LXR linux/drivers/pci/hotplug/rpadlpar

   1/*
   2 * Interface for Dynamic Logical Partitioning of I/O Slots on
   3 * RPA-compliant PPC64 platform.
   4 *
   5 * John Rose <johnrose@austin.ibm.com>
   6 * October 2003
   7 *
   8 * Copyright (C) 2003 IBM.
   9 *
  10 *      This program is free software; you can redistribute it and/or
  11 *      modify it under the terms of the GNU General Public License
  12 *      as published by the Free Software Foundation; either version
  13 *      2 of the License, or (at your option) any later version.
  14 */
  15#include <linux/kobject.h>
  16#include <linux/string.h>
  17#include <linux/pci.h>
  18#include <linux/pci_hotplug.h>
  19#include "rpadlpar.h"
  20#include "../pci.h"
  21
  22#define DLPAR_KOBJ_NAME       "control"
  23
  24/* Those two have no quotes because they are passed to __ATTR() which
  25 * stringifies the argument (yuck !)
  26 */
  27#define ADD_SLOT_ATTR_NAME    add_slot
  28#define REMOVE_SLOT_ATTR_NAME remove_slot
  29
  30#define MAX_DRC_NAME_LEN 64
  31
  32static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
  33                              const char *buf, size_t nbytes)
  34{
  35        char drc_name[MAX_DRC_NAME_LEN];
  36        char *end;
  37        int rc;
  38
  39        if (nbytes >= MAX_DRC_NAME_LEN)
  40                return 0;
  41
  42        memcpy(drc_name, buf, nbytes);
  43
  44        end = strchr(drc_name, '\n');
  45        if (!end)
  46                end = &drc_name[nbytes];
  47        *end = '\0';
  48
  49        rc = dlpar_add_slot(drc_name);
  50        if (rc)
  51                return rc;
  52
  53        return nbytes;
  54}
  55
  56static ssize_t add_slot_show(struct kobject *kobj,
  57                             struct kobj_attribute *attr, char *buf)
  58{
  59        return sprintf(buf, "0\n");
  60}
  61
  62static ssize_t remove_slot_store(struct kobject *kobj,
  63                                 struct kobj_attribute *attr,
  64                                 const char *buf, size_t nbytes)
  65{
  66        char drc_name[MAX_DRC_NAME_LEN];
  67        int rc;
  68        char *end;
  69
  70        if (nbytes >= MAX_DRC_NAME_LEN)
  71                return 0;
  72
  73        memcpy(drc_name, buf, nbytes);
  74
  75        end = strchr(drc_name, '\n');
  76        if (!end)
  77                end = &drc_name[nbytes];
  78        *end = '\0';
  79
  80        rc = dlpar_remove_slot(drc_name);
  81        if (rc)
  82                return rc;
  83
  84        return nbytes;
  85}
  86
  87static ssize_t remove_slot_show(struct kobject *kobj,
  88                                struct kobj_attribute *attr, char *buf)
  89{
  90        return sprintf(buf, "0\n");
  91}
  92
  93static struct kobj_attribute add_slot_attr =
  94        __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
  95
  96static struct kobj_attribute remove_slot_attr =
  97        __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
  98
  99static struct attribute *default_attrs[] = {
 100        &add_slot_attr.attr,
 101        &remove_slot_attr.attr,
 102        NULL,
 103};
 104
 105static struct attribute_group dlpar_attr_group = {
 106        .attrs = default_attrs,
 107};
 108
 109static struct kobject *dlpar_kobj;
 110
 111int dlpar_sysfs_init(void)
 112{
 113        int error;
 114
 115        dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
 116                                            &pci_slots_kset->kobj);
 117        if (!dlpar_kobj)
 118                return -EINVAL;
 119
 120        error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
 121        if (error)
 122                kobject_put(dlpar_kobj);
 123        return error;
 124}
 125
 126void dlpar_sysfs_exit(void)
 127{
 128        sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
 129        kobject_put(dlpar_kobj);
 130}
 131