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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 | |
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46 | /* Time after which channel-path status may be outdated.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 | } | |
44a1c19e | 98 | EXPORT_SYMBOL_GPL(chp_get_sch_opm); |
e6b6e10a PO |
99 | |
100 | /** | |
101 | * chp_is_registered - check if a channel-path is registered | |
102 | * @chpid: channel-path ID | |
103 | * | |
104 | * Return non-zero if a channel-path with the given chpid is registered, | |
105 | * zero otherwise. | |
106 | */ | |
107 | int chp_is_registered(struct chp_id chpid) | |
108 | { | |
109 | return chpid_to_chp(chpid) != NULL; | |
110 | } | |
111 | ||
112 | /* | |
113 | * Function: s390_vary_chpid | |
114 | * Varies the specified chpid online or offline | |
115 | */ | |
116 | static int s390_vary_chpid(struct chp_id chpid, int on) | |
117 | { | |
118 | char dbf_text[15]; | |
119 | int status; | |
120 | ||
121 | sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, | |
122 | chpid.id); | |
a0ea22c3 | 123 | CIO_TRACE_EVENT(2, dbf_text); |
e6b6e10a PO |
124 | |
125 | status = chp_get_status(chpid); | |
e6b6e10a | 126 | if (!on && !status) { |
e556bbbd | 127 | printk(KERN_ERR "cio: chpid %x.%02x is already offline\n", |
e6b6e10a PO |
128 | chpid.cssid, chpid.id); |
129 | return -EINVAL; | |
130 | } | |
131 | ||
132 | set_chp_logically_online(chpid, on); | |
133 | chsc_chp_vary(chpid, on); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | /* | |
138 | * Channel measurement related functions | |
139 | */ | |
91a69029 ZR |
140 | static ssize_t chp_measurement_chars_read(struct kobject *kobj, |
141 | struct bin_attribute *bin_attr, | |
142 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
143 | { |
144 | struct channel_path *chp; | |
364c8558 | 145 | struct device *device; |
e6b6e10a | 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 | ||
d9cef21a AM |
152 | return memory_read_from_buffer(buf, count, &off, |
153 | chp->cmg_chars, sizeof(struct cmg_chars)); | |
e6b6e10a PO |
154 | } |
155 | ||
156 | static struct bin_attribute chp_measurement_chars_attr = { | |
157 | .attr = { | |
158 | .name = "measurement_chars", | |
159 | .mode = S_IRUSR, | |
e6b6e10a PO |
160 | }, |
161 | .size = sizeof(struct cmg_chars), | |
162 | .read = chp_measurement_chars_read, | |
163 | }; | |
164 | ||
165 | static void chp_measurement_copy_block(struct cmg_entry *buf, | |
166 | struct channel_subsystem *css, | |
167 | struct chp_id chpid) | |
168 | { | |
169 | void *area; | |
170 | struct cmg_entry *entry, reference_buf; | |
171 | int idx; | |
172 | ||
173 | if (chpid.id < 128) { | |
174 | area = css->cub_addr1; | |
175 | idx = chpid.id; | |
176 | } else { | |
177 | area = css->cub_addr2; | |
178 | idx = chpid.id - 128; | |
179 | } | |
180 | entry = area + (idx * sizeof(struct cmg_entry)); | |
181 | do { | |
182 | memcpy(buf, entry, sizeof(*entry)); | |
183 | memcpy(&reference_buf, entry, sizeof(*entry)); | |
184 | } while (reference_buf.values[0] != buf->values[0]); | |
185 | } | |
186 | ||
91a69029 ZR |
187 | static ssize_t chp_measurement_read(struct kobject *kobj, |
188 | struct bin_attribute *bin_attr, | |
189 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
190 | { |
191 | struct channel_path *chp; | |
192 | struct channel_subsystem *css; | |
364c8558 | 193 | struct device *device; |
e6b6e10a PO |
194 | unsigned int size; |
195 | ||
364c8558 HC |
196 | device = container_of(kobj, struct device, kobj); |
197 | chp = to_channelpath(device); | |
e6b6e10a PO |
198 | css = to_css(chp->dev.parent); |
199 | ||
200 | size = sizeof(struct cmg_entry); | |
201 | ||
202 | /* Only allow single reads. */ | |
203 | if (off || count < size) | |
204 | return 0; | |
205 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); | |
206 | count = size; | |
207 | return count; | |
208 | } | |
209 | ||
210 | static struct bin_attribute chp_measurement_attr = { | |
211 | .attr = { | |
212 | .name = "measurement", | |
213 | .mode = S_IRUSR, | |
e6b6e10a PO |
214 | }, |
215 | .size = sizeof(struct cmg_entry), | |
216 | .read = chp_measurement_read, | |
217 | }; | |
218 | ||
219 | void chp_remove_cmg_attr(struct channel_path *chp) | |
220 | { | |
221 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
222 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); | |
223 | } | |
224 | ||
225 | int chp_add_cmg_attr(struct channel_path *chp) | |
226 | { | |
227 | int ret; | |
228 | ||
229 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
230 | if (ret) | |
231 | return ret; | |
232 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); | |
233 | if (ret) | |
234 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
235 | return ret; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Files for the channel path entries. | |
240 | */ | |
241 | static ssize_t chp_status_show(struct device *dev, | |
242 | struct device_attribute *attr, char *buf) | |
243 | { | |
05469607 | 244 | struct channel_path *chp = to_channelpath(dev); |
e6b6e10a PO |
245 | |
246 | if (!chp) | |
247 | return 0; | |
248 | return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") : | |
249 | sprintf(buf, "offline\n")); | |
250 | } | |
251 | ||
252 | static ssize_t chp_status_write(struct device *dev, | |
253 | struct device_attribute *attr, | |
254 | const char *buf, size_t count) | |
255 | { | |
05469607 | 256 | struct channel_path *cp = to_channelpath(dev); |
e6b6e10a PO |
257 | char cmd[10]; |
258 | int num_args; | |
259 | int error; | |
260 | ||
261 | num_args = sscanf(buf, "%5s", cmd); | |
262 | if (!num_args) | |
263 | return count; | |
264 | ||
265 | if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) | |
266 | error = s390_vary_chpid(cp->chpid, 1); | |
267 | else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) | |
268 | error = s390_vary_chpid(cp->chpid, 0); | |
269 | else | |
270 | error = -EINVAL; | |
271 | ||
272 | return error < 0 ? error : count; | |
273 | ||
274 | } | |
275 | ||
276 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); | |
277 | ||
e5854a58 PO |
278 | static ssize_t chp_configure_show(struct device *dev, |
279 | struct device_attribute *attr, char *buf) | |
280 | { | |
281 | struct channel_path *cp; | |
282 | int status; | |
283 | ||
05469607 | 284 | cp = to_channelpath(dev); |
e5854a58 PO |
285 | status = chp_info_get_status(cp->chpid); |
286 | if (status < 0) | |
287 | return status; | |
288 | ||
289 | return snprintf(buf, PAGE_SIZE, "%d\n", status); | |
290 | } | |
291 | ||
292 | static int cfg_wait_idle(void); | |
293 | ||
294 | static ssize_t chp_configure_write(struct device *dev, | |
295 | struct device_attribute *attr, | |
296 | const char *buf, size_t count) | |
297 | { | |
298 | struct channel_path *cp; | |
299 | int val; | |
300 | char delim; | |
301 | ||
302 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
303 | return -EINVAL; | |
304 | if (val != 0 && val != 1) | |
305 | return -EINVAL; | |
05469607 | 306 | cp = to_channelpath(dev); |
e5854a58 PO |
307 | chp_cfg_schedule(cp->chpid, val); |
308 | cfg_wait_idle(); | |
309 | ||
310 | return count; | |
311 | } | |
312 | ||
313 | static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); | |
314 | ||
e6b6e10a PO |
315 | static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
316 | char *buf) | |
317 | { | |
05469607 | 318 | struct channel_path *chp = to_channelpath(dev); |
e6b6e10a PO |
319 | |
320 | if (!chp) | |
321 | return 0; | |
322 | return sprintf(buf, "%x\n", chp->desc.desc); | |
323 | } | |
324 | ||
325 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); | |
326 | ||
327 | static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, | |
328 | char *buf) | |
329 | { | |
330 | struct channel_path *chp = to_channelpath(dev); | |
331 | ||
332 | if (!chp) | |
333 | return 0; | |
334 | if (chp->cmg == -1) /* channel measurements not available */ | |
335 | return sprintf(buf, "unknown\n"); | |
336 | return sprintf(buf, "%x\n", chp->cmg); | |
337 | } | |
338 | ||
339 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); | |
340 | ||
341 | static ssize_t chp_shared_show(struct device *dev, | |
342 | struct device_attribute *attr, char *buf) | |
343 | { | |
344 | struct channel_path *chp = to_channelpath(dev); | |
345 | ||
346 | if (!chp) | |
347 | return 0; | |
348 | if (chp->shared == -1) /* channel measurements not available */ | |
349 | return sprintf(buf, "unknown\n"); | |
350 | return sprintf(buf, "%x\n", chp->shared); | |
351 | } | |
352 | ||
353 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); | |
354 | ||
a0ea22c3 | 355 | static struct attribute *chp_attrs[] = { |
e6b6e10a | 356 | &dev_attr_status.attr, |
e5854a58 | 357 | &dev_attr_configure.attr, |
e6b6e10a PO |
358 | &dev_attr_type.attr, |
359 | &dev_attr_cmg.attr, | |
360 | &dev_attr_shared.attr, | |
361 | NULL, | |
362 | }; | |
363 | ||
364 | static struct attribute_group chp_attr_group = { | |
365 | .attrs = chp_attrs, | |
366 | }; | |
367 | ||
368 | static void chp_release(struct device *dev) | |
369 | { | |
370 | struct channel_path *cp; | |
371 | ||
05469607 | 372 | cp = to_channelpath(dev); |
e6b6e10a PO |
373 | kfree(cp); |
374 | } | |
375 | ||
376 | /** | |
377 | * chp_new - register a new channel-path | |
378 | * @chpid - channel-path ID | |
379 | * | |
380 | * Create and register data structure representing new channel-path. Return | |
381 | * zero on success, non-zero otherwise. | |
382 | */ | |
383 | int chp_new(struct chp_id chpid) | |
384 | { | |
385 | struct channel_path *chp; | |
386 | int ret; | |
387 | ||
e5854a58 PO |
388 | if (chp_is_registered(chpid)) |
389 | return 0; | |
e6b6e10a PO |
390 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
391 | if (!chp) | |
392 | return -ENOMEM; | |
393 | ||
394 | /* fill in status, etc. */ | |
395 | chp->chpid = chpid; | |
396 | chp->state = 1; | |
7c9f4e3a | 397 | chp->dev.parent = &channel_subsystems[chpid.cssid]->device; |
e6b6e10a PO |
398 | chp->dev.release = chp_release; |
399 | snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid, | |
400 | chpid.id); | |
401 | ||
402 | /* Obtain channel path description and fill it in. */ | |
9d92a7e1 | 403 | ret = chsc_determine_base_channel_path_desc(chpid, &chp->desc); |
e6b6e10a PO |
404 | if (ret) |
405 | goto out_free; | |
c9182e0f PO |
406 | if ((chp->desc.flags & 0x80) == 0) { |
407 | ret = -ENODEV; | |
408 | goto out_free; | |
409 | } | |
e6b6e10a | 410 | /* Get channel-measurement characteristics. */ |
75784c00 | 411 | if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) { |
e6b6e10a PO |
412 | ret = chsc_get_channel_measurement_chars(chp); |
413 | if (ret) | |
414 | goto out_free; | |
415 | } else { | |
e6b6e10a PO |
416 | chp->cmg = -1; |
417 | } | |
418 | ||
419 | /* make it known to the system */ | |
420 | ret = device_register(&chp->dev); | |
421 | if (ret) { | |
e556bbbd CH |
422 | CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
423 | chpid.cssid, chpid.id, ret); | |
e6b6e10a PO |
424 | goto out_free; |
425 | } | |
426 | ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group); | |
427 | if (ret) { | |
428 | device_unregister(&chp->dev); | |
429 | goto out_free; | |
430 | } | |
7c9f4e3a CH |
431 | mutex_lock(&channel_subsystems[chpid.cssid]->mutex); |
432 | if (channel_subsystems[chpid.cssid]->cm_enabled) { | |
e6b6e10a PO |
433 | ret = chp_add_cmg_attr(chp); |
434 | if (ret) { | |
435 | sysfs_remove_group(&chp->dev.kobj, &chp_attr_group); | |
436 | device_unregister(&chp->dev); | |
7c9f4e3a | 437 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); |
e6b6e10a PO |
438 | goto out_free; |
439 | } | |
440 | } | |
7c9f4e3a CH |
441 | channel_subsystems[chpid.cssid]->chps[chpid.id] = chp; |
442 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); | |
e6b6e10a PO |
443 | return ret; |
444 | out_free: | |
445 | kfree(chp); | |
446 | return ret; | |
447 | } | |
448 | ||
449 | /** | |
450 | * chp_get_chp_desc - return newly allocated channel-path description | |
451 | * @chpid: channel-path ID | |
452 | * | |
453 | * On success return a newly allocated copy of the channel-path description | |
454 | * data associated with the given channel-path ID. Return %NULL on error. | |
455 | */ | |
456 | void *chp_get_chp_desc(struct chp_id chpid) | |
457 | { | |
458 | struct channel_path *chp; | |
459 | struct channel_path_desc *desc; | |
460 | ||
461 | chp = chpid_to_chp(chpid); | |
462 | if (!chp) | |
463 | return NULL; | |
464 | desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); | |
465 | if (!desc) | |
466 | return NULL; | |
467 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); | |
468 | return desc; | |
469 | } | |
470 | ||
471 | /** | |
472 | * chp_process_crw - process channel-path status change | |
c1156189 CH |
473 | * @crw0: channel report-word to handler |
474 | * @crw1: second channel-report word (always NULL) | |
475 | * @overflow: crw overflow indication | |
e6b6e10a PO |
476 | * |
477 | * Handle channel-report-words indicating that the status of a channel-path | |
478 | * has changed. | |
479 | */ | |
c1156189 CH |
480 | static void chp_process_crw(struct crw *crw0, struct crw *crw1, |
481 | int overflow) | |
e6b6e10a PO |
482 | { |
483 | struct chp_id chpid; | |
484 | ||
c1156189 CH |
485 | if (overflow) { |
486 | css_schedule_eval_all(); | |
487 | return; | |
488 | } | |
489 | CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " | |
490 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
491 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
492 | crw0->erc, crw0->rsid); | |
493 | /* | |
494 | * Check for solicited machine checks. These are | |
495 | * created by reset channel path and need not be | |
496 | * handled here. | |
497 | */ | |
498 | if (crw0->slct) { | |
499 | CIO_CRW_EVENT(2, "solicited machine check for " | |
500 | "channel path %02X\n", crw0->rsid); | |
501 | return; | |
502 | } | |
e6b6e10a | 503 | chp_id_init(&chpid); |
c1156189 CH |
504 | chpid.id = crw0->rsid; |
505 | switch (crw0->erc) { | |
506 | case CRW_ERC_IPARM: /* Path has come. */ | |
e6b6e10a PO |
507 | if (!chp_is_registered(chpid)) |
508 | chp_new(chpid); | |
83b3370c | 509 | chsc_chp_online(chpid); |
c1156189 CH |
510 | break; |
511 | case CRW_ERC_PERRI: /* Path has gone. */ | |
512 | case CRW_ERC_PERRN: | |
e6b6e10a | 513 | chsc_chp_offline(chpid); |
c1156189 CH |
514 | break; |
515 | default: | |
516 | CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", | |
517 | crw0->erc); | |
518 | } | |
e6b6e10a | 519 | } |
e5854a58 | 520 | |
99611f87 | 521 | int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) |
c820de39 CH |
522 | { |
523 | int i; | |
524 | int mask; | |
525 | ||
526 | for (i = 0; i < 8; i++) { | |
527 | mask = 0x80 >> i; | |
528 | if (!(ssd->path_mask & mask)) | |
529 | continue; | |
99611f87 | 530 | if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) |
c820de39 CH |
531 | continue; |
532 | if ((ssd->fla_valid_mask & mask) && | |
99611f87 | 533 | ((ssd->fla[i] & link->fla_mask) != link->fla)) |
c820de39 CH |
534 | continue; |
535 | return mask; | |
536 | } | |
537 | return 0; | |
538 | } | |
539 | EXPORT_SYMBOL_GPL(chp_ssd_get_mask); | |
540 | ||
e5854a58 PO |
541 | static inline int info_bit_num(struct chp_id id) |
542 | { | |
543 | return id.id + id.cssid * (__MAX_CHPID + 1); | |
544 | } | |
545 | ||
546 | /* Force chp_info refresh on next call to info_validate(). */ | |
547 | static void info_expire(void) | |
548 | { | |
549 | mutex_lock(&info_lock); | |
550 | chp_info_expires = jiffies - 1; | |
551 | mutex_unlock(&info_lock); | |
552 | } | |
553 | ||
554 | /* Ensure that chp_info is up-to-date. */ | |
555 | static int info_update(void) | |
556 | { | |
557 | int rc; | |
558 | ||
559 | mutex_lock(&info_lock); | |
560 | rc = 0; | |
561 | if (time_after(jiffies, chp_info_expires)) { | |
562 | /* Data is too old, update. */ | |
563 | rc = sclp_chp_read_info(&chp_info); | |
564 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; | |
565 | } | |
566 | mutex_unlock(&info_lock); | |
567 | ||
568 | return rc; | |
569 | } | |
570 | ||
571 | /** | |
572 | * chp_info_get_status - retrieve configure status of a channel-path | |
573 | * @chpid: channel-path ID | |
574 | * | |
575 | * On success, return 0 for standby, 1 for configured, 2 for reserved, | |
576 | * 3 for not recognized. Return negative error code on error. | |
577 | */ | |
578 | int chp_info_get_status(struct chp_id chpid) | |
579 | { | |
580 | int rc; | |
581 | int bit; | |
582 | ||
583 | rc = info_update(); | |
584 | if (rc) | |
585 | return rc; | |
586 | ||
587 | bit = info_bit_num(chpid); | |
588 | mutex_lock(&info_lock); | |
589 | if (!chp_test_bit(chp_info.recognized, bit)) | |
590 | rc = CHP_STATUS_NOT_RECOGNIZED; | |
591 | else if (chp_test_bit(chp_info.configured, bit)) | |
592 | rc = CHP_STATUS_CONFIGURED; | |
593 | else if (chp_test_bit(chp_info.standby, bit)) | |
594 | rc = CHP_STATUS_STANDBY; | |
595 | else | |
596 | rc = CHP_STATUS_RESERVED; | |
597 | mutex_unlock(&info_lock); | |
598 | ||
599 | return rc; | |
600 | } | |
601 | ||
602 | /* Return configure task for chpid. */ | |
603 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) | |
604 | { | |
605 | return chp_cfg_task[chpid.cssid][chpid.id]; | |
606 | } | |
607 | ||
608 | /* Set configure task for chpid. */ | |
609 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) | |
610 | { | |
611 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; | |
612 | } | |
613 | ||
614 | /* Perform one configure/deconfigure request. Reschedule work function until | |
615 | * last request. */ | |
616 | static void cfg_func(struct work_struct *work) | |
617 | { | |
618 | struct chp_id chpid; | |
619 | enum cfg_task_t t; | |
683c5418 | 620 | int rc; |
e5854a58 PO |
621 | |
622 | mutex_lock(&cfg_lock); | |
623 | t = cfg_none; | |
624 | chp_id_for_each(&chpid) { | |
625 | t = cfg_get_task(chpid); | |
626 | if (t != cfg_none) { | |
627 | cfg_set_task(chpid, cfg_none); | |
628 | break; | |
629 | } | |
630 | } | |
631 | mutex_unlock(&cfg_lock); | |
632 | ||
633 | switch (t) { | |
634 | case cfg_configure: | |
683c5418 PO |
635 | rc = sclp_chp_configure(chpid); |
636 | if (rc) | |
637 | CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" | |
638 | "%d\n", chpid.cssid, chpid.id, rc); | |
639 | else { | |
640 | info_expire(); | |
641 | chsc_chp_online(chpid); | |
642 | } | |
e5854a58 PO |
643 | break; |
644 | case cfg_deconfigure: | |
683c5418 PO |
645 | rc = sclp_chp_deconfigure(chpid); |
646 | if (rc) | |
647 | CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" | |
648 | "%d\n", chpid.cssid, chpid.id, rc); | |
649 | else { | |
650 | info_expire(); | |
651 | chsc_chp_offline(chpid); | |
652 | } | |
e5854a58 PO |
653 | break; |
654 | case cfg_none: | |
655 | /* Get updated information after last change. */ | |
656 | info_update(); | |
657 | mutex_lock(&cfg_lock); | |
658 | cfg_busy = 0; | |
659 | mutex_unlock(&cfg_lock); | |
660 | wake_up_interruptible(&cfg_wait_queue); | |
661 | return; | |
662 | } | |
663 | queue_work(chp_wq, &cfg_work); | |
664 | } | |
665 | ||
666 | /** | |
667 | * chp_cfg_schedule - schedule chpid configuration request | |
668 | * @chpid - channel-path ID | |
669 | * @configure - Non-zero for configure, zero for deconfigure | |
670 | * | |
671 | * Schedule a channel-path configuration/deconfiguration request. | |
672 | */ | |
673 | void chp_cfg_schedule(struct chp_id chpid, int configure) | |
674 | { | |
675 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, | |
676 | configure); | |
677 | mutex_lock(&cfg_lock); | |
678 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); | |
679 | cfg_busy = 1; | |
680 | mutex_unlock(&cfg_lock); | |
681 | queue_work(chp_wq, &cfg_work); | |
682 | } | |
683 | ||
684 | /** | |
685 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request | |
686 | * @chpid - channel-path ID | |
687 | * | |
688 | * Cancel an active channel-path deconfiguration request if it has not yet | |
689 | * been performed. | |
690 | */ | |
691 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) | |
692 | { | |
693 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); | |
694 | mutex_lock(&cfg_lock); | |
695 | if (cfg_get_task(chpid) == cfg_deconfigure) | |
696 | cfg_set_task(chpid, cfg_none); | |
697 | mutex_unlock(&cfg_lock); | |
698 | } | |
699 | ||
700 | static int cfg_wait_idle(void) | |
701 | { | |
702 | if (wait_event_interruptible(cfg_wait_queue, !cfg_busy)) | |
703 | return -ERESTARTSYS; | |
704 | return 0; | |
705 | } | |
706 | ||
707 | static int __init chp_init(void) | |
708 | { | |
709 | struct chp_id chpid; | |
c1156189 | 710 | int ret; |
e5854a58 | 711 | |
c1156189 CH |
712 | ret = s390_register_crw_handler(CRW_RSC_CPATH, chp_process_crw); |
713 | if (ret) | |
714 | return ret; | |
e5854a58 | 715 | chp_wq = create_singlethread_workqueue("cio_chp"); |
c1156189 CH |
716 | if (!chp_wq) { |
717 | s390_unregister_crw_handler(CRW_RSC_CPATH); | |
e5854a58 | 718 | return -ENOMEM; |
c1156189 | 719 | } |
e5854a58 PO |
720 | INIT_WORK(&cfg_work, cfg_func); |
721 | init_waitqueue_head(&cfg_wait_queue); | |
722 | if (info_update()) | |
723 | return 0; | |
724 | /* Register available channel-paths. */ | |
725 | chp_id_for_each(&chpid) { | |
726 | if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED) | |
727 | chp_new(chpid); | |
728 | } | |
729 | ||
730 | return 0; | |
731 | } | |
732 | ||
733 | subsys_initcall(chp_init); |