2 * drivers/pci/pci-driver.c
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/device.h>
10 #include <linux/mempolicy.h>
14 * Registration of PCI drivers and handling of hot-pluggable devices.
18 * Dynamic device IDs are disabled for !CONFIG_HOTPLUG
22 struct list_head node;
23 struct pci_device_id id;
29 * store_new_id - add a new PCI device ID to this driver and re-probe devices
30 * @driver: target device driver
31 * @buf: buffer for scanning device ID data
34 * Adds a new dynamic pci device ID to this driver,
35 * and causes the driver to probe for all devices again.
38 store_new_id(struct device_driver *driver, const char *buf, size_t count)
40 struct pci_dynid *dynid;
41 struct pci_driver *pdrv = to_pci_driver(driver);
42 __u32 vendor=PCI_ANY_ID, device=PCI_ANY_ID, subvendor=PCI_ANY_ID,
43 subdevice=PCI_ANY_ID, class=0, class_mask=0;
44 unsigned long driver_data=0;
47 fields = sscanf(buf, "%x %x %x %x %x %x %lux",
48 &vendor, &device, &subvendor, &subdevice,
49 &class, &class_mask, &driver_data);
53 dynid = kmalloc(sizeof(*dynid), GFP_KERNEL);
57 memset(dynid, 0, sizeof(*dynid));
58 INIT_LIST_HEAD(&dynid->node);
59 dynid->id.vendor = vendor;
60 dynid->id.device = device;
61 dynid->id.subvendor = subvendor;
62 dynid->id.subdevice = subdevice;
63 dynid->id.class = class;
64 dynid->id.class_mask = class_mask;
65 dynid->id.driver_data = pdrv->dynids.use_driver_data ?
68 spin_lock(&pdrv->dynids.lock);
69 list_add_tail(&pdrv->dynids.list, &dynid->node);
70 spin_unlock(&pdrv->dynids.lock);
72 if (get_driver(&pdrv->driver)) {
73 driver_attach(&pdrv->driver);
74 put_driver(&pdrv->driver);
79 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
82 pci_free_dynids(struct pci_driver *drv)
84 struct pci_dynid *dynid, *n;
86 spin_lock(&drv->dynids.lock);
87 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
88 list_del(&dynid->node);
91 spin_unlock(&drv->dynids.lock);
95 pci_create_newid_file(struct pci_driver *drv)
98 if (drv->probe != NULL)
99 error = sysfs_create_file(&drv->driver.kobj,
100 &driver_attr_new_id.attr);
104 #else /* !CONFIG_HOTPLUG */
105 static inline void pci_free_dynids(struct pci_driver *drv) {}
106 static inline int pci_create_newid_file(struct pci_driver *drv)
113 * pci_match_id - See if a pci device matches a given pci_id table
114 * @ids: array of PCI device id structures to search in
115 * @dev: the PCI device structure to match against.
117 * Used by a driver to check whether a PCI device present in the
118 * system is in its list of supported devices. Returns the matching
119 * pci_device_id structure or %NULL if there is no match.
121 * Depreciated, don't use this as it will not catch any dynamic ids
122 * that a driver might want to check for.
124 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
128 while (ids->vendor || ids->subvendor || ids->class_mask) {
129 if (pci_match_one_device(ids, dev))
138 * pci_match_device - Tell if a PCI device structure has a matching
139 * PCI device id structure
140 * @ids: array of PCI device id structures to search in
141 * @dev: the PCI device structure to match against
142 * @drv: the PCI driver to match against
144 * Used by a driver to check whether a PCI device present in the
145 * system is in its list of supported devices. Returns the matching
146 * pci_device_id structure or %NULL if there is no match.
148 const struct pci_device_id *pci_match_device(struct pci_driver *drv,
151 const struct pci_device_id *id;
152 struct pci_dynid *dynid;
154 id = pci_match_id(drv->id_table, dev);
158 /* static ids didn't match, lets look at the dynamic ones */
159 spin_lock(&drv->dynids.lock);
160 list_for_each_entry(dynid, &drv->dynids.list, node) {
161 if (pci_match_one_device(&dynid->id, dev)) {
162 spin_unlock(&drv->dynids.lock);
166 spin_unlock(&drv->dynids.lock);
170 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
171 const struct pci_device_id *id)
175 /* Execute driver initialization on node where the
176 device's bus is attached to. This way the driver likely
177 allocates its local memory on the right node without
178 any need to change it. */
179 struct mempolicy *oldpol;
180 cpumask_t oldmask = current->cpus_allowed;
181 int node = pcibus_to_node(dev->bus);
182 if (node >= 0 && node_online(node))
183 set_cpus_allowed(current, node_to_cpumask(node));
184 /* And set default memory allocation policy */
185 oldpol = current->mempolicy;
186 current->mempolicy = &default_policy;
187 mpol_get(current->mempolicy);
189 error = drv->probe(dev, id);
191 set_cpus_allowed(current, oldmask);
192 mpol_free(current->mempolicy);
193 current->mempolicy = oldpol;
199 * __pci_device_probe()
200 * @drv: driver to call to check if it wants the PCI device
201 * @pci_dev: PCI device being probed
203 * returns 0 on success, else error.
204 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
207 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
209 const struct pci_device_id *id;
212 if (!pci_dev->driver && drv->probe) {
215 id = pci_match_device(drv, pci_dev);
217 error = pci_call_probe(drv, pci_dev, id);
219 pci_dev->driver = drv;
226 static int pci_device_probe(struct device * dev)
229 struct pci_driver *drv;
230 struct pci_dev *pci_dev;
232 drv = to_pci_driver(dev->driver);
233 pci_dev = to_pci_dev(dev);
234 pci_dev_get(pci_dev);
235 error = __pci_device_probe(drv, pci_dev);
237 pci_dev_put(pci_dev);
242 static int pci_device_remove(struct device * dev)
244 struct pci_dev * pci_dev = to_pci_dev(dev);
245 struct pci_driver * drv = pci_dev->driver;
249 drv->remove(pci_dev);
250 pci_dev->driver = NULL;
254 * We would love to complain here if pci_dev->is_enabled is set, that
255 * the driver should have called pci_disable_device(), but the
256 * unfortunate fact is there are too many odd BIOS and bridge setups
257 * that don't like drivers doing that all of the time.
258 * Oh well, we can dream of sane hardware when we sleep, no matter how
259 * horrible the crap we have to deal with is when we are awake...
262 pci_dev_put(pci_dev);
266 static int pci_device_suspend(struct device * dev, pm_message_t state)
268 struct pci_dev * pci_dev = to_pci_dev(dev);
269 struct pci_driver * drv = pci_dev->driver;
272 if (drv && drv->suspend)
273 i = drv->suspend(pci_dev, state);
275 pci_save_state(pci_dev);
281 * Default resume method for devices that have no driver provided resume,
282 * or not even a driver at all.
284 static void pci_default_resume(struct pci_dev *pci_dev)
288 /* restore the PCI config space */
289 pci_restore_state(pci_dev);
290 /* if the device was enabled before suspend, reenable */
291 if (pci_dev->is_enabled)
292 retval = pci_enable_device(pci_dev);
293 /* if the device was busmaster before the suspend, make it busmaster again */
294 if (pci_dev->is_busmaster)
295 pci_set_master(pci_dev);
298 static int pci_device_resume(struct device * dev)
300 struct pci_dev * pci_dev = to_pci_dev(dev);
301 struct pci_driver * drv = pci_dev->driver;
303 if (drv && drv->resume)
304 drv->resume(pci_dev);
306 pci_default_resume(pci_dev);
310 static void pci_device_shutdown(struct device *dev)
312 struct pci_dev *pci_dev = to_pci_dev(dev);
313 struct pci_driver *drv = pci_dev->driver;
315 if (drv && drv->shutdown)
316 drv->shutdown(pci_dev);
319 #define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj)
320 #define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr)
323 pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
325 struct device_driver *driver = kobj_to_pci_driver(kobj);
326 struct driver_attribute *dattr = attr_to_driver_attribute(attr);
329 if (!get_driver(driver))
332 ret = dattr->show ? dattr->show(driver, buf) : -EIO;
339 pci_driver_attr_store(struct kobject * kobj, struct attribute *attr,
340 const char *buf, size_t count)
342 struct device_driver *driver = kobj_to_pci_driver(kobj);
343 struct driver_attribute *dattr = attr_to_driver_attribute(attr);
346 if (!get_driver(driver))
349 ret = dattr->store ? dattr->store(driver, buf, count) : -EIO;
355 static struct sysfs_ops pci_driver_sysfs_ops = {
356 .show = pci_driver_attr_show,
357 .store = pci_driver_attr_store,
359 static struct kobj_type pci_driver_kobj_type = {
360 .sysfs_ops = &pci_driver_sysfs_ops,
364 * pci_register_driver - register a new pci driver
365 * @drv: the driver structure to register
367 * Adds the driver structure to the list of registered drivers.
368 * Returns a negative value on error, otherwise 0.
369 * If no error occurred, the driver remains registered even if
370 * no device was claimed during registration.
372 int pci_register_driver(struct pci_driver *drv)
376 /* initialize common driver fields */
377 drv->driver.name = drv->name;
378 drv->driver.bus = &pci_bus_type;
379 drv->driver.probe = pci_device_probe;
380 drv->driver.remove = pci_device_remove;
381 /* FIXME, once all of the existing PCI drivers have been fixed to set
382 * the pci shutdown function, this test can go away. */
383 if (!drv->driver.shutdown)
384 drv->driver.shutdown = pci_device_shutdown;
386 printk(KERN_WARNING "Warning: PCI driver %s has a struct "
387 "device_driver shutdown method, please update!\n",
389 drv->driver.owner = drv->owner;
390 drv->driver.kobj.ktype = &pci_driver_kobj_type;
392 spin_lock_init(&drv->dynids.lock);
393 INIT_LIST_HEAD(&drv->dynids.list);
395 /* register with core */
396 error = driver_register(&drv->driver);
399 error = pci_create_newid_file(drv);
405 * pci_unregister_driver - unregister a pci driver
406 * @drv: the driver structure to unregister
408 * Deletes the driver structure from the list of registered PCI drivers,
409 * gives it a chance to clean up by calling its remove() function for
410 * each device it was responsible for, and marks those devices as
415 pci_unregister_driver(struct pci_driver *drv)
417 driver_unregister(&drv->driver);
418 pci_free_dynids(drv);
421 static struct pci_driver pci_compat_driver = {
426 * pci_dev_driver - get the pci_driver of a device
427 * @dev: the device to query
429 * Returns the appropriate pci_driver structure or %NULL if there is no
430 * registered driver for the device.
433 pci_dev_driver(const struct pci_dev *dev)
439 for(i=0; i<=PCI_ROM_RESOURCE; i++)
440 if (dev->resource[i].flags & IORESOURCE_BUSY)
441 return &pci_compat_driver;
447 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
448 * @dev: the PCI device structure to match against
449 * @drv: the device driver to search for matching PCI device id structures
451 * Used by a driver to check whether a PCI device present in the
452 * system is in its list of supported devices. Returns the matching
453 * pci_device_id structure or %NULL if there is no match.
455 static int pci_bus_match(struct device *dev, struct device_driver *drv)
457 struct pci_dev *pci_dev = to_pci_dev(dev);
458 struct pci_driver *pci_drv = to_pci_driver(drv);
459 const struct pci_device_id *found_id;
461 found_id = pci_match_device(pci_drv, pci_dev);
469 * pci_dev_get - increments the reference count of the pci device structure
470 * @dev: the device being referenced
472 * Each live reference to a device should be refcounted.
474 * Drivers for PCI devices should normally record such references in
475 * their probe() methods, when they bind to a device, and release
476 * them by calling pci_dev_put(), in their disconnect() methods.
478 * A pointer to the device with the incremented reference counter is returned.
480 struct pci_dev *pci_dev_get(struct pci_dev *dev)
483 get_device(&dev->dev);
488 * pci_dev_put - release a use of the pci device structure
489 * @dev: device that's been disconnected
491 * Must be called when a user of a device is finished with it. When the last
492 * user of the device calls this function, the memory of the device is freed.
494 void pci_dev_put(struct pci_dev *dev)
497 put_device(&dev->dev);
500 #ifndef CONFIG_HOTPLUG
501 int pci_hotplug (struct device *dev, char **envp, int num_envp,
502 char *buffer, int buffer_size)
508 struct bus_type pci_bus_type = {
510 .match = pci_bus_match,
511 .hotplug = pci_hotplug,
512 .suspend = pci_device_suspend,
513 .resume = pci_device_resume,
514 .dev_attrs = pci_dev_attrs,
517 static int __init pci_driver_init(void)
519 return bus_register(&pci_bus_type);
522 postcore_initcall(pci_driver_init);
524 EXPORT_SYMBOL(pci_match_id);
525 EXPORT_SYMBOL(pci_match_device);
526 EXPORT_SYMBOL(pci_register_driver);
527 EXPORT_SYMBOL(pci_unregister_driver);
528 EXPORT_SYMBOL(pci_dev_driver);
529 EXPORT_SYMBOL(pci_bus_type);
530 EXPORT_SYMBOL(pci_dev_get);
531 EXPORT_SYMBOL(pci_dev_put);