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 | ||
390935ac PO |
136 | static void css_sch_todo(struct work_struct *work); |
137 | ||
1da177e4 | 138 | static struct subchannel * |
a8237fc4 | 139 | css_alloc_subchannel(struct subchannel_id schid) |
1da177e4 LT |
140 | { |
141 | struct subchannel *sch; | |
142 | int ret; | |
143 | ||
144 | sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA); | |
145 | if (sch == NULL) | |
146 | return ERR_PTR(-ENOMEM); | |
a8237fc4 | 147 | ret = cio_validate_subchannel (sch, schid); |
1da177e4 LT |
148 | if (ret < 0) { |
149 | kfree(sch); | |
150 | return ERR_PTR(ret); | |
151 | } | |
390935ac | 152 | INIT_WORK(&sch->todo_work, css_sch_todo); |
1da177e4 LT |
153 | return sch; |
154 | } | |
155 | ||
1da177e4 LT |
156 | static void |
157 | css_subchannel_release(struct device *dev) | |
158 | { | |
159 | struct subchannel *sch; | |
160 | ||
161 | sch = to_subchannel(dev); | |
2ec22984 | 162 | if (!cio_is_console(sch->schid)) { |
1da73bc8 PO |
163 | /* Reset intparm to zeroes. */ |
164 | sch->config.intparm = 0; | |
165 | cio_commit_config(sch); | |
2ec22984 | 166 | kfree(sch->lock); |
1da177e4 | 167 | kfree(sch); |
2ec22984 | 168 | } |
1da177e4 LT |
169 | } |
170 | ||
07c6a338 | 171 | static int css_sch_device_register(struct subchannel *sch) |
6ab4879a CH |
172 | { |
173 | int ret; | |
174 | ||
175 | mutex_lock(&sch->reg_mutex); | |
6ee4fec6 SO |
176 | dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, |
177 | sch->schid.sch_no); | |
6ab4879a CH |
178 | ret = device_register(&sch->dev); |
179 | mutex_unlock(&sch->reg_mutex); | |
180 | return ret; | |
181 | } | |
182 | ||
44a1c19e CH |
183 | /** |
184 | * css_sch_device_unregister - unregister a subchannel | |
185 | * @sch: subchannel to be unregistered | |
186 | */ | |
6ab4879a CH |
187 | void css_sch_device_unregister(struct subchannel *sch) |
188 | { | |
189 | mutex_lock(&sch->reg_mutex); | |
ef60cd13 SO |
190 | if (device_is_registered(&sch->dev)) |
191 | device_unregister(&sch->dev); | |
6ab4879a CH |
192 | mutex_unlock(&sch->reg_mutex); |
193 | } | |
44a1c19e | 194 | EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
6ab4879a | 195 | |
390935ac PO |
196 | static void css_sch_todo(struct work_struct *work) |
197 | { | |
198 | struct subchannel *sch; | |
199 | enum sch_todo todo; | |
200 | ||
201 | sch = container_of(work, struct subchannel, todo_work); | |
202 | /* Find out todo. */ | |
203 | spin_lock_irq(sch->lock); | |
204 | todo = sch->todo; | |
205 | CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid, | |
206 | sch->schid.sch_no, todo); | |
207 | sch->todo = SCH_TODO_NOTHING; | |
208 | spin_unlock_irq(sch->lock); | |
209 | /* Perform todo. */ | |
210 | if (todo == SCH_TODO_UNREG) | |
211 | css_sch_device_unregister(sch); | |
212 | /* Release workqueue ref. */ | |
213 | put_device(&sch->dev); | |
214 | } | |
215 | ||
216 | /** | |
217 | * css_sched_sch_todo - schedule a subchannel operation | |
218 | * @sch: subchannel | |
219 | * @todo: todo | |
220 | * | |
221 | * Schedule the operation identified by @todo to be performed on the slow path | |
222 | * workqueue. Do nothing if another operation with higher priority is already | |
223 | * scheduled. Needs to be called with subchannel lock held. | |
224 | */ | |
225 | void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo) | |
226 | { | |
227 | CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d\n", | |
228 | sch->schid.ssid, sch->schid.sch_no, todo); | |
229 | if (sch->todo >= todo) | |
230 | return; | |
231 | /* Get workqueue ref. */ | |
232 | if (!get_device(&sch->dev)) | |
233 | return; | |
234 | sch->todo = todo; | |
235 | if (!queue_work(slow_path_wq, &sch->todo_work)) { | |
236 | /* Already queued, release workqueue ref. */ | |
237 | put_device(&sch->dev); | |
238 | } | |
239 | } | |
240 | ||
7ad6a249 PO |
241 | static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) |
242 | { | |
243 | int i; | |
244 | int mask; | |
245 | ||
246 | memset(ssd, 0, sizeof(struct chsc_ssd_info)); | |
247 | ssd->path_mask = pmcw->pim; | |
248 | for (i = 0; i < 8; i++) { | |
249 | mask = 0x80 >> i; | |
250 | if (pmcw->pim & mask) { | |
251 | chp_id_init(&ssd->chpid[i]); | |
252 | ssd->chpid[i].id = pmcw->chpid[i]; | |
253 | } | |
254 | } | |
255 | } | |
256 | ||
257 | static void ssd_register_chpids(struct chsc_ssd_info *ssd) | |
258 | { | |
259 | int i; | |
260 | int mask; | |
261 | ||
262 | for (i = 0; i < 8; i++) { | |
263 | mask = 0x80 >> i; | |
264 | if (ssd->path_mask & mask) | |
265 | if (!chp_is_registered(ssd->chpid[i])) | |
266 | chp_new(ssd->chpid[i]); | |
267 | } | |
268 | } | |
269 | ||
270 | void css_update_ssd_info(struct subchannel *sch) | |
271 | { | |
272 | int ret; | |
273 | ||
274 | if (cio_is_console(sch->schid)) { | |
275 | /* Console is initialized too early for functions requiring | |
276 | * memory allocation. */ | |
277 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
278 | } else { | |
279 | ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); | |
280 | if (ret) | |
281 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
282 | ssd_register_chpids(&sch->ssd_info); | |
283 | } | |
284 | } | |
285 | ||
7e9db9ea CH |
286 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
287 | char *buf) | |
288 | { | |
289 | struct subchannel *sch = to_subchannel(dev); | |
290 | ||
291 | return sprintf(buf, "%01x\n", sch->st); | |
292 | } | |
293 | ||
294 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
295 | ||
296 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
297 | char *buf) | |
298 | { | |
299 | struct subchannel *sch = to_subchannel(dev); | |
300 | ||
301 | return sprintf(buf, "css:t%01X\n", sch->st); | |
302 | } | |
303 | ||
304 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); | |
305 | ||
306 | static struct attribute *subch_attrs[] = { | |
307 | &dev_attr_type.attr, | |
308 | &dev_attr_modalias.attr, | |
309 | NULL, | |
310 | }; | |
311 | ||
312 | static struct attribute_group subch_attr_group = { | |
313 | .attrs = subch_attrs, | |
314 | }; | |
315 | ||
a4dbd674 | 316 | static const struct attribute_group *default_subch_attr_groups[] = { |
7e9db9ea CH |
317 | &subch_attr_group, |
318 | NULL, | |
319 | }; | |
320 | ||
7ad6a249 | 321 | static int css_register_subchannel(struct subchannel *sch) |
1da177e4 LT |
322 | { |
323 | int ret; | |
324 | ||
325 | /* Initialize the subchannel structure */ | |
7c9f4e3a | 326 | sch->dev.parent = &channel_subsystems[0]->device; |
1da177e4 LT |
327 | sch->dev.bus = &css_bus_type; |
328 | sch->dev.release = &css_subchannel_release; | |
7e9db9ea | 329 | sch->dev.groups = default_subch_attr_groups; |
5bf04b20 CH |
330 | /* |
331 | * We don't want to generate uevents for I/O subchannels that don't | |
332 | * have a working ccw device behind them since they will be | |
333 | * unregistered before they can be used anyway, so we delay the add | |
334 | * uevent until after device recognition was successful. | |
7e9db9ea CH |
335 | * Note that we suppress the uevent for all subchannel types; |
336 | * the subchannel driver can decide itself when it wants to inform | |
337 | * userspace of its existence. | |
5bf04b20 | 338 | */ |
f67f129e | 339 | dev_set_uevent_suppress(&sch->dev, 1); |
7ad6a249 | 340 | css_update_ssd_info(sch); |
1da177e4 | 341 | /* make it known to the system */ |
6ab4879a | 342 | ret = css_sch_device_register(sch); |
7674da77 | 343 | if (ret) { |
e556bbbd CH |
344 | CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n", |
345 | sch->schid.ssid, sch->schid.sch_no, ret); | |
7674da77 CH |
346 | return ret; |
347 | } | |
7e9db9ea CH |
348 | if (!sch->driver) { |
349 | /* | |
350 | * No driver matched. Generate the uevent now so that | |
351 | * a fitting driver module may be loaded based on the | |
352 | * modalias. | |
353 | */ | |
f67f129e | 354 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea CH |
355 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
356 | } | |
1da177e4 LT |
357 | return ret; |
358 | } | |
359 | ||
c820de39 | 360 | int css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
361 | { |
362 | int ret; | |
363 | struct subchannel *sch; | |
364 | ||
703e5c99 SO |
365 | if (cio_is_console(schid)) |
366 | sch = cio_get_console_subchannel(); | |
367 | else { | |
368 | sch = css_alloc_subchannel(schid); | |
369 | if (IS_ERR(sch)) | |
370 | return PTR_ERR(sch); | |
371 | } | |
1da177e4 | 372 | ret = css_register_subchannel(sch); |
703e5c99 SO |
373 | if (ret) { |
374 | if (!cio_is_console(schid)) | |
375 | put_device(&sch->dev); | |
376 | } | |
1da177e4 LT |
377 | return ret; |
378 | } | |
379 | ||
b0744bd2 CH |
380 | static int |
381 | check_subchannel(struct device * dev, void * data) | |
382 | { | |
383 | struct subchannel *sch; | |
a8237fc4 | 384 | struct subchannel_id *schid = data; |
b0744bd2 CH |
385 | |
386 | sch = to_subchannel(dev); | |
a8237fc4 | 387 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
388 | } |
389 | ||
1da177e4 | 390 | struct subchannel * |
a8237fc4 | 391 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 392 | { |
1da177e4 LT |
393 | struct device *dev; |
394 | ||
b0744bd2 | 395 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 396 | &schid, check_subchannel); |
1da177e4 | 397 | |
b0744bd2 | 398 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
399 | } |
400 | ||
b279a4f5 CH |
401 | /** |
402 | * css_sch_is_valid() - check if a subchannel is valid | |
403 | * @schib: subchannel information block for the subchannel | |
404 | */ | |
405 | int css_sch_is_valid(struct schib *schib) | |
406 | { | |
407 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) | |
408 | return 0; | |
b3a686f4 CH |
409 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) |
410 | return 0; | |
b279a4f5 CH |
411 | return 1; |
412 | } | |
413 | EXPORT_SYMBOL_GPL(css_sch_is_valid); | |
414 | ||
564337f3 PO |
415 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) |
416 | { | |
417 | struct schib schib; | |
418 | ||
419 | if (!slow) { | |
420 | /* Will be done on the slow path. */ | |
421 | return -EAGAIN; | |
422 | } | |
b279a4f5 | 423 | if (stsch_err(schid, &schib) || !css_sch_is_valid(&schib)) { |
564337f3 PO |
424 | /* Unusable - ignore. */ |
425 | return 0; | |
1da177e4 | 426 | } |
5d6e6b6f PO |
427 | CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new\n", schid.ssid, |
428 | schid.sch_no); | |
564337f3 PO |
429 | |
430 | return css_probe_device(schid); | |
431 | } | |
432 | ||
c820de39 CH |
433 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) |
434 | { | |
435 | int ret = 0; | |
436 | ||
437 | if (sch->driver) { | |
438 | if (sch->driver->sch_event) | |
439 | ret = sch->driver->sch_event(sch, slow); | |
440 | else | |
441 | dev_dbg(&sch->dev, | |
442 | "Got subchannel machine check but " | |
443 | "no sch_event handler provided.\n"); | |
444 | } | |
5d6e6b6f PO |
445 | if (ret != 0 && ret != -EAGAIN) { |
446 | CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n", | |
447 | sch->schid.ssid, sch->schid.sch_no, ret); | |
448 | } | |
c820de39 CH |
449 | return ret; |
450 | } | |
451 | ||
83b3370c | 452 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
453 | { |
454 | struct subchannel *sch; | |
455 | int ret; | |
456 | ||
457 | sch = get_subchannel_by_schid(schid); | |
458 | if (sch) { | |
459 | ret = css_evaluate_known_subchannel(sch, slow); | |
460 | put_device(&sch->dev); | |
461 | } else | |
462 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
463 | if (ret == -EAGAIN) |
464 | css_schedule_eval(schid); | |
1da177e4 LT |
465 | } |
466 | ||
83b3370c PO |
467 | static struct idset *slow_subchannel_set; |
468 | static spinlock_t slow_subchannel_lock; | |
25530553 SO |
469 | static wait_queue_head_t css_eval_wq; |
470 | static atomic_t css_eval_scheduled; | |
83b3370c PO |
471 | |
472 | static int __init slow_subchannel_init(void) | |
1da177e4 | 473 | { |
83b3370c | 474 | spin_lock_init(&slow_subchannel_lock); |
25530553 SO |
475 | atomic_set(&css_eval_scheduled, 0); |
476 | init_waitqueue_head(&css_eval_wq); | |
83b3370c PO |
477 | slow_subchannel_set = idset_sch_new(); |
478 | if (!slow_subchannel_set) { | |
e556bbbd | 479 | CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); |
83b3370c PO |
480 | return -ENOMEM; |
481 | } | |
482 | return 0; | |
1da177e4 LT |
483 | } |
484 | ||
e82a1567 | 485 | static int slow_eval_known_fn(struct subchannel *sch, void *data) |
1da177e4 | 486 | { |
e82a1567 PO |
487 | int eval; |
488 | int rc; | |
1da177e4 LT |
489 | |
490 | spin_lock_irq(&slow_subchannel_lock); | |
e82a1567 PO |
491 | eval = idset_sch_contains(slow_subchannel_set, sch->schid); |
492 | idset_sch_del(slow_subchannel_set, sch->schid); | |
493 | spin_unlock_irq(&slow_subchannel_lock); | |
494 | if (eval) { | |
495 | rc = css_evaluate_known_subchannel(sch, 1); | |
496 | if (rc == -EAGAIN) | |
497 | css_schedule_eval(sch->schid); | |
1da177e4 | 498 | } |
e82a1567 PO |
499 | return 0; |
500 | } | |
501 | ||
502 | static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) | |
503 | { | |
504 | int eval; | |
505 | int rc = 0; | |
506 | ||
507 | spin_lock_irq(&slow_subchannel_lock); | |
508 | eval = idset_sch_contains(slow_subchannel_set, schid); | |
509 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 510 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
511 | if (eval) { |
512 | rc = css_evaluate_new_subchannel(schid, 1); | |
513 | switch (rc) { | |
514 | case -EAGAIN: | |
515 | css_schedule_eval(schid); | |
516 | rc = 0; | |
517 | break; | |
518 | case -ENXIO: | |
519 | case -ENOMEM: | |
520 | case -EIO: | |
521 | /* These should abort looping */ | |
522 | break; | |
523 | default: | |
524 | rc = 0; | |
525 | } | |
526 | } | |
527 | return rc; | |
528 | } | |
529 | ||
530 | static void css_slow_path_func(struct work_struct *unused) | |
531 | { | |
25530553 SO |
532 | unsigned long flags; |
533 | ||
e82a1567 PO |
534 | CIO_TRACE_EVENT(4, "slowpath"); |
535 | for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, | |
536 | NULL); | |
25530553 SO |
537 | spin_lock_irqsave(&slow_subchannel_lock, flags); |
538 | if (idset_is_empty(slow_subchannel_set)) { | |
539 | atomic_set(&css_eval_scheduled, 0); | |
540 | wake_up(&css_eval_wq); | |
541 | } | |
542 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
1da177e4 LT |
543 | } |
544 | ||
83b3370c | 545 | static DECLARE_WORK(slow_path_work, css_slow_path_func); |
1da177e4 LT |
546 | struct workqueue_struct *slow_path_wq; |
547 | ||
83b3370c PO |
548 | void css_schedule_eval(struct subchannel_id schid) |
549 | { | |
550 | unsigned long flags; | |
551 | ||
552 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
553 | idset_sch_add(slow_subchannel_set, schid); | |
25530553 | 554 | atomic_set(&css_eval_scheduled, 1); |
83b3370c PO |
555 | queue_work(slow_path_wq, &slow_path_work); |
556 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
557 | } | |
558 | ||
559 | void css_schedule_eval_all(void) | |
560 | { | |
561 | unsigned long flags; | |
562 | ||
563 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
564 | idset_fill(slow_subchannel_set); | |
25530553 | 565 | atomic_set(&css_eval_scheduled, 1); |
83b3370c PO |
566 | queue_work(slow_path_wq, &slow_path_work); |
567 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
568 | } | |
569 | ||
703e5c99 | 570 | static int __unset_registered(struct device *dev, void *data) |
22806dc1 | 571 | { |
703e5c99 SO |
572 | struct idset *set = data; |
573 | struct subchannel *sch = to_subchannel(dev); | |
40154b82 | 574 | |
703e5c99 SO |
575 | idset_sch_del(set, sch->schid); |
576 | return 0; | |
56e25e97 PO |
577 | } |
578 | ||
703e5c99 | 579 | void css_schedule_eval_all_unreg(void) |
40154b82 | 580 | { |
703e5c99 SO |
581 | unsigned long flags; |
582 | struct idset *unreg_set; | |
40154b82 | 583 | |
703e5c99 SO |
584 | /* Find unregistered subchannels. */ |
585 | unreg_set = idset_sch_new(); | |
586 | if (!unreg_set) { | |
587 | /* Fallback. */ | |
588 | css_schedule_eval_all(); | |
56e25e97 PO |
589 | return; |
590 | } | |
703e5c99 SO |
591 | idset_fill(unreg_set); |
592 | bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered); | |
593 | /* Apply to slow_subchannel_set. */ | |
594 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
595 | idset_add_set(slow_subchannel_set, unreg_set); | |
596 | atomic_set(&css_eval_scheduled, 1); | |
597 | queue_work(slow_path_wq, &slow_path_work); | |
598 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
599 | idset_free(unreg_set); | |
40154b82 PO |
600 | } |
601 | ||
703e5c99 SO |
602 | void css_wait_for_slow_path(void) |
603 | { | |
604 | flush_workqueue(slow_path_wq); | |
605 | } | |
40154b82 PO |
606 | |
607 | /* Schedule reprobing of all unregistered subchannels. */ | |
608 | void css_schedule_reprobe(void) | |
609 | { | |
703e5c99 | 610 | css_schedule_eval_all_unreg(); |
40154b82 | 611 | } |
40154b82 PO |
612 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); |
613 | ||
1da177e4 LT |
614 | /* |
615 | * Called from the machine check handler for subchannel report words. | |
616 | */ | |
c1156189 | 617 | static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
1da177e4 | 618 | { |
a8237fc4 | 619 | struct subchannel_id mchk_schid; |
1da177e4 | 620 | |
c1156189 CH |
621 | if (overflow) { |
622 | css_schedule_eval_all(); | |
623 | return; | |
624 | } | |
625 | CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " | |
626 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
627 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
628 | crw0->erc, crw0->rsid); | |
629 | if (crw1) | |
630 | CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " | |
631 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
632 | crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, | |
633 | crw1->anc, crw1->erc, crw1->rsid); | |
a8237fc4 | 634 | init_subchannel_id(&mchk_schid); |
c1156189 CH |
635 | mchk_schid.sch_no = crw0->rsid; |
636 | if (crw1) | |
637 | mchk_schid.ssid = (crw1->rsid >> 8) & 3; | |
fb6958a5 | 638 | |
c1156189 | 639 | /* |
1da177e4 LT |
640 | * Since we are always presented with IPI in the CRW, we have to |
641 | * use stsch() to find out if the subchannel in question has come | |
642 | * or gone. | |
643 | */ | |
83b3370c | 644 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
645 | } |
646 | ||
647 | static void __init | |
a28c6944 | 648 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 649 | { |
75784c00 | 650 | if (css_general_characteristics.mcss) { |
a28c6944 CH |
651 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
652 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
653 | } else { | |
1da177e4 | 654 | #ifdef CONFIG_SMP |
7b468488 | 655 | css->global_pgid.pgid_high.cpu_addr = stap(); |
1da177e4 | 656 | #else |
a28c6944 | 657 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
658 | #endif |
659 | } | |
e86a6ed6 HC |
660 | css->global_pgid.cpu_id = S390_lowcore.cpu_id.ident; |
661 | css->global_pgid.cpu_model = S390_lowcore.cpu_id.machine; | |
a28c6944 CH |
662 | css->global_pgid.tod_high = tod_high; |
663 | ||
664 | } | |
665 | ||
3b793060 CH |
666 | static void |
667 | channel_subsystem_release(struct device *dev) | |
668 | { | |
669 | struct channel_subsystem *css; | |
670 | ||
671 | css = to_css(dev); | |
495a5b45 | 672 | mutex_destroy(&css->mutex); |
a2164b81 CH |
673 | if (css->pseudo_subchannel) { |
674 | /* Implies that it has been generated but never registered. */ | |
675 | css_subchannel_release(&css->pseudo_subchannel->dev); | |
676 | css->pseudo_subchannel = NULL; | |
677 | } | |
3b793060 CH |
678 | kfree(css); |
679 | } | |
680 | ||
495a5b45 CH |
681 | static ssize_t |
682 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
683 | char *buf) | |
684 | { | |
685 | struct channel_subsystem *css = to_css(dev); | |
8284fb19 | 686 | int ret; |
495a5b45 CH |
687 | |
688 | if (!css) | |
689 | return 0; | |
8284fb19 ME |
690 | mutex_lock(&css->mutex); |
691 | ret = sprintf(buf, "%x\n", css->cm_enabled); | |
692 | mutex_unlock(&css->mutex); | |
693 | return ret; | |
495a5b45 CH |
694 | } |
695 | ||
696 | static ssize_t | |
697 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
698 | const char *buf, size_t count) | |
699 | { | |
700 | struct channel_subsystem *css = to_css(dev); | |
701 | int ret; | |
2f972202 | 702 | unsigned long val; |
495a5b45 | 703 | |
2f972202 CH |
704 | ret = strict_strtoul(buf, 16, &val); |
705 | if (ret) | |
706 | return ret; | |
8284fb19 | 707 | mutex_lock(&css->mutex); |
2f972202 CH |
708 | switch (val) { |
709 | case 0: | |
495a5b45 CH |
710 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; |
711 | break; | |
2f972202 | 712 | case 1: |
495a5b45 CH |
713 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); |
714 | break; | |
715 | default: | |
716 | ret = -EINVAL; | |
717 | } | |
8284fb19 | 718 | mutex_unlock(&css->mutex); |
495a5b45 CH |
719 | return ret < 0 ? ret : count; |
720 | } | |
721 | ||
722 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
723 | ||
4d284cac | 724 | static int __init setup_css(int nr) |
a28c6944 CH |
725 | { |
726 | u32 tod_high; | |
d7b5a4c9 | 727 | int ret; |
7c9f4e3a | 728 | struct channel_subsystem *css; |
a28c6944 | 729 | |
7c9f4e3a CH |
730 | css = channel_subsystems[nr]; |
731 | memset(css, 0, sizeof(struct channel_subsystem)); | |
732 | css->pseudo_subchannel = | |
733 | kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL); | |
734 | if (!css->pseudo_subchannel) | |
d7b5a4c9 | 735 | return -ENOMEM; |
7c9f4e3a CH |
736 | css->pseudo_subchannel->dev.parent = &css->device; |
737 | css->pseudo_subchannel->dev.release = css_subchannel_release; | |
1bf5b285 | 738 | dev_set_name(&css->pseudo_subchannel->dev, "defunct"); |
5d6e6b6f | 739 | mutex_init(&css->pseudo_subchannel->reg_mutex); |
7c9f4e3a | 740 | ret = cio_create_sch_lock(css->pseudo_subchannel); |
d7b5a4c9 | 741 | if (ret) { |
7c9f4e3a | 742 | kfree(css->pseudo_subchannel); |
d7b5a4c9 CH |
743 | return ret; |
744 | } | |
7c9f4e3a CH |
745 | mutex_init(&css->mutex); |
746 | css->valid = 1; | |
747 | css->cssid = nr; | |
1bf5b285 | 748 | dev_set_name(&css->device, "css%x", nr); |
7c9f4e3a | 749 | css->device.release = channel_subsystem_release; |
a28c6944 | 750 | tod_high = (u32) (get_clock() >> 32); |
7c9f4e3a | 751 | css_generate_pgid(css, tod_high); |
d7b5a4c9 | 752 | return 0; |
1da177e4 LT |
753 | } |
754 | ||
a55360df CH |
755 | static int css_reboot_event(struct notifier_block *this, |
756 | unsigned long event, | |
757 | void *ptr) | |
758 | { | |
759 | int ret, i; | |
760 | ||
761 | ret = NOTIFY_DONE; | |
762 | for (i = 0; i <= __MAX_CSSID; i++) { | |
763 | struct channel_subsystem *css; | |
764 | ||
765 | css = channel_subsystems[i]; | |
8284fb19 | 766 | mutex_lock(&css->mutex); |
a55360df CH |
767 | if (css->cm_enabled) |
768 | if (chsc_secm(css, 0)) | |
769 | ret = NOTIFY_BAD; | |
8284fb19 | 770 | mutex_unlock(&css->mutex); |
a55360df CH |
771 | } |
772 | ||
773 | return ret; | |
774 | } | |
775 | ||
776 | static struct notifier_block css_reboot_notifier = { | |
777 | .notifier_call = css_reboot_event, | |
778 | }; | |
779 | ||
dcbd16d5 SO |
780 | /* |
781 | * Since the css devices are neither on a bus nor have a class | |
782 | * nor have a special device type, we cannot stop/restart channel | |
783 | * path measurements via the normal suspend/resume callbacks, but have | |
784 | * to use notifiers. | |
785 | */ | |
786 | static int css_power_event(struct notifier_block *this, unsigned long event, | |
787 | void *ptr) | |
788 | { | |
789 | void *secm_area; | |
790 | int ret, i; | |
791 | ||
792 | switch (event) { | |
793 | case PM_HIBERNATION_PREPARE: | |
794 | case PM_SUSPEND_PREPARE: | |
795 | ret = NOTIFY_DONE; | |
796 | for (i = 0; i <= __MAX_CSSID; i++) { | |
797 | struct channel_subsystem *css; | |
798 | ||
799 | css = channel_subsystems[i]; | |
800 | mutex_lock(&css->mutex); | |
801 | if (!css->cm_enabled) { | |
802 | mutex_unlock(&css->mutex); | |
803 | continue; | |
804 | } | |
805 | secm_area = (void *)get_zeroed_page(GFP_KERNEL | | |
806 | GFP_DMA); | |
807 | if (secm_area) { | |
808 | if (__chsc_do_secm(css, 0, secm_area)) | |
809 | ret = NOTIFY_BAD; | |
810 | free_page((unsigned long)secm_area); | |
811 | } else | |
812 | ret = NOTIFY_BAD; | |
813 | ||
814 | mutex_unlock(&css->mutex); | |
815 | } | |
816 | break; | |
817 | case PM_POST_HIBERNATION: | |
818 | case PM_POST_SUSPEND: | |
819 | ret = NOTIFY_DONE; | |
820 | for (i = 0; i <= __MAX_CSSID; i++) { | |
821 | struct channel_subsystem *css; | |
822 | ||
823 | css = channel_subsystems[i]; | |
824 | mutex_lock(&css->mutex); | |
825 | if (!css->cm_enabled) { | |
826 | mutex_unlock(&css->mutex); | |
827 | continue; | |
828 | } | |
829 | secm_area = (void *)get_zeroed_page(GFP_KERNEL | | |
830 | GFP_DMA); | |
831 | if (secm_area) { | |
832 | if (__chsc_do_secm(css, 1, secm_area)) | |
833 | ret = NOTIFY_BAD; | |
834 | free_page((unsigned long)secm_area); | |
835 | } else | |
836 | ret = NOTIFY_BAD; | |
837 | ||
838 | mutex_unlock(&css->mutex); | |
839 | } | |
840 | /* search for subchannels, which appeared during hibernation */ | |
841 | css_schedule_reprobe(); | |
842 | break; | |
843 | default: | |
844 | ret = NOTIFY_DONE; | |
845 | } | |
846 | return ret; | |
847 | ||
848 | } | |
849 | static struct notifier_block css_power_notifier = { | |
850 | .notifier_call = css_power_event, | |
851 | }; | |
852 | ||
1da177e4 LT |
853 | /* |
854 | * Now that the driver core is running, we can setup our channel subsystem. | |
855 | * The struct subchannel's are created during probing (except for the | |
856 | * static console subchannel). | |
857 | */ | |
2f17644d | 858 | static int __init css_bus_init(void) |
1da177e4 | 859 | { |
a28c6944 | 860 | int ret, i; |
1da177e4 | 861 | |
4434a38c CH |
862 | ret = chsc_determine_css_characteristics(); |
863 | if (ret == -ENOMEM) | |
2f17644d | 864 | goto out; |
1da177e4 | 865 | |
4434a38c CH |
866 | ret = chsc_alloc_sei_area(); |
867 | if (ret) | |
868 | goto out; | |
869 | ||
b0a285d3 SO |
870 | /* Try to enable MSS. */ |
871 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
872 | switch (ret) { | |
873 | case 0: /* Success. */ | |
874 | max_ssid = __MAX_SSID; | |
875 | break; | |
876 | case -ENOMEM: | |
877 | goto out; | |
878 | default: | |
879 | max_ssid = 0; | |
880 | } | |
881 | ||
4434a38c CH |
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 | |
a28c6944 CH |
893 | /* Setup css structure. */ |
894 | for (i = 0; i <= __MAX_CSSID; i++) { | |
7c9f4e3a CH |
895 | struct channel_subsystem *css; |
896 | ||
897 | css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
898 | if (!css) { | |
a28c6944 | 899 | ret = -ENOMEM; |
fb6958a5 | 900 | goto out_unregister; |
a28c6944 | 901 | } |
7c9f4e3a | 902 | channel_subsystems[i] = css; |
d7b5a4c9 | 903 | ret = setup_css(i); |
a2164b81 CH |
904 | if (ret) { |
905 | kfree(channel_subsystems[i]); | |
906 | goto out_unregister; | |
907 | } | |
7c9f4e3a | 908 | ret = device_register(&css->device); |
a2164b81 CH |
909 | if (ret) { |
910 | put_device(&css->device); | |
911 | goto out_unregister; | |
912 | } | |
75784c00 | 913 | if (css_chsc_characteristics.secm) { |
7c9f4e3a | 914 | ret = device_create_file(&css->device, |
7e560814 CH |
915 | &dev_attr_cm_enable); |
916 | if (ret) | |
917 | goto out_device; | |
918 | } | |
7c9f4e3a | 919 | ret = device_register(&css->pseudo_subchannel->dev); |
c6304933 SO |
920 | if (ret) { |
921 | put_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 | 922 | goto out_file; |
c6304933 | 923 | } |
a28c6944 | 924 | } |
a55360df CH |
925 | ret = register_reboot_notifier(&css_reboot_notifier); |
926 | if (ret) | |
a2164b81 | 927 | goto out_unregister; |
dcbd16d5 SO |
928 | ret = register_pm_notifier(&css_power_notifier); |
929 | if (ret) { | |
930 | unregister_reboot_notifier(&css_reboot_notifier); | |
931 | goto out_unregister; | |
932 | } | |
1da177e4 LT |
933 | css_init_done = 1; |
934 | ||
3a3fc29a | 935 | /* Enable default isc for I/O subchannels. */ |
6ef556cc | 936 | isc_register(IO_SCH_ISC); |
1da177e4 | 937 | |
1da177e4 | 938 | return 0; |
d7b5a4c9 | 939 | out_file: |
a2164b81 CH |
940 | if (css_chsc_characteristics.secm) |
941 | device_remove_file(&channel_subsystems[i]->device, | |
942 | &dev_attr_cm_enable); | |
7e560814 | 943 | out_device: |
7c9f4e3a | 944 | device_unregister(&channel_subsystems[i]->device); |
fb6958a5 | 945 | out_unregister: |
a28c6944 | 946 | while (i > 0) { |
7c9f4e3a CH |
947 | struct channel_subsystem *css; |
948 | ||
a28c6944 | 949 | i--; |
7c9f4e3a CH |
950 | css = channel_subsystems[i]; |
951 | device_unregister(&css->pseudo_subchannel->dev); | |
a2164b81 | 952 | css->pseudo_subchannel = NULL; |
75784c00 | 953 | if (css_chsc_characteristics.secm) |
7c9f4e3a | 954 | device_remove_file(&css->device, |
495a5b45 | 955 | &dev_attr_cm_enable); |
7c9f4e3a | 956 | device_unregister(&css->device); |
a28c6944 | 957 | } |
1da177e4 LT |
958 | bus_unregister(&css_bus_type); |
959 | out: | |
f5daba1d | 960 | crw_unregister_handler(CRW_RSC_CSS); |
4434a38c | 961 | chsc_free_sei_area(); |
b827d1c8 | 962 | idset_free(slow_subchannel_set); |
e6d5a428 ME |
963 | pr_alert("The CSS device driver initialization failed with " |
964 | "errno=%d\n", ret); | |
1da177e4 LT |
965 | return ret; |
966 | } | |
967 | ||
2f17644d SO |
968 | static void __init css_bus_cleanup(void) |
969 | { | |
970 | struct channel_subsystem *css; | |
971 | int i; | |
972 | ||
973 | for (i = 0; i <= __MAX_CSSID; i++) { | |
974 | css = channel_subsystems[i]; | |
975 | device_unregister(&css->pseudo_subchannel->dev); | |
976 | css->pseudo_subchannel = NULL; | |
977 | if (css_chsc_characteristics.secm) | |
978 | device_remove_file(&css->device, &dev_attr_cm_enable); | |
979 | device_unregister(&css->device); | |
980 | } | |
981 | bus_unregister(&css_bus_type); | |
982 | crw_unregister_handler(CRW_RSC_CSS); | |
983 | chsc_free_sei_area(); | |
b827d1c8 | 984 | idset_free(slow_subchannel_set); |
2f17644d SO |
985 | isc_unregister(IO_SCH_ISC); |
986 | } | |
987 | ||
988 | static int __init channel_subsystem_init(void) | |
989 | { | |
990 | int ret; | |
991 | ||
992 | ret = css_bus_init(); | |
993 | if (ret) | |
994 | return ret; | |
995 | ||
996 | ret = io_subchannel_init(); | |
997 | if (ret) | |
998 | css_bus_cleanup(); | |
999 | ||
1000 | return ret; | |
1001 | } | |
1002 | subsys_initcall(channel_subsystem_init); | |
1003 | ||
8ea7f559 SO |
1004 | static int css_settle(struct device_driver *drv, void *unused) |
1005 | { | |
1006 | struct css_driver *cssdrv = to_cssdriver(drv); | |
1007 | ||
1008 | if (cssdrv->settle) | |
1009 | cssdrv->settle(); | |
1010 | return 0; | |
1011 | } | |
1012 | ||
2f17644d SO |
1013 | /* |
1014 | * Wait for the initialization of devices to finish, to make sure we are | |
1015 | * done with our setup if the search for the root device starts. | |
1016 | */ | |
1017 | static int __init channel_subsystem_init_sync(void) | |
1018 | { | |
703e5c99 SO |
1019 | /* Start initial subchannel evaluation. */ |
1020 | css_schedule_eval_all(); | |
25530553 SO |
1021 | /* Wait for the evaluation of subchannels to finish. */ |
1022 | wait_event(css_eval_wq, atomic_read(&css_eval_scheduled) == 0); | |
8ea7f559 SO |
1023 | /* Wait for the subchannel type specific initialization to finish */ |
1024 | return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle); | |
2f17644d SO |
1025 | } |
1026 | subsys_initcall_sync(channel_subsystem_init_sync); | |
1027 | ||
d7b5a4c9 CH |
1028 | int sch_is_pseudo_sch(struct subchannel *sch) |
1029 | { | |
1030 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
1031 | } | |
1032 | ||
f08adc00 | 1033 | static int css_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1034 | { |
084325d8 CH |
1035 | struct subchannel *sch = to_subchannel(dev); |
1036 | struct css_driver *driver = to_cssdriver(drv); | |
f08adc00 | 1037 | struct css_device_id *id; |
1da177e4 | 1038 | |
f08adc00 CH |
1039 | for (id = driver->subchannel_type; id->match_flags; id++) { |
1040 | if (sch->st == id->type) | |
1041 | return 1; | |
1042 | } | |
1da177e4 LT |
1043 | |
1044 | return 0; | |
1045 | } | |
1046 | ||
98c13c28 | 1047 | static int css_probe(struct device *dev) |
8bbace7e CH |
1048 | { |
1049 | struct subchannel *sch; | |
98c13c28 | 1050 | int ret; |
8bbace7e CH |
1051 | |
1052 | sch = to_subchannel(dev); | |
084325d8 | 1053 | sch->driver = to_cssdriver(dev->driver); |
98c13c28 CH |
1054 | ret = sch->driver->probe ? sch->driver->probe(sch) : 0; |
1055 | if (ret) | |
1056 | sch->driver = NULL; | |
1057 | return ret; | |
8bbace7e CH |
1058 | } |
1059 | ||
98c13c28 | 1060 | static int css_remove(struct device *dev) |
8bbace7e CH |
1061 | { |
1062 | struct subchannel *sch; | |
98c13c28 | 1063 | int ret; |
8bbace7e CH |
1064 | |
1065 | sch = to_subchannel(dev); | |
98c13c28 CH |
1066 | ret = sch->driver->remove ? sch->driver->remove(sch) : 0; |
1067 | sch->driver = NULL; | |
1068 | return ret; | |
8bbace7e CH |
1069 | } |
1070 | ||
98c13c28 | 1071 | static void css_shutdown(struct device *dev) |
8bbace7e CH |
1072 | { |
1073 | struct subchannel *sch; | |
1074 | ||
1075 | sch = to_subchannel(dev); | |
98c13c28 | 1076 | if (sch->driver && sch->driver->shutdown) |
8bbace7e CH |
1077 | sch->driver->shutdown(sch); |
1078 | } | |
1079 | ||
7e9db9ea CH |
1080 | static int css_uevent(struct device *dev, struct kobj_uevent_env *env) |
1081 | { | |
1082 | struct subchannel *sch = to_subchannel(dev); | |
1083 | int ret; | |
1084 | ||
1085 | ret = add_uevent_var(env, "ST=%01X", sch->st); | |
1086 | if (ret) | |
1087 | return ret; | |
1088 | ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); | |
1089 | return ret; | |
1090 | } | |
1091 | ||
dcbd16d5 SO |
1092 | static int css_pm_prepare(struct device *dev) |
1093 | { | |
1094 | struct subchannel *sch = to_subchannel(dev); | |
1095 | struct css_driver *drv; | |
1096 | ||
1097 | if (mutex_is_locked(&sch->reg_mutex)) | |
1098 | return -EAGAIN; | |
1099 | if (!sch->dev.driver) | |
1100 | return 0; | |
1101 | drv = to_cssdriver(sch->dev.driver); | |
1102 | /* Notify drivers that they may not register children. */ | |
1103 | return drv->prepare ? drv->prepare(sch) : 0; | |
1104 | } | |
1105 | ||
1106 | static void css_pm_complete(struct device *dev) | |
1107 | { | |
1108 | struct subchannel *sch = to_subchannel(dev); | |
1109 | struct css_driver *drv; | |
1110 | ||
1111 | if (!sch->dev.driver) | |
1112 | return; | |
1113 | drv = to_cssdriver(sch->dev.driver); | |
1114 | if (drv->complete) | |
1115 | drv->complete(sch); | |
1116 | } | |
1117 | ||
1118 | static int css_pm_freeze(struct device *dev) | |
1119 | { | |
1120 | struct subchannel *sch = to_subchannel(dev); | |
1121 | struct css_driver *drv; | |
1122 | ||
1123 | if (!sch->dev.driver) | |
1124 | return 0; | |
1125 | drv = to_cssdriver(sch->dev.driver); | |
1126 | return drv->freeze ? drv->freeze(sch) : 0; | |
1127 | } | |
1128 | ||
1129 | static int css_pm_thaw(struct device *dev) | |
1130 | { | |
1131 | struct subchannel *sch = to_subchannel(dev); | |
1132 | struct css_driver *drv; | |
1133 | ||
1134 | if (!sch->dev.driver) | |
1135 | return 0; | |
1136 | drv = to_cssdriver(sch->dev.driver); | |
1137 | return drv->thaw ? drv->thaw(sch) : 0; | |
1138 | } | |
1139 | ||
1140 | static int css_pm_restore(struct device *dev) | |
1141 | { | |
1142 | struct subchannel *sch = to_subchannel(dev); | |
1143 | struct css_driver *drv; | |
1144 | ||
1145 | if (!sch->dev.driver) | |
1146 | return 0; | |
1147 | drv = to_cssdriver(sch->dev.driver); | |
1148 | return drv->restore ? drv->restore(sch) : 0; | |
1149 | } | |
1150 | ||
47145210 | 1151 | static const struct dev_pm_ops css_pm_ops = { |
dcbd16d5 SO |
1152 | .prepare = css_pm_prepare, |
1153 | .complete = css_pm_complete, | |
1154 | .freeze = css_pm_freeze, | |
1155 | .thaw = css_pm_thaw, | |
1156 | .restore = css_pm_restore, | |
1157 | }; | |
1158 | ||
1da177e4 | 1159 | struct bus_type css_bus_type = { |
8bbace7e CH |
1160 | .name = "css", |
1161 | .match = css_bus_match, | |
1162 | .probe = css_probe, | |
1163 | .remove = css_remove, | |
1164 | .shutdown = css_shutdown, | |
7e9db9ea | 1165 | .uevent = css_uevent, |
dcbd16d5 | 1166 | .pm = &css_pm_ops, |
1da177e4 LT |
1167 | }; |
1168 | ||
25b7bb58 CH |
1169 | /** |
1170 | * css_driver_register - register a css driver | |
1171 | * @cdrv: css driver to register | |
1172 | * | |
1173 | * This is mainly a wrapper around driver_register that sets name | |
1174 | * and bus_type in the embedded struct device_driver correctly. | |
1175 | */ | |
1176 | int css_driver_register(struct css_driver *cdrv) | |
1177 | { | |
1178 | cdrv->drv.name = cdrv->name; | |
1179 | cdrv->drv.bus = &css_bus_type; | |
4beee646 | 1180 | cdrv->drv.owner = cdrv->owner; |
25b7bb58 CH |
1181 | return driver_register(&cdrv->drv); |
1182 | } | |
1183 | EXPORT_SYMBOL_GPL(css_driver_register); | |
1184 | ||
1185 | /** | |
1186 | * css_driver_unregister - unregister a css driver | |
1187 | * @cdrv: css driver to unregister | |
1188 | * | |
1189 | * This is a wrapper around driver_unregister. | |
1190 | */ | |
1191 | void css_driver_unregister(struct css_driver *cdrv) | |
1192 | { | |
1193 | driver_unregister(&cdrv->drv); | |
1194 | } | |
1195 | EXPORT_SYMBOL_GPL(css_driver_unregister); | |
1196 | ||
1da177e4 LT |
1197 | MODULE_LICENSE("GPL"); |
1198 | EXPORT_SYMBOL(css_bus_type); |