Commit | Line | Data |
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e6b6e10a PO |
1 | /* |
2 | * drivers/s390/cio/chp.c | |
3 | * | |
4 | * Copyright IBM Corp. 1999,2007 | |
5 | * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) | |
6 | * Arnd Bergmann (arndb@de.ibm.com) | |
7 | * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | |
8 | */ | |
9 | ||
10 | #include <linux/bug.h> | |
11 | #include <linux/workqueue.h> | |
12 | #include <linux/spinlock.h> | |
e5854a58 PO |
13 | #include <linux/init.h> |
14 | #include <linux/jiffies.h> | |
15 | #include <linux/wait.h> | |
16 | #include <linux/mutex.h> | |
e6b6e10a | 17 | #include <asm/errno.h> |
e5854a58 PO |
18 | #include <asm/chpid.h> |
19 | #include <asm/sclp.h> | |
e6b6e10a | 20 | |
e6b6e10a PO |
21 | #include "cio.h" |
22 | #include "css.h" | |
23 | #include "ioasm.h" | |
24 | #include "cio_debug.h" | |
25 | #include "chp.h" | |
26 | ||
27 | #define to_channelpath(device) container_of(device, struct channel_path, dev) | |
e5854a58 PO |
28 | #define CHP_INFO_UPDATE_INTERVAL 1*HZ |
29 | ||
30 | enum cfg_task_t { | |
31 | cfg_none, | |
32 | cfg_configure, | |
33 | cfg_deconfigure | |
34 | }; | |
35 | ||
36 | /* Map for pending configure tasks. */ | |
37 | static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1]; | |
38 | static DEFINE_MUTEX(cfg_lock); | |
39 | static int cfg_busy; | |
40 | ||
41 | /* Map for channel-path status. */ | |
42 | static struct sclp_chp_info chp_info; | |
43 | static DEFINE_MUTEX(info_lock); | |
44 | ||
45 | /* Time after which channel-path status may be outdated. */ | |
46 | static unsigned long chp_info_expires; | |
47 | ||
48 | /* Workqueue to perform pending configure tasks. */ | |
49 | static struct workqueue_struct *chp_wq; | |
50 | static struct work_struct cfg_work; | |
51 | ||
52 | /* Wait queue for configure completion events. */ | |
53 | static wait_queue_head_t cfg_wait_queue; | |
e6b6e10a PO |
54 | |
55 | /* Return channel_path struct for given chpid. */ | |
56 | static inline struct channel_path *chpid_to_chp(struct chp_id chpid) | |
57 | { | |
58 | return css[chpid.cssid]->chps[chpid.id]; | |
59 | } | |
60 | ||
61 | /* Set vary state for given chpid. */ | |
62 | static void set_chp_logically_online(struct chp_id chpid, int onoff) | |
63 | { | |
64 | chpid_to_chp(chpid)->state = onoff; | |
65 | } | |
66 | ||
67 | /* On succes return 0 if channel-path is varied offline, 1 if it is varied | |
68 | * online. Return -ENODEV if channel-path is not registered. */ | |
69 | int chp_get_status(struct chp_id chpid) | |
70 | { | |
71 | return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); | |
72 | } | |
73 | ||
74 | /** | |
75 | * chp_get_sch_opm - return opm for subchannel | |
76 | * @sch: subchannel | |
77 | * | |
78 | * Calculate and return the operational path mask (opm) based on the chpids | |
79 | * used by the subchannel and the status of the associated channel-paths. | |
80 | */ | |
81 | u8 chp_get_sch_opm(struct subchannel *sch) | |
82 | { | |
83 | struct chp_id chpid; | |
84 | int opm; | |
85 | int i; | |
86 | ||
87 | opm = 0; | |
88 | chp_id_init(&chpid); | |
89 | for (i=0; i < 8; i++) { | |
90 | opm <<= 1; | |
91 | chpid.id = sch->schib.pmcw.chpid[i]; | |
92 | if (chp_get_status(chpid) != 0) | |
93 | opm |= 1; | |
94 | } | |
95 | return opm; | |
96 | } | |
97 | ||
98 | /** | |
99 | * chp_is_registered - check if a channel-path is registered | |
100 | * @chpid: channel-path ID | |
101 | * | |
102 | * Return non-zero if a channel-path with the given chpid is registered, | |
103 | * zero otherwise. | |
104 | */ | |
105 | int chp_is_registered(struct chp_id chpid) | |
106 | { | |
107 | return chpid_to_chp(chpid) != NULL; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Function: s390_vary_chpid | |
112 | * Varies the specified chpid online or offline | |
113 | */ | |
114 | static int s390_vary_chpid(struct chp_id chpid, int on) | |
115 | { | |
116 | char dbf_text[15]; | |
117 | int status; | |
118 | ||
119 | sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, | |
120 | chpid.id); | |
121 | CIO_TRACE_EVENT( 2, dbf_text); | |
122 | ||
123 | status = chp_get_status(chpid); | |
124 | if (status < 0) { | |
125 | printk(KERN_ERR "Can't vary unknown chpid %x.%02x\n", | |
126 | chpid.cssid, chpid.id); | |
127 | return -EINVAL; | |
128 | } | |
129 | ||
130 | if (!on && !status) { | |
131 | printk(KERN_ERR "chpid %x.%02x is already offline\n", | |
132 | chpid.cssid, chpid.id); | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | set_chp_logically_online(chpid, on); | |
137 | chsc_chp_vary(chpid, on); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Channel measurement related functions | |
143 | */ | |
91a69029 ZR |
144 | static ssize_t chp_measurement_chars_read(struct kobject *kobj, |
145 | struct bin_attribute *bin_attr, | |
146 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
147 | { |
148 | struct channel_path *chp; | |
149 | unsigned int size; | |
150 | ||
151 | chp = to_channelpath(container_of(kobj, struct device, kobj)); | |
152 | if (!chp->cmg_chars) | |
153 | return 0; | |
154 | ||
155 | size = sizeof(struct cmg_chars); | |
156 | ||
157 | if (off > size) | |
158 | return 0; | |
159 | if (off + count > size) | |
160 | count = size - off; | |
161 | memcpy(buf, chp->cmg_chars + off, count); | |
162 | return count; | |
163 | } | |
164 | ||
165 | static struct bin_attribute chp_measurement_chars_attr = { | |
166 | .attr = { | |
167 | .name = "measurement_chars", | |
168 | .mode = S_IRUSR, | |
e6b6e10a PO |
169 | }, |
170 | .size = sizeof(struct cmg_chars), | |
171 | .read = chp_measurement_chars_read, | |
172 | }; | |
173 | ||
174 | static void chp_measurement_copy_block(struct cmg_entry *buf, | |
175 | struct channel_subsystem *css, | |
176 | struct chp_id chpid) | |
177 | { | |
178 | void *area; | |
179 | struct cmg_entry *entry, reference_buf; | |
180 | int idx; | |
181 | ||
182 | if (chpid.id < 128) { | |
183 | area = css->cub_addr1; | |
184 | idx = chpid.id; | |
185 | } else { | |
186 | area = css->cub_addr2; | |
187 | idx = chpid.id - 128; | |
188 | } | |
189 | entry = area + (idx * sizeof(struct cmg_entry)); | |
190 | do { | |
191 | memcpy(buf, entry, sizeof(*entry)); | |
192 | memcpy(&reference_buf, entry, sizeof(*entry)); | |
193 | } while (reference_buf.values[0] != buf->values[0]); | |
194 | } | |
195 | ||
91a69029 ZR |
196 | static ssize_t chp_measurement_read(struct kobject *kobj, |
197 | struct bin_attribute *bin_attr, | |
198 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
199 | { |
200 | struct channel_path *chp; | |
201 | struct channel_subsystem *css; | |
202 | unsigned int size; | |
203 | ||
204 | chp = to_channelpath(container_of(kobj, struct device, kobj)); | |
205 | css = to_css(chp->dev.parent); | |
206 | ||
207 | size = sizeof(struct cmg_entry); | |
208 | ||
209 | /* Only allow single reads. */ | |
210 | if (off || count < size) | |
211 | return 0; | |
212 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); | |
213 | count = size; | |
214 | return count; | |
215 | } | |
216 | ||
217 | static struct bin_attribute chp_measurement_attr = { | |
218 | .attr = { | |
219 | .name = "measurement", | |
220 | .mode = S_IRUSR, | |
e6b6e10a PO |
221 | }, |
222 | .size = sizeof(struct cmg_entry), | |
223 | .read = chp_measurement_read, | |
224 | }; | |
225 | ||
226 | void chp_remove_cmg_attr(struct channel_path *chp) | |
227 | { | |
228 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
229 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); | |
230 | } | |
231 | ||
232 | int chp_add_cmg_attr(struct channel_path *chp) | |
233 | { | |
234 | int ret; | |
235 | ||
236 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
237 | if (ret) | |
238 | return ret; | |
239 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); | |
240 | if (ret) | |
241 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
242 | return ret; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Files for the channel path entries. | |
247 | */ | |
248 | static ssize_t chp_status_show(struct device *dev, | |
249 | struct device_attribute *attr, char *buf) | |
250 | { | |
251 | struct channel_path *chp = container_of(dev, struct channel_path, dev); | |
252 | ||
253 | if (!chp) | |
254 | return 0; | |
255 | return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") : | |
256 | sprintf(buf, "offline\n")); | |
257 | } | |
258 | ||
259 | static ssize_t chp_status_write(struct device *dev, | |
260 | struct device_attribute *attr, | |
261 | const char *buf, size_t count) | |
262 | { | |
263 | struct channel_path *cp = container_of(dev, struct channel_path, dev); | |
264 | char cmd[10]; | |
265 | int num_args; | |
266 | int error; | |
267 | ||
268 | num_args = sscanf(buf, "%5s", cmd); | |
269 | if (!num_args) | |
270 | return count; | |
271 | ||
272 | if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) | |
273 | error = s390_vary_chpid(cp->chpid, 1); | |
274 | else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) | |
275 | error = s390_vary_chpid(cp->chpid, 0); | |
276 | else | |
277 | error = -EINVAL; | |
278 | ||
279 | return error < 0 ? error : count; | |
280 | ||
281 | } | |
282 | ||
283 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); | |
284 | ||
e5854a58 PO |
285 | static ssize_t chp_configure_show(struct device *dev, |
286 | struct device_attribute *attr, char *buf) | |
287 | { | |
288 | struct channel_path *cp; | |
289 | int status; | |
290 | ||
291 | cp = container_of(dev, struct channel_path, dev); | |
292 | status = chp_info_get_status(cp->chpid); | |
293 | if (status < 0) | |
294 | return status; | |
295 | ||
296 | return snprintf(buf, PAGE_SIZE, "%d\n", status); | |
297 | } | |
298 | ||
299 | static int cfg_wait_idle(void); | |
300 | ||
301 | static ssize_t chp_configure_write(struct device *dev, | |
302 | struct device_attribute *attr, | |
303 | const char *buf, size_t count) | |
304 | { | |
305 | struct channel_path *cp; | |
306 | int val; | |
307 | char delim; | |
308 | ||
309 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
310 | return -EINVAL; | |
311 | if (val != 0 && val != 1) | |
312 | return -EINVAL; | |
313 | cp = container_of(dev, struct channel_path, dev); | |
314 | chp_cfg_schedule(cp->chpid, val); | |
315 | cfg_wait_idle(); | |
316 | ||
317 | return count; | |
318 | } | |
319 | ||
320 | static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); | |
321 | ||
e6b6e10a PO |
322 | static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
323 | char *buf) | |
324 | { | |
325 | struct channel_path *chp = container_of(dev, struct channel_path, dev); | |
326 | ||
327 | if (!chp) | |
328 | return 0; | |
329 | return sprintf(buf, "%x\n", chp->desc.desc); | |
330 | } | |
331 | ||
332 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); | |
333 | ||
334 | static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, | |
335 | char *buf) | |
336 | { | |
337 | struct channel_path *chp = to_channelpath(dev); | |
338 | ||
339 | if (!chp) | |
340 | return 0; | |
341 | if (chp->cmg == -1) /* channel measurements not available */ | |
342 | return sprintf(buf, "unknown\n"); | |
343 | return sprintf(buf, "%x\n", chp->cmg); | |
344 | } | |
345 | ||
346 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); | |
347 | ||
348 | static ssize_t chp_shared_show(struct device *dev, | |
349 | struct device_attribute *attr, char *buf) | |
350 | { | |
351 | struct channel_path *chp = to_channelpath(dev); | |
352 | ||
353 | if (!chp) | |
354 | return 0; | |
355 | if (chp->shared == -1) /* channel measurements not available */ | |
356 | return sprintf(buf, "unknown\n"); | |
357 | return sprintf(buf, "%x\n", chp->shared); | |
358 | } | |
359 | ||
360 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); | |
361 | ||
362 | static struct attribute * chp_attrs[] = { | |
363 | &dev_attr_status.attr, | |
e5854a58 | 364 | &dev_attr_configure.attr, |
e6b6e10a PO |
365 | &dev_attr_type.attr, |
366 | &dev_attr_cmg.attr, | |
367 | &dev_attr_shared.attr, | |
368 | NULL, | |
369 | }; | |
370 | ||
371 | static struct attribute_group chp_attr_group = { | |
372 | .attrs = chp_attrs, | |
373 | }; | |
374 | ||
375 | static void chp_release(struct device *dev) | |
376 | { | |
377 | struct channel_path *cp; | |
378 | ||
379 | cp = container_of(dev, struct channel_path, dev); | |
380 | kfree(cp); | |
381 | } | |
382 | ||
383 | /** | |
384 | * chp_new - register a new channel-path | |
385 | * @chpid - channel-path ID | |
386 | * | |
387 | * Create and register data structure representing new channel-path. Return | |
388 | * zero on success, non-zero otherwise. | |
389 | */ | |
390 | int chp_new(struct chp_id chpid) | |
391 | { | |
392 | struct channel_path *chp; | |
393 | int ret; | |
394 | ||
e5854a58 PO |
395 | if (chp_is_registered(chpid)) |
396 | return 0; | |
e6b6e10a PO |
397 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
398 | if (!chp) | |
399 | return -ENOMEM; | |
400 | ||
401 | /* fill in status, etc. */ | |
402 | chp->chpid = chpid; | |
403 | chp->state = 1; | |
404 | chp->dev.parent = &css[chpid.cssid]->device; | |
405 | chp->dev.release = chp_release; | |
406 | snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid, | |
407 | chpid.id); | |
408 | ||
409 | /* Obtain channel path description and fill it in. */ | |
410 | ret = chsc_determine_channel_path_description(chpid, &chp->desc); | |
411 | if (ret) | |
412 | goto out_free; | |
c9182e0f PO |
413 | if ((chp->desc.flags & 0x80) == 0) { |
414 | ret = -ENODEV; | |
415 | goto out_free; | |
416 | } | |
e6b6e10a PO |
417 | /* Get channel-measurement characteristics. */ |
418 | if (css_characteristics_avail && css_chsc_characteristics.scmc | |
419 | && css_chsc_characteristics.secm) { | |
420 | ret = chsc_get_channel_measurement_chars(chp); | |
421 | if (ret) | |
422 | goto out_free; | |
423 | } else { | |
424 | static int msg_done; | |
425 | ||
426 | if (!msg_done) { | |
427 | printk(KERN_WARNING "cio: Channel measurements not " | |
428 | "available, continuing.\n"); | |
429 | msg_done = 1; | |
430 | } | |
431 | chp->cmg = -1; | |
432 | } | |
433 | ||
434 | /* make it known to the system */ | |
435 | ret = device_register(&chp->dev); | |
436 | if (ret) { | |
437 | printk(KERN_WARNING "%s: could not register %x.%02x\n", | |
438 | __func__, chpid.cssid, chpid.id); | |
439 | goto out_free; | |
440 | } | |
441 | ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group); | |
442 | if (ret) { | |
443 | device_unregister(&chp->dev); | |
444 | goto out_free; | |
445 | } | |
446 | mutex_lock(&css[chpid.cssid]->mutex); | |
447 | if (css[chpid.cssid]->cm_enabled) { | |
448 | ret = chp_add_cmg_attr(chp); | |
449 | if (ret) { | |
450 | sysfs_remove_group(&chp->dev.kobj, &chp_attr_group); | |
451 | device_unregister(&chp->dev); | |
452 | mutex_unlock(&css[chpid.cssid]->mutex); | |
453 | goto out_free; | |
454 | } | |
455 | } | |
456 | css[chpid.cssid]->chps[chpid.id] = chp; | |
457 | mutex_unlock(&css[chpid.cssid]->mutex); | |
458 | return ret; | |
459 | out_free: | |
460 | kfree(chp); | |
461 | return ret; | |
462 | } | |
463 | ||
464 | /** | |
465 | * chp_get_chp_desc - return newly allocated channel-path description | |
466 | * @chpid: channel-path ID | |
467 | * | |
468 | * On success return a newly allocated copy of the channel-path description | |
469 | * data associated with the given channel-path ID. Return %NULL on error. | |
470 | */ | |
471 | void *chp_get_chp_desc(struct chp_id chpid) | |
472 | { | |
473 | struct channel_path *chp; | |
474 | struct channel_path_desc *desc; | |
475 | ||
476 | chp = chpid_to_chp(chpid); | |
477 | if (!chp) | |
478 | return NULL; | |
479 | desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); | |
480 | if (!desc) | |
481 | return NULL; | |
482 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); | |
483 | return desc; | |
484 | } | |
485 | ||
486 | /** | |
487 | * chp_process_crw - process channel-path status change | |
488 | * @id: channel-path ID number | |
489 | * @status: non-zero if channel-path has become available, zero otherwise | |
490 | * | |
491 | * Handle channel-report-words indicating that the status of a channel-path | |
492 | * has changed. | |
493 | */ | |
83b3370c | 494 | void chp_process_crw(int id, int status) |
e6b6e10a PO |
495 | { |
496 | struct chp_id chpid; | |
497 | ||
498 | chp_id_init(&chpid); | |
499 | chpid.id = id; | |
500 | if (status) { | |
501 | if (!chp_is_registered(chpid)) | |
502 | chp_new(chpid); | |
83b3370c PO |
503 | chsc_chp_online(chpid); |
504 | } else | |
e6b6e10a | 505 | chsc_chp_offline(chpid); |
e6b6e10a | 506 | } |
e5854a58 PO |
507 | |
508 | static inline int info_bit_num(struct chp_id id) | |
509 | { | |
510 | return id.id + id.cssid * (__MAX_CHPID + 1); | |
511 | } | |
512 | ||
513 | /* Force chp_info refresh on next call to info_validate(). */ | |
514 | static void info_expire(void) | |
515 | { | |
516 | mutex_lock(&info_lock); | |
517 | chp_info_expires = jiffies - 1; | |
518 | mutex_unlock(&info_lock); | |
519 | } | |
520 | ||
521 | /* Ensure that chp_info is up-to-date. */ | |
522 | static int info_update(void) | |
523 | { | |
524 | int rc; | |
525 | ||
526 | mutex_lock(&info_lock); | |
527 | rc = 0; | |
528 | if (time_after(jiffies, chp_info_expires)) { | |
529 | /* Data is too old, update. */ | |
530 | rc = sclp_chp_read_info(&chp_info); | |
531 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; | |
532 | } | |
533 | mutex_unlock(&info_lock); | |
534 | ||
535 | return rc; | |
536 | } | |
537 | ||
538 | /** | |
539 | * chp_info_get_status - retrieve configure status of a channel-path | |
540 | * @chpid: channel-path ID | |
541 | * | |
542 | * On success, return 0 for standby, 1 for configured, 2 for reserved, | |
543 | * 3 for not recognized. Return negative error code on error. | |
544 | */ | |
545 | int chp_info_get_status(struct chp_id chpid) | |
546 | { | |
547 | int rc; | |
548 | int bit; | |
549 | ||
550 | rc = info_update(); | |
551 | if (rc) | |
552 | return rc; | |
553 | ||
554 | bit = info_bit_num(chpid); | |
555 | mutex_lock(&info_lock); | |
556 | if (!chp_test_bit(chp_info.recognized, bit)) | |
557 | rc = CHP_STATUS_NOT_RECOGNIZED; | |
558 | else if (chp_test_bit(chp_info.configured, bit)) | |
559 | rc = CHP_STATUS_CONFIGURED; | |
560 | else if (chp_test_bit(chp_info.standby, bit)) | |
561 | rc = CHP_STATUS_STANDBY; | |
562 | else | |
563 | rc = CHP_STATUS_RESERVED; | |
564 | mutex_unlock(&info_lock); | |
565 | ||
566 | return rc; | |
567 | } | |
568 | ||
569 | /* Return configure task for chpid. */ | |
570 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) | |
571 | { | |
572 | return chp_cfg_task[chpid.cssid][chpid.id]; | |
573 | } | |
574 | ||
575 | /* Set configure task for chpid. */ | |
576 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) | |
577 | { | |
578 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; | |
579 | } | |
580 | ||
581 | /* Perform one configure/deconfigure request. Reschedule work function until | |
582 | * last request. */ | |
583 | static void cfg_func(struct work_struct *work) | |
584 | { | |
585 | struct chp_id chpid; | |
586 | enum cfg_task_t t; | |
587 | ||
588 | mutex_lock(&cfg_lock); | |
589 | t = cfg_none; | |
590 | chp_id_for_each(&chpid) { | |
591 | t = cfg_get_task(chpid); | |
592 | if (t != cfg_none) { | |
593 | cfg_set_task(chpid, cfg_none); | |
594 | break; | |
595 | } | |
596 | } | |
597 | mutex_unlock(&cfg_lock); | |
598 | ||
599 | switch (t) { | |
600 | case cfg_configure: | |
601 | sclp_chp_configure(chpid); | |
602 | info_expire(); | |
603 | chsc_chp_online(chpid); | |
604 | break; | |
605 | case cfg_deconfigure: | |
606 | sclp_chp_deconfigure(chpid); | |
607 | info_expire(); | |
608 | chsc_chp_offline(chpid); | |
609 | break; | |
610 | case cfg_none: | |
611 | /* Get updated information after last change. */ | |
612 | info_update(); | |
613 | mutex_lock(&cfg_lock); | |
614 | cfg_busy = 0; | |
615 | mutex_unlock(&cfg_lock); | |
616 | wake_up_interruptible(&cfg_wait_queue); | |
617 | return; | |
618 | } | |
619 | queue_work(chp_wq, &cfg_work); | |
620 | } | |
621 | ||
622 | /** | |
623 | * chp_cfg_schedule - schedule chpid configuration request | |
624 | * @chpid - channel-path ID | |
625 | * @configure - Non-zero for configure, zero for deconfigure | |
626 | * | |
627 | * Schedule a channel-path configuration/deconfiguration request. | |
628 | */ | |
629 | void chp_cfg_schedule(struct chp_id chpid, int configure) | |
630 | { | |
631 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, | |
632 | configure); | |
633 | mutex_lock(&cfg_lock); | |
634 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); | |
635 | cfg_busy = 1; | |
636 | mutex_unlock(&cfg_lock); | |
637 | queue_work(chp_wq, &cfg_work); | |
638 | } | |
639 | ||
640 | /** | |
641 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request | |
642 | * @chpid - channel-path ID | |
643 | * | |
644 | * Cancel an active channel-path deconfiguration request if it has not yet | |
645 | * been performed. | |
646 | */ | |
647 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) | |
648 | { | |
649 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); | |
650 | mutex_lock(&cfg_lock); | |
651 | if (cfg_get_task(chpid) == cfg_deconfigure) | |
652 | cfg_set_task(chpid, cfg_none); | |
653 | mutex_unlock(&cfg_lock); | |
654 | } | |
655 | ||
656 | static int cfg_wait_idle(void) | |
657 | { | |
658 | if (wait_event_interruptible(cfg_wait_queue, !cfg_busy)) | |
659 | return -ERESTARTSYS; | |
660 | return 0; | |
661 | } | |
662 | ||
663 | static int __init chp_init(void) | |
664 | { | |
665 | struct chp_id chpid; | |
666 | ||
667 | chp_wq = create_singlethread_workqueue("cio_chp"); | |
668 | if (!chp_wq) | |
669 | return -ENOMEM; | |
670 | INIT_WORK(&cfg_work, cfg_func); | |
671 | init_waitqueue_head(&cfg_wait_queue); | |
672 | if (info_update()) | |
673 | return 0; | |
674 | /* Register available channel-paths. */ | |
675 | chp_id_for_each(&chpid) { | |
676 | if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED) | |
677 | chp_new(chpid); | |
678 | } | |
679 | ||
680 | return 0; | |
681 | } | |
682 | ||
683 | subsys_initcall(chp_init); |