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/*
* 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.
*
* 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 "pci_hotplug.h"
#include "rpadlpar.h"
#define DLPAR_KOBJ_NAME "control"
#define ADD_SLOT_ATTR_NAME "add_slot"
#define REMOVE_SLOT_ATTR_NAME "remove_slot"
#define MAX_DRC_NAME_LEN 64
/* Store return code of dlpar operation in attribute struct */
struct dlpar_io_attr {
int rc;
struct attribute attr;
ssize_t (*store)(struct dlpar_io_attr *dlpar_attr, const char *buf,
size_t nbytes);
};
/* Common show callback for all attrs, display the return code
* of the dlpar op */
static ssize_t
dlpar_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
{
struct dlpar_io_attr *dlpar_attr = container_of(attr,
struct dlpar_io_attr, attr);
return sprintf(buf, "%d\n", dlpar_attr->rc);
}
static ssize_t
dlpar_attr_store(struct kobject * kobj, struct attribute * attr,
const char *buf, size_t nbytes)
{
struct dlpar_io_attr *dlpar_attr = container_of(attr,
struct dlpar_io_attr, attr);
return dlpar_attr->store ?
dlpar_attr->store(dlpar_attr, buf, nbytes) : -EIO;
}
static struct sysfs_ops dlpar_attr_sysfs_ops = {
.show = dlpar_attr_show,
.store = dlpar_attr_store,
};
static ssize_t add_slot_store(struct dlpar_io_attr *dlpar_attr,
const char *buf, size_t nbytes)
{
char drc_name[MAX_DRC_NAME_LEN];
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';
dlpar_attr->rc = dlpar_add_slot(drc_name);
return nbytes;
}
static ssize_t remove_slot_store(struct dlpar_io_attr *dlpar_attr,
const char *buf, size_t nbytes)
{
char drc_name[MAX_DRC_NAME_LEN];
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';
dlpar_attr->rc = dlpar_remove_slot(drc_name);
return nbytes;
}
static struct dlpar_io_attr add_slot_attr = {
.rc = 0,
.attr = { .name = ADD_SLOT_ATTR_NAME, .mode = 0644, },
.store = add_slot_store,
};
static struct dlpar_io_attr remove_slot_attr = {
.rc = 0,
.attr = { .name = REMOVE_SLOT_ATTR_NAME, .mode = 0644},
.store = remove_slot_store,
};
static struct attribute *default_attrs[] = {
&add_slot_attr.attr,
&remove_slot_attr.attr,
NULL,
};
static void dlpar_io_release(struct kobject *kobj)
{
/* noop */
return;
}
struct kobj_type ktype_dlpar_io = {
.release = dlpar_io_release,
.sysfs_ops = &dlpar_attr_sysfs_ops,
.default_attrs = default_attrs,
};
struct kset dlpar_io_kset = {
.subsys = &pci_hotplug_slots_subsys,
.kobj = {.name = DLPAR_KOBJ_NAME, .ktype=&ktype_dlpar_io,},
.ktype = &ktype_dlpar_io,
};
int dlpar_sysfs_init(void)
{
if (kset_register(&dlpar_io_kset)) {
printk(KERN_ERR "rpadlpar_io: cannot register kset for %s\n",
dlpar_io_kset.kobj.name);
return -EINVAL;
}
return 0;
}
void dlpar_sysfs_exit(void)
{
kset_unregister(&dlpar_io_kset);
}
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