Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/css.c | |
3 | * driver for channel subsystem | |
1da177e4 | 4 | * |
7e9db9ea | 5 | * Copyright IBM Corp. 2002,2008 |
1da177e4 | 6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
4ce3b30c | 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
8 | */ |
9 | #include <linux/module.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/list.h> | |
a55360df | 15 | #include <linux/reboot.h> |
3a3fc29a | 16 | #include <asm/isc.h> |
1da177e4 | 17 | |
c1156189 | 18 | #include "../s390mach.h" |
1da177e4 LT |
19 | #include "css.h" |
20 | #include "cio.h" | |
21 | #include "cio_debug.h" | |
22 | #include "ioasm.h" | |
23 | #include "chsc.h" | |
40154b82 | 24 | #include "device.h" |
83b3370c | 25 | #include "idset.h" |
7ad6a249 | 26 | #include "chp.h" |
1da177e4 | 27 | |
1da177e4 | 28 | int css_init_done = 0; |
40154b82 | 29 | static int need_reprobe = 0; |
fb6958a5 | 30 | static int max_ssid = 0; |
1da177e4 | 31 | |
7c9f4e3a | 32 | struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1]; |
1da177e4 | 33 | |
4d284cac | 34 | int |
f97a56fb CH |
35 | for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) |
36 | { | |
37 | struct subchannel_id schid; | |
38 | int ret; | |
39 | ||
40 | init_subchannel_id(&schid); | |
41 | ret = -ENODEV; | |
42 | do { | |
fb6958a5 CH |
43 | do { |
44 | ret = fn(schid, data); | |
45 | if (ret) | |
46 | break; | |
47 | } while (schid.sch_no++ < __MAX_SUBCHANNEL); | |
48 | schid.sch_no = 0; | |
49 | } while (schid.ssid++ < max_ssid); | |
f97a56fb CH |
50 | return ret; |
51 | } | |
52 | ||
e82a1567 PO |
53 | struct cb_data { |
54 | void *data; | |
55 | struct idset *set; | |
56 | int (*fn_known_sch)(struct subchannel *, void *); | |
57 | int (*fn_unknown_sch)(struct subchannel_id, void *); | |
58 | }; | |
59 | ||
60 | static int call_fn_known_sch(struct device *dev, void *data) | |
61 | { | |
62 | struct subchannel *sch = to_subchannel(dev); | |
63 | struct cb_data *cb = data; | |
64 | int rc = 0; | |
65 | ||
66 | idset_sch_del(cb->set, sch->schid); | |
67 | if (cb->fn_known_sch) | |
68 | rc = cb->fn_known_sch(sch, cb->data); | |
69 | return rc; | |
70 | } | |
71 | ||
72 | static int call_fn_unknown_sch(struct subchannel_id schid, void *data) | |
73 | { | |
74 | struct cb_data *cb = data; | |
75 | int rc = 0; | |
76 | ||
77 | if (idset_sch_contains(cb->set, schid)) | |
78 | rc = cb->fn_unknown_sch(schid, cb->data); | |
79 | return rc; | |
80 | } | |
81 | ||
82 | int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), | |
83 | int (*fn_unknown)(struct subchannel_id, | |
84 | void *), void *data) | |
85 | { | |
86 | struct cb_data cb; | |
87 | int rc; | |
88 | ||
89 | cb.set = idset_sch_new(); | |
90 | if (!cb.set) | |
91 | return -ENOMEM; | |
92 | idset_fill(cb.set); | |
93 | cb.data = data; | |
94 | cb.fn_known_sch = fn_known; | |
95 | cb.fn_unknown_sch = fn_unknown; | |
96 | /* Process registered subchannels. */ | |
97 | rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); | |
98 | if (rc) | |
99 | goto out; | |
100 | /* Process unregistered subchannels. */ | |
101 | if (fn_unknown) | |
102 | rc = for_each_subchannel(call_fn_unknown_sch, &cb); | |
103 | out: | |
104 | idset_free(cb.set); | |
105 | ||
106 | return rc; | |
107 | } | |
108 | ||
1da177e4 | 109 | static struct subchannel * |
a8237fc4 | 110 | css_alloc_subchannel(struct subchannel_id schid) |
1da177e4 LT |
111 | { |
112 | struct subchannel *sch; | |
113 | int ret; | |
114 | ||
115 | sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA); | |
116 | if (sch == NULL) | |
117 | return ERR_PTR(-ENOMEM); | |
a8237fc4 | 118 | ret = cio_validate_subchannel (sch, schid); |
1da177e4 LT |
119 | if (ret < 0) { |
120 | kfree(sch); | |
121 | return ERR_PTR(ret); | |
122 | } | |
1da177e4 LT |
123 | return sch; |
124 | } | |
125 | ||
126 | static void | |
127 | css_free_subchannel(struct subchannel *sch) | |
128 | { | |
129 | if (sch) { | |
130 | /* Reset intparm to zeroes. */ | |
131 | sch->schib.pmcw.intparm = 0; | |
132 | cio_modify(sch); | |
2ec22984 | 133 | kfree(sch->lock); |
1da177e4 LT |
134 | kfree(sch); |
135 | } | |
1da177e4 LT |
136 | } |
137 | ||
138 | static void | |
139 | css_subchannel_release(struct device *dev) | |
140 | { | |
141 | struct subchannel *sch; | |
142 | ||
143 | sch = to_subchannel(dev); | |
2ec22984 CH |
144 | if (!cio_is_console(sch->schid)) { |
145 | kfree(sch->lock); | |
1da177e4 | 146 | kfree(sch); |
2ec22984 | 147 | } |
1da177e4 LT |
148 | } |
149 | ||
07c6a338 | 150 | static int css_sch_device_register(struct subchannel *sch) |
6ab4879a CH |
151 | { |
152 | int ret; | |
153 | ||
154 | mutex_lock(&sch->reg_mutex); | |
155 | ret = device_register(&sch->dev); | |
156 | mutex_unlock(&sch->reg_mutex); | |
157 | return ret; | |
158 | } | |
159 | ||
44a1c19e CH |
160 | /** |
161 | * css_sch_device_unregister - unregister a subchannel | |
162 | * @sch: subchannel to be unregistered | |
163 | */ | |
6ab4879a CH |
164 | void css_sch_device_unregister(struct subchannel *sch) |
165 | { | |
166 | mutex_lock(&sch->reg_mutex); | |
167 | device_unregister(&sch->dev); | |
168 | mutex_unlock(&sch->reg_mutex); | |
169 | } | |
44a1c19e | 170 | EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
6ab4879a | 171 | |
7ad6a249 PO |
172 | static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) |
173 | { | |
174 | int i; | |
175 | int mask; | |
176 | ||
177 | memset(ssd, 0, sizeof(struct chsc_ssd_info)); | |
178 | ssd->path_mask = pmcw->pim; | |
179 | for (i = 0; i < 8; i++) { | |
180 | mask = 0x80 >> i; | |
181 | if (pmcw->pim & mask) { | |
182 | chp_id_init(&ssd->chpid[i]); | |
183 | ssd->chpid[i].id = pmcw->chpid[i]; | |
184 | } | |
185 | } | |
186 | } | |
187 | ||
188 | static void ssd_register_chpids(struct chsc_ssd_info *ssd) | |
189 | { | |
190 | int i; | |
191 | int mask; | |
192 | ||
193 | for (i = 0; i < 8; i++) { | |
194 | mask = 0x80 >> i; | |
195 | if (ssd->path_mask & mask) | |
196 | if (!chp_is_registered(ssd->chpid[i])) | |
197 | chp_new(ssd->chpid[i]); | |
198 | } | |
199 | } | |
200 | ||
201 | void css_update_ssd_info(struct subchannel *sch) | |
202 | { | |
203 | int ret; | |
204 | ||
205 | if (cio_is_console(sch->schid)) { | |
206 | /* Console is initialized too early for functions requiring | |
207 | * memory allocation. */ | |
208 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
209 | } else { | |
210 | ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); | |
211 | if (ret) | |
212 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
213 | ssd_register_chpids(&sch->ssd_info); | |
214 | } | |
215 | } | |
216 | ||
7e9db9ea CH |
217 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
218 | char *buf) | |
219 | { | |
220 | struct subchannel *sch = to_subchannel(dev); | |
221 | ||
222 | return sprintf(buf, "%01x\n", sch->st); | |
223 | } | |
224 | ||
225 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
226 | ||
227 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
228 | char *buf) | |
229 | { | |
230 | struct subchannel *sch = to_subchannel(dev); | |
231 | ||
232 | return sprintf(buf, "css:t%01X\n", sch->st); | |
233 | } | |
234 | ||
235 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); | |
236 | ||
237 | static struct attribute *subch_attrs[] = { | |
238 | &dev_attr_type.attr, | |
239 | &dev_attr_modalias.attr, | |
240 | NULL, | |
241 | }; | |
242 | ||
243 | static struct attribute_group subch_attr_group = { | |
244 | .attrs = subch_attrs, | |
245 | }; | |
246 | ||
247 | static struct attribute_group *default_subch_attr_groups[] = { | |
248 | &subch_attr_group, | |
249 | NULL, | |
250 | }; | |
251 | ||
7ad6a249 | 252 | static int css_register_subchannel(struct subchannel *sch) |
1da177e4 LT |
253 | { |
254 | int ret; | |
255 | ||
256 | /* Initialize the subchannel structure */ | |
7c9f4e3a | 257 | sch->dev.parent = &channel_subsystems[0]->device; |
1da177e4 LT |
258 | sch->dev.bus = &css_bus_type; |
259 | sch->dev.release = &css_subchannel_release; | |
7e9db9ea | 260 | sch->dev.groups = default_subch_attr_groups; |
5bf04b20 CH |
261 | /* |
262 | * We don't want to generate uevents for I/O subchannels that don't | |
263 | * have a working ccw device behind them since they will be | |
264 | * unregistered before they can be used anyway, so we delay the add | |
265 | * uevent until after device recognition was successful. | |
7e9db9ea CH |
266 | * Note that we suppress the uevent for all subchannel types; |
267 | * the subchannel driver can decide itself when it wants to inform | |
268 | * userspace of its existence. | |
5bf04b20 | 269 | */ |
7e9db9ea | 270 | sch->dev.uevent_suppress = 1; |
7ad6a249 | 271 | css_update_ssd_info(sch); |
1da177e4 | 272 | /* make it known to the system */ |
6ab4879a | 273 | ret = css_sch_device_register(sch); |
7674da77 | 274 | if (ret) { |
e556bbbd CH |
275 | CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n", |
276 | sch->schid.ssid, sch->schid.sch_no, ret); | |
7674da77 CH |
277 | return ret; |
278 | } | |
7e9db9ea CH |
279 | if (!sch->driver) { |
280 | /* | |
281 | * No driver matched. Generate the uevent now so that | |
282 | * a fitting driver module may be loaded based on the | |
283 | * modalias. | |
284 | */ | |
285 | sch->dev.uevent_suppress = 0; | |
286 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); | |
287 | } | |
1da177e4 LT |
288 | return ret; |
289 | } | |
290 | ||
c820de39 | 291 | int css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
292 | { |
293 | int ret; | |
294 | struct subchannel *sch; | |
295 | ||
a8237fc4 | 296 | sch = css_alloc_subchannel(schid); |
1da177e4 LT |
297 | if (IS_ERR(sch)) |
298 | return PTR_ERR(sch); | |
299 | ret = css_register_subchannel(sch); | |
300 | if (ret) | |
301 | css_free_subchannel(sch); | |
302 | return ret; | |
303 | } | |
304 | ||
b0744bd2 CH |
305 | static int |
306 | check_subchannel(struct device * dev, void * data) | |
307 | { | |
308 | struct subchannel *sch; | |
a8237fc4 | 309 | struct subchannel_id *schid = data; |
b0744bd2 CH |
310 | |
311 | sch = to_subchannel(dev); | |
a8237fc4 | 312 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
313 | } |
314 | ||
1da177e4 | 315 | struct subchannel * |
a8237fc4 | 316 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 317 | { |
1da177e4 LT |
318 | struct device *dev; |
319 | ||
b0744bd2 | 320 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 321 | &schid, check_subchannel); |
1da177e4 | 322 | |
b0744bd2 | 323 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
324 | } |
325 | ||
b279a4f5 CH |
326 | /** |
327 | * css_sch_is_valid() - check if a subchannel is valid | |
328 | * @schib: subchannel information block for the subchannel | |
329 | */ | |
330 | int css_sch_is_valid(struct schib *schib) | |
331 | { | |
332 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) | |
333 | return 0; | |
b3a686f4 CH |
334 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) |
335 | return 0; | |
b279a4f5 CH |
336 | return 1; |
337 | } | |
338 | EXPORT_SYMBOL_GPL(css_sch_is_valid); | |
339 | ||
564337f3 PO |
340 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) |
341 | { | |
342 | struct schib schib; | |
343 | ||
344 | if (!slow) { | |
345 | /* Will be done on the slow path. */ | |
346 | return -EAGAIN; | |
347 | } | |
b279a4f5 | 348 | if (stsch_err(schid, &schib) || !css_sch_is_valid(&schib)) { |
564337f3 PO |
349 | /* Unusable - ignore. */ |
350 | return 0; | |
1da177e4 | 351 | } |
564337f3 PO |
352 | CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, " |
353 | "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER); | |
354 | ||
355 | return css_probe_device(schid); | |
356 | } | |
357 | ||
c820de39 CH |
358 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) |
359 | { | |
360 | int ret = 0; | |
361 | ||
362 | if (sch->driver) { | |
363 | if (sch->driver->sch_event) | |
364 | ret = sch->driver->sch_event(sch, slow); | |
365 | else | |
366 | dev_dbg(&sch->dev, | |
367 | "Got subchannel machine check but " | |
368 | "no sch_event handler provided.\n"); | |
369 | } | |
370 | return ret; | |
371 | } | |
372 | ||
83b3370c | 373 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
374 | { |
375 | struct subchannel *sch; | |
376 | int ret; | |
377 | ||
378 | sch = get_subchannel_by_schid(schid); | |
379 | if (sch) { | |
380 | ret = css_evaluate_known_subchannel(sch, slow); | |
381 | put_device(&sch->dev); | |
382 | } else | |
383 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
384 | if (ret == -EAGAIN) |
385 | css_schedule_eval(schid); | |
1da177e4 LT |
386 | } |
387 | ||
83b3370c PO |
388 | static struct idset *slow_subchannel_set; |
389 | static spinlock_t slow_subchannel_lock; | |
390 | ||
391 | static int __init slow_subchannel_init(void) | |
1da177e4 | 392 | { |
83b3370c PO |
393 | spin_lock_init(&slow_subchannel_lock); |
394 | slow_subchannel_set = idset_sch_new(); | |
395 | if (!slow_subchannel_set) { | |
e556bbbd | 396 | CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); |
83b3370c PO |
397 | return -ENOMEM; |
398 | } | |
399 | return 0; | |
1da177e4 LT |
400 | } |
401 | ||
e82a1567 | 402 | static int slow_eval_known_fn(struct subchannel *sch, void *data) |
1da177e4 | 403 | { |
e82a1567 PO |
404 | int eval; |
405 | int rc; | |
1da177e4 LT |
406 | |
407 | spin_lock_irq(&slow_subchannel_lock); | |
e82a1567 PO |
408 | eval = idset_sch_contains(slow_subchannel_set, sch->schid); |
409 | idset_sch_del(slow_subchannel_set, sch->schid); | |
410 | spin_unlock_irq(&slow_subchannel_lock); | |
411 | if (eval) { | |
412 | rc = css_evaluate_known_subchannel(sch, 1); | |
413 | if (rc == -EAGAIN) | |
414 | css_schedule_eval(sch->schid); | |
1da177e4 | 415 | } |
e82a1567 PO |
416 | return 0; |
417 | } | |
418 | ||
419 | static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) | |
420 | { | |
421 | int eval; | |
422 | int rc = 0; | |
423 | ||
424 | spin_lock_irq(&slow_subchannel_lock); | |
425 | eval = idset_sch_contains(slow_subchannel_set, schid); | |
426 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 427 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
428 | if (eval) { |
429 | rc = css_evaluate_new_subchannel(schid, 1); | |
430 | switch (rc) { | |
431 | case -EAGAIN: | |
432 | css_schedule_eval(schid); | |
433 | rc = 0; | |
434 | break; | |
435 | case -ENXIO: | |
436 | case -ENOMEM: | |
437 | case -EIO: | |
438 | /* These should abort looping */ | |
439 | break; | |
440 | default: | |
441 | rc = 0; | |
442 | } | |
443 | } | |
444 | return rc; | |
445 | } | |
446 | ||
447 | static void css_slow_path_func(struct work_struct *unused) | |
448 | { | |
449 | CIO_TRACE_EVENT(4, "slowpath"); | |
450 | for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, | |
451 | NULL); | |
1da177e4 LT |
452 | } |
453 | ||
83b3370c | 454 | static DECLARE_WORK(slow_path_work, css_slow_path_func); |
1da177e4 LT |
455 | struct workqueue_struct *slow_path_wq; |
456 | ||
83b3370c PO |
457 | void css_schedule_eval(struct subchannel_id schid) |
458 | { | |
459 | unsigned long flags; | |
460 | ||
461 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
462 | idset_sch_add(slow_subchannel_set, schid); | |
463 | queue_work(slow_path_wq, &slow_path_work); | |
464 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
465 | } | |
466 | ||
467 | void css_schedule_eval_all(void) | |
468 | { | |
469 | unsigned long flags; | |
470 | ||
471 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
472 | idset_fill(slow_subchannel_set); | |
473 | queue_work(slow_path_wq, &slow_path_work); | |
474 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
475 | } | |
476 | ||
22806dc1 CH |
477 | void css_wait_for_slow_path(void) |
478 | { | |
479 | flush_workqueue(ccw_device_notify_work); | |
480 | flush_workqueue(slow_path_wq); | |
481 | } | |
482 | ||
40154b82 PO |
483 | /* Reprobe subchannel if unregistered. */ |
484 | static int reprobe_subchannel(struct subchannel_id schid, void *data) | |
485 | { | |
40154b82 PO |
486 | int ret; |
487 | ||
e556bbbd CH |
488 | CIO_MSG_EVENT(6, "cio: reprobe 0.%x.%04x\n", |
489 | schid.ssid, schid.sch_no); | |
40154b82 PO |
490 | if (need_reprobe) |
491 | return -EAGAIN; | |
492 | ||
40154b82 PO |
493 | ret = css_probe_device(schid); |
494 | switch (ret) { | |
495 | case 0: | |
496 | break; | |
497 | case -ENXIO: | |
498 | case -ENOMEM: | |
67175616 | 499 | case -EIO: |
40154b82 PO |
500 | /* These should abort looping */ |
501 | break; | |
502 | default: | |
503 | ret = 0; | |
504 | } | |
505 | ||
506 | return ret; | |
507 | } | |
508 | ||
509 | /* Work function used to reprobe all unregistered subchannels. */ | |
4927b3f7 | 510 | static void reprobe_all(struct work_struct *unused) |
40154b82 PO |
511 | { |
512 | int ret; | |
513 | ||
139b83dd | 514 | CIO_MSG_EVENT(4, "reprobe start\n"); |
40154b82 PO |
515 | |
516 | need_reprobe = 0; | |
517 | /* Make sure initial subchannel scan is done. */ | |
518 | wait_event(ccw_device_init_wq, | |
519 | atomic_read(&ccw_device_init_count) == 0); | |
e82a1567 | 520 | ret = for_each_subchannel_staged(NULL, reprobe_subchannel, NULL); |
40154b82 | 521 | |
139b83dd | 522 | CIO_MSG_EVENT(4, "reprobe done (rc=%d, need_reprobe=%d)\n", ret, |
40154b82 PO |
523 | need_reprobe); |
524 | } | |
525 | ||
2b67fc46 | 526 | static DECLARE_WORK(css_reprobe_work, reprobe_all); |
40154b82 PO |
527 | |
528 | /* Schedule reprobing of all unregistered subchannels. */ | |
529 | void css_schedule_reprobe(void) | |
530 | { | |
531 | need_reprobe = 1; | |
c5d4a999 | 532 | queue_work(slow_path_wq, &css_reprobe_work); |
40154b82 PO |
533 | } |
534 | ||
535 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); | |
536 | ||
1da177e4 LT |
537 | /* |
538 | * Called from the machine check handler for subchannel report words. | |
539 | */ | |
c1156189 | 540 | static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
1da177e4 | 541 | { |
a8237fc4 | 542 | struct subchannel_id mchk_schid; |
1da177e4 | 543 | |
c1156189 CH |
544 | if (overflow) { |
545 | css_schedule_eval_all(); | |
546 | return; | |
547 | } | |
548 | CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " | |
549 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
550 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
551 | crw0->erc, crw0->rsid); | |
552 | if (crw1) | |
553 | CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " | |
554 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
555 | crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, | |
556 | crw1->anc, crw1->erc, crw1->rsid); | |
a8237fc4 | 557 | init_subchannel_id(&mchk_schid); |
c1156189 CH |
558 | mchk_schid.sch_no = crw0->rsid; |
559 | if (crw1) | |
560 | mchk_schid.ssid = (crw1->rsid >> 8) & 3; | |
fb6958a5 | 561 | |
c1156189 | 562 | /* |
1da177e4 LT |
563 | * Since we are always presented with IPI in the CRW, we have to |
564 | * use stsch() to find out if the subchannel in question has come | |
565 | * or gone. | |
566 | */ | |
83b3370c | 567 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
568 | } |
569 | ||
f97a56fb CH |
570 | static int __init |
571 | __init_channel_subsystem(struct subchannel_id schid, void *data) | |
572 | { | |
573 | struct subchannel *sch; | |
574 | int ret; | |
575 | ||
576 | if (cio_is_console(schid)) | |
577 | sch = cio_get_console_subchannel(); | |
578 | else { | |
579 | sch = css_alloc_subchannel(schid); | |
580 | if (IS_ERR(sch)) | |
581 | ret = PTR_ERR(sch); | |
582 | else | |
583 | ret = 0; | |
584 | switch (ret) { | |
585 | case 0: | |
586 | break; | |
587 | case -ENOMEM: | |
588 | panic("Out of memory in init_channel_subsystem\n"); | |
589 | /* -ENXIO: no more subchannels. */ | |
590 | case -ENXIO: | |
591 | return ret; | |
e843e280 GS |
592 | /* -EIO: this subchannel set not supported. */ |
593 | case -EIO: | |
594 | return ret; | |
f97a56fb CH |
595 | default: |
596 | return 0; | |
597 | } | |
598 | } | |
599 | /* | |
600 | * We register ALL valid subchannels in ioinfo, even those | |
601 | * that have been present before init_channel_subsystem. | |
602 | * These subchannels can't have been registered yet (kmalloc | |
603 | * not working) so we do it now. This is true e.g. for the | |
604 | * console subchannel. | |
605 | */ | |
606 | css_register_subchannel(sch); | |
607 | return 0; | |
608 | } | |
609 | ||
1da177e4 | 610 | static void __init |
a28c6944 | 611 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 612 | { |
75784c00 | 613 | if (css_general_characteristics.mcss) { |
a28c6944 CH |
614 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
615 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
616 | } else { | |
1da177e4 | 617 | #ifdef CONFIG_SMP |
a28c6944 | 618 | css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id(); |
1da177e4 | 619 | #else |
a28c6944 | 620 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
621 | #endif |
622 | } | |
a28c6944 CH |
623 | css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident; |
624 | css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine; | |
625 | css->global_pgid.tod_high = tod_high; | |
626 | ||
627 | } | |
628 | ||
3b793060 CH |
629 | static void |
630 | channel_subsystem_release(struct device *dev) | |
631 | { | |
632 | struct channel_subsystem *css; | |
633 | ||
634 | css = to_css(dev); | |
495a5b45 | 635 | mutex_destroy(&css->mutex); |
3b793060 CH |
636 | kfree(css); |
637 | } | |
638 | ||
495a5b45 CH |
639 | static ssize_t |
640 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
641 | char *buf) | |
642 | { | |
643 | struct channel_subsystem *css = to_css(dev); | |
8284fb19 | 644 | int ret; |
495a5b45 CH |
645 | |
646 | if (!css) | |
647 | return 0; | |
8284fb19 ME |
648 | mutex_lock(&css->mutex); |
649 | ret = sprintf(buf, "%x\n", css->cm_enabled); | |
650 | mutex_unlock(&css->mutex); | |
651 | return ret; | |
495a5b45 CH |
652 | } |
653 | ||
654 | static ssize_t | |
655 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
656 | const char *buf, size_t count) | |
657 | { | |
658 | struct channel_subsystem *css = to_css(dev); | |
659 | int ret; | |
2f972202 | 660 | unsigned long val; |
495a5b45 | 661 | |
2f972202 CH |
662 | ret = strict_strtoul(buf, 16, &val); |
663 | if (ret) | |
664 | return ret; | |
8284fb19 | 665 | mutex_lock(&css->mutex); |
2f972202 CH |
666 | switch (val) { |
667 | case 0: | |
495a5b45 CH |
668 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; |
669 | break; | |
2f972202 | 670 | case 1: |
495a5b45 CH |
671 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); |
672 | break; | |
673 | default: | |
674 | ret = -EINVAL; | |
675 | } | |
8284fb19 | 676 | mutex_unlock(&css->mutex); |
495a5b45 CH |
677 | return ret < 0 ? ret : count; |
678 | } | |
679 | ||
680 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
681 | ||
4d284cac | 682 | static int __init setup_css(int nr) |
a28c6944 CH |
683 | { |
684 | u32 tod_high; | |
d7b5a4c9 | 685 | int ret; |
7c9f4e3a | 686 | struct channel_subsystem *css; |
a28c6944 | 687 | |
7c9f4e3a CH |
688 | css = channel_subsystems[nr]; |
689 | memset(css, 0, sizeof(struct channel_subsystem)); | |
690 | css->pseudo_subchannel = | |
691 | kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL); | |
692 | if (!css->pseudo_subchannel) | |
d7b5a4c9 | 693 | return -ENOMEM; |
7c9f4e3a CH |
694 | css->pseudo_subchannel->dev.parent = &css->device; |
695 | css->pseudo_subchannel->dev.release = css_subchannel_release; | |
696 | sprintf(css->pseudo_subchannel->dev.bus_id, "defunct"); | |
697 | ret = cio_create_sch_lock(css->pseudo_subchannel); | |
d7b5a4c9 | 698 | if (ret) { |
7c9f4e3a | 699 | kfree(css->pseudo_subchannel); |
d7b5a4c9 CH |
700 | return ret; |
701 | } | |
7c9f4e3a CH |
702 | mutex_init(&css->mutex); |
703 | css->valid = 1; | |
704 | css->cssid = nr; | |
705 | sprintf(css->device.bus_id, "css%x", nr); | |
706 | css->device.release = channel_subsystem_release; | |
a28c6944 | 707 | tod_high = (u32) (get_clock() >> 32); |
7c9f4e3a | 708 | css_generate_pgid(css, tod_high); |
d7b5a4c9 | 709 | return 0; |
1da177e4 LT |
710 | } |
711 | ||
a55360df CH |
712 | static int css_reboot_event(struct notifier_block *this, |
713 | unsigned long event, | |
714 | void *ptr) | |
715 | { | |
716 | int ret, i; | |
717 | ||
718 | ret = NOTIFY_DONE; | |
719 | for (i = 0; i <= __MAX_CSSID; i++) { | |
720 | struct channel_subsystem *css; | |
721 | ||
722 | css = channel_subsystems[i]; | |
8284fb19 | 723 | mutex_lock(&css->mutex); |
a55360df CH |
724 | if (css->cm_enabled) |
725 | if (chsc_secm(css, 0)) | |
726 | ret = NOTIFY_BAD; | |
8284fb19 | 727 | mutex_unlock(&css->mutex); |
a55360df CH |
728 | } |
729 | ||
730 | return ret; | |
731 | } | |
732 | ||
733 | static struct notifier_block css_reboot_notifier = { | |
734 | .notifier_call = css_reboot_event, | |
735 | }; | |
736 | ||
1da177e4 LT |
737 | /* |
738 | * Now that the driver core is running, we can setup our channel subsystem. | |
739 | * The struct subchannel's are created during probing (except for the | |
740 | * static console subchannel). | |
741 | */ | |
742 | static int __init | |
743 | init_channel_subsystem (void) | |
744 | { | |
a28c6944 | 745 | int ret, i; |
1da177e4 | 746 | |
4434a38c CH |
747 | ret = chsc_determine_css_characteristics(); |
748 | if (ret == -ENOMEM) | |
749 | goto out; /* No need to continue. */ | |
1da177e4 | 750 | |
4434a38c CH |
751 | ret = chsc_alloc_sei_area(); |
752 | if (ret) | |
753 | goto out; | |
754 | ||
755 | ret = slow_subchannel_init(); | |
756 | if (ret) | |
757 | goto out; | |
758 | ||
c1156189 CH |
759 | ret = s390_register_crw_handler(CRW_RSC_SCH, css_process_crw); |
760 | if (ret) | |
761 | goto out; | |
762 | ||
1da177e4 LT |
763 | if ((ret = bus_register(&css_bus_type))) |
764 | goto out; | |
1da177e4 | 765 | |
fb6958a5 CH |
766 | /* Try to enable MSS. */ |
767 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
768 | switch (ret) { | |
769 | case 0: /* Success. */ | |
770 | max_ssid = __MAX_SSID; | |
771 | break; | |
772 | case -ENOMEM: | |
773 | goto out_bus; | |
774 | default: | |
775 | max_ssid = 0; | |
776 | } | |
a28c6944 CH |
777 | /* Setup css structure. */ |
778 | for (i = 0; i <= __MAX_CSSID; i++) { | |
7c9f4e3a CH |
779 | struct channel_subsystem *css; |
780 | ||
781 | css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
782 | if (!css) { | |
a28c6944 | 783 | ret = -ENOMEM; |
fb6958a5 | 784 | goto out_unregister; |
a28c6944 | 785 | } |
7c9f4e3a | 786 | channel_subsystems[i] = css; |
d7b5a4c9 | 787 | ret = setup_css(i); |
a28c6944 CH |
788 | if (ret) |
789 | goto out_free; | |
7c9f4e3a | 790 | ret = device_register(&css->device); |
d7b5a4c9 CH |
791 | if (ret) |
792 | goto out_free_all; | |
75784c00 | 793 | if (css_chsc_characteristics.secm) { |
7c9f4e3a | 794 | ret = device_create_file(&css->device, |
7e560814 CH |
795 | &dev_attr_cm_enable); |
796 | if (ret) | |
797 | goto out_device; | |
798 | } | |
7c9f4e3a | 799 | ret = device_register(&css->pseudo_subchannel->dev); |
d7b5a4c9 CH |
800 | if (ret) |
801 | goto out_file; | |
a28c6944 | 802 | } |
a55360df CH |
803 | ret = register_reboot_notifier(&css_reboot_notifier); |
804 | if (ret) | |
805 | goto out_pseudo; | |
1da177e4 LT |
806 | css_init_done = 1; |
807 | ||
3a3fc29a | 808 | /* Enable default isc for I/O subchannels. */ |
6ef556cc | 809 | isc_register(IO_SCH_ISC); |
1da177e4 | 810 | |
f97a56fb | 811 | for_each_subchannel(__init_channel_subsystem, NULL); |
1da177e4 | 812 | return 0; |
a55360df CH |
813 | out_pseudo: |
814 | device_unregister(&channel_subsystems[i]->pseudo_subchannel->dev); | |
d7b5a4c9 | 815 | out_file: |
7c9f4e3a CH |
816 | device_remove_file(&channel_subsystems[i]->device, |
817 | &dev_attr_cm_enable); | |
7e560814 | 818 | out_device: |
7c9f4e3a | 819 | device_unregister(&channel_subsystems[i]->device); |
d7b5a4c9 | 820 | out_free_all: |
7c9f4e3a CH |
821 | kfree(channel_subsystems[i]->pseudo_subchannel->lock); |
822 | kfree(channel_subsystems[i]->pseudo_subchannel); | |
a28c6944 | 823 | out_free: |
7c9f4e3a | 824 | kfree(channel_subsystems[i]); |
fb6958a5 | 825 | out_unregister: |
a28c6944 | 826 | while (i > 0) { |
7c9f4e3a CH |
827 | struct channel_subsystem *css; |
828 | ||
a28c6944 | 829 | i--; |
7c9f4e3a CH |
830 | css = channel_subsystems[i]; |
831 | device_unregister(&css->pseudo_subchannel->dev); | |
75784c00 | 832 | if (css_chsc_characteristics.secm) |
7c9f4e3a | 833 | device_remove_file(&css->device, |
495a5b45 | 834 | &dev_attr_cm_enable); |
7c9f4e3a | 835 | device_unregister(&css->device); |
a28c6944 | 836 | } |
fb6958a5 | 837 | out_bus: |
1da177e4 LT |
838 | bus_unregister(&css_bus_type); |
839 | out: | |
c1156189 | 840 | s390_unregister_crw_handler(CRW_RSC_CSS); |
4434a38c CH |
841 | chsc_free_sei_area(); |
842 | kfree(slow_subchannel_set); | |
843 | printk(KERN_WARNING"cio: failed to initialize css driver (%d)!\n", | |
844 | ret); | |
1da177e4 LT |
845 | return ret; |
846 | } | |
847 | ||
d7b5a4c9 CH |
848 | int sch_is_pseudo_sch(struct subchannel *sch) |
849 | { | |
850 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
851 | } | |
852 | ||
1da177e4 LT |
853 | /* |
854 | * find a driver for a subchannel. They identify by the subchannel | |
855 | * type with the exception that the console subchannel driver has its own | |
856 | * subchannel type although the device is an i/o subchannel | |
857 | */ | |
858 | static int | |
859 | css_bus_match (struct device *dev, struct device_driver *drv) | |
860 | { | |
084325d8 CH |
861 | struct subchannel *sch = to_subchannel(dev); |
862 | struct css_driver *driver = to_cssdriver(drv); | |
1da177e4 LT |
863 | |
864 | if (sch->st == driver->subchannel_type) | |
865 | return 1; | |
866 | ||
867 | return 0; | |
868 | } | |
869 | ||
98c13c28 | 870 | static int css_probe(struct device *dev) |
8bbace7e CH |
871 | { |
872 | struct subchannel *sch; | |
98c13c28 | 873 | int ret; |
8bbace7e CH |
874 | |
875 | sch = to_subchannel(dev); | |
084325d8 | 876 | sch->driver = to_cssdriver(dev->driver); |
98c13c28 CH |
877 | ret = sch->driver->probe ? sch->driver->probe(sch) : 0; |
878 | if (ret) | |
879 | sch->driver = NULL; | |
880 | return ret; | |
8bbace7e CH |
881 | } |
882 | ||
98c13c28 | 883 | static int css_remove(struct device *dev) |
8bbace7e CH |
884 | { |
885 | struct subchannel *sch; | |
98c13c28 | 886 | int ret; |
8bbace7e CH |
887 | |
888 | sch = to_subchannel(dev); | |
98c13c28 CH |
889 | ret = sch->driver->remove ? sch->driver->remove(sch) : 0; |
890 | sch->driver = NULL; | |
891 | return ret; | |
8bbace7e CH |
892 | } |
893 | ||
98c13c28 | 894 | static void css_shutdown(struct device *dev) |
8bbace7e CH |
895 | { |
896 | struct subchannel *sch; | |
897 | ||
898 | sch = to_subchannel(dev); | |
98c13c28 | 899 | if (sch->driver && sch->driver->shutdown) |
8bbace7e CH |
900 | sch->driver->shutdown(sch); |
901 | } | |
902 | ||
7e9db9ea CH |
903 | static int css_uevent(struct device *dev, struct kobj_uevent_env *env) |
904 | { | |
905 | struct subchannel *sch = to_subchannel(dev); | |
906 | int ret; | |
907 | ||
908 | ret = add_uevent_var(env, "ST=%01X", sch->st); | |
909 | if (ret) | |
910 | return ret; | |
911 | ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); | |
912 | return ret; | |
913 | } | |
914 | ||
1da177e4 | 915 | struct bus_type css_bus_type = { |
8bbace7e CH |
916 | .name = "css", |
917 | .match = css_bus_match, | |
918 | .probe = css_probe, | |
919 | .remove = css_remove, | |
920 | .shutdown = css_shutdown, | |
7e9db9ea | 921 | .uevent = css_uevent, |
1da177e4 LT |
922 | }; |
923 | ||
25b7bb58 CH |
924 | /** |
925 | * css_driver_register - register a css driver | |
926 | * @cdrv: css driver to register | |
927 | * | |
928 | * This is mainly a wrapper around driver_register that sets name | |
929 | * and bus_type in the embedded struct device_driver correctly. | |
930 | */ | |
931 | int css_driver_register(struct css_driver *cdrv) | |
932 | { | |
933 | cdrv->drv.name = cdrv->name; | |
934 | cdrv->drv.bus = &css_bus_type; | |
4beee646 | 935 | cdrv->drv.owner = cdrv->owner; |
25b7bb58 CH |
936 | return driver_register(&cdrv->drv); |
937 | } | |
938 | EXPORT_SYMBOL_GPL(css_driver_register); | |
939 | ||
940 | /** | |
941 | * css_driver_unregister - unregister a css driver | |
942 | * @cdrv: css driver to unregister | |
943 | * | |
944 | * This is a wrapper around driver_unregister. | |
945 | */ | |
946 | void css_driver_unregister(struct css_driver *cdrv) | |
947 | { | |
948 | driver_unregister(&cdrv->drv); | |
949 | } | |
950 | EXPORT_SYMBOL_GPL(css_driver_unregister); | |
951 | ||
1da177e4 LT |
952 | subsys_initcall(init_channel_subsystem); |
953 | ||
1da177e4 LT |
954 | MODULE_LICENSE("GPL"); |
955 | EXPORT_SYMBOL(css_bus_type); |