edac_device.c

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 * edac_device_find
 *	Search for a edac_device_ctl_info structure whose index is 'idx'.
 *
 * If found, return a pointer to the structure.
 * Else return NULL.
 *
 * Caller must hold device_ctls_mutex.
 */
struct edac_device_ctl_info *edac_device_find(int idx)
{
	struct list_head *item;
	struct edac_device_ctl_info *edac_dev;

	/* Iterate over list, looking for exact match of ID */
	list_for_each(item, &edac_device_list) {
		edac_dev = list_entry(item, struct edac_device_ctl_info, link);

		if (edac_dev->dev_idx >= idx) {
			if (edac_dev->dev_idx == idx)
				return edac_dev;

			/* not on list, so terminate early */
			break;
		}
	}

	return NULL;
}
EXPORT_SYMBOL_GPL(edac_device_find);

/*
 * edac_device_workq_function
 *	performs the operation scheduled by a workq request
 *
 *	this workq is embedded within an edac_device_ctl_info
 *	structure, that needs to be polled for possible error events.
 *
 *	This operation is to acquire the list mutex lock
 *	(thus preventing insertation or deletion)
 *	and then call the device's poll function IFF this device is
 *	running polled and there is a poll function defined.
 */
static void edac_device_workq_function(struct work_struct *work_req)
{
	struct delayed_work *d_work = (struct delayed_work *)work_req;
	struct edac_device_ctl_info *edac_dev = to_edac_device_ctl_work(d_work);

	mutex_lock(&device_ctls_mutex);

	/* Only poll controllers that are running polled and have a check */
	if ((edac_dev->op_state == OP_RUNNING_POLL) &&
		(edac_dev->edac_check != NULL)) {
			edac_dev->edac_check(edac_dev);
	}

	mutex_unlock(&device_ctls_mutex);

	/* Reschedule the workq for the next time period to start again
	 * if the number of msec is for 1 sec, then adjust to the next
	 * whole one second to save timers fireing all over the period
	 * between integral seconds
	 */
	if (edac_dev->poll_msec == 1000)
		queue_delayed_work(edac_workqueue, &edac_dev->work,
				round_jiffies(edac_dev->delay));
	else
		queue_delayed_work(edac_workqueue, &edac_dev->work,
				edac_dev->delay);
}

/*
 * edac_device_workq_setup
 *	initialize a workq item for this edac_device instance
 *	passing in the new delay period in msec
 */
void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev,
				unsigned msec)
{
	debugf0("%s()\n", __func__);

	/* take the arg 'msec' and set it into the control structure
	 * to used in the time period calculation
	 * then calc the number of jiffies that represents
	 */
	edac_dev->poll_msec = msec;
	edac_dev->delay = msecs_to_jiffies(msec);

	INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function);

	/* optimize here for the 1 second case, which will be normal value, to
	 * fire ON the 1 second time event. This helps reduce all sorts of
	 * timers firing on sub-second basis, while they are happy
	 * to fire together on the 1 second exactly
	 */
	if (edac_dev->poll_msec == 1000)
		queue_delayed_work(edac_workqueue, &edac_dev->work,
				round_jiffies(edac_dev->delay));
	else
		queue_delayed_work(edac_workqueue, &edac_dev->work,
				edac_dev->delay);
}

/*
 * edac_device_workq_teardown
 *	stop the workq processing on this edac_dev
 */
void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev)
{
	int status;

	status = cancel_delayed_work(&edac_dev->work);
	if (status == 0) {
		/* workq instance might be running, wait for it */
		flush_workqueue(edac_workqueue);
	}
}

/*
 * edac_device_reset_delay_period
 *
 *	need to stop any outstanding workq queued up at this time
 *	because we will be resetting the sleep time.
 *	Then restart the workq on the new delay
 */
void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev,
					unsigned long value)
{
	/* cancel the current workq request, without the mutex lock */
	edac_device_workq_teardown(edac_dev);

	/* acquire the mutex before doing the workq setup */
	mutex_lock(&device_ctls_mutex);

	/* restart the workq request, with new delay value */
	edac_device_workq_setup(edac_dev, value);

	mutex_unlock(&device_ctls_mutex);
}

/**
 * edac_device_add_device: Insert the 'edac_dev' structure into the
 * edac_device global list and create sysfs entries associated with
 * edac_device structure.
 * @edac_device: pointer to the edac_device structure to be added to the list
 * 'edac_device' structure.
 *
 * Return:
 *	0	Success
 *	!0	Failure
 */
int edac_device_add_device(struct edac_device_ctl_info *edac_dev)
{
	debugf0("%s()\n", __func__);

#ifdef CONFIG_EDAC_DEBUG
	if (edac_debug_level >= 3)
		edac_device_dump_device(edac_dev);
#endif
	mutex_lock(&device_ctls_mutex);

	if (add_edac_dev_to_global_list(edac_dev))
		goto fail0;

	/* set load time so that error rate can be tracked */
	edac_dev->start_time = jiffies;

	/* create this instance's sysfs entries */
	if (edac_device_create_sysfs(edac_dev)) {
		edac_device_printk(edac_dev, KERN_WARNING,
					"failed to create sysfs device\n");
		goto fail1;
	}

	/* If there IS a check routine, then we are running POLLED */
	if (edac_dev->edac_check != NULL) {
		/* This instance is NOW RUNNING */
		edac_dev->op_state = OP_RUNNING_POLL;

		/*
		 * enable workq processing on this instance,
		 * default = 1000 msec
		 */
		edac_device_workq_setup(edac_dev, 1000);
	} else {
		edac_dev->op_state = OP_RUNNING_INTERRUPT;
	}

	/* Report action taken */
	edac_device_printk(edac_dev, KERN_INFO,
				"Giving out device to module '%s' controller "
				"'%s': DEV '%s' (%s)\n",
				edac_dev->mod_name,
				edac_dev->ctl_name,
				dev_name(edac_dev),
				edac_op_state_to_string(edac_dev->op_state));

	mutex_unlock(&device_ctls_mutex);
	return 0;

fail1:
	/* Some error, so remove the entry from the lsit */
	del_edac_device_from_global_list(edac_dev);

fail0:
	mutex_unlock(&device_ctls_mutex);
	return 1;
}
EXPORT_SYMBOL_GPL(edac_device_add_device);

/**
 * edac_device_del_device:
 *	Remove sysfs entries for specified edac_device structure and
 *	then remove edac_device structure from global list
 *
 * @pdev:
 *	Pointer to 'struct device' representing edac_device
 *	structure to remove.
 *
 * Return:
 *	Pointer to removed edac_device structure,
 *	OR NULL if device not found.
 */
struct edac_device_ctl_info *edac_device_del_device(struct device *dev)
{
	struct edac_device_ctl_info *edac_dev;

	debugf0("%s()\n", __func__);

	mutex_lock(&device_ctls_mutex);

	/* Find the structure on the list, if not there, then leave */
	edac_dev = find_edac_device_by_dev(dev);
	if (edac_dev == NULL) {
		mutex_unlock(&device_ctls_mutex);
		return NULL;
	}

	/* mark this instance as OFFLINE */
	edac_dev->op_state = OP_OFFLINE;

	/* clear workq processing on this instance */
	edac_device_workq_teardown(edac_dev);

	/* deregister from global list */
	del_edac_device_from_global_list(edac_dev);

	mutex_unlock(&device_ctls_mutex);

	/* Tear down the sysfs entries for this instance */
	edac_device_remove_sysfs(edac_dev);

	edac_printk(KERN_INFO, EDAC_MC,
		"Removed device %d for %s %s: DEV %s\n",
		edac_dev->dev_idx,
		edac_dev->mod_name, edac_dev->ctl_name, dev_name(edac_dev));

	return edac_dev;
}
EXPORT_SYMBOL_GPL(edac_device_del_device);

static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev)
{
	return edac_dev->log_ce;
}

static inline int edac_device_get_log_ue(struct edac_device_ctl_info *edac_dev)
{
	return edac_dev->log_ue;
}

static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
					*edac_dev)
{
	return edac_dev->panic_on_ue;
}

/*
 * edac_device_handle_ce
 *	perform a common output and handling of an 'edac_dev' CE event
 */
void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
			int inst_nr, int block_nr, const char *msg)
{
	struct edac_device_instance *instance;
	struct edac_device_block *block = NULL;

	if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
		edac_device_printk(edac_dev, KERN_ERR,
				"INTERNAL ERROR: 'instance' out of range "
				"(%d >= %d)\n", inst_nr,
				edac_dev->nr_instances);
		return;
	}

	instance = edac_dev->instances + inst_nr;

	if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
		edac_device_printk(edac_dev, KERN_ERR,
				"INTERNAL ERROR: instance %d 'block' "
				"out of range (%d >= %d)\n",
				inst_nr, block_nr,
				instance->nr_blocks);
		return;
	}

	if (instance->nr_blocks > 0) {
		block = instance->blocks + block_nr;
		block->counters.ce_count++;
	}

	/* Propogate the count up the 'totals' tree */
	instance->counters.ce_count++;
	edac_dev->counters.ce_count++;

	if (edac_device_get_log_ce(edac_dev))
		edac_device_printk(edac_dev, KERN_WARNING,
				"CE: %s instance: %s block: %s '%s'\n",
				edac_dev->ctl_name, instance->name,
				block ? block->name : "N/A", msg);
}
EXPORT_SYMBOL_GPL(edac_device_handle_ce);

/*
 * edac_device_handle_ue
 *	perform a common output and handling of an 'edac_dev' UE event
 */
void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
			int inst_nr, int block_nr, const char *msg)
{
	struct edac_device_instance *instance;
	struct edac_device_block *block = NULL;

	if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
		edac_device_printk(edac_dev, KERN_ERR,
				"INTERNAL ERROR: 'instance' out of range "
				"(%d >= %d)\n", inst_nr,
				edac_dev->nr_instances);
		return;
	}

	instance = edac_dev->instances + inst_nr;

	if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
		edac_device_printk(edac_dev, KERN_ERR,
				"INTERNAL ERROR: instance %d 'block' "
				"out of range (%d >= %d)\n",
				inst_nr, block_nr,
				instance->nr_blocks);
		return;
	}

	if (instance->nr_blocks > 0) {
		block = instance->blocks + block_nr;
		block->counters.ue_count++;
	}

	/* Propogate the count up the 'totals' tree */
	instance->counters.ue_count++;
	edac_dev->counters.ue_count++;

	if (edac_device_get_log_ue(edac_dev))
		edac_device_printk(edac_dev, KERN_EMERG,
				"UE: %s instance: %s block: %s '%s'\n",
				edac_dev->ctl_name, instance->name,
				block ? block->name : "N/A", msg);

	if (edac_device_get_panic_on_ue(edac_dev))
		panic("EDAC %s: UE instance: %s block %s '%s'\n",
			edac_dev->ctl_name, instance->name,
			block ? block->name : "N/A", msg);
}
EXPORT_SYMBOL_GPL(edac_device_handle_ue);