Commit | Line | Data |
---|---|---|
e6b6e10a | 1 | /* |
a53c8fab | 2 | * Copyright IBM Corp. 1999, 2010 |
e6b6e10a PO |
3 | * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) |
4 | * Arnd Bergmann (arndb@de.ibm.com) | |
5 | * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | |
6 | */ | |
7 | ||
8 | #include <linux/bug.h> | |
9 | #include <linux/workqueue.h> | |
10 | #include <linux/spinlock.h> | |
3a4c5d59 HC |
11 | #include <linux/export.h> |
12 | #include <linux/sched.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47 | /* Time after which channel-path status may be outdated.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 | 56 | |
e6b6e10a PO |
57 | /* Set vary state for given chpid. */ |
58 | static void set_chp_logically_online(struct chp_id chpid, int onoff) | |
59 | { | |
60 | chpid_to_chp(chpid)->state = onoff; | |
61 | } | |
62 | ||
af901ca1 | 63 | /* On success return 0 if channel-path is varied offline, 1 if it is varied |
e6b6e10a PO |
64 | * online. Return -ENODEV if channel-path is not registered. */ |
65 | int chp_get_status(struct chp_id chpid) | |
66 | { | |
67 | return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); | |
68 | } | |
69 | ||
70 | /** | |
71 | * chp_get_sch_opm - return opm for subchannel | |
72 | * @sch: subchannel | |
73 | * | |
74 | * Calculate and return the operational path mask (opm) based on the chpids | |
75 | * used by the subchannel and the status of the associated channel-paths. | |
76 | */ | |
77 | u8 chp_get_sch_opm(struct subchannel *sch) | |
78 | { | |
79 | struct chp_id chpid; | |
80 | int opm; | |
81 | int i; | |
82 | ||
83 | opm = 0; | |
84 | chp_id_init(&chpid); | |
a0ea22c3 | 85 | for (i = 0; i < 8; i++) { |
e6b6e10a PO |
86 | opm <<= 1; |
87 | chpid.id = sch->schib.pmcw.chpid[i]; | |
88 | if (chp_get_status(chpid) != 0) | |
89 | opm |= 1; | |
90 | } | |
91 | return opm; | |
92 | } | |
44a1c19e | 93 | EXPORT_SYMBOL_GPL(chp_get_sch_opm); |
e6b6e10a PO |
94 | |
95 | /** | |
96 | * chp_is_registered - check if a channel-path is registered | |
97 | * @chpid: channel-path ID | |
98 | * | |
99 | * Return non-zero if a channel-path with the given chpid is registered, | |
100 | * zero otherwise. | |
101 | */ | |
102 | int chp_is_registered(struct chp_id chpid) | |
103 | { | |
104 | return chpid_to_chp(chpid) != NULL; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Function: s390_vary_chpid | |
109 | * Varies the specified chpid online or offline | |
110 | */ | |
111 | static int s390_vary_chpid(struct chp_id chpid, int on) | |
112 | { | |
113 | char dbf_text[15]; | |
114 | int status; | |
115 | ||
116 | sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, | |
117 | chpid.id); | |
a0ea22c3 | 118 | CIO_TRACE_EVENT(2, dbf_text); |
e6b6e10a PO |
119 | |
120 | status = chp_get_status(chpid); | |
c78aa6cb ME |
121 | if (!on && !status) |
122 | return 0; | |
e6b6e10a PO |
123 | |
124 | set_chp_logically_online(chpid, on); | |
125 | chsc_chp_vary(chpid, on); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Channel measurement related functions | |
131 | */ | |
2c3c8bea CW |
132 | static ssize_t chp_measurement_chars_read(struct file *filp, |
133 | struct kobject *kobj, | |
91a69029 ZR |
134 | struct bin_attribute *bin_attr, |
135 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
136 | { |
137 | struct channel_path *chp; | |
364c8558 | 138 | struct device *device; |
e6b6e10a | 139 | |
364c8558 HC |
140 | device = container_of(kobj, struct device, kobj); |
141 | chp = to_channelpath(device); | |
e6b6e10a PO |
142 | if (!chp->cmg_chars) |
143 | return 0; | |
144 | ||
d9cef21a AM |
145 | return memory_read_from_buffer(buf, count, &off, |
146 | chp->cmg_chars, sizeof(struct cmg_chars)); | |
e6b6e10a PO |
147 | } |
148 | ||
149 | static struct bin_attribute chp_measurement_chars_attr = { | |
150 | .attr = { | |
151 | .name = "measurement_chars", | |
152 | .mode = S_IRUSR, | |
e6b6e10a PO |
153 | }, |
154 | .size = sizeof(struct cmg_chars), | |
155 | .read = chp_measurement_chars_read, | |
156 | }; | |
157 | ||
158 | static void chp_measurement_copy_block(struct cmg_entry *buf, | |
159 | struct channel_subsystem *css, | |
160 | struct chp_id chpid) | |
161 | { | |
162 | void *area; | |
163 | struct cmg_entry *entry, reference_buf; | |
164 | int idx; | |
165 | ||
166 | if (chpid.id < 128) { | |
167 | area = css->cub_addr1; | |
168 | idx = chpid.id; | |
169 | } else { | |
170 | area = css->cub_addr2; | |
171 | idx = chpid.id - 128; | |
172 | } | |
173 | entry = area + (idx * sizeof(struct cmg_entry)); | |
174 | do { | |
175 | memcpy(buf, entry, sizeof(*entry)); | |
176 | memcpy(&reference_buf, entry, sizeof(*entry)); | |
177 | } while (reference_buf.values[0] != buf->values[0]); | |
178 | } | |
179 | ||
2c3c8bea | 180 | static ssize_t chp_measurement_read(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
181 | struct bin_attribute *bin_attr, |
182 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
183 | { |
184 | struct channel_path *chp; | |
185 | struct channel_subsystem *css; | |
364c8558 | 186 | struct device *device; |
e6b6e10a PO |
187 | unsigned int size; |
188 | ||
364c8558 HC |
189 | device = container_of(kobj, struct device, kobj); |
190 | chp = to_channelpath(device); | |
e6b6e10a PO |
191 | css = to_css(chp->dev.parent); |
192 | ||
193 | size = sizeof(struct cmg_entry); | |
194 | ||
195 | /* Only allow single reads. */ | |
196 | if (off || count < size) | |
197 | return 0; | |
198 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); | |
199 | count = size; | |
200 | return count; | |
201 | } | |
202 | ||
203 | static struct bin_attribute chp_measurement_attr = { | |
204 | .attr = { | |
205 | .name = "measurement", | |
206 | .mode = S_IRUSR, | |
e6b6e10a PO |
207 | }, |
208 | .size = sizeof(struct cmg_entry), | |
209 | .read = chp_measurement_read, | |
210 | }; | |
211 | ||
212 | void chp_remove_cmg_attr(struct channel_path *chp) | |
213 | { | |
214 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
215 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); | |
216 | } | |
217 | ||
218 | int chp_add_cmg_attr(struct channel_path *chp) | |
219 | { | |
220 | int ret; | |
221 | ||
222 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
223 | if (ret) | |
224 | return ret; | |
225 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); | |
226 | if (ret) | |
227 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
228 | return ret; | |
229 | } | |
230 | ||
231 | /* | |
232 | * Files for the channel path entries. | |
233 | */ | |
234 | static ssize_t chp_status_show(struct device *dev, | |
235 | struct device_attribute *attr, char *buf) | |
236 | { | |
05469607 | 237 | struct channel_path *chp = to_channelpath(dev); |
b730f3a9 | 238 | int status; |
e6b6e10a | 239 | |
b730f3a9 SO |
240 | mutex_lock(&chp->lock); |
241 | status = chp->state; | |
242 | mutex_unlock(&chp->lock); | |
243 | ||
244 | return status ? sprintf(buf, "online\n") : sprintf(buf, "offline\n"); | |
e6b6e10a PO |
245 | } |
246 | ||
247 | static ssize_t chp_status_write(struct device *dev, | |
248 | struct device_attribute *attr, | |
249 | const char *buf, size_t count) | |
250 | { | |
05469607 | 251 | struct channel_path *cp = to_channelpath(dev); |
e6b6e10a PO |
252 | char cmd[10]; |
253 | int num_args; | |
254 | int error; | |
255 | ||
256 | num_args = sscanf(buf, "%5s", cmd); | |
257 | if (!num_args) | |
258 | return count; | |
259 | ||
b730f3a9 SO |
260 | if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) { |
261 | mutex_lock(&cp->lock); | |
e6b6e10a | 262 | error = s390_vary_chpid(cp->chpid, 1); |
b730f3a9 SO |
263 | mutex_unlock(&cp->lock); |
264 | } else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) { | |
265 | mutex_lock(&cp->lock); | |
e6b6e10a | 266 | error = s390_vary_chpid(cp->chpid, 0); |
b730f3a9 SO |
267 | mutex_unlock(&cp->lock); |
268 | } else | |
e6b6e10a PO |
269 | error = -EINVAL; |
270 | ||
271 | return error < 0 ? error : count; | |
e6b6e10a PO |
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); |
b730f3a9 | 317 | u8 type; |
e6b6e10a | 318 | |
b730f3a9 SO |
319 | mutex_lock(&chp->lock); |
320 | type = chp->desc.desc; | |
321 | mutex_unlock(&chp->lock); | |
322 | return sprintf(buf, "%x\n", type); | |
e6b6e10a PO |
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 | }; | |
e6b6e10a PO |
363 | static struct attribute_group chp_attr_group = { |
364 | .attrs = chp_attrs, | |
365 | }; | |
ed35ba9a SO |
366 | static const struct attribute_group *chp_attr_groups[] = { |
367 | &chp_attr_group, | |
368 | NULL, | |
369 | }; | |
e6b6e10a PO |
370 | |
371 | static void chp_release(struct device *dev) | |
372 | { | |
373 | struct channel_path *cp; | |
374 | ||
05469607 | 375 | cp = to_channelpath(dev); |
e6b6e10a PO |
376 | kfree(cp); |
377 | } | |
378 | ||
379 | /** | |
380 | * chp_new - register a new channel-path | |
381 | * @chpid - channel-path ID | |
382 | * | |
383 | * Create and register data structure representing new channel-path. Return | |
384 | * zero on success, non-zero otherwise. | |
385 | */ | |
386 | int chp_new(struct chp_id chpid) | |
387 | { | |
388 | struct channel_path *chp; | |
389 | int ret; | |
390 | ||
e5854a58 PO |
391 | if (chp_is_registered(chpid)) |
392 | return 0; | |
e6b6e10a PO |
393 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
394 | if (!chp) | |
395 | return -ENOMEM; | |
396 | ||
397 | /* fill in status, etc. */ | |
398 | chp->chpid = chpid; | |
399 | chp->state = 1; | |
7c9f4e3a | 400 | chp->dev.parent = &channel_subsystems[chpid.cssid]->device; |
ed35ba9a | 401 | chp->dev.groups = chp_attr_groups; |
e6b6e10a | 402 | chp->dev.release = chp_release; |
b730f3a9 | 403 | mutex_init(&chp->lock); |
e6b6e10a PO |
404 | |
405 | /* Obtain channel path description and fill it in. */ | |
9d92a7e1 | 406 | ret = chsc_determine_base_channel_path_desc(chpid, &chp->desc); |
e6b6e10a PO |
407 | if (ret) |
408 | goto out_free; | |
c9182e0f PO |
409 | if ((chp->desc.flags & 0x80) == 0) { |
410 | ret = -ENODEV; | |
411 | goto out_free; | |
412 | } | |
e6b6e10a | 413 | /* Get channel-measurement characteristics. */ |
75784c00 | 414 | if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) { |
e6b6e10a PO |
415 | ret = chsc_get_channel_measurement_chars(chp); |
416 | if (ret) | |
417 | goto out_free; | |
418 | } else { | |
e6b6e10a PO |
419 | chp->cmg = -1; |
420 | } | |
ec004407 | 421 | dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); |
e6b6e10a PO |
422 | |
423 | /* make it known to the system */ | |
424 | ret = device_register(&chp->dev); | |
425 | if (ret) { | |
e556bbbd CH |
426 | CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
427 | chpid.cssid, chpid.id, ret); | |
c6304933 SO |
428 | put_device(&chp->dev); |
429 | goto out; | |
e6b6e10a | 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) { | |
e6b6e10a | 435 | device_unregister(&chp->dev); |
7c9f4e3a | 436 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); |
a2164b81 | 437 | goto out; |
e6b6e10a PO |
438 | } |
439 | } | |
7c9f4e3a CH |
440 | channel_subsystems[chpid.cssid]->chps[chpid.id] = chp; |
441 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); | |
a2164b81 | 442 | goto out; |
e6b6e10a PO |
443 | out_free: |
444 | kfree(chp); | |
a2164b81 | 445 | out: |
e6b6e10a PO |
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; | |
b730f3a9 SO |
467 | |
468 | mutex_lock(&chp->lock); | |
e6b6e10a | 469 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); |
b730f3a9 | 470 | mutex_unlock(&chp->lock); |
e6b6e10a PO |
471 | return desc; |
472 | } | |
473 | ||
474 | /** | |
475 | * chp_process_crw - process channel-path status change | |
c1156189 CH |
476 | * @crw0: channel report-word to handler |
477 | * @crw1: second channel-report word (always NULL) | |
478 | * @overflow: crw overflow indication | |
e6b6e10a PO |
479 | * |
480 | * Handle channel-report-words indicating that the status of a channel-path | |
481 | * has changed. | |
482 | */ | |
c1156189 CH |
483 | static void chp_process_crw(struct crw *crw0, struct crw *crw1, |
484 | int overflow) | |
e6b6e10a PO |
485 | { |
486 | struct chp_id chpid; | |
487 | ||
c1156189 CH |
488 | if (overflow) { |
489 | css_schedule_eval_all(); | |
490 | return; | |
491 | } | |
492 | CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " | |
493 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
494 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
495 | crw0->erc, crw0->rsid); | |
496 | /* | |
497 | * Check for solicited machine checks. These are | |
498 | * created by reset channel path and need not be | |
499 | * handled here. | |
500 | */ | |
501 | if (crw0->slct) { | |
502 | CIO_CRW_EVENT(2, "solicited machine check for " | |
503 | "channel path %02X\n", crw0->rsid); | |
504 | return; | |
505 | } | |
e6b6e10a | 506 | chp_id_init(&chpid); |
c1156189 CH |
507 | chpid.id = crw0->rsid; |
508 | switch (crw0->erc) { | |
509 | case CRW_ERC_IPARM: /* Path has come. */ | |
e6b6e10a PO |
510 | if (!chp_is_registered(chpid)) |
511 | chp_new(chpid); | |
83b3370c | 512 | chsc_chp_online(chpid); |
c1156189 CH |
513 | break; |
514 | case CRW_ERC_PERRI: /* Path has gone. */ | |
515 | case CRW_ERC_PERRN: | |
e6b6e10a | 516 | chsc_chp_offline(chpid); |
c1156189 CH |
517 | break; |
518 | default: | |
519 | CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", | |
520 | crw0->erc); | |
521 | } | |
e6b6e10a | 522 | } |
e5854a58 | 523 | |
99611f87 | 524 | int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) |
c820de39 CH |
525 | { |
526 | int i; | |
527 | int mask; | |
528 | ||
529 | for (i = 0; i < 8; i++) { | |
530 | mask = 0x80 >> i; | |
531 | if (!(ssd->path_mask & mask)) | |
532 | continue; | |
99611f87 | 533 | if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) |
c820de39 CH |
534 | continue; |
535 | if ((ssd->fla_valid_mask & mask) && | |
99611f87 | 536 | ((ssd->fla[i] & link->fla_mask) != link->fla)) |
c820de39 CH |
537 | continue; |
538 | return mask; | |
539 | } | |
540 | return 0; | |
541 | } | |
542 | EXPORT_SYMBOL_GPL(chp_ssd_get_mask); | |
543 | ||
e5854a58 PO |
544 | static inline int info_bit_num(struct chp_id id) |
545 | { | |
546 | return id.id + id.cssid * (__MAX_CHPID + 1); | |
547 | } | |
548 | ||
549 | /* Force chp_info refresh on next call to info_validate(). */ | |
550 | static void info_expire(void) | |
551 | { | |
552 | mutex_lock(&info_lock); | |
553 | chp_info_expires = jiffies - 1; | |
554 | mutex_unlock(&info_lock); | |
555 | } | |
556 | ||
557 | /* Ensure that chp_info is up-to-date. */ | |
558 | static int info_update(void) | |
559 | { | |
560 | int rc; | |
561 | ||
562 | mutex_lock(&info_lock); | |
563 | rc = 0; | |
564 | if (time_after(jiffies, chp_info_expires)) { | |
565 | /* Data is too old, update. */ | |
566 | rc = sclp_chp_read_info(&chp_info); | |
567 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; | |
568 | } | |
569 | mutex_unlock(&info_lock); | |
570 | ||
571 | return rc; | |
572 | } | |
573 | ||
574 | /** | |
575 | * chp_info_get_status - retrieve configure status of a channel-path | |
576 | * @chpid: channel-path ID | |
577 | * | |
578 | * On success, return 0 for standby, 1 for configured, 2 for reserved, | |
579 | * 3 for not recognized. Return negative error code on error. | |
580 | */ | |
581 | int chp_info_get_status(struct chp_id chpid) | |
582 | { | |
583 | int rc; | |
584 | int bit; | |
585 | ||
586 | rc = info_update(); | |
587 | if (rc) | |
588 | return rc; | |
589 | ||
590 | bit = info_bit_num(chpid); | |
591 | mutex_lock(&info_lock); | |
592 | if (!chp_test_bit(chp_info.recognized, bit)) | |
593 | rc = CHP_STATUS_NOT_RECOGNIZED; | |
594 | else if (chp_test_bit(chp_info.configured, bit)) | |
595 | rc = CHP_STATUS_CONFIGURED; | |
596 | else if (chp_test_bit(chp_info.standby, bit)) | |
597 | rc = CHP_STATUS_STANDBY; | |
598 | else | |
599 | rc = CHP_STATUS_RESERVED; | |
600 | mutex_unlock(&info_lock); | |
601 | ||
602 | return rc; | |
603 | } | |
604 | ||
605 | /* Return configure task for chpid. */ | |
606 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) | |
607 | { | |
608 | return chp_cfg_task[chpid.cssid][chpid.id]; | |
609 | } | |
610 | ||
611 | /* Set configure task for chpid. */ | |
612 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) | |
613 | { | |
614 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; | |
615 | } | |
616 | ||
617 | /* Perform one configure/deconfigure request. Reschedule work function until | |
618 | * last request. */ | |
619 | static void cfg_func(struct work_struct *work) | |
620 | { | |
621 | struct chp_id chpid; | |
622 | enum cfg_task_t t; | |
683c5418 | 623 | int rc; |
e5854a58 PO |
624 | |
625 | mutex_lock(&cfg_lock); | |
626 | t = cfg_none; | |
627 | chp_id_for_each(&chpid) { | |
628 | t = cfg_get_task(chpid); | |
629 | if (t != cfg_none) { | |
630 | cfg_set_task(chpid, cfg_none); | |
631 | break; | |
632 | } | |
633 | } | |
634 | mutex_unlock(&cfg_lock); | |
635 | ||
636 | switch (t) { | |
637 | case cfg_configure: | |
683c5418 PO |
638 | rc = sclp_chp_configure(chpid); |
639 | if (rc) | |
640 | CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" | |
641 | "%d\n", chpid.cssid, chpid.id, rc); | |
642 | else { | |
643 | info_expire(); | |
644 | chsc_chp_online(chpid); | |
645 | } | |
e5854a58 PO |
646 | break; |
647 | case cfg_deconfigure: | |
683c5418 PO |
648 | rc = sclp_chp_deconfigure(chpid); |
649 | if (rc) | |
650 | CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" | |
651 | "%d\n", chpid.cssid, chpid.id, rc); | |
652 | else { | |
653 | info_expire(); | |
654 | chsc_chp_offline(chpid); | |
655 | } | |
e5854a58 PO |
656 | break; |
657 | case cfg_none: | |
658 | /* Get updated information after last change. */ | |
659 | info_update(); | |
660 | mutex_lock(&cfg_lock); | |
661 | cfg_busy = 0; | |
662 | mutex_unlock(&cfg_lock); | |
663 | wake_up_interruptible(&cfg_wait_queue); | |
664 | return; | |
665 | } | |
666 | queue_work(chp_wq, &cfg_work); | |
667 | } | |
668 | ||
669 | /** | |
670 | * chp_cfg_schedule - schedule chpid configuration request | |
671 | * @chpid - channel-path ID | |
672 | * @configure - Non-zero for configure, zero for deconfigure | |
673 | * | |
674 | * Schedule a channel-path configuration/deconfiguration request. | |
675 | */ | |
676 | void chp_cfg_schedule(struct chp_id chpid, int configure) | |
677 | { | |
678 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, | |
679 | configure); | |
680 | mutex_lock(&cfg_lock); | |
681 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); | |
682 | cfg_busy = 1; | |
683 | mutex_unlock(&cfg_lock); | |
684 | queue_work(chp_wq, &cfg_work); | |
685 | } | |
686 | ||
687 | /** | |
688 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request | |
689 | * @chpid - channel-path ID | |
690 | * | |
691 | * Cancel an active channel-path deconfiguration request if it has not yet | |
692 | * been performed. | |
693 | */ | |
694 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) | |
695 | { | |
696 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); | |
697 | mutex_lock(&cfg_lock); | |
698 | if (cfg_get_task(chpid) == cfg_deconfigure) | |
699 | cfg_set_task(chpid, cfg_none); | |
700 | mutex_unlock(&cfg_lock); | |
701 | } | |
702 | ||
703 | static int cfg_wait_idle(void) | |
704 | { | |
705 | if (wait_event_interruptible(cfg_wait_queue, !cfg_busy)) | |
706 | return -ERESTARTSYS; | |
707 | return 0; | |
708 | } | |
709 | ||
710 | static int __init chp_init(void) | |
711 | { | |
712 | struct chp_id chpid; | |
c1156189 | 713 | int ret; |
e5854a58 | 714 | |
f5daba1d | 715 | ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); |
c1156189 CH |
716 | if (ret) |
717 | return ret; | |
e5854a58 | 718 | chp_wq = create_singlethread_workqueue("cio_chp"); |
c1156189 | 719 | if (!chp_wq) { |
f5daba1d | 720 | crw_unregister_handler(CRW_RSC_CPATH); |
e5854a58 | 721 | return -ENOMEM; |
c1156189 | 722 | } |
e5854a58 PO |
723 | INIT_WORK(&cfg_work, cfg_func); |
724 | init_waitqueue_head(&cfg_wait_queue); | |
725 | if (info_update()) | |
726 | return 0; | |
727 | /* Register available channel-paths. */ | |
728 | chp_id_for_each(&chpid) { | |
729 | if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED) | |
730 | chp_new(chpid); | |
731 | } | |
732 | ||
733 | return 0; | |
734 | } | |
735 | ||
736 | subsys_initcall(chp_init); |