]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
1da177e4 | 4 | * |
c820de39 | 5 | * Copyright IBM Corp. 2002,2008 |
1da177e4 | 6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
4ce3b30c | 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
9 | */ | |
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/init.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/workqueue.h> | |
90ab1336 | 19 | #include <linux/timer.h> |
1da177e4 LT |
20 | |
21 | #include <asm/ccwdev.h> | |
22 | #include <asm/cio.h> | |
4e57b681 | 23 | #include <asm/param.h> /* HZ */ |
1842f2b1 | 24 | #include <asm/cmb.h> |
3a3fc29a | 25 | #include <asm/isc.h> |
1da177e4 | 26 | |
0ae7a7b2 | 27 | #include "chp.h" |
1da177e4 | 28 | #include "cio.h" |
d7b5a4c9 | 29 | #include "cio_debug.h" |
1da177e4 LT |
30 | #include "css.h" |
31 | #include "device.h" | |
32 | #include "ioasm.h" | |
cd6b4f27 | 33 | #include "io_sch.h" |
ecf5d9ef | 34 | #include "blacklist.h" |
1da177e4 | 35 | |
90ab1336 | 36 | static struct timer_list recovery_timer; |
486d0a00 | 37 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
38 | static int recovery_phase; |
39 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
40 | ||
1da177e4 LT |
41 | /******************* bus type handling ***********************/ |
42 | ||
43 | /* The Linux driver model distinguishes between a bus type and | |
44 | * the bus itself. Of course we only have one channel | |
45 | * subsystem driver and one channel system per machine, but | |
46 | * we still use the abstraction. T.R. says it's a good idea. */ | |
47 | static int | |
48 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
49 | { | |
50 | struct ccw_device *cdev = to_ccwdev(dev); | |
51 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
52 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
53 | ||
54 | if (!ids) | |
55 | return 0; | |
56 | ||
57 | found = ccw_device_id_match(ids, &cdev->id); | |
58 | if (!found) | |
59 | return 0; | |
60 | ||
61 | cdev->id.driver_info = found->driver_info; | |
62 | ||
63 | return 1; | |
64 | } | |
65 | ||
db0c2d59 PO |
66 | /* Store modalias string delimited by prefix/suffix string into buffer with |
67 | * specified size. Return length of resulting string (excluding trailing '\0') | |
68 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 69 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 70 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 71 | { |
db0c2d59 | 72 | int len; |
1da177e4 | 73 | |
cfbe9bb2 | 74 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
75 | if (len > size) |
76 | return len; | |
77 | buf += len; | |
78 | size -= len; | |
1da177e4 | 79 | |
db0c2d59 PO |
80 | if (id->dev_type != 0) |
81 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
82 | id->dev_model, suffix); | |
83 | else | |
84 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 85 | |
db0c2d59 PO |
86 | return len; |
87 | } | |
88 | ||
89 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
90 | * non-zero otherwise. */ | |
7eff2e7a | 91 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
92 | { |
93 | struct ccw_device *cdev = to_ccwdev(dev); | |
94 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
95 | int ret; |
96 | char modalias_buf[30]; | |
1da177e4 | 97 | |
db0c2d59 | 98 | /* CU_TYPE= */ |
7eff2e7a | 99 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
100 | if (ret) |
101 | return ret; | |
db0c2d59 PO |
102 | |
103 | /* CU_MODEL= */ | |
7eff2e7a | 104 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
105 | if (ret) |
106 | return ret; | |
1da177e4 LT |
107 | |
108 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 109 | /* DEV_TYPE= */ |
7eff2e7a | 110 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
111 | if (ret) |
112 | return ret; | |
1da177e4 | 113 | |
db0c2d59 | 114 | /* DEV_MODEL= */ |
7eff2e7a | 115 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
116 | if (ret) |
117 | return ret; | |
db0c2d59 PO |
118 | |
119 | /* MODALIAS= */ | |
cfbe9bb2 | 120 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
121 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
122 | return ret; | |
1da177e4 LT |
123 | } |
124 | ||
8bbace7e | 125 | struct bus_type ccw_bus_type; |
1da177e4 | 126 | |
602b20f2 CH |
127 | static void io_subchannel_irq(struct subchannel *); |
128 | static int io_subchannel_probe(struct subchannel *); | |
129 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 130 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 131 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
132 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
133 | int); | |
8ea7f559 SO |
134 | static void recovery_func(unsigned long data); |
135 | struct workqueue_struct *ccw_device_work; | |
136 | wait_queue_head_t ccw_device_init_wq; | |
137 | atomic_t ccw_device_init_count; | |
1da177e4 | 138 | |
f08adc00 CH |
139 | static struct css_device_id io_subchannel_ids[] = { |
140 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
141 | { /* end of list */ }, | |
142 | }; | |
143 | MODULE_DEVICE_TABLE(css, io_subchannel_ids); | |
144 | ||
93a27592 CH |
145 | static int io_subchannel_prepare(struct subchannel *sch) |
146 | { | |
147 | struct ccw_device *cdev; | |
148 | /* | |
149 | * Don't allow suspend while a ccw device registration | |
150 | * is still outstanding. | |
151 | */ | |
152 | cdev = sch_get_cdev(sch); | |
153 | if (cdev && !device_is_registered(&cdev->dev)) | |
154 | return -EAGAIN; | |
155 | return 0; | |
156 | } | |
157 | ||
8ea7f559 SO |
158 | static void io_subchannel_settle(void) |
159 | { | |
160 | wait_event(ccw_device_init_wq, | |
161 | atomic_read(&ccw_device_init_count) == 0); | |
162 | flush_workqueue(ccw_device_work); | |
163 | } | |
164 | ||
f7e5d67c | 165 | static struct css_driver io_subchannel_driver = { |
4beee646 | 166 | .owner = THIS_MODULE, |
f08adc00 | 167 | .subchannel_type = io_subchannel_ids, |
25b7bb58 | 168 | .name = "io_subchannel", |
1da177e4 | 169 | .irq = io_subchannel_irq, |
c820de39 CH |
170 | .sch_event = io_subchannel_sch_event, |
171 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
172 | .probe = io_subchannel_probe, |
173 | .remove = io_subchannel_remove, | |
174 | .shutdown = io_subchannel_shutdown, | |
93a27592 | 175 | .prepare = io_subchannel_prepare, |
8ea7f559 | 176 | .settle = io_subchannel_settle, |
1da177e4 LT |
177 | }; |
178 | ||
2f17644d | 179 | int __init io_subchannel_init(void) |
1da177e4 LT |
180 | { |
181 | int ret; | |
182 | ||
183 | init_waitqueue_head(&ccw_device_init_wq); | |
184 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 185 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 LT |
186 | |
187 | ccw_device_work = create_singlethread_workqueue("cio"); | |
188 | if (!ccw_device_work) | |
2f17644d | 189 | return -ENOMEM; |
1da177e4 LT |
190 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); |
191 | if (!slow_path_wq) { | |
2f17644d | 192 | ret = -ENOMEM; |
1da177e4 LT |
193 | goto out_err; |
194 | } | |
195 | if ((ret = bus_register (&ccw_bus_type))) | |
196 | goto out_err; | |
197 | ||
25b7bb58 CH |
198 | ret = css_driver_register(&io_subchannel_driver); |
199 | if (ret) | |
1da177e4 LT |
200 | goto out_err; |
201 | ||
1da177e4 LT |
202 | return 0; |
203 | out_err: | |
204 | if (ccw_device_work) | |
205 | destroy_workqueue(ccw_device_work); | |
1da177e4 LT |
206 | if (slow_path_wq) |
207 | destroy_workqueue(slow_path_wq); | |
208 | return ret; | |
209 | } | |
210 | ||
1da177e4 LT |
211 | |
212 | /************************ device handling **************************/ | |
213 | ||
214 | /* | |
215 | * A ccw_device has some interfaces in sysfs in addition to the | |
216 | * standard ones. | |
217 | * The following entries are designed to export the information which | |
218 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
219 | * are obvious, so they don't have an entry :) | |
220 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
221 | */ | |
222 | static ssize_t | |
3fd3c0a5 | 223 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
224 | { |
225 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 226 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
227 | ssize_t ret = 0; |
228 | int chp; | |
7ad6a249 PO |
229 | int mask; |
230 | ||
231 | for (chp = 0; chp < 8; chp++) { | |
232 | mask = 0x80 >> chp; | |
233 | if (ssd->path_mask & mask) | |
234 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
235 | else | |
236 | ret += sprintf(buf + ret, "00 "); | |
237 | } | |
1da177e4 LT |
238 | ret += sprintf (buf+ret, "\n"); |
239 | return min((ssize_t)PAGE_SIZE, ret); | |
240 | } | |
241 | ||
242 | static ssize_t | |
3fd3c0a5 | 243 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
244 | { |
245 | struct subchannel *sch = to_subchannel(dev); | |
246 | struct pmcw *pmcw = &sch->schib.pmcw; | |
247 | ||
248 | return sprintf (buf, "%02x %02x %02x\n", | |
249 | pmcw->pim, pmcw->pam, pmcw->pom); | |
250 | } | |
251 | ||
252 | static ssize_t | |
3fd3c0a5 | 253 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
254 | { |
255 | struct ccw_device *cdev = to_ccwdev(dev); | |
256 | struct ccw_device_id *id = &(cdev->id); | |
257 | ||
258 | if (id->dev_type != 0) | |
259 | return sprintf(buf, "%04x/%02x\n", | |
260 | id->dev_type, id->dev_model); | |
261 | else | |
262 | return sprintf(buf, "n/a\n"); | |
263 | } | |
264 | ||
265 | static ssize_t | |
3fd3c0a5 | 266 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
267 | { |
268 | struct ccw_device *cdev = to_ccwdev(dev); | |
269 | struct ccw_device_id *id = &(cdev->id); | |
270 | ||
271 | return sprintf(buf, "%04x/%02x\n", | |
272 | id->cu_type, id->cu_model); | |
273 | } | |
274 | ||
f1fc78a8 BB |
275 | static ssize_t |
276 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
277 | { | |
278 | struct ccw_device *cdev = to_ccwdev(dev); | |
279 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 280 | int len; |
f1fc78a8 | 281 | |
086a6c62 | 282 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
283 | |
284 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
285 | } |
286 | ||
1da177e4 | 287 | static ssize_t |
3fd3c0a5 | 288 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
289 | { |
290 | struct ccw_device *cdev = to_ccwdev(dev); | |
291 | ||
292 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
293 | } | |
294 | ||
d7b5a4c9 CH |
295 | int ccw_device_is_orphan(struct ccw_device *cdev) |
296 | { | |
297 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
298 | } | |
299 | ||
ef99516c | 300 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 301 | { |
3b554a14 | 302 | if (test_and_clear_bit(1, &cdev->private->registered)) { |
ef99516c | 303 | device_del(&cdev->dev); |
3b554a14 SO |
304 | /* Release reference from device_initialize(). */ |
305 | put_device(&cdev->dev); | |
306 | } | |
7674da77 CH |
307 | } |
308 | ||
b2ffd8e9 CH |
309 | /** |
310 | * ccw_device_set_offline() - disable a ccw device for I/O | |
311 | * @cdev: target ccw device | |
312 | * | |
313 | * This function calls the driver's set_offline() function for @cdev, if | |
314 | * given, and then disables @cdev. | |
315 | * Returns: | |
316 | * %0 on success and a negative error value on failure. | |
317 | * Context: | |
318 | * enabled, ccw device lock not held | |
319 | */ | |
320 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 LT |
321 | { |
322 | int ret; | |
323 | ||
324 | if (!cdev) | |
325 | return -ENODEV; | |
326 | if (!cdev->online || !cdev->drv) | |
327 | return -EINVAL; | |
328 | ||
329 | if (cdev->drv->set_offline) { | |
330 | ret = cdev->drv->set_offline(cdev); | |
331 | if (ret != 0) | |
332 | return ret; | |
333 | } | |
334 | cdev->online = 0; | |
335 | spin_lock_irq(cdev->ccwlock); | |
217ee6c6 ME |
336 | /* Wait until a final state or DISCONNECTED is reached */ |
337 | while (!dev_fsm_final_state(cdev) && | |
338 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
1da177e4 | 339 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
340 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
341 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
342 | spin_lock_irq(cdev->ccwlock); | |
1da177e4 | 343 | } |
217ee6c6 ME |
344 | ret = ccw_device_offline(cdev); |
345 | if (ret) | |
346 | goto error; | |
1da177e4 | 347 | spin_unlock_irq(cdev->ccwlock); |
217ee6c6 ME |
348 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || |
349 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
350 | /* Give up reference from ccw_device_set_online(). */ | |
351 | put_device(&cdev->dev); | |
352 | return 0; | |
353 | ||
354 | error: | |
355 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n", | |
356 | ret, cdev->private->dev_id.ssid, | |
357 | cdev->private->dev_id.devno); | |
358 | cdev->private->state = DEV_STATE_OFFLINE; | |
359 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
360 | spin_unlock_irq(cdev->ccwlock); | |
361 | /* Give up reference from ccw_device_set_online(). */ | |
362 | put_device(&cdev->dev); | |
363 | return -ENODEV; | |
1da177e4 LT |
364 | } |
365 | ||
b2ffd8e9 CH |
366 | /** |
367 | * ccw_device_set_online() - enable a ccw device for I/O | |
368 | * @cdev: target ccw device | |
369 | * | |
370 | * This function first enables @cdev and then calls the driver's set_online() | |
371 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
372 | * disabled again. | |
373 | * Returns: | |
374 | * %0 on success and a negative error value on failure. | |
375 | * Context: | |
376 | * enabled, ccw device lock not held | |
377 | */ | |
378 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
379 | { |
380 | int ret; | |
217ee6c6 | 381 | int ret2; |
1da177e4 LT |
382 | |
383 | if (!cdev) | |
384 | return -ENODEV; | |
385 | if (cdev->online || !cdev->drv) | |
386 | return -EINVAL; | |
9cd67421 CH |
387 | /* Hold on to an extra reference while device is online. */ |
388 | if (!get_device(&cdev->dev)) | |
389 | return -ENODEV; | |
1da177e4 LT |
390 | |
391 | spin_lock_irq(cdev->ccwlock); | |
392 | ret = ccw_device_online(cdev); | |
393 | spin_unlock_irq(cdev->ccwlock); | |
394 | if (ret == 0) | |
395 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
396 | else { | |
139b83dd | 397 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
398 | "device 0.%x.%04x\n", |
399 | ret, cdev->private->dev_id.ssid, | |
400 | cdev->private->dev_id.devno); | |
9cd67421 CH |
401 | /* Give up online reference since onlining failed. */ |
402 | put_device(&cdev->dev); | |
1da177e4 LT |
403 | return ret; |
404 | } | |
217ee6c6 ME |
405 | spin_lock_irq(cdev->ccwlock); |
406 | /* Check if online processing was successful */ | |
407 | if ((cdev->private->state != DEV_STATE_ONLINE) && | |
408 | (cdev->private->state != DEV_STATE_W4SENSE)) { | |
409 | spin_unlock_irq(cdev->ccwlock); | |
9cd67421 CH |
410 | /* Give up online reference since onlining failed. */ |
411 | put_device(&cdev->dev); | |
1da177e4 | 412 | return -ENODEV; |
9cd67421 | 413 | } |
217ee6c6 ME |
414 | spin_unlock_irq(cdev->ccwlock); |
415 | if (cdev->drv->set_online) | |
416 | ret = cdev->drv->set_online(cdev); | |
417 | if (ret) | |
418 | goto rollback; | |
419 | cdev->online = 1; | |
420 | return 0; | |
421 | ||
422 | rollback: | |
1da177e4 | 423 | spin_lock_irq(cdev->ccwlock); |
217ee6c6 ME |
424 | /* Wait until a final state or DISCONNECTED is reached */ |
425 | while (!dev_fsm_final_state(cdev) && | |
426 | cdev->private->state != DEV_STATE_DISCONNECTED) { | |
427 | spin_unlock_irq(cdev->ccwlock); | |
428 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
429 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
430 | spin_lock_irq(cdev->ccwlock); | |
431 | } | |
432 | ret2 = ccw_device_offline(cdev); | |
433 | if (ret2) | |
434 | goto error; | |
435 | spin_unlock_irq(cdev->ccwlock); | |
436 | wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || | |
437 | cdev->private->state == DEV_STATE_DISCONNECTED)); | |
438 | /* Give up online reference since onlining failed. */ | |
439 | put_device(&cdev->dev); | |
440 | return ret; | |
441 | ||
442 | error: | |
443 | CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " | |
444 | "device 0.%x.%04x\n", | |
445 | ret2, cdev->private->dev_id.ssid, | |
446 | cdev->private->dev_id.devno); | |
447 | cdev->private->state = DEV_STATE_OFFLINE; | |
1da177e4 | 448 | spin_unlock_irq(cdev->ccwlock); |
9cd67421 CH |
449 | /* Give up online reference since onlining failed. */ |
450 | put_device(&cdev->dev); | |
217ee6c6 | 451 | return ret; |
1da177e4 LT |
452 | } |
453 | ||
e74fe0ce | 454 | static int online_store_handle_offline(struct ccw_device *cdev) |
f5ba6c86 | 455 | { |
37de53bb PO |
456 | if (cdev->private->state == DEV_STATE_DISCONNECTED) { |
457 | spin_lock_irq(cdev->ccwlock); | |
458 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); | |
459 | spin_unlock_irq(cdev->ccwlock); | |
460 | } else if (cdev->online && cdev->drv && cdev->drv->set_offline) | |
e74fe0ce SO |
461 | return ccw_device_set_offline(cdev); |
462 | return 0; | |
f5ba6c86 CH |
463 | } |
464 | ||
465 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
466 | { | |
467 | int ret; | |
468 | ||
469 | /* Do device recognition, if needed. */ | |
99f6a570 | 470 | if (cdev->private->state == DEV_STATE_BOXED) { |
f5ba6c86 CH |
471 | ret = ccw_device_recognition(cdev); |
472 | if (ret) { | |
e556bbbd CH |
473 | CIO_MSG_EVENT(0, "Couldn't start recognition " |
474 | "for device 0.%x.%04x (ret=%d)\n", | |
475 | cdev->private->dev_id.ssid, | |
476 | cdev->private->dev_id.devno, ret); | |
f5ba6c86 CH |
477 | return ret; |
478 | } | |
479 | wait_event(cdev->private->wait_q, | |
480 | cdev->private->flags.recog_done); | |
156013ff SO |
481 | if (cdev->private->state != DEV_STATE_OFFLINE) |
482 | /* recognition failed */ | |
483 | return -EAGAIN; | |
f5ba6c86 CH |
484 | } |
485 | if (cdev->drv && cdev->drv->set_online) | |
486 | ccw_device_set_online(cdev); | |
487 | return 0; | |
488 | } | |
156013ff | 489 | |
c78aa6cb | 490 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
491 | { |
492 | int ret; | |
493 | ||
494 | ret = online_store_recog_and_online(cdev); | |
156013ff | 495 | if (ret && !force) |
c78aa6cb | 496 | return ret; |
f5ba6c86 CH |
497 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
498 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
499 | if (ret) |
500 | return ret; | |
f5ba6c86 CH |
501 | if (cdev->id.cu_type == 0) |
502 | cdev->private->state = DEV_STATE_NOT_OPER; | |
156013ff SO |
503 | ret = online_store_recog_and_online(cdev); |
504 | if (ret) | |
505 | return ret; | |
f5ba6c86 | 506 | } |
c78aa6cb | 507 | return 0; |
f5ba6c86 CH |
508 | } |
509 | ||
510 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
511 | const char *buf, size_t count) | |
1da177e4 LT |
512 | { |
513 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
514 | int force, ret; |
515 | unsigned long i; | |
1da177e4 | 516 | |
b5cd99e6 SO |
517 | if ((cdev->private->state != DEV_STATE_OFFLINE && |
518 | cdev->private->state != DEV_STATE_ONLINE && | |
519 | cdev->private->state != DEV_STATE_BOXED && | |
520 | cdev->private->state != DEV_STATE_DISCONNECTED) || | |
521 | atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) | |
1da177e4 LT |
522 | return -EAGAIN; |
523 | ||
524 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
525 | atomic_set(&cdev->private->onoff, 0); | |
526 | return -EINVAL; | |
527 | } | |
528 | if (!strncmp(buf, "force\n", count)) { | |
529 | force = 1; | |
530 | i = 1; | |
2f972202 | 531 | ret = 0; |
1da177e4 LT |
532 | } else { |
533 | force = 0; | |
2f972202 | 534 | ret = strict_strtoul(buf, 16, &i); |
1da177e4 | 535 | } |
2f972202 CH |
536 | if (ret) |
537 | goto out; | |
f5ba6c86 CH |
538 | switch (i) { |
539 | case 0: | |
e74fe0ce | 540 | ret = online_store_handle_offline(cdev); |
f5ba6c86 CH |
541 | break; |
542 | case 1: | |
c78aa6cb | 543 | ret = online_store_handle_online(cdev, force); |
f5ba6c86 CH |
544 | break; |
545 | default: | |
2f972202 | 546 | ret = -EINVAL; |
1da177e4 | 547 | } |
2f972202 | 548 | out: |
1da177e4 LT |
549 | if (cdev->drv) |
550 | module_put(cdev->drv->owner); | |
551 | atomic_set(&cdev->private->onoff, 0); | |
e74fe0ce | 552 | return (ret < 0) ? ret : count; |
1da177e4 LT |
553 | } |
554 | ||
555 | static ssize_t | |
3fd3c0a5 | 556 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
557 | { |
558 | struct ccw_device *cdev = to_ccwdev(dev); | |
559 | struct subchannel *sch; | |
560 | ||
d7b5a4c9 CH |
561 | if (ccw_device_is_orphan(cdev)) |
562 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
563 | switch (cdev->private->state) { |
564 | case DEV_STATE_BOXED: | |
565 | return sprintf(buf, "boxed\n"); | |
566 | case DEV_STATE_DISCONNECTED: | |
567 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
568 | case DEV_STATE_NOT_OPER: | |
569 | sch = to_subchannel(dev->parent); | |
570 | if (!sch->lpm) | |
571 | return sprintf(buf, "no path\n"); | |
572 | else | |
573 | return sprintf(buf, "no device\n"); | |
574 | default: | |
575 | /* All other states considered fine. */ | |
576 | return sprintf(buf, "good\n"); | |
577 | } | |
578 | } | |
579 | ||
580 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
581 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
582 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
583 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 584 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 585 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
586 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
587 | ||
7e9db9ea | 588 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
589 | &dev_attr_chpids.attr, |
590 | &dev_attr_pimpampom.attr, | |
591 | NULL, | |
592 | }; | |
593 | ||
7e9db9ea CH |
594 | static struct attribute_group io_subchannel_attr_group = { |
595 | .attrs = io_subchannel_attrs, | |
529192f3 | 596 | }; |
1da177e4 LT |
597 | |
598 | static struct attribute * ccwdev_attrs[] = { | |
599 | &dev_attr_devtype.attr, | |
600 | &dev_attr_cutype.attr, | |
f1fc78a8 | 601 | &dev_attr_modalias.attr, |
1da177e4 LT |
602 | &dev_attr_online.attr, |
603 | &dev_attr_cmb_enable.attr, | |
604 | &dev_attr_availability.attr, | |
605 | NULL, | |
606 | }; | |
607 | ||
608 | static struct attribute_group ccwdev_attr_group = { | |
609 | .attrs = ccwdev_attrs, | |
610 | }; | |
611 | ||
a4dbd674 | 612 | static const struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
613 | &ccwdev_attr_group, |
614 | NULL, | |
615 | }; | |
1da177e4 LT |
616 | |
617 | /* this is a simple abstraction for device_register that sets the | |
618 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 619 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
620 | { |
621 | struct device *dev = &cdev->dev; | |
622 | int ret; | |
623 | ||
624 | dev->bus = &ccw_bus_type; | |
3ac276f8 SO |
625 | ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, |
626 | cdev->private->dev_id.devno); | |
627 | if (ret) | |
628 | return ret; | |
629 | ret = device_add(dev); | |
630 | if (ret) | |
1da177e4 LT |
631 | return ret; |
632 | ||
633 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
634 | return ret; |
635 | } | |
636 | ||
5d6e6b6f | 637 | static int match_dev_id(struct device *dev, void *data) |
b0744bd2 | 638 | { |
5d6e6b6f PO |
639 | struct ccw_device *cdev = to_ccwdev(dev); |
640 | struct ccw_dev_id *dev_id = data; | |
d7b5a4c9 | 641 | |
d7b5a4c9 CH |
642 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); |
643 | } | |
644 | ||
5d6e6b6f | 645 | static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) |
d7b5a4c9 CH |
646 | { |
647 | struct device *dev; | |
648 | ||
5d6e6b6f | 649 | dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); |
d7b5a4c9 CH |
650 | |
651 | return dev ? to_ccwdev(dev) : NULL; | |
652 | } | |
653 | ||
37de53bb | 654 | static void ccw_device_do_unbind_bind(struct ccw_device *cdev) |
1da177e4 | 655 | { |
eb32ae8d | 656 | int ret; |
1da177e4 | 657 | |
eb32ae8d CH |
658 | if (test_bit(1, &cdev->private->registered)) { |
659 | device_release_driver(&cdev->dev); | |
660 | ret = device_attach(&cdev->dev); | |
661 | WARN_ON(ret == -ENODEV); | |
662 | } | |
1da177e4 LT |
663 | } |
664 | ||
665 | static void | |
666 | ccw_device_release(struct device *dev) | |
667 | { | |
668 | struct ccw_device *cdev; | |
669 | ||
670 | cdev = to_ccwdev(dev); | |
6eff208f CH |
671 | /* Release reference of parent subchannel. */ |
672 | put_device(cdev->dev.parent); | |
1da177e4 LT |
673 | kfree(cdev->private); |
674 | kfree(cdev); | |
675 | } | |
676 | ||
7674da77 CH |
677 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
678 | { | |
679 | struct ccw_device *cdev; | |
680 | ||
681 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
682 | if (cdev) { | |
683 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
684 | GFP_KERNEL | GFP_DMA); | |
685 | if (cdev->private) | |
686 | return cdev; | |
687 | } | |
688 | kfree(cdev); | |
689 | return ERR_PTR(-ENOMEM); | |
690 | } | |
691 | ||
37de53bb PO |
692 | static void ccw_device_todo(struct work_struct *work); |
693 | ||
7674da77 CH |
694 | static int io_subchannel_initialize_dev(struct subchannel *sch, |
695 | struct ccw_device *cdev) | |
696 | { | |
697 | cdev->private->cdev = cdev; | |
698 | atomic_set(&cdev->private->onoff, 0); | |
699 | cdev->dev.parent = &sch->dev; | |
700 | cdev->dev.release = ccw_device_release; | |
37de53bb | 701 | INIT_WORK(&cdev->private->todo_work, ccw_device_todo); |
ef99516c | 702 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
703 | /* Do first half of device_register. */ |
704 | device_initialize(&cdev->dev); | |
705 | if (!get_device(&sch->dev)) { | |
283fdd0b CH |
706 | /* Release reference from device_initialize(). */ |
707 | put_device(&cdev->dev); | |
7674da77 CH |
708 | return -ENODEV; |
709 | } | |
710 | return 0; | |
711 | } | |
712 | ||
713 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
714 | { | |
715 | struct ccw_device *cdev; | |
716 | int ret; | |
717 | ||
718 | cdev = io_subchannel_allocate_dev(sch); | |
719 | if (!IS_ERR(cdev)) { | |
720 | ret = io_subchannel_initialize_dev(sch, cdev); | |
06739a8a | 721 | if (ret) |
7674da77 | 722 | cdev = ERR_PTR(ret); |
7674da77 CH |
723 | } |
724 | return cdev; | |
725 | } | |
726 | ||
d7b5a4c9 CH |
727 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
728 | ||
d7b5a4c9 CH |
729 | static void sch_create_and_recog_new_device(struct subchannel *sch) |
730 | { | |
731 | struct ccw_device *cdev; | |
732 | ||
733 | /* Need to allocate a new ccw device. */ | |
734 | cdev = io_subchannel_create_ccwdev(sch); | |
735 | if (IS_ERR(cdev)) { | |
736 | /* OK, we did everything we could... */ | |
737 | css_sch_device_unregister(sch); | |
738 | return; | |
739 | } | |
d7b5a4c9 CH |
740 | /* Start recognition for the new ccw device. */ |
741 | if (io_subchannel_recog(cdev, sch)) { | |
742 | spin_lock_irq(sch->lock); | |
db6a6423 | 743 | sch_set_cdev(sch, NULL); |
d7b5a4c9 | 744 | spin_unlock_irq(sch->lock); |
d7b5a4c9 | 745 | css_sch_device_unregister(sch); |
6eff208f CH |
746 | /* Put reference from io_subchannel_create_ccwdev(). */ |
747 | put_device(&sch->dev); | |
748 | /* Give up initial reference. */ | |
749 | put_device(&cdev->dev); | |
d7b5a4c9 CH |
750 | } |
751 | } | |
752 | ||
1da177e4 LT |
753 | /* |
754 | * Register recognized device. | |
755 | */ | |
37de53bb | 756 | static void io_subchannel_register(struct ccw_device *cdev) |
1da177e4 | 757 | { |
1da177e4 LT |
758 | struct subchannel *sch; |
759 | int ret; | |
760 | unsigned long flags; | |
761 | ||
1da177e4 | 762 | sch = to_subchannel(cdev->dev.parent); |
5fb6b854 CH |
763 | /* |
764 | * Check if subchannel is still registered. It may have become | |
765 | * unregistered if a machine check hit us after finishing | |
766 | * device recognition but before the register work could be | |
767 | * queued. | |
768 | */ | |
769 | if (!device_is_registered(&sch->dev)) | |
770 | goto out_err; | |
82b7ac05 | 771 | css_update_ssd_info(sch); |
47af5518 CH |
772 | /* |
773 | * io_subchannel_register() will also be called after device | |
774 | * recognition has been done for a boxed device (which will already | |
775 | * be registered). We need to reprobe since we may now have sense id | |
776 | * information. | |
777 | */ | |
d6a30761 | 778 | if (device_is_registered(&cdev->dev)) { |
47af5518 CH |
779 | if (!cdev->drv) { |
780 | ret = device_reprobe(&cdev->dev); | |
781 | if (ret) | |
782 | /* We can't do much here. */ | |
139b83dd | 783 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
784 | " %d for 0.%x.%04x\n", ret, |
785 | cdev->private->dev_id.ssid, | |
786 | cdev->private->dev_id.devno); | |
47af5518 | 787 | } |
1da177e4 LT |
788 | goto out; |
789 | } | |
fa1a8c23 CH |
790 | /* |
791 | * Now we know this subchannel will stay, we can throw | |
792 | * our delayed uevent. | |
793 | */ | |
f67f129e | 794 | dev_set_uevent_suppress(&sch->dev, 0); |
fa1a8c23 | 795 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
1da177e4 LT |
796 | /* make it known to the system */ |
797 | ret = ccw_device_register(cdev); | |
798 | if (ret) { | |
e556bbbd CH |
799 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
800 | cdev->private->dev_id.ssid, | |
801 | cdev->private->dev_id.devno, ret); | |
2ec22984 | 802 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 803 | sch_set_cdev(sch, NULL); |
2ec22984 | 804 | spin_unlock_irqrestore(sch->lock, flags); |
6eff208f CH |
805 | /* Release initial device reference. */ |
806 | put_device(&cdev->dev); | |
5fb6b854 | 807 | goto out_err; |
1da177e4 | 808 | } |
1da177e4 LT |
809 | out: |
810 | cdev->private->flags.recog_done = 1; | |
1da177e4 | 811 | wake_up(&cdev->private->wait_q); |
5fb6b854 | 812 | out_err: |
1da177e4 LT |
813 | if (atomic_dec_and_test(&ccw_device_init_count)) |
814 | wake_up(&ccw_device_init_wq); | |
815 | } | |
816 | ||
37de53bb | 817 | static void ccw_device_call_sch_unregister(struct ccw_device *cdev) |
1da177e4 | 818 | { |
1da177e4 LT |
819 | struct subchannel *sch; |
820 | ||
46fbe4e4 PO |
821 | /* Get subchannel reference for local processing. */ |
822 | if (!get_device(cdev->dev.parent)) | |
823 | return; | |
1da177e4 | 824 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 825 | css_sch_device_unregister(sch); |
46fbe4e4 | 826 | /* Release subchannel reference for local processing. */ |
1da177e4 LT |
827 | put_device(&sch->dev); |
828 | } | |
829 | ||
830 | /* | |
831 | * subchannel recognition done. Called from the state machine. | |
832 | */ | |
833 | void | |
834 | io_subchannel_recog_done(struct ccw_device *cdev) | |
835 | { | |
1da177e4 LT |
836 | if (css_init_done == 0) { |
837 | cdev->private->flags.recog_done = 1; | |
838 | return; | |
839 | } | |
840 | switch (cdev->private->state) { | |
47593bfa SO |
841 | case DEV_STATE_BOXED: |
842 | /* Device did not respond in time. */ | |
1da177e4 LT |
843 | case DEV_STATE_NOT_OPER: |
844 | cdev->private->flags.recog_done = 1; | |
37de53bb PO |
845 | /* Remove device found not operational. */ |
846 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1da177e4 LT |
847 | if (atomic_dec_and_test(&ccw_device_init_count)) |
848 | wake_up(&ccw_device_init_wq); | |
849 | break; | |
1da177e4 LT |
850 | case DEV_STATE_OFFLINE: |
851 | /* | |
852 | * We can't register the device in interrupt context so | |
853 | * we schedule a work item. | |
854 | */ | |
37de53bb | 855 | ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); |
1da177e4 LT |
856 | break; |
857 | } | |
858 | } | |
859 | ||
860 | static int | |
861 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
862 | { | |
863 | int rc; | |
864 | struct ccw_device_private *priv; | |
865 | ||
2ec22984 | 866 | cdev->ccwlock = sch->lock; |
fb6958a5 | 867 | |
1da177e4 LT |
868 | /* Init private data. */ |
869 | priv = cdev->private; | |
78964268 CH |
870 | priv->dev_id.devno = sch->schib.pmcw.dev; |
871 | priv->dev_id.ssid = sch->schid.ssid; | |
872 | priv->schid = sch->schid; | |
1da177e4 LT |
873 | priv->state = DEV_STATE_NOT_OPER; |
874 | INIT_LIST_HEAD(&priv->cmb_list); | |
875 | init_waitqueue_head(&priv->wait_q); | |
876 | init_timer(&priv->timer); | |
877 | ||
1da177e4 LT |
878 | /* Increase counter of devices currently in recognition. */ |
879 | atomic_inc(&ccw_device_init_count); | |
880 | ||
881 | /* Start async. device sensing. */ | |
2ec22984 | 882 | spin_lock_irq(sch->lock); |
60e4dac1 | 883 | sch_set_cdev(sch, cdev); |
1da177e4 | 884 | rc = ccw_device_recognition(cdev); |
2ec22984 | 885 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
886 | if (rc) { |
887 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
888 | wake_up(&ccw_device_init_wq); | |
889 | } | |
890 | return rc; | |
891 | } | |
892 | ||
5d6e6b6f PO |
893 | static int ccw_device_move_to_sch(struct ccw_device *cdev, |
894 | struct subchannel *sch) | |
d7b5a4c9 | 895 | { |
5d6e6b6f | 896 | struct subchannel *old_sch; |
d7b5a4c9 | 897 | int rc; |
d7b5a4c9 | 898 | |
5d6e6b6f PO |
899 | old_sch = to_subchannel(cdev->dev.parent); |
900 | /* Obtain child reference for new parent. */ | |
6eff208f | 901 | if (!get_device(&sch->dev)) |
5d6e6b6f | 902 | return -ENODEV; |
d7b5a4c9 | 903 | mutex_lock(&sch->reg_mutex); |
ffa6a705 | 904 | rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); |
d7b5a4c9 CH |
905 | mutex_unlock(&sch->reg_mutex); |
906 | if (rc) { | |
5d6e6b6f | 907 | CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", |
d7b5a4c9 CH |
908 | cdev->private->dev_id.ssid, |
909 | cdev->private->dev_id.devno, sch->schid.ssid, | |
5d6e6b6f PO |
910 | sch->schib.pmcw.dev, rc); |
911 | /* Release child reference for new parent. */ | |
6eff208f | 912 | put_device(&sch->dev); |
5d6e6b6f | 913 | return rc; |
d7b5a4c9 | 914 | } |
5d6e6b6f PO |
915 | /* Clean up old subchannel. */ |
916 | if (!sch_is_pseudo_sch(old_sch)) { | |
917 | spin_lock_irq(old_sch->lock); | |
918 | sch_set_cdev(old_sch, NULL); | |
919 | cio_disable_subchannel(old_sch); | |
920 | spin_unlock_irq(old_sch->lock); | |
921 | css_schedule_eval(old_sch->schid); | |
d7b5a4c9 | 922 | } |
5d6e6b6f PO |
923 | /* Release child reference for old parent. */ |
924 | put_device(&old_sch->dev); | |
925 | /* Initialize new subchannel. */ | |
926 | spin_lock_irq(sch->lock); | |
927 | cdev->private->schid = sch->schid; | |
928 | cdev->ccwlock = sch->lock; | |
929 | if (!sch_is_pseudo_sch(sch)) | |
930 | sch_set_cdev(sch, cdev); | |
931 | spin_unlock_irq(sch->lock); | |
932 | if (!sch_is_pseudo_sch(sch)) | |
933 | css_update_ssd_info(sch); | |
934 | return 0; | |
935 | } | |
936 | ||
937 | static int ccw_device_move_to_orph(struct ccw_device *cdev) | |
938 | { | |
939 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
940 | struct channel_subsystem *css = to_css(sch->dev.parent); | |
941 | ||
942 | return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); | |
d7b5a4c9 CH |
943 | } |
944 | ||
602b20f2 CH |
945 | static void io_subchannel_irq(struct subchannel *sch) |
946 | { | |
947 | struct ccw_device *cdev; | |
948 | ||
db6a6423 | 949 | cdev = sch_get_cdev(sch); |
602b20f2 | 950 | |
efd986db SO |
951 | CIO_TRACE_EVENT(6, "IRQ"); |
952 | CIO_TRACE_EVENT(6, dev_name(&sch->dev)); | |
602b20f2 CH |
953 | if (cdev) |
954 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
955 | } | |
956 | ||
13952ec1 SO |
957 | void io_subchannel_init_config(struct subchannel *sch) |
958 | { | |
959 | memset(&sch->config, 0, sizeof(sch->config)); | |
960 | sch->config.csense = 1; | |
d36f0c66 SO |
961 | /* Use subchannel mp mode when there is more than 1 installed CHPID. */ |
962 | if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0) | |
13952ec1 SO |
963 | sch->config.mp = 1; |
964 | } | |
965 | ||
0ae7a7b2 CH |
966 | static void io_subchannel_init_fields(struct subchannel *sch) |
967 | { | |
968 | if (cio_is_console(sch->schid)) | |
969 | sch->opm = 0xff; | |
970 | else | |
971 | sch->opm = chp_get_sch_opm(sch); | |
972 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 973 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
974 | |
975 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
976 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
977 | sch->schib.pmcw.dev, sch->schid.ssid, | |
978 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
979 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
13952ec1 SO |
980 | |
981 | io_subchannel_init_config(sch); | |
0ae7a7b2 CH |
982 | } |
983 | ||
90ed2b69 CH |
984 | /* |
985 | * Note: We always return 0 so that we bind to the device even on error. | |
986 | * This is needed so that our remove function is called on unregister. | |
987 | */ | |
0ae7a7b2 | 988 | static int io_subchannel_probe(struct subchannel *sch) |
1da177e4 | 989 | { |
1da177e4 LT |
990 | struct ccw_device *cdev; |
991 | int rc; | |
1da177e4 | 992 | |
6d7c5afc | 993 | if (cio_is_console(sch->schid)) { |
7e9db9ea CH |
994 | rc = sysfs_create_group(&sch->dev.kobj, |
995 | &io_subchannel_attr_group); | |
996 | if (rc) | |
997 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
998 | "attributes for subchannel " | |
999 | "0.%x.%04x (rc=%d)\n", | |
1000 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 | 1001 | /* |
6d7c5afc | 1002 | * The console subchannel already has an associated ccw_device. |
7e9db9ea | 1003 | * Throw the delayed uevent for the subchannel, register |
6d7c5afc | 1004 | * the ccw_device and exit. |
1da177e4 | 1005 | */ |
f67f129e | 1006 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea | 1007 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
6d7c5afc | 1008 | cdev = sch_get_cdev(sch); |
e1031786 | 1009 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1010 | device_initialize(&cdev->dev); |
1011 | ccw_device_register(cdev); | |
1da177e4 LT |
1012 | /* |
1013 | * Check if the device is already online. If it is | |
9cd67421 CH |
1014 | * the reference count needs to be corrected since we |
1015 | * didn't obtain a reference in ccw_device_set_online. | |
1da177e4 LT |
1016 | */ |
1017 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1018 | cdev->private->state != DEV_STATE_OFFLINE && | |
1019 | cdev->private->state != DEV_STATE_BOXED) | |
1020 | get_device(&cdev->dev); | |
1021 | return 0; | |
1022 | } | |
0ae7a7b2 | 1023 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1024 | rc = cio_commit_config(sch); |
1025 | if (rc) | |
1026 | goto out_schedule; | |
7e9db9ea CH |
1027 | rc = sysfs_create_group(&sch->dev.kobj, |
1028 | &io_subchannel_attr_group); | |
1029 | if (rc) | |
90ed2b69 | 1030 | goto out_schedule; |
cd6b4f27 CH |
1031 | /* Allocate I/O subchannel private data. */ |
1032 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1033 | GFP_KERNEL | GFP_DMA); | |
90ed2b69 | 1034 | if (!sch->private) |
48e4c385 | 1035 | goto out_schedule; |
5d6e6b6f | 1036 | css_schedule_eval(sch->schid); |
7e9db9ea | 1037 | return 0; |
48e4c385 | 1038 | |
90ed2b69 | 1039 | out_schedule: |
390935ac PO |
1040 | spin_lock_irq(sch->lock); |
1041 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | |
1042 | spin_unlock_irq(sch->lock); | |
90ed2b69 | 1043 | return 0; |
1da177e4 LT |
1044 | } |
1045 | ||
1da177e4 | 1046 | static int |
8bbace7e | 1047 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1048 | { |
1049 | struct ccw_device *cdev; | |
1050 | unsigned long flags; | |
1051 | ||
db6a6423 CH |
1052 | cdev = sch_get_cdev(sch); |
1053 | if (!cdev) | |
48e4c385 | 1054 | goto out_free; |
1da177e4 LT |
1055 | /* Set ccw device to not operational and drop reference. */ |
1056 | spin_lock_irqsave(cdev->ccwlock, flags); | |
db6a6423 | 1057 | sch_set_cdev(sch, NULL); |
1da177e4 LT |
1058 | cdev->private->state = DEV_STATE_NOT_OPER; |
1059 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c | 1060 | ccw_device_unregister(cdev); |
48e4c385 | 1061 | out_free: |
cd6b4f27 | 1062 | kfree(sch->private); |
7e9db9ea | 1063 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1064 | return 0; |
1065 | } | |
1066 | ||
602b20f2 | 1067 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1068 | { |
1069 | struct ccw_device *cdev; | |
1070 | ||
db6a6423 | 1071 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1072 | if (cdev) |
1073 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1074 | } | |
1075 | ||
c820de39 | 1076 | static int check_for_io_on_path(struct subchannel *sch, int mask) |
1da177e4 | 1077 | { |
cdb912a4 | 1078 | if (cio_update_schib(sch)) |
c820de39 | 1079 | return 0; |
23d805b6 | 1080 | if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask) |
c820de39 CH |
1081 | return 1; |
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | static void terminate_internal_io(struct subchannel *sch, | |
1086 | struct ccw_device *cdev) | |
1087 | { | |
1088 | if (cio_clear(sch)) { | |
1089 | /* Recheck device in case clear failed. */ | |
1090 | sch->lpm = 0; | |
1091 | if (cdev->online) | |
1092 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1093 | else | |
1094 | css_schedule_eval(sch->schid); | |
d23861ff | 1095 | return; |
c820de39 | 1096 | } |
1da177e4 | 1097 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
c820de39 CH |
1098 | /* Request retry of internal operation. */ |
1099 | cdev->private->flags.intretry = 1; | |
1100 | /* Call handler. */ | |
1da177e4 LT |
1101 | if (cdev->handler) |
1102 | cdev->handler(cdev, cdev->private->intparm, | |
1103 | ERR_PTR(-EIO)); | |
1104 | } | |
1105 | ||
c820de39 CH |
1106 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1107 | { | |
1108 | struct ccw_device *cdev; | |
1109 | ||
1110 | cdev = sch_get_cdev(sch); | |
1111 | if (!cdev) | |
1112 | return; | |
1113 | if (check_for_io_on_path(sch, mask)) { | |
1114 | if (cdev->private->state == DEV_STATE_ONLINE) | |
1115 | ccw_device_kill_io(cdev); | |
1116 | else { | |
1117 | terminate_internal_io(sch, cdev); | |
1118 | /* Re-start path verification. */ | |
1119 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1120 | } | |
1121 | } else | |
1122 | /* trigger path verification. */ | |
1123 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1124 | ||
1125 | } | |
1126 | ||
99611f87 CH |
1127 | static int io_subchannel_chp_event(struct subchannel *sch, |
1128 | struct chp_link *link, int event) | |
c820de39 CH |
1129 | { |
1130 | int mask; | |
c820de39 | 1131 | |
99611f87 | 1132 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1133 | if (!mask) |
1134 | return 0; | |
1135 | switch (event) { | |
1136 | case CHP_VARY_OFF: | |
1137 | sch->opm &= ~mask; | |
1138 | sch->lpm &= ~mask; | |
1139 | io_subchannel_terminate_path(sch, mask); | |
1140 | break; | |
1141 | case CHP_VARY_ON: | |
1142 | sch->opm |= mask; | |
1143 | sch->lpm |= mask; | |
1144 | io_subchannel_verify(sch); | |
1145 | break; | |
1146 | case CHP_OFFLINE: | |
cdb912a4 | 1147 | if (cio_update_schib(sch)) |
c820de39 CH |
1148 | return -ENODEV; |
1149 | io_subchannel_terminate_path(sch, mask); | |
1150 | break; | |
1151 | case CHP_ONLINE: | |
cdb912a4 SO |
1152 | if (cio_update_schib(sch)) |
1153 | return -ENODEV; | |
c820de39 CH |
1154 | sch->lpm |= mask & sch->opm; |
1155 | io_subchannel_verify(sch); | |
1156 | break; | |
1157 | } | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1da177e4 | 1161 | static void |
8bbace7e | 1162 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1163 | { |
1da177e4 LT |
1164 | struct ccw_device *cdev; |
1165 | int ret; | |
1166 | ||
db6a6423 | 1167 | cdev = sch_get_cdev(sch); |
1da177e4 | 1168 | |
a8237fc4 | 1169 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1170 | return; |
1171 | if (!sch->schib.pmcw.ena) | |
1172 | /* Nothing to do. */ | |
1173 | return; | |
1174 | ret = cio_disable_subchannel(sch); | |
1175 | if (ret != -EBUSY) | |
1176 | /* Subchannel is disabled, we're done. */ | |
1177 | return; | |
1178 | cdev->private->state = DEV_STATE_QUIESCE; | |
1179 | if (cdev->handler) | |
1180 | cdev->handler(cdev, cdev->private->intparm, | |
1181 | ERR_PTR(-EIO)); | |
1182 | ret = ccw_device_cancel_halt_clear(cdev); | |
1183 | if (ret == -EBUSY) { | |
1184 | ccw_device_set_timeout(cdev, HZ/10); | |
1185 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1186 | } | |
1187 | cio_disable_subchannel(sch); | |
1188 | } | |
1189 | ||
c820de39 CH |
1190 | static int device_is_disconnected(struct ccw_device *cdev) |
1191 | { | |
1192 | if (!cdev) | |
1193 | return 0; | |
1194 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1195 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1196 | } | |
1197 | ||
1198 | static int recovery_check(struct device *dev, void *data) | |
1199 | { | |
1200 | struct ccw_device *cdev = to_ccwdev(dev); | |
1201 | int *redo = data; | |
1202 | ||
1203 | spin_lock_irq(cdev->ccwlock); | |
1204 | switch (cdev->private->state) { | |
1205 | case DEV_STATE_DISCONNECTED: | |
1206 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1207 | cdev->private->dev_id.ssid, | |
1208 | cdev->private->dev_id.devno); | |
1209 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1210 | *redo = 1; | |
1211 | break; | |
1212 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1213 | *redo = 1; | |
1214 | break; | |
1215 | } | |
1216 | spin_unlock_irq(cdev->ccwlock); | |
1217 | ||
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | static void recovery_work_func(struct work_struct *unused) | |
1222 | { | |
1223 | int redo = 0; | |
1224 | ||
1225 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1226 | if (redo) { | |
1227 | spin_lock_irq(&recovery_lock); | |
1228 | if (!timer_pending(&recovery_timer)) { | |
1229 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1230 | recovery_phase++; | |
1231 | mod_timer(&recovery_timer, jiffies + | |
1232 | recovery_delay[recovery_phase] * HZ); | |
1233 | } | |
1234 | spin_unlock_irq(&recovery_lock); | |
1235 | } else | |
1236 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1237 | } | |
1238 | ||
1239 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1240 | ||
1241 | static void recovery_func(unsigned long data) | |
1242 | { | |
1243 | /* | |
1244 | * We can't do our recovery in softirq context and it's not | |
1245 | * performance critical, so we schedule it. | |
1246 | */ | |
1247 | schedule_work(&recovery_work); | |
1248 | } | |
1249 | ||
1250 | static void ccw_device_schedule_recovery(void) | |
1251 | { | |
1252 | unsigned long flags; | |
1253 | ||
1254 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1255 | spin_lock_irqsave(&recovery_lock, flags); | |
1256 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1257 | recovery_phase = 0; | |
1258 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1259 | } | |
1260 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1261 | } | |
1262 | ||
ecf5d9ef PO |
1263 | static int purge_fn(struct device *dev, void *data) |
1264 | { | |
1265 | struct ccw_device *cdev = to_ccwdev(dev); | |
37de53bb | 1266 | struct ccw_dev_id *id = &cdev->private->dev_id; |
ecf5d9ef PO |
1267 | |
1268 | spin_lock_irq(cdev->ccwlock); | |
37de53bb PO |
1269 | if (is_blacklisted(id->ssid, id->devno) && |
1270 | (cdev->private->state == DEV_STATE_OFFLINE)) { | |
1271 | CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, | |
1272 | id->devno); | |
1273 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); | |
1274 | } | |
ecf5d9ef | 1275 | spin_unlock_irq(cdev->ccwlock); |
ecf5d9ef PO |
1276 | /* Abort loop in case of pending signal. */ |
1277 | if (signal_pending(current)) | |
1278 | return -EINTR; | |
1279 | ||
1280 | return 0; | |
1281 | } | |
1282 | ||
1283 | /** | |
1284 | * ccw_purge_blacklisted - purge unused, blacklisted devices | |
1285 | * | |
1286 | * Unregister all ccw devices that are offline and on the blacklist. | |
1287 | */ | |
1288 | int ccw_purge_blacklisted(void) | |
1289 | { | |
1290 | CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); | |
1291 | bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); | |
1292 | return 0; | |
1293 | } | |
1294 | ||
6afcc775 | 1295 | void ccw_device_set_disconnected(struct ccw_device *cdev) |
c820de39 CH |
1296 | { |
1297 | if (!cdev) | |
1298 | return; | |
1299 | ccw_device_set_timeout(cdev, 0); | |
1300 | cdev->private->flags.fake_irb = 0; | |
1301 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1302 | if (cdev->online) | |
1303 | ccw_device_schedule_recovery(); | |
1304 | } | |
1305 | ||
91c36919 PO |
1306 | void ccw_device_set_notoper(struct ccw_device *cdev) |
1307 | { | |
1308 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1309 | ||
1310 | CIO_TRACE_EVENT(2, "notoper"); | |
b9d3aed7 | 1311 | CIO_TRACE_EVENT(2, dev_name(&sch->dev)); |
91c36919 PO |
1312 | ccw_device_set_timeout(cdev, 0); |
1313 | cio_disable_subchannel(sch); | |
1314 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1315 | } | |
1316 | ||
5d6e6b6f PO |
1317 | enum io_sch_action { |
1318 | IO_SCH_UNREG, | |
1319 | IO_SCH_ORPH_UNREG, | |
1320 | IO_SCH_ATTACH, | |
1321 | IO_SCH_UNREG_ATTACH, | |
1322 | IO_SCH_ORPH_ATTACH, | |
1323 | IO_SCH_REPROBE, | |
1324 | IO_SCH_VERIFY, | |
1325 | IO_SCH_DISC, | |
1326 | IO_SCH_NOP, | |
1327 | }; | |
1328 | ||
1329 | static enum io_sch_action sch_get_action(struct subchannel *sch) | |
1330 | { | |
1331 | struct ccw_device *cdev; | |
1332 | ||
1333 | cdev = sch_get_cdev(sch); | |
1334 | if (cio_update_schib(sch)) { | |
1335 | /* Not operational. */ | |
1336 | if (!cdev) | |
1337 | return IO_SCH_UNREG; | |
1338 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
1339 | return IO_SCH_UNREG; | |
1340 | return IO_SCH_ORPH_UNREG; | |
1341 | } | |
1342 | /* Operational. */ | |
1343 | if (!cdev) | |
1344 | return IO_SCH_ATTACH; | |
1345 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1346 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
1347 | return IO_SCH_UNREG_ATTACH; | |
1348 | return IO_SCH_ORPH_ATTACH; | |
1349 | } | |
1350 | if ((sch->schib.pmcw.pam & sch->opm) == 0) { | |
1351 | if (!ccw_device_notify(cdev, CIO_NO_PATH)) | |
1352 | return IO_SCH_UNREG; | |
1353 | return IO_SCH_DISC; | |
1354 | } | |
1355 | if (device_is_disconnected(cdev)) | |
1356 | return IO_SCH_REPROBE; | |
1357 | if (cdev->online) | |
1358 | return IO_SCH_VERIFY; | |
1359 | return IO_SCH_NOP; | |
1360 | } | |
1361 | ||
1362 | /** | |
1363 | * io_subchannel_sch_event - process subchannel event | |
1364 | * @sch: subchannel | |
1365 | * @process: non-zero if function is called in process context | |
1366 | * | |
1367 | * An unspecified event occurred for this subchannel. Adjust data according | |
1368 | * to the current operational state of the subchannel and device. Return | |
1369 | * zero when the event has been handled sufficiently or -EAGAIN when this | |
1370 | * function should be called again in process context. | |
1371 | */ | |
1372 | static int io_subchannel_sch_event(struct subchannel *sch, int process) | |
c820de39 | 1373 | { |
c820de39 | 1374 | unsigned long flags; |
c820de39 | 1375 | struct ccw_device *cdev; |
5d6e6b6f PO |
1376 | struct ccw_dev_id dev_id; |
1377 | enum io_sch_action action; | |
1378 | int rc = -EAGAIN; | |
c820de39 CH |
1379 | |
1380 | spin_lock_irqsave(sch->lock, flags); | |
5d6e6b6f PO |
1381 | if (!device_is_registered(&sch->dev)) |
1382 | goto out_unlock; | |
390935ac PO |
1383 | if (work_pending(&sch->todo_work)) |
1384 | goto out_unlock; | |
37de53bb PO |
1385 | cdev = sch_get_cdev(sch); |
1386 | if (cdev && work_pending(&cdev->private->todo_work)) | |
1387 | goto out_unlock; | |
5d6e6b6f PO |
1388 | action = sch_get_action(sch); |
1389 | CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", | |
1390 | sch->schid.ssid, sch->schid.sch_no, process, | |
1391 | action); | |
1392 | /* Perform immediate actions while holding the lock. */ | |
5d6e6b6f PO |
1393 | switch (action) { |
1394 | case IO_SCH_REPROBE: | |
1395 | /* Trigger device recognition. */ | |
1396 | ccw_device_trigger_reprobe(cdev); | |
1397 | rc = 0; | |
1398 | goto out_unlock; | |
1399 | case IO_SCH_VERIFY: | |
1400 | /* Trigger path verification. */ | |
1401 | io_subchannel_verify(sch); | |
1402 | rc = 0; | |
1403 | goto out_unlock; | |
1404 | case IO_SCH_DISC: | |
1405 | ccw_device_set_disconnected(cdev); | |
1406 | rc = 0; | |
1407 | goto out_unlock; | |
1408 | case IO_SCH_ORPH_UNREG: | |
1409 | case IO_SCH_ORPH_ATTACH: | |
1410 | ccw_device_set_disconnected(cdev); | |
1411 | break; | |
1412 | case IO_SCH_UNREG_ATTACH: | |
1413 | case IO_SCH_UNREG: | |
1414 | if (cdev) | |
1415 | ccw_device_set_notoper(cdev); | |
1416 | break; | |
1417 | case IO_SCH_NOP: | |
1418 | rc = 0; | |
1419 | goto out_unlock; | |
1420 | default: | |
1421 | break; | |
c820de39 | 1422 | } |
5d6e6b6f PO |
1423 | spin_unlock_irqrestore(sch->lock, flags); |
1424 | /* All other actions require process context. */ | |
1425 | if (!process) | |
1426 | goto out; | |
1427 | /* Handle attached ccw device. */ | |
1428 | switch (action) { | |
1429 | case IO_SCH_ORPH_UNREG: | |
1430 | case IO_SCH_ORPH_ATTACH: | |
1431 | /* Move ccw device to orphanage. */ | |
1432 | rc = ccw_device_move_to_orph(cdev); | |
1433 | if (rc) | |
1434 | goto out; | |
c820de39 | 1435 | break; |
5d6e6b6f PO |
1436 | case IO_SCH_UNREG_ATTACH: |
1437 | /* Unregister ccw device. */ | |
1438 | ccw_device_unregister(cdev); | |
c820de39 | 1439 | break; |
5d6e6b6f | 1440 | default: |
c820de39 CH |
1441 | break; |
1442 | } | |
5d6e6b6f | 1443 | /* Handle subchannel. */ |
c820de39 | 1444 | switch (action) { |
5d6e6b6f PO |
1445 | case IO_SCH_ORPH_UNREG: |
1446 | case IO_SCH_UNREG: | |
c820de39 | 1447 | css_sch_device_unregister(sch); |
c820de39 | 1448 | break; |
5d6e6b6f PO |
1449 | case IO_SCH_ORPH_ATTACH: |
1450 | case IO_SCH_UNREG_ATTACH: | |
1451 | case IO_SCH_ATTACH: | |
1452 | dev_id.ssid = sch->schid.ssid; | |
1453 | dev_id.devno = sch->schib.pmcw.dev; | |
1454 | cdev = get_ccwdev_by_dev_id(&dev_id); | |
1455 | if (!cdev) { | |
1456 | sch_create_and_recog_new_device(sch); | |
1457 | break; | |
1458 | } | |
1459 | rc = ccw_device_move_to_sch(cdev, sch); | |
1460 | if (rc) { | |
1461 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1462 | put_device(&cdev->dev); | |
1463 | goto out; | |
1464 | } | |
1465 | spin_lock_irqsave(sch->lock, flags); | |
c820de39 | 1466 | ccw_device_trigger_reprobe(cdev); |
5d6e6b6f PO |
1467 | spin_unlock_irqrestore(sch->lock, flags); |
1468 | /* Release reference from get_ccwdev_by_dev_id() */ | |
1469 | put_device(&cdev->dev); | |
91c36919 | 1470 | break; |
c820de39 CH |
1471 | default: |
1472 | break; | |
1473 | } | |
5d6e6b6f | 1474 | return 0; |
c820de39 | 1475 | |
5d6e6b6f PO |
1476 | out_unlock: |
1477 | spin_unlock_irqrestore(sch->lock, flags); | |
1478 | out: | |
1479 | return rc; | |
c820de39 CH |
1480 | } |
1481 | ||
1da177e4 LT |
1482 | #ifdef CONFIG_CCW_CONSOLE |
1483 | static struct ccw_device console_cdev; | |
1484 | static struct ccw_device_private console_private; | |
1485 | static int console_cdev_in_use; | |
1486 | ||
2ec22984 CH |
1487 | static DEFINE_SPINLOCK(ccw_console_lock); |
1488 | ||
1489 | spinlock_t * cio_get_console_lock(void) | |
1490 | { | |
1491 | return &ccw_console_lock; | |
1492 | } | |
1493 | ||
0ae7a7b2 CH |
1494 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1495 | struct subchannel *sch) | |
1da177e4 LT |
1496 | { |
1497 | int rc; | |
1498 | ||
cd6b4f27 CH |
1499 | /* Attach subchannel private data. */ |
1500 | sch->private = cio_get_console_priv(); | |
1501 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 | 1502 | io_subchannel_init_fields(sch); |
f444cc0e SO |
1503 | rc = cio_commit_config(sch); |
1504 | if (rc) | |
1505 | return rc; | |
0ae7a7b2 | 1506 | sch->driver = &io_subchannel_driver; |
1da177e4 | 1507 | /* Initialize the ccw_device structure. */ |
292888c8 | 1508 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1509 | rc = io_subchannel_recog(cdev, sch); |
1510 | if (rc) | |
1511 | return rc; | |
1512 | ||
1513 | /* Now wait for the async. recognition to come to an end. */ | |
1514 | spin_lock_irq(cdev->ccwlock); | |
1515 | while (!dev_fsm_final_state(cdev)) | |
1516 | wait_cons_dev(); | |
1517 | rc = -EIO; | |
1518 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1519 | goto out_unlock; | |
1520 | ccw_device_online(cdev); | |
1521 | while (!dev_fsm_final_state(cdev)) | |
1522 | wait_cons_dev(); | |
1523 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1524 | goto out_unlock; | |
1525 | rc = 0; | |
1526 | out_unlock: | |
1527 | spin_unlock_irq(cdev->ccwlock); | |
1528 | return 0; | |
1529 | } | |
1530 | ||
1531 | struct ccw_device * | |
1532 | ccw_device_probe_console(void) | |
1533 | { | |
1534 | struct subchannel *sch; | |
1535 | int ret; | |
1536 | ||
1537 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1538 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1539 | sch = cio_probe_console(); |
1540 | if (IS_ERR(sch)) { | |
1541 | console_cdev_in_use = 0; | |
1542 | return (void *) sch; | |
1543 | } | |
1544 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1545 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1546 | console_cdev.private = &console_private; | |
c1637532 | 1547 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1548 | ret = ccw_device_console_enable(&console_cdev, sch); |
1549 | if (ret) { | |
1550 | cio_release_console(); | |
1551 | console_cdev_in_use = 0; | |
1552 | return ERR_PTR(ret); | |
1553 | } | |
1554 | console_cdev.online = 1; | |
1555 | return &console_cdev; | |
1556 | } | |
1f4e7eda | 1557 | |
6664845c MS |
1558 | static int ccw_device_pm_restore(struct device *dev); |
1559 | ||
1560 | int ccw_device_force_console(void) | |
1561 | { | |
1562 | if (!console_cdev_in_use) | |
1563 | return -ENODEV; | |
1564 | return ccw_device_pm_restore(&console_cdev.dev); | |
1565 | } | |
1566 | EXPORT_SYMBOL_GPL(ccw_device_force_console); | |
1da177e4 LT |
1567 | #endif |
1568 | ||
1569 | /* | |
1570 | * get ccw_device matching the busid, but only if owned by cdrv | |
1571 | */ | |
b0744bd2 CH |
1572 | static int |
1573 | __ccwdev_check_busid(struct device *dev, void *id) | |
1574 | { | |
1575 | char *bus_id; | |
1576 | ||
12975aef | 1577 | bus_id = id; |
b0744bd2 | 1578 | |
98df67b3 | 1579 | return (strcmp(bus_id, dev_name(dev)) == 0); |
b0744bd2 CH |
1580 | } |
1581 | ||
1582 | ||
b2ffd8e9 CH |
1583 | /** |
1584 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1585 | * @cdrv: driver the device is owned by | |
1586 | * @bus_id: bus id of the device to be searched | |
1587 | * | |
1588 | * This function searches all devices owned by @cdrv for a device with a bus | |
1589 | * id matching @bus_id. | |
1590 | * Returns: | |
1591 | * If a match is found, its reference count of the found device is increased | |
1592 | * and it is returned; else %NULL is returned. | |
1593 | */ | |
1594 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1595 | const char *bus_id) | |
1da177e4 | 1596 | { |
b0744bd2 | 1597 | struct device *dev; |
1da177e4 LT |
1598 | struct device_driver *drv; |
1599 | ||
1600 | drv = get_driver(&cdrv->driver); | |
1601 | if (!drv) | |
b0744bd2 | 1602 | return NULL; |
1da177e4 | 1603 | |
b0744bd2 CH |
1604 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1605 | __ccwdev_check_busid); | |
1da177e4 LT |
1606 | put_driver(drv); |
1607 | ||
d2c993d8 | 1608 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1609 | } |
1610 | ||
1611 | /************************** device driver handling ************************/ | |
1612 | ||
1613 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1614 | * and release methods are initially very similar to the device_driver | |
1615 | * implementations, with the difference that they have ccw_device | |
1616 | * arguments. | |
1617 | * | |
1618 | * A ccw driver also contains the information that is needed for | |
1619 | * device matching. | |
1620 | */ | |
1621 | static int | |
1622 | ccw_device_probe (struct device *dev) | |
1623 | { | |
1624 | struct ccw_device *cdev = to_ccwdev(dev); | |
1625 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1626 | int ret; | |
1627 | ||
1628 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1629 | ||
1630 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1631 | ||
1632 | if (ret) { | |
d2c993d8 | 1633 | cdev->drv = NULL; |
1da177e4 LT |
1634 | return ret; |
1635 | } | |
1636 | ||
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | static int | |
1641 | ccw_device_remove (struct device *dev) | |
1642 | { | |
1643 | struct ccw_device *cdev = to_ccwdev(dev); | |
1644 | struct ccw_driver *cdrv = cdev->drv; | |
1645 | int ret; | |
1646 | ||
1da177e4 LT |
1647 | if (cdrv->remove) |
1648 | cdrv->remove(cdev); | |
1649 | if (cdev->online) { | |
1650 | cdev->online = 0; | |
1651 | spin_lock_irq(cdev->ccwlock); | |
1652 | ret = ccw_device_offline(cdev); | |
1653 | spin_unlock_irq(cdev->ccwlock); | |
1654 | if (ret == 0) | |
1655 | wait_event(cdev->private->wait_q, | |
1656 | dev_fsm_final_state(cdev)); | |
1657 | else | |
139b83dd | 1658 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1659 | "device 0.%x.%04x\n", |
1660 | ret, cdev->private->dev_id.ssid, | |
1661 | cdev->private->dev_id.devno); | |
9cd67421 CH |
1662 | /* Give up reference obtained in ccw_device_set_online(). */ |
1663 | put_device(&cdev->dev); | |
1da177e4 LT |
1664 | } |
1665 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1666 | cdev->drv = NULL; |
1da177e4 LT |
1667 | return 0; |
1668 | } | |
1669 | ||
958974fb CH |
1670 | static void ccw_device_shutdown(struct device *dev) |
1671 | { | |
1672 | struct ccw_device *cdev; | |
1673 | ||
1674 | cdev = to_ccwdev(dev); | |
1675 | if (cdev->drv && cdev->drv->shutdown) | |
1676 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1677 | disable_cmf(cdev); |
958974fb CH |
1678 | } |
1679 | ||
823d494a SO |
1680 | static int ccw_device_pm_prepare(struct device *dev) |
1681 | { | |
1682 | struct ccw_device *cdev = to_ccwdev(dev); | |
1683 | ||
37de53bb | 1684 | if (work_pending(&cdev->private->todo_work)) |
823d494a SO |
1685 | return -EAGAIN; |
1686 | /* Fail while device is being set online/offline. */ | |
1687 | if (atomic_read(&cdev->private->onoff)) | |
1688 | return -EAGAIN; | |
1689 | ||
1690 | if (cdev->online && cdev->drv && cdev->drv->prepare) | |
1691 | return cdev->drv->prepare(cdev); | |
1692 | ||
1693 | return 0; | |
1694 | } | |
1695 | ||
1696 | static void ccw_device_pm_complete(struct device *dev) | |
1697 | { | |
1698 | struct ccw_device *cdev = to_ccwdev(dev); | |
1699 | ||
1700 | if (cdev->online && cdev->drv && cdev->drv->complete) | |
1701 | cdev->drv->complete(cdev); | |
1702 | } | |
1703 | ||
1704 | static int ccw_device_pm_freeze(struct device *dev) | |
1705 | { | |
1706 | struct ccw_device *cdev = to_ccwdev(dev); | |
1707 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1708 | int ret, cm_enabled; | |
1709 | ||
1710 | /* Fail suspend while device is in transistional state. */ | |
1711 | if (!dev_fsm_final_state(cdev)) | |
1712 | return -EAGAIN; | |
1713 | if (!cdev->online) | |
1714 | return 0; | |
1715 | if (cdev->drv && cdev->drv->freeze) { | |
1716 | ret = cdev->drv->freeze(cdev); | |
1717 | if (ret) | |
1718 | return ret; | |
1719 | } | |
1720 | ||
1721 | spin_lock_irq(sch->lock); | |
1722 | cm_enabled = cdev->private->cmb != NULL; | |
1723 | spin_unlock_irq(sch->lock); | |
1724 | if (cm_enabled) { | |
1725 | /* Don't have the css write on memory. */ | |
1726 | ret = ccw_set_cmf(cdev, 0); | |
1727 | if (ret) | |
1728 | return ret; | |
1729 | } | |
1730 | /* From here on, disallow device driver I/O. */ | |
1731 | spin_lock_irq(sch->lock); | |
1732 | ret = cio_disable_subchannel(sch); | |
1733 | spin_unlock_irq(sch->lock); | |
1734 | ||
1735 | return ret; | |
1736 | } | |
1737 | ||
1738 | static int ccw_device_pm_thaw(struct device *dev) | |
1739 | { | |
1740 | struct ccw_device *cdev = to_ccwdev(dev); | |
1741 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1742 | int ret, cm_enabled; | |
1743 | ||
1744 | if (!cdev->online) | |
1745 | return 0; | |
1746 | ||
1747 | spin_lock_irq(sch->lock); | |
1748 | /* Allow device driver I/O again. */ | |
1749 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1750 | cm_enabled = cdev->private->cmb != NULL; | |
1751 | spin_unlock_irq(sch->lock); | |
1752 | if (ret) | |
1753 | return ret; | |
1754 | ||
1755 | if (cm_enabled) { | |
1756 | ret = ccw_set_cmf(cdev, 1); | |
1757 | if (ret) | |
1758 | return ret; | |
1759 | } | |
1760 | ||
1761 | if (cdev->drv && cdev->drv->thaw) | |
1762 | ret = cdev->drv->thaw(cdev); | |
1763 | ||
1764 | return ret; | |
1765 | } | |
1766 | ||
1767 | static void __ccw_device_pm_restore(struct ccw_device *cdev) | |
1768 | { | |
1769 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1770 | int ret; | |
1771 | ||
1772 | if (cio_is_console(sch->schid)) | |
1773 | goto out; | |
1774 | /* | |
1775 | * While we were sleeping, devices may have gone or become | |
1776 | * available again. Kick re-detection. | |
1777 | */ | |
1778 | spin_lock_irq(sch->lock); | |
1779 | cdev->private->flags.resuming = 1; | |
1780 | ret = ccw_device_recognition(cdev); | |
1781 | spin_unlock_irq(sch->lock); | |
1782 | if (ret) { | |
1783 | CIO_MSG_EVENT(0, "Couldn't start recognition for device " | |
f014824e SO |
1784 | "0.%x.%04x (ret=%d)\n", |
1785 | cdev->private->dev_id.ssid, | |
1786 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1787 | spin_lock_irq(sch->lock); |
1788 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1789 | spin_unlock_irq(sch->lock); | |
1790 | /* notify driver after the resume cb */ | |
1791 | goto out; | |
1792 | } | |
1793 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || | |
1794 | cdev->private->state == DEV_STATE_DISCONNECTED); | |
1795 | ||
1796 | out: | |
1797 | cdev->private->flags.resuming = 0; | |
1798 | } | |
1799 | ||
1800 | static int resume_handle_boxed(struct ccw_device *cdev) | |
1801 | { | |
1802 | cdev->private->state = DEV_STATE_BOXED; | |
1803 | if (ccw_device_notify(cdev, CIO_BOXED)) | |
1804 | return 0; | |
37de53bb | 1805 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1806 | return -ENODEV; |
1807 | } | |
1808 | ||
1809 | static int resume_handle_disc(struct ccw_device *cdev) | |
1810 | { | |
1811 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1812 | if (ccw_device_notify(cdev, CIO_GONE)) | |
1813 | return 0; | |
37de53bb | 1814 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
823d494a SO |
1815 | return -ENODEV; |
1816 | } | |
1817 | ||
1818 | static int ccw_device_pm_restore(struct device *dev) | |
1819 | { | |
1820 | struct ccw_device *cdev = to_ccwdev(dev); | |
1821 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
1822 | int ret = 0, cm_enabled; | |
1823 | ||
1824 | __ccw_device_pm_restore(cdev); | |
1825 | spin_lock_irq(sch->lock); | |
1826 | if (cio_is_console(sch->schid)) { | |
1827 | cio_enable_subchannel(sch, (u32)(addr_t)sch); | |
1828 | spin_unlock_irq(sch->lock); | |
1829 | goto out_restore; | |
1830 | } | |
1831 | cdev->private->flags.donotify = 0; | |
1832 | /* check recognition results */ | |
1833 | switch (cdev->private->state) { | |
1834 | case DEV_STATE_OFFLINE: | |
1835 | break; | |
1836 | case DEV_STATE_BOXED: | |
1837 | ret = resume_handle_boxed(cdev); | |
1838 | spin_unlock_irq(sch->lock); | |
1839 | if (ret) | |
1840 | goto out; | |
1841 | goto out_restore; | |
1842 | case DEV_STATE_DISCONNECTED: | |
1843 | goto out_disc_unlock; | |
1844 | default: | |
1845 | goto out_unreg_unlock; | |
1846 | } | |
1847 | /* check if the device id has changed */ | |
1848 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
f014824e SO |
1849 | CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno " |
1850 | "changed from %04x to %04x)\n", | |
1851 | sch->schid.ssid, sch->schid.sch_no, | |
823d494a SO |
1852 | cdev->private->dev_id.devno, |
1853 | sch->schib.pmcw.dev); | |
1854 | goto out_unreg_unlock; | |
1855 | } | |
1856 | /* check if the device type has changed */ | |
1857 | if (!ccw_device_test_sense_data(cdev)) { | |
1858 | ccw_device_update_sense_data(cdev); | |
37de53bb | 1859 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
823d494a SO |
1860 | ret = -ENODEV; |
1861 | goto out_unlock; | |
1862 | } | |
1863 | if (!cdev->online) { | |
1864 | ret = 0; | |
1865 | goto out_unlock; | |
1866 | } | |
1867 | ret = ccw_device_online(cdev); | |
1868 | if (ret) | |
1869 | goto out_disc_unlock; | |
1870 | ||
1871 | cm_enabled = cdev->private->cmb != NULL; | |
1872 | spin_unlock_irq(sch->lock); | |
1873 | ||
1874 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1875 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
1876 | spin_lock_irq(sch->lock); | |
1877 | goto out_disc_unlock; | |
1878 | } | |
1879 | if (cm_enabled) { | |
1880 | ret = ccw_set_cmf(cdev, 1); | |
1881 | if (ret) { | |
f014824e SO |
1882 | CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " |
1883 | "(rc=%d)\n", cdev->private->dev_id.ssid, | |
1884 | cdev->private->dev_id.devno, ret); | |
823d494a SO |
1885 | ret = 0; |
1886 | } | |
1887 | } | |
1888 | ||
1889 | out_restore: | |
1890 | if (cdev->online && cdev->drv && cdev->drv->restore) | |
1891 | ret = cdev->drv->restore(cdev); | |
1892 | out: | |
1893 | return ret; | |
1894 | ||
1895 | out_disc_unlock: | |
1896 | ret = resume_handle_disc(cdev); | |
1897 | spin_unlock_irq(sch->lock); | |
1898 | if (ret) | |
1899 | return ret; | |
1900 | goto out_restore; | |
1901 | ||
1902 | out_unreg_unlock: | |
37de53bb | 1903 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); |
823d494a SO |
1904 | ret = -ENODEV; |
1905 | out_unlock: | |
1906 | spin_unlock_irq(sch->lock); | |
1907 | return ret; | |
1908 | } | |
1909 | ||
1910 | static struct dev_pm_ops ccw_pm_ops = { | |
1911 | .prepare = ccw_device_pm_prepare, | |
1912 | .complete = ccw_device_pm_complete, | |
1913 | .freeze = ccw_device_pm_freeze, | |
1914 | .thaw = ccw_device_pm_thaw, | |
1915 | .restore = ccw_device_pm_restore, | |
1916 | }; | |
1917 | ||
8bbace7e CH |
1918 | struct bus_type ccw_bus_type = { |
1919 | .name = "ccw", | |
1920 | .match = ccw_bus_match, | |
1921 | .uevent = ccw_uevent, | |
1922 | .probe = ccw_device_probe, | |
1923 | .remove = ccw_device_remove, | |
958974fb | 1924 | .shutdown = ccw_device_shutdown, |
823d494a | 1925 | .pm = &ccw_pm_ops, |
8bbace7e CH |
1926 | }; |
1927 | ||
b2ffd8e9 CH |
1928 | /** |
1929 | * ccw_driver_register() - register a ccw driver | |
1930 | * @cdriver: driver to be registered | |
1931 | * | |
1932 | * This function is mainly a wrapper around driver_register(). | |
1933 | * Returns: | |
1934 | * %0 on success and a negative error value on failure. | |
1935 | */ | |
1936 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1937 | { |
1938 | struct device_driver *drv = &cdriver->driver; | |
1939 | ||
1940 | drv->bus = &ccw_bus_type; | |
1941 | drv->name = cdriver->name; | |
4beee646 | 1942 | drv->owner = cdriver->owner; |
1da177e4 LT |
1943 | |
1944 | return driver_register(drv); | |
1945 | } | |
1946 | ||
b2ffd8e9 CH |
1947 | /** |
1948 | * ccw_driver_unregister() - deregister a ccw driver | |
1949 | * @cdriver: driver to be deregistered | |
1950 | * | |
1951 | * This function is mainly a wrapper around driver_unregister(). | |
1952 | */ | |
1953 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1954 | { |
1955 | driver_unregister(&cdriver->driver); | |
1956 | } | |
1957 | ||
a8237fc4 CH |
1958 | /* Helper func for qdio. */ |
1959 | struct subchannel_id | |
1960 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1961 | { | |
1962 | struct subchannel *sch; | |
1963 | ||
1964 | sch = to_subchannel(cdev->dev.parent); | |
1965 | return sch->schid; | |
1966 | } | |
1967 | ||
37de53bb PO |
1968 | static void ccw_device_todo(struct work_struct *work) |
1969 | { | |
1970 | struct ccw_device_private *priv; | |
1971 | struct ccw_device *cdev; | |
1972 | struct subchannel *sch; | |
1973 | enum cdev_todo todo; | |
1974 | ||
1975 | priv = container_of(work, struct ccw_device_private, todo_work); | |
1976 | cdev = priv->cdev; | |
1977 | sch = to_subchannel(cdev->dev.parent); | |
1978 | /* Find out todo. */ | |
1979 | spin_lock_irq(cdev->ccwlock); | |
1980 | todo = priv->todo; | |
1981 | priv->todo = CDEV_TODO_NOTHING; | |
1982 | CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", | |
1983 | priv->dev_id.ssid, priv->dev_id.devno, todo); | |
1984 | spin_unlock_irq(cdev->ccwlock); | |
1985 | /* Perform todo. */ | |
1986 | switch (todo) { | |
1987 | case CDEV_TODO_ENABLE_CMF: | |
1988 | cmf_reenable(cdev); | |
1989 | break; | |
1990 | case CDEV_TODO_REBIND: | |
1991 | ccw_device_do_unbind_bind(cdev); | |
1992 | break; | |
1993 | case CDEV_TODO_REGISTER: | |
1994 | io_subchannel_register(cdev); | |
1995 | break; | |
1996 | case CDEV_TODO_UNREG_EVAL: | |
1997 | if (!sch_is_pseudo_sch(sch)) | |
1998 | css_schedule_eval(sch->schid); | |
1999 | /* fall-through */ | |
2000 | case CDEV_TODO_UNREG: | |
2001 | if (sch_is_pseudo_sch(sch)) | |
2002 | ccw_device_unregister(cdev); | |
2003 | else | |
2004 | ccw_device_call_sch_unregister(cdev); | |
2005 | break; | |
2006 | default: | |
2007 | break; | |
2008 | } | |
2009 | /* Release workqueue ref. */ | |
2010 | put_device(&cdev->dev); | |
2011 | } | |
2012 | ||
2013 | /** | |
2014 | * ccw_device_sched_todo - schedule ccw device operation | |
2015 | * @cdev: ccw device | |
2016 | * @todo: todo | |
2017 | * | |
2018 | * Schedule the operation identified by @todo to be performed on the slow path | |
2019 | * workqueue. Do nothing if another operation with higher priority is already | |
2020 | * scheduled. Needs to be called with ccwdev lock held. | |
2021 | */ | |
2022 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) | |
2023 | { | |
2024 | CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", | |
2025 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
2026 | todo); | |
2027 | if (cdev->private->todo >= todo) | |
2028 | return; | |
2029 | cdev->private->todo = todo; | |
2030 | /* Get workqueue ref. */ | |
2031 | if (!get_device(&cdev->dev)) | |
2032 | return; | |
2033 | if (!queue_work(slow_path_wq, &cdev->private->todo_work)) { | |
2034 | /* Already queued, release workqueue ref. */ | |
2035 | put_device(&cdev->dev); | |
2036 | } | |
2037 | } | |
2038 | ||
1da177e4 LT |
2039 | MODULE_LICENSE("GPL"); |
2040 | EXPORT_SYMBOL(ccw_device_set_online); | |
2041 | EXPORT_SYMBOL(ccw_device_set_offline); | |
2042 | EXPORT_SYMBOL(ccw_driver_register); | |
2043 | EXPORT_SYMBOL(ccw_driver_unregister); | |
2044 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
2045 | EXPORT_SYMBOL(ccw_bus_type); | |
2046 | EXPORT_SYMBOL(ccw_device_work); | |
a8237fc4 | 2047 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |