LXR linux/drivers/pci/hotplug/rpadlpar

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Interface for Dynamic Logical Partitioning of I/O Slots on
   4 * RPA-compliant PPC64 platform.
   5 *
   6 * John Rose <johnrose@austin.ibm.com>
   7 * October 2003
   8 *
   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() which
  22 * stringifies the argument (yuck !)
  23 */
  24#define ADD_SLOT_ATTR_NAME    add_slot
  25#define REMOVE_SLOT_ATTR_NAME remove_slot
  26
  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 sprintf(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 sprintf(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