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/module.h> 22 #include <linux/pci.h> 23 #include <linux/string.h> 24 #include <linux/vmalloc.h> 25 26 #include <asm/pci-bridge.h> 27 #include <linux/mutex.h> 28 #include <asm/rtas.h> 29 #include <asm/vio.h> 30 31 #include "../pci.h" 32 #include "rpaphp.h" 33 #include "rpadlpar.h" 34 35 static DEFINE_MUTEX(rpadlpar_mutex); 36 37 #define DLPAR_MODULE_NAME "rpadlpar_io" 38 39 #define NODE_TYPE_VIO 1 40 #define NODE_TYPE_SLOT 2 41 #define NODE_TYPE_PHB 3 42 43 static struct device_node *find_vio_slot_node(char *drc_name) 44 { 45 struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); 46 struct device_node *dn = NULL; 47 char *name; 48 int rc; 49 50 if (!parent) 51 return NULL; 52 53 while ((dn = of_get_next_child(parent, dn))) { 54 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL); 55 if ((rc == 0) && (!strcmp(drc_name, name))) 56 break; 57 } 58 59 return dn; 60 } 61 62 /* Find dlpar-capable pci node that contains the specified name and type */ 63 static struct device_node *find_php_slot_pci_node(char *drc_name, 64 char *drc_type) 65 { 66 struct device_node *np = NULL; 67 char *name; 68 char *type; 69 int rc; 70 71 while ((np = of_find_node_by_name(np, "pci"))) { 72 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL); 73 if (rc == 0) 74 if (!strcmp(drc_name, name) && !strcmp(drc_type, type)) 75 break; 76 } 77 78 return np; 79 } 80 81 static struct device_node *find_dlpar_node(char *drc_name, int *node_type) 82 { 83 struct device_node *dn; 84 85 dn = find_php_slot_pci_node(drc_name, "SLOT"); 86 if (dn) { 87 *node_type = NODE_TYPE_SLOT; 88 return dn; 89 } 90 91 dn = find_php_slot_pci_node(drc_name, "PHB"); 92 if (dn) { 93 *node_type = NODE_TYPE_PHB; 94 return dn; 95 } 96 97 dn = find_vio_slot_node(drc_name); 98 if (dn) { 99 *node_type = NODE_TYPE_VIO; 100 return dn; 101 } 102 103 return NULL; 104 } 105 106 /** 107 * find_php_slot - return hotplug slot structure for device node 108 * @dn: target &device_node 109 * 110 * This routine will return the hotplug slot structure 111 * for a given device node. Note that built-in PCI slots 112 * may be dlpar-able, but not hot-pluggable, so this routine 113 * will return NULL for built-in PCI slots. 114 */ 115 static struct slot *find_php_slot(struct device_node *dn) 116 { 117 struct list_head *tmp, *n; 118 struct slot *slot; 119 120 list_for_each_safe(tmp, n, &rpaphp_slot_head) { 121 slot = list_entry(tmp, struct slot, rpaphp_slot_list); 122 if (slot->dn == dn) 123 return slot; 124 } 125 126 return NULL; 127 } 128 129 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, 130 struct device_node *dev_dn) 131 { 132 struct pci_dev *tmp = NULL; 133 struct device_node *child_dn; 134 135 list_for_each_entry(tmp, &parent->devices, bus_list) { 136 child_dn = pci_device_to_OF_node(tmp); 137 if (child_dn == dev_dn) 138 return tmp; 139 } 140 return NULL; 141 } 142 143 static void dlpar_pci_add_bus(struct device_node *dn) 144 { 145 struct pci_dn *pdn = PCI_DN(dn); 146 struct pci_controller *phb = pdn->phb; 147 struct pci_dev *dev = NULL; 148 149 eeh_add_device_tree_early(dn); 150 151 /* Add EADS device to PHB bus, adding new entry to bus->devices */ 152 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn); 153 if (!dev) { 154 printk(KERN_ERR "%s: failed to create pci dev for %s\n", 155 __func__, dn->full_name); 156 return; 157 } 158 159 /* Scan below the new bridge */ 160 if (pci_is_bridge(dev)) 161 of_scan_pci_bridge(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 } 173 174 static 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 } 209 210 static 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 hotpluggable, 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 } 237 238 static 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 } 258 259 static 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 */ 285 int 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); 314 exit: 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 */ 329 static 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 */ 352 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) 353 { 354 struct pci_bus *bus; 355 struct slot *slot; 356 int ret = 0; 357 358 pci_lock_rescan_remove(); 359 360 bus = pcibios_find_pci_bus(dn); 361 if (!bus) { 362 ret = -EINVAL; 363 goto out; 364 } 365 366 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n", 367 bus->self ? pci_name(bus->self) : "<!PHB!>"); 368 369 slot = find_php_slot(dn); 370 if (slot) { 371 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n", 372 pci_domain_nr(bus), bus->number); 373 374 if (rpaphp_deregister_slot(slot)) { 375 printk(KERN_ERR 376 "%s: unable to remove hotplug slot %s\n", 377 __func__, drc_name); 378 ret = -EIO; 379 goto out; 380 } 381 } 382 383 /* Remove all devices below slot */ 384 pcibios_remove_pci_devices(bus); 385 386 /* Unmap PCI IO space */ 387 if (pcibios_unmap_io_space(bus)) { 388 printk(KERN_ERR "%s: failed to unmap bus range\n", 389 __func__); 390 ret = -ERANGE; 391 goto out; 392 } 393 394 /* Remove the EADS bridge device itself */ 395 BUG_ON(!bus->self); 396 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self)); 397 pci_stop_and_remove_bus_device(bus->self); 398 399 out: 400 pci_unlock_rescan_remove(); 401 return ret; 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 of an I/O Slot. 409 * Return Codes: 410 * 0 Success 411 * -ENODEV Not a valid drc_name 412 * -EINVAL Slot already removed 413 * -ERESTARTSYS Signalled before obtaining lock 414 * -EIO Internal Error 415 */ 416 int dlpar_remove_slot(char *drc_name) 417 { 418 struct device_node *dn; 419 int node_type; 420 int rc = 0; 421 422 if (mutex_lock_interruptible(&rpadlpar_mutex)) 423 return -ERESTARTSYS; 424 425 dn = find_dlpar_node(drc_name, &node_type); 426 if (!dn) { 427 rc = -ENODEV; 428 goto exit; 429 } 430 431 switch (node_type) { 432 case NODE_TYPE_VIO: 433 rc = dlpar_remove_vio_slot(drc_name, dn); 434 break; 435 case NODE_TYPE_PHB: 436 rc = dlpar_remove_phb(drc_name, dn); 437 break; 438 case NODE_TYPE_SLOT: 439 rc = dlpar_remove_pci_slot(drc_name, dn); 440 break; 441 } 442 vm_unmap_aliases(); 443 444 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); 445 exit: 446 mutex_unlock(&rpadlpar_mutex); 447 return rc; 448 } 449 450 static inline int is_dlpar_capable(void) 451 { 452 int rc = rtas_token("ibm,configure-connector"); 453 454 return (int) (rc != RTAS_UNKNOWN_SERVICE); 455 } 456 457 int __init rpadlpar_io_init(void) 458 { 459 int rc = 0; 460 461 if (!is_dlpar_capable()) { 462 printk(KERN_WARNING "%s: partition not DLPAR capable\n", 463 __func__); 464 return -EPERM; 465 } 466 467 rc = dlpar_sysfs_init(); 468 return rc; 469 } 470 471 void rpadlpar_io_exit(void) 472 { 473 dlpar_sysfs_exit(); 474 return; 475 } 476 477 module_init(rpadlpar_io_init); 478 module_exit(rpadlpar_io_exit); 479 MODULE_LICENSE("GPL"); 480