Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * PCI searching functions. | |
3 | * | |
4 | * Copyright (C) 1993 -- 1997 Drew Eckhardt, Frederic Potter, | |
5 | * David Mosberger-Tang | |
6 | * Copyright (C) 1997 -- 2000 Martin Mares <mj@ucw.cz> | |
7 | * Copyright (C) 2003 -- 2004 Greg Kroah-Hartman <greg@kroah.com> | |
8 | */ | |
9 | ||
10 | #include <linux/init.h> | |
11 | #include <linux/pci.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include "pci.h" | |
15 | ||
d71374da | 16 | DECLARE_RWSEM(pci_bus_sem); |
1da177e4 LT |
17 | |
18 | static struct pci_bus * __devinit | |
19 | pci_do_find_bus(struct pci_bus* bus, unsigned char busnr) | |
20 | { | |
21 | struct pci_bus* child; | |
22 | struct list_head *tmp; | |
23 | ||
24 | if(bus->number == busnr) | |
25 | return bus; | |
26 | ||
27 | list_for_each(tmp, &bus->children) { | |
28 | child = pci_do_find_bus(pci_bus_b(tmp), busnr); | |
29 | if(child) | |
30 | return child; | |
31 | } | |
32 | return NULL; | |
33 | } | |
34 | ||
35 | /** | |
36 | * pci_find_bus - locate PCI bus from a given domain and bus number | |
37 | * @domain: number of PCI domain to search | |
38 | * @busnr: number of desired PCI bus | |
39 | * | |
40 | * Given a PCI bus number and domain number, the desired PCI bus is located | |
41 | * in the global list of PCI buses. If the bus is found, a pointer to its | |
42 | * data structure is returned. If no bus is found, %NULL is returned. | |
43 | */ | |
c8439cfc | 44 | struct pci_bus * pci_find_bus(int domain, int busnr) |
1da177e4 LT |
45 | { |
46 | struct pci_bus *bus = NULL; | |
47 | struct pci_bus *tmp_bus; | |
48 | ||
49 | while ((bus = pci_find_next_bus(bus)) != NULL) { | |
50 | if (pci_domain_nr(bus) != domain) | |
51 | continue; | |
52 | tmp_bus = pci_do_find_bus(bus, busnr); | |
53 | if (tmp_bus) | |
54 | return tmp_bus; | |
55 | } | |
56 | return NULL; | |
57 | } | |
58 | ||
59 | /** | |
60 | * pci_find_next_bus - begin or continue searching for a PCI bus | |
61 | * @from: Previous PCI bus found, or %NULL for new search. | |
62 | * | |
63 | * Iterates through the list of known PCI busses. A new search is | |
d75763d2 | 64 | * initiated by passing %NULL as the @from argument. Otherwise if |
1da177e4 LT |
65 | * @from is not %NULL, searches continue from next device on the |
66 | * global list. | |
67 | */ | |
68 | struct pci_bus * | |
69 | pci_find_next_bus(const struct pci_bus *from) | |
70 | { | |
71 | struct list_head *n; | |
72 | struct pci_bus *b = NULL; | |
73 | ||
74 | WARN_ON(in_interrupt()); | |
d71374da | 75 | down_read(&pci_bus_sem); |
1da177e4 LT |
76 | n = from ? from->node.next : pci_root_buses.next; |
77 | if (n != &pci_root_buses) | |
78 | b = pci_bus_b(n); | |
d71374da | 79 | up_read(&pci_bus_sem); |
1da177e4 LT |
80 | return b; |
81 | } | |
82 | ||
83 | /** | |
84 | * pci_find_slot - locate PCI device from a given PCI slot | |
85 | * @bus: number of PCI bus on which desired PCI device resides | |
86 | * @devfn: encodes number of PCI slot in which the desired PCI | |
87 | * device resides and the logical device number within that slot | |
88 | * in case of multi-function devices. | |
89 | * | |
90 | * Given a PCI bus and slot/function number, the desired PCI device | |
91 | * is located in system global list of PCI devices. If the device | |
92 | * is found, a pointer to its data structure is returned. If no | |
93 | * device is found, %NULL is returned. | |
94 | */ | |
95 | struct pci_dev * | |
96 | pci_find_slot(unsigned int bus, unsigned int devfn) | |
97 | { | |
98 | struct pci_dev *dev = NULL; | |
99 | ||
100 | while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { | |
101 | if (dev->bus->number == bus && dev->devfn == devfn) | |
102 | return dev; | |
103 | } | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | /** | |
108 | * pci_get_slot - locate PCI device for a given PCI slot | |
109 | * @bus: PCI bus on which desired PCI device resides | |
110 | * @devfn: encodes number of PCI slot in which the desired PCI | |
111 | * device resides and the logical device number within that slot | |
112 | * in case of multi-function devices. | |
113 | * | |
114 | * Given a PCI bus and slot/function number, the desired PCI device | |
115 | * is located in the list of PCI devices. | |
116 | * If the device is found, its reference count is increased and this | |
117 | * function returns a pointer to its data structure. The caller must | |
118 | * decrement the reference count by calling pci_dev_put(). | |
119 | * If no device is found, %NULL is returned. | |
120 | */ | |
121 | struct pci_dev * pci_get_slot(struct pci_bus *bus, unsigned int devfn) | |
122 | { | |
123 | struct list_head *tmp; | |
124 | struct pci_dev *dev; | |
125 | ||
126 | WARN_ON(in_interrupt()); | |
d71374da | 127 | down_read(&pci_bus_sem); |
1da177e4 LT |
128 | |
129 | list_for_each(tmp, &bus->devices) { | |
130 | dev = pci_dev_b(tmp); | |
131 | if (dev->devfn == devfn) | |
132 | goto out; | |
133 | } | |
134 | ||
135 | dev = NULL; | |
136 | out: | |
137 | pci_dev_get(dev); | |
d71374da | 138 | up_read(&pci_bus_sem); |
1da177e4 LT |
139 | return dev; |
140 | } | |
141 | ||
29f3eb64 AC |
142 | /** |
143 | * pci_get_bus_and_slot - locate PCI device from a given PCI slot | |
144 | * @bus: number of PCI bus on which desired PCI device resides | |
145 | * @devfn: encodes number of PCI slot in which the desired PCI | |
146 | * device resides and the logical device number within that slot | |
147 | * in case of multi-function devices. | |
148 | * | |
149 | * Given a PCI bus and slot/function number, the desired PCI device | |
150 | * is located in system global list of PCI devices. If the device | |
151 | * is found, a pointer to its data structure is returned. If no | |
152 | * device is found, %NULL is returned. The returned device has its | |
153 | * reference count bumped by one. | |
154 | */ | |
155 | ||
156 | struct pci_dev * pci_get_bus_and_slot(unsigned int bus, unsigned int devfn) | |
157 | { | |
158 | struct pci_dev *dev = NULL; | |
159 | ||
160 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { | |
161 | if (dev->bus->number == bus && dev->devfn == devfn) | |
162 | return dev; | |
163 | } | |
164 | return NULL; | |
165 | } | |
166 | ||
1da177e4 LT |
167 | /** |
168 | * pci_find_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id | |
169 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
170 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
171 | * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
172 | * @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids | |
173 | * @from: Previous PCI device found in search, or %NULL for new search. | |
174 | * | |
175 | * Iterates through the list of known PCI devices. If a PCI device is | |
d75763d2 RD |
176 | * found with a matching @vendor, @device, @ss_vendor and @ss_device, a |
177 | * pointer to its device structure is returned. Otherwise, %NULL is returned. | |
178 | * A new search is initiated by passing %NULL as the @from argument. | |
179 | * Otherwise if @from is not %NULL, searches continue from next device | |
180 | * on the global list. | |
1da177e4 | 181 | * |
d75763d2 RD |
182 | * NOTE: Do not use this function any more; use pci_get_subsys() instead, as |
183 | * the PCI device returned by this function can disappear at any moment in | |
1da177e4 LT |
184 | * time. |
185 | */ | |
186 | static struct pci_dev * pci_find_subsys(unsigned int vendor, | |
187 | unsigned int device, | |
188 | unsigned int ss_vendor, | |
189 | unsigned int ss_device, | |
190 | const struct pci_dev *from) | |
191 | { | |
192 | struct list_head *n; | |
193 | struct pci_dev *dev; | |
194 | ||
195 | WARN_ON(in_interrupt()); | |
6ae4adf5 AB |
196 | |
197 | /* | |
198 | * pci_find_subsys() can be called on the ide_setup() path, super-early | |
199 | * in boot. But the down_read() will enable local interrupts, which | |
200 | * can cause some machines to crash. So here we detect and flag that | |
201 | * situation and bail out early. | |
202 | */ | |
203 | if (unlikely(list_empty(&pci_devices))) { | |
204 | printk(KERN_INFO "pci_find_subsys() called while pci_devices " | |
205 | "is still empty\n"); | |
206 | return NULL; | |
207 | } | |
d71374da | 208 | down_read(&pci_bus_sem); |
1da177e4 LT |
209 | n = from ? from->global_list.next : pci_devices.next; |
210 | ||
211 | while (n && (n != &pci_devices)) { | |
212 | dev = pci_dev_g(n); | |
213 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
214 | (device == PCI_ANY_ID || dev->device == device) && | |
215 | (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) && | |
216 | (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device)) | |
217 | goto exit; | |
218 | n = n->next; | |
219 | } | |
220 | dev = NULL; | |
221 | exit: | |
d71374da | 222 | up_read(&pci_bus_sem); |
1da177e4 LT |
223 | return dev; |
224 | } | |
225 | ||
226 | /** | |
227 | * pci_find_device - begin or continue searching for a PCI device by vendor/device id | |
228 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
229 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
230 | * @from: Previous PCI device found in search, or %NULL for new search. | |
231 | * | |
d75763d2 RD |
232 | * Iterates through the list of known PCI devices. If a PCI device is found |
233 | * with a matching @vendor and @device, a pointer to its device structure is | |
1da177e4 | 234 | * returned. Otherwise, %NULL is returned. |
d75763d2 RD |
235 | * A new search is initiated by passing %NULL as the @from argument. |
236 | * Otherwise if @from is not %NULL, searches continue from next device | |
237 | * on the global list. | |
1da177e4 | 238 | * |
d75763d2 RD |
239 | * NOTE: Do not use this function any more; use pci_get_device() instead, as |
240 | * the PCI device returned by this function can disappear at any moment in | |
1da177e4 LT |
241 | * time. |
242 | */ | |
243 | struct pci_dev * | |
244 | pci_find_device(unsigned int vendor, unsigned int device, const struct pci_dev *from) | |
245 | { | |
246 | return pci_find_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from); | |
247 | } | |
248 | ||
249 | /** | |
250 | * pci_get_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id | |
251 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
252 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
253 | * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
254 | * @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids | |
255 | * @from: Previous PCI device found in search, or %NULL for new search. | |
256 | * | |
d75763d2 RD |
257 | * Iterates through the list of known PCI devices. If a PCI device is found |
258 | * with a matching @vendor, @device, @ss_vendor and @ss_device, a pointer to its | |
1da177e4 LT |
259 | * device structure is returned, and the reference count to the device is |
260 | * incremented. Otherwise, %NULL is returned. A new search is initiated by | |
d75763d2 | 261 | * passing %NULL as the @from argument. Otherwise if @from is not %NULL, |
1da177e4 LT |
262 | * searches continue from next device on the global list. |
263 | * The reference count for @from is always decremented if it is not %NULL. | |
264 | */ | |
265 | struct pci_dev * | |
266 | pci_get_subsys(unsigned int vendor, unsigned int device, | |
267 | unsigned int ss_vendor, unsigned int ss_device, | |
268 | struct pci_dev *from) | |
269 | { | |
270 | struct list_head *n; | |
271 | struct pci_dev *dev; | |
272 | ||
273 | WARN_ON(in_interrupt()); | |
6ae4adf5 AB |
274 | |
275 | /* | |
276 | * pci_get_subsys() can potentially be called by drivers super-early | |
277 | * in boot. But the down_read() will enable local interrupts, which | |
278 | * can cause some machines to crash. So here we detect and flag that | |
279 | * situation and bail out early. | |
280 | */ | |
281 | if (unlikely(list_empty(&pci_devices))) { | |
282 | printk(KERN_NOTICE "pci_get_subsys() called while pci_devices " | |
283 | "is still empty\n"); | |
284 | return NULL; | |
285 | } | |
d71374da | 286 | down_read(&pci_bus_sem); |
1da177e4 LT |
287 | n = from ? from->global_list.next : pci_devices.next; |
288 | ||
289 | while (n && (n != &pci_devices)) { | |
290 | dev = pci_dev_g(n); | |
291 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
292 | (device == PCI_ANY_ID || dev->device == device) && | |
293 | (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) && | |
294 | (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device)) | |
295 | goto exit; | |
296 | n = n->next; | |
297 | } | |
298 | dev = NULL; | |
299 | exit: | |
1da177e4 | 300 | dev = pci_dev_get(dev); |
d71374da | 301 | up_read(&pci_bus_sem); |
b89b7ea0 | 302 | pci_dev_put(from); |
1da177e4 LT |
303 | return dev; |
304 | } | |
305 | ||
306 | /** | |
307 | * pci_get_device - begin or continue searching for a PCI device by vendor/device id | |
308 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
309 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
310 | * @from: Previous PCI device found in search, or %NULL for new search. | |
311 | * | |
312 | * Iterates through the list of known PCI devices. If a PCI device is | |
313 | * found with a matching @vendor and @device, the reference count to the | |
314 | * device is incremented and a pointer to its device structure is returned. | |
315 | * Otherwise, %NULL is returned. A new search is initiated by passing %NULL | |
d75763d2 | 316 | * as the @from argument. Otherwise if @from is not %NULL, searches continue |
1da177e4 LT |
317 | * from next device on the global list. The reference count for @from is |
318 | * always decremented if it is not %NULL. | |
319 | */ | |
320 | struct pci_dev * | |
321 | pci_get_device(unsigned int vendor, unsigned int device, struct pci_dev *from) | |
322 | { | |
323 | return pci_get_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from); | |
324 | } | |
325 | ||
29f3eb64 AC |
326 | /** |
327 | * pci_get_device_reverse - begin or continue searching for a PCI device by vendor/device id | |
328 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
329 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
330 | * @from: Previous PCI device found in search, or %NULL for new search. | |
331 | * | |
332 | * Iterates through the list of known PCI devices in the reverse order of | |
333 | * pci_get_device. | |
334 | * If a PCI device is found with a matching @vendor and @device, the reference | |
335 | * count to the device is incremented and a pointer to its device structure | |
336 | * is returned Otherwise, %NULL is returned. A new search is initiated by | |
337 | * passing %NULL as the @from argument. Otherwise if @from is not %NULL, | |
338 | * searches continue from next device on the global list. The reference | |
339 | * count for @from is always decremented if it is not %NULL. | |
340 | */ | |
341 | struct pci_dev * | |
342 | pci_get_device_reverse(unsigned int vendor, unsigned int device, struct pci_dev *from) | |
343 | { | |
344 | struct list_head *n; | |
345 | struct pci_dev *dev; | |
346 | ||
347 | WARN_ON(in_interrupt()); | |
348 | down_read(&pci_bus_sem); | |
349 | n = from ? from->global_list.prev : pci_devices.prev; | |
350 | ||
351 | while (n && (n != &pci_devices)) { | |
352 | dev = pci_dev_g(n); | |
353 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
354 | (device == PCI_ANY_ID || dev->device == device)) | |
355 | goto exit; | |
356 | n = n->prev; | |
357 | } | |
358 | dev = NULL; | |
359 | exit: | |
360 | dev = pci_dev_get(dev); | |
361 | up_read(&pci_bus_sem); | |
362 | pci_dev_put(from); | |
363 | return dev; | |
364 | } | |
1da177e4 LT |
365 | |
366 | /** | |
367 | * pci_find_device_reverse - begin or continue searching for a PCI device by vendor/device id | |
368 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
369 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
370 | * @from: Previous PCI device found in search, or %NULL for new search. | |
371 | * | |
d75763d2 RD |
372 | * Iterates through the list of known PCI devices in the reverse order of |
373 | * pci_find_device(). | |
1da177e4 LT |
374 | * If a PCI device is found with a matching @vendor and @device, a pointer to |
375 | * its device structure is returned. Otherwise, %NULL is returned. | |
d75763d2 RD |
376 | * A new search is initiated by passing %NULL as the @from argument. |
377 | * Otherwise if @from is not %NULL, searches continue from previous device | |
378 | * on the global list. | |
1da177e4 LT |
379 | */ |
380 | struct pci_dev * | |
381 | pci_find_device_reverse(unsigned int vendor, unsigned int device, const struct pci_dev *from) | |
382 | { | |
383 | struct list_head *n; | |
384 | struct pci_dev *dev; | |
385 | ||
386 | WARN_ON(in_interrupt()); | |
d71374da | 387 | down_read(&pci_bus_sem); |
1da177e4 LT |
388 | n = from ? from->global_list.prev : pci_devices.prev; |
389 | ||
390 | while (n && (n != &pci_devices)) { | |
391 | dev = pci_dev_g(n); | |
392 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
393 | (device == PCI_ANY_ID || dev->device == device)) | |
394 | goto exit; | |
395 | n = n->prev; | |
396 | } | |
397 | dev = NULL; | |
398 | exit: | |
d71374da | 399 | up_read(&pci_bus_sem); |
1da177e4 LT |
400 | return dev; |
401 | } | |
402 | ||
403 | /** | |
404 | * pci_get_class - begin or continue searching for a PCI device by class | |
405 | * @class: search for a PCI device with this class designation | |
406 | * @from: Previous PCI device found in search, or %NULL for new search. | |
407 | * | |
408 | * Iterates through the list of known PCI devices. If a PCI device is | |
409 | * found with a matching @class, the reference count to the device is | |
410 | * incremented and a pointer to its device structure is returned. | |
411 | * Otherwise, %NULL is returned. | |
d75763d2 | 412 | * A new search is initiated by passing %NULL as the @from argument. |
1da177e4 LT |
413 | * Otherwise if @from is not %NULL, searches continue from next device |
414 | * on the global list. The reference count for @from is always decremented | |
415 | * if it is not %NULL. | |
416 | */ | |
417 | struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from) | |
418 | { | |
419 | struct list_head *n; | |
420 | struct pci_dev *dev; | |
421 | ||
422 | WARN_ON(in_interrupt()); | |
d71374da | 423 | down_read(&pci_bus_sem); |
1da177e4 LT |
424 | n = from ? from->global_list.next : pci_devices.next; |
425 | ||
426 | while (n && (n != &pci_devices)) { | |
427 | dev = pci_dev_g(n); | |
428 | if (dev->class == class) | |
429 | goto exit; | |
430 | n = n->next; | |
431 | } | |
432 | dev = NULL; | |
433 | exit: | |
1da177e4 | 434 | dev = pci_dev_get(dev); |
d71374da | 435 | up_read(&pci_bus_sem); |
b89b7ea0 | 436 | pci_dev_put(from); |
1da177e4 LT |
437 | return dev; |
438 | } | |
439 | ||
d86f90f9 AC |
440 | const struct pci_device_id *pci_find_present(const struct pci_device_id *ids) |
441 | { | |
442 | struct pci_dev *dev; | |
1597cacb | 443 | const struct pci_device_id *found = NULL; |
d86f90f9 AC |
444 | |
445 | WARN_ON(in_interrupt()); | |
446 | down_read(&pci_bus_sem); | |
447 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
448 | list_for_each_entry(dev, &pci_devices, global_list) { | |
449 | if ((found = pci_match_one_device(ids, dev)) != NULL) | |
450 | break; | |
451 | } | |
452 | ids++; | |
453 | } | |
454 | up_read(&pci_bus_sem); | |
455 | return found; | |
456 | } | |
457 | ||
1da177e4 LT |
458 | /** |
459 | * pci_dev_present - Returns 1 if device matching the device list is present, 0 if not. | |
460 | * @ids: A pointer to a null terminated list of struct pci_device_id structures | |
461 | * that describe the type of PCI device the caller is trying to find. | |
462 | * | |
463 | * Obvious fact: You do not have a reference to any device that might be found | |
464 | * by this function, so if that device is removed from the system right after | |
465 | * this function is finished, the value will be stale. Use this function to | |
466 | * find devices that are usually built into a system, or for a general hint as | |
467 | * to if another device happens to be present at this specific moment in time. | |
468 | */ | |
469 | int pci_dev_present(const struct pci_device_id *ids) | |
470 | { | |
d86f90f9 | 471 | return pci_find_present(ids) == NULL ? 0 : 1; |
1da177e4 | 472 | } |
d86f90f9 | 473 | |
1da177e4 | 474 | EXPORT_SYMBOL(pci_dev_present); |
d86f90f9 | 475 | EXPORT_SYMBOL(pci_find_present); |
1da177e4 | 476 | |
1da177e4 LT |
477 | EXPORT_SYMBOL(pci_find_device); |
478 | EXPORT_SYMBOL(pci_find_device_reverse); | |
479 | EXPORT_SYMBOL(pci_find_slot); | |
29f3eb64 AC |
480 | /* For boot time work */ |
481 | EXPORT_SYMBOL(pci_find_bus); | |
482 | EXPORT_SYMBOL(pci_find_next_bus); | |
483 | /* For everyone */ | |
1da177e4 | 484 | EXPORT_SYMBOL(pci_get_device); |
29f3eb64 | 485 | EXPORT_SYMBOL(pci_get_device_reverse); |
1da177e4 LT |
486 | EXPORT_SYMBOL(pci_get_subsys); |
487 | EXPORT_SYMBOL(pci_get_slot); | |
29f3eb64 | 488 | EXPORT_SYMBOL(pci_get_bus_and_slot); |
1da177e4 | 489 | EXPORT_SYMBOL(pci_get_class); |