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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 (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 | ||
f75b99d5 YL |
101 | static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL}; |
102 | #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT | |
103 | static struct pci_bus_region pci_64_bit = {0, | |
104 | (dma_addr_t) 0xffffffffffffffffULL}; | |
d56dbf5b YL |
105 | static struct pci_bus_region pci_high = {(dma_addr_t) 0x100000000ULL, |
106 | (dma_addr_t) 0xffffffffffffffffULL}; | |
f75b99d5 YL |
107 | #endif |
108 | ||
109 | /* | |
110 | * @res contains CPU addresses. Clip it so the corresponding bus addresses | |
111 | * on @bus are entirely within @region. This is used to control the bus | |
112 | * addresses of resources we allocate, e.g., we may need a resource that | |
113 | * can be mapped by a 32-bit BAR. | |
1da177e4 | 114 | */ |
f75b99d5 YL |
115 | static void pci_clip_resource_to_region(struct pci_bus *bus, |
116 | struct resource *res, | |
117 | struct pci_bus_region *region) | |
118 | { | |
119 | struct pci_bus_region r; | |
120 | ||
121 | pcibios_resource_to_bus(bus, &r, res); | |
122 | if (r.start < region->start) | |
123 | r.start = region->start; | |
124 | if (r.end > region->end) | |
125 | r.end = region->end; | |
126 | ||
127 | if (r.end < r.start) | |
128 | res->end = res->start - 1; | |
129 | else | |
130 | pcibios_bus_to_resource(bus, res, &r); | |
131 | } | |
132 | ||
133 | static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res, | |
e31dd6e4 GKH |
134 | resource_size_t size, resource_size_t align, |
135 | resource_size_t min, unsigned int type_mask, | |
b26b2d49 | 136 | resource_size_t (*alignf)(void *, |
3b7a17fc | 137 | const struct resource *, |
b26b2d49 DB |
138 | resource_size_t, |
139 | resource_size_t), | |
f75b99d5 YL |
140 | void *alignf_data, |
141 | struct pci_bus_region *region) | |
1da177e4 | 142 | { |
f75b99d5 YL |
143 | int i, ret; |
144 | struct resource *r, avail; | |
145 | resource_size_t max; | |
1da177e4 LT |
146 | |
147 | type_mask |= IORESOURCE_IO | IORESOURCE_MEM; | |
148 | ||
6db45b76 BH |
149 | pci_bus_for_each_resource(bus, r, i) { |
150 | if (!r) | |
151 | continue; | |
152 | ||
1da177e4 LT |
153 | /* type_mask must match */ |
154 | if ((res->flags ^ r->flags) & type_mask) | |
155 | continue; | |
156 | ||
157 | /* We cannot allocate a non-prefetching resource | |
158 | from a pre-fetching area */ | |
159 | if ((r->flags & IORESOURCE_PREFETCH) && | |
160 | !(res->flags & IORESOURCE_PREFETCH)) | |
161 | continue; | |
162 | ||
f75b99d5 YL |
163 | avail = *r; |
164 | pci_clip_resource_to_region(bus, &avail, region); | |
165 | if (!resource_size(&avail)) | |
166 | continue; | |
167 | ||
36e097a8 BH |
168 | /* |
169 | * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to | |
170 | * protect badly documented motherboard resources, but if | |
171 | * this is an already-configured bridge window, its start | |
172 | * overrides "min". | |
173 | */ | |
f75b99d5 YL |
174 | if (avail.start) |
175 | min = avail.start; | |
176 | ||
177 | max = avail.end; | |
36e097a8 | 178 | |
1da177e4 | 179 | /* Ok, try it out.. */ |
36e097a8 BH |
180 | ret = allocate_resource(r, res, size, min, max, |
181 | align, alignf, alignf_data); | |
1da177e4 | 182 | if (ret == 0) |
f75b99d5 | 183 | return 0; |
1da177e4 | 184 | } |
f75b99d5 YL |
185 | return -ENOMEM; |
186 | } | |
187 | ||
188 | /** | |
189 | * pci_bus_alloc_resource - allocate a resource from a parent bus | |
190 | * @bus: PCI bus | |
191 | * @res: resource to allocate | |
192 | * @size: size of resource to allocate | |
193 | * @align: alignment of resource to allocate | |
194 | * @min: minimum /proc/iomem address to allocate | |
195 | * @type_mask: IORESOURCE_* type flags | |
196 | * @alignf: resource alignment function | |
197 | * @alignf_data: data argument for resource alignment function | |
198 | * | |
199 | * Given the PCI bus a device resides on, the size, minimum address, | |
200 | * alignment and type, try to find an acceptable resource allocation | |
201 | * for a specific device resource. | |
202 | */ | |
d56dbf5b | 203 | int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, |
f75b99d5 YL |
204 | resource_size_t size, resource_size_t align, |
205 | resource_size_t min, unsigned int type_mask, | |
206 | resource_size_t (*alignf)(void *, | |
207 | const struct resource *, | |
208 | resource_size_t, | |
209 | resource_size_t), | |
210 | void *alignf_data) | |
211 | { | |
212 | #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT | |
d56dbf5b YL |
213 | int rc; |
214 | ||
215 | if (res->flags & IORESOURCE_MEM_64) { | |
216 | rc = pci_bus_alloc_from_region(bus, res, size, align, min, | |
217 | type_mask, alignf, alignf_data, | |
218 | &pci_high); | |
219 | if (rc == 0) | |
220 | return 0; | |
221 | ||
f75b99d5 YL |
222 | return pci_bus_alloc_from_region(bus, res, size, align, min, |
223 | type_mask, alignf, alignf_data, | |
224 | &pci_64_bit); | |
1da177e4 | 225 | } |
f75b99d5 YL |
226 | #endif |
227 | ||
228 | return pci_bus_alloc_from_region(bus, res, size, align, min, | |
229 | type_mask, alignf, alignf_data, | |
230 | &pci_32_bit); | |
1da177e4 LT |
231 | } |
232 | ||
3c449ed0 YL |
233 | void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { } |
234 | ||
1da177e4 | 235 | /** |
4f535093 | 236 | * pci_bus_add_device - start driver for a single device |
1da177e4 LT |
237 | * @dev: device to add |
238 | * | |
4f535093 | 239 | * This adds add sysfs entries and start device drivers |
1da177e4 | 240 | */ |
96bde06a | 241 | int pci_bus_add_device(struct pci_dev *dev) |
1da177e4 | 242 | { |
b19441af | 243 | int retval; |
735bff10 | 244 | |
4f535093 YL |
245 | /* |
246 | * Can not put in pci_device_add yet because resources | |
247 | * are not assigned yet for some devices. | |
248 | */ | |
e253aaf0 | 249 | pci_fixup_device(pci_fixup_final, dev); |
4f535093 | 250 | pci_create_sysfs_dev_files(dev); |
ef37702e | 251 | pci_proc_attach_device(dev); |
1da177e4 | 252 | |
58d9a38f YL |
253 | dev->match_driver = true; |
254 | retval = device_attach(&dev->dev); | |
255 | WARN_ON(retval < 0); | |
256 | ||
8a1bc901 | 257 | dev->is_added = 1; |
876e501a | 258 | |
4f535093 | 259 | return 0; |
876e501a YZ |
260 | } |
261 | ||
1da177e4 | 262 | /** |
4f535093 | 263 | * pci_bus_add_devices - start driver for PCI devices |
1da177e4 LT |
264 | * @bus: bus to check for new devices |
265 | * | |
4f535093 | 266 | * Start driver for PCI devices and add some sysfs entries. |
1da177e4 | 267 | */ |
c48f1670 | 268 | void pci_bus_add_devices(const struct pci_bus *bus) |
1da177e4 LT |
269 | { |
270 | struct pci_dev *dev; | |
3fa16fdb | 271 | struct pci_bus *child; |
b19441af | 272 | int retval; |
1da177e4 LT |
273 | |
274 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 GKH |
275 | /* Skip already-added devices */ |
276 | if (dev->is_added) | |
1da177e4 | 277 | continue; |
b19441af | 278 | retval = pci_bus_add_device(dev); |
9fc9eea0 BH |
279 | if (retval) |
280 | dev_err(&dev->dev, "Error adding device (%d)\n", | |
281 | retval); | |
1da177e4 LT |
282 | } |
283 | ||
284 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 | 285 | BUG_ON(!dev->is_added); |
3fa16fdb | 286 | child = dev->subordinate; |
981cf9ea JL |
287 | if (child) |
288 | pci_bus_add_devices(child); | |
1da177e4 LT |
289 | } |
290 | } | |
291 | ||
cecf4864 PM |
292 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
293 | * @top bus whose devices should be walked | |
294 | * @cb callback to be called for each device found | |
295 | * @userdata arbitrary pointer to be passed to callback. | |
296 | * | |
297 | * Walk the given bus, including any bridged devices | |
298 | * on buses under this bus. Call the provided callback | |
299 | * on each device found. | |
70298c6e ZY |
300 | * |
301 | * We check the return of @cb each time. If it returns anything | |
302 | * other than 0, we break out. | |
303 | * | |
cecf4864 | 304 | */ |
70298c6e | 305 | void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), |
cecf4864 PM |
306 | void *userdata) |
307 | { | |
308 | struct pci_dev *dev; | |
309 | struct pci_bus *bus; | |
310 | struct list_head *next; | |
70298c6e | 311 | int retval; |
cecf4864 PM |
312 | |
313 | bus = top; | |
d71374da | 314 | down_read(&pci_bus_sem); |
cecf4864 PM |
315 | next = top->devices.next; |
316 | for (;;) { | |
317 | if (next == &bus->devices) { | |
318 | /* end of this bus, go up or finish */ | |
319 | if (bus == top) | |
320 | break; | |
321 | next = bus->self->bus_list.next; | |
322 | bus = bus->self->bus; | |
323 | continue; | |
324 | } | |
325 | dev = list_entry(next, struct pci_dev, bus_list); | |
cecf4864 PM |
326 | if (dev->subordinate) { |
327 | /* this is a pci-pci bridge, do its devices next */ | |
328 | next = dev->subordinate->devices.next; | |
329 | bus = dev->subordinate; | |
330 | } else | |
331 | next = dev->bus_list.next; | |
cecf4864 | 332 | |
70298c6e | 333 | retval = cb(dev, userdata); |
70298c6e ZY |
334 | if (retval) |
335 | break; | |
cecf4864 | 336 | } |
d71374da | 337 | up_read(&pci_bus_sem); |
cecf4864 | 338 | } |
7c94def8 | 339 | EXPORT_SYMBOL_GPL(pci_walk_bus); |
cecf4864 | 340 | |
fe830ef6 JL |
341 | struct pci_bus *pci_bus_get(struct pci_bus *bus) |
342 | { | |
343 | if (bus) | |
344 | get_device(&bus->dev); | |
345 | return bus; | |
346 | } | |
347 | EXPORT_SYMBOL(pci_bus_get); | |
348 | ||
349 | void pci_bus_put(struct pci_bus *bus) | |
350 | { | |
351 | if (bus) | |
352 | put_device(&bus->dev); | |
353 | } | |
354 | EXPORT_SYMBOL(pci_bus_put); | |
355 | ||
1da177e4 LT |
356 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
357 | EXPORT_SYMBOL_GPL(pci_bus_add_device); | |
358 | EXPORT_SYMBOL(pci_bus_add_devices); |