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1/*
2 * file for managing the edac_device subsystem of devices for EDAC
3 *
4 * (C) 2007 SoftwareBitMaker
5 *
6 * This file may be distributed under the terms of the
7 * GNU General Public License.
8 *
9 * Written Doug Thompson <norsk5@xmission.com>
10 *
11 */
12
13#include <linux/ctype.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/edac.h>
17
18#include "edac_device.h"
19#include "edac_module.h"
20
21#define EDAC_DEVICE_SYMLINK "device"
22
23#define to_edacdev(k) container_of(k, struct edac_device_ctl_info, kobj)
24#define to_edacdev_attr(a) container_of(a, struct edacdev_attribute, attr)
25
26
27/*
28 * Set of edac_device_ctl_info attribute store/show functions
29 */
30
31/* 'log_ue' */
32static ssize_t edac_device_ctl_log_ue_show(struct edac_device_ctl_info
33 *ctl_info, char *data)
34{
35 return sprintf(data, "%u\n", ctl_info->log_ue);
36}
37
38static ssize_t edac_device_ctl_log_ue_store(struct edac_device_ctl_info
39 *ctl_info, const char *data,
40 size_t count)
41{
42 /* if parameter is zero, turn off flag, if non-zero turn on flag */
43 ctl_info->log_ue = (simple_strtoul(data, NULL, 0) != 0);
44
45 return count;
46}
47
48/* 'log_ce' */
49static ssize_t edac_device_ctl_log_ce_show(struct edac_device_ctl_info
50 *ctl_info, char *data)
51{
52 return sprintf(data, "%u\n", ctl_info->log_ce);
53}
54
55static ssize_t edac_device_ctl_log_ce_store(struct edac_device_ctl_info
56 *ctl_info, const char *data,
57 size_t count)
58{
59 /* if parameter is zero, turn off flag, if non-zero turn on flag */
60 ctl_info->log_ce = (simple_strtoul(data, NULL, 0) != 0);
61
62 return count;
63}
64
65/* 'panic_on_ue' */
66static ssize_t edac_device_ctl_panic_on_ue_show(struct edac_device_ctl_info
67 *ctl_info, char *data)
68{
69 return sprintf(data, "%u\n", ctl_info->panic_on_ue);
70}
71
72static ssize_t edac_device_ctl_panic_on_ue_store(struct edac_device_ctl_info
73 *ctl_info, const char *data,
74 size_t count)
75{
76 /* if parameter is zero, turn off flag, if non-zero turn on flag */
77 ctl_info->panic_on_ue = (simple_strtoul(data, NULL, 0) != 0);
78
79 return count;
80}
81
82/* 'poll_msec' show and store functions*/
83static ssize_t edac_device_ctl_poll_msec_show(struct edac_device_ctl_info
84 *ctl_info, char *data)
85{
86 return sprintf(data, "%u\n", ctl_info->poll_msec);
87}
88
89static ssize_t edac_device_ctl_poll_msec_store(struct edac_device_ctl_info
90 *ctl_info, const char *data,
91 size_t count)
92{
93 unsigned long value;
94
95 /* get the value and enforce that it is non-zero, must be at least
96 * one millisecond for the delay period, between scans
97 * Then cancel last outstanding delay for the work request
98 * and set a new one.
99 */
100 value = simple_strtoul(data, NULL, 0);
101 edac_device_reset_delay_period(ctl_info, value);
102
103 return count;
104}
105
106/* edac_device_ctl_info specific attribute structure */
107struct ctl_info_attribute {
108 struct attribute attr;
109 ssize_t(*show) (struct edac_device_ctl_info *, char *);
110 ssize_t(*store) (struct edac_device_ctl_info *, const char *, size_t);
111};
112
113#define to_ctl_info(k) container_of(k, struct edac_device_ctl_info, kobj)
114#define to_ctl_info_attr(a) container_of(a,struct ctl_info_attribute,attr)
115
116/* Function to 'show' fields from the edac_dev 'ctl_info' structure */
117static ssize_t edac_dev_ctl_info_show(struct kobject *kobj,
118 struct attribute *attr, char *buffer)
119{
120 struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
121 struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);
122
123 if (ctl_info_attr->show)
124 return ctl_info_attr->show(edac_dev, buffer);
125 return -EIO;
126}
127
128/* Function to 'store' fields into the edac_dev 'ctl_info' structure */
129static ssize_t edac_dev_ctl_info_store(struct kobject *kobj,
130 struct attribute *attr,
131 const char *buffer, size_t count)
132{
133 struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
134 struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);
135
136 if (ctl_info_attr->store)
137 return ctl_info_attr->store(edac_dev, buffer, count);
138 return -EIO;
139}
140
141/* edac_dev file operations for an 'ctl_info' */
142static const struct sysfs_ops device_ctl_info_ops = {
143 .show = edac_dev_ctl_info_show,
144 .store = edac_dev_ctl_info_store
145};
146
147#define CTL_INFO_ATTR(_name,_mode,_show,_store) \
148static struct ctl_info_attribute attr_ctl_info_##_name = { \
149 .attr = {.name = __stringify(_name), .mode = _mode }, \
150 .show = _show, \
151 .store = _store, \
152};
153
154/* Declare the various ctl_info attributes here and their respective ops */
155CTL_INFO_ATTR(log_ue, S_IRUGO | S_IWUSR,
156 edac_device_ctl_log_ue_show, edac_device_ctl_log_ue_store);
157CTL_INFO_ATTR(log_ce, S_IRUGO | S_IWUSR,
158 edac_device_ctl_log_ce_show, edac_device_ctl_log_ce_store);
159CTL_INFO_ATTR(panic_on_ue, S_IRUGO | S_IWUSR,
160 edac_device_ctl_panic_on_ue_show,
161 edac_device_ctl_panic_on_ue_store);
162CTL_INFO_ATTR(poll_msec, S_IRUGO | S_IWUSR,
163 edac_device_ctl_poll_msec_show, edac_device_ctl_poll_msec_store);
164
165/* Base Attributes of the EDAC_DEVICE ECC object */
166static struct attribute *device_ctrl_attrs[] = {
167 &attr_ctl_info_panic_on_ue.attr,
168 &attr_ctl_info_log_ue.attr,
169 &attr_ctl_info_log_ce.attr,
170 &attr_ctl_info_poll_msec.attr,
171 NULL,
172};
173ATTRIBUTE_GROUPS(device_ctrl);
174
175/*
176 * edac_device_ctrl_master_release
177 *
178 * called when the reference count for the 'main' kobj
179 * for a edac_device control struct reaches zero
180 *
181 * Reference count model:
182 * One 'main' kobject for each control structure allocated.
183 * That main kobj is initially set to one AND
184 * the reference count for the EDAC 'core' module is
185 * bumped by one, thus added 'keep in memory' dependency.
186 *
187 * Each new internal kobj (in instances and blocks) then
188 * bumps the 'main' kobject.
189 *
190 * When they are released their release functions decrement
191 * the 'main' kobj.
192 *
193 * When the main kobj reaches zero (0) then THIS function
194 * is called which then decrements the EDAC 'core' module.
195 * When the module reference count reaches zero then the
196 * module no longer has dependency on keeping the release
197 * function code in memory and module can be unloaded.
198 *
199 * This will support several control objects as well, each
200 * with its own 'main' kobj.
201 */
202static void edac_device_ctrl_master_release(struct kobject *kobj)
203{
204 struct edac_device_ctl_info *edac_dev = to_edacdev(kobj);
205
206 edac_dbg(4, "control index=%d\n", edac_dev->dev_idx);
207
208 /* decrement the EDAC CORE module ref count */
209 module_put(edac_dev->owner);
210
211 __edac_device_free_ctl_info(edac_dev);
212}
213
214/* ktype for the main (master) kobject */
215static struct kobj_type ktype_device_ctrl = {
216 .release = edac_device_ctrl_master_release,
217 .sysfs_ops = &device_ctl_info_ops,
218 .default_groups = device_ctrl_groups,
219};
220
221/*
222 * edac_device_register_sysfs_main_kobj
223 *
224 * perform the high level setup for the new edac_device instance
225 *
226 * Return: 0 SUCCESS
227 * !0 FAILURE
228 */
229int edac_device_register_sysfs_main_kobj(struct edac_device_ctl_info *edac_dev)
230{
231 struct device *dev_root;
232 const struct bus_type *edac_subsys;
233 int err = -ENODEV;
234
235 edac_dbg(1, "\n");
236
237 /* get the /sys/devices/system/edac reference */
238 edac_subsys = edac_get_sysfs_subsys();
239
240 /* Point to the 'edac_subsys' this instance 'reports' to */
241 edac_dev->edac_subsys = edac_subsys;
242
243 /* Init the devices's kobject */
244 memset(&edac_dev->kobj, 0, sizeof(struct kobject));
245
246 /* Record which module 'owns' this control structure
247 * and bump the ref count of the module
248 */
249 edac_dev->owner = THIS_MODULE;
250
251 if (!try_module_get(edac_dev->owner))
252 goto err_out;
253
254 /* register */
255 dev_root = bus_get_dev_root(edac_subsys);
256 if (dev_root) {
257 err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
258 &dev_root->kobj, "%s", edac_dev->name);
259 put_device(dev_root);
260 }
261 if (err) {
262 edac_dbg(1, "Failed to register '.../edac/%s'\n",
263 edac_dev->name);
264 goto err_kobj_reg;
265 }
266 kobject_uevent(&edac_dev->kobj, KOBJ_ADD);
267
268 /* At this point, to 'free' the control struct,
269 * edac_device_unregister_sysfs_main_kobj() must be used
270 */
271
272 edac_dbg(4, "Registered '.../edac/%s' kobject\n", edac_dev->name);
273
274 return 0;
275
276 /* Error exit stack */
277err_kobj_reg:
278 kobject_put(&edac_dev->kobj);
279 module_put(edac_dev->owner);
280
281err_out:
282 return err;
283}
284
285/*
286 * edac_device_unregister_sysfs_main_kobj:
287 * the '..../edac/<name>' kobject
288 */
289void edac_device_unregister_sysfs_main_kobj(struct edac_device_ctl_info *dev)
290{
291 edac_dbg(0, "\n");
292 edac_dbg(4, "name of kobject is: %s\n", kobject_name(&dev->kobj));
293
294 /*
295 * Unregister the edac device's kobject and
296 * allow for reference count to reach 0 at which point
297 * the callback will be called to:
298 * a) module_put() this module
299 * b) 'kfree' the memory
300 */
301 kobject_put(&dev->kobj);
302}
303
304/* edac_dev -> instance information */
305
306/*
307 * Set of low-level instance attribute show functions
308 */
309static ssize_t instance_ue_count_show(struct edac_device_instance *instance,
310 char *data)
311{
312 return sprintf(data, "%u\n", instance->counters.ue_count);
313}
314
315static ssize_t instance_ce_count_show(struct edac_device_instance *instance,
316 char *data)
317{
318 return sprintf(data, "%u\n", instance->counters.ce_count);
319}
320
321#define to_instance(k) container_of(k, struct edac_device_instance, kobj)
322#define to_instance_attr(a) container_of(a,struct instance_attribute,attr)
323
324/* DEVICE instance kobject release() function */
325static void edac_device_ctrl_instance_release(struct kobject *kobj)
326{
327 struct edac_device_instance *instance;
328
329 edac_dbg(1, "\n");
330
331 /* map from this kobj to the main control struct
332 * and then dec the main kobj count
333 */
334 instance = to_instance(kobj);
335 kobject_put(&instance->ctl->kobj);
336}
337
338/* instance specific attribute structure */
339struct instance_attribute {
340 struct attribute attr;
341 ssize_t(*show) (struct edac_device_instance *, char *);
342 ssize_t(*store) (struct edac_device_instance *, const char *, size_t);
343};
344
345/* Function to 'show' fields from the edac_dev 'instance' structure */
346static ssize_t edac_dev_instance_show(struct kobject *kobj,
347 struct attribute *attr, char *buffer)
348{
349 struct edac_device_instance *instance = to_instance(kobj);
350 struct instance_attribute *instance_attr = to_instance_attr(attr);
351
352 if (instance_attr->show)
353 return instance_attr->show(instance, buffer);
354 return -EIO;
355}
356
357/* Function to 'store' fields into the edac_dev 'instance' structure */
358static ssize_t edac_dev_instance_store(struct kobject *kobj,
359 struct attribute *attr,
360 const char *buffer, size_t count)
361{
362 struct edac_device_instance *instance = to_instance(kobj);
363 struct instance_attribute *instance_attr = to_instance_attr(attr);
364
365 if (instance_attr->store)
366 return instance_attr->store(instance, buffer, count);
367 return -EIO;
368}
369
370/* edac_dev file operations for an 'instance' */
371static const struct sysfs_ops device_instance_ops = {
372 .show = edac_dev_instance_show,
373 .store = edac_dev_instance_store
374};
375
376#define INSTANCE_ATTR(_name,_mode,_show,_store) \
377static struct instance_attribute attr_instance_##_name = { \
378 .attr = {.name = __stringify(_name), .mode = _mode }, \
379 .show = _show, \
380 .store = _store, \
381};
382
383/*
384 * Define attributes visible for the edac_device instance object
385 * Each contains a pointer to a show and an optional set
386 * function pointer that does the low level output/input
387 */
388INSTANCE_ATTR(ce_count, S_IRUGO, instance_ce_count_show, NULL);
389INSTANCE_ATTR(ue_count, S_IRUGO, instance_ue_count_show, NULL);
390
391/* list of edac_dev 'instance' attributes */
392static struct attribute *device_instance_attrs[] = {
393 &attr_instance_ce_count.attr,
394 &attr_instance_ue_count.attr,
395 NULL,
396};
397ATTRIBUTE_GROUPS(device_instance);
398
399/* The 'ktype' for each edac_dev 'instance' */
400static struct kobj_type ktype_instance_ctrl = {
401 .release = edac_device_ctrl_instance_release,
402 .sysfs_ops = &device_instance_ops,
403 .default_groups = device_instance_groups,
404};
405
406/* edac_dev -> instance -> block information */
407
408#define to_block(k) container_of(k, struct edac_device_block, kobj)
409#define to_block_attr(a) \
410 container_of(a, struct edac_dev_sysfs_block_attribute, attr)
411
412/*
413 * Set of low-level block attribute show functions
414 */
415static ssize_t block_ue_count_show(struct kobject *kobj,
416 struct attribute *attr, char *data)
417{
418 struct edac_device_block *block = to_block(kobj);
419
420 return sprintf(data, "%u\n", block->counters.ue_count);
421}
422
423static ssize_t block_ce_count_show(struct kobject *kobj,
424 struct attribute *attr, char *data)
425{
426 struct edac_device_block *block = to_block(kobj);
427
428 return sprintf(data, "%u\n", block->counters.ce_count);
429}
430
431/* DEVICE block kobject release() function */
432static void edac_device_ctrl_block_release(struct kobject *kobj)
433{
434 struct edac_device_block *block;
435
436 edac_dbg(1, "\n");
437
438 /* get the container of the kobj */
439 block = to_block(kobj);
440
441 /* map from 'block kobj' to 'block->instance->controller->main_kobj'
442 * now 'release' the block kobject
443 */
444 kobject_put(&block->instance->ctl->kobj);
445}
446
447
448/* Function to 'show' fields from the edac_dev 'block' structure */
449static ssize_t edac_dev_block_show(struct kobject *kobj,
450 struct attribute *attr, char *buffer)
451{
452 struct edac_dev_sysfs_block_attribute *block_attr =
453 to_block_attr(attr);
454
455 if (block_attr->show)
456 return block_attr->show(kobj, attr, buffer);
457 return -EIO;
458}
459
460/* Function to 'store' fields into the edac_dev 'block' structure */
461static ssize_t edac_dev_block_store(struct kobject *kobj,
462 struct attribute *attr,
463 const char *buffer, size_t count)
464{
465 struct edac_dev_sysfs_block_attribute *block_attr;
466
467 block_attr = to_block_attr(attr);
468
469 if (block_attr->store)
470 return block_attr->store(kobj, attr, buffer, count);
471 return -EIO;
472}
473
474/* edac_dev file operations for a 'block' */
475static const struct sysfs_ops device_block_ops = {
476 .show = edac_dev_block_show,
477 .store = edac_dev_block_store
478};
479
480#define BLOCK_ATTR(_name,_mode,_show,_store) \
481static struct edac_dev_sysfs_block_attribute attr_block_##_name = { \
482 .attr = {.name = __stringify(_name), .mode = _mode }, \
483 .show = _show, \
484 .store = _store, \
485};
486
487BLOCK_ATTR(ce_count, S_IRUGO, block_ce_count_show, NULL);
488BLOCK_ATTR(ue_count, S_IRUGO, block_ue_count_show, NULL);
489
490/* list of edac_dev 'block' attributes */
491static struct attribute *device_block_attrs[] = {
492 &attr_block_ce_count.attr,
493 &attr_block_ue_count.attr,
494 NULL,
495};
496ATTRIBUTE_GROUPS(device_block);
497
498/* The 'ktype' for each edac_dev 'block' */
499static struct kobj_type ktype_block_ctrl = {
500 .release = edac_device_ctrl_block_release,
501 .sysfs_ops = &device_block_ops,
502 .default_groups = device_block_groups,
503};
504
505/* block ctor/dtor code */
506
507/*
508 * edac_device_create_block
509 */
510static int edac_device_create_block(struct edac_device_ctl_info *edac_dev,
511 struct edac_device_instance *instance,
512 struct edac_device_block *block)
513{
514 int i;
515 int err;
516 struct edac_dev_sysfs_block_attribute *sysfs_attrib;
517 struct kobject *main_kobj;
518
519 edac_dbg(4, "Instance '%s' inst_p=%p block '%s' block_p=%p\n",
520 instance->name, instance, block->name, block);
521 edac_dbg(4, "block kobj=%p block kobj->parent=%p\n",
522 &block->kobj, &block->kobj.parent);
523
524 /* init this block's kobject */
525 memset(&block->kobj, 0, sizeof(struct kobject));
526
527 /* bump the main kobject's reference count for this controller
528 * and this instance is dependent on the main
529 */
530 main_kobj = kobject_get(&edac_dev->kobj);
531 if (!main_kobj) {
532 err = -ENODEV;
533 goto err_out;
534 }
535
536 /* Add this block's kobject */
537 err = kobject_init_and_add(&block->kobj, &ktype_block_ctrl,
538 &instance->kobj,
539 "%s", block->name);
540 if (err) {
541 edac_dbg(1, "Failed to register instance '%s'\n", block->name);
542 kobject_put(main_kobj);
543 err = -ENODEV;
544 goto err_out;
545 }
546
547 /* If there are driver level block attributes, then added them
548 * to the block kobject
549 */
550 sysfs_attrib = block->block_attributes;
551 if (sysfs_attrib && block->nr_attribs) {
552 for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {
553
554 edac_dbg(4, "creating block attrib='%s' attrib->%p to kobj=%p\n",
555 sysfs_attrib->attr.name,
556 sysfs_attrib, &block->kobj);
557
558 /* Create each block_attribute file */
559 err = sysfs_create_file(&block->kobj,
560 &sysfs_attrib->attr);
561 if (err)
562 goto err_on_attrib;
563 }
564 }
565 kobject_uevent(&block->kobj, KOBJ_ADD);
566
567 return 0;
568
569 /* Error unwind stack */
570err_on_attrib:
571 kobject_put(&block->kobj);
572
573err_out:
574 return err;
575}
576
577/*
578 * edac_device_delete_block(edac_dev,block);
579 */
580static void edac_device_delete_block(struct edac_device_ctl_info *edac_dev,
581 struct edac_device_block *block)
582{
583 struct edac_dev_sysfs_block_attribute *sysfs_attrib;
584 int i;
585
586 /* if this block has 'attributes' then we need to iterate over the list
587 * and 'remove' the attributes on this block
588 */
589 sysfs_attrib = block->block_attributes;
590 if (sysfs_attrib && block->nr_attribs) {
591 for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {
592
593 /* remove each block_attrib file */
594 sysfs_remove_file(&block->kobj,
595 (struct attribute *) sysfs_attrib);
596 }
597 }
598
599 /* unregister this block's kobject, SEE:
600 * edac_device_ctrl_block_release() callback operation
601 */
602 kobject_put(&block->kobj);
603}
604
605/* instance ctor/dtor code */
606
607/*
608 * edac_device_create_instance
609 * create just one instance of an edac_device 'instance'
610 */
611static int edac_device_create_instance(struct edac_device_ctl_info *edac_dev,
612 int idx)
613{
614 int i, j;
615 int err;
616 struct edac_device_instance *instance;
617 struct kobject *main_kobj;
618
619 instance = &edac_dev->instances[idx];
620
621 /* Init the instance's kobject */
622 memset(&instance->kobj, 0, sizeof(struct kobject));
623
624 instance->ctl = edac_dev;
625
626 /* bump the main kobject's reference count for this controller
627 * and this instance is dependent on the main
628 */
629 main_kobj = kobject_get(&edac_dev->kobj);
630 if (!main_kobj) {
631 err = -ENODEV;
632 goto err_out;
633 }
634
635 /* Formally register this instance's kobject under the edac_device */
636 err = kobject_init_and_add(&instance->kobj, &ktype_instance_ctrl,
637 &edac_dev->kobj, "%s", instance->name);
638 if (err != 0) {
639 edac_dbg(2, "Failed to register instance '%s'\n",
640 instance->name);
641 kobject_put(main_kobj);
642 goto err_out;
643 }
644
645 edac_dbg(4, "now register '%d' blocks for instance %d\n",
646 instance->nr_blocks, idx);
647
648 /* register all blocks of this instance */
649 for (i = 0; i < instance->nr_blocks; i++) {
650 err = edac_device_create_block(edac_dev, instance,
651 &instance->blocks[i]);
652 if (err) {
653 /* If any fail, remove all previous ones */
654 for (j = 0; j < i; j++)
655 edac_device_delete_block(edac_dev,
656 &instance->blocks[j]);
657 goto err_release_instance_kobj;
658 }
659 }
660 kobject_uevent(&instance->kobj, KOBJ_ADD);
661
662 edac_dbg(4, "Registered instance %d '%s' kobject\n",
663 idx, instance->name);
664
665 return 0;
666
667 /* error unwind stack */
668err_release_instance_kobj:
669 kobject_put(&instance->kobj);
670
671err_out:
672 return err;
673}
674
675/*
676 * edac_device_remove_instance
677 * remove an edac_device instance
678 */
679static void edac_device_delete_instance(struct edac_device_ctl_info *edac_dev,
680 int idx)
681{
682 struct edac_device_instance *instance;
683 int i;
684
685 instance = &edac_dev->instances[idx];
686
687 /* unregister all blocks in this instance */
688 for (i = 0; i < instance->nr_blocks; i++)
689 edac_device_delete_block(edac_dev, &instance->blocks[i]);
690
691 /* unregister this instance's kobject, SEE:
692 * edac_device_ctrl_instance_release() for callback operation
693 */
694 kobject_put(&instance->kobj);
695}
696
697/*
698 * edac_device_create_instances
699 * create the first level of 'instances' for this device
700 * (ie 'cache' might have 'cache0', 'cache1', 'cache2', etc
701 */
702static int edac_device_create_instances(struct edac_device_ctl_info *edac_dev)
703{
704 int i, j;
705 int err;
706
707 edac_dbg(0, "\n");
708
709 /* iterate over creation of the instances */
710 for (i = 0; i < edac_dev->nr_instances; i++) {
711 err = edac_device_create_instance(edac_dev, i);
712 if (err) {
713 /* unwind previous instances on error */
714 for (j = 0; j < i; j++)
715 edac_device_delete_instance(edac_dev, j);
716 return err;
717 }
718 }
719
720 return 0;
721}
722
723/*
724 * edac_device_delete_instances(edac_dev);
725 * unregister all the kobjects of the instances
726 */
727static void edac_device_delete_instances(struct edac_device_ctl_info *edac_dev)
728{
729 int i;
730
731 /* iterate over creation of the instances */
732 for (i = 0; i < edac_dev->nr_instances; i++)
733 edac_device_delete_instance(edac_dev, i);
734}
735
736/* edac_dev sysfs ctor/dtor code */
737
738/*
739 * edac_device_add_main_sysfs_attributes
740 * add some attributes to this instance's main kobject
741 */
742static int edac_device_add_main_sysfs_attributes(
743 struct edac_device_ctl_info *edac_dev)
744{
745 struct edac_dev_sysfs_attribute *sysfs_attrib;
746 int err = 0;
747
748 sysfs_attrib = edac_dev->sysfs_attributes;
749 if (sysfs_attrib) {
750 /* iterate over the array and create an attribute for each
751 * entry in the list
752 */
753 while (sysfs_attrib->attr.name != NULL) {
754 err = sysfs_create_file(&edac_dev->kobj,
755 (struct attribute*) sysfs_attrib);
756 if (err)
757 goto err_out;
758
759 sysfs_attrib++;
760 }
761 }
762
763err_out:
764 return err;
765}
766
767/*
768 * edac_device_remove_main_sysfs_attributes
769 * remove any attributes to this instance's main kobject
770 */
771static void edac_device_remove_main_sysfs_attributes(
772 struct edac_device_ctl_info *edac_dev)
773{
774 struct edac_dev_sysfs_attribute *sysfs_attrib;
775
776 /* if there are main attributes, defined, remove them. First,
777 * point to the start of the array and iterate over it
778 * removing each attribute listed from this device's instance's kobject
779 */
780 sysfs_attrib = edac_dev->sysfs_attributes;
781 if (sysfs_attrib) {
782 while (sysfs_attrib->attr.name != NULL) {
783 sysfs_remove_file(&edac_dev->kobj,
784 (struct attribute *) sysfs_attrib);
785 sysfs_attrib++;
786 }
787 }
788}
789
790/*
791 * edac_device_create_sysfs() Constructor
792 *
793 * accept a created edac_device control structure
794 * and 'export' it to sysfs. The 'main' kobj should already have been
795 * created. 'instance' and 'block' kobjects should be registered
796 * along with any 'block' attributes from the low driver. In addition,
797 * the main attributes (if any) are connected to the main kobject of
798 * the control structure.
799 *
800 * Return:
801 * 0 Success
802 * !0 Failure
803 */
804int edac_device_create_sysfs(struct edac_device_ctl_info *edac_dev)
805{
806 int err;
807 struct kobject *edac_kobj = &edac_dev->kobj;
808
809 edac_dbg(0, "idx=%d\n", edac_dev->dev_idx);
810
811 /* go create any main attributes callers wants */
812 err = edac_device_add_main_sysfs_attributes(edac_dev);
813 if (err) {
814 edac_dbg(0, "failed to add sysfs attribs\n");
815 goto err_out;
816 }
817
818 /* create a symlink from the edac device
819 * to the platform 'device' being used for this
820 */
821 err = sysfs_create_link(edac_kobj,
822 &edac_dev->dev->kobj, EDAC_DEVICE_SYMLINK);
823 if (err) {
824 edac_dbg(0, "sysfs_create_link() returned err= %d\n", err);
825 goto err_remove_main_attribs;
826 }
827
828 /* Create the first level instance directories
829 * In turn, the nested blocks beneath the instances will
830 * be registered as well
831 */
832 err = edac_device_create_instances(edac_dev);
833 if (err) {
834 edac_dbg(0, "edac_device_create_instances() returned err= %d\n",
835 err);
836 goto err_remove_link;
837 }
838
839
840 edac_dbg(4, "create-instances done, idx=%d\n", edac_dev->dev_idx);
841
842 return 0;
843
844 /* Error unwind stack */
845err_remove_link:
846 /* remove the sym link */
847 sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);
848
849err_remove_main_attribs:
850 edac_device_remove_main_sysfs_attributes(edac_dev);
851
852err_out:
853 return err;
854}
855
856/*
857 * edac_device_remove_sysfs() destructor
858 *
859 * given an edac_device struct, tear down the kobject resources
860 */
861void edac_device_remove_sysfs(struct edac_device_ctl_info *edac_dev)
862{
863 edac_dbg(0, "\n");
864
865 /* remove any main attributes for this device */
866 edac_device_remove_main_sysfs_attributes(edac_dev);
867
868 /* remove the device sym link */
869 sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);
870
871 /* walk the instance/block kobject tree, deconstructing it */
872 edac_device_delete_instances(edac_dev);
873}