1 /* 2 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. 3 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> 4 * 5 * All rights reserved. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or (at 10 * your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 15 * NON INFRINGEMENT. See the GNU General Public License for more 16 * details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * 22 * Send feedback to <lxie@us.ibm.com> 23 * 24 */ 25 #include <linux/pci.h> 26 #include <linux/string.h> 27 28 #include <asm/pci-bridge.h> 29 #include <asm/rtas.h> 30 #include <asm/machdep.h> 31 32 #include "../pci.h" /* for pci_add_new_bus */ 33 #include "rpaphp.h" 34 35 static struct pci_bus *find_bus_among_children(struct pci_bus *bus, 36 struct device_node *dn) 37 { 38 struct pci_bus *child = NULL; 39 struct list_head *tmp; 40 struct device_node *busdn; 41 42 busdn = pci_bus_to_OF_node(bus); 43 if (busdn == dn) 44 return bus; 45 46 list_for_each(tmp, &bus->children) { 47 child = find_bus_among_children(pci_bus_b(tmp), dn); 48 if (child) 49 break; 50 } 51 return child; 52 } 53 54 struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn) 55 { 56 struct pci_dn *pdn = dn->data; 57 58 if (!pdn || !pdn->phb || !pdn->phb->bus) 59 return NULL; 60 61 return find_bus_among_children(pdn->phb->bus, dn); 62 } 63 EXPORT_SYMBOL_GPL(rpaphp_find_pci_bus); 64 65 int rpaphp_claim_resource(struct pci_dev *dev, int resource) 66 { 67 struct resource *res = &dev->resource[resource]; 68 struct resource *root = pci_find_parent_resource(dev, res); 69 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; 70 int err = -EINVAL; 71 72 if (root != NULL) { 73 err = request_resource(root, res); 74 } 75 76 if (err) { 77 err("PCI: %s region %d of %s %s [%lx:%lx]\n", 78 root ? "Address space collision on" : 79 "No parent found for", 80 resource, dtype, pci_name(dev), res->start, res->end); 81 } 82 return err; 83 } 84 85 EXPORT_SYMBOL_GPL(rpaphp_claim_resource); 86 87 static int rpaphp_get_sensor_state(struct slot *slot, int *state) 88 { 89 int rc; 90 int setlevel; 91 92 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state); 93 94 if (rc < 0) { 95 if (rc == -EFAULT || rc == -EEXIST) { 96 dbg("%s: slot must be power up to get sensor-state\n", 97 __FUNCTION__); 98 99 /* some slots have to be powered up 100 * before get-sensor will succeed. 101 */ 102 rc = rtas_set_power_level(slot->power_domain, POWER_ON, 103 &setlevel); 104 if (rc < 0) { 105 dbg("%s: power on slot[%s] failed rc=%d.\n", 106 __FUNCTION__, slot->name, rc); 107 } else { 108 rc = rtas_get_sensor(DR_ENTITY_SENSE, 109 slot->index, state); 110 } 111 } else if (rc == -ENODEV) 112 info("%s: slot is unusable\n", __FUNCTION__); 113 else 114 err("%s failed to get sensor state\n", __FUNCTION__); 115 } 116 return rc; 117 } 118 119 /** 120 * get_pci_adapter_status - get the status of a slot 121 * 122 * 0-- slot is empty 123 * 1-- adapter is configured 124 * 2-- adapter is not configured 125 * 3-- not valid 126 */ 127 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value) 128 { 129 struct pci_bus *bus; 130 int state, rc; 131 132 *value = NOT_VALID; 133 rc = rpaphp_get_sensor_state(slot, &state); 134 if (rc) 135 goto exit; 136 137 if (state == EMPTY) 138 *value = EMPTY; 139 else if (state == PRESENT) { 140 if (!is_init) { 141 /* at run-time slot->state can be changed by */ 142 /* config/unconfig adapter */ 143 *value = slot->state; 144 } else { 145 bus = rpaphp_find_pci_bus(slot->dn); 146 if (bus && !list_empty(&bus->devices)) 147 *value = CONFIGURED; 148 else 149 *value = NOT_CONFIGURED; 150 } 151 } 152 exit: 153 return rc; 154 } 155 156 /* Must be called before pci_bus_add_devices */ 157 void rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus) 158 { 159 struct pci_dev *dev; 160 161 list_for_each_entry(dev, &bus->devices, bus_list) { 162 /* 163 * Skip already-present devices (which are on the 164 * global device list.) 165 */ 166 if (list_empty(&dev->global_list)) { 167 int i; 168 169 /* Need to setup IOMMU tables */ 170 ppc_md.iommu_dev_setup(dev); 171 172 if(fix_bus) 173 pcibios_fixup_device_resources(dev, bus); 174 pci_read_irq_line(dev); 175 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 176 struct resource *r = &dev->resource[i]; 177 178 if (r->parent || !r->start || !r->flags) 179 continue; 180 rpaphp_claim_resource(dev, i); 181 } 182 } 183 } 184 } 185 186 static void rpaphp_eeh_add_bus_device(struct pci_bus *bus) 187 { 188 struct pci_dev *dev; 189 190 list_for_each_entry(dev, &bus->devices, bus_list) { 191 eeh_add_device_late(dev); 192 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 193 struct pci_bus *subbus = dev->subordinate; 194 if (subbus) 195 rpaphp_eeh_add_bus_device (subbus); 196 } 197 } 198 } 199 200 static int rpaphp_pci_config_bridge(struct pci_dev *dev) 201 { 202 u8 sec_busno; 203 struct pci_bus *child_bus; 204 struct pci_dev *child_dev; 205 206 dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev)); 207 208 /* get busno of downstream bus */ 209 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno); 210 211 /* add to children of PCI bridge dev->bus */ 212 child_bus = pci_add_new_bus(dev->bus, dev, sec_busno); 213 if (!child_bus) { 214 err("%s: could not add second bus\n", __FUNCTION__); 215 return -EIO; 216 } 217 sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number); 218 /* do pci_scan_child_bus */ 219 pci_scan_child_bus(child_bus); 220 221 list_for_each_entry(child_dev, &child_bus->devices, bus_list) { 222 eeh_add_device_late(child_dev); 223 } 224 225 /* fixup new pci devices without touching bus struct */ 226 rpaphp_fixup_new_pci_devices(child_bus, 0); 227 228 /* Make the discovered devices available */ 229 pci_bus_add_devices(child_bus); 230 return 0; 231 } 232 233 void rpaphp_init_new_devs(struct pci_bus *bus) 234 { 235 rpaphp_fixup_new_pci_devices(bus, 0); 236 rpaphp_eeh_add_bus_device(bus); 237 } 238 EXPORT_SYMBOL_GPL(rpaphp_init_new_devs); 239 240 /***************************************************************************** 241 rpaphp_pci_config_slot() will configure all devices under the 242 given slot->dn and return the the first pci_dev. 243 *****************************************************************************/ 244 static struct pci_dev * 245 rpaphp_pci_config_slot(struct pci_bus *bus) 246 { 247 struct device_node *dn = pci_bus_to_OF_node(bus); 248 struct pci_dev *dev = NULL; 249 int slotno; 250 int num; 251 252 dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name); 253 if (!dn || !dn->child) 254 return NULL; 255 256 if (_machine == PLATFORM_PSERIES_LPAR) { 257 of_scan_bus(dn, bus); 258 if (list_empty(&bus->devices)) { 259 err("%s: No new device found\n", __FUNCTION__); 260 return NULL; 261 } 262 263 rpaphp_init_new_devs(bus); 264 pci_bus_add_devices(bus); 265 dev = list_entry(&bus->devices, struct pci_dev, bus_list); 266 } else { 267 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); 268 269 /* pci_scan_slot should find all children */ 270 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); 271 if (num) { 272 rpaphp_fixup_new_pci_devices(bus, 1); 273 pci_bus_add_devices(bus); 274 } 275 if (list_empty(&bus->devices)) { 276 err("%s: No new device found\n", __FUNCTION__); 277 return NULL; 278 } 279 list_for_each_entry(dev, &bus->devices, bus_list) { 280 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) 281 rpaphp_pci_config_bridge(dev); 282 283 rpaphp_eeh_add_bus_device(bus); 284 } 285 } 286 287 return dev; 288 } 289 290 void rpaphp_eeh_init_nodes(struct device_node *dn) 291 { 292 struct device_node *sib; 293 294 for (sib = dn->child; sib; sib = sib->sibling) 295 rpaphp_eeh_init_nodes(sib); 296 eeh_add_device_early(dn); 297 return; 298 299 } 300 EXPORT_SYMBOL_GPL(rpaphp_eeh_init_nodes); 301 302 static void print_slot_pci_funcs(struct pci_bus *bus) 303 { 304 struct device_node *dn; 305 struct pci_dev *dev; 306 307 dn = pci_bus_to_OF_node(bus); 308 if (!dn) 309 return; 310 311 dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name); 312 list_for_each_entry (dev, &bus->devices, bus_list) 313 dbg("\t%s\n", pci_name(dev)); 314 return; 315 } 316 317 int rpaphp_config_pci_adapter(struct pci_bus *bus) 318 { 319 struct device_node *dn = pci_bus_to_OF_node(bus); 320 struct pci_dev *dev; 321 int rc = -ENODEV; 322 323 dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name); 324 if (!dn) 325 goto exit; 326 327 rpaphp_eeh_init_nodes(dn); 328 dev = rpaphp_pci_config_slot(bus); 329 if (!dev) { 330 err("%s: can't find any devices.\n", __FUNCTION__); 331 goto exit; 332 } 333 print_slot_pci_funcs(bus); 334 rc = 0; 335 exit: 336 dbg("Exit %s: rc=%d\n", __FUNCTION__, rc); 337 return rc; 338 } 339 EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter); 340 341 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev) 342 { 343 eeh_remove_device(dev); 344 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 345 struct pci_bus *bus = dev->subordinate; 346 struct list_head *ln; 347 if (!bus) 348 return; 349 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) { 350 struct pci_dev *pdev = pci_dev_b(ln); 351 if (pdev) 352 rpaphp_eeh_remove_bus_device(pdev); 353 } 354 355 } 356 return; 357 } 358 359 int rpaphp_unconfig_pci_adapter(struct pci_bus *bus) 360 { 361 struct pci_dev *dev, *tmp; 362 363 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 364 rpaphp_eeh_remove_bus_device(dev); 365 pci_remove_bus_device(dev); 366 } 367 return 0; 368 } 369 EXPORT_SYMBOL_GPL(rpaphp_unconfig_pci_adapter); 370 371 static int setup_pci_hotplug_slot_info(struct slot *slot) 372 { 373 dbg("%s Initilize the PCI slot's hotplug->info structure ...\n", 374 __FUNCTION__); 375 rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status); 376 rpaphp_get_pci_adapter_status(slot, 1, 377 &slot->hotplug_slot->info-> 378 adapter_status); 379 if (slot->hotplug_slot->info->adapter_status == NOT_VALID) { 380 err("%s: NOT_VALID: skip dn->full_name=%s\n", 381 __FUNCTION__, slot->dn->full_name); 382 return -EINVAL; 383 } 384 return 0; 385 } 386 387 static void set_slot_name(struct slot *slot) 388 { 389 struct pci_bus *bus = slot->bus; 390 struct pci_dev *bridge; 391 392 bridge = bus->self; 393 if (bridge) 394 strcpy(slot->name, pci_name(bridge)); 395 else 396 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus), 397 bus->number); 398 } 399 400 static int setup_pci_slot(struct slot *slot) 401 { 402 struct device_node *dn = slot->dn; 403 struct pci_bus *bus; 404 405 BUG_ON(!dn); 406 bus = rpaphp_find_pci_bus(dn); 407 if (!bus) { 408 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name); 409 goto exit_rc; 410 } 411 412 slot->bus = bus; 413 slot->pci_devs = &bus->devices; 414 set_slot_name(slot); 415 416 /* find slot's pci_dev if it's not empty */ 417 if (slot->hotplug_slot->info->adapter_status == EMPTY) { 418 slot->state = EMPTY; /* slot is empty */ 419 } else { 420 /* slot is occupied */ 421 if (!dn->child) { 422 /* non-empty slot has to have child */ 423 err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 424 __FUNCTION__, slot->name); 425 goto exit_rc; 426 } 427 428 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) { 429 dbg("%s CONFIGURING pci adapter in slot[%s]\n", 430 __FUNCTION__, slot->name); 431 if (rpaphp_config_pci_adapter(slot->bus)) { 432 err("%s: CONFIG pci adapter failed\n", __FUNCTION__); 433 goto exit_rc; 434 } 435 436 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) { 437 err("%s: slot[%s]'s adapter_status is NOT_VALID.\n", 438 __FUNCTION__, slot->name); 439 goto exit_rc; 440 } 441 print_slot_pci_funcs(slot->bus); 442 if (!list_empty(slot->pci_devs)) { 443 slot->state = CONFIGURED; 444 } else { 445 /* DLPAR add as opposed to 446 * boot time */ 447 slot->state = NOT_CONFIGURED; 448 } 449 } 450 return 0; 451 exit_rc: 452 dealloc_slot_struct(slot); 453 return -EINVAL; 454 } 455 456 int register_pci_slot(struct slot *slot) 457 { 458 int rc = -EINVAL; 459 460 if (setup_pci_hotplug_slot_info(slot)) 461 goto exit_rc; 462 if (setup_pci_slot(slot)) 463 goto exit_rc; 464 rc = register_slot(slot); 465 exit_rc: 466 return rc; 467 } 468 469 int rpaphp_enable_pci_slot(struct slot *slot) 470 { 471 int retval = 0, state; 472 473 retval = rpaphp_get_sensor_state(slot, &state); 474 if (retval) 475 goto exit; 476 dbg("%s: sensor state[%d]\n", __FUNCTION__, state); 477 /* if slot is not empty, enable the adapter */ 478 if (state == PRESENT) { 479 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name); 480 retval = rpaphp_config_pci_adapter(slot->bus); 481 if (!retval) { 482 slot->state = CONFIGURED; 483 info("%s: devices in slot[%s] configured\n", 484 __FUNCTION__, slot->name); 485 } else { 486 slot->state = NOT_CONFIGURED; 487 dbg("%s: no pci_dev struct for adapter in slot[%s]\n", 488 __FUNCTION__, slot->name); 489 } 490 } else if (state == EMPTY) { 491 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name); 492 slot->state = EMPTY; 493 } else { 494 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, 495 slot->name); 496 slot->state = NOT_VALID; 497 retval = -EINVAL; 498 } 499 exit: 500 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); 501 return retval; 502 } 503