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 *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         for_each_pci_dev(dev) {
  40                 if (!strcmp(pci_name(dev), bus_id)) {
  41                         break;
  42                 }
  43         }
  44         return dev;
  45 }
  46
  47 EXPORT_SYMBOL_GPL(rpaphp_find_pci_dev);
  48
  49 int rpaphp_claim_resource(struct pci_dev *dev, int resource)
  50 {
  51         struct resource *res = &dev->resource[resource];
  52         struct resource *root = pci_find_parent_resource(dev, res);
  53         char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
  54         int err = -EINVAL;
  55
  56         if (root != NULL) {
  57                 err = request_resource(root, res);
  58         }
  59
  60         if (err) {
  61                 err("PCI: %s region %d of %s %s [%lx:%lx]\n",
  62                     root ? "Address space collision on" :
  63                     "No parent found for",
  64                     resource, dtype, pci_name(dev), res->start, res->end);
  65         }
  66         return err;
  67 }
  68
  69 EXPORT_SYMBOL_GPL(rpaphp_claim_resource);
  70
  71 static struct pci_dev *rpaphp_find_bridge_pdev(struct slot *slot)
  72 {
  73         return rpaphp_find_pci_dev(slot->dn);
  74 }
  75
  76 static int rpaphp_get_sensor_state(struct slot *slot, int *state)
  77 {
  78         int rc;
  79         int setlevel;
  80
  81         rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
  82
  83         if (rc) {
  84                 if (rc == NEED_POWER || rc == PWR_ONLY) {
  85                         dbg("%s: slot must be power up to get sensor-state\n",
  86                             __FUNCTION__);
  87
  88                         /* some slots have to be powered up
  89                          * before get-sensor will succeed.
  90                          */
  91                         rc = rtas_set_power_level(slot->power_domain, POWER_ON,
  92                                                   &setlevel);
  93                         if (rc) {
  94                                 dbg("%s: power on slot[%s] failed rc=%d.\n",
  95                                     __FUNCTION__, slot->name, rc);
  96                         } else {
  97                                 rc = rtas_get_sensor(DR_ENTITY_SENSE,
  98                                                      slot->index, state);
  99                         }
 100                 } else if (rc == ERR_SENSE_USE)
 101                         info("%s: slot is unusable\n", __FUNCTION__);
 102                 else
 103                         err("%s failed to get sensor state\n", __FUNCTION__);
 104         }
 105         return rc;
 106 }
 107
 108 /**
 109  * get_pci_adapter_status - get the status of a slot
 110  *
 111  * 0-- slot is empty
 112  * 1-- adapter is configured
 113  * 2-- adapter is not configured
 114  * 3-- not valid
 115  */
 116 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
 117 {
 118         int state, rc;
 119         struct device_node *child_dn;
 120         struct pci_dev *child_dev = NULL;
 121
 122         *value = NOT_VALID;
 123         rc = rpaphp_get_sensor_state(slot, &state);
 124         if (rc)
 125                 goto exit;
 126
 127         if ((state == EMPTY) || (slot->type == PHB)) {
 128                 dbg("slot is empty\n");
 129                 *value = EMPTY;
 130         }
 131         else if (state == PRESENT) {
 132                 if (!is_init)
 133                         /* at run-time slot->state can be changed by */
 134                         /* config/unconfig adapter */
 135                         *value = slot->state;
 136                 else {
 137                         child_dn = slot->dn->child;
 138                         if (child_dn)
 139                                 child_dev = rpaphp_find_pci_dev(child_dn);
 140
 141                         if (child_dev)
 142                                 *value = CONFIGURED;
 143                         else if (!child_dn)
 144                                 dbg("%s: %s is not valid OFDT node\n",
 145                                     __FUNCTION__, slot->dn->full_name);
 146                         else {
 147                                 err("%s: can't find pdev of adapter in slot[%s]\n",
 148                                         __FUNCTION__, slot->dn->full_name);
 149                                 *value = NOT_CONFIGURED;
 150                         }
 151                 }
 152         }
 153 exit:
 154         return rc;
 155 }
 156
 157 /* Must be called before pci_bus_add_devices */
 158 static void
 159 rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
 160 {
 161         struct pci_dev *dev;
 162
 163         list_for_each_entry(dev, &bus->devices, bus_list) {
 164                 /*
 165                  * Skip already-present devices (which are on the
 166                  * global device list.)
 167                  */
 168                 if (list_empty(&dev->global_list)) {
 169                         int i;
 170
 171                         if(fix_bus)
 172                                 pcibios_fixup_device_resources(dev, bus);
 173                         pci_read_irq_line(dev);
 174                         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 175                                 struct resource *r = &dev->resource[i];
 176
 177                                 if (r->parent || !r->start || !r->flags)
 178                                         continue;
 179                                 rpaphp_claim_resource(dev, i);
 180                         }
 181                 }
 182         }
 183 }
 184
 185 static int rpaphp_pci_config_bridge(struct pci_dev *dev);
 186
 187 /*****************************************************************************
 188  rpaphp_pci_config_slot() will  configure all devices under the
 189  given slot->dn and return the the first pci_dev.
 190  *****************************************************************************/
 191 static struct pci_dev *
 192 rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus)
 193 {
 194         struct device_node *eads_first_child = dn->child;
 195         struct pci_dev *dev = NULL;
 196         int num;
 197
 198         dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
 199
 200         if (eads_first_child) {
 201                 /* pci_scan_slot should find all children of EADs */
 202                 num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0));
 203                 if (num) {
 204                         rpaphp_fixup_new_pci_devices(bus, 1);
 205                         pci_bus_add_devices(bus);
 206                 }
 207                 dev = rpaphp_find_pci_dev(eads_first_child);
 208                 if (!dev) {
 209                         err("No new device found\n");
 210                         return NULL;
 211                 }
 212                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 213                         rpaphp_pci_config_bridge(dev);
 214         }
 215         return dev;
 216 }
 217
 218 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
 219 {
 220         u8 sec_busno;
 221         struct pci_bus *child_bus;
 222         struct pci_dev *child_dev;
 223
 224         dbg("Enter %s:  BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
 225
 226         /* get busno of downstream bus */
 227         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
 228
 229         /* add to children of PCI bridge dev->bus */
 230         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
 231         if (!child_bus) {
 232                 err("%s: could not add second bus\n", __FUNCTION__);
 233                 return -EIO;
 234         }
 235         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
 236         /* do pci_scan_child_bus */
 237         pci_scan_child_bus(child_bus);
 238
 239         list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
 240                 eeh_add_device_late(child_dev);
 241         }
 242
 243          /* fixup new pci devices without touching bus struct */
 244         rpaphp_fixup_new_pci_devices(child_bus, 0);
 245
 246         /* Make the discovered devices available */
 247         pci_bus_add_devices(child_bus);
 248         return 0;
 249 }
 250
 251 static void enable_eeh(struct device_node *dn)
 252 {
 253         struct device_node *sib;
 254
 255         for (sib = dn->child; sib; sib = sib->sibling)
 256                 enable_eeh(sib);
 257         eeh_add_device_early(dn);
 258         return;
 259
 260 }
 261
 262 #ifdef DEBUG
 263 static void print_slot_pci_funcs(struct slot *slot)
 264 {
 265         struct list_head *l;
 266
 267         if (slot->dev_type == PCI_DEV) {
 268                 printk("pci_funcs of slot[%s]\n", slot->name);
 269                 if (list_empty(&slot->dev.pci_funcs))
 270                         printk("        pci_funcs is EMPTY\n");
 271
 272                 list_for_each (l, &slot->dev.pci_funcs) {
 273                         struct rpaphp_pci_func *func =
 274                                 list_entry(l, struct rpaphp_pci_func, sibling);
 275                         printk("        FOUND dev=%s\n", pci_name(func->pci_dev));
 276                 }
 277         }
 278         return;
 279 }
 280 #else
 281 static void print_slot_pci_funcs(struct slot *slot)
 282 {
 283         return;
 284 }
 285 #endif
 286
 287 static int init_slot_pci_funcs(struct slot *slot)
 288 {
 289         struct device_node *child;
 290
 291         for (child = slot->dn->child; child != NULL; child = child->sibling) {
 292                 struct pci_dev *pdev = rpaphp_find_pci_dev(child);
 293
 294                 if (pdev) {
 295                         struct rpaphp_pci_func *func;
 296                         func = kmalloc(sizeof(struct rpaphp_pci_func), GFP_KERNEL);
 297                         if (!func)
 298                                 return -ENOMEM;
 299                         memset(func, 0, sizeof(struct rpaphp_pci_func));
 300                         INIT_LIST_HEAD(&func->sibling);
 301                         func->pci_dev = pdev;
 302                         list_add_tail(&func->sibling, &slot->dev.pci_funcs);
 303                         print_slot_pci_funcs(slot);
 304                 } else {
 305                         err("%s: dn=%s has no pci_dev\n",
 306                                 __FUNCTION__, child->full_name);
 307                         return -EIO;
 308                 }
 309         }
 310         return 0;
 311 }
 312
 313 static int rpaphp_config_pci_adapter(struct slot *slot)
 314 {
 315         struct pci_bus *pci_bus;
 316         struct pci_dev *dev;
 317         int rc = -ENODEV;
 318
 319         dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
 320
 321         if (slot->bridge) {
 322
 323                 pci_bus = slot->bridge->subordinate;
 324                 if (!pci_bus) {
 325                         err("%s: can't find bus structure\n", __FUNCTION__);
 326                         goto exit;
 327                 }
 328                 enable_eeh(slot->dn);
 329                 dev = rpaphp_pci_config_slot(slot->dn, pci_bus);
 330                 if (!dev) {
 331                         err("%s: can't find any devices.\n", __FUNCTION__);
 332                         goto exit;
 333                 }
 334                 /* associate corresponding pci_dev */
 335                 rc = init_slot_pci_funcs(slot);
 336                 if (rc)
 337                         goto exit;
 338                 print_slot_pci_funcs(slot);
 339                 if (!list_empty(&slot->dev.pci_funcs))
 340                         rc = 0;
 341         } else {
 342                 /* slot is not enabled */
 343                 err("slot doesn't have pci_dev structure\n");
 344         }
 345 exit:
 346         dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
 347         return rc;
 348 }
 349
 350 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
 351 {
 352         eeh_remove_device(dev);
 353         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 354                 struct pci_bus *bus = dev->subordinate;
 355                 struct list_head *ln;
 356                 if (!bus)
 357                         return;
 358                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 359                         struct pci_dev *pdev = pci_dev_b(ln);
 360                         if (pdev)
 361                                 rpaphp_eeh_remove_bus_device(pdev);
 362                 }
 363
 364         }
 365         return;
 366 }
 367
 368 int rpaphp_unconfig_pci_adapter(struct slot *slot)
 369 {
 370         int retval = 0;
 371         struct list_head *ln, *tmp;
 372
 373         dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
 374         if (list_empty(&slot->dev.pci_funcs)) {
 375                 err("%s: slot[%s] doesn't have any devices.\n", __FUNCTION__,
 376                         slot->name);
 377
 378                 retval = -EINVAL;
 379                 goto exit;
 380         }
 381         /* remove the devices from the pci core */
 382         list_for_each_safe (ln, tmp, &slot->dev.pci_funcs) {
 383                 struct rpaphp_pci_func *func;
 384
 385                 func = list_entry(ln, struct rpaphp_pci_func, sibling);
 386                 if (func->pci_dev) {
 387                         pci_remove_bus_device(func->pci_dev);
 388                         rpaphp_eeh_remove_bus_device(func->pci_dev);
 389                 }
 390                 kfree(func);
 391         }
 392         INIT_LIST_HEAD(&slot->dev.pci_funcs);
 393         slot->state = NOT_CONFIGURED;
 394         info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
 395              slot->name);
 396 exit:
 397         dbg("Exit %s, rc=0x%x\n", __FUNCTION__, retval);
 398         return retval;
 399 }
 400
 401 static int setup_pci_hotplug_slot_info(struct slot *slot)
 402 {
 403         dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
 404             __FUNCTION__);
 405         rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
 406         rpaphp_get_pci_adapter_status(slot, 1,
 407                                       &slot->hotplug_slot->info->
 408                                       adapter_status);
 409         if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
 410                 err("%s: NOT_VALID: skip dn->full_name=%s\n",
 411                     __FUNCTION__, slot->dn->full_name);
 412                 return -1;
 413         }
 414         return 0;
 415 }
 416
 417 static int set_phb_slot_name(struct slot *slot)
 418 {
 419         struct device_node *dn;
 420         struct pci_controller *phb;
 421         struct pci_bus *bus;
 422
 423         dn = slot->dn;
 424         if (!dn) {
 425                 return 1;
 426         }
 427         phb = dn->phb;
 428         if (!phb) {
 429                 return 1;
 430         }
 431         bus = phb->bus;
 432         if (!bus) {
 433                 return 1;
 434         }
 435
 436         sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus),
 437                         bus->number, 0, 0);
 438         return 0;
 439 }
 440
 441 static int setup_pci_slot(struct slot *slot)
 442 {
 443         int rc;
 444
 445         if (slot->type == PHB) {
 446                 rc = set_phb_slot_name(slot);
 447                 if (rc) {
 448                         err("%s: failed to set phb slot name\n", __FUNCTION__);
 449                         goto exit_rc;
 450                 }
 451         } else {
 452                 slot->bridge = rpaphp_find_bridge_pdev(slot);
 453                 if (!slot->bridge) {
 454                         /* slot being added doesn't have pci_dev yet */
 455                         err("%s: no pci_dev for bridge dn %s\n",
 456                                         __FUNCTION__, slot->name);
 457                         goto exit_rc;
 458                 }
 459                 dbg("%s set slot->name to %s\n",  __FUNCTION__,
 460                                 pci_name(slot->bridge));
 461                 strcpy(slot->name, pci_name(slot->bridge));
 462         }
 463
 464         /* find slot's pci_dev if it's not empty */
 465         if (slot->hotplug_slot->info->adapter_status == EMPTY) {
 466                 slot->state = EMPTY;    /* slot is empty */
 467         } else {
 468                 /* slot is occupied */
 469                 if (!(slot->dn->child)) {
 470                         /* non-empty slot has to have child */
 471                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
 472                                 __FUNCTION__, slot->name);
 473                         goto exit_rc;
 474                 }
 475
 476                 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
 477                         dbg("%s CONFIGURING pci adapter in slot[%s]\n",
 478                                 __FUNCTION__, slot->name);
 479                         if (rpaphp_config_pci_adapter(slot)) {
 480                                 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
 481                                 goto exit_rc;
 482                         }
 483                 } else if (slot->hotplug_slot->info->adapter_status == CONFIGURED) {
 484                         if (init_slot_pci_funcs(slot)) {
 485                                 err("%s: init_slot_pci_funcs failed\n", __FUNCTION__);
 486                                 goto exit_rc;
 487                         }
 488
 489                 } else {
 490                         err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
 491                                 __FUNCTION__, slot->name);
 492                         goto exit_rc;
 493                 }
 494
 495                 print_slot_pci_funcs(slot);
 496                 if (!list_empty(&slot->dev.pci_funcs)) {
 497                         slot->state = CONFIGURED;
 498
 499                 } else {
 500                         /* DLPAR add as opposed to
 501                          * boot time */
 502                         slot->state = NOT_CONFIGURED;
 503                 }
 504         }
 505         return 0;
 506 exit_rc:
 507         dealloc_slot_struct(slot);
 508         return 1;
 509 }
 510
 511 int register_pci_slot(struct slot *slot)
 512 {
 513         int rc = 1;
 514
 515         slot->dev_type = PCI_DEV;
 516         if ((slot->type == EMBEDDED) || (slot->type == PHB))
 517                 slot->removable = 0;
 518         else
 519                 slot->removable = 1;
 520         INIT_LIST_HEAD(&slot->dev.pci_funcs);
 521         if (setup_pci_hotplug_slot_info(slot))
 522                 goto exit_rc;
 523         if (setup_pci_slot(slot))
 524                 goto exit_rc;
 525         rc = register_slot(slot);
 526 exit_rc:
 527         return rc;
 528 }
 529
 530 int rpaphp_enable_pci_slot(struct slot *slot)
 531 {
 532         int retval = 0, state;
 533
 534         retval = rpaphp_get_sensor_state(slot, &state);
 535         if (retval)
 536                 goto exit;
 537         dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
 538         /* if slot is not empty, enable the adapter */
 539         if (state == PRESENT) {
 540                 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
 541                 retval = rpaphp_config_pci_adapter(slot);
 542                 if (!retval) {
 543                         slot->state = CONFIGURED;
 544                         dbg("%s: PCI devices in slot[%s] has been configured\n",
 545                                 __FUNCTION__, slot->name);
 546                 } else {
 547                         slot->state = NOT_CONFIGURED;
 548                         dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
 549                             __FUNCTION__, slot->name);
 550                 }
 551         } else if (state == EMPTY) {
 552                 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
 553                 slot->state = EMPTY;
 554         } else {
 555                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
 556                     slot->name);
 557                 slot->state = NOT_VALID;
 558                 retval = -EINVAL;
 559         }
 560 exit:
 561         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 562         return retval;
 563 }
 564
 565 struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev)
 566 {
 567         struct list_head        *tmp, *n;
 568         struct slot             *slot;
 569
 570         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 571                 struct pci_bus *bus;
 572                 struct list_head *ln;
 573
 574                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 575                 if (slot->bridge == NULL) {
 576                         if (slot->dev_type == PCI_DEV) {
 577                                 printk(KERN_WARNING "PCI slot missing bridge %s %s \n",
 578                                                     slot->name, slot->location);
 579                         }
 580                         continue;
 581                 }
 582
 583                 bus = slot->bridge->subordinate;
 584                 if (!bus) {
 585                         continue;  /* should never happen? */
 586                 }
 587                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 588                                 struct pci_dev *pdev = pci_dev_b(ln);
 589                                 if (pdev == dev)
 590                                         return slot->hotplug_slot;
 591                 }
 592         }
 593
 594         return NULL;
 595 }
 596
 597 EXPORT_SYMBOL_GPL(rpaphp_find_hotplug_slot);