Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
dcbd16d5 | 2 | * driver for channel subsystem |
1da177e4 | 3 | * |
34aec07c | 4 | * Copyright IBM Corp. 2002, 2010 |
dcbd16d5 SO |
5 | * |
6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
7 | * Cornelia Huck (cornelia.huck@de.ibm.com) | |
1da177e4 | 8 | */ |
e6d5a428 ME |
9 | |
10 | #define KMSG_COMPONENT "cio" | |
11 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
12 | ||
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/list.h> | |
a55360df | 19 | #include <linux/reboot.h> |
dcbd16d5 | 20 | #include <linux/suspend.h> |
879acca5 | 21 | #include <linux/proc_fs.h> |
3a3fc29a | 22 | #include <asm/isc.h> |
f5daba1d | 23 | #include <asm/crw.h> |
1da177e4 LT |
24 | |
25 | #include "css.h" | |
26 | #include "cio.h" | |
27 | #include "cio_debug.h" | |
28 | #include "ioasm.h" | |
29 | #include "chsc.h" | |
40154b82 | 30 | #include "device.h" |
83b3370c | 31 | #include "idset.h" |
7ad6a249 | 32 | #include "chp.h" |
1da177e4 | 33 | |
1da177e4 | 34 | int css_init_done = 0; |
b0a285d3 | 35 | int max_ssid; |
1da177e4 | 36 | |
7c9f4e3a | 37 | struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1]; |
3041b6ab | 38 | static struct bus_type css_bus_type; |
1da177e4 | 39 | |
4d284cac | 40 | int |
f97a56fb CH |
41 | for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) |
42 | { | |
43 | struct subchannel_id schid; | |
44 | int ret; | |
45 | ||
46 | init_subchannel_id(&schid); | |
47 | ret = -ENODEV; | |
48 | do { | |
fb6958a5 CH |
49 | do { |
50 | ret = fn(schid, data); | |
51 | if (ret) | |
52 | break; | |
53 | } while (schid.sch_no++ < __MAX_SUBCHANNEL); | |
54 | schid.sch_no = 0; | |
55 | } while (schid.ssid++ < max_ssid); | |
f97a56fb CH |
56 | return ret; |
57 | } | |
58 | ||
e82a1567 PO |
59 | struct cb_data { |
60 | void *data; | |
61 | struct idset *set; | |
62 | int (*fn_known_sch)(struct subchannel *, void *); | |
63 | int (*fn_unknown_sch)(struct subchannel_id, void *); | |
64 | }; | |
65 | ||
66 | static int call_fn_known_sch(struct device *dev, void *data) | |
67 | { | |
68 | struct subchannel *sch = to_subchannel(dev); | |
69 | struct cb_data *cb = data; | |
70 | int rc = 0; | |
71 | ||
72 | idset_sch_del(cb->set, sch->schid); | |
73 | if (cb->fn_known_sch) | |
74 | rc = cb->fn_known_sch(sch, cb->data); | |
75 | return rc; | |
76 | } | |
77 | ||
78 | static int call_fn_unknown_sch(struct subchannel_id schid, void *data) | |
79 | { | |
80 | struct cb_data *cb = data; | |
81 | int rc = 0; | |
82 | ||
83 | if (idset_sch_contains(cb->set, schid)) | |
84 | rc = cb->fn_unknown_sch(schid, cb->data); | |
85 | return rc; | |
86 | } | |
87 | ||
90ac24a5 SO |
88 | static int call_fn_all_sch(struct subchannel_id schid, void *data) |
89 | { | |
90 | struct cb_data *cb = data; | |
91 | struct subchannel *sch; | |
92 | int rc = 0; | |
93 | ||
94 | sch = get_subchannel_by_schid(schid); | |
95 | if (sch) { | |
96 | if (cb->fn_known_sch) | |
97 | rc = cb->fn_known_sch(sch, cb->data); | |
98 | put_device(&sch->dev); | |
99 | } else { | |
100 | if (cb->fn_unknown_sch) | |
101 | rc = cb->fn_unknown_sch(schid, cb->data); | |
102 | } | |
103 | ||
104 | return rc; | |
105 | } | |
106 | ||
e82a1567 PO |
107 | int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), |
108 | int (*fn_unknown)(struct subchannel_id, | |
109 | void *), void *data) | |
110 | { | |
111 | struct cb_data cb; | |
112 | int rc; | |
113 | ||
e82a1567 PO |
114 | cb.data = data; |
115 | cb.fn_known_sch = fn_known; | |
116 | cb.fn_unknown_sch = fn_unknown; | |
90ac24a5 SO |
117 | |
118 | cb.set = idset_sch_new(); | |
119 | if (!cb.set) | |
120 | /* fall back to brute force scanning in case of oom */ | |
121 | return for_each_subchannel(call_fn_all_sch, &cb); | |
122 | ||
123 | idset_fill(cb.set); | |
124 | ||
e82a1567 PO |
125 | /* Process registered subchannels. */ |
126 | rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); | |
127 | if (rc) | |
128 | goto out; | |
129 | /* Process unregistered subchannels. */ | |
130 | if (fn_unknown) | |
131 | rc = for_each_subchannel(call_fn_unknown_sch, &cb); | |
132 | out: | |
133 | idset_free(cb.set); | |
134 | ||
135 | return rc; | |
136 | } | |
137 | ||
390935ac PO |
138 | static void css_sch_todo(struct work_struct *work); |
139 | ||
c135ad1c SO |
140 | static void css_subchannel_release(struct device *dev) |
141 | { | |
863fc849 | 142 | struct subchannel *sch = to_subchannel(dev); |
c135ad1c | 143 | |
863fc849 SO |
144 | sch->config.intparm = 0; |
145 | cio_commit_config(sch); | |
146 | kfree(sch->lock); | |
147 | kfree(sch); | |
c135ad1c SO |
148 | } |
149 | ||
863fc849 | 150 | struct subchannel *css_alloc_subchannel(struct subchannel_id schid) |
1da177e4 LT |
151 | { |
152 | struct subchannel *sch; | |
153 | int ret; | |
154 | ||
155 | sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA); | |
156 | if (sch == NULL) | |
157 | return ERR_PTR(-ENOMEM); | |
a8237fc4 | 158 | ret = cio_validate_subchannel (sch, schid); |
1da177e4 LT |
159 | if (ret < 0) { |
160 | kfree(sch); | |
161 | return ERR_PTR(ret); | |
162 | } | |
390935ac | 163 | INIT_WORK(&sch->todo_work, css_sch_todo); |
c135ad1c SO |
164 | sch->dev.release = &css_subchannel_release; |
165 | device_initialize(&sch->dev); | |
1da177e4 LT |
166 | return sch; |
167 | } | |
168 | ||
07c6a338 | 169 | static int css_sch_device_register(struct subchannel *sch) |
6ab4879a CH |
170 | { |
171 | int ret; | |
172 | ||
173 | mutex_lock(&sch->reg_mutex); | |
6ee4fec6 SO |
174 | dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, |
175 | sch->schid.sch_no); | |
c135ad1c | 176 | ret = device_add(&sch->dev); |
6ab4879a CH |
177 | mutex_unlock(&sch->reg_mutex); |
178 | return ret; | |
179 | } | |
180 | ||
44a1c19e CH |
181 | /** |
182 | * css_sch_device_unregister - unregister a subchannel | |
183 | * @sch: subchannel to be unregistered | |
184 | */ | |
6ab4879a CH |
185 | void css_sch_device_unregister(struct subchannel *sch) |
186 | { | |
187 | mutex_lock(&sch->reg_mutex); | |
ef60cd13 SO |
188 | if (device_is_registered(&sch->dev)) |
189 | device_unregister(&sch->dev); | |
6ab4879a CH |
190 | mutex_unlock(&sch->reg_mutex); |
191 | } | |
44a1c19e | 192 | EXPORT_SYMBOL_GPL(css_sch_device_unregister); |
6ab4879a | 193 | |
7ad6a249 PO |
194 | static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) |
195 | { | |
196 | int i; | |
197 | int mask; | |
198 | ||
199 | memset(ssd, 0, sizeof(struct chsc_ssd_info)); | |
200 | ssd->path_mask = pmcw->pim; | |
201 | for (i = 0; i < 8; i++) { | |
202 | mask = 0x80 >> i; | |
203 | if (pmcw->pim & mask) { | |
204 | chp_id_init(&ssd->chpid[i]); | |
205 | ssd->chpid[i].id = pmcw->chpid[i]; | |
206 | } | |
207 | } | |
208 | } | |
209 | ||
210 | static void ssd_register_chpids(struct chsc_ssd_info *ssd) | |
211 | { | |
212 | int i; | |
213 | int mask; | |
214 | ||
215 | for (i = 0; i < 8; i++) { | |
216 | mask = 0x80 >> i; | |
217 | if (ssd->path_mask & mask) | |
218 | if (!chp_is_registered(ssd->chpid[i])) | |
219 | chp_new(ssd->chpid[i]); | |
220 | } | |
221 | } | |
222 | ||
223 | void css_update_ssd_info(struct subchannel *sch) | |
224 | { | |
225 | int ret; | |
226 | ||
14556b33 SO |
227 | ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); |
228 | if (ret) | |
7ad6a249 | 229 | ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); |
14556b33 SO |
230 | |
231 | ssd_register_chpids(&sch->ssd_info); | |
7ad6a249 PO |
232 | } |
233 | ||
7e9db9ea CH |
234 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
235 | char *buf) | |
236 | { | |
237 | struct subchannel *sch = to_subchannel(dev); | |
238 | ||
239 | return sprintf(buf, "%01x\n", sch->st); | |
240 | } | |
241 | ||
242 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
243 | ||
244 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
245 | char *buf) | |
246 | { | |
247 | struct subchannel *sch = to_subchannel(dev); | |
248 | ||
249 | return sprintf(buf, "css:t%01X\n", sch->st); | |
250 | } | |
251 | ||
252 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); | |
253 | ||
254 | static struct attribute *subch_attrs[] = { | |
255 | &dev_attr_type.attr, | |
256 | &dev_attr_modalias.attr, | |
257 | NULL, | |
258 | }; | |
259 | ||
260 | static struct attribute_group subch_attr_group = { | |
261 | .attrs = subch_attrs, | |
262 | }; | |
263 | ||
a4dbd674 | 264 | static const struct attribute_group *default_subch_attr_groups[] = { |
7e9db9ea CH |
265 | &subch_attr_group, |
266 | NULL, | |
267 | }; | |
268 | ||
14556b33 | 269 | int css_register_subchannel(struct subchannel *sch) |
1da177e4 LT |
270 | { |
271 | int ret; | |
272 | ||
273 | /* Initialize the subchannel structure */ | |
7c9f4e3a | 274 | sch->dev.parent = &channel_subsystems[0]->device; |
1da177e4 | 275 | sch->dev.bus = &css_bus_type; |
7e9db9ea | 276 | sch->dev.groups = default_subch_attr_groups; |
5bf04b20 CH |
277 | /* |
278 | * We don't want to generate uevents for I/O subchannels that don't | |
279 | * have a working ccw device behind them since they will be | |
280 | * unregistered before they can be used anyway, so we delay the add | |
281 | * uevent until after device recognition was successful. | |
7e9db9ea CH |
282 | * Note that we suppress the uevent for all subchannel types; |
283 | * the subchannel driver can decide itself when it wants to inform | |
284 | * userspace of its existence. | |
5bf04b20 | 285 | */ |
f67f129e | 286 | dev_set_uevent_suppress(&sch->dev, 1); |
7ad6a249 | 287 | css_update_ssd_info(sch); |
1da177e4 | 288 | /* make it known to the system */ |
6ab4879a | 289 | ret = css_sch_device_register(sch); |
7674da77 | 290 | if (ret) { |
e556bbbd CH |
291 | CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n", |
292 | sch->schid.ssid, sch->schid.sch_no, ret); | |
7674da77 CH |
293 | return ret; |
294 | } | |
7e9db9ea CH |
295 | if (!sch->driver) { |
296 | /* | |
297 | * No driver matched. Generate the uevent now so that | |
298 | * a fitting driver module may be loaded based on the | |
299 | * modalias. | |
300 | */ | |
f67f129e | 301 | dev_set_uevent_suppress(&sch->dev, 0); |
7e9db9ea CH |
302 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); |
303 | } | |
1da177e4 LT |
304 | return ret; |
305 | } | |
306 | ||
c820de39 | 307 | int css_probe_device(struct subchannel_id schid) |
1da177e4 LT |
308 | { |
309 | int ret; | |
310 | struct subchannel *sch; | |
311 | ||
14556b33 SO |
312 | sch = css_alloc_subchannel(schid); |
313 | if (IS_ERR(sch)) | |
314 | return PTR_ERR(sch); | |
315 | ||
1da177e4 | 316 | ret = css_register_subchannel(sch); |
863fc849 SO |
317 | if (ret) |
318 | put_device(&sch->dev); | |
319 | ||
1da177e4 LT |
320 | return ret; |
321 | } | |
322 | ||
b0744bd2 CH |
323 | static int |
324 | check_subchannel(struct device * dev, void * data) | |
325 | { | |
326 | struct subchannel *sch; | |
a8237fc4 | 327 | struct subchannel_id *schid = data; |
b0744bd2 CH |
328 | |
329 | sch = to_subchannel(dev); | |
a8237fc4 | 330 | return schid_equal(&sch->schid, schid); |
b0744bd2 CH |
331 | } |
332 | ||
1da177e4 | 333 | struct subchannel * |
a8237fc4 | 334 | get_subchannel_by_schid(struct subchannel_id schid) |
1da177e4 | 335 | { |
1da177e4 LT |
336 | struct device *dev; |
337 | ||
b0744bd2 | 338 | dev = bus_find_device(&css_bus_type, NULL, |
12975aef | 339 | &schid, check_subchannel); |
1da177e4 | 340 | |
b0744bd2 | 341 | return dev ? to_subchannel(dev) : NULL; |
1da177e4 LT |
342 | } |
343 | ||
b279a4f5 CH |
344 | /** |
345 | * css_sch_is_valid() - check if a subchannel is valid | |
346 | * @schib: subchannel information block for the subchannel | |
347 | */ | |
348 | int css_sch_is_valid(struct schib *schib) | |
349 | { | |
350 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) | |
351 | return 0; | |
b3a686f4 CH |
352 | if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) |
353 | return 0; | |
b279a4f5 CH |
354 | return 1; |
355 | } | |
356 | EXPORT_SYMBOL_GPL(css_sch_is_valid); | |
357 | ||
564337f3 PO |
358 | static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) |
359 | { | |
360 | struct schib schib; | |
361 | ||
362 | if (!slow) { | |
363 | /* Will be done on the slow path. */ | |
364 | return -EAGAIN; | |
365 | } | |
cec85466 SO |
366 | if (stsch_err(schid, &schib)) { |
367 | /* Subchannel is not provided. */ | |
368 | return -ENXIO; | |
369 | } | |
370 | if (!css_sch_is_valid(&schib)) { | |
564337f3 PO |
371 | /* Unusable - ignore. */ |
372 | return 0; | |
1da177e4 | 373 | } |
5d6e6b6f PO |
374 | CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new\n", schid.ssid, |
375 | schid.sch_no); | |
564337f3 PO |
376 | |
377 | return css_probe_device(schid); | |
378 | } | |
379 | ||
c820de39 CH |
380 | static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) |
381 | { | |
382 | int ret = 0; | |
383 | ||
384 | if (sch->driver) { | |
385 | if (sch->driver->sch_event) | |
386 | ret = sch->driver->sch_event(sch, slow); | |
387 | else | |
388 | dev_dbg(&sch->dev, | |
389 | "Got subchannel machine check but " | |
390 | "no sch_event handler provided.\n"); | |
391 | } | |
5d6e6b6f PO |
392 | if (ret != 0 && ret != -EAGAIN) { |
393 | CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n", | |
394 | sch->schid.ssid, sch->schid.sch_no, ret); | |
395 | } | |
c820de39 CH |
396 | return ret; |
397 | } | |
398 | ||
83b3370c | 399 | static void css_evaluate_subchannel(struct subchannel_id schid, int slow) |
564337f3 PO |
400 | { |
401 | struct subchannel *sch; | |
402 | int ret; | |
403 | ||
404 | sch = get_subchannel_by_schid(schid); | |
405 | if (sch) { | |
406 | ret = css_evaluate_known_subchannel(sch, slow); | |
407 | put_device(&sch->dev); | |
408 | } else | |
409 | ret = css_evaluate_new_subchannel(schid, slow); | |
83b3370c PO |
410 | if (ret == -EAGAIN) |
411 | css_schedule_eval(schid); | |
1da177e4 LT |
412 | } |
413 | ||
817e5000 SO |
414 | /** |
415 | * css_sched_sch_todo - schedule a subchannel operation | |
416 | * @sch: subchannel | |
417 | * @todo: todo | |
418 | * | |
419 | * Schedule the operation identified by @todo to be performed on the slow path | |
420 | * workqueue. Do nothing if another operation with higher priority is already | |
421 | * scheduled. Needs to be called with subchannel lock held. | |
422 | */ | |
423 | void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo) | |
424 | { | |
425 | CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d\n", | |
426 | sch->schid.ssid, sch->schid.sch_no, todo); | |
427 | if (sch->todo >= todo) | |
428 | return; | |
429 | /* Get workqueue ref. */ | |
430 | if (!get_device(&sch->dev)) | |
431 | return; | |
432 | sch->todo = todo; | |
433 | if (!queue_work(cio_work_q, &sch->todo_work)) { | |
434 | /* Already queued, release workqueue ref. */ | |
435 | put_device(&sch->dev); | |
436 | } | |
437 | } | |
01c5e6dc | 438 | EXPORT_SYMBOL_GPL(css_sched_sch_todo); |
817e5000 SO |
439 | |
440 | static void css_sch_todo(struct work_struct *work) | |
441 | { | |
442 | struct subchannel *sch; | |
443 | enum sch_todo todo; | |
444 | int ret; | |
445 | ||
446 | sch = container_of(work, struct subchannel, todo_work); | |
447 | /* Find out todo. */ | |
448 | spin_lock_irq(sch->lock); | |
449 | todo = sch->todo; | |
450 | CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid, | |
451 | sch->schid.sch_no, todo); | |
452 | sch->todo = SCH_TODO_NOTHING; | |
453 | spin_unlock_irq(sch->lock); | |
454 | /* Perform todo. */ | |
455 | switch (todo) { | |
456 | case SCH_TODO_NOTHING: | |
457 | break; | |
458 | case SCH_TODO_EVAL: | |
459 | ret = css_evaluate_known_subchannel(sch, 1); | |
460 | if (ret == -EAGAIN) { | |
461 | spin_lock_irq(sch->lock); | |
462 | css_sched_sch_todo(sch, todo); | |
463 | spin_unlock_irq(sch->lock); | |
464 | } | |
465 | break; | |
466 | case SCH_TODO_UNREG: | |
467 | css_sch_device_unregister(sch); | |
468 | break; | |
469 | } | |
470 | /* Release workqueue ref. */ | |
471 | put_device(&sch->dev); | |
472 | } | |
473 | ||
83b3370c PO |
474 | static struct idset *slow_subchannel_set; |
475 | static spinlock_t slow_subchannel_lock; | |
25530553 SO |
476 | static wait_queue_head_t css_eval_wq; |
477 | static atomic_t css_eval_scheduled; | |
83b3370c PO |
478 | |
479 | static int __init slow_subchannel_init(void) | |
1da177e4 | 480 | { |
83b3370c | 481 | spin_lock_init(&slow_subchannel_lock); |
25530553 SO |
482 | atomic_set(&css_eval_scheduled, 0); |
483 | init_waitqueue_head(&css_eval_wq); | |
83b3370c PO |
484 | slow_subchannel_set = idset_sch_new(); |
485 | if (!slow_subchannel_set) { | |
e556bbbd | 486 | CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); |
83b3370c PO |
487 | return -ENOMEM; |
488 | } | |
489 | return 0; | |
1da177e4 LT |
490 | } |
491 | ||
e82a1567 | 492 | static int slow_eval_known_fn(struct subchannel *sch, void *data) |
1da177e4 | 493 | { |
e82a1567 PO |
494 | int eval; |
495 | int rc; | |
1da177e4 LT |
496 | |
497 | spin_lock_irq(&slow_subchannel_lock); | |
e82a1567 PO |
498 | eval = idset_sch_contains(slow_subchannel_set, sch->schid); |
499 | idset_sch_del(slow_subchannel_set, sch->schid); | |
500 | spin_unlock_irq(&slow_subchannel_lock); | |
501 | if (eval) { | |
502 | rc = css_evaluate_known_subchannel(sch, 1); | |
503 | if (rc == -EAGAIN) | |
504 | css_schedule_eval(sch->schid); | |
1da177e4 | 505 | } |
e82a1567 PO |
506 | return 0; |
507 | } | |
508 | ||
509 | static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) | |
510 | { | |
511 | int eval; | |
512 | int rc = 0; | |
513 | ||
514 | spin_lock_irq(&slow_subchannel_lock); | |
515 | eval = idset_sch_contains(slow_subchannel_set, schid); | |
516 | idset_sch_del(slow_subchannel_set, schid); | |
1da177e4 | 517 | spin_unlock_irq(&slow_subchannel_lock); |
e82a1567 PO |
518 | if (eval) { |
519 | rc = css_evaluate_new_subchannel(schid, 1); | |
520 | switch (rc) { | |
521 | case -EAGAIN: | |
522 | css_schedule_eval(schid); | |
523 | rc = 0; | |
524 | break; | |
525 | case -ENXIO: | |
526 | case -ENOMEM: | |
527 | case -EIO: | |
528 | /* These should abort looping */ | |
cec85466 | 529 | idset_sch_del_subseq(slow_subchannel_set, schid); |
e82a1567 PO |
530 | break; |
531 | default: | |
532 | rc = 0; | |
533 | } | |
534 | } | |
535 | return rc; | |
536 | } | |
537 | ||
538 | static void css_slow_path_func(struct work_struct *unused) | |
539 | { | |
25530553 SO |
540 | unsigned long flags; |
541 | ||
e82a1567 PO |
542 | CIO_TRACE_EVENT(4, "slowpath"); |
543 | for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, | |
544 | NULL); | |
25530553 SO |
545 | spin_lock_irqsave(&slow_subchannel_lock, flags); |
546 | if (idset_is_empty(slow_subchannel_set)) { | |
547 | atomic_set(&css_eval_scheduled, 0); | |
548 | wake_up(&css_eval_wq); | |
549 | } | |
550 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); | |
1da177e4 LT |
551 | } |
552 | ||
83b3370c | 553 | static DECLARE_WORK(slow_path_work, css_slow_path_func); |
be5d3823 | 554 | struct workqueue_struct *cio_work_q; |
1da177e4 | 555 | |
83b3370c PO |
556 | void css_schedule_eval(struct subchannel_id schid) |
557 | { | |
558 | unsigned long flags; | |
559 | ||
560 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
561 | idset_sch_add(slow_subchannel_set, schid); | |
25530553 | 562 | atomic_set(&css_eval_scheduled, 1); |
be5d3823 | 563 | queue_work(cio_work_q, &slow_path_work); |
83b3370c PO |
564 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
565 | } | |
566 | ||
567 | void css_schedule_eval_all(void) | |
568 | { | |
569 | unsigned long flags; | |
570 | ||
571 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
572 | idset_fill(slow_subchannel_set); | |
25530553 | 573 | atomic_set(&css_eval_scheduled, 1); |
be5d3823 | 574 | queue_work(cio_work_q, &slow_path_work); |
83b3370c PO |
575 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
576 | } | |
577 | ||
703e5c99 | 578 | static int __unset_registered(struct device *dev, void *data) |
22806dc1 | 579 | { |
703e5c99 SO |
580 | struct idset *set = data; |
581 | struct subchannel *sch = to_subchannel(dev); | |
40154b82 | 582 | |
703e5c99 SO |
583 | idset_sch_del(set, sch->schid); |
584 | return 0; | |
56e25e97 PO |
585 | } |
586 | ||
a8481c2a | 587 | static void css_schedule_eval_all_unreg(void) |
40154b82 | 588 | { |
703e5c99 SO |
589 | unsigned long flags; |
590 | struct idset *unreg_set; | |
40154b82 | 591 | |
703e5c99 SO |
592 | /* Find unregistered subchannels. */ |
593 | unreg_set = idset_sch_new(); | |
594 | if (!unreg_set) { | |
595 | /* Fallback. */ | |
596 | css_schedule_eval_all(); | |
56e25e97 PO |
597 | return; |
598 | } | |
703e5c99 SO |
599 | idset_fill(unreg_set); |
600 | bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered); | |
601 | /* Apply to slow_subchannel_set. */ | |
602 | spin_lock_irqsave(&slow_subchannel_lock, flags); | |
603 | idset_add_set(slow_subchannel_set, unreg_set); | |
604 | atomic_set(&css_eval_scheduled, 1); | |
be5d3823 | 605 | queue_work(cio_work_q, &slow_path_work); |
703e5c99 SO |
606 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
607 | idset_free(unreg_set); | |
40154b82 PO |
608 | } |
609 | ||
703e5c99 SO |
610 | void css_wait_for_slow_path(void) |
611 | { | |
be5d3823 | 612 | flush_workqueue(cio_work_q); |
703e5c99 | 613 | } |
40154b82 PO |
614 | |
615 | /* Schedule reprobing of all unregistered subchannels. */ | |
616 | void css_schedule_reprobe(void) | |
617 | { | |
703e5c99 | 618 | css_schedule_eval_all_unreg(); |
40154b82 | 619 | } |
40154b82 PO |
620 | EXPORT_SYMBOL_GPL(css_schedule_reprobe); |
621 | ||
1da177e4 LT |
622 | /* |
623 | * Called from the machine check handler for subchannel report words. | |
624 | */ | |
c1156189 | 625 | static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) |
1da177e4 | 626 | { |
a8237fc4 | 627 | struct subchannel_id mchk_schid; |
4bc4e965 | 628 | struct subchannel *sch; |
1da177e4 | 629 | |
c1156189 CH |
630 | if (overflow) { |
631 | css_schedule_eval_all(); | |
632 | return; | |
633 | } | |
634 | CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " | |
635 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
636 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
637 | crw0->erc, crw0->rsid); | |
638 | if (crw1) | |
639 | CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " | |
640 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
641 | crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, | |
642 | crw1->anc, crw1->erc, crw1->rsid); | |
a8237fc4 | 643 | init_subchannel_id(&mchk_schid); |
c1156189 CH |
644 | mchk_schid.sch_no = crw0->rsid; |
645 | if (crw1) | |
8d7bfb4a | 646 | mchk_schid.ssid = (crw1->rsid >> 4) & 3; |
fb6958a5 | 647 | |
4bc4e965 SO |
648 | if (crw0->erc == CRW_ERC_PMOD) { |
649 | sch = get_subchannel_by_schid(mchk_schid); | |
650 | if (sch) { | |
651 | css_update_ssd_info(sch); | |
652 | put_device(&sch->dev); | |
653 | } | |
654 | } | |
c1156189 | 655 | /* |
1da177e4 LT |
656 | * Since we are always presented with IPI in the CRW, we have to |
657 | * use stsch() to find out if the subchannel in question has come | |
658 | * or gone. | |
659 | */ | |
83b3370c | 660 | css_evaluate_subchannel(mchk_schid, 0); |
1da177e4 LT |
661 | } |
662 | ||
663 | static void __init | |
a28c6944 | 664 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
1da177e4 | 665 | { |
94038a99 MS |
666 | struct cpuid cpu_id; |
667 | ||
75784c00 | 668 | if (css_general_characteristics.mcss) { |
a28c6944 CH |
669 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
670 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; | |
671 | } else { | |
1da177e4 | 672 | #ifdef CONFIG_SMP |
7b468488 | 673 | css->global_pgid.pgid_high.cpu_addr = stap(); |
1da177e4 | 674 | #else |
a28c6944 | 675 | css->global_pgid.pgid_high.cpu_addr = 0; |
1da177e4 LT |
676 | #endif |
677 | } | |
94038a99 MS |
678 | get_cpu_id(&cpu_id); |
679 | css->global_pgid.cpu_id = cpu_id.ident; | |
680 | css->global_pgid.cpu_model = cpu_id.machine; | |
a28c6944 CH |
681 | css->global_pgid.tod_high = tod_high; |
682 | ||
683 | } | |
684 | ||
3b793060 CH |
685 | static void |
686 | channel_subsystem_release(struct device *dev) | |
687 | { | |
688 | struct channel_subsystem *css; | |
689 | ||
690 | css = to_css(dev); | |
495a5b45 | 691 | mutex_destroy(&css->mutex); |
a2164b81 CH |
692 | if (css->pseudo_subchannel) { |
693 | /* Implies that it has been generated but never registered. */ | |
694 | css_subchannel_release(&css->pseudo_subchannel->dev); | |
695 | css->pseudo_subchannel = NULL; | |
696 | } | |
3b793060 CH |
697 | kfree(css); |
698 | } | |
699 | ||
495a5b45 CH |
700 | static ssize_t |
701 | css_cm_enable_show(struct device *dev, struct device_attribute *attr, | |
702 | char *buf) | |
703 | { | |
704 | struct channel_subsystem *css = to_css(dev); | |
8284fb19 | 705 | int ret; |
495a5b45 CH |
706 | |
707 | if (!css) | |
708 | return 0; | |
8284fb19 ME |
709 | mutex_lock(&css->mutex); |
710 | ret = sprintf(buf, "%x\n", css->cm_enabled); | |
711 | mutex_unlock(&css->mutex); | |
712 | return ret; | |
495a5b45 CH |
713 | } |
714 | ||
715 | static ssize_t | |
716 | css_cm_enable_store(struct device *dev, struct device_attribute *attr, | |
717 | const char *buf, size_t count) | |
718 | { | |
719 | struct channel_subsystem *css = to_css(dev); | |
720 | int ret; | |
2f972202 | 721 | unsigned long val; |
495a5b45 | 722 | |
2f972202 CH |
723 | ret = strict_strtoul(buf, 16, &val); |
724 | if (ret) | |
725 | return ret; | |
8284fb19 | 726 | mutex_lock(&css->mutex); |
2f972202 CH |
727 | switch (val) { |
728 | case 0: | |
495a5b45 CH |
729 | ret = css->cm_enabled ? chsc_secm(css, 0) : 0; |
730 | break; | |
2f972202 | 731 | case 1: |
495a5b45 CH |
732 | ret = css->cm_enabled ? 0 : chsc_secm(css, 1); |
733 | break; | |
734 | default: | |
735 | ret = -EINVAL; | |
736 | } | |
8284fb19 | 737 | mutex_unlock(&css->mutex); |
495a5b45 CH |
738 | return ret < 0 ? ret : count; |
739 | } | |
740 | ||
741 | static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); | |
742 | ||
4d284cac | 743 | static int __init setup_css(int nr) |
a28c6944 CH |
744 | { |
745 | u32 tod_high; | |
d7b5a4c9 | 746 | int ret; |
7c9f4e3a | 747 | struct channel_subsystem *css; |
a28c6944 | 748 | |
7c9f4e3a CH |
749 | css = channel_subsystems[nr]; |
750 | memset(css, 0, sizeof(struct channel_subsystem)); | |
751 | css->pseudo_subchannel = | |
752 | kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL); | |
753 | if (!css->pseudo_subchannel) | |
d7b5a4c9 | 754 | return -ENOMEM; |
7c9f4e3a CH |
755 | css->pseudo_subchannel->dev.parent = &css->device; |
756 | css->pseudo_subchannel->dev.release = css_subchannel_release; | |
1bf5b285 | 757 | dev_set_name(&css->pseudo_subchannel->dev, "defunct"); |
5d6e6b6f | 758 | mutex_init(&css->pseudo_subchannel->reg_mutex); |
7c9f4e3a | 759 | ret = cio_create_sch_lock(css->pseudo_subchannel); |
d7b5a4c9 | 760 | if (ret) { |
7c9f4e3a | 761 | kfree(css->pseudo_subchannel); |
d7b5a4c9 CH |
762 | return ret; |
763 | } | |
7c9f4e3a CH |
764 | mutex_init(&css->mutex); |
765 | css->valid = 1; | |
766 | css->cssid = nr; | |
1bf5b285 | 767 | dev_set_name(&css->device, "css%x", nr); |
7c9f4e3a | 768 | css->device.release = channel_subsystem_release; |
1aae0560 | 769 | tod_high = (u32) (get_tod_clock() >> 32); |
7c9f4e3a | 770 | css_generate_pgid(css, tod_high); |
d7b5a4c9 | 771 | return 0; |
1da177e4 LT |
772 | } |
773 | ||
a55360df CH |
774 | static int css_reboot_event(struct notifier_block *this, |
775 | unsigned long event, | |
776 | void *ptr) | |
777 | { | |
778 | int ret, i; | |
779 | ||
780 | ret = NOTIFY_DONE; | |
781 | for (i = 0; i <= __MAX_CSSID; i++) { | |
782 | struct channel_subsystem *css; | |
783 | ||
784 | css = channel_subsystems[i]; | |
8284fb19 | 785 | mutex_lock(&css->mutex); |
a55360df CH |
786 | if (css->cm_enabled) |
787 | if (chsc_secm(css, 0)) | |
788 | ret = NOTIFY_BAD; | |
8284fb19 | 789 | mutex_unlock(&css->mutex); |
a55360df CH |
790 | } |
791 | ||
792 | return ret; | |
793 | } | |
794 | ||
795 | static struct notifier_block css_reboot_notifier = { | |
796 | .notifier_call = css_reboot_event, | |
797 | }; | |
798 | ||
dcbd16d5 SO |
799 | /* |
800 | * Since the css devices are neither on a bus nor have a class | |
801 | * nor have a special device type, we cannot stop/restart channel | |
802 | * path measurements via the normal suspend/resume callbacks, but have | |
803 | * to use notifiers. | |
804 | */ | |
805 | static int css_power_event(struct notifier_block *this, unsigned long event, | |
806 | void *ptr) | |
807 | { | |
dcbd16d5 SO |
808 | int ret, i; |
809 | ||
810 | switch (event) { | |
811 | case PM_HIBERNATION_PREPARE: | |
812 | case PM_SUSPEND_PREPARE: | |
813 | ret = NOTIFY_DONE; | |
814 | for (i = 0; i <= __MAX_CSSID; i++) { | |
815 | struct channel_subsystem *css; | |
816 | ||
817 | css = channel_subsystems[i]; | |
818 | mutex_lock(&css->mutex); | |
819 | if (!css->cm_enabled) { | |
820 | mutex_unlock(&css->mutex); | |
821 | continue; | |
822 | } | |
f0c077a8 AM |
823 | ret = __chsc_do_secm(css, 0); |
824 | ret = notifier_from_errno(ret); | |
dcbd16d5 SO |
825 | mutex_unlock(&css->mutex); |
826 | } | |
827 | break; | |
828 | case PM_POST_HIBERNATION: | |
829 | case PM_POST_SUSPEND: | |
830 | ret = NOTIFY_DONE; | |
831 | for (i = 0; i <= __MAX_CSSID; i++) { | |
832 | struct channel_subsystem *css; | |
833 | ||
834 | css = channel_subsystems[i]; | |
835 | mutex_lock(&css->mutex); | |
836 | if (!css->cm_enabled) { | |
837 | mutex_unlock(&css->mutex); | |
838 | continue; | |
839 | } | |
f0c077a8 AM |
840 | ret = __chsc_do_secm(css, 1); |
841 | ret = notifier_from_errno(ret); | |
dcbd16d5 SO |
842 | mutex_unlock(&css->mutex); |
843 | } | |
844 | /* search for subchannels, which appeared during hibernation */ | |
845 | css_schedule_reprobe(); | |
846 | break; | |
847 | default: | |
848 | ret = NOTIFY_DONE; | |
849 | } | |
850 | return ret; | |
851 | ||
852 | } | |
853 | static struct notifier_block css_power_notifier = { | |
854 | .notifier_call = css_power_event, | |
855 | }; | |
856 | ||
1da177e4 LT |
857 | /* |
858 | * Now that the driver core is running, we can setup our channel subsystem. | |
14556b33 | 859 | * The struct subchannel's are created during probing. |
1da177e4 | 860 | */ |
2f17644d | 861 | static int __init css_bus_init(void) |
1da177e4 | 862 | { |
a28c6944 | 863 | int ret, i; |
1da177e4 | 864 | |
34aec07c SO |
865 | ret = chsc_init(); |
866 | if (ret) | |
867 | return ret; | |
868 | ||
34196f82 | 869 | chsc_determine_css_characteristics(); |
b0a285d3 SO |
870 | /* Try to enable MSS. */ |
871 | ret = chsc_enable_facility(CHSC_SDA_OC_MSS); | |
818c272b | 872 | if (ret) |
b0a285d3 | 873 | max_ssid = 0; |
818c272b SO |
874 | else /* Success. */ |
875 | max_ssid = __MAX_SSID; | |
b0a285d3 | 876 | |
4434a38c CH |
877 | ret = slow_subchannel_init(); |
878 | if (ret) | |
879 | goto out; | |
880 | ||
f5daba1d | 881 | ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); |
c1156189 CH |
882 | if (ret) |
883 | goto out; | |
884 | ||
1da177e4 LT |
885 | if ((ret = bus_register(&css_bus_type))) |
886 | goto out; | |
1da177e4 | 887 | |
a28c6944 CH |
888 | /* Setup css structure. */ |
889 | for (i = 0; i <= __MAX_CSSID; i++) { | |
7c9f4e3a CH |
890 | struct channel_subsystem *css; |
891 | ||
892 | css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); | |
893 | if (!css) { | |
a28c6944 | 894 | ret = -ENOMEM; |
fb6958a5 | 895 | goto out_unregister; |
a28c6944 | 896 | } |
7c9f4e3a | 897 | channel_subsystems[i] = css; |
d7b5a4c9 | 898 | ret = setup_css(i); |
a2164b81 CH |
899 | if (ret) { |
900 | kfree(channel_subsystems[i]); | |
901 | goto out_unregister; | |
902 | } | |
7c9f4e3a | 903 | ret = device_register(&css->device); |
a2164b81 CH |
904 | if (ret) { |
905 | put_device(&css->device); | |
906 | goto out_unregister; | |
907 | } | |
75784c00 | 908 | if (css_chsc_characteristics.secm) { |
7c9f4e3a | 909 | ret = device_create_file(&css->device, |
7e560814 CH |
910 | &dev_attr_cm_enable); |
911 | if (ret) | |
912 | goto out_device; | |
913 | } | |
7c9f4e3a | 914 | ret = device_register(&css->pseudo_subchannel->dev); |
c6304933 SO |
915 | if (ret) { |
916 | put_device(&css->pseudo_subchannel->dev); | |
d7b5a4c9 | 917 | goto out_file; |
c6304933 | 918 | } |
a28c6944 | 919 | } |
a55360df CH |
920 | ret = register_reboot_notifier(&css_reboot_notifier); |
921 | if (ret) | |
a2164b81 | 922 | goto out_unregister; |
dcbd16d5 SO |
923 | ret = register_pm_notifier(&css_power_notifier); |
924 | if (ret) { | |
925 | unregister_reboot_notifier(&css_reboot_notifier); | |
926 | goto out_unregister; | |
927 | } | |
1da177e4 LT |
928 | css_init_done = 1; |
929 | ||
3a3fc29a | 930 | /* Enable default isc for I/O subchannels. */ |
6ef556cc | 931 | isc_register(IO_SCH_ISC); |
1da177e4 | 932 | |
1da177e4 | 933 | return 0; |
d7b5a4c9 | 934 | out_file: |
a2164b81 CH |
935 | if (css_chsc_characteristics.secm) |
936 | device_remove_file(&channel_subsystems[i]->device, | |
937 | &dev_attr_cm_enable); | |
7e560814 | 938 | out_device: |
7c9f4e3a | 939 | device_unregister(&channel_subsystems[i]->device); |
fb6958a5 | 940 | out_unregister: |
a28c6944 | 941 | while (i > 0) { |
7c9f4e3a CH |
942 | struct channel_subsystem *css; |
943 | ||
a28c6944 | 944 | i--; |
7c9f4e3a CH |
945 | css = channel_subsystems[i]; |
946 | device_unregister(&css->pseudo_subchannel->dev); | |
a2164b81 | 947 | css->pseudo_subchannel = NULL; |
75784c00 | 948 | if (css_chsc_characteristics.secm) |
7c9f4e3a | 949 | device_remove_file(&css->device, |
495a5b45 | 950 | &dev_attr_cm_enable); |
7c9f4e3a | 951 | device_unregister(&css->device); |
a28c6944 | 952 | } |
1da177e4 LT |
953 | bus_unregister(&css_bus_type); |
954 | out: | |
34aec07c | 955 | crw_unregister_handler(CRW_RSC_SCH); |
b827d1c8 | 956 | idset_free(slow_subchannel_set); |
34aec07c | 957 | chsc_init_cleanup(); |
e6d5a428 ME |
958 | pr_alert("The CSS device driver initialization failed with " |
959 | "errno=%d\n", ret); | |
1da177e4 LT |
960 | return ret; |
961 | } | |
962 | ||
2f17644d SO |
963 | static void __init css_bus_cleanup(void) |
964 | { | |
965 | struct channel_subsystem *css; | |
966 | int i; | |
967 | ||
968 | for (i = 0; i <= __MAX_CSSID; i++) { | |
969 | css = channel_subsystems[i]; | |
970 | device_unregister(&css->pseudo_subchannel->dev); | |
971 | css->pseudo_subchannel = NULL; | |
972 | if (css_chsc_characteristics.secm) | |
973 | device_remove_file(&css->device, &dev_attr_cm_enable); | |
974 | device_unregister(&css->device); | |
975 | } | |
976 | bus_unregister(&css_bus_type); | |
34aec07c | 977 | crw_unregister_handler(CRW_RSC_SCH); |
b827d1c8 | 978 | idset_free(slow_subchannel_set); |
34aec07c | 979 | chsc_init_cleanup(); |
2f17644d SO |
980 | isc_unregister(IO_SCH_ISC); |
981 | } | |
982 | ||
983 | static int __init channel_subsystem_init(void) | |
984 | { | |
985 | int ret; | |
986 | ||
987 | ret = css_bus_init(); | |
988 | if (ret) | |
989 | return ret; | |
be5d3823 SO |
990 | cio_work_q = create_singlethread_workqueue("cio"); |
991 | if (!cio_work_q) { | |
992 | ret = -ENOMEM; | |
993 | goto out_bus; | |
994 | } | |
2f17644d SO |
995 | ret = io_subchannel_init(); |
996 | if (ret) | |
be5d3823 | 997 | goto out_wq; |
2f17644d SO |
998 | |
999 | return ret; | |
be5d3823 SO |
1000 | out_wq: |
1001 | destroy_workqueue(cio_work_q); | |
1002 | out_bus: | |
1003 | css_bus_cleanup(); | |
1004 | return ret; | |
2f17644d SO |
1005 | } |
1006 | subsys_initcall(channel_subsystem_init); | |
1007 | ||
8ea7f559 SO |
1008 | static int css_settle(struct device_driver *drv, void *unused) |
1009 | { | |
1010 | struct css_driver *cssdrv = to_cssdriver(drv); | |
1011 | ||
1012 | if (cssdrv->settle) | |
b4c70721 | 1013 | return cssdrv->settle(); |
8ea7f559 SO |
1014 | return 0; |
1015 | } | |
1016 | ||
0d01bb89 | 1017 | int css_complete_work(void) |
879acca5 SO |
1018 | { |
1019 | int ret; | |
1020 | ||
1021 | /* Wait for the evaluation of subchannels to finish. */ | |
b4c70721 SO |
1022 | ret = wait_event_interruptible(css_eval_wq, |
1023 | atomic_read(&css_eval_scheduled) == 0); | |
1024 | if (ret) | |
1025 | return -EINTR; | |
879acca5 SO |
1026 | flush_workqueue(cio_work_q); |
1027 | /* Wait for the subchannel type specific initialization to finish */ | |
b4c70721 | 1028 | return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle); |
879acca5 SO |
1029 | } |
1030 | ||
1031 | ||
2f17644d SO |
1032 | /* |
1033 | * Wait for the initialization of devices to finish, to make sure we are | |
1034 | * done with our setup if the search for the root device starts. | |
1035 | */ | |
1036 | static int __init channel_subsystem_init_sync(void) | |
1037 | { | |
14556b33 SO |
1038 | /* Register subchannels which are already in use. */ |
1039 | cio_register_early_subchannels(); | |
703e5c99 SO |
1040 | /* Start initial subchannel evaluation. */ |
1041 | css_schedule_eval_all(); | |
879acca5 SO |
1042 | css_complete_work(); |
1043 | return 0; | |
2f17644d SO |
1044 | } |
1045 | subsys_initcall_sync(channel_subsystem_init_sync); | |
1046 | ||
889ee955 SO |
1047 | void channel_subsystem_reinit(void) |
1048 | { | |
62da177a SO |
1049 | struct channel_path *chp; |
1050 | struct chp_id chpid; | |
1051 | ||
889ee955 | 1052 | chsc_enable_facility(CHSC_SDA_OC_MSS); |
62da177a SO |
1053 | chp_id_for_each(&chpid) { |
1054 | chp = chpid_to_chp(chpid); | |
cce0eacc PO |
1055 | if (chp) |
1056 | chp_update_desc(chp); | |
62da177a | 1057 | } |
889ee955 SO |
1058 | } |
1059 | ||
879acca5 SO |
1060 | #ifdef CONFIG_PROC_FS |
1061 | static ssize_t cio_settle_write(struct file *file, const char __user *buf, | |
1062 | size_t count, loff_t *ppos) | |
1063 | { | |
b4c70721 SO |
1064 | int ret; |
1065 | ||
879acca5 SO |
1066 | /* Handle pending CRW's. */ |
1067 | crw_wait_for_channel_report(); | |
b4c70721 SO |
1068 | ret = css_complete_work(); |
1069 | ||
1070 | return ret ? ret : count; | |
879acca5 SO |
1071 | } |
1072 | ||
1073 | static const struct file_operations cio_settle_proc_fops = { | |
58ea91c0 | 1074 | .open = nonseekable_open, |
879acca5 | 1075 | .write = cio_settle_write, |
6038f373 | 1076 | .llseek = no_llseek, |
879acca5 SO |
1077 | }; |
1078 | ||
1079 | static int __init cio_settle_init(void) | |
1080 | { | |
1081 | struct proc_dir_entry *entry; | |
1082 | ||
1083 | entry = proc_create("cio_settle", S_IWUSR, NULL, | |
1084 | &cio_settle_proc_fops); | |
1085 | if (!entry) | |
1086 | return -ENOMEM; | |
1087 | return 0; | |
1088 | } | |
1089 | device_initcall(cio_settle_init); | |
1090 | #endif /*CONFIG_PROC_FS*/ | |
1091 | ||
d7b5a4c9 CH |
1092 | int sch_is_pseudo_sch(struct subchannel *sch) |
1093 | { | |
1094 | return sch == to_css(sch->dev.parent)->pseudo_subchannel; | |
1095 | } | |
1096 | ||
f08adc00 | 1097 | static int css_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1098 | { |
084325d8 CH |
1099 | struct subchannel *sch = to_subchannel(dev); |
1100 | struct css_driver *driver = to_cssdriver(drv); | |
f08adc00 | 1101 | struct css_device_id *id; |
1da177e4 | 1102 | |
f08adc00 CH |
1103 | for (id = driver->subchannel_type; id->match_flags; id++) { |
1104 | if (sch->st == id->type) | |
1105 | return 1; | |
1106 | } | |
1da177e4 LT |
1107 | |
1108 | return 0; | |
1109 | } | |
1110 | ||
98c13c28 | 1111 | static int css_probe(struct device *dev) |
8bbace7e CH |
1112 | { |
1113 | struct subchannel *sch; | |
98c13c28 | 1114 | int ret; |
8bbace7e CH |
1115 | |
1116 | sch = to_subchannel(dev); | |
084325d8 | 1117 | sch->driver = to_cssdriver(dev->driver); |
98c13c28 CH |
1118 | ret = sch->driver->probe ? sch->driver->probe(sch) : 0; |
1119 | if (ret) | |
1120 | sch->driver = NULL; | |
1121 | return ret; | |
8bbace7e CH |
1122 | } |
1123 | ||
98c13c28 | 1124 | static int css_remove(struct device *dev) |
8bbace7e CH |
1125 | { |
1126 | struct subchannel *sch; | |
98c13c28 | 1127 | int ret; |
8bbace7e CH |
1128 | |
1129 | sch = to_subchannel(dev); | |
98c13c28 CH |
1130 | ret = sch->driver->remove ? sch->driver->remove(sch) : 0; |
1131 | sch->driver = NULL; | |
1132 | return ret; | |
8bbace7e CH |
1133 | } |
1134 | ||
98c13c28 | 1135 | static void css_shutdown(struct device *dev) |
8bbace7e CH |
1136 | { |
1137 | struct subchannel *sch; | |
1138 | ||
1139 | sch = to_subchannel(dev); | |
98c13c28 | 1140 | if (sch->driver && sch->driver->shutdown) |
8bbace7e CH |
1141 | sch->driver->shutdown(sch); |
1142 | } | |
1143 | ||
7e9db9ea CH |
1144 | static int css_uevent(struct device *dev, struct kobj_uevent_env *env) |
1145 | { | |
1146 | struct subchannel *sch = to_subchannel(dev); | |
1147 | int ret; | |
1148 | ||
1149 | ret = add_uevent_var(env, "ST=%01X", sch->st); | |
1150 | if (ret) | |
1151 | return ret; | |
1152 | ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); | |
1153 | return ret; | |
1154 | } | |
1155 | ||
dcbd16d5 SO |
1156 | static int css_pm_prepare(struct device *dev) |
1157 | { | |
1158 | struct subchannel *sch = to_subchannel(dev); | |
1159 | struct css_driver *drv; | |
1160 | ||
1161 | if (mutex_is_locked(&sch->reg_mutex)) | |
1162 | return -EAGAIN; | |
1163 | if (!sch->dev.driver) | |
1164 | return 0; | |
1165 | drv = to_cssdriver(sch->dev.driver); | |
1166 | /* Notify drivers that they may not register children. */ | |
1167 | return drv->prepare ? drv->prepare(sch) : 0; | |
1168 | } | |
1169 | ||
1170 | static void css_pm_complete(struct device *dev) | |
1171 | { | |
1172 | struct subchannel *sch = to_subchannel(dev); | |
1173 | struct css_driver *drv; | |
1174 | ||
1175 | if (!sch->dev.driver) | |
1176 | return; | |
1177 | drv = to_cssdriver(sch->dev.driver); | |
1178 | if (drv->complete) | |
1179 | drv->complete(sch); | |
1180 | } | |
1181 | ||
1182 | static int css_pm_freeze(struct device *dev) | |
1183 | { | |
1184 | struct subchannel *sch = to_subchannel(dev); | |
1185 | struct css_driver *drv; | |
1186 | ||
1187 | if (!sch->dev.driver) | |
1188 | return 0; | |
1189 | drv = to_cssdriver(sch->dev.driver); | |
1190 | return drv->freeze ? drv->freeze(sch) : 0; | |
1191 | } | |
1192 | ||
1193 | static int css_pm_thaw(struct device *dev) | |
1194 | { | |
1195 | struct subchannel *sch = to_subchannel(dev); | |
1196 | struct css_driver *drv; | |
1197 | ||
1198 | if (!sch->dev.driver) | |
1199 | return 0; | |
1200 | drv = to_cssdriver(sch->dev.driver); | |
1201 | return drv->thaw ? drv->thaw(sch) : 0; | |
1202 | } | |
1203 | ||
1204 | static int css_pm_restore(struct device *dev) | |
1205 | { | |
1206 | struct subchannel *sch = to_subchannel(dev); | |
1207 | struct css_driver *drv; | |
1208 | ||
eb4f5d93 | 1209 | css_update_ssd_info(sch); |
dcbd16d5 SO |
1210 | if (!sch->dev.driver) |
1211 | return 0; | |
1212 | drv = to_cssdriver(sch->dev.driver); | |
1213 | return drv->restore ? drv->restore(sch) : 0; | |
1214 | } | |
1215 | ||
47145210 | 1216 | static const struct dev_pm_ops css_pm_ops = { |
dcbd16d5 SO |
1217 | .prepare = css_pm_prepare, |
1218 | .complete = css_pm_complete, | |
1219 | .freeze = css_pm_freeze, | |
1220 | .thaw = css_pm_thaw, | |
1221 | .restore = css_pm_restore, | |
1222 | }; | |
1223 | ||
3041b6ab | 1224 | static struct bus_type css_bus_type = { |
8bbace7e CH |
1225 | .name = "css", |
1226 | .match = css_bus_match, | |
1227 | .probe = css_probe, | |
1228 | .remove = css_remove, | |
1229 | .shutdown = css_shutdown, | |
7e9db9ea | 1230 | .uevent = css_uevent, |
dcbd16d5 | 1231 | .pm = &css_pm_ops, |
1da177e4 LT |
1232 | }; |
1233 | ||
25b7bb58 CH |
1234 | /** |
1235 | * css_driver_register - register a css driver | |
1236 | * @cdrv: css driver to register | |
1237 | * | |
1238 | * This is mainly a wrapper around driver_register that sets name | |
1239 | * and bus_type in the embedded struct device_driver correctly. | |
1240 | */ | |
1241 | int css_driver_register(struct css_driver *cdrv) | |
1242 | { | |
25b7bb58 CH |
1243 | cdrv->drv.bus = &css_bus_type; |
1244 | return driver_register(&cdrv->drv); | |
1245 | } | |
1246 | EXPORT_SYMBOL_GPL(css_driver_register); | |
1247 | ||
1248 | /** | |
1249 | * css_driver_unregister - unregister a css driver | |
1250 | * @cdrv: css driver to unregister | |
1251 | * | |
1252 | * This is a wrapper around driver_unregister. | |
1253 | */ | |
1254 | void css_driver_unregister(struct css_driver *cdrv) | |
1255 | { | |
1256 | driver_unregister(&cdrv->drv); | |
1257 | } | |
1258 | EXPORT_SYMBOL_GPL(css_driver_unregister); | |
1259 | ||
1da177e4 | 1260 | MODULE_LICENSE("GPL"); |