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        memcpy(drc_name, buf, nbytes);
  38
  39        end = strchr(drc_name, '\n');
  40        if (!end)
  41                end = &drc_name[nbytes];
  42        *end = '\0';
  43
  44        rc = dlpar_add_slot(drc_name);
  45        if (rc)
  46                return rc;
  47
  48        return nbytes;
  49}
  50
  51static ssize_t add_slot_show(struct kobject *kobj,
  52                             struct kobj_attribute *attr, char *buf)
  53{
  54        return sprintf(buf, "0\n");
  55}
  56
  57static ssize_t remove_slot_store(struct kobject *kobj,
  58                                 struct kobj_attribute *attr,
  59                                 const char *buf, size_t nbytes)
  60{
  61        char drc_name[MAX_DRC_NAME_LEN];
  62        int rc;
  63        char *end;
  64
  65        if (nbytes >= MAX_DRC_NAME_LEN)
  66                return 0;
  67
  68        memcpy(drc_name, buf, nbytes);
  69
  70        end = strchr(drc_name, '\n');
  71        if (!end)
  72                end = &drc_name[nbytes];
  73        *end = '\0';
  74
  75        rc = dlpar_remove_slot(drc_name);
  76        if (rc)
  77                return rc;
  78
  79        return nbytes;
  80}
  81
  82static ssize_t remove_slot_show(struct kobject *kobj,
  83                                struct kobj_attribute *attr, char *buf)
  84{
  85        return sprintf(buf, "0\n");
  86}
  87
  88static struct kobj_attribute add_slot_attr =
  89        __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
  90
  91static struct kobj_attribute remove_slot_attr =
  92        __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
  93
  94static struct attribute *default_attrs[] = {
  95        &add_slot_attr.attr,
  96        &remove_slot_attr.attr,
  97        NULL,
  98};
  99
 100static const struct attribute_group dlpar_attr_group = {
 101        .attrs = default_attrs,
 102};
 103
 104static struct kobject *dlpar_kobj;
 105
 106int dlpar_sysfs_init(void)
 107{
 108        int error;
 109
 110        dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
 111                                            &pci_slots_kset->kobj);
 112        if (!dlpar_kobj)
 113                return -EINVAL;
 114
 115        error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
 116        if (error)
 117                kobject_put(dlpar_kobj);
 118        return error;
 119}
 120
 121void dlpar_sysfs_exit(void)
 122{
 123        sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
 124        kobject_put(dlpar_kobj);
 125}
 126