drivers/pci/hotplug/rpadlpar_sysfs.c

   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
  32 static 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
  56 static ssize_t add_slot_show(struct kobject *kobj,
  57                              struct kobj_attribute *attr, char *buf)
  58 {
  59         return sprintf(buf, "0\n");
  60 }
  61
  62 static 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
  87 static ssize_t remove_slot_show(struct kobject *kobj,
  88                                 struct kobj_attribute *attr, char *buf)
  89 {
  90         return sprintf(buf, "0\n");
  91 }
  92
  93 static struct kobj_attribute add_slot_attr =
  94         __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
  95
  96 static struct kobj_attribute remove_slot_attr =
  97         __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
  98
  99 static struct attribute *default_attrs[] = {
 100         &add_slot_attr.attr,
 101         &remove_slot_attr.attr,
 102         NULL,
 103 };
 104
 105 static const struct attribute_group dlpar_attr_group = {
 106         .attrs = default_attrs,
 107 };
 108
 109 static struct kobject *dlpar_kobj;
 110
 111 int 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
 126 void dlpar_sysfs_exit(void)
 127 {
 128         sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
 129         kobject_put(dlpar_kobj);
 130 }