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 27 static 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 35 static 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 */ 55 static 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 73 static 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 98 static 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 } 111 112 static 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 } 133 134 static int pci_add_secondary_bus(struct device_node *dn, 135 struct pci_dev *bridge_dev) 136 { 137 struct pci_dn *pdn = dn->data; 138 struct pci_controller *hose = pdn->phb; 139 struct pci_bus *child; 140 u8 sec_busno; 141 142 /* Get busno of downstream bus */ 143 pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno); 144 145 /* Allocate and add to children of bridge_dev->bus */ 146 child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno); 147 if (!child) { 148 printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__); 149 return -ENOMEM; 150 } 151 152 sprintf(child->name, "PCI Bus #%02x", child->number); 153 154 /* Fixup subordinate bridge bases and resources */ 155 pcibios_fixup_bus(child); 156 157 /* Claim new bus resources */ 158 rpadlpar_claim_one_bus(bridge_dev->bus); 159 160 if (hose->last_busno < child->number) 161 hose->last_busno = child->number; 162 163 pdn->bussubno = child->number; 164 165 /* ioremap() for child bus, which may or may not succeed */ 166 remap_bus_range(child); 167 168 return 0; 169 } 170 171 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, 172 struct device_node *dev_dn) 173 { 174 struct pci_dev *tmp = NULL; 175 struct device_node *child_dn; 176 177 list_for_each_entry(tmp, &parent->devices, bus_list) { 178 child_dn = pci_device_to_OF_node(tmp); 179 if (child_dn == dev_dn) 180 return tmp; 181 } 182 return NULL; 183 } 184 185 static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn) 186 { 187 struct pci_dn *pdn = dn->data; 188 struct pci_controller *hose = pdn->phb; 189 struct pci_dev *dev = NULL; 190 191 /* Scan phb bus for EADS device, adding new one to bus->devices */ 192 if (!pci_scan_single_device(hose->bus, pdn->devfn)) { 193 printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__); 194 return NULL; 195 } 196 197 /* Add new devices to global lists. Register in proc, sysfs. */ 198 pci_bus_add_devices(hose->bus); 199 200 /* Confirm new bridge dev was created */ 201 dev = dlpar_find_new_dev(hose->bus, dn); 202 if (dev) { 203 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 204 printk(KERN_ERR "%s: unexpected header type %d\n", 205 __FUNCTION__, dev->hdr_type); 206 return NULL; 207 } 208 209 if (pci_add_secondary_bus(dn, dev)) 210 return NULL; 211 } 212 213 return dev; 214 } 215 216 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) 217 { 218 struct pci_dev *dev; 219 int rc; 220 221 if (rpaphp_find_pci_bus(dn)) 222 return -EINVAL; 223 224 /* Add pci bus */ 225 dev = dlpar_pci_add_bus(dn); 226 if (!dev) { 227 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__, 228 drc_name); 229 return -EIO; 230 } 231 232 if (dn->child) { 233 rc = rpaphp_config_pci_adapter(dev->subordinate); 234 if (rc < 0) { 235 printk(KERN_ERR "%s: unable to enable slot %s\n", 236 __FUNCTION__, drc_name); 237 return -EIO; 238 } 239 } 240 241 /* Add hotplug slot */ 242 if (rpaphp_add_slot(dn)) { 243 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 244 __FUNCTION__, drc_name); 245 return -EIO; 246 } 247 return 0; 248 } 249 250 static int dlpar_remove_root_bus(struct pci_controller *phb) 251 { 252 struct pci_bus *phb_bus; 253 int rc; 254 255 phb_bus = phb->bus; 256 if (!(list_empty(&phb_bus->children) && 257 list_empty(&phb_bus->devices))) { 258 return -EBUSY; 259 } 260 261 rc = pcibios_remove_root_bus(phb); 262 if (rc) 263 return -EIO; 264 265 device_unregister(phb_bus->bridge); 266 pci_remove_bus(phb_bus); 267 268 return 0; 269 } 270 271 static int dlpar_remove_phb(char *drc_name, struct device_node *dn) 272 { 273 struct slot *slot; 274 struct pci_dn *pdn; 275 int rc = 0; 276 277 if (!rpaphp_find_pci_bus(dn)) 278 return -EINVAL; 279 280 slot = find_slot(dn); 281 if (slot) { 282 /* Remove hotplug slot */ 283 if (rpaphp_remove_slot(slot)) { 284 printk(KERN_ERR 285 "%s: unable to remove hotplug slot %s\n", 286 __FUNCTION__, drc_name); 287 return -EIO; 288 } 289 } 290 291 pdn = dn->data; 292 BUG_ON(!pdn || !pdn->phb); 293 rc = dlpar_remove_root_bus(pdn->phb); 294 if (rc < 0) 295 return rc; 296 297 pdn->phb = NULL; 298 299 return 0; 300 } 301 302 static int dlpar_add_phb(char *drc_name, struct device_node *dn) 303 { 304 struct pci_controller *phb; 305 306 if (PCI_DN(dn)->phb) { 307 /* PHB already exists */ 308 return -EINVAL; 309 } 310 311 phb = init_phb_dynamic(dn); 312 if (!phb) 313 return -EIO; 314 315 if (rpaphp_add_slot(dn)) { 316 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 317 __FUNCTION__, drc_name); 318 return -EIO; 319 } 320 return 0; 321 } 322 323 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) 324 { 325 if (vio_find_node(dn)) 326 return -EINVAL; 327 328 if (!vio_register_device_node(dn)) { 329 printk(KERN_ERR 330 "%s: failed to register vio node %s\n", 331 __FUNCTION__, drc_name); 332 return -EIO; 333 } 334 return 0; 335 } 336 337 /** 338 * dlpar_add_slot - DLPAR add an I/O Slot 339 * @drc_name: drc-name of newly added slot 340 * 341 * Make the hotplug module and the kernel aware 342 * of a newly added I/O Slot. 343 * Return Codes - 344 * 0 Success 345 * -ENODEV Not a valid drc_name 346 * -EINVAL Slot already added 347 * -ERESTARTSYS Signalled before obtaining lock 348 * -EIO Internal PCI Error 349 */ 350 int dlpar_add_slot(char *drc_name) 351 { 352 struct device_node *dn = NULL; 353 int node_type; 354 int rc = -EIO; 355 356 if (down_interruptible(&rpadlpar_sem)) 357 return -ERESTARTSYS; 358 359 /* Find newly added node */ 360 dn = find_dlpar_node(drc_name, &node_type); 361 if (!dn) { 362 rc = -ENODEV; 363 goto exit; 364 } 365 366 switch (node_type) { 367 case NODE_TYPE_VIO: 368 rc = dlpar_add_vio_slot(drc_name, dn); 369 break; 370 case NODE_TYPE_SLOT: 371 rc = dlpar_add_pci_slot(drc_name, dn); 372 break; 373 case NODE_TYPE_PHB: 374 rc = dlpar_add_phb(drc_name, dn); 375 break; 376 } 377 378 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); 379 exit: 380 up(&rpadlpar_sem); 381 return rc; 382 } 383 384 /** 385 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot 386 * @drc_name: drc-name of newly added slot 387 * 388 * Remove the kernel and hotplug representations 389 * of an I/O Slot. 390 * Return Codes: 391 * 0 Success 392 * -EINVAL Vio dev doesn't exist 393 */ 394 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn) 395 { 396 struct vio_dev *vio_dev; 397 398 vio_dev = vio_find_node(dn); 399 if (!vio_dev) 400 return -EINVAL; 401 402 vio_unregister_device(vio_dev); 403 return 0; 404 } 405 406 /** 407 * dlpar_remove_slot - DLPAR remove a PCI I/O Slot 408 * @drc_name: drc-name of newly added slot 409 * 410 * Remove the kernel and hotplug representations 411 * of a PCI I/O Slot. 412 * Return Codes: 413 * 0 Success 414 * -ENODEV Not a valid drc_name 415 * -EIO Internal PCI Error 416 */ 417 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) 418 { 419 struct pci_bus *bus; 420 struct slot *slot; 421 422 bus = rpaphp_find_pci_bus(dn); 423 if (!bus) 424 return -EINVAL; 425 426 slot = find_slot(dn); 427 if (slot) { 428 /* Remove hotplug slot */ 429 if (rpaphp_remove_slot(slot)) { 430 printk(KERN_ERR 431 "%s: unable to remove hotplug slot %s\n", 432 __FUNCTION__, drc_name); 433 return -EIO; 434 } 435 } 436 437 if (unmap_bus_range(bus)) { 438 printk(KERN_ERR "%s: failed to unmap bus range\n", 439 __FUNCTION__); 440 return -ERANGE; 441 } 442 443 BUG_ON(!bus->self); 444 pci_remove_bus_device(bus->self); 445 return 0; 446 } 447 448 /** 449 * dlpar_remove_slot - DLPAR remove an I/O Slot 450 * @drc_name: drc-name of newly added slot 451 * 452 * Remove the kernel and hotplug representations 453 * of an I/O Slot. 454 * Return Codes: 455 * 0 Success 456 * -ENODEV Not a valid drc_name 457 * -EINVAL Slot already removed 458 * -ERESTARTSYS Signalled before obtaining lock 459 * -EIO Internal Error 460 */ 461 int dlpar_remove_slot(char *drc_name) 462 { 463 struct device_node *dn; 464 int node_type; 465 int rc = 0; 466 467 if (down_interruptible(&rpadlpar_sem)) 468 return -ERESTARTSYS; 469 470 dn = find_dlpar_node(drc_name, &node_type); 471 if (!dn) { 472 rc = -ENODEV; 473 goto exit; 474 } 475 476 switch (node_type) { 477 case NODE_TYPE_VIO: 478 rc = dlpar_remove_vio_slot(drc_name, dn); 479 break; 480 case NODE_TYPE_PHB: 481 rc = dlpar_remove_phb(drc_name, dn); 482 break; 483 case NODE_TYPE_SLOT: 484 rc = dlpar_remove_pci_slot(drc_name, dn); 485 break; 486 } 487 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); 488 exit: 489 up(&rpadlpar_sem); 490 return rc; 491 } 492 493 static inline int is_dlpar_capable(void) 494 { 495 int rc = rtas_token("ibm,configure-connector"); 496 497 return (int) (rc != RTAS_UNKNOWN_SERVICE); 498 } 499 500 int __init rpadlpar_io_init(void) 501 { 502 int rc = 0; 503 504 if (!is_dlpar_capable()) { 505 printk(KERN_WARNING "%s: partition not DLPAR capable\n", 506 __FUNCTION__); 507 return -EPERM; 508 } 509 510 rc = dlpar_sysfs_init(); 511 return rc; 512 } 513 514 void rpadlpar_io_exit(void) 515 { 516 dlpar_sysfs_exit(); 517 return; 518 } 519 520 module_init(rpadlpar_io_init); 521 module_exit(rpadlpar_io_exit); 522 MODULE_LICENSE("GPL"); 523