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 #include <linux/init.h> 18 #include <linux/pci.h> 19 #include <linux/string.h> 20 21 #include <asm/pci-bridge.h> 22 #include <linux/mutex.h> 23 #include <asm/rtas.h> 24 #include <asm/vio.h> 25 26 #include "../pci.h" 27 #include "rpaphp.h" 28 #include "rpadlpar.h" 29 30 static DEFINE_MUTEX(rpadlpar_mutex); 31 32 #define DLPAR_MODULE_NAME "rpadlpar_io" 33 34 #define NODE_TYPE_VIO 1 35 #define NODE_TYPE_SLOT 2 36 #define NODE_TYPE_PHB 3 37 38 static struct device_node *find_vio_slot_node(char *drc_name) 39 { 40 struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); 41 struct device_node *dn = NULL; 42 char *name; 43 int rc; 44 45 if (!parent) 46 return NULL; 47 48 while ((dn = of_get_next_child(parent, dn))) { 49 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL); 50 if ((rc == 0) && (!strcmp(drc_name, name))) 51 break; 52 } 53 54 return dn; 55 } 56 57 /* Find dlpar-capable pci node that contains the specified name and type */ 58 static struct device_node *find_php_slot_pci_node(char *drc_name, 59 char *drc_type) 60 { 61 struct device_node *np = NULL; 62 char *name; 63 char *type; 64 int rc; 65 66 while ((np = of_find_node_by_name(np, "pci"))) { 67 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL); 68 if (rc == 0) 69 if (!strcmp(drc_name, name) && !strcmp(drc_type, type)) 70 break; 71 } 72 73 return np; 74 } 75 76 static struct device_node *find_dlpar_node(char *drc_name, int *node_type) 77 { 78 struct device_node *dn; 79 80 dn = find_php_slot_pci_node(drc_name, "SLOT"); 81 if (dn) { 82 *node_type = NODE_TYPE_SLOT; 83 return dn; 84 } 85 86 dn = find_php_slot_pci_node(drc_name, "PHB"); 87 if (dn) { 88 *node_type = NODE_TYPE_PHB; 89 return dn; 90 } 91 92 dn = find_vio_slot_node(drc_name); 93 if (dn) { 94 *node_type = NODE_TYPE_VIO; 95 return dn; 96 } 97 98 return NULL; 99 } 100 101 /** 102 * find_php_slot - return hotplug slot structure for device node 103 * 104 * This routine will return the hotplug slot structure 105 * for a given device node. Note that built-in PCI slots 106 * may be dlpar-able, but not hot-pluggable, so this routine 107 * will return NULL for built-in PCI slots. 108 */ 109 static struct slot *find_php_slot(struct device_node *dn) 110 { 111 struct list_head *tmp, *n; 112 struct slot *slot; 113 114 list_for_each_safe(tmp, n, &rpaphp_slot_head) { 115 slot = list_entry(tmp, struct slot, rpaphp_slot_list); 116 if (slot->dn == dn) 117 return slot; 118 } 119 120 return NULL; 121 } 122 123 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, 124 struct device_node *dev_dn) 125 { 126 struct pci_dev *tmp = NULL; 127 struct device_node *child_dn; 128 129 list_for_each_entry(tmp, &parent->devices, bus_list) { 130 child_dn = pci_device_to_OF_node(tmp); 131 if (child_dn == dev_dn) 132 return tmp; 133 } 134 return NULL; 135 } 136 137 static void dlpar_pci_add_bus(struct device_node *dn) 138 { 139 struct pci_dn *pdn = PCI_DN(dn); 140 struct pci_controller *phb = pdn->phb; 141 struct pci_dev *dev = NULL; 142 143 eeh_add_device_tree_early(dn); 144 145 /* Add EADS device to PHB bus, adding new entry to bus->devices */ 146 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn); 147 if (!dev) { 148 printk(KERN_ERR "%s: failed to create pci dev for %s\n", 149 __FUNCTION__, dn->full_name); 150 return; 151 } 152 153 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 154 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 155 of_scan_pci_bridge(dn, dev); 156 157 pcibios_fixup_new_pci_devices(dev->subordinate,0); 158 159 /* Claim new bus resources */ 160 pcibios_claim_one_bus(dev->bus); 161 162 /* ioremap() for child bus, which may or may not succeed */ 163 remap_bus_range(dev->subordinate); 164 165 /* Add new devices to global lists. Register in proc, sysfs. */ 166 pci_bus_add_devices(phb->bus); 167 } 168 169 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) 170 { 171 struct pci_dev *dev; 172 struct pci_controller *phb; 173 174 if (pcibios_find_pci_bus(dn)) 175 return -EINVAL; 176 177 /* Add pci bus */ 178 dlpar_pci_add_bus(dn); 179 180 /* Confirm new bridge dev was created */ 181 phb = PCI_DN(dn)->phb; 182 dev = dlpar_find_new_dev(phb->bus, dn); 183 184 if (!dev) { 185 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__, 186 drc_name); 187 return -EIO; 188 } 189 190 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 191 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n", 192 __FUNCTION__, dev->hdr_type, drc_name); 193 return -EIO; 194 } 195 196 /* Add hotplug slot */ 197 if (rpaphp_add_slot(dn)) { 198 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 199 __FUNCTION__, drc_name); 200 return -EIO; 201 } 202 return 0; 203 } 204 205 static int dlpar_remove_root_bus(struct pci_controller *phb) 206 { 207 struct pci_bus *phb_bus; 208 int rc; 209 210 phb_bus = phb->bus; 211 if (!(list_empty(&phb_bus->children) && 212 list_empty(&phb_bus->devices))) { 213 return -EBUSY; 214 } 215 216 rc = pcibios_remove_root_bus(phb); 217 if (rc) 218 return -EIO; 219 220 device_unregister(phb_bus->bridge); 221 pci_remove_bus(phb_bus); 222 223 return 0; 224 } 225 226 static int dlpar_remove_phb(char *drc_name, struct device_node *dn) 227 { 228 struct slot *slot; 229 struct pci_dn *pdn; 230 int rc = 0; 231 232 if (!pcibios_find_pci_bus(dn)) 233 return -EINVAL; 234 235 /* If pci slot is hotplugable, use hotplug to remove it */ 236 slot = find_php_slot(dn); 237 if (slot) { 238 if (rpaphp_deregister_slot(slot)) { 239 printk(KERN_ERR 240 "%s: unable to remove hotplug slot %s\n", 241 __FUNCTION__, drc_name); 242 return -EIO; 243 } 244 } 245 246 pdn = dn->data; 247 BUG_ON(!pdn || !pdn->phb); 248 rc = dlpar_remove_root_bus(pdn->phb); 249 if (rc < 0) 250 return rc; 251 252 pdn->phb = NULL; 253 254 return 0; 255 } 256 257 static int dlpar_add_phb(char *drc_name, struct device_node *dn) 258 { 259 struct pci_controller *phb; 260 261 if (PCI_DN(dn) && PCI_DN(dn)->phb) { 262 /* PHB already exists */ 263 return -EINVAL; 264 } 265 266 phb = init_phb_dynamic(dn); 267 if (!phb) 268 return -EIO; 269 270 if (rpaphp_add_slot(dn)) { 271 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 272 __FUNCTION__, drc_name); 273 return -EIO; 274 } 275 return 0; 276 } 277 278 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) 279 { 280 if (vio_find_node(dn)) 281 return -EINVAL; 282 283 if (!vio_register_device_node(dn)) { 284 printk(KERN_ERR 285 "%s: failed to register vio node %s\n", 286 __FUNCTION__, drc_name); 287 return -EIO; 288 } 289 return 0; 290 } 291 292 /** 293 * dlpar_add_slot - DLPAR add an I/O Slot 294 * @drc_name: drc-name of newly added slot 295 * 296 * Make the hotplug module and the kernel aware 297 * of a newly added I/O Slot. 298 * Return Codes - 299 * 0 Success 300 * -ENODEV Not a valid drc_name 301 * -EINVAL Slot already added 302 * -ERESTARTSYS Signalled before obtaining lock 303 * -EIO Internal PCI Error 304 */ 305 int dlpar_add_slot(char *drc_name) 306 { 307 struct device_node *dn = NULL; 308 int node_type; 309 int rc = -EIO; 310 311 if (mutex_lock_interruptible(&rpadlpar_mutex)) 312 return -ERESTARTSYS; 313 314 /* Find newly added node */ 315 dn = find_dlpar_node(drc_name, &node_type); 316 if (!dn) { 317 rc = -ENODEV; 318 goto exit; 319 } 320 321 switch (node_type) { 322 case NODE_TYPE_VIO: 323 rc = dlpar_add_vio_slot(drc_name, dn); 324 break; 325 case NODE_TYPE_SLOT: 326 rc = dlpar_add_pci_slot(drc_name, dn); 327 break; 328 case NODE_TYPE_PHB: 329 rc = dlpar_add_phb(drc_name, dn); 330 break; 331 } 332 333 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); 334 exit: 335 mutex_unlock(&rpadlpar_mutex); 336 return rc; 337 } 338 339 /** 340 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot 341 * @drc_name: drc-name of newly added slot 342 * 343 * Remove the kernel and hotplug representations 344 * of an I/O Slot. 345 * Return Codes: 346 * 0 Success 347 * -EINVAL Vio dev doesn't exist 348 */ 349 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn) 350 { 351 struct vio_dev *vio_dev; 352 353 vio_dev = vio_find_node(dn); 354 if (!vio_dev) 355 return -EINVAL; 356 357 vio_unregister_device(vio_dev); 358 return 0; 359 } 360 361 /** 362 * dlpar_remove_slot - DLPAR remove a PCI I/O Slot 363 * @drc_name: drc-name of newly added slot 364 * 365 * Remove the kernel and hotplug representations 366 * of a PCI I/O Slot. 367 * Return Codes: 368 * 0 Success 369 * -ENODEV Not a valid drc_name 370 * -EIO Internal PCI Error 371 */ 372 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) 373 { 374 struct pci_bus *bus; 375 struct slot *slot; 376 377 bus = pcibios_find_pci_bus(dn); 378 if (!bus) 379 return -EINVAL; 380 381 /* If pci slot is hotplugable, use hotplug to remove it */ 382 slot = find_php_slot(dn); 383 if (slot) { 384 if (rpaphp_deregister_slot(slot)) { 385 printk(KERN_ERR 386 "%s: unable to remove hotplug slot %s\n", 387 __FUNCTION__, drc_name); 388 return -EIO; 389 } 390 } else 391 pcibios_remove_pci_devices(bus); 392 393 if (unmap_bus_range(bus)) { 394 printk(KERN_ERR "%s: failed to unmap bus range\n", 395 __FUNCTION__); 396 return -ERANGE; 397 } 398 399 BUG_ON(!bus->self); 400 pci_remove_bus_device(bus->self); 401 return 0; 402 } 403 404 /** 405 * dlpar_remove_slot - DLPAR remove an I/O Slot 406 * @drc_name: drc-name of newly added slot 407 * 408 * Remove the kernel and hotplug representations 409 * of an I/O Slot. 410 * Return Codes: 411 * 0 Success 412 * -ENODEV Not a valid drc_name 413 * -EINVAL Slot already removed 414 * -ERESTARTSYS Signalled before obtaining lock 415 * -EIO Internal Error 416 */ 417 int dlpar_remove_slot(char *drc_name) 418 { 419 struct device_node *dn; 420 int node_type; 421 int rc = 0; 422 423 if (mutex_lock_interruptible(&rpadlpar_mutex)) 424 return -ERESTARTSYS; 425 426 dn = find_dlpar_node(drc_name, &node_type); 427 if (!dn) { 428 rc = -ENODEV; 429 goto exit; 430 } 431 432 switch (node_type) { 433 case NODE_TYPE_VIO: 434 rc = dlpar_remove_vio_slot(drc_name, dn); 435 break; 436 case NODE_TYPE_PHB: 437 rc = dlpar_remove_phb(drc_name, dn); 438 break; 439 case NODE_TYPE_SLOT: 440 rc = dlpar_remove_pci_slot(drc_name, dn); 441 break; 442 } 443 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); 444 exit: 445 mutex_unlock(&rpadlpar_mutex); 446 return rc; 447 } 448 449 static inline int is_dlpar_capable(void) 450 { 451 int rc = rtas_token("ibm,configure-connector"); 452 453 return (int) (rc != RTAS_UNKNOWN_SERVICE); 454 } 455 456 int __init rpadlpar_io_init(void) 457 { 458 int rc = 0; 459 460 if (!is_dlpar_capable()) { 461 printk(KERN_WARNING "%s: partition not DLPAR capable\n", 462 __FUNCTION__); 463 return -EPERM; 464 } 465 466 rc = dlpar_sysfs_init(); 467 return rc; 468 } 469 470 void rpadlpar_io_exit(void) 471 { 472 dlpar_sysfs_exit(); 473 return; 474 } 475 476 module_init(rpadlpar_io_init); 477 module_exit(rpadlpar_io_exit); 478 MODULE_LICENSE("GPL"); 479