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 } 155 156