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> |
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46 | /* Time after which channel-path status may be outdated.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); | |
c78aa6cb ME |
126 | if (!on && !status) |
127 | return 0; | |
e6b6e10a PO |
128 | |
129 | set_chp_logically_online(chpid, on); | |
130 | chsc_chp_vary(chpid, on); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* | |
135 | * Channel measurement related functions | |
136 | */ | |
91a69029 ZR |
137 | static ssize_t chp_measurement_chars_read(struct kobject *kobj, |
138 | struct bin_attribute *bin_attr, | |
139 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
140 | { |
141 | struct channel_path *chp; | |
364c8558 | 142 | struct device *device; |
e6b6e10a | 143 | |
364c8558 HC |
144 | device = container_of(kobj, struct device, kobj); |
145 | chp = to_channelpath(device); | |
e6b6e10a PO |
146 | if (!chp->cmg_chars) |
147 | return 0; | |
148 | ||
d9cef21a AM |
149 | return memory_read_from_buffer(buf, count, &off, |
150 | chp->cmg_chars, sizeof(struct cmg_chars)); | |
e6b6e10a PO |
151 | } |
152 | ||
153 | static struct bin_attribute chp_measurement_chars_attr = { | |
154 | .attr = { | |
155 | .name = "measurement_chars", | |
156 | .mode = S_IRUSR, | |
e6b6e10a PO |
157 | }, |
158 | .size = sizeof(struct cmg_chars), | |
159 | .read = chp_measurement_chars_read, | |
160 | }; | |
161 | ||
162 | static void chp_measurement_copy_block(struct cmg_entry *buf, | |
163 | struct channel_subsystem *css, | |
164 | struct chp_id chpid) | |
165 | { | |
166 | void *area; | |
167 | struct cmg_entry *entry, reference_buf; | |
168 | int idx; | |
169 | ||
170 | if (chpid.id < 128) { | |
171 | area = css->cub_addr1; | |
172 | idx = chpid.id; | |
173 | } else { | |
174 | area = css->cub_addr2; | |
175 | idx = chpid.id - 128; | |
176 | } | |
177 | entry = area + (idx * sizeof(struct cmg_entry)); | |
178 | do { | |
179 | memcpy(buf, entry, sizeof(*entry)); | |
180 | memcpy(&reference_buf, entry, sizeof(*entry)); | |
181 | } while (reference_buf.values[0] != buf->values[0]); | |
182 | } | |
183 | ||
91a69029 ZR |
184 | static ssize_t chp_measurement_read(struct kobject *kobj, |
185 | struct bin_attribute *bin_attr, | |
186 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
187 | { |
188 | struct channel_path *chp; | |
189 | struct channel_subsystem *css; | |
364c8558 | 190 | struct device *device; |
e6b6e10a PO |
191 | unsigned int size; |
192 | ||
364c8558 HC |
193 | device = container_of(kobj, struct device, kobj); |
194 | chp = to_channelpath(device); | |
e6b6e10a PO |
195 | css = to_css(chp->dev.parent); |
196 | ||
197 | size = sizeof(struct cmg_entry); | |
198 | ||
199 | /* Only allow single reads. */ | |
200 | if (off || count < size) | |
201 | return 0; | |
202 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); | |
203 | count = size; | |
204 | return count; | |
205 | } | |
206 | ||
207 | static struct bin_attribute chp_measurement_attr = { | |
208 | .attr = { | |
209 | .name = "measurement", | |
210 | .mode = S_IRUSR, | |
e6b6e10a PO |
211 | }, |
212 | .size = sizeof(struct cmg_entry), | |
213 | .read = chp_measurement_read, | |
214 | }; | |
215 | ||
216 | void chp_remove_cmg_attr(struct channel_path *chp) | |
217 | { | |
218 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
219 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); | |
220 | } | |
221 | ||
222 | int chp_add_cmg_attr(struct channel_path *chp) | |
223 | { | |
224 | int ret; | |
225 | ||
226 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
227 | if (ret) | |
228 | return ret; | |
229 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); | |
230 | if (ret) | |
231 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
232 | return ret; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Files for the channel path entries. | |
237 | */ | |
238 | static ssize_t chp_status_show(struct device *dev, | |
239 | struct device_attribute *attr, char *buf) | |
240 | { | |
05469607 | 241 | struct channel_path *chp = to_channelpath(dev); |
e6b6e10a PO |
242 | |
243 | if (!chp) | |
244 | return 0; | |
245 | return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") : | |
246 | sprintf(buf, "offline\n")); | |
247 | } | |
248 | ||
249 | static ssize_t chp_status_write(struct device *dev, | |
250 | struct device_attribute *attr, | |
251 | const char *buf, size_t count) | |
252 | { | |
05469607 | 253 | struct channel_path *cp = to_channelpath(dev); |
e6b6e10a PO |
254 | char cmd[10]; |
255 | int num_args; | |
256 | int error; | |
257 | ||
258 | num_args = sscanf(buf, "%5s", cmd); | |
259 | if (!num_args) | |
260 | return count; | |
261 | ||
262 | if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) | |
263 | error = s390_vary_chpid(cp->chpid, 1); | |
264 | else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) | |
265 | error = s390_vary_chpid(cp->chpid, 0); | |
266 | else | |
267 | error = -EINVAL; | |
268 | ||
269 | return error < 0 ? error : count; | |
270 | ||
271 | } | |
272 | ||
273 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); | |
274 | ||
e5854a58 PO |
275 | static ssize_t chp_configure_show(struct device *dev, |
276 | struct device_attribute *attr, char *buf) | |
277 | { | |
278 | struct channel_path *cp; | |
279 | int status; | |
280 | ||
05469607 | 281 | cp = to_channelpath(dev); |
e5854a58 PO |
282 | status = chp_info_get_status(cp->chpid); |
283 | if (status < 0) | |
284 | return status; | |
285 | ||
286 | return snprintf(buf, PAGE_SIZE, "%d\n", status); | |
287 | } | |
288 | ||
289 | static int cfg_wait_idle(void); | |
290 | ||
291 | static ssize_t chp_configure_write(struct device *dev, | |
292 | struct device_attribute *attr, | |
293 | const char *buf, size_t count) | |
294 | { | |
295 | struct channel_path *cp; | |
296 | int val; | |
297 | char delim; | |
298 | ||
299 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
300 | return -EINVAL; | |
301 | if (val != 0 && val != 1) | |
302 | return -EINVAL; | |
05469607 | 303 | cp = to_channelpath(dev); |
e5854a58 PO |
304 | chp_cfg_schedule(cp->chpid, val); |
305 | cfg_wait_idle(); | |
306 | ||
307 | return count; | |
308 | } | |
309 | ||
310 | static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); | |
311 | ||
e6b6e10a PO |
312 | static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
313 | char *buf) | |
314 | { | |
05469607 | 315 | struct channel_path *chp = to_channelpath(dev); |
e6b6e10a PO |
316 | |
317 | if (!chp) | |
318 | return 0; | |
319 | return sprintf(buf, "%x\n", chp->desc.desc); | |
320 | } | |
321 | ||
322 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); | |
323 | ||
324 | static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, | |
325 | char *buf) | |
326 | { | |
327 | struct channel_path *chp = to_channelpath(dev); | |
328 | ||
329 | if (!chp) | |
330 | return 0; | |
331 | if (chp->cmg == -1) /* channel measurements not available */ | |
332 | return sprintf(buf, "unknown\n"); | |
333 | return sprintf(buf, "%x\n", chp->cmg); | |
334 | } | |
335 | ||
336 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); | |
337 | ||
338 | static ssize_t chp_shared_show(struct device *dev, | |
339 | struct device_attribute *attr, char *buf) | |
340 | { | |
341 | struct channel_path *chp = to_channelpath(dev); | |
342 | ||
343 | if (!chp) | |
344 | return 0; | |
345 | if (chp->shared == -1) /* channel measurements not available */ | |
346 | return sprintf(buf, "unknown\n"); | |
347 | return sprintf(buf, "%x\n", chp->shared); | |
348 | } | |
349 | ||
350 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); | |
351 | ||
a0ea22c3 | 352 | static struct attribute *chp_attrs[] = { |
e6b6e10a | 353 | &dev_attr_status.attr, |
e5854a58 | 354 | &dev_attr_configure.attr, |
e6b6e10a PO |
355 | &dev_attr_type.attr, |
356 | &dev_attr_cmg.attr, | |
357 | &dev_attr_shared.attr, | |
358 | NULL, | |
359 | }; | |
360 | ||
361 | static struct attribute_group chp_attr_group = { | |
362 | .attrs = chp_attrs, | |
363 | }; | |
364 | ||
365 | static void chp_release(struct device *dev) | |
366 | { | |
367 | struct channel_path *cp; | |
368 | ||
05469607 | 369 | cp = to_channelpath(dev); |
e6b6e10a PO |
370 | kfree(cp); |
371 | } | |
372 | ||
373 | /** | |
374 | * chp_new - register a new channel-path | |
375 | * @chpid - channel-path ID | |
376 | * | |
377 | * Create and register data structure representing new channel-path. Return | |
378 | * zero on success, non-zero otherwise. | |
379 | */ | |
380 | int chp_new(struct chp_id chpid) | |
381 | { | |
382 | struct channel_path *chp; | |
383 | int ret; | |
384 | ||
e5854a58 PO |
385 | if (chp_is_registered(chpid)) |
386 | return 0; | |
e6b6e10a PO |
387 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
388 | if (!chp) | |
389 | return -ENOMEM; | |
390 | ||
391 | /* fill in status, etc. */ | |
392 | chp->chpid = chpid; | |
393 | chp->state = 1; | |
7c9f4e3a | 394 | chp->dev.parent = &channel_subsystems[chpid.cssid]->device; |
e6b6e10a | 395 | chp->dev.release = chp_release; |
1bf5b285 | 396 | dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); |
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 | } | |
414 | ||
415 | /* make it known to the system */ | |
416 | ret = device_register(&chp->dev); | |
417 | if (ret) { | |
e556bbbd CH |
418 | CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
419 | chpid.cssid, chpid.id, ret); | |
e6b6e10a PO |
420 | goto out_free; |
421 | } | |
422 | ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group); | |
423 | if (ret) { | |
424 | device_unregister(&chp->dev); | |
a2164b81 | 425 | goto out; |
e6b6e10a | 426 | } |
7c9f4e3a CH |
427 | mutex_lock(&channel_subsystems[chpid.cssid]->mutex); |
428 | if (channel_subsystems[chpid.cssid]->cm_enabled) { | |
e6b6e10a PO |
429 | ret = chp_add_cmg_attr(chp); |
430 | if (ret) { | |
431 | sysfs_remove_group(&chp->dev.kobj, &chp_attr_group); | |
432 | device_unregister(&chp->dev); | |
7c9f4e3a | 433 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); |
a2164b81 | 434 | goto out; |
e6b6e10a PO |
435 | } |
436 | } | |
7c9f4e3a CH |
437 | channel_subsystems[chpid.cssid]->chps[chpid.id] = chp; |
438 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); | |
a2164b81 | 439 | goto out; |
e6b6e10a PO |
440 | out_free: |
441 | kfree(chp); | |
a2164b81 | 442 | out: |
e6b6e10a PO |
443 | return ret; |
444 | } | |
445 | ||
446 | /** | |
447 | * chp_get_chp_desc - return newly allocated channel-path description | |
448 | * @chpid: channel-path ID | |
449 | * | |
450 | * On success return a newly allocated copy of the channel-path description | |
451 | * data associated with the given channel-path ID. Return %NULL on error. | |
452 | */ | |
453 | void *chp_get_chp_desc(struct chp_id chpid) | |
454 | { | |
455 | struct channel_path *chp; | |
456 | struct channel_path_desc *desc; | |
457 | ||
458 | chp = chpid_to_chp(chpid); | |
459 | if (!chp) | |
460 | return NULL; | |
461 | desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); | |
462 | if (!desc) | |
463 | return NULL; | |
464 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); | |
465 | return desc; | |
466 | } | |
467 | ||
468 | /** | |
469 | * chp_process_crw - process channel-path status change | |
c1156189 CH |
470 | * @crw0: channel report-word to handler |
471 | * @crw1: second channel-report word (always NULL) | |
472 | * @overflow: crw overflow indication | |
e6b6e10a PO |
473 | * |
474 | * Handle channel-report-words indicating that the status of a channel-path | |
475 | * has changed. | |
476 | */ | |
c1156189 CH |
477 | static void chp_process_crw(struct crw *crw0, struct crw *crw1, |
478 | int overflow) | |
e6b6e10a PO |
479 | { |
480 | struct chp_id chpid; | |
481 | ||
c1156189 CH |
482 | if (overflow) { |
483 | css_schedule_eval_all(); | |
484 | return; | |
485 | } | |
486 | CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " | |
487 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
488 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
489 | crw0->erc, crw0->rsid); | |
490 | /* | |
491 | * Check for solicited machine checks. These are | |
492 | * created by reset channel path and need not be | |
493 | * handled here. | |
494 | */ | |
495 | if (crw0->slct) { | |
496 | CIO_CRW_EVENT(2, "solicited machine check for " | |
497 | "channel path %02X\n", crw0->rsid); | |
498 | return; | |
499 | } | |
e6b6e10a | 500 | chp_id_init(&chpid); |
c1156189 CH |
501 | chpid.id = crw0->rsid; |
502 | switch (crw0->erc) { | |
503 | case CRW_ERC_IPARM: /* Path has come. */ | |
e6b6e10a PO |
504 | if (!chp_is_registered(chpid)) |
505 | chp_new(chpid); | |
83b3370c | 506 | chsc_chp_online(chpid); |
c1156189 CH |
507 | break; |
508 | case CRW_ERC_PERRI: /* Path has gone. */ | |
509 | case CRW_ERC_PERRN: | |
e6b6e10a | 510 | chsc_chp_offline(chpid); |
c1156189 CH |
511 | break; |
512 | default: | |
513 | CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", | |
514 | crw0->erc); | |
515 | } | |
e6b6e10a | 516 | } |
e5854a58 | 517 | |
99611f87 | 518 | int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) |
c820de39 CH |
519 | { |
520 | int i; | |
521 | int mask; | |
522 | ||
523 | for (i = 0; i < 8; i++) { | |
524 | mask = 0x80 >> i; | |
525 | if (!(ssd->path_mask & mask)) | |
526 | continue; | |
99611f87 | 527 | if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) |
c820de39 CH |
528 | continue; |
529 | if ((ssd->fla_valid_mask & mask) && | |
99611f87 | 530 | ((ssd->fla[i] & link->fla_mask) != link->fla)) |
c820de39 CH |
531 | continue; |
532 | return mask; | |
533 | } | |
534 | return 0; | |
535 | } | |
536 | EXPORT_SYMBOL_GPL(chp_ssd_get_mask); | |
537 | ||
e5854a58 PO |
538 | static inline int info_bit_num(struct chp_id id) |
539 | { | |
540 | return id.id + id.cssid * (__MAX_CHPID + 1); | |
541 | } | |
542 | ||
543 | /* Force chp_info refresh on next call to info_validate(). */ | |
544 | static void info_expire(void) | |
545 | { | |
546 | mutex_lock(&info_lock); | |
547 | chp_info_expires = jiffies - 1; | |
548 | mutex_unlock(&info_lock); | |
549 | } | |
550 | ||
551 | /* Ensure that chp_info is up-to-date. */ | |
552 | static int info_update(void) | |
553 | { | |
554 | int rc; | |
555 | ||
556 | mutex_lock(&info_lock); | |
557 | rc = 0; | |
558 | if (time_after(jiffies, chp_info_expires)) { | |
559 | /* Data is too old, update. */ | |
560 | rc = sclp_chp_read_info(&chp_info); | |
561 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; | |
562 | } | |
563 | mutex_unlock(&info_lock); | |
564 | ||
565 | return rc; | |
566 | } | |
567 | ||
568 | /** | |
569 | * chp_info_get_status - retrieve configure status of a channel-path | |
570 | * @chpid: channel-path ID | |
571 | * | |
572 | * On success, return 0 for standby, 1 for configured, 2 for reserved, | |
573 | * 3 for not recognized. Return negative error code on error. | |
574 | */ | |
575 | int chp_info_get_status(struct chp_id chpid) | |
576 | { | |
577 | int rc; | |
578 | int bit; | |
579 | ||
580 | rc = info_update(); | |
581 | if (rc) | |
582 | return rc; | |
583 | ||
584 | bit = info_bit_num(chpid); | |
585 | mutex_lock(&info_lock); | |
586 | if (!chp_test_bit(chp_info.recognized, bit)) | |
587 | rc = CHP_STATUS_NOT_RECOGNIZED; | |
588 | else if (chp_test_bit(chp_info.configured, bit)) | |
589 | rc = CHP_STATUS_CONFIGURED; | |
590 | else if (chp_test_bit(chp_info.standby, bit)) | |
591 | rc = CHP_STATUS_STANDBY; | |
592 | else | |
593 | rc = CHP_STATUS_RESERVED; | |
594 | mutex_unlock(&info_lock); | |
595 | ||
596 | return rc; | |
597 | } | |
598 | ||
599 | /* Return configure task for chpid. */ | |
600 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) | |
601 | { | |
602 | return chp_cfg_task[chpid.cssid][chpid.id]; | |
603 | } | |
604 | ||
605 | /* Set configure task for chpid. */ | |
606 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) | |
607 | { | |
608 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; | |
609 | } | |
610 | ||
611 | /* Perform one configure/deconfigure request. Reschedule work function until | |
612 | * last request. */ | |
613 | static void cfg_func(struct work_struct *work) | |
614 | { | |
615 | struct chp_id chpid; | |
616 | enum cfg_task_t t; | |
683c5418 | 617 | int rc; |
e5854a58 PO |
618 | |
619 | mutex_lock(&cfg_lock); | |
620 | t = cfg_none; | |
621 | chp_id_for_each(&chpid) { | |
622 | t = cfg_get_task(chpid); | |
623 | if (t != cfg_none) { | |
624 | cfg_set_task(chpid, cfg_none); | |
625 | break; | |
626 | } | |
627 | } | |
628 | mutex_unlock(&cfg_lock); | |
629 | ||
630 | switch (t) { | |
631 | case cfg_configure: | |
683c5418 PO |
632 | rc = sclp_chp_configure(chpid); |
633 | if (rc) | |
634 | CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" | |
635 | "%d\n", chpid.cssid, chpid.id, rc); | |
636 | else { | |
637 | info_expire(); | |
638 | chsc_chp_online(chpid); | |
639 | } | |
e5854a58 PO |
640 | break; |
641 | case cfg_deconfigure: | |
683c5418 PO |
642 | rc = sclp_chp_deconfigure(chpid); |
643 | if (rc) | |
644 | CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" | |
645 | "%d\n", chpid.cssid, chpid.id, rc); | |
646 | else { | |
647 | info_expire(); | |
648 | chsc_chp_offline(chpid); | |
649 | } | |
e5854a58 PO |
650 | break; |
651 | case cfg_none: | |
652 | /* Get updated information after last change. */ | |
653 | info_update(); | |
654 | mutex_lock(&cfg_lock); | |
655 | cfg_busy = 0; | |
656 | mutex_unlock(&cfg_lock); | |
657 | wake_up_interruptible(&cfg_wait_queue); | |
658 | return; | |
659 | } | |
660 | queue_work(chp_wq, &cfg_work); | |
661 | } | |
662 | ||
663 | /** | |
664 | * chp_cfg_schedule - schedule chpid configuration request | |
665 | * @chpid - channel-path ID | |
666 | * @configure - Non-zero for configure, zero for deconfigure | |
667 | * | |
668 | * Schedule a channel-path configuration/deconfiguration request. | |
669 | */ | |
670 | void chp_cfg_schedule(struct chp_id chpid, int configure) | |
671 | { | |
672 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, | |
673 | configure); | |
674 | mutex_lock(&cfg_lock); | |
675 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); | |
676 | cfg_busy = 1; | |
677 | mutex_unlock(&cfg_lock); | |
678 | queue_work(chp_wq, &cfg_work); | |
679 | } | |
680 | ||
681 | /** | |
682 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request | |
683 | * @chpid - channel-path ID | |
684 | * | |
685 | * Cancel an active channel-path deconfiguration request if it has not yet | |
686 | * been performed. | |
687 | */ | |
688 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) | |
689 | { | |
690 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); | |
691 | mutex_lock(&cfg_lock); | |
692 | if (cfg_get_task(chpid) == cfg_deconfigure) | |
693 | cfg_set_task(chpid, cfg_none); | |
694 | mutex_unlock(&cfg_lock); | |
695 | } | |
696 | ||
697 | static int cfg_wait_idle(void) | |
698 | { | |
699 | if (wait_event_interruptible(cfg_wait_queue, !cfg_busy)) | |
700 | return -ERESTARTSYS; | |
701 | return 0; | |
702 | } | |
703 | ||
704 | static int __init chp_init(void) | |
705 | { | |
706 | struct chp_id chpid; | |
c1156189 | 707 | int ret; |
e5854a58 | 708 | |
c1156189 CH |
709 | ret = s390_register_crw_handler(CRW_RSC_CPATH, chp_process_crw); |
710 | if (ret) | |
711 | return ret; | |
e5854a58 | 712 | chp_wq = create_singlethread_workqueue("cio_chp"); |
c1156189 CH |
713 | if (!chp_wq) { |
714 | s390_unregister_crw_handler(CRW_RSC_CPATH); | |
e5854a58 | 715 | return -ENOMEM; |
c1156189 | 716 | } |
e5854a58 PO |
717 | INIT_WORK(&cfg_work, cfg_func); |
718 | init_waitqueue_head(&cfg_wait_queue); | |
719 | if (info_update()) | |
720 | return 0; | |
721 | /* Register available channel-paths. */ | |
722 | chp_id_for_each(&chpid) { | |
723 | if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED) | |
724 | chp_new(chpid); | |
725 | } | |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
730 | subsys_initcall(chp_init); |