1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Interface for Dynamic Logical Partitioning of I/O Slots on 4 * RPA-compliant PPC64 platform. 5 * 6 * John Rose <johnrose@austin.ibm.com> 7 * Linda Xie <lxie@us.ibm.com> 8 * 9 * October 2003 10 * 11 * Copyright (C) 2003 IBM. 12 */ 13 14 #undef DEBUG 15 16 #include <linux/init.h> 17 #include <linux/module.h> 18 #include <linux/pci.h> 19 #include <linux/string.h> 20 #include <linux/vmalloc.h> 21 22 #include <asm/pci-bridge.h> 23 #include <linux/mutex.h> 24 #include <asm/rtas.h> 25 #include <asm/vio.h> 26 #include <linux/firmware.h> 27 28 #include "../pci.h" 29 #include "rpaphp.h" 30 #include "rpadlpar.h" 31 32 static DEFINE_MUTEX(rpadlpar_mutex); 33 34 #define DLPAR_MODULE_NAME "rpadlpar_io" 35 36 #define NODE_TYPE_VIO 1 37 #define NODE_TYPE_SLOT 2 38 #define NODE_TYPE_PHB 3 39 40 static struct device_node *find_vio_slot_node(char *drc_name) 41 { 42 struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); 43 struct device_node *dn = NULL; 44 int rc; 45 46 if (!parent) 47 return NULL; 48 49 while ((dn = of_get_next_child(parent, dn))) { 50 rc = rpaphp_check_drc_props(dn, drc_name, NULL); 51 if (rc == 0) 52 break; 53 } 54 of_node_put(parent); 55 56 return dn; 57 } 58 59 /* Find dlpar-capable pci node that contains the specified name and type */ 60 static struct device_node *find_php_slot_pci_node(char *drc_name, 61 char *drc_type) 62 { 63 struct device_node *np = NULL; 64 int rc; 65 66 while ((np = of_find_node_by_name(np, "pci"))) { 67 rc = rpaphp_check_drc_props(np, drc_name, drc_type); 68 if (rc == 0) 69 break; 70 } 71 72 return np; 73 } 74 75 /* Returns a device_node with its reference count incremented */ 76 static struct device_node *find_dlpar_node(char *drc_name, int *node_type) 77 { 78 struct device_node *dn; 79 80 dn = find_php_slot_pci_node(drc_name, "SLOT"); 81 if (dn) { 82 *node_type = NODE_TYPE_SLOT; 83 return dn; 84 } 85 86 dn = find_php_slot_pci_node(drc_name, "PHB"); 87 if (dn) { 88 *node_type = NODE_TYPE_PHB; 89 return dn; 90 } 91 92 dn = find_vio_slot_node(drc_name); 93 if (dn) { 94 *node_type = NODE_TYPE_VIO; 95 return dn; 96 } 97 98 return NULL; 99 } 100 101 /** 102 * find_php_slot - return hotplug slot structure for device node 103 * @dn: target &device_node 104 * 105 * This routine will return the hotplug slot structure 106 * for a given device node. Note that built-in PCI slots 107 * may be dlpar-able, but not hot-pluggable, so this routine 108 * will return NULL for built-in PCI slots. 109 */ 110 static struct slot *find_php_slot(struct device_node *dn) 111 { 112 struct slot *slot, *next; 113 114 list_for_each_entry_safe(slot, next, &rpaphp_slot_head, 115 rpaphp_slot_list) { 116 if (slot->dn == dn) 117 return slot; 118 } 119 120 return NULL; 121 } 122 123 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, 124 struct device_node *dev_dn) 125 { 126 struct pci_dev *tmp = NULL; 127 struct device_node *child_dn; 128 129 list_for_each_entry(tmp, &parent->devices, bus_list) { 130 child_dn = pci_device_to_OF_node(tmp); 131 if (child_dn == dev_dn) 132 return tmp; 133 } 134 return NULL; 135 } 136 137 static void dlpar_pci_add_bus(struct device_node *dn) 138 { 139 struct pci_dn *pdn = PCI_DN(dn); 140 struct pci_controller *phb = pdn->phb; 141 struct pci_dev *dev = NULL; 142 143 eeh_add_device_tree_early(pdn); 144 145 /* Add EADS device to PHB bus, adding new entry to bus->devices */ 146 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn); 147 if (!dev) { 148 printk(KERN_ERR "%s: failed to create pci dev for %pOF\n", 149 __func__, dn); 150 return; 151 } 152 153 /* Scan below the new bridge */ 154 if (pci_is_bridge(dev)) 155 of_scan_pci_bridge(dev); 156 157 /* Map IO space for child bus, which may or may not succeed */ 158 pcibios_map_io_space(dev->subordinate); 159 160 /* Finish adding it : resource allocation, adding devices, etc... 161 * Note that we need to perform the finish pass on the -parent- 162 * bus of the EADS bridge so the bridge device itself gets 163 * properly added 164 */ 165 pcibios_finish_adding_to_bus(phb->bus); 166 } 167 168 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) 169 { 170 struct pci_dev *dev; 171 struct pci_controller *phb; 172 173 if (pci_find_bus_by_node(dn)) 174 return -EINVAL; 175 176 /* Add pci bus */ 177 dlpar_pci_add_bus(dn); 178 179 /* Confirm new bridge dev was created */ 180 phb = PCI_DN(dn)->phb; 181 dev = dlpar_find_new_dev(phb->bus, dn); 182 183 if (!dev) { 184 printk(KERN_ERR "%s: unable to add bus %s\n", __func__, 185 drc_name); 186 return -EIO; 187 } 188 189 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 190 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n", 191 __func__, dev->hdr_type, drc_name); 192 return -EIO; 193 } 194 195 /* Add hotplug slot */ 196 if (rpaphp_add_slot(dn)) { 197 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 198 __func__, drc_name); 199 return -EIO; 200 } 201 return 0; 202 } 203 204 static int dlpar_remove_phb(char *drc_name, struct device_node *dn) 205 { 206 struct slot *slot; 207 struct pci_dn *pdn; 208 int rc = 0; 209 210 if (!pci_find_bus_by_node(dn)) 211 return -EINVAL; 212 213 /* If pci slot is hotpluggable, use hotplug to remove it */ 214 slot = find_php_slot(dn); 215 if (slot && rpaphp_deregister_slot(slot)) { 216 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n", 217 __func__, drc_name); 218 return -EIO; 219 } 220 221 pdn = dn->data; 222 BUG_ON(!pdn || !pdn->phb); 223 rc = remove_phb_dynamic(pdn->phb); 224 if (rc < 0) 225 return rc; 226 227 pdn->phb = NULL; 228 229 return 0; 230 } 231 232 static int dlpar_add_phb(char *drc_name, struct device_node *dn) 233 { 234 struct pci_controller *phb; 235 236 if (PCI_DN(dn) && PCI_DN(dn)->phb) { 237 /* PHB already exists */ 238 return -EINVAL; 239 } 240 241 phb = init_phb_dynamic(dn); 242 if (!phb) 243 return -EIO; 244 245 if (rpaphp_add_slot(dn)) { 246 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 247 __func__, drc_name); 248 return -EIO; 249 } 250 return 0; 251 } 252 253 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) 254 { 255 struct vio_dev *vio_dev; 256 257 vio_dev = vio_find_node(dn); 258 if (vio_dev) { 259 put_device(&vio_dev->dev); 260 return -EINVAL; 261 } 262 263 if (!vio_register_device_node(dn)) { 264 printk(KERN_ERR 265 "%s: failed to register vio node %s\n", 266 __func__, drc_name); 267 return -EIO; 268 } 269 return 0; 270 } 271 272 /** 273 * dlpar_add_slot - DLPAR add an I/O Slot 274 * @drc_name: drc-name of newly added slot 275 * 276 * Make the hotplug module and the kernel aware of a newly added I/O Slot. 277 * Return Codes: 278 * 0 Success 279 * -ENODEV Not a valid drc_name 280 * -EINVAL Slot already added 281 * -ERESTARTSYS Signalled before obtaining lock 282 * -EIO Internal PCI Error 283 */ 284 int dlpar_add_slot(char *drc_name) 285 { 286 struct device_node *dn = NULL; 287 int node_type; 288 int rc = -EIO; 289 290 if (mutex_lock_interruptible(&rpadlpar_mutex)) 291 return -ERESTARTSYS; 292 293 /* Find newly added node */ 294 dn = find_dlpar_node(drc_name, &node_type); 295 if (!dn) { 296 rc = -ENODEV; 297 goto exit; 298 } 299 300 switch (node_type) { 301 case NODE_TYPE_VIO: 302 rc = dlpar_add_vio_slot(drc_name, dn); 303 break; 304 case NODE_TYPE_SLOT: 305 rc = dlpar_add_pci_slot(drc_name, dn); 306 break; 307 case NODE_TYPE_PHB: 308 rc = dlpar_add_phb(drc_name, dn); 309 break; 310 } 311 of_node_put(dn); 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); 338 339 put_device(&vio_dev->dev); 340 341 return 0; 342 } 343 344 /** 345 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot 346 * @drc_name: drc-name of newly added slot 347 * @dn: &device_node 348 * 349 * Remove the kernel and hotplug representations of a PCI I/O Slot. 350 * Return Codes: 351 * 0 Success 352 * -ENODEV Not a valid drc_name 353 * -EIO Internal PCI Error 354 */ 355 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) 356 { 357 struct pci_bus *bus; 358 struct slot *slot; 359 int ret = 0; 360 361 pci_lock_rescan_remove(); 362 363 bus = pci_find_bus_by_node(dn); 364 if (!bus) { 365 ret = -EINVAL; 366 goto out; 367 } 368 369 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n", 370 bus->self ? pci_name(bus->self) : "<!PHB!>"); 371 372 slot = find_php_slot(dn); 373 if (slot) { 374 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n", 375 pci_domain_nr(bus), bus->number); 376 377 if (rpaphp_deregister_slot(slot)) { 378 printk(KERN_ERR 379 "%s: unable to remove hotplug slot %s\n", 380 __func__, drc_name); 381 ret = -EIO; 382 goto out; 383 } 384 } 385 386 /* Remove all devices below slot */ 387 pci_hp_remove_devices(bus); 388 389 /* Unmap PCI IO space */ 390 if (pcibios_unmap_io_space(bus)) { 391 printk(KERN_ERR "%s: failed to unmap bus range\n", 392 __func__); 393 ret = -ERANGE; 394 goto out; 395 } 396 397 /* Remove the EADS bridge device itself */ 398 BUG_ON(!bus->self); 399 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self)); 400 pci_stop_and_remove_bus_device(bus->self); 401 402 out: 403 pci_unlock_rescan_remove(); 404 return ret; 405 } 406 407 /** 408 * dlpar_remove_slot - DLPAR remove an I/O Slot 409 * @drc_name: drc-name of newly added slot 410 * 411 * Remove the kernel and hotplug representations of an I/O Slot. 412 * Return Codes: 413 * 0 Success 414 * -ENODEV Not a valid drc_name 415 * -EINVAL Slot already removed 416 * -ERESTARTSYS Signalled before obtaining lock 417 * -EIO Internal Error 418 */ 419 int dlpar_remove_slot(char *drc_name) 420 { 421 struct device_node *dn; 422 int node_type; 423 int rc = 0; 424 425 if (mutex_lock_interruptible(&rpadlpar_mutex)) 426 return -ERESTARTSYS; 427 428 dn = find_dlpar_node(drc_name, &node_type); 429 if (!dn) { 430 rc = -ENODEV; 431 goto exit; 432 } 433 434 switch (node_type) { 435 case NODE_TYPE_VIO: 436 rc = dlpar_remove_vio_slot(drc_name, dn); 437 break; 438 case NODE_TYPE_PHB: 439 rc = dlpar_remove_phb(drc_name, dn); 440 break; 441 case NODE_TYPE_SLOT: 442 rc = dlpar_remove_pci_slot(drc_name, dn); 443 break; 444 } 445 of_node_put(dn); 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 } 477 478 module_init(rpadlpar_io_init); 479 module_exit(rpadlpar_io_exit); 480 MODULE_LICENSE("GPL"); 481