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/of.h> 19 #include <linux/pci.h> 20 #include <linux/string.h> 21 #include <linux/vmalloc.h> 22 23 #include <asm/pci-bridge.h> 24 #include <linux/mutex.h> 25 #include <asm/rtas.h> 26 #include <asm/vio.h> 27 #include <linux/firmware.h> 28 29 #include "../pci.h" 30 #include "rpaphp.h" 31 #include "rpadlpar.h" 32 33 static DEFINE_MUTEX(rpadlpar_mutex); 34 35 #define DLPAR_MODULE_NAME "rpadlpar_io" 36 37 #define NODE_TYPE_VIO 1 38 #define NODE_TYPE_SLOT 2 39 #define NODE_TYPE_PHB 3 40 41 static struct device_node *find_vio_slot_node(char *drc_name) 42 { 43 struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); 44 struct device_node *dn; 45 int rc; 46 47 if (!parent) 48 return NULL; 49 50 for_each_child_of_node(parent, dn) { 51 rc = rpaphp_check_drc_props(dn, drc_name, NULL); 52 if (rc == 0) 53 break; 54 } 55 of_node_put(parent); 56 57 return dn; 58 } 59 60 /* Find dlpar-capable pci node that contains the specified name and type */ 61 static struct device_node *find_php_slot_pci_node(char *drc_name, 62 char *drc_type) 63 { 64 struct device_node *np; 65 int rc; 66 67 for_each_node_by_name(np, "pci") { 68 rc = rpaphp_check_drc_props(np, drc_name, drc_type); 69 if (rc == 0) 70 break; 71 } 72 73 return np; 74 } 75 76 /* Returns a device_node with its reference count incremented */ 77 static struct device_node *find_dlpar_node(char *drc_name, int *node_type) 78 { 79 struct device_node *dn; 80 81 dn = find_php_slot_pci_node(drc_name, "SLOT"); 82 if (dn) { 83 *node_type = NODE_TYPE_SLOT; 84 return dn; 85 } 86 87 dn = find_php_slot_pci_node(drc_name, "PHB"); 88 if (dn) { 89 *node_type = NODE_TYPE_PHB; 90 return dn; 91 } 92 93 dn = find_vio_slot_node(drc_name); 94 if (dn) { 95 *node_type = NODE_TYPE_VIO; 96 return dn; 97 } 98 99 return NULL; 100 } 101 102 /** 103 * find_php_slot - return hotplug slot structure for device node 104 * @dn: target &device_node 105 * 106 * This routine will return the hotplug slot structure 107 * for a given device node. Note that built-in PCI slots 108 * may be dlpar-able, but not hot-pluggable, so this routine 109 * will return NULL for built-in PCI slots. 110 */ 111 static struct slot *find_php_slot(struct device_node *dn) 112 { 113 struct slot *slot, *next; 114 115 list_for_each_entry_safe(slot, next, &rpaphp_slot_head, 116 rpaphp_slot_list) { 117 if (slot->dn == dn) 118 return slot; 119 } 120 121 return NULL; 122 } 123 124 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, 125 struct device_node *dev_dn) 126 { 127 struct pci_dev *tmp = NULL; 128 struct device_node *child_dn; 129 130 list_for_each_entry(tmp, &parent->devices, bus_list) { 131 child_dn = pci_device_to_OF_node(tmp); 132 if (child_dn == dev_dn) 133 return tmp; 134 } 135 return NULL; 136 } 137 138 static void dlpar_pci_add_bus(struct device_node *dn) 139 { 140 struct pci_dn *pdn = PCI_DN(dn); 141 struct pci_controller *phb = pdn->phb; 142 struct pci_dev *dev = NULL; 143 144 pseries_eeh_init_edev_recursive(pdn); 145 146 /* Add EADS device to PHB bus, adding new entry to bus->devices */ 147 dev = of_create_pci_dev(dn, phb->bus, pdn->devfn); 148 if (!dev) { 149 printk(KERN_ERR "%s: failed to create pci dev for %pOF\n", 150 __func__, dn); 151 return; 152 } 153 154 /* Scan below the new bridge */ 155 if (pci_is_bridge(dev)) 156 of_scan_pci_bridge(dev); 157 158 /* Map IO space for child bus, which may or may not succeed */ 159 pcibios_map_io_space(dev->subordinate); 160 161 /* Finish adding it : resource allocation, adding devices, etc... 162 * Note that we need to perform the finish pass on the -parent- 163 * bus of the EADS bridge so the bridge device itself gets 164 * properly added 165 */ 166 pcibios_finish_adding_to_bus(phb->bus); 167 } 168 169 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) 170 { 171 struct pci_dev *dev; 172 struct pci_controller *phb; 173 174 if (pci_find_bus_by_node(dn)) 175 return -EINVAL; 176 177 /* Add pci bus */ 178 dlpar_pci_add_bus(dn); 179 180 /* Confirm new bridge dev was created */ 181 phb = PCI_DN(dn)->phb; 182 dev = dlpar_find_new_dev(phb->bus, dn); 183 184 if (!dev) { 185 printk(KERN_ERR "%s: unable to add bus %s\n", __func__, 186 drc_name); 187 return -EIO; 188 } 189 190 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 191 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n", 192 __func__, dev->hdr_type, drc_name); 193 return -EIO; 194 } 195 196 /* Add hotplug slot */ 197 if (rpaphp_add_slot(dn)) { 198 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 199 __func__, drc_name); 200 return -EIO; 201 } 202 return 0; 203 } 204 205 static int dlpar_remove_phb(char *drc_name, struct device_node *dn) 206 { 207 struct slot *slot; 208 struct pci_dn *pdn; 209 int rc = 0; 210 211 if (!pci_find_bus_by_node(dn)) 212 return -EINVAL; 213 214 /* If pci slot is hotpluggable, use hotplug to remove it */ 215 slot = find_php_slot(dn); 216 if (slot && rpaphp_deregister_slot(slot)) { 217 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n", 218 __func__, drc_name); 219 return -EIO; 220 } 221 222 pdn = dn->data; 223 BUG_ON(!pdn || !pdn->phb); 224 rc = remove_phb_dynamic(pdn->phb); 225 if (rc < 0) 226 return rc; 227 228 pdn->phb = NULL; 229 230 return 0; 231 } 232 233 static int dlpar_add_phb(char *drc_name, struct device_node *dn) 234 { 235 struct pci_controller *phb; 236 237 if (PCI_DN(dn) && PCI_DN(dn)->phb) { 238 /* PHB already exists */ 239 return -EINVAL; 240 } 241 242 phb = init_phb_dynamic(dn); 243 if (!phb) 244 return -EIO; 245 246 if (rpaphp_add_slot(dn)) { 247 printk(KERN_ERR "%s: unable to add hotplug slot %s\n", 248 __func__, drc_name); 249 return -EIO; 250 } 251 return 0; 252 } 253 254 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) 255 { 256 struct vio_dev *vio_dev; 257 258 vio_dev = vio_find_node(dn); 259 if (vio_dev) { 260 put_device(&vio_dev->dev); 261 return -EINVAL; 262 } 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 of_node_put(dn); 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 static 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 of_node_put(dn); 447 vm_unmap_aliases(); 448 449 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); 450 exit: 451 mutex_unlock(&rpadlpar_mutex); 452 return rc; 453 } 454 455 static inline int is_dlpar_capable(void) 456 { 457 int rc = rtas_token("ibm,configure-connector"); 458 459 return (int) (rc != RTAS_UNKNOWN_SERVICE); 460 } 461 462 static int __init rpadlpar_io_init(void) 463 { 464 465 if (!is_dlpar_capable()) { 466 printk(KERN_WARNING "%s: partition not DLPAR capable\n", 467 __func__); 468 return -EPERM; 469 } 470 471 return dlpar_sysfs_init(); 472 } 473 474 static void __exit rpadlpar_io_exit(void) 475 { 476 dlpar_sysfs_exit(); 477 } 478 479 module_init(rpadlpar_io_init); 480 module_exit(rpadlpar_io_exit); 481 MODULE_LICENSE("GPL"); 482 MODULE_DESCRIPTION("RPA Dynamic Logical Partitioning driver for I/O slots"); 483