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         u8 sec_busno;
 192         struct pci_bus *child_bus;
 193         struct pci_dev *child_dev;
 194
 195         dbg("Enter %s:  BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
 196
 197         /* get busno of downstream bus */
 198         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
 199
 200         /* add to children of PCI bridge dev->bus */
 201         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
 202         if (!child_bus) {
 203                 err("%s: could not add second bus\n", __FUNCTION__);
 204                 return -EIO;
 205         }
 206         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
 207         /* do pci_scan_child_bus */
 208         pci_scan_child_bus(child_bus);
 209
 210         list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
 211                 eeh_add_device_late(child_dev);
 212         }
 213
 214          /* fixup new pci devices without touching bus struct */
 215         rpaphp_fixup_new_pci_devices(child_bus, 0);
 216
 217         /* Make the discovered devices available */
 218         pci_bus_add_devices(child_bus);
 219         return 0;
 220 }
 221
 222 /*****************************************************************************
 223  rpaphp_pci_config_slot() will  configure all devices under the
 224  given slot->dn and return the the first pci_dev.
 225  *****************************************************************************/
 226 static struct pci_dev *
 227 rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus)
 228 {
 229         struct device_node *eads_first_child = dn->child;
 230         struct pci_dev *dev = NULL;
 231         int num;
 232
 233         dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
 234
 235         if (eads_first_child) {
 236                 /* pci_scan_slot should find all children of EADs */
 237                 num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0));
 238                 if (num) {
 239                         rpaphp_fixup_new_pci_devices(bus, 1);
 240                         pci_bus_add_devices(bus);
 241                 }
 242                 dev = rpaphp_find_pci_dev(eads_first_child);
 243                 if (!dev) {
 244                         err("No new device found\n");
 245                         return NULL;
 246                 }
 247                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 248                         rpaphp_pci_config_bridge(dev);
 249         }
 250         return dev;
 251 }
 252
 253 static void enable_eeh(struct device_node *dn)
 254 {
 255         struct device_node *sib;
 256
 257         for (sib = dn->child; sib; sib = sib->sibling)
 258                 enable_eeh(sib);
 259         eeh_add_device_early(dn);
 260         return;
 261
 262 }
 263
 264 static void print_slot_pci_funcs(struct slot *slot)
 265 {
 266         struct pci_dev *dev;
 267
 268         dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, slot->name);
 269         list_for_each_entry (dev, slot->pci_devs, bus_list)
 270                 dbg("\t%s\n", pci_name(dev));
 271         return;
 272 }
 273
 274 static int rpaphp_config_pci_adapter(struct slot *slot)
 275 {
 276         struct pci_bus *pci_bus;
 277         struct pci_dev *dev;
 278         int rc = -ENODEV;
 279
 280         dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
 281
 282         if (slot->bridge) {
 283
 284                 pci_bus = slot->bridge->subordinate;
 285                 if (!pci_bus) {
 286                         err("%s: can't find bus structure\n", __FUNCTION__);
 287                         goto exit;
 288                 }
 289                 enable_eeh(slot->dn);
 290                 dev = rpaphp_pci_config_slot(slot->dn, pci_bus);
 291                 if (!dev) {
 292                         err("%s: can't find any devices.\n", __FUNCTION__);
 293                         goto exit;
 294                 }
 295                 print_slot_pci_funcs(slot);
 296                 rc = 0;
 297         } else {
 298                 /* slot is not enabled */
 299                 err("slot doesn't have pci_dev structure\n");
 300         }
 301 exit:
 302         dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
 303         return rc;
 304 }
 305
 306 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
 307 {
 308         eeh_remove_device(dev);
 309         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 310                 struct pci_bus *bus = dev->subordinate;
 311                 struct list_head *ln;
 312                 if (!bus)
 313                         return;
 314                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 315                         struct pci_dev *pdev = pci_dev_b(ln);
 316                         if (pdev)
 317                                 rpaphp_eeh_remove_bus_device(pdev);
 318                 }
 319
 320         }
 321         return;
 322 }
 323
 324 int rpaphp_unconfig_pci_adapter(struct slot *slot)
 325 {
 326         struct pci_dev *dev;
 327         int retval = 0;
 328
 329         list_for_each_entry(dev, slot->pci_devs, bus_list)
 330                 rpaphp_eeh_remove_bus_device(dev);
 331
 332         pci_remove_behind_bridge(slot->bridge);
 333         slot->state = NOT_CONFIGURED;
 334         info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
 335              slot->name);
 336         return retval;
 337 }
 338
 339 static int setup_pci_hotplug_slot_info(struct slot *slot)
 340 {
 341         dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
 342             __FUNCTION__);
 343         rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
 344         rpaphp_get_pci_adapter_status(slot, 1,
 345                                       &slot->hotplug_slot->info->
 346                                       adapter_status);
 347         if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
 348                 err("%s: NOT_VALID: skip dn->full_name=%s\n",
 349                     __FUNCTION__, slot->dn->full_name);
 350                 return -EINVAL;
 351         }
 352         return 0;
 353 }
 354
 355 static int set_phb_slot_name(struct slot *slot)
 356 {
 357         struct device_node *dn;
 358         struct pci_controller *phb;
 359         struct pci_bus *bus;
 360
 361         dn = slot->dn;
 362         if (!dn) {
 363                 return -EINVAL;
 364         }
 365         phb = dn->phb;
 366         if (!phb) {
 367                 return -EINVAL;
 368         }
 369         bus = phb->bus;
 370         if (!bus) {
 371                 return -EINVAL;
 372         }
 373
 374         sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus),
 375                         bus->number, 0, 0);
 376         return 0;
 377 }
 378
 379 static int setup_pci_slot(struct slot *slot)
 380 {
 381         struct pci_bus *bus;
 382         int rc;
 383
 384         if (slot->type == PHB) {
 385                 rc = set_phb_slot_name(slot);
 386                 if (rc < 0) {
 387                         err("%s: failed to set phb slot name\n", __FUNCTION__);
 388                         goto exit_rc;
 389                 }
 390         } else {
 391                 slot->bridge = rpaphp_find_bridge_pdev(slot);
 392                 if (!slot->bridge) {
 393                         /* slot being added doesn't have pci_dev yet */
 394                         err("%s: no pci_dev for bridge dn %s\n",
 395                                         __FUNCTION__, slot->name);
 396                         goto exit_rc;
 397                 }
 398
 399                 bus = slot->bridge->subordinate;
 400                 if (!bus)
 401                         goto exit_rc;
 402                 slot->pci_devs = &bus->devices;
 403
 404                 dbg("%s set slot->name to %s\n",  __FUNCTION__,
 405                                 pci_name(slot->bridge));
 406                 strcpy(slot->name, pci_name(slot->bridge));
 407         }
 408
 409         /* find slot's pci_dev if it's not empty */
 410         if (slot->hotplug_slot->info->adapter_status == EMPTY) {
 411                 slot->state = EMPTY;    /* slot is empty */
 412         } else {
 413                 /* slot is occupied */
 414                 if (!(slot->dn->child)) {
 415                         /* non-empty slot has to have child */
 416                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
 417                                 __FUNCTION__, slot->name);
 418                         goto exit_rc;
 419                 }
 420
 421                 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
 422                         dbg("%s CONFIGURING pci adapter in slot[%s]\n",
 423                                 __FUNCTION__, slot->name);
 424                         if (rpaphp_config_pci_adapter(slot)) {
 425                                 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
 426                                 goto exit_rc;
 427                         }
 428
 429                 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
 430                         err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
 431                                 __FUNCTION__, slot->name);
 432                         goto exit_rc;
 433                 }
 434                 print_slot_pci_funcs(slot);
 435                 if (!list_empty(slot->pci_devs)) {
 436                         slot->state = CONFIGURED;
 437                 } else {
 438                         /* DLPAR add as opposed to
 439                          * boot time */
 440                         slot->state = NOT_CONFIGURED;
 441                 }
 442         }
 443         return 0;
 444 exit_rc:
 445         dealloc_slot_struct(slot);
 446         return -EINVAL;
 447 }
 448
 449 int register_pci_slot(struct slot *slot)
 450 {
 451         int rc = -EINVAL;
 452
 453         if ((slot->type == EMBEDDED) || (slot->type == PHB))
 454                 slot->removable = 0;
 455         else
 456                 slot->removable = 1;
 457         if (setup_pci_hotplug_slot_info(slot))
 458                 goto exit_rc;
 459         if (setup_pci_slot(slot))
 460                 goto exit_rc;
 461         rc = register_slot(slot);
 462 exit_rc:
 463         return rc;
 464 }
 465
 466 int rpaphp_enable_pci_slot(struct slot *slot)
 467 {
 468         int retval = 0, state;
 469
 470         retval = rpaphp_get_sensor_state(slot, &state);
 471         if (retval)
 472                 goto exit;
 473         dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
 474         /* if slot is not empty, enable the adapter */
 475         if (state == PRESENT) {
 476                 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
 477                 retval = rpaphp_config_pci_adapter(slot);
 478                 if (!retval) {
 479                         slot->state = CONFIGURED;
 480                         dbg("%s: PCI devices in slot[%s] has been configured\n",
 481                                 __FUNCTION__, slot->name);
 482                 } else {
 483                         slot->state = NOT_CONFIGURED;
 484                         dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
 485                             __FUNCTION__, slot->name);
 486                 }
 487         } else if (state == EMPTY) {
 488                 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
 489                 slot->state = EMPTY;
 490         } else {
 491                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
 492                     slot->name);
 493                 slot->state = NOT_VALID;
 494                 retval = -EINVAL;
 495         }
 496 exit:
 497         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 498         return retval;
 499 }