drivers/pci/hotplug/rpaphp_pci.c

   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 <asm/pci-bridge.h>
  27 #include <asm/rtas.h>
  28 #include <asm/machdep.h>
  29 #include "../pci.h"             /* for pci_add_new_bus */
  30
  31 #include "rpaphp.h"
  32
  33 struct pci_dev *rpaphp_find_pci_dev(struct device_node *dn)
  34 {
  35         struct pci_dev *dev = NULL;
  36         char bus_id[BUS_ID_SIZE];
  37
  38         sprintf(bus_id, "%04x:%02x:%02x.%d", dn->phb->global_number,
  39                 dn->busno, PCI_SLOT(dn->devfn), PCI_FUNC(dn->devfn));
  40         for_each_pci_dev(dev) {
  41                 if (!strcmp(pci_name(dev), bus_id)) {
  42                         break;
  43                 }
  44         }
  45         return dev;
  46 }
  47
  48 EXPORT_SYMBOL_GPL(rpaphp_find_pci_dev);
  49
  50 int rpaphp_claim_resource(struct pci_dev *dev, int resource)
  51 {
  52         struct resource *res = &dev->resource[resource];
  53         struct resource *root = pci_find_parent_resource(dev, res);
  54         char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
  55         int err = -EINVAL;
  56
  57         if (root != NULL) {
  58                 err = request_resource(root, res);
  59         }
  60
  61         if (err) {
  62                 err("PCI: %s region %d of %s %s [%lx:%lx]\n",
  63                     root ? "Address space collision on" :
  64                     "No parent found for",
  65                     resource, dtype, pci_name(dev), res->start, res->end);
  66         }
  67         return err;
  68 }
  69
  70 EXPORT_SYMBOL_GPL(rpaphp_claim_resource);
  71
  72 static struct pci_dev *rpaphp_find_bridge_pdev(struct slot *slot)
  73 {
  74         return rpaphp_find_pci_dev(slot->dn);
  75 }
  76
  77 static int rpaphp_get_sensor_state(struct slot *slot, int *state)
  78 {
  79         int rc;
  80         int setlevel;
  81
  82         rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
  83
  84         if (rc < 0) {
  85                 if (rc == -EFAULT || rc == -EEXIST) {
  86                         dbg("%s: slot must be power up to get sensor-state\n",
  87                             __FUNCTION__);
  88
  89                         /* some slots have to be powered up
  90                          * before get-sensor will succeed.
  91                          */
  92                         rc = rtas_set_power_level(slot->power_domain, POWER_ON,
  93                                                   &setlevel);
  94                         if (rc < 0) {
  95                                 dbg("%s: power on slot[%s] failed rc=%d.\n",
  96                                     __FUNCTION__, slot->name, rc);
  97                         } else {
  98                                 rc = rtas_get_sensor(DR_ENTITY_SENSE,
  99                                                      slot->index, state);
 100                         }
 101                 } else if (rc == -ENODEV)
 102                         info("%s: slot is unusable\n", __FUNCTION__);
 103                 else
 104                         err("%s failed to get sensor state\n", __FUNCTION__);
 105         }
 106         return rc;
 107 }
 108
 109 /**
 110  * get_pci_adapter_status - get the status of a slot
 111  *
 112  * 0-- slot is empty
 113  * 1-- adapter is configured
 114  * 2-- adapter is not configured
 115  * 3-- not valid
 116  */
 117 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
 118 {
 119         int state, rc;
 120         struct device_node *child_dn;
 121         struct pci_dev *child_dev = NULL;
 122
 123         *value = NOT_VALID;
 124         rc = rpaphp_get_sensor_state(slot, &state);
 125         if (rc)
 126                 goto exit;
 127
 128         if ((state == EMPTY) || (slot->type == PHB)) {
 129                 dbg("slot is empty\n");
 130                 *value = EMPTY;
 131         }
 132         else if (state == PRESENT) {
 133                 if (!is_init) {
 134                         /* at run-time slot->state can be changed by */
 135                         /* config/unconfig adapter */
 136                         *value = slot->state;
 137                 } else {
 138                         child_dn = slot->dn->child;
 139                         if (child_dn)
 140                                 child_dev = rpaphp_find_pci_dev(child_dn);
 141
 142                         if (child_dev)
 143                                 *value = CONFIGURED;
 144                         else if (!child_dn)
 145                                 dbg("%s: %s is not valid OFDT node\n",
 146                                     __FUNCTION__, slot->dn->full_name);
 147                         else {
 148                                 err("%s: can't find pdev of adapter in slot[%s]\n",
 149                                         __FUNCTION__, slot->dn->full_name);
 150                                 *value = NOT_CONFIGURED;
 151                         }
 152                 }
 153         }
 154 exit:
 155         return rc;
 156 }
 157
 158 /* Must be called before pci_bus_add_devices */
 159 static void
 160 rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
 161 {
 162         struct pci_dev *dev;
 163
 164         list_for_each_entry(dev, &bus->devices, bus_list) {
 165                 /*
 166                  * Skip already-present devices (which are on the
 167                  * global device list.)
 168                  */
 169                 if (list_empty(&dev->global_list)) {
 170                         int i;
 171
 172                         /* Need to setup IOMMU tables */
 173                         ppc_md.iommu_dev_setup(dev);
 174
 175                         if(fix_bus)
 176                                 pcibios_fixup_device_resources(dev, bus);
 177                         pci_read_irq_line(dev);
 178                         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 179                                 struct resource *r = &dev->resource[i];
 180
 181                                 if (r->parent || !r->start || !r->flags)
 182                                         continue;
 183                                 rpaphp_claim_resource(dev, i);
 184                         }
 185                 }
 186         }
 187 }
 188
 189 static int rpaphp_pci_config_bridge(struct pci_dev *dev);
 190
 191 /*****************************************************************************
 192  rpaphp_pci_config_slot() will  configure all devices under the
 193  given slot->dn and return the the first pci_dev.
 194  *****************************************************************************/
 195 static struct pci_dev *
 196 rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus)
 197 {
 198         struct device_node *eads_first_child = dn->child;
 199         struct pci_dev *dev = NULL;
 200         int num;
 201
 202         dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
 203
 204         if (eads_first_child) {
 205                 /* pci_scan_slot should find all children of EADs */
 206                 num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0));
 207                 if (num) {
 208                         rpaphp_fixup_new_pci_devices(bus, 1);
 209                         pci_bus_add_devices(bus);
 210                 }
 211                 dev = rpaphp_find_pci_dev(eads_first_child);
 212                 if (!dev) {
 213                         err("No new device found\n");
 214                         return NULL;
 215                 }
 216                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 217                         rpaphp_pci_config_bridge(dev);
 218         }
 219         return dev;
 220 }
 221
 222 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
 223 {
 224         u8 sec_busno;
 225         struct pci_bus *child_bus;
 226         struct pci_dev *child_dev;
 227
 228         dbg("Enter %s:  BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
 229
 230         /* get busno of downstream bus */
 231         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
 232
 233         /* add to children of PCI bridge dev->bus */
 234         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
 235         if (!child_bus) {
 236                 err("%s: could not add second bus\n", __FUNCTION__);
 237                 return -EIO;
 238         }
 239         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
 240         /* do pci_scan_child_bus */
 241         pci_scan_child_bus(child_bus);
 242
 243         list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
 244                 eeh_add_device_late(child_dev);
 245         }
 246
 247          /* fixup new pci devices without touching bus struct */
 248         rpaphp_fixup_new_pci_devices(child_bus, 0);
 249
 250         /* Make the discovered devices available */
 251         pci_bus_add_devices(child_bus);
 252         return 0;
 253 }
 254
 255 static void enable_eeh(struct device_node *dn)
 256 {
 257         struct device_node *sib;
 258
 259         for (sib = dn->child; sib; sib = sib->sibling)
 260                 enable_eeh(sib);
 261         eeh_add_device_early(dn);
 262         return;
 263
 264 }
 265
 266 static void print_slot_pci_funcs(struct slot *slot)
 267 {
 268         struct pci_dev *dev;
 269
 270         if (slot->dev_type == PCI_DEV) {
 271                 dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, slot->name);
 272                 list_for_each_entry (dev, slot->dev.pci_devs, bus_list)
 273                         dbg("\t%s\n", pci_name(dev));
 274         }
 275         return;
 276 }
 277
 278 static int rpaphp_config_pci_adapter(struct slot *slot)
 279 {
 280         struct pci_bus *pci_bus;
 281         struct pci_dev *dev;
 282         int rc = -ENODEV;
 283
 284         dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
 285
 286         if (slot->bridge) {
 287
 288                 pci_bus = slot->bridge->subordinate;
 289                 if (!pci_bus) {
 290                         err("%s: can't find bus structure\n", __FUNCTION__);
 291                         goto exit;
 292                 }
 293                 enable_eeh(slot->dn);
 294                 dev = rpaphp_pci_config_slot(slot->dn, pci_bus);
 295                 if (!dev) {
 296                         err("%s: can't find any devices.\n", __FUNCTION__);
 297                         goto exit;
 298                 }
 299                 print_slot_pci_funcs(slot);
 300                 rc = 0;
 301         } else {
 302                 /* slot is not enabled */
 303                 err("slot doesn't have pci_dev structure\n");
 304         }
 305 exit:
 306         dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
 307         return rc;
 308 }
 309
 310 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
 311 {
 312         eeh_remove_device(dev);
 313         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 314                 struct pci_bus *bus = dev->subordinate;
 315                 struct list_head *ln;
 316                 if (!bus)
 317                         return;
 318                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 319                         struct pci_dev *pdev = pci_dev_b(ln);
 320                         if (pdev)
 321                                 rpaphp_eeh_remove_bus_device(pdev);
 322                 }
 323
 324         }
 325         return;
 326 }
 327
 328 int rpaphp_unconfig_pci_adapter(struct slot *slot)
 329 {
 330         struct pci_dev *dev;
 331         int retval = 0;
 332
 333         list_for_each_entry(dev, slot->dev.pci_devs, bus_list)
 334                 rpaphp_eeh_remove_bus_device(dev);
 335
 336         pci_remove_behind_bridge(slot->bridge);
 337         slot->state = NOT_CONFIGURED;
 338         info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
 339              slot->name);
 340         return retval;
 341 }
 342
 343 static int setup_pci_hotplug_slot_info(struct slot *slot)
 344 {
 345         dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
 346             __FUNCTION__);
 347         rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
 348         rpaphp_get_pci_adapter_status(slot, 1,
 349                                       &slot->hotplug_slot->info->
 350                                       adapter_status);
 351         if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
 352                 err("%s: NOT_VALID: skip dn->full_name=%s\n",
 353                     __FUNCTION__, slot->dn->full_name);
 354                 return -EINVAL;
 355         }
 356         return 0;
 357 }
 358
 359 static int set_phb_slot_name(struct slot *slot)
 360 {
 361         struct device_node *dn;
 362         struct pci_controller *phb;
 363         struct pci_bus *bus;
 364
 365         dn = slot->dn;
 366         if (!dn) {
 367                 return -EINVAL;
 368         }
 369         phb = dn->phb;
 370         if (!phb) {
 371                 return -EINVAL;
 372         }
 373         bus = phb->bus;
 374         if (!bus) {
 375                 return -EINVAL;
 376         }
 377
 378         sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus),
 379                         bus->number, 0, 0);
 380         return 0;
 381 }
 382
 383 static int setup_pci_slot(struct slot *slot)
 384 {
 385         struct pci_bus *bus;
 386         int rc;
 387
 388         if (slot->type == PHB) {
 389                 rc = set_phb_slot_name(slot);
 390                 if (rc < 0) {
 391                         err("%s: failed to set phb slot name\n", __FUNCTION__);
 392                         goto exit_rc;
 393                 }
 394         } else {
 395                 slot->bridge = rpaphp_find_bridge_pdev(slot);
 396                 if (!slot->bridge) {
 397                         /* slot being added doesn't have pci_dev yet */
 398                         err("%s: no pci_dev for bridge dn %s\n",
 399                                         __FUNCTION__, slot->name);
 400                         goto exit_rc;
 401                 }
 402
 403                 bus = slot->bridge->subordinate;
 404                 if (!bus)
 405                         goto exit_rc;
 406                 slot->dev.pci_devs = &bus->devices;
 407
 408                 dbg("%s set slot->name to %s\n",  __FUNCTION__,
 409                                 pci_name(slot->bridge));
 410                 strcpy(slot->name, pci_name(slot->bridge));
 411         }
 412
 413         /* find slot's pci_dev if it's not empty */
 414         if (slot->hotplug_slot->info->adapter_status == EMPTY) {
 415                 slot->state = EMPTY;    /* slot is empty */
 416         } else {
 417                 /* slot is occupied */
 418                 if (!(slot->dn->child)) {
 419                         /* non-empty slot has to have child */
 420                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
 421                                 __FUNCTION__, slot->name);
 422                         goto exit_rc;
 423                 }
 424
 425                 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
 426                         dbg("%s CONFIGURING pci adapter in slot[%s]\n",
 427                                 __FUNCTION__, slot->name);
 428                         if (rpaphp_config_pci_adapter(slot)) {
 429                                 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
 430                                 goto exit_rc;
 431                         }
 432
 433                 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
 434                         err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
 435                                 __FUNCTION__, slot->name);
 436                         goto exit_rc;
 437                 }
 438                 print_slot_pci_funcs(slot);
 439                 if (!list_empty(slot->dev.pci_devs)) {
 440                         slot->state = CONFIGURED;
 441                 } else {
 442                         /* DLPAR add as opposed to
 443                          * boot time */
 444                         slot->state = NOT_CONFIGURED;
 445                 }
 446         }
 447         return 0;
 448 exit_rc:
 449         dealloc_slot_struct(slot);
 450         return -EINVAL;
 451 }
 452
 453 int register_pci_slot(struct slot *slot)
 454 {
 455         int rc = -EINVAL;
 456
 457         slot->dev_type = PCI_DEV;
 458         if ((slot->type == EMBEDDED) || (slot->type == PHB))
 459                 slot->removable = 0;
 460         else
 461                 slot->removable = 1;
 462         if (setup_pci_hotplug_slot_info(slot))
 463                 goto exit_rc;
 464         if (setup_pci_slot(slot))
 465                 goto exit_rc;
 466         rc = register_slot(slot);
 467 exit_rc:
 468         return rc;
 469 }
 470
 471 int rpaphp_enable_pci_slot(struct slot *slot)
 472 {
 473         int retval = 0, state;
 474
 475         retval = rpaphp_get_sensor_state(slot, &state);
 476         if (retval)
 477                 goto exit;
 478         dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
 479         /* if slot is not empty, enable the adapter */
 480         if (state == PRESENT) {
 481                 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
 482                 retval = rpaphp_config_pci_adapter(slot);
 483                 if (!retval) {
 484                         slot->state = CONFIGURED;
 485                         dbg("%s: PCI devices in slot[%s] has been configured\n",
 486                                 __FUNCTION__, slot->name);
 487                 } else {
 488                         slot->state = NOT_CONFIGURED;
 489                         dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
 490                             __FUNCTION__, slot->name);
 491                 }
 492         } else if (state == EMPTY) {
 493                 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
 494                 slot->state = EMPTY;
 495         } else {
 496                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
 497                     slot->name);
 498                 slot->state = NOT_VALID;
 499                 retval = -EINVAL;
 500         }
 501 exit:
 502         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 503         return retval;
 504 }
 505
 506 struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev)
 507 {
 508         struct list_head        *tmp, *n;
 509         struct slot             *slot;
 510
 511         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 512                 struct pci_bus *bus;
 513                 struct list_head *ln;
 514
 515                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 516                 if (slot->bridge == NULL) {
 517                         if (slot->dev_type == PCI_DEV) {
 518                                 printk(KERN_WARNING "PCI slot missing bridge %s %s \n",
 519                                                     slot->name, slot->location);
 520                         }
 521                         continue;
 522                 }
 523
 524                 bus = slot->bridge->subordinate;
 525                 if (!bus) {
 526                         continue;  /* should never happen? */
 527                 }
 528                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 529                                 struct pci_dev *pdev = pci_dev_b(ln);
 530                                 if (pdev == dev)
 531                                         return slot->hotplug_slot;
 532                 }
 533         }
 534
 535         return NULL;
 536 }
 537
 538 EXPORT_SYMBOL_GPL(rpaphp_find_hotplug_slot);