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