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 <linux/string.h>
  27
  28 #include <asm/pci-bridge.h>
  29 #include <asm/rtas.h>
  30 #include <asm/machdep.h>
  31
  32 #include "../pci.h"             /* for pci_add_new_bus */
  33 #include "rpaphp.h"
  34
  35 static struct pci_bus *find_bus_among_children(struct pci_bus *bus,
  36                                         struct device_node *dn)
  37 {
  38         struct pci_bus *child = NULL;
  39         struct list_head *tmp;
  40         struct device_node *busdn;
  41
  42         busdn = pci_bus_to_OF_node(bus);
  43         if (busdn == dn)
  44                 return bus;
  45
  46         list_for_each(tmp, &bus->children) {
  47                 child = find_bus_among_children(pci_bus_b(tmp), dn);
  48                 if (child)
  49                         break;
  50         }
  51         return child;
  52 }
  53
  54 struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn)
  55 {
  56         struct pci_dn *pdn = dn->data;
  57
  58         if (!pdn  || !pdn->phb || !pdn->phb->bus)
  59                 return NULL;
  60
  61         return find_bus_among_children(pdn->phb->bus, dn);
  62 }
  63 EXPORT_SYMBOL_GPL(rpaphp_find_pci_bus);
  64
  65 int rpaphp_claim_resource(struct pci_dev *dev, int resource)
  66 {
  67         struct resource *res = &dev->resource[resource];
  68         struct resource *root = pci_find_parent_resource(dev, res);
  69         char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
  70         int err = -EINVAL;
  71
  72         if (root != NULL) {
  73                 err = request_resource(root, res);
  74         }
  75
  76         if (err) {
  77                 err("PCI: %s region %d of %s %s [%lx:%lx]\n",
  78                     root ? "Address space collision on" :
  79                     "No parent found for",
  80                     resource, dtype, pci_name(dev), res->start, res->end);
  81         }
  82         return err;
  83 }
  84
  85 EXPORT_SYMBOL_GPL(rpaphp_claim_resource);
  86
  87 static int rpaphp_get_sensor_state(struct slot *slot, int *state)
  88 {
  89         int rc;
  90         int setlevel;
  91
  92         rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
  93
  94         if (rc < 0) {
  95                 if (rc == -EFAULT || rc == -EEXIST) {
  96                         dbg("%s: slot must be power up to get sensor-state\n",
  97                             __FUNCTION__);
  98
  99                         /* some slots have to be powered up
 100                          * before get-sensor will succeed.
 101                          */
 102                         rc = rtas_set_power_level(slot->power_domain, POWER_ON,
 103                                                   &setlevel);
 104                         if (rc < 0) {
 105                                 dbg("%s: power on slot[%s] failed rc=%d.\n",
 106                                     __FUNCTION__, slot->name, rc);
 107                         } else {
 108                                 rc = rtas_get_sensor(DR_ENTITY_SENSE,
 109                                                      slot->index, state);
 110                         }
 111                 } else if (rc == -ENODEV)
 112                         info("%s: slot is unusable\n", __FUNCTION__);
 113                 else
 114                         err("%s failed to get sensor state\n", __FUNCTION__);
 115         }
 116         return rc;
 117 }
 118
 119 /**
 120  * get_pci_adapter_status - get the status of a slot
 121  *
 122  * 0-- slot is empty
 123  * 1-- adapter is configured
 124  * 2-- adapter is not configured
 125  * 3-- not valid
 126  */
 127 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
 128 {
 129         struct pci_bus *bus;
 130         int state, rc;
 131
 132         *value = NOT_VALID;
 133         rc = rpaphp_get_sensor_state(slot, &state);
 134         if (rc)
 135                 goto exit;
 136
 137         if (state == EMPTY)
 138                 *value = EMPTY;
 139         else if (state == PRESENT) {
 140                 if (!is_init) {
 141                         /* at run-time slot->state can be changed by */
 142                         /* config/unconfig adapter */
 143                         *value = slot->state;
 144                 } else {
 145                         bus = rpaphp_find_pci_bus(slot->dn);
 146                         if (bus && !list_empty(&bus->devices))
 147                                 *value = CONFIGURED;
 148                         else
 149                                 *value = NOT_CONFIGURED;
 150                 }
 151         }
 152 exit:
 153         return rc;
 154 }
 155
 156 /* Must be called before pci_bus_add_devices */
 157 void rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
 158 {
 159         struct pci_dev *dev;
 160
 161         list_for_each_entry(dev, &bus->devices, bus_list) {
 162                 /*
 163                  * Skip already-present devices (which are on the
 164                  * global device list.)
 165                  */
 166                 if (list_empty(&dev->global_list)) {
 167                         int i;
 168
 169                         /* Need to setup IOMMU tables */
 170                         ppc_md.iommu_dev_setup(dev);
 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 void rpaphp_eeh_add_bus_device(struct pci_bus *bus)
 187 {
 188         struct pci_dev *dev;
 189
 190         list_for_each_entry(dev, &bus->devices, bus_list) {
 191                 eeh_add_device_late(dev);
 192                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 193                         struct pci_bus *subbus = dev->subordinate;
 194                         if (subbus)
 195                                 rpaphp_eeh_add_bus_device (subbus);
 196                 }
 197         }
 198 }
 199
 200 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
 201 {
 202         u8 sec_busno;
 203         struct pci_bus *child_bus;
 204         struct pci_dev *child_dev;
 205
 206         dbg("Enter %s:  BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
 207
 208         /* get busno of downstream bus */
 209         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
 210
 211         /* add to children of PCI bridge dev->bus */
 212         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
 213         if (!child_bus) {
 214                 err("%s: could not add second bus\n", __FUNCTION__);
 215                 return -EIO;
 216         }
 217         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
 218         /* do pci_scan_child_bus */
 219         pci_scan_child_bus(child_bus);
 220
 221         list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
 222                 eeh_add_device_late(child_dev);
 223         }
 224
 225          /* fixup new pci devices without touching bus struct */
 226         rpaphp_fixup_new_pci_devices(child_bus, 0);
 227
 228         /* Make the discovered devices available */
 229         pci_bus_add_devices(child_bus);
 230         return 0;
 231 }
 232
 233 void rpaphp_init_new_devs(struct pci_bus *bus)
 234 {
 235         rpaphp_fixup_new_pci_devices(bus, 0);
 236         rpaphp_eeh_add_bus_device(bus);
 237 }
 238 EXPORT_SYMBOL_GPL(rpaphp_init_new_devs);
 239
 240 /*****************************************************************************
 241  rpaphp_pci_config_slot() will  configure all devices under the
 242  given slot->dn and return the the first pci_dev.
 243  *****************************************************************************/
 244 static struct pci_dev *
 245 rpaphp_pci_config_slot(struct pci_bus *bus)
 246 {
 247         struct device_node *dn = pci_bus_to_OF_node(bus);
 248         struct pci_dev *dev = NULL;
 249         int slotno;
 250         int num;
 251
 252         dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
 253         if (!dn || !dn->child)
 254                 return NULL;
 255
 256         if (_machine == PLATFORM_PSERIES_LPAR) {
 257                 of_scan_bus(dn, bus);
 258                 if (list_empty(&bus->devices)) {
 259                         err("%s: No new device found\n", __FUNCTION__);
 260                         return NULL;
 261                 }
 262
 263                 rpaphp_init_new_devs(bus);
 264                 pci_bus_add_devices(bus);
 265                 dev = list_entry(&bus->devices, struct pci_dev, bus_list);
 266         } else {
 267                 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
 268
 269                 /* pci_scan_slot should find all children */
 270                 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
 271                 if (num) {
 272                         rpaphp_fixup_new_pci_devices(bus, 1);
 273                         pci_bus_add_devices(bus);
 274                 }
 275                 if (list_empty(&bus->devices)) {
 276                         err("%s: No new device found\n", __FUNCTION__);
 277                         return NULL;
 278                 }
 279                 list_for_each_entry(dev, &bus->devices, bus_list) {
 280                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 281                                 rpaphp_pci_config_bridge(dev);
 282
 283                         rpaphp_eeh_add_bus_device(bus);
 284                 }
 285         }
 286
 287         return dev;
 288 }
 289
 290 void rpaphp_eeh_init_nodes(struct device_node *dn)
 291 {
 292         struct device_node *sib;
 293
 294         for (sib = dn->child; sib; sib = sib->sibling)
 295                 rpaphp_eeh_init_nodes(sib);
 296         eeh_add_device_early(dn);
 297         return;
 298
 299 }
 300 EXPORT_SYMBOL_GPL(rpaphp_eeh_init_nodes);
 301
 302 static void print_slot_pci_funcs(struct pci_bus *bus)
 303 {
 304         struct device_node *dn;
 305         struct pci_dev *dev;
 306
 307         dn = pci_bus_to_OF_node(bus);
 308         if (!dn)
 309                 return;
 310
 311         dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
 312         list_for_each_entry (dev, &bus->devices, bus_list)
 313                 dbg("\t%s\n", pci_name(dev));
 314         return;
 315 }
 316
 317 int rpaphp_config_pci_adapter(struct pci_bus *bus)
 318 {
 319         struct device_node *dn = pci_bus_to_OF_node(bus);
 320         struct pci_dev *dev;
 321         int rc = -ENODEV;
 322
 323         dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name);
 324         if (!dn)
 325                 goto exit;
 326
 327         rpaphp_eeh_init_nodes(dn);
 328         dev = rpaphp_pci_config_slot(bus);
 329         if (!dev) {
 330                 err("%s: can't find any devices.\n", __FUNCTION__);
 331                 goto exit;
 332         }
 333         print_slot_pci_funcs(bus);
 334         rc = 0;
 335 exit:
 336         dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
 337         return rc;
 338 }
 339 EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter);
 340
 341 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
 342 {
 343         eeh_remove_device(dev);
 344         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 345                 struct pci_bus *bus = dev->subordinate;
 346                 struct list_head *ln;
 347                 if (!bus)
 348                         return;
 349                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 350                         struct pci_dev *pdev = pci_dev_b(ln);
 351                         if (pdev)
 352                                 rpaphp_eeh_remove_bus_device(pdev);
 353                 }
 354
 355         }
 356         return;
 357 }
 358
 359 int rpaphp_unconfig_pci_adapter(struct pci_bus *bus)
 360 {
 361         struct pci_dev *dev, *tmp;
 362
 363         list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
 364                 rpaphp_eeh_remove_bus_device(dev);
 365                 pci_remove_bus_device(dev);
 366         }
 367         return 0;
 368 }
 369 EXPORT_SYMBOL_GPL(rpaphp_unconfig_pci_adapter);
 370
 371 static int setup_pci_hotplug_slot_info(struct slot *slot)
 372 {
 373         dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
 374             __FUNCTION__);
 375         rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
 376         rpaphp_get_pci_adapter_status(slot, 1,
 377                                       &slot->hotplug_slot->info->
 378                                       adapter_status);
 379         if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
 380                 err("%s: NOT_VALID: skip dn->full_name=%s\n",
 381                     __FUNCTION__, slot->dn->full_name);
 382                 return -EINVAL;
 383         }
 384         return 0;
 385 }
 386
 387 static void set_slot_name(struct slot *slot)
 388 {
 389         struct pci_bus *bus = slot->bus;
 390         struct pci_dev *bridge;
 391
 392         bridge = bus->self;
 393         if (bridge)
 394                 strcpy(slot->name, pci_name(bridge));
 395         else
 396                 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
 397                         bus->number);
 398 }
 399
 400 static int setup_pci_slot(struct slot *slot)
 401 {
 402         struct device_node *dn = slot->dn;
 403         struct pci_bus *bus;
 404
 405         BUG_ON(!dn);
 406         bus = rpaphp_find_pci_bus(dn);
 407         if (!bus) {
 408                 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
 409                 goto exit_rc;
 410         }
 411
 412         slot->bus = bus;
 413         slot->pci_devs = &bus->devices;
 414         set_slot_name(slot);
 415
 416         /* find slot's pci_dev if it's not empty */
 417         if (slot->hotplug_slot->info->adapter_status == EMPTY) {
 418                 slot->state = EMPTY;    /* slot is empty */
 419         } else {
 420                 /* slot is occupied */
 421                 if (!dn->child) {
 422                         /* non-empty slot has to have child */
 423                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
 424                                 __FUNCTION__, slot->name);
 425                         goto exit_rc;
 426                 }
 427
 428                 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
 429                         dbg("%s CONFIGURING pci adapter in slot[%s]\n",
 430                                 __FUNCTION__, slot->name);
 431                         if (rpaphp_config_pci_adapter(slot->bus)) {
 432                                 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
 433                                 goto exit_rc;
 434                         }
 435
 436                 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
 437                         err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
 438                                 __FUNCTION__, slot->name);
 439                         goto exit_rc;
 440                 }
 441                 print_slot_pci_funcs(slot->bus);
 442                 if (!list_empty(slot->pci_devs)) {
 443                         slot->state = CONFIGURED;
 444                 } else {
 445                         /* DLPAR add as opposed to
 446                          * boot time */
 447                         slot->state = NOT_CONFIGURED;
 448                 }
 449         }
 450         return 0;
 451 exit_rc:
 452         dealloc_slot_struct(slot);
 453         return -EINVAL;
 454 }
 455
 456 int register_pci_slot(struct slot *slot)
 457 {
 458         int rc = -EINVAL;
 459
 460         if (setup_pci_hotplug_slot_info(slot))
 461                 goto exit_rc;
 462         if (setup_pci_slot(slot))
 463                 goto exit_rc;
 464         rc = register_slot(slot);
 465 exit_rc:
 466         return rc;
 467 }
 468
 469 int rpaphp_enable_pci_slot(struct slot *slot)
 470 {
 471         int retval = 0, state;
 472
 473         retval = rpaphp_get_sensor_state(slot, &state);
 474         if (retval)
 475                 goto exit;
 476         dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
 477         /* if slot is not empty, enable the adapter */
 478         if (state == PRESENT) {
 479                 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
 480                 retval = rpaphp_config_pci_adapter(slot->bus);
 481                 if (!retval) {
 482                         slot->state = CONFIGURED;
 483                         info("%s: devices in slot[%s] configured\n",
 484                                         __FUNCTION__, slot->name);
 485                 } else {
 486                         slot->state = NOT_CONFIGURED;
 487                         dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
 488                             __FUNCTION__, slot->name);
 489                 }
 490         } else if (state == EMPTY) {
 491                 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
 492                 slot->state = EMPTY;
 493         } else {
 494                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
 495                     slot->name);
 496                 slot->state = NOT_VALID;
 497                 retval = -EINVAL;
 498         }
 499 exit:
 500         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 501         return retval;
 502 }