1199 | sch = container_of(work, struct subchannel, work); | |
1200 | css_sch_device_unregister(sch); | |
1201 | /* Reset intparm to zeroes. */ | |
13952ec1 SO |
1202 | sch->config.intparm = 0; |
1203 | cio_commit_config(sch); | |
90ed2b69 CH |
1204 | put_device(&sch->dev); |
1205 | } | |
1206 | ||
1207 | /* Schedule unregister if we have no cdev. */ | |
1208 | static void io_subchannel_schedule_removal(struct subchannel *sch) | |
1209 | { | |
1210 | get_device(&sch->dev); | |
1211 | INIT_WORK(&sch->work, io_subchannel_do_unreg); | |
1212 | queue_work(slow_path_wq, &sch->work); | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Note: We always return 0 so that we bind to the device even on error. | |
1217 | * This is needed so that our remove function is called on unregister. | |
1218 | */ | |
0ae7a7b2 | 1219 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1220 | { |
1da177e4 LT |
1221 | struct ccw_device *cdev; |
1222 | int rc; | |
1223 | unsigned long flags; | |
d7b5a4c9 | 1224 | struct ccw_dev_id dev_id; |
1da177e4 | 1225 | |
db6a6423 CH |
1226 | cdev = sch_get_cdev(sch); |
1227 | if (cdev) { | |
7e9db9ea CH |
1228 | rc = sysfs_create_group(&sch->dev.kobj, |
1229 | &io_subchannel_attr_group); | |
1230 | if (rc) | |
1231 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1232 | "attributes for subchannel " | |
1233 | "0.%x.%04x (rc=%d)\n", | |
1234 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 LT |
1235 | /* |
1236 | * This subchannel already has an associated ccw_device. | |
7e9db9ea CH |
1237 | * Throw the delayed uevent for the subchannel, register |
1238 | * the ccw_device and exit. This happens for all early | |
1239 | * devices, e.g. the console. | |
1da177e4 | 1240 | */ |
f67f129e | 1241 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1242 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
e1031786 | 1243 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1244 | device_initialize(&cdev->dev); |
1245 | ccw_device_register(cdev); | |
1da177e4 LT |
1246 | /* |
1247 | * Check if the device is already online. If it is | |
9cd67421 CH |
1248 | * the reference count needs to be corrected since we |
1249 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1250 | */ |
1251 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1252 | cdev->private->state != DEV_STATE_OFFLINE && | |
1253 | cdev->private->state != DEV_STATE_BOXED) | |
1254 | get_device(&cdev->dev); | |
1255 | return 0; | |
1256 | } | |
0ae7a7b2 | 1257 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1258 | rc = cio_commit_config(sch); |
1259 | if (rc) | |
1260 | goto out_schedule; | |
7e9db9ea CH |
1261 | rc = sysfs_create_group(&sch->dev.kobj, |
1262 | &io_subchannel_attr_group); | |
1263 | if (rc) | |
90ed2b69 | 1264 | goto out_schedule; |
cd6b4f27 CH |
1265 | /* Allocate I/O subchannel private data. */ |
1266 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1267 | GFP_KERNEL | GFP_DMA); | |
90ed2b69 | 1268 | if (!sch->private) |
7e9db9ea | 1269 | goto out_err; |
111e95a4 SO |
1270 | /* |
1271 | * First check if a fitting device may be found amongst the | |
1272 | * disconnected devices or in the orphanage. | |
1273 | */ | |
1274 | dev_id.devno = sch->schib.pmcw.dev; | |
1275 | dev_id.ssid = sch->schid.ssid; | |
d7b5a4c9 CH |
1276 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); |
1277 | if (!cdev) | |
1278 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1279 | &dev_id); | |
1280 | if (cdev) { | |
1281 | /* | |
1282 | * Schedule moving the device until when we have a registered | |
1283 | * subchannel to move to and succeed the probe. We can | |
1284 | * unregister later again, when the probe is through. | |
1285 | */ | |
1286 | cdev->private->sch = sch; | |
1287 | PREPARE_WORK(&cdev->private->kick_work, | |
1288 | ccw_device_move_to_sch); | |
1289 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1290 | return 0; | |
1291 | } | |
7674da77 | 1292 | cdev = io_subchannel_create_ccwdev(sch); |
90ed2b69 | 1293 | if (IS_ERR(cdev)) |
7e9db9ea | 1294 | goto out_err; |
8bbace7e | 1295 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1296 | if (rc) { |
2ec22984 | 1297 | spin_lock_irqsave(sch->lock, flags); |
90ed2b69 | 1298 | io_subchannel_recog_done(cdev); |
2ec22984 | 1299 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 | 1300 | } |
7e9db9ea CH |
1301 | return 0; |
1302 | out_err: | |
1303 | kfree(sch->private); | |
1304 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); | |
90ed2b69 CH |
1305 | out_schedule: |
1306 | io_subchannel_schedule_removal(sch); | |
1307 | return 0; | |
1da177e4 LT |
1308 | } |
1309 | ||
1da177e4 | 1310 | static int |
8bbace7e | 1311 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1312 | { |
1313 | struct ccw_device *cdev; | |
1314 | unsigned long flags; | |
1315 | ||
db6a6423 CH |
1316 | cdev = sch_get_cdev(sch); |
1317 | if (!cdev) | |
1da177e4 | 1318 | return 0; |
1da177e4 LT |
1319 | /* Set ccw device to not operational and drop reference. */ |
1320 | spin_lock_irqsave(cdev->ccwlock, flags); | |
db6a6423 | 1321 | sch_set_cdev(sch, NULL); |
1da177e4 LT |
1322 | cdev->private->state = DEV_STATE_NOT_OPER; |
1323 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c CH |
1324 | ccw_device_unregister(cdev); |
1325 | put_device(&cdev->dev); | |
cd6b4f27 | 1326 | kfree(sch->private); |
7e9db9ea | 1327 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1328 | return 0; |
1329 | } | |
1330 | ||
602b20f2 | 1331 | static int io_subchannel_notify(struct subchannel *sch, int event) |
1da177e4 LT |
1332 | { |
1333 | struct ccw_device *cdev; | |
1334 | ||
db6a6423 | 1335 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1336 | if (!cdev) |
1337 | return 0; | |
c820de39 | 1338 | return ccw_device_notify(cdev, event); |
1da177e4 LT |
1339 | } |
1340 | ||
602b20f2 | 1341 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1342 | { |
1343 | struct ccw_device *cdev; | |
1344 | ||
db6a6423 | 1345 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1346 | if (cdev) |
1347 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1348 | } | |
1349 | ||
c820de39 | 1350 | static int check_for_io_on_path(struct subchannel *sch, int mask) |
1da177e4 | 1351 | { |
cdb912a4 | 1352 | if (cio_update_schib(sch)) |
c820de39 | 1353 | return 0; |
23d805b6 | 1354 | if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask) |
c820de39 CH |
1355 | return 1; |
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | static void terminate_internal_io(struct subchannel *sch, | |
1360 | struct ccw_device *cdev) | |
1361 | { | |
1362 | if (cio_clear(sch)) { | |
1363 | /* Recheck device in case clear failed. */ | |
1364 | sch->lpm = 0; | |
1365 | if (cdev->online) | |
1366 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1367 | else | |
1368 | css_schedule_eval(sch->schid); | |
d23861ff | 1369 | return; |
c820de39 | 1370 | } |
1da177e4 | 1371 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
c820de39 CH |
1372 | /* Request retry of internal operation. */ |
1373 | cdev->private->flags.intretry = 1; | |
1374 | /* Call handler. */ | |
1da177e4 LT |
1375 | if (cdev->handler) |
1376 | cdev->handler(cdev, cdev->private->intparm, | |
1377 | ERR_PTR(-EIO)); | |
1378 | } | |
1379 | ||
c820de39 CH |
1380 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1381 | { | |
1382 | struct ccw_device *cdev; | |
1383 | ||
1384 | cdev = sch_get_cdev(sch); | |
1385 | if (!cdev) | |
1386 | return; | |
1387 | if (check_for_io_on_path(sch, mask)) { | |
1388 | if (cdev->private->state == DEV_STATE_ONLINE) | |
1389 | ccw_device_kill_io(cdev); | |
1390 | else { | |
1391 | terminate_internal_io(sch, cdev); | |
1392 | /* Re-start path verification. */ | |
1393 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1394 | } | |
1395 | } else | |
1396 | /* trigger path verification. */ | |
1397 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1398 | ||
1399 | } | |
1400 | ||
99611f87 CH |
1401 | static int io_subchannel_chp_event(struct subchannel *sch, |
1402 | struct chp_link *link, int event) | |
c820de39 CH |
1403 | { |
1404 | int mask; | |
c820de39 | 1405 | |
99611f87 | 1406 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1407 | if (!mask) |
1408 | return 0; | |
1409 | switch (event) { | |
1410 | case CHP_VARY_OFF: | |
1411 | sch->opm &= ~mask; | |
1412 | sch->lpm &= ~mask; | |
1413 | io_subchannel_terminate_path(sch, mask); | |
1414 | break; | |
1415 | case CHP_VARY_ON: | |
1416 | sch->opm |= mask; | |
1417 | sch->lpm |= mask; | |
1418 | io_subchannel_verify(sch); | |
1419 | break; | |
1420 | case CHP_OFFLINE: | |
cdb912a4 | 1421 | if (cio_update_schib(sch)) |
c820de39 CH |
1422 | return -ENODEV; |
1423 | io_subchannel_terminate_path(sch, mask); | |
1424 | break; | |
1425 | case CHP_ONLINE: | |
cdb912a4 SO |
1426 | if (cio_update_schib(sch)) |
1427 | return -ENODEV; | |
c820de39 CH |
1428 | sch->lpm |= mask & sch->opm; |
1429 | io_subchannel_verify(sch); | |
1430 | break; | |
1431 | } | |
1432 | return 0; | |
1433 | } | |
1434 | ||
1da177e4 | 1435 | static void |
8bbace7e | 1436 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1437 | { |
1da177e4 LT |
1438 | struct ccw_device *cdev; |
1439 | int ret; | |
1440 | ||
db6a6423 | 1441 | cdev = sch_get_cdev(sch); |
1da177e4 | 1442 | |
a8237fc4 | 1443 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1444 | return; |
1445 | if (!sch->schib.pmcw.ena) | |
1446 | /* Nothing to do. */ | |
1447 | return; | |
1448 | ret = cio_disable_subchannel(sch); | |
1449 | if (ret != -EBUSY) | |
1450 | /* Subchannel is disabled, we're done. */ | |
1451 | return; | |
1452 | cdev->private->state = DEV_STATE_QUIESCE; | |
1453 | if (cdev->handler) | |
1454 | cdev->handler(cdev, cdev->private->intparm, | |
1455 | ERR_PTR(-EIO)); | |
1456 | ret = ccw_device_cancel_halt_clear(cdev); | |
1457 | if (ret == -EBUSY) { | |
1458 | ccw_device_set_timeout(cdev, HZ/10); | |
1459 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1460 | } | |
1461 | cio_disable_subchannel(sch); | |
1462 | } | |
1463 | ||
c820de39 CH |
1464 | static int io_subchannel_get_status(struct subchannel *sch) |
1465 | { | |
1466 | struct schib schib; | |
1467 | ||
1468 | if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) | |
1469 | return CIO_GONE; | |
1470 | if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) | |
1471 | return CIO_REVALIDATE; | |
1472 | if (!sch->lpm) | |
1473 | return CIO_NO_PATH; | |
1474 | return CIO_OPER; | |
1475 | } | |
1476 | ||
1477 | static int device_is_disconnected(struct ccw_device *cdev) | |
1478 | { | |
1479 | if (!cdev) | |
1480 | return 0; | |
1481 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1482 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1483 | } | |
1484 | ||
1485 | static int recovery_check(struct device *dev, void *data) | |
1486 | { | |
1487 | struct ccw_device *cdev = to_ccwdev(dev); | |
1488 | int *redo = data; | |
1489 | ||
1490 | spin_lock_irq(cdev->ccwlock); | |
1491 | switch (cdev->private->state) { | |
1492 | case DEV_STATE_DISCONNECTED: | |
1493 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1494 | cdev->private->dev_id.ssid, | |
1495 | cdev->private->dev_id.devno); | |
1496 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1497 | *redo = 1; | |
1498 | break; | |
1499 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1500 | *redo = 1; | |
1501 | break; | |
1502 | } | |
1503 | spin_unlock_irq(cdev->ccwlock); | |
1504 | ||
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | static void recovery_work_func(struct work_struct *unused) | |
1509 | { | |
1510 | int redo = 0; | |
1511 | ||
1512 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1513 | if (redo) { | |
1514 | spin_lock_irq(&recovery_lock); | |
1515 | if (!timer_pending(&recovery_timer)) { | |
1516 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1517 | recovery_phase++; | |
1518 | mod_timer(&recovery_timer, jiffies + | |
1519 | recovery_delay[recovery_phase] * HZ); | |
1520 | } | |
1521 | spin_unlock_irq(&recovery_lock); | |
1522 | } else | |
1523 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1524 | } | |
1525 | ||
1526 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1527 | ||
1528 | static void recovery_func(unsigned long data) | |
1529 | { | |
1530 | /* | |
1531 | * We can't do our recovery in softirq context and it's not | |
1532 | * performance critical, so we schedule it. | |
1533 | */ | |
1534 | schedule_work(&recovery_work); | |
1535 | } | |
1536 | ||
1537 | static void ccw_device_schedule_recovery(void) | |
1538 | { | |
1539 | unsigned long flags; | |
1540 | ||
1541 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1542 | spin_lock_irqsave(&recovery_lock, flags); | |
1543 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1544 | recovery_phase = 0; | |
1545 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1546 | } | |
1547 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1548 | } | |
1549 | ||
ecf5d9ef PO |
1550 | static int purge_fn(struct device *dev, void *data) |
1551 | { | |
1552 | struct ccw_device *cdev = to_ccwdev(dev); | |
1553 | struct ccw_device_private *priv = cdev->private; | |
1554 | int unreg; | |
1555 | ||
1556 | spin_lock_irq(cdev->ccwlock); | |
1557 | unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) && | |
1558 | (priv->state == DEV_STATE_OFFLINE); | |
1559 | spin_unlock_irq(cdev->ccwlock); | |
1560 | if (!unreg) | |
1561 | goto out; | |
1562 | if (!get_device(&cdev->dev)) | |
1563 | goto out; | |
1564 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid, | |
1565 | priv->dev_id.devno); | |
c4621a62 | 1566 | ccw_device_schedule_sch_unregister(cdev); |
ecf5d9ef PO |
1567 | |
1568 | out: | |
1569 | /* Abort loop in case of pending signal. */ | |
1570 | if (signal_pending(current)) | |
1571 | return -EINTR; | |
1572 | ||
1573 | return 0; | |
1574 | } | |
1575 | ||
1576 | /** | |
1577 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1578 | * | |
1579 | * Unregister all ccw devices that are offline and on the blacklist. | |
1580 | */ | |
1581 | int ccw_purge_blacklisted(void) | |
1582 | { | |
1583 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1584 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1585 | return 0; | |
1586 | } | |
1587 | ||
c820de39 CH |
1588 | static void device_set_disconnected(struct ccw_device *cdev) |
1589 | { | |
1590 | if (!cdev) | |
1591 | return; | |
1592 | ccw_device_set_timeout(cdev, 0); | |
1593 | cdev->private->flags.fake_irb = 0; | |
1594 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1595 | if (cdev->online) | |
1596 | ccw_device_schedule_recovery(); | |
1597 | } | |
1598 | ||
91c36919 PO |
1599 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1600 | { | |
1601 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1602 | ||
1603 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1604 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1605 | ccw_device_set_timeout(cdev, 0); |
1606 | cio_disable_subchannel(sch); | |
1607 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1608 | } | |
1609 | ||
c820de39 CH |
1610 | static int io_subchannel_sch_event(struct subchannel *sch, int slow) |
1611 | { | |
1612 | int event, ret, disc; | |
1613 | unsigned long flags; | |
91c36919 | 1614 | enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE, DISC } action; |
c820de39 CH |
1615 | struct ccw_device *cdev; |
1616 | ||
1617 | spin_lock_irqsave(sch->lock, flags); | |
1618 | cdev = sch_get_cdev(sch); | |
1619 | disc = device_is_disconnected(cdev); | |
1620 | if (disc && slow) { | |
1621 | /* Disconnected devices are evaluated directly only.*/ | |
1622 | spin_unlock_irqrestore(sch->lock, flags); | |
1623 | return 0; | |
1624 | } | |
1625 | /* No interrupt after machine check - kill pending timers. */ | |
1626 | if (cdev) | |
1627 | ccw_device_set_timeout(cdev, 0); | |
1628 | if (!disc && !slow) { | |
1629 | /* Non-disconnected devices are evaluated on the slow path. */ | |
1630 | spin_unlock_irqrestore(sch->lock, flags); | |
1631 | return -EAGAIN; | |
1632 | } | |
1633 | event = io_subchannel_get_status(sch); | |
1634 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", | |
1635 | sch->schid.ssid, sch->schid.sch_no, event, | |
1636 | disc ? "disconnected" : "normal", | |
1637 | slow ? "slow" : "fast"); | |
1638 | /* Analyze subchannel status. */ | |
1639 | action = NONE; | |
1640 | switch (event) { | |
1641 | case CIO_NO_PATH: | |
1642 | if (disc) { | |
1643 | /* Check if paths have become available. */ | |
1644 | action = REPROBE; | |
1645 | break; | |
1646 | } | |
1647 | /* fall through */ | |
1648 | case CIO_GONE: | |
c820de39 | 1649 | /* Ask driver what to do with device. */ |
91c36919 PO |
1650 | if (io_subchannel_notify(sch, event)) |
1651 | action = DISC; | |
1652 | else | |
1653 | action = UNREGISTER; | |
c820de39 CH |
1654 | break; |
1655 | case CIO_REVALIDATE: | |
1656 | /* Device will be removed, so no notify necessary. */ | |
1657 | if (disc) | |
1658 | /* Reprobe because immediate unregister might block. */ | |
1659 | action = REPROBE; | |
1660 | else | |
1661 | action = UNREGISTER_PROBE; | |
1662 | break; | |
1663 | case CIO_OPER: | |
1664 | if (disc) | |
1665 | /* Get device operational again. */ | |
1666 | action = REPROBE; | |
1667 | break; | |
1668 | } | |
1669 | /* Perform action. */ | |
1670 | ret = 0; | |
1671 | switch (action) { | |
1672 | case UNREGISTER: | |
1673 | case UNREGISTER_PROBE: | |
91c36919 | 1674 | ccw_device_set_notoper(cdev); |
c820de39 CH |
1675 | /* Unregister device (will use subchannel lock). */ |
1676 | spin_unlock_irqrestore(sch->lock, flags); | |
1677 | css_sch_device_unregister(sch); | |
1678 | spin_lock_irqsave(sch->lock, flags); | |
1679 | ||
1680 | /* Reset intparm to zeroes. */ | |
13952ec1 SO |
1681 | sch->config.intparm = 0; |
1682 | cio_commit_config(sch); | |
c820de39 CH |
1683 | break; |
1684 | case REPROBE: | |
1685 | ccw_device_trigger_reprobe(cdev); | |
1686 | break; | |
91c36919 PO |
1687 | case DISC: |
1688 | device_set_disconnected(cdev); | |
1689 | break; | |
c820de39 CH |
1690 | default: |
1691 | break; | |
1692 | } | |
1693 | spin_unlock_irqrestore(sch->lock, flags); | |
1694 | /* Probe if necessary. */ | |
1695 | if (action == UNREGISTER_PROBE) | |
1696 | ret = css_probe_device(sch->schid); | |
1697 | ||
1698 | return ret; | |
1699 | } | |
1700 | ||
1da177e4 LT |
1701 | #ifdef CONFIG_CCW_CONSOLE |
1702 | static struct ccw_device console_cdev; | |
1f4e7eda | 1703 | static char console_cdev_name[10] = "0.x.xxxx"; |
1da177e4 LT |
1704 | static struct ccw_device_private console_private; |
1705 | static int console_cdev_in_use; | |
1706 | ||
2ec22984 CH |
1707 | static DEFINE_SPINLOCK(ccw_console_lock); |
1708 | ||
1709 | spinlock_t * cio_get_console_lock(void) | |
1710 | { | |
1711 | return &ccw_console_lock; | |
1712 | } | |
1713 | ||
0ae7a7b2 CH |
1714 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1715 | struct subchannel *sch) | |
1da177e4 LT |
1716 | { |
1717 | int rc; | |
1718 | ||
cd6b4f27 CH |
1719 | /* Attach subchannel private data. */ |
1720 | sch->private = cio_get_console_priv(); | |
1721 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 | 1722 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1723 | rc = cio_commit_config(sch); |
1724 | if (rc) | |
1725 | return rc; | |
0ae7a7b2 | 1726 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1727 | /* Initialize the ccw_device structure. */ |
292888c8 | 1728 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1729 | rc = io_subchannel_recog(cdev, sch); |
1730 | if (rc) | |
1731 | return rc; | |
1732 | ||
1733 | /* Now wait for the async. recognition to come to an end. */ | |
1734 | spin_lock_irq(cdev->ccwlock); | |
1735 | while (!dev_fsm_final_state(cdev)) | |
1736 | wait_cons_dev(); | |
1737 | rc = -EIO; | |
1738 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1739 | goto out_unlock; | |
1740 | ccw_device_online(cdev); | |
1741 | while (!dev_fsm_final_state(cdev)) | |
1742 | wait_cons_dev(); | |
1743 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1744 | goto out_unlock; | |
1745 | rc = 0; | |
1746 | out_unlock: | |
1747 | spin_unlock_irq(cdev->ccwlock); | |
1748 | return 0; | |
1749 | } | |
1750 | ||
1751 | struct ccw_device * | |
1752 | ccw_device_probe_console(void) | |
1753 | { | |
1754 | struct subchannel *sch; | |
1755 | int ret; | |
1756 | ||
1757 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1758 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1759 | sch = cio_probe_console(); |
1760 | if (IS_ERR(sch)) { | |
1761 | console_cdev_in_use = 0; | |
1762 | return (void *) sch; | |
1763 | } | |
1764 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1765 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1766 | console_cdev.private = &console_private; | |
c1637532 | 1767 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1768 | ret = ccw_device_console_enable(&console_cdev, sch); |
1769 | if (ret) { | |
1770 | cio_release_console(); | |
1771 | console_cdev_in_use = 0; | |
1772 | return ERR_PTR(ret); | |
1773 | } | |
1774 | console_cdev.online = 1; | |
1775 | return &console_cdev; | |
1776 | } | |
1f4e7eda CH |
1777 | |
1778 | ||
1779 | const char *cio_get_console_cdev_name(struct subchannel *sch) | |
1780 | { | |
1781 | snprintf(console_cdev_name, 10, "0.%x.%04x", | |
1782 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1783 | return (const char *)console_cdev_name; | |
1784 | } | |
1da177e4 LT |
1785 | #endif |
1786 | ||
1787 | /* | |
1788 | * get ccw_device matching the busid, but only if owned by cdrv | |
1789 | */ | |
b0744bd2 CH |
1790 | static int |
1791 | __ccwdev_check_busid(struct device *dev, void *id) | |
1792 | { | |
1793 | char *bus_id; | |
1794 | ||
12975aef | 1795 | bus_id = id; |
b0744bd2 | 1796 | |
98df67b3 | 1797 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1798 | } |
1799 | ||
1800 | ||
b2ffd8e9 CH |
1801 | /** |
1802 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1803 | * @cdrv: driver the device is owned by | |
1804 | * @bus_id: bus id of the device to be searched | |
1805 | * | |
1806 | * This function searches all devices owned by @cdrv for a device with a bus | |
1807 | * id matching @bus_id. | |
1808 | * Returns: | |
1809 | * If a match is found, its reference count of the found device is increased | |
1810 | * and it is returned; else %NULL is returned. | |
1811 | */ | |
1812 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1813 | const char *bus_id) | |
1da177e4 | 1814 | { |
b0744bd2 | 1815 | struct device *dev; |
1da177e4 LT |
1816 | struct device_driver *drv; |
1817 | ||
1818 | drv = get_driver(&cdrv->driver); | |
1819 | if (!drv) | |
b0744bd2 | 1820 | return NULL; |
1da177e4 | 1821 | |
b0744bd2 CH |
1822 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1823 | __ccwdev_check_busid); | |
1da177e4 LT |
1824 | put_driver(drv); |
1825 | ||
d2c993d8 | 1826 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1827 | } |
1828 | ||
1829 | /************************** device driver handling ************************/ | |
1830 | ||
1831 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1832 | * and release methods are initially very similar to the device_driver | |
1833 | * implementations, with the difference that they have ccw_device | |
1834 | * arguments. | |
1835 | * | |
1836 | * A ccw driver also contains the information that is needed for | |
1837 | * device matching. | |
1838 | */ | |
1839 | static int | |
1840 | ccw_device_probe (struct device *dev) | |
1841 | { | |
1842 | struct ccw_device *cdev = to_ccwdev(dev); | |
1843 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1844 | int ret; | |
1845 | ||
1846 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1847 | ||
1848 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1849 | ||
1850 | if (ret) { | |
d2c993d8 | 1851 | cdev->drv = NULL; |
1da177e4 LT |
1852 | return ret; |
1853 | } | |
1854 | ||
1855 | return 0; | |
1856 | } | |
1857 | ||
1858 | static int | |
1859 | ccw_device_remove (struct device *dev) | |
1860 | { | |
1861 | struct ccw_device *cdev = to_ccwdev(dev); | |
1862 | struct ccw_driver *cdrv = cdev->drv; | |
1863 | int ret; | |
1864 | ||
1da177e4 LT |
1865 | if (cdrv->remove) |
1866 | cdrv->remove(cdev); | |
1867 | if (cdev->online) { | |
1868 | cdev->online = 0; | |
1869 | spin_lock_irq(cdev->ccwlock); | |
1870 | ret = ccw_device_offline(cdev); | |
1871 | spin_unlock_irq(cdev->ccwlock); | |
1872 | if (ret == 0) | |
1873 | wait_event(cdev->private->wait_q, | |
1874 | dev_fsm_final_state(cdev)); | |
1875 | else | |
139b83dd | 1876 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1877 | "device 0.%x.%04x\n", |
1878 | ret, cdev->private->dev_id.ssid, | |
1879 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1880 | /* Give up reference obtained in ccw_device_set_online(). */ |
1881 | put_device(&cdev->dev); | |
1da177e4 LT |
1882 | } |
1883 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1884 | cdev->drv = NULL; |
1da177e4 LT |
1885 | return 0; |
1886 | } | |
1887 | ||
958974fb CH |
1888 | static void ccw_device_shutdown(struct device *dev) |
1889 | { | |
1890 | struct ccw_device *cdev; | |
1891 | ||
1892 | cdev = to_ccwdev(dev); | |
1893 | if (cdev->drv && cdev->drv->shutdown) | |
1894 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1895 | disable_cmf(cdev); |
958974fb CH |
1896 | } |
1897 | ||
8bbace7e CH |
1898 | struct bus_type ccw_bus_type = { |
1899 | .name = "ccw", | |
1900 | .match = ccw_bus_match, | |
1901 | .uevent = ccw_uevent, | |
1902 | .probe = ccw_device_probe, | |
1903 | .remove = ccw_device_remove, | |
958974fb | 1904 | .shutdown = ccw_device_shutdown, |
8bbace7e CH |
1905 | }; |
1906 | ||
b2ffd8e9 CH |
1907 | /** |
1908 | * ccw_driver_register() - register a ccw driver | |
1909 | * @cdriver: driver to be registered | |
1910 | * | |
1911 | * This function is mainly a wrapper around driver_register(). | |
1912 | * Returns: | |
1913 | * %0 on success and a negative error value on failure. | |
1914 | */ | |
1915 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1916 | { |
1917 | struct device_driver *drv = &cdriver->driver; | |
1918 | ||
1919 | drv->bus = &ccw_bus_type; | |
1920 | drv->name = cdriver->name; | |
4beee646 | 1921 | drv->owner = cdriver->owner; |
1da177e4 LT |
1922 | |
1923 | return driver_register(drv); | |
1924 | } | |
1925 | ||
b2ffd8e9 CH |
1926 | /** |
1927 | * ccw_driver_unregister() - deregister a ccw driver | |
1928 | * @cdriver: driver to be deregistered | |
1929 | * | |
1930 | * This function is mainly a wrapper around driver_unregister(). | |
1931 | */ | |
1932 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1933 | { |
1934 | driver_unregister(&cdriver->driver); | |
1935 | } | |
1936 | ||
a8237fc4 CH |
1937 | /* Helper func for qdio. */ |
1938 | struct subchannel_id | |
1939 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1940 | { | |
1941 | struct subchannel *sch; | |
1942 | ||
1943 | sch = to_subchannel(cdev->dev.parent); | |
1944 | return sch->schid; | |
1945 | } | |
1946 | ||
1da177e4 LT |
1947 | MODULE_LICENSE("GPL"); |
1948 | EXPORT_SYMBOL(ccw_device_set_online); | |
1949 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1950 | EXPORT_SYMBOL(ccw_driver_register); | |
1951 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1952 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1953 | EXPORT_SYMBOL(ccw_bus_type); | |
1954 | EXPORT_SYMBOL(ccw_device_work); | |
a8237fc4 | 1955 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |