4 * (C) 2007 www.douglaskthompson.com
6 * This file may be distributed under the terms of the
7 * GNU General Public License.
9 * Written by Doug Thompson <norsk5@xmission.com>
11 * edac_device API implementation
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>
28 #include "edac_device.h"
29 #include "edac_module.h"
31 /* lock for the list: 'edac_device_list', manipulation of this list
32 * is protected by the 'device_ctls_mutex' lock
34 static DEFINE_MUTEX(device_ctls_mutex);
35 static LIST_HEAD(edac_device_list);
37 /* Default workqueue processing interval on this instance, in msecs */
38 #define DEFAULT_POLL_INTERVAL 1000
40 #ifdef CONFIG_EDAC_DEBUG
41 static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev)
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);
51 #endif /* CONFIG_EDAC_DEBUG */
54 * @off_val: zero, 1, or other based offset
56 struct edac_device_ctl_info *
57 edac_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)
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;
70 edac_dbg(4, "instances=%d blocks=%d\n", nr_instances, nr_blocks);
72 dev_ctl = kzalloc(sizeof(struct edac_device_ctl_info), GFP_KERNEL);
76 dev_inst = kcalloc(nr_instances, sizeof(struct edac_device_instance), GFP_KERNEL);
80 dev_ctl->instances = dev_inst;
82 dev_blk = kcalloc(nr_instances * nr_blocks, sizeof(struct edac_device_block), GFP_KERNEL);
86 dev_ctl->blocks = dev_blk;
89 dev_attrib = kcalloc(nr_attrib, sizeof(struct edac_dev_sysfs_block_attribute),
94 dev_ctl->attribs = dev_attrib;
98 pvt = kzalloc(pvt_sz, GFP_KERNEL);
102 dev_ctl->pvt_info = pvt;
105 dev_ctl->dev_idx = device_index;
106 dev_ctl->nr_instances = nr_instances;
108 /* Default logging of CEs and UEs */
112 /* Name of this edac device */
113 snprintf(dev_ctl->name, sizeof(dev_ctl->name),"%s", dev_name);
115 /* Initialize every Instance */
116 for (instance = 0; instance < nr_instances; instance++) {
117 inst = &dev_inst[instance];
119 inst->nr_blocks = nr_blocks;
120 blk_p = &dev_blk[instance * nr_blocks];
121 inst->blocks = blk_p;
123 /* name of this instance */
124 snprintf(inst->name, sizeof(inst->name), "%s%u", dev_name, instance);
126 /* Initialize every block in each instance */
127 for (block = 0; block < nr_blocks; block++) {
129 blk->instance = inst;
130 snprintf(blk->name, sizeof(blk->name),
131 "%s%d", blk_name, block + off_val);
133 edac_dbg(4, "instance=%d inst_p=%p block=#%d block_p=%p name='%s'\n",
134 instance, inst, block, blk, blk->name);
136 /* if there are NO attributes OR no attribute pointer
137 * then continue on to next block iteration
139 if ((nr_attrib == 0) || (attrib_spec == NULL))
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;
147 edac_dbg(4, "THIS BLOCK_ATTRIB=%p\n",
148 blk->block_attributes);
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'
155 for (attr = 0; attr < nr_attrib; attr++) {
156 attrib = &attrib_p[attr];
158 /* populate the unique per attrib
159 * with the code pointers and info
161 attrib->attr = attrib_spec[attr].attr;
162 attrib->show = attrib_spec[attr].show;
163 attrib->store = attrib_spec[attr].store;
165 attrib->block = blk; /* up link */
167 edac_dbg(4, "alloc-attrib=%p attrib_name='%s' attrib-spec=%p spec-name=%s\n",
168 attrib, attrib->attr.name,
170 attrib_spec[attr].attr.name
176 /* Mark this instance as merely ALLOCATED */
177 dev_ctl->op_state = OP_ALLOC;
180 * Initialize the 'root' kobj for the edac_device controller
182 err = edac_device_register_sysfs_main_kobj(dev_ctl);
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
196 __edac_device_free_ctl_info(dev_ctl);
200 EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info);
202 void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info)
204 edac_device_unregister_sysfs_main_kobj(ctl_info);
206 EXPORT_SYMBOL_GPL(edac_device_free_ctl_info);
209 * find_edac_device_by_dev
210 * scans the edac_device list for a specific 'struct device *'
212 * lock to be held prior to call: device_ctls_mutex
215 * pointer to control structure managing 'dev'
216 * NULL if not found on list
218 static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev)
220 struct edac_device_ctl_info *edac_dev;
221 struct list_head *item;
225 list_for_each(item, &edac_device_list) {
226 edac_dev = list_entry(item, struct edac_device_ctl_info, link);
228 if (edac_dev->dev == dev)
236 * add_edac_dev_to_global_list
237 * Before calling this function, caller must
238 * assign a unique value to edac_dev->dev_idx.
240 * lock to be held prior to call: device_ctls_mutex
246 static int add_edac_dev_to_global_list(struct edac_device_ctl_info *edac_dev)
248 struct list_head *item, *insert_before;
249 struct edac_device_ctl_info *rover;
251 insert_before = &edac_device_list;
253 /* Determine if already on the list */
254 rover = find_edac_device_by_dev(edac_dev->dev);
255 if (unlikely(rover != NULL))
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);
262 if (rover->dev_idx >= edac_dev->dev_idx) {
263 if (unlikely(rover->dev_idx == edac_dev->dev_idx))
266 insert_before = item;
271 list_add_tail_rcu(&edac_dev->link, insert_before);
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);
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,
290 * del_edac_device_from_global_list
292 static void del_edac_device_from_global_list(struct edac_device_ctl_info
295 list_del_rcu(&edac_device->link);
297 /* these are for safe removal of devices from global list while
298 * NMI handlers may be traversing list
301 INIT_LIST_HEAD(&edac_device->link);
305 * edac_device_workq_function
306 * performs the operation scheduled by a workq request
308 * this workq is embedded within an edac_device_ctl_info
309 * structure, that needs to be polled for possible error events.
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.
316 static void edac_device_workq_function(struct work_struct *work_req)
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);
321 mutex_lock(&device_ctls_mutex);
323 /* If we are being removed, bail out immediately */
324 if (edac_dev->op_state == OP_OFFLINE) {
325 mutex_unlock(&device_ctls_mutex);
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);
335 mutex_unlock(&device_ctls_mutex);
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
342 if (edac_dev->poll_msec == DEFAULT_POLL_INTERVAL)
343 edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay));
345 edac_queue_work(&edac_dev->work, edac_dev->delay);
349 * edac_device_workq_setup
350 * initialize a workq item for this edac_device instance
351 * passing in the new delay period in msec
353 static void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev,
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
362 edac_dev->poll_msec = msec;
363 edac_dev->delay = msecs_to_jiffies(msec);
365 INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function);
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
372 if (edac_dev->poll_msec == DEFAULT_POLL_INTERVAL)
373 edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay));
375 edac_queue_work(&edac_dev->work, edac_dev->delay);
379 * edac_device_workq_teardown
380 * stop the workq processing on this edac_dev
382 static void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev)
384 if (!edac_dev->edac_check)
387 edac_dev->op_state = OP_OFFLINE;
389 edac_stop_work(&edac_dev->work);
393 * edac_device_reset_delay_period
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
399 void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev,
402 edac_dev->poll_msec = msec;
403 edac_dev->delay = msecs_to_jiffies(msec);
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));
409 edac_mod_work(&edac_dev->work, edac_dev->delay);
412 int edac_device_alloc_index(void)
414 static atomic_t device_indexes = ATOMIC_INIT(0);
416 return atomic_inc_return(&device_indexes) - 1;
418 EXPORT_SYMBOL_GPL(edac_device_alloc_index);
420 int edac_device_add_device(struct edac_device_ctl_info *edac_dev)
424 #ifdef CONFIG_EDAC_DEBUG
425 if (edac_debug_level >= 3)
426 edac_device_dump_device(edac_dev);
428 mutex_lock(&device_ctls_mutex);
430 if (add_edac_dev_to_global_list(edac_dev))
433 /* set load time so that error rate can be tracked */
434 edac_dev->start_time = jiffies;
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");
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;
448 edac_device_workq_setup(edac_dev, edac_dev->poll_msec ?: DEFAULT_POLL_INTERVAL);
450 edac_dev->op_state = OP_RUNNING_INTERRUPT;
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));
459 mutex_unlock(&device_ctls_mutex);
463 /* Some error, so remove the entry from the lsit */
464 del_edac_device_from_global_list(edac_dev);
467 mutex_unlock(&device_ctls_mutex);
470 EXPORT_SYMBOL_GPL(edac_device_add_device);
472 struct edac_device_ctl_info *edac_device_del_device(struct device *dev)
474 struct edac_device_ctl_info *edac_dev;
478 mutex_lock(&device_ctls_mutex);
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);
487 /* mark this instance as OFFLINE */
488 edac_dev->op_state = OP_OFFLINE;
490 /* deregister from global list */
491 del_edac_device_from_global_list(edac_dev);
493 mutex_unlock(&device_ctls_mutex);
495 /* clear workq processing on this instance */
496 edac_device_workq_teardown(edac_dev);
498 /* Tear down the sysfs entries for this instance */
499 edac_device_remove_sysfs(edac_dev);
501 edac_printk(KERN_INFO, EDAC_MC,
502 "Removed device %d for %s %s: DEV %s\n",
504 edac_dev->mod_name, edac_dev->ctl_name, edac_dev_name(edac_dev));
508 EXPORT_SYMBOL_GPL(edac_device_del_device);
510 static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev)
512 return edac_dev->log_ce;
515 static inline int edac_device_get_log_ue(struct edac_device_ctl_info *edac_dev)
517 return edac_dev->log_ue;
520 static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
523 return edac_dev->panic_on_ue;
526 void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
527 unsigned int count, int inst_nr, int block_nr,
530 struct edac_device_instance *instance;
531 struct edac_device_block *block = NULL;
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);
544 instance = edac_dev->instances + inst_nr;
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",
551 instance->nr_blocks);
555 if (instance->nr_blocks > 0) {
556 block = instance->blocks + block_nr;
557 block->counters.ce_count += count;
560 /* Propagate the count up the 'totals' tree */
561 instance->counters.ce_count += count;
562 edac_dev->counters.ce_count += count;
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);
570 EXPORT_SYMBOL_GPL(edac_device_handle_ce_count);
572 void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev,
573 unsigned int count, int inst_nr, int block_nr,
576 struct edac_device_instance *instance;
577 struct edac_device_block *block = NULL;
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);
590 instance = edac_dev->instances + inst_nr;
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",
597 instance->nr_blocks);
601 if (instance->nr_blocks > 0) {
602 block = instance->blocks + block_nr;
603 block->counters.ue_count += count;
606 /* Propagate the count up the 'totals' tree */
607 instance->counters.ue_count += count;
608 edac_dev->counters.ue_count += count;
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);
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);
621 EXPORT_SYMBOL_GPL(edac_device_handle_ue_count);