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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 | |
128bf5cb | 18 | static struct pci_bus * |
1da177e4 LT |
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 | */ | |
6a4c24ec | 203 | if (unlikely(list_empty(&pci_devices))) |
6ae4adf5 | 204 | return NULL; |
d71374da | 205 | down_read(&pci_bus_sem); |
1da177e4 LT |
206 | n = from ? from->global_list.next : pci_devices.next; |
207 | ||
208 | while (n && (n != &pci_devices)) { | |
209 | dev = pci_dev_g(n); | |
210 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
211 | (device == PCI_ANY_ID || dev->device == device) && | |
212 | (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) && | |
213 | (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device)) | |
214 | goto exit; | |
215 | n = n->next; | |
216 | } | |
217 | dev = NULL; | |
218 | exit: | |
d71374da | 219 | up_read(&pci_bus_sem); |
1da177e4 LT |
220 | return dev; |
221 | } | |
222 | ||
223 | /** | |
224 | * pci_find_device - begin or continue searching for a PCI device by vendor/device id | |
225 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
226 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
227 | * @from: Previous PCI device found in search, or %NULL for new search. | |
228 | * | |
d75763d2 RD |
229 | * Iterates through the list of known PCI devices. If a PCI device is found |
230 | * with a matching @vendor and @device, a pointer to its device structure is | |
1da177e4 | 231 | * returned. Otherwise, %NULL is returned. |
d75763d2 RD |
232 | * A new search is initiated by passing %NULL as the @from argument. |
233 | * Otherwise if @from is not %NULL, searches continue from next device | |
234 | * on the global list. | |
1da177e4 | 235 | * |
d75763d2 RD |
236 | * NOTE: Do not use this function any more; use pci_get_device() instead, as |
237 | * the PCI device returned by this function can disappear at any moment in | |
1da177e4 LT |
238 | * time. |
239 | */ | |
240 | struct pci_dev * | |
241 | pci_find_device(unsigned int vendor, unsigned int device, const struct pci_dev *from) | |
242 | { | |
243 | return pci_find_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from); | |
244 | } | |
245 | ||
246 | /** | |
247 | * pci_get_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id | |
248 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
249 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
250 | * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
251 | * @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids | |
252 | * @from: Previous PCI device found in search, or %NULL for new search. | |
253 | * | |
d75763d2 RD |
254 | * Iterates through the list of known PCI devices. If a PCI device is found |
255 | * with a matching @vendor, @device, @ss_vendor and @ss_device, a pointer to its | |
1da177e4 LT |
256 | * device structure is returned, and the reference count to the device is |
257 | * incremented. Otherwise, %NULL is returned. A new search is initiated by | |
d75763d2 | 258 | * passing %NULL as the @from argument. Otherwise if @from is not %NULL, |
1da177e4 LT |
259 | * searches continue from next device on the global list. |
260 | * The reference count for @from is always decremented if it is not %NULL. | |
261 | */ | |
262 | struct pci_dev * | |
263 | pci_get_subsys(unsigned int vendor, unsigned int device, | |
264 | unsigned int ss_vendor, unsigned int ss_device, | |
265 | struct pci_dev *from) | |
266 | { | |
267 | struct list_head *n; | |
268 | struct pci_dev *dev; | |
269 | ||
270 | WARN_ON(in_interrupt()); | |
6ae4adf5 AB |
271 | |
272 | /* | |
273 | * pci_get_subsys() can potentially be called by drivers super-early | |
274 | * in boot. But the down_read() will enable local interrupts, which | |
275 | * can cause some machines to crash. So here we detect and flag that | |
276 | * situation and bail out early. | |
277 | */ | |
6a4c24ec | 278 | if (unlikely(list_empty(&pci_devices))) |
6ae4adf5 | 279 | return NULL; |
d71374da | 280 | down_read(&pci_bus_sem); |
1da177e4 LT |
281 | n = from ? from->global_list.next : pci_devices.next; |
282 | ||
283 | while (n && (n != &pci_devices)) { | |
284 | dev = pci_dev_g(n); | |
285 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
286 | (device == PCI_ANY_ID || dev->device == device) && | |
287 | (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) && | |
288 | (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device)) | |
289 | goto exit; | |
290 | n = n->next; | |
291 | } | |
292 | dev = NULL; | |
293 | exit: | |
1da177e4 | 294 | dev = pci_dev_get(dev); |
d71374da | 295 | up_read(&pci_bus_sem); |
b89b7ea0 | 296 | pci_dev_put(from); |
1da177e4 LT |
297 | return dev; |
298 | } | |
299 | ||
300 | /** | |
301 | * pci_get_device - begin or continue searching for a PCI device by vendor/device id | |
302 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
303 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
304 | * @from: Previous PCI device found in search, or %NULL for new search. | |
305 | * | |
306 | * Iterates through the list of known PCI devices. If a PCI device is | |
307 | * found with a matching @vendor and @device, the reference count to the | |
308 | * device is incremented and a pointer to its device structure is returned. | |
309 | * Otherwise, %NULL is returned. A new search is initiated by passing %NULL | |
d75763d2 | 310 | * as the @from argument. Otherwise if @from is not %NULL, searches continue |
1da177e4 LT |
311 | * from next device on the global list. The reference count for @from is |
312 | * always decremented if it is not %NULL. | |
313 | */ | |
314 | struct pci_dev * | |
315 | pci_get_device(unsigned int vendor, unsigned int device, struct pci_dev *from) | |
316 | { | |
317 | return pci_get_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from); | |
318 | } | |
319 | ||
29f3eb64 AC |
320 | /** |
321 | * pci_get_device_reverse - begin or continue searching for a PCI device by vendor/device id | |
322 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
323 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
324 | * @from: Previous PCI device found in search, or %NULL for new search. | |
325 | * | |
326 | * Iterates through the list of known PCI devices in the reverse order of | |
327 | * pci_get_device. | |
328 | * If a PCI device is found with a matching @vendor and @device, the reference | |
329 | * count to the device is incremented and a pointer to its device structure | |
330 | * is returned Otherwise, %NULL is returned. A new search is initiated by | |
331 | * passing %NULL as the @from argument. Otherwise if @from is not %NULL, | |
332 | * searches continue from next device on the global list. The reference | |
333 | * count for @from is always decremented if it is not %NULL. | |
334 | */ | |
335 | struct pci_dev * | |
336 | pci_get_device_reverse(unsigned int vendor, unsigned int device, struct pci_dev *from) | |
337 | { | |
338 | struct list_head *n; | |
339 | struct pci_dev *dev; | |
340 | ||
341 | WARN_ON(in_interrupt()); | |
342 | down_read(&pci_bus_sem); | |
343 | n = from ? from->global_list.prev : pci_devices.prev; | |
344 | ||
345 | while (n && (n != &pci_devices)) { | |
346 | dev = pci_dev_g(n); | |
347 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
348 | (device == PCI_ANY_ID || dev->device == device)) | |
349 | goto exit; | |
350 | n = n->prev; | |
351 | } | |
352 | dev = NULL; | |
353 | exit: | |
354 | dev = pci_dev_get(dev); | |
355 | up_read(&pci_bus_sem); | |
356 | pci_dev_put(from); | |
357 | return dev; | |
358 | } | |
1da177e4 | 359 | |
1da177e4 LT |
360 | /** |
361 | * pci_get_class - begin or continue searching for a PCI device by class | |
362 | * @class: search for a PCI device with this class designation | |
363 | * @from: Previous PCI device found in search, or %NULL for new search. | |
364 | * | |
365 | * Iterates through the list of known PCI devices. If a PCI device is | |
366 | * found with a matching @class, the reference count to the device is | |
367 | * incremented and a pointer to its device structure is returned. | |
368 | * Otherwise, %NULL is returned. | |
d75763d2 | 369 | * A new search is initiated by passing %NULL as the @from argument. |
1da177e4 LT |
370 | * Otherwise if @from is not %NULL, searches continue from next device |
371 | * on the global list. The reference count for @from is always decremented | |
372 | * if it is not %NULL. | |
373 | */ | |
374 | struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from) | |
375 | { | |
376 | struct list_head *n; | |
377 | struct pci_dev *dev; | |
378 | ||
379 | WARN_ON(in_interrupt()); | |
d71374da | 380 | down_read(&pci_bus_sem); |
1da177e4 LT |
381 | n = from ? from->global_list.next : pci_devices.next; |
382 | ||
383 | while (n && (n != &pci_devices)) { | |
384 | dev = pci_dev_g(n); | |
385 | if (dev->class == class) | |
386 | goto exit; | |
387 | n = n->next; | |
388 | } | |
389 | dev = NULL; | |
390 | exit: | |
1da177e4 | 391 | dev = pci_dev_get(dev); |
d71374da | 392 | up_read(&pci_bus_sem); |
b89b7ea0 | 393 | pci_dev_put(from); |
1da177e4 LT |
394 | return dev; |
395 | } | |
396 | ||
d86f90f9 AC |
397 | const struct pci_device_id *pci_find_present(const struct pci_device_id *ids) |
398 | { | |
399 | struct pci_dev *dev; | |
1597cacb | 400 | const struct pci_device_id *found = NULL; |
d86f90f9 AC |
401 | |
402 | WARN_ON(in_interrupt()); | |
403 | down_read(&pci_bus_sem); | |
404 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
405 | list_for_each_entry(dev, &pci_devices, global_list) { | |
406 | if ((found = pci_match_one_device(ids, dev)) != NULL) | |
407 | break; | |
408 | } | |
409 | ids++; | |
410 | } | |
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); |