drivers/pci/hotplug/rpaphp_slot.c

   1 /*
   2  * RPA Virtual I/O device functions
   3  * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
   4  *
   5  * All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or (at
  10  * your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  15  * NON INFRINGEMENT.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  * Send feedback to <lxie@us.ibm.com>
  23  *
  24  */
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/kobject.h>
  28 #include <linux/sysfs.h>
  29 #include <linux/pci.h>
  30 #include <linux/string.h>
  31 #include <linux/slab.h>
  32
  33 #include <asm/rtas.h>
  34 #include "rpaphp.h"
  35
  36 static ssize_t address_read_file (struct hotplug_slot *php_slot, char *buf)
  37 {
  38         int retval;
  39         struct slot *slot = (struct slot *)php_slot->private;
  40         struct pci_bus *bus;
  41
  42         if (!slot)
  43                 return -ENOENT;
  44
  45         bus = slot->bus;
  46         if (!bus)
  47                 return -ENOENT;
  48
  49         if (bus->self)
  50                 retval = sprintf(buf, pci_name(bus->self));
  51         else
  52                 retval = sprintf(buf, "%04x:%02x:00.0",
  53                         pci_domain_nr(bus), bus->number);
  54
  55         return retval;
  56 }
  57
  58 static struct hotplug_slot_attribute php_attr_address = {
  59         .attr = {.name = "address", .mode = S_IFREG | S_IRUGO},
  60         .show = address_read_file,
  61 };
  62
  63 /* free up the memory used by a slot */
  64 static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
  65 {
  66         struct slot *slot = (struct slot *) hotplug_slot->private;
  67         dealloc_slot_struct(slot);
  68 }
  69
  70 void dealloc_slot_struct(struct slot *slot)
  71 {
  72         kfree(slot->hotplug_slot->info);
  73         kfree(slot->hotplug_slot->name);
  74         kfree(slot->hotplug_slot);
  75         kfree(slot);
  76 }
  77
  78 struct slot *alloc_slot_struct(struct device_node *dn,
  79                        int drc_index, char *drc_name, int power_domain)
  80 {
  81         struct slot *slot;
  82
  83         slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
  84         if (!slot)
  85                 goto error_nomem;
  86         slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
  87         if (!slot->hotplug_slot)
  88                 goto error_slot;
  89         slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
  90                                            GFP_KERNEL);
  91         if (!slot->hotplug_slot->info)
  92                 goto error_hpslot;
  93         slot->hotplug_slot->name = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
  94         if (!slot->hotplug_slot->name)
  95                 goto error_info;
  96         slot->name = slot->hotplug_slot->name;
  97         strcpy(slot->name, drc_name);
  98         slot->dn = dn;
  99         slot->index = drc_index;
 100         slot->power_domain = power_domain;
 101         slot->hotplug_slot->private = slot;
 102         slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
 103         slot->hotplug_slot->release = &rpaphp_release_slot;
 104
 105         return (slot);
 106
 107 error_info:
 108         kfree(slot->hotplug_slot->info);
 109 error_hpslot:
 110         kfree(slot->hotplug_slot);
 111 error_slot:
 112         kfree(slot);
 113 error_nomem:
 114         return NULL;
 115 }
 116
 117 static int is_registered(struct slot *slot)
 118 {
 119         struct slot *tmp_slot;
 120
 121         list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
 122                 if (!strcmp(tmp_slot->name, slot->name))
 123                         return 1;
 124         }
 125         return 0;
 126 }
 127
 128 int rpaphp_deregister_slot(struct slot *slot)
 129 {
 130         int retval = 0;
 131         struct hotplug_slot *php_slot = slot->hotplug_slot;
 132
 133          dbg("%s - Entry: deregistering slot=%s\n",
 134                 __FUNCTION__, slot->name);
 135
 136         list_del(&slot->rpaphp_slot_list);
 137
 138         /* remove "address" file */
 139         sysfs_remove_file(&php_slot->kobj, &php_attr_address.attr);
 140
 141         retval = pci_hp_deregister(php_slot);
 142         if (retval)
 143                 err("Problem unregistering a slot %s\n", slot->name);
 144
 145         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 146         return retval;
 147 }
 148 EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
 149
 150 int rpaphp_register_slot(struct slot *slot)
 151 {
 152         struct hotplug_slot *php_slot = slot->hotplug_slot;
 153         int retval;
 154
 155         dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
 156                 __FUNCTION__, slot->dn->full_name, slot->index, slot->name,
 157                 slot->power_domain, slot->type);
 158
 159         /* should not try to register the same slot twice */
 160         if (is_registered(slot)) {
 161                 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
 162                 return -EAGAIN;
 163         }
 164
 165         retval = pci_hp_register(php_slot);
 166         if (retval) {
 167                 err("pci_hp_register failed with error %d\n", retval);
 168                 return retval;
 169         }
 170
 171         /* create "address" file */
 172         retval = sysfs_create_file(&php_slot->kobj, &php_attr_address.attr);
 173         if (retval) {
 174                 err("sysfs_create_file failed with error %d\n", retval);
 175                 goto sysfs_fail;
 176         }
 177
 178         /* add slot to our internal list */
 179         list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
 180         info("Slot [%s] registered\n", slot->name);
 181         return 0;
 182
 183 sysfs_fail:
 184         pci_hp_deregister(php_slot);
 185         return retval;
 186 }
 187