]>
Commit | Line | Data |
---|---|---|
724117b7 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e6b6e10a | 2 | /* |
a53c8fab | 3 | * Copyright IBM Corp. 1999, 2010 |
e6b6e10a PO |
4 | * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) |
5 | * Arnd Bergmann (arndb@de.ibm.com) | |
6 | * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | |
7 | */ | |
8 | ||
9 | #include <linux/bug.h> | |
10 | #include <linux/workqueue.h> | |
11 | #include <linux/spinlock.h> | |
3a4c5d59 HC |
12 | #include <linux/export.h> |
13 | #include <linux/sched.h> | |
e5854a58 PO |
14 | #include <linux/init.h> |
15 | #include <linux/jiffies.h> | |
16 | #include <linux/wait.h> | |
17 | #include <linux/mutex.h> | |
a0ea22c3 | 18 | #include <linux/errno.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
e5854a58 PO |
20 | #include <asm/chpid.h> |
21 | #include <asm/sclp.h> | |
f5daba1d | 22 | #include <asm/crw.h> |
e6b6e10a | 23 | |
e6b6e10a PO |
24 | #include "cio.h" |
25 | #include "css.h" | |
26 | #include "ioasm.h" | |
27 | #include "cio_debug.h" | |
28 | #include "chp.h" | |
29 | ||
30 | #define to_channelpath(device) container_of(device, struct channel_path, dev) | |
e5854a58 PO |
31 | #define CHP_INFO_UPDATE_INTERVAL 1*HZ |
32 | ||
33 | enum cfg_task_t { | |
34 | cfg_none, | |
35 | cfg_configure, | |
36 | cfg_deconfigure | |
37 | }; | |
38 | ||
39 | /* Map for pending configure tasks. */ | |
40 | static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1]; | |
837c5220 | 41 | static DEFINE_SPINLOCK(cfg_lock); |
e5854a58 PO |
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47 | /* Time after which channel-path status may be outdated.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 | ||
e5854a58 PO |
50 | static struct work_struct cfg_work; |
51 | ||
52 | /* Wait queue for configure completion events. */ | |
53 | static wait_queue_head_t cfg_wait_queue; | |
e6b6e10a | 54 | |
e6b6e10a PO |
55 | /* Set vary state for given chpid. */ |
56 | static void set_chp_logically_online(struct chp_id chpid, int onoff) | |
57 | { | |
58 | chpid_to_chp(chpid)->state = onoff; | |
59 | } | |
60 | ||
af901ca1 | 61 | /* On success return 0 if channel-path is varied offline, 1 if it is varied |
e6b6e10a PO |
62 | * online. Return -ENODEV if channel-path is not registered. */ |
63 | int chp_get_status(struct chp_id chpid) | |
64 | { | |
65 | return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); | |
66 | } | |
67 | ||
68 | /** | |
69 | * chp_get_sch_opm - return opm for subchannel | |
70 | * @sch: subchannel | |
71 | * | |
72 | * Calculate and return the operational path mask (opm) based on the chpids | |
73 | * used by the subchannel and the status of the associated channel-paths. | |
74 | */ | |
75 | u8 chp_get_sch_opm(struct subchannel *sch) | |
76 | { | |
77 | struct chp_id chpid; | |
78 | int opm; | |
79 | int i; | |
80 | ||
81 | opm = 0; | |
82 | chp_id_init(&chpid); | |
a0ea22c3 | 83 | for (i = 0; i < 8; i++) { |
e6b6e10a PO |
84 | opm <<= 1; |
85 | chpid.id = sch->schib.pmcw.chpid[i]; | |
86 | if (chp_get_status(chpid) != 0) | |
87 | opm |= 1; | |
88 | } | |
89 | return opm; | |
90 | } | |
44a1c19e | 91 | EXPORT_SYMBOL_GPL(chp_get_sch_opm); |
e6b6e10a PO |
92 | |
93 | /** | |
94 | * chp_is_registered - check if a channel-path is registered | |
95 | * @chpid: channel-path ID | |
96 | * | |
97 | * Return non-zero if a channel-path with the given chpid is registered, | |
98 | * zero otherwise. | |
99 | */ | |
100 | int chp_is_registered(struct chp_id chpid) | |
101 | { | |
102 | return chpid_to_chp(chpid) != NULL; | |
103 | } | |
104 | ||
105 | /* | |
106 | * Function: s390_vary_chpid | |
107 | * Varies the specified chpid online or offline | |
108 | */ | |
109 | static int s390_vary_chpid(struct chp_id chpid, int on) | |
110 | { | |
111 | char dbf_text[15]; | |
112 | int status; | |
113 | ||
114 | sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, | |
115 | chpid.id); | |
a0ea22c3 | 116 | CIO_TRACE_EVENT(2, dbf_text); |
e6b6e10a PO |
117 | |
118 | status = chp_get_status(chpid); | |
c78aa6cb ME |
119 | if (!on && !status) |
120 | return 0; | |
e6b6e10a PO |
121 | |
122 | set_chp_logically_online(chpid, on); | |
123 | chsc_chp_vary(chpid, on); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | /* | |
128 | * Channel measurement related functions | |
129 | */ | |
2c3c8bea CW |
130 | static ssize_t chp_measurement_chars_read(struct file *filp, |
131 | struct kobject *kobj, | |
91a69029 ZR |
132 | struct bin_attribute *bin_attr, |
133 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
134 | { |
135 | struct channel_path *chp; | |
364c8558 | 136 | struct device *device; |
e6b6e10a | 137 | |
364c8558 HC |
138 | device = container_of(kobj, struct device, kobj); |
139 | chp = to_channelpath(device); | |
0d9bfe91 | 140 | if (chp->cmg == -1) |
e6b6e10a PO |
141 | return 0; |
142 | ||
0d9bfe91 SO |
143 | return memory_read_from_buffer(buf, count, &off, &chp->cmg_chars, |
144 | sizeof(chp->cmg_chars)); | |
e6b6e10a PO |
145 | } |
146 | ||
ac34bbc3 | 147 | static const struct bin_attribute chp_measurement_chars_attr = { |
e6b6e10a PO |
148 | .attr = { |
149 | .name = "measurement_chars", | |
150 | .mode = S_IRUSR, | |
e6b6e10a PO |
151 | }, |
152 | .size = sizeof(struct cmg_chars), | |
153 | .read = chp_measurement_chars_read, | |
154 | }; | |
155 | ||
156 | static void chp_measurement_copy_block(struct cmg_entry *buf, | |
157 | struct channel_subsystem *css, | |
158 | struct chp_id chpid) | |
159 | { | |
160 | void *area; | |
161 | struct cmg_entry *entry, reference_buf; | |
162 | int idx; | |
163 | ||
164 | if (chpid.id < 128) { | |
165 | area = css->cub_addr1; | |
166 | idx = chpid.id; | |
167 | } else { | |
168 | area = css->cub_addr2; | |
169 | idx = chpid.id - 128; | |
170 | } | |
171 | entry = area + (idx * sizeof(struct cmg_entry)); | |
172 | do { | |
173 | memcpy(buf, entry, sizeof(*entry)); | |
174 | memcpy(&reference_buf, entry, sizeof(*entry)); | |
175 | } while (reference_buf.values[0] != buf->values[0]); | |
176 | } | |
177 | ||
2c3c8bea | 178 | static ssize_t chp_measurement_read(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
179 | struct bin_attribute *bin_attr, |
180 | char *buf, loff_t off, size_t count) | |
e6b6e10a PO |
181 | { |
182 | struct channel_path *chp; | |
183 | struct channel_subsystem *css; | |
364c8558 | 184 | struct device *device; |
e6b6e10a PO |
185 | unsigned int size; |
186 | ||
364c8558 HC |
187 | device = container_of(kobj, struct device, kobj); |
188 | chp = to_channelpath(device); | |
e6b6e10a PO |
189 | css = to_css(chp->dev.parent); |
190 | ||
191 | size = sizeof(struct cmg_entry); | |
192 | ||
193 | /* Only allow single reads. */ | |
194 | if (off || count < size) | |
195 | return 0; | |
196 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); | |
197 | count = size; | |
198 | return count; | |
199 | } | |
200 | ||
ac34bbc3 | 201 | static const struct bin_attribute chp_measurement_attr = { |
e6b6e10a PO |
202 | .attr = { |
203 | .name = "measurement", | |
204 | .mode = S_IRUSR, | |
e6b6e10a PO |
205 | }, |
206 | .size = sizeof(struct cmg_entry), | |
207 | .read = chp_measurement_read, | |
208 | }; | |
209 | ||
210 | void chp_remove_cmg_attr(struct channel_path *chp) | |
211 | { | |
212 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
213 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); | |
214 | } | |
215 | ||
216 | int chp_add_cmg_attr(struct channel_path *chp) | |
217 | { | |
218 | int ret; | |
219 | ||
220 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
221 | if (ret) | |
222 | return ret; | |
223 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); | |
224 | if (ret) | |
225 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); | |
226 | return ret; | |
227 | } | |
228 | ||
229 | /* | |
230 | * Files for the channel path entries. | |
231 | */ | |
232 | static ssize_t chp_status_show(struct device *dev, | |
233 | struct device_attribute *attr, char *buf) | |
234 | { | |
05469607 | 235 | struct channel_path *chp = to_channelpath(dev); |
b730f3a9 | 236 | int status; |
e6b6e10a | 237 | |
b730f3a9 SO |
238 | mutex_lock(&chp->lock); |
239 | status = chp->state; | |
240 | mutex_unlock(&chp->lock); | |
241 | ||
242 | return status ? sprintf(buf, "online\n") : sprintf(buf, "offline\n"); | |
e6b6e10a PO |
243 | } |
244 | ||
245 | static ssize_t chp_status_write(struct device *dev, | |
246 | struct device_attribute *attr, | |
247 | const char *buf, size_t count) | |
248 | { | |
05469607 | 249 | struct channel_path *cp = to_channelpath(dev); |
e6b6e10a PO |
250 | char cmd[10]; |
251 | int num_args; | |
252 | int error; | |
253 | ||
254 | num_args = sscanf(buf, "%5s", cmd); | |
255 | if (!num_args) | |
256 | return count; | |
257 | ||
3f8bfd9a | 258 | if (!strncasecmp(cmd, "on", 2) || !strcmp(cmd, "1")) { |
b730f3a9 | 259 | mutex_lock(&cp->lock); |
e6b6e10a | 260 | error = s390_vary_chpid(cp->chpid, 1); |
b730f3a9 | 261 | mutex_unlock(&cp->lock); |
3f8bfd9a | 262 | } else if (!strncasecmp(cmd, "off", 3) || !strcmp(cmd, "0")) { |
b730f3a9 | 263 | mutex_lock(&cp->lock); |
e6b6e10a | 264 | error = s390_vary_chpid(cp->chpid, 0); |
b730f3a9 SO |
265 | mutex_unlock(&cp->lock); |
266 | } else | |
e6b6e10a PO |
267 | error = -EINVAL; |
268 | ||
269 | return error < 0 ? error : count; | |
e6b6e10a PO |
270 | } |
271 | ||
272 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); | |
273 | ||
e5854a58 PO |
274 | static ssize_t chp_configure_show(struct device *dev, |
275 | struct device_attribute *attr, char *buf) | |
276 | { | |
277 | struct channel_path *cp; | |
278 | int status; | |
279 | ||
05469607 | 280 | cp = to_channelpath(dev); |
e5854a58 PO |
281 | status = chp_info_get_status(cp->chpid); |
282 | if (status < 0) | |
283 | return status; | |
284 | ||
285 | return snprintf(buf, PAGE_SIZE, "%d\n", status); | |
286 | } | |
287 | ||
288 | static int cfg_wait_idle(void); | |
289 | ||
290 | static ssize_t chp_configure_write(struct device *dev, | |
291 | struct device_attribute *attr, | |
292 | const char *buf, size_t count) | |
293 | { | |
294 | struct channel_path *cp; | |
295 | int val; | |
296 | char delim; | |
297 | ||
298 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
299 | return -EINVAL; | |
300 | if (val != 0 && val != 1) | |
301 | return -EINVAL; | |
05469607 | 302 | cp = to_channelpath(dev); |
e5854a58 PO |
303 | chp_cfg_schedule(cp->chpid, val); |
304 | cfg_wait_idle(); | |
305 | ||
306 | return count; | |
307 | } | |
308 | ||
309 | static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); | |
310 | ||
e6b6e10a PO |
311 | static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
312 | char *buf) | |
313 | { | |
05469607 | 314 | struct channel_path *chp = to_channelpath(dev); |
b730f3a9 | 315 | u8 type; |
e6b6e10a | 316 | |
b730f3a9 SO |
317 | mutex_lock(&chp->lock); |
318 | type = chp->desc.desc; | |
319 | mutex_unlock(&chp->lock); | |
320 | return sprintf(buf, "%x\n", type); | |
e6b6e10a PO |
321 | } |
322 | ||
323 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); | |
324 | ||
325 | static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, | |
326 | char *buf) | |
327 | { | |
328 | struct channel_path *chp = to_channelpath(dev); | |
329 | ||
330 | if (!chp) | |
331 | return 0; | |
332 | if (chp->cmg == -1) /* channel measurements not available */ | |
333 | return sprintf(buf, "unknown\n"); | |
334 | return sprintf(buf, "%x\n", chp->cmg); | |
335 | } | |
336 | ||
337 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); | |
338 | ||
339 | static ssize_t chp_shared_show(struct device *dev, | |
340 | struct device_attribute *attr, char *buf) | |
341 | { | |
342 | struct channel_path *chp = to_channelpath(dev); | |
343 | ||
344 | if (!chp) | |
345 | return 0; | |
346 | if (chp->shared == -1) /* channel measurements not available */ | |
347 | return sprintf(buf, "unknown\n"); | |
348 | return sprintf(buf, "%x\n", chp->shared); | |
349 | } | |
350 | ||
351 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); | |
352 | ||
ba54229d PO |
353 | static ssize_t chp_chid_show(struct device *dev, struct device_attribute *attr, |
354 | char *buf) | |
355 | { | |
356 | struct channel_path *chp = to_channelpath(dev); | |
357 | ssize_t rc; | |
358 | ||
359 | mutex_lock(&chp->lock); | |
360 | if (chp->desc_fmt1.flags & 0x10) | |
361 | rc = sprintf(buf, "%04x\n", chp->desc_fmt1.chid); | |
362 | else | |
363 | rc = 0; | |
364 | mutex_unlock(&chp->lock); | |
365 | ||
366 | return rc; | |
367 | } | |
368 | static DEVICE_ATTR(chid, 0444, chp_chid_show, NULL); | |
369 | ||
370 | static ssize_t chp_chid_external_show(struct device *dev, | |
371 | struct device_attribute *attr, char *buf) | |
372 | { | |
373 | struct channel_path *chp = to_channelpath(dev); | |
374 | ssize_t rc; | |
375 | ||
376 | mutex_lock(&chp->lock); | |
377 | if (chp->desc_fmt1.flags & 0x10) | |
378 | rc = sprintf(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0); | |
379 | else | |
380 | rc = 0; | |
381 | mutex_unlock(&chp->lock); | |
382 | ||
383 | return rc; | |
384 | } | |
385 | static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL); | |
386 | ||
b9dd6524 SO |
387 | static ssize_t util_string_read(struct file *filp, struct kobject *kobj, |
388 | struct bin_attribute *attr, char *buf, | |
389 | loff_t off, size_t count) | |
390 | { | |
391 | struct channel_path *chp = to_channelpath(kobj_to_dev(kobj)); | |
392 | ssize_t rc; | |
393 | ||
394 | mutex_lock(&chp->lock); | |
395 | rc = memory_read_from_buffer(buf, count, &off, chp->desc_fmt3.util_str, | |
396 | sizeof(chp->desc_fmt3.util_str)); | |
397 | mutex_unlock(&chp->lock); | |
398 | ||
399 | return rc; | |
400 | } | |
401 | static BIN_ATTR_RO(util_string, | |
402 | sizeof(((struct channel_path_desc_fmt3 *)0)->util_str)); | |
403 | ||
404 | static struct bin_attribute *chp_bin_attrs[] = { | |
405 | &bin_attr_util_string, | |
406 | NULL, | |
407 | }; | |
408 | ||
a0ea22c3 | 409 | static struct attribute *chp_attrs[] = { |
e6b6e10a | 410 | &dev_attr_status.attr, |
e5854a58 | 411 | &dev_attr_configure.attr, |
e6b6e10a PO |
412 | &dev_attr_type.attr, |
413 | &dev_attr_cmg.attr, | |
414 | &dev_attr_shared.attr, | |
ba54229d PO |
415 | &dev_attr_chid.attr, |
416 | &dev_attr_chid_external.attr, | |
e6b6e10a PO |
417 | NULL, |
418 | }; | |
e6b6e10a PO |
419 | static struct attribute_group chp_attr_group = { |
420 | .attrs = chp_attrs, | |
b9dd6524 | 421 | .bin_attrs = chp_bin_attrs, |
e6b6e10a | 422 | }; |
ed35ba9a SO |
423 | static const struct attribute_group *chp_attr_groups[] = { |
424 | &chp_attr_group, | |
425 | NULL, | |
426 | }; | |
e6b6e10a PO |
427 | |
428 | static void chp_release(struct device *dev) | |
429 | { | |
430 | struct channel_path *cp; | |
431 | ||
05469607 | 432 | cp = to_channelpath(dev); |
e6b6e10a PO |
433 | kfree(cp); |
434 | } | |
435 | ||
cce0eacc PO |
436 | /** |
437 | * chp_update_desc - update channel-path description | |
364e3f90 | 438 | * @chp: channel-path |
cce0eacc | 439 | * |
9f3d6d7a SO |
440 | * Update the channel-path description of the specified channel-path |
441 | * including channel measurement related information. | |
cce0eacc PO |
442 | * Return zero on success, non-zero otherwise. |
443 | */ | |
444 | int chp_update_desc(struct channel_path *chp) | |
445 | { | |
446 | int rc; | |
447 | ||
ded27d8d | 448 | rc = chsc_determine_fmt0_channel_path_desc(chp->chpid, &chp->desc); |
cce0eacc PO |
449 | if (rc) |
450 | return rc; | |
451 | ||
0b601373 SO |
452 | /* |
453 | * Fetching the following data is optional. Not all machines or | |
454 | * hypervisors implement the required chsc commands. | |
455 | */ | |
456 | chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1); | |
fcc6dd4b | 457 | chsc_determine_fmt3_channel_path_desc(chp->chpid, &chp->desc_fmt3); |
0b601373 | 458 | chsc_get_channel_measurement_chars(chp); |
cce0eacc | 459 | |
0b601373 | 460 | return 0; |
cce0eacc PO |
461 | } |
462 | ||
e6b6e10a PO |
463 | /** |
464 | * chp_new - register a new channel-path | |
364e3f90 | 465 | * @chpid: channel-path ID |
e6b6e10a PO |
466 | * |
467 | * Create and register data structure representing new channel-path. Return | |
468 | * zero on success, non-zero otherwise. | |
469 | */ | |
470 | int chp_new(struct chp_id chpid) | |
471 | { | |
98cc43ab | 472 | struct channel_subsystem *css = css_by_id(chpid.cssid); |
e6b6e10a | 473 | struct channel_path *chp; |
87dc8a01 | 474 | int ret = 0; |
e6b6e10a | 475 | |
87dc8a01 | 476 | mutex_lock(&css->mutex); |
e5854a58 | 477 | if (chp_is_registered(chpid)) |
87dc8a01 | 478 | goto out; |
e6b6e10a | 479 | |
87dc8a01 SO |
480 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
481 | if (!chp) { | |
482 | ret = -ENOMEM; | |
483 | goto out; | |
484 | } | |
e6b6e10a PO |
485 | /* fill in status, etc. */ |
486 | chp->chpid = chpid; | |
487 | chp->state = 1; | |
98cc43ab | 488 | chp->dev.parent = &css->device; |
ed35ba9a | 489 | chp->dev.groups = chp_attr_groups; |
e6b6e10a | 490 | chp->dev.release = chp_release; |
b730f3a9 | 491 | mutex_init(&chp->lock); |
e6b6e10a PO |
492 | |
493 | /* Obtain channel path description and fill it in. */ | |
cce0eacc | 494 | ret = chp_update_desc(chp); |
e6b6e10a PO |
495 | if (ret) |
496 | goto out_free; | |
c9182e0f PO |
497 | if ((chp->desc.flags & 0x80) == 0) { |
498 | ret = -ENODEV; | |
499 | goto out_free; | |
500 | } | |
ec004407 | 501 | dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); |
e6b6e10a PO |
502 | |
503 | /* make it known to the system */ | |
504 | ret = device_register(&chp->dev); | |
505 | if (ret) { | |
e556bbbd CH |
506 | CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
507 | chpid.cssid, chpid.id, ret); | |
c6304933 SO |
508 | put_device(&chp->dev); |
509 | goto out; | |
e6b6e10a | 510 | } |
87dc8a01 | 511 | |
98cc43ab | 512 | if (css->cm_enabled) { |
e6b6e10a PO |
513 | ret = chp_add_cmg_attr(chp); |
514 | if (ret) { | |
e6b6e10a | 515 | device_unregister(&chp->dev); |
a2164b81 | 516 | goto out; |
e6b6e10a PO |
517 | } |
518 | } | |
98cc43ab | 519 | css->chps[chpid.id] = chp; |
a2164b81 | 520 | goto out; |
e6b6e10a PO |
521 | out_free: |
522 | kfree(chp); | |
a2164b81 | 523 | out: |
87dc8a01 | 524 | mutex_unlock(&css->mutex); |
e6b6e10a PO |
525 | return ret; |
526 | } | |
527 | ||
528 | /** | |
529 | * chp_get_chp_desc - return newly allocated channel-path description | |
530 | * @chpid: channel-path ID | |
531 | * | |
532 | * On success return a newly allocated copy of the channel-path description | |
533 | * data associated with the given channel-path ID. Return %NULL on error. | |
534 | */ | |
ded27d8d | 535 | struct channel_path_desc_fmt0 *chp_get_chp_desc(struct chp_id chpid) |
e6b6e10a PO |
536 | { |
537 | struct channel_path *chp; | |
ded27d8d | 538 | struct channel_path_desc_fmt0 *desc; |
e6b6e10a PO |
539 | |
540 | chp = chpid_to_chp(chpid); | |
541 | if (!chp) | |
542 | return NULL; | |
ded27d8d | 543 | desc = kmalloc(sizeof(*desc), GFP_KERNEL); |
e6b6e10a PO |
544 | if (!desc) |
545 | return NULL; | |
b730f3a9 SO |
546 | |
547 | mutex_lock(&chp->lock); | |
ded27d8d | 548 | memcpy(desc, &chp->desc, sizeof(*desc)); |
b730f3a9 | 549 | mutex_unlock(&chp->lock); |
e6b6e10a PO |
550 | return desc; |
551 | } | |
552 | ||
553 | /** | |
554 | * chp_process_crw - process channel-path status change | |
c1156189 CH |
555 | * @crw0: channel report-word to handler |
556 | * @crw1: second channel-report word (always NULL) | |
557 | * @overflow: crw overflow indication | |
e6b6e10a PO |
558 | * |
559 | * Handle channel-report-words indicating that the status of a channel-path | |
560 | * has changed. | |
561 | */ | |
c1156189 CH |
562 | static void chp_process_crw(struct crw *crw0, struct crw *crw1, |
563 | int overflow) | |
e6b6e10a PO |
564 | { |
565 | struct chp_id chpid; | |
566 | ||
c1156189 CH |
567 | if (overflow) { |
568 | css_schedule_eval_all(); | |
569 | return; | |
570 | } | |
571 | CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " | |
572 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
573 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
574 | crw0->erc, crw0->rsid); | |
575 | /* | |
576 | * Check for solicited machine checks. These are | |
577 | * created by reset channel path and need not be | |
578 | * handled here. | |
579 | */ | |
580 | if (crw0->slct) { | |
581 | CIO_CRW_EVENT(2, "solicited machine check for " | |
582 | "channel path %02X\n", crw0->rsid); | |
583 | return; | |
584 | } | |
e6b6e10a | 585 | chp_id_init(&chpid); |
c1156189 CH |
586 | chpid.id = crw0->rsid; |
587 | switch (crw0->erc) { | |
588 | case CRW_ERC_IPARM: /* Path has come. */ | |
2daace78 | 589 | case CRW_ERC_INIT: |
87dc8a01 | 590 | chp_new(chpid); |
83b3370c | 591 | chsc_chp_online(chpid); |
c1156189 CH |
592 | break; |
593 | case CRW_ERC_PERRI: /* Path has gone. */ | |
594 | case CRW_ERC_PERRN: | |
e6b6e10a | 595 | chsc_chp_offline(chpid); |
c1156189 CH |
596 | break; |
597 | default: | |
598 | CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", | |
599 | crw0->erc); | |
600 | } | |
e6b6e10a | 601 | } |
e5854a58 | 602 | |
99611f87 | 603 | int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) |
c820de39 CH |
604 | { |
605 | int i; | |
606 | int mask; | |
607 | ||
608 | for (i = 0; i < 8; i++) { | |
609 | mask = 0x80 >> i; | |
610 | if (!(ssd->path_mask & mask)) | |
611 | continue; | |
99611f87 | 612 | if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) |
c820de39 CH |
613 | continue; |
614 | if ((ssd->fla_valid_mask & mask) && | |
99611f87 | 615 | ((ssd->fla[i] & link->fla_mask) != link->fla)) |
c820de39 CH |
616 | continue; |
617 | return mask; | |
618 | } | |
619 | return 0; | |
620 | } | |
621 | EXPORT_SYMBOL_GPL(chp_ssd_get_mask); | |
622 | ||
e5854a58 PO |
623 | static inline int info_bit_num(struct chp_id id) |
624 | { | |
625 | return id.id + id.cssid * (__MAX_CHPID + 1); | |
626 | } | |
627 | ||
628 | /* Force chp_info refresh on next call to info_validate(). */ | |
629 | static void info_expire(void) | |
630 | { | |
631 | mutex_lock(&info_lock); | |
632 | chp_info_expires = jiffies - 1; | |
633 | mutex_unlock(&info_lock); | |
634 | } | |
635 | ||
636 | /* Ensure that chp_info is up-to-date. */ | |
637 | static int info_update(void) | |
638 | { | |
639 | int rc; | |
640 | ||
641 | mutex_lock(&info_lock); | |
642 | rc = 0; | |
643 | if (time_after(jiffies, chp_info_expires)) { | |
644 | /* Data is too old, update. */ | |
645 | rc = sclp_chp_read_info(&chp_info); | |
646 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; | |
647 | } | |
648 | mutex_unlock(&info_lock); | |
649 | ||
650 | return rc; | |
651 | } | |
652 | ||
653 | /** | |
654 | * chp_info_get_status - retrieve configure status of a channel-path | |
655 | * @chpid: channel-path ID | |
656 | * | |
657 | * On success, return 0 for standby, 1 for configured, 2 for reserved, | |
658 | * 3 for not recognized. Return negative error code on error. | |
659 | */ | |
660 | int chp_info_get_status(struct chp_id chpid) | |
661 | { | |
662 | int rc; | |
663 | int bit; | |
664 | ||
665 | rc = info_update(); | |
666 | if (rc) | |
667 | return rc; | |
668 | ||
669 | bit = info_bit_num(chpid); | |
670 | mutex_lock(&info_lock); | |
671 | if (!chp_test_bit(chp_info.recognized, bit)) | |
672 | rc = CHP_STATUS_NOT_RECOGNIZED; | |
673 | else if (chp_test_bit(chp_info.configured, bit)) | |
674 | rc = CHP_STATUS_CONFIGURED; | |
675 | else if (chp_test_bit(chp_info.standby, bit)) | |
676 | rc = CHP_STATUS_STANDBY; | |
677 | else | |
678 | rc = CHP_STATUS_RESERVED; | |
679 | mutex_unlock(&info_lock); | |
680 | ||
681 | return rc; | |
682 | } | |
683 | ||
684 | /* Return configure task for chpid. */ | |
685 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) | |
686 | { | |
687 | return chp_cfg_task[chpid.cssid][chpid.id]; | |
688 | } | |
689 | ||
690 | /* Set configure task for chpid. */ | |
691 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) | |
692 | { | |
693 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; | |
694 | } | |
695 | ||
4475aeb8 SO |
696 | /* Fetch the first configure task. Set chpid accordingly. */ |
697 | static enum cfg_task_t chp_cfg_fetch_task(struct chp_id *chpid) | |
698 | { | |
699 | enum cfg_task_t t = cfg_none; | |
700 | ||
701 | chp_id_for_each(chpid) { | |
702 | t = cfg_get_task(*chpid); | |
703 | if (t != cfg_none) | |
704 | break; | |
705 | } | |
706 | ||
707 | return t; | |
708 | } | |
709 | ||
e5854a58 PO |
710 | /* Perform one configure/deconfigure request. Reschedule work function until |
711 | * last request. */ | |
712 | static void cfg_func(struct work_struct *work) | |
713 | { | |
714 | struct chp_id chpid; | |
715 | enum cfg_task_t t; | |
683c5418 | 716 | int rc; |
e5854a58 | 717 | |
837c5220 | 718 | spin_lock(&cfg_lock); |
4475aeb8 | 719 | t = chp_cfg_fetch_task(&chpid); |
837c5220 | 720 | spin_unlock(&cfg_lock); |
e5854a58 PO |
721 | |
722 | switch (t) { | |
723 | case cfg_configure: | |
683c5418 PO |
724 | rc = sclp_chp_configure(chpid); |
725 | if (rc) | |
726 | CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" | |
727 | "%d\n", chpid.cssid, chpid.id, rc); | |
728 | else { | |
729 | info_expire(); | |
730 | chsc_chp_online(chpid); | |
731 | } | |
e5854a58 PO |
732 | break; |
733 | case cfg_deconfigure: | |
683c5418 PO |
734 | rc = sclp_chp_deconfigure(chpid); |
735 | if (rc) | |
736 | CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" | |
737 | "%d\n", chpid.cssid, chpid.id, rc); | |
738 | else { | |
739 | info_expire(); | |
740 | chsc_chp_offline(chpid); | |
741 | } | |
e5854a58 PO |
742 | break; |
743 | case cfg_none: | |
744 | /* Get updated information after last change. */ | |
745 | info_update(); | |
e5854a58 PO |
746 | wake_up_interruptible(&cfg_wait_queue); |
747 | return; | |
748 | } | |
4475aeb8 SO |
749 | spin_lock(&cfg_lock); |
750 | if (t == cfg_get_task(chpid)) | |
751 | cfg_set_task(chpid, cfg_none); | |
752 | spin_unlock(&cfg_lock); | |
7b1058bc | 753 | schedule_work(&cfg_work); |
e5854a58 PO |
754 | } |
755 | ||
756 | /** | |
757 | * chp_cfg_schedule - schedule chpid configuration request | |
364e3f90 SO |
758 | * @chpid: channel-path ID |
759 | * @configure: Non-zero for configure, zero for deconfigure | |
e5854a58 PO |
760 | * |
761 | * Schedule a channel-path configuration/deconfiguration request. | |
762 | */ | |
763 | void chp_cfg_schedule(struct chp_id chpid, int configure) | |
764 | { | |
765 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, | |
766 | configure); | |
837c5220 | 767 | spin_lock(&cfg_lock); |
e5854a58 | 768 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); |
837c5220 | 769 | spin_unlock(&cfg_lock); |
7b1058bc | 770 | schedule_work(&cfg_work); |
e5854a58 PO |
771 | } |
772 | ||
773 | /** | |
774 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request | |
364e3f90 | 775 | * @chpid: channel-path ID |
e5854a58 PO |
776 | * |
777 | * Cancel an active channel-path deconfiguration request if it has not yet | |
778 | * been performed. | |
779 | */ | |
780 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) | |
781 | { | |
782 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); | |
837c5220 | 783 | spin_lock(&cfg_lock); |
e5854a58 PO |
784 | if (cfg_get_task(chpid) == cfg_deconfigure) |
785 | cfg_set_task(chpid, cfg_none); | |
837c5220 | 786 | spin_unlock(&cfg_lock); |
e5854a58 PO |
787 | } |
788 | ||
4475aeb8 SO |
789 | static bool cfg_idle(void) |
790 | { | |
791 | struct chp_id chpid; | |
792 | enum cfg_task_t t; | |
793 | ||
794 | spin_lock(&cfg_lock); | |
795 | t = chp_cfg_fetch_task(&chpid); | |
796 | spin_unlock(&cfg_lock); | |
797 | ||
798 | return t == cfg_none; | |
799 | } | |
800 | ||
e5854a58 PO |
801 | static int cfg_wait_idle(void) |
802 | { | |
4475aeb8 | 803 | if (wait_event_interruptible(cfg_wait_queue, cfg_idle())) |
e5854a58 PO |
804 | return -ERESTARTSYS; |
805 | return 0; | |
806 | } | |
807 | ||
808 | static int __init chp_init(void) | |
809 | { | |
810 | struct chp_id chpid; | |
179a98cb | 811 | int state, ret; |
e5854a58 | 812 | |
f5daba1d | 813 | ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); |
c1156189 CH |
814 | if (ret) |
815 | return ret; | |
e5854a58 PO |
816 | INIT_WORK(&cfg_work, cfg_func); |
817 | init_waitqueue_head(&cfg_wait_queue); | |
818 | if (info_update()) | |
819 | return 0; | |
820 | /* Register available channel-paths. */ | |
821 | chp_id_for_each(&chpid) { | |
179a98cb SO |
822 | state = chp_info_get_status(chpid); |
823 | if (state == CHP_STATUS_CONFIGURED || | |
824 | state == CHP_STATUS_STANDBY) | |
e5854a58 PO |
825 | chp_new(chpid); |
826 | } | |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
831 | subsys_initcall(chp_init); |