path: root/drivers/nvme/host/sysfs.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Sysfs interface for the NVMe core driver.
 *
 * Copyright (c) 2011-2014, Intel Corporation.
 */

#include <linux/nvme-auth.h>

#include "nvme.h"
#include "fabrics.h"

static ssize_t nvme_sysfs_reset(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
	int ret;

	ret = nvme_reset_ctrl_sync(ctrl);
	if (ret < 0)
		return ret;
	return count;
}
static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);

static ssize_t nvme_sysfs_rescan(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	nvme_queue_scan(ctrl);
	return count;
}
static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);

static ssize_t nvme_adm_passthru_err_log_enabled_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	return sysfs_emit(buf,
			  ctrl->passthru_err_log_enabled ? "on\n" : "off\n");
}

static ssize_t nvme_adm_passthru_err_log_enabled_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
	bool passthru_err_log_enabled;
	int err;

	err = kstrtobool(buf, &passthru_err_log_enabled);
	if (err)
		return -EINVAL;

	ctrl->passthru_err_log_enabled = passthru_err_log_enabled;

	return count;
}

static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev)
{
	struct gendisk *disk = dev_to_disk(dev);

	if (nvme_disk_is_ns_head(disk))
		return disk->private_data;
	return nvme_get_ns_from_dev(dev)->head;
}

static ssize_t nvme_io_passthru_err_log_enabled_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nvme_ns_head *head = dev_to_ns_head(dev);

	return sysfs_emit(buf, head->passthru_err_log_enabled ? "on\n" : "off\n");
}

static ssize_t nvme_io_passthru_err_log_enabled_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct nvme_ns_head *head = dev_to_ns_head(dev);
	bool passthru_err_log_enabled;
	int err;

	err = kstrtobool(buf, &passthru_err_log_enabled);
	if (err)
		return -EINVAL;
	head->passthru_err_log_enabled = passthru_err_log_enabled;

	return count;
}

static struct device_attribute dev_attr_adm_passthru_err_log_enabled = \
	__ATTR(passthru_err_log_enabled, S_IRUGO | S_IWUSR, \
	nvme_adm_passthru_err_log_enabled_show, nvme_adm_passthru_err_log_enabled_store);

static struct device_attribute dev_attr_io_passthru_err_log_enabled = \
	__ATTR(passthru_err_log_enabled, S_IRUGO | S_IWUSR, \
	nvme_io_passthru_err_log_enabled_show, nvme_io_passthru_err_log_enabled_store);

static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct nvme_ns_head *head = dev_to_ns_head(dev);
	struct nvme_ns_ids *ids = &head->ids;
	struct nvme_subsystem *subsys = head->subsys;
	int serial_len = sizeof(subsys->serial);
	int model_len = sizeof(subsys->model);

	if (!uuid_is_null(&ids->uuid))
		return sysfs_emit(buf, "uuid.%pU\n", &ids->uuid);

	if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
		return sysfs_emit(buf, "eui.%16phN\n", ids->nguid);

	if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
		return sysfs_emit(buf, "eui.%8phN\n", ids->eui64);

	while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' ||
				  subsys->serial[serial_len - 1] == '\0'))
		serial_len--;
	while (model_len > 0 && (subsys->model[model_len - 1] == ' ' ||
				 subsys->model[model_len - 1] == '\0'))
		model_len--;

	return sysfs_emit(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id,
		serial_len, subsys->serial, model_len, subsys->model,
		head->ns_id);
}
static DEVICE_ATTR_RO(wwid);

static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	return sysfs_emit(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid);