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 /* free up the memory used by a slot */
  37 static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
  38 {
  39         struct slot *slot = (struct slot *) hotplug_slot->private;
  40         dealloc_slot_struct(slot);
  41 }
  42
  43 void dealloc_slot_struct(struct slot *slot)
  44 {
  45         kfree(slot->hotplug_slot->info);
  46         kfree(slot->hotplug_slot->name);
  47         kfree(slot->hotplug_slot);
  48         kfree(slot);
  49 }
  50
  51 struct slot *alloc_slot_struct(struct device_node *dn,
  52                        int drc_index, char *drc_name, int power_domain)
  53 {
  54         struct slot *slot;
  55
  56         slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
  57         if (!slot)
  58                 goto error_nomem;
  59         slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
  60         if (!slot->hotplug_slot)
  61                 goto error_slot;
  62         slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
  63                                            GFP_KERNEL);
  64         if (!slot->hotplug_slot->info)
  65                 goto error_hpslot;
  66         slot->hotplug_slot->name = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
  67         if (!slot->hotplug_slot->name)
  68                 goto error_info;
  69         slot->name = slot->hotplug_slot->name;
  70         strcpy(slot->name, drc_name);
  71         slot->dn = dn;
  72         slot->index = drc_index;
  73         slot->power_domain = power_domain;
  74         slot->hotplug_slot->private = slot;
  75         slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
  76         slot->hotplug_slot->release = &rpaphp_release_slot;
  77
  78         return (slot);
  79
  80 error_info:
  81         kfree(slot->hotplug_slot->info);
  82 error_hpslot:
  83         kfree(slot->hotplug_slot);
  84 error_slot:
  85         kfree(slot);
  86 error_nomem:
  87         return NULL;
  88 }
  89
  90 static int is_registered(struct slot *slot)
  91 {
  92         struct slot *tmp_slot;
  93
  94         list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
  95                 if (!strcmp(tmp_slot->name, slot->name))
  96                         return 1;
  97         }
  98         return 0;
  99 }
 100
 101 int rpaphp_deregister_slot(struct slot *slot)
 102 {
 103         int retval = 0;
 104         struct hotplug_slot *php_slot = slot->hotplug_slot;
 105
 106          dbg("%s - Entry: deregistering slot=%s\n",
 107                 __func__, slot->name);
 108
 109         list_del(&slot->rpaphp_slot_list);
 110
 111         retval = pci_hp_deregister(php_slot);
 112         if (retval)
 113                 err("Problem unregistering a slot %s\n", slot->name);
 114
 115         dbg("%s - Exit: rc[%d]\n", __func__, retval);
 116         return retval;
 117 }
 118 EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
 119
 120 int rpaphp_register_slot(struct slot *slot)
 121 {
 122         struct hotplug_slot *php_slot = slot->hotplug_slot;
 123         int retval;
 124         int slotno;
 125
 126         dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
 127                 __func__, slot->dn->full_name, slot->index, slot->name,
 128                 slot->power_domain, slot->type);
 129
 130         /* should not try to register the same slot twice */
 131         if (is_registered(slot)) {
 132                 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
 133                 return -EAGAIN;
 134         }
 135
 136         if (slot->dn->child)
 137                 slotno = PCI_SLOT(PCI_DN(slot->dn->child)->devfn);
 138         else
 139                 slotno = -1;
 140         retval = pci_hp_register(php_slot, slot->bus, slotno);
 141         if (retval) {
 142                 err("pci_hp_register failed with error %d\n", retval);
 143                 return retval;
 144         }
 145
 146         /* add slot to our internal list */
 147         list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
 148         info("Slot [%s] registered\n", slot->name);
 149         return 0;
 150
 151 sysfs_fail:
 152         pci_hp_deregister(php_slot);
 153         return retval;
 154 }
 155