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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/pci/setup-res.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/* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
13
14/*
15 * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
16 * Resource sorting
17 */
18
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/pci.h>
22#include <linux/errno.h>
23#include <linux/ioport.h>
24#include <linux/cache.h>
25#include <linux/slab.h>
26#include "pci.h"
27
28
Yu Zhao14add802008-11-22 02:38:52 +080029void pci_update_resource(struct pci_dev *dev, int resno)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
31 struct pci_bus_region region;
32 u32 new, check, mask;
33 int reg;
Yu Zhao613e7ed2008-11-22 02:41:27 +080034 enum pci_bar_type type;
Yu Zhao14add802008-11-22 02:38:52 +080035 struct resource *res = dev->resource + resno;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Ralf Baechlefb0f2b42006-12-19 13:12:08 -080037 /*
38 * Ignore resources for unimplemented BARs and unused resource slots
39 * for 64 bit BARs.
40 */
Ivan Kokshayskycf7bee52005-08-07 13:49:59 +040041 if (!res->flags)
42 return;
43
Ralf Baechlefb0f2b42006-12-19 13:12:08 -080044 /*
45 * Ignore non-moveable resources. This might be legacy resources for
46 * which no functional BAR register exists or another important
Bjorn Helgaas80ccba12008-06-13 10:52:11 -060047 * system resource we shouldn't move around.
Ralf Baechlefb0f2b42006-12-19 13:12:08 -080048 */
49 if (res->flags & IORESOURCE_PCI_FIXED)
50 return;
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 pcibios_resource_to_bus(dev, &region, res);
53
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
55 if (res->flags & IORESOURCE_IO)
56 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
57 else
58 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
59
Yu Zhao613e7ed2008-11-22 02:41:27 +080060 reg = pci_resource_bar(dev, resno, &type);
61 if (!reg)
62 return;
63 if (type != pci_bar_unknown) {
Linus Torvalds755528c2005-08-26 10:49:22 -070064 if (!(res->flags & IORESOURCE_ROM_ENABLE))
65 return;
66 new |= PCI_ROM_ADDRESS_ENABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 }
68
69 pci_write_config_dword(dev, reg, new);
70 pci_read_config_dword(dev, reg, &check);
71
72 if ((new ^ check) & mask) {
Bjorn Helgaas80ccba12008-06-13 10:52:11 -060073 dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
74 resno, new, check);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 }
76
77 if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
78 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
Ivan Kokshayskycf7bee52005-08-07 13:49:59 +040079 new = region.start >> 16 >> 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 pci_write_config_dword(dev, reg + 4, new);
81 pci_read_config_dword(dev, reg + 4, &check);
82 if (check != new) {
Bjorn Helgaas80ccba12008-06-13 10:52:11 -060083 dev_err(&dev->dev, "BAR %d: error updating "
84 "(high %#08x != %#08x)\n", resno, new, check);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 }
86 }
87 res->flags &= ~IORESOURCE_UNSET;
Bjorn Helgaas1bcd4952010-09-29 12:23:54 -060088 dev_info(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx])\n",
Bjorn Helgaas865df572009-11-04 10:32:57 -070089 resno, res, (unsigned long long)region.start,
90 (unsigned long long)region.end);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
92
Sam Ravnborg96bde062007-03-26 21:53:30 -080093int pci_claim_resource(struct pci_dev *dev, int resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -070094{
95 struct resource *res = &dev->resource[resource];
Bjorn Helgaas966f3a72010-03-11 17:01:19 -070096 struct resource *root, *conflict;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Matthew Wilcoxcebd78a2009-06-17 16:33:33 -040098 root = pci_find_parent_resource(dev, res);
Bjorn Helgaas865df572009-11-04 10:32:57 -070099 if (!root) {
Bjorn Helgaasf6d440d2010-06-03 13:47:18 -0600100 dev_info(&dev->dev, "no compatible bridge window for %pR\n",
101 res);
Bjorn Helgaas865df572009-11-04 10:32:57 -0700102 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 }
104
Bjorn Helgaas966f3a72010-03-11 17:01:19 -0700105 conflict = request_resource_conflict(root, res);
106 if (conflict) {
Bjorn Helgaasf6d440d2010-06-03 13:47:18 -0600107 dev_info(&dev->dev,
108 "address space collision: %pR conflicts with %s %pR\n",
109 res, conflict->name, conflict);
Bjorn Helgaas966f3a72010-03-11 17:01:19 -0700110 return -EBUSY;
111 }
Bjorn Helgaas865df572009-11-04 10:32:57 -0700112
Bjorn Helgaas966f3a72010-03-11 17:01:19 -0700113 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
Jesse Barneseaa959d2009-06-30 21:45:44 -0700115EXPORT_SYMBOL(pci_claim_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Yuji Shimada32a9a6822009-03-16 17:13:39 +0900117#ifdef CONFIG_PCI_QUIRKS
118void pci_disable_bridge_window(struct pci_dev *dev)
119{
Bjorn Helgaas865df572009-11-04 10:32:57 -0700120 dev_info(&dev->dev, "disabling bridge mem windows\n");
Yuji Shimada32a9a6822009-03-16 17:13:39 +0900121
122 /* MMIO Base/Limit */
123 pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
124
125 /* Prefetchable MMIO Base/Limit */
126 pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
127 pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
128 pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
129}
130#endif /* CONFIG_PCI_QUIRKS */
131
Yinghai Lud09ee962009-04-23 20:49:25 -0700132static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
133 int resno)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 struct resource *res = dev->resource + resno;
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700136 resource_size_t size, min, align;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 int ret;
138
Zhao, Yu022edd82008-10-13 19:24:28 +0800139 size = resource_size(res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
Chris Wright6faf17f2009-08-28 13:00:06 -0700141 align = pci_resource_alignment(dev, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143 /* First, try exact prefetching match.. */
144 ret = pci_bus_alloc_resource(bus, res, size, align, min,
145 IORESOURCE_PREFETCH,
146 pcibios_align_resource, dev);
147
148 if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
149 /*
150 * That failed.
151 *
152 * But a prefetching area can handle a non-prefetching
153 * window (it will just not perform as well).
154 */
155 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
156 pcibios_align_resource, dev);
157 }
158
Bjorn Helgaas58c84ed2010-07-15 09:41:42 -0600159 if (ret < 0 && dev->fw_addr[resno]) {
160 struct resource *root, *conflict;
161 resource_size_t start, end;
162
163 /*
164 * If we failed to assign anything, let's try the address
165 * where firmware left it. That at least has a chance of
166 * working, which is better than just leaving it disabled.
167 */
168
169 if (res->flags & IORESOURCE_IO)
170 root = &ioport_resource;
171 else
172 root = &iomem_resource;
173
174 start = res->start;
175 end = res->end;
176 res->start = dev->fw_addr[resno];
177 res->end = res->start + size - 1;
178 dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n",
179 resno, res);
180 conflict = request_resource_conflict(root, res);
181 if (conflict) {
182 dev_info(&dev->dev,
183 "BAR %d: %pR conflicts with %s %pR\n", resno,
184 res, conflict->name, conflict);
185 res->start = start;
186 res->end = end;
187 } else
188 ret = 0;
189 }
190
Yinghai Lud09ee962009-04-23 20:49:25 -0700191 if (!ret) {
Ivan Kokshaysky88452562008-03-30 19:50:14 +0400192 res->flags &= ~IORESOURCE_STARTALIGN;
Bjorn Helgaas865df572009-11-04 10:32:57 -0700193 dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
Ivan Kokshaysky88452562008-03-30 19:50:14 +0400194 if (resno < PCI_BRIDGE_RESOURCES)
Yu Zhao14add802008-11-22 02:38:52 +0800195 pci_update_resource(dev, resno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 }
197
198 return ret;
199}
200
Yinghai Lud09ee962009-04-23 20:49:25 -0700201int pci_assign_resource(struct pci_dev *dev, int resno)
202{
203 struct resource *res = dev->resource + resno;
204 resource_size_t align;
205 struct pci_bus *bus;
206 int ret;
Bjorn Helgaas865df572009-11-04 10:32:57 -0700207 char *type;
Yinghai Lud09ee962009-04-23 20:49:25 -0700208
Chris Wright6faf17f2009-08-28 13:00:06 -0700209 align = pci_resource_alignment(dev, res);
Yinghai Lud09ee962009-04-23 20:49:25 -0700210 if (!align) {
Bjorn Helgaas865df572009-11-04 10:32:57 -0700211 dev_info(&dev->dev, "BAR %d: can't assign %pR "
Bjorn Helgaasa369c792009-10-06 15:33:44 -0600212 "(bogus alignment)\n", resno, res);
Yinghai Lud09ee962009-04-23 20:49:25 -0700213 return -EINVAL;
214 }
215
216 bus = dev->bus;
217 while ((ret = __pci_assign_resource(bus, dev, resno))) {
218 if (bus->parent && bus->self->transparent)
219 bus = bus->parent;
220 else
221 bus = NULL;
222 if (bus)
223 continue;
224 break;
225 }
226
Bjorn Helgaas865df572009-11-04 10:32:57 -0700227 if (ret) {
228 if (res->flags & IORESOURCE_MEM)
229 if (res->flags & IORESOURCE_PREFETCH)
230 type = "mem pref";
231 else
232 type = "mem";
233 else if (res->flags & IORESOURCE_IO)
234 type = "io";
235 else
236 type = "unknown";
237 dev_info(&dev->dev,
238 "BAR %d: can't assign %s (size %#llx)\n",
239 resno, type, (unsigned long long) resource_size(res));
240 }
Yinghai Lud09ee962009-04-23 20:49:25 -0700241
242 return ret;
243}
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245/* Sort resources by alignment */
Sam Ravnborg96bde062007-03-26 21:53:30 -0800246void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
248 int i;
249
250 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
251 struct resource *r;
252 struct resource_list *list, *tmp;
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700253 resource_size_t r_align;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255 r = &dev->resource[i];
Ralf Baechlefb0f2b42006-12-19 13:12:08 -0800256
257 if (r->flags & IORESOURCE_PCI_FIXED)
258 continue;
259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 if (!(r->flags) || r->parent)
261 continue;
Ivan Kokshaysky88452562008-03-30 19:50:14 +0400262
Chris Wright6faf17f2009-08-28 13:00:06 -0700263 r_align = pci_resource_alignment(dev, r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 if (!r_align) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600265 dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n",
Bjorn Helgaasa369c792009-10-06 15:33:44 -0600266 i, r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 continue;
268 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 for (list = head; ; list = list->next) {
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700270 resource_size_t align = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 struct resource_list *ln = list->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Ivan Kokshaysky88452562008-03-30 19:50:14 +0400273 if (ln)
Chris Wright6faf17f2009-08-28 13:00:06 -0700274 align = pci_resource_alignment(ln->dev, ln->res);
Ivan Kokshaysky88452562008-03-30 19:50:14 +0400275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 if (r_align > align) {
277 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
278 if (!tmp)
279 panic("pdev_sort_resources(): "
280 "kmalloc() failed!\n");
281 tmp->next = ln;
282 tmp->res = r;
283 tmp->dev = dev;
284 list->next = tmp;
285 break;
286 }
287 }
288 }
289}
Bjorn Helgaas842de402008-03-04 11:56:47 -0700290
291int pci_enable_resources(struct pci_dev *dev, int mask)
292{
293 u16 cmd, old_cmd;
294 int i;
295 struct resource *r;
296
297 pci_read_config_word(dev, PCI_COMMAND, &cmd);
298 old_cmd = cmd;
299
300 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
301 if (!(mask & (1 << i)))
302 continue;
303
304 r = &dev->resource[i];
305
306 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
307 continue;
308 if ((i == PCI_ROM_RESOURCE) &&
309 (!(r->flags & IORESOURCE_ROM_ENABLE)))
310 continue;
311
312 if (!r->parent) {
Bjorn Helgaas865df572009-11-04 10:32:57 -0700313 dev_err(&dev->dev, "device not available "
314 "(can't reserve %pR)\n", r);
Bjorn Helgaas842de402008-03-04 11:56:47 -0700315 return -EINVAL;
316 }
317
318 if (r->flags & IORESOURCE_IO)
319 cmd |= PCI_COMMAND_IO;
320 if (r->flags & IORESOURCE_MEM)
321 cmd |= PCI_COMMAND_MEMORY;
322 }
323
324 if (cmd != old_cmd) {
325 dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
326 old_cmd, cmd);
327 pci_write_config_word(dev, PCI_COMMAND, cmd);
328 }
329 return 0;
330}