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 "../pci.h"             /* for pci_add_new_bus */
  29
  30 #include "rpaphp.h"
  31
  32 struct pci_dev *rpaphp_find_pci_dev(struct device_node *dn)
  33 {
  34         struct pci_dev *retval_dev = NULL, *dev = NULL;
  35         char bus_id[BUS_ID_SIZE];
  36
  37         sprintf(bus_id, "%04x:%02x:%02x.%d",dn->phb->global_number,
  38                 dn->busno, PCI_SLOT(dn->devfn), PCI_FUNC(dn->devfn));
  39         while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
  40                 if (!strcmp(pci_name(dev), bus_id)) {
  41                         retval_dev = dev;
  42                         break;
  43                 }
  44         }
  45         return retval_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) {
  85                 if (rc == NEED_POWER || rc == PWR_ONLY) {
  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) {
  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 == ERR_SENSE_USE)
 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;
 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                         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 int rpaphp_pci_config_bridge(struct pci_dev *dev);
 187
 188 /*****************************************************************************
 189  rpaphp_pci_config_slot() will  configure all devices under the
 190  given slot->dn and return the the first pci_dev.
 191  *****************************************************************************/
 192 static struct pci_dev *
 193 rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus)
 194 {
 195         struct device_node *eads_first_child = dn->child;
 196         struct pci_dev *dev = NULL;
 197         int num;
 198
 199         dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
 200
 201         if (eads_first_child) {
 202                 /* pci_scan_slot should find all children of EADs */
 203                 num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0));
 204                 if (num) {
 205                         rpaphp_fixup_new_pci_devices(bus, 1);
 206                         pci_bus_add_devices(bus);
 207                 }
 208                 dev = rpaphp_find_pci_dev(eads_first_child);
 209                 if (!dev) {
 210                         err("No new device found\n");
 211                         return NULL;
 212                 }
 213                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 214                         rpaphp_pci_config_bridge(dev);
 215         }
 216         return dev;
 217 }
 218
 219 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
 220 {
 221         u8 sec_busno;
 222         struct pci_bus *child_bus;
 223         struct pci_dev *child_dev;
 224
 225         dbg("Enter %s:  BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
 226
 227         /* get busno of downstream bus */
 228         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
 229
 230         /* add to children of PCI bridge dev->bus */
 231         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
 232         if (!child_bus) {
 233                 err("%s: could not add second bus\n", __FUNCTION__);
 234                 return -EIO;
 235         }
 236         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
 237         /* do pci_scan_child_bus */
 238         pci_scan_child_bus(child_bus);
 239
 240         list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
 241                 eeh_add_device_late(child_dev);
 242         }
 243
 244          /* fixup new pci devices without touching bus struct */
 245         rpaphp_fixup_new_pci_devices(child_bus, 0);
 246
 247         /* Make the discovered devices available */
 248         pci_bus_add_devices(child_bus);
 249         return 0;
 250 }
 251
 252 static void enable_eeh(struct device_node *dn)
 253 {
 254         struct device_node *sib;
 255
 256         for (sib = dn->child; sib; sib = sib->sibling)
 257                 enable_eeh(sib);
 258         eeh_add_device_early(dn);
 259         return;
 260
 261 }
 262
 263 #ifdef DEBUG
 264 static void print_slot_pci_funcs(struct slot *slot)
 265 {
 266         struct list_head *l;
 267
 268         if (slot->dev_type == PCI_DEV) {
 269                 printk("pci_funcs of slot[%s]\n", slot->name);
 270                 if (list_empty(&slot->dev.pci_funcs))
 271                         printk("        pci_funcs is EMPTY\n");
 272
 273                 list_for_each (l, &slot->dev.pci_funcs) {
 274                         struct rpaphp_pci_func *func =
 275                                 list_entry(l, struct rpaphp_pci_func, sibling);
 276                         printk("        FOUND dev=%s\n", pci_name(func->pci_dev));
 277                 }
 278         }
 279         return;
 280 }
 281 #else
 282 static void print_slot_pci_funcs(struct slot *slot)
 283 {
 284         return;
 285 }
 286 #endif
 287
 288 static int init_slot_pci_funcs(struct slot *slot)
 289 {
 290         struct device_node *child;
 291
 292         for (child = slot->dn->child; child != NULL; child = child->sibling) {
 293                 struct pci_dev *pdev = rpaphp_find_pci_dev(child);
 294
 295                 if (pdev) {
 296                         struct rpaphp_pci_func *func;
 297                         func = kmalloc(sizeof(struct rpaphp_pci_func), GFP_KERNEL);
 298                         if (!func)
 299                                 return -ENOMEM;
 300                         memset(func, 0, sizeof(struct rpaphp_pci_func));
 301                         INIT_LIST_HEAD(&func->sibling);
 302                         func->pci_dev = pdev;
 303                         list_add_tail(&func->sibling, &slot->dev.pci_funcs);
 304                         print_slot_pci_funcs(slot);
 305                 } else {
 306                         err("%s: dn=%s has no pci_dev\n",
 307                                 __FUNCTION__, child->full_name);
 308                         return -EIO;
 309                 }
 310         }
 311         return 0;
 312 }
 313
 314 static int rpaphp_config_pci_adapter(struct slot *slot)
 315 {
 316         struct pci_bus *pci_bus;
 317         struct pci_dev *dev;
 318         int rc = -ENODEV;
 319
 320         dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
 321
 322         if (slot->bridge) {
 323
 324                 pci_bus = slot->bridge->subordinate;
 325                 if (!pci_bus) {
 326                         err("%s: can't find bus structure\n", __FUNCTION__);
 327                         goto exit;
 328                 }
 329                 enable_eeh(slot->dn);
 330                 dev = rpaphp_pci_config_slot(slot->dn, pci_bus);
 331                 if (!dev) {
 332                         err("%s: can't find any devices.\n", __FUNCTION__);
 333                         goto exit;
 334                 }
 335                 /* associate corresponding pci_dev */
 336                 rc = init_slot_pci_funcs(slot);
 337                 if (rc)
 338                         goto exit;
 339                 print_slot_pci_funcs(slot);
 340                 if (!list_empty(&slot->dev.pci_funcs))
 341                         rc = 0;
 342         } else {
 343                 /* slot is not enabled */
 344                 err("slot doesn't have pci_dev structure\n");
 345         }
 346 exit:
 347         dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
 348         return rc;
 349 }
 350
 351 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
 352 {
 353         eeh_remove_device(dev);
 354         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 355                 struct pci_bus *bus = dev->subordinate;
 356                 struct list_head *ln;
 357                 if (!bus)
 358                         return;
 359                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 360                         struct pci_dev *pdev = pci_dev_b(ln);
 361                         if (pdev)
 362                                 rpaphp_eeh_remove_bus_device(pdev);
 363                 }
 364
 365         }
 366         return;
 367 }
 368
 369 int rpaphp_unconfig_pci_adapter(struct slot *slot)
 370 {
 371         int retval = 0;
 372         struct list_head *ln, *tmp;
 373
 374         dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
 375         if (list_empty(&slot->dev.pci_funcs)) {
 376                 err("%s: slot[%s] doesn't have any devices.\n", __FUNCTION__,
 377                         slot->name);
 378
 379                 retval = -EINVAL;
 380                 goto exit;
 381         }
 382         /* remove the devices from the pci core */
 383         list_for_each_safe (ln, tmp, &slot->dev.pci_funcs) {
 384                 struct rpaphp_pci_func *func;
 385
 386                 func = list_entry(ln, struct rpaphp_pci_func, sibling);
 387                 if (func->pci_dev) {
 388                         pci_remove_bus_device(func->pci_dev);
 389                         rpaphp_eeh_remove_bus_device(func->pci_dev);
 390                 }
 391                 kfree(func);
 392         }
 393         INIT_LIST_HEAD(&slot->dev.pci_funcs);
 394         slot->state = NOT_CONFIGURED;
 395         info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
 396              slot->name);
 397 exit:
 398         dbg("Exit %s, rc=0x%x\n", __FUNCTION__, retval);
 399         return retval;
 400 }
 401
 402 static int setup_pci_hotplug_slot_info(struct slot *slot)
 403 {
 404         dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
 405             __FUNCTION__);
 406         rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
 407         rpaphp_get_pci_adapter_status(slot, 1,
 408                                       &slot->hotplug_slot->info->
 409                                       adapter_status);
 410         if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
 411                 err("%s: NOT_VALID: skip dn->full_name=%s\n",
 412                     __FUNCTION__, slot->dn->full_name);
 413                 return -1;
 414         }
 415         return 0;
 416 }
 417
 418 static int set_phb_slot_name(struct slot *slot)
 419 {
 420         struct device_node *dn;
 421         struct pci_controller *phb;
 422         struct pci_bus *bus;
 423
 424         dn = slot->dn;
 425         if (!dn) {
 426                 return 1;
 427         }
 428         phb = dn->phb;
 429         if (!phb) {
 430                 return 1;
 431         }
 432         bus = phb->bus;
 433         if (!bus) {
 434                 return 1;
 435         }
 436
 437         sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus),
 438                         bus->number, 0, 0);
 439         return 0;
 440 }
 441
 442 static int setup_pci_slot(struct slot *slot)
 443 {
 444         int rc;
 445
 446         if (slot->type == PHB) {
 447                 rc = set_phb_slot_name(slot);
 448                 if (rc) {
 449                         err("%s: failed to set phb slot name\n", __FUNCTION__);
 450                         goto exit_rc;
 451                 }
 452         } else {
 453                 slot->bridge = rpaphp_find_bridge_pdev(slot);
 454                 if (!slot->bridge) {
 455                         /* slot being added doesn't have pci_dev yet */
 456                         err("%s: no pci_dev for bridge dn %s\n",
 457                                         __FUNCTION__, slot->name);
 458                         goto exit_rc;
 459                 }
 460                 dbg("%s set slot->name to %s\n",  __FUNCTION__,
 461                                 pci_name(slot->bridge));
 462                 strcpy(slot->name, pci_name(slot->bridge));
 463         }
 464
 465         /* find slot's pci_dev if it's not empty */
 466         if (slot->hotplug_slot->info->adapter_status == EMPTY) {
 467                 slot->state = EMPTY;    /* slot is empty */
 468         } else {
 469                 /* slot is occupied */
 470                 if (!(slot->dn->child)) {
 471                         /* non-empty slot has to have child */
 472                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
 473                                 __FUNCTION__, slot->name);
 474                         goto exit_rc;
 475                 }
 476
 477                 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
 478                         dbg("%s CONFIGURING pci adapter in slot[%s]\n",
 479                                 __FUNCTION__, slot->name);
 480                         if (rpaphp_config_pci_adapter(slot)) {
 481                                 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
 482                                 goto exit_rc;
 483                         }
 484                 } else if (slot->hotplug_slot->info->adapter_status == CONFIGURED) {
 485                         if (init_slot_pci_funcs(slot)) {
 486                                 err("%s: init_slot_pci_funcs failed\n", __FUNCTION__);
 487                                 goto exit_rc;
 488                         }
 489
 490                 } else {
 491                         err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
 492                                 __FUNCTION__, slot->name);
 493                         goto exit_rc;
 494                 }
 495
 496                 print_slot_pci_funcs(slot);
 497                 if (!list_empty(&slot->dev.pci_funcs)) {
 498                         slot->state = CONFIGURED;
 499
 500                 } else {
 501                         /* DLPAR add as opposed to
 502                          * boot time */
 503                         slot->state = NOT_CONFIGURED;
 504                 }
 505         }
 506         return 0;
 507 exit_rc:
 508         dealloc_slot_struct(slot);
 509         return 1;
 510 }
 511
 512 int register_pci_slot(struct slot *slot)
 513 {
 514         int rc = 1;
 515
 516         slot->dev_type = PCI_DEV;
 517         if ((slot->type == EMBEDDED) || (slot->type == PHB))
 518                 slot->removable = 0;
 519         else
 520                 slot->removable = 1;
 521         INIT_LIST_HEAD(&slot->dev.pci_funcs);
 522         if (setup_pci_hotplug_slot_info(slot))
 523                 goto exit_rc;
 524         if (setup_pci_slot(slot))
 525                 goto exit_rc;
 526         rc = register_slot(slot);
 527 exit_rc:
 528         return rc;
 529 }
 530
 531 int rpaphp_enable_pci_slot(struct slot *slot)
 532 {
 533         int retval = 0, state;
 534
 535         retval = rpaphp_get_sensor_state(slot, &state);
 536         if (retval)
 537                 goto exit;
 538         dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
 539         /* if slot is not empty, enable the adapter */
 540         if (state == PRESENT) {
 541                 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
 542                 retval = rpaphp_config_pci_adapter(slot);
 543                 if (!retval) {
 544                         slot->state = CONFIGURED;
 545                         dbg("%s: PCI devices in slot[%s] has been configured\n",
 546                                 __FUNCTION__, slot->name);
 547                 } else {
 548                         slot->state = NOT_CONFIGURED;
 549                         dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
 550                             __FUNCTION__, slot->name);
 551                 }
 552         } else if (state == EMPTY) {
 553                 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
 554                 slot->state = EMPTY;
 555         } else {
 556                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
 557                     slot->name);
 558                 slot->state = NOT_VALID;
 559                 retval = -EINVAL;
 560         }
 561 exit:
 562         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 563         return retval;
 564 }
 565
 566 struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev)
 567 {
 568         struct list_head        *tmp, *n;
 569         struct slot             *slot;
 570
 571         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 572                 struct pci_bus *bus;
 573                 struct list_head *ln;
 574
 575                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 576                 if (slot->bridge == NULL) {
 577                         if (slot->dev_type == PCI_DEV) {
 578                                 printk(KERN_WARNING "PCI slot missing bridge %s %s \n",
 579                                                     slot->name, slot->location);
 580                         }
 581                         continue;
 582                 }
 583
 584                 bus = slot->bridge->subordinate;
 585                 if (!bus) {
 586                         continue;  /* should never happen? */
 587                 }
 588                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 589                                 struct pci_dev *pdev = pci_dev_b(ln);
 590                                 if (pdev == dev)
 591                                         return slot->hotplug_slot;
 592                 }
 593         }
 594
 595         return NULL;
 596 }
 597
 598 EXPORT_SYMBOL_GPL(rpaphp_find_hotplug_slot);