Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * bus driver for ccw devices |
1da177e4 | 3 | * |
a53c8fab | 4 | * Copyright IBM Corp. 2002, 2008 |
1da177e4 | 5 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
4ce3b30c | 6 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
7 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
8 | */ | |
a7ae2c02 PO |
9 | |
10 | #define KMSG_COMPONENT "cio" | |
11 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
12 | ||
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/workqueue.h> | |
188561a4 | 22 | #include <linux/delay.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 | ||
84c57ad5 SO |
636 | static ssize_t vpm_show(struct device *dev, struct device_attribute *attr, |
637 | char *buf) | |
638 | { | |
639 | struct subchannel *sch = to_subchannel(dev); | |
640 | ||
641 | return sprintf(buf, "%02x\n", sch->vpm); | |
642 | } | |
643 | ||
1da177e4 LT |
644 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); |
645 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
646 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
647 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 648 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 649 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 | 650 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
fd0457a6 | 651 | static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); |
84c57ad5 | 652 | static DEVICE_ATTR(vpm, 0444, vpm_show, NULL); |
1da177e4 | 653 | |
7e9db9ea | 654 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
655 | &dev_attr_chpids.attr, |
656 | &dev_attr_pimpampom.attr, | |
fd0457a6 | 657 | &dev_attr_logging.attr, |
84c57ad5 | 658 | &dev_attr_vpm.attr, |
1da177e4 LT |
659 | NULL, |
660 | }; | |
661 | ||
7e9db9ea CH |
662 | static struct attribute_group io_subchannel_attr_group = { |
663 | .attrs = io_subchannel_attrs, | |
529192f3 | 664 | }; |
1da177e4 LT |
665 | |
666 | static struct attribute * ccwdev_attrs[] = { | |
667 | &dev_attr_devtype.attr, | |
668 | &dev_attr_cutype.attr, | |
f1fc78a8 | 669 | &dev_attr_modalias.attr, |
1da177e4 LT |
670 | &dev_attr_online.attr, |
671 | &dev_attr_cmb_enable.attr, | |
672 | &dev_attr_availability.attr, | |
673 | NULL, | |
674 | }; | |
675 | ||
676 | static struct attribute_group ccwdev_attr_group = { | |
677 | .attrs = ccwdev_attrs, | |
678 | }; | |
679 | ||
a4dbd674 | 680 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
681 | &ccwdev_attr_group, |
682 | NULL, | |
683 | }; | |
1da177e4 LT |
684 | |
685 | /* this is a simple abstraction for device_register that sets the | |
686 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 687 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
688 | { |
689 | struct device *dev = &cdev->dev; | |
690 | int ret; | |
691 | ||
692 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
693 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
694 | cdev->private->dev_id.devno); | |
695 | if (ret) | |
696 | return ret; | |
7d253b9a | 697 | return device_add(dev); |
1da177e4 LT |
698 | } |
699 | ||
5d6e6b6f | 700 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 701 | { |
5d6e6b6f PO |
702 | struct ccw_device *cdev = to_ccwdev(dev); |
703 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 704 | |
d7b5a4c9 CH |
705 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
706 | } | |
707 | ||
b7a610f7 SO |
708 | /** |
709 | * get_ccwdev_by_dev_id() - obtain device from a ccw device id | |
710 | * @dev_id: id of the device to be searched | |
711 | * | |
712 | * This function searches all devices attached to the ccw bus for a device | |
713 | * matching @dev_id. | |
714 | * Returns: | |
715 | * If a device is found its reference count is increased and returned; | |
716 | * else %NULL is returned. | |
717 | */ | |
718 | struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) | |
d7b5a4c9 CH |
719 | { |
720 | struct device *dev; | |
721 | ||
5d6e6b6f | 722 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
723 | |
724 | return dev ? to_ccwdev(dev) : NULL; | |
725 | } | |
b7a610f7 | 726 | EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id); |
d7b5a4c9 | 727 | |
37de53bb | 728 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 729 | { |
eb32ae8d | 730 | int ret; |
1da177e4 | 731 | |
7d253b9a | 732 | if (device_is_registered(&cdev->dev)) { |
eb32ae8d CH |
733 | device_release_driver(&cdev->dev); |
734 | ret = device_attach(&cdev->dev); | |
735 | WARN_ON(ret == -ENODEV); | |
736 | } | |
1da177e4 LT |
737 | } |
738 | ||
739 | static void | |
740 | ccw_device_release(struct device *dev) | |
741 | { | |
742 | struct ccw_device *cdev; | |
743 | ||
744 | cdev = to_ccwdev(dev); | |
6eff208f CH |
745 | /* Release reference of parent subchannel. */ |
746 | put_device(cdev->dev.parent); | |
1da177e4 LT |
747 | kfree(cdev->private); |
748 | kfree(cdev); | |
749 | } | |
750 | ||
7674da77 CH |
751 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
752 | { | |
753 | struct ccw_device *cdev; | |
754 | ||
755 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
756 | if (cdev) { | |
757 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
758 | GFP_KERNEL | GFP_DMA); | |
759 | if (cdev->private) | |
760 | return cdev; | |
761 | } | |
762 | kfree(cdev); | |
763 | return ERR_PTR(-ENOMEM); | |
764 | } | |
765 | ||
37de53bb PO |
766 | static void ccw_device_todo(struct work_struct *work); |
767 | ||
7674da77 CH |
768 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
769 | struct ccw_device *cdev) | |
770 | { | |
771 | cdev->private->cdev = cdev; | |
420f42ec | 772 | cdev->private->int_class = IRQIO_CIO; |
7674da77 CH |
773 | atomic_set(&cdev->private->onoff, 0); |
774 | cdev->dev.parent = &sch->dev; | |
775 | cdev->dev.release = ccw_device_release; | |
37de53bb | 776 | INIT_WORK(&cdev->private->todo_work, ccw_device_todo); |
ef99516c | 777 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
778 | /* Do first half of device_register. */ |
779 | device_initialize(&cdev->dev); | |
780 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
781 | /* Release reference from device_initialize(). */ |
782 | put_device(&cdev->dev); | |
7674da77 CH |
783 | return -ENODEV; |
784 | } | |
24a1872d | 785 | cdev->private->flags.initialized = 1; |
7674da77 CH |
786 | return 0; |
787 | } | |
788 | ||
789 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
790 | { | |
791 | struct ccw_device *cdev; | |
792 | int ret; | |
793 | ||
794 | cdev = io_subchannel_allocate_dev(sch); | |
795 | if (!IS_ERR(cdev)) { | |
796 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 797 | if (ret) |
7674da77 | 798 | cdev = ERR_PTR(ret); |
7674da77 CH |
799 | } |
800 | return cdev; | |
801 | } | |
802 | ||
736b5db8 | 803 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 804 | |
d7b5a4c9 CH |
805 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
806 | { | |
807 | struct ccw_device *cdev; | |
808 | ||
809 | /* Need to allocate a new ccw device. */ | |
810 | cdev = io_subchannel_create_ccwdev(sch); | |
811 | if (IS_ERR(cdev)) { | |
812 | /* OK, we did everything we could... */ | |
813 | css_sch_device_unregister(sch); | |
814 | return; | |
815 | } | |
d7b5a4c9 | 816 | /* Start recognition for the new ccw device. */ |
736b5db8 | 817 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
818 | } |
819 | ||
1da177e4 LT |
820 | /* |
821 | * Register recognized device. | |
822 | */ | |
37de53bb | 823 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 824 | { |
1da177e4 | 825 | struct subchannel *sch; |
a290156f | 826 | int ret, adjust_init_count = 1; |
1da177e4 LT |
827 | unsigned long flags; |
828 | ||
1da177e4 | 829 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
830 | /* |
831 | * Check if subchannel is still registered. It may have become | |
832 | * unregistered if a machine check hit us after finishing | |
833 | * device recognition but before the register work could be | |
834 | * queued. | |
835 | */ | |
836 | if (!device_is_registered(&sch->dev)) | |
837 | goto out_err; | |
82b7ac05 | 838 | css_update_ssd_info(sch); |
47af5518 CH |
839 | /* |
840 | * io_subchannel_register() will also be called after device | |
841 | * recognition has been done for a boxed device (which will already | |
842 | * be registered). We need to reprobe since we may now have sense id | |
843 | * information. | |
844 | */ | |
d6a30761 | 845 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
846 | if (!cdev->drv) { |
847 | ret = device_reprobe(&cdev->dev); | |
848 | if (ret) | |
849 | /* We can't do much here. */ | |
139b83dd | 850 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
851 | " %d for 0.%x.%04x\n", ret, |
852 | cdev->private->dev_id.ssid, | |
853 | cdev->private->dev_id.devno); | |
47af5518 | 854 | } |
a290156f | 855 | adjust_init_count = 0; |
1da177e4 LT |
856 | goto out; |
857 | } | |
fa1a8c23 CH |
858 | /* |
859 | * Now we know this subchannel will stay, we can throw | |
860 | * our delayed uevent. | |
861 | */ | |
f67f129e | 862 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 863 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
864 | /* make it known to the system */ |
865 | ret = ccw_device_register(cdev); | |
866 | if (ret) { | |
e556bbbd CH |
867 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
868 | cdev->private->dev_id.ssid, | |
869 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 870 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 871 | sch_set_cdev(sch, NULL); |
2ec22984 | 872 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
873 | /* Release initial device reference. */ |
874 | put_device(&cdev->dev); | |
5fb6b854 | 875 | goto out_err; |
1da177e4 | 876 | } |
1da177e4 LT |
877 | out: |
878 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 879 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 880 | out_err: |
a290156f | 881 | if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count)) |
1da177e4 LT |
882 | wake_up(&ccw_device_init_wq); |
883 | } | |
884 | ||
37de53bb | 885 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 886 | { |
1da177e4 LT |
887 | struct subchannel *sch; |
888 | ||
46fbe4e4 PO |
889 | /* Get subchannel reference for local processing. */ |
890 | if (!get_device(cdev->dev.parent)) | |
891 | return; | |
1da177e4 | 892 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 893 | css_sch_device_unregister(sch); |
46fbe4e4 | 894 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
895 | put_device(&sch->dev); |
896 | } | |
897 | ||
898 | /* | |
899 | * subchannel recognition done. Called from the state machine. | |
900 | */ | |
901 | void | |
902 | io_subchannel_recog_done(struct ccw_device *cdev) | |
903 | { | |
1da177e4 LT |
904 | if (css_init_done == 0) { |
905 | cdev->private->flags.recog_done = 1; | |
906 | return; | |
907 | } | |
908 | switch (cdev->private->state) { | |
47593bfa SO |
909 | case DEV_STATE_BOXED: |
910 | /* Device did not respond in time. */ | |
1da177e4 LT |
911 | case DEV_STATE_NOT_OPER: |
912 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
913 | /* Remove device found not operational. */ |
914 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
915 | if (atomic_dec_and_test(&ccw_device_init_count)) |
916 | wake_up(&ccw_device_init_wq); | |
917 | break; | |
1da177e4 LT |
918 | case DEV_STATE_OFFLINE: |
919 | /* | |
920 | * We can't register the device in interrupt context so | |
921 | * we schedule a work item. | |
922 | */ | |
37de53bb | 923 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
924 | break; |
925 | } | |
926 | } | |
927 | ||
736b5db8 | 928 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 929 | { |
1da177e4 LT |
930 | struct ccw_device_private *priv; |
931 | ||
2ec22984 | 932 | cdev->ccwlock = sch->lock; |
fb6958a5 | 933 | |
1da177e4 LT |
934 | /* Init private data. */ |
935 | priv = cdev->private; | |
78964268 CH |
936 | priv->dev_id.devno = sch->schib.pmcw.dev; |
937 | priv->dev_id.ssid = sch->schid.ssid; | |
938 | priv->schid = sch->schid; | |
1da177e4 LT |
939 | priv->state = DEV_STATE_NOT_OPER; |
940 | INIT_LIST_HEAD(&priv->cmb_list); | |
941 | init_waitqueue_head(&priv->wait_q); | |
942 | init_timer(&priv->timer); | |
943 | ||
1da177e4 LT |
944 | /* Increase counter of devices currently in recognition. */ |
945 | atomic_inc(&ccw_device_init_count); | |
946 | ||
947 | /* Start async. device sensing. */ | |
2ec22984 | 948 | spin_lock_irq(sch->lock); |
60e4dac1 | 949 | sch_set_cdev(sch, cdev); |
736b5db8 | 950 | ccw_device_recognition(cdev); |
2ec22984 | 951 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
952 | } |
953 | ||
5d6e6b6f PO |
954 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
955 | struct subchannel *sch) | |
d7b5a4c9 | 956 | { |
5d6e6b6f | 957 | struct subchannel *old_sch; |
0c609fca | 958 | int rc, old_enabled = 0; |
d7b5a4c9 | 959 | |
5d6e6b6f PO |
960 | old_sch = to_subchannel(cdev->dev.parent); |
961 | /* Obtain child reference for new parent. */ | |
6eff208f | 962 | if (!get_device(&sch->dev)) |
5d6e6b6f | 963 | return -ENODEV; |
0c609fca SO |
964 | |
965 | if (!sch_is_pseudo_sch(old_sch)) { | |
966 | spin_lock_irq(old_sch->lock); | |
967 | old_enabled = old_sch->schib.pmcw.ena; | |
968 | rc = 0; | |
969 | if (old_enabled) | |
970 | rc = cio_disable_subchannel(old_sch); | |
971 | spin_unlock_irq(old_sch->lock); | |
972 | if (rc == -EBUSY) { | |
973 | /* Release child reference for new parent. */ | |
974 | put_device(&sch->dev); | |
975 | return rc; | |
976 | } | |
977 | } | |
978 | ||
d7b5a4c9 | 979 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 980 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
981 | mutex_unlock(&sch->reg_mutex); |
982 | if (rc) { | |
5d6e6b6f | 983 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
984 | cdev->private->dev_id.ssid, |
985 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f | 986 | sch->schib.pmcw.dev, rc); |
0c609fca SO |
987 | if (old_enabled) { |
988 | /* Try to reenable the old subchannel. */ | |
989 | spin_lock_irq(old_sch->lock); | |
990 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
991 | spin_unlock_irq(old_sch->lock); | |
992 | } | |
5d6e6b6f | 993 | /* Release child reference for new parent. */ |
6eff208f | 994 | put_device(&sch->dev); |
5d6e6b6f | 995 | return rc; |
d7b5a4c9 | 996 | } |
5d6e6b6f PO |
997 | /* Clean up old subchannel. */ |
998 | if (!sch_is_pseudo_sch(old_sch)) { | |
999 | spin_lock_irq(old_sch->lock); | |
1000 | sch_set_cdev(old_sch, NULL); | |
5d6e6b6f PO |
1001 | spin_unlock_irq(old_sch->lock); |
1002 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 1003 | } |
5d6e6b6f PO |
1004 | /* Release child reference for old parent. */ |
1005 | put_device(&old_sch->dev); | |
1006 | /* Initialize new subchannel. */ | |
1007 | spin_lock_irq(sch->lock); | |
1008 | cdev->private->schid = sch->schid; | |
1009 | cdev->ccwlock = sch->lock; | |
1010 | if (!sch_is_pseudo_sch(sch)) | |
1011 | sch_set_cdev(sch, cdev); | |
1012 | spin_unlock_irq(sch->lock); | |
1013 | if (!sch_is_pseudo_sch(sch)) | |
1014 | css_update_ssd_info(sch); | |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
1019 | { | |
1020 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1021 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
1022 | ||
1023 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
1024 | } |
1025 | ||
602b20f2 CH |
1026 | static void io_subchannel_irq(struct subchannel *sch) |
1027 | { | |
1028 | struct ccw_device *cdev; | |
1029 | ||
db6a6423 | 1030 | cdev = sch_get_cdev(sch); |
602b20f2 | 1031 | |
efd986db SO |
1032 | CIO_TRACE_EVENT(6, "IRQ"); |
1033 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
1034 | if (cdev) |
1035 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
de400d6b | 1036 | else |
420f42ec | 1037 | inc_irq_stat(IRQIO_CIO); |
602b20f2 CH |
1038 | } |
1039 | ||
13952ec1 SO |
1040 | void io_subchannel_init_config(struct subchannel *sch) |
1041 | { | |
1042 | memset(&sch->config, 0, sizeof(sch->config)); | |
1043 | sch->config.csense = 1; | |
13952ec1 SO |
1044 | } |
1045 | ||
0ae7a7b2 CH |
1046 | static void io_subchannel_init_fields(struct subchannel *sch) |
1047 | { | |
1048 | if (cio_is_console(sch->schid)) | |
1049 | sch->opm = 0xff; | |
1050 | else | |
1051 | sch->opm = chp_get_sch_opm(sch); | |
1052 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1053 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1054 | |
1055 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1056 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1057 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1058 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1059 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1060 | |
1061 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1062 | } |
1063 | ||
90ed2b69 CH |
1064 | /* |
1065 | * Note: We always return 0 so that we bind to the device even on error. | |
1066 | * This is needed so that our remove function is called on unregister. | |
1067 | */ | |
0ae7a7b2 | 1068 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1069 | { |
f92519e8 | 1070 | struct io_subchannel_private *io_priv; |
1da177e4 LT |
1071 | struct ccw_device *cdev; |
1072 | int rc; | |
1da177e4 | 1073 | |
6d7c5afc | 1074 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1075 | rc = sysfs_create_group(&sch->dev.kobj, |
1076 | &io_subchannel_attr_group); | |
1077 | if (rc) | |
1078 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1079 | "attributes for subchannel " | |
1080 | "0.%x.%04x (rc=%d)\n", | |
1081 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1082 | /* |
6d7c5afc | 1083 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1084 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1085 | * the ccw_device and exit. |
1da177e4 | 1086 | */ |
f67f129e | 1087 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1088 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1089 | cdev = sch_get_cdev(sch); |
afdfed0f SO |
1090 | rc = ccw_device_register(cdev); |
1091 | if (rc) { | |
1092 | /* Release online reference. */ | |
1093 | put_device(&cdev->dev); | |
1094 | goto out_schedule; | |
1095 | } | |
1da177e4 LT |
1096 | return 0; |
1097 | } | |
0ae7a7b2 | 1098 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1099 | rc = cio_commit_config(sch); |
1100 | if (rc) | |
1101 | goto out_schedule; | |
7e9db9ea CH |
1102 | rc = sysfs_create_group(&sch->dev.kobj, |
1103 | &io_subchannel_attr_group); | |
1104 | if (rc) | |
90ed2b69 | 1105 | goto out_schedule; |
cd6b4f27 | 1106 | /* Allocate I/O subchannel private data. */ |
f92519e8 SO |
1107 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); |
1108 | if (!io_priv) | |
48e4c385 | 1109 | goto out_schedule; |
f92519e8 SO |
1110 | |
1111 | set_io_private(sch, io_priv); | |
5d6e6b6f | 1112 | css_schedule_eval(sch->schid); |
7e9db9ea | 1113 | return 0; |
48e4c385 | 1114 | |
90ed2b69 | 1115 | out_schedule: |
390935ac PO |
1116 | spin_lock_irq(sch->lock); |
1117 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1118 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1119 | return 0; |
1da177e4 LT |
1120 | } |
1121 | ||
1da177e4 | 1122 | static int |
8bbace7e | 1123 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 | 1124 | { |
f92519e8 | 1125 | struct io_subchannel_private *io_priv = to_io_private(sch); |
1da177e4 | 1126 | struct ccw_device *cdev; |
1da177e4 | 1127 | |
db6a6423 CH |
1128 | cdev = sch_get_cdev(sch); |
1129 | if (!cdev) | |
48e4c385 | 1130 | goto out_free; |
6e9a0f67 | 1131 | io_subchannel_quiesce(sch); |
1da177e4 | 1132 | /* Set ccw device to not operational and drop reference. */ |
7a8ad100 | 1133 | spin_lock_irq(cdev->ccwlock); |
db6a6423 | 1134 | sch_set_cdev(sch, NULL); |
f92519e8 | 1135 | set_io_private(sch, NULL); |
1da177e4 | 1136 | cdev->private->state = DEV_STATE_NOT_OPER; |
7a8ad100 | 1137 | spin_unlock_irq(cdev->ccwlock); |
ef99516c | 1138 | ccw_device_unregister(cdev); |
48e4c385 | 1139 | out_free: |
f92519e8 | 1140 | kfree(io_priv); |
7e9db9ea | 1141 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1142 | return 0; |
1143 | } | |
1144 | ||
602b20f2 | 1145 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1146 | { |
1147 | struct ccw_device *cdev; | |
1148 | ||
db6a6423 | 1149 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1150 | if (cdev) |
1151 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1152 | } | |
1153 | ||
c820de39 CH |
1154 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1155 | { | |
1156 | struct ccw_device *cdev; | |
1157 | ||
1158 | cdev = sch_get_cdev(sch); | |
1159 | if (!cdev) | |
1160 | return; | |
4257aaec PO |
1161 | if (cio_update_schib(sch)) |
1162 | goto err; | |
1163 | /* Check for I/O on path. */ | |
1164 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1165 | goto out; | |
1166 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1167 | ccw_device_kill_io(cdev); | |
1168 | goto out; | |
1169 | } | |
1170 | if (cio_clear(sch)) | |
1171 | goto err; | |
1172 | out: | |
1173 | /* Trigger path verification. */ | |
1174 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1175 | return; | |
c820de39 | 1176 | |
4257aaec PO |
1177 | err: |
1178 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1179 | } |
1180 | ||
99611f87 CH |
1181 | static int io_subchannel_chp_event(struct subchannel *sch, |
1182 | struct chp_link *link, int event) | |
c820de39 | 1183 | { |
585b954e | 1184 | struct ccw_device *cdev = sch_get_cdev(sch); |
c820de39 | 1185 | int mask; |
c820de39 | 1186 | |
99611f87 | 1187 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1188 | if (!mask) |
1189 | return 0; | |
1190 | switch (event) { | |
1191 | case CHP_VARY_OFF: | |
1192 | sch->opm &= ~mask; | |
1193 | sch->lpm &= ~mask; | |
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_VARY_ON: | |
1199 | sch->opm |= mask; | |
1200 | sch->lpm |= mask; | |
585b954e SO |
1201 | if (cdev) |
1202 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1203 | io_subchannel_verify(sch); |
1204 | break; | |
1205 | case CHP_OFFLINE: | |
cdb912a4 | 1206 | if (cio_update_schib(sch)) |
c820de39 | 1207 | return -ENODEV; |
585b954e SO |
1208 | if (cdev) |
1209 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1210 | io_subchannel_terminate_path(sch, mask); |
1211 | break; | |
1212 | case CHP_ONLINE: | |
cdb912a4 SO |
1213 | if (cio_update_schib(sch)) |
1214 | return -ENODEV; | |
c820de39 | 1215 | sch->lpm |= mask & sch->opm; |
585b954e SO |
1216 | if (cdev) |
1217 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1218 | io_subchannel_verify(sch); |
1219 | break; | |
1220 | } | |
1221 | return 0; | |
1222 | } | |
1223 | ||
6e9a0f67 | 1224 | static void io_subchannel_quiesce(struct subchannel *sch) |
1da177e4 | 1225 | { |
1da177e4 LT |
1226 | struct ccw_device *cdev; |
1227 | int ret; | |
1228 | ||
56e6b796 | 1229 | spin_lock_irq(sch->lock); |
db6a6423 | 1230 | cdev = sch_get_cdev(sch); |
a8237fc4 | 1231 | if (cio_is_console(sch->schid)) |
56e6b796 | 1232 | goto out_unlock; |
1da177e4 | 1233 | if (!sch->schib.pmcw.ena) |
56e6b796 | 1234 | goto out_unlock; |
1da177e4 LT |
1235 | ret = cio_disable_subchannel(sch); |
1236 | if (ret != -EBUSY) | |
56e6b796 | 1237 | goto out_unlock; |
1da177e4 | 1238 | if (cdev->handler) |
56e6b796 SO |
1239 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); |
1240 | while (ret == -EBUSY) { | |
1241 | cdev->private->state = DEV_STATE_QUIESCE; | |
376ae475 | 1242 | cdev->private->iretry = 255; |
56e6b796 SO |
1243 | ret = ccw_device_cancel_halt_clear(cdev); |
1244 | if (ret == -EBUSY) { | |
1245 | ccw_device_set_timeout(cdev, HZ/10); | |
1246 | spin_unlock_irq(sch->lock); | |
1247 | wait_event(cdev->private->wait_q, | |
1248 | cdev->private->state != DEV_STATE_QUIESCE); | |
1249 | spin_lock_irq(sch->lock); | |
1250 | } | |
1251 | ret = cio_disable_subchannel(sch); | |
1da177e4 | 1252 | } |
56e6b796 SO |
1253 | out_unlock: |
1254 | spin_unlock_irq(sch->lock); | |
1da177e4 LT |
1255 | } |
1256 | ||
6e9a0f67 SO |
1257 | static void io_subchannel_shutdown(struct subchannel *sch) |
1258 | { | |
1259 | io_subchannel_quiesce(sch); | |
1260 | } | |
1261 | ||
c820de39 CH |
1262 | static int device_is_disconnected(struct ccw_device *cdev) |
1263 | { | |
1264 | if (!cdev) | |
1265 | return 0; | |
1266 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1267 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1268 | } | |
1269 | ||
1270 | static int recovery_check(struct device *dev, void *data) | |
1271 | { | |
1272 | struct ccw_device *cdev = to_ccwdev(dev); | |
1273 | int *redo = data; | |
1274 | ||
1275 | spin_lock_irq(cdev->ccwlock); | |
1276 | switch (cdev->private->state) { | |
1277 | case DEV_STATE_DISCONNECTED: | |
1278 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1279 | cdev->private->dev_id.ssid, | |
1280 | cdev->private->dev_id.devno); | |
1281 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1282 | *redo = 1; | |
1283 | break; | |
1284 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1285 | *redo = 1; | |
1286 | break; | |
1287 | } | |
1288 | spin_unlock_irq(cdev->ccwlock); | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | static void recovery_work_func(struct work_struct *unused) | |
1294 | { | |
1295 | int redo = 0; | |
1296 | ||
1297 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1298 | if (redo) { | |
1299 | spin_lock_irq(&recovery_lock); | |
1300 | if (!timer_pending(&recovery_timer)) { | |
1301 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1302 | recovery_phase++; | |
1303 | mod_timer(&recovery_timer, jiffies + | |
1304 | recovery_delay[recovery_phase] * HZ); | |
1305 | } | |
1306 | spin_unlock_irq(&recovery_lock); | |
1307 | } else | |
1308 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1309 | } | |
1310 | ||
1311 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1312 | ||
1313 | static void recovery_func(unsigned long data) | |
1314 | { | |
1315 | /* | |
1316 | * We can't do our recovery in softirq context and it's not | |
1317 | * performance critical, so we schedule it. | |
1318 | */ | |
1319 | schedule_work(&recovery_work); | |
1320 | } | |
1321 | ||
1322 | static void ccw_device_schedule_recovery(void) | |
1323 | { | |
1324 | unsigned long flags; | |
1325 | ||
1326 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1327 | spin_lock_irqsave(&recovery_lock, flags); | |
1328 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1329 | recovery_phase = 0; | |
1330 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1331 | } | |
1332 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1333 | } | |
1334 | ||
ecf5d9ef PO |
1335 | static int purge_fn(struct device *dev, void *data) |
1336 | { | |
1337 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1338 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1339 | |
1340 | spin_lock_irq(cdev->ccwlock); | |
37de53bb | 1341 | if (is_blacklisted(id->ssid, id->devno) && |
a2fc8485 PO |
1342 | (cdev->private->state == DEV_STATE_OFFLINE) && |
1343 | (atomic_cmpxchg(&cdev->private->onoff, 0, 1) == 0)) { | |
37de53bb PO |
1344 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, |
1345 | id->devno); | |
1346 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
a2fc8485 | 1347 | atomic_set(&cdev->private->onoff, 0); |
37de53bb | 1348 | } |
ecf5d9ef | 1349 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1350 | /* Abort loop in case of pending signal. */ |
1351 | if (signal_pending(current)) | |
1352 | return -EINTR; | |
1353 | ||
1354 | return 0; | |
1355 | } | |
1356 | ||
1357 | /** | |
1358 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1359 | * | |
1360 | * Unregister all ccw devices that are offline and on the blacklist. | |
1361 | */ | |
1362 | int ccw_purge_blacklisted(void) | |
1363 | { | |
1364 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1365 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1366 | return 0; | |
1367 | } | |
1368 | ||
6afcc775 | 1369 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1370 | { |
1371 | if (!cdev) | |
1372 | return; | |
1373 | ccw_device_set_timeout(cdev, 0); | |
1374 | cdev->private->flags.fake_irb = 0; | |
1375 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1376 | if (cdev->online) | |
1377 | ccw_device_schedule_recovery(); | |
1378 | } | |
1379 | ||
91c36919 PO |
1380 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1381 | { | |
1382 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1383 | ||
1384 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1385 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1386 | ccw_device_set_timeout(cdev, 0); |
1387 | cio_disable_subchannel(sch); | |
1388 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1389 | } | |
1390 | ||
5d6e6b6f PO |
1391 | enum io_sch_action { |
1392 | IO_SCH_UNREG, | |
1393 | IO_SCH_ORPH_UNREG, | |
1394 | IO_SCH_ATTACH, | |
1395 | IO_SCH_UNREG_ATTACH, | |
1396 | IO_SCH_ORPH_ATTACH, | |
1397 | IO_SCH_REPROBE, | |
1398 | IO_SCH_VERIFY, | |
1399 | IO_SCH_DISC, | |
1400 | IO_SCH_NOP, | |
1401 | }; | |
1402 | ||
1403 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1404 | { | |
1405 | struct ccw_device *cdev; | |
1406 | ||
1407 | cdev = sch_get_cdev(sch); | |
1408 | if (cio_update_schib(sch)) { | |
1409 | /* Not operational. */ | |
1410 | if (!cdev) | |
1411 | return IO_SCH_UNREG; | |
76e6fb4b | 1412 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1413 | return IO_SCH_UNREG; |
1414 | return IO_SCH_ORPH_UNREG; | |
1415 | } | |
1416 | /* Operational. */ | |
1417 | if (!cdev) | |
1418 | return IO_SCH_ATTACH; | |
1419 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
76e6fb4b | 1420 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1421 | return IO_SCH_UNREG_ATTACH; |
1422 | return IO_SCH_ORPH_ATTACH; | |
1423 | } | |
1424 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
76e6fb4b | 1425 | if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) |
5d6e6b6f PO |
1426 | return IO_SCH_UNREG; |
1427 | return IO_SCH_DISC; | |
1428 | } | |
1429 | if (device_is_disconnected(cdev)) | |
1430 | return IO_SCH_REPROBE; | |
31370f75 | 1431 | if (cdev->online && !cdev->private->flags.resuming) |
5d6e6b6f | 1432 | return IO_SCH_VERIFY; |
43d0be75 SO |
1433 | if (cdev->private->state == DEV_STATE_NOT_OPER) |
1434 | return IO_SCH_UNREG_ATTACH; | |
5d6e6b6f PO |
1435 | return IO_SCH_NOP; |
1436 | } | |
1437 | ||
1438 | /** | |
1439 | * io_subchannel_sch_event - process subchannel event | |
1440 | * @sch: subchannel | |
1441 | * @process: non-zero if function is called in process context | |
1442 | * | |
1443 | * An unspecified event occurred for this subchannel. Adjust data according | |
1444 | * to the current operational state of the subchannel and device. Return | |
1445 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1446 | * function should be called again in process context. | |
1447 | */ | |
1448 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1449 | { |
c820de39 | 1450 | unsigned long flags; |
c820de39 | 1451 | struct ccw_device *cdev; |
5d6e6b6f PO |
1452 | struct ccw_dev_id dev_id; |
1453 | enum io_sch_action action; | |
1454 | int rc = -EAGAIN; | |
c820de39 CH |
1455 | |
1456 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1457 | if (!device_is_registered(&sch->dev)) |
1458 | goto out_unlock; | |
390935ac PO |
1459 | if (work_pending(&sch->todo_work)) |
1460 | goto out_unlock; | |
37de53bb PO |
1461 | cdev = sch_get_cdev(sch); |
1462 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1463 | goto out_unlock; | |
5d6e6b6f PO |
1464 | action = sch_get_action(sch); |
1465 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1466 | sch->schid.ssid, sch->schid.sch_no, process, | |
1467 | action); | |
1468 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1469 | switch (action) { |
1470 | case IO_SCH_REPROBE: | |
1471 | /* Trigger device recognition. */ | |
1472 | ccw_device_trigger_reprobe(cdev); | |
1473 | rc = 0; | |
1474 | goto out_unlock; | |
1475 | case IO_SCH_VERIFY: | |
1476 | /* Trigger path verification. */ | |
1477 | io_subchannel_verify(sch); | |
1478 | rc = 0; | |
1479 | goto out_unlock; | |
1480 | case IO_SCH_DISC: | |
1481 | ccw_device_set_disconnected(cdev); | |
1482 | rc = 0; | |
1483 | goto out_unlock; | |
1484 | case IO_SCH_ORPH_UNREG: | |
1485 | case IO_SCH_ORPH_ATTACH: | |
1486 | ccw_device_set_disconnected(cdev); | |
1487 | break; | |
1488 | case IO_SCH_UNREG_ATTACH: | |
1489 | case IO_SCH_UNREG: | |
16d2ce27 SO |
1490 | if (!cdev) |
1491 | break; | |
1492 | if (cdev->private->state == DEV_STATE_SENSE_ID) { | |
1493 | /* | |
1494 | * Note: delayed work triggered by this event | |
1495 | * and repeated calls to sch_event are synchronized | |
1496 | * by the above check for work_pending(cdev). | |
1497 | */ | |
1498 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1499 | } else | |
5d6e6b6f PO |
1500 | ccw_device_set_notoper(cdev); |
1501 | break; | |
1502 | case IO_SCH_NOP: | |
1503 | rc = 0; | |
1504 | goto out_unlock; | |
1505 | default: | |
1506 | break; | |
c820de39 | 1507 | } |
5d6e6b6f PO |
1508 | spin_unlock_irqrestore(sch->lock, flags); |
1509 | /* All other actions require process context. */ | |
1510 | if (!process) | |
1511 | goto out; | |
1512 | /* Handle attached ccw device. */ | |
1513 | switch (action) { | |
1514 | case IO_SCH_ORPH_UNREG: | |
1515 | case IO_SCH_ORPH_ATTACH: | |
1516 | /* Move ccw device to orphanage. */ | |
1517 | rc = ccw_device_move_to_orph(cdev); | |
1518 | if (rc) | |
1519 | goto out; | |
c820de39 | 1520 | break; |
5d6e6b6f | 1521 | case IO_SCH_UNREG_ATTACH: |
3368ba25 | 1522 | spin_lock_irqsave(sch->lock, flags); |
74b6127e SO |
1523 | if (cdev->private->flags.resuming) { |
1524 | /* Device will be handled later. */ | |
1525 | rc = 0; | |
3368ba25 | 1526 | goto out_unlock; |
74b6127e | 1527 | } |
3368ba25 SO |
1528 | sch_set_cdev(sch, NULL); |
1529 | spin_unlock_irqrestore(sch->lock, flags); | |
5d6e6b6f | 1530 | /* Unregister ccw device. */ |
74b6127e | 1531 | ccw_device_unregister(cdev); |
c820de39 | 1532 | break; |
5d6e6b6f | 1533 | default: |
c820de39 CH |
1534 | break; |
1535 | } | |
5d6e6b6f | 1536 | /* Handle subchannel. */ |
c820de39 | 1537 | switch (action) { |
5d6e6b6f PO |
1538 | case IO_SCH_ORPH_UNREG: |
1539 | case IO_SCH_UNREG: | |
0d01bb89 SO |
1540 | if (!cdev || !cdev->private->flags.resuming) |
1541 | css_sch_device_unregister(sch); | |
c820de39 | 1542 | break; |
5d6e6b6f PO |
1543 | case IO_SCH_ORPH_ATTACH: |
1544 | case IO_SCH_UNREG_ATTACH: | |
1545 | case IO_SCH_ATTACH: | |
1546 | dev_id.ssid = sch->schid.ssid; | |
1547 | dev_id.devno = sch->schib.pmcw.dev; | |
1548 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1549 | if (!cdev) { | |
1550 | sch_create_and_recog_new_device(sch); | |
1551 | break; | |
1552 | } | |
1553 | rc = ccw_device_move_to_sch(cdev, sch); | |
1554 | if (rc) { | |
1555 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1556 | put_device(&cdev->dev); | |
1557 | goto out; | |
1558 | } | |
1559 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1560 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1561 | spin_unlock_irqrestore(sch->lock, flags); |
1562 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1563 | put_device(&cdev->dev); | |
91c36919 | 1564 | break; |
c820de39 CH |
1565 | default: |
1566 | break; | |
1567 | } | |
5d6e6b6f | 1568 | return 0; |
c820de39 | 1569 | |
5d6e6b6f PO |
1570 | out_unlock: |
1571 | spin_unlock_irqrestore(sch->lock, flags); | |
1572 | out: | |
1573 | return rc; | |
c820de39 CH |
1574 | } |
1575 | ||
1da177e4 | 1576 | #ifdef CONFIG_CCW_CONSOLE |
0ae7a7b2 CH |
1577 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1578 | struct subchannel *sch) | |
1da177e4 LT |
1579 | { |
1580 | int rc; | |
1581 | ||
0ae7a7b2 | 1582 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1583 | rc = cio_commit_config(sch); |
1584 | if (rc) | |
1585 | return rc; | |
0ae7a7b2 | 1586 | sch->driver = &io_subchannel_driver; |
ffa8d2a3 | 1587 | sch_set_cdev(sch, cdev); |
736b5db8 | 1588 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1589 | /* Now wait for the async. recognition to come to an end. */ |
1590 | spin_lock_irq(cdev->ccwlock); | |
1591 | while (!dev_fsm_final_state(cdev)) | |
188561a4 SO |
1592 | ccw_device_wait_idle(cdev); |
1593 | ||
afdfed0f SO |
1594 | /* Hold on to an extra reference while device is online. */ |
1595 | get_device(&cdev->dev); | |
1596 | rc = ccw_device_online(cdev); | |
1597 | if (rc) | |
1da177e4 | 1598 | goto out_unlock; |
afdfed0f | 1599 | |
1da177e4 | 1600 | while (!dev_fsm_final_state(cdev)) |
188561a4 SO |
1601 | ccw_device_wait_idle(cdev); |
1602 | ||
afdfed0f SO |
1603 | if (cdev->private->state == DEV_STATE_ONLINE) |
1604 | cdev->online = 1; | |
1605 | else | |
1606 | rc = -EIO; | |
1da177e4 LT |
1607 | out_unlock: |
1608 | spin_unlock_irq(cdev->ccwlock); | |
afdfed0f SO |
1609 | if (rc) /* Give up online reference since onlining failed. */ |
1610 | put_device(&cdev->dev); | |
736b5db8 | 1611 | return rc; |
1da177e4 LT |
1612 | } |
1613 | ||
afdfed0f | 1614 | struct ccw_device *ccw_device_probe_console(void) |
1da177e4 | 1615 | { |
863fc849 | 1616 | struct io_subchannel_private *io_priv; |
afdfed0f | 1617 | struct ccw_device *cdev; |
1da177e4 LT |
1618 | struct subchannel *sch; |
1619 | int ret; | |
1620 | ||
1da177e4 | 1621 | sch = cio_probe_console(); |
afdfed0f SO |
1622 | if (IS_ERR(sch)) |
1623 | return ERR_CAST(sch); | |
863fc849 SO |
1624 | |
1625 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); | |
1626 | if (!io_priv) { | |
1627 | put_device(&sch->dev); | |
1628 | return ERR_PTR(-ENOMEM); | |
1629 | } | |
afdfed0f SO |
1630 | cdev = io_subchannel_create_ccwdev(sch); |
1631 | if (IS_ERR(cdev)) { | |
1632 | put_device(&sch->dev); | |
1633 | kfree(io_priv); | |
1634 | return cdev; | |
1635 | } | |
863fc849 | 1636 | set_io_private(sch, io_priv); |
afdfed0f | 1637 | ret = ccw_device_console_enable(cdev, sch); |
1da177e4 | 1638 | if (ret) { |
863fc849 SO |
1639 | set_io_private(sch, NULL); |
1640 | put_device(&sch->dev); | |
afdfed0f | 1641 | put_device(&cdev->dev); |
863fc849 | 1642 | kfree(io_priv); |
1da177e4 LT |
1643 | return ERR_PTR(ret); |
1644 | } | |
afdfed0f | 1645 | return cdev; |
1da177e4 | 1646 | } |
1f4e7eda | 1647 | |
188561a4 SO |
1648 | /** |
1649 | * ccw_device_wait_idle() - busy wait for device to become idle | |
1650 | * @cdev: ccw device | |
1651 | * | |
1652 | * Poll until activity control is zero, that is, no function or data | |
1653 | * transfer is pending/active. | |
1654 | * Called with device lock being held. | |
1655 | */ | |
1656 | void ccw_device_wait_idle(struct ccw_device *cdev) | |
1657 | { | |
1658 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1659 | ||
1660 | while (1) { | |
1661 | cio_tsch(sch); | |
1662 | if (sch->schib.scsw.cmd.actl == 0) | |
1663 | break; | |
1664 | udelay_simple(100); | |
1665 | } | |
1666 | } | |
1667 | ||
6664845c MS |
1668 | static int ccw_device_pm_restore(struct device *dev); |
1669 | ||
f10ccca7 | 1670 | int ccw_device_force_console(struct ccw_device *cdev) |
6664845c | 1671 | { |
f10ccca7 | 1672 | return ccw_device_pm_restore(&cdev->dev); |
6664845c MS |
1673 | } |
1674 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1675 | #endif |
1676 | ||
1677 | /* | |
1678 | * get ccw_device matching the busid, but only if owned by cdrv | |
1679 | */ | |
b0744bd2 CH |
1680 | static int |
1681 | __ccwdev_check_busid(struct device *dev, void *id) | |
1682 | { | |
1683 | char *bus_id; | |
1684 | ||
12975aef | 1685 | bus_id = id; |
b0744bd2 | 1686 | |
98df67b3 | 1687 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1688 | } |
1689 | ||
1690 | ||
b2ffd8e9 CH |
1691 | /** |
1692 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1693 | * @cdrv: driver the device is owned by | |
1694 | * @bus_id: bus id of the device to be searched | |
1695 | * | |
1696 | * This function searches all devices owned by @cdrv for a device with a bus | |
1697 | * id matching @bus_id. | |
1698 | * Returns: | |
1699 | * If a match is found, its reference count of the found device is increased | |
1700 | * and it is returned; else %NULL is returned. | |
1701 | */ | |
1702 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1703 | const char *bus_id) | |
1da177e4 | 1704 | { |
b0744bd2 | 1705 | struct device *dev; |
1da177e4 | 1706 | |
9f30ea95 | 1707 | dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id, |
b0744bd2 | 1708 | __ccwdev_check_busid); |
1da177e4 | 1709 | |
d2c993d8 | 1710 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1711 | } |
1712 | ||
1713 | /************************** device driver handling ************************/ | |
1714 | ||
1715 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1716 | * and release methods are initially very similar to the device_driver | |
1717 | * implementations, with the difference that they have ccw_device | |
1718 | * arguments. | |
1719 | * | |
1720 | * A ccw driver also contains the information that is needed for | |
1721 | * device matching. | |
1722 | */ | |
1723 | static int | |
1724 | ccw_device_probe (struct device *dev) | |
1725 | { | |
1726 | struct ccw_device *cdev = to_ccwdev(dev); | |
1727 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1728 | int ret; | |
1729 | ||
1730 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
de400d6b PO |
1731 | /* Note: we interpret class 0 in this context as an uninitialized |
1732 | * field since it translates to a non-I/O interrupt class. */ | |
1733 | if (cdrv->int_class != 0) | |
1734 | cdev->private->int_class = cdrv->int_class; | |
1735 | else | |
420f42ec | 1736 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1737 | |
1738 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1739 | ||
1740 | if (ret) { | |
d2c993d8 | 1741 | cdev->drv = NULL; |
420f42ec | 1742 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1743 | return ret; |
1744 | } | |
1745 | ||
1746 | return 0; | |
1747 | } | |
1748 | ||
1749 | static int | |
1750 | ccw_device_remove (struct device *dev) | |
1751 | { | |
1752 | struct ccw_device *cdev = to_ccwdev(dev); | |
1753 | struct ccw_driver *cdrv = cdev->drv; | |
1754 | int ret; | |
1755 | ||
1da177e4 LT |
1756 | if (cdrv->remove) |
1757 | cdrv->remove(cdev); | |
1758 | if (cdev->online) { | |
1759 | cdev->online = 0; | |
1760 | spin_lock_irq(cdev->ccwlock); | |
1761 | ret = ccw_device_offline(cdev); | |
1762 | spin_unlock_irq(cdev->ccwlock); | |
1763 | if (ret == 0) | |
1764 | wait_event(cdev->private->wait_q, | |
1765 | dev_fsm_final_state(cdev)); | |
1766 | else | |
139b83dd | 1767 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1768 | "device 0.%x.%04x\n", |
1769 | ret, cdev->private->dev_id.ssid, | |
1770 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1771 | /* Give up reference obtained in ccw_device_set_online(). */ |
1772 | put_device(&cdev->dev); | |
1da177e4 LT |
1773 | } |
1774 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1775 | cdev->drv = NULL; |
420f42ec | 1776 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1777 | return 0; |
1778 | } | |
1779 | ||
958974fb CH |
1780 | static void ccw_device_shutdown(struct device *dev) |
1781 | { | |
1782 | struct ccw_device *cdev; | |
1783 | ||
1784 | cdev = to_ccwdev(dev); | |
1785 | if (cdev->drv && cdev->drv->shutdown) | |
1786 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1787 | disable_cmf(cdev); |
958974fb CH |
1788 | } |
1789 | ||
823d494a SO |
1790 | static int ccw_device_pm_prepare(struct device *dev) |
1791 | { | |
1792 | struct ccw_device *cdev = to_ccwdev(dev); | |
1793 | ||
37de53bb | 1794 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1795 | return -EAGAIN; |
1796 | /* Fail while device is being set online/offline. */ | |
1797 | if (atomic_read(&cdev->private->onoff)) | |
1798 | return -EAGAIN; | |
1799 | ||
1800 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1801 | return cdev->drv->prepare(cdev); | |
1802 | ||
1803 | return 0; | |
1804 | } | |
1805 | ||
1806 | static void ccw_device_pm_complete(struct device *dev) | |
1807 | { | |
1808 | struct ccw_device *cdev = to_ccwdev(dev); | |
1809 | ||
1810 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1811 | cdev->drv->complete(cdev); | |
1812 | } | |
1813 | ||
1814 | static int ccw_device_pm_freeze(struct device *dev) | |
1815 | { | |
1816 | struct ccw_device *cdev = to_ccwdev(dev); | |
1817 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1818 | int ret, cm_enabled; | |
1819 | ||
1820 | /* Fail suspend while device is in transistional state. */ | |
1821 | if (!dev_fsm_final_state(cdev)) | |
1822 | return -EAGAIN; | |
1823 | if (!cdev->online) | |
1824 | return 0; | |
1825 | if (cdev->drv && cdev->drv->freeze) { | |
1826 | ret = cdev->drv->freeze(cdev); | |
1827 | if (ret) | |
1828 | return ret; | |
1829 | } | |
1830 | ||
1831 | spin_lock_irq(sch->lock); | |
1832 | cm_enabled = cdev->private->cmb != NULL; | |
1833 | spin_unlock_irq(sch->lock); | |
1834 | if (cm_enabled) { | |
1835 | /* Don't have the css write on memory. */ | |
1836 | ret = ccw_set_cmf(cdev, 0); | |
1837 | if (ret) | |
1838 | return ret; | |
1839 | } | |
1840 | /* From here on, disallow device driver I/O. */ | |
1841 | spin_lock_irq(sch->lock); | |
1842 | ret = cio_disable_subchannel(sch); | |
1843 | spin_unlock_irq(sch->lock); | |
1844 | ||
1845 | return ret; | |
1846 | } | |
1847 | ||
1848 | static int ccw_device_pm_thaw(struct device *dev) | |
1849 | { | |
1850 | struct ccw_device *cdev = to_ccwdev(dev); | |
1851 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1852 | int ret, cm_enabled; | |
1853 | ||
1854 | if (!cdev->online) | |
1855 | return 0; | |
1856 | ||
1857 | spin_lock_irq(sch->lock); | |
1858 | /* Allow device driver I/O again. */ | |
1859 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1860 | cm_enabled = cdev->private->cmb != NULL; | |
1861 | spin_unlock_irq(sch->lock); | |
1862 | if (ret) | |
1863 | return ret; | |
1864 | ||
1865 | if (cm_enabled) { | |
1866 | ret = ccw_set_cmf(cdev, 1); | |
1867 | if (ret) | |
1868 | return ret; | |
1869 | } | |
1870 | ||
1871 | if (cdev->drv && cdev->drv->thaw) | |
1872 | ret = cdev->drv->thaw(cdev); | |
1873 | ||
1874 | return ret; | |
1875 | } | |
1876 | ||
1877 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1878 | { | |
1879 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a | 1880 | |
0d01bb89 SO |
1881 | spin_lock_irq(sch->lock); |
1882 | if (cio_is_console(sch->schid)) { | |
1883 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1884 | goto out_unlock; | |
1885 | } | |
823d494a SO |
1886 | /* |
1887 | * While we were sleeping, devices may have gone or become | |
1888 | * available again. Kick re-detection. | |
1889 | */ | |
823d494a | 1890 | cdev->private->flags.resuming = 1; |
b17295e6 | 1891 | cdev->private->path_new_mask = LPM_ANYPATH; |
817e5000 | 1892 | css_sched_sch_todo(sch, SCH_TODO_EVAL); |
0d01bb89 | 1893 | spin_unlock_irq(sch->lock); |
817e5000 | 1894 | css_wait_for_slow_path(); |
0d01bb89 SO |
1895 | |
1896 | /* cdev may have been moved to a different subchannel. */ | |
1897 | sch = to_subchannel(cdev->dev.parent); | |
1898 | spin_lock_irq(sch->lock); | |
1899 | if (cdev->private->state != DEV_STATE_ONLINE && | |
1900 | cdev->private->state != DEV_STATE_OFFLINE) | |
1901 | goto out_unlock; | |
1902 | ||
736b5db8 | 1903 | ccw_device_recognition(cdev); |
823d494a | 1904 | spin_unlock_irq(sch->lock); |
823d494a SO |
1905 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1906 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
0d01bb89 SO |
1907 | spin_lock_irq(sch->lock); |
1908 | ||
1909 | out_unlock: | |
823d494a | 1910 | cdev->private->flags.resuming = 0; |
0d01bb89 | 1911 | spin_unlock_irq(sch->lock); |
823d494a SO |
1912 | } |
1913 | ||
1914 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1915 | { | |
1916 | cdev->private->state = DEV_STATE_BOXED; | |
76e6fb4b | 1917 | if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK) |
823d494a | 1918 | return 0; |
37de53bb | 1919 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1920 | return -ENODEV; |
1921 | } | |
1922 | ||
1923 | static int resume_handle_disc(struct ccw_device *cdev) | |
1924 | { | |
1925 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
76e6fb4b | 1926 | if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK) |
823d494a | 1927 | return 0; |
37de53bb | 1928 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1929 | return -ENODEV; |
1930 | } | |
1931 | ||
1932 | static int ccw_device_pm_restore(struct device *dev) | |
1933 | { | |
1934 | struct ccw_device *cdev = to_ccwdev(dev); | |
0d01bb89 SO |
1935 | struct subchannel *sch; |
1936 | int ret = 0; | |
823d494a SO |
1937 | |
1938 | __ccw_device_pm_restore(cdev); | |
0d01bb89 | 1939 | sch = to_subchannel(cdev->dev.parent); |
823d494a | 1940 | spin_lock_irq(sch->lock); |
0d01bb89 | 1941 | if (cio_is_console(sch->schid)) |
823d494a | 1942 | goto out_restore; |
0d01bb89 | 1943 | |
823d494a SO |
1944 | /* check recognition results */ |
1945 | switch (cdev->private->state) { | |
1946 | case DEV_STATE_OFFLINE: | |
0d01bb89 SO |
1947 | case DEV_STATE_ONLINE: |
1948 | cdev->private->flags.donotify = 0; | |
823d494a SO |
1949 | break; |
1950 | case DEV_STATE_BOXED: | |
1951 | ret = resume_handle_boxed(cdev); | |
823d494a | 1952 | if (ret) |
0d01bb89 | 1953 | goto out_unlock; |
823d494a | 1954 | goto out_restore; |
823d494a | 1955 | default: |
0d01bb89 SO |
1956 | ret = resume_handle_disc(cdev); |
1957 | if (ret) | |
1958 | goto out_unlock; | |
1959 | goto out_restore; | |
823d494a SO |
1960 | } |
1961 | /* check if the device type has changed */ | |
1962 | if (!ccw_device_test_sense_data(cdev)) { | |
1963 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1964 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1965 | ret = -ENODEV; |
1966 | goto out_unlock; | |
1967 | } | |
0d01bb89 | 1968 | if (!cdev->online) |
823d494a | 1969 | goto out_unlock; |
823d494a | 1970 | |
0d01bb89 SO |
1971 | if (ccw_device_online(cdev)) { |
1972 | ret = resume_handle_disc(cdev); | |
1973 | if (ret) | |
1974 | goto out_unlock; | |
1975 | goto out_restore; | |
1976 | } | |
823d494a | 1977 | spin_unlock_irq(sch->lock); |
823d494a | 1978 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
0d01bb89 SO |
1979 | spin_lock_irq(sch->lock); |
1980 | ||
1981 | if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) { | |
1982 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1983 | ret = -ENODEV; | |
1984 | goto out_unlock; | |
823d494a | 1985 | } |
0d01bb89 SO |
1986 | |
1987 | /* reenable cmf, if needed */ | |
1988 | if (cdev->private->cmb) { | |
1989 | spin_unlock_irq(sch->lock); | |
823d494a | 1990 | ret = ccw_set_cmf(cdev, 1); |
0d01bb89 | 1991 | spin_lock_irq(sch->lock); |
823d494a | 1992 | if (ret) { |
f014824e SO |
1993 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1994 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1995 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1996 | ret = 0; |
1997 | } | |
1998 | } | |
1999 | ||
2000 | out_restore: | |
0d01bb89 | 2001 | spin_unlock_irq(sch->lock); |
823d494a SO |
2002 | if (cdev->online && cdev->drv && cdev->drv->restore) |
2003 | ret = cdev->drv->restore(cdev); | |
823d494a SO |
2004 | return ret; |
2005 | ||
823d494a SO |
2006 | out_unlock: |
2007 | spin_unlock_irq(sch->lock); | |
2008 | return ret; | |
2009 | } | |
2010 | ||
47145210 | 2011 | static const struct dev_pm_ops ccw_pm_ops = { |
823d494a SO |
2012 | .prepare = ccw_device_pm_prepare, |
2013 | .complete = ccw_device_pm_complete, | |
2014 | .freeze = ccw_device_pm_freeze, | |
2015 | .thaw = ccw_device_pm_thaw, | |
2016 | .restore = ccw_device_pm_restore, | |
2017 | }; | |
2018 | ||
d5ab5276 | 2019 | static struct bus_type ccw_bus_type = { |
8bbace7e CH |
2020 | .name = "ccw", |
2021 | .match = ccw_bus_match, | |
2022 | .uevent = ccw_uevent, | |
2023 | .probe = ccw_device_probe, | |
2024 | .remove = ccw_device_remove, | |
958974fb | 2025 | .shutdown = ccw_device_shutdown, |
823d494a | 2026 | .pm = &ccw_pm_ops, |
8bbace7e CH |
2027 | }; |
2028 | ||
b2ffd8e9 CH |
2029 | /** |
2030 | * ccw_driver_register() - register a ccw driver | |
2031 | * @cdriver: driver to be registered | |
2032 | * | |
2033 | * This function is mainly a wrapper around driver_register(). | |
2034 | * Returns: | |
2035 | * %0 on success and a negative error value on failure. | |
2036 | */ | |
2037 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2038 | { |
2039 | struct device_driver *drv = &cdriver->driver; | |
2040 | ||
2041 | drv->bus = &ccw_bus_type; | |
1da177e4 LT |
2042 | |
2043 | return driver_register(drv); | |
2044 | } | |
2045 | ||
b2ffd8e9 CH |
2046 | /** |
2047 | * ccw_driver_unregister() - deregister a ccw driver | |
2048 | * @cdriver: driver to be deregistered | |
2049 | * | |
2050 | * This function is mainly a wrapper around driver_unregister(). | |
2051 | */ | |
2052 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2053 | { |
2054 | driver_unregister(&cdriver->driver); | |
2055 | } | |
2056 | ||
37de53bb PO |
2057 | static void ccw_device_todo(struct work_struct *work) |
2058 | { | |
2059 | struct ccw_device_private *priv; | |
2060 | struct ccw_device *cdev; | |
2061 | struct subchannel *sch; | |
2062 | enum cdev_todo todo; | |
2063 | ||
2064 | priv = container_of(work, struct ccw_device_private, todo_work); | |
2065 | cdev = priv->cdev; | |
2066 | sch = to_subchannel(cdev->dev.parent); | |
2067 | /* Find out todo. */ | |
2068 | spin_lock_irq(cdev->ccwlock); | |
2069 | todo = priv->todo; | |
2070 | priv->todo = CDEV_TODO_NOTHING; | |
2071 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
2072 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
2073 | spin_unlock_irq(cdev->ccwlock); | |
2074 | /* Perform todo. */ | |
2075 | switch (todo) { | |
2076 | case CDEV_TODO_ENABLE_CMF: | |
2077 | cmf_reenable(cdev); | |
2078 | break; | |
2079 | case CDEV_TODO_REBIND: | |
2080 | ccw_device_do_unbind_bind(cdev); | |
2081 | break; | |
2082 | case CDEV_TODO_REGISTER: | |
2083 | io_subchannel_register(cdev); | |
2084 | break; | |
2085 | case CDEV_TODO_UNREG_EVAL: | |
2086 | if (!sch_is_pseudo_sch(sch)) | |
2087 | css_schedule_eval(sch->schid); | |
2088 | /* fall-through */ | |
2089 | case CDEV_TODO_UNREG: | |
2090 | if (sch_is_pseudo_sch(sch)) | |
2091 | ccw_device_unregister(cdev); | |
2092 | else | |
2093 | ccw_device_call_sch_unregister(cdev); | |
2094 | break; | |
2095 | default: | |
2096 | break; | |
2097 | } | |
2098 | /* Release workqueue ref. */ | |
2099 | put_device(&cdev->dev); | |
2100 | } | |
2101 | ||
2102 | /** | |
2103 | * ccw_device_sched_todo - schedule ccw device operation | |
2104 | * @cdev: ccw device | |
2105 | * @todo: todo | |
2106 | * | |
2107 | * Schedule the operation identified by @todo to be performed on the slow path | |
2108 | * workqueue. Do nothing if another operation with higher priority is already | |
2109 | * scheduled. Needs to be called with ccwdev lock held. | |
2110 | */ | |
2111 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2112 | { | |
2113 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2114 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2115 | todo); | |
2116 | if (cdev->private->todo >= todo) | |
2117 | return; | |
2118 | cdev->private->todo = todo; | |
2119 | /* Get workqueue ref. */ | |
2120 | if (!get_device(&cdev->dev)) | |
2121 | return; | |
be5d3823 | 2122 | if (!queue_work(cio_work_q, &cdev->private->todo_work)) { |
37de53bb PO |
2123 | /* Already queued, release workqueue ref. */ |
2124 | put_device(&cdev->dev); | |
2125 | } | |
2126 | } | |
2127 | ||
fd0457a6 ME |
2128 | /** |
2129 | * ccw_device_siosl() - initiate logging | |
2130 | * @cdev: ccw device | |
2131 | * | |
2132 | * This function is used to invoke model-dependent logging within the channel | |
2133 | * subsystem. | |
2134 | */ | |
2135 | int ccw_device_siosl(struct ccw_device *cdev) | |
2136 | { | |
2137 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2138 | ||
2139 | return chsc_siosl(sch->schid); | |
2140 | } | |
2141 | EXPORT_SYMBOL_GPL(ccw_device_siosl); | |
2142 | ||
1da177e4 LT |
2143 | MODULE_LICENSE("GPL"); |
2144 | EXPORT_SYMBOL(ccw_device_set_online); | |
2145 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2146 | EXPORT_SYMBOL(ccw_driver_register); | |
2147 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2148 | EXPORT_SYMBOL(get_ccwdev_by_busid); |