rpadlpar_sysfs.c

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/*
 * Interface for Dynamic Logical Partitioning of I/O Slots on
 * RPA-compliant PPC64 platform.
 *
 * John Rose <[email protected]>
 * October 2003
 *
 * Copyright (C) 2003 IBM.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.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

#define MAX_DRC_NAME_LEN 64

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;

    memcpy(drc_name, buf, nbytes);

    end = strchr(drc_name, '\n');
    if (!end)
        end = &drc_name[nbytes];
    *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 sprintf(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;

    memcpy(drc_name, buf, nbytes);

    end = strchr(drc_name, '\n');
    if (!end)
        end = &drc_name[nbytes];
    *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 sprintf(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 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);
}