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 "pci_hotplug.h"
  18 #include "rpadlpar.h"
  19
  20 #define DLPAR_KOBJ_NAME       "control"
  21 #define ADD_SLOT_ATTR_NAME    "add_slot"
  22 #define REMOVE_SLOT_ATTR_NAME "remove_slot"
  23
  24 #define MAX_DRC_NAME_LEN 64
  25
  26 /* Store return code of dlpar operation in attribute struct */
  27 struct dlpar_io_attr {
  28         int rc;
  29         struct attribute attr;
  30         ssize_t (*store)(struct dlpar_io_attr *dlpar_attr, const char *buf,
  31                 size_t nbytes);
  32 };
  33
  34 /* Common show callback for all attrs, display the return code
  35  * of the dlpar op */
  36 static ssize_t
  37 dlpar_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
  38 {
  39         struct dlpar_io_attr *dlpar_attr = container_of(attr,
  40                                                 struct dlpar_io_attr, attr);
  41         return sprintf(buf, "%d\n", dlpar_attr->rc);
  42 }
  43
  44 static ssize_t
  45 dlpar_attr_store(struct kobject * kobj, struct attribute * attr,
  46                  const char *buf, size_t nbytes)
  47 {
  48         struct dlpar_io_attr *dlpar_attr = container_of(attr,
  49                                                 struct dlpar_io_attr, attr);
  50         return dlpar_attr->store ?
  51                 dlpar_attr->store(dlpar_attr, buf, nbytes) : -EIO;
  52 }
  53
  54 static struct sysfs_ops dlpar_attr_sysfs_ops = {
  55         .show = dlpar_attr_show,
  56         .store = dlpar_attr_store,
  57 };
  58
  59 static ssize_t add_slot_store(struct dlpar_io_attr *dlpar_attr,
  60                                 const char *buf, size_t nbytes)
  61 {
  62         char drc_name[MAX_DRC_NAME_LEN];
  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         dlpar_attr->rc = dlpar_add_slot(drc_name);
  76
  77         return nbytes;
  78 }
  79
  80 static ssize_t remove_slot_store(struct dlpar_io_attr *dlpar_attr,
  81                                 const char *buf, size_t nbytes)
  82 {
  83         char drc_name[MAX_DRC_NAME_LEN];
  84         char *end;
  85
  86         if (nbytes > MAX_DRC_NAME_LEN)
  87                 return 0;
  88
  89         memcpy(drc_name, buf, nbytes);
  90
  91         end = strchr(drc_name, '\n');
  92         if (!end)
  93                 end = &drc_name[nbytes];
  94         *end = '\0';
  95
  96         dlpar_attr->rc = dlpar_remove_slot(drc_name);
  97
  98         return nbytes;
  99 }
 100
 101 static struct dlpar_io_attr add_slot_attr = {
 102         .rc = 0,
 103         .attr = { .name = ADD_SLOT_ATTR_NAME, .mode = 0644, },
 104         .store = add_slot_store,
 105 };
 106
 107 static struct dlpar_io_attr remove_slot_attr = {
 108         .rc = 0,
 109         .attr = { .name = REMOVE_SLOT_ATTR_NAME, .mode = 0644},
 110         .store = remove_slot_store,
 111 };
 112
 113 static struct attribute *default_attrs[] = {
 114         &add_slot_attr.attr,
 115         &remove_slot_attr.attr,
 116         NULL,
 117 };
 118
 119 static void dlpar_io_release(struct kobject *kobj)
 120 {
 121         /* noop */
 122         return;
 123 }
 124
 125 struct kobj_type ktype_dlpar_io = {
 126         .release = dlpar_io_release,
 127         .sysfs_ops = &dlpar_attr_sysfs_ops,
 128         .default_attrs = default_attrs,
 129 };
 130
 131 struct kset dlpar_io_kset = {
 132         .subsys = &pci_hotplug_slots_subsys,
 133         .kobj = {.name = DLPAR_KOBJ_NAME, .ktype=&ktype_dlpar_io,},
 134         .ktype = &ktype_dlpar_io,
 135 };
 136
 137 int dlpar_sysfs_init(void)
 138 {
 139         if (kset_register(&dlpar_io_kset)) {
 140                 printk(KERN_ERR "rpadlpar_io: cannot register kset for %s\n",
 141                                 dlpar_io_kset.kobj.name);
 142                 return -EINVAL;
 143         }
 144
 145         return 0;
 146 }
 147
 148 void dlpar_sysfs_exit(void)
 149 {
 150         kset_unregister(&dlpar_io_kset);
 151 }