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 } 186 187