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/sysfs.h>
  28 #include <linux/pci.h>
  29 #include <linux/string.h>
  30 #include <linux/slab.h>
  31
  32 #include <asm/rtas.h>
  33 #include "rpaphp.h"
  34
  35 /* free up the memory used by a slot */
  36 static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
  37 {
  38         struct slot *slot = (struct slot *) hotplug_slot->private;
  39         dealloc_slot_struct(slot);
  40 }
  41
  42 void dealloc_slot_struct(struct slot *slot)
  43 {
  44         kfree(slot->hotplug_slot->info);
  45         kfree(slot->name);
  46         kfree(slot->hotplug_slot);
  47         kfree(slot);
  48 }
  49
  50 struct slot *alloc_slot_struct(struct device_node *dn,
  51                 int drc_index, char *drc_name, int power_domain)
  52 {
  53         struct slot *slot;
  54
  55         slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
  56         if (!slot)
  57                 goto error_nomem;
  58         slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
  59         if (!slot->hotplug_slot)
  60                 goto error_slot;
  61         slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
  62                                            GFP_KERNEL);
  63         if (!slot->hotplug_slot->info)
  64                 goto error_hpslot;
  65         slot->name = kstrdup(drc_name, GFP_KERNEL);
  66         if (!slot->name)
  67                 goto error_info;
  68         slot->dn = dn;
  69         slot->index = drc_index;
  70         slot->power_domain = power_domain;
  71         slot->hotplug_slot->private = slot;
  72         slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
  73         slot->hotplug_slot->release = &rpaphp_release_slot;
  74
  75         return (slot);
  76
  77 error_info:
  78         kfree(slot->hotplug_slot->info);
  79 error_hpslot:
  80         kfree(slot->hotplug_slot);
  81 error_slot:
  82         kfree(slot);
  83 error_nomem:
  84         return NULL;
  85 }
  86
  87 static int is_registered(struct slot *slot)
  88 {
  89         struct slot *tmp_slot;
  90
  91         list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
  92                 if (!strcmp(tmp_slot->name, slot->name))
  93                         return 1;
  94         }
  95         return 0;
  96 }
  97
  98 int rpaphp_deregister_slot(struct slot *slot)
  99 {
 100         int retval = 0;
 101         struct hotplug_slot *php_slot = slot->hotplug_slot;
 102
 103          dbg("%s - Entry: deregistering slot=%s\n",
 104                 __func__, slot->name);
 105
 106         list_del(&slot->rpaphp_slot_list);
 107
 108         retval = pci_hp_deregister(php_slot);
 109         if (retval)
 110                 err("Problem unregistering a slot %s\n", slot->name);
 111
 112         dbg("%s - Exit: rc[%d]\n", __func__, retval);
 113         return retval;
 114 }
 115 EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
 116
 117 int rpaphp_register_slot(struct slot *slot)
 118 {
 119         struct hotplug_slot *php_slot = slot->hotplug_slot;
 120         struct device_node *child;
 121         u32 my_index;
 122         int retval;
 123         int slotno = -1;
 124
 125         dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
 126                 __func__, slot->dn->full_name, slot->index, slot->name,
 127                 slot->power_domain, slot->type);
 128
 129         /* should not try to register the same slot twice */
 130         if (is_registered(slot)) {
 131                 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
 132                 return -EAGAIN;
 133         }
 134
 135         for_each_child_of_node(slot->dn, child) {
 136                 retval = of_property_read_u32(child, "ibm,my-drc-index", &my_index);
 137                 if (my_index == slot->index) {
 138                         slotno = PCI_SLOT(PCI_DN(child)->devfn);
 139                         of_node_put(child);
 140                         break;
 141                 }
 142         }
 143
 144         retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
 145         if (retval) {
 146                 err("pci_hp_register failed with error %d\n", retval);
 147                 return retval;
 148         }
 149
 150         /* add slot to our internal list */
 151         list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
 152         info("Slot [%s] registered\n", slot->name);
 153         return 0;
 154 }