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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/pci/setup-bus.c | |
3 | * | |
4 | * Extruded from code written by | |
5 | * Dave Rusling (david.rusling@reo.mts.dec.com) | |
6 | * David Mosberger (davidm@cs.arizona.edu) | |
7 | * David Miller (davem@redhat.com) | |
8 | * | |
9 | * Support routines for initializing a PCI subsystem. | |
10 | */ | |
11 | ||
12 | /* | |
13 | * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru> | |
14 | * PCI-PCI bridges cleanup, sorted resource allocation. | |
15 | * Feb 2002, Ivan Kokshaysky <ink@jurassic.park.msu.ru> | |
16 | * Converted to allocation in 3 passes, which gives | |
17 | * tighter packing. Prefetchable range support. | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/pci.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/cache.h> | |
27 | #include <linux/slab.h> | |
47087700 | 28 | #include <asm-generic/pci-bridge.h> |
6faf17f6 | 29 | #include "pci.h" |
1da177e4 | 30 | |
844393f4 | 31 | unsigned int pci_flags; |
47087700 | 32 | |
bdc4abec YL |
33 | struct pci_dev_resource { |
34 | struct list_head list; | |
2934a0de YL |
35 | struct resource *res; |
36 | struct pci_dev *dev; | |
568ddef8 YL |
37 | resource_size_t start; |
38 | resource_size_t end; | |
c8adf9a3 | 39 | resource_size_t add_size; |
2bbc6942 | 40 | resource_size_t min_align; |
568ddef8 YL |
41 | unsigned long flags; |
42 | }; | |
43 | ||
bffc56d4 YL |
44 | static void free_list(struct list_head *head) |
45 | { | |
46 | struct pci_dev_resource *dev_res, *tmp; | |
47 | ||
48 | list_for_each_entry_safe(dev_res, tmp, head, list) { | |
49 | list_del(&dev_res->list); | |
50 | kfree(dev_res); | |
51 | } | |
52 | } | |
094732a5 | 53 | |
c8adf9a3 RP |
54 | /** |
55 | * add_to_list() - add a new resource tracker to the list | |
56 | * @head: Head of the list | |
57 | * @dev: device corresponding to which the resource | |
58 | * belongs | |
59 | * @res: The resource to be tracked | |
60 | * @add_size: additional size to be optionally added | |
61 | * to the resource | |
62 | */ | |
bdc4abec | 63 | static int add_to_list(struct list_head *head, |
c8adf9a3 | 64 | struct pci_dev *dev, struct resource *res, |
2bbc6942 | 65 | resource_size_t add_size, resource_size_t min_align) |
568ddef8 | 66 | { |
764242a0 | 67 | struct pci_dev_resource *tmp; |
568ddef8 | 68 | |
bdc4abec | 69 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); |
568ddef8 | 70 | if (!tmp) { |
c8adf9a3 | 71 | pr_warning("add_to_list: kmalloc() failed!\n"); |
ef62dfef | 72 | return -ENOMEM; |
568ddef8 YL |
73 | } |
74 | ||
568ddef8 YL |
75 | tmp->res = res; |
76 | tmp->dev = dev; | |
77 | tmp->start = res->start; | |
78 | tmp->end = res->end; | |
79 | tmp->flags = res->flags; | |
c8adf9a3 | 80 | tmp->add_size = add_size; |
2bbc6942 | 81 | tmp->min_align = min_align; |
bdc4abec YL |
82 | |
83 | list_add(&tmp->list, head); | |
ef62dfef YL |
84 | |
85 | return 0; | |
568ddef8 YL |
86 | } |
87 | ||
b9b0bba9 | 88 | static void remove_from_list(struct list_head *head, |
3e6e0d80 YL |
89 | struct resource *res) |
90 | { | |
b9b0bba9 | 91 | struct pci_dev_resource *dev_res, *tmp; |
3e6e0d80 | 92 | |
b9b0bba9 YL |
93 | list_for_each_entry_safe(dev_res, tmp, head, list) { |
94 | if (dev_res->res == res) { | |
95 | list_del(&dev_res->list); | |
96 | kfree(dev_res); | |
bdc4abec | 97 | break; |
3e6e0d80 | 98 | } |
3e6e0d80 YL |
99 | } |
100 | } | |
101 | ||
b9b0bba9 | 102 | static resource_size_t get_res_add_size(struct list_head *head, |
1c372353 YL |
103 | struct resource *res) |
104 | { | |
b9b0bba9 | 105 | struct pci_dev_resource *dev_res; |
bdc4abec | 106 | |
b9b0bba9 YL |
107 | list_for_each_entry(dev_res, head, list) { |
108 | if (dev_res->res == res) { | |
b592443d YL |
109 | int idx = res - &dev_res->dev->resource[0]; |
110 | ||
b9b0bba9 | 111 | dev_printk(KERN_DEBUG, &dev_res->dev->dev, |
b592443d YL |
112 | "res[%d]=%pR get_res_add_size add_size %llx\n", |
113 | idx, dev_res->res, | |
b9b0bba9 | 114 | (unsigned long long)dev_res->add_size); |
b592443d | 115 | |
b9b0bba9 | 116 | return dev_res->add_size; |
bdc4abec | 117 | } |
3e6e0d80 | 118 | } |
1c372353 YL |
119 | |
120 | return 0; | |
121 | } | |
122 | ||
78c3b329 | 123 | /* Sort resources by alignment */ |
bdc4abec | 124 | static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head) |
78c3b329 YL |
125 | { |
126 | int i; | |
127 | ||
128 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
129 | struct resource *r; | |
bdc4abec | 130 | struct pci_dev_resource *dev_res, *tmp; |
78c3b329 | 131 | resource_size_t r_align; |
bdc4abec | 132 | struct list_head *n; |
78c3b329 YL |
133 | |
134 | r = &dev->resource[i]; | |
135 | ||
136 | if (r->flags & IORESOURCE_PCI_FIXED) | |
137 | continue; | |
138 | ||
139 | if (!(r->flags) || r->parent) | |
140 | continue; | |
141 | ||
142 | r_align = pci_resource_alignment(dev, r); | |
143 | if (!r_align) { | |
144 | dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n", | |
145 | i, r); | |
146 | continue; | |
147 | } | |
78c3b329 | 148 | |
bdc4abec YL |
149 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); |
150 | if (!tmp) | |
151 | panic("pdev_sort_resources(): " | |
152 | "kmalloc() failed!\n"); | |
153 | tmp->res = r; | |
154 | tmp->dev = dev; | |
155 | ||
156 | /* fallback is smallest one or list is empty*/ | |
157 | n = head; | |
158 | list_for_each_entry(dev_res, head, list) { | |
159 | resource_size_t align; | |
160 | ||
161 | align = pci_resource_alignment(dev_res->dev, | |
162 | dev_res->res); | |
78c3b329 YL |
163 | |
164 | if (r_align > align) { | |
bdc4abec | 165 | n = &dev_res->list; |
78c3b329 YL |
166 | break; |
167 | } | |
168 | } | |
bdc4abec YL |
169 | /* Insert it just before n*/ |
170 | list_add_tail(&tmp->list, n); | |
78c3b329 YL |
171 | } |
172 | } | |
173 | ||
6841ec68 | 174 | static void __dev_sort_resources(struct pci_dev *dev, |
bdc4abec | 175 | struct list_head *head) |
1da177e4 | 176 | { |
6841ec68 | 177 | u16 class = dev->class >> 8; |
1da177e4 | 178 | |
6841ec68 YL |
179 | /* Don't touch classless devices or host bridges or ioapics. */ |
180 | if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST) | |
181 | return; | |
1da177e4 | 182 | |
6841ec68 YL |
183 | /* Don't touch ioapic devices already enabled by firmware */ |
184 | if (class == PCI_CLASS_SYSTEM_PIC) { | |
185 | u16 command; | |
186 | pci_read_config_word(dev, PCI_COMMAND, &command); | |
187 | if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | |
188 | return; | |
189 | } | |
1da177e4 | 190 | |
6841ec68 YL |
191 | pdev_sort_resources(dev, head); |
192 | } | |
23186279 | 193 | |
fc075e1d RP |
194 | static inline void reset_resource(struct resource *res) |
195 | { | |
196 | res->start = 0; | |
197 | res->end = 0; | |
198 | res->flags = 0; | |
199 | } | |
200 | ||
c8adf9a3 | 201 | /** |
9e8bf93a | 202 | * reassign_resources_sorted() - satisfy any additional resource requests |
c8adf9a3 | 203 | * |
9e8bf93a | 204 | * @realloc_head : head of the list tracking requests requiring additional |
c8adf9a3 RP |
205 | * resources |
206 | * @head : head of the list tracking requests with allocated | |
207 | * resources | |
208 | * | |
9e8bf93a | 209 | * Walk through each element of the realloc_head and try to procure |
c8adf9a3 RP |
210 | * additional resources for the element, provided the element |
211 | * is in the head list. | |
212 | */ | |
bdc4abec YL |
213 | static void reassign_resources_sorted(struct list_head *realloc_head, |
214 | struct list_head *head) | |
6841ec68 YL |
215 | { |
216 | struct resource *res; | |
b9b0bba9 | 217 | struct pci_dev_resource *add_res, *tmp; |
bdc4abec | 218 | struct pci_dev_resource *dev_res; |
c8adf9a3 | 219 | resource_size_t add_size; |
6841ec68 | 220 | int idx; |
1da177e4 | 221 | |
b9b0bba9 | 222 | list_for_each_entry_safe(add_res, tmp, realloc_head, list) { |
bdc4abec YL |
223 | bool found_match = false; |
224 | ||
b9b0bba9 | 225 | res = add_res->res; |
c8adf9a3 RP |
226 | /* skip resource that has been reset */ |
227 | if (!res->flags) | |
228 | goto out; | |
229 | ||
230 | /* skip this resource if not found in head list */ | |
bdc4abec YL |
231 | list_for_each_entry(dev_res, head, list) { |
232 | if (dev_res->res == res) { | |
233 | found_match = true; | |
234 | break; | |
235 | } | |
c8adf9a3 | 236 | } |
bdc4abec YL |
237 | if (!found_match)/* just skip */ |
238 | continue; | |
c8adf9a3 | 239 | |
b9b0bba9 YL |
240 | idx = res - &add_res->dev->resource[0]; |
241 | add_size = add_res->add_size; | |
2bbc6942 | 242 | if (!resource_size(res)) { |
b9b0bba9 | 243 | res->start = add_res->start; |
2bbc6942 | 244 | res->end = res->start + add_size - 1; |
b9b0bba9 | 245 | if (pci_assign_resource(add_res->dev, idx)) |
c8adf9a3 | 246 | reset_resource(res); |
2bbc6942 | 247 | } else { |
b9b0bba9 YL |
248 | resource_size_t align = add_res->min_align; |
249 | res->flags |= add_res->flags & | |
bdc4abec | 250 | (IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN); |
b9b0bba9 | 251 | if (pci_reassign_resource(add_res->dev, idx, |
bdc4abec | 252 | add_size, align)) |
b9b0bba9 | 253 | dev_printk(KERN_DEBUG, &add_res->dev->dev, |
b592443d YL |
254 | "failed to add %llx res[%d]=%pR\n", |
255 | (unsigned long long)add_size, | |
256 | idx, res); | |
c8adf9a3 RP |
257 | } |
258 | out: | |
b9b0bba9 YL |
259 | list_del(&add_res->list); |
260 | kfree(add_res); | |
c8adf9a3 RP |
261 | } |
262 | } | |
263 | ||
264 | /** | |
265 | * assign_requested_resources_sorted() - satisfy resource requests | |
266 | * | |
267 | * @head : head of the list tracking requests for resources | |
8356aad4 | 268 | * @fail_head : head of the list tracking requests that could |
c8adf9a3 RP |
269 | * not be allocated |
270 | * | |
271 | * Satisfy resource requests of each element in the list. Add | |
272 | * requests that could not satisfied to the failed_list. | |
273 | */ | |
bdc4abec YL |
274 | static void assign_requested_resources_sorted(struct list_head *head, |
275 | struct list_head *fail_head) | |
c8adf9a3 RP |
276 | { |
277 | struct resource *res; | |
bdc4abec | 278 | struct pci_dev_resource *dev_res; |
c8adf9a3 | 279 | int idx; |
9a928660 | 280 | |
bdc4abec YL |
281 | list_for_each_entry(dev_res, head, list) { |
282 | res = dev_res->res; | |
283 | idx = res - &dev_res->dev->resource[0]; | |
284 | if (resource_size(res) && | |
285 | pci_assign_resource(dev_res->dev, idx)) { | |
286 | if (fail_head && !pci_is_root_bus(dev_res->dev->bus)) { | |
9a928660 YL |
287 | /* |
288 | * if the failed res is for ROM BAR, and it will | |
289 | * be enabled later, don't add it to the list | |
290 | */ | |
291 | if (!((idx == PCI_ROM_RESOURCE) && | |
292 | (!(res->flags & IORESOURCE_ROM_ENABLE)))) | |
67cc7e26 YL |
293 | add_to_list(fail_head, |
294 | dev_res->dev, res, | |
295 | 0 /* dont care */, | |
296 | 0 /* dont care */); | |
9a928660 | 297 | } |
fc075e1d | 298 | reset_resource(res); |
542df5de | 299 | } |
1da177e4 LT |
300 | } |
301 | } | |
302 | ||
bdc4abec YL |
303 | static void __assign_resources_sorted(struct list_head *head, |
304 | struct list_head *realloc_head, | |
305 | struct list_head *fail_head) | |
c8adf9a3 | 306 | { |
3e6e0d80 YL |
307 | /* |
308 | * Should not assign requested resources at first. | |
309 | * they could be adjacent, so later reassign can not reallocate | |
310 | * them one by one in parent resource window. | |
367fa982 | 311 | * Try to assign requested + add_size at beginning |
3e6e0d80 YL |
312 | * if could do that, could get out early. |
313 | * if could not do that, we still try to assign requested at first, | |
314 | * then try to reassign add_size for some resources. | |
315 | */ | |
bdc4abec YL |
316 | LIST_HEAD(save_head); |
317 | LIST_HEAD(local_fail_head); | |
b9b0bba9 | 318 | struct pci_dev_resource *save_res; |
bdc4abec | 319 | struct pci_dev_resource *dev_res; |
3e6e0d80 YL |
320 | |
321 | /* Check if optional add_size is there */ | |
bdc4abec | 322 | if (!realloc_head || list_empty(realloc_head)) |
3e6e0d80 YL |
323 | goto requested_and_reassign; |
324 | ||
325 | /* Save original start, end, flags etc at first */ | |
bdc4abec YL |
326 | list_for_each_entry(dev_res, head, list) { |
327 | if (add_to_list(&save_head, dev_res->dev, dev_res->res, 0, 0)) { | |
bffc56d4 | 328 | free_list(&save_head); |
3e6e0d80 YL |
329 | goto requested_and_reassign; |
330 | } | |
bdc4abec | 331 | } |
3e6e0d80 YL |
332 | |
333 | /* Update res in head list with add_size in realloc_head list */ | |
bdc4abec YL |
334 | list_for_each_entry(dev_res, head, list) |
335 | dev_res->res->end += get_res_add_size(realloc_head, | |
336 | dev_res->res); | |
3e6e0d80 YL |
337 | |
338 | /* Try updated head list with add_size added */ | |
3e6e0d80 YL |
339 | assign_requested_resources_sorted(head, &local_fail_head); |
340 | ||
341 | /* all assigned with add_size ? */ | |
bdc4abec | 342 | if (list_empty(&local_fail_head)) { |
3e6e0d80 | 343 | /* Remove head list from realloc_head list */ |
bdc4abec YL |
344 | list_for_each_entry(dev_res, head, list) |
345 | remove_from_list(realloc_head, dev_res->res); | |
bffc56d4 YL |
346 | free_list(&save_head); |
347 | free_list(head); | |
3e6e0d80 YL |
348 | return; |
349 | } | |
350 | ||
bffc56d4 | 351 | free_list(&local_fail_head); |
3e6e0d80 | 352 | /* Release assigned resource */ |
bdc4abec YL |
353 | list_for_each_entry(dev_res, head, list) |
354 | if (dev_res->res->parent) | |
355 | release_resource(dev_res->res); | |
3e6e0d80 | 356 | /* Restore start/end/flags from saved list */ |
b9b0bba9 YL |
357 | list_for_each_entry(save_res, &save_head, list) { |
358 | struct resource *res = save_res->res; | |
3e6e0d80 | 359 | |
b9b0bba9 YL |
360 | res->start = save_res->start; |
361 | res->end = save_res->end; | |
362 | res->flags = save_res->flags; | |
3e6e0d80 | 363 | } |
bffc56d4 | 364 | free_list(&save_head); |
3e6e0d80 YL |
365 | |
366 | requested_and_reassign: | |
c8adf9a3 RP |
367 | /* Satisfy the must-have resource requests */ |
368 | assign_requested_resources_sorted(head, fail_head); | |
369 | ||
0a2daa1c | 370 | /* Try to satisfy any additional optional resource |
c8adf9a3 | 371 | requests */ |
9e8bf93a RP |
372 | if (realloc_head) |
373 | reassign_resources_sorted(realloc_head, head); | |
bffc56d4 | 374 | free_list(head); |
c8adf9a3 RP |
375 | } |
376 | ||
6841ec68 | 377 | static void pdev_assign_resources_sorted(struct pci_dev *dev, |
bdc4abec YL |
378 | struct list_head *add_head, |
379 | struct list_head *fail_head) | |
6841ec68 | 380 | { |
bdc4abec | 381 | LIST_HEAD(head); |
6841ec68 | 382 | |
6841ec68 | 383 | __dev_sort_resources(dev, &head); |
8424d759 | 384 | __assign_resources_sorted(&head, add_head, fail_head); |
6841ec68 YL |
385 | |
386 | } | |
387 | ||
388 | static void pbus_assign_resources_sorted(const struct pci_bus *bus, | |
bdc4abec YL |
389 | struct list_head *realloc_head, |
390 | struct list_head *fail_head) | |
6841ec68 YL |
391 | { |
392 | struct pci_dev *dev; | |
bdc4abec | 393 | LIST_HEAD(head); |
6841ec68 | 394 | |
6841ec68 YL |
395 | list_for_each_entry(dev, &bus->devices, bus_list) |
396 | __dev_sort_resources(dev, &head); | |
397 | ||
9e8bf93a | 398 | __assign_resources_sorted(&head, realloc_head, fail_head); |
6841ec68 YL |
399 | } |
400 | ||
b3743fa4 | 401 | void pci_setup_cardbus(struct pci_bus *bus) |
1da177e4 LT |
402 | { |
403 | struct pci_dev *bridge = bus->self; | |
c7dabef8 | 404 | struct resource *res; |
1da177e4 LT |
405 | struct pci_bus_region region; |
406 | ||
b918c62e YL |
407 | dev_info(&bridge->dev, "CardBus bridge to %pR\n", |
408 | &bus->busn_res); | |
1da177e4 | 409 | |
c7dabef8 BH |
410 | res = bus->resource[0]; |
411 | pcibios_resource_to_bus(bridge, ®ion, res); | |
412 | if (res->flags & IORESOURCE_IO) { | |
1da177e4 LT |
413 | /* |
414 | * The IO resource is allocated a range twice as large as it | |
415 | * would normally need. This allows us to set both IO regs. | |
416 | */ | |
c7dabef8 | 417 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
1da177e4 LT |
418 | pci_write_config_dword(bridge, PCI_CB_IO_BASE_0, |
419 | region.start); | |
420 | pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0, | |
421 | region.end); | |
422 | } | |
423 | ||
c7dabef8 BH |
424 | res = bus->resource[1]; |
425 | pcibios_resource_to_bus(bridge, ®ion, res); | |
426 | if (res->flags & IORESOURCE_IO) { | |
427 | dev_info(&bridge->dev, " bridge window %pR\n", res); | |
1da177e4 LT |
428 | pci_write_config_dword(bridge, PCI_CB_IO_BASE_1, |
429 | region.start); | |
430 | pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1, | |
431 | region.end); | |
432 | } | |
433 | ||
c7dabef8 BH |
434 | res = bus->resource[2]; |
435 | pcibios_resource_to_bus(bridge, ®ion, res); | |
436 | if (res->flags & IORESOURCE_MEM) { | |
437 | dev_info(&bridge->dev, " bridge window %pR\n", res); | |
1da177e4 LT |
438 | pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0, |
439 | region.start); | |
440 | pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0, | |
441 | region.end); | |
442 | } | |
443 | ||
c7dabef8 BH |
444 | res = bus->resource[3]; |
445 | pcibios_resource_to_bus(bridge, ®ion, res); | |
446 | if (res->flags & IORESOURCE_MEM) { | |
447 | dev_info(&bridge->dev, " bridge window %pR\n", res); | |
1da177e4 LT |
448 | pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1, |
449 | region.start); | |
450 | pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1, | |
451 | region.end); | |
452 | } | |
453 | } | |
b3743fa4 | 454 | EXPORT_SYMBOL(pci_setup_cardbus); |
1da177e4 LT |
455 | |
456 | /* Initialize bridges with base/limit values we have collected. | |
457 | PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998) | |
458 | requires that if there is no I/O ports or memory behind the | |
459 | bridge, corresponding range must be turned off by writing base | |
460 | value greater than limit to the bridge's base/limit registers. | |
461 | ||
462 | Note: care must be taken when updating I/O base/limit registers | |
463 | of bridges which support 32-bit I/O. This update requires two | |
464 | config space writes, so it's quite possible that an I/O window of | |
465 | the bridge will have some undesirable address (e.g. 0) after the | |
466 | first write. Ditto 64-bit prefetchable MMIO. */ | |
7cc5997d | 467 | static void pci_setup_bridge_io(struct pci_bus *bus) |
1da177e4 LT |
468 | { |
469 | struct pci_dev *bridge = bus->self; | |
c7dabef8 | 470 | struct resource *res; |
1da177e4 | 471 | struct pci_bus_region region; |
2b28ae19 BH |
472 | unsigned long io_mask; |
473 | u8 io_base_lo, io_limit_lo; | |
7cc5997d | 474 | u32 l, io_upper16; |
1da177e4 | 475 | |
2b28ae19 BH |
476 | io_mask = PCI_IO_RANGE_MASK; |
477 | if (bridge->io_window_1k) | |
478 | io_mask = PCI_IO_1K_RANGE_MASK; | |
479 | ||
1da177e4 | 480 | /* Set up the top and bottom of the PCI I/O segment for this bus. */ |
c7dabef8 BH |
481 | res = bus->resource[0]; |
482 | pcibios_resource_to_bus(bridge, ®ion, res); | |
483 | if (res->flags & IORESOURCE_IO) { | |
1da177e4 LT |
484 | pci_read_config_dword(bridge, PCI_IO_BASE, &l); |
485 | l &= 0xffff0000; | |
2b28ae19 BH |
486 | io_base_lo = (region.start >> 8) & io_mask; |
487 | io_limit_lo = (region.end >> 8) & io_mask; | |
488 | l |= ((u32) io_limit_lo << 8) | io_base_lo; | |
1da177e4 LT |
489 | /* Set up upper 16 bits of I/O base/limit. */ |
490 | io_upper16 = (region.end & 0xffff0000) | (region.start >> 16); | |
c7dabef8 | 491 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
7cc5997d | 492 | } else { |
1da177e4 LT |
493 | /* Clear upper 16 bits of I/O base/limit. */ |
494 | io_upper16 = 0; | |
495 | l = 0x00f0; | |
1da177e4 LT |
496 | } |
497 | /* Temporarily disable the I/O range before updating PCI_IO_BASE. */ | |
498 | pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff); | |
499 | /* Update lower 16 bits of I/O base/limit. */ | |
500 | pci_write_config_dword(bridge, PCI_IO_BASE, l); | |
501 | /* Update upper 16 bits of I/O base/limit. */ | |
502 | pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16); | |
7cc5997d YL |
503 | } |
504 | ||
505 | static void pci_setup_bridge_mmio(struct pci_bus *bus) | |
506 | { | |
507 | struct pci_dev *bridge = bus->self; | |
508 | struct resource *res; | |
509 | struct pci_bus_region region; | |
510 | u32 l; | |
1da177e4 | 511 | |
7cc5997d | 512 | /* Set up the top and bottom of the PCI Memory segment for this bus. */ |
c7dabef8 BH |
513 | res = bus->resource[1]; |
514 | pcibios_resource_to_bus(bridge, ®ion, res); | |
515 | if (res->flags & IORESOURCE_MEM) { | |
1da177e4 LT |
516 | l = (region.start >> 16) & 0xfff0; |
517 | l |= region.end & 0xfff00000; | |
c7dabef8 | 518 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
7cc5997d | 519 | } else { |
1da177e4 | 520 | l = 0x0000fff0; |
1da177e4 LT |
521 | } |
522 | pci_write_config_dword(bridge, PCI_MEMORY_BASE, l); | |
7cc5997d YL |
523 | } |
524 | ||
525 | static void pci_setup_bridge_mmio_pref(struct pci_bus *bus) | |
526 | { | |
527 | struct pci_dev *bridge = bus->self; | |
528 | struct resource *res; | |
529 | struct pci_bus_region region; | |
530 | u32 l, bu, lu; | |
1da177e4 LT |
531 | |
532 | /* Clear out the upper 32 bits of PREF limit. | |
533 | If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily | |
534 | disables PREF range, which is ok. */ | |
535 | pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0); | |
536 | ||
537 | /* Set up PREF base/limit. */ | |
c40a22e0 | 538 | bu = lu = 0; |
c7dabef8 BH |
539 | res = bus->resource[2]; |
540 | pcibios_resource_to_bus(bridge, ®ion, res); | |
541 | if (res->flags & IORESOURCE_PREFETCH) { | |
1da177e4 LT |
542 | l = (region.start >> 16) & 0xfff0; |
543 | l |= region.end & 0xfff00000; | |
c7dabef8 | 544 | if (res->flags & IORESOURCE_MEM_64) { |
1f82de10 YL |
545 | bu = upper_32_bits(region.start); |
546 | lu = upper_32_bits(region.end); | |
1f82de10 | 547 | } |
c7dabef8 | 548 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
7cc5997d | 549 | } else { |
1da177e4 | 550 | l = 0x0000fff0; |
1da177e4 LT |
551 | } |
552 | pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l); | |
553 | ||
59353ea3 AW |
554 | /* Set the upper 32 bits of PREF base & limit. */ |
555 | pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu); | |
556 | pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu); | |
7cc5997d YL |
557 | } |
558 | ||
559 | static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type) | |
560 | { | |
561 | struct pci_dev *bridge = bus->self; | |
562 | ||
b918c62e YL |
563 | dev_info(&bridge->dev, "PCI bridge to %pR\n", |
564 | &bus->busn_res); | |
7cc5997d YL |
565 | |
566 | if (type & IORESOURCE_IO) | |
567 | pci_setup_bridge_io(bus); | |
568 | ||
569 | if (type & IORESOURCE_MEM) | |
570 | pci_setup_bridge_mmio(bus); | |
571 | ||
572 | if (type & IORESOURCE_PREFETCH) | |
573 | pci_setup_bridge_mmio_pref(bus); | |
1da177e4 LT |
574 | |
575 | pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl); | |
576 | } | |
577 | ||
e2444273 | 578 | void pci_setup_bridge(struct pci_bus *bus) |
7cc5997d YL |
579 | { |
580 | unsigned long type = IORESOURCE_IO | IORESOURCE_MEM | | |
581 | IORESOURCE_PREFETCH; | |
582 | ||
583 | __pci_setup_bridge(bus, type); | |
584 | } | |
585 | ||
1da177e4 LT |
586 | /* Check whether the bridge supports optional I/O and |
587 | prefetchable memory ranges. If not, the respective | |
588 | base/limit registers must be read-only and read as 0. */ | |
96bde06a | 589 | static void pci_bridge_check_ranges(struct pci_bus *bus) |
1da177e4 LT |
590 | { |
591 | u16 io; | |
592 | u32 pmem; | |
593 | struct pci_dev *bridge = bus->self; | |
594 | struct resource *b_res; | |
595 | ||
596 | b_res = &bridge->resource[PCI_BRIDGE_RESOURCES]; | |
597 | b_res[1].flags |= IORESOURCE_MEM; | |
598 | ||
599 | pci_read_config_word(bridge, PCI_IO_BASE, &io); | |
600 | if (!io) { | |
601 | pci_write_config_word(bridge, PCI_IO_BASE, 0xf0f0); | |
602 | pci_read_config_word(bridge, PCI_IO_BASE, &io); | |
603 | pci_write_config_word(bridge, PCI_IO_BASE, 0x0); | |
604 | } | |
605 | if (io) | |
606 | b_res[0].flags |= IORESOURCE_IO; | |
607 | /* DECchip 21050 pass 2 errata: the bridge may miss an address | |
608 | disconnect boundary by one PCI data phase. | |
609 | Workaround: do not use prefetching on this device. */ | |
610 | if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001) | |
611 | return; | |
612 | pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem); | |
613 | if (!pmem) { | |
614 | pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, | |
615 | 0xfff0fff0); | |
616 | pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem); | |
617 | pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0); | |
618 | } | |
1f82de10 | 619 | if (pmem) { |
1da177e4 | 620 | b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH; |
99586105 YL |
621 | if ((pmem & PCI_PREF_RANGE_TYPE_MASK) == |
622 | PCI_PREF_RANGE_TYPE_64) { | |
1f82de10 | 623 | b_res[2].flags |= IORESOURCE_MEM_64; |
99586105 YL |
624 | b_res[2].flags |= PCI_PREF_RANGE_TYPE_64; |
625 | } | |
1f82de10 YL |
626 | } |
627 | ||
628 | /* double check if bridge does support 64 bit pref */ | |
629 | if (b_res[2].flags & IORESOURCE_MEM_64) { | |
630 | u32 mem_base_hi, tmp; | |
631 | pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, | |
632 | &mem_base_hi); | |
633 | pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, | |
634 | 0xffffffff); | |
635 | pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp); | |
636 | if (!tmp) | |
637 | b_res[2].flags &= ~IORESOURCE_MEM_64; | |
638 | pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, | |
639 | mem_base_hi); | |
640 | } | |
1da177e4 LT |
641 | } |
642 | ||
643 | /* Helper function for sizing routines: find first available | |
644 | bus resource of a given type. Note: we intentionally skip | |
645 | the bus resources which have already been assigned (that is, | |
646 | have non-NULL parent resource). */ | |
96bde06a | 647 | static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type) |
1da177e4 LT |
648 | { |
649 | int i; | |
650 | struct resource *r; | |
651 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | | |
652 | IORESOURCE_PREFETCH; | |
653 | ||
89a74ecc | 654 | pci_bus_for_each_resource(bus, r, i) { |
299de034 IK |
655 | if (r == &ioport_resource || r == &iomem_resource) |
656 | continue; | |
55a10984 JB |
657 | if (r && (r->flags & type_mask) == type && !r->parent) |
658 | return r; | |
1da177e4 LT |
659 | } |
660 | return NULL; | |
661 | } | |
662 | ||
13583b16 RP |
663 | static resource_size_t calculate_iosize(resource_size_t size, |
664 | resource_size_t min_size, | |
665 | resource_size_t size1, | |
666 | resource_size_t old_size, | |
667 | resource_size_t align) | |
668 | { | |
669 | if (size < min_size) | |
670 | size = min_size; | |
671 | if (old_size == 1 ) | |
672 | old_size = 0; | |
673 | /* To be fixed in 2.5: we should have sort of HAVE_ISA | |
674 | flag in the struct pci_bus. */ | |
675 | #if defined(CONFIG_ISA) || defined(CONFIG_EISA) | |
676 | size = (size & 0xff) + ((size & ~0xffUL) << 2); | |
677 | #endif | |
678 | size = ALIGN(size + size1, align); | |
679 | if (size < old_size) | |
680 | size = old_size; | |
681 | return size; | |
682 | } | |
683 | ||
684 | static resource_size_t calculate_memsize(resource_size_t size, | |
685 | resource_size_t min_size, | |
686 | resource_size_t size1, | |
687 | resource_size_t old_size, | |
688 | resource_size_t align) | |
689 | { | |
690 | if (size < min_size) | |
691 | size = min_size; | |
692 | if (old_size == 1 ) | |
693 | old_size = 0; | |
694 | if (size < old_size) | |
695 | size = old_size; | |
696 | size = ALIGN(size + size1, align); | |
697 | return size; | |
698 | } | |
699 | ||
ac5ad93e GS |
700 | resource_size_t __weak pcibios_window_alignment(struct pci_bus *bus, |
701 | unsigned long type) | |
702 | { | |
703 | return 1; | |
704 | } | |
705 | ||
706 | #define PCI_P2P_DEFAULT_MEM_ALIGN 0x100000 /* 1MiB */ | |
707 | #define PCI_P2P_DEFAULT_IO_ALIGN 0x1000 /* 4KiB */ | |
708 | #define PCI_P2P_DEFAULT_IO_ALIGN_1K 0x400 /* 1KiB */ | |
709 | ||
710 | static resource_size_t window_alignment(struct pci_bus *bus, | |
711 | unsigned long type) | |
712 | { | |
713 | resource_size_t align = 1, arch_align; | |
714 | ||
715 | if (type & IORESOURCE_MEM) | |
716 | align = PCI_P2P_DEFAULT_MEM_ALIGN; | |
717 | else if (type & IORESOURCE_IO) { | |
718 | /* | |
719 | * Per spec, I/O windows are 4K-aligned, but some | |
720 | * bridges have an extension to support 1K alignment. | |
721 | */ | |
722 | if (bus->self->io_window_1k) | |
723 | align = PCI_P2P_DEFAULT_IO_ALIGN_1K; | |
724 | else | |
725 | align = PCI_P2P_DEFAULT_IO_ALIGN; | |
726 | } | |
727 | ||
728 | arch_align = pcibios_window_alignment(bus, type); | |
729 | return max(align, arch_align); | |
730 | } | |
731 | ||
c8adf9a3 RP |
732 | /** |
733 | * pbus_size_io() - size the io window of a given bus | |
734 | * | |
735 | * @bus : the bus | |
736 | * @min_size : the minimum io window that must to be allocated | |
737 | * @add_size : additional optional io window | |
9e8bf93a | 738 | * @realloc_head : track the additional io window on this list |
c8adf9a3 RP |
739 | * |
740 | * Sizing the IO windows of the PCI-PCI bridge is trivial, | |
fd591341 | 741 | * since these windows have 1K or 4K granularity and the IO ranges |
c8adf9a3 RP |
742 | * of non-bridge PCI devices are limited to 256 bytes. |
743 | * We must be careful with the ISA aliasing though. | |
744 | */ | |
745 | static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, | |
bdc4abec | 746 | resource_size_t add_size, struct list_head *realloc_head) |
1da177e4 LT |
747 | { |
748 | struct pci_dev *dev; | |
749 | struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO); | |
c8adf9a3 | 750 | unsigned long size = 0, size0 = 0, size1 = 0; |
be768912 | 751 | resource_size_t children_add_size = 0; |
fd591341 | 752 | resource_size_t min_align = 4096, align; |
1da177e4 LT |
753 | |
754 | if (!b_res) | |
755 | return; | |
756 | ||
fd591341 YL |
757 | /* |
758 | * Per spec, I/O windows are 4K-aligned, but some bridges have an | |
759 | * extension to support 1K alignment. | |
760 | */ | |
761 | if (bus->self->io_window_1k) | |
762 | min_align = 1024; | |
1da177e4 LT |
763 | list_for_each_entry(dev, &bus->devices, bus_list) { |
764 | int i; | |
765 | ||
766 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
767 | struct resource *r = &dev->resource[i]; | |
768 | unsigned long r_size; | |
769 | ||
770 | if (r->parent || !(r->flags & IORESOURCE_IO)) | |
771 | continue; | |
022edd86 | 772 | r_size = resource_size(r); |
1da177e4 LT |
773 | |
774 | if (r_size < 0x400) | |
775 | /* Might be re-aligned for ISA */ | |
776 | size += r_size; | |
777 | else | |
778 | size1 += r_size; | |
be768912 | 779 | |
fd591341 YL |
780 | align = pci_resource_alignment(dev, r); |
781 | if (align > min_align) | |
782 | min_align = align; | |
783 | ||
9e8bf93a RP |
784 | if (realloc_head) |
785 | children_add_size += get_res_add_size(realloc_head, r); | |
1da177e4 LT |
786 | } |
787 | } | |
fd591341 YL |
788 | |
789 | if (min_align > 4096) | |
790 | min_align = 4096; | |
791 | ||
c8adf9a3 | 792 | size0 = calculate_iosize(size, min_size, size1, |
fd591341 | 793 | resource_size(b_res), min_align); |
be768912 YL |
794 | if (children_add_size > add_size) |
795 | add_size = children_add_size; | |
9e8bf93a | 796 | size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 : |
a4ac9fea | 797 | calculate_iosize(size, min_size, add_size + size1, |
fd591341 | 798 | resource_size(b_res), min_align); |
c8adf9a3 | 799 | if (!size0 && !size1) { |
865df576 BH |
800 | if (b_res->start || b_res->end) |
801 | dev_info(&bus->self->dev, "disabling bridge window " | |
b918c62e YL |
802 | "%pR to %pR (unused)\n", b_res, |
803 | &bus->busn_res); | |
1da177e4 LT |
804 | b_res->flags = 0; |
805 | return; | |
806 | } | |
fd591341 YL |
807 | |
808 | b_res->start = min_align; | |
c8adf9a3 | 809 | b_res->end = b_res->start + size0 - 1; |
88452565 | 810 | b_res->flags |= IORESOURCE_STARTALIGN; |
b592443d | 811 | if (size1 > size0 && realloc_head) { |
fd591341 YL |
812 | add_to_list(realloc_head, bus->self, b_res, size1-size0, |
813 | min_align); | |
b592443d | 814 | dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window " |
b918c62e YL |
815 | "%pR to %pR add_size %lx\n", b_res, |
816 | &bus->busn_res, size1-size0); | |
b592443d | 817 | } |
1da177e4 LT |
818 | } |
819 | ||
c8adf9a3 RP |
820 | /** |
821 | * pbus_size_mem() - size the memory window of a given bus | |
822 | * | |
823 | * @bus : the bus | |
824 | * @min_size : the minimum memory window that must to be allocated | |
825 | * @add_size : additional optional memory window | |
9e8bf93a | 826 | * @realloc_head : track the additional memory window on this list |
c8adf9a3 RP |
827 | * |
828 | * Calculate the size of the bus and minimal alignment which | |
829 | * guarantees that all child resources fit in this size. | |
830 | */ | |
28760489 | 831 | static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, |
c8adf9a3 RP |
832 | unsigned long type, resource_size_t min_size, |
833 | resource_size_t add_size, | |
bdc4abec | 834 | struct list_head *realloc_head) |
1da177e4 LT |
835 | { |
836 | struct pci_dev *dev; | |
c8adf9a3 | 837 | resource_size_t min_align, align, size, size0, size1; |
c40a22e0 | 838 | resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */ |
1da177e4 LT |
839 | int order, max_order; |
840 | struct resource *b_res = find_free_bus_resource(bus, type); | |
1f82de10 | 841 | unsigned int mem64_mask = 0; |
be768912 | 842 | resource_size_t children_add_size = 0; |
1da177e4 LT |
843 | |
844 | if (!b_res) | |
845 | return 0; | |
846 | ||
847 | memset(aligns, 0, sizeof(aligns)); | |
848 | max_order = 0; | |
849 | size = 0; | |
850 | ||
1f82de10 YL |
851 | mem64_mask = b_res->flags & IORESOURCE_MEM_64; |
852 | b_res->flags &= ~IORESOURCE_MEM_64; | |
853 | ||
1da177e4 LT |
854 | list_for_each_entry(dev, &bus->devices, bus_list) { |
855 | int i; | |
1f82de10 | 856 | |
1da177e4 LT |
857 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
858 | struct resource *r = &dev->resource[i]; | |
c40a22e0 | 859 | resource_size_t r_size; |
1da177e4 LT |
860 | |
861 | if (r->parent || (r->flags & mask) != type) | |
862 | continue; | |
022edd86 | 863 | r_size = resource_size(r); |
2aceefcb YL |
864 | #ifdef CONFIG_PCI_IOV |
865 | /* put SRIOV requested res to the optional list */ | |
9e8bf93a | 866 | if (realloc_head && i >= PCI_IOV_RESOURCES && |
2aceefcb YL |
867 | i <= PCI_IOV_RESOURCE_END) { |
868 | r->end = r->start - 1; | |
9e8bf93a | 869 | add_to_list(realloc_head, dev, r, r_size, 0/* dont' care */); |
2aceefcb YL |
870 | children_add_size += r_size; |
871 | continue; | |
872 | } | |
873 | #endif | |
1da177e4 | 874 | /* For bridges size != alignment */ |
6faf17f6 | 875 | align = pci_resource_alignment(dev, r); |
1da177e4 LT |
876 | order = __ffs(align) - 20; |
877 | if (order > 11) { | |
865df576 BH |
878 | dev_warn(&dev->dev, "disabling BAR %d: %pR " |
879 | "(bad alignment %#llx)\n", i, r, | |
880 | (unsigned long long) align); | |
1da177e4 LT |
881 | r->flags = 0; |
882 | continue; | |
883 | } | |
884 | size += r_size; | |
885 | if (order < 0) | |
886 | order = 0; | |
887 | /* Exclude ranges with size > align from | |
888 | calculation of the alignment. */ | |
889 | if (r_size == align) | |
890 | aligns[order] += align; | |
891 | if (order > max_order) | |
892 | max_order = order; | |
1f82de10 | 893 | mem64_mask &= r->flags & IORESOURCE_MEM_64; |
be768912 | 894 | |
9e8bf93a RP |
895 | if (realloc_head) |
896 | children_add_size += get_res_add_size(realloc_head, r); | |
1da177e4 LT |
897 | } |
898 | } | |
1da177e4 LT |
899 | align = 0; |
900 | min_align = 0; | |
901 | for (order = 0; order <= max_order; order++) { | |
8308c54d JF |
902 | resource_size_t align1 = 1; |
903 | ||
904 | align1 <<= (order + 20); | |
905 | ||
1da177e4 LT |
906 | if (!align) |
907 | min_align = align1; | |
6f6f8c2f | 908 | else if (ALIGN(align + min_align, min_align) < align1) |
1da177e4 LT |
909 | min_align = align1 >> 1; |
910 | align += aligns[order]; | |
911 | } | |
b42282e5 | 912 | size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align); |
be768912 YL |
913 | if (children_add_size > add_size) |
914 | add_size = children_add_size; | |
9e8bf93a | 915 | size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 : |
a4ac9fea | 916 | calculate_memsize(size, min_size, add_size, |
b42282e5 | 917 | resource_size(b_res), min_align); |
c8adf9a3 | 918 | if (!size0 && !size1) { |
865df576 BH |
919 | if (b_res->start || b_res->end) |
920 | dev_info(&bus->self->dev, "disabling bridge window " | |
b918c62e YL |
921 | "%pR to %pR (unused)\n", b_res, |
922 | &bus->busn_res); | |
1da177e4 LT |
923 | b_res->flags = 0; |
924 | return 1; | |
925 | } | |
926 | b_res->start = min_align; | |
c8adf9a3 RP |
927 | b_res->end = size0 + min_align - 1; |
928 | b_res->flags |= IORESOURCE_STARTALIGN | mem64_mask; | |
b592443d | 929 | if (size1 > size0 && realloc_head) { |
9e8bf93a | 930 | add_to_list(realloc_head, bus->self, b_res, size1-size0, min_align); |
b592443d | 931 | dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window " |
b918c62e YL |
932 | "%pR to %pR add_size %llx\n", b_res, |
933 | &bus->busn_res, (unsigned long long)size1-size0); | |
b592443d | 934 | } |
1da177e4 LT |
935 | return 1; |
936 | } | |
937 | ||
0a2daa1c RP |
938 | unsigned long pci_cardbus_resource_alignment(struct resource *res) |
939 | { | |
940 | if (res->flags & IORESOURCE_IO) | |
941 | return pci_cardbus_io_size; | |
942 | if (res->flags & IORESOURCE_MEM) | |
943 | return pci_cardbus_mem_size; | |
944 | return 0; | |
945 | } | |
946 | ||
947 | static void pci_bus_size_cardbus(struct pci_bus *bus, | |
bdc4abec | 948 | struct list_head *realloc_head) |
1da177e4 LT |
949 | { |
950 | struct pci_dev *bridge = bus->self; | |
951 | struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES]; | |
11848934 | 952 | resource_size_t b_res_3_size = pci_cardbus_mem_size * 2; |
1da177e4 LT |
953 | u16 ctrl; |
954 | ||
3796f1e2 YL |
955 | if (b_res[0].parent) |
956 | goto handle_b_res_1; | |
1da177e4 LT |
957 | /* |
958 | * Reserve some resources for CardBus. We reserve | |
959 | * a fixed amount of bus space for CardBus bridges. | |
960 | */ | |
11848934 YL |
961 | b_res[0].start = pci_cardbus_io_size; |
962 | b_res[0].end = b_res[0].start + pci_cardbus_io_size - 1; | |
963 | b_res[0].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN; | |
964 | if (realloc_head) { | |
965 | b_res[0].end -= pci_cardbus_io_size; | |
966 | add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size, | |
967 | pci_cardbus_io_size); | |
968 | } | |
1da177e4 | 969 | |
3796f1e2 YL |
970 | handle_b_res_1: |
971 | if (b_res[1].parent) | |
972 | goto handle_b_res_2; | |
11848934 YL |
973 | b_res[1].start = pci_cardbus_io_size; |
974 | b_res[1].end = b_res[1].start + pci_cardbus_io_size - 1; | |
975 | b_res[1].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN; | |
976 | if (realloc_head) { | |
977 | b_res[1].end -= pci_cardbus_io_size; | |
978 | add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size, | |
979 | pci_cardbus_io_size); | |
980 | } | |
1da177e4 | 981 | |
3796f1e2 | 982 | handle_b_res_2: |
dcef0d06 YL |
983 | /* MEM1 must not be pref mmio */ |
984 | pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); | |
985 | if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM1) { | |
986 | ctrl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1; | |
987 | pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl); | |
988 | pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); | |
989 | } | |
990 | ||
1da177e4 LT |
991 | /* |
992 | * Check whether prefetchable memory is supported | |
993 | * by this bridge. | |
994 | */ | |
995 | pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); | |
996 | if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) { | |
997 | ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0; | |
998 | pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl); | |
999 | pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); | |
1000 | } | |
1001 | ||
3796f1e2 YL |
1002 | if (b_res[2].parent) |
1003 | goto handle_b_res_3; | |
1da177e4 LT |
1004 | /* |
1005 | * If we have prefetchable memory support, allocate | |
1006 | * two regions. Otherwise, allocate one region of | |
1007 | * twice the size. | |
1008 | */ | |
1009 | if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) { | |
11848934 YL |
1010 | b_res[2].start = pci_cardbus_mem_size; |
1011 | b_res[2].end = b_res[2].start + pci_cardbus_mem_size - 1; | |
1012 | b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | | |
1013 | IORESOURCE_STARTALIGN; | |
1014 | if (realloc_head) { | |
1015 | b_res[2].end -= pci_cardbus_mem_size; | |
1016 | add_to_list(realloc_head, bridge, b_res+2, | |
1017 | pci_cardbus_mem_size, pci_cardbus_mem_size); | |
1018 | } | |
1019 | ||
1020 | /* reduce that to half */ | |
1021 | b_res_3_size = pci_cardbus_mem_size; | |
1022 | } | |
1023 | ||
3796f1e2 YL |
1024 | handle_b_res_3: |
1025 | if (b_res[3].parent) | |
1026 | goto handle_done; | |
11848934 YL |
1027 | b_res[3].start = pci_cardbus_mem_size; |
1028 | b_res[3].end = b_res[3].start + b_res_3_size - 1; | |
1029 | b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN; | |
1030 | if (realloc_head) { | |
1031 | b_res[3].end -= b_res_3_size; | |
1032 | add_to_list(realloc_head, bridge, b_res+3, b_res_3_size, | |
1033 | pci_cardbus_mem_size); | |
1034 | } | |
3796f1e2 YL |
1035 | |
1036 | handle_done: | |
1037 | ; | |
1da177e4 LT |
1038 | } |
1039 | ||
c8adf9a3 | 1040 | void __ref __pci_bus_size_bridges(struct pci_bus *bus, |
bdc4abec | 1041 | struct list_head *realloc_head) |
1da177e4 LT |
1042 | { |
1043 | struct pci_dev *dev; | |
1044 | unsigned long mask, prefmask; | |
c8adf9a3 | 1045 | resource_size_t additional_mem_size = 0, additional_io_size = 0; |
1da177e4 LT |
1046 | |
1047 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1048 | struct pci_bus *b = dev->subordinate; | |
1049 | if (!b) | |
1050 | continue; | |
1051 | ||
1052 | switch (dev->class >> 8) { | |
1053 | case PCI_CLASS_BRIDGE_CARDBUS: | |
9e8bf93a | 1054 | pci_bus_size_cardbus(b, realloc_head); |
1da177e4 LT |
1055 | break; |
1056 | ||
1057 | case PCI_CLASS_BRIDGE_PCI: | |
1058 | default: | |
9e8bf93a | 1059 | __pci_bus_size_bridges(b, realloc_head); |
1da177e4 LT |
1060 | break; |
1061 | } | |
1062 | } | |
1063 | ||
1064 | /* The root bus? */ | |
1065 | if (!bus->self) | |
1066 | return; | |
1067 | ||
1068 | switch (bus->self->class >> 8) { | |
1069 | case PCI_CLASS_BRIDGE_CARDBUS: | |
1070 | /* don't size cardbuses yet. */ | |
1071 | break; | |
1072 | ||
1073 | case PCI_CLASS_BRIDGE_PCI: | |
1074 | pci_bridge_check_ranges(bus); | |
28760489 | 1075 | if (bus->self->is_hotplug_bridge) { |
c8adf9a3 RP |
1076 | additional_io_size = pci_hotplug_io_size; |
1077 | additional_mem_size = pci_hotplug_mem_size; | |
28760489 | 1078 | } |
c8adf9a3 RP |
1079 | /* |
1080 | * Follow thru | |
1081 | */ | |
1da177e4 | 1082 | default: |
19aa7ee4 YL |
1083 | pbus_size_io(bus, realloc_head ? 0 : additional_io_size, |
1084 | additional_io_size, realloc_head); | |
1da177e4 LT |
1085 | /* If the bridge supports prefetchable range, size it |
1086 | separately. If it doesn't, or its prefetchable window | |
1087 | has already been allocated by arch code, try | |
1088 | non-prefetchable range for both types of PCI memory | |
1089 | resources. */ | |
1090 | mask = IORESOURCE_MEM; | |
1091 | prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
19aa7ee4 YL |
1092 | if (pbus_size_mem(bus, prefmask, prefmask, |
1093 | realloc_head ? 0 : additional_mem_size, | |
1094 | additional_mem_size, realloc_head)) | |
1da177e4 | 1095 | mask = prefmask; /* Success, size non-prefetch only. */ |
28760489 | 1096 | else |
c8adf9a3 | 1097 | additional_mem_size += additional_mem_size; |
19aa7ee4 YL |
1098 | pbus_size_mem(bus, mask, IORESOURCE_MEM, |
1099 | realloc_head ? 0 : additional_mem_size, | |
1100 | additional_mem_size, realloc_head); | |
1da177e4 LT |
1101 | break; |
1102 | } | |
1103 | } | |
c8adf9a3 RP |
1104 | |
1105 | void __ref pci_bus_size_bridges(struct pci_bus *bus) | |
1106 | { | |
1107 | __pci_bus_size_bridges(bus, NULL); | |
1108 | } | |
1da177e4 LT |
1109 | EXPORT_SYMBOL(pci_bus_size_bridges); |
1110 | ||
568ddef8 | 1111 | static void __ref __pci_bus_assign_resources(const struct pci_bus *bus, |
bdc4abec YL |
1112 | struct list_head *realloc_head, |
1113 | struct list_head *fail_head) | |
1da177e4 LT |
1114 | { |
1115 | struct pci_bus *b; | |
1116 | struct pci_dev *dev; | |
1117 | ||
9e8bf93a | 1118 | pbus_assign_resources_sorted(bus, realloc_head, fail_head); |
1da177e4 | 1119 | |
1da177e4 LT |
1120 | list_for_each_entry(dev, &bus->devices, bus_list) { |
1121 | b = dev->subordinate; | |
1122 | if (!b) | |
1123 | continue; | |
1124 | ||
9e8bf93a | 1125 | __pci_bus_assign_resources(b, realloc_head, fail_head); |
1da177e4 LT |
1126 | |
1127 | switch (dev->class >> 8) { | |
1128 | case PCI_CLASS_BRIDGE_PCI: | |
6841ec68 YL |
1129 | if (!pci_is_enabled(dev)) |
1130 | pci_setup_bridge(b); | |
1da177e4 LT |
1131 | break; |
1132 | ||
1133 | case PCI_CLASS_BRIDGE_CARDBUS: | |
1134 | pci_setup_cardbus(b); | |
1135 | break; | |
1136 | ||
1137 | default: | |
80ccba11 BH |
1138 | dev_info(&dev->dev, "not setting up bridge for bus " |
1139 | "%04x:%02x\n", pci_domain_nr(b), b->number); | |
1da177e4 LT |
1140 | break; |
1141 | } | |
1142 | } | |
1143 | } | |
568ddef8 YL |
1144 | |
1145 | void __ref pci_bus_assign_resources(const struct pci_bus *bus) | |
1146 | { | |
c8adf9a3 | 1147 | __pci_bus_assign_resources(bus, NULL, NULL); |
568ddef8 | 1148 | } |
1da177e4 LT |
1149 | EXPORT_SYMBOL(pci_bus_assign_resources); |
1150 | ||
6841ec68 | 1151 | static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge, |
bdc4abec YL |
1152 | struct list_head *add_head, |
1153 | struct list_head *fail_head) | |
6841ec68 YL |
1154 | { |
1155 | struct pci_bus *b; | |
1156 | ||
8424d759 YL |
1157 | pdev_assign_resources_sorted((struct pci_dev *)bridge, |
1158 | add_head, fail_head); | |
6841ec68 YL |
1159 | |
1160 | b = bridge->subordinate; | |
1161 | if (!b) | |
1162 | return; | |
1163 | ||
8424d759 | 1164 | __pci_bus_assign_resources(b, add_head, fail_head); |
6841ec68 YL |
1165 | |
1166 | switch (bridge->class >> 8) { | |
1167 | case PCI_CLASS_BRIDGE_PCI: | |
1168 | pci_setup_bridge(b); | |
1169 | break; | |
1170 | ||
1171 | case PCI_CLASS_BRIDGE_CARDBUS: | |
1172 | pci_setup_cardbus(b); | |
1173 | break; | |
1174 | ||
1175 | default: | |
1176 | dev_info(&bridge->dev, "not setting up bridge for bus " | |
1177 | "%04x:%02x\n", pci_domain_nr(b), b->number); | |
1178 | break; | |
1179 | } | |
1180 | } | |
5009b460 YL |
1181 | static void pci_bridge_release_resources(struct pci_bus *bus, |
1182 | unsigned long type) | |
1183 | { | |
1184 | int idx; | |
1185 | bool changed = false; | |
1186 | struct pci_dev *dev; | |
1187 | struct resource *r; | |
1188 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | | |
1189 | IORESOURCE_PREFETCH; | |
1190 | ||
1191 | dev = bus->self; | |
1192 | for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END; | |
1193 | idx++) { | |
1194 | r = &dev->resource[idx]; | |
1195 | if ((r->flags & type_mask) != type) | |
1196 | continue; | |
1197 | if (!r->parent) | |
1198 | continue; | |
1199 | /* | |
1200 | * if there are children under that, we should release them | |
1201 | * all | |
1202 | */ | |
1203 | release_child_resources(r); | |
1204 | if (!release_resource(r)) { | |
1205 | dev_printk(KERN_DEBUG, &dev->dev, | |
1206 | "resource %d %pR released\n", idx, r); | |
1207 | /* keep the old size */ | |
1208 | r->end = resource_size(r) - 1; | |
1209 | r->start = 0; | |
1210 | r->flags = 0; | |
1211 | changed = true; | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | if (changed) { | |
1216 | /* avoiding touch the one without PREF */ | |
1217 | if (type & IORESOURCE_PREFETCH) | |
1218 | type = IORESOURCE_PREFETCH; | |
1219 | __pci_setup_bridge(bus, type); | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | enum release_type { | |
1224 | leaf_only, | |
1225 | whole_subtree, | |
1226 | }; | |
1227 | /* | |
1228 | * try to release pci bridge resources that is from leaf bridge, | |
1229 | * so we can allocate big new one later | |
1230 | */ | |
1231 | static void __ref pci_bus_release_bridge_resources(struct pci_bus *bus, | |
1232 | unsigned long type, | |
1233 | enum release_type rel_type) | |
1234 | { | |
1235 | struct pci_dev *dev; | |
1236 | bool is_leaf_bridge = true; | |
1237 | ||
1238 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1239 | struct pci_bus *b = dev->subordinate; | |
1240 | if (!b) | |
1241 | continue; | |
1242 | ||
1243 | is_leaf_bridge = false; | |
1244 | ||
1245 | if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI) | |
1246 | continue; | |
1247 | ||
1248 | if (rel_type == whole_subtree) | |
1249 | pci_bus_release_bridge_resources(b, type, | |
1250 | whole_subtree); | |
1251 | } | |
1252 | ||
1253 | if (pci_is_root_bus(bus)) | |
1254 | return; | |
1255 | ||
1256 | if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI) | |
1257 | return; | |
1258 | ||
1259 | if ((rel_type == whole_subtree) || is_leaf_bridge) | |
1260 | pci_bridge_release_resources(bus, type); | |
1261 | } | |
1262 | ||
76fbc263 YL |
1263 | static void pci_bus_dump_res(struct pci_bus *bus) |
1264 | { | |
89a74ecc BH |
1265 | struct resource *res; |
1266 | int i; | |
7c9342b8 | 1267 | |
89a74ecc | 1268 | pci_bus_for_each_resource(bus, res, i) { |
7c9342b8 | 1269 | if (!res || !res->end || !res->flags) |
76fbc263 YL |
1270 | continue; |
1271 | ||
c7dabef8 | 1272 | dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res); |
76fbc263 YL |
1273 | } |
1274 | } | |
1275 | ||
1276 | static void pci_bus_dump_resources(struct pci_bus *bus) | |
1277 | { | |
1278 | struct pci_bus *b; | |
1279 | struct pci_dev *dev; | |
1280 | ||
1281 | ||
1282 | pci_bus_dump_res(bus); | |
1283 | ||
1284 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1285 | b = dev->subordinate; | |
1286 | if (!b) | |
1287 | continue; | |
1288 | ||
1289 | pci_bus_dump_resources(b); | |
1290 | } | |
1291 | } | |
1292 | ||
da7822e5 YL |
1293 | static int __init pci_bus_get_depth(struct pci_bus *bus) |
1294 | { | |
1295 | int depth = 0; | |
1296 | struct pci_dev *dev; | |
1297 | ||
1298 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1299 | int ret; | |
1300 | struct pci_bus *b = dev->subordinate; | |
1301 | if (!b) | |
1302 | continue; | |
1303 | ||
1304 | ret = pci_bus_get_depth(b); | |
1305 | if (ret + 1 > depth) | |
1306 | depth = ret + 1; | |
1307 | } | |
1308 | ||
1309 | return depth; | |
1310 | } | |
1311 | static int __init pci_get_max_depth(void) | |
1312 | { | |
1313 | int depth = 0; | |
1314 | struct pci_bus *bus; | |
1315 | ||
1316 | list_for_each_entry(bus, &pci_root_buses, node) { | |
1317 | int ret; | |
1318 | ||
1319 | ret = pci_bus_get_depth(bus); | |
1320 | if (ret > depth) | |
1321 | depth = ret; | |
1322 | } | |
1323 | ||
1324 | return depth; | |
1325 | } | |
1326 | ||
b55438fd YL |
1327 | /* |
1328 | * -1: undefined, will auto detect later | |
1329 | * 0: disabled by user | |
1330 | * 1: disabled by auto detect | |
1331 | * 2: enabled by user | |
1332 | * 3: enabled by auto detect | |
1333 | */ | |
1334 | enum enable_type { | |
1335 | undefined = -1, | |
1336 | user_disabled, | |
1337 | auto_disabled, | |
1338 | user_enabled, | |
1339 | auto_enabled, | |
1340 | }; | |
1341 | ||
1342 | static enum enable_type pci_realloc_enable __initdata = undefined; | |
1343 | void __init pci_realloc_get_opt(char *str) | |
1344 | { | |
1345 | if (!strncmp(str, "off", 3)) | |
1346 | pci_realloc_enable = user_disabled; | |
1347 | else if (!strncmp(str, "on", 2)) | |
1348 | pci_realloc_enable = user_enabled; | |
1349 | } | |
1350 | static bool __init pci_realloc_enabled(void) | |
1351 | { | |
1352 | return pci_realloc_enable >= user_enabled; | |
1353 | } | |
f483d392 | 1354 | |
b07f2ebc YL |
1355 | static void __init pci_realloc_detect(void) |
1356 | { | |
1357 | #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO) | |
1358 | struct pci_dev *dev = NULL; | |
1359 | ||
1360 | if (pci_realloc_enable != undefined) | |
1361 | return; | |
1362 | ||
1363 | for_each_pci_dev(dev) { | |
1364 | int i; | |
1365 | ||
1366 | for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) { | |
1367 | struct resource *r = &dev->resource[i]; | |
1368 | ||
1369 | /* Not assigned, or rejected by kernel ? */ | |
1370 | if (r->flags && !r->start) { | |
1371 | pci_realloc_enable = auto_enabled; | |
1372 | ||
1373 | return; | |
1374 | } | |
1375 | } | |
1376 | } | |
1377 | #endif | |
1378 | } | |
1379 | ||
da7822e5 YL |
1380 | /* |
1381 | * first try will not touch pci bridge res | |
1382 | * second and later try will clear small leaf bridge res | |
1383 | * will stop till to the max deepth if can not find good one | |
1384 | */ | |
1da177e4 LT |
1385 | void __init |
1386 | pci_assign_unassigned_resources(void) | |
1387 | { | |
1388 | struct pci_bus *bus; | |
bdc4abec | 1389 | LIST_HEAD(realloc_head); /* list of resources that |
c8adf9a3 | 1390 | want additional resources */ |
bdc4abec | 1391 | struct list_head *add_list = NULL; |
da7822e5 YL |
1392 | int tried_times = 0; |
1393 | enum release_type rel_type = leaf_only; | |
bdc4abec | 1394 | LIST_HEAD(fail_head); |
b9b0bba9 | 1395 | struct pci_dev_resource *fail_res; |
da7822e5 YL |
1396 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | |
1397 | IORESOURCE_PREFETCH; | |
19aa7ee4 | 1398 | int pci_try_num = 1; |
da7822e5 | 1399 | |
19aa7ee4 | 1400 | /* don't realloc if asked to do so */ |
b07f2ebc | 1401 | pci_realloc_detect(); |
19aa7ee4 YL |
1402 | if (pci_realloc_enabled()) { |
1403 | int max_depth = pci_get_max_depth(); | |
1404 | ||
1405 | pci_try_num = max_depth + 1; | |
1406 | printk(KERN_DEBUG "PCI: max bus depth: %d pci_try_num: %d\n", | |
1407 | max_depth, pci_try_num); | |
1408 | } | |
da7822e5 YL |
1409 | |
1410 | again: | |
19aa7ee4 YL |
1411 | /* |
1412 | * last try will use add_list, otherwise will try good to have as | |
1413 | * must have, so can realloc parent bridge resource | |
1414 | */ | |
1415 | if (tried_times + 1 == pci_try_num) | |
bdc4abec | 1416 | add_list = &realloc_head; |
1da177e4 LT |
1417 | /* Depth first, calculate sizes and alignments of all |
1418 | subordinate buses. */ | |
da7822e5 | 1419 | list_for_each_entry(bus, &pci_root_buses, node) |
19aa7ee4 | 1420 | __pci_bus_size_bridges(bus, add_list); |
c8adf9a3 | 1421 | |
1da177e4 | 1422 | /* Depth last, allocate resources and update the hardware. */ |
da7822e5 | 1423 | list_for_each_entry(bus, &pci_root_buses, node) |
bdc4abec | 1424 | __pci_bus_assign_resources(bus, add_list, &fail_head); |
19aa7ee4 | 1425 | if (add_list) |
bdc4abec | 1426 | BUG_ON(!list_empty(add_list)); |
da7822e5 YL |
1427 | tried_times++; |
1428 | ||
1429 | /* any device complain? */ | |
bdc4abec | 1430 | if (list_empty(&fail_head)) |
da7822e5 | 1431 | goto enable_and_dump; |
f483d392 | 1432 | |
0c5be0cb | 1433 | if (tried_times >= pci_try_num) { |
eb572e7c YL |
1434 | if (pci_realloc_enable == undefined) |
1435 | printk(KERN_INFO "Some PCI device resources are unassigned, try booting with pci=realloc\n"); | |
b07f2ebc YL |
1436 | else if (pci_realloc_enable == auto_enabled) |
1437 | printk(KERN_INFO "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n"); | |
eb572e7c | 1438 | |
bffc56d4 | 1439 | free_list(&fail_head); |
da7822e5 YL |
1440 | goto enable_and_dump; |
1441 | } | |
1442 | ||
1443 | printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n", | |
1444 | tried_times + 1); | |
1445 | ||
1446 | /* third times and later will not check if it is leaf */ | |
1447 | if ((tried_times + 1) > 2) | |
1448 | rel_type = whole_subtree; | |
1449 | ||
1450 | /* | |
1451 | * Try to release leaf bridge's resources that doesn't fit resource of | |
1452 | * child device under that bridge | |
1453 | */ | |
b9b0bba9 YL |
1454 | list_for_each_entry(fail_res, &fail_head, list) { |
1455 | bus = fail_res->dev->bus; | |
bdc4abec | 1456 | pci_bus_release_bridge_resources(bus, |
b9b0bba9 | 1457 | fail_res->flags & type_mask, |
bdc4abec | 1458 | rel_type); |
da7822e5 YL |
1459 | } |
1460 | /* restore size and flags */ | |
b9b0bba9 YL |
1461 | list_for_each_entry(fail_res, &fail_head, list) { |
1462 | struct resource *res = fail_res->res; | |
da7822e5 | 1463 | |
b9b0bba9 YL |
1464 | res->start = fail_res->start; |
1465 | res->end = fail_res->end; | |
1466 | res->flags = fail_res->flags; | |
1467 | if (fail_res->dev->subordinate) | |
da7822e5 | 1468 | res->flags = 0; |
da7822e5 | 1469 | } |
bffc56d4 | 1470 | free_list(&fail_head); |
da7822e5 YL |
1471 | |
1472 | goto again; | |
1473 | ||
1474 | enable_and_dump: | |
1475 | /* Depth last, update the hardware. */ | |
1476 | list_for_each_entry(bus, &pci_root_buses, node) | |
1477 | pci_enable_bridges(bus); | |
76fbc263 YL |
1478 | |
1479 | /* dump the resource on buses */ | |
da7822e5 | 1480 | list_for_each_entry(bus, &pci_root_buses, node) |
76fbc263 | 1481 | pci_bus_dump_resources(bus); |
1da177e4 | 1482 | } |
6841ec68 YL |
1483 | |
1484 | void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge) | |
1485 | { | |
1486 | struct pci_bus *parent = bridge->subordinate; | |
bdc4abec | 1487 | LIST_HEAD(add_list); /* list of resources that |
8424d759 | 1488 | want additional resources */ |
32180e40 | 1489 | int tried_times = 0; |
bdc4abec | 1490 | LIST_HEAD(fail_head); |
b9b0bba9 | 1491 | struct pci_dev_resource *fail_res; |
6841ec68 | 1492 | int retval; |
32180e40 YL |
1493 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | |
1494 | IORESOURCE_PREFETCH; | |
1495 | ||
32180e40 | 1496 | again: |
8424d759 | 1497 | __pci_bus_size_bridges(parent, &add_list); |
bdc4abec YL |
1498 | __pci_bridge_assign_resources(bridge, &add_list, &fail_head); |
1499 | BUG_ON(!list_empty(&add_list)); | |
32180e40 YL |
1500 | tried_times++; |
1501 | ||
bdc4abec | 1502 | if (list_empty(&fail_head)) |
3f579c34 | 1503 | goto enable_all; |
32180e40 YL |
1504 | |
1505 | if (tried_times >= 2) { | |
1506 | /* still fail, don't need to try more */ | |
bffc56d4 | 1507 | free_list(&fail_head); |
3f579c34 | 1508 | goto enable_all; |
32180e40 YL |
1509 | } |
1510 | ||
1511 | printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n", | |
1512 | tried_times + 1); | |
1513 | ||
1514 | /* | |
1515 | * Try to release leaf bridge's resources that doesn't fit resource of | |
1516 | * child device under that bridge | |
1517 | */ | |
b9b0bba9 YL |
1518 | list_for_each_entry(fail_res, &fail_head, list) { |
1519 | struct pci_bus *bus = fail_res->dev->bus; | |
1520 | unsigned long flags = fail_res->flags; | |
32180e40 YL |
1521 | |
1522 | pci_bus_release_bridge_resources(bus, flags & type_mask, | |
1523 | whole_subtree); | |
32180e40 YL |
1524 | } |
1525 | /* restore size and flags */ | |
b9b0bba9 YL |
1526 | list_for_each_entry(fail_res, &fail_head, list) { |
1527 | struct resource *res = fail_res->res; | |
32180e40 | 1528 | |
b9b0bba9 YL |
1529 | res->start = fail_res->start; |
1530 | res->end = fail_res->end; | |
1531 | res->flags = fail_res->flags; | |
1532 | if (fail_res->dev->subordinate) | |
32180e40 | 1533 | res->flags = 0; |
32180e40 | 1534 | } |
bffc56d4 | 1535 | free_list(&fail_head); |
32180e40 YL |
1536 | |
1537 | goto again; | |
3f579c34 YL |
1538 | |
1539 | enable_all: | |
1540 | retval = pci_reenable_device(bridge); | |
1541 | pci_set_master(bridge); | |
1542 | pci_enable_bridges(parent); | |
6841ec68 YL |
1543 | } |
1544 | EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources); | |
9b03088f YL |
1545 | |
1546 | #ifdef CONFIG_HOTPLUG | |
1547 | /** | |
1548 | * pci_rescan_bus - scan a PCI bus for devices. | |
1549 | * @bus: PCI bus to scan | |
1550 | * | |
1551 | * Scan a PCI bus and child buses for new devices, adds them, | |
1552 | * and enables them. | |
1553 | * | |
1554 | * Returns the max number of subordinate bus discovered. | |
1555 | */ | |
1556 | unsigned int __ref pci_rescan_bus(struct pci_bus *bus) | |
1557 | { | |
1558 | unsigned int max; | |
1559 | struct pci_dev *dev; | |
bdc4abec | 1560 | LIST_HEAD(add_list); /* list of resources that |
9b03088f YL |
1561 | want additional resources */ |
1562 | ||
1563 | max = pci_scan_child_bus(bus); | |
1564 | ||
9b03088f YL |
1565 | down_read(&pci_bus_sem); |
1566 | list_for_each_entry(dev, &bus->devices, bus_list) | |
1567 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
1568 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
1569 | if (dev->subordinate) | |
1570 | __pci_bus_size_bridges(dev->subordinate, | |
1571 | &add_list); | |
1572 | up_read(&pci_bus_sem); | |
1573 | __pci_bus_assign_resources(bus, &add_list, NULL); | |
bdc4abec | 1574 | BUG_ON(!list_empty(&add_list)); |
9b03088f YL |
1575 | |
1576 | pci_enable_bridges(bus); | |
1577 | pci_bus_add_devices(bus); | |
1578 | ||
1579 | return max; | |
1580 | } | |
1581 | EXPORT_SYMBOL_GPL(pci_rescan_bus); | |
1582 | #endif |