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edac_device_sysfs.c
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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 <[email protected]>
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_core.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' */
32 static 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 
38 static 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' */
49 static 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 
55 static 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' */
66 static 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 
72 static 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*/
83 static 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 
89 static 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 */
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 */
117 static 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 */
129 static 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' */
142 static 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) \
148 static 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 */
155 CTL_INFO_ATTR(log_ue, S_IRUGO | S_IWUSR,
156  edac_device_ctl_log_ue_show, edac_device_ctl_log_ue_store);
157 CTL_INFO_ATTR(log_ce, S_IRUGO | S_IWUSR,
158  edac_device_ctl_log_ce_show, edac_device_ctl_log_ce_store);
159 CTL_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);
162 CTL_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 */
166 static struct ctl_info_attribute *device_ctrl_attr[] = {
167  &attr_ctl_info_panic_on_ue,
168  &attr_ctl_info_log_ue,
169  &attr_ctl_info_log_ce,
170  &attr_ctl_info_poll_msec,
171  NULL,
172 };
173 
174 /*
175  * edac_device_ctrl_master_release
176  *
177  * called when the reference count for the 'main' kobj
178  * for a edac_device control struct reaches zero
179  *
180  * Reference count model:
181  * One 'main' kobject for each control structure allocated.
182  * That main kobj is initially set to one AND
183  * the reference count for the EDAC 'core' module is
184  * bumped by one, thus added 'keep in memory' dependency.
185  *
186  * Each new internal kobj (in instances and blocks) then
187  * bumps the 'main' kobject.
188  *
189  * When they are released their release functions decrement
190  * the 'main' kobj.
191  *
192  * When the main kobj reaches zero (0) then THIS function
193  * is called which then decrements the EDAC 'core' module.
194  * When the module reference count reaches zero then the
195  * module no longer has dependency on keeping the release
196  * function code in memory and module can be unloaded.
197  *
198  * This will support several control objects as well, each
199  * with its own 'main' kobj.
200  */
201 static void edac_device_ctrl_master_release(struct kobject *kobj)
202 {
203  struct edac_device_ctl_info *edac_dev = to_edacdev(kobj);
204 
205  edac_dbg(4, "control index=%d\n", edac_dev->dev_idx);
206 
207  /* decrement the EDAC CORE module ref count */
208  module_put(edac_dev->owner);
209 
210  /* free the control struct containing the 'main' kobj
211  * passed in to this routine
212  */
213  kfree(edac_dev);
214 }
215 
216 /* ktype for the main (master) kobject */
217 static struct kobj_type ktype_device_ctrl = {
218  .release = edac_device_ctrl_master_release,
219  .sysfs_ops = &device_ctl_info_ops,
220  .default_attrs = (struct attribute **)device_ctrl_attr,
221 };
222 
223 /*
224  * edac_device_register_sysfs_main_kobj
225  *
226  * perform the high level setup for the new edac_device instance
227  *
228  * Return: 0 SUCCESS
229  * !0 FAILURE
230  */
232 {
233  struct bus_type *edac_subsys;
234  int err;
235 
236  edac_dbg(1, "\n");
237 
238  /* get the /sys/devices/system/edac reference */
239  edac_subsys = edac_get_sysfs_subsys();
240  if (edac_subsys == NULL) {
241  edac_dbg(1, "no edac_subsys error\n");
242  err = -ENODEV;
243  goto err_out;
244  }
245 
246  /* Point to the 'edac_subsys' this instance 'reports' to */
247  edac_dev->edac_subsys = edac_subsys;
248 
249  /* Init the devices's kobject */
250  memset(&edac_dev->kobj, 0, sizeof(struct kobject));
251 
252  /* Record which module 'owns' this control structure
253  * and bump the ref count of the module
254  */
255  edac_dev->owner = THIS_MODULE;
256 
257  if (!try_module_get(edac_dev->owner)) {
258  err = -ENODEV;
259  goto err_mod_get;
260  }
261 
262  /* register */
263  err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
264  &edac_subsys->dev_root->kobj,
265  "%s", edac_dev->name);
266  if (err) {
267  edac_dbg(1, "Failed to register '.../edac/%s'\n",
268  edac_dev->name);
269  goto err_kobj_reg;
270  }
271  kobject_uevent(&edac_dev->kobj, KOBJ_ADD);
272 
273  /* At this point, to 'free' the control struct,
274  * edac_device_unregister_sysfs_main_kobj() must be used
275  */
276 
277  edac_dbg(4, "Registered '.../edac/%s' kobject\n", edac_dev->name);
278 
279  return 0;
280 
281  /* Error exit stack */
282 err_kobj_reg:
283  module_put(edac_dev->owner);
284 
285 err_mod_get:
287 
288 err_out:
289  return err;
290 }
291 
292 /*
293  * edac_device_unregister_sysfs_main_kobj:
294  * the '..../edac/<name>' kobject
295  */
297 {
298  edac_dbg(0, "\n");
299  edac_dbg(4, "name of kobject is: %s\n", kobject_name(&dev->kobj));
300 
301  /*
302  * Unregister the edac device's kobject and
303  * allow for reference count to reach 0 at which point
304  * the callback will be called to:
305  * a) module_put() this module
306  * b) 'kfree' the memory
307  */
308  kobject_put(&dev->kobj);
310 }
311 
312 /* edac_dev -> instance information */
313 
314 /*
315  * Set of low-level instance attribute show functions
316  */
317 static ssize_t instance_ue_count_show(struct edac_device_instance *instance,
318  char *data)
319 {
320  return sprintf(data, "%u\n", instance->counters.ue_count);
321 }
322 
323 static ssize_t instance_ce_count_show(struct edac_device_instance *instance,
324  char *data)
325 {
326  return sprintf(data, "%u\n", instance->counters.ce_count);
327 }
328 
329 #define to_instance(k) container_of(k, struct edac_device_instance, kobj)
330 #define to_instance_attr(a) container_of(a,struct instance_attribute,attr)
331 
332 /* DEVICE instance kobject release() function */
333 static void edac_device_ctrl_instance_release(struct kobject *kobj)
334 {
335  struct edac_device_instance *instance;
336 
337  edac_dbg(1, "\n");
338 
339  /* map from this kobj to the main control struct
340  * and then dec the main kobj count
341  */
342  instance = to_instance(kobj);
343  kobject_put(&instance->ctl->kobj);
344 }
345 
346 /* instance specific attribute structure */
348  struct attribute attr;
349  ssize_t(*show) (struct edac_device_instance *, char *);
350  ssize_t(*store) (struct edac_device_instance *, const char *, size_t);
351 };
352 
353 /* Function to 'show' fields from the edac_dev 'instance' structure */
354 static ssize_t edac_dev_instance_show(struct kobject *kobj,
355  struct attribute *attr, char *buffer)
356 {
357  struct edac_device_instance *instance = to_instance(kobj);
358  struct instance_attribute *instance_attr = to_instance_attr(attr);
359 
360  if (instance_attr->show)
361  return instance_attr->show(instance, buffer);
362  return -EIO;
363 }
364 
365 /* Function to 'store' fields into the edac_dev 'instance' structure */
366 static ssize_t edac_dev_instance_store(struct kobject *kobj,
367  struct attribute *attr,
368  const char *buffer, size_t count)
369 {
370  struct edac_device_instance *instance = to_instance(kobj);
371  struct instance_attribute *instance_attr = to_instance_attr(attr);
372 
373  if (instance_attr->store)
374  return instance_attr->store(instance, buffer, count);
375  return -EIO;
376 }
377 
378 /* edac_dev file operations for an 'instance' */
379 static const struct sysfs_ops device_instance_ops = {
380  .show = edac_dev_instance_show,
381  .store = edac_dev_instance_store
382 };
383 
384 #define INSTANCE_ATTR(_name,_mode,_show,_store) \
385 static struct instance_attribute attr_instance_##_name = { \
386  .attr = {.name = __stringify(_name), .mode = _mode }, \
387  .show = _show, \
388  .store = _store, \
389 };
390 
391 /*
392  * Define attributes visible for the edac_device instance object
393  * Each contains a pointer to a show and an optional set
394  * function pointer that does the low level output/input
395  */
396 INSTANCE_ATTR(ce_count, S_IRUGO, instance_ce_count_show, NULL);
397 INSTANCE_ATTR(ue_count, S_IRUGO, instance_ue_count_show, NULL);
398 
399 /* list of edac_dev 'instance' attributes */
400 static struct instance_attribute *device_instance_attr[] = {
401  &attr_instance_ce_count,
402  &attr_instance_ue_count,
403  NULL,
404 };
405 
406 /* The 'ktype' for each edac_dev 'instance' */
407 static struct kobj_type ktype_instance_ctrl = {
408  .release = edac_device_ctrl_instance_release,
409  .sysfs_ops = &device_instance_ops,
410  .default_attrs = (struct attribute **)device_instance_attr,
411 };
412 
413 /* edac_dev -> instance -> block information */
414 
415 #define to_block(k) container_of(k, struct edac_device_block, kobj)
416 #define to_block_attr(a) \
417  container_of(a, struct edac_dev_sysfs_block_attribute, attr)
418 
419 /*
420  * Set of low-level block attribute show functions
421  */
422 static ssize_t block_ue_count_show(struct kobject *kobj,
423  struct attribute *attr, char *data)
424 {
425  struct edac_device_block *block = to_block(kobj);
426 
427  return sprintf(data, "%u\n", block->counters.ue_count);
428 }
429 
430 static ssize_t block_ce_count_show(struct kobject *kobj,
431  struct attribute *attr, char *data)
432 {
433  struct edac_device_block *block = to_block(kobj);
434 
435  return sprintf(data, "%u\n", block->counters.ce_count);
436 }
437 
438 /* DEVICE block kobject release() function */
439 static void edac_device_ctrl_block_release(struct kobject *kobj)
440 {
441  struct edac_device_block *block;
442 
443  edac_dbg(1, "\n");
444 
445  /* get the container of the kobj */
446  block = to_block(kobj);
447 
448  /* map from 'block kobj' to 'block->instance->controller->main_kobj'
449  * now 'release' the block kobject
450  */
451  kobject_put(&block->instance->ctl->kobj);
452 }
453 
454 
455 /* Function to 'show' fields from the edac_dev 'block' structure */
456 static ssize_t edac_dev_block_show(struct kobject *kobj,
457  struct attribute *attr, char *buffer)
458 {
459  struct edac_dev_sysfs_block_attribute *block_attr =
460  to_block_attr(attr);
461 
462  if (block_attr->show)
463  return block_attr->show(kobj, attr, buffer);
464  return -EIO;
465 }
466 
467 /* Function to 'store' fields into the edac_dev 'block' structure */
468 static ssize_t edac_dev_block_store(struct kobject *kobj,
469  struct attribute *attr,
470  const char *buffer, size_t count)
471 {
472  struct edac_dev_sysfs_block_attribute *block_attr;
473 
474  block_attr = to_block_attr(attr);
475 
476  if (block_attr->store)
477  return block_attr->store(kobj, attr, buffer, count);
478  return -EIO;
479 }
480 
481 /* edac_dev file operations for a 'block' */
482 static const struct sysfs_ops device_block_ops = {
483  .show = edac_dev_block_show,
484  .store = edac_dev_block_store
485 };
486 
487 #define BLOCK_ATTR(_name,_mode,_show,_store) \
488 static struct edac_dev_sysfs_block_attribute attr_block_##_name = { \
489  .attr = {.name = __stringify(_name), .mode = _mode }, \
490  .show = _show, \
491  .store = _store, \
492 };
493 
494 BLOCK_ATTR(ce_count, S_IRUGO, block_ce_count_show, NULL);
495 BLOCK_ATTR(ue_count, S_IRUGO, block_ue_count_show, NULL);
496 
497 /* list of edac_dev 'block' attributes */
498 static struct edac_dev_sysfs_block_attribute *device_block_attr[] = {
499  &attr_block_ce_count,
500  &attr_block_ue_count,
501  NULL,
502 };
503 
504 /* The 'ktype' for each edac_dev 'block' */
505 static struct kobj_type ktype_block_ctrl = {
506  .release = edac_device_ctrl_block_release,
507  .sysfs_ops = &device_block_ops,
508  .default_attrs = (struct attribute **)device_block_attr,
509 };
510 
511 /* block ctor/dtor code */
512 
513 /*
514  * edac_device_create_block
515  */
516 static int edac_device_create_block(struct edac_device_ctl_info *edac_dev,
517  struct edac_device_instance *instance,
518  struct edac_device_block *block)
519 {
520  int i;
521  int err;
522  struct edac_dev_sysfs_block_attribute *sysfs_attrib;
523  struct kobject *main_kobj;
524 
525  edac_dbg(4, "Instance '%s' inst_p=%p block '%s' block_p=%p\n",
526  instance->name, instance, block->name, block);
527  edac_dbg(4, "block kobj=%p block kobj->parent=%p\n",
528  &block->kobj, &block->kobj.parent);
529 
530  /* init this block's kobject */
531  memset(&block->kobj, 0, sizeof(struct kobject));
532 
533  /* bump the main kobject's reference count for this controller
534  * and this instance is dependent on the main
535  */
536  main_kobj = kobject_get(&edac_dev->kobj);
537  if (!main_kobj) {
538  err = -ENODEV;
539  goto err_out;
540  }
541 
542  /* Add this block's kobject */
543  err = kobject_init_and_add(&block->kobj, &ktype_block_ctrl,
544  &instance->kobj,
545  "%s", block->name);
546  if (err) {
547  edac_dbg(1, "Failed to register instance '%s'\n", block->name);
548  kobject_put(main_kobj);
549  err = -ENODEV;
550  goto err_out;
551  }
552 
553  /* If there are driver level block attributes, then added them
554  * to the block kobject
555  */
556  sysfs_attrib = block->block_attributes;
557  if (sysfs_attrib && block->nr_attribs) {
558  for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {
559 
560  edac_dbg(4, "creating block attrib='%s' attrib->%p to kobj=%p\n",
561  sysfs_attrib->attr.name,
562  sysfs_attrib, &block->kobj);
563 
564  /* Create each block_attribute file */
565  err = sysfs_create_file(&block->kobj,
566  &sysfs_attrib->attr);
567  if (err)
568  goto err_on_attrib;
569  }
570  }
571  kobject_uevent(&block->kobj, KOBJ_ADD);
572 
573  return 0;
574 
575  /* Error unwind stack */
576 err_on_attrib:
577  kobject_put(&block->kobj);
578 
579 err_out:
580  return err;
581 }
582 
583 /*
584  * edac_device_delete_block(edac_dev,block);
585  */
586 static void edac_device_delete_block(struct edac_device_ctl_info *edac_dev,
587  struct edac_device_block *block)
588 {
589  struct edac_dev_sysfs_block_attribute *sysfs_attrib;
590  int i;
591 
592  /* if this block has 'attributes' then we need to iterate over the list
593  * and 'remove' the attributes on this block
594  */
595  sysfs_attrib = block->block_attributes;
596  if (sysfs_attrib && block->nr_attribs) {
597  for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {
598 
599  /* remove each block_attrib file */
600  sysfs_remove_file(&block->kobj,
601  (struct attribute *) sysfs_attrib);
602  }
603  }
604 
605  /* unregister this block's kobject, SEE:
606  * edac_device_ctrl_block_release() callback operation
607  */
608  kobject_put(&block->kobj);
609 }
610 
611 /* instance ctor/dtor code */
612 
613 /*
614  * edac_device_create_instance
615  * create just one instance of an edac_device 'instance'
616  */
617 static int edac_device_create_instance(struct edac_device_ctl_info *edac_dev,
618  int idx)
619 {
620  int i, j;
621  int err;
622  struct edac_device_instance *instance;
623  struct kobject *main_kobj;
624 
625  instance = &edac_dev->instances[idx];
626 
627  /* Init the instance's kobject */
628  memset(&instance->kobj, 0, sizeof(struct kobject));
629 
630  instance->ctl = edac_dev;
631 
632  /* bump the main kobject's reference count for this controller
633  * and this instance is dependent on the main
634  */
635  main_kobj = kobject_get(&edac_dev->kobj);
636  if (!main_kobj) {
637  err = -ENODEV;
638  goto err_out;
639  }
640 
641  /* Formally register this instance's kobject under the edac_device */
642  err = kobject_init_and_add(&instance->kobj, &ktype_instance_ctrl,
643  &edac_dev->kobj, "%s", instance->name);
644  if (err != 0) {
645  edac_dbg(2, "Failed to register instance '%s'\n",
646  instance->name);
647  kobject_put(main_kobj);
648  goto err_out;
649  }
650 
651  edac_dbg(4, "now register '%d' blocks for instance %d\n",
652  instance->nr_blocks, idx);
653 
654  /* register all blocks of this instance */
655  for (i = 0; i < instance->nr_blocks; i++) {
656  err = edac_device_create_block(edac_dev, instance,
657  &instance->blocks[i]);
658  if (err) {
659  /* If any fail, remove all previous ones */
660  for (j = 0; j < i; j++)
661  edac_device_delete_block(edac_dev,
662  &instance->blocks[j]);
663  goto err_release_instance_kobj;
664  }
665  }
666  kobject_uevent(&instance->kobj, KOBJ_ADD);
667 
668  edac_dbg(4, "Registered instance %d '%s' kobject\n",
669  idx, instance->name);
670 
671  return 0;
672 
673  /* error unwind stack */
674 err_release_instance_kobj:
675  kobject_put(&instance->kobj);
676 
677 err_out:
678  return err;
679 }
680 
681 /*
682  * edac_device_remove_instance
683  * remove an edac_device instance
684  */
685 static void edac_device_delete_instance(struct edac_device_ctl_info *edac_dev,
686  int idx)
687 {
688  struct edac_device_instance *instance;
689  int i;
690 
691  instance = &edac_dev->instances[idx];
692 
693  /* unregister all blocks in this instance */
694  for (i = 0; i < instance->nr_blocks; i++)
695  edac_device_delete_block(edac_dev, &instance->blocks[i]);
696 
697  /* unregister this instance's kobject, SEE:
698  * edac_device_ctrl_instance_release() for callback operation
699  */
700  kobject_put(&instance->kobj);
701 }
702 
703 /*
704  * edac_device_create_instances
705  * create the first level of 'instances' for this device
706  * (ie 'cache' might have 'cache0', 'cache1', 'cache2', etc
707  */
708 static int edac_device_create_instances(struct edac_device_ctl_info *edac_dev)
709 {
710  int i, j;
711  int err;
712 
713  edac_dbg(0, "\n");
714 
715  /* iterate over creation of the instances */
716  for (i = 0; i < edac_dev->nr_instances; i++) {
717  err = edac_device_create_instance(edac_dev, i);
718  if (err) {
719  /* unwind previous instances on error */
720  for (j = 0; j < i; j++)
721  edac_device_delete_instance(edac_dev, j);
722  return err;
723  }
724  }
725 
726  return 0;
727 }
728 
729 /*
730  * edac_device_delete_instances(edac_dev);
731  * unregister all the kobjects of the instances
732  */
733 static void edac_device_delete_instances(struct edac_device_ctl_info *edac_dev)
734 {
735  int i;
736 
737  /* iterate over creation of the instances */
738  for (i = 0; i < edac_dev->nr_instances; i++)
739  edac_device_delete_instance(edac_dev, i);
740 }
741 
742 /* edac_dev sysfs ctor/dtor code */
743 
744 /*
745  * edac_device_add_main_sysfs_attributes
746  * add some attributes to this instance's main kobject
747  */
748 static int edac_device_add_main_sysfs_attributes(
749  struct edac_device_ctl_info *edac_dev)
750 {
751  struct edac_dev_sysfs_attribute *sysfs_attrib;
752  int err = 0;
753 
754  sysfs_attrib = edac_dev->sysfs_attributes;
755  if (sysfs_attrib) {
756  /* iterate over the array and create an attribute for each
757  * entry in the list
758  */
759  while (sysfs_attrib->attr.name != NULL) {
760  err = sysfs_create_file(&edac_dev->kobj,
761  (struct attribute*) sysfs_attrib);
762  if (err)
763  goto err_out;
764 
765  sysfs_attrib++;
766  }
767  }
768 
769 err_out:
770  return err;
771 }
772 
773 /*
774  * edac_device_remove_main_sysfs_attributes
775  * remove any attributes to this instance's main kobject
776  */
777 static void edac_device_remove_main_sysfs_attributes(
778  struct edac_device_ctl_info *edac_dev)
779 {
780  struct edac_dev_sysfs_attribute *sysfs_attrib;
781 
782  /* if there are main attributes, defined, remove them. First,
783  * point to the start of the array and iterate over it
784  * removing each attribute listed from this device's instance's kobject
785  */
786  sysfs_attrib = edac_dev->sysfs_attributes;
787  if (sysfs_attrib) {
788  while (sysfs_attrib->attr.name != NULL) {
789  sysfs_remove_file(&edac_dev->kobj,
790  (struct attribute *) sysfs_attrib);
791  sysfs_attrib++;
792  }
793  }
794 }
795 
796 /*
797  * edac_device_create_sysfs() Constructor
798  *
799  * accept a created edac_device control structure
800  * and 'export' it to sysfs. The 'main' kobj should already have been
801  * created. 'instance' and 'block' kobjects should be registered
802  * along with any 'block' attributes from the low driver. In addition,
803  * the main attributes (if any) are connected to the main kobject of
804  * the control structure.
805  *
806  * Return:
807  * 0 Success
808  * !0 Failure
809  */
811 {
812  int err;
813  struct kobject *edac_kobj = &edac_dev->kobj;
814 
815  edac_dbg(0, "idx=%d\n", edac_dev->dev_idx);
816 
817  /* go create any main attributes callers wants */
818  err = edac_device_add_main_sysfs_attributes(edac_dev);
819  if (err) {
820  edac_dbg(0, "failed to add sysfs attribs\n");
821  goto err_out;
822  }
823 
824  /* create a symlink from the edac device
825  * to the platform 'device' being used for this
826  */
827  err = sysfs_create_link(edac_kobj,
828  &edac_dev->dev->kobj, EDAC_DEVICE_SYMLINK);
829  if (err) {
830  edac_dbg(0, "sysfs_create_link() returned err= %d\n", err);
831  goto err_remove_main_attribs;
832  }
833 
834  /* Create the first level instance directories
835  * In turn, the nested blocks beneath the instances will
836  * be registered as well
837  */
838  err = edac_device_create_instances(edac_dev);
839  if (err) {
840  edac_dbg(0, "edac_device_create_instances() returned err= %d\n",
841  err);
842  goto err_remove_link;
843  }
844 
845 
846  edac_dbg(4, "create-instances done, idx=%d\n", edac_dev->dev_idx);
847 
848  return 0;
849 
850  /* Error unwind stack */
851 err_remove_link:
852  /* remove the sym link */
854 
855 err_remove_main_attribs:
856  edac_device_remove_main_sysfs_attributes(edac_dev);
857 
858 err_out:
859  return err;
860 }
861 
862 /*
863  * edac_device_remove_sysfs() destructor
864  *
865  * given an edac_device struct, tear down the kobject resources
866  */
868 {
869  edac_dbg(0, "\n");
870 
871  /* remove any main attributes for this device */
872  edac_device_remove_main_sysfs_attributes(edac_dev);
873 
874  /* remove the device sym link */
876 
877  /* walk the instance/block kobject tree, deconstructing it */
878  edac_device_delete_instances(edac_dev);
879 }