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1
2/*
3 * edac_device.c
4 * (C) 2007 www.douglaskthompson.com
5 *
6 * This file may be distributed under the terms of the
7 * GNU General Public License.
8 *
9 * Written by Doug Thompson <norsk5@xmission.com>
10 *
11 * edac_device API implementation
12 * 19 Jan 2007
13 */
14
15#include <asm/page.h>
16#include <linux/uaccess.h>
17#include <linux/ctype.h>
18#include <linux/highmem.h>
19#include <linux/init.h>
20#include <linux/jiffies.h>
21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/smp.h>
24#include <linux/spinlock.h>
25#include <linux/sysctl.h>
26#include <linux/timer.h>
27
28#include "edac_device.h"
29#include "edac_module.h"
30
31/* lock for the list: 'edac_device_list', manipulation of this list
32 * is protected by the 'device_ctls_mutex' lock
33 */
34static DEFINE_MUTEX(device_ctls_mutex);
35static LIST_HEAD(edac_device_list);
36
37/* Default workqueue processing interval on this instance, in msecs */
38#define DEFAULT_POLL_INTERVAL 1000
39
40#ifdef CONFIG_EDAC_DEBUG
41static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev)
42{
43 edac_dbg(3, "\tedac_dev = %p dev_idx=%d\n",
44 edac_dev, edac_dev->dev_idx);
45 edac_dbg(4, "\tedac_dev->edac_check = %p\n", edac_dev->edac_check);
46 edac_dbg(3, "\tdev = %p\n", edac_dev->dev);
47 edac_dbg(3, "\tmod_name:ctl_name = %s:%s\n",
48 edac_dev->mod_name, edac_dev->ctl_name);
49 edac_dbg(3, "\tpvt_info = %p\n\n", edac_dev->pvt_info);
50}
51#endif /* CONFIG_EDAC_DEBUG */
52
53/*
54 * @off_val: zero, 1, or other based offset
55 */
56struct edac_device_ctl_info *
57edac_device_alloc_ctl_info(unsigned pvt_sz, char *dev_name, unsigned nr_instances,
58 char *blk_name, unsigned nr_blocks, unsigned off_val,
59 struct edac_dev_sysfs_block_attribute *attrib_spec,
60 unsigned nr_attrib, int device_index)
61{
62 struct edac_dev_sysfs_block_attribute *dev_attrib, *attrib_p, *attrib;
63 struct edac_device_block *dev_blk, *blk_p, *blk;
64 struct edac_device_instance *dev_inst, *inst;
65 struct edac_device_ctl_info *dev_ctl;
66 unsigned instance, block, attr;
67 void *pvt;
68 int err;
69
70 edac_dbg(4, "instances=%d blocks=%d\n", nr_instances, nr_blocks);
71
72 dev_ctl = kzalloc(sizeof(struct edac_device_ctl_info), GFP_KERNEL);
73 if (!dev_ctl)
74 return NULL;
75
76 dev_inst = kcalloc(nr_instances, sizeof(struct edac_device_instance), GFP_KERNEL);
77 if (!dev_inst)
78 goto free;
79
80 dev_ctl->instances = dev_inst;
81
82 dev_blk = kcalloc(nr_instances * nr_blocks, sizeof(struct edac_device_block), GFP_KERNEL);
83 if (!dev_blk)
84 goto free;
85
86 dev_ctl->blocks = dev_blk;
87
88 if (nr_attrib) {
89 dev_attrib = kcalloc(nr_attrib, sizeof(struct edac_dev_sysfs_block_attribute),
90 GFP_KERNEL);
91 if (!dev_attrib)
92 goto free;
93
94 dev_ctl->attribs = dev_attrib;
95 }
96
97 if (pvt_sz) {
98 pvt = kzalloc(pvt_sz, GFP_KERNEL);
99 if (!pvt)
100 goto free;
101
102 dev_ctl->pvt_info = pvt;
103 }
104
105 dev_ctl->dev_idx = device_index;
106 dev_ctl->nr_instances = nr_instances;
107
108 /* Default logging of CEs and UEs */
109 dev_ctl->log_ce = 1;
110 dev_ctl->log_ue = 1;
111
112 /* Name of this edac device */
113 snprintf(dev_ctl->name, sizeof(dev_ctl->name),"%s", dev_name);
114
115 /* Initialize every Instance */
116 for (instance = 0; instance < nr_instances; instance++) {
117 inst = &dev_inst[instance];
118 inst->ctl = dev_ctl;
119 inst->nr_blocks = nr_blocks;
120 blk_p = &dev_blk[instance * nr_blocks];
121 inst->blocks = blk_p;
122
123 /* name of this instance */
124 snprintf(inst->name, sizeof(inst->name), "%s%u", dev_name, instance);
125
126 /* Initialize every block in each instance */
127 for (block = 0; block < nr_blocks; block++) {
128 blk = &blk_p[block];
129 blk->instance = inst;
130 snprintf(blk->name, sizeof(blk->name),
131 "%s%d", blk_name, block + off_val);
132
133 edac_dbg(4, "instance=%d inst_p=%p block=#%d block_p=%p name='%s'\n",
134 instance, inst, block, blk, blk->name);
135
136 /* if there are NO attributes OR no attribute pointer
137 * then continue on to next block iteration
138 */
139 if ((nr_attrib == 0) || (attrib_spec == NULL))
140 continue;
141
142 /* setup the attribute array for this block */
143 blk->nr_attribs = nr_attrib;
144 attrib_p = &dev_attrib[block*nr_instances*nr_attrib];
145 blk->block_attributes = attrib_p;
146
147 edac_dbg(4, "THIS BLOCK_ATTRIB=%p\n",
148 blk->block_attributes);
149
150 /* Initialize every user specified attribute in this
151 * block with the data the caller passed in
152 * Each block gets its own copy of pointers,
153 * and its unique 'value'
154 */
155 for (attr = 0; attr < nr_attrib; attr++) {
156 attrib = &attrib_p[attr];
157
158 /* populate the unique per attrib
159 * with the code pointers and info
160 */
161 attrib->attr = attrib_spec[attr].attr;
162 attrib->show = attrib_spec[attr].show;
163 attrib->store = attrib_spec[attr].store;
164
165 attrib->block = blk; /* up link */
166
167 edac_dbg(4, "alloc-attrib=%p attrib_name='%s' attrib-spec=%p spec-name=%s\n",
168 attrib, attrib->attr.name,
169 &attrib_spec[attr],
170 attrib_spec[attr].attr.name
171 );
172 }
173 }
174 }
175
176 /* Mark this instance as merely ALLOCATED */
177 dev_ctl->op_state = OP_ALLOC;
178
179 /*
180 * Initialize the 'root' kobj for the edac_device controller
181 */
182 err = edac_device_register_sysfs_main_kobj(dev_ctl);
183 if (err)
184 goto free;
185
186 /* at this point, the root kobj is valid, and in order to
187 * 'free' the object, then the function:
188 * edac_device_unregister_sysfs_main_kobj() must be called
189 * which will perform kobj unregistration and the actual free
190 * will occur during the kobject callback operation
191 */
192
193 return dev_ctl;
194
195free:
196 __edac_device_free_ctl_info(dev_ctl);
197
198 return NULL;
199}
200EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info);
201
202void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info)
203{
204 edac_device_unregister_sysfs_main_kobj(ctl_info);
205}
206EXPORT_SYMBOL_GPL(edac_device_free_ctl_info);
207
208/*
209 * find_edac_device_by_dev
210 * scans the edac_device list for a specific 'struct device *'
211 *
212 * lock to be held prior to call: device_ctls_mutex
213 *
214 * Return:
215 * pointer to control structure managing 'dev'
216 * NULL if not found on list
217 */
218static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev)
219{
220 struct edac_device_ctl_info *edac_dev;
221 struct list_head *item;
222
223 edac_dbg(0, "\n");
224
225 list_for_each(item, &edac_device_list) {
226 edac_dev = list_entry(item, struct edac_device_ctl_info, link);
227
228 if (edac_dev->dev == dev)
229 return edac_dev;
230 }
231
232 return NULL;
233}
234
235/*
236 * add_edac_dev_to_global_list
237 * Before calling this function, caller must
238 * assign a unique value to edac_dev->dev_idx.
239 *
240 * lock to be held prior to call: device_ctls_mutex
241 *
242 * Return:
243 * 0 on success
244 * 1 on failure.
245 */
246static int add_edac_dev_to_global_list(struct edac_device_ctl_info *edac_dev)
247{
248 struct list_head *item, *insert_before;
249 struct edac_device_ctl_info *rover;
250
251 insert_before = &edac_device_list;
252
253 /* Determine if already on the list */
254 rover = find_edac_device_by_dev(edac_dev->dev);
255 if (unlikely(rover != NULL))
256 goto fail0;
257
258 /* Insert in ascending order by 'dev_idx', so find position */
259 list_for_each(item, &edac_device_list) {
260 rover = list_entry(item, struct edac_device_ctl_info, link);
261
262 if (rover->dev_idx >= edac_dev->dev_idx) {
263 if (unlikely(rover->dev_idx == edac_dev->dev_idx))
264 goto fail1;
265
266 insert_before = item;
267 break;
268 }
269 }
270
271 list_add_tail_rcu(&edac_dev->link, insert_before);
272 return 0;
273
274fail0:
275 edac_printk(KERN_WARNING, EDAC_MC,
276 "%s (%s) %s %s already assigned %d\n",
277 dev_name(rover->dev), edac_dev_name(rover),
278 rover->mod_name, rover->ctl_name, rover->dev_idx);
279 return 1;
280
281fail1:
282 edac_printk(KERN_WARNING, EDAC_MC,
283 "bug in low-level driver: attempt to assign\n"
284 " duplicate dev_idx %d in %s()\n", rover->dev_idx,
285 __func__);
286 return 1;
287}
288
289/*
290 * del_edac_device_from_global_list
291 */
292static void del_edac_device_from_global_list(struct edac_device_ctl_info
293 *edac_device)
294{
295 list_del_rcu(&edac_device->link);
296
297 /* these are for safe removal of devices from global list while
298 * NMI handlers may be traversing list
299 */
300 synchronize_rcu();
301 INIT_LIST_HEAD(&edac_device->link);
302}
303
304/*
305 * edac_device_workq_function
306 * performs the operation scheduled by a workq request
307 *
308 * this workq is embedded within an edac_device_ctl_info
309 * structure, that needs to be polled for possible error events.
310 *
311 * This operation is to acquire the list mutex lock
312 * (thus preventing insertation or deletion)
313 * and then call the device's poll function IFF this device is
314 * running polled and there is a poll function defined.
315 */
316static void edac_device_workq_function(struct work_struct *work_req)
317{
318 struct delayed_work *d_work = to_delayed_work(work_req);
319 struct edac_device_ctl_info *edac_dev = to_edac_device_ctl_work(d_work);
320
321 mutex_lock(&device_ctls_mutex);
322
323 /* If we are being removed, bail out immediately */
324 if (edac_dev->op_state == OP_OFFLINE) {
325 mutex_unlock(&device_ctls_mutex);
326 return;
327 }
328
329 /* Only poll controllers that are running polled and have a check */
330 if ((edac_dev->op_state == OP_RUNNING_POLL) &&
331 (edac_dev->edac_check != NULL)) {
332 edac_dev->edac_check(edac_dev);
333 }
334
335 mutex_unlock(&device_ctls_mutex);
336
337 /* Reschedule the workq for the next time period to start again
338 * if the number of msec is for 1 sec, then adjust to the next
339 * whole one second to save timers firing all over the period
340 * between integral seconds
341 */
342 if (edac_dev->poll_msec == DEFAULT_POLL_INTERVAL)
343 edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay));
344 else
345 edac_queue_work(&edac_dev->work, edac_dev->delay);
346}
347
348/*
349 * edac_device_workq_setup
350 * initialize a workq item for this edac_device instance
351 * passing in the new delay period in msec
352 */
353static void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev,
354 unsigned msec)
355{
356 edac_dbg(0, "\n");
357
358 /* take the arg 'msec' and set it into the control structure
359 * to used in the time period calculation
360 * then calc the number of jiffies that represents
361 */
362 edac_dev->poll_msec = msec;
363 edac_dev->delay = msecs_to_jiffies(msec);
364
365 INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function);
366
367 /* optimize here for the 1 second case, which will be normal value, to
368 * fire ON the 1 second time event. This helps reduce all sorts of
369 * timers firing on sub-second basis, while they are happy
370 * to fire together on the 1 second exactly
371 */
372 if (edac_dev->poll_msec == DEFAULT_POLL_INTERVAL)
373 edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay));
374 else
375 edac_queue_work(&edac_dev->work, edac_dev->delay);
376}
377
378/*
379 * edac_device_workq_teardown
380 * stop the workq processing on this edac_dev
381 */
382static void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev)
383{
384 if (!edac_dev->edac_check)
385 return;
386
387 edac_dev->op_state = OP_OFFLINE;
388
389 edac_stop_work(&edac_dev->work);
390}
391
392/*
393 * edac_device_reset_delay_period
394 *
395 * need to stop any outstanding workq queued up at this time
396 * because we will be resetting the sleep time.
397 * Then restart the workq on the new delay
398 */
399void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev,
400 unsigned long msec)
401{
402 edac_dev->poll_msec = msec;
403 edac_dev->delay = msecs_to_jiffies(msec);
404
405 /* See comment in edac_device_workq_setup() above */
406 if (edac_dev->poll_msec == DEFAULT_POLL_INTERVAL)
407 edac_mod_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay));
408 else
409 edac_mod_work(&edac_dev->work, edac_dev->delay);
410}
411
412int edac_device_alloc_index(void)
413{
414 static atomic_t device_indexes = ATOMIC_INIT(0);
415
416 return atomic_inc_return(&device_indexes) - 1;
417}
418EXPORT_SYMBOL_GPL(edac_device_alloc_index);
419
420int edac_device_add_device(struct edac_device_ctl_info *edac_dev)
421{
422 edac_dbg(0, "\n");
423
424#ifdef CONFIG_EDAC_DEBUG
425 if (edac_debug_level >= 3)
426 edac_device_dump_device(edac_dev);
427#endif
428 mutex_lock(&device_ctls_mutex);
429
430 if (add_edac_dev_to_global_list(edac_dev))
431 goto fail0;
432
433 /* set load time so that error rate can be tracked */
434 edac_dev->start_time = jiffies;
435
436 /* create this instance's sysfs entries */
437 if (edac_device_create_sysfs(edac_dev)) {
438 edac_device_printk(edac_dev, KERN_WARNING,
439 "failed to create sysfs device\n");
440 goto fail1;
441 }
442
443 /* If there IS a check routine, then we are running POLLED */
444 if (edac_dev->edac_check != NULL) {
445 /* This instance is NOW RUNNING */
446 edac_dev->op_state = OP_RUNNING_POLL;
447
448 edac_device_workq_setup(edac_dev, edac_dev->poll_msec ?: DEFAULT_POLL_INTERVAL);
449 } else {
450 edac_dev->op_state = OP_RUNNING_INTERRUPT;
451 }
452
453 /* Report action taken */
454 edac_device_printk(edac_dev, KERN_INFO,
455 "Giving out device to module %s controller %s: DEV %s (%s)\n",
456 edac_dev->mod_name, edac_dev->ctl_name, edac_dev->dev_name,
457 edac_op_state_to_string(edac_dev->op_state));
458
459 mutex_unlock(&device_ctls_mutex);
460 return 0;
461
462fail1:
463 /* Some error, so remove the entry from the lsit */
464 del_edac_device_from_global_list(edac_dev);
465
466fail0:
467 mutex_unlock(&device_ctls_mutex);
468 return 1;
469}
470EXPORT_SYMBOL_GPL(edac_device_add_device);
471
472struct edac_device_ctl_info *edac_device_del_device(struct device *dev)
473{
474 struct edac_device_ctl_info *edac_dev;
475
476 edac_dbg(0, "\n");
477
478 mutex_lock(&device_ctls_mutex);
479
480 /* Find the structure on the list, if not there, then leave */
481 edac_dev = find_edac_device_by_dev(dev);
482 if (edac_dev == NULL) {
483 mutex_unlock(&device_ctls_mutex);
484 return NULL;
485 }
486
487 /* mark this instance as OFFLINE */
488 edac_dev->op_state = OP_OFFLINE;
489
490 /* deregister from global list */
491 del_edac_device_from_global_list(edac_dev);
492
493 mutex_unlock(&device_ctls_mutex);
494
495 /* clear workq processing on this instance */
496 edac_device_workq_teardown(edac_dev);
497
498 /* Tear down the sysfs entries for this instance */
499 edac_device_remove_sysfs(edac_dev);
500
501 edac_printk(KERN_INFO, EDAC_MC,
502 "Removed device %d for %s %s: DEV %s\n",
503 edac_dev->dev_idx,
504 edac_dev->mod_name, edac_dev->ctl_name, edac_dev_name(edac_dev));
505
506 return edac_dev;
507}
508EXPORT_SYMBOL_GPL(edac_device_del_device);
509
510static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev)
511{
512 return edac_dev->log_ce;
513}
514
515static inline int edac_device_get_log_ue(struct edac_device_ctl_info *edac_dev)
516{
517 return edac_dev->log_ue;
518}
519
520static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
521 *edac_dev)
522{
523 return edac_dev->panic_on_ue;
524}
525
526void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
527 unsigned int count, int inst_nr, int block_nr,
528 const char *msg)
529{
530 struct edac_device_instance *instance;
531 struct edac_device_block *block = NULL;
532
533 if (!count)
534 return;
535
536 if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
537 edac_device_printk(edac_dev, KERN_ERR,
538 "INTERNAL ERROR: 'instance' out of range "
539 "(%d >= %d)\n", inst_nr,
540 edac_dev->nr_instances);
541 return;
542 }
543
544 instance = edac_dev->instances + inst_nr;
545
546 if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
547 edac_device_printk(edac_dev, KERN_ERR,
548 "INTERNAL ERROR: instance %d 'block' "
549 "out of range (%d >= %d)\n",
550 inst_nr, block_nr,
551 instance->nr_blocks);
552 return;
553 }
554
555 if (instance->nr_blocks > 0) {
556 block = instance->blocks + block_nr;
557 block->counters.ce_count += count;
558 }
559
560 /* Propagate the count up the 'totals' tree */
561 instance->counters.ce_count += count;
562 edac_dev->counters.ce_count += count;
563
564 if (edac_device_get_log_ce(edac_dev))
565 edac_device_printk(edac_dev, KERN_WARNING,
566 "CE: %s instance: %s block: %s count: %d '%s'\n",
567 edac_dev->ctl_name, instance->name,
568 block ? block->name : "N/A", count, msg);
569}
570EXPORT_SYMBOL_GPL(edac_device_handle_ce_count);
571
572void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev,
573 unsigned int count, int inst_nr, int block_nr,
574 const char *msg)
575{
576 struct edac_device_instance *instance;
577 struct edac_device_block *block = NULL;
578
579 if (!count)
580 return;
581
582 if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
583 edac_device_printk(edac_dev, KERN_ERR,
584 "INTERNAL ERROR: 'instance' out of range "
585 "(%d >= %d)\n", inst_nr,
586 edac_dev->nr_instances);
587 return;
588 }
589
590 instance = edac_dev->instances + inst_nr;
591
592 if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
593 edac_device_printk(edac_dev, KERN_ERR,
594 "INTERNAL ERROR: instance %d 'block' "
595 "out of range (%d >= %d)\n",
596 inst_nr, block_nr,
597 instance->nr_blocks);
598 return;
599 }
600
601 if (instance->nr_blocks > 0) {
602 block = instance->blocks + block_nr;
603 block->counters.ue_count += count;
604 }
605
606 /* Propagate the count up the 'totals' tree */
607 instance->counters.ue_count += count;
608 edac_dev->counters.ue_count += count;
609
610 if (edac_device_get_log_ue(edac_dev))
611 edac_device_printk(edac_dev, KERN_EMERG,
612 "UE: %s instance: %s block: %s count: %d '%s'\n",
613 edac_dev->ctl_name, instance->name,
614 block ? block->name : "N/A", count, msg);
615
616 if (edac_device_get_panic_on_ue(edac_dev))
617 panic("EDAC %s: UE instance: %s block %s count: %d '%s'\n",
618 edac_dev->ctl_name, instance->name,
619 block ? block->name : "N/A", count, msg);
620}
621EXPORT_SYMBOL_GPL(edac_device_handle_ue_count);
1
2/*
3 * edac_device.c
4 * (C) 2007 www.douglaskthompson.com
5 *
6 * This file may be distributed under the terms of the
7 * GNU General Public License.
8 *
9 * Written by Doug Thompson <norsk5@xmission.com>
10 *
11 * edac_device API implementation
12 * 19 Jan 2007
13 */
14
15#include <asm/page.h>
16#include <linux/uaccess.h>
17#include <linux/ctype.h>
18#include <linux/highmem.h>
19#include <linux/init.h>
20#include <linux/jiffies.h>
21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/smp.h>
24#include <linux/spinlock.h>
25#include <linux/sysctl.h>
26#include <linux/timer.h>
27
28#include "edac_device.h"
29#include "edac_module.h"
30
31/* lock for the list: 'edac_device_list', manipulation of this list
32 * is protected by the 'device_ctls_mutex' lock
33 */
34static DEFINE_MUTEX(device_ctls_mutex);
35static LIST_HEAD(edac_device_list);
36
37#ifdef CONFIG_EDAC_DEBUG
38static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev)
39{
40 edac_dbg(3, "\tedac_dev = %p dev_idx=%d\n",
41 edac_dev, edac_dev->dev_idx);
42 edac_dbg(4, "\tedac_dev->edac_check = %p\n", edac_dev->edac_check);
43 edac_dbg(3, "\tdev = %p\n", edac_dev->dev);
44 edac_dbg(3, "\tmod_name:ctl_name = %s:%s\n",
45 edac_dev->mod_name, edac_dev->ctl_name);
46 edac_dbg(3, "\tpvt_info = %p\n\n", edac_dev->pvt_info);
47}
48#endif /* CONFIG_EDAC_DEBUG */
49
50struct edac_device_ctl_info *edac_device_alloc_ctl_info(
51 unsigned sz_private,
52 char *edac_device_name, unsigned nr_instances,
53 char *edac_block_name, unsigned nr_blocks,
54 unsigned offset_value, /* zero, 1, or other based offset */
55 struct edac_dev_sysfs_block_attribute *attrib_spec, unsigned nr_attrib,
56 int device_index)
57{
58 struct edac_device_ctl_info *dev_ctl;
59 struct edac_device_instance *dev_inst, *inst;
60 struct edac_device_block *dev_blk, *blk_p, *blk;
61 struct edac_dev_sysfs_block_attribute *dev_attrib, *attrib_p, *attrib;
62 unsigned total_size;
63 unsigned count;
64 unsigned instance, block, attr;
65 void *pvt, *p;
66 int err;
67
68 edac_dbg(4, "instances=%d blocks=%d\n", nr_instances, nr_blocks);
69
70 /* Calculate the size of memory we need to allocate AND
71 * determine the offsets of the various item arrays
72 * (instance,block,attrib) from the start of an allocated structure.
73 * We want the alignment of each item (instance,block,attrib)
74 * to be at least as stringent as what the compiler would
75 * provide if we could simply hardcode everything into a single struct.
76 */
77 p = NULL;
78 dev_ctl = edac_align_ptr(&p, sizeof(*dev_ctl), 1);
79
80 /* Calc the 'end' offset past end of ONE ctl_info structure
81 * which will become the start of the 'instance' array
82 */
83 dev_inst = edac_align_ptr(&p, sizeof(*dev_inst), nr_instances);
84
85 /* Calc the 'end' offset past the instance array within the ctl_info
86 * which will become the start of the block array
87 */
88 count = nr_instances * nr_blocks;
89 dev_blk = edac_align_ptr(&p, sizeof(*dev_blk), count);
90
91 /* Calc the 'end' offset past the dev_blk array
92 * which will become the start of the attrib array, if any.
93 */
94 /* calc how many nr_attrib we need */
95 if (nr_attrib > 0)
96 count *= nr_attrib;
97 dev_attrib = edac_align_ptr(&p, sizeof(*dev_attrib), count);
98
99 /* Calc the 'end' offset past the attributes array */
100 pvt = edac_align_ptr(&p, sz_private, 1);
101
102 /* 'pvt' now points to where the private data area is.
103 * At this point 'pvt' (like dev_inst,dev_blk and dev_attrib)
104 * is baselined at ZERO
105 */
106 total_size = ((unsigned long)pvt) + sz_private;
107
108 /* Allocate the amount of memory for the set of control structures */
109 dev_ctl = kzalloc(total_size, GFP_KERNEL);
110 if (dev_ctl == NULL)
111 return NULL;
112
113 /* Adjust pointers so they point within the actual memory we
114 * just allocated rather than an imaginary chunk of memory
115 * located at address 0.
116 * 'dev_ctl' points to REAL memory, while the others are
117 * ZERO based and thus need to be adjusted to point within
118 * the allocated memory.
119 */
120 dev_inst = (struct edac_device_instance *)
121 (((char *)dev_ctl) + ((unsigned long)dev_inst));
122 dev_blk = (struct edac_device_block *)
123 (((char *)dev_ctl) + ((unsigned long)dev_blk));
124 dev_attrib = (struct edac_dev_sysfs_block_attribute *)
125 (((char *)dev_ctl) + ((unsigned long)dev_attrib));
126 pvt = sz_private ? (((char *)dev_ctl) + ((unsigned long)pvt)) : NULL;
127
128 /* Begin storing the information into the control info structure */
129 dev_ctl->dev_idx = device_index;
130 dev_ctl->nr_instances = nr_instances;
131 dev_ctl->instances = dev_inst;
132 dev_ctl->pvt_info = pvt;
133
134 /* Default logging of CEs and UEs */
135 dev_ctl->log_ce = 1;
136 dev_ctl->log_ue = 1;
137
138 /* Name of this edac device */
139 snprintf(dev_ctl->name,sizeof(dev_ctl->name),"%s",edac_device_name);
140
141 edac_dbg(4, "edac_dev=%p next after end=%p\n",
142 dev_ctl, pvt + sz_private);
143
144 /* Initialize every Instance */
145 for (instance = 0; instance < nr_instances; instance++) {
146 inst = &dev_inst[instance];
147 inst->ctl = dev_ctl;
148 inst->nr_blocks = nr_blocks;
149 blk_p = &dev_blk[instance * nr_blocks];
150 inst->blocks = blk_p;
151
152 /* name of this instance */
153 snprintf(inst->name, sizeof(inst->name),
154 "%s%u", edac_device_name, instance);
155
156 /* Initialize every block in each instance */
157 for (block = 0; block < nr_blocks; block++) {
158 blk = &blk_p[block];
159 blk->instance = inst;
160 snprintf(blk->name, sizeof(blk->name),
161 "%s%d", edac_block_name, block+offset_value);
162
163 edac_dbg(4, "instance=%d inst_p=%p block=#%d block_p=%p name='%s'\n",
164 instance, inst, block, blk, blk->name);
165
166 /* if there are NO attributes OR no attribute pointer
167 * then continue on to next block iteration
168 */
169 if ((nr_attrib == 0) || (attrib_spec == NULL))
170 continue;
171
172 /* setup the attribute array for this block */
173 blk->nr_attribs = nr_attrib;
174 attrib_p = &dev_attrib[block*nr_instances*nr_attrib];
175 blk->block_attributes = attrib_p;
176
177 edac_dbg(4, "THIS BLOCK_ATTRIB=%p\n",
178 blk->block_attributes);
179
180 /* Initialize every user specified attribute in this
181 * block with the data the caller passed in
182 * Each block gets its own copy of pointers,
183 * and its unique 'value'
184 */
185 for (attr = 0; attr < nr_attrib; attr++) {
186 attrib = &attrib_p[attr];
187
188 /* populate the unique per attrib
189 * with the code pointers and info
190 */
191 attrib->attr = attrib_spec[attr].attr;
192 attrib->show = attrib_spec[attr].show;
193 attrib->store = attrib_spec[attr].store;
194
195 attrib->block = blk; /* up link */
196
197 edac_dbg(4, "alloc-attrib=%p attrib_name='%s' attrib-spec=%p spec-name=%s\n",
198 attrib, attrib->attr.name,
199 &attrib_spec[attr],
200 attrib_spec[attr].attr.name
201 );
202 }
203 }
204 }
205
206 /* Mark this instance as merely ALLOCATED */
207 dev_ctl->op_state = OP_ALLOC;
208
209 /*
210 * Initialize the 'root' kobj for the edac_device controller
211 */
212 err = edac_device_register_sysfs_main_kobj(dev_ctl);
213 if (err) {
214 kfree(dev_ctl);
215 return NULL;
216 }
217
218 /* at this point, the root kobj is valid, and in order to
219 * 'free' the object, then the function:
220 * edac_device_unregister_sysfs_main_kobj() must be called
221 * which will perform kobj unregistration and the actual free
222 * will occur during the kobject callback operation
223 */
224
225 return dev_ctl;
226}
227EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info);
228
229void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info)
230{
231 edac_device_unregister_sysfs_main_kobj(ctl_info);
232}
233EXPORT_SYMBOL_GPL(edac_device_free_ctl_info);
234
235/*
236 * find_edac_device_by_dev
237 * scans the edac_device list for a specific 'struct device *'
238 *
239 * lock to be held prior to call: device_ctls_mutex
240 *
241 * Return:
242 * pointer to control structure managing 'dev'
243 * NULL if not found on list
244 */
245static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev)
246{
247 struct edac_device_ctl_info *edac_dev;
248 struct list_head *item;
249
250 edac_dbg(0, "\n");
251
252 list_for_each(item, &edac_device_list) {
253 edac_dev = list_entry(item, struct edac_device_ctl_info, link);
254
255 if (edac_dev->dev == dev)
256 return edac_dev;
257 }
258
259 return NULL;
260}
261
262/*
263 * add_edac_dev_to_global_list
264 * Before calling this function, caller must
265 * assign a unique value to edac_dev->dev_idx.
266 *
267 * lock to be held prior to call: device_ctls_mutex
268 *
269 * Return:
270 * 0 on success
271 * 1 on failure.
272 */
273static int add_edac_dev_to_global_list(struct edac_device_ctl_info *edac_dev)
274{
275 struct list_head *item, *insert_before;
276 struct edac_device_ctl_info *rover;
277
278 insert_before = &edac_device_list;
279
280 /* Determine if already on the list */
281 rover = find_edac_device_by_dev(edac_dev->dev);
282 if (unlikely(rover != NULL))
283 goto fail0;
284
285 /* Insert in ascending order by 'dev_idx', so find position */
286 list_for_each(item, &edac_device_list) {
287 rover = list_entry(item, struct edac_device_ctl_info, link);
288
289 if (rover->dev_idx >= edac_dev->dev_idx) {
290 if (unlikely(rover->dev_idx == edac_dev->dev_idx))
291 goto fail1;
292
293 insert_before = item;
294 break;
295 }
296 }
297
298 list_add_tail_rcu(&edac_dev->link, insert_before);
299 return 0;
300
301fail0:
302 edac_printk(KERN_WARNING, EDAC_MC,
303 "%s (%s) %s %s already assigned %d\n",
304 dev_name(rover->dev), edac_dev_name(rover),
305 rover->mod_name, rover->ctl_name, rover->dev_idx);
306 return 1;
307
308fail1:
309 edac_printk(KERN_WARNING, EDAC_MC,
310 "bug in low-level driver: attempt to assign\n"
311 " duplicate dev_idx %d in %s()\n", rover->dev_idx,
312 __func__);
313 return 1;
314}
315
316/*
317 * del_edac_device_from_global_list
318 */
319static void del_edac_device_from_global_list(struct edac_device_ctl_info
320 *edac_device)
321{
322 list_del_rcu(&edac_device->link);
323
324 /* these are for safe removal of devices from global list while
325 * NMI handlers may be traversing list
326 */
327 synchronize_rcu();
328 INIT_LIST_HEAD(&edac_device->link);
329}
330
331/*
332 * edac_device_workq_function
333 * performs the operation scheduled by a workq request
334 *
335 * this workq is embedded within an edac_device_ctl_info
336 * structure, that needs to be polled for possible error events.
337 *
338 * This operation is to acquire the list mutex lock
339 * (thus preventing insertation or deletion)
340 * and then call the device's poll function IFF this device is
341 * running polled and there is a poll function defined.
342 */
343static void edac_device_workq_function(struct work_struct *work_req)
344{
345 struct delayed_work *d_work = to_delayed_work(work_req);
346 struct edac_device_ctl_info *edac_dev = to_edac_device_ctl_work(d_work);
347
348 mutex_lock(&device_ctls_mutex);
349
350 /* If we are being removed, bail out immediately */
351 if (edac_dev->op_state == OP_OFFLINE) {
352 mutex_unlock(&device_ctls_mutex);
353 return;
354 }
355
356 /* Only poll controllers that are running polled and have a check */
357 if ((edac_dev->op_state == OP_RUNNING_POLL) &&
358 (edac_dev->edac_check != NULL)) {
359 edac_dev->edac_check(edac_dev);
360 }
361
362 mutex_unlock(&device_ctls_mutex);
363
364 /* Reschedule the workq for the next time period to start again
365 * if the number of msec is for 1 sec, then adjust to the next
366 * whole one second to save timers firing all over the period
367 * between integral seconds
368 */
369 if (edac_dev->poll_msec == 1000)
370 edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay));
371 else
372 edac_queue_work(&edac_dev->work, edac_dev->delay);
373}
374
375/*
376 * edac_device_workq_setup
377 * initialize a workq item for this edac_device instance
378 * passing in the new delay period in msec
379 */
380static void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev,
381 unsigned msec)
382{
383 edac_dbg(0, "\n");
384
385 /* take the arg 'msec' and set it into the control structure
386 * to used in the time period calculation
387 * then calc the number of jiffies that represents
388 */
389 edac_dev->poll_msec = msec;
390 edac_dev->delay = msecs_to_jiffies(msec);
391
392 INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function);
393
394 /* optimize here for the 1 second case, which will be normal value, to
395 * fire ON the 1 second time event. This helps reduce all sorts of
396 * timers firing on sub-second basis, while they are happy
397 * to fire together on the 1 second exactly
398 */
399 if (edac_dev->poll_msec == 1000)
400 edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay));
401 else
402 edac_queue_work(&edac_dev->work, edac_dev->delay);
403}
404
405/*
406 * edac_device_workq_teardown
407 * stop the workq processing on this edac_dev
408 */
409static void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev)
410{
411 if (!edac_dev->edac_check)
412 return;
413
414 edac_dev->op_state = OP_OFFLINE;
415
416 edac_stop_work(&edac_dev->work);
417}
418
419/*
420 * edac_device_reset_delay_period
421 *
422 * need to stop any outstanding workq queued up at this time
423 * because we will be resetting the sleep time.
424 * Then restart the workq on the new delay
425 */
426void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev,
427 unsigned long value)
428{
429 unsigned long jiffs = msecs_to_jiffies(value);
430
431 if (value == 1000)
432 jiffs = round_jiffies_relative(value);
433
434 edac_dev->poll_msec = value;
435 edac_dev->delay = jiffs;
436
437 edac_mod_work(&edac_dev->work, jiffs);
438}
439
440int edac_device_alloc_index(void)
441{
442 static atomic_t device_indexes = ATOMIC_INIT(0);
443
444 return atomic_inc_return(&device_indexes) - 1;
445}
446EXPORT_SYMBOL_GPL(edac_device_alloc_index);
447
448int edac_device_add_device(struct edac_device_ctl_info *edac_dev)
449{
450 edac_dbg(0, "\n");
451
452#ifdef CONFIG_EDAC_DEBUG
453 if (edac_debug_level >= 3)
454 edac_device_dump_device(edac_dev);
455#endif
456 mutex_lock(&device_ctls_mutex);
457
458 if (add_edac_dev_to_global_list(edac_dev))
459 goto fail0;
460
461 /* set load time so that error rate can be tracked */
462 edac_dev->start_time = jiffies;
463
464 /* create this instance's sysfs entries */
465 if (edac_device_create_sysfs(edac_dev)) {
466 edac_device_printk(edac_dev, KERN_WARNING,
467 "failed to create sysfs device\n");
468 goto fail1;
469 }
470
471 /* If there IS a check routine, then we are running POLLED */
472 if (edac_dev->edac_check != NULL) {
473 /* This instance is NOW RUNNING */
474 edac_dev->op_state = OP_RUNNING_POLL;
475
476 /*
477 * enable workq processing on this instance,
478 * default = 1000 msec
479 */
480 edac_device_workq_setup(edac_dev, 1000);
481 } else {
482 edac_dev->op_state = OP_RUNNING_INTERRUPT;
483 }
484
485 /* Report action taken */
486 edac_device_printk(edac_dev, KERN_INFO,
487 "Giving out device to module %s controller %s: DEV %s (%s)\n",
488 edac_dev->mod_name, edac_dev->ctl_name, edac_dev->dev_name,
489 edac_op_state_to_string(edac_dev->op_state));
490
491 mutex_unlock(&device_ctls_mutex);
492 return 0;
493
494fail1:
495 /* Some error, so remove the entry from the lsit */
496 del_edac_device_from_global_list(edac_dev);
497
498fail0:
499 mutex_unlock(&device_ctls_mutex);
500 return 1;
501}
502EXPORT_SYMBOL_GPL(edac_device_add_device);
503
504struct edac_device_ctl_info *edac_device_del_device(struct device *dev)
505{
506 struct edac_device_ctl_info *edac_dev;
507
508 edac_dbg(0, "\n");
509
510 mutex_lock(&device_ctls_mutex);
511
512 /* Find the structure on the list, if not there, then leave */
513 edac_dev = find_edac_device_by_dev(dev);
514 if (edac_dev == NULL) {
515 mutex_unlock(&device_ctls_mutex);
516 return NULL;
517 }
518
519 /* mark this instance as OFFLINE */
520 edac_dev->op_state = OP_OFFLINE;
521
522 /* deregister from global list */
523 del_edac_device_from_global_list(edac_dev);
524
525 mutex_unlock(&device_ctls_mutex);
526
527 /* clear workq processing on this instance */
528 edac_device_workq_teardown(edac_dev);
529
530 /* Tear down the sysfs entries for this instance */
531 edac_device_remove_sysfs(edac_dev);
532
533 edac_printk(KERN_INFO, EDAC_MC,
534 "Removed device %d for %s %s: DEV %s\n",
535 edac_dev->dev_idx,
536 edac_dev->mod_name, edac_dev->ctl_name, edac_dev_name(edac_dev));
537
538 return edac_dev;
539}
540EXPORT_SYMBOL_GPL(edac_device_del_device);
541
542static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev)
543{
544 return edac_dev->log_ce;
545}
546
547static inline int edac_device_get_log_ue(struct edac_device_ctl_info *edac_dev)
548{
549 return edac_dev->log_ue;
550}
551
552static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
553 *edac_dev)
554{
555 return edac_dev->panic_on_ue;
556}
557
558void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
559 int inst_nr, int block_nr, const char *msg)
560{
561 struct edac_device_instance *instance;
562 struct edac_device_block *block = NULL;
563
564 if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
565 edac_device_printk(edac_dev, KERN_ERR,
566 "INTERNAL ERROR: 'instance' out of range "
567 "(%d >= %d)\n", inst_nr,
568 edac_dev->nr_instances);
569 return;
570 }
571
572 instance = edac_dev->instances + inst_nr;
573
574 if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
575 edac_device_printk(edac_dev, KERN_ERR,
576 "INTERNAL ERROR: instance %d 'block' "
577 "out of range (%d >= %d)\n",
578 inst_nr, block_nr,
579 instance->nr_blocks);
580 return;
581 }
582
583 if (instance->nr_blocks > 0) {
584 block = instance->blocks + block_nr;
585 block->counters.ce_count++;
586 }
587
588 /* Propagate the count up the 'totals' tree */
589 instance->counters.ce_count++;
590 edac_dev->counters.ce_count++;
591
592 if (edac_device_get_log_ce(edac_dev))
593 edac_device_printk(edac_dev, KERN_WARNING,
594 "CE: %s instance: %s block: %s '%s'\n",
595 edac_dev->ctl_name, instance->name,
596 block ? block->name : "N/A", msg);
597}
598EXPORT_SYMBOL_GPL(edac_device_handle_ce);
599
600void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
601 int inst_nr, int block_nr, const char *msg)
602{
603 struct edac_device_instance *instance;
604 struct edac_device_block *block = NULL;
605
606 if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
607 edac_device_printk(edac_dev, KERN_ERR,
608 "INTERNAL ERROR: 'instance' out of range "
609 "(%d >= %d)\n", inst_nr,
610 edac_dev->nr_instances);
611 return;
612 }
613
614 instance = edac_dev->instances + inst_nr;
615
616 if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
617 edac_device_printk(edac_dev, KERN_ERR,
618 "INTERNAL ERROR: instance %d 'block' "
619 "out of range (%d >= %d)\n",
620 inst_nr, block_nr,
621 instance->nr_blocks);
622 return;
623 }
624
625 if (instance->nr_blocks > 0) {
626 block = instance->blocks + block_nr;
627 block->counters.ue_count++;
628 }
629
630 /* Propagate the count up the 'totals' tree */
631 instance->counters.ue_count++;
632 edac_dev->counters.ue_count++;
633
634 if (edac_device_get_log_ue(edac_dev))
635 edac_device_printk(edac_dev, KERN_EMERG,
636 "UE: %s instance: %s block: %s '%s'\n",
637 edac_dev->ctl_name, instance->name,
638 block ? block->name : "N/A", msg);
639
640 if (edac_device_get_panic_on_ue(edac_dev))
641 panic("EDAC %s: UE instance: %s block %s '%s'\n",
642 edac_dev->ctl_name, instance->name,
643 block ? block->name : "N/A", msg);
644}
645EXPORT_SYMBOL_GPL(edac_device_handle_ue);