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