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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Interface for Dynamic Logical Partitioning of I/O Slots on4 * RPA-compliant PPC64 platform.5 *6 * John Rose <johnrose@austin.ibm.com>7 * October 20038 *9 * Copyright (C) 2003 IBM.10 */11#include <linux/kobject.h>12#include <linux/string.h>13#include <linux/pci.h>14#include <linux/pci_hotplug.h>15#include "rpaphp.h"16#include "rpadlpar.h"17#include "../pci.h"18 19#define DLPAR_KOBJ_NAME "control"20 21/* Those two have no quotes because they are passed to __ATTR() which22 * stringifies the argument (yuck !)23 */24#define ADD_SLOT_ATTR_NAME add_slot25#define REMOVE_SLOT_ATTR_NAME remove_slot26 27static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,28 const char *buf, size_t nbytes)29{30 char drc_name[MAX_DRC_NAME_LEN];31 char *end;32 int rc;33 34 if (nbytes >= MAX_DRC_NAME_LEN)35 return 0;36 37 strscpy(drc_name, buf, nbytes + 1);38 39 end = strchr(drc_name, '\n');40 if (end)41 *end = '\0';42 43 rc = dlpar_add_slot(drc_name);44 if (rc)45 return rc;46 47 return nbytes;48}49 50static ssize_t add_slot_show(struct kobject *kobj,51 struct kobj_attribute *attr, char *buf)52{53 return sysfs_emit(buf, "0\n");54}55 56static ssize_t remove_slot_store(struct kobject *kobj,57 struct kobj_attribute *attr,58 const char *buf, size_t nbytes)59{60 char drc_name[MAX_DRC_NAME_LEN];61 int rc;62 char *end;63 64 if (nbytes >= MAX_DRC_NAME_LEN)65 return 0;66 67 strscpy(drc_name, buf, nbytes + 1);68 69 end = strchr(drc_name, '\n');70 if (end)71 *end = '\0';72 73 rc = dlpar_remove_slot(drc_name);74 if (rc)75 return rc;76 77 return nbytes;78}79 80static ssize_t remove_slot_show(struct kobject *kobj,81 struct kobj_attribute *attr, char *buf)82{83 return sysfs_emit(buf, "0\n");84}85 86static struct kobj_attribute add_slot_attr =87 __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);88 89static struct kobj_attribute remove_slot_attr =90 __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);91 92static struct attribute *default_attrs[] = {93 &add_slot_attr.attr,94 &remove_slot_attr.attr,95 NULL,96};97 98static const struct attribute_group dlpar_attr_group = {99 .attrs = default_attrs,100};101 102static struct kobject *dlpar_kobj;103 104int dlpar_sysfs_init(void)105{106 int error;107 108 dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,109 &pci_slots_kset->kobj);110 if (!dlpar_kobj)111 return -EINVAL;112 113 error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);114 if (error)115 kobject_put(dlpar_kobj);116 return error;117}118 119void dlpar_sysfs_exit(void)120{121 sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);122 kobject_put(dlpar_kobj);123}124