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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> | |
a0ea22c3 | 17 | #include <linux/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45 | /* Time after which channel-path status may be outdated.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 | { | |
7c9f4e3a | 58 | return channel_subsystems[chpid.cssid]->chps[chpid.id]; |
e6b6e10a PO |
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); | |
a0ea22c3 | 89 | for (i = 0; i < 8; i++) { |
e6b6e10a PO |
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); | |
a0ea22c3 | 121 | CIO_TRACE_EVENT(2, dbf_text); |
e6b6e10a PO |
122 | |
123 | status = chp_get_status(chpid); | |
e6b6e10a | 124 | if (!on && !status) { |
e556bbbd | 125 | printk(KERN_ERR "cio: chpid %x.%02x is already offline\n", |
e6b6e10a PO |
126 | chpid.cssid, chpid.id); |
127 | return -EINVAL; | |
128 | } | |
129 | ||
130 | set_chp_logically_online(chpid, on); | |
131 | chsc_chp_vary(chpid, on); | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Channel measurement related functions | |
137 | */ | |
91a69029 ZR |
138 | static ssize_t chp_measurement_chars_read(struct kobject *kobj, |
139 | struct bin_attribute *bin_attr, | |
140 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
141 | { |
142 | struct channel_path *chp; | |
364c8558 | 143 | struct device *device; |
e6b6e10a PO |
144 | unsigned int size; |
145 | ||
364c8558 HC |
146 | device = container_of(kobj, struct device, kobj); |
147 | chp = to_channelpath(device); | |
e6b6e10a PO |
148 | if (!chp->cmg_chars) |
149 | return 0; | |
150 | ||
151 | size = sizeof(struct cmg_chars); | |
152 | ||
153 | if (off > size) | |
154 | return 0; | |
155 | if (off + count > size) | |
156 | count = size - off; | |
157 | memcpy(buf, chp->cmg_chars + off, count); | |
158 | return count; | |
159 | } | |
160 | ||
161 | static struct bin_attribute chp_measurement_chars_attr = { | |
162 | .attr = { | |
163 | .name = "measurement_chars", | |
164 | .mode = S_IRUSR, | |
e6b6e10a PO |
165 | }, |
166 | .size = sizeof(struct cmg_chars), | |
167 | .read = chp_measurement_chars_read, | |
168 | }; | |
169 | ||
170 | static void chp_measurement_copy_block(struct cmg_entry *buf, | |
171 | struct channel_subsystem *css, | |
172 | struct chp_id chpid) | |
173 | { | |
174 | void *area; | |
175 | struct cmg_entry *entry, reference_buf; | |
176 | int idx; | |
177 | ||
178 | if (chpid.id < 128) { | |
179 | area = css->cub_addr1; | |
180 | idx = chpid.id; | |
181 | } else { | |
182 | area = css->cub_addr2; | |
183 | idx = chpid.id - 128; | |
184 | } | |
185 | entry = area + (idx * sizeof(struct cmg_entry)); | |
186 | do { | |
187 | memcpy(buf, entry, sizeof(*entry)); | |
188 | memcpy(&reference_buf, entry, sizeof(*entry)); | |
189 | } while (reference_buf.values[0] != buf->values[0]); | |
190 | } | |
191 | ||
91a69029 ZR |
192 | static ssize_t chp_measurement_read(struct kobject *kobj, |
193 | struct bin_attribute *bin_attr, | |
194 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
195 | { |
196 | struct channel_path *chp; | |
197 | struct channel_subsystem *css; | |
364c8558 | 198 | struct device *device; |
e6b6e10a PO |
199 | unsigned int size; |
200 | ||
364c8558 HC |
201 | device = container_of(kobj, struct device, kobj); |
202 | chp = to_channelpath(device); | |
e6b6e10a PO |
203 | css = to_css(chp->dev.parent); |
204 | ||
205 | size = sizeof(struct cmg_entry); | |
206 | ||
207 | /* Only allow single reads. */ | |
208 | if (off || count < size) | |
209 | return 0; | |
210 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); | |
211 | count = size; | |
212 | return count; | |
213 | } | |
214 | ||
215 | static struct bin_attribute chp_measurement_attr = { | |
216 | .attr = { | |
217 | .name = "measurement", | |
218 | .mode = S_IRUSR, | |
e6b6e10a PO |
219 | }, |
220 | .size = sizeof(struct cmg_entry), | |
221 | .read = chp_measurement_read, | |
222 | }; | |
223 | ||
224 | void chp_remove_cmg_attr(struct channel_path *chp) | |
225 | { | |
226 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
227 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); | |
228 | } | |
229 | ||
230 | int chp_add_cmg_attr(struct channel_path *chp) | |
231 | { | |
232 | int ret; | |
233 | ||
234 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
235 | if (ret) | |
236 | return ret; | |
237 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); | |
238 | if (ret) | |
239 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
240 | return ret; | |
241 | } | |
242 | ||
243 | /* | |
244 | * Files for the channel path entries. | |
245 | */ | |
246 | static ssize_t chp_status_show(struct device *dev, | |
247 | struct device_attribute *attr, char *buf) | |
248 | { | |
05469607 | 249 | struct channel_path *chp = to_channelpath(dev); |
e6b6e10a PO |
250 | |
251 | if (!chp) | |
252 | return 0; | |
253 | return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") : | |
254 | sprintf(buf, "offline\n")); | |
255 | } | |
256 | ||
257 | static ssize_t chp_status_write(struct device *dev, | |
258 | struct device_attribute *attr, | |
259 | const char *buf, size_t count) | |
260 | { | |
05469607 | 261 | struct channel_path *cp = to_channelpath(dev); |
e6b6e10a PO |
262 | char cmd[10]; |
263 | int num_args; | |
264 | int error; | |
265 | ||
266 | num_args = sscanf(buf, "%5s", cmd); | |
267 | if (!num_args) | |
268 | return count; | |
269 | ||
270 | if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) | |
271 | error = s390_vary_chpid(cp->chpid, 1); | |
272 | else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) | |
273 | error = s390_vary_chpid(cp->chpid, 0); | |
274 | else | |
275 | error = -EINVAL; | |
276 | ||
277 | return error < 0 ? error : count; | |
278 | ||
279 | } | |
280 | ||
281 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); | |
282 | ||
e5854a58 PO |
283 | static ssize_t chp_configure_show(struct device *dev, |
284 | struct device_attribute *attr, char *buf) | |
285 | { | |
286 | struct channel_path *cp; | |
287 | int status; | |
288 | ||
05469607 | 289 | cp = to_channelpath(dev); |
e5854a58 PO |
290 | status = chp_info_get_status(cp->chpid); |
291 | if (status < 0) | |
292 | return status; | |
293 | ||
294 | return snprintf(buf, PAGE_SIZE, "%d\n", status); | |
295 | } | |
296 | ||
297 | static int cfg_wait_idle(void); | |
298 | ||
299 | static ssize_t chp_configure_write(struct device *dev, | |
300 | struct device_attribute *attr, | |
301 | const char *buf, size_t count) | |
302 | { | |
303 | struct channel_path *cp; | |
304 | int val; | |
305 | char delim; | |
306 | ||
307 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
308 | return -EINVAL; | |
309 | if (val != 0 && val != 1) | |
310 | return -EINVAL; | |
05469607 | 311 | cp = to_channelpath(dev); |
e5854a58 PO |
312 | chp_cfg_schedule(cp->chpid, val); |
313 | cfg_wait_idle(); | |
314 | ||
315 | return count; | |
316 | } | |
317 | ||
318 | static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); | |
319 | ||
e6b6e10a PO |
320 | static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
321 | char *buf) | |
322 | { | |
05469607 | 323 | struct channel_path *chp = to_channelpath(dev); |
e6b6e10a PO |
324 | |
325 | if (!chp) | |
326 | return 0; | |
327 | return sprintf(buf, "%x\n", chp->desc.desc); | |
328 | } | |
329 | ||
330 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); | |
331 | ||
332 | static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, | |
333 | char *buf) | |
334 | { | |
335 | struct channel_path *chp = to_channelpath(dev); | |
336 | ||
337 | if (!chp) | |
338 | return 0; | |
339 | if (chp->cmg == -1) /* channel measurements not available */ | |
340 | return sprintf(buf, "unknown\n"); | |
341 | return sprintf(buf, "%x\n", chp->cmg); | |
342 | } | |
343 | ||
344 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); | |
345 | ||
346 | static ssize_t chp_shared_show(struct device *dev, | |
347 | struct device_attribute *attr, char *buf) | |
348 | { | |
349 | struct channel_path *chp = to_channelpath(dev); | |
350 | ||
351 | if (!chp) | |
352 | return 0; | |
353 | if (chp->shared == -1) /* channel measurements not available */ | |
354 | return sprintf(buf, "unknown\n"); | |
355 | return sprintf(buf, "%x\n", chp->shared); | |
356 | } | |
357 | ||
358 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); | |
359 | ||
a0ea22c3 | 360 | static struct attribute *chp_attrs[] = { |
e6b6e10a | 361 | &dev_attr_status.attr, |
e5854a58 | 362 | &dev_attr_configure.attr, |
e6b6e10a PO |
363 | &dev_attr_type.attr, |
364 | &dev_attr_cmg.attr, | |
365 | &dev_attr_shared.attr, | |
366 | NULL, | |
367 | }; | |
368 | ||
369 | static struct attribute_group chp_attr_group = { | |
370 | .attrs = chp_attrs, | |
371 | }; | |
372 | ||
373 | static void chp_release(struct device *dev) | |
374 | { | |
375 | struct channel_path *cp; | |
376 | ||
05469607 | 377 | cp = to_channelpath(dev); |
e6b6e10a PO |
378 | kfree(cp); |
379 | } | |
380 | ||
381 | /** | |
382 | * chp_new - register a new channel-path | |
383 | * @chpid - channel-path ID | |
384 | * | |
385 | * Create and register data structure representing new channel-path. Return | |
386 | * zero on success, non-zero otherwise. | |
387 | */ | |
388 | int chp_new(struct chp_id chpid) | |
389 | { | |
390 | struct channel_path *chp; | |
391 | int ret; | |
392 | ||
e5854a58 PO |
393 | if (chp_is_registered(chpid)) |
394 | return 0; | |
e6b6e10a PO |
395 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
396 | if (!chp) | |
397 | return -ENOMEM; | |
398 | ||
399 | /* fill in status, etc. */ | |
400 | chp->chpid = chpid; | |
401 | chp->state = 1; | |
7c9f4e3a | 402 | chp->dev.parent = &channel_subsystems[chpid.cssid]->device; |
e6b6e10a PO |
403 | chp->dev.release = chp_release; |
404 | snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid, | |
405 | chpid.id); | |
406 | ||
407 | /* Obtain channel path description and fill it in. */ | |
408 | ret = chsc_determine_channel_path_description(chpid, &chp->desc); | |
409 | if (ret) | |
410 | goto out_free; | |
c9182e0f PO |
411 | if ((chp->desc.flags & 0x80) == 0) { |
412 | ret = -ENODEV; | |
413 | goto out_free; | |
414 | } | |
e6b6e10a PO |
415 | /* Get channel-measurement characteristics. */ |
416 | if (css_characteristics_avail && css_chsc_characteristics.scmc | |
417 | && css_chsc_characteristics.secm) { | |
418 | ret = chsc_get_channel_measurement_chars(chp); | |
419 | if (ret) | |
420 | goto out_free; | |
421 | } else { | |
e6b6e10a PO |
422 | chp->cmg = -1; |
423 | } | |
424 | ||
425 | /* make it known to the system */ | |
426 | ret = device_register(&chp->dev); | |
427 | if (ret) { | |
e556bbbd CH |
428 | CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
429 | chpid.cssid, chpid.id, ret); | |
e6b6e10a PO |
430 | goto out_free; |
431 | } | |
432 | ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group); | |
433 | if (ret) { | |
434 | device_unregister(&chp->dev); | |
435 | goto out_free; | |
436 | } | |
7c9f4e3a CH |
437 | mutex_lock(&channel_subsystems[chpid.cssid]->mutex); |
438 | if (channel_subsystems[chpid.cssid]->cm_enabled) { | |
e6b6e10a PO |
439 | ret = chp_add_cmg_attr(chp); |
440 | if (ret) { | |
441 | sysfs_remove_group(&chp->dev.kobj, &chp_attr_group); | |
442 | device_unregister(&chp->dev); | |
7c9f4e3a | 443 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); |
e6b6e10a PO |
444 | goto out_free; |
445 | } | |
446 | } | |
7c9f4e3a CH |
447 | channel_subsystems[chpid.cssid]->chps[chpid.id] = chp; |
448 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); | |
e6b6e10a PO |
449 | return ret; |
450 | out_free: | |
451 | kfree(chp); | |
452 | return ret; | |
453 | } | |
454 | ||
455 | /** | |
456 | * chp_get_chp_desc - return newly allocated channel-path description | |
457 | * @chpid: channel-path ID | |
458 | * | |
459 | * On success return a newly allocated copy of the channel-path description | |
460 | * data associated with the given channel-path ID. Return %NULL on error. | |
461 | */ | |
462 | void *chp_get_chp_desc(struct chp_id chpid) | |
463 | { | |
464 | struct channel_path *chp; | |
465 | struct channel_path_desc *desc; | |
466 | ||
467 | chp = chpid_to_chp(chpid); | |
468 | if (!chp) | |
469 | return NULL; | |
470 | desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); | |
471 | if (!desc) | |
472 | return NULL; | |
473 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); | |
474 | return desc; | |
475 | } | |
476 | ||
477 | /** | |
478 | * chp_process_crw - process channel-path status change | |
479 | * @id: channel-path ID number | |
480 | * @status: non-zero if channel-path has become available, zero otherwise | |
481 | * | |
482 | * Handle channel-report-words indicating that the status of a channel-path | |
483 | * has changed. | |
484 | */ | |
83b3370c | 485 | void chp_process_crw(int id, int status) |
e6b6e10a PO |
486 | { |
487 | struct chp_id chpid; | |
488 | ||
489 | chp_id_init(&chpid); | |
490 | chpid.id = id; | |
491 | if (status) { | |
492 | if (!chp_is_registered(chpid)) | |
493 | chp_new(chpid); | |
83b3370c PO |
494 | chsc_chp_online(chpid); |
495 | } else | |
e6b6e10a | 496 | chsc_chp_offline(chpid); |
e6b6e10a | 497 | } |
e5854a58 PO |
498 | |
499 | static inline int info_bit_num(struct chp_id id) | |
500 | { | |
501 | return id.id + id.cssid * (__MAX_CHPID + 1); | |
502 | } | |
503 | ||
504 | /* Force chp_info refresh on next call to info_validate(). */ | |
505 | static void info_expire(void) | |
506 | { | |
507 | mutex_lock(&info_lock); | |
508 | chp_info_expires = jiffies - 1; | |
509 | mutex_unlock(&info_lock); | |
510 | } | |
511 | ||
512 | /* Ensure that chp_info is up-to-date. */ | |
513 | static int info_update(void) | |
514 | { | |
515 | int rc; | |
516 | ||
517 | mutex_lock(&info_lock); | |
518 | rc = 0; | |
519 | if (time_after(jiffies, chp_info_expires)) { | |
520 | /* Data is too old, update. */ | |
521 | rc = sclp_chp_read_info(&chp_info); | |
522 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; | |
523 | } | |
524 | mutex_unlock(&info_lock); | |
525 | ||
526 | return rc; | |
527 | } | |
528 | ||
529 | /** | |
530 | * chp_info_get_status - retrieve configure status of a channel-path | |
531 | * @chpid: channel-path ID | |
532 | * | |
533 | * On success, return 0 for standby, 1 for configured, 2 for reserved, | |
534 | * 3 for not recognized. Return negative error code on error. | |
535 | */ | |
536 | int chp_info_get_status(struct chp_id chpid) | |
537 | { | |
538 | int rc; | |
539 | int bit; | |
540 | ||
541 | rc = info_update(); | |
542 | if (rc) | |
543 | return rc; | |
544 | ||
545 | bit = info_bit_num(chpid); | |
546 | mutex_lock(&info_lock); | |
547 | if (!chp_test_bit(chp_info.recognized, bit)) | |
548 | rc = CHP_STATUS_NOT_RECOGNIZED; | |
549 | else if (chp_test_bit(chp_info.configured, bit)) | |
550 | rc = CHP_STATUS_CONFIGURED; | |
551 | else if (chp_test_bit(chp_info.standby, bit)) | |
552 | rc = CHP_STATUS_STANDBY; | |
553 | else | |
554 | rc = CHP_STATUS_RESERVED; | |
555 | mutex_unlock(&info_lock); | |
556 | ||
557 | return rc; | |
558 | } | |
559 | ||
560 | /* Return configure task for chpid. */ | |
561 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) | |
562 | { | |
563 | return chp_cfg_task[chpid.cssid][chpid.id]; | |
564 | } | |
565 | ||
566 | /* Set configure task for chpid. */ | |
567 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) | |
568 | { | |
569 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; | |
570 | } | |
571 | ||
572 | /* Perform one configure/deconfigure request. Reschedule work function until | |
573 | * last request. */ | |
574 | static void cfg_func(struct work_struct *work) | |
575 | { | |
576 | struct chp_id chpid; | |
577 | enum cfg_task_t t; | |
578 | ||
579 | mutex_lock(&cfg_lock); | |
580 | t = cfg_none; | |
581 | chp_id_for_each(&chpid) { | |
582 | t = cfg_get_task(chpid); | |
583 | if (t != cfg_none) { | |
584 | cfg_set_task(chpid, cfg_none); | |
585 | break; | |
586 | } | |
587 | } | |
588 | mutex_unlock(&cfg_lock); | |
589 | ||
590 | switch (t) { | |
591 | case cfg_configure: | |
592 | sclp_chp_configure(chpid); | |
593 | info_expire(); | |
594 | chsc_chp_online(chpid); | |
595 | break; | |
596 | case cfg_deconfigure: | |
597 | sclp_chp_deconfigure(chpid); | |
598 | info_expire(); | |
599 | chsc_chp_offline(chpid); | |
600 | break; | |
601 | case cfg_none: | |
602 | /* Get updated information after last change. */ | |
603 | info_update(); | |
604 | mutex_lock(&cfg_lock); | |
605 | cfg_busy = 0; | |
606 | mutex_unlock(&cfg_lock); | |
607 | wake_up_interruptible(&cfg_wait_queue); | |
608 | return; | |
609 | } | |
610 | queue_work(chp_wq, &cfg_work); | |
611 | } | |
612 | ||
613 | /** | |
614 | * chp_cfg_schedule - schedule chpid configuration request | |
615 | * @chpid - channel-path ID | |
616 | * @configure - Non-zero for configure, zero for deconfigure | |
617 | * | |
618 | * Schedule a channel-path configuration/deconfiguration request. | |
619 | */ | |
620 | void chp_cfg_schedule(struct chp_id chpid, int configure) | |
621 | { | |
622 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, | |
623 | configure); | |
624 | mutex_lock(&cfg_lock); | |
625 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); | |
626 | cfg_busy = 1; | |
627 | mutex_unlock(&cfg_lock); | |
628 | queue_work(chp_wq, &cfg_work); | |
629 | } | |
630 | ||
631 | /** | |
632 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request | |
633 | * @chpid - channel-path ID | |
634 | * | |
635 | * Cancel an active channel-path deconfiguration request if it has not yet | |
636 | * been performed. | |
637 | */ | |
638 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) | |
639 | { | |
640 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); | |
641 | mutex_lock(&cfg_lock); | |
642 | if (cfg_get_task(chpid) == cfg_deconfigure) | |
643 | cfg_set_task(chpid, cfg_none); | |
644 | mutex_unlock(&cfg_lock); | |
645 | } | |
646 | ||
647 | static int cfg_wait_idle(void) | |
648 | { | |
649 | if (wait_event_interruptible(cfg_wait_queue, !cfg_busy)) | |
650 | return -ERESTARTSYS; | |
651 | return 0; | |
652 | } | |
653 | ||
654 | static int __init chp_init(void) | |
655 | { | |
656 | struct chp_id chpid; | |
657 | ||
658 | chp_wq = create_singlethread_workqueue("cio_chp"); | |
659 | if (!chp_wq) | |
660 | return -ENOMEM; | |
661 | INIT_WORK(&cfg_work, cfg_func); | |
662 | init_waitqueue_head(&cfg_wait_queue); | |
663 | if (info_update()) | |
664 | return 0; | |
665 | /* Register available channel-paths. */ | |
666 | chp_id_for_each(&chpid) { | |
667 | if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED) | |
668 | chp_new(chpid); | |
669 | } | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | subsys_initcall(chp_init); |