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); | |
f97a56fb | 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 | ||
47d30674 PO |
71 | if (cb->set) |
72 | idset_sch_del(cb->set, sch->schid); | |
e82a1567 PO |
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 | 117 | |
47d30674 PO |
118 | if (fn_known && !fn_unknown) { |
119 | /* Skip idset allocation in case of known-only loop. */ | |
120 | cb.set = NULL; | |
121 | return bus_for_each_dev(&css_bus_type, NULL, &cb, | |
122 | call_fn_known_sch); | |
123 | } | |
124 | ||
90ac24a5 SO |
125 | cb.set = idset_sch_new(); |
126 | if (!cb.set) | |
127 | /* fall back to brute force scanning in case of oom */ | |
128 | return for_each_subchannel(call_fn_all_sch, &cb); | |
129 | ||
130 | idset_fill(cb.set); | |
131 | ||
e82a1567 PO |
132 | /* Process registered subchannels. */ |
133 | rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); | |
134 | if (rc) | |
135 | goto out; | |
136 | /* Process unregistered subchannels. */ | |
137 | if (fn_unknown) | |
138 | rc = for_each_subchannel(call_fn_unknown_sch, &cb); | |
139 | out: | |
140 | idset_free(cb.set); | |
141 | ||
142 | return rc; | |
143 | } | |
144 | ||
390935ac PO |
145 | static void css_sch_todo(struct work_struct *work); |
146 | ||
e5dcf002 SO |
147 | static int css_sch_create_locks(struct subchannel *sch) |
148 | { | |
149 | sch->lock = kmalloc(sizeof(*sch->lock), GFP_KERNEL); | |
150 | if (!sch->lock) | |
151 | return -ENOMEM; | |
152 | ||
153 | spin_lock_init(sch->lock); | |
154 | mutex_init(&sch->reg_mutex); | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
c135ad1c SO |
159 | static void css_subchannel_release(struct device *dev) |
160 | { | |
863fc849 | 161 | struct subchannel *sch = to_subchannel(dev); |
c135ad1c | 162 | |
863fc849 SO |
163 | sch->config.intparm = 0; |
164 | cio_commit_config(sch); | |
165 | kfree(sch->lock); | |
166 | kfree(sch); | |
c135ad1c SO |
167 | } |
168 | ||
863fc849 | 169 | struct subchannel *css_alloc_subchannel(struct subchannel_id schid) |
1da177e4 LT |
170 | { |
171 | struct subchannel *sch; | |
172 | int ret; | |
173 | ||
e5dcf002 SO |
174 | sch = kzalloc(sizeof(*sch), GFP_KERNEL | GFP_DMA); |
175 | if (!sch) | |
1da177e4 | 176 | return ERR_PTR(-ENOMEM); |
e5dcf002 SO |
177 | |
178 | ret = cio_validate_subchannel(sch, schid); | |
179 | if (ret < 0) | |
180 | goto err; | |
181 | ||
182 | ret = css_sch_create_locks(sch); | |
183 | if (ret) | |
184 | goto err; | |
185 | ||
390935ac | 186 | INIT_WORK(&sch->todo_work, css_sch_todo); |
c135ad1c SO |
187 | sch->dev.release = &css_subchannel_release; |
188 | device_initialize(&sch->dev); | |
1da177e4 | 189 | return sch; |
e5dcf002 SO |
190 | |
191 | err: | |
192 | kfree(sch); | |
193 | return ERR_PTR(ret); | |
1da177e4 LT |
194 | } |
195 | ||
07c6a338 | 196 | static int css_sch_device_register(struct subchannel *sch) |
6ab4879a CH |
197 | { |
198 | int ret; | |
199 | ||
200 | mutex_lock(&sch->reg_mutex); | |
6ee4fec6 SO |
201 | dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, |
202 | sch->schid.sch_no); | |
c135ad1c | 203 | ret = device_add(&sch->dev); |
6ab4879a CH |
204 | mutex_unlock(&sch->reg_mutex); |
205 | return ret; | |
206 | } | |
207 | ||
44a1c19e CH |
208 | /** |
209 | * css_sch_device_unregister - unregister a subchannel | |
210 | * @sch: subchannel to be unregistered | |
211 | */ | |
6ab4879a CH |
212 | void css_sch_device_unregister(struct subchannel *sch) |
213 | { | |
214 | mutex_lock(&sch->reg_mutex); | |
ef60cd13 SO |
215 | if (device_is_registered(&sch->dev)) |
216 | device_unregister(&sch->dev); | |
6ab4879a CH |
217 | mutex_unlock(&sch->reg_mutex); |
218 | } | |
44a1c19e | 219 | EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
6ab4879a | 220 | |
7ad6a249 PO |
221 | static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) |
222 | { | |
223 | int i; | |
224 | int mask; | |
225 | ||
226 | memset(ssd, 0, sizeof(struct chsc_ssd_info)); | |
227 | ssd->path_mask = pmcw->pim; | |
228 | for (i = 0; i < 8; i++) { | |
229 | mask = 0x80 >> i; | |
230 | if (pmcw->pim & mask) { | |
231 | chp_id_init(&ssd->chpid[i]); | |
232 | ssd->chpid[i].id = pmcw->chpid[i]; | |
233 | } | |
234 | } | |
235 | } | |
236 | ||
237 | static void ssd_register_chpids(struct chsc_ssd_info *ssd) | |
238 | { | |
239 | int i; | |
240 | int mask; | |
241 | ||
242 | for (i = 0; i < 8; i++) { | |
243 | mask = 0x80 >> i; | |
244 | if (ssd->path_mask & mask) | |
245 | if (!chp_is_registered(ssd->chpid[i])) | |
246 | chp_new(ssd->chpid[i]); | |
247 | } | |
248 | } | |
249 | ||
250 | void css_update_ssd_info(struct subchannel *sch) | |
251 | { | |
252 | int ret; | |
253 | ||
14556b33 SO |
254 | ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); |
255 | if (ret) | |
7ad6a249 | 256 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); |
14556b33 SO |
257 | |
258 | ssd_register_chpids(&sch->ssd_info); | |
7ad6a249 PO |
259 | } |
260 | ||
7e9db9ea CH |
261 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
262 | char *buf) | |
263 | { | |
264 | struct subchannel *sch = to_subchannel(dev); | |
265 | ||
266 | return sprintf(buf, "%01x\n", sch->st); | |
267 | } | |
268 | ||
269 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
270 | ||
271 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
272 | char *buf) | |
273 | { | |
274 | struct subchannel *sch = to_subchannel(dev); | |
275 | ||
276 | return sprintf(buf, "css:t%01X\n", sch->st); | |
277 | } | |
278 | ||
279 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); | |
280 | ||
281 | static struct attribute *subch_attrs[] = { | |
282 | &dev_attr_type.attr, | |
283 | &dev_attr_modalias.attr, | |
284 | NULL, | |
285 | }; | |
286 | ||
287 | static struct attribute_group subch_attr_group = { | |
288 | .attrs = subch_attrs, | |
289 | }; | |
290 | ||
a4dbd674 | 291 | static const struct attribute_group *default_subch_attr_groups[] = { |
7e9db9ea CH |
292 | &subch_attr_group, |
293 | NULL, | |
294 | }; | |
295 | ||
14556b33 | 296 | int css_register_subchannel(struct subchannel *sch) |
1da177e4 LT |
297 | { |
298 | int ret; | |
299 | ||
300 | /* Initialize the subchannel structure */ | |
7c9f4e3a | 301 | sch->dev.parent = &channel_subsystems[0]->device; |
1da177e4 | 302 | sch->dev.bus = &css_bus_type; |
7e9db9ea | 303 | sch->dev.groups = default_subch_attr_groups; |
5bf04b20 CH |
304 | /* |
305 | * We don't want to generate uevents for I/O subchannels that don't | |
306 | * have a working ccw device behind them since they will be | |
307 | * unregistered before they can be used anyway, so we delay the add | |
308 | * uevent until after device recognition was successful. | |
7e9db9ea CH |
309 | * Note that we suppress the uevent for all subchannel types; |
310 | * the subchannel driver can decide itself when it wants to inform | |
311 | * userspace of its existence. | |
5bf04b20 | 312 | */ |
f67f129e | 313 | dev_set_uevent_suppress(&sch->dev, 1); |
7ad6a249 | 314 | css_update_ssd_info(sch); |
1da177e4 | 315 | /* make it known to the system */ |
6ab4879a | 316 | ret = css_sch_device_register(sch); |
7674da77 | 317 | if (ret) { |
e556bbbd CH |
318 | CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n", |
319 | sch->schid.ssid, sch->schid.sch_no, ret); | |
7674da77 CH |
320 | return ret; |
321 | } | |
7e9db9ea CH |
322 | if (!sch->driver) { |
323 | /* | |
324 | * No driver matched. Generate the uevent now so that | |
325 | * a fitting driver module may be loaded based on the | |
326 | * modalias. | |
327 | */ | |
f67f129e | 328 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea CH |
329 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
330 | } | |
1da177e4 LT |
331 | return ret; |
332 | } | |
333 | ||
4e5ebd51 | 334 | static int css_probe_device(struct subchannel_id schid) |
1da177e4 | 335 | { |
1da177e4 | 336 | struct subchannel *sch; |
4e5ebd51 | 337 | int ret; |
1da177e4 | 338 | |
14556b33 SO |
339 | sch = css_alloc_subchannel(schid); |
340 | if (IS_ERR(sch)) | |
341 | return PTR_ERR(sch); | |
342 | ||
1da177e4 | 343 | ret = css_register_subchannel(sch); |
863fc849 SO |
344 | if (ret) |
345 | put_device(&sch->dev); | |
346 | ||
1da177e4 LT |
347 | return ret; |
348 | } | |
349 | ||
b0744bd2 CH |
350 | static int |
351 | check_subchannel(struct device * dev, void * data) | |
352 | { | |
353 | struct subchannel *sch; | |
a8237fc4 | 354 | struct subchannel_id *schid = data; |
b0744bd2 CH |
355 | |
356 | sch = to_subchannel(dev); | |
a8237fc4 | 357 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
358 | } |
359 | ||
1da177e4 | 360 | struct subchannel * |
a8237fc4 | 361 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 362 | { |
1da177e4 LT |
363 | struct device *dev; |
364 | ||
b0744bd2 | 365 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 366 | &schid, check_subchannel); |
1da177e4 | 367 | |
b0744bd2 | 368 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
369 | } |
370 | ||
b279a4f5 CH |
371 | /** |
372 | * css_sch_is_valid() - check if a subchannel is valid | |
373 | * @schib: subchannel information block for the subchannel | |
374 | */ | |
375 | int css_sch_is_valid(struct schib *schib) | |
376 | { | |
377 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) | |
378 | return 0; | |
b3a686f4 CH |
379 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) |
380 | return 0; | |
b279a4f5 CH |
381 | return 1; |
382 | } | |
383 | EXPORT_SYMBOL_GPL(css_sch_is_valid); | |
384 | ||
564337f3 PO |
385 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) |
386 | { | |
387 | struct schib schib; | |
388 | ||
389 | if (!slow) { | |
390 | /* Will be done on the slow path. */ | |
391 | return -EAGAIN; | |
392 | } | |
cec85466 SO |
393 | if (stsch_err(schid, &schib)) { |
394 | /* Subchannel is not provided. */ | |
395 | return -ENXIO; | |
396 | } | |
397 | if (!css_sch_is_valid(&schib)) { | |
564337f3 PO |
398 | /* Unusable - ignore. */ |
399 | return 0; | |
1da177e4 | 400 | } |
5d6e6b6f PO |
401 | CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new\n", schid.ssid, |
402 | schid.sch_no); | |
564337f3 PO |
403 | |
404 | return css_probe_device(schid); | |
405 | } | |
406 | ||
c820de39 CH |
407 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) |
408 | { | |
409 | int ret = 0; | |
410 | ||
411 | if (sch->driver) { | |
412 | if (sch->driver->sch_event) | |
413 | ret = sch->driver->sch_event(sch, slow); | |
414 | else | |
415 | dev_dbg(&sch->dev, | |
416 | "Got subchannel machine check but " | |
417 | "no sch_event handler provided.\n"); | |
418 | } | |
5d6e6b6f PO |
419 | if (ret != 0 && ret != -EAGAIN) { |
420 | CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n", | |
421 | sch->schid.ssid, sch->schid.sch_no, ret); | |
422 | } | |
c820de39 CH |
423 | return ret; |
424 | } | |
425 | ||
83b3370c | 426 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
427 | { |
428 | struct subchannel *sch; | |
429 | int ret; | |
430 | ||
431 | sch = get_subchannel_by_schid(schid); | |
432 | if (sch) { | |
433 | ret = css_evaluate_known_subchannel(sch, slow); | |
434 | put_device(&sch->dev); | |
435 | } else | |
436 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
437 | if (ret == -EAGAIN) |
438 | css_schedule_eval(schid); | |
1da177e4 LT |
439 | } |
440 | ||
817e5000 SO |
441 | /** |
442 | * css_sched_sch_todo - schedule a subchannel operation | |
443 | * @sch: subchannel | |
444 | * @todo: todo | |
445 | * | |
446 | * Schedule the operation identified by @todo to be performed on the slow path | |
447 | * workqueue. Do nothing if another operation with higher priority is already | |
448 | * scheduled. Needs to be called with subchannel lock held. | |
449 | */ | |
450 | void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo) | |
451 | { | |
452 | CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d\n", | |
453 | sch->schid.ssid, sch->schid.sch_no, todo); | |
454 | if (sch->todo >= todo) | |
455 | return; | |
456 | /* Get workqueue ref. */ | |
457 | if (!get_device(&sch->dev)) | |
458 | return; | |
459 | sch->todo = todo; | |
460 | if (!queue_work(cio_work_q, &sch->todo_work)) { | |
461 | /* Already queued, release workqueue ref. */ | |
462 | put_device(&sch->dev); | |
463 | } | |
464 | } | |
01c5e6dc | 465 | EXPORT_SYMBOL_GPL(css_sched_sch_todo); |
817e5000 SO |
466 | |
467 | static void css_sch_todo(struct work_struct *work) | |
468 | { | |
469 | struct subchannel *sch; | |
470 | enum sch_todo todo; | |
471 | int ret; | |
472 | ||
473 | sch = container_of(work, struct subchannel, todo_work); | |
474 | /* Find out todo. */ | |
475 | spin_lock_irq(sch->lock); | |
476 | todo = sch->todo; | |
477 | CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid, | |
478 | sch->schid.sch_no, todo); | |
479 | sch->todo = SCH_TODO_NOTHING; | |
480 | spin_unlock_irq(sch->lock); | |
481 | /* Perform todo. */ | |
482 | switch (todo) { | |
483 | case SCH_TODO_NOTHING: | |
484 | break; | |
485 | case SCH_TODO_EVAL: | |
486 | ret = css_evaluate_known_subchannel(sch, 1); | |
487 | if (ret == -EAGAIN) { | |
488 | spin_lock_irq(sch->lock); | |
489 | css_sched_sch_todo(sch, todo); | |
490 | spin_unlock_irq(sch->lock); | |
491 | } | |
492 | break; | |
493 | case SCH_TODO_UNREG: | |
494 | css_sch_device_unregister(sch); | |
495 | break; | |
496 | } | |
497 | /* Release workqueue ref. */ | |
498 | put_device(&sch->dev); | |
499 | } | |
500 | ||
83b3370c PO |
501 | static struct idset *slow_subchannel_set; |
502 | static spinlock_t slow_subchannel_lock; | |
25530553 SO |
503 | static wait_queue_head_t css_eval_wq; |
504 | static atomic_t css_eval_scheduled; | |
83b3370c PO |
505 | |
506 | static int __init slow_subchannel_init(void) | |
1da177e4 | 507 | { |
83b3370c | 508 | spin_lock_init(&slow_subchannel_lock); |
25530553 SO |
509 | atomic_set(&css_eval_scheduled, 0); |
510 | init_waitqueue_head(&css_eval_wq); | |
83b3370c PO |
511 | slow_subchannel_set = idset_sch_new(); |
512 | if (!slow_subchannel_set) { | |
e556bbbd | 513 | CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); |
83b3370c PO |
514 | return -ENOMEM; |
515 | } | |
516 | return 0; | |
1da177e4 LT |
517 | } |
518 | ||
e82a1567 | 519 | static int slow_eval_known_fn(struct subchannel *sch, void *data) |
1da177e4 | 520 | { |
e82a1567 PO |
521 | int eval; |
522 | int rc; | |
1da177e4 LT |
523 | |
524 | spin_lock_irq(&slow_subchannel_lock); | |
e82a1567 PO |
525 | eval = idset_sch_contains(slow_subchannel_set, sch->schid); |
526 | idset_sch_del(slow_subchannel_set, sch->schid); | |
527 | spin_unlock_irq(&slow_subchannel_lock); | |
528 | if (eval) { | |
529 | rc = css_evaluate_known_subchannel(sch, 1); | |
530 | if (rc == -EAGAIN) | |
531 | css_schedule_eval(sch->schid); | |
1da177e4 | 532 | } |
e82a1567 PO |
533 | return 0; |
534 | } | |
535 | ||
536 | static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) | |
537 | { | |
538 | int eval; | |
539 | int rc = 0; | |
540 | ||
541 | spin_lock_irq(&slow_subchannel_lock); | |
542 | eval = idset_sch_contains(slow_subchannel_set, schid); | |
543 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 544 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
545 | if (eval) { |
546 | rc = css_evaluate_new_subchannel(schid, 1); | |
547 | switch (rc) { | |
548 | case -EAGAIN: | |
549 | css_schedule_eval(schid); | |
550 | rc = 0; | |
551 | break; | |
552 | case -ENXIO: | |
553 | case -ENOMEM: | |
554 | case -EIO: | |
555 | /* These should abort looping */ | |
eb072a79 | 556 | spin_lock_irq(&slow_subchannel_lock); |
cec85466 | 557 | idset_sch_del_subseq(slow_subchannel_set, schid); |
eb072a79 | 558 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
559 | break; |
560 | default: | |
561 | rc = 0; | |
562 | } | |
b207f5a8 PO |
563 | /* Allow scheduling here since the containing loop might |
564 | * take a while. */ | |
565 | cond_resched(); | |
e82a1567 PO |
566 | } |
567 | return rc; | |
568 | } | |
569 | ||
570 | static void css_slow_path_func(struct work_struct *unused) | |
571 | { | |
25530553 SO |
572 | unsigned long flags; |
573 | ||
e82a1567 PO |
574 | CIO_TRACE_EVENT(4, "slowpath"); |
575 | for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, | |
576 | NULL); | |
25530553 SO |
577 | spin_lock_irqsave(&slow_subchannel_lock, flags); |
578 | if (idset_is_empty(slow_subchannel_set)) { | |
579 | atomic_set(&css_eval_scheduled, 0); | |
580 | wake_up(&css_eval_wq); | |
581 | } | |
582 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
1da177e4 LT |
583 | } |
584 | ||
175746eb | 585 | static DECLARE_DELAYED_WORK(slow_path_work, css_slow_path_func); |
be5d3823 | 586 | struct workqueue_struct *cio_work_q; |
1da177e4 | 587 | |
83b3370c PO |
588 | void css_schedule_eval(struct subchannel_id schid) |
589 | { | |
590 | unsigned long flags; | |
591 | ||
592 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
593 | idset_sch_add(slow_subchannel_set, schid); | |
25530553 | 594 | atomic_set(&css_eval_scheduled, 1); |
175746eb | 595 | queue_delayed_work(cio_work_q, &slow_path_work, 0); |
83b3370c PO |
596 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
597 | } | |
598 | ||
599 | void css_schedule_eval_all(void) | |
600 | { | |
601 | unsigned long flags; | |
602 | ||
603 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
604 | idset_fill(slow_subchannel_set); | |
25530553 | 605 | atomic_set(&css_eval_scheduled, 1); |
175746eb | 606 | queue_delayed_work(cio_work_q, &slow_path_work, 0); |
83b3370c PO |
607 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
608 | } | |
609 | ||
703e5c99 | 610 | static int __unset_registered(struct device *dev, void *data) |
22806dc1 | 611 | { |
703e5c99 SO |
612 | struct idset *set = data; |
613 | struct subchannel *sch = to_subchannel(dev); | |
40154b82 | 614 | |
703e5c99 SO |
615 | idset_sch_del(set, sch->schid); |
616 | return 0; | |
56e25e97 PO |
617 | } |
618 | ||
175746eb | 619 | void css_schedule_eval_all_unreg(unsigned long delay) |
40154b82 | 620 | { |
703e5c99 SO |
621 | unsigned long flags; |
622 | struct idset *unreg_set; | |
40154b82 | 623 | |
703e5c99 SO |
624 | /* Find unregistered subchannels. */ |
625 | unreg_set = idset_sch_new(); | |
626 | if (!unreg_set) { | |
627 | /* Fallback. */ | |
628 | css_schedule_eval_all(); | |
56e25e97 PO |
629 | return; |
630 | } | |
703e5c99 SO |
631 | idset_fill(unreg_set); |
632 | bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered); | |
633 | /* Apply to slow_subchannel_set. */ | |
634 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
635 | idset_add_set(slow_subchannel_set, unreg_set); | |
636 | atomic_set(&css_eval_scheduled, 1); | |
175746eb | 637 | queue_delayed_work(cio_work_q, &slow_path_work, delay); |
703e5c99 SO |
638 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
639 | idset_free(unreg_set); | |
40154b82 PO |
640 | } |
641 | ||
703e5c99 SO |
642 | void css_wait_for_slow_path(void) |
643 | { | |
be5d3823 | 644 | flush_workqueue(cio_work_q); |
703e5c99 | 645 | } |
40154b82 PO |
646 | |
647 | /* Schedule reprobing of all unregistered subchannels. */ | |
648 | void css_schedule_reprobe(void) | |
649 | { | |
175746eb PO |
650 | /* Schedule with a delay to allow merging of subsequent calls. */ |
651 | css_schedule_eval_all_unreg(1 * HZ); | |
40154b82 | 652 | } |
40154b82 PO |
653 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); |
654 | ||
1da177e4 LT |
655 | /* |
656 | * Called from the machine check handler for subchannel report words. | |
657 | */ | |
c1156189 | 658 | static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
1da177e4 | 659 | { |
a8237fc4 | 660 | struct subchannel_id mchk_schid; |
4bc4e965 | 661 | struct subchannel *sch; |
1da177e4 | 662 | |
c1156189 CH |
663 | if (overflow) { |
664 | css_schedule_eval_all(); | |
665 | return; | |
666 | } | |
667 | CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " | |
668 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
669 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
670 | crw0->erc, crw0->rsid); | |
671 | if (crw1) | |
672 | CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " | |
673 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
674 | crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, | |
675 | crw1->anc, crw1->erc, crw1->rsid); | |
a8237fc4 | 676 | init_subchannel_id(&mchk_schid); |
c1156189 CH |
677 | mchk_schid.sch_no = crw0->rsid; |
678 | if (crw1) | |
8d7bfb4a | 679 | mchk_schid.ssid = (crw1->rsid >> 4) & 3; |
fb6958a5 | 680 | |
4bc4e965 SO |
681 | if (crw0->erc == CRW_ERC_PMOD) { |
682 | sch = get_subchannel_by_schid(mchk_schid); | |
683 | if (sch) { | |
684 | css_update_ssd_info(sch); | |
685 | put_device(&sch->dev); | |
686 | } | |
687 | } | |
c1156189 | 688 | /* |
1da177e4 LT |
689 | * Since we are always presented with IPI in the CRW, we have to |
690 | * use stsch() to find out if the subchannel in question has come | |
691 | * or gone. | |
692 | */ | |
83b3370c | 693 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
694 | } |
695 | ||
696 | static void __init | |
a28c6944 | 697 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 698 | { |
94038a99 MS |
699 | struct cpuid cpu_id; |
700 | ||
75784c00 | 701 | if (css_general_characteristics.mcss) { |
a28c6944 CH |
702 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
703 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
704 | } else { | |
7b468488 | 705 | css->global_pgid.pgid_high.cpu_addr = stap(); |
1da177e4 | 706 | } |
94038a99 MS |
707 | get_cpu_id(&cpu_id); |
708 | css->global_pgid.cpu_id = cpu_id.ident; | |
709 | css->global_pgid.cpu_model = cpu_id.machine; | |
a28c6944 | 710 | css->global_pgid.tod_high = tod_high; |
a28c6944 CH |
711 | } |
712 | ||
3b793060 CH |
713 | static void |
714 | channel_subsystem_release(struct device *dev) | |
715 | { | |
716 | struct channel_subsystem *css; | |
717 | ||
718 | css = to_css(dev); | |
495a5b45 | 719 | mutex_destroy(&css->mutex); |
a2164b81 CH |
720 | if (css->pseudo_subchannel) { |
721 | /* Implies that it has been generated but never registered. */ | |
722 | css_subchannel_release(&css->pseudo_subchannel->dev); | |
723 | css->pseudo_subchannel = NULL; | |
724 | } | |
3b793060 CH |
725 | kfree(css); |
726 | } | |
727 | ||
495a5b45 CH |
728 | static ssize_t |
729 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
730 | char *buf) | |
731 | { | |
732 | struct channel_subsystem *css = to_css(dev); | |
8284fb19 | 733 | int ret; |
495a5b45 CH |
734 | |
735 | if (!css) | |
736 | return 0; | |
8284fb19 ME |
737 | mutex_lock(&css->mutex); |
738 | ret = sprintf(buf, "%x\n", css->cm_enabled); | |
739 | mutex_unlock(&css->mutex); | |
740 | return ret; | |
495a5b45 CH |
741 | } |
742 | ||
743 | static ssize_t | |
744 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
745 | const char *buf, size_t count) | |
746 | { | |
747 | struct channel_subsystem *css = to_css(dev); | |
748 | int ret; | |
2f972202 | 749 | unsigned long val; |
495a5b45 | 750 | |
0178722b | 751 | ret = kstrtoul(buf, 16, &val); |
2f972202 CH |
752 | if (ret) |
753 | return ret; | |
8284fb19 | 754 | mutex_lock(&css->mutex); |
2f972202 CH |
755 | switch (val) { |
756 | case 0: | |
495a5b45 CH |
757 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; |
758 | break; | |
2f972202 | 759 | case 1: |
495a5b45 CH |
760 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); |
761 | break; | |
762 | default: | |
763 | ret = -EINVAL; | |
764 | } | |
8284fb19 | 765 | mutex_unlock(&css->mutex); |
495a5b45 CH |
766 | return ret < 0 ? ret : count; |
767 | } | |
768 | ||
769 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
770 | ||
4d284cac | 771 | static int __init setup_css(int nr) |
a28c6944 CH |
772 | { |
773 | u32 tod_high; | |
d7b5a4c9 | 774 | int ret; |
7c9f4e3a | 775 | struct channel_subsystem *css; |
a28c6944 | 776 | |
7c9f4e3a CH |
777 | css = channel_subsystems[nr]; |
778 | memset(css, 0, sizeof(struct channel_subsystem)); | |
779 | css->pseudo_subchannel = | |
780 | kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL); | |
781 | if (!css->pseudo_subchannel) | |
d7b5a4c9 | 782 | return -ENOMEM; |
7c9f4e3a CH |
783 | css->pseudo_subchannel->dev.parent = &css->device; |
784 | css->pseudo_subchannel->dev.release = css_subchannel_release; | |
1bf5b285 | 785 | dev_set_name(&css->pseudo_subchannel->dev, "defunct"); |
5d6e6b6f | 786 | mutex_init(&css->pseudo_subchannel->reg_mutex); |
e5dcf002 | 787 | ret = css_sch_create_locks(css->pseudo_subchannel); |
d7b5a4c9 | 788 | if (ret) { |
7c9f4e3a | 789 | kfree(css->pseudo_subchannel); |
d7b5a4c9 CH |
790 | return ret; |
791 | } | |
7c9f4e3a CH |
792 | mutex_init(&css->mutex); |
793 | css->valid = 1; | |
794 | css->cssid = nr; | |
1bf5b285 | 795 | dev_set_name(&css->device, "css%x", nr); |
7c9f4e3a | 796 | css->device.release = channel_subsystem_release; |
1aae0560 | 797 | tod_high = (u32) (get_tod_clock() >> 32); |
7c9f4e3a | 798 | css_generate_pgid(css, tod_high); |
d7b5a4c9 | 799 | return 0; |
1da177e4 LT |
800 | } |
801 | ||
a55360df CH |
802 | static int css_reboot_event(struct notifier_block *this, |
803 | unsigned long event, | |
804 | void *ptr) | |
805 | { | |
806 | int ret, i; | |
807 | ||
808 | ret = NOTIFY_DONE; | |
809 | for (i = 0; i <= __MAX_CSSID; i++) { | |
810 | struct channel_subsystem *css; | |
811 | ||
812 | css = channel_subsystems[i]; | |
8284fb19 | 813 | mutex_lock(&css->mutex); |
a55360df CH |
814 | if (css->cm_enabled) |
815 | if (chsc_secm(css, 0)) | |
816 | ret = NOTIFY_BAD; | |
8284fb19 | 817 | mutex_unlock(&css->mutex); |
a55360df CH |
818 | } |
819 | ||
820 | return ret; | |
821 | } | |
822 | ||
823 | static struct notifier_block css_reboot_notifier = { | |
824 | .notifier_call = css_reboot_event, | |
825 | }; | |
826 | ||
dcbd16d5 SO |
827 | /* |
828 | * Since the css devices are neither on a bus nor have a class | |
829 | * nor have a special device type, we cannot stop/restart channel | |
830 | * path measurements via the normal suspend/resume callbacks, but have | |
831 | * to use notifiers. | |
832 | */ | |
833 | static int css_power_event(struct notifier_block *this, unsigned long event, | |
834 | void *ptr) | |
835 | { | |
dcbd16d5 SO |
836 | int ret, i; |
837 | ||
838 | switch (event) { | |
839 | case PM_HIBERNATION_PREPARE: | |
840 | case PM_SUSPEND_PREPARE: | |
841 | ret = NOTIFY_DONE; | |
842 | for (i = 0; i <= __MAX_CSSID; i++) { | |
843 | struct channel_subsystem *css; | |
844 | ||
845 | css = channel_subsystems[i]; | |
846 | mutex_lock(&css->mutex); | |
847 | if (!css->cm_enabled) { | |
848 | mutex_unlock(&css->mutex); | |
849 | continue; | |
850 | } | |
f0c077a8 AM |
851 | ret = __chsc_do_secm(css, 0); |
852 | ret = notifier_from_errno(ret); | |
dcbd16d5 SO |
853 | mutex_unlock(&css->mutex); |
854 | } | |
855 | break; | |
856 | case PM_POST_HIBERNATION: | |
857 | case PM_POST_SUSPEND: | |
858 | ret = NOTIFY_DONE; | |
859 | for (i = 0; i <= __MAX_CSSID; i++) { | |
860 | struct channel_subsystem *css; | |
861 | ||
862 | css = channel_subsystems[i]; | |
863 | mutex_lock(&css->mutex); | |
864 | if (!css->cm_enabled) { | |
865 | mutex_unlock(&css->mutex); | |
866 | continue; | |
867 | } | |
f0c077a8 AM |
868 | ret = __chsc_do_secm(css, 1); |
869 | ret = notifier_from_errno(ret); | |
dcbd16d5 SO |
870 | mutex_unlock(&css->mutex); |
871 | } | |
872 | /* search for subchannels, which appeared during hibernation */ | |
873 | css_schedule_reprobe(); | |
874 | break; | |
875 | default: | |
876 | ret = NOTIFY_DONE; | |
877 | } | |
878 | return ret; | |
879 | ||
880 | } | |
881 | static struct notifier_block css_power_notifier = { | |
882 | .notifier_call = css_power_event, | |
883 | }; | |
884 | ||
1da177e4 LT |
885 | /* |
886 | * Now that the driver core is running, we can setup our channel subsystem. | |
14556b33 | 887 | * The struct subchannel's are created during probing. |
1da177e4 | 888 | */ |
2f17644d | 889 | static int __init css_bus_init(void) |
1da177e4 | 890 | { |
a28c6944 | 891 | int ret, i; |
1da177e4 | 892 | |
34aec07c SO |
893 | ret = chsc_init(); |
894 | if (ret) | |
895 | return ret; | |
896 | ||
34196f82 | 897 | chsc_determine_css_characteristics(); |
b0a285d3 SO |
898 | /* Try to enable MSS. */ |
899 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
818c272b | 900 | if (ret) |
b0a285d3 | 901 | max_ssid = 0; |
818c272b SO |
902 | else /* Success. */ |
903 | max_ssid = __MAX_SSID; | |
b0a285d3 | 904 | |
4434a38c CH |
905 | ret = slow_subchannel_init(); |
906 | if (ret) | |
907 | goto out; | |
908 | ||
f5daba1d | 909 | ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); |
c1156189 CH |
910 | if (ret) |
911 | goto out; | |
912 | ||
1da177e4 LT |
913 | if ((ret = bus_register(&css_bus_type))) |
914 | goto out; | |
1da177e4 | 915 | |
a28c6944 CH |
916 | /* Setup css structure. */ |
917 | for (i = 0; i <= __MAX_CSSID; i++) { | |
7c9f4e3a CH |
918 | struct channel_subsystem *css; |
919 | ||
920 | css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
921 | if (!css) { | |
a28c6944 | 922 | ret = -ENOMEM; |
fb6958a5 | 923 | goto out_unregister; |
a28c6944 | 924 | } |
7c9f4e3a | 925 | channel_subsystems[i] = css; |
d7b5a4c9 | 926 | ret = setup_css(i); |
a2164b81 CH |
927 | if (ret) { |
928 | kfree(channel_subsystems[i]); | |
929 | goto out_unregister; | |
930 | } | |
7c9f4e3a | 931 | ret = device_register(&css->device); |
a2164b81 CH |
932 | if (ret) { |
933 | put_device(&css->device); | |
934 | goto out_unregister; | |
935 | } | |
75784c00 | 936 | if (css_chsc_characteristics.secm) { |
7c9f4e3a | 937 | ret = device_create_file(&css->device, |
7e560814 CH |
938 | &dev_attr_cm_enable); |
939 | if (ret) | |
940 | goto out_device; | |
941 | } | |
7c9f4e3a | 942 | ret = device_register(&css->pseudo_subchannel->dev); |
c6304933 SO |
943 | if (ret) { |
944 | put_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 | 945 | goto out_file; |
c6304933 | 946 | } |
a28c6944 | 947 | } |
a55360df CH |
948 | ret = register_reboot_notifier(&css_reboot_notifier); |
949 | if (ret) | |
a2164b81 | 950 | goto out_unregister; |
dcbd16d5 SO |
951 | ret = register_pm_notifier(&css_power_notifier); |
952 | if (ret) { | |
953 | unregister_reboot_notifier(&css_reboot_notifier); | |
954 | goto out_unregister; | |
955 | } | |
1da177e4 LT |
956 | css_init_done = 1; |
957 | ||
3a3fc29a | 958 | /* Enable default isc for I/O subchannels. */ |
6ef556cc | 959 | isc_register(IO_SCH_ISC); |
1da177e4 | 960 | |
1da177e4 | 961 | return 0; |
d7b5a4c9 | 962 | out_file: |
a2164b81 CH |
963 | if (css_chsc_characteristics.secm) |
964 | device_remove_file(&channel_subsystems[i]->device, | |
965 | &dev_attr_cm_enable); | |
7e560814 | 966 | out_device: |
7c9f4e3a | 967 | device_unregister(&channel_subsystems[i]->device); |
fb6958a5 | 968 | out_unregister: |
a28c6944 | 969 | while (i > 0) { |
7c9f4e3a CH |
970 | struct channel_subsystem *css; |
971 | ||
a28c6944 | 972 | i--; |
7c9f4e3a CH |
973 | css = channel_subsystems[i]; |
974 | device_unregister(&css->pseudo_subchannel->dev); | |
a2164b81 | 975 | css->pseudo_subchannel = NULL; |
75784c00 | 976 | if (css_chsc_characteristics.secm) |
7c9f4e3a | 977 | device_remove_file(&css->device, |
495a5b45 | 978 | &dev_attr_cm_enable); |
7c9f4e3a | 979 | device_unregister(&css->device); |
a28c6944 | 980 | } |
1da177e4 LT |
981 | bus_unregister(&css_bus_type); |
982 | out: | |
34aec07c | 983 | crw_unregister_handler(CRW_RSC_SCH); |
b827d1c8 | 984 | idset_free(slow_subchannel_set); |
34aec07c | 985 | chsc_init_cleanup(); |
e6d5a428 ME |
986 | pr_alert("The CSS device driver initialization failed with " |
987 | "errno=%d\n", ret); | |
1da177e4 LT |
988 | return ret; |
989 | } | |
990 | ||
2f17644d SO |
991 | static void __init css_bus_cleanup(void) |
992 | { | |
993 | struct channel_subsystem *css; | |
994 | int i; | |
995 | ||
996 | for (i = 0; i <= __MAX_CSSID; i++) { | |
997 | css = channel_subsystems[i]; | |
998 | device_unregister(&css->pseudo_subchannel->dev); | |
999 | css->pseudo_subchannel = NULL; | |
1000 | if (css_chsc_characteristics.secm) | |
1001 | device_remove_file(&css->device, &dev_attr_cm_enable); | |
1002 | device_unregister(&css->device); | |
1003 | } | |
1004 | bus_unregister(&css_bus_type); | |
34aec07c | 1005 | crw_unregister_handler(CRW_RSC_SCH); |
b827d1c8 | 1006 | idset_free(slow_subchannel_set); |
34aec07c | 1007 | chsc_init_cleanup(); |
2f17644d SO |
1008 | isc_unregister(IO_SCH_ISC); |
1009 | } | |
1010 | ||
1011 | static int __init channel_subsystem_init(void) | |
1012 | { | |
1013 | int ret; | |
1014 | ||
1015 | ret = css_bus_init(); | |
1016 | if (ret) | |
1017 | return ret; | |
be5d3823 SO |
1018 | cio_work_q = create_singlethread_workqueue("cio"); |
1019 | if (!cio_work_q) { | |
1020 | ret = -ENOMEM; | |
1021 | goto out_bus; | |
1022 | } | |
2f17644d SO |
1023 | ret = io_subchannel_init(); |
1024 | if (ret) | |
be5d3823 | 1025 | goto out_wq; |
2f17644d SO |
1026 | |
1027 | return ret; | |
be5d3823 SO |
1028 | out_wq: |
1029 | destroy_workqueue(cio_work_q); | |
1030 | out_bus: | |
1031 | css_bus_cleanup(); | |
1032 | return ret; | |
2f17644d SO |
1033 | } |
1034 | subsys_initcall(channel_subsystem_init); | |
1035 | ||
8ea7f559 SO |
1036 | static int css_settle(struct device_driver *drv, void *unused) |
1037 | { | |
1038 | struct css_driver *cssdrv = to_cssdriver(drv); | |
1039 | ||
1040 | if (cssdrv->settle) | |
b4c70721 | 1041 | return cssdrv->settle(); |
8ea7f559 SO |
1042 | return 0; |
1043 | } | |
1044 | ||
0d01bb89 | 1045 | int css_complete_work(void) |
879acca5 SO |
1046 | { |
1047 | int ret; | |
1048 | ||
1049 | /* Wait for the evaluation of subchannels to finish. */ | |
b4c70721 SO |
1050 | ret = wait_event_interruptible(css_eval_wq, |
1051 | atomic_read(&css_eval_scheduled) == 0); | |
1052 | if (ret) | |
1053 | return -EINTR; | |
879acca5 SO |
1054 | flush_workqueue(cio_work_q); |
1055 | /* Wait for the subchannel type specific initialization to finish */ | |
b4c70721 | 1056 | return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle); |
879acca5 SO |
1057 | } |
1058 | ||
1059 | ||
2f17644d SO |
1060 | /* |
1061 | * Wait for the initialization of devices to finish, to make sure we are | |
1062 | * done with our setup if the search for the root device starts. | |
1063 | */ | |
1064 | static int __init channel_subsystem_init_sync(void) | |
1065 | { | |
14556b33 SO |
1066 | /* Register subchannels which are already in use. */ |
1067 | cio_register_early_subchannels(); | |
703e5c99 SO |
1068 | /* Start initial subchannel evaluation. */ |
1069 | css_schedule_eval_all(); | |
879acca5 SO |
1070 | css_complete_work(); |
1071 | return 0; | |
2f17644d SO |
1072 | } |
1073 | subsys_initcall_sync(channel_subsystem_init_sync); | |
1074 | ||
889ee955 SO |
1075 | void channel_subsystem_reinit(void) |
1076 | { | |
62da177a SO |
1077 | struct channel_path *chp; |
1078 | struct chp_id chpid; | |
1079 | ||
889ee955 | 1080 | chsc_enable_facility(CHSC_SDA_OC_MSS); |
62da177a SO |
1081 | chp_id_for_each(&chpid) { |
1082 | chp = chpid_to_chp(chpid); | |
cce0eacc PO |
1083 | if (chp) |
1084 | chp_update_desc(chp); | |
62da177a | 1085 | } |
ab97d211 | 1086 | cmf_reactivate(); |
889ee955 SO |
1087 | } |
1088 | ||
879acca5 SO |
1089 | #ifdef CONFIG_PROC_FS |
1090 | static ssize_t cio_settle_write(struct file *file, const char __user *buf, | |
1091 | size_t count, loff_t *ppos) | |
1092 | { | |
b4c70721 SO |
1093 | int ret; |
1094 | ||
879acca5 SO |
1095 | /* Handle pending CRW's. */ |
1096 | crw_wait_for_channel_report(); | |
b4c70721 SO |
1097 | ret = css_complete_work(); |
1098 | ||
1099 | return ret ? ret : count; | |
879acca5 SO |
1100 | } |
1101 | ||
1102 | static const struct file_operations cio_settle_proc_fops = { | |
58ea91c0 | 1103 | .open = nonseekable_open, |
879acca5 | 1104 | .write = cio_settle_write, |
6038f373 | 1105 | .llseek = no_llseek, |
879acca5 SO |
1106 | }; |
1107 | ||
1108 | static int __init cio_settle_init(void) | |
1109 | { | |
1110 | struct proc_dir_entry *entry; | |
1111 | ||
1112 | entry = proc_create("cio_settle", S_IWUSR, NULL, | |
1113 | &cio_settle_proc_fops); | |
1114 | if (!entry) | |
1115 | return -ENOMEM; | |
1116 | return 0; | |
1117 | } | |
1118 | device_initcall(cio_settle_init); | |
1119 | #endif /*CONFIG_PROC_FS*/ | |
1120 | ||
d7b5a4c9 CH |
1121 | int sch_is_pseudo_sch(struct subchannel *sch) |
1122 | { | |
1123 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
1124 | } | |
1125 | ||
f08adc00 | 1126 | static int css_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1127 | { |
084325d8 CH |
1128 | struct subchannel *sch = to_subchannel(dev); |
1129 | struct css_driver *driver = to_cssdriver(drv); | |
f08adc00 | 1130 | struct css_device_id *id; |
1da177e4 | 1131 | |
f08adc00 CH |
1132 | for (id = driver->subchannel_type; id->match_flags; id++) { |
1133 | if (sch->st == id->type) | |
1134 | return 1; | |
1135 | } | |
1da177e4 LT |
1136 | |
1137 | return 0; | |
1138 | } | |
1139 | ||
98c13c28 | 1140 | static int css_probe(struct device *dev) |
8bbace7e CH |
1141 | { |
1142 | struct subchannel *sch; | |
98c13c28 | 1143 | int ret; |
8bbace7e CH |
1144 | |
1145 | sch = to_subchannel(dev); | |
084325d8 | 1146 | sch->driver = to_cssdriver(dev->driver); |
98c13c28 CH |
1147 | ret = sch->driver->probe ? sch->driver->probe(sch) : 0; |
1148 | if (ret) | |
1149 | sch->driver = NULL; | |
1150 | return ret; | |
8bbace7e CH |
1151 | } |
1152 | ||
98c13c28 | 1153 | static int css_remove(struct device *dev) |
8bbace7e CH |
1154 | { |
1155 | struct subchannel *sch; | |
98c13c28 | 1156 | int ret; |
8bbace7e CH |
1157 | |
1158 | sch = to_subchannel(dev); | |
98c13c28 CH |
1159 | ret = sch->driver->remove ? sch->driver->remove(sch) : 0; |
1160 | sch->driver = NULL; | |
1161 | return ret; | |
8bbace7e CH |
1162 | } |
1163 | ||
98c13c28 | 1164 | static void css_shutdown(struct device *dev) |
8bbace7e CH |
1165 | { |
1166 | struct subchannel *sch; | |
1167 | ||
1168 | sch = to_subchannel(dev); | |
98c13c28 | 1169 | if (sch->driver && sch->driver->shutdown) |
8bbace7e CH |
1170 | sch->driver->shutdown(sch); |
1171 | } | |
1172 | ||
7e9db9ea CH |
1173 | static int css_uevent(struct device *dev, struct kobj_uevent_env *env) |
1174 | { | |
1175 | struct subchannel *sch = to_subchannel(dev); | |
1176 | int ret; | |
1177 | ||
1178 | ret = add_uevent_var(env, "ST=%01X", sch->st); | |
1179 | if (ret) | |
1180 | return ret; | |
1181 | ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); | |
1182 | return ret; | |
1183 | } | |
1184 | ||
dcbd16d5 SO |
1185 | static int css_pm_prepare(struct device *dev) |
1186 | { | |
1187 | struct subchannel *sch = to_subchannel(dev); | |
1188 | struct css_driver *drv; | |
1189 | ||
1190 | if (mutex_is_locked(&sch->reg_mutex)) | |
1191 | return -EAGAIN; | |
1192 | if (!sch->dev.driver) | |
1193 | return 0; | |
1194 | drv = to_cssdriver(sch->dev.driver); | |
1195 | /* Notify drivers that they may not register children. */ | |
1196 | return drv->prepare ? drv->prepare(sch) : 0; | |
1197 | } | |
1198 | ||
1199 | static void css_pm_complete(struct device *dev) | |
1200 | { | |
1201 | struct subchannel *sch = to_subchannel(dev); | |
1202 | struct css_driver *drv; | |
1203 | ||
1204 | if (!sch->dev.driver) | |
1205 | return; | |
1206 | drv = to_cssdriver(sch->dev.driver); | |
1207 | if (drv->complete) | |
1208 | drv->complete(sch); | |
1209 | } | |
1210 | ||
1211 | static int css_pm_freeze(struct device *dev) | |
1212 | { | |
1213 | struct subchannel *sch = to_subchannel(dev); | |
1214 | struct css_driver *drv; | |
1215 | ||
1216 | if (!sch->dev.driver) | |
1217 | return 0; | |
1218 | drv = to_cssdriver(sch->dev.driver); | |
1219 | return drv->freeze ? drv->freeze(sch) : 0; | |
1220 | } | |
1221 | ||
1222 | static int css_pm_thaw(struct device *dev) | |
1223 | { | |
1224 | struct subchannel *sch = to_subchannel(dev); | |
1225 | struct css_driver *drv; | |
1226 | ||
1227 | if (!sch->dev.driver) | |
1228 | return 0; | |
1229 | drv = to_cssdriver(sch->dev.driver); | |
1230 | return drv->thaw ? drv->thaw(sch) : 0; | |
1231 | } | |
1232 | ||
1233 | static int css_pm_restore(struct device *dev) | |
1234 | { | |
1235 | struct subchannel *sch = to_subchannel(dev); | |
1236 | struct css_driver *drv; | |
1237 | ||
eb4f5d93 | 1238 | css_update_ssd_info(sch); |
dcbd16d5 SO |
1239 | if (!sch->dev.driver) |
1240 | return 0; | |
1241 | drv = to_cssdriver(sch->dev.driver); | |
1242 | return drv->restore ? drv->restore(sch) : 0; | |
1243 | } | |
1244 | ||
47145210 | 1245 | static const struct dev_pm_ops css_pm_ops = { |
dcbd16d5 SO |
1246 | .prepare = css_pm_prepare, |
1247 | .complete = css_pm_complete, | |
1248 | .freeze = css_pm_freeze, | |
1249 | .thaw = css_pm_thaw, | |
1250 | .restore = css_pm_restore, | |
1251 | }; | |
1252 | ||
3041b6ab | 1253 | static struct bus_type css_bus_type = { |
8bbace7e CH |
1254 | .name = "css", |
1255 | .match = css_bus_match, | |
1256 | .probe = css_probe, | |
1257 | .remove = css_remove, | |
1258 | .shutdown = css_shutdown, | |
7e9db9ea | 1259 | .uevent = css_uevent, |
dcbd16d5 | 1260 | .pm = &css_pm_ops, |
1da177e4 LT |
1261 | }; |
1262 | ||
25b7bb58 CH |
1263 | /** |
1264 | * css_driver_register - register a css driver | |
1265 | * @cdrv: css driver to register | |
1266 | * | |
1267 | * This is mainly a wrapper around driver_register that sets name | |
1268 | * and bus_type in the embedded struct device_driver correctly. | |
1269 | */ | |
1270 | int css_driver_register(struct css_driver *cdrv) | |
1271 | { | |
25b7bb58 CH |
1272 | cdrv->drv.bus = &css_bus_type; |
1273 | return driver_register(&cdrv->drv); | |
1274 | } | |
1275 | EXPORT_SYMBOL_GPL(css_driver_register); | |
1276 | ||
1277 | /** | |
1278 | * css_driver_unregister - unregister a css driver | |
1279 | * @cdrv: css driver to unregister | |
1280 | * | |
1281 | * This is a wrapper around driver_unregister. | |
1282 | */ | |
1283 | void css_driver_unregister(struct css_driver *cdrv) | |
1284 | { | |
1285 | driver_unregister(&cdrv->drv); | |
1286 | } | |
1287 | EXPORT_SYMBOL_GPL(css_driver_unregister); | |
1288 | ||
1da177e4 | 1289 | MODULE_LICENSE("GPL"); |