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