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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 | 2 | * bus driver for ccw devices |
1da177e4 | 3 | * |
a53c8fab | 4 | * Copyright IBM Corp. 2002, 2008 |
1da177e4 | 5 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
4ce3b30c | 6 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 | 7 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
a00f761f PG |
8 | * |
9 | * License: GPL | |
1da177e4 | 10 | */ |
a7ae2c02 PO |
11 | |
12 | #define KMSG_COMPONENT "cio" | |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
14 | ||
a00f761f | 15 | #include <linux/export.h> |
1da177e4 LT |
16 | #include <linux/init.h> |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/list.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/workqueue.h> | |
188561a4 | 24 | #include <linux/delay.h> |
90ab1336 | 25 | #include <linux/timer.h> |
de400d6b | 26 | #include <linux/kernel_stat.h> |
174cd4b1 | 27 | #include <linux/sched/signal.h> |
1da177e4 LT |
28 | |
29 | #include <asm/ccwdev.h> | |
30 | #include <asm/cio.h> | |
4e57b681 | 31 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 32 | #include <asm/cmb.h> |
3a3fc29a | 33 | #include <asm/isc.h> |
1da177e4 | 34 | |
0ae7a7b2 | 35 | #include "chp.h" |
1da177e4 | 36 | #include "cio.h" |
d7b5a4c9 | 37 | #include "cio_debug.h" |
1da177e4 LT |
38 | #include "css.h" |
39 | #include "device.h" | |
40 | #include "ioasm.h" | |
cd6b4f27 | 41 | #include "io_sch.h" |
ecf5d9ef | 42 | #include "blacklist.h" |
fd0457a6 | 43 | #include "chsc.h" |
1da177e4 | 44 | |
90ab1336 | 45 | static struct timer_list recovery_timer; |
486d0a00 | 46 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
47 | static int recovery_phase; |
48 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
49 | ||
0ad8f714 SO |
50 | static atomic_t ccw_device_init_count = ATOMIC_INIT(0); |
51 | static DECLARE_WAIT_QUEUE_HEAD(ccw_device_init_wq); | |
52 | static struct bus_type ccw_bus_type; | |
53 | ||
1da177e4 LT |
54 | /******************* bus type handling ***********************/ |
55 | ||
56 | /* The Linux driver model distinguishes between a bus type and | |
57 | * the bus itself. Of course we only have one channel | |
58 | * subsystem driver and one channel system per machine, but | |
59 | * we still use the abstraction. T.R. says it's a good idea. */ | |
60 | static int | |
61 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
62 | { | |
63 | struct ccw_device *cdev = to_ccwdev(dev); | |
64 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
65 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
66 | ||
67 | if (!ids) | |
68 | return 0; | |
69 | ||
70 | found = ccw_device_id_match(ids, &cdev->id); | |
71 | if (!found) | |
72 | return 0; | |
73 | ||
74 | cdev->id.driver_info = found->driver_info; | |
75 | ||
76 | return 1; | |
77 | } | |
78 | ||
db0c2d59 PO |
79 | /* Store modalias string delimited by prefix/suffix string into buffer with |
80 | * specified size. Return length of resulting string (excluding trailing '\0') | |
81 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 82 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 83 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 84 | { |
db0c2d59 | 85 | int len; |
1da177e4 | 86 | |
cfbe9bb2 | 87 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
88 | if (len > size) |
89 | return len; | |
90 | buf += len; | |
91 | size -= len; | |
1da177e4 | 92 | |
db0c2d59 PO |
93 | if (id->dev_type != 0) |
94 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
95 | id->dev_model, suffix); | |
96 | else | |
97 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 98 | |
db0c2d59 PO |
99 | return len; |
100 | } | |
101 | ||
102 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
103 | * non-zero otherwise. */ | |
7eff2e7a | 104 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
105 | { |
106 | struct ccw_device *cdev = to_ccwdev(dev); | |
107 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
108 | int ret; |
109 | char modalias_buf[30]; | |
1da177e4 | 110 | |
db0c2d59 | 111 | /* CU_TYPE= */ |
7eff2e7a | 112 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
113 | if (ret) |
114 | return ret; | |
db0c2d59 PO |
115 | |
116 | /* CU_MODEL= */ | |
7eff2e7a | 117 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
118 | if (ret) |
119 | return ret; | |
1da177e4 LT |
120 | |
121 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 122 | /* DEV_TYPE= */ |
7eff2e7a | 123 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
124 | if (ret) |
125 | return ret; | |
1da177e4 | 126 | |
db0c2d59 | 127 | /* DEV_MODEL= */ |
7eff2e7a | 128 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
129 | if (ret) |
130 | return ret; | |
db0c2d59 PO |
131 | |
132 | /* MODALIAS= */ | |
cfbe9bb2 | 133 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
134 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
135 | return ret; | |
1da177e4 LT |
136 | } |
137 | ||
602b20f2 CH |
138 | static void io_subchannel_irq(struct subchannel *); |
139 | static int io_subchannel_probe(struct subchannel *); | |
140 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 141 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 142 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
143 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
144 | int); | |
8ea7f559 | 145 | static void recovery_func(unsigned long data); |
1da177e4 | 146 | |
f08adc00 CH |
147 | static struct css_device_id io_subchannel_ids[] = { |
148 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
149 | { /* end of list */ }, | |
150 | }; | |
f08adc00 | 151 | |
93a27592 CH |
152 | static int io_subchannel_prepare(struct subchannel *sch) |
153 | { | |
154 | struct ccw_device *cdev; | |
155 | /* | |
156 | * Don't allow suspend while a ccw device registration | |
157 | * is still outstanding. | |
158 | */ | |
159 | cdev = sch_get_cdev(sch); | |
160 | if (cdev && !device_is_registered(&cdev->dev)) | |
161 | return -EAGAIN; | |
162 | return 0; | |
163 | } | |
164 | ||
b4c70721 | 165 | static int io_subchannel_settle(void) |
8ea7f559 | 166 | { |
b4c70721 SO |
167 | int ret; |
168 | ||
169 | ret = wait_event_interruptible(ccw_device_init_wq, | |
170 | atomic_read(&ccw_device_init_count) == 0); | |
171 | if (ret) | |
172 | return -EINTR; | |
be5d3823 | 173 | flush_workqueue(cio_work_q); |
b4c70721 | 174 | return 0; |
8ea7f559 SO |
175 | } |
176 | ||
f7e5d67c | 177 | static struct css_driver io_subchannel_driver = { |
e6aed122 SO |
178 | .drv = { |
179 | .owner = THIS_MODULE, | |
180 | .name = "io_subchannel", | |
181 | }, | |
f08adc00 | 182 | .subchannel_type = io_subchannel_ids, |
1da177e4 | 183 | .irq = io_subchannel_irq, |
c820de39 CH |
184 | .sch_event = io_subchannel_sch_event, |
185 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
186 | .probe = io_subchannel_probe, |
187 | .remove = io_subchannel_remove, | |
188 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 189 | .prepare = io_subchannel_prepare, |
8ea7f559 | 190 | .settle = io_subchannel_settle, |
1da177e4 LT |
191 | }; |
192 | ||
2f17644d | 193 | int __init io_subchannel_init(void) |
1da177e4 LT |
194 | { |
195 | int ret; | |
196 | ||
90ab1336 | 197 | setup_timer(&recovery_timer, recovery_func, 0); |
be5d3823 SO |
198 | ret = bus_register(&ccw_bus_type); |
199 | if (ret) | |
200 | return ret; | |
25b7bb58 CH |
201 | ret = css_driver_register(&io_subchannel_driver); |
202 | if (ret) | |
be5d3823 | 203 | bus_unregister(&ccw_bus_type); |
1da177e4 | 204 | |
1da177e4 LT |
205 | return ret; |
206 | } | |
207 | ||
1da177e4 LT |
208 | |
209 | /************************ device handling **************************/ | |
210 | ||
1da177e4 | 211 | static ssize_t |
3fd3c0a5 | 212 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
213 | { |
214 | struct ccw_device *cdev = to_ccwdev(dev); | |
215 | struct ccw_device_id *id = &(cdev->id); | |
216 | ||
217 | if (id->dev_type != 0) | |
218 | return sprintf(buf, "%04x/%02x\n", | |
219 | id->dev_type, id->dev_model); | |
220 | else | |
221 | return sprintf(buf, "n/a\n"); | |
222 | } | |
223 | ||
224 | static ssize_t | |
3fd3c0a5 | 225 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
226 | { |
227 | struct ccw_device *cdev = to_ccwdev(dev); | |
228 | struct ccw_device_id *id = &(cdev->id); | |
229 | ||
230 | return sprintf(buf, "%04x/%02x\n", | |
231 | id->cu_type, id->cu_model); | |
232 | } | |
233 | ||
f1fc78a8 BB |
234 | static ssize_t |
235 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
236 | { | |
237 | struct ccw_device *cdev = to_ccwdev(dev); | |
238 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 239 | int len; |
f1fc78a8 | 240 | |
086a6c62 | 241 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
242 | |
243 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
244 | } |
245 | ||
1da177e4 | 246 | static ssize_t |
3fd3c0a5 | 247 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
248 | { |
249 | struct ccw_device *cdev = to_ccwdev(dev); | |
250 | ||
251 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
252 | } | |
253 | ||
d7b5a4c9 CH |
254 | int ccw_device_is_orphan(struct ccw_device *cdev) |
255 | { | |
256 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
257 | } | |
258 | ||
ef99516c | 259 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 260 | { |
7d253b9a | 261 | if (device_is_registered(&cdev->dev)) { |
24a1872d | 262 | /* Undo device_add(). */ |
ef99516c | 263 | device_del(&cdev->dev); |
24a1872d SO |
264 | } |
265 | if (cdev->private->flags.initialized) { | |
266 | cdev->private->flags.initialized = 0; | |
3b554a14 SO |
267 | /* Release reference from device_initialize(). */ |
268 | put_device(&cdev->dev); | |
269 | } | |
7674da77 CH |
270 | } |
271 | ||
d40f7b75 SO |
272 | static void io_subchannel_quiesce(struct subchannel *); |
273 | ||
b2ffd8e9 CH |
274 | /** |
275 | * ccw_device_set_offline() - disable a ccw device for I/O | |
276 | * @cdev: target ccw device | |
277 | * | |
278 | * This function calls the driver's set_offline() function for @cdev, if | |
279 | * given, and then disables @cdev. | |
280 | * Returns: | |
281 | * %0 on success and a negative error value on failure. | |
282 | * Context: | |
283 | * enabled, ccw device lock not held | |
284 | */ | |
285 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 | 286 | { |
d40f7b75 SO |
287 | struct subchannel *sch; |
288 | int ret, state; | |
1da177e4 LT |
289 | |
290 | if (!cdev) | |
291 | return -ENODEV; | |
292 | if (!cdev->online || !cdev->drv) | |
293 | return -EINVAL; | |
294 | ||
295 | if (cdev->drv->set_offline) { | |
296 | ret = cdev->drv->set_offline(cdev); | |
297 | if (ret != 0) | |
298 | return ret; | |
299 | } | |
1da177e4 | 300 | spin_lock_irq(cdev->ccwlock); |
d40f7b75 | 301 | sch = to_subchannel(cdev->dev.parent); |
74bd0d85 | 302 | cdev->online = 0; |
217ee6c6 ME |
303 | /* Wait until a final state or DISCONNECTED is reached */ |
304 | while (!dev_fsm_final_state(cdev) && | |
305 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 306 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
307 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
308 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
309 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 310 | } |
d40f7b75 SO |
311 | do { |
312 | ret = ccw_device_offline(cdev); | |
313 | if (!ret) | |
314 | break; | |
315 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " | |
316 | "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, | |
317 | cdev->private->dev_id.devno); | |
318 | if (ret != -EBUSY) | |
319 | goto error; | |
320 | state = cdev->private->state; | |
321 | spin_unlock_irq(cdev->ccwlock); | |
322 | io_subchannel_quiesce(sch); | |
323 | spin_lock_irq(cdev->ccwlock); | |
324 | cdev->private->state = state; | |
325 | } while (ret == -EBUSY); | |
1da177e4 | 326 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
327 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
328 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
a7ae2c02 PO |
329 | /* Inform the user if set offline failed. */ |
330 | if (cdev->private->state == DEV_STATE_BOXED) { | |
baebc70a JP |
331 | pr_warn("%s: The device entered boxed state while being set offline\n", |
332 | dev_name(&cdev->dev)); | |
a7ae2c02 | 333 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { |
baebc70a JP |
334 | pr_warn("%s: The device stopped operating while being set offline\n", |
335 | dev_name(&cdev->dev)); | |
a7ae2c02 | 336 | } |
217ee6c6 ME |
337 | /* Give up reference from ccw_device_set_online(). */ |
338 | put_device(&cdev->dev); | |
339 | return 0; | |
340 | ||
341 | error: | |
217ee6c6 ME |
342 | cdev->private->state = DEV_STATE_OFFLINE; |
343 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
344 | spin_unlock_irq(cdev->ccwlock); | |
345 | /* Give up reference from ccw_device_set_online(). */ | |
346 | put_device(&cdev->dev); | |
347 | return -ENODEV; | |
1da177e4 LT |
348 | } |
349 | ||
b2ffd8e9 CH |
350 | /** |
351 | * ccw_device_set_online() - enable a ccw device for I/O | |
352 | * @cdev: target ccw device | |
353 | * | |
354 | * This function first enables @cdev and then calls the driver's set_online() | |
355 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
356 | * disabled again. | |
357 | * Returns: | |
358 | * %0 on success and a negative error value on failure. | |
359 | * Context: | |
360 | * enabled, ccw device lock not held | |
361 | */ | |
362 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
363 | { |
364 | int ret; | |
217ee6c6 | 365 | int ret2; |
1da177e4 LT |
366 | |
367 | if (!cdev) | |
368 | return -ENODEV; | |
369 | if (cdev->online || !cdev->drv) | |
370 | return -EINVAL; | |
9cd67421 CH |
371 | /* Hold on to an extra reference while device is online. */ |
372 | if (!get_device(&cdev->dev)) | |
373 | return -ENODEV; | |
1da177e4 LT |
374 | |
375 | spin_lock_irq(cdev->ccwlock); | |
376 | ret = ccw_device_online(cdev); | |
377 | spin_unlock_irq(cdev->ccwlock); | |
378 | if (ret == 0) | |
379 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
380 | else { | |
139b83dd | 381 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
382 | "device 0.%x.%04x\n", |
383 | ret, cdev->private->dev_id.ssid, | |
384 | cdev->private->dev_id.devno); | |
9cd67421 CH |
385 | /* Give up online reference since onlining failed. */ |
386 | put_device(&cdev->dev); | |
1da177e4 LT |
387 | return ret; |
388 | } | |
217ee6c6 ME |
389 | spin_lock_irq(cdev->ccwlock); |
390 | /* Check if online processing was successful */ | |
391 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
392 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
393 | spin_unlock_irq(cdev->ccwlock); | |
a7ae2c02 PO |
394 | /* Inform the user that set online failed. */ |
395 | if (cdev->private->state == DEV_STATE_BOXED) { | |
baebc70a JP |
396 | pr_warn("%s: Setting the device online failed because it is boxed\n", |
397 | dev_name(&cdev->dev)); | |
a7ae2c02 | 398 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { |
baebc70a JP |
399 | pr_warn("%s: Setting the device online failed because it is not operational\n", |
400 | dev_name(&cdev->dev)); | |
a7ae2c02 | 401 | } |
9cd67421 CH |
402 | /* Give up online reference since onlining failed. */ |
403 | put_device(&cdev->dev); | |
1da177e4 | 404 | return -ENODEV; |
9cd67421 | 405 | } |
217ee6c6 ME |
406 | spin_unlock_irq(cdev->ccwlock); |
407 | if (cdev->drv->set_online) | |
408 | ret = cdev->drv->set_online(cdev); | |
409 | if (ret) | |
410 | goto rollback; | |
74bd0d85 SO |
411 | |
412 | spin_lock_irq(cdev->ccwlock); | |
217ee6c6 | 413 | cdev->online = 1; |
74bd0d85 | 414 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
415 | return 0; |
416 | ||
417 | rollback: | |
1da177e4 | 418 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
419 | /* Wait until a final state or DISCONNECTED is reached */ |
420 | while (!dev_fsm_final_state(cdev) && | |
421 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
422 | spin_unlock_irq(cdev->ccwlock); | |
423 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
424 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
425 | spin_lock_irq(cdev->ccwlock); | |
426 | } | |
427 | ret2 = ccw_device_offline(cdev); | |
428 | if (ret2) | |
429 | goto error; | |
430 | spin_unlock_irq(cdev->ccwlock); | |
431 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
432 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
433 | /* Give up online reference since onlining failed. */ | |
434 | put_device(&cdev->dev); | |
435 | return ret; | |
436 | ||
437 | error: | |
438 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
439 | "device 0.%x.%04x\n", | |
440 | ret2, cdev->private->dev_id.ssid, | |
441 | cdev->private->dev_id.devno); | |
442 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 443 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
444 | /* Give up online reference since onlining failed. */ |
445 | put_device(&cdev->dev); | |
217ee6c6 | 446 | return ret; |
1da177e4 LT |
447 | } |
448 | ||
e74fe0ce | 449 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 450 | { |
37de53bb PO |
451 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
452 | spin_lock_irq(cdev->ccwlock); | |
453 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
454 | spin_unlock_irq(cdev->ccwlock); | |
7cd40314 SO |
455 | return 0; |
456 | } | |
457 | if (cdev->drv && cdev->drv->set_offline) | |
e74fe0ce | 458 | return ccw_device_set_offline(cdev); |
7cd40314 | 459 | return -EINVAL; |
f5ba6c86 CH |
460 | } |
461 | ||
462 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
463 | { | |
f5ba6c86 | 464 | /* Do device recognition, if needed. */ |
99f6a570 | 465 | if (cdev->private->state == DEV_STATE_BOXED) { |
1f5bd384 | 466 | spin_lock_irq(cdev->ccwlock); |
736b5db8 | 467 | ccw_device_recognition(cdev); |
1f5bd384 | 468 | spin_unlock_irq(cdev->ccwlock); |
f5ba6c86 CH |
469 | wait_event(cdev->private->wait_q, |
470 | cdev->private->flags.recog_done); | |
156013ff SO |
471 | if (cdev->private->state != DEV_STATE_OFFLINE) |
472 | /* recognition failed */ | |
473 | return -EAGAIN; | |
f5ba6c86 CH |
474 | } |
475 | if (cdev->drv && cdev->drv->set_online) | |
7cd40314 SO |
476 | return ccw_device_set_online(cdev); |
477 | return -EINVAL; | |
f5ba6c86 | 478 | } |
156013ff | 479 | |
c78aa6cb | 480 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
481 | { |
482 | int ret; | |
483 | ||
484 | ret = online_store_recog_and_online(cdev); | |
156013ff | 485 | if (ret && !force) |
c78aa6cb | 486 | return ret; |
f5ba6c86 CH |
487 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
488 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
489 | if (ret) |
490 | return ret; | |
f5ba6c86 CH |
491 | if (cdev->id.cu_type == 0) |
492 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
493 | ret = online_store_recog_and_online(cdev); |
494 | if (ret) | |
495 | return ret; | |
f5ba6c86 | 496 | } |
c78aa6cb | 497 | return 0; |
f5ba6c86 CH |
498 | } |
499 | ||
500 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
501 | const char *buf, size_t count) | |
1da177e4 LT |
502 | { |
503 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
504 | int force, ret; |
505 | unsigned long i; | |
1da177e4 | 506 | |
a2fc8485 | 507 | /* Prevent conflict between multiple on-/offline processing requests. */ |
350e9120 | 508 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 | 509 | return -EAGAIN; |
a2fc8485 PO |
510 | /* Prevent conflict between internal I/Os and on-/offline processing. */ |
511 | if (!dev_fsm_final_state(cdev) && | |
512 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
513 | ret = -EAGAIN; | |
00381eeb | 514 | goto out; |
a2fc8485 PO |
515 | } |
516 | /* Prevent conflict between pending work and on-/offline processing.*/ | |
517 | if (work_pending(&cdev->private->todo_work)) { | |
518 | ret = -EAGAIN; | |
00381eeb | 519 | goto out; |
1da177e4 LT |
520 | } |
521 | if (!strncmp(buf, "force\n", count)) { | |
522 | force = 1; | |
523 | i = 1; | |
2f972202 | 524 | ret = 0; |
1da177e4 LT |
525 | } else { |
526 | force = 0; | |
0178722b | 527 | ret = kstrtoul(buf, 16, &i); |
1da177e4 | 528 | } |
2f972202 CH |
529 | if (ret) |
530 | goto out; | |
00381eeb SO |
531 | |
532 | device_lock(dev); | |
f5ba6c86 CH |
533 | switch (i) { |
534 | case 0: | |
e74fe0ce | 535 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
536 | break; |
537 | case 1: | |
c78aa6cb | 538 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
539 | break; |
540 | default: | |
2f972202 | 541 | ret = -EINVAL; |
1da177e4 | 542 | } |
00381eeb SO |
543 | device_unlock(dev); |
544 | ||
2f972202 | 545 | out: |
1da177e4 | 546 | atomic_set(&cdev->private->onoff, 0); |
e74fe0ce | 547 | return (ret < 0) ? ret : count; |
1da177e4 LT |
548 | } |
549 | ||
550 | static ssize_t | |
3fd3c0a5 | 551 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
552 | { |
553 | struct ccw_device *cdev = to_ccwdev(dev); | |
554 | struct subchannel *sch; | |
555 | ||
d7b5a4c9 CH |
556 | if (ccw_device_is_orphan(cdev)) |
557 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
558 | switch (cdev->private->state) { |
559 | case DEV_STATE_BOXED: | |
560 | return sprintf(buf, "boxed\n"); | |
561 | case DEV_STATE_DISCONNECTED: | |
562 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
563 | case DEV_STATE_NOT_OPER: | |
564 | sch = to_subchannel(dev->parent); | |
565 | if (!sch->lpm) | |
566 | return sprintf(buf, "no path\n"); | |
567 | else | |
568 | return sprintf(buf, "no device\n"); | |
569 | default: | |
570 | /* All other states considered fine. */ | |
571 | return sprintf(buf, "good\n"); | |
572 | } | |
573 | } | |
574 | ||
fd0457a6 ME |
575 | static ssize_t |
576 | initiate_logging(struct device *dev, struct device_attribute *attr, | |
577 | const char *buf, size_t count) | |
578 | { | |
579 | struct subchannel *sch = to_subchannel(dev); | |
580 | int rc; | |
581 | ||
582 | rc = chsc_siosl(sch->schid); | |
583 | if (rc < 0) { | |
baebc70a JP |
584 | pr_warn("Logging for subchannel 0.%x.%04x failed with errno=%d\n", |
585 | sch->schid.ssid, sch->schid.sch_no, rc); | |
fd0457a6 ME |
586 | return rc; |
587 | } | |
588 | pr_notice("Logging for subchannel 0.%x.%04x was triggered\n", | |
589 | sch->schid.ssid, sch->schid.sch_no); | |
590 | return count; | |
591 | } | |
592 | ||
84c57ad5 SO |
593 | static ssize_t vpm_show(struct device *dev, struct device_attribute *attr, |
594 | char *buf) | |
595 | { | |
596 | struct subchannel *sch = to_subchannel(dev); | |
597 | ||
598 | return sprintf(buf, "%02x\n", sch->vpm); | |
599 | } | |
600 | ||
1da177e4 LT |
601 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); |
602 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 603 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 604 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 | 605 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
fd0457a6 | 606 | static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); |
84c57ad5 | 607 | static DEVICE_ATTR(vpm, 0444, vpm_show, NULL); |
1da177e4 | 608 | |
7e9db9ea | 609 | static struct attribute *io_subchannel_attrs[] = { |
fd0457a6 | 610 | &dev_attr_logging.attr, |
84c57ad5 | 611 | &dev_attr_vpm.attr, |
1da177e4 LT |
612 | NULL, |
613 | }; | |
614 | ||
7e9db9ea CH |
615 | static struct attribute_group io_subchannel_attr_group = { |
616 | .attrs = io_subchannel_attrs, | |
529192f3 | 617 | }; |
1da177e4 LT |
618 | |
619 | static struct attribute * ccwdev_attrs[] = { | |
620 | &dev_attr_devtype.attr, | |
621 | &dev_attr_cutype.attr, | |
f1fc78a8 | 622 | &dev_attr_modalias.attr, |
1da177e4 LT |
623 | &dev_attr_online.attr, |
624 | &dev_attr_cmb_enable.attr, | |
625 | &dev_attr_availability.attr, | |
626 | NULL, | |
627 | }; | |
628 | ||
629 | static struct attribute_group ccwdev_attr_group = { | |
630 | .attrs = ccwdev_attrs, | |
631 | }; | |
632 | ||
a4dbd674 | 633 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
634 | &ccwdev_attr_group, |
635 | NULL, | |
636 | }; | |
1da177e4 | 637 | |
2c3e7e15 | 638 | static int ccw_device_add(struct ccw_device *cdev) |
1da177e4 LT |
639 | { |
640 | struct device *dev = &cdev->dev; | |
1da177e4 LT |
641 | |
642 | dev->bus = &ccw_bus_type; | |
7d253b9a | 643 | return device_add(dev); |
1da177e4 LT |
644 | } |
645 | ||
5d6e6b6f | 646 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 647 | { |
5d6e6b6f PO |
648 | struct ccw_device *cdev = to_ccwdev(dev); |
649 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 650 | |
d7b5a4c9 CH |
651 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
652 | } | |
653 | ||
b7a610f7 SO |
654 | /** |
655 | * get_ccwdev_by_dev_id() - obtain device from a ccw device id | |
656 | * @dev_id: id of the device to be searched | |
657 | * | |
658 | * This function searches all devices attached to the ccw bus for a device | |
659 | * matching @dev_id. | |
660 | * Returns: | |
661 | * If a device is found its reference count is increased and returned; | |
662 | * else %NULL is returned. | |
663 | */ | |
664 | struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) | |
d7b5a4c9 CH |
665 | { |
666 | struct device *dev; | |
667 | ||
5d6e6b6f | 668 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
669 | |
670 | return dev ? to_ccwdev(dev) : NULL; | |
671 | } | |
b7a610f7 | 672 | EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id); |
d7b5a4c9 | 673 | |
37de53bb | 674 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 675 | { |
eb32ae8d | 676 | int ret; |
1da177e4 | 677 | |
7d253b9a | 678 | if (device_is_registered(&cdev->dev)) { |
eb32ae8d CH |
679 | device_release_driver(&cdev->dev); |
680 | ret = device_attach(&cdev->dev); | |
681 | WARN_ON(ret == -ENODEV); | |
682 | } | |
1da177e4 LT |
683 | } |
684 | ||
685 | static void | |
686 | ccw_device_release(struct device *dev) | |
687 | { | |
688 | struct ccw_device *cdev; | |
689 | ||
690 | cdev = to_ccwdev(dev); | |
6eff208f CH |
691 | /* Release reference of parent subchannel. */ |
692 | put_device(cdev->dev.parent); | |
1da177e4 LT |
693 | kfree(cdev->private); |
694 | kfree(cdev); | |
695 | } | |
696 | ||
7674da77 CH |
697 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
698 | { | |
699 | struct ccw_device *cdev; | |
700 | ||
701 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
702 | if (cdev) { | |
703 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
704 | GFP_KERNEL | GFP_DMA); | |
705 | if (cdev->private) | |
706 | return cdev; | |
707 | } | |
708 | kfree(cdev); | |
709 | return ERR_PTR(-ENOMEM); | |
710 | } | |
711 | ||
37de53bb PO |
712 | static void ccw_device_todo(struct work_struct *work); |
713 | ||
7674da77 CH |
714 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
715 | struct ccw_device *cdev) | |
716 | { | |
2c3e7e15 SO |
717 | struct ccw_device_private *priv = cdev->private; |
718 | int ret; | |
719 | ||
720 | priv->cdev = cdev; | |
721 | priv->int_class = IRQIO_CIO; | |
722 | priv->state = DEV_STATE_NOT_OPER; | |
723 | priv->dev_id.devno = sch->schib.pmcw.dev; | |
724 | priv->dev_id.ssid = sch->schid.ssid; | |
2c3e7e15 SO |
725 | |
726 | INIT_WORK(&priv->todo_work, ccw_device_todo); | |
727 | INIT_LIST_HEAD(&priv->cmb_list); | |
728 | init_waitqueue_head(&priv->wait_q); | |
729 | init_timer(&priv->timer); | |
730 | ||
731 | atomic_set(&priv->onoff, 0); | |
732 | cdev->ccwlock = sch->lock; | |
7674da77 CH |
733 | cdev->dev.parent = &sch->dev; |
734 | cdev->dev.release = ccw_device_release; | |
ef99516c | 735 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
736 | /* Do first half of device_register. */ |
737 | device_initialize(&cdev->dev); | |
2c3e7e15 SO |
738 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
739 | cdev->private->dev_id.devno); | |
740 | if (ret) | |
741 | goto out_put; | |
7674da77 | 742 | if (!get_device(&sch->dev)) { |
2c3e7e15 SO |
743 | ret = -ENODEV; |
744 | goto out_put; | |
7674da77 | 745 | } |
2c3e7e15 SO |
746 | priv->flags.initialized = 1; |
747 | spin_lock_irq(sch->lock); | |
748 | sch_set_cdev(sch, cdev); | |
749 | spin_unlock_irq(sch->lock); | |
7674da77 | 750 | return 0; |
2c3e7e15 SO |
751 | |
752 | out_put: | |
753 | /* Release reference from device_initialize(). */ | |
754 | put_device(&cdev->dev); | |
755 | return ret; | |
7674da77 CH |
756 | } |
757 | ||
758 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
759 | { | |
760 | struct ccw_device *cdev; | |
761 | int ret; | |
762 | ||
763 | cdev = io_subchannel_allocate_dev(sch); | |
764 | if (!IS_ERR(cdev)) { | |
765 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 766 | if (ret) |
7674da77 | 767 | cdev = ERR_PTR(ret); |
7674da77 CH |
768 | } |
769 | return cdev; | |
770 | } | |
771 | ||
736b5db8 | 772 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 773 | |
d7b5a4c9 CH |
774 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
775 | { | |
776 | struct ccw_device *cdev; | |
777 | ||
778 | /* Need to allocate a new ccw device. */ | |
779 | cdev = io_subchannel_create_ccwdev(sch); | |
780 | if (IS_ERR(cdev)) { | |
781 | /* OK, we did everything we could... */ | |
782 | css_sch_device_unregister(sch); | |
783 | return; | |
784 | } | |
d7b5a4c9 | 785 | /* Start recognition for the new ccw device. */ |
736b5db8 | 786 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
787 | } |
788 | ||
1da177e4 LT |
789 | /* |
790 | * Register recognized device. | |
791 | */ | |
37de53bb | 792 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 793 | { |
1da177e4 | 794 | struct subchannel *sch; |
a290156f | 795 | int ret, adjust_init_count = 1; |
1da177e4 LT |
796 | unsigned long flags; |
797 | ||
1da177e4 | 798 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
799 | /* |
800 | * Check if subchannel is still registered. It may have become | |
801 | * unregistered if a machine check hit us after finishing | |
802 | * device recognition but before the register work could be | |
803 | * queued. | |
804 | */ | |
805 | if (!device_is_registered(&sch->dev)) | |
806 | goto out_err; | |
82b7ac05 | 807 | css_update_ssd_info(sch); |
47af5518 CH |
808 | /* |
809 | * io_subchannel_register() will also be called after device | |
810 | * recognition has been done for a boxed device (which will already | |
811 | * be registered). We need to reprobe since we may now have sense id | |
812 | * information. | |
813 | */ | |
d6a30761 | 814 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
815 | if (!cdev->drv) { |
816 | ret = device_reprobe(&cdev->dev); | |
817 | if (ret) | |
818 | /* We can't do much here. */ | |
139b83dd | 819 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
820 | " %d for 0.%x.%04x\n", ret, |
821 | cdev->private->dev_id.ssid, | |
822 | cdev->private->dev_id.devno); | |
47af5518 | 823 | } |
a290156f | 824 | adjust_init_count = 0; |
1da177e4 LT |
825 | goto out; |
826 | } | |
fa1a8c23 CH |
827 | /* |
828 | * Now we know this subchannel will stay, we can throw | |
829 | * our delayed uevent. | |
830 | */ | |
f67f129e | 831 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 832 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 | 833 | /* make it known to the system */ |
2c3e7e15 | 834 | ret = ccw_device_add(cdev); |
1da177e4 | 835 | if (ret) { |
e556bbbd CH |
836 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
837 | cdev->private->dev_id.ssid, | |
838 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 839 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 840 | sch_set_cdev(sch, NULL); |
2ec22984 | 841 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
842 | /* Release initial device reference. */ |
843 | put_device(&cdev->dev); | |
5fb6b854 | 844 | goto out_err; |
1da177e4 | 845 | } |
1da177e4 LT |
846 | out: |
847 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 848 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 849 | out_err: |
a290156f | 850 | if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count)) |
1da177e4 LT |
851 | wake_up(&ccw_device_init_wq); |
852 | } | |
853 | ||
37de53bb | 854 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 855 | { |
1da177e4 LT |
856 | struct subchannel *sch; |
857 | ||
46fbe4e4 PO |
858 | /* Get subchannel reference for local processing. */ |
859 | if (!get_device(cdev->dev.parent)) | |
860 | return; | |
1da177e4 | 861 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 862 | css_sch_device_unregister(sch); |
46fbe4e4 | 863 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
864 | put_device(&sch->dev); |
865 | } | |
866 | ||
867 | /* | |
868 | * subchannel recognition done. Called from the state machine. | |
869 | */ | |
870 | void | |
871 | io_subchannel_recog_done(struct ccw_device *cdev) | |
872 | { | |
1da177e4 LT |
873 | if (css_init_done == 0) { |
874 | cdev->private->flags.recog_done = 1; | |
875 | return; | |
876 | } | |
877 | switch (cdev->private->state) { | |
47593bfa SO |
878 | case DEV_STATE_BOXED: |
879 | /* Device did not respond in time. */ | |
1da177e4 LT |
880 | case DEV_STATE_NOT_OPER: |
881 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
882 | /* Remove device found not operational. */ |
883 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
884 | if (atomic_dec_and_test(&ccw_device_init_count)) |
885 | wake_up(&ccw_device_init_wq); | |
886 | break; | |
1da177e4 LT |
887 | case DEV_STATE_OFFLINE: |
888 | /* | |
889 | * We can't register the device in interrupt context so | |
890 | * we schedule a work item. | |
891 | */ | |
37de53bb | 892 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
893 | break; |
894 | } | |
895 | } | |
896 | ||
736b5db8 | 897 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 898 | { |
1da177e4 LT |
899 | /* Increase counter of devices currently in recognition. */ |
900 | atomic_inc(&ccw_device_init_count); | |
901 | ||
902 | /* Start async. device sensing. */ | |
2ec22984 | 903 | spin_lock_irq(sch->lock); |
736b5db8 | 904 | ccw_device_recognition(cdev); |
2ec22984 | 905 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
906 | } |
907 | ||
5d6e6b6f PO |
908 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
909 | struct subchannel *sch) | |
d7b5a4c9 | 910 | { |
5d6e6b6f | 911 | struct subchannel *old_sch; |
0c609fca | 912 | int rc, old_enabled = 0; |
d7b5a4c9 | 913 | |
5d6e6b6f PO |
914 | old_sch = to_subchannel(cdev->dev.parent); |
915 | /* Obtain child reference for new parent. */ | |
6eff208f | 916 | if (!get_device(&sch->dev)) |
5d6e6b6f | 917 | return -ENODEV; |
0c609fca SO |
918 | |
919 | if (!sch_is_pseudo_sch(old_sch)) { | |
920 | spin_lock_irq(old_sch->lock); | |
921 | old_enabled = old_sch->schib.pmcw.ena; | |
922 | rc = 0; | |
923 | if (old_enabled) | |
924 | rc = cio_disable_subchannel(old_sch); | |
925 | spin_unlock_irq(old_sch->lock); | |
926 | if (rc == -EBUSY) { | |
927 | /* Release child reference for new parent. */ | |
928 | put_device(&sch->dev); | |
929 | return rc; | |
930 | } | |
931 | } | |
932 | ||
d7b5a4c9 | 933 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 934 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
935 | mutex_unlock(&sch->reg_mutex); |
936 | if (rc) { | |
5d6e6b6f | 937 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
938 | cdev->private->dev_id.ssid, |
939 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f | 940 | sch->schib.pmcw.dev, rc); |
0c609fca SO |
941 | if (old_enabled) { |
942 | /* Try to reenable the old subchannel. */ | |
943 | spin_lock_irq(old_sch->lock); | |
944 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
945 | spin_unlock_irq(old_sch->lock); | |
946 | } | |
5d6e6b6f | 947 | /* Release child reference for new parent. */ |
6eff208f | 948 | put_device(&sch->dev); |
5d6e6b6f | 949 | return rc; |
d7b5a4c9 | 950 | } |
5d6e6b6f PO |
951 | /* Clean up old subchannel. */ |
952 | if (!sch_is_pseudo_sch(old_sch)) { | |
953 | spin_lock_irq(old_sch->lock); | |
954 | sch_set_cdev(old_sch, NULL); | |
5d6e6b6f PO |
955 | spin_unlock_irq(old_sch->lock); |
956 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 957 | } |
5d6e6b6f PO |
958 | /* Release child reference for old parent. */ |
959 | put_device(&old_sch->dev); | |
960 | /* Initialize new subchannel. */ | |
961 | spin_lock_irq(sch->lock); | |
5d6e6b6f PO |
962 | cdev->ccwlock = sch->lock; |
963 | if (!sch_is_pseudo_sch(sch)) | |
964 | sch_set_cdev(sch, cdev); | |
965 | spin_unlock_irq(sch->lock); | |
966 | if (!sch_is_pseudo_sch(sch)) | |
967 | css_update_ssd_info(sch); | |
968 | return 0; | |
969 | } | |
970 | ||
971 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
972 | { | |
973 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
974 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
975 | ||
976 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
977 | } |
978 | ||
602b20f2 CH |
979 | static void io_subchannel_irq(struct subchannel *sch) |
980 | { | |
981 | struct ccw_device *cdev; | |
982 | ||
db6a6423 | 983 | cdev = sch_get_cdev(sch); |
602b20f2 | 984 | |
efd986db SO |
985 | CIO_TRACE_EVENT(6, "IRQ"); |
986 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
987 | if (cdev) |
988 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
de400d6b | 989 | else |
420f42ec | 990 | inc_irq_stat(IRQIO_CIO); |
602b20f2 CH |
991 | } |
992 | ||
13952ec1 SO |
993 | void io_subchannel_init_config(struct subchannel *sch) |
994 | { | |
995 | memset(&sch->config, 0, sizeof(sch->config)); | |
996 | sch->config.csense = 1; | |
13952ec1 SO |
997 | } |
998 | ||
0ae7a7b2 CH |
999 | static void io_subchannel_init_fields(struct subchannel *sch) |
1000 | { | |
1001 | if (cio_is_console(sch->schid)) | |
1002 | sch->opm = 0xff; | |
1003 | else | |
1004 | sch->opm = chp_get_sch_opm(sch); | |
1005 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1006 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1007 | |
1008 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1009 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1010 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1011 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1012 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1013 | |
1014 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1015 | } |
1016 | ||
90ed2b69 CH |
1017 | /* |
1018 | * Note: We always return 0 so that we bind to the device even on error. | |
1019 | * This is needed so that our remove function is called on unregister. | |
1020 | */ | |
0ae7a7b2 | 1021 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1022 | { |
f92519e8 | 1023 | struct io_subchannel_private *io_priv; |
1da177e4 LT |
1024 | struct ccw_device *cdev; |
1025 | int rc; | |
1da177e4 | 1026 | |
6d7c5afc | 1027 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1028 | rc = sysfs_create_group(&sch->dev.kobj, |
1029 | &io_subchannel_attr_group); | |
1030 | if (rc) | |
1031 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1032 | "attributes for subchannel " | |
1033 | "0.%x.%04x (rc=%d)\n", | |
1034 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1035 | /* |
6d7c5afc | 1036 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1037 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1038 | * the ccw_device and exit. |
1da177e4 | 1039 | */ |
f67f129e | 1040 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1041 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1042 | cdev = sch_get_cdev(sch); |
2c3e7e15 | 1043 | rc = ccw_device_add(cdev); |
afdfed0f SO |
1044 | if (rc) { |
1045 | /* Release online reference. */ | |
1046 | put_device(&cdev->dev); | |
1047 | goto out_schedule; | |
1048 | } | |
0ad8f714 SO |
1049 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1050 | wake_up(&ccw_device_init_wq); | |
1da177e4 LT |
1051 | return 0; |
1052 | } | |
0ae7a7b2 | 1053 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1054 | rc = cio_commit_config(sch); |
1055 | if (rc) | |
1056 | goto out_schedule; | |
7e9db9ea CH |
1057 | rc = sysfs_create_group(&sch->dev.kobj, |
1058 | &io_subchannel_attr_group); | |
1059 | if (rc) | |
90ed2b69 | 1060 | goto out_schedule; |
cd6b4f27 | 1061 | /* Allocate I/O subchannel private data. */ |
f92519e8 SO |
1062 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); |
1063 | if (!io_priv) | |
48e4c385 | 1064 | goto out_schedule; |
f92519e8 SO |
1065 | |
1066 | set_io_private(sch, io_priv); | |
5d6e6b6f | 1067 | css_schedule_eval(sch->schid); |
7e9db9ea | 1068 | return 0; |
48e4c385 | 1069 | |
90ed2b69 | 1070 | out_schedule: |
390935ac PO |
1071 | spin_lock_irq(sch->lock); |
1072 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1073 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1074 | return 0; |
1da177e4 LT |
1075 | } |
1076 | ||
1da177e4 | 1077 | static int |
8bbace7e | 1078 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 | 1079 | { |
f92519e8 | 1080 | struct io_subchannel_private *io_priv = to_io_private(sch); |
1da177e4 | 1081 | struct ccw_device *cdev; |
1da177e4 | 1082 | |
db6a6423 CH |
1083 | cdev = sch_get_cdev(sch); |
1084 | if (!cdev) | |
48e4c385 | 1085 | goto out_free; |
6e9a0f67 | 1086 | io_subchannel_quiesce(sch); |
1da177e4 | 1087 | /* Set ccw device to not operational and drop reference. */ |
7a8ad100 | 1088 | spin_lock_irq(cdev->ccwlock); |
db6a6423 | 1089 | sch_set_cdev(sch, NULL); |
f92519e8 | 1090 | set_io_private(sch, NULL); |
1da177e4 | 1091 | cdev->private->state = DEV_STATE_NOT_OPER; |
7a8ad100 | 1092 | spin_unlock_irq(cdev->ccwlock); |
ef99516c | 1093 | ccw_device_unregister(cdev); |
48e4c385 | 1094 | out_free: |
f92519e8 | 1095 | kfree(io_priv); |
7e9db9ea | 1096 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1097 | return 0; |
1098 | } | |
1099 | ||
602b20f2 | 1100 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1101 | { |
1102 | struct ccw_device *cdev; | |
1103 | ||
db6a6423 | 1104 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1105 | if (cdev) |
1106 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1107 | } | |
1108 | ||
c820de39 CH |
1109 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1110 | { | |
1111 | struct ccw_device *cdev; | |
1112 | ||
1113 | cdev = sch_get_cdev(sch); | |
1114 | if (!cdev) | |
1115 | return; | |
4257aaec PO |
1116 | if (cio_update_schib(sch)) |
1117 | goto err; | |
1118 | /* Check for I/O on path. */ | |
1119 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1120 | goto out; | |
1121 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1122 | ccw_device_kill_io(cdev); | |
1123 | goto out; | |
1124 | } | |
1125 | if (cio_clear(sch)) | |
1126 | goto err; | |
1127 | out: | |
1128 | /* Trigger path verification. */ | |
1129 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1130 | return; | |
c820de39 | 1131 | |
4257aaec PO |
1132 | err: |
1133 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1134 | } |
1135 | ||
99611f87 CH |
1136 | static int io_subchannel_chp_event(struct subchannel *sch, |
1137 | struct chp_link *link, int event) | |
c820de39 | 1138 | { |
585b954e | 1139 | struct ccw_device *cdev = sch_get_cdev(sch); |
c820de39 | 1140 | int mask; |
c820de39 | 1141 | |
99611f87 | 1142 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1143 | if (!mask) |
1144 | return 0; | |
1145 | switch (event) { | |
1146 | case CHP_VARY_OFF: | |
1147 | sch->opm &= ~mask; | |
1148 | sch->lpm &= ~mask; | |
585b954e SO |
1149 | if (cdev) |
1150 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1151 | io_subchannel_terminate_path(sch, mask); |
1152 | break; | |
1153 | case CHP_VARY_ON: | |
1154 | sch->opm |= mask; | |
1155 | sch->lpm |= mask; | |
585b954e SO |
1156 | if (cdev) |
1157 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1158 | io_subchannel_verify(sch); |
1159 | break; | |
1160 | case CHP_OFFLINE: | |
cdb912a4 | 1161 | if (cio_update_schib(sch)) |
c820de39 | 1162 | return -ENODEV; |
585b954e SO |
1163 | if (cdev) |
1164 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1165 | io_subchannel_terminate_path(sch, mask); |
1166 | break; | |
1167 | case CHP_ONLINE: | |
cdb912a4 SO |
1168 | if (cio_update_schib(sch)) |
1169 | return -ENODEV; | |
c820de39 | 1170 | sch->lpm |= mask & sch->opm; |
585b954e SO |
1171 | if (cdev) |
1172 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1173 | io_subchannel_verify(sch); |
1174 | break; | |
1175 | } | |
1176 | return 0; | |
1177 | } | |
1178 | ||
6e9a0f67 | 1179 | static void io_subchannel_quiesce(struct subchannel *sch) |
1da177e4 | 1180 | { |
1da177e4 LT |
1181 | struct ccw_device *cdev; |
1182 | int ret; | |
1183 | ||
56e6b796 | 1184 | spin_lock_irq(sch->lock); |
db6a6423 | 1185 | cdev = sch_get_cdev(sch); |
a8237fc4 | 1186 | if (cio_is_console(sch->schid)) |
56e6b796 | 1187 | goto out_unlock; |
1da177e4 | 1188 | if (!sch->schib.pmcw.ena) |
56e6b796 | 1189 | goto out_unlock; |
1da177e4 LT |
1190 | ret = cio_disable_subchannel(sch); |
1191 | if (ret != -EBUSY) | |
56e6b796 | 1192 | goto out_unlock; |
1da177e4 | 1193 | if (cdev->handler) |
56e6b796 SO |
1194 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); |
1195 | while (ret == -EBUSY) { | |
1196 | cdev->private->state = DEV_STATE_QUIESCE; | |
376ae475 | 1197 | cdev->private->iretry = 255; |
56e6b796 SO |
1198 | ret = ccw_device_cancel_halt_clear(cdev); |
1199 | if (ret == -EBUSY) { | |
1200 | ccw_device_set_timeout(cdev, HZ/10); | |
1201 | spin_unlock_irq(sch->lock); | |
1202 | wait_event(cdev->private->wait_q, | |
1203 | cdev->private->state != DEV_STATE_QUIESCE); | |
1204 | spin_lock_irq(sch->lock); | |
1205 | } | |
1206 | ret = cio_disable_subchannel(sch); | |
1da177e4 | 1207 | } |
56e6b796 SO |
1208 | out_unlock: |
1209 | spin_unlock_irq(sch->lock); | |
1da177e4 LT |
1210 | } |
1211 | ||
6e9a0f67 SO |
1212 | static void io_subchannel_shutdown(struct subchannel *sch) |
1213 | { | |
1214 | io_subchannel_quiesce(sch); | |
1215 | } | |
1216 | ||
c820de39 CH |
1217 | static int device_is_disconnected(struct ccw_device *cdev) |
1218 | { | |
1219 | if (!cdev) | |
1220 | return 0; | |
1221 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1222 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1223 | } | |
1224 | ||
1225 | static int recovery_check(struct device *dev, void *data) | |
1226 | { | |
1227 | struct ccw_device *cdev = to_ccwdev(dev); | |
1228 | int *redo = data; | |
1229 | ||
1230 | spin_lock_irq(cdev->ccwlock); | |
1231 | switch (cdev->private->state) { | |
1232 | case DEV_STATE_DISCONNECTED: | |
1233 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1234 | cdev->private->dev_id.ssid, | |
1235 | cdev->private->dev_id.devno); | |
1236 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1237 | *redo = 1; | |
1238 | break; | |
1239 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1240 | *redo = 1; | |
1241 | break; | |
1242 | } | |
1243 | spin_unlock_irq(cdev->ccwlock); | |
1244 | ||
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | static void recovery_work_func(struct work_struct *unused) | |
1249 | { | |
1250 | int redo = 0; | |
1251 | ||
1252 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1253 | if (redo) { | |
1254 | spin_lock_irq(&recovery_lock); | |
1255 | if (!timer_pending(&recovery_timer)) { | |
1256 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1257 | recovery_phase++; | |
1258 | mod_timer(&recovery_timer, jiffies + | |
1259 | recovery_delay[recovery_phase] * HZ); | |
1260 | } | |
1261 | spin_unlock_irq(&recovery_lock); | |
1262 | } else | |
1263 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1264 | } | |
1265 | ||
1266 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1267 | ||
1268 | static void recovery_func(unsigned long data) | |
1269 | { | |
1270 | /* | |
1271 | * We can't do our recovery in softirq context and it's not | |
1272 | * performance critical, so we schedule it. | |
1273 | */ | |
1274 | schedule_work(&recovery_work); | |
1275 | } | |
1276 | ||
1277 | static void ccw_device_schedule_recovery(void) | |
1278 | { | |
1279 | unsigned long flags; | |
1280 | ||
1281 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1282 | spin_lock_irqsave(&recovery_lock, flags); | |
1283 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1284 | recovery_phase = 0; | |
1285 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1286 | } | |
1287 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1288 | } | |
1289 | ||
ecf5d9ef PO |
1290 | static int purge_fn(struct device *dev, void *data) |
1291 | { | |
1292 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1293 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1294 | |
1295 | spin_lock_irq(cdev->ccwlock); | |
37de53bb | 1296 | if (is_blacklisted(id->ssid, id->devno) && |
a2fc8485 PO |
1297 | (cdev->private->state == DEV_STATE_OFFLINE) && |
1298 | (atomic_cmpxchg(&cdev->private->onoff, 0, 1) == 0)) { | |
37de53bb PO |
1299 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, |
1300 | id->devno); | |
1301 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
a2fc8485 | 1302 | atomic_set(&cdev->private->onoff, 0); |
37de53bb | 1303 | } |
ecf5d9ef | 1304 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1305 | /* Abort loop in case of pending signal. */ |
1306 | if (signal_pending(current)) | |
1307 | return -EINTR; | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | /** | |
1313 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1314 | * | |
1315 | * Unregister all ccw devices that are offline and on the blacklist. | |
1316 | */ | |
1317 | int ccw_purge_blacklisted(void) | |
1318 | { | |
1319 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1320 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1321 | return 0; | |
1322 | } | |
1323 | ||
6afcc775 | 1324 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1325 | { |
1326 | if (!cdev) | |
1327 | return; | |
1328 | ccw_device_set_timeout(cdev, 0); | |
1329 | cdev->private->flags.fake_irb = 0; | |
1330 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1331 | if (cdev->online) | |
1332 | ccw_device_schedule_recovery(); | |
1333 | } | |
1334 | ||
91c36919 PO |
1335 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1336 | { | |
1337 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1338 | ||
1339 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1340 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1341 | ccw_device_set_timeout(cdev, 0); |
1342 | cio_disable_subchannel(sch); | |
1343 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1344 | } | |
1345 | ||
5d6e6b6f PO |
1346 | enum io_sch_action { |
1347 | IO_SCH_UNREG, | |
1348 | IO_SCH_ORPH_UNREG, | |
1349 | IO_SCH_ATTACH, | |
1350 | IO_SCH_UNREG_ATTACH, | |
1351 | IO_SCH_ORPH_ATTACH, | |
1352 | IO_SCH_REPROBE, | |
1353 | IO_SCH_VERIFY, | |
1354 | IO_SCH_DISC, | |
1355 | IO_SCH_NOP, | |
1356 | }; | |
1357 | ||
1358 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1359 | { | |
1360 | struct ccw_device *cdev; | |
1361 | ||
1362 | cdev = sch_get_cdev(sch); | |
1363 | if (cio_update_schib(sch)) { | |
1364 | /* Not operational. */ | |
1365 | if (!cdev) | |
1366 | return IO_SCH_UNREG; | |
76e6fb4b | 1367 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1368 | return IO_SCH_UNREG; |
1369 | return IO_SCH_ORPH_UNREG; | |
1370 | } | |
1371 | /* Operational. */ | |
1372 | if (!cdev) | |
1373 | return IO_SCH_ATTACH; | |
1374 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
76e6fb4b | 1375 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1376 | return IO_SCH_UNREG_ATTACH; |
1377 | return IO_SCH_ORPH_ATTACH; | |
1378 | } | |
1379 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
76e6fb4b | 1380 | if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) |
5d6e6b6f PO |
1381 | return IO_SCH_UNREG; |
1382 | return IO_SCH_DISC; | |
1383 | } | |
1384 | if (device_is_disconnected(cdev)) | |
1385 | return IO_SCH_REPROBE; | |
31370f75 | 1386 | if (cdev->online && !cdev->private->flags.resuming) |
5d6e6b6f | 1387 | return IO_SCH_VERIFY; |
43d0be75 SO |
1388 | if (cdev->private->state == DEV_STATE_NOT_OPER) |
1389 | return IO_SCH_UNREG_ATTACH; | |
5d6e6b6f PO |
1390 | return IO_SCH_NOP; |
1391 | } | |
1392 | ||
1393 | /** | |
1394 | * io_subchannel_sch_event - process subchannel event | |
1395 | * @sch: subchannel | |
1396 | * @process: non-zero if function is called in process context | |
1397 | * | |
1398 | * An unspecified event occurred for this subchannel. Adjust data according | |
1399 | * to the current operational state of the subchannel and device. Return | |
1400 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1401 | * function should be called again in process context. | |
1402 | */ | |
1403 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1404 | { |
c820de39 | 1405 | unsigned long flags; |
c820de39 | 1406 | struct ccw_device *cdev; |
5d6e6b6f PO |
1407 | struct ccw_dev_id dev_id; |
1408 | enum io_sch_action action; | |
1409 | int rc = -EAGAIN; | |
c820de39 CH |
1410 | |
1411 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1412 | if (!device_is_registered(&sch->dev)) |
1413 | goto out_unlock; | |
390935ac PO |
1414 | if (work_pending(&sch->todo_work)) |
1415 | goto out_unlock; | |
37de53bb PO |
1416 | cdev = sch_get_cdev(sch); |
1417 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1418 | goto out_unlock; | |
5d6e6b6f PO |
1419 | action = sch_get_action(sch); |
1420 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1421 | sch->schid.ssid, sch->schid.sch_no, process, | |
1422 | action); | |
1423 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1424 | switch (action) { |
1425 | case IO_SCH_REPROBE: | |
1426 | /* Trigger device recognition. */ | |
1427 | ccw_device_trigger_reprobe(cdev); | |
1428 | rc = 0; | |
1429 | goto out_unlock; | |
1430 | case IO_SCH_VERIFY: | |
1431 | /* Trigger path verification. */ | |
1432 | io_subchannel_verify(sch); | |
1433 | rc = 0; | |
1434 | goto out_unlock; | |
1435 | case IO_SCH_DISC: | |
1436 | ccw_device_set_disconnected(cdev); | |
1437 | rc = 0; | |
1438 | goto out_unlock; | |
1439 | case IO_SCH_ORPH_UNREG: | |
1440 | case IO_SCH_ORPH_ATTACH: | |
1441 | ccw_device_set_disconnected(cdev); | |
1442 | break; | |
1443 | case IO_SCH_UNREG_ATTACH: | |
1444 | case IO_SCH_UNREG: | |
16d2ce27 SO |
1445 | if (!cdev) |
1446 | break; | |
1447 | if (cdev->private->state == DEV_STATE_SENSE_ID) { | |
1448 | /* | |
1449 | * Note: delayed work triggered by this event | |
1450 | * and repeated calls to sch_event are synchronized | |
1451 | * by the above check for work_pending(cdev). | |
1452 | */ | |
1453 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1454 | } else | |
5d6e6b6f PO |
1455 | ccw_device_set_notoper(cdev); |
1456 | break; | |
1457 | case IO_SCH_NOP: | |
1458 | rc = 0; | |
1459 | goto out_unlock; | |
1460 | default: | |
1461 | break; | |
c820de39 | 1462 | } |
5d6e6b6f PO |
1463 | spin_unlock_irqrestore(sch->lock, flags); |
1464 | /* All other actions require process context. */ | |
1465 | if (!process) | |
1466 | goto out; | |
1467 | /* Handle attached ccw device. */ | |
1468 | switch (action) { | |
1469 | case IO_SCH_ORPH_UNREG: | |
1470 | case IO_SCH_ORPH_ATTACH: | |
1471 | /* Move ccw device to orphanage. */ | |
1472 | rc = ccw_device_move_to_orph(cdev); | |
1473 | if (rc) | |
1474 | goto out; | |
c820de39 | 1475 | break; |
5d6e6b6f | 1476 | case IO_SCH_UNREG_ATTACH: |
3368ba25 | 1477 | spin_lock_irqsave(sch->lock, flags); |
74b6127e SO |
1478 | if (cdev->private->flags.resuming) { |
1479 | /* Device will be handled later. */ | |
1480 | rc = 0; | |
3368ba25 | 1481 | goto out_unlock; |
74b6127e | 1482 | } |
3368ba25 SO |
1483 | sch_set_cdev(sch, NULL); |
1484 | spin_unlock_irqrestore(sch->lock, flags); | |
5d6e6b6f | 1485 | /* Unregister ccw device. */ |
74b6127e | 1486 | ccw_device_unregister(cdev); |
c820de39 | 1487 | break; |
5d6e6b6f | 1488 | default: |
c820de39 CH |
1489 | break; |
1490 | } | |
5d6e6b6f | 1491 | /* Handle subchannel. */ |
c820de39 | 1492 | switch (action) { |
5d6e6b6f PO |
1493 | case IO_SCH_ORPH_UNREG: |
1494 | case IO_SCH_UNREG: | |
0d01bb89 SO |
1495 | if (!cdev || !cdev->private->flags.resuming) |
1496 | css_sch_device_unregister(sch); | |
c820de39 | 1497 | break; |
5d6e6b6f PO |
1498 | case IO_SCH_ORPH_ATTACH: |
1499 | case IO_SCH_UNREG_ATTACH: | |
1500 | case IO_SCH_ATTACH: | |
1501 | dev_id.ssid = sch->schid.ssid; | |
1502 | dev_id.devno = sch->schib.pmcw.dev; | |
1503 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1504 | if (!cdev) { | |
1505 | sch_create_and_recog_new_device(sch); | |
1506 | break; | |
1507 | } | |
1508 | rc = ccw_device_move_to_sch(cdev, sch); | |
1509 | if (rc) { | |
1510 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1511 | put_device(&cdev->dev); | |
1512 | goto out; | |
1513 | } | |
1514 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1515 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1516 | spin_unlock_irqrestore(sch->lock, flags); |
1517 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1518 | put_device(&cdev->dev); | |
91c36919 | 1519 | break; |
c820de39 CH |
1520 | default: |
1521 | break; | |
1522 | } | |
5d6e6b6f | 1523 | return 0; |
c820de39 | 1524 | |
5d6e6b6f PO |
1525 | out_unlock: |
1526 | spin_unlock_irqrestore(sch->lock, flags); | |
1527 | out: | |
1528 | return rc; | |
c820de39 CH |
1529 | } |
1530 | ||
137a14f4 SO |
1531 | static void ccw_device_set_int_class(struct ccw_device *cdev) |
1532 | { | |
1533 | struct ccw_driver *cdrv = cdev->drv; | |
1534 | ||
1535 | /* Note: we interpret class 0 in this context as an uninitialized | |
1536 | * field since it translates to a non-I/O interrupt class. */ | |
1537 | if (cdrv->int_class != 0) | |
1538 | cdev->private->int_class = cdrv->int_class; | |
1539 | else | |
1540 | cdev->private->int_class = IRQIO_CIO; | |
1541 | } | |
1542 | ||
1da177e4 | 1543 | #ifdef CONFIG_CCW_CONSOLE |
1e532096 | 1544 | int __init ccw_device_enable_console(struct ccw_device *cdev) |
1da177e4 | 1545 | { |
1e532096 | 1546 | struct subchannel *sch = to_subchannel(cdev->dev.parent); |
1da177e4 LT |
1547 | int rc; |
1548 | ||
1e532096 SO |
1549 | if (!cdev->drv || !cdev->handler) |
1550 | return -EINVAL; | |
1551 | ||
0ae7a7b2 | 1552 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1553 | rc = cio_commit_config(sch); |
1554 | if (rc) | |
1555 | return rc; | |
0ae7a7b2 | 1556 | sch->driver = &io_subchannel_driver; |
736b5db8 | 1557 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1558 | /* Now wait for the async. recognition to come to an end. */ |
1559 | spin_lock_irq(cdev->ccwlock); | |
1560 | while (!dev_fsm_final_state(cdev)) | |
188561a4 SO |
1561 | ccw_device_wait_idle(cdev); |
1562 | ||
afdfed0f SO |
1563 | /* Hold on to an extra reference while device is online. */ |
1564 | get_device(&cdev->dev); | |
1565 | rc = ccw_device_online(cdev); | |
1566 | if (rc) | |
1da177e4 | 1567 | goto out_unlock; |
afdfed0f | 1568 | |
1da177e4 | 1569 | while (!dev_fsm_final_state(cdev)) |
188561a4 SO |
1570 | ccw_device_wait_idle(cdev); |
1571 | ||
afdfed0f SO |
1572 | if (cdev->private->state == DEV_STATE_ONLINE) |
1573 | cdev->online = 1; | |
1574 | else | |
1575 | rc = -EIO; | |
1da177e4 LT |
1576 | out_unlock: |
1577 | spin_unlock_irq(cdev->ccwlock); | |
afdfed0f SO |
1578 | if (rc) /* Give up online reference since onlining failed. */ |
1579 | put_device(&cdev->dev); | |
736b5db8 | 1580 | return rc; |
1da177e4 LT |
1581 | } |
1582 | ||
1e532096 | 1583 | struct ccw_device * __init ccw_device_create_console(struct ccw_driver *drv) |
1da177e4 | 1584 | { |
863fc849 | 1585 | struct io_subchannel_private *io_priv; |
afdfed0f | 1586 | struct ccw_device *cdev; |
1da177e4 | 1587 | struct subchannel *sch; |
1da177e4 | 1588 | |
1da177e4 | 1589 | sch = cio_probe_console(); |
afdfed0f SO |
1590 | if (IS_ERR(sch)) |
1591 | return ERR_CAST(sch); | |
863fc849 SO |
1592 | |
1593 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); | |
1594 | if (!io_priv) { | |
1595 | put_device(&sch->dev); | |
1596 | return ERR_PTR(-ENOMEM); | |
1597 | } | |
2c3e7e15 | 1598 | set_io_private(sch, io_priv); |
afdfed0f SO |
1599 | cdev = io_subchannel_create_ccwdev(sch); |
1600 | if (IS_ERR(cdev)) { | |
1601 | put_device(&sch->dev); | |
1602 | kfree(io_priv); | |
1603 | return cdev; | |
1604 | } | |
2253e8d7 | 1605 | cdev->drv = drv; |
137a14f4 | 1606 | ccw_device_set_int_class(cdev); |
afdfed0f | 1607 | return cdev; |
1da177e4 | 1608 | } |
1f4e7eda | 1609 | |
1e532096 SO |
1610 | void __init ccw_device_destroy_console(struct ccw_device *cdev) |
1611 | { | |
1612 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1613 | struct io_subchannel_private *io_priv = to_io_private(sch); | |
1614 | ||
1615 | set_io_private(sch, NULL); | |
1616 | put_device(&sch->dev); | |
1617 | put_device(&cdev->dev); | |
1618 | kfree(io_priv); | |
1619 | } | |
1620 | ||
188561a4 SO |
1621 | /** |
1622 | * ccw_device_wait_idle() - busy wait for device to become idle | |
1623 | * @cdev: ccw device | |
1624 | * | |
1625 | * Poll until activity control is zero, that is, no function or data | |
1626 | * transfer is pending/active. | |
1627 | * Called with device lock being held. | |
1628 | */ | |
1629 | void ccw_device_wait_idle(struct ccw_device *cdev) | |
1630 | { | |
1631 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1632 | ||
1633 | while (1) { | |
1634 | cio_tsch(sch); | |
1635 | if (sch->schib.scsw.cmd.actl == 0) | |
1636 | break; | |
1637 | udelay_simple(100); | |
1638 | } | |
1639 | } | |
1640 | ||
6664845c MS |
1641 | static int ccw_device_pm_restore(struct device *dev); |
1642 | ||
f10ccca7 | 1643 | int ccw_device_force_console(struct ccw_device *cdev) |
6664845c | 1644 | { |
f10ccca7 | 1645 | return ccw_device_pm_restore(&cdev->dev); |
6664845c MS |
1646 | } |
1647 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1648 | #endif |
1649 | ||
1650 | /* | |
1651 | * get ccw_device matching the busid, but only if owned by cdrv | |
1652 | */ | |
b0744bd2 CH |
1653 | static int |
1654 | __ccwdev_check_busid(struct device *dev, void *id) | |
1655 | { | |
1656 | char *bus_id; | |
1657 | ||
12975aef | 1658 | bus_id = id; |
b0744bd2 | 1659 | |
98df67b3 | 1660 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1661 | } |
1662 | ||
1663 | ||
b2ffd8e9 CH |
1664 | /** |
1665 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1666 | * @cdrv: driver the device is owned by | |
1667 | * @bus_id: bus id of the device to be searched | |
1668 | * | |
1669 | * This function searches all devices owned by @cdrv for a device with a bus | |
1670 | * id matching @bus_id. | |
1671 | * Returns: | |
1672 | * If a match is found, its reference count of the found device is increased | |
1673 | * and it is returned; else %NULL is returned. | |
1674 | */ | |
1675 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1676 | const char *bus_id) | |
1da177e4 | 1677 | { |
b0744bd2 | 1678 | struct device *dev; |
1da177e4 | 1679 | |
9f30ea95 | 1680 | dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id, |
b0744bd2 | 1681 | __ccwdev_check_busid); |
1da177e4 | 1682 | |
d2c993d8 | 1683 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1684 | } |
1685 | ||
1686 | /************************** device driver handling ************************/ | |
1687 | ||
1688 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1689 | * and release methods are initially very similar to the device_driver | |
1690 | * implementations, with the difference that they have ccw_device | |
1691 | * arguments. | |
1692 | * | |
1693 | * A ccw driver also contains the information that is needed for | |
1694 | * device matching. | |
1695 | */ | |
1696 | static int | |
1697 | ccw_device_probe (struct device *dev) | |
1698 | { | |
1699 | struct ccw_device *cdev = to_ccwdev(dev); | |
1700 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1701 | int ret; | |
1702 | ||
1703 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
137a14f4 | 1704 | ccw_device_set_int_class(cdev); |
1da177e4 | 1705 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; |
1da177e4 | 1706 | if (ret) { |
d2c993d8 | 1707 | cdev->drv = NULL; |
420f42ec | 1708 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1709 | return ret; |
1710 | } | |
1711 | ||
1712 | return 0; | |
1713 | } | |
1714 | ||
74bd0d85 | 1715 | static int ccw_device_remove(struct device *dev) |
1da177e4 LT |
1716 | { |
1717 | struct ccw_device *cdev = to_ccwdev(dev); | |
1718 | struct ccw_driver *cdrv = cdev->drv; | |
1719 | int ret; | |
1720 | ||
1da177e4 LT |
1721 | if (cdrv->remove) |
1722 | cdrv->remove(cdev); | |
74bd0d85 SO |
1723 | |
1724 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 LT |
1725 | if (cdev->online) { |
1726 | cdev->online = 0; | |
1da177e4 LT |
1727 | ret = ccw_device_offline(cdev); |
1728 | spin_unlock_irq(cdev->ccwlock); | |
1729 | if (ret == 0) | |
1730 | wait_event(cdev->private->wait_q, | |
1731 | dev_fsm_final_state(cdev)); | |
1732 | else | |
139b83dd | 1733 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1734 | "device 0.%x.%04x\n", |
1735 | ret, cdev->private->dev_id.ssid, | |
1736 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1737 | /* Give up reference obtained in ccw_device_set_online(). */ |
1738 | put_device(&cdev->dev); | |
74bd0d85 | 1739 | spin_lock_irq(cdev->ccwlock); |
1da177e4 LT |
1740 | } |
1741 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1742 | cdev->drv = NULL; |
420f42ec | 1743 | cdev->private->int_class = IRQIO_CIO; |
74bd0d85 | 1744 | spin_unlock_irq(cdev->ccwlock); |
a6ef1565 SO |
1745 | __disable_cmf(cdev); |
1746 | ||
1da177e4 LT |
1747 | return 0; |
1748 | } | |
1749 | ||
958974fb CH |
1750 | static void ccw_device_shutdown(struct device *dev) |
1751 | { | |
1752 | struct ccw_device *cdev; | |
1753 | ||
1754 | cdev = to_ccwdev(dev); | |
1755 | if (cdev->drv && cdev->drv->shutdown) | |
1756 | cdev->drv->shutdown(cdev); | |
1bc6664b | 1757 | __disable_cmf(cdev); |
958974fb CH |
1758 | } |
1759 | ||
823d494a SO |
1760 | static int ccw_device_pm_prepare(struct device *dev) |
1761 | { | |
1762 | struct ccw_device *cdev = to_ccwdev(dev); | |
1763 | ||
37de53bb | 1764 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1765 | return -EAGAIN; |
1766 | /* Fail while device is being set online/offline. */ | |
1767 | if (atomic_read(&cdev->private->onoff)) | |
1768 | return -EAGAIN; | |
1769 | ||
1770 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1771 | return cdev->drv->prepare(cdev); | |
1772 | ||
1773 | return 0; | |
1774 | } | |
1775 | ||
1776 | static void ccw_device_pm_complete(struct device *dev) | |
1777 | { | |
1778 | struct ccw_device *cdev = to_ccwdev(dev); | |
1779 | ||
1780 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1781 | cdev->drv->complete(cdev); | |
1782 | } | |
1783 | ||
1784 | static int ccw_device_pm_freeze(struct device *dev) | |
1785 | { | |
1786 | struct ccw_device *cdev = to_ccwdev(dev); | |
1787 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1788 | int ret, cm_enabled; | |
1789 | ||
1790 | /* Fail suspend while device is in transistional state. */ | |
1791 | if (!dev_fsm_final_state(cdev)) | |
1792 | return -EAGAIN; | |
1793 | if (!cdev->online) | |
1794 | return 0; | |
1795 | if (cdev->drv && cdev->drv->freeze) { | |
1796 | ret = cdev->drv->freeze(cdev); | |
1797 | if (ret) | |
1798 | return ret; | |
1799 | } | |
1800 | ||
1801 | spin_lock_irq(sch->lock); | |
1802 | cm_enabled = cdev->private->cmb != NULL; | |
1803 | spin_unlock_irq(sch->lock); | |
1804 | if (cm_enabled) { | |
1805 | /* Don't have the css write on memory. */ | |
1806 | ret = ccw_set_cmf(cdev, 0); | |
1807 | if (ret) | |
1808 | return ret; | |
1809 | } | |
1810 | /* From here on, disallow device driver I/O. */ | |
1811 | spin_lock_irq(sch->lock); | |
1812 | ret = cio_disable_subchannel(sch); | |
1813 | spin_unlock_irq(sch->lock); | |
1814 | ||
1815 | return ret; | |
1816 | } | |
1817 | ||
1818 | static int ccw_device_pm_thaw(struct device *dev) | |
1819 | { | |
1820 | struct ccw_device *cdev = to_ccwdev(dev); | |
1821 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1822 | int ret, cm_enabled; | |
1823 | ||
1824 | if (!cdev->online) | |
1825 | return 0; | |
1826 | ||
1827 | spin_lock_irq(sch->lock); | |
1828 | /* Allow device driver I/O again. */ | |
1829 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1830 | cm_enabled = cdev->private->cmb != NULL; | |
1831 | spin_unlock_irq(sch->lock); | |
1832 | if (ret) | |
1833 | return ret; | |
1834 | ||
1835 | if (cm_enabled) { | |
1836 | ret = ccw_set_cmf(cdev, 1); | |
1837 | if (ret) | |
1838 | return ret; | |
1839 | } | |
1840 | ||
1841 | if (cdev->drv && cdev->drv->thaw) | |
1842 | ret = cdev->drv->thaw(cdev); | |
1843 | ||
1844 | return ret; | |
1845 | } | |
1846 | ||
1847 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1848 | { | |
1849 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a | 1850 | |
0d01bb89 SO |
1851 | spin_lock_irq(sch->lock); |
1852 | if (cio_is_console(sch->schid)) { | |
1853 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1854 | goto out_unlock; | |
1855 | } | |
823d494a SO |
1856 | /* |
1857 | * While we were sleeping, devices may have gone or become | |
1858 | * available again. Kick re-detection. | |
1859 | */ | |
823d494a | 1860 | cdev->private->flags.resuming = 1; |
b17295e6 | 1861 | cdev->private->path_new_mask = LPM_ANYPATH; |
817e5000 | 1862 | css_sched_sch_todo(sch, SCH_TODO_EVAL); |
0d01bb89 | 1863 | spin_unlock_irq(sch->lock); |
817e5000 | 1864 | css_wait_for_slow_path(); |
0d01bb89 SO |
1865 | |
1866 | /* cdev may have been moved to a different subchannel. */ | |
1867 | sch = to_subchannel(cdev->dev.parent); | |
1868 | spin_lock_irq(sch->lock); | |
1869 | if (cdev->private->state != DEV_STATE_ONLINE && | |
1870 | cdev->private->state != DEV_STATE_OFFLINE) | |
1871 | goto out_unlock; | |
1872 | ||
736b5db8 | 1873 | ccw_device_recognition(cdev); |
823d494a | 1874 | spin_unlock_irq(sch->lock); |
823d494a SO |
1875 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1876 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
0d01bb89 SO |
1877 | spin_lock_irq(sch->lock); |
1878 | ||
1879 | out_unlock: | |
823d494a | 1880 | cdev->private->flags.resuming = 0; |
0d01bb89 | 1881 | spin_unlock_irq(sch->lock); |
823d494a SO |
1882 | } |
1883 | ||
1884 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1885 | { | |
1886 | cdev->private->state = DEV_STATE_BOXED; | |
76e6fb4b | 1887 | if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK) |
823d494a | 1888 | return 0; |
37de53bb | 1889 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1890 | return -ENODEV; |
1891 | } | |
1892 | ||
1893 | static int resume_handle_disc(struct ccw_device *cdev) | |
1894 | { | |
1895 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
76e6fb4b | 1896 | if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK) |
823d494a | 1897 | return 0; |
37de53bb | 1898 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1899 | return -ENODEV; |
1900 | } | |
1901 | ||
1902 | static int ccw_device_pm_restore(struct device *dev) | |
1903 | { | |
1904 | struct ccw_device *cdev = to_ccwdev(dev); | |
0d01bb89 SO |
1905 | struct subchannel *sch; |
1906 | int ret = 0; | |
823d494a SO |
1907 | |
1908 | __ccw_device_pm_restore(cdev); | |
0d01bb89 | 1909 | sch = to_subchannel(cdev->dev.parent); |
823d494a | 1910 | spin_lock_irq(sch->lock); |
0d01bb89 | 1911 | if (cio_is_console(sch->schid)) |
823d494a | 1912 | goto out_restore; |
0d01bb89 | 1913 | |
823d494a SO |
1914 | /* check recognition results */ |
1915 | switch (cdev->private->state) { | |
1916 | case DEV_STATE_OFFLINE: | |
0d01bb89 SO |
1917 | case DEV_STATE_ONLINE: |
1918 | cdev->private->flags.donotify = 0; | |
823d494a SO |
1919 | break; |
1920 | case DEV_STATE_BOXED: | |
1921 | ret = resume_handle_boxed(cdev); | |
823d494a | 1922 | if (ret) |
0d01bb89 | 1923 | goto out_unlock; |
823d494a | 1924 | goto out_restore; |
823d494a | 1925 | default: |
0d01bb89 SO |
1926 | ret = resume_handle_disc(cdev); |
1927 | if (ret) | |
1928 | goto out_unlock; | |
1929 | goto out_restore; | |
823d494a SO |
1930 | } |
1931 | /* check if the device type has changed */ | |
1932 | if (!ccw_device_test_sense_data(cdev)) { | |
1933 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1934 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1935 | ret = -ENODEV; |
1936 | goto out_unlock; | |
1937 | } | |
0d01bb89 | 1938 | if (!cdev->online) |
823d494a | 1939 | goto out_unlock; |
823d494a | 1940 | |
0d01bb89 SO |
1941 | if (ccw_device_online(cdev)) { |
1942 | ret = resume_handle_disc(cdev); | |
1943 | if (ret) | |
1944 | goto out_unlock; | |
1945 | goto out_restore; | |
1946 | } | |
823d494a | 1947 | spin_unlock_irq(sch->lock); |
823d494a | 1948 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
0d01bb89 SO |
1949 | spin_lock_irq(sch->lock); |
1950 | ||
1951 | if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) { | |
1952 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1953 | ret = -ENODEV; | |
1954 | goto out_unlock; | |
823d494a | 1955 | } |
0d01bb89 SO |
1956 | |
1957 | /* reenable cmf, if needed */ | |
1958 | if (cdev->private->cmb) { | |
1959 | spin_unlock_irq(sch->lock); | |
823d494a | 1960 | ret = ccw_set_cmf(cdev, 1); |
0d01bb89 | 1961 | spin_lock_irq(sch->lock); |
823d494a | 1962 | if (ret) { |
f014824e SO |
1963 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1964 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1965 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1966 | ret = 0; |
1967 | } | |
1968 | } | |
1969 | ||
1970 | out_restore: | |
0d01bb89 | 1971 | spin_unlock_irq(sch->lock); |
823d494a SO |
1972 | if (cdev->online && cdev->drv && cdev->drv->restore) |
1973 | ret = cdev->drv->restore(cdev); | |
823d494a SO |
1974 | return ret; |
1975 | ||
823d494a SO |
1976 | out_unlock: |
1977 | spin_unlock_irq(sch->lock); | |
1978 | return ret; | |
1979 | } | |
1980 | ||
47145210 | 1981 | static const struct dev_pm_ops ccw_pm_ops = { |
823d494a SO |
1982 | .prepare = ccw_device_pm_prepare, |
1983 | .complete = ccw_device_pm_complete, | |
1984 | .freeze = ccw_device_pm_freeze, | |
1985 | .thaw = ccw_device_pm_thaw, | |
1986 | .restore = ccw_device_pm_restore, | |
1987 | }; | |
1988 | ||
d5ab5276 | 1989 | static struct bus_type ccw_bus_type = { |
8bbace7e CH |
1990 | .name = "ccw", |
1991 | .match = ccw_bus_match, | |
1992 | .uevent = ccw_uevent, | |
1993 | .probe = ccw_device_probe, | |
1994 | .remove = ccw_device_remove, | |
958974fb | 1995 | .shutdown = ccw_device_shutdown, |
823d494a | 1996 | .pm = &ccw_pm_ops, |
8bbace7e CH |
1997 | }; |
1998 | ||
b2ffd8e9 CH |
1999 | /** |
2000 | * ccw_driver_register() - register a ccw driver | |
2001 | * @cdriver: driver to be registered | |
2002 | * | |
2003 | * This function is mainly a wrapper around driver_register(). | |
2004 | * Returns: | |
2005 | * %0 on success and a negative error value on failure. | |
2006 | */ | |
2007 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2008 | { |
2009 | struct device_driver *drv = &cdriver->driver; | |
2010 | ||
2011 | drv->bus = &ccw_bus_type; | |
1da177e4 LT |
2012 | |
2013 | return driver_register(drv); | |
2014 | } | |
2015 | ||
b2ffd8e9 CH |
2016 | /** |
2017 | * ccw_driver_unregister() - deregister a ccw driver | |
2018 | * @cdriver: driver to be deregistered | |
2019 | * | |
2020 | * This function is mainly a wrapper around driver_unregister(). | |
2021 | */ | |
2022 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2023 | { |
2024 | driver_unregister(&cdriver->driver); | |
2025 | } | |
2026 | ||
37de53bb PO |
2027 | static void ccw_device_todo(struct work_struct *work) |
2028 | { | |
2029 | struct ccw_device_private *priv; | |
2030 | struct ccw_device *cdev; | |
2031 | struct subchannel *sch; | |
2032 | enum cdev_todo todo; | |
2033 | ||
2034 | priv = container_of(work, struct ccw_device_private, todo_work); | |
2035 | cdev = priv->cdev; | |
2036 | sch = to_subchannel(cdev->dev.parent); | |
2037 | /* Find out todo. */ | |
2038 | spin_lock_irq(cdev->ccwlock); | |
2039 | todo = priv->todo; | |
2040 | priv->todo = CDEV_TODO_NOTHING; | |
2041 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
2042 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
2043 | spin_unlock_irq(cdev->ccwlock); | |
2044 | /* Perform todo. */ | |
2045 | switch (todo) { | |
2046 | case CDEV_TODO_ENABLE_CMF: | |
2047 | cmf_reenable(cdev); | |
2048 | break; | |
2049 | case CDEV_TODO_REBIND: | |
2050 | ccw_device_do_unbind_bind(cdev); | |
2051 | break; | |
2052 | case CDEV_TODO_REGISTER: | |
2053 | io_subchannel_register(cdev); | |
2054 | break; | |
2055 | case CDEV_TODO_UNREG_EVAL: | |
2056 | if (!sch_is_pseudo_sch(sch)) | |
2057 | css_schedule_eval(sch->schid); | |
2058 | /* fall-through */ | |
2059 | case CDEV_TODO_UNREG: | |
2060 | if (sch_is_pseudo_sch(sch)) | |
2061 | ccw_device_unregister(cdev); | |
2062 | else | |
2063 | ccw_device_call_sch_unregister(cdev); | |
2064 | break; | |
2065 | default: | |
2066 | break; | |
2067 | } | |
2068 | /* Release workqueue ref. */ | |
2069 | put_device(&cdev->dev); | |
2070 | } | |
2071 | ||
2072 | /** | |
2073 | * ccw_device_sched_todo - schedule ccw device operation | |
2074 | * @cdev: ccw device | |
2075 | * @todo: todo | |
2076 | * | |
2077 | * Schedule the operation identified by @todo to be performed on the slow path | |
2078 | * workqueue. Do nothing if another operation with higher priority is already | |
2079 | * scheduled. Needs to be called with ccwdev lock held. | |
2080 | */ | |
2081 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2082 | { | |
2083 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2084 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2085 | todo); | |
2086 | if (cdev->private->todo >= todo) | |
2087 | return; | |
2088 | cdev->private->todo = todo; | |
2089 | /* Get workqueue ref. */ | |
2090 | if (!get_device(&cdev->dev)) | |
2091 | return; | |
be5d3823 | 2092 | if (!queue_work(cio_work_q, &cdev->private->todo_work)) { |
37de53bb PO |
2093 | /* Already queued, release workqueue ref. */ |
2094 | put_device(&cdev->dev); | |
2095 | } | |
2096 | } | |
2097 | ||
fd0457a6 ME |
2098 | /** |
2099 | * ccw_device_siosl() - initiate logging | |
2100 | * @cdev: ccw device | |
2101 | * | |
2102 | * This function is used to invoke model-dependent logging within the channel | |
2103 | * subsystem. | |
2104 | */ | |
2105 | int ccw_device_siosl(struct ccw_device *cdev) | |
2106 | { | |
2107 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2108 | ||
2109 | return chsc_siosl(sch->schid); | |
2110 | } | |
2111 | EXPORT_SYMBOL_GPL(ccw_device_siosl); | |
2112 | ||
1da177e4 LT |
2113 | EXPORT_SYMBOL(ccw_device_set_online); |
2114 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2115 | EXPORT_SYMBOL(ccw_driver_register); | |
2116 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2117 | EXPORT_SYMBOL(get_ccwdev_by_busid); |