blob: a66cf0905a15e921dcb6219cbf76a199a8c02335 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Bjorn Helgaas47087702012-02-23 14:29:23 -070028#include <asm-generic/pci-bridge.h>
Chris Wright6faf17f2009-08-28 13:00:06 -070029#include "pci.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Bjorn Helgaas844393f2012-02-23 20:18:59 -070031unsigned int pci_flags;
Bjorn Helgaas47087702012-02-23 14:29:23 -070032
Yinghai Lubdc4abe2012-01-21 02:08:27 -080033struct pci_dev_resource {
34 struct list_head list;
Yinghai Lu2934a0d2012-01-21 02:08:26 -080035 struct resource *res;
36 struct pci_dev *dev;
Yinghai Lu568ddef2010-01-22 01:02:21 -080037 resource_size_t start;
38 resource_size_t end;
Ram Paic8adf9a2011-02-14 17:43:20 -080039 resource_size_t add_size;
Ram Pai2bbc6942011-07-25 13:08:39 -070040 resource_size_t min_align;
Yinghai Lu568ddef2010-01-22 01:02:21 -080041 unsigned long flags;
42};
43
Yinghai Lubffc56d2012-01-21 02:08:30 -080044static 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}
Ram Pai094732a2011-02-14 17:43:18 -080053
Ram Paic8adf9a2011-02-14 17:43:20 -080054/**
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 */
Yinghai Lubdc4abe2012-01-21 02:08:27 -080063static int add_to_list(struct list_head *head,
Ram Paic8adf9a2011-02-14 17:43:20 -080064 struct pci_dev *dev, struct resource *res,
Ram Pai2bbc6942011-07-25 13:08:39 -070065 resource_size_t add_size, resource_size_t min_align)
Yinghai Lu568ddef2010-01-22 01:02:21 -080066{
Yinghai Lu764242a2012-01-21 02:08:28 -080067 struct pci_dev_resource *tmp;
Yinghai Lu568ddef2010-01-22 01:02:21 -080068
Yinghai Lubdc4abe2012-01-21 02:08:27 -080069 tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
Yinghai Lu568ddef2010-01-22 01:02:21 -080070 if (!tmp) {
Ram Paic8adf9a2011-02-14 17:43:20 -080071 pr_warning("add_to_list: kmalloc() failed!\n");
Yinghai Luef62dfe2012-01-21 02:08:18 -080072 return -ENOMEM;
Yinghai Lu568ddef2010-01-22 01:02:21 -080073 }
74
Yinghai Lu568ddef2010-01-22 01:02:21 -080075 tmp->res = res;
76 tmp->dev = dev;
77 tmp->start = res->start;
78 tmp->end = res->end;
79 tmp->flags = res->flags;
Ram Paic8adf9a2011-02-14 17:43:20 -080080 tmp->add_size = add_size;
Ram Pai2bbc6942011-07-25 13:08:39 -070081 tmp->min_align = min_align;
Yinghai Lubdc4abe2012-01-21 02:08:27 -080082
83 list_add(&tmp->list, head);
Yinghai Luef62dfe2012-01-21 02:08:18 -080084
85 return 0;
Yinghai Lu568ddef2010-01-22 01:02:21 -080086}
87
Yinghai Lub9b0bba2012-01-21 02:08:29 -080088static void remove_from_list(struct list_head *head,
Yinghai Lu3e6e0d82012-01-21 02:08:20 -080089 struct resource *res)
90{
Yinghai Lub9b0bba2012-01-21 02:08:29 -080091 struct pci_dev_resource *dev_res, *tmp;
Yinghai Lu3e6e0d82012-01-21 02:08:20 -080092
Yinghai Lub9b0bba2012-01-21 02:08:29 -080093 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);
Yinghai Lubdc4abe2012-01-21 02:08:27 -080097 break;
Yinghai Lu3e6e0d82012-01-21 02:08:20 -080098 }
Yinghai Lu3e6e0d82012-01-21 02:08:20 -080099 }
100}
101
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800102static resource_size_t get_res_add_size(struct list_head *head,
Yinghai Lu1c372352012-01-21 02:08:19 -0800103 struct resource *res)
104{
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800105 struct pci_dev_resource *dev_res;
Yinghai Lu1c372352012-01-21 02:08:19 -0800106
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800107 list_for_each_entry(dev_res, head, list) {
108 if (dev_res->res == res) {
Yinghai Lub5924432012-01-21 02:08:31 -0800109 int idx = res - &dev_res->dev->resource[0];
110
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800111 dev_printk(KERN_DEBUG, &dev_res->dev->dev,
Yinghai Lub5924432012-01-21 02:08:31 -0800112 "res[%d]=%pR get_res_add_size add_size %llx\n",
113 idx, dev_res->res,
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800114 (unsigned long long)dev_res->add_size);
Yinghai Lub5924432012-01-21 02:08:31 -0800115
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800116 return dev_res->add_size;
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800117 }
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800118 }
Yinghai Lu1c372352012-01-21 02:08:19 -0800119
120 return 0;
121}
122
Yinghai Lu78c3b322012-01-21 02:08:25 -0800123/* Sort resources by alignment */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800124static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
Yinghai Lu78c3b322012-01-21 02:08:25 -0800125{
126 int i;
127
128 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
129 struct resource *r;
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800130 struct pci_dev_resource *dev_res, *tmp;
Yinghai Lu78c3b322012-01-21 02:08:25 -0800131 resource_size_t r_align;
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800132 struct list_head *n;
Yinghai Lu78c3b322012-01-21 02:08:25 -0800133
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 }
Yinghai Lu78c3b322012-01-21 02:08:25 -0800148
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800149 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);
Yinghai Lu78c3b322012-01-21 02:08:25 -0800163
164 if (r_align > align) {
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800165 n = &dev_res->list;
Yinghai Lu78c3b322012-01-21 02:08:25 -0800166 break;
167 }
168 }
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800169 /* Insert it just before n*/
170 list_add_tail(&tmp->list, n);
Yinghai Lu78c3b322012-01-21 02:08:25 -0800171 }
172}
173
Yinghai Lu6841ec62010-01-22 01:02:25 -0800174static void __dev_sort_resources(struct pci_dev *dev,
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800175 struct list_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
Yinghai Lu6841ec62010-01-22 01:02:25 -0800177 u16 class = dev->class >> 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Yinghai Lu6841ec62010-01-22 01:02:25 -0800179 /* Don't touch classless devices or host bridges or ioapics. */
180 if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
181 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Yinghai Lu6841ec62010-01-22 01:02:25 -0800183 /* 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 }
190
Yinghai Lu6841ec62010-01-22 01:02:25 -0800191 pdev_sort_resources(dev, head);
192}
193
Ram Paifc075e12011-02-14 17:43:19 -0800194static inline void reset_resource(struct resource *res)
195{
196 res->start = 0;
197 res->end = 0;
198 res->flags = 0;
199}
200
Ram Paic8adf9a2011-02-14 17:43:20 -0800201/**
Ram Pai9e8bf932011-07-25 13:08:42 -0700202 * reassign_resources_sorted() - satisfy any additional resource requests
Ram Paic8adf9a2011-02-14 17:43:20 -0800203 *
Ram Pai9e8bf932011-07-25 13:08:42 -0700204 * @realloc_head : head of the list tracking requests requiring additional
Ram Paic8adf9a2011-02-14 17:43:20 -0800205 * resources
206 * @head : head of the list tracking requests with allocated
207 * resources
208 *
Ram Pai9e8bf932011-07-25 13:08:42 -0700209 * Walk through each element of the realloc_head and try to procure
Ram Paic8adf9a2011-02-14 17:43:20 -0800210 * additional resources for the element, provided the element
211 * is in the head list.
212 */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800213static void reassign_resources_sorted(struct list_head *realloc_head,
214 struct list_head *head)
Ram Paic8adf9a2011-02-14 17:43:20 -0800215{
216 struct resource *res;
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800217 struct pci_dev_resource *add_res, *tmp;
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800218 struct pci_dev_resource *dev_res;
Ram Paic8adf9a2011-02-14 17:43:20 -0800219 resource_size_t add_size;
220 int idx;
221
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800222 list_for_each_entry_safe(add_res, tmp, realloc_head, list) {
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800223 bool found_match = false;
224
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800225 res = add_res->res;
Ram Paic8adf9a2011-02-14 17:43:20 -0800226 /* skip resource that has been reset */
227 if (!res->flags)
228 goto out;
229
230 /* skip this resource if not found in head list */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800231 list_for_each_entry(dev_res, head, list) {
232 if (dev_res->res == res) {
233 found_match = true;
234 break;
235 }
Ram Paic8adf9a2011-02-14 17:43:20 -0800236 }
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800237 if (!found_match)/* just skip */
238 continue;
Ram Paic8adf9a2011-02-14 17:43:20 -0800239
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800240 idx = res - &add_res->dev->resource[0];
241 add_size = add_res->add_size;
Ram Pai2bbc6942011-07-25 13:08:39 -0700242 if (!resource_size(res)) {
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800243 res->start = add_res->start;
Ram Pai2bbc6942011-07-25 13:08:39 -0700244 res->end = res->start + add_size - 1;
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800245 if (pci_assign_resource(add_res->dev, idx))
Ram Paic8adf9a2011-02-14 17:43:20 -0800246 reset_resource(res);
Ram Pai2bbc6942011-07-25 13:08:39 -0700247 } else {
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800248 resource_size_t align = add_res->min_align;
249 res->flags |= add_res->flags &
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800250 (IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN);
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800251 if (pci_reassign_resource(add_res->dev, idx,
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800252 add_size, align))
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800253 dev_printk(KERN_DEBUG, &add_res->dev->dev,
Yinghai Lub5924432012-01-21 02:08:31 -0800254 "failed to add %llx res[%d]=%pR\n",
255 (unsigned long long)add_size,
256 idx, res);
Ram Paic8adf9a2011-02-14 17:43:20 -0800257 }
258out:
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800259 list_del(&add_res->list);
260 kfree(add_res);
Ram Paic8adf9a2011-02-14 17:43:20 -0800261 }
262}
263
264/**
265 * assign_requested_resources_sorted() - satisfy resource requests
266 *
267 * @head : head of the list tracking requests for resources
Wanpeng Li8356aad2012-06-15 21:15:49 +0800268 * @fail_head : head of the list tracking requests that could
Ram Paic8adf9a2011-02-14 17:43:20 -0800269 * 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 */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800274static void assign_requested_resources_sorted(struct list_head *head,
275 struct list_head *fail_head)
Yinghai Lu6841ec62010-01-22 01:02:25 -0800276{
277 struct resource *res;
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800278 struct pci_dev_resource *dev_res;
Yinghai Lu6841ec62010-01-22 01:02:25 -0800279 int idx;
280
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800281 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)) {
Yinghai Lu9a928662010-02-28 15:49:39 -0800287 /*
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))))
Yinghai Lu67cc7e22012-01-21 02:08:32 -0800293 add_to_list(fail_head,
294 dev_res->dev, res,
295 0 /* dont care */,
296 0 /* dont care */);
Yinghai Lu9a928662010-02-28 15:49:39 -0800297 }
Ram Paifc075e12011-02-14 17:43:19 -0800298 reset_resource(res);
Rajesh Shah542df5d2005-04-28 00:25:50 -0700299 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 }
301}
302
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800303static void __assign_resources_sorted(struct list_head *head,
304 struct list_head *realloc_head,
305 struct list_head *fail_head)
Ram Paic8adf9a2011-02-14 17:43:20 -0800306{
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800307 /*
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.
Masanari Iida367fa982012-07-23 22:39:51 +0900311 * Try to assign requested + add_size at beginning
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800312 * 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 */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800316 LIST_HEAD(save_head);
317 LIST_HEAD(local_fail_head);
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800318 struct pci_dev_resource *save_res;
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800319 struct pci_dev_resource *dev_res;
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800320
321 /* Check if optional add_size is there */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800322 if (!realloc_head || list_empty(realloc_head))
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800323 goto requested_and_reassign;
324
325 /* Save original start, end, flags etc at first */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800326 list_for_each_entry(dev_res, head, list) {
327 if (add_to_list(&save_head, dev_res->dev, dev_res->res, 0, 0)) {
Yinghai Lubffc56d2012-01-21 02:08:30 -0800328 free_list(&save_head);
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800329 goto requested_and_reassign;
330 }
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800331 }
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800332
333 /* Update res in head list with add_size in realloc_head list */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800334 list_for_each_entry(dev_res, head, list)
335 dev_res->res->end += get_res_add_size(realloc_head,
336 dev_res->res);
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800337
338 /* Try updated head list with add_size added */
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800339 assign_requested_resources_sorted(head, &local_fail_head);
340
341 /* all assigned with add_size ? */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800342 if (list_empty(&local_fail_head)) {
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800343 /* Remove head list from realloc_head list */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800344 list_for_each_entry(dev_res, head, list)
345 remove_from_list(realloc_head, dev_res->res);
Yinghai Lubffc56d2012-01-21 02:08:30 -0800346 free_list(&save_head);
347 free_list(head);
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800348 return;
349 }
350
Yinghai Lubffc56d2012-01-21 02:08:30 -0800351 free_list(&local_fail_head);
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800352 /* Release assigned resource */
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800353 list_for_each_entry(dev_res, head, list)
354 if (dev_res->res->parent)
355 release_resource(dev_res->res);
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800356 /* Restore start/end/flags from saved list */
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800357 list_for_each_entry(save_res, &save_head, list) {
358 struct resource *res = save_res->res;
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800359
Yinghai Lub9b0bba2012-01-21 02:08:29 -0800360 res->start = save_res->start;
361 res->end = save_res->end;
362 res->flags = save_res->flags;
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800363 }
Yinghai Lubffc56d2012-01-21 02:08:30 -0800364 free_list(&save_head);
Yinghai Lu3e6e0d82012-01-21 02:08:20 -0800365
366requested_and_reassign:
Ram Paic8adf9a2011-02-14 17:43:20 -0800367 /* Satisfy the must-have resource requests */
368 assign_requested_resources_sorted(head, fail_head);
369
Ram Pai0a2daa12011-07-25 13:08:41 -0700370 /* Try to satisfy any additional optional resource
Ram Paic8adf9a2011-02-14 17:43:20 -0800371 requests */
Ram Pai9e8bf932011-07-25 13:08:42 -0700372 if (realloc_head)
373 reassign_resources_sorted(realloc_head, head);
Yinghai Lubffc56d2012-01-21 02:08:30 -0800374 free_list(head);
Ram Paic8adf9a2011-02-14 17:43:20 -0800375}
376
Yinghai Lu6841ec62010-01-22 01:02:25 -0800377static void pdev_assign_resources_sorted(struct pci_dev *dev,
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800378 struct list_head *add_head,
379 struct list_head *fail_head)
Yinghai Lu6841ec62010-01-22 01:02:25 -0800380{
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800381 LIST_HEAD(head);
Yinghai Lu6841ec62010-01-22 01:02:25 -0800382
Yinghai Lu6841ec62010-01-22 01:02:25 -0800383 __dev_sort_resources(dev, &head);
Yinghai Lu8424d752012-01-21 02:08:21 -0800384 __assign_resources_sorted(&head, add_head, fail_head);
Yinghai Lu6841ec62010-01-22 01:02:25 -0800385
386}
387
388static void pbus_assign_resources_sorted(const struct pci_bus *bus,
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800389 struct list_head *realloc_head,
390 struct list_head *fail_head)
Yinghai Lu6841ec62010-01-22 01:02:25 -0800391{
392 struct pci_dev *dev;
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800393 LIST_HEAD(head);
Yinghai Lu6841ec62010-01-22 01:02:25 -0800394
Yinghai Lu6841ec62010-01-22 01:02:25 -0800395 list_for_each_entry(dev, &bus->devices, bus_list)
396 __dev_sort_resources(dev, &head);
397
Ram Pai9e8bf932011-07-25 13:08:42 -0700398 __assign_resources_sorted(&head, realloc_head, fail_head);
Yinghai Lu6841ec62010-01-22 01:02:25 -0800399}
400
Dominik Brodowskib3743fa2005-09-09 13:03:23 -0700401void pci_setup_cardbus(struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402{
403 struct pci_dev *bridge = bus->self;
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600404 struct resource *res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 struct pci_bus_region region;
406
Yinghai Lub918c622012-05-17 18:51:11 -0700407 dev_info(&bridge->dev, "CardBus bridge to %pR\n",
408 &bus->busn_res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600410 res = bus->resource[0];
411 pcibios_resource_to_bus(bridge, &region, res);
412 if (res->flags & IORESOURCE_IO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 /*
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 */
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600417 dev_info(&bridge->dev, " bridge window %pR\n", res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 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
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600424 res = bus->resource[1];
425 pcibios_resource_to_bus(bridge, &region, res);
426 if (res->flags & IORESOURCE_IO) {
427 dev_info(&bridge->dev, " bridge window %pR\n", res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 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
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600434 res = bus->resource[2];
435 pcibios_resource_to_bus(bridge, &region, res);
436 if (res->flags & IORESOURCE_MEM) {
437 dev_info(&bridge->dev, " bridge window %pR\n", res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 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
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600444 res = bus->resource[3];
445 pcibios_resource_to_bus(bridge, &region, res);
446 if (res->flags & IORESOURCE_MEM) {
447 dev_info(&bridge->dev, " bridge window %pR\n", res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 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}
Dominik Brodowskib3743fa2005-09-09 13:03:23 -0700454EXPORT_SYMBOL(pci_setup_cardbus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
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. */
Yinghai Lu7cc59972009-12-22 15:02:21 -0800467static void pci_setup_bridge_io(struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468{
469 struct pci_dev *bridge = bus->self;
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600470 struct resource *res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 struct pci_bus_region region;
Bjorn Helgaas2b28ae12012-07-09 13:38:57 -0600472 unsigned long io_mask;
473 u8 io_base_lo, io_limit_lo;
Yinghai Lu7cc59972009-12-22 15:02:21 -0800474 u32 l, io_upper16;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
Bjorn Helgaas2b28ae12012-07-09 13:38:57 -0600476 io_mask = PCI_IO_RANGE_MASK;
477 if (bridge->io_window_1k)
478 io_mask = PCI_IO_1K_RANGE_MASK;
479
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 /* Set up the top and bottom of the PCI I/O segment for this bus. */
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600481 res = bus->resource[0];
482 pcibios_resource_to_bus(bridge, &region, res);
483 if (res->flags & IORESOURCE_IO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 pci_read_config_dword(bridge, PCI_IO_BASE, &l);
485 l &= 0xffff0000;
Bjorn Helgaas2b28ae12012-07-09 13:38:57 -0600486 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 /* Set up upper 16 bits of I/O base/limit. */
490 io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600491 dev_info(&bridge->dev, " bridge window %pR\n", res);
Yinghai Lu7cc59972009-12-22 15:02:21 -0800492 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 /* Clear upper 16 bits of I/O base/limit. */
494 io_upper16 = 0;
495 l = 0x00f0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 }
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);
Yinghai Lu7cc59972009-12-22 15:02:21 -0800503}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
Yinghai Lu7cc59972009-12-22 15:02:21 -0800505static 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;
511
512 /* Set up the top and bottom of the PCI Memory segment for this bus. */
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600513 res = bus->resource[1];
514 pcibios_resource_to_bus(bridge, &region, res);
515 if (res->flags & IORESOURCE_MEM) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 l = (region.start >> 16) & 0xfff0;
517 l |= region.end & 0xfff00000;
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600518 dev_info(&bridge->dev, " bridge window %pR\n", res);
Yinghai Lu7cc59972009-12-22 15:02:21 -0800519 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 l = 0x0000fff0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 }
522 pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
Yinghai Lu7cc59972009-12-22 15:02:21 -0800523}
524
525static 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
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. */
Benjamin Herrenschmidtc40a22e2007-12-10 17:32:15 +1100538 bu = lu = 0;
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600539 res = bus->resource[2];
540 pcibios_resource_to_bus(bridge, &region, res);
541 if (res->flags & IORESOURCE_PREFETCH) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 l = (region.start >> 16) & 0xfff0;
543 l |= region.end & 0xfff00000;
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600544 if (res->flags & IORESOURCE_MEM_64) {
Yinghai Lu1f82de12009-04-23 20:48:32 -0700545 bu = upper_32_bits(region.start);
546 lu = upper_32_bits(region.end);
Yinghai Lu1f82de12009-04-23 20:48:32 -0700547 }
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600548 dev_info(&bridge->dev, " bridge window %pR\n", res);
Yinghai Lu7cc59972009-12-22 15:02:21 -0800549 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 l = 0x0000fff0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 }
552 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
553
Alex Williamson59353ea2009-11-30 14:51:44 -0700554 /* 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);
Yinghai Lu7cc59972009-12-22 15:02:21 -0800557}
558
559static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
560{
561 struct pci_dev *bridge = bus->self;
562
Yinghai Lub918c622012-05-17 18:51:11 -0700563 dev_info(&bridge->dev, "PCI bridge to %pR\n",
564 &bus->busn_res);
Yinghai Lu7cc59972009-12-22 15:02:21 -0800565
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
575 pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
576}
577
Benjamin Herrenschmidte2444272011-09-11 14:08:38 -0300578void pci_setup_bridge(struct pci_bus *bus)
Yinghai Lu7cc59972009-12-22 15:02:21 -0800579{
580 unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
581 IORESOURCE_PREFETCH;
582
583 __pci_setup_bridge(bus, type);
584}
585
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586/* 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. */
Sam Ravnborg96bde062007-03-26 21:53:30 -0800589static void pci_bridge_check_ranges(struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590{
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 }
Yinghai Lu1f82de12009-04-23 20:48:32 -0700619 if (pmem) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
Yinghai Lu99586102010-01-22 01:02:28 -0800621 if ((pmem & PCI_PREF_RANGE_TYPE_MASK) ==
622 PCI_PREF_RANGE_TYPE_64) {
Yinghai Lu1f82de12009-04-23 20:48:32 -0700623 b_res[2].flags |= IORESOURCE_MEM_64;
Yinghai Lu99586102010-01-22 01:02:28 -0800624 b_res[2].flags |= PCI_PREF_RANGE_TYPE_64;
625 }
Yinghai Lu1f82de12009-04-23 20:48:32 -0700626 }
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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641}
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). */
Sam Ravnborg96bde062007-03-26 21:53:30 -0800647static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648{
649 int i;
650 struct resource *r;
651 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
652 IORESOURCE_PREFETCH;
653
Bjorn Helgaas89a74ec2010-02-23 10:24:31 -0700654 pci_bus_for_each_resource(bus, r, i) {
Ivan Kokshaysky299de032005-06-15 18:59:27 +0400655 if (r == &ioport_resource || r == &iomem_resource)
656 continue;
Jesse Barnes55a10982009-10-27 09:39:18 -0700657 if (r && (r->flags & type_mask) == type && !r->parent)
658 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 }
660 return NULL;
661}
662
Ram Pai13583b12011-02-14 17:43:17 -0800663static 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
684static 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
Gavin Shanac5ad932012-09-11 16:59:45 -0600700resource_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
710static 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
Ram Paic8adf9a2011-02-14 17:43:20 -0800732/**
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
Ram Pai9e8bf932011-07-25 13:08:42 -0700738 * @realloc_head : track the additional io window on this list
Ram Paic8adf9a2011-02-14 17:43:20 -0800739 *
740 * Sizing the IO windows of the PCI-PCI bridge is trivial,
Yinghai Lufd591342012-07-09 19:55:29 -0600741 * since these windows have 1K or 4K granularity and the IO ranges
Ram Paic8adf9a2011-02-14 17:43:20 -0800742 * of non-bridge PCI devices are limited to 256 bytes.
743 * We must be careful with the ISA aliasing though.
744 */
745static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800746 resource_size_t add_size, struct list_head *realloc_head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
748 struct pci_dev *dev;
749 struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
Ram Paic8adf9a2011-02-14 17:43:20 -0800750 unsigned long size = 0, size0 = 0, size1 = 0;
Yinghai Lube768912011-07-25 13:08:38 -0700751 resource_size_t children_add_size = 0;
Gavin Shan462d9302012-09-11 16:59:46 -0600752 resource_size_t min_align, io_align, align;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
754 if (!b_res)
755 return;
756
Gavin Shan462d9302012-09-11 16:59:46 -0600757 io_align = min_align = window_alignment(bus, IORESOURCE_IO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 list_for_each_entry(dev, &bus->devices, bus_list) {
759 int i;
760
761 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
762 struct resource *r = &dev->resource[i];
763 unsigned long r_size;
764
765 if (r->parent || !(r->flags & IORESOURCE_IO))
766 continue;
Zhao, Yu022edd82008-10-13 19:24:28 +0800767 r_size = resource_size(r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
769 if (r_size < 0x400)
770 /* Might be re-aligned for ISA */
771 size += r_size;
772 else
773 size1 += r_size;
Yinghai Lube768912011-07-25 13:08:38 -0700774
Yinghai Lufd591342012-07-09 19:55:29 -0600775 align = pci_resource_alignment(dev, r);
776 if (align > min_align)
777 min_align = align;
778
Ram Pai9e8bf932011-07-25 13:08:42 -0700779 if (realloc_head)
780 children_add_size += get_res_add_size(realloc_head, r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 }
782 }
Yinghai Lufd591342012-07-09 19:55:29 -0600783
Gavin Shan462d9302012-09-11 16:59:46 -0600784 if (min_align > io_align)
785 min_align = io_align;
Yinghai Lufd591342012-07-09 19:55:29 -0600786
Ram Paic8adf9a2011-02-14 17:43:20 -0800787 size0 = calculate_iosize(size, min_size, size1,
Yinghai Lufd591342012-07-09 19:55:29 -0600788 resource_size(b_res), min_align);
Yinghai Lube768912011-07-25 13:08:38 -0700789 if (children_add_size > add_size)
790 add_size = children_add_size;
Ram Pai9e8bf932011-07-25 13:08:42 -0700791 size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
Yinghai Lua4ac9fe2012-01-21 02:08:17 -0800792 calculate_iosize(size, min_size, add_size + size1,
Yinghai Lufd591342012-07-09 19:55:29 -0600793 resource_size(b_res), min_align);
Ram Paic8adf9a2011-02-14 17:43:20 -0800794 if (!size0 && !size1) {
Bjorn Helgaas865df572009-11-04 10:32:57 -0700795 if (b_res->start || b_res->end)
796 dev_info(&bus->self->dev, "disabling bridge window "
Yinghai Lub918c622012-05-17 18:51:11 -0700797 "%pR to %pR (unused)\n", b_res,
798 &bus->busn_res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 b_res->flags = 0;
800 return;
801 }
Yinghai Lufd591342012-07-09 19:55:29 -0600802
803 b_res->start = min_align;
Ram Paic8adf9a2011-02-14 17:43:20 -0800804 b_res->end = b_res->start + size0 - 1;
Ivan Kokshaysky88452562008-03-30 19:50:14 +0400805 b_res->flags |= IORESOURCE_STARTALIGN;
Yinghai Lub5924432012-01-21 02:08:31 -0800806 if (size1 > size0 && realloc_head) {
Yinghai Lufd591342012-07-09 19:55:29 -0600807 add_to_list(realloc_head, bus->self, b_res, size1-size0,
808 min_align);
Yinghai Lub5924432012-01-21 02:08:31 -0800809 dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window "
Yinghai Lub918c622012-05-17 18:51:11 -0700810 "%pR to %pR add_size %lx\n", b_res,
811 &bus->busn_res, size1-size0);
Yinghai Lub5924432012-01-21 02:08:31 -0800812 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813}
814
Ram Paic8adf9a2011-02-14 17:43:20 -0800815/**
816 * pbus_size_mem() - size the memory window of a given bus
817 *
818 * @bus : the bus
819 * @min_size : the minimum memory window that must to be allocated
820 * @add_size : additional optional memory window
Ram Pai9e8bf932011-07-25 13:08:42 -0700821 * @realloc_head : track the additional memory window on this list
Ram Paic8adf9a2011-02-14 17:43:20 -0800822 *
823 * Calculate the size of the bus and minimal alignment which
824 * guarantees that all child resources fit in this size.
825 */
Eric W. Biederman28760482009-09-09 14:09:24 -0700826static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
Ram Paic8adf9a2011-02-14 17:43:20 -0800827 unsigned long type, resource_size_t min_size,
828 resource_size_t add_size,
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800829 struct list_head *realloc_head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830{
831 struct pci_dev *dev;
Ram Paic8adf9a2011-02-14 17:43:20 -0800832 resource_size_t min_align, align, size, size0, size1;
Benjamin Herrenschmidtc40a22e2007-12-10 17:32:15 +1100833 resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 int order, max_order;
835 struct resource *b_res = find_free_bus_resource(bus, type);
Yinghai Lu1f82de12009-04-23 20:48:32 -0700836 unsigned int mem64_mask = 0;
Yinghai Lube768912011-07-25 13:08:38 -0700837 resource_size_t children_add_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
839 if (!b_res)
840 return 0;
841
842 memset(aligns, 0, sizeof(aligns));
843 max_order = 0;
844 size = 0;
845
Yinghai Lu1f82de12009-04-23 20:48:32 -0700846 mem64_mask = b_res->flags & IORESOURCE_MEM_64;
847 b_res->flags &= ~IORESOURCE_MEM_64;
848
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 list_for_each_entry(dev, &bus->devices, bus_list) {
850 int i;
Yinghai Lu1f82de12009-04-23 20:48:32 -0700851
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
853 struct resource *r = &dev->resource[i];
Benjamin Herrenschmidtc40a22e2007-12-10 17:32:15 +1100854 resource_size_t r_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
856 if (r->parent || (r->flags & mask) != type)
857 continue;
Zhao, Yu022edd82008-10-13 19:24:28 +0800858 r_size = resource_size(r);
Yinghai Lu2aceefc2011-07-25 13:08:40 -0700859#ifdef CONFIG_PCI_IOV
860 /* put SRIOV requested res to the optional list */
Ram Pai9e8bf932011-07-25 13:08:42 -0700861 if (realloc_head && i >= PCI_IOV_RESOURCES &&
Yinghai Lu2aceefc2011-07-25 13:08:40 -0700862 i <= PCI_IOV_RESOURCE_END) {
863 r->end = r->start - 1;
Ram Pai9e8bf932011-07-25 13:08:42 -0700864 add_to_list(realloc_head, dev, r, r_size, 0/* dont' care */);
Yinghai Lu2aceefc2011-07-25 13:08:40 -0700865 children_add_size += r_size;
866 continue;
867 }
868#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 /* For bridges size != alignment */
Chris Wright6faf17f2009-08-28 13:00:06 -0700870 align = pci_resource_alignment(dev, r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 order = __ffs(align) - 20;
872 if (order > 11) {
Bjorn Helgaas865df572009-11-04 10:32:57 -0700873 dev_warn(&dev->dev, "disabling BAR %d: %pR "
874 "(bad alignment %#llx)\n", i, r,
875 (unsigned long long) align);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 r->flags = 0;
877 continue;
878 }
879 size += r_size;
880 if (order < 0)
881 order = 0;
882 /* Exclude ranges with size > align from
883 calculation of the alignment. */
884 if (r_size == align)
885 aligns[order] += align;
886 if (order > max_order)
887 max_order = order;
Yinghai Lu1f82de12009-04-23 20:48:32 -0700888 mem64_mask &= r->flags & IORESOURCE_MEM_64;
Yinghai Lube768912011-07-25 13:08:38 -0700889
Ram Pai9e8bf932011-07-25 13:08:42 -0700890 if (realloc_head)
891 children_add_size += get_res_add_size(realloc_head, r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 }
893 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 align = 0;
895 min_align = 0;
896 for (order = 0; order <= max_order; order++) {
Jeremy Fitzhardinge8308c542008-09-11 01:31:50 -0700897 resource_size_t align1 = 1;
898
899 align1 <<= (order + 20);
900
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 if (!align)
902 min_align = align1;
Milind Arun Choudhary6f6f8c22007-07-09 11:55:51 -0700903 else if (ALIGN(align + min_align, min_align) < align1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 min_align = align1 >> 1;
905 align += aligns[order];
906 }
Gavin Shan462d9302012-09-11 16:59:46 -0600907
908 min_align = max(min_align, window_alignment(bus, b_res->flags & mask));
Linus Torvaldsb42282e2011-04-11 10:53:11 -0700909 size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align);
Yinghai Lube768912011-07-25 13:08:38 -0700910 if (children_add_size > add_size)
911 add_size = children_add_size;
Ram Pai9e8bf932011-07-25 13:08:42 -0700912 size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
Yinghai Lua4ac9fe2012-01-21 02:08:17 -0800913 calculate_memsize(size, min_size, add_size,
Linus Torvaldsb42282e2011-04-11 10:53:11 -0700914 resource_size(b_res), min_align);
Ram Paic8adf9a2011-02-14 17:43:20 -0800915 if (!size0 && !size1) {
Bjorn Helgaas865df572009-11-04 10:32:57 -0700916 if (b_res->start || b_res->end)
917 dev_info(&bus->self->dev, "disabling bridge window "
Yinghai Lub918c622012-05-17 18:51:11 -0700918 "%pR to %pR (unused)\n", b_res,
919 &bus->busn_res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 b_res->flags = 0;
921 return 1;
922 }
923 b_res->start = min_align;
Ram Paic8adf9a2011-02-14 17:43:20 -0800924 b_res->end = size0 + min_align - 1;
925 b_res->flags |= IORESOURCE_STARTALIGN | mem64_mask;
Yinghai Lub5924432012-01-21 02:08:31 -0800926 if (size1 > size0 && realloc_head) {
Ram Pai9e8bf932011-07-25 13:08:42 -0700927 add_to_list(realloc_head, bus->self, b_res, size1-size0, min_align);
Yinghai Lub5924432012-01-21 02:08:31 -0800928 dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window "
Yinghai Lub918c622012-05-17 18:51:11 -0700929 "%pR to %pR add_size %llx\n", b_res,
930 &bus->busn_res, (unsigned long long)size1-size0);
Yinghai Lub5924432012-01-21 02:08:31 -0800931 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 return 1;
933}
934
Ram Pai0a2daa12011-07-25 13:08:41 -0700935unsigned long pci_cardbus_resource_alignment(struct resource *res)
936{
937 if (res->flags & IORESOURCE_IO)
938 return pci_cardbus_io_size;
939 if (res->flags & IORESOURCE_MEM)
940 return pci_cardbus_mem_size;
941 return 0;
942}
943
944static void pci_bus_size_cardbus(struct pci_bus *bus,
Yinghai Lubdc4abe2012-01-21 02:08:27 -0800945 struct list_head *realloc_head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946{
947 struct pci_dev *bridge = bus->self;
948 struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
Yinghai Lu11848932012-02-10 15:33:47 -0800949 resource_size_t b_res_3_size = pci_cardbus_mem_size * 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 u16 ctrl;
951
Yinghai Lu3796f1e2012-02-10 15:33:48 -0800952 if (b_res[0].parent)
953 goto handle_b_res_1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 /*
955 * Reserve some resources for CardBus. We reserve
956 * a fixed amount of bus space for CardBus bridges.
957 */
Yinghai Lu11848932012-02-10 15:33:47 -0800958 b_res[0].start = pci_cardbus_io_size;
959 b_res[0].end = b_res[0].start + pci_cardbus_io_size - 1;
960 b_res[0].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
961 if (realloc_head) {
962 b_res[0].end -= pci_cardbus_io_size;
963 add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size,
964 pci_cardbus_io_size);
965 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
Yinghai Lu3796f1e2012-02-10 15:33:48 -0800967handle_b_res_1:
968 if (b_res[1].parent)
969 goto handle_b_res_2;
Yinghai Lu11848932012-02-10 15:33:47 -0800970 b_res[1].start = pci_cardbus_io_size;
971 b_res[1].end = b_res[1].start + pci_cardbus_io_size - 1;
972 b_res[1].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
973 if (realloc_head) {
974 b_res[1].end -= pci_cardbus_io_size;
975 add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size,
976 pci_cardbus_io_size);
977 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
Yinghai Lu3796f1e2012-02-10 15:33:48 -0800979handle_b_res_2:
Yinghai Ludcef0d02012-02-10 15:33:46 -0800980 /* MEM1 must not be pref mmio */
981 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
982 if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM1) {
983 ctrl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
984 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
985 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
986 }
987
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 /*
989 * Check whether prefetchable memory is supported
990 * by this bridge.
991 */
992 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
993 if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
994 ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
995 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
996 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
997 }
998
Yinghai Lu3796f1e2012-02-10 15:33:48 -0800999 if (b_res[2].parent)
1000 goto handle_b_res_3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 /*
1002 * If we have prefetchable memory support, allocate
1003 * two regions. Otherwise, allocate one region of
1004 * twice the size.
1005 */
1006 if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
Yinghai Lu11848932012-02-10 15:33:47 -08001007 b_res[2].start = pci_cardbus_mem_size;
1008 b_res[2].end = b_res[2].start + pci_cardbus_mem_size - 1;
1009 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH |
1010 IORESOURCE_STARTALIGN;
1011 if (realloc_head) {
1012 b_res[2].end -= pci_cardbus_mem_size;
1013 add_to_list(realloc_head, bridge, b_res+2,
1014 pci_cardbus_mem_size, pci_cardbus_mem_size);
1015 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
Yinghai Lu11848932012-02-10 15:33:47 -08001017 /* reduce that to half */
1018 b_res_3_size = pci_cardbus_mem_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 }
Ram Pai0a2daa12011-07-25 13:08:41 -07001020
Yinghai Lu3796f1e2012-02-10 15:33:48 -08001021handle_b_res_3:
1022 if (b_res[3].parent)
1023 goto handle_done;
Yinghai Lu11848932012-02-10 15:33:47 -08001024 b_res[3].start = pci_cardbus_mem_size;
1025 b_res[3].end = b_res[3].start + b_res_3_size - 1;
1026 b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN;
1027 if (realloc_head) {
1028 b_res[3].end -= b_res_3_size;
1029 add_to_list(realloc_head, bridge, b_res+3, b_res_3_size,
1030 pci_cardbus_mem_size);
1031 }
Yinghai Lu3796f1e2012-02-10 15:33:48 -08001032
1033handle_done:
1034 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035}
1036
Ram Paic8adf9a2011-02-14 17:43:20 -08001037void __ref __pci_bus_size_bridges(struct pci_bus *bus,
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001038 struct list_head *realloc_head)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039{
1040 struct pci_dev *dev;
1041 unsigned long mask, prefmask;
Ram Paic8adf9a2011-02-14 17:43:20 -08001042 resource_size_t additional_mem_size = 0, additional_io_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043
1044 list_for_each_entry(dev, &bus->devices, bus_list) {
1045 struct pci_bus *b = dev->subordinate;
1046 if (!b)
1047 continue;
1048
1049 switch (dev->class >> 8) {
1050 case PCI_CLASS_BRIDGE_CARDBUS:
Ram Pai9e8bf932011-07-25 13:08:42 -07001051 pci_bus_size_cardbus(b, realloc_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 break;
1053
1054 case PCI_CLASS_BRIDGE_PCI:
1055 default:
Ram Pai9e8bf932011-07-25 13:08:42 -07001056 __pci_bus_size_bridges(b, realloc_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 break;
1058 }
1059 }
1060
1061 /* The root bus? */
1062 if (!bus->self)
1063 return;
1064
1065 switch (bus->self->class >> 8) {
1066 case PCI_CLASS_BRIDGE_CARDBUS:
1067 /* don't size cardbuses yet. */
1068 break;
1069
1070 case PCI_CLASS_BRIDGE_PCI:
1071 pci_bridge_check_ranges(bus);
Eric W. Biederman28760482009-09-09 14:09:24 -07001072 if (bus->self->is_hotplug_bridge) {
Ram Paic8adf9a2011-02-14 17:43:20 -08001073 additional_io_size = pci_hotplug_io_size;
1074 additional_mem_size = pci_hotplug_mem_size;
Eric W. Biederman28760482009-09-09 14:09:24 -07001075 }
Ram Paic8adf9a2011-02-14 17:43:20 -08001076 /*
1077 * Follow thru
1078 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 default:
Yinghai Lu19aa7ee2012-01-21 02:08:24 -08001080 pbus_size_io(bus, realloc_head ? 0 : additional_io_size,
1081 additional_io_size, realloc_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 /* If the bridge supports prefetchable range, size it
1083 separately. If it doesn't, or its prefetchable window
1084 has already been allocated by arch code, try
1085 non-prefetchable range for both types of PCI memory
1086 resources. */
1087 mask = IORESOURCE_MEM;
1088 prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
Yinghai Lu19aa7ee2012-01-21 02:08:24 -08001089 if (pbus_size_mem(bus, prefmask, prefmask,
1090 realloc_head ? 0 : additional_mem_size,
1091 additional_mem_size, realloc_head))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 mask = prefmask; /* Success, size non-prefetch only. */
Eric W. Biederman28760482009-09-09 14:09:24 -07001093 else
Ram Paic8adf9a2011-02-14 17:43:20 -08001094 additional_mem_size += additional_mem_size;
Yinghai Lu19aa7ee2012-01-21 02:08:24 -08001095 pbus_size_mem(bus, mask, IORESOURCE_MEM,
1096 realloc_head ? 0 : additional_mem_size,
1097 additional_mem_size, realloc_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 break;
1099 }
1100}
Ram Paic8adf9a2011-02-14 17:43:20 -08001101
1102void __ref pci_bus_size_bridges(struct pci_bus *bus)
1103{
1104 __pci_bus_size_bridges(bus, NULL);
1105}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106EXPORT_SYMBOL(pci_bus_size_bridges);
1107
Yinghai Lu568ddef2010-01-22 01:02:21 -08001108static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001109 struct list_head *realloc_head,
1110 struct list_head *fail_head)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111{
1112 struct pci_bus *b;
1113 struct pci_dev *dev;
1114
Ram Pai9e8bf932011-07-25 13:08:42 -07001115 pbus_assign_resources_sorted(bus, realloc_head, fail_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 list_for_each_entry(dev, &bus->devices, bus_list) {
1118 b = dev->subordinate;
1119 if (!b)
1120 continue;
1121
Ram Pai9e8bf932011-07-25 13:08:42 -07001122 __pci_bus_assign_resources(b, realloc_head, fail_head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123
1124 switch (dev->class >> 8) {
1125 case PCI_CLASS_BRIDGE_PCI:
Yinghai Lu6841ec62010-01-22 01:02:25 -08001126 if (!pci_is_enabled(dev))
1127 pci_setup_bridge(b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 break;
1129
1130 case PCI_CLASS_BRIDGE_CARDBUS:
1131 pci_setup_cardbus(b);
1132 break;
1133
1134 default:
Bjorn Helgaas80ccba12008-06-13 10:52:11 -06001135 dev_info(&dev->dev, "not setting up bridge for bus "
1136 "%04x:%02x\n", pci_domain_nr(b), b->number);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 break;
1138 }
1139 }
1140}
Yinghai Lu568ddef2010-01-22 01:02:21 -08001141
1142void __ref pci_bus_assign_resources(const struct pci_bus *bus)
1143{
Ram Paic8adf9a2011-02-14 17:43:20 -08001144 __pci_bus_assign_resources(bus, NULL, NULL);
Yinghai Lu568ddef2010-01-22 01:02:21 -08001145}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146EXPORT_SYMBOL(pci_bus_assign_resources);
1147
Yinghai Lu6841ec62010-01-22 01:02:25 -08001148static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001149 struct list_head *add_head,
1150 struct list_head *fail_head)
Yinghai Lu6841ec62010-01-22 01:02:25 -08001151{
1152 struct pci_bus *b;
1153
Yinghai Lu8424d752012-01-21 02:08:21 -08001154 pdev_assign_resources_sorted((struct pci_dev *)bridge,
1155 add_head, fail_head);
Yinghai Lu6841ec62010-01-22 01:02:25 -08001156
1157 b = bridge->subordinate;
1158 if (!b)
1159 return;
1160
Yinghai Lu8424d752012-01-21 02:08:21 -08001161 __pci_bus_assign_resources(b, add_head, fail_head);
Yinghai Lu6841ec62010-01-22 01:02:25 -08001162
1163 switch (bridge->class >> 8) {
1164 case PCI_CLASS_BRIDGE_PCI:
1165 pci_setup_bridge(b);
1166 break;
1167
1168 case PCI_CLASS_BRIDGE_CARDBUS:
1169 pci_setup_cardbus(b);
1170 break;
1171
1172 default:
1173 dev_info(&bridge->dev, "not setting up bridge for bus "
1174 "%04x:%02x\n", pci_domain_nr(b), b->number);
1175 break;
1176 }
1177}
Yinghai Lu5009b462010-01-22 01:02:20 -08001178static void pci_bridge_release_resources(struct pci_bus *bus,
1179 unsigned long type)
1180{
1181 int idx;
1182 bool changed = false;
1183 struct pci_dev *dev;
1184 struct resource *r;
1185 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1186 IORESOURCE_PREFETCH;
1187
1188 dev = bus->self;
1189 for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END;
1190 idx++) {
1191 r = &dev->resource[idx];
1192 if ((r->flags & type_mask) != type)
1193 continue;
1194 if (!r->parent)
1195 continue;
1196 /*
1197 * if there are children under that, we should release them
1198 * all
1199 */
1200 release_child_resources(r);
1201 if (!release_resource(r)) {
1202 dev_printk(KERN_DEBUG, &dev->dev,
1203 "resource %d %pR released\n", idx, r);
1204 /* keep the old size */
1205 r->end = resource_size(r) - 1;
1206 r->start = 0;
1207 r->flags = 0;
1208 changed = true;
1209 }
1210 }
1211
1212 if (changed) {
1213 /* avoiding touch the one without PREF */
1214 if (type & IORESOURCE_PREFETCH)
1215 type = IORESOURCE_PREFETCH;
1216 __pci_setup_bridge(bus, type);
1217 }
1218}
1219
1220enum release_type {
1221 leaf_only,
1222 whole_subtree,
1223};
1224/*
1225 * try to release pci bridge resources that is from leaf bridge,
1226 * so we can allocate big new one later
1227 */
1228static void __ref pci_bus_release_bridge_resources(struct pci_bus *bus,
1229 unsigned long type,
1230 enum release_type rel_type)
1231{
1232 struct pci_dev *dev;
1233 bool is_leaf_bridge = true;
1234
1235 list_for_each_entry(dev, &bus->devices, bus_list) {
1236 struct pci_bus *b = dev->subordinate;
1237 if (!b)
1238 continue;
1239
1240 is_leaf_bridge = false;
1241
1242 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1243 continue;
1244
1245 if (rel_type == whole_subtree)
1246 pci_bus_release_bridge_resources(b, type,
1247 whole_subtree);
1248 }
1249
1250 if (pci_is_root_bus(bus))
1251 return;
1252
1253 if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1254 return;
1255
1256 if ((rel_type == whole_subtree) || is_leaf_bridge)
1257 pci_bridge_release_resources(bus, type);
1258}
1259
Yinghai Lu76fbc262008-06-23 20:33:06 +02001260static void pci_bus_dump_res(struct pci_bus *bus)
1261{
Bjorn Helgaas89a74ec2010-02-23 10:24:31 -07001262 struct resource *res;
1263 int i;
Yinghai Lu76fbc262008-06-23 20:33:06 +02001264
Bjorn Helgaas89a74ec2010-02-23 10:24:31 -07001265 pci_bus_for_each_resource(bus, res, i) {
Yinghai Lu7c9342b2009-12-22 15:02:24 -08001266 if (!res || !res->end || !res->flags)
Yinghai Lu76fbc262008-06-23 20:33:06 +02001267 continue;
1268
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -06001269 dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);
Yinghai Lu76fbc262008-06-23 20:33:06 +02001270 }
1271}
1272
1273static void pci_bus_dump_resources(struct pci_bus *bus)
1274{
1275 struct pci_bus *b;
1276 struct pci_dev *dev;
1277
1278
1279 pci_bus_dump_res(bus);
1280
1281 list_for_each_entry(dev, &bus->devices, bus_list) {
1282 b = dev->subordinate;
1283 if (!b)
1284 continue;
1285
1286 pci_bus_dump_resources(b);
1287 }
1288}
1289
Yinghai Luda7822e2011-05-12 17:11:37 -07001290static int __init pci_bus_get_depth(struct pci_bus *bus)
1291{
1292 int depth = 0;
1293 struct pci_dev *dev;
1294
1295 list_for_each_entry(dev, &bus->devices, bus_list) {
1296 int ret;
1297 struct pci_bus *b = dev->subordinate;
1298 if (!b)
1299 continue;
1300
1301 ret = pci_bus_get_depth(b);
1302 if (ret + 1 > depth)
1303 depth = ret + 1;
1304 }
1305
1306 return depth;
1307}
1308static int __init pci_get_max_depth(void)
1309{
1310 int depth = 0;
1311 struct pci_bus *bus;
1312
1313 list_for_each_entry(bus, &pci_root_buses, node) {
1314 int ret;
1315
1316 ret = pci_bus_get_depth(bus);
1317 if (ret > depth)
1318 depth = ret;
1319 }
1320
1321 return depth;
1322}
1323
Yinghai Lub55438f2012-02-23 19:23:30 -08001324/*
1325 * -1: undefined, will auto detect later
1326 * 0: disabled by user
1327 * 1: disabled by auto detect
1328 * 2: enabled by user
1329 * 3: enabled by auto detect
1330 */
1331enum enable_type {
1332 undefined = -1,
1333 user_disabled,
1334 auto_disabled,
1335 user_enabled,
1336 auto_enabled,
1337};
1338
1339static enum enable_type pci_realloc_enable __initdata = undefined;
1340void __init pci_realloc_get_opt(char *str)
1341{
1342 if (!strncmp(str, "off", 3))
1343 pci_realloc_enable = user_disabled;
1344 else if (!strncmp(str, "on", 2))
1345 pci_realloc_enable = user_enabled;
1346}
1347static bool __init pci_realloc_enabled(void)
1348{
1349 return pci_realloc_enable >= user_enabled;
1350}
Ram Paif483d392011-07-07 11:19:10 -07001351
Yinghai Lub07f2eb2012-02-23 19:23:32 -08001352static void __init pci_realloc_detect(void)
1353{
1354#if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)
1355 struct pci_dev *dev = NULL;
1356
1357 if (pci_realloc_enable != undefined)
1358 return;
1359
1360 for_each_pci_dev(dev) {
1361 int i;
1362
1363 for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
1364 struct resource *r = &dev->resource[i];
1365
1366 /* Not assigned, or rejected by kernel ? */
1367 if (r->flags && !r->start) {
1368 pci_realloc_enable = auto_enabled;
1369
1370 return;
1371 }
1372 }
1373 }
1374#endif
1375}
1376
Yinghai Luda7822e2011-05-12 17:11:37 -07001377/*
1378 * first try will not touch pci bridge res
1379 * second and later try will clear small leaf bridge res
1380 * will stop till to the max deepth if can not find good one
1381 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382void __init
1383pci_assign_unassigned_resources(void)
1384{
1385 struct pci_bus *bus;
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001386 LIST_HEAD(realloc_head); /* list of resources that
Ram Paic8adf9a2011-02-14 17:43:20 -08001387 want additional resources */
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001388 struct list_head *add_list = NULL;
Yinghai Luda7822e2011-05-12 17:11:37 -07001389 int tried_times = 0;
1390 enum release_type rel_type = leaf_only;
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001391 LIST_HEAD(fail_head);
Yinghai Lub9b0bba2012-01-21 02:08:29 -08001392 struct pci_dev_resource *fail_res;
Yinghai Luda7822e2011-05-12 17:11:37 -07001393 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1394 IORESOURCE_PREFETCH;
Yinghai Lu19aa7ee2012-01-21 02:08:24 -08001395 int pci_try_num = 1;
Yinghai Luda7822e2011-05-12 17:11:37 -07001396
Yinghai Lu19aa7ee2012-01-21 02:08:24 -08001397 /* don't realloc if asked to do so */
Yinghai Lub07f2eb2012-02-23 19:23:32 -08001398 pci_realloc_detect();
Yinghai Lu19aa7ee2012-01-21 02:08:24 -08001399 if (pci_realloc_enabled()) {
1400 int max_depth = pci_get_max_depth();
1401
1402 pci_try_num = max_depth + 1;
1403 printk(KERN_DEBUG "PCI: max bus depth: %d pci_try_num: %d\n",
1404 max_depth, pci_try_num);
1405 }
Yinghai Luda7822e2011-05-12 17:11:37 -07001406
1407again:
Yinghai Lu19aa7ee2012-01-21 02:08:24 -08001408 /*
1409 * last try will use add_list, otherwise will try good to have as
1410 * must have, so can realloc parent bridge resource
1411 */
1412 if (tried_times + 1 == pci_try_num)
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001413 add_list = &realloc_head;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 /* Depth first, calculate sizes and alignments of all
1415 subordinate buses. */
Yinghai Luda7822e2011-05-12 17:11:37 -07001416 list_for_each_entry(bus, &pci_root_buses, node)
Yinghai Lu19aa7ee2012-01-21 02:08:24 -08001417 __pci_bus_size_bridges(bus, add_list);
Ram Paic8adf9a2011-02-14 17:43:20 -08001418
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 /* Depth last, allocate resources and update the hardware. */
Yinghai Luda7822e2011-05-12 17:11:37 -07001420 list_for_each_entry(bus, &pci_root_buses, node)
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001421 __pci_bus_assign_resources(bus, add_list, &fail_head);
Yinghai Lu19aa7ee2012-01-21 02:08:24 -08001422 if (add_list)
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001423 BUG_ON(!list_empty(add_list));
Yinghai Luda7822e2011-05-12 17:11:37 -07001424 tried_times++;
1425
1426 /* any device complain? */
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001427 if (list_empty(&fail_head))
Yinghai Luda7822e2011-05-12 17:11:37 -07001428 goto enable_and_dump;
Ram Paif483d392011-07-07 11:19:10 -07001429
Yinghai Lu0c5be0c2012-02-23 19:23:29 -08001430 if (tried_times >= pci_try_num) {
Yinghai Lueb572e72012-02-23 19:23:31 -08001431 if (pci_realloc_enable == undefined)
1432 printk(KERN_INFO "Some PCI device resources are unassigned, try booting with pci=realloc\n");
Yinghai Lub07f2eb2012-02-23 19:23:32 -08001433 else if (pci_realloc_enable == auto_enabled)
1434 printk(KERN_INFO "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");
Yinghai Lueb572e72012-02-23 19:23:31 -08001435
Yinghai Lubffc56d2012-01-21 02:08:30 -08001436 free_list(&fail_head);
Yinghai Luda7822e2011-05-12 17:11:37 -07001437 goto enable_and_dump;
1438 }
1439
1440 printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
1441 tried_times + 1);
1442
1443 /* third times and later will not check if it is leaf */
1444 if ((tried_times + 1) > 2)
1445 rel_type = whole_subtree;
1446
1447 /*
1448 * Try to release leaf bridge's resources that doesn't fit resource of
1449 * child device under that bridge
1450 */
Yinghai Lub9b0bba2012-01-21 02:08:29 -08001451 list_for_each_entry(fail_res, &fail_head, list) {
1452 bus = fail_res->dev->bus;
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001453 pci_bus_release_bridge_resources(bus,
Yinghai Lub9b0bba2012-01-21 02:08:29 -08001454 fail_res->flags & type_mask,
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001455 rel_type);
Yinghai Luda7822e2011-05-12 17:11:37 -07001456 }
1457 /* restore size and flags */
Yinghai Lub9b0bba2012-01-21 02:08:29 -08001458 list_for_each_entry(fail_res, &fail_head, list) {
1459 struct resource *res = fail_res->res;
Yinghai Luda7822e2011-05-12 17:11:37 -07001460
Yinghai Lub9b0bba2012-01-21 02:08:29 -08001461 res->start = fail_res->start;
1462 res->end = fail_res->end;
1463 res->flags = fail_res->flags;
1464 if (fail_res->dev->subordinate)
Yinghai Luda7822e2011-05-12 17:11:37 -07001465 res->flags = 0;
Yinghai Luda7822e2011-05-12 17:11:37 -07001466 }
Yinghai Lubffc56d2012-01-21 02:08:30 -08001467 free_list(&fail_head);
Yinghai Luda7822e2011-05-12 17:11:37 -07001468
1469 goto again;
1470
1471enable_and_dump:
1472 /* Depth last, update the hardware. */
1473 list_for_each_entry(bus, &pci_root_buses, node)
1474 pci_enable_bridges(bus);
Yinghai Lu76fbc262008-06-23 20:33:06 +02001475
1476 /* dump the resource on buses */
Yinghai Luda7822e2011-05-12 17:11:37 -07001477 list_for_each_entry(bus, &pci_root_buses, node)
Yinghai Lu76fbc262008-06-23 20:33:06 +02001478 pci_bus_dump_resources(bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479}
Yinghai Lu6841ec62010-01-22 01:02:25 -08001480
1481void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
1482{
1483 struct pci_bus *parent = bridge->subordinate;
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001484 LIST_HEAD(add_list); /* list of resources that
Yinghai Lu8424d752012-01-21 02:08:21 -08001485 want additional resources */
Yinghai Lu32180e42010-01-22 01:02:27 -08001486 int tried_times = 0;
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001487 LIST_HEAD(fail_head);
Yinghai Lub9b0bba2012-01-21 02:08:29 -08001488 struct pci_dev_resource *fail_res;
Yinghai Lu6841ec62010-01-22 01:02:25 -08001489 int retval;
Yinghai Lu32180e42010-01-22 01:02:27 -08001490 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1491 IORESOURCE_PREFETCH;
Yinghai Lu6841ec62010-01-22 01:02:25 -08001492
Yinghai Lu32180e42010-01-22 01:02:27 -08001493again:
Yinghai Lu8424d752012-01-21 02:08:21 -08001494 __pci_bus_size_bridges(parent, &add_list);
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001495 __pci_bridge_assign_resources(bridge, &add_list, &fail_head);
1496 BUG_ON(!list_empty(&add_list));
Yinghai Lu32180e42010-01-22 01:02:27 -08001497 tried_times++;
1498
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001499 if (list_empty(&fail_head))
Yinghai Lu3f579c32010-05-21 14:35:06 -07001500 goto enable_all;
Yinghai Lu32180e42010-01-22 01:02:27 -08001501
1502 if (tried_times >= 2) {
1503 /* still fail, don't need to try more */
Yinghai Lubffc56d2012-01-21 02:08:30 -08001504 free_list(&fail_head);
Yinghai Lu3f579c32010-05-21 14:35:06 -07001505 goto enable_all;
Yinghai Lu32180e42010-01-22 01:02:27 -08001506 }
1507
1508 printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
1509 tried_times + 1);
1510
1511 /*
1512 * Try to release leaf bridge's resources that doesn't fit resource of
1513 * child device under that bridge
1514 */
Yinghai Lub9b0bba2012-01-21 02:08:29 -08001515 list_for_each_entry(fail_res, &fail_head, list) {
1516 struct pci_bus *bus = fail_res->dev->bus;
1517 unsigned long flags = fail_res->flags;
Yinghai Lu32180e42010-01-22 01:02:27 -08001518
1519 pci_bus_release_bridge_resources(bus, flags & type_mask,
1520 whole_subtree);
Yinghai Lu32180e42010-01-22 01:02:27 -08001521 }
1522 /* restore size and flags */
Yinghai Lub9b0bba2012-01-21 02:08:29 -08001523 list_for_each_entry(fail_res, &fail_head, list) {
1524 struct resource *res = fail_res->res;
Yinghai Lu32180e42010-01-22 01:02:27 -08001525
Yinghai Lub9b0bba2012-01-21 02:08:29 -08001526 res->start = fail_res->start;
1527 res->end = fail_res->end;
1528 res->flags = fail_res->flags;
1529 if (fail_res->dev->subordinate)
Yinghai Lu32180e42010-01-22 01:02:27 -08001530 res->flags = 0;
Yinghai Lu32180e42010-01-22 01:02:27 -08001531 }
Yinghai Lubffc56d2012-01-21 02:08:30 -08001532 free_list(&fail_head);
Yinghai Lu32180e42010-01-22 01:02:27 -08001533
1534 goto again;
Yinghai Lu3f579c32010-05-21 14:35:06 -07001535
1536enable_all:
1537 retval = pci_reenable_device(bridge);
1538 pci_set_master(bridge);
1539 pci_enable_bridges(parent);
Yinghai Lu6841ec62010-01-22 01:02:25 -08001540}
1541EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
Yinghai Lu9b030882012-01-21 02:08:23 -08001542
1543#ifdef CONFIG_HOTPLUG
1544/**
1545 * pci_rescan_bus - scan a PCI bus for devices.
1546 * @bus: PCI bus to scan
1547 *
1548 * Scan a PCI bus and child buses for new devices, adds them,
1549 * and enables them.
1550 *
1551 * Returns the max number of subordinate bus discovered.
1552 */
1553unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1554{
1555 unsigned int max;
1556 struct pci_dev *dev;
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001557 LIST_HEAD(add_list); /* list of resources that
Yinghai Lu9b030882012-01-21 02:08:23 -08001558 want additional resources */
1559
1560 max = pci_scan_child_bus(bus);
1561
Yinghai Lu9b030882012-01-21 02:08:23 -08001562 down_read(&pci_bus_sem);
1563 list_for_each_entry(dev, &bus->devices, bus_list)
1564 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1565 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1566 if (dev->subordinate)
1567 __pci_bus_size_bridges(dev->subordinate,
1568 &add_list);
1569 up_read(&pci_bus_sem);
1570 __pci_bus_assign_resources(bus, &add_list, NULL);
Yinghai Lubdc4abe2012-01-21 02:08:27 -08001571 BUG_ON(!list_empty(&add_list));
Yinghai Lu9b030882012-01-21 02:08:23 -08001572
1573 pci_enable_bridges(bus);
1574 pci_bus_add_devices(bus);
1575
1576 return max;
1577}
1578EXPORT_SYMBOL_GPL(pci_rescan_bus);
1579#endif