Commit | Line | Data |
---|---|---|
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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
1da177e4 LT |
17 | |
18 | #include "pci.h" | |
19 | ||
0efd5aab BH |
20 | void pci_add_resource_offset(struct list_head *resources, struct resource *res, |
21 | resource_size_t offset) | |
45ca9e97 | 22 | { |
0efd5aab | 23 | struct pci_host_bridge_window *window; |
45ca9e97 | 24 | |
0efd5aab BH |
25 | window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL); |
26 | if (!window) { | |
27 | printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res); | |
45ca9e97 BH |
28 | return; |
29 | } | |
30 | ||
0efd5aab BH |
31 | window->res = res; |
32 | window->offset = offset; | |
33 | list_add_tail(&window->list, resources); | |
34 | } | |
35 | EXPORT_SYMBOL(pci_add_resource_offset); | |
36 | ||
37 | void pci_add_resource(struct list_head *resources, struct resource *res) | |
38 | { | |
39 | pci_add_resource_offset(resources, res, 0); | |
45ca9e97 BH |
40 | } |
41 | EXPORT_SYMBOL(pci_add_resource); | |
42 | ||
43 | void pci_free_resource_list(struct list_head *resources) | |
44 | { | |
0efd5aab | 45 | struct pci_host_bridge_window *window, *tmp; |
45ca9e97 | 46 | |
0efd5aab BH |
47 | list_for_each_entry_safe(window, tmp, resources, list) { |
48 | list_del(&window->list); | |
49 | kfree(window); | |
45ca9e97 BH |
50 | } |
51 | } | |
52 | EXPORT_SYMBOL(pci_free_resource_list); | |
53 | ||
2fe2abf8 BH |
54 | void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, |
55 | unsigned int flags) | |
56 | { | |
57 | struct pci_bus_resource *bus_res; | |
58 | ||
59 | bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL); | |
60 | if (!bus_res) { | |
61 | dev_err(&bus->dev, "can't add %pR resource\n", res); | |
62 | return; | |
63 | } | |
64 | ||
65 | bus_res->res = res; | |
66 | bus_res->flags = flags; | |
67 | list_add_tail(&bus_res->list, &bus->resources); | |
68 | } | |
69 | ||
70 | struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n) | |
71 | { | |
72 | struct pci_bus_resource *bus_res; | |
73 | ||
74 | if (n < PCI_BRIDGE_RESOURCE_NUM) | |
75 | return bus->resource[n]; | |
76 | ||
77 | n -= PCI_BRIDGE_RESOURCE_NUM; | |
78 | list_for_each_entry(bus_res, &bus->resources, list) { | |
79 | if (n-- == 0) | |
80 | return bus_res->res; | |
81 | } | |
82 | return NULL; | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(pci_bus_resource_n); | |
85 | ||
86 | void pci_bus_remove_resources(struct pci_bus *bus) | |
87 | { | |
2fe2abf8 | 88 | int i; |
817a2685 | 89 | struct pci_bus_resource *bus_res, *tmp; |
2fe2abf8 BH |
90 | |
91 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) | |
7736a05a | 92 | bus->resource[i] = NULL; |
2fe2abf8 | 93 | |
817a2685 YL |
94 | list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) { |
95 | list_del(&bus_res->list); | |
96 | kfree(bus_res); | |
97 | } | |
2fe2abf8 BH |
98 | } |
99 | ||
f75b99d5 YL |
100 | static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL}; |
101 | #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT | |
102 | static struct pci_bus_region pci_64_bit = {0, | |
103 | (dma_addr_t) 0xffffffffffffffffULL}; | |
d56dbf5b YL |
104 | static struct pci_bus_region pci_high = {(dma_addr_t) 0x100000000ULL, |
105 | (dma_addr_t) 0xffffffffffffffffULL}; | |
f75b99d5 YL |
106 | #endif |
107 | ||
108 | /* | |
109 | * @res contains CPU addresses. Clip it so the corresponding bus addresses | |
110 | * on @bus are entirely within @region. This is used to control the bus | |
111 | * addresses of resources we allocate, e.g., we may need a resource that | |
112 | * can be mapped by a 32-bit BAR. | |
1da177e4 | 113 | */ |
f75b99d5 YL |
114 | static void pci_clip_resource_to_region(struct pci_bus *bus, |
115 | struct resource *res, | |
116 | struct pci_bus_region *region) | |
117 | { | |
118 | struct pci_bus_region r; | |
119 | ||
120 | pcibios_resource_to_bus(bus, &r, res); | |
121 | if (r.start < region->start) | |
122 | r.start = region->start; | |
123 | if (r.end > region->end) | |
124 | r.end = region->end; | |
125 | ||
126 | if (r.end < r.start) | |
127 | res->end = res->start - 1; | |
128 | else | |
129 | pcibios_bus_to_resource(bus, res, &r); | |
130 | } | |
131 | ||
132 | static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res, | |
e31dd6e4 | 133 | resource_size_t size, resource_size_t align, |
664c2848 | 134 | resource_size_t min, unsigned long type_mask, |
b26b2d49 | 135 | resource_size_t (*alignf)(void *, |
3b7a17fc | 136 | const struct resource *, |
b26b2d49 DB |
137 | resource_size_t, |
138 | resource_size_t), | |
f75b99d5 YL |
139 | void *alignf_data, |
140 | struct pci_bus_region *region) | |
1da177e4 | 141 | { |
f75b99d5 YL |
142 | int i, ret; |
143 | struct resource *r, avail; | |
144 | resource_size_t max; | |
1da177e4 | 145 | |
aa11fc58 | 146 | type_mask |= IORESOURCE_TYPE_BITS; |
1da177e4 | 147 | |
6db45b76 BH |
148 | pci_bus_for_each_resource(bus, r, i) { |
149 | if (!r) | |
150 | continue; | |
151 | ||
1da177e4 LT |
152 | /* type_mask must match */ |
153 | if ((res->flags ^ r->flags) & type_mask) | |
154 | continue; | |
155 | ||
156 | /* We cannot allocate a non-prefetching resource | |
157 | from a pre-fetching area */ | |
158 | if ((r->flags & IORESOURCE_PREFETCH) && | |
159 | !(res->flags & IORESOURCE_PREFETCH)) | |
160 | continue; | |
161 | ||
f75b99d5 YL |
162 | avail = *r; |
163 | pci_clip_resource_to_region(bus, &avail, region); | |
f75b99d5 | 164 | |
36e097a8 BH |
165 | /* |
166 | * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to | |
167 | * protect badly documented motherboard resources, but if | |
168 | * this is an already-configured bridge window, its start | |
169 | * overrides "min". | |
170 | */ | |
f75b99d5 YL |
171 | if (avail.start) |
172 | min = avail.start; | |
173 | ||
174 | max = avail.end; | |
36e097a8 | 175 | |
1da177e4 | 176 | /* Ok, try it out.. */ |
36e097a8 BH |
177 | ret = allocate_resource(r, res, size, min, max, |
178 | align, alignf, alignf_data); | |
1da177e4 | 179 | if (ret == 0) |
f75b99d5 | 180 | return 0; |
1da177e4 | 181 | } |
f75b99d5 YL |
182 | return -ENOMEM; |
183 | } | |
184 | ||
185 | /** | |
186 | * pci_bus_alloc_resource - allocate a resource from a parent bus | |
187 | * @bus: PCI bus | |
188 | * @res: resource to allocate | |
189 | * @size: size of resource to allocate | |
190 | * @align: alignment of resource to allocate | |
191 | * @min: minimum /proc/iomem address to allocate | |
192 | * @type_mask: IORESOURCE_* type flags | |
193 | * @alignf: resource alignment function | |
194 | * @alignf_data: data argument for resource alignment function | |
195 | * | |
196 | * Given the PCI bus a device resides on, the size, minimum address, | |
197 | * alignment and type, try to find an acceptable resource allocation | |
198 | * for a specific device resource. | |
199 | */ | |
d56dbf5b | 200 | int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, |
f75b99d5 | 201 | resource_size_t size, resource_size_t align, |
664c2848 | 202 | resource_size_t min, unsigned long type_mask, |
f75b99d5 YL |
203 | resource_size_t (*alignf)(void *, |
204 | const struct resource *, | |
205 | resource_size_t, | |
206 | resource_size_t), | |
207 | void *alignf_data) | |
208 | { | |
209 | #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT | |
d56dbf5b YL |
210 | int rc; |
211 | ||
212 | if (res->flags & IORESOURCE_MEM_64) { | |
213 | rc = pci_bus_alloc_from_region(bus, res, size, align, min, | |
214 | type_mask, alignf, alignf_data, | |
215 | &pci_high); | |
216 | if (rc == 0) | |
217 | return 0; | |
218 | ||
f75b99d5 YL |
219 | return pci_bus_alloc_from_region(bus, res, size, align, min, |
220 | type_mask, alignf, alignf_data, | |
221 | &pci_64_bit); | |
1da177e4 | 222 | } |
f75b99d5 YL |
223 | #endif |
224 | ||
225 | return pci_bus_alloc_from_region(bus, res, size, align, min, | |
226 | type_mask, alignf, alignf_data, | |
227 | &pci_32_bit); | |
1da177e4 | 228 | } |
b7fe9434 | 229 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
1da177e4 | 230 | |
3c449ed0 YL |
231 | void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { } |
232 | ||
1da177e4 | 233 | /** |
4f535093 | 234 | * pci_bus_add_device - start driver for a single device |
1da177e4 LT |
235 | * @dev: device to add |
236 | * | |
4f535093 | 237 | * This adds add sysfs entries and start device drivers |
1da177e4 | 238 | */ |
c893d133 | 239 | void pci_bus_add_device(struct pci_dev *dev) |
1da177e4 | 240 | { |
b19441af | 241 | int retval; |
735bff10 | 242 | |
4f535093 YL |
243 | /* |
244 | * Can not put in pci_device_add yet because resources | |
245 | * are not assigned yet for some devices. | |
246 | */ | |
e253aaf0 | 247 | pci_fixup_device(pci_fixup_final, dev); |
4f535093 | 248 | pci_create_sysfs_dev_files(dev); |
ef37702e | 249 | pci_proc_attach_device(dev); |
1da177e4 | 250 | |
58d9a38f YL |
251 | dev->match_driver = true; |
252 | retval = device_attach(&dev->dev); | |
253 | WARN_ON(retval < 0); | |
254 | ||
8a1bc901 | 255 | dev->is_added = 1; |
876e501a | 256 | } |
b7fe9434 | 257 | EXPORT_SYMBOL_GPL(pci_bus_add_device); |
876e501a | 258 | |
1da177e4 | 259 | /** |
4f535093 | 260 | * pci_bus_add_devices - start driver for PCI devices |
1da177e4 LT |
261 | * @bus: bus to check for new devices |
262 | * | |
4f535093 | 263 | * Start driver for PCI devices and add some sysfs entries. |
1da177e4 | 264 | */ |
c48f1670 | 265 | void pci_bus_add_devices(const struct pci_bus *bus) |
1da177e4 LT |
266 | { |
267 | struct pci_dev *dev; | |
3fa16fdb | 268 | struct pci_bus *child; |
1da177e4 LT |
269 | |
270 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 GKH |
271 | /* Skip already-added devices */ |
272 | if (dev->is_added) | |
1da177e4 | 273 | continue; |
c893d133 | 274 | pci_bus_add_device(dev); |
1da177e4 LT |
275 | } |
276 | ||
277 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 | 278 | BUG_ON(!dev->is_added); |
3fa16fdb | 279 | child = dev->subordinate; |
981cf9ea JL |
280 | if (child) |
281 | pci_bus_add_devices(child); | |
1da177e4 LT |
282 | } |
283 | } | |
b7fe9434 | 284 | EXPORT_SYMBOL(pci_bus_add_devices); |
1da177e4 | 285 | |
cecf4864 PM |
286 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
287 | * @top bus whose devices should be walked | |
288 | * @cb callback to be called for each device found | |
289 | * @userdata arbitrary pointer to be passed to callback. | |
290 | * | |
291 | * Walk the given bus, including any bridged devices | |
292 | * on buses under this bus. Call the provided callback | |
293 | * on each device found. | |
70298c6e ZY |
294 | * |
295 | * We check the return of @cb each time. If it returns anything | |
296 | * other than 0, we break out. | |
297 | * | |
cecf4864 | 298 | */ |
70298c6e | 299 | void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), |
cecf4864 PM |
300 | void *userdata) |
301 | { | |
302 | struct pci_dev *dev; | |
303 | struct pci_bus *bus; | |
304 | struct list_head *next; | |
70298c6e | 305 | int retval; |
cecf4864 PM |
306 | |
307 | bus = top; | |
d71374da | 308 | down_read(&pci_bus_sem); |
cecf4864 PM |
309 | next = top->devices.next; |
310 | for (;;) { | |
311 | if (next == &bus->devices) { | |
312 | /* end of this bus, go up or finish */ | |
313 | if (bus == top) | |
314 | break; | |
315 | next = bus->self->bus_list.next; | |
316 | bus = bus->self->bus; | |
317 | continue; | |
318 | } | |
319 | dev = list_entry(next, struct pci_dev, bus_list); | |
cecf4864 PM |
320 | if (dev->subordinate) { |
321 | /* this is a pci-pci bridge, do its devices next */ | |
322 | next = dev->subordinate->devices.next; | |
323 | bus = dev->subordinate; | |
324 | } else | |
325 | next = dev->bus_list.next; | |
cecf4864 | 326 | |
70298c6e | 327 | retval = cb(dev, userdata); |
70298c6e ZY |
328 | if (retval) |
329 | break; | |
cecf4864 | 330 | } |
d71374da | 331 | up_read(&pci_bus_sem); |
cecf4864 | 332 | } |
7c94def8 | 333 | EXPORT_SYMBOL_GPL(pci_walk_bus); |
cecf4864 | 334 | |
fe830ef6 JL |
335 | struct pci_bus *pci_bus_get(struct pci_bus *bus) |
336 | { | |
337 | if (bus) | |
338 | get_device(&bus->dev); | |
339 | return bus; | |
340 | } | |
341 | EXPORT_SYMBOL(pci_bus_get); | |
342 | ||
343 | void pci_bus_put(struct pci_bus *bus) | |
344 | { | |
345 | if (bus) | |
346 | put_device(&bus->dev); | |
347 | } | |
348 | EXPORT_SYMBOL(pci_bus_put); | |
349 |