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