Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
dcbd16d5 | 2 | * driver for channel subsystem |
1da177e4 | 3 | * |
dcbd16d5 SO |
4 | * Copyright IBM Corp. 2002, 2009 |
5 | * | |
6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
7 | * Cornelia Huck (cornelia.huck@de.ibm.com) | |
1da177e4 | 8 | */ |
e6d5a428 ME |
9 | |
10 | #define KMSG_COMPONENT "cio" | |
11 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
12 | ||
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/list.h> | |
a55360df | 19 | #include <linux/reboot.h> |
dcbd16d5 | 20 | #include <linux/suspend.h> |
3a3fc29a | 21 | #include <asm/isc.h> |
f5daba1d | 22 | #include <asm/crw.h> |
1da177e4 LT |
23 | |
24 | #include "css.h" | |
25 | #include "cio.h" | |
26 | #include "cio_debug.h" | |
27 | #include "ioasm.h" | |
28 | #include "chsc.h" | |
40154b82 | 29 | #include "device.h" |
83b3370c | 30 | #include "idset.h" |
7ad6a249 | 31 | #include "chp.h" |
1da177e4 | 32 | |
1da177e4 | 33 | int css_init_done = 0; |
40154b82 | 34 | static int need_reprobe = 0; |
fb6958a5 | 35 | static int max_ssid = 0; |
1da177e4 | 36 | |
7c9f4e3a | 37 | struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1]; |
1da177e4 | 38 | |
4d284cac | 39 | int |
f97a56fb CH |
40 | for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) |
41 | { | |
42 | struct subchannel_id schid; | |
43 | int ret; | |
44 | ||
45 | init_subchannel_id(&schid); | |
46 | ret = -ENODEV; | |
47 | do { | |
fb6958a5 CH |
48 | do { |
49 | ret = fn(schid, data); | |
50 | if (ret) | |
51 | break; | |
52 | } while (schid.sch_no++ < __MAX_SUBCHANNEL); | |
53 | schid.sch_no = 0; | |
54 | } while (schid.ssid++ < max_ssid); | |
f97a56fb CH |
55 | return ret; |
56 | } | |
57 | ||
e82a1567 PO |
58 | struct cb_data { |
59 | void *data; | |
60 | struct idset *set; | |
61 | int (*fn_known_sch)(struct subchannel *, void *); | |
62 | int (*fn_unknown_sch)(struct subchannel_id, void *); | |
63 | }; | |
64 | ||
65 | static int call_fn_known_sch(struct device *dev, void *data) | |
66 | { | |
67 | struct subchannel *sch = to_subchannel(dev); | |
68 | struct cb_data *cb = data; | |
69 | int rc = 0; | |
70 | ||
71 | idset_sch_del(cb->set, sch->schid); | |
72 | if (cb->fn_known_sch) | |
73 | rc = cb->fn_known_sch(sch, cb->data); | |
74 | return rc; | |
75 | } | |
76 | ||
77 | static int call_fn_unknown_sch(struct subchannel_id schid, void *data) | |
78 | { | |
79 | struct cb_data *cb = data; | |
80 | int rc = 0; | |
81 | ||
82 | if (idset_sch_contains(cb->set, schid)) | |
83 | rc = cb->fn_unknown_sch(schid, cb->data); | |
84 | return rc; | |
85 | } | |
86 | ||
90ac24a5 SO |
87 | static int call_fn_all_sch(struct subchannel_id schid, void *data) |
88 | { | |
89 | struct cb_data *cb = data; | |
90 | struct subchannel *sch; | |
91 | int rc = 0; | |
92 | ||
93 | sch = get_subchannel_by_schid(schid); | |
94 | if (sch) { | |
95 | if (cb->fn_known_sch) | |
96 | rc = cb->fn_known_sch(sch, cb->data); | |
97 | put_device(&sch->dev); | |
98 | } else { | |
99 | if (cb->fn_unknown_sch) | |
100 | rc = cb->fn_unknown_sch(schid, cb->data); | |
101 | } | |
102 | ||
103 | return rc; | |
104 | } | |
105 | ||
e82a1567 PO |
106 | int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), |
107 | int (*fn_unknown)(struct subchannel_id, | |
108 | void *), void *data) | |
109 | { | |
110 | struct cb_data cb; | |
111 | int rc; | |
112 | ||
e82a1567 PO |
113 | cb.data = data; |
114 | cb.fn_known_sch = fn_known; | |
115 | cb.fn_unknown_sch = fn_unknown; | |
90ac24a5 SO |
116 | |
117 | cb.set = idset_sch_new(); | |
118 | if (!cb.set) | |
119 | /* fall back to brute force scanning in case of oom */ | |
120 | return for_each_subchannel(call_fn_all_sch, &cb); | |
121 | ||
122 | idset_fill(cb.set); | |
123 | ||
e82a1567 PO |
124 | /* Process registered subchannels. */ |
125 | rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); | |
126 | if (rc) | |
127 | goto out; | |
128 | /* Process unregistered subchannels. */ | |
129 | if (fn_unknown) | |
130 | rc = for_each_subchannel(call_fn_unknown_sch, &cb); | |
131 | out: | |
132 | idset_free(cb.set); | |
133 | ||
134 | return rc; | |
135 | } | |
136 | ||
1da177e4 | 137 | static struct subchannel * |
a8237fc4 | 138 | css_alloc_subchannel(struct subchannel_id schid) |
1da177e4 LT |
139 | { |
140 | struct subchannel *sch; | |
141 | int ret; | |
142 | ||
143 | sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA); | |
144 | if (sch == NULL) | |
145 | return ERR_PTR(-ENOMEM); | |
a8237fc4 | 146 | ret = cio_validate_subchannel (sch, schid); |
1da177e4 LT |
147 | if (ret < 0) { |
148 | kfree(sch); | |
149 | return ERR_PTR(ret); | |
150 | } | |
1da177e4 LT |
151 | return sch; |
152 | } | |
153 | ||
154 | static void | |
155 | css_free_subchannel(struct subchannel *sch) | |
156 | { | |
157 | if (sch) { | |
158 | /* Reset intparm to zeroes. */ | |
13952ec1 SO |
159 | sch->config.intparm = 0; |
160 | cio_commit_config(sch); | |
2ec22984 | 161 | kfree(sch->lock); |
1da177e4 LT |
162 | kfree(sch); |
163 | } | |
1da177e4 LT |
164 | } |
165 | ||
166 | static void | |
167 | css_subchannel_release(struct device *dev) | |
168 | { | |
169 | struct subchannel *sch; | |
170 | ||
171 | sch = to_subchannel(dev); | |
2ec22984 | 172 | if (!cio_is_console(sch->schid)) { |
1da73bc8 PO |
173 | /* Reset intparm to zeroes. */ |
174 | sch->config.intparm = 0; | |
175 | cio_commit_config(sch); | |
2ec22984 | 176 | kfree(sch->lock); |
1da177e4 | 177 | kfree(sch); |
2ec22984 | 178 | } |
1da177e4 LT |
179 | } |
180 | ||
07c6a338 | 181 | static int css_sch_device_register(struct subchannel *sch) |
6ab4879a CH |
182 | { |
183 | int ret; | |
184 | ||
185 | mutex_lock(&sch->reg_mutex); | |
ab6aae09 SO |
186 | if (cio_is_console(sch->schid)) |
187 | sch->dev.init_name = cio_get_console_sch_name(sch->schid); | |
188 | else | |
189 | dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, | |
190 | sch->schid.sch_no); | |
6ab4879a CH |
191 | ret = device_register(&sch->dev); |
192 | mutex_unlock(&sch->reg_mutex); | |
193 | return ret; | |
194 | } | |
195 | ||
44a1c19e CH |
196 | /** |
197 | * css_sch_device_unregister - unregister a subchannel | |
198 | * @sch: subchannel to be unregistered | |
199 | */ | |
6ab4879a CH |
200 | void css_sch_device_unregister(struct subchannel *sch) |
201 | { | |
202 | mutex_lock(&sch->reg_mutex); | |
ef60cd13 SO |
203 | if (device_is_registered(&sch->dev)) |
204 | device_unregister(&sch->dev); | |
6ab4879a CH |
205 | mutex_unlock(&sch->reg_mutex); |
206 | } | |
44a1c19e | 207 | EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
6ab4879a | 208 | |
7ad6a249 PO |
209 | static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) |
210 | { | |
211 | int i; | |
212 | int mask; | |
213 | ||
214 | memset(ssd, 0, sizeof(struct chsc_ssd_info)); | |
215 | ssd->path_mask = pmcw->pim; | |
216 | for (i = 0; i < 8; i++) { | |
217 | mask = 0x80 >> i; | |
218 | if (pmcw->pim & mask) { | |
219 | chp_id_init(&ssd->chpid[i]); | |
220 | ssd->chpid[i].id = pmcw->chpid[i]; | |
221 | } | |
222 | } | |
223 | } | |
224 | ||
225 | static void ssd_register_chpids(struct chsc_ssd_info *ssd) | |
226 | { | |
227 | int i; | |
228 | int mask; | |
229 | ||
230 | for (i = 0; i < 8; i++) { | |
231 | mask = 0x80 >> i; | |
232 | if (ssd->path_mask & mask) | |
233 | if (!chp_is_registered(ssd->chpid[i])) | |
234 | chp_new(ssd->chpid[i]); | |
235 | } | |
236 | } | |
237 | ||
238 | void css_update_ssd_info(struct subchannel *sch) | |
239 | { | |
240 | int ret; | |
241 | ||
242 | if (cio_is_console(sch->schid)) { | |
243 | /* Console is initialized too early for functions requiring | |
244 | * memory allocation. */ | |
245 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
246 | } else { | |
247 | ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); | |
248 | if (ret) | |
249 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
250 | ssd_register_chpids(&sch->ssd_info); | |
251 | } | |
252 | } | |
253 | ||
7e9db9ea CH |
254 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
255 | char *buf) | |
256 | { | |
257 | struct subchannel *sch = to_subchannel(dev); | |
258 | ||
259 | return sprintf(buf, "%01x\n", sch->st); | |
260 | } | |
261 | ||
262 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
263 | ||
264 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
265 | char *buf) | |
266 | { | |
267 | struct subchannel *sch = to_subchannel(dev); | |
268 | ||
269 | return sprintf(buf, "css:t%01X\n", sch->st); | |
270 | } | |
271 | ||
272 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); | |
273 | ||
274 | static struct attribute *subch_attrs[] = { | |
275 | &dev_attr_type.attr, | |
276 | &dev_attr_modalias.attr, | |
277 | NULL, | |
278 | }; | |
279 | ||
280 | static struct attribute_group subch_attr_group = { | |
281 | .attrs = subch_attrs, | |
282 | }; | |
283 | ||
284 | static struct attribute_group *default_subch_attr_groups[] = { | |
285 | &subch_attr_group, | |
286 | NULL, | |
287 | }; | |
288 | ||
7ad6a249 | 289 | static int css_register_subchannel(struct subchannel *sch) |
1da177e4 LT |
290 | { |
291 | int ret; | |
292 | ||
293 | /* Initialize the subchannel structure */ | |
7c9f4e3a | 294 | sch->dev.parent = &channel_subsystems[0]->device; |
1da177e4 LT |
295 | sch->dev.bus = &css_bus_type; |
296 | sch->dev.release = &css_subchannel_release; | |
7e9db9ea | 297 | sch->dev.groups = default_subch_attr_groups; |
5bf04b20 CH |
298 | /* |
299 | * We don't want to generate uevents for I/O subchannels that don't | |
300 | * have a working ccw device behind them since they will be | |
301 | * unregistered before they can be used anyway, so we delay the add | |
302 | * uevent until after device recognition was successful. | |
7e9db9ea CH |
303 | * Note that we suppress the uevent for all subchannel types; |
304 | * the subchannel driver can decide itself when it wants to inform | |
305 | * userspace of its existence. | |
5bf04b20 | 306 | */ |
f67f129e | 307 | dev_set_uevent_suppress(&sch->dev, 1); |
7ad6a249 | 308 | css_update_ssd_info(sch); |
1da177e4 | 309 | /* make it known to the system */ |
6ab4879a | 310 | ret = css_sch_device_register(sch); |
7674da77 | 311 | if (ret) { |
e556bbbd CH |
312 | CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n", |
313 | sch->schid.ssid, sch->schid.sch_no, ret); | |
7674da77 CH |
314 | return ret; |
315 | } | |
7e9db9ea CH |
316 | if (!sch->driver) { |
317 | /* | |
318 | * No driver matched. Generate the uevent now so that | |
319 | * a fitting driver module may be loaded based on the | |
320 | * modalias. | |
321 | */ | |
f67f129e | 322 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea CH |
323 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
324 | } | |
1da177e4 LT |
325 | return ret; |
326 | } | |
327 | ||
c820de39 | 328 | int css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
329 | { |
330 | int ret; | |
331 | struct subchannel *sch; | |
332 | ||
a8237fc4 | 333 | sch = css_alloc_subchannel(schid); |
1da177e4 LT |
334 | if (IS_ERR(sch)) |
335 | return PTR_ERR(sch); | |
336 | ret = css_register_subchannel(sch); | |
337 | if (ret) | |
338 | css_free_subchannel(sch); | |
339 | return ret; | |
340 | } | |
341 | ||
b0744bd2 CH |
342 | static int |
343 | check_subchannel(struct device * dev, void * data) | |
344 | { | |
345 | struct subchannel *sch; | |
a8237fc4 | 346 | struct subchannel_id *schid = data; |
b0744bd2 CH |
347 | |
348 | sch = to_subchannel(dev); | |
a8237fc4 | 349 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
350 | } |
351 | ||
1da177e4 | 352 | struct subchannel * |
a8237fc4 | 353 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 354 | { |
1da177e4 LT |
355 | struct device *dev; |
356 | ||
b0744bd2 | 357 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 358 | &schid, check_subchannel); |
1da177e4 | 359 | |
b0744bd2 | 360 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
361 | } |
362 | ||
b279a4f5 CH |
363 | /** |
364 | * css_sch_is_valid() - check if a subchannel is valid | |
365 | * @schib: subchannel information block for the subchannel | |
366 | */ | |
367 | int css_sch_is_valid(struct schib *schib) | |
368 | { | |
369 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) | |
370 | return 0; | |
b3a686f4 CH |
371 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) |
372 | return 0; | |
b279a4f5 CH |
373 | return 1; |
374 | } | |
375 | EXPORT_SYMBOL_GPL(css_sch_is_valid); | |
376 | ||
564337f3 PO |
377 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) |
378 | { | |
379 | struct schib schib; | |
380 | ||
381 | if (!slow) { | |
382 | /* Will be done on the slow path. */ | |
383 | return -EAGAIN; | |
384 | } | |
b279a4f5 | 385 | if (stsch_err(schid, &schib) || !css_sch_is_valid(&schib)) { |
564337f3 PO |
386 | /* Unusable - ignore. */ |
387 | return 0; | |
1da177e4 | 388 | } |
564337f3 PO |
389 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, " |
390 | "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER); | |
391 | ||
392 | return css_probe_device(schid); | |
393 | } | |
394 | ||
c820de39 CH |
395 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) |
396 | { | |
397 | int ret = 0; | |
398 | ||
399 | if (sch->driver) { | |
400 | if (sch->driver->sch_event) | |
401 | ret = sch->driver->sch_event(sch, slow); | |
402 | else | |
403 | dev_dbg(&sch->dev, | |
404 | "Got subchannel machine check but " | |
405 | "no sch_event handler provided.\n"); | |
406 | } | |
407 | return ret; | |
408 | } | |
409 | ||
83b3370c | 410 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
411 | { |
412 | struct subchannel *sch; | |
413 | int ret; | |
414 | ||
415 | sch = get_subchannel_by_schid(schid); | |
416 | if (sch) { | |
417 | ret = css_evaluate_known_subchannel(sch, slow); | |
418 | put_device(&sch->dev); | |
419 | } else | |
420 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
421 | if (ret == -EAGAIN) |
422 | css_schedule_eval(schid); | |
1da177e4 LT |
423 | } |
424 | ||
83b3370c PO |
425 | static struct idset *slow_subchannel_set; |
426 | static spinlock_t slow_subchannel_lock; | |
427 | ||
428 | static int __init slow_subchannel_init(void) | |
1da177e4 | 429 | { |
83b3370c PO |
430 | spin_lock_init(&slow_subchannel_lock); |
431 | slow_subchannel_set = idset_sch_new(); | |
432 | if (!slow_subchannel_set) { | |
e556bbbd | 433 | CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); |
83b3370c PO |
434 | return -ENOMEM; |
435 | } | |
436 | return 0; | |
1da177e4 LT |
437 | } |
438 | ||
e82a1567 | 439 | static int slow_eval_known_fn(struct subchannel *sch, void *data) |
1da177e4 | 440 | { |
e82a1567 PO |
441 | int eval; |
442 | int rc; | |
1da177e4 LT |
443 | |
444 | spin_lock_irq(&slow_subchannel_lock); | |
e82a1567 PO |
445 | eval = idset_sch_contains(slow_subchannel_set, sch->schid); |
446 | idset_sch_del(slow_subchannel_set, sch->schid); | |
447 | spin_unlock_irq(&slow_subchannel_lock); | |
448 | if (eval) { | |
449 | rc = css_evaluate_known_subchannel(sch, 1); | |
450 | if (rc == -EAGAIN) | |
451 | css_schedule_eval(sch->schid); | |
1da177e4 | 452 | } |
e82a1567 PO |
453 | return 0; |
454 | } | |
455 | ||
456 | static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) | |
457 | { | |
458 | int eval; | |
459 | int rc = 0; | |
460 | ||
461 | spin_lock_irq(&slow_subchannel_lock); | |
462 | eval = idset_sch_contains(slow_subchannel_set, schid); | |
463 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 464 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
465 | if (eval) { |
466 | rc = css_evaluate_new_subchannel(schid, 1); | |
467 | switch (rc) { | |
468 | case -EAGAIN: | |
469 | css_schedule_eval(schid); | |
470 | rc = 0; | |
471 | break; | |
472 | case -ENXIO: | |
473 | case -ENOMEM: | |
474 | case -EIO: | |
475 | /* These should abort looping */ | |
476 | break; | |
477 | default: | |
478 | rc = 0; | |
479 | } | |
480 | } | |
481 | return rc; | |
482 | } | |
483 | ||
484 | static void css_slow_path_func(struct work_struct *unused) | |
485 | { | |
486 | CIO_TRACE_EVENT(4, "slowpath"); | |
487 | for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, | |
488 | NULL); | |
1da177e4 LT |
489 | } |
490 | ||
83b3370c | 491 | static DECLARE_WORK(slow_path_work, css_slow_path_func); |
1da177e4 LT |
492 | struct workqueue_struct *slow_path_wq; |
493 | ||
83b3370c PO |
494 | void css_schedule_eval(struct subchannel_id schid) |
495 | { | |
496 | unsigned long flags; | |
497 | ||
498 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
499 | idset_sch_add(slow_subchannel_set, schid); | |
500 | queue_work(slow_path_wq, &slow_path_work); | |
501 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
502 | } | |
503 | ||
504 | void css_schedule_eval_all(void) | |
505 | { | |
506 | unsigned long flags; | |
507 | ||
508 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
509 | idset_fill(slow_subchannel_set); | |
510 | queue_work(slow_path_wq, &slow_path_work); | |
511 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
512 | } | |
513 | ||
22806dc1 CH |
514 | void css_wait_for_slow_path(void) |
515 | { | |
22806dc1 CH |
516 | flush_workqueue(slow_path_wq); |
517 | } | |
518 | ||
40154b82 PO |
519 | /* Reprobe subchannel if unregistered. */ |
520 | static int reprobe_subchannel(struct subchannel_id schid, void *data) | |
521 | { | |
40154b82 PO |
522 | int ret; |
523 | ||
e556bbbd CH |
524 | CIO_MSG_EVENT(6, "cio: reprobe 0.%x.%04x\n", |
525 | schid.ssid, schid.sch_no); | |
40154b82 PO |
526 | if (need_reprobe) |
527 | return -EAGAIN; | |
528 | ||
40154b82 PO |
529 | ret = css_probe_device(schid); |
530 | switch (ret) { | |
531 | case 0: | |
532 | break; | |
533 | case -ENXIO: | |
534 | case -ENOMEM: | |
67175616 | 535 | case -EIO: |
40154b82 PO |
536 | /* These should abort looping */ |
537 | break; | |
538 | default: | |
539 | ret = 0; | |
540 | } | |
541 | ||
542 | return ret; | |
543 | } | |
544 | ||
56e25e97 PO |
545 | static void reprobe_after_idle(struct work_struct *unused) |
546 | { | |
547 | /* Make sure initial subchannel scan is done. */ | |
548 | wait_event(ccw_device_init_wq, | |
549 | atomic_read(&ccw_device_init_count) == 0); | |
550 | if (need_reprobe) | |
551 | css_schedule_reprobe(); | |
552 | } | |
553 | ||
554 | static DECLARE_WORK(reprobe_idle_work, reprobe_after_idle); | |
555 | ||
40154b82 | 556 | /* Work function used to reprobe all unregistered subchannels. */ |
4927b3f7 | 557 | static void reprobe_all(struct work_struct *unused) |
40154b82 PO |
558 | { |
559 | int ret; | |
560 | ||
139b83dd | 561 | CIO_MSG_EVENT(4, "reprobe start\n"); |
40154b82 | 562 | |
40154b82 | 563 | /* Make sure initial subchannel scan is done. */ |
56e25e97 PO |
564 | if (atomic_read(&ccw_device_init_count) != 0) { |
565 | queue_work(ccw_device_work, &reprobe_idle_work); | |
566 | return; | |
567 | } | |
568 | need_reprobe = 0; | |
e82a1567 | 569 | ret = for_each_subchannel_staged(NULL, reprobe_subchannel, NULL); |
40154b82 | 570 | |
139b83dd | 571 | CIO_MSG_EVENT(4, "reprobe done (rc=%d, need_reprobe=%d)\n", ret, |
40154b82 PO |
572 | need_reprobe); |
573 | } | |
574 | ||
2b67fc46 | 575 | static DECLARE_WORK(css_reprobe_work, reprobe_all); |
40154b82 PO |
576 | |
577 | /* Schedule reprobing of all unregistered subchannels. */ | |
578 | void css_schedule_reprobe(void) | |
579 | { | |
580 | need_reprobe = 1; | |
c5d4a999 | 581 | queue_work(slow_path_wq, &css_reprobe_work); |
40154b82 PO |
582 | } |
583 | ||
584 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); | |
585 | ||
1da177e4 LT |
586 | /* |
587 | * Called from the machine check handler for subchannel report words. | |
588 | */ | |
c1156189 | 589 | static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
1da177e4 | 590 | { |
a8237fc4 | 591 | struct subchannel_id mchk_schid; |
1da177e4 | 592 | |
c1156189 CH |
593 | if (overflow) { |
594 | css_schedule_eval_all(); | |
595 | return; | |
596 | } | |
597 | CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " | |
598 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
599 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
600 | crw0->erc, crw0->rsid); | |
601 | if (crw1) | |
602 | CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " | |
603 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
604 | crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, | |
605 | crw1->anc, crw1->erc, crw1->rsid); | |
a8237fc4 | 606 | init_subchannel_id(&mchk_schid); |
c1156189 CH |
607 | mchk_schid.sch_no = crw0->rsid; |
608 | if (crw1) | |
609 | mchk_schid.ssid = (crw1->rsid >> 8) & 3; | |
fb6958a5 | 610 | |
c1156189 | 611 | /* |
1da177e4 LT |
612 | * Since we are always presented with IPI in the CRW, we have to |
613 | * use stsch() to find out if the subchannel in question has come | |
614 | * or gone. | |
615 | */ | |
83b3370c | 616 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
617 | } |
618 | ||
f97a56fb CH |
619 | static int __init |
620 | __init_channel_subsystem(struct subchannel_id schid, void *data) | |
621 | { | |
622 | struct subchannel *sch; | |
623 | int ret; | |
624 | ||
625 | if (cio_is_console(schid)) | |
626 | sch = cio_get_console_subchannel(); | |
627 | else { | |
628 | sch = css_alloc_subchannel(schid); | |
629 | if (IS_ERR(sch)) | |
630 | ret = PTR_ERR(sch); | |
631 | else | |
632 | ret = 0; | |
633 | switch (ret) { | |
634 | case 0: | |
635 | break; | |
636 | case -ENOMEM: | |
637 | panic("Out of memory in init_channel_subsystem\n"); | |
638 | /* -ENXIO: no more subchannels. */ | |
639 | case -ENXIO: | |
640 | return ret; | |
e843e280 GS |
641 | /* -EIO: this subchannel set not supported. */ |
642 | case -EIO: | |
643 | return ret; | |
f97a56fb CH |
644 | default: |
645 | return 0; | |
646 | } | |
647 | } | |
648 | /* | |
649 | * We register ALL valid subchannels in ioinfo, even those | |
650 | * that have been present before init_channel_subsystem. | |
651 | * These subchannels can't have been registered yet (kmalloc | |
652 | * not working) so we do it now. This is true e.g. for the | |
653 | * console subchannel. | |
654 | */ | |
655 | css_register_subchannel(sch); | |
656 | return 0; | |
657 | } | |
658 | ||
1da177e4 | 659 | static void __init |
a28c6944 | 660 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 661 | { |
75784c00 | 662 | if (css_general_characteristics.mcss) { |
a28c6944 CH |
663 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
664 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
665 | } else { | |
1da177e4 | 666 | #ifdef CONFIG_SMP |
7b468488 | 667 | css->global_pgid.pgid_high.cpu_addr = stap(); |
1da177e4 | 668 | #else |
a28c6944 | 669 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
670 | #endif |
671 | } | |
a28c6944 CH |
672 | css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident; |
673 | css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine; | |
674 | css->global_pgid.tod_high = tod_high; | |
675 | ||
676 | } | |
677 | ||
3b793060 CH |
678 | static void |
679 | channel_subsystem_release(struct device *dev) | |
680 | { | |
681 | struct channel_subsystem *css; | |
682 | ||
683 | css = to_css(dev); | |
495a5b45 | 684 | mutex_destroy(&css->mutex); |
a2164b81 CH |
685 | if (css->pseudo_subchannel) { |
686 | /* Implies that it has been generated but never registered. */ | |
687 | css_subchannel_release(&css->pseudo_subchannel->dev); | |
688 | css->pseudo_subchannel = NULL; | |
689 | } | |
3b793060 CH |
690 | kfree(css); |
691 | } | |
692 | ||
495a5b45 CH |
693 | static ssize_t |
694 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
695 | char *buf) | |
696 | { | |
697 | struct channel_subsystem *css = to_css(dev); | |
8284fb19 | 698 | int ret; |
495a5b45 CH |
699 | |
700 | if (!css) | |
701 | return 0; | |
8284fb19 ME |
702 | mutex_lock(&css->mutex); |
703 | ret = sprintf(buf, "%x\n", css->cm_enabled); | |
704 | mutex_unlock(&css->mutex); | |
705 | return ret; | |
495a5b45 CH |
706 | } |
707 | ||
708 | static ssize_t | |
709 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
710 | const char *buf, size_t count) | |
711 | { | |
712 | struct channel_subsystem *css = to_css(dev); | |
713 | int ret; | |
2f972202 | 714 | unsigned long val; |
495a5b45 | 715 | |
2f972202 CH |
716 | ret = strict_strtoul(buf, 16, &val); |
717 | if (ret) | |
718 | return ret; | |
8284fb19 | 719 | mutex_lock(&css->mutex); |
2f972202 CH |
720 | switch (val) { |
721 | case 0: | |
495a5b45 CH |
722 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; |
723 | break; | |
2f972202 | 724 | case 1: |
495a5b45 CH |
725 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); |
726 | break; | |
727 | default: | |
728 | ret = -EINVAL; | |
729 | } | |
8284fb19 | 730 | mutex_unlock(&css->mutex); |
495a5b45 CH |
731 | return ret < 0 ? ret : count; |
732 | } | |
733 | ||
734 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
735 | ||
4d284cac | 736 | static int __init setup_css(int nr) |
a28c6944 CH |
737 | { |
738 | u32 tod_high; | |
d7b5a4c9 | 739 | int ret; |
7c9f4e3a | 740 | struct channel_subsystem *css; |
a28c6944 | 741 | |
7c9f4e3a CH |
742 | css = channel_subsystems[nr]; |
743 | memset(css, 0, sizeof(struct channel_subsystem)); | |
744 | css->pseudo_subchannel = | |
745 | kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL); | |
746 | if (!css->pseudo_subchannel) | |
d7b5a4c9 | 747 | return -ENOMEM; |
7c9f4e3a CH |
748 | css->pseudo_subchannel->dev.parent = &css->device; |
749 | css->pseudo_subchannel->dev.release = css_subchannel_release; | |
1bf5b285 | 750 | dev_set_name(&css->pseudo_subchannel->dev, "defunct"); |
7c9f4e3a | 751 | ret = cio_create_sch_lock(css->pseudo_subchannel); |
d7b5a4c9 | 752 | if (ret) { |
7c9f4e3a | 753 | kfree(css->pseudo_subchannel); |
d7b5a4c9 CH |
754 | return ret; |
755 | } | |
7c9f4e3a CH |
756 | mutex_init(&css->mutex); |
757 | css->valid = 1; | |
758 | css->cssid = nr; | |
1bf5b285 | 759 | dev_set_name(&css->device, "css%x", nr); |
7c9f4e3a | 760 | css->device.release = channel_subsystem_release; |
a28c6944 | 761 | tod_high = (u32) (get_clock() >> 32); |
7c9f4e3a | 762 | css_generate_pgid(css, tod_high); |
d7b5a4c9 | 763 | return 0; |
1da177e4 LT |
764 | } |
765 | ||
a55360df CH |
766 | static int css_reboot_event(struct notifier_block *this, |
767 | unsigned long event, | |
768 | void *ptr) | |
769 | { | |
770 | int ret, i; | |
771 | ||
772 | ret = NOTIFY_DONE; | |
773 | for (i = 0; i <= __MAX_CSSID; i++) { | |
774 | struct channel_subsystem *css; | |
775 | ||
776 | css = channel_subsystems[i]; | |
8284fb19 | 777 | mutex_lock(&css->mutex); |
a55360df CH |
778 | if (css->cm_enabled) |
779 | if (chsc_secm(css, 0)) | |
780 | ret = NOTIFY_BAD; | |
8284fb19 | 781 | mutex_unlock(&css->mutex); |
a55360df CH |
782 | } |
783 | ||
784 | return ret; | |
785 | } | |
786 | ||
787 | static struct notifier_block css_reboot_notifier = { | |
788 | .notifier_call = css_reboot_event, | |
789 | }; | |
790 | ||
dcbd16d5 SO |
791 | /* |
792 | * Since the css devices are neither on a bus nor have a class | |
793 | * nor have a special device type, we cannot stop/restart channel | |
794 | * path measurements via the normal suspend/resume callbacks, but have | |
795 | * to use notifiers. | |
796 | */ | |
797 | static int css_power_event(struct notifier_block *this, unsigned long event, | |
798 | void *ptr) | |
799 | { | |
800 | void *secm_area; | |
801 | int ret, i; | |
802 | ||
803 | switch (event) { | |
804 | case PM_HIBERNATION_PREPARE: | |
805 | case PM_SUSPEND_PREPARE: | |
806 | ret = NOTIFY_DONE; | |
807 | for (i = 0; i <= __MAX_CSSID; i++) { | |
808 | struct channel_subsystem *css; | |
809 | ||
810 | css = channel_subsystems[i]; | |
811 | mutex_lock(&css->mutex); | |
812 | if (!css->cm_enabled) { | |
813 | mutex_unlock(&css->mutex); | |
814 | continue; | |
815 | } | |
816 | secm_area = (void *)get_zeroed_page(GFP_KERNEL | | |
817 | GFP_DMA); | |
818 | if (secm_area) { | |
819 | if (__chsc_do_secm(css, 0, secm_area)) | |
820 | ret = NOTIFY_BAD; | |
821 | free_page((unsigned long)secm_area); | |
822 | } else | |
823 | ret = NOTIFY_BAD; | |
824 | ||
825 | mutex_unlock(&css->mutex); | |
826 | } | |
827 | break; | |
828 | case PM_POST_HIBERNATION: | |
829 | case PM_POST_SUSPEND: | |
830 | ret = NOTIFY_DONE; | |
831 | for (i = 0; i <= __MAX_CSSID; i++) { | |
832 | struct channel_subsystem *css; | |
833 | ||
834 | css = channel_subsystems[i]; | |
835 | mutex_lock(&css->mutex); | |
836 | if (!css->cm_enabled) { | |
837 | mutex_unlock(&css->mutex); | |
838 | continue; | |
839 | } | |
840 | secm_area = (void *)get_zeroed_page(GFP_KERNEL | | |
841 | GFP_DMA); | |
842 | if (secm_area) { | |
843 | if (__chsc_do_secm(css, 1, secm_area)) | |
844 | ret = NOTIFY_BAD; | |
845 | free_page((unsigned long)secm_area); | |
846 | } else | |
847 | ret = NOTIFY_BAD; | |
848 | ||
849 | mutex_unlock(&css->mutex); | |
850 | } | |
851 | /* search for subchannels, which appeared during hibernation */ | |
852 | css_schedule_reprobe(); | |
853 | break; | |
854 | default: | |
855 | ret = NOTIFY_DONE; | |
856 | } | |
857 | return ret; | |
858 | ||
859 | } | |
860 | static struct notifier_block css_power_notifier = { | |
861 | .notifier_call = css_power_event, | |
862 | }; | |
863 | ||
1da177e4 LT |
864 | /* |
865 | * Now that the driver core is running, we can setup our channel subsystem. | |
866 | * The struct subchannel's are created during probing (except for the | |
867 | * static console subchannel). | |
868 | */ | |
869 | static int __init | |
870 | init_channel_subsystem (void) | |
871 | { | |
a28c6944 | 872 | int ret, i; |
1da177e4 | 873 | |
4434a38c CH |
874 | ret = chsc_determine_css_characteristics(); |
875 | if (ret == -ENOMEM) | |
876 | goto out; /* No need to continue. */ | |
1da177e4 | 877 | |
4434a38c CH |
878 | ret = chsc_alloc_sei_area(); |
879 | if (ret) | |
880 | goto out; | |
881 | ||
882 | ret = slow_subchannel_init(); | |
883 | if (ret) | |
884 | goto out; | |
885 | ||
f5daba1d | 886 | ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); |
c1156189 CH |
887 | if (ret) |
888 | goto out; | |
889 | ||
1da177e4 LT |
890 | if ((ret = bus_register(&css_bus_type))) |
891 | goto out; | |
1da177e4 | 892 | |
fb6958a5 CH |
893 | /* Try to enable MSS. */ |
894 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
895 | switch (ret) { | |
896 | case 0: /* Success. */ | |
897 | max_ssid = __MAX_SSID; | |
898 | break; | |
899 | case -ENOMEM: | |
900 | goto out_bus; | |
901 | default: | |
902 | max_ssid = 0; | |
903 | } | |
a28c6944 CH |
904 | /* Setup css structure. */ |
905 | for (i = 0; i <= __MAX_CSSID; i++) { | |
7c9f4e3a CH |
906 | struct channel_subsystem *css; |
907 | ||
908 | css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
909 | if (!css) { | |
a28c6944 | 910 | ret = -ENOMEM; |
fb6958a5 | 911 | goto out_unregister; |
a28c6944 | 912 | } |
7c9f4e3a | 913 | channel_subsystems[i] = css; |
d7b5a4c9 | 914 | ret = setup_css(i); |
a2164b81 CH |
915 | if (ret) { |
916 | kfree(channel_subsystems[i]); | |
917 | goto out_unregister; | |
918 | } | |
7c9f4e3a | 919 | ret = device_register(&css->device); |
a2164b81 CH |
920 | if (ret) { |
921 | put_device(&css->device); | |
922 | goto out_unregister; | |
923 | } | |
75784c00 | 924 | if (css_chsc_characteristics.secm) { |
7c9f4e3a | 925 | ret = device_create_file(&css->device, |
7e560814 CH |
926 | &dev_attr_cm_enable); |
927 | if (ret) | |
928 | goto out_device; | |
929 | } | |
7c9f4e3a | 930 | ret = device_register(&css->pseudo_subchannel->dev); |
d7b5a4c9 CH |
931 | if (ret) |
932 | goto out_file; | |
a28c6944 | 933 | } |
a55360df CH |
934 | ret = register_reboot_notifier(&css_reboot_notifier); |
935 | if (ret) | |
a2164b81 | 936 | goto out_unregister; |
dcbd16d5 SO |
937 | ret = register_pm_notifier(&css_power_notifier); |
938 | if (ret) { | |
939 | unregister_reboot_notifier(&css_reboot_notifier); | |
940 | goto out_unregister; | |
941 | } | |
1da177e4 LT |
942 | css_init_done = 1; |
943 | ||
3a3fc29a | 944 | /* Enable default isc for I/O subchannels. */ |
6ef556cc | 945 | isc_register(IO_SCH_ISC); |
1da177e4 | 946 | |
f97a56fb | 947 | for_each_subchannel(__init_channel_subsystem, NULL); |
1da177e4 | 948 | return 0; |
d7b5a4c9 | 949 | out_file: |
a2164b81 CH |
950 | if (css_chsc_characteristics.secm) |
951 | device_remove_file(&channel_subsystems[i]->device, | |
952 | &dev_attr_cm_enable); | |
7e560814 | 953 | out_device: |
7c9f4e3a | 954 | device_unregister(&channel_subsystems[i]->device); |
fb6958a5 | 955 | out_unregister: |
a28c6944 | 956 | while (i > 0) { |
7c9f4e3a CH |
957 | struct channel_subsystem *css; |
958 | ||
a28c6944 | 959 | i--; |
7c9f4e3a CH |
960 | css = channel_subsystems[i]; |
961 | device_unregister(&css->pseudo_subchannel->dev); | |
a2164b81 | 962 | css->pseudo_subchannel = NULL; |
75784c00 | 963 | if (css_chsc_characteristics.secm) |
7c9f4e3a | 964 | device_remove_file(&css->device, |
495a5b45 | 965 | &dev_attr_cm_enable); |
7c9f4e3a | 966 | device_unregister(&css->device); |
a28c6944 | 967 | } |
fb6958a5 | 968 | out_bus: |
1da177e4 LT |
969 | bus_unregister(&css_bus_type); |
970 | out: | |
f5daba1d | 971 | crw_unregister_handler(CRW_RSC_CSS); |
4434a38c CH |
972 | chsc_free_sei_area(); |
973 | kfree(slow_subchannel_set); | |
e6d5a428 ME |
974 | pr_alert("The CSS device driver initialization failed with " |
975 | "errno=%d\n", ret); | |
1da177e4 LT |
976 | return ret; |
977 | } | |
978 | ||
d7b5a4c9 CH |
979 | int sch_is_pseudo_sch(struct subchannel *sch) |
980 | { | |
981 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
982 | } | |
983 | ||
f08adc00 | 984 | static int css_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 985 | { |
084325d8 CH |
986 | struct subchannel *sch = to_subchannel(dev); |
987 | struct css_driver *driver = to_cssdriver(drv); | |
f08adc00 | 988 | struct css_device_id *id; |
1da177e4 | 989 | |
f08adc00 CH |
990 | for (id = driver->subchannel_type; id->match_flags; id++) { |
991 | if (sch->st == id->type) | |
992 | return 1; | |
993 | } | |
1da177e4 LT |
994 | |
995 | return 0; | |
996 | } | |
997 | ||
98c13c28 | 998 | static int css_probe(struct device *dev) |
8bbace7e CH |
999 | { |
1000 | struct subchannel *sch; | |
98c13c28 | 1001 | int ret; |
8bbace7e CH |
1002 | |
1003 | sch = to_subchannel(dev); | |
084325d8 | 1004 | sch->driver = to_cssdriver(dev->driver); |
98c13c28 CH |
1005 | ret = sch->driver->probe ? sch->driver->probe(sch) : 0; |
1006 | if (ret) | |
1007 | sch->driver = NULL; | |
1008 | return ret; | |
8bbace7e CH |
1009 | } |
1010 | ||
98c13c28 | 1011 | static int css_remove(struct device *dev) |
8bbace7e CH |
1012 | { |
1013 | struct subchannel *sch; | |
98c13c28 | 1014 | int ret; |
8bbace7e CH |
1015 | |
1016 | sch = to_subchannel(dev); | |
98c13c28 CH |
1017 | ret = sch->driver->remove ? sch->driver->remove(sch) : 0; |
1018 | sch->driver = NULL; | |
1019 | return ret; | |
8bbace7e CH |
1020 | } |
1021 | ||
98c13c28 | 1022 | static void css_shutdown(struct device *dev) |
8bbace7e CH |
1023 | { |
1024 | struct subchannel *sch; | |
1025 | ||
1026 | sch = to_subchannel(dev); | |
98c13c28 | 1027 | if (sch->driver && sch->driver->shutdown) |
8bbace7e CH |
1028 | sch->driver->shutdown(sch); |
1029 | } | |
1030 | ||
7e9db9ea CH |
1031 | static int css_uevent(struct device *dev, struct kobj_uevent_env *env) |
1032 | { | |
1033 | struct subchannel *sch = to_subchannel(dev); | |
1034 | int ret; | |
1035 | ||
1036 | ret = add_uevent_var(env, "ST=%01X", sch->st); | |
1037 | if (ret) | |
1038 | return ret; | |
1039 | ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); | |
1040 | return ret; | |
1041 | } | |
1042 | ||
dcbd16d5 SO |
1043 | static int css_pm_prepare(struct device *dev) |
1044 | { | |
1045 | struct subchannel *sch = to_subchannel(dev); | |
1046 | struct css_driver *drv; | |
1047 | ||
1048 | if (mutex_is_locked(&sch->reg_mutex)) | |
1049 | return -EAGAIN; | |
1050 | if (!sch->dev.driver) | |
1051 | return 0; | |
1052 | drv = to_cssdriver(sch->dev.driver); | |
1053 | /* Notify drivers that they may not register children. */ | |
1054 | return drv->prepare ? drv->prepare(sch) : 0; | |
1055 | } | |
1056 | ||
1057 | static void css_pm_complete(struct device *dev) | |
1058 | { | |
1059 | struct subchannel *sch = to_subchannel(dev); | |
1060 | struct css_driver *drv; | |
1061 | ||
1062 | if (!sch->dev.driver) | |
1063 | return; | |
1064 | drv = to_cssdriver(sch->dev.driver); | |
1065 | if (drv->complete) | |
1066 | drv->complete(sch); | |
1067 | } | |
1068 | ||
1069 | static int css_pm_freeze(struct device *dev) | |
1070 | { | |
1071 | struct subchannel *sch = to_subchannel(dev); | |
1072 | struct css_driver *drv; | |
1073 | ||
1074 | if (!sch->dev.driver) | |
1075 | return 0; | |
1076 | drv = to_cssdriver(sch->dev.driver); | |
1077 | return drv->freeze ? drv->freeze(sch) : 0; | |
1078 | } | |
1079 | ||
1080 | static int css_pm_thaw(struct device *dev) | |
1081 | { | |
1082 | struct subchannel *sch = to_subchannel(dev); | |
1083 | struct css_driver *drv; | |
1084 | ||
1085 | if (!sch->dev.driver) | |
1086 | return 0; | |
1087 | drv = to_cssdriver(sch->dev.driver); | |
1088 | return drv->thaw ? drv->thaw(sch) : 0; | |
1089 | } | |
1090 | ||
1091 | static int css_pm_restore(struct device *dev) | |
1092 | { | |
1093 | struct subchannel *sch = to_subchannel(dev); | |
1094 | struct css_driver *drv; | |
1095 | ||
1096 | if (!sch->dev.driver) | |
1097 | return 0; | |
1098 | drv = to_cssdriver(sch->dev.driver); | |
1099 | return drv->restore ? drv->restore(sch) : 0; | |
1100 | } | |
1101 | ||
1102 | static struct dev_pm_ops css_pm_ops = { | |
1103 | .prepare = css_pm_prepare, | |
1104 | .complete = css_pm_complete, | |
1105 | .freeze = css_pm_freeze, | |
1106 | .thaw = css_pm_thaw, | |
1107 | .restore = css_pm_restore, | |
1108 | }; | |
1109 | ||
1da177e4 | 1110 | struct bus_type css_bus_type = { |
8bbace7e CH |
1111 | .name = "css", |
1112 | .match = css_bus_match, | |
1113 | .probe = css_probe, | |
1114 | .remove = css_remove, | |
1115 | .shutdown = css_shutdown, | |
7e9db9ea | 1116 | .uevent = css_uevent, |
dcbd16d5 | 1117 | .pm = &css_pm_ops, |
1da177e4 LT |
1118 | }; |
1119 | ||
25b7bb58 CH |
1120 | /** |
1121 | * css_driver_register - register a css driver | |
1122 | * @cdrv: css driver to register | |
1123 | * | |
1124 | * This is mainly a wrapper around driver_register that sets name | |
1125 | * and bus_type in the embedded struct device_driver correctly. | |
1126 | */ | |
1127 | int css_driver_register(struct css_driver *cdrv) | |
1128 | { | |
1129 | cdrv->drv.name = cdrv->name; | |
1130 | cdrv->drv.bus = &css_bus_type; | |
4beee646 | 1131 | cdrv->drv.owner = cdrv->owner; |
25b7bb58 CH |
1132 | return driver_register(&cdrv->drv); |
1133 | } | |
1134 | EXPORT_SYMBOL_GPL(css_driver_register); | |
1135 | ||
1136 | /** | |
1137 | * css_driver_unregister - unregister a css driver | |
1138 | * @cdrv: css driver to unregister | |
1139 | * | |
1140 | * This is a wrapper around driver_unregister. | |
1141 | */ | |
1142 | void css_driver_unregister(struct css_driver *cdrv) | |
1143 | { | |
1144 | driver_unregister(&cdrv->drv); | |
1145 | } | |
1146 | EXPORT_SYMBOL_GPL(css_driver_unregister); | |
1147 | ||
1da177e4 LT |
1148 | subsys_initcall(init_channel_subsystem); |
1149 | ||
1da177e4 LT |
1150 | MODULE_LICENSE("GPL"); |
1151 | EXPORT_SYMBOL(css_bus_type); |