arch/x86/platform/uv/uv_sysfs.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * This file supports the /sys/firmware/sgi_uv interfaces for SGI UV.
 *
 *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
 *  Copyright (c) Russ Anderson
 */

#include <linux/device.h>
#include <asm/uv/bios.h>
#include <asm/uv/uv.h>

struct kobject *sgi_uv_kobj;

static ssize_t partition_id_show(struct kobject *kobj,
			struct kobj_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%ld\n", sn_partition_id);
}

static ssize_t coherence_id_show(struct kobject *kobj,
			struct kobj_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%ld\n", sn_coherency_id);
}

static struct kobj_attribute partition_id_attr =
	__ATTR(partition_id, S_IRUGO, partition_id_show, NULL);

static struct kobj_attribute coherence_id_attr =
	__ATTR(coherence_id, S_IRUGO, coherence_id_show, NULL);


static int __init sgi_uv_sysfs_init(void)
{
	unsigned long ret;

	if (!is_uv_system())
		return -ENODEV;

	if (!sgi_uv_kobj)
		sgi_uv_kobj = kobject_create_and_add("sgi_uv", firmware_kobj);
	if (!sgi_uv_kobj) {
		printk(KERN_WARNING "kobject_create_and_add sgi_uv failed\n");
		return -EINVAL;
	}

	ret = sysfs_create_file(sgi_uv_kobj, &partition_id_attr.attr);
	if (ret) {
		printk(KERN_WARNING "sysfs_create_file partition_id failed\n");
		return ret;
	}

	ret = sysfs_create_file(sgi_uv_kobj, &coherence_id_attr.attr);
	if (ret) {
		printk(KERN_WARNING "sysfs_create_file coherence_id failed\n");
		return ret;
	}

	return 0;
}

device_initcall(sgi_uv_sysfs_init);