Commit | Line | Data |
---|---|---|
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> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e5854a58 PO |
19 | #include <asm/chpid.h> |
20 | #include <asm/sclp.h> | |
f5daba1d | 21 | #include <asm/crw.h> |
e6b6e10a | 22 | |
e6b6e10a PO |
23 | #include "cio.h" |
24 | #include "css.h" | |
25 | #include "ioasm.h" | |
26 | #include "cio_debug.h" | |
27 | #include "chp.h" | |
28 | ||
29 | #define to_channelpath(device) container_of(device, struct channel_path, dev) | |
e5854a58 PO |
30 | #define CHP_INFO_UPDATE_INTERVAL 1*HZ |
31 | ||
32 | enum cfg_task_t { | |
33 | cfg_none, | |
34 | cfg_configure, | |
35 | cfg_deconfigure | |
36 | }; | |
37 | ||
38 | /* Map for pending configure tasks. */ | |
39 | static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1]; | |
40 | static DEFINE_MUTEX(cfg_lock); | |
41 | static int cfg_busy; | |
42 | ||
43 | /* Map for channel-path status. */ | |
44 | static struct sclp_chp_info chp_info; | |
45 | static DEFINE_MUTEX(info_lock); | |
46 | ||
47 | /* Time after which channel-path status may be outdated. */ | |
48 | static unsigned long chp_info_expires; | |
49 | ||
50 | /* Workqueue to perform pending configure tasks. */ | |
51 | static struct workqueue_struct *chp_wq; | |
52 | static struct work_struct cfg_work; | |
53 | ||
54 | /* Wait queue for configure completion events. */ | |
55 | static wait_queue_head_t cfg_wait_queue; | |
e6b6e10a PO |
56 | |
57 | /* Return channel_path struct for given chpid. */ | |
58 | static inline struct channel_path *chpid_to_chp(struct chp_id chpid) | |
59 | { | |
7c9f4e3a | 60 | return channel_subsystems[chpid.cssid]->chps[chpid.id]; |
e6b6e10a PO |
61 | } |
62 | ||
63 | /* Set vary state for given chpid. */ | |
64 | static void set_chp_logically_online(struct chp_id chpid, int onoff) | |
65 | { | |
66 | chpid_to_chp(chpid)->state = onoff; | |
67 | } | |
68 | ||
af901ca1 | 69 | /* On success return 0 if channel-path is varied offline, 1 if it is varied |
e6b6e10a PO |
70 | * online. Return -ENODEV if channel-path is not registered. */ |
71 | int chp_get_status(struct chp_id chpid) | |
72 | { | |
73 | return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); | |
74 | } | |
75 | ||
76 | /** | |
77 | * chp_get_sch_opm - return opm for subchannel | |
78 | * @sch: subchannel | |
79 | * | |
80 | * Calculate and return the operational path mask (opm) based on the chpids | |
81 | * used by the subchannel and the status of the associated channel-paths. | |
82 | */ | |
83 | u8 chp_get_sch_opm(struct subchannel *sch) | |
84 | { | |
85 | struct chp_id chpid; | |
86 | int opm; | |
87 | int i; | |
88 | ||
89 | opm = 0; | |
90 | chp_id_init(&chpid); | |
a0ea22c3 | 91 | for (i = 0; i < 8; i++) { |
e6b6e10a PO |
92 | opm <<= 1; |
93 | chpid.id = sch->schib.pmcw.chpid[i]; | |
94 | if (chp_get_status(chpid) != 0) | |
95 | opm |= 1; | |
96 | } | |
97 | return opm; | |
98 | } | |
44a1c19e | 99 | EXPORT_SYMBOL_GPL(chp_get_sch_opm); |
e6b6e10a PO |
100 | |
101 | /** | |
102 | * chp_is_registered - check if a channel-path is registered | |
103 | * @chpid: channel-path ID | |
104 | * | |
105 | * Return non-zero if a channel-path with the given chpid is registered, | |
106 | * zero otherwise. | |
107 | */ | |
108 | int chp_is_registered(struct chp_id chpid) | |
109 | { | |
110 | return chpid_to_chp(chpid) != NULL; | |
111 | } | |
112 | ||
113 | /* | |
114 | * Function: s390_vary_chpid | |
115 | * Varies the specified chpid online or offline | |
116 | */ | |
117 | static int s390_vary_chpid(struct chp_id chpid, int on) | |
118 | { | |
119 | char dbf_text[15]; | |
120 | int status; | |
121 | ||
122 | sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, | |
123 | chpid.id); | |
a0ea22c3 | 124 | CIO_TRACE_EVENT(2, dbf_text); |
e6b6e10a PO |
125 | |
126 | status = chp_get_status(chpid); | |
c78aa6cb ME |
127 | if (!on && !status) |
128 | return 0; | |
e6b6e10a PO |
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 | 144 | |
364c8558 HC |
145 | device = container_of(kobj, struct device, kobj); |
146 | chp = to_channelpath(device); | |
e6b6e10a PO |
147 | if (!chp->cmg_chars) |
148 | return 0; | |
149 | ||
d9cef21a AM |
150 | return memory_read_from_buffer(buf, count, &off, |
151 | chp->cmg_chars, sizeof(struct cmg_chars)); | |
e6b6e10a PO |
152 | } |
153 | ||
154 | static struct bin_attribute chp_measurement_chars_attr = { | |
155 | .attr = { | |
156 | .name = "measurement_chars", | |
157 | .mode = S_IRUSR, | |
e6b6e10a PO |
158 | }, |
159 | .size = sizeof(struct cmg_chars), | |
160 | .read = chp_measurement_chars_read, | |
161 | }; | |
162 | ||
163 | static void chp_measurement_copy_block(struct cmg_entry *buf, | |
164 | struct channel_subsystem *css, | |
165 | struct chp_id chpid) | |
166 | { | |
167 | void *area; | |
168 | struct cmg_entry *entry, reference_buf; | |
169 | int idx; | |
170 | ||
171 | if (chpid.id < 128) { | |
172 | area = css->cub_addr1; | |
173 | idx = chpid.id; | |
174 | } else { | |
175 | area = css->cub_addr2; | |
176 | idx = chpid.id - 128; | |
177 | } | |
178 | entry = area + (idx * sizeof(struct cmg_entry)); | |
179 | do { | |
180 | memcpy(buf, entry, sizeof(*entry)); | |
181 | memcpy(&reference_buf, entry, sizeof(*entry)); | |
182 | } while (reference_buf.values[0] != buf->values[0]); | |
183 | } | |
184 | ||
91a69029 ZR |
185 | static ssize_t chp_measurement_read(struct kobject *kobj, |
186 | struct bin_attribute *bin_attr, | |
187 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
188 | { |
189 | struct channel_path *chp; | |
190 | struct channel_subsystem *css; | |
364c8558 | 191 | struct device *device; |
e6b6e10a PO |
192 | unsigned int size; |
193 | ||
364c8558 HC |
194 | device = container_of(kobj, struct device, kobj); |
195 | chp = to_channelpath(device); | |
e6b6e10a PO |
196 | css = to_css(chp->dev.parent); |
197 | ||
198 | size = sizeof(struct cmg_entry); | |
199 | ||
200 | /* Only allow single reads. */ | |
201 | if (off || count < size) | |
202 | return 0; | |
203 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); | |
204 | count = size; | |
205 | return count; | |
206 | } | |
207 | ||
208 | static struct bin_attribute chp_measurement_attr = { | |
209 | .attr = { | |
210 | .name = "measurement", | |
211 | .mode = S_IRUSR, | |
e6b6e10a PO |
212 | }, |
213 | .size = sizeof(struct cmg_entry), | |
214 | .read = chp_measurement_read, | |
215 | }; | |
216 | ||
217 | void chp_remove_cmg_attr(struct channel_path *chp) | |
218 | { | |
219 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
220 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); | |
221 | } | |
222 | ||
223 | int chp_add_cmg_attr(struct channel_path *chp) | |
224 | { | |
225 | int ret; | |
226 | ||
227 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
228 | if (ret) | |
229 | return ret; | |
230 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); | |
231 | if (ret) | |
232 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
233 | return ret; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Files for the channel path entries. | |
238 | */ | |
239 | static ssize_t chp_status_show(struct device *dev, | |
240 | struct device_attribute *attr, char *buf) | |
241 | { | |
05469607 | 242 | struct channel_path *chp = to_channelpath(dev); |
e6b6e10a PO |
243 | |
244 | if (!chp) | |
245 | return 0; | |
246 | return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") : | |
247 | sprintf(buf, "offline\n")); | |
248 | } | |
249 | ||
250 | static ssize_t chp_status_write(struct device *dev, | |
251 | struct device_attribute *attr, | |
252 | const char *buf, size_t count) | |
253 | { | |
05469607 | 254 | struct channel_path *cp = to_channelpath(dev); |
e6b6e10a PO |
255 | char cmd[10]; |
256 | int num_args; | |
257 | int error; | |
258 | ||
259 | num_args = sscanf(buf, "%5s", cmd); | |
260 | if (!num_args) | |
261 | return count; | |
262 | ||
263 | if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) | |
264 | error = s390_vary_chpid(cp->chpid, 1); | |
265 | else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) | |
266 | error = s390_vary_chpid(cp->chpid, 0); | |
267 | else | |
268 | error = -EINVAL; | |
269 | ||
270 | return error < 0 ? error : count; | |
271 | ||
272 | } | |
273 | ||
274 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); | |
275 | ||
e5854a58 PO |
276 | static ssize_t chp_configure_show(struct device *dev, |
277 | struct device_attribute *attr, char *buf) | |
278 | { | |
279 | struct channel_path *cp; | |
280 | int status; | |
281 | ||
05469607 | 282 | cp = to_channelpath(dev); |
e5854a58 PO |
283 | status = chp_info_get_status(cp->chpid); |
284 | if (status < 0) | |
285 | return status; | |
286 | ||
287 | return snprintf(buf, PAGE_SIZE, "%d\n", status); | |
288 | } | |
289 | ||
290 | static int cfg_wait_idle(void); | |
291 | ||
292 | static ssize_t chp_configure_write(struct device *dev, | |
293 | struct device_attribute *attr, | |
294 | const char *buf, size_t count) | |
295 | { | |
296 | struct channel_path *cp; | |
297 | int val; | |
298 | char delim; | |
299 | ||
300 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
301 | return -EINVAL; | |
302 | if (val != 0 && val != 1) | |
303 | return -EINVAL; | |
05469607 | 304 | cp = to_channelpath(dev); |
e5854a58 PO |
305 | chp_cfg_schedule(cp->chpid, val); |
306 | cfg_wait_idle(); | |
307 | ||
308 | return count; | |
309 | } | |
310 | ||
311 | static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); | |
312 | ||
e6b6e10a PO |
313 | static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
314 | char *buf) | |
315 | { | |
05469607 | 316 | struct channel_path *chp = to_channelpath(dev); |
e6b6e10a PO |
317 | |
318 | if (!chp) | |
319 | return 0; | |
320 | return sprintf(buf, "%x\n", chp->desc.desc); | |
321 | } | |
322 | ||
323 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); | |
324 | ||
325 | static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, | |
326 | char *buf) | |
327 | { | |
328 | struct channel_path *chp = to_channelpath(dev); | |
329 | ||
330 | if (!chp) | |
331 | return 0; | |
332 | if (chp->cmg == -1) /* channel measurements not available */ | |
333 | return sprintf(buf, "unknown\n"); | |
334 | return sprintf(buf, "%x\n", chp->cmg); | |
335 | } | |
336 | ||
337 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); | |
338 | ||
339 | static ssize_t chp_shared_show(struct device *dev, | |
340 | struct device_attribute *attr, char *buf) | |
341 | { | |
342 | struct channel_path *chp = to_channelpath(dev); | |
343 | ||
344 | if (!chp) | |
345 | return 0; | |
346 | if (chp->shared == -1) /* channel measurements not available */ | |
347 | return sprintf(buf, "unknown\n"); | |
348 | return sprintf(buf, "%x\n", chp->shared); | |
349 | } | |
350 | ||
351 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); | |
352 | ||
a0ea22c3 | 353 | static struct attribute *chp_attrs[] = { |
e6b6e10a | 354 | &dev_attr_status.attr, |
e5854a58 | 355 | &dev_attr_configure.attr, |
e6b6e10a PO |
356 | &dev_attr_type.attr, |
357 | &dev_attr_cmg.attr, | |
358 | &dev_attr_shared.attr, | |
359 | NULL, | |
360 | }; | |
361 | ||
362 | static struct attribute_group chp_attr_group = { | |
363 | .attrs = chp_attrs, | |
364 | }; | |
365 | ||
366 | static void chp_release(struct device *dev) | |
367 | { | |
368 | struct channel_path *cp; | |
369 | ||
05469607 | 370 | cp = to_channelpath(dev); |
e6b6e10a PO |
371 | kfree(cp); |
372 | } | |
373 | ||
374 | /** | |
375 | * chp_new - register a new channel-path | |
376 | * @chpid - channel-path ID | |
377 | * | |
378 | * Create and register data structure representing new channel-path. Return | |
379 | * zero on success, non-zero otherwise. | |
380 | */ | |
381 | int chp_new(struct chp_id chpid) | |
382 | { | |
383 | struct channel_path *chp; | |
384 | int ret; | |
385 | ||
e5854a58 PO |
386 | if (chp_is_registered(chpid)) |
387 | return 0; | |
e6b6e10a PO |
388 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
389 | if (!chp) | |
390 | return -ENOMEM; | |
391 | ||
392 | /* fill in status, etc. */ | |
393 | chp->chpid = chpid; | |
394 | chp->state = 1; | |
7c9f4e3a | 395 | chp->dev.parent = &channel_subsystems[chpid.cssid]->device; |
e6b6e10a | 396 | chp->dev.release = chp_release; |
e6b6e10a PO |
397 | |
398 | /* Obtain channel path description and fill it in. */ | |
9d92a7e1 | 399 | ret = chsc_determine_base_channel_path_desc(chpid, &chp->desc); |
e6b6e10a PO |
400 | if (ret) |
401 | goto out_free; | |
c9182e0f PO |
402 | if ((chp->desc.flags & 0x80) == 0) { |
403 | ret = -ENODEV; | |
404 | goto out_free; | |
405 | } | |
e6b6e10a | 406 | /* Get channel-measurement characteristics. */ |
75784c00 | 407 | if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) { |
e6b6e10a PO |
408 | ret = chsc_get_channel_measurement_chars(chp); |
409 | if (ret) | |
410 | goto out_free; | |
411 | } else { | |
e6b6e10a PO |
412 | chp->cmg = -1; |
413 | } | |
ec004407 | 414 | dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); |
e6b6e10a PO |
415 | |
416 | /* make it known to the system */ | |
417 | ret = device_register(&chp->dev); | |
418 | if (ret) { | |
e556bbbd CH |
419 | CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
420 | chpid.cssid, chpid.id, ret); | |
c6304933 SO |
421 | put_device(&chp->dev); |
422 | goto out; | |
e6b6e10a PO |
423 | } |
424 | ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group); | |
425 | if (ret) { | |
426 | device_unregister(&chp->dev); | |
a2164b81 | 427 | goto out; |
e6b6e10a | 428 | } |
7c9f4e3a CH |
429 | mutex_lock(&channel_subsystems[chpid.cssid]->mutex); |
430 | if (channel_subsystems[chpid.cssid]->cm_enabled) { | |
e6b6e10a PO |
431 | ret = chp_add_cmg_attr(chp); |
432 | if (ret) { | |
433 | sysfs_remove_group(&chp->dev.kobj, &chp_attr_group); | |
434 | device_unregister(&chp->dev); | |
7c9f4e3a | 435 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); |
a2164b81 | 436 | goto out; |
e6b6e10a PO |
437 | } |
438 | } | |
7c9f4e3a CH |
439 | channel_subsystems[chpid.cssid]->chps[chpid.id] = chp; |
440 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); | |
a2164b81 | 441 | goto out; |
e6b6e10a PO |
442 | out_free: |
443 | kfree(chp); | |
a2164b81 | 444 | out: |
e6b6e10a PO |
445 | return ret; |
446 | } | |
447 | ||
448 | /** | |
449 | * chp_get_chp_desc - return newly allocated channel-path description | |
450 | * @chpid: channel-path ID | |
451 | * | |
452 | * On success return a newly allocated copy of the channel-path description | |
453 | * data associated with the given channel-path ID. Return %NULL on error. | |
454 | */ | |
455 | void *chp_get_chp_desc(struct chp_id chpid) | |
456 | { | |
457 | struct channel_path *chp; | |
458 | struct channel_path_desc *desc; | |
459 | ||
460 | chp = chpid_to_chp(chpid); | |
461 | if (!chp) | |
462 | return NULL; | |
463 | desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); | |
464 | if (!desc) | |
465 | return NULL; | |
466 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); | |
467 | return desc; | |
468 | } | |
469 | ||
470 | /** | |
471 | * chp_process_crw - process channel-path status change | |
c1156189 CH |
472 | * @crw0: channel report-word to handler |
473 | * @crw1: second channel-report word (always NULL) | |
474 | * @overflow: crw overflow indication | |
e6b6e10a PO |
475 | * |
476 | * Handle channel-report-words indicating that the status of a channel-path | |
477 | * has changed. | |
478 | */ | |
c1156189 CH |
479 | static void chp_process_crw(struct crw *crw0, struct crw *crw1, |
480 | int overflow) | |
e6b6e10a PO |
481 | { |
482 | struct chp_id chpid; | |
483 | ||
c1156189 CH |
484 | if (overflow) { |
485 | css_schedule_eval_all(); | |
486 | return; | |
487 | } | |
488 | CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " | |
489 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
490 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
491 | crw0->erc, crw0->rsid); | |
492 | /* | |
493 | * Check for solicited machine checks. These are | |
494 | * created by reset channel path and need not be | |
495 | * handled here. | |
496 | */ | |
497 | if (crw0->slct) { | |
498 | CIO_CRW_EVENT(2, "solicited machine check for " | |
499 | "channel path %02X\n", crw0->rsid); | |
500 | return; | |
501 | } | |
e6b6e10a | 502 | chp_id_init(&chpid); |
c1156189 CH |
503 | chpid.id = crw0->rsid; |
504 | switch (crw0->erc) { | |
505 | case CRW_ERC_IPARM: /* Path has come. */ | |
e6b6e10a PO |
506 | if (!chp_is_registered(chpid)) |
507 | chp_new(chpid); | |
83b3370c | 508 | chsc_chp_online(chpid); |
c1156189 CH |
509 | break; |
510 | case CRW_ERC_PERRI: /* Path has gone. */ | |
511 | case CRW_ERC_PERRN: | |
e6b6e10a | 512 | chsc_chp_offline(chpid); |
c1156189 CH |
513 | break; |
514 | default: | |
515 | CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", | |
516 | crw0->erc); | |
517 | } | |
e6b6e10a | 518 | } |
e5854a58 | 519 | |
99611f87 | 520 | int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) |
c820de39 CH |
521 | { |
522 | int i; | |
523 | int mask; | |
524 | ||
525 | for (i = 0; i < 8; i++) { | |
526 | mask = 0x80 >> i; | |
527 | if (!(ssd->path_mask & mask)) | |
528 | continue; | |
99611f87 | 529 | if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) |
c820de39 CH |
530 | continue; |
531 | if ((ssd->fla_valid_mask & mask) && | |
99611f87 | 532 | ((ssd->fla[i] & link->fla_mask) != link->fla)) |
c820de39 CH |
533 | continue; |
534 | return mask; | |
535 | } | |
536 | return 0; | |
537 | } | |
538 | EXPORT_SYMBOL_GPL(chp_ssd_get_mask); | |
539 | ||
e5854a58 PO |
540 | static inline int info_bit_num(struct chp_id id) |
541 | { | |
542 | return id.id + id.cssid * (__MAX_CHPID + 1); | |
543 | } | |
544 | ||
545 | /* Force chp_info refresh on next call to info_validate(). */ | |
546 | static void info_expire(void) | |
547 | { | |
548 | mutex_lock(&info_lock); | |
549 | chp_info_expires = jiffies - 1; | |
550 | mutex_unlock(&info_lock); | |
551 | } | |
552 | ||
553 | /* Ensure that chp_info is up-to-date. */ | |
554 | static int info_update(void) | |
555 | { | |
556 | int rc; | |
557 | ||
558 | mutex_lock(&info_lock); | |
559 | rc = 0; | |
560 | if (time_after(jiffies, chp_info_expires)) { | |
561 | /* Data is too old, update. */ | |
562 | rc = sclp_chp_read_info(&chp_info); | |
563 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; | |
564 | } | |
565 | mutex_unlock(&info_lock); | |
566 | ||
567 | return rc; | |
568 | } | |
569 | ||
570 | /** | |
571 | * chp_info_get_status - retrieve configure status of a channel-path | |
572 | * @chpid: channel-path ID | |
573 | * | |
574 | * On success, return 0 for standby, 1 for configured, 2 for reserved, | |
575 | * 3 for not recognized. Return negative error code on error. | |
576 | */ | |
577 | int chp_info_get_status(struct chp_id chpid) | |
578 | { | |
579 | int rc; | |
580 | int bit; | |
581 | ||
582 | rc = info_update(); | |
583 | if (rc) | |
584 | return rc; | |
585 | ||
586 | bit = info_bit_num(chpid); | |
587 | mutex_lock(&info_lock); | |
588 | if (!chp_test_bit(chp_info.recognized, bit)) | |
589 | rc = CHP_STATUS_NOT_RECOGNIZED; | |
590 | else if (chp_test_bit(chp_info.configured, bit)) | |
591 | rc = CHP_STATUS_CONFIGURED; | |
592 | else if (chp_test_bit(chp_info.standby, bit)) | |
593 | rc = CHP_STATUS_STANDBY; | |
594 | else | |
595 | rc = CHP_STATUS_RESERVED; | |
596 | mutex_unlock(&info_lock); | |
597 | ||
598 | return rc; | |
599 | } | |
600 | ||
601 | /* Return configure task for chpid. */ | |
602 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) | |
603 | { | |
604 | return chp_cfg_task[chpid.cssid][chpid.id]; | |
605 | } | |
606 | ||
607 | /* Set configure task for chpid. */ | |
608 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) | |
609 | { | |
610 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; | |
611 | } | |
612 | ||
613 | /* Perform one configure/deconfigure request. Reschedule work function until | |
614 | * last request. */ | |
615 | static void cfg_func(struct work_struct *work) | |
616 | { | |
617 | struct chp_id chpid; | |
618 | enum cfg_task_t t; | |
683c5418 | 619 | int rc; |
e5854a58 PO |
620 | |
621 | mutex_lock(&cfg_lock); | |
622 | t = cfg_none; | |
623 | chp_id_for_each(&chpid) { | |
624 | t = cfg_get_task(chpid); | |
625 | if (t != cfg_none) { | |
626 | cfg_set_task(chpid, cfg_none); | |
627 | break; | |
628 | } | |
629 | } | |
630 | mutex_unlock(&cfg_lock); | |
631 | ||
632 | switch (t) { | |
633 | case cfg_configure: | |
683c5418 PO |
634 | rc = sclp_chp_configure(chpid); |
635 | if (rc) | |
636 | CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" | |
637 | "%d\n", chpid.cssid, chpid.id, rc); | |
638 | else { | |
639 | info_expire(); | |
640 | chsc_chp_online(chpid); | |
641 | } | |
e5854a58 PO |
642 | break; |
643 | case cfg_deconfigure: | |
683c5418 PO |
644 | rc = sclp_chp_deconfigure(chpid); |
645 | if (rc) | |
646 | CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" | |
647 | "%d\n", chpid.cssid, chpid.id, rc); | |
648 | else { | |
649 | info_expire(); | |
650 | chsc_chp_offline(chpid); | |
651 | } | |
e5854a58 PO |
652 | break; |
653 | case cfg_none: | |
654 | /* Get updated information after last change. */ | |
655 | info_update(); | |
656 | mutex_lock(&cfg_lock); | |
657 | cfg_busy = 0; | |
658 | mutex_unlock(&cfg_lock); | |
659 | wake_up_interruptible(&cfg_wait_queue); | |
660 | return; | |
661 | } | |
662 | queue_work(chp_wq, &cfg_work); | |
663 | } | |
664 | ||
665 | /** | |
666 | * chp_cfg_schedule - schedule chpid configuration request | |
667 | * @chpid - channel-path ID | |
668 | * @configure - Non-zero for configure, zero for deconfigure | |
669 | * | |
670 | * Schedule a channel-path configuration/deconfiguration request. | |
671 | */ | |
672 | void chp_cfg_schedule(struct chp_id chpid, int configure) | |
673 | { | |
674 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, | |
675 | configure); | |
676 | mutex_lock(&cfg_lock); | |
677 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); | |
678 | cfg_busy = 1; | |
679 | mutex_unlock(&cfg_lock); | |
680 | queue_work(chp_wq, &cfg_work); | |
681 | } | |
682 | ||
683 | /** | |
684 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request | |
685 | * @chpid - channel-path ID | |
686 | * | |
687 | * Cancel an active channel-path deconfiguration request if it has not yet | |
688 | * been performed. | |
689 | */ | |
690 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) | |
691 | { | |
692 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); | |
693 | mutex_lock(&cfg_lock); | |
694 | if (cfg_get_task(chpid) == cfg_deconfigure) | |
695 | cfg_set_task(chpid, cfg_none); | |
696 | mutex_unlock(&cfg_lock); | |
697 | } | |
698 | ||
699 | static int cfg_wait_idle(void) | |
700 | { | |
701 | if (wait_event_interruptible(cfg_wait_queue, !cfg_busy)) | |
702 | return -ERESTARTSYS; | |
703 | return 0; | |
704 | } | |
705 | ||
706 | static int __init chp_init(void) | |
707 | { | |
708 | struct chp_id chpid; | |
c1156189 | 709 | int ret; |
e5854a58 | 710 | |
f5daba1d | 711 | ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); |
c1156189 CH |
712 | if (ret) |
713 | return ret; | |
e5854a58 | 714 | chp_wq = create_singlethread_workqueue("cio_chp"); |
c1156189 | 715 | if (!chp_wq) { |
f5daba1d | 716 | crw_unregister_handler(CRW_RSC_CPATH); |
e5854a58 | 717 | return -ENOMEM; |
c1156189 | 718 | } |
e5854a58 PO |
719 | INIT_WORK(&cfg_work, cfg_func); |
720 | init_waitqueue_head(&cfg_wait_queue); | |
721 | if (info_update()) | |
722 | return 0; | |
723 | /* Register available channel-paths. */ | |
724 | chp_id_for_each(&chpid) { | |
725 | if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED) | |
726 | chp_new(chpid); | |
727 | } | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
732 | subsys_initcall(chp_init); |