Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/pci/bus.c | |
3 | * | |
4 | * From setup-res.c, by: | |
5 | * Dave Rusling (david.rusling@reo.mts.dec.com) | |
6 | * David Mosberger (davidm@cs.arizona.edu) | |
7 | * David Miller (davem@redhat.com) | |
8 | * Ivan Kokshaysky (ink@jurassic.park.msu.ru) | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/pci.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/ioport.h> | |
15 | #include <linux/proc_fs.h> | |
16 | #include <linux/init.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 LT |
18 | |
19 | #include "pci.h" | |
20 | ||
0efd5aab BH |
21 | void pci_add_resource_offset(struct list_head *resources, struct resource *res, |
22 | resource_size_t offset) | |
45ca9e97 | 23 | { |
0efd5aab | 24 | struct pci_host_bridge_window *window; |
45ca9e97 | 25 | |
0efd5aab BH |
26 | window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL); |
27 | if (!window) { | |
28 | printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res); | |
45ca9e97 BH |
29 | return; |
30 | } | |
31 | ||
0efd5aab BH |
32 | window->res = res; |
33 | window->offset = offset; | |
34 | list_add_tail(&window->list, resources); | |
35 | } | |
36 | EXPORT_SYMBOL(pci_add_resource_offset); | |
37 | ||
38 | void pci_add_resource(struct list_head *resources, struct resource *res) | |
39 | { | |
40 | pci_add_resource_offset(resources, res, 0); | |
45ca9e97 BH |
41 | } |
42 | EXPORT_SYMBOL(pci_add_resource); | |
43 | ||
44 | void pci_free_resource_list(struct list_head *resources) | |
45 | { | |
0efd5aab | 46 | struct pci_host_bridge_window *window, *tmp; |
45ca9e97 | 47 | |
0efd5aab BH |
48 | list_for_each_entry_safe(window, tmp, resources, list) { |
49 | list_del(&window->list); | |
50 | kfree(window); | |
45ca9e97 BH |
51 | } |
52 | } | |
53 | EXPORT_SYMBOL(pci_free_resource_list); | |
54 | ||
2fe2abf8 BH |
55 | void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, |
56 | unsigned int flags) | |
57 | { | |
58 | struct pci_bus_resource *bus_res; | |
59 | ||
60 | bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL); | |
61 | if (!bus_res) { | |
62 | dev_err(&bus->dev, "can't add %pR resource\n", res); | |
63 | return; | |
64 | } | |
65 | ||
66 | bus_res->res = res; | |
67 | bus_res->flags = flags; | |
68 | list_add_tail(&bus_res->list, &bus->resources); | |
69 | } | |
70 | ||
71 | struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n) | |
72 | { | |
73 | struct pci_bus_resource *bus_res; | |
74 | ||
75 | if (n < PCI_BRIDGE_RESOURCE_NUM) | |
76 | return bus->resource[n]; | |
77 | ||
78 | n -= PCI_BRIDGE_RESOURCE_NUM; | |
79 | list_for_each_entry(bus_res, &bus->resources, list) { | |
80 | if (n-- == 0) | |
81 | return bus_res->res; | |
82 | } | |
83 | return NULL; | |
84 | } | |
85 | EXPORT_SYMBOL_GPL(pci_bus_resource_n); | |
86 | ||
87 | void pci_bus_remove_resources(struct pci_bus *bus) | |
88 | { | |
2fe2abf8 | 89 | int i; |
817a2685 | 90 | struct pci_bus_resource *bus_res, *tmp; |
2fe2abf8 BH |
91 | |
92 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) | |
7736a05a | 93 | bus->resource[i] = NULL; |
2fe2abf8 | 94 | |
817a2685 YL |
95 | list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) { |
96 | list_del(&bus_res->list); | |
97 | kfree(bus_res); | |
98 | } | |
2fe2abf8 BH |
99 | } |
100 | ||
1da177e4 LT |
101 | /** |
102 | * pci_bus_alloc_resource - allocate a resource from a parent bus | |
103 | * @bus: PCI bus | |
104 | * @res: resource to allocate | |
105 | * @size: size of resource to allocate | |
106 | * @align: alignment of resource to allocate | |
107 | * @min: minimum /proc/iomem address to allocate | |
108 | * @type_mask: IORESOURCE_* type flags | |
109 | * @alignf: resource alignment function | |
110 | * @alignf_data: data argument for resource alignment function | |
111 | * | |
112 | * Given the PCI bus a device resides on, the size, minimum address, | |
113 | * alignment and type, try to find an acceptable resource allocation | |
114 | * for a specific device resource. | |
115 | */ | |
116 | int | |
117 | pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, | |
e31dd6e4 GKH |
118 | resource_size_t size, resource_size_t align, |
119 | resource_size_t min, unsigned int type_mask, | |
b26b2d49 | 120 | resource_size_t (*alignf)(void *, |
3b7a17fc | 121 | const struct resource *, |
b26b2d49 DB |
122 | resource_size_t, |
123 | resource_size_t), | |
e31dd6e4 | 124 | void *alignf_data) |
1da177e4 | 125 | { |
6db45b76 | 126 | int i, ret = -ENOMEM; |
89a74ecc | 127 | struct resource *r; |
1f82de10 | 128 | resource_size_t max = -1; |
1da177e4 LT |
129 | |
130 | type_mask |= IORESOURCE_IO | IORESOURCE_MEM; | |
131 | ||
1f82de10 YL |
132 | /* don't allocate too high if the pref mem doesn't support 64bit*/ |
133 | if (!(res->flags & IORESOURCE_MEM_64)) | |
134 | max = PCIBIOS_MAX_MEM_32; | |
135 | ||
6db45b76 BH |
136 | pci_bus_for_each_resource(bus, r, i) { |
137 | if (!r) | |
138 | continue; | |
139 | ||
1da177e4 LT |
140 | /* type_mask must match */ |
141 | if ((res->flags ^ r->flags) & type_mask) | |
142 | continue; | |
143 | ||
144 | /* We cannot allocate a non-prefetching resource | |
145 | from a pre-fetching area */ | |
146 | if ((r->flags & IORESOURCE_PREFETCH) && | |
147 | !(res->flags & IORESOURCE_PREFETCH)) | |
148 | continue; | |
149 | ||
150 | /* Ok, try it out.. */ | |
688d1918 LT |
151 | ret = allocate_resource(r, res, size, |
152 | r->start ? : min, | |
1f82de10 | 153 | max, align, |
1da177e4 LT |
154 | alignf, alignf_data); |
155 | if (ret == 0) | |
156 | break; | |
157 | } | |
158 | return ret; | |
159 | } | |
160 | ||
161 | /** | |
3fa16fdb | 162 | * pci_bus_add_device - add a single device |
1da177e4 LT |
163 | * @dev: device to add |
164 | * | |
165 | * This adds a single pci device to the global | |
166 | * device list and adds sysfs and procfs entries | |
167 | */ | |
96bde06a | 168 | int pci_bus_add_device(struct pci_dev *dev) |
1da177e4 | 169 | { |
b19441af | 170 | int retval; |
735bff10 | 171 | |
95df8b87 | 172 | pci_fixup_device(pci_fixup_final, dev); |
b19441af GKH |
173 | retval = device_add(&dev->dev); |
174 | if (retval) | |
175 | return retval; | |
1da177e4 | 176 | |
8a1bc901 | 177 | dev->is_added = 1; |
1da177e4 LT |
178 | pci_proc_attach_device(dev); |
179 | pci_create_sysfs_dev_files(dev); | |
b19441af | 180 | return 0; |
1da177e4 LT |
181 | } |
182 | ||
876e501a YZ |
183 | /** |
184 | * pci_bus_add_child - add a child bus | |
185 | * @bus: bus to add | |
186 | * | |
187 | * This adds sysfs entries for a single bus | |
188 | */ | |
189 | int pci_bus_add_child(struct pci_bus *bus) | |
190 | { | |
191 | int retval; | |
192 | ||
193 | if (bus->bridge) | |
194 | bus->dev.parent = bus->bridge; | |
195 | ||
196 | retval = device_register(&bus->dev); | |
197 | if (retval) | |
198 | return retval; | |
199 | ||
200 | bus->is_added = 1; | |
201 | ||
876e501a YZ |
202 | /* Create legacy_io and legacy_mem files for this bus */ |
203 | pci_create_legacy_files(bus); | |
204 | ||
205 | return retval; | |
206 | } | |
207 | ||
1da177e4 LT |
208 | /** |
209 | * pci_bus_add_devices - insert newly discovered PCI devices | |
210 | * @bus: bus to check for new devices | |
211 | * | |
212 | * Add newly discovered PCI devices (which are on the bus->devices | |
213 | * list) to the global PCI device list, add the sysfs and procfs | |
214 | * entries. Where a bridge is found, add the discovered bus to | |
215 | * the parents list of child buses, and recurse (breadth-first | |
216 | * to be compatible with 2.4) | |
217 | * | |
218 | * Call hotplug for each new devices. | |
219 | */ | |
c48f1670 | 220 | void pci_bus_add_devices(const struct pci_bus *bus) |
1da177e4 LT |
221 | { |
222 | struct pci_dev *dev; | |
3fa16fdb | 223 | struct pci_bus *child; |
b19441af | 224 | int retval; |
1da177e4 LT |
225 | |
226 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 GKH |
227 | /* Skip already-added devices */ |
228 | if (dev->is_added) | |
1da177e4 | 229 | continue; |
b19441af GKH |
230 | retval = pci_bus_add_device(dev); |
231 | if (retval) | |
232 | dev_err(&dev->dev, "Error adding device, continuing\n"); | |
1da177e4 LT |
233 | } |
234 | ||
235 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 | 236 | BUG_ON(!dev->is_added); |
1da177e4 | 237 | |
3fa16fdb | 238 | child = dev->subordinate; |
1da177e4 LT |
239 | /* |
240 | * If there is an unattached subordinate bus, attach | |
241 | * it and then scan for unattached PCI devices. | |
242 | */ | |
3fa16fdb YZ |
243 | if (!child) |
244 | continue; | |
245 | if (list_empty(&child->node)) { | |
246 | down_write(&pci_bus_sem); | |
247 | list_add_tail(&child->node, &dev->bus->children); | |
248 | up_write(&pci_bus_sem); | |
249 | } | |
250 | pci_bus_add_devices(child); | |
251 | ||
252 | /* | |
253 | * register the bus with sysfs as the parent is now | |
254 | * properly registered. | |
255 | */ | |
256 | if (child->is_added) | |
257 | continue; | |
876e501a | 258 | retval = pci_bus_add_child(child); |
3fa16fdb | 259 | if (retval) |
876e501a | 260 | dev_err(&dev->dev, "Error adding bus, continuing\n"); |
1da177e4 LT |
261 | } |
262 | } | |
263 | ||
264 | void pci_enable_bridges(struct pci_bus *bus) | |
265 | { | |
266 | struct pci_dev *dev; | |
95a62965 | 267 | int retval; |
1da177e4 LT |
268 | |
269 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
270 | if (dev->subordinate) { | |
296ccb08 | 271 | if (!pci_is_enabled(dev)) { |
9dd90caf | 272 | retval = pci_enable_device(dev); |
2eb5ebd3 JW |
273 | if (retval) |
274 | dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval); | |
9dd90caf AC |
275 | pci_set_master(dev); |
276 | } | |
1da177e4 LT |
277 | pci_enable_bridges(dev->subordinate); |
278 | } | |
279 | } | |
280 | } | |
281 | ||
cecf4864 PM |
282 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
283 | * @top bus whose devices should be walked | |
284 | * @cb callback to be called for each device found | |
285 | * @userdata arbitrary pointer to be passed to callback. | |
286 | * | |
287 | * Walk the given bus, including any bridged devices | |
288 | * on buses under this bus. Call the provided callback | |
289 | * on each device found. | |
70298c6e ZY |
290 | * |
291 | * We check the return of @cb each time. If it returns anything | |
292 | * other than 0, we break out. | |
293 | * | |
cecf4864 | 294 | */ |
70298c6e | 295 | void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), |
cecf4864 PM |
296 | void *userdata) |
297 | { | |
298 | struct pci_dev *dev; | |
299 | struct pci_bus *bus; | |
300 | struct list_head *next; | |
70298c6e | 301 | int retval; |
cecf4864 PM |
302 | |
303 | bus = top; | |
d71374da | 304 | down_read(&pci_bus_sem); |
cecf4864 PM |
305 | next = top->devices.next; |
306 | for (;;) { | |
307 | if (next == &bus->devices) { | |
308 | /* end of this bus, go up or finish */ | |
309 | if (bus == top) | |
310 | break; | |
311 | next = bus->self->bus_list.next; | |
312 | bus = bus->self->bus; | |
313 | continue; | |
314 | } | |
315 | dev = list_entry(next, struct pci_dev, bus_list); | |
cecf4864 PM |
316 | if (dev->subordinate) { |
317 | /* this is a pci-pci bridge, do its devices next */ | |
318 | next = dev->subordinate->devices.next; | |
319 | bus = dev->subordinate; | |
320 | } else | |
321 | next = dev->bus_list.next; | |
cecf4864 | 322 | |
d71374da | 323 | /* Run device routines with the device locked */ |
8e9394ce | 324 | device_lock(&dev->dev); |
70298c6e | 325 | retval = cb(dev, userdata); |
8e9394ce | 326 | device_unlock(&dev->dev); |
70298c6e ZY |
327 | if (retval) |
328 | break; | |
cecf4864 | 329 | } |
d71374da | 330 | up_read(&pci_bus_sem); |
cecf4864 | 331 | } |
7c94def8 | 332 | EXPORT_SYMBOL_GPL(pci_walk_bus); |
cecf4864 | 333 | |
1da177e4 LT |
334 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
335 | EXPORT_SYMBOL_GPL(pci_bus_add_device); | |
336 | EXPORT_SYMBOL(pci_bus_add_devices); | |
337 | EXPORT_SYMBOL(pci_enable_bridges); |