Commit | Line | Data |
---|---|---|
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) { |
3c78bc61 | 71 | pr_warn("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)) { | |
a3cb999d | 286 | if (fail_head) { |
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, | |
f7625980 BH |
295 | 0 /* don't care */, |
296 | 0 /* don't care */); | |
9a928660 | 297 | } |
fc075e1d | 298 | reset_resource(res); |
542df5de | 299 | } |
1da177e4 LT |
300 | } |
301 | } | |
302 | ||
aa914f5e YL |
303 | static unsigned long pci_fail_res_type_mask(struct list_head *fail_head) |
304 | { | |
305 | struct pci_dev_resource *fail_res; | |
306 | unsigned long mask = 0; | |
307 | ||
308 | /* check failed type */ | |
309 | list_for_each_entry(fail_res, fail_head, list) | |
310 | mask |= fail_res->flags; | |
311 | ||
312 | /* | |
313 | * one pref failed resource will set IORESOURCE_MEM, | |
314 | * as we can allocate pref in non-pref range. | |
315 | * Will release all assigned non-pref sibling resources | |
316 | * according to that bit. | |
317 | */ | |
318 | return mask & (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH); | |
319 | } | |
320 | ||
321 | static bool pci_need_to_release(unsigned long mask, struct resource *res) | |
322 | { | |
323 | if (res->flags & IORESOURCE_IO) | |
324 | return !!(mask & IORESOURCE_IO); | |
325 | ||
326 | /* check pref at first */ | |
327 | if (res->flags & IORESOURCE_PREFETCH) { | |
328 | if (mask & IORESOURCE_PREFETCH) | |
329 | return true; | |
330 | /* count pref if its parent is non-pref */ | |
331 | else if ((mask & IORESOURCE_MEM) && | |
332 | !(res->parent->flags & IORESOURCE_PREFETCH)) | |
333 | return true; | |
334 | else | |
335 | return false; | |
336 | } | |
337 | ||
338 | if (res->flags & IORESOURCE_MEM) | |
339 | return !!(mask & IORESOURCE_MEM); | |
340 | ||
341 | return false; /* should not get here */ | |
342 | } | |
343 | ||
bdc4abec YL |
344 | static void __assign_resources_sorted(struct list_head *head, |
345 | struct list_head *realloc_head, | |
346 | struct list_head *fail_head) | |
c8adf9a3 | 347 | { |
3e6e0d80 YL |
348 | /* |
349 | * Should not assign requested resources at first. | |
350 | * they could be adjacent, so later reassign can not reallocate | |
351 | * them one by one in parent resource window. | |
367fa982 | 352 | * Try to assign requested + add_size at beginning |
3e6e0d80 YL |
353 | * if could do that, could get out early. |
354 | * if could not do that, we still try to assign requested at first, | |
355 | * then try to reassign add_size for some resources. | |
aa914f5e YL |
356 | * |
357 | * Separate three resource type checking if we need to release | |
358 | * assigned resource after requested + add_size try. | |
359 | * 1. if there is io port assign fail, will release assigned | |
360 | * io port. | |
361 | * 2. if there is pref mmio assign fail, release assigned | |
362 | * pref mmio. | |
363 | * if assigned pref mmio's parent is non-pref mmio and there | |
364 | * is non-pref mmio assign fail, will release that assigned | |
365 | * pref mmio. | |
366 | * 3. if there is non-pref mmio assign fail or pref mmio | |
367 | * assigned fail, will release assigned non-pref mmio. | |
3e6e0d80 | 368 | */ |
bdc4abec YL |
369 | LIST_HEAD(save_head); |
370 | LIST_HEAD(local_fail_head); | |
b9b0bba9 | 371 | struct pci_dev_resource *save_res; |
aa914f5e YL |
372 | struct pci_dev_resource *dev_res, *tmp_res; |
373 | unsigned long fail_type; | |
3e6e0d80 YL |
374 | |
375 | /* Check if optional add_size is there */ | |
bdc4abec | 376 | if (!realloc_head || list_empty(realloc_head)) |
3e6e0d80 YL |
377 | goto requested_and_reassign; |
378 | ||
379 | /* Save original start, end, flags etc at first */ | |
bdc4abec YL |
380 | list_for_each_entry(dev_res, head, list) { |
381 | if (add_to_list(&save_head, dev_res->dev, dev_res->res, 0, 0)) { | |
bffc56d4 | 382 | free_list(&save_head); |
3e6e0d80 YL |
383 | goto requested_and_reassign; |
384 | } | |
bdc4abec | 385 | } |
3e6e0d80 YL |
386 | |
387 | /* Update res in head list with add_size in realloc_head list */ | |
bdc4abec YL |
388 | list_for_each_entry(dev_res, head, list) |
389 | dev_res->res->end += get_res_add_size(realloc_head, | |
390 | dev_res->res); | |
3e6e0d80 YL |
391 | |
392 | /* Try updated head list with add_size added */ | |
3e6e0d80 YL |
393 | assign_requested_resources_sorted(head, &local_fail_head); |
394 | ||
395 | /* all assigned with add_size ? */ | |
bdc4abec | 396 | if (list_empty(&local_fail_head)) { |
3e6e0d80 | 397 | /* Remove head list from realloc_head list */ |
bdc4abec YL |
398 | list_for_each_entry(dev_res, head, list) |
399 | remove_from_list(realloc_head, dev_res->res); | |
bffc56d4 YL |
400 | free_list(&save_head); |
401 | free_list(head); | |
3e6e0d80 YL |
402 | return; |
403 | } | |
404 | ||
aa914f5e YL |
405 | /* check failed type */ |
406 | fail_type = pci_fail_res_type_mask(&local_fail_head); | |
407 | /* remove not need to be released assigned res from head list etc */ | |
408 | list_for_each_entry_safe(dev_res, tmp_res, head, list) | |
409 | if (dev_res->res->parent && | |
410 | !pci_need_to_release(fail_type, dev_res->res)) { | |
411 | /* remove it from realloc_head list */ | |
412 | remove_from_list(realloc_head, dev_res->res); | |
413 | remove_from_list(&save_head, dev_res->res); | |
414 | list_del(&dev_res->list); | |
415 | kfree(dev_res); | |
416 | } | |
417 | ||
bffc56d4 | 418 | free_list(&local_fail_head); |
3e6e0d80 | 419 | /* Release assigned resource */ |
bdc4abec YL |
420 | list_for_each_entry(dev_res, head, list) |
421 | if (dev_res->res->parent) | |
422 | release_resource(dev_res->res); | |
3e6e0d80 | 423 | /* Restore start/end/flags from saved list */ |
b9b0bba9 YL |
424 | list_for_each_entry(save_res, &save_head, list) { |
425 | struct resource *res = save_res->res; | |
3e6e0d80 | 426 | |
b9b0bba9 YL |
427 | res->start = save_res->start; |
428 | res->end = save_res->end; | |
429 | res->flags = save_res->flags; | |
3e6e0d80 | 430 | } |
bffc56d4 | 431 | free_list(&save_head); |
3e6e0d80 YL |
432 | |
433 | requested_and_reassign: | |
c8adf9a3 RP |
434 | /* Satisfy the must-have resource requests */ |
435 | assign_requested_resources_sorted(head, fail_head); | |
436 | ||
0a2daa1c | 437 | /* Try to satisfy any additional optional resource |
c8adf9a3 | 438 | requests */ |
9e8bf93a RP |
439 | if (realloc_head) |
440 | reassign_resources_sorted(realloc_head, head); | |
bffc56d4 | 441 | free_list(head); |
c8adf9a3 RP |
442 | } |
443 | ||
6841ec68 | 444 | static void pdev_assign_resources_sorted(struct pci_dev *dev, |
bdc4abec YL |
445 | struct list_head *add_head, |
446 | struct list_head *fail_head) | |
6841ec68 | 447 | { |
bdc4abec | 448 | LIST_HEAD(head); |
6841ec68 | 449 | |
6841ec68 | 450 | __dev_sort_resources(dev, &head); |
8424d759 | 451 | __assign_resources_sorted(&head, add_head, fail_head); |
6841ec68 YL |
452 | |
453 | } | |
454 | ||
455 | static void pbus_assign_resources_sorted(const struct pci_bus *bus, | |
bdc4abec YL |
456 | struct list_head *realloc_head, |
457 | struct list_head *fail_head) | |
6841ec68 YL |
458 | { |
459 | struct pci_dev *dev; | |
bdc4abec | 460 | LIST_HEAD(head); |
6841ec68 | 461 | |
6841ec68 YL |
462 | list_for_each_entry(dev, &bus->devices, bus_list) |
463 | __dev_sort_resources(dev, &head); | |
464 | ||
9e8bf93a | 465 | __assign_resources_sorted(&head, realloc_head, fail_head); |
6841ec68 YL |
466 | } |
467 | ||
b3743fa4 | 468 | void pci_setup_cardbus(struct pci_bus *bus) |
1da177e4 LT |
469 | { |
470 | struct pci_dev *bridge = bus->self; | |
c7dabef8 | 471 | struct resource *res; |
1da177e4 LT |
472 | struct pci_bus_region region; |
473 | ||
b918c62e YL |
474 | dev_info(&bridge->dev, "CardBus bridge to %pR\n", |
475 | &bus->busn_res); | |
1da177e4 | 476 | |
c7dabef8 | 477 | res = bus->resource[0]; |
fc279850 | 478 | pcibios_resource_to_bus(bridge->bus, ®ion, res); |
c7dabef8 | 479 | if (res->flags & IORESOURCE_IO) { |
1da177e4 LT |
480 | /* |
481 | * The IO resource is allocated a range twice as large as it | |
482 | * would normally need. This allows us to set both IO regs. | |
483 | */ | |
c7dabef8 | 484 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
1da177e4 LT |
485 | pci_write_config_dword(bridge, PCI_CB_IO_BASE_0, |
486 | region.start); | |
487 | pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0, | |
488 | region.end); | |
489 | } | |
490 | ||
c7dabef8 | 491 | res = bus->resource[1]; |
fc279850 | 492 | pcibios_resource_to_bus(bridge->bus, ®ion, res); |
c7dabef8 BH |
493 | if (res->flags & IORESOURCE_IO) { |
494 | dev_info(&bridge->dev, " bridge window %pR\n", res); | |
1da177e4 LT |
495 | pci_write_config_dword(bridge, PCI_CB_IO_BASE_1, |
496 | region.start); | |
497 | pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1, | |
498 | region.end); | |
499 | } | |
500 | ||
c7dabef8 | 501 | res = bus->resource[2]; |
fc279850 | 502 | pcibios_resource_to_bus(bridge->bus, ®ion, res); |
c7dabef8 BH |
503 | if (res->flags & IORESOURCE_MEM) { |
504 | dev_info(&bridge->dev, " bridge window %pR\n", res); | |
1da177e4 LT |
505 | pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0, |
506 | region.start); | |
507 | pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0, | |
508 | region.end); | |
509 | } | |
510 | ||
c7dabef8 | 511 | res = bus->resource[3]; |
fc279850 | 512 | pcibios_resource_to_bus(bridge->bus, ®ion, res); |
c7dabef8 BH |
513 | if (res->flags & IORESOURCE_MEM) { |
514 | dev_info(&bridge->dev, " bridge window %pR\n", res); | |
1da177e4 LT |
515 | pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1, |
516 | region.start); | |
517 | pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1, | |
518 | region.end); | |
519 | } | |
520 | } | |
b3743fa4 | 521 | EXPORT_SYMBOL(pci_setup_cardbus); |
1da177e4 LT |
522 | |
523 | /* Initialize bridges with base/limit values we have collected. | |
524 | PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998) | |
525 | requires that if there is no I/O ports or memory behind the | |
526 | bridge, corresponding range must be turned off by writing base | |
527 | value greater than limit to the bridge's base/limit registers. | |
528 | ||
529 | Note: care must be taken when updating I/O base/limit registers | |
530 | of bridges which support 32-bit I/O. This update requires two | |
531 | config space writes, so it's quite possible that an I/O window of | |
532 | the bridge will have some undesirable address (e.g. 0) after the | |
533 | first write. Ditto 64-bit prefetchable MMIO. */ | |
7cc5997d | 534 | static void pci_setup_bridge_io(struct pci_bus *bus) |
1da177e4 LT |
535 | { |
536 | struct pci_dev *bridge = bus->self; | |
c7dabef8 | 537 | struct resource *res; |
1da177e4 | 538 | struct pci_bus_region region; |
2b28ae19 BH |
539 | unsigned long io_mask; |
540 | u8 io_base_lo, io_limit_lo; | |
5b764b83 BH |
541 | u16 l; |
542 | u32 io_upper16; | |
1da177e4 | 543 | |
2b28ae19 BH |
544 | io_mask = PCI_IO_RANGE_MASK; |
545 | if (bridge->io_window_1k) | |
546 | io_mask = PCI_IO_1K_RANGE_MASK; | |
547 | ||
1da177e4 | 548 | /* Set up the top and bottom of the PCI I/O segment for this bus. */ |
c7dabef8 | 549 | res = bus->resource[0]; |
fc279850 | 550 | pcibios_resource_to_bus(bridge->bus, ®ion, res); |
c7dabef8 | 551 | if (res->flags & IORESOURCE_IO) { |
5b764b83 | 552 | pci_read_config_word(bridge, PCI_IO_BASE, &l); |
2b28ae19 BH |
553 | io_base_lo = (region.start >> 8) & io_mask; |
554 | io_limit_lo = (region.end >> 8) & io_mask; | |
5b764b83 | 555 | l = ((u16) io_limit_lo << 8) | io_base_lo; |
1da177e4 LT |
556 | /* Set up upper 16 bits of I/O base/limit. */ |
557 | io_upper16 = (region.end & 0xffff0000) | (region.start >> 16); | |
c7dabef8 | 558 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
7cc5997d | 559 | } else { |
1da177e4 LT |
560 | /* Clear upper 16 bits of I/O base/limit. */ |
561 | io_upper16 = 0; | |
562 | l = 0x00f0; | |
1da177e4 LT |
563 | } |
564 | /* Temporarily disable the I/O range before updating PCI_IO_BASE. */ | |
565 | pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff); | |
566 | /* Update lower 16 bits of I/O base/limit. */ | |
5b764b83 | 567 | pci_write_config_word(bridge, PCI_IO_BASE, l); |
1da177e4 LT |
568 | /* Update upper 16 bits of I/O base/limit. */ |
569 | pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16); | |
7cc5997d YL |
570 | } |
571 | ||
572 | static void pci_setup_bridge_mmio(struct pci_bus *bus) | |
573 | { | |
574 | struct pci_dev *bridge = bus->self; | |
575 | struct resource *res; | |
576 | struct pci_bus_region region; | |
577 | u32 l; | |
1da177e4 | 578 | |
7cc5997d | 579 | /* Set up the top and bottom of the PCI Memory segment for this bus. */ |
c7dabef8 | 580 | res = bus->resource[1]; |
fc279850 | 581 | pcibios_resource_to_bus(bridge->bus, ®ion, res); |
c7dabef8 | 582 | if (res->flags & IORESOURCE_MEM) { |
1da177e4 LT |
583 | l = (region.start >> 16) & 0xfff0; |
584 | l |= region.end & 0xfff00000; | |
c7dabef8 | 585 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
7cc5997d | 586 | } else { |
1da177e4 | 587 | l = 0x0000fff0; |
1da177e4 LT |
588 | } |
589 | pci_write_config_dword(bridge, PCI_MEMORY_BASE, l); | |
7cc5997d YL |
590 | } |
591 | ||
592 | static void pci_setup_bridge_mmio_pref(struct pci_bus *bus) | |
593 | { | |
594 | struct pci_dev *bridge = bus->self; | |
595 | struct resource *res; | |
596 | struct pci_bus_region region; | |
597 | u32 l, bu, lu; | |
1da177e4 LT |
598 | |
599 | /* Clear out the upper 32 bits of PREF limit. | |
600 | If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily | |
601 | disables PREF range, which is ok. */ | |
602 | pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0); | |
603 | ||
604 | /* Set up PREF base/limit. */ | |
c40a22e0 | 605 | bu = lu = 0; |
c7dabef8 | 606 | res = bus->resource[2]; |
fc279850 | 607 | pcibios_resource_to_bus(bridge->bus, ®ion, res); |
c7dabef8 | 608 | if (res->flags & IORESOURCE_PREFETCH) { |
1da177e4 LT |
609 | l = (region.start >> 16) & 0xfff0; |
610 | l |= region.end & 0xfff00000; | |
c7dabef8 | 611 | if (res->flags & IORESOURCE_MEM_64) { |
1f82de10 YL |
612 | bu = upper_32_bits(region.start); |
613 | lu = upper_32_bits(region.end); | |
1f82de10 | 614 | } |
c7dabef8 | 615 | dev_info(&bridge->dev, " bridge window %pR\n", res); |
7cc5997d | 616 | } else { |
1da177e4 | 617 | l = 0x0000fff0; |
1da177e4 LT |
618 | } |
619 | pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l); | |
620 | ||
59353ea3 AW |
621 | /* Set the upper 32 bits of PREF base & limit. */ |
622 | pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu); | |
623 | pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu); | |
7cc5997d YL |
624 | } |
625 | ||
626 | static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type) | |
627 | { | |
628 | struct pci_dev *bridge = bus->self; | |
629 | ||
b918c62e YL |
630 | dev_info(&bridge->dev, "PCI bridge to %pR\n", |
631 | &bus->busn_res); | |
7cc5997d YL |
632 | |
633 | if (type & IORESOURCE_IO) | |
634 | pci_setup_bridge_io(bus); | |
635 | ||
636 | if (type & IORESOURCE_MEM) | |
637 | pci_setup_bridge_mmio(bus); | |
638 | ||
639 | if (type & IORESOURCE_PREFETCH) | |
640 | pci_setup_bridge_mmio_pref(bus); | |
1da177e4 LT |
641 | |
642 | pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl); | |
643 | } | |
644 | ||
e2444273 | 645 | void pci_setup_bridge(struct pci_bus *bus) |
7cc5997d YL |
646 | { |
647 | unsigned long type = IORESOURCE_IO | IORESOURCE_MEM | | |
648 | IORESOURCE_PREFETCH; | |
649 | ||
650 | __pci_setup_bridge(bus, type); | |
651 | } | |
652 | ||
1da177e4 LT |
653 | /* Check whether the bridge supports optional I/O and |
654 | prefetchable memory ranges. If not, the respective | |
655 | base/limit registers must be read-only and read as 0. */ | |
96bde06a | 656 | static void pci_bridge_check_ranges(struct pci_bus *bus) |
1da177e4 LT |
657 | { |
658 | u16 io; | |
659 | u32 pmem; | |
660 | struct pci_dev *bridge = bus->self; | |
661 | struct resource *b_res; | |
662 | ||
663 | b_res = &bridge->resource[PCI_BRIDGE_RESOURCES]; | |
664 | b_res[1].flags |= IORESOURCE_MEM; | |
665 | ||
666 | pci_read_config_word(bridge, PCI_IO_BASE, &io); | |
667 | if (!io) { | |
d2f54d9b | 668 | pci_write_config_word(bridge, PCI_IO_BASE, 0xe0f0); |
1da177e4 | 669 | pci_read_config_word(bridge, PCI_IO_BASE, &io); |
f7625980 BH |
670 | pci_write_config_word(bridge, PCI_IO_BASE, 0x0); |
671 | } | |
672 | if (io) | |
1da177e4 | 673 | b_res[0].flags |= IORESOURCE_IO; |
d2f54d9b | 674 | |
1da177e4 LT |
675 | /* DECchip 21050 pass 2 errata: the bridge may miss an address |
676 | disconnect boundary by one PCI data phase. | |
677 | Workaround: do not use prefetching on this device. */ | |
678 | if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001) | |
679 | return; | |
d2f54d9b | 680 | |
1da177e4 LT |
681 | pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem); |
682 | if (!pmem) { | |
683 | pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, | |
d2f54d9b | 684 | 0xffe0fff0); |
1da177e4 LT |
685 | pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem); |
686 | pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0); | |
687 | } | |
1f82de10 | 688 | if (pmem) { |
1da177e4 | 689 | b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH; |
99586105 YL |
690 | if ((pmem & PCI_PREF_RANGE_TYPE_MASK) == |
691 | PCI_PREF_RANGE_TYPE_64) { | |
1f82de10 | 692 | b_res[2].flags |= IORESOURCE_MEM_64; |
99586105 YL |
693 | b_res[2].flags |= PCI_PREF_RANGE_TYPE_64; |
694 | } | |
1f82de10 YL |
695 | } |
696 | ||
697 | /* double check if bridge does support 64 bit pref */ | |
698 | if (b_res[2].flags & IORESOURCE_MEM_64) { | |
699 | u32 mem_base_hi, tmp; | |
700 | pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, | |
701 | &mem_base_hi); | |
702 | pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, | |
703 | 0xffffffff); | |
704 | pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp); | |
705 | if (!tmp) | |
706 | b_res[2].flags &= ~IORESOURCE_MEM_64; | |
707 | pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, | |
708 | mem_base_hi); | |
709 | } | |
1da177e4 LT |
710 | } |
711 | ||
712 | /* Helper function for sizing routines: find first available | |
713 | bus resource of a given type. Note: we intentionally skip | |
714 | the bus resources which have already been assigned (that is, | |
715 | have non-NULL parent resource). */ | |
5b285415 YL |
716 | static struct resource *find_free_bus_resource(struct pci_bus *bus, |
717 | unsigned long type_mask, unsigned long type) | |
1da177e4 LT |
718 | { |
719 | int i; | |
720 | struct resource *r; | |
1da177e4 | 721 | |
89a74ecc | 722 | pci_bus_for_each_resource(bus, r, i) { |
299de034 IK |
723 | if (r == &ioport_resource || r == &iomem_resource) |
724 | continue; | |
55a10984 JB |
725 | if (r && (r->flags & type_mask) == type && !r->parent) |
726 | return r; | |
1da177e4 LT |
727 | } |
728 | return NULL; | |
729 | } | |
730 | ||
13583b16 RP |
731 | static resource_size_t calculate_iosize(resource_size_t size, |
732 | resource_size_t min_size, | |
733 | resource_size_t size1, | |
734 | resource_size_t old_size, | |
735 | resource_size_t align) | |
736 | { | |
737 | if (size < min_size) | |
738 | size = min_size; | |
3c78bc61 | 739 | if (old_size == 1) |
13583b16 RP |
740 | old_size = 0; |
741 | /* To be fixed in 2.5: we should have sort of HAVE_ISA | |
742 | flag in the struct pci_bus. */ | |
743 | #if defined(CONFIG_ISA) || defined(CONFIG_EISA) | |
744 | size = (size & 0xff) + ((size & ~0xffUL) << 2); | |
745 | #endif | |
746 | size = ALIGN(size + size1, align); | |
747 | if (size < old_size) | |
748 | size = old_size; | |
749 | return size; | |
750 | } | |
751 | ||
752 | static resource_size_t calculate_memsize(resource_size_t size, | |
753 | resource_size_t min_size, | |
754 | resource_size_t size1, | |
755 | resource_size_t old_size, | |
756 | resource_size_t align) | |
757 | { | |
758 | if (size < min_size) | |
759 | size = min_size; | |
3c78bc61 | 760 | if (old_size == 1) |
13583b16 RP |
761 | old_size = 0; |
762 | if (size < old_size) | |
763 | size = old_size; | |
764 | size = ALIGN(size + size1, align); | |
765 | return size; | |
766 | } | |
767 | ||
ac5ad93e GS |
768 | resource_size_t __weak pcibios_window_alignment(struct pci_bus *bus, |
769 | unsigned long type) | |
770 | { | |
771 | return 1; | |
772 | } | |
773 | ||
774 | #define PCI_P2P_DEFAULT_MEM_ALIGN 0x100000 /* 1MiB */ | |
775 | #define PCI_P2P_DEFAULT_IO_ALIGN 0x1000 /* 4KiB */ | |
776 | #define PCI_P2P_DEFAULT_IO_ALIGN_1K 0x400 /* 1KiB */ | |
777 | ||
778 | static resource_size_t window_alignment(struct pci_bus *bus, | |
779 | unsigned long type) | |
780 | { | |
781 | resource_size_t align = 1, arch_align; | |
782 | ||
783 | if (type & IORESOURCE_MEM) | |
784 | align = PCI_P2P_DEFAULT_MEM_ALIGN; | |
785 | else if (type & IORESOURCE_IO) { | |
786 | /* | |
787 | * Per spec, I/O windows are 4K-aligned, but some | |
788 | * bridges have an extension to support 1K alignment. | |
789 | */ | |
790 | if (bus->self->io_window_1k) | |
791 | align = PCI_P2P_DEFAULT_IO_ALIGN_1K; | |
792 | else | |
793 | align = PCI_P2P_DEFAULT_IO_ALIGN; | |
794 | } | |
795 | ||
796 | arch_align = pcibios_window_alignment(bus, type); | |
797 | return max(align, arch_align); | |
798 | } | |
799 | ||
c8adf9a3 RP |
800 | /** |
801 | * pbus_size_io() - size the io window of a given bus | |
802 | * | |
803 | * @bus : the bus | |
804 | * @min_size : the minimum io window that must to be allocated | |
805 | * @add_size : additional optional io window | |
9e8bf93a | 806 | * @realloc_head : track the additional io window on this list |
c8adf9a3 RP |
807 | * |
808 | * Sizing the IO windows of the PCI-PCI bridge is trivial, | |
fd591341 | 809 | * since these windows have 1K or 4K granularity and the IO ranges |
c8adf9a3 RP |
810 | * of non-bridge PCI devices are limited to 256 bytes. |
811 | * We must be careful with the ISA aliasing though. | |
812 | */ | |
813 | static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, | |
bdc4abec | 814 | resource_size_t add_size, struct list_head *realloc_head) |
1da177e4 LT |
815 | { |
816 | struct pci_dev *dev; | |
5b285415 YL |
817 | struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO, |
818 | IORESOURCE_IO); | |
11251a86 | 819 | resource_size_t size = 0, size0 = 0, size1 = 0; |
be768912 | 820 | resource_size_t children_add_size = 0; |
2d1d6678 | 821 | resource_size_t min_align, align; |
1da177e4 LT |
822 | |
823 | if (!b_res) | |
f7625980 | 824 | return; |
1da177e4 | 825 | |
2d1d6678 | 826 | min_align = window_alignment(bus, IORESOURCE_IO); |
1da177e4 LT |
827 | list_for_each_entry(dev, &bus->devices, bus_list) { |
828 | int i; | |
829 | ||
830 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
831 | struct resource *r = &dev->resource[i]; | |
832 | unsigned long r_size; | |
833 | ||
834 | if (r->parent || !(r->flags & IORESOURCE_IO)) | |
835 | continue; | |
022edd86 | 836 | r_size = resource_size(r); |
1da177e4 LT |
837 | |
838 | if (r_size < 0x400) | |
839 | /* Might be re-aligned for ISA */ | |
840 | size += r_size; | |
841 | else | |
842 | size1 += r_size; | |
be768912 | 843 | |
fd591341 YL |
844 | align = pci_resource_alignment(dev, r); |
845 | if (align > min_align) | |
846 | min_align = align; | |
847 | ||
9e8bf93a RP |
848 | if (realloc_head) |
849 | children_add_size += get_res_add_size(realloc_head, r); | |
1da177e4 LT |
850 | } |
851 | } | |
fd591341 | 852 | |
c8adf9a3 | 853 | size0 = calculate_iosize(size, min_size, size1, |
fd591341 | 854 | resource_size(b_res), min_align); |
be768912 YL |
855 | if (children_add_size > add_size) |
856 | add_size = children_add_size; | |
9e8bf93a | 857 | size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 : |
a4ac9fea | 858 | calculate_iosize(size, min_size, add_size + size1, |
fd591341 | 859 | resource_size(b_res), min_align); |
c8adf9a3 | 860 | if (!size0 && !size1) { |
865df576 BH |
861 | if (b_res->start || b_res->end) |
862 | dev_info(&bus->self->dev, "disabling bridge window " | |
b918c62e YL |
863 | "%pR to %pR (unused)\n", b_res, |
864 | &bus->busn_res); | |
1da177e4 LT |
865 | b_res->flags = 0; |
866 | return; | |
867 | } | |
fd591341 YL |
868 | |
869 | b_res->start = min_align; | |
c8adf9a3 | 870 | b_res->end = b_res->start + size0 - 1; |
88452565 | 871 | b_res->flags |= IORESOURCE_STARTALIGN; |
b592443d | 872 | if (size1 > size0 && realloc_head) { |
fd591341 YL |
873 | add_to_list(realloc_head, bus->self, b_res, size1-size0, |
874 | min_align); | |
b592443d | 875 | dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window " |
11251a86 WY |
876 | "%pR to %pR add_size %llx\n", b_res, |
877 | &bus->busn_res, | |
878 | (unsigned long long)size1-size0); | |
b592443d | 879 | } |
1da177e4 LT |
880 | } |
881 | ||
c121504e GS |
882 | static inline resource_size_t calculate_mem_align(resource_size_t *aligns, |
883 | int max_order) | |
884 | { | |
885 | resource_size_t align = 0; | |
886 | resource_size_t min_align = 0; | |
887 | int order; | |
888 | ||
889 | for (order = 0; order <= max_order; order++) { | |
890 | resource_size_t align1 = 1; | |
891 | ||
892 | align1 <<= (order + 20); | |
893 | ||
894 | if (!align) | |
895 | min_align = align1; | |
896 | else if (ALIGN(align + min_align, min_align) < align1) | |
897 | min_align = align1 >> 1; | |
898 | align += aligns[order]; | |
899 | } | |
900 | ||
901 | return min_align; | |
902 | } | |
903 | ||
c8adf9a3 RP |
904 | /** |
905 | * pbus_size_mem() - size the memory window of a given bus | |
906 | * | |
907 | * @bus : the bus | |
496f70cf WY |
908 | * @mask: mask the resource flag, then compare it with type |
909 | * @type: the type of free resource from bridge | |
5b285415 YL |
910 | * @type2: second match type |
911 | * @type3: third match type | |
c8adf9a3 RP |
912 | * @min_size : the minimum memory window that must to be allocated |
913 | * @add_size : additional optional memory window | |
9e8bf93a | 914 | * @realloc_head : track the additional memory window on this list |
c8adf9a3 RP |
915 | * |
916 | * Calculate the size of the bus and minimal alignment which | |
917 | * guarantees that all child resources fit in this size. | |
30afe8d0 BH |
918 | * |
919 | * Returns -ENOSPC if there's no available bus resource of the desired type. | |
920 | * Otherwise, sets the bus resource start/end to indicate the required | |
921 | * size, adds things to realloc_head (if supplied), and returns 0. | |
c8adf9a3 | 922 | */ |
28760489 | 923 | static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, |
5b285415 YL |
924 | unsigned long type, unsigned long type2, |
925 | unsigned long type3, | |
926 | resource_size_t min_size, resource_size_t add_size, | |
927 | struct list_head *realloc_head) | |
1da177e4 LT |
928 | { |
929 | struct pci_dev *dev; | |
c8adf9a3 | 930 | resource_size_t min_align, align, size, size0, size1; |
14c8530d | 931 | resource_size_t aligns[14]; /* Alignments from 1Mb to 8Gb */ |
1da177e4 | 932 | int order, max_order; |
5b285415 YL |
933 | struct resource *b_res = find_free_bus_resource(bus, |
934 | mask | IORESOURCE_PREFETCH, type); | |
be768912 | 935 | resource_size_t children_add_size = 0; |
1da177e4 LT |
936 | |
937 | if (!b_res) | |
30afe8d0 | 938 | return -ENOSPC; |
1da177e4 LT |
939 | |
940 | memset(aligns, 0, sizeof(aligns)); | |
941 | max_order = 0; | |
942 | size = 0; | |
943 | ||
944 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
945 | int i; | |
1f82de10 | 946 | |
1da177e4 LT |
947 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
948 | struct resource *r = &dev->resource[i]; | |
c40a22e0 | 949 | resource_size_t r_size; |
1da177e4 | 950 | |
5b285415 YL |
951 | if (r->parent || ((r->flags & mask) != type && |
952 | (r->flags & mask) != type2 && | |
953 | (r->flags & mask) != type3)) | |
1da177e4 | 954 | continue; |
022edd86 | 955 | r_size = resource_size(r); |
2aceefcb YL |
956 | #ifdef CONFIG_PCI_IOV |
957 | /* put SRIOV requested res to the optional list */ | |
9e8bf93a | 958 | if (realloc_head && i >= PCI_IOV_RESOURCES && |
2aceefcb YL |
959 | i <= PCI_IOV_RESOURCE_END) { |
960 | r->end = r->start - 1; | |
f7625980 | 961 | add_to_list(realloc_head, dev, r, r_size, 0/* don't care */); |
2aceefcb YL |
962 | children_add_size += r_size; |
963 | continue; | |
964 | } | |
965 | #endif | |
14c8530d A |
966 | /* |
967 | * aligns[0] is for 1MB (since bridge memory | |
968 | * windows are always at least 1MB aligned), so | |
969 | * keep "order" from being negative for smaller | |
970 | * resources. | |
971 | */ | |
6faf17f6 | 972 | align = pci_resource_alignment(dev, r); |
1da177e4 | 973 | order = __ffs(align) - 20; |
14c8530d A |
974 | if (order < 0) |
975 | order = 0; | |
976 | if (order >= ARRAY_SIZE(aligns)) { | |
865df576 BH |
977 | dev_warn(&dev->dev, "disabling BAR %d: %pR " |
978 | "(bad alignment %#llx)\n", i, r, | |
979 | (unsigned long long) align); | |
1da177e4 LT |
980 | r->flags = 0; |
981 | continue; | |
982 | } | |
983 | size += r_size; | |
1da177e4 LT |
984 | /* Exclude ranges with size > align from |
985 | calculation of the alignment. */ | |
986 | if (r_size == align) | |
987 | aligns[order] += align; | |
988 | if (order > max_order) | |
989 | max_order = order; | |
be768912 | 990 | |
9e8bf93a RP |
991 | if (realloc_head) |
992 | children_add_size += get_res_add_size(realloc_head, r); | |
1da177e4 LT |
993 | } |
994 | } | |
462d9303 | 995 | |
c121504e | 996 | min_align = calculate_mem_align(aligns, max_order); |
3ad94b0d | 997 | min_align = max(min_align, window_alignment(bus, b_res->flags)); |
b42282e5 | 998 | size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align); |
be768912 YL |
999 | if (children_add_size > add_size) |
1000 | add_size = children_add_size; | |
9e8bf93a | 1001 | size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 : |
a4ac9fea | 1002 | calculate_memsize(size, min_size, add_size, |
b42282e5 | 1003 | resource_size(b_res), min_align); |
c8adf9a3 | 1004 | if (!size0 && !size1) { |
865df576 BH |
1005 | if (b_res->start || b_res->end) |
1006 | dev_info(&bus->self->dev, "disabling bridge window " | |
b918c62e YL |
1007 | "%pR to %pR (unused)\n", b_res, |
1008 | &bus->busn_res); | |
1da177e4 | 1009 | b_res->flags = 0; |
30afe8d0 | 1010 | return 0; |
1da177e4 LT |
1011 | } |
1012 | b_res->start = min_align; | |
c8adf9a3 | 1013 | b_res->end = size0 + min_align - 1; |
5b285415 | 1014 | b_res->flags |= IORESOURCE_STARTALIGN; |
b592443d | 1015 | if (size1 > size0 && realloc_head) { |
9e8bf93a | 1016 | add_to_list(realloc_head, bus->self, b_res, size1-size0, min_align); |
b592443d | 1017 | dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window " |
b918c62e YL |
1018 | "%pR to %pR add_size %llx\n", b_res, |
1019 | &bus->busn_res, (unsigned long long)size1-size0); | |
b592443d | 1020 | } |
30afe8d0 | 1021 | return 0; |
1da177e4 LT |
1022 | } |
1023 | ||
0a2daa1c RP |
1024 | unsigned long pci_cardbus_resource_alignment(struct resource *res) |
1025 | { | |
1026 | if (res->flags & IORESOURCE_IO) | |
1027 | return pci_cardbus_io_size; | |
1028 | if (res->flags & IORESOURCE_MEM) | |
1029 | return pci_cardbus_mem_size; | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | static void pci_bus_size_cardbus(struct pci_bus *bus, | |
bdc4abec | 1034 | struct list_head *realloc_head) |
1da177e4 LT |
1035 | { |
1036 | struct pci_dev *bridge = bus->self; | |
1037 | struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES]; | |
11848934 | 1038 | resource_size_t b_res_3_size = pci_cardbus_mem_size * 2; |
1da177e4 LT |
1039 | u16 ctrl; |
1040 | ||
3796f1e2 YL |
1041 | if (b_res[0].parent) |
1042 | goto handle_b_res_1; | |
1da177e4 LT |
1043 | /* |
1044 | * Reserve some resources for CardBus. We reserve | |
1045 | * a fixed amount of bus space for CardBus bridges. | |
1046 | */ | |
11848934 YL |
1047 | b_res[0].start = pci_cardbus_io_size; |
1048 | b_res[0].end = b_res[0].start + pci_cardbus_io_size - 1; | |
1049 | b_res[0].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN; | |
1050 | if (realloc_head) { | |
1051 | b_res[0].end -= pci_cardbus_io_size; | |
1052 | add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size, | |
1053 | pci_cardbus_io_size); | |
1054 | } | |
1da177e4 | 1055 | |
3796f1e2 YL |
1056 | handle_b_res_1: |
1057 | if (b_res[1].parent) | |
1058 | goto handle_b_res_2; | |
11848934 YL |
1059 | b_res[1].start = pci_cardbus_io_size; |
1060 | b_res[1].end = b_res[1].start + pci_cardbus_io_size - 1; | |
1061 | b_res[1].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN; | |
1062 | if (realloc_head) { | |
1063 | b_res[1].end -= pci_cardbus_io_size; | |
1064 | add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size, | |
1065 | pci_cardbus_io_size); | |
1066 | } | |
1da177e4 | 1067 | |
3796f1e2 | 1068 | handle_b_res_2: |
dcef0d06 YL |
1069 | /* MEM1 must not be pref mmio */ |
1070 | pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); | |
1071 | if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM1) { | |
1072 | ctrl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1; | |
1073 | pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl); | |
1074 | pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); | |
1075 | } | |
1076 | ||
1da177e4 LT |
1077 | /* |
1078 | * Check whether prefetchable memory is supported | |
1079 | * by this bridge. | |
1080 | */ | |
1081 | pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); | |
1082 | if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) { | |
1083 | ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0; | |
1084 | pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl); | |
1085 | pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl); | |
1086 | } | |
1087 | ||
3796f1e2 YL |
1088 | if (b_res[2].parent) |
1089 | goto handle_b_res_3; | |
1da177e4 LT |
1090 | /* |
1091 | * If we have prefetchable memory support, allocate | |
1092 | * two regions. Otherwise, allocate one region of | |
1093 | * twice the size. | |
1094 | */ | |
1095 | if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) { | |
11848934 YL |
1096 | b_res[2].start = pci_cardbus_mem_size; |
1097 | b_res[2].end = b_res[2].start + pci_cardbus_mem_size - 1; | |
1098 | b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | | |
1099 | IORESOURCE_STARTALIGN; | |
1100 | if (realloc_head) { | |
1101 | b_res[2].end -= pci_cardbus_mem_size; | |
1102 | add_to_list(realloc_head, bridge, b_res+2, | |
1103 | pci_cardbus_mem_size, pci_cardbus_mem_size); | |
1104 | } | |
1105 | ||
1106 | /* reduce that to half */ | |
1107 | b_res_3_size = pci_cardbus_mem_size; | |
1108 | } | |
1109 | ||
3796f1e2 YL |
1110 | handle_b_res_3: |
1111 | if (b_res[3].parent) | |
1112 | goto handle_done; | |
11848934 YL |
1113 | b_res[3].start = pci_cardbus_mem_size; |
1114 | b_res[3].end = b_res[3].start + b_res_3_size - 1; | |
1115 | b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN; | |
1116 | if (realloc_head) { | |
1117 | b_res[3].end -= b_res_3_size; | |
1118 | add_to_list(realloc_head, bridge, b_res+3, b_res_3_size, | |
1119 | pci_cardbus_mem_size); | |
1120 | } | |
3796f1e2 YL |
1121 | |
1122 | handle_done: | |
1123 | ; | |
1da177e4 LT |
1124 | } |
1125 | ||
10874f5a | 1126 | void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) |
1da177e4 LT |
1127 | { |
1128 | struct pci_dev *dev; | |
5b285415 | 1129 | unsigned long mask, prefmask, type2 = 0, type3 = 0; |
c8adf9a3 | 1130 | resource_size_t additional_mem_size = 0, additional_io_size = 0; |
5b285415 | 1131 | struct resource *b_res; |
30afe8d0 | 1132 | int ret; |
1da177e4 LT |
1133 | |
1134 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1135 | struct pci_bus *b = dev->subordinate; | |
1136 | if (!b) | |
1137 | continue; | |
1138 | ||
1139 | switch (dev->class >> 8) { | |
1140 | case PCI_CLASS_BRIDGE_CARDBUS: | |
9e8bf93a | 1141 | pci_bus_size_cardbus(b, realloc_head); |
1da177e4 LT |
1142 | break; |
1143 | ||
1144 | case PCI_CLASS_BRIDGE_PCI: | |
1145 | default: | |
9e8bf93a | 1146 | __pci_bus_size_bridges(b, realloc_head); |
1da177e4 LT |
1147 | break; |
1148 | } | |
1149 | } | |
1150 | ||
1151 | /* The root bus? */ | |
2ba29e27 | 1152 | if (pci_is_root_bus(bus)) |
1da177e4 LT |
1153 | return; |
1154 | ||
1155 | switch (bus->self->class >> 8) { | |
1156 | case PCI_CLASS_BRIDGE_CARDBUS: | |
1157 | /* don't size cardbuses yet. */ | |
1158 | break; | |
1159 | ||
1160 | case PCI_CLASS_BRIDGE_PCI: | |
1161 | pci_bridge_check_ranges(bus); | |
28760489 | 1162 | if (bus->self->is_hotplug_bridge) { |
c8adf9a3 RP |
1163 | additional_io_size = pci_hotplug_io_size; |
1164 | additional_mem_size = pci_hotplug_mem_size; | |
28760489 | 1165 | } |
67d29b5c | 1166 | /* Fall through */ |
1da177e4 | 1167 | default: |
19aa7ee4 YL |
1168 | pbus_size_io(bus, realloc_head ? 0 : additional_io_size, |
1169 | additional_io_size, realloc_head); | |
67d29b5c BH |
1170 | |
1171 | /* | |
1172 | * If there's a 64-bit prefetchable MMIO window, compute | |
1173 | * the size required to put all 64-bit prefetchable | |
1174 | * resources in it. | |
1175 | */ | |
5b285415 | 1176 | b_res = &bus->self->resource[PCI_BRIDGE_RESOURCES]; |
1da177e4 LT |
1177 | mask = IORESOURCE_MEM; |
1178 | prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
5b285415 YL |
1179 | if (b_res[2].flags & IORESOURCE_MEM_64) { |
1180 | prefmask |= IORESOURCE_MEM_64; | |
30afe8d0 | 1181 | ret = pbus_size_mem(bus, prefmask, prefmask, |
5b285415 | 1182 | prefmask, prefmask, |
19aa7ee4 | 1183 | realloc_head ? 0 : additional_mem_size, |
30afe8d0 | 1184 | additional_mem_size, realloc_head); |
67d29b5c BH |
1185 | |
1186 | /* | |
1187 | * If successful, all non-prefetchable resources | |
1188 | * and any 32-bit prefetchable resources will go in | |
1189 | * the non-prefetchable window. | |
1190 | */ | |
30afe8d0 | 1191 | if (ret == 0) { |
30afe8d0 BH |
1192 | mask = prefmask; |
1193 | type2 = prefmask & ~IORESOURCE_MEM_64; | |
1194 | type3 = prefmask & ~IORESOURCE_PREFETCH; | |
5b285415 YL |
1195 | } |
1196 | } | |
67d29b5c BH |
1197 | |
1198 | /* | |
1199 | * If there is no 64-bit prefetchable window, compute the | |
1200 | * size required to put all prefetchable resources in the | |
1201 | * 32-bit prefetchable window (if there is one). | |
1202 | */ | |
5b285415 YL |
1203 | if (!type2) { |
1204 | prefmask &= ~IORESOURCE_MEM_64; | |
30afe8d0 | 1205 | ret = pbus_size_mem(bus, prefmask, prefmask, |
5b285415 YL |
1206 | prefmask, prefmask, |
1207 | realloc_head ? 0 : additional_mem_size, | |
30afe8d0 | 1208 | additional_mem_size, realloc_head); |
67d29b5c BH |
1209 | |
1210 | /* | |
1211 | * If successful, only non-prefetchable resources | |
1212 | * will go in the non-prefetchable window. | |
1213 | */ | |
1214 | if (ret == 0) | |
5b285415 | 1215 | mask = prefmask; |
67d29b5c | 1216 | else |
5b285415 | 1217 | additional_mem_size += additional_mem_size; |
67d29b5c | 1218 | |
5b285415 YL |
1219 | type2 = type3 = IORESOURCE_MEM; |
1220 | } | |
67d29b5c BH |
1221 | |
1222 | /* | |
1223 | * Compute the size required to put everything else in the | |
1224 | * non-prefetchable window. This includes: | |
1225 | * | |
1226 | * - all non-prefetchable resources | |
1227 | * - 32-bit prefetchable resources if there's a 64-bit | |
1228 | * prefetchable window or no prefetchable window at all | |
1229 | * - 64-bit prefetchable resources if there's no | |
1230 | * prefetchable window at all | |
1231 | * | |
1232 | * Note that the strategy in __pci_assign_resource() must | |
1233 | * match that used here. Specifically, we cannot put a | |
1234 | * 32-bit prefetchable resource in a 64-bit prefetchable | |
1235 | * window. | |
1236 | */ | |
5b285415 | 1237 | pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3, |
19aa7ee4 YL |
1238 | realloc_head ? 0 : additional_mem_size, |
1239 | additional_mem_size, realloc_head); | |
1da177e4 LT |
1240 | break; |
1241 | } | |
1242 | } | |
c8adf9a3 | 1243 | |
10874f5a | 1244 | void pci_bus_size_bridges(struct pci_bus *bus) |
c8adf9a3 RP |
1245 | { |
1246 | __pci_bus_size_bridges(bus, NULL); | |
1247 | } | |
1da177e4 LT |
1248 | EXPORT_SYMBOL(pci_bus_size_bridges); |
1249 | ||
10874f5a BH |
1250 | void __pci_bus_assign_resources(const struct pci_bus *bus, |
1251 | struct list_head *realloc_head, | |
1252 | struct list_head *fail_head) | |
1da177e4 LT |
1253 | { |
1254 | struct pci_bus *b; | |
1255 | struct pci_dev *dev; | |
1256 | ||
9e8bf93a | 1257 | pbus_assign_resources_sorted(bus, realloc_head, fail_head); |
1da177e4 | 1258 | |
1da177e4 LT |
1259 | list_for_each_entry(dev, &bus->devices, bus_list) { |
1260 | b = dev->subordinate; | |
1261 | if (!b) | |
1262 | continue; | |
1263 | ||
9e8bf93a | 1264 | __pci_bus_assign_resources(b, realloc_head, fail_head); |
1da177e4 LT |
1265 | |
1266 | switch (dev->class >> 8) { | |
1267 | case PCI_CLASS_BRIDGE_PCI: | |
6841ec68 YL |
1268 | if (!pci_is_enabled(dev)) |
1269 | pci_setup_bridge(b); | |
1da177e4 LT |
1270 | break; |
1271 | ||
1272 | case PCI_CLASS_BRIDGE_CARDBUS: | |
1273 | pci_setup_cardbus(b); | |
1274 | break; | |
1275 | ||
1276 | default: | |
80ccba11 BH |
1277 | dev_info(&dev->dev, "not setting up bridge for bus " |
1278 | "%04x:%02x\n", pci_domain_nr(b), b->number); | |
1da177e4 LT |
1279 | break; |
1280 | } | |
1281 | } | |
1282 | } | |
568ddef8 | 1283 | |
10874f5a | 1284 | void pci_bus_assign_resources(const struct pci_bus *bus) |
568ddef8 | 1285 | { |
c8adf9a3 | 1286 | __pci_bus_assign_resources(bus, NULL, NULL); |
568ddef8 | 1287 | } |
1da177e4 LT |
1288 | EXPORT_SYMBOL(pci_bus_assign_resources); |
1289 | ||
10874f5a BH |
1290 | static void __pci_bridge_assign_resources(const struct pci_dev *bridge, |
1291 | struct list_head *add_head, | |
1292 | struct list_head *fail_head) | |
6841ec68 YL |
1293 | { |
1294 | struct pci_bus *b; | |
1295 | ||
8424d759 YL |
1296 | pdev_assign_resources_sorted((struct pci_dev *)bridge, |
1297 | add_head, fail_head); | |
6841ec68 YL |
1298 | |
1299 | b = bridge->subordinate; | |
1300 | if (!b) | |
1301 | return; | |
1302 | ||
8424d759 | 1303 | __pci_bus_assign_resources(b, add_head, fail_head); |
6841ec68 YL |
1304 | |
1305 | switch (bridge->class >> 8) { | |
1306 | case PCI_CLASS_BRIDGE_PCI: | |
1307 | pci_setup_bridge(b); | |
1308 | break; | |
1309 | ||
1310 | case PCI_CLASS_BRIDGE_CARDBUS: | |
1311 | pci_setup_cardbus(b); | |
1312 | break; | |
1313 | ||
1314 | default: | |
1315 | dev_info(&bridge->dev, "not setting up bridge for bus " | |
1316 | "%04x:%02x\n", pci_domain_nr(b), b->number); | |
1317 | break; | |
1318 | } | |
1319 | } | |
5009b460 YL |
1320 | static void pci_bridge_release_resources(struct pci_bus *bus, |
1321 | unsigned long type) | |
1322 | { | |
5b285415 | 1323 | struct pci_dev *dev = bus->self; |
5009b460 YL |
1324 | struct resource *r; |
1325 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | | |
5b285415 YL |
1326 | IORESOURCE_PREFETCH | IORESOURCE_MEM_64; |
1327 | unsigned old_flags = 0; | |
1328 | struct resource *b_res; | |
1329 | int idx = 1; | |
5009b460 | 1330 | |
5b285415 YL |
1331 | b_res = &dev->resource[PCI_BRIDGE_RESOURCES]; |
1332 | ||
1333 | /* | |
1334 | * 1. if there is io port assign fail, will release bridge | |
1335 | * io port. | |
1336 | * 2. if there is non pref mmio assign fail, release bridge | |
1337 | * nonpref mmio. | |
1338 | * 3. if there is 64bit pref mmio assign fail, and bridge pref | |
1339 | * is 64bit, release bridge pref mmio. | |
1340 | * 4. if there is pref mmio assign fail, and bridge pref is | |
1341 | * 32bit mmio, release bridge pref mmio | |
1342 | * 5. if there is pref mmio assign fail, and bridge pref is not | |
1343 | * assigned, release bridge nonpref mmio. | |
1344 | */ | |
1345 | if (type & IORESOURCE_IO) | |
1346 | idx = 0; | |
1347 | else if (!(type & IORESOURCE_PREFETCH)) | |
1348 | idx = 1; | |
1349 | else if ((type & IORESOURCE_MEM_64) && | |
1350 | (b_res[2].flags & IORESOURCE_MEM_64)) | |
1351 | idx = 2; | |
1352 | else if (!(b_res[2].flags & IORESOURCE_MEM_64) && | |
1353 | (b_res[2].flags & IORESOURCE_PREFETCH)) | |
1354 | idx = 2; | |
1355 | else | |
1356 | idx = 1; | |
1357 | ||
1358 | r = &b_res[idx]; | |
1359 | ||
1360 | if (!r->parent) | |
1361 | return; | |
1362 | ||
1363 | /* | |
1364 | * if there are children under that, we should release them | |
1365 | * all | |
1366 | */ | |
1367 | release_child_resources(r); | |
1368 | if (!release_resource(r)) { | |
1369 | type = old_flags = r->flags & type_mask; | |
1370 | dev_printk(KERN_DEBUG, &dev->dev, "resource %d %pR released\n", | |
1371 | PCI_BRIDGE_RESOURCES + idx, r); | |
1372 | /* keep the old size */ | |
1373 | r->end = resource_size(r) - 1; | |
1374 | r->start = 0; | |
1375 | r->flags = 0; | |
5009b460 | 1376 | |
5009b460 YL |
1377 | /* avoiding touch the one without PREF */ |
1378 | if (type & IORESOURCE_PREFETCH) | |
1379 | type = IORESOURCE_PREFETCH; | |
1380 | __pci_setup_bridge(bus, type); | |
5b285415 YL |
1381 | /* for next child res under same bridge */ |
1382 | r->flags = old_flags; | |
5009b460 YL |
1383 | } |
1384 | } | |
1385 | ||
1386 | enum release_type { | |
1387 | leaf_only, | |
1388 | whole_subtree, | |
1389 | }; | |
1390 | /* | |
1391 | * try to release pci bridge resources that is from leaf bridge, | |
1392 | * so we can allocate big new one later | |
1393 | */ | |
10874f5a BH |
1394 | static void pci_bus_release_bridge_resources(struct pci_bus *bus, |
1395 | unsigned long type, | |
1396 | enum release_type rel_type) | |
5009b460 YL |
1397 | { |
1398 | struct pci_dev *dev; | |
1399 | bool is_leaf_bridge = true; | |
1400 | ||
1401 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1402 | struct pci_bus *b = dev->subordinate; | |
1403 | if (!b) | |
1404 | continue; | |
1405 | ||
1406 | is_leaf_bridge = false; | |
1407 | ||
1408 | if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI) | |
1409 | continue; | |
1410 | ||
1411 | if (rel_type == whole_subtree) | |
1412 | pci_bus_release_bridge_resources(b, type, | |
1413 | whole_subtree); | |
1414 | } | |
1415 | ||
1416 | if (pci_is_root_bus(bus)) | |
1417 | return; | |
1418 | ||
1419 | if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI) | |
1420 | return; | |
1421 | ||
1422 | if ((rel_type == whole_subtree) || is_leaf_bridge) | |
1423 | pci_bridge_release_resources(bus, type); | |
1424 | } | |
1425 | ||
76fbc263 YL |
1426 | static void pci_bus_dump_res(struct pci_bus *bus) |
1427 | { | |
89a74ecc BH |
1428 | struct resource *res; |
1429 | int i; | |
7c9342b8 | 1430 | |
89a74ecc | 1431 | pci_bus_for_each_resource(bus, res, i) { |
7c9342b8 | 1432 | if (!res || !res->end || !res->flags) |
3c78bc61 | 1433 | continue; |
76fbc263 | 1434 | |
c7dabef8 | 1435 | dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res); |
3c78bc61 | 1436 | } |
76fbc263 YL |
1437 | } |
1438 | ||
1439 | static void pci_bus_dump_resources(struct pci_bus *bus) | |
1440 | { | |
1441 | struct pci_bus *b; | |
1442 | struct pci_dev *dev; | |
1443 | ||
1444 | ||
1445 | pci_bus_dump_res(bus); | |
1446 | ||
1447 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1448 | b = dev->subordinate; | |
1449 | if (!b) | |
1450 | continue; | |
1451 | ||
1452 | pci_bus_dump_resources(b); | |
1453 | } | |
1454 | } | |
1455 | ||
ff35147c | 1456 | static int pci_bus_get_depth(struct pci_bus *bus) |
da7822e5 YL |
1457 | { |
1458 | int depth = 0; | |
f2a230bd | 1459 | struct pci_bus *child_bus; |
da7822e5 | 1460 | |
3c78bc61 | 1461 | list_for_each_entry(child_bus, &bus->children, node) { |
da7822e5 | 1462 | int ret; |
da7822e5 | 1463 | |
f2a230bd | 1464 | ret = pci_bus_get_depth(child_bus); |
da7822e5 YL |
1465 | if (ret + 1 > depth) |
1466 | depth = ret + 1; | |
1467 | } | |
1468 | ||
1469 | return depth; | |
1470 | } | |
da7822e5 | 1471 | |
b55438fd YL |
1472 | /* |
1473 | * -1: undefined, will auto detect later | |
1474 | * 0: disabled by user | |
1475 | * 1: disabled by auto detect | |
1476 | * 2: enabled by user | |
1477 | * 3: enabled by auto detect | |
1478 | */ | |
1479 | enum enable_type { | |
1480 | undefined = -1, | |
1481 | user_disabled, | |
1482 | auto_disabled, | |
1483 | user_enabled, | |
1484 | auto_enabled, | |
1485 | }; | |
1486 | ||
ff35147c | 1487 | static enum enable_type pci_realloc_enable = undefined; |
b55438fd YL |
1488 | void __init pci_realloc_get_opt(char *str) |
1489 | { | |
1490 | if (!strncmp(str, "off", 3)) | |
1491 | pci_realloc_enable = user_disabled; | |
1492 | else if (!strncmp(str, "on", 2)) | |
1493 | pci_realloc_enable = user_enabled; | |
1494 | } | |
ff35147c | 1495 | static bool pci_realloc_enabled(enum enable_type enable) |
b55438fd | 1496 | { |
967260cd | 1497 | return enable >= user_enabled; |
b55438fd | 1498 | } |
f483d392 | 1499 | |
b07f2ebc | 1500 | #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO) |
ff35147c | 1501 | static int iov_resources_unassigned(struct pci_dev *dev, void *data) |
223d96fc YL |
1502 | { |
1503 | int i; | |
1504 | bool *unassigned = data; | |
b07f2ebc | 1505 | |
223d96fc YL |
1506 | for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) { |
1507 | struct resource *r = &dev->resource[i]; | |
fa216bf4 | 1508 | struct pci_bus_region region; |
b07f2ebc | 1509 | |
223d96fc | 1510 | /* Not assigned or rejected by kernel? */ |
fa216bf4 YL |
1511 | if (!r->flags) |
1512 | continue; | |
b07f2ebc | 1513 | |
fc279850 | 1514 | pcibios_resource_to_bus(dev->bus, ®ion, r); |
fa216bf4 | 1515 | if (!region.start) { |
223d96fc YL |
1516 | *unassigned = true; |
1517 | return 1; /* return early from pci_walk_bus() */ | |
b07f2ebc YL |
1518 | } |
1519 | } | |
b07f2ebc | 1520 | |
223d96fc | 1521 | return 0; |
b07f2ebc YL |
1522 | } |
1523 | ||
ff35147c | 1524 | static enum enable_type pci_realloc_detect(struct pci_bus *bus, |
967260cd | 1525 | enum enable_type enable_local) |
223d96fc YL |
1526 | { |
1527 | bool unassigned = false; | |
b07f2ebc | 1528 | |
967260cd YL |
1529 | if (enable_local != undefined) |
1530 | return enable_local; | |
223d96fc | 1531 | |
967260cd YL |
1532 | pci_walk_bus(bus, iov_resources_unassigned, &unassigned); |
1533 | if (unassigned) | |
1534 | return auto_enabled; | |
1535 | ||
1536 | return enable_local; | |
b07f2ebc | 1537 | } |
223d96fc | 1538 | #else |
ff35147c | 1539 | static enum enable_type pci_realloc_detect(struct pci_bus *bus, |
967260cd YL |
1540 | enum enable_type enable_local) |
1541 | { | |
1542 | return enable_local; | |
b07f2ebc | 1543 | } |
223d96fc | 1544 | #endif |
b07f2ebc | 1545 | |
da7822e5 YL |
1546 | /* |
1547 | * first try will not touch pci bridge res | |
f7625980 BH |
1548 | * second and later try will clear small leaf bridge res |
1549 | * will stop till to the max depth if can not find good one | |
da7822e5 | 1550 | */ |
39772038 | 1551 | void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus) |
1da177e4 | 1552 | { |
bdc4abec | 1553 | LIST_HEAD(realloc_head); /* list of resources that |
c8adf9a3 | 1554 | want additional resources */ |
bdc4abec | 1555 | struct list_head *add_list = NULL; |
da7822e5 YL |
1556 | int tried_times = 0; |
1557 | enum release_type rel_type = leaf_only; | |
bdc4abec | 1558 | LIST_HEAD(fail_head); |
b9b0bba9 | 1559 | struct pci_dev_resource *fail_res; |
da7822e5 | 1560 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | |
5b285415 | 1561 | IORESOURCE_PREFETCH | IORESOURCE_MEM_64; |
19aa7ee4 | 1562 | int pci_try_num = 1; |
55ed83a6 | 1563 | enum enable_type enable_local; |
da7822e5 | 1564 | |
19aa7ee4 | 1565 | /* don't realloc if asked to do so */ |
55ed83a6 | 1566 | enable_local = pci_realloc_detect(bus, pci_realloc_enable); |
967260cd | 1567 | if (pci_realloc_enabled(enable_local)) { |
55ed83a6 | 1568 | int max_depth = pci_bus_get_depth(bus); |
19aa7ee4 YL |
1569 | |
1570 | pci_try_num = max_depth + 1; | |
55ed83a6 YL |
1571 | dev_printk(KERN_DEBUG, &bus->dev, |
1572 | "max bus depth: %d pci_try_num: %d\n", | |
1573 | max_depth, pci_try_num); | |
19aa7ee4 | 1574 | } |
da7822e5 YL |
1575 | |
1576 | again: | |
19aa7ee4 YL |
1577 | /* |
1578 | * last try will use add_list, otherwise will try good to have as | |
1579 | * must have, so can realloc parent bridge resource | |
1580 | */ | |
1581 | if (tried_times + 1 == pci_try_num) | |
bdc4abec | 1582 | add_list = &realloc_head; |
1da177e4 LT |
1583 | /* Depth first, calculate sizes and alignments of all |
1584 | subordinate buses. */ | |
55ed83a6 | 1585 | __pci_bus_size_bridges(bus, add_list); |
c8adf9a3 | 1586 | |
1da177e4 | 1587 | /* Depth last, allocate resources and update the hardware. */ |
55ed83a6 | 1588 | __pci_bus_assign_resources(bus, add_list, &fail_head); |
19aa7ee4 | 1589 | if (add_list) |
bdc4abec | 1590 | BUG_ON(!list_empty(add_list)); |
da7822e5 YL |
1591 | tried_times++; |
1592 | ||
1593 | /* any device complain? */ | |
bdc4abec | 1594 | if (list_empty(&fail_head)) |
928bea96 | 1595 | goto dump; |
f483d392 | 1596 | |
0c5be0cb | 1597 | if (tried_times >= pci_try_num) { |
967260cd | 1598 | if (enable_local == undefined) |
55ed83a6 | 1599 | dev_info(&bus->dev, "Some PCI device resources are unassigned, try booting with pci=realloc\n"); |
967260cd | 1600 | else if (enable_local == auto_enabled) |
55ed83a6 | 1601 | dev_info(&bus->dev, "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n"); |
eb572e7c | 1602 | |
bffc56d4 | 1603 | free_list(&fail_head); |
928bea96 | 1604 | goto dump; |
da7822e5 YL |
1605 | } |
1606 | ||
55ed83a6 YL |
1607 | dev_printk(KERN_DEBUG, &bus->dev, |
1608 | "No. %d try to assign unassigned res\n", tried_times + 1); | |
da7822e5 YL |
1609 | |
1610 | /* third times and later will not check if it is leaf */ | |
1611 | if ((tried_times + 1) > 2) | |
1612 | rel_type = whole_subtree; | |
1613 | ||
1614 | /* | |
1615 | * Try to release leaf bridge's resources that doesn't fit resource of | |
1616 | * child device under that bridge | |
1617 | */ | |
61e83cdd YL |
1618 | list_for_each_entry(fail_res, &fail_head, list) |
1619 | pci_bus_release_bridge_resources(fail_res->dev->bus, | |
b9b0bba9 | 1620 | fail_res->flags & type_mask, |
bdc4abec | 1621 | rel_type); |
61e83cdd | 1622 | |
da7822e5 | 1623 | /* restore size and flags */ |
b9b0bba9 YL |
1624 | list_for_each_entry(fail_res, &fail_head, list) { |
1625 | struct resource *res = fail_res->res; | |
da7822e5 | 1626 | |
b9b0bba9 YL |
1627 | res->start = fail_res->start; |
1628 | res->end = fail_res->end; | |
1629 | res->flags = fail_res->flags; | |
1630 | if (fail_res->dev->subordinate) | |
da7822e5 | 1631 | res->flags = 0; |
da7822e5 | 1632 | } |
bffc56d4 | 1633 | free_list(&fail_head); |
da7822e5 YL |
1634 | |
1635 | goto again; | |
1636 | ||
928bea96 | 1637 | dump: |
76fbc263 | 1638 | /* dump the resource on buses */ |
55ed83a6 YL |
1639 | pci_bus_dump_resources(bus); |
1640 | } | |
1641 | ||
1642 | void __init pci_assign_unassigned_resources(void) | |
1643 | { | |
1644 | struct pci_bus *root_bus; | |
1645 | ||
1646 | list_for_each_entry(root_bus, &pci_root_buses, node) | |
1647 | pci_assign_unassigned_root_bus_resources(root_bus); | |
1da177e4 | 1648 | } |
6841ec68 YL |
1649 | |
1650 | void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge) | |
1651 | { | |
1652 | struct pci_bus *parent = bridge->subordinate; | |
bdc4abec | 1653 | LIST_HEAD(add_list); /* list of resources that |
8424d759 | 1654 | want additional resources */ |
32180e40 | 1655 | int tried_times = 0; |
bdc4abec | 1656 | LIST_HEAD(fail_head); |
b9b0bba9 | 1657 | struct pci_dev_resource *fail_res; |
6841ec68 | 1658 | int retval; |
32180e40 YL |
1659 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM | |
1660 | IORESOURCE_PREFETCH; | |
1661 | ||
32180e40 | 1662 | again: |
8424d759 | 1663 | __pci_bus_size_bridges(parent, &add_list); |
bdc4abec YL |
1664 | __pci_bridge_assign_resources(bridge, &add_list, &fail_head); |
1665 | BUG_ON(!list_empty(&add_list)); | |
32180e40 YL |
1666 | tried_times++; |
1667 | ||
bdc4abec | 1668 | if (list_empty(&fail_head)) |
3f579c34 | 1669 | goto enable_all; |
32180e40 YL |
1670 | |
1671 | if (tried_times >= 2) { | |
1672 | /* still fail, don't need to try more */ | |
bffc56d4 | 1673 | free_list(&fail_head); |
3f579c34 | 1674 | goto enable_all; |
32180e40 YL |
1675 | } |
1676 | ||
1677 | printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n", | |
1678 | tried_times + 1); | |
1679 | ||
1680 | /* | |
1681 | * Try to release leaf bridge's resources that doesn't fit resource of | |
1682 | * child device under that bridge | |
1683 | */ | |
61e83cdd YL |
1684 | list_for_each_entry(fail_res, &fail_head, list) |
1685 | pci_bus_release_bridge_resources(fail_res->dev->bus, | |
1686 | fail_res->flags & type_mask, | |
32180e40 | 1687 | whole_subtree); |
61e83cdd | 1688 | |
32180e40 | 1689 | /* restore size and flags */ |
b9b0bba9 YL |
1690 | list_for_each_entry(fail_res, &fail_head, list) { |
1691 | struct resource *res = fail_res->res; | |
32180e40 | 1692 | |
b9b0bba9 YL |
1693 | res->start = fail_res->start; |
1694 | res->end = fail_res->end; | |
1695 | res->flags = fail_res->flags; | |
1696 | if (fail_res->dev->subordinate) | |
32180e40 | 1697 | res->flags = 0; |
32180e40 | 1698 | } |
bffc56d4 | 1699 | free_list(&fail_head); |
32180e40 YL |
1700 | |
1701 | goto again; | |
3f579c34 YL |
1702 | |
1703 | enable_all: | |
1704 | retval = pci_reenable_device(bridge); | |
9fc9eea0 BH |
1705 | if (retval) |
1706 | dev_err(&bridge->dev, "Error reenabling bridge (%d)\n", retval); | |
3f579c34 | 1707 | pci_set_master(bridge); |
6841ec68 YL |
1708 | } |
1709 | EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources); | |
9b03088f | 1710 | |
17787940 | 1711 | void pci_assign_unassigned_bus_resources(struct pci_bus *bus) |
9b03088f | 1712 | { |
9b03088f | 1713 | struct pci_dev *dev; |
bdc4abec | 1714 | LIST_HEAD(add_list); /* list of resources that |
9b03088f YL |
1715 | want additional resources */ |
1716 | ||
9b03088f YL |
1717 | down_read(&pci_bus_sem); |
1718 | list_for_each_entry(dev, &bus->devices, bus_list) | |
6788a51f | 1719 | if (pci_is_bridge(dev) && pci_has_subordinate(dev)) |
9b03088f YL |
1720 | __pci_bus_size_bridges(dev->subordinate, |
1721 | &add_list); | |
1722 | up_read(&pci_bus_sem); | |
1723 | __pci_bus_assign_resources(bus, &add_list, NULL); | |
bdc4abec | 1724 | BUG_ON(!list_empty(&add_list)); |
17787940 | 1725 | } |