// SPDX-License-Identifier: GPL-2.0+
/*
 * Interface for Dynamic Logical Partitioning of I/O Slots on
 * RPA-compliant PPC64 platform.
 *
 * John Rose <johnrose@austin.ibm.com>
 * October 2003
 *
 * Copyright (C) 2003 IBM.
 */
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include "rpaphp.h"
#include "rpadlpar.h"
#include "../pci.h"

#define DLPAR_KOBJ_NAME       "control"

/* Those two have no quotes because they are passed to __ATTR() which
 * stringifies the argument (yuck !)
 */
#define ADD_SLOT_ATTR_NAME    add_slot
#define REMOVE_SLOT_ATTR_NAME remove_slot

static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
                              const char *buf, size_t nbytes)
{
        char drc_name[MAX_DRC_NAME_LEN];
        char *end;
        int rc;

        if (nbytes >= MAX_DRC_NAME_LEN)
                return 0;

        strscpy(drc_name, buf, nbytes + 1);

        end = strchr(drc_name, '\n');
        if (end)
                *end = '\0';

        rc = dlpar_add_slot(drc_name);
        if (rc)
                return rc;

        return nbytes;
}

static ssize_t add_slot_show(struct kobject *kobj,
                             struct kobj_attribute *attr, char *buf)
{
        return sysfs_emit(buf, "0\n");
}

static ssize_t remove_slot_store(struct kobject *kobj,
                                 struct kobj_attribute *attr,
                                 const char *buf, size_t nbytes)
{
        char drc_name[MAX_DRC_NAME_LEN];
        int rc;
        char *end;

        if (nbytes >= MAX_DRC_NAME_LEN)
                return 0;

        strscpy(drc_name, buf, nbytes + 1);

        end = strchr(drc_name, '\n');
        if (end)
                *end = '\0';

        rc = dlpar_remove_slot(drc_name);
        if (rc)
                return rc;

        return nbytes;
}

static ssize_t remove_slot_show(struct kobject *kobj,
                                struct kobj_attribute *attr, char *buf)
{
        return sysfs_emit(buf, "0\n");
}

static struct kobj_attribute add_slot_attr =
        __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);

static struct kobj_attribute remove_slot_attr =
        __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);

static struct attribute *default_attrs[] = {
        &add_slot_attr.attr,
        &remove_slot_attr.attr,
        NULL,
};

static const struct attribute_group dlpar_attr_group = {
        .attrs = default_attrs,
};

static struct kobject *dlpar_kobj;

int dlpar_sysfs_init(void)
{
        int error;

        dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
                                            &pci_slots_kset->kobj);
        if (!dlpar_kobj)
                return -EINVAL;

        error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
        if (error)
                kobject_put(dlpar_kobj);
        return error;
}

void dlpar_sysfs_exit(void)
{
        sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
        kobject_put(dlpar_kobj);
}