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 #include <linux/firmware.h> 31 32 #include "../pci.h" 33 #include "rpaphp.h" 34 #include "rpadlpar.h" 35 36 static DEFINE_MUTEX(rpadlpar_mutex); 37 38 #define DLPAR_MODULE_NAME "rpadlpar_io" 39 40 #define NODE_TYPE_VIO 1 41 #define NODE_TYPE_SLOT 2 42 #define NODE_TYPE_PHB 3 43 44 static struct device_node *find_vio_slot_node(char *drc_name) 45 { 46 struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); 47 struct device_node *dn = NULL; 48 int rc; 49 50 if (!parent) 51 return NULL; 52 53 while ((dn = of_get_next_child(parent, dn))) { 54 rc = rpaphp_check_drc_props(dn, drc_name, NULL); 55 if (rc == 0) 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 int rc; 68 69 while ((np = of_find_node_by_name(np, "pci"))) { 70 rc = rpaphp_check_drc_props(np, drc_name, drc_type); 71 if (rc == 0) 72 break; 73 } 74 75 return np; 76 } 77 78 static struct device_node *find_dlpar_node(char *drc_name, int *node_type) 79 { 80 struct device_node *dn; 81 82 dn = find_php_slot_pci_node(drc_name, "SLOT"); 83 if (dn) { 84 *node_type = NODE_TYPE_SLOT; 85 return dn; 86 } 87 88 dn = find_php_slot_pci_node(drc_name, "PHB"); 89 if (dn) { 90 *node_type = NODE_TYPE_PHB; 91 return dn; 92 } 93 94 dn = find_vio_slot_node(drc_name); 95 if (dn) { 96 *node_type = NODE_TYPE_VIO; 97 return dn; 98 } 99 100 return NULL; 101 } 102 103 /** 104 * find_php_slot - return hotplug slot structure for device node 105 * @dn: target &device_node 106 * 107 * This routine will return the hotplug slot structure 108 * for a given device node. Note that built-in PCI slots 109 * may be dlpar-able, but not hot-pluggable, so this routine 110 * will return NULL for built-in PCI slots. 111 */ 112 static struct slot *find_php_slot(struct device_node *dn) 113 { 114 struct slot *slot, *next; 115 116 list_for_each_entry_safe(slot, next, &rpaphp_slot_head, 117 rpaphp_slot_list) { 118 if (slot->dn == dn) 119 return slot; 120 } 121 122 return NULL; 123 } 124 125 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, 126 struct device_node *dev_dn) 127 { 128 struct pci_dev *tmp = NULL; 129 struct device_node *child_dn; 130 131 list_for_each_entry(tmp, &parent->devices, bus_list) { 132 child_dn = pci_device_to_OF_node(tmp); 133 if (child_dn == dev_dn) 134 return tmp; 135 } 136 return NULL; 137 } 138 139 static void dlpar_pci_add_bus(struct device_node *dn) 140 { 141 struct pci_dn *pdn = PCI_DN(dn); 142 struct pci_controller *phb = pdn->phb; 143 struct pci_dev *dev = NULL; 144 145 eeh_add_device_tree_early(pdn); 146 147 /* Add EADS device to PHB bus, adding new entry to bus->devices */ 148 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn); 149 if (!dev) { 150 printk(KERN_ERR "%s: failed to create pci dev for %pOF\n", 151 __func__, dn); 152 return; 153 } 154 155 /* Scan below the new bridge */ 156 if (pci_is_bridge(dev)) 157 of_scan_pci_bridge(dev); 158 159 /* Map IO space for child bus, which may or may not succeed */ 160 pcibios_map_io_space(dev->subordinate); 161 162 /* Finish adding it : resource allocation, adding devices, etc... 163 * Note that we need to perform the finish pass on the -parent- 164 * bus of the EADS bridge so the bridge device itself gets 165 * properly added 166 */ 167 pcibios_finish_adding_to_bus(phb->bus); 168 } 169 170 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) 171 { 172 struct pci_dev *dev; 173 struct pci_controller *phb; 174 175 if (pci_find_bus_by_node(dn)) 176 return -EINVAL; 177 178 /* Add pci bus */ 179 dlpar_pci_add_bus(dn); 180 181 /* Confirm new bridge dev was created */ 182 phb = PCI_DN(dn)->phb; 183 dev = dlpar_find_new_dev(phb->bus, dn); 184 185 if (!dev) { 186 printk(KERN_ERR "%s: unable to add bus %s\n", __func__, 187 drc_name); 188 return -EIO; 189 } 190 191 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 192 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n", 193 __func__, dev->hdr_type, drc_name); 194 return -EIO; 195 } 196 197 /* Add hotplug slot */ 198 if (rpaphp_add_slot(dn)) { 199 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 200 __func__, drc_name); 201 return -EIO; 202 } 203 return 0; 204 } 205 206 static int dlpar_remove_phb(char *drc_name, struct device_node *dn) 207 { 208 struct slot *slot; 209 struct pci_dn *pdn; 210 int rc = 0; 211 212 if (!pci_find_bus_by_node(dn)) 213 return -EINVAL; 214 215 /* If pci slot is hotpluggable, use hotplug to remove it */ 216 slot = find_php_slot(dn); 217 if (slot && rpaphp_deregister_slot(slot)) { 218 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n", 219 __func__, drc_name); 220 return -EIO; 221 } 222 223 pdn = dn->data; 224 BUG_ON(!pdn || !pdn->phb); 225 rc = remove_phb_dynamic(pdn->phb); 226 if (rc < 0) 227 return rc; 228 229 pdn->phb = NULL; 230 231 return 0; 232 } 233 234 static int dlpar_add_phb(char *drc_name, struct device_node *dn) 235 { 236 struct pci_controller *phb; 237 238 if (PCI_DN(dn) && PCI_DN(dn)->phb) { 239 /* PHB already exists */ 240 return -EINVAL; 241 } 242 243 phb = init_phb_dynamic(dn); 244 if (!phb) 245 return -EIO; 246 247 if (rpaphp_add_slot(dn)) { 248 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 249 __func__, drc_name); 250 return -EIO; 251 } 252 return 0; 253 } 254 255 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) 256 { 257 struct vio_dev *vio_dev; 258 259 vio_dev = vio_find_node(dn); 260 if (vio_dev) { 261 put_device(&vio_dev->dev); 262 return -EINVAL; 263 } 264 265 if (!vio_register_device_node(dn)) { 266 printk(KERN_ERR 267 "%s: failed to register vio node %s\n", 268 __func__, drc_name); 269 return -EIO; 270 } 271 return 0; 272 } 273 274 /** 275 * dlpar_add_slot - DLPAR add an I/O Slot 276 * @drc_name: drc-name of newly added slot 277 * 278 * Make the hotplug module and the kernel aware of a newly added I/O Slot. 279 * Return Codes: 280 * 0 Success 281 * -ENODEV Not a valid drc_name 282 * -EINVAL Slot already added 283 * -ERESTARTSYS Signalled before obtaining lock 284 * -EIO Internal PCI Error 285 */ 286 int dlpar_add_slot(char *drc_name) 287 { 288 struct device_node *dn = NULL; 289 int node_type; 290 int rc = -EIO; 291 292 if (mutex_lock_interruptible(&rpadlpar_mutex)) 293 return -ERESTARTSYS; 294 295 /* Find newly added node */ 296 dn = find_dlpar_node(drc_name, &node_type); 297 if (!dn) { 298 rc = -ENODEV; 299 goto exit; 300 } 301 302 switch (node_type) { 303 case NODE_TYPE_VIO: 304 rc = dlpar_add_vio_slot(drc_name, dn); 305 break; 306 case NODE_TYPE_SLOT: 307 rc = dlpar_add_pci_slot(drc_name, dn); 308 break; 309 case NODE_TYPE_PHB: 310 rc = dlpar_add_phb(drc_name, dn); 311 break; 312 } 313 314 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); 315 exit: 316 mutex_unlock(&rpadlpar_mutex); 317 return rc; 318 } 319 320 /** 321 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot 322 * @drc_name: drc-name of newly added slot 323 * @dn: &device_node 324 * 325 * Remove the kernel and hotplug representations of an I/O Slot. 326 * Return Codes: 327 * 0 Success 328 * -EINVAL Vio dev doesn't exist 329 */ 330 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn) 331 { 332 struct vio_dev *vio_dev; 333 334 vio_dev = vio_find_node(dn); 335 if (!vio_dev) 336 return -EINVAL; 337 338 vio_unregister_device(vio_dev); 339 340 put_device(&vio_dev->dev); 341 342 return 0; 343 } 344 345 /** 346 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot 347 * @drc_name: drc-name of newly added slot 348 * @dn: &device_node 349 * 350 * Remove the kernel and hotplug representations of a PCI I/O Slot. 351 * Return Codes: 352 * 0 Success 353 * -ENODEV Not a valid drc_name 354 * -EIO Internal PCI Error 355 */ 356 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) 357 { 358 struct pci_bus *bus; 359 struct slot *slot; 360 int ret = 0; 361 362 pci_lock_rescan_remove(); 363 364 bus = pci_find_bus_by_node(dn); 365 if (!bus) { 366 ret = -EINVAL; 367 goto out; 368 } 369 370 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n", 371 bus->self ? pci_name(bus->self) : "<!PHB!>"); 372 373 slot = find_php_slot(dn); 374 if (slot) { 375 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n", 376 pci_domain_nr(bus), bus->number); 377 378 if (rpaphp_deregister_slot(slot)) { 379 printk(KERN_ERR 380 "%s: unable to remove hotplug slot %s\n", 381 __func__, drc_name); 382 ret = -EIO; 383 goto out; 384 } 385 } 386 387 /* Remove all devices below slot */ 388 pci_hp_remove_devices(bus); 389 390 /* Unmap PCI IO space */ 391 if (pcibios_unmap_io_space(bus)) { 392 printk(KERN_ERR "%s: failed to unmap bus range\n", 393 __func__); 394 ret = -ERANGE; 395 goto out; 396 } 397 398 /* Remove the EADS bridge device itself */ 399 BUG_ON(!bus->self); 400 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self)); 401 pci_stop_and_remove_bus_device(bus->self); 402 403 out: 404 pci_unlock_rescan_remove(); 405 return ret; 406 } 407 408 /** 409 * dlpar_remove_slot - DLPAR remove an I/O Slot 410 * @drc_name: drc-name of newly added slot 411 * 412 * Remove the kernel and hotplug representations of an I/O Slot. 413 * Return Codes: 414 * 0 Success 415 * -ENODEV Not a valid drc_name 416 * -EINVAL Slot already removed 417 * -ERESTARTSYS Signalled before obtaining lock 418 * -EIO Internal Error 419 */ 420 int dlpar_remove_slot(char *drc_name) 421 { 422 struct device_node *dn; 423 int node_type; 424 int rc = 0; 425 426 if (mutex_lock_interruptible(&rpadlpar_mutex)) 427 return -ERESTARTSYS; 428 429 dn = find_dlpar_node(drc_name, &node_type); 430 if (!dn) { 431 rc = -ENODEV; 432 goto exit; 433 } 434 435 switch (node_type) { 436 case NODE_TYPE_VIO: 437 rc = dlpar_remove_vio_slot(drc_name, dn); 438 break; 439 case NODE_TYPE_PHB: 440 rc = dlpar_remove_phb(drc_name, dn); 441 break; 442 case NODE_TYPE_SLOT: 443 rc = dlpar_remove_pci_slot(drc_name, dn); 444 break; 445 } 446 vm_unmap_aliases(); 447 448 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); 449 exit: 450 mutex_unlock(&rpadlpar_mutex); 451 return rc; 452 } 453 454 static inline int is_dlpar_capable(void) 455 { 456 int rc = rtas_token("ibm,configure-connector"); 457 458 return (int) (rc != RTAS_UNKNOWN_SERVICE); 459 } 460 461 int __init rpadlpar_io_init(void) 462 { 463 464 if (!is_dlpar_capable()) { 465 printk(KERN_WARNING "%s: partition not DLPAR capable\n", 466 __func__); 467 return -EPERM; 468 } 469 470 return dlpar_sysfs_init(); 471 } 472 473 void rpadlpar_io_exit(void) 474 { 475 dlpar_sysfs_exit(); 476 return; 477 } 478 479 module_init(rpadlpar_io_init); 480 module_exit(rpadlpar_io_exit); 481 MODULE_LICENSE("GPL"); 482