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 address_read_file (struct hotplug_slot *php_slot, char *buf) 37 { 38 int retval; 39 struct slot *slot = (struct slot *)php_slot->private; 40 struct pci_bus *bus; 41 42 if (!slot) 43 return -ENOENT; 44 45 bus = slot->bus; 46 if (!bus) 47 return -ENOENT; 48 49 if (bus->self) 50 retval = sprintf(buf, pci_name(bus->self)); 51 else 52 retval = sprintf(buf, "%04x:%02x:00.0", 53 pci_domain_nr(bus), bus->number); 54 55 return retval; 56 } 57 58 static struct hotplug_slot_attribute php_attr_address = { 59 .attr = {.name = "address", .mode = S_IFREG | S_IRUGO}, 60 .show = address_read_file, 61 }; 62 63 /* free up the memory used by a slot */ 64 static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot) 65 { 66 struct slot *slot = (struct slot *) hotplug_slot->private; 67 dealloc_slot_struct(slot); 68 } 69 70 void dealloc_slot_struct(struct slot *slot) 71 { 72 kfree(slot->hotplug_slot->info); 73 kfree(slot->hotplug_slot->name); 74 kfree(slot->hotplug_slot); 75 kfree(slot); 76 } 77 78 struct slot *alloc_slot_struct(struct device_node *dn, 79 int drc_index, char *drc_name, int power_domain) 80 { 81 struct slot *slot; 82 83 slot = kzalloc(sizeof(struct slot), GFP_KERNEL); 84 if (!slot) 85 goto error_nomem; 86 slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL); 87 if (!slot->hotplug_slot) 88 goto error_slot; 89 slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info), 90 GFP_KERNEL); 91 if (!slot->hotplug_slot->info) 92 goto error_hpslot; 93 slot->hotplug_slot->name = kmalloc(strlen(drc_name) + 1, GFP_KERNEL); 94 if (!slot->hotplug_slot->name) 95 goto error_info; 96 slot->name = slot->hotplug_slot->name; 97 strcpy(slot->name, drc_name); 98 slot->dn = dn; 99 slot->index = drc_index; 100 slot->power_domain = power_domain; 101 slot->hotplug_slot->private = slot; 102 slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops; 103 slot->hotplug_slot->release = &rpaphp_release_slot; 104 105 return (slot); 106 107 error_info: 108 kfree(slot->hotplug_slot->info); 109 error_hpslot: 110 kfree(slot->hotplug_slot); 111 error_slot: 112 kfree(slot); 113 error_nomem: 114 return NULL; 115 } 116 117 static int is_registered(struct slot *slot) 118 { 119 struct slot *tmp_slot; 120 121 list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) { 122 if (!strcmp(tmp_slot->name, slot->name)) 123 return 1; 124 } 125 return 0; 126 } 127 128 int rpaphp_deregister_slot(struct slot *slot) 129 { 130 int retval = 0; 131 struct hotplug_slot *php_slot = slot->hotplug_slot; 132 133 dbg("%s - Entry: deregistering slot=%s\n", 134 __FUNCTION__, slot->name); 135 136 list_del(&slot->rpaphp_slot_list); 137 138 /* remove "address" file */ 139 sysfs_remove_file(&php_slot->kobj, &php_attr_address.attr); 140 141 retval = pci_hp_deregister(php_slot); 142 if (retval) 143 err("Problem unregistering a slot %s\n", slot->name); 144 145 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); 146 return retval; 147 } 148 EXPORT_SYMBOL_GPL(rpaphp_deregister_slot); 149 150 int rpaphp_register_slot(struct slot *slot) 151 { 152 struct hotplug_slot *php_slot = slot->hotplug_slot; 153 int retval; 154 155 dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n", 156 __FUNCTION__, slot->dn->full_name, slot->index, slot->name, 157 slot->power_domain, slot->type); 158 159 /* should not try to register the same slot twice */ 160 if (is_registered(slot)) { 161 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name); 162 return -EAGAIN; 163 } 164 165 retval = pci_hp_register(php_slot); 166 if (retval) { 167 err("pci_hp_register failed with error %d\n", retval); 168 return retval; 169 } 170 171 /* create "address" file */ 172 retval = sysfs_create_file(&php_slot->kobj, &php_attr_address.attr); 173 if (retval) { 174 err("sysfs_create_file failed with error %d\n", retval); 175 goto sysfs_fail; 176 } 177 178 /* add slot to our internal list */ 179 list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head); 180 info("Slot [%s] registered\n", slot->name); 181 return 0; 182 183 sysfs_fail: 184 pci_hp_deregister(php_slot); 185 return retval; 186 } 187 188