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 | 17 | |
96bde06a | 18 | static struct pci_bus *pci_do_find_bus(struct pci_bus *bus, unsigned char busnr) |
1da177e4 LT |
19 | { |
20 | struct pci_bus* child; | |
21 | struct list_head *tmp; | |
22 | ||
23 | if(bus->number == busnr) | |
24 | return bus; | |
25 | ||
26 | list_for_each(tmp, &bus->children) { | |
27 | child = pci_do_find_bus(pci_bus_b(tmp), busnr); | |
28 | if(child) | |
29 | return child; | |
30 | } | |
31 | return NULL; | |
32 | } | |
33 | ||
34 | /** | |
35 | * pci_find_bus - locate PCI bus from a given domain and bus number | |
36 | * @domain: number of PCI domain to search | |
37 | * @busnr: number of desired PCI bus | |
38 | * | |
39 | * Given a PCI bus number and domain number, the desired PCI bus is located | |
40 | * in the global list of PCI buses. If the bus is found, a pointer to its | |
41 | * data structure is returned. If no bus is found, %NULL is returned. | |
42 | */ | |
c8439cfc | 43 | struct pci_bus * pci_find_bus(int domain, int busnr) |
1da177e4 LT |
44 | { |
45 | struct pci_bus *bus = NULL; | |
46 | struct pci_bus *tmp_bus; | |
47 | ||
48 | while ((bus = pci_find_next_bus(bus)) != NULL) { | |
49 | if (pci_domain_nr(bus) != domain) | |
50 | continue; | |
51 | tmp_bus = pci_do_find_bus(bus, busnr); | |
52 | if (tmp_bus) | |
53 | return tmp_bus; | |
54 | } | |
55 | return NULL; | |
56 | } | |
57 | ||
58 | /** | |
59 | * pci_find_next_bus - begin or continue searching for a PCI bus | |
60 | * @from: Previous PCI bus found, or %NULL for new search. | |
61 | * | |
62 | * Iterates through the list of known PCI busses. A new search is | |
d75763d2 | 63 | * initiated by passing %NULL as the @from argument. Otherwise if |
1da177e4 LT |
64 | * @from is not %NULL, searches continue from next device on the |
65 | * global list. | |
66 | */ | |
67 | struct pci_bus * | |
68 | pci_find_next_bus(const struct pci_bus *from) | |
69 | { | |
70 | struct list_head *n; | |
71 | struct pci_bus *b = NULL; | |
72 | ||
73 | WARN_ON(in_interrupt()); | |
d71374da | 74 | down_read(&pci_bus_sem); |
1da177e4 LT |
75 | n = from ? from->node.next : pci_root_buses.next; |
76 | if (n != &pci_root_buses) | |
77 | b = pci_bus_b(n); | |
d71374da | 78 | up_read(&pci_bus_sem); |
1da177e4 LT |
79 | return b; |
80 | } | |
81 | ||
82 | /** | |
83 | * pci_find_slot - locate PCI device from a given PCI slot | |
84 | * @bus: number of PCI bus on which desired PCI device resides | |
85 | * @devfn: encodes number of PCI slot in which the desired PCI | |
86 | * device resides and the logical device number within that slot | |
87 | * in case of multi-function devices. | |
88 | * | |
89 | * Given a PCI bus and slot/function number, the desired PCI device | |
90 | * is located in system global list of PCI devices. If the device | |
91 | * is found, a pointer to its data structure is returned. If no | |
92 | * device is found, %NULL is returned. | |
93 | */ | |
94 | struct pci_dev * | |
95 | pci_find_slot(unsigned int bus, unsigned int devfn) | |
96 | { | |
97 | struct pci_dev *dev = NULL; | |
98 | ||
99 | while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { | |
100 | if (dev->bus->number == bus && dev->devfn == devfn) | |
101 | return dev; | |
102 | } | |
103 | return NULL; | |
104 | } | |
105 | ||
106 | /** | |
107 | * pci_get_slot - locate PCI device for a given PCI slot | |
108 | * @bus: PCI bus on which desired PCI device resides | |
109 | * @devfn: encodes number of PCI slot in which the desired PCI | |
110 | * device resides and the logical device number within that slot | |
111 | * in case of multi-function devices. | |
112 | * | |
113 | * Given a PCI bus and slot/function number, the desired PCI device | |
114 | * is located in the list of PCI devices. | |
115 | * If the device is found, its reference count is increased and this | |
116 | * function returns a pointer to its data structure. The caller must | |
117 | * decrement the reference count by calling pci_dev_put(). | |
118 | * If no device is found, %NULL is returned. | |
119 | */ | |
120 | struct pci_dev * pci_get_slot(struct pci_bus *bus, unsigned int devfn) | |
121 | { | |
122 | struct list_head *tmp; | |
123 | struct pci_dev *dev; | |
124 | ||
125 | WARN_ON(in_interrupt()); | |
d71374da | 126 | down_read(&pci_bus_sem); |
1da177e4 LT |
127 | |
128 | list_for_each(tmp, &bus->devices) { | |
129 | dev = pci_dev_b(tmp); | |
130 | if (dev->devfn == devfn) | |
131 | goto out; | |
132 | } | |
133 | ||
134 | dev = NULL; | |
135 | out: | |
136 | pci_dev_get(dev); | |
d71374da | 137 | up_read(&pci_bus_sem); |
1da177e4 LT |
138 | return dev; |
139 | } | |
140 | ||
29f3eb64 AC |
141 | /** |
142 | * pci_get_bus_and_slot - locate PCI device from a given PCI slot | |
143 | * @bus: number of PCI bus on which desired PCI device resides | |
144 | * @devfn: encodes number of PCI slot in which the desired PCI | |
145 | * device resides and the logical device number within that slot | |
146 | * in case of multi-function devices. | |
147 | * | |
148 | * Given a PCI bus and slot/function number, the desired PCI device | |
149 | * is located in system global list of PCI devices. If the device | |
150 | * is found, a pointer to its data structure is returned. If no | |
151 | * device is found, %NULL is returned. The returned device has its | |
152 | * reference count bumped by one. | |
153 | */ | |
154 | ||
155 | struct pci_dev * pci_get_bus_and_slot(unsigned int bus, unsigned int devfn) | |
156 | { | |
157 | struct pci_dev *dev = NULL; | |
158 | ||
159 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { | |
160 | if (dev->bus->number == bus && dev->devfn == devfn) | |
161 | return dev; | |
162 | } | |
163 | return NULL; | |
164 | } | |
165 | ||
1da177e4 LT |
166 | /** |
167 | * pci_find_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id | |
168 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
169 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
170 | * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
171 | * @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids | |
172 | * @from: Previous PCI device found in search, or %NULL for new search. | |
173 | * | |
174 | * Iterates through the list of known PCI devices. If a PCI device is | |
d75763d2 RD |
175 | * found with a matching @vendor, @device, @ss_vendor and @ss_device, a |
176 | * pointer to its device structure is returned. Otherwise, %NULL is returned. | |
177 | * A new search is initiated by passing %NULL as the @from argument. | |
178 | * Otherwise if @from is not %NULL, searches continue from next device | |
179 | * on the global list. | |
1da177e4 | 180 | * |
d75763d2 RD |
181 | * NOTE: Do not use this function any more; use pci_get_subsys() instead, as |
182 | * the PCI device returned by this function can disappear at any moment in | |
1da177e4 LT |
183 | * time. |
184 | */ | |
185 | static struct pci_dev * pci_find_subsys(unsigned int vendor, | |
186 | unsigned int device, | |
187 | unsigned int ss_vendor, | |
188 | unsigned int ss_device, | |
189 | const struct pci_dev *from) | |
190 | { | |
191 | struct list_head *n; | |
192 | struct pci_dev *dev; | |
193 | ||
194 | WARN_ON(in_interrupt()); | |
6ae4adf5 AB |
195 | |
196 | /* | |
197 | * pci_find_subsys() can be called on the ide_setup() path, super-early | |
198 | * in boot. But the down_read() will enable local interrupts, which | |
199 | * can cause some machines to crash. So here we detect and flag that | |
200 | * situation and bail out early. | |
201 | */ | |
6a4c24ec | 202 | if (unlikely(list_empty(&pci_devices))) |
6ae4adf5 | 203 | return NULL; |
d71374da | 204 | down_read(&pci_bus_sem); |
1da177e4 LT |
205 | n = from ? from->global_list.next : pci_devices.next; |
206 | ||
207 | while (n && (n != &pci_devices)) { | |
208 | dev = pci_dev_g(n); | |
209 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
210 | (device == PCI_ANY_ID || dev->device == device) && | |
211 | (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) && | |
212 | (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device)) | |
213 | goto exit; | |
214 | n = n->next; | |
215 | } | |
216 | dev = NULL; | |
217 | exit: | |
d71374da | 218 | up_read(&pci_bus_sem); |
1da177e4 LT |
219 | return dev; |
220 | } | |
221 | ||
222 | /** | |
223 | * pci_find_device - begin or continue searching for a PCI device by vendor/device id | |
224 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
225 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
226 | * @from: Previous PCI device found in search, or %NULL for new search. | |
227 | * | |
d75763d2 RD |
228 | * Iterates through the list of known PCI devices. If a PCI device is found |
229 | * with a matching @vendor and @device, a pointer to its device structure is | |
1da177e4 | 230 | * returned. Otherwise, %NULL is returned. |
d75763d2 RD |
231 | * A new search is initiated by passing %NULL as the @from argument. |
232 | * Otherwise if @from is not %NULL, searches continue from next device | |
233 | * on the global list. | |
1da177e4 | 234 | * |
d75763d2 RD |
235 | * NOTE: Do not use this function any more; use pci_get_device() instead, as |
236 | * the PCI device returned by this function can disappear at any moment in | |
1da177e4 LT |
237 | * time. |
238 | */ | |
239 | struct pci_dev * | |
240 | pci_find_device(unsigned int vendor, unsigned int device, const struct pci_dev *from) | |
241 | { | |
242 | return pci_find_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from); | |
243 | } | |
244 | ||
245 | /** | |
246 | * pci_get_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id | |
247 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
248 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
249 | * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
250 | * @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids | |
251 | * @from: Previous PCI device found in search, or %NULL for new search. | |
252 | * | |
d75763d2 RD |
253 | * Iterates through the list of known PCI devices. If a PCI device is found |
254 | * with a matching @vendor, @device, @ss_vendor and @ss_device, a pointer to its | |
1da177e4 LT |
255 | * device structure is returned, and the reference count to the device is |
256 | * incremented. Otherwise, %NULL is returned. A new search is initiated by | |
d75763d2 | 257 | * passing %NULL as the @from argument. Otherwise if @from is not %NULL, |
1da177e4 LT |
258 | * searches continue from next device on the global list. |
259 | * The reference count for @from is always decremented if it is not %NULL. | |
260 | */ | |
261 | struct pci_dev * | |
262 | pci_get_subsys(unsigned int vendor, unsigned int device, | |
263 | unsigned int ss_vendor, unsigned int ss_device, | |
264 | struct pci_dev *from) | |
265 | { | |
266 | struct list_head *n; | |
267 | struct pci_dev *dev; | |
268 | ||
269 | WARN_ON(in_interrupt()); | |
6ae4adf5 AB |
270 | |
271 | /* | |
272 | * pci_get_subsys() can potentially be called by drivers super-early | |
273 | * in boot. But the down_read() will enable local interrupts, which | |
274 | * can cause some machines to crash. So here we detect and flag that | |
275 | * situation and bail out early. | |
276 | */ | |
6a4c24ec | 277 | if (unlikely(list_empty(&pci_devices))) |
6ae4adf5 | 278 | return NULL; |
d71374da | 279 | down_read(&pci_bus_sem); |
1da177e4 LT |
280 | n = from ? from->global_list.next : pci_devices.next; |
281 | ||
282 | while (n && (n != &pci_devices)) { | |
283 | dev = pci_dev_g(n); | |
284 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
285 | (device == PCI_ANY_ID || dev->device == device) && | |
286 | (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) && | |
287 | (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device)) | |
288 | goto exit; | |
289 | n = n->next; | |
290 | } | |
291 | dev = NULL; | |
292 | exit: | |
1da177e4 | 293 | dev = pci_dev_get(dev); |
d71374da | 294 | up_read(&pci_bus_sem); |
b89b7ea0 | 295 | pci_dev_put(from); |
1da177e4 LT |
296 | return dev; |
297 | } | |
298 | ||
299 | /** | |
300 | * pci_get_device - begin or continue searching for a PCI device by vendor/device id | |
301 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
302 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
303 | * @from: Previous PCI device found in search, or %NULL for new search. | |
304 | * | |
305 | * Iterates through the list of known PCI devices. If a PCI device is | |
306 | * found with a matching @vendor and @device, the reference count to the | |
307 | * device is incremented and a pointer to its device structure is returned. | |
308 | * Otherwise, %NULL is returned. A new search is initiated by passing %NULL | |
d75763d2 | 309 | * as the @from argument. Otherwise if @from is not %NULL, searches continue |
1da177e4 LT |
310 | * from next device on the global list. The reference count for @from is |
311 | * always decremented if it is not %NULL. | |
312 | */ | |
313 | struct pci_dev * | |
314 | pci_get_device(unsigned int vendor, unsigned int device, struct pci_dev *from) | |
315 | { | |
316 | return pci_get_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from); | |
317 | } | |
318 | ||
29f3eb64 AC |
319 | /** |
320 | * pci_get_device_reverse - begin or continue searching for a PCI device by vendor/device id | |
321 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
322 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
323 | * @from: Previous PCI device found in search, or %NULL for new search. | |
324 | * | |
325 | * Iterates through the list of known PCI devices in the reverse order of | |
326 | * pci_get_device. | |
327 | * If a PCI device is found with a matching @vendor and @device, the reference | |
328 | * count to the device is incremented and a pointer to its device structure | |
329 | * is returned Otherwise, %NULL is returned. A new search is initiated by | |
330 | * passing %NULL as the @from argument. Otherwise if @from is not %NULL, | |
331 | * searches continue from next device on the global list. The reference | |
332 | * count for @from is always decremented if it is not %NULL. | |
333 | */ | |
334 | struct pci_dev * | |
335 | pci_get_device_reverse(unsigned int vendor, unsigned int device, struct pci_dev *from) | |
336 | { | |
337 | struct list_head *n; | |
338 | struct pci_dev *dev; | |
339 | ||
340 | WARN_ON(in_interrupt()); | |
341 | down_read(&pci_bus_sem); | |
342 | n = from ? from->global_list.prev : pci_devices.prev; | |
343 | ||
344 | while (n && (n != &pci_devices)) { | |
345 | dev = pci_dev_g(n); | |
346 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
347 | (device == PCI_ANY_ID || dev->device == device)) | |
348 | goto exit; | |
349 | n = n->prev; | |
350 | } | |
351 | dev = NULL; | |
352 | exit: | |
353 | dev = pci_dev_get(dev); | |
354 | up_read(&pci_bus_sem); | |
355 | pci_dev_put(from); | |
356 | return dev; | |
357 | } | |
1da177e4 | 358 | |
1da177e4 LT |
359 | /** |
360 | * pci_get_class - begin or continue searching for a PCI device by class | |
361 | * @class: search for a PCI device with this class designation | |
362 | * @from: Previous PCI device found in search, or %NULL for new search. | |
363 | * | |
364 | * Iterates through the list of known PCI devices. If a PCI device is | |
365 | * found with a matching @class, the reference count to the device is | |
366 | * incremented and a pointer to its device structure is returned. | |
367 | * Otherwise, %NULL is returned. | |
d75763d2 | 368 | * A new search is initiated by passing %NULL as the @from argument. |
1da177e4 LT |
369 | * Otherwise if @from is not %NULL, searches continue from next device |
370 | * on the global list. The reference count for @from is always decremented | |
371 | * if it is not %NULL. | |
372 | */ | |
373 | struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from) | |
374 | { | |
375 | struct list_head *n; | |
376 | struct pci_dev *dev; | |
377 | ||
378 | WARN_ON(in_interrupt()); | |
d71374da | 379 | down_read(&pci_bus_sem); |
1da177e4 LT |
380 | n = from ? from->global_list.next : pci_devices.next; |
381 | ||
382 | while (n && (n != &pci_devices)) { | |
383 | dev = pci_dev_g(n); | |
384 | if (dev->class == class) | |
385 | goto exit; | |
386 | n = n->next; | |
387 | } | |
388 | dev = NULL; | |
389 | exit: | |
1da177e4 | 390 | dev = pci_dev_get(dev); |
d71374da | 391 | up_read(&pci_bus_sem); |
b89b7ea0 | 392 | pci_dev_put(from); |
1da177e4 LT |
393 | return dev; |
394 | } | |
395 | ||
d86f90f9 AC |
396 | const struct pci_device_id *pci_find_present(const struct pci_device_id *ids) |
397 | { | |
398 | struct pci_dev *dev; | |
1597cacb | 399 | const struct pci_device_id *found = NULL; |
d86f90f9 AC |
400 | |
401 | WARN_ON(in_interrupt()); | |
402 | down_read(&pci_bus_sem); | |
403 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
404 | list_for_each_entry(dev, &pci_devices, global_list) { | |
405 | if ((found = pci_match_one_device(ids, dev)) != NULL) | |
3c92c57a | 406 | goto exit; |
d86f90f9 AC |
407 | } |
408 | ids++; | |
409 | } | |
3c92c57a | 410 | exit: |
d86f90f9 AC |
411 | up_read(&pci_bus_sem); |
412 | return found; | |
413 | } | |
414 | ||
1da177e4 LT |
415 | /** |
416 | * pci_dev_present - Returns 1 if device matching the device list is present, 0 if not. | |
417 | * @ids: A pointer to a null terminated list of struct pci_device_id structures | |
418 | * that describe the type of PCI device the caller is trying to find. | |
419 | * | |
420 | * Obvious fact: You do not have a reference to any device that might be found | |
421 | * by this function, so if that device is removed from the system right after | |
422 | * this function is finished, the value will be stale. Use this function to | |
423 | * find devices that are usually built into a system, or for a general hint as | |
424 | * to if another device happens to be present at this specific moment in time. | |
425 | */ | |
426 | int pci_dev_present(const struct pci_device_id *ids) | |
427 | { | |
d86f90f9 | 428 | return pci_find_present(ids) == NULL ? 0 : 1; |
1da177e4 | 429 | } |
d86f90f9 | 430 | |
1da177e4 | 431 | EXPORT_SYMBOL(pci_dev_present); |
d86f90f9 | 432 | EXPORT_SYMBOL(pci_find_present); |
1da177e4 | 433 | |
1da177e4 | 434 | EXPORT_SYMBOL(pci_find_device); |
1da177e4 | 435 | EXPORT_SYMBOL(pci_find_slot); |
29f3eb64 AC |
436 | /* For boot time work */ |
437 | EXPORT_SYMBOL(pci_find_bus); | |
438 | EXPORT_SYMBOL(pci_find_next_bus); | |
439 | /* For everyone */ | |
1da177e4 | 440 | EXPORT_SYMBOL(pci_get_device); |
29f3eb64 | 441 | EXPORT_SYMBOL(pci_get_device_reverse); |
1da177e4 LT |
442 | EXPORT_SYMBOL(pci_get_subsys); |
443 | EXPORT_SYMBOL(pci_get_slot); | |
29f3eb64 | 444 | EXPORT_SYMBOL(pci_get_bus_and_slot); |
1da177e4 | 445 | EXPORT_SYMBOL(pci_get_class); |