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Commit | Line | Data |
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724117b7 | 1 | // SPDX-License-Identifier: GPL-1.0+ |
1da177e4 | 2 | /* |
1da177e4 | 3 | * bus driver for ccw devices |
1da177e4 | 4 | * |
a53c8fab | 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 | */ | |
a7ae2c02 PO |
10 | |
11 | #define KMSG_COMPONENT "cio" | |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
a00f761f | 14 | #include <linux/export.h> |
1da177e4 LT |
15 | #include <linux/init.h> |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/workqueue.h> | |
188561a4 | 23 | #include <linux/delay.h> |
90ab1336 | 24 | #include <linux/timer.h> |
de400d6b | 25 | #include <linux/kernel_stat.h> |
174cd4b1 | 26 | #include <linux/sched/signal.h> |
1da177e4 LT |
27 | |
28 | #include <asm/ccwdev.h> | |
29 | #include <asm/cio.h> | |
4e57b681 | 30 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 31 | #include <asm/cmb.h> |
3a3fc29a | 32 | #include <asm/isc.h> |
1da177e4 | 33 | |
0ae7a7b2 | 34 | #include "chp.h" |
1da177e4 | 35 | #include "cio.h" |
d7b5a4c9 | 36 | #include "cio_debug.h" |
1da177e4 LT |
37 | #include "css.h" |
38 | #include "device.h" | |
39 | #include "ioasm.h" | |
cd6b4f27 | 40 | #include "io_sch.h" |
ecf5d9ef | 41 | #include "blacklist.h" |
fd0457a6 | 42 | #include "chsc.h" |
1da177e4 | 43 | |
90ab1336 | 44 | static struct timer_list recovery_timer; |
486d0a00 | 45 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
46 | static int recovery_phase; |
47 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
48 | ||
0ad8f714 SO |
49 | static atomic_t ccw_device_init_count = ATOMIC_INIT(0); |
50 | static DECLARE_WAIT_QUEUE_HEAD(ccw_device_init_wq); | |
51 | static struct bus_type ccw_bus_type; | |
52 | ||
1da177e4 LT |
53 | /******************* bus type handling ***********************/ |
54 | ||
55 | /* The Linux driver model distinguishes between a bus type and | |
56 | * the bus itself. Of course we only have one channel | |
57 | * subsystem driver and one channel system per machine, but | |
58 | * we still use the abstraction. T.R. says it's a good idea. */ | |
59 | static int | |
60 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
61 | { | |
62 | struct ccw_device *cdev = to_ccwdev(dev); | |
63 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
64 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
65 | ||
66 | if (!ids) | |
67 | return 0; | |
68 | ||
69 | found = ccw_device_id_match(ids, &cdev->id); | |
70 | if (!found) | |
71 | return 0; | |
72 | ||
73 | cdev->id.driver_info = found->driver_info; | |
74 | ||
75 | return 1; | |
76 | } | |
77 | ||
db0c2d59 PO |
78 | /* Store modalias string delimited by prefix/suffix string into buffer with |
79 | * specified size. Return length of resulting string (excluding trailing '\0') | |
80 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 81 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 82 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 83 | { |
db0c2d59 | 84 | int len; |
1da177e4 | 85 | |
cfbe9bb2 | 86 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
87 | if (len > size) |
88 | return len; | |
89 | buf += len; | |
90 | size -= len; | |
1da177e4 | 91 | |
db0c2d59 PO |
92 | if (id->dev_type != 0) |
93 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
94 | id->dev_model, suffix); | |
95 | else | |
96 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 97 | |
db0c2d59 PO |
98 | return len; |
99 | } | |
100 | ||
101 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
102 | * non-zero otherwise. */ | |
7eff2e7a | 103 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
104 | { |
105 | struct ccw_device *cdev = to_ccwdev(dev); | |
106 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
107 | int ret; |
108 | char modalias_buf[30]; | |
1da177e4 | 109 | |
db0c2d59 | 110 | /* CU_TYPE= */ |
7eff2e7a | 111 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
112 | if (ret) |
113 | return ret; | |
db0c2d59 PO |
114 | |
115 | /* CU_MODEL= */ | |
7eff2e7a | 116 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
117 | if (ret) |
118 | return ret; | |
1da177e4 LT |
119 | |
120 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 121 | /* DEV_TYPE= */ |
7eff2e7a | 122 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
123 | if (ret) |
124 | return ret; | |
1da177e4 | 125 | |
db0c2d59 | 126 | /* DEV_MODEL= */ |
7eff2e7a | 127 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
128 | if (ret) |
129 | return ret; | |
db0c2d59 PO |
130 | |
131 | /* MODALIAS= */ | |
cfbe9bb2 | 132 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
133 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
134 | return ret; | |
1da177e4 LT |
135 | } |
136 | ||
602b20f2 CH |
137 | static void io_subchannel_irq(struct subchannel *); |
138 | static int io_subchannel_probe(struct subchannel *); | |
139 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 140 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 141 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
142 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
143 | int); | |
846d0c6f | 144 | static void recovery_func(struct timer_list *unused); |
1da177e4 | 145 | |
f08adc00 CH |
146 | static struct css_device_id io_subchannel_ids[] = { |
147 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
148 | { /* end of list */ }, | |
149 | }; | |
f08adc00 | 150 | |
93a27592 CH |
151 | static int io_subchannel_prepare(struct subchannel *sch) |
152 | { | |
153 | struct ccw_device *cdev; | |
154 | /* | |
155 | * Don't allow suspend while a ccw device registration | |
156 | * is still outstanding. | |
157 | */ | |
158 | cdev = sch_get_cdev(sch); | |
159 | if (cdev && !device_is_registered(&cdev->dev)) | |
160 | return -EAGAIN; | |
161 | return 0; | |
162 | } | |
163 | ||
b4c70721 | 164 | static int io_subchannel_settle(void) |
8ea7f559 | 165 | { |
b4c70721 SO |
166 | int ret; |
167 | ||
168 | ret = wait_event_interruptible(ccw_device_init_wq, | |
169 | atomic_read(&ccw_device_init_count) == 0); | |
170 | if (ret) | |
171 | return -EINTR; | |
be5d3823 | 172 | flush_workqueue(cio_work_q); |
b4c70721 | 173 | return 0; |
8ea7f559 SO |
174 | } |
175 | ||
f7e5d67c | 176 | static struct css_driver io_subchannel_driver = { |
e6aed122 SO |
177 | .drv = { |
178 | .owner = THIS_MODULE, | |
179 | .name = "io_subchannel", | |
180 | }, | |
f08adc00 | 181 | .subchannel_type = io_subchannel_ids, |
1da177e4 | 182 | .irq = io_subchannel_irq, |
c820de39 CH |
183 | .sch_event = io_subchannel_sch_event, |
184 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
185 | .probe = io_subchannel_probe, |
186 | .remove = io_subchannel_remove, | |
187 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 188 | .prepare = io_subchannel_prepare, |
8ea7f559 | 189 | .settle = io_subchannel_settle, |
1da177e4 LT |
190 | }; |
191 | ||
2f17644d | 192 | int __init io_subchannel_init(void) |
1da177e4 LT |
193 | { |
194 | int ret; | |
195 | ||
846d0c6f | 196 | timer_setup(&recovery_timer, recovery_func, 0); |
be5d3823 SO |
197 | ret = bus_register(&ccw_bus_type); |
198 | if (ret) | |
199 | return ret; | |
25b7bb58 CH |
200 | ret = css_driver_register(&io_subchannel_driver); |
201 | if (ret) | |
be5d3823 | 202 | bus_unregister(&ccw_bus_type); |
1da177e4 | 203 | |
1da177e4 LT |
204 | return ret; |
205 | } | |
206 | ||
1da177e4 LT |
207 | |
208 | /************************ device handling **************************/ | |
209 | ||
1da177e4 | 210 | static ssize_t |
3fd3c0a5 | 211 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
212 | { |
213 | struct ccw_device *cdev = to_ccwdev(dev); | |
214 | struct ccw_device_id *id = &(cdev->id); | |
215 | ||
216 | if (id->dev_type != 0) | |
217 | return sprintf(buf, "%04x/%02x\n", | |
218 | id->dev_type, id->dev_model); | |
219 | else | |
220 | return sprintf(buf, "n/a\n"); | |
221 | } | |
222 | ||
223 | static ssize_t | |
3fd3c0a5 | 224 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
225 | { |
226 | struct ccw_device *cdev = to_ccwdev(dev); | |
227 | struct ccw_device_id *id = &(cdev->id); | |
228 | ||
229 | return sprintf(buf, "%04x/%02x\n", | |
230 | id->cu_type, id->cu_model); | |
231 | } | |
232 | ||
f1fc78a8 BB |
233 | static ssize_t |
234 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
235 | { | |
236 | struct ccw_device *cdev = to_ccwdev(dev); | |
237 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 238 | int len; |
f1fc78a8 | 239 | |
086a6c62 | 240 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
241 | |
242 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
243 | } |
244 | ||
1da177e4 | 245 | static ssize_t |
3fd3c0a5 | 246 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
247 | { |
248 | struct ccw_device *cdev = to_ccwdev(dev); | |
249 | ||
250 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
251 | } | |
252 | ||
d7b5a4c9 CH |
253 | int ccw_device_is_orphan(struct ccw_device *cdev) |
254 | { | |
255 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
256 | } | |
257 | ||
ef99516c | 258 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 259 | { |
7d253b9a | 260 | if (device_is_registered(&cdev->dev)) { |
24a1872d | 261 | /* Undo device_add(). */ |
ef99516c | 262 | device_del(&cdev->dev); |
24a1872d SO |
263 | } |
264 | if (cdev->private->flags.initialized) { | |
265 | cdev->private->flags.initialized = 0; | |
3b554a14 SO |
266 | /* Release reference from device_initialize(). */ |
267 | put_device(&cdev->dev); | |
268 | } | |
7674da77 CH |
269 | } |
270 | ||
d40f7b75 SO |
271 | static void io_subchannel_quiesce(struct subchannel *); |
272 | ||
b2ffd8e9 CH |
273 | /** |
274 | * ccw_device_set_offline() - disable a ccw device for I/O | |
275 | * @cdev: target ccw device | |
276 | * | |
277 | * This function calls the driver's set_offline() function for @cdev, if | |
278 | * given, and then disables @cdev. | |
279 | * Returns: | |
280 | * %0 on success and a negative error value on failure. | |
281 | * Context: | |
282 | * enabled, ccw device lock not held | |
283 | */ | |
284 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 | 285 | { |
d40f7b75 SO |
286 | struct subchannel *sch; |
287 | int ret, state; | |
1da177e4 LT |
288 | |
289 | if (!cdev) | |
290 | return -ENODEV; | |
291 | if (!cdev->online || !cdev->drv) | |
292 | return -EINVAL; | |
293 | ||
294 | if (cdev->drv->set_offline) { | |
295 | ret = cdev->drv->set_offline(cdev); | |
296 | if (ret != 0) | |
297 | return ret; | |
298 | } | |
1da177e4 | 299 | spin_lock_irq(cdev->ccwlock); |
d40f7b75 | 300 | sch = to_subchannel(cdev->dev.parent); |
74bd0d85 | 301 | cdev->online = 0; |
217ee6c6 ME |
302 | /* Wait until a final state or DISCONNECTED is reached */ |
303 | while (!dev_fsm_final_state(cdev) && | |
304 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 305 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
306 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
307 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
308 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 309 | } |
d40f7b75 SO |
310 | do { |
311 | ret = ccw_device_offline(cdev); | |
312 | if (!ret) | |
313 | break; | |
314 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " | |
315 | "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, | |
316 | cdev->private->dev_id.devno); | |
317 | if (ret != -EBUSY) | |
318 | goto error; | |
319 | state = cdev->private->state; | |
320 | spin_unlock_irq(cdev->ccwlock); | |
321 | io_subchannel_quiesce(sch); | |
322 | spin_lock_irq(cdev->ccwlock); | |
323 | cdev->private->state = state; | |
324 | } while (ret == -EBUSY); | |
1da177e4 | 325 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
326 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
327 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
a7ae2c02 PO |
328 | /* Inform the user if set offline failed. */ |
329 | if (cdev->private->state == DEV_STATE_BOXED) { | |
baebc70a JP |
330 | pr_warn("%s: The device entered boxed state while being set offline\n", |
331 | dev_name(&cdev->dev)); | |
a7ae2c02 | 332 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { |
baebc70a JP |
333 | pr_warn("%s: The device stopped operating while being set offline\n", |
334 | dev_name(&cdev->dev)); | |
a7ae2c02 | 335 | } |
217ee6c6 ME |
336 | /* Give up reference from ccw_device_set_online(). */ |
337 | put_device(&cdev->dev); | |
338 | return 0; | |
339 | ||
340 | error: | |
217ee6c6 ME |
341 | cdev->private->state = DEV_STATE_OFFLINE; |
342 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
343 | spin_unlock_irq(cdev->ccwlock); | |
344 | /* Give up reference from ccw_device_set_online(). */ | |
345 | put_device(&cdev->dev); | |
346 | return -ENODEV; | |
1da177e4 LT |
347 | } |
348 | ||
b2ffd8e9 CH |
349 | /** |
350 | * ccw_device_set_online() - enable a ccw device for I/O | |
351 | * @cdev: target ccw device | |
352 | * | |
353 | * This function first enables @cdev and then calls the driver's set_online() | |
354 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
355 | * disabled again. | |
356 | * Returns: | |
357 | * %0 on success and a negative error value on failure. | |
358 | * Context: | |
359 | * enabled, ccw device lock not held | |
360 | */ | |
361 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
362 | { |
363 | int ret; | |
217ee6c6 | 364 | int ret2; |
1da177e4 LT |
365 | |
366 | if (!cdev) | |
367 | return -ENODEV; | |
368 | if (cdev->online || !cdev->drv) | |
369 | return -EINVAL; | |
9cd67421 CH |
370 | /* Hold on to an extra reference while device is online. */ |
371 | if (!get_device(&cdev->dev)) | |
372 | return -ENODEV; | |
1da177e4 LT |
373 | |
374 | spin_lock_irq(cdev->ccwlock); | |
375 | ret = ccw_device_online(cdev); | |
376 | spin_unlock_irq(cdev->ccwlock); | |
377 | if (ret == 0) | |
378 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
379 | else { | |
139b83dd | 380 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
381 | "device 0.%x.%04x\n", |
382 | ret, cdev->private->dev_id.ssid, | |
383 | cdev->private->dev_id.devno); | |
9cd67421 CH |
384 | /* Give up online reference since onlining failed. */ |
385 | put_device(&cdev->dev); | |
1da177e4 LT |
386 | return ret; |
387 | } | |
217ee6c6 ME |
388 | spin_lock_irq(cdev->ccwlock); |
389 | /* Check if online processing was successful */ | |
390 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
391 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
392 | spin_unlock_irq(cdev->ccwlock); | |
a7ae2c02 PO |
393 | /* Inform the user that set online failed. */ |
394 | if (cdev->private->state == DEV_STATE_BOXED) { | |
baebc70a JP |
395 | pr_warn("%s: Setting the device online failed because it is boxed\n", |
396 | dev_name(&cdev->dev)); | |
a7ae2c02 | 397 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { |
baebc70a JP |
398 | pr_warn("%s: Setting the device online failed because it is not operational\n", |
399 | dev_name(&cdev->dev)); | |
a7ae2c02 | 400 | } |
9cd67421 CH |
401 | /* Give up online reference since onlining failed. */ |
402 | put_device(&cdev->dev); | |
1da177e4 | 403 | return -ENODEV; |
9cd67421 | 404 | } |
217ee6c6 ME |
405 | spin_unlock_irq(cdev->ccwlock); |
406 | if (cdev->drv->set_online) | |
407 | ret = cdev->drv->set_online(cdev); | |
408 | if (ret) | |
409 | goto rollback; | |
74bd0d85 SO |
410 | |
411 | spin_lock_irq(cdev->ccwlock); | |
217ee6c6 | 412 | cdev->online = 1; |
74bd0d85 | 413 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
414 | return 0; |
415 | ||
416 | rollback: | |
1da177e4 | 417 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
418 | /* Wait until a final state or DISCONNECTED is reached */ |
419 | while (!dev_fsm_final_state(cdev) && | |
420 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
421 | spin_unlock_irq(cdev->ccwlock); | |
422 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
423 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
424 | spin_lock_irq(cdev->ccwlock); | |
425 | } | |
426 | ret2 = ccw_device_offline(cdev); | |
427 | if (ret2) | |
428 | goto error; | |
429 | spin_unlock_irq(cdev->ccwlock); | |
430 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
431 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
432 | /* Give up online reference since onlining failed. */ | |
433 | put_device(&cdev->dev); | |
434 | return ret; | |
435 | ||
436 | error: | |
437 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
438 | "device 0.%x.%04x\n", | |
439 | ret2, cdev->private->dev_id.ssid, | |
440 | cdev->private->dev_id.devno); | |
441 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 442 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
443 | /* Give up online reference since onlining failed. */ |
444 | put_device(&cdev->dev); | |
217ee6c6 | 445 | return ret; |
1da177e4 LT |
446 | } |
447 | ||
e74fe0ce | 448 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 449 | { |
37de53bb PO |
450 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
451 | spin_lock_irq(cdev->ccwlock); | |
452 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
453 | spin_unlock_irq(cdev->ccwlock); | |
7cd40314 SO |
454 | return 0; |
455 | } | |
456 | if (cdev->drv && cdev->drv->set_offline) | |
e74fe0ce | 457 | return ccw_device_set_offline(cdev); |
7cd40314 | 458 | return -EINVAL; |
f5ba6c86 CH |
459 | } |
460 | ||
461 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
462 | { | |
f5ba6c86 | 463 | /* Do device recognition, if needed. */ |
99f6a570 | 464 | if (cdev->private->state == DEV_STATE_BOXED) { |
1f5bd384 | 465 | spin_lock_irq(cdev->ccwlock); |
736b5db8 | 466 | ccw_device_recognition(cdev); |
1f5bd384 | 467 | spin_unlock_irq(cdev->ccwlock); |
f5ba6c86 CH |
468 | wait_event(cdev->private->wait_q, |
469 | cdev->private->flags.recog_done); | |
156013ff SO |
470 | if (cdev->private->state != DEV_STATE_OFFLINE) |
471 | /* recognition failed */ | |
472 | return -EAGAIN; | |
f5ba6c86 CH |
473 | } |
474 | if (cdev->drv && cdev->drv->set_online) | |
7cd40314 SO |
475 | return ccw_device_set_online(cdev); |
476 | return -EINVAL; | |
f5ba6c86 | 477 | } |
156013ff | 478 | |
c78aa6cb | 479 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
480 | { |
481 | int ret; | |
482 | ||
483 | ret = online_store_recog_and_online(cdev); | |
156013ff | 484 | if (ret && !force) |
c78aa6cb | 485 | return ret; |
f5ba6c86 CH |
486 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
487 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
488 | if (ret) |
489 | return ret; | |
f5ba6c86 CH |
490 | if (cdev->id.cu_type == 0) |
491 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
492 | ret = online_store_recog_and_online(cdev); |
493 | if (ret) | |
494 | return ret; | |
f5ba6c86 | 495 | } |
c78aa6cb | 496 | return 0; |
f5ba6c86 CH |
497 | } |
498 | ||
499 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
500 | const char *buf, size_t count) | |
1da177e4 LT |
501 | { |
502 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
503 | int force, ret; |
504 | unsigned long i; | |
1da177e4 | 505 | |
a2fc8485 | 506 | /* Prevent conflict between multiple on-/offline processing requests. */ |
350e9120 | 507 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 | 508 | return -EAGAIN; |
a2fc8485 PO |
509 | /* Prevent conflict between internal I/Os and on-/offline processing. */ |
510 | if (!dev_fsm_final_state(cdev) && | |
511 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
512 | ret = -EAGAIN; | |
00381eeb | 513 | goto out; |
a2fc8485 PO |
514 | } |
515 | /* Prevent conflict between pending work and on-/offline processing.*/ | |
516 | if (work_pending(&cdev->private->todo_work)) { | |
517 | ret = -EAGAIN; | |
00381eeb | 518 | goto out; |
1da177e4 LT |
519 | } |
520 | if (!strncmp(buf, "force\n", count)) { | |
521 | force = 1; | |
522 | i = 1; | |
2f972202 | 523 | ret = 0; |
1da177e4 LT |
524 | } else { |
525 | force = 0; | |
0178722b | 526 | ret = kstrtoul(buf, 16, &i); |
1da177e4 | 527 | } |
2f972202 CH |
528 | if (ret) |
529 | goto out; | |
00381eeb SO |
530 | |
531 | device_lock(dev); | |
f5ba6c86 CH |
532 | switch (i) { |
533 | case 0: | |
e74fe0ce | 534 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
535 | break; |
536 | case 1: | |
c78aa6cb | 537 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
538 | break; |
539 | default: | |
2f972202 | 540 | ret = -EINVAL; |
1da177e4 | 541 | } |
00381eeb SO |
542 | device_unlock(dev); |
543 | ||
2f972202 | 544 | out: |
1da177e4 | 545 | atomic_set(&cdev->private->onoff, 0); |
e74fe0ce | 546 | return (ret < 0) ? ret : count; |
1da177e4 LT |
547 | } |
548 | ||
549 | static ssize_t | |
3fd3c0a5 | 550 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
551 | { |
552 | struct ccw_device *cdev = to_ccwdev(dev); | |
553 | struct subchannel *sch; | |
554 | ||
d7b5a4c9 CH |
555 | if (ccw_device_is_orphan(cdev)) |
556 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
557 | switch (cdev->private->state) { |
558 | case DEV_STATE_BOXED: | |
559 | return sprintf(buf, "boxed\n"); | |
560 | case DEV_STATE_DISCONNECTED: | |
561 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
562 | case DEV_STATE_NOT_OPER: | |
563 | sch = to_subchannel(dev->parent); | |
564 | if (!sch->lpm) | |
565 | return sprintf(buf, "no path\n"); | |
566 | else | |
567 | return sprintf(buf, "no device\n"); | |
568 | default: | |
569 | /* All other states considered fine. */ | |
570 | return sprintf(buf, "good\n"); | |
571 | } | |
572 | } | |
573 | ||
fd0457a6 ME |
574 | static ssize_t |
575 | initiate_logging(struct device *dev, struct device_attribute *attr, | |
576 | const char *buf, size_t count) | |
577 | { | |
578 | struct subchannel *sch = to_subchannel(dev); | |
579 | int rc; | |
580 | ||
581 | rc = chsc_siosl(sch->schid); | |
582 | if (rc < 0) { | |
baebc70a JP |
583 | pr_warn("Logging for subchannel 0.%x.%04x failed with errno=%d\n", |
584 | sch->schid.ssid, sch->schid.sch_no, rc); | |
fd0457a6 ME |
585 | return rc; |
586 | } | |
587 | pr_notice("Logging for subchannel 0.%x.%04x was triggered\n", | |
588 | sch->schid.ssid, sch->schid.sch_no); | |
589 | return count; | |
590 | } | |
591 | ||
84c57ad5 SO |
592 | static ssize_t vpm_show(struct device *dev, struct device_attribute *attr, |
593 | char *buf) | |
594 | { | |
595 | struct subchannel *sch = to_subchannel(dev); | |
596 | ||
597 | return sprintf(buf, "%02x\n", sch->vpm); | |
598 | } | |
599 | ||
1da177e4 LT |
600 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); |
601 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 602 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 603 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 | 604 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
fd0457a6 | 605 | static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); |
84c57ad5 | 606 | static DEVICE_ATTR(vpm, 0444, vpm_show, NULL); |
1da177e4 | 607 | |
7e9db9ea | 608 | static struct attribute *io_subchannel_attrs[] = { |
fd0457a6 | 609 | &dev_attr_logging.attr, |
84c57ad5 | 610 | &dev_attr_vpm.attr, |
1da177e4 LT |
611 | NULL, |
612 | }; | |
613 | ||
f460d113 | 614 | static const struct attribute_group io_subchannel_attr_group = { |
7e9db9ea | 615 | .attrs = io_subchannel_attrs, |
529192f3 | 616 | }; |
1da177e4 LT |
617 | |
618 | static struct attribute * ccwdev_attrs[] = { | |
619 | &dev_attr_devtype.attr, | |
620 | &dev_attr_cutype.attr, | |
f1fc78a8 | 621 | &dev_attr_modalias.attr, |
1da177e4 LT |
622 | &dev_attr_online.attr, |
623 | &dev_attr_cmb_enable.attr, | |
624 | &dev_attr_availability.attr, | |
625 | NULL, | |
626 | }; | |
627 | ||
f460d113 | 628 | static const struct attribute_group ccwdev_attr_group = { |
1da177e4 LT |
629 | .attrs = ccwdev_attrs, |
630 | }; | |
631 | ||
a4dbd674 | 632 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
633 | &ccwdev_attr_group, |
634 | NULL, | |
635 | }; | |
1da177e4 | 636 | |
2c3e7e15 | 637 | static int ccw_device_add(struct ccw_device *cdev) |
1da177e4 LT |
638 | { |
639 | struct device *dev = &cdev->dev; | |
1da177e4 LT |
640 | |
641 | dev->bus = &ccw_bus_type; | |
7d253b9a | 642 | return device_add(dev); |
1da177e4 LT |
643 | } |
644 | ||
5d6e6b6f | 645 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 646 | { |
5d6e6b6f PO |
647 | struct ccw_device *cdev = to_ccwdev(dev); |
648 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 649 | |
d7b5a4c9 CH |
650 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
651 | } | |
652 | ||
b7a610f7 SO |
653 | /** |
654 | * get_ccwdev_by_dev_id() - obtain device from a ccw device id | |
655 | * @dev_id: id of the device to be searched | |
656 | * | |
657 | * This function searches all devices attached to the ccw bus for a device | |
658 | * matching @dev_id. | |
659 | * Returns: | |
660 | * If a device is found its reference count is increased and returned; | |
661 | * else %NULL is returned. | |
662 | */ | |
663 | struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) | |
d7b5a4c9 CH |
664 | { |
665 | struct device *dev; | |
666 | ||
5d6e6b6f | 667 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
668 | |
669 | return dev ? to_ccwdev(dev) : NULL; | |
670 | } | |
b7a610f7 | 671 | EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id); |
d7b5a4c9 | 672 | |
37de53bb | 673 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 674 | { |
eb32ae8d | 675 | int ret; |
1da177e4 | 676 | |
7d253b9a | 677 | if (device_is_registered(&cdev->dev)) { |
eb32ae8d CH |
678 | device_release_driver(&cdev->dev); |
679 | ret = device_attach(&cdev->dev); | |
680 | WARN_ON(ret == -ENODEV); | |
681 | } | |
1da177e4 LT |
682 | } |
683 | ||
684 | static void | |
685 | ccw_device_release(struct device *dev) | |
686 | { | |
687 | struct ccw_device *cdev; | |
688 | ||
689 | cdev = to_ccwdev(dev); | |
6eff208f CH |
690 | /* Release reference of parent subchannel. */ |
691 | put_device(cdev->dev.parent); | |
1da177e4 LT |
692 | kfree(cdev->private); |
693 | kfree(cdev); | |
694 | } | |
695 | ||
7674da77 CH |
696 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
697 | { | |
698 | struct ccw_device *cdev; | |
699 | ||
700 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
701 | if (cdev) { | |
702 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
703 | GFP_KERNEL | GFP_DMA); | |
704 | if (cdev->private) | |
705 | return cdev; | |
706 | } | |
707 | kfree(cdev); | |
708 | return ERR_PTR(-ENOMEM); | |
709 | } | |
710 | ||
37de53bb PO |
711 | static void ccw_device_todo(struct work_struct *work); |
712 | ||
7674da77 CH |
713 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
714 | struct ccw_device *cdev) | |
715 | { | |
2c3e7e15 SO |
716 | struct ccw_device_private *priv = cdev->private; |
717 | int ret; | |
718 | ||
719 | priv->cdev = cdev; | |
720 | priv->int_class = IRQIO_CIO; | |
721 | priv->state = DEV_STATE_NOT_OPER; | |
722 | priv->dev_id.devno = sch->schib.pmcw.dev; | |
723 | priv->dev_id.ssid = sch->schid.ssid; | |
2c3e7e15 SO |
724 | |
725 | INIT_WORK(&priv->todo_work, ccw_device_todo); | |
726 | INIT_LIST_HEAD(&priv->cmb_list); | |
727 | init_waitqueue_head(&priv->wait_q); | |
846d0c6f | 728 | timer_setup(&priv->timer, ccw_device_timeout, 0); |
2c3e7e15 SO |
729 | |
730 | atomic_set(&priv->onoff, 0); | |
731 | cdev->ccwlock = sch->lock; | |
7674da77 CH |
732 | cdev->dev.parent = &sch->dev; |
733 | cdev->dev.release = ccw_device_release; | |
ef99516c | 734 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
735 | /* Do first half of device_register. */ |
736 | device_initialize(&cdev->dev); | |
2c3e7e15 SO |
737 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
738 | cdev->private->dev_id.devno); | |
739 | if (ret) | |
740 | goto out_put; | |
7674da77 | 741 | if (!get_device(&sch->dev)) { |
2c3e7e15 SO |
742 | ret = -ENODEV; |
743 | goto out_put; | |
7674da77 | 744 | } |
2c3e7e15 SO |
745 | priv->flags.initialized = 1; |
746 | spin_lock_irq(sch->lock); | |
747 | sch_set_cdev(sch, cdev); | |
748 | spin_unlock_irq(sch->lock); | |
7674da77 | 749 | return 0; |
2c3e7e15 SO |
750 | |
751 | out_put: | |
752 | /* Release reference from device_initialize(). */ | |
753 | put_device(&cdev->dev); | |
754 | return ret; | |
7674da77 CH |
755 | } |
756 | ||
757 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
758 | { | |
759 | struct ccw_device *cdev; | |
760 | int ret; | |
761 | ||
762 | cdev = io_subchannel_allocate_dev(sch); | |
763 | if (!IS_ERR(cdev)) { | |
764 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 765 | if (ret) |
7674da77 | 766 | cdev = ERR_PTR(ret); |
7674da77 CH |
767 | } |
768 | return cdev; | |
769 | } | |
770 | ||
736b5db8 | 771 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 772 | |
d7b5a4c9 CH |
773 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
774 | { | |
775 | struct ccw_device *cdev; | |
776 | ||
777 | /* Need to allocate a new ccw device. */ | |
778 | cdev = io_subchannel_create_ccwdev(sch); | |
779 | if (IS_ERR(cdev)) { | |
780 | /* OK, we did everything we could... */ | |
781 | css_sch_device_unregister(sch); | |
782 | return; | |
783 | } | |
d7b5a4c9 | 784 | /* Start recognition for the new ccw device. */ |
736b5db8 | 785 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
786 | } |
787 | ||
1da177e4 LT |
788 | /* |
789 | * Register recognized device. | |
790 | */ | |
37de53bb | 791 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 792 | { |
1da177e4 | 793 | struct subchannel *sch; |
a290156f | 794 | int ret, adjust_init_count = 1; |
1da177e4 LT |
795 | unsigned long flags; |
796 | ||
1da177e4 | 797 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
798 | /* |
799 | * Check if subchannel is still registered. It may have become | |
800 | * unregistered if a machine check hit us after finishing | |
801 | * device recognition but before the register work could be | |
802 | * queued. | |
803 | */ | |
804 | if (!device_is_registered(&sch->dev)) | |
805 | goto out_err; | |
82b7ac05 | 806 | css_update_ssd_info(sch); |
47af5518 CH |
807 | /* |
808 | * io_subchannel_register() will also be called after device | |
809 | * recognition has been done for a boxed device (which will already | |
810 | * be registered). We need to reprobe since we may now have sense id | |
811 | * information. | |
812 | */ | |
d6a30761 | 813 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
814 | if (!cdev->drv) { |
815 | ret = device_reprobe(&cdev->dev); | |
816 | if (ret) | |
817 | /* We can't do much here. */ | |
139b83dd | 818 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
819 | " %d for 0.%x.%04x\n", ret, |
820 | cdev->private->dev_id.ssid, | |
821 | cdev->private->dev_id.devno); | |
47af5518 | 822 | } |
a290156f | 823 | adjust_init_count = 0; |
1da177e4 LT |
824 | goto out; |
825 | } | |
fa1a8c23 CH |
826 | /* |
827 | * Now we know this subchannel will stay, we can throw | |
828 | * our delayed uevent. | |
829 | */ | |
f67f129e | 830 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 831 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 | 832 | /* make it known to the system */ |
2c3e7e15 | 833 | ret = ccw_device_add(cdev); |
1da177e4 | 834 | if (ret) { |
e556bbbd CH |
835 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
836 | cdev->private->dev_id.ssid, | |
837 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 838 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 839 | sch_set_cdev(sch, NULL); |
2ec22984 | 840 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
841 | /* Release initial device reference. */ |
842 | put_device(&cdev->dev); | |
5fb6b854 | 843 | goto out_err; |
1da177e4 | 844 | } |
1da177e4 LT |
845 | out: |
846 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 847 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 848 | out_err: |
a290156f | 849 | if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count)) |
1da177e4 LT |
850 | wake_up(&ccw_device_init_wq); |
851 | } | |
852 | ||
37de53bb | 853 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 854 | { |
1da177e4 LT |
855 | struct subchannel *sch; |
856 | ||
46fbe4e4 PO |
857 | /* Get subchannel reference for local processing. */ |
858 | if (!get_device(cdev->dev.parent)) | |
859 | return; | |
1da177e4 | 860 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 861 | css_sch_device_unregister(sch); |
46fbe4e4 | 862 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
863 | put_device(&sch->dev); |
864 | } | |
865 | ||
866 | /* | |
867 | * subchannel recognition done. Called from the state machine. | |
868 | */ | |
869 | void | |
870 | io_subchannel_recog_done(struct ccw_device *cdev) | |
871 | { | |
1da177e4 LT |
872 | if (css_init_done == 0) { |
873 | cdev->private->flags.recog_done = 1; | |
874 | return; | |
875 | } | |
876 | switch (cdev->private->state) { | |
47593bfa SO |
877 | case DEV_STATE_BOXED: |
878 | /* Device did not respond in time. */ | |
1da177e4 LT |
879 | case DEV_STATE_NOT_OPER: |
880 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
881 | /* Remove device found not operational. */ |
882 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
883 | if (atomic_dec_and_test(&ccw_device_init_count)) |
884 | wake_up(&ccw_device_init_wq); | |
885 | break; | |
1da177e4 LT |
886 | case DEV_STATE_OFFLINE: |
887 | /* | |
888 | * We can't register the device in interrupt context so | |
889 | * we schedule a work item. | |
890 | */ | |
37de53bb | 891 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
892 | break; |
893 | } | |
894 | } | |
895 | ||
736b5db8 | 896 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 897 | { |
1da177e4 LT |
898 | /* Increase counter of devices currently in recognition. */ |
899 | atomic_inc(&ccw_device_init_count); | |
900 | ||
901 | /* Start async. device sensing. */ | |
2ec22984 | 902 | spin_lock_irq(sch->lock); |
736b5db8 | 903 | ccw_device_recognition(cdev); |
2ec22984 | 904 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
905 | } |
906 | ||
5d6e6b6f PO |
907 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
908 | struct subchannel *sch) | |
d7b5a4c9 | 909 | { |
5d6e6b6f | 910 | struct subchannel *old_sch; |
0c609fca | 911 | int rc, old_enabled = 0; |
d7b5a4c9 | 912 | |
5d6e6b6f PO |
913 | old_sch = to_subchannel(cdev->dev.parent); |
914 | /* Obtain child reference for new parent. */ | |
6eff208f | 915 | if (!get_device(&sch->dev)) |
5d6e6b6f | 916 | return -ENODEV; |
0c609fca SO |
917 | |
918 | if (!sch_is_pseudo_sch(old_sch)) { | |
919 | spin_lock_irq(old_sch->lock); | |
920 | old_enabled = old_sch->schib.pmcw.ena; | |
921 | rc = 0; | |
922 | if (old_enabled) | |
923 | rc = cio_disable_subchannel(old_sch); | |
924 | spin_unlock_irq(old_sch->lock); | |
925 | if (rc == -EBUSY) { | |
926 | /* Release child reference for new parent. */ | |
927 | put_device(&sch->dev); | |
928 | return rc; | |
929 | } | |
930 | } | |
931 | ||
d7b5a4c9 | 932 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 933 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
934 | mutex_unlock(&sch->reg_mutex); |
935 | if (rc) { | |
5d6e6b6f | 936 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
937 | cdev->private->dev_id.ssid, |
938 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f | 939 | sch->schib.pmcw.dev, rc); |
0c609fca SO |
940 | if (old_enabled) { |
941 | /* Try to reenable the old subchannel. */ | |
942 | spin_lock_irq(old_sch->lock); | |
943 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
944 | spin_unlock_irq(old_sch->lock); | |
945 | } | |
5d6e6b6f | 946 | /* Release child reference for new parent. */ |
6eff208f | 947 | put_device(&sch->dev); |
5d6e6b6f | 948 | return rc; |
d7b5a4c9 | 949 | } |
5d6e6b6f PO |
950 | /* Clean up old subchannel. */ |
951 | if (!sch_is_pseudo_sch(old_sch)) { | |
952 | spin_lock_irq(old_sch->lock); | |
953 | sch_set_cdev(old_sch, NULL); | |
5d6e6b6f PO |
954 | spin_unlock_irq(old_sch->lock); |
955 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 956 | } |
5d6e6b6f PO |
957 | /* Release child reference for old parent. */ |
958 | put_device(&old_sch->dev); | |
959 | /* Initialize new subchannel. */ | |
960 | spin_lock_irq(sch->lock); | |
5d6e6b6f PO |
961 | cdev->ccwlock = sch->lock; |
962 | if (!sch_is_pseudo_sch(sch)) | |
963 | sch_set_cdev(sch, cdev); | |
964 | spin_unlock_irq(sch->lock); | |
965 | if (!sch_is_pseudo_sch(sch)) | |
966 | css_update_ssd_info(sch); | |
967 | return 0; | |
968 | } | |
969 | ||
970 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
971 | { | |
972 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
973 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
974 | ||
975 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
976 | } |
977 | ||
602b20f2 CH |
978 | static void io_subchannel_irq(struct subchannel *sch) |
979 | { | |
980 | struct ccw_device *cdev; | |
981 | ||
db6a6423 | 982 | cdev = sch_get_cdev(sch); |
602b20f2 | 983 | |
efd986db SO |
984 | CIO_TRACE_EVENT(6, "IRQ"); |
985 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
986 | if (cdev) |
987 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
de400d6b | 988 | else |
420f42ec | 989 | inc_irq_stat(IRQIO_CIO); |
602b20f2 CH |
990 | } |
991 | ||
13952ec1 SO |
992 | void io_subchannel_init_config(struct subchannel *sch) |
993 | { | |
994 | memset(&sch->config, 0, sizeof(sch->config)); | |
995 | sch->config.csense = 1; | |
13952ec1 SO |
996 | } |
997 | ||
0ae7a7b2 CH |
998 | static void io_subchannel_init_fields(struct subchannel *sch) |
999 | { | |
1000 | if (cio_is_console(sch->schid)) | |
1001 | sch->opm = 0xff; | |
1002 | else | |
1003 | sch->opm = chp_get_sch_opm(sch); | |
1004 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1005 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1006 | |
1007 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1008 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1009 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1010 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1011 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1012 | |
1013 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1014 | } |
1015 | ||
90ed2b69 CH |
1016 | /* |
1017 | * Note: We always return 0 so that we bind to the device even on error. | |
1018 | * This is needed so that our remove function is called on unregister. | |
1019 | */ | |
0ae7a7b2 | 1020 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1021 | { |
f92519e8 | 1022 | struct io_subchannel_private *io_priv; |
1da177e4 LT |
1023 | struct ccw_device *cdev; |
1024 | int rc; | |
1da177e4 | 1025 | |
6d7c5afc | 1026 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1027 | rc = sysfs_create_group(&sch->dev.kobj, |
1028 | &io_subchannel_attr_group); | |
1029 | if (rc) | |
1030 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1031 | "attributes for subchannel " | |
1032 | "0.%x.%04x (rc=%d)\n", | |
1033 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1034 | /* |
6d7c5afc | 1035 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1036 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1037 | * the ccw_device and exit. |
1da177e4 | 1038 | */ |
f67f129e | 1039 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1040 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1041 | cdev = sch_get_cdev(sch); |
2c3e7e15 | 1042 | rc = ccw_device_add(cdev); |
afdfed0f SO |
1043 | if (rc) { |
1044 | /* Release online reference. */ | |
1045 | put_device(&cdev->dev); | |
1046 | goto out_schedule; | |
1047 | } | |
0ad8f714 SO |
1048 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1049 | wake_up(&ccw_device_init_wq); | |
1da177e4 LT |
1050 | return 0; |
1051 | } | |
0ae7a7b2 | 1052 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1053 | rc = cio_commit_config(sch); |
1054 | if (rc) | |
1055 | goto out_schedule; | |
7e9db9ea CH |
1056 | rc = sysfs_create_group(&sch->dev.kobj, |
1057 | &io_subchannel_attr_group); | |
1058 | if (rc) | |
90ed2b69 | 1059 | goto out_schedule; |
cd6b4f27 | 1060 | /* Allocate I/O subchannel private data. */ |
f92519e8 SO |
1061 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); |
1062 | if (!io_priv) | |
48e4c385 | 1063 | goto out_schedule; |
f92519e8 SO |
1064 | |
1065 | set_io_private(sch, io_priv); | |
5d6e6b6f | 1066 | css_schedule_eval(sch->schid); |
7e9db9ea | 1067 | return 0; |
48e4c385 | 1068 | |
90ed2b69 | 1069 | out_schedule: |
390935ac PO |
1070 | spin_lock_irq(sch->lock); |
1071 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1072 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1073 | return 0; |
1da177e4 LT |
1074 | } |
1075 | ||
1da177e4 | 1076 | static int |
8bbace7e | 1077 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 | 1078 | { |
f92519e8 | 1079 | struct io_subchannel_private *io_priv = to_io_private(sch); |
1da177e4 | 1080 | struct ccw_device *cdev; |
1da177e4 | 1081 | |
db6a6423 CH |
1082 | cdev = sch_get_cdev(sch); |
1083 | if (!cdev) | |
48e4c385 | 1084 | goto out_free; |
6e9a0f67 | 1085 | io_subchannel_quiesce(sch); |
1da177e4 | 1086 | /* Set ccw device to not operational and drop reference. */ |
7a8ad100 | 1087 | spin_lock_irq(cdev->ccwlock); |
db6a6423 | 1088 | sch_set_cdev(sch, NULL); |
f92519e8 | 1089 | set_io_private(sch, NULL); |
1da177e4 | 1090 | cdev->private->state = DEV_STATE_NOT_OPER; |
7a8ad100 | 1091 | spin_unlock_irq(cdev->ccwlock); |
ef99516c | 1092 | ccw_device_unregister(cdev); |
48e4c385 | 1093 | out_free: |
f92519e8 | 1094 | kfree(io_priv); |
7e9db9ea | 1095 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1096 | return 0; |
1097 | } | |
1098 | ||
602b20f2 | 1099 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1100 | { |
1101 | struct ccw_device *cdev; | |
1102 | ||
db6a6423 | 1103 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1104 | if (cdev) |
1105 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1106 | } | |
1107 | ||
c820de39 CH |
1108 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1109 | { | |
1110 | struct ccw_device *cdev; | |
1111 | ||
1112 | cdev = sch_get_cdev(sch); | |
1113 | if (!cdev) | |
1114 | return; | |
4257aaec PO |
1115 | if (cio_update_schib(sch)) |
1116 | goto err; | |
1117 | /* Check for I/O on path. */ | |
1118 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1119 | goto out; | |
1120 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1121 | ccw_device_kill_io(cdev); | |
1122 | goto out; | |
1123 | } | |
1124 | if (cio_clear(sch)) | |
1125 | goto err; | |
1126 | out: | |
1127 | /* Trigger path verification. */ | |
1128 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1129 | return; | |
c820de39 | 1130 | |
4257aaec PO |
1131 | err: |
1132 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1133 | } |
1134 | ||
99611f87 CH |
1135 | static int io_subchannel_chp_event(struct subchannel *sch, |
1136 | struct chp_link *link, int event) | |
c820de39 | 1137 | { |
585b954e | 1138 | struct ccw_device *cdev = sch_get_cdev(sch); |
c820de39 | 1139 | int mask; |
c820de39 | 1140 | |
99611f87 | 1141 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1142 | if (!mask) |
1143 | return 0; | |
1144 | switch (event) { | |
1145 | case CHP_VARY_OFF: | |
1146 | sch->opm &= ~mask; | |
1147 | sch->lpm &= ~mask; | |
585b954e SO |
1148 | if (cdev) |
1149 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1150 | io_subchannel_terminate_path(sch, mask); |
1151 | break; | |
1152 | case CHP_VARY_ON: | |
1153 | sch->opm |= mask; | |
1154 | sch->lpm |= mask; | |
585b954e SO |
1155 | if (cdev) |
1156 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1157 | io_subchannel_verify(sch); |
1158 | break; | |
1159 | case CHP_OFFLINE: | |
cdb912a4 | 1160 | if (cio_update_schib(sch)) |
c820de39 | 1161 | return -ENODEV; |
585b954e SO |
1162 | if (cdev) |
1163 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1164 | io_subchannel_terminate_path(sch, mask); |
1165 | break; | |
1166 | case CHP_ONLINE: | |
cdb912a4 SO |
1167 | if (cio_update_schib(sch)) |
1168 | return -ENODEV; | |
c820de39 | 1169 | sch->lpm |= mask & sch->opm; |
585b954e SO |
1170 | if (cdev) |
1171 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1172 | io_subchannel_verify(sch); |
1173 | break; | |
1174 | } | |
1175 | return 0; | |
1176 | } | |
1177 | ||
6e9a0f67 | 1178 | static void io_subchannel_quiesce(struct subchannel *sch) |
1da177e4 | 1179 | { |
1da177e4 LT |
1180 | struct ccw_device *cdev; |
1181 | int ret; | |
1182 | ||
56e6b796 | 1183 | spin_lock_irq(sch->lock); |
db6a6423 | 1184 | cdev = sch_get_cdev(sch); |
a8237fc4 | 1185 | if (cio_is_console(sch->schid)) |
56e6b796 | 1186 | goto out_unlock; |
1da177e4 | 1187 | if (!sch->schib.pmcw.ena) |
56e6b796 | 1188 | goto out_unlock; |
1da177e4 LT |
1189 | ret = cio_disable_subchannel(sch); |
1190 | if (ret != -EBUSY) | |
56e6b796 | 1191 | goto out_unlock; |
1da177e4 | 1192 | if (cdev->handler) |
56e6b796 SO |
1193 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); |
1194 | while (ret == -EBUSY) { | |
1195 | cdev->private->state = DEV_STATE_QUIESCE; | |
376ae475 | 1196 | cdev->private->iretry = 255; |
56e6b796 SO |
1197 | ret = ccw_device_cancel_halt_clear(cdev); |
1198 | if (ret == -EBUSY) { | |
1199 | ccw_device_set_timeout(cdev, HZ/10); | |
1200 | spin_unlock_irq(sch->lock); | |
1201 | wait_event(cdev->private->wait_q, | |
1202 | cdev->private->state != DEV_STATE_QUIESCE); | |
1203 | spin_lock_irq(sch->lock); | |
1204 | } | |
1205 | ret = cio_disable_subchannel(sch); | |
1da177e4 | 1206 | } |
56e6b796 SO |
1207 | out_unlock: |
1208 | spin_unlock_irq(sch->lock); | |
1da177e4 LT |
1209 | } |
1210 | ||
6e9a0f67 SO |
1211 | static void io_subchannel_shutdown(struct subchannel *sch) |
1212 | { | |
1213 | io_subchannel_quiesce(sch); | |
1214 | } | |
1215 | ||
c820de39 CH |
1216 | static int device_is_disconnected(struct ccw_device *cdev) |
1217 | { | |
1218 | if (!cdev) | |
1219 | return 0; | |
1220 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1221 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1222 | } | |
1223 | ||
1224 | static int recovery_check(struct device *dev, void *data) | |
1225 | { | |
1226 | struct ccw_device *cdev = to_ccwdev(dev); | |
55fb7347 | 1227 | struct subchannel *sch; |
c820de39 CH |
1228 | int *redo = data; |
1229 | ||
1230 | spin_lock_irq(cdev->ccwlock); | |
1231 | switch (cdev->private->state) { | |
55fb7347 SO |
1232 | case DEV_STATE_ONLINE: |
1233 | sch = to_subchannel(cdev->dev.parent); | |
1234 | if ((sch->schib.pmcw.pam & sch->opm) == sch->vpm) | |
1235 | break; | |
1236 | /* fall through */ | |
c820de39 CH |
1237 | case DEV_STATE_DISCONNECTED: |
1238 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1239 | cdev->private->dev_id.ssid, | |
1240 | cdev->private->dev_id.devno); | |
1241 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1242 | *redo = 1; | |
1243 | break; | |
1244 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1245 | *redo = 1; | |
1246 | break; | |
1247 | } | |
1248 | spin_unlock_irq(cdev->ccwlock); | |
1249 | ||
1250 | return 0; | |
1251 | } | |
1252 | ||
1253 | static void recovery_work_func(struct work_struct *unused) | |
1254 | { | |
1255 | int redo = 0; | |
1256 | ||
1257 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1258 | if (redo) { | |
1259 | spin_lock_irq(&recovery_lock); | |
1260 | if (!timer_pending(&recovery_timer)) { | |
1261 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1262 | recovery_phase++; | |
1263 | mod_timer(&recovery_timer, jiffies + | |
1264 | recovery_delay[recovery_phase] * HZ); | |
1265 | } | |
1266 | spin_unlock_irq(&recovery_lock); | |
1267 | } else | |
55fb7347 | 1268 | CIO_MSG_EVENT(3, "recovery: end\n"); |
c820de39 CH |
1269 | } |
1270 | ||
1271 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1272 | ||
846d0c6f | 1273 | static void recovery_func(struct timer_list *unused) |
c820de39 CH |
1274 | { |
1275 | /* | |
1276 | * We can't do our recovery in softirq context and it's not | |
1277 | * performance critical, so we schedule it. | |
1278 | */ | |
1279 | schedule_work(&recovery_work); | |
1280 | } | |
1281 | ||
55fb7347 | 1282 | void ccw_device_schedule_recovery(void) |
c820de39 CH |
1283 | { |
1284 | unsigned long flags; | |
1285 | ||
55fb7347 | 1286 | CIO_MSG_EVENT(3, "recovery: schedule\n"); |
c820de39 CH |
1287 | spin_lock_irqsave(&recovery_lock, flags); |
1288 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1289 | recovery_phase = 0; | |
1290 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1291 | } | |
1292 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1293 | } | |
1294 | ||
ecf5d9ef PO |
1295 | static int purge_fn(struct device *dev, void *data) |
1296 | { | |
1297 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1298 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1299 | |
1300 | spin_lock_irq(cdev->ccwlock); | |
37de53bb | 1301 | if (is_blacklisted(id->ssid, id->devno) && |
a2fc8485 PO |
1302 | (cdev->private->state == DEV_STATE_OFFLINE) && |
1303 | (atomic_cmpxchg(&cdev->private->onoff, 0, 1) == 0)) { | |
37de53bb PO |
1304 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, |
1305 | id->devno); | |
1306 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
a2fc8485 | 1307 | atomic_set(&cdev->private->onoff, 0); |
37de53bb | 1308 | } |
ecf5d9ef | 1309 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1310 | /* Abort loop in case of pending signal. */ |
1311 | if (signal_pending(current)) | |
1312 | return -EINTR; | |
1313 | ||
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | /** | |
1318 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1319 | * | |
1320 | * Unregister all ccw devices that are offline and on the blacklist. | |
1321 | */ | |
1322 | int ccw_purge_blacklisted(void) | |
1323 | { | |
1324 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1325 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1326 | return 0; | |
1327 | } | |
1328 | ||
6afcc775 | 1329 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1330 | { |
1331 | if (!cdev) | |
1332 | return; | |
1333 | ccw_device_set_timeout(cdev, 0); | |
1334 | cdev->private->flags.fake_irb = 0; | |
1335 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1336 | if (cdev->online) | |
1337 | ccw_device_schedule_recovery(); | |
1338 | } | |
1339 | ||
91c36919 PO |
1340 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1341 | { | |
1342 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1343 | ||
1344 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1345 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1346 | ccw_device_set_timeout(cdev, 0); |
1347 | cio_disable_subchannel(sch); | |
1348 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1349 | } | |
1350 | ||
5d6e6b6f PO |
1351 | enum io_sch_action { |
1352 | IO_SCH_UNREG, | |
1353 | IO_SCH_ORPH_UNREG, | |
1354 | IO_SCH_ATTACH, | |
1355 | IO_SCH_UNREG_ATTACH, | |
1356 | IO_SCH_ORPH_ATTACH, | |
1357 | IO_SCH_REPROBE, | |
1358 | IO_SCH_VERIFY, | |
1359 | IO_SCH_DISC, | |
1360 | IO_SCH_NOP, | |
1361 | }; | |
1362 | ||
1363 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1364 | { | |
1365 | struct ccw_device *cdev; | |
1366 | ||
1367 | cdev = sch_get_cdev(sch); | |
1368 | if (cio_update_schib(sch)) { | |
1369 | /* Not operational. */ | |
1370 | if (!cdev) | |
1371 | return IO_SCH_UNREG; | |
76e6fb4b | 1372 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1373 | return IO_SCH_UNREG; |
1374 | return IO_SCH_ORPH_UNREG; | |
1375 | } | |
1376 | /* Operational. */ | |
1377 | if (!cdev) | |
1378 | return IO_SCH_ATTACH; | |
1379 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
76e6fb4b | 1380 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1381 | return IO_SCH_UNREG_ATTACH; |
1382 | return IO_SCH_ORPH_ATTACH; | |
1383 | } | |
1384 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
76e6fb4b | 1385 | if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) |
5d6e6b6f PO |
1386 | return IO_SCH_UNREG; |
1387 | return IO_SCH_DISC; | |
1388 | } | |
1389 | if (device_is_disconnected(cdev)) | |
1390 | return IO_SCH_REPROBE; | |
31370f75 | 1391 | if (cdev->online && !cdev->private->flags.resuming) |
5d6e6b6f | 1392 | return IO_SCH_VERIFY; |
43d0be75 SO |
1393 | if (cdev->private->state == DEV_STATE_NOT_OPER) |
1394 | return IO_SCH_UNREG_ATTACH; | |
5d6e6b6f PO |
1395 | return IO_SCH_NOP; |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * io_subchannel_sch_event - process subchannel event | |
1400 | * @sch: subchannel | |
1401 | * @process: non-zero if function is called in process context | |
1402 | * | |
1403 | * An unspecified event occurred for this subchannel. Adjust data according | |
1404 | * to the current operational state of the subchannel and device. Return | |
1405 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1406 | * function should be called again in process context. | |
1407 | */ | |
1408 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1409 | { |
c820de39 | 1410 | unsigned long flags; |
c820de39 | 1411 | struct ccw_device *cdev; |
5d6e6b6f PO |
1412 | struct ccw_dev_id dev_id; |
1413 | enum io_sch_action action; | |
1414 | int rc = -EAGAIN; | |
c820de39 CH |
1415 | |
1416 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1417 | if (!device_is_registered(&sch->dev)) |
1418 | goto out_unlock; | |
390935ac PO |
1419 | if (work_pending(&sch->todo_work)) |
1420 | goto out_unlock; | |
37de53bb PO |
1421 | cdev = sch_get_cdev(sch); |
1422 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1423 | goto out_unlock; | |
5d6e6b6f PO |
1424 | action = sch_get_action(sch); |
1425 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1426 | sch->schid.ssid, sch->schid.sch_no, process, | |
1427 | action); | |
1428 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1429 | switch (action) { |
1430 | case IO_SCH_REPROBE: | |
1431 | /* Trigger device recognition. */ | |
1432 | ccw_device_trigger_reprobe(cdev); | |
1433 | rc = 0; | |
1434 | goto out_unlock; | |
1435 | case IO_SCH_VERIFY: | |
1436 | /* Trigger path verification. */ | |
1437 | io_subchannel_verify(sch); | |
1438 | rc = 0; | |
1439 | goto out_unlock; | |
1440 | case IO_SCH_DISC: | |
1441 | ccw_device_set_disconnected(cdev); | |
1442 | rc = 0; | |
1443 | goto out_unlock; | |
1444 | case IO_SCH_ORPH_UNREG: | |
1445 | case IO_SCH_ORPH_ATTACH: | |
1446 | ccw_device_set_disconnected(cdev); | |
1447 | break; | |
1448 | case IO_SCH_UNREG_ATTACH: | |
1449 | case IO_SCH_UNREG: | |
16d2ce27 SO |
1450 | if (!cdev) |
1451 | break; | |
1452 | if (cdev->private->state == DEV_STATE_SENSE_ID) { | |
1453 | /* | |
1454 | * Note: delayed work triggered by this event | |
1455 | * and repeated calls to sch_event are synchronized | |
1456 | * by the above check for work_pending(cdev). | |
1457 | */ | |
1458 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1459 | } else | |
5d6e6b6f PO |
1460 | ccw_device_set_notoper(cdev); |
1461 | break; | |
1462 | case IO_SCH_NOP: | |
1463 | rc = 0; | |
1464 | goto out_unlock; | |
1465 | default: | |
1466 | break; | |
c820de39 | 1467 | } |
5d6e6b6f PO |
1468 | spin_unlock_irqrestore(sch->lock, flags); |
1469 | /* All other actions require process context. */ | |
1470 | if (!process) | |
1471 | goto out; | |
1472 | /* Handle attached ccw device. */ | |
1473 | switch (action) { | |
1474 | case IO_SCH_ORPH_UNREG: | |
1475 | case IO_SCH_ORPH_ATTACH: | |
1476 | /* Move ccw device to orphanage. */ | |
1477 | rc = ccw_device_move_to_orph(cdev); | |
1478 | if (rc) | |
1479 | goto out; | |
c820de39 | 1480 | break; |
5d6e6b6f | 1481 | case IO_SCH_UNREG_ATTACH: |
3368ba25 | 1482 | spin_lock_irqsave(sch->lock, flags); |
74b6127e SO |
1483 | if (cdev->private->flags.resuming) { |
1484 | /* Device will be handled later. */ | |
1485 | rc = 0; | |
3368ba25 | 1486 | goto out_unlock; |
74b6127e | 1487 | } |
3368ba25 SO |
1488 | sch_set_cdev(sch, NULL); |
1489 | spin_unlock_irqrestore(sch->lock, flags); | |
5d6e6b6f | 1490 | /* Unregister ccw device. */ |
74b6127e | 1491 | ccw_device_unregister(cdev); |
c820de39 | 1492 | break; |
5d6e6b6f | 1493 | default: |
c820de39 CH |
1494 | break; |
1495 | } | |
5d6e6b6f | 1496 | /* Handle subchannel. */ |
c820de39 | 1497 | switch (action) { |
5d6e6b6f PO |
1498 | case IO_SCH_ORPH_UNREG: |
1499 | case IO_SCH_UNREG: | |
0d01bb89 SO |
1500 | if (!cdev || !cdev->private->flags.resuming) |
1501 | css_sch_device_unregister(sch); | |
c820de39 | 1502 | break; |
5d6e6b6f PO |
1503 | case IO_SCH_ORPH_ATTACH: |
1504 | case IO_SCH_UNREG_ATTACH: | |
1505 | case IO_SCH_ATTACH: | |
1506 | dev_id.ssid = sch->schid.ssid; | |
1507 | dev_id.devno = sch->schib.pmcw.dev; | |
1508 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1509 | if (!cdev) { | |
1510 | sch_create_and_recog_new_device(sch); | |
1511 | break; | |
1512 | } | |
1513 | rc = ccw_device_move_to_sch(cdev, sch); | |
1514 | if (rc) { | |
1515 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1516 | put_device(&cdev->dev); | |
1517 | goto out; | |
1518 | } | |
1519 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1520 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1521 | spin_unlock_irqrestore(sch->lock, flags); |
1522 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1523 | put_device(&cdev->dev); | |
91c36919 | 1524 | break; |
c820de39 CH |
1525 | default: |
1526 | break; | |
1527 | } | |
5d6e6b6f | 1528 | return 0; |
c820de39 | 1529 | |
5d6e6b6f PO |
1530 | out_unlock: |
1531 | spin_unlock_irqrestore(sch->lock, flags); | |
1532 | out: | |
1533 | return rc; | |
c820de39 CH |
1534 | } |
1535 | ||
137a14f4 SO |
1536 | static void ccw_device_set_int_class(struct ccw_device *cdev) |
1537 | { | |
1538 | struct ccw_driver *cdrv = cdev->drv; | |
1539 | ||
1540 | /* Note: we interpret class 0 in this context as an uninitialized | |
1541 | * field since it translates to a non-I/O interrupt class. */ | |
1542 | if (cdrv->int_class != 0) | |
1543 | cdev->private->int_class = cdrv->int_class; | |
1544 | else | |
1545 | cdev->private->int_class = IRQIO_CIO; | |
1546 | } | |
1547 | ||
1da177e4 | 1548 | #ifdef CONFIG_CCW_CONSOLE |
1e532096 | 1549 | int __init ccw_device_enable_console(struct ccw_device *cdev) |
1da177e4 | 1550 | { |
1e532096 | 1551 | struct subchannel *sch = to_subchannel(cdev->dev.parent); |
1da177e4 LT |
1552 | int rc; |
1553 | ||
1e532096 SO |
1554 | if (!cdev->drv || !cdev->handler) |
1555 | return -EINVAL; | |
1556 | ||
0ae7a7b2 | 1557 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1558 | rc = cio_commit_config(sch); |
1559 | if (rc) | |
1560 | return rc; | |
0ae7a7b2 | 1561 | sch->driver = &io_subchannel_driver; |
736b5db8 | 1562 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1563 | /* Now wait for the async. recognition to come to an end. */ |
1564 | spin_lock_irq(cdev->ccwlock); | |
1565 | while (!dev_fsm_final_state(cdev)) | |
188561a4 SO |
1566 | ccw_device_wait_idle(cdev); |
1567 | ||
afdfed0f SO |
1568 | /* Hold on to an extra reference while device is online. */ |
1569 | get_device(&cdev->dev); | |
1570 | rc = ccw_device_online(cdev); | |
1571 | if (rc) | |
1da177e4 | 1572 | goto out_unlock; |
afdfed0f | 1573 | |
1da177e4 | 1574 | while (!dev_fsm_final_state(cdev)) |
188561a4 SO |
1575 | ccw_device_wait_idle(cdev); |
1576 | ||
afdfed0f SO |
1577 | if (cdev->private->state == DEV_STATE_ONLINE) |
1578 | cdev->online = 1; | |
1579 | else | |
1580 | rc = -EIO; | |
1da177e4 LT |
1581 | out_unlock: |
1582 | spin_unlock_irq(cdev->ccwlock); | |
afdfed0f SO |
1583 | if (rc) /* Give up online reference since onlining failed. */ |
1584 | put_device(&cdev->dev); | |
736b5db8 | 1585 | return rc; |
1da177e4 LT |
1586 | } |
1587 | ||
1e532096 | 1588 | struct ccw_device * __init ccw_device_create_console(struct ccw_driver *drv) |
1da177e4 | 1589 | { |
863fc849 | 1590 | struct io_subchannel_private *io_priv; |
afdfed0f | 1591 | struct ccw_device *cdev; |
1da177e4 | 1592 | struct subchannel *sch; |
1da177e4 | 1593 | |
1da177e4 | 1594 | sch = cio_probe_console(); |
afdfed0f SO |
1595 | if (IS_ERR(sch)) |
1596 | return ERR_CAST(sch); | |
863fc849 SO |
1597 | |
1598 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); | |
1599 | if (!io_priv) { | |
1600 | put_device(&sch->dev); | |
1601 | return ERR_PTR(-ENOMEM); | |
1602 | } | |
2c3e7e15 | 1603 | set_io_private(sch, io_priv); |
afdfed0f SO |
1604 | cdev = io_subchannel_create_ccwdev(sch); |
1605 | if (IS_ERR(cdev)) { | |
1606 | put_device(&sch->dev); | |
1607 | kfree(io_priv); | |
1608 | return cdev; | |
1609 | } | |
2253e8d7 | 1610 | cdev->drv = drv; |
137a14f4 | 1611 | ccw_device_set_int_class(cdev); |
afdfed0f | 1612 | return cdev; |
1da177e4 | 1613 | } |
1f4e7eda | 1614 | |
1e532096 SO |
1615 | void __init ccw_device_destroy_console(struct ccw_device *cdev) |
1616 | { | |
1617 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1618 | struct io_subchannel_private *io_priv = to_io_private(sch); | |
1619 | ||
1620 | set_io_private(sch, NULL); | |
1621 | put_device(&sch->dev); | |
1622 | put_device(&cdev->dev); | |
1623 | kfree(io_priv); | |
1624 | } | |
1625 | ||
188561a4 SO |
1626 | /** |
1627 | * ccw_device_wait_idle() - busy wait for device to become idle | |
1628 | * @cdev: ccw device | |
1629 | * | |
1630 | * Poll until activity control is zero, that is, no function or data | |
1631 | * transfer is pending/active. | |
1632 | * Called with device lock being held. | |
1633 | */ | |
1634 | void ccw_device_wait_idle(struct ccw_device *cdev) | |
1635 | { | |
1636 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1637 | ||
1638 | while (1) { | |
1639 | cio_tsch(sch); | |
1640 | if (sch->schib.scsw.cmd.actl == 0) | |
1641 | break; | |
1642 | udelay_simple(100); | |
1643 | } | |
1644 | } | |
1645 | ||
6664845c MS |
1646 | static int ccw_device_pm_restore(struct device *dev); |
1647 | ||
f10ccca7 | 1648 | int ccw_device_force_console(struct ccw_device *cdev) |
6664845c | 1649 | { |
f10ccca7 | 1650 | return ccw_device_pm_restore(&cdev->dev); |
6664845c MS |
1651 | } |
1652 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1653 | #endif |
1654 | ||
1655 | /* | |
1656 | * get ccw_device matching the busid, but only if owned by cdrv | |
1657 | */ | |
b0744bd2 CH |
1658 | static int |
1659 | __ccwdev_check_busid(struct device *dev, void *id) | |
1660 | { | |
1661 | char *bus_id; | |
1662 | ||
12975aef | 1663 | bus_id = id; |
b0744bd2 | 1664 | |
98df67b3 | 1665 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1666 | } |
1667 | ||
1668 | ||
b2ffd8e9 CH |
1669 | /** |
1670 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1671 | * @cdrv: driver the device is owned by | |
1672 | * @bus_id: bus id of the device to be searched | |
1673 | * | |
1674 | * This function searches all devices owned by @cdrv for a device with a bus | |
1675 | * id matching @bus_id. | |
1676 | * Returns: | |
1677 | * If a match is found, its reference count of the found device is increased | |
1678 | * and it is returned; else %NULL is returned. | |
1679 | */ | |
1680 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1681 | const char *bus_id) | |
1da177e4 | 1682 | { |
b0744bd2 | 1683 | struct device *dev; |
1da177e4 | 1684 | |
9f30ea95 | 1685 | dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id, |
b0744bd2 | 1686 | __ccwdev_check_busid); |
1da177e4 | 1687 | |
d2c993d8 | 1688 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1689 | } |
1690 | ||
1691 | /************************** device driver handling ************************/ | |
1692 | ||
1693 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1694 | * and release methods are initially very similar to the device_driver | |
1695 | * implementations, with the difference that they have ccw_device | |
1696 | * arguments. | |
1697 | * | |
1698 | * A ccw driver also contains the information that is needed for | |
1699 | * device matching. | |
1700 | */ | |
1701 | static int | |
1702 | ccw_device_probe (struct device *dev) | |
1703 | { | |
1704 | struct ccw_device *cdev = to_ccwdev(dev); | |
1705 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1706 | int ret; | |
1707 | ||
1708 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
137a14f4 | 1709 | ccw_device_set_int_class(cdev); |
1da177e4 | 1710 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; |
1da177e4 | 1711 | if (ret) { |
d2c993d8 | 1712 | cdev->drv = NULL; |
420f42ec | 1713 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1714 | return ret; |
1715 | } | |
1716 | ||
1717 | return 0; | |
1718 | } | |
1719 | ||
74bd0d85 | 1720 | static int ccw_device_remove(struct device *dev) |
1da177e4 LT |
1721 | { |
1722 | struct ccw_device *cdev = to_ccwdev(dev); | |
1723 | struct ccw_driver *cdrv = cdev->drv; | |
1724 | int ret; | |
1725 | ||
1da177e4 LT |
1726 | if (cdrv->remove) |
1727 | cdrv->remove(cdev); | |
74bd0d85 SO |
1728 | |
1729 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 LT |
1730 | if (cdev->online) { |
1731 | cdev->online = 0; | |
1da177e4 LT |
1732 | ret = ccw_device_offline(cdev); |
1733 | spin_unlock_irq(cdev->ccwlock); | |
1734 | if (ret == 0) | |
1735 | wait_event(cdev->private->wait_q, | |
1736 | dev_fsm_final_state(cdev)); | |
1737 | else | |
139b83dd | 1738 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1739 | "device 0.%x.%04x\n", |
1740 | ret, cdev->private->dev_id.ssid, | |
1741 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1742 | /* Give up reference obtained in ccw_device_set_online(). */ |
1743 | put_device(&cdev->dev); | |
74bd0d85 | 1744 | spin_lock_irq(cdev->ccwlock); |
1da177e4 LT |
1745 | } |
1746 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1747 | cdev->drv = NULL; |
420f42ec | 1748 | cdev->private->int_class = IRQIO_CIO; |
74bd0d85 | 1749 | spin_unlock_irq(cdev->ccwlock); |
a6ef1565 SO |
1750 | __disable_cmf(cdev); |
1751 | ||
1da177e4 LT |
1752 | return 0; |
1753 | } | |
1754 | ||
958974fb CH |
1755 | static void ccw_device_shutdown(struct device *dev) |
1756 | { | |
1757 | struct ccw_device *cdev; | |
1758 | ||
1759 | cdev = to_ccwdev(dev); | |
1760 | if (cdev->drv && cdev->drv->shutdown) | |
1761 | cdev->drv->shutdown(cdev); | |
1bc6664b | 1762 | __disable_cmf(cdev); |
958974fb CH |
1763 | } |
1764 | ||
823d494a SO |
1765 | static int ccw_device_pm_prepare(struct device *dev) |
1766 | { | |
1767 | struct ccw_device *cdev = to_ccwdev(dev); | |
1768 | ||
37de53bb | 1769 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1770 | return -EAGAIN; |
1771 | /* Fail while device is being set online/offline. */ | |
1772 | if (atomic_read(&cdev->private->onoff)) | |
1773 | return -EAGAIN; | |
1774 | ||
1775 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1776 | return cdev->drv->prepare(cdev); | |
1777 | ||
1778 | return 0; | |
1779 | } | |
1780 | ||
1781 | static void ccw_device_pm_complete(struct device *dev) | |
1782 | { | |
1783 | struct ccw_device *cdev = to_ccwdev(dev); | |
1784 | ||
1785 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1786 | cdev->drv->complete(cdev); | |
1787 | } | |
1788 | ||
1789 | static int ccw_device_pm_freeze(struct device *dev) | |
1790 | { | |
1791 | struct ccw_device *cdev = to_ccwdev(dev); | |
1792 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1793 | int ret, cm_enabled; | |
1794 | ||
1795 | /* Fail suspend while device is in transistional state. */ | |
1796 | if (!dev_fsm_final_state(cdev)) | |
1797 | return -EAGAIN; | |
1798 | if (!cdev->online) | |
1799 | return 0; | |
1800 | if (cdev->drv && cdev->drv->freeze) { | |
1801 | ret = cdev->drv->freeze(cdev); | |
1802 | if (ret) | |
1803 | return ret; | |
1804 | } | |
1805 | ||
1806 | spin_lock_irq(sch->lock); | |
1807 | cm_enabled = cdev->private->cmb != NULL; | |
1808 | spin_unlock_irq(sch->lock); | |
1809 | if (cm_enabled) { | |
1810 | /* Don't have the css write on memory. */ | |
1811 | ret = ccw_set_cmf(cdev, 0); | |
1812 | if (ret) | |
1813 | return ret; | |
1814 | } | |
1815 | /* From here on, disallow device driver I/O. */ | |
1816 | spin_lock_irq(sch->lock); | |
1817 | ret = cio_disable_subchannel(sch); | |
1818 | spin_unlock_irq(sch->lock); | |
1819 | ||
1820 | return ret; | |
1821 | } | |
1822 | ||
1823 | static int ccw_device_pm_thaw(struct device *dev) | |
1824 | { | |
1825 | struct ccw_device *cdev = to_ccwdev(dev); | |
1826 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1827 | int ret, cm_enabled; | |
1828 | ||
1829 | if (!cdev->online) | |
1830 | return 0; | |
1831 | ||
1832 | spin_lock_irq(sch->lock); | |
1833 | /* Allow device driver I/O again. */ | |
1834 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1835 | cm_enabled = cdev->private->cmb != NULL; | |
1836 | spin_unlock_irq(sch->lock); | |
1837 | if (ret) | |
1838 | return ret; | |
1839 | ||
1840 | if (cm_enabled) { | |
1841 | ret = ccw_set_cmf(cdev, 1); | |
1842 | if (ret) | |
1843 | return ret; | |
1844 | } | |
1845 | ||
1846 | if (cdev->drv && cdev->drv->thaw) | |
1847 | ret = cdev->drv->thaw(cdev); | |
1848 | ||
1849 | return ret; | |
1850 | } | |
1851 | ||
1852 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1853 | { | |
1854 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a | 1855 | |
0d01bb89 SO |
1856 | spin_lock_irq(sch->lock); |
1857 | if (cio_is_console(sch->schid)) { | |
1858 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1859 | goto out_unlock; | |
1860 | } | |
823d494a SO |
1861 | /* |
1862 | * While we were sleeping, devices may have gone or become | |
1863 | * available again. Kick re-detection. | |
1864 | */ | |
823d494a | 1865 | cdev->private->flags.resuming = 1; |
b17295e6 | 1866 | cdev->private->path_new_mask = LPM_ANYPATH; |
817e5000 | 1867 | css_sched_sch_todo(sch, SCH_TODO_EVAL); |
0d01bb89 | 1868 | spin_unlock_irq(sch->lock); |
817e5000 | 1869 | css_wait_for_slow_path(); |
0d01bb89 SO |
1870 | |
1871 | /* cdev may have been moved to a different subchannel. */ | |
1872 | sch = to_subchannel(cdev->dev.parent); | |
1873 | spin_lock_irq(sch->lock); | |
1874 | if (cdev->private->state != DEV_STATE_ONLINE && | |
1875 | cdev->private->state != DEV_STATE_OFFLINE) | |
1876 | goto out_unlock; | |
1877 | ||
736b5db8 | 1878 | ccw_device_recognition(cdev); |
823d494a | 1879 | spin_unlock_irq(sch->lock); |
823d494a SO |
1880 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1881 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
0d01bb89 SO |
1882 | spin_lock_irq(sch->lock); |
1883 | ||
1884 | out_unlock: | |
823d494a | 1885 | cdev->private->flags.resuming = 0; |
0d01bb89 | 1886 | spin_unlock_irq(sch->lock); |
823d494a SO |
1887 | } |
1888 | ||
1889 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1890 | { | |
1891 | cdev->private->state = DEV_STATE_BOXED; | |
76e6fb4b | 1892 | if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK) |
823d494a | 1893 | return 0; |
37de53bb | 1894 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1895 | return -ENODEV; |
1896 | } | |
1897 | ||
1898 | static int resume_handle_disc(struct ccw_device *cdev) | |
1899 | { | |
1900 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
76e6fb4b | 1901 | if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK) |
823d494a | 1902 | return 0; |
37de53bb | 1903 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1904 | return -ENODEV; |
1905 | } | |
1906 | ||
1907 | static int ccw_device_pm_restore(struct device *dev) | |
1908 | { | |
1909 | struct ccw_device *cdev = to_ccwdev(dev); | |
0d01bb89 SO |
1910 | struct subchannel *sch; |
1911 | int ret = 0; | |
823d494a SO |
1912 | |
1913 | __ccw_device_pm_restore(cdev); | |
0d01bb89 | 1914 | sch = to_subchannel(cdev->dev.parent); |
823d494a | 1915 | spin_lock_irq(sch->lock); |
0d01bb89 | 1916 | if (cio_is_console(sch->schid)) |
823d494a | 1917 | goto out_restore; |
0d01bb89 | 1918 | |
823d494a SO |
1919 | /* check recognition results */ |
1920 | switch (cdev->private->state) { | |
1921 | case DEV_STATE_OFFLINE: | |
0d01bb89 SO |
1922 | case DEV_STATE_ONLINE: |
1923 | cdev->private->flags.donotify = 0; | |
823d494a SO |
1924 | break; |
1925 | case DEV_STATE_BOXED: | |
1926 | ret = resume_handle_boxed(cdev); | |
823d494a | 1927 | if (ret) |
0d01bb89 | 1928 | goto out_unlock; |
823d494a | 1929 | goto out_restore; |
823d494a | 1930 | default: |
0d01bb89 SO |
1931 | ret = resume_handle_disc(cdev); |
1932 | if (ret) | |
1933 | goto out_unlock; | |
1934 | goto out_restore; | |
823d494a SO |
1935 | } |
1936 | /* check if the device type has changed */ | |
1937 | if (!ccw_device_test_sense_data(cdev)) { | |
1938 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1939 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1940 | ret = -ENODEV; |
1941 | goto out_unlock; | |
1942 | } | |
0d01bb89 | 1943 | if (!cdev->online) |
823d494a | 1944 | goto out_unlock; |
823d494a | 1945 | |
0d01bb89 SO |
1946 | if (ccw_device_online(cdev)) { |
1947 | ret = resume_handle_disc(cdev); | |
1948 | if (ret) | |
1949 | goto out_unlock; | |
1950 | goto out_restore; | |
1951 | } | |
823d494a | 1952 | spin_unlock_irq(sch->lock); |
823d494a | 1953 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
0d01bb89 SO |
1954 | spin_lock_irq(sch->lock); |
1955 | ||
1956 | if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) { | |
1957 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1958 | ret = -ENODEV; | |
1959 | goto out_unlock; | |
823d494a | 1960 | } |
0d01bb89 SO |
1961 | |
1962 | /* reenable cmf, if needed */ | |
1963 | if (cdev->private->cmb) { | |
1964 | spin_unlock_irq(sch->lock); | |
823d494a | 1965 | ret = ccw_set_cmf(cdev, 1); |
0d01bb89 | 1966 | spin_lock_irq(sch->lock); |
823d494a | 1967 | if (ret) { |
f014824e SO |
1968 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1969 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1970 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1971 | ret = 0; |
1972 | } | |
1973 | } | |
1974 | ||
1975 | out_restore: | |
0d01bb89 | 1976 | spin_unlock_irq(sch->lock); |
823d494a SO |
1977 | if (cdev->online && cdev->drv && cdev->drv->restore) |
1978 | ret = cdev->drv->restore(cdev); | |
823d494a SO |
1979 | return ret; |
1980 | ||
823d494a SO |
1981 | out_unlock: |
1982 | spin_unlock_irq(sch->lock); | |
1983 | return ret; | |
1984 | } | |
1985 | ||
47145210 | 1986 | static const struct dev_pm_ops ccw_pm_ops = { |
823d494a SO |
1987 | .prepare = ccw_device_pm_prepare, |
1988 | .complete = ccw_device_pm_complete, | |
1989 | .freeze = ccw_device_pm_freeze, | |
1990 | .thaw = ccw_device_pm_thaw, | |
1991 | .restore = ccw_device_pm_restore, | |
1992 | }; | |
1993 | ||
d5ab5276 | 1994 | static struct bus_type ccw_bus_type = { |
8bbace7e CH |
1995 | .name = "ccw", |
1996 | .match = ccw_bus_match, | |
1997 | .uevent = ccw_uevent, | |
1998 | .probe = ccw_device_probe, | |
1999 | .remove = ccw_device_remove, | |
958974fb | 2000 | .shutdown = ccw_device_shutdown, |
823d494a | 2001 | .pm = &ccw_pm_ops, |
8bbace7e CH |
2002 | }; |
2003 | ||
b2ffd8e9 CH |
2004 | /** |
2005 | * ccw_driver_register() - register a ccw driver | |
2006 | * @cdriver: driver to be registered | |
2007 | * | |
2008 | * This function is mainly a wrapper around driver_register(). | |
2009 | * Returns: | |
2010 | * %0 on success and a negative error value on failure. | |
2011 | */ | |
2012 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2013 | { |
2014 | struct device_driver *drv = &cdriver->driver; | |
2015 | ||
2016 | drv->bus = &ccw_bus_type; | |
1da177e4 LT |
2017 | |
2018 | return driver_register(drv); | |
2019 | } | |
2020 | ||
b2ffd8e9 CH |
2021 | /** |
2022 | * ccw_driver_unregister() - deregister a ccw driver | |
2023 | * @cdriver: driver to be deregistered | |
2024 | * | |
2025 | * This function is mainly a wrapper around driver_unregister(). | |
2026 | */ | |
2027 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2028 | { |
2029 | driver_unregister(&cdriver->driver); | |
2030 | } | |
2031 | ||
37de53bb PO |
2032 | static void ccw_device_todo(struct work_struct *work) |
2033 | { | |
2034 | struct ccw_device_private *priv; | |
2035 | struct ccw_device *cdev; | |
2036 | struct subchannel *sch; | |
2037 | enum cdev_todo todo; | |
2038 | ||
2039 | priv = container_of(work, struct ccw_device_private, todo_work); | |
2040 | cdev = priv->cdev; | |
2041 | sch = to_subchannel(cdev->dev.parent); | |
2042 | /* Find out todo. */ | |
2043 | spin_lock_irq(cdev->ccwlock); | |
2044 | todo = priv->todo; | |
2045 | priv->todo = CDEV_TODO_NOTHING; | |
2046 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
2047 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
2048 | spin_unlock_irq(cdev->ccwlock); | |
2049 | /* Perform todo. */ | |
2050 | switch (todo) { | |
2051 | case CDEV_TODO_ENABLE_CMF: | |
2052 | cmf_reenable(cdev); | |
2053 | break; | |
2054 | case CDEV_TODO_REBIND: | |
2055 | ccw_device_do_unbind_bind(cdev); | |
2056 | break; | |
2057 | case CDEV_TODO_REGISTER: | |
2058 | io_subchannel_register(cdev); | |
2059 | break; | |
2060 | case CDEV_TODO_UNREG_EVAL: | |
2061 | if (!sch_is_pseudo_sch(sch)) | |
2062 | css_schedule_eval(sch->schid); | |
2063 | /* fall-through */ | |
2064 | case CDEV_TODO_UNREG: | |
2065 | if (sch_is_pseudo_sch(sch)) | |
2066 | ccw_device_unregister(cdev); | |
2067 | else | |
2068 | ccw_device_call_sch_unregister(cdev); | |
2069 | break; | |
2070 | default: | |
2071 | break; | |
2072 | } | |
2073 | /* Release workqueue ref. */ | |
2074 | put_device(&cdev->dev); | |
2075 | } | |
2076 | ||
2077 | /** | |
2078 | * ccw_device_sched_todo - schedule ccw device operation | |
2079 | * @cdev: ccw device | |
2080 | * @todo: todo | |
2081 | * | |
2082 | * Schedule the operation identified by @todo to be performed on the slow path | |
2083 | * workqueue. Do nothing if another operation with higher priority is already | |
2084 | * scheduled. Needs to be called with ccwdev lock held. | |
2085 | */ | |
2086 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2087 | { | |
2088 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2089 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2090 | todo); | |
2091 | if (cdev->private->todo >= todo) | |
2092 | return; | |
2093 | cdev->private->todo = todo; | |
2094 | /* Get workqueue ref. */ | |
2095 | if (!get_device(&cdev->dev)) | |
2096 | return; | |
be5d3823 | 2097 | if (!queue_work(cio_work_q, &cdev->private->todo_work)) { |
37de53bb PO |
2098 | /* Already queued, release workqueue ref. */ |
2099 | put_device(&cdev->dev); | |
2100 | } | |
2101 | } | |
2102 | ||
fd0457a6 ME |
2103 | /** |
2104 | * ccw_device_siosl() - initiate logging | |
2105 | * @cdev: ccw device | |
2106 | * | |
2107 | * This function is used to invoke model-dependent logging within the channel | |
2108 | * subsystem. | |
2109 | */ | |
2110 | int ccw_device_siosl(struct ccw_device *cdev) | |
2111 | { | |
2112 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2113 | ||
2114 | return chsc_siosl(sch->schid); | |
2115 | } | |
2116 | EXPORT_SYMBOL_GPL(ccw_device_siosl); | |
2117 | ||
1da177e4 LT |
2118 | EXPORT_SYMBOL(ccw_device_set_online); |
2119 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2120 | EXPORT_SYMBOL(ccw_driver_register); | |
2121 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2122 | EXPORT_SYMBOL(get_ccwdev_by_busid); |