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 int retval; 121 int slotno; 122 123 dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n", 124 __func__, slot->dn->full_name, slot->index, slot->name, 125 slot->power_domain, slot->type); 126 127 /* should not try to register the same slot twice */ 128 if (is_registered(slot)) { 129 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name); 130 return -EAGAIN; 131 } 132 133 if (slot->dn->child) 134 slotno = PCI_SLOT(PCI_DN(slot->dn->child)->devfn); 135 else 136 slotno = -1; 137 retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name); 138 if (retval) { 139 err("pci_hp_register failed with error %d\n", retval); 140 return retval; 141 } 142 143 /* add slot to our internal list */ 144 list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head); 145 info("Slot [%s] registered\n", slot->name); 146 return 0; 147 } 148