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 55 return dn; 56 } 57 58 /* Find dlpar-capable pci node that contains the specified name and type */ 59 static struct device_node *find_php_slot_pci_node(char *drc_name, 60 char *drc_type) 61 { 62 struct device_node *np = NULL; 63 int rc; 64 65 while ((np = of_find_node_by_name(np, "pci"))) { 66 rc = rpaphp_check_drc_props(np, drc_name, drc_type); 67 if (rc == 0) 68 break; 69 } 70 71 return np; 72 } 73 74 static struct device_node *find_dlpar_node(char *drc_name, int *node_type) 75 { 76 struct device_node *dn; 77 78 dn = find_php_slot_pci_node(drc_name, "SLOT"); 79 if (dn) { 80 *node_type = NODE_TYPE_SLOT; 81 return dn; 82 } 83 84 dn = find_php_slot_pci_node(drc_name, "PHB"); 85 if (dn) { 86 *node_type = NODE_TYPE_PHB; 87 return dn; 88 } 89 90 dn = find_vio_slot_node(drc_name); 91 if (dn) { 92 *node_type = NODE_TYPE_VIO; 93 return dn; 94 } 95 96 return NULL; 97 } 98 99 /** 100 * find_php_slot - return hotplug slot structure for device node 101 * @dn: target &device_node 102 * 103 * This routine will return the hotplug slot structure 104 * for a given device node. Note that built-in PCI slots 105 * may be dlpar-able, but not hot-pluggable, so this routine 106 * will return NULL for built-in PCI slots. 107 */ 108 static struct slot *find_php_slot(struct device_node *dn) 109 { 110 struct slot *slot, *next; 111 112 list_for_each_entry_safe(slot, next, &rpaphp_slot_head, 113 rpaphp_slot_list) { 114 if (slot->dn == dn) 115 return slot; 116 } 117 118 return NULL; 119 } 120 121 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, 122 struct device_node *dev_dn) 123 { 124 struct pci_dev *tmp = NULL; 125 struct device_node *child_dn; 126 127 list_for_each_entry(tmp, &parent->devices, bus_list) { 128 child_dn = pci_device_to_OF_node(tmp); 129 if (child_dn == dev_dn) 130 return tmp; 131 } 132 return NULL; 133 } 134 135 static void dlpar_pci_add_bus(struct device_node *dn) 136 { 137 struct pci_dn *pdn = PCI_DN(dn); 138 struct pci_controller *phb = pdn->phb; 139 struct pci_dev *dev = NULL; 140 141 eeh_add_device_tree_early(pdn); 142 143 /* Add EADS device to PHB bus, adding new entry to bus->devices */ 144 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn); 145 if (!dev) { 146 printk(KERN_ERR "%s: failed to create pci dev for %pOF\n", 147 __func__, dn); 148 return; 149 } 150 151 /* Scan below the new bridge */ 152 if (pci_is_bridge(dev)) 153 of_scan_pci_bridge(dev); 154 155 /* Map IO space for child bus, which may or may not succeed */ 156 pcibios_map_io_space(dev->subordinate); 157 158 /* Finish adding it : resource allocation, adding devices, etc... 159 * Note that we need to perform the finish pass on the -parent- 160 * bus of the EADS bridge so the bridge device itself gets 161 * properly added 162 */ 163 pcibios_finish_adding_to_bus(phb->bus); 164 } 165 166 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) 167 { 168 struct pci_dev *dev; 169 struct pci_controller *phb; 170 171 if (pci_find_bus_by_node(dn)) 172 return -EINVAL; 173 174 /* Add pci bus */ 175 dlpar_pci_add_bus(dn); 176 177 /* Confirm new bridge dev was created */ 178 phb = PCI_DN(dn)->phb; 179 dev = dlpar_find_new_dev(phb->bus, dn); 180 181 if (!dev) { 182 printk(KERN_ERR "%s: unable to add bus %s\n", __func__, 183 drc_name); 184 return -EIO; 185 } 186 187 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 188 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n", 189 __func__, dev->hdr_type, drc_name); 190 return -EIO; 191 } 192 193 /* Add hotplug slot */ 194 if (rpaphp_add_slot(dn)) { 195 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 196 __func__, drc_name); 197 return -EIO; 198 } 199 return 0; 200 } 201 202 static int dlpar_remove_phb(char *drc_name, struct device_node *dn) 203 { 204 struct slot *slot; 205 struct pci_dn *pdn; 206 int rc = 0; 207 208 if (!pci_find_bus_by_node(dn)) 209 return -EINVAL; 210 211 /* If pci slot is hotpluggable, use hotplug to remove it */ 212 slot = find_php_slot(dn); 213 if (slot && rpaphp_deregister_slot(slot)) { 214 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n", 215 __func__, drc_name); 216 return -EIO; 217 } 218 219 pdn = dn->data; 220 BUG_ON(!pdn || !pdn->phb); 221 rc = remove_phb_dynamic(pdn->phb); 222 if (rc < 0) 223 return rc; 224 225 pdn->phb = NULL; 226 227 return 0; 228 } 229 230 static int dlpar_add_phb(char *drc_name, struct device_node *dn) 231 { 232 struct pci_controller *phb; 233 234 if (PCI_DN(dn) && PCI_DN(dn)->phb) { 235 /* PHB already exists */ 236 return -EINVAL; 237 } 238 239 phb = init_phb_dynamic(dn); 240 if (!phb) 241 return -EIO; 242 243 if (rpaphp_add_slot(dn)) { 244 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 245 __func__, drc_name); 246 return -EIO; 247 } 248 return 0; 249 } 250 251 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) 252 { 253 struct vio_dev *vio_dev; 254 255 vio_dev = vio_find_node(dn); 256 if (vio_dev) { 257 put_device(&vio_dev->dev); 258 return -EINVAL; 259 } 260 261 if (!vio_register_device_node(dn)) { 262 printk(KERN_ERR 263 "%s: failed to register vio node %s\n", 264 __func__, drc_name); 265 return -EIO; 266 } 267 return 0; 268 } 269 270 /** 271 * dlpar_add_slot - DLPAR add an I/O Slot 272 * @drc_name: drc-name of newly added slot 273 * 274 * Make the hotplug module and the kernel aware of a newly added I/O Slot. 275 * Return Codes: 276 * 0 Success 277 * -ENODEV Not a valid drc_name 278 * -EINVAL Slot already added 279 * -ERESTARTSYS Signalled before obtaining lock 280 * -EIO Internal PCI Error 281 */ 282 int dlpar_add_slot(char *drc_name) 283 { 284 struct device_node *dn = NULL; 285 int node_type; 286 int rc = -EIO; 287 288 if (mutex_lock_interruptible(&rpadlpar_mutex)) 289 return -ERESTARTSYS; 290 291 /* Find newly added node */ 292 dn = find_dlpar_node(drc_name, &node_type); 293 if (!dn) { 294 rc = -ENODEV; 295 goto exit; 296 } 297 298 switch (node_type) { 299 case NODE_TYPE_VIO: 300 rc = dlpar_add_vio_slot(drc_name, dn); 301 break; 302 case NODE_TYPE_SLOT: 303 rc = dlpar_add_pci_slot(drc_name, dn); 304 break; 305 case NODE_TYPE_PHB: 306 rc = dlpar_add_phb(drc_name, dn); 307 break; 308 } 309 310 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); 311 exit: 312 mutex_unlock(&rpadlpar_mutex); 313 return rc; 314 } 315 316 /** 317 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot 318 * @drc_name: drc-name of newly added slot 319 * @dn: &device_node 320 * 321 * Remove the kernel and hotplug representations of an I/O Slot. 322 * Return Codes: 323 * 0 Success 324 * -EINVAL Vio dev doesn't exist 325 */ 326 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn) 327 { 328 struct vio_dev *vio_dev; 329 330 vio_dev = vio_find_node(dn); 331 if (!vio_dev) 332 return -EINVAL; 333 334 vio_unregister_device(vio_dev); 335 336 put_device(&vio_dev->dev); 337 338 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 = pci_find_bus_by_node(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 pci_hp_remove_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 { 459 460 if (!is_dlpar_capable()) { 461 printk(KERN_WARNING "%s: partition not DLPAR capable\n", 462 __func__); 463 return -EPERM; 464 } 465 466 return dlpar_sysfs_init(); 467 } 468 469 void rpadlpar_io_exit(void) 470 { 471 dlpar_sysfs_exit(); 472 return; 473 } 474 475 module_init(rpadlpar_io_init); 476 module_exit(rpadlpar_io_exit); 477 MODULE_LICENSE("GPL"); 478