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; |
b0a285d3 | 35 | int max_ssid; |
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 | ||
1da177e4 LT |
154 | static void |
155 | css_subchannel_release(struct device *dev) | |
156 | { | |
157 | struct subchannel *sch; | |
158 | ||
159 | sch = to_subchannel(dev); | |
2ec22984 | 160 | if (!cio_is_console(sch->schid)) { |
1da73bc8 PO |
161 | /* Reset intparm to zeroes. */ |
162 | sch->config.intparm = 0; | |
163 | cio_commit_config(sch); | |
2ec22984 | 164 | kfree(sch->lock); |
1da177e4 | 165 | kfree(sch); |
2ec22984 | 166 | } |
1da177e4 LT |
167 | } |
168 | ||
07c6a338 | 169 | static int css_sch_device_register(struct subchannel *sch) |
6ab4879a CH |
170 | { |
171 | int ret; | |
172 | ||
173 | mutex_lock(&sch->reg_mutex); | |
6ee4fec6 SO |
174 | dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, |
175 | sch->schid.sch_no); | |
6ab4879a CH |
176 | ret = device_register(&sch->dev); |
177 | mutex_unlock(&sch->reg_mutex); | |
178 | return ret; | |
179 | } | |
180 | ||
44a1c19e CH |
181 | /** |
182 | * css_sch_device_unregister - unregister a subchannel | |
183 | * @sch: subchannel to be unregistered | |
184 | */ | |
6ab4879a CH |
185 | void css_sch_device_unregister(struct subchannel *sch) |
186 | { | |
187 | mutex_lock(&sch->reg_mutex); | |
ef60cd13 SO |
188 | if (device_is_registered(&sch->dev)) |
189 | device_unregister(&sch->dev); | |
6ab4879a CH |
190 | mutex_unlock(&sch->reg_mutex); |
191 | } | |
44a1c19e | 192 | EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
6ab4879a | 193 | |
7ad6a249 PO |
194 | static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) |
195 | { | |
196 | int i; | |
197 | int mask; | |
198 | ||
199 | memset(ssd, 0, sizeof(struct chsc_ssd_info)); | |
200 | ssd->path_mask = pmcw->pim; | |
201 | for (i = 0; i < 8; i++) { | |
202 | mask = 0x80 >> i; | |
203 | if (pmcw->pim & mask) { | |
204 | chp_id_init(&ssd->chpid[i]); | |
205 | ssd->chpid[i].id = pmcw->chpid[i]; | |
206 | } | |
207 | } | |
208 | } | |
209 | ||
210 | static void ssd_register_chpids(struct chsc_ssd_info *ssd) | |
211 | { | |
212 | int i; | |
213 | int mask; | |
214 | ||
215 | for (i = 0; i < 8; i++) { | |
216 | mask = 0x80 >> i; | |
217 | if (ssd->path_mask & mask) | |
218 | if (!chp_is_registered(ssd->chpid[i])) | |
219 | chp_new(ssd->chpid[i]); | |
220 | } | |
221 | } | |
222 | ||
223 | void css_update_ssd_info(struct subchannel *sch) | |
224 | { | |
225 | int ret; | |
226 | ||
227 | if (cio_is_console(sch->schid)) { | |
228 | /* Console is initialized too early for functions requiring | |
229 | * memory allocation. */ | |
230 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
231 | } else { | |
232 | ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); | |
233 | if (ret) | |
234 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
235 | ssd_register_chpids(&sch->ssd_info); | |
236 | } | |
237 | } | |
238 | ||
7e9db9ea CH |
239 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
240 | char *buf) | |
241 | { | |
242 | struct subchannel *sch = to_subchannel(dev); | |
243 | ||
244 | return sprintf(buf, "%01x\n", sch->st); | |
245 | } | |
246 | ||
247 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
248 | ||
249 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
250 | char *buf) | |
251 | { | |
252 | struct subchannel *sch = to_subchannel(dev); | |
253 | ||
254 | return sprintf(buf, "css:t%01X\n", sch->st); | |
255 | } | |
256 | ||
257 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); | |
258 | ||
259 | static struct attribute *subch_attrs[] = { | |
260 | &dev_attr_type.attr, | |
261 | &dev_attr_modalias.attr, | |
262 | NULL, | |
263 | }; | |
264 | ||
265 | static struct attribute_group subch_attr_group = { | |
266 | .attrs = subch_attrs, | |
267 | }; | |
268 | ||
a4dbd674 | 269 | static const struct attribute_group *default_subch_attr_groups[] = { |
7e9db9ea CH |
270 | &subch_attr_group, |
271 | NULL, | |
272 | }; | |
273 | ||
7ad6a249 | 274 | static int css_register_subchannel(struct subchannel *sch) |
1da177e4 LT |
275 | { |
276 | int ret; | |
277 | ||
278 | /* Initialize the subchannel structure */ | |
7c9f4e3a | 279 | sch->dev.parent = &channel_subsystems[0]->device; |
1da177e4 LT |
280 | sch->dev.bus = &css_bus_type; |
281 | sch->dev.release = &css_subchannel_release; | |
7e9db9ea | 282 | sch->dev.groups = default_subch_attr_groups; |
5bf04b20 CH |
283 | /* |
284 | * We don't want to generate uevents for I/O subchannels that don't | |
285 | * have a working ccw device behind them since they will be | |
286 | * unregistered before they can be used anyway, so we delay the add | |
287 | * uevent until after device recognition was successful. | |
7e9db9ea CH |
288 | * Note that we suppress the uevent for all subchannel types; |
289 | * the subchannel driver can decide itself when it wants to inform | |
290 | * userspace of its existence. | |
5bf04b20 | 291 | */ |
f67f129e | 292 | dev_set_uevent_suppress(&sch->dev, 1); |
7ad6a249 | 293 | css_update_ssd_info(sch); |
1da177e4 | 294 | /* make it known to the system */ |
6ab4879a | 295 | ret = css_sch_device_register(sch); |
7674da77 | 296 | if (ret) { |
e556bbbd CH |
297 | CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n", |
298 | sch->schid.ssid, sch->schid.sch_no, ret); | |
7674da77 CH |
299 | return ret; |
300 | } | |
7e9db9ea CH |
301 | if (!sch->driver) { |
302 | /* | |
303 | * No driver matched. Generate the uevent now so that | |
304 | * a fitting driver module may be loaded based on the | |
305 | * modalias. | |
306 | */ | |
f67f129e | 307 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea CH |
308 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
309 | } | |
1da177e4 LT |
310 | return ret; |
311 | } | |
312 | ||
c820de39 | 313 | int css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
314 | { |
315 | int ret; | |
316 | struct subchannel *sch; | |
317 | ||
a8237fc4 | 318 | sch = css_alloc_subchannel(schid); |
1da177e4 LT |
319 | if (IS_ERR(sch)) |
320 | return PTR_ERR(sch); | |
321 | ret = css_register_subchannel(sch); | |
322 | if (ret) | |
c6304933 | 323 | put_device(&sch->dev); |
1da177e4 LT |
324 | return ret; |
325 | } | |
326 | ||
b0744bd2 CH |
327 | static int |
328 | check_subchannel(struct device * dev, void * data) | |
329 | { | |
330 | struct subchannel *sch; | |
a8237fc4 | 331 | struct subchannel_id *schid = data; |
b0744bd2 CH |
332 | |
333 | sch = to_subchannel(dev); | |
a8237fc4 | 334 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
335 | } |
336 | ||
1da177e4 | 337 | struct subchannel * |
a8237fc4 | 338 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 339 | { |
1da177e4 LT |
340 | struct device *dev; |
341 | ||
b0744bd2 | 342 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 343 | &schid, check_subchannel); |
1da177e4 | 344 | |
b0744bd2 | 345 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
346 | } |
347 | ||
b279a4f5 CH |
348 | /** |
349 | * css_sch_is_valid() - check if a subchannel is valid | |
350 | * @schib: subchannel information block for the subchannel | |
351 | */ | |
352 | int css_sch_is_valid(struct schib *schib) | |
353 | { | |
354 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) | |
355 | return 0; | |
b3a686f4 CH |
356 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) |
357 | return 0; | |
b279a4f5 CH |
358 | return 1; |
359 | } | |
360 | EXPORT_SYMBOL_GPL(css_sch_is_valid); | |
361 | ||
564337f3 PO |
362 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) |
363 | { | |
364 | struct schib schib; | |
365 | ||
366 | if (!slow) { | |
367 | /* Will be done on the slow path. */ | |
368 | return -EAGAIN; | |
369 | } | |
b279a4f5 | 370 | if (stsch_err(schid, &schib) || !css_sch_is_valid(&schib)) { |
564337f3 PO |
371 | /* Unusable - ignore. */ |
372 | return 0; | |
1da177e4 | 373 | } |
564337f3 PO |
374 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, " |
375 | "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER); | |
376 | ||
377 | return css_probe_device(schid); | |
378 | } | |
379 | ||
c820de39 CH |
380 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) |
381 | { | |
382 | int ret = 0; | |
383 | ||
384 | if (sch->driver) { | |
385 | if (sch->driver->sch_event) | |
386 | ret = sch->driver->sch_event(sch, slow); | |
387 | else | |
388 | dev_dbg(&sch->dev, | |
389 | "Got subchannel machine check but " | |
390 | "no sch_event handler provided.\n"); | |
391 | } | |
392 | return ret; | |
393 | } | |
394 | ||
83b3370c | 395 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
396 | { |
397 | struct subchannel *sch; | |
398 | int ret; | |
399 | ||
400 | sch = get_subchannel_by_schid(schid); | |
401 | if (sch) { | |
402 | ret = css_evaluate_known_subchannel(sch, slow); | |
403 | put_device(&sch->dev); | |
404 | } else | |
405 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
406 | if (ret == -EAGAIN) |
407 | css_schedule_eval(schid); | |
1da177e4 LT |
408 | } |
409 | ||
83b3370c PO |
410 | static struct idset *slow_subchannel_set; |
411 | static spinlock_t slow_subchannel_lock; | |
25530553 SO |
412 | static wait_queue_head_t css_eval_wq; |
413 | static atomic_t css_eval_scheduled; | |
83b3370c PO |
414 | |
415 | static int __init slow_subchannel_init(void) | |
1da177e4 | 416 | { |
83b3370c | 417 | spin_lock_init(&slow_subchannel_lock); |
25530553 SO |
418 | atomic_set(&css_eval_scheduled, 0); |
419 | init_waitqueue_head(&css_eval_wq); | |
83b3370c PO |
420 | slow_subchannel_set = idset_sch_new(); |
421 | if (!slow_subchannel_set) { | |
e556bbbd | 422 | CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); |
83b3370c PO |
423 | return -ENOMEM; |
424 | } | |
425 | return 0; | |
1da177e4 LT |
426 | } |
427 | ||
e82a1567 | 428 | static int slow_eval_known_fn(struct subchannel *sch, void *data) |
1da177e4 | 429 | { |
e82a1567 PO |
430 | int eval; |
431 | int rc; | |
1da177e4 LT |
432 | |
433 | spin_lock_irq(&slow_subchannel_lock); | |
e82a1567 PO |
434 | eval = idset_sch_contains(slow_subchannel_set, sch->schid); |
435 | idset_sch_del(slow_subchannel_set, sch->schid); | |
436 | spin_unlock_irq(&slow_subchannel_lock); | |
437 | if (eval) { | |
438 | rc = css_evaluate_known_subchannel(sch, 1); | |
439 | if (rc == -EAGAIN) | |
440 | css_schedule_eval(sch->schid); | |
1da177e4 | 441 | } |
e82a1567 PO |
442 | return 0; |
443 | } | |
444 | ||
445 | static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) | |
446 | { | |
447 | int eval; | |
448 | int rc = 0; | |
449 | ||
450 | spin_lock_irq(&slow_subchannel_lock); | |
451 | eval = idset_sch_contains(slow_subchannel_set, schid); | |
452 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 453 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
454 | if (eval) { |
455 | rc = css_evaluate_new_subchannel(schid, 1); | |
456 | switch (rc) { | |
457 | case -EAGAIN: | |
458 | css_schedule_eval(schid); | |
459 | rc = 0; | |
460 | break; | |
461 | case -ENXIO: | |
462 | case -ENOMEM: | |
463 | case -EIO: | |
464 | /* These should abort looping */ | |
465 | break; | |
466 | default: | |
467 | rc = 0; | |
468 | } | |
469 | } | |
470 | return rc; | |
471 | } | |
472 | ||
473 | static void css_slow_path_func(struct work_struct *unused) | |
474 | { | |
25530553 SO |
475 | unsigned long flags; |
476 | ||
e82a1567 PO |
477 | CIO_TRACE_EVENT(4, "slowpath"); |
478 | for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, | |
479 | NULL); | |
25530553 SO |
480 | spin_lock_irqsave(&slow_subchannel_lock, flags); |
481 | if (idset_is_empty(slow_subchannel_set)) { | |
482 | atomic_set(&css_eval_scheduled, 0); | |
483 | wake_up(&css_eval_wq); | |
484 | } | |
485 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
1da177e4 LT |
486 | } |
487 | ||
83b3370c | 488 | static DECLARE_WORK(slow_path_work, css_slow_path_func); |
1da177e4 LT |
489 | struct workqueue_struct *slow_path_wq; |
490 | ||
83b3370c PO |
491 | void css_schedule_eval(struct subchannel_id schid) |
492 | { | |
493 | unsigned long flags; | |
494 | ||
495 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
496 | idset_sch_add(slow_subchannel_set, schid); | |
25530553 | 497 | atomic_set(&css_eval_scheduled, 1); |
83b3370c PO |
498 | queue_work(slow_path_wq, &slow_path_work); |
499 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
500 | } | |
501 | ||
502 | void css_schedule_eval_all(void) | |
503 | { | |
504 | unsigned long flags; | |
505 | ||
506 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
507 | idset_fill(slow_subchannel_set); | |
25530553 | 508 | atomic_set(&css_eval_scheduled, 1); |
83b3370c PO |
509 | queue_work(slow_path_wq, &slow_path_work); |
510 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
511 | } | |
512 | ||
22806dc1 CH |
513 | void css_wait_for_slow_path(void) |
514 | { | |
22806dc1 CH |
515 | flush_workqueue(slow_path_wq); |
516 | } | |
517 | ||
40154b82 PO |
518 | /* Reprobe subchannel if unregistered. */ |
519 | static int reprobe_subchannel(struct subchannel_id schid, void *data) | |
520 | { | |
40154b82 PO |
521 | int ret; |
522 | ||
e556bbbd CH |
523 | CIO_MSG_EVENT(6, "cio: reprobe 0.%x.%04x\n", |
524 | schid.ssid, schid.sch_no); | |
40154b82 PO |
525 | if (need_reprobe) |
526 | return -EAGAIN; | |
527 | ||
40154b82 PO |
528 | ret = css_probe_device(schid); |
529 | switch (ret) { | |
530 | case 0: | |
531 | break; | |
532 | case -ENXIO: | |
533 | case -ENOMEM: | |
67175616 | 534 | case -EIO: |
40154b82 PO |
535 | /* These should abort looping */ |
536 | break; | |
537 | default: | |
538 | ret = 0; | |
539 | } | |
540 | ||
541 | return ret; | |
542 | } | |
543 | ||
56e25e97 PO |
544 | static void reprobe_after_idle(struct work_struct *unused) |
545 | { | |
546 | /* Make sure initial subchannel scan is done. */ | |
547 | wait_event(ccw_device_init_wq, | |
548 | atomic_read(&ccw_device_init_count) == 0); | |
549 | if (need_reprobe) | |
550 | css_schedule_reprobe(); | |
551 | } | |
552 | ||
553 | static DECLARE_WORK(reprobe_idle_work, reprobe_after_idle); | |
554 | ||
40154b82 | 555 | /* Work function used to reprobe all unregistered subchannels. */ |
4927b3f7 | 556 | static void reprobe_all(struct work_struct *unused) |
40154b82 PO |
557 | { |
558 | int ret; | |
559 | ||
139b83dd | 560 | CIO_MSG_EVENT(4, "reprobe start\n"); |
40154b82 | 561 | |
40154b82 | 562 | /* Make sure initial subchannel scan is done. */ |
56e25e97 PO |
563 | if (atomic_read(&ccw_device_init_count) != 0) { |
564 | queue_work(ccw_device_work, &reprobe_idle_work); | |
565 | return; | |
566 | } | |
567 | need_reprobe = 0; | |
e82a1567 | 568 | ret = for_each_subchannel_staged(NULL, reprobe_subchannel, NULL); |
40154b82 | 569 | |
139b83dd | 570 | CIO_MSG_EVENT(4, "reprobe done (rc=%d, need_reprobe=%d)\n", ret, |
40154b82 PO |
571 | need_reprobe); |
572 | } | |
573 | ||
2b67fc46 | 574 | static DECLARE_WORK(css_reprobe_work, reprobe_all); |
40154b82 PO |
575 | |
576 | /* Schedule reprobing of all unregistered subchannels. */ | |
577 | void css_schedule_reprobe(void) | |
578 | { | |
579 | need_reprobe = 1; | |
c5d4a999 | 580 | queue_work(slow_path_wq, &css_reprobe_work); |
40154b82 PO |
581 | } |
582 | ||
583 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); | |
584 | ||
1da177e4 LT |
585 | /* |
586 | * Called from the machine check handler for subchannel report words. | |
587 | */ | |
c1156189 | 588 | static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
1da177e4 | 589 | { |
a8237fc4 | 590 | struct subchannel_id mchk_schid; |
1da177e4 | 591 | |
c1156189 CH |
592 | if (overflow) { |
593 | css_schedule_eval_all(); | |
594 | return; | |
595 | } | |
596 | CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " | |
597 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
598 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
599 | crw0->erc, crw0->rsid); | |
600 | if (crw1) | |
601 | CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " | |
602 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
603 | crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, | |
604 | crw1->anc, crw1->erc, crw1->rsid); | |
a8237fc4 | 605 | init_subchannel_id(&mchk_schid); |
c1156189 CH |
606 | mchk_schid.sch_no = crw0->rsid; |
607 | if (crw1) | |
608 | mchk_schid.ssid = (crw1->rsid >> 8) & 3; | |
fb6958a5 | 609 | |
c1156189 | 610 | /* |
1da177e4 LT |
611 | * Since we are always presented with IPI in the CRW, we have to |
612 | * use stsch() to find out if the subchannel in question has come | |
613 | * or gone. | |
614 | */ | |
83b3370c | 615 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
616 | } |
617 | ||
2f17644d | 618 | static int __init setup_subchannel(struct subchannel_id schid, void *data) |
f97a56fb CH |
619 | { |
620 | struct subchannel *sch; | |
621 | int ret; | |
622 | ||
623 | if (cio_is_console(schid)) | |
624 | sch = cio_get_console_subchannel(); | |
625 | else { | |
626 | sch = css_alloc_subchannel(schid); | |
627 | if (IS_ERR(sch)) | |
628 | ret = PTR_ERR(sch); | |
629 | else | |
630 | ret = 0; | |
631 | switch (ret) { | |
632 | case 0: | |
633 | break; | |
634 | case -ENOMEM: | |
635 | panic("Out of memory in init_channel_subsystem\n"); | |
636 | /* -ENXIO: no more subchannels. */ | |
637 | case -ENXIO: | |
638 | return ret; | |
e843e280 GS |
639 | /* -EIO: this subchannel set not supported. */ |
640 | case -EIO: | |
641 | return ret; | |
f97a56fb CH |
642 | default: |
643 | return 0; | |
644 | } | |
645 | } | |
646 | /* | |
647 | * We register ALL valid subchannels in ioinfo, even those | |
648 | * that have been present before init_channel_subsystem. | |
649 | * These subchannels can't have been registered yet (kmalloc | |
650 | * not working) so we do it now. This is true e.g. for the | |
651 | * console subchannel. | |
652 | */ | |
c6304933 SO |
653 | if (css_register_subchannel(sch)) { |
654 | if (!cio_is_console(schid)) | |
655 | put_device(&sch->dev); | |
656 | } | |
f97a56fb CH |
657 | return 0; |
658 | } | |
659 | ||
1da177e4 | 660 | static void __init |
a28c6944 | 661 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 662 | { |
75784c00 | 663 | if (css_general_characteristics.mcss) { |
a28c6944 CH |
664 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
665 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
666 | } else { | |
1da177e4 | 667 | #ifdef CONFIG_SMP |
7b468488 | 668 | css->global_pgid.pgid_high.cpu_addr = stap(); |
1da177e4 | 669 | #else |
a28c6944 | 670 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
671 | #endif |
672 | } | |
e86a6ed6 HC |
673 | css->global_pgid.cpu_id = S390_lowcore.cpu_id.ident; |
674 | css->global_pgid.cpu_model = S390_lowcore.cpu_id.machine; | |
a28c6944 CH |
675 | css->global_pgid.tod_high = tod_high; |
676 | ||
677 | } | |
678 | ||
3b793060 CH |
679 | static void |
680 | channel_subsystem_release(struct device *dev) | |
681 | { | |
682 | struct channel_subsystem *css; | |
683 | ||
684 | css = to_css(dev); | |
495a5b45 | 685 | mutex_destroy(&css->mutex); |
a2164b81 CH |
686 | if (css->pseudo_subchannel) { |
687 | /* Implies that it has been generated but never registered. */ | |
688 | css_subchannel_release(&css->pseudo_subchannel->dev); | |
689 | css->pseudo_subchannel = NULL; | |
690 | } | |
3b793060 CH |
691 | kfree(css); |
692 | } | |
693 | ||
495a5b45 CH |
694 | static ssize_t |
695 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
696 | char *buf) | |
697 | { | |
698 | struct channel_subsystem *css = to_css(dev); | |
8284fb19 | 699 | int ret; |
495a5b45 CH |
700 | |
701 | if (!css) | |
702 | return 0; | |
8284fb19 ME |
703 | mutex_lock(&css->mutex); |
704 | ret = sprintf(buf, "%x\n", css->cm_enabled); | |
705 | mutex_unlock(&css->mutex); | |
706 | return ret; | |
495a5b45 CH |
707 | } |
708 | ||
709 | static ssize_t | |
710 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
711 | const char *buf, size_t count) | |
712 | { | |
713 | struct channel_subsystem *css = to_css(dev); | |
714 | int ret; | |
2f972202 | 715 | unsigned long val; |
495a5b45 | 716 | |
2f972202 CH |
717 | ret = strict_strtoul(buf, 16, &val); |
718 | if (ret) | |
719 | return ret; | |
8284fb19 | 720 | mutex_lock(&css->mutex); |
2f972202 CH |
721 | switch (val) { |
722 | case 0: | |
495a5b45 CH |
723 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; |
724 | break; | |
2f972202 | 725 | case 1: |
495a5b45 CH |
726 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); |
727 | break; | |
728 | default: | |
729 | ret = -EINVAL; | |
730 | } | |
8284fb19 | 731 | mutex_unlock(&css->mutex); |
495a5b45 CH |
732 | return ret < 0 ? ret : count; |
733 | } | |
734 | ||
735 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
736 | ||
4d284cac | 737 | static int __init setup_css(int nr) |
a28c6944 CH |
738 | { |
739 | u32 tod_high; | |
d7b5a4c9 | 740 | int ret; |
7c9f4e3a | 741 | struct channel_subsystem *css; |
a28c6944 | 742 | |
7c9f4e3a CH |
743 | css = channel_subsystems[nr]; |
744 | memset(css, 0, sizeof(struct channel_subsystem)); | |
745 | css->pseudo_subchannel = | |
746 | kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL); | |
747 | if (!css->pseudo_subchannel) | |
d7b5a4c9 | 748 | return -ENOMEM; |
7c9f4e3a CH |
749 | css->pseudo_subchannel->dev.parent = &css->device; |
750 | css->pseudo_subchannel->dev.release = css_subchannel_release; | |
1bf5b285 | 751 | dev_set_name(&css->pseudo_subchannel->dev, "defunct"); |
7c9f4e3a | 752 | ret = cio_create_sch_lock(css->pseudo_subchannel); |
d7b5a4c9 | 753 | if (ret) { |
7c9f4e3a | 754 | kfree(css->pseudo_subchannel); |
d7b5a4c9 CH |
755 | return ret; |
756 | } | |
7c9f4e3a CH |
757 | mutex_init(&css->mutex); |
758 | css->valid = 1; | |
759 | css->cssid = nr; | |
1bf5b285 | 760 | dev_set_name(&css->device, "css%x", nr); |
7c9f4e3a | 761 | css->device.release = channel_subsystem_release; |
a28c6944 | 762 | tod_high = (u32) (get_clock() >> 32); |
7c9f4e3a | 763 | css_generate_pgid(css, tod_high); |
d7b5a4c9 | 764 | return 0; |
1da177e4 LT |
765 | } |
766 | ||
a55360df CH |
767 | static int css_reboot_event(struct notifier_block *this, |
768 | unsigned long event, | |
769 | void *ptr) | |
770 | { | |
771 | int ret, i; | |
772 | ||
773 | ret = NOTIFY_DONE; | |
774 | for (i = 0; i <= __MAX_CSSID; i++) { | |
775 | struct channel_subsystem *css; | |
776 | ||
777 | css = channel_subsystems[i]; | |
8284fb19 | 778 | mutex_lock(&css->mutex); |
a55360df CH |
779 | if (css->cm_enabled) |
780 | if (chsc_secm(css, 0)) | |
781 | ret = NOTIFY_BAD; | |
8284fb19 | 782 | mutex_unlock(&css->mutex); |
a55360df CH |
783 | } |
784 | ||
785 | return ret; | |
786 | } | |
787 | ||
788 | static struct notifier_block css_reboot_notifier = { | |
789 | .notifier_call = css_reboot_event, | |
790 | }; | |
791 | ||
dcbd16d5 SO |
792 | /* |
793 | * Since the css devices are neither on a bus nor have a class | |
794 | * nor have a special device type, we cannot stop/restart channel | |
795 | * path measurements via the normal suspend/resume callbacks, but have | |
796 | * to use notifiers. | |
797 | */ | |
798 | static int css_power_event(struct notifier_block *this, unsigned long event, | |
799 | void *ptr) | |
800 | { | |
801 | void *secm_area; | |
802 | int ret, i; | |
803 | ||
804 | switch (event) { | |
805 | case PM_HIBERNATION_PREPARE: | |
806 | case PM_SUSPEND_PREPARE: | |
807 | ret = NOTIFY_DONE; | |
808 | for (i = 0; i <= __MAX_CSSID; i++) { | |
809 | struct channel_subsystem *css; | |
810 | ||
811 | css = channel_subsystems[i]; | |
812 | mutex_lock(&css->mutex); | |
813 | if (!css->cm_enabled) { | |
814 | mutex_unlock(&css->mutex); | |
815 | continue; | |
816 | } | |
817 | secm_area = (void *)get_zeroed_page(GFP_KERNEL | | |
818 | GFP_DMA); | |
819 | if (secm_area) { | |
820 | if (__chsc_do_secm(css, 0, secm_area)) | |
821 | ret = NOTIFY_BAD; | |
822 | free_page((unsigned long)secm_area); | |
823 | } else | |
824 | ret = NOTIFY_BAD; | |
825 | ||
826 | mutex_unlock(&css->mutex); | |
827 | } | |
828 | break; | |
829 | case PM_POST_HIBERNATION: | |
830 | case PM_POST_SUSPEND: | |
831 | ret = NOTIFY_DONE; | |
832 | for (i = 0; i <= __MAX_CSSID; i++) { | |
833 | struct channel_subsystem *css; | |
834 | ||
835 | css = channel_subsystems[i]; | |
836 | mutex_lock(&css->mutex); | |
837 | if (!css->cm_enabled) { | |
838 | mutex_unlock(&css->mutex); | |
839 | continue; | |
840 | } | |
841 | secm_area = (void *)get_zeroed_page(GFP_KERNEL | | |
842 | GFP_DMA); | |
843 | if (secm_area) { | |
844 | if (__chsc_do_secm(css, 1, secm_area)) | |
845 | ret = NOTIFY_BAD; | |
846 | free_page((unsigned long)secm_area); | |
847 | } else | |
848 | ret = NOTIFY_BAD; | |
849 | ||
850 | mutex_unlock(&css->mutex); | |
851 | } | |
852 | /* search for subchannels, which appeared during hibernation */ | |
853 | css_schedule_reprobe(); | |
854 | break; | |
855 | default: | |
856 | ret = NOTIFY_DONE; | |
857 | } | |
858 | return ret; | |
859 | ||
860 | } | |
861 | static struct notifier_block css_power_notifier = { | |
862 | .notifier_call = css_power_event, | |
863 | }; | |
864 | ||
1da177e4 LT |
865 | /* |
866 | * Now that the driver core is running, we can setup our channel subsystem. | |
867 | * The struct subchannel's are created during probing (except for the | |
868 | * static console subchannel). | |
869 | */ | |
2f17644d | 870 | static int __init css_bus_init(void) |
1da177e4 | 871 | { |
a28c6944 | 872 | int ret, i; |
1da177e4 | 873 | |
4434a38c CH |
874 | ret = chsc_determine_css_characteristics(); |
875 | if (ret == -ENOMEM) | |
2f17644d | 876 | goto out; |
1da177e4 | 877 | |
4434a38c CH |
878 | ret = chsc_alloc_sei_area(); |
879 | if (ret) | |
880 | goto out; | |
881 | ||
b0a285d3 SO |
882 | /* Try to enable MSS. */ |
883 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
884 | switch (ret) { | |
885 | case 0: /* Success. */ | |
886 | max_ssid = __MAX_SSID; | |
887 | break; | |
888 | case -ENOMEM: | |
889 | goto out; | |
890 | default: | |
891 | max_ssid = 0; | |
892 | } | |
893 | ||
4434a38c CH |
894 | ret = slow_subchannel_init(); |
895 | if (ret) | |
896 | goto out; | |
897 | ||
f5daba1d | 898 | ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); |
c1156189 CH |
899 | if (ret) |
900 | goto out; | |
901 | ||
1da177e4 LT |
902 | if ((ret = bus_register(&css_bus_type))) |
903 | goto out; | |
1da177e4 | 904 | |
a28c6944 CH |
905 | /* Setup css structure. */ |
906 | for (i = 0; i <= __MAX_CSSID; i++) { | |
7c9f4e3a CH |
907 | struct channel_subsystem *css; |
908 | ||
909 | css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
910 | if (!css) { | |
a28c6944 | 911 | ret = -ENOMEM; |
fb6958a5 | 912 | goto out_unregister; |
a28c6944 | 913 | } |
7c9f4e3a | 914 | channel_subsystems[i] = css; |
d7b5a4c9 | 915 | ret = setup_css(i); |
a2164b81 CH |
916 | if (ret) { |
917 | kfree(channel_subsystems[i]); | |
918 | goto out_unregister; | |
919 | } | |
7c9f4e3a | 920 | ret = device_register(&css->device); |
a2164b81 CH |
921 | if (ret) { |
922 | put_device(&css->device); | |
923 | goto out_unregister; | |
924 | } | |
75784c00 | 925 | if (css_chsc_characteristics.secm) { |
7c9f4e3a | 926 | ret = device_create_file(&css->device, |
7e560814 CH |
927 | &dev_attr_cm_enable); |
928 | if (ret) | |
929 | goto out_device; | |
930 | } | |
7c9f4e3a | 931 | ret = device_register(&css->pseudo_subchannel->dev); |
c6304933 SO |
932 | if (ret) { |
933 | put_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 | 934 | goto out_file; |
c6304933 | 935 | } |
a28c6944 | 936 | } |
a55360df CH |
937 | ret = register_reboot_notifier(&css_reboot_notifier); |
938 | if (ret) | |
a2164b81 | 939 | goto out_unregister; |
dcbd16d5 SO |
940 | ret = register_pm_notifier(&css_power_notifier); |
941 | if (ret) { | |
942 | unregister_reboot_notifier(&css_reboot_notifier); | |
943 | goto out_unregister; | |
944 | } | |
1da177e4 LT |
945 | css_init_done = 1; |
946 | ||
3a3fc29a | 947 | /* Enable default isc for I/O subchannels. */ |
6ef556cc | 948 | isc_register(IO_SCH_ISC); |
1da177e4 | 949 | |
1da177e4 | 950 | return 0; |
d7b5a4c9 | 951 | out_file: |
a2164b81 CH |
952 | if (css_chsc_characteristics.secm) |
953 | device_remove_file(&channel_subsystems[i]->device, | |
954 | &dev_attr_cm_enable); | |
7e560814 | 955 | out_device: |
7c9f4e3a | 956 | device_unregister(&channel_subsystems[i]->device); |
fb6958a5 | 957 | out_unregister: |
a28c6944 | 958 | while (i > 0) { |
7c9f4e3a CH |
959 | struct channel_subsystem *css; |
960 | ||
a28c6944 | 961 | i--; |
7c9f4e3a CH |
962 | css = channel_subsystems[i]; |
963 | device_unregister(&css->pseudo_subchannel->dev); | |
a2164b81 | 964 | css->pseudo_subchannel = NULL; |
75784c00 | 965 | if (css_chsc_characteristics.secm) |
7c9f4e3a | 966 | device_remove_file(&css->device, |
495a5b45 | 967 | &dev_attr_cm_enable); |
7c9f4e3a | 968 | device_unregister(&css->device); |
a28c6944 | 969 | } |
1da177e4 LT |
970 | bus_unregister(&css_bus_type); |
971 | out: | |
f5daba1d | 972 | crw_unregister_handler(CRW_RSC_CSS); |
4434a38c | 973 | chsc_free_sei_area(); |
b827d1c8 | 974 | idset_free(slow_subchannel_set); |
e6d5a428 ME |
975 | pr_alert("The CSS device driver initialization failed with " |
976 | "errno=%d\n", ret); | |
1da177e4 LT |
977 | return ret; |
978 | } | |
979 | ||
2f17644d SO |
980 | static void __init css_bus_cleanup(void) |
981 | { | |
982 | struct channel_subsystem *css; | |
983 | int i; | |
984 | ||
985 | for (i = 0; i <= __MAX_CSSID; i++) { | |
986 | css = channel_subsystems[i]; | |
987 | device_unregister(&css->pseudo_subchannel->dev); | |
988 | css->pseudo_subchannel = NULL; | |
989 | if (css_chsc_characteristics.secm) | |
990 | device_remove_file(&css->device, &dev_attr_cm_enable); | |
991 | device_unregister(&css->device); | |
992 | } | |
993 | bus_unregister(&css_bus_type); | |
994 | crw_unregister_handler(CRW_RSC_CSS); | |
995 | chsc_free_sei_area(); | |
b827d1c8 | 996 | idset_free(slow_subchannel_set); |
2f17644d SO |
997 | isc_unregister(IO_SCH_ISC); |
998 | } | |
999 | ||
1000 | static int __init channel_subsystem_init(void) | |
1001 | { | |
1002 | int ret; | |
1003 | ||
1004 | ret = css_bus_init(); | |
1005 | if (ret) | |
1006 | return ret; | |
1007 | ||
1008 | ret = io_subchannel_init(); | |
1009 | if (ret) | |
1010 | css_bus_cleanup(); | |
1011 | ||
1012 | return ret; | |
1013 | } | |
1014 | subsys_initcall(channel_subsystem_init); | |
1015 | ||
8ea7f559 SO |
1016 | static int css_settle(struct device_driver *drv, void *unused) |
1017 | { | |
1018 | struct css_driver *cssdrv = to_cssdriver(drv); | |
1019 | ||
1020 | if (cssdrv->settle) | |
1021 | cssdrv->settle(); | |
1022 | return 0; | |
1023 | } | |
1024 | ||
2f17644d SO |
1025 | /* |
1026 | * Wait for the initialization of devices to finish, to make sure we are | |
1027 | * done with our setup if the search for the root device starts. | |
1028 | */ | |
1029 | static int __init channel_subsystem_init_sync(void) | |
1030 | { | |
1031 | /* Allocate and register subchannels. */ | |
1032 | for_each_subchannel(setup_subchannel, NULL); | |
25530553 SO |
1033 | /* Wait for the evaluation of subchannels to finish. */ |
1034 | wait_event(css_eval_wq, atomic_read(&css_eval_scheduled) == 0); | |
2f17644d | 1035 | |
8ea7f559 SO |
1036 | /* Wait for the subchannel type specific initialization to finish */ |
1037 | return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle); | |
2f17644d SO |
1038 | } |
1039 | subsys_initcall_sync(channel_subsystem_init_sync); | |
1040 | ||
d7b5a4c9 CH |
1041 | int sch_is_pseudo_sch(struct subchannel *sch) |
1042 | { | |
1043 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
1044 | } | |
1045 | ||
f08adc00 | 1046 | static int css_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1047 | { |
084325d8 CH |
1048 | struct subchannel *sch = to_subchannel(dev); |
1049 | struct css_driver *driver = to_cssdriver(drv); | |
f08adc00 | 1050 | struct css_device_id *id; |
1da177e4 | 1051 | |
f08adc00 CH |
1052 | for (id = driver->subchannel_type; id->match_flags; id++) { |
1053 | if (sch->st == id->type) | |
1054 | return 1; | |
1055 | } | |
1da177e4 LT |
1056 | |
1057 | return 0; | |
1058 | } | |
1059 | ||
98c13c28 | 1060 | static int css_probe(struct device *dev) |
8bbace7e CH |
1061 | { |
1062 | struct subchannel *sch; | |
98c13c28 | 1063 | int ret; |
8bbace7e CH |
1064 | |
1065 | sch = to_subchannel(dev); | |
084325d8 | 1066 | sch->driver = to_cssdriver(dev->driver); |
98c13c28 CH |
1067 | ret = sch->driver->probe ? sch->driver->probe(sch) : 0; |
1068 | if (ret) | |
1069 | sch->driver = NULL; | |
1070 | return ret; | |
8bbace7e CH |
1071 | } |
1072 | ||
98c13c28 | 1073 | static int css_remove(struct device *dev) |
8bbace7e CH |
1074 | { |
1075 | struct subchannel *sch; | |
98c13c28 | 1076 | int ret; |
8bbace7e CH |
1077 | |
1078 | sch = to_subchannel(dev); | |
98c13c28 CH |
1079 | ret = sch->driver->remove ? sch->driver->remove(sch) : 0; |
1080 | sch->driver = NULL; | |
1081 | return ret; | |
8bbace7e CH |
1082 | } |
1083 | ||
98c13c28 | 1084 | static void css_shutdown(struct device *dev) |
8bbace7e CH |
1085 | { |
1086 | struct subchannel *sch; | |
1087 | ||
1088 | sch = to_subchannel(dev); | |
98c13c28 | 1089 | if (sch->driver && sch->driver->shutdown) |
8bbace7e CH |
1090 | sch->driver->shutdown(sch); |
1091 | } | |
1092 | ||
7e9db9ea CH |
1093 | static int css_uevent(struct device *dev, struct kobj_uevent_env *env) |
1094 | { | |
1095 | struct subchannel *sch = to_subchannel(dev); | |
1096 | int ret; | |
1097 | ||
1098 | ret = add_uevent_var(env, "ST=%01X", sch->st); | |
1099 | if (ret) | |
1100 | return ret; | |
1101 | ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); | |
1102 | return ret; | |
1103 | } | |
1104 | ||
dcbd16d5 SO |
1105 | static int css_pm_prepare(struct device *dev) |
1106 | { | |
1107 | struct subchannel *sch = to_subchannel(dev); | |
1108 | struct css_driver *drv; | |
1109 | ||
1110 | if (mutex_is_locked(&sch->reg_mutex)) | |
1111 | return -EAGAIN; | |
1112 | if (!sch->dev.driver) | |
1113 | return 0; | |
1114 | drv = to_cssdriver(sch->dev.driver); | |
1115 | /* Notify drivers that they may not register children. */ | |
1116 | return drv->prepare ? drv->prepare(sch) : 0; | |
1117 | } | |
1118 | ||
1119 | static void css_pm_complete(struct device *dev) | |
1120 | { | |
1121 | struct subchannel *sch = to_subchannel(dev); | |
1122 | struct css_driver *drv; | |
1123 | ||
1124 | if (!sch->dev.driver) | |
1125 | return; | |
1126 | drv = to_cssdriver(sch->dev.driver); | |
1127 | if (drv->complete) | |
1128 | drv->complete(sch); | |
1129 | } | |
1130 | ||
1131 | static int css_pm_freeze(struct device *dev) | |
1132 | { | |
1133 | struct subchannel *sch = to_subchannel(dev); | |
1134 | struct css_driver *drv; | |
1135 | ||
1136 | if (!sch->dev.driver) | |
1137 | return 0; | |
1138 | drv = to_cssdriver(sch->dev.driver); | |
1139 | return drv->freeze ? drv->freeze(sch) : 0; | |
1140 | } | |
1141 | ||
1142 | static int css_pm_thaw(struct device *dev) | |
1143 | { | |
1144 | struct subchannel *sch = to_subchannel(dev); | |
1145 | struct css_driver *drv; | |
1146 | ||
1147 | if (!sch->dev.driver) | |
1148 | return 0; | |
1149 | drv = to_cssdriver(sch->dev.driver); | |
1150 | return drv->thaw ? drv->thaw(sch) : 0; | |
1151 | } | |
1152 | ||
1153 | static int css_pm_restore(struct device *dev) | |
1154 | { | |
1155 | struct subchannel *sch = to_subchannel(dev); | |
1156 | struct css_driver *drv; | |
1157 | ||
1158 | if (!sch->dev.driver) | |
1159 | return 0; | |
1160 | drv = to_cssdriver(sch->dev.driver); | |
1161 | return drv->restore ? drv->restore(sch) : 0; | |
1162 | } | |
1163 | ||
1164 | static struct dev_pm_ops css_pm_ops = { | |
1165 | .prepare = css_pm_prepare, | |
1166 | .complete = css_pm_complete, | |
1167 | .freeze = css_pm_freeze, | |
1168 | .thaw = css_pm_thaw, | |
1169 | .restore = css_pm_restore, | |
1170 | }; | |
1171 | ||
1da177e4 | 1172 | struct bus_type css_bus_type = { |
8bbace7e CH |
1173 | .name = "css", |
1174 | .match = css_bus_match, | |
1175 | .probe = css_probe, | |
1176 | .remove = css_remove, | |
1177 | .shutdown = css_shutdown, | |
7e9db9ea | 1178 | .uevent = css_uevent, |
dcbd16d5 | 1179 | .pm = &css_pm_ops, |
1da177e4 LT |
1180 | }; |
1181 | ||
25b7bb58 CH |
1182 | /** |
1183 | * css_driver_register - register a css driver | |
1184 | * @cdrv: css driver to register | |
1185 | * | |
1186 | * This is mainly a wrapper around driver_register that sets name | |
1187 | * and bus_type in the embedded struct device_driver correctly. | |
1188 | */ | |
1189 | int css_driver_register(struct css_driver *cdrv) | |
1190 | { | |
1191 | cdrv->drv.name = cdrv->name; | |
1192 | cdrv->drv.bus = &css_bus_type; | |
4beee646 | 1193 | cdrv->drv.owner = cdrv->owner; |
25b7bb58 CH |
1194 | return driver_register(&cdrv->drv); |
1195 | } | |
1196 | EXPORT_SYMBOL_GPL(css_driver_register); | |
1197 | ||
1198 | /** | |
1199 | * css_driver_unregister - unregister a css driver | |
1200 | * @cdrv: css driver to unregister | |
1201 | * | |
1202 | * This is a wrapper around driver_unregister. | |
1203 | */ | |
1204 | void css_driver_unregister(struct css_driver *cdrv) | |
1205 | { | |
1206 | driver_unregister(&cdrv->drv); | |
1207 | } | |
1208 | EXPORT_SYMBOL_GPL(css_driver_unregister); | |
1209 | ||
1da177e4 LT |
1210 | MODULE_LICENSE("GPL"); |
1211 | EXPORT_SYMBOL(css_bus_type); |