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 | |
c1156189 | 21 | #include "../s390mach.h" |
e6b6e10a PO |
22 | #include "cio.h" |
23 | #include "css.h" | |
24 | #include "ioasm.h" | |
25 | #include "cio_debug.h" | |
26 | #include "chp.h" | |
27 | ||
28 | #define to_channelpath(device) container_of(device, struct channel_path, dev) | |
e5854a58 PO |
29 | #define CHP_INFO_UPDATE_INTERVAL 1*HZ |
30 | ||
31 | enum cfg_task_t { | |
32 | cfg_none, | |
33 | cfg_configure, | |
34 | cfg_deconfigure | |
35 | }; | |
36 | ||
37 | /* Map for pending configure tasks. */ | |
38 | static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1]; | |
39 | static DEFINE_MUTEX(cfg_lock); | |
40 | static int cfg_busy; | |
41 | ||
42 | /* Map for channel-path status. */ | |
43 | static struct sclp_chp_info chp_info; | |
44 | static DEFINE_MUTEX(info_lock); | |
45 | ||
46 | /* Time after which channel-path status may be outdated. */ | |
47 | static unsigned long chp_info_expires; | |
48 | ||
49 | /* Workqueue to perform pending configure tasks. */ | |
50 | static struct workqueue_struct *chp_wq; | |
51 | static struct work_struct cfg_work; | |
52 | ||
53 | /* Wait queue for configure completion events. */ | |
54 | static wait_queue_head_t cfg_wait_queue; | |
e6b6e10a PO |
55 | |
56 | /* Return channel_path struct for given chpid. */ | |
57 | static inline struct channel_path *chpid_to_chp(struct chp_id chpid) | |
58 | { | |
7c9f4e3a | 59 | return channel_subsystems[chpid.cssid]->chps[chpid.id]; |
e6b6e10a PO |
60 | } |
61 | ||
62 | /* Set vary state for given chpid. */ | |
63 | static void set_chp_logically_online(struct chp_id chpid, int onoff) | |
64 | { | |
65 | chpid_to_chp(chpid)->state = onoff; | |
66 | } | |
67 | ||
68 | /* On succes return 0 if channel-path is varied offline, 1 if it is varied | |
69 | * online. Return -ENODEV if channel-path is not registered. */ | |
70 | int chp_get_status(struct chp_id chpid) | |
71 | { | |
72 | return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); | |
73 | } | |
74 | ||
75 | /** | |
76 | * chp_get_sch_opm - return opm for subchannel | |
77 | * @sch: subchannel | |
78 | * | |
79 | * Calculate and return the operational path mask (opm) based on the chpids | |
80 | * used by the subchannel and the status of the associated channel-paths. | |
81 | */ | |
82 | u8 chp_get_sch_opm(struct subchannel *sch) | |
83 | { | |
84 | struct chp_id chpid; | |
85 | int opm; | |
86 | int i; | |
87 | ||
88 | opm = 0; | |
89 | chp_id_init(&chpid); | |
a0ea22c3 | 90 | for (i = 0; i < 8; i++) { |
e6b6e10a PO |
91 | opm <<= 1; |
92 | chpid.id = sch->schib.pmcw.chpid[i]; | |
93 | if (chp_get_status(chpid) != 0) | |
94 | opm |= 1; | |
95 | } | |
96 | return opm; | |
97 | } | |
98 | ||
99 | /** | |
100 | * chp_is_registered - check if a channel-path is registered | |
101 | * @chpid: channel-path ID | |
102 | * | |
103 | * Return non-zero if a channel-path with the given chpid is registered, | |
104 | * zero otherwise. | |
105 | */ | |
106 | int chp_is_registered(struct chp_id chpid) | |
107 | { | |
108 | return chpid_to_chp(chpid) != NULL; | |
109 | } | |
110 | ||
111 | /* | |
112 | * Function: s390_vary_chpid | |
113 | * Varies the specified chpid online or offline | |
114 | */ | |
115 | static int s390_vary_chpid(struct chp_id chpid, int on) | |
116 | { | |
117 | char dbf_text[15]; | |
118 | int status; | |
119 | ||
120 | sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, | |
121 | chpid.id); | |
a0ea22c3 | 122 | CIO_TRACE_EVENT(2, dbf_text); |
e6b6e10a PO |
123 | |
124 | status = chp_get_status(chpid); | |
e6b6e10a | 125 | if (!on && !status) { |
e556bbbd | 126 | printk(KERN_ERR "cio: chpid %x.%02x is already offline\n", |
e6b6e10a PO |
127 | chpid.cssid, chpid.id); |
128 | return -EINVAL; | |
129 | } | |
130 | ||
131 | set_chp_logically_online(chpid, on); | |
132 | chsc_chp_vary(chpid, on); | |
133 | return 0; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Channel measurement related functions | |
138 | */ | |
91a69029 ZR |
139 | static ssize_t chp_measurement_chars_read(struct kobject *kobj, |
140 | struct bin_attribute *bin_attr, | |
141 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
142 | { |
143 | struct channel_path *chp; | |
364c8558 | 144 | struct device *device; |
e6b6e10a PO |
145 | unsigned int size; |
146 | ||
364c8558 HC |
147 | device = container_of(kobj, struct device, kobj); |
148 | chp = to_channelpath(device); | |
e6b6e10a PO |
149 | if (!chp->cmg_chars) |
150 | return 0; | |
151 | ||
152 | size = sizeof(struct cmg_chars); | |
153 | ||
154 | if (off > size) | |
155 | return 0; | |
156 | if (off + count > size) | |
157 | count = size - off; | |
158 | memcpy(buf, chp->cmg_chars + off, count); | |
159 | return count; | |
160 | } | |
161 | ||
162 | static struct bin_attribute chp_measurement_chars_attr = { | |
163 | .attr = { | |
164 | .name = "measurement_chars", | |
165 | .mode = S_IRUSR, | |
e6b6e10a PO |
166 | }, |
167 | .size = sizeof(struct cmg_chars), | |
168 | .read = chp_measurement_chars_read, | |
169 | }; | |
170 | ||
171 | static void chp_measurement_copy_block(struct cmg_entry *buf, | |
172 | struct channel_subsystem *css, | |
173 | struct chp_id chpid) | |
174 | { | |
175 | void *area; | |
176 | struct cmg_entry *entry, reference_buf; | |
177 | int idx; | |
178 | ||
179 | if (chpid.id < 128) { | |
180 | area = css->cub_addr1; | |
181 | idx = chpid.id; | |
182 | } else { | |
183 | area = css->cub_addr2; | |
184 | idx = chpid.id - 128; | |
185 | } | |
186 | entry = area + (idx * sizeof(struct cmg_entry)); | |
187 | do { | |
188 | memcpy(buf, entry, sizeof(*entry)); | |
189 | memcpy(&reference_buf, entry, sizeof(*entry)); | |
190 | } while (reference_buf.values[0] != buf->values[0]); | |
191 | } | |
192 | ||
91a69029 ZR |
193 | static ssize_t chp_measurement_read(struct kobject *kobj, |
194 | struct bin_attribute *bin_attr, | |
195 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
196 | { |
197 | struct channel_path *chp; | |
198 | struct channel_subsystem *css; | |
364c8558 | 199 | struct device *device; |
e6b6e10a PO |
200 | unsigned int size; |
201 | ||
364c8558 HC |
202 | device = container_of(kobj, struct device, kobj); |
203 | chp = to_channelpath(device); | |
e6b6e10a PO |
204 | css = to_css(chp->dev.parent); |
205 | ||
206 | size = sizeof(struct cmg_entry); | |
207 | ||
208 | /* Only allow single reads. */ | |
209 | if (off || count < size) | |
210 | return 0; | |
211 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); | |
212 | count = size; | |
213 | return count; | |
214 | } | |
215 | ||
216 | static struct bin_attribute chp_measurement_attr = { | |
217 | .attr = { | |
218 | .name = "measurement", | |
219 | .mode = S_IRUSR, | |
e6b6e10a PO |
220 | }, |
221 | .size = sizeof(struct cmg_entry), | |
222 | .read = chp_measurement_read, | |
223 | }; | |
224 | ||
225 | void chp_remove_cmg_attr(struct channel_path *chp) | |
226 | { | |
227 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
228 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); | |
229 | } | |
230 | ||
231 | int chp_add_cmg_attr(struct channel_path *chp) | |
232 | { | |
233 | int ret; | |
234 | ||
235 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
236 | if (ret) | |
237 | return ret; | |
238 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); | |
239 | if (ret) | |
240 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
241 | return ret; | |
242 | } | |
243 | ||
244 | /* | |
245 | * Files for the channel path entries. | |
246 | */ | |
247 | static ssize_t chp_status_show(struct device *dev, | |
248 | struct device_attribute *attr, char *buf) | |
249 | { | |
05469607 | 250 | struct channel_path *chp = to_channelpath(dev); |
e6b6e10a PO |
251 | |
252 | if (!chp) | |
253 | return 0; | |
254 | return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") : | |
255 | sprintf(buf, "offline\n")); | |
256 | } | |
257 | ||
258 | static ssize_t chp_status_write(struct device *dev, | |
259 | struct device_attribute *attr, | |
260 | const char *buf, size_t count) | |
261 | { | |
05469607 | 262 | struct channel_path *cp = to_channelpath(dev); |
e6b6e10a PO |
263 | char cmd[10]; |
264 | int num_args; | |
265 | int error; | |
266 | ||
267 | num_args = sscanf(buf, "%5s", cmd); | |
268 | if (!num_args) | |
269 | return count; | |
270 | ||
271 | if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) | |
272 | error = s390_vary_chpid(cp->chpid, 1); | |
273 | else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) | |
274 | error = s390_vary_chpid(cp->chpid, 0); | |
275 | else | |
276 | error = -EINVAL; | |
277 | ||
278 | return error < 0 ? error : count; | |
279 | ||
280 | } | |
281 | ||
282 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); | |
283 | ||
e5854a58 PO |
284 | static ssize_t chp_configure_show(struct device *dev, |
285 | struct device_attribute *attr, char *buf) | |
286 | { | |
287 | struct channel_path *cp; | |
288 | int status; | |
289 | ||
05469607 | 290 | cp = to_channelpath(dev); |
e5854a58 PO |
291 | status = chp_info_get_status(cp->chpid); |
292 | if (status < 0) | |
293 | return status; | |
294 | ||
295 | return snprintf(buf, PAGE_SIZE, "%d\n", status); | |
296 | } | |
297 | ||
298 | static int cfg_wait_idle(void); | |
299 | ||
300 | static ssize_t chp_configure_write(struct device *dev, | |
301 | struct device_attribute *attr, | |
302 | const char *buf, size_t count) | |
303 | { | |
304 | struct channel_path *cp; | |
305 | int val; | |
306 | char delim; | |
307 | ||
308 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
309 | return -EINVAL; | |
310 | if (val != 0 && val != 1) | |
311 | return -EINVAL; | |
05469607 | 312 | cp = to_channelpath(dev); |
e5854a58 PO |
313 | chp_cfg_schedule(cp->chpid, val); |
314 | cfg_wait_idle(); | |
315 | ||
316 | return count; | |
317 | } | |
318 | ||
319 | static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); | |
320 | ||
e6b6e10a PO |
321 | static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
322 | char *buf) | |
323 | { | |
05469607 | 324 | struct channel_path *chp = to_channelpath(dev); |
e6b6e10a PO |
325 | |
326 | if (!chp) | |
327 | return 0; | |
328 | return sprintf(buf, "%x\n", chp->desc.desc); | |
329 | } | |
330 | ||
331 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); | |
332 | ||
333 | static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, | |
334 | char *buf) | |
335 | { | |
336 | struct channel_path *chp = to_channelpath(dev); | |
337 | ||
338 | if (!chp) | |
339 | return 0; | |
340 | if (chp->cmg == -1) /* channel measurements not available */ | |
341 | return sprintf(buf, "unknown\n"); | |
342 | return sprintf(buf, "%x\n", chp->cmg); | |
343 | } | |
344 | ||
345 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); | |
346 | ||
347 | static ssize_t chp_shared_show(struct device *dev, | |
348 | struct device_attribute *attr, char *buf) | |
349 | { | |
350 | struct channel_path *chp = to_channelpath(dev); | |
351 | ||
352 | if (!chp) | |
353 | return 0; | |
354 | if (chp->shared == -1) /* channel measurements not available */ | |
355 | return sprintf(buf, "unknown\n"); | |
356 | return sprintf(buf, "%x\n", chp->shared); | |
357 | } | |
358 | ||
359 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); | |
360 | ||
a0ea22c3 | 361 | static struct attribute *chp_attrs[] = { |
e6b6e10a | 362 | &dev_attr_status.attr, |
e5854a58 | 363 | &dev_attr_configure.attr, |
e6b6e10a PO |
364 | &dev_attr_type.attr, |
365 | &dev_attr_cmg.attr, | |
366 | &dev_attr_shared.attr, | |
367 | NULL, | |
368 | }; | |
369 | ||
370 | static struct attribute_group chp_attr_group = { | |
371 | .attrs = chp_attrs, | |
372 | }; | |
373 | ||
374 | static void chp_release(struct device *dev) | |
375 | { | |
376 | struct channel_path *cp; | |
377 | ||
05469607 | 378 | cp = to_channelpath(dev); |
e6b6e10a PO |
379 | kfree(cp); |
380 | } | |
381 | ||
382 | /** | |
383 | * chp_new - register a new channel-path | |
384 | * @chpid - channel-path ID | |
385 | * | |
386 | * Create and register data structure representing new channel-path. Return | |
387 | * zero on success, non-zero otherwise. | |
388 | */ | |
389 | int chp_new(struct chp_id chpid) | |
390 | { | |
391 | struct channel_path *chp; | |
392 | int ret; | |
393 | ||
e5854a58 PO |
394 | if (chp_is_registered(chpid)) |
395 | return 0; | |
e6b6e10a PO |
396 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
397 | if (!chp) | |
398 | return -ENOMEM; | |
399 | ||
400 | /* fill in status, etc. */ | |
401 | chp->chpid = chpid; | |
402 | chp->state = 1; | |
7c9f4e3a | 403 | chp->dev.parent = &channel_subsystems[chpid.cssid]->device; |
e6b6e10a PO |
404 | chp->dev.release = chp_release; |
405 | snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid, | |
406 | chpid.id); | |
407 | ||
408 | /* Obtain channel path description and fill it in. */ | |
409 | ret = chsc_determine_channel_path_description(chpid, &chp->desc); | |
410 | if (ret) | |
411 | goto out_free; | |
c9182e0f PO |
412 | if ((chp->desc.flags & 0x80) == 0) { |
413 | ret = -ENODEV; | |
414 | goto out_free; | |
415 | } | |
e6b6e10a PO |
416 | /* Get channel-measurement characteristics. */ |
417 | if (css_characteristics_avail && css_chsc_characteristics.scmc | |
418 | && css_chsc_characteristics.secm) { | |
419 | ret = chsc_get_channel_measurement_chars(chp); | |
420 | if (ret) | |
421 | goto out_free; | |
422 | } else { | |
e6b6e10a PO |
423 | chp->cmg = -1; |
424 | } | |
425 | ||
426 | /* make it known to the system */ | |
427 | ret = device_register(&chp->dev); | |
428 | if (ret) { | |
e556bbbd CH |
429 | CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
430 | chpid.cssid, chpid.id, ret); | |
e6b6e10a PO |
431 | goto out_free; |
432 | } | |
433 | ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group); | |
434 | if (ret) { | |
435 | device_unregister(&chp->dev); | |
436 | goto out_free; | |
437 | } | |
7c9f4e3a CH |
438 | mutex_lock(&channel_subsystems[chpid.cssid]->mutex); |
439 | if (channel_subsystems[chpid.cssid]->cm_enabled) { | |
e6b6e10a PO |
440 | ret = chp_add_cmg_attr(chp); |
441 | if (ret) { | |
442 | sysfs_remove_group(&chp->dev.kobj, &chp_attr_group); | |
443 | device_unregister(&chp->dev); | |
7c9f4e3a | 444 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); |
e6b6e10a PO |
445 | goto out_free; |
446 | } | |
447 | } | |
7c9f4e3a CH |
448 | channel_subsystems[chpid.cssid]->chps[chpid.id] = chp; |
449 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); | |
e6b6e10a PO |
450 | return ret; |
451 | out_free: | |
452 | kfree(chp); | |
453 | return ret; | |
454 | } | |
455 | ||
456 | /** | |
457 | * chp_get_chp_desc - return newly allocated channel-path description | |
458 | * @chpid: channel-path ID | |
459 | * | |
460 | * On success return a newly allocated copy of the channel-path description | |
461 | * data associated with the given channel-path ID. Return %NULL on error. | |
462 | */ | |
463 | void *chp_get_chp_desc(struct chp_id chpid) | |
464 | { | |
465 | struct channel_path *chp; | |
466 | struct channel_path_desc *desc; | |
467 | ||
468 | chp = chpid_to_chp(chpid); | |
469 | if (!chp) | |
470 | return NULL; | |
471 | desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); | |
472 | if (!desc) | |
473 | return NULL; | |
474 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); | |
475 | return desc; | |
476 | } | |
477 | ||
478 | /** | |
479 | * chp_process_crw - process channel-path status change | |
c1156189 CH |
480 | * @crw0: channel report-word to handler |
481 | * @crw1: second channel-report word (always NULL) | |
482 | * @overflow: crw overflow indication | |
e6b6e10a PO |
483 | * |
484 | * Handle channel-report-words indicating that the status of a channel-path | |
485 | * has changed. | |
486 | */ | |
c1156189 CH |
487 | static void chp_process_crw(struct crw *crw0, struct crw *crw1, |
488 | int overflow) | |
e6b6e10a PO |
489 | { |
490 | struct chp_id chpid; | |
491 | ||
c1156189 CH |
492 | if (overflow) { |
493 | css_schedule_eval_all(); | |
494 | return; | |
495 | } | |
496 | CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " | |
497 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
498 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
499 | crw0->erc, crw0->rsid); | |
500 | /* | |
501 | * Check for solicited machine checks. These are | |
502 | * created by reset channel path and need not be | |
503 | * handled here. | |
504 | */ | |
505 | if (crw0->slct) { | |
506 | CIO_CRW_EVENT(2, "solicited machine check for " | |
507 | "channel path %02X\n", crw0->rsid); | |
508 | return; | |
509 | } | |
e6b6e10a | 510 | chp_id_init(&chpid); |
c1156189 CH |
511 | chpid.id = crw0->rsid; |
512 | switch (crw0->erc) { | |
513 | case CRW_ERC_IPARM: /* Path has come. */ | |
e6b6e10a PO |
514 | if (!chp_is_registered(chpid)) |
515 | chp_new(chpid); | |
83b3370c | 516 | chsc_chp_online(chpid); |
c1156189 CH |
517 | break; |
518 | case CRW_ERC_PERRI: /* Path has gone. */ | |
519 | case CRW_ERC_PERRN: | |
e6b6e10a | 520 | chsc_chp_offline(chpid); |
c1156189 CH |
521 | break; |
522 | default: | |
523 | CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", | |
524 | crw0->erc); | |
525 | } | |
e6b6e10a | 526 | } |
e5854a58 | 527 | |
c820de39 CH |
528 | int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct res_acc_data *data) |
529 | { | |
530 | int i; | |
531 | int mask; | |
532 | ||
533 | for (i = 0; i < 8; i++) { | |
534 | mask = 0x80 >> i; | |
535 | if (!(ssd->path_mask & mask)) | |
536 | continue; | |
537 | if (!chp_id_is_equal(&ssd->chpid[i], &data->chpid)) | |
538 | continue; | |
539 | if ((ssd->fla_valid_mask & mask) && | |
540 | ((ssd->fla[i] & data->fla_mask) != data->fla)) | |
541 | continue; | |
542 | return mask; | |
543 | } | |
544 | return 0; | |
545 | } | |
546 | EXPORT_SYMBOL_GPL(chp_ssd_get_mask); | |
547 | ||
e5854a58 PO |
548 | static inline int info_bit_num(struct chp_id id) |
549 | { | |
550 | return id.id + id.cssid * (__MAX_CHPID + 1); | |
551 | } | |
552 | ||
553 | /* Force chp_info refresh on next call to info_validate(). */ | |
554 | static void info_expire(void) | |
555 | { | |
556 | mutex_lock(&info_lock); | |
557 | chp_info_expires = jiffies - 1; | |
558 | mutex_unlock(&info_lock); | |
559 | } | |
560 | ||
561 | /* Ensure that chp_info is up-to-date. */ | |
562 | static int info_update(void) | |
563 | { | |
564 | int rc; | |
565 | ||
566 | mutex_lock(&info_lock); | |
567 | rc = 0; | |
568 | if (time_after(jiffies, chp_info_expires)) { | |
569 | /* Data is too old, update. */ | |
570 | rc = sclp_chp_read_info(&chp_info); | |
571 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; | |
572 | } | |
573 | mutex_unlock(&info_lock); | |
574 | ||
575 | return rc; | |
576 | } | |
577 | ||
578 | /** | |
579 | * chp_info_get_status - retrieve configure status of a channel-path | |
580 | * @chpid: channel-path ID | |
581 | * | |
582 | * On success, return 0 for standby, 1 for configured, 2 for reserved, | |
583 | * 3 for not recognized. Return negative error code on error. | |
584 | */ | |
585 | int chp_info_get_status(struct chp_id chpid) | |
586 | { | |
587 | int rc; | |
588 | int bit; | |
589 | ||
590 | rc = info_update(); | |
591 | if (rc) | |
592 | return rc; | |
593 | ||
594 | bit = info_bit_num(chpid); | |
595 | mutex_lock(&info_lock); | |
596 | if (!chp_test_bit(chp_info.recognized, bit)) | |
597 | rc = CHP_STATUS_NOT_RECOGNIZED; | |
598 | else if (chp_test_bit(chp_info.configured, bit)) | |
599 | rc = CHP_STATUS_CONFIGURED; | |
600 | else if (chp_test_bit(chp_info.standby, bit)) | |
601 | rc = CHP_STATUS_STANDBY; | |
602 | else | |
603 | rc = CHP_STATUS_RESERVED; | |
604 | mutex_unlock(&info_lock); | |
605 | ||
606 | return rc; | |
607 | } | |
608 | ||
609 | /* Return configure task for chpid. */ | |
610 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) | |
611 | { | |
612 | return chp_cfg_task[chpid.cssid][chpid.id]; | |
613 | } | |
614 | ||
615 | /* Set configure task for chpid. */ | |
616 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) | |
617 | { | |
618 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; | |
619 | } | |
620 | ||
621 | /* Perform one configure/deconfigure request. Reschedule work function until | |
622 | * last request. */ | |
623 | static void cfg_func(struct work_struct *work) | |
624 | { | |
625 | struct chp_id chpid; | |
626 | enum cfg_task_t t; | |
627 | ||
628 | mutex_lock(&cfg_lock); | |
629 | t = cfg_none; | |
630 | chp_id_for_each(&chpid) { | |
631 | t = cfg_get_task(chpid); | |
632 | if (t != cfg_none) { | |
633 | cfg_set_task(chpid, cfg_none); | |
634 | break; | |
635 | } | |
636 | } | |
637 | mutex_unlock(&cfg_lock); | |
638 | ||
639 | switch (t) { | |
640 | case cfg_configure: | |
641 | sclp_chp_configure(chpid); | |
642 | info_expire(); | |
643 | chsc_chp_online(chpid); | |
644 | break; | |
645 | case cfg_deconfigure: | |
646 | sclp_chp_deconfigure(chpid); | |
647 | info_expire(); | |
648 | chsc_chp_offline(chpid); | |
649 | break; | |
650 | case cfg_none: | |
651 | /* Get updated information after last change. */ | |
652 | info_update(); | |
653 | mutex_lock(&cfg_lock); | |
654 | cfg_busy = 0; | |
655 | mutex_unlock(&cfg_lock); | |
656 | wake_up_interruptible(&cfg_wait_queue); | |
657 | return; | |
658 | } | |
659 | queue_work(chp_wq, &cfg_work); | |
660 | } | |
661 | ||
662 | /** | |
663 | * chp_cfg_schedule - schedule chpid configuration request | |
664 | * @chpid - channel-path ID | |
665 | * @configure - Non-zero for configure, zero for deconfigure | |
666 | * | |
667 | * Schedule a channel-path configuration/deconfiguration request. | |
668 | */ | |
669 | void chp_cfg_schedule(struct chp_id chpid, int configure) | |
670 | { | |
671 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, | |
672 | configure); | |
673 | mutex_lock(&cfg_lock); | |
674 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); | |
675 | cfg_busy = 1; | |
676 | mutex_unlock(&cfg_lock); | |
677 | queue_work(chp_wq, &cfg_work); | |
678 | } | |
679 | ||
680 | /** | |
681 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request | |
682 | * @chpid - channel-path ID | |
683 | * | |
684 | * Cancel an active channel-path deconfiguration request if it has not yet | |
685 | * been performed. | |
686 | */ | |
687 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) | |
688 | { | |
689 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); | |
690 | mutex_lock(&cfg_lock); | |
691 | if (cfg_get_task(chpid) == cfg_deconfigure) | |
692 | cfg_set_task(chpid, cfg_none); | |
693 | mutex_unlock(&cfg_lock); | |
694 | } | |
695 | ||
696 | static int cfg_wait_idle(void) | |
697 | { | |
698 | if (wait_event_interruptible(cfg_wait_queue, !cfg_busy)) | |
699 | return -ERESTARTSYS; | |
700 | return 0; | |
701 | } | |
702 | ||
703 | static int __init chp_init(void) | |
704 | { | |
705 | struct chp_id chpid; | |
c1156189 | 706 | int ret; |
e5854a58 | 707 | |
c1156189 CH |
708 | ret = s390_register_crw_handler(CRW_RSC_CPATH, chp_process_crw); |
709 | if (ret) | |
710 | return ret; | |
e5854a58 | 711 | chp_wq = create_singlethread_workqueue("cio_chp"); |
c1156189 CH |
712 | if (!chp_wq) { |
713 | s390_unregister_crw_handler(CRW_RSC_CPATH); | |
e5854a58 | 714 | return -ENOMEM; |
c1156189 | 715 | } |
e5854a58 PO |
716 | INIT_WORK(&cfg_work, cfg_func); |
717 | init_waitqueue_head(&cfg_wait_queue); | |
718 | if (info_update()) | |
719 | return 0; | |
720 | /* Register available channel-paths. */ | |
721 | chp_id_for_each(&chpid) { | |
722 | if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED) | |
723 | chp_new(chpid); | |
724 | } | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | subsys_initcall(chp_init); |