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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 | ||
b126b470 BH |
67 | /* |
68 | * Find the highest-address bus resource below the cursor "res". If the | |
69 | * cursor is NULL, return the highest resource. | |
70 | */ | |
71 | static struct resource *pci_bus_find_resource_prev(struct pci_bus *bus, | |
72 | unsigned int type, | |
73 | struct resource *res) | |
74 | { | |
75 | struct resource *r, *prev = NULL; | |
76 | int i; | |
77 | ||
78 | pci_bus_for_each_resource(bus, r, i) { | |
79 | if (!r) | |
80 | continue; | |
81 | ||
82 | if ((r->flags & IORESOURCE_TYPE_BITS) != type) | |
83 | continue; | |
84 | ||
85 | /* If this resource is at or past the cursor, skip it */ | |
86 | if (res) { | |
87 | if (r == res) | |
88 | continue; | |
89 | if (r->end > res->end) | |
90 | continue; | |
91 | if (r->end == res->end && r->start > res->start) | |
92 | continue; | |
93 | } | |
94 | ||
95 | if (!prev) | |
96 | prev = r; | |
97 | ||
98 | /* | |
99 | * A small resource is higher than a large one that ends at | |
100 | * the same address. | |
101 | */ | |
102 | if (r->end > prev->end || | |
103 | (r->end == prev->end && r->start > prev->start)) | |
104 | prev = r; | |
105 | } | |
106 | ||
107 | return prev; | |
108 | } | |
109 | ||
1da177e4 LT |
110 | /** |
111 | * pci_bus_alloc_resource - allocate a resource from a parent bus | |
112 | * @bus: PCI bus | |
113 | * @res: resource to allocate | |
114 | * @size: size of resource to allocate | |
115 | * @align: alignment of resource to allocate | |
116 | * @min: minimum /proc/iomem address to allocate | |
117 | * @type_mask: IORESOURCE_* type flags | |
118 | * @alignf: resource alignment function | |
119 | * @alignf_data: data argument for resource alignment function | |
120 | * | |
121 | * Given the PCI bus a device resides on, the size, minimum address, | |
122 | * alignment and type, try to find an acceptable resource allocation | |
123 | * for a specific device resource. | |
124 | */ | |
125 | int | |
126 | pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, | |
e31dd6e4 GKH |
127 | resource_size_t size, resource_size_t align, |
128 | resource_size_t min, unsigned int type_mask, | |
b26b2d49 | 129 | resource_size_t (*alignf)(void *, |
3b7a17fc | 130 | const struct resource *, |
b26b2d49 DB |
131 | resource_size_t, |
132 | resource_size_t), | |
e31dd6e4 | 133 | void *alignf_data) |
1da177e4 | 134 | { |
b126b470 | 135 | int ret = -ENOMEM; |
89a74ecc | 136 | struct resource *r; |
1f82de10 | 137 | resource_size_t max = -1; |
b126b470 | 138 | unsigned int type = res->flags & IORESOURCE_TYPE_BITS; |
1da177e4 LT |
139 | |
140 | type_mask |= IORESOURCE_IO | IORESOURCE_MEM; | |
141 | ||
1f82de10 YL |
142 | /* don't allocate too high if the pref mem doesn't support 64bit*/ |
143 | if (!(res->flags & IORESOURCE_MEM_64)) | |
144 | max = PCIBIOS_MAX_MEM_32; | |
145 | ||
b126b470 BH |
146 | /* Look for space at highest addresses first */ |
147 | r = pci_bus_find_resource_prev(bus, type, NULL); | |
148 | for ( ; r; r = pci_bus_find_resource_prev(bus, type, r)) { | |
1da177e4 LT |
149 | /* type_mask must match */ |
150 | if ((res->flags ^ r->flags) & type_mask) | |
151 | continue; | |
152 | ||
153 | /* We cannot allocate a non-prefetching resource | |
154 | from a pre-fetching area */ | |
155 | if ((r->flags & IORESOURCE_PREFETCH) && | |
156 | !(res->flags & IORESOURCE_PREFETCH)) | |
157 | continue; | |
158 | ||
159 | /* Ok, try it out.. */ | |
688d1918 LT |
160 | ret = allocate_resource(r, res, size, |
161 | r->start ? : min, | |
1f82de10 | 162 | max, align, |
1da177e4 LT |
163 | alignf, alignf_data); |
164 | if (ret == 0) | |
165 | break; | |
166 | } | |
167 | return ret; | |
168 | } | |
169 | ||
170 | /** | |
3fa16fdb | 171 | * pci_bus_add_device - add a single device |
1da177e4 LT |
172 | * @dev: device to add |
173 | * | |
174 | * This adds a single pci device to the global | |
175 | * device list and adds sysfs and procfs entries | |
176 | */ | |
96bde06a | 177 | int pci_bus_add_device(struct pci_dev *dev) |
1da177e4 | 178 | { |
b19441af GKH |
179 | int retval; |
180 | retval = device_add(&dev->dev); | |
181 | if (retval) | |
182 | return retval; | |
1da177e4 | 183 | |
8a1bc901 | 184 | dev->is_added = 1; |
1da177e4 LT |
185 | pci_proc_attach_device(dev); |
186 | pci_create_sysfs_dev_files(dev); | |
b19441af | 187 | return 0; |
1da177e4 LT |
188 | } |
189 | ||
876e501a YZ |
190 | /** |
191 | * pci_bus_add_child - add a child bus | |
192 | * @bus: bus to add | |
193 | * | |
194 | * This adds sysfs entries for a single bus | |
195 | */ | |
196 | int pci_bus_add_child(struct pci_bus *bus) | |
197 | { | |
198 | int retval; | |
199 | ||
200 | if (bus->bridge) | |
201 | bus->dev.parent = bus->bridge; | |
202 | ||
203 | retval = device_register(&bus->dev); | |
204 | if (retval) | |
205 | return retval; | |
206 | ||
207 | bus->is_added = 1; | |
208 | ||
209 | retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity); | |
210 | if (retval) | |
211 | return retval; | |
212 | ||
213 | retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity); | |
214 | ||
215 | /* Create legacy_io and legacy_mem files for this bus */ | |
216 | pci_create_legacy_files(bus); | |
217 | ||
218 | return retval; | |
219 | } | |
220 | ||
1da177e4 LT |
221 | /** |
222 | * pci_bus_add_devices - insert newly discovered PCI devices | |
223 | * @bus: bus to check for new devices | |
224 | * | |
225 | * Add newly discovered PCI devices (which are on the bus->devices | |
226 | * list) to the global PCI device list, add the sysfs and procfs | |
227 | * entries. Where a bridge is found, add the discovered bus to | |
228 | * the parents list of child buses, and recurse (breadth-first | |
229 | * to be compatible with 2.4) | |
230 | * | |
231 | * Call hotplug for each new devices. | |
232 | */ | |
c48f1670 | 233 | void pci_bus_add_devices(const struct pci_bus *bus) |
1da177e4 LT |
234 | { |
235 | struct pci_dev *dev; | |
3fa16fdb | 236 | struct pci_bus *child; |
b19441af | 237 | int retval; |
1da177e4 LT |
238 | |
239 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 GKH |
240 | /* Skip already-added devices */ |
241 | if (dev->is_added) | |
1da177e4 | 242 | continue; |
b19441af GKH |
243 | retval = pci_bus_add_device(dev); |
244 | if (retval) | |
245 | dev_err(&dev->dev, "Error adding device, continuing\n"); | |
1da177e4 LT |
246 | } |
247 | ||
248 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 | 249 | BUG_ON(!dev->is_added); |
1da177e4 | 250 | |
3fa16fdb | 251 | child = dev->subordinate; |
1da177e4 LT |
252 | /* |
253 | * If there is an unattached subordinate bus, attach | |
254 | * it and then scan for unattached PCI devices. | |
255 | */ | |
3fa16fdb YZ |
256 | if (!child) |
257 | continue; | |
258 | if (list_empty(&child->node)) { | |
259 | down_write(&pci_bus_sem); | |
260 | list_add_tail(&child->node, &dev->bus->children); | |
261 | up_write(&pci_bus_sem); | |
262 | } | |
263 | pci_bus_add_devices(child); | |
264 | ||
265 | /* | |
266 | * register the bus with sysfs as the parent is now | |
267 | * properly registered. | |
268 | */ | |
269 | if (child->is_added) | |
270 | continue; | |
876e501a | 271 | retval = pci_bus_add_child(child); |
3fa16fdb | 272 | if (retval) |
876e501a | 273 | dev_err(&dev->dev, "Error adding bus, continuing\n"); |
1da177e4 LT |
274 | } |
275 | } | |
276 | ||
277 | void pci_enable_bridges(struct pci_bus *bus) | |
278 | { | |
279 | struct pci_dev *dev; | |
95a62965 | 280 | int retval; |
1da177e4 LT |
281 | |
282 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
283 | if (dev->subordinate) { | |
296ccb08 | 284 | if (!pci_is_enabled(dev)) { |
9dd90caf | 285 | retval = pci_enable_device(dev); |
2eb5ebd3 JW |
286 | if (retval) |
287 | dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval); | |
9dd90caf AC |
288 | pci_set_master(dev); |
289 | } | |
1da177e4 LT |
290 | pci_enable_bridges(dev->subordinate); |
291 | } | |
292 | } | |
293 | } | |
294 | ||
cecf4864 PM |
295 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
296 | * @top bus whose devices should be walked | |
297 | * @cb callback to be called for each device found | |
298 | * @userdata arbitrary pointer to be passed to callback. | |
299 | * | |
300 | * Walk the given bus, including any bridged devices | |
301 | * on buses under this bus. Call the provided callback | |
302 | * on each device found. | |
70298c6e ZY |
303 | * |
304 | * We check the return of @cb each time. If it returns anything | |
305 | * other than 0, we break out. | |
306 | * | |
cecf4864 | 307 | */ |
70298c6e | 308 | void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), |
cecf4864 PM |
309 | void *userdata) |
310 | { | |
311 | struct pci_dev *dev; | |
312 | struct pci_bus *bus; | |
313 | struct list_head *next; | |
70298c6e | 314 | int retval; |
cecf4864 PM |
315 | |
316 | bus = top; | |
d71374da | 317 | down_read(&pci_bus_sem); |
cecf4864 PM |
318 | next = top->devices.next; |
319 | for (;;) { | |
320 | if (next == &bus->devices) { | |
321 | /* end of this bus, go up or finish */ | |
322 | if (bus == top) | |
323 | break; | |
324 | next = bus->self->bus_list.next; | |
325 | bus = bus->self->bus; | |
326 | continue; | |
327 | } | |
328 | dev = list_entry(next, struct pci_dev, bus_list); | |
cecf4864 PM |
329 | if (dev->subordinate) { |
330 | /* this is a pci-pci bridge, do its devices next */ | |
331 | next = dev->subordinate->devices.next; | |
332 | bus = dev->subordinate; | |
333 | } else | |
334 | next = dev->bus_list.next; | |
cecf4864 | 335 | |
d71374da | 336 | /* Run device routines with the device locked */ |
8e9394ce | 337 | device_lock(&dev->dev); |
70298c6e | 338 | retval = cb(dev, userdata); |
8e9394ce | 339 | device_unlock(&dev->dev); |
70298c6e ZY |
340 | if (retval) |
341 | break; | |
cecf4864 | 342 | } |
d71374da | 343 | up_read(&pci_bus_sem); |
cecf4864 | 344 | } |
7c94def8 | 345 | EXPORT_SYMBOL_GPL(pci_walk_bus); |
cecf4864 | 346 | |
1da177e4 LT |
347 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
348 | EXPORT_SYMBOL_GPL(pci_bus_add_device); | |
349 | EXPORT_SYMBOL(pci_bus_add_devices); | |
350 | EXPORT_SYMBOL(pci_enable_bridges); |