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 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 161 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 162 of_scan_pci_bridge(dev); 163 164 /* Map IO space for child bus, which may or may not succeed */ 165 pcibios_map_io_space(dev->subordinate); 166 167 /* Finish adding it : resource allocation, adding devices, etc... 168 * Note that we need to perform the finish pass on the -parent- 169 * bus of the EADS bridge so the bridge device itself gets 170 * properly added 171 */ 172 pcibios_finish_adding_to_bus(phb->bus); 173 } 174 175 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) 176 { 177 struct pci_dev *dev; 178 struct pci_controller *phb; 179 180 if (pcibios_find_pci_bus(dn)) 181 return -EINVAL; 182 183 /* Add pci bus */ 184 dlpar_pci_add_bus(dn); 185 186 /* Confirm new bridge dev was created */ 187 phb = PCI_DN(dn)->phb; 188 dev = dlpar_find_new_dev(phb->bus, dn); 189 190 if (!dev) { 191 printk(KERN_ERR "%s: unable to add bus %s\n", __func__, 192 drc_name); 193 return -EIO; 194 } 195 196 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 197 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n", 198 __func__, dev->hdr_type, drc_name); 199 return -EIO; 200 } 201 202 /* Add hotplug slot */ 203 if (rpaphp_add_slot(dn)) { 204 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 205 __func__, drc_name); 206 return -EIO; 207 } 208 return 0; 209 } 210 211 static int dlpar_remove_phb(char *drc_name, struct device_node *dn) 212 { 213 struct slot *slot; 214 struct pci_dn *pdn; 215 int rc = 0; 216 217 if (!pcibios_find_pci_bus(dn)) 218 return -EINVAL; 219 220 /* If pci slot is hotplugable, use hotplug to remove it */ 221 slot = find_php_slot(dn); 222 if (slot && rpaphp_deregister_slot(slot)) { 223 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n", 224 __func__, drc_name); 225 return -EIO; 226 } 227 228 pdn = dn->data; 229 BUG_ON(!pdn || !pdn->phb); 230 rc = remove_phb_dynamic(pdn->phb); 231 if (rc < 0) 232 return rc; 233 234 pdn->phb = NULL; 235 236 return 0; 237 } 238 239 static int dlpar_add_phb(char *drc_name, struct device_node *dn) 240 { 241 struct pci_controller *phb; 242 243 if (PCI_DN(dn) && PCI_DN(dn)->phb) { 244 /* PHB already exists */ 245 return -EINVAL; 246 } 247 248 phb = init_phb_dynamic(dn); 249 if (!phb) 250 return -EIO; 251 252 if (rpaphp_add_slot(dn)) { 253 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 254 __func__, drc_name); 255 return -EIO; 256 } 257 return 0; 258 } 259 260 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) 261 { 262 if (vio_find_node(dn)) 263 return -EINVAL; 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 return 0; 340 } 341 342 /** 343 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot 344 * @drc_name: drc-name of newly added slot 345 * @dn: &device_node 346 * 347 * Remove the kernel and hotplug representations of a PCI I/O Slot. 348 * Return Codes: 349 * 0 Success 350 * -ENODEV Not a valid drc_name 351 * -EIO Internal PCI Error 352 */ 353 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) 354 { 355 struct pci_bus *bus; 356 struct slot *slot; 357 358 bus = pcibios_find_pci_bus(dn); 359 if (!bus) 360 return -EINVAL; 361 362 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n", 363 bus->self ? pci_name(bus->self) : "<!PHB!>"); 364 365 slot = find_php_slot(dn); 366 if (slot) { 367 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n", 368 pci_domain_nr(bus), bus->number); 369 370 if (rpaphp_deregister_slot(slot)) { 371 printk(KERN_ERR 372 "%s: unable to remove hotplug slot %s\n", 373 __func__, drc_name); 374 return -EIO; 375 } 376 } 377 378 /* Remove all devices below slot */ 379 pcibios_remove_pci_devices(bus); 380 381 /* Unmap PCI IO space */ 382 if (pcibios_unmap_io_space(bus)) { 383 printk(KERN_ERR "%s: failed to unmap bus range\n", 384 __func__); 385 return -ERANGE; 386 } 387 388 /* Remove the EADS bridge device itself */ 389 BUG_ON(!bus->self); 390 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self)); 391 eeh_remove_bus_device(bus->self, true); 392 pci_stop_and_remove_bus_device(bus->self); 393 394 return 0; 395 } 396 397 /** 398 * dlpar_remove_slot - DLPAR remove an I/O Slot 399 * @drc_name: drc-name of newly added slot 400 * 401 * Remove the kernel and hotplug representations of an I/O Slot. 402 * Return Codes: 403 * 0 Success 404 * -ENODEV Not a valid drc_name 405 * -EINVAL Slot already removed 406 * -ERESTARTSYS Signalled before obtaining lock 407 * -EIO Internal Error 408 */ 409 int dlpar_remove_slot(char *drc_name) 410 { 411 struct device_node *dn; 412 int node_type; 413 int rc = 0; 414 415 if (mutex_lock_interruptible(&rpadlpar_mutex)) 416 return -ERESTARTSYS; 417 418 dn = find_dlpar_node(drc_name, &node_type); 419 if (!dn) { 420 rc = -ENODEV; 421 goto exit; 422 } 423 424 switch (node_type) { 425 case NODE_TYPE_VIO: 426 rc = dlpar_remove_vio_slot(drc_name, dn); 427 break; 428 case NODE_TYPE_PHB: 429 rc = dlpar_remove_phb(drc_name, dn); 430 break; 431 case NODE_TYPE_SLOT: 432 rc = dlpar_remove_pci_slot(drc_name, dn); 433 break; 434 } 435 vm_unmap_aliases(); 436 437 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); 438 exit: 439 mutex_unlock(&rpadlpar_mutex); 440 return rc; 441 } 442 443 static inline int is_dlpar_capable(void) 444 { 445 int rc = rtas_token("ibm,configure-connector"); 446 447 return (int) (rc != RTAS_UNKNOWN_SERVICE); 448 } 449 450 int __init rpadlpar_io_init(void) 451 { 452 int rc = 0; 453 454 if (!is_dlpar_capable()) { 455 printk(KERN_WARNING "%s: partition not DLPAR capable\n", 456 __func__); 457 return -EPERM; 458 } 459 460 rc = dlpar_sysfs_init(); 461 return rc; 462 } 463 464 void rpadlpar_io_exit(void) 465 { 466 dlpar_sysfs_exit(); 467 return; 468 } 469 470 module_init(rpadlpar_io_init); 471 module_exit(rpadlpar_io_exit); 472 MODULE_LICENSE("GPL"); 473