edac_device_sysfs.c

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	block = to_block(kobj);

	/* map from 'block kobj' to 'block->instance->controller->main_kobj'
	 * now 'release' the block kobject
	 */
	kobject_put(&block->instance->ctl->kobj);
}


/* Function to 'show' fields from the edac_dev 'block' structure */
static ssize_t edac_dev_block_show(struct kobject *kobj,
				struct attribute *attr, char *buffer)
{
	struct edac_dev_sysfs_block_attribute *block_attr =
						to_block_attr(attr);

	if (block_attr->show)
		return block_attr->show(kobj, attr, buffer);
	return -EIO;
}

/* Function to 'store' fields into the edac_dev 'block' structure */
static ssize_t edac_dev_block_store(struct kobject *kobj,
				struct attribute *attr,
				const char *buffer, size_t count)
{
	struct edac_dev_sysfs_block_attribute *block_attr;

	block_attr = to_block_attr(attr);

	if (block_attr->store)
		return block_attr->store(kobj, attr, buffer, count);
	return -EIO;
}

/* edac_dev file operations for a 'block' */
static struct sysfs_ops device_block_ops = {
	.show = edac_dev_block_show,
	.store = edac_dev_block_store
};

#define BLOCK_ATTR(_name,_mode,_show,_store)        \
static struct edac_dev_sysfs_block_attribute attr_block_##_name = {	\
	.attr = {.name = __stringify(_name), .mode = _mode },   \
	.show   = _show,                                        \
	.store  = _store,                                       \
};

BLOCK_ATTR(ce_count, S_IRUGO, block_ce_count_show, NULL);
BLOCK_ATTR(ue_count, S_IRUGO, block_ue_count_show, NULL);

/* list of edac_dev 'block' attributes */
static struct edac_dev_sysfs_block_attribute *device_block_attr[] = {
	&attr_block_ce_count,
	&attr_block_ue_count,
	NULL,
};

/* The 'ktype' for each edac_dev 'block' */
static struct kobj_type ktype_block_ctrl = {
	.release = edac_device_ctrl_block_release,
	.sysfs_ops = &device_block_ops,
	.default_attrs = (struct attribute **)device_block_attr,
};

/* block ctor/dtor  code */

/*
 * edac_device_create_block
 */
static int edac_device_create_block(struct edac_device_ctl_info *edac_dev,
				struct edac_device_instance *instance,
				struct edac_device_block *block)
{
	int i;
	int err;
	struct edac_dev_sysfs_block_attribute *sysfs_attrib;
	struct kobject *main_kobj;

	debugf4("%s() Instance '%s' inst_p=%p  block '%s'  block_p=%p\n",
		__func__, instance->name, instance, block->name, block);
	debugf4("%s() block kobj=%p  block kobj->parent=%p\n",
		__func__, &block->kobj, &block->kobj.parent);

	/* init this block's kobject */
	memset(&block->kobj, 0, sizeof(struct kobject));
	block->kobj.parent = &instance->kobj;
	block->kobj.ktype = &ktype_block_ctrl;

	err = kobject_set_name(&block->kobj, "%s", block->name);
	if (err)
		return err;

	/* bump the main kobject's reference count for this controller
	 * and this instance is dependant on the main
	 */
	main_kobj = kobject_get(&edac_dev->kobj);
	if (!main_kobj) {
		err = -ENODEV;
		goto err_out;
	}

	/* Add this block's kobject */
	err = kobject_register(&block->kobj);
	if (err) {
		debugf1("%s() Failed to register instance '%s'\n",
			__func__, block->name);
		kobject_put(main_kobj);
		err = -ENODEV;
		goto err_out;
	}

	/* If there are driver level block attributes, then added them
	 * to the block kobject
	 */
	sysfs_attrib = block->block_attributes;
	if (sysfs_attrib && block->nr_attribs) {
		for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {

			debugf4("%s() creating block attrib='%s' "
				"attrib->%p to kobj=%p\n",
				__func__,
				sysfs_attrib->attr.name,
				sysfs_attrib, &block->kobj);

			/* Create each block_attribute file */
			err = sysfs_create_file(&block->kobj,
				&sysfs_attrib->attr);
			if (err)
				goto err_on_attrib;
		}
	}

	return 0;

	/* Error unwind stack */
err_on_attrib:
	kobject_unregister(&block->kobj);

err_out:
	return err;
}

/*
 * edac_device_delete_block(edac_dev,block);
 */
static void edac_device_delete_block(struct edac_device_ctl_info *edac_dev,
				struct edac_device_block *block)
{
	struct edac_dev_sysfs_block_attribute *sysfs_attrib;
	int i;

	/* if this block has 'attributes' then we need to iterate over the list
	 * and 'remove' the attributes on this block
	 */
	sysfs_attrib = block->block_attributes;
	if (sysfs_attrib && block->nr_attribs) {
		for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {

			/* remove each block_attrib file */
			sysfs_remove_file(&block->kobj,
				(struct attribute *) sysfs_attrib);
		}
	}

	/* unregister this block's kobject, SEE:
	 *	edac_device_ctrl_block_release() callback operation
	 */
	kobject_unregister(&block->kobj);
}

/* instance ctor/dtor code */

/*
 * edac_device_create_instance
 *	create just one instance of an edac_device 'instance'
 */
static int edac_device_create_instance(struct edac_device_ctl_info *edac_dev,
				int idx)
{
	int i, j;
	int err;
	struct edac_device_instance *instance;
	struct kobject *main_kobj;

	instance = &edac_dev->instances[idx];

	/* Init the instance's kobject */
	memset(&instance->kobj, 0, sizeof(struct kobject));

	/* set this new device under the edac_device main kobject */
	instance->kobj.parent = &edac_dev->kobj;
	instance->kobj.ktype = &ktype_instance_ctrl;
	instance->ctl = edac_dev;

	err = kobject_set_name(&instance->kobj, "%s", instance->name);
	if (err)
		goto err_out;

	/* bump the main kobject's reference count for this controller
	 * and this instance is dependant on the main
	 */
	main_kobj = kobject_get(&edac_dev->kobj);
	if (!main_kobj) {
		err = -ENODEV;
		goto err_out;
	}

	/* Formally register this instance's kobject */
	err = kobject_register(&instance->kobj);
	if (err != 0) {
		debugf2("%s() Failed to register instance '%s'\n",
			__func__, instance->name);
		kobject_put(main_kobj);
		goto err_out;
	}

	debugf4("%s() now register '%d' blocks for instance %d\n",
		__func__, instance->nr_blocks, idx);

	/* register all blocks of this instance */
	for (i = 0; i < instance->nr_blocks; i++) {
		err = edac_device_create_block(edac_dev, instance,
						&instance->blocks[i]);
		if (err) {
			/* If any fail, remove all previous ones */
			for (j = 0; j < i; j++)
				edac_device_delete_block(edac_dev,
							&instance->blocks[j]);
			goto err_release_instance_kobj;
		}
	}

	debugf4("%s() Registered instance %d '%s' kobject\n",
		__func__, idx, instance->name);

	return 0;

	/* error unwind stack */
err_release_instance_kobj:
	kobject_unregister(&instance->kobj);

err_out:
	return err;
}

/*
 * edac_device_remove_instance
 *	remove an edac_device instance
 */
static void edac_device_delete_instance(struct edac_device_ctl_info *edac_dev,
					int idx)
{
	struct edac_device_instance *instance;
	int i;

	instance = &edac_dev->instances[idx];

	/* unregister all blocks in this instance */
	for (i = 0; i < instance->nr_blocks; i++)
		edac_device_delete_block(edac_dev, &instance->blocks[i]);

	/* unregister this instance's kobject, SEE:
	 *	edac_device_ctrl_instance_release() for callback operation
	 */
	kobject_unregister(&instance->kobj);
}

/*
 * edac_device_create_instances
 *	create the first level of 'instances' for this device
 *	(ie  'cache' might have 'cache0', 'cache1', 'cache2', etc
 */
static int edac_device_create_instances(struct edac_device_ctl_info *edac_dev)
{
	int i, j;
	int err;

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

	/* iterate over creation of the instances */
	for (i = 0; i < edac_dev->nr_instances; i++) {
		err = edac_device_create_instance(edac_dev, i);
		if (err) {
			/* unwind previous instances on error */
			for (j = 0; j < i; j++)
				edac_device_delete_instance(edac_dev, j);
			return err;
		}
	}

	return 0;
}

/*
 * edac_device_delete_instances(edac_dev);
 *	unregister all the kobjects of the instances
 */
static void edac_device_delete_instances(struct edac_device_ctl_info *edac_dev)
{
	int i;

	/* iterate over creation of the instances */
	for (i = 0; i < edac_dev->nr_instances; i++)
		edac_device_delete_instance(edac_dev, i);
}

/* edac_dev sysfs ctor/dtor  code */

/*
 * edac_device_add_main_sysfs_attributes
 *	add some attributes to this instance's main kobject
 */
static int edac_device_add_main_sysfs_attributes(
			struct edac_device_ctl_info *edac_dev)
{
	struct edac_dev_sysfs_attribute *sysfs_attrib;
	int err = 0;

	sysfs_attrib = edac_dev->sysfs_attributes;
	if (sysfs_attrib) {
		/* iterate over the array and create an attribute for each
		 * entry in the list
		 */
		while (sysfs_attrib->attr.name != NULL) {
			err = sysfs_create_file(&edac_dev->kobj,
				(struct attribute*) sysfs_attrib);
			if (err)
				goto err_out;

			sysfs_attrib++;
		}
	}

err_out:
	return err;
}

/*
 * edac_device_remove_main_sysfs_attributes
 *	remove any attributes to this instance's main kobject
 */
static void edac_device_remove_main_sysfs_attributes(
			struct edac_device_ctl_info *edac_dev)
{
	struct edac_dev_sysfs_attribute *sysfs_attrib;

	/* if there are main attributes, defined, remove them. First,
	 * point to the start of the array and iterate over it
	 * removing each attribute listed from this device's instance's kobject
	 */
	sysfs_attrib = edac_dev->sysfs_attributes;
	if (sysfs_attrib) {
		while (sysfs_attrib->attr.name != NULL) {
			sysfs_remove_file(&edac_dev->kobj,
					(struct attribute *) sysfs_attrib);
			sysfs_attrib++;
		}
	}
}

/*
 * edac_device_create_sysfs() Constructor
 *
 * accept a created edac_device control structure
 * and 'export' it to sysfs. The 'main' kobj should already have been
 * created. 'instance' and 'block' kobjects should be registered
 * along with any 'block' attributes from the low driver. In addition,
 * the main attributes (if any) are connected to the main kobject of
 * the control structure.
 *
 * Return:
 *	0	Success
 *	!0	Failure
 */
int edac_device_create_sysfs(struct edac_device_ctl_info *edac_dev)
{
	int err;
	struct kobject *edac_kobj = &edac_dev->kobj;

	debugf0("%s() idx=%d\n", __func__, edac_dev->dev_idx);

	/*  go create any main attributes callers wants */
	err = edac_device_add_main_sysfs_attributes(edac_dev);
	if (err) {
		debugf0("%s() failed to add sysfs attribs\n", __func__);
		goto err_out;
	}

	/* create a symlink from the edac device
	 * to the platform 'device' being used for this
	 */
	err = sysfs_create_link(edac_kobj,
				&edac_dev->dev->kobj, EDAC_DEVICE_SYMLINK);
	if (err) {
		debugf0("%s() sysfs_create_link() returned err= %d\n",
			__func__, err);
		goto err_remove_main_attribs;
	}

	/* Create the first level instance directories
	 * In turn, the nested blocks beneath the instances will
	 * be registered as well
	 */
	err = edac_device_create_instances(edac_dev);
	if (err) {
		debugf0("%s() edac_device_create_instances() "
			"returned err= %d\n", __func__, err);
		goto err_remove_link;
	}


	debugf4("%s() create-instances done, idx=%d\n",
		__func__, edac_dev->dev_idx);

	return 0;

	/* Error unwind stack */
err_remove_link:
	/* remove the sym link */
	sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);

err_remove_main_attribs:
	edac_device_remove_main_sysfs_attributes(edac_dev);

err_out:
	return err;
}

/*
 * edac_device_remove_sysfs() destructor
 *
 * given an edac_device struct, tear down the kobject resources
 */
void edac_device_remove_sysfs(struct edac_device_ctl_info *edac_dev)
{
	debugf0("%s()\n", __func__);

	/* remove any main attributes for this device */
	edac_device_remove_main_sysfs_attributes(edac_dev);

	/* remove the device sym link */
	sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);

	/* walk the instance/block kobject tree, deconstructing it */
	edac_device_delete_instances(edac_dev);
}