blob: c692dfebd0bab1c808f460349dff194b028f5c5c [file] [log] [blame]
Peter Oberparleitere6b6e102007-04-27 16:01:28 +02001/*
Heiko Carstensa53c8fa2012-07-20 11:15:04 +02002 * Copyright IBM Corp. 1999, 2010
Peter Oberparleitere6b6e102007-04-27 16:01:28 +02003 * 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>
Heiko Carstens3a4c5d52011-07-30 09:25:15 +020011#include <linux/export.h>
12#include <linux/sched.h>
Peter Oberparleitere5854a52007-04-27 16:01:31 +020013#include <linux/init.h>
14#include <linux/jiffies.h>
15#include <linux/wait.h>
16#include <linux/mutex.h>
Cornelia Hucka0ea22c32007-10-12 16:11:19 +020017#include <linux/errno.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Peter Oberparleitere5854a52007-04-27 16:01:31 +020019#include <asm/chpid.h>
20#include <asm/sclp.h>
Heiko Carstensf5daba12009-03-26 15:24:01 +010021#include <asm/crw.h>
Peter Oberparleitere6b6e102007-04-27 16:01:28 +020022
Peter Oberparleitere6b6e102007-04-27 16:01:28 +020023#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)
Peter Oberparleitere5854a52007-04-27 16:01:31 +020030#define CHP_INFO_UPDATE_INTERVAL 1*HZ
31
32enum cfg_task_t {
33 cfg_none,
34 cfg_configure,
35 cfg_deconfigure
36};
37
38/* Map for pending configure tasks. */
39static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1];
40static DEFINE_MUTEX(cfg_lock);
41static int cfg_busy;
42
43/* Map for channel-path status. */
44static struct sclp_chp_info chp_info;
45static DEFINE_MUTEX(info_lock);
46
47/* Time after which channel-path status may be outdated. */
48static unsigned long chp_info_expires;
49
50/* Workqueue to perform pending configure tasks. */
51static struct workqueue_struct *chp_wq;
52static struct work_struct cfg_work;
53
54/* Wait queue for configure completion events. */
55static wait_queue_head_t cfg_wait_queue;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +020056
Peter Oberparleitere6b6e102007-04-27 16:01:28 +020057/* Set vary state for given chpid. */
58static void set_chp_logically_online(struct chp_id chpid, int onoff)
59{
60 chpid_to_chp(chpid)->state = onoff;
61}
62
André Goddard Rosaaf901ca2009-11-14 13:09:05 -020063/* On success return 0 if channel-path is varied offline, 1 if it is varied
Peter Oberparleitere6b6e102007-04-27 16:01:28 +020064 * online. Return -ENODEV if channel-path is not registered. */
65int 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 */
77u8 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);
Cornelia Hucka0ea22c32007-10-12 16:11:19 +020085 for (i = 0; i < 8; i++) {
Peter Oberparleitere6b6e102007-04-27 16:01:28 +020086 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}
Cornelia Huck44a1c192008-07-14 09:58:47 +020093EXPORT_SYMBOL_GPL(chp_get_sch_opm);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +020094
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 */
102int 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 */
111static 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);
Cornelia Hucka0ea22c32007-10-12 16:11:19 +0200118 CIO_TRACE_EVENT(2, dbf_text);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200119
120 status = chp_get_status(chpid);
Michael Ernstc78aa6c2008-07-14 09:59:22 +0200121 if (!on && !status)
122 return 0;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200123
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 */
Chris Wright2c3c8be2010-05-12 18:28:57 -0700132static ssize_t chp_measurement_chars_read(struct file *filp,
133 struct kobject *kobj,
Zhang Rui91a69022007-06-09 13:57:22 +0800134 struct bin_attribute *bin_attr,
135 char *buf, loff_t off, size_t count)
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200136{
137 struct channel_path *chp;
Heiko Carstens364c8552007-10-12 16:11:35 +0200138 struct device *device;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200139
Heiko Carstens364c8552007-10-12 16:11:35 +0200140 device = container_of(kobj, struct device, kobj);
141 chp = to_channelpath(device);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200142 if (!chp->cmg_chars)
143 return 0;
144
Akinobu Mitad9cef212008-07-14 09:59:15 +0200145 return memory_read_from_buffer(buf, count, &off,
146 chp->cmg_chars, sizeof(struct cmg_chars));
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200147}
148
149static struct bin_attribute chp_measurement_chars_attr = {
150 .attr = {
151 .name = "measurement_chars",
152 .mode = S_IRUSR,
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200153 },
154 .size = sizeof(struct cmg_chars),
155 .read = chp_measurement_chars_read,
156};
157
158static 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
Chris Wright2c3c8be2010-05-12 18:28:57 -0700180static ssize_t chp_measurement_read(struct file *filp, struct kobject *kobj,
Zhang Rui91a69022007-06-09 13:57:22 +0800181 struct bin_attribute *bin_attr,
182 char *buf, loff_t off, size_t count)
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200183{
184 struct channel_path *chp;
185 struct channel_subsystem *css;
Heiko Carstens364c8552007-10-12 16:11:35 +0200186 struct device *device;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200187 unsigned int size;
188
Heiko Carstens364c8552007-10-12 16:11:35 +0200189 device = container_of(kobj, struct device, kobj);
190 chp = to_channelpath(device);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200191 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
203static struct bin_attribute chp_measurement_attr = {
204 .attr = {
205 .name = "measurement",
206 .mode = S_IRUSR,
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200207 },
208 .size = sizeof(struct cmg_entry),
209 .read = chp_measurement_read,
210};
211
212void 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
218int 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 */
234static ssize_t chp_status_show(struct device *dev,
235 struct device_attribute *attr, char *buf)
236{
Cornelia Huck05469602007-10-22 12:52:40 +0200237 struct channel_path *chp = to_channelpath(dev);
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200238 int status;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200239
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200240 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");
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200245}
246
247static ssize_t chp_status_write(struct device *dev,
248 struct device_attribute *attr,
249 const char *buf, size_t count)
250{
Cornelia Huck05469602007-10-22 12:52:40 +0200251 struct channel_path *cp = to_channelpath(dev);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200252 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
Rasmus Villemoes3f8bfd92014-10-13 15:54:57 -0700260 if (!strncasecmp(cmd, "on", 2) || !strcmp(cmd, "1")) {
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200261 mutex_lock(&cp->lock);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200262 error = s390_vary_chpid(cp->chpid, 1);
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200263 mutex_unlock(&cp->lock);
Rasmus Villemoes3f8bfd92014-10-13 15:54:57 -0700264 } else if (!strncasecmp(cmd, "off", 3) || !strcmp(cmd, "0")) {
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200265 mutex_lock(&cp->lock);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200266 error = s390_vary_chpid(cp->chpid, 0);
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200267 mutex_unlock(&cp->lock);
268 } else
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200269 error = -EINVAL;
270
271 return error < 0 ? error : count;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200272}
273
274static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
275
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200276static 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
Cornelia Huck05469602007-10-22 12:52:40 +0200282 cp = to_channelpath(dev);
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200283 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
290static int cfg_wait_idle(void);
291
292static 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;
Cornelia Huck05469602007-10-22 12:52:40 +0200304 cp = to_channelpath(dev);
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200305 chp_cfg_schedule(cp->chpid, val);
306 cfg_wait_idle();
307
308 return count;
309}
310
311static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write);
312
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200313static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr,
314 char *buf)
315{
Cornelia Huck05469602007-10-22 12:52:40 +0200316 struct channel_path *chp = to_channelpath(dev);
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200317 u8 type;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200318
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200319 mutex_lock(&chp->lock);
320 type = chp->desc.desc;
321 mutex_unlock(&chp->lock);
322 return sprintf(buf, "%x\n", type);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200323}
324
325static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
326
327static 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
339static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);
340
341static 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
353static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);
354
Peter Oberparleiterba542292013-05-15 13:43:29 +0200355static ssize_t chp_chid_show(struct device *dev, struct device_attribute *attr,
356 char *buf)
357{
358 struct channel_path *chp = to_channelpath(dev);
359 ssize_t rc;
360
361 mutex_lock(&chp->lock);
362 if (chp->desc_fmt1.flags & 0x10)
363 rc = sprintf(buf, "%04x\n", chp->desc_fmt1.chid);
364 else
365 rc = 0;
366 mutex_unlock(&chp->lock);
367
368 return rc;
369}
370static DEVICE_ATTR(chid, 0444, chp_chid_show, NULL);
371
372static ssize_t chp_chid_external_show(struct device *dev,
373 struct device_attribute *attr, char *buf)
374{
375 struct channel_path *chp = to_channelpath(dev);
376 ssize_t rc;
377
378 mutex_lock(&chp->lock);
379 if (chp->desc_fmt1.flags & 0x10)
380 rc = sprintf(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0);
381 else
382 rc = 0;
383 mutex_unlock(&chp->lock);
384
385 return rc;
386}
387static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL);
388
Cornelia Hucka0ea22c32007-10-12 16:11:19 +0200389static struct attribute *chp_attrs[] = {
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200390 &dev_attr_status.attr,
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200391 &dev_attr_configure.attr,
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200392 &dev_attr_type.attr,
393 &dev_attr_cmg.attr,
394 &dev_attr_shared.attr,
Peter Oberparleiterba542292013-05-15 13:43:29 +0200395 &dev_attr_chid.attr,
396 &dev_attr_chid_external.attr,
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200397 NULL,
398};
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200399static struct attribute_group chp_attr_group = {
400 .attrs = chp_attrs,
401};
Sebastian Otted35ba92012-06-04 19:29:41 +0200402static const struct attribute_group *chp_attr_groups[] = {
403 &chp_attr_group,
404 NULL,
405};
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200406
407static void chp_release(struct device *dev)
408{
409 struct channel_path *cp;
410
Cornelia Huck05469602007-10-22 12:52:40 +0200411 cp = to_channelpath(dev);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200412 kfree(cp);
413}
414
415/**
Peter Oberparleitercce0eac2013-03-11 12:58:18 +0100416 * chp_update_desc - update channel-path description
417 * @chp - channel-path
418 *
419 * Update the channel-path description of the specified channel-path.
420 * Return zero on success, non-zero otherwise.
421 */
422int chp_update_desc(struct channel_path *chp)
423{
424 int rc;
425
426 rc = chsc_determine_base_channel_path_desc(chp->chpid, &chp->desc);
427 if (rc)
428 return rc;
429
430 rc = chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1);
431
432 return rc;
433}
434
435/**
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200436 * chp_new - register a new channel-path
437 * @chpid - channel-path ID
438 *
439 * Create and register data structure representing new channel-path. Return
440 * zero on success, non-zero otherwise.
441 */
442int chp_new(struct chp_id chpid)
443{
444 struct channel_path *chp;
445 int ret;
446
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200447 if (chp_is_registered(chpid))
448 return 0;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200449 chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
450 if (!chp)
451 return -ENOMEM;
452
453 /* fill in status, etc. */
454 chp->chpid = chpid;
455 chp->state = 1;
Cornelia Huck7c9f4e32007-10-12 16:11:13 +0200456 chp->dev.parent = &channel_subsystems[chpid.cssid]->device;
Sebastian Otted35ba92012-06-04 19:29:41 +0200457 chp->dev.groups = chp_attr_groups;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200458 chp->dev.release = chp_release;
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200459 mutex_init(&chp->lock);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200460
461 /* Obtain channel path description and fill it in. */
Peter Oberparleitercce0eac2013-03-11 12:58:18 +0100462 ret = chp_update_desc(chp);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200463 if (ret)
464 goto out_free;
Peter Oberparleiterc9182e02007-04-27 16:01:29 +0200465 if ((chp->desc.flags & 0x80) == 0) {
466 ret = -ENODEV;
467 goto out_free;
468 }
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200469 /* Get channel-measurement characteristics. */
Cornelia Huck75784c02008-07-14 09:58:57 +0200470 if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) {
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200471 ret = chsc_get_channel_measurement_chars(chp);
472 if (ret)
473 goto out_free;
474 } else {
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200475 chp->cmg = -1;
476 }
Michael Ernstec004402009-10-06 10:33:59 +0200477 dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200478
479 /* make it known to the system */
480 ret = device_register(&chp->dev);
481 if (ret) {
Cornelia Hucke556bbb2007-07-27 12:29:19 +0200482 CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n",
483 chpid.cssid, chpid.id, ret);
Sebastian Ottc6304932009-09-11 10:28:38 +0200484 put_device(&chp->dev);
485 goto out;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200486 }
Cornelia Huck7c9f4e32007-10-12 16:11:13 +0200487 mutex_lock(&channel_subsystems[chpid.cssid]->mutex);
488 if (channel_subsystems[chpid.cssid]->cm_enabled) {
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200489 ret = chp_add_cmg_attr(chp);
490 if (ret) {
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200491 device_unregister(&chp->dev);
Cornelia Huck7c9f4e32007-10-12 16:11:13 +0200492 mutex_unlock(&channel_subsystems[chpid.cssid]->mutex);
Cornelia Hucka2164b82008-09-09 12:38:57 +0200493 goto out;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200494 }
495 }
Cornelia Huck7c9f4e32007-10-12 16:11:13 +0200496 channel_subsystems[chpid.cssid]->chps[chpid.id] = chp;
497 mutex_unlock(&channel_subsystems[chpid.cssid]->mutex);
Cornelia Hucka2164b82008-09-09 12:38:57 +0200498 goto out;
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200499out_free:
500 kfree(chp);
Cornelia Hucka2164b82008-09-09 12:38:57 +0200501out:
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200502 return ret;
503}
504
505/**
506 * chp_get_chp_desc - return newly allocated channel-path description
507 * @chpid: channel-path ID
508 *
509 * On success return a newly allocated copy of the channel-path description
510 * data associated with the given channel-path ID. Return %NULL on error.
511 */
Sebastian Ott2bf29df2014-05-07 13:27:21 +0200512struct channel_path_desc *chp_get_chp_desc(struct chp_id chpid)
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200513{
514 struct channel_path *chp;
515 struct channel_path_desc *desc;
516
517 chp = chpid_to_chp(chpid);
518 if (!chp)
519 return NULL;
520 desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
521 if (!desc)
522 return NULL;
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200523
524 mutex_lock(&chp->lock);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200525 memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
Sebastian Ottb730f3a2010-10-25 16:10:27 +0200526 mutex_unlock(&chp->lock);
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200527 return desc;
528}
529
530/**
531 * chp_process_crw - process channel-path status change
Cornelia Huckc1156182008-07-14 09:58:46 +0200532 * @crw0: channel report-word to handler
533 * @crw1: second channel-report word (always NULL)
534 * @overflow: crw overflow indication
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200535 *
536 * Handle channel-report-words indicating that the status of a channel-path
537 * has changed.
538 */
Cornelia Huckc1156182008-07-14 09:58:46 +0200539static void chp_process_crw(struct crw *crw0, struct crw *crw1,
540 int overflow)
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200541{
542 struct chp_id chpid;
543
Cornelia Huckc1156182008-07-14 09:58:46 +0200544 if (overflow) {
545 css_schedule_eval_all();
546 return;
547 }
548 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
549 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
550 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
551 crw0->erc, crw0->rsid);
552 /*
553 * Check for solicited machine checks. These are
554 * created by reset channel path and need not be
555 * handled here.
556 */
557 if (crw0->slct) {
558 CIO_CRW_EVENT(2, "solicited machine check for "
559 "channel path %02X\n", crw0->rsid);
560 return;
561 }
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200562 chp_id_init(&chpid);
Cornelia Huckc1156182008-07-14 09:58:46 +0200563 chpid.id = crw0->rsid;
564 switch (crw0->erc) {
565 case CRW_ERC_IPARM: /* Path has come. */
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200566 if (!chp_is_registered(chpid))
567 chp_new(chpid);
Peter Oberparleiter83b33702007-04-27 16:01:34 +0200568 chsc_chp_online(chpid);
Cornelia Huckc1156182008-07-14 09:58:46 +0200569 break;
570 case CRW_ERC_PERRI: /* Path has gone. */
571 case CRW_ERC_PERRN:
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200572 chsc_chp_offline(chpid);
Cornelia Huckc1156182008-07-14 09:58:46 +0200573 break;
574 default:
575 CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n",
576 crw0->erc);
577 }
Peter Oberparleitere6b6e102007-04-27 16:01:28 +0200578}
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200579
Cornelia Huck99611f82008-07-14 09:59:02 +0200580int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link)
Cornelia Huckc820de32008-07-14 09:58:45 +0200581{
582 int i;
583 int mask;
584
585 for (i = 0; i < 8; i++) {
586 mask = 0x80 >> i;
587 if (!(ssd->path_mask & mask))
588 continue;
Cornelia Huck99611f82008-07-14 09:59:02 +0200589 if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid))
Cornelia Huckc820de32008-07-14 09:58:45 +0200590 continue;
591 if ((ssd->fla_valid_mask & mask) &&
Cornelia Huck99611f82008-07-14 09:59:02 +0200592 ((ssd->fla[i] & link->fla_mask) != link->fla))
Cornelia Huckc820de32008-07-14 09:58:45 +0200593 continue;
594 return mask;
595 }
596 return 0;
597}
598EXPORT_SYMBOL_GPL(chp_ssd_get_mask);
599
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200600static inline int info_bit_num(struct chp_id id)
601{
602 return id.id + id.cssid * (__MAX_CHPID + 1);
603}
604
605/* Force chp_info refresh on next call to info_validate(). */
606static void info_expire(void)
607{
608 mutex_lock(&info_lock);
609 chp_info_expires = jiffies - 1;
610 mutex_unlock(&info_lock);
611}
612
613/* Ensure that chp_info is up-to-date. */
614static int info_update(void)
615{
616 int rc;
617
618 mutex_lock(&info_lock);
619 rc = 0;
620 if (time_after(jiffies, chp_info_expires)) {
621 /* Data is too old, update. */
622 rc = sclp_chp_read_info(&chp_info);
623 chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ;
624 }
625 mutex_unlock(&info_lock);
626
627 return rc;
628}
629
630/**
631 * chp_info_get_status - retrieve configure status of a channel-path
632 * @chpid: channel-path ID
633 *
634 * On success, return 0 for standby, 1 for configured, 2 for reserved,
635 * 3 for not recognized. Return negative error code on error.
636 */
637int chp_info_get_status(struct chp_id chpid)
638{
639 int rc;
640 int bit;
641
642 rc = info_update();
643 if (rc)
644 return rc;
645
646 bit = info_bit_num(chpid);
647 mutex_lock(&info_lock);
648 if (!chp_test_bit(chp_info.recognized, bit))
649 rc = CHP_STATUS_NOT_RECOGNIZED;
650 else if (chp_test_bit(chp_info.configured, bit))
651 rc = CHP_STATUS_CONFIGURED;
652 else if (chp_test_bit(chp_info.standby, bit))
653 rc = CHP_STATUS_STANDBY;
654 else
655 rc = CHP_STATUS_RESERVED;
656 mutex_unlock(&info_lock);
657
658 return rc;
659}
660
661/* Return configure task for chpid. */
662static enum cfg_task_t cfg_get_task(struct chp_id chpid)
663{
664 return chp_cfg_task[chpid.cssid][chpid.id];
665}
666
667/* Set configure task for chpid. */
668static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg)
669{
670 chp_cfg_task[chpid.cssid][chpid.id] = cfg;
671}
672
673/* Perform one configure/deconfigure request. Reschedule work function until
674 * last request. */
675static void cfg_func(struct work_struct *work)
676{
677 struct chp_id chpid;
678 enum cfg_task_t t;
Peter Oberparleiter683c5412008-07-14 09:59:04 +0200679 int rc;
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200680
681 mutex_lock(&cfg_lock);
682 t = cfg_none;
683 chp_id_for_each(&chpid) {
684 t = cfg_get_task(chpid);
685 if (t != cfg_none) {
686 cfg_set_task(chpid, cfg_none);
687 break;
688 }
689 }
690 mutex_unlock(&cfg_lock);
691
692 switch (t) {
693 case cfg_configure:
Peter Oberparleiter683c5412008-07-14 09:59:04 +0200694 rc = sclp_chp_configure(chpid);
695 if (rc)
696 CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)="
697 "%d\n", chpid.cssid, chpid.id, rc);
698 else {
699 info_expire();
700 chsc_chp_online(chpid);
701 }
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200702 break;
703 case cfg_deconfigure:
Peter Oberparleiter683c5412008-07-14 09:59:04 +0200704 rc = sclp_chp_deconfigure(chpid);
705 if (rc)
706 CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)="
707 "%d\n", chpid.cssid, chpid.id, rc);
708 else {
709 info_expire();
710 chsc_chp_offline(chpid);
711 }
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200712 break;
713 case cfg_none:
714 /* Get updated information after last change. */
715 info_update();
716 mutex_lock(&cfg_lock);
717 cfg_busy = 0;
718 mutex_unlock(&cfg_lock);
719 wake_up_interruptible(&cfg_wait_queue);
720 return;
721 }
722 queue_work(chp_wq, &cfg_work);
723}
724
725/**
726 * chp_cfg_schedule - schedule chpid configuration request
727 * @chpid - channel-path ID
728 * @configure - Non-zero for configure, zero for deconfigure
729 *
730 * Schedule a channel-path configuration/deconfiguration request.
731 */
732void chp_cfg_schedule(struct chp_id chpid, int configure)
733{
734 CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id,
735 configure);
736 mutex_lock(&cfg_lock);
737 cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure);
738 cfg_busy = 1;
739 mutex_unlock(&cfg_lock);
740 queue_work(chp_wq, &cfg_work);
741}
742
743/**
744 * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request
745 * @chpid - channel-path ID
746 *
747 * Cancel an active channel-path deconfiguration request if it has not yet
748 * been performed.
749 */
750void chp_cfg_cancel_deconfigure(struct chp_id chpid)
751{
752 CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id);
753 mutex_lock(&cfg_lock);
754 if (cfg_get_task(chpid) == cfg_deconfigure)
755 cfg_set_task(chpid, cfg_none);
756 mutex_unlock(&cfg_lock);
757}
758
759static int cfg_wait_idle(void)
760{
761 if (wait_event_interruptible(cfg_wait_queue, !cfg_busy))
762 return -ERESTARTSYS;
763 return 0;
764}
765
766static int __init chp_init(void)
767{
768 struct chp_id chpid;
Cornelia Huckc1156182008-07-14 09:58:46 +0200769 int ret;
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200770
Heiko Carstensf5daba12009-03-26 15:24:01 +0100771 ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw);
Cornelia Huckc1156182008-07-14 09:58:46 +0200772 if (ret)
773 return ret;
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200774 chp_wq = create_singlethread_workqueue("cio_chp");
Cornelia Huckc1156182008-07-14 09:58:46 +0200775 if (!chp_wq) {
Heiko Carstensf5daba12009-03-26 15:24:01 +0100776 crw_unregister_handler(CRW_RSC_CPATH);
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200777 return -ENOMEM;
Cornelia Huckc1156182008-07-14 09:58:46 +0200778 }
Peter Oberparleitere5854a52007-04-27 16:01:31 +0200779 INIT_WORK(&cfg_work, cfg_func);
780 init_waitqueue_head(&cfg_wait_queue);
781 if (info_update())
782 return 0;
783 /* Register available channel-paths. */
784 chp_id_for_each(&chpid) {
785 if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED)
786 chp_new(chpid);
787 }
788
789 return 0;
790}
791
792subsys_initcall(chp_init);