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 static void print_slot_pci_funcs(struct pci_bus *bus)
 291 {
 292         struct device_node *dn;
 293         struct pci_dev *dev;
 294
 295         dn = pci_bus_to_OF_node(bus);
 296         if (!dn)
 297                 return;
 298
 299         dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
 300         list_for_each_entry (dev, &bus->devices, bus_list)
 301                 dbg("\t%s\n", pci_name(dev));
 302         return;
 303 }
 304
 305 int rpaphp_config_pci_adapter(struct pci_bus *bus)
 306 {
 307         struct device_node *dn = pci_bus_to_OF_node(bus);
 308         struct pci_dev *dev;
 309         int rc = -ENODEV;
 310
 311         dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name);
 312         if (!dn)
 313                 goto exit;
 314
 315         eeh_add_device_tree_early(dn);
 316         dev = rpaphp_pci_config_slot(bus);
 317         if (!dev) {
 318                 err("%s: can't find any devices.\n", __FUNCTION__);
 319                 goto exit;
 320         }
 321         print_slot_pci_funcs(bus);
 322         rc = 0;
 323 exit:
 324         dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
 325         return rc;
 326 }
 327 EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter);
 328
 329 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
 330 {
 331         eeh_remove_device(dev);
 332         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 333                 struct pci_bus *bus = dev->subordinate;
 334                 struct list_head *ln;
 335                 if (!bus)
 336                         return;
 337                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
 338                         struct pci_dev *pdev = pci_dev_b(ln);
 339                         if (pdev)
 340                                 rpaphp_eeh_remove_bus_device(pdev);
 341                 }
 342
 343         }
 344         return;
 345 }
 346
 347 int rpaphp_unconfig_pci_adapter(struct pci_bus *bus)
 348 {
 349         struct pci_dev *dev, *tmp;
 350
 351         list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
 352                 rpaphp_eeh_remove_bus_device(dev);
 353                 pci_remove_bus_device(dev);
 354         }
 355         return 0;
 356 }
 357 EXPORT_SYMBOL_GPL(rpaphp_unconfig_pci_adapter);
 358
 359 static int setup_pci_hotplug_slot_info(struct slot *slot)
 360 {
 361         dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
 362             __FUNCTION__);
 363         rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
 364         rpaphp_get_pci_adapter_status(slot, 1,
 365                                       &slot->hotplug_slot->info->
 366                                       adapter_status);
 367         if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
 368                 err("%s: NOT_VALID: skip dn->full_name=%s\n",
 369                     __FUNCTION__, slot->dn->full_name);
 370                 return -EINVAL;
 371         }
 372         return 0;
 373 }
 374
 375 static void set_slot_name(struct slot *slot)
 376 {
 377         struct pci_bus *bus = slot->bus;
 378         struct pci_dev *bridge;
 379
 380         bridge = bus->self;
 381         if (bridge)
 382                 strcpy(slot->name, pci_name(bridge));
 383         else
 384                 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
 385                         bus->number);
 386 }
 387
 388 static int setup_pci_slot(struct slot *slot)
 389 {
 390         struct device_node *dn = slot->dn;
 391         struct pci_bus *bus;
 392
 393         BUG_ON(!dn);
 394         bus = rpaphp_find_pci_bus(dn);
 395         if (!bus) {
 396                 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
 397                 goto exit_rc;
 398         }
 399
 400         slot->bus = bus;
 401         slot->pci_devs = &bus->devices;
 402         set_slot_name(slot);
 403
 404         /* find slot's pci_dev if it's not empty */
 405         if (slot->hotplug_slot->info->adapter_status == EMPTY) {
 406                 slot->state = EMPTY;    /* slot is empty */
 407         } else {
 408                 /* slot is occupied */
 409                 if (!dn->child) {
 410                         /* non-empty slot has to have child */
 411                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
 412                                 __FUNCTION__, slot->name);
 413                         goto exit_rc;
 414                 }
 415
 416                 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
 417                         dbg("%s CONFIGURING pci adapter in slot[%s]\n",
 418                                 __FUNCTION__, slot->name);
 419                         if (rpaphp_config_pci_adapter(slot->bus)) {
 420                                 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
 421                                 goto exit_rc;
 422                         }
 423
 424                 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
 425                         err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
 426                                 __FUNCTION__, slot->name);
 427                         goto exit_rc;
 428                 }
 429                 print_slot_pci_funcs(slot->bus);
 430                 if (!list_empty(slot->pci_devs)) {
 431                         slot->state = CONFIGURED;
 432                 } else {
 433                         /* DLPAR add as opposed to
 434                          * boot time */
 435                         slot->state = NOT_CONFIGURED;
 436                 }
 437         }
 438         return 0;
 439 exit_rc:
 440         dealloc_slot_struct(slot);
 441         return -EINVAL;
 442 }
 443
 444 int register_pci_slot(struct slot *slot)
 445 {
 446         int rc = -EINVAL;
 447
 448         if (setup_pci_hotplug_slot_info(slot))
 449                 goto exit_rc;
 450         if (setup_pci_slot(slot))
 451                 goto exit_rc;
 452         rc = register_slot(slot);
 453 exit_rc:
 454         return rc;
 455 }
 456
 457 int rpaphp_enable_pci_slot(struct slot *slot)
 458 {
 459         int retval = 0, state;
 460
 461         retval = rpaphp_get_sensor_state(slot, &state);
 462         if (retval)
 463                 goto exit;
 464         dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
 465         /* if slot is not empty, enable the adapter */
 466         if (state == PRESENT) {
 467                 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
 468                 retval = rpaphp_config_pci_adapter(slot->bus);
 469                 if (!retval) {
 470                         slot->state = CONFIGURED;
 471                         info("%s: devices in slot[%s] configured\n",
 472                                         __FUNCTION__, slot->name);
 473                 } else {
 474                         slot->state = NOT_CONFIGURED;
 475                         dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
 476                             __FUNCTION__, slot->name);
 477                 }
 478         } else if (state == EMPTY) {
 479                 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
 480                 slot->state = EMPTY;
 481         } else {
 482                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
 483                     slot->name);
 484                 slot->state = NOT_VALID;
 485                 retval = -EINVAL;
 486         }
 487 exit:
 488         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 489         return retval;
 490 }