drivers/pci/pci-driver.c

   1 /*
   2  * drivers/pci/pci-driver.c
   3  *
   4  */
   5
   6 #include <linux/pci.h>
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9 #include <linux/device.h>
  10 #include <linux/mempolicy.h>
  11 #include "pci.h"
  12
  13 /*
  14  *  Registration of PCI drivers and handling of hot-pluggable devices.
  15  */
  16
  17 /*
  18  * Dynamic device IDs are disabled for !CONFIG_HOTPLUG
  19  */
  20
  21 struct pci_dynid {
  22         struct list_head node;
  23         struct pci_device_id id;
  24 };
  25
  26 #ifdef CONFIG_HOTPLUG
  27
  28 /**
  29  * store_new_id
  30  *
  31  * Adds a new dynamic pci device ID to this driver,
  32  * and causes the driver to probe for all devices again.
  33  */
  34 static inline ssize_t
  35 store_new_id(struct device_driver *driver, const char *buf, size_t count)
  36 {
  37         struct pci_dynid *dynid;
  38         struct pci_driver *pdrv = to_pci_driver(driver);
  39         __u32 vendor=PCI_ANY_ID, device=PCI_ANY_ID, subvendor=PCI_ANY_ID,
  40                 subdevice=PCI_ANY_ID, class=0, class_mask=0;
  41         unsigned long driver_data=0;
  42         int fields=0;
  43
  44         fields = sscanf(buf, "%x %x %x %x %x %x %lux",
  45                         &vendor, &device, &subvendor, &subdevice,
  46                         &class, &class_mask, &driver_data);
  47         if (fields < 0)
  48                 return -EINVAL;
  49
  50         dynid = kmalloc(sizeof(*dynid), GFP_KERNEL);
  51         if (!dynid)
  52                 return -ENOMEM;
  53
  54         memset(dynid, 0, sizeof(*dynid));
  55         INIT_LIST_HEAD(&dynid->node);
  56         dynid->id.vendor = vendor;
  57         dynid->id.device = device;
  58         dynid->id.subvendor = subvendor;
  59         dynid->id.subdevice = subdevice;
  60         dynid->id.class = class;
  61         dynid->id.class_mask = class_mask;
  62         dynid->id.driver_data = pdrv->dynids.use_driver_data ?
  63                 driver_data : 0UL;
  64
  65         spin_lock(&pdrv->dynids.lock);
  66         list_add_tail(&pdrv->dynids.list, &dynid->node);
  67         spin_unlock(&pdrv->dynids.lock);
  68
  69         if (get_driver(&pdrv->driver)) {
  70                 driver_attach(&pdrv->driver);
  71                 put_driver(&pdrv->driver);
  72         }
  73
  74         return count;
  75 }
  76 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
  77
  78 static void
  79 pci_free_dynids(struct pci_driver *drv)
  80 {
  81         struct pci_dynid *dynid, *n;
  82
  83         spin_lock(&drv->dynids.lock);
  84         list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
  85                 list_del(&dynid->node);
  86                 kfree(dynid);
  87         }
  88         spin_unlock(&drv->dynids.lock);
  89 }
  90
  91 static int
  92 pci_create_newid_file(struct pci_driver *drv)
  93 {
  94         int error = 0;
  95         if (drv->probe != NULL)
  96                 error = sysfs_create_file(&drv->driver.kobj,
  97                                           &driver_attr_new_id.attr);
  98         return error;
  99 }
 100
 101 #else /* !CONFIG_HOTPLUG */
 102 static inline void pci_free_dynids(struct pci_driver *drv) {}
 103 static inline int pci_create_newid_file(struct pci_driver *drv)
 104 {
 105         return 0;
 106 }
 107 #endif
 108
 109 /**
 110  * pci_match_id - See if a pci device matches a given pci_id table
 111  * @ids: array of PCI device id structures to search in
 112  * @dev: the PCI device structure to match against.
 113  *
 114  * Used by a driver to check whether a PCI device present in the
 115  * system is in its list of supported devices.  Returns the matching
 116  * pci_device_id structure or %NULL if there is no match.
 117  *
 118  * Depreciated, don't use this as it will not catch any dynamic ids
 119  * that a driver might want to check for.
 120  */
 121 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
 122                                          struct pci_dev *dev)
 123 {
 124         if (ids) {
 125                 while (ids->vendor || ids->subvendor || ids->class_mask) {
 126                         if (pci_match_one_device(ids, dev))
 127                                 return ids;
 128                         ids++;
 129                 }
 130         }
 131         return NULL;
 132 }
 133
 134 /**
 135  * pci_match_device - Tell if a PCI device structure has a matching
 136  *                    PCI device id structure
 137  * @ids: array of PCI device id structures to search in
 138  * @dev: the PCI device structure to match against
 139  * @drv: the PCI driver to match against
 140  *
 141  * Used by a driver to check whether a PCI device present in the
 142  * system is in its list of supported devices.  Returns the matching
 143  * pci_device_id structure or %NULL if there is no match.
 144  */
 145 const struct pci_device_id *pci_match_device(struct pci_driver *drv,
 146                                              struct pci_dev *dev)
 147 {
 148         const struct pci_device_id *id;
 149         struct pci_dynid *dynid;
 150
 151         id = pci_match_id(drv->id_table, dev);
 152         if (id)
 153                 return id;
 154
 155         /* static ids didn't match, lets look at the dynamic ones */
 156         spin_lock(&drv->dynids.lock);
 157         list_for_each_entry(dynid, &drv->dynids.list, node) {
 158                 if (pci_match_one_device(&dynid->id, dev)) {
 159                         spin_unlock(&drv->dynids.lock);
 160                         return &dynid->id;
 161                 }
 162         }
 163         spin_unlock(&drv->dynids.lock);
 164         return NULL;
 165 }
 166
 167 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
 168                           const struct pci_device_id *id)
 169 {
 170         int error;
 171 #ifdef CONFIG_NUMA
 172         /* Execute driver initialization on node where the
 173            device's bus is attached to.  This way the driver likely
 174            allocates its local memory on the right node without
 175            any need to change it. */
 176         struct mempolicy *oldpol;
 177         cpumask_t oldmask = current->cpus_allowed;
 178         int node = pcibus_to_node(dev->bus);
 179         if (node >= 0 && node_online(node))
 180             set_cpus_allowed(current, node_to_cpumask(node));
 181         /* And set default memory allocation policy */
 182         oldpol = current->mempolicy;
 183         current->mempolicy = &default_policy;
 184         mpol_get(current->mempolicy);
 185 #endif
 186         error = drv->probe(dev, id);
 187 #ifdef CONFIG_NUMA
 188         set_cpus_allowed(current, oldmask);
 189         mpol_free(current->mempolicy);
 190         current->mempolicy = oldpol;
 191 #endif
 192         return error;
 193 }
 194
 195 /**
 196  * __pci_device_probe()
 197  *
 198  * returns 0  on success, else error.
 199  * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
 200  */
 201 static int
 202 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
 203 {
 204         const struct pci_device_id *id;
 205         int error = 0;
 206
 207         if (!pci_dev->driver && drv->probe) {
 208                 error = -ENODEV;
 209
 210                 id = pci_match_device(drv, pci_dev);
 211                 if (id)
 212                         error = pci_call_probe(drv, pci_dev, id);
 213                 if (error >= 0) {
 214                         pci_dev->driver = drv;
 215                         error = 0;
 216                 }
 217         }
 218         return error;
 219 }
 220
 221 static int pci_device_probe(struct device * dev)
 222 {
 223         int error = 0;
 224         struct pci_driver *drv;
 225         struct pci_dev *pci_dev;
 226
 227         drv = to_pci_driver(dev->driver);
 228         pci_dev = to_pci_dev(dev);
 229         pci_dev_get(pci_dev);
 230         error = __pci_device_probe(drv, pci_dev);
 231         if (error)
 232                 pci_dev_put(pci_dev);
 233
 234         return error;
 235 }
 236
 237 static int pci_device_remove(struct device * dev)
 238 {
 239         struct pci_dev * pci_dev = to_pci_dev(dev);
 240         struct pci_driver * drv = pci_dev->driver;
 241
 242         if (drv) {
 243                 if (drv->remove)
 244                         drv->remove(pci_dev);
 245                 pci_dev->driver = NULL;
 246         }
 247
 248         /*
 249          * We would love to complain here if pci_dev->is_enabled is set, that
 250          * the driver should have called pci_disable_device(), but the
 251          * unfortunate fact is there are too many odd BIOS and bridge setups
 252          * that don't like drivers doing that all of the time.
 253          * Oh well, we can dream of sane hardware when we sleep, no matter how
 254          * horrible the crap we have to deal with is when we are awake...
 255          */
 256
 257         pci_dev_put(pci_dev);
 258         return 0;
 259 }
 260
 261 static int pci_device_suspend(struct device * dev, pm_message_t state)
 262 {
 263         struct pci_dev * pci_dev = to_pci_dev(dev);
 264         struct pci_driver * drv = pci_dev->driver;
 265         int i = 0;
 266
 267         if (drv && drv->suspend)
 268                 i = drv->suspend(pci_dev, state);
 269         else
 270                 pci_save_state(pci_dev);
 271         return i;
 272 }
 273
 274
 275 /*
 276  * Default resume method for devices that have no driver provided resume,
 277  * or not even a driver at all.
 278  */
 279 static void pci_default_resume(struct pci_dev *pci_dev)
 280 {
 281         int retval;
 282
 283         /* restore the PCI config space */
 284         pci_restore_state(pci_dev);
 285         /* if the device was enabled before suspend, reenable */
 286         if (pci_dev->is_enabled)
 287                 retval = pci_enable_device(pci_dev);
 288         /* if the device was busmaster before the suspend, make it busmaster again */
 289         if (pci_dev->is_busmaster)
 290                 pci_set_master(pci_dev);
 291 }
 292
 293 static int pci_device_resume(struct device * dev)
 294 {
 295         struct pci_dev * pci_dev = to_pci_dev(dev);
 296         struct pci_driver * drv = pci_dev->driver;
 297
 298         if (drv && drv->resume)
 299                 drv->resume(pci_dev);
 300         else
 301                 pci_default_resume(pci_dev);
 302         return 0;
 303 }
 304
 305 static void pci_device_shutdown(struct device *dev)
 306 {
 307         struct pci_dev *pci_dev = to_pci_dev(dev);
 308         struct pci_driver *drv = pci_dev->driver;
 309
 310         if (drv && drv->shutdown)
 311                 drv->shutdown(pci_dev);
 312 }
 313
 314 #define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj)
 315 #define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr)
 316
 317 static ssize_t
 318 pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
 319 {
 320         struct device_driver *driver = kobj_to_pci_driver(kobj);
 321         struct driver_attribute *dattr = attr_to_driver_attribute(attr);
 322         ssize_t ret;
 323
 324         if (!get_driver(driver))
 325                 return -ENODEV;
 326
 327         ret = dattr->show ? dattr->show(driver, buf) : -EIO;
 328
 329         put_driver(driver);
 330         return ret;
 331 }
 332
 333 static ssize_t
 334 pci_driver_attr_store(struct kobject * kobj, struct attribute *attr,
 335                       const char *buf, size_t count)
 336 {
 337         struct device_driver *driver = kobj_to_pci_driver(kobj);
 338         struct driver_attribute *dattr = attr_to_driver_attribute(attr);
 339         ssize_t ret;
 340
 341         if (!get_driver(driver))
 342                 return -ENODEV;
 343
 344         ret = dattr->store ? dattr->store(driver, buf, count) : -EIO;
 345
 346         put_driver(driver);
 347         return ret;
 348 }
 349
 350 static struct sysfs_ops pci_driver_sysfs_ops = {
 351         .show = pci_driver_attr_show,
 352         .store = pci_driver_attr_store,
 353 };
 354 static struct kobj_type pci_driver_kobj_type = {
 355         .sysfs_ops = &pci_driver_sysfs_ops,
 356 };
 357
 358 /**
 359  * pci_register_driver - register a new pci driver
 360  * @drv: the driver structure to register
 361  *
 362  * Adds the driver structure to the list of registered drivers.
 363  * Returns a negative value on error, otherwise 0.
 364  * If no error occurred, the driver remains registered even if
 365  * no device was claimed during registration.
 366  */
 367 int pci_register_driver(struct pci_driver *drv)
 368 {
 369         int error;
 370
 371         /* initialize common driver fields */
 372         drv->driver.name = drv->name;
 373         drv->driver.bus = &pci_bus_type;
 374         drv->driver.probe = pci_device_probe;
 375         drv->driver.remove = pci_device_remove;
 376         /* FIXME, once all of the existing PCI drivers have been fixed to set
 377          * the pci shutdown function, this test can go away. */
 378         if (!drv->driver.shutdown)
 379                 drv->driver.shutdown = pci_device_shutdown;
 380         drv->driver.owner = drv->owner;
 381         drv->driver.kobj.ktype = &pci_driver_kobj_type;
 382
 383         spin_lock_init(&drv->dynids.lock);
 384         INIT_LIST_HEAD(&drv->dynids.list);
 385
 386         /* register with core */
 387         error = driver_register(&drv->driver);
 388
 389         if (!error)
 390                 error = pci_create_newid_file(drv);
 391
 392         return error;
 393 }
 394
 395 /**
 396  * pci_unregister_driver - unregister a pci driver
 397  * @drv: the driver structure to unregister
 398  *
 399  * Deletes the driver structure from the list of registered PCI drivers,
 400  * gives it a chance to clean up by calling its remove() function for
 401  * each device it was responsible for, and marks those devices as
 402  * driverless.
 403  */
 404
 405 void
 406 pci_unregister_driver(struct pci_driver *drv)
 407 {
 408         driver_unregister(&drv->driver);
 409         pci_free_dynids(drv);
 410 }
 411
 412 static struct pci_driver pci_compat_driver = {
 413         .name = "compat"
 414 };
 415
 416 /**
 417  * pci_dev_driver - get the pci_driver of a device
 418  * @dev: the device to query
 419  *
 420  * Returns the appropriate pci_driver structure or %NULL if there is no
 421  * registered driver for the device.
 422  */
 423 struct pci_driver *
 424 pci_dev_driver(const struct pci_dev *dev)
 425 {
 426         if (dev->driver)
 427                 return dev->driver;
 428         else {
 429                 int i;
 430                 for(i=0; i<=PCI_ROM_RESOURCE; i++)
 431                         if (dev->resource[i].flags & IORESOURCE_BUSY)
 432                                 return &pci_compat_driver;
 433         }
 434         return NULL;
 435 }
 436
 437 /**
 438  * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
 439  * @ids: array of PCI device id structures to search in
 440  * @dev: the PCI device structure to match against
 441  *
 442  * Used by a driver to check whether a PCI device present in the
 443  * system is in its list of supported devices.Returns the matching
 444  * pci_device_id structure or %NULL if there is no match.
 445  */
 446 static int pci_bus_match(struct device *dev, struct device_driver *drv)
 447 {
 448         struct pci_dev *pci_dev = to_pci_dev(dev);
 449         struct pci_driver *pci_drv = to_pci_driver(drv);
 450         const struct pci_device_id *found_id;
 451
 452         found_id = pci_match_device(pci_drv, pci_dev);
 453         if (found_id)
 454                 return 1;
 455
 456         return 0;
 457 }
 458
 459 /**
 460  * pci_dev_get - increments the reference count of the pci device structure
 461  * @dev: the device being referenced
 462  *
 463  * Each live reference to a device should be refcounted.
 464  *
 465  * Drivers for PCI devices should normally record such references in
 466  * their probe() methods, when they bind to a device, and release
 467  * them by calling pci_dev_put(), in their disconnect() methods.
 468  *
 469  * A pointer to the device with the incremented reference counter is returned.
 470  */
 471 struct pci_dev *pci_dev_get(struct pci_dev *dev)
 472 {
 473         if (dev)
 474                 get_device(&dev->dev);
 475         return dev;
 476 }
 477
 478 /**
 479  * pci_dev_put - release a use of the pci device structure
 480  * @dev: device that's been disconnected
 481  *
 482  * Must be called when a user of a device is finished with it.  When the last
 483  * user of the device calls this function, the memory of the device is freed.
 484  */
 485 void pci_dev_put(struct pci_dev *dev)
 486 {
 487         if (dev)
 488                 put_device(&dev->dev);
 489 }
 490
 491 #ifndef CONFIG_HOTPLUG
 492 int pci_hotplug (struct device *dev, char **envp, int num_envp,
 493                  char *buffer, int buffer_size)
 494 {
 495         return -ENODEV;
 496 }
 497 #endif
 498
 499 struct bus_type pci_bus_type = {
 500         .name           = "pci",
 501         .match          = pci_bus_match,
 502         .hotplug        = pci_hotplug,
 503         .suspend        = pci_device_suspend,
 504         .resume         = pci_device_resume,
 505         .dev_attrs      = pci_dev_attrs,
 506 };
 507
 508 static int __init pci_driver_init(void)
 509 {
 510         return bus_register(&pci_bus_type);
 511 }
 512
 513 postcore_initcall(pci_driver_init);
 514
 515 EXPORT_SYMBOL(pci_match_id);
 516 EXPORT_SYMBOL(pci_match_device);
 517 EXPORT_SYMBOL(pci_register_driver);
 518 EXPORT_SYMBOL(pci_unregister_driver);
 519 EXPORT_SYMBOL(pci_dev_driver);
 520 EXPORT_SYMBOL(pci_bus_type);
 521 EXPORT_SYMBOL(pci_dev_get);
 522 EXPORT_SYMBOL(pci_dev_put);