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 60 dealloc_slot_struct(slot); 61 } 62 63 void dealloc_slot_struct(struct slot *slot) 64 { 65 kfree(slot->hotplug_slot->info); 66 kfree(slot->hotplug_slot->name); 67 kfree(slot->hotplug_slot); 68 kfree(slot); 69 return; 70 } 71 72 struct slot *alloc_slot_struct(struct device_node *dn, int drc_index, char *drc_name, 73 int power_domain) 74 { 75 struct slot *slot; 76 77 slot = kzalloc(sizeof(struct slot), GFP_KERNEL); 78 if (!slot) 79 goto error_nomem; 80 slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL); 81 if (!slot->hotplug_slot) 82 goto error_slot; 83 slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info), 84 GFP_KERNEL); 85 if (!slot->hotplug_slot->info) 86 goto error_hpslot; 87 slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL); 88 if (!slot->hotplug_slot->name) 89 goto error_info; 90 slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL); 91 if (!slot->location) 92 goto error_name; 93 slot->name = slot->hotplug_slot->name; 94 slot->dn = dn; 95 slot->index = drc_index; 96 strcpy(slot->location, drc_name); 97 slot->power_domain = power_domain; 98 slot->hotplug_slot->private = slot; 99 slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops; 100 slot->hotplug_slot->release = &rpaphp_release_slot; 101 102 return (slot); 103 104 error_name: 105 kfree(slot->hotplug_slot->name); 106 error_info: 107 kfree(slot->hotplug_slot->info); 108 error_hpslot: 109 kfree(slot->hotplug_slot); 110 error_slot: 111 kfree(slot); 112 error_nomem: 113 return NULL; 114 } 115 116 static int is_registered(struct slot *slot) 117 { 118 struct slot *tmp_slot; 119 120 list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) { 121 if (!strcmp(tmp_slot->name, slot->name)) 122 return 1; 123 } 124 return 0; 125 } 126 127 int rpaphp_deregister_slot(struct slot *slot) 128 { 129 int retval = 0; 130 struct hotplug_slot *php_slot = slot->hotplug_slot; 131 132 dbg("%s - Entry: deregistering slot=%s\n", 133 __FUNCTION__, slot->name); 134 135 list_del(&slot->rpaphp_slot_list); 136 137 /* remove "phy_location" file */ 138 sysfs_remove_file(&php_slot->kobj, &php_attr_location.attr); 139 140 retval = pci_hp_deregister(php_slot); 141 if (retval) 142 err("Problem unregistering a slot %s\n", slot->name); 143 else 144 num_slots--; 145 146 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); 147 return retval; 148 } 149 EXPORT_SYMBOL_GPL(rpaphp_deregister_slot); 150 151 int rpaphp_register_slot(struct slot *slot) 152 { 153 struct hotplug_slot *php_slot = slot->hotplug_slot; 154 int retval; 155 156 dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n", 157 __FUNCTION__, slot->dn->full_name, slot->index, slot->name, 158 slot->power_domain, slot->type); 159 160 /* should not try to register the same slot twice */ 161 if (is_registered(slot)) { 162 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name); 163 retval = -EAGAIN; 164 goto register_fail; 165 } 166 167 retval = pci_hp_register(php_slot); 168 if (retval) { 169 err("pci_hp_register failed with error %d\n", retval); 170 goto register_fail; 171 } 172 173 /* create "phy_location" file */ 174 retval = sysfs_create_file(&php_slot->kobj, &php_attr_location.attr); 175 if (retval) { 176 err("sysfs_create_file failed with error %d\n", retval); 177 goto sysfs_fail; 178 } 179 180 /* add slot to our internal list */ 181 list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head); 182 info("Slot [%s](PCI location=%s) registered\n", slot->name, 183 slot->location); 184 num_slots++; 185 return 0; 186 187 sysfs_fail: 188 pci_hp_deregister(php_slot); 189 register_fail: 190 rpaphp_release_slot(php_slot); 191 return retval; 192 } 193 194 int rpaphp_get_power_status(struct slot *slot, u8 * value) 195 { 196 int rc = 0, level; 197 198 rc = rtas_get_power_level(slot->power_domain, &level); 199 if (rc < 0) { 200 err("failed to get power-level for slot(%s), rc=0x%x\n", 201 slot->location, rc); 202 return rc; 203 } 204 205 dbg("%s the power level of slot %s(pwd-domain:0x%x) is %d\n", 206 __FUNCTION__, slot->name, slot->power_domain, level); 207 *value = level; 208 209 return rc; 210 } 211 212 int rpaphp_set_attention_status(struct slot *slot, u8 status) 213 { 214 int rc; 215 216 /* status: LED_OFF or LED_ON */ 217 rc = rtas_set_indicator(DR_INDICATOR, slot->index, status); 218 if (rc < 0) 219 err("slot(name=%s location=%s index=0x%x) set attention-status(%d) failed! rc=0x%x\n", 220 slot->name, slot->location, slot->index, status, rc); 221 222 return rc; 223 } 224