// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2025 IBM Corporation, Srish Srinivasan <ssrish@linux.ibm.com>
 *
 * This code exposes PLPKS config to user via sysfs
 */

#define pr_fmt(fmt) "plpks-sysfs: "fmt

#include <linux/init.h>
#include <linux/printk.h>
#include <linux/types.h>
#include <asm/machdep.h>
#include <asm/plpks.h>

/* config attributes for sysfs */
#define PLPKS_CONFIG_ATTR(name, fmt, func)                      \
        static ssize_t name##_show(struct kobject *kobj,        \
                                   struct kobj_attribute *attr, \
                                   char *buf)                   \
        {                                                       \
                return sysfs_emit(buf, fmt, func());            \
        }                                                       \
        static struct kobj_attribute attr_##name = __ATTR_RO(name)

PLPKS_CONFIG_ATTR(version, "%u\n", plpks_get_version);
PLPKS_CONFIG_ATTR(max_object_size, "%u\n", plpks_get_maxobjectsize);
PLPKS_CONFIG_ATTR(total_size, "%u\n", plpks_get_totalsize);
PLPKS_CONFIG_ATTR(used_space, "%u\n", plpks_get_usedspace);
PLPKS_CONFIG_ATTR(supported_policies, "%08x\n", plpks_get_supportedpolicies);
PLPKS_CONFIG_ATTR(signed_update_algorithms, "%016llx\n",
                  plpks_get_signedupdatealgorithms);
PLPKS_CONFIG_ATTR(wrapping_features, "%016llx\n", plpks_get_wrappingfeatures);

static const struct attribute *config_attrs[] = {
        &attr_version.attr,
        &attr_max_object_size.attr,
        &attr_total_size.attr,
        &attr_used_space.attr,
        &attr_supported_policies.attr,
        &attr_signed_update_algorithms.attr,
        &attr_wrapping_features.attr,
        NULL,
};

static struct kobject *plpks_kobj, *plpks_config_kobj;

int plpks_config_create_softlink(struct kobject *from)
{
        if (!plpks_config_kobj)
                return -EINVAL;
        return sysfs_create_link(from, plpks_config_kobj, "config");
}

static __init int plpks_sysfs_config(struct kobject *kobj)
{
        struct attribute_group config_group = {
                .name = NULL,
                .attrs = (struct attribute **)config_attrs,
        };

        return sysfs_create_group(kobj, &config_group);
}

static __init int plpks_sysfs_init(void)
{
        int rc;

        if (!plpks_is_available())
                return -ENODEV;

        plpks_kobj = kobject_create_and_add("plpks", firmware_kobj);
        if (!plpks_kobj) {
                pr_err("Failed to create plpks kobj\n");
                return -ENOMEM;
        }

        plpks_config_kobj = kobject_create_and_add("config", plpks_kobj);
        if (!plpks_config_kobj) {
                pr_err("Failed to create plpks config kobj\n");
                kobject_put(plpks_kobj);
                return -ENOMEM;
        }

        rc = plpks_sysfs_config(plpks_config_kobj);
        if (rc) {
                pr_err("Failed to create attribute group for plpks config\n");
                kobject_put(plpks_config_kobj);
                kobject_put(plpks_kobj);
                return rc;
        }

        return 0;
}

machine_subsys_initcall(pseries, plpks_sysfs_init);