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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/pci/bus.c | |
3 | * | |
4 | * From setup-res.c, by: | |
5 | * Dave Rusling (david.rusling@reo.mts.dec.com) | |
6 | * David Mosberger (davidm@cs.arizona.edu) | |
7 | * David Miller (davem@redhat.com) | |
8 | * Ivan Kokshaysky (ink@jurassic.park.msu.ru) | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/pci.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/ioport.h> | |
15 | #include <linux/proc_fs.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
1da177e4 LT |
17 | |
18 | #include "pci.h" | |
19 | ||
0efd5aab BH |
20 | void pci_add_resource_offset(struct list_head *resources, struct resource *res, |
21 | resource_size_t offset) | |
45ca9e97 | 22 | { |
14d76b68 | 23 | struct resource_entry *entry; |
45ca9e97 | 24 | |
14d76b68 JL |
25 | entry = resource_list_create_entry(res, 0); |
26 | if (!entry) { | |
0efd5aab | 27 | printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res); |
45ca9e97 BH |
28 | return; |
29 | } | |
30 | ||
14d76b68 JL |
31 | entry->offset = offset; |
32 | resource_list_add_tail(entry, resources); | |
0efd5aab BH |
33 | } |
34 | EXPORT_SYMBOL(pci_add_resource_offset); | |
35 | ||
36 | void pci_add_resource(struct list_head *resources, struct resource *res) | |
37 | { | |
38 | pci_add_resource_offset(resources, res, 0); | |
45ca9e97 BH |
39 | } |
40 | EXPORT_SYMBOL(pci_add_resource); | |
41 | ||
42 | void pci_free_resource_list(struct list_head *resources) | |
43 | { | |
14d76b68 | 44 | resource_list_free(resources); |
45ca9e97 BH |
45 | } |
46 | EXPORT_SYMBOL(pci_free_resource_list); | |
47 | ||
2fe2abf8 BH |
48 | void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, |
49 | unsigned int flags) | |
50 | { | |
51 | struct pci_bus_resource *bus_res; | |
52 | ||
53 | bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL); | |
54 | if (!bus_res) { | |
55 | dev_err(&bus->dev, "can't add %pR resource\n", res); | |
56 | return; | |
57 | } | |
58 | ||
59 | bus_res->res = res; | |
60 | bus_res->flags = flags; | |
61 | list_add_tail(&bus_res->list, &bus->resources); | |
62 | } | |
63 | ||
64 | struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n) | |
65 | { | |
66 | struct pci_bus_resource *bus_res; | |
67 | ||
68 | if (n < PCI_BRIDGE_RESOURCE_NUM) | |
69 | return bus->resource[n]; | |
70 | ||
71 | n -= PCI_BRIDGE_RESOURCE_NUM; | |
72 | list_for_each_entry(bus_res, &bus->resources, list) { | |
73 | if (n-- == 0) | |
74 | return bus_res->res; | |
75 | } | |
76 | return NULL; | |
77 | } | |
78 | EXPORT_SYMBOL_GPL(pci_bus_resource_n); | |
79 | ||
80 | void pci_bus_remove_resources(struct pci_bus *bus) | |
81 | { | |
2fe2abf8 | 82 | int i; |
817a2685 | 83 | struct pci_bus_resource *bus_res, *tmp; |
2fe2abf8 BH |
84 | |
85 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) | |
7736a05a | 86 | bus->resource[i] = NULL; |
2fe2abf8 | 87 | |
817a2685 YL |
88 | list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) { |
89 | list_del(&bus_res->list); | |
90 | kfree(bus_res); | |
91 | } | |
2fe2abf8 BH |
92 | } |
93 | ||
f75b99d5 | 94 | static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL}; |
3a9ad0b4 | 95 | #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT |
f75b99d5 | 96 | static struct pci_bus_region pci_64_bit = {0, |
3a9ad0b4 YL |
97 | (pci_bus_addr_t) 0xffffffffffffffffULL}; |
98 | static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL, | |
99 | (pci_bus_addr_t) 0xffffffffffffffffULL}; | |
f75b99d5 YL |
100 | #endif |
101 | ||
102 | /* | |
103 | * @res contains CPU addresses. Clip it so the corresponding bus addresses | |
104 | * on @bus are entirely within @region. This is used to control the bus | |
105 | * addresses of resources we allocate, e.g., we may need a resource that | |
106 | * can be mapped by a 32-bit BAR. | |
1da177e4 | 107 | */ |
f75b99d5 YL |
108 | static void pci_clip_resource_to_region(struct pci_bus *bus, |
109 | struct resource *res, | |
110 | struct pci_bus_region *region) | |
111 | { | |
112 | struct pci_bus_region r; | |
113 | ||
114 | pcibios_resource_to_bus(bus, &r, res); | |
115 | if (r.start < region->start) | |
116 | r.start = region->start; | |
117 | if (r.end > region->end) | |
118 | r.end = region->end; | |
119 | ||
120 | if (r.end < r.start) | |
121 | res->end = res->start - 1; | |
122 | else | |
123 | pcibios_bus_to_resource(bus, res, &r); | |
124 | } | |
125 | ||
126 | static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res, | |
e31dd6e4 | 127 | resource_size_t size, resource_size_t align, |
664c2848 | 128 | resource_size_t min, unsigned long type_mask, |
b26b2d49 | 129 | resource_size_t (*alignf)(void *, |
3b7a17fc | 130 | const struct resource *, |
b26b2d49 DB |
131 | resource_size_t, |
132 | resource_size_t), | |
f75b99d5 YL |
133 | void *alignf_data, |
134 | struct pci_bus_region *region) | |
1da177e4 | 135 | { |
f75b99d5 YL |
136 | int i, ret; |
137 | struct resource *r, avail; | |
138 | resource_size_t max; | |
1da177e4 | 139 | |
aa11fc58 | 140 | type_mask |= IORESOURCE_TYPE_BITS; |
1da177e4 | 141 | |
6db45b76 | 142 | pci_bus_for_each_resource(bus, r, i) { |
3460baa6 CB |
143 | resource_size_t min_used = min; |
144 | ||
6db45b76 BH |
145 | if (!r) |
146 | continue; | |
147 | ||
1da177e4 LT |
148 | /* type_mask must match */ |
149 | if ((res->flags ^ r->flags) & type_mask) | |
150 | continue; | |
151 | ||
152 | /* We cannot allocate a non-prefetching resource | |
153 | from a pre-fetching area */ | |
154 | if ((r->flags & IORESOURCE_PREFETCH) && | |
155 | !(res->flags & IORESOURCE_PREFETCH)) | |
156 | continue; | |
157 | ||
f75b99d5 YL |
158 | avail = *r; |
159 | pci_clip_resource_to_region(bus, &avail, region); | |
f75b99d5 | 160 | |
36e097a8 BH |
161 | /* |
162 | * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to | |
163 | * protect badly documented motherboard resources, but if | |
164 | * this is an already-configured bridge window, its start | |
165 | * overrides "min". | |
166 | */ | |
f75b99d5 | 167 | if (avail.start) |
3460baa6 | 168 | min_used = avail.start; |
f75b99d5 YL |
169 | |
170 | max = avail.end; | |
36e097a8 | 171 | |
1da177e4 | 172 | /* Ok, try it out.. */ |
3460baa6 | 173 | ret = allocate_resource(r, res, size, min_used, max, |
36e097a8 | 174 | align, alignf, alignf_data); |
1da177e4 | 175 | if (ret == 0) |
f75b99d5 | 176 | return 0; |
1da177e4 | 177 | } |
f75b99d5 YL |
178 | return -ENOMEM; |
179 | } | |
180 | ||
181 | /** | |
182 | * pci_bus_alloc_resource - allocate a resource from a parent bus | |
183 | * @bus: PCI bus | |
184 | * @res: resource to allocate | |
185 | * @size: size of resource to allocate | |
186 | * @align: alignment of resource to allocate | |
187 | * @min: minimum /proc/iomem address to allocate | |
188 | * @type_mask: IORESOURCE_* type flags | |
189 | * @alignf: resource alignment function | |
190 | * @alignf_data: data argument for resource alignment function | |
191 | * | |
192 | * Given the PCI bus a device resides on, the size, minimum address, | |
193 | * alignment and type, try to find an acceptable resource allocation | |
194 | * for a specific device resource. | |
195 | */ | |
d56dbf5b | 196 | int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, |
f75b99d5 | 197 | resource_size_t size, resource_size_t align, |
664c2848 | 198 | resource_size_t min, unsigned long type_mask, |
f75b99d5 YL |
199 | resource_size_t (*alignf)(void *, |
200 | const struct resource *, | |
201 | resource_size_t, | |
202 | resource_size_t), | |
203 | void *alignf_data) | |
204 | { | |
3a9ad0b4 | 205 | #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT |
d56dbf5b YL |
206 | int rc; |
207 | ||
208 | if (res->flags & IORESOURCE_MEM_64) { | |
209 | rc = pci_bus_alloc_from_region(bus, res, size, align, min, | |
210 | type_mask, alignf, alignf_data, | |
211 | &pci_high); | |
212 | if (rc == 0) | |
213 | return 0; | |
214 | ||
f75b99d5 YL |
215 | return pci_bus_alloc_from_region(bus, res, size, align, min, |
216 | type_mask, alignf, alignf_data, | |
217 | &pci_64_bit); | |
1da177e4 | 218 | } |
f75b99d5 YL |
219 | #endif |
220 | ||
221 | return pci_bus_alloc_from_region(bus, res, size, align, min, | |
222 | type_mask, alignf, alignf_data, | |
223 | &pci_32_bit); | |
1da177e4 | 224 | } |
b7fe9434 | 225 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
1da177e4 | 226 | |
0f7e7aee YL |
227 | /* |
228 | * The @idx resource of @dev should be a PCI-PCI bridge window. If this | |
229 | * resource fits inside a window of an upstream bridge, do nothing. If it | |
230 | * overlaps an upstream window but extends outside it, clip the resource so | |
231 | * it fits completely inside. | |
232 | */ | |
233 | bool pci_bus_clip_resource(struct pci_dev *dev, int idx) | |
234 | { | |
235 | struct pci_bus *bus = dev->bus; | |
236 | struct resource *res = &dev->resource[idx]; | |
237 | struct resource orig_res = *res; | |
238 | struct resource *r; | |
239 | int i; | |
240 | ||
241 | pci_bus_for_each_resource(bus, r, i) { | |
242 | resource_size_t start, end; | |
243 | ||
244 | if (!r) | |
245 | continue; | |
246 | ||
247 | if (resource_type(res) != resource_type(r)) | |
248 | continue; | |
249 | ||
250 | start = max(r->start, res->start); | |
251 | end = min(r->end, res->end); | |
252 | ||
253 | if (start > end) | |
254 | continue; /* no overlap */ | |
255 | ||
256 | if (res->start == start && res->end == end) | |
257 | return false; /* no change */ | |
258 | ||
259 | res->start = start; | |
260 | res->end = end; | |
b838b39e BH |
261 | res->flags &= ~IORESOURCE_UNSET; |
262 | orig_res.flags &= ~IORESOURCE_UNSET; | |
0f7e7aee YL |
263 | dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n", |
264 | &orig_res, res); | |
265 | ||
266 | return true; | |
267 | } | |
268 | ||
269 | return false; | |
270 | } | |
271 | ||
3c449ed0 YL |
272 | void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { } |
273 | ||
7b77061f WY |
274 | void __weak pcibios_bus_add_device(struct pci_dev *pdev) { } |
275 | ||
1da177e4 | 276 | /** |
4f535093 | 277 | * pci_bus_add_device - start driver for a single device |
1da177e4 LT |
278 | * @dev: device to add |
279 | * | |
4f535093 | 280 | * This adds add sysfs entries and start device drivers |
1da177e4 | 281 | */ |
c893d133 | 282 | void pci_bus_add_device(struct pci_dev *dev) |
1da177e4 | 283 | { |
b19441af | 284 | int retval; |
735bff10 | 285 | |
4f535093 YL |
286 | /* |
287 | * Can not put in pci_device_add yet because resources | |
288 | * are not assigned yet for some devices. | |
289 | */ | |
7b77061f | 290 | pcibios_bus_add_device(dev); |
e253aaf0 | 291 | pci_fixup_device(pci_fixup_final, dev); |
4f535093 | 292 | pci_create_sysfs_dev_files(dev); |
ef37702e | 293 | pci_proc_attach_device(dev); |
1da177e4 | 294 | |
58d9a38f YL |
295 | dev->match_driver = true; |
296 | retval = device_attach(&dev->dev); | |
9a2a5a63 | 297 | if (retval < 0 && retval != -EPROBE_DEFER) { |
ab1a187b BH |
298 | dev_warn(&dev->dev, "device attach failed (%d)\n", retval); |
299 | pci_proc_detach_device(dev); | |
300 | pci_remove_sysfs_dev_files(dev); | |
301 | return; | |
302 | } | |
58d9a38f | 303 | |
8a1bc901 | 304 | dev->is_added = 1; |
876e501a | 305 | } |
b7fe9434 | 306 | EXPORT_SYMBOL_GPL(pci_bus_add_device); |
876e501a | 307 | |
1da177e4 | 308 | /** |
4f535093 | 309 | * pci_bus_add_devices - start driver for PCI devices |
1da177e4 LT |
310 | * @bus: bus to check for new devices |
311 | * | |
4f535093 | 312 | * Start driver for PCI devices and add some sysfs entries. |
1da177e4 | 313 | */ |
c48f1670 | 314 | void pci_bus_add_devices(const struct pci_bus *bus) |
1da177e4 LT |
315 | { |
316 | struct pci_dev *dev; | |
3fa16fdb | 317 | struct pci_bus *child; |
1da177e4 LT |
318 | |
319 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 GKH |
320 | /* Skip already-added devices */ |
321 | if (dev->is_added) | |
1da177e4 | 322 | continue; |
c893d133 | 323 | pci_bus_add_device(dev); |
1da177e4 LT |
324 | } |
325 | ||
326 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1e398eae LW |
327 | /* Skip if device attach failed */ |
328 | if (!dev->is_added) | |
329 | continue; | |
3fa16fdb | 330 | child = dev->subordinate; |
981cf9ea JL |
331 | if (child) |
332 | pci_bus_add_devices(child); | |
1da177e4 LT |
333 | } |
334 | } | |
b7fe9434 | 335 | EXPORT_SYMBOL(pci_bus_add_devices); |
1da177e4 | 336 | |
cecf4864 PM |
337 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
338 | * @top bus whose devices should be walked | |
339 | * @cb callback to be called for each device found | |
340 | * @userdata arbitrary pointer to be passed to callback. | |
341 | * | |
342 | * Walk the given bus, including any bridged devices | |
343 | * on buses under this bus. Call the provided callback | |
344 | * on each device found. | |
70298c6e ZY |
345 | * |
346 | * We check the return of @cb each time. If it returns anything | |
347 | * other than 0, we break out. | |
348 | * | |
cecf4864 | 349 | */ |
70298c6e | 350 | void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), |
cecf4864 PM |
351 | void *userdata) |
352 | { | |
353 | struct pci_dev *dev; | |
354 | struct pci_bus *bus; | |
355 | struct list_head *next; | |
70298c6e | 356 | int retval; |
cecf4864 PM |
357 | |
358 | bus = top; | |
d71374da | 359 | down_read(&pci_bus_sem); |
cecf4864 PM |
360 | next = top->devices.next; |
361 | for (;;) { | |
362 | if (next == &bus->devices) { | |
363 | /* end of this bus, go up or finish */ | |
364 | if (bus == top) | |
365 | break; | |
366 | next = bus->self->bus_list.next; | |
367 | bus = bus->self->bus; | |
368 | continue; | |
369 | } | |
370 | dev = list_entry(next, struct pci_dev, bus_list); | |
cecf4864 PM |
371 | if (dev->subordinate) { |
372 | /* this is a pci-pci bridge, do its devices next */ | |
373 | next = dev->subordinate->devices.next; | |
374 | bus = dev->subordinate; | |
375 | } else | |
376 | next = dev->bus_list.next; | |
cecf4864 | 377 | |
70298c6e | 378 | retval = cb(dev, userdata); |
70298c6e ZY |
379 | if (retval) |
380 | break; | |
cecf4864 | 381 | } |
d71374da | 382 | up_read(&pci_bus_sem); |
cecf4864 | 383 | } |
7c94def8 | 384 | EXPORT_SYMBOL_GPL(pci_walk_bus); |
cecf4864 | 385 | |
fe830ef6 JL |
386 | struct pci_bus *pci_bus_get(struct pci_bus *bus) |
387 | { | |
388 | if (bus) | |
389 | get_device(&bus->dev); | |
390 | return bus; | |
391 | } | |
392 | EXPORT_SYMBOL(pci_bus_get); | |
393 | ||
394 | void pci_bus_put(struct pci_bus *bus) | |
395 | { | |
396 | if (bus) | |
397 | put_device(&bus->dev); | |
398 | } | |
399 | EXPORT_SYMBOL(pci_bus_put); | |
400 |