Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
4 | * $Revision: 1.131 $ | |
5 | * | |
6 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, | |
7 | * IBM Corporation | |
8 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
9 | * Cornelia Huck (cohuck@de.ibm.com) | |
10 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
11 | */ | |
12 | #include <linux/config.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/workqueue.h> | |
22 | ||
23 | #include <asm/ccwdev.h> | |
24 | #include <asm/cio.h> | |
4e57b681 | 25 | #include <asm/param.h> /* HZ */ |
1da177e4 LT |
26 | |
27 | #include "cio.h" | |
28 | #include "css.h" | |
29 | #include "device.h" | |
30 | #include "ioasm.h" | |
31 | ||
32 | /******************* bus type handling ***********************/ | |
33 | ||
34 | /* The Linux driver model distinguishes between a bus type and | |
35 | * the bus itself. Of course we only have one channel | |
36 | * subsystem driver and one channel system per machine, but | |
37 | * we still use the abstraction. T.R. says it's a good idea. */ | |
38 | static int | |
39 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
40 | { | |
41 | struct ccw_device *cdev = to_ccwdev(dev); | |
42 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
43 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
44 | ||
45 | if (!ids) | |
46 | return 0; | |
47 | ||
48 | found = ccw_device_id_match(ids, &cdev->id); | |
49 | if (!found) | |
50 | return 0; | |
51 | ||
52 | cdev->id.driver_info = found->driver_info; | |
53 | ||
54 | return 1; | |
55 | } | |
56 | ||
57 | /* | |
58 | * Hotplugging interface for ccw devices. | |
59 | * Heavily modeled on pci and usb hotplug. | |
60 | */ | |
61 | static int | |
62 | ccw_hotplug (struct device *dev, char **envp, int num_envp, | |
63 | char *buffer, int buffer_size) | |
64 | { | |
65 | struct ccw_device *cdev = to_ccwdev(dev); | |
66 | int i = 0; | |
67 | int length = 0; | |
68 | ||
69 | if (!cdev) | |
70 | return -ENODEV; | |
71 | ||
72 | /* what we want to pass to /sbin/hotplug */ | |
73 | ||
74 | envp[i++] = buffer; | |
75 | length += scnprintf(buffer, buffer_size - length, "CU_TYPE=%04X", | |
76 | cdev->id.cu_type); | |
77 | if ((buffer_size - length <= 0) || (i >= num_envp)) | |
78 | return -ENOMEM; | |
79 | ++length; | |
80 | buffer += length; | |
81 | ||
82 | envp[i++] = buffer; | |
83 | length += scnprintf(buffer, buffer_size - length, "CU_MODEL=%02X", | |
84 | cdev->id.cu_model); | |
85 | if ((buffer_size - length <= 0) || (i >= num_envp)) | |
86 | return -ENOMEM; | |
87 | ++length; | |
88 | buffer += length; | |
89 | ||
90 | /* The next two can be zero, that's ok for us */ | |
91 | envp[i++] = buffer; | |
92 | length += scnprintf(buffer, buffer_size - length, "DEV_TYPE=%04X", | |
93 | cdev->id.dev_type); | |
94 | if ((buffer_size - length <= 0) || (i >= num_envp)) | |
95 | return -ENOMEM; | |
96 | ++length; | |
97 | buffer += length; | |
98 | ||
99 | envp[i++] = buffer; | |
100 | length += scnprintf(buffer, buffer_size - length, "DEV_MODEL=%02X", | |
101 | cdev->id.dev_model); | |
102 | if ((buffer_size - length <= 0) || (i >= num_envp)) | |
103 | return -ENOMEM; | |
104 | ||
105 | envp[i] = 0; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | struct bus_type ccw_bus_type = { | |
111 | .name = "ccw", | |
112 | .match = &ccw_bus_match, | |
113 | .hotplug = &ccw_hotplug, | |
114 | }; | |
115 | ||
116 | static int io_subchannel_probe (struct device *); | |
117 | static int io_subchannel_remove (struct device *); | |
118 | void io_subchannel_irq (struct device *); | |
119 | static int io_subchannel_notify(struct device *, int); | |
120 | static void io_subchannel_verify(struct device *); | |
121 | static void io_subchannel_ioterm(struct device *); | |
122 | static void io_subchannel_shutdown(struct device *); | |
123 | ||
124 | struct css_driver io_subchannel_driver = { | |
125 | .subchannel_type = SUBCHANNEL_TYPE_IO, | |
126 | .drv = { | |
127 | .name = "io_subchannel", | |
128 | .bus = &css_bus_type, | |
129 | .probe = &io_subchannel_probe, | |
130 | .remove = &io_subchannel_remove, | |
131 | .shutdown = &io_subchannel_shutdown, | |
132 | }, | |
133 | .irq = io_subchannel_irq, | |
134 | .notify = io_subchannel_notify, | |
135 | .verify = io_subchannel_verify, | |
136 | .termination = io_subchannel_ioterm, | |
137 | }; | |
138 | ||
139 | struct workqueue_struct *ccw_device_work; | |
140 | struct workqueue_struct *ccw_device_notify_work; | |
141 | static wait_queue_head_t ccw_device_init_wq; | |
142 | static atomic_t ccw_device_init_count; | |
143 | ||
144 | static int __init | |
145 | init_ccw_bus_type (void) | |
146 | { | |
147 | int ret; | |
148 | ||
149 | init_waitqueue_head(&ccw_device_init_wq); | |
150 | atomic_set(&ccw_device_init_count, 0); | |
151 | ||
152 | ccw_device_work = create_singlethread_workqueue("cio"); | |
153 | if (!ccw_device_work) | |
154 | return -ENOMEM; /* FIXME: better errno ? */ | |
155 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); | |
156 | if (!ccw_device_notify_work) { | |
157 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
158 | goto out_err; | |
159 | } | |
160 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); | |
161 | if (!slow_path_wq) { | |
162 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
163 | goto out_err; | |
164 | } | |
165 | if ((ret = bus_register (&ccw_bus_type))) | |
166 | goto out_err; | |
167 | ||
168 | if ((ret = driver_register(&io_subchannel_driver.drv))) | |
169 | goto out_err; | |
170 | ||
171 | wait_event(ccw_device_init_wq, | |
172 | atomic_read(&ccw_device_init_count) == 0); | |
173 | flush_workqueue(ccw_device_work); | |
174 | return 0; | |
175 | out_err: | |
176 | if (ccw_device_work) | |
177 | destroy_workqueue(ccw_device_work); | |
178 | if (ccw_device_notify_work) | |
179 | destroy_workqueue(ccw_device_notify_work); | |
180 | if (slow_path_wq) | |
181 | destroy_workqueue(slow_path_wq); | |
182 | return ret; | |
183 | } | |
184 | ||
185 | static void __exit | |
186 | cleanup_ccw_bus_type (void) | |
187 | { | |
188 | driver_unregister(&io_subchannel_driver.drv); | |
189 | bus_unregister(&ccw_bus_type); | |
190 | destroy_workqueue(ccw_device_notify_work); | |
191 | destroy_workqueue(ccw_device_work); | |
192 | } | |
193 | ||
194 | subsys_initcall(init_ccw_bus_type); | |
195 | module_exit(cleanup_ccw_bus_type); | |
196 | ||
197 | /************************ device handling **************************/ | |
198 | ||
199 | /* | |
200 | * A ccw_device has some interfaces in sysfs in addition to the | |
201 | * standard ones. | |
202 | * The following entries are designed to export the information which | |
203 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
204 | * are obvious, so they don't have an entry :) | |
205 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
206 | */ | |
207 | static ssize_t | |
3fd3c0a5 | 208 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
209 | { |
210 | struct subchannel *sch = to_subchannel(dev); | |
211 | struct ssd_info *ssd = &sch->ssd_info; | |
212 | ssize_t ret = 0; | |
213 | int chp; | |
214 | ||
215 | for (chp = 0; chp < 8; chp++) | |
216 | ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]); | |
217 | ||
218 | ret += sprintf (buf+ret, "\n"); | |
219 | return min((ssize_t)PAGE_SIZE, ret); | |
220 | } | |
221 | ||
222 | static ssize_t | |
3fd3c0a5 | 223 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
224 | { |
225 | struct subchannel *sch = to_subchannel(dev); | |
226 | struct pmcw *pmcw = &sch->schib.pmcw; | |
227 | ||
228 | return sprintf (buf, "%02x %02x %02x\n", | |
229 | pmcw->pim, pmcw->pam, pmcw->pom); | |
230 | } | |
231 | ||
232 | static ssize_t | |
3fd3c0a5 | 233 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
234 | { |
235 | struct ccw_device *cdev = to_ccwdev(dev); | |
236 | struct ccw_device_id *id = &(cdev->id); | |
237 | ||
238 | if (id->dev_type != 0) | |
239 | return sprintf(buf, "%04x/%02x\n", | |
240 | id->dev_type, id->dev_model); | |
241 | else | |
242 | return sprintf(buf, "n/a\n"); | |
243 | } | |
244 | ||
245 | static ssize_t | |
3fd3c0a5 | 246 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
247 | { |
248 | struct ccw_device *cdev = to_ccwdev(dev); | |
249 | struct ccw_device_id *id = &(cdev->id); | |
250 | ||
251 | return sprintf(buf, "%04x/%02x\n", | |
252 | id->cu_type, id->cu_model); | |
253 | } | |
254 | ||
f1fc78a8 BB |
255 | static ssize_t |
256 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
257 | { | |
258 | struct ccw_device *cdev = to_ccwdev(dev); | |
259 | struct ccw_device_id *id = &(cdev->id); | |
260 | int ret; | |
261 | ||
262 | ret = sprintf(buf, "ccw:t%04Xm%02x", | |
263 | id->cu_type, id->cu_model); | |
264 | if (id->dev_type != 0) | |
265 | ret += sprintf(buf + ret, "dt%04Xdm%02X\n", | |
266 | id->dev_type, id->dev_model); | |
267 | else | |
268 | ret += sprintf(buf + ret, "dtdm\n"); | |
269 | return ret; | |
270 | } | |
271 | ||
1da177e4 | 272 | static ssize_t |
3fd3c0a5 | 273 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
274 | { |
275 | struct ccw_device *cdev = to_ccwdev(dev); | |
276 | ||
277 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
278 | } | |
279 | ||
280 | static void | |
281 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
282 | { | |
283 | struct subchannel *sch; | |
284 | /* | |
285 | * Forced offline in disconnected state means | |
286 | * 'throw away device'. | |
287 | */ | |
288 | sch = to_subchannel(cdev->dev.parent); | |
289 | device_unregister(&sch->dev); | |
290 | /* Reset intparm to zeroes. */ | |
291 | sch->schib.pmcw.intparm = 0; | |
292 | cio_modify(sch); | |
293 | put_device(&sch->dev); | |
294 | } | |
295 | ||
296 | int | |
297 | ccw_device_set_offline(struct ccw_device *cdev) | |
298 | { | |
299 | int ret; | |
300 | ||
301 | if (!cdev) | |
302 | return -ENODEV; | |
303 | if (!cdev->online || !cdev->drv) | |
304 | return -EINVAL; | |
305 | ||
306 | if (cdev->drv->set_offline) { | |
307 | ret = cdev->drv->set_offline(cdev); | |
308 | if (ret != 0) | |
309 | return ret; | |
310 | } | |
311 | cdev->online = 0; | |
312 | spin_lock_irq(cdev->ccwlock); | |
313 | ret = ccw_device_offline(cdev); | |
314 | if (ret == -ENODEV) { | |
315 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
316 | cdev->private->state = DEV_STATE_OFFLINE; | |
317 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
318 | } | |
319 | spin_unlock_irq(cdev->ccwlock); | |
320 | return ret; | |
321 | } | |
322 | spin_unlock_irq(cdev->ccwlock); | |
323 | if (ret == 0) | |
324 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
325 | else { | |
326 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
327 | ret, cdev->dev.bus_id); | |
328 | cdev->online = 1; | |
329 | } | |
330 | return ret; | |
331 | } | |
332 | ||
333 | int | |
334 | ccw_device_set_online(struct ccw_device *cdev) | |
335 | { | |
336 | int ret; | |
337 | ||
338 | if (!cdev) | |
339 | return -ENODEV; | |
340 | if (cdev->online || !cdev->drv) | |
341 | return -EINVAL; | |
342 | ||
343 | spin_lock_irq(cdev->ccwlock); | |
344 | ret = ccw_device_online(cdev); | |
345 | spin_unlock_irq(cdev->ccwlock); | |
346 | if (ret == 0) | |
347 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
348 | else { | |
349 | pr_debug("ccw_device_online returned %d, device %s\n", | |
350 | ret, cdev->dev.bus_id); | |
351 | return ret; | |
352 | } | |
353 | if (cdev->private->state != DEV_STATE_ONLINE) | |
354 | return -ENODEV; | |
355 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { | |
356 | cdev->online = 1; | |
357 | return 0; | |
358 | } | |
359 | spin_lock_irq(cdev->ccwlock); | |
360 | ret = ccw_device_offline(cdev); | |
361 | spin_unlock_irq(cdev->ccwlock); | |
362 | if (ret == 0) | |
363 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
364 | else | |
365 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
366 | ret, cdev->dev.bus_id); | |
367 | return (ret = 0) ? -ENODEV : ret; | |
368 | } | |
369 | ||
370 | static ssize_t | |
3fd3c0a5 | 371 | online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
372 | { |
373 | struct ccw_device *cdev = to_ccwdev(dev); | |
374 | int i, force, ret; | |
375 | char *tmp; | |
376 | ||
377 | if (atomic_compare_and_swap(0, 1, &cdev->private->onoff)) | |
378 | return -EAGAIN; | |
379 | ||
380 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
381 | atomic_set(&cdev->private->onoff, 0); | |
382 | return -EINVAL; | |
383 | } | |
384 | if (!strncmp(buf, "force\n", count)) { | |
385 | force = 1; | |
386 | i = 1; | |
387 | } else { | |
388 | force = 0; | |
389 | i = simple_strtoul(buf, &tmp, 16); | |
390 | } | |
391 | if (i == 1) { | |
392 | /* Do device recognition, if needed. */ | |
393 | if (cdev->id.cu_type == 0) { | |
394 | ret = ccw_device_recognition(cdev); | |
395 | if (ret) { | |
396 | printk(KERN_WARNING"Couldn't start recognition " | |
397 | "for device %s (ret=%d)\n", | |
398 | cdev->dev.bus_id, ret); | |
399 | goto out; | |
400 | } | |
401 | wait_event(cdev->private->wait_q, | |
402 | cdev->private->flags.recog_done); | |
403 | } | |
404 | if (cdev->drv && cdev->drv->set_online) | |
405 | ccw_device_set_online(cdev); | |
406 | } else if (i == 0) { | |
407 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
408 | ccw_device_remove_disconnected(cdev); | |
409 | else if (cdev->drv && cdev->drv->set_offline) | |
410 | ccw_device_set_offline(cdev); | |
411 | } | |
412 | if (force && cdev->private->state == DEV_STATE_BOXED) { | |
413 | ret = ccw_device_stlck(cdev); | |
414 | if (ret) { | |
415 | printk(KERN_WARNING"ccw_device_stlck for device %s " | |
416 | "returned %d!\n", cdev->dev.bus_id, ret); | |
417 | goto out; | |
418 | } | |
419 | /* Do device recognition, if needed. */ | |
420 | if (cdev->id.cu_type == 0) { | |
421 | cdev->private->state = DEV_STATE_NOT_OPER; | |
422 | ret = ccw_device_recognition(cdev); | |
423 | if (ret) { | |
424 | printk(KERN_WARNING"Couldn't start recognition " | |
425 | "for device %s (ret=%d)\n", | |
426 | cdev->dev.bus_id, ret); | |
427 | goto out; | |
428 | } | |
429 | wait_event(cdev->private->wait_q, | |
430 | cdev->private->flags.recog_done); | |
431 | } | |
432 | if (cdev->drv && cdev->drv->set_online) | |
433 | ccw_device_set_online(cdev); | |
434 | } | |
435 | out: | |
436 | if (cdev->drv) | |
437 | module_put(cdev->drv->owner); | |
438 | atomic_set(&cdev->private->onoff, 0); | |
439 | return count; | |
440 | } | |
441 | ||
442 | static ssize_t | |
3fd3c0a5 | 443 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
444 | { |
445 | struct ccw_device *cdev = to_ccwdev(dev); | |
446 | struct subchannel *sch; | |
447 | ||
448 | switch (cdev->private->state) { | |
449 | case DEV_STATE_BOXED: | |
450 | return sprintf(buf, "boxed\n"); | |
451 | case DEV_STATE_DISCONNECTED: | |
452 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
453 | case DEV_STATE_NOT_OPER: | |
454 | sch = to_subchannel(dev->parent); | |
455 | if (!sch->lpm) | |
456 | return sprintf(buf, "no path\n"); | |
457 | else | |
458 | return sprintf(buf, "no device\n"); | |
459 | default: | |
460 | /* All other states considered fine. */ | |
461 | return sprintf(buf, "good\n"); | |
462 | } | |
463 | } | |
464 | ||
465 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
466 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
467 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
468 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 469 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 LT |
470 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
471 | extern struct device_attribute dev_attr_cmb_enable; | |
472 | static DEVICE_ATTR(availability, 0444, available_show, NULL); | |
473 | ||
474 | static struct attribute * subch_attrs[] = { | |
475 | &dev_attr_chpids.attr, | |
476 | &dev_attr_pimpampom.attr, | |
477 | NULL, | |
478 | }; | |
479 | ||
480 | static struct attribute_group subch_attr_group = { | |
481 | .attrs = subch_attrs, | |
482 | }; | |
483 | ||
484 | static inline int | |
485 | subchannel_add_files (struct device *dev) | |
486 | { | |
487 | return sysfs_create_group(&dev->kobj, &subch_attr_group); | |
488 | } | |
489 | ||
490 | static struct attribute * ccwdev_attrs[] = { | |
491 | &dev_attr_devtype.attr, | |
492 | &dev_attr_cutype.attr, | |
f1fc78a8 | 493 | &dev_attr_modalias.attr, |
1da177e4 LT |
494 | &dev_attr_online.attr, |
495 | &dev_attr_cmb_enable.attr, | |
496 | &dev_attr_availability.attr, | |
497 | NULL, | |
498 | }; | |
499 | ||
500 | static struct attribute_group ccwdev_attr_group = { | |
501 | .attrs = ccwdev_attrs, | |
502 | }; | |
503 | ||
504 | static inline int | |
505 | device_add_files (struct device *dev) | |
506 | { | |
507 | return sysfs_create_group(&dev->kobj, &ccwdev_attr_group); | |
508 | } | |
509 | ||
510 | static inline void | |
511 | device_remove_files(struct device *dev) | |
512 | { | |
513 | sysfs_remove_group(&dev->kobj, &ccwdev_attr_group); | |
514 | } | |
515 | ||
516 | /* this is a simple abstraction for device_register that sets the | |
517 | * correct bus type and adds the bus specific files */ | |
518 | int | |
519 | ccw_device_register(struct ccw_device *cdev) | |
520 | { | |
521 | struct device *dev = &cdev->dev; | |
522 | int ret; | |
523 | ||
524 | dev->bus = &ccw_bus_type; | |
525 | ||
526 | if ((ret = device_add(dev))) | |
527 | return ret; | |
528 | ||
529 | set_bit(1, &cdev->private->registered); | |
530 | if ((ret = device_add_files(dev))) { | |
531 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
532 | device_del(dev); | |
533 | } | |
534 | return ret; | |
535 | } | |
536 | ||
b0744bd2 CH |
537 | struct match_data { |
538 | unsigned int devno; | |
539 | struct ccw_device * sibling; | |
540 | }; | |
541 | ||
542 | static int | |
543 | match_devno(struct device * dev, void * data) | |
544 | { | |
545 | struct match_data * d = (struct match_data *)data; | |
546 | struct ccw_device * cdev; | |
547 | ||
548 | cdev = to_ccwdev(dev); | |
549 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
550 | (cdev->private->devno == d->devno) && | |
551 | (cdev != d->sibling)) { | |
552 | cdev->private->state = DEV_STATE_NOT_OPER; | |
553 | return 1; | |
554 | } | |
555 | return 0; | |
556 | } | |
557 | ||
1da177e4 LT |
558 | static struct ccw_device * |
559 | get_disc_ccwdev_by_devno(unsigned int devno, struct ccw_device *sibling) | |
560 | { | |
1da177e4 | 561 | struct device *dev; |
b0744bd2 CH |
562 | struct match_data data = { |
563 | .devno = devno, | |
564 | .sibling = sibling, | |
565 | }; | |
1da177e4 | 566 | |
e5945b4f | 567 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 568 | |
b0744bd2 | 569 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
570 | } |
571 | ||
572 | static void | |
573 | ccw_device_add_changed(void *data) | |
574 | { | |
575 | ||
576 | struct ccw_device *cdev; | |
577 | ||
578 | cdev = (struct ccw_device *)data; | |
579 | if (device_add(&cdev->dev)) { | |
580 | put_device(&cdev->dev); | |
581 | return; | |
582 | } | |
583 | set_bit(1, &cdev->private->registered); | |
584 | if (device_add_files(&cdev->dev)) { | |
585 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
586 | device_unregister(&cdev->dev); | |
587 | } | |
588 | } | |
589 | ||
590 | extern int css_get_ssd_info(struct subchannel *sch); | |
591 | ||
592 | void | |
593 | ccw_device_do_unreg_rereg(void *data) | |
594 | { | |
595 | struct ccw_device *cdev; | |
596 | struct subchannel *sch; | |
597 | int need_rename; | |
598 | ||
599 | cdev = (struct ccw_device *)data; | |
600 | sch = to_subchannel(cdev->dev.parent); | |
601 | if (cdev->private->devno != sch->schib.pmcw.dev) { | |
602 | /* | |
603 | * The device number has changed. This is usually only when | |
604 | * a device has been detached under VM and then re-appeared | |
605 | * on another subchannel because of a different attachment | |
606 | * order than before. Ideally, we should should just switch | |
607 | * subchannels, but unfortunately, this is not possible with | |
608 | * the current implementation. | |
609 | * Instead, we search for the old subchannel for this device | |
610 | * number and deregister so there are no collisions with the | |
611 | * newly registered ccw_device. | |
612 | * FIXME: Find another solution so the block layer doesn't | |
613 | * get possibly sick... | |
614 | */ | |
615 | struct ccw_device *other_cdev; | |
616 | ||
617 | need_rename = 1; | |
618 | other_cdev = get_disc_ccwdev_by_devno(sch->schib.pmcw.dev, | |
619 | cdev); | |
620 | if (other_cdev) { | |
621 | struct subchannel *other_sch; | |
622 | ||
623 | other_sch = to_subchannel(other_cdev->dev.parent); | |
624 | if (get_device(&other_sch->dev)) { | |
625 | stsch(other_sch->irq, &other_sch->schib); | |
626 | if (other_sch->schib.pmcw.dnv) { | |
627 | other_sch->schib.pmcw.intparm = 0; | |
628 | cio_modify(other_sch); | |
629 | } | |
630 | device_unregister(&other_sch->dev); | |
631 | } | |
632 | } | |
633 | /* Update ssd info here. */ | |
634 | css_get_ssd_info(sch); | |
635 | cdev->private->devno = sch->schib.pmcw.dev; | |
636 | } else | |
637 | need_rename = 0; | |
638 | device_remove_files(&cdev->dev); | |
639 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
640 | device_del(&cdev->dev); | |
641 | if (need_rename) | |
642 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", | |
643 | sch->schib.pmcw.dev); | |
644 | PREPARE_WORK(&cdev->private->kick_work, | |
645 | ccw_device_add_changed, (void *)cdev); | |
646 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
647 | } | |
648 | ||
649 | static void | |
650 | ccw_device_release(struct device *dev) | |
651 | { | |
652 | struct ccw_device *cdev; | |
653 | ||
654 | cdev = to_ccwdev(dev); | |
655 | kfree(cdev->private); | |
656 | kfree(cdev); | |
657 | } | |
658 | ||
659 | /* | |
660 | * Register recognized device. | |
661 | */ | |
662 | static void | |
663 | io_subchannel_register(void *data) | |
664 | { | |
665 | struct ccw_device *cdev; | |
666 | struct subchannel *sch; | |
667 | int ret; | |
668 | unsigned long flags; | |
669 | ||
670 | cdev = (struct ccw_device *) data; | |
671 | sch = to_subchannel(cdev->dev.parent); | |
672 | ||
b0744bd2 | 673 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
1da177e4 LT |
674 | bus_rescan_devices(&ccw_bus_type); |
675 | goto out; | |
676 | } | |
677 | /* make it known to the system */ | |
678 | ret = ccw_device_register(cdev); | |
679 | if (ret) { | |
680 | printk (KERN_WARNING "%s: could not register %s\n", | |
681 | __func__, cdev->dev.bus_id); | |
682 | put_device(&cdev->dev); | |
683 | spin_lock_irqsave(&sch->lock, flags); | |
684 | sch->dev.driver_data = NULL; | |
685 | spin_unlock_irqrestore(&sch->lock, flags); | |
686 | kfree (cdev->private); | |
687 | kfree (cdev); | |
688 | put_device(&sch->dev); | |
689 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
690 | wake_up(&ccw_device_init_wq); | |
691 | return; | |
692 | } | |
693 | ||
694 | ret = subchannel_add_files(cdev->dev.parent); | |
695 | if (ret) | |
696 | printk(KERN_WARNING "%s: could not add attributes to %s\n", | |
697 | __func__, sch->dev.bus_id); | |
698 | put_device(&cdev->dev); | |
699 | out: | |
700 | cdev->private->flags.recog_done = 1; | |
701 | put_device(&sch->dev); | |
702 | wake_up(&cdev->private->wait_q); | |
703 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
704 | wake_up(&ccw_device_init_wq); | |
705 | } | |
706 | ||
707 | void | |
708 | ccw_device_call_sch_unregister(void *data) | |
709 | { | |
710 | struct ccw_device *cdev = data; | |
711 | struct subchannel *sch; | |
712 | ||
713 | sch = to_subchannel(cdev->dev.parent); | |
714 | device_unregister(&sch->dev); | |
715 | /* Reset intparm to zeroes. */ | |
716 | sch->schib.pmcw.intparm = 0; | |
717 | cio_modify(sch); | |
718 | put_device(&cdev->dev); | |
719 | put_device(&sch->dev); | |
720 | } | |
721 | ||
722 | /* | |
723 | * subchannel recognition done. Called from the state machine. | |
724 | */ | |
725 | void | |
726 | io_subchannel_recog_done(struct ccw_device *cdev) | |
727 | { | |
728 | struct subchannel *sch; | |
729 | ||
730 | if (css_init_done == 0) { | |
731 | cdev->private->flags.recog_done = 1; | |
732 | return; | |
733 | } | |
734 | switch (cdev->private->state) { | |
735 | case DEV_STATE_NOT_OPER: | |
736 | cdev->private->flags.recog_done = 1; | |
737 | /* Remove device found not operational. */ | |
738 | if (!get_device(&cdev->dev)) | |
739 | break; | |
740 | sch = to_subchannel(cdev->dev.parent); | |
741 | PREPARE_WORK(&cdev->private->kick_work, | |
742 | ccw_device_call_sch_unregister, (void *) cdev); | |
743 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
744 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
745 | wake_up(&ccw_device_init_wq); | |
746 | break; | |
747 | case DEV_STATE_BOXED: | |
748 | /* Device did not respond in time. */ | |
749 | case DEV_STATE_OFFLINE: | |
750 | /* | |
751 | * We can't register the device in interrupt context so | |
752 | * we schedule a work item. | |
753 | */ | |
754 | if (!get_device(&cdev->dev)) | |
755 | break; | |
756 | PREPARE_WORK(&cdev->private->kick_work, | |
757 | io_subchannel_register, (void *) cdev); | |
758 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
759 | break; | |
760 | } | |
761 | } | |
762 | ||
763 | static int | |
764 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
765 | { | |
766 | int rc; | |
767 | struct ccw_device_private *priv; | |
768 | ||
769 | sch->dev.driver_data = cdev; | |
770 | sch->driver = &io_subchannel_driver; | |
771 | cdev->ccwlock = &sch->lock; | |
772 | /* Init private data. */ | |
773 | priv = cdev->private; | |
774 | priv->devno = sch->schib.pmcw.dev; | |
775 | priv->irq = sch->irq; | |
776 | priv->state = DEV_STATE_NOT_OPER; | |
777 | INIT_LIST_HEAD(&priv->cmb_list); | |
778 | init_waitqueue_head(&priv->wait_q); | |
779 | init_timer(&priv->timer); | |
780 | ||
781 | /* Set an initial name for the device. */ | |
782 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", | |
783 | sch->schib.pmcw.dev); | |
784 | ||
785 | /* Increase counter of devices currently in recognition. */ | |
786 | atomic_inc(&ccw_device_init_count); | |
787 | ||
788 | /* Start async. device sensing. */ | |
789 | spin_lock_irq(&sch->lock); | |
790 | rc = ccw_device_recognition(cdev); | |
791 | spin_unlock_irq(&sch->lock); | |
792 | if (rc) { | |
793 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
794 | wake_up(&ccw_device_init_wq); | |
795 | } | |
796 | return rc; | |
797 | } | |
798 | ||
799 | static int | |
800 | io_subchannel_probe (struct device *pdev) | |
801 | { | |
802 | struct subchannel *sch; | |
803 | struct ccw_device *cdev; | |
804 | int rc; | |
805 | unsigned long flags; | |
806 | ||
807 | sch = to_subchannel(pdev); | |
808 | if (sch->dev.driver_data) { | |
809 | /* | |
810 | * This subchannel already has an associated ccw_device. | |
811 | * Register it and exit. This happens for all early | |
812 | * device, e.g. the console. | |
813 | */ | |
814 | cdev = sch->dev.driver_data; | |
815 | device_initialize(&cdev->dev); | |
816 | ccw_device_register(cdev); | |
817 | subchannel_add_files(&sch->dev); | |
818 | /* | |
819 | * Check if the device is already online. If it is | |
820 | * the reference count needs to be corrected | |
821 | * (see ccw_device_online and css_init_done for the | |
822 | * ugly details). | |
823 | */ | |
824 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
825 | cdev->private->state != DEV_STATE_OFFLINE && | |
826 | cdev->private->state != DEV_STATE_BOXED) | |
827 | get_device(&cdev->dev); | |
828 | return 0; | |
829 | } | |
830 | cdev = kmalloc (sizeof(*cdev), GFP_KERNEL); | |
831 | if (!cdev) | |
832 | return -ENOMEM; | |
833 | memset(cdev, 0, sizeof(struct ccw_device)); | |
834 | cdev->private = kmalloc(sizeof(struct ccw_device_private), | |
835 | GFP_KERNEL | GFP_DMA); | |
836 | if (!cdev->private) { | |
837 | kfree(cdev); | |
838 | return -ENOMEM; | |
839 | } | |
840 | memset(cdev->private, 0, sizeof(struct ccw_device_private)); | |
841 | atomic_set(&cdev->private->onoff, 0); | |
842 | cdev->dev = (struct device) { | |
843 | .parent = pdev, | |
844 | .release = ccw_device_release, | |
845 | }; | |
846 | INIT_LIST_HEAD(&cdev->private->kick_work.entry); | |
847 | /* Do first half of device_register. */ | |
848 | device_initialize(&cdev->dev); | |
849 | ||
850 | if (!get_device(&sch->dev)) { | |
851 | if (cdev->dev.release) | |
852 | cdev->dev.release(&cdev->dev); | |
853 | return -ENODEV; | |
854 | } | |
855 | ||
856 | rc = io_subchannel_recog(cdev, to_subchannel(pdev)); | |
857 | if (rc) { | |
858 | spin_lock_irqsave(&sch->lock, flags); | |
859 | sch->dev.driver_data = NULL; | |
860 | spin_unlock_irqrestore(&sch->lock, flags); | |
861 | if (cdev->dev.release) | |
862 | cdev->dev.release(&cdev->dev); | |
863 | } | |
864 | ||
865 | return rc; | |
866 | } | |
867 | ||
868 | static void | |
869 | ccw_device_unregister(void *data) | |
870 | { | |
871 | struct ccw_device *cdev; | |
872 | ||
873 | cdev = (struct ccw_device *)data; | |
874 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
875 | device_unregister(&cdev->dev); | |
876 | put_device(&cdev->dev); | |
877 | } | |
878 | ||
879 | static int | |
880 | io_subchannel_remove (struct device *dev) | |
881 | { | |
882 | struct ccw_device *cdev; | |
883 | unsigned long flags; | |
884 | ||
885 | if (!dev->driver_data) | |
886 | return 0; | |
887 | cdev = dev->driver_data; | |
888 | /* Set ccw device to not operational and drop reference. */ | |
889 | spin_lock_irqsave(cdev->ccwlock, flags); | |
890 | dev->driver_data = NULL; | |
891 | cdev->private->state = DEV_STATE_NOT_OPER; | |
892 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
893 | /* | |
894 | * Put unregistration on workqueue to avoid livelocks on the css bus | |
895 | * semaphore. | |
896 | */ | |
897 | if (get_device(&cdev->dev)) { | |
898 | PREPARE_WORK(&cdev->private->kick_work, | |
899 | ccw_device_unregister, (void *) cdev); | |
900 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
901 | } | |
902 | return 0; | |
903 | } | |
904 | ||
905 | static int | |
906 | io_subchannel_notify(struct device *dev, int event) | |
907 | { | |
908 | struct ccw_device *cdev; | |
909 | ||
910 | cdev = dev->driver_data; | |
911 | if (!cdev) | |
912 | return 0; | |
913 | if (!cdev->drv) | |
914 | return 0; | |
915 | if (!cdev->online) | |
916 | return 0; | |
917 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; | |
918 | } | |
919 | ||
920 | static void | |
921 | io_subchannel_verify(struct device *dev) | |
922 | { | |
923 | struct ccw_device *cdev; | |
924 | ||
925 | cdev = dev->driver_data; | |
926 | if (cdev) | |
927 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
928 | } | |
929 | ||
930 | static void | |
931 | io_subchannel_ioterm(struct device *dev) | |
932 | { | |
933 | struct ccw_device *cdev; | |
934 | ||
935 | cdev = dev->driver_data; | |
936 | if (!cdev) | |
937 | return; | |
938 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; | |
939 | if (cdev->handler) | |
940 | cdev->handler(cdev, cdev->private->intparm, | |
941 | ERR_PTR(-EIO)); | |
942 | } | |
943 | ||
944 | static void | |
945 | io_subchannel_shutdown(struct device *dev) | |
946 | { | |
947 | struct subchannel *sch; | |
948 | struct ccw_device *cdev; | |
949 | int ret; | |
950 | ||
951 | sch = to_subchannel(dev); | |
952 | cdev = dev->driver_data; | |
953 | ||
954 | if (cio_is_console(sch->irq)) | |
955 | return; | |
956 | if (!sch->schib.pmcw.ena) | |
957 | /* Nothing to do. */ | |
958 | return; | |
959 | ret = cio_disable_subchannel(sch); | |
960 | if (ret != -EBUSY) | |
961 | /* Subchannel is disabled, we're done. */ | |
962 | return; | |
963 | cdev->private->state = DEV_STATE_QUIESCE; | |
964 | if (cdev->handler) | |
965 | cdev->handler(cdev, cdev->private->intparm, | |
966 | ERR_PTR(-EIO)); | |
967 | ret = ccw_device_cancel_halt_clear(cdev); | |
968 | if (ret == -EBUSY) { | |
969 | ccw_device_set_timeout(cdev, HZ/10); | |
970 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
971 | } | |
972 | cio_disable_subchannel(sch); | |
973 | } | |
974 | ||
975 | #ifdef CONFIG_CCW_CONSOLE | |
976 | static struct ccw_device console_cdev; | |
977 | static struct ccw_device_private console_private; | |
978 | static int console_cdev_in_use; | |
979 | ||
980 | static int | |
981 | ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch) | |
982 | { | |
983 | int rc; | |
984 | ||
985 | /* Initialize the ccw_device structure. */ | |
986 | cdev->dev = (struct device) { | |
987 | .parent = &sch->dev, | |
988 | }; | |
989 | /* Initialize the subchannel structure */ | |
990 | sch->dev.parent = &css_bus_device; | |
991 | sch->dev.bus = &css_bus_type; | |
992 | ||
993 | rc = io_subchannel_recog(cdev, sch); | |
994 | if (rc) | |
995 | return rc; | |
996 | ||
997 | /* Now wait for the async. recognition to come to an end. */ | |
998 | spin_lock_irq(cdev->ccwlock); | |
999 | while (!dev_fsm_final_state(cdev)) | |
1000 | wait_cons_dev(); | |
1001 | rc = -EIO; | |
1002 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1003 | goto out_unlock; | |
1004 | ccw_device_online(cdev); | |
1005 | while (!dev_fsm_final_state(cdev)) | |
1006 | wait_cons_dev(); | |
1007 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1008 | goto out_unlock; | |
1009 | rc = 0; | |
1010 | out_unlock: | |
1011 | spin_unlock_irq(cdev->ccwlock); | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | struct ccw_device * | |
1016 | ccw_device_probe_console(void) | |
1017 | { | |
1018 | struct subchannel *sch; | |
1019 | int ret; | |
1020 | ||
1021 | if (xchg(&console_cdev_in_use, 1) != 0) | |
1022 | return NULL; | |
1023 | sch = cio_probe_console(); | |
1024 | if (IS_ERR(sch)) { | |
1025 | console_cdev_in_use = 0; | |
1026 | return (void *) sch; | |
1027 | } | |
1028 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1029 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1030 | console_cdev.private = &console_private; | |
1031 | ret = ccw_device_console_enable(&console_cdev, sch); | |
1032 | if (ret) { | |
1033 | cio_release_console(); | |
1034 | console_cdev_in_use = 0; | |
1035 | return ERR_PTR(ret); | |
1036 | } | |
1037 | console_cdev.online = 1; | |
1038 | return &console_cdev; | |
1039 | } | |
1040 | #endif | |
1041 | ||
1042 | /* | |
1043 | * get ccw_device matching the busid, but only if owned by cdrv | |
1044 | */ | |
b0744bd2 CH |
1045 | static int |
1046 | __ccwdev_check_busid(struct device *dev, void *id) | |
1047 | { | |
1048 | char *bus_id; | |
1049 | ||
1050 | bus_id = (char *)id; | |
1051 | ||
1052 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); | |
1053 | } | |
1054 | ||
1055 | ||
1da177e4 LT |
1056 | struct ccw_device * |
1057 | get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id) | |
1058 | { | |
b0744bd2 | 1059 | struct device *dev; |
1da177e4 LT |
1060 | struct device_driver *drv; |
1061 | ||
1062 | drv = get_driver(&cdrv->driver); | |
1063 | if (!drv) | |
b0744bd2 | 1064 | return NULL; |
1da177e4 | 1065 | |
b0744bd2 CH |
1066 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1067 | __ccwdev_check_busid); | |
1da177e4 LT |
1068 | put_driver(drv); |
1069 | ||
1070 | return dev ? to_ccwdev(dev) : 0; | |
1071 | } | |
1072 | ||
1073 | /************************** device driver handling ************************/ | |
1074 | ||
1075 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1076 | * and release methods are initially very similar to the device_driver | |
1077 | * implementations, with the difference that they have ccw_device | |
1078 | * arguments. | |
1079 | * | |
1080 | * A ccw driver also contains the information that is needed for | |
1081 | * device matching. | |
1082 | */ | |
1083 | static int | |
1084 | ccw_device_probe (struct device *dev) | |
1085 | { | |
1086 | struct ccw_device *cdev = to_ccwdev(dev); | |
1087 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1088 | int ret; | |
1089 | ||
1090 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1091 | ||
1092 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1093 | ||
1094 | if (ret) { | |
1095 | cdev->drv = 0; | |
1096 | return ret; | |
1097 | } | |
1098 | ||
1099 | return 0; | |
1100 | } | |
1101 | ||
1102 | static int | |
1103 | ccw_device_remove (struct device *dev) | |
1104 | { | |
1105 | struct ccw_device *cdev = to_ccwdev(dev); | |
1106 | struct ccw_driver *cdrv = cdev->drv; | |
1107 | int ret; | |
1108 | ||
1109 | pr_debug("removing device %s\n", cdev->dev.bus_id); | |
1110 | if (cdrv->remove) | |
1111 | cdrv->remove(cdev); | |
1112 | if (cdev->online) { | |
1113 | cdev->online = 0; | |
1114 | spin_lock_irq(cdev->ccwlock); | |
1115 | ret = ccw_device_offline(cdev); | |
1116 | spin_unlock_irq(cdev->ccwlock); | |
1117 | if (ret == 0) | |
1118 | wait_event(cdev->private->wait_q, | |
1119 | dev_fsm_final_state(cdev)); | |
1120 | else | |
1121 | //FIXME: we can't fail! | |
1122 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
1123 | ret, cdev->dev.bus_id); | |
1124 | } | |
1125 | ccw_device_set_timeout(cdev, 0); | |
1126 | cdev->drv = 0; | |
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | int | |
1131 | ccw_driver_register (struct ccw_driver *cdriver) | |
1132 | { | |
1133 | struct device_driver *drv = &cdriver->driver; | |
1134 | ||
1135 | drv->bus = &ccw_bus_type; | |
1136 | drv->name = cdriver->name; | |
1137 | drv->probe = ccw_device_probe; | |
1138 | drv->remove = ccw_device_remove; | |
1139 | ||
1140 | return driver_register(drv); | |
1141 | } | |
1142 | ||
1143 | void | |
1144 | ccw_driver_unregister (struct ccw_driver *cdriver) | |
1145 | { | |
1146 | driver_unregister(&cdriver->driver); | |
1147 | } | |
1148 | ||
1149 | MODULE_LICENSE("GPL"); | |
1150 | EXPORT_SYMBOL(ccw_device_set_online); | |
1151 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1152 | EXPORT_SYMBOL(ccw_driver_register); | |
1153 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1154 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1155 | EXPORT_SYMBOL(ccw_bus_type); | |
1156 | EXPORT_SYMBOL(ccw_device_work); | |
1157 | EXPORT_SYMBOL(ccw_device_notify_work); |