Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
dcbd16d5 | 2 | * driver for channel subsystem |
1da177e4 | 3 | * |
34aec07c | 4 | * Copyright IBM Corp. 2002, 2010 |
dcbd16d5 SO |
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> |
879acca5 | 21 | #include <linux/proc_fs.h> |
3a3fc29a | 22 | #include <asm/isc.h> |
f5daba1d | 23 | #include <asm/crw.h> |
1da177e4 LT |
24 | |
25 | #include "css.h" | |
26 | #include "cio.h" | |
27 | #include "cio_debug.h" | |
28 | #include "ioasm.h" | |
29 | #include "chsc.h" | |
40154b82 | 30 | #include "device.h" |
83b3370c | 31 | #include "idset.h" |
7ad6a249 | 32 | #include "chp.h" |
1da177e4 | 33 | |
1da177e4 | 34 | int css_init_done = 0; |
b0a285d3 | 35 | int max_ssid; |
1da177e4 | 36 | |
7c9f4e3a | 37 | struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1]; |
3041b6ab | 38 | static struct bus_type css_bus_type; |
1da177e4 | 39 | |
4d284cac | 40 | int |
f97a56fb CH |
41 | for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) |
42 | { | |
43 | struct subchannel_id schid; | |
44 | int ret; | |
45 | ||
46 | init_subchannel_id(&schid); | |
47 | ret = -ENODEV; | |
48 | do { | |
fb6958a5 CH |
49 | do { |
50 | ret = fn(schid, data); | |
51 | if (ret) | |
52 | break; | |
53 | } while (schid.sch_no++ < __MAX_SUBCHANNEL); | |
54 | schid.sch_no = 0; | |
55 | } while (schid.ssid++ < max_ssid); | |
f97a56fb CH |
56 | return ret; |
57 | } | |
58 | ||
e82a1567 PO |
59 | struct cb_data { |
60 | void *data; | |
61 | struct idset *set; | |
62 | int (*fn_known_sch)(struct subchannel *, void *); | |
63 | int (*fn_unknown_sch)(struct subchannel_id, void *); | |
64 | }; | |
65 | ||
66 | static int call_fn_known_sch(struct device *dev, void *data) | |
67 | { | |
68 | struct subchannel *sch = to_subchannel(dev); | |
69 | struct cb_data *cb = data; | |
70 | int rc = 0; | |
71 | ||
72 | idset_sch_del(cb->set, sch->schid); | |
73 | if (cb->fn_known_sch) | |
74 | rc = cb->fn_known_sch(sch, cb->data); | |
75 | return rc; | |
76 | } | |
77 | ||
78 | static int call_fn_unknown_sch(struct subchannel_id schid, void *data) | |
79 | { | |
80 | struct cb_data *cb = data; | |
81 | int rc = 0; | |
82 | ||
83 | if (idset_sch_contains(cb->set, schid)) | |
84 | rc = cb->fn_unknown_sch(schid, cb->data); | |
85 | return rc; | |
86 | } | |
87 | ||
90ac24a5 SO |
88 | static int call_fn_all_sch(struct subchannel_id schid, void *data) |
89 | { | |
90 | struct cb_data *cb = data; | |
91 | struct subchannel *sch; | |
92 | int rc = 0; | |
93 | ||
94 | sch = get_subchannel_by_schid(schid); | |
95 | if (sch) { | |
96 | if (cb->fn_known_sch) | |
97 | rc = cb->fn_known_sch(sch, cb->data); | |
98 | put_device(&sch->dev); | |
99 | } else { | |
100 | if (cb->fn_unknown_sch) | |
101 | rc = cb->fn_unknown_sch(schid, cb->data); | |
102 | } | |
103 | ||
104 | return rc; | |
105 | } | |
106 | ||
e82a1567 PO |
107 | int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), |
108 | int (*fn_unknown)(struct subchannel_id, | |
109 | void *), void *data) | |
110 | { | |
111 | struct cb_data cb; | |
112 | int rc; | |
113 | ||
e82a1567 PO |
114 | cb.data = data; |
115 | cb.fn_known_sch = fn_known; | |
116 | cb.fn_unknown_sch = fn_unknown; | |
90ac24a5 SO |
117 | |
118 | cb.set = idset_sch_new(); | |
119 | if (!cb.set) | |
120 | /* fall back to brute force scanning in case of oom */ | |
121 | return for_each_subchannel(call_fn_all_sch, &cb); | |
122 | ||
123 | idset_fill(cb.set); | |
124 | ||
e82a1567 PO |
125 | /* Process registered subchannels. */ |
126 | rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); | |
127 | if (rc) | |
128 | goto out; | |
129 | /* Process unregistered subchannels. */ | |
130 | if (fn_unknown) | |
131 | rc = for_each_subchannel(call_fn_unknown_sch, &cb); | |
132 | out: | |
133 | idset_free(cb.set); | |
134 | ||
135 | return rc; | |
136 | } | |
137 | ||
390935ac PO |
138 | static void css_sch_todo(struct work_struct *work); |
139 | ||
1da177e4 | 140 | static struct subchannel * |
a8237fc4 | 141 | css_alloc_subchannel(struct subchannel_id schid) |
1da177e4 LT |
142 | { |
143 | struct subchannel *sch; | |
144 | int ret; | |
145 | ||
146 | sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA); | |
147 | if (sch == NULL) | |
148 | return ERR_PTR(-ENOMEM); | |
a8237fc4 | 149 | ret = cio_validate_subchannel (sch, schid); |
1da177e4 LT |
150 | if (ret < 0) { |
151 | kfree(sch); | |
152 | return ERR_PTR(ret); | |
153 | } | |
390935ac | 154 | INIT_WORK(&sch->todo_work, css_sch_todo); |
1da177e4 LT |
155 | return sch; |
156 | } | |
157 | ||
1da177e4 LT |
158 | static void |
159 | css_subchannel_release(struct device *dev) | |
160 | { | |
161 | struct subchannel *sch; | |
162 | ||
163 | sch = to_subchannel(dev); | |
2ec22984 | 164 | if (!cio_is_console(sch->schid)) { |
1da73bc8 PO |
165 | /* Reset intparm to zeroes. */ |
166 | sch->config.intparm = 0; | |
167 | cio_commit_config(sch); | |
2ec22984 | 168 | kfree(sch->lock); |
1da177e4 | 169 | kfree(sch); |
2ec22984 | 170 | } |
1da177e4 LT |
171 | } |
172 | ||
07c6a338 | 173 | static int css_sch_device_register(struct subchannel *sch) |
6ab4879a CH |
174 | { |
175 | int ret; | |
176 | ||
177 | mutex_lock(&sch->reg_mutex); | |
6ee4fec6 SO |
178 | dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, |
179 | sch->schid.sch_no); | |
6ab4879a CH |
180 | ret = device_register(&sch->dev); |
181 | mutex_unlock(&sch->reg_mutex); | |
182 | return ret; | |
183 | } | |
184 | ||
44a1c19e CH |
185 | /** |
186 | * css_sch_device_unregister - unregister a subchannel | |
187 | * @sch: subchannel to be unregistered | |
188 | */ | |
6ab4879a CH |
189 | void css_sch_device_unregister(struct subchannel *sch) |
190 | { | |
191 | mutex_lock(&sch->reg_mutex); | |
ef60cd13 SO |
192 | if (device_is_registered(&sch->dev)) |
193 | device_unregister(&sch->dev); | |
6ab4879a CH |
194 | mutex_unlock(&sch->reg_mutex); |
195 | } | |
44a1c19e | 196 | EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
6ab4879a | 197 | |
7ad6a249 PO |
198 | static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) |
199 | { | |
200 | int i; | |
201 | int mask; | |
202 | ||
203 | memset(ssd, 0, sizeof(struct chsc_ssd_info)); | |
204 | ssd->path_mask = pmcw->pim; | |
205 | for (i = 0; i < 8; i++) { | |
206 | mask = 0x80 >> i; | |
207 | if (pmcw->pim & mask) { | |
208 | chp_id_init(&ssd->chpid[i]); | |
209 | ssd->chpid[i].id = pmcw->chpid[i]; | |
210 | } | |
211 | } | |
212 | } | |
213 | ||
214 | static void ssd_register_chpids(struct chsc_ssd_info *ssd) | |
215 | { | |
216 | int i; | |
217 | int mask; | |
218 | ||
219 | for (i = 0; i < 8; i++) { | |
220 | mask = 0x80 >> i; | |
221 | if (ssd->path_mask & mask) | |
222 | if (!chp_is_registered(ssd->chpid[i])) | |
223 | chp_new(ssd->chpid[i]); | |
224 | } | |
225 | } | |
226 | ||
227 | void css_update_ssd_info(struct subchannel *sch) | |
228 | { | |
229 | int ret; | |
230 | ||
231 | if (cio_is_console(sch->schid)) { | |
232 | /* Console is initialized too early for functions requiring | |
233 | * memory allocation. */ | |
234 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
235 | } else { | |
236 | ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); | |
237 | if (ret) | |
238 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); | |
239 | ssd_register_chpids(&sch->ssd_info); | |
240 | } | |
241 | } | |
242 | ||
7e9db9ea CH |
243 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
244 | char *buf) | |
245 | { | |
246 | struct subchannel *sch = to_subchannel(dev); | |
247 | ||
248 | return sprintf(buf, "%01x\n", sch->st); | |
249 | } | |
250 | ||
251 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
252 | ||
253 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
254 | char *buf) | |
255 | { | |
256 | struct subchannel *sch = to_subchannel(dev); | |
257 | ||
258 | return sprintf(buf, "css:t%01X\n", sch->st); | |
259 | } | |
260 | ||
261 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); | |
262 | ||
263 | static struct attribute *subch_attrs[] = { | |
264 | &dev_attr_type.attr, | |
265 | &dev_attr_modalias.attr, | |
266 | NULL, | |
267 | }; | |
268 | ||
269 | static struct attribute_group subch_attr_group = { | |
270 | .attrs = subch_attrs, | |
271 | }; | |
272 | ||
a4dbd674 | 273 | static const struct attribute_group *default_subch_attr_groups[] = { |
7e9db9ea CH |
274 | &subch_attr_group, |
275 | NULL, | |
276 | }; | |
277 | ||
7ad6a249 | 278 | static int css_register_subchannel(struct subchannel *sch) |
1da177e4 LT |
279 | { |
280 | int ret; | |
281 | ||
282 | /* Initialize the subchannel structure */ | |
7c9f4e3a | 283 | sch->dev.parent = &channel_subsystems[0]->device; |
1da177e4 LT |
284 | sch->dev.bus = &css_bus_type; |
285 | sch->dev.release = &css_subchannel_release; | |
7e9db9ea | 286 | sch->dev.groups = default_subch_attr_groups; |
5bf04b20 CH |
287 | /* |
288 | * We don't want to generate uevents for I/O subchannels that don't | |
289 | * have a working ccw device behind them since they will be | |
290 | * unregistered before they can be used anyway, so we delay the add | |
291 | * uevent until after device recognition was successful. | |
7e9db9ea CH |
292 | * Note that we suppress the uevent for all subchannel types; |
293 | * the subchannel driver can decide itself when it wants to inform | |
294 | * userspace of its existence. | |
5bf04b20 | 295 | */ |
f67f129e | 296 | dev_set_uevent_suppress(&sch->dev, 1); |
7ad6a249 | 297 | css_update_ssd_info(sch); |
1da177e4 | 298 | /* make it known to the system */ |
6ab4879a | 299 | ret = css_sch_device_register(sch); |
7674da77 | 300 | if (ret) { |
e556bbbd CH |
301 | CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n", |
302 | sch->schid.ssid, sch->schid.sch_no, ret); | |
7674da77 CH |
303 | return ret; |
304 | } | |
7e9db9ea CH |
305 | if (!sch->driver) { |
306 | /* | |
307 | * No driver matched. Generate the uevent now so that | |
308 | * a fitting driver module may be loaded based on the | |
309 | * modalias. | |
310 | */ | |
f67f129e | 311 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea CH |
312 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
313 | } | |
1da177e4 LT |
314 | return ret; |
315 | } | |
316 | ||
c820de39 | 317 | int css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
318 | { |
319 | int ret; | |
320 | struct subchannel *sch; | |
321 | ||
703e5c99 SO |
322 | if (cio_is_console(schid)) |
323 | sch = cio_get_console_subchannel(); | |
324 | else { | |
325 | sch = css_alloc_subchannel(schid); | |
326 | if (IS_ERR(sch)) | |
327 | return PTR_ERR(sch); | |
328 | } | |
1da177e4 | 329 | ret = css_register_subchannel(sch); |
703e5c99 SO |
330 | if (ret) { |
331 | if (!cio_is_console(schid)) | |
332 | put_device(&sch->dev); | |
333 | } | |
1da177e4 LT |
334 | return ret; |
335 | } | |
336 | ||
b0744bd2 CH |
337 | static int |
338 | check_subchannel(struct device * dev, void * data) | |
339 | { | |
340 | struct subchannel *sch; | |
a8237fc4 | 341 | struct subchannel_id *schid = data; |
b0744bd2 CH |
342 | |
343 | sch = to_subchannel(dev); | |
a8237fc4 | 344 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
345 | } |
346 | ||
1da177e4 | 347 | struct subchannel * |
a8237fc4 | 348 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 349 | { |
1da177e4 LT |
350 | struct device *dev; |
351 | ||
b0744bd2 | 352 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 353 | &schid, check_subchannel); |
1da177e4 | 354 | |
b0744bd2 | 355 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
356 | } |
357 | ||
b279a4f5 CH |
358 | /** |
359 | * css_sch_is_valid() - check if a subchannel is valid | |
360 | * @schib: subchannel information block for the subchannel | |
361 | */ | |
362 | int css_sch_is_valid(struct schib *schib) | |
363 | { | |
364 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) | |
365 | return 0; | |
b3a686f4 CH |
366 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) |
367 | return 0; | |
b279a4f5 CH |
368 | return 1; |
369 | } | |
370 | EXPORT_SYMBOL_GPL(css_sch_is_valid); | |
371 | ||
564337f3 PO |
372 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) |
373 | { | |
374 | struct schib schib; | |
375 | ||
376 | if (!slow) { | |
377 | /* Will be done on the slow path. */ | |
378 | return -EAGAIN; | |
379 | } | |
cec85466 SO |
380 | if (stsch_err(schid, &schib)) { |
381 | /* Subchannel is not provided. */ | |
382 | return -ENXIO; | |
383 | } | |
384 | if (!css_sch_is_valid(&schib)) { | |
564337f3 PO |
385 | /* Unusable - ignore. */ |
386 | return 0; | |
1da177e4 | 387 | } |
5d6e6b6f PO |
388 | CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new\n", schid.ssid, |
389 | schid.sch_no); | |
564337f3 PO |
390 | |
391 | return css_probe_device(schid); | |
392 | } | |
393 | ||
c820de39 CH |
394 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) |
395 | { | |
396 | int ret = 0; | |
397 | ||
398 | if (sch->driver) { | |
399 | if (sch->driver->sch_event) | |
400 | ret = sch->driver->sch_event(sch, slow); | |
401 | else | |
402 | dev_dbg(&sch->dev, | |
403 | "Got subchannel machine check but " | |
404 | "no sch_event handler provided.\n"); | |
405 | } | |
5d6e6b6f PO |
406 | if (ret != 0 && ret != -EAGAIN) { |
407 | CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n", | |
408 | sch->schid.ssid, sch->schid.sch_no, ret); | |
409 | } | |
c820de39 CH |
410 | return ret; |
411 | } | |
412 | ||
83b3370c | 413 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
414 | { |
415 | struct subchannel *sch; | |
416 | int ret; | |
417 | ||
418 | sch = get_subchannel_by_schid(schid); | |
419 | if (sch) { | |
420 | ret = css_evaluate_known_subchannel(sch, slow); | |
421 | put_device(&sch->dev); | |
422 | } else | |
423 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
424 | if (ret == -EAGAIN) |
425 | css_schedule_eval(schid); | |
1da177e4 LT |
426 | } |
427 | ||
817e5000 SO |
428 | /** |
429 | * css_sched_sch_todo - schedule a subchannel operation | |
430 | * @sch: subchannel | |
431 | * @todo: todo | |
432 | * | |
433 | * Schedule the operation identified by @todo to be performed on the slow path | |
434 | * workqueue. Do nothing if another operation with higher priority is already | |
435 | * scheduled. Needs to be called with subchannel lock held. | |
436 | */ | |
437 | void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo) | |
438 | { | |
439 | CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d\n", | |
440 | sch->schid.ssid, sch->schid.sch_no, todo); | |
441 | if (sch->todo >= todo) | |
442 | return; | |
443 | /* Get workqueue ref. */ | |
444 | if (!get_device(&sch->dev)) | |
445 | return; | |
446 | sch->todo = todo; | |
447 | if (!queue_work(cio_work_q, &sch->todo_work)) { | |
448 | /* Already queued, release workqueue ref. */ | |
449 | put_device(&sch->dev); | |
450 | } | |
451 | } | |
01c5e6dc | 452 | EXPORT_SYMBOL_GPL(css_sched_sch_todo); |
817e5000 SO |
453 | |
454 | static void css_sch_todo(struct work_struct *work) | |
455 | { | |
456 | struct subchannel *sch; | |
457 | enum sch_todo todo; | |
458 | int ret; | |
459 | ||
460 | sch = container_of(work, struct subchannel, todo_work); | |
461 | /* Find out todo. */ | |
462 | spin_lock_irq(sch->lock); | |
463 | todo = sch->todo; | |
464 | CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid, | |
465 | sch->schid.sch_no, todo); | |
466 | sch->todo = SCH_TODO_NOTHING; | |
467 | spin_unlock_irq(sch->lock); | |
468 | /* Perform todo. */ | |
469 | switch (todo) { | |
470 | case SCH_TODO_NOTHING: | |
471 | break; | |
472 | case SCH_TODO_EVAL: | |
473 | ret = css_evaluate_known_subchannel(sch, 1); | |
474 | if (ret == -EAGAIN) { | |
475 | spin_lock_irq(sch->lock); | |
476 | css_sched_sch_todo(sch, todo); | |
477 | spin_unlock_irq(sch->lock); | |
478 | } | |
479 | break; | |
480 | case SCH_TODO_UNREG: | |
481 | css_sch_device_unregister(sch); | |
482 | break; | |
483 | } | |
484 | /* Release workqueue ref. */ | |
485 | put_device(&sch->dev); | |
486 | } | |
487 | ||
83b3370c PO |
488 | static struct idset *slow_subchannel_set; |
489 | static spinlock_t slow_subchannel_lock; | |
25530553 SO |
490 | static wait_queue_head_t css_eval_wq; |
491 | static atomic_t css_eval_scheduled; | |
83b3370c PO |
492 | |
493 | static int __init slow_subchannel_init(void) | |
1da177e4 | 494 | { |
83b3370c | 495 | spin_lock_init(&slow_subchannel_lock); |
25530553 SO |
496 | atomic_set(&css_eval_scheduled, 0); |
497 | init_waitqueue_head(&css_eval_wq); | |
83b3370c PO |
498 | slow_subchannel_set = idset_sch_new(); |
499 | if (!slow_subchannel_set) { | |
e556bbbd | 500 | CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); |
83b3370c PO |
501 | return -ENOMEM; |
502 | } | |
503 | return 0; | |
1da177e4 LT |
504 | } |
505 | ||
e82a1567 | 506 | static int slow_eval_known_fn(struct subchannel *sch, void *data) |
1da177e4 | 507 | { |
e82a1567 PO |
508 | int eval; |
509 | int rc; | |
1da177e4 LT |
510 | |
511 | spin_lock_irq(&slow_subchannel_lock); | |
e82a1567 PO |
512 | eval = idset_sch_contains(slow_subchannel_set, sch->schid); |
513 | idset_sch_del(slow_subchannel_set, sch->schid); | |
514 | spin_unlock_irq(&slow_subchannel_lock); | |
515 | if (eval) { | |
516 | rc = css_evaluate_known_subchannel(sch, 1); | |
517 | if (rc == -EAGAIN) | |
518 | css_schedule_eval(sch->schid); | |
1da177e4 | 519 | } |
e82a1567 PO |
520 | return 0; |
521 | } | |
522 | ||
523 | static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) | |
524 | { | |
525 | int eval; | |
526 | int rc = 0; | |
527 | ||
528 | spin_lock_irq(&slow_subchannel_lock); | |
529 | eval = idset_sch_contains(slow_subchannel_set, schid); | |
530 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 531 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
532 | if (eval) { |
533 | rc = css_evaluate_new_subchannel(schid, 1); | |
534 | switch (rc) { | |
535 | case -EAGAIN: | |
536 | css_schedule_eval(schid); | |
537 | rc = 0; | |
538 | break; | |
539 | case -ENXIO: | |
540 | case -ENOMEM: | |
541 | case -EIO: | |
542 | /* These should abort looping */ | |
cec85466 | 543 | idset_sch_del_subseq(slow_subchannel_set, schid); |
e82a1567 PO |
544 | break; |
545 | default: | |
546 | rc = 0; | |
547 | } | |
548 | } | |
549 | return rc; | |
550 | } | |
551 | ||
552 | static void css_slow_path_func(struct work_struct *unused) | |
553 | { | |
25530553 SO |
554 | unsigned long flags; |
555 | ||
e82a1567 PO |
556 | CIO_TRACE_EVENT(4, "slowpath"); |
557 | for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, | |
558 | NULL); | |
25530553 SO |
559 | spin_lock_irqsave(&slow_subchannel_lock, flags); |
560 | if (idset_is_empty(slow_subchannel_set)) { | |
561 | atomic_set(&css_eval_scheduled, 0); | |
562 | wake_up(&css_eval_wq); | |
563 | } | |
564 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
1da177e4 LT |
565 | } |
566 | ||
83b3370c | 567 | static DECLARE_WORK(slow_path_work, css_slow_path_func); |
be5d3823 | 568 | struct workqueue_struct *cio_work_q; |
1da177e4 | 569 | |
83b3370c PO |
570 | void css_schedule_eval(struct subchannel_id schid) |
571 | { | |
572 | unsigned long flags; | |
573 | ||
574 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
575 | idset_sch_add(slow_subchannel_set, schid); | |
25530553 | 576 | atomic_set(&css_eval_scheduled, 1); |
be5d3823 | 577 | queue_work(cio_work_q, &slow_path_work); |
83b3370c PO |
578 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
579 | } | |
580 | ||
581 | void css_schedule_eval_all(void) | |
582 | { | |
583 | unsigned long flags; | |
584 | ||
585 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
586 | idset_fill(slow_subchannel_set); | |
25530553 | 587 | atomic_set(&css_eval_scheduled, 1); |
be5d3823 | 588 | queue_work(cio_work_q, &slow_path_work); |
83b3370c PO |
589 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
590 | } | |
591 | ||
703e5c99 | 592 | static int __unset_registered(struct device *dev, void *data) |
22806dc1 | 593 | { |
703e5c99 SO |
594 | struct idset *set = data; |
595 | struct subchannel *sch = to_subchannel(dev); | |
40154b82 | 596 | |
703e5c99 SO |
597 | idset_sch_del(set, sch->schid); |
598 | return 0; | |
56e25e97 PO |
599 | } |
600 | ||
a8481c2a | 601 | static void css_schedule_eval_all_unreg(void) |
40154b82 | 602 | { |
703e5c99 SO |
603 | unsigned long flags; |
604 | struct idset *unreg_set; | |
40154b82 | 605 | |
703e5c99 SO |
606 | /* Find unregistered subchannels. */ |
607 | unreg_set = idset_sch_new(); | |
608 | if (!unreg_set) { | |
609 | /* Fallback. */ | |
610 | css_schedule_eval_all(); | |
56e25e97 PO |
611 | return; |
612 | } | |
703e5c99 SO |
613 | idset_fill(unreg_set); |
614 | bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered); | |
615 | /* Apply to slow_subchannel_set. */ | |
616 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
617 | idset_add_set(slow_subchannel_set, unreg_set); | |
618 | atomic_set(&css_eval_scheduled, 1); | |
be5d3823 | 619 | queue_work(cio_work_q, &slow_path_work); |
703e5c99 SO |
620 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
621 | idset_free(unreg_set); | |
40154b82 PO |
622 | } |
623 | ||
703e5c99 SO |
624 | void css_wait_for_slow_path(void) |
625 | { | |
be5d3823 | 626 | flush_workqueue(cio_work_q); |
703e5c99 | 627 | } |
40154b82 PO |
628 | |
629 | /* Schedule reprobing of all unregistered subchannels. */ | |
630 | void css_schedule_reprobe(void) | |
631 | { | |
703e5c99 | 632 | css_schedule_eval_all_unreg(); |
40154b82 | 633 | } |
40154b82 PO |
634 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); |
635 | ||
1da177e4 LT |
636 | /* |
637 | * Called from the machine check handler for subchannel report words. | |
638 | */ | |
c1156189 | 639 | static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
1da177e4 | 640 | { |
a8237fc4 | 641 | struct subchannel_id mchk_schid; |
4bc4e965 | 642 | struct subchannel *sch; |
1da177e4 | 643 | |
c1156189 CH |
644 | if (overflow) { |
645 | css_schedule_eval_all(); | |
646 | return; | |
647 | } | |
648 | CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " | |
649 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
650 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
651 | crw0->erc, crw0->rsid); | |
652 | if (crw1) | |
653 | CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " | |
654 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
655 | crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, | |
656 | crw1->anc, crw1->erc, crw1->rsid); | |
a8237fc4 | 657 | init_subchannel_id(&mchk_schid); |
c1156189 CH |
658 | mchk_schid.sch_no = crw0->rsid; |
659 | if (crw1) | |
8d7bfb4a | 660 | mchk_schid.ssid = (crw1->rsid >> 4) & 3; |
fb6958a5 | 661 | |
4bc4e965 SO |
662 | if (crw0->erc == CRW_ERC_PMOD) { |
663 | sch = get_subchannel_by_schid(mchk_schid); | |
664 | if (sch) { | |
665 | css_update_ssd_info(sch); | |
666 | put_device(&sch->dev); | |
667 | } | |
668 | } | |
c1156189 | 669 | /* |
1da177e4 LT |
670 | * Since we are always presented with IPI in the CRW, we have to |
671 | * use stsch() to find out if the subchannel in question has come | |
672 | * or gone. | |
673 | */ | |
83b3370c | 674 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
675 | } |
676 | ||
677 | static void __init | |
a28c6944 | 678 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 679 | { |
94038a99 MS |
680 | struct cpuid cpu_id; |
681 | ||
75784c00 | 682 | if (css_general_characteristics.mcss) { |
a28c6944 CH |
683 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
684 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
685 | } else { | |
1da177e4 | 686 | #ifdef CONFIG_SMP |
7b468488 | 687 | css->global_pgid.pgid_high.cpu_addr = stap(); |
1da177e4 | 688 | #else |
a28c6944 | 689 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
690 | #endif |
691 | } | |
94038a99 MS |
692 | get_cpu_id(&cpu_id); |
693 | css->global_pgid.cpu_id = cpu_id.ident; | |
694 | css->global_pgid.cpu_model = cpu_id.machine; | |
a28c6944 CH |
695 | css->global_pgid.tod_high = tod_high; |
696 | ||
697 | } | |
698 | ||
3b793060 CH |
699 | static void |
700 | channel_subsystem_release(struct device *dev) | |
701 | { | |
702 | struct channel_subsystem *css; | |
703 | ||
704 | css = to_css(dev); | |
495a5b45 | 705 | mutex_destroy(&css->mutex); |
a2164b81 CH |
706 | if (css->pseudo_subchannel) { |
707 | /* Implies that it has been generated but never registered. */ | |
708 | css_subchannel_release(&css->pseudo_subchannel->dev); | |
709 | css->pseudo_subchannel = NULL; | |
710 | } | |
3b793060 CH |
711 | kfree(css); |
712 | } | |
713 | ||
495a5b45 CH |
714 | static ssize_t |
715 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
716 | char *buf) | |
717 | { | |
718 | struct channel_subsystem *css = to_css(dev); | |
8284fb19 | 719 | int ret; |
495a5b45 CH |
720 | |
721 | if (!css) | |
722 | return 0; | |
8284fb19 ME |
723 | mutex_lock(&css->mutex); |
724 | ret = sprintf(buf, "%x\n", css->cm_enabled); | |
725 | mutex_unlock(&css->mutex); | |
726 | return ret; | |
495a5b45 CH |
727 | } |
728 | ||
729 | static ssize_t | |
730 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
731 | const char *buf, size_t count) | |
732 | { | |
733 | struct channel_subsystem *css = to_css(dev); | |
734 | int ret; | |
2f972202 | 735 | unsigned long val; |
495a5b45 | 736 | |
2f972202 CH |
737 | ret = strict_strtoul(buf, 16, &val); |
738 | if (ret) | |
739 | return ret; | |
8284fb19 | 740 | mutex_lock(&css->mutex); |
2f972202 CH |
741 | switch (val) { |
742 | case 0: | |
495a5b45 CH |
743 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; |
744 | break; | |
2f972202 | 745 | case 1: |
495a5b45 CH |
746 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); |
747 | break; | |
748 | default: | |
749 | ret = -EINVAL; | |
750 | } | |
8284fb19 | 751 | mutex_unlock(&css->mutex); |
495a5b45 CH |
752 | return ret < 0 ? ret : count; |
753 | } | |
754 | ||
755 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
756 | ||
4d284cac | 757 | static int __init setup_css(int nr) |
a28c6944 CH |
758 | { |
759 | u32 tod_high; | |
d7b5a4c9 | 760 | int ret; |
7c9f4e3a | 761 | struct channel_subsystem *css; |
a28c6944 | 762 | |
7c9f4e3a CH |
763 | css = channel_subsystems[nr]; |
764 | memset(css, 0, sizeof(struct channel_subsystem)); | |
765 | css->pseudo_subchannel = | |
766 | kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL); | |
767 | if (!css->pseudo_subchannel) | |
d7b5a4c9 | 768 | return -ENOMEM; |
7c9f4e3a CH |
769 | css->pseudo_subchannel->dev.parent = &css->device; |
770 | css->pseudo_subchannel->dev.release = css_subchannel_release; | |
1bf5b285 | 771 | dev_set_name(&css->pseudo_subchannel->dev, "defunct"); |
5d6e6b6f | 772 | mutex_init(&css->pseudo_subchannel->reg_mutex); |
7c9f4e3a | 773 | ret = cio_create_sch_lock(css->pseudo_subchannel); |
d7b5a4c9 | 774 | if (ret) { |
7c9f4e3a | 775 | kfree(css->pseudo_subchannel); |
d7b5a4c9 CH |
776 | return ret; |
777 | } | |
7c9f4e3a CH |
778 | mutex_init(&css->mutex); |
779 | css->valid = 1; | |
780 | css->cssid = nr; | |
1bf5b285 | 781 | dev_set_name(&css->device, "css%x", nr); |
7c9f4e3a | 782 | css->device.release = channel_subsystem_release; |
1aae0560 | 783 | tod_high = (u32) (get_tod_clock() >> 32); |
7c9f4e3a | 784 | css_generate_pgid(css, tod_high); |
d7b5a4c9 | 785 | return 0; |
1da177e4 LT |
786 | } |
787 | ||
a55360df CH |
788 | static int css_reboot_event(struct notifier_block *this, |
789 | unsigned long event, | |
790 | void *ptr) | |
791 | { | |
792 | int ret, i; | |
793 | ||
794 | ret = NOTIFY_DONE; | |
795 | for (i = 0; i <= __MAX_CSSID; i++) { | |
796 | struct channel_subsystem *css; | |
797 | ||
798 | css = channel_subsystems[i]; | |
8284fb19 | 799 | mutex_lock(&css->mutex); |
a55360df CH |
800 | if (css->cm_enabled) |
801 | if (chsc_secm(css, 0)) | |
802 | ret = NOTIFY_BAD; | |
8284fb19 | 803 | mutex_unlock(&css->mutex); |
a55360df CH |
804 | } |
805 | ||
806 | return ret; | |
807 | } | |
808 | ||
809 | static struct notifier_block css_reboot_notifier = { | |
810 | .notifier_call = css_reboot_event, | |
811 | }; | |
812 | ||
dcbd16d5 SO |
813 | /* |
814 | * Since the css devices are neither on a bus nor have a class | |
815 | * nor have a special device type, we cannot stop/restart channel | |
816 | * path measurements via the normal suspend/resume callbacks, but have | |
817 | * to use notifiers. | |
818 | */ | |
819 | static int css_power_event(struct notifier_block *this, unsigned long event, | |
820 | void *ptr) | |
821 | { | |
dcbd16d5 SO |
822 | int ret, i; |
823 | ||
824 | switch (event) { | |
825 | case PM_HIBERNATION_PREPARE: | |
826 | case PM_SUSPEND_PREPARE: | |
827 | ret = NOTIFY_DONE; | |
828 | for (i = 0; i <= __MAX_CSSID; i++) { | |
829 | struct channel_subsystem *css; | |
830 | ||
831 | css = channel_subsystems[i]; | |
832 | mutex_lock(&css->mutex); | |
833 | if (!css->cm_enabled) { | |
834 | mutex_unlock(&css->mutex); | |
835 | continue; | |
836 | } | |
f0c077a8 AM |
837 | ret = __chsc_do_secm(css, 0); |
838 | ret = notifier_from_errno(ret); | |
dcbd16d5 SO |
839 | mutex_unlock(&css->mutex); |
840 | } | |
841 | break; | |
842 | case PM_POST_HIBERNATION: | |
843 | case PM_POST_SUSPEND: | |
844 | ret = NOTIFY_DONE; | |
845 | for (i = 0; i <= __MAX_CSSID; i++) { | |
846 | struct channel_subsystem *css; | |
847 | ||
848 | css = channel_subsystems[i]; | |
849 | mutex_lock(&css->mutex); | |
850 | if (!css->cm_enabled) { | |
851 | mutex_unlock(&css->mutex); | |
852 | continue; | |
853 | } | |
f0c077a8 AM |
854 | ret = __chsc_do_secm(css, 1); |
855 | ret = notifier_from_errno(ret); | |
dcbd16d5 SO |
856 | mutex_unlock(&css->mutex); |
857 | } | |
858 | /* search for subchannels, which appeared during hibernation */ | |
859 | css_schedule_reprobe(); | |
860 | break; | |
861 | default: | |
862 | ret = NOTIFY_DONE; | |
863 | } | |
864 | return ret; | |
865 | ||
866 | } | |
867 | static struct notifier_block css_power_notifier = { | |
868 | .notifier_call = css_power_event, | |
869 | }; | |
870 | ||
1da177e4 LT |
871 | /* |
872 | * Now that the driver core is running, we can setup our channel subsystem. | |
873 | * The struct subchannel's are created during probing (except for the | |
874 | * static console subchannel). | |
875 | */ | |
2f17644d | 876 | static int __init css_bus_init(void) |
1da177e4 | 877 | { |
a28c6944 | 878 | int ret, i; |
1da177e4 | 879 | |
34aec07c SO |
880 | ret = chsc_init(); |
881 | if (ret) | |
882 | return ret; | |
883 | ||
34196f82 | 884 | chsc_determine_css_characteristics(); |
b0a285d3 SO |
885 | /* Try to enable MSS. */ |
886 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
818c272b | 887 | if (ret) |
b0a285d3 | 888 | max_ssid = 0; |
818c272b SO |
889 | else /* Success. */ |
890 | max_ssid = __MAX_SSID; | |
b0a285d3 | 891 | |
4434a38c CH |
892 | ret = slow_subchannel_init(); |
893 | if (ret) | |
894 | goto out; | |
895 | ||
f5daba1d | 896 | ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); |
c1156189 CH |
897 | if (ret) |
898 | goto out; | |
899 | ||
1da177e4 LT |
900 | if ((ret = bus_register(&css_bus_type))) |
901 | goto out; | |
1da177e4 | 902 | |
a28c6944 CH |
903 | /* Setup css structure. */ |
904 | for (i = 0; i <= __MAX_CSSID; i++) { | |
7c9f4e3a CH |
905 | struct channel_subsystem *css; |
906 | ||
907 | css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
908 | if (!css) { | |
a28c6944 | 909 | ret = -ENOMEM; |
fb6958a5 | 910 | goto out_unregister; |
a28c6944 | 911 | } |
7c9f4e3a | 912 | channel_subsystems[i] = css; |
d7b5a4c9 | 913 | ret = setup_css(i); |
a2164b81 CH |
914 | if (ret) { |
915 | kfree(channel_subsystems[i]); | |
916 | goto out_unregister; | |
917 | } | |
7c9f4e3a | 918 | ret = device_register(&css->device); |
a2164b81 CH |
919 | if (ret) { |
920 | put_device(&css->device); | |
921 | goto out_unregister; | |
922 | } | |
75784c00 | 923 | if (css_chsc_characteristics.secm) { |
7c9f4e3a | 924 | ret = device_create_file(&css->device, |
7e560814 CH |
925 | &dev_attr_cm_enable); |
926 | if (ret) | |
927 | goto out_device; | |
928 | } | |
7c9f4e3a | 929 | ret = device_register(&css->pseudo_subchannel->dev); |
c6304933 SO |
930 | if (ret) { |
931 | put_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 | 932 | goto out_file; |
c6304933 | 933 | } |
a28c6944 | 934 | } |
a55360df CH |
935 | ret = register_reboot_notifier(&css_reboot_notifier); |
936 | if (ret) | |
a2164b81 | 937 | goto out_unregister; |
dcbd16d5 SO |
938 | ret = register_pm_notifier(&css_power_notifier); |
939 | if (ret) { | |
940 | unregister_reboot_notifier(&css_reboot_notifier); | |
941 | goto out_unregister; | |
942 | } | |
1da177e4 LT |
943 | css_init_done = 1; |
944 | ||
3a3fc29a | 945 | /* Enable default isc for I/O subchannels. */ |
6ef556cc | 946 | isc_register(IO_SCH_ISC); |
1da177e4 | 947 | |
1da177e4 | 948 | return 0; |
d7b5a4c9 | 949 | out_file: |
a2164b81 CH |
950 | if (css_chsc_characteristics.secm) |
951 | device_remove_file(&channel_subsystems[i]->device, | |
952 | &dev_attr_cm_enable); | |
7e560814 | 953 | out_device: |
7c9f4e3a | 954 | device_unregister(&channel_subsystems[i]->device); |
fb6958a5 | 955 | out_unregister: |
a28c6944 | 956 | while (i > 0) { |
7c9f4e3a CH |
957 | struct channel_subsystem *css; |
958 | ||
a28c6944 | 959 | i--; |
7c9f4e3a CH |
960 | css = channel_subsystems[i]; |
961 | device_unregister(&css->pseudo_subchannel->dev); | |
a2164b81 | 962 | css->pseudo_subchannel = NULL; |
75784c00 | 963 | if (css_chsc_characteristics.secm) |
7c9f4e3a | 964 | device_remove_file(&css->device, |
495a5b45 | 965 | &dev_attr_cm_enable); |
7c9f4e3a | 966 | device_unregister(&css->device); |
a28c6944 | 967 | } |
1da177e4 LT |
968 | bus_unregister(&css_bus_type); |
969 | out: | |
34aec07c | 970 | crw_unregister_handler(CRW_RSC_SCH); |
b827d1c8 | 971 | idset_free(slow_subchannel_set); |
34aec07c | 972 | chsc_init_cleanup(); |
e6d5a428 ME |
973 | pr_alert("The CSS device driver initialization failed with " |
974 | "errno=%d\n", ret); | |
1da177e4 LT |
975 | return ret; |
976 | } | |
977 | ||
2f17644d SO |
978 | static void __init css_bus_cleanup(void) |
979 | { | |
980 | struct channel_subsystem *css; | |
981 | int i; | |
982 | ||
983 | for (i = 0; i <= __MAX_CSSID; i++) { | |
984 | css = channel_subsystems[i]; | |
985 | device_unregister(&css->pseudo_subchannel->dev); | |
986 | css->pseudo_subchannel = NULL; | |
987 | if (css_chsc_characteristics.secm) | |
988 | device_remove_file(&css->device, &dev_attr_cm_enable); | |
989 | device_unregister(&css->device); | |
990 | } | |
991 | bus_unregister(&css_bus_type); | |
34aec07c | 992 | crw_unregister_handler(CRW_RSC_SCH); |
b827d1c8 | 993 | idset_free(slow_subchannel_set); |
34aec07c | 994 | chsc_init_cleanup(); |
2f17644d SO |
995 | isc_unregister(IO_SCH_ISC); |
996 | } | |
997 | ||
998 | static int __init channel_subsystem_init(void) | |
999 | { | |
1000 | int ret; | |
1001 | ||
1002 | ret = css_bus_init(); | |
1003 | if (ret) | |
1004 | return ret; | |
be5d3823 SO |
1005 | cio_work_q = create_singlethread_workqueue("cio"); |
1006 | if (!cio_work_q) { | |
1007 | ret = -ENOMEM; | |
1008 | goto out_bus; | |
1009 | } | |
2f17644d SO |
1010 | ret = io_subchannel_init(); |
1011 | if (ret) | |
be5d3823 | 1012 | goto out_wq; |
2f17644d SO |
1013 | |
1014 | return ret; | |
be5d3823 SO |
1015 | out_wq: |
1016 | destroy_workqueue(cio_work_q); | |
1017 | out_bus: | |
1018 | css_bus_cleanup(); | |
1019 | return ret; | |
2f17644d SO |
1020 | } |
1021 | subsys_initcall(channel_subsystem_init); | |
1022 | ||
8ea7f559 SO |
1023 | static int css_settle(struct device_driver *drv, void *unused) |
1024 | { | |
1025 | struct css_driver *cssdrv = to_cssdriver(drv); | |
1026 | ||
1027 | if (cssdrv->settle) | |
b4c70721 | 1028 | return cssdrv->settle(); |
8ea7f559 SO |
1029 | return 0; |
1030 | } | |
1031 | ||
0d01bb89 | 1032 | int css_complete_work(void) |
879acca5 SO |
1033 | { |
1034 | int ret; | |
1035 | ||
1036 | /* Wait for the evaluation of subchannels to finish. */ | |
b4c70721 SO |
1037 | ret = wait_event_interruptible(css_eval_wq, |
1038 | atomic_read(&css_eval_scheduled) == 0); | |
1039 | if (ret) | |
1040 | return -EINTR; | |
879acca5 SO |
1041 | flush_workqueue(cio_work_q); |
1042 | /* Wait for the subchannel type specific initialization to finish */ | |
b4c70721 | 1043 | return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle); |
879acca5 SO |
1044 | } |
1045 | ||
1046 | ||
2f17644d SO |
1047 | /* |
1048 | * Wait for the initialization of devices to finish, to make sure we are | |
1049 | * done with our setup if the search for the root device starts. | |
1050 | */ | |
1051 | static int __init channel_subsystem_init_sync(void) | |
1052 | { | |
703e5c99 SO |
1053 | /* Start initial subchannel evaluation. */ |
1054 | css_schedule_eval_all(); | |
879acca5 SO |
1055 | css_complete_work(); |
1056 | return 0; | |
2f17644d SO |
1057 | } |
1058 | subsys_initcall_sync(channel_subsystem_init_sync); | |
1059 | ||
889ee955 SO |
1060 | void channel_subsystem_reinit(void) |
1061 | { | |
62da177a SO |
1062 | struct channel_path *chp; |
1063 | struct chp_id chpid; | |
1064 | ||
889ee955 | 1065 | chsc_enable_facility(CHSC_SDA_OC_MSS); |
62da177a SO |
1066 | chp_id_for_each(&chpid) { |
1067 | chp = chpid_to_chp(chpid); | |
1068 | if (!chp) | |
1069 | continue; | |
1070 | chsc_determine_base_channel_path_desc(chpid, &chp->desc); | |
1071 | } | |
889ee955 SO |
1072 | } |
1073 | ||
879acca5 SO |
1074 | #ifdef CONFIG_PROC_FS |
1075 | static ssize_t cio_settle_write(struct file *file, const char __user *buf, | |
1076 | size_t count, loff_t *ppos) | |
1077 | { | |
b4c70721 SO |
1078 | int ret; |
1079 | ||
879acca5 SO |
1080 | /* Handle pending CRW's. */ |
1081 | crw_wait_for_channel_report(); | |
b4c70721 SO |
1082 | ret = css_complete_work(); |
1083 | ||
1084 | return ret ? ret : count; | |
879acca5 SO |
1085 | } |
1086 | ||
1087 | static const struct file_operations cio_settle_proc_fops = { | |
58ea91c0 | 1088 | .open = nonseekable_open, |
879acca5 | 1089 | .write = cio_settle_write, |
6038f373 | 1090 | .llseek = no_llseek, |
879acca5 SO |
1091 | }; |
1092 | ||
1093 | static int __init cio_settle_init(void) | |
1094 | { | |
1095 | struct proc_dir_entry *entry; | |
1096 | ||
1097 | entry = proc_create("cio_settle", S_IWUSR, NULL, | |
1098 | &cio_settle_proc_fops); | |
1099 | if (!entry) | |
1100 | return -ENOMEM; | |
1101 | return 0; | |
1102 | } | |
1103 | device_initcall(cio_settle_init); | |
1104 | #endif /*CONFIG_PROC_FS*/ | |
1105 | ||
d7b5a4c9 CH |
1106 | int sch_is_pseudo_sch(struct subchannel *sch) |
1107 | { | |
1108 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
1109 | } | |
1110 | ||
f08adc00 | 1111 | static int css_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1112 | { |
084325d8 CH |
1113 | struct subchannel *sch = to_subchannel(dev); |
1114 | struct css_driver *driver = to_cssdriver(drv); | |
f08adc00 | 1115 | struct css_device_id *id; |
1da177e4 | 1116 | |
f08adc00 CH |
1117 | for (id = driver->subchannel_type; id->match_flags; id++) { |
1118 | if (sch->st == id->type) | |
1119 | return 1; | |
1120 | } | |
1da177e4 LT |
1121 | |
1122 | return 0; | |
1123 | } | |
1124 | ||
98c13c28 | 1125 | static int css_probe(struct device *dev) |
8bbace7e CH |
1126 | { |
1127 | struct subchannel *sch; | |
98c13c28 | 1128 | int ret; |
8bbace7e CH |
1129 | |
1130 | sch = to_subchannel(dev); | |
084325d8 | 1131 | sch->driver = to_cssdriver(dev->driver); |
98c13c28 CH |
1132 | ret = sch->driver->probe ? sch->driver->probe(sch) : 0; |
1133 | if (ret) | |
1134 | sch->driver = NULL; | |
1135 | return ret; | |
8bbace7e CH |
1136 | } |
1137 | ||
98c13c28 | 1138 | static int css_remove(struct device *dev) |
8bbace7e CH |
1139 | { |
1140 | struct subchannel *sch; | |
98c13c28 | 1141 | int ret; |
8bbace7e CH |
1142 | |
1143 | sch = to_subchannel(dev); | |
98c13c28 CH |
1144 | ret = sch->driver->remove ? sch->driver->remove(sch) : 0; |
1145 | sch->driver = NULL; | |
1146 | return ret; | |
8bbace7e CH |
1147 | } |
1148 | ||
98c13c28 | 1149 | static void css_shutdown(struct device *dev) |
8bbace7e CH |
1150 | { |
1151 | struct subchannel *sch; | |
1152 | ||
1153 | sch = to_subchannel(dev); | |
98c13c28 | 1154 | if (sch->driver && sch->driver->shutdown) |
8bbace7e CH |
1155 | sch->driver->shutdown(sch); |
1156 | } | |
1157 | ||
7e9db9ea CH |
1158 | static int css_uevent(struct device *dev, struct kobj_uevent_env *env) |
1159 | { | |
1160 | struct subchannel *sch = to_subchannel(dev); | |
1161 | int ret; | |
1162 | ||
1163 | ret = add_uevent_var(env, "ST=%01X", sch->st); | |
1164 | if (ret) | |
1165 | return ret; | |
1166 | ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); | |
1167 | return ret; | |
1168 | } | |
1169 | ||
dcbd16d5 SO |
1170 | static int css_pm_prepare(struct device *dev) |
1171 | { | |
1172 | struct subchannel *sch = to_subchannel(dev); | |
1173 | struct css_driver *drv; | |
1174 | ||
1175 | if (mutex_is_locked(&sch->reg_mutex)) | |
1176 | return -EAGAIN; | |
1177 | if (!sch->dev.driver) | |
1178 | return 0; | |
1179 | drv = to_cssdriver(sch->dev.driver); | |
1180 | /* Notify drivers that they may not register children. */ | |
1181 | return drv->prepare ? drv->prepare(sch) : 0; | |
1182 | } | |
1183 | ||
1184 | static void css_pm_complete(struct device *dev) | |
1185 | { | |
1186 | struct subchannel *sch = to_subchannel(dev); | |
1187 | struct css_driver *drv; | |
1188 | ||
1189 | if (!sch->dev.driver) | |
1190 | return; | |
1191 | drv = to_cssdriver(sch->dev.driver); | |
1192 | if (drv->complete) | |
1193 | drv->complete(sch); | |
1194 | } | |
1195 | ||
1196 | static int css_pm_freeze(struct device *dev) | |
1197 | { | |
1198 | struct subchannel *sch = to_subchannel(dev); | |
1199 | struct css_driver *drv; | |
1200 | ||
1201 | if (!sch->dev.driver) | |
1202 | return 0; | |
1203 | drv = to_cssdriver(sch->dev.driver); | |
1204 | return drv->freeze ? drv->freeze(sch) : 0; | |
1205 | } | |
1206 | ||
1207 | static int css_pm_thaw(struct device *dev) | |
1208 | { | |
1209 | struct subchannel *sch = to_subchannel(dev); | |
1210 | struct css_driver *drv; | |
1211 | ||
1212 | if (!sch->dev.driver) | |
1213 | return 0; | |
1214 | drv = to_cssdriver(sch->dev.driver); | |
1215 | return drv->thaw ? drv->thaw(sch) : 0; | |
1216 | } | |
1217 | ||
1218 | static int css_pm_restore(struct device *dev) | |
1219 | { | |
1220 | struct subchannel *sch = to_subchannel(dev); | |
1221 | struct css_driver *drv; | |
1222 | ||
eb4f5d93 | 1223 | css_update_ssd_info(sch); |
dcbd16d5 SO |
1224 | if (!sch->dev.driver) |
1225 | return 0; | |
1226 | drv = to_cssdriver(sch->dev.driver); | |
1227 | return drv->restore ? drv->restore(sch) : 0; | |
1228 | } | |
1229 | ||
47145210 | 1230 | static const struct dev_pm_ops css_pm_ops = { |
dcbd16d5 SO |
1231 | .prepare = css_pm_prepare, |
1232 | .complete = css_pm_complete, | |
1233 | .freeze = css_pm_freeze, | |
1234 | .thaw = css_pm_thaw, | |
1235 | .restore = css_pm_restore, | |
1236 | }; | |
1237 | ||
3041b6ab | 1238 | static struct bus_type css_bus_type = { |
8bbace7e CH |
1239 | .name = "css", |
1240 | .match = css_bus_match, | |
1241 | .probe = css_probe, | |
1242 | .remove = css_remove, | |
1243 | .shutdown = css_shutdown, | |
7e9db9ea | 1244 | .uevent = css_uevent, |
dcbd16d5 | 1245 | .pm = &css_pm_ops, |
1da177e4 LT |
1246 | }; |
1247 | ||
25b7bb58 CH |
1248 | /** |
1249 | * css_driver_register - register a css driver | |
1250 | * @cdrv: css driver to register | |
1251 | * | |
1252 | * This is mainly a wrapper around driver_register that sets name | |
1253 | * and bus_type in the embedded struct device_driver correctly. | |
1254 | */ | |
1255 | int css_driver_register(struct css_driver *cdrv) | |
1256 | { | |
25b7bb58 CH |
1257 | cdrv->drv.bus = &css_bus_type; |
1258 | return driver_register(&cdrv->drv); | |
1259 | } | |
1260 | EXPORT_SYMBOL_GPL(css_driver_register); | |
1261 | ||
1262 | /** | |
1263 | * css_driver_unregister - unregister a css driver | |
1264 | * @cdrv: css driver to unregister | |
1265 | * | |
1266 | * This is a wrapper around driver_unregister. | |
1267 | */ | |
1268 | void css_driver_unregister(struct css_driver *cdrv) | |
1269 | { | |
1270 | driver_unregister(&cdrv->drv); | |
1271 | } | |
1272 | EXPORT_SYMBOL_GPL(css_driver_unregister); | |
1273 | ||
1da177e4 | 1274 | MODULE_LICENSE("GPL"); |