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 | ||
0ad8f714 SO |
47 | static atomic_t ccw_device_init_count = ATOMIC_INIT(0); |
48 | static DECLARE_WAIT_QUEUE_HEAD(ccw_device_init_wq); | |
49 | static struct bus_type ccw_bus_type; | |
50 | ||
1da177e4 LT |
51 | /******************* bus type handling ***********************/ |
52 | ||
53 | /* The Linux driver model distinguishes between a bus type and | |
54 | * the bus itself. Of course we only have one channel | |
55 | * subsystem driver and one channel system per machine, but | |
56 | * we still use the abstraction. T.R. says it's a good idea. */ | |
57 | static int | |
58 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
59 | { | |
60 | struct ccw_device *cdev = to_ccwdev(dev); | |
61 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
62 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
63 | ||
64 | if (!ids) | |
65 | return 0; | |
66 | ||
67 | found = ccw_device_id_match(ids, &cdev->id); | |
68 | if (!found) | |
69 | return 0; | |
70 | ||
71 | cdev->id.driver_info = found->driver_info; | |
72 | ||
73 | return 1; | |
74 | } | |
75 | ||
db0c2d59 PO |
76 | /* Store modalias string delimited by prefix/suffix string into buffer with |
77 | * specified size. Return length of resulting string (excluding trailing '\0') | |
78 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 79 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 80 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 81 | { |
db0c2d59 | 82 | int len; |
1da177e4 | 83 | |
cfbe9bb2 | 84 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
85 | if (len > size) |
86 | return len; | |
87 | buf += len; | |
88 | size -= len; | |
1da177e4 | 89 | |
db0c2d59 PO |
90 | if (id->dev_type != 0) |
91 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
92 | id->dev_model, suffix); | |
93 | else | |
94 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 95 | |
db0c2d59 PO |
96 | return len; |
97 | } | |
98 | ||
99 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
100 | * non-zero otherwise. */ | |
7eff2e7a | 101 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
102 | { |
103 | struct ccw_device *cdev = to_ccwdev(dev); | |
104 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
105 | int ret; |
106 | char modalias_buf[30]; | |
1da177e4 | 107 | |
db0c2d59 | 108 | /* CU_TYPE= */ |
7eff2e7a | 109 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
110 | if (ret) |
111 | return ret; | |
db0c2d59 PO |
112 | |
113 | /* CU_MODEL= */ | |
7eff2e7a | 114 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
115 | if (ret) |
116 | return ret; | |
1da177e4 LT |
117 | |
118 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 119 | /* DEV_TYPE= */ |
7eff2e7a | 120 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
121 | if (ret) |
122 | return ret; | |
1da177e4 | 123 | |
db0c2d59 | 124 | /* DEV_MODEL= */ |
7eff2e7a | 125 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
126 | if (ret) |
127 | return ret; | |
db0c2d59 PO |
128 | |
129 | /* MODALIAS= */ | |
cfbe9bb2 | 130 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
131 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
132 | return ret; | |
1da177e4 LT |
133 | } |
134 | ||
602b20f2 CH |
135 | static void io_subchannel_irq(struct subchannel *); |
136 | static int io_subchannel_probe(struct subchannel *); | |
137 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 138 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 139 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
140 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
141 | int); | |
8ea7f559 | 142 | static void recovery_func(unsigned long data); |
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 | ||
90ab1336 | 195 | setup_timer(&recovery_timer, recovery_func, 0); |
be5d3823 SO |
196 | ret = bus_register(&ccw_bus_type); |
197 | if (ret) | |
198 | return ret; | |
25b7bb58 CH |
199 | ret = css_driver_register(&io_subchannel_driver); |
200 | if (ret) | |
be5d3823 | 201 | bus_unregister(&ccw_bus_type); |
1da177e4 | 202 | |
1da177e4 LT |
203 | return ret; |
204 | } | |
205 | ||
1da177e4 LT |
206 | |
207 | /************************ device handling **************************/ | |
208 | ||
209 | /* | |
210 | * A ccw_device has some interfaces in sysfs in addition to the | |
211 | * standard ones. | |
212 | * The following entries are designed to export the information which | |
213 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
214 | * are obvious, so they don't have an entry :) | |
215 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
216 | */ | |
217 | static ssize_t | |
3fd3c0a5 | 218 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
219 | { |
220 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 221 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
222 | ssize_t ret = 0; |
223 | int chp; | |
7ad6a249 PO |
224 | int mask; |
225 | ||
226 | for (chp = 0; chp < 8; chp++) { | |
227 | mask = 0x80 >> chp; | |
228 | if (ssd->path_mask & mask) | |
229 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
230 | else | |
231 | ret += sprintf(buf + ret, "00 "); | |
232 | } | |
1da177e4 LT |
233 | ret += sprintf (buf+ret, "\n"); |
234 | return min((ssize_t)PAGE_SIZE, ret); | |
235 | } | |
236 | ||
237 | static ssize_t | |
3fd3c0a5 | 238 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
239 | { |
240 | struct subchannel *sch = to_subchannel(dev); | |
241 | struct pmcw *pmcw = &sch->schib.pmcw; | |
242 | ||
243 | return sprintf (buf, "%02x %02x %02x\n", | |
244 | pmcw->pim, pmcw->pam, pmcw->pom); | |
245 | } | |
246 | ||
247 | static ssize_t | |
3fd3c0a5 | 248 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
249 | { |
250 | struct ccw_device *cdev = to_ccwdev(dev); | |
251 | struct ccw_device_id *id = &(cdev->id); | |
252 | ||
253 | if (id->dev_type != 0) | |
254 | return sprintf(buf, "%04x/%02x\n", | |
255 | id->dev_type, id->dev_model); | |
256 | else | |
257 | return sprintf(buf, "n/a\n"); | |
258 | } | |
259 | ||
260 | static ssize_t | |
3fd3c0a5 | 261 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
262 | { |
263 | struct ccw_device *cdev = to_ccwdev(dev); | |
264 | struct ccw_device_id *id = &(cdev->id); | |
265 | ||
266 | return sprintf(buf, "%04x/%02x\n", | |
267 | id->cu_type, id->cu_model); | |
268 | } | |
269 | ||
f1fc78a8 BB |
270 | static ssize_t |
271 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
272 | { | |
273 | struct ccw_device *cdev = to_ccwdev(dev); | |
274 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 275 | int len; |
f1fc78a8 | 276 | |
086a6c62 | 277 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
278 | |
279 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
280 | } |
281 | ||
1da177e4 | 282 | static ssize_t |
3fd3c0a5 | 283 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
284 | { |
285 | struct ccw_device *cdev = to_ccwdev(dev); | |
286 | ||
287 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
288 | } | |
289 | ||
d7b5a4c9 CH |
290 | int ccw_device_is_orphan(struct ccw_device *cdev) |
291 | { | |
292 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
293 | } | |
294 | ||
ef99516c | 295 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 296 | { |
7d253b9a | 297 | if (device_is_registered(&cdev->dev)) { |
24a1872d | 298 | /* Undo device_add(). */ |
ef99516c | 299 | device_del(&cdev->dev); |
24a1872d SO |
300 | } |
301 | if (cdev->private->flags.initialized) { | |
302 | cdev->private->flags.initialized = 0; | |
3b554a14 SO |
303 | /* Release reference from device_initialize(). */ |
304 | put_device(&cdev->dev); | |
305 | } | |
7674da77 CH |
306 | } |
307 | ||
d40f7b75 SO |
308 | static void io_subchannel_quiesce(struct subchannel *); |
309 | ||
b2ffd8e9 CH |
310 | /** |
311 | * ccw_device_set_offline() - disable a ccw device for I/O | |
312 | * @cdev: target ccw device | |
313 | * | |
314 | * This function calls the driver's set_offline() function for @cdev, if | |
315 | * given, and then disables @cdev. | |
316 | * Returns: | |
317 | * %0 on success and a negative error value on failure. | |
318 | * Context: | |
319 | * enabled, ccw device lock not held | |
320 | */ | |
321 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 | 322 | { |
d40f7b75 SO |
323 | struct subchannel *sch; |
324 | int ret, state; | |
1da177e4 LT |
325 | |
326 | if (!cdev) | |
327 | return -ENODEV; | |
328 | if (!cdev->online || !cdev->drv) | |
329 | return -EINVAL; | |
330 | ||
331 | if (cdev->drv->set_offline) { | |
332 | ret = cdev->drv->set_offline(cdev); | |
333 | if (ret != 0) | |
334 | return ret; | |
335 | } | |
336 | cdev->online = 0; | |
337 | spin_lock_irq(cdev->ccwlock); | |
d40f7b75 | 338 | sch = to_subchannel(cdev->dev.parent); |
217ee6c6 ME |
339 | /* Wait until a final state or DISCONNECTED is reached */ |
340 | while (!dev_fsm_final_state(cdev) && | |
341 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 342 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
343 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
344 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
345 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 346 | } |
d40f7b75 SO |
347 | do { |
348 | ret = ccw_device_offline(cdev); | |
349 | if (!ret) | |
350 | break; | |
351 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " | |
352 | "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, | |
353 | cdev->private->dev_id.devno); | |
354 | if (ret != -EBUSY) | |
355 | goto error; | |
356 | state = cdev->private->state; | |
357 | spin_unlock_irq(cdev->ccwlock); | |
358 | io_subchannel_quiesce(sch); | |
359 | spin_lock_irq(cdev->ccwlock); | |
360 | cdev->private->state = state; | |
361 | } while (ret == -EBUSY); | |
1da177e4 | 362 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
363 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
364 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
a7ae2c02 PO |
365 | /* Inform the user if set offline failed. */ |
366 | if (cdev->private->state == DEV_STATE_BOXED) { | |
367 | pr_warning("%s: The device entered boxed state while " | |
368 | "being set offline\n", dev_name(&cdev->dev)); | |
369 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
370 | pr_warning("%s: The device stopped operating while " | |
371 | "being set offline\n", dev_name(&cdev->dev)); | |
372 | } | |
217ee6c6 ME |
373 | /* Give up reference from ccw_device_set_online(). */ |
374 | put_device(&cdev->dev); | |
375 | return 0; | |
376 | ||
377 | error: | |
217ee6c6 ME |
378 | cdev->private->state = DEV_STATE_OFFLINE; |
379 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
380 | spin_unlock_irq(cdev->ccwlock); | |
381 | /* Give up reference from ccw_device_set_online(). */ | |
382 | put_device(&cdev->dev); | |
383 | return -ENODEV; | |
1da177e4 LT |
384 | } |
385 | ||
b2ffd8e9 CH |
386 | /** |
387 | * ccw_device_set_online() - enable a ccw device for I/O | |
388 | * @cdev: target ccw device | |
389 | * | |
390 | * This function first enables @cdev and then calls the driver's set_online() | |
391 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
392 | * disabled again. | |
393 | * Returns: | |
394 | * %0 on success and a negative error value on failure. | |
395 | * Context: | |
396 | * enabled, ccw device lock not held | |
397 | */ | |
398 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
399 | { |
400 | int ret; | |
217ee6c6 | 401 | int ret2; |
1da177e4 LT |
402 | |
403 | if (!cdev) | |
404 | return -ENODEV; | |
405 | if (cdev->online || !cdev->drv) | |
406 | return -EINVAL; | |
9cd67421 CH |
407 | /* Hold on to an extra reference while device is online. */ |
408 | if (!get_device(&cdev->dev)) | |
409 | return -ENODEV; | |
1da177e4 LT |
410 | |
411 | spin_lock_irq(cdev->ccwlock); | |
412 | ret = ccw_device_online(cdev); | |
413 | spin_unlock_irq(cdev->ccwlock); | |
414 | if (ret == 0) | |
415 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
416 | else { | |
139b83dd | 417 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
418 | "device 0.%x.%04x\n", |
419 | ret, cdev->private->dev_id.ssid, | |
420 | cdev->private->dev_id.devno); | |
9cd67421 CH |
421 | /* Give up online reference since onlining failed. */ |
422 | put_device(&cdev->dev); | |
1da177e4 LT |
423 | return ret; |
424 | } | |
217ee6c6 ME |
425 | spin_lock_irq(cdev->ccwlock); |
426 | /* Check if online processing was successful */ | |
427 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
428 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
429 | spin_unlock_irq(cdev->ccwlock); | |
a7ae2c02 PO |
430 | /* Inform the user that set online failed. */ |
431 | if (cdev->private->state == DEV_STATE_BOXED) { | |
432 | pr_warning("%s: Setting the device online failed " | |
433 | "because it is boxed\n", | |
434 | dev_name(&cdev->dev)); | |
435 | } else if (cdev->private->state == DEV_STATE_NOT_OPER) { | |
436 | pr_warning("%s: Setting the device online failed " | |
437 | "because it is not operational\n", | |
438 | dev_name(&cdev->dev)); | |
439 | } | |
9cd67421 CH |
440 | /* Give up online reference since onlining failed. */ |
441 | put_device(&cdev->dev); | |
1da177e4 | 442 | return -ENODEV; |
9cd67421 | 443 | } |
217ee6c6 ME |
444 | spin_unlock_irq(cdev->ccwlock); |
445 | if (cdev->drv->set_online) | |
446 | ret = cdev->drv->set_online(cdev); | |
447 | if (ret) | |
448 | goto rollback; | |
449 | cdev->online = 1; | |
450 | return 0; | |
451 | ||
452 | rollback: | |
1da177e4 | 453 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
454 | /* Wait until a final state or DISCONNECTED is reached */ |
455 | while (!dev_fsm_final_state(cdev) && | |
456 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
457 | spin_unlock_irq(cdev->ccwlock); | |
458 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
459 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
460 | spin_lock_irq(cdev->ccwlock); | |
461 | } | |
462 | ret2 = ccw_device_offline(cdev); | |
463 | if (ret2) | |
464 | goto error; | |
465 | spin_unlock_irq(cdev->ccwlock); | |
466 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
467 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
468 | /* Give up online reference since onlining failed. */ | |
469 | put_device(&cdev->dev); | |
470 | return ret; | |
471 | ||
472 | error: | |
473 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
474 | "device 0.%x.%04x\n", | |
475 | ret2, cdev->private->dev_id.ssid, | |
476 | cdev->private->dev_id.devno); | |
477 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 478 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
479 | /* Give up online reference since onlining failed. */ |
480 | put_device(&cdev->dev); | |
217ee6c6 | 481 | return ret; |
1da177e4 LT |
482 | } |
483 | ||
e74fe0ce | 484 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 485 | { |
37de53bb PO |
486 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
487 | spin_lock_irq(cdev->ccwlock); | |
488 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
489 | spin_unlock_irq(cdev->ccwlock); | |
7cd40314 SO |
490 | return 0; |
491 | } | |
492 | if (cdev->drv && cdev->drv->set_offline) | |
e74fe0ce | 493 | return ccw_device_set_offline(cdev); |
7cd40314 | 494 | return -EINVAL; |
f5ba6c86 CH |
495 | } |
496 | ||
497 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
498 | { | |
f5ba6c86 | 499 | /* Do device recognition, if needed. */ |
99f6a570 | 500 | if (cdev->private->state == DEV_STATE_BOXED) { |
1f5bd384 | 501 | spin_lock_irq(cdev->ccwlock); |
736b5db8 | 502 | ccw_device_recognition(cdev); |
1f5bd384 | 503 | spin_unlock_irq(cdev->ccwlock); |
f5ba6c86 CH |
504 | wait_event(cdev->private->wait_q, |
505 | cdev->private->flags.recog_done); | |
156013ff SO |
506 | if (cdev->private->state != DEV_STATE_OFFLINE) |
507 | /* recognition failed */ | |
508 | return -EAGAIN; | |
f5ba6c86 CH |
509 | } |
510 | if (cdev->drv && cdev->drv->set_online) | |
7cd40314 SO |
511 | return ccw_device_set_online(cdev); |
512 | return -EINVAL; | |
f5ba6c86 | 513 | } |
156013ff | 514 | |
c78aa6cb | 515 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
516 | { |
517 | int ret; | |
518 | ||
519 | ret = online_store_recog_and_online(cdev); | |
156013ff | 520 | if (ret && !force) |
c78aa6cb | 521 | return ret; |
f5ba6c86 CH |
522 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
523 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
524 | if (ret) |
525 | return ret; | |
f5ba6c86 CH |
526 | if (cdev->id.cu_type == 0) |
527 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
528 | ret = online_store_recog_and_online(cdev); |
529 | if (ret) | |
530 | return ret; | |
f5ba6c86 | 531 | } |
c78aa6cb | 532 | return 0; |
f5ba6c86 CH |
533 | } |
534 | ||
535 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
536 | const char *buf, size_t count) | |
1da177e4 LT |
537 | { |
538 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
539 | int force, ret; |
540 | unsigned long i; | |
1da177e4 | 541 | |
a2fc8485 | 542 | /* Prevent conflict between multiple on-/offline processing requests. */ |
350e9120 | 543 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 | 544 | return -EAGAIN; |
a2fc8485 PO |
545 | /* Prevent conflict between internal I/Os and on-/offline processing. */ |
546 | if (!dev_fsm_final_state(cdev) && | |
547 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
548 | ret = -EAGAIN; | |
549 | goto out_onoff; | |
550 | } | |
551 | /* Prevent conflict between pending work and on-/offline processing.*/ | |
552 | if (work_pending(&cdev->private->todo_work)) { | |
553 | ret = -EAGAIN; | |
554 | goto out_onoff; | |
555 | } | |
1da177e4 | 556 | |
3bda058b | 557 | if (cdev->drv && !try_module_get(cdev->drv->driver.owner)) { |
a2fc8485 PO |
558 | ret = -EINVAL; |
559 | goto out_onoff; | |
1da177e4 LT |
560 | } |
561 | if (!strncmp(buf, "force\n", count)) { | |
562 | force = 1; | |
563 | i = 1; | |
2f972202 | 564 | ret = 0; |
1da177e4 LT |
565 | } else { |
566 | force = 0; | |
2f972202 | 567 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 568 | } |
2f972202 CH |
569 | if (ret) |
570 | goto out; | |
f5ba6c86 CH |
571 | switch (i) { |
572 | case 0: | |
e74fe0ce | 573 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
574 | break; |
575 | case 1: | |
c78aa6cb | 576 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
577 | break; |
578 | default: | |
2f972202 | 579 | ret = -EINVAL; |
1da177e4 | 580 | } |
2f972202 | 581 | out: |
1da177e4 | 582 | if (cdev->drv) |
3bda058b | 583 | module_put(cdev->drv->driver.owner); |
a2fc8485 | 584 | out_onoff: |
1da177e4 | 585 | atomic_set(&cdev->private->onoff, 0); |
e74fe0ce | 586 | return (ret < 0) ? ret : count; |
1da177e4 LT |
587 | } |
588 | ||
589 | static ssize_t | |
3fd3c0a5 | 590 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
591 | { |
592 | struct ccw_device *cdev = to_ccwdev(dev); | |
593 | struct subchannel *sch; | |
594 | ||
d7b5a4c9 CH |
595 | if (ccw_device_is_orphan(cdev)) |
596 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
597 | switch (cdev->private->state) { |
598 | case DEV_STATE_BOXED: | |
599 | return sprintf(buf, "boxed\n"); | |
600 | case DEV_STATE_DISCONNECTED: | |
601 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
602 | case DEV_STATE_NOT_OPER: | |
603 | sch = to_subchannel(dev->parent); | |
604 | if (!sch->lpm) | |
605 | return sprintf(buf, "no path\n"); | |
606 | else | |
607 | return sprintf(buf, "no device\n"); | |
608 | default: | |
609 | /* All other states considered fine. */ | |
610 | return sprintf(buf, "good\n"); | |
611 | } | |
612 | } | |
613 | ||
fd0457a6 ME |
614 | static ssize_t |
615 | initiate_logging(struct device *dev, struct device_attribute *attr, | |
616 | const char *buf, size_t count) | |
617 | { | |
618 | struct subchannel *sch = to_subchannel(dev); | |
619 | int rc; | |
620 | ||
621 | rc = chsc_siosl(sch->schid); | |
622 | if (rc < 0) { | |
623 | pr_warning("Logging for subchannel 0.%x.%04x failed with " | |
624 | "errno=%d\n", | |
625 | sch->schid.ssid, sch->schid.sch_no, rc); | |
626 | return rc; | |
627 | } | |
628 | pr_notice("Logging for subchannel 0.%x.%04x was triggered\n", | |
629 | sch->schid.ssid, sch->schid.sch_no); | |
630 | return count; | |
631 | } | |
632 | ||
84c57ad5 SO |
633 | static ssize_t vpm_show(struct device *dev, struct device_attribute *attr, |
634 | char *buf) | |
635 | { | |
636 | struct subchannel *sch = to_subchannel(dev); | |
637 | ||
638 | return sprintf(buf, "%02x\n", sch->vpm); | |
639 | } | |
640 | ||
1da177e4 LT |
641 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); |
642 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
643 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
644 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 645 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 646 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 | 647 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
fd0457a6 | 648 | static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); |
84c57ad5 | 649 | static DEVICE_ATTR(vpm, 0444, vpm_show, NULL); |
1da177e4 | 650 | |
7e9db9ea | 651 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
652 | &dev_attr_chpids.attr, |
653 | &dev_attr_pimpampom.attr, | |
fd0457a6 | 654 | &dev_attr_logging.attr, |
84c57ad5 | 655 | &dev_attr_vpm.attr, |
1da177e4 LT |
656 | NULL, |
657 | }; | |
658 | ||
7e9db9ea CH |
659 | static struct attribute_group io_subchannel_attr_group = { |
660 | .attrs = io_subchannel_attrs, | |
529192f3 | 661 | }; |
1da177e4 LT |
662 | |
663 | static struct attribute * ccwdev_attrs[] = { | |
664 | &dev_attr_devtype.attr, | |
665 | &dev_attr_cutype.attr, | |
f1fc78a8 | 666 | &dev_attr_modalias.attr, |
1da177e4 LT |
667 | &dev_attr_online.attr, |
668 | &dev_attr_cmb_enable.attr, | |
669 | &dev_attr_availability.attr, | |
670 | NULL, | |
671 | }; | |
672 | ||
673 | static struct attribute_group ccwdev_attr_group = { | |
674 | .attrs = ccwdev_attrs, | |
675 | }; | |
676 | ||
a4dbd674 | 677 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
678 | &ccwdev_attr_group, |
679 | NULL, | |
680 | }; | |
1da177e4 LT |
681 | |
682 | /* this is a simple abstraction for device_register that sets the | |
683 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 684 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
685 | { |
686 | struct device *dev = &cdev->dev; | |
687 | int ret; | |
688 | ||
689 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
690 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
691 | cdev->private->dev_id.devno); | |
692 | if (ret) | |
693 | return ret; | |
7d253b9a | 694 | return device_add(dev); |
1da177e4 LT |
695 | } |
696 | ||
5d6e6b6f | 697 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 698 | { |
5d6e6b6f PO |
699 | struct ccw_device *cdev = to_ccwdev(dev); |
700 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 701 | |
d7b5a4c9 CH |
702 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
703 | } | |
704 | ||
b7a610f7 SO |
705 | /** |
706 | * get_ccwdev_by_dev_id() - obtain device from a ccw device id | |
707 | * @dev_id: id of the device to be searched | |
708 | * | |
709 | * This function searches all devices attached to the ccw bus for a device | |
710 | * matching @dev_id. | |
711 | * Returns: | |
712 | * If a device is found its reference count is increased and returned; | |
713 | * else %NULL is returned. | |
714 | */ | |
715 | struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) | |
d7b5a4c9 CH |
716 | { |
717 | struct device *dev; | |
718 | ||
5d6e6b6f | 719 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
720 | |
721 | return dev ? to_ccwdev(dev) : NULL; | |
722 | } | |
b7a610f7 | 723 | EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id); |
d7b5a4c9 | 724 | |
37de53bb | 725 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 726 | { |
eb32ae8d | 727 | int ret; |
1da177e4 | 728 | |
7d253b9a | 729 | if (device_is_registered(&cdev->dev)) { |
eb32ae8d CH |
730 | device_release_driver(&cdev->dev); |
731 | ret = device_attach(&cdev->dev); | |
732 | WARN_ON(ret == -ENODEV); | |
733 | } | |
1da177e4 LT |
734 | } |
735 | ||
736 | static void | |
737 | ccw_device_release(struct device *dev) | |
738 | { | |
739 | struct ccw_device *cdev; | |
740 | ||
741 | cdev = to_ccwdev(dev); | |
6eff208f CH |
742 | /* Release reference of parent subchannel. */ |
743 | put_device(cdev->dev.parent); | |
1da177e4 LT |
744 | kfree(cdev->private); |
745 | kfree(cdev); | |
746 | } | |
747 | ||
7674da77 CH |
748 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
749 | { | |
750 | struct ccw_device *cdev; | |
751 | ||
752 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
753 | if (cdev) { | |
754 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
755 | GFP_KERNEL | GFP_DMA); | |
756 | if (cdev->private) | |
757 | return cdev; | |
758 | } | |
759 | kfree(cdev); | |
760 | return ERR_PTR(-ENOMEM); | |
761 | } | |
762 | ||
37de53bb PO |
763 | static void ccw_device_todo(struct work_struct *work); |
764 | ||
7674da77 CH |
765 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
766 | struct ccw_device *cdev) | |
767 | { | |
768 | cdev->private->cdev = cdev; | |
420f42ec | 769 | cdev->private->int_class = IRQIO_CIO; |
7674da77 CH |
770 | atomic_set(&cdev->private->onoff, 0); |
771 | cdev->dev.parent = &sch->dev; | |
772 | cdev->dev.release = ccw_device_release; | |
37de53bb | 773 | INIT_WORK(&cdev->private->todo_work, ccw_device_todo); |
ef99516c | 774 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
775 | /* Do first half of device_register. */ |
776 | device_initialize(&cdev->dev); | |
777 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
778 | /* Release reference from device_initialize(). */ |
779 | put_device(&cdev->dev); | |
7674da77 CH |
780 | return -ENODEV; |
781 | } | |
24a1872d | 782 | cdev->private->flags.initialized = 1; |
7674da77 CH |
783 | return 0; |
784 | } | |
785 | ||
786 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
787 | { | |
788 | struct ccw_device *cdev; | |
789 | int ret; | |
790 | ||
791 | cdev = io_subchannel_allocate_dev(sch); | |
792 | if (!IS_ERR(cdev)) { | |
793 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 794 | if (ret) |
7674da77 | 795 | cdev = ERR_PTR(ret); |
7674da77 CH |
796 | } |
797 | return cdev; | |
798 | } | |
799 | ||
736b5db8 | 800 | static void io_subchannel_recog(struct ccw_device *, struct subchannel *); |
d7b5a4c9 | 801 | |
d7b5a4c9 CH |
802 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
803 | { | |
804 | struct ccw_device *cdev; | |
805 | ||
806 | /* Need to allocate a new ccw device. */ | |
807 | cdev = io_subchannel_create_ccwdev(sch); | |
808 | if (IS_ERR(cdev)) { | |
809 | /* OK, we did everything we could... */ | |
810 | css_sch_device_unregister(sch); | |
811 | return; | |
812 | } | |
d7b5a4c9 | 813 | /* Start recognition for the new ccw device. */ |
736b5db8 | 814 | io_subchannel_recog(cdev, sch); |
d7b5a4c9 CH |
815 | } |
816 | ||
1da177e4 LT |
817 | /* |
818 | * Register recognized device. | |
819 | */ | |
37de53bb | 820 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 821 | { |
1da177e4 | 822 | struct subchannel *sch; |
a290156f | 823 | int ret, adjust_init_count = 1; |
1da177e4 LT |
824 | unsigned long flags; |
825 | ||
1da177e4 | 826 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
827 | /* |
828 | * Check if subchannel is still registered. It may have become | |
829 | * unregistered if a machine check hit us after finishing | |
830 | * device recognition but before the register work could be | |
831 | * queued. | |
832 | */ | |
833 | if (!device_is_registered(&sch->dev)) | |
834 | goto out_err; | |
82b7ac05 | 835 | css_update_ssd_info(sch); |
47af5518 CH |
836 | /* |
837 | * io_subchannel_register() will also be called after device | |
838 | * recognition has been done for a boxed device (which will already | |
839 | * be registered). We need to reprobe since we may now have sense id | |
840 | * information. | |
841 | */ | |
d6a30761 | 842 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
843 | if (!cdev->drv) { |
844 | ret = device_reprobe(&cdev->dev); | |
845 | if (ret) | |
846 | /* We can't do much here. */ | |
139b83dd | 847 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
848 | " %d for 0.%x.%04x\n", ret, |
849 | cdev->private->dev_id.ssid, | |
850 | cdev->private->dev_id.devno); | |
47af5518 | 851 | } |
a290156f | 852 | adjust_init_count = 0; |
1da177e4 LT |
853 | goto out; |
854 | } | |
fa1a8c23 CH |
855 | /* |
856 | * Now we know this subchannel will stay, we can throw | |
857 | * our delayed uevent. | |
858 | */ | |
f67f129e | 859 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 860 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
861 | /* make it known to the system */ |
862 | ret = ccw_device_register(cdev); | |
863 | if (ret) { | |
e556bbbd CH |
864 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
865 | cdev->private->dev_id.ssid, | |
866 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 867 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 868 | sch_set_cdev(sch, NULL); |
2ec22984 | 869 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
870 | /* Release initial device reference. */ |
871 | put_device(&cdev->dev); | |
5fb6b854 | 872 | goto out_err; |
1da177e4 | 873 | } |
1da177e4 LT |
874 | out: |
875 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 876 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 877 | out_err: |
a290156f | 878 | if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count)) |
1da177e4 LT |
879 | wake_up(&ccw_device_init_wq); |
880 | } | |
881 | ||
37de53bb | 882 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 883 | { |
1da177e4 LT |
884 | struct subchannel *sch; |
885 | ||
46fbe4e4 PO |
886 | /* Get subchannel reference for local processing. */ |
887 | if (!get_device(cdev->dev.parent)) | |
888 | return; | |
1da177e4 | 889 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 890 | css_sch_device_unregister(sch); |
46fbe4e4 | 891 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
892 | put_device(&sch->dev); |
893 | } | |
894 | ||
895 | /* | |
896 | * subchannel recognition done. Called from the state machine. | |
897 | */ | |
898 | void | |
899 | io_subchannel_recog_done(struct ccw_device *cdev) | |
900 | { | |
1da177e4 LT |
901 | if (css_init_done == 0) { |
902 | cdev->private->flags.recog_done = 1; | |
903 | return; | |
904 | } | |
905 | switch (cdev->private->state) { | |
47593bfa SO |
906 | case DEV_STATE_BOXED: |
907 | /* Device did not respond in time. */ | |
1da177e4 LT |
908 | case DEV_STATE_NOT_OPER: |
909 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
910 | /* Remove device found not operational. */ |
911 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
912 | if (atomic_dec_and_test(&ccw_device_init_count)) |
913 | wake_up(&ccw_device_init_wq); | |
914 | break; | |
1da177e4 LT |
915 | case DEV_STATE_OFFLINE: |
916 | /* | |
917 | * We can't register the device in interrupt context so | |
918 | * we schedule a work item. | |
919 | */ | |
37de53bb | 920 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
921 | break; |
922 | } | |
923 | } | |
924 | ||
736b5db8 | 925 | static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
1da177e4 | 926 | { |
1da177e4 LT |
927 | struct ccw_device_private *priv; |
928 | ||
2ec22984 | 929 | cdev->ccwlock = sch->lock; |
fb6958a5 | 930 | |
1da177e4 LT |
931 | /* Init private data. */ |
932 | priv = cdev->private; | |
78964268 CH |
933 | priv->dev_id.devno = sch->schib.pmcw.dev; |
934 | priv->dev_id.ssid = sch->schid.ssid; | |
935 | priv->schid = sch->schid; | |
1da177e4 LT |
936 | priv->state = DEV_STATE_NOT_OPER; |
937 | INIT_LIST_HEAD(&priv->cmb_list); | |
938 | init_waitqueue_head(&priv->wait_q); | |
939 | init_timer(&priv->timer); | |
940 | ||
1da177e4 LT |
941 | /* Increase counter of devices currently in recognition. */ |
942 | atomic_inc(&ccw_device_init_count); | |
943 | ||
944 | /* Start async. device sensing. */ | |
2ec22984 | 945 | spin_lock_irq(sch->lock); |
60e4dac1 | 946 | sch_set_cdev(sch, cdev); |
736b5db8 | 947 | ccw_device_recognition(cdev); |
2ec22984 | 948 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
949 | } |
950 | ||
5d6e6b6f PO |
951 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
952 | struct subchannel *sch) | |
d7b5a4c9 | 953 | { |
5d6e6b6f | 954 | struct subchannel *old_sch; |
0c609fca | 955 | int rc, old_enabled = 0; |
d7b5a4c9 | 956 | |
5d6e6b6f PO |
957 | old_sch = to_subchannel(cdev->dev.parent); |
958 | /* Obtain child reference for new parent. */ | |
6eff208f | 959 | if (!get_device(&sch->dev)) |
5d6e6b6f | 960 | return -ENODEV; |
0c609fca SO |
961 | |
962 | if (!sch_is_pseudo_sch(old_sch)) { | |
963 | spin_lock_irq(old_sch->lock); | |
964 | old_enabled = old_sch->schib.pmcw.ena; | |
965 | rc = 0; | |
966 | if (old_enabled) | |
967 | rc = cio_disable_subchannel(old_sch); | |
968 | spin_unlock_irq(old_sch->lock); | |
969 | if (rc == -EBUSY) { | |
970 | /* Release child reference for new parent. */ | |
971 | put_device(&sch->dev); | |
972 | return rc; | |
973 | } | |
974 | } | |
975 | ||
d7b5a4c9 | 976 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 977 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
978 | mutex_unlock(&sch->reg_mutex); |
979 | if (rc) { | |
5d6e6b6f | 980 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
981 | cdev->private->dev_id.ssid, |
982 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f | 983 | sch->schib.pmcw.dev, rc); |
0c609fca SO |
984 | if (old_enabled) { |
985 | /* Try to reenable the old subchannel. */ | |
986 | spin_lock_irq(old_sch->lock); | |
987 | cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); | |
988 | spin_unlock_irq(old_sch->lock); | |
989 | } | |
5d6e6b6f | 990 | /* Release child reference for new parent. */ |
6eff208f | 991 | put_device(&sch->dev); |
5d6e6b6f | 992 | return rc; |
d7b5a4c9 | 993 | } |
5d6e6b6f PO |
994 | /* Clean up old subchannel. */ |
995 | if (!sch_is_pseudo_sch(old_sch)) { | |
996 | spin_lock_irq(old_sch->lock); | |
997 | sch_set_cdev(old_sch, NULL); | |
5d6e6b6f PO |
998 | spin_unlock_irq(old_sch->lock); |
999 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 1000 | } |
5d6e6b6f PO |
1001 | /* Release child reference for old parent. */ |
1002 | put_device(&old_sch->dev); | |
1003 | /* Initialize new subchannel. */ | |
1004 | spin_lock_irq(sch->lock); | |
1005 | cdev->private->schid = sch->schid; | |
1006 | cdev->ccwlock = sch->lock; | |
1007 | if (!sch_is_pseudo_sch(sch)) | |
1008 | sch_set_cdev(sch, cdev); | |
1009 | spin_unlock_irq(sch->lock); | |
1010 | if (!sch_is_pseudo_sch(sch)) | |
1011 | css_update_ssd_info(sch); | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
1016 | { | |
1017 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1018 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
1019 | ||
1020 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
1021 | } |
1022 | ||
602b20f2 CH |
1023 | static void io_subchannel_irq(struct subchannel *sch) |
1024 | { | |
1025 | struct ccw_device *cdev; | |
1026 | ||
db6a6423 | 1027 | cdev = sch_get_cdev(sch); |
602b20f2 | 1028 | |
efd986db SO |
1029 | CIO_TRACE_EVENT(6, "IRQ"); |
1030 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
1031 | if (cdev) |
1032 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
de400d6b | 1033 | else |
420f42ec | 1034 | inc_irq_stat(IRQIO_CIO); |
602b20f2 CH |
1035 | } |
1036 | ||
13952ec1 SO |
1037 | void io_subchannel_init_config(struct subchannel *sch) |
1038 | { | |
1039 | memset(&sch->config, 0, sizeof(sch->config)); | |
1040 | sch->config.csense = 1; | |
13952ec1 SO |
1041 | } |
1042 | ||
0ae7a7b2 CH |
1043 | static void io_subchannel_init_fields(struct subchannel *sch) |
1044 | { | |
1045 | if (cio_is_console(sch->schid)) | |
1046 | sch->opm = 0xff; | |
1047 | else | |
1048 | sch->opm = chp_get_sch_opm(sch); | |
1049 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1050 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1051 | |
1052 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1053 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1054 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1055 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1056 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
1057 | |
1058 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
1059 | } |
1060 | ||
90ed2b69 CH |
1061 | /* |
1062 | * Note: We always return 0 so that we bind to the device even on error. | |
1063 | * This is needed so that our remove function is called on unregister. | |
1064 | */ | |
0ae7a7b2 | 1065 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 1066 | { |
f92519e8 | 1067 | struct io_subchannel_private *io_priv; |
1da177e4 LT |
1068 | struct ccw_device *cdev; |
1069 | int rc; | |
1da177e4 | 1070 | |
6d7c5afc | 1071 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
1072 | rc = sysfs_create_group(&sch->dev.kobj, |
1073 | &io_subchannel_attr_group); | |
1074 | if (rc) | |
1075 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1076 | "attributes for subchannel " | |
1077 | "0.%x.%04x (rc=%d)\n", | |
1078 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1079 | /* |
6d7c5afc | 1080 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1081 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1082 | * the ccw_device and exit. |
1da177e4 | 1083 | */ |
f67f129e | 1084 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1085 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1086 | cdev = sch_get_cdev(sch); |
afdfed0f SO |
1087 | rc = ccw_device_register(cdev); |
1088 | if (rc) { | |
1089 | /* Release online reference. */ | |
1090 | put_device(&cdev->dev); | |
1091 | goto out_schedule; | |
1092 | } | |
0ad8f714 SO |
1093 | if (atomic_dec_and_test(&ccw_device_init_count)) |
1094 | wake_up(&ccw_device_init_wq); | |
1da177e4 LT |
1095 | return 0; |
1096 | } | |
0ae7a7b2 | 1097 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1098 | rc = cio_commit_config(sch); |
1099 | if (rc) | |
1100 | goto out_schedule; | |
7e9db9ea CH |
1101 | rc = sysfs_create_group(&sch->dev.kobj, |
1102 | &io_subchannel_attr_group); | |
1103 | if (rc) | |
90ed2b69 | 1104 | goto out_schedule; |
cd6b4f27 | 1105 | /* Allocate I/O subchannel private data. */ |
f92519e8 SO |
1106 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); |
1107 | if (!io_priv) | |
48e4c385 | 1108 | goto out_schedule; |
f92519e8 SO |
1109 | |
1110 | set_io_private(sch, io_priv); | |
5d6e6b6f | 1111 | css_schedule_eval(sch->schid); |
7e9db9ea | 1112 | return 0; |
48e4c385 | 1113 | |
90ed2b69 | 1114 | out_schedule: |
390935ac PO |
1115 | spin_lock_irq(sch->lock); |
1116 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1117 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1118 | return 0; |
1da177e4 LT |
1119 | } |
1120 | ||
1da177e4 | 1121 | static int |
8bbace7e | 1122 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 | 1123 | { |
f92519e8 | 1124 | struct io_subchannel_private *io_priv = to_io_private(sch); |
1da177e4 | 1125 | struct ccw_device *cdev; |
1da177e4 | 1126 | |
db6a6423 CH |
1127 | cdev = sch_get_cdev(sch); |
1128 | if (!cdev) | |
48e4c385 | 1129 | goto out_free; |
6e9a0f67 | 1130 | io_subchannel_quiesce(sch); |
1da177e4 | 1131 | /* Set ccw device to not operational and drop reference. */ |
7a8ad100 | 1132 | spin_lock_irq(cdev->ccwlock); |
db6a6423 | 1133 | sch_set_cdev(sch, NULL); |
f92519e8 | 1134 | set_io_private(sch, NULL); |
1da177e4 | 1135 | cdev->private->state = DEV_STATE_NOT_OPER; |
7a8ad100 | 1136 | spin_unlock_irq(cdev->ccwlock); |
ef99516c | 1137 | ccw_device_unregister(cdev); |
48e4c385 | 1138 | out_free: |
f92519e8 | 1139 | kfree(io_priv); |
7e9db9ea | 1140 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1141 | return 0; |
1142 | } | |
1143 | ||
602b20f2 | 1144 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1145 | { |
1146 | struct ccw_device *cdev; | |
1147 | ||
db6a6423 | 1148 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1149 | if (cdev) |
1150 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1151 | } | |
1152 | ||
c820de39 CH |
1153 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1154 | { | |
1155 | struct ccw_device *cdev; | |
1156 | ||
1157 | cdev = sch_get_cdev(sch); | |
1158 | if (!cdev) | |
1159 | return; | |
4257aaec PO |
1160 | if (cio_update_schib(sch)) |
1161 | goto err; | |
1162 | /* Check for I/O on path. */ | |
1163 | if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) | |
1164 | goto out; | |
1165 | if (cdev->private->state == DEV_STATE_ONLINE) { | |
1166 | ccw_device_kill_io(cdev); | |
1167 | goto out; | |
1168 | } | |
1169 | if (cio_clear(sch)) | |
1170 | goto err; | |
1171 | out: | |
1172 | /* Trigger path verification. */ | |
1173 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1174 | return; | |
c820de39 | 1175 | |
4257aaec PO |
1176 | err: |
1177 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
c820de39 CH |
1178 | } |
1179 | ||
99611f87 CH |
1180 | static int io_subchannel_chp_event(struct subchannel *sch, |
1181 | struct chp_link *link, int event) | |
c820de39 | 1182 | { |
585b954e | 1183 | struct ccw_device *cdev = sch_get_cdev(sch); |
c820de39 | 1184 | int mask; |
c820de39 | 1185 | |
99611f87 | 1186 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1187 | if (!mask) |
1188 | return 0; | |
1189 | switch (event) { | |
1190 | case CHP_VARY_OFF: | |
1191 | sch->opm &= ~mask; | |
1192 | sch->lpm &= ~mask; | |
585b954e SO |
1193 | if (cdev) |
1194 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1195 | io_subchannel_terminate_path(sch, mask); |
1196 | break; | |
1197 | case CHP_VARY_ON: | |
1198 | sch->opm |= mask; | |
1199 | sch->lpm |= mask; | |
585b954e SO |
1200 | if (cdev) |
1201 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1202 | io_subchannel_verify(sch); |
1203 | break; | |
1204 | case CHP_OFFLINE: | |
cdb912a4 | 1205 | if (cio_update_schib(sch)) |
c820de39 | 1206 | return -ENODEV; |
585b954e SO |
1207 | if (cdev) |
1208 | cdev->private->path_gone_mask |= mask; | |
c820de39 CH |
1209 | io_subchannel_terminate_path(sch, mask); |
1210 | break; | |
1211 | case CHP_ONLINE: | |
cdb912a4 SO |
1212 | if (cio_update_schib(sch)) |
1213 | return -ENODEV; | |
c820de39 | 1214 | sch->lpm |= mask & sch->opm; |
585b954e SO |
1215 | if (cdev) |
1216 | cdev->private->path_new_mask |= mask; | |
c820de39 CH |
1217 | io_subchannel_verify(sch); |
1218 | break; | |
1219 | } | |
1220 | return 0; | |
1221 | } | |
1222 | ||
6e9a0f67 | 1223 | static void io_subchannel_quiesce(struct subchannel *sch) |
1da177e4 | 1224 | { |
1da177e4 LT |
1225 | struct ccw_device *cdev; |
1226 | int ret; | |
1227 | ||
56e6b796 | 1228 | spin_lock_irq(sch->lock); |
db6a6423 | 1229 | cdev = sch_get_cdev(sch); |
a8237fc4 | 1230 | if (cio_is_console(sch->schid)) |
56e6b796 | 1231 | goto out_unlock; |
1da177e4 | 1232 | if (!sch->schib.pmcw.ena) |
56e6b796 | 1233 | goto out_unlock; |
1da177e4 LT |
1234 | ret = cio_disable_subchannel(sch); |
1235 | if (ret != -EBUSY) | |
56e6b796 | 1236 | goto out_unlock; |
1da177e4 | 1237 | if (cdev->handler) |
56e6b796 SO |
1238 | cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); |
1239 | while (ret == -EBUSY) { | |
1240 | cdev->private->state = DEV_STATE_QUIESCE; | |
376ae475 | 1241 | cdev->private->iretry = 255; |
56e6b796 SO |
1242 | ret = ccw_device_cancel_halt_clear(cdev); |
1243 | if (ret == -EBUSY) { | |
1244 | ccw_device_set_timeout(cdev, HZ/10); | |
1245 | spin_unlock_irq(sch->lock); | |
1246 | wait_event(cdev->private->wait_q, | |
1247 | cdev->private->state != DEV_STATE_QUIESCE); | |
1248 | spin_lock_irq(sch->lock); | |
1249 | } | |
1250 | ret = cio_disable_subchannel(sch); | |
1da177e4 | 1251 | } |
56e6b796 SO |
1252 | out_unlock: |
1253 | spin_unlock_irq(sch->lock); | |
1da177e4 LT |
1254 | } |
1255 | ||
6e9a0f67 SO |
1256 | static void io_subchannel_shutdown(struct subchannel *sch) |
1257 | { | |
1258 | io_subchannel_quiesce(sch); | |
1259 | } | |
1260 | ||
c820de39 CH |
1261 | static int device_is_disconnected(struct ccw_device *cdev) |
1262 | { | |
1263 | if (!cdev) | |
1264 | return 0; | |
1265 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1266 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1267 | } | |
1268 | ||
1269 | static int recovery_check(struct device *dev, void *data) | |
1270 | { | |
1271 | struct ccw_device *cdev = to_ccwdev(dev); | |
1272 | int *redo = data; | |
1273 | ||
1274 | spin_lock_irq(cdev->ccwlock); | |
1275 | switch (cdev->private->state) { | |
1276 | case DEV_STATE_DISCONNECTED: | |
1277 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1278 | cdev->private->dev_id.ssid, | |
1279 | cdev->private->dev_id.devno); | |
1280 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1281 | *redo = 1; | |
1282 | break; | |
1283 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1284 | *redo = 1; | |
1285 | break; | |
1286 | } | |
1287 | spin_unlock_irq(cdev->ccwlock); | |
1288 | ||
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | static void recovery_work_func(struct work_struct *unused) | |
1293 | { | |
1294 | int redo = 0; | |
1295 | ||
1296 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1297 | if (redo) { | |
1298 | spin_lock_irq(&recovery_lock); | |
1299 | if (!timer_pending(&recovery_timer)) { | |
1300 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1301 | recovery_phase++; | |
1302 | mod_timer(&recovery_timer, jiffies + | |
1303 | recovery_delay[recovery_phase] * HZ); | |
1304 | } | |
1305 | spin_unlock_irq(&recovery_lock); | |
1306 | } else | |
1307 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1308 | } | |
1309 | ||
1310 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1311 | ||
1312 | static void recovery_func(unsigned long data) | |
1313 | { | |
1314 | /* | |
1315 | * We can't do our recovery in softirq context and it's not | |
1316 | * performance critical, so we schedule it. | |
1317 | */ | |
1318 | schedule_work(&recovery_work); | |
1319 | } | |
1320 | ||
1321 | static void ccw_device_schedule_recovery(void) | |
1322 | { | |
1323 | unsigned long flags; | |
1324 | ||
1325 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1326 | spin_lock_irqsave(&recovery_lock, flags); | |
1327 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1328 | recovery_phase = 0; | |
1329 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1330 | } | |
1331 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1332 | } | |
1333 | ||
ecf5d9ef PO |
1334 | static int purge_fn(struct device *dev, void *data) |
1335 | { | |
1336 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1337 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1338 | |
1339 | spin_lock_irq(cdev->ccwlock); | |
37de53bb | 1340 | if (is_blacklisted(id->ssid, id->devno) && |
a2fc8485 PO |
1341 | (cdev->private->state == DEV_STATE_OFFLINE) && |
1342 | (atomic_cmpxchg(&cdev->private->onoff, 0, 1) == 0)) { | |
37de53bb PO |
1343 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, |
1344 | id->devno); | |
1345 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
a2fc8485 | 1346 | atomic_set(&cdev->private->onoff, 0); |
37de53bb | 1347 | } |
ecf5d9ef | 1348 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1349 | /* Abort loop in case of pending signal. */ |
1350 | if (signal_pending(current)) | |
1351 | return -EINTR; | |
1352 | ||
1353 | return 0; | |
1354 | } | |
1355 | ||
1356 | /** | |
1357 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1358 | * | |
1359 | * Unregister all ccw devices that are offline and on the blacklist. | |
1360 | */ | |
1361 | int ccw_purge_blacklisted(void) | |
1362 | { | |
1363 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1364 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1365 | return 0; | |
1366 | } | |
1367 | ||
6afcc775 | 1368 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1369 | { |
1370 | if (!cdev) | |
1371 | return; | |
1372 | ccw_device_set_timeout(cdev, 0); | |
1373 | cdev->private->flags.fake_irb = 0; | |
1374 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1375 | if (cdev->online) | |
1376 | ccw_device_schedule_recovery(); | |
1377 | } | |
1378 | ||
91c36919 PO |
1379 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1380 | { | |
1381 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1382 | ||
1383 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1384 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1385 | ccw_device_set_timeout(cdev, 0); |
1386 | cio_disable_subchannel(sch); | |
1387 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1388 | } | |
1389 | ||
5d6e6b6f PO |
1390 | enum io_sch_action { |
1391 | IO_SCH_UNREG, | |
1392 | IO_SCH_ORPH_UNREG, | |
1393 | IO_SCH_ATTACH, | |
1394 | IO_SCH_UNREG_ATTACH, | |
1395 | IO_SCH_ORPH_ATTACH, | |
1396 | IO_SCH_REPROBE, | |
1397 | IO_SCH_VERIFY, | |
1398 | IO_SCH_DISC, | |
1399 | IO_SCH_NOP, | |
1400 | }; | |
1401 | ||
1402 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1403 | { | |
1404 | struct ccw_device *cdev; | |
1405 | ||
1406 | cdev = sch_get_cdev(sch); | |
1407 | if (cio_update_schib(sch)) { | |
1408 | /* Not operational. */ | |
1409 | if (!cdev) | |
1410 | return IO_SCH_UNREG; | |
76e6fb4b | 1411 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1412 | return IO_SCH_UNREG; |
1413 | return IO_SCH_ORPH_UNREG; | |
1414 | } | |
1415 | /* Operational. */ | |
1416 | if (!cdev) | |
1417 | return IO_SCH_ATTACH; | |
1418 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
76e6fb4b | 1419 | if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) |
5d6e6b6f PO |
1420 | return IO_SCH_UNREG_ATTACH; |
1421 | return IO_SCH_ORPH_ATTACH; | |
1422 | } | |
1423 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
76e6fb4b | 1424 | if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) |
5d6e6b6f PO |
1425 | return IO_SCH_UNREG; |
1426 | return IO_SCH_DISC; | |
1427 | } | |
1428 | if (device_is_disconnected(cdev)) | |
1429 | return IO_SCH_REPROBE; | |
31370f75 | 1430 | if (cdev->online && !cdev->private->flags.resuming) |
5d6e6b6f | 1431 | return IO_SCH_VERIFY; |
43d0be75 SO |
1432 | if (cdev->private->state == DEV_STATE_NOT_OPER) |
1433 | return IO_SCH_UNREG_ATTACH; | |
5d6e6b6f PO |
1434 | return IO_SCH_NOP; |
1435 | } | |
1436 | ||
1437 | /** | |
1438 | * io_subchannel_sch_event - process subchannel event | |
1439 | * @sch: subchannel | |
1440 | * @process: non-zero if function is called in process context | |
1441 | * | |
1442 | * An unspecified event occurred for this subchannel. Adjust data according | |
1443 | * to the current operational state of the subchannel and device. Return | |
1444 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1445 | * function should be called again in process context. | |
1446 | */ | |
1447 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1448 | { |
c820de39 | 1449 | unsigned long flags; |
c820de39 | 1450 | struct ccw_device *cdev; |
5d6e6b6f PO |
1451 | struct ccw_dev_id dev_id; |
1452 | enum io_sch_action action; | |
1453 | int rc = -EAGAIN; | |
c820de39 CH |
1454 | |
1455 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1456 | if (!device_is_registered(&sch->dev)) |
1457 | goto out_unlock; | |
390935ac PO |
1458 | if (work_pending(&sch->todo_work)) |
1459 | goto out_unlock; | |
37de53bb PO |
1460 | cdev = sch_get_cdev(sch); |
1461 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1462 | goto out_unlock; | |
5d6e6b6f PO |
1463 | action = sch_get_action(sch); |
1464 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1465 | sch->schid.ssid, sch->schid.sch_no, process, | |
1466 | action); | |
1467 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1468 | switch (action) { |
1469 | case IO_SCH_REPROBE: | |
1470 | /* Trigger device recognition. */ | |
1471 | ccw_device_trigger_reprobe(cdev); | |
1472 | rc = 0; | |
1473 | goto out_unlock; | |
1474 | case IO_SCH_VERIFY: | |
1475 | /* Trigger path verification. */ | |
1476 | io_subchannel_verify(sch); | |
1477 | rc = 0; | |
1478 | goto out_unlock; | |
1479 | case IO_SCH_DISC: | |
1480 | ccw_device_set_disconnected(cdev); | |
1481 | rc = 0; | |
1482 | goto out_unlock; | |
1483 | case IO_SCH_ORPH_UNREG: | |
1484 | case IO_SCH_ORPH_ATTACH: | |
1485 | ccw_device_set_disconnected(cdev); | |
1486 | break; | |
1487 | case IO_SCH_UNREG_ATTACH: | |
1488 | case IO_SCH_UNREG: | |
16d2ce27 SO |
1489 | if (!cdev) |
1490 | break; | |
1491 | if (cdev->private->state == DEV_STATE_SENSE_ID) { | |
1492 | /* | |
1493 | * Note: delayed work triggered by this event | |
1494 | * and repeated calls to sch_event are synchronized | |
1495 | * by the above check for work_pending(cdev). | |
1496 | */ | |
1497 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1498 | } else | |
5d6e6b6f PO |
1499 | ccw_device_set_notoper(cdev); |
1500 | break; | |
1501 | case IO_SCH_NOP: | |
1502 | rc = 0; | |
1503 | goto out_unlock; | |
1504 | default: | |
1505 | break; | |
c820de39 | 1506 | } |
5d6e6b6f PO |
1507 | spin_unlock_irqrestore(sch->lock, flags); |
1508 | /* All other actions require process context. */ | |
1509 | if (!process) | |
1510 | goto out; | |
1511 | /* Handle attached ccw device. */ | |
1512 | switch (action) { | |
1513 | case IO_SCH_ORPH_UNREG: | |
1514 | case IO_SCH_ORPH_ATTACH: | |
1515 | /* Move ccw device to orphanage. */ | |
1516 | rc = ccw_device_move_to_orph(cdev); | |
1517 | if (rc) | |
1518 | goto out; | |
c820de39 | 1519 | break; |
5d6e6b6f | 1520 | case IO_SCH_UNREG_ATTACH: |
3368ba25 | 1521 | spin_lock_irqsave(sch->lock, flags); |
74b6127e SO |
1522 | if (cdev->private->flags.resuming) { |
1523 | /* Device will be handled later. */ | |
1524 | rc = 0; | |
3368ba25 | 1525 | goto out_unlock; |
74b6127e | 1526 | } |
3368ba25 SO |
1527 | sch_set_cdev(sch, NULL); |
1528 | spin_unlock_irqrestore(sch->lock, flags); | |
5d6e6b6f | 1529 | /* Unregister ccw device. */ |
74b6127e | 1530 | ccw_device_unregister(cdev); |
c820de39 | 1531 | break; |
5d6e6b6f | 1532 | default: |
c820de39 CH |
1533 | break; |
1534 | } | |
5d6e6b6f | 1535 | /* Handle subchannel. */ |
c820de39 | 1536 | switch (action) { |
5d6e6b6f PO |
1537 | case IO_SCH_ORPH_UNREG: |
1538 | case IO_SCH_UNREG: | |
0d01bb89 SO |
1539 | if (!cdev || !cdev->private->flags.resuming) |
1540 | css_sch_device_unregister(sch); | |
c820de39 | 1541 | break; |
5d6e6b6f PO |
1542 | case IO_SCH_ORPH_ATTACH: |
1543 | case IO_SCH_UNREG_ATTACH: | |
1544 | case IO_SCH_ATTACH: | |
1545 | dev_id.ssid = sch->schid.ssid; | |
1546 | dev_id.devno = sch->schib.pmcw.dev; | |
1547 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1548 | if (!cdev) { | |
1549 | sch_create_and_recog_new_device(sch); | |
1550 | break; | |
1551 | } | |
1552 | rc = ccw_device_move_to_sch(cdev, sch); | |
1553 | if (rc) { | |
1554 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1555 | put_device(&cdev->dev); | |
1556 | goto out; | |
1557 | } | |
1558 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1559 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1560 | spin_unlock_irqrestore(sch->lock, flags); |
1561 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1562 | put_device(&cdev->dev); | |
91c36919 | 1563 | break; |
c820de39 CH |
1564 | default: |
1565 | break; | |
1566 | } | |
5d6e6b6f | 1567 | return 0; |
c820de39 | 1568 | |
5d6e6b6f PO |
1569 | out_unlock: |
1570 | spin_unlock_irqrestore(sch->lock, flags); | |
1571 | out: | |
1572 | return rc; | |
c820de39 CH |
1573 | } |
1574 | ||
1da177e4 | 1575 | #ifdef CONFIG_CCW_CONSOLE |
0ae7a7b2 CH |
1576 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1577 | struct subchannel *sch) | |
1da177e4 LT |
1578 | { |
1579 | int rc; | |
1580 | ||
0ae7a7b2 | 1581 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1582 | rc = cio_commit_config(sch); |
1583 | if (rc) | |
1584 | return rc; | |
0ae7a7b2 | 1585 | sch->driver = &io_subchannel_driver; |
ffa8d2a3 | 1586 | sch_set_cdev(sch, cdev); |
736b5db8 | 1587 | io_subchannel_recog(cdev, sch); |
1da177e4 LT |
1588 | /* Now wait for the async. recognition to come to an end. */ |
1589 | spin_lock_irq(cdev->ccwlock); | |
1590 | while (!dev_fsm_final_state(cdev)) | |
188561a4 SO |
1591 | ccw_device_wait_idle(cdev); |
1592 | ||
afdfed0f SO |
1593 | /* Hold on to an extra reference while device is online. */ |
1594 | get_device(&cdev->dev); | |
1595 | rc = ccw_device_online(cdev); | |
1596 | if (rc) | |
1da177e4 | 1597 | goto out_unlock; |
afdfed0f | 1598 | |
1da177e4 | 1599 | while (!dev_fsm_final_state(cdev)) |
188561a4 SO |
1600 | ccw_device_wait_idle(cdev); |
1601 | ||
afdfed0f SO |
1602 | if (cdev->private->state == DEV_STATE_ONLINE) |
1603 | cdev->online = 1; | |
1604 | else | |
1605 | rc = -EIO; | |
1da177e4 LT |
1606 | out_unlock: |
1607 | spin_unlock_irq(cdev->ccwlock); | |
afdfed0f SO |
1608 | if (rc) /* Give up online reference since onlining failed. */ |
1609 | put_device(&cdev->dev); | |
736b5db8 | 1610 | return rc; |
1da177e4 LT |
1611 | } |
1612 | ||
afdfed0f | 1613 | struct ccw_device *ccw_device_probe_console(void) |
1da177e4 | 1614 | { |
863fc849 | 1615 | struct io_subchannel_private *io_priv; |
afdfed0f | 1616 | struct ccw_device *cdev; |
1da177e4 LT |
1617 | struct subchannel *sch; |
1618 | int ret; | |
1619 | ||
1da177e4 | 1620 | sch = cio_probe_console(); |
afdfed0f SO |
1621 | if (IS_ERR(sch)) |
1622 | return ERR_CAST(sch); | |
863fc849 SO |
1623 | |
1624 | io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); | |
1625 | if (!io_priv) { | |
1626 | put_device(&sch->dev); | |
1627 | return ERR_PTR(-ENOMEM); | |
1628 | } | |
afdfed0f SO |
1629 | cdev = io_subchannel_create_ccwdev(sch); |
1630 | if (IS_ERR(cdev)) { | |
1631 | put_device(&sch->dev); | |
1632 | kfree(io_priv); | |
1633 | return cdev; | |
1634 | } | |
863fc849 | 1635 | set_io_private(sch, io_priv); |
afdfed0f | 1636 | ret = ccw_device_console_enable(cdev, sch); |
1da177e4 | 1637 | if (ret) { |
863fc849 SO |
1638 | set_io_private(sch, NULL); |
1639 | put_device(&sch->dev); | |
afdfed0f | 1640 | put_device(&cdev->dev); |
863fc849 | 1641 | kfree(io_priv); |
1da177e4 LT |
1642 | return ERR_PTR(ret); |
1643 | } | |
afdfed0f | 1644 | return cdev; |
1da177e4 | 1645 | } |
1f4e7eda | 1646 | |
188561a4 SO |
1647 | /** |
1648 | * ccw_device_wait_idle() - busy wait for device to become idle | |
1649 | * @cdev: ccw device | |
1650 | * | |
1651 | * Poll until activity control is zero, that is, no function or data | |
1652 | * transfer is pending/active. | |
1653 | * Called with device lock being held. | |
1654 | */ | |
1655 | void ccw_device_wait_idle(struct ccw_device *cdev) | |
1656 | { | |
1657 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1658 | ||
1659 | while (1) { | |
1660 | cio_tsch(sch); | |
1661 | if (sch->schib.scsw.cmd.actl == 0) | |
1662 | break; | |
1663 | udelay_simple(100); | |
1664 | } | |
1665 | } | |
1666 | ||
6664845c MS |
1667 | static int ccw_device_pm_restore(struct device *dev); |
1668 | ||
f10ccca7 | 1669 | int ccw_device_force_console(struct ccw_device *cdev) |
6664845c | 1670 | { |
f10ccca7 | 1671 | return ccw_device_pm_restore(&cdev->dev); |
6664845c MS |
1672 | } |
1673 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1674 | #endif |
1675 | ||
1676 | /* | |
1677 | * get ccw_device matching the busid, but only if owned by cdrv | |
1678 | */ | |
b0744bd2 CH |
1679 | static int |
1680 | __ccwdev_check_busid(struct device *dev, void *id) | |
1681 | { | |
1682 | char *bus_id; | |
1683 | ||
12975aef | 1684 | bus_id = id; |
b0744bd2 | 1685 | |
98df67b3 | 1686 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1687 | } |
1688 | ||
1689 | ||
b2ffd8e9 CH |
1690 | /** |
1691 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1692 | * @cdrv: driver the device is owned by | |
1693 | * @bus_id: bus id of the device to be searched | |
1694 | * | |
1695 | * This function searches all devices owned by @cdrv for a device with a bus | |
1696 | * id matching @bus_id. | |
1697 | * Returns: | |
1698 | * If a match is found, its reference count of the found device is increased | |
1699 | * and it is returned; else %NULL is returned. | |
1700 | */ | |
1701 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1702 | const char *bus_id) | |
1da177e4 | 1703 | { |
b0744bd2 | 1704 | struct device *dev; |
1da177e4 | 1705 | |
9f30ea95 | 1706 | dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id, |
b0744bd2 | 1707 | __ccwdev_check_busid); |
1da177e4 | 1708 | |
d2c993d8 | 1709 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1710 | } |
1711 | ||
1712 | /************************** device driver handling ************************/ | |
1713 | ||
1714 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1715 | * and release methods are initially very similar to the device_driver | |
1716 | * implementations, with the difference that they have ccw_device | |
1717 | * arguments. | |
1718 | * | |
1719 | * A ccw driver also contains the information that is needed for | |
1720 | * device matching. | |
1721 | */ | |
1722 | static int | |
1723 | ccw_device_probe (struct device *dev) | |
1724 | { | |
1725 | struct ccw_device *cdev = to_ccwdev(dev); | |
1726 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1727 | int ret; | |
1728 | ||
1729 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
de400d6b PO |
1730 | /* Note: we interpret class 0 in this context as an uninitialized |
1731 | * field since it translates to a non-I/O interrupt class. */ | |
1732 | if (cdrv->int_class != 0) | |
1733 | cdev->private->int_class = cdrv->int_class; | |
1734 | else | |
420f42ec | 1735 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1736 | |
1737 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1738 | ||
1739 | if (ret) { | |
d2c993d8 | 1740 | cdev->drv = NULL; |
420f42ec | 1741 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1742 | return ret; |
1743 | } | |
1744 | ||
1745 | return 0; | |
1746 | } | |
1747 | ||
1748 | static int | |
1749 | ccw_device_remove (struct device *dev) | |
1750 | { | |
1751 | struct ccw_device *cdev = to_ccwdev(dev); | |
1752 | struct ccw_driver *cdrv = cdev->drv; | |
1753 | int ret; | |
1754 | ||
1da177e4 LT |
1755 | if (cdrv->remove) |
1756 | cdrv->remove(cdev); | |
1757 | if (cdev->online) { | |
1758 | cdev->online = 0; | |
1759 | spin_lock_irq(cdev->ccwlock); | |
1760 | ret = ccw_device_offline(cdev); | |
1761 | spin_unlock_irq(cdev->ccwlock); | |
1762 | if (ret == 0) | |
1763 | wait_event(cdev->private->wait_q, | |
1764 | dev_fsm_final_state(cdev)); | |
1765 | else | |
139b83dd | 1766 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1767 | "device 0.%x.%04x\n", |
1768 | ret, cdev->private->dev_id.ssid, | |
1769 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1770 | /* Give up reference obtained in ccw_device_set_online(). */ |
1771 | put_device(&cdev->dev); | |
1da177e4 LT |
1772 | } |
1773 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1774 | cdev->drv = NULL; |
420f42ec | 1775 | cdev->private->int_class = IRQIO_CIO; |
1da177e4 LT |
1776 | return 0; |
1777 | } | |
1778 | ||
958974fb CH |
1779 | static void ccw_device_shutdown(struct device *dev) |
1780 | { | |
1781 | struct ccw_device *cdev; | |
1782 | ||
1783 | cdev = to_ccwdev(dev); | |
1784 | if (cdev->drv && cdev->drv->shutdown) | |
1785 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1786 | disable_cmf(cdev); |
958974fb CH |
1787 | } |
1788 | ||
823d494a SO |
1789 | static int ccw_device_pm_prepare(struct device *dev) |
1790 | { | |
1791 | struct ccw_device *cdev = to_ccwdev(dev); | |
1792 | ||
37de53bb | 1793 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1794 | return -EAGAIN; |
1795 | /* Fail while device is being set online/offline. */ | |
1796 | if (atomic_read(&cdev->private->onoff)) | |
1797 | return -EAGAIN; | |
1798 | ||
1799 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1800 | return cdev->drv->prepare(cdev); | |
1801 | ||
1802 | return 0; | |
1803 | } | |
1804 | ||
1805 | static void ccw_device_pm_complete(struct device *dev) | |
1806 | { | |
1807 | struct ccw_device *cdev = to_ccwdev(dev); | |
1808 | ||
1809 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1810 | cdev->drv->complete(cdev); | |
1811 | } | |
1812 | ||
1813 | static int ccw_device_pm_freeze(struct device *dev) | |
1814 | { | |
1815 | struct ccw_device *cdev = to_ccwdev(dev); | |
1816 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1817 | int ret, cm_enabled; | |
1818 | ||
1819 | /* Fail suspend while device is in transistional state. */ | |
1820 | if (!dev_fsm_final_state(cdev)) | |
1821 | return -EAGAIN; | |
1822 | if (!cdev->online) | |
1823 | return 0; | |
1824 | if (cdev->drv && cdev->drv->freeze) { | |
1825 | ret = cdev->drv->freeze(cdev); | |
1826 | if (ret) | |
1827 | return ret; | |
1828 | } | |
1829 | ||
1830 | spin_lock_irq(sch->lock); | |
1831 | cm_enabled = cdev->private->cmb != NULL; | |
1832 | spin_unlock_irq(sch->lock); | |
1833 | if (cm_enabled) { | |
1834 | /* Don't have the css write on memory. */ | |
1835 | ret = ccw_set_cmf(cdev, 0); | |
1836 | if (ret) | |
1837 | return ret; | |
1838 | } | |
1839 | /* From here on, disallow device driver I/O. */ | |
1840 | spin_lock_irq(sch->lock); | |
1841 | ret = cio_disable_subchannel(sch); | |
1842 | spin_unlock_irq(sch->lock); | |
1843 | ||
1844 | return ret; | |
1845 | } | |
1846 | ||
1847 | static int ccw_device_pm_thaw(struct device *dev) | |
1848 | { | |
1849 | struct ccw_device *cdev = to_ccwdev(dev); | |
1850 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1851 | int ret, cm_enabled; | |
1852 | ||
1853 | if (!cdev->online) | |
1854 | return 0; | |
1855 | ||
1856 | spin_lock_irq(sch->lock); | |
1857 | /* Allow device driver I/O again. */ | |
1858 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1859 | cm_enabled = cdev->private->cmb != NULL; | |
1860 | spin_unlock_irq(sch->lock); | |
1861 | if (ret) | |
1862 | return ret; | |
1863 | ||
1864 | if (cm_enabled) { | |
1865 | ret = ccw_set_cmf(cdev, 1); | |
1866 | if (ret) | |
1867 | return ret; | |
1868 | } | |
1869 | ||
1870 | if (cdev->drv && cdev->drv->thaw) | |
1871 | ret = cdev->drv->thaw(cdev); | |
1872 | ||
1873 | return ret; | |
1874 | } | |
1875 | ||
1876 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1877 | { | |
1878 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
823d494a | 1879 | |
0d01bb89 SO |
1880 | spin_lock_irq(sch->lock); |
1881 | if (cio_is_console(sch->schid)) { | |
1882 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1883 | goto out_unlock; | |
1884 | } | |
823d494a SO |
1885 | /* |
1886 | * While we were sleeping, devices may have gone or become | |
1887 | * available again. Kick re-detection. | |
1888 | */ | |
823d494a | 1889 | cdev->private->flags.resuming = 1; |
b17295e6 | 1890 | cdev->private->path_new_mask = LPM_ANYPATH; |
817e5000 | 1891 | css_sched_sch_todo(sch, SCH_TODO_EVAL); |
0d01bb89 | 1892 | spin_unlock_irq(sch->lock); |
817e5000 | 1893 | css_wait_for_slow_path(); |
0d01bb89 SO |
1894 | |
1895 | /* cdev may have been moved to a different subchannel. */ | |
1896 | sch = to_subchannel(cdev->dev.parent); | |
1897 | spin_lock_irq(sch->lock); | |
1898 | if (cdev->private->state != DEV_STATE_ONLINE && | |
1899 | cdev->private->state != DEV_STATE_OFFLINE) | |
1900 | goto out_unlock; | |
1901 | ||
736b5db8 | 1902 | ccw_device_recognition(cdev); |
823d494a | 1903 | spin_unlock_irq(sch->lock); |
823d494a SO |
1904 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || |
1905 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
0d01bb89 SO |
1906 | spin_lock_irq(sch->lock); |
1907 | ||
1908 | out_unlock: | |
823d494a | 1909 | cdev->private->flags.resuming = 0; |
0d01bb89 | 1910 | spin_unlock_irq(sch->lock); |
823d494a SO |
1911 | } |
1912 | ||
1913 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1914 | { | |
1915 | cdev->private->state = DEV_STATE_BOXED; | |
76e6fb4b | 1916 | if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK) |
823d494a | 1917 | return 0; |
37de53bb | 1918 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1919 | return -ENODEV; |
1920 | } | |
1921 | ||
1922 | static int resume_handle_disc(struct ccw_device *cdev) | |
1923 | { | |
1924 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
76e6fb4b | 1925 | if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK) |
823d494a | 1926 | return 0; |
37de53bb | 1927 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1928 | return -ENODEV; |
1929 | } | |
1930 | ||
1931 | static int ccw_device_pm_restore(struct device *dev) | |
1932 | { | |
1933 | struct ccw_device *cdev = to_ccwdev(dev); | |
0d01bb89 SO |
1934 | struct subchannel *sch; |
1935 | int ret = 0; | |
823d494a SO |
1936 | |
1937 | __ccw_device_pm_restore(cdev); | |
0d01bb89 | 1938 | sch = to_subchannel(cdev->dev.parent); |
823d494a | 1939 | spin_lock_irq(sch->lock); |
0d01bb89 | 1940 | if (cio_is_console(sch->schid)) |
823d494a | 1941 | goto out_restore; |
0d01bb89 | 1942 | |
823d494a SO |
1943 | /* check recognition results */ |
1944 | switch (cdev->private->state) { | |
1945 | case DEV_STATE_OFFLINE: | |
0d01bb89 SO |
1946 | case DEV_STATE_ONLINE: |
1947 | cdev->private->flags.donotify = 0; | |
823d494a SO |
1948 | break; |
1949 | case DEV_STATE_BOXED: | |
1950 | ret = resume_handle_boxed(cdev); | |
823d494a | 1951 | if (ret) |
0d01bb89 | 1952 | goto out_unlock; |
823d494a | 1953 | goto out_restore; |
823d494a | 1954 | default: |
0d01bb89 SO |
1955 | ret = resume_handle_disc(cdev); |
1956 | if (ret) | |
1957 | goto out_unlock; | |
1958 | goto out_restore; | |
823d494a SO |
1959 | } |
1960 | /* check if the device type has changed */ | |
1961 | if (!ccw_device_test_sense_data(cdev)) { | |
1962 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1963 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1964 | ret = -ENODEV; |
1965 | goto out_unlock; | |
1966 | } | |
0d01bb89 | 1967 | if (!cdev->online) |
823d494a | 1968 | goto out_unlock; |
823d494a | 1969 | |
0d01bb89 SO |
1970 | if (ccw_device_online(cdev)) { |
1971 | ret = resume_handle_disc(cdev); | |
1972 | if (ret) | |
1973 | goto out_unlock; | |
1974 | goto out_restore; | |
1975 | } | |
823d494a | 1976 | spin_unlock_irq(sch->lock); |
823d494a | 1977 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
0d01bb89 SO |
1978 | spin_lock_irq(sch->lock); |
1979 | ||
1980 | if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) { | |
1981 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1982 | ret = -ENODEV; | |
1983 | goto out_unlock; | |
823d494a | 1984 | } |
0d01bb89 SO |
1985 | |
1986 | /* reenable cmf, if needed */ | |
1987 | if (cdev->private->cmb) { | |
1988 | spin_unlock_irq(sch->lock); | |
823d494a | 1989 | ret = ccw_set_cmf(cdev, 1); |
0d01bb89 | 1990 | spin_lock_irq(sch->lock); |
823d494a | 1991 | if (ret) { |
f014824e SO |
1992 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1993 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1994 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1995 | ret = 0; |
1996 | } | |
1997 | } | |
1998 | ||
1999 | out_restore: | |
0d01bb89 | 2000 | spin_unlock_irq(sch->lock); |
823d494a SO |
2001 | if (cdev->online && cdev->drv && cdev->drv->restore) |
2002 | ret = cdev->drv->restore(cdev); | |
823d494a SO |
2003 | return ret; |
2004 | ||
823d494a SO |
2005 | out_unlock: |
2006 | spin_unlock_irq(sch->lock); | |
2007 | return ret; | |
2008 | } | |
2009 | ||
47145210 | 2010 | static const struct dev_pm_ops ccw_pm_ops = { |
823d494a SO |
2011 | .prepare = ccw_device_pm_prepare, |
2012 | .complete = ccw_device_pm_complete, | |
2013 | .freeze = ccw_device_pm_freeze, | |
2014 | .thaw = ccw_device_pm_thaw, | |
2015 | .restore = ccw_device_pm_restore, | |
2016 | }; | |
2017 | ||
d5ab5276 | 2018 | static struct bus_type ccw_bus_type = { |
8bbace7e CH |
2019 | .name = "ccw", |
2020 | .match = ccw_bus_match, | |
2021 | .uevent = ccw_uevent, | |
2022 | .probe = ccw_device_probe, | |
2023 | .remove = ccw_device_remove, | |
958974fb | 2024 | .shutdown = ccw_device_shutdown, |
823d494a | 2025 | .pm = &ccw_pm_ops, |
8bbace7e CH |
2026 | }; |
2027 | ||
b2ffd8e9 CH |
2028 | /** |
2029 | * ccw_driver_register() - register a ccw driver | |
2030 | * @cdriver: driver to be registered | |
2031 | * | |
2032 | * This function is mainly a wrapper around driver_register(). | |
2033 | * Returns: | |
2034 | * %0 on success and a negative error value on failure. | |
2035 | */ | |
2036 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
2037 | { |
2038 | struct device_driver *drv = &cdriver->driver; | |
2039 | ||
2040 | drv->bus = &ccw_bus_type; | |
1da177e4 LT |
2041 | |
2042 | return driver_register(drv); | |
2043 | } | |
2044 | ||
b2ffd8e9 CH |
2045 | /** |
2046 | * ccw_driver_unregister() - deregister a ccw driver | |
2047 | * @cdriver: driver to be deregistered | |
2048 | * | |
2049 | * This function is mainly a wrapper around driver_unregister(). | |
2050 | */ | |
2051 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
2052 | { |
2053 | driver_unregister(&cdriver->driver); | |
2054 | } | |
2055 | ||
37de53bb PO |
2056 | static void ccw_device_todo(struct work_struct *work) |
2057 | { | |
2058 | struct ccw_device_private *priv; | |
2059 | struct ccw_device *cdev; | |
2060 | struct subchannel *sch; | |
2061 | enum cdev_todo todo; | |
2062 | ||
2063 | priv = container_of(work, struct ccw_device_private, todo_work); | |
2064 | cdev = priv->cdev; | |
2065 | sch = to_subchannel(cdev->dev.parent); | |
2066 | /* Find out todo. */ | |
2067 | spin_lock_irq(cdev->ccwlock); | |
2068 | todo = priv->todo; | |
2069 | priv->todo = CDEV_TODO_NOTHING; | |
2070 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
2071 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
2072 | spin_unlock_irq(cdev->ccwlock); | |
2073 | /* Perform todo. */ | |
2074 | switch (todo) { | |
2075 | case CDEV_TODO_ENABLE_CMF: | |
2076 | cmf_reenable(cdev); | |
2077 | break; | |
2078 | case CDEV_TODO_REBIND: | |
2079 | ccw_device_do_unbind_bind(cdev); | |
2080 | break; | |
2081 | case CDEV_TODO_REGISTER: | |
2082 | io_subchannel_register(cdev); | |
2083 | break; | |
2084 | case CDEV_TODO_UNREG_EVAL: | |
2085 | if (!sch_is_pseudo_sch(sch)) | |
2086 | css_schedule_eval(sch->schid); | |
2087 | /* fall-through */ | |
2088 | case CDEV_TODO_UNREG: | |
2089 | if (sch_is_pseudo_sch(sch)) | |
2090 | ccw_device_unregister(cdev); | |
2091 | else | |
2092 | ccw_device_call_sch_unregister(cdev); | |
2093 | break; | |
2094 | default: | |
2095 | break; | |
2096 | } | |
2097 | /* Release workqueue ref. */ | |
2098 | put_device(&cdev->dev); | |
2099 | } | |
2100 | ||
2101 | /** | |
2102 | * ccw_device_sched_todo - schedule ccw device operation | |
2103 | * @cdev: ccw device | |
2104 | * @todo: todo | |
2105 | * | |
2106 | * Schedule the operation identified by @todo to be performed on the slow path | |
2107 | * workqueue. Do nothing if another operation with higher priority is already | |
2108 | * scheduled. Needs to be called with ccwdev lock held. | |
2109 | */ | |
2110 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2111 | { | |
2112 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2113 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2114 | todo); | |
2115 | if (cdev->private->todo >= todo) | |
2116 | return; | |
2117 | cdev->private->todo = todo; | |
2118 | /* Get workqueue ref. */ | |
2119 | if (!get_device(&cdev->dev)) | |
2120 | return; | |
be5d3823 | 2121 | if (!queue_work(cio_work_q, &cdev->private->todo_work)) { |
37de53bb PO |
2122 | /* Already queued, release workqueue ref. */ |
2123 | put_device(&cdev->dev); | |
2124 | } | |
2125 | } | |
2126 | ||
fd0457a6 ME |
2127 | /** |
2128 | * ccw_device_siosl() - initiate logging | |
2129 | * @cdev: ccw device | |
2130 | * | |
2131 | * This function is used to invoke model-dependent logging within the channel | |
2132 | * subsystem. | |
2133 | */ | |
2134 | int ccw_device_siosl(struct ccw_device *cdev) | |
2135 | { | |
2136 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
2137 | ||
2138 | return chsc_siosl(sch->schid); | |
2139 | } | |
2140 | EXPORT_SYMBOL_GPL(ccw_device_siosl); | |
2141 | ||
1da177e4 LT |
2142 | MODULE_LICENSE("GPL"); |
2143 | EXPORT_SYMBOL(ccw_device_set_online); | |
2144 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2145 | EXPORT_SYMBOL(ccw_driver_register); | |
2146 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2147 | EXPORT_SYMBOL(get_ccwdev_by_busid); |