1/* 2 * Interface for Dynamic Logical Partitioning of I/O Slots on 3 * RPA-compliant PPC64 platform. 4 * 5 * John Rose <johnrose@austin.ibm.com> 6 * Linda Xie <lxie@us.ibm.com> 7 * 8 * October 2003 9 * 10 * Copyright (C) 2003 IBM. 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 */ 17 18#undef DEBUG 19 20#include <linux/init.h> 21#include <linux/pci.h> 22#include <linux/string.h> 23#include <linux/vmalloc.h> 24 25#include <asm/pci-bridge.h> 26#include <linux/mutex.h> 27#include <asm/rtas.h> 28#include <asm/vio.h> 29 30#include "../pci.h" 31#include "rpaphp.h" 32#include "rpadlpar.h" 33 34static DEFINE_MUTEX(rpadlpar_mutex); 35 36#define DLPAR_MODULE_NAME "rpadlpar_io" 37 38#define NODE_TYPE_VIO 1 39#define NODE_TYPE_SLOT 2 40#define NODE_TYPE_PHB 3 41 42static struct device_node *find_vio_slot_node(char *drc_name) 43{ 44 struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); 45 struct device_node *dn = NULL; 46 char *name; 47 int rc; 48 49 if (!parent) 50 return NULL; 51 52 while ((dn = of_get_next_child(parent, dn))) { 53 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL); 54 if ((rc == 0) && (!strcmp(drc_name, name))) 55 break; 56 } 57 58 return dn; 59} 60 61/* Find dlpar-capable pci node that contains the specified name and type */ 62static struct device_node *find_php_slot_pci_node(char *drc_name, 63 char *drc_type) 64{ 65 struct device_node *np = NULL; 66 char *name; 67 char *type; 68 int rc; 69 70 while ((np = of_find_node_by_name(np, "pci"))) { 71 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL); 72 if (rc == 0) 73 if (!strcmp(drc_name, name) && !strcmp(drc_type, type)) 74 break; 75 } 76 77 return np; 78} 79 80static struct device_node *find_dlpar_node(char *drc_name, int *node_type) 81{ 82 struct device_node *dn; 83 84 dn = find_php_slot_pci_node(drc_name, "SLOT"); 85 if (dn) { 86 *node_type = NODE_TYPE_SLOT; 87 return dn; 88 } 89 90 dn = find_php_slot_pci_node(drc_name, "PHB"); 91 if (dn) { 92 *node_type = NODE_TYPE_PHB; 93 return dn; 94 } 95 96 dn = find_vio_slot_node(drc_name); 97 if (dn) { 98 *node_type = NODE_TYPE_VIO; 99 return dn; 100 } 101 102 return NULL; 103} 104 105/** 106 * find_php_slot - return hotplug slot structure for device node 107 * @dn: target &device_node 108 * 109 * This routine will return the hotplug slot structure 110 * for a given device node. Note that built-in PCI slots 111 * may be dlpar-able, but not hot-pluggable, so this routine 112 * will return NULL for built-in PCI slots. 113 */ 114static struct slot *find_php_slot(struct device_node *dn) 115{ 116 struct list_head *tmp, *n; 117 struct slot *slot; 118 119 list_for_each_safe(tmp, n, &rpaphp_slot_head) { 120 slot = list_entry(tmp, struct slot, rpaphp_slot_list); 121 if (slot->dn == dn) 122 return slot; 123 } 124 125 return NULL; 126} 127 128static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, 129 struct device_node *dev_dn) 130{ 131 struct pci_dev *tmp = NULL; 132 struct device_node *child_dn; 133 134 list_for_each_entry(tmp, &parent->devices, bus_list) { 135 child_dn = pci_device_to_OF_node(tmp); 136 if (child_dn == dev_dn) 137 return tmp; 138 } 139 return NULL; 140} 141 142static void dlpar_pci_add_bus(struct device_node *dn) 143{ 144 struct pci_dn *pdn = PCI_DN(dn); 145 struct pci_controller *phb = pdn->phb; 146 struct pci_dev *dev = NULL; 147 148 eeh_add_device_tree_early(dn); 149 150 /* Add EADS device to PHB bus, adding new entry to bus->devices */ 151 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn); 152 if (!dev) { 153 printk(KERN_ERR "%s: failed to create pci dev for %s\n", 154 __func__, dn->full_name); 155 return; 156 } 157 158 /* Scan below the new bridge */ 159 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 160 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 161 of_scan_pci_bridge(dn, dev); 162 163 /* Map IO space for child bus, which may or may not succeed */ 164 pcibios_map_io_space(dev->subordinate); 165 166 /* Finish adding it : resource allocation, adding devices, etc... 167 * Note that we need to perform the finish pass on the -parent- 168 * bus of the EADS bridge so the bridge device itself gets 169 * properly added 170 */ 171 pcibios_finish_adding_to_bus(phb->bus); 172} 173 174static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) 175{ 176 struct pci_dev *dev; 177 struct pci_controller *phb; 178 179 if (pcibios_find_pci_bus(dn)) 180 return -EINVAL; 181 182 /* Add pci bus */ 183 dlpar_pci_add_bus(dn); 184 185 /* Confirm new bridge dev was created */ 186 phb = PCI_DN(dn)->phb; 187 dev = dlpar_find_new_dev(phb->bus, dn); 188 189 if (!dev) { 190 printk(KERN_ERR "%s: unable to add bus %s\n", __func__, 191 drc_name); 192 return -EIO; 193 } 194 195 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 196 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n", 197 __func__, dev->hdr_type, drc_name); 198 return -EIO; 199 } 200 201 /* Add hotplug slot */ 202 if (rpaphp_add_slot(dn)) { 203 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 204 __func__, drc_name); 205 return -EIO; 206 } 207 return 0; 208} 209 210static int dlpar_remove_phb(char *drc_name, struct device_node *dn) 211{ 212 struct slot *slot; 213 struct pci_dn *pdn; 214 int rc = 0; 215 216 if (!pcibios_find_pci_bus(dn)) 217 return -EINVAL; 218 219 /* If pci slot is hotplugable, use hotplug to remove it */ 220 slot = find_php_slot(dn); 221 if (slot && rpaphp_deregister_slot(slot)) { 222 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n", 223 __func__, drc_name); 224 return -EIO; 225 } 226 227 pdn = dn->data; 228 BUG_ON(!pdn || !pdn->phb); 229 rc = remove_phb_dynamic(pdn->phb); 230 if (rc < 0) 231 return rc; 232 233 pdn->phb = NULL; 234 235 return 0; 236} 237 238static int dlpar_add_phb(char *drc_name, struct device_node *dn) 239{ 240 struct pci_controller *phb; 241 242 if (PCI_DN(dn) && PCI_DN(dn)->phb) { 243 /* PHB already exists */ 244 return -EINVAL; 245 } 246 247 phb = init_phb_dynamic(dn); 248 if (!phb) 249 return -EIO; 250 251 if (rpaphp_add_slot(dn)) { 252 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 253 __func__, drc_name); 254 return -EIO; 255 } 256 return 0; 257} 258 259static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) 260{ 261 if (vio_find_node(dn)) 262 return -EINVAL; 263 264 if (!vio_register_device_node(dn)) { 265 printk(KERN_ERR 266 "%s: failed to register vio node %s\n", 267 __func__, drc_name); 268 return -EIO; 269 } 270 return 0; 271} 272 273/** 274 * dlpar_add_slot - DLPAR add an I/O Slot 275 * @drc_name: drc-name of newly added slot 276 * 277 * Make the hotplug module and the kernel aware of a newly added I/O Slot. 278 * Return Codes: 279 * 0 Success 280 * -ENODEV Not a valid drc_name 281 * -EINVAL Slot already added 282 * -ERESTARTSYS Signalled before obtaining lock 283 * -EIO Internal PCI Error 284 */ 285int dlpar_add_slot(char *drc_name) 286{ 287 struct device_node *dn = NULL; 288 int node_type; 289 int rc = -EIO; 290 291 if (mutex_lock_interruptible(&rpadlpar_mutex)) 292 return -ERESTARTSYS; 293 294 /* Find newly added node */ 295 dn = find_dlpar_node(drc_name, &node_type); 296 if (!dn) { 297 rc = -ENODEV; 298 goto exit; 299 } 300 301 switch (node_type) { 302 case NODE_TYPE_VIO: 303 rc = dlpar_add_vio_slot(drc_name, dn); 304 break; 305 case NODE_TYPE_SLOT: 306 rc = dlpar_add_pci_slot(drc_name, dn); 307 break; 308 case NODE_TYPE_PHB: 309 rc = dlpar_add_phb(drc_name, dn); 310 break; 311 } 312 313 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); 314exit: 315 mutex_unlock(&rpadlpar_mutex); 316 return rc; 317} 318 319/** 320 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot 321 * @drc_name: drc-name of newly added slot 322 * @dn: &device_node 323 * 324 * Remove the kernel and hotplug representations of an I/O Slot. 325 * Return Codes: 326 * 0 Success 327 * -EINVAL Vio dev doesn't exist 328 */ 329static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn) 330{ 331 struct vio_dev *vio_dev; 332 333 vio_dev = vio_find_node(dn); 334 if (!vio_dev) 335 return -EINVAL; 336 337 vio_unregister_device(vio_dev); 338 return 0; 339} 340 341/** 342 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot 343 * @drc_name: drc-name of newly added slot 344 * @dn: &device_node 345 * 346 * Remove the kernel and hotplug representations of a PCI I/O Slot. 347 * Return Codes: 348 * 0 Success 349 * -ENODEV Not a valid drc_name 350 * -EIO Internal PCI Error 351 */ 352int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) 353{ 354 struct pci_bus *bus; 355 struct slot *slot; 356 357 bus = pcibios_find_pci_bus(dn); 358 if (!bus) 359 return -EINVAL; 360 361 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n", 362 bus->self ? pci_name(bus->self) : "<!PHB!>"); 363 364 slot = find_php_slot(dn); 365 if (slot) { 366 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n", 367 pci_domain_nr(bus), bus->number); 368 369 if (rpaphp_deregister_slot(slot)) { 370 printk(KERN_ERR 371 "%s: unable to remove hotplug slot %s\n", 372 __func__, drc_name); 373 return -EIO; 374 } 375 } 376 377 /* Remove all devices below slot */ 378 pcibios_remove_pci_devices(bus); 379 380 /* Unmap PCI IO space */ 381 if (pcibios_unmap_io_space(bus)) { 382 printk(KERN_ERR "%s: failed to unmap bus range\n", 383 __func__); 384 return -ERANGE; 385 } 386 387 /* Remove the EADS bridge device itself */ 388 BUG_ON(!bus->self); 389 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self)); 390 eeh_remove_bus_device(bus->self); 391 pci_remove_bus_device(bus->self); 392 393 return 0; 394} 395 396/** 397 * dlpar_remove_slot - DLPAR remove an I/O Slot 398 * @drc_name: drc-name of newly added slot 399 * 400 * Remove the kernel and hotplug representations of an I/O Slot. 401 * Return Codes: 402 * 0 Success 403 * -ENODEV Not a valid drc_name 404 * -EINVAL Slot already removed 405 * -ERESTARTSYS Signalled before obtaining lock 406 * -EIO Internal Error 407 */ 408int dlpar_remove_slot(char *drc_name) 409{ 410 struct device_node *dn; 411 int node_type; 412 int rc = 0; 413 414 if (mutex_lock_interruptible(&rpadlpar_mutex)) 415 return -ERESTARTSYS; 416 417 dn = find_dlpar_node(drc_name, &node_type); 418 if (!dn) { 419 rc = -ENODEV; 420 goto exit; 421 } 422 423 switch (node_type) { 424 case NODE_TYPE_VIO: 425 rc = dlpar_remove_vio_slot(drc_name, dn); 426 break; 427 case NODE_TYPE_PHB: 428 rc = dlpar_remove_phb(drc_name, dn); 429 break; 430 case NODE_TYPE_SLOT: 431 rc = dlpar_remove_pci_slot(drc_name, dn); 432 break; 433 } 434 vm_unmap_aliases(); 435 436 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); 437exit: 438 mutex_unlock(&rpadlpar_mutex); 439 return rc; 440} 441 442static inline int is_dlpar_capable(void) 443{ 444 int rc = rtas_token("ibm,configure-connector"); 445 446 return (int) (rc != RTAS_UNKNOWN_SERVICE); 447} 448 449int __init rpadlpar_io_init(void) 450{ 451 int rc = 0; 452 453 if (!is_dlpar_capable()) { 454 printk(KERN_WARNING "%s: partition not DLPAR capable\n", 455 __func__); 456 return -EPERM; 457 } 458 459 rc = dlpar_sysfs_init(); 460 return rc; 461} 462 463void rpadlpar_io_exit(void) 464{ 465 dlpar_sysfs_exit(); 466 return; 467} 468 469module_init(rpadlpar_io_init); 470module_exit(rpadlpar_io_exit); 471MODULE_LICENSE("GPL"); 472