rpadlpar_core.c revision 56d8456b06ad1316bff3c75caed5e06e786f20d8
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 <asm/pci-bridge.h> 20#include <asm/semaphore.h> 21#include <asm/rtas.h> 22#include <asm/vio.h> 23#include "../pci.h" 24#include "rpaphp.h" 25#include "rpadlpar.h" 26 27static DECLARE_MUTEX(rpadlpar_sem); 28 29#define DLPAR_MODULE_NAME "rpadlpar_io" 30 31#define NODE_TYPE_VIO 1 32#define NODE_TYPE_SLOT 2 33#define NODE_TYPE_PHB 3 34 35static struct device_node *find_vio_slot_node(char *drc_name) 36{ 37 struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); 38 struct device_node *dn = NULL; 39 char *name; 40 int rc; 41 42 if (!parent) 43 return NULL; 44 45 while ((dn = of_get_next_child(parent, dn))) { 46 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL); 47 if ((rc == 0) && (!strcmp(drc_name, name))) 48 break; 49 } 50 51 return dn; 52} 53 54/* Find dlpar-capable pci node that contains the specified name and type */ 55static struct device_node *find_php_slot_pci_node(char *drc_name, 56 char *drc_type) 57{ 58 struct device_node *np = NULL; 59 char *name; 60 char *type; 61 int rc; 62 63 while ((np = of_find_node_by_type(np, "pci"))) { 64 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL); 65 if (rc == 0) 66 if (!strcmp(drc_name, name) && !strcmp(drc_type, type)) 67 break; 68 } 69 70 return np; 71} 72 73static struct device_node *find_dlpar_node(char *drc_name, int *node_type) 74{ 75 struct device_node *dn; 76 77 dn = find_php_slot_pci_node(drc_name, "SLOT"); 78 if (dn) { 79 *node_type = NODE_TYPE_SLOT; 80 return dn; 81 } 82 83 dn = find_php_slot_pci_node(drc_name, "PHB"); 84 if (dn) { 85 *node_type = NODE_TYPE_PHB; 86 return dn; 87 } 88 89 dn = find_vio_slot_node(drc_name); 90 if (dn) { 91 *node_type = NODE_TYPE_VIO; 92 return dn; 93 } 94 95 return NULL; 96} 97 98static struct slot *find_slot(struct device_node *dn) 99{ 100 struct list_head *tmp, *n; 101 struct slot *slot; 102 103 list_for_each_safe(tmp, n, &rpaphp_slot_head) { 104 slot = list_entry(tmp, struct slot, rpaphp_slot_list); 105 if (slot->dn == dn) 106 return slot; 107 } 108 109 return NULL; 110} 111 112static void rpadlpar_claim_one_bus(struct pci_bus *b) 113{ 114 struct list_head *ld; 115 struct pci_bus *child_bus; 116 117 for (ld = b->devices.next; ld != &b->devices; ld = ld->next) { 118 struct pci_dev *dev = pci_dev_b(ld); 119 int i; 120 121 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 122 struct resource *r = &dev->resource[i]; 123 124 if (r->parent || !r->start || !r->flags) 125 continue; 126 rpaphp_claim_resource(dev, i); 127 } 128 } 129 130 list_for_each_entry(child_bus, &b->children, node) 131 rpadlpar_claim_one_bus(child_bus); 132} 133 134static int pci_add_secondary_bus(struct device_node *dn, 135 struct pci_dev *bridge_dev) 136{ 137 struct pci_controller *hose = dn->phb; 138 struct pci_bus *child; 139 u8 sec_busno; 140 141 /* Get busno of downstream bus */ 142 pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno); 143 144 /* Allocate and add to children of bridge_dev->bus */ 145 child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno); 146 if (!child) { 147 printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__); 148 return -ENOMEM; 149 } 150 151 sprintf(child->name, "PCI Bus #%02x", child->number); 152 153 /* Fixup subordinate bridge bases and resources */ 154 pcibios_fixup_bus(child); 155 156 /* Claim new bus resources */ 157 rpadlpar_claim_one_bus(bridge_dev->bus); 158 159 if (hose->last_busno < child->number) 160 hose->last_busno = child->number; 161 162 dn->bussubno = child->number; 163 164 /* ioremap() for child bus, which may or may not succeed */ 165 remap_bus_range(child); 166 167 return 0; 168} 169 170static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, 171 struct device_node *dev_dn) 172{ 173 struct pci_dev *tmp = NULL; 174 struct device_node *child_dn; 175 176 list_for_each_entry(tmp, &parent->devices, bus_list) { 177 child_dn = pci_device_to_OF_node(tmp); 178 if (child_dn == dev_dn) 179 return tmp; 180 } 181 return NULL; 182} 183 184static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn) 185{ 186 struct pci_controller *hose = dn->phb; 187 struct pci_dev *dev = NULL; 188 189 /* Scan phb bus for EADS device, adding new one to bus->devices */ 190 if (!pci_scan_single_device(hose->bus, dn->devfn)) { 191 printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__); 192 return NULL; 193 } 194 195 /* Add new devices to global lists. Register in proc, sysfs. */ 196 pci_bus_add_devices(hose->bus); 197 198 /* Confirm new bridge dev was created */ 199 dev = dlpar_find_new_dev(hose->bus, dn); 200 if (dev) { 201 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 202 printk(KERN_ERR "%s: unexpected header type %d\n", 203 __FUNCTION__, dev->hdr_type); 204 return NULL; 205 } 206 207 if (pci_add_secondary_bus(dn, dev)) 208 return NULL; 209 } 210 211 return dev; 212} 213 214static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) 215{ 216 struct pci_dev *dev; 217 int rc; 218 219 if (rpaphp_find_pci_bus(dn)) 220 return -EINVAL; 221 222 /* Add pci bus */ 223 dev = dlpar_pci_add_bus(dn); 224 if (!dev) { 225 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__, 226 drc_name); 227 return -EIO; 228 } 229 230 if (dn->child) { 231 rc = rpaphp_config_pci_adapter(dev->subordinate); 232 if (rc < 0) { 233 printk(KERN_ERR "%s: unable to enable slot %s\n", 234 __FUNCTION__, drc_name); 235 return -EIO; 236 } 237 } 238 239 /* Add hotplug slot */ 240 if (rpaphp_add_slot(dn)) { 241 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 242 __FUNCTION__, drc_name); 243 return -EIO; 244 } 245 return 0; 246} 247 248static int dlpar_remove_root_bus(struct pci_controller *phb) 249{ 250 struct pci_bus *phb_bus; 251 int rc; 252 253 phb_bus = phb->bus; 254 if (!(list_empty(&phb_bus->children) && 255 list_empty(&phb_bus->devices))) { 256 return -EBUSY; 257 } 258 259 rc = pcibios_remove_root_bus(phb); 260 if (rc) 261 return -EIO; 262 263 device_unregister(phb_bus->bridge); 264 pci_remove_bus(phb_bus); 265 266 return 0; 267} 268 269static int dlpar_remove_phb(char *drc_name, struct device_node *dn) 270{ 271 struct slot *slot; 272 int rc = 0; 273 274 if (!rpaphp_find_pci_bus(dn)) 275 return -EINVAL; 276 277 slot = find_slot(dn); 278 if (slot) { 279 /* Remove hotplug slot */ 280 if (rpaphp_remove_slot(slot)) { 281 printk(KERN_ERR 282 "%s: unable to remove hotplug slot %s\n", 283 __FUNCTION__, drc_name); 284 return -EIO; 285 } 286 } 287 288 BUG_ON(!dn->phb); 289 rc = dlpar_remove_root_bus(dn->phb); 290 if (rc < 0) 291 return rc; 292 293 dn->phb = NULL; 294 295 return 0; 296} 297 298static int dlpar_add_phb(char *drc_name, struct device_node *dn) 299{ 300 struct pci_controller *phb; 301 302 if (dn->phb) { 303 /* PHB already exists */ 304 return -EINVAL; 305 } 306 307 phb = init_phb_dynamic(dn); 308 if (!phb) 309 return -EIO; 310 311 if (rpaphp_add_slot(dn)) { 312 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 313 __FUNCTION__, drc_name); 314 return -EIO; 315 } 316 return 0; 317} 318 319static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) 320{ 321 if (vio_find_node(dn)) 322 return -EINVAL; 323 324 if (!vio_register_device_node(dn)) { 325 printk(KERN_ERR 326 "%s: failed to register vio node %s\n", 327 __FUNCTION__, drc_name); 328 return -EIO; 329 } 330 return 0; 331} 332 333/** 334 * dlpar_add_slot - DLPAR add an I/O Slot 335 * @drc_name: drc-name of newly added slot 336 * 337 * Make the hotplug module and the kernel aware 338 * of a newly added I/O Slot. 339 * Return Codes - 340 * 0 Success 341 * -ENODEV Not a valid drc_name 342 * -EINVAL Slot already added 343 * -ERESTARTSYS Signalled before obtaining lock 344 * -EIO Internal PCI Error 345 */ 346int dlpar_add_slot(char *drc_name) 347{ 348 struct device_node *dn = NULL; 349 int node_type; 350 int rc = -EIO; 351 352 if (down_interruptible(&rpadlpar_sem)) 353 return -ERESTARTSYS; 354 355 /* Find newly added node */ 356 dn = find_dlpar_node(drc_name, &node_type); 357 if (!dn) { 358 rc = -ENODEV; 359 goto exit; 360 } 361 362 switch (node_type) { 363 case NODE_TYPE_VIO: 364 rc = dlpar_add_vio_slot(drc_name, dn); 365 break; 366 case NODE_TYPE_SLOT: 367 rc = dlpar_add_pci_slot(drc_name, dn); 368 break; 369 case NODE_TYPE_PHB: 370 rc = dlpar_add_phb(drc_name, dn); 371 break; 372 } 373 374 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); 375exit: 376 up(&rpadlpar_sem); 377 return rc; 378} 379 380/** 381 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot 382 * @drc_name: drc-name of newly added slot 383 * 384 * Remove the kernel and hotplug representations 385 * of an I/O Slot. 386 * Return Codes: 387 * 0 Success 388 * -EINVAL Vio dev doesn't exist 389 */ 390static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn) 391{ 392 struct vio_dev *vio_dev; 393 394 vio_dev = vio_find_node(dn); 395 if (!vio_dev) 396 return -EINVAL; 397 398 vio_unregister_device(vio_dev); 399 return 0; 400} 401 402/** 403 * dlpar_remove_slot - DLPAR remove a PCI I/O Slot 404 * @drc_name: drc-name of newly added slot 405 * 406 * Remove the kernel and hotplug representations 407 * of a PCI I/O Slot. 408 * Return Codes: 409 * 0 Success 410 * -ENODEV Not a valid drc_name 411 * -EIO Internal PCI Error 412 */ 413int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) 414{ 415 struct pci_bus *bus; 416 struct slot *slot; 417 418 bus = rpaphp_find_pci_bus(dn); 419 if (!bus) 420 return -EINVAL; 421 422 slot = find_slot(dn); 423 if (slot) { 424 /* Remove hotplug slot */ 425 if (rpaphp_remove_slot(slot)) { 426 printk(KERN_ERR 427 "%s: unable to remove hotplug slot %s\n", 428 __FUNCTION__, drc_name); 429 return -EIO; 430 } 431 } 432 433 if (unmap_bus_range(bus)) { 434 printk(KERN_ERR "%s: failed to unmap bus range\n", 435 __FUNCTION__); 436 return -ERANGE; 437 } 438 439 BUG_ON(!bus->self); 440 pci_remove_bus_device(bus->self); 441 return 0; 442} 443 444/** 445 * dlpar_remove_slot - DLPAR remove an I/O Slot 446 * @drc_name: drc-name of newly added slot 447 * 448 * Remove the kernel and hotplug representations 449 * of an I/O Slot. 450 * Return Codes: 451 * 0 Success 452 * -ENODEV Not a valid drc_name 453 * -EINVAL Slot already removed 454 * -ERESTARTSYS Signalled before obtaining lock 455 * -EIO Internal Error 456 */ 457int dlpar_remove_slot(char *drc_name) 458{ 459 struct device_node *dn; 460 int node_type; 461 int rc = 0; 462 463 if (down_interruptible(&rpadlpar_sem)) 464 return -ERESTARTSYS; 465 466 dn = find_dlpar_node(drc_name, &node_type); 467 if (!dn) { 468 rc = -ENODEV; 469 goto exit; 470 } 471 472 switch (node_type) { 473 case NODE_TYPE_VIO: 474 rc = dlpar_remove_vio_slot(drc_name, dn); 475 break; 476 case NODE_TYPE_PHB: 477 rc = dlpar_remove_phb(drc_name, dn); 478 break; 479 case NODE_TYPE_SLOT: 480 rc = dlpar_remove_pci_slot(drc_name, dn); 481 break; 482 } 483 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); 484exit: 485 up(&rpadlpar_sem); 486 return rc; 487} 488 489static inline int is_dlpar_capable(void) 490{ 491 int rc = rtas_token("ibm,configure-connector"); 492 493 return (int) (rc != RTAS_UNKNOWN_SERVICE); 494} 495 496int __init rpadlpar_io_init(void) 497{ 498 int rc = 0; 499 500 if (!is_dlpar_capable()) { 501 printk(KERN_WARNING "%s: partition not DLPAR capable\n", 502 __FUNCTION__); 503 return -EPERM; 504 } 505 506 rc = dlpar_sysfs_init(); 507 return rc; 508} 509 510void rpadlpar_io_exit(void) 511{ 512 dlpar_sysfs_exit(); 513 return; 514} 515 516module_init(rpadlpar_io_init); 517module_exit(rpadlpar_io_exit); 518MODULE_LICENSE("GPL"); 519