Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
d42c6997 | 10 | #include <linux/mempolicy.h> |
4e57b681 TS |
11 | #include <linux/string.h> |
12 | #include <linux/slab.h> | |
8c65b4a6 | 13 | #include <linux/sched.h> |
1da177e4 LT |
14 | #include "pci.h" |
15 | ||
16 | /* | |
17 | * Registration of PCI drivers and handling of hot-pluggable devices. | |
18 | */ | |
19 | ||
20 | /* | |
21 | * Dynamic device IDs are disabled for !CONFIG_HOTPLUG | |
22 | */ | |
23 | ||
75865858 GKH |
24 | struct pci_dynid { |
25 | struct list_head node; | |
26 | struct pci_device_id id; | |
27 | }; | |
1da177e4 | 28 | |
3d3c2ae1 GKH |
29 | #ifdef CONFIG_HOTPLUG |
30 | ||
1da177e4 | 31 | /** |
8f7020d3 RD |
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 | |
35 | * @count: input size | |
1da177e4 LT |
36 | * |
37 | * Adds a new dynamic pci device ID to this driver, | |
38 | * and causes the driver to probe for all devices again. | |
39 | */ | |
f8eb1005 | 40 | static ssize_t |
1da177e4 LT |
41 | store_new_id(struct device_driver *driver, const char *buf, size_t count) |
42 | { | |
75865858 | 43 | struct pci_dynid *dynid; |
1da177e4 LT |
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; | |
48 | int fields=0; | |
49 | ||
50 | fields = sscanf(buf, "%x %x %x %x %x %x %lux", | |
51 | &vendor, &device, &subvendor, &subdevice, | |
52 | &class, &class_mask, &driver_data); | |
53 | if (fields < 0) | |
54 | return -EINVAL; | |
55 | ||
56 | dynid = kmalloc(sizeof(*dynid), GFP_KERNEL); | |
57 | if (!dynid) | |
58 | return -ENOMEM; | |
59 | ||
60 | memset(dynid, 0, sizeof(*dynid)); | |
61 | INIT_LIST_HEAD(&dynid->node); | |
62 | dynid->id.vendor = vendor; | |
63 | dynid->id.device = device; | |
64 | dynid->id.subvendor = subvendor; | |
65 | dynid->id.subdevice = subdevice; | |
66 | dynid->id.class = class; | |
67 | dynid->id.class_mask = class_mask; | |
68 | dynid->id.driver_data = pdrv->dynids.use_driver_data ? | |
69 | driver_data : 0UL; | |
70 | ||
71 | spin_lock(&pdrv->dynids.lock); | |
72 | list_add_tail(&pdrv->dynids.list, &dynid->node); | |
73 | spin_unlock(&pdrv->dynids.lock); | |
74 | ||
75865858 GKH |
75 | if (get_driver(&pdrv->driver)) { |
76 | driver_attach(&pdrv->driver); | |
77 | put_driver(&pdrv->driver); | |
1da177e4 LT |
78 | } |
79 | ||
80 | return count; | |
81 | } | |
1da177e4 | 82 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
1da177e4 LT |
83 | |
84 | static void | |
85 | pci_free_dynids(struct pci_driver *drv) | |
86 | { | |
75865858 | 87 | struct pci_dynid *dynid, *n; |
1da177e4 LT |
88 | |
89 | spin_lock(&drv->dynids.lock); | |
75865858 | 90 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { |
1da177e4 LT |
91 | list_del(&dynid->node); |
92 | kfree(dynid); | |
93 | } | |
94 | spin_unlock(&drv->dynids.lock); | |
95 | } | |
96 | ||
97 | static int | |
98 | pci_create_newid_file(struct pci_driver *drv) | |
99 | { | |
100 | int error = 0; | |
101 | if (drv->probe != NULL) | |
102 | error = sysfs_create_file(&drv->driver.kobj, | |
103 | &driver_attr_new_id.attr); | |
104 | return error; | |
105 | } | |
106 | ||
1da177e4 | 107 | #else /* !CONFIG_HOTPLUG */ |
1da177e4 LT |
108 | static inline void pci_free_dynids(struct pci_driver *drv) {} |
109 | static inline int pci_create_newid_file(struct pci_driver *drv) | |
110 | { | |
111 | return 0; | |
112 | } | |
1da177e4 LT |
113 | #endif |
114 | ||
115 | /** | |
75865858 | 116 | * pci_match_id - See if a pci device matches a given pci_id table |
1da177e4 | 117 | * @ids: array of PCI device id structures to search in |
75865858 GKH |
118 | * @dev: the PCI device structure to match against. |
119 | * | |
1da177e4 | 120 | * Used by a driver to check whether a PCI device present in the |
75865858 | 121 | * system is in its list of supported devices. Returns the matching |
1da177e4 | 122 | * pci_device_id structure or %NULL if there is no match. |
75865858 GKH |
123 | * |
124 | * Depreciated, don't use this as it will not catch any dynamic ids | |
125 | * that a driver might want to check for. | |
1da177e4 | 126 | */ |
75865858 GKH |
127 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
128 | struct pci_dev *dev) | |
1da177e4 | 129 | { |
75865858 GKH |
130 | if (ids) { |
131 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
132 | if (pci_match_one_device(ids, dev)) | |
133 | return ids; | |
134 | ids++; | |
135 | } | |
1da177e4 LT |
136 | } |
137 | return NULL; | |
138 | } | |
139 | ||
140 | /** | |
75865858 GKH |
141 | * pci_match_device - Tell if a PCI device structure has a matching |
142 | * PCI device id structure | |
143 | * @ids: array of PCI device id structures to search in | |
144 | * @dev: the PCI device structure to match against | |
145 | * @drv: the PCI driver to match against | |
146 | * | |
147 | * Used by a driver to check whether a PCI device present in the | |
148 | * system is in its list of supported devices. Returns the matching | |
149 | * pci_device_id structure or %NULL if there is no match. | |
1da177e4 | 150 | */ |
75865858 GKH |
151 | const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
152 | struct pci_dev *dev) | |
153 | { | |
1da177e4 | 154 | const struct pci_device_id *id; |
75865858 | 155 | struct pci_dynid *dynid; |
1da177e4 | 156 | |
75865858 | 157 | id = pci_match_id(drv->id_table, dev); |
1da177e4 | 158 | if (id) |
75865858 GKH |
159 | return id; |
160 | ||
161 | /* static ids didn't match, lets look at the dynamic ones */ | |
162 | spin_lock(&drv->dynids.lock); | |
163 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
164 | if (pci_match_one_device(&dynid->id, dev)) { | |
165 | spin_unlock(&drv->dynids.lock); | |
166 | return &dynid->id; | |
167 | } | |
1da177e4 | 168 | } |
75865858 GKH |
169 | spin_unlock(&drv->dynids.lock); |
170 | return NULL; | |
1da177e4 LT |
171 | } |
172 | ||
d42c6997 AK |
173 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
174 | const struct pci_device_id *id) | |
175 | { | |
176 | int error; | |
177 | #ifdef CONFIG_NUMA | |
178 | /* Execute driver initialization on node where the | |
179 | device's bus is attached to. This way the driver likely | |
180 | allocates its local memory on the right node without | |
181 | any need to change it. */ | |
182 | struct mempolicy *oldpol; | |
183 | cpumask_t oldmask = current->cpus_allowed; | |
184 | int node = pcibus_to_node(dev->bus); | |
185 | if (node >= 0 && node_online(node)) | |
186 | set_cpus_allowed(current, node_to_cpumask(node)); | |
187 | /* And set default memory allocation policy */ | |
188 | oldpol = current->mempolicy; | |
189 | current->mempolicy = &default_policy; | |
190 | mpol_get(current->mempolicy); | |
191 | #endif | |
192 | error = drv->probe(dev, id); | |
193 | #ifdef CONFIG_NUMA | |
194 | set_cpus_allowed(current, oldmask); | |
195 | mpol_free(current->mempolicy); | |
196 | current->mempolicy = oldpol; | |
197 | #endif | |
198 | return error; | |
199 | } | |
200 | ||
1da177e4 LT |
201 | /** |
202 | * __pci_device_probe() | |
8f7020d3 RD |
203 | * @drv: driver to call to check if it wants the PCI device |
204 | * @pci_dev: PCI device being probed | |
1da177e4 | 205 | * |
8f7020d3 | 206 | * returns 0 on success, else error. |
1da177e4 LT |
207 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
208 | */ | |
209 | static int | |
210 | __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) | |
75865858 GKH |
211 | { |
212 | const struct pci_device_id *id; | |
1da177e4 LT |
213 | int error = 0; |
214 | ||
215 | if (!pci_dev->driver && drv->probe) { | |
75865858 GKH |
216 | error = -ENODEV; |
217 | ||
218 | id = pci_match_device(drv, pci_dev); | |
219 | if (id) | |
d42c6997 | 220 | error = pci_call_probe(drv, pci_dev, id); |
75865858 GKH |
221 | if (error >= 0) { |
222 | pci_dev->driver = drv; | |
223 | error = 0; | |
224 | } | |
1da177e4 LT |
225 | } |
226 | return error; | |
227 | } | |
228 | ||
229 | static int pci_device_probe(struct device * dev) | |
230 | { | |
231 | int error = 0; | |
232 | struct pci_driver *drv; | |
233 | struct pci_dev *pci_dev; | |
234 | ||
235 | drv = to_pci_driver(dev->driver); | |
236 | pci_dev = to_pci_dev(dev); | |
237 | pci_dev_get(pci_dev); | |
238 | error = __pci_device_probe(drv, pci_dev); | |
239 | if (error) | |
240 | pci_dev_put(pci_dev); | |
241 | ||
242 | return error; | |
243 | } | |
244 | ||
245 | static int pci_device_remove(struct device * dev) | |
246 | { | |
247 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
248 | struct pci_driver * drv = pci_dev->driver; | |
249 | ||
250 | if (drv) { | |
251 | if (drv->remove) | |
252 | drv->remove(pci_dev); | |
253 | pci_dev->driver = NULL; | |
254 | } | |
255 | ||
256 | /* | |
257 | * We would love to complain here if pci_dev->is_enabled is set, that | |
258 | * the driver should have called pci_disable_device(), but the | |
259 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
260 | * that don't like drivers doing that all of the time. | |
261 | * Oh well, we can dream of sane hardware when we sleep, no matter how | |
262 | * horrible the crap we have to deal with is when we are awake... | |
263 | */ | |
264 | ||
265 | pci_dev_put(pci_dev); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | static int pci_device_suspend(struct device * dev, pm_message_t state) | |
270 | { | |
271 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
272 | struct pci_driver * drv = pci_dev->driver; | |
273 | int i = 0; | |
274 | ||
275 | if (drv && drv->suspend) | |
276 | i = drv->suspend(pci_dev, state); | |
277 | else | |
278 | pci_save_state(pci_dev); | |
279 | return i; | |
280 | } | |
281 | ||
282 | ||
95a62965 | 283 | /* |
1da177e4 LT |
284 | * Default resume method for devices that have no driver provided resume, |
285 | * or not even a driver at all. | |
286 | */ | |
287 | static void pci_default_resume(struct pci_dev *pci_dev) | |
288 | { | |
95a62965 GKH |
289 | int retval; |
290 | ||
1da177e4 LT |
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) | |
95a62965 | 295 | retval = pci_enable_device(pci_dev); |
1da177e4 LT |
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); | |
299 | } | |
300 | ||
301 | static int pci_device_resume(struct device * dev) | |
302 | { | |
303 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
304 | struct pci_driver * drv = pci_dev->driver; | |
305 | ||
306 | if (drv && drv->resume) | |
307 | drv->resume(pci_dev); | |
308 | else | |
309 | pci_default_resume(pci_dev); | |
310 | return 0; | |
311 | } | |
312 | ||
c8958177 GKH |
313 | static void pci_device_shutdown(struct device *dev) |
314 | { | |
315 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
316 | struct pci_driver *drv = pci_dev->driver; | |
317 | ||
318 | if (drv && drv->shutdown) | |
319 | drv->shutdown(pci_dev); | |
320 | } | |
1da177e4 LT |
321 | |
322 | #define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj) | |
323 | #define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr) | |
324 | ||
325 | static ssize_t | |
326 | pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf) | |
327 | { | |
328 | struct device_driver *driver = kobj_to_pci_driver(kobj); | |
329 | struct driver_attribute *dattr = attr_to_driver_attribute(attr); | |
fc7e4828 | 330 | ssize_t ret; |
1da177e4 | 331 | |
fc7e4828 DT |
332 | if (!get_driver(driver)) |
333 | return -ENODEV; | |
334 | ||
335 | ret = dattr->show ? dattr->show(driver, buf) : -EIO; | |
336 | ||
337 | put_driver(driver); | |
1da177e4 LT |
338 | return ret; |
339 | } | |
340 | ||
341 | static ssize_t | |
342 | pci_driver_attr_store(struct kobject * kobj, struct attribute *attr, | |
343 | const char *buf, size_t count) | |
344 | { | |
345 | struct device_driver *driver = kobj_to_pci_driver(kobj); | |
346 | struct driver_attribute *dattr = attr_to_driver_attribute(attr); | |
fc7e4828 | 347 | ssize_t ret; |
1da177e4 | 348 | |
fc7e4828 DT |
349 | if (!get_driver(driver)) |
350 | return -ENODEV; | |
351 | ||
352 | ret = dattr->store ? dattr->store(driver, buf, count) : -EIO; | |
353 | ||
354 | put_driver(driver); | |
1da177e4 LT |
355 | return ret; |
356 | } | |
357 | ||
358 | static struct sysfs_ops pci_driver_sysfs_ops = { | |
359 | .show = pci_driver_attr_show, | |
360 | .store = pci_driver_attr_store, | |
361 | }; | |
362 | static struct kobj_type pci_driver_kobj_type = { | |
363 | .sysfs_ops = &pci_driver_sysfs_ops, | |
364 | }; | |
365 | ||
1da177e4 LT |
366 | /** |
367 | * pci_register_driver - register a new pci driver | |
368 | * @drv: the driver structure to register | |
369 | * | |
370 | * Adds the driver structure to the list of registered drivers. | |
371 | * Returns a negative value on error, otherwise 0. | |
eaae4b3a | 372 | * If no error occurred, the driver remains registered even if |
1da177e4 LT |
373 | * no device was claimed during registration. |
374 | */ | |
375 | int pci_register_driver(struct pci_driver *drv) | |
376 | { | |
377 | int error; | |
378 | ||
379 | /* initialize common driver fields */ | |
380 | drv->driver.name = drv->name; | |
381 | drv->driver.bus = &pci_bus_type; | |
382 | drv->driver.probe = pci_device_probe; | |
383 | drv->driver.remove = pci_device_remove; | |
794f5bfa CH |
384 | /* FIXME, once all of the existing PCI drivers have been fixed to set |
385 | * the pci shutdown function, this test can go away. */ | |
386 | if (!drv->driver.shutdown) | |
c83d9945 | 387 | drv->driver.shutdown = pci_device_shutdown; |
a1720fdb RK |
388 | else |
389 | printk(KERN_WARNING "Warning: PCI driver %s has a struct " | |
390 | "device_driver shutdown method, please update!\n", | |
391 | drv->name); | |
1da177e4 LT |
392 | drv->driver.owner = drv->owner; |
393 | drv->driver.kobj.ktype = &pci_driver_kobj_type; | |
75865858 GKH |
394 | |
395 | spin_lock_init(&drv->dynids.lock); | |
396 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
397 | |
398 | /* register with core */ | |
399 | error = driver_register(&drv->driver); | |
400 | ||
401 | if (!error) | |
75865858 | 402 | error = pci_create_newid_file(drv); |
1da177e4 LT |
403 | |
404 | return error; | |
405 | } | |
406 | ||
407 | /** | |
408 | * pci_unregister_driver - unregister a pci driver | |
409 | * @drv: the driver structure to unregister | |
410 | * | |
411 | * Deletes the driver structure from the list of registered PCI drivers, | |
412 | * gives it a chance to clean up by calling its remove() function for | |
413 | * each device it was responsible for, and marks those devices as | |
414 | * driverless. | |
415 | */ | |
416 | ||
417 | void | |
418 | pci_unregister_driver(struct pci_driver *drv) | |
419 | { | |
420 | driver_unregister(&drv->driver); | |
421 | pci_free_dynids(drv); | |
422 | } | |
423 | ||
424 | static struct pci_driver pci_compat_driver = { | |
425 | .name = "compat" | |
426 | }; | |
427 | ||
428 | /** | |
429 | * pci_dev_driver - get the pci_driver of a device | |
430 | * @dev: the device to query | |
431 | * | |
432 | * Returns the appropriate pci_driver structure or %NULL if there is no | |
433 | * registered driver for the device. | |
434 | */ | |
435 | struct pci_driver * | |
436 | pci_dev_driver(const struct pci_dev *dev) | |
437 | { | |
438 | if (dev->driver) | |
439 | return dev->driver; | |
440 | else { | |
441 | int i; | |
442 | for(i=0; i<=PCI_ROM_RESOURCE; i++) | |
443 | if (dev->resource[i].flags & IORESOURCE_BUSY) | |
444 | return &pci_compat_driver; | |
445 | } | |
446 | return NULL; | |
447 | } | |
448 | ||
449 | /** | |
450 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 451 | * @dev: the PCI device structure to match against |
8f7020d3 | 452 | * @drv: the device driver to search for matching PCI device id structures |
1da177e4 LT |
453 | * |
454 | * Used by a driver to check whether a PCI device present in the | |
8f7020d3 | 455 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
456 | * pci_device_id structure or %NULL if there is no match. |
457 | */ | |
75865858 | 458 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 459 | { |
75865858 GKH |
460 | struct pci_dev *pci_dev = to_pci_dev(dev); |
461 | struct pci_driver *pci_drv = to_pci_driver(drv); | |
1da177e4 LT |
462 | const struct pci_device_id *found_id; |
463 | ||
75865858 | 464 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
465 | if (found_id) |
466 | return 1; | |
467 | ||
75865858 | 468 | return 0; |
1da177e4 LT |
469 | } |
470 | ||
471 | /** | |
472 | * pci_dev_get - increments the reference count of the pci device structure | |
473 | * @dev: the device being referenced | |
474 | * | |
475 | * Each live reference to a device should be refcounted. | |
476 | * | |
477 | * Drivers for PCI devices should normally record such references in | |
478 | * their probe() methods, when they bind to a device, and release | |
479 | * them by calling pci_dev_put(), in their disconnect() methods. | |
480 | * | |
481 | * A pointer to the device with the incremented reference counter is returned. | |
482 | */ | |
483 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
484 | { | |
485 | if (dev) | |
486 | get_device(&dev->dev); | |
487 | return dev; | |
488 | } | |
489 | ||
490 | /** | |
491 | * pci_dev_put - release a use of the pci device structure | |
492 | * @dev: device that's been disconnected | |
493 | * | |
494 | * Must be called when a user of a device is finished with it. When the last | |
495 | * user of the device calls this function, the memory of the device is freed. | |
496 | */ | |
497 | void pci_dev_put(struct pci_dev *dev) | |
498 | { | |
499 | if (dev) | |
500 | put_device(&dev->dev); | |
501 | } | |
502 | ||
503 | #ifndef CONFIG_HOTPLUG | |
504 | int pci_hotplug (struct device *dev, char **envp, int num_envp, | |
505 | char *buffer, int buffer_size) | |
506 | { | |
507 | return -ENODEV; | |
508 | } | |
509 | #endif | |
510 | ||
511 | struct bus_type pci_bus_type = { | |
512 | .name = "pci", | |
513 | .match = pci_bus_match, | |
514 | .hotplug = pci_hotplug, | |
515 | .suspend = pci_device_suspend, | |
516 | .resume = pci_device_resume, | |
517 | .dev_attrs = pci_dev_attrs, | |
518 | }; | |
519 | ||
520 | static int __init pci_driver_init(void) | |
521 | { | |
522 | return bus_register(&pci_bus_type); | |
523 | } | |
524 | ||
525 | postcore_initcall(pci_driver_init); | |
526 | ||
75865858 | 527 | EXPORT_SYMBOL(pci_match_id); |
1da177e4 LT |
528 | EXPORT_SYMBOL(pci_match_device); |
529 | EXPORT_SYMBOL(pci_register_driver); | |
530 | EXPORT_SYMBOL(pci_unregister_driver); | |
531 | EXPORT_SYMBOL(pci_dev_driver); | |
532 | EXPORT_SYMBOL(pci_bus_type); | |
533 | EXPORT_SYMBOL(pci_dev_get); | |
534 | EXPORT_SYMBOL(pci_dev_put); |