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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
1da177e4 | 4 | * |
c820de39 | 5 | * Copyright IBM Corp. 2002,2008 |
1da177e4 | 6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
4ce3b30c | 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
9 | */ | |
a7ae2c02 PO |
10 | |
11 | #define KMSG_COMPONENT "cio" | |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
1da177e4 LT |
14 | #include <linux/module.h> |
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> | |
90ab1336 | 23 | #include <linux/timer.h> |
de400d6b | 24 | #include <linux/kernel_stat.h> |
1da177e4 LT |
25 | |
26 | #include <asm/ccwdev.h> | |
27 | #include <asm/cio.h> | |
4e57b681 | 28 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 29 | #include <asm/cmb.h> |
3a3fc29a | 30 | #include <asm/isc.h> |
1da177e4 | 31 | |
0ae7a7b2 | 32 | #include "chp.h" |
1da177e4 | 33 | #include "cio.h" |
d7b5a4c9 | 34 | #include "cio_debug.h" |
1da177e4 LT |
35 | #include "css.h" |
36 | #include "device.h" | |
37 | #include "ioasm.h" | |
cd6b4f27 | 38 | #include "io_sch.h" |
ecf5d9ef | 39 | #include "blacklist.h" |
fd0457a6 | 40 | #include "chsc.h" |
1da177e4 | 41 | |
90ab1336 | 42 | static struct timer_list recovery_timer; |
486d0a00 | 43 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
44 | static int recovery_phase; |
45 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
46 | ||
1da177e4 LT |
47 | /******************* bus type handling ***********************/ |
48 | ||
49 | /* The Linux driver model distinguishes between a bus type and | |
50 | * the bus itself. Of course we only have one channel | |
51 | * subsystem driver and one channel system per machine, but | |
52 | * we still use the abstraction. T.R. says it's a good idea. */ | |
53 | static int | |
54 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
55 | { | |
56 | struct ccw_device *cdev = to_ccwdev(dev); | |
57 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
58 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
59 | ||
60 | if (!ids) | |
61 | return 0; | |
62 | ||
63 | found = ccw_device_id_match(ids, &cdev->id); | |
64 | if (!found) | |
65 | return 0; | |
66 | ||
67 | cdev->id.driver_info = found->driver_info; | |
68 | ||
69 | return 1; | |
70 | } | |
71 | ||
db0c2d59 PO |
72 | /* Store modalias string delimited by prefix/suffix string into buffer with |
73 | * specified size. Return length of resulting string (excluding trailing '\0') | |
74 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 75 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 76 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 77 | { |
db0c2d59 | 78 | int len; |
1da177e4 | 79 | |
cfbe9bb2 | 80 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
81 | if (len > size) |
82 | return len; | |
83 | buf += len; | |
84 | size -= len; | |
1da177e4 | 85 | |
db0c2d59 PO |
86 | if (id->dev_type != 0) |
87 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
88 | id->dev_model, suffix); | |
89 | else | |
90 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 91 | |
db0c2d59 PO |
92 | return len; |
93 | } | |
94 | ||
95 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
96 | * non-zero otherwise. */ | |
7eff2e7a | 97 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
98 | { |
99 | struct ccw_device *cdev = to_ccwdev(dev); | |
100 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
101 | int ret; |
102 | char modalias_buf[30]; | |
1da177e4 | 103 | |
db0c2d59 | 104 | /* CU_TYPE= */ |
7eff2e7a | 105 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
106 | if (ret) |
107 | return ret; | |
db0c2d59 PO |
108 | |
109 | /* CU_MODEL= */ | |
7eff2e7a | 110 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
111 | if (ret) |
112 | return ret; | |
1da177e4 LT |
113 | |
114 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 115 | /* DEV_TYPE= */ |
7eff2e7a | 116 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
117 | if (ret) |
118 | return ret; | |
1da177e4 | 119 | |
db0c2d59 | 120 | /* DEV_MODEL= */ |
7eff2e7a | 121 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
122 | if (ret) |
123 | return ret; | |
db0c2d59 PO |
124 | |
125 | /* MODALIAS= */ | |
cfbe9bb2 | 126 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
127 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
128 | return ret; | |
1da177e4 LT |
129 | } |
130 | ||
d5ab5276 | 131 | static struct bus_type ccw_bus_type; |
1da177e4 | 132 | |
602b20f2 CH |
133 | static void io_subchannel_irq(struct subchannel *); |
134 | static int io_subchannel_probe(struct subchannel *); | |
135 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 136 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 137 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
138 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
139 | int); | |
8ea7f559 | 140 | static void recovery_func(unsigned long data); |
8ea7f559 SO |
141 | wait_queue_head_t ccw_device_init_wq; |
142 | atomic_t ccw_device_init_count; | |
1da177e4 | 143 | |
f08adc00 CH |
144 | static struct css_device_id io_subchannel_ids[] = { |
145 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
146 | { /* end of list */ }, | |
147 | }; | |
148 | MODULE_DEVICE_TABLE(css, io_subchannel_ids); | |
149 | ||
93a27592 CH |
150 | static int io_subchannel_prepare(struct subchannel *sch) |
151 | { | |
152 | struct ccw_device *cdev; | |
153 | /* | |
154 | * Don't allow suspend while a ccw device registration | |
155 | * is still outstanding. | |
156 | */ | |
157 | cdev = sch_get_cdev(sch); | |
158 | if (cdev && !device_is_registered(&cdev->dev)) | |
159 | return -EAGAIN; | |
160 | return 0; | |
161 | } | |
162 | ||
b4c70721 | 163 | static int io_subchannel_settle(void) |
8ea7f559 | 164 | { |
b4c70721 SO |
165 | int ret; |
166 | ||
167 | ret = wait_event_interruptible(ccw_device_init_wq, | |
168 | atomic_read(&ccw_device_init_count) == 0); | |
169 | if (ret) | |
170 | return -EINTR; | |
be5d3823 | 171 | flush_workqueue(cio_work_q); |
b4c70721 | 172 | return 0; |
8ea7f559 SO |
173 | } |
174 | ||
f7e5d67c | 175 | static struct css_driver io_subchannel_driver = { |
e6aed122 SO |
176 | .drv = { |
177 | .owner = THIS_MODULE, | |
178 | .name = "io_subchannel", | |
179 | }, | |
f08adc00 | 180 | .subchannel_type = io_subchannel_ids, |
1da177e4 | 181 | .irq = io_subchannel_irq, |
c820de39 CH |
182 | .sch_event = io_subchannel_sch_event, |
183 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
184 | .probe = io_subchannel_probe, |
185 | .remove = io_subchannel_remove, | |
186 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 187 | .prepare = io_subchannel_prepare, |
8ea7f559 | 188 | .settle = io_subchannel_settle, |
1da177e4 LT |
189 | }; |
190 | ||
2f17644d | 191 | int __init io_subchannel_init(void) |
1da177e4 LT |
192 | { |
193 | int ret; | |
194 | ||
195 | init_waitqueue_head(&ccw_device_init_wq); | |
196 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 197 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 | 198 | |
be5d3823 SO |
199 | ret = bus_register(&ccw_bus_type); |
200 | if (ret) | |
201 | return ret; | |
25b7bb58 CH |
202 | ret = css_driver_register(&io_subchannel_driver); |
203 | if (ret) | |
be5d3823 | 204 | bus_unregister(&ccw_bus_type); |
1da177e4 | 205 | |
1da177e4 LT |
206 | return ret; |
207 | } | |
208 | ||
1da177e4 LT |
209 | |
210 | /************************ device handling **************************/ | |
211 | ||
212 | /* | |
213 | * A ccw_device has some interfaces in sysfs in addition to the | |
214 | * standard ones. | |
215 | * The following entries are designed to export the information which | |
216 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
217 | * are obvious, so they don't have an entry :) | |
218 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
219 | */ | |
220 | static ssize_t | |
3fd3c0a5 | 221 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
222 | { |
223 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 224 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
225 | ssize_t ret = 0; |
226 | int chp; | |
7ad6a249 PO |
227 | int mask; |
228 | ||
229 | for (chp = 0; chp < 8; chp++) { | |
230 | mask = 0x80 >> chp; | |
231 | if (ssd->path_mask & mask) | |
232 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
233 | else | |
234 | ret += sprintf(buf + ret, "00 "); | |
235 | } | |
1da177e4 LT |
236 | ret += sprintf (buf+ret, "\n"); |
237 | return min((ssize_t)PAGE_SIZE, ret); | |
238 | } | |
239 | ||
240 | static ssize_t | |
3fd3c0a5 | 241 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
242 | { |
243 | struct subchannel *sch = to_subchannel(dev); | |
244 | struct pmcw *pmcw = &sch->schib.pmcw; | |
245 | ||
246 | return sprintf (buf, "%02x %02x %02x\n", | |
247 | pmcw->pim, pmcw->pam, pmcw->pom); | |
248 | } | |
249 | ||
250 | static ssize_t | |
3fd3c0a5 | 251 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
252 | { |
253 | struct ccw_device *cdev = to_ccwdev(dev); | |
254 | struct ccw_device_id *id = &(cdev->id); | |
255 | ||
256 | if (id->dev_type != 0) | |
257 | return sprintf(buf, "%04x/%02x\n", | |
258 | id->dev_type, id->dev_model); | |
259 | else | |
260 | return sprintf(buf, "n/a\n"); | |
261 | } | |
262 | ||
263 | static ssize_t | |
3fd3c0a5 | 264 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
265 | { |
266 | struct ccw_device *cdev = to_ccwdev(dev); | |
267 | struct ccw_device_id *id = &(cdev->id); | |
268 | ||
269 | return sprintf(buf, "%04x/%02x\n", | |
270 | id->cu_type, id->cu_model); | |
271 | } | |
272 | ||
f1fc78a8 BB |
273 | static ssize_t |
274 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
275 | { | |
276 | struct ccw_device *cdev = to_ccwdev(dev); | |
277 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 278 | int len; |
f1fc78a8 | 279 | |
086a6c62 | 280 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
281 | |
282 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
283 | } |
284 | ||
1da177e4 | 285 | static ssize_t |
3fd3c0a5 | 286 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
287 | { |
288 | struct ccw_device *cdev = to_ccwdev(dev); | |
289 | ||
290 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
291 | } | |
292 | ||
d7b5a4c9 CH |
293 | int ccw_device_is_orphan(struct ccw_device *cdev) |
294 | { | |
295 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
296 | } | |
297 | ||
ef99516c | 298 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 299 | { |
7d253b9a | 300 | if (device_is_registered(&cdev->dev)) { |
24a1872d | 301 | /* Undo device_add(). */ |
ef99516c | 302 | device_del(&cdev->dev); |
24a1872d SO |
303 | } |
304 | if (cdev->private->flags.initialized) { | |
305 | cdev->private->flags.initialized = 0; | |
3b554a14 SO |
306 | /* Release reference from device_initialize(). */ |
307 | put_device(&cdev->dev); | |
308 | } | |
7674da77 CH |
309 | } |
310 | ||
d40f7b75 SO |
311 | static void io_subchannel_quiesce(struct subchannel *); |
312 | ||
b2ffd8e9 CH |
313 | /** |
314 | * ccw_device_set_offline() - disable a ccw device for I/O | |
315 | * @cdev: target ccw device | |
316 | * | |
317 | * This function calls the driver's set_offline() function for @cdev, if | |
318 | * given, and then disables @cdev. | |
319 | * Returns: | |
320 | * %0 on success and a negative error value on failure. | |
321 | * Context: | |
322 | * enabled, ccw device lock not held | |
323 | */ | |
324 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 | 325 | { |
d40f7b75 SO |
326 | struct subchannel *sch; |
327 | int ret, state; | |
1da177e4 LT |
328 | |
329 | if (!cdev) | |
330 | return -ENODEV; | |
331 | if (!cdev->online || !cdev->drv) | |
332 | return -EINVAL; | |
333 | ||
334 | if (cdev->drv->set_offline) { | |
335 | ret = cdev->drv->set_offline(cdev); | |
336 | if (ret != 0) | |
337 | return ret; | |
338 | } | |
339 | cdev->online = 0; | |
340 | spin_lock_irq(cdev->ccwlock); | |
d40f7b75 | 341 | sch = to_subchannel(cdev->dev.parent); |
217ee6c6 ME |
342 | /* Wait until a final state or DISCONNECTED is reached */ |
343 | while (!dev_fsm_final_state(cdev) && | |
344 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 345 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
346 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
347 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
348 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 349 | } |
d40f7b75 SO |
350 | do { |
351 | ret = ccw_device_offline(cdev); | |
352 | if (!ret) | |
353 | break; | |
354 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " | |
355 | "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, | |
356 | cdev->private->dev_id.devno); | |
357 | if (ret != -EBUSY) | |
358 | goto error; | |
359 | state = cdev->private->state; | |
360 | spin_unlock_irq(cdev->ccwlock); | |
361 | io_subchannel_quiesce(sch); | |
362 | spin_lock_irq(cdev->ccwlock); | |
363 | cdev->private->state = state; | |
364 | } while (ret == -EBUSY); | |
1da177e4 | 365 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
366 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
367 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
a7ae2c02 PO |
368 | /* Inform the user if set offline failed. */ |
369 | if (cdev->private->state == DEV_STATE_BOXED) { | |
370 | pr_warning("%s: The device entered boxed state while " | |
371 | "being set offline\n", dev_name(&cdev->dev)); | |
372 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
373 | pr_warning("%s: The device stopped operating while " | |
374 | "being set offline\n", dev_name(&cdev->dev)); | |
375 | } | |
217ee6c6 ME |
376 | /* Give up reference from ccw_device_set_online(). */ |
377 | put_device(&cdev->dev); | |
378 | return 0; | |
379 | ||
380 | error: | |
217ee6c6 ME |
381 | cdev->private->state = DEV_STATE_OFFLINE; |
382 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
383 | spin_unlock_irq(cdev->ccwlock); | |
384 | /* Give up reference from ccw_device_set_online(). */ | |
385 | put_device(&cdev->dev); | |
386 | return -ENODEV; | |
1da177e4 LT |
387 | } |
388 | ||
b2ffd8e9 CH |
389 | /** |
390 | * ccw_device_set_online() - enable a ccw device for I/O | |
391 | * @cdev: target ccw device | |
392 | * | |
393 | * This function first enables @cdev and then calls the driver's set_online() | |
394 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
395 | * disabled again. | |
396 | * Returns: | |
397 | * %0 on success and a negative error value on failure. | |
398 | * Context: | |
399 | * enabled, ccw device lock not held | |
400 | */ | |
401 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
402 | { |
403 | int ret; | |
217ee6c6 | 404 | int ret2; |
1da177e4 LT |
405 | |
406 | if (!cdev) | |
407 | return -ENODEV; | |
408 | if (cdev->online || !cdev->drv) | |
409 | return -EINVAL; | |
9cd67421 CH |
410 | /* Hold on to an extra reference while device is online. */ |
411 | if (!get_device(&cdev->dev)) | |
412 | return -ENODEV; | |
1da177e4 LT |
413 | |
414 | spin_lock_irq(cdev->ccwlock); | |
415 | ret = ccw_device_online(cdev); | |
416 | spin_unlock_irq(cdev->ccwlock); | |
417 | if (ret == 0) | |
418 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
419 | else { | |
139b83dd | 420 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
421 | "device 0.%x.%04x\n", |
422 | ret, cdev->private->dev_id.ssid, | |
423 | cdev->private->dev_id.devno); | |
9cd67421 CH |
424 | /* Give up online reference since onlining failed. */ |
425 | put_device(&cdev->dev); | |
1da177e4 LT |
426 | return ret; |
427 | } | |
217ee6c6 ME |
428 | spin_lock_irq(cdev->ccwlock); |
429 | /* Check if online processing was successful */ | |
430 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
431 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
432 | spin_unlock_irq(cdev->ccwlock); | |
a7ae2c02 PO |
433 | /* Inform the user that set online failed. */ |
434 | if (cdev->private->state == DEV_STATE_BOXED) { | |
435 | pr_warning("%s: Setting the device online failed " | |
436 | "because it is boxed\n", | |
437 | dev_name(&cdev->dev)); | |
438 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
439 | pr_warning("%s: Setting the device online failed " | |
440 | "because it is not operational\n", | |
441 | dev_name(&cdev->dev)); | |
442 | } | |
9cd67421 CH |
443 | /* Give up online reference since onlining failed. */ |
444 | put_device(&cdev->dev); | |
1da177e4 | 445 | return -ENODEV; |
9cd67421 | 446 | } |
217ee6c6 ME |
447 | spin_unlock_irq(cdev->ccwlock); |
448 | if (cdev->drv->set_online) | |
449 | ret = cdev->drv->set_online(cdev); | |
450 | if (ret) | |
451 | goto rollback; | |
452 | cdev->online = 1; | |
453 | return 0; | |
454 | ||
455 | rollback: | |
1da177e4 | 456 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
457 | /* Wait until a final state or DISCONNECTED is reached */ |
458 | while (!dev_fsm_final_state(cdev) && | |
459 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
460 | spin_unlock_irq(cdev->ccwlock); | |
461 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
462 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
463 | spin_lock_irq(cdev->ccwlock); | |
464 | } | |
465 | ret2 = ccw_device_offline(cdev); | |
466 | if (ret2) | |
467 | goto error; | |
468 | spin_unlock_irq(cdev->ccwlock); | |
469 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
470 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
471 | /* Give up online reference since onlining failed. */ | |
472 | put_device(&cdev->dev); | |
473 | return ret; | |
474 | ||
475 | error: | |
476 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
477 | "device 0.%x.%04x\n", | |
478 | ret2, cdev->private->dev_id.ssid, | |
479 | cdev->private->dev_id.devno); | |
480 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 481 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
482 | /* Give up online reference since onlining failed. */ |
483 | put_device(&cdev->dev); | |
217ee6c6 | 484 | return ret; |
1da177e4 LT |
485 | } |
486 | ||
e74fe0ce | 487 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 488 | { |
37de53bb PO |
489 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
490 | spin_lock_irq(cdev->ccwlock); | |
491 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
492 | spin_unlock_irq(cdev->ccwlock); | |
7cd40314 SO |
493 | return 0; |
494 | } | |
495 | if (cdev->drv && cdev->drv->set_offline) | |
e74fe0ce | 496 | return ccw_device_set_offline(cdev); |
7cd40314 | 497 | return -EINVAL; |
f5ba6c86 CH |
498 | } |
499 | ||
500 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
501 | { | |
f5ba6c86 | 502 | /* Do device recognition, if needed. */ |
99f6a570 | 503 | if (cdev->private->state == DEV_STATE_BOXED) { |
1f5bd384 | 504 | spin_lock_irq(cdev->ccwlock); |
736b5db8 | 505 | ccw_device_recognition(cdev); |
1f5bd384 | 506 | spin_unlock_irq(cdev->ccwlock); |
f5ba6c86 CH |
507 | wait_event(cdev->private->wait_q, |
508 | cdev->private->flags.recog_done); | |
156013ff SO |
509 | if (cdev->private->state != DEV_STATE_OFFLINE) |
510 | /* recognition failed */ | |
511 | return -EAGAIN; | |
f5ba6c86 CH |
512 | } |
513 | if (cdev->drv && cdev->drv->set_online) | |
7cd40314 SO |
514 | return ccw_device_set_online(cdev); |
515 | return -EINVAL; | |
f5ba6c86 | 516 | } |
156013ff | 517 | |
c78aa6cb | 518 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
519 | { |
520 | int ret; | |
521 | ||
522 | ret = online_store_recog_and_online(cdev); | |
156013ff | 523 | if (ret && !force) |
c78aa6cb | 524 | return ret; |
f5ba6c86 CH |
525 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
526 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
527 | if (ret) |
528 | return ret; | |
f5ba6c86 CH |
529 | if (cdev->id.cu_type == 0) |
530 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
531 | ret = online_store_recog_and_online(cdev); |
532 | if (ret) | |
533 | return ret; | |
f5ba6c86 | 534 | } |
c78aa6cb | 535 | return 0; |
f5ba6c86 CH |
536 | } |
537 | ||
538 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
539 | const char *buf, size_t count) | |
1da177e4 LT |
540 | { |
541 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
542 | int force, ret; |
543 | unsigned long i; | |
1da177e4 | 544 | |
a2fc8485 | 545 | /* Prevent conflict between multiple on-/offline processing requests. */ |
350e9120 | 546 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 | 547 | return -EAGAIN; |
a2fc8485 PO |
548 | /* Prevent conflict between internal I/Os and on-/offline processing. */ |
549 | if (!dev_fsm_final_state(cdev) && | |
550 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
551 | ret = -EAGAIN; | |
552 | goto out_onoff; | |
553 | } | |
554 | /* Prevent conflict between pending work and on-/offline processing.*/ | |
555 | if (work_pending(&cdev->private->todo_work)) { | |
556 | ret = -EAGAIN; | |
557 | goto out_onoff; | |
558 | } | |
1da177e4 | 559 | |
3bda058b | 560 | if (cdev->drv && !try_module_get(cdev->drv->driver.owner)) { |
a2fc8485 PO |
561 | ret = -EINVAL; |
562 | goto out_onoff; | |
1da177e4 LT |
563 | } |
564 | if (!strncmp(buf, "force\n", count)) { | |
565 | force = 1; | |
566 | i = 1; | |
2f972202 | 567 | ret = 0; |
1da177e4 LT |
568 | } else { |
569 | force = 0; | |
2f972202 | 570 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 571 | } |
2f972202 CH |
572 | if (ret) |
573 | goto out; | |
f5ba6c86 CH |
574 | switch (i) { |
575 | case 0: | |
e74fe0ce | 576 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
577 | break; |
578 | case 1: | |
c78aa6cb | 579 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
580 | break; |
581 | default: | |
2f972202 | 582 | ret = -EINVAL; |
1da177e4 | 583 | } |
2f972202 | 584 | out: |
1da177e4 | 585 | if (cdev->drv) |
3bda058b | 586 | module_put(cdev->drv->driver.owner); |
a2fc8485 | 587 | out_onoff: |
1da177e4 | 588 | atomic_set(&cdev->private->onoff, 0); |
e74fe0ce | 589 | return (ret < 0) ? ret : count; |
1da177e4 LT |
590 | } |
591 | ||
592 | static ssize_t | |
3fd3c0a5 | 593 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
594 | { |
595 | struct ccw_device *cdev = to_ccwdev(dev); | |
596 | struct subchannel *sch; | |
597 | ||
d7b5a4c9 CH |
598 | if (ccw_device_is_orphan(cdev)) |
599 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
600 | switch (cdev->private->state) { |
601 | case DEV_STATE_BOXED: | |
602 | return sprintf(buf, "boxed\n"); | |
603 | case DEV_STATE_DISCONNECTED: | |
604 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
605 | case DEV_STATE_NOT_OPER: | |
606 | sch = to_subchannel(dev->parent); | |
607 | if (!sch->lpm) | |
608 | return sprintf(buf, "no path\n"); | |
609 | else | |
610 | return sprintf(buf, "no device\n"); | |
611 | default: | |
612 | /* All other states considered fine. */ | |
613 | return sprintf(buf, "good\n"); | |
614 | } | |
615 | } | |
616 | ||
fd0457a6 ME |
617 | static ssize_t |
618 | initiate_logging(struct device *dev, struct device_attribute *attr, | |
619 | const char *buf, size_t count) | |
620 | { | |
621 | struct subchannel *sch = to_subchannel(dev); | |
622 | int rc; | |
623 | ||
624 | rc = chsc_siosl(sch->schid); | |
625 | if (rc < 0) { | |
626 | pr_warning("Logging for subchannel 0.%x.%04x failed with " | |
627 | "errno=%d\n", | |
628 | sch->schid.ssid, sch->schid.sch_no, rc); | |
629 | return rc; | |
630 | } | |
631 | pr_notice("Logging for subchannel 0.%x.%04x was triggered\n", | |
632 | sch->schid.ssid, sch->schid.sch_no); | |
633 | return count; | |
634 | } | |
635 | ||
1da177e4 LT |
636 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); |
637 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
638 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
639 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 640 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 641 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 | 642 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
fd0457a6 | 643 | static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); |
1da177e4 | 644 | |
7e9db9ea | 645 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
646 | &dev_attr_chpids.attr, |
647 | &dev_attr_pimpampom.attr, | |
fd0457a6 | 648 | &dev_attr_logging.attr, |
1da177e4 LT |
649 | NULL, |
650 | }; | |
651 | ||
7e9db9ea CH |
652 | static struct attribute_group io_subchannel_attr_group = { |
653 | .attrs = io_subchannel_attrs, | |
529192f3 | 654 | }; |
1da177e4 LT |
655 | |
656 | static struct attribute * ccwdev_attrs[] = { | |
657 | &dev_attr_devtype.attr, | |
658 | &dev_attr_cutype.attr, | |
f1fc78a8 | 659 | &dev_attr_modalias.attr, |
1da177e4 LT |
660 | &dev_attr_online.attr, |
661 | &dev_attr_cmb_enable.attr, | |
662 | &dev_attr_availability.attr, | |
663 | NULL, | |
664 | }; | |
665 | ||
666 | static struct attribute_group ccwdev_attr_group = { | |
667 | .attrs = ccwdev_attrs, | |
668 | }; | |
669 | ||
a4dbd674 | 670 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
671 | &ccwdev_attr_group, |
672 | NULL, | |
673 | }; | |
1da177e4 LT |
674 | |
675 | /* this is a simple abstraction for device_register that sets the | |
676 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 677 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
678 | { |
679 | struct device *dev = &cdev->dev; | |
680 | int ret; | |
681 | ||
682 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
683 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
684 | cdev->private->dev_id.devno); | |
685 | if (ret) | |
686 | return ret; | |
7d253b9a | 687 | return device_add(dev); |
1da177e4 LT |
688 | } |
689 | ||
5d6e6b6f | 690 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 691 | { |
5d6e6b6f PO |
692 | struct ccw_device *cdev = to_ccwdev(dev); |
693 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 694 | |
d7b5a4c9 CH |
695 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
696 | } | |
697 | ||
5d6e6b6f | 698 | static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) |
d7b5a4c9 CH |
699 | { |
700 | struct device *dev; | |
701 | ||
5d6e6b6f | 702 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
703 | |
704 | return dev ? to_ccwdev(dev) : NULL; | |
705 | } | |
706 | ||
37de53bb | 707 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 708 | { |
eb32ae8d | 709 | int ret; |
1da177e4 | 710 | |
7d253b9a | 711 | if (device_is_registered(&cdev->dev)) { |
eb32ae8d CH |
712 | device_release_driver(&cdev->dev); |
713 | ret = device_attach(&cdev->dev); | |
714 | WARN_ON(ret == -ENODEV); | |
715 | } | |
1da177e4 LT |
716 | } |
717 | ||
718 | static void | |
719 | ccw_device_release(struct device *dev) | |
720 | { | |
721 | struct ccw_device *cdev; | |
722 | ||
723 | cdev = to_ccwdev(dev); | |
6eff208f CH |
724 | /* Release reference of parent subchannel. */ |
725 | put_device(cdev->dev.parent); | |
1da177e4 LT |
726 | kfree(cdev->private); |
727 | kfree(cdev); | |
728 | } | |
729 | ||
7674da77 CH |
730 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
731 | { | |
732 | struct ccw_device *cdev; | |
733 | ||
734 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
735 | if (cdev) { | |
736 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
737 | GFP_KERNEL | GFP_DMA); | |
738 | if (cdev->private) | |
739 | return cdev; | |
740 | } | |
741 | kfree(cdev); | |
742 | return ERR_PTR(-ENOMEM); | |
743 | } | |
744 | ||
37de53bb PO |
745 | static void ccw_device_todo(struct work_struct *work); |
746 | ||
7674da77 CH |
747 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
748 | struct ccw_device *cdev) | |
749 | { | |
750 | cdev->private->cdev = cdev; | |
de400d6b | 751 | cdev->private->int_class = IOINT_CIO; |
7674da77 CH |
752 | atomic_set(&cdev->private->onoff, 0); |
753 | cdev->dev.parent = &sch->dev; | |
754 | cdev->dev.release = ccw_device_release; | |
37de53bb | 755 | INIT_WORK(&cdev->private->todo_work, ccw_device_todo); |
ef99516c | 756 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
757 | /* Do first half of device_register. */ |
758 | device_initialize(&cdev->dev); | |
759 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
760 | /* Release reference from device_initialize(). */ |
761 | put_device(&cdev->dev); | |
7674da77 CH |
762 | return -ENODEV; |
763 | } | |
24a1872d | 764 | cdev->private->flags.initialized = 1; |
7674da77 CH |
765 | return 0; |
766 | } | |
767 | ||
768 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
769 | { | |
770 | struct ccw_device *cdev; | |
771 | int ret; | |
772 | ||
773 | cdev = io_subchannel_allocate_dev(sch); | |
774 | if (!IS_ERR(cdev)) { | |
775 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 776 | if (ret) |
7674da77 | 777 | cdev = ERR_PTR(ret); |
7674da77 CH |
778 | } |
779 | return cdev; | |
780 | } | |
781 | ||
736b5db8 | 782 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 783 | |
d7b5a4c9 CH |
784 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
785 | { | |
786 | struct ccw_device *cdev; | |
787 | ||
788 | /* Need to allocate a new ccw device. */ | |
789 | cdev = io_subchannel_create_ccwdev(sch); | |
790 | if (IS_ERR(cdev)) { | |
791 | /* OK, we did everything we could... */ | |
792 | css_sch_device_unregister(sch); | |
793 | return; | |
794 | } | |
d7b5a4c9 | 795 | /* Start recognition for the new ccw device. */ |
736b5db8 | 796 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
797 | } |
798 | ||
1da177e4 LT |
799 | /* |
800 | * Register recognized device. | |
801 | */ | |
37de53bb | 802 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 803 | { |
1da177e4 | 804 | struct subchannel *sch; |
a290156f | 805 | int ret, adjust_init_count = 1; |
1da177e4 LT |
806 | unsigned long flags; |
807 | ||
1da177e4 | 808 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
809 | /* |
810 | * Check if subchannel is still registered. It may have become | |
811 | * unregistered if a machine check hit us after finishing | |
812 | * device recognition but before the register work could be | |
813 | * queued. | |
814 | */ | |
815 | if (!device_is_registered(&sch->dev)) | |
816 | goto out_err; | |
82b7ac05 | 817 | css_update_ssd_info(sch); |
47af5518 CH |
818 | /* |
819 | * io_subchannel_register() will also be called after device | |
820 | * recognition has been done for a boxed device (which will already | |
821 | * be registered). We need to reprobe since we may now have sense id | |
822 | * information. | |
823 | */ | |
d6a30761 | 824 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
825 | if (!cdev->drv) { |
826 | ret = device_reprobe(&cdev->dev); | |
827 | if (ret) | |
828 | /* We can't do much here. */ | |
139b83dd | 829 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
830 | " %d for 0.%x.%04x\n", ret, |
831 | cdev->private->dev_id.ssid, | |
832 | cdev->private->dev_id.devno); | |
47af5518 | 833 | } |
a290156f | 834 | adjust_init_count = 0; |
1da177e4 LT |
835 | goto out; |
836 | } | |
fa1a8c23 CH |
837 | /* |
838 | * Now we know this subchannel will stay, we can throw | |
839 | * our delayed uevent. | |
840 | */ | |
f67f129e | 841 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 842 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
843 | /* make it known to the system */ |
844 | ret = ccw_device_register(cdev); | |
845 | if (ret) { | |
e556bbbd CH |
846 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
847 | cdev->private->dev_id.ssid, | |
848 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 849 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 850 | sch_set_cdev(sch, NULL); |
2ec22984 | 851 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
852 | /* Release initial device reference. */ |
853 | put_device(&cdev->dev); | |
5fb6b854 | 854 | goto out_err; |
1da177e4 | 855 | } |
1da177e4 LT |
856 | out: |
857 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 858 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 859 | out_err: |
a290156f | 860 | if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count)) |
1da177e4 LT |
861 | wake_up(&ccw_device_init_wq); |
862 | } | |
863 | ||
37de53bb | 864 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 865 | { |
1da177e4 LT |
866 | struct subchannel *sch; |
867 | ||
46fbe4e4 PO |
868 | /* Get subchannel reference for local processing. */ |
869 | if (!get_device(cdev->dev.parent)) | |
870 | return; | |
1da177e4 | 871 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 872 | css_sch_device_unregister(sch); |
46fbe4e4 | 873 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
874 | put_device(&sch->dev); |
875 | } | |
876 | ||
877 | /* | |
878 | * subchannel recognition done. Called from the state machine. | |
879 | */ | |
880 | void | |
881 | io_subchannel_recog_done(struct ccw_device *cdev) | |
882 | { | |
1da177e4 LT |
883 | if (css_init_done == 0) { |
884 | cdev->private->flags.recog_done = 1; | |
885 | return; | |
886 | } | |
887 | switch (cdev->private->state) { | |
47593bfa SO |
888 | case DEV_STATE_BOXED: |
889 | /* Device did not respond in time. */ | |
1da177e4 LT |
890 | case DEV_STATE_NOT_OPER: |
891 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
892 | /* Remove device found not operational. */ |
893 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
894 | if (atomic_dec_and_test(&ccw_device_init_count)) |
895 | wake_up(&ccw_device_init_wq); | |
896 | break; | |
1da177e4 LT |
897 | case DEV_STATE_OFFLINE: |
898 | /* | |
899 | * We can't register the device in interrupt context so | |
900 | * we schedule a work item. | |
901 | */ | |
37de53bb | 902 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
903 | break; |
904 | } | |
905 | } | |
906 | ||
736b5db8 | 907 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 908 | { |
1da177e4 LT |
909 | struct ccw_device_private *priv; |
910 | ||
2ec22984 | 911 | cdev->ccwlock = sch->lock; |
fb6958a5 | 912 | |
1da177e4 LT |
913 | /* Init private data. */ |
914 | priv = cdev->private; | |
78964268 CH |
915 | priv->dev_id.devno = sch->schib.pmcw.dev; |
916 | priv->dev_id.ssid = sch->schid.ssid; | |
917 | priv->schid = sch->schid; | |
1da177e4 LT |
918 | priv->state = DEV_STATE_NOT_OPER; |
919 | INIT_LIST_HEAD(&priv->cmb_list); | |
920 | init_waitqueue_head(&priv->wait_q); | |
921 | init_timer(&priv->timer); | |
922 | ||
1da177e4 LT |
923 | /* Increase counter of devices currently in recognition. */ |
924 | atomic_inc(&ccw_device_init_count); | |
925 | ||
926 | /* Start async. device sensing. */ | |
2ec22984 | 927 | spin_lock_irq(sch->lock); |
60e4dac1 | 928 | sch_set_cdev(sch, cdev); |
736b5db8 | 929 | ccw_device_recognition(cdev); |
2ec22984 | 930 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
931 | } |
932 | ||
5d6e6b6f PO |
933 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
934 | struct subchannel *sch) | |
d7b5a4c9 | 935 | { |
5d6e6b6f | 936 | struct subchannel *old_sch; |
0c609fca | 937 | int rc, old_enabled = 0; |
d7b5a4c9 | 938 | |
5d6e6b6f PO |
939 | old_sch = to_subchannel(cdev->dev.parent); |
940 | /* Obtain child reference for new parent. */ | |
6eff208f | 941 | if (!get_device(&sch->dev)) |
5d6e6b6f | 942 | return -ENODEV; |
0c609fca SO |
943 | |
944 | if (!sch_is_pseudo_sch(old_sch)) { | |
945 | spin_lock_irq(old_sch->lock); | |
946 | old_enabled = old_sch->schib.pmcw.ena; | |
947 | rc = 0; | |
948 | if (old_enabled) | |
949 | rc = cio_disable_subchannel(old_sch); | |
950 | spin_unlock_irq(old_sch->lock); | |
951 | if (rc == -EBUSY) { | |
952 | /* Release child reference for new parent. */ | |
953 | put_device(&sch->dev); | |
954 | return rc; | |
955 | } | |
956 | } | |
957 | ||
d7b5a4c9 | 958 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 959 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
960 | mutex_unlock(&sch->reg_mutex); |
961 | if (rc) { | |
5d6e6b6f | 962 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
963 | cdev->private->dev_id.ssid, |
964 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f | 965 | sch->schib.pmcw.dev, rc); |
0c609fca SO |
966 | if (old_enabled) { |
967 | /* Try to reenable the old subchannel. */ | |
968 | spin_lock_irq(old_sch->lock); | |
969 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
970 | spin_unlock_irq(old_sch->lock); | |
971 | } | |
5d6e6b6f | 972 | /* Release child reference for new parent. */ |
6eff208f | 973 | put_device(&sch->dev); |
5d6e6b6f | 974 | return rc; |
d7b5a4c9 | 975 | } |
5d6e6b6f PO |
976 | /* Clean up old subchannel. */ |
977 | if (!sch_is_pseudo_sch(old_sch)) { | |
978 | spin_lock_irq(old_sch->lock); | |
979 | sch_set_cdev(old_sch, NULL); | |
5d6e6b6f PO |
980 | spin_unlock_irq(old_sch->lock); |
981 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 982 | } |
5d6e6b6f PO |
983 | /* Release child reference for old parent. */ |
984 | put_device(&old_sch->dev); | |
985 | /* Initialize new subchannel. */ | |
986 | spin_lock_irq(sch->lock); | |
987 | cdev->private->schid = sch->schid; | |
988 | cdev->ccwlock = sch->lock; | |
989 | if (!sch_is_pseudo_sch(sch)) | |
990 | sch_set_cdev(sch, cdev); | |
991 | spin_unlock_irq(sch->lock); | |
992 | if (!sch_is_pseudo_sch(sch)) | |
993 | css_update_ssd_info(sch); | |
994 | return 0; | |
995 | } | |
996 | ||
997 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
998 | { | |
999 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1000 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
1001 | ||
1002 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
1003 | } |
1004 | ||
602b20f2 CH |
1005 | static void io_subchannel_irq(struct subchannel *sch) |
1006 | { | |
1007 | struct ccw_device *cdev; | |
1008 | ||
db6a6423 | 1009 | cdev = sch_get_cdev(sch); |
602b20f2 | 1010 | |
efd986db SO |
1011 | CIO_TRACE_EVENT(6, "IRQ"); |
1012 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
1013 | if (cdev) |
1014 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
de400d6b PO |
1015 | else |
1016 | kstat_cpu(smp_processor_id()).irqs[IOINT_CIO]++; | |
602b20f2 CH |
1017 | } |
1018 | ||
13952ec1 SO |
1019 | void io_subchannel_init_config(struct subchannel *sch) |
1020 | { | |
1021 | memset(&sch->config, 0, sizeof(sch->config)); | |
1022 | sch->config.csense = 1; | |
13952ec1 SO |
1023 | } |
1024 | ||
0ae7a7b2 CH |
1025 | static void io_subchannel_init_fields(struct subchannel *sch) |
1026 | { | |
1027 | if (cio_is_console(sch->schid)) | |
1028 | sch->opm = 0xff; | |
1029 | else | |
1030 | sch->opm = chp_get_sch_opm(sch); | |
1031 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1032 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1033 | |
1034 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1035 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1036 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1037 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1038 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1039 | |
1040 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1041 | } |
1042 | ||
90ed2b69 CH |
1043 | /* |
1044 | * Note: We always return 0 so that we bind to the device even on error. | |
1045 | * This is needed so that our remove function is called on unregister. | |
1046 | */ | |
0ae7a7b2 | 1047 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1048 | { |
f92519e8 | 1049 | struct io_subchannel_private *io_priv; |
1da177e4 LT |
1050 | struct ccw_device *cdev; |
1051 | int rc; | |
1da177e4 | 1052 | |
6d7c5afc | 1053 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1054 | rc = sysfs_create_group(&sch->dev.kobj, |
1055 | &io_subchannel_attr_group); | |
1056 | if (rc) | |
1057 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1058 | "attributes for subchannel " | |
1059 | "0.%x.%04x (rc=%d)\n", | |
1060 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1061 | /* |
6d7c5afc | 1062 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1063 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1064 | * the ccw_device and exit. |
1da177e4 | 1065 | */ |
f67f129e | 1066 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1067 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1068 | cdev = sch_get_cdev(sch); |
e1031786 | 1069 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 | 1070 | device_initialize(&cdev->dev); |
24a1872d | 1071 | cdev->private->flags.initialized = 1; |
1da177e4 | 1072 | ccw_device_register(cdev); |
1da177e4 LT |
1073 | /* |
1074 | * Check if the device is already online. If it is | |
9cd67421 CH |
1075 | * the reference count needs to be corrected since we |
1076 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1077 | */ |
1078 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1079 | cdev->private->state != DEV_STATE_OFFLINE && | |
1080 | cdev->private->state != DEV_STATE_BOXED) | |
1081 | get_device(&cdev->dev); | |
1082 | return 0; | |
1083 | } | |
0ae7a7b2 | 1084 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1085 | rc = cio_commit_config(sch); |
1086 | if (rc) | |
1087 | goto out_schedule; | |
7e9db9ea CH |
1088 | rc = sysfs_create_group(&sch->dev.kobj, |
1089 | &io_subchannel_attr_group); | |
1090 | if (rc) | |
90ed2b69 | 1091 | goto out_schedule; |
cd6b4f27 | 1092 | /* Allocate I/O subchannel private data. */ |
f92519e8 SO |
1093 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); |
1094 | if (!io_priv) | |
48e4c385 | 1095 | goto out_schedule; |
f92519e8 SO |
1096 | |
1097 | set_io_private(sch, io_priv); | |
5d6e6b6f | 1098 | css_schedule_eval(sch->schid); |
7e9db9ea | 1099 | return 0; |
48e4c385 | 1100 | |
90ed2b69 | 1101 | out_schedule: |
390935ac PO |
1102 | spin_lock_irq(sch->lock); |
1103 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1104 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1105 | return 0; |
1da177e4 LT |
1106 | } |
1107 | ||
1da177e4 | 1108 | static int |
8bbace7e | 1109 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 | 1110 | { |
f92519e8 | 1111 | struct io_subchannel_private *io_priv = to_io_private(sch); |
1da177e4 | 1112 | struct ccw_device *cdev; |
1da177e4 | 1113 | |
db6a6423 CH |
1114 | cdev = sch_get_cdev(sch); |
1115 | if (!cdev) | |
48e4c385 | 1116 | goto out_free; |
6e9a0f67 | 1117 | io_subchannel_quiesce(sch); |
1da177e4 | 1118 | /* Set ccw device to not operational and drop reference. */ |
7a8ad100 | 1119 | spin_lock_irq(cdev->ccwlock); |
db6a6423 | 1120 | sch_set_cdev(sch, NULL); |
f92519e8 | 1121 | set_io_private(sch, NULL); |
1da177e4 | 1122 | cdev->private->state = DEV_STATE_NOT_OPER; |
7a8ad100 | 1123 | spin_unlock_irq(cdev->ccwlock); |
ef99516c | 1124 | ccw_device_unregister(cdev); |
48e4c385 | 1125 | out_free: |
f92519e8 | 1126 | kfree(io_priv); |
7e9db9ea | 1127 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1128 | return 0; |
1129 | } | |
1130 | ||
602b20f2 | 1131 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1132 | { |
1133 | struct ccw_device *cdev; | |
1134 | ||
db6a6423 | 1135 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1136 | if (cdev) |
1137 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1138 | } | |
1139 | ||
c820de39 CH |
1140 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1141 | { | |
1142 | struct ccw_device *cdev; | |
1143 | ||
1144 | cdev = sch_get_cdev(sch); | |
1145 | if (!cdev) | |
1146 | return; | |
4257aaec PO |
1147 | if (cio_update_schib(sch)) |
1148 | goto err; | |
1149 | /* Check for I/O on path. */ | |
1150 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1151 | goto out; | |
1152 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1153 | ccw_device_kill_io(cdev); | |
1154 | goto out; | |
1155 | } | |
1156 | if (cio_clear(sch)) | |
1157 | goto err; | |
1158 | out: | |
1159 | /* Trigger path verification. */ | |
1160 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1161 | return; | |
c820de39 | 1162 | |
4257aaec PO |
1163 | err: |
1164 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1165 | } |
1166 | ||
99611f87 CH |
1167 | static int io_subchannel_chp_event(struct subchannel *sch, |
1168 | struct chp_link *link, int event) | |
c820de39 | 1169 | { |
585b954e | 1170 | struct ccw_device *cdev = sch_get_cdev(sch); |
c820de39 | 1171 | int mask; |
c820de39 | 1172 | |
99611f87 | 1173 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1174 | if (!mask) |
1175 | return 0; | |
1176 | switch (event) { | |
1177 | case CHP_VARY_OFF: | |
1178 | sch->opm &= ~mask; | |
1179 | sch->lpm &= ~mask; | |
585b954e SO |
1180 | if (cdev) |
1181 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1182 | io_subchannel_terminate_path(sch, mask); |
1183 | break; | |
1184 | case CHP_VARY_ON: | |
1185 | sch->opm |= mask; | |
1186 | sch->lpm |= mask; | |
585b954e SO |
1187 | if (cdev) |
1188 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1189 | io_subchannel_verify(sch); |
1190 | break; | |
1191 | case CHP_OFFLINE: | |
cdb912a4 | 1192 | if (cio_update_schib(sch)) |
c820de39 | 1193 | return -ENODEV; |
585b954e SO |
1194 | if (cdev) |
1195 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1196 | io_subchannel_terminate_path(sch, mask); |
1197 | break; | |
1198 | case CHP_ONLINE: | |
cdb912a4 SO |
1199 | if (cio_update_schib(sch)) |
1200 | return -ENODEV; | |
c820de39 | 1201 | sch->lpm |= mask & sch->opm; |
585b954e SO |
1202 | if (cdev) |
1203 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1204 | io_subchannel_verify(sch); |
1205 | break; | |
1206 | } | |
1207 | return 0; | |
1208 | } | |
1209 | ||
6e9a0f67 | 1210 | static void io_subchannel_quiesce(struct subchannel *sch) |
1da177e4 | 1211 | { |
1da177e4 LT |
1212 | struct ccw_device *cdev; |
1213 | int ret; | |
1214 | ||
56e6b796 | 1215 | spin_lock_irq(sch->lock); |
db6a6423 | 1216 | cdev = sch_get_cdev(sch); |
a8237fc4 | 1217 | if (cio_is_console(sch->schid)) |
56e6b796 | 1218 | goto out_unlock; |
1da177e4 | 1219 | if (!sch->schib.pmcw.ena) |
56e6b796 | 1220 | goto out_unlock; |
1da177e4 LT |
1221 | ret = cio_disable_subchannel(sch); |
1222 | if (ret != -EBUSY) | |
56e6b796 | 1223 | goto out_unlock; |
1da177e4 | 1224 | if (cdev->handler) |
56e6b796 SO |
1225 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); |
1226 | while (ret == -EBUSY) { | |
1227 | cdev->private->state = DEV_STATE_QUIESCE; | |
376ae475 | 1228 | cdev->private->iretry = 255; |
56e6b796 SO |
1229 | ret = ccw_device_cancel_halt_clear(cdev); |
1230 | if (ret == -EBUSY) { | |
1231 | ccw_device_set_timeout(cdev, HZ/10); | |
1232 | spin_unlock_irq(sch->lock); | |
1233 | wait_event(cdev->private->wait_q, | |
1234 | cdev->private->state != DEV_STATE_QUIESCE); | |
1235 | spin_lock_irq(sch->lock); | |
1236 | } | |
1237 | ret = cio_disable_subchannel(sch); | |
1da177e4 | 1238 | } |
56e6b796 SO |
1239 | out_unlock: |
1240 | spin_unlock_irq(sch->lock); | |
1da177e4 LT |
1241 | } |
1242 | ||
6e9a0f67 SO |
1243 | static void io_subchannel_shutdown(struct subchannel *sch) |
1244 | { | |
1245 | io_subchannel_quiesce(sch); | |
1246 | } | |
1247 | ||
c820de39 CH |
1248 | static int device_is_disconnected(struct ccw_device *cdev) |
1249 | { | |
1250 | if (!cdev) | |
1251 | return 0; | |
1252 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1253 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1254 | } | |
1255 | ||
1256 | static int recovery_check(struct device *dev, void *data) | |
1257 | { | |
1258 | struct ccw_device *cdev = to_ccwdev(dev); | |
1259 | int *redo = data; | |
1260 | ||
1261 | spin_lock_irq(cdev->ccwlock); | |
1262 | switch (cdev->private->state) { | |
1263 | case DEV_STATE_DISCONNECTED: | |
1264 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1265 | cdev->private->dev_id.ssid, | |
1266 | cdev->private->dev_id.devno); | |
1267 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1268 | *redo = 1; | |
1269 | break; | |
1270 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1271 | *redo = 1; | |
1272 | break; | |
1273 | } | |
1274 | spin_unlock_irq(cdev->ccwlock); | |
1275 | ||
1276 | return 0; | |
1277 | } | |
1278 | ||
1279 | static void recovery_work_func(struct work_struct *unused) | |
1280 | { | |
1281 | int redo = 0; | |
1282 | ||
1283 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1284 | if (redo) { | |
1285 | spin_lock_irq(&recovery_lock); | |
1286 | if (!timer_pending(&recovery_timer)) { | |
1287 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1288 | recovery_phase++; | |
1289 | mod_timer(&recovery_timer, jiffies + | |
1290 | recovery_delay[recovery_phase] * HZ); | |
1291 | } | |
1292 | spin_unlock_irq(&recovery_lock); | |
1293 | } else | |
1294 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1295 | } | |
1296 | ||
1297 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1298 | ||
1299 | static void recovery_func(unsigned long data) | |
1300 | { | |
1301 | /* | |
1302 | * We can't do our recovery in softirq context and it's not | |
1303 | * performance critical, so we schedule it. | |
1304 | */ | |
1305 | schedule_work(&recovery_work); | |
1306 | } | |
1307 | ||
1308 | static void ccw_device_schedule_recovery(void) | |
1309 | { | |
1310 | unsigned long flags; | |
1311 | ||
1312 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1313 | spin_lock_irqsave(&recovery_lock, flags); | |
1314 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1315 | recovery_phase = 0; | |
1316 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1317 | } | |
1318 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1319 | } | |
1320 | ||
ecf5d9ef PO |
1321 | static int purge_fn(struct device *dev, void *data) |
1322 | { | |
1323 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1324 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1325 | |
1326 | spin_lock_irq(cdev->ccwlock); | |
37de53bb | 1327 | if (is_blacklisted(id->ssid, id->devno) && |
a2fc8485 PO |
1328 | (cdev->private->state == DEV_STATE_OFFLINE) && |
1329 | (atomic_cmpxchg(&cdev->private->onoff, 0, 1) == 0)) { | |
37de53bb PO |
1330 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, |
1331 | id->devno); | |
1332 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
a2fc8485 | 1333 | atomic_set(&cdev->private->onoff, 0); |
37de53bb | 1334 | } |
ecf5d9ef | 1335 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1336 | /* Abort loop in case of pending signal. */ |
1337 | if (signal_pending(current)) | |
1338 | return -EINTR; | |
1339 | ||
1340 | return 0; | |
1341 | } | |
1342 | ||
1343 | /** | |
1344 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1345 | * | |
1346 | * Unregister all ccw devices that are offline and on the blacklist. | |
1347 | */ | |
1348 | int ccw_purge_blacklisted(void) | |
1349 | { | |
1350 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1351 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1352 | return 0; | |
1353 | } | |
1354 | ||
6afcc775 | 1355 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1356 | { |
1357 | if (!cdev) | |
1358 | return; | |
1359 | ccw_device_set_timeout(cdev, 0); | |
1360 | cdev->private->flags.fake_irb = 0; | |
1361 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1362 | if (cdev->online) | |
1363 | ccw_device_schedule_recovery(); | |
1364 | } | |
1365 | ||
91c36919 PO |
1366 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1367 | { | |
1368 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1369 | ||
1370 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1371 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1372 | ccw_device_set_timeout(cdev, 0); |
1373 | cio_disable_subchannel(sch); | |
1374 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1375 | } | |
1376 | ||
5d6e6b6f PO |
1377 | enum io_sch_action { |
1378 | IO_SCH_UNREG, | |
1379 | IO_SCH_ORPH_UNREG, | |
1380 | IO_SCH_ATTACH, | |
1381 | IO_SCH_UNREG_ATTACH, | |
1382 | IO_SCH_ORPH_ATTACH, | |
1383 | IO_SCH_REPROBE, | |
1384 | IO_SCH_VERIFY, | |
1385 | IO_SCH_DISC, | |
1386 | IO_SCH_NOP, | |
1387 | }; | |
1388 | ||
1389 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1390 | { | |
1391 | struct ccw_device *cdev; | |
1392 | ||
1393 | cdev = sch_get_cdev(sch); | |
1394 | if (cio_update_schib(sch)) { | |
1395 | /* Not operational. */ | |
1396 | if (!cdev) | |
1397 | return IO_SCH_UNREG; | |
76e6fb4b | 1398 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1399 | return IO_SCH_UNREG; |
1400 | return IO_SCH_ORPH_UNREG; | |
1401 | } | |
1402 | /* Operational. */ | |
1403 | if (!cdev) | |
1404 | return IO_SCH_ATTACH; | |
1405 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
76e6fb4b | 1406 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1407 | return IO_SCH_UNREG_ATTACH; |
1408 | return IO_SCH_ORPH_ATTACH; | |
1409 | } | |
1410 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
76e6fb4b | 1411 | if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) |
5d6e6b6f PO |
1412 | return IO_SCH_UNREG; |
1413 | return IO_SCH_DISC; | |
1414 | } | |
1415 | if (device_is_disconnected(cdev)) | |
1416 | return IO_SCH_REPROBE; | |
1417 | if (cdev->online) | |
1418 | return IO_SCH_VERIFY; | |
1419 | return IO_SCH_NOP; | |
1420 | } | |
1421 | ||
1422 | /** | |
1423 | * io_subchannel_sch_event - process subchannel event | |
1424 | * @sch: subchannel | |
1425 | * @process: non-zero if function is called in process context | |
1426 | * | |
1427 | * An unspecified event occurred for this subchannel. Adjust data according | |
1428 | * to the current operational state of the subchannel and device. Return | |
1429 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1430 | * function should be called again in process context. | |
1431 | */ | |
1432 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1433 | { |
c820de39 | 1434 | unsigned long flags; |
c820de39 | 1435 | struct ccw_device *cdev; |
5d6e6b6f PO |
1436 | struct ccw_dev_id dev_id; |
1437 | enum io_sch_action action; | |
1438 | int rc = -EAGAIN; | |
c820de39 CH |
1439 | |
1440 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1441 | if (!device_is_registered(&sch->dev)) |
1442 | goto out_unlock; | |
390935ac PO |
1443 | if (work_pending(&sch->todo_work)) |
1444 | goto out_unlock; | |
37de53bb PO |
1445 | cdev = sch_get_cdev(sch); |
1446 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1447 | goto out_unlock; | |
5d6e6b6f PO |
1448 | action = sch_get_action(sch); |
1449 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1450 | sch->schid.ssid, sch->schid.sch_no, process, | |
1451 | action); | |
1452 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1453 | switch (action) { |
1454 | case IO_SCH_REPROBE: | |
1455 | /* Trigger device recognition. */ | |
1456 | ccw_device_trigger_reprobe(cdev); | |
1457 | rc = 0; | |
1458 | goto out_unlock; | |
1459 | case IO_SCH_VERIFY: | |
0d01bb89 SO |
1460 | if (cdev->private->flags.resuming == 1) { |
1461 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch)) { | |
1462 | ccw_device_set_notoper(cdev); | |
1463 | break; | |
1464 | } | |
1465 | } | |
5d6e6b6f PO |
1466 | /* Trigger path verification. */ |
1467 | io_subchannel_verify(sch); | |
1468 | rc = 0; | |
1469 | goto out_unlock; | |
1470 | case IO_SCH_DISC: | |
1471 | ccw_device_set_disconnected(cdev); | |
1472 | rc = 0; | |
1473 | goto out_unlock; | |
1474 | case IO_SCH_ORPH_UNREG: | |
1475 | case IO_SCH_ORPH_ATTACH: | |
1476 | ccw_device_set_disconnected(cdev); | |
1477 | break; | |
1478 | case IO_SCH_UNREG_ATTACH: | |
1479 | case IO_SCH_UNREG: | |
16d2ce27 SO |
1480 | if (!cdev) |
1481 | break; | |
1482 | if (cdev->private->state == DEV_STATE_SENSE_ID) { | |
1483 | /* | |
1484 | * Note: delayed work triggered by this event | |
1485 | * and repeated calls to sch_event are synchronized | |
1486 | * by the above check for work_pending(cdev). | |
1487 | */ | |
1488 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1489 | } else | |
5d6e6b6f PO |
1490 | ccw_device_set_notoper(cdev); |
1491 | break; | |
1492 | case IO_SCH_NOP: | |
1493 | rc = 0; | |
1494 | goto out_unlock; | |
1495 | default: | |
1496 | break; | |
c820de39 | 1497 | } |
5d6e6b6f PO |
1498 | spin_unlock_irqrestore(sch->lock, flags); |
1499 | /* All other actions require process context. */ | |
1500 | if (!process) | |
1501 | goto out; | |
1502 | /* Handle attached ccw device. */ | |
1503 | switch (action) { | |
1504 | case IO_SCH_ORPH_UNREG: | |
1505 | case IO_SCH_ORPH_ATTACH: | |
1506 | /* Move ccw device to orphanage. */ | |
1507 | rc = ccw_device_move_to_orph(cdev); | |
1508 | if (rc) | |
1509 | goto out; | |
c820de39 | 1510 | break; |
5d6e6b6f | 1511 | case IO_SCH_UNREG_ATTACH: |
74b6127e SO |
1512 | if (cdev->private->flags.resuming) { |
1513 | /* Device will be handled later. */ | |
1514 | rc = 0; | |
1515 | goto out; | |
1516 | } | |
5d6e6b6f | 1517 | /* Unregister ccw device. */ |
74b6127e | 1518 | ccw_device_unregister(cdev); |
c820de39 | 1519 | break; |
5d6e6b6f | 1520 | default: |
c820de39 CH |
1521 | break; |
1522 | } | |
5d6e6b6f | 1523 | /* Handle subchannel. */ |
c820de39 | 1524 | switch (action) { |
5d6e6b6f PO |
1525 | case IO_SCH_ORPH_UNREG: |
1526 | case IO_SCH_UNREG: | |
0d01bb89 SO |
1527 | if (!cdev || !cdev->private->flags.resuming) |
1528 | css_sch_device_unregister(sch); | |
c820de39 | 1529 | break; |
5d6e6b6f PO |
1530 | case IO_SCH_ORPH_ATTACH: |
1531 | case IO_SCH_UNREG_ATTACH: | |
1532 | case IO_SCH_ATTACH: | |
1533 | dev_id.ssid = sch->schid.ssid; | |
1534 | dev_id.devno = sch->schib.pmcw.dev; | |
1535 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1536 | if (!cdev) { | |
1537 | sch_create_and_recog_new_device(sch); | |
1538 | break; | |
1539 | } | |
1540 | rc = ccw_device_move_to_sch(cdev, sch); | |
1541 | if (rc) { | |
1542 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1543 | put_device(&cdev->dev); | |
1544 | goto out; | |
1545 | } | |
1546 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1547 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1548 | spin_unlock_irqrestore(sch->lock, flags); |
1549 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1550 | put_device(&cdev->dev); | |
91c36919 | 1551 | break; |
c820de39 CH |
1552 | default: |
1553 | break; | |
1554 | } | |
5d6e6b6f | 1555 | return 0; |
c820de39 | 1556 | |
5d6e6b6f PO |
1557 | out_unlock: |
1558 | spin_unlock_irqrestore(sch->lock, flags); | |
1559 | out: | |
1560 | return rc; | |
c820de39 CH |
1561 | } |
1562 | ||
1da177e4 LT |
1563 | #ifdef CONFIG_CCW_CONSOLE |
1564 | static struct ccw_device console_cdev; | |
1565 | static struct ccw_device_private console_private; | |
1566 | static int console_cdev_in_use; | |
1567 | ||
2ec22984 CH |
1568 | static DEFINE_SPINLOCK(ccw_console_lock); |
1569 | ||
1570 | spinlock_t * cio_get_console_lock(void) | |
1571 | { | |
1572 | return &ccw_console_lock; | |
1573 | } | |
1574 | ||
0ae7a7b2 CH |
1575 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1576 | struct subchannel *sch) | |
1da177e4 | 1577 | { |
f92519e8 | 1578 | struct io_subchannel_private *io_priv = cio_get_console_priv(); |
1da177e4 LT |
1579 | int rc; |
1580 | ||
cd6b4f27 | 1581 | /* Attach subchannel private data. */ |
f92519e8 SO |
1582 | memset(io_priv, 0, sizeof(*io_priv)); |
1583 | set_io_private(sch, io_priv); | |
0ae7a7b2 | 1584 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1585 | rc = cio_commit_config(sch); |
1586 | if (rc) | |
1587 | return rc; | |
0ae7a7b2 | 1588 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1589 | /* Initialize the ccw_device structure. */ |
292888c8 | 1590 | cdev->dev.parent= &sch->dev; |
ffa8d2a3 | 1591 | sch_set_cdev(sch, cdev); |
736b5db8 | 1592 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1593 | /* Now wait for the async. recognition to come to an end. */ |
1594 | spin_lock_irq(cdev->ccwlock); | |
1595 | while (!dev_fsm_final_state(cdev)) | |
1596 | wait_cons_dev(); | |
1597 | rc = -EIO; | |
1598 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1599 | goto out_unlock; | |
1600 | ccw_device_online(cdev); | |
1601 | while (!dev_fsm_final_state(cdev)) | |
1602 | wait_cons_dev(); | |
1603 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1604 | goto out_unlock; | |
1605 | rc = 0; | |
1606 | out_unlock: | |
1607 | spin_unlock_irq(cdev->ccwlock); | |
736b5db8 | 1608 | return rc; |
1da177e4 LT |
1609 | } |
1610 | ||
1611 | struct ccw_device * | |
1612 | ccw_device_probe_console(void) | |
1613 | { | |
1614 | struct subchannel *sch; | |
1615 | int ret; | |
1616 | ||
1617 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1618 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1619 | sch = cio_probe_console(); |
1620 | if (IS_ERR(sch)) { | |
1621 | console_cdev_in_use = 0; | |
1622 | return (void *) sch; | |
1623 | } | |
1624 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1625 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1626 | console_cdev.private = &console_private; | |
c1637532 | 1627 | console_private.cdev = &console_cdev; |
de400d6b | 1628 | console_private.int_class = IOINT_CIO; |
1da177e4 LT |
1629 | ret = ccw_device_console_enable(&console_cdev, sch); |
1630 | if (ret) { | |
1631 | cio_release_console(); | |
1632 | console_cdev_in_use = 0; | |
1633 | return ERR_PTR(ret); | |
1634 | } | |
1635 | console_cdev.online = 1; | |
1636 | return &console_cdev; | |
1637 | } | |
1f4e7eda | 1638 | |
6664845c MS |
1639 | static int ccw_device_pm_restore(struct device *dev); |
1640 | ||
1641 | int ccw_device_force_console(void) | |
1642 | { | |
1643 | if (!console_cdev_in_use) | |
1644 | return -ENODEV; | |
1645 | return ccw_device_pm_restore(&console_cdev.dev); | |
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 LT |
1679 | struct device_driver *drv; |
1680 | ||
1681 | drv = get_driver(&cdrv->driver); | |
1682 | if (!drv) | |
b0744bd2 | 1683 | return NULL; |
1da177e4 | 1684 | |
b0744bd2 CH |
1685 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1686 | __ccwdev_check_busid); | |
1da177e4 LT |
1687 | put_driver(drv); |
1688 | ||
d2c993d8 | 1689 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1690 | } |
1691 | ||
1692 | /************************** device driver handling ************************/ | |
1693 | ||
1694 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1695 | * and release methods are initially very similar to the device_driver | |
1696 | * implementations, with the difference that they have ccw_device | |
1697 | * arguments. | |
1698 | * | |
1699 | * A ccw driver also contains the information that is needed for | |
1700 | * device matching. | |
1701 | */ | |
1702 | static int | |
1703 | ccw_device_probe (struct device *dev) | |
1704 | { | |
1705 | struct ccw_device *cdev = to_ccwdev(dev); | |
1706 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1707 | int ret; | |
1708 | ||
1709 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
de400d6b PO |
1710 | /* Note: we interpret class 0 in this context as an uninitialized |
1711 | * field since it translates to a non-I/O interrupt class. */ | |
1712 | if (cdrv->int_class != 0) | |
1713 | cdev->private->int_class = cdrv->int_class; | |
1714 | else | |
1715 | cdev->private->int_class = IOINT_CIO; | |
1da177e4 LT |
1716 | |
1717 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1718 | ||
1719 | if (ret) { | |
d2c993d8 | 1720 | cdev->drv = NULL; |
de400d6b | 1721 | cdev->private->int_class = IOINT_CIO; |
1da177e4 LT |
1722 | return ret; |
1723 | } | |
1724 | ||
1725 | return 0; | |
1726 | } | |
1727 | ||
1728 | static int | |
1729 | ccw_device_remove (struct device *dev) | |
1730 | { | |
1731 | struct ccw_device *cdev = to_ccwdev(dev); | |
1732 | struct ccw_driver *cdrv = cdev->drv; | |
1733 | int ret; | |
1734 | ||
1da177e4 LT |
1735 | if (cdrv->remove) |
1736 | cdrv->remove(cdev); | |
1737 | if (cdev->online) { | |
1738 | cdev->online = 0; | |
1739 | spin_lock_irq(cdev->ccwlock); | |
1740 | ret = ccw_device_offline(cdev); | |
1741 | spin_unlock_irq(cdev->ccwlock); | |
1742 | if (ret == 0) | |
1743 | wait_event(cdev->private->wait_q, | |
1744 | dev_fsm_final_state(cdev)); | |
1745 | else | |
139b83dd | 1746 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1747 | "device 0.%x.%04x\n", |
1748 | ret, cdev->private->dev_id.ssid, | |
1749 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1750 | /* Give up reference obtained in ccw_device_set_online(). */ |
1751 | put_device(&cdev->dev); | |
1da177e4 LT |
1752 | } |
1753 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1754 | cdev->drv = NULL; |
de400d6b | 1755 | cdev->private->int_class = IOINT_CIO; |
1da177e4 LT |
1756 | return 0; |
1757 | } | |
1758 | ||
958974fb CH |
1759 | static void ccw_device_shutdown(struct device *dev) |
1760 | { | |
1761 | struct ccw_device *cdev; | |
1762 | ||
1763 | cdev = to_ccwdev(dev); | |
1764 | if (cdev->drv && cdev->drv->shutdown) | |
1765 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1766 | disable_cmf(cdev); |
958974fb CH |
1767 | } |
1768 | ||
823d494a SO |
1769 | static int ccw_device_pm_prepare(struct device *dev) |
1770 | { | |
1771 | struct ccw_device *cdev = to_ccwdev(dev); | |
1772 | ||
37de53bb | 1773 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1774 | return -EAGAIN; |
1775 | /* Fail while device is being set online/offline. */ | |
1776 | if (atomic_read(&cdev->private->onoff)) | |
1777 | return -EAGAIN; | |
1778 | ||
1779 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1780 | return cdev->drv->prepare(cdev); | |
1781 | ||
1782 | return 0; | |
1783 | } | |
1784 | ||
1785 | static void ccw_device_pm_complete(struct device *dev) | |
1786 | { | |
1787 | struct ccw_device *cdev = to_ccwdev(dev); | |
1788 | ||
1789 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1790 | cdev->drv->complete(cdev); | |
1791 | } | |
1792 | ||
1793 | static int ccw_device_pm_freeze(struct device *dev) | |
1794 | { | |
1795 | struct ccw_device *cdev = to_ccwdev(dev); | |
1796 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1797 | int ret, cm_enabled; | |
1798 | ||
1799 | /* Fail suspend while device is in transistional state. */ | |
1800 | if (!dev_fsm_final_state(cdev)) | |
1801 | return -EAGAIN; | |
1802 | if (!cdev->online) | |
1803 | return 0; | |
1804 | if (cdev->drv && cdev->drv->freeze) { | |
1805 | ret = cdev->drv->freeze(cdev); | |
1806 | if (ret) | |
1807 | return ret; | |
1808 | } | |
1809 | ||
1810 | spin_lock_irq(sch->lock); | |
1811 | cm_enabled = cdev->private->cmb != NULL; | |
1812 | spin_unlock_irq(sch->lock); | |
1813 | if (cm_enabled) { | |
1814 | /* Don't have the css write on memory. */ | |
1815 | ret = ccw_set_cmf(cdev, 0); | |
1816 | if (ret) | |
1817 | return ret; | |
1818 | } | |
1819 | /* From here on, disallow device driver I/O. */ | |
1820 | spin_lock_irq(sch->lock); | |
1821 | ret = cio_disable_subchannel(sch); | |
1822 | spin_unlock_irq(sch->lock); | |
1823 | ||
1824 | return ret; | |
1825 | } | |
1826 | ||
1827 | static int ccw_device_pm_thaw(struct device *dev) | |
1828 | { | |
1829 | struct ccw_device *cdev = to_ccwdev(dev); | |
1830 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1831 | int ret, cm_enabled; | |
1832 | ||
1833 | if (!cdev->online) | |
1834 | return 0; | |
1835 | ||
1836 | spin_lock_irq(sch->lock); | |
1837 | /* Allow device driver I/O again. */ | |
1838 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1839 | cm_enabled = cdev->private->cmb != NULL; | |
1840 | spin_unlock_irq(sch->lock); | |
1841 | if (ret) | |
1842 | return ret; | |
1843 | ||
1844 | if (cm_enabled) { | |
1845 | ret = ccw_set_cmf(cdev, 1); | |
1846 | if (ret) | |
1847 | return ret; | |
1848 | } | |
1849 | ||
1850 | if (cdev->drv && cdev->drv->thaw) | |
1851 | ret = cdev->drv->thaw(cdev); | |
1852 | ||
1853 | return ret; | |
1854 | } | |
1855 | ||
1856 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1857 | { | |
1858 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a | 1859 | |
0d01bb89 SO |
1860 | spin_lock_irq(sch->lock); |
1861 | if (cio_is_console(sch->schid)) { | |
1862 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1863 | goto out_unlock; | |
1864 | } | |
823d494a SO |
1865 | /* |
1866 | * While we were sleeping, devices may have gone or become | |
1867 | * available again. Kick re-detection. | |
1868 | */ | |
823d494a | 1869 | cdev->private->flags.resuming = 1; |
b17295e6 | 1870 | cdev->private->path_new_mask = LPM_ANYPATH; |
0d01bb89 SO |
1871 | css_schedule_eval(sch->schid); |
1872 | spin_unlock_irq(sch->lock); | |
1873 | css_complete_work(); | |
1874 | ||
1875 | /* cdev may have been moved to a different subchannel. */ | |
1876 | sch = to_subchannel(cdev->dev.parent); | |
1877 | spin_lock_irq(sch->lock); | |
1878 | if (cdev->private->state != DEV_STATE_ONLINE && | |
1879 | cdev->private->state != DEV_STATE_OFFLINE) | |
1880 | goto out_unlock; | |
1881 | ||
736b5db8 | 1882 | ccw_device_recognition(cdev); |
823d494a | 1883 | spin_unlock_irq(sch->lock); |
823d494a SO |
1884 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1885 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
0d01bb89 SO |
1886 | spin_lock_irq(sch->lock); |
1887 | ||
1888 | out_unlock: | |
823d494a | 1889 | cdev->private->flags.resuming = 0; |
0d01bb89 | 1890 | spin_unlock_irq(sch->lock); |
823d494a SO |
1891 | } |
1892 | ||
1893 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1894 | { | |
1895 | cdev->private->state = DEV_STATE_BOXED; | |
76e6fb4b | 1896 | if (ccw_device_notify(cdev, CIO_BOXED) == 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 resume_handle_disc(struct ccw_device *cdev) | |
1903 | { | |
1904 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
76e6fb4b | 1905 | if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK) |
823d494a | 1906 | return 0; |
37de53bb | 1907 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1908 | return -ENODEV; |
1909 | } | |
1910 | ||
1911 | static int ccw_device_pm_restore(struct device *dev) | |
1912 | { | |
1913 | struct ccw_device *cdev = to_ccwdev(dev); | |
0d01bb89 SO |
1914 | struct subchannel *sch; |
1915 | int ret = 0; | |
823d494a SO |
1916 | |
1917 | __ccw_device_pm_restore(cdev); | |
0d01bb89 | 1918 | sch = to_subchannel(cdev->dev.parent); |
823d494a | 1919 | spin_lock_irq(sch->lock); |
0d01bb89 | 1920 | if (cio_is_console(sch->schid)) |
823d494a | 1921 | goto out_restore; |
0d01bb89 | 1922 | |
823d494a SO |
1923 | /* check recognition results */ |
1924 | switch (cdev->private->state) { | |
1925 | case DEV_STATE_OFFLINE: | |
0d01bb89 SO |
1926 | case DEV_STATE_ONLINE: |
1927 | cdev->private->flags.donotify = 0; | |
823d494a SO |
1928 | break; |
1929 | case DEV_STATE_BOXED: | |
1930 | ret = resume_handle_boxed(cdev); | |
823d494a | 1931 | if (ret) |
0d01bb89 | 1932 | goto out_unlock; |
823d494a | 1933 | goto out_restore; |
823d494a | 1934 | default: |
0d01bb89 SO |
1935 | ret = resume_handle_disc(cdev); |
1936 | if (ret) | |
1937 | goto out_unlock; | |
1938 | goto out_restore; | |
823d494a SO |
1939 | } |
1940 | /* check if the device type has changed */ | |
1941 | if (!ccw_device_test_sense_data(cdev)) { | |
1942 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1943 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1944 | ret = -ENODEV; |
1945 | goto out_unlock; | |
1946 | } | |
0d01bb89 | 1947 | if (!cdev->online) |
823d494a | 1948 | goto out_unlock; |
823d494a | 1949 | |
0d01bb89 SO |
1950 | if (ccw_device_online(cdev)) { |
1951 | ret = resume_handle_disc(cdev); | |
1952 | if (ret) | |
1953 | goto out_unlock; | |
1954 | goto out_restore; | |
1955 | } | |
823d494a | 1956 | spin_unlock_irq(sch->lock); |
823d494a | 1957 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
0d01bb89 SO |
1958 | spin_lock_irq(sch->lock); |
1959 | ||
1960 | if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) { | |
1961 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1962 | ret = -ENODEV; | |
1963 | goto out_unlock; | |
823d494a | 1964 | } |
0d01bb89 SO |
1965 | |
1966 | /* reenable cmf, if needed */ | |
1967 | if (cdev->private->cmb) { | |
1968 | spin_unlock_irq(sch->lock); | |
823d494a | 1969 | ret = ccw_set_cmf(cdev, 1); |
0d01bb89 | 1970 | spin_lock_irq(sch->lock); |
823d494a | 1971 | if (ret) { |
f014824e SO |
1972 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1973 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1974 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1975 | ret = 0; |
1976 | } | |
1977 | } | |
1978 | ||
1979 | out_restore: | |
0d01bb89 | 1980 | spin_unlock_irq(sch->lock); |
823d494a SO |
1981 | if (cdev->online && cdev->drv && cdev->drv->restore) |
1982 | ret = cdev->drv->restore(cdev); | |
823d494a SO |
1983 | return ret; |
1984 | ||
823d494a SO |
1985 | out_unlock: |
1986 | spin_unlock_irq(sch->lock); | |
1987 | return ret; | |
1988 | } | |
1989 | ||
47145210 | 1990 | static const struct dev_pm_ops ccw_pm_ops = { |
823d494a SO |
1991 | .prepare = ccw_device_pm_prepare, |
1992 | .complete = ccw_device_pm_complete, | |
1993 | .freeze = ccw_device_pm_freeze, | |
1994 | .thaw = ccw_device_pm_thaw, | |
1995 | .restore = ccw_device_pm_restore, | |
1996 | }; | |
1997 | ||
d5ab5276 | 1998 | static struct bus_type ccw_bus_type = { |
8bbace7e CH |
1999 | .name = "ccw", |
2000 | .match = ccw_bus_match, | |
2001 | .uevent = ccw_uevent, | |
2002 | .probe = ccw_device_probe, | |
2003 | .remove = ccw_device_remove, | |
958974fb | 2004 | .shutdown = ccw_device_shutdown, |
823d494a | 2005 | .pm = &ccw_pm_ops, |
8bbace7e CH |
2006 | }; |
2007 | ||
b2ffd8e9 CH |
2008 | /** |
2009 | * ccw_driver_register() - register a ccw driver | |
2010 | * @cdriver: driver to be registered | |
2011 | * | |
2012 | * This function is mainly a wrapper around driver_register(). | |
2013 | * Returns: | |
2014 | * %0 on success and a negative error value on failure. | |
2015 | */ | |
2016 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2017 | { |
2018 | struct device_driver *drv = &cdriver->driver; | |
2019 | ||
2020 | drv->bus = &ccw_bus_type; | |
1da177e4 LT |
2021 | |
2022 | return driver_register(drv); | |
2023 | } | |
2024 | ||
b2ffd8e9 CH |
2025 | /** |
2026 | * ccw_driver_unregister() - deregister a ccw driver | |
2027 | * @cdriver: driver to be deregistered | |
2028 | * | |
2029 | * This function is mainly a wrapper around driver_unregister(). | |
2030 | */ | |
2031 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2032 | { |
2033 | driver_unregister(&cdriver->driver); | |
2034 | } | |
2035 | ||
a8237fc4 CH |
2036 | /* Helper func for qdio. */ |
2037 | struct subchannel_id | |
2038 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
2039 | { | |
2040 | struct subchannel *sch; | |
2041 | ||
2042 | sch = to_subchannel(cdev->dev.parent); | |
2043 | return sch->schid; | |
2044 | } | |
2045 | ||
37de53bb PO |
2046 | static void ccw_device_todo(struct work_struct *work) |
2047 | { | |
2048 | struct ccw_device_private *priv; | |
2049 | struct ccw_device *cdev; | |
2050 | struct subchannel *sch; | |
2051 | enum cdev_todo todo; | |
2052 | ||
2053 | priv = container_of(work, struct ccw_device_private, todo_work); | |
2054 | cdev = priv->cdev; | |
2055 | sch = to_subchannel(cdev->dev.parent); | |
2056 | /* Find out todo. */ | |
2057 | spin_lock_irq(cdev->ccwlock); | |
2058 | todo = priv->todo; | |
2059 | priv->todo = CDEV_TODO_NOTHING; | |
2060 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
2061 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
2062 | spin_unlock_irq(cdev->ccwlock); | |
2063 | /* Perform todo. */ | |
2064 | switch (todo) { | |
2065 | case CDEV_TODO_ENABLE_CMF: | |
2066 | cmf_reenable(cdev); | |
2067 | break; | |
2068 | case CDEV_TODO_REBIND: | |
2069 | ccw_device_do_unbind_bind(cdev); | |
2070 | break; | |
2071 | case CDEV_TODO_REGISTER: | |
2072 | io_subchannel_register(cdev); | |
2073 | break; | |
2074 | case CDEV_TODO_UNREG_EVAL: | |
2075 | if (!sch_is_pseudo_sch(sch)) | |
2076 | css_schedule_eval(sch->schid); | |
2077 | /* fall-through */ | |
2078 | case CDEV_TODO_UNREG: | |
2079 | if (sch_is_pseudo_sch(sch)) | |
2080 | ccw_device_unregister(cdev); | |
2081 | else | |
2082 | ccw_device_call_sch_unregister(cdev); | |
2083 | break; | |
2084 | default: | |
2085 | break; | |
2086 | } | |
2087 | /* Release workqueue ref. */ | |
2088 | put_device(&cdev->dev); | |
2089 | } | |
2090 | ||
2091 | /** | |
2092 | * ccw_device_sched_todo - schedule ccw device operation | |
2093 | * @cdev: ccw device | |
2094 | * @todo: todo | |
2095 | * | |
2096 | * Schedule the operation identified by @todo to be performed on the slow path | |
2097 | * workqueue. Do nothing if another operation with higher priority is already | |
2098 | * scheduled. Needs to be called with ccwdev lock held. | |
2099 | */ | |
2100 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2101 | { | |
2102 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2103 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2104 | todo); | |
2105 | if (cdev->private->todo >= todo) | |
2106 | return; | |
2107 | cdev->private->todo = todo; | |
2108 | /* Get workqueue ref. */ | |
2109 | if (!get_device(&cdev->dev)) | |
2110 | return; | |
be5d3823 | 2111 | if (!queue_work(cio_work_q, &cdev->private->todo_work)) { |
37de53bb PO |
2112 | /* Already queued, release workqueue ref. */ |
2113 | put_device(&cdev->dev); | |
2114 | } | |
2115 | } | |
2116 | ||
fd0457a6 ME |
2117 | /** |
2118 | * ccw_device_siosl() - initiate logging | |
2119 | * @cdev: ccw device | |
2120 | * | |
2121 | * This function is used to invoke model-dependent logging within the channel | |
2122 | * subsystem. | |
2123 | */ | |
2124 | int ccw_device_siosl(struct ccw_device *cdev) | |
2125 | { | |
2126 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2127 | ||
2128 | return chsc_siosl(sch->schid); | |
2129 | } | |
2130 | EXPORT_SYMBOL_GPL(ccw_device_siosl); | |
2131 | ||
1da177e4 LT |
2132 | MODULE_LICENSE("GPL"); |
2133 | EXPORT_SYMBOL(ccw_device_set_online); | |
2134 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2135 | EXPORT_SYMBOL(ccw_driver_register); | |
2136 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2137 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
a8237fc4 | 2138 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |