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 location_read_file (struct hotplug_slot *php_slot, char *buf)
  37 {
  38         char *value;
  39         int retval = -ENOENT;
  40         struct slot *slot = (struct slot *)php_slot->private;
  41
  42         if (!slot)
  43                 return retval;
  44
  45         value = slot->location;
  46         retval = sprintf (buf, "%s\n", value);
  47         return retval;
  48 }
  49
  50 static struct hotplug_slot_attribute php_attr_location = {
  51         .attr = {.name = "phy_location", .mode = S_IFREG | S_IRUGO},
  52         .show = location_read_file,
  53 };
  54
  55 /* free up the memory used by a slot */
  56 static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
  57 {
  58         struct slot *slot = (struct slot *) hotplug_slot->private;
  59         dealloc_slot_struct(slot);
  60 }
  61
  62 void dealloc_slot_struct(struct slot *slot)
  63 {
  64         kfree(slot->hotplug_slot->info);
  65         kfree(slot->hotplug_slot->name);
  66         kfree(slot->hotplug_slot);
  67         kfree(slot->location);
  68         kfree(slot);
  69 }
  70
  71 struct slot *alloc_slot_struct(struct device_node *dn,
  72                        int drc_index, char *drc_name, int power_domain)
  73 {
  74         struct slot *slot;
  75
  76         slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
  77         if (!slot)
  78                 goto error_nomem;
  79         slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
  80         if (!slot->hotplug_slot)
  81                 goto error_slot;
  82         slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
  83                                            GFP_KERNEL);
  84         if (!slot->hotplug_slot->info)
  85                 goto error_hpslot;
  86         slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL);
  87         if (!slot->hotplug_slot->name)
  88                 goto error_info;
  89         slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
  90         if (!slot->location)
  91                 goto error_name;
  92         slot->name = slot->hotplug_slot->name;
  93         slot->dn = dn;
  94         slot->index = drc_index;
  95         strcpy(slot->location, drc_name);
  96         slot->power_domain = power_domain;
  97         slot->hotplug_slot->private = slot;
  98         slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
  99         slot->hotplug_slot->release = &rpaphp_release_slot;
 100
 101         return (slot);
 102
 103 error_name:
 104         kfree(slot->hotplug_slot->name);
 105 error_info:
 106         kfree(slot->hotplug_slot->info);
 107 error_hpslot:
 108         kfree(slot->hotplug_slot);
 109 error_slot:
 110         kfree(slot);
 111 error_nomem:
 112         return NULL;
 113 }
 114
 115 static int is_registered(struct slot *slot)
 116 {
 117         struct slot *tmp_slot;
 118
 119         list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
 120                 if (!strcmp(tmp_slot->name, slot->name))
 121                         return 1;
 122         }
 123         return 0;
 124 }
 125
 126 int rpaphp_deregister_slot(struct slot *slot)
 127 {
 128         int retval = 0;
 129         struct hotplug_slot *php_slot = slot->hotplug_slot;
 130
 131          dbg("%s - Entry: deregistering slot=%s\n",
 132                 __FUNCTION__, slot->name);
 133
 134         list_del(&slot->rpaphp_slot_list);
 135
 136         /* remove "phy_location" file */
 137         sysfs_remove_file(&php_slot->kobj, &php_attr_location.attr);
 138
 139         retval = pci_hp_deregister(php_slot);
 140         if (retval)
 141                 err("Problem unregistering a slot %s\n", slot->name);
 142
 143         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 144         return retval;
 145 }
 146 EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
 147
 148 int rpaphp_register_slot(struct slot *slot)
 149 {
 150         struct hotplug_slot *php_slot = slot->hotplug_slot;
 151         int retval;
 152
 153         dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
 154                 __FUNCTION__, slot->dn->full_name, slot->index, slot->name,
 155                 slot->power_domain, slot->type);
 156
 157         /* should not try to register the same slot twice */
 158         if (is_registered(slot)) {
 159                 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
 160                 return -EAGAIN;
 161         }
 162
 163         retval = pci_hp_register(php_slot);
 164         if (retval) {
 165                 err("pci_hp_register failed with error %d\n", retval);
 166                 return retval;
 167         }
 168
 169         /* create "phy_location" file */
 170         retval = sysfs_create_file(&php_slot->kobj, &php_attr_location.attr);
 171         if (retval) {
 172                 err("sysfs_create_file failed with error %d\n", retval);
 173                 goto sysfs_fail;
 174         }
 175
 176         /* add slot to our internal list */
 177         list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
 178         info("Slot [%s](PCI location=%s) registered\n", slot->name,
 179                         slot->location);
 180         return 0;
 181
 182 sysfs_fail:
 183         pci_hp_deregister(php_slot);
 184         return retval;
 185 }
 186