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" |
1da177e4 | 34 | |
90ab1336 | 35 | static struct timer_list recovery_timer; |
486d0a00 | 36 | static DEFINE_SPINLOCK(recovery_lock); |
90ab1336 PO |
37 | static int recovery_phase; |
38 | static const unsigned long recovery_delay[] = { 3, 30, 300 }; | |
39 | ||
1da177e4 LT |
40 | /******************* bus type handling ***********************/ |
41 | ||
42 | /* The Linux driver model distinguishes between a bus type and | |
43 | * the bus itself. Of course we only have one channel | |
44 | * subsystem driver and one channel system per machine, but | |
45 | * we still use the abstraction. T.R. says it's a good idea. */ | |
46 | static int | |
47 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
48 | { | |
49 | struct ccw_device *cdev = to_ccwdev(dev); | |
50 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
51 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
52 | ||
53 | if (!ids) | |
54 | return 0; | |
55 | ||
56 | found = ccw_device_id_match(ids, &cdev->id); | |
57 | if (!found) | |
58 | return 0; | |
59 | ||
60 | cdev->id.driver_info = found->driver_info; | |
61 | ||
62 | return 1; | |
63 | } | |
64 | ||
db0c2d59 PO |
65 | /* Store modalias string delimited by prefix/suffix string into buffer with |
66 | * specified size. Return length of resulting string (excluding trailing '\0') | |
67 | * even if string doesn't fit buffer (snprintf semantics). */ | |
cfbe9bb2 | 68 | static int snprint_alias(char *buf, size_t size, |
db0c2d59 | 69 | struct ccw_device_id *id, const char *suffix) |
1da177e4 | 70 | { |
db0c2d59 | 71 | int len; |
1da177e4 | 72 | |
cfbe9bb2 | 73 | len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); |
db0c2d59 PO |
74 | if (len > size) |
75 | return len; | |
76 | buf += len; | |
77 | size -= len; | |
1da177e4 | 78 | |
db0c2d59 PO |
79 | if (id->dev_type != 0) |
80 | len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, | |
81 | id->dev_model, suffix); | |
82 | else | |
83 | len += snprintf(buf, size, "dtdm%s", suffix); | |
1da177e4 | 84 | |
db0c2d59 PO |
85 | return len; |
86 | } | |
87 | ||
88 | /* Set up environment variables for ccw device uevent. Return 0 on success, | |
89 | * non-zero otherwise. */ | |
7eff2e7a | 90 | static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) |
db0c2d59 PO |
91 | { |
92 | struct ccw_device *cdev = to_ccwdev(dev); | |
93 | struct ccw_device_id *id = &(cdev->id); | |
cfbe9bb2 CH |
94 | int ret; |
95 | char modalias_buf[30]; | |
1da177e4 | 96 | |
db0c2d59 | 97 | /* CU_TYPE= */ |
7eff2e7a | 98 | ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); |
cfbe9bb2 CH |
99 | if (ret) |
100 | return ret; | |
db0c2d59 PO |
101 | |
102 | /* CU_MODEL= */ | |
7eff2e7a | 103 | ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); |
cfbe9bb2 CH |
104 | if (ret) |
105 | return ret; | |
1da177e4 LT |
106 | |
107 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 | 108 | /* DEV_TYPE= */ |
7eff2e7a | 109 | ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); |
cfbe9bb2 CH |
110 | if (ret) |
111 | return ret; | |
1da177e4 | 112 | |
db0c2d59 | 113 | /* DEV_MODEL= */ |
7eff2e7a | 114 | ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); |
cfbe9bb2 CH |
115 | if (ret) |
116 | return ret; | |
db0c2d59 PO |
117 | |
118 | /* MODALIAS= */ | |
cfbe9bb2 | 119 | snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); |
7eff2e7a KS |
120 | ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); |
121 | return ret; | |
1da177e4 LT |
122 | } |
123 | ||
8bbace7e | 124 | struct bus_type ccw_bus_type; |
1da177e4 | 125 | |
602b20f2 CH |
126 | static void io_subchannel_irq(struct subchannel *); |
127 | static int io_subchannel_probe(struct subchannel *); | |
128 | static int io_subchannel_remove(struct subchannel *); | |
8bbace7e | 129 | static void io_subchannel_shutdown(struct subchannel *); |
c820de39 | 130 | static int io_subchannel_sch_event(struct subchannel *, int); |
99611f87 CH |
131 | static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, |
132 | int); | |
1da177e4 | 133 | |
f08adc00 CH |
134 | static struct css_device_id io_subchannel_ids[] = { |
135 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, | |
136 | { /* end of list */ }, | |
137 | }; | |
138 | MODULE_DEVICE_TABLE(css, io_subchannel_ids); | |
139 | ||
f7e5d67c | 140 | static struct css_driver io_subchannel_driver = { |
4beee646 | 141 | .owner = THIS_MODULE, |
f08adc00 | 142 | .subchannel_type = io_subchannel_ids, |
25b7bb58 | 143 | .name = "io_subchannel", |
1da177e4 | 144 | .irq = io_subchannel_irq, |
c820de39 CH |
145 | .sch_event = io_subchannel_sch_event, |
146 | .chp_event = io_subchannel_chp_event, | |
8bbace7e CH |
147 | .probe = io_subchannel_probe, |
148 | .remove = io_subchannel_remove, | |
149 | .shutdown = io_subchannel_shutdown, | |
1da177e4 LT |
150 | }; |
151 | ||
152 | struct workqueue_struct *ccw_device_work; | |
153 | struct workqueue_struct *ccw_device_notify_work; | |
40154b82 PO |
154 | wait_queue_head_t ccw_device_init_wq; |
155 | atomic_t ccw_device_init_count; | |
1da177e4 | 156 | |
90ab1336 PO |
157 | static void recovery_func(unsigned long data); |
158 | ||
1da177e4 LT |
159 | static int __init |
160 | init_ccw_bus_type (void) | |
161 | { | |
162 | int ret; | |
163 | ||
164 | init_waitqueue_head(&ccw_device_init_wq); | |
165 | atomic_set(&ccw_device_init_count, 0); | |
90ab1336 | 166 | setup_timer(&recovery_timer, recovery_func, 0); |
1da177e4 LT |
167 | |
168 | ccw_device_work = create_singlethread_workqueue("cio"); | |
169 | if (!ccw_device_work) | |
170 | return -ENOMEM; /* FIXME: better errno ? */ | |
171 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); | |
172 | if (!ccw_device_notify_work) { | |
173 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
174 | goto out_err; | |
175 | } | |
176 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); | |
177 | if (!slow_path_wq) { | |
178 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
179 | goto out_err; | |
180 | } | |
181 | if ((ret = bus_register (&ccw_bus_type))) | |
182 | goto out_err; | |
183 | ||
25b7bb58 CH |
184 | ret = css_driver_register(&io_subchannel_driver); |
185 | if (ret) | |
1da177e4 LT |
186 | goto out_err; |
187 | ||
188 | wait_event(ccw_device_init_wq, | |
189 | atomic_read(&ccw_device_init_count) == 0); | |
190 | flush_workqueue(ccw_device_work); | |
191 | return 0; | |
192 | out_err: | |
193 | if (ccw_device_work) | |
194 | destroy_workqueue(ccw_device_work); | |
195 | if (ccw_device_notify_work) | |
196 | destroy_workqueue(ccw_device_notify_work); | |
197 | if (slow_path_wq) | |
198 | destroy_workqueue(slow_path_wq); | |
199 | return ret; | |
200 | } | |
201 | ||
202 | static void __exit | |
203 | cleanup_ccw_bus_type (void) | |
204 | { | |
25b7bb58 | 205 | css_driver_unregister(&io_subchannel_driver); |
1da177e4 LT |
206 | bus_unregister(&ccw_bus_type); |
207 | destroy_workqueue(ccw_device_notify_work); | |
208 | destroy_workqueue(ccw_device_work); | |
209 | } | |
210 | ||
211 | subsys_initcall(init_ccw_bus_type); | |
212 | module_exit(cleanup_ccw_bus_type); | |
213 | ||
214 | /************************ device handling **************************/ | |
215 | ||
216 | /* | |
217 | * A ccw_device has some interfaces in sysfs in addition to the | |
218 | * standard ones. | |
219 | * The following entries are designed to export the information which | |
220 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
221 | * are obvious, so they don't have an entry :) | |
222 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
223 | */ | |
224 | static ssize_t | |
3fd3c0a5 | 225 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
226 | { |
227 | struct subchannel *sch = to_subchannel(dev); | |
7ad6a249 | 228 | struct chsc_ssd_info *ssd = &sch->ssd_info; |
1da177e4 LT |
229 | ssize_t ret = 0; |
230 | int chp; | |
7ad6a249 PO |
231 | int mask; |
232 | ||
233 | for (chp = 0; chp < 8; chp++) { | |
234 | mask = 0x80 >> chp; | |
235 | if (ssd->path_mask & mask) | |
236 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
237 | else | |
238 | ret += sprintf(buf + ret, "00 "); | |
239 | } | |
1da177e4 LT |
240 | ret += sprintf (buf+ret, "\n"); |
241 | return min((ssize_t)PAGE_SIZE, ret); | |
242 | } | |
243 | ||
244 | static ssize_t | |
3fd3c0a5 | 245 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
246 | { |
247 | struct subchannel *sch = to_subchannel(dev); | |
248 | struct pmcw *pmcw = &sch->schib.pmcw; | |
249 | ||
250 | return sprintf (buf, "%02x %02x %02x\n", | |
251 | pmcw->pim, pmcw->pam, pmcw->pom); | |
252 | } | |
253 | ||
254 | static ssize_t | |
3fd3c0a5 | 255 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
256 | { |
257 | struct ccw_device *cdev = to_ccwdev(dev); | |
258 | struct ccw_device_id *id = &(cdev->id); | |
259 | ||
260 | if (id->dev_type != 0) | |
261 | return sprintf(buf, "%04x/%02x\n", | |
262 | id->dev_type, id->dev_model); | |
263 | else | |
264 | return sprintf(buf, "n/a\n"); | |
265 | } | |
266 | ||
267 | static ssize_t | |
3fd3c0a5 | 268 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
269 | { |
270 | struct ccw_device *cdev = to_ccwdev(dev); | |
271 | struct ccw_device_id *id = &(cdev->id); | |
272 | ||
273 | return sprintf(buf, "%04x/%02x\n", | |
274 | id->cu_type, id->cu_model); | |
275 | } | |
276 | ||
f1fc78a8 BB |
277 | static ssize_t |
278 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
279 | { | |
280 | struct ccw_device *cdev = to_ccwdev(dev); | |
281 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 282 | int len; |
f1fc78a8 | 283 | |
086a6c62 | 284 | len = snprint_alias(buf, PAGE_SIZE, id, "\n"); |
db0c2d59 PO |
285 | |
286 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
287 | } |
288 | ||
1da177e4 | 289 | static ssize_t |
3fd3c0a5 | 290 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
291 | { |
292 | struct ccw_device *cdev = to_ccwdev(dev); | |
293 | ||
294 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
295 | } | |
296 | ||
d7b5a4c9 CH |
297 | int ccw_device_is_orphan(struct ccw_device *cdev) |
298 | { | |
299 | return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); | |
300 | } | |
301 | ||
ef99516c | 302 | static void ccw_device_unregister(struct ccw_device *cdev) |
7674da77 | 303 | { |
7674da77 | 304 | if (test_and_clear_bit(1, &cdev->private->registered)) |
ef99516c | 305 | device_del(&cdev->dev); |
7674da77 CH |
306 | } |
307 | ||
59a8a6e2 CH |
308 | static void ccw_device_remove_orphan_cb(struct device *dev) |
309 | { | |
310 | struct ccw_device *cdev = to_ccwdev(dev); | |
311 | ||
312 | ccw_device_unregister(cdev); | |
313 | put_device(&cdev->dev); | |
314 | } | |
315 | ||
316 | static void ccw_device_remove_sch_cb(struct device *dev) | |
317 | { | |
318 | struct subchannel *sch; | |
319 | ||
320 | sch = to_subchannel(dev); | |
321 | css_sch_device_unregister(sch); | |
322 | /* Reset intparm to zeroes. */ | |
323 | sch->schib.pmcw.intparm = 0; | |
324 | cio_modify(sch); | |
325 | put_device(&sch->dev); | |
326 | } | |
327 | ||
1da177e4 LT |
328 | static void |
329 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
330 | { | |
d7b5a4c9 | 331 | unsigned long flags; |
59a8a6e2 CH |
332 | int rc; |
333 | ||
1da177e4 LT |
334 | /* |
335 | * Forced offline in disconnected state means | |
336 | * 'throw away device'. | |
337 | */ | |
d7b5a4c9 | 338 | if (ccw_device_is_orphan(cdev)) { |
59a8a6e2 CH |
339 | /* |
340 | * Deregister ccw device. | |
341 | * Unfortunately, we cannot do this directly from the | |
342 | * attribute method. | |
343 | */ | |
d7b5a4c9 CH |
344 | spin_lock_irqsave(cdev->ccwlock, flags); |
345 | cdev->private->state = DEV_STATE_NOT_OPER; | |
346 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
59a8a6e2 CH |
347 | rc = device_schedule_callback(&cdev->dev, |
348 | ccw_device_remove_orphan_cb); | |
349 | if (rc) | |
139b83dd | 350 | CIO_MSG_EVENT(0, "Couldn't unregister orphan " |
e556bbbd CH |
351 | "0.%x.%04x\n", |
352 | cdev->private->dev_id.ssid, | |
353 | cdev->private->dev_id.devno); | |
59a8a6e2 | 354 | return; |
d7b5a4c9 | 355 | } |
59a8a6e2 CH |
356 | /* Deregister subchannel, which will kill the ccw device. */ |
357 | rc = device_schedule_callback(cdev->dev.parent, | |
358 | ccw_device_remove_sch_cb); | |
359 | if (rc) | |
139b83dd | 360 | CIO_MSG_EVENT(0, "Couldn't unregister disconnected device " |
e556bbbd CH |
361 | "0.%x.%04x\n", |
362 | cdev->private->dev_id.ssid, | |
363 | cdev->private->dev_id.devno); | |
1da177e4 LT |
364 | } |
365 | ||
b2ffd8e9 CH |
366 | /** |
367 | * ccw_device_set_offline() - disable a ccw device for I/O | |
368 | * @cdev: target ccw device | |
369 | * | |
370 | * This function calls the driver's set_offline() function for @cdev, if | |
371 | * given, and then disables @cdev. | |
372 | * Returns: | |
373 | * %0 on success and a negative error value on failure. | |
374 | * Context: | |
375 | * enabled, ccw device lock not held | |
376 | */ | |
377 | int ccw_device_set_offline(struct ccw_device *cdev) | |
1da177e4 LT |
378 | { |
379 | int ret; | |
380 | ||
381 | if (!cdev) | |
382 | return -ENODEV; | |
383 | if (!cdev->online || !cdev->drv) | |
384 | return -EINVAL; | |
385 | ||
386 | if (cdev->drv->set_offline) { | |
387 | ret = cdev->drv->set_offline(cdev); | |
388 | if (ret != 0) | |
389 | return ret; | |
390 | } | |
391 | cdev->online = 0; | |
392 | spin_lock_irq(cdev->ccwlock); | |
393 | ret = ccw_device_offline(cdev); | |
394 | if (ret == -ENODEV) { | |
395 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
396 | cdev->private->state = DEV_STATE_OFFLINE; | |
397 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
398 | } | |
399 | spin_unlock_irq(cdev->ccwlock); | |
400 | return ret; | |
401 | } | |
402 | spin_unlock_irq(cdev->ccwlock); | |
403 | if (ret == 0) | |
404 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
405 | else { | |
139b83dd | 406 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
407 | "device 0.%x.%04x\n", |
408 | ret, cdev->private->dev_id.ssid, | |
409 | cdev->private->dev_id.devno); | |
1da177e4 LT |
410 | cdev->online = 1; |
411 | } | |
412 | return ret; | |
413 | } | |
414 | ||
b2ffd8e9 CH |
415 | /** |
416 | * ccw_device_set_online() - enable a ccw device for I/O | |
417 | * @cdev: target ccw device | |
418 | * | |
419 | * This function first enables @cdev and then calls the driver's set_online() | |
420 | * function for @cdev, if given. If set_online() returns an error, @cdev is | |
421 | * disabled again. | |
422 | * Returns: | |
423 | * %0 on success and a negative error value on failure. | |
424 | * Context: | |
425 | * enabled, ccw device lock not held | |
426 | */ | |
427 | int ccw_device_set_online(struct ccw_device *cdev) | |
1da177e4 LT |
428 | { |
429 | int ret; | |
430 | ||
431 | if (!cdev) | |
432 | return -ENODEV; | |
433 | if (cdev->online || !cdev->drv) | |
434 | return -EINVAL; | |
435 | ||
436 | spin_lock_irq(cdev->ccwlock); | |
437 | ret = ccw_device_online(cdev); | |
438 | spin_unlock_irq(cdev->ccwlock); | |
439 | if (ret == 0) | |
440 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
441 | else { | |
139b83dd | 442 | CIO_MSG_EVENT(0, "ccw_device_online returned %d, " |
e556bbbd CH |
443 | "device 0.%x.%04x\n", |
444 | ret, cdev->private->dev_id.ssid, | |
445 | cdev->private->dev_id.devno); | |
1da177e4 LT |
446 | return ret; |
447 | } | |
448 | if (cdev->private->state != DEV_STATE_ONLINE) | |
449 | return -ENODEV; | |
450 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { | |
451 | cdev->online = 1; | |
452 | return 0; | |
453 | } | |
454 | spin_lock_irq(cdev->ccwlock); | |
455 | ret = ccw_device_offline(cdev); | |
456 | spin_unlock_irq(cdev->ccwlock); | |
457 | if (ret == 0) | |
458 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
e556bbbd | 459 | else |
139b83dd | 460 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
461 | "device 0.%x.%04x\n", |
462 | ret, cdev->private->dev_id.ssid, | |
463 | cdev->private->dev_id.devno); | |
6cadb78b | 464 | return (ret == 0) ? -ENODEV : ret; |
1da177e4 LT |
465 | } |
466 | ||
f5ba6c86 CH |
467 | static void online_store_handle_offline(struct ccw_device *cdev) |
468 | { | |
469 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
470 | ccw_device_remove_disconnected(cdev); | |
471 | else if (cdev->drv && cdev->drv->set_offline) | |
472 | ccw_device_set_offline(cdev); | |
473 | } | |
474 | ||
475 | static int online_store_recog_and_online(struct ccw_device *cdev) | |
476 | { | |
477 | int ret; | |
478 | ||
479 | /* Do device recognition, if needed. */ | |
480 | if (cdev->id.cu_type == 0) { | |
481 | ret = ccw_device_recognition(cdev); | |
482 | if (ret) { | |
e556bbbd CH |
483 | CIO_MSG_EVENT(0, "Couldn't start recognition " |
484 | "for device 0.%x.%04x (ret=%d)\n", | |
485 | cdev->private->dev_id.ssid, | |
486 | cdev->private->dev_id.devno, ret); | |
f5ba6c86 CH |
487 | return ret; |
488 | } | |
489 | wait_event(cdev->private->wait_q, | |
490 | cdev->private->flags.recog_done); | |
491 | } | |
492 | if (cdev->drv && cdev->drv->set_online) | |
493 | ccw_device_set_online(cdev); | |
494 | return 0; | |
495 | } | |
c78aa6cb | 496 | static int online_store_handle_online(struct ccw_device *cdev, int force) |
f5ba6c86 CH |
497 | { |
498 | int ret; | |
499 | ||
500 | ret = online_store_recog_and_online(cdev); | |
501 | if (ret) | |
c78aa6cb | 502 | return ret; |
f5ba6c86 CH |
503 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
504 | ret = ccw_device_stlck(cdev); | |
c78aa6cb ME |
505 | if (ret) |
506 | return ret; | |
f5ba6c86 CH |
507 | if (cdev->id.cu_type == 0) |
508 | cdev->private->state = DEV_STATE_NOT_OPER; | |
509 | online_store_recog_and_online(cdev); | |
510 | } | |
c78aa6cb | 511 | return 0; |
f5ba6c86 CH |
512 | } |
513 | ||
514 | static ssize_t online_store (struct device *dev, struct device_attribute *attr, | |
515 | const char *buf, size_t count) | |
1da177e4 LT |
516 | { |
517 | struct ccw_device *cdev = to_ccwdev(dev); | |
2f972202 CH |
518 | int force, ret; |
519 | unsigned long i; | |
1da177e4 | 520 | |
973bd993 | 521 | if (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: | |
540 | online_store_handle_offline(cdev); | |
2f972202 | 541 | ret = count; |
f5ba6c86 CH |
542 | break; |
543 | case 1: | |
c78aa6cb ME |
544 | ret = online_store_handle_online(cdev, force); |
545 | if (!ret) | |
546 | ret = count; | |
f5ba6c86 CH |
547 | break; |
548 | default: | |
2f972202 | 549 | ret = -EINVAL; |
1da177e4 | 550 | } |
2f972202 | 551 | out: |
1da177e4 LT |
552 | if (cdev->drv) |
553 | module_put(cdev->drv->owner); | |
554 | atomic_set(&cdev->private->onoff, 0); | |
2f972202 | 555 | return ret; |
1da177e4 LT |
556 | } |
557 | ||
558 | static ssize_t | |
3fd3c0a5 | 559 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
560 | { |
561 | struct ccw_device *cdev = to_ccwdev(dev); | |
562 | struct subchannel *sch; | |
563 | ||
d7b5a4c9 CH |
564 | if (ccw_device_is_orphan(cdev)) |
565 | return sprintf(buf, "no device\n"); | |
1da177e4 LT |
566 | switch (cdev->private->state) { |
567 | case DEV_STATE_BOXED: | |
568 | return sprintf(buf, "boxed\n"); | |
569 | case DEV_STATE_DISCONNECTED: | |
570 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
571 | case DEV_STATE_NOT_OPER: | |
572 | sch = to_subchannel(dev->parent); | |
573 | if (!sch->lpm) | |
574 | return sprintf(buf, "no path\n"); | |
575 | else | |
576 | return sprintf(buf, "no device\n"); | |
577 | default: | |
578 | /* All other states considered fine. */ | |
579 | return sprintf(buf, "good\n"); | |
580 | } | |
581 | } | |
582 | ||
583 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
584 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
585 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
586 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 587 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 | 588 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
1da177e4 LT |
589 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
590 | ||
7e9db9ea | 591 | static struct attribute *io_subchannel_attrs[] = { |
1da177e4 LT |
592 | &dev_attr_chpids.attr, |
593 | &dev_attr_pimpampom.attr, | |
594 | NULL, | |
595 | }; | |
596 | ||
7e9db9ea CH |
597 | static struct attribute_group io_subchannel_attr_group = { |
598 | .attrs = io_subchannel_attrs, | |
529192f3 | 599 | }; |
1da177e4 LT |
600 | |
601 | static struct attribute * ccwdev_attrs[] = { | |
602 | &dev_attr_devtype.attr, | |
603 | &dev_attr_cutype.attr, | |
f1fc78a8 | 604 | &dev_attr_modalias.attr, |
1da177e4 LT |
605 | &dev_attr_online.attr, |
606 | &dev_attr_cmb_enable.attr, | |
607 | &dev_attr_availability.attr, | |
608 | NULL, | |
609 | }; | |
610 | ||
611 | static struct attribute_group ccwdev_attr_group = { | |
612 | .attrs = ccwdev_attrs, | |
613 | }; | |
614 | ||
f7e5d67c | 615 | static struct attribute_group *ccwdev_attr_groups[] = { |
ef99516c CH |
616 | &ccwdev_attr_group, |
617 | NULL, | |
618 | }; | |
1da177e4 LT |
619 | |
620 | /* this is a simple abstraction for device_register that sets the | |
621 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 622 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
623 | { |
624 | struct device *dev = &cdev->dev; | |
625 | int ret; | |
626 | ||
627 | dev->bus = &ccw_bus_type; | |
628 | ||
629 | if ((ret = device_add(dev))) | |
630 | return ret; | |
631 | ||
632 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
633 | return ret; |
634 | } | |
635 | ||
b0744bd2 | 636 | struct match_data { |
78964268 | 637 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
638 | struct ccw_device * sibling; |
639 | }; | |
640 | ||
641 | static int | |
642 | match_devno(struct device * dev, void * data) | |
643 | { | |
78964268 | 644 | struct match_data * d = data; |
b0744bd2 CH |
645 | struct ccw_device * cdev; |
646 | ||
647 | cdev = to_ccwdev(dev); | |
648 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
d7b5a4c9 | 649 | !ccw_device_is_orphan(cdev) && |
78964268 | 650 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
d7b5a4c9 | 651 | (cdev != d->sibling)) |
b0744bd2 | 652 | return 1; |
b0744bd2 CH |
653 | return 0; |
654 | } | |
655 | ||
78964268 CH |
656 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
657 | struct ccw_device *sibling) | |
1da177e4 | 658 | { |
1da177e4 | 659 | struct device *dev; |
292888c8 | 660 | struct match_data data; |
1da177e4 | 661 | |
78964268 | 662 | data.dev_id = *dev_id; |
292888c8 | 663 | data.sibling = sibling; |
e5945b4f | 664 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 665 | |
b0744bd2 | 666 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
667 | } |
668 | ||
d7b5a4c9 CH |
669 | static int match_orphan(struct device *dev, void *data) |
670 | { | |
671 | struct ccw_dev_id *dev_id; | |
672 | struct ccw_device *cdev; | |
673 | ||
674 | dev_id = data; | |
675 | cdev = to_ccwdev(dev); | |
676 | return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); | |
677 | } | |
678 | ||
679 | static struct ccw_device * | |
680 | get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css, | |
681 | struct ccw_dev_id *dev_id) | |
682 | { | |
683 | struct device *dev; | |
684 | ||
685 | dev = device_find_child(&css->pseudo_subchannel->dev, dev_id, | |
686 | match_orphan); | |
687 | ||
688 | return dev ? to_ccwdev(dev) : NULL; | |
689 | } | |
690 | ||
1da177e4 | 691 | static void |
c1637532 | 692 | ccw_device_add_changed(struct work_struct *work) |
1da177e4 | 693 | { |
c1637532 | 694 | struct ccw_device_private *priv; |
1da177e4 LT |
695 | struct ccw_device *cdev; |
696 | ||
c1637532 MS |
697 | priv = container_of(work, struct ccw_device_private, kick_work); |
698 | cdev = priv->cdev; | |
1da177e4 LT |
699 | if (device_add(&cdev->dev)) { |
700 | put_device(&cdev->dev); | |
701 | return; | |
702 | } | |
703 | set_bit(1, &cdev->private->registered); | |
1da177e4 LT |
704 | } |
705 | ||
d7b5a4c9 | 706 | void ccw_device_do_unreg_rereg(struct work_struct *work) |
1da177e4 | 707 | { |
c1637532 | 708 | struct ccw_device_private *priv; |
1da177e4 LT |
709 | struct ccw_device *cdev; |
710 | struct subchannel *sch; | |
1da177e4 | 711 | |
c1637532 MS |
712 | priv = container_of(work, struct ccw_device_private, kick_work); |
713 | cdev = priv->cdev; | |
1da177e4 | 714 | sch = to_subchannel(cdev->dev.parent); |
d7b5a4c9 | 715 | |
ef99516c | 716 | ccw_device_unregister(cdev); |
1da177e4 | 717 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 718 | ccw_device_add_changed); |
1da177e4 LT |
719 | queue_work(ccw_device_work, &cdev->private->kick_work); |
720 | } | |
721 | ||
722 | static void | |
723 | ccw_device_release(struct device *dev) | |
724 | { | |
725 | struct ccw_device *cdev; | |
726 | ||
727 | cdev = to_ccwdev(dev); | |
728 | kfree(cdev->private); | |
729 | kfree(cdev); | |
730 | } | |
731 | ||
7674da77 CH |
732 | static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) |
733 | { | |
734 | struct ccw_device *cdev; | |
735 | ||
736 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
737 | if (cdev) { | |
738 | cdev->private = kzalloc(sizeof(struct ccw_device_private), | |
739 | GFP_KERNEL | GFP_DMA); | |
740 | if (cdev->private) | |
741 | return cdev; | |
742 | } | |
743 | kfree(cdev); | |
744 | return ERR_PTR(-ENOMEM); | |
745 | } | |
746 | ||
747 | static int io_subchannel_initialize_dev(struct subchannel *sch, | |
748 | struct ccw_device *cdev) | |
749 | { | |
750 | cdev->private->cdev = cdev; | |
751 | atomic_set(&cdev->private->onoff, 0); | |
752 | cdev->dev.parent = &sch->dev; | |
753 | cdev->dev.release = ccw_device_release; | |
33583c36 | 754 | INIT_WORK(&cdev->private->kick_work, NULL); |
ef99516c | 755 | cdev->dev.groups = ccwdev_attr_groups; |
7674da77 CH |
756 | /* Do first half of device_register. */ |
757 | device_initialize(&cdev->dev); | |
758 | if (!get_device(&sch->dev)) { | |
759 | if (cdev->dev.release) | |
760 | cdev->dev.release(&cdev->dev); | |
761 | return -ENODEV; | |
762 | } | |
763 | return 0; | |
764 | } | |
765 | ||
766 | static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) | |
767 | { | |
768 | struct ccw_device *cdev; | |
769 | int ret; | |
770 | ||
771 | cdev = io_subchannel_allocate_dev(sch); | |
772 | if (!IS_ERR(cdev)) { | |
773 | ret = io_subchannel_initialize_dev(sch, cdev); | |
774 | if (ret) { | |
775 | kfree(cdev); | |
776 | cdev = ERR_PTR(ret); | |
777 | } | |
778 | } | |
779 | return cdev; | |
780 | } | |
781 | ||
d7b5a4c9 CH |
782 | static int io_subchannel_recog(struct ccw_device *, struct subchannel *); |
783 | ||
784 | static void sch_attach_device(struct subchannel *sch, | |
785 | struct ccw_device *cdev) | |
786 | { | |
82b7ac05 | 787 | css_update_ssd_info(sch); |
d7b5a4c9 | 788 | spin_lock_irq(sch->lock); |
db6a6423 | 789 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
790 | cdev->private->schid = sch->schid; |
791 | cdev->ccwlock = sch->lock; | |
c820de39 | 792 | ccw_device_trigger_reprobe(cdev); |
d7b5a4c9 CH |
793 | spin_unlock_irq(sch->lock); |
794 | } | |
795 | ||
796 | static void sch_attach_disconnected_device(struct subchannel *sch, | |
797 | struct ccw_device *cdev) | |
798 | { | |
799 | struct subchannel *other_sch; | |
800 | int ret; | |
801 | ||
802 | other_sch = to_subchannel(get_device(cdev->dev.parent)); | |
803 | ret = device_move(&cdev->dev, &sch->dev); | |
804 | if (ret) { | |
139b83dd | 805 | CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed " |
d7b5a4c9 CH |
806 | "(ret=%d)!\n", cdev->private->dev_id.ssid, |
807 | cdev->private->dev_id.devno, ret); | |
808 | put_device(&other_sch->dev); | |
809 | return; | |
810 | } | |
db6a6423 | 811 | sch_set_cdev(other_sch, NULL); |
d7b5a4c9 CH |
812 | /* No need to keep a subchannel without ccw device around. */ |
813 | css_sch_device_unregister(other_sch); | |
814 | put_device(&other_sch->dev); | |
815 | sch_attach_device(sch, cdev); | |
816 | } | |
817 | ||
818 | static void sch_attach_orphaned_device(struct subchannel *sch, | |
819 | struct ccw_device *cdev) | |
820 | { | |
821 | int ret; | |
822 | ||
823 | /* Try to move the ccw device to its new subchannel. */ | |
824 | ret = device_move(&cdev->dev, &sch->dev); | |
825 | if (ret) { | |
826 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage " | |
827 | "failed (ret=%d)!\n", | |
828 | cdev->private->dev_id.ssid, | |
829 | cdev->private->dev_id.devno, ret); | |
830 | return; | |
831 | } | |
832 | sch_attach_device(sch, cdev); | |
833 | } | |
834 | ||
835 | static void sch_create_and_recog_new_device(struct subchannel *sch) | |
836 | { | |
837 | struct ccw_device *cdev; | |
838 | ||
839 | /* Need to allocate a new ccw device. */ | |
840 | cdev = io_subchannel_create_ccwdev(sch); | |
841 | if (IS_ERR(cdev)) { | |
842 | /* OK, we did everything we could... */ | |
843 | css_sch_device_unregister(sch); | |
844 | return; | |
845 | } | |
846 | spin_lock_irq(sch->lock); | |
db6a6423 | 847 | sch_set_cdev(sch, cdev); |
d7b5a4c9 CH |
848 | spin_unlock_irq(sch->lock); |
849 | /* Start recognition for the new ccw device. */ | |
850 | if (io_subchannel_recog(cdev, sch)) { | |
851 | spin_lock_irq(sch->lock); | |
db6a6423 | 852 | sch_set_cdev(sch, NULL); |
d7b5a4c9 CH |
853 | spin_unlock_irq(sch->lock); |
854 | if (cdev->dev.release) | |
855 | cdev->dev.release(&cdev->dev); | |
856 | css_sch_device_unregister(sch); | |
857 | } | |
858 | } | |
859 | ||
860 | ||
861 | void ccw_device_move_to_orphanage(struct work_struct *work) | |
862 | { | |
863 | struct ccw_device_private *priv; | |
864 | struct ccw_device *cdev; | |
865 | struct ccw_device *replacing_cdev; | |
866 | struct subchannel *sch; | |
867 | int ret; | |
868 | struct channel_subsystem *css; | |
869 | struct ccw_dev_id dev_id; | |
870 | ||
871 | priv = container_of(work, struct ccw_device_private, kick_work); | |
872 | cdev = priv->cdev; | |
873 | sch = to_subchannel(cdev->dev.parent); | |
874 | css = to_css(sch->dev.parent); | |
875 | dev_id.devno = sch->schib.pmcw.dev; | |
876 | dev_id.ssid = sch->schid.ssid; | |
877 | ||
878 | /* | |
879 | * Move the orphaned ccw device to the orphanage so the replacing | |
880 | * ccw device can take its place on the subchannel. | |
881 | */ | |
882 | ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev); | |
883 | if (ret) { | |
884 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed " | |
885 | "(ret=%d)!\n", cdev->private->dev_id.ssid, | |
886 | cdev->private->dev_id.devno, ret); | |
887 | return; | |
888 | } | |
889 | cdev->ccwlock = css->pseudo_subchannel->lock; | |
890 | /* | |
891 | * Search for the replacing ccw device | |
892 | * - among the disconnected devices | |
893 | * - in the orphanage | |
894 | */ | |
895 | replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
896 | if (replacing_cdev) { | |
897 | sch_attach_disconnected_device(sch, replacing_cdev); | |
898 | return; | |
899 | } | |
900 | replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id); | |
901 | if (replacing_cdev) { | |
902 | sch_attach_orphaned_device(sch, replacing_cdev); | |
903 | return; | |
904 | } | |
905 | sch_create_and_recog_new_device(sch); | |
906 | } | |
907 | ||
1da177e4 LT |
908 | /* |
909 | * Register recognized device. | |
910 | */ | |
911 | static void | |
c1637532 | 912 | io_subchannel_register(struct work_struct *work) |
1da177e4 | 913 | { |
c1637532 | 914 | struct ccw_device_private *priv; |
1da177e4 LT |
915 | struct ccw_device *cdev; |
916 | struct subchannel *sch; | |
917 | int ret; | |
918 | unsigned long flags; | |
919 | ||
c1637532 MS |
920 | priv = container_of(work, struct ccw_device_private, kick_work); |
921 | cdev = priv->cdev; | |
1da177e4 | 922 | sch = to_subchannel(cdev->dev.parent); |
82b7ac05 | 923 | css_update_ssd_info(sch); |
47af5518 CH |
924 | /* |
925 | * io_subchannel_register() will also be called after device | |
926 | * recognition has been done for a boxed device (which will already | |
927 | * be registered). We need to reprobe since we may now have sense id | |
928 | * information. | |
929 | */ | |
b0744bd2 | 930 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
47af5518 CH |
931 | if (!cdev->drv) { |
932 | ret = device_reprobe(&cdev->dev); | |
933 | if (ret) | |
934 | /* We can't do much here. */ | |
139b83dd | 935 | CIO_MSG_EVENT(0, "device_reprobe() returned" |
e556bbbd CH |
936 | " %d for 0.%x.%04x\n", ret, |
937 | cdev->private->dev_id.ssid, | |
938 | cdev->private->dev_id.devno); | |
47af5518 | 939 | } |
1da177e4 LT |
940 | goto out; |
941 | } | |
fa1a8c23 CH |
942 | /* |
943 | * Now we know this subchannel will stay, we can throw | |
944 | * our delayed uevent. | |
945 | */ | |
946 | sch->dev.uevent_suppress = 0; | |
947 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
948 | /* make it known to the system */ |
949 | ret = ccw_device_register(cdev); | |
950 | if (ret) { | |
e556bbbd CH |
951 | CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", |
952 | cdev->private->dev_id.ssid, | |
953 | cdev->private->dev_id.devno, ret); | |
1da177e4 | 954 | put_device(&cdev->dev); |
2ec22984 | 955 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 956 | sch_set_cdev(sch, NULL); |
2ec22984 | 957 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
958 | kfree (cdev->private); |
959 | kfree (cdev); | |
960 | put_device(&sch->dev); | |
961 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
962 | wake_up(&ccw_device_init_wq); | |
963 | return; | |
964 | } | |
1da177e4 LT |
965 | put_device(&cdev->dev); |
966 | out: | |
967 | cdev->private->flags.recog_done = 1; | |
968 | put_device(&sch->dev); | |
969 | wake_up(&cdev->private->wait_q); | |
970 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
971 | wake_up(&ccw_device_init_wq); | |
972 | } | |
973 | ||
3f4cf6e7 | 974 | static void ccw_device_call_sch_unregister(struct work_struct *work) |
1da177e4 | 975 | { |
c1637532 MS |
976 | struct ccw_device_private *priv; |
977 | struct ccw_device *cdev; | |
1da177e4 LT |
978 | struct subchannel *sch; |
979 | ||
c1637532 MS |
980 | priv = container_of(work, struct ccw_device_private, kick_work); |
981 | cdev = priv->cdev; | |
1da177e4 | 982 | sch = to_subchannel(cdev->dev.parent); |
6ab4879a | 983 | css_sch_device_unregister(sch); |
1da177e4 LT |
984 | /* Reset intparm to zeroes. */ |
985 | sch->schib.pmcw.intparm = 0; | |
986 | cio_modify(sch); | |
987 | put_device(&cdev->dev); | |
988 | put_device(&sch->dev); | |
989 | } | |
990 | ||
991 | /* | |
992 | * subchannel recognition done. Called from the state machine. | |
993 | */ | |
994 | void | |
995 | io_subchannel_recog_done(struct ccw_device *cdev) | |
996 | { | |
997 | struct subchannel *sch; | |
998 | ||
999 | if (css_init_done == 0) { | |
1000 | cdev->private->flags.recog_done = 1; | |
1001 | return; | |
1002 | } | |
1003 | switch (cdev->private->state) { | |
1004 | case DEV_STATE_NOT_OPER: | |
1005 | cdev->private->flags.recog_done = 1; | |
1006 | /* Remove device found not operational. */ | |
1007 | if (!get_device(&cdev->dev)) | |
1008 | break; | |
1009 | sch = to_subchannel(cdev->dev.parent); | |
1010 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1011 | ccw_device_call_sch_unregister); |
1da177e4 LT |
1012 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1013 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1014 | wake_up(&ccw_device_init_wq); | |
1015 | break; | |
1016 | case DEV_STATE_BOXED: | |
1017 | /* Device did not respond in time. */ | |
1018 | case DEV_STATE_OFFLINE: | |
1019 | /* | |
1020 | * We can't register the device in interrupt context so | |
1021 | * we schedule a work item. | |
1022 | */ | |
1023 | if (!get_device(&cdev->dev)) | |
1024 | break; | |
1025 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1026 | io_subchannel_register); |
1da177e4 LT |
1027 | queue_work(slow_path_wq, &cdev->private->kick_work); |
1028 | break; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | static int | |
1033 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
1034 | { | |
1035 | int rc; | |
1036 | struct ccw_device_private *priv; | |
1037 | ||
db6a6423 | 1038 | sch_set_cdev(sch, cdev); |
2ec22984 | 1039 | cdev->ccwlock = sch->lock; |
fb6958a5 | 1040 | |
1da177e4 LT |
1041 | /* Init private data. */ |
1042 | priv = cdev->private; | |
78964268 CH |
1043 | priv->dev_id.devno = sch->schib.pmcw.dev; |
1044 | priv->dev_id.ssid = sch->schid.ssid; | |
1045 | priv->schid = sch->schid; | |
1da177e4 LT |
1046 | priv->state = DEV_STATE_NOT_OPER; |
1047 | INIT_LIST_HEAD(&priv->cmb_list); | |
1048 | init_waitqueue_head(&priv->wait_q); | |
1049 | init_timer(&priv->timer); | |
1050 | ||
1051 | /* Set an initial name for the device. */ | |
fb6958a5 CH |
1052 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", |
1053 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 LT |
1054 | |
1055 | /* Increase counter of devices currently in recognition. */ | |
1056 | atomic_inc(&ccw_device_init_count); | |
1057 | ||
1058 | /* Start async. device sensing. */ | |
2ec22984 | 1059 | spin_lock_irq(sch->lock); |
1da177e4 | 1060 | rc = ccw_device_recognition(cdev); |
2ec22984 | 1061 | spin_unlock_irq(sch->lock); |
1da177e4 LT |
1062 | if (rc) { |
1063 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
1064 | wake_up(&ccw_device_init_wq); | |
1065 | } | |
1066 | return rc; | |
1067 | } | |
1068 | ||
d7b5a4c9 CH |
1069 | static void ccw_device_move_to_sch(struct work_struct *work) |
1070 | { | |
1071 | struct ccw_device_private *priv; | |
1072 | int rc; | |
1073 | struct subchannel *sch; | |
1074 | struct ccw_device *cdev; | |
1075 | struct subchannel *former_parent; | |
1076 | ||
1077 | priv = container_of(work, struct ccw_device_private, kick_work); | |
1078 | sch = priv->sch; | |
1079 | cdev = priv->cdev; | |
1080 | former_parent = ccw_device_is_orphan(cdev) ? | |
1081 | NULL : to_subchannel(get_device(cdev->dev.parent)); | |
1082 | mutex_lock(&sch->reg_mutex); | |
1083 | /* Try to move the ccw device to its new subchannel. */ | |
1084 | rc = device_move(&cdev->dev, &sch->dev); | |
1085 | mutex_unlock(&sch->reg_mutex); | |
1086 | if (rc) { | |
139b83dd | 1087 | CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel " |
d7b5a4c9 CH |
1088 | "0.%x.%04x failed (ret=%d)!\n", |
1089 | cdev->private->dev_id.ssid, | |
1090 | cdev->private->dev_id.devno, sch->schid.ssid, | |
1091 | sch->schid.sch_no, rc); | |
1092 | css_sch_device_unregister(sch); | |
1093 | goto out; | |
1094 | } | |
1095 | if (former_parent) { | |
1096 | spin_lock_irq(former_parent->lock); | |
db6a6423 | 1097 | sch_set_cdev(former_parent, NULL); |
d7b5a4c9 CH |
1098 | spin_unlock_irq(former_parent->lock); |
1099 | css_sch_device_unregister(former_parent); | |
1100 | /* Reset intparm to zeroes. */ | |
1101 | former_parent->schib.pmcw.intparm = 0; | |
1102 | cio_modify(former_parent); | |
1103 | } | |
1104 | sch_attach_device(sch, cdev); | |
1105 | out: | |
1106 | if (former_parent) | |
1107 | put_device(&former_parent->dev); | |
1108 | put_device(&cdev->dev); | |
1109 | } | |
1110 | ||
602b20f2 CH |
1111 | static void io_subchannel_irq(struct subchannel *sch) |
1112 | { | |
1113 | struct ccw_device *cdev; | |
1114 | ||
db6a6423 | 1115 | cdev = sch_get_cdev(sch); |
602b20f2 CH |
1116 | |
1117 | CIO_TRACE_EVENT(3, "IRQ"); | |
1118 | CIO_TRACE_EVENT(3, sch->dev.bus_id); | |
1119 | if (cdev) | |
1120 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1121 | } | |
1122 | ||
0ae7a7b2 CH |
1123 | static void io_subchannel_init_fields(struct subchannel *sch) |
1124 | { | |
1125 | if (cio_is_console(sch->schid)) | |
1126 | sch->opm = 0xff; | |
1127 | else | |
1128 | sch->opm = chp_get_sch_opm(sch); | |
1129 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
3a3fc29a | 1130 | sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; |
0ae7a7b2 CH |
1131 | |
1132 | CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" | |
1133 | " - PIM = %02X, PAM = %02X, POM = %02X\n", | |
1134 | sch->schib.pmcw.dev, sch->schid.ssid, | |
1135 | sch->schid.sch_no, sch->schib.pmcw.pim, | |
1136 | sch->schib.pmcw.pam, sch->schib.pmcw.pom); | |
1137 | /* Initially set up some fields in the pmcw. */ | |
1138 | sch->schib.pmcw.ena = 0; | |
1139 | sch->schib.pmcw.csense = 1; /* concurrent sense */ | |
1140 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1141 | sch->schib.pmcw.mp = 1; /* multipath mode */ | |
1142 | /* clean up possible residual cmf stuff */ | |
1143 | sch->schib.pmcw.mme = 0; | |
1144 | sch->schib.pmcw.mbfc = 0; | |
1145 | sch->schib.pmcw.mbi = 0; | |
1146 | sch->schib.mba = 0; | |
1147 | } | |
1148 | ||
1149 | static int io_subchannel_probe(struct subchannel *sch) | |
1da177e4 | 1150 | { |
1da177e4 LT |
1151 | struct ccw_device *cdev; |
1152 | int rc; | |
1153 | unsigned long flags; | |
d7b5a4c9 | 1154 | struct ccw_dev_id dev_id; |
1da177e4 | 1155 | |
db6a6423 CH |
1156 | cdev = sch_get_cdev(sch); |
1157 | if (cdev) { | |
7e9db9ea CH |
1158 | rc = sysfs_create_group(&sch->dev.kobj, |
1159 | &io_subchannel_attr_group); | |
1160 | if (rc) | |
1161 | CIO_MSG_EVENT(0, "Failed to create io subchannel " | |
1162 | "attributes for subchannel " | |
1163 | "0.%x.%04x (rc=%d)\n", | |
1164 | sch->schid.ssid, sch->schid.sch_no, rc); | |
1da177e4 LT |
1165 | /* |
1166 | * This subchannel already has an associated ccw_device. | |
7e9db9ea CH |
1167 | * Throw the delayed uevent for the subchannel, register |
1168 | * the ccw_device and exit. This happens for all early | |
1169 | * devices, e.g. the console. | |
1da177e4 | 1170 | */ |
7e9db9ea CH |
1171 | sch->dev.uevent_suppress = 0; |
1172 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); | |
e1031786 | 1173 | cdev->dev.groups = ccwdev_attr_groups; |
1da177e4 LT |
1174 | device_initialize(&cdev->dev); |
1175 | ccw_device_register(cdev); | |
1da177e4 LT |
1176 | /* |
1177 | * Check if the device is already online. If it is | |
1178 | * the reference count needs to be corrected | |
1179 | * (see ccw_device_online and css_init_done for the | |
1180 | * ugly details). | |
1181 | */ | |
1182 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
1183 | cdev->private->state != DEV_STATE_OFFLINE && | |
1184 | cdev->private->state != DEV_STATE_BOXED) | |
1185 | get_device(&cdev->dev); | |
1186 | return 0; | |
1187 | } | |
0ae7a7b2 | 1188 | io_subchannel_init_fields(sch); |
d7b5a4c9 CH |
1189 | /* |
1190 | * First check if a fitting device may be found amongst the | |
1191 | * disconnected devices or in the orphanage. | |
1192 | */ | |
1193 | dev_id.devno = sch->schib.pmcw.dev; | |
1194 | dev_id.ssid = sch->schid.ssid; | |
7e9db9ea CH |
1195 | rc = sysfs_create_group(&sch->dev.kobj, |
1196 | &io_subchannel_attr_group); | |
1197 | if (rc) | |
1198 | return rc; | |
cd6b4f27 CH |
1199 | /* Allocate I/O subchannel private data. */ |
1200 | sch->private = kzalloc(sizeof(struct io_subchannel_private), | |
1201 | GFP_KERNEL | GFP_DMA); | |
7e9db9ea CH |
1202 | if (!sch->private) { |
1203 | rc = -ENOMEM; | |
1204 | goto out_err; | |
1205 | } | |
d7b5a4c9 CH |
1206 | cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL); |
1207 | if (!cdev) | |
1208 | cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent), | |
1209 | &dev_id); | |
1210 | if (cdev) { | |
1211 | /* | |
1212 | * Schedule moving the device until when we have a registered | |
1213 | * subchannel to move to and succeed the probe. We can | |
1214 | * unregister later again, when the probe is through. | |
1215 | */ | |
1216 | cdev->private->sch = sch; | |
1217 | PREPARE_WORK(&cdev->private->kick_work, | |
1218 | ccw_device_move_to_sch); | |
1219 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
1220 | return 0; | |
1221 | } | |
7674da77 | 1222 | cdev = io_subchannel_create_ccwdev(sch); |
cd6b4f27 | 1223 | if (IS_ERR(cdev)) { |
7e9db9ea CH |
1224 | rc = PTR_ERR(cdev); |
1225 | goto out_err; | |
cd6b4f27 | 1226 | } |
8bbace7e | 1227 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 | 1228 | if (rc) { |
2ec22984 | 1229 | spin_lock_irqsave(sch->lock, flags); |
db6a6423 | 1230 | sch_set_cdev(sch, NULL); |
2ec22984 | 1231 | spin_unlock_irqrestore(sch->lock, flags); |
1da177e4 LT |
1232 | if (cdev->dev.release) |
1233 | cdev->dev.release(&cdev->dev); | |
7e9db9ea | 1234 | goto out_err; |
1da177e4 | 1235 | } |
7e9db9ea CH |
1236 | return 0; |
1237 | out_err: | |
1238 | kfree(sch->private); | |
1239 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); | |
1da177e4 LT |
1240 | return rc; |
1241 | } | |
1242 | ||
1da177e4 | 1243 | static int |
8bbace7e | 1244 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
1245 | { |
1246 | struct ccw_device *cdev; | |
1247 | unsigned long flags; | |
1248 | ||
db6a6423 CH |
1249 | cdev = sch_get_cdev(sch); |
1250 | if (!cdev) | |
1da177e4 | 1251 | return 0; |
1da177e4 LT |
1252 | /* Set ccw device to not operational and drop reference. */ |
1253 | spin_lock_irqsave(cdev->ccwlock, flags); | |
db6a6423 | 1254 | sch_set_cdev(sch, NULL); |
1da177e4 LT |
1255 | cdev->private->state = DEV_STATE_NOT_OPER; |
1256 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
ef99516c CH |
1257 | ccw_device_unregister(cdev); |
1258 | put_device(&cdev->dev); | |
cd6b4f27 | 1259 | kfree(sch->private); |
7e9db9ea | 1260 | sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); |
1da177e4 LT |
1261 | return 0; |
1262 | } | |
1263 | ||
602b20f2 | 1264 | static int io_subchannel_notify(struct subchannel *sch, int event) |
1da177e4 LT |
1265 | { |
1266 | struct ccw_device *cdev; | |
1267 | ||
db6a6423 | 1268 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1269 | if (!cdev) |
1270 | return 0; | |
c820de39 | 1271 | return ccw_device_notify(cdev, event); |
1da177e4 LT |
1272 | } |
1273 | ||
602b20f2 | 1274 | static void io_subchannel_verify(struct subchannel *sch) |
1da177e4 LT |
1275 | { |
1276 | struct ccw_device *cdev; | |
1277 | ||
db6a6423 | 1278 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
1279 | if (cdev) |
1280 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1281 | } | |
1282 | ||
c820de39 | 1283 | static int check_for_io_on_path(struct subchannel *sch, int mask) |
1da177e4 | 1284 | { |
c820de39 | 1285 | int cc; |
1da177e4 | 1286 | |
c820de39 CH |
1287 | cc = stsch(sch->schid, &sch->schib); |
1288 | if (cc) | |
1289 | return 0; | |
23d805b6 | 1290 | if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask) |
c820de39 CH |
1291 | return 1; |
1292 | return 0; | |
1293 | } | |
1294 | ||
1295 | static void terminate_internal_io(struct subchannel *sch, | |
1296 | struct ccw_device *cdev) | |
1297 | { | |
1298 | if (cio_clear(sch)) { | |
1299 | /* Recheck device in case clear failed. */ | |
1300 | sch->lpm = 0; | |
1301 | if (cdev->online) | |
1302 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1303 | else | |
1304 | css_schedule_eval(sch->schid); | |
d23861ff | 1305 | return; |
c820de39 | 1306 | } |
1da177e4 | 1307 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
c820de39 CH |
1308 | /* Request retry of internal operation. */ |
1309 | cdev->private->flags.intretry = 1; | |
1310 | /* Call handler. */ | |
1da177e4 LT |
1311 | if (cdev->handler) |
1312 | cdev->handler(cdev, cdev->private->intparm, | |
1313 | ERR_PTR(-EIO)); | |
1314 | } | |
1315 | ||
c820de39 CH |
1316 | static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) |
1317 | { | |
1318 | struct ccw_device *cdev; | |
1319 | ||
1320 | cdev = sch_get_cdev(sch); | |
1321 | if (!cdev) | |
1322 | return; | |
1323 | if (check_for_io_on_path(sch, mask)) { | |
1324 | if (cdev->private->state == DEV_STATE_ONLINE) | |
1325 | ccw_device_kill_io(cdev); | |
1326 | else { | |
1327 | terminate_internal_io(sch, cdev); | |
1328 | /* Re-start path verification. */ | |
1329 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1330 | } | |
1331 | } else | |
1332 | /* trigger path verification. */ | |
1333 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1334 | ||
1335 | } | |
1336 | ||
99611f87 CH |
1337 | static int io_subchannel_chp_event(struct subchannel *sch, |
1338 | struct chp_link *link, int event) | |
c820de39 CH |
1339 | { |
1340 | int mask; | |
c820de39 | 1341 | |
99611f87 | 1342 | mask = chp_ssd_get_mask(&sch->ssd_info, link); |
c820de39 CH |
1343 | if (!mask) |
1344 | return 0; | |
1345 | switch (event) { | |
1346 | case CHP_VARY_OFF: | |
1347 | sch->opm &= ~mask; | |
1348 | sch->lpm &= ~mask; | |
1349 | io_subchannel_terminate_path(sch, mask); | |
1350 | break; | |
1351 | case CHP_VARY_ON: | |
1352 | sch->opm |= mask; | |
1353 | sch->lpm |= mask; | |
1354 | io_subchannel_verify(sch); | |
1355 | break; | |
1356 | case CHP_OFFLINE: | |
1357 | if (stsch(sch->schid, &sch->schib)) | |
1358 | return -ENXIO; | |
1359 | if (!css_sch_is_valid(&sch->schib)) | |
1360 | return -ENODEV; | |
1361 | io_subchannel_terminate_path(sch, mask); | |
1362 | break; | |
1363 | case CHP_ONLINE: | |
1364 | if (stsch(sch->schid, &sch->schib)) | |
1365 | return -ENXIO; | |
1366 | sch->lpm |= mask & sch->opm; | |
1367 | io_subchannel_verify(sch); | |
1368 | break; | |
1369 | } | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1da177e4 | 1373 | static void |
8bbace7e | 1374 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 1375 | { |
1da177e4 LT |
1376 | struct ccw_device *cdev; |
1377 | int ret; | |
1378 | ||
db6a6423 | 1379 | cdev = sch_get_cdev(sch); |
1da177e4 | 1380 | |
a8237fc4 | 1381 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
1382 | return; |
1383 | if (!sch->schib.pmcw.ena) | |
1384 | /* Nothing to do. */ | |
1385 | return; | |
1386 | ret = cio_disable_subchannel(sch); | |
1387 | if (ret != -EBUSY) | |
1388 | /* Subchannel is disabled, we're done. */ | |
1389 | return; | |
1390 | cdev->private->state = DEV_STATE_QUIESCE; | |
1391 | if (cdev->handler) | |
1392 | cdev->handler(cdev, cdev->private->intparm, | |
1393 | ERR_PTR(-EIO)); | |
1394 | ret = ccw_device_cancel_halt_clear(cdev); | |
1395 | if (ret == -EBUSY) { | |
1396 | ccw_device_set_timeout(cdev, HZ/10); | |
1397 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
1398 | } | |
1399 | cio_disable_subchannel(sch); | |
1400 | } | |
1401 | ||
c820de39 CH |
1402 | static int io_subchannel_get_status(struct subchannel *sch) |
1403 | { | |
1404 | struct schib schib; | |
1405 | ||
1406 | if (stsch(sch->schid, &schib) || !schib.pmcw.dnv) | |
1407 | return CIO_GONE; | |
1408 | if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev)) | |
1409 | return CIO_REVALIDATE; | |
1410 | if (!sch->lpm) | |
1411 | return CIO_NO_PATH; | |
1412 | return CIO_OPER; | |
1413 | } | |
1414 | ||
1415 | static int device_is_disconnected(struct ccw_device *cdev) | |
1416 | { | |
1417 | if (!cdev) | |
1418 | return 0; | |
1419 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
1420 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
1421 | } | |
1422 | ||
1423 | static int recovery_check(struct device *dev, void *data) | |
1424 | { | |
1425 | struct ccw_device *cdev = to_ccwdev(dev); | |
1426 | int *redo = data; | |
1427 | ||
1428 | spin_lock_irq(cdev->ccwlock); | |
1429 | switch (cdev->private->state) { | |
1430 | case DEV_STATE_DISCONNECTED: | |
1431 | CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", | |
1432 | cdev->private->dev_id.ssid, | |
1433 | cdev->private->dev_id.devno); | |
1434 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
1435 | *redo = 1; | |
1436 | break; | |
1437 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
1438 | *redo = 1; | |
1439 | break; | |
1440 | } | |
1441 | spin_unlock_irq(cdev->ccwlock); | |
1442 | ||
1443 | return 0; | |
1444 | } | |
1445 | ||
1446 | static void recovery_work_func(struct work_struct *unused) | |
1447 | { | |
1448 | int redo = 0; | |
1449 | ||
1450 | bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); | |
1451 | if (redo) { | |
1452 | spin_lock_irq(&recovery_lock); | |
1453 | if (!timer_pending(&recovery_timer)) { | |
1454 | if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) | |
1455 | recovery_phase++; | |
1456 | mod_timer(&recovery_timer, jiffies + | |
1457 | recovery_delay[recovery_phase] * HZ); | |
1458 | } | |
1459 | spin_unlock_irq(&recovery_lock); | |
1460 | } else | |
1461 | CIO_MSG_EVENT(4, "recovery: end\n"); | |
1462 | } | |
1463 | ||
1464 | static DECLARE_WORK(recovery_work, recovery_work_func); | |
1465 | ||
1466 | static void recovery_func(unsigned long data) | |
1467 | { | |
1468 | /* | |
1469 | * We can't do our recovery in softirq context and it's not | |
1470 | * performance critical, so we schedule it. | |
1471 | */ | |
1472 | schedule_work(&recovery_work); | |
1473 | } | |
1474 | ||
1475 | static void ccw_device_schedule_recovery(void) | |
1476 | { | |
1477 | unsigned long flags; | |
1478 | ||
1479 | CIO_MSG_EVENT(4, "recovery: schedule\n"); | |
1480 | spin_lock_irqsave(&recovery_lock, flags); | |
1481 | if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { | |
1482 | recovery_phase = 0; | |
1483 | mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); | |
1484 | } | |
1485 | spin_unlock_irqrestore(&recovery_lock, flags); | |
1486 | } | |
1487 | ||
1488 | static void device_set_disconnected(struct ccw_device *cdev) | |
1489 | { | |
1490 | if (!cdev) | |
1491 | return; | |
1492 | ccw_device_set_timeout(cdev, 0); | |
1493 | cdev->private->flags.fake_irb = 0; | |
1494 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
1495 | if (cdev->online) | |
1496 | ccw_device_schedule_recovery(); | |
1497 | } | |
1498 | ||
1499 | static int io_subchannel_sch_event(struct subchannel *sch, int slow) | |
1500 | { | |
1501 | int event, ret, disc; | |
1502 | unsigned long flags; | |
1503 | enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE } action; | |
1504 | struct ccw_device *cdev; | |
1505 | ||
1506 | spin_lock_irqsave(sch->lock, flags); | |
1507 | cdev = sch_get_cdev(sch); | |
1508 | disc = device_is_disconnected(cdev); | |
1509 | if (disc && slow) { | |
1510 | /* Disconnected devices are evaluated directly only.*/ | |
1511 | spin_unlock_irqrestore(sch->lock, flags); | |
1512 | return 0; | |
1513 | } | |
1514 | /* No interrupt after machine check - kill pending timers. */ | |
1515 | if (cdev) | |
1516 | ccw_device_set_timeout(cdev, 0); | |
1517 | if (!disc && !slow) { | |
1518 | /* Non-disconnected devices are evaluated on the slow path. */ | |
1519 | spin_unlock_irqrestore(sch->lock, flags); | |
1520 | return -EAGAIN; | |
1521 | } | |
1522 | event = io_subchannel_get_status(sch); | |
1523 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n", | |
1524 | sch->schid.ssid, sch->schid.sch_no, event, | |
1525 | disc ? "disconnected" : "normal", | |
1526 | slow ? "slow" : "fast"); | |
1527 | /* Analyze subchannel status. */ | |
1528 | action = NONE; | |
1529 | switch (event) { | |
1530 | case CIO_NO_PATH: | |
1531 | if (disc) { | |
1532 | /* Check if paths have become available. */ | |
1533 | action = REPROBE; | |
1534 | break; | |
1535 | } | |
1536 | /* fall through */ | |
1537 | case CIO_GONE: | |
1538 | /* Prevent unwanted effects when opening lock. */ | |
1539 | cio_disable_subchannel(sch); | |
1540 | device_set_disconnected(cdev); | |
1541 | /* Ask driver what to do with device. */ | |
1542 | action = UNREGISTER; | |
1543 | spin_unlock_irqrestore(sch->lock, flags); | |
1544 | ret = io_subchannel_notify(sch, event); | |
1545 | spin_lock_irqsave(sch->lock, flags); | |
1546 | if (ret) | |
1547 | action = NONE; | |
1548 | break; | |
1549 | case CIO_REVALIDATE: | |
1550 | /* Device will be removed, so no notify necessary. */ | |
1551 | if (disc) | |
1552 | /* Reprobe because immediate unregister might block. */ | |
1553 | action = REPROBE; | |
1554 | else | |
1555 | action = UNREGISTER_PROBE; | |
1556 | break; | |
1557 | case CIO_OPER: | |
1558 | if (disc) | |
1559 | /* Get device operational again. */ | |
1560 | action = REPROBE; | |
1561 | break; | |
1562 | } | |
1563 | /* Perform action. */ | |
1564 | ret = 0; | |
1565 | switch (action) { | |
1566 | case UNREGISTER: | |
1567 | case UNREGISTER_PROBE: | |
1568 | /* Unregister device (will use subchannel lock). */ | |
1569 | spin_unlock_irqrestore(sch->lock, flags); | |
1570 | css_sch_device_unregister(sch); | |
1571 | spin_lock_irqsave(sch->lock, flags); | |
1572 | ||
1573 | /* Reset intparm to zeroes. */ | |
1574 | sch->schib.pmcw.intparm = 0; | |
1575 | cio_modify(sch); | |
1576 | break; | |
1577 | case REPROBE: | |
1578 | ccw_device_trigger_reprobe(cdev); | |
1579 | break; | |
1580 | default: | |
1581 | break; | |
1582 | } | |
1583 | spin_unlock_irqrestore(sch->lock, flags); | |
1584 | /* Probe if necessary. */ | |
1585 | if (action == UNREGISTER_PROBE) | |
1586 | ret = css_probe_device(sch->schid); | |
1587 | ||
1588 | return ret; | |
1589 | } | |
1590 | ||
1da177e4 LT |
1591 | #ifdef CONFIG_CCW_CONSOLE |
1592 | static struct ccw_device console_cdev; | |
1593 | static struct ccw_device_private console_private; | |
1594 | static int console_cdev_in_use; | |
1595 | ||
2ec22984 CH |
1596 | static DEFINE_SPINLOCK(ccw_console_lock); |
1597 | ||
1598 | spinlock_t * cio_get_console_lock(void) | |
1599 | { | |
1600 | return &ccw_console_lock; | |
1601 | } | |
1602 | ||
0ae7a7b2 CH |
1603 | static int ccw_device_console_enable(struct ccw_device *cdev, |
1604 | struct subchannel *sch) | |
1da177e4 LT |
1605 | { |
1606 | int rc; | |
1607 | ||
cd6b4f27 CH |
1608 | /* Attach subchannel private data. */ |
1609 | sch->private = cio_get_console_priv(); | |
1610 | memset(sch->private, 0, sizeof(struct io_subchannel_private)); | |
0ae7a7b2 CH |
1611 | io_subchannel_init_fields(sch); |
1612 | sch->driver = &io_subchannel_driver; | |
1da177e4 | 1613 | /* Initialize the ccw_device structure. */ |
292888c8 | 1614 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1615 | rc = io_subchannel_recog(cdev, sch); |
1616 | if (rc) | |
1617 | return rc; | |
1618 | ||
1619 | /* Now wait for the async. recognition to come to an end. */ | |
1620 | spin_lock_irq(cdev->ccwlock); | |
1621 | while (!dev_fsm_final_state(cdev)) | |
1622 | wait_cons_dev(); | |
1623 | rc = -EIO; | |
1624 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1625 | goto out_unlock; | |
1626 | ccw_device_online(cdev); | |
1627 | while (!dev_fsm_final_state(cdev)) | |
1628 | wait_cons_dev(); | |
1629 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1630 | goto out_unlock; | |
1631 | rc = 0; | |
1632 | out_unlock: | |
1633 | spin_unlock_irq(cdev->ccwlock); | |
1634 | return 0; | |
1635 | } | |
1636 | ||
1637 | struct ccw_device * | |
1638 | ccw_device_probe_console(void) | |
1639 | { | |
1640 | struct subchannel *sch; | |
1641 | int ret; | |
1642 | ||
1643 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1644 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1645 | sch = cio_probe_console(); |
1646 | if (IS_ERR(sch)) { | |
1647 | console_cdev_in_use = 0; | |
1648 | return (void *) sch; | |
1649 | } | |
1650 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1651 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1652 | console_cdev.private = &console_private; | |
c1637532 | 1653 | console_private.cdev = &console_cdev; |
1da177e4 LT |
1654 | ret = ccw_device_console_enable(&console_cdev, sch); |
1655 | if (ret) { | |
1656 | cio_release_console(); | |
1657 | console_cdev_in_use = 0; | |
1658 | return ERR_PTR(ret); | |
1659 | } | |
1660 | console_cdev.online = 1; | |
1661 | return &console_cdev; | |
1662 | } | |
1663 | #endif | |
1664 | ||
1665 | /* | |
1666 | * get ccw_device matching the busid, but only if owned by cdrv | |
1667 | */ | |
b0744bd2 CH |
1668 | static int |
1669 | __ccwdev_check_busid(struct device *dev, void *id) | |
1670 | { | |
1671 | char *bus_id; | |
1672 | ||
12975aef | 1673 | bus_id = id; |
b0744bd2 CH |
1674 | |
1675 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); | |
1676 | } | |
1677 | ||
1678 | ||
b2ffd8e9 CH |
1679 | /** |
1680 | * get_ccwdev_by_busid() - obtain device from a bus id | |
1681 | * @cdrv: driver the device is owned by | |
1682 | * @bus_id: bus id of the device to be searched | |
1683 | * | |
1684 | * This function searches all devices owned by @cdrv for a device with a bus | |
1685 | * id matching @bus_id. | |
1686 | * Returns: | |
1687 | * If a match is found, its reference count of the found device is increased | |
1688 | * and it is returned; else %NULL is returned. | |
1689 | */ | |
1690 | struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, | |
1691 | const char *bus_id) | |
1da177e4 | 1692 | { |
b0744bd2 | 1693 | struct device *dev; |
1da177e4 LT |
1694 | struct device_driver *drv; |
1695 | ||
1696 | drv = get_driver(&cdrv->driver); | |
1697 | if (!drv) | |
b0744bd2 | 1698 | return NULL; |
1da177e4 | 1699 | |
b0744bd2 CH |
1700 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1701 | __ccwdev_check_busid); | |
1da177e4 LT |
1702 | put_driver(drv); |
1703 | ||
d2c993d8 | 1704 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1705 | } |
1706 | ||
1707 | /************************** device driver handling ************************/ | |
1708 | ||
1709 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1710 | * and release methods are initially very similar to the device_driver | |
1711 | * implementations, with the difference that they have ccw_device | |
1712 | * arguments. | |
1713 | * | |
1714 | * A ccw driver also contains the information that is needed for | |
1715 | * device matching. | |
1716 | */ | |
1717 | static int | |
1718 | ccw_device_probe (struct device *dev) | |
1719 | { | |
1720 | struct ccw_device *cdev = to_ccwdev(dev); | |
1721 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1722 | int ret; | |
1723 | ||
1724 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1725 | ||
1726 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1727 | ||
1728 | if (ret) { | |
d2c993d8 | 1729 | cdev->drv = NULL; |
1da177e4 LT |
1730 | return ret; |
1731 | } | |
1732 | ||
1733 | return 0; | |
1734 | } | |
1735 | ||
1736 | static int | |
1737 | ccw_device_remove (struct device *dev) | |
1738 | { | |
1739 | struct ccw_device *cdev = to_ccwdev(dev); | |
1740 | struct ccw_driver *cdrv = cdev->drv; | |
1741 | int ret; | |
1742 | ||
1da177e4 LT |
1743 | if (cdrv->remove) |
1744 | cdrv->remove(cdev); | |
1745 | if (cdev->online) { | |
1746 | cdev->online = 0; | |
1747 | spin_lock_irq(cdev->ccwlock); | |
1748 | ret = ccw_device_offline(cdev); | |
1749 | spin_unlock_irq(cdev->ccwlock); | |
1750 | if (ret == 0) | |
1751 | wait_event(cdev->private->wait_q, | |
1752 | dev_fsm_final_state(cdev)); | |
1753 | else | |
139b83dd | 1754 | CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " |
e556bbbd CH |
1755 | "device 0.%x.%04x\n", |
1756 | ret, cdev->private->dev_id.ssid, | |
1757 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1758 | } |
1759 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1760 | cdev->drv = NULL; |
1da177e4 LT |
1761 | return 0; |
1762 | } | |
1763 | ||
958974fb CH |
1764 | static void ccw_device_shutdown(struct device *dev) |
1765 | { | |
1766 | struct ccw_device *cdev; | |
1767 | ||
1768 | cdev = to_ccwdev(dev); | |
1769 | if (cdev->drv && cdev->drv->shutdown) | |
1770 | cdev->drv->shutdown(cdev); | |
1842f2b1 | 1771 | disable_cmf(cdev); |
958974fb CH |
1772 | } |
1773 | ||
8bbace7e CH |
1774 | struct bus_type ccw_bus_type = { |
1775 | .name = "ccw", | |
1776 | .match = ccw_bus_match, | |
1777 | .uevent = ccw_uevent, | |
1778 | .probe = ccw_device_probe, | |
1779 | .remove = ccw_device_remove, | |
958974fb | 1780 | .shutdown = ccw_device_shutdown, |
8bbace7e CH |
1781 | }; |
1782 | ||
b2ffd8e9 CH |
1783 | /** |
1784 | * ccw_driver_register() - register a ccw driver | |
1785 | * @cdriver: driver to be registered | |
1786 | * | |
1787 | * This function is mainly a wrapper around driver_register(). | |
1788 | * Returns: | |
1789 | * %0 on success and a negative error value on failure. | |
1790 | */ | |
1791 | int ccw_driver_register(struct ccw_driver *cdriver) | |
1da177e4 LT |
1792 | { |
1793 | struct device_driver *drv = &cdriver->driver; | |
1794 | ||
1795 | drv->bus = &ccw_bus_type; | |
1796 | drv->name = cdriver->name; | |
4beee646 | 1797 | drv->owner = cdriver->owner; |
1da177e4 LT |
1798 | |
1799 | return driver_register(drv); | |
1800 | } | |
1801 | ||
b2ffd8e9 CH |
1802 | /** |
1803 | * ccw_driver_unregister() - deregister a ccw driver | |
1804 | * @cdriver: driver to be deregistered | |
1805 | * | |
1806 | * This function is mainly a wrapper around driver_unregister(). | |
1807 | */ | |
1808 | void ccw_driver_unregister(struct ccw_driver *cdriver) | |
1da177e4 LT |
1809 | { |
1810 | driver_unregister(&cdriver->driver); | |
1811 | } | |
1812 | ||
a8237fc4 CH |
1813 | /* Helper func for qdio. */ |
1814 | struct subchannel_id | |
1815 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1816 | { | |
1817 | struct subchannel *sch; | |
1818 | ||
1819 | sch = to_subchannel(cdev->dev.parent); | |
1820 | return sch->schid; | |
1821 | } | |
1822 | ||
1da177e4 LT |
1823 | MODULE_LICENSE("GPL"); |
1824 | EXPORT_SYMBOL(ccw_device_set_online); | |
1825 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1826 | EXPORT_SYMBOL(ccw_driver_register); | |
1827 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1828 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1829 | EXPORT_SYMBOL(ccw_bus_type); | |
1830 | EXPORT_SYMBOL(ccw_device_work); | |
1831 | EXPORT_SYMBOL(ccw_device_notify_work); | |
a8237fc4 | 1832 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |