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Commit | Line | Data |
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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]; | |
837c5220 | 40 | static DEFINE_SPINLOCK(cfg_lock); |
e5854a58 PO |
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46 | /* Time after which channel-path status may be outdated.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 | ||
e5854a58 PO |
49 | static struct work_struct cfg_work; |
50 | ||
51 | /* Wait queue for configure completion events. */ | |
52 | static wait_queue_head_t cfg_wait_queue; | |
e6b6e10a | 53 | |
e6b6e10a PO |
54 | /* Set vary state for given chpid. */ |
55 | static void set_chp_logically_online(struct chp_id chpid, int onoff) | |
56 | { | |
57 | chpid_to_chp(chpid)->state = onoff; | |
58 | } | |
59 | ||
af901ca1 | 60 | /* On success return 0 if channel-path is varied offline, 1 if it is varied |
e6b6e10a PO |
61 | * online. Return -ENODEV if channel-path is not registered. */ |
62 | int chp_get_status(struct chp_id chpid) | |
63 | { | |
64 | return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); | |
65 | } | |
66 | ||
67 | /** | |
68 | * chp_get_sch_opm - return opm for subchannel | |
69 | * @sch: subchannel | |
70 | * | |
71 | * Calculate and return the operational path mask (opm) based on the chpids | |
72 | * used by the subchannel and the status of the associated channel-paths. | |
73 | */ | |
74 | u8 chp_get_sch_opm(struct subchannel *sch) | |
75 | { | |
76 | struct chp_id chpid; | |
77 | int opm; | |
78 | int i; | |
79 | ||
80 | opm = 0; | |
81 | chp_id_init(&chpid); | |
a0ea22c3 | 82 | for (i = 0; i < 8; i++) { |
e6b6e10a PO |
83 | opm <<= 1; |
84 | chpid.id = sch->schib.pmcw.chpid[i]; | |
85 | if (chp_get_status(chpid) != 0) | |
86 | opm |= 1; | |
87 | } | |
88 | return opm; | |
89 | } | |
44a1c19e | 90 | EXPORT_SYMBOL_GPL(chp_get_sch_opm); |
e6b6e10a PO |
91 | |
92 | /** | |
93 | * chp_is_registered - check if a channel-path is registered | |
94 | * @chpid: channel-path ID | |
95 | * | |
96 | * Return non-zero if a channel-path with the given chpid is registered, | |
97 | * zero otherwise. | |
98 | */ | |
99 | int chp_is_registered(struct chp_id chpid) | |
100 | { | |
101 | return chpid_to_chp(chpid) != NULL; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Function: s390_vary_chpid | |
106 | * Varies the specified chpid online or offline | |
107 | */ | |
108 | static int s390_vary_chpid(struct chp_id chpid, int on) | |
109 | { | |
110 | char dbf_text[15]; | |
111 | int status; | |
112 | ||
113 | sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, | |
114 | chpid.id); | |
a0ea22c3 | 115 | CIO_TRACE_EVENT(2, dbf_text); |
e6b6e10a PO |
116 | |
117 | status = chp_get_status(chpid); | |
c78aa6cb ME |
118 | if (!on && !status) |
119 | return 0; | |
e6b6e10a PO |
120 | |
121 | set_chp_logically_online(chpid, on); | |
122 | chsc_chp_vary(chpid, on); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | /* | |
127 | * Channel measurement related functions | |
128 | */ | |
2c3c8bea CW |
129 | static ssize_t chp_measurement_chars_read(struct file *filp, |
130 | struct kobject *kobj, | |
91a69029 ZR |
131 | struct bin_attribute *bin_attr, |
132 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
133 | { |
134 | struct channel_path *chp; | |
364c8558 | 135 | struct device *device; |
e6b6e10a | 136 | |
364c8558 HC |
137 | device = container_of(kobj, struct device, kobj); |
138 | chp = to_channelpath(device); | |
0d9bfe91 | 139 | if (chp->cmg == -1) |
e6b6e10a PO |
140 | return 0; |
141 | ||
0d9bfe91 SO |
142 | return memory_read_from_buffer(buf, count, &off, &chp->cmg_chars, |
143 | sizeof(chp->cmg_chars)); | |
e6b6e10a PO |
144 | } |
145 | ||
146 | static struct bin_attribute chp_measurement_chars_attr = { | |
147 | .attr = { | |
148 | .name = "measurement_chars", | |
149 | .mode = S_IRUSR, | |
e6b6e10a PO |
150 | }, |
151 | .size = sizeof(struct cmg_chars), | |
152 | .read = chp_measurement_chars_read, | |
153 | }; | |
154 | ||
155 | static void chp_measurement_copy_block(struct cmg_entry *buf, | |
156 | struct channel_subsystem *css, | |
157 | struct chp_id chpid) | |
158 | { | |
159 | void *area; | |
160 | struct cmg_entry *entry, reference_buf; | |
161 | int idx; | |
162 | ||
163 | if (chpid.id < 128) { | |
164 | area = css->cub_addr1; | |
165 | idx = chpid.id; | |
166 | } else { | |
167 | area = css->cub_addr2; | |
168 | idx = chpid.id - 128; | |
169 | } | |
170 | entry = area + (idx * sizeof(struct cmg_entry)); | |
171 | do { | |
172 | memcpy(buf, entry, sizeof(*entry)); | |
173 | memcpy(&reference_buf, entry, sizeof(*entry)); | |
174 | } while (reference_buf.values[0] != buf->values[0]); | |
175 | } | |
176 | ||
2c3c8bea | 177 | static ssize_t chp_measurement_read(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
178 | struct bin_attribute *bin_attr, |
179 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
180 | { |
181 | struct channel_path *chp; | |
182 | struct channel_subsystem *css; | |
364c8558 | 183 | struct device *device; |
e6b6e10a PO |
184 | unsigned int size; |
185 | ||
364c8558 HC |
186 | device = container_of(kobj, struct device, kobj); |
187 | chp = to_channelpath(device); | |
e6b6e10a PO |
188 | css = to_css(chp->dev.parent); |
189 | ||
190 | size = sizeof(struct cmg_entry); | |
191 | ||
192 | /* Only allow single reads. */ | |
193 | if (off || count < size) | |
194 | return 0; | |
195 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); | |
196 | count = size; | |
197 | return count; | |
198 | } | |
199 | ||
200 | static struct bin_attribute chp_measurement_attr = { | |
201 | .attr = { | |
202 | .name = "measurement", | |
203 | .mode = S_IRUSR, | |
e6b6e10a PO |
204 | }, |
205 | .size = sizeof(struct cmg_entry), | |
206 | .read = chp_measurement_read, | |
207 | }; | |
208 | ||
209 | void chp_remove_cmg_attr(struct channel_path *chp) | |
210 | { | |
211 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
212 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); | |
213 | } | |
214 | ||
215 | int chp_add_cmg_attr(struct channel_path *chp) | |
216 | { | |
217 | int ret; | |
218 | ||
219 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
220 | if (ret) | |
221 | return ret; | |
222 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); | |
223 | if (ret) | |
224 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
225 | return ret; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Files for the channel path entries. | |
230 | */ | |
231 | static ssize_t chp_status_show(struct device *dev, | |
232 | struct device_attribute *attr, char *buf) | |
233 | { | |
05469607 | 234 | struct channel_path *chp = to_channelpath(dev); |
b730f3a9 | 235 | int status; |
e6b6e10a | 236 | |
b730f3a9 SO |
237 | mutex_lock(&chp->lock); |
238 | status = chp->state; | |
239 | mutex_unlock(&chp->lock); | |
240 | ||
241 | return status ? sprintf(buf, "online\n") : sprintf(buf, "offline\n"); | |
e6b6e10a PO |
242 | } |
243 | ||
244 | static ssize_t chp_status_write(struct device *dev, | |
245 | struct device_attribute *attr, | |
246 | const char *buf, size_t count) | |
247 | { | |
05469607 | 248 | struct channel_path *cp = to_channelpath(dev); |
e6b6e10a PO |
249 | char cmd[10]; |
250 | int num_args; | |
251 | int error; | |
252 | ||
253 | num_args = sscanf(buf, "%5s", cmd); | |
254 | if (!num_args) | |
255 | return count; | |
256 | ||
3f8bfd9a | 257 | if (!strncasecmp(cmd, "on", 2) || !strcmp(cmd, "1")) { |
b730f3a9 | 258 | mutex_lock(&cp->lock); |
e6b6e10a | 259 | error = s390_vary_chpid(cp->chpid, 1); |
b730f3a9 | 260 | mutex_unlock(&cp->lock); |
3f8bfd9a | 261 | } else if (!strncasecmp(cmd, "off", 3) || !strcmp(cmd, "0")) { |
b730f3a9 | 262 | mutex_lock(&cp->lock); |
e6b6e10a | 263 | error = s390_vary_chpid(cp->chpid, 0); |
b730f3a9 SO |
264 | mutex_unlock(&cp->lock); |
265 | } else | |
e6b6e10a PO |
266 | error = -EINVAL; |
267 | ||
268 | return error < 0 ? error : count; | |
e6b6e10a PO |
269 | } |
270 | ||
271 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); | |
272 | ||
e5854a58 PO |
273 | static ssize_t chp_configure_show(struct device *dev, |
274 | struct device_attribute *attr, char *buf) | |
275 | { | |
276 | struct channel_path *cp; | |
277 | int status; | |
278 | ||
05469607 | 279 | cp = to_channelpath(dev); |
e5854a58 PO |
280 | status = chp_info_get_status(cp->chpid); |
281 | if (status < 0) | |
282 | return status; | |
283 | ||
284 | return snprintf(buf, PAGE_SIZE, "%d\n", status); | |
285 | } | |
286 | ||
287 | static int cfg_wait_idle(void); | |
288 | ||
289 | static ssize_t chp_configure_write(struct device *dev, | |
290 | struct device_attribute *attr, | |
291 | const char *buf, size_t count) | |
292 | { | |
293 | struct channel_path *cp; | |
294 | int val; | |
295 | char delim; | |
296 | ||
297 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
298 | return -EINVAL; | |
299 | if (val != 0 && val != 1) | |
300 | return -EINVAL; | |
05469607 | 301 | cp = to_channelpath(dev); |
e5854a58 PO |
302 | chp_cfg_schedule(cp->chpid, val); |
303 | cfg_wait_idle(); | |
304 | ||
305 | return count; | |
306 | } | |
307 | ||
308 | static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); | |
309 | ||
e6b6e10a PO |
310 | static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
311 | char *buf) | |
312 | { | |
05469607 | 313 | struct channel_path *chp = to_channelpath(dev); |
b730f3a9 | 314 | u8 type; |
e6b6e10a | 315 | |
b730f3a9 SO |
316 | mutex_lock(&chp->lock); |
317 | type = chp->desc.desc; | |
318 | mutex_unlock(&chp->lock); | |
319 | return sprintf(buf, "%x\n", type); | |
e6b6e10a PO |
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 | ||
ba54229d PO |
352 | static ssize_t chp_chid_show(struct device *dev, struct device_attribute *attr, |
353 | char *buf) | |
354 | { | |
355 | struct channel_path *chp = to_channelpath(dev); | |
356 | ssize_t rc; | |
357 | ||
358 | mutex_lock(&chp->lock); | |
359 | if (chp->desc_fmt1.flags & 0x10) | |
360 | rc = sprintf(buf, "%04x\n", chp->desc_fmt1.chid); | |
361 | else | |
362 | rc = 0; | |
363 | mutex_unlock(&chp->lock); | |
364 | ||
365 | return rc; | |
366 | } | |
367 | static DEVICE_ATTR(chid, 0444, chp_chid_show, NULL); | |
368 | ||
369 | static ssize_t chp_chid_external_show(struct device *dev, | |
370 | struct device_attribute *attr, char *buf) | |
371 | { | |
372 | struct channel_path *chp = to_channelpath(dev); | |
373 | ssize_t rc; | |
374 | ||
375 | mutex_lock(&chp->lock); | |
376 | if (chp->desc_fmt1.flags & 0x10) | |
377 | rc = sprintf(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0); | |
378 | else | |
379 | rc = 0; | |
380 | mutex_unlock(&chp->lock); | |
381 | ||
382 | return rc; | |
383 | } | |
384 | static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL); | |
385 | ||
a0ea22c3 | 386 | static struct attribute *chp_attrs[] = { |
e6b6e10a | 387 | &dev_attr_status.attr, |
e5854a58 | 388 | &dev_attr_configure.attr, |
e6b6e10a PO |
389 | &dev_attr_type.attr, |
390 | &dev_attr_cmg.attr, | |
391 | &dev_attr_shared.attr, | |
ba54229d PO |
392 | &dev_attr_chid.attr, |
393 | &dev_attr_chid_external.attr, | |
e6b6e10a PO |
394 | NULL, |
395 | }; | |
e6b6e10a PO |
396 | static struct attribute_group chp_attr_group = { |
397 | .attrs = chp_attrs, | |
398 | }; | |
ed35ba9a SO |
399 | static const struct attribute_group *chp_attr_groups[] = { |
400 | &chp_attr_group, | |
401 | NULL, | |
402 | }; | |
e6b6e10a PO |
403 | |
404 | static void chp_release(struct device *dev) | |
405 | { | |
406 | struct channel_path *cp; | |
407 | ||
05469607 | 408 | cp = to_channelpath(dev); |
e6b6e10a PO |
409 | kfree(cp); |
410 | } | |
411 | ||
cce0eacc PO |
412 | /** |
413 | * chp_update_desc - update channel-path description | |
414 | * @chp - channel-path | |
415 | * | |
9f3d6d7a SO |
416 | * Update the channel-path description of the specified channel-path |
417 | * including channel measurement related information. | |
cce0eacc PO |
418 | * Return zero on success, non-zero otherwise. |
419 | */ | |
420 | int chp_update_desc(struct channel_path *chp) | |
421 | { | |
422 | int rc; | |
423 | ||
424 | rc = chsc_determine_base_channel_path_desc(chp->chpid, &chp->desc); | |
425 | if (rc) | |
426 | return rc; | |
427 | ||
0b601373 SO |
428 | /* |
429 | * Fetching the following data is optional. Not all machines or | |
430 | * hypervisors implement the required chsc commands. | |
431 | */ | |
432 | chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1); | |
433 | chsc_get_channel_measurement_chars(chp); | |
cce0eacc | 434 | |
0b601373 | 435 | return 0; |
cce0eacc PO |
436 | } |
437 | ||
e6b6e10a PO |
438 | /** |
439 | * chp_new - register a new channel-path | |
440 | * @chpid - channel-path ID | |
441 | * | |
442 | * Create and register data structure representing new channel-path. Return | |
443 | * zero on success, non-zero otherwise. | |
444 | */ | |
445 | int chp_new(struct chp_id chpid) | |
446 | { | |
98cc43ab | 447 | struct channel_subsystem *css = css_by_id(chpid.cssid); |
e6b6e10a PO |
448 | struct channel_path *chp; |
449 | int ret; | |
450 | ||
e5854a58 PO |
451 | if (chp_is_registered(chpid)) |
452 | return 0; | |
e6b6e10a PO |
453 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
454 | if (!chp) | |
455 | return -ENOMEM; | |
456 | ||
457 | /* fill in status, etc. */ | |
458 | chp->chpid = chpid; | |
459 | chp->state = 1; | |
98cc43ab | 460 | chp->dev.parent = &css->device; |
ed35ba9a | 461 | chp->dev.groups = chp_attr_groups; |
e6b6e10a | 462 | chp->dev.release = chp_release; |
b730f3a9 | 463 | mutex_init(&chp->lock); |
e6b6e10a PO |
464 | |
465 | /* Obtain channel path description and fill it in. */ | |
cce0eacc | 466 | ret = chp_update_desc(chp); |
e6b6e10a PO |
467 | if (ret) |
468 | goto out_free; | |
c9182e0f PO |
469 | if ((chp->desc.flags & 0x80) == 0) { |
470 | ret = -ENODEV; | |
471 | goto out_free; | |
472 | } | |
ec004407 | 473 | dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); |
e6b6e10a PO |
474 | |
475 | /* make it known to the system */ | |
476 | ret = device_register(&chp->dev); | |
477 | if (ret) { | |
e556bbbd CH |
478 | CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
479 | chpid.cssid, chpid.id, ret); | |
c6304933 SO |
480 | put_device(&chp->dev); |
481 | goto out; | |
e6b6e10a | 482 | } |
98cc43ab SO |
483 | mutex_lock(&css->mutex); |
484 | if (css->cm_enabled) { | |
e6b6e10a PO |
485 | ret = chp_add_cmg_attr(chp); |
486 | if (ret) { | |
e6b6e10a | 487 | device_unregister(&chp->dev); |
98cc43ab | 488 | mutex_unlock(&css->mutex); |
a2164b81 | 489 | goto out; |
e6b6e10a PO |
490 | } |
491 | } | |
98cc43ab SO |
492 | css->chps[chpid.id] = chp; |
493 | mutex_unlock(&css->mutex); | |
a2164b81 | 494 | goto out; |
e6b6e10a PO |
495 | out_free: |
496 | kfree(chp); | |
a2164b81 | 497 | out: |
e6b6e10a PO |
498 | return ret; |
499 | } | |
500 | ||
501 | /** | |
502 | * chp_get_chp_desc - return newly allocated channel-path description | |
503 | * @chpid: channel-path ID | |
504 | * | |
505 | * On success return a newly allocated copy of the channel-path description | |
506 | * data associated with the given channel-path ID. Return %NULL on error. | |
507 | */ | |
2bf29df7 | 508 | struct channel_path_desc *chp_get_chp_desc(struct chp_id chpid) |
e6b6e10a PO |
509 | { |
510 | struct channel_path *chp; | |
511 | struct channel_path_desc *desc; | |
512 | ||
513 | chp = chpid_to_chp(chpid); | |
514 | if (!chp) | |
515 | return NULL; | |
516 | desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); | |
517 | if (!desc) | |
518 | return NULL; | |
b730f3a9 SO |
519 | |
520 | mutex_lock(&chp->lock); | |
e6b6e10a | 521 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); |
b730f3a9 | 522 | mutex_unlock(&chp->lock); |
e6b6e10a PO |
523 | return desc; |
524 | } | |
525 | ||
526 | /** | |
527 | * chp_process_crw - process channel-path status change | |
c1156189 CH |
528 | * @crw0: channel report-word to handler |
529 | * @crw1: second channel-report word (always NULL) | |
530 | * @overflow: crw overflow indication | |
e6b6e10a PO |
531 | * |
532 | * Handle channel-report-words indicating that the status of a channel-path | |
533 | * has changed. | |
534 | */ | |
c1156189 CH |
535 | static void chp_process_crw(struct crw *crw0, struct crw *crw1, |
536 | int overflow) | |
e6b6e10a PO |
537 | { |
538 | struct chp_id chpid; | |
539 | ||
c1156189 CH |
540 | if (overflow) { |
541 | css_schedule_eval_all(); | |
542 | return; | |
543 | } | |
544 | CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " | |
545 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
546 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
547 | crw0->erc, crw0->rsid); | |
548 | /* | |
549 | * Check for solicited machine checks. These are | |
550 | * created by reset channel path and need not be | |
551 | * handled here. | |
552 | */ | |
553 | if (crw0->slct) { | |
554 | CIO_CRW_EVENT(2, "solicited machine check for " | |
555 | "channel path %02X\n", crw0->rsid); | |
556 | return; | |
557 | } | |
e6b6e10a | 558 | chp_id_init(&chpid); |
c1156189 CH |
559 | chpid.id = crw0->rsid; |
560 | switch (crw0->erc) { | |
561 | case CRW_ERC_IPARM: /* Path has come. */ | |
2daace78 | 562 | case CRW_ERC_INIT: |
e6b6e10a PO |
563 | if (!chp_is_registered(chpid)) |
564 | chp_new(chpid); | |
83b3370c | 565 | chsc_chp_online(chpid); |
c1156189 CH |
566 | break; |
567 | case CRW_ERC_PERRI: /* Path has gone. */ | |
568 | case CRW_ERC_PERRN: | |
e6b6e10a | 569 | chsc_chp_offline(chpid); |
c1156189 CH |
570 | break; |
571 | default: | |
572 | CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", | |
573 | crw0->erc); | |
574 | } | |
e6b6e10a | 575 | } |
e5854a58 | 576 | |
99611f87 | 577 | int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) |
c820de39 CH |
578 | { |
579 | int i; | |
580 | int mask; | |
581 | ||
582 | for (i = 0; i < 8; i++) { | |
583 | mask = 0x80 >> i; | |
584 | if (!(ssd->path_mask & mask)) | |
585 | continue; | |
99611f87 | 586 | if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) |
c820de39 CH |
587 | continue; |
588 | if ((ssd->fla_valid_mask & mask) && | |
99611f87 | 589 | ((ssd->fla[i] & link->fla_mask) != link->fla)) |
c820de39 CH |
590 | continue; |
591 | return mask; | |
592 | } | |
593 | return 0; | |
594 | } | |
595 | EXPORT_SYMBOL_GPL(chp_ssd_get_mask); | |
596 | ||
e5854a58 PO |
597 | static inline int info_bit_num(struct chp_id id) |
598 | { | |
599 | return id.id + id.cssid * (__MAX_CHPID + 1); | |
600 | } | |
601 | ||
602 | /* Force chp_info refresh on next call to info_validate(). */ | |
603 | static void info_expire(void) | |
604 | { | |
605 | mutex_lock(&info_lock); | |
606 | chp_info_expires = jiffies - 1; | |
607 | mutex_unlock(&info_lock); | |
608 | } | |
609 | ||
610 | /* Ensure that chp_info is up-to-date. */ | |
611 | static int info_update(void) | |
612 | { | |
613 | int rc; | |
614 | ||
615 | mutex_lock(&info_lock); | |
616 | rc = 0; | |
617 | if (time_after(jiffies, chp_info_expires)) { | |
618 | /* Data is too old, update. */ | |
619 | rc = sclp_chp_read_info(&chp_info); | |
620 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; | |
621 | } | |
622 | mutex_unlock(&info_lock); | |
623 | ||
624 | return rc; | |
625 | } | |
626 | ||
627 | /** | |
628 | * chp_info_get_status - retrieve configure status of a channel-path | |
629 | * @chpid: channel-path ID | |
630 | * | |
631 | * On success, return 0 for standby, 1 for configured, 2 for reserved, | |
632 | * 3 for not recognized. Return negative error code on error. | |
633 | */ | |
634 | int chp_info_get_status(struct chp_id chpid) | |
635 | { | |
636 | int rc; | |
637 | int bit; | |
638 | ||
639 | rc = info_update(); | |
640 | if (rc) | |
641 | return rc; | |
642 | ||
643 | bit = info_bit_num(chpid); | |
644 | mutex_lock(&info_lock); | |
645 | if (!chp_test_bit(chp_info.recognized, bit)) | |
646 | rc = CHP_STATUS_NOT_RECOGNIZED; | |
647 | else if (chp_test_bit(chp_info.configured, bit)) | |
648 | rc = CHP_STATUS_CONFIGURED; | |
649 | else if (chp_test_bit(chp_info.standby, bit)) | |
650 | rc = CHP_STATUS_STANDBY; | |
651 | else | |
652 | rc = CHP_STATUS_RESERVED; | |
653 | mutex_unlock(&info_lock); | |
654 | ||
655 | return rc; | |
656 | } | |
657 | ||
658 | /* Return configure task for chpid. */ | |
659 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) | |
660 | { | |
661 | return chp_cfg_task[chpid.cssid][chpid.id]; | |
662 | } | |
663 | ||
664 | /* Set configure task for chpid. */ | |
665 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) | |
666 | { | |
667 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; | |
668 | } | |
669 | ||
4475aeb8 SO |
670 | /* Fetch the first configure task. Set chpid accordingly. */ |
671 | static enum cfg_task_t chp_cfg_fetch_task(struct chp_id *chpid) | |
672 | { | |
673 | enum cfg_task_t t = cfg_none; | |
674 | ||
675 | chp_id_for_each(chpid) { | |
676 | t = cfg_get_task(*chpid); | |
677 | if (t != cfg_none) | |
678 | break; | |
679 | } | |
680 | ||
681 | return t; | |
682 | } | |
683 | ||
e5854a58 PO |
684 | /* Perform one configure/deconfigure request. Reschedule work function until |
685 | * last request. */ | |
686 | static void cfg_func(struct work_struct *work) | |
687 | { | |
688 | struct chp_id chpid; | |
689 | enum cfg_task_t t; | |
683c5418 | 690 | int rc; |
e5854a58 | 691 | |
837c5220 | 692 | spin_lock(&cfg_lock); |
4475aeb8 | 693 | t = chp_cfg_fetch_task(&chpid); |
837c5220 | 694 | spin_unlock(&cfg_lock); |
e5854a58 PO |
695 | |
696 | switch (t) { | |
697 | case cfg_configure: | |
683c5418 PO |
698 | rc = sclp_chp_configure(chpid); |
699 | if (rc) | |
700 | CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" | |
701 | "%d\n", chpid.cssid, chpid.id, rc); | |
702 | else { | |
703 | info_expire(); | |
704 | chsc_chp_online(chpid); | |
705 | } | |
e5854a58 PO |
706 | break; |
707 | case cfg_deconfigure: | |
683c5418 PO |
708 | rc = sclp_chp_deconfigure(chpid); |
709 | if (rc) | |
710 | CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" | |
711 | "%d\n", chpid.cssid, chpid.id, rc); | |
712 | else { | |
713 | info_expire(); | |
714 | chsc_chp_offline(chpid); | |
715 | } | |
e5854a58 PO |
716 | break; |
717 | case cfg_none: | |
718 | /* Get updated information after last change. */ | |
719 | info_update(); | |
e5854a58 PO |
720 | wake_up_interruptible(&cfg_wait_queue); |
721 | return; | |
722 | } | |
4475aeb8 SO |
723 | spin_lock(&cfg_lock); |
724 | if (t == cfg_get_task(chpid)) | |
725 | cfg_set_task(chpid, cfg_none); | |
726 | spin_unlock(&cfg_lock); | |
7b1058bc | 727 | schedule_work(&cfg_work); |
e5854a58 PO |
728 | } |
729 | ||
730 | /** | |
731 | * chp_cfg_schedule - schedule chpid configuration request | |
732 | * @chpid - channel-path ID | |
733 | * @configure - Non-zero for configure, zero for deconfigure | |
734 | * | |
735 | * Schedule a channel-path configuration/deconfiguration request. | |
736 | */ | |
737 | void chp_cfg_schedule(struct chp_id chpid, int configure) | |
738 | { | |
739 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, | |
740 | configure); | |
837c5220 | 741 | spin_lock(&cfg_lock); |
e5854a58 | 742 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); |
837c5220 | 743 | spin_unlock(&cfg_lock); |
7b1058bc | 744 | schedule_work(&cfg_work); |
e5854a58 PO |
745 | } |
746 | ||
747 | /** | |
748 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request | |
749 | * @chpid - channel-path ID | |
750 | * | |
751 | * Cancel an active channel-path deconfiguration request if it has not yet | |
752 | * been performed. | |
753 | */ | |
754 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) | |
755 | { | |
756 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); | |
837c5220 | 757 | spin_lock(&cfg_lock); |
e5854a58 PO |
758 | if (cfg_get_task(chpid) == cfg_deconfigure) |
759 | cfg_set_task(chpid, cfg_none); | |
837c5220 | 760 | spin_unlock(&cfg_lock); |
e5854a58 PO |
761 | } |
762 | ||
4475aeb8 SO |
763 | static bool cfg_idle(void) |
764 | { | |
765 | struct chp_id chpid; | |
766 | enum cfg_task_t t; | |
767 | ||
768 | spin_lock(&cfg_lock); | |
769 | t = chp_cfg_fetch_task(&chpid); | |
770 | spin_unlock(&cfg_lock); | |
771 | ||
772 | return t == cfg_none; | |
773 | } | |
774 | ||
e5854a58 PO |
775 | static int cfg_wait_idle(void) |
776 | { | |
4475aeb8 | 777 | if (wait_event_interruptible(cfg_wait_queue, cfg_idle())) |
e5854a58 PO |
778 | return -ERESTARTSYS; |
779 | return 0; | |
780 | } | |
781 | ||
782 | static int __init chp_init(void) | |
783 | { | |
784 | struct chp_id chpid; | |
179a98cb | 785 | int state, ret; |
e5854a58 | 786 | |
f5daba1d | 787 | ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); |
c1156189 CH |
788 | if (ret) |
789 | return ret; | |
e5854a58 PO |
790 | INIT_WORK(&cfg_work, cfg_func); |
791 | init_waitqueue_head(&cfg_wait_queue); | |
792 | if (info_update()) | |
793 | return 0; | |
794 | /* Register available channel-paths. */ | |
795 | chp_id_for_each(&chpid) { | |
179a98cb SO |
796 | state = chp_info_get_status(chpid); |
797 | if (state == CHP_STATUS_CONFIGURED || | |
798 | state == CHP_STATUS_STANDBY) | |
e5854a58 PO |
799 | chp_new(chpid); |
800 | } | |
801 | ||
802 | return 0; | |
803 | } | |
804 | ||
805 | subsys_initcall(chp_init); |