drivers/acpi/pci_root.c

   1 /*
   2  *  pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/pm.h>
  33 #include <linux/pm_runtime.h>
  34 #include <linux/pci.h>
  35 #include <linux/pci-acpi.h>
  36 #include <linux/acpi.h>
  37 #include <acpi/acpi_bus.h>
  38 #include <acpi/acpi_drivers.h>
  39
  40 #define PREFIX "ACPI: "
  41
  42 #define _COMPONENT              ACPI_PCI_COMPONENT
  43 ACPI_MODULE_NAME("pci_root");
  44 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
  45 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
  46 static int acpi_pci_root_add(struct acpi_device *device);
  47 static int acpi_pci_root_remove(struct acpi_device *device, int type);
  48 static int acpi_pci_root_start(struct acpi_device *device);
  49
  50 static const struct acpi_device_id root_device_ids[] = {
  51         {"PNP0A03", 0},
  52         {"", 0},
  53 };
  54 MODULE_DEVICE_TABLE(acpi, root_device_ids);
  55
  56 static struct acpi_driver acpi_pci_root_driver = {
  57         .name = "pci_root",
  58         .class = ACPI_PCI_ROOT_CLASS,
  59         .ids = root_device_ids,
  60         .ops = {
  61                 .add = acpi_pci_root_add,
  62                 .remove = acpi_pci_root_remove,
  63                 .start = acpi_pci_root_start,
  64                 },
  65 };
  66
  67 static LIST_HEAD(acpi_pci_roots);
  68
  69 static struct acpi_pci_driver *sub_driver;
  70 static DEFINE_MUTEX(osc_lock);
  71
  72 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
  73 {
  74         int n = 0;
  75         struct acpi_pci_root *root;
  76
  77         struct acpi_pci_driver **pptr = &sub_driver;
  78         while (*pptr)
  79                 pptr = &(*pptr)->next;
  80         *pptr = driver;
  81
  82         if (!driver->add)
  83                 return 0;
  84
  85         list_for_each_entry(root, &acpi_pci_roots, node) {
  86                 driver->add(root->device->handle);
  87                 n++;
  88         }
  89
  90         return n;
  91 }
  92
  93 EXPORT_SYMBOL(acpi_pci_register_driver);
  94
  95 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
  96 {
  97         struct acpi_pci_root *root;
  98
  99         struct acpi_pci_driver **pptr = &sub_driver;
 100         while (*pptr) {
 101                 if (*pptr == driver)
 102                         break;
 103                 pptr = &(*pptr)->next;
 104         }
 105         BUG_ON(!*pptr);
 106         *pptr = (*pptr)->next;
 107
 108         if (!driver->remove)
 109                 return;
 110
 111         list_for_each_entry(root, &acpi_pci_roots, node)
 112                 driver->remove(root->device->handle);
 113 }
 114
 115 EXPORT_SYMBOL(acpi_pci_unregister_driver);
 116
 117 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
 118 {
 119         struct acpi_pci_root *root;
 120
 121         list_for_each_entry(root, &acpi_pci_roots, node)
 122                 if ((root->segment == (u16) seg) && (root->bus_nr == (u16) bus))
 123                         return root->device->handle;
 124         return NULL;
 125 }
 126
 127 EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
 128
 129 /**
 130  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
 131  * @handle - the ACPI CA node in question.
 132  *
 133  * Note: we could make this API take a struct acpi_device * instead, but
 134  * for now, it's more convenient to operate on an acpi_handle.
 135  */
 136 int acpi_is_root_bridge(acpi_handle handle)
 137 {
 138         int ret;
 139         struct acpi_device *device;
 140
 141         ret = acpi_bus_get_device(handle, &device);
 142         if (ret)
 143                 return 0;
 144
 145         ret = acpi_match_device_ids(device, root_device_ids);
 146         if (ret)
 147                 return 0;
 148         else
 149                 return 1;
 150 }
 151 EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
 152
 153 static acpi_status
 154 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 155 {
 156         int *busnr = data;
 157         struct acpi_resource_address64 address;
 158
 159         if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
 160             resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
 161             resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
 162                 return AE_OK;
 163
 164         acpi_resource_to_address64(resource, &address);
 165         if ((address.address_length > 0) &&
 166             (address.resource_type == ACPI_BUS_NUMBER_RANGE))
 167                 *busnr = address.minimum;
 168
 169         return AE_OK;
 170 }
 171
 172 static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
 173                                              unsigned long long *bus)
 174 {
 175         acpi_status status;
 176         int busnum;
 177
 178         busnum = -1;
 179         status =
 180             acpi_walk_resources(handle, METHOD_NAME__CRS,
 181                                 get_root_bridge_busnr_callback, &busnum);
 182         if (ACPI_FAILURE(status))
 183                 return status;
 184         /* Check if we really get a bus number from _CRS */
 185         if (busnum == -1)
 186                 return AE_ERROR;
 187         *bus = busnum;
 188         return AE_OK;
 189 }
 190
 191 static void acpi_pci_bridge_scan(struct acpi_device *device)
 192 {
 193         int status;
 194         struct acpi_device *child = NULL;
 195
 196         if (device->flags.bus_address)
 197                 if (device->parent && device->parent->ops.bind) {
 198                         status = device->parent->ops.bind(device);
 199                         if (!status) {
 200                                 list_for_each_entry(child, &device->children, node)
 201                                         acpi_pci_bridge_scan(child);
 202                         }
 203                 }
 204 }
 205
 206 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
 207
 208 static acpi_status acpi_pci_run_osc(acpi_handle handle,
 209                                     const u32 *capbuf, u32 *retval)
 210 {
 211         struct acpi_osc_context context = {
 212                 .uuid_str = pci_osc_uuid_str,
 213                 .rev = 1,
 214                 .cap.length = 12,
 215                 .cap.pointer = (void *)capbuf,
 216         };
 217         acpi_status status;
 218
 219         status = acpi_run_osc(handle, &context);
 220         if (ACPI_SUCCESS(status)) {
 221                 *retval = *((u32 *)(context.ret.pointer + 8));
 222                 kfree(context.ret.pointer);
 223         }
 224         return status;
 225 }
 226
 227 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
 228 {
 229         acpi_status status;
 230         u32 support_set, result, capbuf[3];
 231
 232         /* do _OSC query for all possible controls */
 233         support_set = root->osc_support_set | (flags & OSC_PCI_SUPPORT_MASKS);
 234         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 235         capbuf[OSC_SUPPORT_TYPE] = support_set;
 236         capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
 237
 238         status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
 239         if (ACPI_SUCCESS(status)) {
 240                 root->osc_support_set = support_set;
 241                 root->osc_control_qry = result;
 242                 root->osc_queried = 1;
 243         }
 244         return status;
 245 }
 246
 247 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
 248 {
 249         acpi_status status;
 250         acpi_handle tmp;
 251
 252         status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
 253         if (ACPI_FAILURE(status))
 254                 return status;
 255         mutex_lock(&osc_lock);
 256         status = acpi_pci_query_osc(root, flags);
 257         mutex_unlock(&osc_lock);
 258         return status;
 259 }
 260
 261 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
 262 {
 263         struct acpi_pci_root *root;
 264
 265         list_for_each_entry(root, &acpi_pci_roots, node) {
 266                 if (root->device->handle == handle)
 267                         return root;
 268         }
 269         return NULL;
 270 }
 271 EXPORT_SYMBOL_GPL(acpi_pci_find_root);
 272
 273 struct acpi_handle_node {
 274         struct list_head node;
 275         acpi_handle handle;
 276 };
 277
 278 /**
 279  * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
 280  * @handle: the handle in question
 281  *
 282  * Given an ACPI CA handle, the desired PCI device is located in the
 283  * list of PCI devices.
 284  *
 285  * If the device is found, its reference count is increased and this
 286  * function returns a pointer to its data structure.  The caller must
 287  * decrement the reference count by calling pci_dev_put().
 288  * If no device is found, %NULL is returned.
 289  */
 290 struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
 291 {
 292         int dev, fn;
 293         unsigned long long adr;
 294         acpi_status status;
 295         acpi_handle phandle;
 296         struct pci_bus *pbus;
 297         struct pci_dev *pdev = NULL;
 298         struct acpi_handle_node *node, *tmp;
 299         struct acpi_pci_root *root;
 300         LIST_HEAD(device_list);
 301
 302         /*
 303          * Walk up the ACPI CA namespace until we reach a PCI root bridge.
 304          */
 305         phandle = handle;
 306         while (!acpi_is_root_bridge(phandle)) {
 307                 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
 308                 if (!node)
 309                         goto out;
 310
 311                 INIT_LIST_HEAD(&node->node);
 312                 node->handle = phandle;
 313                 list_add(&node->node, &device_list);
 314
 315                 status = acpi_get_parent(phandle, &phandle);
 316                 if (ACPI_FAILURE(status))
 317                         goto out;
 318         }
 319
 320         root = acpi_pci_find_root(phandle);
 321         if (!root)
 322                 goto out;
 323
 324         pbus = root->bus;
 325
 326         /*
 327          * Now, walk back down the PCI device tree until we return to our
 328          * original handle. Assumes that everything between the PCI root
 329          * bridge and the device we're looking for must be a P2P bridge.
 330          */
 331         list_for_each_entry(node, &device_list, node) {
 332                 acpi_handle hnd = node->handle;
 333                 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
 334                 if (ACPI_FAILURE(status))
 335                         goto out;
 336                 dev = (adr >> 16) & 0xffff;
 337                 fn  = adr & 0xffff;
 338
 339                 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
 340                 if (!pdev || hnd == handle)
 341                         break;
 342
 343                 pbus = pdev->subordinate;
 344                 pci_dev_put(pdev);
 345
 346                 /*
 347                  * This function may be called for a non-PCI device that has a
 348                  * PCI parent (eg. a disk under a PCI SATA controller).  In that
 349                  * case pdev->subordinate will be NULL for the parent.
 350                  */
 351                 if (!pbus) {
 352                         dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
 353                         pdev = NULL;
 354                         break;
 355                 }
 356         }
 357 out:
 358         list_for_each_entry_safe(node, tmp, &device_list, node)
 359                 kfree(node);
 360
 361         return pdev;
 362 }
 363 EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
 364
 365 /**
 366  * acpi_pci_osc_control_set - commit requested control to Firmware
 367  * @handle: acpi_handle for the target ACPI object
 368  * @flags: driver's requested control bits
 369  *
 370  * Attempt to take control from Firmware on requested control bits.
 371  **/
 372 acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 flags)
 373 {
 374         acpi_status status;
 375         u32 control_req, result, capbuf[3];
 376         acpi_handle tmp;
 377         struct acpi_pci_root *root;
 378
 379         status = acpi_get_handle(handle, "_OSC", &tmp);
 380         if (ACPI_FAILURE(status))
 381                 return status;
 382
 383         control_req = (flags & OSC_PCI_CONTROL_MASKS);
 384         if (!control_req)
 385                 return AE_TYPE;
 386
 387         root = acpi_pci_find_root(handle);
 388         if (!root)
 389                 return AE_NOT_EXIST;
 390
 391         mutex_lock(&osc_lock);
 392         /* No need to evaluate _OSC if the control was already granted. */
 393         if ((root->osc_control_set & control_req) == control_req)
 394                 goto out;
 395
 396         /* Need to query controls first before requesting them */
 397         if (!root->osc_queried) {
 398                 status = acpi_pci_query_osc(root, root->osc_support_set);
 399                 if (ACPI_FAILURE(status))
 400                         goto out;
 401         }
 402         if ((root->osc_control_qry & control_req) != control_req) {
 403                 printk(KERN_DEBUG
 404                        "Firmware did not grant requested _OSC control\n");
 405                 status = AE_SUPPORT;
 406                 goto out;
 407         }
 408
 409         capbuf[OSC_QUERY_TYPE] = 0;
 410         capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
 411         capbuf[OSC_CONTROL_TYPE] = root->osc_control_set | control_req;
 412         status = acpi_pci_run_osc(handle, capbuf, &result);
 413         if (ACPI_SUCCESS(status))
 414                 root->osc_control_set = result;
 415 out:
 416         mutex_unlock(&osc_lock);
 417         return status;
 418 }
 419 EXPORT_SYMBOL(acpi_pci_osc_control_set);
 420
 421 static int __devinit acpi_pci_root_add(struct acpi_device *device)
 422 {
 423         unsigned long long segment, bus;
 424         acpi_status status;
 425         int result;
 426         struct acpi_pci_root *root;
 427         acpi_handle handle;
 428         struct acpi_device *child;
 429         u32 flags, base_flags;
 430
 431         segment = 0;
 432         status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
 433                                        &segment);
 434         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 435                 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
 436                 return -ENODEV;
 437         }
 438
 439         /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
 440         bus = 0;
 441         status = try_get_root_bridge_busnr(device->handle, &bus);
 442         if (ACPI_FAILURE(status)) {
 443                 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,                                               NULL, &bus);
 444                 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 445                         printk(KERN_ERR PREFIX
 446                              "no bus number in _CRS and can't evaluate _BBN\n");
 447                         return -ENODEV;
 448                 }
 449         }
 450
 451         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
 452         if (!root)
 453                 return -ENOMEM;
 454
 455         INIT_LIST_HEAD(&root->node);
 456         root->device = device;
 457         root->segment = segment & 0xFFFF;
 458         root->bus_nr = bus & 0xFF;
 459         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
 460         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
 461         device->driver_data = root;
 462
 463         /*
 464          * All supported architectures that use ACPI have support for
 465          * PCI domains, so we indicate this in _OSC support capabilities.
 466          */
 467         flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
 468         acpi_pci_osc_support(root, flags);
 469
 470         /*
 471          * TBD: Need PCI interface for enumeration/configuration of roots.
 472          */
 473
 474         /* TBD: Locking */
 475         list_add_tail(&root->node, &acpi_pci_roots);
 476
 477         printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
 478                acpi_device_name(device), acpi_device_bid(device),
 479                root->segment, root->bus_nr);
 480
 481         /*
 482          * Scan the Root Bridge
 483          * --------------------
 484          * Must do this prior to any attempt to bind the root device, as the
 485          * PCI namespace does not get created until this call is made (and
 486          * thus the root bridge's pci_dev does not exist).
 487          */
 488         root->bus = pci_acpi_scan_root(device, segment, bus);
 489         if (!root->bus) {
 490                 printk(KERN_ERR PREFIX
 491                             "Bus %04x:%02x not present in PCI namespace\n",
 492                             root->segment, root->bus_nr);
 493                 result = -ENODEV;
 494                 goto end;
 495         }
 496
 497         /*
 498          * Attach ACPI-PCI Context
 499          * -----------------------
 500          * Thus binding the ACPI and PCI devices.
 501          */
 502         result = acpi_pci_bind_root(device);
 503         if (result)
 504                 goto end;
 505
 506         /*
 507          * PCI Routing Table
 508          * -----------------
 509          * Evaluate and parse _PRT, if exists.
 510          */
 511         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 512         if (ACPI_SUCCESS(status))
 513                 result = acpi_pci_irq_add_prt(device->handle, root->bus);
 514
 515         /*
 516          * Scan and bind all _ADR-Based Devices
 517          */
 518         list_for_each_entry(child, &device->children, node)
 519                 acpi_pci_bridge_scan(child);
 520
 521         /* Indicate support for various _OSC capabilities. */
 522         if (pci_ext_cfg_avail(root->bus->self))
 523                 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
 524         if (pcie_aspm_enabled())
 525                 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
 526                         OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
 527         if (pci_msi_enabled())
 528                 flags |= OSC_MSI_SUPPORT;
 529         if (flags != base_flags)
 530                 acpi_pci_osc_support(root, flags);
 531
 532         pci_acpi_add_bus_pm_notifier(device, root->bus);
 533         if (device->wakeup.flags.run_wake)
 534                 device_set_run_wake(root->bus->bridge, true);
 535
 536         return 0;
 537
 538 end:
 539         if (!list_empty(&root->node))
 540                 list_del(&root->node);
 541         kfree(root);
 542         return result;
 543 }
 544
 545 static int acpi_pci_root_start(struct acpi_device *device)
 546 {
 547         struct acpi_pci_root *root = acpi_driver_data(device);
 548
 549         pci_bus_add_devices(root->bus);
 550         return 0;
 551 }
 552
 553 static int acpi_pci_root_remove(struct acpi_device *device, int type)
 554 {
 555         struct acpi_pci_root *root = acpi_driver_data(device);
 556
 557         device_set_run_wake(root->bus->bridge, false);
 558         pci_acpi_remove_bus_pm_notifier(device);
 559
 560         kfree(root);
 561         return 0;
 562 }
 563
 564 static int __init acpi_pci_root_init(void)
 565 {
 566         if (acpi_pci_disabled)
 567                 return 0;
 568
 569         pci_acpi_crs_quirks();
 570         if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
 571                 return -ENODEV;
 572
 573         return 0;
 574 }
 575
 576 subsys_initcall(acpi_pci_root_init);