Commit | Line | Data |
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724117b7 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
dcbd16d5 | 3 | * driver for channel subsystem |
1da177e4 | 4 | * |
34aec07c | 5 | * Copyright IBM Corp. 2002, 2010 |
dcbd16d5 SO |
6 | * |
7 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
8 | * Cornelia Huck (cornelia.huck@de.ibm.com) | |
1da177e4 | 9 | */ |
e6d5a428 ME |
10 | |
11 | #define KMSG_COMPONENT "cio" | |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
a00f761f | 14 | #include <linux/export.h> |
1da177e4 LT |
15 | #include <linux/init.h> |
16 | #include <linux/device.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/list.h> | |
a55360df | 20 | #include <linux/reboot.h> |
dcbd16d5 | 21 | #include <linux/suspend.h> |
879acca5 | 22 | #include <linux/proc_fs.h> |
3a3fc29a | 23 | #include <asm/isc.h> |
f5daba1d | 24 | #include <asm/crw.h> |
1da177e4 LT |
25 | |
26 | #include "css.h" | |
27 | #include "cio.h" | |
28 | #include "cio_debug.h" | |
29 | #include "ioasm.h" | |
30 | #include "chsc.h" | |
40154b82 | 31 | #include "device.h" |
83b3370c | 32 | #include "idset.h" |
7ad6a249 | 33 | #include "chp.h" |
1da177e4 | 34 | |
1da177e4 | 35 | int css_init_done = 0; |
b0a285d3 | 36 | int max_ssid; |
1da177e4 | 37 | |
98cc43ab SO |
38 | #define MAX_CSS_IDX 0 |
39 | struct channel_subsystem *channel_subsystems[MAX_CSS_IDX + 1]; | |
3041b6ab | 40 | static struct bus_type css_bus_type; |
1da177e4 | 41 | |
4d284cac | 42 | int |
f97a56fb CH |
43 | for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) |
44 | { | |
45 | struct subchannel_id schid; | |
46 | int ret; | |
47 | ||
48 | init_subchannel_id(&schid); | |
f97a56fb | 49 | do { |
fb6958a5 CH |
50 | do { |
51 | ret = fn(schid, data); | |
52 | if (ret) | |
53 | break; | |
54 | } while (schid.sch_no++ < __MAX_SUBCHANNEL); | |
55 | schid.sch_no = 0; | |
56 | } while (schid.ssid++ < max_ssid); | |
f97a56fb CH |
57 | return ret; |
58 | } | |
59 | ||
e82a1567 PO |
60 | struct cb_data { |
61 | void *data; | |
62 | struct idset *set; | |
63 | int (*fn_known_sch)(struct subchannel *, void *); | |
64 | int (*fn_unknown_sch)(struct subchannel_id, void *); | |
65 | }; | |
66 | ||
67 | static int call_fn_known_sch(struct device *dev, void *data) | |
68 | { | |
69 | struct subchannel *sch = to_subchannel(dev); | |
70 | struct cb_data *cb = data; | |
71 | int rc = 0; | |
72 | ||
47d30674 PO |
73 | if (cb->set) |
74 | idset_sch_del(cb->set, sch->schid); | |
e82a1567 PO |
75 | if (cb->fn_known_sch) |
76 | rc = cb->fn_known_sch(sch, cb->data); | |
77 | return rc; | |
78 | } | |
79 | ||
80 | static int call_fn_unknown_sch(struct subchannel_id schid, void *data) | |
81 | { | |
82 | struct cb_data *cb = data; | |
83 | int rc = 0; | |
84 | ||
85 | if (idset_sch_contains(cb->set, schid)) | |
86 | rc = cb->fn_unknown_sch(schid, cb->data); | |
87 | return rc; | |
88 | } | |
89 | ||
90ac24a5 SO |
90 | static int call_fn_all_sch(struct subchannel_id schid, void *data) |
91 | { | |
92 | struct cb_data *cb = data; | |
93 | struct subchannel *sch; | |
94 | int rc = 0; | |
95 | ||
96 | sch = get_subchannel_by_schid(schid); | |
97 | if (sch) { | |
98 | if (cb->fn_known_sch) | |
99 | rc = cb->fn_known_sch(sch, cb->data); | |
100 | put_device(&sch->dev); | |
101 | } else { | |
102 | if (cb->fn_unknown_sch) | |
103 | rc = cb->fn_unknown_sch(schid, cb->data); | |
104 | } | |
105 | ||
106 | return rc; | |
107 | } | |
108 | ||
e82a1567 PO |
109 | int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), |
110 | int (*fn_unknown)(struct subchannel_id, | |
111 | void *), void *data) | |
112 | { | |
113 | struct cb_data cb; | |
114 | int rc; | |
115 | ||
e82a1567 PO |
116 | cb.data = data; |
117 | cb.fn_known_sch = fn_known; | |
118 | cb.fn_unknown_sch = fn_unknown; | |
90ac24a5 | 119 | |
47d30674 PO |
120 | if (fn_known && !fn_unknown) { |
121 | /* Skip idset allocation in case of known-only loop. */ | |
122 | cb.set = NULL; | |
123 | return bus_for_each_dev(&css_bus_type, NULL, &cb, | |
124 | call_fn_known_sch); | |
125 | } | |
126 | ||
90ac24a5 SO |
127 | cb.set = idset_sch_new(); |
128 | if (!cb.set) | |
129 | /* fall back to brute force scanning in case of oom */ | |
130 | return for_each_subchannel(call_fn_all_sch, &cb); | |
131 | ||
132 | idset_fill(cb.set); | |
133 | ||
e82a1567 PO |
134 | /* Process registered subchannels. */ |
135 | rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); | |
136 | if (rc) | |
137 | goto out; | |
138 | /* Process unregistered subchannels. */ | |
139 | if (fn_unknown) | |
140 | rc = for_each_subchannel(call_fn_unknown_sch, &cb); | |
141 | out: | |
142 | idset_free(cb.set); | |
143 | ||
144 | return rc; | |
145 | } | |
146 | ||
390935ac PO |
147 | static void css_sch_todo(struct work_struct *work); |
148 | ||
e5dcf002 SO |
149 | static int css_sch_create_locks(struct subchannel *sch) |
150 | { | |
151 | sch->lock = kmalloc(sizeof(*sch->lock), GFP_KERNEL); | |
152 | if (!sch->lock) | |
153 | return -ENOMEM; | |
154 | ||
155 | spin_lock_init(sch->lock); | |
156 | mutex_init(&sch->reg_mutex); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
c135ad1c SO |
161 | static void css_subchannel_release(struct device *dev) |
162 | { | |
863fc849 | 163 | struct subchannel *sch = to_subchannel(dev); |
c135ad1c | 164 | |
863fc849 SO |
165 | sch->config.intparm = 0; |
166 | cio_commit_config(sch); | |
167 | kfree(sch->lock); | |
168 | kfree(sch); | |
c135ad1c SO |
169 | } |
170 | ||
863fc849 | 171 | struct subchannel *css_alloc_subchannel(struct subchannel_id schid) |
1da177e4 LT |
172 | { |
173 | struct subchannel *sch; | |
174 | int ret; | |
175 | ||
e5dcf002 SO |
176 | sch = kzalloc(sizeof(*sch), GFP_KERNEL | GFP_DMA); |
177 | if (!sch) | |
1da177e4 | 178 | return ERR_PTR(-ENOMEM); |
e5dcf002 SO |
179 | |
180 | ret = cio_validate_subchannel(sch, schid); | |
181 | if (ret < 0) | |
182 | goto err; | |
183 | ||
184 | ret = css_sch_create_locks(sch); | |
185 | if (ret) | |
186 | goto err; | |
187 | ||
390935ac | 188 | INIT_WORK(&sch->todo_work, css_sch_todo); |
c135ad1c SO |
189 | sch->dev.release = &css_subchannel_release; |
190 | device_initialize(&sch->dev); | |
1da177e4 | 191 | return sch; |
e5dcf002 SO |
192 | |
193 | err: | |
194 | kfree(sch); | |
195 | return ERR_PTR(ret); | |
1da177e4 LT |
196 | } |
197 | ||
07c6a338 | 198 | static int css_sch_device_register(struct subchannel *sch) |
6ab4879a CH |
199 | { |
200 | int ret; | |
201 | ||
202 | mutex_lock(&sch->reg_mutex); | |
6ee4fec6 SO |
203 | dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, |
204 | sch->schid.sch_no); | |
c135ad1c | 205 | ret = device_add(&sch->dev); |
6ab4879a CH |
206 | mutex_unlock(&sch->reg_mutex); |
207 | return ret; | |
208 | } | |
209 | ||
44a1c19e CH |
210 | /** |
211 | * css_sch_device_unregister - unregister a subchannel | |
212 | * @sch: subchannel to be unregistered | |
213 | */ | |
6ab4879a CH |
214 | void css_sch_device_unregister(struct subchannel *sch) |
215 | { | |
216 | mutex_lock(&sch->reg_mutex); | |
ef60cd13 SO |
217 | if (device_is_registered(&sch->dev)) |
218 | device_unregister(&sch->dev); | |
6ab4879a CH |
219 | mutex_unlock(&sch->reg_mutex); |
220 | } | |
44a1c19e | 221 | EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
6ab4879a | 222 | |
7ad6a249 PO |
223 | static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) |
224 | { | |
225 | int i; | |
226 | int mask; | |
227 | ||
228 | memset(ssd, 0, sizeof(struct chsc_ssd_info)); | |
229 | ssd->path_mask = pmcw->pim; | |
230 | for (i = 0; i < 8; i++) { | |
231 | mask = 0x80 >> i; | |
232 | if (pmcw->pim & mask) { | |
233 | chp_id_init(&ssd->chpid[i]); | |
234 | ssd->chpid[i].id = pmcw->chpid[i]; | |
235 | } | |
236 | } | |
237 | } | |
238 | ||
239 | static void ssd_register_chpids(struct chsc_ssd_info *ssd) | |
240 | { | |
241 | int i; | |
242 | int mask; | |
243 | ||
244 | for (i = 0; i < 8; i++) { | |
245 | mask = 0x80 >> i; | |
246 | if (ssd->path_mask & mask) | |
247 | if (!chp_is_registered(ssd->chpid[i])) | |
248 | chp_new(ssd->chpid[i]); | |
249 | } | |
250 | } | |
251 | ||
252 | void css_update_ssd_info(struct subchannel *sch) | |
253 | { | |
254 | int ret; | |
255 | ||
14556b33 SO |
256 | ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); |
257 | if (ret) | |
7ad6a249 | 258 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); |
14556b33 SO |
259 | |
260 | ssd_register_chpids(&sch->ssd_info); | |
7ad6a249 PO |
261 | } |
262 | ||
7e9db9ea CH |
263 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
264 | char *buf) | |
265 | { | |
266 | struct subchannel *sch = to_subchannel(dev); | |
267 | ||
268 | return sprintf(buf, "%01x\n", sch->st); | |
269 | } | |
270 | ||
271 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
272 | ||
273 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
274 | char *buf) | |
275 | { | |
276 | struct subchannel *sch = to_subchannel(dev); | |
277 | ||
278 | return sprintf(buf, "css:t%01X\n", sch->st); | |
279 | } | |
280 | ||
281 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); | |
282 | ||
283 | static struct attribute *subch_attrs[] = { | |
284 | &dev_attr_type.attr, | |
285 | &dev_attr_modalias.attr, | |
286 | NULL, | |
287 | }; | |
288 | ||
289 | static struct attribute_group subch_attr_group = { | |
290 | .attrs = subch_attrs, | |
291 | }; | |
292 | ||
a4dbd674 | 293 | static const struct attribute_group *default_subch_attr_groups[] = { |
7e9db9ea CH |
294 | &subch_attr_group, |
295 | NULL, | |
296 | }; | |
297 | ||
36f6237e SO |
298 | static ssize_t chpids_show(struct device *dev, |
299 | struct device_attribute *attr, | |
300 | char *buf) | |
301 | { | |
302 | struct subchannel *sch = to_subchannel(dev); | |
303 | struct chsc_ssd_info *ssd = &sch->ssd_info; | |
304 | ssize_t ret = 0; | |
305 | int mask; | |
306 | int chp; | |
307 | ||
308 | for (chp = 0; chp < 8; chp++) { | |
309 | mask = 0x80 >> chp; | |
310 | if (ssd->path_mask & mask) | |
311 | ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); | |
312 | else | |
313 | ret += sprintf(buf + ret, "00 "); | |
314 | } | |
315 | ret += sprintf(buf + ret, "\n"); | |
316 | return ret; | |
317 | } | |
318 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
319 | ||
320 | static ssize_t pimpampom_show(struct device *dev, | |
321 | struct device_attribute *attr, | |
322 | char *buf) | |
323 | { | |
324 | struct subchannel *sch = to_subchannel(dev); | |
325 | struct pmcw *pmcw = &sch->schib.pmcw; | |
326 | ||
327 | return sprintf(buf, "%02x %02x %02x\n", | |
328 | pmcw->pim, pmcw->pam, pmcw->pom); | |
329 | } | |
330 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
331 | ||
332 | static struct attribute *io_subchannel_type_attrs[] = { | |
333 | &dev_attr_chpids.attr, | |
334 | &dev_attr_pimpampom.attr, | |
335 | NULL, | |
336 | }; | |
337 | ATTRIBUTE_GROUPS(io_subchannel_type); | |
338 | ||
339 | static const struct device_type io_subchannel_type = { | |
340 | .groups = io_subchannel_type_groups, | |
341 | }; | |
342 | ||
14556b33 | 343 | int css_register_subchannel(struct subchannel *sch) |
1da177e4 LT |
344 | { |
345 | int ret; | |
346 | ||
347 | /* Initialize the subchannel structure */ | |
7c9f4e3a | 348 | sch->dev.parent = &channel_subsystems[0]->device; |
1da177e4 | 349 | sch->dev.bus = &css_bus_type; |
7e9db9ea | 350 | sch->dev.groups = default_subch_attr_groups; |
36f6237e SO |
351 | |
352 | if (sch->st == SUBCHANNEL_TYPE_IO) | |
353 | sch->dev.type = &io_subchannel_type; | |
354 | ||
5bf04b20 CH |
355 | /* |
356 | * We don't want to generate uevents for I/O subchannels that don't | |
357 | * have a working ccw device behind them since they will be | |
358 | * unregistered before they can be used anyway, so we delay the add | |
359 | * uevent until after device recognition was successful. | |
7e9db9ea CH |
360 | * Note that we suppress the uevent for all subchannel types; |
361 | * the subchannel driver can decide itself when it wants to inform | |
362 | * userspace of its existence. | |
5bf04b20 | 363 | */ |
f67f129e | 364 | dev_set_uevent_suppress(&sch->dev, 1); |
7ad6a249 | 365 | css_update_ssd_info(sch); |
1da177e4 | 366 | /* make it known to the system */ |
6ab4879a | 367 | ret = css_sch_device_register(sch); |
7674da77 | 368 | if (ret) { |
e556bbbd CH |
369 | CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n", |
370 | sch->schid.ssid, sch->schid.sch_no, ret); | |
7674da77 CH |
371 | return ret; |
372 | } | |
7e9db9ea CH |
373 | if (!sch->driver) { |
374 | /* | |
375 | * No driver matched. Generate the uevent now so that | |
376 | * a fitting driver module may be loaded based on the | |
377 | * modalias. | |
378 | */ | |
f67f129e | 379 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea CH |
380 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
381 | } | |
1da177e4 LT |
382 | return ret; |
383 | } | |
384 | ||
4e5ebd51 | 385 | static int css_probe_device(struct subchannel_id schid) |
1da177e4 | 386 | { |
1da177e4 | 387 | struct subchannel *sch; |
4e5ebd51 | 388 | int ret; |
1da177e4 | 389 | |
14556b33 SO |
390 | sch = css_alloc_subchannel(schid); |
391 | if (IS_ERR(sch)) | |
392 | return PTR_ERR(sch); | |
393 | ||
1da177e4 | 394 | ret = css_register_subchannel(sch); |
863fc849 SO |
395 | if (ret) |
396 | put_device(&sch->dev); | |
397 | ||
1da177e4 LT |
398 | return ret; |
399 | } | |
400 | ||
b0744bd2 CH |
401 | static int |
402 | check_subchannel(struct device * dev, void * data) | |
403 | { | |
404 | struct subchannel *sch; | |
a8237fc4 | 405 | struct subchannel_id *schid = data; |
b0744bd2 CH |
406 | |
407 | sch = to_subchannel(dev); | |
a8237fc4 | 408 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
409 | } |
410 | ||
1da177e4 | 411 | struct subchannel * |
a8237fc4 | 412 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 413 | { |
1da177e4 LT |
414 | struct device *dev; |
415 | ||
b0744bd2 | 416 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 417 | &schid, check_subchannel); |
1da177e4 | 418 | |
b0744bd2 | 419 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
420 | } |
421 | ||
b279a4f5 CH |
422 | /** |
423 | * css_sch_is_valid() - check if a subchannel is valid | |
424 | * @schib: subchannel information block for the subchannel | |
425 | */ | |
426 | int css_sch_is_valid(struct schib *schib) | |
427 | { | |
428 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) | |
429 | return 0; | |
b3a686f4 CH |
430 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) |
431 | return 0; | |
b279a4f5 CH |
432 | return 1; |
433 | } | |
434 | EXPORT_SYMBOL_GPL(css_sch_is_valid); | |
435 | ||
564337f3 PO |
436 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) |
437 | { | |
438 | struct schib schib; | |
439 | ||
440 | if (!slow) { | |
441 | /* Will be done on the slow path. */ | |
442 | return -EAGAIN; | |
443 | } | |
62e65da9 | 444 | if (stsch(schid, &schib)) { |
cec85466 SO |
445 | /* Subchannel is not provided. */ |
446 | return -ENXIO; | |
447 | } | |
448 | if (!css_sch_is_valid(&schib)) { | |
564337f3 PO |
449 | /* Unusable - ignore. */ |
450 | return 0; | |
1da177e4 | 451 | } |
5d6e6b6f PO |
452 | CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new\n", schid.ssid, |
453 | schid.sch_no); | |
564337f3 PO |
454 | |
455 | return css_probe_device(schid); | |
456 | } | |
457 | ||
c820de39 CH |
458 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) |
459 | { | |
460 | int ret = 0; | |
461 | ||
462 | if (sch->driver) { | |
463 | if (sch->driver->sch_event) | |
464 | ret = sch->driver->sch_event(sch, slow); | |
465 | else | |
466 | dev_dbg(&sch->dev, | |
467 | "Got subchannel machine check but " | |
468 | "no sch_event handler provided.\n"); | |
469 | } | |
5d6e6b6f PO |
470 | if (ret != 0 && ret != -EAGAIN) { |
471 | CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n", | |
472 | sch->schid.ssid, sch->schid.sch_no, ret); | |
473 | } | |
c820de39 CH |
474 | return ret; |
475 | } | |
476 | ||
83b3370c | 477 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
478 | { |
479 | struct subchannel *sch; | |
480 | int ret; | |
481 | ||
482 | sch = get_subchannel_by_schid(schid); | |
483 | if (sch) { | |
484 | ret = css_evaluate_known_subchannel(sch, slow); | |
485 | put_device(&sch->dev); | |
486 | } else | |
487 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
488 | if (ret == -EAGAIN) |
489 | css_schedule_eval(schid); | |
1da177e4 LT |
490 | } |
491 | ||
817e5000 SO |
492 | /** |
493 | * css_sched_sch_todo - schedule a subchannel operation | |
494 | * @sch: subchannel | |
495 | * @todo: todo | |
496 | * | |
497 | * Schedule the operation identified by @todo to be performed on the slow path | |
498 | * workqueue. Do nothing if another operation with higher priority is already | |
499 | * scheduled. Needs to be called with subchannel lock held. | |
500 | */ | |
501 | void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo) | |
502 | { | |
503 | CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d\n", | |
504 | sch->schid.ssid, sch->schid.sch_no, todo); | |
505 | if (sch->todo >= todo) | |
506 | return; | |
507 | /* Get workqueue ref. */ | |
508 | if (!get_device(&sch->dev)) | |
509 | return; | |
510 | sch->todo = todo; | |
511 | if (!queue_work(cio_work_q, &sch->todo_work)) { | |
512 | /* Already queued, release workqueue ref. */ | |
513 | put_device(&sch->dev); | |
514 | } | |
515 | } | |
01c5e6dc | 516 | EXPORT_SYMBOL_GPL(css_sched_sch_todo); |
817e5000 SO |
517 | |
518 | static void css_sch_todo(struct work_struct *work) | |
519 | { | |
520 | struct subchannel *sch; | |
521 | enum sch_todo todo; | |
522 | int ret; | |
523 | ||
524 | sch = container_of(work, struct subchannel, todo_work); | |
525 | /* Find out todo. */ | |
526 | spin_lock_irq(sch->lock); | |
527 | todo = sch->todo; | |
528 | CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid, | |
529 | sch->schid.sch_no, todo); | |
530 | sch->todo = SCH_TODO_NOTHING; | |
531 | spin_unlock_irq(sch->lock); | |
532 | /* Perform todo. */ | |
533 | switch (todo) { | |
534 | case SCH_TODO_NOTHING: | |
535 | break; | |
536 | case SCH_TODO_EVAL: | |
537 | ret = css_evaluate_known_subchannel(sch, 1); | |
538 | if (ret == -EAGAIN) { | |
539 | spin_lock_irq(sch->lock); | |
540 | css_sched_sch_todo(sch, todo); | |
541 | spin_unlock_irq(sch->lock); | |
542 | } | |
543 | break; | |
544 | case SCH_TODO_UNREG: | |
545 | css_sch_device_unregister(sch); | |
546 | break; | |
547 | } | |
548 | /* Release workqueue ref. */ | |
549 | put_device(&sch->dev); | |
550 | } | |
551 | ||
83b3370c PO |
552 | static struct idset *slow_subchannel_set; |
553 | static spinlock_t slow_subchannel_lock; | |
25530553 SO |
554 | static wait_queue_head_t css_eval_wq; |
555 | static atomic_t css_eval_scheduled; | |
83b3370c PO |
556 | |
557 | static int __init slow_subchannel_init(void) | |
1da177e4 | 558 | { |
83b3370c | 559 | spin_lock_init(&slow_subchannel_lock); |
25530553 SO |
560 | atomic_set(&css_eval_scheduled, 0); |
561 | init_waitqueue_head(&css_eval_wq); | |
83b3370c PO |
562 | slow_subchannel_set = idset_sch_new(); |
563 | if (!slow_subchannel_set) { | |
e556bbbd | 564 | CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); |
83b3370c PO |
565 | return -ENOMEM; |
566 | } | |
567 | return 0; | |
1da177e4 LT |
568 | } |
569 | ||
e82a1567 | 570 | static int slow_eval_known_fn(struct subchannel *sch, void *data) |
1da177e4 | 571 | { |
e82a1567 PO |
572 | int eval; |
573 | int rc; | |
1da177e4 LT |
574 | |
575 | spin_lock_irq(&slow_subchannel_lock); | |
e82a1567 PO |
576 | eval = idset_sch_contains(slow_subchannel_set, sch->schid); |
577 | idset_sch_del(slow_subchannel_set, sch->schid); | |
578 | spin_unlock_irq(&slow_subchannel_lock); | |
579 | if (eval) { | |
580 | rc = css_evaluate_known_subchannel(sch, 1); | |
581 | if (rc == -EAGAIN) | |
582 | css_schedule_eval(sch->schid); | |
1da177e4 | 583 | } |
e82a1567 PO |
584 | return 0; |
585 | } | |
586 | ||
587 | static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) | |
588 | { | |
589 | int eval; | |
590 | int rc = 0; | |
591 | ||
592 | spin_lock_irq(&slow_subchannel_lock); | |
593 | eval = idset_sch_contains(slow_subchannel_set, schid); | |
594 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 595 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
596 | if (eval) { |
597 | rc = css_evaluate_new_subchannel(schid, 1); | |
598 | switch (rc) { | |
599 | case -EAGAIN: | |
600 | css_schedule_eval(schid); | |
601 | rc = 0; | |
602 | break; | |
603 | case -ENXIO: | |
604 | case -ENOMEM: | |
605 | case -EIO: | |
606 | /* These should abort looping */ | |
eb072a79 | 607 | spin_lock_irq(&slow_subchannel_lock); |
cec85466 | 608 | idset_sch_del_subseq(slow_subchannel_set, schid); |
eb072a79 | 609 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
610 | break; |
611 | default: | |
612 | rc = 0; | |
613 | } | |
b207f5a8 PO |
614 | /* Allow scheduling here since the containing loop might |
615 | * take a while. */ | |
616 | cond_resched(); | |
e82a1567 PO |
617 | } |
618 | return rc; | |
619 | } | |
620 | ||
621 | static void css_slow_path_func(struct work_struct *unused) | |
622 | { | |
25530553 SO |
623 | unsigned long flags; |
624 | ||
e82a1567 PO |
625 | CIO_TRACE_EVENT(4, "slowpath"); |
626 | for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, | |
627 | NULL); | |
25530553 SO |
628 | spin_lock_irqsave(&slow_subchannel_lock, flags); |
629 | if (idset_is_empty(slow_subchannel_set)) { | |
630 | atomic_set(&css_eval_scheduled, 0); | |
631 | wake_up(&css_eval_wq); | |
632 | } | |
633 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
1da177e4 LT |
634 | } |
635 | ||
175746eb | 636 | static DECLARE_DELAYED_WORK(slow_path_work, css_slow_path_func); |
be5d3823 | 637 | struct workqueue_struct *cio_work_q; |
1da177e4 | 638 | |
83b3370c PO |
639 | void css_schedule_eval(struct subchannel_id schid) |
640 | { | |
641 | unsigned long flags; | |
642 | ||
643 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
644 | idset_sch_add(slow_subchannel_set, schid); | |
25530553 | 645 | atomic_set(&css_eval_scheduled, 1); |
175746eb | 646 | queue_delayed_work(cio_work_q, &slow_path_work, 0); |
83b3370c PO |
647 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
648 | } | |
649 | ||
650 | void css_schedule_eval_all(void) | |
651 | { | |
652 | unsigned long flags; | |
653 | ||
654 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
655 | idset_fill(slow_subchannel_set); | |
25530553 | 656 | atomic_set(&css_eval_scheduled, 1); |
175746eb | 657 | queue_delayed_work(cio_work_q, &slow_path_work, 0); |
83b3370c PO |
658 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
659 | } | |
660 | ||
703e5c99 | 661 | static int __unset_registered(struct device *dev, void *data) |
22806dc1 | 662 | { |
703e5c99 SO |
663 | struct idset *set = data; |
664 | struct subchannel *sch = to_subchannel(dev); | |
40154b82 | 665 | |
703e5c99 SO |
666 | idset_sch_del(set, sch->schid); |
667 | return 0; | |
56e25e97 PO |
668 | } |
669 | ||
175746eb | 670 | void css_schedule_eval_all_unreg(unsigned long delay) |
40154b82 | 671 | { |
703e5c99 SO |
672 | unsigned long flags; |
673 | struct idset *unreg_set; | |
40154b82 | 674 | |
703e5c99 SO |
675 | /* Find unregistered subchannels. */ |
676 | unreg_set = idset_sch_new(); | |
677 | if (!unreg_set) { | |
678 | /* Fallback. */ | |
679 | css_schedule_eval_all(); | |
56e25e97 PO |
680 | return; |
681 | } | |
703e5c99 SO |
682 | idset_fill(unreg_set); |
683 | bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered); | |
684 | /* Apply to slow_subchannel_set. */ | |
685 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
686 | idset_add_set(slow_subchannel_set, unreg_set); | |
687 | atomic_set(&css_eval_scheduled, 1); | |
175746eb | 688 | queue_delayed_work(cio_work_q, &slow_path_work, delay); |
703e5c99 SO |
689 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
690 | idset_free(unreg_set); | |
40154b82 PO |
691 | } |
692 | ||
703e5c99 SO |
693 | void css_wait_for_slow_path(void) |
694 | { | |
be5d3823 | 695 | flush_workqueue(cio_work_q); |
703e5c99 | 696 | } |
40154b82 PO |
697 | |
698 | /* Schedule reprobing of all unregistered subchannels. */ | |
699 | void css_schedule_reprobe(void) | |
700 | { | |
175746eb PO |
701 | /* Schedule with a delay to allow merging of subsequent calls. */ |
702 | css_schedule_eval_all_unreg(1 * HZ); | |
40154b82 | 703 | } |
40154b82 PO |
704 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); |
705 | ||
1da177e4 LT |
706 | /* |
707 | * Called from the machine check handler for subchannel report words. | |
708 | */ | |
c1156189 | 709 | static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
1da177e4 | 710 | { |
a8237fc4 | 711 | struct subchannel_id mchk_schid; |
4bc4e965 | 712 | struct subchannel *sch; |
1da177e4 | 713 | |
c1156189 CH |
714 | if (overflow) { |
715 | css_schedule_eval_all(); | |
716 | return; | |
717 | } | |
718 | CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " | |
719 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
720 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
721 | crw0->erc, crw0->rsid); | |
722 | if (crw1) | |
723 | CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " | |
724 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
725 | crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, | |
726 | crw1->anc, crw1->erc, crw1->rsid); | |
a8237fc4 | 727 | init_subchannel_id(&mchk_schid); |
c1156189 CH |
728 | mchk_schid.sch_no = crw0->rsid; |
729 | if (crw1) | |
8d7bfb4a | 730 | mchk_schid.ssid = (crw1->rsid >> 4) & 3; |
fb6958a5 | 731 | |
4bc4e965 SO |
732 | if (crw0->erc == CRW_ERC_PMOD) { |
733 | sch = get_subchannel_by_schid(mchk_schid); | |
734 | if (sch) { | |
735 | css_update_ssd_info(sch); | |
736 | put_device(&sch->dev); | |
737 | } | |
738 | } | |
c1156189 | 739 | /* |
1da177e4 LT |
740 | * Since we are always presented with IPI in the CRW, we have to |
741 | * use stsch() to find out if the subchannel in question has come | |
742 | * or gone. | |
743 | */ | |
83b3370c | 744 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
745 | } |
746 | ||
747 | static void __init | |
a28c6944 | 748 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 749 | { |
94038a99 MS |
750 | struct cpuid cpu_id; |
751 | ||
75784c00 | 752 | if (css_general_characteristics.mcss) { |
a28c6944 | 753 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
e2e0de9b SO |
754 | css->global_pgid.pgid_high.ext_cssid.cssid = |
755 | (css->cssid < 0) ? 0 : css->cssid; | |
a28c6944 | 756 | } else { |
7b468488 | 757 | css->global_pgid.pgid_high.cpu_addr = stap(); |
1da177e4 | 758 | } |
94038a99 MS |
759 | get_cpu_id(&cpu_id); |
760 | css->global_pgid.cpu_id = cpu_id.ident; | |
761 | css->global_pgid.cpu_model = cpu_id.machine; | |
a28c6944 | 762 | css->global_pgid.tod_high = tod_high; |
a28c6944 CH |
763 | } |
764 | ||
15a2044d | 765 | static void channel_subsystem_release(struct device *dev) |
3b793060 | 766 | { |
15a2044d | 767 | struct channel_subsystem *css = to_css(dev); |
3b793060 | 768 | |
495a5b45 | 769 | mutex_destroy(&css->mutex); |
3b793060 CH |
770 | kfree(css); |
771 | } | |
772 | ||
64dfdd4b SO |
773 | static ssize_t real_cssid_show(struct device *dev, struct device_attribute *a, |
774 | char *buf) | |
775 | { | |
776 | struct channel_subsystem *css = to_css(dev); | |
777 | ||
778 | if (css->cssid < 0) | |
779 | return -EINVAL; | |
780 | ||
781 | return sprintf(buf, "%x\n", css->cssid); | |
782 | } | |
783 | static DEVICE_ATTR_RO(real_cssid); | |
784 | ||
6c701268 SO |
785 | static ssize_t cm_enable_show(struct device *dev, struct device_attribute *a, |
786 | char *buf) | |
495a5b45 CH |
787 | { |
788 | struct channel_subsystem *css = to_css(dev); | |
8284fb19 | 789 | int ret; |
495a5b45 | 790 | |
8284fb19 ME |
791 | mutex_lock(&css->mutex); |
792 | ret = sprintf(buf, "%x\n", css->cm_enabled); | |
793 | mutex_unlock(&css->mutex); | |
794 | return ret; | |
495a5b45 CH |
795 | } |
796 | ||
6c701268 SO |
797 | static ssize_t cm_enable_store(struct device *dev, struct device_attribute *a, |
798 | const char *buf, size_t count) | |
495a5b45 CH |
799 | { |
800 | struct channel_subsystem *css = to_css(dev); | |
2f972202 | 801 | unsigned long val; |
6c701268 | 802 | int ret; |
495a5b45 | 803 | |
0178722b | 804 | ret = kstrtoul(buf, 16, &val); |
2f972202 CH |
805 | if (ret) |
806 | return ret; | |
8284fb19 | 807 | mutex_lock(&css->mutex); |
2f972202 CH |
808 | switch (val) { |
809 | case 0: | |
495a5b45 CH |
810 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; |
811 | break; | |
2f972202 | 812 | case 1: |
495a5b45 CH |
813 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); |
814 | break; | |
815 | default: | |
816 | ret = -EINVAL; | |
817 | } | |
8284fb19 | 818 | mutex_unlock(&css->mutex); |
495a5b45 CH |
819 | return ret < 0 ? ret : count; |
820 | } | |
6c701268 SO |
821 | static DEVICE_ATTR_RW(cm_enable); |
822 | ||
823 | static umode_t cm_enable_mode(struct kobject *kobj, struct attribute *attr, | |
824 | int index) | |
825 | { | |
826 | return css_chsc_characteristics.secm ? attr->mode : 0; | |
827 | } | |
828 | ||
64dfdd4b SO |
829 | static struct attribute *cssdev_attrs[] = { |
830 | &dev_attr_real_cssid.attr, | |
831 | NULL, | |
832 | }; | |
833 | ||
834 | static struct attribute_group cssdev_attr_group = { | |
835 | .attrs = cssdev_attrs, | |
836 | }; | |
837 | ||
6c701268 SO |
838 | static struct attribute *cssdev_cm_attrs[] = { |
839 | &dev_attr_cm_enable.attr, | |
840 | NULL, | |
841 | }; | |
842 | ||
843 | static struct attribute_group cssdev_cm_attr_group = { | |
844 | .attrs = cssdev_cm_attrs, | |
845 | .is_visible = cm_enable_mode, | |
846 | }; | |
495a5b45 | 847 | |
6c701268 | 848 | static const struct attribute_group *cssdev_attr_groups[] = { |
64dfdd4b | 849 | &cssdev_attr_group, |
6c701268 SO |
850 | &cssdev_cm_attr_group, |
851 | NULL, | |
852 | }; | |
495a5b45 | 853 | |
4d284cac | 854 | static int __init setup_css(int nr) |
a28c6944 | 855 | { |
7c9f4e3a | 856 | struct channel_subsystem *css; |
15a2044d | 857 | int ret; |
a28c6944 | 858 | |
15a2044d SO |
859 | css = kzalloc(sizeof(*css), GFP_KERNEL); |
860 | if (!css) | |
d7b5a4c9 | 861 | return -ENOMEM; |
15a2044d SO |
862 | |
863 | channel_subsystems[nr] = css; | |
864 | dev_set_name(&css->device, "css%x", nr); | |
865 | css->device.groups = cssdev_attr_groups; | |
866 | css->device.release = channel_subsystem_release; | |
867 | ||
868 | mutex_init(&css->mutex); | |
15a2044d SO |
869 | css->cssid = chsc_get_cssid(nr); |
870 | css_generate_pgid(css, (u32) (get_tod_clock() >> 32)); | |
871 | ||
872 | ret = device_register(&css->device); | |
873 | if (ret) { | |
874 | put_device(&css->device); | |
875 | goto out_err; | |
876 | } | |
877 | ||
878 | css->pseudo_subchannel = kzalloc(sizeof(*css->pseudo_subchannel), | |
879 | GFP_KERNEL); | |
880 | if (!css->pseudo_subchannel) { | |
881 | device_unregister(&css->device); | |
882 | ret = -ENOMEM; | |
883 | goto out_err; | |
884 | } | |
885 | ||
7c9f4e3a CH |
886 | css->pseudo_subchannel->dev.parent = &css->device; |
887 | css->pseudo_subchannel->dev.release = css_subchannel_release; | |
5d6e6b6f | 888 | mutex_init(&css->pseudo_subchannel->reg_mutex); |
e5dcf002 | 889 | ret = css_sch_create_locks(css->pseudo_subchannel); |
d7b5a4c9 | 890 | if (ret) { |
7c9f4e3a | 891 | kfree(css->pseudo_subchannel); |
15a2044d SO |
892 | device_unregister(&css->device); |
893 | goto out_err; | |
d7b5a4c9 | 894 | } |
e2e0de9b | 895 | |
15a2044d SO |
896 | dev_set_name(&css->pseudo_subchannel->dev, "defunct"); |
897 | ret = device_register(&css->pseudo_subchannel->dev); | |
898 | if (ret) { | |
899 | put_device(&css->pseudo_subchannel->dev); | |
900 | device_unregister(&css->device); | |
901 | goto out_err; | |
902 | } | |
903 | ||
904 | return ret; | |
905 | out_err: | |
906 | channel_subsystems[nr] = NULL; | |
907 | return ret; | |
1da177e4 LT |
908 | } |
909 | ||
a55360df CH |
910 | static int css_reboot_event(struct notifier_block *this, |
911 | unsigned long event, | |
912 | void *ptr) | |
913 | { | |
98cc43ab SO |
914 | struct channel_subsystem *css; |
915 | int ret; | |
a55360df CH |
916 | |
917 | ret = NOTIFY_DONE; | |
98cc43ab | 918 | for_each_css(css) { |
8284fb19 | 919 | mutex_lock(&css->mutex); |
a55360df CH |
920 | if (css->cm_enabled) |
921 | if (chsc_secm(css, 0)) | |
922 | ret = NOTIFY_BAD; | |
8284fb19 | 923 | mutex_unlock(&css->mutex); |
a55360df CH |
924 | } |
925 | ||
926 | return ret; | |
927 | } | |
928 | ||
929 | static struct notifier_block css_reboot_notifier = { | |
930 | .notifier_call = css_reboot_event, | |
931 | }; | |
932 | ||
dcbd16d5 SO |
933 | /* |
934 | * Since the css devices are neither on a bus nor have a class | |
935 | * nor have a special device type, we cannot stop/restart channel | |
936 | * path measurements via the normal suspend/resume callbacks, but have | |
937 | * to use notifiers. | |
938 | */ | |
939 | static int css_power_event(struct notifier_block *this, unsigned long event, | |
940 | void *ptr) | |
941 | { | |
98cc43ab SO |
942 | struct channel_subsystem *css; |
943 | int ret; | |
dcbd16d5 SO |
944 | |
945 | switch (event) { | |
946 | case PM_HIBERNATION_PREPARE: | |
947 | case PM_SUSPEND_PREPARE: | |
948 | ret = NOTIFY_DONE; | |
98cc43ab | 949 | for_each_css(css) { |
dcbd16d5 SO |
950 | mutex_lock(&css->mutex); |
951 | if (!css->cm_enabled) { | |
952 | mutex_unlock(&css->mutex); | |
953 | continue; | |
954 | } | |
f0c077a8 AM |
955 | ret = __chsc_do_secm(css, 0); |
956 | ret = notifier_from_errno(ret); | |
dcbd16d5 SO |
957 | mutex_unlock(&css->mutex); |
958 | } | |
959 | break; | |
960 | case PM_POST_HIBERNATION: | |
961 | case PM_POST_SUSPEND: | |
962 | ret = NOTIFY_DONE; | |
98cc43ab | 963 | for_each_css(css) { |
dcbd16d5 SO |
964 | mutex_lock(&css->mutex); |
965 | if (!css->cm_enabled) { | |
966 | mutex_unlock(&css->mutex); | |
967 | continue; | |
968 | } | |
f0c077a8 AM |
969 | ret = __chsc_do_secm(css, 1); |
970 | ret = notifier_from_errno(ret); | |
dcbd16d5 SO |
971 | mutex_unlock(&css->mutex); |
972 | } | |
973 | /* search for subchannels, which appeared during hibernation */ | |
974 | css_schedule_reprobe(); | |
975 | break; | |
976 | default: | |
977 | ret = NOTIFY_DONE; | |
978 | } | |
979 | return ret; | |
980 | ||
981 | } | |
982 | static struct notifier_block css_power_notifier = { | |
983 | .notifier_call = css_power_event, | |
984 | }; | |
985 | ||
1da177e4 LT |
986 | /* |
987 | * Now that the driver core is running, we can setup our channel subsystem. | |
14556b33 | 988 | * The struct subchannel's are created during probing. |
1da177e4 | 989 | */ |
2f17644d | 990 | static int __init css_bus_init(void) |
1da177e4 | 991 | { |
a28c6944 | 992 | int ret, i; |
1da177e4 | 993 | |
34aec07c SO |
994 | ret = chsc_init(); |
995 | if (ret) | |
996 | return ret; | |
997 | ||
34196f82 | 998 | chsc_determine_css_characteristics(); |
b0a285d3 SO |
999 | /* Try to enable MSS. */ |
1000 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
818c272b | 1001 | if (ret) |
b0a285d3 | 1002 | max_ssid = 0; |
818c272b SO |
1003 | else /* Success. */ |
1004 | max_ssid = __MAX_SSID; | |
b0a285d3 | 1005 | |
4434a38c CH |
1006 | ret = slow_subchannel_init(); |
1007 | if (ret) | |
1008 | goto out; | |
1009 | ||
f5daba1d | 1010 | ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); |
c1156189 CH |
1011 | if (ret) |
1012 | goto out; | |
1013 | ||
1da177e4 LT |
1014 | if ((ret = bus_register(&css_bus_type))) |
1015 | goto out; | |
1da177e4 | 1016 | |
a28c6944 | 1017 | /* Setup css structure. */ |
98cc43ab | 1018 | for (i = 0; i <= MAX_CSS_IDX; i++) { |
d7b5a4c9 | 1019 | ret = setup_css(i); |
15a2044d | 1020 | if (ret) |
a2164b81 | 1021 | goto out_unregister; |
a28c6944 | 1022 | } |
a55360df CH |
1023 | ret = register_reboot_notifier(&css_reboot_notifier); |
1024 | if (ret) | |
a2164b81 | 1025 | goto out_unregister; |
dcbd16d5 SO |
1026 | ret = register_pm_notifier(&css_power_notifier); |
1027 | if (ret) { | |
1028 | unregister_reboot_notifier(&css_reboot_notifier); | |
1029 | goto out_unregister; | |
1030 | } | |
1da177e4 LT |
1031 | css_init_done = 1; |
1032 | ||
3a3fc29a | 1033 | /* Enable default isc for I/O subchannels. */ |
6ef556cc | 1034 | isc_register(IO_SCH_ISC); |
1da177e4 | 1035 | |
1da177e4 | 1036 | return 0; |
fb6958a5 | 1037 | out_unregister: |
15a2044d SO |
1038 | while (i-- > 0) { |
1039 | struct channel_subsystem *css = channel_subsystems[i]; | |
7c9f4e3a | 1040 | device_unregister(&css->pseudo_subchannel->dev); |
7c9f4e3a | 1041 | device_unregister(&css->device); |
a28c6944 | 1042 | } |
1da177e4 LT |
1043 | bus_unregister(&css_bus_type); |
1044 | out: | |
34aec07c | 1045 | crw_unregister_handler(CRW_RSC_SCH); |
b827d1c8 | 1046 | idset_free(slow_subchannel_set); |
34aec07c | 1047 | chsc_init_cleanup(); |
e6d5a428 ME |
1048 | pr_alert("The CSS device driver initialization failed with " |
1049 | "errno=%d\n", ret); | |
1da177e4 LT |
1050 | return ret; |
1051 | } | |
1052 | ||
2f17644d SO |
1053 | static void __init css_bus_cleanup(void) |
1054 | { | |
1055 | struct channel_subsystem *css; | |
2f17644d | 1056 | |
98cc43ab | 1057 | for_each_css(css) { |
2f17644d | 1058 | device_unregister(&css->pseudo_subchannel->dev); |
2f17644d SO |
1059 | device_unregister(&css->device); |
1060 | } | |
1061 | bus_unregister(&css_bus_type); | |
34aec07c | 1062 | crw_unregister_handler(CRW_RSC_SCH); |
b827d1c8 | 1063 | idset_free(slow_subchannel_set); |
34aec07c | 1064 | chsc_init_cleanup(); |
2f17644d SO |
1065 | isc_unregister(IO_SCH_ISC); |
1066 | } | |
1067 | ||
1068 | static int __init channel_subsystem_init(void) | |
1069 | { | |
1070 | int ret; | |
1071 | ||
1072 | ret = css_bus_init(); | |
1073 | if (ret) | |
1074 | return ret; | |
be5d3823 SO |
1075 | cio_work_q = create_singlethread_workqueue("cio"); |
1076 | if (!cio_work_q) { | |
1077 | ret = -ENOMEM; | |
1078 | goto out_bus; | |
1079 | } | |
2f17644d SO |
1080 | ret = io_subchannel_init(); |
1081 | if (ret) | |
be5d3823 | 1082 | goto out_wq; |
2f17644d SO |
1083 | |
1084 | return ret; | |
be5d3823 SO |
1085 | out_wq: |
1086 | destroy_workqueue(cio_work_q); | |
1087 | out_bus: | |
1088 | css_bus_cleanup(); | |
1089 | return ret; | |
2f17644d SO |
1090 | } |
1091 | subsys_initcall(channel_subsystem_init); | |
1092 | ||
8ea7f559 SO |
1093 | static int css_settle(struct device_driver *drv, void *unused) |
1094 | { | |
1095 | struct css_driver *cssdrv = to_cssdriver(drv); | |
1096 | ||
1097 | if (cssdrv->settle) | |
b4c70721 | 1098 | return cssdrv->settle(); |
8ea7f559 SO |
1099 | return 0; |
1100 | } | |
1101 | ||
0d01bb89 | 1102 | int css_complete_work(void) |
879acca5 SO |
1103 | { |
1104 | int ret; | |
1105 | ||
1106 | /* Wait for the evaluation of subchannels to finish. */ | |
b4c70721 SO |
1107 | ret = wait_event_interruptible(css_eval_wq, |
1108 | atomic_read(&css_eval_scheduled) == 0); | |
1109 | if (ret) | |
1110 | return -EINTR; | |
879acca5 SO |
1111 | flush_workqueue(cio_work_q); |
1112 | /* Wait for the subchannel type specific initialization to finish */ | |
b4c70721 | 1113 | return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle); |
879acca5 SO |
1114 | } |
1115 | ||
1116 | ||
2f17644d SO |
1117 | /* |
1118 | * Wait for the initialization of devices to finish, to make sure we are | |
1119 | * done with our setup if the search for the root device starts. | |
1120 | */ | |
1121 | static int __init channel_subsystem_init_sync(void) | |
1122 | { | |
14556b33 SO |
1123 | /* Register subchannels which are already in use. */ |
1124 | cio_register_early_subchannels(); | |
703e5c99 SO |
1125 | /* Start initial subchannel evaluation. */ |
1126 | css_schedule_eval_all(); | |
879acca5 SO |
1127 | css_complete_work(); |
1128 | return 0; | |
2f17644d SO |
1129 | } |
1130 | subsys_initcall_sync(channel_subsystem_init_sync); | |
1131 | ||
889ee955 SO |
1132 | void channel_subsystem_reinit(void) |
1133 | { | |
62da177a SO |
1134 | struct channel_path *chp; |
1135 | struct chp_id chpid; | |
1136 | ||
889ee955 | 1137 | chsc_enable_facility(CHSC_SDA_OC_MSS); |
62da177a SO |
1138 | chp_id_for_each(&chpid) { |
1139 | chp = chpid_to_chp(chpid); | |
cce0eacc PO |
1140 | if (chp) |
1141 | chp_update_desc(chp); | |
62da177a | 1142 | } |
ab97d211 | 1143 | cmf_reactivate(); |
889ee955 SO |
1144 | } |
1145 | ||
879acca5 SO |
1146 | #ifdef CONFIG_PROC_FS |
1147 | static ssize_t cio_settle_write(struct file *file, const char __user *buf, | |
1148 | size_t count, loff_t *ppos) | |
1149 | { | |
b4c70721 SO |
1150 | int ret; |
1151 | ||
879acca5 SO |
1152 | /* Handle pending CRW's. */ |
1153 | crw_wait_for_channel_report(); | |
b4c70721 SO |
1154 | ret = css_complete_work(); |
1155 | ||
1156 | return ret ? ret : count; | |
879acca5 SO |
1157 | } |
1158 | ||
1159 | static const struct file_operations cio_settle_proc_fops = { | |
58ea91c0 | 1160 | .open = nonseekable_open, |
879acca5 | 1161 | .write = cio_settle_write, |
6038f373 | 1162 | .llseek = no_llseek, |
879acca5 SO |
1163 | }; |
1164 | ||
1165 | static int __init cio_settle_init(void) | |
1166 | { | |
1167 | struct proc_dir_entry *entry; | |
1168 | ||
1169 | entry = proc_create("cio_settle", S_IWUSR, NULL, | |
1170 | &cio_settle_proc_fops); | |
1171 | if (!entry) | |
1172 | return -ENOMEM; | |
1173 | return 0; | |
1174 | } | |
1175 | device_initcall(cio_settle_init); | |
1176 | #endif /*CONFIG_PROC_FS*/ | |
1177 | ||
d7b5a4c9 CH |
1178 | int sch_is_pseudo_sch(struct subchannel *sch) |
1179 | { | |
1180 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
1181 | } | |
1182 | ||
f08adc00 | 1183 | static int css_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1184 | { |
084325d8 CH |
1185 | struct subchannel *sch = to_subchannel(dev); |
1186 | struct css_driver *driver = to_cssdriver(drv); | |
f08adc00 | 1187 | struct css_device_id *id; |
1da177e4 | 1188 | |
f08adc00 CH |
1189 | for (id = driver->subchannel_type; id->match_flags; id++) { |
1190 | if (sch->st == id->type) | |
1191 | return 1; | |
1192 | } | |
1da177e4 LT |
1193 | |
1194 | return 0; | |
1195 | } | |
1196 | ||
98c13c28 | 1197 | static int css_probe(struct device *dev) |
8bbace7e CH |
1198 | { |
1199 | struct subchannel *sch; | |
98c13c28 | 1200 | int ret; |
8bbace7e CH |
1201 | |
1202 | sch = to_subchannel(dev); | |
084325d8 | 1203 | sch->driver = to_cssdriver(dev->driver); |
98c13c28 CH |
1204 | ret = sch->driver->probe ? sch->driver->probe(sch) : 0; |
1205 | if (ret) | |
1206 | sch->driver = NULL; | |
1207 | return ret; | |
8bbace7e CH |
1208 | } |
1209 | ||
98c13c28 | 1210 | static int css_remove(struct device *dev) |
8bbace7e CH |
1211 | { |
1212 | struct subchannel *sch; | |
98c13c28 | 1213 | int ret; |
8bbace7e CH |
1214 | |
1215 | sch = to_subchannel(dev); | |
98c13c28 CH |
1216 | ret = sch->driver->remove ? sch->driver->remove(sch) : 0; |
1217 | sch->driver = NULL; | |
1218 | return ret; | |
8bbace7e CH |
1219 | } |
1220 | ||
98c13c28 | 1221 | static void css_shutdown(struct device *dev) |
8bbace7e CH |
1222 | { |
1223 | struct subchannel *sch; | |
1224 | ||
1225 | sch = to_subchannel(dev); | |
98c13c28 | 1226 | if (sch->driver && sch->driver->shutdown) |
8bbace7e CH |
1227 | sch->driver->shutdown(sch); |
1228 | } | |
1229 | ||
7e9db9ea CH |
1230 | static int css_uevent(struct device *dev, struct kobj_uevent_env *env) |
1231 | { | |
1232 | struct subchannel *sch = to_subchannel(dev); | |
1233 | int ret; | |
1234 | ||
1235 | ret = add_uevent_var(env, "ST=%01X", sch->st); | |
1236 | if (ret) | |
1237 | return ret; | |
1238 | ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); | |
1239 | return ret; | |
1240 | } | |
1241 | ||
dcbd16d5 SO |
1242 | static int css_pm_prepare(struct device *dev) |
1243 | { | |
1244 | struct subchannel *sch = to_subchannel(dev); | |
1245 | struct css_driver *drv; | |
1246 | ||
1247 | if (mutex_is_locked(&sch->reg_mutex)) | |
1248 | return -EAGAIN; | |
1249 | if (!sch->dev.driver) | |
1250 | return 0; | |
1251 | drv = to_cssdriver(sch->dev.driver); | |
1252 | /* Notify drivers that they may not register children. */ | |
1253 | return drv->prepare ? drv->prepare(sch) : 0; | |
1254 | } | |
1255 | ||
1256 | static void css_pm_complete(struct device *dev) | |
1257 | { | |
1258 | struct subchannel *sch = to_subchannel(dev); | |
1259 | struct css_driver *drv; | |
1260 | ||
1261 | if (!sch->dev.driver) | |
1262 | return; | |
1263 | drv = to_cssdriver(sch->dev.driver); | |
1264 | if (drv->complete) | |
1265 | drv->complete(sch); | |
1266 | } | |
1267 | ||
1268 | static int css_pm_freeze(struct device *dev) | |
1269 | { | |
1270 | struct subchannel *sch = to_subchannel(dev); | |
1271 | struct css_driver *drv; | |
1272 | ||
1273 | if (!sch->dev.driver) | |
1274 | return 0; | |
1275 | drv = to_cssdriver(sch->dev.driver); | |
1276 | return drv->freeze ? drv->freeze(sch) : 0; | |
1277 | } | |
1278 | ||
1279 | static int css_pm_thaw(struct device *dev) | |
1280 | { | |
1281 | struct subchannel *sch = to_subchannel(dev); | |
1282 | struct css_driver *drv; | |
1283 | ||
1284 | if (!sch->dev.driver) | |
1285 | return 0; | |
1286 | drv = to_cssdriver(sch->dev.driver); | |
1287 | return drv->thaw ? drv->thaw(sch) : 0; | |
1288 | } | |
1289 | ||
1290 | static int css_pm_restore(struct device *dev) | |
1291 | { | |
1292 | struct subchannel *sch = to_subchannel(dev); | |
1293 | struct css_driver *drv; | |
1294 | ||
eb4f5d93 | 1295 | css_update_ssd_info(sch); |
dcbd16d5 SO |
1296 | if (!sch->dev.driver) |
1297 | return 0; | |
1298 | drv = to_cssdriver(sch->dev.driver); | |
1299 | return drv->restore ? drv->restore(sch) : 0; | |
1300 | } | |
1301 | ||
47145210 | 1302 | static const struct dev_pm_ops css_pm_ops = { |
dcbd16d5 SO |
1303 | .prepare = css_pm_prepare, |
1304 | .complete = css_pm_complete, | |
1305 | .freeze = css_pm_freeze, | |
1306 | .thaw = css_pm_thaw, | |
1307 | .restore = css_pm_restore, | |
1308 | }; | |
1309 | ||
3041b6ab | 1310 | static struct bus_type css_bus_type = { |
8bbace7e CH |
1311 | .name = "css", |
1312 | .match = css_bus_match, | |
1313 | .probe = css_probe, | |
1314 | .remove = css_remove, | |
1315 | .shutdown = css_shutdown, | |
7e9db9ea | 1316 | .uevent = css_uevent, |
dcbd16d5 | 1317 | .pm = &css_pm_ops, |
1da177e4 LT |
1318 | }; |
1319 | ||
25b7bb58 CH |
1320 | /** |
1321 | * css_driver_register - register a css driver | |
1322 | * @cdrv: css driver to register | |
1323 | * | |
1324 | * This is mainly a wrapper around driver_register that sets name | |
1325 | * and bus_type in the embedded struct device_driver correctly. | |
1326 | */ | |
1327 | int css_driver_register(struct css_driver *cdrv) | |
1328 | { | |
25b7bb58 CH |
1329 | cdrv->drv.bus = &css_bus_type; |
1330 | return driver_register(&cdrv->drv); | |
1331 | } | |
1332 | EXPORT_SYMBOL_GPL(css_driver_register); | |
1333 | ||
1334 | /** | |
1335 | * css_driver_unregister - unregister a css driver | |
1336 | * @cdrv: css driver to unregister | |
1337 | * | |
1338 | * This is a wrapper around driver_unregister. | |
1339 | */ | |
1340 | void css_driver_unregister(struct css_driver *cdrv) | |
1341 | { | |
1342 | driver_unregister(&cdrv->drv); | |
1343 | } | |
1344 | EXPORT_SYMBOL_GPL(css_driver_unregister); |