edac_mc_sysfs.c

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static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data, "%d\n", mci->ue_noinfo_count);
}

static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
}

static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data, "%s\n", mci->ctl_name);
}

static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
{
	int total_pages, csrow_idx;

	for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
		csrow_idx++) {
		struct csrow_info *csrow = &mci->csrows[csrow_idx];

		if (!csrow->nr_pages)
			continue;

		total_pages += csrow->nr_pages;
	}

	return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
}

#define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
#define to_mcidev_attr(a) container_of(a,struct mcidev_sysfs_attribute,attr)

/* MCI show/store functions for top most object */
static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
			char *buffer)
{
	struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
	struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);

	if (mcidev_attr->show)
		return mcidev_attr->show(mem_ctl_info, buffer);

	return -EIO;
}

static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
			const char *buffer, size_t count)
{
	struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
	struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);

	if (mcidev_attr->store)
		return mcidev_attr->store(mem_ctl_info, buffer, count);

	return -EIO;
}

/* Intermediate show/store table */
static struct sysfs_ops mci_ops = {
	.show = mcidev_show,
	.store = mcidev_store
};

#define MCIDEV_ATTR(_name,_mode,_show,_store)			\
static struct mcidev_sysfs_attribute mci_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.show   = _show,					\
	.store  = _store,					\
};

/* default Control file */
MCIDEV_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);

/* default Attribute files */
MCIDEV_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
MCIDEV_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
MCIDEV_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
MCIDEV_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
MCIDEV_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
MCIDEV_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
MCIDEV_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);

/* memory scrubber attribute file */
MCIDEV_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
	mci_sdram_scrub_rate_store);

static struct mcidev_sysfs_attribute *mci_attr[] = {
	&mci_attr_reset_counters,
	&mci_attr_mc_name,
	&mci_attr_size_mb,
	&mci_attr_seconds_since_reset,
	&mci_attr_ue_noinfo_count,
	&mci_attr_ce_noinfo_count,
	&mci_attr_ue_count,
	&mci_attr_ce_count,
	&mci_attr_sdram_scrub_rate,
	NULL
};


/*
 * Release of a MC controlling instance
 *
 *	each MC control instance has the following resources upon entry:
 *		a) a ref count on the top memctl kobj
 *		b) a ref count on this module
 *
 *	this function must decrement those ref counts and then
 *	issue a free on the instance's memory
 */
static void edac_mci_control_release(struct kobject *kobj)
{
	struct mem_ctl_info *mci;

	mci = to_mci(kobj);

	debugf0("%s() mci instance idx=%d releasing\n", __func__, mci->mc_idx);

	/* decrement the module ref count */
	module_put(mci->owner);

	/* free the mci instance memory here */
	kfree(mci);
}

static struct kobj_type ktype_mci = {
	.release = edac_mci_control_release,
	.sysfs_ops = &mci_ops,
	.default_attrs = (struct attribute **)mci_attr,
};

/* show/store, tables, etc for the MC kset */


struct memctrl_dev_attribute {
	struct attribute attr;
	void *value;
	 ssize_t(*show) (void *, char *);
	 ssize_t(*store) (void *, const char *, size_t);
};

/* Set of show/store abstract level functions for memory control object */
static ssize_t memctrl_dev_show(struct kobject *kobj,
				struct attribute *attr, char *buffer)
{
	struct memctrl_dev_attribute *memctrl_dev;
	memctrl_dev = (struct memctrl_dev_attribute *)attr;

	if (memctrl_dev->show)
		return memctrl_dev->show(memctrl_dev->value, buffer);

	return -EIO;
}

static ssize_t memctrl_dev_store(struct kobject *kobj, struct attribute *attr,
				 const char *buffer, size_t count)
{
	struct memctrl_dev_attribute *memctrl_dev;
	memctrl_dev = (struct memctrl_dev_attribute *)attr;

	if (memctrl_dev->store)
		return memctrl_dev->store(memctrl_dev->value, buffer, count);

	return -EIO;
}

static struct sysfs_ops memctrlfs_ops = {
	.show = memctrl_dev_show,
	.store = memctrl_dev_store
};

#define MEMCTRL_ATTR(_name, _mode, _show, _store)			\
static struct memctrl_dev_attribute attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.value  = &_name,					\
	.show   = _show,					\
	.store  = _store,					\
};

#define MEMCTRL_STRING_ATTR(_name, _data, _mode, _show, _store)	\
static struct memctrl_dev_attribute attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.value  = _data,					\
	.show   = _show,					\
	.store  = _store,					\
};

/* csrow<id> control files */
MEMCTRL_ATTR(edac_mc_panic_on_ue,
	S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);

MEMCTRL_ATTR(edac_mc_log_ue,
	S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);

MEMCTRL_ATTR(edac_mc_log_ce,
	S_IRUGO | S_IWUSR, memctrl_int_show, memctrl_int_store);

MEMCTRL_ATTR(edac_mc_poll_msec,
	S_IRUGO | S_IWUSR, memctrl_int_show, poll_msec_int_store);

/* Base Attributes of the memory ECC object */
static struct memctrl_dev_attribute *memctrl_attr[] = {
	&attr_edac_mc_panic_on_ue,
	&attr_edac_mc_log_ue,
	&attr_edac_mc_log_ce,
	&attr_edac_mc_poll_msec,
	NULL,
};


/* the ktype for the mc_kset internal kobj */
static struct kobj_type ktype_mc_set_attribs = {
	.sysfs_ops = &memctrlfs_ops,
	.default_attrs = (struct attribute **)memctrl_attr,
};

/* EDAC memory controller sysfs kset:
 *	/sys/devices/system/edac/mc
 */
static struct kset mc_kset = {
	.kobj = {.ktype = &ktype_mc_set_attribs },
	.ktype = &ktype_mci,
};


/*
 * edac_mc_register_sysfs_main_kobj
 *
 *	setups and registers the main kobject for each mci
 */
int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
{
	struct kobject *kobj_mci;
	int err;

	debugf1("%s()\n", __func__);

	kobj_mci = &mci->edac_mci_kobj;

	/* Init the mci's kobject */
	memset(kobj_mci, 0, sizeof(*kobj_mci));

	/* this instance become part of the mc_kset */
	kobj_mci->kset = &mc_kset;

	/* set the name of the mc<id> object */
	err = kobject_set_name(kobj_mci, "mc%d", mci->mc_idx);
	if (err)
		goto fail_out;

	/* Record which module 'owns' this control structure
	 * and bump the ref count of the module
	 */
	mci->owner = THIS_MODULE;

	/* bump ref count on this module */
	if (!try_module_get(mci->owner)) {
		err = -ENODEV;
		goto fail_out;
	}

	/* register the mc<id> kobject to the mc_kset */
	err = kobject_register(kobj_mci);
	if (err) {
		debugf1("%s()Failed to register '.../edac/mc%d'\n",
			__func__, mci->mc_idx);
		goto kobj_reg_fail;
	}

	/* At this point, to 'free' the control struct,
	 * edac_mc_unregister_sysfs_main_kobj() must be used
	 */

	debugf1("%s() Registered '.../edac/mc%d' kobject\n",
		__func__, mci->mc_idx);

	return 0;

	/* Error exit stack */

kobj_reg_fail:
	module_put(mci->owner);

fail_out:
	return err;
}

/*
 * edac_mc_register_sysfs_main_kobj
 *
 *	tears down and the main mci kobject from the mc_kset
 */
void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
{
	/* delete the kobj from the mc_kset */
	kobject_unregister(&mci->edac_mci_kobj);
}

#define EDAC_DEVICE_SYMLINK	"device"

/*
 * edac_create_mci_instance_attributes
 *	create MC driver specific attributes at the topmost level
 *	directory of this mci instance.
 */
static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci)
{
	int err;
	struct mcidev_sysfs_attribute *sysfs_attrib;

	/* point to the start of the array and iterate over it
	 * adding each attribute listed to this mci instance's kobject
	 */
	sysfs_attrib = mci->mc_driver_sysfs_attributes;

	while (sysfs_attrib && sysfs_attrib->attr.name) {
		err = sysfs_create_file(&mci->edac_mci_kobj,
					(struct attribute*) sysfs_attrib);
		if (err) {
			return err;
		}

		sysfs_attrib++;
	}

	return 0;
}

/*
 * edac_remove_mci_instance_attributes
 *	remove MC driver specific attributes at the topmost level
 *	directory of this mci instance.
 */
static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci)
{
	struct mcidev_sysfs_attribute *sysfs_attrib;

	/* point to the start of the array and iterate over it
	 * adding each attribute listed to this mci instance's kobject
	 */
	sysfs_attrib = mci->mc_driver_sysfs_attributes;

	/* loop if there are attributes and until we hit a NULL entry */
	while (sysfs_attrib && sysfs_attrib->attr.name) {
		sysfs_remove_file(&mci->edac_mci_kobj,
					(struct attribute *) sysfs_attrib);
		sysfs_attrib++;
	}
}


/*
 * Create a new Memory Controller kobject instance,
 *	mc<id> under the 'mc' directory
 *
 * Return:
 *	0	Success
 *	!0	Failure
 */
int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
{
	int i;
	int err;
	struct csrow_info *csrow;
	struct kobject *kobj_mci = &mci->edac_mci_kobj;

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

	/* create a symlink for the device */
	err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
				EDAC_DEVICE_SYMLINK);
	if (err) {
		debugf1("%s() failure to create symlink\n", __func__);
		goto fail0;
	}

	/* If the low level driver desires some attributes,
	 * then create them now for the driver.
	 */
	if (mci->mc_driver_sysfs_attributes) {
		err = edac_create_mci_instance_attributes(mci);
		if (err) {
			debugf1("%s() failure to create mci attributes\n",
				__func__);
			goto fail0;
		}
	}

	/* Make directories for each CSROW object under the mc<id> kobject
	 */
	for (i = 0; i < mci->nr_csrows; i++) {
		csrow = &mci->csrows[i];

		/* Only expose populated CSROWs */
		if (csrow->nr_pages > 0) {
			err = edac_create_csrow_object(mci, csrow, i);
			if (err) {
				debugf1("%s() failure: create csrow %d obj\n",
					__func__, i);
				goto fail1;
			}
		}
	}

	return 0;

	/* CSROW error: backout what has already been registered,  */
fail1:
	for (i--; i >= 0; i--) {
		if (csrow->nr_pages > 0) {
			kobject_unregister(&mci->csrows[i].kobj);
		}
	}

	/* remove the mci instance's attributes, if any */
	edac_remove_mci_instance_attributes(mci);

	/* remove the symlink */
	sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);

fail0:
	return err;
}

/*
 * remove a Memory Controller instance
 */
void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
{
	int i;

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

	/* remove all csrow kobjects */
	for (i = 0; i < mci->nr_csrows; i++) {
		if (mci->csrows[i].nr_pages > 0) {
			debugf0("%s()  unreg csrow-%d\n", __func__, i);
			kobject_unregister(&mci->csrows[i].kobj);
		}
	}

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

	/* remove the symlink */
	sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);

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

	/* remove this mci instance's attribtes */
	edac_remove_mci_instance_attributes(mci);

	debugf0("%s()  unregister this mci kobj\n", __func__);

	/* unregister this instance's kobject */
	kobject_unregister(&mci->edac_mci_kobj);
}




/*
 * edac_setup_sysfs_mc_kset(void)
 *
 * Initialize the mc_kset for the 'mc' entry
 *	This requires creating the top 'mc' directory with a kset
 *	and its controls/attributes.
 *
 *	To this 'mc' kset, instance 'mci' will be grouped as children.
 *
 * Return:  0 SUCCESS
 *         !0 FAILURE error code
 */
int edac_sysfs_setup_mc_kset(void)
{
	int err = 0;
	struct sysdev_class *edac_class;

	debugf1("%s()\n", __func__);

	/* get the /sys/devices/system/edac class reference */
	edac_class = edac_get_edac_class();
	if (edac_class == NULL) {
		debugf1("%s() no edac_class error=%d\n", __func__, err);
		goto fail_out;
	}

	/* Init the MC's kobject */
	kobject_set_name(&mc_kset.kobj, "mc");
	mc_kset.kobj.parent = &edac_class->kset.kobj;

	/* register the mc_kset */
	err = kset_register(&mc_kset);
	if (err) {
		debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
		goto fail_out;
	}

	debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);

	return 0;


	/* error unwind stack */
fail_out:
	return err;
}

/*
 * edac_sysfs_teardown_mc_kset
 *
 *	deconstruct the mc_ket for memory controllers
 */
void edac_sysfs_teardown_mc_kset(void)
{
	kset_unregister(&mc_kset);
}