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>
11 #include <linux/string.h>
12 #include <linux/slab.h>
13 #include <linux/sched.h>
17 * Dynamic device IDs are disabled for !CONFIG_HOTPLUG
21 struct list_head node;
22 struct pci_device_id id;
28 * store_new_id - add a new PCI device ID to this driver and re-probe devices
29 * @driver: target device driver
30 * @buf: buffer for scanning device ID data
33 * Adds a new dynamic pci device ID to this driver,
34 * and causes the driver to probe for all devices again.
37 store_new_id(struct device_driver *driver, const char *buf, size_t count)
39 struct pci_dynid *dynid;
40 struct pci_driver *pdrv = to_pci_driver(driver);
41 __u32 vendor, device, subvendor=PCI_ANY_ID,
42 subdevice=PCI_ANY_ID, class=0, class_mask=0;
43 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 = kzalloc(sizeof(*dynid), GFP_KERNEL);
57 dynid->id.vendor = vendor;
58 dynid->id.device = device;
59 dynid->id.subvendor = subvendor;
60 dynid->id.subdevice = subdevice;
61 dynid->id.class = class;
62 dynid->id.class_mask = class_mask;
63 dynid->id.driver_data = pdrv->dynids.use_driver_data ?
66 spin_lock(&pdrv->dynids.lock);
67 list_add_tail(&dynid->node, &pdrv->dynids.list);
68 spin_unlock(&pdrv->dynids.lock);
70 if (get_driver(&pdrv->driver)) {
71 retval = driver_attach(&pdrv->driver);
72 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 * Deprecated, 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 PCI device id structure
139 * @drv: the PCI driver to match against
140 * @dev: the PCI device structure to match against
142 * Used by a driver to check whether a PCI device present in the
143 * system is in its list of supported devices. Returns the matching
144 * pci_device_id structure or %NULL if there is no match.
146 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
149 struct pci_dynid *dynid;
151 /* Look at the dynamic ids first, before the static ones */
152 spin_lock(&drv->dynids.lock);
153 list_for_each_entry(dynid, &drv->dynids.list, node) {
154 if (pci_match_one_device(&dynid->id, dev)) {
155 spin_unlock(&drv->dynids.lock);
159 spin_unlock(&drv->dynids.lock);
161 return pci_match_id(drv->id_table, dev);
164 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
165 const struct pci_device_id *id)
169 /* Execute driver initialization on node where the
170 device's bus is attached to. This way the driver likely
171 allocates its local memory on the right node without
172 any need to change it. */
173 struct mempolicy *oldpol;
174 cpumask_t oldmask = current->cpus_allowed;
175 int node = pcibus_to_node(dev->bus);
176 if (node >= 0 && node_online(node))
177 set_cpus_allowed(current, node_to_cpumask(node));
178 /* And set default memory allocation policy */
179 oldpol = current->mempolicy;
180 current->mempolicy = &default_policy;
181 mpol_get(current->mempolicy);
183 error = drv->probe(dev, id);
185 set_cpus_allowed(current, oldmask);
186 mpol_free(current->mempolicy);
187 current->mempolicy = oldpol;
193 * __pci_device_probe()
194 * @drv: driver to call to check if it wants the PCI device
195 * @pci_dev: PCI device being probed
197 * returns 0 on success, else error.
198 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
201 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
203 const struct pci_device_id *id;
206 if (!pci_dev->driver && drv->probe) {
209 id = pci_match_device(drv, pci_dev);
211 error = pci_call_probe(drv, pci_dev, id);
213 pci_dev->driver = drv;
220 static int pci_device_probe(struct device * dev)
223 struct pci_driver *drv;
224 struct pci_dev *pci_dev;
226 drv = to_pci_driver(dev->driver);
227 pci_dev = to_pci_dev(dev);
228 pci_dev_get(pci_dev);
229 error = __pci_device_probe(drv, pci_dev);
231 pci_dev_put(pci_dev);
236 static int pci_device_remove(struct device * dev)
238 struct pci_dev * pci_dev = to_pci_dev(dev);
239 struct pci_driver * drv = pci_dev->driver;
243 drv->remove(pci_dev);
244 pci_dev->driver = NULL;
248 * If the device is still on, set the power state as "unknown",
249 * since it might change by the next time we load the driver.
251 if (pci_dev->current_state == PCI_D0)
252 pci_dev->current_state = PCI_UNKNOWN;
255 * We would love to complain here if pci_dev->is_enabled is set, that
256 * the driver should have called pci_disable_device(), but the
257 * unfortunate fact is there are too many odd BIOS and bridge setups
258 * that don't like drivers doing that all of the time.
259 * Oh well, we can dream of sane hardware when we sleep, no matter how
260 * horrible the crap we have to deal with is when we are awake...
263 pci_dev_put(pci_dev);
267 static int pci_device_suspend(struct device * dev, pm_message_t state)
269 struct pci_dev * pci_dev = to_pci_dev(dev);
270 struct pci_driver * drv = pci_dev->driver;
273 if (drv && drv->suspend) {
274 i = drv->suspend(pci_dev, state);
275 suspend_report_result(drv->suspend, i);
277 pci_save_state(pci_dev);
279 * mark its power state as "unknown", since we don't know if
280 * e.g. the BIOS will change its device state when we suspend.
282 if (pci_dev->current_state == PCI_D0)
283 pci_dev->current_state = PCI_UNKNOWN;
288 static int pci_device_suspend_late(struct device * dev, pm_message_t state)
290 struct pci_dev * pci_dev = to_pci_dev(dev);
291 struct pci_driver * drv = pci_dev->driver;
294 if (drv && drv->suspend_late) {
295 i = drv->suspend_late(pci_dev, state);
296 suspend_report_result(drv->suspend_late, i);
302 * Default resume method for devices that have no driver provided resume,
303 * or not even a driver at all.
305 static int pci_default_resume(struct pci_dev *pci_dev)
309 /* restore the PCI config space */
310 pci_restore_state(pci_dev);
311 /* if the device was enabled before suspend, reenable */
312 retval = pci_reenable_device(pci_dev);
313 /* if the device was busmaster before the suspend, make it busmaster again */
314 if (pci_dev->is_busmaster)
315 pci_set_master(pci_dev);
320 static int pci_device_resume(struct device * dev)
323 struct pci_dev * pci_dev = to_pci_dev(dev);
324 struct pci_driver * drv = pci_dev->driver;
326 if (drv && drv->resume)
327 error = drv->resume(pci_dev);
329 error = pci_default_resume(pci_dev);
333 static int pci_device_resume_early(struct device * dev)
336 struct pci_dev * pci_dev = to_pci_dev(dev);
337 struct pci_driver * drv = pci_dev->driver;
339 pci_fixup_device(pci_fixup_resume, pci_dev);
341 if (drv && drv->resume_early)
342 error = drv->resume_early(pci_dev);
346 static void pci_device_shutdown(struct device *dev)
348 struct pci_dev *pci_dev = to_pci_dev(dev);
349 struct pci_driver *drv = pci_dev->driver;
351 if (drv && drv->shutdown)
352 drv->shutdown(pci_dev);
355 #define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj)
356 #define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr)
359 pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
361 struct device_driver *driver = kobj_to_pci_driver(kobj);
362 struct driver_attribute *dattr = attr_to_driver_attribute(attr);
365 if (!get_driver(driver))
368 ret = dattr->show ? dattr->show(driver, buf) : -EIO;
375 pci_driver_attr_store(struct kobject * kobj, struct attribute *attr,
376 const char *buf, size_t count)
378 struct device_driver *driver = kobj_to_pci_driver(kobj);
379 struct driver_attribute *dattr = attr_to_driver_attribute(attr);
382 if (!get_driver(driver))
385 ret = dattr->store ? dattr->store(driver, buf, count) : -EIO;
391 static struct sysfs_ops pci_driver_sysfs_ops = {
392 .show = pci_driver_attr_show,
393 .store = pci_driver_attr_store,
395 static struct kobj_type pci_driver_kobj_type = {
396 .sysfs_ops = &pci_driver_sysfs_ops,
400 * __pci_register_driver - register a new pci driver
401 * @drv: the driver structure to register
402 * @owner: owner module of drv
403 * @mod_name: module name string
405 * Adds the driver structure to the list of registered drivers.
406 * Returns a negative value on error, otherwise 0.
407 * If no error occurred, the driver remains registered even if
408 * no device was claimed during registration.
410 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
411 const char *mod_name)
415 /* initialize common driver fields */
416 drv->driver.name = drv->name;
417 drv->driver.bus = &pci_bus_type;
418 drv->driver.owner = owner;
419 drv->driver.mod_name = mod_name;
420 drv->driver.kobj.ktype = &pci_driver_kobj_type;
422 spin_lock_init(&drv->dynids.lock);
423 INIT_LIST_HEAD(&drv->dynids.list);
425 /* register with core */
426 error = driver_register(&drv->driver);
430 error = pci_create_newid_file(drv);
432 driver_unregister(&drv->driver);
438 * pci_unregister_driver - unregister a pci driver
439 * @drv: the driver structure to unregister
441 * Deletes the driver structure from the list of registered PCI drivers,
442 * gives it a chance to clean up by calling its remove() function for
443 * each device it was responsible for, and marks those devices as
448 pci_unregister_driver(struct pci_driver *drv)
450 driver_unregister(&drv->driver);
451 pci_free_dynids(drv);
454 static struct pci_driver pci_compat_driver = {
459 * pci_dev_driver - get the pci_driver of a device
460 * @dev: the device to query
462 * Returns the appropriate pci_driver structure or %NULL if there is no
463 * registered driver for the device.
466 pci_dev_driver(const struct pci_dev *dev)
472 for(i=0; i<=PCI_ROM_RESOURCE; i++)
473 if (dev->resource[i].flags & IORESOURCE_BUSY)
474 return &pci_compat_driver;
480 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
481 * @dev: the PCI device structure to match against
482 * @drv: the device driver to search for matching PCI device id structures
484 * Used by a driver to check whether a PCI device present in the
485 * system is in its list of supported devices. Returns the matching
486 * pci_device_id structure or %NULL if there is no match.
488 static int pci_bus_match(struct device *dev, struct device_driver *drv)
490 struct pci_dev *pci_dev = to_pci_dev(dev);
491 struct pci_driver *pci_drv = to_pci_driver(drv);
492 const struct pci_device_id *found_id;
494 found_id = pci_match_device(pci_drv, pci_dev);
502 * pci_dev_get - increments the reference count of the pci device structure
503 * @dev: the device being referenced
505 * Each live reference to a device should be refcounted.
507 * Drivers for PCI devices should normally record such references in
508 * their probe() methods, when they bind to a device, and release
509 * them by calling pci_dev_put(), in their disconnect() methods.
511 * A pointer to the device with the incremented reference counter is returned.
513 struct pci_dev *pci_dev_get(struct pci_dev *dev)
516 get_device(&dev->dev);
521 * pci_dev_put - release a use of the pci device structure
522 * @dev: device that's been disconnected
524 * Must be called when a user of a device is finished with it. When the last
525 * user of the device calls this function, the memory of the device is freed.
527 void pci_dev_put(struct pci_dev *dev)
530 put_device(&dev->dev);
533 #ifndef CONFIG_HOTPLUG
534 int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
540 struct bus_type pci_bus_type = {
542 .match = pci_bus_match,
543 .uevent = pci_uevent,
544 .probe = pci_device_probe,
545 .remove = pci_device_remove,
546 .suspend = pci_device_suspend,
547 .suspend_late = pci_device_suspend_late,
548 .resume_early = pci_device_resume_early,
549 .resume = pci_device_resume,
550 .shutdown = pci_device_shutdown,
551 .dev_attrs = pci_dev_attrs,
554 static int __init pci_driver_init(void)
556 return bus_register(&pci_bus_type);
559 postcore_initcall(pci_driver_init);
561 EXPORT_SYMBOL(pci_match_id);
562 EXPORT_SYMBOL(__pci_register_driver);
563 EXPORT_SYMBOL(pci_unregister_driver);
564 EXPORT_SYMBOL(pci_dev_driver);
565 EXPORT_SYMBOL(pci_bus_type);
566 EXPORT_SYMBOL(pci_dev_get);
567 EXPORT_SYMBOL(pci_dev_put);