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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 | ||
142 | /** | |
143 | * pci_find_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id | |
144 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
145 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
146 | * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
147 | * @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids | |
148 | * @from: Previous PCI device found in search, or %NULL for new search. | |
149 | * | |
150 | * Iterates through the list of known PCI devices. If a PCI device is | |
d75763d2 RD |
151 | * found with a matching @vendor, @device, @ss_vendor and @ss_device, a |
152 | * pointer to its device structure is returned. Otherwise, %NULL is returned. | |
153 | * A new search is initiated by passing %NULL as the @from argument. | |
154 | * Otherwise if @from is not %NULL, searches continue from next device | |
155 | * on the global list. | |
1da177e4 | 156 | * |
d75763d2 RD |
157 | * NOTE: Do not use this function any more; use pci_get_subsys() instead, as |
158 | * the PCI device returned by this function can disappear at any moment in | |
1da177e4 LT |
159 | * time. |
160 | */ | |
161 | static struct pci_dev * pci_find_subsys(unsigned int vendor, | |
162 | unsigned int device, | |
163 | unsigned int ss_vendor, | |
164 | unsigned int ss_device, | |
165 | const struct pci_dev *from) | |
166 | { | |
167 | struct list_head *n; | |
168 | struct pci_dev *dev; | |
169 | ||
170 | WARN_ON(in_interrupt()); | |
d71374da | 171 | down_read(&pci_bus_sem); |
1da177e4 LT |
172 | n = from ? from->global_list.next : pci_devices.next; |
173 | ||
174 | while (n && (n != &pci_devices)) { | |
175 | dev = pci_dev_g(n); | |
176 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
177 | (device == PCI_ANY_ID || dev->device == device) && | |
178 | (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) && | |
179 | (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device)) | |
180 | goto exit; | |
181 | n = n->next; | |
182 | } | |
183 | dev = NULL; | |
184 | exit: | |
d71374da | 185 | up_read(&pci_bus_sem); |
1da177e4 LT |
186 | return dev; |
187 | } | |
188 | ||
189 | /** | |
190 | * pci_find_device - begin or continue searching for a PCI device by vendor/device id | |
191 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
192 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
193 | * @from: Previous PCI device found in search, or %NULL for new search. | |
194 | * | |
d75763d2 RD |
195 | * Iterates through the list of known PCI devices. If a PCI device is found |
196 | * with a matching @vendor and @device, a pointer to its device structure is | |
1da177e4 | 197 | * returned. Otherwise, %NULL is returned. |
d75763d2 RD |
198 | * A new search is initiated by passing %NULL as the @from argument. |
199 | * Otherwise if @from is not %NULL, searches continue from next device | |
200 | * on the global list. | |
1da177e4 | 201 | * |
d75763d2 RD |
202 | * NOTE: Do not use this function any more; use pci_get_device() instead, as |
203 | * the PCI device returned by this function can disappear at any moment in | |
1da177e4 LT |
204 | * time. |
205 | */ | |
206 | struct pci_dev * | |
207 | pci_find_device(unsigned int vendor, unsigned int device, const struct pci_dev *from) | |
208 | { | |
209 | return pci_find_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from); | |
210 | } | |
211 | ||
212 | /** | |
213 | * pci_get_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id | |
214 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
215 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
216 | * @ss_vendor: PCI subsystem vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
217 | * @ss_device: PCI subsystem device id to match, or %PCI_ANY_ID to match all device ids | |
218 | * @from: Previous PCI device found in search, or %NULL for new search. | |
219 | * | |
d75763d2 RD |
220 | * Iterates through the list of known PCI devices. If a PCI device is found |
221 | * with a matching @vendor, @device, @ss_vendor and @ss_device, a pointer to its | |
1da177e4 LT |
222 | * device structure is returned, and the reference count to the device is |
223 | * incremented. Otherwise, %NULL is returned. A new search is initiated by | |
d75763d2 | 224 | * passing %NULL as the @from argument. Otherwise if @from is not %NULL, |
1da177e4 LT |
225 | * searches continue from next device on the global list. |
226 | * The reference count for @from is always decremented if it is not %NULL. | |
227 | */ | |
228 | struct pci_dev * | |
229 | pci_get_subsys(unsigned int vendor, unsigned int device, | |
230 | unsigned int ss_vendor, unsigned int ss_device, | |
231 | struct pci_dev *from) | |
232 | { | |
233 | struct list_head *n; | |
234 | struct pci_dev *dev; | |
235 | ||
236 | WARN_ON(in_interrupt()); | |
d71374da | 237 | down_read(&pci_bus_sem); |
1da177e4 LT |
238 | n = from ? from->global_list.next : pci_devices.next; |
239 | ||
240 | while (n && (n != &pci_devices)) { | |
241 | dev = pci_dev_g(n); | |
242 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
243 | (device == PCI_ANY_ID || dev->device == device) && | |
244 | (ss_vendor == PCI_ANY_ID || dev->subsystem_vendor == ss_vendor) && | |
245 | (ss_device == PCI_ANY_ID || dev->subsystem_device == ss_device)) | |
246 | goto exit; | |
247 | n = n->next; | |
248 | } | |
249 | dev = NULL; | |
250 | exit: | |
1da177e4 | 251 | dev = pci_dev_get(dev); |
d71374da | 252 | up_read(&pci_bus_sem); |
b89b7ea0 | 253 | pci_dev_put(from); |
1da177e4 LT |
254 | return dev; |
255 | } | |
256 | ||
257 | /** | |
258 | * pci_get_device - begin or continue searching for a PCI device by vendor/device id | |
259 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
260 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
261 | * @from: Previous PCI device found in search, or %NULL for new search. | |
262 | * | |
263 | * Iterates through the list of known PCI devices. If a PCI device is | |
264 | * found with a matching @vendor and @device, the reference count to the | |
265 | * device is incremented and a pointer to its device structure is returned. | |
266 | * Otherwise, %NULL is returned. A new search is initiated by passing %NULL | |
d75763d2 | 267 | * as the @from argument. Otherwise if @from is not %NULL, searches continue |
1da177e4 LT |
268 | * from next device on the global list. The reference count for @from is |
269 | * always decremented if it is not %NULL. | |
270 | */ | |
271 | struct pci_dev * | |
272 | pci_get_device(unsigned int vendor, unsigned int device, struct pci_dev *from) | |
273 | { | |
274 | return pci_get_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from); | |
275 | } | |
276 | ||
277 | ||
278 | /** | |
279 | * pci_find_device_reverse - begin or continue searching for a PCI device by vendor/device id | |
280 | * @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids | |
281 | * @device: PCI device id to match, or %PCI_ANY_ID to match all device ids | |
282 | * @from: Previous PCI device found in search, or %NULL for new search. | |
283 | * | |
d75763d2 RD |
284 | * Iterates through the list of known PCI devices in the reverse order of |
285 | * pci_find_device(). | |
1da177e4 LT |
286 | * If a PCI device is found with a matching @vendor and @device, a pointer to |
287 | * its device structure is returned. Otherwise, %NULL is returned. | |
d75763d2 RD |
288 | * A new search is initiated by passing %NULL as the @from argument. |
289 | * Otherwise if @from is not %NULL, searches continue from previous device | |
290 | * on the global list. | |
1da177e4 LT |
291 | */ |
292 | struct pci_dev * | |
293 | pci_find_device_reverse(unsigned int vendor, unsigned int device, const struct pci_dev *from) | |
294 | { | |
295 | struct list_head *n; | |
296 | struct pci_dev *dev; | |
297 | ||
298 | WARN_ON(in_interrupt()); | |
d71374da | 299 | down_read(&pci_bus_sem); |
1da177e4 LT |
300 | n = from ? from->global_list.prev : pci_devices.prev; |
301 | ||
302 | while (n && (n != &pci_devices)) { | |
303 | dev = pci_dev_g(n); | |
304 | if ((vendor == PCI_ANY_ID || dev->vendor == vendor) && | |
305 | (device == PCI_ANY_ID || dev->device == device)) | |
306 | goto exit; | |
307 | n = n->prev; | |
308 | } | |
309 | dev = NULL; | |
310 | exit: | |
d71374da | 311 | up_read(&pci_bus_sem); |
1da177e4 LT |
312 | return dev; |
313 | } | |
314 | ||
315 | /** | |
316 | * pci_get_class - begin or continue searching for a PCI device by class | |
317 | * @class: search for a PCI device with this class designation | |
318 | * @from: Previous PCI device found in search, or %NULL for new search. | |
319 | * | |
320 | * Iterates through the list of known PCI devices. If a PCI device is | |
321 | * found with a matching @class, the reference count to the device is | |
322 | * incremented and a pointer to its device structure is returned. | |
323 | * Otherwise, %NULL is returned. | |
d75763d2 | 324 | * A new search is initiated by passing %NULL as the @from argument. |
1da177e4 LT |
325 | * Otherwise if @from is not %NULL, searches continue from next device |
326 | * on the global list. The reference count for @from is always decremented | |
327 | * if it is not %NULL. | |
328 | */ | |
329 | struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from) | |
330 | { | |
331 | struct list_head *n; | |
332 | struct pci_dev *dev; | |
333 | ||
334 | WARN_ON(in_interrupt()); | |
d71374da | 335 | down_read(&pci_bus_sem); |
1da177e4 LT |
336 | n = from ? from->global_list.next : pci_devices.next; |
337 | ||
338 | while (n && (n != &pci_devices)) { | |
339 | dev = pci_dev_g(n); | |
340 | if (dev->class == class) | |
341 | goto exit; | |
342 | n = n->next; | |
343 | } | |
344 | dev = NULL; | |
345 | exit: | |
1da177e4 | 346 | dev = pci_dev_get(dev); |
d71374da | 347 | up_read(&pci_bus_sem); |
b89b7ea0 | 348 | pci_dev_put(from); |
1da177e4 LT |
349 | return dev; |
350 | } | |
351 | ||
352 | /** | |
353 | * pci_dev_present - Returns 1 if device matching the device list is present, 0 if not. | |
354 | * @ids: A pointer to a null terminated list of struct pci_device_id structures | |
355 | * that describe the type of PCI device the caller is trying to find. | |
356 | * | |
357 | * Obvious fact: You do not have a reference to any device that might be found | |
358 | * by this function, so if that device is removed from the system right after | |
359 | * this function is finished, the value will be stale. Use this function to | |
360 | * find devices that are usually built into a system, or for a general hint as | |
361 | * to if another device happens to be present at this specific moment in time. | |
362 | */ | |
363 | int pci_dev_present(const struct pci_device_id *ids) | |
364 | { | |
365 | struct pci_dev *dev; | |
366 | int found = 0; | |
367 | ||
368 | WARN_ON(in_interrupt()); | |
d71374da | 369 | down_read(&pci_bus_sem); |
1da177e4 LT |
370 | while (ids->vendor || ids->subvendor || ids->class_mask) { |
371 | list_for_each_entry(dev, &pci_devices, global_list) { | |
372 | if (pci_match_one_device(ids, dev)) { | |
373 | found = 1; | |
374 | goto exit; | |
375 | } | |
376 | } | |
377 | ids++; | |
378 | } | |
d71374da ZY |
379 | exit: |
380 | up_read(&pci_bus_sem); | |
1da177e4 LT |
381 | return found; |
382 | } | |
383 | EXPORT_SYMBOL(pci_dev_present); | |
384 | ||
385 | EXPORT_SYMBOL(pci_find_bus); | |
e07d01e0 | 386 | EXPORT_SYMBOL(pci_find_next_bus); |
1da177e4 LT |
387 | EXPORT_SYMBOL(pci_find_device); |
388 | EXPORT_SYMBOL(pci_find_device_reverse); | |
389 | EXPORT_SYMBOL(pci_find_slot); | |
390 | EXPORT_SYMBOL(pci_get_device); | |
391 | EXPORT_SYMBOL(pci_get_subsys); | |
392 | EXPORT_SYMBOL(pci_get_slot); | |
393 | EXPORT_SYMBOL(pci_get_class); |