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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; |
b0a285d3 | 34 | int max_ssid; |
1da177e4 | 35 | |
7c9f4e3a | 36 | struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1]; |
1da177e4 | 37 | |
4d284cac | 38 | int |
f97a56fb CH |
39 | for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) |
40 | { | |
41 | struct subchannel_id schid; | |
42 | int ret; | |
43 | ||
44 | init_subchannel_id(&schid); | |
45 | ret = -ENODEV; | |
46 | do { | |
fb6958a5 CH |
47 | do { |
48 | ret = fn(schid, data); | |
49 | if (ret) | |
50 | break; | |
51 | } while (schid.sch_no++ < __MAX_SUBCHANNEL); | |
52 | schid.sch_no = 0; | |
53 | } while (schid.ssid++ < max_ssid); | |
f97a56fb CH |
54 | return ret; |
55 | } | |
56 | ||
e82a1567 PO |
57 | struct cb_data { |
58 | void *data; | |
59 | struct idset *set; | |
60 | int (*fn_known_sch)(struct subchannel *, void *); | |
61 | int (*fn_unknown_sch)(struct subchannel_id, void *); | |
62 | }; | |
63 | ||
64 | static int call_fn_known_sch(struct device *dev, void *data) | |
65 | { | |
66 | struct subchannel *sch = to_subchannel(dev); | |
67 | struct cb_data *cb = data; | |
68 | int rc = 0; | |
69 | ||
70 | idset_sch_del(cb->set, sch->schid); | |
71 | if (cb->fn_known_sch) | |
72 | rc = cb->fn_known_sch(sch, cb->data); | |
73 | return rc; | |
74 | } | |
75 | ||
76 | static int call_fn_unknown_sch(struct subchannel_id schid, void *data) | |
77 | { | |
78 | struct cb_data *cb = data; | |
79 | int rc = 0; | |
80 | ||
81 | if (idset_sch_contains(cb->set, schid)) | |
82 | rc = cb->fn_unknown_sch(schid, cb->data); | |
83 | return rc; | |
84 | } | |
85 | ||
90ac24a5 SO |
86 | static int call_fn_all_sch(struct subchannel_id schid, void *data) |
87 | { | |
88 | struct cb_data *cb = data; | |
89 | struct subchannel *sch; | |
90 | int rc = 0; | |
91 | ||
92 | sch = get_subchannel_by_schid(schid); | |
93 | if (sch) { | |
94 | if (cb->fn_known_sch) | |
95 | rc = cb->fn_known_sch(sch, cb->data); | |
96 | put_device(&sch->dev); | |
97 | } else { | |
98 | if (cb->fn_unknown_sch) | |
99 | rc = cb->fn_unknown_sch(schid, cb->data); | |
100 | } | |
101 | ||
102 | return rc; | |
103 | } | |
104 | ||
e82a1567 PO |
105 | int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), |
106 | int (*fn_unknown)(struct subchannel_id, | |
107 | void *), void *data) | |
108 | { | |
109 | struct cb_data cb; | |
110 | int rc; | |
111 | ||
e82a1567 PO |
112 | cb.data = data; |
113 | cb.fn_known_sch = fn_known; | |
114 | cb.fn_unknown_sch = fn_unknown; | |
90ac24a5 SO |
115 | |
116 | cb.set = idset_sch_new(); | |
117 | if (!cb.set) | |
118 | /* fall back to brute force scanning in case of oom */ | |
119 | return for_each_subchannel(call_fn_all_sch, &cb); | |
120 | ||
121 | idset_fill(cb.set); | |
122 | ||
e82a1567 PO |
123 | /* Process registered subchannels. */ |
124 | rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); | |
125 | if (rc) | |
126 | goto out; | |
127 | /* Process unregistered subchannels. */ | |
128 | if (fn_unknown) | |
129 | rc = for_each_subchannel(call_fn_unknown_sch, &cb); | |
130 | out: | |
131 | idset_free(cb.set); | |
132 | ||
133 | return rc; | |
134 | } | |
135 | ||
1da177e4 | 136 | static struct subchannel * |
a8237fc4 | 137 | css_alloc_subchannel(struct subchannel_id schid) |
1da177e4 LT |
138 | { |
139 | struct subchannel *sch; | |
140 | int ret; | |
141 | ||
142 | sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA); | |
143 | if (sch == NULL) | |
144 | return ERR_PTR(-ENOMEM); | |
a8237fc4 | 145 | ret = cio_validate_subchannel (sch, schid); |
1da177e4 LT |
146 | if (ret < 0) { |
147 | kfree(sch); | |
148 | return ERR_PTR(ret); | |
149 | } | |
1da177e4 LT |
150 | return sch; |
151 | } | |
152 | ||
1da177e4 LT |
153 | static void |
154 | css_subchannel_release(struct device *dev) | |
155 | { | |
156 | struct subchannel *sch; | |
157 | ||
158 | sch = to_subchannel(dev); | |
2ec22984 | 159 | if (!cio_is_console(sch->schid)) { |
1da73bc8 PO |
160 | /* Reset intparm to zeroes. */ |
161 | sch->config.intparm = 0; | |
162 | cio_commit_config(sch); | |
2ec22984 | 163 | kfree(sch->lock); |
1da177e4 | 164 | kfree(sch); |
2ec22984 | 165 | } |
1da177e4 LT |
166 | } |
167 | ||
07c6a338 | 168 | static int css_sch_device_register(struct subchannel *sch) |
6ab4879a CH |
169 | { |
170 | int ret; | |
171 | ||
172 | mutex_lock(&sch->reg_mutex); | |
6ee4fec6 SO |
173 | dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, |
174 | sch->schid.sch_no); | |
6ab4879a CH |
175 | ret = device_register(&sch->dev); |
176 | mutex_unlock(&sch->reg_mutex); | |
177 | return ret; | |
178 | } | |
179 | ||
44a1c19e CH |
180 | /** |
181 | * css_sch_device_unregister - unregister a subchannel | |
182 | * @sch: subchannel to be unregistered | |
183 | */ | |
6ab4879a CH |
184 | void css_sch_device_unregister(struct subchannel *sch) |
185 | { | |
186 | mutex_lock(&sch->reg_mutex); | |
ef60cd13 SO |
187 | if (device_is_registered(&sch->dev)) |
188 | device_unregister(&sch->dev); | |
6ab4879a CH |
189 | mutex_unlock(&sch->reg_mutex); |
190 | } | |
44a1c19e | 191 | EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
6ab4879a | 192 | |
7ad6a249 PO |
193 | static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) |
194 | { | |
195 | int i; | |
196 | int mask; | |
197 | ||
198 | memset(ssd, 0, sizeof(struct chsc_ssd_info)); | |
199 | ssd->path_mask = pmcw->pim; | |
200 | for (i = 0; i < 8; i++) { | |
201 | mask = 0x80 >> i; | |
202 | if (pmcw->pim & mask) { | |
203 | chp_id_init(&ssd->chpid[i]); | |
204 | ssd->chpid[i].id = pmcw->chpid[i]; | |
205 | } | |
206 | } | |
207 | } | |
208 | ||
209 | static void ssd_register_chpids(struct chsc_ssd_info *ssd) | |
210 | { | |
211 | int i; | |
212 | int mask; | |
213 | ||
214 | for (i = 0; i < 8; i++) { | |
215 | mask = 0x80 >> i; | |
216 | if (ssd->path_mask & mask) | |
217 | if (!chp_is_registered(ssd->chpid[i])) | |
218 | chp_new(ssd->chpid[i]); | |
219 | } | |
220 | } | |
221 | ||
222 | void css_update_ssd_info(struct subchannel *sch) | |
223 | { | |
224 | int ret; | |
225 | ||
226 | if (cio_is_console(sch->schid)) { | |
227 | /* Console is initialized too early for functions requiring | |
228 | * memory allocation. */ | |
229 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
230 | } else { | |
231 | ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); | |
232 | if (ret) | |
233 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
234 | ssd_register_chpids(&sch->ssd_info); | |
235 | } | |
236 | } | |
237 | ||
7e9db9ea CH |
238 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
239 | char *buf) | |
240 | { | |
241 | struct subchannel *sch = to_subchannel(dev); | |
242 | ||
243 | return sprintf(buf, "%01x\n", sch->st); | |
244 | } | |
245 | ||
246 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
247 | ||
248 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
249 | char *buf) | |
250 | { | |
251 | struct subchannel *sch = to_subchannel(dev); | |
252 | ||
253 | return sprintf(buf, "css:t%01X\n", sch->st); | |
254 | } | |
255 | ||
256 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); | |
257 | ||
258 | static struct attribute *subch_attrs[] = { | |
259 | &dev_attr_type.attr, | |
260 | &dev_attr_modalias.attr, | |
261 | NULL, | |
262 | }; | |
263 | ||
264 | static struct attribute_group subch_attr_group = { | |
265 | .attrs = subch_attrs, | |
266 | }; | |
267 | ||
a4dbd674 | 268 | static const struct attribute_group *default_subch_attr_groups[] = { |
7e9db9ea CH |
269 | &subch_attr_group, |
270 | NULL, | |
271 | }; | |
272 | ||
7ad6a249 | 273 | static int css_register_subchannel(struct subchannel *sch) |
1da177e4 LT |
274 | { |
275 | int ret; | |
276 | ||
277 | /* Initialize the subchannel structure */ | |
7c9f4e3a | 278 | sch->dev.parent = &channel_subsystems[0]->device; |
1da177e4 LT |
279 | sch->dev.bus = &css_bus_type; |
280 | sch->dev.release = &css_subchannel_release; | |
7e9db9ea | 281 | sch->dev.groups = default_subch_attr_groups; |
5bf04b20 CH |
282 | /* |
283 | * We don't want to generate uevents for I/O subchannels that don't | |
284 | * have a working ccw device behind them since they will be | |
285 | * unregistered before they can be used anyway, so we delay the add | |
286 | * uevent until after device recognition was successful. | |
7e9db9ea CH |
287 | * Note that we suppress the uevent for all subchannel types; |
288 | * the subchannel driver can decide itself when it wants to inform | |
289 | * userspace of its existence. | |
5bf04b20 | 290 | */ |
f67f129e | 291 | dev_set_uevent_suppress(&sch->dev, 1); |
7ad6a249 | 292 | css_update_ssd_info(sch); |
1da177e4 | 293 | /* make it known to the system */ |
6ab4879a | 294 | ret = css_sch_device_register(sch); |
7674da77 | 295 | if (ret) { |
e556bbbd CH |
296 | CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n", |
297 | sch->schid.ssid, sch->schid.sch_no, ret); | |
7674da77 CH |
298 | return ret; |
299 | } | |
7e9db9ea CH |
300 | if (!sch->driver) { |
301 | /* | |
302 | * No driver matched. Generate the uevent now so that | |
303 | * a fitting driver module may be loaded based on the | |
304 | * modalias. | |
305 | */ | |
f67f129e | 306 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea CH |
307 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
308 | } | |
1da177e4 LT |
309 | return ret; |
310 | } | |
311 | ||
c820de39 | 312 | int css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
313 | { |
314 | int ret; | |
315 | struct subchannel *sch; | |
316 | ||
703e5c99 SO |
317 | if (cio_is_console(schid)) |
318 | sch = cio_get_console_subchannel(); | |
319 | else { | |
320 | sch = css_alloc_subchannel(schid); | |
321 | if (IS_ERR(sch)) | |
322 | return PTR_ERR(sch); | |
323 | } | |
1da177e4 | 324 | ret = css_register_subchannel(sch); |
703e5c99 SO |
325 | if (ret) { |
326 | if (!cio_is_console(schid)) | |
327 | put_device(&sch->dev); | |
328 | } | |
1da177e4 LT |
329 | return ret; |
330 | } | |
331 | ||
b0744bd2 CH |
332 | static int |
333 | check_subchannel(struct device * dev, void * data) | |
334 | { | |
335 | struct subchannel *sch; | |
a8237fc4 | 336 | struct subchannel_id *schid = data; |
b0744bd2 CH |
337 | |
338 | sch = to_subchannel(dev); | |
a8237fc4 | 339 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
340 | } |
341 | ||
1da177e4 | 342 | struct subchannel * |
a8237fc4 | 343 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 344 | { |
1da177e4 LT |
345 | struct device *dev; |
346 | ||
b0744bd2 | 347 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 348 | &schid, check_subchannel); |
1da177e4 | 349 | |
b0744bd2 | 350 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
351 | } |
352 | ||
b279a4f5 CH |
353 | /** |
354 | * css_sch_is_valid() - check if a subchannel is valid | |
355 | * @schib: subchannel information block for the subchannel | |
356 | */ | |
357 | int css_sch_is_valid(struct schib *schib) | |
358 | { | |
359 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) | |
360 | return 0; | |
b3a686f4 CH |
361 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) |
362 | return 0; | |
b279a4f5 CH |
363 | return 1; |
364 | } | |
365 | EXPORT_SYMBOL_GPL(css_sch_is_valid); | |
366 | ||
564337f3 PO |
367 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) |
368 | { | |
369 | struct schib schib; | |
370 | ||
371 | if (!slow) { | |
372 | /* Will be done on the slow path. */ | |
373 | return -EAGAIN; | |
374 | } | |
b279a4f5 | 375 | if (stsch_err(schid, &schib) || !css_sch_is_valid(&schib)) { |
564337f3 PO |
376 | /* Unusable - ignore. */ |
377 | return 0; | |
1da177e4 | 378 | } |
564337f3 PO |
379 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, " |
380 | "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER); | |
381 | ||
382 | return css_probe_device(schid); | |
383 | } | |
384 | ||
c820de39 CH |
385 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) |
386 | { | |
387 | int ret = 0; | |
388 | ||
389 | if (sch->driver) { | |
390 | if (sch->driver->sch_event) | |
391 | ret = sch->driver->sch_event(sch, slow); | |
392 | else | |
393 | dev_dbg(&sch->dev, | |
394 | "Got subchannel machine check but " | |
395 | "no sch_event handler provided.\n"); | |
396 | } | |
397 | return ret; | |
398 | } | |
399 | ||
83b3370c | 400 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
401 | { |
402 | struct subchannel *sch; | |
403 | int ret; | |
404 | ||
405 | sch = get_subchannel_by_schid(schid); | |
406 | if (sch) { | |
407 | ret = css_evaluate_known_subchannel(sch, slow); | |
408 | put_device(&sch->dev); | |
409 | } else | |
410 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
411 | if (ret == -EAGAIN) |
412 | css_schedule_eval(schid); | |
1da177e4 LT |
413 | } |
414 | ||
83b3370c PO |
415 | static struct idset *slow_subchannel_set; |
416 | static spinlock_t slow_subchannel_lock; | |
25530553 SO |
417 | static wait_queue_head_t css_eval_wq; |
418 | static atomic_t css_eval_scheduled; | |
83b3370c PO |
419 | |
420 | static int __init slow_subchannel_init(void) | |
1da177e4 | 421 | { |
83b3370c | 422 | spin_lock_init(&slow_subchannel_lock); |
25530553 SO |
423 | atomic_set(&css_eval_scheduled, 0); |
424 | init_waitqueue_head(&css_eval_wq); | |
83b3370c PO |
425 | slow_subchannel_set = idset_sch_new(); |
426 | if (!slow_subchannel_set) { | |
e556bbbd | 427 | CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); |
83b3370c PO |
428 | return -ENOMEM; |
429 | } | |
430 | return 0; | |
1da177e4 LT |
431 | } |
432 | ||
e82a1567 | 433 | static int slow_eval_known_fn(struct subchannel *sch, void *data) |
1da177e4 | 434 | { |
e82a1567 PO |
435 | int eval; |
436 | int rc; | |
1da177e4 LT |
437 | |
438 | spin_lock_irq(&slow_subchannel_lock); | |
e82a1567 PO |
439 | eval = idset_sch_contains(slow_subchannel_set, sch->schid); |
440 | idset_sch_del(slow_subchannel_set, sch->schid); | |
441 | spin_unlock_irq(&slow_subchannel_lock); | |
442 | if (eval) { | |
443 | rc = css_evaluate_known_subchannel(sch, 1); | |
444 | if (rc == -EAGAIN) | |
445 | css_schedule_eval(sch->schid); | |
1da177e4 | 446 | } |
e82a1567 PO |
447 | return 0; |
448 | } | |
449 | ||
450 | static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) | |
451 | { | |
452 | int eval; | |
453 | int rc = 0; | |
454 | ||
455 | spin_lock_irq(&slow_subchannel_lock); | |
456 | eval = idset_sch_contains(slow_subchannel_set, schid); | |
457 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 458 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
459 | if (eval) { |
460 | rc = css_evaluate_new_subchannel(schid, 1); | |
461 | switch (rc) { | |
462 | case -EAGAIN: | |
463 | css_schedule_eval(schid); | |
464 | rc = 0; | |
465 | break; | |
466 | case -ENXIO: | |
467 | case -ENOMEM: | |
468 | case -EIO: | |
469 | /* These should abort looping */ | |
470 | break; | |
471 | default: | |
472 | rc = 0; | |
473 | } | |
474 | } | |
475 | return rc; | |
476 | } | |
477 | ||
478 | static void css_slow_path_func(struct work_struct *unused) | |
479 | { | |
25530553 SO |
480 | unsigned long flags; |
481 | ||
e82a1567 PO |
482 | CIO_TRACE_EVENT(4, "slowpath"); |
483 | for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, | |
484 | NULL); | |
25530553 SO |
485 | spin_lock_irqsave(&slow_subchannel_lock, flags); |
486 | if (idset_is_empty(slow_subchannel_set)) { | |
487 | atomic_set(&css_eval_scheduled, 0); | |
488 | wake_up(&css_eval_wq); | |
489 | } | |
490 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
1da177e4 LT |
491 | } |
492 | ||
83b3370c | 493 | static DECLARE_WORK(slow_path_work, css_slow_path_func); |
1da177e4 LT |
494 | struct workqueue_struct *slow_path_wq; |
495 | ||
83b3370c PO |
496 | void css_schedule_eval(struct subchannel_id schid) |
497 | { | |
498 | unsigned long flags; | |
499 | ||
500 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
501 | idset_sch_add(slow_subchannel_set, schid); | |
25530553 | 502 | atomic_set(&css_eval_scheduled, 1); |
83b3370c PO |
503 | queue_work(slow_path_wq, &slow_path_work); |
504 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
505 | } | |
506 | ||
507 | void css_schedule_eval_all(void) | |
508 | { | |
509 | unsigned long flags; | |
510 | ||
511 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
512 | idset_fill(slow_subchannel_set); | |
25530553 | 513 | atomic_set(&css_eval_scheduled, 1); |
83b3370c PO |
514 | queue_work(slow_path_wq, &slow_path_work); |
515 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
516 | } | |
517 | ||
703e5c99 | 518 | static int __unset_registered(struct device *dev, void *data) |
22806dc1 | 519 | { |
703e5c99 SO |
520 | struct idset *set = data; |
521 | struct subchannel *sch = to_subchannel(dev); | |
40154b82 | 522 | |
703e5c99 SO |
523 | idset_sch_del(set, sch->schid); |
524 | return 0; | |
56e25e97 PO |
525 | } |
526 | ||
703e5c99 | 527 | void css_schedule_eval_all_unreg(void) |
40154b82 | 528 | { |
703e5c99 SO |
529 | unsigned long flags; |
530 | struct idset *unreg_set; | |
40154b82 | 531 | |
703e5c99 SO |
532 | /* Find unregistered subchannels. */ |
533 | unreg_set = idset_sch_new(); | |
534 | if (!unreg_set) { | |
535 | /* Fallback. */ | |
536 | css_schedule_eval_all(); | |
56e25e97 PO |
537 | return; |
538 | } | |
703e5c99 SO |
539 | idset_fill(unreg_set); |
540 | bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered); | |
541 | /* Apply to slow_subchannel_set. */ | |
542 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
543 | idset_add_set(slow_subchannel_set, unreg_set); | |
544 | atomic_set(&css_eval_scheduled, 1); | |
545 | queue_work(slow_path_wq, &slow_path_work); | |
546 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
547 | idset_free(unreg_set); | |
40154b82 PO |
548 | } |
549 | ||
703e5c99 SO |
550 | void css_wait_for_slow_path(void) |
551 | { | |
552 | flush_workqueue(slow_path_wq); | |
553 | } | |
40154b82 PO |
554 | |
555 | /* Schedule reprobing of all unregistered subchannels. */ | |
556 | void css_schedule_reprobe(void) | |
557 | { | |
703e5c99 | 558 | css_schedule_eval_all_unreg(); |
40154b82 | 559 | } |
40154b82 PO |
560 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); |
561 | ||
1da177e4 LT |
562 | /* |
563 | * Called from the machine check handler for subchannel report words. | |
564 | */ | |
c1156189 | 565 | static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
1da177e4 | 566 | { |
a8237fc4 | 567 | struct subchannel_id mchk_schid; |
1da177e4 | 568 | |
c1156189 CH |
569 | if (overflow) { |
570 | css_schedule_eval_all(); | |
571 | return; | |
572 | } | |
573 | CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " | |
574 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
575 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
576 | crw0->erc, crw0->rsid); | |
577 | if (crw1) | |
578 | CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " | |
579 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
580 | crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, | |
581 | crw1->anc, crw1->erc, crw1->rsid); | |
a8237fc4 | 582 | init_subchannel_id(&mchk_schid); |
c1156189 CH |
583 | mchk_schid.sch_no = crw0->rsid; |
584 | if (crw1) | |
585 | mchk_schid.ssid = (crw1->rsid >> 8) & 3; | |
fb6958a5 | 586 | |
c1156189 | 587 | /* |
1da177e4 LT |
588 | * Since we are always presented with IPI in the CRW, we have to |
589 | * use stsch() to find out if the subchannel in question has come | |
590 | * or gone. | |
591 | */ | |
83b3370c | 592 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
593 | } |
594 | ||
595 | static void __init | |
a28c6944 | 596 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 597 | { |
75784c00 | 598 | if (css_general_characteristics.mcss) { |
a28c6944 CH |
599 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
600 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
601 | } else { | |
1da177e4 | 602 | #ifdef CONFIG_SMP |
7b468488 | 603 | css->global_pgid.pgid_high.cpu_addr = stap(); |
1da177e4 | 604 | #else |
a28c6944 | 605 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
606 | #endif |
607 | } | |
e86a6ed6 HC |
608 | css->global_pgid.cpu_id = S390_lowcore.cpu_id.ident; |
609 | css->global_pgid.cpu_model = S390_lowcore.cpu_id.machine; | |
a28c6944 CH |
610 | css->global_pgid.tod_high = tod_high; |
611 | ||
612 | } | |
613 | ||
3b793060 CH |
614 | static void |
615 | channel_subsystem_release(struct device *dev) | |
616 | { | |
617 | struct channel_subsystem *css; | |
618 | ||
619 | css = to_css(dev); | |
495a5b45 | 620 | mutex_destroy(&css->mutex); |
a2164b81 CH |
621 | if (css->pseudo_subchannel) { |
622 | /* Implies that it has been generated but never registered. */ | |
623 | css_subchannel_release(&css->pseudo_subchannel->dev); | |
624 | css->pseudo_subchannel = NULL; | |
625 | } | |
3b793060 CH |
626 | kfree(css); |
627 | } | |
628 | ||
495a5b45 CH |
629 | static ssize_t |
630 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
631 | char *buf) | |
632 | { | |
633 | struct channel_subsystem *css = to_css(dev); | |
8284fb19 | 634 | int ret; |
495a5b45 CH |
635 | |
636 | if (!css) | |
637 | return 0; | |
8284fb19 ME |
638 | mutex_lock(&css->mutex); |
639 | ret = sprintf(buf, "%x\n", css->cm_enabled); | |
640 | mutex_unlock(&css->mutex); | |
641 | return ret; | |
495a5b45 CH |
642 | } |
643 | ||
644 | static ssize_t | |
645 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
646 | const char *buf, size_t count) | |
647 | { | |
648 | struct channel_subsystem *css = to_css(dev); | |
649 | int ret; | |
2f972202 | 650 | unsigned long val; |
495a5b45 | 651 | |
2f972202 CH |
652 | ret = strict_strtoul(buf, 16, &val); |
653 | if (ret) | |
654 | return ret; | |
8284fb19 | 655 | mutex_lock(&css->mutex); |
2f972202 CH |
656 | switch (val) { |
657 | case 0: | |
495a5b45 CH |
658 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; |
659 | break; | |
2f972202 | 660 | case 1: |
495a5b45 CH |
661 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); |
662 | break; | |
663 | default: | |
664 | ret = -EINVAL; | |
665 | } | |
8284fb19 | 666 | mutex_unlock(&css->mutex); |
495a5b45 CH |
667 | return ret < 0 ? ret : count; |
668 | } | |
669 | ||
670 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
671 | ||
4d284cac | 672 | static int __init setup_css(int nr) |
a28c6944 CH |
673 | { |
674 | u32 tod_high; | |
d7b5a4c9 | 675 | int ret; |
7c9f4e3a | 676 | struct channel_subsystem *css; |
a28c6944 | 677 | |
7c9f4e3a CH |
678 | css = channel_subsystems[nr]; |
679 | memset(css, 0, sizeof(struct channel_subsystem)); | |
680 | css->pseudo_subchannel = | |
681 | kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL); | |
682 | if (!css->pseudo_subchannel) | |
d7b5a4c9 | 683 | return -ENOMEM; |
7c9f4e3a CH |
684 | css->pseudo_subchannel->dev.parent = &css->device; |
685 | css->pseudo_subchannel->dev.release = css_subchannel_release; | |
1bf5b285 | 686 | dev_set_name(&css->pseudo_subchannel->dev, "defunct"); |
7c9f4e3a | 687 | ret = cio_create_sch_lock(css->pseudo_subchannel); |
d7b5a4c9 | 688 | if (ret) { |
7c9f4e3a | 689 | kfree(css->pseudo_subchannel); |
d7b5a4c9 CH |
690 | return ret; |
691 | } | |
7c9f4e3a CH |
692 | mutex_init(&css->mutex); |
693 | css->valid = 1; | |
694 | css->cssid = nr; | |
1bf5b285 | 695 | dev_set_name(&css->device, "css%x", nr); |
7c9f4e3a | 696 | css->device.release = channel_subsystem_release; |
a28c6944 | 697 | tod_high = (u32) (get_clock() >> 32); |
7c9f4e3a | 698 | css_generate_pgid(css, tod_high); |
d7b5a4c9 | 699 | return 0; |
1da177e4 LT |
700 | } |
701 | ||
a55360df CH |
702 | static int css_reboot_event(struct notifier_block *this, |
703 | unsigned long event, | |
704 | void *ptr) | |
705 | { | |
706 | int ret, i; | |
707 | ||
708 | ret = NOTIFY_DONE; | |
709 | for (i = 0; i <= __MAX_CSSID; i++) { | |
710 | struct channel_subsystem *css; | |
711 | ||
712 | css = channel_subsystems[i]; | |
8284fb19 | 713 | mutex_lock(&css->mutex); |
a55360df CH |
714 | if (css->cm_enabled) |
715 | if (chsc_secm(css, 0)) | |
716 | ret = NOTIFY_BAD; | |
8284fb19 | 717 | mutex_unlock(&css->mutex); |
a55360df CH |
718 | } |
719 | ||
720 | return ret; | |
721 | } | |
722 | ||
723 | static struct notifier_block css_reboot_notifier = { | |
724 | .notifier_call = css_reboot_event, | |
725 | }; | |
726 | ||
dcbd16d5 SO |
727 | /* |
728 | * Since the css devices are neither on a bus nor have a class | |
729 | * nor have a special device type, we cannot stop/restart channel | |
730 | * path measurements via the normal suspend/resume callbacks, but have | |
731 | * to use notifiers. | |
732 | */ | |
733 | static int css_power_event(struct notifier_block *this, unsigned long event, | |
734 | void *ptr) | |
735 | { | |
736 | void *secm_area; | |
737 | int ret, i; | |
738 | ||
739 | switch (event) { | |
740 | case PM_HIBERNATION_PREPARE: | |
741 | case PM_SUSPEND_PREPARE: | |
742 | ret = NOTIFY_DONE; | |
743 | for (i = 0; i <= __MAX_CSSID; i++) { | |
744 | struct channel_subsystem *css; | |
745 | ||
746 | css = channel_subsystems[i]; | |
747 | mutex_lock(&css->mutex); | |
748 | if (!css->cm_enabled) { | |
749 | mutex_unlock(&css->mutex); | |
750 | continue; | |
751 | } | |
752 | secm_area = (void *)get_zeroed_page(GFP_KERNEL | | |
753 | GFP_DMA); | |
754 | if (secm_area) { | |
755 | if (__chsc_do_secm(css, 0, secm_area)) | |
756 | ret = NOTIFY_BAD; | |
757 | free_page((unsigned long)secm_area); | |
758 | } else | |
759 | ret = NOTIFY_BAD; | |
760 | ||
761 | mutex_unlock(&css->mutex); | |
762 | } | |
763 | break; | |
764 | case PM_POST_HIBERNATION: | |
765 | case PM_POST_SUSPEND: | |
766 | ret = NOTIFY_DONE; | |
767 | for (i = 0; i <= __MAX_CSSID; i++) { | |
768 | struct channel_subsystem *css; | |
769 | ||
770 | css = channel_subsystems[i]; | |
771 | mutex_lock(&css->mutex); | |
772 | if (!css->cm_enabled) { | |
773 | mutex_unlock(&css->mutex); | |
774 | continue; | |
775 | } | |
776 | secm_area = (void *)get_zeroed_page(GFP_KERNEL | | |
777 | GFP_DMA); | |
778 | if (secm_area) { | |
779 | if (__chsc_do_secm(css, 1, secm_area)) | |
780 | ret = NOTIFY_BAD; | |
781 | free_page((unsigned long)secm_area); | |
782 | } else | |
783 | ret = NOTIFY_BAD; | |
784 | ||
785 | mutex_unlock(&css->mutex); | |
786 | } | |
787 | /* search for subchannels, which appeared during hibernation */ | |
788 | css_schedule_reprobe(); | |
789 | break; | |
790 | default: | |
791 | ret = NOTIFY_DONE; | |
792 | } | |
793 | return ret; | |
794 | ||
795 | } | |
796 | static struct notifier_block css_power_notifier = { | |
797 | .notifier_call = css_power_event, | |
798 | }; | |
799 | ||
1da177e4 LT |
800 | /* |
801 | * Now that the driver core is running, we can setup our channel subsystem. | |
802 | * The struct subchannel's are created during probing (except for the | |
803 | * static console subchannel). | |
804 | */ | |
2f17644d | 805 | static int __init css_bus_init(void) |
1da177e4 | 806 | { |
a28c6944 | 807 | int ret, i; |
1da177e4 | 808 | |
4434a38c CH |
809 | ret = chsc_determine_css_characteristics(); |
810 | if (ret == -ENOMEM) | |
2f17644d | 811 | goto out; |
1da177e4 | 812 | |
4434a38c CH |
813 | ret = chsc_alloc_sei_area(); |
814 | if (ret) | |
815 | goto out; | |
816 | ||
b0a285d3 SO |
817 | /* Try to enable MSS. */ |
818 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
819 | switch (ret) { | |
820 | case 0: /* Success. */ | |
821 | max_ssid = __MAX_SSID; | |
822 | break; | |
823 | case -ENOMEM: | |
824 | goto out; | |
825 | default: | |
826 | max_ssid = 0; | |
827 | } | |
828 | ||
4434a38c CH |
829 | ret = slow_subchannel_init(); |
830 | if (ret) | |
831 | goto out; | |
832 | ||
f5daba1d | 833 | ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); |
c1156189 CH |
834 | if (ret) |
835 | goto out; | |
836 | ||
1da177e4 LT |
837 | if ((ret = bus_register(&css_bus_type))) |
838 | goto out; | |
1da177e4 | 839 | |
a28c6944 CH |
840 | /* Setup css structure. */ |
841 | for (i = 0; i <= __MAX_CSSID; i++) { | |
7c9f4e3a CH |
842 | struct channel_subsystem *css; |
843 | ||
844 | css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
845 | if (!css) { | |
a28c6944 | 846 | ret = -ENOMEM; |
fb6958a5 | 847 | goto out_unregister; |
a28c6944 | 848 | } |
7c9f4e3a | 849 | channel_subsystems[i] = css; |
d7b5a4c9 | 850 | ret = setup_css(i); |
a2164b81 CH |
851 | if (ret) { |
852 | kfree(channel_subsystems[i]); | |
853 | goto out_unregister; | |
854 | } | |
7c9f4e3a | 855 | ret = device_register(&css->device); |
a2164b81 CH |
856 | if (ret) { |
857 | put_device(&css->device); | |
858 | goto out_unregister; | |
859 | } | |
75784c00 | 860 | if (css_chsc_characteristics.secm) { |
7c9f4e3a | 861 | ret = device_create_file(&css->device, |
7e560814 CH |
862 | &dev_attr_cm_enable); |
863 | if (ret) | |
864 | goto out_device; | |
865 | } | |
7c9f4e3a | 866 | ret = device_register(&css->pseudo_subchannel->dev); |
c6304933 SO |
867 | if (ret) { |
868 | put_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 | 869 | goto out_file; |
c6304933 | 870 | } |
a28c6944 | 871 | } |
a55360df CH |
872 | ret = register_reboot_notifier(&css_reboot_notifier); |
873 | if (ret) | |
a2164b81 | 874 | goto out_unregister; |
dcbd16d5 SO |
875 | ret = register_pm_notifier(&css_power_notifier); |
876 | if (ret) { | |
877 | unregister_reboot_notifier(&css_reboot_notifier); | |
878 | goto out_unregister; | |
879 | } | |
1da177e4 LT |
880 | css_init_done = 1; |
881 | ||
3a3fc29a | 882 | /* Enable default isc for I/O subchannels. */ |
6ef556cc | 883 | isc_register(IO_SCH_ISC); |
1da177e4 | 884 | |
1da177e4 | 885 | return 0; |
d7b5a4c9 | 886 | out_file: |
a2164b81 CH |
887 | if (css_chsc_characteristics.secm) |
888 | device_remove_file(&channel_subsystems[i]->device, | |
889 | &dev_attr_cm_enable); | |
7e560814 | 890 | out_device: |
7c9f4e3a | 891 | device_unregister(&channel_subsystems[i]->device); |
fb6958a5 | 892 | out_unregister: |
a28c6944 | 893 | while (i > 0) { |
7c9f4e3a CH |
894 | struct channel_subsystem *css; |
895 | ||
a28c6944 | 896 | i--; |
7c9f4e3a CH |
897 | css = channel_subsystems[i]; |
898 | device_unregister(&css->pseudo_subchannel->dev); | |
a2164b81 | 899 | css->pseudo_subchannel = NULL; |
75784c00 | 900 | if (css_chsc_characteristics.secm) |
7c9f4e3a | 901 | device_remove_file(&css->device, |
495a5b45 | 902 | &dev_attr_cm_enable); |
7c9f4e3a | 903 | device_unregister(&css->device); |
a28c6944 | 904 | } |
1da177e4 LT |
905 | bus_unregister(&css_bus_type); |
906 | out: | |
f5daba1d | 907 | crw_unregister_handler(CRW_RSC_CSS); |
4434a38c | 908 | chsc_free_sei_area(); |
b827d1c8 | 909 | idset_free(slow_subchannel_set); |
e6d5a428 ME |
910 | pr_alert("The CSS device driver initialization failed with " |
911 | "errno=%d\n", ret); | |
1da177e4 LT |
912 | return ret; |
913 | } | |
914 | ||
2f17644d SO |
915 | static void __init css_bus_cleanup(void) |
916 | { | |
917 | struct channel_subsystem *css; | |
918 | int i; | |
919 | ||
920 | for (i = 0; i <= __MAX_CSSID; i++) { | |
921 | css = channel_subsystems[i]; | |
922 | device_unregister(&css->pseudo_subchannel->dev); | |
923 | css->pseudo_subchannel = NULL; | |
924 | if (css_chsc_characteristics.secm) | |
925 | device_remove_file(&css->device, &dev_attr_cm_enable); | |
926 | device_unregister(&css->device); | |
927 | } | |
928 | bus_unregister(&css_bus_type); | |
929 | crw_unregister_handler(CRW_RSC_CSS); | |
930 | chsc_free_sei_area(); | |
b827d1c8 | 931 | idset_free(slow_subchannel_set); |
2f17644d SO |
932 | isc_unregister(IO_SCH_ISC); |
933 | } | |
934 | ||
935 | static int __init channel_subsystem_init(void) | |
936 | { | |
937 | int ret; | |
938 | ||
939 | ret = css_bus_init(); | |
940 | if (ret) | |
941 | return ret; | |
942 | ||
943 | ret = io_subchannel_init(); | |
944 | if (ret) | |
945 | css_bus_cleanup(); | |
946 | ||
947 | return ret; | |
948 | } | |
949 | subsys_initcall(channel_subsystem_init); | |
950 | ||
8ea7f559 SO |
951 | static int css_settle(struct device_driver *drv, void *unused) |
952 | { | |
953 | struct css_driver *cssdrv = to_cssdriver(drv); | |
954 | ||
955 | if (cssdrv->settle) | |
956 | cssdrv->settle(); | |
957 | return 0; | |
958 | } | |
959 | ||
2f17644d SO |
960 | /* |
961 | * Wait for the initialization of devices to finish, to make sure we are | |
962 | * done with our setup if the search for the root device starts. | |
963 | */ | |
964 | static int __init channel_subsystem_init_sync(void) | |
965 | { | |
703e5c99 SO |
966 | /* Start initial subchannel evaluation. */ |
967 | css_schedule_eval_all(); | |
25530553 SO |
968 | /* Wait for the evaluation of subchannels to finish. */ |
969 | wait_event(css_eval_wq, atomic_read(&css_eval_scheduled) == 0); | |
8ea7f559 SO |
970 | /* Wait for the subchannel type specific initialization to finish */ |
971 | return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle); | |
2f17644d SO |
972 | } |
973 | subsys_initcall_sync(channel_subsystem_init_sync); | |
974 | ||
d7b5a4c9 CH |
975 | int sch_is_pseudo_sch(struct subchannel *sch) |
976 | { | |
977 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
978 | } | |
979 | ||
f08adc00 | 980 | static int css_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 981 | { |
084325d8 CH |
982 | struct subchannel *sch = to_subchannel(dev); |
983 | struct css_driver *driver = to_cssdriver(drv); | |
f08adc00 | 984 | struct css_device_id *id; |
1da177e4 | 985 | |
f08adc00 CH |
986 | for (id = driver->subchannel_type; id->match_flags; id++) { |
987 | if (sch->st == id->type) | |
988 | return 1; | |
989 | } | |
1da177e4 LT |
990 | |
991 | return 0; | |
992 | } | |
993 | ||
98c13c28 | 994 | static int css_probe(struct device *dev) |
8bbace7e CH |
995 | { |
996 | struct subchannel *sch; | |
98c13c28 | 997 | int ret; |
8bbace7e CH |
998 | |
999 | sch = to_subchannel(dev); | |
084325d8 | 1000 | sch->driver = to_cssdriver(dev->driver); |
98c13c28 CH |
1001 | ret = sch->driver->probe ? sch->driver->probe(sch) : 0; |
1002 | if (ret) | |
1003 | sch->driver = NULL; | |
1004 | return ret; | |
8bbace7e CH |
1005 | } |
1006 | ||
98c13c28 | 1007 | static int css_remove(struct device *dev) |
8bbace7e CH |
1008 | { |
1009 | struct subchannel *sch; | |
98c13c28 | 1010 | int ret; |
8bbace7e CH |
1011 | |
1012 | sch = to_subchannel(dev); | |
98c13c28 CH |
1013 | ret = sch->driver->remove ? sch->driver->remove(sch) : 0; |
1014 | sch->driver = NULL; | |
1015 | return ret; | |
8bbace7e CH |
1016 | } |
1017 | ||
98c13c28 | 1018 | static void css_shutdown(struct device *dev) |
8bbace7e CH |
1019 | { |
1020 | struct subchannel *sch; | |
1021 | ||
1022 | sch = to_subchannel(dev); | |
98c13c28 | 1023 | if (sch->driver && sch->driver->shutdown) |
8bbace7e CH |
1024 | sch->driver->shutdown(sch); |
1025 | } | |
1026 | ||
7e9db9ea CH |
1027 | static int css_uevent(struct device *dev, struct kobj_uevent_env *env) |
1028 | { | |
1029 | struct subchannel *sch = to_subchannel(dev); | |
1030 | int ret; | |
1031 | ||
1032 | ret = add_uevent_var(env, "ST=%01X", sch->st); | |
1033 | if (ret) | |
1034 | return ret; | |
1035 | ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); | |
1036 | return ret; | |
1037 | } | |
1038 | ||
dcbd16d5 SO |
1039 | static int css_pm_prepare(struct device *dev) |
1040 | { | |
1041 | struct subchannel *sch = to_subchannel(dev); | |
1042 | struct css_driver *drv; | |
1043 | ||
1044 | if (mutex_is_locked(&sch->reg_mutex)) | |
1045 | return -EAGAIN; | |
1046 | if (!sch->dev.driver) | |
1047 | return 0; | |
1048 | drv = to_cssdriver(sch->dev.driver); | |
1049 | /* Notify drivers that they may not register children. */ | |
1050 | return drv->prepare ? drv->prepare(sch) : 0; | |
1051 | } | |
1052 | ||
1053 | static void css_pm_complete(struct device *dev) | |
1054 | { | |
1055 | struct subchannel *sch = to_subchannel(dev); | |
1056 | struct css_driver *drv; | |
1057 | ||
1058 | if (!sch->dev.driver) | |
1059 | return; | |
1060 | drv = to_cssdriver(sch->dev.driver); | |
1061 | if (drv->complete) | |
1062 | drv->complete(sch); | |
1063 | } | |
1064 | ||
1065 | static int css_pm_freeze(struct device *dev) | |
1066 | { | |
1067 | struct subchannel *sch = to_subchannel(dev); | |
1068 | struct css_driver *drv; | |
1069 | ||
1070 | if (!sch->dev.driver) | |
1071 | return 0; | |
1072 | drv = to_cssdriver(sch->dev.driver); | |
1073 | return drv->freeze ? drv->freeze(sch) : 0; | |
1074 | } | |
1075 | ||
1076 | static int css_pm_thaw(struct device *dev) | |
1077 | { | |
1078 | struct subchannel *sch = to_subchannel(dev); | |
1079 | struct css_driver *drv; | |
1080 | ||
1081 | if (!sch->dev.driver) | |
1082 | return 0; | |
1083 | drv = to_cssdriver(sch->dev.driver); | |
1084 | return drv->thaw ? drv->thaw(sch) : 0; | |
1085 | } | |
1086 | ||
1087 | static int css_pm_restore(struct device *dev) | |
1088 | { | |
1089 | struct subchannel *sch = to_subchannel(dev); | |
1090 | struct css_driver *drv; | |
1091 | ||
1092 | if (!sch->dev.driver) | |
1093 | return 0; | |
1094 | drv = to_cssdriver(sch->dev.driver); | |
1095 | return drv->restore ? drv->restore(sch) : 0; | |
1096 | } | |
1097 | ||
1098 | static struct dev_pm_ops css_pm_ops = { | |
1099 | .prepare = css_pm_prepare, | |
1100 | .complete = css_pm_complete, | |
1101 | .freeze = css_pm_freeze, | |
1102 | .thaw = css_pm_thaw, | |
1103 | .restore = css_pm_restore, | |
1104 | }; | |
1105 | ||
1da177e4 | 1106 | struct bus_type css_bus_type = { |
8bbace7e CH |
1107 | .name = "css", |
1108 | .match = css_bus_match, | |
1109 | .probe = css_probe, | |
1110 | .remove = css_remove, | |
1111 | .shutdown = css_shutdown, | |
7e9db9ea | 1112 | .uevent = css_uevent, |
dcbd16d5 | 1113 | .pm = &css_pm_ops, |
1da177e4 LT |
1114 | }; |
1115 | ||
25b7bb58 CH |
1116 | /** |
1117 | * css_driver_register - register a css driver | |
1118 | * @cdrv: css driver to register | |
1119 | * | |
1120 | * This is mainly a wrapper around driver_register that sets name | |
1121 | * and bus_type in the embedded struct device_driver correctly. | |
1122 | */ | |
1123 | int css_driver_register(struct css_driver *cdrv) | |
1124 | { | |
1125 | cdrv->drv.name = cdrv->name; | |
1126 | cdrv->drv.bus = &css_bus_type; | |
4beee646 | 1127 | cdrv->drv.owner = cdrv->owner; |
25b7bb58 CH |
1128 | return driver_register(&cdrv->drv); |
1129 | } | |
1130 | EXPORT_SYMBOL_GPL(css_driver_register); | |
1131 | ||
1132 | /** | |
1133 | * css_driver_unregister - unregister a css driver | |
1134 | * @cdrv: css driver to unregister | |
1135 | * | |
1136 | * This is a wrapper around driver_unregister. | |
1137 | */ | |
1138 | void css_driver_unregister(struct css_driver *cdrv) | |
1139 | { | |
1140 | driver_unregister(&cdrv->drv); | |
1141 | } | |
1142 | EXPORT_SYMBOL_GPL(css_driver_unregister); | |
1143 | ||
1da177e4 LT |
1144 | MODULE_LICENSE("GPL"); |
1145 | EXPORT_SYMBOL(css_bus_type); |