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47 | /* Time after which channel-path status may be outdated.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. */ | |
3081e616 | 53 | static DECLARE_WAIT_QUEUE_HEAD(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 | */ | |
b4691baa PO |
130 | static ssize_t measurement_chars_read(struct file *filp, struct kobject *kobj, |
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 | |
0d730b57 | 137 | device = kobj_to_dev(kobj); |
364c8558 | 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 | 144 | } |
b4691baa | 145 | static BIN_ATTR_ADMIN_RO(measurement_chars, sizeof(struct cmg_chars)); |
e6b6e10a | 146 | |
2dc8903a PO |
147 | static ssize_t chp_measurement_copy_block(void *buf, loff_t off, size_t count, |
148 | struct kobject *kobj, bool extended) | |
e6b6e10a PO |
149 | { |
150 | struct channel_path *chp; | |
151 | struct channel_subsystem *css; | |
364c8558 | 152 | struct device *device; |
e6b6e10a | 153 | unsigned int size; |
2dc8903a PO |
154 | void *area, *entry; |
155 | int id, idx; | |
e6b6e10a | 156 | |
0d730b57 | 157 | device = kobj_to_dev(kobj); |
364c8558 | 158 | chp = to_channelpath(device); |
e6b6e10a | 159 | css = to_css(chp->dev.parent); |
2dc8903a | 160 | id = chp->chpid.id; |
e6b6e10a | 161 | |
2dc8903a PO |
162 | if (extended) { |
163 | /* Check if extended measurement data is available. */ | |
164 | if (!chp->extended) | |
165 | return 0; | |
166 | ||
167 | size = sizeof(struct cmg_ext_entry); | |
168 | area = css->ecub[id / CSS_ECUES_PER_PAGE]; | |
169 | idx = id % CSS_ECUES_PER_PAGE; | |
170 | } else { | |
171 | size = sizeof(struct cmg_entry); | |
172 | area = css->cub[id / CSS_CUES_PER_PAGE]; | |
173 | idx = id % CSS_CUES_PER_PAGE; | |
174 | } | |
175 | entry = area + (idx * size); | |
e6b6e10a PO |
176 | |
177 | /* Only allow single reads. */ | |
178 | if (off || count < size) | |
179 | return 0; | |
2dc8903a PO |
180 | |
181 | memcpy(buf, entry, size); | |
182 | ||
183 | return size; | |
184 | } | |
185 | ||
186 | static ssize_t measurement_read(struct file *filp, struct kobject *kobj, | |
187 | struct bin_attribute *bin_attr, | |
188 | char *buf, loff_t off, size_t count) | |
189 | { | |
190 | return chp_measurement_copy_block(buf, off, count, kobj, false); | |
e6b6e10a | 191 | } |
b4691baa | 192 | static BIN_ATTR_ADMIN_RO(measurement, sizeof(struct cmg_entry)); |
e6b6e10a | 193 | |
2dc8903a PO |
194 | static ssize_t ext_measurement_read(struct file *filp, struct kobject *kobj, |
195 | struct bin_attribute *bin_attr, | |
196 | char *buf, loff_t off, size_t count) | |
197 | { | |
198 | return chp_measurement_copy_block(buf, off, count, kobj, true); | |
199 | } | |
200 | static BIN_ATTR_ADMIN_RO(ext_measurement, sizeof(struct cmg_ext_entry)); | |
201 | ||
b4691baa PO |
202 | static struct bin_attribute *measurement_attrs[] = { |
203 | &bin_attr_measurement_chars, | |
204 | &bin_attr_measurement, | |
2dc8903a | 205 | &bin_attr_ext_measurement, |
b4691baa | 206 | NULL, |
e6b6e10a | 207 | }; |
b4691baa | 208 | BIN_ATTRIBUTE_GROUPS(measurement); |
e6b6e10a PO |
209 | |
210 | void chp_remove_cmg_attr(struct channel_path *chp) | |
211 | { | |
b4691baa | 212 | device_remove_groups(&chp->dev, measurement_groups); |
e6b6e10a PO |
213 | } |
214 | ||
215 | int chp_add_cmg_attr(struct channel_path *chp) | |
216 | { | |
b4691baa | 217 | return device_add_groups(&chp->dev, measurement_groups); |
e6b6e10a PO |
218 | } |
219 | ||
220 | /* | |
221 | * Files for the channel path entries. | |
222 | */ | |
223 | static ssize_t chp_status_show(struct device *dev, | |
224 | struct device_attribute *attr, char *buf) | |
225 | { | |
05469607 | 226 | struct channel_path *chp = to_channelpath(dev); |
b730f3a9 | 227 | int status; |
e6b6e10a | 228 | |
b730f3a9 SO |
229 | mutex_lock(&chp->lock); |
230 | status = chp->state; | |
231 | mutex_unlock(&chp->lock); | |
232 | ||
233 | return status ? sprintf(buf, "online\n") : sprintf(buf, "offline\n"); | |
e6b6e10a PO |
234 | } |
235 | ||
236 | static ssize_t chp_status_write(struct device *dev, | |
237 | struct device_attribute *attr, | |
238 | const char *buf, size_t count) | |
239 | { | |
05469607 | 240 | struct channel_path *cp = to_channelpath(dev); |
e6b6e10a PO |
241 | char cmd[10]; |
242 | int num_args; | |
243 | int error; | |
244 | ||
245 | num_args = sscanf(buf, "%5s", cmd); | |
246 | if (!num_args) | |
247 | return count; | |
248 | ||
c749d8c0 VV |
249 | /* Wait until previous actions have settled. */ |
250 | css_wait_for_slow_path(); | |
251 | ||
3f8bfd9a | 252 | if (!strncasecmp(cmd, "on", 2) || !strcmp(cmd, "1")) { |
b730f3a9 | 253 | mutex_lock(&cp->lock); |
e6b6e10a | 254 | error = s390_vary_chpid(cp->chpid, 1); |
b730f3a9 | 255 | mutex_unlock(&cp->lock); |
3f8bfd9a | 256 | } else if (!strncasecmp(cmd, "off", 3) || !strcmp(cmd, "0")) { |
b730f3a9 | 257 | mutex_lock(&cp->lock); |
e6b6e10a | 258 | error = s390_vary_chpid(cp->chpid, 0); |
b730f3a9 SO |
259 | mutex_unlock(&cp->lock); |
260 | } else | |
e6b6e10a PO |
261 | error = -EINVAL; |
262 | ||
263 | return error < 0 ? error : count; | |
e6b6e10a PO |
264 | } |
265 | ||
266 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); | |
267 | ||
e5854a58 PO |
268 | static ssize_t chp_configure_show(struct device *dev, |
269 | struct device_attribute *attr, char *buf) | |
270 | { | |
271 | struct channel_path *cp; | |
272 | int status; | |
273 | ||
05469607 | 274 | cp = to_channelpath(dev); |
e5854a58 PO |
275 | status = chp_info_get_status(cp->chpid); |
276 | if (status < 0) | |
277 | return status; | |
278 | ||
4b9e0436 | 279 | return sysfs_emit(buf, "%d\n", status); |
e5854a58 PO |
280 | } |
281 | ||
282 | static int cfg_wait_idle(void); | |
283 | ||
284 | static ssize_t chp_configure_write(struct device *dev, | |
285 | struct device_attribute *attr, | |
286 | const char *buf, size_t count) | |
287 | { | |
288 | struct channel_path *cp; | |
289 | int val; | |
290 | char delim; | |
291 | ||
292 | if (sscanf(buf, "%d %c", &val, &delim) != 1) | |
293 | return -EINVAL; | |
294 | if (val != 0 && val != 1) | |
295 | return -EINVAL; | |
05469607 | 296 | cp = to_channelpath(dev); |
e5854a58 PO |
297 | chp_cfg_schedule(cp->chpid, val); |
298 | cfg_wait_idle(); | |
299 | ||
300 | return count; | |
301 | } | |
302 | ||
303 | static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); | |
304 | ||
e6b6e10a PO |
305 | static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
306 | char *buf) | |
307 | { | |
05469607 | 308 | struct channel_path *chp = to_channelpath(dev); |
b730f3a9 | 309 | u8 type; |
e6b6e10a | 310 | |
b730f3a9 SO |
311 | mutex_lock(&chp->lock); |
312 | type = chp->desc.desc; | |
313 | mutex_unlock(&chp->lock); | |
314 | return sprintf(buf, "%x\n", type); | |
e6b6e10a PO |
315 | } |
316 | ||
317 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); | |
318 | ||
319 | static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, | |
320 | char *buf) | |
321 | { | |
322 | struct channel_path *chp = to_channelpath(dev); | |
323 | ||
324 | if (!chp) | |
325 | return 0; | |
326 | if (chp->cmg == -1) /* channel measurements not available */ | |
327 | return sprintf(buf, "unknown\n"); | |
f48781d2 | 328 | return sprintf(buf, "%d\n", chp->cmg); |
e6b6e10a PO |
329 | } |
330 | ||
331 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); | |
332 | ||
333 | static ssize_t chp_shared_show(struct device *dev, | |
334 | struct device_attribute *attr, char *buf) | |
335 | { | |
336 | struct channel_path *chp = to_channelpath(dev); | |
337 | ||
338 | if (!chp) | |
339 | return 0; | |
340 | if (chp->shared == -1) /* channel measurements not available */ | |
341 | return sprintf(buf, "unknown\n"); | |
342 | return sprintf(buf, "%x\n", chp->shared); | |
343 | } | |
344 | ||
345 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); | |
346 | ||
ba54229d PO |
347 | static ssize_t chp_chid_show(struct device *dev, struct device_attribute *attr, |
348 | char *buf) | |
349 | { | |
350 | struct channel_path *chp = to_channelpath(dev); | |
351 | ssize_t rc; | |
352 | ||
353 | mutex_lock(&chp->lock); | |
354 | if (chp->desc_fmt1.flags & 0x10) | |
355 | rc = sprintf(buf, "%04x\n", chp->desc_fmt1.chid); | |
356 | else | |
357 | rc = 0; | |
358 | mutex_unlock(&chp->lock); | |
359 | ||
360 | return rc; | |
361 | } | |
362 | static DEVICE_ATTR(chid, 0444, chp_chid_show, NULL); | |
363 | ||
364 | static ssize_t chp_chid_external_show(struct device *dev, | |
365 | struct device_attribute *attr, char *buf) | |
366 | { | |
367 | struct channel_path *chp = to_channelpath(dev); | |
368 | ssize_t rc; | |
369 | ||
370 | mutex_lock(&chp->lock); | |
371 | if (chp->desc_fmt1.flags & 0x10) | |
372 | rc = sprintf(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0); | |
373 | else | |
374 | rc = 0; | |
375 | mutex_unlock(&chp->lock); | |
376 | ||
377 | return rc; | |
378 | } | |
379 | static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL); | |
380 | ||
8b8b0915 SO |
381 | static ssize_t chp_esc_show(struct device *dev, |
382 | struct device_attribute *attr, char *buf) | |
383 | { | |
384 | struct channel_path *chp = to_channelpath(dev); | |
385 | ssize_t rc; | |
386 | ||
387 | mutex_lock(&chp->lock); | |
388 | rc = sprintf(buf, "%x\n", chp->desc_fmt1.esc); | |
389 | mutex_unlock(&chp->lock); | |
390 | ||
391 | return rc; | |
392 | } | |
393 | static DEVICE_ATTR(esc, 0444, chp_esc_show, NULL); | |
394 | ||
0f987e6c PO |
395 | static char apply_max_suffix(unsigned long *value, unsigned long base) |
396 | { | |
397 | static char suffixes[] = { 0, 'K', 'M', 'G', 'T' }; | |
398 | int i; | |
399 | ||
400 | for (i = 0; i < ARRAY_SIZE(suffixes) - 1; i++) { | |
401 | if (*value < base || *value % base != 0) | |
402 | break; | |
403 | *value /= base; | |
404 | } | |
405 | ||
406 | return suffixes[i]; | |
407 | } | |
408 | ||
409 | static ssize_t speed_bps_show(struct device *dev, | |
410 | struct device_attribute *attr, char *buf) | |
411 | { | |
412 | struct channel_path *chp = to_channelpath(dev); | |
413 | unsigned long speed = chp->speed; | |
414 | char suffix; | |
415 | ||
416 | suffix = apply_max_suffix(&speed, 1000); | |
417 | ||
418 | return suffix ? sysfs_emit(buf, "%lu%c\n", speed, suffix) : | |
419 | sysfs_emit(buf, "%lu\n", speed); | |
420 | } | |
421 | ||
422 | static DEVICE_ATTR_RO(speed_bps); | |
423 | ||
b9dd6524 SO |
424 | static ssize_t util_string_read(struct file *filp, struct kobject *kobj, |
425 | struct bin_attribute *attr, char *buf, | |
426 | loff_t off, size_t count) | |
427 | { | |
428 | struct channel_path *chp = to_channelpath(kobj_to_dev(kobj)); | |
429 | ssize_t rc; | |
430 | ||
431 | mutex_lock(&chp->lock); | |
432 | rc = memory_read_from_buffer(buf, count, &off, chp->desc_fmt3.util_str, | |
433 | sizeof(chp->desc_fmt3.util_str)); | |
434 | mutex_unlock(&chp->lock); | |
435 | ||
436 | return rc; | |
437 | } | |
438 | static BIN_ATTR_RO(util_string, | |
439 | sizeof(((struct channel_path_desc_fmt3 *)0)->util_str)); | |
440 | ||
441 | static struct bin_attribute *chp_bin_attrs[] = { | |
442 | &bin_attr_util_string, | |
443 | NULL, | |
444 | }; | |
445 | ||
a0ea22c3 | 446 | static struct attribute *chp_attrs[] = { |
e6b6e10a | 447 | &dev_attr_status.attr, |
e5854a58 | 448 | &dev_attr_configure.attr, |
e6b6e10a PO |
449 | &dev_attr_type.attr, |
450 | &dev_attr_cmg.attr, | |
451 | &dev_attr_shared.attr, | |
ba54229d PO |
452 | &dev_attr_chid.attr, |
453 | &dev_attr_chid_external.attr, | |
8b8b0915 | 454 | &dev_attr_esc.attr, |
0f987e6c | 455 | &dev_attr_speed_bps.attr, |
e6b6e10a PO |
456 | NULL, |
457 | }; | |
e6b6e10a PO |
458 | static struct attribute_group chp_attr_group = { |
459 | .attrs = chp_attrs, | |
b9dd6524 | 460 | .bin_attrs = chp_bin_attrs, |
e6b6e10a | 461 | }; |
ed35ba9a SO |
462 | static const struct attribute_group *chp_attr_groups[] = { |
463 | &chp_attr_group, | |
464 | NULL, | |
465 | }; | |
e6b6e10a PO |
466 | |
467 | static void chp_release(struct device *dev) | |
468 | { | |
469 | struct channel_path *cp; | |
470 | ||
05469607 | 471 | cp = to_channelpath(dev); |
e6b6e10a PO |
472 | kfree(cp); |
473 | } | |
474 | ||
cce0eacc PO |
475 | /** |
476 | * chp_update_desc - update channel-path description | |
364e3f90 | 477 | * @chp: channel-path |
cce0eacc | 478 | * |
9f3d6d7a SO |
479 | * Update the channel-path description of the specified channel-path |
480 | * including channel measurement related information. | |
cce0eacc PO |
481 | * Return zero on success, non-zero otherwise. |
482 | */ | |
483 | int chp_update_desc(struct channel_path *chp) | |
484 | { | |
485 | int rc; | |
486 | ||
ded27d8d | 487 | rc = chsc_determine_fmt0_channel_path_desc(chp->chpid, &chp->desc); |
cce0eacc PO |
488 | if (rc) |
489 | return rc; | |
490 | ||
0b601373 SO |
491 | /* |
492 | * Fetching the following data is optional. Not all machines or | |
493 | * hypervisors implement the required chsc commands. | |
494 | */ | |
495 | chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1); | |
fcc6dd4b | 496 | chsc_determine_fmt3_channel_path_desc(chp->chpid, &chp->desc_fmt3); |
0b601373 | 497 | chsc_get_channel_measurement_chars(chp); |
cce0eacc | 498 | |
0b601373 | 499 | return 0; |
cce0eacc PO |
500 | } |
501 | ||
e6b6e10a PO |
502 | /** |
503 | * chp_new - register a new channel-path | |
364e3f90 | 504 | * @chpid: channel-path ID |
e6b6e10a PO |
505 | * |
506 | * Create and register data structure representing new channel-path. Return | |
507 | * zero on success, non-zero otherwise. | |
508 | */ | |
509 | int chp_new(struct chp_id chpid) | |
510 | { | |
98cc43ab | 511 | struct channel_subsystem *css = css_by_id(chpid.cssid); |
e6b6e10a | 512 | struct channel_path *chp; |
87dc8a01 | 513 | int ret = 0; |
e6b6e10a | 514 | |
87dc8a01 | 515 | mutex_lock(&css->mutex); |
e5854a58 | 516 | if (chp_is_registered(chpid)) |
87dc8a01 | 517 | goto out; |
e6b6e10a | 518 | |
87dc8a01 SO |
519 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
520 | if (!chp) { | |
521 | ret = -ENOMEM; | |
522 | goto out; | |
523 | } | |
e6b6e10a PO |
524 | /* fill in status, etc. */ |
525 | chp->chpid = chpid; | |
526 | chp->state = 1; | |
98cc43ab | 527 | chp->dev.parent = &css->device; |
ed35ba9a | 528 | chp->dev.groups = chp_attr_groups; |
e6b6e10a | 529 | chp->dev.release = chp_release; |
b730f3a9 | 530 | mutex_init(&chp->lock); |
e6b6e10a PO |
531 | |
532 | /* Obtain channel path description and fill it in. */ | |
cce0eacc | 533 | ret = chp_update_desc(chp); |
e6b6e10a PO |
534 | if (ret) |
535 | goto out_free; | |
c9182e0f PO |
536 | if ((chp->desc.flags & 0x80) == 0) { |
537 | ret = -ENODEV; | |
538 | goto out_free; | |
539 | } | |
ec004407 | 540 | dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); |
e6b6e10a PO |
541 | |
542 | /* make it known to the system */ | |
543 | ret = device_register(&chp->dev); | |
544 | if (ret) { | |
e556bbbd CH |
545 | CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
546 | chpid.cssid, chpid.id, ret); | |
c6304933 SO |
547 | put_device(&chp->dev); |
548 | goto out; | |
e6b6e10a | 549 | } |
87dc8a01 | 550 | |
98cc43ab | 551 | if (css->cm_enabled) { |
e6b6e10a PO |
552 | ret = chp_add_cmg_attr(chp); |
553 | if (ret) { | |
e6b6e10a | 554 | device_unregister(&chp->dev); |
a2164b81 | 555 | goto out; |
e6b6e10a PO |
556 | } |
557 | } | |
98cc43ab | 558 | css->chps[chpid.id] = chp; |
a2164b81 | 559 | goto out; |
e6b6e10a PO |
560 | out_free: |
561 | kfree(chp); | |
a2164b81 | 562 | out: |
87dc8a01 | 563 | mutex_unlock(&css->mutex); |
e6b6e10a PO |
564 | return ret; |
565 | } | |
566 | ||
567 | /** | |
568 | * chp_get_chp_desc - return newly allocated channel-path description | |
569 | * @chpid: channel-path ID | |
570 | * | |
571 | * On success return a newly allocated copy of the channel-path description | |
572 | * data associated with the given channel-path ID. Return %NULL on error. | |
573 | */ | |
ded27d8d | 574 | struct channel_path_desc_fmt0 *chp_get_chp_desc(struct chp_id chpid) |
e6b6e10a PO |
575 | { |
576 | struct channel_path *chp; | |
ded27d8d | 577 | struct channel_path_desc_fmt0 *desc; |
e6b6e10a PO |
578 | |
579 | chp = chpid_to_chp(chpid); | |
580 | if (!chp) | |
581 | return NULL; | |
ded27d8d | 582 | desc = kmalloc(sizeof(*desc), GFP_KERNEL); |
e6b6e10a PO |
583 | if (!desc) |
584 | return NULL; | |
b730f3a9 SO |
585 | |
586 | mutex_lock(&chp->lock); | |
ded27d8d | 587 | memcpy(desc, &chp->desc, sizeof(*desc)); |
b730f3a9 | 588 | mutex_unlock(&chp->lock); |
e6b6e10a PO |
589 | return desc; |
590 | } | |
591 | ||
592 | /** | |
593 | * chp_process_crw - process channel-path status change | |
c1156189 CH |
594 | * @crw0: channel report-word to handler |
595 | * @crw1: second channel-report word (always NULL) | |
596 | * @overflow: crw overflow indication | |
e6b6e10a PO |
597 | * |
598 | * Handle channel-report-words indicating that the status of a channel-path | |
599 | * has changed. | |
600 | */ | |
c1156189 CH |
601 | static void chp_process_crw(struct crw *crw0, struct crw *crw1, |
602 | int overflow) | |
e6b6e10a PO |
603 | { |
604 | struct chp_id chpid; | |
605 | ||
c1156189 CH |
606 | if (overflow) { |
607 | css_schedule_eval_all(); | |
608 | return; | |
609 | } | |
610 | CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " | |
611 | "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", | |
612 | crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, | |
613 | crw0->erc, crw0->rsid); | |
614 | /* | |
615 | * Check for solicited machine checks. These are | |
616 | * created by reset channel path and need not be | |
617 | * handled here. | |
618 | */ | |
619 | if (crw0->slct) { | |
620 | CIO_CRW_EVENT(2, "solicited machine check for " | |
621 | "channel path %02X\n", crw0->rsid); | |
622 | return; | |
623 | } | |
e6b6e10a | 624 | chp_id_init(&chpid); |
c1156189 CH |
625 | chpid.id = crw0->rsid; |
626 | switch (crw0->erc) { | |
627 | case CRW_ERC_IPARM: /* Path has come. */ | |
2daace78 | 628 | case CRW_ERC_INIT: |
87dc8a01 | 629 | chp_new(chpid); |
83b3370c | 630 | chsc_chp_online(chpid); |
c1156189 CH |
631 | break; |
632 | case CRW_ERC_PERRI: /* Path has gone. */ | |
633 | case CRW_ERC_PERRN: | |
e6b6e10a | 634 | chsc_chp_offline(chpid); |
c1156189 CH |
635 | break; |
636 | default: | |
637 | CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", | |
638 | crw0->erc); | |
639 | } | |
e6b6e10a | 640 | } |
e5854a58 | 641 | |
99611f87 | 642 | int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) |
c820de39 CH |
643 | { |
644 | int i; | |
645 | int mask; | |
646 | ||
647 | for (i = 0; i < 8; i++) { | |
648 | mask = 0x80 >> i; | |
649 | if (!(ssd->path_mask & mask)) | |
650 | continue; | |
99611f87 | 651 | if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) |
c820de39 CH |
652 | continue; |
653 | if ((ssd->fla_valid_mask & mask) && | |
99611f87 | 654 | ((ssd->fla[i] & link->fla_mask) != link->fla)) |
c820de39 CH |
655 | continue; |
656 | return mask; | |
657 | } | |
658 | return 0; | |
659 | } | |
660 | EXPORT_SYMBOL_GPL(chp_ssd_get_mask); | |
661 | ||
e5854a58 PO |
662 | static inline int info_bit_num(struct chp_id id) |
663 | { | |
664 | return id.id + id.cssid * (__MAX_CHPID + 1); | |
665 | } | |
666 | ||
667 | /* Force chp_info refresh on next call to info_validate(). */ | |
668 | static void info_expire(void) | |
669 | { | |
670 | mutex_lock(&info_lock); | |
671 | chp_info_expires = jiffies - 1; | |
672 | mutex_unlock(&info_lock); | |
673 | } | |
674 | ||
675 | /* Ensure that chp_info is up-to-date. */ | |
676 | static int info_update(void) | |
677 | { | |
678 | int rc; | |
679 | ||
680 | mutex_lock(&info_lock); | |
681 | rc = 0; | |
682 | if (time_after(jiffies, chp_info_expires)) { | |
683 | /* Data is too old, update. */ | |
684 | rc = sclp_chp_read_info(&chp_info); | |
685 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; | |
686 | } | |
687 | mutex_unlock(&info_lock); | |
688 | ||
689 | return rc; | |
690 | } | |
691 | ||
692 | /** | |
693 | * chp_info_get_status - retrieve configure status of a channel-path | |
694 | * @chpid: channel-path ID | |
695 | * | |
696 | * On success, return 0 for standby, 1 for configured, 2 for reserved, | |
697 | * 3 for not recognized. Return negative error code on error. | |
698 | */ | |
699 | int chp_info_get_status(struct chp_id chpid) | |
700 | { | |
701 | int rc; | |
702 | int bit; | |
703 | ||
704 | rc = info_update(); | |
705 | if (rc) | |
706 | return rc; | |
707 | ||
708 | bit = info_bit_num(chpid); | |
709 | mutex_lock(&info_lock); | |
710 | if (!chp_test_bit(chp_info.recognized, bit)) | |
711 | rc = CHP_STATUS_NOT_RECOGNIZED; | |
712 | else if (chp_test_bit(chp_info.configured, bit)) | |
713 | rc = CHP_STATUS_CONFIGURED; | |
714 | else if (chp_test_bit(chp_info.standby, bit)) | |
715 | rc = CHP_STATUS_STANDBY; | |
716 | else | |
717 | rc = CHP_STATUS_RESERVED; | |
718 | mutex_unlock(&info_lock); | |
719 | ||
720 | return rc; | |
721 | } | |
722 | ||
723 | /* Return configure task for chpid. */ | |
724 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) | |
725 | { | |
726 | return chp_cfg_task[chpid.cssid][chpid.id]; | |
727 | } | |
728 | ||
729 | /* Set configure task for chpid. */ | |
730 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) | |
731 | { | |
732 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; | |
733 | } | |
734 | ||
4475aeb8 SO |
735 | /* Fetch the first configure task. Set chpid accordingly. */ |
736 | static enum cfg_task_t chp_cfg_fetch_task(struct chp_id *chpid) | |
737 | { | |
738 | enum cfg_task_t t = cfg_none; | |
739 | ||
740 | chp_id_for_each(chpid) { | |
741 | t = cfg_get_task(*chpid); | |
742 | if (t != cfg_none) | |
743 | break; | |
744 | } | |
745 | ||
746 | return t; | |
747 | } | |
748 | ||
e5854a58 PO |
749 | /* Perform one configure/deconfigure request. Reschedule work function until |
750 | * last request. */ | |
751 | static void cfg_func(struct work_struct *work) | |
752 | { | |
753 | struct chp_id chpid; | |
754 | enum cfg_task_t t; | |
683c5418 | 755 | int rc; |
e5854a58 | 756 | |
837c5220 | 757 | spin_lock(&cfg_lock); |
4475aeb8 | 758 | t = chp_cfg_fetch_task(&chpid); |
837c5220 | 759 | spin_unlock(&cfg_lock); |
e5854a58 PO |
760 | |
761 | switch (t) { | |
762 | case cfg_configure: | |
683c5418 PO |
763 | rc = sclp_chp_configure(chpid); |
764 | if (rc) | |
765 | CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" | |
766 | "%d\n", chpid.cssid, chpid.id, rc); | |
767 | else { | |
768 | info_expire(); | |
769 | chsc_chp_online(chpid); | |
770 | } | |
e5854a58 PO |
771 | break; |
772 | case cfg_deconfigure: | |
683c5418 PO |
773 | rc = sclp_chp_deconfigure(chpid); |
774 | if (rc) | |
775 | CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" | |
776 | "%d\n", chpid.cssid, chpid.id, rc); | |
777 | else { | |
778 | info_expire(); | |
779 | chsc_chp_offline(chpid); | |
780 | } | |
e5854a58 PO |
781 | break; |
782 | case cfg_none: | |
783 | /* Get updated information after last change. */ | |
784 | info_update(); | |
e5854a58 PO |
785 | wake_up_interruptible(&cfg_wait_queue); |
786 | return; | |
787 | } | |
4475aeb8 SO |
788 | spin_lock(&cfg_lock); |
789 | if (t == cfg_get_task(chpid)) | |
790 | cfg_set_task(chpid, cfg_none); | |
791 | spin_unlock(&cfg_lock); | |
7b1058bc | 792 | schedule_work(&cfg_work); |
e5854a58 PO |
793 | } |
794 | ||
795 | /** | |
796 | * chp_cfg_schedule - schedule chpid configuration request | |
364e3f90 SO |
797 | * @chpid: channel-path ID |
798 | * @configure: Non-zero for configure, zero for deconfigure | |
e5854a58 PO |
799 | * |
800 | * Schedule a channel-path configuration/deconfiguration request. | |
801 | */ | |
802 | void chp_cfg_schedule(struct chp_id chpid, int configure) | |
803 | { | |
804 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, | |
805 | configure); | |
837c5220 | 806 | spin_lock(&cfg_lock); |
e5854a58 | 807 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); |
837c5220 | 808 | spin_unlock(&cfg_lock); |
7b1058bc | 809 | schedule_work(&cfg_work); |
e5854a58 PO |
810 | } |
811 | ||
812 | /** | |
813 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request | |
364e3f90 | 814 | * @chpid: channel-path ID |
e5854a58 PO |
815 | * |
816 | * Cancel an active channel-path deconfiguration request if it has not yet | |
817 | * been performed. | |
818 | */ | |
819 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) | |
820 | { | |
821 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); | |
837c5220 | 822 | spin_lock(&cfg_lock); |
e5854a58 PO |
823 | if (cfg_get_task(chpid) == cfg_deconfigure) |
824 | cfg_set_task(chpid, cfg_none); | |
837c5220 | 825 | spin_unlock(&cfg_lock); |
e5854a58 PO |
826 | } |
827 | ||
4475aeb8 SO |
828 | static bool cfg_idle(void) |
829 | { | |
830 | struct chp_id chpid; | |
831 | enum cfg_task_t t; | |
832 | ||
833 | spin_lock(&cfg_lock); | |
834 | t = chp_cfg_fetch_task(&chpid); | |
835 | spin_unlock(&cfg_lock); | |
836 | ||
837 | return t == cfg_none; | |
838 | } | |
839 | ||
e5854a58 PO |
840 | static int cfg_wait_idle(void) |
841 | { | |
4475aeb8 | 842 | if (wait_event_interruptible(cfg_wait_queue, cfg_idle())) |
e5854a58 PO |
843 | return -ERESTARTSYS; |
844 | return 0; | |
845 | } | |
846 | ||
847 | static int __init chp_init(void) | |
848 | { | |
849 | struct chp_id chpid; | |
179a98cb | 850 | int state, ret; |
e5854a58 | 851 | |
f5daba1d | 852 | ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); |
c1156189 CH |
853 | if (ret) |
854 | return ret; | |
e5854a58 | 855 | INIT_WORK(&cfg_work, cfg_func); |
e5854a58 PO |
856 | if (info_update()) |
857 | return 0; | |
858 | /* Register available channel-paths. */ | |
859 | chp_id_for_each(&chpid) { | |
179a98cb SO |
860 | state = chp_info_get_status(chpid); |
861 | if (state == CHP_STATUS_CONFIGURED || | |
862 | state == CHP_STATUS_STANDBY) | |
e5854a58 PO |
863 | chp_new(chpid); |
864 | } | |
865 | ||
866 | return 0; | |
867 | } | |
868 | ||
869 | subsys_initcall(chp_init); |