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.
21 * Dynamic device IDs are disabled for !CONFIG_HOTPLUG
25 struct list_head node;
26 struct pci_device_id id;
32 * store_new_id - add a new PCI device ID to this driver and re-probe devices
33 * @driver: target device driver
34 * @buf: buffer for scanning device ID data
37 * Adds a new dynamic pci device ID to this driver,
38 * and causes the driver to probe for all devices again.
41 store_new_id(struct device_driver *driver, const char *buf, size_t count)
43 struct pci_dynid *dynid;
44 struct pci_driver *pdrv = to_pci_driver(driver);
45 __u32 vendor=PCI_ANY_ID, device=PCI_ANY_ID, subvendor=PCI_ANY_ID,
46 subdevice=PCI_ANY_ID, class=0, class_mask=0;
47 unsigned long driver_data=0;
50 fields = sscanf(buf, "%x %x %x %x %x %x %lux",
51 &vendor, &device, &subvendor, &subdevice,
52 &class, &class_mask, &driver_data);
56 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
60 INIT_LIST_HEAD(&dynid->node);
61 dynid->id.vendor = vendor;
62 dynid->id.device = device;
63 dynid->id.subvendor = subvendor;
64 dynid->id.subdevice = subdevice;
65 dynid->id.class = class;
66 dynid->id.class_mask = class_mask;
67 dynid->id.driver_data = pdrv->dynids.use_driver_data ?
70 spin_lock(&pdrv->dynids.lock);
71 list_add_tail(&pdrv->dynids.list, &dynid->node);
72 spin_unlock(&pdrv->dynids.lock);
74 if (get_driver(&pdrv->driver)) {
75 driver_attach(&pdrv->driver);
76 put_driver(&pdrv->driver);
81 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
84 pci_free_dynids(struct pci_driver *drv)
86 struct pci_dynid *dynid, *n;
88 spin_lock(&drv->dynids.lock);
89 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
90 list_del(&dynid->node);
93 spin_unlock(&drv->dynids.lock);
97 pci_create_newid_file(struct pci_driver *drv)
100 if (drv->probe != NULL)
101 error = sysfs_create_file(&drv->driver.kobj,
102 &driver_attr_new_id.attr);
106 #else /* !CONFIG_HOTPLUG */
107 static inline void pci_free_dynids(struct pci_driver *drv) {}
108 static inline int pci_create_newid_file(struct pci_driver *drv)
115 * pci_match_id - See if a pci device matches a given pci_id table
116 * @ids: array of PCI device id structures to search in
117 * @dev: the PCI device structure to match against.
119 * Used by a driver to check whether a PCI device present in the
120 * system is in its list of supported devices. Returns the matching
121 * pci_device_id structure or %NULL if there is no match.
123 * Depreciated, don't use this as it will not catch any dynamic ids
124 * that a driver might want to check for.
126 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
130 while (ids->vendor || ids->subvendor || ids->class_mask) {
131 if (pci_match_one_device(ids, dev))
140 * pci_match_device - Tell if a PCI device structure has a matching
141 * PCI device id structure
142 * @drv: the PCI driver to match against
143 * @dev: the PCI device structure to match against
145 * Used by a driver to check whether a PCI device present in the
146 * system is in its list of supported devices. Returns the matching
147 * pci_device_id structure or %NULL if there is no match.
149 const struct pci_device_id *pci_match_device(struct pci_driver *drv,
152 const struct pci_device_id *id;
153 struct pci_dynid *dynid;
155 id = pci_match_id(drv->id_table, dev);
159 /* static ids didn't match, lets look at the dynamic ones */
160 spin_lock(&drv->dynids.lock);
161 list_for_each_entry(dynid, &drv->dynids.list, node) {
162 if (pci_match_one_device(&dynid->id, dev)) {
163 spin_unlock(&drv->dynids.lock);
167 spin_unlock(&drv->dynids.lock);
171 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
172 const struct pci_device_id *id)
176 /* Execute driver initialization on node where the
177 device's bus is attached to. This way the driver likely
178 allocates its local memory on the right node without
179 any need to change it. */
180 struct mempolicy *oldpol;
181 cpumask_t oldmask = current->cpus_allowed;
182 int node = pcibus_to_node(dev->bus);
183 if (node >= 0 && node_online(node))
184 set_cpus_allowed(current, node_to_cpumask(node));
185 /* And set default memory allocation policy */
186 oldpol = current->mempolicy;
187 current->mempolicy = &default_policy;
188 mpol_get(current->mempolicy);
190 error = drv->probe(dev, id);
192 set_cpus_allowed(current, oldmask);
193 mpol_free(current->mempolicy);
194 current->mempolicy = oldpol;
200 * __pci_device_probe()
201 * @drv: driver to call to check if it wants the PCI device
202 * @pci_dev: PCI device being probed
204 * returns 0 on success, else error.
205 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
208 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
210 const struct pci_device_id *id;
213 if (!pci_dev->driver && drv->probe) {
216 id = pci_match_device(drv, pci_dev);
218 error = pci_call_probe(drv, pci_dev, id);
220 pci_dev->driver = drv;
227 static int pci_device_probe(struct device * dev)
230 struct pci_driver *drv;
231 struct pci_dev *pci_dev;
233 drv = to_pci_driver(dev->driver);
234 pci_dev = to_pci_dev(dev);
235 pci_dev_get(pci_dev);
236 error = __pci_device_probe(drv, pci_dev);
238 pci_dev_put(pci_dev);
243 static int pci_device_remove(struct device * dev)
245 struct pci_dev * pci_dev = to_pci_dev(dev);
246 struct pci_driver * drv = pci_dev->driver;
250 drv->remove(pci_dev);
251 pci_dev->driver = NULL;
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);
284 * Default resume method for devices that have no driver provided resume,
285 * or not even a driver at all.
287 static int pci_default_resume(struct pci_dev *pci_dev)
291 /* restore the PCI config space */
292 pci_restore_state(pci_dev);
293 /* if the device was enabled before suspend, reenable */
294 if (pci_dev->is_enabled)
295 retval = pci_enable_device(pci_dev);
296 /* if the device was busmaster before the suspend, make it busmaster again */
297 if (pci_dev->is_busmaster)
298 pci_set_master(pci_dev);
303 static int pci_device_resume(struct device * dev)
306 struct pci_dev * pci_dev = to_pci_dev(dev);
307 struct pci_driver * drv = pci_dev->driver;
309 if (drv && drv->resume)
310 error = drv->resume(pci_dev);
312 error = pci_default_resume(pci_dev);
316 static void pci_device_shutdown(struct device *dev)
318 struct pci_dev *pci_dev = to_pci_dev(dev);
319 struct pci_driver *drv = pci_dev->driver;
321 if (drv && drv->shutdown)
322 drv->shutdown(pci_dev);
325 #define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj)
326 #define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr)
329 pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
331 struct device_driver *driver = kobj_to_pci_driver(kobj);
332 struct driver_attribute *dattr = attr_to_driver_attribute(attr);
335 if (!get_driver(driver))
338 ret = dattr->show ? dattr->show(driver, buf) : -EIO;
345 pci_driver_attr_store(struct kobject * kobj, struct attribute *attr,
346 const char *buf, size_t count)
348 struct device_driver *driver = kobj_to_pci_driver(kobj);
349 struct driver_attribute *dattr = attr_to_driver_attribute(attr);
352 if (!get_driver(driver))
355 ret = dattr->store ? dattr->store(driver, buf, count) : -EIO;
361 static struct sysfs_ops pci_driver_sysfs_ops = {
362 .show = pci_driver_attr_show,
363 .store = pci_driver_attr_store,
365 static struct kobj_type pci_driver_kobj_type = {
366 .sysfs_ops = &pci_driver_sysfs_ops,
370 * __pci_register_driver - register a new pci driver
371 * @drv: the driver structure to register
372 * @owner: owner module of drv
374 * Adds the driver structure to the list of registered drivers.
375 * Returns a negative value on error, otherwise 0.
376 * If no error occurred, the driver remains registered even if
377 * no device was claimed during registration.
379 int __pci_register_driver(struct pci_driver *drv, struct module *owner)
383 /* initialize common driver fields */
384 drv->driver.name = drv->name;
385 drv->driver.bus = &pci_bus_type;
386 drv->driver.owner = owner;
387 drv->driver.kobj.ktype = &pci_driver_kobj_type;
389 spin_lock_init(&drv->dynids.lock);
390 INIT_LIST_HEAD(&drv->dynids.list);
392 /* register with core */
393 error = driver_register(&drv->driver);
396 error = pci_create_newid_file(drv);
402 * pci_unregister_driver - unregister a pci driver
403 * @drv: the driver structure to unregister
405 * Deletes the driver structure from the list of registered PCI drivers,
406 * gives it a chance to clean up by calling its remove() function for
407 * each device it was responsible for, and marks those devices as
412 pci_unregister_driver(struct pci_driver *drv)
414 driver_unregister(&drv->driver);
415 pci_free_dynids(drv);
418 static struct pci_driver pci_compat_driver = {
423 * pci_dev_driver - get the pci_driver of a device
424 * @dev: the device to query
426 * Returns the appropriate pci_driver structure or %NULL if there is no
427 * registered driver for the device.
430 pci_dev_driver(const struct pci_dev *dev)
436 for(i=0; i<=PCI_ROM_RESOURCE; i++)
437 if (dev->resource[i].flags & IORESOURCE_BUSY)
438 return &pci_compat_driver;
444 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
445 * @dev: the PCI device structure to match against
446 * @drv: the device driver to search for matching PCI device id structures
448 * Used by a driver to check whether a PCI device present in the
449 * system is in its list of supported devices. Returns the matching
450 * pci_device_id structure or %NULL if there is no match.
452 static int pci_bus_match(struct device *dev, struct device_driver *drv)
454 struct pci_dev *pci_dev = to_pci_dev(dev);
455 struct pci_driver *pci_drv = to_pci_driver(drv);
456 const struct pci_device_id *found_id;
458 found_id = pci_match_device(pci_drv, pci_dev);
466 * pci_dev_get - increments the reference count of the pci device structure
467 * @dev: the device being referenced
469 * Each live reference to a device should be refcounted.
471 * Drivers for PCI devices should normally record such references in
472 * their probe() methods, when they bind to a device, and release
473 * them by calling pci_dev_put(), in their disconnect() methods.
475 * A pointer to the device with the incremented reference counter is returned.
477 struct pci_dev *pci_dev_get(struct pci_dev *dev)
480 get_device(&dev->dev);
485 * pci_dev_put - release a use of the pci device structure
486 * @dev: device that's been disconnected
488 * Must be called when a user of a device is finished with it. When the last
489 * user of the device calls this function, the memory of the device is freed.
491 void pci_dev_put(struct pci_dev *dev)
494 put_device(&dev->dev);
497 #ifndef CONFIG_HOTPLUG
498 int pci_uevent(struct device *dev, char **envp, int num_envp,
499 char *buffer, int buffer_size)
505 struct bus_type pci_bus_type = {
507 .match = pci_bus_match,
508 .uevent = pci_uevent,
509 .probe = pci_device_probe,
510 .remove = pci_device_remove,
511 .suspend = pci_device_suspend,
512 .shutdown = pci_device_shutdown,
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);