4 * (C) 2007 www.douglaskthompson.com
6 * This file may be distributed under the terms of the
7 * GNU General Public License.
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,
61 struct edac_device_block *dev_blk, *blk_p, *blk;
62 struct edac_device_instance *dev_inst, *inst;
63 struct edac_device_ctl_info *dev_ctl;
64 unsigned instance, block;
68 edac_dbg(4, "instances=%d blocks=%d\n", nr_instances, nr_blocks);
70 dev_ctl = kzalloc(sizeof(struct edac_device_ctl_info), GFP_KERNEL);
74 dev_inst = kcalloc(nr_instances, sizeof(struct edac_device_instance), GFP_KERNEL);
78 dev_ctl->instances = dev_inst;
80 dev_blk = kcalloc(nr_instances * nr_blocks, sizeof(struct edac_device_block), GFP_KERNEL);
84 dev_ctl->blocks = dev_blk;
87 pvt = kzalloc(pvt_sz, GFP_KERNEL);
91 dev_ctl->pvt_info = pvt;
94 dev_ctl->dev_idx = device_index;
95 dev_ctl->nr_instances = nr_instances;
97 /* Default logging of CEs and UEs */
101 /* Name of this edac device */
102 snprintf(dev_ctl->name, sizeof(dev_ctl->name),"%s", dev_name);
104 /* Initialize every Instance */
105 for (instance = 0; instance < nr_instances; instance++) {
106 inst = &dev_inst[instance];
108 inst->nr_blocks = nr_blocks;
109 blk_p = &dev_blk[instance * nr_blocks];
110 inst->blocks = blk_p;
112 /* name of this instance */
113 snprintf(inst->name, sizeof(inst->name), "%s%u", dev_name, instance);
115 /* Initialize every block in each instance */
116 for (block = 0; block < nr_blocks; block++) {
118 blk->instance = inst;
119 snprintf(blk->name, sizeof(blk->name),
120 "%s%d", blk_name, block + off_val);
122 edac_dbg(4, "instance=%d inst_p=%p block=#%d block_p=%p name='%s'\n",
123 instance, inst, block, blk, blk->name);
127 /* Mark this instance as merely ALLOCATED */
128 dev_ctl->op_state = OP_ALLOC;
131 * Initialize the 'root' kobj for the edac_device controller
133 err = edac_device_register_sysfs_main_kobj(dev_ctl);
137 /* at this point, the root kobj is valid, and in order to
138 * 'free' the object, then the function:
139 * edac_device_unregister_sysfs_main_kobj() must be called
140 * which will perform kobj unregistration and the actual free
141 * will occur during the kobject callback operation
147 __edac_device_free_ctl_info(dev_ctl);
151 EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info);
153 void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info)
155 edac_device_unregister_sysfs_main_kobj(ctl_info);
157 EXPORT_SYMBOL_GPL(edac_device_free_ctl_info);
160 * find_edac_device_by_dev
161 * scans the edac_device list for a specific 'struct device *'
163 * lock to be held prior to call: device_ctls_mutex
166 * pointer to control structure managing 'dev'
167 * NULL if not found on list
169 static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev)
171 struct edac_device_ctl_info *edac_dev;
172 struct list_head *item;
176 list_for_each(item, &edac_device_list) {
177 edac_dev = list_entry(item, struct edac_device_ctl_info, link);
179 if (edac_dev->dev == dev)
187 * add_edac_dev_to_global_list
188 * Before calling this function, caller must
189 * assign a unique value to edac_dev->dev_idx.
191 * lock to be held prior to call: device_ctls_mutex
197 static int add_edac_dev_to_global_list(struct edac_device_ctl_info *edac_dev)
199 struct list_head *item, *insert_before;
200 struct edac_device_ctl_info *rover;
202 insert_before = &edac_device_list;
204 /* Determine if already on the list */
205 rover = find_edac_device_by_dev(edac_dev->dev);
206 if (unlikely(rover != NULL))
209 /* Insert in ascending order by 'dev_idx', so find position */
210 list_for_each(item, &edac_device_list) {
211 rover = list_entry(item, struct edac_device_ctl_info, link);
213 if (rover->dev_idx >= edac_dev->dev_idx) {
214 if (unlikely(rover->dev_idx == edac_dev->dev_idx))
217 insert_before = item;
222 list_add_tail_rcu(&edac_dev->link, insert_before);
226 edac_printk(KERN_WARNING, EDAC_MC,
227 "%s (%s) %s %s already assigned %d\n",
228 dev_name(rover->dev), edac_dev_name(rover),
229 rover->mod_name, rover->ctl_name, rover->dev_idx);
233 edac_printk(KERN_WARNING, EDAC_MC,
234 "bug in low-level driver: attempt to assign\n"
235 " duplicate dev_idx %d in %s()\n", rover->dev_idx,
241 * del_edac_device_from_global_list
243 static void del_edac_device_from_global_list(struct edac_device_ctl_info
246 list_del_rcu(&edac_device->link);
248 /* these are for safe removal of devices from global list while
249 * NMI handlers may be traversing list
252 INIT_LIST_HEAD(&edac_device->link);
256 * edac_device_workq_function
257 * performs the operation scheduled by a workq request
259 * this workq is embedded within an edac_device_ctl_info
260 * structure, that needs to be polled for possible error events.
262 * This operation is to acquire the list mutex lock
263 * (thus preventing insertation or deletion)
264 * and then call the device's poll function IFF this device is
265 * running polled and there is a poll function defined.
267 static void edac_device_workq_function(struct work_struct *work_req)
269 struct delayed_work *d_work = to_delayed_work(work_req);
270 struct edac_device_ctl_info *edac_dev = to_edac_device_ctl_work(d_work);
272 mutex_lock(&device_ctls_mutex);
274 /* If we are being removed, bail out immediately */
275 if (edac_dev->op_state == OP_OFFLINE) {
276 mutex_unlock(&device_ctls_mutex);
280 /* Only poll controllers that are running polled and have a check */
281 if ((edac_dev->op_state == OP_RUNNING_POLL) &&
282 (edac_dev->edac_check != NULL)) {
283 edac_dev->edac_check(edac_dev);
286 mutex_unlock(&device_ctls_mutex);
288 /* Reschedule the workq for the next time period to start again
289 * if the number of msec is for 1 sec, then adjust to the next
290 * whole one second to save timers firing all over the period
291 * between integral seconds
293 if (edac_dev->poll_msec == DEFAULT_POLL_INTERVAL)
294 edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay));
296 edac_queue_work(&edac_dev->work, edac_dev->delay);
300 * edac_device_workq_setup
301 * initialize a workq item for this edac_device instance
302 * passing in the new delay period in msec
304 static void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev,
309 /* take the arg 'msec' and set it into the control structure
310 * to used in the time period calculation
311 * then calc the number of jiffies that represents
313 edac_dev->poll_msec = msec;
314 edac_dev->delay = msecs_to_jiffies(msec);
316 INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function);
318 /* optimize here for the 1 second case, which will be normal value, to
319 * fire ON the 1 second time event. This helps reduce all sorts of
320 * timers firing on sub-second basis, while they are happy
321 * to fire together on the 1 second exactly
323 if (edac_dev->poll_msec == DEFAULT_POLL_INTERVAL)
324 edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay));
326 edac_queue_work(&edac_dev->work, edac_dev->delay);
330 * edac_device_workq_teardown
331 * stop the workq processing on this edac_dev
333 static void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev)
335 if (!edac_dev->edac_check)
338 edac_dev->op_state = OP_OFFLINE;
340 edac_stop_work(&edac_dev->work);
344 * edac_device_reset_delay_period
346 * need to stop any outstanding workq queued up at this time
347 * because we will be resetting the sleep time.
348 * Then restart the workq on the new delay
350 void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev,
353 edac_dev->poll_msec = msec;
354 edac_dev->delay = msecs_to_jiffies(msec);
356 /* See comment in edac_device_workq_setup() above */
357 if (edac_dev->poll_msec == DEFAULT_POLL_INTERVAL)
358 edac_mod_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay));
360 edac_mod_work(&edac_dev->work, edac_dev->delay);
363 int edac_device_alloc_index(void)
365 static atomic_t device_indexes = ATOMIC_INIT(0);
367 return atomic_inc_return(&device_indexes) - 1;
369 EXPORT_SYMBOL_GPL(edac_device_alloc_index);
371 int edac_device_add_device(struct edac_device_ctl_info *edac_dev)
375 #ifdef CONFIG_EDAC_DEBUG
376 if (edac_debug_level >= 3)
377 edac_device_dump_device(edac_dev);
379 mutex_lock(&device_ctls_mutex);
381 if (add_edac_dev_to_global_list(edac_dev))
384 /* set load time so that error rate can be tracked */
385 edac_dev->start_time = jiffies;
387 /* create this instance's sysfs entries */
388 if (edac_device_create_sysfs(edac_dev)) {
389 edac_device_printk(edac_dev, KERN_WARNING,
390 "failed to create sysfs device\n");
394 /* If there IS a check routine, then we are running POLLED */
395 if (edac_dev->edac_check != NULL) {
396 /* This instance is NOW RUNNING */
397 edac_dev->op_state = OP_RUNNING_POLL;
399 edac_device_workq_setup(edac_dev, edac_dev->poll_msec ?: DEFAULT_POLL_INTERVAL);
401 edac_dev->op_state = OP_RUNNING_INTERRUPT;
404 /* Report action taken */
405 edac_device_printk(edac_dev, KERN_INFO,
406 "Giving out device to module %s controller %s: DEV %s (%s)\n",
407 edac_dev->mod_name, edac_dev->ctl_name, edac_dev->dev_name,
408 edac_op_state_to_string(edac_dev->op_state));
410 mutex_unlock(&device_ctls_mutex);
414 /* Some error, so remove the entry from the lsit */
415 del_edac_device_from_global_list(edac_dev);
418 mutex_unlock(&device_ctls_mutex);
421 EXPORT_SYMBOL_GPL(edac_device_add_device);
423 struct edac_device_ctl_info *edac_device_del_device(struct device *dev)
425 struct edac_device_ctl_info *edac_dev;
429 mutex_lock(&device_ctls_mutex);
431 /* Find the structure on the list, if not there, then leave */
432 edac_dev = find_edac_device_by_dev(dev);
433 if (edac_dev == NULL) {
434 mutex_unlock(&device_ctls_mutex);
438 /* mark this instance as OFFLINE */
439 edac_dev->op_state = OP_OFFLINE;
441 /* deregister from global list */
442 del_edac_device_from_global_list(edac_dev);
444 mutex_unlock(&device_ctls_mutex);
446 /* clear workq processing on this instance */
447 edac_device_workq_teardown(edac_dev);
449 /* Tear down the sysfs entries for this instance */
450 edac_device_remove_sysfs(edac_dev);
452 edac_printk(KERN_INFO, EDAC_MC,
453 "Removed device %d for %s %s: DEV %s\n",
455 edac_dev->mod_name, edac_dev->ctl_name, edac_dev_name(edac_dev));
459 EXPORT_SYMBOL_GPL(edac_device_del_device);
461 static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev)
463 return edac_dev->log_ce;
466 static inline int edac_device_get_log_ue(struct edac_device_ctl_info *edac_dev)
468 return edac_dev->log_ue;
471 static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
474 return edac_dev->panic_on_ue;
477 void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev,
478 unsigned int count, int inst_nr, int block_nr,
481 struct edac_device_instance *instance;
482 struct edac_device_block *block = NULL;
487 if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
488 edac_device_printk(edac_dev, KERN_ERR,
489 "INTERNAL ERROR: 'instance' out of range "
490 "(%d >= %d)\n", inst_nr,
491 edac_dev->nr_instances);
495 instance = edac_dev->instances + inst_nr;
497 if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
498 edac_device_printk(edac_dev, KERN_ERR,
499 "INTERNAL ERROR: instance %d 'block' "
500 "out of range (%d >= %d)\n",
502 instance->nr_blocks);
506 if (instance->nr_blocks > 0) {
507 block = instance->blocks + block_nr;
508 block->counters.ce_count += count;
511 /* Propagate the count up the 'totals' tree */
512 instance->counters.ce_count += count;
513 edac_dev->counters.ce_count += count;
515 if (edac_device_get_log_ce(edac_dev))
516 edac_device_printk(edac_dev, KERN_WARNING,
517 "CE: %s instance: %s block: %s count: %d '%s'\n",
518 edac_dev->ctl_name, instance->name,
519 block ? block->name : "N/A", count, msg);
521 EXPORT_SYMBOL_GPL(edac_device_handle_ce_count);
523 void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev,
524 unsigned int count, int inst_nr, int block_nr,
527 struct edac_device_instance *instance;
528 struct edac_device_block *block = NULL;
533 if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
534 edac_device_printk(edac_dev, KERN_ERR,
535 "INTERNAL ERROR: 'instance' out of range "
536 "(%d >= %d)\n", inst_nr,
537 edac_dev->nr_instances);
541 instance = edac_dev->instances + inst_nr;
543 if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
544 edac_device_printk(edac_dev, KERN_ERR,
545 "INTERNAL ERROR: instance %d 'block' "
546 "out of range (%d >= %d)\n",
548 instance->nr_blocks);
552 if (instance->nr_blocks > 0) {
553 block = instance->blocks + block_nr;
554 block->counters.ue_count += count;
557 /* Propagate the count up the 'totals' tree */
558 instance->counters.ue_count += count;
559 edac_dev->counters.ue_count += count;
561 if (edac_device_get_log_ue(edac_dev))
562 edac_device_printk(edac_dev, KERN_EMERG,
563 "UE: %s instance: %s block: %s count: %d '%s'\n",
564 edac_dev->ctl_name, instance->name,
565 block ? block->name : "N/A", count, msg);
567 if (edac_device_get_panic_on_ue(edac_dev))
568 panic("EDAC %s: UE instance: %s block %s count: %d '%s'\n",
569 edac_dev->ctl_name, instance->name,
570 block ? block->name : "N/A", count, msg);
572 EXPORT_SYMBOL_GPL(edac_device_handle_ue_count);