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Commit | Line | Data |
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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 | ||
2f17644d | 173 | int __init io_subchannel_init(void) |
1da177e4 LT |
174 | { |
175 | int ret; | |
176 | ||
177 | init_waitqueue_head(&ccw_device_init_wq); | |
178 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 179 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 LT |
180 | |
181 | ccw_device_work = create_singlethread_workqueue("cio"); | |
182 | if (!ccw_device_work) | |
2f17644d | 183 | return -ENOMEM; |
1da177e4 LT |
184 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); |
185 | if (!slow_path_wq) { | |
2f17644d | 186 | ret = -ENOMEM; |
1da177e4 LT |
187 | goto out_err; |
188 | } | |
189 | if ((ret = bus_register (&ccw_bus_type))) | |
190 | goto out_err; | |
191 | ||
25b7bb58 CH |
192 | ret = css_driver_register(&io_subchannel_driver); |
193 | if (ret) | |
1da177e4 LT |
194 | goto out_err; |
195 | ||
1da177e4 LT |
196 | return 0; |
197 | out_err: | |
198 | if (ccw_device_work) | |
199 | destroy_workqueue(ccw_device_work); | |
1da177e4 LT |
200 | if (slow_path_wq) |
201 | destroy_workqueue(slow_path_wq); | |
202 | return ret; | |
203 | } | |
204 | ||
1da177e4 LT |
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 | { |
3b554a14 | 296 | if (test_and_clear_bit(1, &cdev->private->registered)) { |
ef99516c | 297 | device_del(&cdev->dev); |
3b554a14 SO |
298 | /* Release reference from device_initialize(). */ |
299 | put_device(&cdev->dev); | |
300 | } | |
7674da77 CH |
301 | } |
302 | ||
46fbe4e4 | 303 | static void ccw_device_remove_orphan_cb(struct work_struct *work) |
59a8a6e2 | 304 | { |
46fbe4e4 PO |
305 | struct ccw_device_private *priv; |
306 | struct ccw_device *cdev; | |
59a8a6e2 | 307 | |
46fbe4e4 PO |
308 | priv = container_of(work, struct ccw_device_private, kick_work); |
309 | cdev = priv->cdev; | |
59a8a6e2 | 310 | ccw_device_unregister(cdev); |
46fbe4e4 PO |
311 | /* Release cdev reference for workqueue processing. */ |
312 | put_device(&cdev->dev); | |
59a8a6e2 CH |
313 | } |
314 | ||
1da177e4 LT |
315 | static void |
316 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
317 | { | |
d7b5a4c9 | 318 | unsigned long flags; |
59a8a6e2 | 319 | |
1da177e4 LT |
320 | /* |
321 | * Forced offline in disconnected state means | |
322 | * 'throw away device'. | |
323 | */ | |
d7b5a4c9 | 324 | if (ccw_device_is_orphan(cdev)) { |
59a8a6e2 CH |
325 | /* |
326 | * Deregister ccw device. | |
327 | * Unfortunately, we cannot do this directly from the | |
328 | * attribute method. | |
329 | */ | |
be7a2ddc SO |
330 | /* Get cdev reference for workqueue processing. */ |
331 | if (!get_device(&cdev->dev)) | |
332 | return; | |
d7b5a4c9 CH |
333 | spin_lock_irqsave(cdev->ccwlock, flags); |
334 | cdev->private->state = DEV_STATE_NOT_OPER; | |
335 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
46fbe4e4 PO |
336 | PREPARE_WORK(&cdev->private->kick_work, |
337 | ccw_device_remove_orphan_cb); | |
c4621a62 | 338 | queue_work(slow_path_wq, &cdev->private->kick_work); |
46fbe4e4 PO |
339 | } else |
340 | /* Deregister subchannel, which will kill the ccw device. */ | |
c4621a62 | 341 | ccw_device_schedule_sch_unregister(cdev); |
1da177e4 LT |
342 | } |
343 | ||
b2ffd8e9 CH |
344 | /** |
345 | * ccw_device_set_offline() - disable a ccw device for I/O | |
346 | * @cdev: target ccw device | |
347 | * | |
348 | * This function calls the driver's set_offline() function for @cdev, if | |
349 | * given, and then disables @cdev. | |
350 | * Returns: | |
351 | * %0 on success and a negative error value on failure. | |
352 | * Context: | |
353 | * enabled, ccw device lock not held | |
354 | */ | |
355 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 LT |
356 | { |
357 | int ret; | |
358 | ||
359 | if (!cdev) | |
360 | return -ENODEV; | |
361 | if (!cdev->online || !cdev->drv) | |
362 | return -EINVAL; | |
363 | ||
364 | if (cdev->drv->set_offline) { | |
365 | ret = cdev->drv->set_offline(cdev); | |
366 | if (ret != 0) | |
367 | return ret; | |
368 | } | |
369 | cdev->online = 0; | |
370 | spin_lock_irq(cdev->ccwlock); | |
217ee6c6 ME |
371 | /* Wait until a final state or DISCONNECTED is reached */ |
372 | while (!dev_fsm_final_state(cdev) && | |
373 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 374 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
375 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
376 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
377 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 378 | } |
217ee6c6 ME |
379 | ret = ccw_device_offline(cdev); |
380 | if (ret) | |
381 | goto error; | |
1da177e4 | 382 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
383 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
384 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
385 | /* Give up reference from ccw_device_set_online(). */ | |
386 | put_device(&cdev->dev); | |
387 | return 0; | |
388 | ||
389 | error: | |
390 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n", | |
391 | ret, cdev->private->dev_id.ssid, | |
392 | cdev->private->dev_id.devno); | |
393 | cdev->private->state = DEV_STATE_OFFLINE; | |
394 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
395 | spin_unlock_irq(cdev->ccwlock); | |
396 | /* Give up reference from ccw_device_set_online(). */ | |
397 | put_device(&cdev->dev); | |
398 | return -ENODEV; | |
1da177e4 LT |
399 | } |
400 | ||
b2ffd8e9 CH |
401 | /** |
402 | * ccw_device_set_online() - enable a ccw device for I/O | |
403 | * @cdev: target ccw device | |
404 | * | |
405 | * This function first enables @cdev and then calls the driver's set_online() | |
406 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
407 | * disabled again. | |
408 | * Returns: | |
409 | * %0 on success and a negative error value on failure. | |
410 | * Context: | |
411 | * enabled, ccw device lock not held | |
412 | */ | |
413 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
414 | { |
415 | int ret; | |
217ee6c6 | 416 | int ret2; |
1da177e4 LT |
417 | |
418 | if (!cdev) | |
419 | return -ENODEV; | |
420 | if (cdev->online || !cdev->drv) | |
421 | return -EINVAL; | |
9cd67421 CH |
422 | /* Hold on to an extra reference while device is online. */ |
423 | if (!get_device(&cdev->dev)) | |
424 | return -ENODEV; | |
1da177e4 LT |
425 | |
426 | spin_lock_irq(cdev->ccwlock); | |
427 | ret = ccw_device_online(cdev); | |
428 | spin_unlock_irq(cdev->ccwlock); | |
429 | if (ret == 0) | |
430 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
431 | else { | |
139b83dd | 432 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
433 | "device 0.%x.%04x\n", |
434 | ret, cdev->private->dev_id.ssid, | |
435 | cdev->private->dev_id.devno); | |
9cd67421 CH |
436 | /* Give up online reference since onlining failed. */ |
437 | put_device(&cdev->dev); | |
1da177e4 LT |
438 | return ret; |
439 | } | |
217ee6c6 ME |
440 | spin_lock_irq(cdev->ccwlock); |
441 | /* Check if online processing was successful */ | |
442 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
443 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
444 | spin_unlock_irq(cdev->ccwlock); | |
9cd67421 CH |
445 | /* Give up online reference since onlining failed. */ |
446 | put_device(&cdev->dev); | |
1da177e4 | 447 | return -ENODEV; |
9cd67421 | 448 | } |
217ee6c6 ME |
449 | spin_unlock_irq(cdev->ccwlock); |
450 | if (cdev->drv->set_online) | |
451 | ret = cdev->drv->set_online(cdev); | |
452 | if (ret) | |
453 | goto rollback; | |
454 | cdev->online = 1; | |
455 | return 0; | |
456 | ||
457 | rollback: | |
1da177e4 | 458 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
459 | /* Wait until a final state or DISCONNECTED is reached */ |
460 | while (!dev_fsm_final_state(cdev) && | |
461 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
462 | spin_unlock_irq(cdev->ccwlock); | |
463 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
464 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
465 | spin_lock_irq(cdev->ccwlock); | |
466 | } | |
467 | ret2 = ccw_device_offline(cdev); | |
468 | if (ret2) | |
469 | goto error; | |
470 | spin_unlock_irq(cdev->ccwlock); | |
471 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
472 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
473 | /* Give up online reference since onlining failed. */ | |
474 | put_device(&cdev->dev); | |
475 | return ret; | |
476 | ||
477 | error: | |
478 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
479 | "device 0.%x.%04x\n", | |
480 | ret2, cdev->private->dev_id.ssid, | |
481 | cdev->private->dev_id.devno); | |
482 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 483 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
484 | /* Give up online reference since onlining failed. */ |
485 | put_device(&cdev->dev); | |
217ee6c6 | 486 | return ret; |
1da177e4 LT |
487 | } |
488 | ||
e74fe0ce | 489 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 CH |
490 | { |
491 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
492 | ccw_device_remove_disconnected(cdev); | |
e74fe0ce SO |
493 | else if (cdev->online && cdev->drv && cdev->drv->set_offline) |
494 | return ccw_device_set_offline(cdev); | |
495 | return 0; | |
f5ba6c86 CH |
496 | } |
497 | ||
498 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
499 | { | |
500 | int ret; | |
501 | ||
502 | /* Do device recognition, if needed. */ | |
99f6a570 | 503 | if (cdev->private->state == DEV_STATE_BOXED) { |
f5ba6c86 CH |
504 | ret = ccw_device_recognition(cdev); |
505 | if (ret) { | |
e556bbbd CH |
506 | CIO_MSG_EVENT(0, "Couldn't start recognition " |
507 | "for device 0.%x.%04x (ret=%d)\n", | |
508 | cdev->private->dev_id.ssid, | |
509 | cdev->private->dev_id.devno, ret); | |
f5ba6c86 CH |
510 | return ret; |
511 | } | |
512 | wait_event(cdev->private->wait_q, | |
513 | cdev->private->flags.recog_done); | |
156013ff SO |
514 | if (cdev->private->state != DEV_STATE_OFFLINE) |
515 | /* recognition failed */ | |
516 | return -EAGAIN; | |
f5ba6c86 CH |
517 | } |
518 | if (cdev->drv && cdev->drv->set_online) | |
519 | ccw_device_set_online(cdev); | |
520 | return 0; | |
521 | } | |
156013ff | 522 | |
c78aa6cb | 523 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
524 | { |
525 | int ret; | |
526 | ||
527 | ret = online_store_recog_and_online(cdev); | |
156013ff | 528 | if (ret && !force) |
c78aa6cb | 529 | return ret; |
f5ba6c86 CH |
530 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
531 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
532 | if (ret) |
533 | return ret; | |
f5ba6c86 CH |
534 | if (cdev->id.cu_type == 0) |
535 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
536 | ret = online_store_recog_and_online(cdev); |
537 | if (ret) | |
538 | return ret; | |
f5ba6c86 | 539 | } |
c78aa6cb | 540 | return 0; |
f5ba6c86 CH |
541 | } |
542 | ||
543 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
544 | const char *buf, size_t count) | |
1da177e4 LT |
545 | { |
546 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
547 | int force, ret; |
548 | unsigned long i; | |
1da177e4 | 549 | |
b5cd99e6 SO |
550 | if ((cdev->private->state != DEV_STATE_OFFLINE && |
551 | cdev->private->state != DEV_STATE_ONLINE && | |
552 | cdev->private->state != DEV_STATE_BOXED && | |
553 | cdev->private->state != DEV_STATE_DISCONNECTED) || | |
554 | atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) | |
1da177e4 LT |
555 | return -EAGAIN; |
556 | ||
557 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
558 | atomic_set(&cdev->private->onoff, 0); | |
559 | return -EINVAL; | |
560 | } | |
561 | if (!strncmp(buf, "force\n", count)) { | |
562 | force = 1; | |
563 | i = 1; | |
2f972202 | 564 | ret = 0; |
1da177e4 LT |
565 | } else { |
566 | force = 0; | |
2f972202 | 567 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 568 | } |
2f972202 CH |
569 | if (ret) |
570 | goto out; | |
f5ba6c86 CH |
571 | switch (i) { |
572 | case 0: | |
e74fe0ce | 573 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
574 | break; |
575 | case 1: | |
c78aa6cb | 576 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
577 | break; |
578 | default: | |
2f972202 | 579 | ret = -EINVAL; |
1da177e4 | 580 | } |
2f972202 | 581 | out: |
1da177e4 LT |
582 | if (cdev->drv) |
583 | module_put(cdev->drv->owner); | |
584 | atomic_set(&cdev->private->onoff, 0); | |
e74fe0ce | 585 | return (ret < 0) ? ret : count; |
1da177e4 LT |
586 | } |
587 | ||
588 | static ssize_t | |
3fd3c0a5 | 589 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
590 | { |
591 | struct ccw_device *cdev = to_ccwdev(dev); | |
592 | struct subchannel *sch; | |
593 | ||
d7b5a4c9 CH |
594 | if (ccw_device_is_orphan(cdev)) |
595 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
596 | switch (cdev->private->state) { |
597 | case DEV_STATE_BOXED: | |
598 | return sprintf(buf, "boxed\n"); | |
599 | case DEV_STATE_DISCONNECTED: | |
600 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
601 | case DEV_STATE_NOT_OPER: | |
602 | sch = to_subchannel(dev->parent); | |
603 | if (!sch->lpm) | |
604 | return sprintf(buf, "no path\n"); | |
605 | else | |
606 | return sprintf(buf, "no device\n"); | |
607 | default: | |
608 | /* All other states considered fine. */ | |
609 | return sprintf(buf, "good\n"); | |
610 | } | |
611 | } | |
612 | ||
613 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
614 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
615 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
616 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 617 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 618 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
619 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
620 | ||
7e9db9ea | 621 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
622 | &dev_attr_chpids.attr, |
623 | &dev_attr_pimpampom.attr, | |
624 | NULL, | |
625 | }; | |
626 | ||
7e9db9ea CH |
627 | static struct attribute_group io_subchannel_attr_group = { |
628 | .attrs = io_subchannel_attrs, | |
529192f3 | 629 | }; |
1da177e4 LT |
630 | |
631 | static struct attribute * ccwdev_attrs[] = { | |
632 | &dev_attr_devtype.attr, | |
633 | &dev_attr_cutype.attr, | |
f1fc78a8 | 634 | &dev_attr_modalias.attr, |
1da177e4 LT |
635 | &dev_attr_online.attr, |
636 | &dev_attr_cmb_enable.attr, | |
637 | &dev_attr_availability.attr, | |
638 | NULL, | |
639 | }; | |
640 | ||
641 | static struct attribute_group ccwdev_attr_group = { | |
642 | .attrs = ccwdev_attrs, | |
643 | }; | |
644 | ||
a4dbd674 | 645 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
646 | &ccwdev_attr_group, |
647 | NULL, | |
648 | }; | |
1da177e4 LT |
649 | |
650 | /* this is a simple abstraction for device_register that sets the | |
651 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 652 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
653 | { |
654 | struct device *dev = &cdev->dev; | |
655 | int ret; | |
656 | ||
657 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
658 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
659 | cdev->private->dev_id.devno); | |
660 | if (ret) | |
661 | return ret; | |
662 | ret = device_add(dev); | |
663 | if (ret) | |
1da177e4 LT |
664 | return ret; |
665 | ||
666 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
667 | return ret; |
668 | } | |
669 | ||
b0744bd2 | 670 | struct match_data { |
78964268 | 671 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
672 | struct ccw_device * sibling; |
673 | }; | |
674 | ||
675 | static int | |
676 | match_devno(struct device * dev, void * data) | |
677 | { | |
78964268 | 678 | struct match_data * d = data; |
b0744bd2 CH |
679 | struct ccw_device * cdev; |
680 | ||
681 | cdev = to_ccwdev(dev); | |
682 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 683 | !ccw_device_is_orphan(cdev) && |
78964268 | 684 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 685 | (cdev != d->sibling)) |
b0744bd2 | 686 | return 1; |
b0744bd2 CH |
687 | return 0; |
688 | } | |
689 | ||
78964268 CH |
690 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
691 | struct ccw_device *sibling) | |
1da177e4 | 692 | { |
1da177e4 | 693 | struct device *dev; |
292888c8 | 694 | struct match_data data; |
1da177e4 | 695 | |
78964268 | 696 | data.dev_id = *dev_id; |
292888c8 | 697 | data.sibling = sibling; |
e5945b4f | 698 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 699 | |
b0744bd2 | 700 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
701 | } |
702 | ||
d7b5a4c9 CH |
703 | static int match_orphan(struct device *dev, void *data) |
704 | { | |
705 | struct ccw_dev_id *dev_id; | |
706 | struct ccw_device *cdev; | |
707 | ||
708 | dev_id = data; | |
709 | cdev = to_ccwdev(dev); | |
710 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
711 | } | |
712 | ||
713 | static struct ccw_device * | |
714 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
715 | struct ccw_dev_id *dev_id) | |
716 | { | |
717 | struct device *dev; | |
718 | ||
719 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
720 | match_orphan); | |
721 | ||
722 | return dev ? to_ccwdev(dev) : NULL; | |
723 | } | |
724 | ||
eb32ae8d | 725 | void ccw_device_do_unbind_bind(struct work_struct *work) |
1da177e4 | 726 | { |
c1637532 | 727 | struct ccw_device_private *priv; |
1da177e4 LT |
728 | struct ccw_device *cdev; |
729 | struct subchannel *sch; | |
eb32ae8d | 730 | int ret; |
1da177e4 | 731 | |
c1637532 MS |
732 | priv = container_of(work, struct ccw_device_private, kick_work); |
733 | cdev = priv->cdev; | |
1da177e4 | 734 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 735 | |
eb32ae8d CH |
736 | if (test_bit(1, &cdev->private->registered)) { |
737 | device_release_driver(&cdev->dev); | |
738 | ret = device_attach(&cdev->dev); | |
739 | WARN_ON(ret == -ENODEV); | |
740 | } | |
1da177e4 LT |
741 | } |
742 | ||
743 | static void | |
744 | ccw_device_release(struct device *dev) | |
745 | { | |
746 | struct ccw_device *cdev; | |
747 | ||
748 | cdev = to_ccwdev(dev); | |
6eff208f CH |
749 | /* Release reference of parent subchannel. */ |
750 | put_device(cdev->dev.parent); | |
1da177e4 LT |
751 | kfree(cdev->private); |
752 | kfree(cdev); | |
753 | } | |
754 | ||
7674da77 CH |
755 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
756 | { | |
757 | struct ccw_device *cdev; | |
758 | ||
759 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
760 | if (cdev) { | |
761 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
762 | GFP_KERNEL | GFP_DMA); | |
763 | if (cdev->private) | |
764 | return cdev; | |
765 | } | |
766 | kfree(cdev); | |
767 | return ERR_PTR(-ENOMEM); | |
768 | } | |
769 | ||
770 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
771 | struct ccw_device *cdev) | |
772 | { | |
773 | cdev->private->cdev = cdev; | |
774 | atomic_set(&cdev->private->onoff, 0); | |
775 | cdev->dev.parent = &sch->dev; | |
776 | cdev->dev.release = ccw_device_release; | |
33583c36 | 777 | INIT_WORK(&cdev->private->kick_work, NULL); |
ef99516c | 778 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
779 | /* Do first half of device_register. */ |
780 | device_initialize(&cdev->dev); | |
781 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
782 | /* Release reference from device_initialize(). */ |
783 | put_device(&cdev->dev); | |
7674da77 CH |
784 | return -ENODEV; |
785 | } | |
786 | return 0; | |
787 | } | |
788 | ||
789 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
790 | { | |
791 | struct ccw_device *cdev; | |
792 | int ret; | |
793 | ||
794 | cdev = io_subchannel_allocate_dev(sch); | |
795 | if (!IS_ERR(cdev)) { | |
796 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 797 | if (ret) |
7674da77 | 798 | cdev = ERR_PTR(ret); |
7674da77 CH |
799 | } |
800 | return cdev; | |
801 | } | |
802 | ||
d7b5a4c9 CH |
803 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
804 | ||
805 | static void sch_attach_device(struct subchannel *sch, | |
806 | struct ccw_device *cdev) | |
807 | { | |
82b7ac05 | 808 | css_update_ssd_info(sch); |
d7b5a4c9 | 809 | spin_lock_irq(sch->lock); |
db6a6423 | 810 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
811 | cdev->private->schid = sch->schid; |
812 | cdev->ccwlock = sch->lock; | |
c820de39 | 813 | ccw_device_trigger_reprobe(cdev); |
d7b5a4c9 CH |
814 | spin_unlock_irq(sch->lock); |
815 | } | |
816 | ||
817 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
818 | struct ccw_device *cdev) | |
819 | { | |
820 | struct subchannel *other_sch; | |
821 | int ret; | |
822 | ||
6eff208f CH |
823 | /* Get reference for new parent. */ |
824 | if (!get_device(&sch->dev)) | |
825 | return; | |
826 | other_sch = to_subchannel(cdev->dev.parent); | |
827 | /* Note: device_move() changes cdev->dev.parent */ | |
ffa6a705 | 828 | ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 | 829 | if (ret) { |
139b83dd | 830 | CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed " |
d7b5a4c9 CH |
831 | "(ret=%d)!\n", cdev->private->dev_id.ssid, |
832 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
833 | /* Put reference for new parent. */ |
834 | put_device(&sch->dev); | |
d7b5a4c9 CH |
835 | return; |
836 | } | |
db6a6423 | 837 | sch_set_cdev(other_sch, NULL); |
d7b5a4c9 CH |
838 | /* No need to keep a subchannel without ccw device around. */ |
839 | css_sch_device_unregister(other_sch); | |
d7b5a4c9 | 840 | sch_attach_device(sch, cdev); |
6eff208f CH |
841 | /* Put reference for old parent. */ |
842 | put_device(&other_sch->dev); | |
d7b5a4c9 CH |
843 | } |
844 | ||
845 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
846 | struct ccw_device *cdev) | |
847 | { | |
848 | int ret; | |
6eff208f | 849 | struct subchannel *pseudo_sch; |
d7b5a4c9 | 850 | |
6eff208f CH |
851 | /* Get reference for new parent. */ |
852 | if (!get_device(&sch->dev)) | |
853 | return; | |
854 | pseudo_sch = to_subchannel(cdev->dev.parent); | |
855 | /* | |
856 | * Try to move the ccw device to its new subchannel. | |
857 | * Note: device_move() changes cdev->dev.parent | |
858 | */ | |
ffa6a705 | 859 | ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
860 | if (ret) { |
861 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
862 | "failed (ret=%d)!\n", | |
863 | cdev->private->dev_id.ssid, | |
864 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
865 | /* Put reference for new parent. */ |
866 | put_device(&sch->dev); | |
d7b5a4c9 CH |
867 | return; |
868 | } | |
869 | sch_attach_device(sch, cdev); | |
6eff208f CH |
870 | /* Put reference on pseudo subchannel. */ |
871 | put_device(&pseudo_sch->dev); | |
d7b5a4c9 CH |
872 | } |
873 | ||
874 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
875 | { | |
876 | struct ccw_device *cdev; | |
877 | ||
878 | /* Need to allocate a new ccw device. */ | |
879 | cdev = io_subchannel_create_ccwdev(sch); | |
880 | if (IS_ERR(cdev)) { | |
881 | /* OK, we did everything we could... */ | |
882 | css_sch_device_unregister(sch); | |
883 | return; | |
884 | } | |
885 | spin_lock_irq(sch->lock); | |
db6a6423 | 886 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
887 | spin_unlock_irq(sch->lock); |
888 | /* Start recognition for the new ccw device. */ | |
889 | if (io_subchannel_recog(cdev, sch)) { | |
890 | spin_lock_irq(sch->lock); | |
db6a6423 | 891 | sch_set_cdev(sch, NULL); |
d7b5a4c9 | 892 | spin_unlock_irq(sch->lock); |
d7b5a4c9 | 893 | css_sch_device_unregister(sch); |
6eff208f CH |
894 | /* Put reference from io_subchannel_create_ccwdev(). */ |
895 | put_device(&sch->dev); | |
896 | /* Give up initial reference. */ | |
897 | put_device(&cdev->dev); | |
d7b5a4c9 CH |
898 | } |
899 | } | |
900 | ||
901 | ||
902 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
903 | { | |
904 | struct ccw_device_private *priv; | |
905 | struct ccw_device *cdev; | |
906 | struct ccw_device *replacing_cdev; | |
907 | struct subchannel *sch; | |
908 | int ret; | |
909 | struct channel_subsystem *css; | |
910 | struct ccw_dev_id dev_id; | |
911 | ||
912 | priv = container_of(work, struct ccw_device_private, kick_work); | |
913 | cdev = priv->cdev; | |
914 | sch = to_subchannel(cdev->dev.parent); | |
915 | css = to_css(sch->dev.parent); | |
916 | dev_id.devno = sch->schib.pmcw.dev; | |
917 | dev_id.ssid = sch->schid.ssid; | |
918 | ||
6eff208f CH |
919 | /* Increase refcount for pseudo subchannel. */ |
920 | get_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 CH |
921 | /* |
922 | * Move the orphaned ccw device to the orphanage so the replacing | |
923 | * ccw device can take its place on the subchannel. | |
6eff208f | 924 | * Note: device_move() changes cdev->dev.parent |
d7b5a4c9 | 925 | */ |
ffa6a705 CH |
926 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev, |
927 | DPM_ORDER_NONE); | |
d7b5a4c9 CH |
928 | if (ret) { |
929 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
930 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
931 | cdev->private->dev_id.devno, ret); | |
6eff208f CH |
932 | /* Decrease refcount for pseudo subchannel again. */ |
933 | put_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 CH |
934 | return; |
935 | } | |
936 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
937 | /* | |
938 | * Search for the replacing ccw device | |
939 | * - among the disconnected devices | |
940 | * - in the orphanage | |
941 | */ | |
942 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
943 | if (replacing_cdev) { | |
944 | sch_attach_disconnected_device(sch, replacing_cdev); | |
85acc407 | 945 | /* Release reference from get_disc_ccwdev_by_dev_id() */ |
97166f52 | 946 | put_device(&replacing_cdev->dev); |
6eff208f CH |
947 | /* Release reference of subchannel from old cdev. */ |
948 | put_device(&sch->dev); | |
d7b5a4c9 CH |
949 | return; |
950 | } | |
951 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
952 | if (replacing_cdev) { | |
953 | sch_attach_orphaned_device(sch, replacing_cdev); | |
85acc407 | 954 | /* Release reference from get_orphaned_ccwdev_by_dev_id() */ |
97166f52 | 955 | put_device(&replacing_cdev->dev); |
6eff208f CH |
956 | /* Release reference of subchannel from old cdev. */ |
957 | put_device(&sch->dev); | |
d7b5a4c9 CH |
958 | return; |
959 | } | |
960 | sch_create_and_recog_new_device(sch); | |
6eff208f CH |
961 | /* Release reference of subchannel from old cdev. */ |
962 | put_device(&sch->dev); | |
d7b5a4c9 CH |
963 | } |
964 | ||
1da177e4 LT |
965 | /* |
966 | * Register recognized device. | |
967 | */ | |
968 | static void | |
c1637532 | 969 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 970 | { |
c1637532 | 971 | struct ccw_device_private *priv; |
1da177e4 LT |
972 | struct ccw_device *cdev; |
973 | struct subchannel *sch; | |
974 | int ret; | |
975 | unsigned long flags; | |
976 | ||
c1637532 MS |
977 | priv = container_of(work, struct ccw_device_private, kick_work); |
978 | cdev = priv->cdev; | |
1da177e4 | 979 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
980 | /* |
981 | * Check if subchannel is still registered. It may have become | |
982 | * unregistered if a machine check hit us after finishing | |
983 | * device recognition but before the register work could be | |
984 | * queued. | |
985 | */ | |
986 | if (!device_is_registered(&sch->dev)) | |
987 | goto out_err; | |
82b7ac05 | 988 | css_update_ssd_info(sch); |
47af5518 CH |
989 | /* |
990 | * io_subchannel_register() will also be called after device | |
991 | * recognition has been done for a boxed device (which will already | |
992 | * be registered). We need to reprobe since we may now have sense id | |
993 | * information. | |
994 | */ | |
d6a30761 | 995 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
996 | if (!cdev->drv) { |
997 | ret = device_reprobe(&cdev->dev); | |
998 | if (ret) | |
999 | /* We can't do much here. */ | |
139b83dd | 1000 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
1001 | " %d for 0.%x.%04x\n", ret, |
1002 | cdev->private->dev_id.ssid, | |
1003 | cdev->private->dev_id.devno); | |
47af5518 | 1004 | } |
1da177e4 LT |
1005 | goto out; |
1006 | } | |
fa1a8c23 CH |
1007 | /* |
1008 | * Now we know this subchannel will stay, we can throw | |
1009 | * our delayed uevent. | |
1010 | */ | |
f67f129e | 1011 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 1012 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
1013 | /* make it known to the system */ |
1014 | ret = ccw_device_register(cdev); | |
1015 | if (ret) { | |
e556bbbd CH |
1016 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
1017 | cdev->private->dev_id.ssid, | |
1018 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 1019 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 1020 | sch_set_cdev(sch, NULL); |
2ec22984 | 1021 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
1022 | /* Release initial device reference. */ |
1023 | put_device(&cdev->dev); | |
5fb6b854 | 1024 | goto out_err; |
1da177e4 | 1025 | } |
1da177e4 LT |
1026 | out: |
1027 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 1028 | wake_up(&cdev->private->wait_q); |
5fb6b854 CH |
1029 | out_err: |
1030 | /* Release reference for workqueue processing. */ | |
1031 | put_device(&cdev->dev); | |
1da177e4 LT |
1032 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1033 | wake_up(&ccw_device_init_wq); | |
1034 | } | |
1035 | ||
3f4cf6e7 | 1036 | static void ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 1037 | { |
c1637532 MS |
1038 | struct ccw_device_private *priv; |
1039 | struct ccw_device *cdev; | |
1da177e4 LT |
1040 | struct subchannel *sch; |
1041 | ||
c1637532 MS |
1042 | priv = container_of(work, struct ccw_device_private, kick_work); |
1043 | cdev = priv->cdev; | |
46fbe4e4 PO |
1044 | /* Get subchannel reference for local processing. */ |
1045 | if (!get_device(cdev->dev.parent)) | |
1046 | return; | |
1da177e4 | 1047 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 1048 | css_sch_device_unregister(sch); |
46fbe4e4 | 1049 | /* Release cdev reference for workqueue processing.*/ |
1da177e4 | 1050 | put_device(&cdev->dev); |
46fbe4e4 | 1051 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
1052 | put_device(&sch->dev); |
1053 | } | |
1054 | ||
c4621a62 SO |
1055 | void ccw_device_schedule_sch_unregister(struct ccw_device *cdev) |
1056 | { | |
be7a2ddc SO |
1057 | /* Get cdev reference for workqueue processing. */ |
1058 | if (!get_device(&cdev->dev)) | |
1059 | return; | |
c4621a62 SO |
1060 | PREPARE_WORK(&cdev->private->kick_work, |
1061 | ccw_device_call_sch_unregister); | |
1062 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1063 | } | |
1064 | ||
1da177e4 LT |
1065 | /* |
1066 | * subchannel recognition done. Called from the state machine. | |
1067 | */ | |
1068 | void | |
1069 | io_subchannel_recog_done(struct ccw_device *cdev) | |
1070 | { | |
1da177e4 LT |
1071 | if (css_init_done == 0) { |
1072 | cdev->private->flags.recog_done = 1; | |
1073 | return; | |
1074 | } | |
1075 | switch (cdev->private->state) { | |
47593bfa SO |
1076 | case DEV_STATE_BOXED: |
1077 | /* Device did not respond in time. */ | |
1da177e4 LT |
1078 | case DEV_STATE_NOT_OPER: |
1079 | cdev->private->flags.recog_done = 1; | |
c4621a62 | 1080 | ccw_device_schedule_sch_unregister(cdev); |
1da177e4 LT |
1081 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1082 | wake_up(&ccw_device_init_wq); | |
1083 | break; | |
1da177e4 LT |
1084 | case DEV_STATE_OFFLINE: |
1085 | /* | |
1086 | * We can't register the device in interrupt context so | |
1087 | * we schedule a work item. | |
1088 | */ | |
1089 | if (!get_device(&cdev->dev)) | |
1090 | break; | |
1091 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1092 | io_subchannel_register); |
1da177e4 LT |
1093 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1094 | break; | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | static int | |
1099 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
1100 | { | |
1101 | int rc; | |
1102 | struct ccw_device_private *priv; | |
1103 | ||
db6a6423 | 1104 | sch_set_cdev(sch, cdev); |
2ec22984 | 1105 | cdev->ccwlock = sch->lock; |
fb6958a5 | 1106 | |
1da177e4 LT |
1107 | /* Init private data. */ |
1108 | priv = cdev->private; | |
78964268 CH |
1109 | priv->dev_id.devno = sch->schib.pmcw.dev; |
1110 | priv->dev_id.ssid = sch->schid.ssid; | |
1111 | priv->schid = sch->schid; | |
1da177e4 LT |
1112 | priv->state = DEV_STATE_NOT_OPER; |
1113 | INIT_LIST_HEAD(&priv->cmb_list); | |
1114 | init_waitqueue_head(&priv->wait_q); | |
1115 | init_timer(&priv->timer); | |
1116 | ||
1da177e4 LT |
1117 | /* Increase counter of devices currently in recognition. */ |
1118 | atomic_inc(&ccw_device_init_count); | |
1119 | ||
1120 | /* Start async. device sensing. */ | |
2ec22984 | 1121 | spin_lock_irq(sch->lock); |
1da177e4 | 1122 | rc = ccw_device_recognition(cdev); |
2ec22984 | 1123 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
1124 | if (rc) { |
1125 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1126 | wake_up(&ccw_device_init_wq); | |
1127 | } | |
1128 | return rc; | |
1129 | } | |
1130 | ||
d7b5a4c9 CH |
1131 | static void ccw_device_move_to_sch(struct work_struct *work) |
1132 | { | |
1133 | struct ccw_device_private *priv; | |
1134 | int rc; | |
1135 | struct subchannel *sch; | |
1136 | struct ccw_device *cdev; | |
1137 | struct subchannel *former_parent; | |
1138 | ||
1139 | priv = container_of(work, struct ccw_device_private, kick_work); | |
1140 | sch = priv->sch; | |
1141 | cdev = priv->cdev; | |
6eff208f CH |
1142 | former_parent = to_subchannel(cdev->dev.parent); |
1143 | /* Get reference for new parent. */ | |
1144 | if (!get_device(&sch->dev)) | |
1145 | return; | |
d7b5a4c9 | 1146 | mutex_lock(&sch->reg_mutex); |
6eff208f CH |
1147 | /* |
1148 | * Try to move the ccw device to its new subchannel. | |
1149 | * Note: device_move() changes cdev->dev.parent | |
1150 | */ | |
ffa6a705 | 1151 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
1152 | mutex_unlock(&sch->reg_mutex); |
1153 | if (rc) { | |
139b83dd | 1154 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel " |
d7b5a4c9 CH |
1155 | "0.%x.%04x failed (ret=%d)!\n", |
1156 | cdev->private->dev_id.ssid, | |
1157 | cdev->private->dev_id.devno, sch->schid.ssid, | |
1158 | sch->schid.sch_no, rc); | |
1159 | css_sch_device_unregister(sch); | |
6eff208f CH |
1160 | /* Put reference for new parent again. */ |
1161 | put_device(&sch->dev); | |
d7b5a4c9 CH |
1162 | goto out; |
1163 | } | |
6eff208f | 1164 | if (!sch_is_pseudo_sch(former_parent)) { |
d7b5a4c9 | 1165 | spin_lock_irq(former_parent->lock); |
db6a6423 | 1166 | sch_set_cdev(former_parent, NULL); |
d7b5a4c9 CH |
1167 | spin_unlock_irq(former_parent->lock); |
1168 | css_sch_device_unregister(former_parent); | |
1169 | /* Reset intparm to zeroes. */ | |
13952ec1 SO |
1170 | former_parent->config.intparm = 0; |
1171 | cio_commit_config(former_parent); | |
d7b5a4c9 CH |
1172 | } |
1173 | sch_attach_device(sch, cdev); | |
1174 | out: | |
6eff208f CH |
1175 | /* Put reference for old parent. */ |
1176 | put_device(&former_parent->dev); | |
d7b5a4c9 CH |
1177 | put_device(&cdev->dev); |
1178 | } | |
1179 | ||
602b20f2 CH |
1180 | static void io_subchannel_irq(struct subchannel *sch) |
1181 | { | |
1182 | struct ccw_device *cdev; | |
1183 | ||
db6a6423 | 1184 | cdev = sch_get_cdev(sch); |
602b20f2 | 1185 | |
efd986db SO |
1186 | CIO_TRACE_EVENT(6, "IRQ"); |
1187 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
1188 | if (cdev) |
1189 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1190 | } | |
1191 | ||
13952ec1 SO |
1192 | void io_subchannel_init_config(struct subchannel *sch) |
1193 | { | |
1194 | memset(&sch->config, 0, sizeof(sch->config)); | |
1195 | sch->config.csense = 1; | |
d36f0c66 SO |
1196 | /* Use subchannel mp mode when there is more than 1 installed CHPID. */ |
1197 | if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0) | |
13952ec1 SO |
1198 | sch->config.mp = 1; |
1199 | } | |
1200 | ||
0ae7a7b2 CH |
1201 | static void io_subchannel_init_fields(struct subchannel *sch) |
1202 | { | |
1203 | if (cio_is_console(sch->schid)) | |
1204 | sch->opm = 0xff; | |
1205 | else | |
1206 | sch->opm = chp_get_sch_opm(sch); | |
1207 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1208 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1209 | |
1210 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1211 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1212 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1213 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1214 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1215 | |
1216 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1217 | } |
1218 | ||
90ed2b69 CH |
1219 | static void io_subchannel_do_unreg(struct work_struct *work) |
1220 | { | |
1221 | struct subchannel *sch; | |
1222 | ||
1223 | sch = container_of(work, struct subchannel, work); | |
1224 | css_sch_device_unregister(sch); | |
90ed2b69 CH |
1225 | put_device(&sch->dev); |
1226 | } | |
1227 | ||
1228 | /* Schedule unregister if we have no cdev. */ | |
1229 | static void io_subchannel_schedule_removal(struct subchannel *sch) | |
1230 | { | |
1231 | get_device(&sch->dev); | |
1232 | INIT_WORK(&sch->work, io_subchannel_do_unreg); | |
1233 | queue_work(slow_path_wq, &sch->work); | |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * Note: We always return 0 so that we bind to the device even on error. | |
1238 | * This is needed so that our remove function is called on unregister. | |
1239 | */ | |
0ae7a7b2 | 1240 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1241 | { |
1da177e4 LT |
1242 | struct ccw_device *cdev; |
1243 | int rc; | |
1244 | unsigned long flags; | |
d7b5a4c9 | 1245 | struct ccw_dev_id dev_id; |
1da177e4 | 1246 | |
db6a6423 CH |
1247 | cdev = sch_get_cdev(sch); |
1248 | if (cdev) { | |
7e9db9ea CH |
1249 | rc = sysfs_create_group(&sch->dev.kobj, |
1250 | &io_subchannel_attr_group); | |
1251 | if (rc) | |
1252 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1253 | "attributes for subchannel " | |
1254 | "0.%x.%04x (rc=%d)\n", | |
1255 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 LT |
1256 | /* |
1257 | * This subchannel already has an associated ccw_device. | |
7e9db9ea CH |
1258 | * Throw the delayed uevent for the subchannel, register |
1259 | * the ccw_device and exit. This happens for all early | |
1260 | * devices, e.g. the console. | |
1da177e4 | 1261 | */ |
f67f129e | 1262 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1263 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
e1031786 | 1264 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1265 | device_initialize(&cdev->dev); |
1266 | ccw_device_register(cdev); | |
1da177e4 LT |
1267 | /* |
1268 | * Check if the device is already online. If it is | |
9cd67421 CH |
1269 | * the reference count needs to be corrected since we |
1270 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1271 | */ |
1272 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1273 | cdev->private->state != DEV_STATE_OFFLINE && | |
1274 | cdev->private->state != DEV_STATE_BOXED) | |
1275 | get_device(&cdev->dev); | |
1276 | return 0; | |
1277 | } | |
0ae7a7b2 | 1278 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1279 | rc = cio_commit_config(sch); |
1280 | if (rc) | |
1281 | goto out_schedule; | |
7e9db9ea CH |
1282 | rc = sysfs_create_group(&sch->dev.kobj, |
1283 | &io_subchannel_attr_group); | |
1284 | if (rc) | |
90ed2b69 | 1285 | goto out_schedule; |
cd6b4f27 CH |
1286 | /* Allocate I/O subchannel private data. */ |
1287 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1288 | GFP_KERNEL | GFP_DMA); | |
90ed2b69 | 1289 | if (!sch->private) |
7e9db9ea | 1290 | goto out_err; |
111e95a4 SO |
1291 | /* |
1292 | * First check if a fitting device may be found amongst the | |
1293 | * disconnected devices or in the orphanage. | |
1294 | */ | |
1295 | dev_id.devno = sch->schib.pmcw.dev; | |
1296 | dev_id.ssid = sch->schid.ssid; | |
d7b5a4c9 CH |
1297 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); |
1298 | if (!cdev) | |
1299 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1300 | &dev_id); | |
1301 | if (cdev) { | |
1302 | /* | |
1303 | * Schedule moving the device until when we have a registered | |
1304 | * subchannel to move to and succeed the probe. We can | |
1305 | * unregister later again, when the probe is through. | |
1306 | */ | |
1307 | cdev->private->sch = sch; | |
1308 | PREPARE_WORK(&cdev->private->kick_work, | |
1309 | ccw_device_move_to_sch); | |
1310 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1311 | return 0; | |
1312 | } | |
7674da77 | 1313 | cdev = io_subchannel_create_ccwdev(sch); |
90ed2b69 | 1314 | if (IS_ERR(cdev)) |
7e9db9ea | 1315 | goto out_err; |
8bbace7e | 1316 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1317 | if (rc) { |
2ec22984 | 1318 | spin_lock_irqsave(sch->lock, flags); |
90ed2b69 | 1319 | io_subchannel_recog_done(cdev); |
2ec22984 | 1320 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 | 1321 | } |
7e9db9ea CH |
1322 | return 0; |
1323 | out_err: | |
1324 | kfree(sch->private); | |
1325 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); | |
90ed2b69 CH |
1326 | out_schedule: |
1327 | io_subchannel_schedule_removal(sch); | |
1328 | return 0; | |
1da177e4 LT |
1329 | } |
1330 | ||
1da177e4 | 1331 | static int |
8bbace7e | 1332 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1333 | { |
1334 | struct ccw_device *cdev; | |
1335 | unsigned long flags; | |
1336 | ||
db6a6423 CH |
1337 | cdev = sch_get_cdev(sch); |
1338 | if (!cdev) | |
1da177e4 | 1339 | return 0; |
1da177e4 LT |
1340 | /* Set ccw device to not operational and drop reference. */ |
1341 | spin_lock_irqsave(cdev->ccwlock, flags); | |
db6a6423 | 1342 | sch_set_cdev(sch, NULL); |
1da177e4 LT |
1343 | cdev->private->state = DEV_STATE_NOT_OPER; |
1344 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c | 1345 | ccw_device_unregister(cdev); |
cd6b4f27 | 1346 | kfree(sch->private); |
7e9db9ea | 1347 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1348 | return 0; |
1349 | } | |
1350 | ||
602b20f2 | 1351 | static int io_subchannel_notify(struct subchannel *sch, int event) |
1da177e4 LT |
1352 | { |
1353 | struct ccw_device *cdev; | |
1354 | ||
db6a6423 | 1355 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1356 | if (!cdev) |
1357 | return 0; | |
c820de39 | 1358 | return ccw_device_notify(cdev, event); |
1da177e4 LT |
1359 | } |
1360 | ||
602b20f2 | 1361 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1362 | { |
1363 | struct ccw_device *cdev; | |
1364 | ||
db6a6423 | 1365 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1366 | if (cdev) |
1367 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1368 | } | |
1369 | ||
c820de39 | 1370 | static int check_for_io_on_path(struct subchannel *sch, int mask) |
1da177e4 | 1371 | { |
cdb912a4 | 1372 | if (cio_update_schib(sch)) |
c820de39 | 1373 | return 0; |
23d805b6 | 1374 | if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask) |
c820de39 CH |
1375 | return 1; |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | static void terminate_internal_io(struct subchannel *sch, | |
1380 | struct ccw_device *cdev) | |
1381 | { | |
1382 | if (cio_clear(sch)) { | |
1383 | /* Recheck device in case clear failed. */ | |
1384 | sch->lpm = 0; | |
1385 | if (cdev->online) | |
1386 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1387 | else | |
1388 | css_schedule_eval(sch->schid); | |
d23861ff | 1389 | return; |
c820de39 | 1390 | } |
1da177e4 | 1391 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
c820de39 CH |
1392 | /* Request retry of internal operation. */ |
1393 | cdev->private->flags.intretry = 1; | |
1394 | /* Call handler. */ | |
1da177e4 LT |
1395 | if (cdev->handler) |
1396 | cdev->handler(cdev, cdev->private->intparm, | |
1397 | ERR_PTR(-EIO)); | |
1398 | } | |
1399 | ||
c820de39 CH |
1400 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1401 | { | |
1402 | struct ccw_device *cdev; | |
1403 | ||
1404 | cdev = sch_get_cdev(sch); | |
1405 | if (!cdev) | |
1406 | return; | |
1407 | if (check_for_io_on_path(sch, mask)) { | |
1408 | if (cdev->private->state == DEV_STATE_ONLINE) | |
1409 | ccw_device_kill_io(cdev); | |
1410 | else { | |
1411 | terminate_internal_io(sch, cdev); | |
1412 | /* Re-start path verification. */ | |
1413 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1414 | } | |
1415 | } else | |
1416 | /* trigger path verification. */ | |
1417 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1418 | ||
1419 | } | |
1420 | ||
99611f87 CH |
1421 | static int io_subchannel_chp_event(struct subchannel *sch, |
1422 | struct chp_link *link, int event) | |
c820de39 CH |
1423 | { |
1424 | int mask; | |
c820de39 | 1425 | |
99611f87 | 1426 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1427 | if (!mask) |
1428 | return 0; | |
1429 | switch (event) { | |
1430 | case CHP_VARY_OFF: | |
1431 | sch->opm &= ~mask; | |
1432 | sch->lpm &= ~mask; | |
1433 | io_subchannel_terminate_path(sch, mask); | |
1434 | break; | |
1435 | case CHP_VARY_ON: | |
1436 | sch->opm |= mask; | |
1437 | sch->lpm |= mask; | |
1438 | io_subchannel_verify(sch); | |
1439 | break; | |
1440 | case CHP_OFFLINE: | |
cdb912a4 | 1441 | if (cio_update_schib(sch)) |
c820de39 CH |
1442 | return -ENODEV; |
1443 | io_subchannel_terminate_path(sch, mask); | |
1444 | break; | |
1445 | case CHP_ONLINE: | |
cdb912a4 SO |
1446 | if (cio_update_schib(sch)) |
1447 | return -ENODEV; | |
c820de39 CH |
1448 | sch->lpm |= mask & sch->opm; |
1449 | io_subchannel_verify(sch); | |
1450 | break; | |
1451 | } | |
1452 | return 0; | |
1453 | } | |
1454 | ||
1da177e4 | 1455 | static void |
8bbace7e | 1456 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1457 | { |
1da177e4 LT |
1458 | struct ccw_device *cdev; |
1459 | int ret; | |
1460 | ||
db6a6423 | 1461 | cdev = sch_get_cdev(sch); |
1da177e4 | 1462 | |
a8237fc4 | 1463 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1464 | return; |
1465 | if (!sch->schib.pmcw.ena) | |
1466 | /* Nothing to do. */ | |
1467 | return; | |
1468 | ret = cio_disable_subchannel(sch); | |
1469 | if (ret != -EBUSY) | |
1470 | /* Subchannel is disabled, we're done. */ | |
1471 | return; | |
1472 | cdev->private->state = DEV_STATE_QUIESCE; | |
1473 | if (cdev->handler) | |
1474 | cdev->handler(cdev, cdev->private->intparm, | |
1475 | ERR_PTR(-EIO)); | |
1476 | ret = ccw_device_cancel_halt_clear(cdev); | |
1477 | if (ret == -EBUSY) { | |
1478 | ccw_device_set_timeout(cdev, HZ/10); | |
1479 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1480 | } | |
1481 | cio_disable_subchannel(sch); | |
1482 | } | |
1483 | ||
c820de39 CH |
1484 | static int io_subchannel_get_status(struct subchannel *sch) |
1485 | { | |
1486 | struct schib schib; | |
1487 | ||
1488 | if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) | |
1489 | return CIO_GONE; | |
1490 | if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) | |
1491 | return CIO_REVALIDATE; | |
1492 | if (!sch->lpm) | |
1493 | return CIO_NO_PATH; | |
1494 | return CIO_OPER; | |
1495 | } | |
1496 | ||
1497 | static int device_is_disconnected(struct ccw_device *cdev) | |
1498 | { | |
1499 | if (!cdev) | |
1500 | return 0; | |
1501 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1502 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1503 | } | |
1504 | ||
1505 | static int recovery_check(struct device *dev, void *data) | |
1506 | { | |
1507 | struct ccw_device *cdev = to_ccwdev(dev); | |
1508 | int *redo = data; | |
1509 | ||
1510 | spin_lock_irq(cdev->ccwlock); | |
1511 | switch (cdev->private->state) { | |
1512 | case DEV_STATE_DISCONNECTED: | |
1513 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1514 | cdev->private->dev_id.ssid, | |
1515 | cdev->private->dev_id.devno); | |
1516 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1517 | *redo = 1; | |
1518 | break; | |
1519 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1520 | *redo = 1; | |
1521 | break; | |
1522 | } | |
1523 | spin_unlock_irq(cdev->ccwlock); | |
1524 | ||
1525 | return 0; | |
1526 | } | |
1527 | ||
1528 | static void recovery_work_func(struct work_struct *unused) | |
1529 | { | |
1530 | int redo = 0; | |
1531 | ||
1532 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1533 | if (redo) { | |
1534 | spin_lock_irq(&recovery_lock); | |
1535 | if (!timer_pending(&recovery_timer)) { | |
1536 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1537 | recovery_phase++; | |
1538 | mod_timer(&recovery_timer, jiffies + | |
1539 | recovery_delay[recovery_phase] * HZ); | |
1540 | } | |
1541 | spin_unlock_irq(&recovery_lock); | |
1542 | } else | |
1543 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1544 | } | |
1545 | ||
1546 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1547 | ||
1548 | static void recovery_func(unsigned long data) | |
1549 | { | |
1550 | /* | |
1551 | * We can't do our recovery in softirq context and it's not | |
1552 | * performance critical, so we schedule it. | |
1553 | */ | |
1554 | schedule_work(&recovery_work); | |
1555 | } | |
1556 | ||
1557 | static void ccw_device_schedule_recovery(void) | |
1558 | { | |
1559 | unsigned long flags; | |
1560 | ||
1561 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1562 | spin_lock_irqsave(&recovery_lock, flags); | |
1563 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1564 | recovery_phase = 0; | |
1565 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1566 | } | |
1567 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1568 | } | |
1569 | ||
ecf5d9ef PO |
1570 | static int purge_fn(struct device *dev, void *data) |
1571 | { | |
1572 | struct ccw_device *cdev = to_ccwdev(dev); | |
1573 | struct ccw_device_private *priv = cdev->private; | |
1574 | int unreg; | |
1575 | ||
1576 | spin_lock_irq(cdev->ccwlock); | |
1577 | unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) && | |
1578 | (priv->state == DEV_STATE_OFFLINE); | |
1579 | spin_unlock_irq(cdev->ccwlock); | |
1580 | if (!unreg) | |
1581 | goto out; | |
ecf5d9ef PO |
1582 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid, |
1583 | priv->dev_id.devno); | |
c4621a62 | 1584 | ccw_device_schedule_sch_unregister(cdev); |
ecf5d9ef PO |
1585 | |
1586 | out: | |
1587 | /* Abort loop in case of pending signal. */ | |
1588 | if (signal_pending(current)) | |
1589 | return -EINTR; | |
1590 | ||
1591 | return 0; | |
1592 | } | |
1593 | ||
1594 | /** | |
1595 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1596 | * | |
1597 | * Unregister all ccw devices that are offline and on the blacklist. | |
1598 | */ | |
1599 | int ccw_purge_blacklisted(void) | |
1600 | { | |
1601 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1602 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1603 | return 0; | |
1604 | } | |
1605 | ||
c820de39 CH |
1606 | static void device_set_disconnected(struct ccw_device *cdev) |
1607 | { | |
1608 | if (!cdev) | |
1609 | return; | |
1610 | ccw_device_set_timeout(cdev, 0); | |
1611 | cdev->private->flags.fake_irb = 0; | |
1612 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1613 | if (cdev->online) | |
1614 | ccw_device_schedule_recovery(); | |
1615 | } | |
1616 | ||
91c36919 PO |
1617 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1618 | { | |
1619 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1620 | ||
1621 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1622 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1623 | ccw_device_set_timeout(cdev, 0); |
1624 | cio_disable_subchannel(sch); | |
1625 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1626 | } | |
1627 | ||
c820de39 CH |
1628 | static int io_subchannel_sch_event(struct subchannel *sch, int slow) |
1629 | { | |
1630 | int event, ret, disc; | |
1631 | unsigned long flags; | |
91c36919 | 1632 | enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE, DISC } action; |
c820de39 CH |
1633 | struct ccw_device *cdev; |
1634 | ||
1635 | spin_lock_irqsave(sch->lock, flags); | |
1636 | cdev = sch_get_cdev(sch); | |
1637 | disc = device_is_disconnected(cdev); | |
1638 | if (disc && slow) { | |
1639 | /* Disconnected devices are evaluated directly only.*/ | |
1640 | spin_unlock_irqrestore(sch->lock, flags); | |
1641 | return 0; | |
1642 | } | |
1643 | /* No interrupt after machine check - kill pending timers. */ | |
1644 | if (cdev) | |
1645 | ccw_device_set_timeout(cdev, 0); | |
1646 | if (!disc && !slow) { | |
1647 | /* Non-disconnected devices are evaluated on the slow path. */ | |
1648 | spin_unlock_irqrestore(sch->lock, flags); | |
1649 | return -EAGAIN; | |
1650 | } | |
1651 | event = io_subchannel_get_status(sch); | |
1652 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", | |
1653 | sch->schid.ssid, sch->schid.sch_no, event, | |
1654 | disc ? "disconnected" : "normal", | |
1655 | slow ? "slow" : "fast"); | |
1656 | /* Analyze subchannel status. */ | |
1657 | action = NONE; | |
1658 | switch (event) { | |
1659 | case CIO_NO_PATH: | |
1660 | if (disc) { | |
1661 | /* Check if paths have become available. */ | |
1662 | action = REPROBE; | |
1663 | break; | |
1664 | } | |
1665 | /* fall through */ | |
1666 | case CIO_GONE: | |
c820de39 | 1667 | /* Ask driver what to do with device. */ |
91c36919 PO |
1668 | if (io_subchannel_notify(sch, event)) |
1669 | action = DISC; | |
1670 | else | |
1671 | action = UNREGISTER; | |
c820de39 CH |
1672 | break; |
1673 | case CIO_REVALIDATE: | |
1674 | /* Device will be removed, so no notify necessary. */ | |
1675 | if (disc) | |
1676 | /* Reprobe because immediate unregister might block. */ | |
1677 | action = REPROBE; | |
1678 | else | |
1679 | action = UNREGISTER_PROBE; | |
1680 | break; | |
1681 | case CIO_OPER: | |
1682 | if (disc) | |
1683 | /* Get device operational again. */ | |
1684 | action = REPROBE; | |
1685 | break; | |
1686 | } | |
1687 | /* Perform action. */ | |
1688 | ret = 0; | |
1689 | switch (action) { | |
1690 | case UNREGISTER: | |
1691 | case UNREGISTER_PROBE: | |
91c36919 | 1692 | ccw_device_set_notoper(cdev); |
c820de39 CH |
1693 | /* Unregister device (will use subchannel lock). */ |
1694 | spin_unlock_irqrestore(sch->lock, flags); | |
1695 | css_sch_device_unregister(sch); | |
1696 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 CH |
1697 | break; |
1698 | case REPROBE: | |
1699 | ccw_device_trigger_reprobe(cdev); | |
1700 | break; | |
91c36919 PO |
1701 | case DISC: |
1702 | device_set_disconnected(cdev); | |
1703 | break; | |
c820de39 CH |
1704 | default: |
1705 | break; | |
1706 | } | |
1707 | spin_unlock_irqrestore(sch->lock, flags); | |
1708 | /* Probe if necessary. */ | |
1709 | if (action == UNREGISTER_PROBE) | |
1710 | ret = css_probe_device(sch->schid); | |
1711 | ||
1712 | return ret; | |
1713 | } | |
1714 | ||
1da177e4 LT |
1715 | #ifdef CONFIG_CCW_CONSOLE |
1716 | static struct ccw_device console_cdev; | |
1717 | static struct ccw_device_private console_private; | |
1718 | static int console_cdev_in_use; | |
1719 | ||
2ec22984 CH |
1720 | static DEFINE_SPINLOCK(ccw_console_lock); |
1721 | ||
1722 | spinlock_t * cio_get_console_lock(void) | |
1723 | { | |
1724 | return &ccw_console_lock; | |
1725 | } | |
1726 | ||
0ae7a7b2 CH |
1727 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1728 | struct subchannel *sch) | |
1da177e4 LT |
1729 | { |
1730 | int rc; | |
1731 | ||
cd6b4f27 CH |
1732 | /* Attach subchannel private data. */ |
1733 | sch->private = cio_get_console_priv(); | |
1734 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 | 1735 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1736 | rc = cio_commit_config(sch); |
1737 | if (rc) | |
1738 | return rc; | |
0ae7a7b2 | 1739 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1740 | /* Initialize the ccw_device structure. */ |
292888c8 | 1741 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1742 | rc = io_subchannel_recog(cdev, sch); |
1743 | if (rc) | |
1744 | return rc; | |
1745 | ||
1746 | /* Now wait for the async. recognition to come to an end. */ | |
1747 | spin_lock_irq(cdev->ccwlock); | |
1748 | while (!dev_fsm_final_state(cdev)) | |
1749 | wait_cons_dev(); | |
1750 | rc = -EIO; | |
1751 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1752 | goto out_unlock; | |
1753 | ccw_device_online(cdev); | |
1754 | while (!dev_fsm_final_state(cdev)) | |
1755 | wait_cons_dev(); | |
1756 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1757 | goto out_unlock; | |
1758 | rc = 0; | |
1759 | out_unlock: | |
1760 | spin_unlock_irq(cdev->ccwlock); | |
1761 | return 0; | |
1762 | } | |
1763 | ||
1764 | struct ccw_device * | |
1765 | ccw_device_probe_console(void) | |
1766 | { | |
1767 | struct subchannel *sch; | |
1768 | int ret; | |
1769 | ||
1770 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1771 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1772 | sch = cio_probe_console(); |
1773 | if (IS_ERR(sch)) { | |
1774 | console_cdev_in_use = 0; | |
1775 | return (void *) sch; | |
1776 | } | |
1777 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1778 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1779 | console_cdev.private = &console_private; | |
c1637532 | 1780 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1781 | ret = ccw_device_console_enable(&console_cdev, sch); |
1782 | if (ret) { | |
1783 | cio_release_console(); | |
1784 | console_cdev_in_use = 0; | |
1785 | return ERR_PTR(ret); | |
1786 | } | |
1787 | console_cdev.online = 1; | |
1788 | return &console_cdev; | |
1789 | } | |
1f4e7eda | 1790 | |
6664845c MS |
1791 | static int ccw_device_pm_restore(struct device *dev); |
1792 | ||
1793 | int ccw_device_force_console(void) | |
1794 | { | |
1795 | if (!console_cdev_in_use) | |
1796 | return -ENODEV; | |
1797 | return ccw_device_pm_restore(&console_cdev.dev); | |
1798 | } | |
1799 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1800 | #endif |
1801 | ||
1802 | /* | |
1803 | * get ccw_device matching the busid, but only if owned by cdrv | |
1804 | */ | |
b0744bd2 CH |
1805 | static int |
1806 | __ccwdev_check_busid(struct device *dev, void *id) | |
1807 | { | |
1808 | char *bus_id; | |
1809 | ||
12975aef | 1810 | bus_id = id; |
b0744bd2 | 1811 | |
98df67b3 | 1812 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1813 | } |
1814 | ||
1815 | ||
b2ffd8e9 CH |
1816 | /** |
1817 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1818 | * @cdrv: driver the device is owned by | |
1819 | * @bus_id: bus id of the device to be searched | |
1820 | * | |
1821 | * This function searches all devices owned by @cdrv for a device with a bus | |
1822 | * id matching @bus_id. | |
1823 | * Returns: | |
1824 | * If a match is found, its reference count of the found device is increased | |
1825 | * and it is returned; else %NULL is returned. | |
1826 | */ | |
1827 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1828 | const char *bus_id) | |
1da177e4 | 1829 | { |
b0744bd2 | 1830 | struct device *dev; |
1da177e4 LT |
1831 | struct device_driver *drv; |
1832 | ||
1833 | drv = get_driver(&cdrv->driver); | |
1834 | if (!drv) | |
b0744bd2 | 1835 | return NULL; |
1da177e4 | 1836 | |
b0744bd2 CH |
1837 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1838 | __ccwdev_check_busid); | |
1da177e4 LT |
1839 | put_driver(drv); |
1840 | ||
d2c993d8 | 1841 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1842 | } |
1843 | ||
1844 | /************************** device driver handling ************************/ | |
1845 | ||
1846 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1847 | * and release methods are initially very similar to the device_driver | |
1848 | * implementations, with the difference that they have ccw_device | |
1849 | * arguments. | |
1850 | * | |
1851 | * A ccw driver also contains the information that is needed for | |
1852 | * device matching. | |
1853 | */ | |
1854 | static int | |
1855 | ccw_device_probe (struct device *dev) | |
1856 | { | |
1857 | struct ccw_device *cdev = to_ccwdev(dev); | |
1858 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1859 | int ret; | |
1860 | ||
1861 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1862 | ||
1863 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1864 | ||
1865 | if (ret) { | |
d2c993d8 | 1866 | cdev->drv = NULL; |
1da177e4 LT |
1867 | return ret; |
1868 | } | |
1869 | ||
1870 | return 0; | |
1871 | } | |
1872 | ||
1873 | static int | |
1874 | ccw_device_remove (struct device *dev) | |
1875 | { | |
1876 | struct ccw_device *cdev = to_ccwdev(dev); | |
1877 | struct ccw_driver *cdrv = cdev->drv; | |
1878 | int ret; | |
1879 | ||
1da177e4 LT |
1880 | if (cdrv->remove) |
1881 | cdrv->remove(cdev); | |
1882 | if (cdev->online) { | |
1883 | cdev->online = 0; | |
1884 | spin_lock_irq(cdev->ccwlock); | |
1885 | ret = ccw_device_offline(cdev); | |
1886 | spin_unlock_irq(cdev->ccwlock); | |
1887 | if (ret == 0) | |
1888 | wait_event(cdev->private->wait_q, | |
1889 | dev_fsm_final_state(cdev)); | |
1890 | else | |
139b83dd | 1891 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1892 | "device 0.%x.%04x\n", |
1893 | ret, cdev->private->dev_id.ssid, | |
1894 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1895 | /* Give up reference obtained in ccw_device_set_online(). */ |
1896 | put_device(&cdev->dev); | |
1da177e4 LT |
1897 | } |
1898 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1899 | cdev->drv = NULL; |
1da177e4 LT |
1900 | return 0; |
1901 | } | |
1902 | ||
958974fb CH |
1903 | static void ccw_device_shutdown(struct device *dev) |
1904 | { | |
1905 | struct ccw_device *cdev; | |
1906 | ||
1907 | cdev = to_ccwdev(dev); | |
1908 | if (cdev->drv && cdev->drv->shutdown) | |
1909 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1910 | disable_cmf(cdev); |
958974fb CH |
1911 | } |
1912 | ||
823d494a SO |
1913 | static int ccw_device_pm_prepare(struct device *dev) |
1914 | { | |
1915 | struct ccw_device *cdev = to_ccwdev(dev); | |
1916 | ||
1917 | if (work_pending(&cdev->private->kick_work)) | |
1918 | return -EAGAIN; | |
1919 | /* Fail while device is being set online/offline. */ | |
1920 | if (atomic_read(&cdev->private->onoff)) | |
1921 | return -EAGAIN; | |
1922 | ||
1923 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1924 | return cdev->drv->prepare(cdev); | |
1925 | ||
1926 | return 0; | |
1927 | } | |
1928 | ||
1929 | static void ccw_device_pm_complete(struct device *dev) | |
1930 | { | |
1931 | struct ccw_device *cdev = to_ccwdev(dev); | |
1932 | ||
1933 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1934 | cdev->drv->complete(cdev); | |
1935 | } | |
1936 | ||
1937 | static int ccw_device_pm_freeze(struct device *dev) | |
1938 | { | |
1939 | struct ccw_device *cdev = to_ccwdev(dev); | |
1940 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1941 | int ret, cm_enabled; | |
1942 | ||
1943 | /* Fail suspend while device is in transistional state. */ | |
1944 | if (!dev_fsm_final_state(cdev)) | |
1945 | return -EAGAIN; | |
1946 | if (!cdev->online) | |
1947 | return 0; | |
1948 | if (cdev->drv && cdev->drv->freeze) { | |
1949 | ret = cdev->drv->freeze(cdev); | |
1950 | if (ret) | |
1951 | return ret; | |
1952 | } | |
1953 | ||
1954 | spin_lock_irq(sch->lock); | |
1955 | cm_enabled = cdev->private->cmb != NULL; | |
1956 | spin_unlock_irq(sch->lock); | |
1957 | if (cm_enabled) { | |
1958 | /* Don't have the css write on memory. */ | |
1959 | ret = ccw_set_cmf(cdev, 0); | |
1960 | if (ret) | |
1961 | return ret; | |
1962 | } | |
1963 | /* From here on, disallow device driver I/O. */ | |
1964 | spin_lock_irq(sch->lock); | |
1965 | ret = cio_disable_subchannel(sch); | |
1966 | spin_unlock_irq(sch->lock); | |
1967 | ||
1968 | return ret; | |
1969 | } | |
1970 | ||
1971 | static int ccw_device_pm_thaw(struct device *dev) | |
1972 | { | |
1973 | struct ccw_device *cdev = to_ccwdev(dev); | |
1974 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1975 | int ret, cm_enabled; | |
1976 | ||
1977 | if (!cdev->online) | |
1978 | return 0; | |
1979 | ||
1980 | spin_lock_irq(sch->lock); | |
1981 | /* Allow device driver I/O again. */ | |
1982 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1983 | cm_enabled = cdev->private->cmb != NULL; | |
1984 | spin_unlock_irq(sch->lock); | |
1985 | if (ret) | |
1986 | return ret; | |
1987 | ||
1988 | if (cm_enabled) { | |
1989 | ret = ccw_set_cmf(cdev, 1); | |
1990 | if (ret) | |
1991 | return ret; | |
1992 | } | |
1993 | ||
1994 | if (cdev->drv && cdev->drv->thaw) | |
1995 | ret = cdev->drv->thaw(cdev); | |
1996 | ||
1997 | return ret; | |
1998 | } | |
1999 | ||
2000 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
2001 | { | |
2002 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2003 | int ret; | |
2004 | ||
2005 | if (cio_is_console(sch->schid)) | |
2006 | goto out; | |
2007 | /* | |
2008 | * While we were sleeping, devices may have gone or become | |
2009 | * available again. Kick re-detection. | |
2010 | */ | |
2011 | spin_lock_irq(sch->lock); | |
2012 | cdev->private->flags.resuming = 1; | |
2013 | ret = ccw_device_recognition(cdev); | |
2014 | spin_unlock_irq(sch->lock); | |
2015 | if (ret) { | |
2016 | CIO_MSG_EVENT(0, "Couldn't start recognition for device " | |
f014824e SO |
2017 | "0.%x.%04x (ret=%d)\n", |
2018 | cdev->private->dev_id.ssid, | |
2019 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
2020 | spin_lock_irq(sch->lock); |
2021 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
2022 | spin_unlock_irq(sch->lock); | |
2023 | /* notify driver after the resume cb */ | |
2024 | goto out; | |
2025 | } | |
2026 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || | |
2027 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
2028 | ||
2029 | out: | |
2030 | cdev->private->flags.resuming = 0; | |
2031 | } | |
2032 | ||
2033 | static int resume_handle_boxed(struct ccw_device *cdev) | |
2034 | { | |
2035 | cdev->private->state = DEV_STATE_BOXED; | |
2036 | if (ccw_device_notify(cdev, CIO_BOXED)) | |
2037 | return 0; | |
2038 | ccw_device_schedule_sch_unregister(cdev); | |
2039 | return -ENODEV; | |
2040 | } | |
2041 | ||
2042 | static int resume_handle_disc(struct ccw_device *cdev) | |
2043 | { | |
2044 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
2045 | if (ccw_device_notify(cdev, CIO_GONE)) | |
2046 | return 0; | |
2047 | ccw_device_schedule_sch_unregister(cdev); | |
2048 | return -ENODEV; | |
2049 | } | |
2050 | ||
2051 | static int ccw_device_pm_restore(struct device *dev) | |
2052 | { | |
2053 | struct ccw_device *cdev = to_ccwdev(dev); | |
2054 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2055 | int ret = 0, cm_enabled; | |
2056 | ||
2057 | __ccw_device_pm_restore(cdev); | |
2058 | spin_lock_irq(sch->lock); | |
2059 | if (cio_is_console(sch->schid)) { | |
2060 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
2061 | spin_unlock_irq(sch->lock); | |
2062 | goto out_restore; | |
2063 | } | |
2064 | cdev->private->flags.donotify = 0; | |
2065 | /* check recognition results */ | |
2066 | switch (cdev->private->state) { | |
2067 | case DEV_STATE_OFFLINE: | |
2068 | break; | |
2069 | case DEV_STATE_BOXED: | |
2070 | ret = resume_handle_boxed(cdev); | |
2071 | spin_unlock_irq(sch->lock); | |
2072 | if (ret) | |
2073 | goto out; | |
2074 | goto out_restore; | |
2075 | case DEV_STATE_DISCONNECTED: | |
2076 | goto out_disc_unlock; | |
2077 | default: | |
2078 | goto out_unreg_unlock; | |
2079 | } | |
2080 | /* check if the device id has changed */ | |
2081 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
f014824e SO |
2082 | CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno " |
2083 | "changed from %04x to %04x)\n", | |
2084 | sch->schid.ssid, sch->schid.sch_no, | |
823d494a SO |
2085 | cdev->private->dev_id.devno, |
2086 | sch->schib.pmcw.dev); | |
2087 | goto out_unreg_unlock; | |
2088 | } | |
2089 | /* check if the device type has changed */ | |
2090 | if (!ccw_device_test_sense_data(cdev)) { | |
2091 | ccw_device_update_sense_data(cdev); | |
2092 | PREPARE_WORK(&cdev->private->kick_work, | |
2093 | ccw_device_do_unbind_bind); | |
2094 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
2095 | ret = -ENODEV; | |
2096 | goto out_unlock; | |
2097 | } | |
2098 | if (!cdev->online) { | |
2099 | ret = 0; | |
2100 | goto out_unlock; | |
2101 | } | |
2102 | ret = ccw_device_online(cdev); | |
2103 | if (ret) | |
2104 | goto out_disc_unlock; | |
2105 | ||
2106 | cm_enabled = cdev->private->cmb != NULL; | |
2107 | spin_unlock_irq(sch->lock); | |
2108 | ||
2109 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
2110 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
2111 | spin_lock_irq(sch->lock); | |
2112 | goto out_disc_unlock; | |
2113 | } | |
2114 | if (cm_enabled) { | |
2115 | ret = ccw_set_cmf(cdev, 1); | |
2116 | if (ret) { | |
f014824e SO |
2117 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
2118 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
2119 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
2120 | ret = 0; |
2121 | } | |
2122 | } | |
2123 | ||
2124 | out_restore: | |
2125 | if (cdev->online && cdev->drv && cdev->drv->restore) | |
2126 | ret = cdev->drv->restore(cdev); | |
2127 | out: | |
2128 | return ret; | |
2129 | ||
2130 | out_disc_unlock: | |
2131 | ret = resume_handle_disc(cdev); | |
2132 | spin_unlock_irq(sch->lock); | |
2133 | if (ret) | |
2134 | return ret; | |
2135 | goto out_restore; | |
2136 | ||
2137 | out_unreg_unlock: | |
2138 | ccw_device_schedule_sch_unregister(cdev); | |
2139 | ret = -ENODEV; | |
2140 | out_unlock: | |
2141 | spin_unlock_irq(sch->lock); | |
2142 | return ret; | |
2143 | } | |
2144 | ||
2145 | static struct dev_pm_ops ccw_pm_ops = { | |
2146 | .prepare = ccw_device_pm_prepare, | |
2147 | .complete = ccw_device_pm_complete, | |
2148 | .freeze = ccw_device_pm_freeze, | |
2149 | .thaw = ccw_device_pm_thaw, | |
2150 | .restore = ccw_device_pm_restore, | |
2151 | }; | |
2152 | ||
8bbace7e CH |
2153 | struct bus_type ccw_bus_type = { |
2154 | .name = "ccw", | |
2155 | .match = ccw_bus_match, | |
2156 | .uevent = ccw_uevent, | |
2157 | .probe = ccw_device_probe, | |
2158 | .remove = ccw_device_remove, | |
958974fb | 2159 | .shutdown = ccw_device_shutdown, |
823d494a | 2160 | .pm = &ccw_pm_ops, |
8bbace7e CH |
2161 | }; |
2162 | ||
b2ffd8e9 CH |
2163 | /** |
2164 | * ccw_driver_register() - register a ccw driver | |
2165 | * @cdriver: driver to be registered | |
2166 | * | |
2167 | * This function is mainly a wrapper around driver_register(). | |
2168 | * Returns: | |
2169 | * %0 on success and a negative error value on failure. | |
2170 | */ | |
2171 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2172 | { |
2173 | struct device_driver *drv = &cdriver->driver; | |
2174 | ||
2175 | drv->bus = &ccw_bus_type; | |
2176 | drv->name = cdriver->name; | |
4beee646 | 2177 | drv->owner = cdriver->owner; |
1da177e4 LT |
2178 | |
2179 | return driver_register(drv); | |
2180 | } | |
2181 | ||
b2ffd8e9 CH |
2182 | /** |
2183 | * ccw_driver_unregister() - deregister a ccw driver | |
2184 | * @cdriver: driver to be deregistered | |
2185 | * | |
2186 | * This function is mainly a wrapper around driver_unregister(). | |
2187 | */ | |
2188 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2189 | { |
2190 | driver_unregister(&cdriver->driver); | |
2191 | } | |
2192 | ||
a8237fc4 CH |
2193 | /* Helper func for qdio. */ |
2194 | struct subchannel_id | |
2195 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
2196 | { | |
2197 | struct subchannel *sch; | |
2198 | ||
2199 | sch = to_subchannel(cdev->dev.parent); | |
2200 | return sch->schid; | |
2201 | } | |
2202 | ||
1da177e4 LT |
2203 | MODULE_LICENSE("GPL"); |
2204 | EXPORT_SYMBOL(ccw_device_set_online); | |
2205 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2206 | EXPORT_SYMBOL(ccw_driver_register); | |
2207 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2208 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
2209 | EXPORT_SYMBOL(ccw_bus_type); | |
2210 | EXPORT_SYMBOL(ccw_device_work); | |
a8237fc4 | 2211 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |