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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/pci/bus.c | |
3 | * | |
4 | * From setup-res.c, by: | |
5 | * Dave Rusling ([email protected]) | |
6 | * David Mosberger ([email protected]) | |
7 | * David Miller ([email protected]) | |
8 | * Ivan Kokshaysky ([email protected]) | |
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 BH |
89 | int i; |
90 | ||
91 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) | |
7736a05a | 92 | bus->resource[i] = NULL; |
2fe2abf8 | 93 | |
45ca9e97 | 94 | pci_free_resource_list(&bus->resources); |
2fe2abf8 BH |
95 | } |
96 | ||
1da177e4 LT |
97 | /** |
98 | * pci_bus_alloc_resource - allocate a resource from a parent bus | |
99 | * @bus: PCI bus | |
100 | * @res: resource to allocate | |
101 | * @size: size of resource to allocate | |
102 | * @align: alignment of resource to allocate | |
103 | * @min: minimum /proc/iomem address to allocate | |
104 | * @type_mask: IORESOURCE_* type flags | |
105 | * @alignf: resource alignment function | |
106 | * @alignf_data: data argument for resource alignment function | |
107 | * | |
108 | * Given the PCI bus a device resides on, the size, minimum address, | |
109 | * alignment and type, try to find an acceptable resource allocation | |
110 | * for a specific device resource. | |
111 | */ | |
112 | int | |
113 | pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, | |
e31dd6e4 GKH |
114 | resource_size_t size, resource_size_t align, |
115 | resource_size_t min, unsigned int type_mask, | |
b26b2d49 | 116 | resource_size_t (*alignf)(void *, |
3b7a17fc | 117 | const struct resource *, |
b26b2d49 DB |
118 | resource_size_t, |
119 | resource_size_t), | |
e31dd6e4 | 120 | void *alignf_data) |
1da177e4 | 121 | { |
6db45b76 | 122 | int i, ret = -ENOMEM; |
89a74ecc | 123 | struct resource *r; |
1f82de10 | 124 | resource_size_t max = -1; |
1da177e4 LT |
125 | |
126 | type_mask |= IORESOURCE_IO | IORESOURCE_MEM; | |
127 | ||
1f82de10 YL |
128 | /* don't allocate too high if the pref mem doesn't support 64bit*/ |
129 | if (!(res->flags & IORESOURCE_MEM_64)) | |
130 | max = PCIBIOS_MAX_MEM_32; | |
131 | ||
6db45b76 BH |
132 | pci_bus_for_each_resource(bus, r, i) { |
133 | if (!r) | |
134 | continue; | |
135 | ||
1da177e4 LT |
136 | /* type_mask must match */ |
137 | if ((res->flags ^ r->flags) & type_mask) | |
138 | continue; | |
139 | ||
140 | /* We cannot allocate a non-prefetching resource | |
141 | from a pre-fetching area */ | |
142 | if ((r->flags & IORESOURCE_PREFETCH) && | |
143 | !(res->flags & IORESOURCE_PREFETCH)) | |
144 | continue; | |
145 | ||
146 | /* Ok, try it out.. */ | |
688d1918 LT |
147 | ret = allocate_resource(r, res, size, |
148 | r->start ? : min, | |
1f82de10 | 149 | max, align, |
1da177e4 LT |
150 | alignf, alignf_data); |
151 | if (ret == 0) | |
152 | break; | |
153 | } | |
154 | return ret; | |
155 | } | |
156 | ||
157 | /** | |
3fa16fdb | 158 | * pci_bus_add_device - add a single device |
1da177e4 LT |
159 | * @dev: device to add |
160 | * | |
161 | * This adds a single pci device to the global | |
162 | * device list and adds sysfs and procfs entries | |
163 | */ | |
96bde06a | 164 | int pci_bus_add_device(struct pci_dev *dev) |
1da177e4 | 165 | { |
b19441af GKH |
166 | int retval; |
167 | retval = device_add(&dev->dev); | |
168 | if (retval) | |
169 | return retval; | |
1da177e4 | 170 | |
8a1bc901 | 171 | dev->is_added = 1; |
1da177e4 LT |
172 | pci_proc_attach_device(dev); |
173 | pci_create_sysfs_dev_files(dev); | |
b19441af | 174 | return 0; |
1da177e4 LT |
175 | } |
176 | ||
876e501a YZ |
177 | /** |
178 | * pci_bus_add_child - add a child bus | |
179 | * @bus: bus to add | |
180 | * | |
181 | * This adds sysfs entries for a single bus | |
182 | */ | |
183 | int pci_bus_add_child(struct pci_bus *bus) | |
184 | { | |
185 | int retval; | |
186 | ||
187 | if (bus->bridge) | |
188 | bus->dev.parent = bus->bridge; | |
189 | ||
190 | retval = device_register(&bus->dev); | |
191 | if (retval) | |
192 | return retval; | |
193 | ||
194 | bus->is_added = 1; | |
195 | ||
876e501a YZ |
196 | /* Create legacy_io and legacy_mem files for this bus */ |
197 | pci_create_legacy_files(bus); | |
198 | ||
199 | return retval; | |
200 | } | |
201 | ||
1da177e4 LT |
202 | /** |
203 | * pci_bus_add_devices - insert newly discovered PCI devices | |
204 | * @bus: bus to check for new devices | |
205 | * | |
206 | * Add newly discovered PCI devices (which are on the bus->devices | |
207 | * list) to the global PCI device list, add the sysfs and procfs | |
208 | * entries. Where a bridge is found, add the discovered bus to | |
209 | * the parents list of child buses, and recurse (breadth-first | |
210 | * to be compatible with 2.4) | |
211 | * | |
212 | * Call hotplug for each new devices. | |
213 | */ | |
c48f1670 | 214 | void pci_bus_add_devices(const struct pci_bus *bus) |
1da177e4 LT |
215 | { |
216 | struct pci_dev *dev; | |
3fa16fdb | 217 | struct pci_bus *child; |
b19441af | 218 | int retval; |
1da177e4 LT |
219 | |
220 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 GKH |
221 | /* Skip already-added devices */ |
222 | if (dev->is_added) | |
1da177e4 | 223 | continue; |
b19441af GKH |
224 | retval = pci_bus_add_device(dev); |
225 | if (retval) | |
226 | dev_err(&dev->dev, "Error adding device, continuing\n"); | |
1da177e4 LT |
227 | } |
228 | ||
229 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 | 230 | BUG_ON(!dev->is_added); |
1da177e4 | 231 | |
3fa16fdb | 232 | child = dev->subordinate; |
1da177e4 LT |
233 | /* |
234 | * If there is an unattached subordinate bus, attach | |
235 | * it and then scan for unattached PCI devices. | |
236 | */ | |
3fa16fdb YZ |
237 | if (!child) |
238 | continue; | |
239 | if (list_empty(&child->node)) { | |
240 | down_write(&pci_bus_sem); | |
241 | list_add_tail(&child->node, &dev->bus->children); | |
242 | up_write(&pci_bus_sem); | |
243 | } | |
244 | pci_bus_add_devices(child); | |
245 | ||
246 | /* | |
247 | * register the bus with sysfs as the parent is now | |
248 | * properly registered. | |
249 | */ | |
250 | if (child->is_added) | |
251 | continue; | |
876e501a | 252 | retval = pci_bus_add_child(child); |
3fa16fdb | 253 | if (retval) |
876e501a | 254 | dev_err(&dev->dev, "Error adding bus, continuing\n"); |
1da177e4 LT |
255 | } |
256 | } | |
257 | ||
258 | void pci_enable_bridges(struct pci_bus *bus) | |
259 | { | |
260 | struct pci_dev *dev; | |
95a62965 | 261 | int retval; |
1da177e4 LT |
262 | |
263 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
264 | if (dev->subordinate) { | |
296ccb08 | 265 | if (!pci_is_enabled(dev)) { |
9dd90caf | 266 | retval = pci_enable_device(dev); |
2eb5ebd3 JW |
267 | if (retval) |
268 | dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval); | |
9dd90caf AC |
269 | pci_set_master(dev); |
270 | } | |
1da177e4 LT |
271 | pci_enable_bridges(dev->subordinate); |
272 | } | |
273 | } | |
274 | } | |
275 | ||
cecf4864 PM |
276 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
277 | * @top bus whose devices should be walked | |
278 | * @cb callback to be called for each device found | |
279 | * @userdata arbitrary pointer to be passed to callback. | |
280 | * | |
281 | * Walk the given bus, including any bridged devices | |
282 | * on buses under this bus. Call the provided callback | |
283 | * on each device found. | |
70298c6e ZY |
284 | * |
285 | * We check the return of @cb each time. If it returns anything | |
286 | * other than 0, we break out. | |
287 | * | |
cecf4864 | 288 | */ |
70298c6e | 289 | void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), |
cecf4864 PM |
290 | void *userdata) |
291 | { | |
292 | struct pci_dev *dev; | |
293 | struct pci_bus *bus; | |
294 | struct list_head *next; | |
70298c6e | 295 | int retval; |
cecf4864 PM |
296 | |
297 | bus = top; | |
d71374da | 298 | down_read(&pci_bus_sem); |
cecf4864 PM |
299 | next = top->devices.next; |
300 | for (;;) { | |
301 | if (next == &bus->devices) { | |
302 | /* end of this bus, go up or finish */ | |
303 | if (bus == top) | |
304 | break; | |
305 | next = bus->self->bus_list.next; | |
306 | bus = bus->self->bus; | |
307 | continue; | |
308 | } | |
309 | dev = list_entry(next, struct pci_dev, bus_list); | |
cecf4864 PM |
310 | if (dev->subordinate) { |
311 | /* this is a pci-pci bridge, do its devices next */ | |
312 | next = dev->subordinate->devices.next; | |
313 | bus = dev->subordinate; | |
314 | } else | |
315 | next = dev->bus_list.next; | |
cecf4864 | 316 | |
d71374da | 317 | /* Run device routines with the device locked */ |
8e9394ce | 318 | device_lock(&dev->dev); |
70298c6e | 319 | retval = cb(dev, userdata); |
8e9394ce | 320 | device_unlock(&dev->dev); |
70298c6e ZY |
321 | if (retval) |
322 | break; | |
cecf4864 | 323 | } |
d71374da | 324 | up_read(&pci_bus_sem); |
cecf4864 | 325 | } |
7c94def8 | 326 | EXPORT_SYMBOL_GPL(pci_walk_bus); |
cecf4864 | 327 | |
1da177e4 LT |
328 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
329 | EXPORT_SYMBOL_GPL(pci_bus_add_device); | |
330 | EXPORT_SYMBOL(pci_bus_add_devices); | |
331 | EXPORT_SYMBOL(pci_enable_bridges); |