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 * Registration of PCI drivers and handling of hot-pluggable devices.
20 /* multithreaded probe logic */
21 static int pci_multithread_probe =
22 #ifdef CONFIG_PCI_MULTITHREAD_PROBE
27 __module_param_call("", pci_multithread_probe, param_set_bool, param_get_bool, &pci_multithread_probe, 0644);
31 * Dynamic device IDs are disabled for !CONFIG_HOTPLUG
35 struct list_head node;
36 struct pci_device_id id;
42 * store_new_id - add a new PCI device ID to this driver and re-probe devices
43 * @driver: target device driver
44 * @buf: buffer for scanning device ID data
47 * Adds a new dynamic pci device ID to this driver,
48 * and causes the driver to probe for all devices again.
51 store_new_id(struct device_driver *driver, const char *buf, size_t count)
53 struct pci_dynid *dynid;
54 struct pci_driver *pdrv = to_pci_driver(driver);
55 __u32 vendor=PCI_ANY_ID, device=PCI_ANY_ID, subvendor=PCI_ANY_ID,
56 subdevice=PCI_ANY_ID, class=0, class_mask=0;
57 unsigned long driver_data=0;
61 fields = sscanf(buf, "%x %x %x %x %x %x %lux",
62 &vendor, &device, &subvendor, &subdevice,
63 &class, &class_mask, &driver_data);
67 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
71 INIT_LIST_HEAD(&dynid->node);
72 dynid->id.vendor = vendor;
73 dynid->id.device = device;
74 dynid->id.subvendor = subvendor;
75 dynid->id.subdevice = subdevice;
76 dynid->id.class = class;
77 dynid->id.class_mask = class_mask;
78 dynid->id.driver_data = pdrv->dynids.use_driver_data ?
81 spin_lock(&pdrv->dynids.lock);
82 list_add_tail(&pdrv->dynids.list, &dynid->node);
83 spin_unlock(&pdrv->dynids.lock);
85 if (get_driver(&pdrv->driver)) {
86 retval = driver_attach(&pdrv->driver);
87 put_driver(&pdrv->driver);
94 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
97 pci_free_dynids(struct pci_driver *drv)
99 struct pci_dynid *dynid, *n;
101 spin_lock(&drv->dynids.lock);
102 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
103 list_del(&dynid->node);
106 spin_unlock(&drv->dynids.lock);
110 pci_create_newid_file(struct pci_driver *drv)
113 if (drv->probe != NULL)
114 error = sysfs_create_file(&drv->driver.kobj,
115 &driver_attr_new_id.attr);
119 #else /* !CONFIG_HOTPLUG */
120 static inline void pci_free_dynids(struct pci_driver *drv) {}
121 static inline int pci_create_newid_file(struct pci_driver *drv)
128 * pci_match_id - See if a pci device matches a given pci_id table
129 * @ids: array of PCI device id structures to search in
130 * @dev: the PCI device structure to match against.
132 * Used by a driver to check whether a PCI device present in the
133 * system is in its list of supported devices. Returns the matching
134 * pci_device_id structure or %NULL if there is no match.
136 * Depreciated, don't use this as it will not catch any dynamic ids
137 * that a driver might want to check for.
139 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
143 while (ids->vendor || ids->subvendor || ids->class_mask) {
144 if (pci_match_one_device(ids, dev))
153 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
154 * @drv: the PCI driver to match against
155 * @dev: the PCI device structure to match against
157 * Used by a driver to check whether a PCI device present in the
158 * system is in its list of supported devices. Returns the matching
159 * pci_device_id structure or %NULL if there is no match.
161 const struct pci_device_id *pci_match_device(struct pci_driver *drv,
164 struct pci_dynid *dynid;
166 /* Look at the dynamic ids first, before the static ones */
167 spin_lock(&drv->dynids.lock);
168 list_for_each_entry(dynid, &drv->dynids.list, node) {
169 if (pci_match_one_device(&dynid->id, dev)) {
170 spin_unlock(&drv->dynids.lock);
174 spin_unlock(&drv->dynids.lock);
176 return pci_match_id(drv->id_table, dev);
179 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
180 const struct pci_device_id *id)
184 /* Execute driver initialization on node where the
185 device's bus is attached to. This way the driver likely
186 allocates its local memory on the right node without
187 any need to change it. */
188 struct mempolicy *oldpol;
189 cpumask_t oldmask = current->cpus_allowed;
190 int node = pcibus_to_node(dev->bus);
191 if (node >= 0 && node_online(node))
192 set_cpus_allowed(current, node_to_cpumask(node));
193 /* And set default memory allocation policy */
194 oldpol = current->mempolicy;
195 current->mempolicy = &default_policy;
196 mpol_get(current->mempolicy);
198 error = drv->probe(dev, id);
200 set_cpus_allowed(current, oldmask);
201 mpol_free(current->mempolicy);
202 current->mempolicy = oldpol;
208 * __pci_device_probe()
209 * @drv: driver to call to check if it wants the PCI device
210 * @pci_dev: PCI device being probed
212 * returns 0 on success, else error.
213 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
216 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
218 const struct pci_device_id *id;
221 if (!pci_dev->driver && drv->probe) {
224 id = pci_match_device(drv, pci_dev);
226 error = pci_call_probe(drv, pci_dev, id);
228 pci_dev->driver = drv;
235 static int pci_device_probe(struct device * dev)
238 struct pci_driver *drv;
239 struct pci_dev *pci_dev;
241 drv = to_pci_driver(dev->driver);
242 pci_dev = to_pci_dev(dev);
243 pci_dev_get(pci_dev);
244 error = __pci_device_probe(drv, pci_dev);
246 pci_dev_put(pci_dev);
251 static int pci_device_remove(struct device * dev)
253 struct pci_dev * pci_dev = to_pci_dev(dev);
254 struct pci_driver * drv = pci_dev->driver;
258 drv->remove(pci_dev);
259 pci_dev->driver = NULL;
263 * If the device is still on, set the power state as "unknown",
264 * since it might change by the next time we load the driver.
266 if (pci_dev->current_state == PCI_D0)
267 pci_dev->current_state = PCI_UNKNOWN;
270 * We would love to complain here if pci_dev->is_enabled is set, that
271 * the driver should have called pci_disable_device(), but the
272 * unfortunate fact is there are too many odd BIOS and bridge setups
273 * that don't like drivers doing that all of the time.
274 * Oh well, we can dream of sane hardware when we sleep, no matter how
275 * horrible the crap we have to deal with is when we are awake...
278 pci_dev_put(pci_dev);
282 static int pci_device_suspend(struct device * dev, pm_message_t state)
284 struct pci_dev * pci_dev = to_pci_dev(dev);
285 struct pci_driver * drv = pci_dev->driver;
288 if (drv && drv->suspend) {
289 i = drv->suspend(pci_dev, state);
290 suspend_report_result(drv->suspend, i);
292 pci_save_state(pci_dev);
294 * mark its power state as "unknown", since we don't know if
295 * e.g. the BIOS will change its device state when we suspend.
297 if (pci_dev->current_state == PCI_D0)
298 pci_dev->current_state = PCI_UNKNOWN;
303 static int pci_device_suspend_late(struct device * dev, pm_message_t state)
305 struct pci_dev * pci_dev = to_pci_dev(dev);
306 struct pci_driver * drv = pci_dev->driver;
309 if (drv && drv->suspend_late) {
310 i = drv->suspend_late(pci_dev, state);
311 suspend_report_result(drv->suspend_late, i);
317 * Default resume method for devices that have no driver provided resume,
318 * or not even a driver at all.
320 static int pci_default_resume(struct pci_dev *pci_dev)
324 /* restore the PCI config space */
325 pci_restore_state(pci_dev);
326 /* if the device was enabled before suspend, reenable */
327 retval = __pci_reenable_device(pci_dev);
328 /* if the device was busmaster before the suspend, make it busmaster again */
329 if (pci_dev->is_busmaster)
330 pci_set_master(pci_dev);
335 static int pci_device_resume(struct device * dev)
338 struct pci_dev * pci_dev = to_pci_dev(dev);
339 struct pci_driver * drv = pci_dev->driver;
341 if (drv && drv->resume)
342 error = drv->resume(pci_dev);
344 error = pci_default_resume(pci_dev);
348 static int pci_device_resume_early(struct device * dev)
351 struct pci_dev * pci_dev = to_pci_dev(dev);
352 struct pci_driver * drv = pci_dev->driver;
354 pci_fixup_device(pci_fixup_resume, pci_dev);
356 if (drv && drv->resume_early)
357 error = drv->resume_early(pci_dev);
361 static void pci_device_shutdown(struct device *dev)
363 struct pci_dev *pci_dev = to_pci_dev(dev);
364 struct pci_driver *drv = pci_dev->driver;
366 if (drv && drv->shutdown)
367 drv->shutdown(pci_dev);
370 #define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj)
371 #define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr)
374 pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
376 struct device_driver *driver = kobj_to_pci_driver(kobj);
377 struct driver_attribute *dattr = attr_to_driver_attribute(attr);
380 if (!get_driver(driver))
383 ret = dattr->show ? dattr->show(driver, buf) : -EIO;
390 pci_driver_attr_store(struct kobject * kobj, struct attribute *attr,
391 const char *buf, size_t count)
393 struct device_driver *driver = kobj_to_pci_driver(kobj);
394 struct driver_attribute *dattr = attr_to_driver_attribute(attr);
397 if (!get_driver(driver))
400 ret = dattr->store ? dattr->store(driver, buf, count) : -EIO;
406 static struct sysfs_ops pci_driver_sysfs_ops = {
407 .show = pci_driver_attr_show,
408 .store = pci_driver_attr_store,
410 static struct kobj_type pci_driver_kobj_type = {
411 .sysfs_ops = &pci_driver_sysfs_ops,
415 * __pci_register_driver - register a new pci driver
416 * @drv: the driver structure to register
417 * @owner: owner module of drv
418 * @mod_name: module name string
420 * Adds the driver structure to the list of registered drivers.
421 * Returns a negative value on error, otherwise 0.
422 * If no error occurred, the driver remains registered even if
423 * no device was claimed during registration.
425 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
426 const char *mod_name)
430 /* initialize common driver fields */
431 drv->driver.name = drv->name;
432 drv->driver.bus = &pci_bus_type;
433 drv->driver.owner = owner;
434 drv->driver.mod_name = mod_name;
435 drv->driver.kobj.ktype = &pci_driver_kobj_type;
437 spin_lock_init(&drv->dynids.lock);
438 INIT_LIST_HEAD(&drv->dynids.list);
440 /* register with core */
441 error = driver_register(&drv->driver);
445 error = pci_create_newid_file(drv);
447 driver_unregister(&drv->driver);
453 * pci_unregister_driver - unregister a pci driver
454 * @drv: the driver structure to unregister
456 * Deletes the driver structure from the list of registered PCI drivers,
457 * gives it a chance to clean up by calling its remove() function for
458 * each device it was responsible for, and marks those devices as
463 pci_unregister_driver(struct pci_driver *drv)
465 driver_unregister(&drv->driver);
466 pci_free_dynids(drv);
469 static struct pci_driver pci_compat_driver = {
474 * pci_dev_driver - get the pci_driver of a device
475 * @dev: the device to query
477 * Returns the appropriate pci_driver structure or %NULL if there is no
478 * registered driver for the device.
481 pci_dev_driver(const struct pci_dev *dev)
487 for(i=0; i<=PCI_ROM_RESOURCE; i++)
488 if (dev->resource[i].flags & IORESOURCE_BUSY)
489 return &pci_compat_driver;
495 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
496 * @dev: the PCI device structure to match against
497 * @drv: the device driver to search for matching PCI device id structures
499 * Used by a driver to check whether a PCI device present in the
500 * system is in its list of supported devices. Returns the matching
501 * pci_device_id structure or %NULL if there is no match.
503 static int pci_bus_match(struct device *dev, struct device_driver *drv)
505 struct pci_dev *pci_dev = to_pci_dev(dev);
506 struct pci_driver *pci_drv = to_pci_driver(drv);
507 const struct pci_device_id *found_id;
509 found_id = pci_match_device(pci_drv, pci_dev);
517 * pci_dev_get - increments the reference count of the pci device structure
518 * @dev: the device being referenced
520 * Each live reference to a device should be refcounted.
522 * Drivers for PCI devices should normally record such references in
523 * their probe() methods, when they bind to a device, and release
524 * them by calling pci_dev_put(), in their disconnect() methods.
526 * A pointer to the device with the incremented reference counter is returned.
528 struct pci_dev *pci_dev_get(struct pci_dev *dev)
531 get_device(&dev->dev);
536 * pci_dev_put - release a use of the pci device structure
537 * @dev: device that's been disconnected
539 * Must be called when a user of a device is finished with it. When the last
540 * user of the device calls this function, the memory of the device is freed.
542 void pci_dev_put(struct pci_dev *dev)
545 put_device(&dev->dev);
548 #ifndef CONFIG_HOTPLUG
549 int pci_uevent(struct device *dev, char **envp, int num_envp,
550 char *buffer, int buffer_size)
556 struct bus_type pci_bus_type = {
558 .match = pci_bus_match,
559 .uevent = pci_uevent,
560 .probe = pci_device_probe,
561 .remove = pci_device_remove,
562 .suspend = pci_device_suspend,
563 .suspend_late = pci_device_suspend_late,
564 .resume_early = pci_device_resume_early,
565 .resume = pci_device_resume,
566 .shutdown = pci_device_shutdown,
567 .dev_attrs = pci_dev_attrs,
570 static int __init pci_driver_init(void)
572 pci_bus_type.multithread_probe = pci_multithread_probe;
573 return bus_register(&pci_bus_type);
576 postcore_initcall(pci_driver_init);
578 EXPORT_SYMBOL(pci_match_id);
579 EXPORT_SYMBOL(pci_match_device);
580 EXPORT_SYMBOL(__pci_register_driver);
581 EXPORT_SYMBOL(pci_unregister_driver);
582 EXPORT_SYMBOL(pci_dev_driver);
583 EXPORT_SYMBOL(pci_bus_type);
584 EXPORT_SYMBOL(pci_dev_get);
585 EXPORT_SYMBOL(pci_dev_put);