drivers/acpi/pci_bind.c

   1 /*
   2  *  pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
   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/pci.h>
  34 #include <linux/acpi.h>
  35 #include <acpi/acpi_bus.h>
  36 #include <acpi/acpi_drivers.h>
  37
  38 #define _COMPONENT              ACPI_PCI_COMPONENT
  39 ACPI_MODULE_NAME("pci_bind")
  40
  41 struct acpi_pci_data {
  42         struct acpi_pci_id id;
  43         struct pci_bus *bus;
  44         struct pci_dev *dev;
  45 };
  46
  47 static void acpi_pci_data_handler(acpi_handle handle, u32 function,
  48                                   void *context)
  49 {
  50         ACPI_FUNCTION_TRACE("acpi_pci_data_handler");
  51
  52         /* TBD: Anything we need to do here? */
  53
  54         return_VOID;
  55 }
  56
  57 /**
  58  * acpi_get_pci_id
  59  * ------------------
  60  * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
  61  * to resolve PCI information for ACPI-PCI devices defined in the namespace.
  62  * This typically occurs when resolving PCI operation region information.
  63  */
  64 acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
  65 {
  66         int result = 0;
  67         acpi_status status = AE_OK;
  68         struct acpi_device *device = NULL;
  69         struct acpi_pci_data *data = NULL;
  70
  71         ACPI_FUNCTION_TRACE("acpi_get_pci_id");
  72
  73         if (!id)
  74                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  75
  76         result = acpi_bus_get_device(handle, &device);
  77         if (result) {
  78                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  79                                   "Invalid ACPI Bus context for device %s\n",
  80                                   acpi_device_bid(device)));
  81                 return_ACPI_STATUS(AE_NOT_EXIST);
  82         }
  83
  84         status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
  85         if (ACPI_FAILURE(status) || !data) {
  86                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  87                                   "Invalid ACPI-PCI context for device %s\n",
  88                                   acpi_device_bid(device)));
  89                 return_ACPI_STATUS(status);
  90         }
  91
  92         *id = data->id;
  93
  94         /*
  95            id->segment = data->id.segment;
  96            id->bus = data->id.bus;
  97            id->device = data->id.device;
  98            id->function = data->id.function;
  99          */
 100
 101         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 102                           "Device %s has PCI address %02x:%02x:%02x.%02x\n",
 103                           acpi_device_bid(device), id->segment, id->bus,
 104                           id->device, id->function));
 105
 106         return_ACPI_STATUS(AE_OK);
 107 }
 108
 109 EXPORT_SYMBOL(acpi_get_pci_id);
 110
 111 int acpi_pci_bind(struct acpi_device *device)
 112 {
 113         int result = 0;
 114         acpi_status status = AE_OK;
 115         struct acpi_pci_data *data = NULL;
 116         struct acpi_pci_data *pdata = NULL;
 117         char *pathname = NULL;
 118         struct acpi_buffer buffer = { 0, NULL };
 119         acpi_handle handle = NULL;
 120         struct pci_dev *dev;
 121         struct pci_bus *bus;
 122
 123         ACPI_FUNCTION_TRACE("acpi_pci_bind");
 124
 125         if (!device || !device->parent)
 126                 return_VALUE(-EINVAL);
 127
 128         pathname = kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 129         if (!pathname)
 130                 return_VALUE(-ENOMEM);
 131         memset(pathname, 0, ACPI_PATHNAME_MAX);
 132         buffer.length = ACPI_PATHNAME_MAX;
 133         buffer.pointer = pathname;
 134
 135         data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 136         if (!data) {
 137                 kfree(pathname);
 138                 return_VALUE(-ENOMEM);
 139         }
 140         memset(data, 0, sizeof(struct acpi_pci_data));
 141
 142         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 143         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
 144                           pathname));
 145
 146         /*
 147          * Segment & Bus
 148          * -------------
 149          * These are obtained via the parent device's ACPI-PCI context.
 150          */
 151         status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
 152                                (void **)&pdata);
 153         if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
 154                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 155                                   "Invalid ACPI-PCI context for parent device %s\n",
 156                                   acpi_device_bid(device->parent)));
 157                 result = -ENODEV;
 158                 goto end;
 159         }
 160         data->id.segment = pdata->id.segment;
 161         data->id.bus = pdata->bus->number;
 162
 163         /*
 164          * Device & Function
 165          * -----------------
 166          * These are simply obtained from the device's _ADR method.  Note
 167          * that a value of zero is valid.
 168          */
 169         data->id.device = device->pnp.bus_address >> 16;
 170         data->id.function = device->pnp.bus_address & 0xFFFF;
 171
 172         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
 173                           data->id.segment, data->id.bus, data->id.device,
 174                           data->id.function));
 175
 176         /*
 177          * TBD: Support slot devices (e.g. function=0xFFFF).
 178          */
 179
 180         /*
 181          * Locate PCI Device
 182          * -----------------
 183          * Locate matching device in PCI namespace.  If it doesn't exist
 184          * this typically means that the device isn't currently inserted
 185          * (e.g. docking station, port replicator, etc.).
 186          * We cannot simply search the global pci device list, since
 187          * PCI devices are added to the global pci list when the root
 188          * bridge start ops are run, which may not have happened yet.
 189          */
 190         bus = pci_find_bus(data->id.segment, data->id.bus);
 191         if (bus) {
 192                 list_for_each_entry(dev, &bus->devices, bus_list) {
 193                         if (dev->devfn == PCI_DEVFN(data->id.device,
 194                                                     data->id.function)) {
 195                                 data->dev = dev;
 196                                 break;
 197                         }
 198                 }
 199         }
 200         if (!data->dev) {
 201                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 202                                   "Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
 203                                   data->id.segment, data->id.bus,
 204                                   data->id.device, data->id.function));
 205                 result = -ENODEV;
 206                 goto end;
 207         }
 208         if (!data->dev->bus) {
 209                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 210                                   "Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
 211                                   data->id.segment, data->id.bus,
 212                                   data->id.device, data->id.function));
 213                 result = -ENODEV;
 214                 goto end;
 215         }
 216
 217         /*
 218          * PCI Bridge?
 219          * -----------
 220          * If so, set the 'bus' field and install the 'bind' function to
 221          * facilitate callbacks for all of its children.
 222          */
 223         if (data->dev->subordinate) {
 224                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 225                                   "Device %02x:%02x:%02x.%02x is a PCI bridge\n",
 226                                   data->id.segment, data->id.bus,
 227                                   data->id.device, data->id.function));
 228                 data->bus = data->dev->subordinate;
 229                 device->ops.bind = acpi_pci_bind;
 230                 device->ops.unbind = acpi_pci_unbind;
 231         }
 232
 233         /*
 234          * Attach ACPI-PCI Context
 235          * -----------------------
 236          * Thus binding the ACPI and PCI devices.
 237          */
 238         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 239         if (ACPI_FAILURE(status)) {
 240                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 241                                   "Unable to attach ACPI-PCI context to device %s\n",
 242                                   acpi_device_bid(device)));
 243                 result = -ENODEV;
 244                 goto end;
 245         }
 246
 247         /*
 248          * PCI Routing Table
 249          * -----------------
 250          * Evaluate and parse _PRT, if exists.  This code is independent of
 251          * PCI bridges (above) to allow parsing of _PRT objects within the
 252          * scope of non-bridge devices.  Note that _PRTs within the scope of
 253          * a PCI bridge assume the bridge's subordinate bus number.
 254          *
 255          * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
 256          */
 257         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 258         if (ACPI_SUCCESS(status)) {
 259                 if (data->bus)  /* PCI-PCI bridge */
 260                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
 261                                              data->bus->number);
 262                 else            /* non-bridge PCI device */
 263                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
 264                                              data->id.bus);
 265         }
 266
 267       end:
 268         kfree(pathname);
 269         if (result)
 270                 kfree(data);
 271
 272         return_VALUE(result);
 273 }
 274
 275 int acpi_pci_unbind(struct acpi_device *device)
 276 {
 277         int result = 0;
 278         acpi_status status = AE_OK;
 279         struct acpi_pci_data *data = NULL;
 280         char *pathname = NULL;
 281         struct acpi_buffer buffer = { 0, NULL };
 282
 283         ACPI_FUNCTION_TRACE("acpi_pci_unbind");
 284
 285         if (!device || !device->parent)
 286                 return_VALUE(-EINVAL);
 287
 288         pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 289         if (!pathname)
 290                 return_VALUE(-ENOMEM);
 291         memset(pathname, 0, ACPI_PATHNAME_MAX);
 292
 293         buffer.length = ACPI_PATHNAME_MAX;
 294         buffer.pointer = pathname;
 295         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 296         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
 297                           pathname));
 298         kfree(pathname);
 299
 300         status =
 301             acpi_get_data(device->handle, acpi_pci_data_handler,
 302                           (void **)&data);
 303         if (ACPI_FAILURE(status)) {
 304                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 305                                   "Unable to get data from device %s\n",
 306                                   acpi_device_bid(device)));
 307                 result = -ENODEV;
 308                 goto end;
 309         }
 310
 311         status = acpi_detach_data(device->handle, acpi_pci_data_handler);
 312         if (ACPI_FAILURE(status)) {
 313                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 314                                   "Unable to detach data from device %s\n",
 315                                   acpi_device_bid(device)));
 316                 result = -ENODEV;
 317                 goto end;
 318         }
 319         if (data->dev->subordinate) {
 320                 acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
 321         }
 322         kfree(data);
 323
 324       end:
 325         return_VALUE(result);
 326 }
 327
 328 int
 329 acpi_pci_bind_root(struct acpi_device *device,
 330                    struct acpi_pci_id *id, struct pci_bus *bus)
 331 {
 332         int result = 0;
 333         acpi_status status = AE_OK;
 334         struct acpi_pci_data *data = NULL;
 335         char *pathname = NULL;
 336         struct acpi_buffer buffer = { 0, NULL };
 337
 338         ACPI_FUNCTION_TRACE("acpi_pci_bind_root");
 339
 340         pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 341         if (!pathname)
 342                 return_VALUE(-ENOMEM);
 343         memset(pathname, 0, ACPI_PATHNAME_MAX);
 344
 345         buffer.length = ACPI_PATHNAME_MAX;
 346         buffer.pointer = pathname;
 347
 348         if (!device || !id || !bus) {
 349                 kfree(pathname);
 350                 return_VALUE(-EINVAL);
 351         }
 352
 353         data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 354         if (!data) {
 355                 kfree(pathname);
 356                 return_VALUE(-ENOMEM);
 357         }
 358         memset(data, 0, sizeof(struct acpi_pci_data));
 359
 360         data->id = *id;
 361         data->bus = bus;
 362         device->ops.bind = acpi_pci_bind;
 363         device->ops.unbind = acpi_pci_unbind;
 364
 365         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 366
 367         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
 368                           "%02x:%02x\n", pathname, id->segment, id->bus));
 369
 370         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 371         if (ACPI_FAILURE(status)) {
 372                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 373                                   "Unable to attach ACPI-PCI context to device %s\n",
 374                                   pathname));
 375                 result = -ENODEV;
 376                 goto end;
 377         }
 378
 379       end:
 380         kfree(pathname);
 381         if (result != 0)
 382                 kfree(data);
 383
 384         return_VALUE(result);
 385 }